Graft copolymer particles and thermoplastic resin compositions

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 291/02 (2006.01) C08F 265/04 (2006.01) C08F 265/06 (2006.01) C08F 279/02 (2006.01) C08F 283/12 (2006.01) C08L 51/04 (2006.01) C08L 55/02 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2266506

There is provided graft copolymer particles prepared by graft-polymerizing a vinyl monomer to a coagglomerated rubber, wherein said rubber is prepared by coagglomerating rubber particles of mixed latexes obtained by mixing (A) a silicone rubber latex with (B) an acrylic rubber latex and/or a conjugated dime rubber latex in such an amount as a silicone content is from 1 to 90 % by weight based on the total rubber component. A physical property of a thermoplastic resin is improved using the graft copolymer particles. The thermoplastic resin composition using the graft copolymer particles is excellent in impact resistance, weather resistance, processability, thermal discoloration resistance and appearance of molded products.

L'invention concerne des particules de copolymères greffés dont la préparation consiste à greffer un monomère vinylique sur des particules de caoutchouc que l'on obtient en mélangeant (A) un latex de caoutchouc silicone avec (B) un latex de caoutchouc acrylique et/ou un latex de caoutchouc à diène conjugué selon un rapport de nature à donner une teneur en silicone comprise entre 1 et 90 % en poids, sur la base de la quantité totale des composants en caoutchouc, et à soumettre le latex mélangé ainsi obtenu à une agrégation de particules et à une augmentation de taille. Les particules de copolymères greffés servent à modifier des résines thermoplastiques. Les compositions de résine thermoplastique contenant les particules de copolymères greffés présentent d'excellentes caractéristiques de résistance aux chocs, de résistance aux intempéries, d'aptitude à la transformation, de résistance à la décoloration thermique et d'apparence d'articles moulés.

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