US4604212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of copolymers of carboxylic monomer and betaine-containing monomer as corrosion and scale inhibitors
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1985-05-16
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Granted: 1986-08-05
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Expires: 2005-05-16
Abstract
Abstract The instant invention is directed to a process for inhibiting corrosion and the formation and deposition of scale in aqueous systems comprising adding to the system at least 0.1 ppm. of a water soluble polymer, having an intrinsic viscosity of 0.05 to 2.5 dl/g, prepared from: (A) 50 to 95%, by weight, of an unsaturated carboxylic acid, or its salt, and (B) 5 to 50%, by weight, of a betaine-containing monomer selected from the group consisting of: <IMAGE> (i) <IMAGE> (ii) <IMAGE> (iii) wherein R, which may be the same or different, is hydrogen, a straight or branched, alkyl or an aryl or alkylaryl group of from 1 to 20 carbon atoms; R1, which may be the same or different, is a saturated, straight or branched alkyl group of from 1 to 10 carbon atoms; A is NH or O; and Z is <IMAGE>
Inventors
- 👤 Gary F. Matz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:57
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
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A process for inhibiting corrosion and the formation and deposition of scale in aqueous systems, comprising adding to the system at least 0.1 ppm of a water-soluble polymer having an intrinsic viscosity of 0.05 to 2.5 dl/g prepared from: (A) 50 to 95%, by weight, of an unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid, or its salt, and (B) 5 to 50% by weight, of a betaine-containing monomer selected from the group consisting of: ##STR7## wherein R, which may be the same or different, is hydrogen, a straight or branched, alkyl or an aryl or alkylaryl group of from 1 to 20 carbon atoms; R 1 , which may be the same or different, is a saturated, straight or branched alkyl group of from 1 to 5 carbon atoms; A is NH or O; and Z is ##STR8##
Claim 2
Dependent Claim
145 words
A process for inhibiting corrosion and the formation and deposition of scale in aqueous systems, comprising adding to the system at least 0.1 ppm of a water-soluble polymer having an intrinsic viscosity of 0.05 to 2.5 dl/g prepared from: (A) 50 to 95%, by weight, of an unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid, or its salt, and (B) 5 to 50% by weight, of a betaine-containing monomer selected from the group consisting of: ##STR7## wherein R, which may be the same or different, is hydrogen, a straight or branched, alkyl or an aryl or alkylaryl group of from 1 to 20 carbon atoms; R 1 , which may be the same or different, is a saturated, straight or branched alkyl group of from 1 to 5 carbon atoms; A is NH or O; and Z is ##STR8##
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein 0.1 to 25 ppm of said polymer is added to the system.
Claim 4
Dependent Claim
17 words
The process of claim 1, wherein said polymer has an intrinsic viscosity of 0.05 to 0.5 dl/g.
Claim 5
Dependent Claim
26 words
The process of claim 1, wherein said polymer is prepared from 60 to 95%, by weight, of (A) and 5 to 40%, by weight, of (B).
Claim 6
Dependent Claim
26 words
The process of claim 4, wherein said polymer is prepared from 70 to 90%, by weight, of (A) and 10 to 30%, by weight, of (B).
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein said polymer is prepared from acrylic acid and N-methacroyloxyethyl-N-(3-sulfopropyl)-N,N-dimethyl ammonium betaine.
References Cited (Backward Citations)
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US3689470A
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US3929635A
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US4140664A
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US4460477A
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US4536292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |