Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1995-09-22
1998-06-16
Le, H. Thi
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428325, 428328, 428331, 428410, 428913, B32B 516
Patent
active
057667519
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of International application PCT/JP/00073, filed Jan. 24, 1995.
TECHNICAL FIELD
The present invention relates to a laminate or laminate film which comprises at least one layer (or at least a portion) comprising a resin composition having an excellent gas barrier property, and a shaped (or molded) article comprising a portion of such a resin composition.
BACKGROUND ART
A film having a gas barrier property (gas barrier film) as a kind of functional film has widely been put to practical use in the fields of food, medicine, agricultural chemicals, cosmetics, etc., wherein contents are stored or protected while the "quality" of the contents is liable to cause a problem. One of such important usage includes a field of "packaging".
Packaging, i.e., making or putting an object into a package or wrap, or the material therefor is desired to have a wide variety of functions. For example, such functions of packaging may include: mechanical protective property, safety, sanitary property, workability, adaptability to goods (transparency, printability, heat sealing property), utility, profitability, etc. Among these functions, various "gas barrier property", as one of the factors in the above-mentioned storability or protective property, is an important property for affecting the storability of the above contents such as food. Along with recent diversification in the form of goods distribution or in packaging technique, intensification of additive control, change in taste, etc., the importance of the gas barrier property has been increased more and more. On the other hand, the gas barrier property has heretofore been a serious weak point of ordinary plastic materials.
Factors which can deteriorate a food include oxygen, light, heat and/or moisture. Among these factors, oxygen has been considered to be a substance causing such deterioration. A material having a gas barrier property (gas barrier material) is a material which has a main function of effectively intercepting oxygen. Such a gas barrier material exhibits the function of intercepting oxygen, and simultaneously exhibits a function which is essential for various measures for controlling the deterioration of food (such as gas charging and vacuum packaging). The gas barrier material has been utilized very effectively in many fields such as food packaging inclusive of confectionery bags, bags for dried bonito, pouches for retorted foods, containers for carbonated drinks, etc., or packaging for cosmetics, agricultural chemicals, and medical use, on the basis of its barrier function to various species of gases such as oxygen, organic solvent vapors, aromas; or its function of preventing corrosion, odor, sublimation, etc., based on the barrier function thereof.
Among films comprising a thermoplastic resin, those films comprising oriented polypropylene, polyester, polyamide, etc., particularly have excellent mechanical property, heat resistance, transparency, etc., and therefore these films are widely used as a packaging material. However, in a case where a film comprising such a material is used for food packaging, since the barrier property thereof to a gas such as oxygen is insufficient, the food as the contents in the package is liable to be deteriorated due to degradation based on oxidation, or the function of aerobic bacteria, etc. Furthermore, in such a case, an aroma component of the food permeates the package to be diffused to the outside of the package. As a result, there tends to occur various problems such that the flavor of the food is lost, or the content is wetted with outside moisture due to the penetration of such moisture and the taste thereof becomes worse. Accordingly, when a film of the above-mentioned material such as polypropylene is used for food packaging, it is usual to adopt a method wherein another film (or layer) having an excellent gas barrier property is laminated onto the film of the above-mentioned material.
As a method of imparting a gas barrier property or increasing the gas barrier property of a re
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Kawakita Toshio
Kotani Kozo
Kuroda Toshiya
Sakaya Taiichi
Le H. Thi
Sumitomo Chemical Company Ltd.
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