Process for the polymerization of olefins

Claim 2

The catalyst as claimed in claim 1 wherein the hydrolysis of the reaction product is carried out in an aqueous medium and the titanium halide is titanium tetrahalide.

Claim 3

The catalyst according to claim 1 wherein the reaction of the dried hydrolysate with the organo-aluminum compound is carried out at a temperature of from room temperature to 100* C.

Claim 4

The catalyst according to claim 1 wherein the ratio of aluminum atoms in the organo-aluminum compound to titanium atoms in the hydrolysate is 0.1 - 1.0 in terms of Al/Ti.

Claim 5

A catalyst, for the polymerization of olefins, prepared by reacting at a temperature of 50*-700* C. a titanium tetrahalide with a hydrothermally treated alumina to form a reaction product said alumina being produced by subjecting an alumina hydrate selected from the group consisting of low-crystalline alumina hydrate and amorphous alumina hydrate to hydrothermal treatment at a temperature above 100* C. and then calcining the hydrothermally treated alumina hydrate at a temperature of 300*-900* C. to dehydrate it; hydrolyzing the reaction product in an aqueous medium to obtain a hydrolysate; drying said hydrolysate at a temperature below 1,000* C; reacting the dried hydrolysate at a temperature below 150* C. with an organo-aluminum compound of the general formula AlRnX3 n wherein R represents a hydrocarbon group, X represents a halogen atom and n is 2-3, and then removing any unreacted organo-aluminum compound.

Claim 6

The catalyst according to claim 6 wherein the organo-aluminum compound is represented by the formula AlRnX3 n, R represents an alkyl group having one - 12 carbon atoms, X represents a halogen atom having an atomic weight greater than 35 and n is 2-3.

Claim 7

The catalyst according to claim 6 wherein the organO-aluminum compound is a trialkyl aluminum.

Claim 8

The catalyst according to claim 6 wherein the organo-aluminum compound is a dialkyl aluminum mono-chloride.

Claim 9

The catalyst accordinG to claim 6 wherein said hydrothermal treatment is carried out at a temperature of from 150*-350* C; said hydrothermally treated alumina hydrate is calcined at a temperature of 400*-700* C.; said reaction product is hydrolyzed in aqueous ammonia to obtain a hydrolysate wherein the ratio of chlorine atoms to titanium atoms in said hydrolysate is less than 0.1 in terms of Cl/Ti and wherein said hydrolysate is dried at a temperature of 300*-700* C.

Claim 10

A process for the polymerization of olefins, which comprises the steps of polymerizing said olefins, in an inert hydrocarbon, at a temperature ranging from room temperature to 300* C., under a pressure of 10-200 atm, and in the presence of hydrogen, with a catalyst produced by reacting a hydrothermally treated alumina with a titanium halide to form a reaction product, said alumina being produced by heating a low crystalline or amorphous alumina hydrate at a temperature of more than 100* C., in the presence of water and then calcining it at a temperature of about 300*-900* C. to dehydrate it; hydrolyzing the reaction product to form a hydrolysate containing substantially no residual halogen; drying the hydrolysate at a temperature below 1,000* C.; reacting the dried hydrolysate with an organo-aluminum compound at a temperature below 150* C., the ratio of aluminum atoms in the organo-aluminum compound to titanium atoms in the hydrOlysate being at least 0.03 in terms of Al/Ti; and then removing unreacted organo-aluminum compound.

Claim 11

The process according to claim 11 wherein the partial pressure of hydrogen is 1-500 percent of the partial pressure of said olefins.

Claim 12

The process according to claim 11 wherein the polymerization is conducted at a temperature of 50*-250* C.

Claim 13

The process according to claim 11 wherein said olefins are selected from the group consisting of ethylene and ethylene containing a small amount of propylene.