Powder catalyst composition and process for polymerizing olefins

Details Powder catalyst composition and process for polymerizing olefins Powder catalyst composition and process for polymerizing olefins

1993-09-22

1995-12-12

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

502103, 502117, 502113, 502120, 502152, 502153, B01J 3100

Patent

active

054749620

ABSTRACT:
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.

REFERENCES:
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patent: 4931517 (1990-06-01), Fujita
patent: 5026797 (1991-06-01), Takahashi
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patent: 5126301 (1992-06-01), Tsutsui et al.
patent: 5214114 (1993-05-01), Takahashi et al.
patent: 5308811 (1994-05-01), Suga et al.

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