Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1991-11-07
1993-04-06
Hruskoci, Peter
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
210699, 210700, 210701, 252 82, C02F 514
Patent
active
052001059
ABSTRACT:
A composition and process for preventing the deposition of scale and sludge in aqueous systems comprising adding to the system the combination of three or more additives selected from the group consisting of a) polyacrylic acid, copolymer of allylsulfonate and maleic anhydride and mixtures thereof, b) hydroxyethylidene diphosphonic acid, amino (trimethyl phosphonic acid), diethylenetriamine pentaacetic acid, and mixtures thereof, and c) copolymer of styrene sulfonate and maleic anhydride, copolymer of acrylic acid and acrylamide, poly(acrylic acid-co-hypophosphite) and mixtures thereof, and wherein the combination contains at least one additive selected from each of a), b) and c).
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Barr James P.
Hruskoci Peter
W. R. Grace & Co.,-Conn.
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