Patent ID: 11965110
Assignee: NEXFLEX CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A polyimide varnish composition for a flexible substrate, the polyimide varnish composition comprising: an acid anhydride including 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and pyromellitic dianhydride (PMDA); a diamine including p-phenylenediamine (PDA) and 2-(4-aminophenyl)benzoxazole-5-amine (APBOA); and an imidazole-based curing catalyst,
wherein the BPDA and the PMDA have a molar ratio of 1:9 to 3:7,
wherein the PDA and the APBOA have a molar ratio of 7:3 to 9:1,
wherein the imidazole-based curing catalyst is contained in an amount of 5 mol % to 50 mol % based on the total mole number of the acid anhydride and diamine, and
wherein the imidazole-based curing catalyst has a boiling point of 250° C. or more and a pKa of 6.0 or more.