Ethylene Oxide → Benzene, ethenyl-, polymer with 1,3-butadiene

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A styrene-butadiene dispersion was prepared by free-radical polymerization from 6 kg of styrene, 8.4 kg of 1,3-butadiene, 3.6 kg of acrylic acid, 0.41 kg of styrene seed latex (34% by weight in water, particle size about 30 to 35 nm), 135 g of Texapon® NSO (sodium lauryl ether sulfate having on average 2.5 ethylene oxide units), 15 g of sodium hydroxide, 110 g of sodium peroxodisulfate and 18.28 kg of water at 82° C. Excess 1,3-butadiene was removed by injecting 2 bar of nitrogen into the dispersion, with stirring, after cooling the dispersion to 68° C., then releasing the dispersion from pressure and applying a slight underpressure (750 mbar absolute), and repeating this procedure in automated form about 1500 times. After 4 hours, a dispersion was obtained which had a solids content of 51.3% by weight, a pH of 4.8, and residual monomer contents of 1845 ppm of styrene and 280 ppm of acrylic acid.

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