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AssigneeFresenius Medical Care Holdings, Inc.
InventorsSelvaraj Savariar, Kevin Hudson, Geoffrey Andrew Russell, James Leslie White, Brett Allen Barton, Cheryl Ford, Jiunn Teo
Estimating the term…
A process for making polyarylethers provides a reaction mixture that includes a dipolar aprotic solvent for polyarylether and polyarylether forming reactants, and reacts the polyarylether-forming reactants, with removing of water with nitrogen in the absence of azeotrope forming cosolvent and optionally replacing removed amounts with dipolar aprotic solvent. The process can further include directly wet spinning the reactor solution without recovery of the polymer from the dipolar aprotic solvent through a spinneret to form hollow fibers or flat sheets suitable for membranes.
A process for preparation of at least one polyarylether comprising reacting polyarylether forming reactants in a reactor solution, said reaction solution comprising at least one polar aprotic solvent and the polyarylether forming reactants with removing of water in the absence of azeotrope forming cosolvent and adding fresh polar aprotic solvent to the reactor solution in substantially equal amount to any polar aprotic solvent removed from the reactor solution during the reacting, wherein the polar aprotic solvent is dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide, diphenylsulfone, or any combinations thereof.
A process for preparation of at least one polyarylether comprising reacting polyarylether forming reactants in a reactor solution, said reaction solution comprising at least one polar aprotic solvent and the polyarylether forming reactants with removing of water in the absence of azeotrope forming cosolvent and adding fresh polar aprotic solvent to the reactor solution in substantially equal amount to any polar aprotic solvent removed from the reactor solution during the reacting, wherein the polar aprotic solvent is dimethylacetamide, N-methylpyrrolidone, dimethylsulfoxide, diphenylsulfone, or any combinations thereof, said process is conducted with a stoichiometric excess of one of the two polyarylether forming reactants such that the final product contains substantially less of the stoichiometrically deficient reactant and the reaction is self-terminating.
Dependencies are inferred from the claim text.