A solid titanium complex catalyst for polymerization and copolymerization
of ethylene is prepared by the process comprising: (1) preparing a
magnesium solution by reacting a halogenated magnesium compound with an
alcohol; (2) reacting the magnesium solution with an ester compound having
at least one hydroxyl group and a boron compound having at least one
alkoxy group to produce a magnesium composition; and (3) producing a solid
titanium catalyst through recrystallization by reacting the magnesium
composition solution with a mixture of a titanium compound and a
haloalkane compound; and optionally reacting the solid titanium catalyst
with an additional titanium compound. The solid titanium complex catalyst
for polymerization and copolymerization of ethylene according to present
invention exhibits high catalytic activity and can be advantageously used
in the polymerization and copolymerization of ethylene to produce polymers
of high bulk density, narrow particle size distribution and small amount
of fine particles.
