Silicone release compositions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 77/20 (2006.01) C08G 77/04 (2006.01) C08G 77/18 (2006.01) C08G 77/38 (2006.01) C08L 83/07 (2006.01) C09D 183/04 (2006.01) C09D 183/07 (2006.01)

Patent

CA 2135115

A release modifier for silicone release compositions comprising a MQ resin consisting essentially of units of the formulae SiO2 (Q) and R3SiO1/2 (M) wherein R denotes a monovalent hydrocarbon group having up to 3 carbon atoms, a hydrogen atom, an alkenyl group of the formula -R1CH=CH2 or an oxyalkenyl group of the formula -OR'CH=CH2, wherein R' denotes an alkylene group of from 4 to 12 carbon atoms, provided there is at least one group -R'CH=CH2 or one group -OR'CH=CH2 present per MQ molecule and that no more than 50% of all M units have such groups. Also claimed is a solventless release composition based on siloxanes having SiH groups and a catalyst in addition to the release modifier.

Un modificateur de démoulant pour des compositions de démoulant de silicone comprenant une résine MQ constituée essentiellement de motifs des formules SiO2 (Q) et R3SiO1/2 (M) où R correspond à un groupe hydrocarboné monovalent comptant jusqu'à 3 atomes de carbone, un atome d'hydrogène, un groupe alkényle de formule -R1CH=CH2 ou un groupe oxyalkényle de formule -OR'CH=CH2, où R' correspond à un groupe alkylène de 4 à 12 atomes de carbone, pourvu qu'on compte au moins un groupe -R'CH=CH2 ou un groupe -OR'CH=CH2 par molécule de MQ et qu'au plus 50 % de tous les motifs M portent de tels groupes. On revendique également une composition de démoulage sans solvant fondée sur des siloxanes portant des groupes SiH et un catalyseur en plus du modificateur de démoulant.

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