Gas barrier resin composition and gas barrier composite film

摘要

Provided are a gas barrier resin composition, and a gas barrier composite film excellent in gas barrier properties with respect to oxygen, carbon dioxide gas, water vapor or the like, particularly in gas barrier properties even after hot water treatment. The gas barrier resin composition includes an oxazoline group-containing aqueous polymer (A), an aqueous acrylic resin (B) and/or an aqueous polyester resin (C) each at a specific concentration, wherein the ratio of the mole number of the oxazoline group to the mole number of the carboxyl group [the ratio of the mole number of the oxazoline group (x mmol) to the mole number of the carboxyl group (y mmol), which is indicated as (x/y)×100 (mol %)], is within the specific range. The gas barrier composite film uses this composition.

主权项

1. A gas barrier resin composition consisting essentially of 5 to 55 wt % of an oxazoline group-containing aqueous polymer (A) containing 6.0 to 9.0 mmol/g of an oxazoline group, and 95 to 45 wt % of an aqueous acrylic resin (B) containing 0.5 to 3.5 mmol/g of a carboxyl group, wherein the ratio of the mole number of the oxazoline group to the mole number of the carboxyl group [the ratio of the mole number of the oxazoline group (x mmol) to the mole number of the carboxyl group (y mmol), which is indicated as (x/y)×100 (mol %)], is 100 to 420 mol %, and
wherein the weight percentages of the oxazoline group-containing aqueous polymer (A) and the aqueous acrylic resin (B) total 100 wt % and are based on the total weight of the oxazoline group-containing aqueous polymer (A) and the aqueous acrylic resin (B).