Water-dispersible hydrophobic thickening agent
Patent 4432881 Issued on February 21, 1984. Estimated Expiration Date: 
February 21, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 21, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2816882 3039529 3350338 3583486 3624019 3739848 3744566 3891591 Process for displacing oil using aqueous anionic surfactant systems containing aromatic ether polysulfonates Process for the secondary and tertiary recovery of petroleum InventorApplicationNo. 06/232327 filed on 02/06/1981US Classes:507/121, Sulfur is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamidoalkane sulfonates, etc.)166/275, Injected fluid comprises water and material other than inorganic gas507/118, Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.)507/119, Polymer derived from acrylic acid monomer or derivative507/120, Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.)507/122, Sulfur is attached directly or indirectly to the ethylenic monomer by nonionic bonding507/123, Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding507/125, Carbocyclic ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding (e.g., styrene, vinyl toluene, etc.)507/136, Organic component contains ether linkage (e.g., PEG ether, etc.)507/225, Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.)507/261, Organic component contains ether linkage (e.g., PEG ether, etc.)507/926, PACKER FLUID507/936, Flooding the formation516/102, The organic material contains organic compound containing nitrogen, except if present solely as NH4+516/104, The organic material contains organic compound containing oxygen516/108, The compound contains carboxylic acid ester group (e.g., glycerides)516/109, The compound contains -C(=O)OH or salt thereof (e.g., calcium stearate)524/375, Phenoxy group524/401, Inorganic compound devoid of a silicon atom DNRM524/423, Sulfate group, e.g., calcium sulfate, etc.524/436, Group IIA metal DNRM (i.e., Be, Mg, Ca, Sr, Ba)524/555From nitrogen-containing monomer other than acrylonitrile or methacrylonitrileExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC08L 33/26 (20060101)C08L 57/00 (20060101) C09K 8/60 (20060101) C09K 8/035 (20060101) C09K 8/62 (20060101) C09K 8/58 (20060101) C09K 8/588 (20060101) C09K 8/02 (20060101) C10M 173/02 (20060101) C09D 7/00 (20060101) C08L 33/00 (20060101) C08L 71/00 (20060101) C08L 71/02 (20060101) AbstractAn 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 emloyed 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. |
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