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Process for producing ethylene/vinyl alcohol copolymer resin, ethylene/vinyl alcohol copolymer resin, and multilayer structure

A vinyl alcohol copolymer and vinyl ester copolymer technology, which is applied in the field of multilayer structures, can solve the problems such as the easy occurrence of gluing and quality deterioration of granular materials, and achieve the effects of excellent appearance characteristics, reduced yellowing, and suppression of quality deterioration.

Active Publication Date: 2013-12-11
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when heating at a high temperature in order to shorten the drying time, the occurrence of coloring or the cause of white spots during molding occurs, and the quality deteriorates.
In order to solve these problems, the use of the above-mentioned microwaves has been proposed, but in this case, it is difficult to say that it is an effective solution because the particles tend to stick together due to melting.

Method used

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  • Process for producing ethylene/vinyl alcohol copolymer resin, ethylene/vinyl alcohol copolymer resin, and multilayer structure
  • Process for producing ethylene/vinyl alcohol copolymer resin, ethylene/vinyl alcohol copolymer resin, and multilayer structure
  • Process for producing ethylene/vinyl alcohol copolymer resin, ethylene/vinyl alcohol copolymer resin, and multilayer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2～1-7

[0248] EVOH particles of Examples 1-2 to 1-7 were obtained in the same manner as in Example 1-1, except that the resin temperature and light intensity of the EVOH particles during infrared irradiation were as shown in Table 1.

Embodiment 1-8～1-11

[0250] EVOH particles of Examples 1-8 to 1-11 were obtained in the same manner as in Example 1-1 except that the resin temperature and infrared irradiation time for the EVOH particles during infrared irradiation were as shown in Table 1.

Embodiment 1-12

[0252] In Example 1-1, the EVOH pellets dried at 80° C. for 3 hours were taken out and the moisture content was measured. As a result, the moisture content was 10% by mass. The EVOH particles were irradiated with infrared rays in the same manner as in Example 1. Next, drying was performed at 120° C. for 24 hours by the same method as in Example 1-1 to obtain EVOH particles.

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Abstract

A purpose of the present invention is to provide: a process for producing an EVOH resin which has sufficient durability for long-run melt molding and is reduced in discoloration such as yellowing; an EVOH resin obtained by the production process; and a multilayer structure obtained from the resin. Another purpose is to provide a process for ethylene / vinyl alcohol copolymer resin production in which drying can be efficiently conducted while inhibiting quality deterioration. The former process for producing an ethylene / vinyl alcohol copolymer resin includes an infrared irradiation step in which either an ethylene / vinyl alcohol copolymer or an ethylene / vinyl ester copolymer that is a precursor for the ethylene / vinyl alcohol copolymer is irradiated with infrared rays.

Description

technical field [0001] The present invention relates to a method for producing an ethylene-vinyl alcohol copolymer resin, an ethylene-vinyl alcohol copolymer resin obtained by the production method, and a multilayer structure having a layer containing the resin. Background technique [0002] Ethylene-vinyl alcohol copolymers (hereinafter sometimes abbreviated as "EVOH") are excellent in oxygen barrier properties, transparency, oil resistance, static electricity, mechanical strength, etc., so they are used as various packaging materials such as films, sheets, containers, etc. being widely used. [0003] These films and the like are usually formed by a melt forming method. Therefore, EVOH is required to have excellent appearance characteristics during melt molding (it is possible to obtain molded products with excellent appearance without occurrence of gel, pitting, yellowing, etc.), durability (even after long-term molding) Physical properties such as medium viscosity do no...

Claims

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Application Information

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IPC IPC(8): C08J3/28B29B13/06C08J7/00
CPCB29B7/007B29B7/38B29B7/726B29B7/90B29B9/065B29B9/12B29B13/065B29B13/08B29C2035/0822C08J3/28C08J2323/08
Inventor 坪井俊雄R.乔伊特R.阿姆斯特龙山本喜雄中野贤治池田和隆
Owner KURARAY CO LTD
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