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US 12,214,573 B2Granted
Gas barrier laminate and packaging material using the same
AssigneeToppan Inc.
InventorAyumi Tanaka
Life of this patent
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Abstract
A gas barrier laminate includes a polypropylene substrate layer; a first polyvinyl alcohol resin layer; and a metal oxide layer, which are laminated in this order, wherein the first polyvinyl alcohol resin layer has a mass per unit area of 0.5 to 2.5 g/m; and, a packaging material includes the above gas barrier laminate and a polypropylene sealant layer disposed on a surface of the gas barrier laminate, wherein a mass ratio of a sum of the polypropylene substrate layer and the polypropylene sealant layer to a total mass of the packaging material is 85 mass % or more.
Claims8
A packaging material consisting of:
- a polypropylene substrate layer;
- a first layer consisting essentially of ethylene-vinyl alcohol copolymer, the first layer is directly on the polypropylene substrate layer, the first layer having a mass per unit area of 0.5 to 2.5 g/m2, the first layer is formed on the polypropylene substrate layer by extrusion;
- a metal oxide layer consisting of silicon oxide or aluminum oxide, the metal oxide layer is directly on the first layer;
- a second layer directly on the metal oxide layer, the second layer consists essentially of polyvinyl alcohol and a silane compound;
- an adhesive and
- a polypropylene sealant layer bonded to the second layer via the adhesive, wherein a surface of the first layer in contact with the metal oxide layer has a surface roughness Sa of 0.2 μm or less.
3 more elements
Dependencies are inferred from the claim text.