JPS61281154A - Electrically conductive resin - Google Patents

Abstract

PURPOSE:To obtain an electrically conductive resin exhibiting high electrical conductivity even at a low content of electrically conductive filler, by adding an electrically conductive oxide filler in combination with a charge transfer complex to a resin. CONSTITUTION:(A) An electrically conductive oxide filler, preferably zinc oxide doped with Al or titanium oxide having Sb-doped SnO2 coating layer and (B) a charge transfer complex, preferably a complex containing boron and nitrogen are kneaded into a resin under heating or at normal temperature using twin roll or three-roll mill or with an injection molding machine. The component B is attached preferably to the component A prior to kneading. By the addition of the component A and component B in combination to the resin, the component A is surrounded with the component B, and accordingly, the electron movement in the component B near the component A is induced by passing electric current through the component A to cause the electron flow of A B A. Consequently, high electrical conductivity can be imparted to a resin by the addition of only a small amount of the component A.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a conductive resin. More specifically, the present invention relates to a conductive resin that has good conductivity even when a small amount of conductive filler is mixed into the resin.

<Prior Art> Resin is used as a storage container for ICs and LSIs, but there is a demand for resins that are antistatic in order to prevent destruction of ICs and LSIs due to static electricity discharge. There is also a great demand for resins that are less likely to attract dirt and dust due to electrostatic charge as materials for clean room walls, floors, clothing, etc. Therefore, it is widely practiced to impart conductivity to resins. In order to impart conductivity to the resin, it is common to include an inorganic material having conductivity (conductive filler). This conductive filler may be metal, carbon fiber or powder.

Various oxides having electrical conductivity are known.

<Problems to be solved by the invention> In order for a resin containing a conductive filler to exhibit conductivity,
Contact between conductive fillers is required.

For this purpose, it is necessary to contain a sufficient amount of conductive filler. For example, zinc oxide-based and titanium oxide-based conductive fillers have a surface resistance of 1010
In order to exhibit conductivity of B76 or less, a content of 50 weight or more is required. This causes problems such as the resin becomes brittle, its strength decreases, and its specific gravity increases. Furthermore, when resins containing conductive fillers are processed into fibers, for example, there are problems such as clogging of nozzles. To solve this problem, conductivity is required.

Next, there is also a problem with the type of conductive filler. That is, when metals, carbon, etc. are used as conductive fibers, the color tone is limited to black or a color close to black, and when these are added to a resin, the resin becomes black, so there is a problem that the applications are limited.

<Means for Solving the Problems> The present inventors have discovered that by adding a combination of a conductive filler and a charge transfer complex to a resin, it is possible to achieve a predetermined conductivity in the resin even if the amount of the conductive filler added is significantly reduced. I gained a wealth of knowledge through this grant. The present invention is based on the above knowledge, and solves the conventional problems such as a decrease in the strength of the resin, an increase in specific gravity, and a decrease in processability by reducing the amount of inorganic additives (conductive filler) in the resin. It is. Furthermore, an oxide is used as a conductive filler, especially Al-doped zinc oxide or Sb-doped Sno.
By using coated titanium oxide, the white color can be maintained and the problem of limiting the uses of the resin has been solved.

<Configuration of the Invention> According to the present invention, a conductive material containing an oxide conductive filler and a charge transfer complex, and containing the charge transfer complex in an amount of 0.05 to 30% by weight based on the oxide conductive filler. A synthetic resin is provided. Further, as a preferred embodiment thereof,
Conductive resin or oxide groove in which the charge transfer complex contains B and N! Conductive resins are provided in which the filler is Sb-doped SnO, coated titanium oxide or A1-doped zinc oxide.

The resin of the present invention contains a charge transfer complex along with an oxide conductive filler. A charge transfer complex is a composite of an electron donor (a molecule that easily donates an electron called a donor) and a molecule that has a large electron affinity and easily accepts an electron called an electron acceptor.In the case of the present invention, an oxide conductive filler A charge transfer complex coordinates around the conductive filler.For this reason, when electricity flows through the conductive filler, electrons in the charge transfer complex adjacent to the conductive filler are induced to move, and the structure easily changes from the conductive filler to the charge transfer complex to the conductive body. Electrons flow to.

Therefore, the amount of conductive filler and charge transfer complex added does not need to be so large that they come into contact with each other, and the amount of conductive filler added can be significantly reduced.

The amount of the charge transfer complex added varies depending on the degree of conductivity to be obtained, but it is 0.05 to 0.05 to the oxide conductive filler.
It may be 30% by weight. If it is less than 0.05% by weight, the amount of charge transfer complex that approaches the conductive filler will be small, resulting in insufficient conductivity. On the other hand, even if the charge transfer complex is added in an amount of 30% by weight or more, the effect does not change much.

Next, there are various types of charge transfer complexes, but in the present invention, a remarkable effect was obtained by using a complex containing boron and nitrogen. In this case, nitrogen acts as a donor and boron acts as an acceptor. This type of charge transfer complex includes, for example, one in which an alkyl group is present between N and B.

Next, as the conductive filler, an oxide conductive filler is used. In particular, zinc oxide doped with Al or titanium oxide coated with SnOt doped with Sb is white, and when added to a resin, the color tone can be adjusted by adding other pigments or dyes.

The type of resin containing the charge transfer complex and oxide conductive filler is not limited, and a wide variety of resins can be used, such as acrylic resin, polypropylene resin, vinyl chloride, polyester, and nylon.

To incorporate an oxide conductive filler into the resin.

A charge transfer complex is attached to a conductive filler in a resin by heating or at room temperature using a two-roll or three-roll machine or an injection molding machine.

This may be kneaded as described above. This method is more effective in improving uniformity.

Further, a conductive coating film can be obtained by mixing a conductive filler into an organic paint using a homomixer, dipper, ball mill, sand mill, etc., and applying this paint onto the surface of a base material. At this time, if a charge transfer complex is added and mixed at the same time as the conductive filler, the conductive resin of the present invention can be obtained, and the content of the conductive filler can be reduced.

<Effects of the Invention> The conductive resin of the present invention can significantly reduce the amount of conductive fibers contained in the conductive resin compared to conventional resins. For example, A in Table 2-1
If no charge transfer complex is added as shown in 12,
50 to make the surface resistance of the resin less than 1010rL70
2% by weight of a conductive filler is required, but if a charge transfer complex is added as in the present invention, a surface resistance of 3.XIO' can be obtained just by mixing 20% by weight of a conductive filler! > (Z) The amount of conductive filler mixed can be reduced to less than half.

Moreover, the amount of charge transfer complex added may be small. As described above, since the conductive resin of the present invention contains a small amount of inorganic substances (conductive filler and charge transfer complex) mixed into the resin, processability is not impaired. For example, even when resin is turned into fiber, it can be spun without clogging the nozzle.

Further, the present invention uses an oxide as the conductive filler. In particular, those using Al-Dawg zinc oxide, Sb-doped SnO, or coated titanium oxide are white, and when added to the resin, the color tone can be adjusted by adding other pigments or dyes. Therefore, the resin according to the present invention is suitable as a conductive coating 2 that requires white color, such as a conductive layer of electrostatic copying paper. Of course, it can be used for a wide range of other purposes.

<Examples and Comparative Examples> Example 1 Using acrylic paint (Kansai Paint, Acrylic) and toluene, the acrylic resin solidity was adjusted to 30%, and white conductive powder (Mitsubishi Metals actual product name W-) was added to the paint. 1 specific resistance 1
0 D t:N) and a charge transfer complex (Toho Chemical Co., Ltd. B
N-11) was added in a predetermined amount and mixed indirectly with a ball mill, and then placed on a polyester film with a thickness of approximately 50 μm (
After drying, apply to the following thickness.

Its surface resistance was measured. The results are shown in Table-1.

Example 2 The present invention was carried out under the same conditions as in Example 1 except that Zn oxide conductive powder (specific resistance 100Ac!!L manufactured by Honjo Chemical) was used as the conductive filler and BN-13 manufactured by Toho Chemical Industry was used as the charge transfer complex. was carried out. The results are shown in Table-2.

Example 3 Using the same conductive filler and charge transfer complex as in Example 1, this powder was kneaded with polypropylene (Mitsubishi Yuka BC-4) resin using two rolls. That is, the roll temperature is 1
After kneading the mixture at 60° C. for 7 minutes, it was molded into a 2-iot thick sheet and its surface resistance was measured. The results are shown in Table-3.

Claims (1)

[Claims] 1. Contains an oxide conductive filler and a charge transfer complex, and the charge transfer complex is 0.05 to 0.05 to the oxide conductive filler.
A conductive resin characterized by containing 30% by weight. 2. The conductive resin according to claim 1, wherein the charge transfer complex contains B and N. 3. The conductive resin according to claim 1, wherein the oxide conductive filler is titanium oxide having an Sb-doped SnO_2 coating or zinc oxide doped with Al.