Laminate and process for producing the same

Details Laminate and process for producing the same Laminate and process for producing the same

2006-02-14

2006-02-14

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S317100, C526S347000

Reexamination Certificate

active

06998455

ABSTRACT:
This invention relates to a laminate which changes in dimension to such a small extent as not to cause curling and warpage when the ambient humidity changes and is useful for flexible printed wiring boards. The laminate possesses a polyimide layer or layers of polyimides formed on a conductor by coating and at least one of the polyimide layers is composed of polyimide of low hygroscopic expansion obtained by the reaction of diamines containing 20 mol % or more of 4,4′-diamino-2,2′-dimethylbiphenyl with a tetracarboxylic acid compound and exhibiting a coefficient of linear hygroscopic expansion of 15×10−6/% RH or less.

REFERENCES:
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International Search Report PCT/JP00/07330 mailed on Jan. 23, 2001.

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