JP2006056929A5 - - Google Patents
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- JP2006056929A5 JP2006056929A5 JP2004237601A JP2004237601A JP2006056929A5 JP 2006056929 A5 JP2006056929 A5 JP 2006056929A5 JP 2004237601 A JP2004237601 A JP 2004237601A JP 2004237601 A JP2004237601 A JP 2004237601A JP 2006056929 A5 JP2006056929 A5 JP 2006056929A5
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- JP
- Japan
- Prior art keywords
- polyolefin
- microporous membrane
- producing
- bank
- roll
- Prior art date
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Description
本発明は前記課題を解決したものである。即ち本発明は、
（１）ポリオレフィン組成物と可塑剤を溶融混練し、Ｔダイから押出し、バンク（樹脂溜まり）を形成してキャスト成形することによりシートを作成した後、延伸し、可塑剤を抽出するポリオレフィン製微多孔膜の製造方法において、バンクの幅をロール間に挟持された該混練物の全幅に対し６割以上であることを特徴とするポリオレフィン製微多孔膜の製造方法、
（２）バンクを形成する面側のロールの温度を、バンクが形成されていない面側のロールの温度より高くすることを特徴とする（１）に記載のポリオレフィン製微多孔膜の製造方法、
（３）ロール温度が、構成するポリオレフィンの融点より３０℃低い温度以下、０℃以上であることを特徴とする、（２）に記載のポリオレフィン製微多孔膜の製造方法、
（４）ポリオレフィン組成物として、ポリエチレンを５０ｗｔ％以上使用することを特徴とする、（１）〜（３）のいずれかに記載のポリオレフィン製微多孔膜の製造方法、である。
（５）（１）〜（４）のいずれかの製造方法により得られたポリオレフィン製微多孔膜。
The present invention solves the above problems. That is, the present invention
(1) A polyolefin composition and a plasticizer are melt-kneaded, extruded from a T-die, formed into a bank (resin pool) and cast-molded to form a sheet, and then stretched to extract the plasticizer. In the method for producing a porous membrane, a method for producing a microporous membrane made of polyolefin, characterized in that the width of the bank is 60% or more of the total width of the kneaded material sandwiched between rolls ,
(2) The method for producing a polyolefin microporous membrane according to (1), wherein the temperature of the roll on the surface side forming the bank is higher than the temperature of the roll on the surface side where the bank is not formed,
(3) The method for producing a microporous membrane made of polyolefin according to (2), characterized in that the roll temperature is 30 ° C. lower than the melting point of the constituting polyolefin, 0 ° C. or higher,
(4) The method for producing a polyolefin microporous membrane according to any one of (1) to (3), wherein polyethylene is used in an amount of 50 wt% or more as the polyolefin composition.
(5) A polyolefin microporous membrane obtained by the production method of any one of (1) to (4).
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004237601A JP4925238B2 (en) | 2004-08-17 | 2004-08-17 | Method for producing polyolefin microporous membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004237601A JP4925238B2 (en) | 2004-08-17 | 2004-08-17 | Method for producing polyolefin microporous membrane |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2006056929A JP2006056929A (en) | 2006-03-02 |
| JP2006056929A5 true JP2006056929A5 (en) | 2007-09-06 |
| JP4925238B2 JP4925238B2 (en) | 2012-04-25 |
Family
ID=36104676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004237601A Active JP4925238B2 (en) | 2004-08-17 | 2004-08-17 | Method for producing polyolefin microporous membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4925238B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070264578A1 (en) * | 2006-05-15 | 2007-11-15 | Tonen Chemical Corporation | Microporous polyolefin membrane, its production method and battery separator |
| JP5586152B2 (en) * | 2006-12-04 | 2014-09-10 | 旭化成イーマテリアルズ株式会社 | Polyolefin microporous membrane |
| JP2010235707A (en) * | 2009-03-30 | 2010-10-21 | Asahi Kasei E-Materials Corp | Method for producing polyolefin microporous film |
| KR102121824B1 (en) * | 2012-10-03 | 2020-06-11 | 도레이 카부시키가이샤 | Biaxially stretched microporous film |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276410A (en) * | 1991-03-04 | 1992-10-01 | Nippon Steel Corp | Controlling method for thickness of polymer sheet |
| JPH06126765A (en) * | 1992-10-21 | 1994-05-10 | Bridgestone Corp | Method for feeding band-like material to calender roll |
| JP3641321B2 (en) * | 1996-05-08 | 2005-04-20 | 東燃化学株式会社 | Method for producing polyolefin microporous membrane |
| JPH10296766A (en) * | 1997-04-23 | 1998-11-10 | Mitsui Chem Inc | Calender molding method |
| JPH1121362A (en) * | 1997-07-07 | 1999-01-26 | Mitsubishi Chem Corp | Porous polyethylene resin film |
| JP2000281844A (en) * | 1999-03-31 | 2000-10-10 | Mitsui Chemicals Inc | Olefinic resin composition and its formed product |
| JP2004099799A (en) * | 2002-09-11 | 2004-04-02 | Asahi Kasei Chemicals Corp | Rolled item of fine porous membrane made of polyolefin |
| JP4121846B2 (en) * | 2002-12-16 | 2008-07-23 | 東燃化学株式会社 | Polyolefin microporous membrane and production method and use thereof |
| JP4492917B2 (en) * | 2003-05-07 | 2010-06-30 | 旭化成イーマテリアルズ株式会社 | Method for producing polyolefin microporous membrane |
-
2004
- 2004-08-17 JP JP2004237601A patent/JP4925238B2/en active Active
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