Process for polymerization of .alpha.-olefin

Details Process for polymerization of .alpha.-olefin Process for polymerization of .alpha.-olefin

1989-07-17

1991-01-15

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502108, 526119, 526124, 526127, 526128, 526142, 526904, C08F 4654, C08F 1006

Patent

active

049855158

ABSTRACT:
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 (A.sub.O) comprising as the essential ingredients titanium, magnesium and a halogen to preliminary polymerizatoin 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 (A.sub.O) in the slurry is adjusted to 10-100 g/lit.-solvent and polymerization of the .alpha.-olefin is conducted at 30.degree. C. or lower so that the amount of a polymer produced is 0.001 to 1 g per gram of said composition and the second step wherein polymerization of the .alpha.-olefin is conducted at 60.degree. 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 1 to 10 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.

REFERENCES:
patent: 4276400 (1981-06-01), Bissell
patent: 4387198 (1938-06-01), Sato et al.
Patent Abstracts of Japan, vol. 6, No. 257 (C-140) [1135], Dec. 18th, 1982; & JP-A-57 151 602 (Mitsui Toatsu Kagaku K.K.), 18-09-1982.
Patent Abstracts of Japan, vol. 7, No. 225 (C-189) [1370], Oct. 6th, 1983; & JP-A-58 120 610 (Mitsui Toatsu Kagaku K.K.), 18-07-1983.

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