GAS-BARRIER MULTILAYER STRUCTURE AND PROCESS FOR PRODUCING THE SAME

• Main Authors: KANDA, TOMOMICHI, MARUO, KAZUNOBU
• Format: Patent
• Language: English; French; German
• Published: 21.03.2012
• Subjects: 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; 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

A gas-barrier, multi-layer structure includes at least one gas barrier layer and at least one resin layer. The gas-barrier layer is made of a composite resin C containing a polyamide resin and a phyllosilicate treated with an organic swelling agent. The polyamide resin is obtained by polycondensing m-xylylenediamine with an ±, É-linear aliphatic dicarboxylic acid. The resin layer is made of a thermoplastic resin D having a glass transition point lower than that of the composite resin C. The gas-barrier, multi-layer structure is produced by stretch-thermoforxning an unstretched laminate under specific conditions. With such stretch-thermoforming under specific conditions, the whitening and the reduction of gas-barrier property each being due to fine cracks in the resin are prevented, to provide the multi-layer structure excellent in the transparency and gas-barrier property.