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 35.5 parts water, 0.5 parts itaconic acid, 0.7 parts of a 10 percent solution of Aerosol A-196 surfactant and 0.5 parts of a polystyrene seed, 25 nm particle size. The mixture was heated to 150° F. and 0.3 parts sodium persulfate was added to initiate the reaction. Then 40 parts butadiene, 60 parts styrene, 1.0 part Sulfole 120 mercaptan, dissolved in styrene, an additional 1.5 parts of 10 percent Aerosol A-196, 0.03 parts Versene 100, and 4 parts MAGME-100 were added over a 6 hour period. The final mixture was heated at 170° F. for 6 hours. The resulting emulsion had a pH value of 3.2, 46.3 percent solids and a viscosity of 54 cps. After adjustment to pH 7 with ammonium hydroxide, it had a total solids content of 46.6 percent and a viscosity of 75 cps. One part of the solution polymer of Example 1 was added as well as varying quantities of ammonium chloride. The results are shown in Table 3 below. Each value is the percentage change of wet tensile strength compared to a control binder which contained no ammonium chloride. In every case the binder containing ammonium chloride had less wet tensile strength than the control.

Provenance & Evidence