Rubber containing resin composition

Rubber containing resin composition

Keywords Patents,Resin, Rubber

In GB Patent 2315272 Kaneka Corporation describe a rubber-containing resin composition. It is suitable as an impact modifier for styrene resins (such as styrene homopolymer and copolymers and polymer alloys thereof with other thermoplastic resins),which comprises (A) a graft copolymer having a graft ratio of 10-80 per cent by weight wherein a graft component comprising 15-60 per cent by mole of at least one vinyl cyanide compound, 40-85 per cent by mole of at least one aromatic vinyl compound and 0-30 per cent by mole of at least one other monomer copolymerizable with them is graft copolymerized onto a diene rubber having a volume average particle size of 100-1,000nm by an emulsion polymerization method; and (B) an emulsion-polymerized copolymer of 15-60 per cent by mole of at least one vinyl cyanide compound, 40-85 per cent by mole of at least one aromatic vinyl compound and 0-30 per cent by mole of at least one other monomer copolymerizable with them. This has a weight average molecular weight of 5,000-90,000 and a ratio of weight average molecular weight to number average molecular weight of 1.5-4.5, in which the ratio of the graft copolymer (A) to the copolymer (B) is from 50/50 to 95/5 by weight. A styrene resin composition comprising the rubber-containing resin composition and a styrene resin provides moulded articles having excellent properties such as impact resistance,mechanical property, heat resistance and surface appearance with good processability.