Inhibiting scale in vinyl monomer polymerization

摘要

Disclosed is a method of inhibiting the formation of scale on reactor surfaces in contact with a polymerizing vinyl monomer comprising contacting said monomer with a terpolymer which comprises the condensation reaction product of(A) an aromatic compound that contains the groupwhere Q is OR or SR and R is hydrogen, alkyl from C1 to C15, or aryl, alkaryl, or aralkyl from C6 to C15:(B) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and(C) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound.