| 摘要 |
Heat-curable compsns. comprise (A) norbornane silicone block copolymers having polyorganosiloxane blocks with chemically combined SiH or SiC2H3 units, or mixts. of the units and polyimide; (B) polyfunctional organosilicon material, having at least two SiH or SiC2H3 units, from organo (poly)silanes, organo (poly) siloxanes and cyclopolyorganosiloxanes and which will undergo polyaddition reaction with (A), involving its SiH or SiC2H3 units; and (C) a platinum catalyst. Atternatively the compsns. consist of a norbornene-terminated polyimide or polyetherimide, a silicon hydride (siloxane) and a platinum catalyst. Specifically 1. (A) is a vinyl-terminated poly(nor-bornaneimide siloxane), and (B) is a silicon hydride siloxane; and 2. (A) is a norbornane-terminated polyimide or polyetherimide chain stopped with silicon hydride, and (B) a poly(vinyldiorgano-siloxane) esp. a vinyl chain-stopped polydiorganosiloxane or a vinyl-contg. cyclodiorganosiloxane.
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