Spandex elastomers
Patent 5691441 Issued on November 25, 1997. Estimated Expiration Date: 
October 11, 2016. 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.
October 11, 2016. 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 3393243 3427256 3427334 3427335 3829505 Polyethers and method for making the same Urethane elastomers prepared from polyethers having a certain molecular weight distribution Process for preparing polyols Polyurethane elastomers prepared from high equivalent weight polyahls InventorsAssigneeApplicationNo. 728922 filed on 10/11/1996US Classes:528/61, 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 ring528/76, With ether or thioether compound containing at least two -C-X-C- groups528/77, Ether or thioether compound contains three or more -XH groups528/906, FIBER OR ELASTOMER PREPARED FROM AN ISOCYANATE REACTANT560/26, Polyoxy alcohol moiety560/115, Alicyclic carbamates560/158, Polycarbamic560/330, Isocyanate esters (i.e., compounds containing the isocyanate group, -N=C=O, bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon)560/336, Processes560/355, Acyclic carbon bonded directly to the isocyanate group560/358Benzene ring bonded directly to the isocyanate groupExaminersPrimary: Sergent, RabonAttorney, Agent or FirmInternational ClassesC08G 018/12C08G 018/48 C07C 269/02 AbstractSubstitution of from 5 to 50 equivalent percent of an ultra-low unsaturation polyoxypropylene diol for PTMEG in isocyanate-terminated prepolymers used in spandex production is found to lower considerably both prepolymer viscosity and hysteresis while substantially retaining other desirable physical properties. Such products may offer higher fiber production rates than are possible while employing an all PTMEG-derived polymer.Other References
Field of SearchWith organic nitrogen reactant which contains two NH, =NH, or HNH groupsOrganic NH, =NH or HNH nitrogen reactant contains a carbocyclic or aromatic ring With ether or thioether compound containing at least two -C-X-C- groups FIBER OR ELASTOMER PREPARED FROM AN ISOCYANATE REACTANT Ether or thioether compound contains three or more -XH groups Polyoxy alcohol moiety Alicyclic carbamates Polycarbamic Isocyanate esters (i.e., compounds containing the isocyanate group, -N=C=O, bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) Processes Acyclic carbon bonded directly to the isocyanate group Benzene ring bonded directly to the isocyanate group |
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