Mitsubishi Gas Chemical Company, Inc.

Yoshihiko Harima

Yoshiaki Inoue

Takeshi Nagasaka

Yoshio Yoshikawa

Isamu Yoshino

Shigeru Murabayashi

Toshio Komatsu

Syuji Wakamatsu

Tomoo Kamiya

A-Hon Kwon

Hisaya Araki

A gas concentration adjusting agent which allows a low oxygen concentration environment, such as an ischemic environment for tests of cultured cell damage caused by low oxygen or the like, to be conveniently created, as well as a method and a system for adjusting gas concentrations using this easily handled agent, are provided. During the culture of cultured cells under low oxygen-ischemic culture conditions in a sealed container, the gas concentration adjusting agent consisting of water, a carbon dioxide absorbent, and an ascorbic acid-based, carbon dioxide-generating type of oxygen-absorbing composition is sealed inside the sealed container, so as to adjust the oxygen concentration in the culture environment to no more than 1% and the carbon dioxide concentration to between 3 and 7%.

Gas concentration adjusting agent, gas concentration adjusting method,

Disclosed are an inhibitor parcel comprising (a) a composition comprising an unsaturated fatty acid compound as its main ingredient and (b) a permeable diffusing-parcelling material prepared by laminating and bonding an oxygen-permeable resin layer onto one side of a base sheet made of a fibrous material and an adhesive or onto one adhesive-coating side of a base sheet made of a fibrous material, then laminating and bonding thereonto an oxygen-permeable resin layer and laminating and bonding a porous film of low softening point resin or a low softening point unwoven fabric onto the other side of the base sheet, said permeable diffusing-parcelling material (b) having an oxygen permeability of 10.sup.4 to 10.sup.6 ml/m.sup.2.Atm.Day and a (water vapor permeability/oxygen permeability) ratio of 0.02 H.sub.2 O mg.Atm/O.sub.2 ml! or above at 25.degree. C. at a relative humidity of 50% and said composition (a) being parcelled by said permeable diffusing-parcelling material (b) and an inhibitor parcel for use in electronic devices and electronic parts which comprises said inhibitor parcel and a method for preserving electronic devices and electronic parts using said inhibitor parcel.

Inhibitor parcel and method for preserving electronic devices or

Disclosed are an inhibitor parcel including (a) a composition including an unsaturated fatty acid compound as its main ingredient and (b) a permeable diffusing-parcelling material prepared by laminating and bonding an oxygen-permeable resin layer onto one side of a base sheet made of a fibrous material and an adhesive or onto one adhesive-coating side of a base sheet made of a fibrous material, then laminating and bonding thereonto an oxygen-permeable resin layer and laminating and bonding a porous film of low softening point resin or a low softening point nonwoven fabric onto the other side of the base sheet, the permeable diffusing-parcelling material (b) having an oxygen permeability of 10.sup.4 to 10.sup.6 ml/m.sup.2. Atm. Day and a (water vapor permeability/oxygen permeability) ratio of 0.02 [H.sub.2 O mg.Atm/O.sub.2 ml] or above at 25.degree. C. at a relative humidity of 50% and the composition (a) being parcelled by the permeable diffusing-parcelling material (b) and an inhibitor parcel for use in electronic devices and electronic parts which includes the inhibitor parcel and a method for preserving electronic devices and electronic parts using the inhibitor parcel.

In an oxygen absorbent packet, an oxygen absorbent containing moisture is received in the cup like plastic container and an air-permeable layer made of paper is adhered to the opening section of the container. A substantially air-impermeable layer is formed on the outer surface of the air-permeable layer, whereby the oxygen absorbent absorbs oxygen through the peripheral side edge of the air-permeable layer.

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Tokyo, Japan

Yoshihiko Harima