The present invention relates to a molding composition comprising (A) from 30 to 85% by weight of a copolymer containing at least one α,β-unsaturated monocarbonitrile in amounts of at least 30% by weight, and at least one aromatic vinyl monomer, as component (A), (B) from 10 to 40% by weight of a graft rubber with an average particle size of from 100 to 280 nm, comprising a graft base b1, composed of at least one α,β-unsaturated monocarboxylic ester, and at least one graft shell b2, composed of at least one aromatic vinyl monomer and of at least one α,β-unsaturated monocarbonitrile, as component (B), (C) from 5 to 30% by weight of a graft rubber with an average particle size of from 410 to 1000 nm, comprising a graft base c1, composed of at least one α,β-unsaturated monocarboxylic ester, and at least one graft shell c2, composed of at least one aromatic vinyl polymer and of at least one α,β-unsaturated monocarbonitrile, as component (C), and wherein the ratio by weight of component (B) to component (C) is in the range from 3:1 to 1:1, and the content of the α,β-unsaturated monocarbonitrile in component (B), in % by weight, and in component (C), in % by weight based on the total weight of the graft shell c2, is in each case from 5 to 10 percentage points below the content of α,β-unsaturated monocarbonitrile in component (A), in % by weight based on the total weight of component (A). The invention also relates to the process of producing the molding composition and its use.