Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Patent
1987-05-28
1989-01-31
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
502306, B01J 2106, B01J 2108, B01J 2110, B01J 2326
Patent
active
048015725
ABSTRACT:
A modified supported catalyst for polymerizing alpha-olefins, for example, ethylene, is prepared by combining a chromium compound-containing catalyst with a modifier which is an oxide of an element of Group II A of the Periodic Chart of the Elements. The resulting modified catalyst composition, when used to polymerize alpha-olefins, produces polymer resins having higher values of High Load Melt Index (I.sub.21) than catalyst compositions without the modifier.
There is also disclosed a process for polymerizing alpha-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.
REFERENCES:
patent: 2846425 (1958-08-01), Hogan et al.
patent: 3996163 (1976-12-01), Crump et al.
patent: 4368302 (1983-01-01), Downs
patent: 4374234 (1983-02-01), Stricklen et al.
Hsieh et al., U.S. patent application Ser. No. 056,178, filed May 28, 1987 and Hsieh et al., U.S. patent application Ser. No. 111,944, filed Oct. 21, 1987.
Aksman Stanislaus
Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Shine W. J.
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