Patent ID: 6319597
Filing Date: 2001-11-20
Classification: B32B,H05K,Y10T

Abstract:
A polyimide composite film which comprises a polyimide substrate showing a thermal expansion coefficient of 1.times.10.sup.-5 to 2.times.10.sup.-5 cm/cm/.degree. C. in a temperature range of 50 to 200.degree. C. and a polyimide film which is bonded to the polyimide substrate and which comprises a polyimide consisting essentially of 30 to 100 molar % of the following recurring unit (A) and 70 to 0 molar % of the following recurring unit (B): ##STR5##in which R represents a tetravalent aromatic or aliphatic group and R' represents a divalent aromatic or aliphatic group wherein the polyimide film is bonded to the polyimide substrate at a bonding strength of higher than 1.3 kg/cm in terms of 90.degree. peel strength.