Patent ID: 9458355
Filing Date: 2016-10-04
CPC Classification: C08G,C08L,C09D,G02F

Claim Text:
1. A method of producing a polyimide coating, consisting essentially of heating a polyimide precursor coating formed by coating on a base substance, wherein the polyimide precursor coating consists of a polyamic acid solution in N,N,N′,N′-tetramethylurea, the polyamic acid solution consists of a solution resulting from the reaction of reactants consisting of a tetracarboxylic acid dianhydride component and a diamine component in N,N,N′,N′-tetramethylurea, wherein the tetracarboxylic acid dianhydride component consists of one or more compounds selected from the group consisting of pyromellitic acid dianhydride, 3,3′,4,4′-biphenyl tetracarboxylic acid dianhydride, 2,3,3′,4′-biphenyl tetracarboxylic acid dianhydride, 3,3′,4,4′-benzophenone tetracarboxylic acid dianhydride, and 3,3′,4,4′-diphenylsulfonetetracarboxylic acid dianhydride, and the polyimide precursor coating is heated at a temperature from 120° C. to 350° C.