Thermoplastic moulding composition based on polycarbonate, two graft copolymers with different graft bases (ASA + AES) and copolymers containing vinyl aromatics and AN

摘要

The thermoplastic moulding composition contains, based on components A, B and C, A from 10 to 90 % by weight of at least one polycarbonate, B from 10 to 50 % by weight of at least one graft copolymer, C from 10 to 50 % by weight of at least one thermoplastic copolymer containing at least one vinylaromatic monomer having 8 to 12 carbon atoms and acrylonitrile, and is characterised in that component B comprises B1 from 30 to 70 % by weight, based on B, of a first graft copolymer built up from a1) at least one elastomer (rubber) based on a copolymer, as the graft base, containing at least ethylene and propylene, and a2) a graft shell comprising a21) at least one monoethylenically unsaturated aromatic hydrocarbon having 8 to 12 carbon atoms and a22) at least one ethylenically unsaturated monomer which is copolymerisable therewith, and B2 70 to 30 % by weight, based on B, of a second graft copolymer which has been prepared by emulsion polymerisation and is built up from b1) at least one alkyl acrylate-based elastomer (rubber) having 4 to 12 carbon atoms in the alkyl radical, and b2) a graft shell on this elastomer, comprising b21) at least one monoethylenically unsaturated aromatic hydrocarbon having 8 to 12 carbon atoms and b22) at least one ethylenically unsaturated monomer which is copolymerisable therewith.