Itaconic acid → Styrene-butadiene itaconic acid

Participants

Reaction Conditions

Reaction Steps

A styrene-butadiene-itaconic acid copolymer latex was prepared by adding to a pressure reactor with constant stirring 34.7 parts water, 1 part itaconic acid, 0.8 part of a 10% solution of Aerosol A-196 surfactant (sodium dicyclohexyl sulfosuccinate available from American Cyanamid Co., Wayne, N.J.), and 1 part of a polystyrene seed, 25 nm particle size. The mixture was heated to 165° F and 0.2 part sodium persulfate was added to initiate the reaction. Then 40 parts butadiene, 60 parts styrene, 1.0 part Sulfole 120 mercaptan (tertiary dodecyl mercaptan available from Phillips Chemical Co., a subsidiary of Phillips Petroleum Co., Bartlesville, Okla.) dissolved in styrene, an additional 0.5 part sodium persulfate, an additional 1.5 parts Aerosol A-196, 0.03 part Versene 100 (sodium ethylene diamine tetraacetate available from Dow Chemical Co., Midland, Mich.), 4 parts itaconic acid, and 58.5 parts water were added over a 6 hour period. The final mixture was heated at a temperature of 190° F for 5 hours. The resulting emulsion polymer was cooled and removed from the reactor. It had a pH value of 2.2, which was adjusted to pH 7.0 with ammonium hydroxide. Total solids were 44.1 percent. Viscosity was measured with a Brookfield Model RVF viscometer at 20 rpm and found to be 360 cps. Average particle size was 122 nm.

Provenance & Evidence