Patent ID: 7041778
Filing Date: 2006-05-09
Classification: C08G

Abstract:
1. A novel polyimide resin consisting essentially of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 3,4,3′,4′-biphenyltetracarboxylic dianhydride (BPDA), 2,2 bis (3′,4′-dicarboxy phenyl) hexafluoro propane dianhydride (6FDA), 2-(3,4-dicarboxyphenyl)-1-phenylacetylene anhydride (4-PEPA) and an aromatic diamine, wherein the mole ratio of 6FDA:BTDA:BPDA:4-PEPA is 6:1:1:2 and wherein said aromatic diamine is a 1:1 mixture of m-PDA and p-PDA.