Polyamide-imides, graphite films and preparation for the graphite film

Patent metadata

Field	Value
Publication number	US-9371233-B2
Application number	US-201414484430-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Dec 17, 2013
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A polyamide-imide represented by the following formula

is provided. A graphite film prepared by performing a thermal treatment process on the polyamide-imide represented by the above-mentioned formula is also provided. In the thermal treatment process, the temperature range of the thermal treatment process ranges from 25° C. to 2,900° C.

First claim

What is claimed is:

1. A polyamide-imide, represented by the following formula (I):

wherein,
m:n=8:2-6:4; and X 1 and X 2 are defined as one of (1), (2) or (3) as follows:
(1) X 1 is

 and X 2 is a combination of

 a combination of

 or a combination of

(2) X 1 is

 and X 2 is a combination of

 or
(3) X 1 is

 and X 2 is a combination of

2. The polyamide-imide as claimed in claim 1 , wherein m:n=7.5:2.5-6.5:3.5.

3. A graphite film comprising a polyamide-imide, represented by the following formula (I), prepared by performing a thermal treatment process on the polyamide-imide, wherein the temperature range of the thermal treatment process ranges from 25° C. to 2,900° C.:

wherein,
m:n=8:2-6:4; and X 1 and X 2 are defined as one of (1), (2) or (3) as follows:
(1) X 1 is

 and X 2 is a combination of

 a combination of

 or a combination of

(2) X 1 is

 and X 2 is a combination of

 or
(3) X 1 is

 and X 2 is a combination of

4. A method for preparing a graphite film, comprising:
performing a thermal treatment process on a polyamide-imide film to turn into a graphite film, wherein the range of the thermal treatment process
temperature is from 25° C. to 2,900° C., and the polyamide-imide is represented by the following formula (I):

wherein,
m:n=8:2-6:4; and X 1 and X 2 are defined as one of (1), (2) or (3) as follows:
(1) X 1 is

 and X 2 is a combination of

 a combination of

 or a combination of

(2) X 1 is

 X 2 is a combination of

 or
(3 ) X 1 is

 and X 2 is a combination of

5. The method for preparing a graphite film as claimed in claim 4 , wherein the thermal treatment process comprises a carbonization process and a graphitization process.

6. The method for preparing a graphite film as claimed in claim 5 , wherein the temperature of the carbonization process ranges from 25° C. to 1,300° C.

7. The method for preparing a graphite film as claimed in claim 5 , wherein the temperature of the graphitization process ranges from 1,800° C. to 2,900° C.

8. The method for preparing a graphite film as claimed in claim 5 , further comprising utilizing nitrogen gas, hydrogen gas, argon gas or helium gas in the carbonization process.

9. The method for preparing a graphite film as claimed in claim 5 , further comprising utilizing argon gas, hydrogen gas or helium gas in the graphitization process.

Assignees

• Ind Tech Res Inst

Inventors

• Lin Chen-Lung
• Liu Yen-Chun
• Chang Hui-Wen
• Chiou Kuo-Chan
• Hu Hsien-Lin

Classifications

• C09D179/08

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

• C08G73/1042

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

• C08G73/14 Primary

  Polyamide-imides · CPC title

• C01B32/205

  Preparation · CPC title

• C08G73/1053

  with oxygen only in the tetracarboxylic moiety · CPC title