Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1979-05-04
1981-04-21
Garvin, Patrick
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252441, 526125, 526126, 526159, C08F 464, C08F 462
Patent
active
042631700
ABSTRACT:
A catalyst comprising the product obtained by bringing into contact (a) a compound of magnesium comprising at least one species selected from the group consisting of magnesium monohalides (MgX), halo-magnesium hydrides (HMgX) and magnesium hydride (MgH.sub.2), X being a halogen and the said species MgX or HMgX being obtained by thermal decomposition of a powdery organo-magnesium halide R.sub.1 MgX wherein R.sub.1 is an organic radical; and (b) at least one halide of a transistion metal selected from the group consisting of titanium and vandium, the valency of said metal in said halide being lower than or equal to 3, the quantities of (a) and (b) being such that the atomic ratio of magnesium to said transistion metal is between 1 and 25, and a catalyst system including the catalyst that is suitable for use in the polymerization of olefins and particularly ethylene.
REFERENCES:
patent: 3048571 (1962-08-01), Stroh et al.
patent: 3058969 (1962-10-01), Coover et al.
patent: 3216988 (1965-11-01), Coover et al.
patent: 3478008 (1969-11-01), Ledbetter
patent: 3770657 (1973-11-01), Haag et al.
patent: 3784481 (1974-01-01), Lassau et al.
patent: 3969332 (1976-07-01), Gloriod et al.
Garvin Patrick
Societe Chimique des Charbonnages - CdF CHIMIE
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