| abstract |
A catalyst which is useful as a catalyst for producing stereoregular polyolefins by homo- or co-polymerization of alpha-olefins having 3 or more carbon atoms. The catalyst comprises: (A) a solid catalyst component obtained by reacting a homogeneous solution containing (i) at least one member selected from the group consisting of a combination of metallic magnesium and an organic hydroxy compound, and an oxygen-containing organic compound of magnesium, (ii) an electron-donating compound, and (iii) an oxygen-containing organic compound of titanium with (iv) at least one aluminium halide compound, and further reacting the resulting solid product with (v) an electron-donating compound and (vi) a titanium halide compound; (B) at least one member selected from the group consisting of organometallic compounds of metals of the groups ia, IIa, IIb, IIIb, and IVb of the periodic table; and (C) an electron-donating compound. This catalyst has a high polymerization activity, and provides polymers having high stereoregularity and excellent powder properties. |