C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/305
C08F 222/12 (2006.01) C08F 220/04 (2006.01) C08F 220/56 (2006.01) C09K 8/588 (2006.01) C09K 8/62 (2006.01) C10M 173/00 (2006.01) C10M 173/02 (2006.01)
Patent
CA 1270996
ABSTRACT The invention comprises a thickening agent comprising an aqueous-soluble polymeri- zation product of one or more water-soluble mono- mers which are sufficiently water-soluble to form at least a 10 weight percent solution when dis- solved in water and which undergo addition polym- erization to form polymers which are water-solu- ble; and at least one second monomer of the for- mula: Image III 32,120-F wherein R is a hydrocarbyl radical which contrib- utes hydrophobic character to the second monomer, Z is a divalent linking group, M is a divalent hydrocarbyl or substituted hydrocarbyl radical and Y is an ionic species which contributes hydro- philic character to the molecule. These compositions are useful for thick- ening aqueous mediums, in particular, for thicken- ing aqueous media containing water-soluble elector- lytes. Such thickened aqueous media retain their viscosity when subjected to shear, heat or high electrolyte concentrations. The thickened aqueous solutions may be used in enhanced oil recovery pro- cesses as fluid mobility control agents, fracturing fluids and drilling muds, as well as hydraulic fluids and lubricants. 32,120-F
523067
Evani Syamalarao
Phung Kien Van
Smart & Biggar
The Dow Chemical Company
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