Chemically reducing solids which may be applied to the polymeriz

Details Chemically reducing solids which may be applied to the polymeriz Chemically reducing solids which may be applied to the polymeriz

1976-12-09

1978-10-31

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526151, 526159, 526169, C08F 464, C08F 468, C08F 462

Patent

active

041233867

ABSTRACT:
An olefin polymerization catalyst is prepared in two steps. In the first step, a chemically reducing solid is prepared by polymerizing an olefin in contact with solid particles of a compound of a transition metal from sub-groups IV A, V A and VI A in a lower valency state in the presence of an organomagnesium compound and terminating the polymerization when the quantity of olefin polymerized is from 50 mg.-50 g. per mg-atom of transition metal. In the second step, the chemically reducing solid prepared in the first step is contacted with reducible compounds of transition metals from sub-groups IV A, V A and VI A to effect reduction thereof.

REFERENCES:
patent: 3878124 (1975-04-01), Durand et al.
patent: 3922322 (1975-11-01), Roger et al.
Lapporte et al., J. Org. Chem. 28, (Jul. 1963), pp. 1947-1948.

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