Patent EP0416785A2 successfully refreshed from Google Patents.
EP0416785A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Chronium-containing complex polymerisation catalyst
Assignee: BP Chemicals Ltd
•
Filing: 1990-08-23
•
Granted: —
•
Expires: 2010-08-23
Abstract
Abstract The present invention relates to an olefin polymerization obtainable by depositing on a dry inorganic oxide support at least one mononuclear chromium complex, which is 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 is one or more hydrocarbyl ligands which are sufficiently reactive to enable the complex to react with the inorganic oxide without thermal activation. The catalyst can be used without thermal activation for polymerizing olefins, particularly ethylene optionally with C₃₋₈ alpha-olefins. It produces polyolefins having broad molecular weight distribution.
Inventors
- 👤 Gordon Michael Dawkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:11
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
An olefin polymerization catalyst obtainable by depositing on a dry inorganic oxide support at least one mononuclear chromium complex characterised in that the mononuclear chromium complex is representable by the general formula:- wherein - four of the groups R₁ to R₅ of the substituted cyclopentadienyl ligand are individually 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 (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.
Claim 2
Dependent Claim
111 words
An olefin polymerization catalyst obtainable by depositing on a dry inorganic oxide support at least one mononuclear chromium complex characterised in that the mononuclear chromium complex is representable by the general formula:- wherein - four of the groups R₁ to R₅ of the substituted cyclopentadienyl ligand are individually 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 (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.
Claim 3
Dependent Claim
49 words
A catalyst as claimed in, claim 1 in which the reactive hydrocarbyl ligands are 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 is selected from substituted pentadienyl and 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
23 words
A catalyst as claimed in any one of claims 1 to 4 in which the inorganic oxide comprises a major amount of silica.
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
31 words
A catalyst as claimed in any one of claims 1 to 6 which has been thermally activated by heating at a temperature of 100 to 350°C, in a dry, inert atmosphere.
Claim 9
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 10
Dependent Claim
16 words
A process as claimed in claim 8 which is carried out in the presence of hydrogen.
Claim 11
Dependent Claim
14 words
A polymer obtainable by a process as claimed in claim 8 or claim 9.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.