Epoxy resin composition, gas barrier multilayer body, retort food packaging material, packaging material for deodorization or aroma retention, heat shrinkable label and method for producing same, heat shrunk label and bottle having same

Patent metadata

Field	Value
Publication number	US-12415347-B2
Application number	US-202117795120-A
Country	US
Kind code	B2
Filing date	Jan 22, 2021
Priority date	Feb 4, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

An epoxy resin composition including an epoxy resin, an epoxy resin curing agent containing an amine-based curing agent, and an unsaturated fatty acid amide having from 14 to 24 carbons, a gas barrier laminate and a retort food packaging material using the epoxy resin composition, an odor-proofing or aroma-retaining packaging material, an odor-proofing or aroma-retaining method of sealing an article containing an odorous component or an aromatic component in the packaging material, a heat-shrinkable label, the production method of the heat-shrinkable label, a heat-shrunken label and a bottle having the heat-shrunken label, and a CO2 transmission prevention method.

First claim

The invention claimed is:

1. An epoxy resin composition comprising an epoxy resin, an epoxy resin curing agent comprising an amine-based curing agent and an unsaturated fatty acid amide having 14 to 24 carbons, wherein a content of the unsaturated fatty acid amide in the epoxy resin composition is from 3 to 20 parts by mass per 100 parts by mass of the total amount of the epoxy resin and a nonvolatile content in the epoxy resin curing agent.

2. The epoxy resin composition according to claim 1 , wherein the amine-based curing agent is an amine-based curing agent (i):
(i) a reaction product of a component (A) and a component (B):
(A) at least one selected from the group consisting of meta-xylylenediamine and para-xylylenediamine, and
(B) at least one selected from the group consisting of unsaturated carboxylic acids represented by Formula (1) and derivatives thereof;

where, in Formula (1), R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having from 1 to 8 carbons, an aryl group having from 6 to 12 carbons, or an aralkyl group having from 7 to 13 carbons.

3. The epoxy resin composition according to claim 1 , wherein the epoxy resin comprises, as a main component, an epoxy resin having a glycidylamino group derived from meta-xylylenediamine.

4. The epoxy resin composition according to claim 1 , wherein the unsaturated fatty acid amide is at least one selected from the group consisting of an oleic acid amide and an erucic acid amide.

5. The epoxy resin composition according to claim 1 , wherein the epoxy resin composition further comprises a non-spherical inorganic particle.

6. The epoxy resin composition according to claim 1 , wherein a ratio of the number of active amine hydrogens in the epoxy resin curing agent to the number of epoxy groups in the epoxy resin is more than 1.0 and 5.0 or less.

7. A gas barrier laminate comprising a substrate and a cured resin layer, the cured resin layer being a cured product of the epoxy resin composition described in claim 1 .

8. The gas barrier laminate according to claim 7 , wherein the gas barrier laminate comprises at least one layer composed of an inorganic substance.

9. The gas barrier laminate according to claim 8 , wherein the layer composed of the inorganic substance is an inorganic thin film layer having a thickness of 5 nm or more and 100 nm or less, and the inorganic substance in the inorganic thin film layer is at least one selected from the group consisting of a silicon oxide, aluminum, and an aluminum oxide.

10. The gas barrier laminate according to claim 8 , wherein the layer composed of the inorganic substance is adjacent to the cured resin layer.

11. The gas barrier laminate according to claim 7 , further comprising a thermoplastic resin layer.

12. A retort food packaging material comprising the gas barrier laminate described in claim 11 .

13. An odor-proofing or aroma-retaining packaging material comprising a substrate and a cured product layer of the epoxy resin composition according to claim 1 .

14. The odor-proofing or aroma-retaining packaging material according to claim 13 , wherein a thickness of the cured product layer is from 0.02 to 0.6 μm.

15. A method for odor proofing or aroma retaining, the method comprising an odorous component or an aromatic component in a packaging material, the packaging material comprising a substrate and a cured product layer of the epoxy resin composition according to claim 1 .

16. A heat-shrinkable label comprising a heat-shrinkable substrate layer and a cured product layer of the epoxy resin composition according to claim 1 .

17. The heat-shrinkable label according to claim 16 , wherein the heat-shrinkable label comprises only one layer of the heat-shrinkable substrate layer and only one layer of the cured product layer.

18. A method for producing the heat-shrinkable label described in claim 16 , wherein the method comprises (I) and (II) sequentially:
(I): applying the epoxy resin composition, the epoxy resin composition further comprising a solvent, on a surface of at least one side of a heat-shrinkable substrate and forming a coating layer
(II): heating and drying the coating layer at a temperature of less than 100° C. and removing the solvent.

19. The epoxy resin composition according to claim 1 , wherein a content of the unsaturated fatty acid amide in the epoxy resin composition is from 3 to 15 parts by mass per 100 parts by mass of the total amount of the epoxy resin and a nonvolatile content in the epoxy resin curing agent.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Kouno Kazuki
• Hashimoto Ryoma
• Kobayashi Naoko

Classifications

• C08K5/20 Primary

  Carboxylic acid amides · CPC title

• C08G59/5033

  aromatic · CPC title

• C08G59/32

  Epoxy compounds containing three or more epoxy groups · CPC title

• B32B2439/70

  Food packaging · CPC title

• B32B2307/7248

  Odour barrier · CPC title