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Thermoplastic resin sheet and its container

A thermoplastic resin and sheet technology, applied in the direction of rigid containers, containers, household containers, etc., can solve the problems of difficulty in notch fracture performance, notch fracture performance, interlayer adhesion and practical strength, and water vapor barrier properties. Achieve good water vapor barrier properties, excellent notch fracture properties, and good formability

Active Publication Date: 2018-01-16
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the slit is cut in a dotted line, there is a region where the olefin resin layer is not completely cut, so it is difficult to exhibit good slit breakability by the above-mentioned method.
To solve this problem, there is a method to moderately embrittle the olefin-based resin layer, but until now, it has been quite difficult to achieve a combination of notch fracture performance, interlayer adhesion, practical strength, and water vapor barrier properties

Method used

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  • Thermoplastic resin sheet and its container
  • Thermoplastic resin sheet and its container
  • Thermoplastic resin sheet and its container

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] The thermoplastic resin sheet according to the first embodiment of the present invention is a thermoplastic resin sheet which is a single-layer thermoplastic resin sheet including only a mixed resin layer containing a styrene-based resin and an olefin-based resin as resin components, which The styrene-based resin in the thermoplastic resin sheet is 70-95% by mass, and the olefin-based resin is 30-5% by mass. The styrene-based resin in the mixed resin layer contains polystyrene with a mass average molecular weight of 270,000-370,000.

[0024]

[0025] The mixed resin layer is an important layer for imparting water vapor barrier properties to the sheet, and is basically formed of a resin mixture of a styrene-based resin and an olefin-based resin. The mixed resin layer may be a single layer or multiple layers.

[0026] Examples of styrene-based resins include polystyrene, polyα-methylstyrene, polyvinylnaphthalene, polyvinylanthracene, impact-resistant polystyrene, copoly...

no. 2 approach

[0036] Although the thermoplastic resin sheet of the present invention can also be used as a single-layer sheet composed of only the above-mentioned mixed resin layer, in order to realize good sealing strength between the container and the capping material using the sheet, it is preferable to use the above-mentioned mixed resin layer. Styrene resin layers mainly composed of styrene-based resins were provided on both surfaces of the resin layer.

[0037] That is, the thermoplastic resin sheet according to the second embodiment of the present invention is a thermoplastic resin sheet including a mixed resin layer containing a styrene-based resin and an olefin-based resin as resin components, and the styrene-based resin containing A styrene resin layer is laminated on the mixed resin layer. The thermoplastic resin sheet contains 70 to 95% by mass of styrene resin and 30 to 5% by mass of olefin resin. The styrene resin in the mixed resin layer is Contains polystyrene with a mass av...

no. 3 approach

[0042] When using a styrene resin layer mainly composed of a styrene resin, an intermediate layer may be provided between the mixed resin layer and the styrene resin layer for the purpose of improving interlayer adhesion with the mixed resin layer. The styrene-based resin and olefin-based resin used in the intermediate layer can be used in the same way as the styrene-based resin and olefin-based resin that can be used in the aforementioned mixed resin layer, and can be used without impairing formability, sheet appearance, strength, rigidity and Use within the range of notch fracture properties.

[0043] That is, the thermoplastic resin sheet according to the third embodiment of the present invention is a thermoplastic resin sheet including a mixed resin layer containing a styrene-based resin and an olefin-based resin as resin components, and the styrene-based resin containing A styrene resin layer is laminated on the mixed resin layer, and an intermediate layer containing a st...

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Abstract

The present invention provides a thermoplastic resin sheet and its container. The thermoplastic resin sheet ensures good formability, practical strength, and sealing strength with a capping material, and not only has good water vapor barrier properties, but also Excellent notch fracture performance that can also be used in various notch forms is realized, and interlayer adhesion is excellent. The thermoplastic resin sheet comprises a mixed resin layer containing a styrene-based resin and an olefin-based resin as resin components, the styrene-based resin in the thermoplastic resin sheet is 70-95% by mass, and the olefin-based resin is 30-5% by mass The styrene-based resin of the mixed resin layer contains polystyrene with a mass average molecular weight of 270,000 to 370,000.

Description

technical field [0001] The present invention relates to a thermoplastic resin sheet and its container. Background technique [0002] Polystyrene-based sheets are widely used in various packaging materials such as food containers, beverage containers, industrial containers (including various trays), and blister packs. Among them, food containers such as oily confectionery and dairy products require water vapor barrier properties. Patent Documents 1 to 4 describe that styrene-based resin layers are used as both outer layers, and olefin-based resin layers such as polypropylene are provided inside through an adhesive layer to impart water vapor barrier properties and suppress quality degradation due to moisture absorption of the contents. multi-layer resin sheet, and a multi-layer resin sheet with a polyester resin layer on the inner layer to impart flavor preservation. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/04B32B27/30B65D1/00B65D1/26C08J5/18C08L23/00
CPCB32B27/302B32B27/08B32B27/32B32B2250/24B32B2274/00B32B2307/54B32B2307/558B32B2307/7246B32B2439/40B32B2439/70B32B2439/80C08J5/18C08J2323/00C08J2325/04C08L25/06
Inventor 泽里正中里利胜广川裕志武井淳长野利生
Owner DENKA CO LTD