Inhibiting scale in vinyl monomer polymerization

摘要

Disclosed is a solution that comprises(A) a solvent;(B) about 0.001 to about 20 wt % of a terpolymer that comprises the condensation reaction product of(1) an aromatic compound that contains a benzene or naphthalene ring substituted with the group OR or SR, where R is hydrogen, alkyl from C1 to C15, or aryl, alkaryl, or aralkyl from C6 to C15;(2) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and(3) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound(C) about 1 to about 5 wt % of a base;(D) about 0.1 wt % to saturation of a salt; and(E) 0 to about 20 wt % of an alcohol.Also disclosed is a method of making the terpolymer in the absence of an acid catalyst and a method of inhibiting the formation of scale on reactor components in contact with polymerizing vinyl chloride monomer.