Method for preparing polyacrylonitrile copolymers by heterogeneous reaction of polyacrylonitrile aquagel
Patent 4943618 Issued on July 24, 1990. Estimated Expiration Date: 
December 18, 2007. 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 18, 2007. 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 ReferencesInventorsAssigneeApplicationNo. 135070 filed on 12/18/1987US Classes:525/340, Chemical treating agent contains a phosphorus atom525/329.1, Polymer derived from acrylonitrile or methacrylonitrile monomer525/329.2, Interpolymers525/329.3, Contains monomer having two or more ethylenic groups525/344, Inorganic sulfur compound contains sulfur atom bonded to at least two oxygen atoms525/353, Sulfur compound contains sulfur atom bonded to at least two oxygen atoms, e.g., sulfonate, etc.525/355, Chemical treating agent contains hydrogen halide, elemental halogen, organic halogen-containing compound, or compound containing only halogen atoms525/366, Contains Group IA (Li, Na, K, Rb, Cs, Fr) or Group IIA (Be, Mg, Ca, Sr, Ba, Ra) elemental metal or compound thereof525/367, Elemental metal or inorganic metal compound525/368, Metal oxide525/369, Metal hydroxide525/377, Nitrogen-containing compound contains at least one nitrile or isonitrile group; or a nitrogen-to-oxygen bond which is other than as an amine or ammonium salt525/386Oxygen compound is a carboxylic acid, ester, anhydride, or lactone thereofExaminersPrimary: Schofer, Joseph L.Assistant: Lipman, Bernard Attorney, Agent or FirmInternational ClassC08F 008/40AbstractA method is disclosed for preparing polyacrylonitrile copolymers by Heterogeneous reaction of polyacrylonitrile aquagel. Generally, the method includes the steps of preparing a solution of polyacrylonitrile by dissolving the polyacrylonitrile in a water-miscible solvent which is capable of dissolving the polyacrylonitrile but incapable of hydrolyzing the nitrile groups of the polyacrylonitrile under the dissolution conditions. Coagulating the polyacrylonitrile solution by replacing the solvent with a coagulating fluid such as water or a water-miscible fluid incapable of dissolving polyacrylonitrile at temperatures below 80° C. and incapable of reacting with the nitrile groups of the polyacrylonitrile, thus obtaining the polymer in the aquagel state. Replacing the coagulating fluid with a fluid reagent capable of reacting with the nitrile groups of the polyacrylonitrile aquagel but incapable of dissolving the polyacrylonitrile aquagel at the selected reaction temperature. Allowing the fluid reagent to chemically react with the nitrile groups of the aquagel while the polyacrylonitrile aquagel is undissolved to form a copolymer product.The copolymer product is then either used in further chemical reactions involving newly formed and/or original side substituents, or isolated and utilized for molding or shaping into various articles. Various plasticizers, which when undiluted are capable of dissolving polyacrylonitrile, may be added to the copolymer product to assist in molding or shaping the material into an article.Other References
Field of SearchPolymer derived from acrylonitrile or methacrylonitrile monomerInterpolymers Contains monomer having two or more ethylenic groups Contains Group IA (Li, Na, K, Rb, Cs, Fr) or Group IIA (Be, Mg, Ca, Sr, Ba, Ra) elemental metal or compound thereof Elemental metal or inorganic metal compound Metal oxide Metal hydroxide Chemical treating agent contains a phosphorus atom Inorganic sulfur compound contains sulfur atom bonded to at least two oxygen atoms Sulfur compound contains sulfur atom bonded to at least two oxygen atoms, e.g., sulfonate, etc. Chemical treating agent contains hydrogen halide, elemental halogen, organic halogen-containing compound, or compound containing only halogen atoms Nitrogen-containing compound contains at least one nitrile or isonitrile group; or a nitrogen-to-oxygen bond which is other than as an amine or ammonium salt Oxygen compound is a carboxylic acid, ester, anhydride, or lactone thereof | |
