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AssigneeAmerican Cyanamid Company
InventorsArthur Maurice Schiller, Richard Martin Goodman, Roger Edgar Neff
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An anionic polymer of acrylamide having a skewed molecular weight distribution such that about 60% of said polymer has a molecular weight of about 500 to 2,000 and about 10% of said polymer has a molecular weight of about 4,000 to 12,000 has been discovered. The process of manufacturing this skewed molecular weight distribution anionic polymer is described. Its use as a scale inhibitor for controlling the deposition of adherent scales on the walls of vessels or pipes, and as an anti-precipitant for keeping alkaline earth cations in solution is also described. The use of the anionic polymer of acrylamide consisting of a skewed molecular weight could be used in recirculating water systems, boilers, and in evaporative and reverse osmosis desalination systems.
A process for controlling the deposition of adherent scale on the walls of vessels or pipes in a water system, comprising adding to the water in said system an effective amount of an anionic copolymer composed of acrylate and acrylamide linkages in mole ratios of about 20:1 to about 1:1 having a skewed molecular weight distribution such that at least about 60% of said copolymer has a molecular weight of about 500 to 2,000, at least about 10% of said polymer has a molecular weight of about 4,000 to 12,000 and the remainder of said copolymer having a molecular weight of about 2000-4000 on a gel permeation chromatograph wherein the control of said scale is substantially provided by the lower molecular weight material.
Dependencies are inferred from the claim text.