| 摘要 |
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 [E] wherein E is the repeat unit obtained after polymerization of an alpha , beta ethylenically unsaturated compound, wherein repeat unit (h) comprises the structure <IMAGE> wherein R1 and R2 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 <IMAGE> wherein R3 is a lower alkyl (C1-C3), R4 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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