Alkoxy functional resins and compositions containing them

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

402/30, 400/5317

C08G 77/18 (2006.01) C08G 77/50 (2006.01) C08L 83/04 (2006.01) C08L 83/14 (2006.01) C09J 183/06 (2006.01)

Patent

CA 2007659

This invention discloses MQ silicone resins having tetravalent units of the formula SiO2 and monovalent units of the formula RaR'3-aSiO1/2 wherein R' denotes a group of the general formula -R"Si(OR*)3 with R" being an alkylene group and R* an alkyl group and wherein a has a value of 2 or 3, preferably 2 for up to 30% of all monovalent units. There is also described a method of making these resins and a composition comprising hydroxy end-blocked polydiorganosiloxanes, MQ resins of the invention and a catalyst. This gives elastomer-forming compositions which have low viscosity in the uncured state whilst retaining good physical properties when cured.

L'invention porte sur des résines de silicone MQ renfermant des unités tétravalentes de formule SiO2 et des unités monovalentes de formule RaR'3-aSiO1/2, R' représentant un groupe de formule générale -R"Si(OR*)3, R" un groupe alkylène, et R* un alkyle; a est 2 ou 3, et de préférence 2 pour 30 % ou moins de toutes les unités monovalentes. L'invention décrit également une méthode pour préparer ces résines, et une composition renfermant des polydiorganosiloxanes bloqués par des hydroxyles terminaux, des résines MQ de l'invention et un catalyseur. Cela donne des compositions formant des élastomères, qui possèdent une faible viscosité à l'état non réticulé et qui conservent de bonnes propriétés physiques une fois réticulées.

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