Polymerization catalyst composition

Details Polymerization catalyst composition Polymerization catalyst composition

1976-03-30

1981-02-24

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252429B, 526139, 526153, 526351, C08F 466, C08F 1006

Patent

active

042529301

ABSTRACT:
Titanium trichloride for use as a component of a Ziegler polymerization catalyst is modified in order to enhance the activity and/or stereospecificity of the catalyst in the polymerization of olefins, especially propylene, by heating the titanium trichloride with phosphorus oxytrichloride in an aromatic hydrocarbon diluent for several hours in the absence of the organo aluminium component of the catalyst. Ball milling, or shearing, during the modification reaction is not required. The use of aromatic hydrocarbon gives unexpected improvement compared with any other hydrocarbon diluent and the modification reaction gives improved results compared with addition of the titanium trichloride, phosphorus oxytrichloride and the organo aluminium component to the reactor at the beginning of a batch polymerization.

REFERENCES:
patent: 3534006 (1970-10-01), Kamaishi et al.
patent: 3825524 (1974-07-01), Wada et al.
patent: 3850899 (1974-11-01), Wada et al.

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