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AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsTadashi Takahashi, Kazuhiro Yamamoto, Katsumi Hirakawa
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The present invention provides a powder catalyst composition for producing by gas-phase polymerization olefin polymers having excellent polymer qualities and good particle properties in a high yield. The powder catalyst composition comprises fine particles of the following Component (B) coated with the following Component (A), and is characterized in that the ratio of the Component (A) to the Component (B) based on percent by weight ranges from 5:50 to 95:50: Component (A): an inorganic compound in the form of fine particles having an average particle diameter of 0,003-1 .mu.m and mainly comprising an inorganic oxide, and Component (B): a solution or dispersion in a hydrocarbon of the following Sub-components (i) and (ii): Sub-component (i): a compound of a transition metal belonging to the IVB group of the Periodic Table, and Sub-component (ii): an alumoxane, a Lewis acid, or an ionic compound which can convert the Sub-component (i) upon reaction therewith into a cation. A process for polymerizing an olefin with use of the composition is also disclosed.
A powder catalyst composition which comprises fine particles of Component (B), which is a solution or dispersion in a hydrocarbon of a Sub-component (i) which is a compound of a transition metal belonging to the IVB Group of the Periodic Table and a Sub-component (ii) which is an alumoxane, a Lewis acid, or an ionic compound which can convert the Sub-component (i) upon reaction therewith into a cation, coated with Component (A), which is an inorganic compound in the form of fine particles comprising mainly an inorganic oxide and having an average particle diameter of from 0.005 to 0.4 .mu.m, in a weight ratio of the Component (A) to the Component (B) of from 15:85 to 40:60,
Dependencies are inferred from the claim text.