Oxygen-absorbing resin composition

Patent metadata

Field	Value
Publication number	US-9782747-B2
Application number	US-201515324308-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Jul 15, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An oxygen-absorbing composition of the present invention contains: a gas barrier resin (A) having an oxygen transmission rate of 500 mL·20 μm/(m 2 ·day·atm) or less as measured at 20° C. and 65% RH; a thermoplastic resin (B) including repeating units represented by General Formula (I) below

(where X is a methylene group or an oxygen atom, R 1 is an alkenylene group having 3 to 12 carbon atoms, and n is an integer of 5 to 5000); at least one type of metal salt (C) selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt, and a cobalt salt; and a bifunctional processing stabilizer (D) that is a compound having an acrylate structure and a hindered phenol structure in a same molecule. The oxygen-absorbing resin composition of the present invention performs excellent oxygen-absorbing properties, and enables to reduce generation of an unpleasant odor caused by decomposition of the oxygen-absorbing composition during oxygen absorption.

First claim

The invention claimed is:

1. An oxygen-absorbing resin composition, comprising:
a gas barrier resin (A) having an oxygen transmission rate of 500 mL·20 μm/(m 2 ·day·atm) or less as measured at 20° C. and 65% RH;
a thermoplastic resin (B) comprising repeating units represented by Formula (I):

at least one type of metal salt (C) selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt, and a cobalt salt; and
a bifunctional processing stabilizer (D) that is a compound having an acrylate structure and a hindered phenol structure in a same molecule,
wherein:
X is a methylene group or an oxygen atom;
R 1 is an alkenylene group having 3 to 12 carbon atoms; and
n is an integer of 5 to 5000.

2. The oxygen-absorbing resin composition of claim 1 , wherein the thermoplastic resin (B) comprises repeating units represented by formula (II):

wherein: (where
R 2 is an alkenylene group having 3 to 9 carbon atoms; and
n is an integer of 5 to 5000.

3. The oxygen-absorbing resin composition of claim 1 , wherein the thermoplastic resin (B) comprises repeating units represented by formula (III):

wherein n is an integer of 10 to 5000.

4. The oxygen-absorbing resin composition of claim 3 , wherein the thermoplastic resin (B) is a resin obtained through ring-opening metathesis polymerization of dicyclopentadiene in the presence of a tungsten compound.

5. The oxygen-absorbing resin composition of claim 1 , wherein a ratio of the bifunctional processing stabilizer (D) is 500 to 20000 ppm based on a mass of the thermoplastic resin (B).

6. The oxygen-absorbing resin composition of claim 1 , wherein:
a content of the gas barrier resin (A) is 70 to 99% by mass; and
a content of the thermoplastic resin (B) is 30 to 1% by mass, based on a total mass of the gas barrier resin (A) and the thermoplastic resin (B).

7. The oxygen-absorbing resin composition of claim 1 , wherein a ratio of the metal salt (C) is 50 to 1000 ppm in terms of metal atoms based on a total mass of the gas barrier resin (A) and the thermoplastic resin (B).

8. The oxygen-absorbing resin composition of claim 1 , wherein the gas barrier resin (A) is an ethylene-vinyl alcohol copolymer at least having an ethylene unit content of 5 to 60 mol %, and having a saponification degree of 90 mol % or more.

9. The oxygen-absorbing resin composition of claim 1 , further comprising a phenolic primary antioxidant (E).

10. The oxygen-absorbing resin composition of claim 9 , wherein a ratio of the phenolic primary antioxidant (E) is 50 to 2000 ppm based on a mass of the thermoplastic resin (B).

11. A multilayer structure, comprising a layer made of the oxygen-absorbing resin composition of claim 1 .

12. A molded product made of a multilayer structure comprising a layer made of the oxygen-absorbing resin composition of claim 1 .

Assignees

• Kuraray Co

Inventors

• Hirose Wataru

Classifications

• C08K5/134

  Phenols containing ester groups · CPC title

• C08G2261/3321

  derived from cyclopentene · CPC title

• C08G61/08

  of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring · CPC title

• C08K2201/012

  Additives improving oxygen scavenging properties · CPC title

• C08L2201/14

  Gas barrier composition · CPC title