Modified chromium-containing catalyst composition polymerization

Details Modified chromium-containing catalyst composition polymerization Modified chromium-containing catalyst composition polymerization

1988-10-24

1990-08-07

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263485, 526908, C08F 424, C08F 1002

Patent

active

049469142

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.

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patent: 4011382 (1977-03-01), Levine et al.
patent: 4368302 (1983-01-01), Downs
patent: 4374234 (1983-02-01), Sticklen et al.

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