B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 20/26 (2006.01) A61L 15/60 (2006.01) B01D 15/04 (2006.01) C08F 220/34 (2006.01) C08F 220/60 (2006.01) C08F 246/00 (2006.01) C08F 251/00 (2006.01) C08F 255/02 (2006.01)
Patent
CA 2044776
The present invention provides crosslinked ampholytic copolymers that are highly absorbent to aqueous electrolyte solutions. The polymers of the present invention comprise polymers formed by the copolymerization of an effective amount of each of the following components to produce a polymer which is highly absorbent to aqueous electrolyte solutions: (a) an ampholytic ion pair monomer comprising (i) the ammonium cation 2-methacryloyloxyethyldimethylammonium and (ii) a sulfonate anion selected from the group consisting of 2-acrylamido-2-methylpropane sulfonate, 2-methacryloyloxyethane sulfonate, vinyl sulfonate, styrene sulfonate and any combination of two or more therof: (b) at least one comonomer selected from the group consisting of acrylamide, methacrylamide, acrylonitrile, acrylic acid, methacrylic acid, alkali salts of acrylic acid, alkali salts of methacrylic acid, 2- methacryloyloxyethyldimethylamine, 2-acrylamido-2-methylpropane sulfonic acid, alkali salts of 2-acrylamido-2-methylpropane sulfonic acid, 2- methacryloyloxyethane sulfonic acid, alkali salts of 2-methacryloyloxyethane sulfonic acid, N-vinyl-2-pyrrolidone and any combination of two or more thereof;and (c) at least one crosslinking agent which has at least two polymerizable olefinic functionalities wherein the olefinic functionalities are suitable for crosslinking. The invention also provides a method of using the polymers of the present invention for absorbing an aqueous electrolyte solution comprising the step of contacting the polymers of the present invention with the aqueous electrolyte solution.
Ahmed Iqbal
Hsieh Henry L.
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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