Method for producing porous polyimide film, and porous polyimide film

Patent metadata

Field	Value
Publication number	US-10195794-B2
Application number	US-201715613549-A
Country	US
Kind code	B2
Filing date	Jun 5, 2017
Priority date	Mar 26, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

There is provided a method for producing a porous polyimide film, including a first step of forming a coating film containing a polyimide precursor solution where a polyimide precursor and an organic amine compound are dissolved in an aqueous solvent, and a resin particle incapable of dissolving in the polyimide precursor solution, followed by drying of the coating film to form a coat containing the polyimide precursor and the resin particle, and a second step of heating the coat to imidize the polyimide precursor and form a polyimide film, the second step including a treatment for removing the resin particle.

First claim

What is claimed is:

1. A porous polyimide film comprising:
a polyimide film,
an uncrosslinked resin except for a polyimide resin, wherein a content of the uncrosslinked resin except for a polyimide resin is from 0.1 mass % to 5 mass % relative to the entire porous polyimide film; and
a substantially spherical vacancy.

2. The porous polyimide film as claimed in claim 1 , wherein the uncrosslinked resin except for a polyimide resin is an uncrosslinked resin soluble in a solvent incapable of dissolving the polyimide resin.

3. A method for producing a resin particle-dispersed polyimide precursor solution, comprising polymerizing a tetracarboxylic acid dianhydride and a diamine compound in a resin particle dispersion liquid wherein resin particles are dispersed in an aqueous solvent, in the presence of an organic amine compound to form a polyimide precursor.

4. The method for producing a resin particle-dispersed polyimide precursor solution as claimed in claim 3 , wherein the resin particle dispersion liquid is a dispersion liquid wherein the resin particle is granulated in the aqueous solvent.

5. The method for producing a resin particle-dispersed polyimide precursor solution as claimed in claim 3 , wherein the organic amine compound is a tertiary amine compound.

6. The method for producing a resin particle-dispersed polyimide precursor solution as claimed in claim 3 , wherein the organic amine compound is an amine compound having a nitrogen-containing heterocyclic structure.

7. A resin particle-dispersed polyimide precursor solution obtained by the production method claimed in claim 3 .

Assignees

• Fuji Xerox Co Ltd

Inventors

• Nukada Katsumi
• Miyamoto Tsuyoshi
• Sasaki Tomoya
• Miyazaki Kana

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C09D179/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08L2203/16

  used for films · CPC title

• C08J7/08

  Heat treatment · CPC title

• B29K2105/0002

  monomers or prepolymers · CPC title