US4612332A
Expired / Lapsed
US
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Novel polymeric foams and foaming compositions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1985-12-12
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Granted: 1986-09-16
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Expires: 2005-12-12
Abstract
Abstract Surfactant-free stable aqueous foams may be produced by water soluble copolymers of acrylamide and N-alkylacrylamide with chain lengths greater than or equal to 6 carbons. Additionally, these polymers may contain an anionic monomer, such as a monovalent salt of acrylic acid. These copolymers and terpolymers are added to water or brine at a concentration of 0.005 to 2 parts per 100 of solvent. When the resulting solutions are subjected to intensive mixing with the addition of air or other gases, such as nitrogen or carbon dioxide, high quality, persistent foams are formed. These foams are formed at relatively low polymer concentrations without added surfactants. They have good high temperature stability and excellent salt tolerance.
Inventors
- 👤 Jan Bock
- 👤 Hartley H. Downs
- 👤 Donald B. Siano
- 👤 Salvatore J. Pace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J2333/00; C08J2333/24; C08J2333/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
150 words
A process for forming a foamed polymeric aqueous solution which comprises the steps of: (a) dissolving about 0.01 to about 5.0 parts by weight of a copolymer in 100 parts of weight of said water to form a solution, said copolymer having the formula: ##STR2## wherein R 1 , having about 6 to 22 carbons, 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 50.0 to about 99.0 mole percent; and y is about 10 to about 0.1 mole percent; z is about 0.0 to about 50.0 mole percent; and M + is an alkali metal or ammonium cation; (b) mixing said solution of said water and said copolymer with said gas under sufficient agitation conditions, at a sufficient temperature for a sufficient time to form said foamed polymeric aqueous solution.
Claim 2
Dependent Claim
150 words
A process for forming a foamed polymeric aqueous solution which comprises the steps of: (a) dissolving about 0.01 to about 5.0 parts by weight of a copolymer in 100 parts of weight of said water to form a solution, said copolymer having the formula: ##STR2## wherein R 1 , having about 6 to 22 carbons, 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 50.0 to about 99.0 mole percent; and y is about 10 to about 0.1 mole percent; z is about 0.0 to about 50.0 mole percent; and M + is an alkali metal or ammonium cation; (b) mixing said solution of said water and said copolymer with said gas under sufficient agitation conditions, at a sufficient temperature for a sufficient time to form said foamed polymeric aqueous solution.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein R is an alkyl group having about 6 to about 18 carbon atoms.
Claim 4
Dependent Claim
23 words
A process according to claim 1 wherein x is 84.0 mole percent; y is 1.0 mole percent; and z is 15.0 mole percent.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein x is about 90.0 to about 99.9 mole percent; y is about 0.1 to about 10.0 mole percent; and z is less than 0.5 mole percent.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein the oil soluble monomer of the copolymer is dodecylacrylamide.
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein the oil soluble monomer of the copolymer is octylacrylamide.
Claim 8
Dependent Claim
16 words
A solution according to claim 1 wherein the oil soluble monomer of the copolymer is hexylacrylamide.
Claim 9
Dependent Claim
16 words
A process according to claim 1 wherein the oil soluble monomer of the copolymer is decylacrylamide.
Claim 10
Dependent Claim
14 words
A process according to claim 1 wherein M + is sodium, potassium or ammonium.
Claim 11
Dependent Claim
12 words
A process according to claim 1 wherein said water is salt water.
Claim 12
Dependent Claim
28 words
A process according to claim 1 wherein the gas is selected from the group consisting of air, nitrogen, carbon dioxide, methane, ethane, propane and freon and mixtures thereof.
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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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |