| 摘要 |
PROBLEM TO BE SOLVED: To improve gas barrier properties under high humidity and gas barrier properties and adhesion properties after an endurance test by a method wherein a surface roughness parameter of a gas barrier film coated surface having water-soluble polymer and inorganic lamellar particle as main constituents at least on one side of a thermoset base material is made a specific numerical value or under. SOLUTION: The lamellar particle means an inorganic particle wherein very thin unit crystal layers are piled on each other to form one lamellar particle. A clay compound having swelling properties especially to a solvent is favorable. A surface roughness parameter RH of a coated surface is a maximum height and a distance from the highest crest to the deepest valley of a surface roughness curve, and Ra is a mean roughness of the center line. The surface roughness parameter Rt/Ra is necessarily 20 or under, and is best at about 10 or under. The Rt is favorable at about 1.4μm or under. The reason is because the coating layer is scraped off by contact to a roll in forming the coating at a high speed or by contact of the films to each other in winding, and the gas barrier properties and adhesion after an endurance test sometimes are deteriorated.
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