Composition for treating aqueous mediums

Claim 1

Composition for controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said composition also being adapted for dispersing solids particulate matter, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, said solids particulate matter being selected from the group consisting of iron oxide and clay, said composition comprising an effective amount for the purpose of a water soluble polymer (I) comprising moieties (a) derived from an acrylic acid or water soluble salt thereof, and moieties (b) of an hydroxylated lower alkyl acrylate, wherein the moieties of the polymer have the following formula ##STR10## wherein R is hydrogen or a lower alkyl of from about 1 to 3 carbon atoms, R 1 is OH, OM, or NH 2 where M is a water soluble cation, R 2 is a lower alkyl group of from about 2-6 carbon atoms and the molar ratio of x:y is about 34:1 to 1:4, and an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) having the formula: ##STR11## wherein a or b may be zero or a positive integer, with the proviso that (a+b) must be >1, d=H or HSO 3 .