MULTILAYER PLASTIC SHEET WITH GAS BARRIER PROPERTIES

PURPOSE:To obtain a multilayer sheet excellent in gas barrier properties and stiffness, favorable in deep drawability and useful as a blank material for various containers by specifying the thickness of each of a sheath layer, a core layer and an adhesive layer. CONSTITUTION:A multilayer plastic she...

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Hauptverfasser:	OKAMOTO KIMIMASA, AKI KENZOU, TSUGAI NAOHIKO, YAGI TAKUJI, TANIMOTO KENICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING HANDLING THIN OR FILAMENTARY MATERIAL INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS STORING TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a multilayer sheet excellent in gas barrier properties and stiffness, favorable in deep drawability and useful as a blank material for various containers by specifying the thickness of each of a sheath layer, a core layer and an adhesive layer. CONSTITUTION:A multilayer plastic sheet with gas barrier properties comprises a sheath layer comprising polyethylene terephthalate or a thermoplastic polyester containing at least 80mol% of ethylene terephthalate units, a core layer comprising an amorphous polyamide resin having isophthalic acid as an acid component and hexamethylenediamine as an amine component, and a modified polyolefin adhesive layer. The thickness of the sheath layer is 70-98%, the thickness of the core layer is 1-15%, and the thickness of the adhesive layer is 1-15%, all percentages being based on the total thickness of the plastic sheet. When the thickness of the core layer is less than 1% based on the total thickness, the gas barrier properties obtained are poor, whereas a core layer with thickness of more than 15% leads to a problem as to deep drawability. When the thickness of the adhesive layer is less than 1% based on the total (thickness, bonding strength is poor, whereas an adhesive layer thickness of more than 15% is unfavorable from an economical point of view.