Polyimide precursor, polyimide, flexible substrate prepared therewith, color filter and production method thereof, and flexible display device

Patent metadata

Field	Value
Publication number	US-9493614-B2
Application number	US-201314387823-A
Country	US
Kind code	B2
Filing date	Dec 26, 2013
Priority date	Feb 26, 2013
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

The present invention is based on a polyimide precursor having unit structures represented by general formula (1) and unit structures represented by general formula (2), provides a polyimide precursor for which film whitening, cracking and bubbling do not occur regardless of film baking conditions, and provides a flexible TFT array, a flexible color filter, and a flexible substrate with a gas barrier layer using the polyimide precursor, and a flexible display device, etc. using same. (In general formulas (1) and (2), X 1 -X 4 each independently represents a hydrogen atom, C1 to C10 monovalent organic group or C1 to C10 monovalent alkylsilyl group. R 1 is represented by general formula (3) and R 2 is represented by general formula (4).) (In general formula (4), R 3 and R 4 each independently represents a C1 to C10 monovalent organic group.)

First claim

The invention claimed is:

1. A polyimide precursor having a unit structure expressed by a general formula (1) and a unit structure expressed by a general formula (2):

wherein, in the general formulas (1) and (2), X 1 to X 4 each independently represent a hydrogen atom, a monovalent organic group with 1 to 10 carbon atoms or a monovalent alkylsilyl group with 1 to 10 carbon atoms, R 1 is represented by a general formula (3) and R 2 is represented by a general formula (4):

wherein, in the general formula (4), R 3 and R 4 each independently represent a monovalent organic group with 1 to 10 carbon atoms.

2. The polyimide precursor according to claim 1 , wherein a ratio of the unit structure expressed by a general formula (1) to the unit structure expressed by a general formula (2) [the number of moles of the unit structure expressed by a general formula (1)/the number of moles of the unit structure expressed by a general formula (2)] is 70/30 to 99.5/0.5.

3. A polyimide prepared from a polyimide precursor according to claim 1 .

4. A flexible substrate comprising a resin film containing a polyimide according to claim 3 .

5. A flexible substrate comprising an inorganic film disposed on a resin film containing a polyimide according to claim 3 .

6. A color filter comprising a black matrix and a colored pixel disposed on a resin film containing a polyimide according to claim 3 .

7. The color filter according to claim 6 , wherein a resin used for at least one layer of the black matrix and a colored pixel layer contains a polyimide resin.

8. The color filter according to claim 6 , wherein the black matrix is composed of a low optical density layer and a high optical density layer formed on the low optical density layer, and a resin used for at least one layer of the low optical density layer and the high optical density layer contains a polyimide resin.

9. The color filter according to claim 6 , further comprising an inorganic film.

10. A production method of a color filter, comprising a black matrix and a colored pixel disposed on a resin film containing a polymide prepared from a polymide precursor according to claim 1 comprising the following steps of:
(1) applying a resin composition containing a polyimide precursor according to claim 1 and a solvent on a support substrate;
(2) removing the solvent from the coated resin composition;
(3) obtaining a polyimide-containing resin film by imidizing the polyimide precursor in the resin composition;
(4) forming a black matrix and a colored pixel on the polyimide-containing resin film; and
(5) peeling off the polyimide-containing resin film from the support substrate.

11. The production method of a color filter according to claim 10 , further comprising the step of forming an inorganic film.

12. A flexible display device prepared by bonding a light-emitting element to a color filter according to claim 6 .

13. A flexible display device equipped with a light-emitting element disposed on a flexible substrate according to claim 4 .

14. The flexible display device according to claim 12 , wherein the light-emitting element is an organic EL element.

Assignees

• Toray Industries

Inventors

• Wakita Junji
• Jo Yukari
• Tomikawa Masao

Classifications

• C08G73/1042

  Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds · CPC title

• C08G73/1039

  comprising halogen-containing substituents · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• B29D11/00634

  Production of filters · CPC title

• C08G73/1064

  containing sulfur · CPC title