Sheet material

Details Sheet material Sheet material

1988-08-31

1990-04-10

Van Balen, William J.

Stock material or miscellaneous articles

Composite

Of epoxy ether

428414, 428422, 4284735, B32B 2704, B32B 2708, B32B 2728

Patent

active

049160176

ABSTRACT:
A composite sheet material is provided comprising a porous, expanded polytetrafluoroethylene base sheet impregnated with a first resin that has a lower heat-shrinkability than the base sheet, the impregnated base sheet having a covering layer which has a thickness of at least three (3) micrometers and which comprises a second resin whose hardening rate is lower than that of the impregnating resin. The present invention is useful in printed circuit boards wherein prepregs according to the invention are laminated with a metal sheet, a resin sheet, or another printed circuit board.

REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4133927 (1979-01-01), Tomoda
patent: 4443511 (1984-04-01), Worden et al.
patent: 4692369 (1987-09-01), Nomi

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