PROCESS TO STABILIZE AQUEOUS SYSTEMS, PROCESS TO REDUCE THE VISCOSITY OF CONCENTRATED WATERPROOF SUSPENSIONS OF CALIFORNIA OR CALCIUM CARBONATE AND PROCESS TO INHIBIT THE PRECIPITATION OF ZINC AND ZINC SALTS IN AQUEOUS SYSTEMS

摘要

Water-soluble polymers are provided which are useful for stabilizing aqueous systems containing scale forming salts and inorganic particulates. The polymers comprise between about 10 and about 84 weight percent of units derived from (meth)acrylic acid and/or salt thereof, greater than about 11 to less than about 40 weight percent of units derived from acrylamido alkyl and/or aryl sulfonic acid and/or salt thereof, and from at least about 5 to about 50 weight percent of units derived from one or more of vinyl esters, vinyl acetate and substituted acrylamides. These terpolymers and interpolymers, when added to an aqueous system in an effective amount provide improved phosphate, iron and zinc stabilization compared with conventional additives, while maintaining their water solubility. Certain preferred polymers also exhibit a high degree of hydrolytic stability at high pH conditions. …??Also provided are polymers formed from about 60 to about 90 weight percent (meth)acrylic acid and/or salt thereof, and from about 40 to about 10 weight percent substituted acrylamide, the polymers having a weight average molecular weight of from about 2500 to about 8000 and being unexpectedly useful as precipitation inhibitors for zinc and its salts in aqueous systems.