Patent US4510059A successfully refreshed from Google Patents.
US4510059A
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US
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Carboxylic functional polyampholytes as silica polymerization retardants and dispersants
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1984-02-22
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Granted: 1985-04-09
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Expires: 2004-02-22
Abstract
Abstract The instant invention is directed to a method for reducing the formation of silica deposits in an aqueous system comprising adding an effective amount, preferably at least 0.1 ppm, of a carboxylic functional polyampholyte or the salt thereof to said aqueous system.
Inventors
- 👤 Zahid Amjad
- 👤 Monica A. Yorke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:22
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/14; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/52; C08F220/54; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A method for reducing the formation of silica deposits in an aqueous system comprising adding to said aqueous system an effective amount of a carboxylic functional polyampholyte or the salt thereof, having an intrinsic viscosity of at least 1.0 dl/g. in 1.0M sodium chloride, prepared from 30 to 32.5 percent, by weight, of acrylic acid; 17.5 to 30 percent, by weight, of a cationic-containing monomer selected from the group consisting of dimethyldiallyl ammonium chloride, diethyldiallyl ammonium chloride and mixtures thereof; and 40 to 50 percent, by weight, acrylamide to retard polymerization of silica and reduce the formation of silica deposits in said aqueous system.
Claim 2
Independent Claim
104 words
A method for reducing the formation of silica deposits in an aqueous system comprising adding to said aqueous system an effective amount of a carboxylic functional polyampholyte or the salt thereof, having an intrinsic viscosity of at least 1.0 dl/g. in 1.0M sodium chloride, prepared from 30 to 32.5 percent, by weight, of acrylic acid; 17.5 to 30 percent, by weight, of a cationic-containing monomer selected from the group consisting of dimethyldiallyl ammonium chloride, diethyldiallyl ammonium chloride and mixtures thereof; and 40 to 50 percent, by weight, acrylamide to retard polymerization of silica and reduce the formation of silica deposits in said aqueous system.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein at least 0.1 ppm of carboxylic functional polyampholyte or the salt thereof is used.
References Cited (Backward Citations)
US3085916A
Cited
US3752761A
Cited
US3752760A
Cited
US3900338A
Cited
US4029577A
Cited
US4209398A
Cited
US4164521A
Cited
GB2026517A
Cited
US4328106A
Cited
US4357207A
Cited
US4460477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |