GAS BARRIER LAYER FORMING COMPOSITION, GAS BARRIER FILM, PACKAGING FILM, AND PACKAGING BAG USING SAME, AND, GAS BARRIER FILM PRODUCTION METHOD, PACKAGING FILM PRODUCTION METHOD, AND PACKAGING BAG PRODUCTION METHOD

摘要

This gas barrier layer forming composition includes a solid component containing a polyurethane resin (A), a water-soluble polymer (B), and a hardener (C). The polyurethane resin (A) contains the product of a reaction between an acid group-containing polyurethane resin having an acid group, and a polyamine compound having an amino group. The content percentage of the polyurethane resin (A) in the solid component is between 45% by mass and 75% by mass inclusive, the content percentage of the water-soluble polymer (B) in the solid component is between 20% by mass and 35% by mass inclusive, and the content percentage of an inorganic layered mineral (D) in the solid component is less than 2% by mass.