Mitsui Petrochemical Industries, Ltd.

Chugoku Resin Co., Ltd.

Shinichi Imuta

Tatsuo Kato

Yasushi Nagase

Masami Kobayashi

The improved resin composition that comprises (A) 99-40 parts by weight of a 4-methyl-1-pentene based polymer, (B) 0-30 parts by weight of a butene based liquid polymer having a kinematic viscosity of 2-5000 cSt at 100.degree. C. and (C) 1-30 parts by weight of a butene-1 based solid polymer, with the sum of (A)+(B)+(C) being 100 parts by weight. The resin composition is excellent in heat resistance, flexibility, and impact resistance.

Resin composition

The improved heat-resistant overwrap film is formed from a resin composition that comprises (A) 98-70 parts by weight of a 4-methyl-1-pentene based polymer, (B) 1-15 parts by weight of an isobutylene based polymer having a kinematic viscosity of 2-5000 cSt at 100.degree. C., and (C) 1-15 parts by weight of a butene-1 based solid polymer, with the sum of (A)+(B)+(C) being 100 parts by weight. The film is excellent in heat resistance, flexibility, tackiness and transparency.

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Kuga, Japan

Shinichi Imuta