Water treatment polymers and methods of use thereof
AssigneeBetz Laboratories, Inc.
InventorFu Chen
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Abstract
A water soluble polymer composition is disclosed. The polymer has repeat units characterized by the structural formulae: ##STR1## wherein R.sub.1 is H or lower alkyl (C.sub.1 -C.sub.3)b; R.sub.2 is OH, OM, or NH.sub.2 ; M is a water soluble cation; R.sub.3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and D is 0 or 1. The copolymer is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion of metal parts in contact with water systems.
Claims7
A composition for providing a protective passive oxide film on the surface of a metallic part in contact with an aqueous medium with little or no attendant deposition of scale on said part, said composition comprising a water soluble polymer comprising repeat unit moieties (a) and (b) wherein said repeat unit (a) comprises the structure ##STR10## and wherein said repeat unit (b) comprises the structure ##STR11## wherein each R.sub.1 is independently H or lower alkyl (C.sub.1 -C.sub.3), R.sub.2 is OH or OM, M is a water soluble cation, R.sub.3 is a hydroxy substituted alkylene radical having from 1 to about 6 carbon atoms, X is SO.sub.3, Z is H or a water soluble cation or cations, and d is 1, the molar ratio a:b of said polymer being between about 30:1 to 1:20, a water soluble orthophosphate compound, the ratio on a weight basis of the polymer to the orthophosphate expressed as PO.sub.4.sup.-3 being from about 1:8 to 4:1, and a polyphosphate compound, the weight ratio of orthophosphate to polyphosphate on a PO.sub.4.sup.-3 to PO.sub.4.sup.-3 basis being from about 15:1 to about 1:3.
Dependencies are inferred from the claim text.