发明名称 |
METHOD FOR PRODUCING POROUS POLYIMIDE FILM, POROUS POLYIMIDE FILM AND SEPARATOR USING SAME |
摘要 |
Provided is a method for producing a separator which has uniform and dense pores on the negative electrode surface side. A method for producing a porous polyimide film according to the present invention comprises: a first un-burned composite film forming step wherein a first un-burned composite film is formed on a substrate using a first varnish that contains (A1) a polyamide acid or a polyimide and (B1) fine particles at a volume ratio (A1):(B1) of from 19:81 to 45:65; a second un-burned composite film forming step wherein a second un-burned composite film is formed on the first unburned composite film using a second varnish that contains (A2) a polyamide acid or a polyimide and (B2) fine particles at a volume ratio (A2):(B2) of from 20:80 to 50:50 and has a lower fine particle content ratio than the first varnish; a burning step wherein an un-burned composite film composed of the first un-burned composite film and the second un-burned composite film is burned, thereby obtaining a polyimide-fine particle composite film; and a fine particle removal step wherein the fine particles are removed from the polyimide-fine particle composite film. |
申请公布号 |
EP2990199(A4) |
申请公布日期 |
2016.04.20 |
申请号 |
EP20140787967 |
申请日期 |
2014.03.31 |
申请人 |
TOKYO OHKA KOGYO CO., LTD. |
发明人 |
SUGAWARA, TSUKASA;ASAI, TAKAHIRO |
分类号 |
B32B27/34;B01D67/00;B01D69/02;B01D69/12;B01D71/64;B32B5/22;C08J9/26;H01M2/16;H01M8/02;H01M8/10 |
主分类号 |
B32B27/34 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|