US 4,379,760 A · High efficiency catalyst for polymerizing olefins

Abstract

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and a hydrocarbyloxy titanium oxide such as di(isopropoxy) titanium oxide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies than those catalysts employing either of the titanium compounds alone.

Claims7

Dependent claims

In a catalytic reaction product of (A) a tetravalent titanium compound;

(B) an organomagnesium component;
and (C) a halide source, however if either component (B) or (C) does not contain sufficient quantities of aluminum, then (D) an organoaluminum compound is also present, said catalytic reaction product having atomic ratios of
Mg:Ti is from about 1:1 to about 200:1;
Al:Ti is from about 0.1:1 to about 1000:1;
excess X:Al is from about 0.0005:1 to about 5:1;
the improvement which comprises employing as the tetravalent titanium compound, a mixture of (a) a tetrahydrocarbyloxytitanium compound and (b) a dihydrocarbyloxytitanium oxide in a molar ratio of (a):(b) of from about 0.1:1 to about 10:1;
and wherein excess X is the amount of excess halide above that which would be theoretically required to convert the magnesium compound to the dihalide.

4 more elements

Dependencies are inferred from the claim text.

High efficiency catalyst for polymerizing olefins

Life of this patent

High efficiency catalyst for polymerizing olefins

Life of this patent

Abstract

Claims7