TW201925294A - Oriented porous film - Google Patents

Abstract

This oriented porous film is made from a resin composition (Z) comprising a thermoplastic resin and an inorganic filler (A). The ratio tan[delta] (=E"/E') of loss modulus (E") to storage modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z), is at least 0.100 at a temperature of -20 DEG C, and porosity falls within the range of 25% to 80%.

Description

延伸多孔膜Extended porous membrane

本發明是有關於一種具有柔軟性與手感之類的優異觸感，並且抑制於膜的摩擦時所產生的不舒適的聲音的發生，通氣性、透濕性及強度亦優異的延伸多孔膜。更詳細而言，是有關於一種可適宜地用於紙尿布、女性用生理用品等衛生用品；工作服、套衫（jumper）、夾克（jacket）、醫療用衣服、化學防護衣等衣服；以及口罩（mask）、套子（cover）、帷幕（drapery）、床單（sheet）、圍巾（wrap）之類的要求通氣性、透濕性的用途中的、使用感優異的延伸多孔膜。The present invention relates to an elongated porous film which is excellent in air permeability, moisture permeability, and strength, and which is excellent in softness and texture, and which suppresses generation of uncomfortable sound generated when the film is rubbed. More specifically, it relates to a sanitary article which can be suitably used for a disposable diaper, a female physiological product, a work clothes, a jumper, a jacket, a medical garment, a chemical protective garment, and the like; An extended porous film excellent in the use feeling, such as a mask, a cover, a drapery, a sheet, a wrap, or the like, which is required for air permeability and moisture permeability.

先前，已知有一種藉由將含有聚烯烴系樹脂等熱塑性樹脂與無機填充材的樹脂組成物延伸而於熱塑性樹脂與無機填充材之間發生界面剝離並形成多個孔（微多孔）的多孔膜。特別是包含含有聚烯烴系樹脂與無機填充材的樹脂組成物的延伸多孔膜由於內部的微多孔形成為連通孔，因此被用作雖具有高透氣度及透濕度但抑制了液體透過的透濕防水膜，特別是廣泛用於紙尿布或女性用生理用品等衛生材料、工作服、套衫、夾克、醫療用衣服、化學防護衣等衣服、口罩、套子、帷幕、床單、圍巾等要求通氣性或透濕性的用途中。Conventionally, it has been known to form a plurality of pores (microporous) by interfacial peeling between a thermoplastic resin and an inorganic filler by stretching a resin composition containing a thermoplastic resin such as a polyolefin resin and an inorganic filler. membrane. In particular, the expanded porous film containing the resin composition containing the polyolefin-based resin and the inorganic filler is formed as a communication hole due to internal micropores, and thus is used as a moisture permeability which has high gas permeability and moisture permeability but inhibits liquid permeation. Waterproof film, especially for sanitary materials such as disposable diapers or female physiological products, overalls, pullovers, jackets, medical clothes, chemical protective clothing, etc., masks, covers, curtains, sheets, scarves, etc. For wet use.

該些用途中使用的多孔膜大多直接用於與人的皮膚接觸的用途中，因此，於穿著狀態下的活動中，膜具有沙沙、硬邦邦之類的不舒適的聲音或感觸這一情況成為妨礙使用感的主要原因。因此，對多孔膜要求手感或柔軟性良好，皮膚接觸良好，並且抑制不舒適聲音。Many of the porous membranes used in these applications are directly used for applications in contact with human skin. Therefore, in the event of wearing, the membrane has an uncomfortable sound or feeling such as rustling or hard state. The main reason for the sense of use. Therefore, the porous film is required to have a good hand feeling or softness, good skin contact, and suppress uncomfortable sound.

針對該些課題，例如揭示有一種相對於乙烯/α-烯烴共聚物65重量%～90重量%、熱塑性彈性體35重量%～10重量%的合計量100重量份而包含50重量份～300重量份的無機填充材的多孔性膜（專利文獻1）；或相對於如下的樹脂成分100重量份而包含無機填充材50重量份～400重量份的透濕膜（專利文獻2），所述樹脂成分100重量份包含含有12重量%以上的碳數為4個～8個的α-烯烴共聚單體的結晶性低密度聚乙烯20重量份～100重量份與聚乙烯80重量份～0重量份。In order to solve such problems, for example, 100 parts by weight to 90% by weight of the ethylene/α-olefin copolymer and 100 parts by weight to 10% by weight of the thermoplastic elastomer are contained in a total amount of 50 parts by weight to 300 parts by weight. a porous film of the inorganic filler (Patent Document 1); or a moisture-permeable film containing 50 parts by weight to 400 parts by weight of the inorganic filler in 100 parts by weight of the resin component (Patent Document 2), the resin 100 parts by weight of the component comprises 20 parts by weight to 100 parts by weight of the crystalline low-density polyethylene containing 12% by weight or more of the α-olefin comonomer having 4 to 8 carbon atoms, and 80 parts by weight to 0 parts by weight of the polyethylene. .

另外，分別揭示有一種相對於聚乙烯系樹脂30質量份～70質量份與烯烴系彈性體70質量份～30質量份的合計量100質量份而含有50質量份～300質量份的無機填充材、1質量份～30質量份的塑化劑的通氣性膜（專利文獻3）；或包含含有聚乙烯樹脂40質量份～90質量份、丙烯均聚物5質量份～30質量份、丙烯/乙烯共聚彈性體5質量份～30質量份的100質量份的樹脂成分、且相對於該樹脂成分而包含無機填充劑100質量份～200質量份、塑化劑1質量份～20質量份的透濕性膜（專利文獻4）；包含聚乙烯樹脂組成物與無機填充材及苯乙烯系彈性體的透濕性膜（專利文獻5）；進而揭示有一種含有包含直鏈狀低密度聚乙烯30質量份～85質量份、高壓聚合法低密度聚乙烯5質量份～20質量份、茂金屬系乙烯/α-烯烴共聚物10質量份～50質量份的樹脂成分、且相對於樹脂成分100質量份而含有100質量份～200質量份的無機填充劑與1質量份～20質量份的塑化劑的透濕性膜（專利文獻6）。In addition, it is disclosed that the inorganic filler is contained in an amount of 50 parts by mass to 300 parts by mass per 100 parts by mass to 70 parts by mass of the polyethylene-based resin and 100 parts by mass to 30 parts by mass of the olefin-based elastomer. 1 part by mass to 30 parts by mass of a gas permeable film of a plasticizer (Patent Document 3); or 40 parts by mass to 90 parts by mass of a polyethylene resin, 5 parts by mass to 30 parts by mass of a propylene homopolymer, and propylene/ 100 parts by mass of the resin component of the ethylene copolymer elastomer in an amount of 5 parts by mass to 30 parts by mass, and 100 parts by mass to 200 parts by mass of the inorganic filler and 1 part by mass to 20 parts by mass of the plasticizer are contained in the resin component. Wet film (Patent Document 4); a moisture-permeable film comprising a polyethylene resin composition, an inorganic filler, and a styrene elastomer (Patent Document 5); and further discloses a method comprising containing a linear low-density polyethylene 30 5 parts by mass of the high-pressure polymerization method, 5 parts by mass to 20 parts by mass of the high-pressure polymerization method, 10 parts by mass to 50 parts by mass of the metallocene-based ethylene/α-olefin copolymer, and 100 parts by mass of the resin component Contains 1 A moisture-permeable film of 00 parts by mass to 200 parts by mass of the inorganic filler and 1 part by mass to 20 parts by mass of the plasticizer (Patent Document 6).

進而，揭示有一種包含熱塑性樹脂、及填充劑1質量%～70質量%的、空孔率為80%以下的膜（專利文獻7）；或使用包含熱塑性樹脂、有機填充劑、無機填充劑的樹脂組成物的、空孔率為10%～80%的多孔膜（專利文獻8）。
[現有技術文獻]
[專利文獻]Further, a film containing a thermoplastic resin and a filler of 1% by mass to 70% by mass and having a porosity of 80% or less is disclosed (Patent Document 7); or a thermoplastic resin, an organic filler, or an inorganic filler is used. A porous film of a resin composition having a porosity of 10% to 80% (Patent Document 8).
[Prior Art Literature]
[Patent Literature]

專利文獻1：日本專利特開平7-228719號公報
專利文獻2：日本專利特開2000-1557號公報
專利文獻3：日本專利特開2017-31292號公報
專利文獻4：日本專利特開2015-229720號公報
專利文獻5：國際公開2014/088065號
專利文獻6：國際公開2015/186808號
專利文獻7：國際公開2014/156952號
專利文獻8：日本專利特開2006-117816號公報[Patent Document 1] Japanese Patent Laid-Open No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Patent Document 5: International Publication No. 2014/088065 Patent Document 6: International Publication No. 2015/186808 Patent Document 7: International Publication No. 2014/156952 Patent Document 8: Japanese Patent Laid-Open No. 2006-117816

[發明所欲解決之課題]
但是，專利文獻1、專利文獻2中由於是一種熔點為60℃～100℃的乙烯/α-烯烴共聚物或含有12重量%以上的碳數為4個～8個的α-烯烴共聚單體的結晶性低密度聚乙烯成為主成分的膜，因此，雖富有柔軟性，但於貼合其他構件的步驟等中產生的高溫條件下有熔融之虞，尺寸穩定性或耐熱性等變得不充分。[Problems to be solved by the invention]
However, in Patent Document 1 and Patent Document 2, an ethylene/α-olefin copolymer having a melting point of 60° C. to 100° C. or an α-olefin comonomer having a carbon number of 4 to 8 or more containing 12% by weight or more is contained. Since the crystalline low-density polyethylene is a film of a main component, it is flexible, but it melts under high-temperature conditions occurring in a step of bonding other members, etc., and dimensional stability or heat resistance does not become. full.

另外，專利文獻3～專利文獻6中，藉由在含有聚乙烯系樹脂與無機填充材的組成物中含有烯烴系彈性體、丙烯/乙烯共聚彈性體、苯乙烯系彈性體、茂金屬系乙烯/α-烯烴共聚物等軟質樹脂，從而具有柔軟性或伸縮性，藉此獲得手感或觸感優異的膜。
另一方面，於使用該些多孔膜的用途中，要求進一步提升使用感，因此需要柔軟性或手感等觸感的進一步改良、或抑制於膜的摩擦時所產生的不舒適的聲音的發生等。然而，專利文獻3～專利文獻6中，未提及與不舒適聲音的抑制有關的技術性設計指南。Further, in Patent Document 3 to Patent Document 6, an olefin-based elastomer, a propylene/ethylene copolymer elastomer, a styrene-based elastomer, or a metallocene-based ethylene is contained in a composition containing a polyethylene resin and an inorganic filler. A soft resin such as an α-olefin copolymer has flexibility or stretchability, thereby obtaining a film excellent in hand or touch.
On the other hand, in the use of the porous film, it is required to further improve the feeling of use. Therefore, it is necessary to further improve the touch feeling such as softness or hand feeling, or to suppress the occurrence of uncomfortable sound generated when the film is rubbed. . However, in Patent Documents 3 to 6, there is no mention of a technical design guide relating to suppression of uncomfortable sound.

另外，專利文獻7中記載有，於主要以聚乳酸系樹脂為代表的生物分解性樹脂中含有填充劑，並嘗試了兼顧耐水性與分解性兩者，藉由將空孔率設為80%以下而抑制膜的耐水性不足，但關於不舒適聲音的控制，並未提及。另外，專利文獻8中亦記載有，藉由將空孔率設為10%～80%而抑制透濕度、膜強度、保溫效果、防塵效果的下降，但同樣地，關於不舒適聲音的抑制，並未提及。In addition, in the biodegradable resin mainly represented by a polylactic acid-based resin, a filler is contained in the patent document 7, and both the water resistance and the decomposability are considered, and the porosity is set to 80%. In the following, the water resistance of the film was insufficient, but the control of the uncomfortable sound was not mentioned. Further, in Patent Document 8, it is described that the moisture permeability, the film strength, the heat insulating effect, and the dustproof effect are suppressed by setting the porosity to 10% to 80%. However, similarly, regarding the suppression of uncomfortable sound, Not mentioned.

本發明是鑒於所述課題而完成的，在於提供一種具有柔軟性與手感之類的優異觸感，並且抑制於膜的摩擦時所產生的不舒適的聲音的發生，通氣性、透濕性及強度亦優異的延伸多孔膜。
[解決課題之手段]The present invention has been made in view of the above problems, and it is an object of providing an excellent tactile sensation such as flexibility and hand feeling, and suppressing the occurrence of uncomfortable sound generated during friction of a film, air permeability, moisture permeability, and An elongated porous film excellent in strength.
[Means for solving the problem]

本發明者等人進行了努力研究，結果成功獲得可解決所述現有技術的課題的延伸多孔膜，從而完成了本發明。即，本發明的目的是藉由以下的延伸多孔膜（以下，亦稱作「本發明的延伸多孔膜」。）而達成。As a result of intensive studies, the inventors of the present invention have succeeded in obtaining an elongated porous film which can solve the problems of the prior art, and have completed the present invention. In other words, the object of the present invention is achieved by the following expanded porous film (hereinafter also referred to as "the stretched porous film of the present invention").

即，本發明的課題可藉由如下的延伸多孔膜（本發明的第1實施形態）來解決，其包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且所述樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，空孔率為25%～80%。In other words, the problem of the present invention can be solved by the expanded porous film (the first embodiment of the present invention) comprising a resin composition (Z) containing a thermoplastic resin and an inorganic filler (A), and the resin The ratio of the storage elastic modulus (E') calculated according to the dynamic viscoelasticity measurement of the composition (Z) to the loss elastic modulus (E''), that is, tan δ (=E''/E') is 0.100 at -20 ° C. Above, the porosity is 25% to 80%.

另外，本發明的課題可藉由如下的延伸多孔膜（本發明的第2實施形態）來解決，其包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且所述樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，於140℃～200℃下具有結晶熔融峰值（Pm1）。
[發明的效果]Further, the problem of the present invention can be solved by the following expanded porous film (the second embodiment of the present invention) comprising a resin composition (Z) containing a thermoplastic resin and an inorganic filler (A), and the resin The ratio of the storage elastic modulus (E') calculated according to the dynamic viscoelasticity measurement of the composition (Z) to the loss elastic modulus (E''), that is, tan δ (=E''/E') is 0.100 at -20 ° C. The above has a crystal melting peak (Pm1) at 140 ° C to 200 ° C.
[Effects of the Invention]

根據本發明，可獲得一種具有柔軟性與手感之類的優異觸感，並且抑制於膜的摩擦時所產生的不舒適的聲音的發生，通氣性、透濕性及強度亦優異的延伸多孔膜，因此可適宜地用於要求通氣性或透濕性的用途中。According to the present invention, it is possible to obtain an extended porous film which is excellent in air permeability, moisture permeability and strength, and which is excellent in softness and texture, and which suppresses generation of uncomfortable sound generated when the film is rubbed. Therefore, it can be suitably used for applications requiring air permeability or moisture permeability.

以下，對作為本發明的實施形態的一例的、本發明的延伸多孔膜進行說明。其中，本發明的範圍並不限定於以下說明的實施形態。此處，所謂延伸多孔膜，為至少於單軸方向上經延伸的多孔膜。Hereinafter, the expanded porous film of the present invention which is an example of the embodiment of the present invention will be described. However, the scope of the present invention is not limited to the embodiments described below. Here, the extended porous film is a porous film that extends at least in the uniaxial direction.

再者，本說明書中，所謂「主成分」，是指於構成的組成物中佔最多質量比率的成分，較佳為45質量%以上，更佳為50質量%以上，進而佳為55質量%以上。另外，於記載為「X～Y」（X、Y為任意數字）的情況下，只要無特別說明，則包含「X以上且Y以下」的含義，並且包含「較佳為大於X」及「較佳為小於Y」的含義。In the present specification, the term "main component" means a component which accounts for the most mass ratio in the constituent composition, and is preferably 45 mass% or more, more preferably 50 mass% or more, and further preferably 55 mass%. the above. In addition, when it is described as "X to Y" (X, Y is an arbitrary number), unless otherwise specified, the meaning of "X or more and Y or less" is included, and "preferably greater than X" and " It is preferably less than the meaning of Y".

1. 延伸多孔膜
1-1. 延伸多孔膜（本發明的第1實施形態）
本發明的第1實施形態的延伸多孔膜為如下的延伸多孔膜，其包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且該樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，空孔率為25%～80%。Extended porous membrane
1-1. Extended porous film (first embodiment of the present invention)
The expanded porous film according to the first embodiment of the present invention is an expanded porous film comprising a resin composition (Z) containing a thermoplastic resin or an inorganic filler (A), and the resin composition (Z) is dynamically adhered. The ratio of the storage elastic modulus (E') and the loss elastic modulus (E'') calculated by the elastic measurement, that is, tan δ (=E''/E') is 0.100 or more at -20 ° C, and the porosity is 25%. 80%.

本發明的第1實施形態的延伸多孔膜較佳為包含含有25質量%～54質量%的熱塑性樹脂、46質量%～75質量%的無機填充材（A）的樹脂組成物（Z）。因而，本發明的第1實施形態的延伸多孔膜更佳為如下的延伸多孔膜，其包含含有25質量%～54質量%的熱塑性樹脂、46質量%～75質量%的無機填充材（A）的樹脂組成物（Z），且該樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，空孔率為25%～80%。The expanded porous film of the first embodiment of the present invention preferably contains a resin composition (Z) containing 25% by mass to 54% by mass of a thermoplastic resin and 46% by mass to 75% by mass of the inorganic filler (A). Therefore, the expanded porous film of the first embodiment of the present invention is more preferably an expanded porous film containing 25% by mass to 54% by mass of a thermoplastic resin and 46% by mass to 75% by mass of an inorganic filler (A). The resin composition (Z), and the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity of the resin composition (Z) to the loss elastic modulus (E'') is tan δ (=E'' /E') is 0.100 or more at -20 ° C, and the porosity is 25% to 80%.

本發明的第1實施形態的延伸多孔膜重要的是，構成延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，較佳為0.110以上，更佳為0.120以上，進而佳為0.130以上。另外，關於構成延伸多孔膜的樹脂組成物（Z）的tanδ的上限，並無特別限制，但就耐熱性或尺寸穩定性的觀點而言，較佳為於-20℃下為1.000以下。藉由tanδ（=E''/E'）於-20℃下為0.100以上，如後述般，可提高用以抑制於膜摩擦時所產生的不舒適聲音的吸音係數（振動衰減率），且成為柔軟性或手感之類的觸感優異的膜。The expanded porous film according to the first embodiment of the present invention is important in the storage elastic modulus (E') and the loss elastic modulus (E'' calculated from the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film. The ratio of tan δ (=E''/E') is 0.100 or more at -20 ° C, preferably 0.110 or more, more preferably 0.120 or more, and still more preferably 0.130 or more. In addition, the upper limit of tan δ of the resin composition (Z) constituting the expanded porous film is not particularly limited, but from the viewpoint of heat resistance and dimensional stability, it is preferably 1.000 or less at -20 °C. By tan δ (=E''/E'), it is 0.100 or more at -20 ° C, and as described later, the sound absorption coefficient (vibration attenuation rate) for suppressing the uncomfortable sound generated when the film is rubbed can be improved, and A film that is excellent in touch such as softness or texture.

所述tanδ較佳為於-20℃～-10℃下為0.100以上，更佳為於-20℃～0℃下為0.100以上，進而佳為於-20℃～10℃下為0.100以上，進而更佳為於-20℃～20℃下為0.100以上，最佳為於-30℃～30℃下為0.100以上。藉由構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ成為0.100以上的溫度範圍變寬，如後述般，可抑制各種頻率的不舒適聲音。The tan δ is preferably 0.100 or more at -20 ° C to -10 ° C, more preferably 0.100 or more at -20 ° C to 0 ° C, and more preferably 0.100 or more at -20 ° C to 10 ° C. More preferably, it is 0.100 or more at -20 ° C to 20 ° C, and most preferably 0.100 or more at -30 ° C to 30 ° C. The temperature range in which the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film of the first embodiment of the present invention is 0.100 or more is widened, and as will be described later, various frequencies can be suppressed. Comfortable sound.

進而，本發明的第1實施形態的延伸多孔膜的空孔率重要的是為25%～80%。空孔率更佳為30%～80%，進而佳為35%～80%。
於空孔率為25%以上的情況下，如後述般，於延伸多孔膜的空隙中傳播的聲音的能量損失機會增多，可充分抑制不舒適聲音。另外，於空孔率為80%以下的情況下，可確保實際可使用的程度的膜強度，進而防水性變得充分，不易引起所接觸的液狀物的洩漏。Further, the porosity of the expanded porous film according to the first embodiment of the present invention is preferably 25% to 80%. The porosity is preferably from 30% to 80%, and more preferably from 35% to 80%.
When the porosity is 25% or more, as will be described later, the chance of energy loss of sound propagating in the gap of the extended porous film is increased, and the uncomfortable sound can be sufficiently suppressed. In addition, when the porosity is 80% or less, the film strength to the extent that it can be practically used can be ensured, and the water repellency can be made sufficiently insufficient to cause leakage of the liquid material to be contacted.

聲音是物體移動、或摩擦時所產生的空氣的振動波。於聲音作為入射音撞擊於物體的情況下，自能量守恆定律的關係來看，所述入射音分解為透過物體的透過音、反射物體的反射音、以及被物體吸收的吸收音這三個聲音。即，當入射音撞擊至物體時，若被物體吸收的吸收音的比例大，則認為該物體為吸音係數高的物體。
本發明的第1實施形態的延伸多孔膜為具有連通至樹脂組成物（Z）內部的空隙的膜。即，於本發明的第1實施形態的延伸多孔膜中傳播聲音的情況下，表示使作為膜而形成固體部的樹脂組成物（Z）振動並傳播的聲音、與在形成於膜內部的連通的空隙中傳播的聲音這兩個傳播方式。因此，為了抑制聲音，必須考慮抑制使樹脂組成物（Z）振動並傳播的聲音、以及抑制於連通的空隙中傳播的聲音。The sound is the vibration wave of the air generated when the object moves or rubs. In the case where the sound hits the object as an incident sound, the incident sound is decomposed into three sounds: a transmitted sound transmitted through the object, a reflected sound of the reflected object, and an absorbed sound absorbed by the object, in terms of the relationship of the law of conservation of energy. . That is, when the incident sound hits the object, if the proportion of the absorbed sound absorbed by the object is large, the object is considered to be an object having a high sound absorption coefficient.
The expanded porous film according to the first embodiment of the present invention is a film having a void that communicates with the inside of the resin composition (Z). In other words, when the sound is propagated in the expanded porous film according to the first embodiment of the present invention, the sound of the resin composition (Z) which forms a solid portion as a film is vibrated and propagated, and the communication is formed in the inside of the film. The two sounds of the sound that propagate in the gap. Therefore, in order to suppress the sound, it is necessary to suppress the sound which vibrates and propagates the resin composition (Z) and the sound which propagates in the communicating gap.

為了抑制本發明的第1實施形態的延伸多孔膜中的使樹脂組成物（Z）振動並傳播的聲音，認為有效的是聲音於振動源或介質中的衰減。於如樹脂般的黏彈性體中，藉由使振動能損失為熱能而獲得吸音效果。因而，認為儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ成為為了表現出所述吸音效果而需要的要素。因此，於本發明的第1實施形態中，構成延伸多孔膜的樹脂組成物（Z）的tanδ的峰值較佳為大。
另外，構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的tanδ的峰值位置與聲音於產生環境溫度下的衰減相關，並且就溫度-時間換算法則的觀點而言，亦與相對於頻率而言的衰減相關。因此，為了吸收具有各種頻率的不舒適聲音或者不使其產生，tanδ的峰值寬度較佳為寬。
因而，構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上對於抑制在膜的摩擦時所產生的不舒適聲音的發生而言是重要的。如所述般，tanδ成為0.100以上的溫度範圍變寬由於能夠抑制各種頻率的不舒適的聲音，因此較佳。In order to suppress the sound which vibrates and propagates the resin composition (Z) in the expanded porous film of the first embodiment of the present invention, it is considered that the sound is attenuated by the sound in the vibration source or the medium. In a resin-like viscoelastic body, a sound absorbing effect is obtained by making vibration energy loss into heat energy. Therefore, it is considered that tan δ, which is a ratio of the storage elastic modulus (E') to the loss elastic coefficient (E''), is an element required to exhibit the sound absorbing effect. Therefore, in the first embodiment of the present invention, the peak value of tan δ of the resin composition (Z) constituting the expanded porous film is preferably large.
In addition, the peak position of tan δ of the resin composition (Z) constituting the expanded porous film of the first embodiment of the present invention is related to the attenuation of the sound at the ambient temperature, and also from the viewpoint of the temperature-time conversion algorithm. Correlated with attenuation with respect to frequency. Therefore, in order to absorb or not generate an uncomfortable sound having various frequencies, the peak width of tan δ is preferably wide.
Therefore, the ratio of the storage elastic modulus (E') and the loss elastic modulus (E'') calculated by the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film according to the first embodiment of the present invention is tan δ. (=E''/E') of 0.100 or more at -20 ° C is important for suppressing the occurrence of uncomfortable sound generated when the film is rubbed. As described above, it is preferable that the temperature range in which tan δ is 0.100 or more is widened, since it is possible to suppress uncomfortable sound at various frequencies.

進而，於本發明的第1實施形態中發現，不僅儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ，而且多孔膜的空孔率亦大大有助於抑制所傳播的聲音。藉由空孔率增加，於空氣中傳播的聲音與物體的撞擊次數增加，因此認為獲得了抑制在形成於膜內部的連通的空隙中傳播的聲音的效果。
因而，為了使於膜的空隙中傳播的聲音的能量損失機會增多，重要的是延伸多孔膜的空孔率為25%以上。Further, in the first embodiment of the present invention, it was found that not only the tan δ which is the ratio of the elastic modulus (E') to the loss elastic modulus (E'') but also the porosity of the porous film is greatly contributed to suppressing the propagation. the sound of. Since the number of collisions between the sound propagating in the air and the object is increased by the increase in the porosity, it is considered that the effect of suppressing the sound propagating in the communicating gap formed inside the film is obtained.
Therefore, in order to increase the chance of energy loss of sound propagating in the voids of the film, it is important that the porosity of the elongated porous film is 25% or more.

總結以上，本發明的第1實施形態中，藉由將樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ、以及膜的空孔率設為適當範圍，不僅柔軟性或手感之類的觸感優異，而且能夠提高用以抑制於膜摩擦時所產生的不舒適聲音的吸音係數（振動衰減率）。In the first embodiment of the present invention, the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) to the loss elastic modulus (E'') is tan δ. In addition, the porosity of the film is set to an appropriate range, and not only the touch feeling such as softness or hand feeling is excellent, but also the sound absorption coefficient (vibration attenuation rate) for suppressing the uncomfortable sound generated when the film is rubbed can be improved.

另外，本發明的第1實施形態的延伸多孔膜的結晶熔融焓（ΔHm）較佳為10 J/g～45 J/g。另外，所述結晶熔融焓（ΔHm）更佳為12 J/g～43 J/g，進而佳為14 J/g～41 J/g，進而更佳為16 J/g～39 J/g。藉由所述結晶熔融焓（ΔHm）成為10 J/g以上，可確保延伸多孔膜的耐熱性或尺寸穩定性。另外，藉由所述結晶熔融焓（ΔHm）成為45 J/g以下，可抑制後述不舒適聲音的產生。Further, the expanded porous film of the first embodiment of the present invention preferably has a crystal melting enthalpy (ΔHm) of 10 J/g to 45 J/g. Further, the crystal melting enthalpy (?Hm) is more preferably from 12 J/g to 43 J/g, still more preferably from 14 J/g to 41 J/g, still more preferably from 16 J/g to 39 J/g. When the crystal melting enthalpy (ΔHm) is 10 J/g or more, heat resistance or dimensional stability of the expanded porous film can be ensured. In addition, when the crystal melting enthalpy (ΔHm) is 45 J/g or less, generation of an uncomfortable sound described later can be suppressed.

作為抑制使延伸多孔膜相互摩擦時所產生的不舒適聲音的方法，認為有效的是抑制所述傳播音，並且抑制自聲源產生聲音。聲音的產生是彈性體的振動，只要不存在引起振動者（=聲源），則不會產生聲音。
若著眼於構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）中所包含的熱塑性樹脂，則熱塑性樹脂為具有彈性性質與黏性性質兩者的黏彈性體。即，藉由減少熱塑性樹脂的彈性性質的比例，當賦予使膜相互摩擦的外力時，排斥該外力並振動的彈性成分減少，聲音的產生得到抑制。表示彈性性質與黏性性質的比例的指標為所述tanδ，但認為就宏觀視角與微觀視角而言減少所述彈性性質的比例對於減少不舒適聲音是有效的。所謂宏觀視角的彈性性質，是指所述構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'），所謂微觀視角的彈性性質，是指後述樹脂的結晶成分。As a method of suppressing an uncomfortable sound generated when the elongated porous film is rubbed against each other, it is considered effective to suppress the propagation sound and suppress generation of sound from the sound source. The generation of sound is the vibration of the elastic body, and as long as there is no vibration (= sound source), no sound is produced.
When the thermoplastic resin contained in the resin composition (Z) of the expanded porous film of the first embodiment of the present invention is focused on, the thermoplastic resin is a viscoelastic body having both an elastic property and a viscous property. That is, by reducing the ratio of the elastic properties of the thermoplastic resin, when an external force that causes the films to rub against each other is imparted, the elastic component that repels the external force and vibrates is reduced, and the generation of sound is suppressed. An index indicating the ratio of the elastic property to the viscous property is the tan δ, but it is considered that reducing the ratio of the elastic property in terms of the macroscopic angle of view and the microscopic viewing angle is effective for reducing uncomfortable sound. The elastic property of the macroscopic viewing angle is the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film according to the first embodiment of the present invention, and the so-called microscopic viewing angle. The elastic property refers to the crystalline component of the resin described later.

就結晶的觀點而言，熱塑性樹脂分類為非晶性樹脂與結晶性樹脂。非晶性樹脂為由於分子鏈具有體積比較大的結構，因此分子鏈無法有序地折疊，且不具有結晶部分的熱塑性樹脂。另一方面，結晶性樹脂為分子鏈有序地折疊、且於內部具有密度高的結晶部分的熱塑性樹脂。其中，即便是結晶性樹脂，亦不存在分子鏈100%結晶化的結晶性樹脂，具有分子鏈隨機排列的非晶部與分子鏈有序地折疊的結晶部兩者。
結晶性樹脂的非晶部於玻璃轉移溫度（Tg）以上的溫度範圍內可進行微布朗（micro-brownian）運動，並處於移動率（mobility）高的狀態。另一方面，結晶性樹脂的結晶部於玻璃轉移溫度（Tg）以上且熔點（Tm）以下的溫度範圍內，分子鏈作為結晶而受到限制，並成為彈性係數非常高的部位。因此，於結晶性樹脂的結晶化度低的情況下，彈性係數高的結晶部減少，因此認為賦予外力時排斥並振動的成分少，所產生的聲音亦變小。因而，結晶熔融焓（ΔHm）成為本發明的第1實施形態的延伸多孔膜中的結晶成分比例的指標，且較佳為10 J/g～45 J/g。From the viewpoint of crystallization, thermoplastic resins are classified into amorphous resins and crystalline resins. The amorphous resin is a thermoplastic resin which does not have a crystalline portion because the molecular chain has a relatively large volume structure, so that the molecular chain cannot be folded in an orderly manner. On the other hand, the crystalline resin is a thermoplastic resin in which molecular chains are sequentially folded and has a crystal portion having a high density inside. Among them, even in the case of the crystalline resin, there is no crystalline resin in which the molecular chain is 100% crystallized, and both the amorphous portion in which the molecular chains are randomly arranged and the crystal portion in which the molecular chains are sequentially folded are formed.
The amorphous portion of the crystalline resin can undergo micro-brownian motion in a temperature range of not less than the glass transition temperature (Tg), and is in a state of high mobility. On the other hand, in the crystal portion of the crystalline resin, the molecular chain is restricted as a crystal in a temperature range of not less than the glass transition temperature (Tg) and a melting point (Tm) or less, and is a site having a very high elastic modulus. Therefore, when the degree of crystallization of the crystalline resin is low, the crystal portion having a high elastic modulus is reduced. Therefore, it is considered that the amount of components which are repelled and vibrated when an external force is applied is small, and the generated sound is also small. Therefore, the crystal melting enthalpy (?Hm) is an index of the ratio of the crystal components in the expanded porous film of the first embodiment of the present invention, and is preferably 10 J/g to 45 J/g.

構成延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）較佳為於20℃下為8.0×10⁸ Pa以下。更佳為7.0×10⁸ Pa以下，進而佳為6.0×10⁸ Pa以下。於儲存彈性係數（E'）於20℃下為8.0×10⁸ Pa以下的情況下，延伸多孔膜成為手感或柔軟性之類的觸感優異者。另外，關於下限，並無特別限定，但就延伸多孔膜的處理（handling）的觀點而言，較佳為於20℃下為1.0×10⁷ Pa以上。The storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film is preferably 8.0 × 10 ⁸ Pa or less at 20 °C. More preferably, it is 7.0 × 10 ⁸ Pa or less, and further preferably 6.0 × 10 ⁸ Pa or less. When the storage elastic modulus (E') is 8.0 × 10 ⁸ Pa or less at 20 ° C, the stretched porous film is excellent in touch such as hand or softness. Further, the lower limit is not particularly limited, but from the viewpoint of handling of the extended porous film, it is preferably 1.0 × 10 ⁷ Pa or more at 20 °C.

構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的動態黏彈性測定是將剪裁為寬4 mm、長35 mm的長條狀的樣品片以測定頻率10 Hz、測定應變0.1%、夾頭間距離25 mm一面自測定溫度-100℃起以升溫速度3℃/min進行升溫一面進行測定。此時，根據所獲得的動態黏彈性的溫度依存性剖面圖（profile）而算出各溫度下的儲存彈性係數（E'）、損失彈性係數（E''）、及儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）。
再者，關於動態黏彈性測定，預先測定樣品片的厚度，並將樣品片的厚度與樣品片的寬度值輸入至測定裝置中，藉此計算樣品片的剖面積，並算出各值。
本發明的第1實施形態的延伸多孔膜於樹脂組成物（Z）中產生有空隙，因此於直接測定多孔體的情況下，所算出的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ容易產生誤差。因此，為了獲得本發明的第1實施形態所規定的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ，較佳為對使用構成延伸多孔膜的樹脂組成物（Z）的未延伸膜並剪裁為縱向（機械方向（machine direction，MD））：4 mm、橫向（transverse direction，TD）：35 mm的長條狀的樣品片進行動態黏彈性測定。但是，藉由將延伸多孔膜加熱為熔點以上而將膜熔融並使空孔消失後，製作壓製樣品（press sample），自該壓製樣品剪裁長條狀的樣品片並進行動態黏彈性測定，藉此亦能夠算出本發明的第1實施形態所規定的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ。本發明中，任一測定方法均可採用。The dynamic viscoelasticity of the resin composition (Z) constituting the expanded porous film of the first embodiment of the present invention is measured by measuring a strain at a measurement frequency of 10 Hz by cutting a strip sample having a width of 4 mm and a length of 35 mm. 0.1% and a distance of 25 mm between the chucks were measured while the temperature was raised at a temperature increase rate of 3 ° C/min from the measurement temperature of -100 °C. At this time, the storage elastic modulus (E'), the loss elastic modulus (E''), and the storage elastic coefficient (E') at each temperature are calculated from the temperature dependence profile of the obtained dynamic viscoelasticity. The ratio to the loss elastic coefficient (E'') is tan δ (=E''/E').
Further, regarding the dynamic viscoelasticity measurement, the thickness of the sample piece is measured in advance, and the thickness of the sample piece and the width value of the sample piece are input to the measuring device, whereby the cross-sectional area of the sample piece is calculated, and each value is calculated.
In the expanded porous film according to the first embodiment of the present invention, voids are generated in the resin composition (Z). Therefore, when the porous body is directly measured, the calculated storage elastic modulus (E') and the loss elastic modulus (E' are calculated. '), and tan δ are prone to errors. Therefore, in order to obtain the storage elastic modulus (E'), the loss elastic modulus (E''), and tan δ prescribed in the first embodiment of the present invention, it is preferable to use the resin composition (Z) constituting the elongated porous film. The unstretched film was cut into a longitudinal (machine direction (MD)): 4 mm, transverse direction (TD): 35 mm long strips for dynamic viscoelasticity measurements. However, by heating the expanded porous film to a melting point or higher and melting the film and eliminating voids, a press sample is prepared, and a long sample piece is cut from the pressed sample and subjected to dynamic viscoelasticity measurement. This also makes it possible to calculate the storage elastic modulus (E'), the loss elastic modulus (E''), and tan δ defined in the first embodiment of the present invention. In the present invention, any of the measurement methods can be employed.

此處，關於空孔率，將延伸多孔膜剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行延伸多孔膜的比重（W1）的測定。繼而，對構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）的比重（W0）進行測定。於所述樹脂組成物（Z）的比重（W0）的測定中，可將本發明的第1實施形態的延伸多孔膜的未延伸膜剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行比重測定。另外，於難以採取未延伸片材的情況下，將本發明的第1實施形態的延伸多孔膜加熱為熔點以上，藉此將延伸多孔膜熔融並使空孔消失後，製作壓製樣品，自該壓製樣品剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行比重測定。
所述延伸多孔膜的比重（W1）及所述樹脂組成物（Z）的比重（W0）的測定是隨機測定3點並使用其算術平均值。根據所獲得的所述延伸多孔膜的比重（W1）及所述樹脂組成物（Z）的比重（W0）並藉由下式來算出空孔率。

空孔率（%）=[1-（W1/W0）]×100Here, regarding the porosity, the elongated porous film was cut into a longitudinal direction (MD): 50 mm, a lateral direction (TD): 50 mm, and the specific gravity (W1) of the expanded porous film was measured. Then, the specific gravity (W0) of the resin composition (Z) constituting the expanded porous film of the first embodiment of the present invention was measured. In the measurement of the specific gravity (W0) of the resin composition (Z), the unstretched film of the expanded porous film of the first embodiment of the present invention can be cut into the machine direction (MD): 50 mm and the transverse direction (TD): The size of 50 mm was measured for specific gravity. In addition, when it is difficult to take the unstretched sheet, the expanded porous film of the first embodiment of the present invention is heated to a melting point or higher, whereby the expanded porous film is melted and the pores are eliminated, and then a pressed sample is produced. The pressed sample was cut into a machine direction (MD): 50 mm, lateral (TD): 50 mm and subjected to specific gravity measurement.
The specific gravity (W1) of the expanded porous film and the specific gravity (W0) of the resin composition (Z) were measured at three points at random and the arithmetic mean thereof was used. The porosity was calculated from the specific gravity (W1) of the obtained expanded porous film and the specific gravity (W0) of the resin composition (Z) by the following formula.

Porosity (%) = [1-(W1/W0)] × 100

另外，關於本發明的第1實施形態的延伸多孔膜的結晶熔融焓（ΔHm），利用示差掃描型熱量計（Differential Scanning Calorimeter，DSC）將本發明的第1實施形態的延伸多孔膜以加熱速度10℃/分鐘自-40℃升溫至高溫保持溫度後，保持1分鐘，繼而以冷卻速度10℃/分鐘自高溫保持溫度降溫至-40℃後，保持1分鐘，進而以加熱速度10℃/分鐘自-40℃再升溫至所述高溫保持溫度，根據此時的結晶熔融峰值面積來算出結晶熔融焓（ΔHm）。此時，所述高溫保持溫度相對於所使用的熱塑性樹脂的結晶熔融峰值溫度（Tm），可於Tm+20℃以上且Tm+150℃以下的範圍內任意地選擇。
再者，本發明的第1實施形態所規定的結晶熔融焓（ΔHm）即便於所述再升溫過程中發生如在半結晶性樹脂中所看到的冷結晶化的情況下，亦應用根據再升溫過程中所產生的結晶熔融峰值而算出的ΔHm。即，不自再升溫過程中所獲得的ΔHm中減去根據再升溫過程中所產生的冷結晶化中的發熱峰值面積而算出的結晶化焓（ΔHc）。
進而，於將本發明的第1實施形態的延伸多孔膜與其他層積層的情況下，若對積層體直接進行DSC測定，則有估計源於所述延伸多孔膜的ΔHm低之虞。因此，於本發明的第1實施形態的延伸多孔膜為積層體的情況下，可將本發明的第1實施形態的延伸多孔膜剝離，並對該多孔層測定ΔHm。於難以剝離的情況下，藉由DSC測定來算出積層體整體的本發明的第1實施形態的延伸多孔膜的ΔHm，並且算出積層體整體的所述多孔層的積層比，藉由以下的計算式可算出本發明的第1實施形態所規定的ΔHm。再者，積層比的算出並無特別限定，但較佳為藉由利用光學顯微鏡、電子顯微鏡等進行的剖面觀察來算出。

本發明的第1實施形態所規定的ΔHm（J/g）=積層體整體的延伸多孔膜的ΔHm（J/g）/積層體整體的所述多孔層的積層比（%）/100（%）In the crystal melting enthalpy (ΔHm) of the expanded porous film according to the first embodiment of the present invention, the elongated porous film of the first embodiment of the present invention is heated at a heating rate by a differential scanning calorimeter (DSC). After heating from -40 ° C to a high temperature holding temperature at 10 ° C / min, hold for 1 minute, then keep the temperature from -40 ° C at a cooling rate of 10 ° C / min, hold for 1 minute, and then heat at 10 ° C / min. The temperature was further raised from -40 ° C to the high temperature holding temperature, and crystal melting enthalpy (ΔHm) was calculated from the crystal melting peak area at this time. In this case, the high-temperature holding temperature can be arbitrarily selected within a range of Tm + 20 ° C or more and Tm + 150 ° C or less with respect to the crystal melting peak temperature (Tm) of the thermoplastic resin to be used.
Further, the crystal melting enthalpy (ΔHm) defined in the first embodiment of the present invention is applied in the case of cold crystallization as seen in the semi-crystalline resin during the reheating process. ΔHm calculated by the peak of crystal melting generated during the temperature rise. In other words, the crystallization enthalpy (ΔHc) calculated based on the area of the heat generation peak in the cold crystallization which is generated during the reheating process is not subtracted from ΔHm obtained during the temperature increase.
Further, when the expanded porous film of the first embodiment of the present invention is laminated with another layer, if the laminated body is directly subjected to DSC measurement, it is estimated that the ΔHm derived from the expanded porous film is low. Therefore, when the expanded porous film of the first embodiment of the present invention is a laminate, the expanded porous film of the first embodiment of the present invention can be peeled off, and ΔHm can be measured for the porous layer. In the case where it is difficult to remove, the ΔHm of the expanded porous film of the first embodiment of the present invention, which is the entire laminated body, is calculated by DSC measurement, and the laminated ratio of the porous layer of the entire laminated body is calculated, and the following calculation is performed. The formula can calculate ΔHm defined by the first embodiment of the present invention. In addition, the calculation of the laminated ratio is not particularly limited, but is preferably calculated by cross-sectional observation by an optical microscope, an electron microscope, or the like.

ΔHm (J/g) defined in the first embodiment of the present invention = ΔHm (J/g) of the expanded porous film of the entire laminated body / laminated ratio (%) of the porous layer of the entire laminated body / 100 (%) )

另外，本發明的第1實施形態的延伸多孔膜中的結晶熔融峰值溫度（Tm）較佳為70℃以上，更佳為80℃以上，進而佳為90℃以上。另外，結晶熔融峰值可為一個，亦可為兩個以上。於結晶熔融峰值為兩個以上的情況下，較佳為其中一個結晶熔融峰值溫度（Tm）為70℃以上。進而，於結晶熔融峰值有兩個以上的情況下，結晶熔融焓（ΔHm）成為根據兩個以上的結晶熔融峰值而算出的結晶熔融焓（ΔHm）的合計值。
另外，於構成本發明的第1實施形態的延伸多孔膜的樹脂組成物（Z）中所包含的熱塑性樹脂為聚烯烴系樹脂的情況下，結晶熔融起始溫度自較結晶熔融峰值溫度（Tm）低30℃以上的溫度起一點點熔融，且大多表示寬峰。因此，對於示差掃描型熱量測定（Differential Scanning Calorimetry，DSC），藉由自-40℃起升溫，可明確基線，並算出更準確的結晶熔融焓（ΔHm）。In addition, the crystal melting peak temperature (Tm) in the expanded porous film of the first embodiment of the present invention is preferably 70 ° C or higher, more preferably 80 ° C or higher, and still more preferably 90 ° C or higher. Further, the crystal melting peak may be one or two or more. In the case where the crystal melting peak is two or more, it is preferred that one of the crystal melting peak temperatures (Tm) is 70 ° C or higher. In addition, when there are two or more crystal melting peaks, the crystal melting enthalpy (ΔHm) is a total value of crystal melting enthalpy (ΔHm) calculated from two or more crystal melting peaks.
In the case where the thermoplastic resin contained in the resin composition (Z) of the expanded porous film of the first embodiment of the present invention is a polyolefin resin, the crystal melting initiation temperature is higher than the crystal melting peak temperature (Tm). The temperature lower than 30 ° C is slightly melted, and most of them indicate a broad peak. Therefore, for Differential Scanning Calorimetry (DSC), the temperature is raised from -40 ° C, and the baseline can be confirmed, and a more accurate crystal melting enthalpy (ΔHm) can be calculated.

本發明的第1實施形態的延伸多孔膜中的基重較佳為10 g/m² ~50 g/m² ，更佳為15 g/m² ~40 g/m² 。藉由基重為10 g/m² 以上，容易充分確保拉伸強度、撕裂強度等機械強度。另外，藉由基重為50 g/m² 以下，容易獲得充分的輕量感。
此處，關於基重，利用電子天平測定樣品（縱向（MD）：250 mm、橫向（TD）：200 mm）的質量（g），並將使該數值乘以20倍所得的值作為基重。The basis weight in the expanded porous film according to the first embodiment of the present invention is preferably from 10 g/m ² to 50 g/m ² , more preferably from 15 g/m ² to 40 g/m ² . By having a basis weight of 10 g/m ² or more, it is easy to sufficiently ensure mechanical strength such as tensile strength and tear strength. Further, by having a basis weight of 50 g/m ² or less, it is easy to obtain a sufficient light weight.
Here, regarding the basis weight, the mass (g) of the sample (longitudinal (MD): 250 mm, lateral direction (TD): 200 mm) was measured using an electronic balance, and the value obtained by multiplying the value by 20 times was used as the basis weight. .

本發明的第1實施形態的延伸多孔膜中的透氣度較佳為1秒/100 mL～5000秒/100 mL，更佳為10秒/100 mL～4000秒/100 mL，進而佳為100秒/100 mL～3000秒/100 mL。藉由透氣度為1秒/100 mL以上，容易充分確保耐水性及耐透液性。另外，藉由透氣度為5000秒/100 mL以下，暗示具有充分的連通孔。
此處，透氣度是依據由日本工業標準（Japanese Industrial Standards，JIS）P8117：2009（哥雷（Gurley）試驗機法）規定的方法測定的100 mL的空氣通過紙片的秒數，例如可使用透氣度測定裝置（旭精工製造的王研式透氣度測定機EGO1-55型）來測定。本發明中，對樣品隨機測定10點，並將其算術平均值作為透氣度。The gas permeability in the expanded porous film according to the first embodiment of the present invention is preferably from 1 second/100 mL to 5000 seconds/100 mL, more preferably from 10 seconds/100 mL to 4000 seconds/100 mL, and further preferably 100 seconds. /100 mL to 3000 seconds / 100 mL. By having a gas permeability of 1 second/100 mL or more, it is easy to sufficiently ensure water resistance and liquid permeability resistance. Further, by having a gas permeability of 5000 sec/100 mL or less, it is suggested that there is a sufficient communication hole.
Here, the air permeability is the number of seconds in which 100 mL of air passes through the sheet of paper measured according to the method specified by Japanese Industrial Standards (JIS) P8117:2009 (Gurley Test Machine Method), for example, ventilation can be used. The measurement device (Model EGO1-55 manufactured by Asahi Seiko Co., Ltd.) was used for measurement. In the present invention, the sample is randomly measured at 10 points, and its arithmetic mean is taken as the air permeability.

本發明的第1實施形態的延伸多孔膜中的透濕度較佳為1000 g/（m² ·24h）～15000 g/（m² ·24h），更佳為1500 g/（m² ·24h）～12000 g/（m² ·24h）。藉由透濕度為15000 g/（m² ·24h）以下，暗示具有耐水性。另外，藉由透濕度為1000 g/（m² ·24h）以上，暗示空孔具有充分的連通性。
此處，透濕度依據JIS Z0208（防濕包裝材料的透濕度試驗方法（杯法（cup method）））的各條件。使用15 g氯化鈣作為吸濕劑，並於溫度40℃、相對濕度90%的恆溫恆濕環境下進行測定。對樣品隨機測定2點，並求出其算術平均值。The moisture permeability in the expanded porous film according to the first embodiment of the present invention is preferably from 1000 g/(m ² ·24 h) to 15,000 g/(m ² ·24 h), more preferably 1500 g/(m ² ·24 h). ~12000 g / (m ² · 24h). By having a moisture permeability of 15,000 g/(m ² ·24h) or less, it is suggested to have water resistance. Further, by the moisture permeability of 1000 g/(m ² ·24h) or more, it is suggested that the pores have sufficient connectivity.
Here, the moisture permeability is in accordance with each condition of JIS Z0208 (the moisture absorption test method (cup method) of the moisture-proof packaging material). 15 g of calcium chloride was used as a moisture absorbent, and the measurement was carried out in a constant temperature and humidity environment at a temperature of 40 ° C and a relative humidity of 90%. The sample was randomly measured at 2 points and the arithmetic mean was obtained.

本發明的第1實施形態的延伸多孔膜中的延伸方向的拉伸斷裂強度較佳為7 N/25 mm以上，更佳為10 N/25 mm以上。藉由所述拉伸斷裂強度為7 N/25 mm以上，可確保實用上充分的機械強度與柔軟性。另外，關於上限，並無特別限定，但若鑒於延伸性，則較佳為35 N/25 mm以下。此處，關於延伸方向的拉伸斷裂強度，為依據JIS K7127製作剪裁為延伸方向100 mm×與延伸方向垂直的方向25 mm的樣品，並於23℃、相對濕度50%的環境下，於拉伸速度200 m/min、夾頭間距離50 mm的條件下使用三連式拉伸試驗機使其斷裂時的拉伸斷裂強度。本發明中，設為進行3次測定而算出的拉伸斷裂強度的算術平均值。The tensile strength at break in the extending direction of the expanded porous film according to the first embodiment of the present invention is preferably 7 N/25 mm or more, and more preferably 10 N/25 mm or more. By the tensile breaking strength of 7 N/25 mm or more, practically sufficient mechanical strength and flexibility can be ensured. Further, the upper limit is not particularly limited, but is preferably 35 N/25 mm or less in view of the elongation. Here, the tensile breaking strength in the extending direction is a sample which is cut to a direction of 100 mm in the extending direction and perpendicular to the extending direction in accordance with JIS K7127, and is pulled at 23 ° C and a relative humidity of 50%. The tensile strength at break when the tensile speed was 200 m/min and the distance between the chucks was 50 mm using a three-joint tensile tester. In the present invention, the arithmetic mean value of the tensile breaking strength calculated by performing three measurements is used.

本發明的第1實施形態的延伸多孔膜中的延伸方向的拉伸斷裂伸長率較佳為40%~400%，更佳為100%~300%。若拉伸斷裂伸長率為40%以上，則於將本發明的延伸多孔膜用於紙尿布、及生理處理用品等的透濕防水用後片材（back sheet）等衛生用品中的情況下，皮膚接觸良好，可獲得優異的穿著舒適性。另外，若拉伸斷裂伸長率為400%以下，則具有適度的剛性與抗張力，機械特性優異，於印刷、開縫（slit）、以及捲取加工時膜的伸長率及應變小，從而獲得生產線中的優異的機械適應性。
此處，關於延伸方向的拉伸斷裂伸長率，為依據JIS K7127製作剪裁為延伸方向100 mm×與延伸方向垂直的方向25 mm的樣品，並於23℃、相對濕度50%的環境下，於拉伸速度200 m/min、夾頭間距離50 mm的條件下使用三連式拉伸試驗機使其斷裂時的拉伸斷裂伸長率。本發明中，設為進行3次測定而算出的拉伸斷裂伸長率的算術平均值。The tensile elongation at break in the extending direction of the expanded porous film according to the first embodiment of the present invention is preferably from 40% to 400%, more preferably from 100% to 300%. When the stretched elongation at break is 40% or more, the stretched porous film of the present invention is used in sanitary articles such as a disposable diaper and a back sheet such as a sanitary napkin. Good skin contact for excellent wearing comfort. In addition, when the tensile elongation at break is 400% or less, it has moderate rigidity and tensile strength, and is excellent in mechanical properties, and the elongation and strain of the film during printing, slitting, and coiling are small, thereby obtaining a production line. Excellent mechanical adaptability.
Here, the tensile elongation at break in the extending direction is a sample which is cut into a direction of 100 mm in the extending direction and perpendicular to the extending direction in accordance with JIS K7127, and is in an environment of 23 ° C and a relative humidity of 50%. Tensile elongation at break when the tensile speed was 200 m/min and the distance between the chucks was 50 mm using a three-joint tensile tester. In the present invention, the arithmetic mean value of the tensile elongation at break calculated by performing three measurements is used.

於60℃下將本發明的第1實施形態的延伸多孔膜加熱1小時時的延伸方向的熱收縮率較佳為未滿5.0%，更佳為未滿4.0%。藉由在60℃下加熱1小時時的延伸方向上的熱收縮率未滿5.0%，對延伸多孔膜的輥狀樣品進行經時保管時的結塊（blocking）或捲繞少，從而較佳。
此處，關於熱收縮率，為將剪裁為延伸方向200 mm×與延伸方向垂直的方向10 mm的樣品於設定為槽內溫度60℃的對流烘箱中靜置加熱1小時。然後，測定延伸方向的長度L（mm），並藉由式「（200-L）/200×100（%）」而算出的值。本發明中，設為進行3次測定而算出的熱收縮率的算術平均值。The heat shrinkage rate in the extending direction when the expanded porous film of the first embodiment of the present invention is heated at 60 ° C for 1 hour is preferably less than 5.0%, more preferably less than 4.0%. When the heat shrinkage rate in the extending direction at the time of heating at 60 ° C for 1 hour is less than 5.0%, it is preferable that the roll-shaped sample of the stretched porous film is less likely to be blocked or wound during storage over time. .
Here, regarding the heat shrinkage rate, a sample cut to a direction of 200 mm in the extending direction of 200 mm × perpendicular to the extending direction was allowed to stand for 1 hour in a convection oven set to a bath temperature of 60 ° C. Then, the length L (mm) in the extending direction was measured, and the value calculated by the formula "(200-L) / 200 × 100 (%)" was used. In the present invention, the arithmetic mean value of the heat shrinkage ratio calculated by performing three measurements is used.

本發明的第1實施形態的延伸多孔膜中的總光線透過率較佳為18%～60%。藉由總光線透過率為18%以上，於將本發明的第1實施形態的延伸多孔膜用於紙尿布等的透濕防水用後片材等衛生用品中的情況下，即便塗佈通知已排尿的指示藥劑亦能夠識別。另外，藉由總光線透過率為60%以下，而膜是白色的，且富有隱蔽性。
此處，關於總光線透過率，使用依據JIS K7361的霧度計，隨機測定5點，並求出其算術平均值。The total light transmittance in the elongated porous film of the first embodiment of the present invention is preferably from 18% to 60%. In the case where the extended porous film of the first embodiment of the present invention is used for a sanitary article such as a moisture permeable waterproof sheet such as a disposable diaper, the total light transmittance is 18% or more. The indicator agent for urination can also be identified. Further, since the total light transmittance is 60% or less, the film is white and concealed.
Here, regarding the total light transmittance, 5 points were randomly measured using a haze meter according to JIS K7361, and the arithmetic mean value thereof was obtained.

以下，對本發明的膜的另一實施形態進行說明。Hereinafter, another embodiment of the film of the present invention will be described.

1-2. 延伸多孔膜（本發明的第2實施形態）
本發明的第2實施形態的延伸多孔膜為如下的延伸多孔膜，其包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且該樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，於140℃～200℃下具有結晶熔融峰值（Pm1）。1-2. Extended porous film (second embodiment of the present invention)
The expanded porous film according to the second embodiment of the present invention is an extended porous film comprising a resin composition (Z) containing a thermoplastic resin or an inorganic filler (A), and the resin composition (Z) is dynamically adhered. The ratio of the storage elastic modulus (E') and the loss elastic modulus (E'') calculated by the elastic measurement, that is, tan δ (=E''/E') is 0.100 or more at -20 ° C, and is 140 ° C to 200 ° C. It has a crystal melting peak (Pm1).

本發明的第2實施形態的延伸多孔膜較佳為包含含有25質量%～54質量%的熱塑性樹脂、46質量%～75質量%的無機填充材（A）的樹脂組成物（Z）。因而，本發明的第2實施形態的延伸多孔膜更佳為如下的延伸多孔膜，其包含含有25質量%～54質量%的熱塑性樹脂、46質量%～75質量%的無機填充材（A）的樹脂組成物（Z），且該樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，於140℃～200℃下具有結晶熔融峰值（Pm1）。The expanded porous film of the second embodiment of the present invention preferably contains a resin composition (Z) containing 25% by mass to 54% by mass of a thermoplastic resin and 46% by mass to 75% by mass of the inorganic filler (A). Therefore, the expanded porous film of the second embodiment of the present invention is more preferably an expanded porous film containing 25% by mass to 54% by mass of a thermoplastic resin and 46% by mass to 75% by mass of an inorganic filler (A). The resin composition (Z), and the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity of the resin composition (Z) to the loss elastic modulus (E'') is tan δ (=E'' /E') is 0.100 or more at -20 ° C and has a crystal melting peak (Pm1) at 140 ° C to 200 ° C.

本發明的第2實施形態的延伸多孔膜重要的是，構成延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，較佳為0.110以上，更佳為0.120以上，進而佳為0.130以上。另外，關於構成延伸多孔膜的樹脂組成物（Z）的tanδ的上限，並無特別限制，但就尺寸穩定性的觀點而言，較佳為於-20℃下為1.000以下。藉由tanδ（=E''/E'）於-20℃下為0.100以上，如後述般，可提高用以抑制於膜摩擦時所產生的不舒適聲音的吸音係數（振動衰減率），且成為柔軟性或手感之類的觸感優異的膜。In the expanded porous film according to the second embodiment of the present invention, the storage elastic modulus (E') and the loss elastic modulus (E'' calculated from the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film are important. The ratio of tan δ (=E''/E') is 0.100 or more at -20 ° C, preferably 0.110 or more, more preferably 0.120 or more, and still more preferably 0.130 or more. In addition, the upper limit of tan δ of the resin composition (Z) constituting the expanded porous film is not particularly limited, but from the viewpoint of dimensional stability, it is preferably 1.000 or less at -20 °C. By tan δ (=E''/E'), it is 0.100 or more at -20 ° C, and as described later, the sound absorption coefficient (vibration attenuation rate) for suppressing the uncomfortable sound generated when the film is rubbed can be improved, and A film that is excellent in touch such as softness or texture.

所述tanδ較佳為於-20℃～-10℃下為0.100以上，更佳為於-20℃～0℃下為0.100以上，進而佳為於-30℃～0℃下為0.100以上，進而佳為於-30℃～10℃下為0.100以上，進而更佳為於-30℃～20℃下為0.100以上，最佳為於-30℃～30℃下為0.100以上。藉由構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ成為0.100以上的溫度範圍變寬，如後述般，可抑制各種頻率的不舒適聲音。The tan δ is preferably 0.100 or more at -20 ° C to -10 ° C, more preferably 0.100 or more at -20 ° C to 0 ° C, and more preferably 0.100 or more at -30 ° C to 0 ° C. It is preferably 0.100 or more at -30 ° C to 10 ° C, more preferably 0.100 or more at -30 ° C to 20 ° C, and most preferably 0.100 or more at -30 ° C to 30 ° C. The temperature range in which tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film of the second embodiment of the present invention is 0.100 or more is widened, and as will be described later, various frequencies can be suppressed. Comfortable sound.

進而，本發明的第2實施形態的延伸多孔膜的空孔率較佳為15%～80%。空孔率更佳為20%～80%，進而佳為25%～80%。
於空孔率為15%以上的情況下，如後述般，於延伸多孔膜的空隙中傳播的聲音的能量損失機會增多，可充分抑制不舒適聲音。另外，於空孔率為80%以下的情況下，可確保實際可使用的程度的膜強度，進而防水性變得充分，不易引起所接觸的液狀物的洩漏。Further, the expanded porous film of the second embodiment of the present invention preferably has a porosity of 15% to 80%. The porosity is preferably from 20% to 80%, and more preferably from 25% to 80%.
When the porosity is 15% or more, as will be described later, the chance of energy loss of sound propagating in the gap of the extended porous film is increased, and the uncomfortable sound can be sufficiently suppressed. In addition, when the porosity is 80% or less, the film strength to the extent that it can be practically used can be ensured, and the water repellency can be made sufficiently insufficient to cause leakage of the liquid material to be contacted.

聲音是物體移動、或摩擦時所產生的空氣的振動波。於聲音作為入射音撞擊於物體的情況下，自能量守恆定律的關係來看，所述入射音分解為透過物體的透過音、反射物體的反射音、以及被物體吸收的吸收音這三個聲音。即，當入射音撞擊至物體時，若被物體吸收的吸收音的比例大，則認為該物體為吸音係數高的物體。
本發明的第2實施形態的延伸多孔膜為具有連通至樹脂組成物（Z）內部的空隙的膜。即，於本發明的第2實施形態的延伸多孔膜中傳播聲音的情況下，表示使作為膜而形成固體部的樹脂組成物（Z）振動並傳播的聲音、與在形成於膜內部的連通的空隙中傳播的聲音這兩個傳播方式。因此，為了抑制聲音，必須考慮抑制使樹脂組成物（Z）振動並傳播的聲音、以及抑制於連通的空隙中傳播的聲音。The sound is the vibration wave of the air generated when the object moves or rubs. In the case where the sound hits the object as an incident sound, the incident sound is decomposed into three sounds: a transmitted sound transmitted through the object, a reflected sound of the reflected object, and an absorbed sound absorbed by the object, in terms of the relationship of the law of conservation of energy. . That is, when the incident sound hits the object, if the proportion of the absorbed sound absorbed by the object is large, the object is considered to be an object having a high sound absorption coefficient.
The expanded porous film according to the second embodiment of the present invention is a film having a void that communicates with the inside of the resin composition (Z). In other words, when the sound is propagated in the expanded porous film of the second embodiment of the present invention, the sound of the resin composition (Z) which forms a solid portion as a film is vibrated and propagated, and the communication is formed in the inside of the film. The two sounds of the sound that propagate in the gap. Therefore, in order to suppress the sound, it is necessary to suppress the sound which vibrates and propagates the resin composition (Z) and the sound which propagates in the communicating gap.

為了抑制本發明的第2實施形態的延伸多孔膜中的使樹脂組成物（Z）振動並傳播的聲音，認為有效的是聲音於振動源或介質中的衰減。於如樹脂般的黏彈性體中，藉由使振動能損失為熱能而獲得吸音效果。因而，認為儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ成為為了表現出所述吸音效果而需要的要素。因此，於本發明的第2實施形態中，構成延伸多孔膜的樹脂組成物（Z）的tanδ的峰值較佳為大。
另外，構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的tanδ的峰值位置與聲音於產生環境溫度下的衰減相關，並且就溫度-時間換算法則的觀點而言，亦與相對於頻率而言的衰減相關。因此，為了吸收具有各種頻率的不舒適聲音或者不使其產生，tanδ的峰值寬度較佳為寬。
因而，構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上對於抑制在膜的摩擦時所產生的不舒適聲音的發生是重要的。如所述般，tanδ成為0.100以上的溫度範圍變寬由於能夠抑制各種頻率的不舒適聲音，因此較佳。In order to suppress the sound which vibrates and propagates the resin composition (Z) in the expanded porous film of the second embodiment of the present invention, it is considered that the sound is attenuated by the sound in the vibration source or the medium. In a resin-like viscoelastic body, a sound absorbing effect is obtained by making vibration energy loss into heat energy. Therefore, it is considered that tan δ, which is a ratio of the storage elastic modulus (E') to the loss elastic coefficient (E''), is an element required to exhibit the sound absorbing effect. Therefore, in the second embodiment of the present invention, the peak value of tan δ of the resin composition (Z) constituting the expanded porous film is preferably large.
Further, the peak position of tan δ of the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention is related to the attenuation of the sound at the ambient temperature, and also from the viewpoint of the temperature-time conversion algorithm. Correlated with attenuation with respect to frequency. Therefore, in order to absorb or not generate an uncomfortable sound having various frequencies, the peak width of tan δ is preferably wide.
Therefore, the ratio of the storage elastic modulus (E') and the loss elastic modulus (E'') calculated by the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film of the second embodiment of the present invention is tan δ. (=E''/E') of 0.100 or more at -20 ° C is important for suppressing the occurrence of uncomfortable sound generated when the film is rubbed. As described above, a wide temperature range in which tan δ is 0.100 or more is preferable because it can suppress uncomfortable sound at various frequencies.

另外，認為多孔膜的空孔率亦有助於抑制所傳播的聲音。藉由空孔率增加，於空氣中傳播的聲音與物體的撞擊次數增加，因此認為獲得抑制在形成於膜內部的連通的空隙中傳播的聲音的效果。
因而，為了使於膜的空隙中傳播的聲音的能量損失機會增多，較佳為延伸多孔膜的空孔率為15%以上。In addition, it is considered that the porosity of the porous film also contributes to suppressing the transmitted sound. Since the number of collisions between the sound propagating in the air and the object is increased by the increase in the porosity, it is considered that the effect of suppressing the sound propagating in the communicating gap formed inside the film is obtained.
Therefore, in order to increase the chance of energy loss of sound propagating in the voids of the film, it is preferable that the porosity of the expanded porous film is 15% or more.

本發明的第2實施形態的延伸多孔膜重要的是於140℃～200℃下具有結晶熔融峰值（Pm1）。另外，較佳為於150℃～190℃下具有所述結晶熔融峰值（Pm1），更佳為於160℃～180℃下具有所述結晶熔融峰值（Pm1）。藉由在140℃以上具有結晶熔融峰值（Pm1），當將延伸多孔膜與其他構件接著、層壓時，可賦予充分的耐熱性，因此變得重要。另外，藉由在200℃以下具有結晶熔融峰值（Pm1），而於延伸多孔膜的成形中無需極度提高擠出溫度，因此不易產生樹脂的劣化物等，且生產性提升，因此較佳。
為了具有所述結晶熔融峰值（Pm1），藉由在構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）中含有熔點為140℃～200℃的熱塑性樹脂，可調整為於所述範圍內具有結晶熔融峰值（Pm1）。It is important that the expanded porous film of the second embodiment of the present invention has a crystal melting peak (Pm1) at 140 ° C to 200 ° C. Further, it is preferable to have the crystal melting peak (Pm1) at 150 ° C to 190 ° C, and more preferably the crystal melting peak (Pm1) at 160 ° C to 180 ° C. By having a crystal melting peak (Pm1) at 140 ° C or higher, it is important to impart sufficient heat resistance when the stretched porous film is laminated and laminated with other members. In addition, since the crystal melting peak (Pm1) is contained at 200 ° C or lower, it is not necessary to extremely increase the extrusion temperature in the formation of the elongated porous film, so that deterioration of the resin or the like is less likely to occur, and productivity is improved, which is preferable.
In order to have the crystal melting peak (Pm1), the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention contains a thermoplastic resin having a melting point of 140 to 200 ° C, and can be adjusted to The range has a crystal melting peak (Pm1) in the range.

另外，本發明的第2實施形態的延伸多孔膜較佳為根據所述結晶熔融峰值（Pm1）而算出的結晶熔融焓（ΔHm1）為1 J/g～10 J/g。所述結晶熔融焓（ΔHm1）更佳為1 J/g～8 J/g，進而佳為2 J/g～6 J/g。藉由所述結晶熔融焓（ΔHm1）為1 J/g以上，而具有用以對延伸多孔膜賦予耐熱性的充分的結晶成分，因此較佳。另外，藉由所述結晶熔融焓（ΔHm1）成為10 J/g以下，可抑制後述不舒適聲音的產生。
藉由對構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）中的熔點為140℃～200℃的熱塑性樹脂的混合比率進行調整，可將結晶熔融焓（ΔHm1）調整為所述範圍。In the expanded porous film according to the second embodiment of the present invention, the crystal melting enthalpy (ΔHm1) calculated based on the crystal melting peak (Pm1) is preferably 1 J/g to 10 J/g. The crystal melting enthalpy (ΔHm1) is more preferably 1 J/g to 8 J/g, and still more preferably 2 J/g to 6 J/g. It is preferable that the crystal melting enthalpy (ΔHm1) is 1 J/g or more and has a sufficient crystal component for imparting heat resistance to the expanded porous film. In addition, when the crystal melting enthalpy (ΔHm1) is 10 J/g or less, generation of an uncomfortable sound described later can be suppressed.
By adjusting the mixing ratio of the thermoplastic resin having a melting point of 140 ° C to 200 ° C in the resin composition (Z) of the expanded porous film of the second embodiment of the present invention, the crystal melting enthalpy (ΔHm1) can be adjusted to The range.

本發明的第2實施形態的延伸多孔膜較佳為於30℃～130℃下進而具有結晶熔融峰值（Pm2）。另外，根據所述結晶熔融峰值（Pm2）而算出的結晶熔融焓（ΔHm2）較佳為10 J/g～45 J/g。所述結晶熔融焓（ΔHm2）更佳為12 J/g～43 J/g，進而佳為14 J/g～41 J/g。藉由所述結晶熔融焓（ΔHm2）成為10 J/g以上，可確保延伸多孔膜的耐熱性或尺寸穩定性。另外，藉由所述結晶熔融焓（ΔHm2）成為45 J/g以下，可抑制後述不舒適聲音的產生。
為了具有所述結晶熔融峰值（Pm2），藉由在構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）中含有熔點為30℃～130℃的熱塑性樹脂，並調整混合比率，可將結晶熔融峰值（Pm2）、及結晶熔融焓（ΔHm2）調整為所述範圍。The expanded porous film of the second embodiment of the present invention preferably has a crystal melting peak (Pm2) at 30 to 130 °C. Further, the crystal melting enthalpy (ΔHm2) calculated from the crystal melting peak (Pm2) is preferably from 10 J/g to 45 J/g. The crystal melting enthalpy (ΔHm2) is more preferably from 12 J/g to 43 J/g, and still more preferably from 14 J/g to 41 J/g. When the crystal melting enthalpy (ΔHm2) is 10 J/g or more, the heat resistance or dimensional stability of the expanded porous film can be ensured. In addition, when the crystal melting enthalpy (ΔHm2) is 45 J/g or less, generation of an uncomfortable sound described later can be suppressed.
In order to have the crystal melting peak (Pm2), a thermoplastic resin having a melting point of 30 to 130 ° C is contained in the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention, and the mixing ratio is adjusted. The crystal melting peak (Pm2) and the crystal melting enthalpy (ΔHm2) can be adjusted to the above range.

作為抑制使延伸多孔膜相互摩擦時所產生的不舒適聲音的方法，認為有效的是抑制所述傳播音，並且抑制自聲源產生聲音。聲音的產生是彈性體的振動，只要不存在引起振動者（=聲源），則不會產生聲音。
若著眼於構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）中所包含的熱塑性樹脂，則熱塑性樹脂為具有彈性性質與黏性性質兩者的黏彈性體。即，藉由減少熱塑性樹脂的彈性性質的比例，當賦予使膜相互摩擦的外力時，排斥該外力並振動的彈性成分減少，聲音的產生得到抑制。表示彈性性質與黏性性質的比例的指標為所述tanδ，但認為就宏觀視角與微觀視角而言減少所述彈性性質的比例對於減少不舒適聲音是有效的。所謂宏觀視角的彈性性質，是指所述構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'），所謂微觀視角的彈性性質，是指後述樹脂的結晶成分。As a method of suppressing an uncomfortable sound generated when the elongated porous film is rubbed against each other, it is considered effective to suppress the propagation sound and suppress generation of sound from the sound source. The generation of sound is the vibration of the elastic body, and as long as there is no vibration (= sound source), no sound is produced.
When the thermoplastic resin contained in the resin composition (Z) of the expanded porous film of the second embodiment of the present invention is focused, the thermoplastic resin is a viscoelastic body having both an elastic property and a viscous property. That is, by reducing the ratio of the elastic properties of the thermoplastic resin, when an external force that causes the films to rub against each other is imparted, the elastic component that repels the external force and vibrates is reduced, and the generation of sound is suppressed. An index indicating the ratio of the elastic property to the viscous property is the tan δ, but it is considered that reducing the ratio of the elastic property in terms of the macroscopic angle of view and the microscopic viewing angle is effective for reducing uncomfortable sound. The elastic property of the macroscopic viewing angle refers to the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention, and the so-called microscopic viewing angle The elastic property refers to the crystalline component of the resin described later.

首先，就減少宏觀視角的彈性性質的觀點而言，構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）較佳為於20℃下為8.0×10⁸ Pa以下。更佳為7.0×10⁸ Pa以下，進而佳為6.0×10⁸ Pa以下。於儲存彈性係數（E'）於20℃下為8.0×10⁸ Pa以下的情況下，延伸多孔膜成為手感或柔軟性之類的觸感優異者，並且可抑制不舒適聲音的產生，因此較佳。另外，關於下限，並無特別限定，但就延伸多孔膜的處理（handling）的觀點而言，較佳為於20℃下為1.0×10⁷ Pa以上。First, the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film of the second embodiment of the present invention is reduced from the viewpoint of reducing the elastic properties of the macroscopic viewing angle. It is preferably 8.0 × 10 ⁸ Pa or less at 20 ° C. More preferably, it is 7.0 × 10 ⁸ Pa or less, and further preferably 6.0 × 10 ⁸ Pa or less. When the storage elastic modulus (E') is 8.0 × 10 ⁸ Pa or less at 20 ° C, the stretched porous film is excellent in touch such as hand feeling or softness, and can suppress generation of uncomfortable sound, and thus good. Further, the lower limit is not particularly limited, but from the viewpoint of handling of the extended porous film, it is preferably 1.0 × 10 ⁷ Pa or more at 20 °C.

構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的動態黏彈性測定是將剪裁為寬4 mm、長35 mm的長條狀的樣品片以測定頻率10 Hz、測定應變0.1%、夾頭間距離25 mm一面自測定溫度-100℃起以升溫速度3℃/min進行升溫一面進行測定。此時，根據所獲得的動態黏彈性的溫度依存性剖面圖而算出各溫度下的儲存彈性係數（E'）、損失彈性係數（E''）、及儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）。
再者，關於動態黏彈性測定，預先測定樣品片的厚度，並將樣品片的厚度與樣品片的寬度值輸入至測定裝置中，藉此計算樣品片的剖面積，並算出各值。
本發明的第2實施形態的延伸多孔膜於樹脂組成物（Z）中產生有空隙，因此於直接測定多孔體的情況下，所算出的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ容易產生誤差。因此，為了獲得本發明的第2實施形態所規定的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ，較佳為對使用構成延伸多孔膜的樹脂組成物（Z）的未延伸膜並剪裁為MD：4 mm、TD：35 mm的長條狀的樣品片進行動態黏彈性測定。但是，藉由將延伸多孔膜加熱為熔點以上而將膜熔融並使空孔消失後，製作壓製樣品，自該壓製樣品剪裁長條狀的樣品片並進行動態黏彈性測定，藉此亦能夠算出本發明的第2實施形態所規定的儲存彈性係數（E'）、損失彈性係數（E''）、及tanδ。本發明中，任一測定方法均可採用。The dynamic viscoelasticity of the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention is measured by measuring a strain of a strip sample having a width of 4 mm and a length of 35 mm at a measurement frequency of 10 Hz. 0.1% and a distance of 25 mm between the chucks were measured while the temperature was raised at a temperature increase rate of 3 ° C/min from the measurement temperature of -100 °C. At this time, the storage elastic modulus (E'), the loss elastic modulus (E''), and the storage elastic coefficient (E') and the loss elasticity at each temperature were calculated from the obtained temperature-dependent cross-sectional view of the dynamic viscoelasticity. The ratio of the coefficient (E'') is tan δ (=E''/E').
Further, regarding the dynamic viscoelasticity measurement, the thickness of the sample piece is measured in advance, and the thickness of the sample piece and the width value of the sample piece are input to the measuring device, whereby the cross-sectional area of the sample piece is calculated, and each value is calculated.
In the expanded porous film according to the second embodiment of the present invention, voids are generated in the resin composition (Z). Therefore, when the porous body is directly measured, the calculated storage elastic modulus (E') and the loss elastic modulus (E' are calculated. '), and tan δ are prone to errors. Therefore, in order to obtain the storage elastic modulus (E'), the loss elastic modulus (E''), and tan δ defined in the second embodiment of the present invention, it is preferable to use the resin composition (Z) constituting the elongated porous film. The unstretched film was cut into strips of MD: 4 mm, TD: 35 mm for dynamic viscoelasticity measurement. However, by heating the expanded porous film to a melting point or higher and melting the film and eliminating voids, a pressed sample is prepared, and a long sample piece is cut from the pressed sample, and dynamic viscoelasticity measurement is performed, whereby it is also possible to calculate The storage elastic modulus (E'), the loss elastic modulus (E''), and tan δ defined by the second embodiment of the present invention. In the present invention, any of the measurement methods can be employed.

繼而，作為微觀視角的彈性性質，考慮到樹脂的結晶成分。就結晶的觀點而言，熱塑性樹脂分類為非晶性樹脂與結晶性樹脂。非晶性樹脂為由於分子鏈具有體積比較大的結構，因此分子鏈無法有序地折疊，且不具有結晶部分的熱塑性樹脂。另一方面，結晶性樹脂為分子鏈有序地折疊、且於內部具有密度高的結晶部分的熱塑性樹脂。其中，即便是結晶性樹脂，亦不存在分子鏈100%結晶化的結晶性樹脂，具有分子鏈隨機排列的非晶部與分子鏈有序地折疊的結晶部兩者。
結晶性樹脂的非晶部於玻璃轉移溫度以上的溫度範圍內可進行微布朗運動，並處於移動率高的狀態。另一方面，結晶性樹脂的結晶部於玻璃轉移溫度以上且熔點以下的溫度範圍內，分子鏈作為結晶而受到限制，並成為彈性係數非常高的部位。因此，於結晶性樹脂的結晶化度低的情況下，彈性係數高的結晶部減少，因此認為賦予外力時排斥並振動的成分少，所產生的聲音亦變小。
因而，結晶熔融焓成為本發明的第2實施形態的延伸多孔膜中的結晶成分比例的指標，且所述結晶熔融焓（ΔHm1）較佳為1 J/g～10 J/g。另外，所述結晶熔融焓（ΔHm2）較佳為10 J/g～45 J/g。Then, as the elastic property of the microscopic viewing angle, the crystal component of the resin is considered. From the viewpoint of crystallization, thermoplastic resins are classified into amorphous resins and crystalline resins. The amorphous resin is a thermoplastic resin which does not have a crystalline portion because the molecular chain has a relatively large volume structure, so that the molecular chain cannot be folded in an orderly manner. On the other hand, the crystalline resin is a thermoplastic resin in which molecular chains are sequentially folded and has a crystal portion having a high density inside. Among them, even in the case of the crystalline resin, there is no crystalline resin in which the molecular chain is 100% crystallized, and both the amorphous portion in which the molecular chains are randomly arranged and the crystal portion in which the molecular chains are sequentially folded are formed.
The amorphous portion of the crystalline resin can undergo micro-Brown movement in a temperature range of not less than the glass transition temperature, and is in a state in which the mobility is high. On the other hand, in the temperature range in which the crystal portion of the crystalline resin is at least the glass transition temperature and not higher than the melting point, the molecular chain is restricted as a crystal and becomes a site having a very high elastic modulus. Therefore, when the degree of crystallization of the crystalline resin is low, the crystal portion having a high elastic modulus is reduced. Therefore, it is considered that the amount of components which are repelled and vibrated when an external force is applied is small, and the generated sound is also small.
Therefore, the crystal melting enthalpy is an index of the ratio of the crystal components in the expanded porous film of the second embodiment of the present invention, and the crystal melting enthalpy (ΔHm1) is preferably from 1 J/g to 10 J/g. Further, the crystal melting enthalpy (ΔHm2) is preferably from 10 J/g to 45 J/g.

關於本發明的第2實施形態的延伸多孔膜的結晶熔融峰值（Pm）及其峰值溫度（Tm），為利用示差掃描型熱量計（DSC）將本發明的第2實施形態的延伸多孔膜以加熱速度10℃/分鐘自-40℃升溫至高溫保持溫度後，保持1分鐘，繼而以冷卻速度10℃/分鐘自高溫保持溫度降溫至-40℃後，保持1分鐘，進而以加熱速度10℃/分鐘自-40℃再升溫至所述高溫保持溫度時出現的結晶熔融峰值（Pm）、及表示所述峰值的溫度（Tm）。
另外，關於結晶熔融焓（ΔHm），根據再升溫時出現的所述結晶熔融峰值（Pm）的峰值面積算出結晶熔融焓（ΔHm）。此時，所述高溫保持溫度相對於所使用的熱塑性樹脂的最高結晶熔融峰值溫度（Tm），可於Tm+20℃以上且Tm+150℃以下的範圍內任意地選擇。
再者，本發明的第2實施形態中的結晶熔融焓（ΔHm）即便於所述再升溫過程中發生如在半結晶性樹脂中所看到的冷結晶化的情況下，亦應用根據再升溫過程中所產生的結晶熔融峰值而算出的ΔHm。即，不自再升溫過程中所獲得的ΔHm中減去根據再升溫過程中所產生的冷結晶化中的發熱峰值面積而算出的結晶化焓（ΔHc）。The crystal melting peak (Pm) and the peak temperature (Tm) of the expanded porous film according to the second embodiment of the present invention are the extended porous film of the second embodiment of the present invention by a differential scanning calorimeter (DSC). After heating at a heating rate of 10 ° C / min from -40 ° C to a high temperature holding temperature, hold for 1 minute, then maintain the temperature from high temperature to -40 ° C at a cooling rate of 10 ° C / min, hold for 1 minute, and then heat at 10 ° C /min The crystal melting peak (Pm) which is generated when the temperature is further raised from -40 ° C to the high temperature holding temperature, and the temperature (Tm) indicating the peak.
Further, regarding the crystal melting enthalpy (ΔHm), the crystal melting enthalpy (ΔHm) is calculated from the peak area of the crystal melting peak (Pm) which occurs when the temperature is raised again. In this case, the high temperature holding temperature can be arbitrarily selected within a range of Tm + 20 ° C or more and Tm + 150 ° C or less with respect to the highest crystal melting peak temperature (Tm) of the thermoplastic resin to be used.
Further, in the case where the crystal melting enthalpy (?Hm) in the second embodiment of the present invention occurs in the case of cold crystallization as seen in the semi-crystalline resin during the reheating process, the application is based on reheating. ΔHm calculated from the peak of crystal melting generated in the process. In other words, the crystallization enthalpy (ΔHc) calculated based on the area of the heat generation peak in the cold crystallization which is generated during the reheating process is not subtracted from ΔHm obtained during the temperature increase.

進而，於將本發明的第2實施形態的延伸多孔膜與其他層積層的情況下，若對積層體直接進行DSC測定，則有估計源於所述延伸多孔膜的ΔHm低之虞。因此，於本發明的第2實施形態的延伸多孔膜為積層體的情況下，可將本發明的第2實施形態的延伸多孔膜剝離，並對該多孔層測定ΔHm。於難以剝離的情況下，藉由DSC測定來算出積層體整體的本發明的第2實施形態的延伸多孔膜的ΔHm，並且算出積層體整體的所述多孔層的積層比，藉由以下的計算式可算出本發明的第2實施形態中的ΔHm。再者，積層比的算出並無特別限定，但較佳為藉由利用光學顯微鏡、電子顯微鏡等進行的剖面觀察來算出。

本發明的第2實施形態中的ΔHm（J/g）=積層體整體的延伸多孔膜的ΔHm（J/g）/積層體整體的所述多孔層的積層比（%）/100（%）Further, when the expanded porous film of the second embodiment of the present invention is laminated with another layer, if the laminated body is directly subjected to DSC measurement, it is estimated that the ΔHm derived from the expanded porous film is low. Therefore, when the expanded porous film of the second embodiment of the present invention is a laminate, the expanded porous film of the second embodiment of the present invention can be peeled off, and ΔHm can be measured for the porous layer. In the case where it is difficult to remove, the ΔHm of the expanded porous film of the second embodiment of the present invention, which is the entire laminated body, is calculated by DSC measurement, and the laminated ratio of the porous layer of the entire laminated body is calculated, and the following calculation is performed. The formula can calculate ΔHm in the second embodiment of the present invention. In addition, the calculation of the laminated ratio is not particularly limited, but is preferably calculated by cross-sectional observation by an optical microscope, an electron microscope, or the like.

ΔHm (J/g) in the second embodiment of the present invention = ΔHm (J/g) of the expanded porous film of the entire laminated body / laminated ratio (%) / 100 (%) of the porous layer of the entire laminated body

另外，重要的是於140℃～200℃下具有本發明的第2實施形態的延伸多孔膜中的結晶熔融峰值（Pm1），但於140℃～200℃下具有至少一個結晶熔融峰值即可，亦可為兩個以上。另外，於140℃～200℃下存在兩個以上的結晶熔融峰值的情況下，所述結晶熔融焓（ΔHm1）成為根據兩個以上的結晶熔融峰值而算出的結晶熔融焓的合計值。In addition, it is important to have a crystal melting peak (Pm1) in the expanded porous film of the second embodiment of the present invention at 140 ° C to 200 ° C, but it is preferable to have at least one crystal melting peak at 140 ° C to 200 ° C. It can also be two or more. In the case where two or more crystal melting peaks are present at 140 ° C to 200 ° C, the crystal melting enthalpy (ΔHm1) is a total value of crystal melting enthalpy calculated based on two or more crystal melting peaks.

另外，關於所述結晶熔融峰值（Pm2），亦較佳為於30℃～130℃下具有至少一個結晶熔融峰值，但亦可為兩個以上。另外，於30℃～130℃下存在兩個以上的結晶熔融峰值的情況下，所述結晶熔融焓（ΔHm2）成為根據兩個以上的結晶熔融峰值而算出的結晶熔融焓的合計值。Further, the crystal melting peak (Pm2) preferably has at least one crystal melting peak at 30 to 130 ° C, but may be two or more. In the case where two or more crystal melting peaks are present at 30° C. to 130° C., the crystal melting enthalpy (ΔHm 2 ) is a total value of crystal melting enthalpy calculated based on two or more crystal melting peaks.

另外，於構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）中所包含的熱塑性樹脂為聚烯烴系樹脂的情況下，結晶熔融起始溫度自較結晶熔融峰值溫度（Tm）低30℃以上的溫度起一點點熔融，且大多表示寬峰。因此，對於示差掃描型熱量測定（DSC），藉由自-40℃起升溫，可明確基線，並算出更準確的結晶熔融焓（ΔHm）。In the case where the thermoplastic resin contained in the resin composition (Z) of the expanded porous film of the second embodiment of the present invention is a polyolefin resin, the crystal melting initiation temperature is higher than the crystal melting peak temperature (Tm). The temperature lower than 30 ° C is slightly melted, and most of them indicate a broad peak. Therefore, for the differential scanning calorimetry (DSC), the temperature is raised from -40 ° C, and the baseline can be confirmed, and a more accurate crystal melting enthalpy (ΔHm) can be calculated.

總結以上，本發明的第2實施形態中，藉由將樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ、以及產生結晶熔融峰值（Pm1）的溫度設為適當範圍，不僅柔軟性或手感之類的觸感優異，而且提高用以抑制於膜摩擦時所產生的不舒適聲音的吸音係數（振動衰減率），並且兼顧了對延伸多孔膜要求的耐熱性。In the second embodiment of the present invention, the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) to the loss elastic modulus (E'') is tan δ. The temperature at which the crystal melting peak (Pm1) is generated is set to an appropriate range, and not only the touch feeling such as softness or hand feeling is excellent, but also the sound absorption coefficient (vibration decay rate) for suppressing the uncomfortable sound generated when the film is rubbed is increased. ), and the heat resistance required for the extended porous film is taken into consideration.

關於本發明的第2實施形態的延伸多孔膜中的空孔率，將延伸多孔膜剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行延伸多孔膜的比重（W1）的測定。繼而，對構成本發明的第2實施形態的延伸多孔膜的樹脂組成物（Z）的比重（W0）進行測定。於所述樹脂組成物（Z）的比重（W0）的測定中，可將本發明的第2實施形態的延伸多孔膜的未延伸膜剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行比重測定。另外，於難以採取未延伸片材的情況下，將本發明的第2實施形態的延伸多孔膜加熱為熔點以上，藉此將延伸多孔膜熔融並使空孔消失後，製作壓製樣品，自該壓製樣品剪裁為縱向（MD）：50 mm、橫向（TD）：50 mm的大小並進行比重測定。
所述延伸多孔膜的比重（W1）及所述樹脂組成物（Z）的比重（W0）的測定是隨機測定3點並使用其算術平均值。根據所獲得的所述延伸多孔膜的比重（W1）及所述樹脂組成物（Z）的比重（W0）並藉由下式來算出空孔率。

空孔率（%）=[1-（W1/W0）]×100In the porosity of the expanded porous film according to the second embodiment of the present invention, the elongated porous film is cut into a longitudinal direction (MD): 50 mm, a lateral direction (TD): 50 mm, and the specific gravity of the elongated porous film is performed (W1). Determination of). Then, the specific gravity (W0) of the resin composition (Z) constituting the expanded porous film of the second embodiment of the present invention was measured. In the measurement of the specific gravity (W0) of the resin composition (Z), the unstretched film of the expanded porous film of the second embodiment of the present invention can be cut into the machine direction (MD): 50 mm and the transverse direction (TD): The size of 50 mm was measured for specific gravity. In addition, when it is difficult to take the unstretched sheet, the expanded porous film of the second embodiment of the present invention is heated to a melting point or higher, whereby the expanded porous film is melted and the pores are eliminated, and then a pressed sample is produced. The pressed sample was cut into a machine direction (MD): 50 mm, lateral (TD): 50 mm and subjected to specific gravity measurement.
The specific gravity (W1) of the expanded porous film and the specific gravity (W0) of the resin composition (Z) were measured at three points at random and the arithmetic mean thereof was used. The porosity was calculated from the specific gravity (W1) of the obtained expanded porous film and the specific gravity (W0) of the resin composition (Z) by the following formula.

Porosity (%) = [1-(W1/W0)] × 100

本發明的第2實施形態的延伸多孔膜中的基重較佳為10 g/m² ~50 g/m² ，更佳為12 g/m² ~40 g/m² 。藉由基重為10 g/m² 以上，容易充分確保拉伸強度、撕裂強度等機械強度。另外，藉由基重為50 g/m² 以下，容易獲得充分的輕量感。
此處，關於基重，利用電子天平測定樣品（縱向（MD）：250 mm、橫向（TD）：200 mm）的質量（g），並將使該數值乘以20倍所得的值作為基重。The basis weight in the expanded porous film of the second embodiment of the present invention is preferably from 10 g/m ² to 50 g/m ² , more preferably from 12 g/m ² to 40 g/m ² . By having a basis weight of 10 g/m ² or more, it is easy to sufficiently ensure mechanical strength such as tensile strength and tear strength. Further, by having a basis weight of 50 g/m ² or less, it is easy to obtain a sufficient light weight.
Here, regarding the basis weight, the mass (g) of the sample (longitudinal (MD): 250 mm, lateral direction (TD): 200 mm) was measured using an electronic balance, and the value obtained by multiplying the value by 20 times was used as the basis weight. .

本發明的第2實施形態的延伸多孔膜中的透氣度較佳為1秒/100 mL～5000秒/100 mL，更佳為10秒/100 mL～4000秒/100 mL，進而佳為100秒/100 mL～3000秒/100 mL。藉由透氣度為1秒/100 mL以上，容易充分確保耐水性及耐透液性。另外，藉由透氣度為5000秒/100 mL以下，暗示具有充分的連通孔。
此處，透氣度是依據由JIS P8117：2009（哥雷（Gurley）試驗機法）規定的方法測定的100 mL的空氣通過紙片的秒數，例如可使用透氣度測定裝置（旭精工製造的王研式透氣度測定機EGO1-55型）來測定。本發明中，對樣品隨機測定10點，並將其算術平均值作為透氣度。The air permeability in the expanded porous film according to the second embodiment of the present invention is preferably from 1 second/100 mL to 5000 seconds/100 mL, more preferably from 10 seconds/100 mL to 4000 seconds/100 mL, and further preferably 100 seconds. /100 mL to 3000 seconds / 100 mL. By having a gas permeability of 1 second/100 mL or more, it is easy to sufficiently ensure water resistance and liquid permeability resistance. Further, by having a gas permeability of 5000 sec/100 mL or less, it is suggested that there is a sufficient communication hole.
Here, the air permeability is the number of seconds in which 100 mL of air passes through the paper sheet measured by a method specified in JIS P8117:2009 (Gurley Test Machine Method), and for example, a gas permeability measuring device (a king manufactured by Asahi Seiko Co., Ltd.) can be used. The test type air permeability measuring machine EGO1-55 type) was measured. In the present invention, the sample is randomly measured at 10 points, and its arithmetic mean is taken as the air permeability.

本發明的第2實施形態的延伸多孔膜中的透濕度較佳為1000 g/（m² ·24h）～15000 g/（m² ·24h），更佳為1500 g/（m² ·24h）～12000 g/（m² ·24h）。藉由透濕度為15000 g/（m² ·24h）以下，暗示具有耐水性。另外，藉由透濕度為1000 g/（m² ·24h）以上，暗示空孔具有充分的連通性。
此處，透濕度依據JIS Z0208（防濕包裝材料的透濕度試驗方法（杯法））的各條件。使用15 g氯化鈣作為吸濕劑，並於溫度40℃、相對濕度90%的恆溫恆濕環境下進行測定。對樣品隨機測定2點，並求出其算術平均值。The moisture permeability in the expanded porous film according to the second embodiment of the present invention is preferably from 1000 g/(m ² ·24 h) to 15,000 g/(m ² ·24 h), more preferably 1500 g/(m ² ·24 h). ~12000 g / (m ² · 24h). By having a moisture permeability of 15,000 g/(m ² ·24h) or less, it is suggested to have water resistance. Further, by the moisture permeability of 1000 g/(m ² ·24h) or more, it is suggested that the pores have sufficient connectivity.
Here, the moisture permeability is in accordance with each condition of JIS Z0208 (the moisture permeability test method (cup method) of the moisture-proof packaging material). 15 g of calcium chloride was used as a moisture absorbent, and the measurement was carried out in a constant temperature and humidity environment at a temperature of 40 ° C and a relative humidity of 90%. The sample was randomly measured at 2 points and the arithmetic mean was obtained.

本發明的第2實施形態的延伸多孔膜中的延伸方向的拉伸斷裂強度較佳為7 N/25 mm以上，更佳為10 N/25 mm以上。藉由所述拉伸斷裂強度為7 N/25 mm以上，可確保實用上充分的機械強度與柔軟性。另外，關於上限，並無特別限定，但若鑒於延伸性，則較佳為35 N/25 mm以下。此處，關於延伸方向的拉伸斷裂強度，為依據JIS K7127製作剪裁為延伸方向100 mm×與延伸方向垂直的方向25 mm的樣品，並於23℃、相對濕度50%的環境下，於拉伸速度200 m/min、夾頭間距離50 mm的條件下使用三連式拉伸試驗機使其斷裂時的拉伸斷裂強度。本發明中，設為進行3次測定而算出的拉伸斷裂強度的算術平均值。The tensile breaking strength in the extending direction of the expanded porous film of the second embodiment of the present invention is preferably 7 N/25 mm or more, and more preferably 10 N/25 mm or more. By the tensile breaking strength of 7 N/25 mm or more, practically sufficient mechanical strength and flexibility can be ensured. Further, the upper limit is not particularly limited, but is preferably 35 N/25 mm or less in view of the elongation. Here, the tensile breaking strength in the extending direction is a sample which is cut to a direction of 100 mm in the extending direction and perpendicular to the extending direction in accordance with JIS K7127, and is pulled at 23 ° C and a relative humidity of 50%. The tensile strength at break when the tensile speed was 200 m/min and the distance between the chucks was 50 mm using a three-joint tensile tester. In the present invention, the arithmetic mean value of the tensile breaking strength calculated by performing three measurements is used.

本發明的第2實施形態的延伸多孔膜中的延伸方向的拉伸斷裂伸長率較佳為40%~400%，更佳為80%~300%。若拉伸斷裂伸長率為40%以上，則於將本發明的第2實施形態的延伸多孔膜用於紙尿布、及生理處理用品等的透濕防水用後片材等衛生用品中的情況下，皮膚接觸良好，可獲得優異的穿著舒適性。另外，若拉伸斷裂伸長率為400%以下，則具有適度的剛性與抗張力，機械特性優異，於印刷、開縫、以及捲取加工時膜的伸長率及應變小，從而獲得生產線中的優異的機械適應性。
此處，關於延伸方向的拉伸斷裂伸長率，為依據JIS K7127製作剪裁為延伸方向100 mm×與延伸方向垂直的方向25 mm的樣品，並於23℃、相對濕度50%的環境下，於拉伸速度200 m/min、夾頭間距離50 mm的條件下使用三連式拉伸試驗機使其斷裂時的拉伸斷裂伸長率。本發明中，設為進行3次測定而算出的拉伸斷裂伸長率的算術平均值。The tensile elongation at break in the extending direction of the expanded porous film of the second embodiment of the present invention is preferably from 40% to 400%, more preferably from 80% to 300%. When the tensile elongation at break is 40% or more, the expanded porous film of the second embodiment of the present invention is used in a sanitary article such as a disposable diaper or a moisture-repellent waterproof sheet such as a physiological treatment product. Good skin contact and excellent wearing comfort. In addition, when the tensile elongation at break is 400% or less, it has moderate rigidity and tensile strength, and is excellent in mechanical properties, and the elongation and strain of the film during printing, slitting, and coiling are small, thereby obtaining excellent in the production line. Mechanical adaptability.
Here, the tensile elongation at break in the extending direction is a sample which is cut into a direction of 100 mm in the extending direction and perpendicular to the extending direction in accordance with JIS K7127, and is in an environment of 23 ° C and a relative humidity of 50%. Tensile elongation at break when the tensile speed was 200 m/min and the distance between the chucks was 50 mm using a three-joint tensile tester. In the present invention, the arithmetic mean value of the tensile elongation at break calculated by performing three measurements is used.

本發明的第2實施形態的延伸多孔膜中的總光線透過率較佳為18%～60%。藉由總光線透過率為18%以上，於將本發明的第2實施形態的延伸多孔膜用於紙尿布等的透濕防水用後片材等衛生用品中的情況下，即便塗佈通知已排尿的指示藥劑亦能夠識別。另外，藉由總光線透過率為60%以下，而膜是白色的，且富有隱蔽性。
此處，關於總光線透過率，使用依據JIS K7361的霧度計，隨機測定5點，並求出其算術平均值。The total light transmittance in the expanded porous film of the second embodiment of the present invention is preferably from 18% to 60%. In the case where the extended porous film of the second embodiment of the present invention is used in a sanitary article such as a moisture permeable waterproof sheet such as a disposable diaper, the total light transmittance is 18% or more. The indicator agent for urination can also be identified. Further, since the total light transmittance is 60% or less, the film is white and concealed.
Here, regarding the total light transmittance, 5 points were randomly measured using a haze meter according to JIS K7361, and the arithmetic mean value thereof was obtained.

本發明的第2實施形態的延伸多孔膜中的破膜耐熱溫度較佳為120℃以上，更佳為140℃以上，進而佳為160℃以上。若破膜耐熱溫度為120℃以上，則可判斷為，當將本發明的第2實施形態的延伸多孔膜與其他構件接著、層壓時，不會出現膜因熱熔接著劑等的熱而破膜的情況，並對延伸多孔膜賦予了必要的耐熱性。
此處，關於破膜耐熱溫度，利用2片將其中心沖裁為Φ50 mm的圓狀的不鏽鋼板（100 mm×100 mm×2 mm（厚度））夾持樣品（100 mm×100 mm），並利用夾具（clip）將四邊固定，於槽內溫度120℃的對流烘箱中靜置2分鐘並加熱後，不鏽鋼板的圓狀沖裁部位的樣品是否熔融、穿孔，以目視來判斷所述情形，將無破裂或穿孔者設為破膜耐熱溫度為120℃以上。另外，將槽內溫度變更為140℃、160℃，並進行同樣的評價時，將無破裂或穿孔者分別設為破膜耐熱溫度為140℃以上、160℃以上。The rupture heat resistance temperature in the expanded porous film of the second embodiment of the present invention is preferably 120 ° C or higher, more preferably 140 ° C or higher, and still more preferably 160 ° C or higher. When the heat-resistant temperature of the rupture film is 120° C. or higher, it is determined that when the stretched porous film of the second embodiment of the present invention is laminated and laminated with another member, the film does not cause heat due to a heat-fusible adhesive or the like. In the case of rupture of the film, the necessary heat resistance is imparted to the extended porous film.
Here, regarding the heat-resistant temperature of the rupture film, the sample (100 mm × 100 mm) is held by two circular stainless steel plates (100 mm × 100 mm × 2 mm (thickness)) punched out at a center of Φ 50 mm. The four sides were fixed by a clip, and after standing in a convection oven at a temperature of 120 ° C for 2 minutes in the tank and heated, whether the sample of the round punched portion of the stainless steel plate was melted or perforated, and the situation was visually judged. The rupture-free or perforated person is set to have a heat-resistant temperature of 120 ° C or higher. In addition, when the temperature in the tank was changed to 140 ° C and 160 ° C and the same evaluation was carried out, the crack-free heat resistance temperature was set to 140 ° C or higher and 160 ° C or higher, respectively.

以下，對構成本發明的延伸多孔膜的樹脂組成物（Z）進行說明後，對延伸多孔膜的製造方法進行說明。再者，「本發明的延伸多孔膜」是指所述「本發明的第1實施形態的延伸多孔膜」及「本發明的第2實施形態的延伸多孔膜」。Hereinafter, the resin composition (Z) constituting the expanded porous film of the present invention will be described, and then a method for producing the expanded porous film will be described. In addition, the "extended porous film of the first embodiment of the present invention" and the "extended porous film of the second embodiment of the present invention".

2. 構成延伸多孔膜的樹脂組成物（Z）
本發明的延伸多孔膜重要的是包含含有25質量%～54質量%的熱塑性樹脂、46質量%～75質量%的無機填充材（A）的樹脂組成物（Z）。2. Resin composition constituting the extended porous film (Z)
The stretched porous film of the present invention is important as a resin composition (Z) containing a thermoplastic resin (25% by mass to 54% by mass) and an inorganic filler (A) of 46% by mass to 75% by mass.

2-1. 無機填充材（A）
作為所述無機填充材（A），例如可列舉碳酸鈣、硫酸鈣、碳酸鋇、硫酸鋇、氧化鈦、滑石、黏土、高嶺石（kaolinite）、蒙脫石（montmorillonite）等的微粒子或礦物，就微多孔質化的顯現、通用性之高、低價及品種的豐富性等優點而言，可適宜地使用碳酸鈣、硫酸鋇。2-1. Inorganic filler (A)
Examples of the inorganic filler (A) include fine particles or minerals such as calcium carbonate, calcium sulfate, barium carbonate, barium sulfate, titanium oxide, talc, clay, kaolinite, and montmorillonite. Calcium carbonate and barium sulfate can be suitably used in terms of the appearance of microporosity, high versatility, low cost, and richness of variety.

無機填充材（A）的平均粒徑較佳為0.1 μm～10 μm，更佳為0.3 μm～5 μm，進而佳為0.5 μm～3 μm。若平均粒徑為0.1 μm以上，則無機填充材（A）的分散不良或二次凝聚得到抑制，可均勻地分散於樹脂組成物（Z）中，因此較佳。另一方面，若平均粒徑為10 μm以下，則於膜的薄膜化時可抑制產生大的孔隙，從而可對膜確保充分的強度與耐水性。另外，以提高與樹脂的分散性及混合性為目的，較佳為預先將脂肪酸、脂肪酸酯等塗佈於無機填充材，並使無機填充材表面與樹脂容易地融合，於本發明所使用的無機填充材（A）中，亦能夠使用經表面處理的無機填充材。The average particle diameter of the inorganic filler (A) is preferably from 0.1 μm to 10 μm, more preferably from 0.3 μm to 5 μm, still more preferably from 0.5 μm to 3 μm. When the average particle diameter is 0.1 μm or more, dispersion or secondary aggregation of the inorganic filler (A) is suppressed, and it can be uniformly dispersed in the resin composition (Z), which is preferable. On the other hand, when the average particle diameter is 10 μm or less, it is possible to suppress generation of large pores at the time of film formation, and it is possible to secure sufficient strength and water resistance to the film. Further, for the purpose of improving the dispersibility and the miscibility of the resin, it is preferred to apply a fatty acid, a fatty acid ester or the like to the inorganic filler in advance, and to fuse the surface of the inorganic filler with the resin, and to use it in the present invention. In the inorganic filler (A), a surface-treated inorganic filler can also be used.

2-2. 熱塑性樹脂
作為所述熱塑性樹脂，可列舉：聚烯烴系樹脂、聚苯乙烯系樹脂、丙烯酸系樹脂、聚氯乙烯系樹脂、聚偏二氯乙烯系樹脂、氯化聚乙烯系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、聚醯胺系樹脂、乙烯/乙烯醇系共聚物、乙烯/乙酸乙烯酯系共聚物、聚甲基戊烯系樹脂、聚乙烯醇系樹脂、環狀烯烴系樹脂、聚乳酸系樹脂、聚丁二酸丁二醇酯（polybutylene succinate）系樹脂、聚丙烯腈系樹脂、聚環氧乙烷系樹脂、纖維素系樹脂、聚醯亞胺系樹脂、聚胺基甲酸酯系樹脂、聚苯硫醚系樹脂、聚苯醚系樹脂、聚乙烯縮醛系樹脂、聚丁二烯系樹脂、聚丁烯系樹脂、聚醯胺醯亞胺系樹脂、聚醯胺雙馬來醯亞胺系樹脂、聚芳酯系樹脂、聚醚醯亞胺系樹脂、聚醚醚酮系樹脂、聚醚酮系樹脂、聚醚碸系樹脂、聚酮系樹脂、聚碸系樹脂、芳族聚醯胺系樹脂、氟系樹脂、聚縮醛系樹脂等。其中，就柔軟性、耐熱性、連通孔的形成、環境衛生性、臭氣等觀點而言，作為所述熱塑性樹脂，較佳為聚烯烴系樹脂。
所述熱塑性樹脂可為一種，亦可為兩種以上。於所述熱塑性樹脂包含兩種以上的情況下，其合計成為所述熱塑性樹脂的質量，算出樹脂組成物（Z）中的所述熱塑性樹脂的質量比率。2-2. Thermoplastic Resin The thermoplastic resin may, for example, be a polyolefin resin, a polystyrene resin, an acrylic resin, a polyvinyl chloride resin, a polyvinylidene chloride resin, or a chlorinated polyethylene resin. Polyester resin, polycarbonate resin, polyamine resin, ethylene/vinyl alcohol copolymer, ethylene/vinyl acetate copolymer, polymethylpentene resin, polyvinyl alcohol resin, ring Olefin-based resin, polylactic acid-based resin, polybutylene succinate resin, polyacrylonitrile resin, polyethylene oxide resin, cellulose resin, polyimine resin , a polyurethane resin, a polyphenylene sulfide resin, a polyphenylene ether resin, a polyvinyl acetal resin, a polybutadiene resin, a polybutene resin, a polyamidoximine system Resin, polyamine amine bismaleimide resin, polyarylate resin, polyether oxime resin, polyether ether ketone resin, polyether ketone resin, polyether oxime resin, polyketone system Resin, polyfluorene-based resin, aromatic polyamine resin, fluorine tree , Polyacetal resin or the like. In particular, the thermoplastic resin is preferably a polyolefin resin from the viewpoints of flexibility, heat resistance, formation of a communication hole, environmental hygiene, odor, and the like.
The thermoplastic resin may be one type or two or more types. When two or more types of the thermoplastic resin are contained, the total mass of the thermoplastic resin is calculated, and the mass ratio of the thermoplastic resin in the resin composition (Z) is calculated.

所謂聚烯烴系樹脂，是將烯烴單體作為主要的單體成分的樹脂。所謂主要的單體成分，是指於樹脂中佔50莫耳%以上且100莫耳%以下的單體成分。作為烯烴單體，可列舉乙烯、丙烯，另外可列舉1-丁烯、1-己烯、4-甲基-1-戊烯、1-辛烯等α-烯烴、或二烯、異戊二烯、丁烯、丁二烯等，可為該些的均聚物，亦可為將兩種以上共聚而成的多元共聚物。另外，亦可為將乙酸乙烯酯、(甲基)丙烯酸、(甲基)丙烯酸酯、(甲基)丙烯酸縮水甘油酯、乙烯醇、乙二醇、馬來酸酐、苯乙烯、二烯、環狀烯烴共聚而成者。其中，就賦予柔軟性與手感的觀點而言，較佳為乙烯均聚物、分支狀低密度聚乙烯、乙烯/α-烯烴共聚物、乙烯/乙酸乙烯酯共聚物、苯乙烯/乙烯/丙烯共聚物、苯乙烯/乙烯/丁烯共聚物。The polyolefin resin is a resin having an olefin monomer as a main monomer component. The main monomer component means a monomer component which accounts for 50 mol% or more and 100 mol% or less in the resin. Examples of the olefin monomer include ethylene and propylene, and examples thereof include an α-olefin such as 1-butene, 1-hexene, 4-methyl-1-pentene or 1-octene, or a diene or isoprene. The olefin, butene, butadiene or the like may be a homopolymer of these or a multicomponent copolymer obtained by copolymerizing two or more kinds. In addition, vinyl acetate, (meth)acrylic acid, (meth) acrylate, glycidyl (meth) acrylate, vinyl alcohol, ethylene glycol, maleic anhydride, styrene, diene, ring may also be used. Copolymerized olefins. Among them, from the viewpoint of imparting flexibility and hand feeling, ethylene homopolymer, branched low density polyethylene, ethylene/α-olefin copolymer, ethylene/vinyl acetate copolymer, styrene/ethylene/propylene are preferable. Copolymer, styrene/ethylene/butene copolymer.

於所述熱塑性樹脂為聚烯烴系樹脂的情況下，若為將烯烴單體作為主要的單體成分的樹脂，則可為一種，亦可為兩種以上。於所述聚烯烴系樹脂包含兩種以上的情況下，其合計成為所述聚烯烴系樹脂的質量。In the case where the thermoplastic resin is a polyolefin-based resin, the resin may be one type or two or more types of the resin having the olefin monomer as a main monomer component. When two or more types of the polyolefin-based resin are contained, the total amount of the polyolefin-based resin is the mass of the polyolefin-based resin.

另外，於所述熱塑性樹脂為聚烯烴系樹脂的情況下，較佳為所述聚烯烴系樹脂的密度為0.850 g/cm³ 以上且0.940 g/cm³ 以下。另外，作為所述聚烯烴系樹脂，較佳為分別具有密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B）、及密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C）。Further, when the thermoplastic resin is a polyolefin resin, the polyolefin resin preferably has a density of 0.850 g/cm ³ or more and 0.940 g/cm ³ or less. Moreover, it is preferable that the polyolefin-based resin has a polyethylene resin (B) having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less, and a density of 0.850 g/cm ³ or more and not A soft polyolefin resin (C) of 0.910 g/cm ^{3 or} more.

2-2-1. 聚乙烯系樹脂（B）
所述聚乙烯系樹脂（B）是密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下、並將乙烯作為主要的單體成分的樹脂。所謂主要的單體成分，是指於樹脂中佔50莫耳%以上且100莫耳%以下的單體成分。因而，聚乙烯系樹脂（B）可為乙烯均聚物，亦可為將乙烯作為主要的單體成分且含有其他單體的共聚物。若對共聚物的例子進行列舉，則可列舉乙烯/丙烯共聚物、乙烯/1-丁烯共聚物、乙烯/1-己烯共聚物、乙烯/4-甲基-1-戊烯共聚物、乙烯/1-辛烯共聚物等乙烯/α-烯烴共聚物，或者，另外可列舉乙烯/乙酸乙烯酯共聚物、乙烯/(甲基)丙烯酸共聚物、乙烯/(甲基)丙烯酸酯共聚物、乙烯/(甲基)丙烯酸縮水甘油酯、乙烯/乙烯醇共聚物、乙烯/乙二醇共聚物、乙烯/馬來酸酐共聚物、乙烯/苯乙烯共聚物、乙烯/二烯共聚物、乙烯/環狀烯烴共聚物等。亦可為乙烯/丙烯/1-丁烯共聚物等含有兩種以上的所述單體成分的多元共聚物。
所述之中，就耐熱收縮性與尺寸穩定性的觀點而言，較佳為乙烯均聚物、或乙烯/α-烯烴共聚物。2-2-1. Polyethylene resin (B)
The polyethylene-based resin (B) is a resin having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less and ethylene as a main monomer component. The main monomer component means a monomer component which accounts for 50 mol% or more and 100 mol% or less in the resin. Therefore, the polyethylene-based resin (B) may be an ethylene homopolymer or a copolymer containing ethylene as a main monomer component and containing another monomer. Examples of the copolymer include an ethylene/propylene copolymer, an ethylene/1-butene copolymer, an ethylene/1-hexene copolymer, and an ethylene/4-methyl-1-pentene copolymer. An ethylene/α-olefin copolymer such as an ethylene/1-octene copolymer, or alternatively, an ethylene/vinyl acetate copolymer, an ethylene/(meth)acrylic copolymer, or an ethylene/(meth)acrylate copolymer , ethylene/glycidyl (meth)acrylate, ethylene/vinyl alcohol copolymer, ethylene/ethylene glycol copolymer, ethylene/maleic anhydride copolymer, ethylene/styrene copolymer, ethylene/diene copolymer, ethylene / cyclic olefin copolymer and the like. Further, it may be a multicomponent copolymer containing two or more kinds of the monomer components, such as an ethylene/propylene/1-butene copolymer.
Among these, from the viewpoint of heat shrinkage resistance and dimensional stability, an ethylene homopolymer or an ethylene/α-olefin copolymer is preferred.

所述聚乙烯系樹脂（B）若為密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下、且將乙烯作為主要的單體成分的樹脂，則可為一種，亦可為兩種以上。於所述聚乙烯系樹脂（B）包含兩種以上的情況下，其合計成為所述聚乙烯系樹脂（B）的質量。
藉由包含密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B），能夠滿足延伸多孔膜的通氣性、透濕性、耐熱收縮性、尺寸穩定性、耐漏液性、隱蔽性、外觀等。聚乙烯系樹脂（B）的密度更佳為0.910 g/cm³ 以上且0.937 g/cm³ 以下，特佳為0.910 g/cm³ 以上且0.935 g/cm³ 以下。此處，密度為藉由比重計（pycnometer）法（JIS K7112 B法）測定所得的密度。另外，為對後述樹脂的密度亦同樣地測定時的值。When the polyethylene resin (B) has a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less and ethylene is a main monomer component, one type may be used, or two or more types may be used. . When two or more types of the polyethylene-based resin (B) are contained, the total amount of the polyethylene-based resin (B) is the mass of the polyethylene-based resin (B).
By including the polyethylene resin (B) having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less, the air permeability, moisture permeability, heat shrinkage resistance, dimensional stability, and liquid leakage resistance of the extended porous film can be satisfied. Sex, concealment, appearance, etc. Density polyethylene resin (B) is more preferably 0.910 g / cm ³ or more and 0.937 g / cm ³ or less, and particularly preferably 0.910 g / cm ³ or more and 0.935 g / cm ³ or less. Here, the density is a density measured by a pycnometer method (JIS K7112 B method). In addition, it is a value measured similarly to the density of the resin mentioned later.

聚乙烯系樹脂（B）可為線狀，亦可為分支狀。聚乙烯系樹脂（B）的製造方法並無特別限定，可列舉使用公知的烯烴聚合用觸媒的公知的聚合方法，例如使用以戚格勒-納他（Ziegler-Natta）型觸媒為代表的多位點（multi-site）觸媒、或以茂金屬系觸媒為代表的單位點（single-site）觸媒的聚合方法等。The polyethylene resin (B) may be in the form of a line or a branch. The method for producing the polyethylene resin (B) is not particularly limited, and a known polymerization method using a known catalyst for olefin polymerization, for example, a Ziegler-Natta type catalyst is used. A multi-site catalyst or a polymerization method of a single-site catalyst represented by a metallocene catalyst.

較佳為聚乙烯系樹脂（B）的至少一種為分支狀低密度聚乙烯。於聚乙烯系樹脂（B）的至少一種為分支狀低密度聚乙烯的情況下，樹脂組成物（Z）的熔融張力上升，且成形加工性提高，因此較佳。另外，分支狀低密度聚乙烯的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）的值於0℃～30℃下顯示出大的值，因此，較佳為所述聚乙烯系樹脂（B）的至少一種為分支狀低密度聚乙烯。It is preferable that at least one of the polyethylene-based resins (B) is a branched low-density polyethylene. When at least one of the polyethylene-based resin (B) is a branched low-density polyethylene, the melt tension of the resin composition (Z) increases, and the moldability is improved, which is preferable. Further, the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the branched low-density polyethylene to the loss elastic modulus (E''), that is, the value of tan δ (=E''/E') is 0. At a temperature of from ° C to 30 ° C, a large value is exhibited. Therefore, at least one of the polyethylene-based resins (B) is preferably a branched low-density polyethylene.

所述聚乙烯系樹脂（B）的熔點較佳為110℃～135℃，更佳為110℃～130℃。若所述聚乙烯系樹脂（B）的熔點為110℃～135℃，則可提高延伸多孔膜的耐熱收縮性、尺寸穩定性，因此較佳。
此處，關於熔點，為根據利用示差掃描型熱量計（DSC）將樹脂約10 mg以加熱速度10℃/分鐘自-40℃升溫至200℃，於200℃下保持1分鐘後，以冷卻速度10℃/分鐘降溫至-40℃，並再次以加熱速度10℃/分鐘升溫至200℃時所測定的熱譜圖（thermogram）而求出的結晶熔融峰值溫度（Tm）（℃）。另外，為對後述樹脂的熔點亦同樣地測定時的值。The melting point of the polyethylene resin (B) is preferably from 110 ° C to 135 ° C, more preferably from 110 ° C to 130 ° C. When the melting point of the polyethylene-based resin (B) is from 110 ° C to 135 ° C, heat-resistant shrinkage and dimensional stability of the stretched porous film can be improved, which is preferable.
Here, regarding the melting point, the temperature is raised from -40 ° C to 200 ° C at a heating rate of 10 ° C / min by a differential scanning calorimeter (DSC), and maintained at 200 ° C for 1 minute, at a cooling rate. The crystal melting peak temperature (Tm) (° C.) obtained by lowering the temperature to -40 ° C at 10 ° C /min and again raising the temperature to 200 ° C at a heating rate of 10 ° C / min. In addition, it is a value measured similarly to the melting point of the resin mentioned later.

所述聚乙烯系樹脂（B）的熔體流動速率（melt flow rate，MFR）較佳為0.1 g/10分鐘～20 g/10分鐘，更佳為0.5 g/10分鐘～10 g/10分鐘。藉由將MFR設為0.1 g/10分鐘以上，可充分地保持延伸多孔膜的成形性，因此較佳。另外，藉由將MFR設為20 g/10分鐘以下，可充分地保持延伸多孔膜的強度，因此較佳。
此處，MFR是依據JIS K7219測定所得的值，其測定條件為190℃、2.16 kg負荷。The melt flow rate (MFR) of the polyethylene-based resin (B) is preferably from 0.1 g/10 min to 20 g/10 min, more preferably from 0.5 g/10 min to 10 g/10 min. . By setting the MFR to 0.1 g/10 minutes or more, the formability of the stretched porous film can be sufficiently maintained, which is preferable. Further, by setting the MFR to 20 g/10 minutes or less, the strength of the stretched porous film can be sufficiently maintained, which is preferable.
Here, MFR is a value measured based on JIS K7219, and the measurement conditions are 190 ° C and a load of 2.16 kg.

2-2-2. 軟質聚烯烴系樹脂（C）
所述軟質聚烯烴系樹脂（C）是密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 、並將烯烴單體作為主要的單體成分的樹脂。所謂主要的單體成分，是指於樹脂中佔50莫耳%以上且100莫耳%以下的單體成分。作為烯烴單體，可列舉乙烯、丙烯，另外可列舉1-丁烯、1-己烯、4-甲基-1-戊烯、1-辛烯等α-烯烴、或二烯、異戊二烯、丁烯、丁二烯等，可為該些的均聚物，亦可為將兩種以上共聚而成的多元共聚物。另外，亦可為將乙酸乙烯酯、(甲基)丙烯酸、(甲基)丙烯酸酯、(甲基)丙烯酸縮水甘油酯、乙烯醇、乙二醇、馬來酸酐、苯乙烯、二烯、環狀烯烴共聚而成者。其中，就賦予柔軟性與手感的觀點而言，較佳為乙烯均聚物、分支狀低密度聚乙烯、乙烯/α-烯烴共聚物、乙烯/乙酸乙烯酯共聚物、苯乙烯/乙烯/丙烯共聚物、苯乙烯/乙烯/丁烯共聚物。2-2-2. Soft polyolefin resin (C)
The soft polyolefin-based resin (C) is a resin having a density of 0.850 g/cm ³ or more and less than 0.910 g/cm ³ and an olefin monomer as a main monomer component. The main monomer component means a monomer component which accounts for 50 mol% or more and 100 mol% or less in the resin. Examples of the olefin monomer include ethylene and propylene, and examples thereof include an α-olefin such as 1-butene, 1-hexene, 4-methyl-1-pentene or 1-octene, or a diene or isoprene. The olefin, butene, butadiene or the like may be a homopolymer of these or a multicomponent copolymer obtained by copolymerizing two or more kinds. In addition, vinyl acetate, (meth)acrylic acid, (meth) acrylate, glycidyl (meth) acrylate, vinyl alcohol, ethylene glycol, maleic anhydride, styrene, diene, ring may also be used. Copolymerized olefins. Among them, from the viewpoint of imparting flexibility and hand feeling, ethylene homopolymer, branched low density polyethylene, ethylene/α-olefin copolymer, ethylene/vinyl acetate copolymer, styrene/ethylene/propylene are preferable. Copolymer, styrene/ethylene/butene copolymer.

所述軟質聚烯烴系樹脂（C）若為密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 、並將烯烴單體作為主要的單體成分的樹脂，則可為一種，亦可為兩種以上。於所述軟質聚烯烴系樹脂（C）包含兩種以上的情況下，其合計成為所述軟質聚烯烴系樹脂（C）的質量。藉由包含密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C），可改善延伸多孔膜的柔軟性或手感，並提高觸感的滿足度。另外，軟質聚烯烴系樹脂（C）的密度較佳為0.855 g/cm³ 以上且未滿0.910 g/cm³ ，更佳為0.860 g/cm³ 以上且未滿0.910 g/cm³ 。The soft polyolefin-based resin (C) may be one which has a density of 0.850 g/cm ³ or more and less than 0.910 g/cm ³ and an olefin monomer as a main monomer component. There are two or more. When two or more types of the soft polyolefin-based resin (C) are contained, the total amount of the soft polyolefin-based resin (C) is the mass of the soft polyolefin-based resin (C). By including the soft polyolefin-based resin (C) having a density of 0.850 g/cm ³ or more and less than 0.910 g/cm ³ , the flexibility or texture of the stretched porous film can be improved, and the satisfaction of the touch feeling can be improved. Further, the density of the soft polyolefin-based resin (C) is preferably 0.855 g/cm ³ or more and less than 0.910 g/cm ³ , more preferably 0.860 g/cm ³ or more and less than 0.910 g/cm ³ .

所述軟質聚烯烴系樹脂（C）的熔體流動速率（MFR）較佳為0.1 g/10分鐘～20 g/10分鐘，更佳為0.5 g/10分鐘～10 g/10分鐘。藉由將MFR設為0.1 g/10分鐘以上，可充分地保持延伸多孔膜的成形性，因此較佳。另外，藉由將MFR設為20 g/10分鐘以下，可充分地保持延伸多孔膜的強度，因此較佳。The soft polyolefin resin (C) preferably has a melt flow rate (MFR) of from 0.1 g/10 min to 20 g/10 min, more preferably from 0.5 g/10 min to 10 g/10 min. By setting the MFR to 0.1 g/10 minutes or more, the formability of the stretched porous film can be sufficiently maintained, which is preferable. Further, by setting the MFR to 20 g/10 minutes or less, the strength of the stretched porous film can be sufficiently maintained, which is preferable.

另外，所述軟質聚烯烴系樹脂（C）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）的峰值較佳為處於-50℃～50℃的範圍內。於所述軟質聚烯烴系樹脂（C）的tanδ的峰值處於-50℃～50℃的範圍內的情況下，有助於抑制沙沙、硬邦邦之類的不舒適的聲音，因此較佳。Further, the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the soft polyolefin-based resin (C) to the loss elastic modulus (E'') is tan δ (=E''/E') The peak value is preferably in the range of -50 ° C to 50 ° C. When the peak value of tan δ of the soft polyolefin-based resin (C) is in the range of -50 ° C to 50 ° C, it is preferable to suppress an unpleasant sound such as rustle or hard state.

另外，所述軟質聚烯烴系樹脂（C）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）的峰值較佳為0.100以上，更佳為0.200以上，進而佳為0.300以上。於所述軟質聚烯烴系樹脂（C）的tanδ的峰值為0.100以上的情況下，有助於抑制沙沙、硬邦邦之類的不舒適的聲音，因此較佳。Further, the ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the soft polyolefin-based resin (C) to the loss elastic modulus (E'') is tan δ (=E''/E') The peak value is preferably 0.100 or more, more preferably 0.200 or more, and still more preferably 0.300 or more. When the peak value of tan δ of the soft polyolefin-based resin (C) is 0.100 or more, it is preferable because it contributes to suppressing uncomfortable sound such as rustle and hard state.

所述熱塑性樹脂為聚烯烴系樹脂，於所述聚烯烴系樹脂分別具有密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B）、及密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C）的情況下，所述無機填充材（A）、所述聚乙烯系樹脂（B）、及所述軟質聚烯烴系樹脂（C）的混合組成比較佳為（A）/（B）/（C）=50質量%～75質量%/1質量%～45質量%/1質量%～45質量%（其中，將（A）與（B）與（C）的合計質量%設為100質量%。），更佳為（A）/（B）/（C）=50質量%～70質量%/3質量%～43質量%/3質量%～43質量%。The thermoplastic resin is a polyolefin-based resin, and each of the polyolefin-based resins has a polyethylene resin (B) having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less, and a density of 0.850 g/cm. ^In the case of the soft polyolefin resin (C) of ³ or more and less than 0.910 g/cm ³ , the inorganic filler (A), the polyethylene resin (B), and the soft polyolefin resin The mixed composition of (C) is preferably (A) / (B) / (C) = 50% by mass to 75% by mass / 1% by mass to 45% by mass / 1% by mass to 45% by mass (wherein (A) The total mass % of (B) and (C) is 100% by mass.), more preferably (A) / (B) / (C) = 50% by mass to 70% by mass / 3% by mass to 43% by mass %/3 mass% to 43 mass%.

於所述無機填充材（A）與所述聚乙烯系樹脂（B）與所述軟質聚烯烴系樹脂（C）的混合組成比中，所述無機填充材（A）的混合組成比為所述較佳範圍內的下限以上的情況下，伴隨延伸的多孔的形成變得充分，且容易形成連通孔，容易表現出充分的透氣特性或透濕特性。
另外，於所述無機填充材（A）的混合組成比為所述較佳範圍內的上限以下的情況下，樹脂組成物的成形變得容易，從而生產性不存在問題。
另外，於所述聚乙烯系樹脂（B）的混合組成比為所述較佳範圍內的下限以上、且所述軟質聚烯烴系樹脂（C）的混合組成比為所述較佳範圍內的上限以下的情況下，成為耐熱收縮性或尺寸穩定性優異的膜。
進而，於所述聚乙烯系樹脂（B）的混合組成比為所述較佳範圍內的上限以下、且所述軟質聚烯烴系樹脂（C）的混合組成比為所述較佳範圍內的下限以上的情況下，可獲得柔軟性或手感之類的皮膚接觸良好的觸感，並容易抑制於膜摩擦時所產生的不舒適聲音。In the mixing composition ratio of the inorganic filler (A) and the polyethylene resin (B) and the soft polyolefin resin (C), the mixing composition ratio of the inorganic filler (A) is When the lower limit is more than the lower limit in the preferred range, the formation of the porous body is sufficient, and the communication hole is easily formed, and it is easy to exhibit sufficient gas permeability or moisture permeability.
In addition, when the mixing composition ratio of the inorganic filler (A) is at most the upper limit of the above preferred range, molding of the resin composition is easy, and there is no problem in productivity.
In addition, the mixing composition ratio of the polyethylene-based resin (B) is at least the lower limit of the preferred range, and the mixing composition ratio of the soft polyolefin-based resin (C) is within the preferred range. When it is less than the upper limit, it is a film excellent in heat shrinkability and dimensional stability.
Furthermore, the mixing composition ratio of the polyethylene resin (B) is not more than the upper limit of the preferred range, and the mixing composition ratio of the soft polyolefin resin (C) is within the preferred range. When the lower limit is equal to or higher than the lower limit, it is possible to obtain a good touch with good skin contact such as softness and hand feeling, and it is easy to suppress an uncomfortable sound generated when the film is rubbed.

另一方面，作為所述聚烯烴系樹脂，除了密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B）、及密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C）以外，亦可具有後述聚丙烯系樹脂（D）。On the other hand, the polyolefin-based resin is a polyethylene-based resin (B) having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less, and a density of 0.850 g/cm ³ or more and less than 0.910. In addition to the soft polyolefin resin (C) of g/cm ³ , a polypropylene resin (D) to be described later may be provided.

＜聚丙烯系樹脂（D）＞
聚丙烯系樹脂（D）的密度較佳為0.890 g/cm³ 以上且未滿0.910 g/cm³ 。另外，熔點較佳為140℃～170℃。另外，MFR較佳為10 g/10 min～50 g/10 min。此處，聚丙烯系樹脂（D）的MFR是依據JIS K7210的條件M測定所得的值，所述測定條件為230℃、2.16 kg負荷。<Polypropylene resin (D)>
The density of the polypropylene resin (D) is preferably 0.890 g/cm ³ or more and less than 0.910 g/cm ³ . Further, the melting point is preferably from 140 ° C to 170 ° C. Further, the MFR is preferably from 10 g/10 min to 50 g/10 min. Here, the MFR of the polypropylene resin (D) is a value measured in accordance with Condition M of JIS K7210, and the measurement conditions are 230 ° C and a load of 2.16 kg.

所述熱塑性樹脂為聚烯烴系樹脂，於所述聚烯烴系樹脂分別具有密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B）、密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C）、聚丙烯系樹脂（D）的情況下，所述聚乙烯系樹脂（B）、所述軟質聚烯烴系樹脂（C）、所述聚丙烯系樹脂（D）的混合組成比較佳為（B）/（C）/（D）=1質量%～25質量%/50質量%～98質量%/1質量%～25質量%（其中，將（B）與（C）與（D）的合計質量%設為100質量%。），更佳為（B）/（C）/（D）=5質量%～20質量%/60質量%～90質量%/5質量%～20質量%（其中，將（B）與（C）與（D）的合計質量%設為100質量%。）。The thermoplastic resin is a polyolefin-based resin, and each of the polyolefin-based resins has a polyethylene resin (B) having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less, and a density of 0.850 g/cm ^{3 .} In the case of the soft polyolefin resin (C) or the polypropylene resin (D) which is less than 0.910 g/cm ³ or more, the polyethylene resin (B) and the soft polyolefin resin (C) The mixed composition of the polypropylene resin (D) is preferably (B) / (C) / (D) = 1% by mass to 25% by mass / 50% by mass to 98% by mass / 1% by mass to 25 % by mass % (wherein the total mass % of (B) and (C) and (D) is 100% by mass.), more preferably (B) / (C) / (D) = 5 mass% to 20 mass% /60% by mass to 90% by mass / 5% by mass to 20% by mass (wherein the total mass % of (B) and (C) and (D) is 100% by mass.).

於所述聚乙烯系樹脂（B）與所述軟質聚烯烴系樹脂（C）與所述聚丙烯系樹脂（D）的混合組成比中，所述聚丙烯系樹脂（D）的混合組成比為所述較佳範圍內的下限以上的情況下，延伸多孔膜容易表現出充分的耐熱性。
另外，於所述聚乙烯系樹脂（B）的混合組成比為所述較佳範圍內的下限以上的情況下，樹脂組成物的成形變得容易，從而生產性不存在問題。
進而，於所述聚丙烯系樹脂（D）的混合組成比為所述較佳範圍內的上限以下、且所述聚乙烯系樹脂（B）的混合組成比為所述較佳範圍內的上限以下、且所述軟質聚烯烴系樹脂（C）的混合組成比為所述較佳範圍內的下限以上的情況下，可獲得柔軟性或手感之類的皮膚接觸良好的觸感，並容易抑制於膜摩擦時所產生的不舒適聲音。In the mixed composition ratio of the polyethylene resin (B) and the soft polyolefin resin (C) and the polypropylene resin (D), the mixed composition ratio of the polypropylene resin (D) In the case of the lower limit or more in the above preferred range, the stretched porous film easily exhibits sufficient heat resistance.
In addition, when the mixing composition ratio of the polyethylene-based resin (B) is at least the lower limit of the above preferred range, the formation of the resin composition is easy, and there is no problem in productivity.
Further, the mixing composition ratio of the polypropylene resin (D) is not more than the upper limit of the preferred range, and the mixing composition ratio of the polyethylene resin (B) is the upper limit of the preferred range. When the mixing ratio of the soft polyolefin-based resin (C) is at least the lower limit of the above preferred range, a good touch such as softness or texture can be obtained, and it is easy to suppress. Uncomfortable sound produced when the film is rubbed.

2-3. 其他成分
進而，本發明的延伸多孔膜較佳為於所述樹脂組成物（Z）中包含0.1質量%～8.0質量%的塑化劑（E）。若塑化劑（E）包含0.1質量%以上，則所述樹脂組成物（Z）的tanδ的值變大，進而可使所述樹脂組成物（Z）的tanδ的峰值寬度變寬。另外，可減小延伸多孔膜的結晶熔融焓（ΔHm）。另一方面，若塑化劑（E）為8.0質量%以下，則可抑制塑化劑的滲出，並可抑制將延伸多孔膜捲取成輥狀時的結塊、或印刷時的印刷不良。2-3. Other components Further, the expanded porous film of the present invention preferably contains 0.1% by mass to 8.0% by mass of the plasticizer (E) in the resin composition (Z). When the plasticizer (E) is contained in an amount of 0.1% by mass or more, the value of tan δ of the resin composition (Z) is increased, and the peak width of tan δ of the resin composition (Z) can be made wider. In addition, the crystal melting enthalpy (ΔHm) of the elongated porous film can be reduced. On the other hand, when the plasticizer (E) is 8.0% by mass or less, bleeding of the plasticizer can be suppressed, and agglomeration when the expanded porous film is wound into a roll shape or printing failure at the time of printing can be suppressed.

作為塑化劑（E），可列舉下述酯系塑化劑。可使用具有極性結構的酯系塑化劑，例如一價羧酸酯系塑化劑（可列舉藉由丁酸、異丁酸、己酸、2-乙基己酸、庚酸、辛酸、2-乙基己酸、月桂酸等一元羧酸、與乙二醇、二乙二醇、三乙二醇、四乙二醇、聚乙二醇、甘油等多元醇的縮合反應而獲得的化合物。若例示具體的化合物，則為三乙二醇二2-乙基己酸酯、三乙二醇二異丁酸酯、三乙二醇-己酸酯、三乙二醇二2-乙基丁酸酯、三乙二醇二月桂酸酯、乙二醇二2-乙基己酸酯、二乙二醇二2-乙基己酸酯、四乙二醇二2-乙基己酸酯、四乙二醇二庚酸酯、PEG#400二2-乙基己酸酯、三乙二醇單2-乙基己酸酯、甘油三2-乙基己酸酯、季戊四醇四硬脂酸酯、二季戊四醇六辛酸酯、二甘油四硬脂酸酯、二甘油二硬脂酸酯等）、多元羧酸酯系塑化劑（可列舉藉由己二酸、琥珀酸、壬二酸、癸二酸、鄰苯二甲酸、間苯二甲酸、對苯二甲酸、偏苯三甲酸等多元羧酸、與甲醇、乙醇、丁醇、己醇、2-乙基丁醇、庚醇、辛醇、2-乙基己醇、癸醇、十二烷醇、丁氧基乙醇、丁氧基乙氧基乙醇、苄醇等碳數1～12的一元醇的縮合反應而獲得的化合物。若例示具體的化合物，則為己二酸二己酯、己二酸二2-乙基己酯、己二酸二庚酯、己二酸二辛酯、己二酸二2-乙基己酯、己二酸二(丁氧基乙酯)、己二酸二(丁氧基乙氧基乙酯)、己二酸單(2-乙基己酯)、鄰苯二甲酸二丁酯、鄰苯二甲酸二己酯、鄰苯二甲酸二(2-乙基丁酯)、鄰苯二甲酸二辛酯、鄰苯二甲酸二(2-乙基己酯)、鄰苯二甲酸苄基丁酯、鄰苯二甲酸二-十二烷基酯、偏苯三甲酸三辛酯等）、羥基羧酸酯系塑化劑（羥基羧酸的一元醇酯；蓖麻油酸甲酯、蓖麻油酸乙酯、蓖麻油酸丁酯、6-羥基己酸甲酯、6-羥基己酸乙酯、6-羥基己酸丁酯、羥基羧酸的多元醇酯；乙二醇二(6-羥基己酸)酯、二乙二醇二(6-羥基己酸)酯、三乙二醇二(6-羥基己酸)酯、3-甲基-1,5-戊二醇二(6-羥基己酸)酯、3-甲基-1,5-戊二醇二(2-羥基丁酸)酯、3-甲基-1,5-戊二醇二(3-羥基丁酸)酯、3-甲基-1,5-戊二醇二(4-羥基丁酸)酯、三乙二醇二(2-羥基丁酸)酯、甘油三(蓖麻油酸)酯、L-酒石酸二(1-(2-乙基己酯))、蓖麻油類等）、聚酯系塑化劑等適當的塑化劑。
作為蓖麻油類，可列舉通常的蓖麻油、精製蓖麻油、硬化蓖麻油及脫水蓖麻油等。另外，作為硬化蓖麻油，可列舉將包含12-羥基十八烷酸與甘油的甘油三酯作為主成分的硬化蓖麻油等。The plasticizer (E) includes the following ester-based plasticizers. An ester type plasticizer having a polar structure such as a monovalent carboxylic acid ester type plasticizer can be used (may be enumerated by butyric acid, isobutyric acid, caproic acid, 2-ethylhexanoic acid, heptanoic acid, caprylic acid, 2 a compound obtained by a condensation reaction of a monocarboxylic acid such as ethylhexanoic acid or lauric acid with a polyhydric alcohol such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol or glycerin. If a specific compound is exemplified, it is triethylene glycol di 2-ethylhexanoate, triethylene glycol diisobutyrate, triethylene glycol-hexanoate, triethylene glycol di 2-ethylbutyl Acid ester, triethylene glycol dilaurate, ethylene glycol di 2-ethylhexanoate, diethylene glycol di 2-ethylhexanoate, tetraethylene glycol di 2-ethylhexanoate, Tetraethylene glycol diheptanoate, PEG#400 di 2-ethylhexanoate, triethylene glycol mono 2-ethylhexanoate, glycerol triethyl 2-ethylhexanoate, pentaerythritol tetrastearate , dipentaerythritol hexa-octanoate, diglyceryl tetrastearate, diglyceryl distearate, etc.), polycarboxylate plasticizer (may be exemplified by adipic acid, succinic acid, sebacic acid, hydrazine Diacid, phthalic acid, isophthalic acid , polycarboxylic acid such as terephthalic acid, trimellitic acid, and methanol, ethanol, butanol, hexanol, 2-ethylbutanol, heptanol, octanol, 2-ethylhexanol, decyl alcohol, ten a compound obtained by a condensation reaction of a monohydric alcohol having 1 to 12 carbon atoms such as a dialkyl alcohol, a butoxyethanol, a butoxyethoxyethanol or a benzyl alcohol. If a specific compound is exemplified, it is a dihexyl adipate. , di-2-ethylhexyl adipate, diheptyl adipate, dioctyl adipate, di-2-ethylhexyl adipate, di(butoxyethyl) adipate, Di(butoxyethoxyethyl) diacid, mono(2-ethylhexyl) adipate, dibutyl phthalate, dihexyl phthalate, phthalic acid di(2) -ethylbutyl ester), dioctyl phthalate, di(2-ethylhexyl) phthalate, benzyl butyl phthalate, di-dodecyl phthalate, Trioctyl trimellitate, etc.), hydroxycarboxylate plasticizer (monohydric alcohol ester of hydroxycarboxylic acid; methyl ricinoleate, ethyl ricinoleate, butyl ricinoleate, 6-hydroxycaproic acid Methyl ester, ethyl 6-hydroxycaproate, butyl 6-hydroxycaproate, hydroxyl Polyol ester of carboxylic acid; ethylene glycol bis(6-hydroxycaproic acid) ester, diethylene glycol bis(6-hydroxycaproic acid) ester, triethylene glycol bis(6-hydroxyhexanoate), 3- Methyl-1,5-pentanediol bis(6-hydroxycaproic acid) ester, 3-methyl-1,5-pentanediol bis(2-hydroxybutyrate), 3-methyl-1,5 - pentanediol bis(3-hydroxybutyrate), 3-methyl-1,5-pentanediol bis(4-hydroxybutyrate), triethylene glycol bis(2-hydroxybutyrate), A suitable plasticizer such as triglyceride (ricinoleic acid) ester, L-tartrate bis(1-(2-ethylhexyl)), castor oil, or the like, or a polyester plasticizer.
Examples of the castor oil include castor oil, refined castor oil, hardened castor oil, and dehydrated castor oil. In addition, as the hardened castor oil, hardened castor oil containing a triglyceride of 12-hydroxyoctadecanoic acid and glycerin as a main component, etc. are mentioned.

另外，除所述原料以外，亦可根據使用目的，將其他樹脂原料、或因邊緣等的修整損耗（trimming loss）等而產生的再循環樹脂、相容劑、加工助劑、熔融黏度改良劑、抗氧化劑、抗老化劑、熱穩定劑、光穩定劑、耐候性穩定劑、紫外線吸收劑、中和劑、成核劑、交聯劑、潤滑材料、抗結塊劑、增滑劑、防霧劑、抗菌劑、除臭劑、阻燃劑、抗靜電劑、著色劑及顏料等適當添加於構成本發明的延伸多孔膜的樹脂組成物（Z）中。Further, in addition to the above-mentioned raw materials, other resin raw materials, or trimming loss due to edges or the like may be used depending on the purpose of use, such as recycled resin, compatibilizer, processing aid, and melt viscosity improver. , antioxidants, anti-aging agents, heat stabilizers, light stabilizers, weathering stabilizers, UV absorbers, neutralizers, nucleating agents, crosslinkers, lubricating materials, anti-caking agents, slip agents, anti-static agents An aerosol, an antibacterial agent, a deodorant, a flame retardant, an antistatic agent, a colorant, a pigment, and the like are appropriately added to the resin composition (Z) constituting the expanded porous film of the present invention.

3. 延伸多孔膜的製造方法
本發明的延伸多孔膜的製造方法並無特別限制，可藉由先前公知的方法來製造，但重要的是至少於單軸方向上延伸。
此處，所謂「膜」，具有包括自厚片材至薄膜（thin film）在內的含義。作為膜，可為平面狀、管狀中的任一者，但就生產性（能夠於原料片材的寬度方向上獲取數塊製品）或者能夠於內表面進行印刷的觀點而言，較佳為平面狀。作為平面狀的膜的製造方法，例如可例示如下方法：使用擠出機將所述樹脂組成物熔融並自模頭（die）擠出為膜狀，藉由冷卻輥或氣冷、水冷加以冷卻固化，將所獲得的膜（未延伸膜）至少於單軸方向上延伸後，利用捲取機進行捲取，藉此獲得膜。3. Method for Producing Extended Porous Film The method for producing the expanded porous film of the present invention is not particularly limited, and it can be produced by a conventionally known method, but it is important to extend at least in the uniaxial direction.
Here, the "film" has a meaning including a thick film to a thin film. The film may be either a flat shape or a tubular shape. However, from the viewpoint of productivity (capable of acquiring a plurality of articles in the width direction of the raw material sheet) or printing on the inner surface, it is preferably a flat surface. shape. As a method of producing the planar film, for example, a method in which the resin composition is melted by an extruder and extruded from a die into a film shape, and cooled by a cooling roll or air-cooling or water cooling can be exemplified. After curing, the obtained film (unstretched film) was stretched at least in the uniaxial direction, and then taken up by a coiler, whereby a film was obtained.

另外，作為獲得所述未延伸膜的方法，較佳為將構成本發明的延伸多孔膜的組成物（Z）混合後進行熔融混煉。具體而言，利用轉鼓混合機（tumbler mixer）、混合輥（mixing roll）、班布里混合機（Banbury mixer）、帶式摻合機（ribbon blender）、超級混合機（super mixer）等混合機混合適當的時間之後，使用異向雙軸擠出機、同向雙軸擠出機等擠出機來促進組成物的均勻分散分配。可將T型模頭或圓形模頭等模口連接於擠出機的前端，並將所獲得的樹脂組成物成型為膜狀。另外，亦能夠將拉絲模頭（strand die）連接於混煉機的前端，並藉由絞線切割（strand cutting）、模切（die cutting）等方法暫時顆粒化（pelletizing）之後，將所獲得的顆粒（與視情況追加的組成物一併）導入至單軸擠出機等中，將T型模頭或圓形模頭等模口連接於擠出機的前端，從而成形為膜狀。當成形為膜狀時，較佳為充氣（inflation）成形、管式成形、T型模頭成形等膜成形方法。擠出溫度較佳為180℃～260℃左右，更佳為190℃～250℃。藉由使擠出溫度或剪切的狀態最佳化來控制材料的分散狀態，其對於將以下所述的膜的各種物理特性、機械特性設為所期望的值而言亦有效。Further, as a method of obtaining the unstretched film, it is preferred that the composition (Z) constituting the expanded porous film of the present invention is mixed and then melt-kneaded. Specifically, it is mixed using a tumbler mixer, a mixing roll, a Banbury mixer, a ribbon blender, a super mixer, and the like. After mixing for a suitable period of time, an extruder such as an isotropic twin screw extruder or a co-rotating twin screw extruder is used to promote uniform dispersion distribution of the composition. A die such as a T-die or a circular die may be attached to the front end of the extruder, and the obtained resin composition may be formed into a film shape. Alternatively, a strand die can be attached to the front end of the mixer and temporarily pelletized by strand cutting, die cutting, etc., and then obtained. The pellets (together with the composition added as the case may be) are introduced into a single-axis extruder or the like, and a die such as a T-die or a circular die is joined to the tip end of the extruder to be formed into a film shape. When formed into a film shape, a film forming method such as inflation molding, tubular molding, or T-die molding is preferred. The extrusion temperature is preferably from about 180 ° C to about 260 ° C, more preferably from 190 ° C to 250 ° C. The dispersion state of the material is controlled by optimizing the extrusion temperature or the state of shearing, which is also effective for setting various physical properties and mechanical properties of the film described below to a desired value.

本發明的延伸多孔膜可藉由將所述未延伸膜延伸來製造。例如，使用擠出機將樹脂熔融並自T型模頭或圓形模頭擠出，利用冷卻輥加以冷卻固化，並藉由朝縱向（膜的流動方向、MD）的輥延伸、或朝橫向（與膜的流動方向垂直的方向、MD）的拉幅（tenter）延伸等使其至少於單軸方向上延伸。另外，既可於縱向上延伸後於橫向上延伸，亦可於橫向上延伸後於縱向上延伸。另外，亦可於相同方向上延伸兩次以上。進而，亦可於縱向上延伸後於橫向上延伸，進而於縱向上延伸。另外，亦可藉由同時雙軸延伸機於縱向、橫向上同時延伸。另外，亦可藉由管式成形並藉由內壓將管狀的未延伸膜延伸成放射狀。進而，既可將藉由充氣成形而獲得的管狀的未延伸膜於經折疊的狀態下延伸後，將經折疊的管狀的延伸多孔膜的邊緣裁斷，分成兩片並分別進行捲繞，亦可將經折疊的未延伸膜的邊緣切斷並分成兩片未延伸膜後，分別延伸，並分別進行捲取。The elongated porous film of the present invention can be produced by extending the unstretched film. For example, the resin is melted using an extruder and extruded from a T-die or a circular die, cooled and solidified by a cooling roll, and extended by a roll toward the longitudinal direction (flow direction of the film, MD), or toward the transverse direction. A tenter extension or the like (in a direction perpendicular to the flow direction of the film, MD) extends at least in a uniaxial direction. In addition, it may extend in the longitudinal direction after extending in the longitudinal direction, or may extend in the longitudinal direction after extending in the lateral direction. In addition, it is also possible to extend twice or more in the same direction. Further, it may extend in the longitudinal direction and then extend in the lateral direction to further extend in the longitudinal direction. In addition, it can also be extended simultaneously in the longitudinal direction and the lateral direction by the simultaneous biaxial stretching machine. Alternatively, the tubular unstretched film may be formed into a radial shape by tubular molding and by internal pressure. Further, the tubular unstretched film obtained by inflation molding may be stretched in a folded state, and the edge of the folded tubular elongated porous film may be cut into two pieces and wound separately. After the edges of the folded unstretched film were cut and divided into two unstretched films, they were respectively stretched and separately taken up.

本發明中，較佳為至少於縱向上進行一次延伸，另外，亦可兼顧延伸不均或通氣性而於縱向上進行兩次延伸。延伸溫度較佳為0℃～90℃，更佳為20℃～70℃。另外，延伸倍率較佳為合計1.5倍～6.0倍，更佳為2.0倍～5.0倍。藉由將延伸倍率設為合計1.5倍以上，而被均勻地延伸，並獲得具有優異外觀的延伸多孔膜。另一方面，藉由將延伸倍率設為合計6.0倍以下，可抑制膜的破裂。In the present invention, it is preferred to perform stretching at least once in the longitudinal direction, and it is also possible to perform stretching twice in the longitudinal direction while achieving unevenness in extension or air permeability. The stretching temperature is preferably from 0 ° C to 90 ° C, more preferably from 20 ° C to 70 ° C. Further, the stretching ratio is preferably from 1.5 to 6.0 times, more preferably from 2.0 to 5.0 times. By extending the stretching ratio to 1.5 times or more in total, it is uniformly extended, and an elongated porous film having an excellent appearance is obtained. On the other hand, by setting the stretching ratio to 6.0 times or less in total, cracking of the film can be suppressed.

視需要，以降低熱收縮率或改良各物性等為目的，可於延伸後於50℃以上且120℃以下的溫度下進行熱處理或鬆弛處理。於藉由輥延伸來進行延伸的情況下，於延伸步驟與捲取步驟之間，使延伸後的膜接觸已加熱的輥（退火輥），藉此可進行熱處理。另外，一面藉由退火輥進行加熱，一面使接下來接觸的輥的速度較退火輥速度慢，藉此可進行鬆弛處理。另外，該些熱處理或鬆弛處理亦能夠於將未延伸膜延伸並將延伸多孔膜捲取之後，於其他步驟中進行。若熱處理或鬆弛處理的溫度過低，則有膜的收縮率難以降低之虞，另外，若溫度過高，則有纏繞於輥、或者所形成的微多孔閉塞之虞。因此，較佳為於50℃以上且120℃以下的溫度下進行熱處理或鬆弛處理。該些熱處理、鬆弛處理亦可分為多次來實施。For the purpose of reducing the heat shrinkage rate or improving the physical properties, the heat treatment or the relaxation treatment may be carried out at a temperature of 50 ° C or more and 120 ° C or less after the stretching. In the case where the stretching is performed by the roll extension, the stretched film is brought into contact with the heated roll (annealing roll) between the stretching step and the winding step, whereby heat treatment can be performed. Further, while being heated by the annealing roller, the speed of the next contact roller is made slower than the annealing roller speed, whereby the relaxation treatment can be performed. In addition, the heat treatment or relaxation treatment can also be carried out in other steps after the unstretched film is stretched and the stretched porous film is taken up. When the temperature of the heat treatment or the relaxation treatment is too low, the shrinkage rate of the film is hard to be lowered, and if the temperature is too high, the film is wound around the roll or the microporous occlusion formed. Therefore, it is preferred to carry out heat treatment or relaxation treatment at a temperature of 50 ° C or more and 120 ° C or less. These heat treatments and relaxation treatments can also be carried out in multiple steps.

另外，本發明的延伸多孔膜視需要可實施開縫、電暈處理、印刷、黏接劑的塗佈、塗敷、蒸鍍等表面處理或表面加工等。
[實施例]Further, the expanded porous film of the present invention may be subjected to surface treatment, surface treatment, or the like, such as slitting, corona treatment, printing, application of an adhesive, coating, vapor deposition, or the like, as needed.
[Examples]

以下，藉由實施例來更詳細地說明本發明，但本發明並不限定於該些。再者，實施例所示的測定值及評價是以如下方式進行。實施例中，將膜的流動方向記載為「縱」方向（或MD），將其直角方向記載為「橫」方向（或TD）。Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited thereto. Further, the measured values and evaluations shown in the examples were carried out as follows. In the examples, the flow direction of the film is described as "longitudinal" direction (or MD), and the direction perpendicular to the film is referred to as "lateral" direction (or TD).

（1）構成延伸多孔膜的樹脂組成物（Z）的動態黏彈性測定
於下述示出的實施例、比較例中，使用利用構成延伸多孔膜的樹脂組成物（Z）的未延伸膜並剪裁為MD：4 mm、TD：35 mm而成的長條狀的樣品片，按照所述方法進行動態黏彈性測定，算出儲存彈性係數（E'）、損失彈性係數（E''）、及儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）。然後，將於-20℃下tanδ為0.100以上的情形判定為「A」，將於-20℃下tanδ未滿0.100的情形判定為「B」。
進而，將20℃下的E'（單位：×10⁸ Pa）、以及-30℃、-20℃、-10℃、0℃、10℃、20℃、及30℃下的tanδ的值歸納於表1～表3。(1) Dynamic Viscoelasticity Measurement of Resin Composition (Z) constituting the Extended Porous Film In the examples and comparative examples shown below, an unstretched film using the resin composition (Z) constituting the elongated porous film was used. A long sample piece cut into MD: 4 mm and TD: 35 mm was subjected to dynamic viscoelasticity measurement according to the method, and the storage elastic modulus (E'), the loss elastic modulus (E''), and The ratio of the storage elastic coefficient (E') to the loss elastic coefficient (E'') is tan δ (=E''/E'). Then, when tan δ is 0.100 or more at -20 ° C, it is judged as "A", and when tan δ is less than 0.100 at -20 ° C, it is judged as "B".
Further, the values of tan δ at 20° C., E′ (unit:×10 ⁸ Pa), and -30° C., -20° C., −10° C., 0° C., 10° C., 20° C., and 30° C. are summarized. Table 1 to Table 3.

（2）延伸多孔膜的基重
按照所述方法來算出延伸多孔膜的基重。(2) Basis Weight of the Extending Porous Film The basis weight of the elongated porous film was calculated in accordance with the method described above.

（3）延伸多孔膜的空孔率
按照所述方法來算出延伸多孔膜的空孔率。(3) Porosity of the elongated porous film The porosity of the expanded porous film was calculated in accordance with the above method.

（4）延伸多孔膜的透氣度
按照所述方法來算出延伸多孔膜的透氣度。作為透氣度測定裝置，使用旭精工（股）公司製造的王研式透氣度測定機EGO1-55型。(4) Air Permeability of Extended Porous Film The air permeability of the elongated porous film was calculated in accordance with the method described above. As the air permeability measuring device, a Wang-type air permeability measuring machine EGO1-55 manufactured by Asahi Seiko Co., Ltd. was used.

（5）延伸多孔膜的透濕度
按照所述方法來算出延伸多孔膜的透濕度。(5) Transmittance of the extended porous film The moisture permeability of the extended porous film was calculated in accordance with the above method.

（6）延伸多孔膜的延伸方向的拉伸斷裂強度
按照所述方法來算出延伸多孔膜的延伸方向（本實施例、比較例中為MD）的拉伸斷裂強度。(6) Tensile breaking strength in the extending direction of the expanded porous film The tensile breaking strength in the extending direction of the expanded porous film (MD in the present example and the comparative example) was calculated by the above method.

（7）延伸多孔膜的延伸方向的拉伸斷裂伸長率
按照所述方法來算出延伸多孔膜的延伸方向（本實施例、比較例中為MD）的拉伸斷裂伸長率。(7) Tensile elongation at break in the extending direction of the expanded porous film The tensile elongation at break in the extending direction of the expanded porous film (MD in the present example and the comparative example) was calculated by the above method.

（8）延伸多孔膜的熱收縮率
於實施例101～實施例104及比較例101～比較例102中，按照所述方法來算出於60℃下加熱1小時時的延伸多孔膜的於延伸方向（本實施例、比較例中為MD）上的熱收縮率。(8) Thermal Shrinkage Ratio of Extended Porous Film In Examples 101 to 104 and Comparative Examples 101 to 102, the extending direction of the expanded porous film when heated at 60 ° C for 1 hour was calculated according to the above method. (The heat shrinkage ratio in the present embodiment and the comparative example is MD).

（9）延伸多孔膜的總光線透過率
按照所述方法來算出延伸多孔膜的總光線透過率。(9) Total Light Transmittance of the Extending Porous Film The total light transmittance of the elongated porous film was calculated in accordance with the method described above.

（10）延伸多孔膜的結晶熔融峰值（Pm）、結晶熔融焓（ΔHm）
利用示差掃描型熱量計（DSC）將以下示出的實施例、比較例中所獲得的延伸多孔膜以加熱速度10℃/分鐘自-40℃升溫至200℃後，保持1分鐘，繼而以冷卻速度10℃/分鐘自200℃降溫至-40℃後，保持1分鐘，進而以加熱速度10℃/分鐘自-40℃再升溫至200℃，藉此，根據再升溫過程中的結晶熔融峰值（Pm）、及再升溫過程中的所述結晶熔融峰值（Pm）的峰值面積來算出延伸多孔膜的結晶熔融焓（ΔHm）。
於實施例201～實施例205及比較例201～比較例204中，此時，於140℃～200℃下確認了結晶熔融峰值（Pm1）的有無。另外，根據所述（Pm1）而算出峰值溫度（Tm1）、結晶熔融焓（ΔHm1）。同樣地，於30℃～130℃下確認了結晶熔融峰值（Pm2）的有無。另外，根據所述（Pm2）而算出峰值溫度（Tm2）、結晶熔融焓（ΔHm2）。(10) Crystal melting peak (Pm) and crystal melting enthalpy (ΔHm) of the elongated porous film
The elongated porous film obtained in the examples and the comparative examples shown below was heated from -40 ° C to 200 ° C at a heating rate of 10 ° C/min by a differential scanning calorimeter (DSC), and then held for 1 minute, followed by cooling. After the temperature is lowered from 200 ° C to -40 ° C at a rate of 10 ° C / min, the temperature is maintained for 1 minute, and further heated from -40 ° C to 200 ° C at a heating rate of 10 ° C / min, thereby, according to the peak of crystal melting during the reheating process ( The crystal melting enthalpy (ΔHm) of the extended porous film was calculated by Pm) and the peak area of the crystal melting peak (Pm) during the reheating.
In the examples 201 to 205 and the comparative examples 201 to 204, the presence or absence of the crystal melting peak (Pm1) was confirmed at 140 ° C to 200 ° C. Further, the peak temperature (Tm1) and the crystal melting enthalpy (ΔHm1) were calculated from the above (Pm1). In the same manner, the presence or absence of the crystal melting peak (Pm2) was confirmed at 30 ° C to 130 ° C. Further, the peak temperature (Tm2) and the crystal melting enthalpy (ΔHm2) were calculated from the above (Pm2).

（11）延伸多孔膜的柔軟性
將以下示出的實施例、比較例中所獲得的延伸多孔膜剪裁為縱向（MD）1000 mm、橫向（TD）200 mm，並用手觸摸，按照下述判斷基準進行評價。
A：膜中感覺到柔軟的手感。
B：膜中感覺到硬度。(11) Flexibility of the extended porous film The elongated porous film obtained in the examples and comparative examples shown below was cut into a machine direction (MD) of 1000 mm and a transverse direction (TD) of 200 mm, and was touched by hand, and judged as follows. Benchmarks are evaluated.
A: A soft hand is felt in the film.
B: Hardness was felt in the film.

（12）延伸多孔膜的不舒適聲音
對於延伸多孔膜的不舒適聲音，藉由以下試驗或不舒適聲音測定進行了評價。(12) Uncomfortable sound of the extended porous film The uncomfortable sound of the extended porous film was evaluated by the following test or uncomfortable sound measurement.

（12-1）延伸多孔膜的摩擦所引起的不舒適聲音
將以下示出的實施例、比較例中所獲得的延伸多孔膜剪裁為縱向（MD）1000 mm、橫向（TD）200 mm，並使膜相互摩擦，按照下述判斷基準進行評價。
A：即便相互摩擦亦感覺不到不舒適的聲音。
B：若相互摩擦，則感覺到沙沙的不舒適的聲音。(12-1) Uncomfortable sound caused by friction of the extended porous film The extended porous film obtained in the examples and comparative examples shown below was cut into a machine direction (MD) of 1000 mm and a lateral direction (TD) of 200 mm, and The films were rubbed against each other and evaluated according to the following criteria.
A: I don't feel uncomfortable sound even if I rub each other.
B: If you rub each other, you will feel the uncomfortable sound of rustling.

（12-2）延伸多孔膜的不舒適聲音測定
關於延伸多孔膜的不舒適聲音測定，測定場所是於寬3 m左右、長4 m左右、高3 m左右的單間內（於外部雜訊的影響少的環境下），使用理音（Rion）股份有限公司製造的普通雜訊計NL-42，將頻率加權特性設為A特性，將時間加權特性設為F特性來進行。
首先，將以下示出的實施例、比較例中所獲得的延伸多孔膜剪裁為縱向（MD）400 mm、橫向（TD）200 mm，並於縱向中央處折疊一次，使其以對折的方式重合。然後，夾持經重合的延伸多孔膜的TD兩端部，以所夾持的TD兩端部間距離成為100 mm的方式進行調整。
進而，將所夾持的延伸多孔膜與普通雜訊計的麥克風（集聲部）的距離調整為100 mm後，於所夾持的延伸多孔膜的與MD、及TD垂直的方向（厚度方向）上使所夾持的端部於1秒內往復振動3次，藉此使膜相互摩擦，對測定時間10秒內的時間平均聲級（LAeq）進行測定，按照下述判斷基準進行評價。
再者，不使膜振動的狀態（無動作狀態）下的測定時間10秒的時間平均聲級（sound level）（LAeq）為26 dB。
A：時間平均聲級（LAeq）為26 dB以上且未滿35 dB
B：時間平均聲級（LAeq）為35 dB以上且未滿45 dB
C：時間平均聲級（LAeq）為45 dB以上(12-2) Uncomfortable sound measurement of the extended porous film The measurement of the uncomfortable sound of the extended porous film was performed in a single room having a width of about 3 m, a length of about 4 m, and a height of about 3 m (in the case of external noise). In the case of a small amount of influence, the general-purpose noise meter NL-42 manufactured by Rion Co., Ltd. is used to set the frequency weighting characteristic to the A characteristic and the time weighting characteristic to the F characteristic.
First, the extended porous film obtained in the examples and comparative examples shown below was cut into a machine direction (MD) of 400 mm and a transverse direction (TD) of 200 mm, and folded once at the center in the longitudinal direction to be folded in a folded manner. . Then, both ends of the TD of the superposed extended porous film were sandwiched so as to be adjusted so that the distance between the both ends of the TD to be sandwiched was 100 mm.
Further, after the distance between the held extended porous film and the microphone (accumulation portion) of the ordinary noise meter is adjusted to 100 mm, the direction of the thickness of the extended porous film to be sandwiched is MD and TD (thickness direction) The end portions held by the reciprocating vibration were rubbed three times in one second to rub the films, and the time average sound level (LAeq) within 10 seconds of the measurement time was measured, and evaluated according to the following criteria.
Further, the time average sound level (LAeq) of the measurement time of 10 seconds in the state in which the film was not vibrated (non-operating state) was 26 dB.
A: Time average sound level (LAeq) is more than 26 dB and less than 35 dB
B: Time average sound level (LAeq) is more than 35 dB and less than 45 dB
C: Time average sound level (LAeq) is 45 dB or more

（13）延伸多孔膜的破膜耐熱溫度
於實施例201～實施例205及比較例201～比較例204中，進而按照所述方法來評價破膜耐熱溫度。關於評價，將對流烘箱的槽內溫度設為120℃、140℃、160℃，對於在槽內靜置2分鐘並加熱後的狀態，以目視評價的方式，按照下述判斷基準進行評價。
A：不鏽鋼板的圓狀沖裁部位的樣品中無破裂或穿孔。
B：不鏽鋼板的圓狀沖裁部位的樣品發生熔融並穿孔。(13) The heat-resistant temperature of the rupture film of the expanded porous film was measured in Examples 201 to 205 and Comparative Examples 201 to 204, and the heat-resistant temperature of the film was further evaluated according to the above method. In the evaluation, the in-tank temperature of the convection oven was set to 120° C., 140° C., and 160° C., and the state after standing in the tank for 2 minutes and heated was visually evaluated and evaluated according to the following criteria.
A: There is no crack or perforation in the sample of the round punched portion of the stainless steel plate.
B: The sample of the round punched portion of the stainless steel plate was melted and perforated.

（14）綜合評價
（14-1）實施例101～實施例104及比較例101～比較例102
鑒於所述（1）～（12）所示的評價，按照下述基準進行綜合評價。
A：為具有柔軟性與手感之類的優異觸感，並且抑制了於膜的摩擦時所產生的不舒適的聲音的發生的、適於要求通氣性或透濕性的用途的膜。
B：為具有柔軟性與手感之類的優異觸感、且通氣性與透濕性優異的膜，但為感覺到不舒適的聲音的發生的膜。
C：為通氣性與透濕性優異的膜，但為未感覺到柔軟性或手感之類的觸感、且感覺到不舒適的聲音的發生的膜。
D：為通氣性與透濕性等延伸多孔膜所要求的物性並不充分的膜。
（14-2）實施例105～實施例108及比較例103～比較例104
鑒於所述（1）～（7）及（9）～（12）所示的評價，按照下述基準進行綜合評價。
A：為具有柔軟性與手感之類的優異觸感，並且抑制了於膜的摩擦時所產生的不舒適的聲音的發生的、適於要求通氣性或透濕性的用途的膜。
B：為具有柔軟性與手感之類的優異觸感、且通氣性與透濕性優異的膜，但為感覺到不舒適的聲音的發生的膜。
C：為通氣性與透濕性優異的膜，但為未感覺到柔軟性或手感之類的觸感、且感覺到不舒適的聲音的發生的膜。
D：為通氣性與透濕性等延伸多孔膜所要求的物性並不充分的膜。
（14-3）實施例201～實施例205及比較例201～比較例204
鑒於所述（1）～（7）及（9）～（13）所示的評價，按照下述基準進行綜合評價。
A：為具有柔軟性與手感之類的優異觸感，並且抑制了於膜的摩擦時所產生的不舒適的聲音的發生的、適於要求通氣性或透濕性的用途的膜，且為兼具充分的耐熱性的膜。
B：為具有柔軟性與手感之類的優異觸感，並且抑制了於膜的摩擦時所產生的不舒適的聲音的發生的、適於要求通氣性或透濕性的用途的膜，但耐熱性並不充分。
C：為通氣性與透濕性優異的膜，但為未感覺到柔軟性或手感之類的觸感、且感覺到不舒適的聲音的發生的膜。
D：為通氣性與透濕性等延伸多孔膜所要求的物性並不充分的膜。(14) Comprehensive Evaluation (14-1) Example 101 to Example 104 and Comparative Example 101 to Comparative Example 102
In view of the evaluations shown in the above (1) to (12), the comprehensive evaluation was carried out in accordance with the following criteria.
A: A film which is excellent in softness and texture, and which suppresses the occurrence of uncomfortable sound generated when the film is rubbed, and is suitable for applications requiring air permeability or moisture permeability.
B: A film which is excellent in air permeability and moisture permeability, and which is excellent in air permeability and moisture permeability, but is a film which is expected to cause uncomfortable sound.
C: a film which is excellent in air permeability and moisture permeability, but is a film which does not feel a touch such as softness or hand feeling, and which causes an uncomfortable sound.
D: A film which is insufficient in physical properties required for extending the porous film such as air permeability and moisture permeability.
(14-2) Example 105 to Example 108 and Comparative Example 103 to Comparative Example 104
In view of the evaluations shown in the above (1) to (7) and (9) to (12), the overall evaluation was carried out in accordance with the following criteria.
A: A film which is excellent in softness and texture, and which suppresses the occurrence of uncomfortable sound generated when the film is rubbed, and is suitable for applications requiring air permeability or moisture permeability.
B: A film which is excellent in air permeability and moisture permeability, and which is excellent in air permeability and moisture permeability, but is a film which is expected to cause uncomfortable sound.
C: a film which is excellent in air permeability and moisture permeability, but is a film which does not feel a touch such as softness or hand feeling, and which causes an uncomfortable sound.
D: A film which is insufficient in physical properties required for extending the porous film such as air permeability and moisture permeability.
(14-3) Examples 201 to 205 and Comparative Examples 201 to 204
In view of the evaluations shown in the above (1) to (7) and (9) to (13), the overall evaluation was carried out in accordance with the following criteria.
A: a film which is excellent in softness and texture, and which suppresses the occurrence of uncomfortable sound generated when the film is rubbed, is suitable for applications requiring air permeability or moisture permeability, and is A film that has sufficient heat resistance.
B: a film suitable for applications requiring air permeability or moisture permeability, which is excellent in softness and texture, and which suppresses the occurrence of uncomfortable sound generated when the film is rubbed, but is resistant to heat. Sex is not sufficient.
C: a film which is excellent in air permeability and moisture permeability, but is a film which does not feel a touch such as softness or hand feeling, and which causes an uncomfortable sound.
D: A film which is insufficient in physical properties required for extending the porous film such as air permeability and moisture permeability.

各實施例、比較例中所使用的原材料如下所述。
＜無機填充材（A）＞
·備北粉化工業（股）公司製造的重質碳酸鈣「萊頓（Lighton）BS-0」（平均粒徑1.1 μm、硬脂酸表面處理品）。以下，省略為「A-1」。
＜聚乙烯系樹脂（B）＞
·日本聚乙烯（股）公司製造的直鏈狀低密度聚乙烯「諾瓦蒂（NOVATEC）LL UF230」（密度0.921 g/cm³ 、MFR 1.0 g/10分鐘、熔點120℃）。以下，省略為「B-1」。
·日本聚乙烯（股）公司製造的分支狀低密度聚乙烯「諾瓦蒂（NOVATEC）LD LF441」（密度0.918 g/cm³ 、MFR 2.3 g/10分鐘、熔點113℃）。以下，省略為「B-2」。
＜軟質聚烯烴系樹脂（C）＞
·日本聚乙烯（股）公司製造的茂金屬系乙烯/α-烯烴共聚物「科奈爾（Kernel）KF360T」（密度0.898 g/cm³ 、MFR 3.5 g/10分鐘、熔點90℃）。以下，省略為「C-1」。
·陶氏化學（Dow Chemical）公司製造的乙烯/辛烯嵌段共聚物「因弗斯（Infuse）D9100.05」（密度0.877 g/cm³ 、MFR 1.0 g/10分鐘、熔點120℃）。以下，省略為「C-2」。
·三井化學（股）公司製造的乙烯/1-丁烯共聚物「塔夫瑪（TAFMER）A1050S」（密度0.862 g/cm³ 、MFR 1.2 g/10分鐘、熔點45℃）。以下，省略為「C-3」。
·陶氏化學（Dow Chemical）公司製造的乙烯/辛烯嵌段共聚物「因弗斯（Infuse）D9107」（密度0.866 g/cm³ 、MFR 1 g/10分鐘、熔點119℃）。以下，省略為「C-4」。
＜聚丙烯系樹脂（D）＞
·日本波利普羅（Polypro）（股）公司製造的聚丙烯「諾瓦蒂（NOVATEC）PP SA03」（密度0.900 g/cm³ 、MFR 30 g/10分鐘、熔點165℃）。以下，省略為「D-1」。
＜塑化劑（E）＞
·KF貿易（KF TRADING）（股）公司製造的硬化蓖麻油「HCO-P3」。以下，省略為「E-1」。
·J普拉斯（J-PLUS）（股）公司製造的液體聚酯系塑化劑「迪亞賽嘉（Diasizer） D600」。以下，省略為「E-2」。
＜抗氧化劑＞
·巴斯夫日本（BASF Japan）（股）公司製造的抗氧化劑「易璐諾斯（Irganox）B225」。以下，省略為「F-1」。
＜其他樹脂＞
·三井化學（股）公司製造的α-烯烴共聚物「艾博索特瑪（absortomer）EP-1001」（密度0.84 g/cm³ 、MFR 10g/10分鐘（230℃2.16 kg負荷））。以下，省略為「G-1」。The raw materials used in the respective examples and comparative examples are as follows.
<Inorganic filler (A)>
· Heavy calcium carbonate "Lighton BS-0" manufactured by Kitabe Chemical Industry Co., Ltd. (average particle size 1.1 μm, stearic acid surface treatment). Hereinafter, it is abbreviated as "A-1".
<polyethylene resin (B)>
- Linear low-density polyethylene "NOVATEC LL UF230" manufactured by Japan Polyethylene Co., Ltd. (density 0.921 g/cm ³ , MFR 1.0 g/10 min, melting point 120 ° C). Hereinafter, it is abbreviated as "B-1".
- Branched low-density polyethylene "NOVATEC LD LF441" manufactured by Japan Polyethylene Co., Ltd. (density 0.918 g/cm ³ , MFR 2.3 g/10 min, melting point 113 ° C). Hereinafter, it is abbreviated as "B-2".
<Soft polyolefin resin (C)>
- Metallocene ethylene/α-olefin copolymer "Kernel KF360T" manufactured by Japan Polyethylene Co., Ltd. (density: 0.898 g/cm ³ , MFR 3.5 g/10 min, melting point: 90 ° C). Hereinafter, it is abbreviated as "C-1".
An ethylene/octene block copolymer "Infuse D9100.05" manufactured by Dow Chemical Co., Ltd. (density 0.877 g/cm ³ , MFR 1.0 g/10 min, melting point 120 ° C). Hereinafter, it is abbreviated as "C-2".
- The ethylene/1-butene copolymer "TAFMER A1050S" manufactured by Mitsui Chemicals Co., Ltd. (density 0.862 g/cm ³ , MFR 1.2 g/10 min, melting point 45 ° C). Hereinafter, it is abbreviated as "C-3".
An ethylene/octene block copolymer "Infuse D9107" manufactured by Dow Chemical Co., Ltd. (density 0.866 g/cm ³ , MFR 1 g/10 min, melting point 119 ° C). Hereinafter, it is abbreviated to "C-4".
<Polypropylene resin (D)>
- Polypropylene "PAVA03" manufactured by Polypro Co., Ltd., Japan (density 0.900 g/cm ³ , MFR 30 g/10 min, melting point 165 ° C). Hereinafter, it is abbreviated to "D-1".
<Plasticizer (E)>
· Hardened castor oil "HCO-P3" manufactured by KF Trading (KF TRADING) Co., Ltd. Hereinafter, it is omitted as "E-1".
· The liquid polyester plasticizer "Diasizer D600" manufactured by J-PLUS (J-PLUS) Co., Ltd. Hereinafter, it is omitted as "E-2".
<antioxidant>
· The antioxidant "Irganox B225" manufactured by BASF Japan. Hereinafter, it is omitted as "F-1".
<Other resins>
The α-olefin copolymer "absortomer EP-1001" manufactured by Mitsui Chemicals Co., Ltd. (density 0.84 g/cm ³ , MFR 10 g/10 min (230 ° C 2.16 kg load)). Hereinafter, it is omitted as "G-1".

＜實施例101＞
以表1所示的組成比率秤量各原材料之後，投入至亨歇爾混合機（Henschel mixer）中，使其混合、分散5分鐘，使用同向雙軸擠出機於設定溫度200℃下熔融混煉後，藉由連接至同向雙軸擠出機前端的T型模頭將樹脂組成物擠出，並藉由設定為50℃的鑄造輥（casting roll）進行抽取，使其冷卻固化，從而獲得未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。
然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比130%（延伸倍率2.3倍）、（T）-（U）拉伸比130%（延伸倍率2.3倍），於MD上進行合計5.3倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Example 101>
The raw materials were weighed in the composition ratio shown in Table 1, and then placed in a Henschel mixer, mixed and dispersed for 5 minutes, and melt-blended at a set temperature of 200 ° C using a co-rotating twin-screw extruder. After the refining, the resin composition was extruded by a T-die attached to the front end of the co-rotating twin-screw extruder, and extracted by a casting roll set at 50 ° C to be cooled and solidified. An unstretched film was obtained. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed.
Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 130% (the stretch ratio was 2.3 times), the (T)-(U) stretch ratio was 130% (the stretch ratio was 2.3 times), and the total was 5.3 times extended on the MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

＜實施例102＞
藉由與實施例101同樣的方法採取未延伸膜。然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比100%（延伸倍率2.0倍）、（T）-（U）拉伸比100%（延伸倍率2.0倍），於MD上進行合計4.0倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Example 102>
An unstretched film was taken by the same method as in Example 101. Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 100% (extension ratio 2.0 times), (T)-(U) stretch ratio was 100% (extension ratio 2.0 times), and the total extension was 4.0 times in MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

＜實施例103＞
藉由與實施例101同樣的方法採取未延伸膜。然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比70%（延伸倍率1.7倍）、（T）-（U）拉伸比70%（延伸倍率1.7倍），於MD上進行合計2.9倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Example 103>
An unstretched film was taken by the same method as in Example 101. Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 70% (the stretch ratio was 1.7 times), the (T)-(U) stretch ratio was 70% (the stretch ratio was 1.7 times), and the total stretch was 2.9 times in MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

＜比較例101＞
藉由與實施例101同樣的方法採取未延伸膜。然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比40%（延伸倍率1.4倍）、（T）-（U）拉伸比40%（延伸倍率1.4倍），於MD上進行合計2.0倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Comparative Example 101>
An unstretched film was taken by the same method as in Example 101. Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 40% (the stretch ratio was 1.4 times), the (T)-(U) stretch ratio was 40% (the stretch ratio was 1.4 times), and the total extension was 2.0 times on the MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

＜實施例104＞
以表1所示的組成比率秤量各原材料之後，投入至亨歇爾混合機中，使其混合、分散5分鐘，使用同向雙軸擠出機於設定溫度200℃下熔融混煉後，藉由連接至同向雙軸擠出機前端的T型模頭將樹脂組成物擠出，並藉由設定為50℃的鑄造輥進行抽取，使其冷卻固化，從而獲得未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。
然後，將所獲得的未延伸膜於設定為20℃的輥（S）與設定為20℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比100%（延伸倍率2.0倍）、（T）-（U）拉伸比100%（延伸倍率2.0倍），於MD上進行合計4.0倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Example 104>
The raw materials were weighed in the composition ratio shown in Table 1, and then placed in a Henschel mixer, mixed and dispersed for 5 minutes, and melted and kneaded at a set temperature of 200 ° C using a co-rotating twin-screw extruder. The resin composition was extruded from a T-die attached to the front end of the co-rotating twin-screw extruder, and drawn by a casting roll set at 50 ° C to be cooled and solidified, thereby obtaining an unstretched film. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed.
Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 20 ° C and a roll (T) set to 20 ° C and a roll (U) set to 60 ° C. The draw ratio was 100% (extension ratio 2.0 times), (T)-(U) stretch ratio was 100% (extension ratio 2.0 times), and the total extension was 4.0 times in MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

＜比較例102＞
以表1所示的組成比率秤量各原材料之後，投入至亨歇爾混合機中，使其混合、分散5分鐘，使用同向雙軸擠出機於設定溫度200℃下熔融混煉後，藉由連接至同向雙軸擠出機前端的T型模頭將樹脂組成物擠出，並藉由設定為50℃的鑄造輥進行抽取，使其冷卻固化，從而獲得未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。
然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比130%（延伸倍率2.3倍）、（T）-（U）拉伸比130%（延伸倍率2.3倍），於MD上進行合計5.3倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表1。<Comparative Example 102>
The raw materials were weighed in the composition ratio shown in Table 1, and then placed in a Henschel mixer, mixed and dispersed for 5 minutes, and melted and kneaded at a set temperature of 200 ° C using a co-rotating twin-screw extruder. The resin composition was extruded from a T-die attached to the front end of the co-rotating twin-screw extruder, and drawn by a casting roll set at 50 ° C to be cooled and solidified, thereby obtaining an unstretched film. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed.
Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 130% (the stretch ratio was 2.3 times), the (T)-(U) stretch ratio was 130% (the stretch ratio was 2.3 times), and the total was 5.3 times extended on the MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 1.

[表1]


[Table 1]

實施例101～實施例104中所獲得的延伸多孔膜為透氣特性或透濕特性優異、並且具有適宜的拉伸斷裂強度、拉伸斷裂伸長率、熱收縮率、總光線透過率的膜。另外，即便使實施例101～實施例104中所獲得的延伸多孔膜相互摩擦，亦未感覺到不舒適的聲音。
其結果，認為原因在於，構成本發明的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ、及延伸多孔膜的空孔率滿足本發明中規定的範圍。具體而言，認為原因在於，構成實施例101～實施例104的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ於-20℃下成為0.100以上，因此，使樹脂組成物（Z）振動並傳播的聲音衰減，有助於抑制不舒適聲音。另外，實施例101～實施例104的延伸多孔膜的空孔率處於25%～80%的範圍內，因此，於連通的空隙中傳播的聲音於與空隙和樹脂組成物（Z）的壁面撞擊時所產生的能量損失的次數增多，有助於抑制不舒適聲音。
另一方面，比較例101中所獲得的膜與實施例101～實施例103同樣地，使用滿足本發明所規定的所述tanδ的規定的樹脂組成物（Z），但比較例101中所獲得的延伸多孔膜脫離了本發明所規定的空孔率。因此，比較例101中所獲得的膜雖然柔軟性或手感之類的觸感優異，但對不舒適聲音的抑制不充分。
另外，比較例102中所獲得的膜滿足本發明所規定的空孔率，但-20℃下的tanδ未滿0.100，對不舒適聲音的抑制不充分。
即，可知，為了兼顧優異的觸感、與對膜摩擦時所產生的不舒適聲音的抑制，重要的是所述tanδ及空孔率兩者滿足本發明所規定的範圍。The elongated porous film obtained in each of Examples 101 to 104 was excellent in gas permeability or moisture permeability, and had a film having suitable tensile breaking strength, tensile elongation at break, heat shrinkage, and total light transmittance. Further, even if the stretched porous films obtained in Examples 101 to 104 were rubbed against each other, an uncomfortable sound was not felt.
As a result, it is considered that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of the present invention and the porosity of the expanded porous film satisfy the range defined in the present invention. Specifically, it is considered that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of Examples 101 to 104 is 0.100 or more at -20 ° C, so that the resin is made. The sound of the composition (Z) vibrating and propagating is attenuated, helping to suppress uncomfortable sound. Further, the porosity of the expanded porous film of Examples 101 to 104 is in the range of 25% to 80%, and therefore, the sound propagating in the communicating voids collides with the void and the wall surface of the resin composition (Z). The number of energy losses that occur during the increase increases, helping to suppress uncomfortable sound.
On the other hand, in the film obtained in Comparative Example 101, a predetermined resin composition (Z) satisfying the tan δ prescribed in the present invention was used in the same manner as in Examples 101 to 103, but the obtained in Comparative Example 101 was obtained. The extended porous membrane deviates from the porosity specified in the present invention. Therefore, the film obtained in Comparative Example 101 is excellent in tactile sensation such as softness and hand feeling, but is insufficient in suppressing uncomfortable sound.
Further, the film obtained in Comparative Example 102 satisfies the porosity specified in the present invention, but the tan δ at -20 ° C is less than 0.100, and the suppression of uncomfortable sound is insufficient.
In other words, it is important that both the tan δ and the porosity satisfy the range defined by the present invention in order to achieve both excellent tactile sensation and suppression of uncomfortable sound generated when the film is rubbed.

＜實施例105＞
以表2所示的組成比率秤量各原材料之後，投入至亨歇爾混合機中，使其混合、分散5分鐘，使用同向雙軸擠出機於設定溫度200℃下熔融混煉後，藉由連接至同向雙軸擠出機前端的T型模頭將樹脂組成物擠出，並藉由設定為50℃的鑄造輥進行抽取，使其冷卻固化，從而獲得厚度30 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。
然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比100%（延伸倍率2.0倍）、（T）-（U）拉伸比100%（延伸倍率2.0倍），於MD上進行合計4.0倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Example 105>
The raw materials were weighed in the composition ratio shown in Table 2, and then placed in a Henschel mixer, mixed and dispersed for 5 minutes, and melted and kneaded at a set temperature of 200 ° C using a co-rotating twin-screw extruder. The resin composition was extruded from a T-die attached to the front end of the co-rotating twin-screw extruder, and drawn by a casting roll set at 50 ° C to be solidified by cooling to obtain an unstretched film having a thickness of 30 μm. . Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed.
Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 100% (extension ratio 2.0 times), (T)-(U) stretch ratio was 100% (extension ratio 2.0 times), and the total extension was 4.0 times in MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

＜實施例106＞
除了將原材料變更為表2所示的組成比率以外，藉由與實施例105同樣的方法採取厚度30 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例105同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Example 106>
An unstretched film having a thickness of 30 μm was taken in the same manner as in Example 105 except that the raw material was changed to the composition ratio shown in Table 2. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 105, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

＜實施例107＞
除了將原材料變更為表2所示的組成比率以外，藉由與實施例105同樣的方法採取厚度30 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例105同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Example 107>
An unstretched film having a thickness of 30 μm was taken in the same manner as in Example 105 except that the raw material was changed to the composition ratio shown in Table 2. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 105, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

＜實施例108＞
除了將原材料變更為表2所示的組成比率以外，藉由與實施例105同樣的方法採取厚度50 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例105同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Example 108>
An unstretched film having a thickness of 50 μm was taken in the same manner as in Example 105 except that the raw material was changed to the composition ratio shown in Table 2. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 105, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

＜比較例103＞
除了將原材料變更為表2所示的組成比率以外，藉由與實施例105同樣的方法採取厚度50 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例105同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Comparative Example 103>
An unstretched film having a thickness of 50 μm was taken in the same manner as in Example 105 except that the raw material was changed to the composition ratio shown in Table 2. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 105, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

＜比較例104＞
除了將原材料變更為表2所示的組成比率以外，藉由與實施例105同樣的方法採取厚度50 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例105同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表2。<Comparative Example 104>
An unstretched film having a thickness of 50 μm was taken in the same manner as in Example 105 except that the raw material was changed to the composition ratio shown in Table 2. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 105, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 2.

[表2]


[Table 2]

實施例105～實施例108中所獲得的延伸多孔膜為透氣特性或透濕特性優異、並且具有適宜的拉伸斷裂強度、拉伸斷裂伸長率、總光線透過率的膜。另外，使實施例105～實施例108中所獲得的延伸多孔膜相互摩擦時的時間平均聲級（LAeq）顯示為低值，未感覺到不舒適的聲音。
其結果，認為原因在於，構成本發明的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ、及延伸多孔膜的空孔率滿足本發明中規定的範圍，且延伸多孔膜的結晶熔融焓（ΔHm）成為10 J/g～45 J/g。具體而言，認為原因在於，構成實施例105～實施例108的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ於-20℃下成為0.100以上，因此，使樹脂組成物（Z）振動並傳播的聲音衰減，有助於抑制不舒適聲音。另外認為，原因在於，實施例105～實施例108的延伸多孔膜的結晶熔融焓（ΔHm）處於10 J/g～45 J/g的範圍內，故賦予外力時排斥並振動的結晶成分少，因此產生的聲音變小。
另一方面，比較例103、比較例104中所獲得的膜未滿足本發明所規定的tanδ或結晶熔融焓（ΔHm）的較佳範圍，因此對不舒適聲音的抑制不充分，時間平均聲級（LAeq）顯示為高值。
即，可知，為了兼顧優異的觸感、與對膜摩擦時所產生的不舒適聲音的抑制，重要的是所述tanδ、及延伸多孔膜的空孔率滿足本發明所規定的範圍，較佳為延伸多孔膜的結晶熔融焓（ΔHm）處於10 J/g～45 J/g的範圍內。The elongated porous film obtained in each of Examples 105 to 108 was excellent in gas permeability characteristics or moisture permeability characteristics, and had a film having suitable tensile breaking strength, tensile breaking elongation, and total light transmittance. Further, the time-averaged sound level (LAeq) when the stretched porous films obtained in Examples 105 to 108 were rubbed against each other was shown to be a low value, and an uncomfortable sound was not felt.
As a result, it is considered that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of the present invention and the porosity of the expanded porous film satisfy the range defined in the present invention, and are extended. The crystal melting enthalpy (ΔHm) of the porous film is 10 J/g to 45 J/g. Specifically, the reason is that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of Examples 105 to 108 is 0.100 or more at -20 ° C, so that the resin is made. The sound of the composition (Z) vibrating and propagating is attenuated, helping to suppress uncomfortable sound. In addition, it is considered that the crystal melting enthalpy (ΔHm) of the expanded porous film of Examples 105 to 108 is in the range of 10 J/g to 45 J/g, so that the crystal component which is repelled and vibrated when an external force is applied is small. The resulting sound becomes smaller.
On the other hand, the films obtained in Comparative Example 103 and Comparative Example 104 did not satisfy the preferable range of tan δ or crystal melting enthalpy (ΔHm) prescribed by the present invention, and thus the suppression of uncomfortable sound was insufficient, and the time average sound level was insufficient. (LAeq) is shown as a high value.
In other words, it is important that the tan δ and the porosity of the elongated porous film satisfy the range defined by the present invention in order to achieve both an excellent touch and suppression of an uncomfortable sound generated when the film is rubbed. The crystal melting enthalpy (ΔHm) for extending the porous film is in the range of 10 J/g to 45 J/g.

＜實施例201＞
以表3所示的組成比率秤量各原材料之後，投入至亨歇爾混合機中，使其混合、分散5分鐘，使用同向雙軸擠出機於設定溫度200℃下熔融混煉後，藉由連接至同向雙軸擠出機前端的T型模頭將樹脂組成物擠出，並藉由設定為50℃的鑄造輥進行抽取，使其冷卻固化，從而獲得厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。
然後，將所獲得的未延伸膜於設定為60℃的輥（S）與設定為60℃的輥（T）、及設定為60℃的輥（U）之間乘以（S）-（T）拉伸比100%（延伸倍率2.0倍）、（T）-（U）拉伸比100%（延伸倍率2.0倍），於MD上進行合計4.0倍延伸。繼而，藉由設定為90℃的輥（V）進行熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Example 201>
The raw materials were weighed in the composition ratio shown in Table 3, and then placed in a Henschel mixer, mixed and dispersed for 5 minutes, and melted and kneaded at a set temperature of 200 ° C using a co-rotating twin-screw extruder. The resin composition was extruded from a T-die attached to the front end of the co-rotating twin-screw extruder, and drawn by a casting roll set at 50 ° C to be cooled and solidified, thereby obtaining an unstretched film having a thickness of 35 μm. . Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed.
Then, the obtained unstretched film was multiplied by (S)-(T) between a roll (S) set to 60 ° C and a roll (T) set to 60 ° C and a roll (U) set to 60 ° C. The draw ratio was 100% (extension ratio 2.0 times), (T)-(U) stretch ratio was 100% (extension ratio 2.0 times), and the total extension was 4.0 times in MD. Then, heat treatment and relaxation treatment were carried out by a roll (V) set to 90 ° C, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜實施例202＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Example 202>
An unstretched film having a thickness of 35 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜實施例203＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Example 203>
An unstretched film having a thickness of 35 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜實施例204＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Example 204>
An unstretched film having a thickness of 35 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜實施例205＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Example 205>
An unstretched film having a thickness of 35 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜比較例201＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度50 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Comparative Example 201>
An unstretched film having a thickness of 50 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜比較例202＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度50 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Comparative Example 202>
An unstretched film having a thickness of 50 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜比較例203＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度30 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Comparative Example 203>
An unstretched film having a thickness of 30 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

＜比較例204＞
除了將原材料變更為表3所示的組成比率以外，藉由與實施例201同樣的方法採取厚度35 μm的未延伸膜。關於所獲得的未延伸膜，進行動態黏彈性測定。然後，藉由與實施例201同樣的方法對所獲得的未延伸膜進行延伸、熱處理及鬆弛處理，藉此獲得延伸多孔膜。關於所獲得的延伸多孔膜，進行各種評價。將結果歸納於表3。<Comparative Example 204>
An unstretched film having a thickness of 35 μm was taken in the same manner as in Example 201 except that the raw material was changed to the composition ratio shown in Table 3. Regarding the obtained unstretched film, dynamic viscoelasticity measurement was performed. Then, the obtained unstretched film was subjected to stretching, heat treatment, and relaxation treatment in the same manner as in Example 201, whereby an elongated porous film was obtained. Regarding the obtained expanded porous film, various evaluations were performed. The results are summarized in Table 3.

[表3]


[table 3]

實施例201～實施例205中所獲得的延伸多孔膜為透氣特性或透濕特性優異、並且具有適宜的拉伸斷裂強度、拉伸斷裂伸長率、總光線透過率的膜。另外，使實施例201～實施例205中所獲得的延伸多孔膜相互摩擦時的時間平均聲級（LAeq）顯示為低值，未感覺到不舒適的聲音。進而，於破膜耐熱試驗中，於120℃、140℃、進而於160℃下亦未破膜。
其結果，認為原因在於，構成本發明的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ、及結晶熔融峰值的出現溫度滿足本發明所規定的範圍。具體而言，認為原因在於，構成實施例201～實施例205的延伸多孔膜的樹脂組成物（Z）的根據動態黏彈性測定而算出的tanδ於-20℃下成為0.100以上，因此，使樹脂組成物（Z）振動並傳播的聲音衰減，有助於抑制不舒適聲音。另外，實施例201～實施例205中所獲得的延伸多孔膜於140℃～200℃下具有結晶熔融峰值，因此顯示出具有高耐熱性。
另一方面，比較例201、比較例202中所獲得的膜未滿足本發明所規定的tanδ，因此對不舒適聲音的抑制不充分，時間平均聲級（LAeq）顯示為高值。另外，可知比較例203中所獲得的膜於140℃～200℃的範圍內不具有結晶熔融峰值，因此，雖為柔軟且不舒適聲音得以抑制的膜，但延伸多孔膜所要求的耐熱性稍微不充分。
進而，比較例204中為包含密度未滿0.850 g/cm³ 的α-烯烴共聚物的膜，但並未滿足本發明所規定的tanδ，因此對不舒適聲音的抑制並不充分。即，可知，為了兼顧對延伸多孔膜賦予必要的耐熱性、與對膜摩擦時所產生的不舒適聲音的抑制，重要的是所述tanδ及結晶熔融峰值出現的溫度兩者滿足本發明所規定的範圍。The expanded porous film obtained in each of Examples 201 to 205 was excellent in gas permeability characteristics or moisture permeability characteristics, and had a film having suitable tensile breaking strength, tensile breaking elongation, and total light transmittance. Further, the time-averaged sound level (LAeq) when the stretched porous films obtained in Examples 201 to 205 were rubbed against each other was shown to be a low value, and an uncomfortable sound was not felt. Further, in the rupture resistance test, the film was not broken at 120 ° C, 140 ° C, and further at 160 ° C.
As a result, it is considered that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) constituting the expanded porous film of the present invention and the appearance temperature of the crystal melting peak satisfy the range defined by the present invention. Specifically, it is considered that the tan δ calculated by the dynamic viscoelasticity measurement of the resin composition (Z) of the expanded porous film of Examples 201 to 205 is 0.100 or more at -20 ° C, so that the resin is made. The sound of the composition (Z) vibrating and propagating is attenuated, helping to suppress uncomfortable sound. Further, the expanded porous film obtained in Examples 201 to 205 had a crystal melting peak at 140 ° C to 200 ° C, and thus exhibited high heat resistance.
On the other hand, the films obtained in Comparative Example 201 and Comparative Example 202 did not satisfy the tan δ prescribed in the present invention, and thus the suppression of uncomfortable sound was insufficient, and the time-averaged sound level (LAeq) showed a high value. Further, it is understood that the film obtained in Comparative Example 203 does not have a crystal melting peak in the range of 140 ° C to 200 ° C. Therefore, although the film is soft and uncomfortable, the heat resistance required for extending the porous film is slightly. insufficient.
Further, in Comparative Example 204, a film containing an α-olefin copolymer having a density of less than 0.850 g/cm ³ was not satisfied with the tan δ prescribed in the present invention, and thus the suppression of uncomfortable sound was not sufficient. In other words, it is important that both the tan δ and the temperature at which the crystal melting peak occurs satisfy the requirements of the present invention in order to achieve both the heat resistance required for the extended porous film and the suppression of the uncomfortable sound generated when the film is rubbed. The scope.

以上，與當前最具實踐性、且認為較佳的實施形態相關聯，對本發明進行了說明，但本發明並不限定於本申請案說明書中所揭示的實施形態，於不違背可自申請專利範圍及說明書整體中讀取到的發明的主旨、或思想的範圍內能夠適當變更，伴隨此種變更的延伸多孔膜亦必須理解為包含於本發明的技術範圍內者。
[產業上之可利用性]The present invention has been described above in connection with the presently most practical and preferred embodiments, but the present invention is not limited to the embodiments disclosed in the specification of the present application, and does not violate the self-requestable patent. The scope and the scope of the invention as described in the entire specification and the scope of the invention can be appropriately changed, and the expanded porous film which is accompanied by such a change must also be understood as being included in the technical scope of the present invention.
[Industrial availability]

本發明的延伸多孔膜具有柔軟性與手感之類的優異觸感，並且抑制於膜的摩擦時所產生的不舒適的聲音的發生，通氣性、透濕性及強度亦優異。因而，可適宜地用於使用了延伸多孔膜的紙尿布、女性用生理用品等衛生用品；工作服、套衫、夾克、醫療用衣服、化學防護衣等衣服；以及口罩、套子、帷幕、床單、圍巾等要求通氣性或透濕性的用途中。The stretched porous film of the present invention has excellent touch such as softness and hand feeling, and suppresses generation of uncomfortable sound generated when the film is rubbed, and is excellent in air permeability, moisture permeability, and strength. Therefore, it can be suitably used for a sanitary diaper using a stretched porous film, a sanitary article for women, a work clothes, a pullover, a jacket, a medical garment, a chemical protective garment, and the like; and a mask, a cover, a curtain, a bed sheet, a scarf In applications where aeration or moisture permeability is required.

Claims (16)

一種延伸多孔膜，包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且 所述樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，空孔率為25%～80%。An extended porous film comprising a resin composition (Z) containing a thermoplastic resin and an inorganic filler (A), and The ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) to the loss elastic modulus (E'') is tan δ (=E''/E') at -20 ° C. The lower part is 0.100 or more, and the porosity is 25% to 80%. 如申請專利範圍第1項所述的延伸多孔膜，其中結晶熔融焓（ΔHm）為10 J/g～45 J/g。The elongated porous film according to claim 1, wherein the crystal melting enthalpy (ΔHm) is from 10 J/g to 45 J/g. 一種延伸多孔膜，包含含有熱塑性樹脂、無機填充材（A）的樹脂組成物（Z），且 所述樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）與損失彈性係數（E''）之比即tanδ（=E''/E'）於-20℃下為0.100以上，於140℃～200℃下具有結晶熔融峰值（Pm1）。An extended porous film comprising a resin composition (Z) containing a thermoplastic resin and an inorganic filler (A), and The ratio of the storage elastic modulus (E') calculated from the dynamic viscoelasticity measurement of the resin composition (Z) to the loss elastic modulus (E'') is tan δ (=E''/E') at -20 ° C. The lower portion is 0.100 or more, and has a crystal melting peak (Pm1) at 140 ° C to 200 ° C. 如申請專利範圍第3項所述的延伸多孔膜，其中根據所述結晶熔融峰值（Pm1）而算出的結晶熔融焓（ΔHm1）為1 J/g～10 J/g。The expanded porous film according to the third aspect of the invention, wherein the crystal melting enthalpy (ΔHm1) calculated from the crystal melting peak (Pm1) is from 1 J/g to 10 J/g. 如申請專利範圍第3項或第4項所述的延伸多孔膜，其於30℃～130℃下進而具有結晶熔融峰值（Pm2），且根據所述結晶熔融峰值（Pm2）而算出的結晶熔融焓（ΔHm2）為10 J/g～45 J/g。The extended porous film according to the third or fourth aspect of the invention, which further has a crystal melting peak (Pm2) at 30 to 130 ° C, and crystal melting calculated based on the crystal melting peak (Pm2)焓(ΔHm2) is from 10 J/g to 45 J/g. 如申請專利範圍第1項至第5項中任一項所述的延伸多孔膜，其包含含有25質量%～54質量%的所述熱塑性樹脂、46質量%～75質量%的所述無機填充材（A）的所述樹脂組成物（Z）。The stretched porous film according to any one of the items 1 to 5, which contains the thermoplastic resin in an amount of 25% by mass to 54% by mass, and the inorganic filler in an amount of 46% by mass to 75% by mass. The resin composition (Z) of the material (A). 如申請專利範圍第1項至第6項中任一項所述的延伸多孔膜，其中所述熱塑性樹脂為聚烯烴系樹脂。The stretched porous film according to any one of claims 1 to 6, wherein the thermoplastic resin is a polyolefin resin. 如申請專利範圍第7項所述的延伸多孔膜，其中所述聚烯烴系樹脂的密度為0.850 g/cm³ 以上且0.940 g/cm³ 以下。The stretched porous film according to claim 7, wherein the polyolefin-based resin has a density of 0.850 g/cm ³ or more and 0.940 g/cm ³ or less. 如申請專利範圍第7項或第8項所述的延伸多孔膜，其中，作為所述聚烯烴系樹脂，分別具有密度為0.910 g/cm³ 以上且0.940 g/cm³ 以下的聚乙烯系樹脂（B）、及密度為0.850 g/cm³ 以上且未滿0.910 g/cm³ 的軟質聚烯烴系樹脂（C）。The stretched porous film according to the above-mentioned item, wherein the polyolefin-based resin has a polyethylene resin having a density of 0.910 g/cm ³ or more and 0.940 g/cm ³ or less. (B) and a soft polyolefin-based resin (C) having a density of 0.850 g/cm ³ or more and less than 0.910 g/cm ³ . 如申請專利範圍第1項至第9項中任一項所述的延伸多孔膜，其中所述樹脂組成物（Z）的根據動態黏彈性測定而算出的儲存彈性係數（E'）於20℃下為8.0×10⁸ Pa以下。The stretched porous film according to any one of the items 1 to 9, wherein the resin composition (Z) has a storage elastic modulus (E') calculated according to a dynamic viscoelasticity measurement at 20 ° C. Below is 8.0 × 10 ⁸ Pa or less. 如申請專利範圍第1項至第10項中任一項所述的延伸多孔膜，其中透濕度為1000 g/（m² ·24h）～15000 g/（m² ·24h）。The stretched porous film according to any one of claims 1 to 10, wherein the moisture permeability is from 1000 g/(m ² ·24 h) to 15,000 g/(m ² ·24 h). 如申請專利範圍第1項至第11項中任一項所述的延伸多孔膜，其中延伸方向的拉伸斷裂強度為7 N/25 mm以上。The stretched porous film according to any one of the items 1 to 11, wherein the tensile breaking strength in the extending direction is 7 N/25 mm or more. 如申請專利範圍第1項至第12項中任一項所述的延伸多孔膜，其中延伸方向的拉伸斷裂伸長率為40%～400%。The stretched porous film according to any one of claims 1 to 12, wherein the tensile elongation at break in the extending direction is from 40% to 400%. 如申請專利範圍第1項至第13項中任一項所述的延伸多孔膜，其中於所述樹脂組成物（Z）中含有0.1質量%～8.0質量%的塑化劑（E）。The stretched porous film according to any one of claims 1 to 13, wherein the resin composition (Z) contains 0.1% by mass to 8.0% by mass of the plasticizer (E). 一種衛生用品，其使用如申請專利範圍第1項至第14項中任一項所述的延伸多孔膜。A sanitary article using the stretched porous film according to any one of claims 1 to 14. 一種衣服，其使用如申請專利範圍第1項至第14項中任一項所述的延伸多孔膜。A garment which uses the stretched porous film according to any one of claims 1 to 14.