Functionalised polyorganosiloxanes and one method for...

C - Chemistry – Metallurgy – 08 – G

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C08G 77/38 (2006.01) C07F 7/08 (2006.01) C07F 7/21 (2006.01) C08G 77/385 (2006.01) C08G 77/50 (2006.01) C08L 83/06 (2006.01) C08L 83/08 (2006.01)

Patent

CA 2204919

Multifunctionalised polyorganosiloxanes including, per molecule, .alpha. at least one functional siloxyl unit (I) (R)¿a?YSi(O)¿(3 - a)/2?, wherein R is particularly a C¿1-6? alkyl radical, Y is a C¿1-15? alkoxyl radical and a is 0, 1 or 2; .beta. at least one other functional siloxyl unit (II) (R)¿b?WSi(O)¿(3 - b)/2?, wherein W is hydrogen or a group connected to the silicon via a Si-C bond and selected from an alkyl, aralkyl or halogenated or polyhalogenated aryl group; a polyether oxide group; en epoxidised alkyl group; an alkoxyalkyl group; a hydroxylated, carbonylated or esterified alkyl group; a phenol group; and an alkoxysilyl group; and .gamma. optionally at least one unit (III) (R)¿c?(H)¿d?Si(O)¿((4 - (c + d))/2?, wherein c is 0, 1, 2 or 3, d is 0 or 1 and c + d <= 3. The alkoxyl functionality Y is inserted onto a suitable polyhydrogenoorganosiloxane by means of a dehydrogenation/condensation reaction from the alcohol from which Y is derived. Then the non-hydrogeno functionality W is inserted by means of a hydrosilylation reaction from the olefin compound from which W is derived. Said multifunctionalised polyorganosiloxanes may be used as anti-adherence modulators in silicone compositions.

La présente invention concerne des polyorganosiloxanes multifonctionnalisés comprenant par molécule: .alpha. d'une part au moins un motif siloxyle fonctionnel (I) (R)aYSi(O)(3 - a)/2), où R est notamment un radical alkyle en C1-C6, Y est un radical alcoxyle en C1-C15 et a = 0, 1 ou 2; .beta. d'autre part au moins un autre motif siloxyle fonctionnel (II) (R)bWSi(O)(3 - b)/2, où W est l'hydrogène ou un groupe, relié au silicium par une liaison Si-C, choisi parmi les groupes: alkyle, aralkyle ou aryle halogéné ou polyhalogéné; polyéther-oxyde; alkyle époxydé; alcoxyalkyle; alkyle hydroxylé, carbonylé ou estérifié; phénolique; et alcoxysilyle; .gamma. et éventuellement au moins un motif (III) (R)c(H)dSi(O)((4 - (c + d))/2, où c = 0, 1, 2 ou 3, d = 0 ou 1 et c + d <= 3. La fonctionnalité alcoxyle Y est introduite sur un polyhydrogénoorganosiloxane approprié par une réaction de déshydrogénocondensation à partir de l'alcool dont dérive Y, puis la fonctionnalité W non hydrogéno par une réaction d'hydrosilylation à partir du composé oléfinique dont dérive W. Les polyorganosiloxanes multifonctionnalisés peuvent être utilisés à titre de modulateurs d'antiadhérence dans les compositions silicones.

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