Polymer scale preventive agent and method of preventing polymer scale deposition using the same.

摘要

A polymer scale preventive agent for use in polymerization of a monomer having an ethylenic double bond comprising a haloethylene having the general formula (I): <CHEM> wherein X is a halogen atom, and R is a hydrogen atom or a halogen atom, said agent comprising: (A) an aromatic compound having at least one group selected from the class consisting of primary, secondary and tertiary amino groups and the quaternary ammonium group and/or a dye having at least one group selected from said class, (B) at least one compound selected from the group consisting of alkali metal salts and ammonium salts of a polyvinylsulfuric acid, and optionally (C) a naphthoquinone natural dye. The agent is coated on the inner wall surfaces, etc. of a polymerization vessel. Polymer scale deposition can be effectively prevented. e