Emulsionfree produced ABS moldings with very high notch impact strength

摘要

Graft copolymer moulding materials of the ABS type (I), containing: (A) 30-80 pts. wt. graft copolymer obtained by solution polymerisation, with a rubber content of 20-50 wt% and an average particle diameter (d50) of 80-600 nm in the rubber phase, (B) 5-50 pts. wt. ABS polymer obtained by bulk, solution or suspension polymerisation, containing 3-18 wt% rubber with a d50 of 700-15000 nm, and (C) 5-70 pts. wt. thermoplastic resin obtained by bulk, solution or suspension polymerisation of vinyl monomers in the absence of rubber. Preferably (I) contains (A) 35-75 (preferably 40-70) pts. wt. ABS copolymer made by solution polymerisation, containing 22.5-45 (preferably 25-40) wt% rubber with a d50 of 150-400 (preferably 200-350) nm, (B) 7.5-45 (preferably 10-40) pts. wt. ABS obtained by bulk, solution or suspension polymerisation, containing 5-16.5 (preferably 7.5-15) wt% rubber with a d50 of 800-10,000 (preferably 1000-5000) nm and (C) 7.5-65 (preferably 10-60) pts. wt. resin as above. Component (A) is obtained by radical polymerisation of a monomer mixture containing (D) 90-20 pts. wt. aromatic mono-alkenyl compound, (E) 10-50 pts. wt. unsaturated nitrile and (F) 0-30 pts. wt. other comonomers in presence of 15-50 pph (pts. wt. per 100 pts. wt. monomers) of a soluble, gel-free butadiene polymer or butadiene/styrene copolymer and 50-200 pph solvent.