Patent ID: 6288177
Filing Date: 2001-09-11
Classification: C08F

Abstract:
A process for producing a vinyl chloride polymer wherein in a polymerization vessel, vinyl chloride monomer or a vinyl monomer mixture comprised mainly of vinyl chloride monomer is polymerized by the aid of a polymerization initiator in an aqueous medium, which comprises:forming a coating film comprised of a polymer scale deposition preventive agent prior to the polymerization on the inner wall surface and other surfaces in the polymerization vessel with which said monomer or monomer mixture comes into contact during the polymerization, said coating being formed by applying to the surfaces a coating solution containing the polymer scale deposition preventive agent using steam as a carrier; andcarrying out said polymerization in the presence of a chelating agent capable of forming a Fe complex in said aqueous medium: wherein said steam has a pressure in the range of 1 to 20 kg/cm.sup.2 G (0.0981 to 1.97 MPa) and a temperature in the range of 110 to 250.degree. C.; andwherein, in said applying, a ratio of a flow rate of said coating solution to a flow rate of said steam is in the range of 0.001 to 1.0.