US5076951A
Expired / Lapsed
US
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Antifreeze compositions
Assignee: BASF Corp
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Filing: 1990-05-14
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Granted: 1991-12-31
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Expires: 2010-05-14
Abstract
Abstract The present invention provides a polyhydric alcohol antifreeze composition comprising A) as hard water deposition inhibitor, a hydrolyzed copolymer of maleic anhydride with a mono-ethylenically unsaturated monomer, or mixture of monomers, the molar ratio of maleic anhydride to other monomers being from 2.5:1 to 100:1, and the molecular weight of the copolymer being below 1000; and optionally B) as corrosion inhibitor, at least one of B-1) a triazine compound having the formula (I): ##STR1## wherein Z is a C 1 -C 11 alkylene group, X is hydrogen, an alkali metal or mono-, di- or tri-ethanolamine, R 1 and R 2 , independently, are hydrogen or methyl and R 3 is a group --NR 4 R 5 in which R 4 is C 1 -C 12 alkyl or --Z--COOX in which Z and X have their previous significance, and R 5 is hydrogen or C 1 -C 12 alkyl; B-2) 2-hydroxyphosphonoacetic acid; B-3) (2-Benzo-thiazolylthio)succinic acid and B-4) (2-benzothiazolylthio)-acetic acid.
Inventors
- 👤 Peter Miles
- 👤 Upendra P. Gandhi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
177 words
A polyhydric alcohol antifreeze composition comprising A) as hard water deposition inhibitor, 0.001 to 1% by weight, based on the total weight of the antifreeze composition, of a hydrolyzed copolymer of maleic anhydride with a mono-ethylenically unsaturated monomer, or mixture of monomers, the molar ratio of maleic anhydride to other monomers being from 2.5:1 to 100:1, and the molecular weight of the copolymer being below 1000, and B) as corrosion inhibitor, 0.001 to 5% by weight, based on the total weight of the antifreeze composition, of at least one compound selected from the group consisting of B-1) a triazine compound having the formula I ##STR3## wherein Z is C 1 -C 11 -alkylene, X is hydrogen, an alkali metal or a mono-, di- or tri-ethanolamine group, R 1 and R 2 are independently hydrogen or methyl, and R 3 is --NR 4 R 5 in which R 4 is C 1 -C 12 -alkyl or --Z--COOX, and R 5 is hydrogen or C 1 -C 12 -alkyl; B-2) 2-hydroxyphosphonoacetic acid; B-3) 2-benzothiazolylthiosuccinic acid; and B-4) 2-benzothiazolylthioacetic acid.
Claim 2
Dependent Claim
177 words
A polyhydric alcohol antifreeze composition comprising A) as hard water deposition inhibitor, 0.001 to 1% by weight, based on the total weight of the antifreeze composition, of a hydrolyzed copolymer of maleic anhydride with a mono-ethylenically unsaturated monomer, or mixture of monomers, the molar ratio of maleic anhydride to other monomers being from 2.5:1 to 100:1, and the molecular weight of the copolymer being below 1000, and B) as corrosion inhibitor, 0.001 to 5% by weight, based on the total weight of the antifreeze composition, of at least one compound selected from the group consisting of B-1) a triazine compound having the formula I ##STR3## wherein Z is C 1 -C 11 -alkylene, X is hydrogen, an alkali metal or a mono-, di- or tri-ethanolamine group, R 1 and R 2 are independently hydrogen or methyl, and R 3 is --NR 4 R 5 in which R 4 is C 1 -C 12 -alkyl or --Z--COOX, and R 5 is hydrogen or C 1 -C 12 -alkyl; B-2) 2-hydroxyphosphonoacetic acid; B-3) 2-benzothiazolylthiosuccinic acid; and B-4) 2-benzothiazolylthioacetic acid.
Claim 3
Dependent Claim
15 words
An antifreeze composition according to claim 1 wherein the compound of formula I is 2,4,6-tris-(5'-carboxypentyl-amino)-1,3,5-triazine.
Claim 4
Dependent Claim
23 words
An antifreeze composition according to claim 1, wherein the polyhydric alcohol is ethylene glycol or a mixture of ethylene glycol and diethylene glycol.
Claim 5
Dependent Claim
28 words
An antifreeze composition according to claim 1 wherein the proportion of component A) ranges from 0.005 to 0.5% by weight, based on the weight of the antifreeze composition.
Claim 6
Dependent Claim
29 words
An antifreeze composition according to claim 4 wherein the proportion of component A) ranges from 0.01 to 0.05% by weight, based on the total weight of the antifreeze composition.
Claim 7
Dependent Claim
29 words
An antifreeze composition according to claim 1 wherein the proportion of component B) ranges from 0.002 to 0.5% by weight, based on the total weight of the antifreeze compositions.
Claim 8
Dependent Claim
29 words
An antifreeze composition according to claim 6 wherein the proportion of component B) ranges from 0.01 to 0.3% by weight, based on the total weight of the antifreeze composition.
Claim 9
Dependent Claim
23 words
An antifreeze composition according to claim 1 wherein one or more further additives, known to be useful in antifreeze compositions, are also present.
Claim 10
Dependent Claim
38 words
An antifreeze composition according to claim 8 wherein the further additive is one or more of a further corrosion inhibitor, a further hard water deposit inhibitor, a metal deactivator, a biocide, a buffer, a colourant and an antifoamant.
Claim 11
Dependent Claim
31 words
An antifreeze composition according to claim 9 wherein the further corrosion inhibitor is one or more of an alkali metal nitrate, an alkali metal nitrite and a water-soluble alkali metal silicate.
Claim 12
Dependent Claim
22 words
An antifreeze composition according to claim 9 wherein the metal deactivator is benzotriazole, tolutriazole or mercaptobenzthiazole, or an alkali metal salt thereof.
Claim 13
Dependent Claim
18 words
An antifreeze composition according to claim 9 wherein the buffer is an alkali metal carbonate, borate or phosphate.
Claim 14
Dependent Claim
16 words
A coolant for an internal combustion engine comprising an antifreeze composition as claimed in claim 1.
Claim 15
Dependent Claim
43 words
A method of applying hard water deposition inhibition properties to an antifreeze composition according to claim 1 in a cooling system of an internal combustion engine by adding an effective amount of a compound A) according to claim 1 to said antifreeze composition.
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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) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |