Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1996-11-12
1998-12-29
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428216, 4284235, 4284237, 4284242, 428451, 428458, 4274121, 4274125, 4274192, B32B 1508
Patent
active
058538623
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a barrier composite film having improved barrier properties typically with respect to water vapor, oxygen gas and aroma or fragrance component and being, therefore, suitable for use as a film for preservation of a dried food, a film for the retort treatment or microwave heating of food or a packaging film for pharmaceutical products and precision electronic devices, films for production of a balloon or fly balloon, among other applications, and a method for producing the film.
BACKGROUND TECHNOLOGY
Coating of a base film with an extremely thin layer of an inorganic oxide insures remarkable improvement of barrier properties of the base film and hence provides a broader choice for the base film in relation with the heat resistance, mechanical characteristics or other characteristics. The composite films each having a thin layer of an inorganic oxide can roughly be classified into the following categories. on a base film
By way of illustration, Japanese Patent Application Laid-open No. 27532/1985 (JP-A-60-27532) discloses a composite film produced by depositing a transparent thin layer of a magnesium oxide on a polyolefinic film and forming a polymer layer on the thin layer by dry-laminating or extrusion-laminating. Japanese Patent Application Laid-open No. 202435/1989 (JP-A-1-202435) and Japanese Patent Application Laid-open No. 202436/1989 (JP-A-1-202436) each discloses a packaging material for microwave cooker use or retort processing which comprises a base film supporting a vapor-deposited silicon oxide layer and either a heat-sealing layer or a protective layer, the heat-sealing layer comprising a heat-sealing resin film, typically a polypropylene film, as laminated, while the protective layer comprising a film as laminated or a thermosetting resin layer as coated. Japanese Patent Application Laid-open No. 297237/1989 (JP-A-1-297237) discloses lamination of a film carrying an inorganic oxide thin layer with a biaxially oriented nylon film, and Japanese Patent Application Laid-open No. 86539/1991 (JP-A-3-86539) discloses laminating or coating of a film supporting an inorganic oxide thin layer with a vinylidene chloride-based resin, for example.
These composite films (i) are, however, liable to be fluctuated in barrier properties or other properties and hence can hardly provides excellent barrier properties with stability. Therefore, when such films are used as a film for retort treatment application which is subjected to a sterilization treatment in an autoclave for steam sealing at a temperature of not lower than 100.degree. C., characteristics of the film such as adhesion (adhesive properties) between layers or barrier properties after retort treatment are remarkably sacrificed. Further, when the inorganic oxide layer is formed directly on the base film, the resultant composite film is apt to curl so that handling properties in processing steps are deteriorated. pretreated surface of a base film
For instance, Japanese Patent Application Laid-open No. 12953/1978 (JP-A-53-12953) discloses a composite film which comprises a base film and a silicon oxide thin layer with transparency formed on a pretreated surface of the base film, and Japanese Patent Application Laid-open No. 237940/1988 (JP-A-63-237940) discloses a composite film comprising typically an indium oxide or tin oxide-sputtered film carrying a heat-sealing layer typically composed of an ethylene-propylene copolymer.
However, when the composite film (ii) is employed as a film for retort treatment application, adhesion between the base film and the inorganic oxide thin layer is significantly decreased and barrier properties are remarkably sacrificed. base film, and an inorganic oxide thin layer formed on the undercoat layer.
By way of an example, Japanese Patent Application Laid-open No. 173137/1992 (JP-A-4-173137) discloses a laminate for a balloon having a high barrier property for helium and hydrogen gas as produced by forming an under coat layer formed on a film, an inorganic oxide thin laye
REFERENCES:
patent: 5100720 (1992-03-01), Sawada et al.
Miyake Ryuta
Murai Takaaki
Daicel Chemical Industries Ltd.
Tarazano D Lawrence
Thibodeau Paul J.
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