Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1995-09-22
2000-11-14
Thibodeau, Paul
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428324, 428480, 428483, 428522, 428532, 428 354, 428 367, B32B 516
Patent
active
061467502
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a resin composition having excellent biodegradability and excellent gas barrier properties, and a film or a shaped (or molded) article comprising such a resin composition.
2. Background Art
A film having a gas barrier property (gas barrier film) is a kind of functional film that has been widely used in the fields of food, medicine, agricultural chemicals, cosmetics, etc., wherein contents to be contained therein are stored or protected while the "quality" of the contents is liable to cause a problem. One of such important use of the film includes the field of "packaging".
Packaging includes making or putting an object into a package or wrap. The material for the packaging is desired to have a wide variety of functions. For example, packaging may serve various functions including providing mechanical protection, safety, sanitary protection, workability, adaptability to goods (transparency, printability, heat sealing property), utility, profitability, etc. Having a "gas barrier property" against various gases is important as it affects the storability of the packaged contents such as food. Along with recent diversification in the form of goods distribution, in packaging techniques, and an intensification of additive control, change in taste, etc., the gas barrier property has become increasingly more important. 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 kinds of gases such as oxygen, organic solvent vapors, aromas; or on the basis of its function of preventing corrosion, odor, sublimation, etc., based on the barrier function thereof.
Among films comprised of a thermoplastic resin, those films comprising oriented polypropylene, polyester, polyamide, etc., particularly have excellent mechanical, heat resistance, and transparency properties, etc., and therefore these films are widely used as a packaging material. However, the barrier property against oxygen permeability is insufficient as these films have large gas permeability. Therefore, in a case where a film comprised of such a material is used for food packaging, the food in the package is liable to be deteriorated due to degradation based on oxidation, or the function of aerobic bacteria, etc. 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 oxygen barrier property is laminated onto the film of the above-mentioned material.
The following two methods are representative measures for forming such a film having a good barrier property to oxygen. One method involves using a metal foil lamination such as aluminum foil lamination. The other method involves vapor-depositing a metal onto a surface of a thermoplastic resin film. In these methods, the excellent gas barrier property (particularly, a gas barrier permeability to oxygen) of the resultant metal foil has been effectively utilized.
On the other hand, as a transparent plastic raw material having a small oxygen permeability, there have hereto
REFERENCES:
patent: 4425410 (1984-01-01), Farrell et al.
patent: 4818782 (1989-04-01), Bissot
patent: 4983432 (1991-01-01), Bissot
patent: 5049609 (1991-09-01), Patitsas
patent: 5153061 (1992-10-01), Cavagna
patent: 5206087 (1993-04-01), Tokiwa et al.
patent: 5244729 (1993-09-01), Harrison
patent: 5296282 (1994-03-01), Evers
patent: 5300358 (1994-04-01), Evers
Encyclopdeia of Polymer Science and Engineering, vol. 17., pp 167-197, 1985.
Chemical Abstracts, vol. 101, No. 20, (Nov. 1994), Abstract No. 174111.
Chemical Abstracts, vol. 123, No. 6, (Aug. 1995), Abstract No. 58164.
Kawakita Toshio
Kotani Kozo
Kuroda Toshiya
Sakaya Taiichi
Sumitomo Chemical Co,. Ltd.
Tarazano D. Lawrence
Thibodeau Paul
LandOfFree
Bio-degradable resin composition, film and shaped article does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bio-degradable resin composition, film and shaped article, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bio-degradable resin composition, film and shaped article will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2063118