Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-04-11
2006-04-11
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S125000, C528S128000, C528S172000, C528S173000, C528S179000, C528S183000, C528S185000, C528S220000, C528S229000, C528S176000, C528S350000, C528S353000, C528S188000, C524S600000, C524S602000, C525S420000, C525S422000, C525S432000
Reexamination Certificate
active
07026436
ABSTRACT:
The present invention relates to a polyimide adhesive composition having a polyimide derived from an aromatic dianhydride and a diamine component, where the diamine component is preferably about 50 to 90 mole % of an aliphatic diamine and about 10 to 50 mole % of an aromatic diamine. In one embodiment, the aliphatic diamine has the structural formula H2N—R—NH2wherein R is hydrocarbon from C4to C16and the polyimide adhesive has a glass transition temperature in the range of from 150° C. to 200° C.The present invention also relates to compositions comprising the polyimide adhesive of the present invention, including polyimide metal-clad laminate useful as flexible circuit when metal traces are formed out of the metal used in flexible, rigid, or flex-rigid circuit applications.
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E.I. du Pont de Nemours and Company
Hampton Hightower P.
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