Process for preparing physically stable quaternary ammonium anion exchange resins by chloromethylation and amination in the absence of additional organic solvent
Patent 4207398 Issued on June 10, 1980. Estimated Expiration Date: 
September 27, 1998. 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.
September 27, 1998. 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 3311602 3549562 3817878 InventorAssigneeApplicationNo. 05/946295 filed on 09/27/1978US Classes:521/31, Solid polymer derived from ethylenically unsaturated reactant only521/32, Treated with nitrogen-containing material525/359.3Organic halogen-containing compound contains oxygenExaminersPrimary: Schofer, Joseph L.Assistant: Kulkosky, Peter F. Attorney, Agent or FirmInternational ClassesB01J 41/14 (20060101)B01J 41/00 (20060101) C08F 8/00 (20060101) C08F 8/44 (20060101) AbstractCrosslinked quaternary ammonium anion exchange resins having a copolymer backbone containing a major amount of units derived from at least one non-polar aromatic monovinyl monomer and a minor amount of units derived from at least one polar functionally substituted comonomer, and characterized by improved physical stability, are prepared by an improved process, wherein the improvement comprises haloalkylating the aromatic nuclei of the copolymer backbone and aminolyzing the intermediate copolymer in the absence of added organic solvent. | |
