METHOD FOR PRODUCTION OF COPOLYMERS OF BUTADIENE, ACRYLONITRILE AND VINYLIDENE CHLORIDE Russian patent published in 1997 - IPC

FIELD: production of emulsion rubbers. SUBSTANCE: method is carried out by water-emulsion copolymerization of butadiene, acrylonitrile and vinylidene chloride at their mass ratio 10-25:10-20:55-80 respectively. The process takes place in the presence of emulsifier, radical initiator and hydroperoxide of pinane, their quantities being 0.05-0.30 mass parts per 100 mass parts of monomers. Acrylonitrile is fed by steps: 56-85 mass % of acrylonitrile are fed at the beginning of the process, 10-33 mass % are fed when conversion of monomers is 20-30 mass % and 5-11 mass % of acrylonitrile are fed at conversion of monomers 40-55 mass %. Additionally butadiene is fed (its quantity being 5-10 mass parts per 100 mass parts of monomers) when conversion of monomers is 28-32 mass %. Quantity of mentioned above emulsifier is 0.5-1.5 mass % per 100 mass parts of monomers. EFFECT: improves efficiency of the method. 3 tbl