IP Library › Granted Patent US 12,473,421
Granted Patent B2
US 12,473,421 · App. 16/713,624 · Granted Nov 18, 2025

Ethylene-vinyl alcohol copolymer composition, pellets, and multilayer structure

Inventors: Shintaro Usui (Tokyo, JP); Daichi Nishimura (Tokyo, JP); Minako Ikeshita (Tokyo, JP)
Assignee: MITSUBISHI CHEMICAL CORPORATION
C08K3/32B29B9/12B32B7/12B32B27/08B32B27/306C08K5/09B29K2023/086B29K2105/0044C08K2003/328
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Quick Facts
Patent No.
US 12,473,421
App. No.
16/713,624
Granted
Nov 18, 2025
Kind
B2
Abstract

An ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer; (B) a compound containing a conjugated polyene structure; and (C) an iron compound; wherein the iron compound (C) is present in an amount of 0.01 to 20 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition is less susceptible to coloration and is excellent in heat stability.

Claims (15)

1 . An ethylene-vinyl alcohol copolymer composition comprising:

(A) an ethylene-vinyl alcohol copolymer;

(B) a compound containing a conjugated polyene structure; and

(C) an iron compound;

wherein the ethylene-vinyl alcohol copolymer (A) is present in an amount that is not less than 70 wt. % based on a total weight of the ethylene-vinyl alcohol copolymer composition,

wherein the compound containing a conjugated polyene structure has a molecular weight of 30 to 500,

wherein the conjugated polyene structure-containing compound (B) is present in an amount of 30 to 1000 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition,

wherein the iron compound (C) is an iron salt selected from the group consisting of iron phosphates, iron sulfates, and iron carboxylates,

wherein the iron compound (C) is present in an amount of 0.01 to 20 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition, and

wherein a weight ratio of the amount of the conjugated polyene structure-containing compound (B) to the amount of the iron compound (C) on a metal basis is (conjugated polyene structure-containing compound (B))/(iron compound (C))=1 to 50,000.

2 . The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the weight ratio of the amount of the conjugated polyene structure-containing compound (B) to the amount of the iron compound (C) on a metal basis is (conjugated polyene structure-containing compound (B))/(iron compound (C))=1 to 25,000.

3 . Pellets comprising the ethylene-vinyl alcohol copolymer composition according to claim 1 .

4 . A multilayer structure comprising a layer which comprises the ethylene-vinyl alcohol copolymer composition according to claim 1 .

5 . The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the conjugated polyene structure-containing compound (B) is present in an amount of 30 to 500 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition.

6 . The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the iron compound (C) comprises iron (III) phosphate n-hydrate.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 13, 2019
From: USUI, SHINTARO; NISHIMURA, DAICHI; IKESHITA, MINAKO
To: MITSUBISHI CHEMICAL CORPORATION
Reel/Frame 051279/0461 →
Priority Claims (1)
JP 2017-124968 · Jun 27, 2017 · national
Continuity (2)
Continuation PCTJP2018024308 · Jun 27, 2018
Related Publication 20200115522A1 · Apr 16, 2020
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