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US 4,711,725 AGranted
Method of stabilizing aqueous systems
AssigneeRohm and Haas Company
InventorsDavid R. Amick, William M. Hann, John Natoli
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AssigneeRohm and Haas Company
InventorsDavid R. Amick, William M. Hann, John Natoli
Estimating the term…
A process for stabilizing aqueous systems containing scale forming salts and inorganic particulates by adding to such systems an effective amount of selected low molecular weight water soluble polymers containing from about 10 to about 84 weight percent (meth)acrylic acid units, greater than 11 to less than about 40 weight percent acrylamido alkyl or aryl sulfonate units and from at least about 5 to about 50 weight percent of one or more units selected from vinyl esters, vinyl acetate and substituted acrylamides, is provided. The terpolymers and interpolymers used in the process provide improved phosphate, iron and zinc stabilization while maintaining their water solubility. Certain preferred polymers also exhibit a high degree of hydrolytic stability at high pH conditions.
A method for stablilizing an aqueous system by inhibiting the precipitation of calcium phosphate with and without the presence of iron contamination in such an aqueous system comprising adding to said aqueous system an effective amount of a water soluble polymer comprising from about 42 to about 84 weight percent (meth)acrylic acid and salts thereof, greater than about 11 to less than about 40 weight percent 2-acrylamido -2methyl propane sulfonic acid or salts thereof, and from at least about 5 to about 30 weight percent of one or more units selected from the group consisting of vinyl esters, vinyl acetate and substituted acrylamide, and where said water soluble polymer a weight average molecular weight ranging from about 3000 to about 25,000.
Dependencies are inferred from the claim text.