Linear polyphosphazenes and a process for their production
Patent 5382644 Issued on January 17, 1995. Estimated Expiration Date: 
August 10, 2012. 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.
August 10, 2012. 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 ReferencesCured phosphonitrilic elastomers having alkyl-substituted aryl units Process for the production of linear polyphosphazenes Patent #: 5138008 InventorsAssigneeApplicationNo. 927701 filed on 08/10/1992US Classes:528/30, From silicon-containing reactant having at least one polyvalent atom other than carbon, oxygen, or nitrogen528/21, Material is a nitrogen-containing compound528/23, Material contains a phosphorus or sulfur atom528/399Phosphorus reactant contains a nitrogen atomExaminersPrimary: Marquis, Melvyn I.Attorney, Agent or FirmForeign Patent References
International ClassC08G 077/22Foreign Application Priority Data1991-04-06 WOAbstractPolyphosphazenes are produced by polymerizing a silylated phosphinimine in the presence of an initiator, preferably an anionic initiator at temperatures below those typically necessary for such polymerization reactions. The polyphosphazenes obtained are suitable for use in the production of elastomeric and thermoplastic materials.Other References
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