IP Library › Granted Patent US 10,676,605
Granted Patent B2
US 10,676,605 · App. 15/781,300 · Granted Jun 9, 2020

Ethylene-vinyl alcohol copolymer composition, pellets, multilayer structure, and production method for ethylene-vinyl alcohol copolymer composition

Inventors: Nobuaki Sato (Osaka, JP); Koji Yamada (Osaka, JP)
Assignee: MITSUBISHI CHEMICAL CORPORATION
C08L29/04B32B27/306C08K3/11C08L23/08C08K2003/2265C08K2003/2272C08K2003/2275
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Quick Facts
Patent No.
US 10,676,605
App. No.
15/781,300
Granted
Jun 9, 2020
Kind
B2
Abstract

An ethylene-vinyl alcohol copolymer composition can be formed into a product having very few minute fisheyes. The ethylene-vinyl alcohol copolymer composition comprises: an ethylene-vinyl alcohol copolymer; and an iron compound; wherein the ethylene-vinyl alcohol copolymer is a saponification product of an ethylene-vinyl ester copolymer prepared by using an organic compound having a half-life of 10 to 300 minutes at 60° C. as a polymerization initiator; wherein an amount of the iron compound is 0.001 to 2 ppm in terms of a metal by weight of the ethylene-vinyl alcohol copolymer composition.

Claims (14)

1. An ethylene-vinyl alcohol copolymer composition comprising:

an ethylene-vinyl alcohol copolymer; and

an iron compound;

wherein the ethylene-vinyl alcohol copolymer is a saponification product of an ethylene-vinyl ester copolymer prepared by using an organic compound having a half-life of 10 to 300 minutes at 60° C. as a polymerization initiator, and

wherein an amount of the iron compound is 0.001 to 2 ppm in terms of a metal by weight of the ethylene-vinyl alcohol copolymer composition.

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

3. A multilayer structure comprising at least one layer comprising the ethylene-vinyl alcohol copolymer composition according to claim 1 .

4. A production method for producing an ethylene-vinyl alcohol copolymer composition, comprising:

preparing an ethylene-vinyl ester copolymer by using an organic compound as a polymerization initiator;

producing an ethylene-vinyl alcohol copolymer by saponifying the ethylene-vinyl ester copolymer; and

controlling the amount of the iron compound in the ethylene-vinyl alcohol copolymer and producing the ethylene-vinyl alcohol copolymer composition;

thereby producing the ethylene-vinyl alcohol copolymer composition according to claim 1 .

5. The ethylene-vinyl alcohol copolymer composition production method according to claim 4 ,

wherein the controlling the amount of the iron compound in the ethylene-vinyl alcohol copolymer and producing the ethylene-vinyl alcohol copolymer composition comprises bringing the ethylene-vinyl alcohol copolymer into contact with an extraction solvent.

Assignments (2)
MERGER Recorded May 2, 2019
From: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
To: MITSUBISHI CHEMICAL CORPORATION
Reel/Frame 049110/0285 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 4, 2018
From: SATO, NOBUAKI; YAMADA, KOJI
To: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
Reel/Frame 045979/0859 →
Priority Claims (1)
JP 2015-255784 · Dec 28, 2015 · national
Continuity (1)
Related Publication 20180355163A1 · Dec 13, 2018
Cited By (1)
US 12,427,756