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Moulded polypropylene ester container for microwave cooking

A polypropylene resin and microwave technology, which is used in special materials for cooking utensils, synthetic resin layered products, containers, etc., can solve problems such as lifting and easy deformation of containers.

Inactive Publication Date: 2002-07-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the fact that in some cases, the temperature of the container immediately rises to about 120 to about 140° C. after heating, so there is a problem that the heated container is easily deformed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Obtain the foamed polypropylene resin container for microwave cooking by the following steps: manufacture a foamed polypropylene resin sheet made of two types of three layers, i.e. a non-foamed layer, a foamed layer and a non-foamed layer, according to the method described below; thermally bonding the multilayer film described above to form a laminate; and subjecting the laminate thus obtained to vacuum molding. The multilayer film is composed of a cast polypropylene film layer, an adhesive resin layer, a saponified ethylene-vinyl ester copolymer layer, and an adhesive resin layer, and the thicknesses thereof are 70 μm, 20 μm, 30 μm, and 20 μm, respectively. The properties of the foamed polypropylene resin container for microwave cooking thus obtained were evaluated, and the results are shown in Table 1. (Material of the foam layer)

[0064]A mixture of polypropylene and polyethylene prepared by a two-step polymerization method with a blending weight ratio of 70:30 was...

Embodiment 2

[0084] A laminate was produced in the same manner as in Example 1, except that a layer of the resin composition described below was adhered to a foamed polypropylene resin sheet. A foamed polypropylene resin container for microwave cooking was produced by subjecting the laminate to vacuum molding. The foamed polypropylene resin containers for microwave cooking thus obtained were evaluated, and the results are shown in Table 1. (Lamination of Foamed Polypropylene Resin Sheet and Resin Composition Layer)

[0085] A laminate was obtained by thermally bonding a foamed polypropylene resin sheet and a multilayer film consisting of three types of four layers, the multilayer sheet including (from the laminated surface side) a heat seal layer (70 μm), maleic anhydride Modified polypropylene layer (20 μm), saponified ethylene-vinyl ester copolymer product layer (30 μm), and maleic anhydride-modified polypropylene resin layer (20 μm) (thermal bonding surface). The resin composition use...

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Abstract

An object of the present invention is to provide a foamed polypropylene resin container for microwave cooking which is free from deformation upon cooking by a microwave oven and excellent in heat resistance. The foamed polypropylene resin container for microwave cooking of the present invention, on at least one side of a foamed polypropylene resin layer, a non-foamed layer containing 100 parts by weight of a polypropylene resin and 40 to 100 parts by weight of talc.

Description

field of invention [0001] The present invention relates to a foamed polypropylene resin container for microwave cooking having excellent flexural rigidity under high temperature conditions. Background of the invention [0002] Foamed polypropylene resin products are excellent in thermal insulation ability and light weight, and have been used as construction / earth moving materials or packaging containers. Japanese Patent Application Laid-Open No. 264938 / 1987 discloses a multilayer container for microwave cooking made of foamed polypropylene resin. [0003] Recently, foods such as curry powder packaged in containers kept at room temperature have become popular, and they are heated in a microwave oven with the packaging. Thus, when using a microwave oven with a power output of 500 watts, cooking takes 3 minutes or more. This causes the temperature of the container to rise to about 120 to about 140° C. immediately after heating in some cases, so that there is a problem that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D81/34A47J36/02A47J36/04B32B5/18B32B27/32
CPCY10S99/14B32B5/18B65D81/3453A47J36/027A47J36/04B65D81/34
Inventor 花田晓野殿光纪黑田龙磨
Owner SUMITOMO CHEM CO LTD
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