| abstract |
(57) [Summary] (Modified) [Purpose] To increase the catalyst particle strength, improve the stereoregularity of the polymer obtained, maintain the high activity of the catalyst, and prevent performance deterioration during storage of the catalyst. [Structure] An α-olefin polymerization catalyst component obtained by prepolymerizing the following 1) component with an olefin in the presence of the following 2) compound and 3) compound. 1) Solid component containing magnesium, titanium, halogen and an electron donating compound as essential components, 2) Trialkylaluminum, 3) [R 1 is an aliphatic or alicyclic hydrocarbon group, R 2 is R 1 or OR 4 , R 3 is methyl or ethyl, x is 1 or 2, y Is 0 or 1, and z is 2 or 3]. |