Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Solid catalyst component and catalyst for olefin polymerization
 The present invention is a solid catalyst component for polymerization of olefins prepared by contacting a magnesium compound, a tetravalent halogen-containing titanium compound, a diester of an aromatic dicarboxylic acid, an aromatic hydrocarbon and an organic aluminum compound containing a hydroxyl group represented by the following general formula (R.sup.1 CO.sub.2).sub.m Al(OH).sub.3-m or aluminum hydroxide. The catalyst for polymerization of olefins comprising said solid catalyst component, an organic aluminum compound represented by the general formula R.sup.2.sub.p AlQ.sub.3-p and an organic silicon compound represented by the general formula R.sup.3.sub.q Si(OR.sup.4).sub.4-q can retard the rate of forming a polymer having a low molecular weight or a low stereoregular polymer which is soluble in a polymerization solvent in slurry polymerization and can obtain a high stereoregular polymer in a high yield, and also can obtain a copolymer having an excellent property in a high yield in the copolymerization of olefins. 
Toho Titanium Co., Ltd.
C
C08F
inventional
Takuo Masayoshi Isa
Kataoka Saito Nishiyama