Modified polymers prepared with lanthanide-based catalysts
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United States of America Patent
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Mar 2, 2010
Grant Date -
Feb 2, 2006
app pub date -
Oct 5, 2005
filing date -
Nov 12, 1999
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Abstract
A functionalized polymer prepared by a process comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, the polymer having greater than about 85 percent in the 1,4-cis microstructure and less than about 3 percent in the 1,2- or 3,4-microstructure, and reacting the pseudo-living polymer with at least one functionalizing agent defined by the formula (I) or (II):and Z are substituents that will not protonate a pseudo-living polymer.
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