Process for the production of a catalyst component for use in the polymerization of alphaolefins

Claim 1

A process for the production of a catalyst component for use in the polymerization of α-olefins which comprises reducing titanium tetrachloride at a temperature of from -50° to +30° C. with an organoaluminum compound or mixture of such compounds having the general formula A1R n X 3-n wherein R represents a hydrocarbon group having 1 to 18 carbon atoms, X represents a halogen atom and n represents a number expressed as 0<n≦3, to obtain a brown or black-brown titanium trichloride reduced solid containing aluminum compounds, removing aluminum compounds contained in said reduced solid, and thereafter contacting said reduced solid in an inert diluent and at a temperature within the range of from -30° to 100° C. for at least 30 minutes with an activator which is a complex or mixture of titanium tetrachloride and a dialkyl ether wherein the mole ratio of dialkyl ether to titanium tetrachloride is at least 0.1 and the concentration of titanium tetrachloride is maintained at at least 1 volume percent of the liquid phase, said dialkyl ether having the formula R'OR", in which R' and R" are the same or different and each are selected from the group consisting of (a) alkyl groups having 1 to 4 carbon atoms, (b) normal alkyl groups having 5 carbon atoms, and (c) alkyl groups having 6-20 carbon atoms.