GAS BARRIER PACKAGING MATERIAL PRECURSOR, METHOD FOR PRODUCING SAME, GAS BARRIER PACKAGING MATERIAL, AND METHOD FOR PRODUCING PACKAGE

摘要

This gas barrier packaging material precursor is provided with: a support; a gas barrier layer disposed directly on the support and containing a polycarboxylic acid polymer and at least one silicon compound selected from the group consisting of hydrolyzable silane compounds, hydrolyzates thereof, and their condensates; and a protective layer disposed directly on the gas barrier layer and containing a multivalent metal component, a polyester resin, and a dispersing agent. The water vapor transmission rate of the support at 40°C and a relative humidity of 90% is at least 100 g/m², the content of the multivalent metal component is 40 to 90 mass% with reference to the total mass of the protective layer, the content of the dispersing agent is 2 to 20 mass% with reference to the multivalent metal component, and the content of the silicon compound is 2 to 25 mass% with reference to the polycarboxylic acid polymer. In measurement of the infrared absorption spectrum of the gas barrier layer, the ratio (α／β) between the maximum peak height (α) for the absorbance in the wavenumber range of 1490 cm^–1 to 1659 cm^–1 and the maximum peak height (β) for the absorbance in the wavenumber range of 1660 cm^–1 to 1750 cm^–1 is at least 1 and less than 7.