Patent ID: 6699572
Filing Date: 2004-03-02
Classification: B32B,C08G,C08J,C08L,H05K,Y10T

Abstract:
A metal film/aromatic polyimide film laminate comprising a composite aromatic polyimide film and a metal film, in which the composite aromatic polyimide film is composed of an aromatic polyimide substrate film having a linear expansion coefficient of 5Ã—10âˆ’6 to 30Ã—10âˆ’6 cm/cm/Â° C. in the temperature range of 50 to 200Â° C., the coefficient being a value measured in a machine direction of the substrate film, and a thin thermoplastic aromatic polyimide layer having a thickness less than the thickness of the aromatic polyimide substrate film and comprising polyimide prepared from a carboxylic acid component comprising a mixture of 3,3â€²,4,4â€²-biphenyltetracarboxylic dianhydride and 2,3,3â€²,4â€²-biphenyltetracarboxylic dianhydride in a molar ratio of 50:50 to 90:10 and an aromatic diamine component comprising 1,3-bis(4-aminophenoxy)benzene or a mixture of 1,3-bis(4-aminophenoxy)benzene and at least one diamine component selected from the group consisting of p-phenylenediamine and diaminodiphenyl ether in a molar ratio of 10/90 or more, the polyimide of the thin aromatic polyimide layer having a glass transition temperature of 210 to 310Â° C., and the metal film being fixed to the thin aromatic polyimide layer at a 90Â° peel resistance of 0.5 kg/cm or higher, while the thin polyimide layer being bonded to the polyimide substrate film at a 90Â° peel resistance higher than the peel resistance between the metal film and the thin polyimide layer.