Patent ID: 7754831
Filing Date: 2010-07-13
Classification: C08F,C08L,C09D

Abstract:
1. A method for producing a vinyl-based polymer, comprising the steps of: a first step of continuously feeding a material mixture comprising a vinyl-based monomer and a solvent selected from the group consisting of aromatic hydrocarbons, ketones, esters, alcohols, and mixtures thereof, to a continuous tank first reactor and polymerizing the vinyl-based monomer under conditions of a polymerization temperature of 150° to 300° C. and a retention time of 1 to 60 minutes at a rate of polymerization of 50 to 99% to obtain a reaction intermediate mixture, wherein the material mixture is continuously fed to the first reactor after preheating; and a second step of feeding a polymerization initiator in the amount of 0.01 to 5 parts by mass based on 100 parts by mass of the vinyl-based monomer and the reaction intermediate mixture to a second reactor, and further polymerizing the vinyl-based monomer under conditions of a polymerization temperature of 100° to 200° C. and a retention time of 10 to 240 minutes at a rate of polymerization of 80% or more.