Flame-retardant, stress-crack resistant blends of polycarbonate/ABS

摘要

Thermoplastic moulding composition contains (A) 5-90 wt.% block copolycarbonate of (A.1) polycarbonate blocks and (A.2) 0.5-30 wt.% polyisobutylene- alpha -halo-ketocarboxylic acid blocks, which have a number average molecular weight (Mn) of 500-50000, halogen (chlorine or bromine) content of 0.1-15 wt.% w.r.t. PIB block before incorporation and acid number of 2-250 mg KOH/g; (B) 5-95 wt.% graft polymer of a mixture of (B.1.1) 50-95 parts weight styrene, alpha -methylstyrene, halogen- or methyl-ring-substituted styrene and/or 1-8 carbon (C) alkyl (meth)acrylate, esp. methacrylate and (B.1.2) 5-50 parts weight (meth)acrylonitrile, 1-8 C alkyl (meth)acrylate, maleic anhydride and/or 1-4 C alkyl- and/or phenyl-N-substituted maleimide on (B.2) 5-95 parts weight polymer based on diene and/or alkyl acrylate with a glass transition temperature -10 degrees C; (C) 0-20 wt.% rubber other than (B); (D) 0-70 wt.% copolymer of (D.1) 50-98 parts weight styrene, alpha -methylstyrene, ring-substituted styrenes and/or 1-8 C alkyl (meth)acrylates and (D.2) 50-2 parts weight (meth)acrylonitrile, 1-8 C alkyl (meth)acrylates, maleic anhydride and/or N-substituted maleimides; (E) 0-80 wt.% aromatic polycarbonate; (F) 1-20 wt.% monomeric or oligomeric phosphate or phosphonate ester with a molecular weight of 250-10000 g/mole; and (G) 0.05-5, preferably 0.1-1 wt.% fluorinated polyolefin. Also claimed are mouldings made from the composition.