The present invention relates to a catalyst for homo-polymerization or
co-polymerization of ethylene, or more particularly to a solid complex
titanium catalyst for homo-polymerization or co-polymerization of
ethylene. The catalyst may be produced by preparing a magnesium solution
by contact-reacting a magnesium halide compound with an alcohol. Reacting
the solution with an ester compound and a boron compound. Then reacting
the solution with a mixture of a titanium compound and a silicon
compound.