Patent ID: 6133408
Filing Date: 2000-10-17
Classification: B32B,C08G,C08L,C09J,H05K,Y10T

Abstract:
A polyimide resin having good thermal stability and good adhesion to a metal foil, said polyimide resin being prepared by dissolving at least one diamine in a polar aprotic solvent followed by adding at least one aromatic tetracarboxylic acid dianhydride to the solution of said aromatic diamine to prepare a polyamic acid solution, imidizing said solution to a polyimide resin by heating at a temperature above 250.degree. C., said polar aprotic solvent comprising at least 1 weight % of acetone and wherein said diamines (a) p-phenylenediamine and (b) 4,4'-oxybisbenzenamine are present in a molar ration of ((a)/(a+b)).times.100 of from 50 to 95.