Thermoplastic molding composition comprising components A, B and C 25 to 45 wt.-%, preferably 30 to 45 wt.-%, of a graft copolymer consisting of: 50.5 to 55 wt.-% of a graft sheath and 45 to 49.5 wt of a graft substrate - a mixture of agglomerated butadiene rubber latices (A1') and (A1") -, where and sum up to 100 wt.-%, obtained by emulsion polymerization of styrene and acrylonitrile in a weight ratio of 69.5/30.5 to 66/34 to obtain a graft sheath, it being possible for styrene and/or acrylonitrile to be replaced partially (less than 50 wt.-%) by alpha-methylstyrene, methyl methacrylate or N-phenylmaleimide or mixtures thereof, in the presence of at least one agglomerated butadiene rubber latex (A1') with a median weight particle diameter D 50 from 150 to 350 nm, and at least one agglomerated butadiene rubber latex (A1") with a median weight particle diameter D 50 of 425 to 650 nm, where the agglomerated rubber latices (A1') and (A1") are obtained by agglomeration of at least one starting butadiene rubber latex (S-A1) having a median weight particle diameter D 50 of equal to or less than 120 nm, preferably equal to or less than 110 nm, with at least one acid anhydride, preferably acetic anhydride or mixtures of acetic anhydride with acetic acid, in particular acetic anhydride; 55 to 75 wt.-%, preferably 55 to 70 wt.-%, of at least one copolymer of styrene and acrylonitrile in a weight ratio of from 70/30 to 66/34, it being possible for styrene and/or acrylonitrile to be partially (less than 50 wt.-%) replaced by alpha-methylstyrene, methyl methacrylate or N-phenylmaleimide or mixtures thereof; wherein copolymer has a melt flow rate of 30 to 36 g/10 min (220°C/10 kg); 0 to 5 wt.-% of further additives and/or processing aids; where the components A, B and, if present, C, sum to 100 wt.-%. 25 to 45 wt.-%, preferably 30 to 45 wt.-%, of a graft copolymer consisting of: 50.5 to 55 wt.-% of a graft sheath and 45 to 49.5 wt of a graft substrate - a mixture of agglomerated butadiene rubber latices (A1') and (A1") -, where and sum up to 100 wt.-%, obtained by emulsion polymerization of styrene and acrylonitrile in a weight ratio of 69.5/30.5 to 66/34 to obtain a graft sheath, it being possible for styrene and/or acrylonitrile to be replaced partially (less than 50 wt.-%) by alpha-methylstyrene, methyl methacrylate or N-phenylmaleimide or mixtures thereof, in the presence of at least one agglomerated butadiene rubber latex (A1') with a median weight particle diameter D 50 from 150 to 350 nm, and at least one agglomerated butadiene rubber latex (A1") with a median weight particle diameter D 50 of 425 to 650 nm, where the agglomerated rubber latices (A1') and (A1") are obtained by agglomeration of at least one starting butadiene rubber latex (S-A1) having a median weight particle diameter D 50 of equal to or less than 120 nm, preferably equal to or less than 110 nm, with at least one acid anhydride, preferably acetic anhydride or mixtures of acetic anhydride with acetic acid, in particular acetic anhydride; 50.5 to 55 wt.-% of a graft sheath and 45 to 49.5 wt of a graft substrate - a mixture of agglomerated butadiene rubber latices (A1') and (A1") -, where and sum up to 100 wt.-%, obtained by emulsion polymerization of styrene and acrylonitrile in a weight ratio of 69.5/30.5 to 66/34 to obtain a graft sheath, it being possible for styrene and/or acrylonitrile to be replaced partially (less than 50 wt.-%) by alpha-methylstyrene, methyl methacrylate or N-phenylmaleimide or mixtures thereof, in the presence of at least one agglomerated butadiene rubber latex (A1') with a median weight particle diameter D 50 from 150 to 350 nm, and at least one agglomerated butadiene rubber latex (A1") with a median weight particle diameter D 50 of 425 to 650 nm, where the agglomerated rubber latices (A1') and (A1") are obtained by agglomeration of at least one starting butadiene rubber latex (S-A1) having a median weight particle diameter D 50 of equal to or less than 120 nm, preferably equal to or less than 110 nm, with at least one acid anhydride, preferably acetic anhydride or mixtures of acetic anhydride with acetic acid, in particular acetic anhydride; 55 to 75 wt.-%, preferably 55 to 70 wt.-%, of at least one copolymer of styrene and acrylonitrile in a weight ratio of from 70/30 to 66/34, it being possible for styrene and/or acrylonitrile to be partially (less than 50 wt.-%) replaced by alpha-methylstyrene, methyl methacrylate or N-phenylmaleimide or mixtures thereof; wherein copolymer has a melt flow rate of 30 to 36 g/10 min (220°C/10 kg); 0 to 5 wt.-% of further additives and/or processing aids; where the components A, B and, if present, C, sum to 100 wt.-%.