Catalyst for polymerization of olefins and process for preparing the same

Claim 1

A process for preparing a solid catalyst for the polymerization of olefins which comprises the steps of (1) reducing titanium tetrachloride with an organoaluminum compound represented by the formula R.sub.n AlX.sub.3.sub.-n (I) wherein R represents a straight chain or branched chain alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group or an aromatic hydrocarbon group, X represents a halogen atom, and n is a value of from 1 to 3, inclusive, (2) reacting the resulting β - type titanium trichloride with a complexing agent, (2) reacting the solid catalyst thus obtained with an organoaluminum compound represented by the formula R'.sub.m AlX.sub.3.sub.-m (II) wherein R' represents a straight chain or branched chain alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group or an aromatic hydrocarbon group, X represents a halogen atom, and m is a value of 0<m<1.5, and (4) reacting the resulting solid catalyst with a complexing agent wherein said complexing agent is selected from the group consisting of N,N-dimethylformamide, N,N-dimethylacetamide, N,N-dimethylpropionamide, N,N,N',N'-tetramethylurea, diethyl ether, di-n-propyl ether, diisopropyl ether, di-n-butyl ether, diisobutyl ether, di-tert-butyl ether, di-n-amyl ether, diisoamyl ether, dineopentyl ether, di-n-hexyl ether, di-n-octyl ether, diphenyl ether, di-o-tolyl ether, di-p-tolyl ether, dicyclohexyl ether, diethyl sulfide, di-n-propyl sulfide, di-n-butyl sulfide, di-tert-butyl sulfide, diphenyl sulfide, trimethylamine, triethylamine, tri-n-butylamine, triphenylamine, pyridine, quinoline, sym-triazine, N,N-dimethylaniline, N,N-diethylaniline and N,N,N',N'-tetramethylethylenediamine.