Idemitsu Petrochemical Co., Ltd.

Masamichi Kondo

Satoshi Tamura

Toshio Kano

Yutaka Azuma

Tsunenosuke Hiramatsu

Keigo Umemoto

A polypropylene resin composition is herein disclosed which is obtainable by blending (A) 100 parts by weight of a polypropylene resin comprising (a) 100 to 20% by weight of a homopolymer of propylene and/or a propylene copolymer containing 4% by weight or less of another olefin unit in which in a pentad fraction by .sup.13 C-NMR, [rrrr/(1-mmmm)].times.100 is in the range of 20 to 60%, a Tm measured by a DSC is 150.degree. C. or more, and a melt enthalpy is 100 J/g or less, and (b) 0 to 80% by weight of a propylene copolymer containing 10 to 80% by weight of an olefin unit other than propylene, with (B.) 0.01 to 5 parts by weight of an octyltin salt of a fatty acid, an alkylenebisfatty acid amide, a fatty acid ester of a polyvalent alcohol, or a metal salt of an aliphatic monocarboxylic acid. The employment of this polypropylene resin composition permits, under a good moldability by the calender molding machine, the manufacture of films and sheets having less thickness unevenness, excellent appearance and heat resistance and such flexibility as in molded articles of a plastic polyvinyl chloride.

Polypropylene resin composition

A polypropylene resin composition is herein disclosed which is obtainable by blending (A) 100 parts by weight of a polypropylene resin comprising (a) 100 to 20% by weight of a homopolymer of propylene and/or a propylene copolymer containing 4% by weight or less of another olefin unit in which in a pentad fraction by .sup.13 C-NMR, �rrrr/(1-mmmm)!.times.100 is in the range of 20 to 60%, a Tm measured by a DSC is 150.degree. C. or more, and a melt enthalpy is 100 J/g or less, and (b) 0 to 80% by weight of a propylene copolymer containing 10 to 80% by weight of an olefin unit other than propylene, with (B) 0.01 to 5 parts by weight of an octyltin salt of a fatty acid, an alkylenebisfatty acid amide, a fatty acid ester of a polyvalent alcohol, or a metal salt of an aliphatic monocarboxylic acid. The employment of this polypropylene resin composition permits, under a good moldability by the calender molding machine, the manufacture of films and sheets having less thickness unevenness, excellent appearance and heat resistance and such flexibility as in molded articles of a plastic polyvinyl chloride.

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Ageo, Japan

Masamichi Kondo