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1. (WO2018021356) POROUS POLYIMIDE FILM PRODUCTION METHOD AND POROUS POLYIMIDE FILM PRODUCED USING SAID METHOD

Pub. No.:    WO/2018/021356    International Application No.:    PCT/JP2017/026935
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Wed Jul 26 01:59:59 CEST 2017
IPC: C08J 9/28
C08G 73/10
Applicants: UBE INDUSTRIES, LTD.
宇部興産株式会社
Inventors: OHYA, Shusei
大矢 修生
MATSUO, Makoto
松尾 信
FUJII, Yuuichi
藤井 有一
BAMBA, Keita
番場 啓太
Title: POROUS POLYIMIDE FILM PRODUCTION METHOD AND POROUS POLYIMIDE FILM PRODUCED USING SAID METHOD
Abstract:
The present invention pertains to a porous polyimide film production method and a porous polyimide film produced using said method, said method including: a step (1) in which a polyamic acid solution comprising 40%-97% by mass organic polar solvent and 3%-60% by mass polyamic acid having an intrinsic viscosity, comprising tetracarboxylic acid units and diamine units, of 1.0-3.0 is cast in film form and immersed in or caused to come in contact with a coagulating solvent having water as an essential component thereof, and a porous film of polyamic acid is produced; and a step (2) in which the porous film of polyamic acid obtained in said step is heat treated and imidized. Shrinkage in the film longitudinal direction and transverse direction after heat treatment is suppressed to no more than 8% for each direction and the speed of temperature increase in a temperature range of at least 200°C during the heat treatment is at least 25°C/min.