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°C of the
polymer slurry to be fed to the stripping step is previously kept
adjusted to 0.30 Pa·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.