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Experimental studies of the continuous emulsion polymerization of stylene were made for the purpose of examining the consistency of the authors'' theory proposed previously1). Two kinds of seeders, a plug flow type and a backmixed type, were employed prior to the main reactor to analyze the formation of polymer particles, separately from their growth. Although the number of polymer particles obtained experimentally was less than that of the theoretical value due to the presence of a small amount of impurities introduced continuously in the system, the experimental results agreed well qualitatively with those predicted from the theory.

The change in number of polymer particles formed in the continuous emulsion polymerization of styrene under operational conditions is theoretically analyzed on the basis of the authors'' kinetic data, previously obtained in a batch reactor. The phenomenon of the limit cycle observed in this continuous system is explained. It is noted that the application of "the seeder" to formation of polymer particles will be recommended in practical operations.