US4533481A
Expired / Lapsed
US
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Polycarboxylic acid/boric acid/amine salts and aqueous systems containing same
Assignee: Lubrizol Corp
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Filing: 1983-04-20
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Granted: 1985-08-06
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Expires: 2003-04-20
Abstract
Abstract Inhibitors useful in preventing the corrosion of metal surfaces that contact aqueous systems containing them are disclosed. The inhibitors comprise mixtures of monoamine salts of polycarboxylic acids and boric acid. Typical corrosion inhibitors are made from acids such as dodecanedioic, sebacic and azelaic acid, monoamines such as mono-, di- and triethanol amines and boric acid.
Inventors
- 👤 Richard W. Jahnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:12
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M159/00; C10M159/12; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/143; C10M2201/00; C10M2201/02; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/127; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/24; C10M2215/26; C10M2227/00; C10M2227/06; C10M2227/061; C10M2227/062; C10M2227/063; C10M2227/065; C10M2227/066; C10N; C10N2040/00; C10N2040/20; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
131 words
Amine boron carboxylic salts useful as metal corrosion inhibitors for use in aqueous systems derived from (A) at least one polycarboxylic acid (I) corresponding to the formula R(COOH).sub.2-3 (I) wherein R is an alkylene, alkenylene, alkynylene or hydroxyl alkylene group of about 4 to about 25 carbon atoms, (B) at least one monoamine (II) corresponding to the formula (R').sub.3 N (II) wherein each R' is independently hydrogen, a C 1-20 hydrocarbyl or a C 2-20 hydroxyl hydrocarbyl group, and (C) a boron compound comprising at least one of boric acid, boron trioxide, boron halides and esters of boric acid; wherein said amine boron carboxylic salts are formed by neutralizing said carboxylic acid (I) and said boron acid with said amine (II) at an elevated temperature which does not exceed 100° C.
Claim 2
Dependent Claim
131 words
Amine boron carboxylic salts useful as metal corrosion inhibitors for use in aqueous systems derived from (A) at least one polycarboxylic acid (I) corresponding to the formula R(COOH).sub.2-3 (I) wherein R is an alkylene, alkenylene, alkynylene or hydroxyl alkylene group of about 4 to about 25 carbon atoms, (B) at least one monoamine (II) corresponding to the formula (R').sub.3 N (II) wherein each R' is independently hydrogen, a C 1-20 hydrocarbyl or a C 2-20 hydroxyl hydrocarbyl group, and (C) a boron compound comprising at least one of boric acid, boron trioxide, boron halides and esters of boric acid; wherein said amine boron carboxylic salts are formed by neutralizing said carboxylic acid (I) and said boron acid with said amine (II) at an elevated temperature which does not exceed 100° C.
Claim 3
Dependent Claim
28 words
The inhibitor of claim 1 wherein the polycarboxylic acid (I) is a dicarboxylic acid and R is an alkylene group containing from about 4 to 15 carbon atoms.
Claim 4
Dependent Claim
16 words
The inhibitor of claim 1 wherein at least one of R' is a hydroxyl alkyl group.
Claim 5
Dependent Claim
19 words
The inhibitor of claim 3 wherein R is an alkylene group of about 4 to about 10 carbon atoms.
Claim 6
Dependent Claim
23 words
The inhibitor of claim 4 wherein the acid (I) is sebacic, azelaic, dodecanedioic acid or mixtures of two or more of said acids.
Claim 7
Dependent Claim
34 words
The inhibitor of claim 5 wherein the amine (II) is ethanol amine, diethanol amine, triethanol amine, propanol amine, di(propanol)amine, tri(propanol)amine, N,N-di(lower alkyl)ethanol or propanol amine or mixtures of two or more of said amines.
Claim 8
Dependent Claim
19 words
The inhibitor of claim 6 wherein the acid (I) is dodecanedioic acid and the amine (II) is ethanol amine.
Claim 9
Dependent Claim
23 words
The inhibitor of claim 1 wherein the acid (I) is a mixture of dodecanedioic, sebacic and azelaic acids and the amine is ethanolamine.
Claim 10
Dependent Claim
10 words
The inhibitor of claim 8 wherein (C) is boric acid.
Claim 11
Dependent Claim
38 words
The inhibitor of claim 1 wherein the salts are made from a mixture comprising, on a weight basis, about 15-30% of the polycarboxylic acid (I), about 40-55% of the monoamine (II) and about 5-20% of the boron compound.
Claim 12
Dependent Claim
23 words
The inhibitor of claim 1 comprising a mixture of an amine salt of the polycarboxylic acid and an amine salt of boric acid.
Claim 13
Dependent Claim
20 words
An aqueous system containing a corrosion inhibiting amount of at least one metal corrosion inhibitor as described in claim 1.
Claim 14
Dependent Claim
20 words
An aqueous system containing a corrosion inhibiting amount of at least one metal corrosion inhibitor as described in claim 2.
Claim 15
Dependent Claim
20 words
An aqueous system containing a corrosion inhibiting amount of at least one metal corrosion inhibitor as described in claim 4.
Claim 16
Dependent Claim
20 words
An aqueous system containing a corrosion inhibiting amount of at least one metal corrosion inhibitor as described in claim 7.
Claim 17
Dependent Claim
20 words
An aqueous system containing a corrosion inhibiting amount of at least one metal corrosion inhibitor as described in claim 9.
Claim 18
Dependent Claim
19 words
A method of inhibiting metal corrosion which comprises contacting the metal with the aqueous system described in claim 12.
Claim 19
Dependent Claim
19 words
A method of inhibiting metal corrosion which comprises contacting the metal with the aqueous system described in claim 15.
Claim 20
Dependent Claim
19 words
A method of inhibiting metal corrosion which comprises contacting the metal with the aqueous system described in claim 16.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |