| 摘要 |
Provided is a polymer scale adhesion preventive agent for use in the polymerization of a monomer having an ethylenic double bond, the polymer scale adhesion preventive agent including: (A) a condensation reaction product of an aldehyde compound and a hydroxynaphthalene-based compound, and (B) (B1) an organophosphoric acid compound, or (B2) an inorganic phosphoric acid compound having 3 or more phosphorus atoms, or a combination thereof. According to the present invention, a scale preventive coating having satisfactory scale adhesion prevention performance can be formed with a high degree of productivity via a single-stage application. Further, even if a multitude of polymerization batches are repeated under high-temperature polymerization reaction conditions, the adhesion of polymer scale to the inner wall surfaces and the like of the polymerization vessel can be effectively prevented. Moreover, because the thickness of the scale preventive agent layer can be suppressed to not more than 0.2 mm, problems such as a deterioration in the heat removal capabilities of the polymerization vessel jacket, or the problem in which detached portions of the scale preventive agent layer becoming incorporated within the polymer product, causing colored foreign matter, can be suppressed, meaning a polymer product of improved quality can be obtained.
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