A method of producing a vinyl chloride-based polymer by suspension
polymerization is provided, by which heat removal performed by a reflux
condenser can be increased, but total heat removal performed by the jacket
can be reduced, without affecting the quality of the product polymer. The
method includes commencing heat removal when or after a polymerization
conversion rate reaches 15%, and controlling said reflux condenser so as
to remove a fixed quantity of heat per unit of time depending on the
polymerization conversion rate as the polymerization process proceeds.
