Resin composition and applications thereof

Patent metadata

Field	Value
Publication number	US-10995189-B2
Application number	US-201716332586-A
Country	US
Kind code	B2
Filing date	Sep 13, 2017
Priority date	Sep 13, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A resin composition contains an ethylene-vinyl alcohol copolymer (A) in which an ethylene unit content is from 10 to 60 mol %, a hindered amine-based compound (B) having a 2,2,6,6-tetraalkylpiperidine ring structure and having an alkoxy group bonded to a nitrogen atom in the structure, and a hindered phenol-based compound (C) having an ester bond or an amide bond. The resin composition contains 0.1 to 5 parts by mass of the hindered amine-based compound (B) and 0.2 to 5 parts by mass of the hindered phenol-based compound (C) with respect to 100 parts by mass of the ethylene-vinyl alcohol copolymer (A), and a mass ratio (C)/(B) is from 0.2 to 3.6.

First claim

The invention claimed is:

1. A resin composition comprising:
an ethylene-vinyl alcohol copolymer (A) in which an ethylene unit content is from 10 to 60 mol %;
a hindered amine-based compound (B) having a 2,2,6,6-tetraalkylpiperidine ring structure and having an alkoxy group bonded to a nitrogen atom in the structure; and
a hindered phenol-based compound (C) having an ester bond or an amide bond,
wherein the resin composition comprises from 0.1 to 5 parts by mass of the hindered amine-based compound (B) and from 0.2 to 5 parts by mass of the hindered phenol-based compound (C), based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A), and
a mass ratio of the hindered phenol-based compound (C) to the hindered amine-based compound (B), (C)/(B), is from 0.2 to 3.6.

2. The resin composition according to claim 1 , wherein the hindered amine-based compound (B) has a molecular weight of at least 1000.

3. The resin composition according to claim 1 , wherein the hindered phenol-based compound (C) has an amide bond.

4. An agricultural film comprising a gas barrier layer composed of the resin composition of claim 1 .

5. The agricultural film according to claim 4 , wherein the film is a soil fumigation film, a silage film, or a greenhouse film.

6. A grain storage bag comprising a gas barrier layer composed of the resin composition of claim 1 .

7. A geomembrane comprising a gas barrier layer composed of the resin composition of claim 1 .

8. A pipe comprising a gas barrier layer composed of the resin composition of claim 1 .

9. The pipe according to claim 8 , wherein the pipe is a hot water circulation pipe or a fuel pipe.

10. A master batch comprising:
an ethylene-vinyl alcohol copolymer (A) in which an ethylene unit content is from 10 to 60 mol %;
a hindered amine-based compound (B) having a 2,2,6,6-tetraalkylpiperidine ring structure and having an alkoxy group bonded to a nitrogen atom in the structure; and
a hindered phenol-based compound (C) having an ester bond or an amide bond,
wherein the master batch comprises from 2 to 20 parts by mass of the hindered amine-based compound (B) and from 1 to 14 parts by mass of the hindered phenol-based compound (C), based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A), and
a mass ratio of the hindered phenol-based compound (C) to the hindered amine-based compounds (B), (C)/(B), is from 0.2 to 3.6.

11. A method of manufacturing a resin composition, the method comprising:
obtaining a master batch in advance by melting and kneading 100 parts by mass of an ethylene-vinyl alcohol copolymer (A) in which an ethylene unit content is from 10 to 60 mol %, from 2 to 20 parts by mass of a hindered amine-based compound (B) having a 2,2,6,6-tetraalkylpiperidine ring structure and having an alkoxy group bonded to a nitrogen atom in the structure, and from 1 to 14 parts by mass of a hindered phenol-based compound (C) having an ester bond or an amide bond; and
melting and kneading the obtained master batch and additional ethylene-vinyl alcohol copolymer (A),
wherein a mass ratio of the hindered phenol-based compound (C) to the hindered amine-based compound (B), (C)/(B), is from 0.2 to 3.6.

12. The resin composition according to claim 1 , wherein the mass ratio of (C)/(B) is from 0.3 to 1.1.

13. The resin composition according to claim 1 , wherein resins contained in the resin composition consist essentially of the ethylene vinyl alcohol copolymer (A).

Assignees

• Kuraray Co

Inventors

• Chow Edgard
• Yoshida Kentaro
• Hasegawa Tatsuya

Classifications

• C08L29/04 Primary

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• A01G13/20

  Protective coverings for plants · CPC title

• A01G9/14

  Greenhouses · CPC title

• C08K5/13

  Phenols; Phenolates · CPC title

• C08J3/22

  using masterbatch techniques · CPC title