Multilayer article suitable for use of storage bag for agricultural products

Patent metadata

Field	Value
Publication number	US-11400694-B2
Application number	US-201916554032-A
Country	US
Kind code	B2
Filing date	Aug 28, 2019
Priority date	Aug 30, 2018
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

A multilayer article having at least one layer of an ethylene vinyl alcohol (EVOH) resin composition comprising of an ethylene-vinyl alcohol copolymer, an unmodified ethylene-α-olefin copolymer and acid modified ethylene-α-olefin copolymer as described below, which is suitable for use in making (or as) a storage bag for agricultural products, food, drink, pharmaceutical, cosmetic, industrial chemical, detergent products.

First claim

The invention claimed is:

1. A multilayer article comprising at least one layer formed from an EVOH resin composition consisting of:
an ethylene-vinyl alcohol copolymer (A), having a degree of saponification of 99 mol % or greater and an ethylene content of about 18 mol % or greater and about 55 mol % or less;
an unmodified ethylene-α-olefin copolymer (B);
an acid-modified ethylene-α-olefin copolymer(C); and
optionally an additive selected from the group consisting of a boron compound, an alkali metal salt and a phosphoric acid compound;
wherein
a mass ratio [(A)/((B)+(C))] of the ethylene-vinyl alcohol copolymer (A) to a total amount of the unmodified ethylene-α-olefin copolymer (B) and the acid modified ethylene-α-olefin copolymer (C) is from about 95/5 to about 75/25,
a mass ratio [(B)/(C)] of the unmodified ethylene-α-olefin copolymer (B) to the acid modified ethylene-α-olefin copolymer (C) is from 65/35 to about 5/95, and
a total thickness of the multilayer article is 100 μm or greater and less than 500 μm.

2. The multilayer article of claim 1 , wherein the multilayer article is a multilayer film.

3. The multilayer article of claim 1 , comprising:
(i) a core layer (E),
(ii) an outer layer (T) obtained from a polyolefin resin, and
(iii) an adhesive layer (Ad) between the core layer and the outer layer,
wherein the core layer (E) is of the EVOH resin composition.

4. The multilayer article of claim 3 , comprising two outer layers, and an adhesive layer between each outer layer and the core layer.

5. The multilayer article of claim 4 , wherein the total thickness of the multilayer article is from 100 μm to about 400 μm, the thickness of each outer layer T is from about 25 μm to about 200 μm, and the thickness ratio of the core layer E to the total thickness is from about 1% to about 15%.

6. The multilayer article of claim 4 , wherein the multilayer article is a multilayer film.

7. The multilayer article according to claim 3 , having a structure T/Ad/E/Ad/T or T/T/Ad/E/Ad/T/T.

8. The multilayer article of claim 3 , wherein the total thickness of the multilayer article is from 100 μm to about 400 μm, the thickness of each outer layer T is from about 25 μm to about 200 μm, and the thickness ratio of the core layer E to the total thickness is from about 1% to about 15%.

9. The multilayer article of claim 7 , wherein the total thickness of the multilayer article is from 100 μm to about 400 μm, the thickness of each outer layer T is from about 25 μm to about 200 μm, and the thickness ratio of the core layer E to the total thickness is from about 1% to about 15%.

10. The multilayer article of claim 7 , wherein the multilayer article is a multilayer film.

11. The multilayer article of claim 3 , wherein the multilayer article is a multilayer film.

12. A storage bag for agricultural products comprising at least one layer of the EVOH resin composition of claim 1 .

13. The storage bag of claim 12 , comprising:
(i) a core layer (E) of the EVOH resin composition,
(ii) an outer layer (T) obtained from a polyolefin resin, and
(iii) an adhesive layer (Ad) between the core layer and the outer layer.

14. The storage bag of claim 13 , comprising two outer layers, and an adhesive layer between each outer layer and a core layer.

15. The storage bag of claim 13 , having a structure T/Ad/E/Ad/T or T/T/Ad/E/Ad/T/T.

16. A method of storing a bulk amount of grain comprising: filling a storage bag with said bulk amount of grain then sealing the so filled storage bag, wherein the storage bag is as set forth in claim 12 .

Assignees

• Kuraray Co

Inventors

• Chow Edgard
• Torres Astrid
• Hirose Wataru

Classifications

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B65D77/00

  Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags · CPC title

• B32B2410/00

  Agriculture-related articles · CPC title