Polypropylene block copolymer and the film thereof

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 297/00 (2006.01) C08F 297/08 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2105834

ABSTRACT OF THE DISCLOSURE A polypropylene block copolymer comprising a melt- kneaded block copolymer obtained, using a Ziegler-Natta catalyst, by polymerizing monomer comprising propylene to form a polymer comprising polypropylene (component A) in an amount of from 60 to 80% by weight to the total polymer amount in substantially the absence of an inert solvent in a 1st step and then polymerizing a mixture of ethylene and propylene having an ethylene content of from 20 to 50% by weight in a vapor phase to form an ethylene propylene copolymer (component B) in amount of from 20 to 40% by weight to the total polymer amount in a vapor phase in a 2nd step, said block copolymer being such that the intrinsic viscosity of the component B ([?]B) is at least 2.0 dl/g and the ratio ([?]B/[?]A) of the intrinsic viscosity of the component B ([?]B) to the intrinsic viscosity of the component A ([?]A) is 1.8 or less. - 31 -

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