Polyamic acid composition, polyamideimide film thereof and method for preparing polyamideimide film

Patent metadata

Field	Value
Publication number	US-10316145-B2
Application number	US-201715592550-A
Country	US
Kind code	B2
Filing date	May 11, 2017
Priority date	May 20, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Provided are a polyamic acid composition, a polyamideimide film thereof, and a method for preparing the polyamideimide film. More specifically, provided are a polyamideimide film capable of implementing excellent optical properties in addition to inherent physical properties of polyimide by using a polyamic acid composition including a combination of specific components, and a method for preparing the polyamideimide film.

First claim

What is claimed is:

1. A polyamideimide film derived from 2,2′-bis(trifluoromethyl)benzidine, cyclic aliphatic dianhydride, and aromatic diacid dichloride, and satisfying Equation 1 below:
( Tr _400 nm/ Tr _550 nm)≥0.96  [Equation 1]

wherein Equation 1 represents a transmittance ratio of a transmittance in a light having a wavelength of 400 nm to a transmittance in a light having a wavelength of 550 nm, Tr_400 nm is a transmittance at 400 nm, and Tr_550 nm is a transmittance at 550 nm,
wherein the polyamide film has a Yellow index of 2.4 or less.

2. The polyamideimide film of claim 1 , wherein the transmittance at 400 nm of the polyamideimide film is 85% or more.

3. The polyamideimide film of claim 1 , wherein the cyclic aliphatic dianhydride is cyclobutane tetracarboxylic dianhydride, and the aromatic diacid dichloride is isophthaloyl dichloride.

4. The polyamideimide film of claim 1 , wherein the aromatic diacid dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.

5. A polyamideimide film derived from components consisting of 2,2′-bis(trifluoromethyl)benzidine, cyclic aliphatic dianhydride, and isophthaloyl dichloride.

6. The polyamideimide film of claim 5 , wherein the isophthaloyl dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.

7. The polyamideimide film of claim 5 , wherein the polyamideimide film satisfies Equation 1 below:
( Tr _400 nm/ Tr _550 nm)≥0.96  [Equation 1]

wherein Equation 1 represents a transmittance ratio of a transmittance in a light having a wavelength of 400 nm to a transmittance in a light having a wavelength of 550 nm, Tr_400 nm is a transmittance at 400 nm, and Tr_550 nm is a transmittance at 550 nm.

8. The polyamideimide film of claim 7 , wherein the transmittance at 400 nm of the polyamideimide film is 85% or more.

9. The polyamideimide film of claim 5 , wherein the polyamideimide film has a Yellow index of 2.4 or less.

10. The polyamideimide film of claim 5 , wherein the cyclic aliphatic dianhydride is cyclobutane tetracarboxylic dianhydride.

11. The polyamideimide film of claim 10 , wherein the isophthaloyl dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.

Assignees

• Sk Innovation Co Ltd

Inventors

• Park Sang Yoon
• Kim Hyeon Jeong
• Park Jin Hyung
• Jang Tae Sug

Classifications

• C08G73/1078 Primary

  wholly aromatic in the diamino moiety · CPC title

• C08J2379/08

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

• C08L79/08

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

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08G73/1007 Primary

  from tetracarboxylic acids or derivatives and diamines · CPC title