Multilayered container and method for producing same

a technology of multi-layer containers and containers, which is applied in the field of multi-layer containers, can solve the problems that only polyester resin-based hollow containers have a sufficient gas barrier property, and achieve the effect of improving oxygen barrier properties and excellent delamination resistan

Pending Publication Date: 2022-04-14
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029]The present invention can provide a multilayer container having an improved oxygen barrier property and excellent delamination resistance and a method for producing the same.

Problems solved by technology

Meanwhile, when a polyester resin is used for bottles, hollow containers composed only of the polyester resin do not always have a sufficient gas barrier property for gas such as carbon dioxide gas and oxygen.

Method used

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  • Multilayered container and method for producing same
  • Multilayered container and method for producing same
  • Multilayered container and method for producing same

Examples

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[0245]The present invention is hereunder more specifically described by reference to the Examples and Comparative Examples, but it should be construed that the present invention is by no means limited to these Examples.

[0246]The thermoplastic polyester resin (X) and the polyamide resin (Y-1) used in the Examples and Comparative Examples are as follows.

[0247][0248]PET (Polyester resin): Polyethylene terephthalate (intrinsic viscosity: 0.83 dL / g), trade name: “BK 2180” manufactured by Mitsubishi Chemical Corporation (melting point 248° C.)

[0249][0250]MXD6 (Polyamide resin): Poly(metaxylylene adipamide) (relative viscosity: 2.7, melting point=240±5° C.), trade name “MX Nylon S6007” manufactured by Mitsubishi Gas Chemical Company

[0251][Method of Measurement and Evaluation]

[0252]

[0253]The position and the thickness of the polyamide layer of the bottles prepared in Examples and Comparative Examples were measured as follows.

[0254]A sample of 1.5 cm×1.5 cm was cut from the bottle at a posit...

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Abstract

A multilayer container having a polyester layer comprising a thermoplastic polyester resin (X) and a polyamide layer comprising a polyamide resin (Y), wherein the polyester layer is an innermost layer and the polyamide layer is an interlayer, and the polyamide resin (Y) comprises a polyamide resin (Y-1) comprising a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 70 mol % or more of the structural unit derived from a diamine being a structural unit derived from xylylenediamine; and 70 mol % or more of the structural unit derived from a dicarboxylic acid being a structural unit derived from an α,ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, and wherein a stretching ratio in a transverse direction (TD) is 2.2 times or more, and a stretching ratio in a machine direction (MD) to the stretching ratio in the transverse direction (TD) (MD/TD) is 0.6 or more and less than 1.0.

Description

TECHNICAL FIELD[0001]The present invention relates to a multilayer container and a method for producing the same.BACKGROUND ART[0002]Polyester resins, which are typically polyethylene terephthalate (PET), have characteristics such as excellent transparency, mechanical property, melt stability and recyclability, and thus at present are widely used as various packaging materials including film, sheet and hollow containers. Meanwhile, when a polyester resin is used for bottles, hollow containers composed only of the polyester resin do not always have a sufficient gas barrier property for gas such as carbon dioxide gas and oxygen.[0003]Thus, researchers have considered multilayer bodies and multilayer containers using a polyester resin as a resin constituting an outer layer and an inner layer and having a barrier layer made of a polyamide resin as an interlayer between the outer layer and the inner layer (PTLs 1 to 3).CITATION LISTPatent Literature[0004]PTL 1: JP 2016-169027[0005]PTL 2:...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B1/02C08G69/26C08G63/12B65D1/02B32B27/08B32B27/36B32B27/34B29C49/06B29C49/12B29C49/22
CPCB32B1/02C08G69/26C08G63/12B65D1/0215B32B27/08B29K2067/00B32B27/34B29C49/06B29C49/12B29C49/221B32B2439/60B32B27/36B29C49/78B29C49/783B32B2307/748B32B7/12B32B27/18B32B2307/732B32B2439/70B32B2439/80B32B2307/7244B32B2250/24B32B2250/03B29K2077/00B29C2049/023B29C2949/0715B29C2049/7832B29C2049/7834B29C49/087B29C2049/7879B29C49/08B29C49/22B65D1/00B29L2031/712B29L2031/7158B29C2949/3032C08G63/183
Inventor MIYABE, TAKANORI
Owner MITSUBISHI GAS CHEM CO INC
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