Shin-etsu Chemical Co., Ltd.

Ichiro Hara

Tadashi Amano

Ryuichi Saito

Takashi Kobayashi

Yoshinori Nakahara

A process for producing a vinyl chloride polymer, including the steps of (a) subjecting a vinyl chloride monomer alone or a monomer mixture containing a vinyl chloride, to suspension polymerization in water; (b) subjecting the resultant vinyl chloride polymer slurry to stripping to remove an unreacted monomer remaining therein; and (c) dehydrating the polymer slurry having been subjected to stripping. In the polymerization step (a), the ratio of water/monomer is set in a weight ratio of from 0.80 to 1.50, and the viscosity at 20&deg; C. of the polymer slurry to be fed to the stripping step is previously kept adjusted to 0.30 Pa&middot;s or lower. In the stripping step (c), the residual unreacted monomer in the polymer slurry can efficiently be removed using steam in a smaller quantity, thus the vinyl chloride polymer can be produced at a high productivity.

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Hasaki-machi, Japan

Ichiro Hara