Printed circuit board base material

Details Printed circuit board base material Printed circuit board base material

1987-04-13

1988-09-13

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

174 685, 428240, 428251, 428268, 428327, 428422, 428430, 428435, 4284735, 428480, 428513, 428901, B32B 516, B32B 710, B32B 2308

Patent

active

047709227

ABSTRACT:
A base material for use in making printed circuit boards is provided wherein minute fragments of expanded, porous polytetrafluoroethylene are uniformly mixed into another resin, and the mixture is compressed to form a composite board. In use, the board has an electrically conductive circuit affixed to at least one surface. The other resin may be epoxy, polyester or other similar resin. Laminates of such base board material affixed to a glass cloth or paper sheet may be prepared. The preferred fragment size range is 0.1 to 5 mm average diameter, and the preferred volume ratio of fragments to resin is 0.5 to 2.0.

REFERENCES:
patent: 4379858 (1983-04-01), Suzuki
patent: 4454249 (1984-06-01), Suzuki et al.
patent: 4640866 (1987-02-01), Suzuki
patent: 4647508 (1987-03-01), Gagit et al.
patent: 4707565 (1987-11-01), Kasai et al.

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