Gasundurchlässiger Schichtstoff und Verfahren zu seiner Herstellung

摘要

A laminate having a laminated structure of at least two layers includes a gas barrier film (A) formed from a mixture containing at least one poly(meth)acrylic acid polymer selected from the group consisting of poly(meth)acrylic acid and partially neutralized products thereof and a saccharide in a weight ratio of 95:5 to 20:80, and having an oxygen permeability constant of 5.00 x 10<-><3> ml(STP).cm/m<2>.h.atm{Pa} or smaller as measured under conditions of 30 DEG C and 80% relative humidity, and a layer (B) formed from a thermoplastic resin. The film (A) and the layer (B) are laminated contiguously to each other. A process for the production of a laminate having a laminated structure of at least two layers comprises a step of forming a gas barrier film (A) having an oxygen permeability constant of 5.00 x 10<-><3> ml(STP).cm/m<2>.h.atm{Pa} or smaller as measured under conditions of 30 DEG C and 80% RH, wherein a solution containing at least one poly(meth)acrylic acid polymer selected from the group consisting of poly(meth)acrylic acid and partially neutralized products thereof and a saccharide in a weight ratio of 95:5 to 20:80 is coated on a layer (B) formed from a thermoplastic resin, the solution coated is dried to form a film, and the film is then subjected to a heat treatment at a temperature of at least 100 DEG C (373K). The film (A) and the layer (B) are contiguous to each other.