Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1998-01-15
2000-09-12
Copenheaver, Blaine
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
156229, 156299, 156300, 4283179, 4283197, 4283199, 428910, B32B 518, B32B 3100
Patent
active
061175382
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an oxygen-absorbing multilayered body for absorbing oxygen and a manufacturing method thereof. More particularly, this oxygen-absorbing multilayered body is formed in a film or sheet shape which is preferable as a packaging material. The oxygen-absorbing multilayered body generally has a multilayered construction and is provided with water and oil resistance. This film-shaped or sheet-shaped oxygen-absorbing multilayered body is used as a container or package to preserve various kinds of products such as food, medicines and metal products which tend to easily deteriorate due to an influence of oxygen in order to prevent such products from oxidizing.
BACKGROUND ART
In order to prevent various kinds of products such as food, medicines and metal products, which tend to easily deteriorate due to an influence of oxygen, from oxidizing, oxygen absorbers which remove oxygen from a packaging container or packaging bag have been used. The form of the oxygen absorber which was developed at an earlier stage and is still generally used is a sachet which is filled with a granular or powdery oxygen-absorbing component.
As an oxygen absorbent which can be handled easily, can be widely applied and will not cause problems such as eating it by mistakes, a film- or sheet-shaped (hereinafter sometimes simply referred to as "film") oxygen absorbent exists. This film-shaped oxygen absorbent is used on a packaging container or packaging bag itself. In this case, it is possible to give oxygen-absorbing performance to the packaging container or packaging bag itself.
In order to obtain a film-shaped oxygen absorbent, a technique exists to prepare a resin composition by using a thermoplastic resin as a matrix component and by fixing a granular or powdery oxygen-absorbing component in the matrix component, and to make the resin composition in a multilayered form with other resin layers.
However, the use of this oxygen-absorbing multilayered body sometimes causes the oxygen-absorbing component to contaminate the content of a container when the oxygen-absorbing layer directly contacts a packaged substance such as food, particularly when the content is liquid.
Therefore, as shown in the Japanese Patent (Kokoku) Publication No. SHO 62-1824 and the Japanese Patent (Kokoku) Publication No. SHO 63-2648, a multilayered construction has been devised, in which both sides of the oxygen-absorbing layer are covered with resin layers. For example, the absorbing surface, which is located on the packaged substance side of the oxygen-absorbing layer, is shielded with an air-permeable material and a gas-permeation-resistant layer is placed on the other side of the oxygen-absorbing layer.
If a porous air-permeable material is used for the shielding layer on the absorbing surface of the oxygen-absorbing layer, the oxygen-absorbing component leaks out toward the packaged substance which contains a large amount of moisture. Therefore, it is desirable that the shielding layer is made of a resin layer having no fear of such leakage.
A known oxygen absorber is used as the oxygen-absorbing component to be mixed in the oxygen-absorbing layer. Particularly, iron powder which is superior in the oxygen-absorbing performance is often utilized as a main element for the oxygen-absorbing reaction.
However, the oxygen absorption speed of the conventional oxygen absorbent has remained extremely low. This is because the oxygen permeability of a polyolefine-group resin used as a resin in which the oxygen-absorbing component is mixed is comparatively low, and because the oxygen permeability of the resin shielding layer which covers the absorbing surface of the oxygen-absorbing layer is also low. In other words, the oxygen-absorbing component of the oxygen-absorbing layer is blocked by the resin of the matrix component of the oxygen-absorbing layer and the resin of the shielding layer.
In order to improve the oxygen absorption speed of the oxygen-absorbing layer, as shown in the Japanese Patent Laid-Open (Kokai) Publicat
REFERENCES:
patent: 5116660 (1992-05-01), Komatsu et al.
patent: 5143763 (1992-09-01), Yamada et al.
Hasegawa Hiroshi
Hirata Masukazu
Mabuchi Yoshinori
Nisizawa Chihara
Takahashi Hideyuki
Cole Thomas W.
Copenheaver Blaine
Mitsubishi Gas Chemical Company Inc.
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