Nippon Petrochemicals Company, Limited

Nippon Oil Company

Masataka Oka

Masato Kimura

Kazuo Matsuura

Akira Sano

Shinji Kojima

Tetsujirou Kuroishi

Tomonori Takahashi

Isamu Ogasawara

Hideaki Yamada

Masami Furukawa

Kohta Saito

Takeo Amatsu

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

A disposable tray for medical use comprising at least two layers formed of thermoplastic resin. A first surface layer thereof is peeled to expose a sterile surface, and after use the tray can be disposed of by being folded into two. In use, liquid medicines are contained in recessed portions made in the tray, and medical instruments are placed to rest thereon. Filthy matters are placed in a large recessed portion of the tray.

Disposable tray for medical use and method of making the same

A molding composition is disclosed which comprises ultrahigh molecular weight polyethylene having an intrinsic viscosity of 10-30 dl/g at 135.degree. C. in decalin. Improved injection moldability is provided by the use of such polyethylene obtainable by a multi-stage polymerization reaction including at least the following two stages: (a) a first stage in which ethylene is polymerized using a specified composite catalyst in the absence of hydrogen of its presence at lower concentration to produce 50-99.5 weight parts of polyethylene having an intrinsic viscosity of 12-32 dl/g at 135.degree. C. in decalin; and (b) a second stage in which a fresh feed of ethylene is polymerized in the presence of hydrogen at higher concentration to produce 50-0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1-5 dl/g at 135.degree. C. in decalin.

Molding composition

This invention provides inorganic filler-containing polyolefine compositions with use of inorganic fillers together with novel coupling agents which are inexpensive and convenient to use.

Polyolefine compositions comprising (a) mica and (b) a ethylene-acrylic

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Fujisawa, Japan

Masataka Oka