Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-04-07
1999-01-12
Chen, Vivian
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 366, 428195, 428200, 428337, 428339, 428343, 428347, 428480, 428910, 2065246, 206531, 206532, B32B 2706, B32B 2708, B32B 2736
Patent
active
058584900
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP94/00951, filed Jun. 10, 1994.
TECHNICAL FIELD
The present invention relates to a polyethylene-2,6-naphthalate resin and a film comprising said resin. More particularly, the present invention relates to a packaging film which has a gas barrier property and, further, is easy to open and easy to tear and has a press-through property, and various packaging applications based on said film.
BACKGROUND ART
Aromatic polyesters exemplified by polyethylene terephthalate (hereinafter abbreviated to "PET") and polybutylene terephthalate (PBT) have excellent mechanical strength, heat resistance, chemical resistance and other properties and, hence, have been widely used in various industrial applications. Among them, polyethylene-2,6-naphthalate (hereinafter abbreviated to "PEN") is superior to PET in mechanical strength (Young's modulus and breaking strength), heat resistance (longterm heat stability and dimensional stability), chemical properties (chemical resistance and gas barrier property) and other properties by virtue of the rigidity and plainness of the molecular chain and, in recent years, have attracted considerable attention (Japanese Patent Publication Nos. 29541/1973 and 40917/1973). High-performance films of PEN, which have utilized the above properties, for example, base films for magnetic tapes and capacitor films, are currently on the market. Further, PEN is a promising candidate for use in other applications, that is, as a high-performance packaging material in the field of various packaging materials.
Paper, various plastics and the like are currently in use as packaging materials and applied to packaging materials having a gas barrier property, freshness retaining packaging materials, heat-resistant packaging materials, easy-open packaging materials and mischief preventive packaging materials.
Regarding easy-open packages, various easy-open packaging materials have been developed such as those using a stretched film, as disclosed in Japanese Patent Laid-Open Nos. 55059/1988 and 96066/1988 and Japanese Utility Model Publication No. 11258/1979; easy-tear packaging materials exemplified by pouches provided with a cut, a scratch, a perforation or an opening tape, as disclosed in Japanese Patent Laid-Open Nos. 52065/1987, 39465/1987, 82965/1988, and 67273/1988; peelable packaging materials wherein the contents are taken out by peeling off a heat-sealed cover, as disclosed in Japanese Patent Laid-Open Nos. 109768/1987, 27254/1988, 96067/1988, and 307073/1988; and easy-open caps.
For easy-tear packaging materials, air tightness and an increase in speed have been pursued in bag making/charge packing, and regarding opening, it is a common practice to use a method in which the end face of a bag is subjected to sealer tear cutting so that tearing can be carried out from the bottom, or a notch is provided so that tearing can be carried out from the notch (Japanese Patent Laid-Open No. 39465/1987). In the above methods, troubles frequently occur including that the bag cannot be torn straight, the contents are damaged, or the liquid is scattered. On the other hand, vacuum packaging or retort packaging is, in many cases, inconvenient because a cutting tool should be used or it is difficult to take out the contents from the package because the contents are adhered to the bag. In recent years, easy-tear packaging materials with various ideas being incorporated have been developed.
Overlap packages in confectionery and tobaccos are generally provided with an opening tape (Japanese Patent Laid-Open No. 67273/1988) to impart an easy-open property to the packages. In general, the overlap package is produced by a single packaging system, and an easy-open stretched polyethylene (Japanese Patent Laid-Open No. 55059/1988), polypropylene, or cellophane is used in a small thickness (20 to 30 .mu.m) to impart an easy-open property to the film. On the other hand, for shrink packaging, the material, thickness, packaging machine, package form, and the like for the film used vary depending
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Ito et al., "Two-Stage Drawing of Poly(Ethylene 2,6-Naphthalate)", Journal of Applied Polymer Science, vol. 46, No. 6, Oct. 25, 1992, pp. 1013-1023.
Journal of Applied Polymer Science, vol. 46, No. 6, Oct. 25 1992, pp. 1013-1023, Masayoshi Ito et al. "Two-Stage Drawing of Poly(Ethylene 2,5-Naphthalate)".
Harada Yasuhiro
Hasegawa Kayo
Inoue Isao
Kumaki Chikao
Mori Shinichiro
Chen Vivian
Dai Nippon Printing Co. Ltd.
NKK Corporation
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