Title:
VARNISH FOR PRODUCTION OF POLYIMIDE POROUS MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2022/091915
Kind Code:
A1
Abstract:
[Problem] To provide: a varnish composition that has a uniform compositional makeup including organic fine particles from which it is possible to form a polyimide porous membrane having fine uniform spherical pores having a diameter equivalent to the median diameter of the particles; a production method for a precursor membrane of a polyimide porous membrane, using said varnish composition; and a production method for a polyimide porous membrane using said precursor membrane. [Solution] This varnish composition for forming a polyimide porous membrane is obtained by mixing a polyamic acid (A), organic fine particles (B), and a solvent (S). The organic fine particles (B) include vinyl-based resin particles of a polymer having a structural unit (a) derived from a vinyl-based monomer and a structural unit (b1) that is derived from a compound represented by general formula (I) and that is different from the structural unit (a). [In the formula, m represents an integer of 1-3, R represents a polymerizable unsaturated group, AO represents an alkyleneoxy group having 2-4 carbon atoms, n represents an integer of 0-100, and X represents a hydrogen atom or an anionic hydrophilic group.]
Inventors:
NOGUCHI TAKUYA (JP)
Application Number:
PCT/JP2021/038813
Publication Date:
May 05, 2022
Filing Date:
October 20, 2021
Export Citation:
Assignee:
TOKYO OHKA KOGYO CO LTD (JP)
International Classes:
C08J3/11; B29C67/20; C08J9/26; C08L25/18; C08L79/08
Domestic Patent References:
| WO2017038898A1 | 2017-03-09 | |||
| WO2016027825A1 | 2016-02-25 | |||
| WO2014196656A1 | 2014-12-11 | |||
| WO2020105673A1 | 2020-05-28 |
Foreign References:
| JP2016056225A | 2016-04-21 | |||
| JP2015165005A | 2015-09-17 | |||
| JP2010024385A | 2010-02-04 | |||
| JP2008287888A | 2008-11-27 | |||
| JP2011116951A | 2011-06-16 | |||
| JP2016033913A | 2016-03-10 | |||
| JP2019014850A | 2019-01-31 | |||
| CN104841423A | 2015-08-19 | |||
| CN103602058A | 2014-02-26 |
Attorney, Agent or Firm:
HANABUSA PATENT & TRADEMARK OFFICE (JP)
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