Gas barrier laminate and packaging material including the same

Patent metadata

Field	Value
Publication number	US-2020331024-A1
Application number	US-202016922140-A
Country	US
Kind code	A1
Filing date	Jul 7, 2020
Priority date	Jan 19, 2018
Publication date	Oct 22, 2020
Grant date	—

Abstract

A gas barrier laminate including a resin substrate, a first coating layer containing a carboxylic acid polymer; and a second coating layer containing a polyvalent metal compound and a resin, laminated in this order; a ratio of a thickness of the second coating layer to the first coating layer in the range of 1.0 or more and 4.0 or less; and the second coating layer satisfies at least one of the following: (condition 1) a haze of the second coating layer is 8% or less; (condition 2) a surface roughness Ra of the second coating layer is ½ or less of the thickness of the second coating layer; and (condition 3) the number of concave portions having a diameter of 1.5 μm or more per unit area on a surface of the second coating layer opposite to the first coating layer is 2/0.01 mm2 or less.

First claim

What is claimed is:

1 . A gas barrier laminate, comprising:
a resin substrate; a first coating layer containing a carboxylic acid polymer; and a second coating layer containing a polyvalent metal compound and a resin, wherein: the resin substrate, the first coating layer, and the second coating layer are laminated in this order; a ratio of a thickness of the second coating layer to a thickness of the first coating layer is in the range of 1.0 or more and 4.0 or less; and the second coating layer satisfies at least one of the following conditions 1 to 3:
(condition 1) a haze of the second coating layer is 8% or less;
(condition 2) a surface roughness Ra of the second coating layer is ½ or less of the thickness of the second coating layer; and
(condition 3) the number of concave portions having a diameter of 1.5 μm or more per unit area on a surface of the second coating layer opposite to the first coating layer is 2/0.01 mm 2 or less.

2 . The gas barrier laminate of claim 1 , wherein the thickness of the second coating layer is in the range of 0.10 μm or more and 0.50 μm or less.

3 . The gas barrier laminate of claim 1 , wherein:
the polyvalent metal compound is zinc oxide; and a content of the zinc oxide is in the range of 65 mass % or more and 85 mass % or less relative to a mass of the second coating layer.

4 . The gas barrier laminate of claim 1 , further comprising an inorganic vapor deposition layer that contains an inorganic oxide and is provided between the resin substrate and the first coating layer.

5 . The gas barrier laminate of claim 4 , further comprising a primer layer that contains a urethane compound and is provided between the resin substrate and the inorganic vapor deposition layer.

6 . The gas barrier laminate of claim 1 , wherein the first coating layer is in direct contact with the second coating layer.

7 . The gas barrier laminate of claim 1 , wherein the gas barrier laminate is for use as a packaging material to be subjected to retort treatment or boiling treatment.

8 . A gas barrier laminate, comprising:
a film substrate formed of a plastic material; and a coating layer provided on the film substrate, wherein: the coating layer includes a first coating layer and a second coating layer; the first coating layer contains a polycarboxylic acid polymer and at least one silicon-containing compound selected from the group consisting of a silane coupling agent expressed by a general formula R 1 Si(OR 2 ) 3 , a hydrolysate of the silane coupling agent, and condensates of the silane coupling agent and the hydrolysate; the second coating layer contains a polyvalent metal compound having an ultraviolet absorbance in the range of 0.3 or more and 0.7 or less, the ultraviolet absorbance being a value obtained by subtracting an absorbance at a wavelength of 500 nm from an absorbance at a wavelength of 350 nm measured by absorptiometry; in the first coating layer, a ratio of a mass of the polycarboxylic acid polymer to a mass of the silicon-containing compound is in the range of 99.5/0.5 to 80.0/20.0; the mass of the silicon-containing compound is expressed in terms of the silane coupling agent; and in the general formula, R 1 is an organic group containing a glycidyloxy group or an amino group, R 2 is an alkyl group, and the three R2 are equal to or different from each other.

9 . The gas barrier laminate of claim 8 , wherein the polyvalent metal compound is zinc oxide.

10 . The gas barrier laminate of claim 8 , further comprising:
an adhesive layer; and an inorganic vapor deposition layer formed of an inorganic oxide, wherein the adhesive layer and the inorganic vapor deposition layer are provided between the film substrate and the coating layer.

11 . The gas barrier laminate of claim 8 , further comprising:
a modification treatment layer provided on the film substrate; and an inorganic vapor deposition layer that is formed of an inorganic oxide and provided on the modification treatment layer, wherein the coating layer is provided on the inorganic vapor deposition layer.

12 . The gas barrier laminate of claim 10 , wherein the inorganic oxide is aluminum oxide or silicon oxide.

13 . The gas barrier laminate of claim 8 , wherein:
a ratio of a thickness of the second coating layer to a thickness of the first coating layer is in the range of 1.0 or more and 4.0 or less; and the second coating layer satisfies at least one of the following conditions 1 to 3:
(condition 1) a haze of the second coating layer is 8% or less;
(condition 2) a surface roughness Ra of the second coating layer is ½ or less of the thickness of the second coating layer; and
(condition 3) the number of concave portions having a diameter of 1.5 μm or more per unit area on a surface of the second coating layer opposite to the first coating layer is 2/0.01 mm 2 or less.

14 . A packaging material comprising the gas barrier laminate of claim 1 .

Assignees

• Toppan Printing Co Ltd

Inventors

• Okamura Kengo
• Fukugami Miki

Classifications

• C23C14/081

  of aluminium, magnesium or beryllium · CPC title

• C08J2475/08

  from polyethers · CPC title

• C08J2433/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08J7/048

  Forming gas barrier coatings · CPC title

• C08J7/043

  Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50) · CPC title