Superabsorbent crosslinked ampholytic ion pair copolymers containing 2-methacryloyloxyethyldimethylammonium
October 12, 2010. 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 3050390 3478001 Amphoteric polyelectrolyte Gelled compositions and well treating Particulate dispersions Drag reduction agents for aqueous salt solutions Water soluble copolymers containing vinyl imidazole as drilling fluid additives Composite mixtures for improving gel strength of water absorbent gels Production of high molecular weight vinyl lactam polymers and copolymers Water absorbent crosslinked polymer and a method of producing the same containing cellulosis fibers InventorsAssigneeApplicationNo. 596180 filed on 10/12/1990US Classes:526/240, From metal containing monomer526/287From monomer containing three or more oxygen atoms bonded to a single sulfur atom, e.g., sulfonate, etc.ExaminersPrimary: Henderson, ChristopherAttorney, Agent or FirmInternational ClassC08F 228/02AbstractThe 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 thereof;(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-methacryloyloyloxyethane 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.Other References
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