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Gas-barrier multilayer structure and process for producing the same

A multi-layer structure, gas barrier technology, applied in chemical instruments and methods, lamination, rigid containers, etc., can solve the problems of not specifying the specific properties of the multi-layer structure, and not recording the specific conditions of stretching.

Inactive Publication Date: 2007-07-18
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document does not describe the specific conditions for stretching the polyamide MXD6 containing phyllosilicates, nor does it describe the specific properties of the multilayer structures obtained under specific stretching conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] Next, a method for producing the gas barrier multilayer structure of the present invention will be described. First, a multilayer laminate comprising at least one layer 1 , at least one layer 2 and optionally layer 3 is prepared by known methods.

[0045] The multilayer laminate is then stretched and thermoformed under specific conditions to increase the crystallinity and orientation of layer 1, thereby improving gas barrier properties. "Stretch thermoforming" as used herein includes stretching of a film or sheet, stretch blow molding of a parison, etc., and deep draw forming of a film or sheet. Stretch thermoforming is generally performed at a temperature equal to or higher than the glass transition point of the resin material. Since the glass transition point varies with the type of resin and the degree of moisture absorption, thermoformability at a temperature equal to or higher than the glass transition point of the composite resin material varies greatly depending...

Embodiment

[0069] The present invention will be described in more detail below with reference to the following Examples and Comparative Examples. However, these examples are only for illustrating the present invention, and are not intended to limit the present invention. In the following Examples and Comparative Examples, various properties were measured and evaluated by the following methods.

[0070] (1) Melting point, glass transition point and Heat of Temperature-Rise Crystallization

[0071] The measurement was performed using a heat flow differential scanning calorimeter "DSC-50" from Shimadzu Corporation under the following conditions:

[0072] Standard: α-alumina

[0073] Sample: 10 mg

[0074] Heating rate: 10°C / min

[0075] Measuring temperature range: 25-300°C

[0076] Atmosphere: 30ml / min nitrogen

[0077] (2) Haze

[0078] Measured according to ASTM D-1003 using "COH-300A" color haze measuring device from Nippon Denshoku Industries Co., Ltd.

[0079] (3) Oxygen perme...

reference example 1

[0089] Composite resin C1 was formed at 260° C. to a thickness of 180 μm using a small-sized film forming machine (“LaboPlastomil” from Toyo Seiki Seisaku-Sho, Ltd.; screw diameter: 20 mmΦ; T-die width: 200 mm) single-layer unstretched film. The resulting unstretched film was subjected to simultaneous biaxial stretching using a tentering biaxially stretching machine available from Toyo Seiki Seisaku-Sho, Ltd. under the following conditions: a stretching temperature of 100° C., The preheating time is 30 seconds, the line speed in each direction is 60% / second, and the stretching ratio is 3×3 times. The maximum tensile stress during stretching was 0.7 MPa per unit cross-sectional area, and the haze of the obtained film (thickness: 20 µm) was 0.5%. The oxygen permeability at 23°C and 60% relative humidity (RH) is 0.05 ml·mm / square meter·day·atmospheric pressure, the heat of crystallization measured by DSC is 9 joules / gram, and the degree of orientation is 19.

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PUM

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Abstract

A gas-barrier multilayer structure which comprises at least one gas-barrier layer and at least one resin layer. The gas-barrier layer comprises a composite resin (C) comprising: a polyamide resin obtained by condensation-polymerizing m-xylylenediamine and a linear aliphatic alpha,omega-dicarboxylic acid; and a phyllosilicate treated with an organic swelling agent. The resin layer comprises a thermoplastic resin (D) having a lower glass transition temperature than the composite resin (C). The gas-barrier multilayer structure is obtained by subjecting an unstretched layered product to stretching / thermoforming under specific conditions. The stretching / thermoforming under specific conditions is effective in inhibiting fine cracks which may be present in the resins from causing blushing or a decrease in gas-barrier properties. Thus, a multilayer structure excellent in transparency and gas-barrier properties is obtained.

Description

technical field [0001] The present invention relates to a multilayer structure having excellent gas barrier properties and a method for preparing the same, and particularly relates to stretch thermoforming such as stretch blow molding and stretching of an unstretched laminate having a gas barrier layer without A method for producing a multilayer structure having excellent transparency and gas barrier properties causing whitening and a decrease in gas barrier properties, and a multilayer structure obtained by the method. Background technique [0002] For a long time, food or beverage packaging materials have been required to have other properties such as high strength, not easy to break, and good heat resistance, in order to protect the packaged substances when they are sold under environmental conditions, storage under refrigeration and other conditions, and such as high temperature sterilization In addition to being protected from damage during handling, good transparency i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/34B29C49/06B29C49/22B29C55/16B65D1/09B65D65/40B29K23/00B29K77/00B29K303/06B29L7/00B29L9/00B29C51/00B29C51/04B29C55/02B32B7/027
CPCB32B27/34B29C51/04B29C55/023Y10T428/31725Y10T428/1383B29K2995/0067B29C51/002Y10T428/31736B29K2077/00B32B7/027B29C49/087B29C2049/7879B32B27/08B32B27/24B32B2307/7242B32B2307/718B32B2038/0028B32B38/0012B32B2307/518B32B2439/60B32B1/00
Inventor 神田智道丸尾和生
Owner MITSUBISHI GAS CHEM CO INC
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