Process for polymerization of alpha-olefin.

摘要

There is provided a process for polymerization of an alpha -olefin which comprises polymerizing an alpha -olefin in the presence of a catalyst which is a combination of a solid component (A), which is obtained by subjecting a composition (A0) comprising as the essential ingredients titanium, magnesium and a halogen to preliminary polymerization of the alpha -olefin conducted in the presence of said composition in a slurry and an organoaluminum compound, and an organoaluminum compound (B), said preliminary polymerization being conducted in two steps: the first step wherein the concentration of said composition (A0) in the slurry is adjusted to l0-l00 g/lit.-solvent and polymerization of the alpha -olefin is conducted at 30 DEG C or lower so that the amount of a polymer produced is 0.00l to l g per gram of said composition and the second step wherein polymerization of the alpha -olefin is conducted at 60 DEG C or higher under the same condition of the concentration of said composition as in the first step so that the amount of a polymer produced is l to l0 g per gram of said composition. According to this process, an alpha -olefin is polymerized at a possible elevated temperature and an alpha -olefin polymer having high stereoregularity, excellent polymer properties and improved odor is produced in a high yield.