Nippon Petrochemicals Company, Limited

Tomonori Takahashi

Masato Kimura

Takashi Ishida

Masataka Oka

Isamu Ogasawara

A multilayered packaging material having good piercing resistance and tearability and being excellent in appearance, transparency and so forth, can be produced by orienting multilayered structure which is composed of a polyamide resin layer and other thermoplastic resin layer(s) at a monoaxially stretching ratio of 1.5- to 7.0-fold in such a manner that the thickness of the polyamide resin layer is 3 to 30 .mu.m and the thickness(es) of the other thermoplastic resin layer(s) is (are) at least twice as much as that of the polyamide resin layer.

Monoaxially oriented multilayered packaging material

In one aspect of the invention, there is provided a molded article of crystalline thermoplastic resin with high gas barrier property of which the resin has crystalline and non-crystalline regions, the enhancing effect on gas barrier property of uniaxial-uniplanar orientation of the crystal axis direction of crystallites of said crystalline regions being used and the crystallites orientation being optimized by specific conditions. In another aspect of the invention, the molded article of the first aspect of the invention is further annealed to increase the crystallinity of the crystalline regions. The molded articles in accordance with the present invention have excellent gas barrier properties, and they are not only useful as chilled beef packaging materials, but also useful for retort food packaging, pouch packaging, coating and protecting materials for ham and sausages, processed fish, processed seafood products such as boiled fish paste, dried food for sprinkling, soup powder, parched rice cake, curry powder, spices, vegetables, fruits and pharmaceuticals.

Growing community of inventors

Chigasaki, Japan

Tomonori Takahashi