THERMOPLASTIC MOLDING MATERIAL

Thermoplastic moulding materials (I) contain: (A) 30-98 wt.% of a graft copolymer of: (ak) 30-90 wt.% rubber-elastic grafting core, obtd. by copolymerisation of: (ak1) 80-99.99 wt.% (1-10C alkyl) acrylate, (ak2) 0.01-20 wt.% crosslinking monomer, and (ak3) 0-40 wt.% other comonomer(s); and (as) 10-70 wt.% of a grafted shell derived from: (as1) 50-100 wt.% styrene cpd. of formula (a); and (as2) 0-50 wt.% other comonomer(s); (B) 1-50 wt.% of a thermoplastic polymer of: (b1) 50-100 wt.% styrene and/or alpha -methylstyrene (AMS), (b2) 0-50 wt.% acrylonitrile, and (b3) 0-50 wt.% other comonomer(s); and (C) 1-70 wt.% of a copolymer of: (c1) 30-90 wt.% styrene and AMS, (c2) 10-70 wt.% butadiene, and (c3) 0-30 wt.% other comonomer(s); comprising: (i) block X obtd. by polymerising (c2) and opt. (c3) and block Y by polymerising (c1) and opt. (c3), or (ii) a polymer with a butadiene-rich initial segment, increasing amts. of styrene along the chain, and a terminal segment of homo-polystyrene (PS); or (iii) a star-shaped polymer obtd. by linking several polymer chains contg. (c1)-(c3) with polyfunctional mols., and in which the olefinic double bonds are completely or almost completely hydrogenated. Also claimed are films and moulded prods. obtd. from (I). R , R = H or 1-8C alkyl, and/or (1-8C alkyl) (meth)acrylate.