Patent ID: 6579937
Filing Date: 2003-06-17
Classification: C08F,C08L

Abstract:
A thermoplastic molding composition comprising(A) from 5 to 98% by weight, based on the total weight of the molding composition, of an elastomeric graft copolymer built up from (a1) from 30 to 90% by weight, based on (A), of a graft base with a glass transition temperature (Tg) below âˆ’10Â° C. made from (a11) an at least partially crosslinked acrylate polymer formed from (a111) from 50 to 99.9% by weight, based on (a11), of at least one C1-C10-alkyl acrylate, (a112) from 0.1 to 5% by weight, based on (a11), of at least one polyfunctional crosslinking monomer and (a113) from 0 to 49.9% by weight, based on (a11), of at least one further monomer which is copolymerizable with (a111) selected from the group consisting of the vinyl C1-C8-alkyl ethers, butadiene, isoprene, styrene, acrylonitrile and methacrylonitrile, and/or methyl methacrylate and/or (a12) a diene polymer built up from (a121) from 60 to 100% by weight, based on (a12), of at least one diene and (a122) from 0 to 40% by weight, based on (a12), of further copolymerizable monomers selected from the group consisting of the C1-C10-alkyl acrylates, vinyl C1-C8-alkyl ethers, butadine, isoprene, styrene, acrylonitrile and methacrylonitrile, and/or methyl methacrylate, (a2)from 10 to 70% by weight, based on (A), of a graft with a (Tg) above 50Â° C., grafted onto the graft base an built up from (a21) from 50 to 95% by weight, based on (a2), of at least one vinylaromatic monomer, (a22) from 5 to 50% by weight, based on (a2), of at least one polar, copolymerizable comonomer selected from the group consisting of acrylonitrile, methacrylonitrile, C1-C4-alkyl (meth)acrylates, maleic anhydride and maleimides, and (meth)acrylamide, and/or vinyl C1-C8-alkyl ethers, or a mixture of these, (B) from 1 to 90% by weight, based on the total weight of the molding composition, of a copolymer composed of (b1) from 50 to 99% by weight, based on (B), of at least one vinylaromatic monomer and (b2) from 1 to 50% by weight, based on (B), of monomers as described for (a22), (C) from 1 to 70% by weight, based on (A), (B), (C) and optionally (D), of a block copolymer composed of at least one block CA forming a hard phase and having copolymerized units of a vinylaromatic monomer and at least one elastomeric block C(B/A) forming a soft phase and having copolymerized units of a vinylaromatic monomer, and also of a diene, where the glass transition temperature (Tg) of the block CA is above 25Â° C. and that of the block C(B/A) is below 25Â° C., and the selected phase-volume ratio of block CA to block C(B/A) is such that the proportion of the hard phase in the entire block copolymer is from 1 to 40% by volume and the proportion by weight of the diene in the entire block copolymer is less than 50% by weight, where the proportion of 1,2-linkages in copolymerized diene units, based on the total of 1,2- and 1,4-cis/trans linkages of the copolymerized diene units, is below 15%, and (D) from 0 to 300% by weight, based on the weight of components (A) to (C), of a polycarbonate, (E) from 0 to 30% by weight, based on the total weight of the molding composition, of conventional additives and processing aids.