B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/123.4
B32B 5/18 (2006.01) B29C 70/02 (2006.01) B29C 70/26 (2006.01) B32B 15/08 (2006.01) B32B 27/08 (2006.01) B32B 27/28 (2006.01) B32B 27/32 (2006.01) C08J 9/42 (2006.01) H05K 1/03 (2006.01)
Patent
CA 1294864
ABSTRACT OF THE DISCLOSURE 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.
576906
Hatakeyama Minoru
Nomi Haruo
Gowling Lafleur Henderson Llp
Japan Gore-Tex Inc.
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