JPH0310637Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a synthetic resin molded product that has an antistatic effect.More specifically, a sealed void is provided along the side wall of the synthetic resin molded product, and the inner periphery of this void is provided. The present invention relates to a synthetic resin molded product that has an antistatic effect regardless of changes in the humidity of the outside air by encircling a conductive layer, and has a more effective antistatic effect.

The surface of a synthetic resin has the property of being easily charged, and therefore it is necessary to change these properties by modifying the surface. This antistatic treatment can be roughly divided into coating methods and kneading methods, and both of these methods form a layer consisting of an antistatic agent on the surface, but these conventional antistatic agents rely on the action of hydroxide ions. This allows it to constantly absorb moisture and be effective. Figure 1 is a graph showing the correlation between humidity and antistatic effect.The effect does not decrease significantly up to about 50% humidity, but when the humidity drops below 20%, the effect decreases so much that it is no longer practical. There are many cases.
As the outside air or indoor humidity decreases, static electricity is more likely to be generated on the surface of the synthetic resin, but at the same time, the antistatic effect decreases. In other words, the conventional treatment method using an antistatic agent has the drawback that its effectiveness is greatly affected by the outside air, especially humidity. Further, in conventional synthetic resins in which an antistatic layer is provided on the surface, there is a risk that these layers will gradually peel off due to contact with other substances, water, solvents, etc., and the durability is poor. Furthermore, when this was used in a container, the antistatic layer was exposed on the inner and outer surfaces of the container, which could have an adverse effect on the stored items.

This idea was made in consideration of these points. When dielectric materials such as synthetic resins are stacked on each other, static electricity is generated due to contact pressure (frictional force). Electromagnetically, the contact surface with the surrounding air However, we focused on the fact that static electricity is more likely to be generated and stored due to contact between high dielectric materials or close interfaces, and we developed a conductive layer in areas where this static electricity is likely to be generated and stored. The molded product has a sealed gap between the conductive layers, which prevents the generation of static electricity, and even if static electricity does occur, it instantly removes it. It is possible to obtain a molded product that is highly durable, has no conductive layer exposed on the outer surface, does not come into contact with other objects, and is therefore highly durable and has been subjected to safe antistatic treatment.

An embodiment of this invention will be described below with reference to the drawings.
In Fig. 2, 1 is a container 1 made of synthetic resin;
The peripheral wall of this container 1 is composed of an outer peripheral layer 2 and an inner peripheral layer 3, and has a sealed gap 4 between the opposing surfaces of the outer peripheral layer 2 and the inner peripheral layer 3. , conductive layers 5 and 6 are provided on the inner walls of the outer circumferential layer 2 and inner circumferential layer 3.
It has been established.

Also, the one shown in Fig. 3 is a freezing container 7 which is also made of synthetic resin and contains electronic parts such as LSI and IC.
The peripheral wall of this container 7 is composed of an outer peripheral layer 8 and an inner peripheral layer 9, and a sealed cavity 10 is provided between the relative walls of these layers 8 and 9, and the outer peripheral layer on the inner periphery of this cavity 10 is Conductive layers 11 and 12 are provided on the inner walls of the inner peripheral layer 8 and the inner peripheral layer 9, respectively.

The container 13 shown in FIG. 4 is also made of synthetic resin, and this container 13 has a thick side wall body 14, and an outer peripheral layer 17 is formed through sealed voids 15 and 16 on the inside and outside of the side wall body 14, respectively. and an inner peripheral layer 18, and conductive layers 19, 20, 2 are provided on the inner and outer walls of the side wall body 14, the outer peripheral wall 17, and the inner wall of the inner peripheral layer 18, respectively, on the inner periphery of these voids 15 and 16.
1 and 22 are provided.

The conductive layer in the above embodiments may be made of a conventional antistatic agent containing an appropriate amount of water, or may be made of an organic electrolyte containing metal ions, etc., but the resistivity is 10 ⁸ Ω to 10 ¹² Ω is preferable. In addition, the outer circumferential layers 2, 8, 17 and the inner circumferential layer 3,
9 and 18 may be the same or different from each other, and each layer should be as thin as possible (for example,
100Å to 1000Å) Good.

In this way, in this invention, even in the case of a conventional conductive layer containing an appropriate amount of water in an antistatic agent, since it is encapsulated inside the side wall of the molded product, the required amount of water is always present. It maintains an amount of humidity that can exhibit an antistatic effect. Therefore, even if the molded product is placed in a low humidity environment, the desired antistatic effect will always occur. In addition, these conductive layers are not exposed on the inner and outer surfaces of the molded product, so they do not peel off due to contact with other objects, water, solvents, etc., and are durable.
In addition, the conductive material such as the antistatic agent does not come into contact with other objects that are in contact with the inner and outer surfaces of the molded product, and does not have any adverse effects. Furthermore, in this design, a conductive layer is provided in a place where static electricity is likely to be generated and stored, and since there is a gap between these conductive layers, it becomes a high dielectric material, and the static electricity generated inside and outside of the molded product is absorbed by these conductive layers. Coupled with the fact that the layers are close to the inner and outer surfaces of the molded product, different charges concentrate on these conductive layers, cancel each other out, and are instantly erased. Therefore, even if other objects come into contact with the inner and outer surfaces of the molded product and cause friction, static electricity will not be generated, and even if static electricity is generated, it will be instantly erased. Moreover, the outer peripheral layers 2, 8, 17
And when the inner peripheral layers 3, 9, and 18 are somewhat movable, each conductive layer moves and electricity easily moves.
Furthermore, it has a high antistatic effect.

As described above, this invention is a molded product in which a conductive layer made of an antistatic agent is provided on the inner periphery of a sealed cavity provided inward of the side walls close to the inner and outer surfaces of the molded product, which has an extremely high antistatic effect. It is durable and has the effect of not adversely affecting other objects with which it comes in contact, and is not limited to the above embodiments.

[Claims for Utility Model Registration] A hermetically sealed gap is integrally or continuously provided inside the sidewall in close proximity to the inner and outer surfaces of the sidewall, and a conductive layer made of an antistatic agent or the like is applied to the inner periphery of the gap. A synthetic resin molded product that has an antistatic effect.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the correlation between humidity and antistatic effect, and FIGS. 2, 3, and 4 are sectional views showing examples of this invention. In the figure, 1, 7, 13 are containers, 2, 8, 17 are outer layers, 3, 9, 18 are inner layers, 4, 10, 1
5, 16 are voids, 5, 6, 11, 12, 19,
20, 21, 22 are conductive layers.