US4402847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High lead solder corrosion inhibitors
Assignee: Ineos Composites IP LLC
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Filing: 1982-05-19
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Granted: 1983-09-06
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Expires: 2002-05-19
Abstract
Abstract Compositions and method of using said compositions for inhibiting mineral scale and the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum in aqueous systems are disclosed. Unexpectedly, a mixture of a siloxane-silicate copolymer with an azole is effective in reducing the corrosion of high lead solder and aluminum, particularly the cavitation-erosion corrosion of aluminum in contact with aqueous liquids, such as aqueous alcohol solutions used as heat transfer media. Antifreeze concentrates and a process for inhibiting corrosion are also disclosed.
Inventors
- 👤 Joe C. Wilson
- 👤 Stanley T. Hirozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:03
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C09; C09K; C09K5/00; C09K5/20; Y; Y10; Y10S; Y10S62/00; Y10S62/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
175 words
A composition for inhibiting mineral scale and the corrosion of metals in the presence of an aqueous liquid and particularly the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum, comprising: A. an effective metal corrosion inhibiting amount of a siloxane-silicate copolymer containing about 0.1 to about 99.9 parts by weight, per 100 parts by weight of said copolymer, of (a) at least one siloxane group represented by the formula: RSiO.sub.1.5 wherein R is selected from the group consisting of a monovalent aliphatic hydrocarbon having 1 to about 18 carbon atoms, a phenyl group, and a vinyl group and 0.1 to 99.9 parts by weight, per 100 parts by weight of said copolymer, of (b) at least one silicate group represented by the formula: ##EQU2## wherein M is a cation which forms a water-soluble silicate, d is the valence of the cation represented by M and has a value of at least 1 and e has a value of 1 to 3 and B. an effective metal corrosion inhibiting amount of an azole.
Claim 2
Dependent Claim
175 words
A composition for inhibiting mineral scale and the corrosion of metals in the presence of an aqueous liquid and particularly the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum, comprising: A. an effective metal corrosion inhibiting amount of a siloxane-silicate copolymer containing about 0.1 to about 99.9 parts by weight, per 100 parts by weight of said copolymer, of (a) at least one siloxane group represented by the formula: RSiO.sub.1.5 wherein R is selected from the group consisting of a monovalent aliphatic hydrocarbon having 1 to about 18 carbon atoms, a phenyl group, and a vinyl group and 0.1 to 99.9 parts by weight, per 100 parts by weight of said copolymer, of (b) at least one silicate group represented by the formula: ##EQU2## wherein M is a cation which forms a water-soluble silicate, d is the valence of the cation represented by M and has a value of at least 1 and e has a value of 1 to 3 and B. an effective metal corrosion inhibiting amount of an azole.
Claim 3
Dependent Claim
41 words
The composition of claim 1 additionally comprising an effective corrosion inhibiting amount of a water-soluble metal salt nitrate and a pH buffering compound capable of providing a pH of about 8 to about 11 in the presence of said aqueous liquid.
Claim 4
Dependent Claim
56 words
The composition of claim 2 wherein said siloxane is selected from the group consisting of methyl, ethyl, and phenyl siloxane, said aqueous liquid comprises water, a water-soluble alcohol, or a water-miscible organic liquid; and said azole is selected from the group consisting of at least one of an alkali metal mercaptobenzothiazole and an alkali metal tolyltriazole.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein said copolymer is a copolymer of methyl siloxane and an alkali metal silicate.
Claim 6
Dependent Claim
33 words
The composition of claim 4 wherein said composition additionally comprises a pH buffer compound selected from the group consisting of alkali metal benzoate, alkali metal hydroxybenzoates, alkali metal phosphates, and alkali metal carbonates.
Claim 7
Dependent Claim
49 words
A corrosion inhibiting alcohol-based antifreeze concentrate adapted to inhibit the corrosion of metals in contact with aqueous liquids, includingy cavitation-erosion corrosion of aluminum and the corrosion of high lead solder, comprising a water-soluble alcohol, a metal corrosion inhibiting amount of the siloxane-silicate copolymer of claim 1, and an azole.
Claim 8
Dependent Claim
54 words
The concentrate of claim 6 wherein said concentrate additionally comprises a water-soluble metal salt nitrate, a pH buffering compound capable of maintaining the pH of said alcohol-based antifreeze in the range of about 8 to about 11 and wherein said water-soluble alcohol has 1 to 4 carbon atoms and 1 to 3 hydroxy groups.
Claim 9
Dependent Claim
34 words
The concentrate of claim 7 wherein said azole is selected from at least one of the group consisting of an alkali metal mercaptobenzoate and an alkali metal tolyltriazole and said alcohol is ethylene glycol.
Claim 10
Dependent Claim
51 words
The concentrate of claim 8 wherein said pH buffer is selected from at least one of the group consisting of alkali metal benzoate, alkali metal hydroxybenzoates, alkali metal phosphates, and alkali metal carbonates, and wherein said siloxane silicate copolymer is the reaction product of methyl siloxane and an alkali metal silicate.
Claim 11
Dependent Claim
96 words
A corrosion-resistant aqueous liquid useful for inhibiting the corrosion of high lead solder in contact with aqueous compositions and for inhibiting the cavitation-erosion corrosion of aluminum in contact with aqueous liquids comprising an aqueous liquids and a minor but effective metal corrosion inhibiting amount, sufficient to inhibit the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum in contact with aqueous liquids, comprising a mixture of water, the siloxane-silicate copolymer of claim 1, an azole selected from at least one of the group consisting of an alkali metal mercaptobenzothiazole, and an alkali metal tolyltriazole.
Claim 12
Dependent Claim
38 words
The compositin of claim 10 wherein said alkai metal mercaptobenzothiazole is sodium mercaptobenzothiazole which is present in the proportion of at least about 0.05 percent by weight of said aqueous liquid and said aqueous liquid comprises ethylene glycol.
Claim 13
Dependent Claim
31 words
The composition of claim 11 additionally comprising a water-soluble metal salt nitrate and a buffer compound capable of maintaining the pH of said ethylene glycol at about 8 to about 11.
Claim 14
Dependent Claim
21 words
The composition of claim 12 wherein said siloxane-silicate copolymer is the reaction product of methyl siloxane and an alkali metal silicate.
Claim 15
Dependent Claim
51 words
In a process for inhibiting the corrosion of high lead solder and the cavitation-erosion corrosion of aluminum in contact with an aqueous liquid, the improvement wherein said aqueous liquid comprises a water-miscible glycol, a minor but effective metal corrosion inhibiting amount of the siloxane-silicate copolymer of claim 1, and an azole.
Claim 16
Dependent Claim
39 words
The process of claim 14 wherein said water-miscible glycol has 1 to about 4 carbon atoms and 1 to about 3 hydroxy groups and said siloxane-silicate copolymer is the reaction product of methyl siloxane and an alkali metal silicate.
Claim 17
Dependent Claim
28 words
The process of claim 15 wherein said azole is selected from the group consisting of at least one of an alkali metal mercaptobenzothiazole and an alkali metal tolyltriazole.
Claim 18
Dependent Claim
36 words
The process of claim 16 wherein said aqueous liquid additionally comprises a water-soluble metal salt nitrate and a pH buffer compound capable of maintaining the pH of said aqueous liquid at about 8 to about 11.
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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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |