To obtain the subject polymer which is markedly improved in its mechanical strength and can be suitably used in boots and belts by subjecting only chloroprene monomer or a monomer mixture thereof with other monomers to emulsion polymerization in the presence of a specific chain transferring agent.
Only 2-chloro-1,3-butadiene monomer or a monomer mixture thereof with other monomers copolymerizable therewith is subjected to emulsion polymerization at a temperature of 5-30°C in the presence of a dialkyl xanthogene of the formula (R and R' are each 1-4C alkyl) to give a chloroprene polymer. Whereby a chloroprene polymer having improved mechanical strength which can stand the more severe application environment is obtained, as it still maintains the intrinsically basic properties of the chloroprene polymer.
KOGA MASAO
MATSUNAGA SHIRO
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