Chelating resins and method for their use in the extraction of metal ions
Patent 5200473 Issued on April 6, 1993. Estimated Expiration Date: 
December 23, 2011. 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.
December 23, 2011. 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 ReferencesPolymer bound multidentate complexes Reaction products of a polyacrylamide formaldehyde, a secondary amine and an-nh group-containing functional derivative of an acid Polymer bound multidentate complexes Blends of acrylamide polymers and Mannich bases Patent #: 4789695 InventorApplicationNo. 812760 filed on 12/23/1991US Classes:525/381, Three or more amine groups521/30, Chemically treated solid polymer521/31, Solid polymer derived from ethylenically unsaturated reactant only521/32, Treated with nitrogen-containing material525/153, With saturated ketone reactant or polymer thereof; or with solid copolymer derived from at least one ketone reactant wherein at least one of the reactants forming the solid copolymer is saturated; or with SPFI wherein at least one of the necessary ingredients is a ketone or with a reaction product thereof; or with a SICP containing a ketone group525/329.4, Polymer derived from acrylamide or methacrylamide monomer525/329.9, Nitrogen containing chemical treating agent525/330.4, Sulfur or phosphorus containing chemical treating agent525/374, Chemical treating agent is a nitrogen-containing compound525/379, Organic amine525/380, Amine contains a hydroxyl group525/382, Two amine groups525/383Chemical treating agent contains elemental oxygen or oxygen-containing compoundExaminersPrimary: Schofer, Joseph L.Assistant: Zitomer, Fred Attorney, Agent or FirmInternational ClassC08F 008/32Foreign Application Priority Data1988-03-25 CHAbstractFor the preparation of hydrophilic polymer resins with functional groups on ligands, one reacts a resin which consists of units of formula I, in which R1 is hydrogen or an aliphatic residue, with a ligand in the presence of a coupling agent. The reaction is conducted in the presence of a competitive agent which is capable of reacting with the coupling agent at approximately the same rate as the amido group, to achieve a statistical limitation of the reaction of the coupling agent with the polymer. The competitive agent must not react with the resin.The resin is used for the recovery of metal ions from effluents or natural or industrial residual waters.Field of SearchChemical treating agent is a nitrogen-containing compoundThree or more amine groups Polymer derived from acrylamide or methacrylamide monomer Nitrogen containing chemical treating agent Chemical treating agent contains elemental oxygen or oxygen-containing compound With saturated ketone reactant or polymer thereof; or with solid copolymer derived from at least one ketone reactant wherein at least one of the reactants forming the solid copolymer is saturated; or with SPFI wherein at least one of the necessary ingredients is a ketone or with a reaction product thereof; or with a SICP containing a ketone group Treated with nitrogen-containing material Solid polymer derived from ethylenically unsaturated reactant only Chemically treated solid polymer | |
