Graft copolymer composition and vinyl chloride resin...

C - Chemistry – Metallurgy – 08 – L

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C08L 51/04 (2006.01) C08L 27/06 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2374962

A vinyl chloride resin composition which has excellent impact resistance and is suitable for use in the production of a pipe, window frame, joint, fence, door, switch box, etc. The resin composition contains as an impact modifier a graft copolymer composition which is obtained by blending (A) a graft copolymer which is a graft copolymer comprising a rubbery polymer having a glass transition temperature of 0~C or lower as a backbone and an alkyl methacrylate polymer as a branch and which has an average particle diameter of 0.15 µ or larger with (B) a graft copolymer which is the same as the graft copolymer (A) except that it has an average particle diameter of 0.03 to 0.13 µ.

L'invention concerne une composition de résine de chlorure de vinyle possédant une excellente résistance à l'impact et pouvant être utilisée dans la production, entre autres, d'un tuyau, d'un encadrement de fenêtre, d'un joint, d'une barrière, d'une porte, d'un boîtier d'interrupteur. Ladite composition de résine contient, en tant qu'agent antichoc, une composition de copolymère greffé obtenue par le mélange (A) d'un copolymère greffé comprenant un polymère caoutchouc possédant une température de transition vitreuse de 0 ·C ou moins, en tant que squelette, et un polymère de méthacrylate d'alkyle, en tant que ramification, et possédant un diamètre de particule moyen d'au moins 0,15 µm, avec (B) un copolymère greffé identique au copolymère greffé (A) mais possédant un diamètre de particule moyen de 0,03 à 0,13 µm.

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