Sumitomo Chemical Company, Limited

Jiro Sakai

Kazuki Wakamatsu

Tomohisa Fukao

Masahiro Kakugo

Kizuku Wakatsuki

Hajime Sadatoshi

Hideo Nomura

Shigeo Tanaka

Toshiro Kojima

Kazuhiro Chikaishi

Crystalline polypropylene excellent in rigidity, heat resistance and surface hardness is disclosed, having a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw/Mn) of 10 or more, an intrinsic viscosity [.eta.] of from 0.8 to 5.0 dl/g as measured in tetralin at 135.degree. C., a cold xylene-soluble content (CXS) of not more than 4% by weight, a density (d) of 0.910 g/cm.sup.3 or more as measured at 23.degree. C., and a long period (L) (.ANG.) as measured at 25.degree. C. by a small-angle X-ray scattering method satisfying relationship:

Crystalline polypropylene and crystalline polypropylene composition

There is disclosed resin composition comprising 1 to 99% by weight of a polymer A and 1 to 99% by weight of a polymer B, the polymer A and B having refractive indexes which permit satisfaction of the relation:

Resin composition

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Chiba, Japan

Jiro Sakai