摘要：

A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising:< P> (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.

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