Polyimides, coating composition formed therefrom and use thereof

• US 10,280,334 B2
• Filed: 12/27/2013
• Issued: 05/07/2019
• Est. Priority Date: 02/08/2013
• Status: Active Grant

• Current Assignee: Eternal Materials Co., Ltd.
• Original Assignee: Eternal Materials Co., Ltd.
• Inventors: Chou, Meng-Yen, Wu, Chung-Jen
• Primary Examiner(s): Stanley, Jane L
• Application Number:
  US14/141,810
• Publication Number:
  US 20140228512A1
• Time in Patent Office: 1,957 Days
• Field of Search: 524600
• CPC Class Codes: C08G 73/10 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C08G 73/1039 comprising halogen-containing substituents
• CPC Class Codes: C08G 73/106 containing silicon
• CPC Class Codes: C09D 179/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Abstract

A polyimide (PI) having two —COOH capping groups at each end is provided. A coating composition is further provided, which contains the PI and a hardening agent having 2 to 6 functional groups capable of reacting with —COOH. A PI coating layer and PI film formed by the coating composition of the present invention possess excellent chemical resistance and coefficient of thermal expansion (CTE), which makes them applicable in fabrication of protective materials for active/passive devices, optical materials, touch panels, copper foil substrates, soft flexible electronic materials or integrated circuit elements, or film substrate for glass film touch panels.

Claims

1. A coating composition comprising at least 1% of polyimide (PI), based on the total weight of the composition, and a hardening agent having 2 to 6 functional groups capable of reacting with —

COOH,

wherein the polyimide (PI) has a structure represented by Formula (I);

2. The coating composition according to claim 1, wherein A, C and E are respectively a tetravalent organic group selected from the group consisting of the following groups:

3. The coating composition according to claim 2, wherein A, C and E are respectively a tetravalent organic group selected from the group consisting of the following groups:

4. The coating composition according to claim 3, wherein A, C and E are respectively a tetravalent organic group selected from the group consisting of the following groups:

5. The coating composition according to claim 1, wherein B is respectively a divalent organic group selected from the group consisting of the following groups:

6. The coating composition according to claim 5, wherein B is respectively a divalent organic group selected from the group consisting of the following groups:

7. The coating composition according to claim 6, wherein B is respectively a divalent organic group selected from the group consisting of the following groups:

8. The coating composition according to claim 1, wherein n is an integer of 1 to 100.

9. A flexible device, comprising a thin film formed by the coating composition according to claim 1.

10. The coating composition according to claim 1, wherein the hardening agent is (1,3-bis(4,5-dihydrooxazol-2-yl)benzene).