US4717499A
Expired / Lapsed
US
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Water treatment polymers and methods of use thereof
Assignee: Veolia WTS USA Inc
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Filing: 1987-03-26
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Granted: 1988-01-05
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Expires: 2007-03-26
Abstract
Abstract A water soluble polymer composition is disclosed. The polymer has repeat units characterized by the structural formulae: ##STR1## wherein R 1 is H or lower alkyl (C 1 -C 3 ); R 2 is OH, OM, or NH 2 ; M is a water soluble cation; R 3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1. The copolymer is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion of metal parts in contact with water systems.
Inventors
- 👤 Fu Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:28
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/125; C02F5/105; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
Composition for simultaneously inhibiting corrosion and deposit formation comprising: (a) from about 3-10 wt% of a water soluble acrylic acid/allylhydroxypropylsulfonate ether copolymer or water soluble salt form thereof, said copolymer having the formula ##STR12## wherein M is a water soluble cation, the molar ratio x:y being from about 3:1-6:1 and wherein the number average molecular weight of said copolymer is from about 5,000 to 10,000; (b) from about 0.3-2 wt.% of a water-soluble divalent zinc compound; (c) from about 0.5-4 wt% of a water soluble phosphonate compound; (d) remainder water.
Claim 2
Dependent Claim
90 words
Composition for simultaneously inhibiting corrosion and deposit formation comprising: (a) from about 3-10 wt% of a water soluble acrylic acid/allylhydroxypropylsulfonate ether copolymer or water soluble salt form thereof, said copolymer having the formula ##STR12## wherein M is a water soluble cation, the molar ratio x:y being from about 3:1-6:1 and wherein the number average molecular weight of said copolymer is from about 5,000 to 10,000; (b) from about 0.3-2 wt.% of a water-soluble divalent zinc compound; (c) from about 0.5-4 wt% of a water soluble phosphonate compound; (d) remainder water.
Claim 3
Dependent Claim
18 words
Composition as recited in claim 1 wherein said phosphonate (c) comprises hydroxyethylidine diphosphonic acid or water soluble salt.
Claim 4
Dependent Claim
16 words
Composition as recited in claim 1 further comprising from about 0.75-2 wt% of an azole compound.
Claim 5
Dependent Claim
21 words
Composition as recited in claim 1 further comprising about 5-10 wt% of a water soluble chromate compound containing hexavalent chromium ions.
Claim 6
Dependent Claim
71 words
Composition comprising: a. from about 3-10 wt % of a water soluble acrylic acid/allylhydroxypropylsulfonate ether copolymer or water soluble salt form thereof, said copolymer having the formula ##STR13## wherein M is a water soluble cation and the molar ratio x:y is from about 30:1-1:20; (b) from about 0.3-2 wt % of a water-soluble divalent zinc compound; (c) from about 0.5-4 wt % of a water soluble phosphonate compound; (d) remainder water.
Claim 7
Dependent Claim
71 words
Composition comprising: a. from about 3-10 wt % of a water soluble acrylic acid/allylhydroxypropylsulfonate ether copolymer or water soluble salt form thereof, said copolymer having the formula ##STR13## wherein M is a water soluble cation and the molar ratio x:y is from about 30:1-1:20; (b) from about 0.3-2 wt % of a water-soluble divalent zinc compound; (c) from about 0.5-4 wt % of a water soluble phosphonate compound; (d) remainder water.
Claim 8
Dependent Claim
17 words
Composition as recited in claim 5 wherein the molar ratio x:y is about 10:1 to about 1.5.
Claim 9
Dependent Claim
18 words
Composition as recited in claim 5 wherein said phosphonate (c) comprises hydroxyethylidene diphosphonic acid or water soluble salt.
Claim 10
Dependent Claim
17 words
Composition as recited in claim 5 further comprising from about 0.75-2 wt % of an azole compound.
Claim 11
Dependent Claim
22 words
Composition as recited in claim 5 further comprising about 5-10 wt % of a water soluble chromate compound containing hexavalent chromium ions.
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |