EP0416786A2
Expired / Lapsed
EP
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Chromium-containing complex polymerisation catalyst
Assignee: BP Chemicals Ltd
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Filing: 1990-08-23
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Granted: —
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Expires: 2010-08-23
Abstract
Abstract The present invention relates to an olefin polymerisation catalyst obtainable by depositing on a dry inorganic oxide support a mononuclear chromium complex which is a mixture of (A) a first mononuclear chromium complex represented by the general formula: wherein - three of R₁ to R₅ are H and the other two are H, or C₁-3 hydrocarbyl group, and - L is one or more hydrocarbyl ligands which are sufficiently reactive to enable the complex to react with the inorganic oxide without thermal activation, and (B) a second mononuclear chromium complex representable by the general formula: wherein - the cyclopentadienyl ligand is substituted with 4 or 5 hydrocarbyl groups (R1-R5) containing 1 to 3 carbon atoms, and - L has the same definition as above, being identical or different. The catalyst can be used for polymerising olefins, particularly ethylene optionally with C₃-8 alpha-olefins. It can be thermally activated before use in olefin polymerisation. It produces polyolefins having a relatively broad molecular weight distribution, the breadth and shape of which being easily controlled.
Inventors
- 👤 Gordon Michael Dawkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 18:08
CPC Classifications
C; C08; C08F; C08F4/00; C08F10/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
An olefin polymerization catalyst obtainable by depositing on a a dry inorganic oxide a mononuclear chromium complex characterised in that the mononuclear chromium complex is a mixture of: (A) a first mononuclear chromium complex representable by the general formula: wherein - three of R₁ to R₅ are H and the other two are individually H, methyl, ethyl, isopropyl or n-propyl and - L is one or more hydrocarbyl ligand (depending on the coordination sites available on the chromium) which ligands are sufficiently reactive to enable the complex to react with the inorganic oxide without thermal activation and (B) a second mononuclear chromium complex representable by the general formula: wherein - four of the groups R₆ to R₁₀ of the substituted cyclopentadienyl ligand are indivdually selected from the group consisting of methyl, ethyl, isopropyl and n-propyl and the fifth is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl and hydrogen and - L is one or more hydrocarbyl ligands having the same definition as above, the hydrocarbyl ligands L of the first (A) and second (B) mononuclear chromium complexes being identical or different.
Claim 2
Dependent Claim
184 words
An olefin polymerization catalyst obtainable by depositing on a a dry inorganic oxide a mononuclear chromium complex characterised in that the mononuclear chromium complex is a mixture of: (A) a first mononuclear chromium complex representable by the general formula: wherein - three of R₁ to R₅ are H and the other two are individually H, methyl, ethyl, isopropyl or n-propyl and - L is one or more hydrocarbyl ligand (depending on the coordination sites available on the chromium) which ligands are sufficiently reactive to enable the complex to react with the inorganic oxide without thermal activation and (B) a second mononuclear chromium complex representable by the general formula: wherein - four of the groups R₆ to R₁₀ of the substituted cyclopentadienyl ligand are indivdually selected from the group consisting of methyl, ethyl, isopropyl and n-propyl and the fifth is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl and hydrogen and - L is one or more hydrocarbyl ligands having the same definition as above, the hydrocarbyl ligands L of the first (A) and second (B) mononuclear chromium complexes being identical or different.
Claim 3
Dependent Claim
57 words
A catalyst as claimed in claim 1 in which the reactive hydrocarbyl ligand of the first and/or second mononuclear chromium complex is selected from the group consisting of: (a) cyclopentadienyl, (b) cyclopentadienyl substituted with one or two groups individually selected from methyl, ethyl, isopropyl and n-propyl, (c) pentadienyl, (d) substituted pentadienyl, (e) allyl and (f) substituted allyl.
Claim 4
Dependent Claim
38 words
A catalyst as claimed in claim 2 in which the reactive hydrocarbyl ligand L is substituted pentadienyl or substituted allyl either of which is substituted with up to three groups individually selected from methyl, ethyl, isopropyl and n-propyl.
Claim 5
Dependent Claim
27 words
A catalyst as claimed in claim 2 in which the reactive hydrocarbyl ligand L is selected from the group consisting of cyclopentadienyl, allyl, 2,4-dimethyl-pentadienyl, 2-methyl-pentadienyl and pentadienyl.
Claim 6
Dependent Claim
51 words
A catalyst as claimed in any one of claims 1 to 4 in which the mixture of the first (A) and second (B) mononuclear chromium complexes deposited onto the inorganic oxide is such that the ratio by weight of chromium of (A) to chromium of (B) is from 95:5 to 5:95.
Claim 7
Dependent Claim
40 words
A catalyst as claimed in any one of claims 1 to 5 in which the amount of chromium deposited on the inorganic oxide is from 0.01 to 10% by weight of the total weight of the complex and inorganic oxide.
Claim 8
Dependent Claim
34 words
A catalyst as claimed in any one of claims 1 to 6 in which the catalyst has been thermally activated by heating at a temperature of 100°C to 350°C in a dry inert atmosphere.
Claim 9
Dependent Claim
36 words
A process for producing a catalyst as claimed in any one of claims 1 to 7, in which the first (A) and second (B) monochromium complexes are simultaneously or sequentially deposited on the same inorganic oxide.
Claim 10
Dependent Claim
40 words
A process for the production of polyolefins comprising contacting the olefin monomer or monomers with an olefin polymerization catalyst as claimed in any one of claims 1 to 7 at a temperature and pressure sufficient to initiate the polymerization reaction.
Claim 11
Dependent Claim
11 words
A polymer obtainable by a process as claimed in claim 9.
References Cited (Backward Citations)
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