PURPOSE: To provide the high-performance solid catalyst component which, when used in ethylene polymerization, gives polyethylene having an average mol.wt. of about 1,500,000 or higher, a small average particle diameter, a narrow particle size distribution, and a high bulk density in a high yield.
CONSTITUTION: Diethoxymagnesium is mixed with tetraisopropoxytitanium or tetrakis(2-ethylhexyloxy)titanium with heating to obtain a homogeneous solution. The solution is contacted with silicon tetrachloride in the presence of an inert solvent at -20 to 10°C, and then heated to a temp. not lower than 40°C but not higher than the b.p. of the solvent to react the reactants. The resulting finely particulate solid composition is contacted with titanium tetrachloride in the presence of a sorbitan/fatty acid ester, and then heated at 40-130°C in the presence of an aromatic dicarboxylic diester to obtain the objective solid catalyst component.
MARUYAMA TAKEYASU
TSUKAMOTO HIDEO
