US4520182A
Expired / Lapsed
US
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Acrylamide-alkylacrylamide copolymers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-08-29
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Granted: 1985-05-28
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Expires: 2003-08-29
Abstract
Abstract Water soluble acrylamide/alkylacrylamide copolymers which are efficient viscosifiers of water or brine are described. They are made by processes which finely disperse the water insoluble alkylacrylamide into a water-external microemulsion or a micellar surfactant solution.
Inventors
- 👤 S. Richard Turner
- 👤 Donald B. Siano
- 👤 Jan Bock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:28
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; C09; C09K; C09K8/00; C09K8/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
A copolymer having the formula: ##STR3## wherein R 1 having about 6 to 22 carbon atoms, is an alkyl group, straight chained or branched or cycloalkyl group, R 2 is the same or different alkyl group as R 1 or hydrogen, x is about 90.0 to about 99.9 mole %, and y is about 10 to about 0.1 mole %, wherein the intrinsic viscosity of said copolymer is about 1 to about 10 dl/g.
Claim 2
Dependent Claim
74 words
A copolymer having the formula: ##STR3## wherein R 1 having about 6 to 22 carbon atoms, is an alkyl group, straight chained or branched or cycloalkyl group, R 2 is the same or different alkyl group as R 1 or hydrogen, x is about 90.0 to about 99.9 mole %, and y is about 10 to about 0.1 mole %, wherein the intrinsic viscosity of said copolymer is about 1 to about 10 dl/g.
Claim 3
Dependent Claim
20 words
A copolymer according to claim 1 wherein R is an alkyl group having about 6 to about 18 carbon atoms.
Claim 4
Dependent Claim
26 words
A copolymer according to claim 1, wherein x is about 90.0 to about 99.9 mole %, and y is about 0.1 to about 10.0 mole %.
Claim 5
Dependent Claim
12 words
A copolymer according to claim 1, wherein the copolymer is of acrylamide/dodecylacrylamide.
Claim 6
Dependent Claim
12 words
A copolymer according to claim 1, wherein the copolymer is of acrylamide/octylacrylamide.
Claim 7
Dependent Claim
12 words
A copolymer according to claim 1, wherein the copolymer is of acrylamide/hexylacrylamide.
Claim 8
Dependent Claim
12 words
A copolymer according to claim 1, wherein the copolymer is of acrylamide/decylacrylamide.
Claim 9
Dependent Claim
13 words
A copolymer according to claim 1, wherein the copolymer is of acrylamide/N,N-dioctyl acrylamide.
Claim 10
Dependent Claim
34 words
A copolymer as in any one of claims 1-3, wherein said copolymer is dissovled in water at a concentration level of about 0.03 to about 0.5 grams of copolymer per 100 grams of water.
Claim 11
Dependent Claim
49 words
A copolymer as in any one of claims 1-3, wherein said copolymer is dissolved in salt water at a concentration level of about 0.03 to about 0.5 grams of copolymer per 100 grams of water, said salt water having about 0.5 to about 10.0 wt.% of dissolved solid salts.
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |