Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1987-05-28
1989-03-28
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502104, 502113, 502117, 502171, 526114, 526129, 526169, C08F 462
Patent
active
048164321
ABSTRACT:
A modified catalyst for polymerizing alpha-olefins, for example, ethylene, is prepared by combining a chromium-compound-comprising catalyst, supported on a refractory oxide support with at least one catalyst modifier of the formula R Mg R' where R and R' are the same or different C.sub.1 -C.sub.12 hydrocarbyl, alkoxy, alkenoxy or aryloxy groups. The amount of the modifier is such that the modified catalyst composition has the molar ratio of magnesium to chromium of about 0.2 to about 1.25. The modified catalyst composition produces resins of relatively high HLMI at relatively low temperatures.
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 modified catalyst composition. The resulting polymers can be used for the fabrication of blow-molded products, e.g., household and industrial containers.
REFERENCES:
patent: 3351623 (1967-11-01), Walker et al.
patent: 4146695 (1979-03-01), de Leemput
patent: 4368302 (1983-01-01), Downs
patent: 4374234 (1983-02-01), Stricklen et al.
patent: 4670413 (1987-06-01), Furtek
Aksman Stanislaus
Garvin Patrick P.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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