A solid catalyst component for olefin polymerization characterized by being formed from (a) a magnesium compound, (b) titanium tetrachloride, (c) a phthalic diester and a derivative thereof, and either (d
1
) a hydroxylated hydrocarbon compound (phenol, etc.) represented by a specific formula or (d
2
) a mercapto-containing hydrocarbon compound (thiophenol, etc.) represented by a specific formula. With a catalyst obtained from this solid catalyst component, an olefin polymer can be obtained in extremely high yield. In particular, a propylene polymer which retains high stereoregularity can be obtained in extremely high yield
一种用于烯烃聚合的固体催化剂组分,其特征在于它是由(a)
镁化合物,(b)
四氯化钛,(c)
邻苯二甲酸二酯及其衍
生物,以及(d)
1
以特定公式表示的羟基烃化合物(
苯酚等),或 (d 1)
2
) 一种由特定公式表示的含巯基的烃化合物(
噻吩酚等)。使用由这种固体催化剂组分制成的催化剂,可以获得产量极高的烯烃聚合物。特别是可以获得一种立体规整度很高的
丙烯聚合物,产量极高