Reinforced ABS moulding materials with good matrix-filler coupling

摘要

Filler-reinforced ABS moulding materials (I) contain 4-25 wt.% tert, alkyl ester gp.-contg. graft copolymers (II) based on diene or acrylate rubbers. Also claimed is a process for the prodn. of (I), by adding (II) and the filler to the ABS components or by mixing (II) with the ABS components and adding filler to the melt. (I) consists of (A) grafted rubber and (B) thermoplastic resin based on styrene, alpha-methylstyrene, acrylonitrile, MMA and/or maleic anhydride (with total amt. of A+B = 86-15 wt.% of the mixt. (A+B)+C+D), contg. (C) 4-25 wt.% (II) and (D) 10-60 wt.% fillers; (C) is obtd. by graft copolymerisation of (C.2) 5-45 wt.% rubber particles (Tg below 0 deg.C) with a sheath (C.1) consisting of (C.1.1) styrenes, alpha-methylstyrenes, (meth)acrylonitrile, 1-4C vinylcarboxylic acids and/or (prim. or sec. 1-10C alkyl) (meth)acrylates, pref. combinations of styrene or alpha-methylstyrene and acrylonitrile, and (C.1.2) 1-12 wt.% (4-10C tert.-alkyl) (meth)acrylate(s).