Process for preparation of resin composition useful for laminate

Details Process for preparation of resin composition useful for laminate Process for preparation of resin composition useful for laminate

1979-06-12

1981-03-31

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428245, 428249, 428251, 428271, 428273, 428298, 428901, 525134, 525332, 525384, 528159, 528205, C08G 804

Patent

active

042593956

ABSTRACT:
Process for the preparation of a resin composition which comprises reacting a polybutadiene having a number average molecular weight of 150 to 10,000 and 1,4-structure of at least 80% by weight with a phenol in the presence of an acid catalyst to obtain a composition which consists of a polybutadiene-phenol adduct and unreacted phenol, in said polybutadiene-phenol adduct, one molecule of phenol per 3 to 8 butadiene units being added to the polybutadiene, and reacting the polybutadiene-phenol adduct composition with a formaldehyde in the presence of a basic catalyst. Said resin composition thus prepared is useful for the preparation of a laminated sheet having excellent curing characteristics, particularly excellent electrical characteristics, punchability and flexibility.

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