Method for producing vinyl ester-based copolymer

Abstract

Provided is a method for producing a vinyl ester-based copolymer comprising: polymerizing a composition comprising (i) vinyl ester, and (ii) vinyl monomer with a boiling point of 100° C. or higher to produce a copolymer paste, wherein the vinyl ester has a lower boiling point than the vinyl monomer (polymerization step), removing the vinyl ester from the copolymer paste (removing step), evaporating the vinyl monomer in an evaporator by heating the copolymer paste at a pressure of less than 1 atm (evaporation step), and discharging the copolymer paste having a viscosity of 8000 cP or more from the evaporator. By this method, unreacted vinyl monomer remained in the copolymer paste can be recovered effectively.

Dependencies are inferred from the claim text.