Coating liquid and gas barrier laminate

Patent metadata

Field	Value
Publication number	US-11078372-B2
Application number	US-201815955166-A
Country	US
Kind code	B2
Filing date	Apr 17, 2018
Priority date	Oct 20, 2015
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A coating liquid includes: ultrafine zinc oxide particles; a polyester resin; an ammonium polycarboxylate salt; and water, in which an amount of the ammonium polycarboxylate salt is from 1 to 35 mass % with respect to that of the ultrafine zinc oxide particles.

First claim

What is claimed is:

1. A gas barrier laminate comprising:
a base material; and
a gas barrier layer formed on the base material and comprising a layer (A) formed from a coating liquid, and a layer (B) containing polycarboxylate polymers, each polymer of polycarboxylate polymers having two or more carboxyl groups, wherein
the coating liquid comprises ultrafine zinc oxide particles, a polyester resin, an ammonium polycarboxylate salt, and water,
an amount of the ultrafine zinc oxide particles is from 65 mass % to 90 mass % with respect to a solid content of the coating liquid,
an amount of the ammonium polycarboxylate salt is from 1 mass % to 5 mass % with respect to the ultrafine zinc oxide particles, and
the polyester resin has an acid value of 15 mg KOH/g or less, and

the layer (A) and the layer (B) are adjacent to each other in the gas barrier layer.

2. The gas barrier laminate according to claim 1 , further comprising:
another base material laminated on at least one of the base material and the gas barrier layer via an adhesive layer.

3. The gas barrier laminate according to claim 1 , wherein
a part of carboxyl groups of the polycarboxylate polymers of the layer (B) is a neutralized part of the carboxyl groups of the polycaboxylate polymers.

4. The gas barrier laminate according to claim 1 , wherein
a degree of neutralization of the carboxyl groups of the polycarboxylate polymers of the layer (B) is 30 mol % or less.

5. The gas barrier laminate according to claim 1 , wherein
a thickness of the layer (A) is 0.05 μm to 5 μm, and
a thickness of the layer (B) is 0.05 μm to 5 μm.

6. The gas barrier laminate according to claim 1 , wherein
a mass per unit area of the layer (A) is ⅓ or more times a mass per unit area of the layer (B) and 10 or less times a mass per unit area of the layer (B).

Assignees

• Toppan Printing Co Ltd

Inventors

• MATSUI Miyu
• TAKEUCHI Iori
• Kashimura Masayuki

Classifications

• B32B2439/80

  Medical packaging · CPC title

• B32B2439/40

  Closed containers · CPC title

• B32B2255/20

  Inorganic coating · CPC title

• B32B2307/7244

  Oxygen barrier · CPC title

• B32B2255/28

  Multiple coating on one surface · CPC title