Group 6 transition metal catalyst compound and use thereof
AssigneeExxonMobil Chemical Patents Inc.
InventorGlen E. Alliger
Life of this patent
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Abstract
This invention relates to a catalyst system comprising a half sandwich chromocene compound featuring a tethered P-donor, with an activator and optional supportation on silica which produces ethylene homopolymer or copolymer.
Claims29
A process to polymerize olefins comprising contacting ethylene and one or more alpha-olefins with a catalyst system comprising activator, catalyst compound, and support where the catalyst compound is represented by Formula I:
- where
- T is a bridging group represented by the formula, (R*2G)g, where each G is Si or Ge, g is 1, and each R* is, independently, hydrogen, halogen, C1 to C20 hydrocarbyl or a C1 to C20 substituted hydrocarbyl, and two or more R* optionally form a cyclic structure including a saturated cyclic or fused ring system;
- P is phosphorus;
- M* is Cr, Mo, or W;
- each X, is independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, dienes, amines, phosphines, ethers, and a combination thereof, including that two X's optionally form a part of a fused ring or a ring system;
- each R1, R2, R3, and R4 is independently, hydrogen, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group;
- and
- each R5 and R6 is, independently, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group, where the R5 and R6 groups optionally form a fused ring or multicenter fused ring system where the rings may be aromatic, partially saturated or saturated.
A process to polymerize olefins comprising contacting ethylene and one or more alpha-olefins with a catalyst system comprising activator, catalyst compound, and support, where the catalyst compound comprises one or more of:
- tetramethyl(diethylphosphinodimethylsilyl)cyclopentadienylchromium(III) dichloride,
- tetramethyl(diphenylphosphinodimethylsilyl)cyclopentadienylchromium(III) dichloride,
- tetramethyl(di-p-tolylphosphinodimethylsilyl)cyclopentadienylchromium(III) dichloride,
- tetramethyl(dicyclohexylphosphinodimethylsilyl)cyclopentadienylchromium(III) dichloride, and
- tetramethyl(di-t-butylphosphinodimethylsilyl)cyclopentadienylchromium(III) dichloride.
A process to polymerize olefins comprising contacting ethylene and one or more alpha-olefins with a catalyst system comprising activator, catalyst compound, and a support where the catalyst compound is represented by Formula I:
- where
- T is a bridging group represented by the formula, (R*2G)g, where each G is C, Si, or Ge, g is 1, and each R* is, independently, hydrogen, halogen, C1 to C20 hydrocarbyl or a C1 to C20 substituted hydrocarbyl, and two or more R* optionally form a cyclic structure including a saturated cyclic or fused ring system;
- P is phosphorus:
- M* is Cr, Mo, or W;
- each X, is independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, dienes, amines, phosphines, ethers, and a combination thereof, including that two X's optionally form a part of a fused ring or a ring system;
- each R1, R2, R3, and R4 is independently, hydrogen, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group;
- and
- each R5 and R6 is, independently, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group, where the R5 and R6 groups optionally form a fused ring or multicenter fused ring system where the rings are aromatic, partially saturated or saturated, and
- the support is silica.
Dependencies are inferred from the claim text.