Sumitomo Chemical Company, Limited

Toshiro Kojima

Kazuki Wakamatsu

Masahiro Kakugo

Hajime Sadatoshi

Hideo Nomura

Tomohisa Fukao

Jiro Sakai

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

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Ibaraki, Japan

Toshiro Kojima