Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

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Into a reactor equipped with a stirring means, a heating and cooling means and a pipe for supplying starting materials and having an internal capacity of 300 l, 125.4 kg of deionized water, 3.4 kg of sodium salt of a higher fatty acid, 680 g of sodium pyrophosphate, 255 g of 25% sodium hydroxide, 1.7 kg of styrene, 51 g of t-dodecylmercaptan, 15.3 kg of butadiene and 127.5 g of potassium persulfate were charged, and polymerization was initiated at a temperature of 67° C. During the continuous polymerization reaction at this temperature, 6.8 kg of styrene, 204 g of t-dodecylmercaptan and 61.2 kg of butadiene were continuously added to the reactor during a period of from 1 hour after the initiation to 5 hours from the initiation. The polymerization reaction was continued for 6 hours. Then, the internal temperature was raised from 67° C. to 80° C. over a period of 1 hour and a half, and the reaction was further continued for 2 hours and 30 minutes. Immediately thereafter, the internal temperature was cooled to room temperature to obtain a butadiene-styrene rubber copolymer latex. The solid content in the latex was 40.7% by weight. The average particle size of rubber contained in the latex was 0.07 μm (as measured by a nanosizer manufactured by Coulter Electronics Company, USA).

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