Tertiary-amino allyl-or xylyl-lithium initiators and method of preparing same
Patent 5521309 Issued on May 28, 1996. Estimated Expiration Date: December 23, 2014. 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.
540/612, The hetero ring is unsubstituted or alkyl substituted only260/665R, C-metal502/155, Including phosphorus or sulfur or compound containing nitrogen or phosphorus or sulfur502/157, Alkali metal bonded to carbon526/180, Contains compound of nitrogen540/450, The hetero ring contains at least eight members including nitrogen and carbon540/484, The hetero ring contains seven members including nitrogen and carbon546/192, Additional ring containing546/348, Unsubstituted or hydrocarbyl substituted only, or salt thereof546/350, Unsaturated hydrocarbyl side chain548/578, Benzene ring in a substituent attached to the ring nitrogen of the five membered hetero ring by nonionic bonding548/579, The five-membered hetero ring is unsubstituted or is alkyl substituted only (e.g., pyrrolidine, etc.)564/373, Alpha aralkyl benzyl amines564/391, Benzyl amines wherein the benzene ring has no other substituents564/509Carbon to carbon unsaturation containing
An anionic polymerization initiator includes the C-lithio reaction product of an organolithium compound and a tertiary-amino allyllithium or a tertiary-amino xylyllithium. When used in an anionic polymerization, a functional group from the initiator is incorporated onto the head of the growing polymer and a lithium atom is incorporated at the "living" end of the polymer chain prior to quenching. The initiator may be used to polymerize a monomer(s) including diolefin monomers, monovinyl aromatic monomers and trienes, and the living ends of the polymers are effectively maintained even at temperatures of up to 300° F. and higher. Such polymers exhibit an increased efficiency in coupling termination reactions, and products prepared from such polymers exhibit improved hysteresis characteristics. Products such as tires and the like can be prepared from such polymers and from vulcanizable elastomer compositions employing the polymers.
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December 23, 2014. 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.
