Ethylene-vinyl alcohol copolymer composition, ethylene-vinyl alcohol copolymer composition for melt forming, pellets, and multilayer structure

Patent metadata

Field	Value
Publication number	US-12152124-B2
Application number	US-201916695939-A
Country	US
Kind code	B2
Filing date	Nov 26, 2019
Priority date	Jun 27, 2017
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

An ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer; (B) a long Periodic Table 4th-period d-block metal compound; and (C) an iron compound; wherein the iron compound (C) is present in an amount of 0.01 to 5 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition exhibits improved impact resistance and heat stability (color tone deterioration-suppressing effect and coloration-suppressing effect).

First claim

The invention claimed is:

1. An ethylene-vinyl alcohol copolymer composition comprising:
(A) an ethylene-vinyl alcohol copolymer;
(B) a compound of a long Periodic Table 4th-period d-block metal; and
(C) an iron compound;
wherein the ethylene-vinyl alcohol copolymer (A) comprises an ethylene structural unit content of 20 to 60 mol %;
wherein the compound of a long Periodic Table 4th-period d-block metal (B) is a zinc organic salt;
wherein the iron compound (C) is present in an amount of 0.01 to 5 ppm on a metal basis based on a weight of the ethylene-vinyl alcohol copolymer composition; and

wherein a weight ratio of the amount of the long Periodic Table 4th-period d-block metal compound (B) on a metal basis to the amount of the iron compound (C) on a metal basis is 30 to 5,000.

2. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the long Periodic Table 4th-period d-block metal compound (B) is present in an amount of 0.1 to 500 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition.

3. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein a weight ratio of the amount of the long Periodic Table 4th-period d-block metal compound (B) on a metal basis to the amount of the iron compound (C) on a metal basis is 0.02 to 50,000.

4. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the long Periodic Table 4th-period d-block metal compound (B) is a zinc carboxylate.

5. An ethylene-vinyl alcohol copolymer composition for melt forming, which comprises the ethylene-vinyl alcohol copolymer composition according to claim 1 .

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

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

8. The ethylene-vinyl alcohol copolymer composition according to claim 1 ,
wherein the long Periodic Table 4th-period d-block metal compound (B) is a zinc carboxylate; and
wherein anion moieties of the zinc carboxylate each have 2 to 25 carbons.

9. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein a weight ratio of the amount of the long Periodic Table 4th-period d-block metal compound (B) on a metal basis to the amount of the iron compound (C) on a metal basis is 250 to 50,000.

Assignees

• Mitsubishi Chem Corp

Inventors

• Komuro Ryohei
• USUI Shintaro
• Nishimura Daichi
• Ikeshita Minako

Classifications

• B29B7/726

  Measuring properties of mixture, e.g. temperature or density (B29B7/724 takes precedence) · CPC title

• B29B7/007

  for continuous mixing · CPC title

• B29B9/06

  in the form of filamentary material, e.g. combined with extrusion · CPC title

• C08F6/02

  Neutralisation of the polymerisation mass, e.g. killing the catalyst (short-stopping C08F2/42 ){also removal of catalyst residues} · CPC title

• C08K13/02

  Organic and inorganic ingredients · CPC title