US4465516A
Expired / Lapsed
US
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Asymmetrical diesters of ortho-phosphoric acid useful as corrosion inhibitors
Assignee: Sandoz AG
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Filing: 1983-03-10
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Granted: 1984-08-14
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Expires: 2003-03-10
Abstract
Abstract Asymmetrical phosphate esters of formula I <IMAGE> I in which R is C1-20alkyl, R1 is C1-20alkyl, R2 is hydrogen or methyl x is 1-15 and M is hydrogen, an alkali metal ion or an equivalent of an alkali earth metal or zinc ion are effective inhibitors of oxidative corrosion of metals in the presence of electrolytes. They may be used alone or in conjunction with further additives, and are preferably dissolved in the electrolyte with which the metal is to come in contact.
Inventors
- 👤 Bernard Danner
- 👤 Hartmut Mau
- 👤 Hans Stettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:21
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1673; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A composition for inhibiting the corrosion of metals in the presence of weakly acidic to weakly basic electrolytes comprising a compound of formula I: ##STR8## in which R is C 8-18 alkyl, R 1 is C 2-4 alkyl, R 2 is hydrogen or methyl, x is 1-15, and M is hydrogen, an alkali metal ion or an equivalent of an alkaline earth metal or zinc ion, in association with a carrier.
Claim 2
Dependent Claim
71 words
A composition for inhibiting the corrosion of metals in the presence of weakly acidic to weakly basic electrolytes comprising a compound of formula I: ##STR8## in which R is C 8-18 alkyl, R 1 is C 2-4 alkyl, R 2 is hydrogen or methyl, x is 1-15, and M is hydrogen, an alkali metal ion or an equivalent of an alkaline earth metal or zinc ion, in association with a carrier.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 in which the carrier is an aqueous carrier.
Claim 4
Dependent Claim
12 words
A composition according to claim 1 in which zinc ions are present.
Claim 5
Dependent Claim
39 words
A composition according to claim 1 in which components (a) and (b) are present, of which (a) is one or more compounds of formula I, and (b) is one or more compounds selected from mercaptobenzothiazoles, benzotriazoles and sodium boroheptonate.
Claim 6
Dependent Claim
44 words
A composition according to claim 4 in which are present components (a),(b) and (c), of which (a) and (b) are as defined in claim 4 and (c) is one or more compounds selected from pH-adjusting agents, biocides, anti-scaling agents, mild oxidizing agents and surfactants.
Claim 7
Dependent Claim
54 words
A corrosion-inhibiting composition according to claim 1 comprising 1-60% by weight of compound of formula I, together with a zinc salt; one or more compounds selected from mercaptobenzothiazoles, benzotriazoles, and sodium boroheptonate; and one or more compounds selected from pH-adjusting agents, biocides, anti-scaling agents, mild oxidizing agents and surfactants, all dissolved in a solvent.
Claim 8
Dependent Claim
43 words
A composition according to claim 1 in which the compound of formula I has the structure I': ##STR9## in which R' is C 8-18 alkyl R 1 ' is C 2-4 alkyl x' is 3-12 and M' is Na, K, 1/2Ca or 1/2Zn.
Claim 9
Dependent Claim
42 words
A composition according to claim 1 in which the compound of formula I has the structure I": ##STR10## in which R" is C 12-16 alkyl R 1 " is C 2-4 alkyl x" is 6-9 and M" is Na, K or 1/2Zn.
Claim 10
Dependent Claim
13 words
A composition according to claim 5 in which the biocide is 5,5' dichloro-2,2'-dihydroxydiphenylmethane.
Claim 11
Dependent Claim
19 words
A composition according to claim 5 in which the antiscaling agent is gluconic acid, mannonic acid or sodium heptonate.
Claim 12
Dependent Claim
15 words
A composition according to claim 5 in which the mild oxidizing agent is nitrate ion.
Claim 13
Dependent Claim
10 words
A composition according to claim 1 which is a suspension.
Claim 14
Dependent Claim
14 words
A composition according to claim 1 in which M of the compound is sodium.
Claim 15
Dependent Claim
19 words
A composition according to claim 13 in which R is tridecyl, R 1 is n-butyl and x is 7.
References Cited (Backward Citations)
GB1012418A
Cited
US3510436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |