Patent ID: 6455646
Filing Date: 2002-09-24
Classification: C08F

Abstract:
A process for producing a vinyl chloride polymer, comprising the steps of:(A) charging raw materials comprising vinyl chloride or a mixture of vinyl chloride and a monomer or monomers copolymerizable with vinyl chloride and water into a polymerization vessel, said vinyl chloride or the monomer mixture containing at least 0.1 ppm of a polymerization inhibitor and at least 0.01 ppm of Fe ions, (B) polymerizing the vinyl chloride or the monomer mixture thus charged in an aqueous medium, and (C) adding a hydroxycarboxylic acid compound in an amount of 50 to 1000 ppm relative to the amount of the monomer or monomer mixture to the mixture containing the monomer or monomer mixture in the polymerization vessel, at at least one step of the steps (A) and (B) above.