Aromatic polyimide laminate sheet
AssigneeUbe Industries, Ltd.
InventorsTakahiko Sado, Hiroaki Mori
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Abstract
An aromatic polyimide laminate sheet having a relatively large thickness of 50 .mu.m or more comprises (1) at least one first film layer comprising a polymerization-imidization product of an acid component containing 80 to 100 molar % of at least one biphenyltetracarboxylic acid with an amine component containing 80 to 100 molar % of at least one aromatic diamine having two or more benzene rings, and having a glass transition point of 250.degree. C. to 350.degree. C.; and (2) at least one second film layer comprising an aromatic imide polymer, the first and second film layers being alternately laminated on and directly bonded to each other without using bonding material.
Claims14
An aromatic polyimide laminate sheet having a thickness of 50 .mu.m or more and comprising:
- (1) at least one first film layer comprising an aromatic imide polymer consisting essentially of a polymerization-imidization product of an aromatic tetracarboxylic acid component containing 80 to 100 molar % of a principal acid ingredient consisting of at least one biphenyltetracarboxylic acid compound with an aromatic diamine component containing 80 to 100 molar % of a principal diamine ingredient consisting of at least one aromatic diamine compound having two or more benzene rings, and having a glass transition temperature of from 250.degree. C. to 350.degree. C.;
- and
- (2) at least one second film layer comprising an aromatic imide polymer,
- the at least one first film layer and the at least one second film layer being alternately laminated on and directly heat-press-bonded to each other without in any way arranging a bonding material layer therebetween.
Dependencies are inferred from the claim text.