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Title:
METHOD FOR PRODUCING POROUS FILM
Document Type and Number:
Japanese Patent JP3886124
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a method for producing a porous film having thin thickness even in the case of containing a thermoplastic elastomer and high porosity and excellent air permeability while keeping high strength and provide a method for producing a separator for battery.
SOLUTION: The method for producing a porous film contains a step to melt and knead a composition at least containing a polyolefin resin, a thermoplastic elastomer and a solvent, cooling the kneaded mixture after extrusion to form a formed sheet, rolling the sheet and carrying out the drawing and desolvation treatment. The rolling treatment is carried out under a condition to get an elastic recovery of the rolled sheet of ≤20% calculated by formula (1). Elastic recovery r[%]=100×(t-t0)/t0; (1) wherein t0 is the smallest gap of the sheet rolling part in the rolling treatment and t is the thickness of the sheet of elastically recovered state after releasing the pressure.


Inventors:
大泉 新一
山本 一成
市川 智明
Application Number:
JP2002312507A
Publication Date:
February 28, 2007
Filing Date:
October 28, 2002
Export Citation:
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Assignee:
日東電工株式会社
International Classes:
B29C43/22; C08J9/00; B29C43/48; C08J9/26; B29C55/00; B29C55/18; B29C67/20; B29C69/02; B29D7/01; C08J5/18; C08L23/00; C08L101/00; H01M2/16; B29K23/00; (IPC1-7): C08J9/26; B29C67/20; C08L23/00; C08L101/00; H01M2/16; //B29K23:00
Domestic Patent References:
JP2002047372A
Attorney, Agent or Firm:
鈴木 崇生
梶崎 弘一
尾崎 雄三
谷口 俊彦