Claims
- 1. A method of inhibiting the formation and deposition of scale imparting compounds in an aqueous system, comprising adding a sufficient amount for the purpose of a water soluble polymer having repeat units of the structure: ##STR7## wherein E in the above formula is the repeat unit obtained after polymerization of ethylenically unsaturated compounds, R.sub.1 is a hydroxyl substituted lower alkylene group having from about 1-6 carbon atoms or a nonsubstituted lower alkylene group having from about 1-6 carbon atoms; R.sub.2 is hydrogen or a lower alkyl group having from about 1-5 carbon atoms; R.sub.3 is a lower alkylene group having from about 1-6 carbon atoms; M is hydrogen or a water soluble cation; the molar ratio of said repeat units g:h being within the range of 30:1 to 1:20.
- 2. The method as recited in claim 1 wherein said ethylenically unsaturated compounds are preferably carboxylic acids selected from the group consisting of amides of said carboxylic acids, lower alkyl (C1-C6) esters of said carboxylic acids or hydroxylated lower alkyl (C1-C6) esters of said carboxylic acids.
- 3. The method as recited in claim 1 wherein said ethylenically unsaturated compounds are selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, maleic acid or anhydride, styrene sulfonic acid, 2-acrylamido-2-methylpropylsulfonic acid, itaconic acid, 2-hydroxypropyl acrylate and water soluble salt derivatives of said acids.
- 4. The method as recited in claim 1 wherein the molar ratio g:h is from about 10:1 to about 1:5.
- 5. The method as recited in claim 1 wherein E comprises acrylic acid, R.sub.1 comprises 2-hydroxypropylene, R.sub.2 comprises methyl and R.sub.3 comprises methylene.
- 6. The method as recited in claim 1 wherein E comprises acrylamide, R.sub.1 comprises 2-hydroxypropylene, R.sub.2 comprises methyl and R.sub.3 comprises methylene.
- 7. The method as recited in claim 1 wherein E comprises methacrylic acid, R.sub.1 comprises hydroxypropylene, R.sub.2 comprises methyl and R.sub.3 comprises methylene.
- 8. The method as recited in claim 1 wherein said polymer is a terpolymer in which E comprises repeat units of two different ethylenically unsaturated compounds and R.sub.1 comprises hydroxypropylene, R.sub.2 comprises methyl and R.sub.3 comprises methylene.
- 9. The method as recited in claim 1 wherein said water soluble cation M is Na.sup.+, K.sup.+ or NH.sub.4.sup.+.
- 10. The method as recited in claim 1 wherein said aqueous system is a steam generating system.
- 11. The method as recited in claim 1 wherein said aqueous system is a cooling water system.
- 12. The method as recited in claim 1 wherein said aqueous system is a conversion coating system.
- 13. The method as recited in claim 1 wherein the aqueous system is a paper and pulp processing system.
- 14. The method as recited in claim 1 wherein the aqueous system is a gas scrubbing system.
Parent Case Info
This is a continuation of Ser. No. 313,692 filed Feb. 21, 1989, now U.S. Pat. No. 4,851,490, which is a continuation-in-part of Ser. No. 191,309 filed May 6, 1988, now U.S. Pat. No. 4,849,129, which is a continuation-in-part of Ser. No. 037,484, filed Apr. 13, 1987, now U.S. Pat. No. 4,759,851, which is a continuation of Ser. No. 864,049 filed May 16,1986, now U.S. Pat. No. 4,659,481, which is a continuation of Ser. No. 545,563 Oct. 26, 1983, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
56-155692 |
Dec 1981 |
JPX |
59-135202 |
Aug 1984 |
JPX |
Continuations (3)
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Number |
Date |
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Parent |
313692 |
Feb 1989 |
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Parent |
864049 |
May 1986 |
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Parent |
545563 |
Oct 1988 |
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Continuation in Parts (2)
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Parent |
191309 |
May 1988 |
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Parent |
37484 |
Apr 1987 |
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