Process for producing modified polypropylene

Details Process for producing modified polypropylene Process for producing modified polypropylene

C - Chemistry, Metallurgy

08

F

400/2058, 402/60

C08F 297/00 (2006.01) C08F 297/08 (2006.01)

Patent

CA 1043493

PROCESS FOR PRODUCING MODIFIED POLYPROPYLENE ABSTRACT OF THE DISCLOSURE Heteroblock copolymers of propylene and ethylene containing a relatively small quantity of an isotactic polypropylene segment, a copolymer segment of very low ethylene (polymerized) content, and another copolymer segment of high ethylene (polymerized) content, in which the quantities of the three types of segments are specific, and in which the isotactic polypropylene content is specific, which heteroblock copolymers are produced by three types of successive steps of polymerization with the monomer feeds in specific ratios of ethylene/propylene, the ratio being zero for the first step. The modified polypropylenes of this invention have desirable characteristics such as excellent surface lustre and high bending rigidity, which are inherent characteristics of isotactic polypropylenes and having, moreover, excellent resistance to impact.

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