Prepolymer catalysts suitable for preparing spandex fibers
Patent 6906163 Issued on June 14, 2005. Estimated Expiration Date: 
May 30, 2022. 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.
May 30, 2022. 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 3180854 3384623 3393243 3427256 3427334 3427335 3483167 3829505 Polyethers and method for making the same Process for preparing polyols InventorsAssigneeApplicationNo. 10158988 filed on 05/30/2002US Classes:528/55, Material contains at least one metal atom528/56, Material contains a transition metal atom528/57, Material contains at least one group IA or group IIA metal atom528/58, Material contains at least one atom of tin528/61, With organic nitrogen reactant which contains two NH, =NH, or HNH groups528/64, Organic NH, =NH or HNH nitrogen reactant contains a carbocyclic or aromatic ring528/906, FIBER OR ELASTOMER PREPARED FROM AN ISOCYANATE REACTANT568/618, Preparing from organic hydroxy containing compound (H of -OH may be replaced by a Group IA or IIA light metal)544/398, Chalcogen attached indirectly to the piperazine ring by nonionic bonding521/159, N=C=X reactant having at least two C-NH-C(=X)- groups, e.g., prepolymers, etc.536/120, Ethers252/182.27, Reactant contains ether linkage524/591Water DNRMExaminersPrimary: Gorr, RachelAttorney, Agent or FirmForeign Patent References
International ClassC08G018/16AbstractSegmented polyurethane/ureas useful for the production of spandex, particularly spandex fibers, are made from isocyanate-terminated prepolymers formed by reacting excess isocyanate with an isocyanate-reactive component satisfying specified compositional requirements in the presence of a catalyst which promotes linear polymerization but does not cause degradation of the polymer. Suitable catalysts include metal salts of organic fatty acids and/or of naphthenic acid. The isocyanate-reactive component includes at least 10 equivalent percent of a polyoxypropylene diol having a number average molecular weight of at least about 1500 Da and an average unsaturation level less than or equal to 0.03 meq/g and up to 90 equivalent percent of a polytetramethylene glycol having a number average molecular weight of at least 200 Da.Other References
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