Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael Lester Kerns0
Steven Kristofer Henning0
Date of Patent
December 26, 2006
Patent Application Number
11120227
Date Filed
July 25, 2005
Patent Primary Examiner
Patent abstract
This invention is based upon the discovery that rubbery polymers having a high vinyl content and a low degree of branching can be synthesized with an initiator system that is comprised of (a) a lithium initiator selected from the group consisting of allylic lithium compounds and benzylic lithium compounds, (b) a Group I metal alkoxide, and (c) a polar modifier; wherein the molar ratio of the Group I metal alkoxide to the polar modifier is within the range of about 0.1:1 to about 10:1; and wherein the molar ratio of the Group I metal alkoxide to the lithium initiator is within the range of about 0.01:1 to about 20:1. These high vinyl polymers offer reduced levels of hysteresis and better functionalization efficiency.
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