FILM-FORMING ORGANOPOLYSILOXANE COMPOSITION
PURPOSE:To prepare the title compsn. which gives the surface of a rubber material excellent mold releasability and lubricity by compounding a major component comprising a specific organopolysiloxane block copolymer with specific organosilanes. CONSTITUTION:The title compsn. is prepd. by compounding...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
10.03.1992
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Subjects | |
Online Access | Get full text |
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Summary: | PURPOSE:To prepare the title compsn. which gives the surface of a rubber material excellent mold releasability and lubricity by compounding a major component comprising a specific organopolysiloxane block copolymer with specific organosilanes. CONSTITUTION:The title compsn. is prepd. by compounding 50-90% organopolysiloxane block copolymer comprising resinous organopolysiloxane units of formula I (wherein R is a monovalent hydrocarbon group; and X is 1.0-1.3 on average), terminal-blocked siloxane units of formula II (wherein R is a hydrolyzable group bound to an Si atom; R is a monovalent hydrocarbon group; and (y) is 1.8-2.0), and linear organopolysiloxane units of formula III (wherein R is a monovalent hydrocarbon group), 2-50% organosilane of formula IV (wherein R to R are each a monovalent hydrocarbon group; (a) and (b) are each 0 or 1-4 provided (a+b) is 3 or 4; and (c) is 0 or 1 provided (a+b+c+d) is 4), 4-40% mixture or condensate of an epoxidized organoalkoxysilane with an alkenylated organoacetoxysilane, 0.1-10% hydroxylated or alkoxylated diorganopolysiloxane, 0-10% inorg. or org. filler, 0.1-10% condensation catalyst, and an org. solvent. |
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Bibliography: | Application Number: JP19900191122 |