Colored polyimide molded article, and process for production thereof

Patent metadata

Field	Value
Publication number	US-9346927-B2
Application number	US-201013500771-A
Country	US
Kind code	B2
Filing date	Oct 8, 2010
Priority date	Oct 9, 2009
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

Disclosed is a process for production of a colored polyimide molded article including the steps of molding a polyamic acid solution composition containing a polyamic acid solution obtained from at least a tetracarboxylic acid component and a diamine component and a coloring precursor, or a polyimide solution composition containing a polyimide solution and a coloring precursor; and then thermally treating a molded product at 250° C. or higher.

First claim

The invention claimed is:

1. A process for producing a colored polyimide molded article, the process comprising:
(a) dipping a film obtained by casting
a polyamic composition comprising a polyamic acid solution and a coloring precursor in a poor solvent against the polyamic acid to fabricate a porous polyamic acid film, where the polyamic acid solution is obtained from at least one tetracarboxylic acid and a diamine;

and
(b) thermally treating the porous polyamic acid film at a temperature of from 350 to 500° C. to obtain the colored polyimide molded article, which is a colored polyimide porous membrane,
wherein
the coloring precursor is a polymer obtained from an acrylonitrile-comprising monomer, and
no carbon black is present in the polyamic composition the tetracarboxylic acid is at least one selected from the group consisting of a biphenyltetracarboxylic dianhydride and pyromellitic dianhydride; and the diamine is at least one selected from the group consisting of p-phenylenediamine diaminodiphenyl ether, and bis(aminophenoxy)benzene.

2. The process of claim 1 , wherein the polyamic composition is a suspension liquid or a transparent uniform solution.

3. The process of claim 1 , wherein the poor solvent is water or a water-containing mixed solvent.

4. The process of claim 1 , wherein the thermally treating (b) occurs in the air for a period of from 5 to 60 minutes in a state of fixing the molded product.

5. The process of claim 1 , wherein the coloring precursor is polyacrylonitrile.

Assignees

• Ohya Shyusei
• Matsuo Makoto
• Ube Industries

Inventors

• Ohya Shyusei
• Matsuo Makoto

Classifications

• Y10T428/249981

  Plural void-containing components · CPC title

• C08L79/08

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

• C08J3/212 Primary

  and solid additives · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08J9/34

  Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core · CPC title