Ethylene-vinyl alcohol based copolymer resin composition, multilayer structural body and packaging body
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A resin composition, vinyl alcohol technology, used in transportation and packaging, synthetic resin layered products, packaging, etc., can solve problems such as damage, pinhole generation, EVOH layer rupture, etc.
Active Publication Date: 2021-08-06
MITSUBISHI CHEM CORP
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[0003]
As mentioned above, EVOH has excellent gas barrier properties, but on the contrary, it is rich in hydroxyl groups in the molecular chain and has a high degre
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[1124] Hereinafter, the present invention will be described more concretely with examples and comparative examples shown in the following tables, but the present invention is not limited to the following examples unless the gist is exceeded. In addition, in an example, "part" means a weight basis.
[1125] >
Embodiment I-1
[1127] 〔Manufacture of EVOH resin composition〕
[1128] As EVOH (A), an ethylene-vinyl alcohol copolymer containing EVOH (a1) [ethylene structural unit content 29 mol%, saponification degree 99.7 mol%, MFR 3.8g / 10min (210°C, load 2160g)] was used as EVOH (A). Sodium acetate (b1) as pellets of EVOH (a1) of acetic acid and / or its salt (B). In addition, stearic acid (c1) was used as the aliphatic carboxylic acid (C), and zinc stearate (d1) was used as the aliphatic carboxylic acid metal salt (D).
[1129] In addition, as the content of each component, 432 ppm of acetic acid in terms of acetate ion was used relative to the total content of EVOH (a1), sodium acetate (b1), stearic acid (c1), and zinc stearate (d1). For sodium (b1), 1.0 ppm of stearic acid in terms of carboxylate ions was used relative to the total content of EVOH (a1), sodium acetate (b1), stearic acid (c1), and zinc stearate (d1) (c1), zinc stearate (d1) at 20 ppm in terms of metal ions relative to the total cont...
Embodiment I-2
[1177] Using stearic acid (c1) at 2.4 ppm in terms of carboxylate ions relative to the total content of EVOH (a1), sodium acetate (b1), stearic acid (c1), and zinc stearate (d1), use Zinc stearate (d1) is 50 ppm in terms of metal ions relative to the total content of EVOH (a1), sodium acetate (b1), stearic acid (c1), and zinc stearate (d1), and other Otherwise, an EVOH resin composition and a multilayer structure were produced in the same manner as in Example I-1. The obtained EVOH resin composition and multilayer structure were evaluated in the same manner as in Example I-1.
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Abstract
Provided is an ethylene-vinyl alcohol based copolymer resin composition which has excellent shock resistance without being combined with a resin other than an ethylene-vinyl alcohol based copolymer, and which has excellent adhesive strength, said resin composition containing an ethylene-vinyl alcohol based copolymer (A), acetic acid and/or a salt thereof (B), an aliphatic carboxylic acid (C) other than the acetic acid, and an aliphatic carboxylic acid metal salt (D) which is a metal salt of the aliphatic carboxlyic acid (C), wherein: the metal species of the alphatic carboxylic acid metal salt (C) is at least one metal selected from the d-block elements of the fourth period of the long-form periodic table; and the amount of each of the acetic acid and/or a salt thereof (B), the aliphatic carboxylic acid (C) and the aliphatic carboxylic acid metal salt (D) fulfills the following formulas (1) (2) on a weight basis. Formula (1): 0.001<=((D) content in terms of metal ions/(B) content in terms of acetic acid ions) <=1.30 Formula (2): 0.11<=((D) content in terms of metal ions/(C) content in terms of carboxylic acid ions) <=100.
Description
technical field [0001] The present invention relates to an ethylene-vinyl alcohol-based copolymer (hereinafter, sometimes referred to as "EVOH") resin composition, and more specifically relates to an EVOH resin composition excellent in impact resistance and also excellent in adhesive strength. Background technique [0002] In EVOH, abundant hydroxyl groups in the molecular chain are firmly hydrogen-bonded to form a crystal part, and the crystal part prevents intrusion of oxygen from the outside, and therefore exhibits excellent gas barrier properties typified by oxygen barrier properties. This EVOH is generally used as an intermediate layer of a resin-laminated laminate, and is used as various packages. [0003] As mentioned above, EVOH has excellent gas barrier properties, but on the contrary, it is rich in hydroxyl groups in the molecular chain and has a high degree of crystallinity. Therefore, it tends to be brittle, and the EVOH layer in the package may be broken due to ...
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