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Problems solved by technology
As such, in order to use the EVOH copolymer, an adhesive layer that is not required to improve the function as a packaging material becomes necessary. Therefore, not only the layer structure becomes complicated, but also an extruder for forming the adhesive layer is required. , leading to an increase in production costs, etc.
Method used
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Embodiment 1）
[0141] Using a Labo Plastomill film forming machine, three types of three-layer sheets of oxygen barrier layer (70 μm) adhesive intermediate layer (100 μm) / polypropylene layer (70 μm) were produced at a molding temperature of 230 ° C, and the oxygen barrier layer and Peel strength between adhesive interlayers.
[0142] The resins used are as follows: oxygen barrier layer: the above oxygen-absorbing resin composition; polypropylene layer: NOBLEN FH1016 (manufactured by Sumitomo Chemical Co., Ltd.); adhesive intermediate layer: a dry blend of the following resins.
[0143] EVOH copolymer resin for oxygen barrier:
[0144] SP521B manufactured by KURARAY CO.,LTD.
[0145] Ethylene content: about 27 mol%
[0146] Mixing ratio: 58.5% by weight
[0147] MAMO resin:
[0148] High MFR ingredients (hereinafter referred to as AD1):
[0149] DuPont Fusabond P613
[0150] Acid modification rate: 0.4%
[0151] MFR: 120g / 10 minutes
[0152] Compounding ratio: 9.8% by weight
[0153]...
Embodiment 2）
[0166] The same test as in Example 1 was performed except that the compounding ratio of the adhesive intermediate layer was 60% by weight of the EVOH copolymer for oxygen barrier, 10% by weight of AD1, and 30% by weight of AD2.
[0167] As a result, although flow unevenness slightly occurred during film formation, film formation was possible without any problem, and high adhesive strength could be expressed.
Embodiment 3）
[0169] The same test as in Example 1 was performed except that the compounding ratio of the adhesive intermediate layer was 70% by weight of the EVOH copolymer for oxygen barrier, 15% by weight of AD1, and 15% by weight of AD2.
[0170] As a result, although flow unevenness slightly occurred during film formation, film formation was possible without any problem, and high adhesive strength could be expressed.
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Abstract
The present invention provides a multilayer plastic container that does not require an extra adhesive-agent layer, is capable of sufficiently exerting the excellent oxygen barrier characteristics of ethylene-vinyl alcohol copolymers, is capable of being used effectively even when polyolefin-based resins are used as the inner and outer layers, and allows extremely easy setting of conditions for satisfying certain properties. An adhesive intermediate layer that is provided adjacent to an oxygen barrier layer containing an ethylene-vinyl alcohol copolymer as a matrix and that consists of a blend of an ethylene-vinyl alcohol copolymer and a maleic anhydride-modified olefin resin, is characterized by: containing said ethylene-vinyl alcohol copolymer and said maleic anhydride-modified olefin resin at a weight ratio of 4:6 to 8:2; and containing, as said maleic anhydride-modified olefin resin, a high MFR component in which the MFR at 190 DEG C is 100-500 g / 10 min. and a low MFR component in which the MFR is 2-90 g / 10 min.
Description
technical field [0001] The present invention relates to a multi-layer plastic container, which is provided with a blend of ethylene-vinyl alcohol copolymer (hereinafter sometimes referred to as EVOH copolymer) and maleic anhydride modified olefin resin (hereinafter sometimes referred to as MAMO resin) layer (adhesive interlayer) as an interlayer, especially in relation to multilayer plastic containers suitable for packaging purposes. Background technique [0002] Polyolefin-based resins such as polyethylene and polypropylene, and polyester resins represented by polyethylene terephthalate have excellent moldability, transparency, mechanical strength, and chemical resistance. It is used as packaging materials such as films, sheets, bottles, etc. in various fields. [0003] Incidentally, EVOH copolymers (saponified products of ethylene-vinyl acetate copolymers with a degree of saponification close to 100%) are known to be resins excellent in oxygen barrier properties, and espe...
Claims
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