Polypropylenic compositions having improved impact strength...

Details Polypropylenic compositions having improved impact strength... Polypropylenic compositions having improved impact strength...

C - Chemistry, Metallurgy

08

L

400/4919

C08L 23/14 (2006.01) C08F 297/08 (2006.01) C08L 23/12 (2006.01) C08L 23/16 (2006.01)

Patent

CA 1196140

POLYPROPYLENE COMPOSITIONS HAVING IMPROVED IMPACT STRENGTH PROPERTIES AT LOW TEMPERATURES AND PROCESS FOR PREPARING SAME ABSTRACT OF THE DISCLOSURE Polypropylene compositions having high impact strength at low temperatures comprising as essential components: - 100 parts by weight of polypropylene having an isotacticity index > 90, - 8-25 parts by weight of an amorphous copolymeric fraction (1) of ethylene-propylene soluble in xylene at 23°C, contain- ing 20-80% by weight of ethylene, - 2-10 parts by weight of an ethylene-propylene crystalline co- polymeric fraction (2) having a crystallinity of the poly- ethylene type containing 50-90% by weight of ethylene; and in which the weight ratio between the total polymerized ethylene and fraction (1) is <1. The compositions are prepared by polymerization processes comprising at least a step of homopolymerization of propylene to stereoregular polymer and a subsequent step of polymerization - 19 - of ethylene-propylene mixtures in the presence of catalysts com- prising a titanium compound carried on a magnesium halide in ac tive form. -20-

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