Sumitomo Chemical Company, Limited

Yu Higuchi

Takeshi Maruyama

Masahiro Yanagisawa

A propylene polymer composition comprising a propylene polymer and an ethylene-&#x3b1;-olefin copolymer (provided that the ethylene-&#x3b1;-olefin copolymer is not the propylene polymer), the propylene polymer composition satisfying requirement (I): One embodiment of the present invention is a propylene polymer composition which additionally satisfies the requirement (II). Requirement (II): The ethylene triad chains (EEE) in an ortho-dichlorobenzene-insoluble fraction are 2.0 mol % or more.

Propylene polymer composition

A propylene-based polymer composition having good thermal stability and yielding a molded product have a favorable appearance is provided. The composition contains a propylene-based polymer (A) selected from a propylene homopolymer (A-1) and a heterophasic propylene-based polymer (A-2), carbon black (D), and optionally ethylene-&#x3b1;-olefin copolymer (B). The content of (D) is 0.001 to 1.7 parts by weight with respect to 100 parts by weight of (A). The primary particle size of the carbon black is 15 nm to 39 nm, and x defined by the following formula (1) is 1 to 430.&#x2003;&#x2003;(1)In formula (1), a is the concentration (unit: atom %) of oxygen double-bonded to carbon on the surface of the carbon black, and S is the nitrogen adsorption specific surface area (unit: m/g) of the carbon black.

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Ichihara, Japan

Yu Higuchi