Weatherable resinous composition having improved opacity and...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 51/04 (2006.01) C08J 3/24 (2006.01) C08L 13/00 (2006.01) C08L 25/12 (2006.01) C08L 25/14 (2006.01) C08F 285/00 (2006.01)

Patent

CA 2329985

A thermoplastic molding composition comprising a grafted rubber and a copolymeric matrix is disclosed. The composition is characterized in that its grafted rubber includes a substrate, a first grafted phase and a subsequent grafted phase which are sequentially grafted to said substrate. The substrate which contains a cross-linked elastomer is grafted with a first grafted phase and with a subsequent grafted phase, both phases containing copolymers of at least one vinylaromatic monomer and at least one member selected from the group consisting of (meth)acrylonitrile and alkyl (meth)acrylate. The relative ratios of the monomers making up the copolymerized phases differ one from the other. The grafted rubber is present in particulate form having a weight average particle size of about 0.1 to 1.0 microns. The composition features improved impact strength and reduced opacity.

Composition de moulage thermoplastique comprenant un caoutchouc greffé et une matrice copolymère. Cette composition est caractérisée par le fait que son caoutchouc greffé contient un substrat, une première phase greffée et une autre phase greffée, lesdites phases étant greffées audit substrat l'une après l'autre. Ce substrat, qui contient un élastomère réticulé, est greffé par une première phase greffée et par une autre phase greffée, les deux phases contenant des copolymères d'au moins un monomère vinylaromatique et d'au moins un élément sélectionné dans le groupe constitué par méthacrylonitrile et alkylméthacrylate. Les rapports relatifs des monomères constituant les phases polymérisées sont différents l'un de l'autre. Le caoutchouc greffé est présent sous forme de particules dont la dimension moyenne pondérée est située entre 0,1 et 1 micron. Cette composition possède une résistance aux chocs améliorée et une opacité limitée.

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