Patent ID: 6096482
Filing Date: 2000-08-01
Classification: C08G,G03F,G11B,H05K,Y10T

Abstract:
A method of producing a circuit substrate having an insulating layer comprising a polyimide resin by forming a coating film of a photosensitive polyimide resin precursor on a metal foil substrate, light-exposing, heating after the light-exposure, developing, and then imidizing the precursor by heating, wherein said photosensitive polyimide resin precursor is obtained by compounding polyamic acid obtained by the reaction of(A) aromatic diamines comprising(a) p-phenylene diamine and(b) 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and(B) 3,4,3',4'-biphenyltetracarboxylic acid dianhydride with a photosensitive agent.