Olefin polymerization catalysts and method for preparation of same

Claim 2

CATALYSTS FOR THE POLYMERIZATION OF OLEFINS CONSISTING ESSENTIALLY OF A PRECIPITATE, PREPARED BY THE REACTION AT A TEMPERATURE WITHIN THE RANGE OF -20* TO 150*C IN AN INERT SOLVENT OF (1) AN ALIPHATIC ORGANO-MAGNESIUM COMPOUND, SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL FORMULAE

Claim 3

Catalysts as claimed in claim 1 in which the halogen atom of the transition metal compound is chlorine.

Claim 4

Catalysts as claimed in claim 1 in which the monohalogenated hydrocarbon is selected from the group consisting of chloro and bromo derivatives of saturated aliphatic hydrocarbons.

Claim 5

In a method for preparing catalysts for the polymerization of olefins, preparing a precipitate by reacting (1) monohalogenated hydrocarbon, (2) an aliphatic organo-magnesium compound selected from the group consisting of compounds having the general formulae R''-Mg-X and R''-Mg-R'''' in which R'' and R'''' represent an aliphatic hydrocarbon radical and X represents a halogen atom, and (3) a transition metal compound selected from the group consisting of a titanium derivative having the general formula TiX4 m(OR)m in which X represents a halogen atom, R represents an alkyl radical having from 2-8 carbon atoms and m is an integer within the range of 0-4, vanadium tetrachloride, vanadium tetrabromide, vanadium oxychloride and vanadium oxybromide, in which the reaction is carried out at a temperature within the range of -20* to 150*C in amounts such that the ratio between the number of transition metal atoms and the number of magnesium atoms of the organo-magnesium compound is up to 0.33, the ratio between the number of organic radicals of the monohalogenated hydrocarbons and the number of organic radicals of the organo-magnesium compounds is at least equal to 1, and separating the precipitate from the reaction mixture.

Claim 6

In a method for preparing catalysts for the polymerization of olefins, preparing a precipitate by reacting (1) monohalogenated hydrocarbon, (2) an aliphatic organo-magnesium compound selected from the group consisting of compounds having the general formulae R''-Mg-X and R''-Mg-R'''' in which R'' and R'''' represent an aliphatic hydrocarbon radical and X represents a halogen atom, and (3) a transition metal compound selected from the group consisting of a titanium derivative having the general formula TiX4 m(OR)m in which X represents a halogen atom, R represents an alkyl radical having from 2-8 carbon atoms and m is an integer within the range of 0-4, vanadium tetrachloride, vanadium tetrabromide, vanadium oxychloride and vanadium oxybromide, in which the reaction is carried out at a temperature within the range of -20* to 150*C in amounts such that the ratio between the number of transition metal atoms and the number of magnesium atoms of the organo-magnesium compound is up to 0.33, the ratio between the number of organic radicals of the monohalogenated hydrocarbons and the number of organic radicals of the organo-magnesium compounds is at least equal to 1, and separating the precipitate from the reaction mixture.

Claim 7

The method as claimed in claim 4 in which the reactants are employed in amounts such that the ratio between the number of transition metal atoms and the number of magnesium atoms of the organo-magnesium compounds is within the range of 0.25 to 0.3, the ratio between the number of organic radicals of the monohalogenated hydrocarbons and the number of organic radicals of the organo-magnesium compounds is within the range of 1 to 2.