摘要：

A process for producing a polymer by polymerizing in a polymerization vessel a monomer having an ethylenic double bond is provided. In this process, the polymerization vessel has a polymer scale preventive coating film on its inner wall surfaces and other surfaces with which the monomer comes into contact during polymerization. The coating film is formed by coating a coating liquid containing (A) a compound selected from the group consisting of an aromatic compound having 5 or more conjugated &pgr; bonds and a heterocyclic compound having 5 or more conjugated &pgr; bonds, and (B) a compound selected from the group consisting of an inorganic colloid, a chelate reagent, a metal compound that produces a metal ion capable of forming a complex having at least two coordination numbers, and an acid; the coating liquid being coated by means of steam as a carrier. This process can shorten the time for forming coating films of scale preventive agents to improve productivity, can improve the effect of preventing polymer scales, can make colored particles less which mix into polymer products, can lessen fish eyes and initial discoloring of formed products and can improve the quality of polymeric products and their formed or molded products.

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