Polymer scale preventive agent, polymerization vessel effective in preventing polymer scale deposition, and process of producing polymer using said vessel

摘要

A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising: (A) at least one compound selected from the group consisting of diaminobenzenes and diaminonaphthalenes, (B) a hydroxynaphthoquinone, and (C) an acid. The polymerization vessel having a coating comprising the polymer scale preventive agent on its inner wall, etc. is effective in preventing deposition of polymer scale, and the polymeric product has a high whiteness and is of high quality.