Mitsubishi Petrochemical Company Limited

Hajime Mizuno

Toshihiko Sugano

Takashi Fujita

Hideshi Uchino

Hideo Sakurai

Hiroshi Omori

Kazuhiro Fujiwara

Yoshiharu Yamamoto

Kenji Yamamoto

There is provided a biaxially-oriented multi-layer film comprising:

Biaxially-oriented multi-layer films

A propylene copolymer composition enabling the production of a film having excellent low-temperature heat sealing ability and blocking resistance, is obtained by blending 1 to 70 wt % of a component A and 30 to 99 wt % of a component B. The component A comprises either a propylene homopolymer or a copolymer of propylene with not more than 10 mol % of ethylene or an a-olefin having a carbon number of 4 to 20, and has a molecular weight distribution (Mw/Mn) of not more than 3, a mean elution temperature of 40.degree. to 100.degree. C., and an elution dispersion degree (.sigma. value) of not more than 10. The component B comprises a copolymer of propylene with ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20, and has a molecular weight distribution (Mw/Mn) of 3.5 to 10.

Propylene copolymer composition

A highly crystalline polypropylene for forming film which is obtained by subjecting to the molecular weight degradation a propylene homopolymer obtained by the polymerization of propylene over a stereoregulating catalyst and which has:

Highly crystalline polypropylene for forming film

A propylene polymer film composed of a composition comprising 100 parts by weight of a crystalline propylene polymer and 0.01 to 3 parts by weight of a non-meltable crosslinked silicone resin powder having a mean particle diameter of 0.5 to 7 microns. The film is especially suitable for packaging applications because of its good transparency, antiblocking property, bag openability, slipperiness, appearance and heat-sealability.

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Yokkaichi, Japan

Hajime Mizuno