Gas barrier laminates and food packaging materials using the same

Abstract

The present invention addresses the problem of providing a gas-barrier laminated film using a gas-barrier substrate film having an inorganic thin film layer, thereby improving gas barrier properties, exhibiting excellent barrier properties after bending, and demonstrating excellent recyclability. The gas-barrier laminated film claimed in this invention comprises a first substrate film and a second substrate film, and an adhesive layer acting as a spacer between the first and second substrate films. At least one of the first and second substrate films has an inorganic thin film layer formed on its outermost surface, which is in contact with the adhesive layer. When the portion formed by the substrate film and the inorganic thin film layer on the outermost surface of the substrate film is referred to as the gas-barrier substrate film, the water vapor permeability (W1) of the gas-barrier substrate film and the water vapor permeability (W2) of the gas-barrier laminated film satisfy the following Equation 1: Equation 1: 100 - [(W2 / W1) × 100] ≥ 60