Transparent, impact-modified PMMA-mouldings with improved low temperature impact resistance and high weathering stability

摘要

Thermoplastic moulding compositions containing A) a polymer based on polymethyl methacrylate and obtainable by polymerising a monomer mixture of methyl methacrylate, at least one compound selected from the group consisting of C1-C20-alkyl acrylates and C5-C8-cycloalkyl acrylates, at least one further monofunctional comonomer and a transfer regulator, and B) a graft copolymer obtainable by b1) emulsion polymerisation of a monomer mixture of methyl methacrylate, at least one graft-crosslinking monomer, at least one monofunctional, ethylenically unsaturated comonomer, and at least one di- or polyethylenically unsaturated comonomer, b2) subsequent emulsion polymerisation, in the presence of the emulsion polymer obtained in step b1), of a monomer mixture of at least one C1-C20-alkyl acrylate, at least one phenyl-C1-C4-alkyl acrylate, at least one vinylaromatic monomer, at least one graft-crosslinking monomer, at least one compound selected from the group consisting of methyl methacrylate and a monofunctional, ethylenically unsaturated monomer, and at least one di- or polyethylenically unsaturated comonomer, and b3) subsequent emulsion polymerisation, in the presence of the emulsion polymer obtained in step b2), of a monomer mixture of methyl methacrylate, a monofunctional, ethylenically unsaturated comonomer and a transfer regulator. o