Thermoplastic molding materials containing a mixture of (A) from 15 to 70% by weight of a methacrylate polymer, (B) from 10 to 50% by weight of a copolymer obtained by polymerization of a mixture of (B1) a vinylaromatic monomer and (B2) a vinyl cyanide, (C) from 20 to 50% by weight of a graft copolymer of (C1) 50-80% by weight of a core of (C11) from 50 to 100% by weight of a 1,3-diene and (C12) from 0 to 50% by weight of a vinylaromatic monomer and (C2) 20-50% by weight of a graft shell of (C21) a C.sub.1 -C.sub.8 -alkyl ester of methacrylic or acrylic acid and (C22) a vinylaromatic monomer, with the proviso that the medium particle size (d.sub.50) of the graft copolymer is chosen in the range from 40 to 500 nm, and (D) from 0.5 to 15% by weight of a crosslinked methacrylate polymer.