US4836933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment polymer
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1987-01-16
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Granted: 1989-06-06
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Expires: 2007-01-16
Abstract
Abstract Aqueous media are treated to reduce or prevent the deposition of solid material therein comprising the addition to the water of an effective amount of at least one polymer or copolymer formed from a monomer of the following general structure: ##STR1## wherein R 1 is independently H or CH 3 ; X is (CH 2 )n with n an integer of 0 or 1 or ##STR2## n 1 is an integer of 1 to 10; and M is a metal cation, ammonium or hydrogen.
Inventors
- 👤 Peter G. Montague
- 👤 Peter Bainbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:14
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
A method for treating aqueous systems to reduce or prevent the deposition of solid material therein comprising the addition thereto of an effective amount of a polymer or copolymer consisting essentially of 2 to 100 mole percent of a monomer of the following general structure: ##STR8## where R 1 is independently H or CH 3 ; X is (CH 2 )n with n an integer of 0 to 1 or ##STR9## n 1 is an integer of 1 to 10; and M is a metal cation, ammonium or hydrogen; 0 to 98% of a comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid and water soluble salt, thereof, acrylamide and its derivatives thereof; and 0 to 50% of a third copolymerizable comonomer.
Claim 2
Independent Claim
126 words
A method for treating aqueous systems to reduce or prevent the deposition of solid material therein comprising the addition thereto of an effective amount of a polymer or copolymer consisting essentially of 2 to 100 mole percent of a monomer of the following general structure: ##STR8## where R 1 is independently H or CH 3 ; X is (CH 2 )n with n an integer of 0 to 1 or ##STR9## n 1 is an integer of 1 to 10; and M is a metal cation, ammonium or hydrogen; 0 to 98% of a comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid and water soluble salt, thereof, acrylamide and its derivatives thereof; and 0 to 50% of a third copolymerizable comonomer.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the polymer or copolymer has a molecular weight of 1000 to 100,000.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the polymer or copolymer has a molecular weight of 1000 to 20,000.
Claim 5
Dependent Claim
18 words
The method of claim 2 wherein the polymer or copolymer has a molecular weight of 1000 to 7500.
Claim 6
Dependent Claim
48 words
The method of claim 1 wherein the third comonomer is selected from the group consisting of esters of ethylenically polymerizable carboxylic acids, maleate and fumarate esters and diesters, hydroxyalkyl acrylates, allyl alcohol, vinyl esters, vinyl alcohol obtained by hydrolyzing a vinyl ester based polymer, vinyl ethers and styrene.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the aqueous system is a steam generating system.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein the aqueous system is a cooling water system.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the aqueous system is a gas scrubbing system.
Claim 10
Independent Claim
87 words
A method for treating aqueous systems to reduce or prevent the deposition of solid material therein comprising the addition thereto of an effective amount of a polymer or copolymer consisting essentially of 2 to 100 mole percent of a 2-sulfato alkyl acrylate acrylate or methacrylate or water soluble salt therof; 0 to 98% of a comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid and water soluble salt, thereof, acrylamide and its derivatives thereof; and 0 to 50% of a third copolymerizable comonomer.
Claim 11
Independent Claim
87 words
A method for treating aqueous systems to reduce or prevent the deposition of solid material therein comprising the addition thereto of an effective amount of a polymer or copolymer consisting essentially of 2 to 100 mole percent of a 2-sulfato alkyl acrylate acrylate or methacrylate or water soluble salt therof; 0 to 98% of a comonomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid and water soluble salt, thereof, acrylamide and its derivatives thereof; and 0 to 50% of a third copolymerizable comonomer.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein the polymer or copolymer has a molecular weight of 1000 to 100,000.
Claim 13
Dependent Claim
48 words
The method of claim 9 wherein the third monomer is selected from the group consisting of esters of ethylenically polymerizable carboxylic acids, maleate and fumarate esters and diesters, hydroxyalkyl acrylates, allyl alcohol, vinyl esters, vinyl alcohol obtained by hydrolyzing a vinyl ester based polymer, vinyl ethers and styrene.
Claim 14
Dependent Claim
20 words
The method of claim 9 wherein the 2-sulfato alkyl methacrylate is 2-sulfato ethyl methacrylate or a water soluble salt thereof.
Claim 15
Dependent Claim
18 words
The method of claim 9 wherein the polymer contains at least 5 molar percent of the 2-sulfato(meth)acrylate comonomer.
Claim 16
Dependent Claim
18 words
The method of claim 9 wherein the copolymer contains at least 40 molar percent of the 2-sulfato(meth)acrylate comonomer.
Claim 17
Dependent Claim
21 words
The method of claim 9 wherein the copolymer consists essentially of acrylic acid, allyl alcohol and 2-sulfato ethyl methacrylate ammonium salt.
Claim 18
Dependent Claim
18 words
The method of claim 9 wherein the copolymer consists essentially ofacrylic acid, hydroxypropyl acrylate and 2-sulfato ethyl methacrylate.
Claim 19
Dependent Claim
18 words
The methodof claim 9 wherein the copolymer consists essentially of acrylic acid and 2-sulfato ethyl methacrylate ammonium salt.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |