Patent US4168230A successfully refreshed from Google Patents.
US4168230A
Expired / Lapsed
US
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Synergistic composition comprising phosphorylated ethoxylated glycerine and polyacrylic acid for the prevention of CaCO3 scale in cooling water
Assignee: ChampionX LLC
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Filing: 1978-06-02
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Granted: 1979-09-18
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Expires: 1998-06-02
Abstract
Abstract When certain low molecular weight polyacrylic acid salts are combined with an organic phosphate ester, an improved composition is afforded for preventing scale in industrial cooling systems.
Inventors
- 👤 George T. Farley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
171 words
A method for preventing calcium carbonate scale formation in industrial cooling water systems which comprises treating said cooling water with at least 0.5 ppm of a composition comprising (I) a water-soluble alkali metal or ammonium polyacrylate having a molecular weight between 3,000-12,000 and (II) a phosphate ester derived by reacting phosphorus pentoxide with a polyol of the formula: HO--)xR[--O(R.sub.1 O--).sub.2 CH.sub.2 CH.sub.2 OH]y wherein R is a saturated, hydrocarbon radical having two to six carbon atoms, R 1 is a member selected from the group consisting of ##STR3## x is a number average in the range of 0-5, inclusive, y is a number average in the range of 1-6, inclusive, and the sum of x plus y equals 3-6, and z is a number average in the range of 0-3, inclusive. wherein said phosphate ester is a phosphated glycerol which has been reacted with 1.5 to 2.5 moles of ethylene oxide per mol of glycerol, and said composition has a weight ratio of I:II within the range of 1:5 to 5:1.
Claim 2
Independent Claim
171 words
A method for preventing calcium carbonate scale formation in industrial cooling water systems which comprises treating said cooling water with at least 0.5 ppm of a composition comprising (I) a water-soluble alkali metal or ammonium polyacrylate having a molecular weight between 3,000-12,000 and (II) a phosphate ester derived by reacting phosphorus pentoxide with a polyol of the formula: HO--)xR[--O(R.sub.1 O--).sub.2 CH.sub.2 CH.sub.2 OH]y wherein R is a saturated, hydrocarbon radical having two to six carbon atoms, R 1 is a member selected from the group consisting of ##STR3## x is a number average in the range of 0-5, inclusive, y is a number average in the range of 1-6, inclusive, and the sum of x plus y equals 3-6, and z is a number average in the range of 0-3, inclusive. wherein said phosphate ester is a phosphated glycerol which has been reacted with 1.5 to 2.5 moles of ethylene oxide per mol of glycerol, and said composition has a weight ratio of I:II within the range of 1:5 to 5:1.
Claim 3
Dependent Claim
14 words
The composition of claim 1 where the weight ratio of I:II is about 1:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |