JPS6334922Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention can be used for various types of light electrical equipment, their manufacturing equipment and handling related tools, clean room materials, household electrical appliances, casing materials or packaging materials for audio equipment, electronic parts (wafer) manufacturing auxiliary equipment, and even building materials. This invention relates to improvements in plastic plates, sheets, etc. Generally, plastics have high electrical resistivity,
Because they easily become electrically charged due to friction or peeling, when they are used for the purposes mentioned above, they often become unsightly due to the adhesion of dirt and dust in the atmosphere and cause various other troubles. Ta. In order to prevent such charging, intensive research has been carried out in various fields, and some efforts have been put into practical use, but the main methods include: Surface application of conductive paint; Internal kneading of conductive material (carbon). Methods Methods include internal kneading method of antistatic agent (surfactant) and surface coating method of antistatic agent (surfactant). Although these methods impart antistatic properties to each material and achieve the intended purpose of preventing static electricity,
Individually, they have the following drawbacks. That is, regarding the method (2), since many conductive paints are colored, they are often unsuitable for applications requiring translucency and are relatively expensive. Regarding the method described above, since carbon with strong coloring power is used as a filler, its uses are similarly limited, and even if it is a coloring material, it is difficult to obtain a pale color. Regarding the method described above, it has not yet been possible to permanently prevent static electricity, and the effect is easily affected by ambient temperature, etc. Furthermore, when washing with water, the antistatic effect decreases and it takes time to restore it. As for the method described above, the influence of the ambient temperature is large, and in addition, after washing with water, the antistatic agent on the surface is removed and the antistatic property is lost. ......etc. As a plastic material that overcomes these drawbacks of the lifting method, a graft copolymer obtained by graft copolymerizing a vinyl monomer or a vinylidene monomer onto a rubber base polymer having a small specific volume resistivity, or a graft copolymer thereof. Antistatic resin compositions are known that are made of a graft copolymer of Because it has poor processability, is flammable, and is expensive, it has not yet been able to meet the above-mentioned uses satisfactorily. The present invention was devised in view of the above, and takes advantage of the excellent properties of the above-mentioned antistatic resin composition, and provides a new antistatic property that can be used for the above-mentioned purposes such as various types of light electrical equipment by imparting physical performance, etc. To provide synthetic resin laminates. An embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a partial vertical sectional view of a typical embodiment of the present invention. That is, the present invention is obtained by graft polymerizing a vinyl monomer or a vinylidene monomer to a polyvinyl chloride resin base material 1 and a rubber backbone polymer having a small specific volume resistivity on at least one side thereof. This is an antistatic synthetic resin laminate made by integrally heat-pressing an antistatic coating layer 2 of an antistatic resin composition in which a graft copolymer is mixed with a thermoplastic resin compatible with the graft copolymer. . In the illustrated example, a laminate 10 is constructed by integrally heat-pressing the coating layers 2, 2 on both sides of a polyvinyl chloride resin (PVC) base material 1. This laminate 10 is manufactured by a conventional hot press method, etc., the base material 1 is a PVC sheet or plate with a thickness of 1 to 10 mm, and the covering layers 2 are films or sheets with a thickness of 0.1 to 0.5 mm. Although the coating layers 2 and 2 are not limited, they can be made transparent by controlling the refractive index of the graft copolymer and thermoplastic resin, and the base material 1 can be colored since it is actually PVC resin. Therefore, color laminates 10 can be produced by kneading color pigments into PVC resin raw materials.
It can be done. Of course, it goes without saying that the transparent laminate 10 can be made pigment-free. As mentioned above, the antistatic resin composition of the coating layer 2 is a graft copolymer obtained by graft polymerizing a vinyl monomer or a vinylidene monomer to a rubber base polymer having a small specific volume resistivity. It is a substance obtained by mixing a thermoplastic resin which is compatible with the above material, has a permanent antistatic effect (antistatic property), and can be made into a transparent body if desired.
The rubber backbone polymer is composed of 10 to 50% by weight of a monomer having 4 to 500 alkylene oxide groups and 50 to 90% by weight of one or more monomers selected from conjugated dienes and acrylic esters. The reason why the above-mentioned graft copolymer has an antistatic effect is that the phase of this rubber trunk polymer is dispersed in the branch polymer phase in a bridge state during processing, which prevents the charge from being charged. It is said that this is because the rubber particles mainly diffuse and attenuate through the rubber base polymer phase. Moreover, since the polyalkylene oxide group is chemically bonded to the rubber backbone polymer, the antistatic properties do not deteriorate even after severe water washing, thereby guaranteeing a permanent antistatic effect. . Furthermore, the thermoplastic resin having good compatibility with the above-mentioned graft copolymer is used in an amount of 90 to 99 parts by weight based on 10 to 99 parts by weight of the graft copolymer.
1 part by weight is mixed. However, the rubber backbone polymer content is 5 to 80% by weight, preferably 8 to 60% by weight based on the total amount of the graft copolymer and thermoplastic plastic.
% by weight must be present. The thermoplastic resin of the present invention is not particularly limited as long as it has good compatibility with the graft copolymer. , nitrile resins, polymethyl methacrylate and its copolymers, acrylonitrile-styrene-butadiene resins are preferably used. Among these, polyvinyl chloride is often used because of its good chemical resistance. By mixing the above-mentioned thermoplastic resin, the rubber base polymer is embedded in the thermoplastic resin, so that it is completely unaffected by water washing or wiping. Moreover, the physical strength such as tensile strength is also improved compared to the above-mentioned graft copolymer. On the other hand, the PVC resin of the base material 1 is a well-known resin widely used in industry, and has excellent physical properties such as flexural modulus, tensile strength, and elongation, is flame retardant, and can be colored. In addition, it is a highly versatile resin with low raw material costs. The laminate 10 having the above structure includes a base material 1 made of PVC resin having excellent physical performance, etc., and a coating layer 2 having antistatic properties.
Since these are integrally integrated with heat and pressure, the poor physical performance of the coating layer 2 is covered by the base material 1, while the antistatic properties of the laminate 10 are achieved by the coating layer 2, and the synergy between the two is The effect is to provide the laminate 10 with an extremely practical industrial material. In other words, various types of light electrical equipment, their manufacturing equipment and handling related tools, clean room materials, home appliances,
When applied to casing materials or packaging materials for audio equipment, electronic component (wafer) manufacturing auxiliary equipment, and even building materials, antistatic properties can eliminate various problems caused by the adhesion of dirt and dust due to electrostatic charge. wiped away by the permanent antistatic effect of the coating layer 2 having
Due to the excellent physical performance of the PVC resin base material 1, it is positioned as an excellent material that facilitates molding process, provides physical strength, is flame retardant, and reduces material costs. In addition, due to the nature of conventional plastic materials designed to prevent static electricity, it was difficult to obtain transparent materials, and the color tones were limited, which narrowed the scope of their use.
Since the base material 1 of the laminate 10 of the present invention is a PVC resin that can be freely colored, various color tones can be selected including transparent materials, and the above-mentioned applications are expected to expand dramatically. Table 1 shows the various performances of the laminate of the present invention and those of other materials.

【table】

[Table] Incidentally, although the example diagram shows a case in which the coating layer 2 is integrally formed on both sides of the base material 1 by heat pressing, it does not deviate from the present invention to form the coating layer 2 on only one side. This laminate 10 in which the coating layer 2 is integrated with heat and pressure on only one side is as follows:
For example, in cases where dirt, dust, etc. attached to the back surface of a casing material does not cause trouble, using the coating layer 2 side as the front surface has the effect of maintaining the appearance and further reduces raw material costs. Therefore, it can be appropriately adopted as above depending on the purpose. In addition, the thickness of the laminate can be used for a variety of purposes as described above, so it is important to
It goes without saying that it can be determined as appropriate, taking into consideration costs and other factors. As described above, the laminate of the present invention is a highly useful material and its utility value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view of a typical embodiment of the present invention. Explanation of symbols: 1... PVC base material, 2... Antistatic coating layer, 10... Laminate.

Claims (1)

[Scope of utility model registration request] The above graft copolymer obtained by graft polymerizing a vinyl monomer or a vinylidene monomer to a polyvinyl chloride resin base material and a rubber backbone polymer having a small specific volume resistivity on at least one side thereof. An antistatic synthetic resin laminate comprising an antistatic coating layer made of an antistatic resin composition mixed with a graft copolymer and a compatible thermoplastic resin under heat and pressure.