Abstract: A method for producing a supported catalyst useful in polymerization of ethylene and copolymerization of ethylene and &agr;-olefin is disclosed. The method includes treating the magnesium-containing carrier with a titanium compound containing oxygen atom(s), wherein said carrier is obtained by reaction of an organomagnesium compound of the structure of MgPh2.nMgCl2.mR2O (n=0.37˜0.7; m≧1; R20=ether; Ph=phenyl) with an organic chloride compound in a mole ratio of organic chloride compound/Mg≧0.5, at −20˜80° C. In one embodiment, the organic chloride compound may be carbon tetrachloride. A specific catalyst is provided whose activity is low in the beginning but slowly rises to a sufficient degree as the process of polymerization progresses, the polymer produced with the use of said catalyst having high bulk density, a well adjusted particle size distribution, and a narrow molecular weight distribution.

Abstract: A method is proposed for producing a deposited catalyst for the polymerization of ethylene and copolymerization of ethylene with .delta.-olefins which involves the reaction of a solution of an organomagnesium compound of composition MgPh.sub.2.nMgCl.sub.2.mR.sub.2 O (wherein n=0.37-0.7; m.gtoreq.2, R.sub.2 O is a simple ether, Ph is C.sub.6 H.sub.5) with a carbon tetrachloride, at a molar ratio of CCl.sub.4 /Mg.gtoreq.0.5 and a temperature of -20.degree. to 60.degree. C.