Impact modified styrene copolymer composition comprising polysiloxane additive having improved abrasion characteristics

A thermoplastic polymer composition (P) comprising:

• (A) 82 to 99.75 wt.-% of at least one styrene-based polymer composition (A) comprising:
• (A-1) 30 to 40 wt.-%, based on the total weight of the styrene-based polymer composition (A), of at least two styrene-based graft copolymers (A-1), wherein the graft copolymer (A-1) is poly(acrylonitrile-styrene-acrylic ester) (ASA), wherein the graft copolymer (A-1) comprises at least two graft copolymers (A-1-I) and (A-1-II), wherein:
• (i) graft copolymer (A-1-I) comprises ASA rubber particles having a mean particle diameter D50 from 50 to 180 nm, and
• (ii) graft copolymer (A-1-II) comprises ASA rubber particles having a mean particle diameter D50 from 200 to 800 nm, and
• (A-2) 60 to 70 wt.-%, based on the total weight of the styrene-based polymer composition (A), of a thermoplastic polymer (A-2) comprising 40 to 60 wt.-% of polystyrene-acrylonitrile) (SAN) and 60 to 40 wt.-% poly(α-methyl styrene-acrylonitrile) (AMSAN), based on the total weight of the thermoplastic polymer (A-2);
• (B) 0.25 to 18 wt.-% of at least one organopolysiloxane compound selected from a poly(dialkylsiloxane) compound with each alkyl group independently comprising 1 to 10 carbon atoms and having a weight average molecular weight Mw of 100,000 g/mol to 1,000,000 g/mol, determined by gel permeation chromatography (GPC) relative to polystyrene as standard and THF as solvent;
• (C) 0 to 10 wt.-% of at least one colorant, dye, or pigment;
• and
• (D) 0 to 3 wt.-% of at least one further additive;
• wherein the constituents (A) to (D) sum up to 100 wt.-% of the thermoplastic polymer composition (P).