Patent ID: 6310024
Filing Date: 2001-10-30
Classification: C02F,C11D,C23C,C23F,C23G

Abstract:
A rust and/or scale removal composition comprising an aqueous dispersion of solids in water wherein said composition consists essentially of:I) from about 0.1 to about 40 weight percent solids; andII) from about 60 to about 99.9 weight percent water;wherein said solids comprise:a) from about 30 to about 95 weight percent of an inorganic reducing agent;b) from about 1 to about 50 weight percent of a chelating agent;c) from about 0.05 to about 5 weight percent of a low foam penetrating surfactant;d) from about 1 to about 30 weight percent of a water soluble polymeric dispersant selected from the group consisting of copolymers and terpolymers of acrylic acid/3-acrylamido, 2-methyl propyl sulfonic acid; acrylic acid/sulfonated styrene; and acrylic acid sulfophenoxy methallyl ether/maleic acid, and salts thereof, and wherein said water soluble polymeric dispersant has a weight average molecular weight ranging from about 500 to about 25,000.