Okura Industrial Co., Ltd.

Sumitomo Chemical Company, Limited

Agency of Industrial Science and Technology

Okura Kogyo Kabushiki Kaisha

Kura Industrial Company, Limited

Kazuo Kondo

Teruo Tada

Nobuya Ishiguro

Toyoki Wano

Satoshi Maruyama

Kenji Tateishi

Takeshi Yamada

Haruo Hayashida

Teruaki Yoshida

Akihiro Ichige

Masashi Nishiyama

Kunio Kanaoka

Takamasa Kubo

Kazutoshi Yoshihara

Jun Hosokawa

Akihiko Ueda

Masaaki Zenigame

Tadatoshi Ogawa

Hideki Uehara

Hideyuki Yamashita

Tomohisa Tsuchida

A laminated film useful for packaging includes two outer layers and a core layer of a polypropylene resin interposed therebetween. Each of the outer layers includes (A) an ethylene-.alpha.-olefin copolymer having a density of less than 0.910 g/cm.sup.3 but not less than 0.870 g/cm.sup.3 and an ethylene content of at least 50 mol % and showing only one endothermic peak when analyzed by differential scanning calorimetry (DSC), (B) an ethylene-.alpha.-olefin copolymer having a density of 0.910-0.935 g/cm.sup.3 and an ethylene content of at least 50 mol %, and (C) an anti-fogging agent. The density of (B) is greater by at least 0.008 g/cm.sup.3 than that of (A).

Multilayer packaging film

A heat shrinkable multilayer film which includes two outer layers consisting essentially of a polyethylene resin, and one or more inner layers interposed between the outer layers, wherein at least one of the inner layers comprises a blend of a polypropylene resin and a substantially linear ethylene/alpha-olefin copolymer, wherein said copolymer has a molecular weight distribution Mw/Mn of not greater than about 2 and a melt flow ratio I.sub.10 /I.sub.2 of not smaller than 7.0.

Heat-shrinkable multi-layer polyolefin films

A wrapping multilayer film comprising at least 5 layers of (A) both the outermost layers each comprising an ethylene-.alpha.-olefin copolymer having an ethylene content of at least 50 mol %, (B) layers each comprising a propylene polymer and being disposed between the outermost layers (A), and (C) a layer comprising recycled resins and being disposed between the layers (B).

Wrapping multilayer film

A heat shrinkable laminate film is disclosed which includes a core layer formed of an ethylene-vinyl alcohol copolymer, two intermediate layers provided on opposite surfaces of the core layer and each formed of a copolymer selected from (a) copolymers of an unsaturated carboxylic acid or a derivative thereof and propylene and (b) copolymers of an unsaturated carboxylic acid or a derivative thereof and an alpha-olefin-propylene copolymer containing not greater than 10% by weight of alpha-olefin comonomer, and two outer layers provided on respective surfaces of the intermediate layers and each formed of an ethylene polymer.

Heat shrinkable laminate film

A biodegradable film or the like shaped article is formed from a composition including 100 parts by weight of cellulose fibers having a length of 3 mm or less and a diameter of 50 .mu.m or less, 10-600 parts by weight of a thermoplastic resin and 2-100 parts by weight of chitosan. A mixture containing (a) an aqueous solution of an acid salt of chitosan, (b) an aqueous dispersion or solution of a thermoplastic resin and (c) fine cellulose fibers is dried and shaped to obtain such a biodegradable shaped article.

Biodegradable composition and shaped article obtained therefrom

A seamless endless belt formed of a polyether-ether-ketone resin subjected to a specific simultaneous inflation-and-biaxially stretching treatment followed by an optional specific thermosetting/relaxation treatment as well as a process for manufacturing same is disclosed. This belt is manufactured by biaxially stretching a tube of a polyether-ether-ketone resin while inflating the tube at a temperature above the glass transition temperature of the resin but below the melting point of the resin, optionally and preferably thermosetting the stretched tube at 150.degree.-320.degree.C. while relaxing it at a rate of relaxation of 5-30% and then cutting the resultant tube in round slices. The stretched tube may be laminated with a tube of a thermoplastic polyurethane resin so as to form a laminate tube formed of a polyether-ether-ketone resin in the outer and inner tubes with, interposed therebetween, an intermediate tube of a thermoplastic polyurethane resin. A seamless endless tube is manufactured also from the laminate tube in such manner that the laminate tube is heated above the melting point of the polyurethane resin whereby the outer and inner tubes of the polyether-ether-ketone resin are thermoset while being relaxed and the intermediate tube of the polyurethane is melted and integrally bonded to the outer and inner tubes to form an integrally bonded laminate tube which is cut to form a seamless endless belt. The belt thus obtained is excellent in heat-resistance, dimensional stability at a high temperature and mechanical strength and can be used as a conveyer belt or the like especially in electronic apparatus where the belt moves smoothly without any elongation or contraction, even in severe service.

Seamless endless belt

A tubular multilayer film including at least two, biaxially stretched tubular layers each formed of a polypropylene resin, wherein the innermost layer contains spherical antiblocking agent particles having an average particle size of 0.2 to 5 .mu.m in an amount of 0.1 to 0.7% by weight, and the outermost layer is free of the spherical antiblocking agent particles is disclosed. The multilayer film may be prepared by biaxially stretching a multilayer tubular raw sheet having an innermost polypropylene layer containing spherical antiblocking agent particles and an outermost polypropylene layer free of such antiblocking agent particles.

Biaxially stretched multilayer film and process for manufacturing same

A heat-shrinkable polypropylene film adapted to be printed with, particularly, a flexographic ink is disclosed, which comprises a single layer heat-shrinkable film of a polypropylene resin composition containing spherical silicone resin fine particles of 0.2 to 5 microns in average particle size in a content of 0.1 to 0.7% by weight or a multi-layer heat-shrinkable film wherein at least one of the surface layers is such a polypropylene resin composition, with at least one surface of the single layer film or one surface of the surface layer of the multi-layer film having been subjected to corona discharge treatment to such degree that wettability index of the treated surface becomes 36 to 42 dyn/cm.

Heat-shrinkable polypropylene film with improved printability

A biodegradable sheet is produced from an aqueous dispersion containing finely cut cellulose fibers and chitosan. The dispersion is maintained at a temperature T.sub.1 .degree.C. which is within the following range:

Process of producing biodegradable sheet formed of cellulose and chitosan

A thermally shrinkable film with a liquid detecting function is prepared by coating or printing one side of the film with an ink which turns color or dissolves upon contact with a liquid. An item or object to be packaged is packaged in a thermally shrinkable film. The thermally shrinkable film and the package are useful for detecting a liquid leaking from the packed item or object, or entering into the package from the outside. This permits a visual inspection of the quality of the item or object packaged therein or of contamination by a foreign substance.

Thermally shrinkable film having a liquid detecting function and a

A heat shrinkable composite film comprises a core layer formed of (a) a straight chain, low density polyethylene having a density of 0.890-0.905 g/cm.sup.3 and a Vicat softening point of 60.degree.80.degree. C. and/or (b) a copolymer of propylene and one or more .alpha.-olefins with 2-8 carbon atoms having a Vicat softening point of 70.degree.110.degree. C., and two outer layers laminated over the opposite surfaces of the core layer and each formed of (c) a crystalline polypropylene resin having a melting point of 135.degree.150.degree. C., the core layer having a thickness of 30-80% of the total thickness of the outer layers and the core layer.

Heat shrinkable composite film and packaging method using same

A heat shrinkable composite film comprises a core layer formed of (a) a straight chain, low density polyethylene having a density of 0.890-0.905 g/cm.sup.3 and a Vicat softening point of 60.degree.-80.degree. C. and/or (b) a copolymer of propylene and one or more .alpha.-olefins with 2-8 carbon atoms having a Vicat softening point of 70.degree.-110.degree. C., and two outer layers laminated over the opposite surfaces of the core layer and each formed of (c) a crystalline polypropylene resin having a melting point of 135.degree.-150.degree. C., the core layer having a thickness of 30-80% of the total thickness of the outer layers and the core layer.

A composite film suitable for shrink-packaging bony cut meat, including at least one oxygen-impermeable layer, and at least one heat sealable, surface layer formed of a thermoplastic resin, said film having the following physical properties:

Chilled beef packaging film

The process for preparing a thermally shrinkable multilayer film composed of a polyamide resin layer as one surface layer and a sealant material layer as the other surface layer includes the step of causing the polyamide resin layer of the oriented laminate film to absorb water in the amount of 7.0% by weight or more before or during the thermal treatment. The laminate film is then dried so as to cause the polyamide resin layer to make the water content in the range form 2.5% by weight to 6.5% by weight while maintaining the oriented laminate film at temperatures of 90.degree. C. or lower after or during the thermal treatment. The thermally shrinkable multilayer film thus prepared is suitable for thermally shrinking packing foods such as roast meat or fresh cut meat.

Process for preparing a thermally shrinkable multilayer film

A heat-shrinkable, composite packaging film comprising (a) a core layer of saponified ethylene-vinyl acetate copolymer; (b) a first polymeric outer wall bonded to one side of the core layer; and (c) a second, heat-sealable polymeric outer wall bonded to the other side of the core layer; said first and second outer walls each having a permeability to hot water having a temperature of 90.degree. C. of less than 600 g/m.sup.2 /hour. The film is suitable for packaging meat and other food products subjected to sterilization and heat-shrinking process in a hot water bath.

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Marugame, Japan

Kazuo Kondo