Showa Denko K.k.

Shimako Matsumoto

Kazuyuki Watanabe

Hisayoshi Yanagihara

A propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising an outer layer comprising (b) propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (c) crystalline polyethylene dispersed therein a plurality of particles comprising an outer layer comprising (b') propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (a') polypropylene, a propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising (b) propylene-.alpha.-olefin copolymer rubber having therein at least one particle comprising (a') polypropylene and at least one particle comprising (c) crystalline polyethylene. Propylene block copolymer resin compositions comprising the propylene block copolymers, and processes for producing a propylene block copolymers.

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Oita, Japan

Shimako Matsumoto