GAS BARRIER FILM AND ITS PRODUCTION

摘要

PURPOSE:To obtain a film which hardly discolors and is water-resistant and excellent in oxygen barrier properties at a high humidity. CONSTITUTION:A gas barrier film is obtd. from a resin mixture comprising 95-10wt.% polyvinyl alcohol and 5-90wt.% partially neutralized poly(meth)acrylic acid and has an oxygen permeation coefficient (at a relative humidity of 80%) of 1.25X10<-3>ml(STP).cm/m<2>.h.atm{Pa} or lower. The resin mixture is formed into a film and thermally treated under conditions satisfying the relations: log t>=-0.0582XT+26.06 and 373>=T>=573 [wherein t is the time (min) of thermal treatment; and T is the temp. (K) of the treatment], giving the gas barrier film.