Gas barrier laminate and production process thereof

Details Gas barrier laminate and production process thereof Gas barrier laminate and production process thereof

1995-01-25

1996-10-01

Sluby, P. C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428516, 428518, 428520, B32B 2730

Patent

active

055609880

ABSTRACT:
A gas barrier laminate having a laminated structure of at least two layers includes a gas barrier film (A) formed from a mixture containing polyvinyl alcohol and poly(meth)acrylic acid or a partially neutralized product thereof in a weight ratio ranging from 95:5 to 10:90, and having an oxygen permeability constant of 1.25.times.10.sup.-3 ml(STP).multidot.cm/m.sup.2 .multidot.h.multidot.atm{Pa} or smaller as measured under conditions of 30.degree. C. and 80% relative humidity, and a layer (B) formed from a thermoplastic resin. The film (A) and layer (B) are laminated contiguously to each other. A process for the production of a gas barrier 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 1.25.times.10.sup.-3 ml(STP).multidot.cm/m.sup.2 .multidot.h.multidot.atm{Pa} or smaller as measured under conditions of 30.degree. C. and 80% relative humidity, wherein a solution containing polyvinyl alcohol and poly(meth)acrylic acid or a partially neutralized product thereof in a weight ratio ranging from 95:5 to 10:90 is cast on a layer (B) formed from a thermoplastic resin, the solution cast is dried to form a film, and the dry film is then subjected to a heat treatment at a temperature of at least 100.degree. C. (373 K). The gas barrier film (A) and the layer (B) are contiguous to each other.

REFERENCES:
patent: 2169250 (1939-08-01), Izard
patent: 4048428 (1977-09-01), Baird, Jr. et al.

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