Patent US4471097A successfully refreshed from Google Patents.
US4471097A
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Water soluble copolymers containing vinyl imidazole as drilling fluid additives
Assignee: Hoechst AG
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Filing: 1982-01-11
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Granted: 1984-09-11
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Expires: 2002-01-11
Abstract
Abstract Auxiliary agents for chemical flooding of petroleum deposits and auxiliary agents used in well drilling fluids are water-soluble copolymers containing a statistical distribution of (a) 5 to 95% by weight of structural units of formula I <IMAGE> (I) (b) 0 to 30% by weight of structural units of formula II <IMAGE> (II) (c) 0 to 80% by weight of structural units of formula III <IMAGE> (III) (d) 5 to 60% by weight of structural units of formula IV <IMAGE> (IV) wherein R1 and R2 are the same or different and represent hydrogen, methyl, or ethyl or together are trimethylene to cyclic pentamethylene; R3 represents hydrogen or methyl; R4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; Y is a single covalent bond or the formula -CO-NH-C(CH3)2-CH2-; and X+ is a cation.
Inventors
- 👤 Klaus Uhl
- 👤 James K. Bannerman
- 👤 Friedrich J. Engelhardt
- 👤 Arvind Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/58; C08F220/585; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
178 words
Water-soluble copolymers containing structural units of (a) 1 to 95% by weight of structural units of formula I ##STR20## (b) 0 to 30% by weight of structural units of formula II ##STR21## (c) 0 to 80% by weight of structural units of formula III ##STR22## (d) 5 to 60% by weight of structural units of formula IV ##STR23## (e) 0 to 50% by weight of structural units of formula V ##STR24## and (f) 0 to 25% by weight of a cross linking agent containing at least two olefinic double bonds; R 1 and R 2 are the same or different and represent hydrogen, methyl or ethyl or together are trimethylene to pentamethylene; R 3 and R 5 represents hydrogen or methyl; R 4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; R 6 represent hydroxy, alkoxycarbonyl with 1 to 12 carbon atoms in a alkoxy moiety cycloalkoxycarbonyl with 6 to 10 carbon atoms in cycloalkoxy moiety, phenyl, alkanoyloxy with 1 to 4 carbon atoms, or β-hydroxyalkoxy-carbonyl with 2 or 3 carbon atoms in hydroxyalkoxy moiety; X + is a cation.
Claim 2
Dependent Claim
178 words
Water-soluble copolymers containing structural units of (a) 1 to 95% by weight of structural units of formula I ##STR20## (b) 0 to 30% by weight of structural units of formula II ##STR21## (c) 0 to 80% by weight of structural units of formula III ##STR22## (d) 5 to 60% by weight of structural units of formula IV ##STR23## (e) 0 to 50% by weight of structural units of formula V ##STR24## and (f) 0 to 25% by weight of a cross linking agent containing at least two olefinic double bonds; R 1 and R 2 are the same or different and represent hydrogen, methyl or ethyl or together are trimethylene to pentamethylene; R 3 and R 5 represents hydrogen or methyl; R 4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; R 6 represent hydroxy, alkoxycarbonyl with 1 to 12 carbon atoms in a alkoxy moiety cycloalkoxycarbonyl with 6 to 10 carbon atoms in cycloalkoxy moiety, phenyl, alkanoyloxy with 1 to 4 carbon atoms, or β-hydroxyalkoxy-carbonyl with 2 or 3 carbon atoms in hydroxyalkoxy moiety; X + is a cation.
Claim 3
Dependent Claim
194 words
Water-soluble copolymers containing structural units of (a) 5 to 90% by weight of structural units of formula I ##STR25## (b) 5 to 30% by weight of structural units of formula II ##STR26## (c) 0 to 80% by weight of structural units of formula III ##STR27## (d) 5 to 60% by weight of structural units of formula IV ##STR28## (e) 0 to 50% by weight of structural units of formula V ##STR29## (f) 0 to 25% by weight of a crosslinking agent containing at least two olefinic double bonds; wherein R 1 and R 2 are the same or different and represent hydrogen, methyl or ethyl or together are trimethylene to pentamethylene; R 3 and R 5 represents hydrogen or methyl; R 4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; R 6 represent hydroxy, alkoxycarbonyl with 1 to 12 carbon atoms in a alkoxy moiety cycloalkoxycarbonyl with 6 to 10 carbon atoms in cycloalkoxy moiety, phenyl, alkanoyloxy with 1 to 4 carbon atoms, or β-hydroxyalkoxy-carbonyl with 2 or 3 carbon atoms in hydroxyalkoxy moiety; Y is a single covalent bond or the formula --CO--NH--C(CH 3 ) 2 --CH 2 --; and X + is a cation.
Claim 4
Dependent Claim
194 words
Water-soluble copolymers containing structural units of (a) 5 to 90% by weight of structural units of formula I ##STR25## (b) 5 to 30% by weight of structural units of formula II ##STR26## (c) 0 to 80% by weight of structural units of formula III ##STR27## (d) 5 to 60% by weight of structural units of formula IV ##STR28## (e) 0 to 50% by weight of structural units of formula V ##STR29## (f) 0 to 25% by weight of a crosslinking agent containing at least two olefinic double bonds; wherein R 1 and R 2 are the same or different and represent hydrogen, methyl or ethyl or together are trimethylene to pentamethylene; R 3 and R 5 represents hydrogen or methyl; R 4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; R 6 represent hydroxy, alkoxycarbonyl with 1 to 12 carbon atoms in a alkoxy moiety cycloalkoxycarbonyl with 6 to 10 carbon atoms in cycloalkoxy moiety, phenyl, alkanoyloxy with 1 to 4 carbon atoms, or β-hydroxyalkoxy-carbonyl with 2 or 3 carbon atoms in hydroxyalkoxy moiety; Y is a single covalent bond or the formula --CO--NH--C(CH 3 ) 2 --CH 2 --; and X + is a cation.
Claim 5
Dependent Claim
71 words
Water-soluble copolymers according to claim 1 or claim 2 containing a statistical distribution of (a) 20 to 80% by weight of formula I, (b) 0 to 15% by weight of formula II, (c) 0 to 40% by weight of formula III, (d) 5 to 50% by weight of formula IV, (e) 0 to 50% by weight of formula V, and (f) 0 to 25% by weight of divinylbenzene or trimethylolpropane triacrylate.
Claim 6
Dependent Claim
41 words
Water-soluble copolymers according to claim 1 or claim 2 wherein X + is sodium cation, potassium cation, or ##STR30## wherein each R 7 is the same or different and each is hydrogen, alkyl having 1 to 4 carbon atoms, or hydroxyethyl.
Claim 7
Dependent Claim
20 words
Water-soluble copolymers according to claim 1 or claim 2 wherein component (a) is 5 to 90% by weight of ##STR31##
Claim 8
Dependent Claim
33 words
Water-soluble copolymers according to claim 1 or claim 2 or claim 3 wherein up to 60% of the structural unit of formula III is in the hydrolyzed form of the formula VI ##STR32##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |