Solid catalyst components for polymerization of alpha -olefins

摘要

A solid catalyst component for forming, in combination with an organoaluminium compound, a catalyst for polymerization of alpha -olefins is provided, whereby alpha -olefin polymers having high stereoregularity or stereospecificity are produced in a high yield. The catalyst component is a product of contact of materials consisting essentially of a halogen-containing magnesium compound, a nucleus-substituted or unsubstituted benzoate ester and a titanium compound, and satisfies the conditions that the solid catalyst component contains 0.5 to 3.5% by weight of titanium atoms, and the highest absorption peak in the infrared absorption spectrum of the catalyst component among the absorption peaks appearing in the wave-number range of 1560 cm-1 to 1710 cm-1 appears in the wave-number region of 1665 cm-1 to 1710 cm-1.