Resin composition, its production method and multilayer structure

A technology of resin composition and manufacturing method, applied in synthetic resin layered products, chemical instruments and methods, layered products, etc., can solve the problems of reduced appearance characteristics, prone to coloring, thermal degradation, etc. Adhesion, good appearance, excellent long-term processability

Active Publication Date: 2020-10-09
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when metal ions are contained in the EVOH composition, coloring tends to occur and the appearance of the molded product deteriorates
In addition, in sheet molding, when the trimmed and removed sheet end (left edge) is recovered and reused, EVOH undergoes thermal degradation, gel and particles are generated, and the appearance of the molded product deteriorates.
Furthermore, when used under high temperature conditions for a long time, the appearance characteristics will be reduced due to coloring such as yellowing

Method used

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  • Resin composition, its production method and multilayer structure
  • Resin composition, its production method and multilayer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0149] Hereinafter, the present invention will be further described in detail through examples. In Examples and Comparative Examples described below, analysis and evaluation were performed by the methods shown below.

[0150] (1) Determination of moisture content of water-containing EVOH pellets

[0151] Using a halogen moisture analysis device, under the conditions of a drying temperature of 180° C., a drying time of 20 minutes, and a sample weight of 10 g, the moisture content of the water-containing EVOH pellets was measured by a heating and dry weight measurement method. The water content of hydrous EVOH shown below is mass % on the basis of dry EVOH.

[0152] (2) Ethylene unit content and saponification degree of EVOH (A)

[0153] Dried EVOH pellets were dissolved in dimethyl sulfoxide (DMSO)-d containing tetramethylsilane as an internal standard and trifluoroacetic acid (TFA) as an additive 6 , use a 500MHz 1 H-NMR was measured at 80° C., and the ethylene unit conten...

Synthetic example 1

[0223] In synthetic example 1, the feed intake of vinyl acetate and methyl alcohol during the polymerization of EVAc is changed to 85.2kg, 32.3kg respectively, and reaction tank pressure is changed to 2.9MPa, and initiator solution (2.5g / L concentration of AMV (methanol solution) was changed to 310 mL at the start of polymerization, and the continuous addition amount of the initiator solution was changed to 950 mL / hr, except that, by the same operation as Synthesis Example 1, a methanol solution of EVAc was obtained. The reaction time during the polymerization reaction was 5 hours, and the polymerization rate was 40%.

[0224] Next, saponification and washing were performed in the same manner as in Synthesis Example 1, except that the addition amount of the alkali solution was changed to 31.1 L and the addition amount of acetic acid at the time of neutralization was changed to 3.7 kg, to obtain a roughly dried EVOH product.

[0225] Further, the water / methanol mass ratio of th...

Embodiment 2~16 and comparative example 1~8

[0243]Dry EVOH pellets were obtained in the same manner as in Example 1 except that the components and concentrations blended in the aqueous solution were changed as shown in Table 1. Table 2 shows the results of the analysis and evaluation described above for each of the obtained pellets.

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Abstract

The present invention is a resin composition comprising: EVOH (A), component (B) containing at least any one of nitric acid and nitrate ions, and metal ions (C), wherein the content Bm of the component (B) is 0.5 μmol / g to 100 μmol / g, the content Cm of the metal ion (C) is 2 μmol / g to 120 μmol / g, and the content Bm of the component (B) is equal to the metal ion (C) )’s content Cm and its average valence Cv satisfy the following formula (1), and when the component (D) containing at least any one of carboxylic acid and carboxylate ion is contained, the aforementioned Bm, the aforementioned Cm, the aforementioned Cv, The content Dm of the aforementioned component (D) and the average valence Dv thereof satisfy the following formula (2). (Cv×Cm) / Bm≥1.0・・・(1) ((Cv×Cm)‑Bm) / (Dv×Dm)≥0.2・・・(2).

Description

technical field [0001] The present invention relates to a resin composition, a method for producing the same, and a multilayer structure having a layer obtained from the resin composition. Background technique [0002] Ethylene-vinyl alcohol copolymers (hereinafter abbreviated as EVOH) are widely used as various packaging materials such as films, sheets, and containers due to their excellent oxygen shielding properties and the like. These packaging materials are usually molded by melt molding. Therefore, for EVOH, appearance characteristics (excellent transparency, less coloring such as yellowing, and no gel and particle generation), long-term processability (long-term molding Physical properties such as medium viscosity do not change drastically, and there are no fish eyes, streaks, etc.). In addition, packaging materials are mostly used as multilayer structures. Therefore, in order to improve the interlayer adhesiveness of the multilayer structure, metal ions may be cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04B32B27/28C08K3/28C08K3/32C08K3/38C08K5/09
CPCB32B27/28C08K3/28C08K3/32C08K3/38C08K5/09C08L29/04
Inventor 吉田健太郎
Owner KURARAY CO LTD
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