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Ethylene-vinyl alcohol resin composition, multilayer structure, multilayer sheet, container, and packaging material

一种树脂组合物、乙烯醇的技术，应用在运输和包装、合成树脂层状产品、包装等方向，能够解决树脂组合物耐蒸煮性外观不良、无法实现降低效果等问题，达到连续制造运转时间延长、耐蒸煮性优异、外观性优异的效果

Active Publication Date: 2015-02-11
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is considered that the resulting EVOH-containing resin composition cannot achieve the described reduction effect
[0009] As mentioned above, it is difficult to improve both the retort resistance of the resin composition and the poor appearance caused by scorch during long-term operation.

Method used

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  • Ethylene-vinyl alcohol resin composition, multilayer structure, multilayer sheet, container, and packaging material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0159] The following examples illustrate the present invention in detail, but the present invention is not limited by these examples. It should be noted that each quantification in this example was carried out by the following method.

[0160] [Ethylene content and degree of saponification of EVOH(A)]

[0161] Using a nuclear magnetic resonance apparatus ("JNM-GX-500 type", manufactured by JEOL Ltd.), DMSO-d 6 As a measurement solvent, by 1 Calculated by H-NMR.

[0162] [Quantification of unsaturated aldehyde (D)]

[0163] Add 50 mL of 1,1,1,3,3,3-hexafluoroisopropanol (HFIP), 11.5 mL of acetic acid and 8 mL of ion-exchange water to prepare a DNPH solution. 1 g of the measurement particles was added to 20 mL of the DNPH solution, and stirred at 35° C. for 1 hour to dissolve. Acetonitrile was added to the solution to separate out and precipitate the resin components, and then filtered, and the resulting solution was concentrated to obtain an extraction sample. The unsatu...

Synthetic example 1

[0169] Using a 250 L pressurized reaction tank, polymerization was carried out under the following conditions to synthesize an ethylene-vinyl acetate copolymer. the

[0170] (addition amount)

[0171] Vinyl acetate: 83.0kg

[0172] Methanol: 17.4kg

[0173] 2,2'-azobisisobutyronitrile: 66.4g

[0174] (aggregation condition)

[0175] Polymerization temperature: 60 ℃

[0176] Polymerization tank ethylene pressure: 3.9MPa

[0177] Polymerization time: 3.5 hours.

[0178] The polymerization rate of vinyl acetate in the above polymerization was 36%. Sorbic acid is added to the resulting copolymerization reaction solution, and then supplied to a displacement column (purchase column), and methanol vapor is introduced from the lower part of the column to remove unreacted vinyl acetate from the top of the column to obtain ethylene-vinyl acetate copolymerization 41 mass % methanol solution of the compound. The ethylene content of this ethylene-vinyl acetate copolymer was 32 mol...

Synthetic example 2

[0181] During the above-mentioned polymerization, crotonaldehyde was supplied so as to contain 0.5 ppm with respect to EVOH (A), and polymerization, saponification, granulation, and washing were carried out in the same manner as in Synthesis Example 1 to obtain granules. The saponification degree of the obtained EVOH (A) was 99.95 mol%.

[0182]

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Abstract

The purpose of the present invention is to provide a resin composition exhibiting excellent retort resistance and property to inhibit burning in an operation lasting a long period of time. The present invention is a resin composition containing an ethylene-vinyl alcohol copolymer (A) having an ethylene content between 20 and 60 mol%, a polyamide resin (B), a carboxylic acid metal salt (C), and an unsaturated aldehyde (D), wherein the mass ratio of the ethylene-vinyl alcohol copolymer (A) relative to the polyamide resin (B) is between 60 / 40 and 95 / 5 when A / B, the content of the carboxylic acid metal salt (C) relative to the resin content is between 1 and 500 ppm in terms of metal element, and the content of the unsaturated aldehyde (D) relative to the resin content is between 0.05 and 50 ppm.

Description

technical field [0001] The present invention relates to a resin composition containing ethylene-vinyl alcohol copolymer, polyamide resin, carboxylate metal salt and unsaturated aldehyde, a multilayer structure and a multilayer sheet using the resin composition, and a multilayer sheet using the material containers and packaging materials. Background technique [0002] Ethylene-vinyl alcohol copolymer (hereafter sometimes abbreviated as "EVOH") is a useful polymer material with excellent barrier properties such as oxygen and other gases, oil resistance, non-static properties, and mechanical strength, and can be molded into films and sheets , containers, packaging materials, etc., are widely used as various packaging materials. In particular, it is known that a laminate comprising an EVOH layer and another thermoplastic resin layer can be used as a packaging material for retort sterilization or retort sterilization of foods. [0003] However, when used in the generally used h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04B29C51/10B32B27/28B32B27/34C08K5/07C08K5/098C08L77/00
CPCB32B27/34C08K5/07B32B27/08C08K5/098B32B27/32C08L29/04B32B27/306B32B2274/00B32B2439/00B29K2995/0067B29K2995/0069B29C49/04B29C49/22C08L77/00Y10T428/1383Y10T428/31725A23L3/10B32B2439/70C08L29/06
Inventor 中泽省吾河合宏
Owner KURARAY CO LTD
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