FILM-FORMING ORGANOPOLYSILOXANE COMPOSITION

摘要

PURPOSE:To obtain the subject composition comfortably adhering to various rubber materials and forming film having excellent releasability and lubricity on the surface of rubber by mixing a specific organopolysiloxane block copolymer and a specific amount of organosilane, etc. CONSTITUTION:10-80wt.% resinous organopolysiloxane composed of a unit expressed by formula l (R is monofunctional hydrocarbon; X is 1-1.3) is mixed with 2-30wt.% terminal-sealed siloxane composed of unit expressed by formula II (Y is 1.8-2; R<1> is monofunctional hydrocarbon, etc.) and 10-80wt.% linear organopolysiloxane composed of a unit expressed by formula III (R<3> is monofunctional hydrocarbon containing >=80mol% methyl) and reacted to obtain organopolysiloxane copolymer. Then, (A) 50-90wt.% said copolymer is mixed with (B) 2-50wt.% organosilane (partially hydrolysate) expressed by formula IV (R<4> to R<6> are monofunctional hydrocarbon; (a) is 0 or 1) or by formula V and (C) 0.1-10wt.% diorganopolysiloxane having hydroxyl group or alkoxy group at molecular ends), etc., to afford the objective composition.