Mitsubishi Gas Chemical Company, Inc.

Yoshiki Ito

Ryoji Otaki

Takashi Kashiba

Hideyuki Takahashi

Hidetoshi Hatakeyama

An oxygen-absorbing multi-layer laminate suitable for preserving food, etc. due to its excellent ability of retaining flavor and taste of food, a method of efficiently producing the oxygen-absorbing multi-layer laminate and a packaging container made of the oxygen-absorbing multi-layer laminate. The oxygen-absorbing agent is interspersed between a first thermoplastic resin layer and a second thermoplastic resin layer, or sandwiched between the integrally bonded first and second thermoplastic resin layers. In the oxygen-absorbing multi-layer laminate having at least three thermoplastic resin layers, the oxygen-absorbing agent is interspersed or interposed between the adjacent layers of at least one adjacent pair. With such a construction, the oxygen-absorbing ability is improved to prolong the storage life of retaining flavor and taste of food.

Oxygen-absorbing multi-layer laminate, production method thereof and packaging container

An oxygen absorbing multi-layer film which comprises a first outer surface comprising an uncolored oxygen permeating layer comprising an oxygen permeating polyolefin which does not contain a pigment; a colored concealing, oxygen permeating layer disposed under the uncolored oxygen permeating layer the color concealing, oxygen permeating layer comprising an oxygen permeating polyolefin and a pigment; a second outer surface disposed opposite to the first outer surface, the second outer surface comprising a gas barrier layer and an oxygen absorbing layer disposed between the colored concealing, oxygen permeating layer and the gas barrier layer the oxygen absorbing layer being made of an oxygen absorbing resin composition comprising an iron-containing deoxidizing agent and an oxygen permeating polyolefin. The oxygen absorbing multi-layer film can be used as a packaging material and has desirable strength, heat resistance, heat-sealing properties, hot tack properties and appearance. An oxygen absorbing packaging container can be made of the oxygen absorbing multi-layer film.

Oxygen absorbing multi-layer film and oxygen absorbing packaging container

An oxygen absorbing resin in which a deoxidizing composition is dispersed in a thermo-plastic resin mixture comprising (A) a thermoplastic elastomer and/or an ethylene propylene copolymer and (B) a thermo-plastic resin other than the above-mentioned (A), and having a flexural modulus of 600 MPa or less and an oxygen permeability of 130 cc.mm/m.sup.2.atm.day (23.degree. C., 50% RH) or more. The oxygen absorbing resin has an oxygen absorbing performance equal to that of a conventional deoxidizing agent in a small bag. A deoxidizing multi-layer structure which comprises a layer (I) comprising a thermoplastic resin layer having an oxygen permeability of 800 cc/m.sup.2.atm.day (23.degree. C., 50% RH) or more, a layer (II) comprising the oxygen absorbing resin, and a layer (III) having gas barrier properties. In addition, the deoxidizing multi-layer structure has a function of positively and efficiently absorbing oxygen.

Oxygen absorbing resin, deoxidizing multi-layer structure using resin,

A sheet-like or a film-like deoxidizing multi-layer material is herein disclosed which comprises an oxygen absorbing layer as a middle layer comprising an oxygen absorbing resin composition in which a deoxidizer composition is blended, a gas barrier layer as an outer layer comprising a gas barrier resin, and an oxygen permeating layer as an inner layer comprising an oxygen permeating resin, the gas barrier resin comprising a polyamide or a polyamide copolymer which contains 90 mol % or more of an amide structure unit produced by the polycondensation reaction of metaxylylenediamine with adipic acid.

Deoxidizing multi-layer material and packaging container using same

A multi-layer structural body for absorbing oxygen and preserving packaged goods adversely affected by oxygen, such as food, includes a first layer resistant to gas permeation; a second layer laminated on the first layer and having a deoxidizing property; and a third layer laminated on the second layer and permeable to air, wherein the first layer has an oxygen permeability of less than 100 cc/m.sup.2 .multidot.day.multidot.atm (23.degree. C., 100% RH); the second layer includes a resin having an oxygen permeability coefficient of at least 200 cc.multidot.0.1 mm/m.sup.2 .multidot.day.multidot.atm (23.degree. C., 100% RH), a granular oxygen absorber composition dispersed in the resin and including a deoxidation material undergoing a deoxidation reaction when exposed to moisture, and a moisture absorber dispersed in the resin, wherein the third layer has an oxygen permeability of at least 100 cc/m.sup.2 .multidot.day.multidot.atm (23.degree. C., 100% RH)

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Kanagawa-ken, Japan

Yoshiki Ito