High impact thermoplastic blend useful for injection moulding - contains hard styrene!-acrylonitrile! copolymer, graft ABS and graft acrylic!-ester! copolymer

摘要

Polymer blend is based ona hard component (A) and 2 graft copolymers (b) and (c). (A) consists of copolymer(s) of styrene and/or alpha-methylstyrene with 20-40 wt. % acrylonitrile (AN); (b) of (Bl) 40-80 (50-60)% butadiene polymer of average particle size 0.20-0.45 (0.26-0.35) mu m and (B2) 20-60 (40-50)% grafted mixt. of styrene and AN in 75:25 to 65:35 ratio; and (c) of (Cl) 40-80 (70-60)% crosslinked acrylic ester polymer, with Tg below 0 degree C and average particle size 0.05-0.15 (0.06-0.08) mu m, and (C2) 20-60 (30-40)% grafted mixt. of styrene and AN in 75:25 to 65:35 ratio. The ratio of (B1) to (Cl) is 70:30 to 30:70 (60:40 to 50:50) and the amt. of (B1 + Cl) in the blend ca. 10-35 (15-30)%. The blend can also contain conventional additives, esp. ethylene and/or propylene oxide polymer or a dyestuff or coloured pigment. Mouldings with high (cold) impact strength and good surface structure and good processing properties are obtd..