Multilayer substrates having at least two dissimilar...

Details Multilayer substrates having at least two dissimilar... Multilayer substrates having at least two dissimilar...

2007-10-23

2007-10-23

Lam, Cathy F. (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S473500, C174S258000, C174S259000

Reexamination Certificate

active

10706000

ABSTRACT:
The present invention relates to a multi-layer laminate having a low glass transition temperature polyimide layer, a high glass transition temperature polyimide layer, and a conductive layer.The low glass transition temperature polyimide layer is synthesized by contacting an aromatic dianhydride with a diamine component, the diamine component comprising about 50 to about 90 mole % aliphatic diamine (the remainder being aromatic diamine) having the structural formula H2N—R—NH2wherein R is hydrocarbon from C4to C16. The low glass transition polyimide is an adhesive and has a glass transition temperature in the range of from 150° C. to 200° C.The high glass transition temperature polyimide layer has a glass transition temperature above the low glass transition temperature polyimide layer and is a thermoset polyimide.A multi-layer-layer substrate of the present invention has the high glass transition temperature polyimide layer positioned between the conductive layer and the low glass transition polyimide, or optionally contains an additional low glass transition temperature polyimide positioned between the conductive layer and the high glass transition polyimide layer.

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