PROCESS FOR PRODUCING RUBBER LATEX

摘要

A process for producing a synthetic diene rubber which comprises: adding an electrolyte capable of coagulating rubber latex particles to a polymerization system during emulsion polymerization at the time when the conversion into polymer has reached a value in the range of from 10 to 70 wt. %; and at least 30 minutes after the electrolyte addition, adding an aqueous solution of both EDTA and an iron salt wherein the molar ratio of the EDTA to the iron salt is from 4. 3 to 18. By the process, a rubber latex of satisfactory quality can be produced while attaining a high conversion into polymer in a short time without prolonging the polymerization time.