Title:
POROUS POLYIMIDE FILM PRODUCTION METHOD AND POROUS POLYIMIDE FILM PRODUCED USING SAID METHOD
Document Type and Number:
WIPO Patent Application WO/2018/021356
Kind Code:
A1
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.
Inventors:
OHYA SHUSEI (JP)
MATSUO MAKOTO (JP)
FUJII YUUICHI (JP)
BAMBA KEITA (JP)
MATSUO MAKOTO (JP)
FUJII YUUICHI (JP)
BAMBA KEITA (JP)
Application Number:
PCT/JP2017/026935
Publication Date:
February 01, 2018
Filing Date:
July 25, 2017
Export Citation:
Assignee:
UBE INDUSTRIES (JP)
International Classes:
C08J9/28; C08G73/10
Domestic Patent References:
| WO2011125988A1 | 2011-10-13 | |||
| WO2011043467A1 | 2011-04-14 | |||
| WO2010038873A1 | 2010-04-08 |
Foreign References:
| JP2011001434A | 2011-01-06 | |||
| JP2001205058A | 2001-07-31 | |||
| JP2005038687A | 2005-02-10 |
Other References:
See also references of EP 3489291A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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