METHOD FOR PRODUCING VINYL CHLORIDE-BASED COPOLYMER RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method for production by which the time to recover the residual vinyl chloride monomer of a vinyl chloride-based copolymer resin prepared by copolymerizing a vinyl chloride-based monomer with a macromonomer is shortened and the outflow of a slurry to the outside of a polymerizer is reduced. SOLUTION: The method for producing the vinyl chloride-based copolymer resin is carried out as follows. An aqueous dispersion in which the ratio of the vinyl chloride-based monomer to the total amount of constituent monomer components is≥50 to <100 wt.% is prepared so that the total weight (M) of the macromonomer and the vinyl chloride-based monomer and the initial amount (H) of water are within the range of formula (1) 00 to≤0.1 pt.wt. based on 100 pts.wt. of the total amount of the charged monomers. A water-soluble polymerization inhibitor in an amount to be≥0.0001 to≤0.001 pt.wt. is then charged. The macromonomer is subsequently dispersed in the initial water and the vinyl chloride-based monomer is charged. COPYRIGHT: (C)2008,JPO&INPIT