US3982894A
Expired / Lapsed
US
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Method of inhibiting acidic corrosion of ferrous metals with polyquaternary amino polymers
Assignee: Baker Petrolite LLC
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Filing: 1971-12-22
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Granted: 1976-09-28
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Expires: 1991-12-22
Abstract
Abstract Polyquaternary amines, for example those formed by reacting mono- or polyamines with a polyfunctional compound, for example difunctional compounds such as organohalides, epihalohydrins, etc., which are capable of both quaternizing and extending the molecular weight of the amine; and to uses for these polyquaternaries, particularly as corrosion inhibitors for highly acid systems.
Inventors
- 👤 Robert R. Annand
- 👤 Aldred E. Woodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:11
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23F; C23F11/00; C23F11/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting a monoamine with an organic dichloride, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10% of the polymer units with quaternary amino units, said organic dichloride having the general formula Cl--R--Cl and R is --CH 2 ) n where n is 2-10, --CH 2 CH = CHCH 2 --, --CH 2 C.tbd.CCH 2 --, ##SPC4## or --CH 2 CH 2 --O--CH 2 CH 2 --.
Claim 2
Dependent Claim
115 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting a monoamine with an organic dichloride, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10% of the polymer units with quaternary amino units, said organic dichloride having the general formula Cl--R--Cl and R is --CH 2 ) n where n is 2-10, --CH 2 CH = CHCH 2 --, --CH 2 C.tbd.CCH 2 --, ##SPC4## or --CH 2 CH 2 --O--CH 2 CH 2 --.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the monoamine is a dialkylamine.
Claim 4
Dependent Claim
28 words
The process of claim 2 wherein the dialkylamine is diethylamine and the organic dichloride is 1,4-dichlorobutene, the polyquaternary amino polymer having recurring units of the idealized formula ##STR33##
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the monoamine is a heterocyclic amine.
Claim 6
Dependent Claim
29 words
The process of claim 4 wherein the heterocyclic amine is morpholine and the organic dichloride is 1,4-dichlorobutene, the polyquaternary amino polymer having recurring units of the idealized formula ##STR34##
Claim 7
Dependent Claim
80 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting diethylamine with epichlorohydrin, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10 percent of the polymer units with quaternary amino units and having recurring units of the idealized formula ##EQU2##
Claim 8
Dependent Claim
80 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting diethylamine with epichlorohydrin, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10 percent of the polymer units with quaternary amino units and having recurring units of the idealized formula ##EQU2##
Claim 9
Dependent Claim
82 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting still-bottom polyethylene polyamines containing primary, secondary, tertiary amino groups and heterocyclic amines with 1,4-dichlorobutene, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10 percent of the polymer units with quaternary amino units.
Claim 10
Dependent Claim
82 words
A process of inhibiting corrosion of metals including ferrous metals and alloys thereof in an acidic corrosive medium which comprises contacting said metals including ferrous metals and alloys thereof in said corrosive medium with a polyquaternary amino polymer prepared by reacting still-bottom polyethylene polyamines containing primary, secondary, tertiary amino groups and heterocyclic amines with 1,4-dichlorobutene, with or without final alkylation by a quaternizing agent, said polyquaternary amino polymer having at least about 10 percent of the polymer units with quaternary amino units.
References Cited (Backward Citations)
US325169A
Cited
US2947703A
Cited
US3079221A
Cited
US3233963A
Cited
US3235596A
Cited
US3642663A
Cited
US3288555A
Cited
US3414521A
Cited
US3514251A
Cited
US3669612A
Cited
US3488294A
Cited
US3687859A
Cited
US3696049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |