Polymer blend for matte injection-moulded parts

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/00 (2006.01) C08F 220/14 (2006.01) C08J 5/22 (2006.01) C08L 33/12 (2006.01)

Patent

CA 2542557

The invention relates to a polymer blend comprising: a) a polymer matrix, which consists of a (meth)acrylate (co)polymer or a blend of (meth)acrylate (co)polymers with a Vicat softening temperature VST (ISO 306-B50) of at least 104 ~C and/or a (meth)acrylimide (co)polymer; b) an impact resistance modification agent, which is based on cross-linked poly(meth)acrylates and not covalently bonded to the polymer matrix a); c) between 1 and 15 wt. % plastic particles consisting of cross-linked polymers based on polymethylmethacrylates, polystyrenes and/or polysilicones. The polymer blend can be used to produce injection moulded parts with matte surfaces and Vicat softening temperatures VST (ISO 306-B50) of at least 90 ~C.

La présente invention concerne un mélange polymère contenant a) une matrice polymère qui est constituée d'un (co)polymère de (méth)acrylate ou d'un mélange de (co)polymères de (méth)acrylate présentant une température de ramollissement Vicat VET (ISO 306-B50) d'au moins 104 ·C et/ou d'un (co)polymère de (méth)acrylimide, b) un agent modificateur de la résistance aux chocs à base de poly(méth)acrylate réticulé ne présentant pas de liaison covalente à la matrice polymère a) et c) de 1 à 15 % en poids de particules de matière plastique, composées de polymères réticulés à base de polyméthacrylate, de polystyrène et/ou de polysilicone. Le mélange polymère selon cette invention permet d'obtenir des pièces moulées par injection qui présentent des surfaces dépolies et des températures de ramollissement Vicat VET (ISO 306-B50) d'au moins 90 ·C.

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