| 摘要 |
PURPOSE:To provide the titled compsn. having excellent heat resistance, by blending an organopolysiloxane with a specified organosilicon compd., a curing catalyst, carbon black and iron oxide. CONSTITUTION:100pts. (by weight; the same applies hereinbelow) organopolysiloxane (A) having hydroxyl group and a viscosity of 100-1,000,000cS at 25 deg.C (e.g., alpha,omega-dihydroxydiorganopolysiloxane) is blended with 0.5-25pts. organosilicon compd. (B) having at least two hydrolyzable groups per molecule, represented by formula I [wherein R<1> is a 1-8C (substd.) monovalent hydrocarbon group; X is a hydrolyzable group], e.g., a vinyloxysilane of formula II [wherein R<2> is R<1>; R<3> and R<4> are each H, a (substd.) monovalent hydrocarbon group; n is 3-4], 0.01-5pts. curing catalyst (C) [e.g., a silane or siloxane having at least one group of formula III (wherein R<5>-R<8> are each R<3> or R<4>)], 5-30pts. carbon black (D) and 0.1-10pts. iron oxide (E). |
