Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Boron or compound containing same
Patent
1989-12-21
1991-04-09
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Boron or compound containing same
502242, 502309, 502320, B01J 2102, B01J 2106, B01J 2108, B01J 2326
Patent
active
050065068
ABSTRACT:
A modified supported catalyst composition for polymerizing olefins, particularly alpha-olefins, for example, ethylene or ethylene and 1-hexane, is prepared by combining a chromium compound-containing catalyst with a modifier which is an oxide of an element of Group IIIA of the Periodic Table of the Elements. The modifier contains a small quantity of water. The resulting modified catalyst composition produces polymer resins having higher values of High Load Melt Index -HLMI (I.sub.21) than catalyst compositions without the modifier.
There is also disclosed a process for polymerizing olefins, at relatively lower temperatures than was heretofore possible, to obtain resins of relatively high HLMI, using the above-identified modified catalyst composition. The resulting polymers can be used for the fabrication of blow-molded products, e.g., household and industrial containers.
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Hsieh John T. T.
Pruden Ann L.
McKillop Alexander J.
Mobil Oil Corporation
Schneller Marina V.
Shine W. J.
Speciale Charles J.
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