FIELD: chemistry.
SUBSTANCE: latex is obtained through emulsion polymerisation of a monomer of a conjugated diene compound. 50-95 pts. wt monomer of the conjugated diene compound from 100 pts. wt are added together with a molecular weight regulating agent to carry out a primary reaction. The remaining amount of monomer of the conjugated diene compound is added together with the molecular weight regulating agent to carry out a secondary reaction. The ratio of the monomer of conjugated diene compound to the molecular weight regulating agent used in the secondary reaction is higher than the ratio used in the primary reaction. The secondary reaction is longer than the primary reaction. The latex has average particle diametre of 1800-5000 E, coefficient of polymerisation conversion of at least 90% and average gel content of 70-95%. The thermoplastic resin is obtained through emulsion polymerisation of 45-75 pts. wt latex, 17-40 pts. wt aromatic vinyl compound and 4-20 pts. wt vinylcyanide compound for producing graft copolymer latex. The vinylcyanide compound is selected from a group consisting of acrylonitrile, methacrylonitrile and ethacrylonitrile. The graft copolymer latex is coagulated with a coagulant at 60-80°C and held at 80-99°C to obtain powdered graft copolymer. The obtained thermoplastic resin is used in form of a mixture of graft copolymer and styrene-acrylonitrile copolymer.
EFFECT: resin and latex have excellent resistance to impact loads, chemical resistance, processing properties, excellent lustre and whiteness.
15 cl, 1 tbl, 10 ex
