Gas-barrier laminate having favorable water-barrier property

Patent metadata

Field	Value
Publication number	US-9956748-B2
Application number	US-201415028083-A
Country	US
Kind code	B2
Filing date	Oct 8, 2014
Priority date	Oct 10, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A gas-barrier laminate ( 10 ) of a structure in which a first inorganic barrier layer ( 3 ), a water-trapping layer ( 5 ) and a second inorganic barrier layer ( 9 ) are provided in this order on a plastic base material ( 1 ), wherein the water-trapping layer ( 5 ) is a layer in which a granular moisture-absorbing agent is dispersed in a matrix of an ionic polymer, the granular moisture-absorbing agent being capable of absorbing moisture to a degree lower than that attained by the matrix, and an organic layer ( 7 ) is provided between the water-trapping layer ( 5 ) and the second inorganic barrier layer ( 9 ), the organic layer ( 7 ) serving as an underlying layer for forming the second inorganic barrier layer. The water-trapping layer has excellent barrier property against water and is, at the same time, effectively suppressed from swelling despite it has absorbed moisture. The water-trapping layer is, further, effectively suppressed from losing its activity.

First claim

The invention claimed is:

1. A gas-barrier laminate of a structure in which a first inorganic barrier layer, a water-trapping layer and a second inorganic barrier layer are provided in this order on a plastic base material, wherein:
said water-trapping layer is a layer in which a granular moisture-absorbing agent is dispersed in a matrix of an ionic polymer, the granular moisture-absorbing agent being more hygroscopic than the matrix that it is dispersed in;
an organic layer is provided between said water-trapping layer and the second inorganic barrier layer, the organic layer serving as an underlying layer for forming said second inorganic barrier layer; and
second inorganic barrier layer has a water vapor permeability of not more than 10 −1 g/m 2 /day which is larger than a water vapor permeability of the first inorganic barrier layer.

2. The gas-barrier laminate according to claim 1 , wherein said granular moisture-absorbing agent is a crosslinked product of a monovalent metal salt of poly(meth)acrylic acid.

3. The gas-barrier laminate according to claim 1 , wherein a crosslinked structure has been introduced into the ionic polymer that is forming said matrix.

4. The gas-barrier laminate according to claim 1 , wherein said organic layer has an adhesive force to the water-trapping layer of not less than 1.0 N/15 mm.

5. The gas-barrier laminate according to claim 4 , wherein said organic layer is a resin layer having a glass transition point of not lower than 60° C.

6. The gas-barrier laminate according to claim 5 , wherein said organic layer is formed of a polyester resin, a cycloolefin-type resin, a (meth)acrylic resin or a halogen-type resin.

7. The gas-barrier laminate according to claim 1 , wherein the first inorganic barrier layer is an inorganic oxide film formed by the CVD method.

8. The gas-barrier laminate according to claim 1 , wherein the gas-barrier laminate has a water vapor permeability of not more than 10 −5 g/m 2 /day.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Okuyama Shinpei
• Obu Yusuke
• Nangou Shunya
• Kawahara Naru

Classifications

• C08J2479/02

  Polyamines · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B9/045

  of synthetic resin · CPC title

• C08J2479/00

  Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00 · CPC title

• C08J2433/08

  Homopolymers or copolymers of acrylic acid esters · CPC title