Patent ID: 6808818
Filing Date: 2004-10-26
Classification: B32B,H05K,Y10T

Abstract:
Fusible polyimide showing a fusion endothermic peak in a differential scanning calorimeter which has a recurring unit of the following formula (1): in which Ar1 is a mixture of residues of tetracarboxylic dianhydrides comprising 12-25 mol.% of a residue of pyromellitic dianhydride, 5-15 mol. % of a residue of 3,3â€²4,4â€²-benzophenonetetracarboxylic dianhydride, and a remaining mol. % of a residue of 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride, and Ar2 is an aromatic diamine residue comprising 1,3-bis(4-aminophenoxy)benzene.