JPH0528040Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a laminate molded product made by laminating sheet layers made of two or more synthetic resins, etc., and includes a film or sheet and a tube-shaped molded product.

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 made of an antistatic agent on the surface of the synthetic resin. However, these layers tend to peel off when they come into contact with other objects, and there is a risk that they may have an adverse effect on other objects with which they come in contact, so that a stable antistatic effect cannot be obtained at present. In addition, various conventional laminates, especially aluminum foil and plastic film, tend to generate static electricity. Since this is laminated with an adhesive layer between the aluminum foil and the plastic film that is the base material, static electricity is generated at the interface between this thin, high-resistivity adhesive layer and the dielectric base material. This is because it is easy to accumulate.

Therefore, we focused on the fact that static electricity is more likely to be generated at the interface between dielectrics as described above than at the contact surface between the surrounding air and the dielectric. A laminate molded product has been proposed that has an extremely stable antistatic effect that is water and solvent resistant, regardless of changes in the outside air, by not exposing the antistatic layer on the surface and having a conductive layer parallel to the surface inward. Ta.

However, the fixation of the antistatic agent to the adhesive layer of the laminate molded product becomes unstable due to the influence of the solvent, and the adhesive strength of the adhesive itself decreases. Furthermore, when adhesives, solvents, and antistatic agents are mixed, water evaporates, which increases the resistivity of the antistatic agent itself. Therefore, the desired antistatic effect may not be achieved in some cases.

This idea was made in consideration of these points. By mixing a resin-mixed super absorbent polymer into the adhesive and adsorbing the water-containing antistatic agent to the super absorbent polymer, the adhesive is created. The object of the present invention is to provide a laminate molded product that can stably exhibit the effect of an antistatic agent while retaining moisture without reducing strength.

Below, an embodiment of this invention will be explained with reference to the drawings. Fig. 1 shows a first sheet layer 1 made of synthetic resin.
and a second sheet layer 2 also made of synthetic resin are bonded together with an adhesive layer 3 containing an adhesive and a resin-mixed super absorbent polymer that adsorbs moisture and an antistatic agent.

This invention has the above structure, and in a laminate molded product, the adhesive layer 3, which is easily charged and forms the interface with the first sheet layer 1 or the second sheet layer 2 made of plastic or the like, contains an antistatic agent having moisture. Therefore, the adhesive interface between the first sheet layer 1 or the second sheet layer 2 and the adhesive layer 3 is not charged. In addition, since the conductive layer is provided inside each layer parallel to the outer surface of the first sheet layer 1 or the second sheet layer 2, each surface of the first sheet layer 1 or the second sheet layer 2 is No static electricity is generated even when it comes in contact with or rubs against objects. At this time, the width from the surface of the laminate molded product to the conductive adhesive layer, that is, the thickness of each layer of the first sheet layer 1 or the second sheet layer 2 in this embodiment, is usually preferably about 1 mm or less. Further, the adhesive layer 3 having electrical conductivity is desirably about 10Ω or less.

Moreover, since the adhesive layer 3 of this invention contains a resin-mixed super absorbent polymer in which an antistatic agent is adsorbed together with moisture, the antistatic agent is stably retained in the adhesive layer 3. Moreover, the moisture necessary for the antistatic agent can be maintained, and the above-mentioned antistatic effect can be stably exhibited over a long period of time without reducing the adhesive strength of the adhesive. Furthermore, since the superabsorbent polymer has good retention of the antistatic agent, even a small amount of the antistatic agent mixed in in advance can be effective.

This super absorbent polymer has a weight of 10 to 1000 times its own weight.
It absorbs twice as much water, is difficult to release and retains water even under some pressure, and is insoluble in water. This is a water-soluble polymer that has been crosslinked and made insolubilized, and this insolubilization treatment may be performed before or after polymerization.

In addition, this invention has an adhesive layer 3 that has an antistatic effect.
is not exposed on the outer surface of the laminate molded product, so unlike conventional products where the layer consisting of antistatic agent is exposed on the outer surface, it is water resistant and solvent resistant, and the layer will deteriorate with use. There is no risk of damage if it peels off. Therefore, this point will also have long-term effects.

Next, FIG. 2 shows an application of this invention to a multilayer laminate molded product, in which the first sheet layer 4, the second sheet layer 5, and the third sheet layer 6 are each formed using the same adhesive layer 3 as in the embodiment shown in FIG. It was glued together with. This embodiment also has the same effects as the above embodiment.

Moreover, what is shown in FIG. 3 is an application of this invention to tube 7. That is, the same adhesive layer 3 as in each of the above embodiments is provided between the outer tube layer 8 and the inner tube layer 9, and thereby the outer tube layer 8 and the inner tube layer 9 are brought into close contact with each other. As with , the adhesive layer, which tends to generate and retain static electricity, has been made conductive, so it has a high antistatic effect.
If you use this as a bag, the sides of the bag may hit other objects,
Even if static electricity is generated due to rubbing of items stored inside, it is immediately erased by the adhesive layer 3. Moreover, since this conductive adhesive layer is not exposed on the inside and outside surfaces of the bag, the antistatic agent does not directly hit the stored items, and the conductive layer is also protected without any negative effects, resulting in an antistatic effect. last. Further, as shown in FIG. 4, this tube 7 is an annular extrusion body 13 that extrudes an annular conductive adhesive layer 3 between the inner peripheral wall and the outer peripheral wall of the tube extrusion groove 12 of the ring die 11 in the inflation method. The laminated tube 7 of this invention can be obtained very easily by extruding the adhesive layer 3 integrally between the outer tube layer 8 and the inner tube layer 9 when extruding the tube 7.

In the above embodiments, each sheet layer was made of synthetic resin, but it may be made of the same or different dielectric material.For example, it can also be applied to a laminate molded product of a layer of metal, paper, fiber, etc. and a synthetic resin layer. This has the same effect as the example.

This device has the above structure, and the adhesive layer between each sheet layer contains a resin-mixed super absorbent polymer that has an antistatic agent adsorbed together with water, so the antistatic agent prevents static electricity. It can maintain sufficient moisture to be effective, and the antistatic effect can be stably produced over a long period of time.

Furthermore, since this antistatic agent is adsorbed together with the superabsorbent polymer, moisture and antistatic agent can be retained in the adhesive layer without reducing adhesive strength.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing examples of this invention, Figure 3 is a perspective view of an example in which this invention is applied to a tube-shaped molded product, and Figure 4 is a tube-shaped molded product of this invention. FIG. In the figure, 1 is a first sheet layer, 2 is a second sheet layer, 3 is an adhesive layer, 7 is a tube, 8 is an outer tube layer, and 9 is an inner tube layer.

Claims (1)

[Scope of utility model registration request] A laminate molded product characterized by adhering between two or more sheet layers with an adhesive layer containing an adhesive and a resin-mixed super absorbent polymer that adsorbs moisture and an antistatic agent. .