EP0509294A2
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EP
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Cyclopentadienyl group 6b metal-alpha-olefin polymerization catalysts and process for polymerizing alpha-olefins
Assignee: Chevron USA Inc
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Filing: 1992-03-27
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Granted: —
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Expires: 2012-03-27
Abstract
Abstract Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a cyclopentadienyl Group 6b metal hydrocarbyl compound in which the metal has an oxidation state of +3, said Group 6b metal compound being supported on an inorganic support. The catalyst system may also contain a Group 2 or Group 3 metal alkyl compound.
Inventors
- 👤 Michael J. Carney
- 👤 David L. Beach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:29
CPC Classifications
C; C08; C08F; C08F10/00; C08F110/00; C08F110/02; C08F2410/00; C08F2410/03; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63908; C08F4/63912; C08F4/63916
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
46 words
A catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a cyclopentadienyl Group 6b metal hydrocarbyl Compound in which the metal has an oxidation state of +3, said Group 6b metal compound being supported on an inorganic support.
Claim 2
Dependent Claim
16 words
A catalyst system of claim 1, having additionally a group 2 or 3 metal alkyl compound.
Claim 3
Dependent Claim
19 words
The catalyst system of claim 1 or 2 wherein the hydrocarbyl is sigma bonded to the Group 6b metal.
Claim 4
Dependent Claim
18 words
The catalyst system of claim 1 or 2 wherein the group 6b metal compound is a chromium compound.
Claim 5
Dependent Claim
132 words
The catalyst system of claim 4 wherein the chromium compound has the formula: (C₅(R')₅) a CrX b (L) (I) [(C₅(R')₅) a CrX b ] c (II) or [(C₅(R')₅) a CrX b (L) m ]⁺ [A]⁻ (III) wherein (C₅(R')₅) is a cyclopentadienyl or substituted cyclopentadienyl ring; R' is at each independent occurrence hydrogen, a hydrocarbyl radical having 1-20 carbon atoms, or adjacent R' groups may together form one or more rings; X is a hydrocarbyl radical having 1-20 carbon atoms; a = 1 or 2, b = 1 or 2 where a+b = 3; c = 1 or 2 with the proviso that when c = 2 then X is alkyl; L is at each independent occurrence a sigma donor stabilizing ligand; m = 1 to 2 inclusive; and A is an anion.
Claim 6
Dependent Claim
42 words
The catalyst system of claim 5 wherein the chromium compound is selected from Cp*Cr(CH₃)₂(THF) [Cp*Cr(CH₃)₂]₂ [Cp*Cr(THF)₂CH₃]+ [BPh₄]⁻ Cp*Cr(Bzyl)₂(THF) Cp*Cr(TMSM)₂ Cp*Cr(CH₃)₂(Pyr) Cp*Cr(TMSM)₂(Pyr) Cp*Cr(Bzyl)₂(Pyr) where Cp* is pentamethylcyclopentadienyl, THF is tetrahydrofuran, Ph is phenyl, Bzyl is benzyl, TMSM is trimethylsilylmethyl and Pyr is pyridine.
Claim 7
Dependent Claim
20 words
The catalyst system of claim 1 or 2 wherein the support is an inorganic metal oxide or inorganic metal phosphate.
Claim 8
Dependent Claim
27 words
The catalyst system of Claim 7 wherein the support is selected from the group consisting of alumina, silica, silica-alumina, aluminum phosphate, zirconium phosphate, and alumina aluminum phosphate.
Claim 9
Dependent Claim
19 words
The catalyst system of Claim 8 wherein the support is selected from silica, aluminum phosphate and alumina aluminum phosphate.
Claim 10
Dependent Claim
13 words
The catalyst system of Claim 9 wherein the support is alumina aluminum phosphate.
Claim 11
Dependent Claim
20 words
The catalyst system of Claim 2 wherein the Group 2 or Group 3 metal alkyl compound is an alkylaluminum compound.
Claim 12
Dependent Claim
25 words
The catalyst system of Claim 11 wherein the alkylaluminum compound is selected from the group consisting of trialkylaluminum compounds, alkylaluminum alkoxides, alkylaluminum halides and aluminoxanes.
Claim 13
Dependent Claim
16 words
The catalyst system of Claim 12 wherein the alkylaluminum compound is an aluminoxane or trialkylaluminum compound.
Claim 14
Dependent Claim
45 words
The catalyst system of Claim 2 wherein the Group 6b metal compound is selected from Cp*Cr(CH₃)₂(THF) [Cp*Cr(CH₃)₂]₂ [Cp*Cr(THF)₂CH₃]+ [BPh₄]⁻ or Cp*Cr(Bzyl)₂(THF) or Cp*Cr(TMSM)₂, Cp*Cr(CH₃)₂(Pyr) Cp*Cr(TMSM)₂(Pyr) Cp*Cr(Bzyl)₂(Pyr) the support is silica or alumina aluminum phosphate, and the alkylaluminum compound is an aluminoxane or a trialkylaluminum compound.
Claim 15
Dependent Claim
13 words
The catalyst system of Claim 14 wherein the support is alumina aluminum phosphate.
Claim 16
Dependent Claim
55 words
A process for the homopolymerization or copolymerization of alpha-olefins comprising polymerizing said alpha-olefin, or copolymerizing two or more alpha-olefins in the presence of a catalyst system comprising a cyclopentadienyl Group 6b metal hydrocarbyl compound in which the metal has an oxidation state of +3, said group 6b metal compound being supported on an inorganic support.
Claim 17
Dependent Claim
14 words
The process of claim 16, wherein the alpha-olefins have 2 to 8 carbon atoms.
Claim 18
Dependent Claim
20 words
The process of claim 16 or 17, using a catalyst system of one or more of claims 1 to 15.
References Cited (Backward Citations)
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