| abstract |
A method for inhibiting scale formation in wholly or partly aqueousnsystems under stressed conditions characterized by a Langelier SaturationnIndex value of greater than 2.5, or a Ryznar Stability Index value of less thann4.5, said method comprising adding to the aqueous system a styrenenpolycarboxylate, said styrene polycarboxylate is prepared by solutionnpolymerizing: (i) 1 to 60 mole percent of a monomer selected from the groupnconsisting of styrene, substituted-styrene and combinations thereof, (ii) 20 to 80nmole percent of a monocarboxylic acid monomer, and (iii) 30 to 80 molenpercent of a dicarboxylic acid monomer, in the presence of a water-misciblensolvent to form a styrene polycarboxylate solution containing acid moieties,nwherein the mole percents are based on the total moles of monomer used tonprepare the styrene polycarboxylate. The styrene polycarboxylates of theninvention inhibit scale formation, and/or inhibit corrosion of metals, and/ornfacilitate dispersion of particulate matter, in aqueous systems. |