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Abstract

A water soluble terpolymer useful in controlling deposition of scale in aqueous systems comprised of monomeric repeat units (g), (h) and (i) wherein repeat unit (g) comprises the structure ##STR1## wherein E is the repeat unit obtained after polymerization of an .alpha.,.beta. ethylenically unsaturated compound, wherein repeat unit (h) comprises the structure ##STR2## wherein R.sub.1 and R.sub.2 are the same or different and denote H, methyl or ethyl and M is a water soluble cation or H, and wherein repeat unit (i) comprises the structure ##STR3## wherein R.sub.3 is H or a lower alkyl (C.sub.1 -C.sub.3), R.sub.4 is a hydroxy substituted alkyl or alkylene group having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene group having from 1 to about 6 carbon atoms, X is an anionic radical, Z is H, hydrogen atoms or a water soluble cation or cations which together counterbalance the valance of X and a is 0 or 1.

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First Claim