Catalyst dispersion having improved stability against phase sepa

Details Catalyst dispersion having improved stability against phase sepa Catalyst dispersion having improved stability against phase sepa

1983-03-28

1984-07-24

Garvin, Patrick

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

Catalyst or precursor therefor

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

502110, 502132, 502108, 526125, C08F 464

Patent

active

044618468

ABSTRACT:
Catalysts for the polymerization of ethylene or its copolymerization with C.sub.3 -C.sub.2 alpha-monoolefins are often pre-activated by polymerizing a small amount of C.sub.4 -C.sub.12 alpha-monoolefin onto the catalyst in the presence of an alkyl aluminum compound. The resultant pre-activated catalyst component is used in the form of a dispersion in an inert solvent. The dispersions have a tendency to separate into two phases rapidly and are thus difficult to add uniformly to a polymerization reaction. When the alkyl aluminum compound is replaced by a synergistic mixture of an alkyl aluminum choride and an oxygen-containing aluminum compound having oxygen attached to at least one aluminum valence, a stable dispersion is formed which will not separate into two phases for long periods of time.

REFERENCES:
patent: 3445443 (1969-05-01), Sasaki et al.
patent: 3784539 (1974-01-01), Ort
patent: 4086185 (1978-04-01), Shirai et al.
patent: 4287328 (1981-09-01), Kikuta et al.

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