Inhibiting scale in vinyl monomer polymerization
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United States of America Patent
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Oct 9, 2001
Issued Date -
N/A
app pub date -
Jan 4, 2000
filing date -
Aug 10, 1998
priority date (Note) -
Expired
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Abstract
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 group ##STR1## where Q is OR or SR and R is hydrogen, alkyl from C.sub.1 to C.sub.15, or aryl, alkaryl, or aralkyl from C.sub.6 to C.sub.15 : (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.
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