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US4676911A
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Scale inhibitors which contain sulfate-containing polymers
Assignee: Ecolab USA Inc
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Filing: 1986-05-30
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Granted: 1987-06-30
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Expires: 2006-05-30
Abstract
Abstract A novel, water-soluble, sulfated vinyl monomer is presented; and scale-inhibiting agents are provided which are particularly effective against phosphate scale and which comprise an alkylolamide sulfate or an alkylolanilide sulfate, polymerized with an alkenyl compound such as acrylic acid or the like.
Inventors
- 👤 Dodd W. Fong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:29
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
The method of inhibiting scale formation in an industrial water system which comprises the step of adding to the water in such a system a scale-inhibiting amount a scale inhibiting agent comprising a polymer of a sulfate monomer having the general structural formula: ##STR3## wherein R 1 represents either an alkyl group having one to three carbon atoms or a hydrogen atom; wherein R 2 represents an alkyl group having one to three carbon atoms, a hydrogen atom, or an alkylol group; and wherein R 3 represents a bond, an alkylene group having one to eight carbon atoms, or a phenyl group; and an alkenyl compound having the general structural formula: ##STR4## wherein R 5 and R 6 represent either hydrogen or an alkyl group having one to three carbon atoms, and R 4 represents either hydrogen, an alkyl group having one to three carbon atoms, or a carboxylic acid group.
Claim 2
Independent Claim
151 words
The method of inhibiting scale formation in an industrial water system which comprises the step of adding to the water in such a system a scale-inhibiting amount a scale inhibiting agent comprising a polymer of a sulfate monomer having the general structural formula: ##STR3## wherein R 1 represents either an alkyl group having one to three carbon atoms or a hydrogen atom; wherein R 2 represents an alkyl group having one to three carbon atoms, a hydrogen atom, or an alkylol group; and wherein R 3 represents a bond, an alkylene group having one to eight carbon atoms, or a phenyl group; and an alkenyl compound having the general structural formula: ##STR4## wherein R 5 and R 6 represent either hydrogen or an alkyl group having one to three carbon atoms, and R 4 represents either hydrogen, an alkyl group having one to three carbon atoms, or a carboxylic acid group.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein said scale-inhibiting amount is from about 5 to about 20 p.p.m.
References Cited (Backward Citations)
US4500693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |