Impact-resistant, chemically and heat-stable moulding materials - contain styrene butadiene block copolymer, and cyclohexyl (meth)acrylate-styrene copolymer to improve compatibility

摘要

The moulding materials (I) contain at least 20 wt.% block (A), 5-95 wt.% copolymer of cyclohexyl (meth)acrylate and up to 95 wt.% styrene (B) and 5-95 wt.% unmodified or elastomer-modifed copolymer (C) obtd. by radical polymerisation of 5-95 wt.% styrene, 5-95 wt.% acrylonitrile and up to 40 wt.% of a separately-produced elastomer with Tg below 0 deg.C; (A) is a linear or branched copolymer or a mixt. thereof, obtd. by anionic polymerisation of 40-95 wt.% styrene and 5-60 wt.% butadiene Pref., (I) contain the usual additives. (B) is pref. a blcok copolymer obtd. by anioic polymerisation, or a homopolymer of cyclohexyl (meth)acrylate or a copolymer obtd. by radical polymerisation. USE/ADVANTAGE - (I) are useful esp. for the prodn. of equipment housings, sheet, film, tubing and toys, by injection moulding, deep drawing, etc.. Incorporation of (B) as compatibility promoter reduces or prvents the loss in impact strength caused by adding S/A copolymers to SB block copolymers to improve chemical and thermal stability.