Free radical bulk terpolymerizations of conjugated linoleic acid (CLA), styrene (Sty), and butyl acrylate (BA) were performed at 80 °C. Terpolymers were characterized for composition, conversion, molecular weight, and glass transition temperature. A pseudokinetic model was developed for the prediction of terpolymer composition and validated with experimental data. One impurity commonly found in CLA, oleic acid, was shown to influence the reaction kinetics significantly. The ability of oleic acid to trap electrons results in the formation of oligomeric species at the beginning of the reaction; after the oleic acid is consumed, the reaction kinetics proceed normally.