Polycarbonate moulding material with better processing stability

摘要

Thermoplastic moulding materials (TMM) contains: (A) 10-90.9 wt% aromatic polycarbonate (PC), (B) 5-30 wt% graft copolymer comprising (b1) 20-80 wt% rubber-elastic polymer base with a Tg of below 0 deg C and (b2) 20-80 wt% grafted component with a Tg of above 50 deg C derived from 2 monomers (b2.1) and (b2.2), (C) 2-70 wt% thermoplastic copolymer of (c1) 50-90 wt% styrene and (c2) 10-50 wt% acrylonitrile and/or 1-8C alkyl (meth)acrylate, with a Tg of more than 50 deg C and a viscosity number of 40-160 cm<3>/g, (D) 2-70 wt% thermoplastic copolymer other than (C), containing (d1) 50-99 wt% styrene and/or substituted styrene of formula (I), and (d2) 1-50 wt% (meth)acrylonitrile, maleic anhydride, maleimide (optionally N-substituted with 1-8C alkyl or 6-20C aryl), 1-8C alkyl (meth)acrylate, (meth)acrylamide and/or 1-8C alkyl vinyl ether, (E) 0.1-25 wt% copolymer(s) of (e1) 50-99 wt% of a mixture of (e1.1) 80-100 wt% 1-10C alkyl (meth)acrylate and/or 5-8C cycloalkyl (meth)acrylate and (e1.2) up to 20 wt% 1-10C alkyl acrylate, (e2) 0.5-20 wt% maleic acid or anhydride, fumaric acid, itaconic acid and/or maleimide (optionally N-substituted as above) and (e3) 0.5-40 wt% vinylaromatic(s) (optionally ring- substituted with one or two 1-4C alkyl groups), (F) 0-12.5 wt% polymeric, hydroxyl group-containing compound(s) and (G) 0-50 wt% additives, auxiliary substances and/or fibrous and/or particulate fillers. Components (E) and (F) together make up not more than 25 wt% of the mixture. In (I), R = 1-8C alkyl or H, R' = 1-8C alkyl and n = 0, 1, 2 or 3. Also claimed are mouldings, semi- finished products and film obtained from these TMM.