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Ethylene-vinyl alcohol copolymer resin composition and method for producing same

A technology of a resin composition and a manufacturing method, which is applied in the field of ethylene-vinyl alcohol copolymer resin compositions, can solve problems such as color deterioration of EVOH resin compositions, and achieve excellent appearance properties, yellowing inhibition, and excellent appearance properties

Active Publication Date: 2014-03-12
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these EVOH resin compositions, when polyhydric phenols are blended in an amount of about 0.1% by mass or more relative to EVOH in order to obtain the target oxygen absorption effect or decomposition prevention effect, there is a problem that the color tone of the EVOH resin composition deteriorates.

Method used

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  • Ethylene-vinyl alcohol copolymer resin composition and method for producing same
  • Ethylene-vinyl alcohol copolymer resin composition and method for producing same
  • Ethylene-vinyl alcohol copolymer resin composition and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

[0128] In the following examples and comparative examples, the analysis and evaluation of the EVOH resin composition and the like were carried out according to the methods shown below.

[0129] (1) Determination of moisture content of water-containing EVOH particles

[0130] The moisture content of the hydrous EVOH pellets was measured using a halogen moisture content analyzer "HR73" manufactured by Mettler Toledo Co., Ltd. under conditions of a drying temperature of 180° C., a drying time of 20 minutes, and a sample weight of about 10 g. The water content of hydrous EVOH shown below is mass % based on the dry weight of EVOH.

[0131] (2) Ethylene content and saponification degree of EVOH (A)

[0132] The dried EVOH particles were pulverized by freeze pulverization. The obtained pulverized EVOH was sieved with a sieve having a nominal size of 1 m...

Synthetic example 1

[0235] Synthesis of water-containing EVOH particles

[0236] (polymerization of ethylene-vinyl acetate copolymer)

[0237] Charge 85.3 kg of vinyl acetate and 21.6 kg of methanol into a 250 L pressurized reaction tank equipped with a stirrer, nitrogen inlet, ethylene inlet, initiator addition port, and delay (sequential addition) solution addition port, raise the temperature to 60 ° C, and then Nitrogen replacement in the system was carried out by nitrogen bubbling for 60 minutes. Next, ethylene was charged so that the pressure of the reaction tank became 3.7 MPa. As an initiator, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile) (AMV) was dissolved in methanol, and an initiator solution with a concentration of 1.9 g / L was prepared for Nitrogen substitution was performed by bubbling nitrogen gas. The internal temperature of the above-mentioned polymerization tank was adjusted to 60° C., and then 653 mL of the above-mentioned initiator solution was injected to initiate polym...

Synthetic example 2

[0246] Synthesis of water-containing EVOH particles

[0247] In Synthetic Example 1, the loading amounts of vinyl acetate and methanol during the polymerization of the ethylene-vinyl acetate copolymer were changed to 71.1kg and 4.28kg respectively, the pressure of the reaction tank was changed to 6.65MPa, and the initiator solution (AMV In addition, the injection amount at the start of polymerization was changed to 1305mL, the continuous addition amount of the initiator solution was changed to 2145mL / hr, and the inner temperature of the polymerization tank was changed to 55°C. A methanol solution of EVAc from which unreacted vinyl acetate monomer was removed was obtained by the same operation as in Synthesis Example 1. At this time, the polymerization rate was 35%.

[0248] Next, the amount of alkali solution added to 200.0 kg of EVAc in methanol (30 kg of EVAc in the solution) was changed to 49.8 L, and the amount of acetic acid added during neutralization was changed to 6....

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Abstract

The purpose of the present invention is to provide an ethylene-vinyl alcohol copolymer resin composition which has excellent appearance characteristics (particularly being reduced in coloration and hue spots) and is suppressed in occurrence of yellowing and the like during melt molding. The present invention is an ethylene-vinyl alcohol copolymer resin composition, which contains (A) an ethylene-vinyl alcohol copolymer and (B) a compound having an enediol structure, and wherein the molar ratio of the compound (B) relative to the vinyl alcohol unit of the ethylene-vinyl alcohol copolymer (A) is from 2.70*10-9 to 2.70*10-5 (inclusive).

Description

technical field [0001] The present invention relates to an ethylene-vinyl alcohol copolymer resin composition and a production method thereof. Background technique [0002] Ethylene-vinyl alcohol copolymers (hereinafter also referred to as "EVOH") are excellent in oxygen barrier properties, transparency, oil resistance, non-static properties, and mechanical strength, and are widely used as various packaging materials such as films, sheets, and containers. application. [0003] In general, EVOH resin compositions containing EVOH are required to have excellent appearance properties (no coloration such as yellowing, no unevenness in color tone, etc.). In addition, the above-mentioned films and the like are usually molded by a melt molding method. Therefore, EVOH resin compositions are also required to have excellent appearance characteristics (no gelation, no blocking, no yellowing) and less uneven quality even during melt molding. color change, etc.), long-run (long run) (ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08F8/12C08K5/00
CPCC08F8/12C08K5/1545C08K5/13C08K5/1345C08K5/053C08K5/1535C08K5/09B29B9/06B29B9/12C08L29/04C08L23/0861C08F218/08
Inventor 野中康弘山本喜雄山崎义和
Owner KURARAY CO LTD
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