US4650848A
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Terpolymers of acrylamide, alkylacrylamide and betaine monomers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1985-12-30
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Granted: 1987-03-17
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Expires: 2005-12-30
Abstract
Abstract A water soluble terpolymer having the structure: <IMAGE> wherein x is selected from the group consisting of <IMAGE> <IMAGE> wherein x is about 1 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R2 is an alkyl group of 1-5 carbon atoms; R3 is an alkyl group of 3 to 4 carbon atoms; R4 is an alkyl group of 1-5 carbon atoms; and R5 is an alkyl group of 4-20.
Inventors
- 👤 Donald N. Schulz
- 👤 Ilan Duvdevani
- 👤 Jan Bock
- 👤 Enock Berluche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:28
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/34; C08F220/52; C08F220/54; C08F220/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A water soluble terpolymer having the structure: ##STR9## wherein x is selected from the group consisting of ##STR10## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5 mole percent; R 1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20.
Claim 2
Dependent Claim
93 words
A water soluble terpolymer having the structure: ##STR9## wherein x is selected from the group consisting of ##STR10## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5 mole percent; R 1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20.
Claim 3
Independent Claim
113 words
A method for increasing the viscosity of an aqueous solution which comprises the step of dissolving in said aqueous solution a water soluble terpolymer having the structure: ##STR11## wherein x is selected from the group consisting of ##STR12## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R 1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20.
Claim 4
Independent Claim
113 words
A method for increasing the viscosity of an aqueous solution which comprises the step of dissolving in said aqueous solution a water soluble terpolymer having the structure: ##STR11## wherein x is selected from the group consisting of ##STR12## wherein x is about 70 to about 95 mole percent; y is about 0.1 to about 5.0 mole percent; R 1 is methyl or hydrogen; z is about 1 to about 30 mole percent; R 2 is an alkyl group of 1-5 carbon atoms; R 3 is an alkyl group of 3 to 4 carbon atoms; R 4 is an alkyl group of 1-5 carbon atoms; and R 5 is an alkyl group of 4-20.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |