Patent ID: 7060751
Filing Date: 2006-06-13
Classification: C08F,C08L

Abstract:
1. A thermoplastic molding composition comprising a graft polymer that contains: a) a continuous phase containing the polymerized product of at least one vinylaromatic monomer and at least one ethylenically unsaturated nitrile monomer, and b) a disperse phase containing ethylene/α-olefin rubber that is grafted with the polymerization product of at least one vinylaromatic monomer and at least one ethylenically unsaturated nitrile monomer wherein the weight average molecular weight of the continuous phase is 130,000 to 275,000 g/mole and where the disperse phase is characterized in that its weight average particle size is less than 0.90 μm, its degree of grafting (measured by gel value measurement in acetone as solvent) is 0.25 to 0.65, the ratio of the gel value measured in THF to the gel value measured in acetone is less than 0.1 and the glass transition temperature of the ethylene/α-olefin rubber (determined by measuring the complex shear modulus as a function of the temperature) is less than −50° C.