Patent ID: 7078473

Claim:
A radical polymerization process for the preparation of a polymer of chlorinated vinyl monomer or monomers employing (A) one or more ethylenically unsaturated monomers, at least one of which is chosen from chlorinated vinyl monomers, (B) molecular iodine, and (C) one or more radical-generating agents chosen from diazo compounds, peroxides and dialkyldiphenylalkanes, which comprises the stages according to which (1) at least a fraction of each of the compounds (A), (B) and (C) is introduced into a reactor, then (2) the contents of the reactor are reacted, while introducing therein the optional balance of each of the compounds (A), (B) and (C), until: at most 70 mol % of the chlorinated vinyl monomer or monomers introduced into the reactor have reacted, if the ethylenically unsaturated monomer or monomers introduced into the reactor are exclusively chlorinated vinyl monomers, and at most 95 mol % of the chlorinated vinyl monomer or monomers introduced into the reactor have reacted, if at least one ethylenically unsaturated monomer introduced into the reactor is a nonhalogenated monomer, then (2b) the reaction is brought to an end.