Gas barrier film and barrier laminate
AssigneeToppan Holdings Inc.
InventorTetsuo Satake
Life of this patent
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Abstract
A gas barrier film includes: a substrate layer containing polypropylene or polyethylene as a main component; a gas barrier layer formed on a side of a first surface of the substrate layer; and a heat seal layer that is formed on a second surface opposite to the first surface and contains polypropylene or polyethylene as a main component. A peel strength between the substrate layer and the heat seal layer is 1.0 N/15 mm or more and 7.0 N/15 mm or less in a 180° peel test in accordance with JIS K 6854-2, and 1.0 N/15 mm or more and 4.0 N/15 mm or less in a T-peel test in accordance with JIS K 6854-3.
Claims20
A gas barrier laminate, comprising:
- a substrate containing polypropylene or polyethylene as a main component;
- a gas barrier layer formed on a side of a first surface of the substrate;
- and
- a heat seal layer that is formed on a second surface of the substrate, the second surface being opposite to the first surface of the substrate, and the heat seal layer contains polypropylene or polyethylene as a main component, wherein
- a peel strength between the substrate and the heat seal layer is
- 1.0 N/15 mm or more and 7.0 N/15 mm or less in a 180° peel test in accordance with JIS K 6854-2,
- 1.0 N/15 mm or more and 4.0 N/15 mm or less in a T-peel test in accordance with JIS K 6854-3, and
- a polar component value of a surface free energy of the second surface of the substrate is in a range from 0.1 mJ/m2 to 1.0 mJ/m2.
A gas barrier laminate, comprising:
- a substrate layer having a three-layer structure consisting of (i) a first layer of 0.5 μm to 2 μm thickness comprising an ethylene-vinyl alcohol copolymer, (ii) a second layer of 10 μm to 30 μm thickness comprising a polypropylene homopolymer, and (iii) a third layer of 0.5 μm to 2 μm thickness comprising a terpolymer of propylene, ethylene, and 1-butene;
- a gas barrier layer formed on the first layer of the substrate layer, the gas barrier layer comprising silicon oxide and having a thickness of 10 nm to 100 nm;
- a coating layer formed on the gas barrier layer, the coating layer comprising a mixture of polyvinyl alcohol and a hydrolysate of tetraethoxysilane and having a thickness of 0.1 μm to 1.0 μm;
- and a heat seal layer comprising polypropylene bonded to the third layer of the substrate layer;
- wherein a polar component value of a surface free energy of a surface of the third layer is in a range from 0.1 mJ/m2 to 0.4 mJ/m2, a peel strength between the substrate layer and the heat seal layer is 2.0 N/15 mm or more and 7.0 N/15 mm or less in a 180° peel test, and a difference between maximum and minimum values of the peel strength in the 180° peel test is less than 0.3 N/15 mm.
Dependencies are inferred from the claim text.