US4163733A
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Synergistic compositions for corrosion and scale control
Assignee: Buckman Laboratories International Inc
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Filing: 1977-10-25
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Granted: 1979-08-07
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Expires: 1997-10-25
Abstract
Abstract Dimethylaminomethylenebis(phosphonic acid) is prepared by reacting dimethylformamide with phosphorous trichloride and treating the reaction mixture with alcohols or glycols and water. The phosphonic acid is combined with water soluble carboxylic acid polymers for use as a corrosion and scale inhibitor in aqueous systems. These compositions may also be combined with phosphorous acid and water soluble zinc salts.
Inventors
- 👤 John D. Buckman
- 👤 Gerald D. Mercer
- 👤 John D. Pera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:04
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3839; C07F9/3873; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
109 words
A corrosion and scale inhibiting composition consisting essentially of on a weight basis: about 10 to about 90% dimethylaminoethylenebis-(phosphonic acid) or a water-soluble salt thereof, a water-soluble polymer having a linear hydrocarbon structure with side chain carboxylic groups exemplified by the structure: ##STR4## wherein R is hydrogen or --COOH and R' is hydrogen or methyl in an amount varying from about 10 to about 90% and one or more of the following: A. water B. about 0 to 25% of an aqueous solution of phosphorous acid or an alkali metal salt thereof, or C. about 1.5 to about 13.5% of an aqueous solution of a water soluble zinc salt.
Claim 2
Dependent Claim
109 words
A corrosion and scale inhibiting composition consisting essentially of on a weight basis: about 10 to about 90% dimethylaminoethylenebis-(phosphonic acid) or a water-soluble salt thereof, a water-soluble polymer having a linear hydrocarbon structure with side chain carboxylic groups exemplified by the structure: ##STR4## wherein R is hydrogen or --COOH and R' is hydrogen or methyl in an amount varying from about 10 to about 90% and one or more of the following: A. water B. about 0 to 25% of an aqueous solution of phosphorous acid or an alkali metal salt thereof, or C. about 1.5 to about 13.5% of an aqueous solution of a water soluble zinc salt.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the water soluble polymer is poly(acrylic acid).
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the water soluble polymer is poly(methacrylic acid).
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein the water soluble polymer is hydrolyzed poly(maleic anhydride).
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein the water soluble polymer is hydrolyzed polyacrylonitrile.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein the water soluble polymer is hydrolyzed polyacrylamide.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein the dimethylaminomethylenebis (phosphonic acid) and water soluble polymer are dissolved in water.
Claim 9
Dependent Claim
20 words
The composition of claim 1 wherein the dimethylaminomethylenebis (phosphonic acid) and water soluble polymer are combined with aqueous phosphorous acid.
Claim 10
Dependent Claim
23 words
The composition of claim 1 wherein the dimethylaminomethylenebis (phosphonic acid) and water soluble polymer are combined with aqueous zinc chloride and hydrochloric acid.
Claim 11
Dependent Claim
25 words
The composition of claim 1 wherein the dimethylaminomethylenebis (phosphonic acid) and water soluble polymer are combined with phosphorous acid, zinc chloride, hydrochloric acid, and water.
Claim 12
Dependent Claim
132 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems consisting essentially in adding to water in said systems an effective amount of a composition consisting essentially of on a weight basis: about 10 to about 90% dimethylaminomethylenebis (phosphonic acid) or a water-soluble salt thereof, a water-soluble polymer having a linear hydrocarbon structure with side chain carboxylic acid groups exemplified by the structure: ##STR5## wherein R is hydrogen or --COOH and R' is hydrogen or methyl in an amount varying from about 10 to about 90% and one or more of the following: A. water B. about 0 to 25% of an aqueous solution of phosphorous acid or an alkali metal salt thereof, or C. about 1.5 to about 13.5% of an aqueous solution of a water-soluble zinc salt.
Claim 13
Dependent Claim
132 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems consisting essentially in adding to water in said systems an effective amount of a composition consisting essentially of on a weight basis: about 10 to about 90% dimethylaminomethylenebis (phosphonic acid) or a water-soluble salt thereof, a water-soluble polymer having a linear hydrocarbon structure with side chain carboxylic acid groups exemplified by the structure: ##STR5## wherein R is hydrogen or --COOH and R' is hydrogen or methyl in an amount varying from about 10 to about 90% and one or more of the following: A. water B. about 0 to 25% of an aqueous solution of phosphorous acid or an alkali metal salt thereof, or C. about 1.5 to about 13.5% of an aqueous solution of a water-soluble zinc salt.
Claim 14
Dependent Claim
44 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems from 0.5 to 1000 parts per million parts of water of the composition as defined in claim 11.
Claim 15
Dependent Claim
45 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems an effective amount of the composition as defined in claim 11 wherein the water soluble polymer is poly(acrylic acid).
Claim 16
Dependent Claim
50 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems an effective amount of the composition as defined in claim 11 wherein the water soluble polymer is poly(acrylic acid) and the composition phosphorous acid.
Claim 17
Dependent Claim
51 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems an effective amount of the composition as defined in claim 11 wherein the water soluble polymer is poly(acrylic acid) and the composition contains zinc chloride.
Claim 18
Dependent Claim
56 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems an effective amount of the composition as defined in claim 11 wherein the water soluble polymer is poly(acrylic acid) and the composition contains phosphorous acid, zinc chloride, and hydrochloric acid.
Claim 19
Dependent Claim
48 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems from 0.5 to 1000 parts per million of the composition as defined in claim 11 comprising dimethylaminomethylenebis(phosphonic acid), poly(acrylic acid), and water.
Claim 20
Dependent Claim
50 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems from 0.5 to 1000 parts per million of the composition as defined in claim 11 comprising dimethylaminomethylenebis(phosphonic acid), poly(acrylic acid), phosphorous acid, and water.
Claim 21
Dependent Claim
52 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems from 0.5 to 1000 parts per million of the composition as defined in claim 11 comprising dimethylaminomethylenebis(phosphonic acid), poly(acrylic acid), zinc chloride, hydrochloric acid, and water.
Claim 22
Dependent Claim
54 words
A process for inhibiting corrosion and scaling of metal surfaces in water systems according to claim 11 consisting essentially in adding to water in said systems from 0.5 to 1000 parts per million of the composition as defined in claim 11 comprising dimethylaminomethylenebis(phosphonic acid), poly(acrylic acid), phosphorous acid, zinc chloride, hydrochloric acid, and water.
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) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |