JPH11158305A - Porous film and its production - Google Patents
Porous film and its productionInfo
- Publication number
- JPH11158305A JPH11158305A JP27124898A JP27124898A JPH11158305A JP H11158305 A JPH11158305 A JP H11158305A JP 27124898 A JP27124898 A JP 27124898A JP 27124898 A JP27124898 A JP 27124898A JP H11158305 A JPH11158305 A JP H11158305A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- film
- acid amide
- density
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、多孔性フィルム及
びその製造方法に関する。詳しくは、透湿度が従来品と
同レベルにあり、しかも、優れた厚みの均一性と接着性
を有し、シミ出し特性が良好であり、且つ、柔軟性に富
んで風合いの良い多孔性フィルム及びその製造方法に関
する。[0001] The present invention relates to a porous film and a method for producing the same. More specifically, a porous film that has the same level of moisture permeability as conventional products, has excellent thickness uniformity and adhesiveness, has good spotting properties, and has good flexibility and good texture. And its manufacturing method.
【0002】[0002]
【従来の技術】従来、ポリオレフィン樹脂および無機充
填剤を含むフィルムを一軸方向または二軸方向に延伸
し、フィルムに連通したボイドを発生させて多孔性フィ
ルムを製造する方法が多数提案されている。そして、こ
の多孔性フィルムは衛生材料、医療用材料、建築用材
料、電池セパレーター等の多種用途に使用されている。2. Description of the Related Art Hitherto, many methods have been proposed for producing a porous film by stretching a film containing a polyolefin resin and an inorganic filler in a uniaxial or biaxial direction to generate voids communicating with the film. This porous film is used for various purposes such as sanitary materials, medical materials, building materials, battery separators, and the like.
【0003】フィルムを延伸してボイドを発生させる
際、延伸倍率を高くし過ぎると、樹脂の分子配向が大き
くなるためにフィルムの剛性が大きくなり、フィルムの
ソフト感が損なわれる。一方、延伸倍率を低くし過ぎる
と、延伸開始時に発生する局部的なネッキング現象がフ
ィルムに残り、厚みの均一性が低下してフィルムに斑模
様ができるという問題がある。かかる現象は、フィルム
厚みが薄くなると一層顕著に現れる傾向がある。[0003] When a film is stretched to generate voids, if the stretching ratio is too high, the molecular orientation of the resin is increased, so that the rigidity of the film is increased and the softness of the film is impaired. On the other hand, if the stretching ratio is too low, a local necking phenomenon that occurs at the start of stretching remains in the film, causing a problem that the uniformity of the thickness is reduced and a mottle pattern is formed on the film. Such a phenomenon tends to appear more conspicuously as the film thickness decreases.
【0004】また、多孔性フィルムを使い捨ておむつの
資材として用いた場合、人尿等は洩らさず、湿気のみを
通す性能が求められている。使い捨ておむつに用いられ
る吸水ポリマーによっては、吸い込んだ人尿に微量の界
面活性剤が溶け出すものもあるが、そうした場合、多孔
性フィルムから人尿がシミ出し易くなる。In addition, when a porous film is used as a material for disposable diapers, it is required that the urine and the like do not leak and that only moisture can pass therethrough. Depending on the water-absorbing polymer used in disposable diapers, a small amount of a surfactant may dissolve into the human urine inhaled, but in such a case, human urine tends to stain from the porous film.
【0005】また、止着テープ等の接着テープのフィル
ムへの接着性が良好であることも求められてきている。
例えば、接着性の悪い多孔性フィルムを使い捨て紙オム
ツのバックシートとして使用した場合、使い捨て紙オム
ツを人体に装着する際に止着テープ等で固定することが
困難であり、人尿等が漏洩する原因となる。[0005] It is also required that adhesive tapes such as fastening tapes have good adhesiveness to films.
For example, when a porous film having poor adhesiveness is used as a backsheet of a disposable diaper, it is difficult to fix the disposable diaper with a fastening tape or the like when attaching the disposable diaper to a human body, and human urine and the like leak. Cause.
【0006】かかる問題を解決する手段として、例え
ば、特開昭62−250038号公報には、第三成分と
して脂肪酸アミド、流動パラフィン、ソルビタン脂肪酸
エステルの少なくとも1種を添加することを提案されて
いる。そして、第三成分の好ましい例としてオレイン酸
アミド、ステアリン酸アミド等が例示されている。しか
し、本発明者らの知見によれば、オレイン酸アミド、ス
テアリン酸アミド等を用いた場合、柔軟性の付与には効
果が認められるものの、フィルム厚みの均一性、通気
性、接着性、シミだし特性のバランスのとれたフィルム
は得られない。As means for solving such a problem, for example, Japanese Patent Application Laid-Open No. 62-250038 proposes to add at least one of fatty acid amide, liquid paraffin and sorbitan fatty acid ester as a third component. . Oleic acid amide, stearic acid amide and the like are exemplified as preferred examples of the third component. However, according to the knowledge of the present inventors, when oleic acid amide, stearic acid amide, or the like is used, although an effect is imparted to impart flexibility, uniformity of film thickness, air permeability, adhesiveness, and stains are observed. However, a film with balanced properties cannot be obtained.
【0007】また、特公平5−35734号公報には、
第三成分としてヒマシ油を用いることが提案されてい
る。しかし、通気性、柔軟性、フィルム厚みの均一性の
付与には効果が認めれるものの、接着性やシミだし特性
が満足できるものでない。上記のように、従来、優れた
シミ出し特性及び接着性を有し、且つ、通気性、厚み均
一性及び風合いの良さ等の諸特性をバランス良く保持し
た多孔性フィルムが得られていないのである。Further, Japanese Patent Publication No. 5-35734 discloses that
It has been proposed to use castor oil as the third component. However, although an effect is recognized in imparting air permeability, flexibility, and uniformity of film thickness, adhesiveness and spotting characteristics are not satisfactory. As described above, heretofore, a porous film having excellent spotting properties and adhesiveness, and maintaining various properties such as air permeability, thickness uniformity and good texture in a well-balanced manner has not been obtained. .
【0008】[0008]
【発明が解決しようとする課題】本発明の目的は、上記
問題に鑑み、透湿度が従来品と同レベルにあり、しか
も、優れた厚みの均一性と接着性を有し、シミ出し特性
が良好であり、且つ、柔軟性に富んで風合いの良い多孔
性フィルム、及びその製造方法を提供することにある。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to have the same level of moisture permeability as that of a conventional product, and to have excellent thickness uniformity and adhesiveness, and to obtain a stain-out property. It is an object of the present invention to provide a porous film which is good, has good flexibility and good texture, and a method for producing the same.
【0009】[0009]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意検討した結果、線型低密度ポリエ
チレンと分岐状低密度ポリエチレンとを特定の割合で含
むポリエチレン系樹脂に対し、特定量の無機充填剤を添
加して樹脂組成物となし、さらに、該組成物に対し、エ
チレンビスステアリン酸アミド、メチレンビスステアリ
ン酸アミド及びエチレンビスオレイン酸アミドの少なく
とも1種の特定量を添加することにより、上記課題が解
決された多孔性フィルムが得られることを見出し、本発
明に到った。Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, a polyethylene-based resin containing a linear low-density polyethylene and a branched low-density polyethylene in a specific ratio has been developed. A specific amount of an inorganic filler is added to form a resin composition, and further, at least one specific amount of ethylenebisstearic acid amide, methylenebisstearic acid amide and ethylenebisoleic acid amide is added to the composition. As a result, they have found that a porous film in which the above-mentioned problems have been solved can be obtained, and have reached the present invention.
【0010】すなわち、本発明は、メルトインデックス
0.5〜5g/10分、密度0.910〜0.940g
/cm3の線型低密度ポリエチレン75〜98重量%、
及び、メルトインデックス0.1〜2g/10分、密度
0.915〜0.924g/cm3の分岐状低密度ポリ
エチレン2〜25重量%を含むポリエチレン系樹脂
(A)25〜50重量部、並びに、無機充填剤(B)7
5〜50重量部を含み、且つ、(A)及び(B)100
重量部に対してエチレンビスステアリン酸アミド、メチ
レンビスステアリン酸アミド及びメチレンビスオレイン
酸アミドから選ばれた少なくとも1種の化合物0.5〜
10重量部を含むことを特徴とする多孔性フィルム、及
び、該多孔性フィルムの製造方法である。That is, the present invention provides a melt index of 0.5 to 5 g / 10 minutes and a density of 0.910 to 0.940 g.
/ Cm 3 linear low density polyethylene 75-98% by weight,
And 25 to 50 parts by weight of a polyethylene resin (A) containing 2 to 25% by weight of a branched low-density polyethylene having a melt index of 0.1 to 2 g / 10 minutes and a density of 0.915 to 0.924 g / cm 3 ; , Inorganic filler (B) 7
5 to 50 parts by weight, and (A) and (B) 100
At least one compound selected from the group consisting of ethylene bisstearic acid amide, methylene bisstearic acid amide and methylene bisoleic acid amide with respect to parts by weight;
A porous film comprising 10 parts by weight, and a method for producing the porous film.
【0011】本発明によれば、透湿度が従来品と同レベ
ルに維持し、しかも、優れた厚みの均一性と接着性を有
し、シミ出し特性が良好であり、且つ、柔軟性に富んで
風合いの良い多孔性フィルムが得られる。そのため、本
発明の多孔性フィルムは、衛生材料、医療用材料、建築
用材料、電池セパレーター等の用途に広く使用すること
ができる。特に、使い捨ておむつのバックシートとして
好適に使用することができる。According to the present invention, the moisture permeability is maintained at the same level as that of the conventional product, and furthermore, it has excellent thickness uniformity and adhesiveness, has good spotting properties, and is highly flexible. And a porous film having a good texture can be obtained. Therefore, the porous film of the present invention can be widely used for applications such as sanitary materials, medical materials, building materials, battery separators, and the like. In particular, it can be suitably used as a backsheet of a disposable diaper.
【0012】[0012]
【発明の実施の形態】以下、本発明について詳細に説明
する。本発明の多孔性フィルムは、特定のポリエチレン
系樹脂25〜50重量部と無機充填剤75〜50重量部
とを混合して樹脂組成物となし、さらに、該樹脂組成物
100重量部に対して、エチレンビスステアリン酸アミ
ド、メチレンビスステアリン酸アミド及びエチレンビス
オレイン酸アミドから選ばれた少なくとも1種の化合物
0.5〜10重量部を添加し、それを混練、溶融してフ
ィルム状に成形し、次いで、得られたフィルムを少なく
とも一軸方向に延伸することにより製造される。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The porous film of the present invention is obtained by mixing 25 to 50 parts by weight of a specific polyethylene resin and 75 to 50 parts by weight of an inorganic filler to form a resin composition, and further based on 100 parts by weight of the resin composition. , 0.5 to 10 parts by weight of at least one compound selected from ethylene bisstearic acid amide, methylene bisstearic acid amide and ethylene bisoleic acid amide, kneaded, melted and formed into a film. Then, it is manufactured by stretching the obtained film at least uniaxially.
【0013】本発明に用いるポリエチレン系樹脂は、特
定の線型低密度ポリエチレンと分岐状低密度ポリエチレ
ンとを混合して用いる。線型低密度ポリエチレンは、炭
素数が3〜8の分子骨格であるα−オレフィンとエチレ
ンとの共重合体である。線型低密度ポリエチレンとして
は、密度が0.910〜0.940g/cm3、メルト
インデックスが0.5〜5g/10分のものである。密
度が0.910g/cm3未満になると均一延伸性が低
下し、0.940g/cm3を超えると延伸フィルムの
ソフト感が損なわれる。また、メルトインデックスが
0.5g/10分未満になるとフィルムを押し出すとき
に異常流動により厚みが均一なフィルムを得ることが難
しくなり、5g/10分を超えると均一延伸性が悪化す
る。The polyethylene resin used in the present invention is a mixture of a specific linear low-density polyethylene and a branched low-density polyethylene. Linear low-density polyethylene is a copolymer of α-olefin having a molecular skeleton having 3 to 8 carbon atoms and ethylene. The linear low-density polyethylene has a density of 0.910 to 0.940 g / cm 3 and a melt index of 0.5 to 5 g / 10 minutes. If the density is less than 0.910 g / cm 3 , the uniform stretchability decreases, and if it exceeds 0.940 g / cm 3 , the softness of the stretched film is impaired. When the melt index is less than 0.5 g / 10 minutes, it is difficult to obtain a film having a uniform thickness due to abnormal flow when extruding the film, and when it exceeds 5 g / 10 minutes, the uniform stretchability is deteriorated.
【0014】分岐状低密度ポリエチレンは、エチレンを
公知の高圧法で重合させることによって得られるもの
で、メルトインデックスが0.1〜2g/10分、密度
が0.915〜0.925g/cm3のものである。メ
ルトインデックスが0.1g/10分未満になると前者
の線型低密度ポリエチレンと混ざり合いが悪くなり、2
g/10分を超えると均一厚みのフィルムが得られなく
なる。また、密度が0.924を超えると均一厚みのフ
ィルムが得られなくなる。The branched low-density polyethylene is obtained by polymerizing ethylene by a known high-pressure method, and has a melt index of 0.1 to 2 g / 10 min and a density of 0.915 to 0.925 g / cm 3. belongs to. When the melt index is less than 0.1 g / 10 minutes, the mixing with the former linear low-density polyethylene becomes poor, and
If it exceeds g / 10 minutes, a film having a uniform thickness cannot be obtained. When the density exceeds 0.924, a film having a uniform thickness cannot be obtained.
【0015】本発明においては、ポリエチレン系樹脂と
して、線型低密度ポリエチレン75〜98重量%、好ま
しくは85〜96重量%と、分岐状低密度ポリエチレン
25〜2重量%、好ましくは15〜4重量%との混合物
を用いる。分岐状低密度ポリエチレンが25重量%を超
えると、溶融状態でのフィルムの伸びがなくなり、フィ
ルムに加工することが難しくなる。一方、2重量%未満
では均一厚みのフィルムを得ることが難しくなる。In the present invention, as the polyethylene resin, 75 to 98% by weight, preferably 85 to 96% by weight of linear low density polyethylene, 25 to 2% by weight, preferably 15 to 4% by weight of branched low density polyethylene Use a mixture with If the amount of the branched low-density polyethylene exceeds 25% by weight, the film does not elongate in a molten state, and it is difficult to process the film into a film. On the other hand, if it is less than 2% by weight, it is difficult to obtain a film having a uniform thickness.
【0016】無機充填剤としては、例えば、炭酸カルシ
ウム、硫酸バリウム、硫酸カルシウム、炭酸バリウム、
水酸化マグネシウム、水酸化アルミニウム、酸化亜鉛、
酸化マグネシウム、酸化チタン、シリカ、タルク等が挙
げられる。これらのうち、炭酸カルシウム及び硫酸バリ
ウムが特に好ましい。無機充填剤の平均粒径は20μm
以下のものが好ましい。更に好ましくは10μm以下で
あり、0.5〜5μmのものが最も好ましい。また、無
機充填剤は、樹脂との分散性を向上させるために表面処
理が施されたものが好ましい。表面処理剤としては、無
機充填剤の表面を被覆することにより、その表面を疎水
化できるものが好ましく、例えば、ステアリン酸、ラウ
リン酸等の高級脂肪酸またはそれらの金属塩等を挙げる
ことができる。Examples of the inorganic filler include calcium carbonate, barium sulfate, calcium sulfate, barium carbonate,
Magnesium hydroxide, aluminum hydroxide, zinc oxide,
Examples include magnesium oxide, titanium oxide, silica, and talc. Of these, calcium carbonate and barium sulfate are particularly preferred. The average particle size of the inorganic filler is 20 μm
The following are preferred. It is more preferably 10 μm or less, and most preferably 0.5 to 5 μm. The inorganic filler is preferably subjected to a surface treatment in order to improve the dispersibility with the resin. As the surface treatment agent, those capable of rendering the surface hydrophobic by coating the surface of the inorganic filler are preferable, and examples thereof include higher fatty acids such as stearic acid and lauric acid, and metal salts thereof.
【0017】前記ポリエチレン系樹脂と無機充填剤との
組成比は、前記ポリエチレン系樹脂が25〜50重量
部、好ましくは35〜45重量部に対し、無機充填剤が
75〜50重量部、好ましくは65〜55重量部の範囲
である。無機充填剤が50重量部未満になると、ポリエ
チレン系樹脂と無機充填剤との界面が剥離してできる隣
接したボイドどうしが連通しなくなり、通気性が得られ
なくなる。また、75重量部を超えると、フィルムの延
伸時の伸びがなくなり、延伸が困難になる。The composition ratio of the polyethylene resin and the inorganic filler is such that the polyethylene resin is 25 to 50 parts by weight, preferably 35 to 45 parts by weight, and the inorganic filler is 75 to 50 parts by weight, preferably It is in the range of 65 to 55 parts by weight. When the amount of the inorganic filler is less than 50 parts by weight, adjacent voids formed by peeling off the interface between the polyethylene-based resin and the inorganic filler are not communicated with each other, and air permeability cannot be obtained. On the other hand, if it exceeds 75 parts by weight, elongation during stretching of the film is lost, and stretching becomes difficult.
【0018】本発明の多孔性フィルムは、線型低密度ポ
リエチレンと特定の分岐状低密度ポリエチレンを含むポ
リエチレン系樹脂、及び無機充填剤を含む樹脂組成物
に、更に第三成分として、エチレンビスステアリン酸ア
ミド、メチレンビスステアリン酸アミド及びエチレンビ
スオレイン酸アミドの少なくとも1種を特定量含むこと
に特徴がある。The porous film of the present invention comprises a polyethylene resin containing a linear low-density polyethylene and a specific branched low-density polyethylene, a resin composition containing an inorganic filler, and ethylene bisstearic acid as a third component. It is characterized in that it contains a specific amount of at least one of amide, methylenebisstearic acid amide and ethylenebisoleic acid amide.
【0019】エチレンビスステアリン酸アミド、メチレ
ンビスステアリン酸アミド、エチレンビスオレイン酸ア
ミド、またはこれらの混合物の添加量は、フィルムの厚
みの均一性、延伸性、フィルムの風合い、フィルムの成
形性、フィルムの接着性などに影響を及ぼす。添加量が
多すぎると、これらがフィルムからブリードアウトし、
接着性が悪くなる。また、添加量が少なすぎると、フィ
ルムが硬くなり風合いが悪くなり、厚み均一性も悪くな
る。かかる点を考慮すると、上記ポリエチレン系樹脂及
び無機充填剤の合計量100重量部に対し、0.5〜1
0重量部が好ましい。The addition amount of ethylenebisstearic acid amide, methylenebisstearic acid amide, ethylenebisoleic acid amide, or a mixture thereof depends on the film thickness uniformity, stretchability, film texture, film moldability, film formability, Affects the adhesiveness of the rubber. If they are added too much, they will bleed out of the film,
Poor adhesion. On the other hand, if the addition amount is too small, the film becomes hard, the texture becomes poor, and the thickness uniformity also becomes poor. Considering this point, 0.5 to 1 with respect to 100 parts by weight of the total amount of the polyethylene resin and the inorganic filler.
0 parts by weight is preferred.
【0020】本発明の多孔性フィルムには、上記の他に
一般に樹脂組成物用として用いられている添加物、例え
ば、酸化防止剤、熱安定剤、光安定剤、紫外線吸収剤、
中和剤、防曇剤、アンチブロッキング剤、帯電防止剤、
スリップ剤、着色剤等を配合してもよい。In the porous film of the present invention, in addition to the above, additives generally used for resin compositions, such as antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers,
Neutralizing agent, antifogging agent, antiblocking agent, antistatic agent,
You may mix | blend a slipping agent, a coloring agent, etc.
【0021】本発明の多孔性フィルムは、例えば、上記
ポリエチレン系樹脂、及び、無機充填剤、並びに、エチ
レンビスステアリン酸アミド、メチレンビスステアリン
酸アミド及びエチレンビスオレイン酸アミドの少なくと
も1種、必要に応じて、その他の添加剤をヘンシェルミ
キサー、スーパーミキサー、タンブラー型ミキサー等を
用いて混合した後、一軸あるいは2軸押出機、ニーダー
等で加熱混練し、ペレット化する。次いで、そのペレッ
トをポリエチレン樹脂の融点以上、好ましくは融点+2
0℃以上、分解温度未満の温度において、Tダイ等が装
着された押出成形機、円形ダイが装着されたインフレー
ション成形機等の公知の成形機を用いて、溶融、製膜す
る。場合によっては、ペレット化せず直接成形機で製膜
することも出来る。[0021] The porous film of the present invention comprises, for example, the above-mentioned polyethylene resin, an inorganic filler, and at least one of ethylenebisstearic acid amide, methylenebisstearic acid amide and ethylenebisoleic acid amide. Accordingly, other additives are mixed using a Henschel mixer, a super mixer, a tumbler type mixer, or the like, and then heated and kneaded with a single-screw or twin-screw extruder, a kneader, or the like, and pelletized. Next, the pellet is melted at a temperature equal to or higher than the melting point of the polyethylene resin, preferably at a melting point +2.
At a temperature of 0 ° C. or higher and lower than the decomposition temperature, melting and film formation are performed by using a known molding machine such as an extruder equipped with a T-die and an inflation molding machine equipped with a circular die. In some cases, it is also possible to form a film directly on a molding machine without pelletizing.
【0022】製膜されたフィルムは、ロール法、テンタ
ー法等の公知の方法により、室温〜樹脂の軟化点(JI
S K−6760に規定される方法により測定した値)
において、少なくとも一軸方向に延伸を行ない、ポリエ
チレン系樹脂と無機充填剤との界面剥離を起こさせるこ
とにより多孔性フィルムを製造する。The formed film is formed at room temperature to the softening point of the resin (JI) by a known method such as a roll method or a tenter method.
(Value measured by the method specified in SK-6760)
In the above, a porous film is produced by stretching at least in a uniaxial direction to cause interfacial separation between the polyethylene resin and the inorganic filler.
【0023】延伸は、一段で行ってもよいし、多段階に
分けて行ってもよい。延伸倍率は、延伸時のフィルムの
破れ、得られるフィルムの通気性、フィルムのソフト感
等に関係するので、倍率が高すぎても低すぎても好まし
くない。かかる観点から、本発明における延伸倍率は
1.2〜5倍、好ましくは1.5〜3倍である。2軸延
伸する場合は、最初に機械方向、またはそれと直角をな
す方向に1軸延伸し、次いで、該方向と直角をなす方向
に2軸目の延伸を行う方法、及び、機械方向、およびそ
れと直角をなす方向に同時に2軸延伸する方法がある。
いずれの方法も適用できる。また、延伸した後、必要に
応じて、得られた開孔の形態を安定させるために熱固定
処理を行ってもよい。熱固定処理としては、樹脂の軟化
点〜融点未満の温度において、0.1〜100秒間熱処
理する方法が挙げられる。The stretching may be performed in one step or may be performed in multiple steps. Since the stretching ratio is related to the breaking of the film at the time of stretching, the air permeability of the obtained film, the soft feeling of the film, and the like, it is not preferable that the stretching ratio is too high or too low. From such a viewpoint, the stretching ratio in the present invention is 1.2 to 5 times, preferably 1.5 to 3 times. In the case of biaxial stretching, a method of first performing uniaxial stretching in a machine direction or a direction perpendicular to the machine direction, and then performing a second axis stretching in a direction perpendicular to the machine direction, and a machine direction, and There is a method in which biaxial stretching is performed at the same time in a direction at right angles.
Either method can be applied. After the stretching, a heat setting treatment may be performed, if necessary, in order to stabilize the form of the obtained opening. As the heat setting treatment, a method of performing heat treatment at a temperature lower than the softening point of the resin to a temperature lower than the melting point for 0.1 to 100 seconds may be used.
【0024】本発明の多孔性フィルムの厚みには特に制
限はないが、通常の厚みは10〜100μm程度であ
る。10μm未満ではフィルムが破れ易くなり、100
μmを超えるとフィルムが硬くなり、布様のソフト感、
良好な風合いを有する通気性フィルムとなり難いので好
ましくない。The thickness of the porous film of the present invention is not particularly limited, but is usually about 10 to 100 μm. If it is less than 10 μm, the film is easily broken,
When the thickness exceeds μm, the film becomes hard and soft like a cloth,
It is not preferable because it is difficult to form a breathable film having a good texture.
【0025】本発明によって製造される多孔性フィルム
の物性は、無機充填剤の充填割合、種類、粒径、分岐状
低密度ポリエチレンの配合割合、エチレンビスステアリ
ン酸アミド、メチレンビスステアリン酸アミド、エチレ
ンビスオレイン酸アミドの配合割合、延伸条件(延伸方
向、延伸倍率、延伸温度等)によって自由に変えること
ができる。フィルムの厚みが10〜100μmの範囲に
ある時は、JIS−Z0208(40℃、相対湿度90
%、CaCl2法の条件)に規定される方法で測定した
透湿度が1000〜20000g/m2・24hr)の
範囲にある。The physical properties of the porous film produced by the present invention are as follows: filling ratio of inorganic filler, kind, particle size, blending ratio of branched low-density polyethylene, ethylenebisstearic amide, methylenebisstearic amide, ethylene It can be freely changed depending on the blending ratio of bisoleic acid amide and stretching conditions (stretching direction, stretching ratio, stretching temperature, etc.). When the thickness of the film is in the range of 10 to 100 μm, JIS-Z0208 (40 ° C., relative humidity 90
%, The condition of the CaCl 2 method) is in the range of 1000 to 20000 g / m 2 · 24 hr).
【0026】かかる特性を有する多孔性フィルムは、適
度の通気性、透湿性、風合い、並びに優れた厚み均一
性、接着性、良好なシミ出し特性を有する。そのため、
使い捨て紙オムツ、体液吸収用パット、ベッドシーツ等
の衛生材料、手術衣、温湿布用基材等の医療用材料、ジ
ャンパー、雨着等の衣料用材料、壁紙、屋根防水材等の
建築用材料、乾燥剤、防湿剤、脱酸素剤、使い捨てカイ
ロ、鮮度保持包装、食品包装等の包装材、電池用セパレ
ーター等の資材として極めて好適に使用できる。The porous film having such properties has appropriate air permeability, moisture permeability, feeling, excellent thickness uniformity, adhesiveness, and good stain removal properties. for that reason,
Sanitary materials such as disposable paper diapers, pats for absorbing body fluids, bed sheets, medical materials such as surgical gowns, base materials for hot compresses, clothing materials such as jumpers and raincoats, wallpaper materials, and building materials such as roof waterproof materials It can be used very suitably as a desiccant, a desiccant, an oxygen scavenger, a disposable body warmer, a packaging material such as freshness preserving packaging, a food packaging, a battery separator and the like.
【0027】[0027]
【実施例】以下、本発明についてさらに具体的に説明す
るため、以下に実施例を示す。尚、本発明はこれらの実
施例に限定されるものではない。実施例に示したメルト
インデックス(以下、MIという)、透湿度、フィルム
厚みの均一性、柔軟性、経時後の接着強度、界面活性剤
水溶液のシミ出し開始時間等は、下記の方法により測定
した値である。The present invention will now be described more specifically with reference to the following examples. Note that the present invention is not limited to these examples. The melt index (hereinafter, referred to as MI), moisture permeability, uniformity of film thickness, flexibility, adhesive strength after aging, and the time to start bleeding of the surfactant aqueous solution shown in Examples were measured by the following methods. Value.
【0028】(1)MI(g/10分) ASTM D−1238−57T(E)に規定される方
法により、温度190℃、荷重2160gの条件で測定
する。 (2)透湿度(g/m2・24hr) 温度40℃、相対湿度90%において、JIS−Z02
08(CaCl2法)に規定される方法により測定す
る。 (3)フィルム厚みの均一性 多孔性フィルムから試料〔機械方向(以下、縦方向とい
う):101cm、機械方向と直角方向(以下、横方向
という):5cm〕を3枚採取し、縦方向に1cm間隔
で合計300箇所の測定点について、厚み測定機(PE
ACOCK社製、UPRIGHT DIAL GUAG
E NO.25)を用いて厚みを測定し、平均厚み
(X)、最高厚み(MAX)及び最低厚み(MIN)を
求め、〔(MAX)−(MIN)〕/(X)を算出し
て、これをフィルム厚みの均一性とする。(1) MI (g / 10 min) Measured at a temperature of 190 ° C. and a load of 2160 g by the method specified in ASTM D-1238-57T (E). (2) Moisture permeability (g / m 2 · 24 hr) JIS-Z02 at a temperature of 40 ° C. and a relative humidity of 90%
08 (CaCl 2 method). (3) Uniformity of film thickness Three samples (machine direction (hereinafter, referred to as vertical direction): 101 cm, direction perpendicular to the machine direction (hereinafter, referred to as horizontal direction): 5 cm) are sampled from the porous film, and are taken in the vertical direction. For a total of 300 measuring points at 1 cm intervals, use a thickness measuring machine (PE
ACOCK, UPLIGHT DIAL GUAG
E NO. 25), the average thickness (X), the maximum thickness (MAX), and the minimum thickness (MIN) are obtained, and [(MAX) − (MIN)] / (X) is calculated. Uniformity of film thickness.
【0029】(4)柔軟性 フィルムを手で触り、折り曲げなどして柔軟性、風合い
を評価する。評価基準は下記の通り。 1:フィルムを折り曲げてもカサカサ音がせず、感触が
大変柔らかいもの。 2:フィルムを折り曲げてもカサカサ音がせず、感触が
柔らかいもの。 3:フィルムを折り曲げてもカサカサ音はしないが、感
触がやや硬いもの。 4:フィルムを折り曲げるとややカサカサ音がし、感触
が硬いもの。 5:フィルムを折り曲げるとカサカサ音がひどく、感触
がかなり硬いもの。(4) Flexibility The flexibility and texture are evaluated by touching and bending the film. The evaluation criteria are as follows. 1: No rustling sound even when the film is bent, and the feel is very soft. 2: The film does not make a rustling sound even when the film is bent, and has a soft touch. 3: The film does not make a crunchy sound even when it is bent, but has a slightly hard feel. 4: When the film is bent, the film makes a slight rustling sound and has a hard feel. 5: When the film is bent, the sound is rustling and the feel is quite hard.
【0030】(5)経時後の接着強度(g/25mm) 多孔性フィルムの片表面に幅25mmのPPテープ〔東
洋化学(株)製、商品名:カラリアンPP、接着剤層
付〕を貼付して試料とし、この試料を60℃のオーブン
中に48時間放置した後、テンシロン引張試験機(東洋
ボールドウィン社製、商品名:テンシロン)を用いて、
PPテープを剥離する際の剥離応力をJIS−Z023
7に規定される180度引き剥がし法により測定する。(5) Adhesive strength after aging (g / 25 mm) A PP tape having a width of 25 mm [trade name: Calarian PP, with adhesive layer, manufactured by Toyo Chemical Co., Ltd.] is attached to one surface of the porous film. After leaving the sample in an oven at 60 ° C. for 48 hours, using a Tensilon tensile tester (trade name: Tensilon, manufactured by Toyo Baldwin Co., Ltd.)
The peeling stress when peeling the PP tape was measured according to JIS-Z023.
It is measured by the 180-degree peeling method specified in 7.
【0031】(6)界面活性剤水溶液のシミだし開始時
間、及び終了時間 縦横それぞれ10cmの正方形の多孔性フィルム試料を
準備する。予め、試料の中央部に直径5cmの円を描い
ておく。シミだし促進溶液として界面活性剤溶液〔理研
ビタミン(株)製、リケマールB−207の0.005
重量%水溶液〕を用いた。高さ30cmの四角柱(木
製、縦10cm、横30cm、高さ30cm)を40c
mの間隔で平行に立て、その上に平板ガラス(縦30c
m、横60cm、厚み3mm)を置く。厚さ2mmのポ
リカーボネート製のセル枠(縦7cm、横7cm、高さ
1.5cmのセルを縦5個、横3個、計15セルに区切
られた枠)を平板ガラス上にセットし、マーキングした
円が枠の中央に来るように試料フィルムを置く。該円の
ほぼ中央部に上記溶液をスポイトにより10ml滴下
し、溶液がシミ出す時間を測定する。2個の四角柱間に
鏡を置き、溶液がフィルムを通過し、ガラス板へシミ出
す様子をガラス板の下部より観察する。直径5cmの円
のほぼ中央部に直径約0.5mmのピンポイントの不透
明部が現れた時点をシミ出し開始時間とし、直径5cm
の円の全面に不透明部が広がった時点をシミ出し終了時
間とする。シミ出し開始時間及びシミ出し終了時間共に
長いもの程シミだし性が改善された試料である。試験は
25℃の室温で行った。(6) Staining Start Time and End Time of Surfactant Aqueous Solution A square porous film sample of 10 cm in length and width is prepared. A circle having a diameter of 5 cm is drawn in the center of the sample in advance. Surfactant solution [Rikemar B-207, manufactured by Riken Vitamin Co., Ltd., 0.005
Wt% aqueous solution]. 30c square pillar (wooden, length 10cm, width 30cm, height 30cm) 40c
m at an interval of m and place a flat glass (length 30c
m, width 60 cm, thickness 3 mm). A 2mm-thick polycarbonate cell frame (frame divided into 7 cells vertically, 7cm horizontally and 5cm vertically, 5 cells and 3 cells, 15 cells in total) is set on the flat glass and marked. Place the sample film so that the circle is centered on the frame. 10 ml of the above solution was dropped into the approximate center of the circle with a dropper, and the time required for the solution to stain was measured. A mirror is placed between the two square pillars, and the manner in which the solution passes through the film and spots on the glass plate is observed from the bottom of the glass plate. The point at which a pinpoint opaque part having a diameter of about 0.5 mm appeared at the approximate center of a circle having a diameter of 5 cm was defined as the stain-out start time, and the diameter was 5 cm.
The point at which the opaque portion spreads over the entire surface of the circle is referred to as the spotting end time. The longer the stain-out start time and the stain-out end time, the better the stainability. The test was performed at room temperature of 25 ° C.
【0032】実施例1 ポリエチレン系樹脂40重量部中、線型低密度ポリエチ
レン〔三井石油化学工業(株)製、商品名:ウルトゼッ
クス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕38重量部(ポリエチレン系樹脂中
95重量%)に対し、分岐状低密度ポリエチレン〔三井
石油化学工業(株)製、商品名:ミラソンF102、密
度:0.919g/cm3、MI:0.35g/10
分〕を2重量部(ポリエチレン系樹脂中5重量%)、炭
酸カルシウム〔同和カルファイン(株)製、商品名:S
ST−40、平均粒径:1.0μm〕60重量部、エチ
レンビスステアリン酸アミド〔日本化成(株)製、商品
名:スリバックスE〕3重量部をタンブラーミキサーに
て混合した後、タンデム型混練押出機を用いて220℃
で均一に混練し、ペレット状に加工した。このペレット
をTダイが装着された押出成形機を用いて、240℃に
おいて溶融製膜したあと、70℃に加熱した予熱ロール
延伸ロールとの間で2.0倍の延伸倍率でライン速度2
0m/分で機械方向に一軸延伸し、厚さ25μmの通気
性フィルムを得た。得られた多孔性フィルムの諸特性を
上記方法により測定した。原料の種類及びその配合割合
(重量部)を〔表1〕、得られた特性を〔表2〕にそれ
ぞれ示す。Example 1 A linear low-density polyethylene (manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultrazex 2021L, density: 0.920 g / cm 3 , MI: 40 parts by weight of polyethylene resin)
2.1 g / 10 min] to 38 parts by weight (95% by weight in the polyethylene resin) of a branched low-density polyethylene [manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason F102, density: 0.919 g / cm] 3 , MI: 0.35 g / 10
Parts) (2% by weight in polyethylene resin), calcium carbonate (manufactured by Dowa Calfine Co., Ltd., trade name: S)
ST-40, average particle size: 1.0 μm], 60 parts by weight, and ethylene bisstearic acid amide [manufactured by Nippon Kasei Co., Ltd., trade name: Srivacs E], 3 parts by weight, are mixed with a tumbler mixer, and then tandem-type 220 ° C using a kneading extruder
And uniformly kneaded, and processed into pellets. The pellets were melt-formed at 240 ° C. using an extruder equipped with a T-die, and then stretched at a draw ratio of 2.0 times between a preheated roll heated at 70 ° C. and a line speed of 2 mm.
The film was uniaxially stretched in the machine direction at 0 m / min to obtain a 25 μm thick breathable film. Various properties of the obtained porous film were measured by the above methods. Table 1 shows the types of raw materials and their mixing ratios (parts by weight), and Table 2 shows the properties obtained.
【0033】実施例2 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕36重量部(ポリエチレン系樹脂中
90重量%)に対し、分岐状低密度ポリエチレン〔三井
石油化学工業(株)製、商品名:ミラソンF102、密
度:0.919g/cm3、MI:0.35g/10
分〕4重量部(ポリエチレン系樹脂中10重量%)とし
た以外は、実施例1と同じ方法で多孔性フィルムを得
た。得られた結果を〔表1〕及び〔表2〕に示す。Example 2 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultzex 2021L, density: 0.920 g / cm 3 , MI:
2.1 g / 10 min] to 36 parts by weight (90% by weight in polyethylene resin) of branched low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Mirason F102, density: 0.919 g / cm] 3 , MI: 0.35 g / 10
Min] 4 parts by weight (10% by weight in the polyethylene resin) to obtain a porous film in the same manner as in Example 1. The obtained results are shown in [Table 1] and [Table 2].
【0034】実施例3 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕38.8重量部(ポリエチレン系樹
脂中97重量%)に対し、分岐状低密度ポリエチレン
〔三井石油化学工業(株)製、商品名ミラソンF10
2、密度:0.919g/cm3、MI:0.35g/
10分〕1.2重量部(ポリエチレン系樹脂中3重量
%)とした以外は、実施例1と同じ方法で多孔性フィル
ムを得た。得られた結果を〔表1〕及び〔表2〕に示
す。Example 3 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultrazex 2021L, density: 0.920 g / cm 3 , MI:
2.1 g / 10 min] to 38.8 parts by weight (97% by weight in polyethylene resin) of branched low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name Mirason F10
2, density: 0.919 g / cm 3 , MI: 0.35 g /
10 minutes] A porous film was obtained in the same manner as in Example 1 except that the amount was 1.2 parts by weight (3% by weight in the polyethylene resin). The obtained results are shown in [Table 1] and [Table 2].
【0035】実施例4 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕31重量部(ポリエチレン系樹脂中
77.5重量%)に対し、分岐状低密度ポリエチレン
〔三井石油化学工業(株)製、商品名ミラソンF10
2、密度:0.919g/cm3、MI:0.35g/
10分〕9重量部(ポリエチレン系樹脂中22.5重量
%)とした以外は、実施例1と同じ方法で多孔性フィル
ムを得た。得られた結果を〔表1〕及び〔表2〕に示
す。Example 4 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultrazex 2021L, density: 0.920 g / cm 3 , MI:
2.1 g / 10 min] to 31 parts by weight (77.5% by weight in polyethylene resin) of branched low-density polyethylene (trade name: Mirason F10, manufactured by Mitsui Petrochemical Industries, Ltd.)
2, density: 0.919 g / cm 3 , MI: 0.35 g /
10 minutes] A porous film was obtained in the same manner as in Example 1 except that the amount was 9 parts by weight (22.5% by weight in the polyethylene resin). The obtained results are shown in [Table 1] and [Table 2].
【0036】実施例5 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕36重量部(ポリエチレン系樹脂中
90重量%)に対し、分岐状低密度ポリエチレン〔三井
石油化学工業(株)製、商品名:ミラソン27、密度:
0.918g/cm3、MI:2.0g/10分〕4重
量部(ポリエチレン系樹脂中10重量%)とした以外
は、実施例1と同じ方法で多孔性フィルムを得た。得ら
れた結果を〔表1〕及び〔表2〕に示す。Example 5 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultzex 2021L, density: 0.920 g / cm 3 , MI:
2.1 g / 10 min] to 36 parts by weight (90% by weight in polyethylene resin) of branched low-density polyethylene [manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason 27, density:
0.918 g / cm 3 , MI: 2.0 g / 10 min], and a porous film was obtained in the same manner as in Example 1 except that 4 parts by weight (10% by weight in the polyethylene resin) was used. The obtained results are shown in [Table 1] and [Table 2].
【0037】実施例6 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:エボリュー1
540、密度:0.915g/cm3、MI:4.0g
/10分〕36重量部(ポリエチレン系樹脂中90重量
%)に対し、分岐状低密度ポリエチレン〔三井石油化学
工業(株)製、商品名:ミラソンF102、密度:0.
919g/cm3、MI:0.35g/10分〕4重量
部(ポリエチレン系樹脂中10重量%)とした以外は、
実施例1と同じ方法で多孔性フィルムを得た。得られた
結果を〔表1〕及び〔表2〕に示す。Example 6 The polyethylene resin of Example 1 was replaced with linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Evolue 1]
540, density: 0.915 g / cm 3 , MI: 4.0 g
/ 10 min] to 36 parts by weight (90% by weight in polyethylene resin) of branched low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Mirason F102, density: 0.1%.
919 g / cm 3 , MI: 0.35 g / 10 min] except that it was 4 parts by weight (10% by weight in the polyethylene resin).
A porous film was obtained in the same manner as in Example 1. The obtained results are shown in [Table 1] and [Table 2].
【0038】実施例7 実施例1のエチレンビスステアリン酸アミド〔日本化成
(株)製、商品名:スリバックスE〕の量を8重量部に
した以外は、実施例1と同じ方法で多孔性フィルムを得
た。得られた結果を〔表1〕及び〔表2〕に示す。Example 7 Porous material was prepared in the same manner as in Example 1 except that the amount of ethylene bisstearic acid amide (trade name: Srivacs E, manufactured by Nippon Kasei Co., Ltd.) was changed to 8 parts by weight. A film was obtained. The obtained results are shown in [Table 1] and [Table 2].
【0039】実施例8 実施例1のエチレンビスステアリン酸アミド〔日本化成
(株)製、商品名:スリバックスE〕の量を0.7重量
部にした以外は、実施例1と同じ方法で多孔性フィルム
を得た。得られた結果を〔表1〕及び〔表2〕に示す。Example 8 The same method as in Example 1 was used except that the amount of ethylenebisstearic acid amide (trade name: Srivacs E, manufactured by Nippon Kasei Co., Ltd.) was changed to 0.7 part by weight. A porous film was obtained. The obtained results are shown in [Table 1] and [Table 2].
【0040】実施例9 実施例1のエチレンビスステアリン酸アミドをメチレン
ビスステアリン酸アミド〔日本化成(株)製、商品名:
ビスアマイド〕とした以外は、実施例1と同じ方法で多
孔性フィルムを得た。得られた結果を〔表1〕及び〔表
2〕に示す。Example 9 The ethylene bisstearic acid amide of Example 1 was replaced with methylene bisstearic acid amide [trade name, manufactured by Nippon Kasei Co., Ltd.]
Bisamide], and a porous film was obtained in the same manner as in Example 1. The obtained results are shown in [Table 1] and [Table 2].
【0041】実施例10 実施例1のエチレンビスステアリン酸アミドをエチレン
ビスオレイン酸アミド〔日本化成(株)製、商品名:ス
リバックスO〕とした以外は、実施例1と同じ方法で多
孔性フィルムを得た。得られた結果を〔表1〕及び〔表
2〕に示す。Example 10 Porous material was prepared in the same manner as in Example 1 except that the ethylenebisstearic acid amide of Example 1 was changed to ethylenebisoleic acid amide (trade name: Srivac O, manufactured by Nippon Kasei Co., Ltd.). A film was obtained. The obtained results are shown in [Table 1] and [Table 2].
【0042】実施例11 実施例1のエチレンビスステアリン酸アミド3部をエチ
レンビスステアリン酸アミド〔日本化成(株)製、商品
名:スリバックスE〕1.5部とメチレンビスステアリ
ン酸アミド〔日本化成(株)製、商品名:ビスアマイ
ド〕1.5部の混合物とした以外は、実施例1と同じ方
法で多孔性フィルムを得た。得られた結果を〔表1〕及
び〔表2〕に示す。Example 11 3 parts of ethylenebisstearic acid amide of Example 1 were replaced with 1.5 parts of ethylenebisstearic acid amide (trade name: Srivacs E, manufactured by Nippon Kasei Co., Ltd.) and methylene bisstearic acid amide [Japan Porous film was obtained in the same manner as in Example 1 except that the mixture was 1.5 parts by mass (trade name: Bisamide, manufactured by Kasei Co., Ltd.). The obtained results are shown in [Table 1] and [Table 2].
【0043】比較例1 ポリオレフィン系樹脂を、線型低密度ポリエチレン〔三
井石油化学工業(株)製、商品名:ウルトゼックス20
21L、密度:0.920g/cm3、MI:2.1g
/10分〕を40重量部(ポリエチレン系樹脂中100
重量%)にした以外は、実施例1と同じ方法で多孔性フ
ィルムを得た。得られた結果を〔表1〕及び〔表2〕に
示す。Comparative Example 1 A polyolefin resin was used as a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultzex 20]
21L, density: 0.920 g / cm 3 , MI: 2.1 g
/ 10 min] to 40 parts by weight (100 in polyethylene resin)
Wt%) to obtain a porous film in the same manner as in Example 1. The obtained results are shown in [Table 1] and [Table 2].
【0044】比較例2 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名ウルトゼックス
2021L、密度:0.920g/cm3、MI:2.
1g/10分〕39.6重量部(ポリエチレン系樹脂中
99重量%)に対し、分岐状低密度ポリエチレン〔三井
石油化学工業(株)製、商品名ミラソンF102、密
度:0.919g/cm3、MI:0.35g/10
分〕0.4重量部(ポリエチレン系樹脂中1重量%)と
した以外は、実施例1と同じ方法で多孔性フィルムを得
た。得られた結果を〔表1〕及び〔表2〕に示す。Comparative Example 2 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [UltoZex 2021L, manufactured by Mitsui Petrochemical Industries, Ltd., density: 0.920 g / cm 3 , MI: 2.
1g / 10 min] to 39.6 parts by weight (99% by weight in polyethylene resin) of branched low-density polyethylene [Mirason F102, manufactured by Mitsui Petrochemical Industries, Ltd., density: 0.919 g / cm 3 , MI: 0.35 g / 10
Min.] A porous film was obtained in the same manner as in Example 1, except that the amount was 0.4 parts by weight (1% by weight in the polyethylene resin). The obtained results are shown in [Table 1] and [Table 2].
【0045】比較例3 実施例1のポリエチレン系樹脂を線型低密度ポリエチレ
ン〔三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L、密度:0.920g/cm3、MI:
2.1g/10分〕29重量部(ポリエチレン系樹脂中
72.5重量%)に対し、分岐状低密度ポリエチレン
〔三井石油化学工業(株)製、商品名:ミラソンF10
2、密度:0.919g/cm3、MI:0.35g/
10分〕11重量部(ポリエチレン系樹脂中27.5重
量%)とした以外は、実施例1と同じ方法で多孔性フィ
ルムを得ようと試みたが、溶融成膜時にフィルムの伸び
が悪く、フィルム破れが発生し、サンプルを得ることが
できなかった。得られた結果を〔表1〕及び〔表2〕に
示す。Comparative Example 3 The polyethylene resin of Example 1 was replaced with a linear low-density polyethylene [manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Ultrazex 2021L, density: 0.920 g / cm 3 , MI:
2.1 g / 10 min] to 29 parts by weight (72.5% by weight in polyethylene resin) of branched low-density polyethylene [manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason F10]
2, density: 0.919 g / cm 3 , MI: 0.35 g /
10 minutes] An attempt was made to obtain a porous film in the same manner as in Example 1 except that the amount was 11 parts by weight (27.5% by weight in the polyethylene resin). The film was broken, and no sample could be obtained. The obtained results are shown in [Table 1] and [Table 2].
【0046】比較例4 ポリオレフィン系樹脂を線型低密度ポリエチレン〔三井
石油化学工業(株)製、商品名ウルトゼックス2021
L、密度:0.920g/cm3、MI:2.1g/1
0分〕36重量部ポリオレフィン系樹脂中90重量%)
と分岐状低密度ポリエチレン〔三井石油化学(株)製、
商品名:ミラソンF312、密度:0.925g/cm
3、メルトインデックス2.0g/10分〕4重量部
(ポリオレフィン系樹脂中10重量%)にした以外は、
実施例1と同じ方法で多孔性フィルムを得た。得られた
結果を〔表1〕及び〔表2〕に示す。Comparative Example 4 A polyolefin resin was used as a linear low-density polyethylene [Ultzex 2021 (trade name) manufactured by Mitsui Petrochemical Industries, Ltd.).
L, density: 0.920 g / cm 3 , MI: 2.1 g / 1
0 min] 36 parts by weight 90% by weight in polyolefin resin
And branched low-density polyethylene [Mitsui Petrochemical Co., Ltd.
Product name: Mirason F312, Density: 0.925 g / cm
3 , melt index 2.0 g / 10 min] except that 4 parts by weight (10% by weight in polyolefin resin)
A porous film was obtained in the same manner as in Example 1. The obtained results are shown in [Table 1] and [Table 2].
【0047】比較例5 エチレンビスステアリン酸アミドのかわりに、精製ヒマ
シ油〔伊藤製油(株)製〕を3重量部とした以外は、実
施例1と同じ方法で多孔性フィルムを得た。得られた結
果を〔表1〕及び〔表2〕に示す。Comparative Example 5 A porous film was obtained in the same manner as in Example 1, except that 3 parts by weight of purified castor oil (manufactured by Ito Oil Co., Ltd.) was used instead of ethylenebisstearic acid amide. The obtained results are shown in [Table 1] and [Table 2].
【0048】比較例6 エチレンビスステアリン酸アミドのかわりに、硬化ヒマ
シ油〔伊藤製油(株)製、商品名:カスターワックス〕
を3重量部添加した以外は、実施例1と同じ方法で多孔
性フィルムを得た。得られた結果を〔表1〕及び〔表
2〕に示す。Comparative Example 6 Instead of ethylenebisstearic acid amide, hydrogenated castor oil (trade name: Custerwax, manufactured by Ito Oil Co., Ltd.)
Was added in the same manner as in Example 1 except that 3 parts by weight was added. The obtained results are shown in [Table 1] and [Table 2].
【0049】比較例7 エチレンビスステアリン酸アミドの添加量を0.3部と
した以外は、実施例1と同じ方法で多孔性フィルムを得
た。得られた結果を〔表1〕及び〔表2〕に示す。Comparative Example 7 A porous film was obtained in the same manner as in Example 1 except that the amount of ethylenebisstearic acid amide was changed to 0.3 part. The obtained results are shown in [Table 1] and [Table 2].
【0050】比較例8 エチレンビスステアリン酸アミドの添加量を12部とし
た以外は、実施例1と同じ方法で多孔性フィルムを得
た。得られた結果を〔表1〕及び〔表2〕に示す。Comparative Example 8 A porous film was obtained in the same manner as in Example 1, except that the amount of ethylenebisstearic acid amide was changed to 12 parts. The obtained results are shown in [Table 1] and [Table 2].
【0051】比較例9 エチレンビスステアリン酸アミドの代わりにオレイン酸
アミド〔日本化成(株)製、商品名:ダイヤミッドO〕
を3重量部添加した以外は、実施例1と同じ方法で、多
孔性フィルムを得た。得られた結果を〔表1〕及び〔表
2〕に示す。Comparative Example 9 Oleic acid amide [manufactured by Nippon Kasei Co., Ltd., trade name: Diamid O] instead of ethylene bisstearic acid amide
Was added in the same manner as in Example 1 except that 3 parts by weight was added to obtain a porous film. The obtained results are shown in [Table 1] and [Table 2].
【0052】比較例10 エチレンビスステアリン酸アミドの代わりにステアリン
酸アミド〔日本化成(株)製、商品名:アマイドAP−
1〕を3重量部添加した以外は、実施例1と同じ方法
で、多孔性フィルムを得た。得られた結果を〔表1〕及
び〔表2〕に示す。Comparative Example 10 In place of ethylene bisstearic acid amide, stearic acid amide [manufactured by Nippon Kasei Co., Ltd., trade name: Amide AP-
1] was obtained in the same manner as in Example 1 except that 3 parts by weight of [1] was added. The obtained results are shown in [Table 1] and [Table 2].
【0053】比較例11 エチレンビスステアリン酸アミドの代わりにエチレンビ
スベヘン酸アミド〔日本化成(株)製、商品名:スリバ
ックスB〕3重量部添加した以外は、実施例1と同じ方
法で多孔性フィルムを得た。得られた結果を〔表1〕及
び〔表2〕に示す。Comparative Example 11 Porous material was prepared in the same manner as in Example 1 except that 3 parts by weight of ethylenebisbehenamide (trade name: Srivac B, manufactured by Nippon Kasei Co., Ltd.) was added instead of ethylenebisstearic acid amide. A functional film was obtained. The obtained results are shown in [Table 1] and [Table 2].
【0054】比較例12 エチレンビスステアリン酸アミドの代わりにリシノール
酸アミド〔日本化成(株)製、商品名:ダイヤミッド
H〕を3重量部添加した以外は、実施例1と同じ方法で
多孔性フィルムを得た。得られた結果を〔表1〕及び
〔表2〕に示す。Comparative Example 12 Porous material was prepared in the same manner as in Example 1 except that 3 parts by weight of ricinoleamide (trade name: Diamid H, manufactured by Nippon Kasei Co., Ltd.) was added instead of ethylenebisstearic acid amide. A film was obtained. The obtained results are shown in [Table 1] and [Table 2].
【0055】[0055]
【表1】 [Table 1]
【0056】<〔表1〕の記号の説明>〔表1〕中のア
ルファベットは下記を意味する。 A:三井石油化学工業(株)製、商品名:ウルトゼック
ス2021L B:三井石油化学工業(株)製、商品名:エボリューS
P1540 C:三井石油化学工業(株)製、商品名:ミラソンF1
02 D:三井石油化学工業(株)製、商品名:ミラソン27 E:三井石油化学工業(株)製、商品名:ミラソンF3
12 F:日本化成(株)製、商品名:エチレンビスステアリ
ン酸アマイド スリバックスE G:日本化成(株)製、商品名:メチレンビスステアリ
ン酸アマイド ビスアマイドH:日本化成(株)製、商
品名:エチレンビスオレイン酸アマイド スリバックス
O I:日本化成(株)製、商品名:オレイン酸アマイド
ダイヤミッドO J:日本化成(株)製、商品名:ステアリン酸アマイド
アマイドAP−1 K:日本化成(株)製、商品名:エチレンビスベヘン酸
アマイド スリバックスB L:日本化成(株)製、商品名:リシノール酸アマイド
ダイヤミッドH M:F50重量%及びG50重量%の混合物 N:伊藤製油(株)製、商品名:精製ヒマシ油 O:伊藤製油(株)製、商品名:硬化ヒマシ油カスター
ワックス また、〔表1〕中の数値は重量部を示す。<Explanation of Symbols in [Table 1]] The alphabets in [Table 1] mean the following. A: manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: ULTZEX 2021L B: manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Evolu S
P1540 C: manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason F1
02 D: Mitsui Petrochemical Industry Co., Ltd., trade name: Mirason 27 E: Mitsui Petrochemical Industry Co., Ltd., trade name: Mirason F3
12 F: Nippon Kasei Co., Ltd., trade name: ethylene bisstearic acid amide Sribaks EG: Nippon Kasei Co., Ltd., trade name: methylene bisstearic acid amide Bisamide H: Nippon Kasei Co., Ltd., trade name : Ethylene bisoleic acid amide Srivac OI: Nippon Kasei Co., Ltd., trade name: Oleic acid amide
Diamid O J: Nippon Kasei Co., Ltd., trade name: stearic acid amide Amide AP-1 K: Nippon Kasei Co., Ltd., trade name: ethylenebisbehenic acid amide Srivac BL: Nippon Kasei Co., Ltd. , Trade name: ricinoleic acid amide Diamid H M: mixture of 50% by weight of F and 50% by weight of N N: manufactured by Ito Oil Co., Ltd., trade name: refined castor oil O: manufactured by Ito Oil Co., Ltd., trade name: hardened castor Oil caster wax The numerical values in Table 1 represent parts by weight.
【0057】[0057]
【表2】 [Table 2]
【0058】[0058]
【発明の効果】本発明の多孔性フィルムは、厚みの均一
性、通気性、接着性、シミ出し特性が良好で風合いの優
れた多孔性フィルムである。また、本発明の方法によれ
ば、低倍率の高速延伸加工を行った場合でも上記特性を
有する多孔性フィルムを製造することができる。Industrial Applicability The porous film of the present invention is a porous film having good uniformity of thickness, air permeability, adhesiveness, and bleeding property and excellent texture. Further, according to the method of the present invention, a porous film having the above characteristics can be produced even when low-speed high-speed stretching is performed.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 仙波 克己 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 (72)発明者 伊関 勉 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 (72)発明者 榎本 敏行 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 (72)発明者 市川 太郎 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsumi Senba 2-1-1 Tangodori, Minami-ku, Nagoya City, Aichi Prefecture Inside of Mitsui Chemicals, Inc. (72) Inventor Tsutomu Iseki 2-1-1 Tangodori, Minami-ku, Nagoya City, Aichi Prefecture Mitsui Chemicals, Inc. (72) Inventor Toshiyuki Enomoto 2-1-1 Tangodori, Minami-ku, Nagoya, Aichi Prefecture Mitsui Chemicals Inc. (72) Inventor Taro Ichikawa 2-1-1, Tangodori, Minami-ku, Nagoya-shi, Aichi Mitsui Chemicals Inside the corporation
Claims (5)
分、密度0.910〜0.940g/cm3の線型低密
度ポリエチレン75〜98重量%、及び、メルトインデ
ックス0.1〜2g/10分、密度0.915〜0.9
24g/cm 3の分岐状低密度ポリエチレン2〜25重
量%を含むポリエチレン系樹脂(A)25〜50重量
部、並びに、無機充填剤(B)75〜50重量部を含
み、且つ、(A)及び(B)100重量部に対してエチ
レンビスステアリン酸アミド、メチレンビスステアリン
酸アミド及びメチレンビスオレイン酸アミドから選ばれ
た少なくとも1種の化合物0.5〜10重量部を含むこ
とを特徴とする多孔性フィルム。1. Melt index 0.5 to 5 g / 10
Min, density 0.910-0.940 g / cmThreeLinear low density
Polyethylene 75-98% by weight and melt index
Box 0.1-2 g / 10 min, density 0.915-0.9
24g / cm ThreeBranched low-density polyethylene of 2 to 25 layers
% To 25% by weight of polyethylene resin (A)
Parts, and 75 to 50 parts by weight of the inorganic filler (B).
And 100 parts by weight of (A) and (B)
Lenbisstearic acid amide, methylenebisstearin
Selected from acid amide and methylenebisoleic amide
And 0.5 to 10 parts by weight of at least one compound.
And a porous film.
ことを特徴とする請求項1記載の多孔性フィルム。2. The porous film according to claim 1, wherein the film thickness is 10 to 100 μm.
分、密度0.910〜0.940g/cm3の線型低密
度ポリエチレン75〜98重量%、及び、メルトインデ
ックス0.1〜2g/10分、密度0.915〜0.9
24g/cm 3の分岐状低密度ポリエチレン2〜25重
量%を含むポリエチレン系樹脂(A)25〜50重量
部、並びに、無機充填剤(B)75〜50重量部を含
み、且つ、(A)及び(B)100重量部に対して、エ
チレンビスステアリン酸アミド、メチレンビスステアリ
ン酸アミド及びメチレンビスオレイン酸アミドから選ば
れた少なくとも1種の化合物0.5〜10重量部を含む
樹脂組成物をフィルム状に成形し、得られたフィルムを
室温〜樹脂の軟化温度の範囲において少なくとも一軸方
向に1.2〜5倍延伸することを特徴とする多孔性フィ
ルムの製造方法。3. Melt index 0.5 to 5 g / 10
Min, density 0.910-0.940 g / cmThreeLinear low density
Polyethylene 75-98% by weight and melt index
Box 0.1-2 g / 10 min, density 0.915-0.9
24g / cm ThreeBranched low-density polyethylene of 2 to 25 layers
% To 25% by weight of polyethylene resin (A)
Parts, and 75 to 50 parts by weight of the inorganic filler (B).
And 100 parts by weight of (A) and (B)
Tylene bis stearamide, methylene bis stearyl
Selected from acid amide and methylenebisoleic acid amide
0.5 to 10 parts by weight of at least one compound
The resin composition is formed into a film, and the obtained film is
At least one axis in the range of room temperature to softening temperature of resin
Characterized in that it is stretched 1.2 to 5 times in the
The manufacturing method of LUM.
度範囲において0.1〜100秒間加熱処理することを
特徴とする請求項3記載の多孔性フィルムの製造方法。4. The method for producing a porous film according to claim 3, wherein after the stretching, heat treatment is performed for 0.1 to 100 seconds in a temperature range from a softening temperature of the resin to a temperature lower than the melting point.
ことを特徴とする請求項3または4記載の多孔性フィル
ムの製造方法。5. The method for producing a porous film according to claim 3, wherein the film has a thickness of 10 to 100 μm.
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JP27124898A JP4054120B2 (en) | 1997-09-29 | 1998-09-25 | Porous film and method for producing the same |
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JP26438597 | 1997-09-29 | ||
JP9-264385 | 1997-09-29 | ||
JP27124898A JP4054120B2 (en) | 1997-09-29 | 1998-09-25 | Porous film and method for producing the same |
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JP27124898A Expired - Fee Related JP4054120B2 (en) | 1997-09-29 | 1998-09-25 | Porous film and method for producing the same |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001046302A1 (en) * | 1999-12-22 | 2001-06-28 | Mitsui Chemicals, Inc. | Porous film and process for producing the same |
JP2002030169A (en) * | 2000-07-17 | 2002-01-31 | Mitsui Chemicals Inc | Porous film |
-
1998
- 1998-09-25 JP JP27124898A patent/JP4054120B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001046302A1 (en) * | 1999-12-22 | 2001-06-28 | Mitsui Chemicals, Inc. | Porous film and process for producing the same |
US7153566B2 (en) | 1999-12-22 | 2006-12-26 | Mitsui Chemicals, Inc. | Porous film and process for producing the same |
JP2002030169A (en) * | 2000-07-17 | 2002-01-31 | Mitsui Chemicals Inc | Porous film |
Also Published As
Publication number | Publication date |
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JP4054120B2 (en) | 2008-02-27 |
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