C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/104, 402/556
C08F 4/22 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01)
Patent
CA 2024464
Case7345(2 ABSTRACT OF THE DISCLOSURE CHROMIUM-CONTAINING COMPLEX POLYMERISATION CATALYST 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: Image wherein - three of R1 to R5 are H and the other two are H, or Clue 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: Image 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.
Bp Chemicals Limited
Dawkins Gordon M.
Fetherstonhaugh & Co.
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