Zinc laurate was a powerful but short‐lived primary stabilizer. Epoxidized soybean oil, catalyzed by a trace of zinc, was a fairly good primary stabilizer. Organic phosphite ester served primarily to prevent premature failure due to zinc; phosphite/zinc mol ratio of 4.5/1 was optimum. These combined effects are consistent with present theories of stabilizer synergism, and also suggest some further possible mechanisms. Practically, the 3‐component system offers a low‐cost, efficient, non‐toxic stabilizer for plasticized polyvinyl chloride.
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Deanin et al. (1973) studied this question.
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