JPH0572712U - Packaging container - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to the provision of a packaging container that can be easily disposed of at home. [Composition] A packaging container characterized by using foamed polycaprolactone as the main material, and shrinks significantly by boiling water or hot water to make it compact, and decomposes and disappears when left in a natural environment. It has the characteristic that it does.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides a novel packaging container that is easy to dispose at home and does not pollute the environment.

[0002]

[Prior Art]

 Conventionally, trays made of expanded polystyrene have been frequently used for packaging of fresh foods, etc., and since they are lightweight and easy to mold, they are also used as packaging materials for various devices, electric appliances and the like. However, such a material has processing disadvantages such as high bulk, non-decomposability, which cannot be left in a natural environment, and a large amount of heat generation, which easily damages an incinerator.

[0003]

[Problems to be solved by the device]

 In view of this point, the present invention provides a novel packaging container which has never been used and is compact and can be easily disposed of after use.

[0004]

[Means for Solving the Problems]

 However, the present invention relates to the provision of a packaging container characterized in that, in its constitution, foamed polycaprolactone is the main component of the material.

The polycaprolactone constituting the present invention is particularly composed of a polymer having a monomer unit represented by the following formula (I). Such a polymer is obtained by the polymerization of ε-caprolactone, the molecular weight thereof is about 30,000 to 200,000, the number n in the formula (I) is 600 <n <900, and the melting point is about 60 ° C. For example, "PLACCEL H" (trade name: manufactured by Daicel Chemical Industries, Ltd.) can be exemplified as being inexpensive, having a low melting point, and easily decomposed and disappeared in a natural environment such as seawater or soil. Etc.

The container of the present invention is characterized in that such a polycaprolactone is foamed and is made of a material having a high volume. Examples of means for foaming this include azodicarbonamide (ADCA), If a foaming agent such as sodium bicarbonate is added to the above polycaprolactone in a proportion of 0.1 to 3.0% by weight, the volume thereof is increased by about 1.3 to 10 times and the density is increased to about 0.1. It can be up to 0.85 g / cc.

It is to be noted that the selection of the type of the foaming agent and the adjustment of the addition amount thereof are arbitrary, and the polycaprolactone polymer is used alone or mainly, for example, polypropylene having photodegradability and hydrolyzable glycol. Acids, glycolides, L-lactides, D, L-lactides, D-lactides, mixed lactides of L- and D-forms, homo- or mutual copolymers of paradioxanone, or biodegradable polyhydroxy. Butyrate, polyhydroxyvalerate, copolyester of polyhydroxybutyrate and parahydroxyvalerate, etc. are arbitrarily added to foam, and the characteristics due to such combination, for example, change in degradability, melting point, physical properties, etc. You can also

The polycaprolactone foamed as described above is processed by molding or the like by a usual method to form various containers. FIG. 1 shows an example of a food tray.

[0009]

[Action]

 The present invention has the above-mentioned structure, and since the melting point of polycaprolactone itself is low, after use, boiling water having a temperature exceeding the melting point, for example, about 70 ° C is poured or immersed in the hot water, and its volume is reduced. According to the above example, it can be reduced to about 10% to 70% of the initial value, and thereafter, if it is buried in soil or the like, it will spontaneously decompose and disappear.

[0010]

[Configuration example]

 To "PLACCEL H-7" (trade name: manufactured by Daicel Chemical Industries, Ltd., polycaprolactone having a molecular weight of 100,000), 1% by weight of ADCA was added as a foaming agent and the mixture was extruded with a T-die to have a density of 0. A foamed sheet having a thickness of 26 g / cc and a thickness of 1 mm was obtained. After this was cut into a square shape, it was pressed at room temperature to form a food packaging tray having the shape shown in FIG. Such a container has a function comparable to that of a conventional Styrofoam container for food packaging. On the other hand, when this container is used, hot water at 70 ° C is applied to the container, which is 1/3 of the original size. It has been reduced. When it was buried in the soil, it decomposed and disappeared after about 1 year.

[0011]

[Effect of the device]

 As described above, the present invention eliminates the drawbacks of conventional disposable containers, has the feature that it can be easily disposed of at home, and eliminates the drawbacks of handling such as conventional bulkiness. Can be done. The container of the present invention is not limited to food products, and can be suitably used as various packaging materials, for example, packaging containers for electric appliances, cushioning materials, filling materials, and the like.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating the configuration of the present invention.

Claims (1)

[Scope of utility model registration request] 1. A packaging container comprising a foamed polycaprolactone as a main component.