The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 2022
Filed:
Aug. 27, 2018
Applicant:
Lg Chem, Ltd., Seoul, KR;
Inventors:
Hye Won Jeong, Daejeon, KR;
Chan Hyo Park, Daejeon, KR;
Jinho Lee, Daejeon, KR;
Jinyoung Park, Daejeon, KR;
Kyunghwan Kim, Daejeon, KR;
Ye Ji Hong, Daejeon, KR;
Danbi Choi, Daejeon, KR;
Assignee:
LG CHEM, LTD., Seoul, KR;
Primary Examiner:
Int. Cl.
CPC ...
C08L 79/08 (2006.01); C08G 73/10 (2006.01);
U.S. Cl.
CPC ...
C08L 79/08 (2013.01); C08G 73/1014 (2013.01); C08L 2201/10 (2013.01); C08L 2203/16 (2013.01); C08L 2203/20 (2013.01);
Abstract
A polyimide film according to the present invention can be effectively used as a substrate for a flexible display device without a deterioration in heat resistance even at a temperature of 350° C. or higher since a coefficient of thermal expansion (A) in the section of 100-350° C., of the polyimide film, and a coefficient of thermal expansion (B) in the section of 350-450° C., of the polyimide film, meet 0<B/A<2.