GAS BARRIER FILM AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide film technology containing a new gas barrier layer without using polyvinyl alcohol and provide technology capable of effectively improving oxygen barrier property by electron beam irradiation. SOLUTION: A film of a gas barrier layer is formed on a substrate film by a partially neutralized material of polyacrylic acid having a neutralization degree represented by the formula 20<=n<=40. Then, the film is irradiated with electron beam having 50 kGy to 200 kGy, more preferably 60 kGy to 90 kGy dose. Gas barrier layer after electron beam irradiation exhibits a high oxygen barrier property of <10 cc/atm/m2/day oxygen permeability at 23 deg.C and 70% relative humidity.