TW201708338A - White-reflecting film for large-scale display - Google Patents

White-reflecting film for large-scale display Download PDF

Info

Publication number
TW201708338A
TW201708338A TW105122430A TW105122430A TW201708338A TW 201708338 A TW201708338 A TW 201708338A TW 105122430 A TW105122430 A TW 105122430A TW 105122430 A TW105122430 A TW 105122430A TW 201708338 A TW201708338 A TW 201708338A
Authority
TW
Taiwan
Prior art keywords
mass
thermoplastic resin
layer
particles
calcium carbonate
Prior art date
Application number
TW105122430A
Other languages
Chinese (zh)
Other versions
TWI772267B (en
Inventor
浅井真人
倉垣雅弘
岡田真一郎
大澤利洋
Original Assignee
帝人都朋軟片股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015142209A external-priority patent/JP2017026676A/en
Priority claimed from JP2015167587A external-priority patent/JP2017044886A/en
Priority claimed from JP2016077384A external-priority patent/JP6837285B2/en
Application filed by 帝人都朋軟片股份有限公司 filed Critical 帝人都朋軟片股份有限公司
Publication of TW201708338A publication Critical patent/TW201708338A/en
Application granted granted Critical
Publication of TWI772267B publication Critical patent/TWI772267B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention addresses the problem of providing a white-reflecting film that resists deflecting under heat while having exceptional reflection characteristics. The problem is overcome by a white-reflecting film that has a reflective layer A, wherein the white-reflecting film satisfies either condition (a) or condition (b) that the reflective layer A (a) comprises a thermoplastic resin composition A1 containing calcium carbonate particles in a thermoplastic resin A, the content of the calcium carbonate particles being 10-70% by mass with respect to the mass of the thermoplastic resin composition A1, or (b) comprises a thermoplastic resin composition A2 containing calcium carbonate particles in the thermoplastic resin A, and a resin that is incompatible with the thermoplastic resin A, the content of the calcium carbonate particles being 5-69% by mass with respect to the mass of the thermoplastic resin composition A2, the content of the incompatible resin being 1-40% by mass with respect to the mass of the thermoplastic resin composition A2, and the combined content of the calcium carbonate particles and the incompatible resin being 10-70% by mass with respect to the mass of the thermoplastic resin composition A2. The calcium carbonate particles have an average grain size of 0.1-1.2 [mu]m. The relationship (D90 - D10)/D50 ≤ 1.6 is satisfied, where D10, D50, and D90 are the 10%-, 50%-, and 90%-volume grain sizes, respectively, integrated from the small grain size side. The white-reflecting film has a reflectivity of at least 60%.

Description

大型顯示器用白色反射薄膜 White reflective film for large displays

本發明係關於可適合使用作為反射板的大型顯示器用白色反射薄膜。 The present invention relates to a white reflective film for a large-sized display which can be suitably used as a reflecting plate.

面光源係於背面配置反射板，藉由如此般之反射板使來自於光源的光反射至前面，而提高光的取出效率並提升輝度。 The surface light source is provided with a reflecting plate on the back surface, and the light from the light source is reflected to the front by such a reflecting plate, thereby improving the light extraction efficiency and improving the brightness.

例如，液晶顯示裝置(以下有稱為LCD之情形)之背光模組具有如下述之類型：於液晶顯示面板之背面具備有光源及反射薄膜之「直下型」背光模組；以及，於液晶顯示面板之背面配置背面為具備有反射板的導光板，並於如此般之導光板之側面具備有光源之「側光型」背光模組。作為光源，以往大多為使用CCFL，但近年由於低耗電化或薄型化而使用發光二極體(以下有稱為LED之情形)，側光型LED背光或直下型LED背光為主流。側光型背光係具有可使LCD更薄型化之優點，另一方面，直下型LED背光係由於未使用導光板而成本低。 For example, a backlight module of a liquid crystal display device (hereinafter referred to as an LCD) has a type as follows: a "direct type" backlight module having a light source and a reflective film on the back surface of the liquid crystal display panel; and a liquid crystal display The back surface of the panel is provided with a light guide plate having a reflector, and a side light type backlight module having a light source is disposed on the side of the light guide plate. In the past, CCFLs have been used as the light source. However, in recent years, light-emitting diodes (hereinafter referred to as LEDs) have been used because of low power consumption and thinning, and side-light type LED backlights or direct-lit type LED backlights have been mainstream. The edge type backlight has an advantage that the LCD can be made thinner. On the other hand, the direct type LED backlight is low in cost because the light guide plate is not used.

面光源，除此之外亦可作為用來照亮室內外 的照明用使用。 Surface light source, in addition to being used to illuminate indoor and outdoor Use for lighting.

作為反射板為經常使用含有空孔的薄膜，其係於例如聚酯等的熱塑性樹脂中添加無機粒子或非相溶之樹脂，將其藉由延伸製膜而於內部形成空孔(專利文獻1~5)。 In the case of a reflector, a film containing voids is often used, and an inorganic particle or an incompatible resin is added to a thermoplastic resin such as polyester, and a hole is formed inside by forming a film (Patent Document 1) ~5).

然而，如此般的反射板會因為來自於光源或外部環境的熱量或濕度，而有變形、撓曲之情形(以下有將如此般之撓曲稱為「熱撓曲」之情形)。當反射板撓曲時，將會產生面光源之輝度斑，例如在LCD中將會成為畫面之亮斑。 However, such a reflecting plate may be deformed or deflected due to heat or humidity from a light source or an external environment (hereinafter, the case where such a deflection is referred to as "heat deflection"). When the reflector deflects, a specular spot of the surface source will be produced, for example, it will become a bright spot on the screen in the LCD.

在此，為了解決如此般之熱撓曲問題，專利文獻6為將金屬層形成於由粒子所成的凹凸面上並將其作為反射面，藉此提唱即使是撓曲亦不易產生輝度斑之技術思想。又，於LCD之底面構件形成突起部以支撐反射板(專利文獻7)、或於反射板置入用來吸收撓曲的狹縫(專利文獻8)，藉此來檢討反射板之撓曲之改善。然而，該等之加工皆會造成成本增加。 Here, in order to solve such a problem of thermal deflection, Patent Document 6 discloses that a metal layer is formed on an uneven surface formed by particles and used as a reflecting surface, thereby making it difficult to generate a luminance spot even if it is deflected. Technical thinking. Further, a projection is formed on the bottom member of the LCD to support the reflector (Patent Document 7), or a slit for absorbing deflection is placed on the reflector (Patent Document 8), thereby observing the deflection of the reflector. improve. However, such processing will result in increased costs.

[先前技術文獻] [Previous Technical Literature] [專利文獻] [Patent Literature]

[專利文獻1]日本特開2004-330727號公報 [Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-330727

[專利文獻2]日本特開2011-11370號公報 [Patent Document 2] Japanese Patent Laid-Open Publication No. 2011-11370

[專利文獻3]日本特開2011-232369號公報 [Patent Document 3] Japanese Patent Laid-Open Publication No. 2011-232369

[專利文獻4]日本特開2013-88715號公報 [Patent Document 4] Japanese Patent Laid-Open Publication No. 2013-88715

[專利文獻5]日本特開2013-88716號公報 [Patent Document 5] Japanese Patent Laid-Open Publication No. 2013-88716

[專利文獻6]日本特開2002-100227號公報 [Patent Document 6] Japanese Patent Laid-Open Publication No. 2002-100227

[專利文獻7]日本特開2013-229185號公報 [Patent Document 7] Japanese Patent Laid-Open Publication No. 2013-229185

[專利文獻8]日本特開2014-22060號公報 [Patent Document 8] Japanese Patent Laid-Open Publication No. 2014-22060

大型顯示器係於背面底架(back chassis)具備有電路基板等，因而具有凹穴。本發明人發現，如此般之凹穴容易滞留熱量，因為如此般之熱量使得熱撓曲之問題更為顯著，而著眼於此問題。 The large display has a circuit board or the like in the back chassis, and thus has a recess. The inventors have found that such a pocket is prone to retain heat, because such heat makes the problem of heat deflection more pronounced, and the problem is addressed.

有鑑於上述先前技術，本發明之課題為提供一種具有優異反射特性之同時即使是作為大型顯示器使用亦不易熱撓曲的白色反射薄膜。 In view of the above prior art, an object of the present invention is to provide a white reflective film which has excellent reflection characteristics and is not easily heat-flexible even when used as a large-sized display.

本發明人為著眼於，含有空孔的薄膜中的空孔之存在將更容易產生熱撓曲。然而，單純減少空孔時，反射特性將會朝向減少之方向，故不宜。又著眼於，即使是藉由作為空孔形成劑的無機粒子之重量，但該重量越重時，將越容易產生熱撓曲。 The inventors have focused on the fact that the presence of voids in a film containing voids will more readily cause thermal deflection. However, when the pores are simply reduced, the reflection characteristics will be directed toward the direction of reduction, which is not preferable. Further, attention is paid to the fact that even if the weight is heavy, the heat deflection is more likely to occur even by the weight of the inorganic particles as the pore forming agent.

即，本發明為了達成上述課題，而採用下述之構成。 That is, in order to achieve the above object, the present invention adopts the following configuration.

[1].一種大型顯示器用白色反射薄膜，其係具有反射層A之白色反射薄膜，其特徵為： 前述反射層A滿足下述a或b之任一者，a.由熱塑性樹脂A中為含有碳酸鈣粒子的熱塑性樹脂組成物A1所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A1之質量為10質量%以上、70質量%以下；b.由熱塑性樹脂A中為含有碳酸鈣粒子及對該熱塑性樹脂A非相溶之樹脂的熱塑性樹脂組成物A2所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A2之質量為5質量%以上、69質量%以下，該非相溶之樹脂之含量對前述熱塑性樹脂組成物A2之質量為1質量%以上、40質量%以下，前述碳酸鈣粒子與前述非相溶之樹脂之合計含量對前述熱塑性樹脂組成物A2之質量為10質量%以上、70質量%以下，前述碳酸鈣粒子之平均粒徑為0.1μm以上、1.2μm以下，從小粒徑側起累計而得的10%體積粒徑D10、50%體積粒徑D50及90%體積粒徑D90滿足(D90-D10)/D50≦1.6，薄膜之反射率為60%以上。 [1] A white reflective film for a large display, which is a white reflective film having a reflective layer A, which is characterized by: The reflective layer A satisfies any of the following a or b, a. The thermoplastic resin A is formed of a thermoplastic resin composition A1 containing calcium carbonate particles, and the content of the calcium carbonate particles is the same as the thermoplastic resin composition A1. The mass is 10% by mass or more and 70% by mass or less; b. The thermoplastic resin A is a thermoplastic resin composition A2 containing calcium carbonate particles and a resin which is incompatible with the thermoplastic resin A, and the content of the calcium carbonate particles The mass of the thermoplastic resin composition A2 is 5% by mass or more and 69% by mass or less, and the content of the non-coherent resin is 1% by mass or more and 40% by mass or less based on the mass of the thermoplastic resin composition A2. The total content of the particles and the incompatible resin is 10% by mass or more and 70% by mass or less based on the mass of the thermoplastic resin composition A2, and the average particle diameter of the calcium carbonate particles is 0.1 μm or more and 1.2 μm or less. The 10% volume particle diameter D10, the 50% volume particle diameter D50, and the 90% volume particle diameter D90 accumulated on the radial side satisfy (D90-D10)/D50≦1.6, and the reflectance of the film is 60% or more.

[2].如上述[1]之白色反射薄膜，其中，上述反射層A為a.由熱塑性樹脂A中為含有碳酸鈣粒子的熱塑性樹脂組成物A1所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A1之質量為10質量%以上、70質量%以下。 [2] The white reflective film according to the above [1], wherein the reflective layer A is a. The thermoplastic resin A is a thermoplastic resin composition A1 containing calcium carbonate particles, and the content of the calcium carbonate particles is as described above. The mass of the thermoplastic resin composition A1 is 10% by mass or more and 70% by mass or less.

[3].如上述[1]之白色反射薄膜，其中，上述反射層A為b.由熱塑性樹脂A中為含有碳酸鈣粒子及對該熱塑性樹脂A非相溶之樹脂的熱塑性樹脂組成物A2所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A2之質量為5質量% 以上、69質量%以下，該非相溶之樹脂之含量對前述熱塑性樹脂組成物A2之質量為1質量%以上、40質量%以下，前述碳酸鈣粒子與前述非相溶之樹脂之合計含量對前述熱塑性樹脂組成物A2之質量為10質量%以上、70質量%以下。 [3] The white reflective film according to the above [1], wherein the reflective layer A is b. The thermoplastic resin composition A is a thermoplastic resin composition A2 containing a calcium carbonate particle and a resin which is incompatible with the thermoplastic resin A. The content of the calcium carbonate particles is 5% by mass based on the mass of the thermoplastic resin composition A2. The content of the non-coherent resin is 1% by mass or more and 40% by mass or less based on the mass of the thermoplastic resin composition A2, and the total content of the calcium carbonate particles and the incompatible resin is the above. The mass of the thermoplastic resin composition A2 is 10% by mass or more and 70% by mass or less.

[4].如上述[1]~[3]中任一項之大型顯示器用白色反射薄膜，其中，具有上述反射層A、與進而於至少一側之表面的表面層C，前述表面層C由含有表面層粒子之熱塑性樹脂組成物C所成，該表面層粒子之平均粒徑為2.0μm以上、50.0μm以下，該表面層粒子之含量對該熱塑性樹脂組成物C之體積為3體積%以上、50體積%以下。 [4] The white reflective film for a large display according to any one of the above [1], wherein the surface layer C having the reflective layer A and the surface on at least one side, the surface layer C The thermoplastic resin composition C containing the surface layer particles has an average particle diameter of 2.0 μm or more and 50.0 μm or less, and the content of the surface layer particles is 3% by volume based on the volume of the thermoplastic resin composition C. Above 50% by volume.

[5].如上述[1]~[4]中任一項之白色反射薄膜，其中，上述熱塑性樹脂A為共聚合聚對苯二甲酸乙二酯。 [5] The white reflective film according to any one of [1] to [4] wherein the thermoplastic resin A is a copolymerized polyethylene terephthalate.

[6].如上述[5]之白色反射薄膜，其中，上述共聚合聚對苯二甲酸乙二酯之共聚合量對該共聚合聚對苯二甲酸乙二酯之全酸成分100莫耳%為1莫耳%以上、20莫耳%以下。 [6] The white reflective film according to the above [5], wherein the copolymerization amount of the above copolymerized polyethylene terephthalate is 100 mol of the total acid component of the copolymerized polyethylene terephthalate. % is 1 mol% or more and 20 mol% or less.

[7].如上述[1]~[6]中任一項之白色反射薄膜，其中，上述反射層A對白色反射薄膜之厚度100%之厚度比率為50%以上。 [7] The white reflective film according to any one of the above [1], wherein a thickness ratio of the reflective layer A to the thickness of the white reflective film of 100% is 50% or more.

[8].如上述[1]~[7]中任一項之白色反射薄膜，其中，進而含有由熱塑性樹脂B或熱塑性樹脂組成物B所成的支撐層B。 [8] The white reflective film according to any one of the above [1] to [7], further comprising a support layer B made of a thermoplastic resin B or a thermoplastic resin composition B.

[9].一種面光源，其特徵係使用上述[1]~[8]中任一項之白 色反射薄膜。 [9] A surface light source characterized by using the white of any one of the above [1] to [8] Color reflective film.

對此，專利文獻1係使用粒度分布之標準偏差為小的硫酸鋇，由於硫酸鋇之比重為重，故為容易產生熱撓曲之樣態。又，專利文獻2~5係使用碳酸鈣粒子，雖然有揭露該90%體積粒徑D90與10%體積粒徑D10之比D90/D10，但實際上並未檢討至如本發明般狹小的粒度分布之區域。進而，專利文獻皆未意識到有關於熱撓曲之課題，而未以如此般之觀點進行檢討。 On the other hand, in Patent Document 1, the standard deviation of the particle size distribution is small barium sulfate, and since the specific gravity of barium sulfate is heavy, it is likely to cause thermal deflection. Further, in Patent Documents 2 to 5, calcium carbonate particles are used, and although the ratio D90/D10 of the 90% by volume particle diameter D90 to the 10% volume particle diameter D10 is disclosed, the particle size as in the present invention is not actually examined. The area of distribution. Furthermore, the patent documents are not aware of the subject of heat deflection, and have not been reviewed in such a manner.

藉由本發明可提供一種具有優異反射特性之同時即使是作為大型顯示器使用亦不易熱撓曲的白色反射薄膜。 According to the present invention, it is possible to provide a white reflective film which has excellent reflection characteristics and is not easily heat-flexible even when used as a large-sized display.

1‧‧‧底架 1‧‧‧ Chassis

2‧‧‧白色反射薄膜、導光板、光學薄片之層積物 2‧‧‧Layer of white reflective film, light guide plate and optical sheet

3‧‧‧正三角形型式之台 3‧‧‧Front triangle type

4‧‧‧重物 4‧‧‧ Heavy objects

[圖1]表示本發明中使用於黏貼評價之構成體之示意圖。 Fig. 1 is a schematic view showing a constitution used for evaluation of adhesion in the present invention.

[實施發明之最佳形態] [Best Mode for Carrying Out the Invention]

本發明的白色反射薄膜係具有：(樣態a)由熱塑性樹脂A中為含有特定樣態的碳酸鈣粒子的熱塑性樹脂組成物A1所成的反射層A；或 (樣態b)由熱塑性樹脂A中為含有特定樣態的碳酸鈣粒子及對該熱塑性樹脂A非相溶之樹脂(以下有稱為非相溶之樹脂之情形)的熱塑性樹脂組成物A2所成的反射層A。 The white reflective film of the present invention has: (a form a) a reflective layer A formed of a thermoplastic resin composition A1 containing a specific state of calcium carbonate particles in the thermoplastic resin A; (Form b) A thermoplastic resin composition A2 in which the thermoplastic resin A is a calcium carbonate particle containing a specific state and a resin which is incompatible with the thermoplastic resin A (hereinafter referred to as a non-compatible resin) Reflected layer A.

以下對於構成本發明的各構成成分進形詳細說明。 Hereinafter, each constituent component constituting the present invention will be described in detail.

[反射層A] [Reflective layer A]

本發明中的反射層A，係由熱塑性樹脂A中為含有碳酸鈣粒子的熱塑性樹脂組成物A1所成，或由熱塑性樹脂A中為含有碳酸鈣粒子與非相溶之樹脂的熱塑性樹脂組成物A2所成，如此般之碳酸鈣粒子及/或非相溶之樹脂係機能作為空孔形成劑並於層中含有空孔，而為呈現白色之層。尚，有將熱塑性樹脂組成物A1與熱塑性樹脂組成物A2總稱為熱塑性樹脂組成物A之情形。反射層A係藉由如此般之空孔而發揮反射機能。反射層A之波長550nm的反射率較佳為80%以上，更佳為90%以上，特佳為95%以上。藉此可容易使白色反射薄膜之反射率成為較佳範圍。 The reflective layer A in the present invention is composed of a thermoplastic resin composition A1 containing a calcium carbonate particle in the thermoplastic resin A, or a thermoplastic resin composition containing a calcium carbonate particle and an incompatible resin in the thermoplastic resin A. As a result of A2, such a calcium carbonate particle and/or an incompatible resin system can function as a pore former and contain voids in the layer to form a white layer. In addition, the thermoplastic resin composition A1 and the thermoplastic resin composition A2 are collectively referred to as the thermoplastic resin composition A. The reflective layer A exhibits a reflection function by such a void. The reflectance of the reflection layer A at a wavelength of 550 nm is preferably 80% or more, more preferably 90% or more, and particularly preferably 95% or more. Thereby, the reflectance of the white reflective film can be easily made into a preferable range.

反射層A，如同上述般係於層中具有空孔者，如此般之空孔之體積對反射層A之體積所佔之比例(亦即，空孔體積率)為15體積%以上，以70體積%以下為較佳。藉由設定為如此般之範圍可提高反射率之提升效果，而容易得到如上述般之反射率。又，可提高延伸製膜性之提升效果。當空孔體積率過低時，會有難以得到較佳 反射率之傾向。就如此般之觀點而言，反射層A中的空孔體積率更佳為30體積%以上，特佳為40體積%以上。另一方面，過高時，延伸製膜性之提升效果會有變低之傾向。就如此般之觀點而言，反射層A中的空孔體積率更佳為65體積%以下，特佳為60體積%以下。 The reflective layer A has a void in the layer as described above, and the ratio of the volume of the void to the volume of the reflective layer A (that is, the void volume ratio) is 15% by volume or more, 70 The volume % or less is preferred. By setting such a range, the effect of improving the reflectance can be improved, and the reflectance as described above can be easily obtained. Moreover, the effect of improving the film forming property can be improved. When the void volume ratio is too low, it may be difficult to obtain better The tendency of reflectivity. From such a viewpoint, the void volume ratio in the reflective layer A is more preferably 30% by volume or more, and particularly preferably 40% by volume or more. On the other hand, when it is too high, the effect of improving the film forming property tends to be low. From such a viewpoint, the void volume ratio in the reflective layer A is more preferably 65 vol% or less, particularly preferably 60 vol% or less.

空孔體積率係能夠藉由調整反射層A中的碳酸鈣粒子之大小或量、非相溶之樹脂之種類或量來達成。 The void volume ratio can be achieved by adjusting the size or amount of the calcium carbonate particles in the reflective layer A, and the type or amount of the incompatible resin.

(熱塑性樹脂A) (thermoplastic resin A)

作為構成反射層A的熱塑性樹脂A，可舉例如由聚酯、聚烯烴、聚苯乙烯、丙烯酸所成的熱塑性樹脂。其中，就可得到機械特性及熱安定性為優異的白色反射薄膜之觀點而言，較佳為聚酯。 The thermoplastic resin A constituting the reflective layer A may, for example, be a thermoplastic resin composed of polyester, polyolefin, polystyrene or acrylic. Among them, from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability, polyester is preferred.

作為如此般之聚酯，較佳為使用由二羧酸成分與二醇成分所成的聚酯。作為該二羧酸成分，可舉例對苯二甲酸成分、間苯二甲酸成分、2,6-萘二羧酸成分、4,4’-二苯基二羧酸成分、己二酸成分、癸二酸成分。作為二醇成分，可舉例乙二醇成分、1,4-丁二醇成分、1,4-環己烷二甲醇成分、1,6-己二醇成分。該等的聚酯之中亦以芳香族聚酯為較佳，特佳為聚對苯二甲酸乙二酯。聚酯及較佳為聚對苯二甲酸乙二酯可為均聚物，但就將薄膜以單軸或雙軸進行延伸之際可抑制結晶化並提高延伸製膜性之提升效果之觀點而言，較佳為共聚合聚酯及進而的共聚合聚對苯二甲酸乙二酯。作為共聚合成分，可舉例上述的二 羧酸成分或二醇成分，但就所謂的耐熱性為高、延伸製膜性之提升效果為高之觀點而言，較佳為間苯二甲酸成分、2,6-萘二羧酸成分。共聚合成分之含有比例，係以聚酯的全二羧酸成分100莫耳%作為基準，例如在1莫耳%以上，較佳為2莫耳%以上，更佳為3莫耳%以上，特佳為7莫耳%以上，又，例如為20莫耳%以下，較佳為18莫耳%以下，更佳為15莫耳%以下，特佳為11莫耳%以下。藉由將共聚合成分之比例設定為該範圍，可使延伸製膜性之提升效果為優異。又，熱尺寸安定性為優異。進而可更提升熱撓曲之抑制效果。 As such a polyester, a polyester composed of a dicarboxylic acid component and a diol component is preferably used. Examples of the dicarboxylic acid component include a terephthalic acid component, an isophthalic acid component, a 2,6-naphthalenedicarboxylic acid component, a 4,4'-diphenyldicarboxylic acid component, an adipic acid component, and an anthracene. Diacid component. The diol component may, for example, be an ethylene glycol component, a 1,4-butanediol component, a 1,4-cyclohexanedimethanol component or a 1,6-hexanediol component. Among these polyesters, an aromatic polyester is also preferred, and polyethylene terephthalate is particularly preferred. The polyester and preferably polyethylene terephthalate may be a homopolymer, but the film may be inhibited from crystallization by uniaxial or biaxial stretching, and the effect of improving the film forming property is improved. Preferably, the copolymerized polyester and further copolymerized polyethylene terephthalate are preferred. As the copolymerization component, the above two can be exemplified The carboxylic acid component or the diol component is preferably an isophthalic acid component or a 2,6-naphthalenedicarboxylic acid component from the viewpoint that the heat resistance is high and the effect of improving the film forming property is high. The content ratio of the copolymerization component is, for example, 1 mol% or more, preferably 2 mol% or more, and more preferably 3 mol% or more, based on 100 mol% of the total dicarboxylic acid component of the polyester. More preferably, it is 7 mol% or more, and is, for example, 20 mol% or less, preferably 18 mol% or less, more preferably 15 mol% or less, and particularly preferably 11 mol% or less. By setting the ratio of the copolymerization component to this range, the effect of improving the film formability of stretching can be excellent. Moreover, the thermal dimensional stability is excellent. In turn, the suppression effect of heat deflection can be further improved.

如此般之熱塑性樹脂A，融點較佳為200℃以上、280℃以下。藉此可更容易抑制熱撓曲。過低時，熱撓曲之抑制效果會有變低之傾向，過高時，操作會有變難之傾向。就如此般之觀點而言，又較佳為205℃以上，更佳為210℃以上，又，又較佳為275℃以下，更佳為265℃以下。 In such a thermoplastic resin A, the melting point is preferably 200 ° C or more and 280 ° C or less. Thereby, heat deflection can be more easily suppressed. When it is too low, the effect of suppressing heat deflection tends to be low, and when it is too high, the operation tends to be difficult. From such a viewpoint, it is preferably 205 ° C or higher, more preferably 210 ° C or higher, and further preferably 275 ° C or lower, more preferably 265 ° C or lower.

尚，作為構成本發明中的反射層A的熱塑性樹脂A，亦可為較佳的熱塑性樹脂的聚酯、與和該聚酯為相異的其他的熱塑性樹脂之混合物。 Further, the thermoplastic resin A constituting the reflective layer A in the present invention may be a mixture of a polyester of a preferred thermoplastic resin and another thermoplastic resin different from the polyester.

(碳酸鈣粒子) (calcium carbonate particles)

本發明中反射層A係含有具備有特定樣態的碳酸鈣粒子來作為空孔形成劑。 In the present invention, the reflective layer A contains calcium carbonate particles having a specific state as a pore forming agent.

本發明中的碳酸鈣粒子之平均粒徑為0.1μm 以上、1.2μm以下，又，(D90-D10)/D50為1.6以下。在此，D10、D50及D90係分別的碳酸鈣粒子的小粒徑側起累計而得的10%體積粒徑、50%體積粒徑及90%體積粒徑。藉由採用如此般樣態的碳酸鈣粒子，可具有高反射率之同時並抑制熱撓曲。即，當粗大空孔存在時，因此容易產生熱撓曲，反而是藉由採用平均粒徑小且粒度分布為銳狀(sharp)的碳酸鈣粒子，並使其成為內部存在有多數相對為小的空孔(以下有稱為微孔之情形)的薄膜之樣態，可抑制因粗大空孔所造成的熱撓曲。當粒度分布為寬廣時，變得會有粗大粒子之存在，因此容易形成粗大空孔。又，關於空孔與熱塑性樹脂之界面之量，可同時抑制該界面之量之減少而得到高反射率。更，由於碳酸鈣粒子之比重相對為小，故粒子與熱塑性樹脂之質量差或密度差為小，而不易在空孔以外之部分產生局部性的密度差。因此亦可抑制熱撓曲。 The average particle diameter of the calcium carbonate particles in the present invention is 0.1 μm. The above is 1.2 μm or less, and (D90-D10)/D50 is 1.6 or less. Here, D10, D50, and D90 are 10% by volume particle diameter, 50% by volume particle diameter, and 90% by volume particle diameter of the small particle diameter side of each of the calcium carbonate particles. By using such a state of calcium carbonate particles, it is possible to have high reflectance while suppressing heat deflection. That is, when coarse pores are present, heat deflection is likely to occur, and instead, calcium carbonate particles having a small average particle diameter and a sharp particle size distribution are used, and the majority is relatively small. The state of the film of the void (hereinafter referred to as a micropore) suppresses heat deflection caused by the coarse void. When the particle size distribution is broad, it becomes possible to have coarse particles, so that it is easy to form coarse pores. Further, regarding the amount of the interface between the pores and the thermoplastic resin, it is possible to simultaneously suppress the decrease in the amount of the interface and obtain a high reflectance. Further, since the specific gravity of the calcium carbonate particles is relatively small, the difference in mass or density difference between the particles and the thermoplastic resin is small, and a local density difference is not easily generated in portions other than the pores. Therefore, heat deflection can also be suppressed.

碳酸鈣粒子之平均粒徑若過大時，會有容易形成粗大空孔之傾向，而無法抑制熱撓曲。故平均粒徑較佳為1.1μm以下，又較佳為1.0μm以下，更佳為0.95μm以下，特佳為0.9μm以下。另一方面，過小時亦由於粒子彼此凝集而成為形成粗大空孔之原因，而非常難以得到如前述般的碳酸鈣粒子。就如此般之觀點而言，平均粒徑較佳為0.3μm以上，又較佳為0.5μm以上，更佳為0.6μm以上。 When the average particle diameter of the calcium carbonate particles is too large, coarse voids tend to be formed, and heat deflection cannot be suppressed. Therefore, the average particle diameter is preferably 1.1 μm or less, more preferably 1.0 μm or less, still more preferably 0.95 μm or less, and particularly preferably 0.9 μm or less. On the other hand, when the particles are too small, the particles become aggregated to form coarse pores, and it is very difficult to obtain calcium carbonate particles as described above. From such a viewpoint, the average particle diameter is preferably 0.3 μm or more, more preferably 0.5 μm or more, and still more preferably 0.6 μm or more.

又，在其他的樣態中，碳酸鈣粒子之平均粒 徑若過大時，則熱撓曲之抑制將會變難，相反地，即使是過小，亦由於凝集而變得容易形成粗大空孔，熱撓曲之抑制將有變困難之情形，就熱撓曲抑制與反射率提升之均衡之觀點、及亦有成本之觀點，某程度上較大者亦有較佳之情形。就如此般之觀點而言，碳酸鈣粒子之平均粒徑較佳為1.2μm以下，又較佳為1.18μm以下，更佳為1.15μm以下，又，較佳為0.6μm以上，又較佳為0.8μm以上，更佳為1.01μm以上，特佳為1.02μm以上，最佳為1.05μm以上。 Also, in other forms, the average particle size of calcium carbonate particles If the diameter is too large, the suppression of heat deflection will become difficult. Conversely, even if it is too small, it will become easy to form coarse pores due to agglomeration, and the suppression of heat deflection will become difficult, and it will be hot. The view of the balance between the suppression of the curvature and the improvement of the reflectivity, as well as the point of view of the cost, is somewhat better for a larger degree. In view of the above, the average particle diameter of the calcium carbonate particles is preferably 1.2 μm or less, more preferably 1.18 μm or less, still more preferably 1.15 μm or less, still more preferably 0.6 μm or more, and still more preferably It is 0.8 μm or more, more preferably 1.01 μm or more, particularly preferably 1.02 μm or more, and most preferably 1.05 μm or more.

(D90-D10)/D50，就上述之觀點而言，以越小者為越佳，又較佳為1.5以下，更佳為1.4以下。理論上下限為0，但實際上以0.1以上為較佳。 (D90-D10)/D50, from the above viewpoints, the smaller the smaller, the more preferably 1.5 or less, more preferably 1.4 or less. The theoretical upper limit is 0, but actually it is preferably 0.1 or more.

為使滿足如上述般之樣態，本發明中作為碳酸鈣粒子特佳為採用由合成碳酸鈣所成之粒子(以下亦有稱為合成碳酸鈣粒子之情形)。作為碳酸鈣粒子有由天然碳酸鈣所成之粒子(以下亦有稱為天然碳酸鈣粒子之情形)、與合成碳酸鈣粒子，通常為使用天然碳酸鈣粒子。然而，天然碳酸鈣粒子時將有難以滿足上述樣態之傾向，而有難以達成本發明之課題之傾向。 In order to satisfy the above-described state, the calcium carbonate particles in the present invention are particularly preferably those obtained by synthesizing calcium carbonate (hereinafter also referred to as synthetic calcium carbonate particles). The calcium carbonate particles include particles derived from natural calcium carbonate (hereinafter also referred to as natural calcium carbonate particles) and synthetic calcium carbonate particles, and usually natural calcium carbonate particles are used. However, in the case of natural calcium carbonate particles, it tends to be difficult to satisfy the above-described state, and it is difficult to achieve the object of the present invention.

作為使碳酸鈣粒子含有於聚酯樹脂中之方法，可使用以往公知的各種方法。作為該代表性之方法，可舉例下述般之方法。 As a method of containing the calcium carbonate particles in the polyester resin, various conventionally known methods can be used. As such a representative method, the following method can be exemplified.

(甲)在聚酯樹脂之合成時之酯化階段或是酯交換反應結束後進行添加之方法。 (A) A method of adding in the esterification stage at the time of synthesis of the polyester resin or after completion of the transesterification reaction.

(乙)對所得之聚酯樹脂進行添加並進行熔融混練之方法。 (B) A method of adding the obtained polyester resin and performing melt kneading.

(丙)在上述(甲)或(乙)之方法中，對聚酯樹脂添加大量的碳酸鈣粒子來製造母粒，將母粒與作為稀釋聚合物的聚酯樹脂進行混練，使聚酯樹脂中含有指定量的碳酸鈣粒子之方法。 (c) In the above method (a) or (b), a large amount of calcium carbonate particles are added to the polyester resin to produce a master batch, and the master batch is kneaded with a polyester resin as a diluted polymer to obtain a polyester resin. A method of containing a specified amount of calcium carbonate particles.

(丁)直接使用上述(丙)之母粒之方法。 (D) The method of directly using the above (C) masterbatch.

(碳酸鈣粒子之表面處理) (surface treatment of calcium carbonate particles)

本發明中的碳酸鈣粒子，較佳為藉由表面處理劑來施予表面處理。藉此，可使碳酸鈣粒子表面之Ca活性鈍化，使成為表面之Ca活性為鈍化的碳酸鈣粒子，可更抑制氣痕(gas mark)之產生。作為如此般之表面處理劑，可舉例磷酸、亞磷酸、膦酸、或該等的衍生物等的磷化合物、及、硬脂酸等的脂肪酸、矽烷偶合劑等。本發明中，其中較佳為藉由磷化合物的表面處理，做為如此般之磷化合物，具體而言較佳可舉例如磷酸、亞磷酸、磷酸三甲酯、磷酸三丁酯、磷酸三苯酯、磷酸單或二甲酯、亞磷酸三甲酯、甲基膦酸、甲基磺酸二乙酯、苯基膦酸二甲酯、苯基膦酸二乙酯等。其中，以磷酸、亞磷酸及該等的酯成形衍生物為較佳。本發明中，最佳為以磷酸三甲酯來進行表面處理。該等磷化合物可單獨使用，又亦可併用2種以上。 The calcium carbonate particles in the present invention are preferably subjected to a surface treatment by a surface treating agent. Thereby, the Ca activity on the surface of the calcium carbonate particles can be inactivated, and the calcium carbonate particles whose surface Ca activity is passivated can be suppressed, and the generation of gas marks can be further suppressed. As such a surface treatment agent, a phosphorus compound such as phosphoric acid, phosphorous acid, phosphonic acid, or a derivative thereof, a fatty acid such as stearic acid, a decane coupling agent, or the like can be exemplified. In the present invention, it is preferable to use a surface treatment of a phosphorus compound as such a phosphorus compound, and specifically, for example, phosphoric acid, phosphorous acid, trimethyl phosphate, tributyl phosphate, triphenyl phosphate is preferable. Ester, mono or dimethyl phosphate, trimethyl phosphite, methylphosphonic acid, diethyl methanesulfonate, dimethyl phenylphosphonate, diethyl phenylphosphonate, and the like. Among them, phosphoric acid, phosphorous acid, and such ester-formed derivatives are preferred. In the present invention, it is preferred to carry out surface treatment with trimethyl phosphate. These phosphorus compounds may be used singly or in combination of two or more.

碳酸鈣粒子之表面處理方法未特別限定，可採用以往公知的方法。例如藉由磷化合物來施予表面處理 時，較佳為採用將磷化合物與碳酸鈣粒子以物理性混合之方法(物理性混合方法)。作為如此般之物理性混合方法未特別限定，可舉例如下述方法：使用例如輥轉動磨機、高速旋轉式粉碎機、球磨機、噴射磨機等的各種粉碎機，將碳酸鈣粉碎之同時以磷化合物進行表面處理之方法；或，使用容器本身會旋轉的容器旋轉型混合機、在固定容器內為具有旋轉翼或可吹入氣流的容器固定型混合機等，來進行表面處理之方法。具體而言較佳為諾塔混合器、螺條混合機、亨舍爾攪拌機等的混合機。 The surface treatment method of the calcium carbonate particles is not particularly limited, and a conventionally known method can be employed. For example, by applying a phosphorus compound to a surface treatment In the case of using a method in which a phosphorus compound and a calcium carbonate particle are physically mixed (physical mixing method). The physical mixing method is not particularly limited, and for example, a method of using a pulverizer such as a roll rotating mill, a high-speed rotary pulverizer, a ball mill, or a jet mill to pulverize calcium carbonate while using phosphorus is exemplified. A method of surface treatment of a compound; or a method of surface treatment using a container rotary mixer in which the container itself rotates, a container-fixed mixer having a rotary wing or a blown air flow in the fixed container. Specifically, a mixer such as a Nauta mixer, a ribbon blender, or a Henschel mixer is preferred.

又，此時的處理條件未特別限定，就碳酸鈣粒子對聚酯之分散性、聚酯之高溫滞留時之異物產生、發泡之觀點而言，處理溫度較佳為30℃以上，更佳為50℃以上，特佳為90℃以上。處理時間以設定為5小時以內為較佳，更佳為3小時以內，特佳為2小時以內。又，磷化合物可與碳酸鈣粒子同時混合，又，亦可事先裝入碳酸鈣粒子後再添加磷化合物。此時，可使磷化合物滴下、亦可使其噴霧，進而亦可使其溶解或分散於水或醇等中。 In addition, the processing conditions at this time are not particularly limited, and the treatment temperature is preferably 30° C. or more from the viewpoint of dispersibility of the calcium carbonate particles, generation of foreign matter at the time of high temperature retention of the polyester, and foaming. It is 50 ° C or more, and particularly preferably 90 ° C or more. The treatment time is preferably set to be within 5 hours, more preferably within 3 hours, and particularly preferably within 2 hours. Further, the phosphorus compound may be mixed with the calcium carbonate particles at the same time, or the phosphorus compound may be added after the calcium carbonate particles are added in advance. In this case, the phosphorus compound may be dropped or sprayed, or it may be dissolved or dispersed in water or alcohol.

又，本發明中，亦可將碳酸鈣粒子之表面處理劑添加、調配於聚酯中，接著，對此添加碳酸鈣粒子來進行碳酸鈣之表面處理。例如可在聚酯之製造(即，聚合反應之結束)為止之任意階段、或在聚合反應結束後至進行熔融混練為止之階段添加表面處理劑。 Further, in the present invention, a surface treatment agent for calcium carbonate particles may be added and formulated in a polyester, and then calcium carbonate particles may be added thereto to carry out surface treatment of calcium carbonate. For example, a surface treatment agent may be added at any stage up to the production of the polyester (that is, at the end of the polymerization reaction) or at the stage of the melt-kneading after the completion of the polymerization reaction.

上述表面處理步驟中的表面處理劑之添加量，只要是可使碳酸鈣粒子表面之Ca活性充分鈍化之量 即可，例如磷元素之量對碳酸鈣粒子之質量為0.1質量%以上之量。另一方面，當過度添加時，薄膜中會殘留大量的磷化合物，就環境之觀點而言為不宜，又，就可抑制在擠壓機內等的碳酸鈣粒子彼此之凝集之觀點而言，較佳為5質量%以下，又較佳為2質量%以下，更佳為1質量%以下，特佳為0.5質量%以下。 The amount of the surface treatment agent added in the above surface treatment step is such that the Ca activity on the surface of the calcium carbonate particles is sufficiently passivated. For example, the amount of the phosphorus element may be 0.1% by mass or more based on the mass of the calcium carbonate particles. On the other hand, when it is excessively added, a large amount of phosphorus compound remains in the film, which is not preferable from the viewpoint of the environment, and it is possible to suppress the aggregation of calcium carbonate particles in the extruder or the like. It is preferably 5% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less.

(非相溶之樹脂) (non-compatible resin)

本發明中的樣態b中，反射層A係含有非相溶之樹脂來作為空孔形成劑。 In the aspect b of the present invention, the reflective layer A contains an incompatible resin as a pore former.

作為如此般之非相溶之樹脂，只要是與構成反射層A的熱塑性樹脂A為非相溶即可，未特別限定。例如當熱塑性樹脂A為聚酯時，較佳為聚乙烯、聚丙烯、聚甲基戊烯等的聚烯烴樹脂、環烯烴樹脂、聚苯乙烯樹脂、聚丙烯酸酯樹脂、聚碳酸酯樹脂、聚丙烯腈樹脂、聚苯硫醚樹脂、氟樹脂等。該等可單獨使用，亦可併用2種類以上。又，可為均聚物亦可為共聚物。特別是與熱塑性樹脂A(作為如此般之熱塑性樹脂A較佳為聚酯)之臨界表面張力差越大者越佳。又，較佳為不易因延伸後的熱處理而造成變形的樹脂。具體而言，較佳為聚烯烴系樹脂。作為聚烯烴系樹脂，可舉例聚乙烯、聚丙烯、聚甲基戊烯等的聚烯烴樹脂、及該等的共聚物。該等之中，特佳為環烯烴共聚物的乙烯與雙環烯烴之共聚物。 The resin which is incompatible as described above is not particularly limited as long as it is incompatible with the thermoplastic resin A constituting the reflective layer A. For example, when the thermoplastic resin A is a polyester, a polyolefin resin such as polyethylene, polypropylene, polymethylpentene, a cycloolefin resin, a polystyrene resin, a polyacrylate resin, a polycarbonate resin, or a poly An acrylonitrile resin, a polyphenylene sulfide resin, a fluororesin, or the like. These may be used alone or in combination of two or more types. Further, the homopolymer may be a copolymer. In particular, the larger the difference in critical surface tension with the thermoplastic resin A (preferably, the thermoplastic resin A is preferably a polyester), the better. Further, a resin which is not easily deformed by heat treatment after stretching is preferred. Specifically, a polyolefin resin is preferred. The polyolefin resin may, for example, be a polyolefin resin such as polyethylene, polypropylene or polymethylpentene, or a copolymer thereof. Among these, a copolymer of ethylene and a bicyclic olefin of a cycloolefin copolymer is particularly preferred.

又，非相溶之樹脂之玻璃轉移溫度較佳為 180℃以上、220℃以下，更佳為190℃以上、220℃以下。玻璃轉移溫度較180℃為低之區域時，在薄膜製造步驟中的熱處理步驟中，於延伸時所展現出的空孔會變形，而引起空孔尺寸之不均勻性，會有容易形成粗大空孔之傾向，熱撓曲抑制之提升效果會有變低之傾向。又，較220℃為高之區域時，在與構成反射層A的熱塑性樹脂A進行熔融混練之際，非相溶之樹脂無法充分熔融而有難以促進微分散化之傾向，因此熱撓曲抑制之提升效果亦有變低之傾向。尚，控制非相溶之樹脂之玻璃轉移溫度之方法，例如藉由控制直鏈的烯烴部(作為如此般之烯烴部例如乙烯部)、與環烯烴部(作為如此般之環烯烴部例如亞甲基-降莰烯部)之共聚合比率，可任意地變更該玻璃轉移溫度，例如為了提高玻璃轉移溫度，可藉由提高環烯烴部之共聚合比率來達成。 Moreover, the glass transition temperature of the incompatible resin is preferably 180 ° C or more and 220 ° C or less, more preferably 190 ° C or more and 220 ° C or less. When the glass transition temperature is lower than 180 ° C, in the heat treatment step in the film manufacturing step, the voids exhibited during the stretching may be deformed, causing unevenness of the pore size, and the formation of coarse voids may be easily formed. The tendency of the hole, the lifting effect of the heat deflection inhibition tends to be lower. In addition, when the thermoplastic resin A constituting the reflective layer A is melt-kneaded in a region where the temperature is higher than 220 ° C, the incompatible resin is not sufficiently melted and the microdispersion tends to be promoted, so that the heat deflection is suppressed. The improvement effect also has a tendency to become lower. Further, a method of controlling the glass transition temperature of the incompatible resin, for example, by controlling a linear olefin portion (as such an olefin portion such as a vinyl portion), and a cycloolefin portion (as a cycloolefin portion such as a sub The glass transition temperature can be arbitrarily changed by the copolymerization ratio of the methyl-norbornene moiety. For example, in order to increase the glass transition temperature, it can be achieved by increasing the copolymerization ratio of the cycloolefin portion.

作為較佳使用的非相溶之樹脂，可舉例Polyplastics公司的TOPAS(註冊商標)COC系列，例如grade 6017S-04等。 As a preferably used non-compatible resin, a TOPAS (registered trademark) COC series of Polyplastics, for example, grade 6017S-04, etc., can be exemplified.

(樣態a中的碳酸鈣粒子之含量) (content of calcium carbonate particles in the form a)

樣態a中，反射層A係由含有碳酸鈣粒子的熱塑性樹脂組成物A1所成者，如此般之熱塑性樹脂組成物A1中的碳酸鈣粒子之含量，以如此般之熱塑性樹脂組成物A1之質量作為基準是10質量%以上、70質量%以下。藉此可容易成為上述較佳的空孔體積率，因而可成為高反射 率。又，可抑制熱撓曲。進而，可提高延伸製膜性之提升效果。若含量過少時，反射率將會變低。另一方面，當含有率過多時，空孔會變得過多而無法抑制熱撓曲。就該等之觀點而言，含量較佳為15質量%以上，又較佳為20質量%以上，又，較佳為60質量%以下，又較佳為50質量%以下。 In the aspect a, the reflective layer A is composed of a thermoplastic resin composition A1 containing calcium carbonate particles, and thus the content of the calcium carbonate particles in the thermoplastic resin composition A1 is such that the thermoplastic resin composition A1 is The mass is 10% by mass or more and 70% by mass or less based on the standard. Thereby, the above-mentioned preferable void volume ratio can be easily obtained, and thus high reflection can be achieved. rate. Moreover, heat deflection can be suppressed. Further, the effect of improving the film forming property can be improved. If the content is too small, the reflectance will become low. On the other hand, when the content rate is too large, the pores become excessive and the heat deflection cannot be suppressed. From the viewpoint of the above, the content is preferably 15% by mass or more, more preferably 20% by mass or more, further preferably 60% by mass or less, and more preferably 50% by mass or less.

(樣態b中的碳酸鈣粒子與非相溶之樹脂之含量) (content of calcium carbonate particles and incompatible resin in the form b)

樣態b中，構成反射層A的熱塑性樹脂組成物A2中的碳酸鈣粒子之含量，以如此般之熱塑性樹脂組成物A2之質量作為基準是5質量%以上、69質量%以下。藉此可容易成為上述較佳的空孔體積率，且藉此可使成為高反射率。又，可抑制熱撓曲。進而，可提高延伸製膜性之提升效果。含量若過少時，反射率會變低。另一方面，含有率若過多時，空孔會變多而無法抑制熱撓曲。就該等之觀點而言，含量較佳為10質量%以上，又較佳為15質量%以上，又，較佳為60質量%以下，又較佳為50質量%以下。 In the aspect b, the content of the calcium carbonate particles in the thermoplastic resin composition A2 constituting the reflective layer A is 5% by mass or more and 69% by mass or less based on the mass of the thermoplastic resin composition A2. Thereby, the above-described preferable void volume ratio can be easily obtained, and thereby high reflectance can be obtained. Moreover, heat deflection can be suppressed. Further, the effect of improving the film forming property can be improved. If the content is too small, the reflectance will become low. On the other hand, if the content ratio is too large, the pores become large and heat deflection cannot be suppressed. From the viewpoint of the above, the content is preferably 10% by mass or more, more preferably 15% by mass or more, further preferably 60% by mass or less, and more preferably 50% by mass or less.

樣態b中，構成反射層A的熱塑性樹脂組成物A2中的非相溶之樹脂之含量，以如此般之熱塑性樹脂組成物A2之質量作為基準是1質量%以上、40質量%以下。藉此可以抑制熱撓曲之狀態下而容易成為上述較佳的空孔體積率，且藉此可使成為高反射率。進而，可提高延伸製膜性之提升效果。含量若過少時，反射率會變低。另 一方面，含有率若過多時，空孔會變多而無法抑制熱撓曲。又，薄膜中存在著大量的耐熱性相對為低的非相溶之樹脂，因此亦有難以抑制熱撓曲之傾向。就該等之觀點而言，含量較佳為5質量%以上，又較佳為10質量%以上，又，較佳為35質量%以下，又較佳為30質量%以下。 In the aspect b, the content of the incompatible resin in the thermoplastic resin composition A2 constituting the reflective layer A is 1% by mass or more and 40% by mass or less based on the mass of the thermoplastic resin composition A2. Thereby, it is possible to suppress the heat deflection state, and it is easy to achieve the above-described preferable void volume ratio, and thereby it is possible to achieve high reflectance. Further, the effect of improving the film forming property can be improved. If the content is too small, the reflectance will become low. another On the other hand, if the content ratio is too large, the pores become large and the heat deflection cannot be suppressed. Further, since a large amount of incompatible resin having a relatively low heat resistance exists in the film, there is a tendency that it is difficult to suppress heat deflection. From the viewpoint of the above, the content is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 35% by mass or less, and more preferably 30% by mass or less.

樣態b中，構成反射層A的熱塑性樹脂組成物A2中的碳酸鈣粒子與非相溶之樹脂之合計含量，以如此般之熱塑性樹脂組成物A2之質量作為基準是10質量%以上、70質量%以下。藉此可以抑制熱撓曲之狀態下而容易成為上述較佳的空孔體積率，且藉此可使成為高反射率。進而，可提高延伸製膜性之提升效果。合計含量若過少時，反射率會變低。另一方面，合計含有率若過多時，上述碳酸鈣粒子之含量過多時或非相溶之樹脂之含量過多時為相同之理由，將無法抑制熱撓曲。就該等之觀點而言，含量較佳為15質量%以上，又較佳為20質量%以上，又，較佳為65質量%以下，又較佳為60質量%以下。 In the aspect b, the total content of the calcium carbonate particles and the incompatible resin in the thermoplastic resin composition A2 constituting the reflective layer A is 10% by mass or more based on the mass of the thermoplastic resin composition A2. Below mass%. Thereby, it is possible to suppress the heat deflection state, and it is easy to achieve the above-described preferable void volume ratio, and thereby it is possible to achieve high reflectance. Further, the effect of improving the film forming property can be improved. If the total content is too small, the reflectance will become low. On the other hand, when the total content is too large, when the content of the calcium carbonate particles is too large or the content of the incompatible resin is too large, the heat deflection cannot be suppressed. From the viewpoint of the above, the content is preferably 15% by mass or more, more preferably 20% by mass or more, further preferably 65% by mass or less, and more preferably 60% by mass or less.

(其他的成分) (other ingredients)

反射層A(此即可為構成該反射層A的熱塑性樹脂組成物A)，在不妨礙本發明目的之範圍內，可含有其他的成分的例如紫外線吸收劑、抗氧化劑、抗靜電劑、螢光增白劑、蠟。又，只要是不妨礙本發明目的，可含有與上述碳酸鈣粒子或非相溶之樹脂為相異的粒子或樹脂等的空孔 形成劑。 The reflective layer A (which may be the thermoplastic resin composition A constituting the reflective layer A) may contain other components such as an ultraviolet absorber, an antioxidant, an antistatic agent, and a firefly, within a range not inhibiting the object of the present invention. Light whitening agent, wax. Further, as long as it does not impair the object of the present invention, it may contain voids such as particles or resins which are different from the calcium carbonate particles or the incompatible resin. Forming agent.

[支撐層B] [support layer B]

本發明的白色反射薄膜，可進而於上述反射層A具有由熱塑性樹脂B或熱塑性樹脂組成物B所成的支撐層B，該「熱塑性樹脂組成物B」係於熱塑性樹脂B中添加粒子等而成者。藉由如此般之支撐層B，可提升延伸製膜性，或可進而抑制熱撓曲。較佳如下：將空孔為較反射層A少的支撐層B、或耐熱性為盡可能高的組成所成的支撐層B設置於反射層A之至少單面，藉此可進而抑制因熱量所造成的局部性變形，並可進而抑制熱撓曲。 In the white reflective film of the present invention, the reflective layer A may further have a support layer B made of a thermoplastic resin B or a thermoplastic resin composition B, and the "thermoplastic resin composition B" may be added to the thermoplastic resin B by adding particles or the like. Adult. By such a support layer B, the stretch film forming property can be improved, or the heat deflection can be suppressed. Preferably, the support layer B having a smaller number of pores than the reflective layer A or the support layer B having a composition having a heat resistance as high as possible is provided on at least one side of the reflective layer A, thereby further suppressing heat generation The resulting local deformation can further inhibit heat deflection.

以下，對於本發明中的支撐層B進行詳述。 Hereinafter, the support layer B in the present invention will be described in detail.

(熱塑性樹脂B) (thermoplastic resin B)

作為構成本發明中的支撐層B的熱塑性樹脂B，可使用與上述構成反射層A的熱塑性樹脂A為相同的熱塑性樹脂。其中，就得到機械特性及熱安定性為優異的白色反射薄膜之觀點而言，較佳為聚酯。 As the thermoplastic resin B constituting the support layer B in the present invention, the same thermoplastic resin as the thermoplastic resin A constituting the reflective layer A described above can be used. Among them, from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability, polyester is preferred.

作為如此般之聚酯，可使用與上述反射層A中的聚酯為相同的聚酯。該等的聚酯之中，就得到機械特性及熱安定性為優異的白色反射薄膜之觀點而言，較佳為芳香族聚酯，特佳為聚對苯二甲酸乙二酯。聚酯及較佳的聚對苯二甲酸乙二酯可為均聚物，但就抑制將薄膜進行單軸或雙軸延伸時之結晶化，並提高延伸製膜性之提升效果 之觀點而言，以共聚合聚酯及進而的共聚合聚對苯二甲酸乙二酯為較佳。作為如此般之共聚合成分，可舉例在反射層A之項中所述的二羧酸成分或二醇成分，但就所謂的耐熱性為高、延伸製膜性之提升效果為高之觀點而言，較佳為間苯二甲酸成分、2,6-萘二羧酸成分。共聚合成分之含有比例，以聚酯之全二羧酸成分100莫耳%作為基準，例如為1莫耳%以上，較佳為2莫耳%以上，更佳為3莫耳%以上，特佳為12莫耳%以上，又，例如為20莫耳%以下，較佳為18莫耳%以下，更佳為17莫耳%以下，特佳為16莫耳%以下。藉由將共聚合成分之比例設定為該範圍，延伸製膜性之提升效果為優異。又，熱尺寸安定性為優異。進而，可更提升熱撓曲之抑制效果。 As such a polyester, the same polyester as the polyester in the above-mentioned reflective layer A can be used. Among these polyesters, from the viewpoint of obtaining a white reflective film having excellent mechanical properties and thermal stability, an aromatic polyester is preferred, and polyethylene terephthalate is particularly preferred. The polyester and the preferred polyethylene terephthalate may be homopolymers, but inhibit the crystallization of the film during uniaxial or biaxial stretching, and improve the film forming property of the film. From the viewpoint of copolymerization, a copolymerized polyester and further copolymerized polyethylene terephthalate are preferred. The dicarboxylic acid component or the diol component described in the item of the reflective layer A can be exemplified as the above-mentioned copolymerization component, but the heat resistance is high and the effect of improving the film forming property is high. In other words, an isophthalic acid component and a 2,6-naphthalenedicarboxylic acid component are preferred. The content ratio of the copolymerization component is, for example, 1 mol% or more, preferably 2 mol% or more, more preferably 3 mol% or more, based on 100 mol% of the total dicarboxylic acid component of the polyester. The amount is preferably 12% by mole or more, and is, for example, 20% by mole or less, preferably 18% by mole or less, more preferably 17% by mole or less, and particularly preferably 16% by mole or less. By setting the ratio of the copolymerization component to this range, the effect of improving the film formability is excellent. Moreover, the thermal dimensional stability is excellent. Further, the effect of suppressing heat deflection can be further enhanced.

如此般之熱塑性樹脂B，融點較佳為190℃以上、280℃以下。藉此可更容易抑制熱撓曲。過低時，熱撓曲之抑制效果會有變低之傾向，過高時，操作會有變困難之傾向。就如此般之觀點而言，又較佳為195℃以上，更佳為200℃以上，又，又較佳為275℃以下，更佳為270℃以下。 In such a thermoplastic resin B, the melting point is preferably 190 ° C or more and 280 ° C or less. Thereby, heat deflection can be more easily suppressed. When the temperature is too low, the effect of suppressing heat deflection tends to be low, and when it is too high, the operation tends to be difficult. From such a viewpoint, it is preferably 195 ° C or higher, more preferably 200 ° C or higher, and further preferably 275 ° C or lower, more preferably 270 ° C or lower.

尚，作為構成本發明中的支撐層B的熱塑性樹脂B，可為較佳的熱塑性樹脂的聚酯、與和該聚酯為相異的其他的熱塑性樹脂之混合物。 Further, as the thermoplastic resin B constituting the support layer B in the present invention, a mixture of a polyester of a preferred thermoplastic resin and another thermoplastic resin different from the polyester may be used.

(其他的成分) (other ingredients)

在不妨礙本發明目的之範圍內，支撐層B係可由上述 熱塑性樹脂B中為含有任意成分的熱塑性樹脂組成物B所成者。作為如此般之任意成分，可舉例如紫外線吸收劑、抗氧化劑、抗靜電劑、螢光增白劑、蠟等。 The support layer B may be as described above within the scope not obstructing the object of the present invention. The thermoplastic resin B is a thermoplastic resin composition B containing an optional component. As such an arbitrary component, a ultraviolet absorber, an antioxidant, an antistatic agent, a fluorescent brightener, a wax, etc. are mentioned, for example.

又，在不妨礙本發明目的之範圍內，支撐層B可含有在反射層A所舉例的空孔形成劑來作為任意成分，藉由設定為如此般之樣態，可提高反射率之提升效果。相反地，減少支撐層B中的空孔形成劑之含量，或不含有空孔形成劑時，將可提高延伸製膜性之提升效果。就該等的之觀點而言，支撐層B中的空孔體積率(如此般之空孔體積率為支撐層B中的空孔之體積對支撐層B之體積之比例)較佳為0體積%以上、未滿15體積%，更佳為5體積%以下，特佳為3體積%以下。特別是由於本發明中可同時提高反射特性與延伸製膜性之提升效果，故以同時採用上述反射層A中的較佳空孔體積率、與如此般之支撐層B中的較佳空孔體積率為特佳。 Further, the support layer B may contain the pore-forming agent exemplified in the reflective layer A as an arbitrary component within a range not inhibiting the object of the present invention, and by setting such a state, the effect of improving the reflectance can be improved. . Conversely, when the content of the void former in the support layer B is reduced, or when the void former is not contained, the effect of improving the stretch film formation property can be improved. From the viewpoints of the above, the void volume ratio in the support layer B (so that the void volume ratio is the ratio of the volume of the voids in the support layer B to the volume of the support layer B) is preferably 0 volume. % or more, less than 15% by volume, more preferably 5% by volume or less, particularly preferably 3% by volume or less. In particular, since the effect of improving the reflective property and the extended film forming property can be simultaneously improved in the present invention, the preferred void volume ratio in the reflective layer A and the preferred void in the support layer B are used at the same time. The volume ratio is particularly good.

[表面層C] [Surface layer C]

本發明的白色反射薄膜可於薄膜之至少一側之表面具有表面層C，該表面層C係由含有表面層粒子之熱塑性樹脂組成物C所成者。藉由如此般之表面層C，可賦予反射光擴散性，或與導光板接觸時可確保與導光板之間隙，或可賦予抑制導光板之受傷之機能。為了發揮如此般的效果，表面層C在薄膜中係在反射面側，在背光模組中係在光源側或導光板側。又，為了發揮如此般的效果，如此般 之表面層粒子之平均粒徑為2.0μm以上、50.0μm以下，又，含量對熱塑性樹脂組成物C之體積為3體積%以上、50體積%以下。 The white reflective film of the present invention may have a surface layer C on the surface of at least one side of the film, and the surface layer C is composed of a thermoplastic resin composition C containing surface layer particles. By such a surface layer C, diffused light can be imparted, or a gap with the light guide plate can be ensured when it comes into contact with the light guide plate, or the function of suppressing the damage of the light guide plate can be imparted. In order to exert such an effect, the surface layer C is on the side of the reflection surface in the film, and is on the side of the light source or the side of the light guide plate in the backlight module. Also, in order to achieve such an effect, so The average particle diameter of the surface layer particles is 2.0 μm or more and 50.0 μm or less, and the content of the thermoplastic resin composition C is 3% by volume or more and 50% by volume or less.

又，為了發揮上述效果，在表面層C之表面且與反射層A為相反側之表面較佳藉由上述表面層粒子來形成突起，作為如此般之表面之樣態，以中心線平均粗糙度Ra計算時較佳為0.1μm以上、6.0μm以下之範圍，以十點平均粗糙度Rz計算時較佳為3.0μm以上、40.0μm以下之範圍。如此般之Ra與Rz，以位於雙方之如此般之範圍內為較佳。 Further, in order to exhibit the above effects, it is preferable that the surface of the surface layer C and the surface opposite to the reflective layer A are formed by the surface layer particles, and as a surface of such a surface, the center line average roughness is obtained. The Ra calculation is preferably in the range of 0.1 μm or more and 6.0 μm or less, and in the case of the ten-point average roughness Rz, it is preferably in the range of 3.0 μm or more and 40.0 μm or less. Such Ra and Rz are better in such a range as the two sides.

以下，對於本發明中的表面層C進行詳述。 Hereinafter, the surface layer C in the present invention will be described in detail.

(熱塑性樹脂C) (thermoplastic resin C)

作為構成本發明中的表面層C的熱塑性樹脂C，可使用與上述構成反射層A的熱塑性樹脂A為相同的熱塑性樹脂。其中，就得到機械特性及熱安定性為優異的白色反射薄膜之觀點而言，較佳為聚酯。 As the thermoplastic resin C constituting the surface layer C in the present invention, the same thermoplastic resin as the thermoplastic resin A constituting the reflective layer A described above can be used. Among them, from the viewpoint of obtaining a white reflective film excellent in mechanical properties and thermal stability, polyester is preferred.

作為如此般之聚酯，可使用與上述反射層A中的聚酯為相同的聚酯。該等的聚酯之中，就得到機械特性及熱安定性為優異的白色反射薄膜之觀點而言，較佳為芳香族聚酯，特佳為聚對苯二甲酸乙二酯。聚酯及較佳的聚對苯二甲酸乙二酯可為均聚物，但就抑制將薄膜進行單軸或雙軸延伸時之結晶化，並提高延伸製膜性之提升效果之觀點而言，以共聚合聚酯及進而的共聚合聚對苯二甲酸 乙二酯為較佳。作為如此般之共聚合成分，可舉例在反射層A之項中所述的二羧酸成分或二醇成分，但就所謂的耐熱性為高、延伸製膜性之提升效果為高之觀點而言，較佳為間苯二甲酸成分、2,6-萘二羧酸成分。共聚合成分之含有比例，以聚酯之全二羧酸成分100莫耳%作為基準，例如為1莫耳%以上，較佳為2莫耳%以上，更佳為3莫耳%以上，特佳為12莫耳%以上，又，例如為20莫耳%以下，較佳為18莫耳%以下，更佳為17莫耳%以下，特佳為16莫耳%以下。藉由將共聚合成分之比例設定為該範圍，延伸製膜性之提升效果為優異。又，熱尺寸安定性為優異。進而，可更提升熱撓曲之抑制效果。 As such a polyester, the same polyester as the polyester in the above-mentioned reflective layer A can be used. Among these polyesters, from the viewpoint of obtaining a white reflective film having excellent mechanical properties and thermal stability, an aromatic polyester is preferred, and polyethylene terephthalate is particularly preferred. The polyester and the preferred polyethylene terephthalate may be a homopolymer, but the viewpoint of suppressing the crystallization of the film during uniaxial or biaxial stretching and improving the film forming property of the film is improved. To copolymerize polyester and further copolymerized polyterephthalic acid Ethylene glycol is preferred. The dicarboxylic acid component or the diol component described in the item of the reflective layer A can be exemplified as the above-mentioned copolymerization component, but the heat resistance is high and the effect of improving the film forming property is high. In other words, an isophthalic acid component and a 2,6-naphthalenedicarboxylic acid component are preferred. The content ratio of the copolymerization component is, for example, 1 mol% or more, preferably 2 mol% or more, more preferably 3 mol% or more, based on 100 mol% of the total dicarboxylic acid component of the polyester. The amount is preferably 12% by mole or more, and is, for example, 20% by mole or less, preferably 18% by mole or less, more preferably 17% by mole or less, and particularly preferably 16% by mole or less. By setting the ratio of the copolymerization component to this range, the effect of improving the film formability is excellent. Moreover, the thermal dimensional stability is excellent. Further, the effect of suppressing heat deflection can be further enhanced.

如此般之熱塑性樹脂C，融點較佳為225℃以上、260℃以下。藉此可更容易抑制熱撓曲。過低時，熱撓曲之抑制效果會有變低之傾向，過高時，操作會有變困難之傾向。就如此般之觀點而言，又較佳為230℃以上，更佳為235℃以上，又，又較佳為258℃以下，更佳為256℃以下。 In such a thermoplastic resin C, the melting point is preferably 225 ° C or higher and 260 ° C or lower. Thereby, heat deflection can be more easily suppressed. When the temperature is too low, the effect of suppressing heat deflection tends to be low, and when it is too high, the operation tends to be difficult. From such a viewpoint, it is preferably 230 ° C or more, more preferably 235 ° C or more, and still more preferably 258 ° C or less, more preferably 256 ° C or less.

尚，作為構成本發明中的表面層C的熱塑性樹脂C，可為較佳的熱塑性樹脂的聚酯、與和該聚酯為相異的其他的熱塑性樹脂之混合物。 Further, as the thermoplastic resin C constituting the surface layer C in the present invention, a mixture of a polyester of a preferred thermoplastic resin and another thermoplastic resin different from the polyester may be used.

(表面層粒子) (surface layer particles)

本發明中，藉由具有表面層C，可賦予反射光擴散性。又，在與導光板接觸使用之際，可賦予確保與導光板 之間隙、或抑制導光板之受傷之效果。 In the present invention, by having the surface layer C, diffusible light can be imparted. Moreover, when used in contact with the light guide plate, it can be provided with the light guide plate The gap or the effect of suppressing the damage of the light guide plate.

首先，對於賦予反射光擴散性之情形時為較佳的表面層粒子之樣態進行說明。本樣態適合於直下型背光模組，特別是適合於具有具備鏡頭蓋的光源(作為如此般之光源較佳為LED光源)的直下型背光模組。 First, a description will be given of a state in which a surface layer particle is preferable in the case where diffused light is diffused. The present mode is suitable for a direct type backlight module, and is particularly suitable for a direct type backlight module having a light source having a lens cover (as such a light source is preferably an LED light source).

在如此之情形中，為了更良好地發揮上述效果，表面層C之外側表面之Ra較佳為0.1μm以上，又較佳為0.2μm以上，又，較佳為3.0μm以下，又較佳為2.7μm以下。Rz較佳為3.0μm以上，又較佳為4.0μm以上，又，較佳為15.0μm以下，又較佳為13.0μm以下。尚，如此般之表面之樣態可參考後述的表面層粒子之平均粒徑或含量予以適當調整來達成。 In such a case, in order to exert the above effects more satisfactorily, Ra of the outer surface of the surface layer C is preferably 0.1 μm or more, more preferably 0.2 μm or more, further preferably 3.0 μm or less, and more preferably 2.7 μm or less. Rz is preferably 3.0 μm or more, more preferably 4.0 μm or more, further preferably 15.0 μm or less, and still more preferably 13.0 μm or less. Further, the appearance of such a surface can be achieved by appropriately adjusting the average particle diameter or content of the surface layer particles described later.

此時，作為使用於表面層C的表面層粒子，平均粒徑較佳為2.0μm以上、40.0μm以下。藉由設定為如此般的樣態，可容易提升反射光之擴散性。平均粒徑若過小時，會有難以形成突起之傾向，而反射光之擴散性有變小之傾向。就如此般之觀點而言，表面層粒子之平均粒徑又較佳為2.5μm以上，更佳為3.0μm以上，又更佳為3.5μm以上，特佳為4.0μm以上。另一方面，所使用的表面層粒子若過大時，在生產薄膜之際會有容易使濾器等堵塞之傾向，又，表面層粒子會有容易自表面層C脫落之傾向。就如此般之觀點而言，又較佳為35.0μm以下，更佳為30.0μm以下，又更佳為25.0μm以下，特佳為20.0μm以下。 In this case, as the surface layer particles used for the surface layer C, the average particle diameter is preferably 2.0 μm or more and 40.0 μm or less. By setting such a state, the diffusibility of the reflected light can be easily improved. If the average particle diameter is too small, the protrusion tends to be difficult to form, and the diffusibility of the reflected light tends to be small. From such a viewpoint, the average particle diameter of the surface layer particles is preferably 2.5 μm or more, more preferably 3.0 μm or more, still more preferably 3.5 μm or more, and particularly preferably 4.0 μm or more. On the other hand, when the surface layer particles to be used are too large, the filter tends to be clogged at the time of film production, and the surface layer particles tend to fall off from the surface layer C. From such a viewpoint, it is preferably 35.0 μm or less, more preferably 30.0 μm or less, still more preferably 25.0 μm or less, and particularly preferably 20.0 μm or less.

又，為了更容易發揮表面層C的上述機能，表面層C的表面層粒子之含量，以表面層C(此即可為構成表面層C的熱塑性樹脂組成物C)之體積作為基準，較佳為3體積%以上、50體積%以下。含量若過少時，反射光之擴散性會有變小之傾向。另一方面，過多時，會有容易產生濾器之堵塞之傾向，又，表面層粒子會有容易脫落之傾向。就如此般之觀點而言，含量又較佳為5體積%以上，更佳為6體積%以上，特佳為10體積%以上，又，又較佳為45體積%以下，更佳為40體積%以下，更佳為35體積%以下，特佳為30體積%以下。 Moreover, in order to more easily exhibit the above-described function of the surface layer C, the content of the surface layer particles of the surface layer C is preferably based on the volume of the surface layer C (which may be the thermoplastic resin composition C constituting the surface layer C). It is 3 vol% or more and 50 vol% or less. If the content is too small, the diffusibility of the reflected light tends to be small. On the other hand, when it is too much, the clogging of a filter tends to occur, and the surface layer particle tends to fall easily. From such a viewpoint, the content is preferably 5% by volume or more, more preferably 6% by volume or more, particularly preferably 10% by volume or more, and further preferably 45% by volume or less, more preferably 40% by volume. % or less, more preferably 35% by volume or less, and particularly preferably 30% by volume or less.

本發明中，使用於表面層C的表面層粒子，不論其種類皆可，可為有機粒子、無機粒子、或有機無機複合粒子。更具體而言對於特佳的樣態進行說明時，作為較佳的有機粒子，可舉例如聚四氟乙烯般的含氟樹脂粒子、高耐熱尼龍粒子、高耐熱丙烯酸粒子等。又，作為較佳的無機粒子，可舉例氧化鈦粒子、硫酸鋇、碳酸鈣、氧化鋅粒子、氧化鋯粒子、氧化鋁粒子、矽石粒子等。 In the present invention, the surface layer particles used in the surface layer C may be organic particles, inorganic particles, or organic-inorganic composite particles, regardless of the type thereof. More specifically, when a preferred embodiment is described, preferred examples of the organic particles include fluorine-containing resin particles such as polytetrafluoroethylene, high heat-resistant nylon particles, and highly heat-resistant acrylic particles. Further, examples of preferred inorganic particles include titanium oxide particles, barium sulfate, calcium carbonate, zinc oxide particles, zirconium oxide particles, alumina particles, and vermiculite particles.

其中，較佳為凝集粒子，更佳為凝集無機粒子，特佳為凝集矽石粒子。藉由採用如此般較佳的表面層粒子，可使成為較佳的擴散性。此係本發明中為藉由採用凝集粒子來作為表面層C之表面層粒子，由於亦可期望凝集粒子中的光之擴散，而認為可更提升反射光之擴散性，故為較佳。又，藉由採用凝集粒子亦具有下述般之效果：可更抑制製膜延伸時之破斷不良、或抑制利用自我回收原 料來生產薄膜時之破斷不良或對於光學特性之影響。 Among them, agglomerated particles are preferred, and inorganic particles are more preferably aggregated, particularly preferably agglomerated vermiculite particles. By using such a preferable surface layer particle, it is possible to achieve better diffusibility. In the present invention, by using aggregated particles as the surface layer particles of the surface layer C, it is preferable that the diffusion of light in the aggregated particles is desired, and it is considered that the diffusibility of the reflected light can be further enhanced. Moreover, the use of aggregated particles also has the following effects: it can further suppress the breakage during film formation extension, or suppress the use of self-recovery. The material is poorly broken or has an effect on optical properties.

又，上述的無機粒子及高耐熱尼龍粒子、高耐熱丙烯酸粒子亦具有所謂的，即使是加熱加工亦不易造成熔融或氣體之產生之效果。進而，就所謂的表面層C之形成之際不易產生粒度分布或形狀之變化之觀點而言，亦為較佳。 Moreover, the above-mentioned inorganic particles, high heat resistant nylon particles, and high heat resistant acrylic particles also have a so-called effect of causing generation of melting or gas even by heat processing. Further, it is also preferable from the viewpoint that the formation of the surface layer C is less likely to cause a change in particle size distribution or shape.

接著，對於賦予確保與導光板之間隙、抑制導光板之受傷之機能之情形時為較佳的表面層粒子之樣態進行說明。本樣態特別適合於具備導光板的側光型背光模組。 Next, a description will be given of a state in which a surface layer particle is preferable in the case where a function of securing a gap with the light guide plate and suppressing the damage of the light guide plate is provided. This aspect is particularly suitable for an edge-light type backlight module having a light guide plate.

在如此之情形中，為了更良好地發揮上述效果，表面層C之外側表面之Ra較佳為1.0μm以上，又較佳為1.5μm以上，又，較佳為6.0μm以下，又較佳為5.5μm以下。Rz較佳為6.0μm以上，又較佳為6.5μm以上，又，較佳為40.0μm以下，又較佳為35.0μm以下。尚，如此般之表面之樣態可參考後述的表面層粒子之平均粒徑或含量予以適當調整來達成。 In such a case, in order to exhibit the above effects more satisfactorily, Ra of the outer surface of the surface layer C is preferably 1.0 μm or more, more preferably 1.5 μm or more, further preferably 6.0 μm or less, and more preferably 5.5 μm or less. Rz is preferably 6.0 μm or more, more preferably 6.5 μm or more, further preferably 40.0 μm or less, and more preferably 35.0 μm or less. Further, the appearance of such a surface can be achieved by appropriately adjusting the average particle diameter or content of the surface layer particles described later.

此時，作為使用於表面層C的表面層粒子，平均粒徑較佳為3.0μm以上、50.0μm以下。藉由設定為如此般的樣態，可容易確保與導光板之間隙及抑制導光板之受傷。平均粒徑若過小時，會有難以形成突起之傾向，而會有難以確保與導光板之間隙之傾向。又，會有容易使導光板受傷之傾向。就如此般之觀點而言，表面層粒子之平均粒徑又較佳為3.5μm以上，更佳為4.0μm以上，又更 佳為4.5μm以上，特佳為5.0μm以上。另一方面，所使用的表面層粒子若過大時，在生產薄膜之際會有容易使濾器堵塞之傾向，又，容易會有表面層粒子之脫落或因此所造成的導光板受傷之傾向。就如此般之觀點而言，又較佳為48.0μm以下，更佳為46.0μm以下，更佳為44.0μm以下，特佳為42.0μm以下。 In this case, the average particle diameter of the surface layer particles used for the surface layer C is preferably 3.0 μm or more and 50.0 μm or less. By setting such a state, it is possible to easily ensure a gap with the light guide plate and suppress the damage of the light guide plate. If the average particle diameter is too small, the protrusion tends to be difficult to form, and there is a tendency that it is difficult to secure a gap with the light guide plate. Moreover, there is a tendency that the light guide plate is easily injured. From such a viewpoint, the average particle diameter of the surface layer particles is preferably 3.5 μm or more, more preferably 4.0 μm or more, and still more. It is preferably 4.5 μm or more, and particularly preferably 5.0 μm or more. On the other hand, when the surface layer particles to be used are too large, the filter tends to be clogged when the film is produced, and the surface layer particles are likely to fall off or the light guide plate is likely to be injured. From such a viewpoint, it is preferably 48.0 μm or less, more preferably 46.0 μm or less, still more preferably 44.0 μm or less, and particularly preferably 42.0 μm or less.

又，為了更容易滿足表面層C表面的上述表面之樣態，表面層C的表面層粒子之含量，以表面層C(此即可為構成表面層C的熱塑性樹脂組成物C)之體積作為基準，較佳為3體積%以上、50體積%以下。含量若過少時，會有難以確保與導光板之間隙或抑制導光板之受傷之傾向。另一方面，過多時，會有容易產生濾器之堵塞之傾向，又，表面層粒子會有容易脫落之傾向。就如此般之觀點而言，含量又較佳為5體積%以上，更佳為6體積%以上，特佳為10體積%以上，又，又較佳為45體積%以下，更佳為40體積%以下，更佳為35體積%以下，特佳為30體積%以下。 Further, in order to more easily satisfy the above-described state of the surface of the surface layer C, the content of the surface layer particles of the surface layer C is determined by the volume of the surface layer C (this may be the thermoplastic resin composition C constituting the surface layer C). The basis is preferably 3% by volume or more and 50% by volume or less. If the content is too small, it may be difficult to secure a gap with the light guide plate or to suppress the damage of the light guide plate. On the other hand, when it is too much, the clogging of a filter tends to occur, and the surface layer particle tends to fall easily. From such a viewpoint, the content is preferably 5% by volume or more, more preferably 6% by volume or more, particularly preferably 10% by volume or more, and further preferably 45% by volume or less, more preferably 40% by volume. % or less, more preferably 35% by volume or less, and particularly preferably 30% by volume or less.

本發明中，使用於表面層C的表面層粒子，不論其種類皆可，可為有機粒子、無機粒子、或有機無機複合粒子。更具體而言對於特佳的樣態進行說明時，作為較佳的有機粒子，可舉例如聚四氟乙烯般的含氟樹脂粒子、高耐熱尼龍粒子、高耐熱丙烯酸粒子等。又，作為較佳的無機粒子，較佳為凝集無機粒子。作為該凝集無機粒子，可舉例凝集氧化鈦粒子、凝集硫酸鋇粒子、凝集碳酸 鈣粒子、凝集氧化鋅粒子、凝集氧化鋯粒子、凝集氧化鋁粒子、凝集矽石粒子等。其中，較佳為凝集矽石粒子。 In the present invention, the surface layer particles used in the surface layer C may be organic particles, inorganic particles, or organic-inorganic composite particles, regardless of the type thereof. More specifically, when a preferred embodiment is described, preferred examples of the organic particles include fluorine-containing resin particles such as polytetrafluoroethylene, high heat-resistant nylon particles, and highly heat-resistant acrylic particles. Further, as the preferred inorganic particles, the inorganic particles are preferably aggregated. As the aggregated inorganic particles, agglomerated titanium oxide particles, aggregated barium sulfate particles, and aggregated carbonic acid can be exemplified. Calcium particles, agglomerated zinc oxide particles, agglomerated zirconia particles, aggregated alumina particles, aggregated vermiculite particles, and the like. Among them, agglomerated vermiculite particles are preferred.

藉由採用如此般較佳的表面層粒子，確保與導光板之間隙及抑制導光板之受傷之效果為更優異。此係本發明中為藉由採用凝集粒子來作為無機粒子，表面層粒子為具有適度的柔軟性，而認為可確保與導光板之間隙之同時更提升抑制導光板之受傷之效果，故為較佳。又，藉由採用凝集粒子亦具有下述般之效果：可更抑制製膜延伸時之破斷不良、或抑制利用自我回收原料來生產薄膜時之破斷不良或對於光學特性之影響。 By using such a preferable surface layer particle, the effect of ensuring a gap with the light guide plate and suppressing the damage of the light guide plate is more excellent. In the present invention, by using aggregated particles as the inorganic particles, the surface layer particles have moderate flexibility, and it is considered that the gap with the light guide plate can be ensured while the effect of suppressing the damage of the light guide plate is enhanced, so good. Moreover, the use of the aggregated particles has an effect of suppressing the breakage at the time of film formation extension or suppressing the breakage or the influence on the optical characteristics when the film is produced by self-recovering the raw material.

又，上述的無機粒子及高耐熱尼龍粒子、高耐熱丙烯酸粒子亦具有所謂的，即使是加熱加工亦不易造成熔融或氣體之產生之效果。進而，就所謂的表面層C之形成之際不易產生粒度分布或形狀之變化之觀點而言，亦為較佳。 Moreover, the above-mentioned inorganic particles, high heat resistant nylon particles, and high heat resistant acrylic particles also have a so-called effect of causing generation of melting or gas even by heat processing. Further, it is also preferable from the viewpoint that the formation of the surface layer C is less likely to cause a change in particle size distribution or shape.

(其他的成分) (other ingredients)

在不妨礙本發明目的之範圍內，表面層C係可由上述熱塑性樹脂C中為含有任意成分的熱塑性樹脂組成物C所成者。作為如此般之任意成分，可舉例如紫外線吸收劑、抗氧化劑、抗靜電劑、螢光增白劑、蠟等。 The surface layer C may be formed of the thermoplastic resin composition C containing an optional component in the thermoplastic resin C as long as the object of the present invention is not impaired. As such an arbitrary component, a ultraviolet absorber, an antioxidant, an antistatic agent, a fluorescent brightener, a wax, etc. are mentioned, for example.

又，在不妨礙本發明目的之範圍內，表面層C可含有在反射層A所舉例的空孔形成劑來作為任意成分，藉由設定為如此般之樣態，可提高反射率之提升效 果。相反地，減少表面層C中的空孔形成劑之含量，或不含有空孔形成劑時，將可提高延伸製膜性之提升效果。就該等的之觀點而言，表面層C中的空孔體積率(如此般之空孔體積率為表面層C中的空孔之體積對表面層C之體積之比例)較佳為0體積%以上、未滿15體積%，更佳為5體積%以下，特佳為3體積%以下。特別是由於本發明中可同時提高反射特性與延伸製膜性之提升效果，故以同時採用上述反射層A中的較佳空孔體積率、與如此般之表面層C中的較佳空孔體積率為特佳。 Further, the surface layer C may contain a pore-forming agent exemplified in the reflective layer A as an arbitrary component within a range not inhibiting the object of the present invention, and by setting such a state, the reflectance can be improved. fruit. Conversely, when the content of the void former in the surface layer C is reduced, or when the void former is not contained, the effect of improving the stretch film forming property can be improved. From the viewpoints of the above, the void volume ratio in the surface layer C (so that the void volume ratio is the ratio of the volume of the voids in the surface layer C to the volume of the surface layer C) is preferably 0 volume. % or more, less than 15% by volume, more preferably 5% by volume or less, particularly preferably 3% by volume or less. In particular, since the effect of improving the reflective property and the extended film forming property can be simultaneously improved in the present invention, the preferred void volume ratio in the reflective layer A and the preferred void in the surface layer C are used at the same time. The volume ratio is particularly good.

[層構成] [layer composition]

本發明中的白色反射薄膜之厚度較佳為155μm以上、350μm以下。在此，若白色反射薄膜僅由反射層A所成時，如此般之厚度為反射層A之厚度。藉此可提高反射率之提升效果。又，可提高熱撓曲抑制之提升效果。過薄時，反射率之提升效果會變低，又，熱撓曲抑制之提升效果會變低，另一方面，過厚時，非有效率的。就如此般之觀點而言，又較佳為160μm以上，更佳為170μm以上，特佳為180μm以上，又，又較佳為340μm以下，更佳為330μm以下，特佳為320μm以下。 The thickness of the white reflective film in the present invention is preferably 155 μm or more and 350 μm or less. Here, if the white reflective film is formed only by the reflective layer A, the thickness is the thickness of the reflective layer A. Thereby, the effect of improving the reflectance can be improved. Moreover, the effect of improving the thermal deflection suppression can be improved. When it is too thin, the effect of improving the reflectance will be low, and the effect of suppressing the heat deflection will be low. On the other hand, when it is too thick, it is not efficient. From such a viewpoint, it is preferably 160 μm or more, more preferably 170 μm or more, particularly preferably 180 μm or more, further preferably 340 μm or less, more preferably 330 μm or less, and particularly preferably 320 μm or less.

將白色反射薄膜全體之厚度設為100%時反射層A之厚度比率，只要較佳為50%以上即可，又較佳為60%以上，更佳為70%以上，又，又較佳為95%以下，更佳為90%以下。在此，若反射層A為具有複數時，如此般 之厚度比率為合計厚度之比率。又，具有支撐層B時，該厚度比率較佳為5%以上，又較佳為10%以上，又，較佳為50%以下，又較佳為40%以下，更佳為30%以下。在此，若支撐層B為具有複數時，如此般之厚度比率為合計厚度之比率。藉此可使反射特性或延伸製膜性等的各特性之均衡更為良好。又，可使該等的均衡更為良好之同時更提高熱撓曲抑制之提升效果。 When the thickness of the entire white reflective film is 100%, the thickness ratio of the reflective layer A is preferably 50% or more, more preferably 60% or more, still more preferably 70% or more, and further preferably 95% or less, more preferably 90% or less. Here, if the reflective layer A has a complex number, The thickness ratio is the ratio of the total thickness. Further, when the support layer B is provided, the thickness ratio is preferably 5% or more, more preferably 10% or more, still more preferably 50% or less, still more preferably 40% or less, still more preferably 30% or less. Here, when the support layer B has a complex number, the thickness ratio is such a ratio of the total thickness. Thereby, the balance of each characteristic such as a reflection characteristic or an extension film forming property can be made better. Moreover, the equalization of the equalization can be made better and the improvement effect of the thermal deflection suppression can be further improved.

本發明中的支撐層B之厚度較佳為2μm以上、80μm以下。在此，薄膜中若具有複數的支撐層B時，如此般之厚度為合計厚度。藉此可提高延伸製膜性之提升效果，又，可提高熱撓曲之抑制效果。進而可降低熱收縮。支撐層B若過薄時，延伸製膜性之提升效果會有變低之傾向。又，熱撓曲之抑制效果會有變低之傾向。另一方面，即使是過厚上述效果亦未有太大之改變，非有效率的。就該等之觀點而言，支撐層B之厚度(合計厚度)又較佳為5μm以上，更佳為10μm以上，又，又較佳為70μm以下，更佳為65μm以下。 The thickness of the support layer B in the present invention is preferably 2 μm or more and 80 μm or less. Here, when a plurality of support layers B are provided in the film, the thickness is such a total thickness. Thereby, the effect of improving the film forming property can be improved, and the effect of suppressing heat deflection can be improved. In turn, heat shrinkage can be reduced. When the support layer B is too thin, the effect of improving the film formability tends to be low. Further, the effect of suppressing heat deflection tends to be low. On the other hand, even if the thickness is too thick, the above effects are not changed much, and are not efficient. From the viewpoints of the above, the thickness (total thickness) of the support layer B is preferably 5 μm or more, more preferably 10 μm or more, still more preferably 70 μm or less, and still more preferably 65 μm or less.

又，在反射層A之反射面側若具有支撐層B時，該支撐層B之厚度會影響反射率。即，反射層A之反射面側之支撐層B之厚度過厚時，反射率之提升效果會有變低之傾向。另一方面，過薄時，抑制反射層A之碳酸鈣粒子脫落之效果、或抑制因反射層A之碳酸鈣所造成的裝置或其他構件之受傷之效果會有變低之傾向。就該等之觀點而言，支撐層B之厚度較佳為1μm以上、40μm以 下，又較佳為2.5μm以上，更佳為5μm以上，又，又較佳為35μm以下，更佳為32.5μm以下。在此，如此般之厚度為支撐層B之1層之厚度。 Further, when the support layer B is provided on the side of the reflection surface of the reflection layer A, the thickness of the support layer B affects the reflectance. In other words, when the thickness of the support layer B on the reflecting surface side of the reflective layer A is too thick, the effect of improving the reflectance tends to be low. On the other hand, when it is too thin, the effect of suppressing the detachment of the calcium carbonate particles of the reflective layer A or the effect of suppressing the injury of the device or other members due to the calcium carbonate of the reflective layer A tends to be low. From the viewpoints of the above, the thickness of the support layer B is preferably 1 μm or more and 40 μm. Further, it is preferably 2.5 μm or more, more preferably 5 μm or more, still more preferably 35 μm or less, and still more preferably 32.5 μm or less. Here, the thickness is such a thickness as one layer of the support layer B.

白色反射薄膜若具有反射層A與支撐層B時，將該層積構成以反射層A表示為A、支撐層B表示為B時，可舉例B/A之2層構成、A/B/A或B/A/B之3層構成、B/A/B/A或B/A/B’/A之4層構成、又具有相同的A與B為5層以上之多層構成。尚，上述中的B’為表示與支撐層B為相同之構成的其他構成的支撐層B’。特佳為B/A之2層構成、A/B/A、B/A/B之3層構成。最佳為B/A/B之3層構成，延伸製膜性為更優異。又，表背面的支撐層B之厚度範圍越近時，越難產生捲曲等的問題。 When the white reflective film has the reflective layer A and the support layer B, the laminated structure is represented by the reflective layer A and the support layer B is represented by B. The two-layer structure of B/A can be exemplified, A/B/A. Or a three-layer structure of B/A/B, a four-layer structure of B/A/B/A or B/A/B'/A, and the same A and B layers of five or more layers. Further, B' in the above is a support layer B' showing another configuration having the same configuration as that of the support layer B. It is particularly preferably composed of a two-layer structure of B/A and three layers of A/B/A and B/A/B. It is preferably composed of three layers of B/A/B, and the film forming property is more excellent. Further, the closer the thickness range of the support layer B on the back surface of the front surface is, the more difficult it is to cause curling or the like.

本發明中，除了反射層A與支撐層B以外，在不損及本發明目的之範圍內亦可具有其他之層。例如亦可具有用來賦予抗靜電性或導電性、紫外線耐久性等的機能之層。如此般之層較佳為塗佈層。又，為了賦予反射光擴散性，或為了確保與導光板之間隙，亦可在反射面側之至少單面之最表面具有含有珠粒之珠粒層。尚，表面層C為珠粒層之較佳一樣態。 In the present invention, in addition to the reflective layer A and the support layer B, other layers may be provided without departing from the object of the present invention. For example, it may have a layer for imparting functions such as antistatic property, electrical conductivity, ultraviolet durability, and the like. Such a layer is preferably a coating layer. Further, in order to impart diffused light diffusedness or to secure a gap with the light guide plate, a bead layer containing beads may be provided on the outermost surface of at least one side of the reflecting surface side. Further, the surface layer C is a preferred state of the bead layer.

若具有表面層C時，本發明中的表面層C之厚度較佳為5μm以上、70μm以下。在此，薄膜中若具有複數的表面層C時，如此般之厚度為在光源側或導光板側之1層之厚度。藉此可更容易發揮表面層C之上述之效果。過薄時，容易產生表面層粒子之脫落，另一方面，過 厚時，有難以形成突起之傾向，而有難以發揮上述之效果之傾向。又經濟性為非有效率的。就如此般之觀點而言，更佳為10μm以上，又，60μm以下。 When the surface layer C is provided, the thickness of the surface layer C in the present invention is preferably 5 μm or more and 70 μm or less. Here, when the film has a plurality of surface layers C, the thickness is such a thickness as one layer on the light source side or the light guide plate side. Thereby, the above effect of the surface layer C can be more easily exerted. When it is too thin, it is easy to cause the surface layer particles to fall off. On the other hand, When it is thick, there is a tendency that it is difficult to form a protrusion, and it is difficult to exhibit the above-described effects. And economics are not efficient. From such a viewpoint, it is more preferably 10 μm or more and 60 μm or less.

白色反射薄膜若具有反射層A與表面層C時，該層積構成以反射層A表示為A、表面層C表示為C時，可舉例C/A之2層構成、C/A/C之3層構成、C/A/C/A或C/A/C’/A之4層構成、又具有相同的A與C為5層以上之多層構成。尚，上述中不未於表面之C，係表示與表面層C為相同構成的內面層C。又C’為表示與表面層C為相同之構成的其他構成的表面層C’。特佳為C/A之2層構成、C/A/C之3層構成。最佳為C/A/C之3層構成，延伸製膜性為更優異。又，表背面之表面層C之厚度範圍越近時，越難產生捲曲等的問題。 When the white reflective film has the reflective layer A and the surface layer C, the laminated structure is represented by a reflective layer A and A, and the surface layer C is represented by C. The two-layer structure of C/A can be exemplified, C/A/C. The three-layer structure, the C/A/C/A or C/A/C'/A four-layer structure, and the same A and C are five or more layers. In addition, the above-mentioned C which is not on the surface is the inner surface layer C which has the same structure as the surface layer C. Further, C' is a surface layer C' showing another configuration having the same configuration as that of the surface layer C. It is preferably composed of a two-layer structure of C/A and a three-layer structure of C/A/C. It is preferably composed of three layers of C/A/C, and the film forming property is more excellent. Further, the closer the thickness range of the surface layer C on the front and back surfaces is, the more difficult it is to cause curling or the like.

又，白色反射薄膜若具有反射層A、支撐層B及表面層C時，該層積構成以支撐層B表示為B時，可舉例C/B/A或C/A/B之3層構成、C/A/B/A或C/B/A/B之4層構成、C/B/A/B/A或C/B/A/B’/A之5層構成、又在具有相同的A與B為6層以上之多層構成之至少單面之表面具有表面層C之多層構成。尚，上述中B’為表示與支撐層B為相同之構成的其他構成的支撐層B’。特佳為C/B/A、C/A/B之3層構成、C/A/B/A、C/B/A/B之4層構成。最佳為C/B/A/B之4層構成，延伸製膜性為更優異。又，表背面的支撐層B之厚度範圍越近時，越難產生捲曲等的問題。 Further, when the white reflective film has the reflective layer A, the support layer B, and the surface layer C, the laminated structure is represented by the support layer B as B, and a three-layer structure of C/B/A or C/A/B can be exemplified. , 4 layers of C/A/B/A or C/B/A/B, 5 layers of C/B/A/B/A or C/B/A/B'/A, and have the same A and B are a multilayer structure in which at least one surface of a plurality of layers of six or more layers has a surface layer C. In the above, B' is a support layer B' having another configuration which is the same as the support layer B. It is preferably composed of three layers of C/B/A and C/A/B, and four layers of C/A/B/A and C/B/A/B. It is preferably composed of four layers of C/B/A/B, and the film forming property is more excellent. Further, the closer the thickness range of the support layer B on the back surface of the front surface is, the more difficult it is to cause curling or the like.

[薄膜之製造方法] [Manufacturing method of film]

以下說明製造本發明的白色反射薄膜之方法之一例。 An example of a method of producing the white reflective film of the present invention will be described below.

在製造本發明的白色反射薄膜時，反射層A較佳藉由熔融擠壓法來形成。又，白色反射薄膜若為反射層A與支撐層B之層積構成之情形、或反射層A與表面層C之層積構成之情形、或反射層A與支撐層B與表面層C之層積構成之情形時，該等各層較佳藉由共擠壓法來層積並製造。藉此可提高延伸製膜性之提升效果。又，反射層A與支撐層B、或反射層A與表面層C、或反射層A與支撐層B與表面層C，以藉由共擠壓法來直接層積為較佳。如此般藉由共擠壓法來進行層積，可提高各層之界面密著性，此外亦無需經過用來貼合薄膜、或薄膜之製膜後再形成支撐層B或表面層C之步驟，故可廉價、容易地進行量產。 In the production of the white reflective film of the present invention, the reflective layer A is preferably formed by melt extrusion. Further, the white reflective film is composed of a laminate of the reflective layer A and the support layer B, or a laminate of the reflective layer A and the surface layer C, or a layer of the reflective layer A and the support layer B and the surface layer C. In the case of a product composition, the layers are preferably laminated and fabricated by a co-extrusion process. Thereby, the effect of improving the film forming property can be improved. Further, it is preferable that the reflective layer A and the support layer B, or the reflective layer A and the surface layer C, or the reflective layer A and the support layer B and the surface layer C are directly laminated by a co-extrusion method. By laminating by the co-extrusion method, the interfacial adhesion of the layers can be improved, and the step of forming the support layer B or the surface layer C after laminating the film or the film is not required. Therefore, mass production can be performed inexpensively and easily.

以下對於本發明的白色反射薄膜之更具體製法之一例進行說明，但本發明並不限定於如此般之製法，又，亦可參考下述內容來對於其他之樣態進行相同之製造。此時，若不包含擠壓步驟時，以下的「熔融擠壓溫度」只要解讀為例如「熔融溫度」即可。尚，在此所使用的聚酯之融點設為Tm(單位：℃)、玻璃轉移溫度設為Tg(單位：℃)。 Hereinafter, an example of a more systematic method of the white reflective film of the present invention will be described. However, the present invention is not limited to the above-described method, and the same production can be carried out for other aspects with reference to the following. In this case, if the extrusion step is not included, the following "melt extrusion temperature" may be interpreted as, for example, "melting temperature". Further, the melting point of the polyester used herein is Tm (unit: °C), and the glass transition temperature is Tg (unit: °C).

具有反射層A與支撐層B之情形，且作為構成反射層A的熱塑性樹脂A及構成支撐層B的熱塑性樹 脂B為採用聚酯，作為層積方法為採用共擠壓法時，首先，作為用來形成反射層A的熱塑性樹脂組成物A(若作為熱塑性樹脂A為採用聚酯時，此亦稱為聚酯組成物A)，準備混合有聚酯、碳酸鈣粒子、若含有非相溶之樹脂時的作為非相溶之樹脂的環烯烴、與其他的任意成分者。又，作為用來形成支撐層B的熱塑性樹脂組成物B(若作為熱塑性樹脂B為採用聚酯時，此亦稱為聚酯組成物B)，準備混合有聚酯、與其他的任意成分者。在此，關於支撐層B亦可使用未添加其他的任意成分的熱塑性樹脂B(作為如此般之熱塑性樹脂B，例如聚酯)。將該等聚酯組成物乾燥並於充分將水分除去後來使用。 a case where the reflective layer A and the support layer B are provided, and as the thermoplastic resin A constituting the reflective layer A and the thermoplastic tree constituting the support layer B When the fat B is a polyester, and the lamination method is a co-extrusion method, first, as the thermoplastic resin composition A for forming the reflective layer A (if the thermoplastic resin A is a polyester, this is also called The polyester composition A) is prepared by mixing a polyester or calcium carbonate particle, a cycloolefin which is an incompatible resin when an incompatible resin is contained, and any other component. Further, as the thermoplastic resin composition B for forming the support layer B (this is also referred to as polyester composition B when the thermoplastic resin B is a polyester), it is prepared to mix polyester and other optional components. . Here, as the support layer B, a thermoplastic resin B (as such a thermoplastic resin B such as polyester) to which no other optional component is added may be used. The polyester compositions were dried and used after the moisture was sufficiently removed.

又，具有反射層A與表面層C之情形，且作為構成反射層A的熱塑性樹脂A及構成表面層C的熱塑性樹脂C為採用聚酯，作為層積方法為採用共擠壓法時，首先，作為用來形成反射層A的熱塑性樹脂組成物A(若作為熱塑性樹脂A為採用聚酯時，此亦稱為聚酯組成物A)，準備混合有聚酯、碳酸鈣粒子、與其他的任意成分者。又，作為用來形成表面層C的熱塑性樹脂組成物C(若作為熱塑性樹脂C為採用聚酯時，此亦稱為聚酯組成物C)，準備混合有聚酯、表面層粒子、與其他的任意成分者。將該等聚酯組成物乾燥並於充分將水分除去後來使用。 Further, in the case of having the reflective layer A and the surface layer C, the thermoplastic resin A constituting the reflective layer A and the thermoplastic resin C constituting the surface layer C are polyester, and when the lamination method is a co-extrusion method, first As the thermoplastic resin composition A for forming the reflective layer A (when the thermoplastic resin A is a polyester, this is also referred to as a polyester composition A), it is prepared to mix polyester, calcium carbonate particles, and the like. Any component. Further, as the thermoplastic resin composition C for forming the surface layer C (this is also referred to as polyester composition C when the thermoplastic resin C is a polyester), it is prepared to mix polyester, surface layer particles, and the like. Any of the ingredients. The polyester compositions were dried and used after the moisture was sufficiently removed.

接著，將已乾燥的聚酯組成物投入至分別的擠壓機並進行熔融擠壓。熔融擠壓溫度必須為Tm以上， 只要設定為Tm+40℃左右即可。 Next, the dried polyester composition was placed in a separate extruder and melt extruded. The melt extrusion temperature must be Tm or more. Just set it to Tm+40°C or so.

又此時，使用於薄膜之製造的聚酯組成物，特別是使用於反射層A的聚酯組成物A，以使用線徑15μm以下的不銹鋼細線做成的平均篩孔距10μm以上、100μm以下的不織布型濾器來進行過濾為佳。藉由進行該過濾，可抑制通常為凝集並容易形成粗大凝集粒子的粒子之凝集，而得到粗大異物少的薄膜。然後，藉由抑制凝集的粒子，可容易形成微孔，而更抑制熱撓曲。尚，不織布之平均篩孔距較佳為15μm以上，更佳為20μm以上，又，較佳為50μm以下，更佳為40μm以下。又，關於熱塑性樹脂組成物C，較佳為35μm以上，更佳為40μm以上，又，較佳為70μm以下，更佳為60μm以下。過濾後的聚酯組成物，以熔融的狀態下藉由使用供料頭(feed block)的同時多層擠壓法(即，共擠壓法)，從模具以多層狀態擠出，來製造未延伸層積薄片。將從模具被擠出的未延伸層積薄片，於鑄造滾筒(casting drum)下冷卻固化並形成未延伸層積薄膜。 In this case, the polyester composition used for the production of the film, in particular, the polyester composition A used for the reflective layer A, has an average mesh pitch of 10 μm or more and 100 μm or less by using a stainless steel fine wire having a wire diameter of 15 μm or less. It is better to filter the non-woven filter. By performing this filtration, aggregation of particles which are usually aggregated and easily form coarse aggregated particles can be suppressed, and a film having a small amount of foreign matter can be obtained. Then, by suppressing the aggregated particles, the micropores can be easily formed, and the heat deflection can be further suppressed. Further, the average screen pitch of the nonwoven fabric is preferably 15 μm or more, more preferably 20 μm or more, further preferably 50 μm or less, and more preferably 40 μm or less. Further, the thermoplastic resin composition C is preferably 35 μm or more, more preferably 40 μm or more, further preferably 70 μm or less, and more preferably 60 μm or less. The filtered polyester composition is extruded in a multi-layered state by a multi-layer extrusion method (ie, a co-extrusion method) using a feed block in a molten state to produce an unstretched product. Laminated sheets. The unstretched laminated sheet extruded from the mold is cooled and solidified under a casting drum to form an unstretched laminated film.

接著，將該未延伸層積薄膜以輥加熱、紅外線加熱等加熱，在製膜機械軸方向(以下，有稱為縱方向或長邊方向或MD之情形)延伸得到縱延伸薄膜。該延伸較佳為利用2個以上輥的轉速差來進行。縱延伸後的薄膜，接著被引導至拉幅機(tenter)，在垂直於縱方向與厚度方向之方向(以下，有稱為橫方向或寬度方向或TD之情形)延伸，而形成雙軸延伸膜。 Then, the unstretched laminated film is heated by roll heating, infrared heating, or the like, and is stretched in the film forming machine axis direction (hereinafter, referred to as a longitudinal direction or a longitudinal direction or MD) to obtain a longitudinally stretched film. This extension is preferably carried out by using a difference in rotational speed between two or more rolls. The longitudinally stretched film is then guided to a tenter and extended in a direction perpendicular to the longitudinal direction and the thickness direction (hereinafter, referred to as a lateral direction or a width direction or a TD) to form a biaxial extension. membrane.

作為延伸溫度為聚酯之Tg以上，較佳為構成反射層A的聚酯之Tg以上、Tg+30℃以下的溫度來進行為佳，延伸製膜性為更優異，又可較佳形成空孔。又，作為延伸倍率，縱方向、橫方向皆較佳為2.5~4.3倍，更佳為2.7~4.2倍。延伸倍率過低時，薄膜之厚度不均會有變差之傾向，又有不易形成空孔之傾向，另一方面，過高時，製膜中會有容易產生破斷之傾向。尚，在實施縱延伸之後進行橫延伸之類的逐步雙軸延伸時，第2段(即，此情形為橫延伸)之延伸溫度較第1段之延伸溫度還要高10~50℃左右為較佳。這是由於因第1段之延伸造成配向而使得單軸薄膜的Tg升高之緣故。 The elongation temperature is preferably Tg or more of the polyester, more preferably Tg of the polyester constituting the reflective layer A, and a temperature of Tg + 30 ° C or less, and the film forming property is more excellent, and it is preferably formed into an empty space. hole. Further, as the stretching ratio, the longitudinal direction and the lateral direction are preferably 2.5 to 4.3 times, more preferably 2.7 to 4.2 times. When the stretching ratio is too low, the thickness unevenness of the film tends to be deteriorated, and the pores tend to be less likely to be formed. On the other hand, when the stretching ratio is too high, the film tends to be broken. Further, when the stepwise biaxial stretching such as lateral extension is performed after the longitudinal stretching is performed, the extension temperature of the second stage (that is, the lateral extension in this case) is higher than the extension temperature of the first stage by about 10 to 50 ° C. Preferably. This is because the Tg of the uniaxial film is increased due to the alignment caused by the extension of the first stage.

又，在各延伸之前較佳將薄膜進行預熱。例如橫延伸之預熱處理，可以從比聚酯(此較佳為構成反射層A的聚酯)之Tg+5℃更高之溫度開始緩慢升溫。橫延伸過程中的升溫可以是連續的，亦可以是階段性的(亦稱為逐步的)，但通常是逐步升溫。例如將拉幅機的橫延伸區沿著薄膜移動方向分成複數個區域，藉由將每個區域流過指定溫度的加熱媒體來升溫。 Also, the film is preferably preheated prior to each extension. For example, the pre-heat treatment of the transverse stretching may be started from a temperature higher than the Tg + 5 ° C of the polyester (preferably, the polyester constituting the reflective layer A). The temperature rise during the transverse extension can be continuous or periodic (also known as gradual), but is usually a gradual warming. For example, the lateral extent of the tenter is divided into a plurality of regions along the moving direction of the film, and the temperature is raised by flowing each region through a heating medium of a specified temperature.

雙軸延伸後的薄膜，接著依序實施熱固定、熱弛緩(熱鬆弛)之處理來製成雙軸配向薄膜，但可以由熔融擠壓接著進行延伸，該等的處理也可以在使薄膜移動之同時來進行。 The biaxially stretched film is then subjected to heat fixation and thermal relaxation (thermal relaxation) treatment to form a biaxial alignment film, but may be extended by melt extrusion, and the treatment may also be performed to move the film. At the same time.

雙軸延伸後的薄膜，可以在用夾子把持兩端之狀態下，在將聚酯之融點表示為Tm時，在(Tm-10℃) ~(Tm-100℃)下、在恒寬或10%以下的寬度減少下來進行0.01~100秒鐘的熱處理、熱固定、使熱收縮率降低。尚，如此般之融點較佳為構成反射層A的聚酯之融點。如此般之熱處理溫度過高時，薄膜的平面性會有變差之傾向，厚度不均會有變大之傾向。另一方面，過低時，熱收縮率會有變大之傾向。又，藉此可更提升熱撓曲之抑制效果。 The biaxially stretched film can be expressed at the Tm-10°C when the melting point of the polyester is expressed as Tm in the state where the ends are held by the clips. At ~(Tm-100 ° C), the width is reduced by a constant width or 10% or less, and heat treatment is performed for 0.01 to 100 seconds, heat fixation, and the heat shrinkage rate is lowered. Still, such a melting point is preferably a melting point of the polyester constituting the reflective layer A. When the heat treatment temperature is too high, the planarity of the film tends to be deteriorated, and the thickness unevenness tends to become large. On the other hand, when it is too low, the heat shrinkage rate tends to become large. Moreover, the suppression effect of the heat deflection can be further improved by this.

又，為了調整熱收縮量，可以將把持的薄膜的兩端切掉，調整薄膜縱方向的牽引速度，在縱方向進行鬆弛。作為鬆弛之手段是調整拉幅機出口側的輥群之速度。作為鬆弛之比例，相對於拉幅機的薄膜線速度使輥群之速度降低來進行，較佳為0.1~2.5%，更佳為0.2~2.3%，特佳為0.3~2.0%的降速來實施，將薄膜鬆弛(以下，該值亦有稱為「鬆弛率」之情形)，藉由控制鬆弛率來調整縱方向的熱收縮率。又，藉此可更提升熱撓曲之抑制效果。關於薄膜橫方向，可在將兩端切掉之前的過程中使寬度減少，而得到所期望的熱收縮率。 Further, in order to adjust the amount of heat shrinkage, both ends of the held film can be cut off, and the pulling speed in the longitudinal direction of the film can be adjusted to relax in the longitudinal direction. As a means of relaxation, the speed of the roller group on the exit side of the tenter is adjusted. The ratio of the relaxation is performed by lowering the speed of the roll group with respect to the linear velocity of the film of the tenter, preferably 0.1 to 2.5%, more preferably 0.2 to 2.3%, and particularly preferably 0.3 to 2.0%. In the meantime, the film is relaxed (hereinafter, this value is also referred to as "relaxation rate"), and the thermal contraction rate in the longitudinal direction is adjusted by controlling the relaxation rate. Moreover, the suppression effect of the heat deflection can be further improved by this. Regarding the transverse direction of the film, the width can be reduced during the process of cutting both ends to obtain a desired heat shrinkage ratio.

尚，進行雙軸延伸時，除了如上所述般的縱向-橫向的逐步雙軸延伸法以外，亦可以是橫向-縱向的逐步雙軸延伸法。又，亦可以使用同時雙軸延伸法來製膜。同時雙軸延伸法時，延伸倍率是縱方向、橫方向皆為例如2.7~4.3倍，較佳為2.8~4.2倍。 Further, in the case of biaxial stretching, in addition to the longitudinal-transverse stepwise biaxial stretching method as described above, it may be a lateral-longitudinal stepwise biaxial stretching method. Further, it is also possible to form a film by simultaneous biaxial stretching. In the case of the simultaneous biaxial stretching method, the stretching ratio is, for example, 2.7 to 4.3 times, preferably 2.8 to 4.2 times, in the longitudinal direction and the transverse direction.

如此般地可得到本發明的白色反射薄膜。 The white reflective film of the present invention can be obtained in this manner.

[白色反射薄膜之特性] [Characteristics of White Reflective Film] (反射率、正面輝度) (reflectance, positive luminance)

本發明的白色反射薄膜之反射率為60%以上。較佳為70%以上，又較佳為80%以上，更佳為90%以上，特佳為95%以上，最佳為97%以上。藉由使反射率成為上述範圍，使用於液晶顯示裝置或照明等之情形時，可得到高輝度。如此般之反射率可以通過下述而達到：採取提高反射層A之空孔體積率等的較佳樣態、或增加反射層A之厚度，又，若具有支撐層B或表面層C之情形時，採取使該等層中含有空孔形成劑、或使反射面側的支撐層B或表面層C之厚度較反射層A為薄等使各層之樣態成為較佳樣態。 The white reflective film of the present invention has a reflectance of 60% or more. It is preferably 70% or more, more preferably 80% or more, still more preferably 90% or more, particularly preferably 95% or more, and most preferably 97% or more. When the reflectance is in the above range and used in a liquid crystal display device, illumination, or the like, high luminance can be obtained. Such a reflectance can be achieved by adopting a preferred aspect of increasing the void volume ratio of the reflective layer A, or increasing the thickness of the reflective layer A, and further having the support layer B or the surface layer C. In the case where the pore-forming agent is contained in the layers, or the thickness of the support layer B or the surface layer C on the side of the reflection surface is made thinner than that of the reflection layer A, the state of each layer is preferable.

又，正面輝度可藉由如後述的測定方法求得，較佳為2000cd/m2以上，又較佳為3000cd/m2以上，更佳為4000cd/m2以上，特佳為4400cd/m2以上。 Further, the front luminance can be measured by a method described later is obtained, preferably 2000cd / m 2 or more, and preferably 3000cd / m 2 or more, more preferably 4000cd / m 2 or more, particularly preferably 4400cd / m 2 the above.

尚，在此，反射率或正面輝度，係關於作為白色反射薄膜之反射面使用之面之值。 Here, the reflectance or the front luminance is a value relating to the surface used as the reflecting surface of the white reflective film.

(熱撓曲) (heat deflection)

本發明之目的為抑制熱撓曲。所謂的熱撓曲，指例如在電視或螢幕等的製品中來自於用來驅動液晶顯示器等的顯示裝置的電氣電路、或背光模組或光源所產生的熱量，或來自於使用環境的熱量或濕度，而使製品所具備的白色反射薄膜產生撓曲乃至變形之現象。於白色反射薄膜產生 熱撓曲時，將成為輝度斑之原因，將直接造成畫質降低之問題。 The object of the present invention is to suppress heat deflection. The term "heat deflection" refers to, for example, an electric circuit derived from a display device for driving a liquid crystal display or the like, or a heat generated by a backlight module or a light source in a product such as a television or a screen, or heat from a use environment or Humidity causes the white reflective film provided in the product to be deflected or even deformed. Produced on white reflective film When the heat is deflected, it will become the cause of the luminance spot, which will directly cause the problem of lowering the image quality.

[用途] [use]

本發明的白色反射薄膜為大型顯示器用。在此，所謂的大型顯示器，指30吋以上，較佳為32吋以上，又較佳為40吋以上，更佳為42吋以上的液晶顯示器。如此般的大型顯示器，於背面底架設置有用來組裝電氣電路等的凹穴或隔間。因此，由於上述原因等所產生的熱量將局部地滞留於如此般之凹穴，而變得更容易產生熱撓曲。隨著顯示器尺寸之變大，用來確保輝度所必須的光源之數目將變得越多，因電路等亦變得複雜而滞留的熱量將變多，會有更容易產生熱撓曲之傾向。因此，以往的技術難以抑制如此般的大型顯示器中的熱撓曲。對此，本發明即使是如此般的大型顯示器，亦可良好地抑制熱撓曲。 The white reflective film of the present invention is used for large displays. Here, the so-called large-sized display refers to a liquid crystal display of 30 Å or more, preferably 32 Å or more, more preferably 40 Å or more, and still more preferably 42 Å or more. In such a large display, a recess or a compartment for assembling an electric circuit or the like is provided on the rear chassis. Therefore, heat generated due to the above reasons or the like is locally retained in such a cavity, and heat deflection is more likely to occur. As the size of the display becomes larger, the number of light sources necessary for ensuring the luminance becomes larger, and the number of heats that are accumulated due to the complexity of the circuit and the like increases, and there is a tendency that heat deflection is more likely to occur. Therefore, it has been difficult in the prior art to suppress heat deflection in such a large display. In view of this, the present invention can suppress heat deflection well even in such a large display.

〔實施例〕 [Examples]

以下，藉由實施例來詳述本發明。尚，各特性值係用以下之方法來測定。 Hereinafter, the present invention will be described in detail by way of examples. Further, each characteristic value was measured by the following method.

(1)光線反射率 (1) Light reflectance

在分光光度計(島津製作所製UV-3101PC)上安裝積分球，在波長550nm下測定以BaSO4白板為100%時的反射率，將該值作為反射率。尚，測定係在使用作為反射面之 側(即為光源側)之表面來進行測定。 The integrating sphere was attached to a spectrophotometer (UV-3101PC manufactured by Shimadzu Corporation), and the reflectance when the BaSO 4 whiteboard was 100% was measured at a wavelength of 550 nm, and this value was used as a reflectance. In addition, the measurement was performed using the surface which is the side of the reflection surface (that is, the side of the light source).

(2)粒子之平均粒徑 (2) Average particle size of particles

使用島津製作所製鐳射散射式粒度分布測定裝置SALD-7000來進行測定。測定前的對乙二醇之分散，係以成為相當於5質量%漿料濃度之方式來計量粒子粉體，並使用混合機攪拌10分鐘，冷卻至常溫後供給於流通槽方式供給裝置。在此，作為混合機可使用例如National MXV253型料理用混合機。然後，為了在該供給裝置中脫泡而施以30秒鐘超音波處理後供給於測定。尚，如此般之超音波處理中的超音波強度，將超音波處理裝置的旋鈕中顯示為MAX值之位置的60%位置設定為該強度。藉由粒度分布測定結果求得50%體積粒徑(D50)，將其設定為平均粒徑。又，相同地操作得到10%體積粒徑(D10)及90%體積粒徑(D90)。 The measurement was carried out using a laser scattering type particle size distribution measuring apparatus SALD-7000 manufactured by Shimadzu Corporation. In the dispersion of ethylene glycol before the measurement, the particle powder was measured so as to have a slurry concentration of 5% by mass, and the mixture was stirred for 10 minutes using a mixer, and then cooled to normal temperature, and then supplied to a flow cell type supply device. Here, as the mixer, for example, a National MXV 253 type cooking mixer can be used. Then, in order to defoam in the supply device, ultrasonic treatment was applied for 30 seconds and then supplied to the measurement. Still, the ultrasonic intensity in the ultrasonic processing is set to 60% of the position of the knob of the ultrasonic processing device displayed as the MAX value. From the particle size distribution measurement results, a 50% by volume particle diameter (D50) was determined, which was set as an average particle diameter. Further, 10% by volume (D10) and 90% by volume (D90) were obtained in the same manner.

(3)粒子及非相溶之樹脂之含量 (3) Content of particles and incompatible resins (3-1)粒子之含量 (3-1) Content of particles

將薄膜以500℃之溫度燃燒6小時，測定其燃燒前後之重量，將殘餘灰分之重量設定為粒子之含量。尚，層積體中的各層的粒子之含量，係將各層分離後藉由進行前述操作而求得。 The film was burned at a temperature of 500 ° C for 6 hours, and the weight before and after the combustion was measured, and the weight of the residual ash was set as the content of the particles. Further, the content of the particles in each layer in the laminate was determined by separating the layers and performing the above operation.

(3-2)非相溶之樹脂之含量 (3-2) Content of incompatible resin

秤量薄膜後，使溶解於六氟異丙醇(HFIP)/氯仿之質量比50/50之混合溶劑中，若有不溶成分時，以離心分離取出該不溶成分後，測定質量並藉由元素分析、FT-IR、NMR法來測定該成分之構造與質量分率。關於上清成分亦相同地來進形分析，可界定聚酯成分及其他成分之質量分率與構造。將溶劑從上清成分中餾除後，使溶解於HFIP/氯仿之質量比50/50之混合溶劑中，之後測定1H-NMR頻譜。 After weighing the film, it is dissolved in a mixed solvent of hexafluoroisopropanol (HFIP)/chloroform in a mass ratio of 50/50. If there is an insoluble component, the insoluble component is taken out by centrifugation, and the mass is measured and analyzed by elemental analysis. FT-IR and NMR methods were used to determine the structure and mass fraction of the component. The composition of the polyester component and other components can be defined by the same analysis of the supernatant components. The solvent was distilled off from the supernatant component, and then dissolved in a mixed solvent of HFIP/chloroform in a mass ratio of 50/50, and then the 1 H-NMR spectrum was measured.

由所得之頻譜來求得各成分所特有的吸收峰的面積強度，依據該比率與質子數來計算出摻合之莫耳比。進而依據相當於聚合物的單位單元之式量來計算出質量比。以如此般操作來界定各成分之質量分率與構造。 From the obtained spectrum, the area intensity of the absorption peak peculiar to each component was obtained, and the blended molar ratio was calculated from the ratio and the number of protons. Further, the mass ratio is calculated based on the amount of the unit unit corresponding to the polymer. The mass fraction and structure of each component are defined in such a manner.

尚，層積體中的各層的粒子之含量，係將各層分離後藉由進行前述操作而求得。 Further, the content of the particles in each layer in the laminate was determined by separating the layers and performing the above operation.

(4)薄膜厚度及層構成 (4) Film thickness and layer composition

用切片機將白色反射薄膜切片以暴露斷面，對於如此般之斷面，使用日立製作所生產的S-4700型電場發射掃描電子顯微鏡在500倍的倍率下觀測該斷面，分別求出薄膜全體、反射層A、支撐層B、表面層C之厚度。厚度之測定係以n=7來測定任意位置並以平均值求得。求得各層之厚度(μm)後來計算出各層之厚度比。 The white reflective film was sliced with a microtome to expose the cross section. For such a cross section, the cross section was observed at a magnification of 500 times using an S-4700 electric field emission scanning electron microscope produced by Hitachi, and the entire film was obtained. The thickness of the reflective layer A, the support layer B, and the surface layer C. The thickness was measured at an arbitrary position by n = 7 and was determined by an average value. The thickness (μm) of each layer was obtained and the thickness ratio of each layer was calculated.

(5)空孔體積率之算出 (5) Calculation of void volume ratio

由求空孔體積率的層的聚合物、添加粒子、其他各成分的密度以及調配比例來求得計算密度。同時將該層通過剝離等進行分離，測定質量及體積，由該等計算出實際密度，由計算密度及實際密度通過下述式來求得空孔體積率。 The calculated density was determined from the density of the polymer, the added particles, and the other components of the layer having the void volume fraction. At the same time, the layer was separated by peeling or the like, and the mass and volume were measured, and the actual density was calculated from the above, and the void volume ratio was determined from the calculated density and the actual density by the following formula.

空孔體積率=100×(1-(實際密度/計算密度)) Empty hole volume ratio = 100 × (1 - (actual density / calculated density))

尚，雙軸延伸後的間苯二甲酸共聚合聚對苯二甲酸乙二酯之密度為1.39g/cm3，碳酸鈣粒子之密度為2.7g/cm3，硫酸鋇粒子之密度為4.5g/cm3，非相溶之樹脂的環烯烴共聚物之密度為1.02g/cm3。 Further, the density of the isophthalic acid copolymerized polyethylene terephthalate after the biaxial stretching is 1.39 g/cm 3 , the density of the calcium carbonate particles is 2.7 g/cm 3 , and the density of the barium sulfate particles is 4.5 g. /cm 3 , the density of the cyclic olefin copolymer of the incompatible resin was 1.02 g/cm 3 .

又，僅將測定空孔體積率之層分離，求得單位體積的質量，從而求得實際密度。體積如下算出：將樣品切出3cm2的面積，用電測微計(Anritsu製的K-402B)測定該尺寸的厚度，測定10點取平均值作為厚度，以面積×厚度的形式算出體積。用電子天秤來稱量質量。 Further, only the layer having the measured pore volume fraction was separated, and the mass per unit volume was determined to obtain the actual density. The volume was calculated as follows: The sample was cut out to an area of 3 cm 2 , and the thickness of the size was measured with an electric micrometer (K-402B manufactured by Anritsu), and an average value of 10 points was measured as a thickness, and the volume was calculated in the form of area×thickness. Use electronic scales to weigh the quality.

尚，作為包含凝集粒子的其他的粒子之比重，係使用通過以下的量筒法求得的體積比重之值。往容積1000ml的量筒中填充絕對乾燥狀態的粒子，測定全體之重量，從該全體之重量減去量筒之重量求得該粒子之重量，測定該量筒之容積，用該粒子之重量(g)除以該容積(cm3)來求得。 Further, as the specific gravity of the other particles including the aggregated particles, the value of the bulk specific gravity determined by the following cylinder method is used. The measuring cylinder having a volume of 1000 ml was filled with particles in an absolute dry state, and the total weight was measured. The weight of the measuring cylinder was obtained by subtracting the weight of the measuring cylinder from the total weight, and the volume of the measuring cylinder was measured and divided by the weight (g) of the particle. It is obtained by this volume (cm 3 ).

(6)融點、玻璃轉移溫度 (6) melting point, glass transition temperature

使用示差掃描熱量測定裝置(TA Instruments 2100 DSC)，以20℃/分的升溫速度來進行測定。 The measurement was carried out at a temperature elevation rate of 20 ° C /min using a differential scanning calorimeter (TA Instruments 2100 DSC).

(7)正面輝度 (7) Positive luminance (7-1)正面輝度1 (7-1) Positive luminance 1

從LG公司製的側光型LED液晶電視(LG42LE5310AKR)(42吋)中取出反射薄膜，使用實施例所得之各種反射薄膜來取代該取出的反射薄膜，並以反射薄膜之反射面側設置在畫面側之方式，在原本即具備的擴散薄膜及稜鏡薄片為裝配的背光模組之狀態下，使用輝度計(大塚電子製Model MC-940)來測定輝度。 The reflective film was taken out from the edge-light type LED liquid crystal television (LG42LE5310AKR) (42吋) manufactured by LG, and the various reflective films obtained in the examples were used instead of the taken-out reflective film, and the reflective surface side of the reflective film was placed on the screen. In the side mode, the brightness was measured using a luminance meter (Model MC-940 manufactured by Otsuka Electronics Co., Ltd.) in the state in which the diffusion film and the ruthenium sheet which were originally provided were assembled backlight modules.

(7-2)正面輝度2 (7-2) Positive luminance 2

從LG公司製的直下LED燈型液晶電視(LG LN5400)(42吋)中取出反射薄膜，使用實施例所得之各種反射薄膜來取代該取出的反射薄膜，並以反射薄膜之反射面側設置在畫面側之方式，在原本即具備的擴散薄膜及稜鏡薄片為裝配的背光模組之狀態下，使用輝度計(大塚電子製Model MC-940)來測定輝度。 The reflective film was taken out from a direct-lit LED light-emitting liquid crystal television (LG LN5400) (42 吋) manufactured by LG, and the various reflective films obtained in the examples were used instead of the taken-out reflective film, and the reflecting surface side of the reflective film was placed on the reflective surface. In the state of the screen side, the brightness is measured using a luminance meter (Model MC-940 manufactured by Otsuka Electronics Co., Ltd.) in a state in which the diffusion film and the ruthenium sheet which are originally provided are the assembled backlight modules.

(8)延伸製膜性 (8) Extended film forming

將實施例記載的薄膜使用拉幅機以連續製膜法來進行製膜，觀察此時之製膜安定性，並依據下述基準來評價。 The film described in the examples was formed into a film by a continuous film forming method using a tenter, and the film forming stability at this time was observed, and evaluated according to the following criteria.

◎：可8小時以上安定製膜。 ◎: It can be customized for more than 8 hours.

○：可3小時以上未滿8小時安定製膜。 ○: Custom film can be used for 3 hours or more and less than 8 hours.

△：未滿3小時即產生1次切斷。 △: One cut occurred after less than 3 hours.

×：未滿3小時即產生複數次切斷而無法安定製膜。 ×: A plurality of cuts occurred after less than 3 hours, and the film could not be customized.

(9)熱撓曲評價 (9) Thermal deflection evaluation

將LG公司製的側光型LED液晶電視(LG42LE5310AKR)(42吋)分解，取出其原本具備的反射薄膜，配置實施例的白色反射薄膜來取代之，組裝電視並以該狀態使電視以白色顯示點燈，以該狀態保管於溫度50℃、濕度80%RH的環境中72小時，評價其前後之輝度斑。 The sidelight type LED liquid crystal television (LG42LE5310AKR) (42吋) manufactured by LG Corporation was disassembled, and the original reflective film was taken out, and the white reflective film of the example was placed instead of the white reflective film, and the television was assembled and the television was displayed in white in this state. The lighting was stored in an environment of a temperature of 50 ° C and a humidity of 80% RH for 72 hours in this state, and the luminance spots before and after the evaluation were evaluated.

(9-1)輝度斑評價1 (9-1) Luminance spot evaluation 1

以目視判斷輝度斑，並以下述基準進行評價 The luminance spots were visually judged and evaluated on the basis of the following criteria.

○：完全未看到輝度斑。 ○: No luminance spots were observed at all.

△：勉強確認到輝度斑。 △: The luminance spot was barely confirmed.

×：可看到顯著的輝度斑。 ×: Significant luminance spots can be seen.

(9-2)輝度斑評價2 (9-2) Luminance spot evaluation 2

使用輝度計(Konicaminolta公司製CA-2000)對於畫面內平均、任意的10點進行輝度測定，以畫面內的[(最高輝度-最低輝度)/平均輝度]之值來進行評價。上述之值若為5%以下時，可判定因熱撓曲所造成的輝度斑為少且為良好之狀態。較佳為4%以下，更佳為3%以下。 Using a luminance meter (CA-2000 manufactured by Konicaminolta Co., Ltd.), the luminance was measured at an average of 10 points in the screen, and the value was evaluated by the value of [(highest luminance - minimum luminance) / average luminance] in the screen. When the value is 5% or less, it can be judged that the luminance spot due to heat deflection is small and is in a good state. It is preferably 4% or less, more preferably 3% or less.

(10)導光板黏貼評價 (10) Light guide plate adhesion evaluation

從LG公司製的LED液晶電視(LG42LE5310AKR)中取出底架，以電視內部側為朝上之方式放置於水平的桌子上，於其上方，將與底架為約同等大小的反射薄膜，以該反射薄膜的表面層面為朝上之方式放置，進而於其上方放置電視原本即具備的導光板及光學薄片3片(所謂的如此般之光學薄片3片，指擴散薄膜2片及稜鏡1片)。接著，於其面內，在包含底架之凹凸最大的部分的區域，如圖1所示般放置具有三條直徑為5mm的圓柱狀腳的正三角形型式之台，在其上進而載置15kg的重物，目測觀察如此般之三條腳所圍成之區域，若未有異常亮的部分則為「未有密著斑」，即評價為○。又，有異常亮的部分時，在3片光學薄片上進而放置電視原本即具備的DBEF薄片，同樣地目測觀察，異常亮的部分若未被矯正過來則為「有密著斑」，即評價為×，若異常亮的部分消失則為「幾乎未有密著斑」，即評價為△。尚，三條腳所圍成的區域是各邊的長度為10cm的約略正三角形。 The chassis is taken out from the LED LCD TV (LG42LE5310AKR) manufactured by LG, and placed on a horizontal table with the inner side of the TV facing upward. Above it, a reflective film of about the same size as the chassis is used. The surface layer of the reflective film is placed in an upward direction, and then the light guide plate and the optical sheet 3 which are originally provided on the TV are placed thereon (the so-called optical sheet 3, which refers to the diffusion film 2 pieces and 1 piece) ). Next, in the area including the portion where the convex portion of the chassis is the largest, as shown in Fig. 1, a table of three triangular-shaped legs having a diameter of 5 mm is placed, and 15 kg is placed thereon. Heavy objects, visually observe the area enclosed by such three feet, if there is no abnormally bright part, it is "no close spot", that is, it is evaluated as ○. In addition, when there is an abnormally bright portion, the DBEF sheet which is originally provided in the television is placed on the three optical sheets, and the DBEF sheet which is originally provided in the television is visually observed in the same manner. If the abnormally bright portion is not corrected, it is "closed spot", that is, evaluation If it is ×, if the abnormally bright part disappears, it is "almost no dense spots", that is, it is evaluated as △. Still, the area enclosed by the three legs is an approximately regular triangle with a length of 10 cm on each side.

<製造例1：間苯二甲酸共聚合聚對苯二甲酸乙二酯1之合成> <Production Example 1: Synthesis of isophthalic acid copolymerized polyethylene terephthalate 1>

將對苯二甲酸二甲酯136.5質量份、間苯二甲酸二甲酯13.5質量份(即，相對於所得之聚酯之全酸成分100莫耳%，間苯二甲酸成分為9莫耳%)、乙二醇98質量份、 二乙二醇1.0質量份、乙酸錳0.05質量份、乙酸鋰0.012質量份裝入具備有精餾塔、餾出冷凝器的燒瓶中，邊攪拌邊加熱至150~240℃來將甲醇餾出，使進行酯交換反應。甲醇餾出後，添加磷酸三甲酯0.03質量份、二氧化鍺0.04質量份，將反應物移動至反應器中。接著，邊攪拌邊將反應器內緩慢減壓至0.3mmHg，同時升溫至292℃來進行縮聚合反應，而得到間苯二甲酸共聚合聚對苯二甲酸乙二酯1。該聚合物之融點為235℃。 136.5 parts by mass of dimethyl terephthalate and 13.5 parts by mass of dimethyl isophthalate (that is, 100 mol% relative to the total acid component of the obtained polyester, and 9 mol% of the isophthalic acid component) ), 98 parts by mass of ethylene glycol, 1.0 part by mass of diethylene glycol, 0.05 parts by mass of manganese acetate, and 0.012 parts by mass of lithium acetate were placed in a flask equipped with a rectification column and a distillation condenser, and heated to 150 to 240 ° C with stirring to distill off methanol. The transesterification reaction is carried out. After the methanol was distilled off, 0.03 parts by mass of trimethyl phosphate and 0.04 parts by mass of cerium oxide were added, and the reactant was moved to the reactor. Next, the inside of the reactor was gradually reduced to 0.3 mmHg while stirring, and the temperature was raised to 292 ° C to carry out a polycondensation reaction to obtain an isophthalic acid copolymerized polyethylene terephthalate 1. The polymer had a melting point of 235 °C.

<製造例2：間苯二甲酸共聚合聚對苯二甲酸乙二酯2之合成> <Production Example 2: Synthesis of isophthalic acid copolymerized polyethylene terephthalate 2>

除了變更為對苯二甲酸二甲酯129.0質量份、間苯二甲酸二甲酯21.0質量份(即，相對於所得之聚酯之全酸成分100莫耳%，間苯二甲酸成分為14莫耳%)以外，其餘與上述製造例1為相同操作，得到間苯二甲酸共聚合聚對苯二甲酸乙二酯2。該聚合物之融點為215℃。 In addition to changing to 129.0 parts by mass of dimethyl terephthalate and 21.0 parts by mass of dimethyl isophthalate (ie, 100 mol% relative to the total acid component of the obtained polyester, the isophthalic acid component is 14 mol) Except for the above-mentioned Production Example 1, except that the ear %), the isophthalic acid copolymerized polyethylene terephthalate 2 was obtained. The polymer had a melting point of 215 °C.

<製造例3：粒子母料切片(master chip)1之製作> <Production Example 3: Production of particle masterbatch 1 (master chip) 1>

使用上述所得之間苯二甲酸共聚合聚對苯二甲酸乙二酯1之一部分、及作為空孔形成劑的平均粒徑0.9μm、(D90-D10)/D50為1.4之合成碳酸鈣粒，利用神戸製鋼公司製NEX-T60串聯式擠壓機，以合成碳酸鈣粒子之含量對所得之母料切片之質量為60質量%之方式進行混合，在樹脂溫度260℃進行擠出，來製作含有合成碳酸鈣粒子 的粒子母料切片1。尚，如此般之合成碳酸鈣粒子係藉由磷酸三甲酯來施予表面處理。 Using the above-mentioned obtained part of the terephthalic acid copolymerized polyethylene terephthalate 1 and the synthetic calcium carbonate particles having an average particle diameter of 0.9 μm and a (D90-D10)/D50 of 1.4 as a pore-forming agent, The NEX-T60 tandem extruder manufactured by Kobelco Co., Ltd. was used to mix the mass of the obtained masterbatch slurries by the content of the synthetic calcium carbonate particles, and the mixture was extruded at a resin temperature of 260 ° C to produce a content. Synthetic calcium carbonate particles Particle masterbatch slice 1. Still, the synthetic calcium carbonate particles are subjected to surface treatment by trimethyl phosphate.

<製造例4：粒子母料切片2之製作> <Manufacturing Example 4: Production of Particle Masterbatch Slice 2>

除了使用上述所得之間苯二甲酸共聚合聚對苯二甲酸乙二酯2來取代間苯二甲酸共聚合聚對苯二甲酸乙二酯1以外，其餘與上述製造例3為相同操作，來製作含有合成碳酸鈣粒子的粒子母料切片2。 The same operation as in the above Production Example 3 was carried out except that the above-obtained terephthalic acid copolymerized polyethylene terephthalate 2 was used instead of the isophthalic acid copolymerized polyethylene terephthalate 1. A pellet masterbatch 2 containing synthetic calcium carbonate particles was prepared.

<製造例5：粒子母料切片3之製作> <Production Example 5: Production of Particle Masterbatch Slice 3>

將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑6.5μm的粒子並作為粒子A，以所得之粒子母料切片中的濃度成為8質量%之方式，利用雙軸擠壓機將粒子A混合至上述所得之間苯二甲酸共聚合聚對苯二甲酸乙二酯2中，在熔融溫度250℃進行擠出，來製作粒子母料切片3。 AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 6.5 μm as particles A, and the concentration in the obtained particle masterbatch was 8 mass%. The particles A were mixed into the above-mentioned obtained terephthalic acid copolymerized polyethylene terephthalate 2 by a twin-screw extruder, and extruded at a melting temperature of 250 ° C to prepare a particle master batch 3 .

<製造例6：使用於珠粒層的粒子1之製作> <Production Example 6: Production of Particles 1 Used in Bead Layer>

將對苯二甲酸二甲酯150質量份、乙二醇98質量份、二乙二醇1.0質量份、乙酸錳0.05質量份、乙酸鋰0.012質量份裝入具備有精餾塔、餾出冷凝器的燒瓶中，邊攪拌邊加熱至150~240℃來將甲醇餾出，使進行酯交換反應。甲醇餾出後，添加磷酸三甲酯0.03質量份、二氧化鍺0.04質量份，將反應物移動至反應器中。接著， 邊攪拌邊將反應器內緩慢減壓至0.3mmHg，同時升溫至292℃來進行縮聚合反應，而得到聚對苯二甲酸乙二酯3。將所得之聚對苯二甲酸乙二酯3從股狀模具進行擠壓，冷卻後裁斷，藉此使成為顆粒狀。調整為股狀之形狀之結果，該顆粒之形狀幾乎為直方體之形狀，形狀之平均為4mm×3mm×2mm者。接著，將所得之顆粒在烘箱內以170℃加熱3小時，藉此來使乾燥結晶化，使用(股)Matsubo製的細磨機(atomizer mill)TAP-1，以液體氮邊冷卻邊進行粉碎，而得到平均粒徑60μm的聚酯粒子。進而，藉由將該聚酯粒子予以風力分級而得到平均粒徑43μm的粒子1(此係非球狀粒子)。 150 parts by mass of dimethyl terephthalate, 98 parts by mass of ethylene glycol, 1.0 part by mass of diethylene glycol, 0.05 parts by mass of manganese acetate, and 0.012 parts by mass of lithium acetate were charged with a rectification column and a distillation condenser. The flask was heated to 150 to 240 ° C while stirring to distill off methanol to carry out a transesterification reaction. After the methanol was distilled off, 0.03 parts by mass of trimethyl phosphate and 0.04 parts by mass of cerium oxide were added, and the reactant was moved to the reactor. then, The inside of the reactor was gradually reduced to 0.3 mmHg while stirring, and the temperature was raised to 292 ° C to carry out a polycondensation reaction to obtain polyethylene terephthalate 3. The obtained polyethylene terephthalate 3 was extruded from a strand mold, cooled, and cut, thereby being pelletized. As a result of adjustment to the shape of the strand, the shape of the pellet was almost a shape of a rectangular parallelepiped, and the average shape was 4 mm × 3 mm × 2 mm. Next, the obtained pellets were heated at 170 ° C for 3 hours in an oven to thereby crystallization by drying, and pulverized by liquid nitrogen cooling using an atomizer mill TAP-1 (manufactured by Matsuto). Thus, polyester particles having an average particle diameter of 60 μm were obtained. Further, the polyester particles were subjected to wind classification to obtain particles 1 having an average particle diameter of 43 μm (this type of non-spherical particles).

[實施例1-1] [Example 1-1] (白色反射薄膜之製造) (Manufacture of white reflective film)

分別採用上述得到的間苯二甲酸共聚合聚對苯二甲酸乙二酯1與粒子母料切片1作為反射層(A層)的原料、間苯二甲酸共聚合聚對苯二甲酸乙二酯2與粒子母料切片2作為支撐層(B層)的原料，將分別之層以成為如表1記載之構成之方式進行混合，投入於擠壓機中，A層係以通過平均篩孔距30μm的不織布型濾器後以熔融擠壓溫度255℃，B層係以通過平均篩孔距30μm的不織布型濾器後以熔融擠壓溫度230℃，使用如表1所示般成為B層/A層/B層的層構成的3層供料頭裝置使該等合流，保持該層積狀態下藉由塑模成形為薄片狀。此時，使B層/A層/B 層之厚度比在雙軸延伸後成為10/80/10之方式，以各擠壓機之吐出量來進行調整。進而，將該薄片以表面溫度25℃的冷卻滾筒予以冷卻固化，使成為未延伸薄膜。將該未延伸薄膜通過73℃的預熱區、然後75℃的預熱區，引導到保持92℃之縱延伸區，朝縱方向延伸3.0倍，用25℃的輥群予以冷卻。接著，將薄膜之兩端用夾子保持之同時使其通過115℃的預熱區，引導到保持130℃之橫延伸區，朝橫方向延伸3.6倍。之後在拉幅機內連續進行：155℃、10秒鐘的熱處理；200℃、10秒鐘的熱固定；155℃、10秒鐘的熱處理，然後在縮幅率2%、縮幅溫度130℃下進形橫方向之縮幅，接著切落薄膜兩端，以縱鬆弛率2.5%進行熱鬆弛，冷卻到室溫為止，得到厚度300μm的薄膜。將所得之薄膜之評價結果表示於表1。 The isophthalic acid copolymerized polyethylene terephthalate 1 and the particle masterbatch 1 obtained as the raw material of the reflective layer (layer A) and the isophthalic acid copolymerized polyethylene terephthalate were respectively used. 2, and the particle masterbatch 2 as a raw material of the support layer (layer B), the respective layers were mixed as shown in Table 1, and placed in an extruder, and the layer A was passed through an average sieve pitch. The 30 μm non-woven filter was melted at a temperature of 255 ° C, and the B layer was passed through a non-woven filter having an average mesh opening distance of 30 μm, and then melted at a temperature of 230 ° C to form a B layer/A layer as shown in Table 1. The three-layer supply head device composed of the layer of the /B layer allows the confluence to be formed into a sheet shape by molding while maintaining the laminated state. At this time, make layer B / layer A / B The thickness ratio of the layer was adjusted to 10/80/10 after the biaxial stretching, and the amount of discharge of each extruder was adjusted. Further, the sheet was cooled and solidified by a cooling drum having a surface temperature of 25 ° C to form an unstretched film. The unstretched film was passed through a preheating zone of 73 ° C and then a preheating zone of 75 ° C to a longitudinally extending zone maintained at 92 ° C, extended 3.0 times in the longitudinal direction, and cooled by a roll of 25 ° C. Next, both ends of the film were held by a clip while passing through a preheating zone of 115 ° C, and guided to a laterally extending region of 130 ° C, extending 3.6 times in the lateral direction. Then, it was continuously carried out in a tenter: heat treatment at 155 ° C for 10 seconds; heat fixation at 200 ° C for 10 seconds; heat treatment at 155 ° C for 10 seconds, followed by a shrinkage rate of 2% and a shrinkage temperature of 130 ° C. The lowering direction was narrowed in the transverse direction, and then both ends of the film were cut, and the film was thermally relaxed at a longitudinal relaxation rate of 2.5%, and cooled to room temperature to obtain a film having a thickness of 300 μm. The evaluation results of the obtained film are shown in Table 1.

[實施例1-2~1-9、1-11、比較例1-1~1-6] [Examples 1-2 to 1-9, 1-11, and Comparative Examples 1-1 to 1-6]

除了將粒子之樣態、薄膜之構成以設定如表1所示以外，其餘與實施例1-1為相同操作而得到白色反射薄膜。將所得之薄膜之評價結果表示於表1。尚，使用的合成碳酸鈣粒子係藉由磷酸三甲酯來施予表面處理。 A white reflective film was obtained in the same manner as in Example 1-1 except that the state of the particles and the composition of the film were set as shown in Table 1. The evaluation results of the obtained film are shown in Table 1. Further, the synthetic calcium carbonate particles used were subjected to surface treatment by trimethyl phosphate.

實施例1-11之薄膜之總厚度設為188μm。 The total thickness of the films of Examples 1 to 11 was set to 188 μm.

[比較例1-7] [Comparative Example 1-7]

除了作為空孔形成劑為使用平均粒徑0.9μm、(D90-D10)/D50為1.4的硫酸鋇粒子來取代碳酸鈣粒子以外，其 餘與製造例3、4為相同操作來製作粒子母料切片，又，除了薄膜之構成如表1所示以外，其餘與實施例1-1為相同操作而得到白色反射薄。將所得之薄膜之評價結果表示於表1。尚，如此般之硫酸鋇粒子係藉由重複進行風力分級而得到。 In addition to replacing the calcium carbonate particles with barium sulfate particles having an average particle diameter of 0.9 μm and (D90-D10)/D50 of 1.4 as a pore-forming agent, The pellet masterbatch was prepared in the same manner as in Production Examples 3 and 4, and the white reflection was obtained in the same manner as in Example 1-1, except that the composition of the film was as shown in Table 1. The evaluation results of the obtained film are shown in Table 1. Still, such a barium sulfate particle is obtained by repeating the wind classification.

[實施例1-10] [Example 1-10]

在與實施例1-1為相同操作而得到的雙軸延伸薄膜之單面上，使用直接凹版塗佈裝置，將由下述用來形成珠粒層的塗液1所示之組成而成的塗液以濕厚度為15g/m2的塗佈量進行塗佈，之後在烘箱內以100℃乾燥，得到具有珠粒層的白色反射薄膜。將所得之薄膜之評價結果表示於表1。尚，評價中將珠粒層側作為反射面使用。 On one side of the biaxially stretched film obtained in the same manner as in Example 1-1, a direct gravure coating apparatus was used to coat the composition shown by the coating liquid 1 for forming a bead layer described below. The liquid was applied at a coating amount of a wet thickness of 15 g/m 2 , and then dried at 100 ° C in an oven to obtain a white reflective film having a bead layer. The evaluation results of the obtained film are shown in Table 1. In addition, in the evaluation, the side of the bead layer was used as a reflecting surface.

<塗液1、固形分濃度30質量%> <coating liquid 1, solid content concentration 30% by mass>

‧粒子：上述製造例6所得之粒子1(非球狀粒子)……7.5質量% ‧ Particles: Particle 1 (non-spherical particles) obtained in the above Production Example 6 ... 7.5% by mass

‧丙烯酸樹脂(熱塑性樹脂)：DIC公司製Acrydic A-817BA(固形分濃度50質量%)……30質量% ‧Acrylic resin (thermoplastic resin): Acrydic A-817BA (solid content concentration: 50% by mass) made by DIC Corporation... 30% by mass

‧交聯劑：Nippon Polyurethane Industry公司製Coronate HL(異氰酸酯系交聯劑、固形分濃度75質量%)……10質量% ‧ Crosslinking agent: Coronate HL (isocyanate crosslinking agent, solid content concentration: 75 mass%) manufactured by Nippon Polyurethane Industry Co., Ltd. 10% by mass

‧稀釋溶劑：乙酸丁酯……52.5質量% ‧Diluting solvent: butyl acetate... 52.5 mass%

尚，塗液1中的各成分的固形分比率如同下述。 Further, the solid content ratio of each component in the coating liquid 1 is as follows.

‧粒子：25質量% ‧ Particles: 25% by mass

‧丙烯酸樹脂(熱塑性樹脂)：50質量% ‧Acrylic resin (thermoplastic resin): 50% by mass

‧交聯劑：25質量% ‧ Crosslinker: 25% by mass

[實施例2-1] [Example 2-1] (白色反射薄膜之製造) (Manufacture of white reflective film)

分別採用上述得到的間苯二甲酸共聚合聚對苯二甲酸乙二酯1與粒子母料切片1及非相溶之樹脂(環烯烴共聚物、Tg=210℃、Polyplastics公司製「TOPAS」)作為反射層(A層)的原料、間苯二甲酸共聚合聚對苯二甲酸乙二酯2與粒子母料切片2作為支撐層(B層)的原料，將分別之層以成為如表2記載之構成之方式進行混合，投入於擠壓機中，A層係以通過平均篩孔距30μm的不織布型濾器後以熔融擠壓溫度255℃，B層係以通過平均篩孔距30μm的不織布型濾器後以熔融擠壓溫度230℃，使用如表2所示般成為B層/A層/B層的層構成的3層供料頭裝置使該等合流，保持該層積狀態下藉由塑模成形為薄片狀。此時，使B層/A層/B層之厚度比在雙軸延伸後成為10/80/10之方式，以各擠壓機之吐出量來進行調整。進而，將該薄片以表面溫度25℃的冷卻滾筒予以冷卻固化，使成為未延伸薄膜。將該未延伸薄膜通過73℃的預熱區、然後75℃的預熱區，引導到保持92℃之縱延伸區，朝縱方向延伸3.0倍，用25℃的輥群予以冷卻。接著，將薄膜之兩端用夾子保持之同時使其通過115℃的預熱區，引導到保持130℃之橫延伸區，朝橫方向延伸3.6倍。之後在拉幅機內連續進行：155℃、10秒鐘的熱處理；200℃、10秒鐘的熱固定；155℃、10秒鐘的熱處 理，然後在縮幅率2%、縮幅溫度130℃下進形橫方向之縮幅，接著切落薄膜兩端，以縱鬆弛率2.5%進行熱鬆弛，冷卻到室溫為止，得到厚度300μm的薄膜。將所得之薄膜之評價結果表示於表2。 The isophthalic acid copolymerized polyethylene terephthalate 1 obtained above and the particle masterbatch 1 and the incompatible resin (cycloolefin copolymer, Tg = 210 ° C, "TOPAS" manufactured by Polyplastics Co., Ltd.) were respectively used. As a raw material of the reflective layer (layer A), isophthalic acid copolymerized polyethylene terephthalate 2 and particle masterbatch 2 as raw materials of the support layer (layer B), the respective layers are as shown in Table 2. The composition was mixed and put into an extruder. The layer A was passed through a non-woven filter having an average sieve opening distance of 30 μm, and the melt extrusion temperature was 255 ° C. The B layer was passed through a non-woven fabric having an average sieve pitch of 30 μm. After the filter was melted at a temperature of 230 ° C, a three-layer supply head device composed of a layer of a B layer/A layer/B layer as shown in Table 2 was used to make the combined flow while maintaining the laminated state. The mold is formed into a sheet shape. At this time, the thickness ratio of the B layer/A layer/B layer was adjusted to be 10/80/10 after the biaxial stretching, and the amount of discharge of each extruder was adjusted. Further, the sheet was cooled and solidified by a cooling drum having a surface temperature of 25 ° C to form an unstretched film. The unstretched film was passed through a preheating zone of 73 ° C and then a preheating zone of 75 ° C to a longitudinally extending zone maintained at 92 ° C, extended 3.0 times in the longitudinal direction, and cooled by a roll of 25 ° C. Next, both ends of the film were held by a clip while passing through a preheating zone of 115 ° C, and guided to a laterally extending region of 130 ° C, extending 3.6 times in the lateral direction. After that, it was continuously carried out in a tenter: heat treatment at 155 ° C for 10 seconds; heat fixation at 200 ° C for 10 seconds; heat at 155 ° C for 10 seconds Then, at a shrinkage rate of 2% and a shrinkage temperature of 130 ° C, the transverse direction is reduced, and then both ends of the film are cut, and the film is thermally relaxed at a longitudinal relaxation rate of 2.5%, and cooled to room temperature to obtain a thickness of 300 μm. Film. The evaluation results of the obtained film are shown in Table 2.

[實施例2-2~2-17、比較例2-1~2-6] [Examples 2-2 to 2-17, Comparative Examples 2-1 to 2-6]

除了將粒子及非相溶之樹脂之樣態、薄膜之構成以設定如表2所示以外，其餘與實施例2-1為相同操作而得到白色反射薄膜。將所得之薄膜之評價結果表示於表2。尚，使用的合成碳酸鈣粒子係藉由磷酸三甲酯來施予表面處理。 A white reflective film was obtained in the same manner as in Example 2-1 except that the particles and the incompatible resin and the composition of the film were set as shown in Table 2. The evaluation results of the obtained film are shown in Table 2. Further, the synthetic calcium carbonate particles used were subjected to surface treatment by trimethyl phosphate.

實施例2-17之薄膜之總厚度設為188μm。 The total thickness of the films of Examples 2-17 was set to 188 μm.

[實施例2-18] [Embodiment 2-18]

在與實施例2-1為相同操作而得到的雙軸延伸薄膜之單面上，使用直接凹版塗佈裝置，將由上述用來形成珠粒層的塗液1所示之組成而成的塗液以濕厚度為15g/m2的塗佈量進行塗佈，之後在烘箱內以100℃乾燥，得到具有珠粒層的白色反射薄膜。將所得之薄膜之評價結果表示於表2。尚，評價中將珠粒層側作為反射面使用。 On one side of the biaxially stretched film obtained in the same manner as in Example 2-1, a coating liquid composed of the above-mentioned coating liquid 1 for forming a bead layer was used using a direct gravure coating apparatus. Coating was carried out at a coating amount of a wet thickness of 15 g/m 2 , followed by drying at 100 ° C in an oven to obtain a white reflective film having a bead layer. The evaluation results of the obtained film are shown in Table 2. In addition, in the evaluation, the side of the bead layer was used as a reflecting surface.

[比較例2-7] [Comparative Example 2-7]

除了作為空孔形成劑為使用平均粒徑0.9μm、(D90-D10)/D50為1.4的硫酸鋇粒子來取代碳酸鈣粒子以外，其 餘與製造例3、4為相同操作來製作粒子母料切片，又，除了薄膜之構成如表2所示以外，其餘與實施例2-1為相同操作而得到白色反射薄。將所得之薄膜之評價結果表示於表2。尚，如此般之硫酸鋇粒子係藉由重複進行風力分級而得到。 In addition to replacing the calcium carbonate particles with barium sulfate particles having an average particle diameter of 0.9 μm and (D90-D10)/D50 of 1.4 as a pore-forming agent, The pellet masterbatch was prepared in the same manner as in Production Examples 3 and 4, and the white reflection was obtained in the same manner as in Example 2-1 except that the composition of the film was as shown in Table 2. The evaluation results of the obtained film are shown in Table 2. Still, such a barium sulfate particle is obtained by repeating the wind classification.

[實施例3-1] [Example 3-1] (白色反射薄膜之製造) (Manufacture of white reflective film)

分別採用上述得到的間苯二甲酸共聚合聚對苯二甲酸乙二酯1與粒子母料切片1作為反射層(A層)的原料、間苯二甲酸共聚合聚對苯二甲酸乙二酯2與粒子母料切片3作為表面層(C層)的原料，將分別之層以成為如表3記載之構成之方式進行混合，投入於擠壓機中，A層係以通過平均篩孔距30μm的不織布型濾器後以熔融擠壓溫度255℃，C層係以通過平均篩孔距50μm的不織布型濾器後以熔融擠壓溫度230℃，使用如表3所示般成為C層/A層/C層的層構成的3層供料頭裝置使該等合流，保持該層積狀態下藉由塑模成形為薄片狀。此時，使C層/A層/C層之厚度比在雙軸延伸後成為10/80/10之方式，以各擠壓機之吐出量來進行調整。進而，將該薄片以表面溫度25℃的冷卻滾筒予以冷卻固化，使成為未延伸薄膜。將該未延伸薄膜通過73℃的預熱區、然後75℃的預熱區，引導到保持92℃之縱延伸區，朝縱方向延伸3.0倍，用25℃的輥群予以冷卻。接著，將薄膜之兩端用夾子保持之同時使其通過115℃的預熱區，引導到保持130℃之橫延伸區，朝橫方向延伸3.6倍。之後在拉幅機內連續進行：155℃、10秒鐘的熱處理；200℃、10秒鐘的熱固定；155℃、10秒鐘的熱處理，然後在縮幅率2%、縮幅溫度130℃下進形橫方向之縮幅，接著切落薄膜兩端，以縱鬆 弛率2.5%進行熱鬆弛，冷卻到室溫為止，得到厚度300μm的薄膜。將所得之薄膜之評價結果表示於表3。 The isophthalic acid copolymerized polyethylene terephthalate 1 and the particle masterbatch 1 obtained as the raw material of the reflective layer (layer A) and the isophthalic acid copolymerized polyethylene terephthalate were respectively used. 2 and the particle masterbatch 3 as a raw material of the surface layer (C layer), and the respective layers are mixed so as to have the structure shown in Table 3, and are put in an extruder, and the A layer is passed through the average sieve pitch. The 30 μm non-woven filter was melted at a temperature of 255 ° C, and the C layer was passed through a non-woven filter having an average mesh opening distance of 50 μm, and then melt-extruded at a temperature of 230 ° C to form a C layer/A layer as shown in Table 3. The three-layer supply head device consisting of layers of the /C layer allows the joining to be carried out into a sheet shape by molding while maintaining the laminated state. At this time, the thickness ratio of the C layer/A layer/C layer was adjusted to be 10/80/10 after the biaxial stretching, and the amount of discharge of each extruder was adjusted. Further, the sheet was cooled and solidified by a cooling drum having a surface temperature of 25 ° C to form an unstretched film. The unstretched film was passed through a preheating zone of 73 ° C and then a preheating zone of 75 ° C to a longitudinally extending zone maintained at 92 ° C, extended 3.0 times in the longitudinal direction, and cooled by a roll of 25 ° C. Next, both ends of the film were held by a clip while passing through a preheating zone of 115 ° C, and guided to a laterally extending region of 130 ° C, extending 3.6 times in the lateral direction. Then, it was continuously carried out in a tenter: heat treatment at 155 ° C for 10 seconds; heat fixation at 200 ° C for 10 seconds; heat treatment at 155 ° C for 10 seconds, followed by a shrinkage rate of 2% and a shrinkage temperature of 130 ° C. The lowering of the transverse direction, then cutting the ends of the film to loosen The relaxation rate was 2.5%, and the film was cooled to room temperature to obtain a film having a thickness of 300 μm. The evaluation results of the obtained film are shown in Table 3.

[實施例3-2~3-15、比較例3-1~3-10] [Examples 3-2 to 3-15, Comparative Examples 3-1 to 3-10]

除了將粒子之樣態、薄膜之構成以設定如表3所示以外，其餘與實施例3-1為相同操作而得到白色反射薄膜。將所得之薄膜之評價結果表示於表3。尚，使用的合成碳酸鈣粒子係藉由磷酸三甲酯來施予表面處理。 A white reflective film was obtained in the same manner as in Example 3-1 except that the state of the particles and the composition of the film were set as shown in Table 3. The evaluation results of the obtained film are shown in Table 3. Further, the synthetic calcium carbonate particles used were subjected to surface treatment by trimethyl phosphate.

實施例3-10之薄膜之總厚度設為188μm。 The total thickness of the films of Examples 3-10 was set to 188 μm.

尚，使用於表面層C的各表面層粒子如同下述。與製造例5相同地使用作為粒子母料切片。 Further, the surface layer particles used for the surface layer C are as follows. The pellet master batch was used in the same manner as in Production Example 5.

粒子B：將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑5.0μm的粒子。 Particle B: AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 5.0 μm.

粒子C：將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑18.2μm的粒子。 Particle C: AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 18.2 μm.

粒子D：將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑35.3μm的粒子。 Particle D: AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 35.3 μm.

粒子E：將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑1.0μm的粒子。 Particle E: AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 1.0 μm.

粒子F：將Tosoh Silica(股)製AY-601(此係凝集矽石)以風力分級使成為平均粒徑52.0μm的粒子。 Particle F: AY-601 (this agglomerated vermiculite) manufactured by Tosoh Silica Co., Ltd. was subjected to wind classification to obtain particles having an average particle diameter of 52.0 μm.

[比較例3-11] [Comparative Example 3-11]

除了作為空孔形成劑為使用平均粒徑0.9μm、(D90- D10)/D50為1.4的硫酸鋇粒子來取代碳酸鈣粒子以外，其餘與製造例3為相同操作來製作粒子母料切片，又，除了薄膜之構成如表3所示以外，其餘與實施例3-1為相同操作而得到白色反射薄。將所得之薄膜之評價結果表示於表3。尚，如此般之硫酸鋇粒子係藉由重複進行風力分級而得到。 In addition to being used as a pore former, the average particle diameter is 0.9 μm, (D90- The particle master batch was prepared in the same manner as in Production Example 3 except that the barium sulfate particles of D10)/D50 were replaced by the barium sulfate particles of 1.4, and the composition of the film was as shown in Table 3 except for the structure of the film. -1 gives a white reflection thin for the same operation. The evaluation results of the obtained film are shown in Table 3. Still, such a barium sulfate particle is obtained by repeating the wind classification.

[產業利用性] [Industry Utilization]

本發明的白色反射薄膜為具有優異的反射特性之同時即使是使用於大型顯示器，亦可抑制來自於電氣電路或光源所產生的熱量、或來自於使用環境的熱量或濕度所造成的熱撓曲。藉此，可抑制因白色反射薄膜撓曲所產生的輝度斑，故產業上之利用性為高。 The white reflective film of the present invention has excellent reflection characteristics while suppressing heat deflection from heat generated by an electric circuit or a light source or heat or humidity from a use environment even when used in a large display. . Thereby, the luminance spot caused by the deflection of the white reflective film can be suppressed, so that the industrial applicability is high.

1‧‧‧底架 1‧‧‧ Chassis

2‧‧‧白色反射薄膜、導光板、光學薄片之層積物 2‧‧‧Layer of white reflective film, light guide plate and optical sheet

3‧‧‧正三角形型式之台 3‧‧‧Front triangle type

4‧‧‧重物 4‧‧‧ Heavy objects

Claims (9)

一種大型顯示器用白色反射薄膜，其係具有反射層A之白色反射薄膜，其特徵為：前述反射層A滿足下述a或b之任一者，a.由熱塑性樹脂A中為含有碳酸鈣粒子的熱塑性樹脂組成物A1所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A1之質量為10質量%以上、70質量%以下；b.由熱塑性樹脂A中為含有碳酸鈣粒子及對該熱塑性樹脂A非相溶之樹脂的熱塑性樹脂組成物A2所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A2之質量為5質量%以上、69質量%以下，該非相溶之樹脂之含量對前述熱塑性樹脂組成物A2之質量為1質量%以上、40質量%以下，前述碳酸鈣粒子與前述非相溶之樹脂之合計含量對前述熱塑性樹脂組成物A2之質量為10質量%以上、70質量%以下，前述碳酸鈣粒子之平均粒徑為0.1μm以上、1.2μm以下，從小粒徑側起累計而得的10%體積粒徑D10、50%體積粒徑D50及90%體積粒徑D90滿足(D90-D10)/D50≦1.6，薄膜之反射率為60%以上。 A white reflective film for a large-sized display, which is a white reflective film having a reflective layer A, characterized in that the reflective layer A satisfies any of the following a or b, a. contains a calcium carbonate particle from the thermoplastic resin A. a thermoplastic resin composition A1, the content of the calcium carbonate particles being 10% by mass or more and 70% by mass or less based on the mass of the thermoplastic resin composition A1; b. containing the calcium carbonate particles from the thermoplastic resin A and The thermoplastic resin composition A2 is a thermoplastic resin composition A2 which is a non-coherent resin, and the content of the calcium carbonate particles is 5% by mass or more and 69% by mass or less based on the mass of the thermoplastic resin composition A2, and the content of the non-compatible resin is The mass of the thermoplastic resin composition A2 is 1% by mass or more and 40% by mass or less, and the total content of the calcium carbonate particles and the incompatible resin is 10% by mass or more and 70% by mass of the thermoplastic resin composition A2. In the mass% or less, the average particle diameter of the calcium carbonate particles is 0.1 μm or more and 1.2 μm or less, and the 10% by volume particle diameter D10, 50% by volume particle diameter D50, and 90% by volume accumulated from the small particle diameter side. Satisfies diameter D90 (D90-D10) /D50≦1.6, a reflectance of 60% or more of the film. 如請求項1之白色反射薄膜，其中，上述反射層A為a.由熱塑性樹脂A中為含有碳酸鈣粒子的熱塑性樹脂組成物A1所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A1之質量為10質量%以上、70質量%以下。 The white reflective film of claim 1, wherein the reflective layer A is a. The thermoplastic resin A is formed of a thermoplastic resin composition A1 containing calcium carbonate particles, and the content of the calcium carbonate particles is opposite to the thermoplastic resin composition A1. The mass is 10% by mass or more and 70% by mass or less. 如請求項1之白色反射薄膜，其中，上述反射層A為b.由熱塑性樹脂A中為含有碳酸鈣粒子及對該熱塑性樹脂A非相溶之樹脂的熱塑性樹脂組成物A2所成，該碳酸鈣粒子之含量對前述熱塑性樹脂組成物A2之質量為5質量%以上、69質量%以下，該非相溶之樹脂之含量對前述熱塑性樹脂組成物A2之質量為1質量%以上、40質量%以下，前述碳酸鈣粒子與前述非相溶之樹脂之合計含量對前述熱塑性樹脂組成物A2之質量為10質量%以上、70質量%以下。 The white reflective film of claim 1, wherein the reflective layer A is b. The thermoplastic resin A is a thermoplastic resin composition A2 containing calcium carbonate particles and a resin which is incompatible with the thermoplastic resin A, the carbonic acid The content of the calcium resin is 5% by mass or more and 69% by mass or less based on the mass of the thermoplastic resin composition A2, and the content of the non-compatible resin is 1% by mass or more and 40% by mass or less based on the mass of the thermoplastic resin composition A2. The total content of the calcium carbonate particles and the incompatible resin is 10% by mass or more and 70% by mass or less based on the mass of the thermoplastic resin composition A2. 如請求項1~3中任一項之大型顯示器用白色反射薄膜，其中，具有上述反射層A、與進而於至少一側之表面的表面層C，前述表面層C由含有表面層粒子之熱塑性樹脂組成物C所成，該表面層粒子之平均粒徑為2.0μm以上、50.0μm以下，該表面層粒子之含量對該熱塑性樹脂組成物C之體積為3體積%以上、50體積%以下。 The white reflective film for a large display according to any one of claims 1 to 3, wherein the surface layer C having the reflective layer A and the surface of at least one side, the surface layer C is made of a thermoplastic containing surface layer particles. In the resin composition C, the average particle diameter of the surface layer particles is 2.0 μm or more and 50.0 μm or less, and the content of the surface layer particles is 3% by volume or more and 50% by volume or less based on the volume of the thermoplastic resin composition C. 如請求項1~4中任一項之白色反射薄膜，其中，上述熱塑性樹脂A為共聚合聚對苯二甲酸乙二酯。 The white reflective film according to any one of claims 1 to 4, wherein the thermoplastic resin A is a copolymerized polyethylene terephthalate. 如請求項5之白色反射薄膜，其中，上述共聚合聚對苯二甲酸乙二酯之共聚合量對該共聚合聚對苯二甲酸乙二酯之全酸成分100莫耳%為1莫耳%以上、20莫耳%以下。 The white reflective film of claim 5, wherein the copolymerization amount of the above copolymerized polyethylene terephthalate is 100 mol% of the total acid component of the copolymerized polyethylene terephthalate to 1 mol. More than %, 20% or less. 如請求項1~6中任一項之白色反射薄膜，其中，上述反射層A對白色反射薄膜之厚度100%之厚度比率為 50%以上。 The white reflective film according to any one of claims 1 to 6, wherein a thickness ratio of the reflective layer A to the thickness of the white reflective film of 100% is above 50. 如請求項1~7中任一項之白色反射薄膜，其中，進而含有由熱塑性樹脂B或熱塑性樹脂組成物B所成的支撐層B。 The white reflective film according to any one of claims 1 to 7, further comprising a support layer B made of a thermoplastic resin B or a thermoplastic resin composition B. 一種面光源，其特徵係使用請求項1~8中任一項之白色反射薄膜。 A surface light source characterized by using the white reflective film of any one of claims 1 to 8.
TW105122430A 2015-07-16 2016-07-15 White reflective film for large displays TWI772267B (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2015-142209 2015-07-16
JP2015142209A JP2017026676A (en) 2015-07-16 2015-07-16 White reflective film for large-sized display
JP2015167587A JP2017044886A (en) 2015-08-27 2015-08-27 White reflective film for large display
JP2015-167587 2015-08-27
JP2016-077384 2016-04-07
JP2016077384A JP6837285B2 (en) 2016-04-07 2016-04-07 White reflective film for large displays

Publications (2)

Publication Number Publication Date
TW201708338A true TW201708338A (en) 2017-03-01
TWI772267B TWI772267B (en) 2022-08-01

Family

ID=57757406

Family Applications (1)

Application Number Title Priority Date Filing Date
TW105122430A TWI772267B (en) 2015-07-16 2016-07-15 White reflective film for large displays

Country Status (4)

Country Link
KR (1) KR20180030855A (en)
CN (1) CN107710032B (en)
TW (1) TWI772267B (en)
WO (1) WO2017010471A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110941039B (en) * 2018-09-25 2021-04-30 深圳光峰科技股份有限公司 Light reflecting material, reflecting layer and preparation method thereof
DE102019123660A1 (en) * 2019-09-04 2021-03-04 HELLA GmbH & Co. KGaA LIGHT OF A VEHICLE WITH A LENS
CN114114489A (en) * 2021-12-02 2022-03-01 宁波长阳科技股份有限公司 Polyester reflecting film, preparation method and application thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4548430B2 (en) * 2006-03-02 2010-09-22 東レ株式会社 White laminated polyester film for reflector
JP4971690B2 (en) * 2006-06-02 2012-07-11 帝人デュポンフィルム株式会社 Biaxially stretched film
JP4782617B2 (en) * 2006-06-08 2011-09-28 帝人デュポンフィルム株式会社 Polyester laminated film roll
JP5722937B2 (en) * 2013-02-25 2015-05-27 帝人デュポンフィルム株式会社 White reflective film
WO2014129673A1 (en) * 2013-02-25 2014-08-28 帝人デュポンフィルム株式会社 White reflective film
JP6219673B2 (en) * 2013-10-28 2017-10-25 帝人フィルムソリューション株式会社 White polyester film
JP6174453B2 (en) * 2013-10-28 2017-08-02 帝人フィルムソリューション株式会社 White polyester film
JP6356405B2 (en) * 2013-10-28 2018-07-11 帝人フィルムソリューション株式会社 White polyester film

Also Published As

Publication number Publication date
CN107710032B (en) 2020-12-15
CN107710032A (en) 2018-02-16
KR20180030855A (en) 2018-03-26
WO2017010471A1 (en) 2017-01-19
TWI772267B (en) 2022-08-01

Similar Documents

Publication Publication Date Title
JP6174453B2 (en) White polyester film
TWI488743B (en) Reflector with white film
JP5985809B2 (en) Polyester film for reflector
JP6356405B2 (en) White polyester film
JP5596404B2 (en) Polyester film for reflector
JP6219673B2 (en) White polyester film
JP5985808B2 (en) Polyester film for reflector
JP5502379B2 (en) White reflective film
WO2005123385A1 (en) Laminated film for reflection plate
TWI772267B (en) White reflective film for large displays
JP2020109515A (en) White reflective film for large-sized display
JP6356447B2 (en) White polyester film
JP6837285B2 (en) White reflective film for large displays
KR20120044957A (en) Polyester resin composition and white film made of it
JP6490891B2 (en) White reflective film for direct surface light source
TWI684794B (en) White reflective film for direct-type surface light source and direct-type surface light source using the same
JP6336308B2 (en) White reflective film for direct surface light source
JP2020073992A (en) White reflective film for large-sized display
JP2017044886A (en) White reflective film for large display
KR102001118B1 (en) MULTILAYERED WHITE POLYESTER FILM FOR REFLECTOR of LCD UNIT
JP2017026676A (en) White reflective film for large-sized display
JP5702482B2 (en) White reflective film
JP5495345B2 (en) White reflective film
KR20120034696A (en) White polyester film for reflection plate and plane lighting unit made of it
JP2014043488A (en) White film