Process for the preparation of a polypropylene

Details Process for the preparation of a polypropylene Process for the preparation of a polypropylene

1989-06-07

1992-03-31

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502125, 526351, C08F 4654, C08F 4651, C08F 1006

Patent

active

051009811

ABSTRACT:
In the process according to the invention for the preparation of a polypropylene, a catalyst system is used which is based on the product of the reaction of a magnesium halide with an electron donor and a tetravalent titanium compound, a halogen-free organoaluminum compound and two different organosilicon compounds as stereo-regulator. Propylene homopolymers and copolymers having a very narrow molecular weight distribution and high isotacticity are obtained in high yields. The polymers are suitable, in particular, for injection molding.

REFERENCES:
patent: 4472524 (1984-09-01), Albizzati
patent: 4529716 (1985-07-01), Banzi et al.
patent: 4841003 (1989-06-01), Kashiwa et al.
patent: 4843132 (1989-06-01), Werner et al.

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