Process permitting a polymerization batch to be additionally cooled

In a process permitting a vinyl chloride batch which is to undergo polymerization in suspension, with the use of an overall quantity of water necessary for effecting the polymerization to be additionally cooled, wherein gaseous matter formed in the gas chamber of a polmerization vessel is delivered through a pipe connection communicating with the gas chamber and a reflux condenser, to the reflux condenser and condensed therein, and the resulting condensate is returned to the polymerization vessel, the improvement which comprises spraying by means of at least one nozzle structure, a liquid consisting essentially of fully desalted water into the pipe connection substantially across its entire cross section and over the entire polymerization period, the water sprayed into the pipe connection having an approximate temperature of from 5.degree. to 45.degree. C and being used in a proportion ranging from about 10 to 15% by volume, based on overall quantity of water necessary for effecting the polymerization whereby the formation of undesirable polymer deposits in the condenser is prevented.