Solution of dilithium polymerization initiator
Patent 6613858 Issued on September 2, 2003. Estimated Expiration Date: 
January 10, 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.
January 10, 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 ReferencesOrgano-lithium compounds and a process for their preparation Preparation of conjugated diene-monoalkenyl arene block copolymers having a low polydispersity index 1,5-diethenylnaphthalene compounds and bifunctional primers for anionic polymerization prepared therefrom Patent #: 5674799 InventorsAssigneeApplicationNo. 09/959431 filed on 01/10/2002US Classes:526/340, Interpolymerized with aromatic hydrocarbon260/665R, C-metal502/157, Alkali metal bonded to carbon525/331.9, Polymer derived from monomer containing at least two ethylenic groups or diene rubber525/332.9, Interpolymer with aromatic hydrocarbon526/173, Material contains elemental alkali metal, hydride thereof, or alkali metal to carbon atom bond (Li, Na, K, Rb, Cs, Fr)526/335From hydrocarbon monomer containing at least two ethylenic groups, e.g., butadiene, etc.ExaminersPrimary: Teskin, FredAttorney, Agent or FirmInternational ClassesC08F 36/04 (20060101)C08F 36/00 (20060101) C08F 297/00 (20060101) C08F 297/04 (20060101) Foreign Application Priority Data1998-08-31 JPAbstractA block copolymer having narrow molecular weight distribution and excellent symmetrical property or a telechelic polymer having, equally at both terminals thereof, a functional group can be produced by using a polymerization initiator solution which comprises a dilithium polymerization initiator having an average number of functional groups of 1.8 to 2.0/molecule and a solvent selected from aliphatic hydrocarbon compounds and alicyclic compounds and is free of a polar substance.Other References
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