摘要：

A process for the production of a vinyl chloride polymer by suspension polymerization of vinyl chloride, optionally in the presence of other vinyl monomers, in an aqueous medium, in the presence of an oil- soluble polymerization initiator, which is a combination of (A) t-butyl peroxyneoheptanoate, and (B) a peresteric peroxide, such as t-butyl peroxyneodecanoate, other than the above component (A), in a polymerization vessel having at its inner wall surface, a polymer scale deposition preventative coating, which is formed by applying an alkaline coating liquid, of (a) at least one condensation product of a quinone compound and a condensate of a quinone compound with an amino group containing diphenyl compound, and (b) at least one of the substances, a water-soluble polymer compound, an inorganic colloid or an alkali metal silicate, followed by drying the above coating. According to this process, a vinyl chloride polymer can be produced having excellent properties, such as initial coloration, in a short polymerization time, while suppressing deposition of polymer scale in the polymerization vessel.

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