Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1983-04-29
1984-10-16
McCamish, Marion E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428248, 428251, 428285, 428414, 428415, 428416, 428417, 428418, 4285371, 428901, B32B 506
Patent
active
044775121
ABSTRACT:
A prepreg useful as the core in flame resistant cooper clad, composite, printed circuit boards is made by impregnating a porous substrate with an impregnant containing: either a brominated epoxy or epoxy resin and reactive flame retarding additive containing bromine and phenolic hydroxyl groups (e.g., tetrabromobisphenol A), phenolic novolac oligomer as curing agent, unsaturated epoxidized oil, and optionally, a suitable catalyst; and then heating the impregnated substrate to the "B"-stage.
REFERENCES:
patent: 3378434 (1968-04-01), Harrington
patent: 3393117 (1968-07-01), Zolg
patent: 3499821 (1970-03-01), Zinbarg
patent: 3617613 (1971-11-01), Benzinger
patent: 3804693 (1974-04-01), Nichols
patent: 3895158 (1975-07-01), Gause
patent: 4043954 (1977-08-01), Claybaker
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patent: 4311753 (1982-01-01), Pucci
patent: 4327143 (1982-04-01), Alvino
patent: 4343731 (1982-08-01), Pucci
Lee and Neville, Handbook of Epoxy Resins, 1967, Ch. 11-13 to 11-16.
Union Carbide, Flexol Plasticizer EPO, 1968, pp. 1-20.
Hickman, III Fred E.
Knight George J.
Thomas Wilbur R.
Cillo D. P.
McCamish Marion E.
Westinghouse Electric Corp.
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