Core-shell structured silicone rubber graft polymers,...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 283/12 (2006.01) C08F 285/00 (2006.01) C08L 25/12 (2006.01) C08L 51/04 (2006.01) C08L 51/08 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2471332

The invention relates to core-shell structured silicone rubber graft polymers that comprise a core a) from a silicium-organic polymer that corresponds to the general formula (R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z, wherein x = 0 to 99.5 mole %, y = 0.5 to 100 mole %, z = 0 to 50 mole %, wherein R is the same or different and represents alkyl or alkenyl groups having 1 to 6 C atoms, aryl groups or substituted hydrocarbon groups and at last one shell c) from an organic polymer. The silicone rubber graft copolymers are obtained by producing the organic shell c) by radical polymerization at a temperature of not more than 65 ~C and adding the initiator in at least two portions to the reaction vessel, with a further addition at least 2 minutes after start of the polymerization.

L'invention concerne des copolymérisats greffés de caoutchouc de silicone à structure noyau-enveloppe présentant au moins un noyau a) en polymère silicium organique, correspondant à la formule (R¿2?Si0¿2/2?)¿x?.(RSi0¿3/2?)¿y?.(Si0¿4/2?)¿z?, x = entre 0 et 99,5 % en mole, y = entre 0,5 et 100 % en mole, z = entre 0 et 50 % en mole, R désigne des restes alkyle ou alkényle identiques ou différents ayant entre 1 et 6 atomes de C, des restes aryle ou des restes hydrocarbures substitués, ainsi qu'au moins une enveloppe c) en polymère organique. Lesdits copolymérisats greffés de caoutchouc de silicone s'obtiennent par : production de l'enveloppe organique c) par polymérisation par voie radicalaire, à une température maximale de 65 ·C et par adjonction de l'initiateur en au moins deux portions à la cuve de réaction. Une autre adjonction intervient au moins 2 minutes après le début de la polymérisation.

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