US4048066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting scale
Assignee: WR Grace and Co Conn
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Filing: 1976-11-17
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Granted: 1977-09-13
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Expires: 1996-11-17
Abstract
Abstract The invention disclosed relates to a method for using a new improved composition for inhibiting or preventing accumulation of scale or the like on heating surfaces in an aqueous system. The present composition includes (A) copolymers of styrene sulfonic acid with acrylic or methacrylic acid, and their water-soluble salts; or (B) mixture of polystyrene sulfonic acid with polyacrylic or polymethacrylic acid, and their water-soluble salts.
Inventors
- 👤 Dionisio Guerrero Cuisia
- 👤 Chih Ming Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A method for inhibiting deposits of scale, sludge, and other foulants in aqueous systems, said method consisting essentially of adding to the said systems 0.01 to 500 ppm of a composition selected from the group consisting of (A) water-soluble copolymers of styrene sulfonic acid with another polymerizable monoethylenic compound, and their water-soluble salts or (B) mixture of polystyrene sulfonic acid with an acrylic polymer whose polymer chain structure comprises units having the following formula: ##STR2## wherein R 1 is selected from the group consisting of H or CH 3 and R 2 is selected from the group consisting of H or COOH, and their water-soluble salts.
Claim 2
Independent Claim
106 words
A method for inhibiting deposits of scale, sludge, and other foulants in aqueous systems, said method consisting essentially of adding to the said systems 0.01 to 500 ppm of a composition selected from the group consisting of (A) water-soluble copolymers of styrene sulfonic acid with another polymerizable monoethylenic compound, and their water-soluble salts or (B) mixture of polystyrene sulfonic acid with an acrylic polymer whose polymer chain structure comprises units having the following formula: ##STR2## wherein R 1 is selected from the group consisting of H or CH 3 and R 2 is selected from the group consisting of H or COOH, and their water-soluble salts.
Claim 3
Dependent Claim
25 words
Method according to claim 1 in which the composition is a copolymer of styrene sulfonic acid with acrylic or methacrylic acid, including their water-soluble salts.
Claim 4
Dependent Claim
25 words
Method according to claim 1 in which the composition is a mixture of polystyrene sulfonic acid with polyacrylic or polymethacrylic acid, and their water-soluble salts.
Claim 5
Dependent Claim
22 words
Method according to claim 2 in which the styrene sulfonic acid moiety is about 2 to 98% by weight of the copolymer.
Claim 6
Dependent Claim
21 words
Method according to claim 4 in which the copolymer has a molecular weight in the range of about 800 to 7,000,000.
Claim 7
Dependent Claim
17 words
Method according to claim 4 in which the copolymer is in the form of the sodium salt.
Claim 8
Dependent Claim
22 words
Method according to claim 3 in which the polystyrene sulfonic acid portion is about 1 to 90% by weight of the mixture.
Claim 9
Dependent Claim
35 words
Method according to claim 7 in which the polystyrene sulfonic acid portion has a molecular weight of about 800 to 7,000,000 and the acrylic polymer portion has a molecular weight of about 800 to 5,000,000.
Claim 10
Dependent Claim
17 words
Method according to claim 8 in which the polymers are in the form of their sodium salts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |