Patent ID: 6433074
Filing Date: 2002-08-13
Classification: C08F,C08K

Abstract:
A process for producing a vinyl chloride polymer, comprising: polymerizing, in an aqueous medium, a starting material comprising a vinyl chloride monomer alone or a mixture of a vinyl chloride monomer and a monomer copolymerizable with the vinyl chloride monomer, and adding an antioxidant to the starting material or the polymerization reaction mixture;said antioxidant comprising a mixed antioxidant comprised of an antioxidant A which is liquid at 20Â° C. and has the formula: â€ƒR1 is t-butyl, t-amyl or isopropyl and R2 and R3 are each hydrogen, t-butyl or sec-butyl and an antioxidant B which is powdery at 20Â° C., wherein antioxidants A and B are mixed in a weight ratio A/B ranging from 9/1 to 2/8.