Patent EP0057875A2 successfully refreshed from Google Patents.
EP0057875A2
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Water-dispersible hydrophobic thickening agent
Assignee: Dow Chemical Co
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Filing: 1982-01-29
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Granted: —
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Expires: 2002-01-29
Abstract
Abstract An aqueous liquid medium having increased low shear viscosity as provided by dispersing into the aqueous medium (1) a water-soluble polymer having pendant hydrophobic groups, e.g., an acrylamide/dodecyl acrylate copolymer, and (2) a water-dispersible surfactant, e.g., sodium oleate, or dodecyl polyethyleneoxy glycol monoether. The thickened aqueous medium is suitably employed in applications requiring viscous liquids which retain their viscosity when subjected to shear, heat or high electrolyte (salt) concentrations. Such applications include uses in enhanced oil recovery processes, as fluid mobility control agents, fracturing fluids and drilling muds, as well as hydraulic fluids and lubricants in many applications.
Inventors
- 👤 Syamalarao Evani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 11:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K3/00; C08; C08L; C08L33/00; C08L33/24; C08L33/26; C08L57/00; C09D; C09D7/00; C09D7/40; C09D7/43; C09K8/02; C09K8/03; C09K8/035; C09K8/58; C09K8/584; C09K8/588; C10; C10M; C10M173/00; C10M173/02; C08L2201/00; C08L2201/50; C08L33/04; C08L33/06; C08L33/10; C08L71/00; C08L71/02; C09K2208/00; C09K2208/28; C10M2201/00; C10M2201/02; C10M2207/00; C10M2207/04; C10M2207/046; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10M2207/20; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/107; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/024; C10M2217/026; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/042; C10M2219/044; C10M2221/00; C10M2221/02; C10M2225/00; C10M2225/02; C10N; C10N2010/00; C10N2010/02; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/01; Y; Y10; Y10S; Y10S507/00; Y10S507/926; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A thickening composition for aqueous ,liquids which composition comprises a water-soluble polymer having pendant hydrophobic groups and a water-dispersible surfactant having hydrophobic groups that are capable of associating with the hydrophobic groups of the polymer wherein the proportion of water-soluble polymer and surfactant is such that at ambient conditions, water containing 0.5 weight percent of the thickening composition has a viscosity at least twice the viscosity of water.
Claim 2
Dependent Claim
68 words
A thickening composition for aqueous ,liquids which composition comprises a water-soluble polymer having pendant hydrophobic groups and a water-dispersible surfactant having hydrophobic groups that are capable of associating with the hydrophobic groups of the polymer wherein the proportion of water-soluble polymer and surfactant is such that at ambient conditions, water containing 0.5 weight percent of the thickening composition has a viscosity at least twice the viscosity of water.
Claim 3
Dependent Claim
29 words
A thickened aqueous composition comprising an aqueous medium having dispersed therein the thickening composition of Claim 1 in an amount sufficient to increase the viscosity of said aqueous medium.
Claim 4
Dependent Claim
26 words
The composition of Claim 2 which also contains an amount of a water-soluble electrolyte which is sufficient to increase the viscosity of the thickened aqueous composition.
Claim 5
Dependent Claim
33 words
The composition of Claim 1, 2 or 3 wherein the water-soluble polymer is a copolymer of a water-soluble monomer and a hydrophobic monomer having a hydrophobic moiety of at least 8 carbon atoms.
Claim 6
Dependent Claim
44 words
The composition of Claim 4 wherein the surfactant is a nonionic surfactant selected from an alkyl polyethyleneoxy glycol monoether or alkylaryl polyethyleneoxy glycol monoether wherein alkyl has from 8 to 20 carbon atoms and from about 1 to 20 ethyleneoxy groups per polymer molecule.
Claim 7
Dependent Claim
99 words
The composition of Claim 1 wherein the water-soluble polymer is a copolymer of from 40 to 99.9 mole percent of acrylamide, from 0 to 50 mole percent of acrylic acid and from 0.1 to 10 mole percent of an alkyl methacrylate or acrylate wherein alkyl has from 8 to 12 carbon atoms, said polymer having a weight average molecular weight in the range from 800,000 to 3 million and the surfactant is an alkyl polyethyleneoxy glycol monoether wherein alkyl has from 8 to 20 carbon atoms and there are from 1 to 12 ethyleneoxy groups per molecule of surfactant.
Claim 8
Dependent Claim
54 words
An aqueous composition comprising an aqueous medium and the thickening composition of Claim 6 in an amount from 0.01 to 1 weight percent of the copolymer and from 0.0015 to 0.5 weight percent of the monoether and from 0.01 to 20 weight percent of an alkali metal salt or an alkaline earth metal salt.
Claim 9
Dependent Claim
60 words
The composition of Claim 1 wherein the polymer is a copolymer of from 60 to 99.9 mole percent of acrylamide, from 0 to 30 mole percent of acrylic acid and from 0.1 to 10 weight percent of dodecyl methacrylate and the surfactant is a dodecyl polyethyleneoxy glycol monoether wherein the monoether has from 1 to 10 ethyleneoxy groups per molecule.
Claim 10
Dependent Claim
38 words
The composition of Claim 8 wherein the copolymer is a copolymer from 99 to 99.9 mole percent of acrylamide and from 0.1 to 1 mole percent of dodecyl methacrylate and the monoether has 5 ethyleneoxy groups per molecule.
Claim 11
Dependent Claim
35 words
The composition of Claim 3 wherein the electrolyte is a salt of a mono- or divalent metal which salt is present in an amount from 0.01 to 15 weight percent based on the aqueous composition.
Claim 12
Dependent Claim
26 words
The composition of Claim 1 which contains from 0.01 to 1 weight percent of the polymer and from 0.0015 to 0.5 weight percent of the surfactant.
Claim 13
Dependent Claim
17 words
The composition of Claim 2 which contains from 0.025 to 5 weight percent of the thickening agent.
References Cited (Backward Citations)
No citation records indexed.
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