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US 4,126,549 AGranted
Treatment of water
AssigneeCiba Geigy (UK) Limited
InventorsThomas I. Jones, Geoffrey Graham, Michael A. Finan
Life of this patent
Estimating the term…
Abstract
A process for the prevention of scale and the inhibition of corrosion which comprises adding to water a hydrolyzed terpolymer of maleic anhydride with vinyl acetate and ethyl acrylate, the molar ratio of maleic anhydride to the other monomers being from 2.5:1 to 5:1, the ratio of vinyl acetate to ethyl acrylate being 1:1 to 2:1, and the molecular weight of the terpolymer being below 1000.
Claims9
A process for the prevention of the deposition of scale from water caused by scale forming materials in the water and the inhibition of corrosion which comprises
- adding to water 0.1 to 100 parts per million by weight of a hydrolyzed terpolymer of maleic anhydride with two ethylenically unsaturated monomers selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, aconitic acid, ethyl acrylate, methyl methacrylate, other esters of said acids, acrylonitrile, acrylamide, vinyl acetate, styrene, .alpha.-methylstyrene, methyl vinyl ketone, acrolein, ethylene and propylene, the molar ratio of maleic anhydride to the sum of the moles of the other two monomers being from 2.5:1 to 5:1, the molar ratio of the two monomers to each other being from 1:1 to 2:1, and the molecular weight of the terpolymer, measured by vapor phase osmometry in methyl ethyl ketone solution, being in the range below 1000.
Dependencies are inferred from the claim text.