Process for preparing polypropylene compositions having high...

Details Process for preparing polypropylene compositions having high... Process for preparing polypropylene compositions having high...

C - Chemistry, Metallurgy

08

F

400/6583

C08F 2/14 (2006.01) C08F 297/08 (2006.01) C08L 23/16 (2006.01) C08L 51/06 (2006.01)

Patent

CA 1050192

ABSTRACT OF THE DISCLOSURE There is disclosed a new and improved process for preparing compositions consisting for at least 50% by weight of isotactic polypropylene and having high impact strength at low temperatures. A specific improvement of the process consists in avoiding difficulties caused by the formation of considerable amounts of rubbery polymer in the polymerization product. The process comprises two steps. In step (1) propylene is polymerized in an inert liquid hydrocarbon medium and in contact with a stereospecific catalyst prepared by mixing a titanium trihalide with a dialkyl aluminum monohalide to obtain a slurry. In step (2) ethylene, or an ethylene/propylene mixture, is fed to the polymerization slurry of step (1) and the poly- merization is continued until the amount of ethylene polymerized is, at most, 20% by weight of the total, final polymeric composition obtained.

239318

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