| abstract |
A scale deposit inhibitor for controlling the deposition of scale in a polymerizer, containing as the main component a condensate which is prepared from a phenol of the general formula (1), a 1-naphthol, and an aldehyde and is soluble in an aqueous alkaline solution: (1) [wherein R1 and R2 are each independently hydroxyl, C1-8 alkyl, halogeno, hydrogen, alkoxycarbonyl wherein the alkyl moiety has 1 to 8 carbon atoms, or phenyl, with the proviso that hydrogen atoms are present at two or more of the positions ortho and para to the hydroxyl group]. When one or more vinylic monomers are polymerized in a polymerizer having a film of the scale deposit inhibitor on its inside wall, a vinylic (co)polymer can be produced with the deposition of scale being controlled. |