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Method for producing ethylene-vinyl ester copolymer, and ethylene-vinyl ester copolymer saponification product

A manufacturing method and vinyl ester-based technology are applied in the manufacturing field of ethylene-vinyl ester-based copolymers, which can solve the problems of reduced thermal efficiency, blocked conveying pipes, and the like, and achieve the effect of fewer fish eyes

Active Publication Date: 2016-08-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the polymerization product adheres to and accumulates on the walls of production tanks, storage tanks, distillation towers, and transfer pipes, thereby reducing thermal efficiency or clogging transfer pipes.

Method used

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  • Method for producing ethylene-vinyl ester copolymer, and ethylene-vinyl ester copolymer saponification product
  • Method for producing ethylene-vinyl ester copolymer, and ethylene-vinyl ester copolymer saponification product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] [Adjustment of oxygen concentration in vinyl ester monomer during storage]

[0104] Vinyl acetate was previously distilled and purified, and the oxygen concentration was adjusted to 0 to 1 ppm. Furthermore, the oxygen concentration of vinyl acetate was adjusted to 3 ppm by injecting a mixed gas of air:nitrogen=1:10 at the same time when the vinyl acetate was put into the storage tank. Moreover, the inside of a system was adjusted to 6 kPa, and this vinyl acetate was stored at 30 degreeC.

[0105] In addition, the oxygen concentration of vinyl acetate was measured using gas chromatography.

[0106] [Adjustment of Oxygen Concentration in Vinyl Ester-Based Monomer during Polymerization]

[0107] The oxygen concentration of vinyl acetate was adjusted to 1 ppm by nitrogen bubbling with respect to vinyl acetate adjusted to an oxygen concentration of 3 ppm.

[0108] In addition, the oxygen concentration of vinyl acetate was measured using gas chromatography.

[0109] [Prod...

Embodiment 2

[0130] Except having made the oxygen concentration of vinyl acetate at the time of storage in Example 1 into 5 ppm, it carried out similarly to Example 1, produced the EVOH resin film, and evaluated it similarly.

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Abstract

The present invention provides: an ethylene-vinyl ester copolymer saponification product from which a film having few fisheyes can be produced; and a method for producing an ethylene-vinyl ester copolymer which is a precursor of the ethylene-vinyl ester copolymer saponification product. In the production of an ethylene-vinyl ester copolymer, the oxygen concentration in a vinyl ester monomer used is adjusted to 2 to 8 ppm during storage and / or transportation and is adjusted to less than 2 ppm during polymerization.

Description

technical field [0001] The present invention relates to a method for producing an ethylene-vinyl ester-based copolymer, and more specifically, to an ethylene-vinyl ester-based copolymer that can obtain a film with fewer fish eyes when it is saponified to form a saponified ethylene-vinyl ester-based copolymer. manufacturing method of the object. Background technique [0002] The ethylene-vinyl ester copolymer saponification product (hereinafter, sometimes referred to as "EVOH resin") has very strong intermolecular force due to hydrogen bonds between hydroxyl groups present in the side chains of the polymer. Therefore, since the crystallinity is high and the intermolecular force is high even in the amorphous part, it is difficult for gas molecules and the like to pass through the EVOH resin, and excellent gas barrier properties are exhibited. [0003] EVOH resin is produced by saponifying an ethylene-vinyl ester-based copolymer obtained by copolymerizing ethylene and a vinyl ...

Claims

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Application Information

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IPC IPC(8): C08F218/04C08F8/12C08F210/02C08F216/06
CPCC08F210/02C08F216/06C08F218/04C08F8/12C08F218/08C08J5/18C08J2329/04
Inventor 长尾善春福山秀一山田耕司吉田友则
Owner MITSUBISHI CHEM CORP