EP0122013A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polymeric additives for water
Assignee: Ecc Specialty Chemicals Inc english China Clays
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Filing: 1984-03-05
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Granted: —
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Expires: 2004-03-05
Abstract
Abstract An admixture suitable for use in inhibiting scale and corrosion in aqueous system comprises a water-soluble polymer, preferably having a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, and comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, the weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and at least one water soluble polycarboxylate, phosphonate, phosphate, polyphosphate, metal salt or sulfonates. Alos in accordance with the invention, the formation of insoluble alluvial, metal oxide and metal hydroxide deposits in an aqueous system is inhibited by adding to the system at least 0.1 mg/l of a water-soluble polymer, preferably having a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, the weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and a phosphonate.
Inventors
- 👤 Leonard J. Persinski
- 👤 Jerry L. Walker
- 👤 Bennett P. Boffardi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 01:37
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/14; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
An admixture comprising (a) a water-soluble polymer comprising at least one unsaturated monocarboxylic acid and at least one unsaturated sulfonic acid or salt of such an acid, the sulfonic acid(s) being 2-acrylamido-2-methylpropyl sulfonic acid, 2-methacrylamido-2-methylpropyl- sulfonic acid, styrene sulfonic acid, vinyl sulfonic acid, sulfoalkyl acrylate, sulfoalkyl methacrylate, allyl sulfonic acid, methallyl sulfonic acid, 3-methacrylamido-2-hydroxy-propyl sulfonic acid, and/or sulfonic acid acrylate, and the weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and (b) at least one water-soluble polycarboxylate, phosphonate, organic phosphate, organic polyphosphate, metal salt and/or sulfonate.
Claim 2
Dependent Claim
92 words
An admixture comprising (a) a water-soluble polymer comprising at least one unsaturated monocarboxylic acid and at least one unsaturated sulfonic acid or salt of such an acid, the sulfonic acid(s) being 2-acrylamido-2-methylpropyl sulfonic acid, 2-methacrylamido-2-methylpropyl- sulfonic acid, styrene sulfonic acid, vinyl sulfonic acid, sulfoalkyl acrylate, sulfoalkyl methacrylate, allyl sulfonic acid, methallyl sulfonic acid, 3-methacrylamido-2-hydroxy-propyl sulfonic acid, and/or sulfonic acid acrylate, and the weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and (b) at least one water-soluble polycarboxylate, phosphonate, organic phosphate, organic polyphosphate, metal salt and/or sulfonate.
Claim 3
Dependent Claim
57 words
An admixture as claimed in Claim 1, in which polymer (a) has a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, and the unsaturated mono-carboxylic acid is one or more of acrylic acid, methacrylic acid, a-halo acrylic acid, vinyl acetic acid, allyl acetic acid, B-carboxyethyl acrylate, and their salts.
Claim 4
Dependent Claim
51 words
An admixture as claimed in Claim 1 or 2, in which component (b) is one or more of polyacrylic acid, hydroxyethylidene diphosphonic acid, amino tri(methylene phosphonic acid), polymaleic acid or anhydride, zinc chloride, sodium polystyrene sulfonate, a copolymer of maleic anhdride and sulfonated styrene, or a copolymer of acrylamide and acrylate.
Claim 5
Dependent Claim
69 words
A method of inhibiting the precipitation of scale-forming salts in an aqueous system, comprising adding to the system at least 0.1 mg/l of an admixture as claimed in Claim 1, in which the unsaturated carboxylic acid is one or more of acrylic acid, methacrylic acid, a-halo acrylic acid, maleic acid or anhydride, itaconic acid or anhydride, vinyl acetic acid, allyl acetic acid, fumaric acid, 8-carboxyethyl acrylate, and their salts.
Claim 6
Dependent Claim
28 words
A method as claimed in Claim 4, in which polymer (a) has a weight average molecular weight of less than 25,000, as determined by low-angle laser light scattering.
Claim 7
Dependent Claim
55 words
A method as claimed in Claim 4 or 5, in which component (b) is one or more of polyacrylic acid, hydroxyethylidene diphosphonic acid, phosphinocarboxylic acid, amino tri(methylene phosphonic acid), polymaleic anhydride, zinc chloride, sodium orthophosphate, sodium polystyrene sulfonate, a copolymer or maleic anhydride and sulfonated styrene, a copolymer of acrylamide and acrylate, and mixtures thereof.
Claim 8
Dependent Claim
30 words
A method of inhibiting the corrosion of the metal in an aqueous system, comprising adding to the system at least 0.1 mg/l of an admixture as claimed in Claim 1.
Claim 9
Dependent Claim
56 words
A method as claimed in Claim 7, in which polymer (a) has a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, the carboxylic acid is acrylic acid and/or methacrylic acid and the sulfonic acid is one or more of 2-acrylamido-2-methylpropyl sulfonic acid, alkyl sulfonic acids and their salts.
Claim 10
Independent Claim
64 words
A method of inhibiting the formation of insoluble alluvial metal oxide and metal hyroxide deposits in an aqueous system, comprising adding to the system at least 0.1 mg/l of a water-soluble polymer comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and at least one phosphonate.
Claim 11
Independent Claim
64 words
A method of inhibiting the formation of insoluble alluvial metal oxide and metal hyroxide deposits in an aqueous system, comprising adding to the system at least 0.1 mg/l of a water-soluble polymer comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, weight ratio of carboxylic to sulfonic acid being in the range 1:20 to 20:1, and at least one phosphonate.
Claim 12
Dependent Claim
64 words
A method as claimed in Claim 9, in which the polymer (a) has a weight average molecular weight of less than 25,000, as determined by low-angle laser light scattering, the metal oxide or hydroxide is zinc oxide and/or chromous oxide or zinc hydroxide, and the phosphonate is one or more of hydroxyethylidene diphosphonic acid, amino tri(methylene phosphonic acid), a carboxyl phosphonate, and mixtures thereof.
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