US4241015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxybenzoic acid as pH buffer and corrosion inhibitor for antifreeze containing organosilicone-silicate polymers
Assignee: Ashland LLC
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Filing: 1979-10-09
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Granted: 1980-12-23
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Expires: 1999-10-09
Abstract
Abstract A single-phase antifreeze or coolant concentrate is disclosed comprising an alcohol, a silicone-silicate copolymer and an organic basic pH buffer and corrosion inhibitor comprising a hydroxybenzoic acid or mixtures thereof. The concentrates are preferably used as coolants either undiluted or upon dilution with about 30 to about 90 percent by weight of water based upon the total weight of the coolant. The alcohol is preferably ethylene glycol. The coolant compositions are especially effective in inhibiting the corrosion of aluminum internal combustion engine and radiator components.
Inventors
- 👤 Stanley T. Hirozawa
- 👤 Edward F. O'Brien
- 👤 Joe C. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:01
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
In a process for inhibiting the corrosion of metals that come in contact with an aqueous antifreeze or coolant composition, the improvement wherein said antifreeze or coolant composition consists essentially of a mixture of water and an antifreeze or coolant concentrate consisting essentially of an alcohol selected from the group consisting of methanol, ethanol, propanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol; an organosilicone-silicate polymer corrosion inhibitor; and a hydroxybenzoic acid pH buffer and corrosion inhibitor composition capable of buffering the pH in the range of above about 9 to about 11, wherein said pH buffer is selected from the group consisting of ortho hydroxybenzoic acid, para hydroxybenzoic acid, and mixtures thereof and is present in the amount of about 0.1 to about 1.5 percent by weight based upon the weight of said antifreeze; wherein said organo-silicone-silicate polymer corrosion inhibitor is present in an amount of 0.01 percent to 10 percent by weight of said concentrate; and wherein said polymer consists essentially of:
Claim 2
Dependent Claim
166 words
In a process for inhibiting the corrosion of metals that come in contact with an aqueous antifreeze or coolant composition, the improvement wherein said antifreeze or coolant composition consists essentially of a mixture of water and an antifreeze or coolant concentrate consisting essentially of an alcohol selected from the group consisting of methanol, ethanol, propanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol; an organosilicone-silicate polymer corrosion inhibitor; and a hydroxybenzoic acid pH buffer and corrosion inhibitor composition capable of buffering the pH in the range of above about 9 to about 11, wherein said pH buffer is selected from the group consisting of ortho hydroxybenzoic acid, para hydroxybenzoic acid, and mixtures thereof and is present in the amount of about 0.1 to about 1.5 percent by weight based upon the weight of said antifreeze; wherein said organo-silicone-silicate polymer corrosion inhibitor is present in an amount of 0.01 percent to 10 percent by weight of said concentrate; and wherein said polymer consists essentially of:
Claim 3
Dependent Claim
142 words
(A) 10 to 90 parts by weight of siloxane groups represented by the formula: ##STR2## wherein M is a cation that forms a water-soluble silicate selected from the group consisting of the sodium, potassium, lithium, rubidium and tetra(alkyl)ammonium cations, a is the valence of the cation represented by M and is an integer having a value of at least one, R is a member selected from the group consisting of the unsubstituted divalent hydrocarbon groups, ##EQU5## substituted divalent hydrocarbon groups, each ##STR3## is connected to the silicon atom through at least 2 carbon atoms of the group represented by R, R 1 is a monovalent hydrocarbon group, b is an integer having a value from 1 to 3 inclusive, c is an integer having a value from 0 to 2 inclusive and (b+c) have a value from 1 to 3 inclusive and
Claim 4
Dependent Claim
142 words
(A) 10 to 90 parts by weight of siloxane groups represented by the formula: ##STR2## wherein M is a cation that forms a water-soluble silicate selected from the group consisting of the sodium, potassium, lithium, rubidium and tetra(alkyl)ammonium cations, a is the valence of the cation represented by M and is an integer having a value of at least one, R is a member selected from the group consisting of the unsubstituted divalent hydrocarbon groups, ##EQU5## substituted divalent hydrocarbon groups, each ##STR3## is connected to the silicon atom through at least 2 carbon atoms of the group represented by R, R 1 is a monovalent hydrocarbon group, b is an integer having a value from 1 to 3 inclusive, c is an integer having a value from 0 to 2 inclusive and (b+c) have a value from 1 to 3 inclusive and
Claim 5
Dependent Claim
53 words
(B) 10 to 90 parts by weight of groups represented by the formula: ##STR4## wherein M and a have the above-defined meanings and d is an integer having a value from 1 to 3 inclusive, said parts by weight of said groups being based on 100 parts by weight of the organosilicone-silicate polymer.
Claim 6
Dependent Claim
53 words
(B) 10 to 90 parts by weight of groups represented by the formula: ##STR4## wherein M and a have the above-defined meanings and d is an integer having a value from 1 to 3 inclusive, said parts by weight of said groups being based on 100 parts by weight of the organosilicone-silicate polymer.
Claim 7
Dependent Claim
42 words
The process of claim 1 wherein said alcohol is ethylene glycol and said pH buffer is para hydroxybenzoic acid and said concentrate contains about 0.1 percent to about 10 percent by weight of water all based upon the weight of said concentrate.
Claim 8
Dependent Claim
52 words
The process of claims 1 or 2 wherein said organosilicone-silicate polymer additionally contains siloxane groups represented by the formula: ##EQU6## wherein R" is an unsubstituted monovalent hydrocarbon group or an amino-substituted monovalent hydrocarbon group containing one amino group and e is an integer having a value of from 0 to 3 inclusive.
Claim 9
Dependent Claim
40 words
The process of claim 4 wherein said organo-silicone-silicate polymer has from 10 to 80 parts by weight each of groups represented by formulas I, II, and III, said parts being based upon 100 parts by weight of the organo-silicone-silicate polymer.
Claim 10
Dependent Claim
28 words
The process of claim 3 wherein said coolant composition contains about 30 percent to about 90 percent by weight of water based upon the weight of said alcohol.
Claim 11
Dependent Claim
28 words
The process of claim 4 wherein said coolant composition contains about 30 percent to about 90 percent by weight of water based upon the weight of said alcohol.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |