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US4172055A
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Mixture of hydroxypropylcellulose and poly(maleic anhydride/alkene-1) as a hydrocolloid gelling agent
Assignee: Stein Hall and Co Inc
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Filing: 1978-04-03
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Granted: 1979-10-23
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Expires: 1998-04-03
Abstract
Abstract In one embodiment this invention provides a novel fluid composition which comprises an aqueous medium which is thickened with a synergistic viscosity mixture of hydroxypropylcellulose and poly(maleic anhydride/alkene-1).
Inventors
- 👤 Ronald N. DeMartino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C06; C06B; C06B47/00; C06B47/14; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284; C09D; C09D135/00; C09D7/00; C09D7/40; C09D7/43; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C08L35/00; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
A hydraulic fluid composition which comprises an aqueous solution containing (1) between about 0.05 and 5 weight percent, based on the weight of water, of a mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10; and (2) between about 0.01 and 25 weight percent, based on the weight of gelling agent, of a breaker additive for subsequent reduction of solution viscosity.
Claim 2
Dependent Claim
111 words
A hydraulic fluid composition which comprises an aqueous solution containing (1) between about 0.05 and 5 weight percent, based on the weight of water, of a mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10; and (2) between about 0.01 and 25 weight percent, based on the weight of gelling agent, of a breaker additive for subsequent reduction of solution viscosity.
Claim 3
Dependent Claim
128 words
A hydraulic fracturing fluid composition comprising (1) an aqueous medium; (2) between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic viscosity mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10; (3) between about 0.01 and 25 weight percent, based on the weight of gelling agent, of a breaker additive for subsequent autonomous reduction of the gelling properties of the mixture of hydroxypropylcellulose and maleic anhydride/alkene-1 copolymer; and (4) a propping agent.
Claim 4
Dependent Claim
128 words
A hydraulic fracturing fluid composition comprising (1) an aqueous medium; (2) between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic viscosity mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10; (3) between about 0.01 and 25 weight percent, based on the weight of gelling agent, of a breaker additive for subsequent autonomous reduction of the gelling properties of the mixture of hydroxypropylcellulose and maleic anhydride/alkene-1 copolymer; and (4) a propping agent.
Claim 5
Dependent Claim
24 words
A hydraulic fracturing fluid composition in accordance with claim 2 wherein the maleic anhydride/alkene-1 copolymer component in the gelling agent is maleic anhydride/isobutylene copolymer.
Claim 6
Dependent Claim
20 words
A hydraulic fracturing fluid composition in accordance with claim 2 wherein the breaker additive is an acid or ester compound.
Claim 7
Dependent Claim
18 words
A hydraulic fracturing fluid composition in accordance with claim 2 wherein the breaker additive is an oxidizing compound.
Claim 8
Dependent Claim
16 words
A hydraulic fracturing fluid composition in accordance with claim 2 wherein the propping agent is sand.
Claim 9
Dependent Claim
94 words
A thickened aqueous composition having a pH in the range of between about 6 and 11, and containing between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic hydrocolloid mixture of hydroxypropylcellulose (average M.S. between about 2 to 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10.
Claim 10
Dependent Claim
94 words
A thickened aqueous composition having a pH in the range of between about 6 and 11, and containing between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic hydrocolloid mixture of hydroxypropylcellulose (average M.S. between about 2 to 5) and maleic anhydride/alkene-1 copolymer as a gelling agent, wherein the alkene-1 contains between 2 and about 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10.
Claim 11
Dependent Claim
25 words
An aqueous composition in accordance with claim 7 wherein the hydroxypropylcellulose component in the gelling agent has a molecular weight of at least about 800,000.
Claim 12
Dependent Claim
31 words
An aqueous composition in accordance with claim 7 wherein the maleic anhydride/alkene-1 copolymer component in the gelling agent is maleic anhydride/isobutylene copolymer containing the copolymerized monomers in about an equimolar ratio.
Claim 13
Dependent Claim
48 words
An aqueous composition in accordance with claim 7 wherein the maleic anhydride/alkene-1 copolymer is a high molecular weight maleic anhydride/isobutylene copolymer having a specific viscosity of at least 2.5 as determined in a solution of one gram of copolymer in one hundred milliliters of MEK at 25° C.
Claim 14
Dependent Claim
90 words
A process for increasing the viscosity of an aqueous medium which comprises incorporating therein between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic viscosity mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent; wherein the alkene-1 contains between about 2 and 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10.
Claim 15
Dependent Claim
90 words
A process for increasing the viscosity of an aqueous medium which comprises incorporating therein between about 0.05 and 5 weight percent, based on the weight of water, of a synergistic viscosity mixture of hydroxypropylcellulose (average M.S. between about 2 and 5) and maleic anhydride/alkene-1 copolymer as a gelling agent; wherein the alkene-1 contains between about 2 and 6 carbon atoms, the gelling agent components are in a relative ratio between about 95:5 and 5:95 weight percent, and the specific viscosity of the copolymer component is between about 0.1 and 10.
Claim 16
Dependent Claim
20 words
A process in accordance with claim 11 wherein the maleic anhydride/alkene-1 component of the gelling agent is maleic anhydride/isobutylene copolymer.
Claim 17
Dependent Claim
37 words
A process in accordance with claim 11 wherein the incremental synergistic increase in viscosity is at least 100 percent greater than the calculated additive viscosity contributions of the hydroxypropylcellulose and maleic anhydride/alkene-1 components of the gelling agent.
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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |