Catalysts for olefin polymerization
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United States of America Patent
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Dec 27, 2011
Grant Date -
Dec 15, 2011
app pub date -
Jun 9, 2010
filing date -
Jun 9, 2010
priority date (Note) -
Expired
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Abstract
Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a bridged cyclopentadienyl complex that incorporates a monoanionic hydroxylamido or hydrazido ligand fragment. Suitable complexes have the structure:can be joined together; n is 0 when X is O, and n is 1 when X is N; each Y is independently halide, alkyl, dialkylamido, aryl, or aralkyl. A modeling approach is used to identify particular valuable complexes, each of which incorporates a readily synthesized cyclopentadienyl precursor.
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