Transparent and impact-resistant thermoplastic resin...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 25/14 (2006.01) C08L 9/06 (2006.01) C08L 25/12 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2500292

An impact-resistant thermoplastic resin composition improved in transparency, which comprises (A) 5 to 40 parts by weight of a graft copolymer produced by grafting at least one monomer selected from among alkyl methacrylates, aromatic vinyls, and vinyl cyanide onto enlarged rubber particles obtained by the aggregation and enlargement of a styrene/diene rubber latex by the use of a latex of a copolymer having acid groups which copolymer comprises an unsaturated acid, an aromatic vinyl, and an alkyl acrylate as the essential components and is controlled in refractive index and (B) 95 to 60 parts by weight of a copolymer obtained by polymerizing at least one monomer selected from among aromatic vinyls, alkyl methacrylates, and vinyl cyanide.

L'invention concerne une composition de résine thermoplastique résistante aux chocs présentant des propriétés de transparence améliorées et comprenant (A) entre 5 et 40 parties en poids d'un copolymère greffé produit par greffage d'au moins un monomère choisi parmi des méthacrylates d'alkyle, des vinyles aromatiques et du cyanure de vinyle sur des particules de caoutchouc élargies obtenues par agrégation et élargissement d'un latex de styrène/caoutchouc diénique au moyen d'un latex d'un copolymère renfermant des groupes acides, ce copolymère comprenant un acide insaturé, un vinyle aromatique et un acrylate d'alkyle comme constituants essentiels, et présentant un indice de réfraction régulé. En outre, ladite composition comprend (B) entre 95 et 60 parties en poids d'un copolymère obtenu par polymérisation d'au moins un monomère choisi parmi des vinyles aromatiques, des méthacrylates d'alkyle et du cyanure de vinyle.

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