JP2000208292A - Static electricity discharge sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To aerially discharge static electricity electrified to a sheet, and to check inverse charge from the other by laminating surface cloth to a base sheet by an adhesive blended with a conductive filler, and adjusting a surface resistance value to a specific value. SOLUTION: A static electricity discharge sheet 1 is constituted by sticking a base sheet 2 using foaming urethane foam as a material and surface cloth 3 by twilling polyamide fiber yarn by an adhesive 4 blended with conductive titanate alkaline metal salt. A surface resistance value of this static electricity discharge sheet 1 is adjusted so as to become 105 to 1010 Ω/square. Therefor, adding quantity of a conductive filler in the adhesive 4 is desirably set to 1 to 50 wt.% to the resin solid content of the adhesive. This static electricity discharge sheet 1 can be used for an operation mat of a mouse 5. When this static electricity discharge sheet is used by being set on a turntable of a record, an excellent rotary state can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic discharge sheet having a function of discharging static electricity while relaxing a potential gradient and preventing reverse charging.

[0002]

2. Description of the Related Art Computer mouse operation mats and turntable turntable mats are made slightly softer to improve the operability of the mouse and to enable the rotation of the turntable to be smoothly transmitted to the soundboard. I have to.

[0003] Further, when both are charged with static electricity, dust is adsorbed, and in the case of a mouse, operability is impaired, which may cause malfunction and eventually cause failure. Further, in the case of a turntable mat, static electricity is charged on the sound board, and there is a risk that dust will be attracted to the sound board, causing noise or damaging the sound board.

In order to solve the above problem, for example, Japanese Patent Laid-Open Publication No. Hei 7-129317 proposes a mat for a mouse in which conductivity is imparted to a mouse mat so that the charged static electricity is discharged to the ground.

[0005]

In the above proposal,
Although the charged static electricity can be discharged, when the external electric charge such as a desk is high, there is a possibility that the mat is reversely charged and charged.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, the present invention provides an appropriate volume specific resistance to a sheet so that static electricity charged on the sheet can be discharged by air and reverse charging from the other side can be prevented. An object of the present invention is to provide an electrostatic discharge sheet capable of smoothly performing operation and rotation of a sound board.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an adhesive containing a conductive filler, a surface cloth is adhered to a base sheet, and the surface resistance is set to 10 ^{5 to} 10 ¹⁰ Ω /. □ and the surface cloth is coated with a surfactant if necessary, or impregnated, or the surface cloth is twilled, and the fiber of the surface cloth is polyamide,
The base sheet is a foamed polyurethane. Further, the electrostatic discharge sheet configured as described above is used for a mouse pad or a turntable mat of a sound board.

According to the present invention having the above-described structure, a mouse pad and a turntable pad of a sound board can be smoothly discharged without attracting static electricity from the outside, and a mouse can be provided with appropriate flexibility. Operation and rotation transmission of the turntable are performed smoothly.

As the above-mentioned outer cloth, various fibers irrespective of natural fibers and synthetic fibers can be adopted, but polyimide (nylon) or the like is suitable in consideration of strength and abrasion resistance. In the weaving form, it is considered that the twill weave is suitable from the results of the mouse operability test.

[0010] Further, if a surface cloth is coated or impregnated with a surfactant, durability is improved, suitable friction characteristics are obtained, operability of a mouse is improved, and a sheet having a desired surface resistance value is obtained. It will be easier to obtain.

As the above-mentioned surfactant, for example, anionic surfactants such as phosphate esters, alkyl sulfonates, alkyl aryl sulfonates, and alkyl sulfates are suitable. The amount is determined according to the purpose from the range of the amount applied to. In addition,
The thickness of the outer cloth is 0.05 to 1 mm.

It is preferable to use a base sheet having a high frictional resistance so as not to slip between a desk and a turntable. The base sheet is made of urethane resin, acrylic resin, phenol resin, epoxy resin, butadiene-based synthetic resin. Rubber etc. can be mentioned, among which foamed polyurethane has good adhesion to desks etc., and it is easy to peel off, so it is suitable for mouse mats and turntable mats for sound boards,
The thickness is appropriately selected from the range of 0.5 to 10 mm.

The conductive filler added to the adhesive includes conductive powders such as carbon black, graphite, and various conductive metal oxides (tin oxide, titanium oxide, antimony oxide, etc.), carbon fibers, and metal oxides. Various conductive fibers such as short fibers, ceramic particles coated with a metal oxide, or fibers can be used. Among them, handleability,
In consideration of coloring properties, corrosion resistance, dispersibility, resistance to falling off of carbon, etc., a material in which metal oxide (tin oxide, antimony oxide) is coated on potassium titanate fiber or titanium oxide fiber (for example, Otsuka Chemical Co., Ltd.) Commercial product, trade name: DENTOL WK) can be suitably used. Further, a coating material in which the material is dispersed in a binder (for example, a commercial product of Otsuka Chemical Co., Ltd., trade name: TISTAT) may be used.

In order to adjust the surface resistance value of the electrostatic discharge sheet to 10 ^{5 to} 10 ¹⁰ Ωcm / □, the amount of the conductive filler to be added to the adhesive depends on the type of the adhesive used, the type of the conductive filler, and the surface cloth. And the thickness and the like of the base sheet. For example, when the commercially available conductive fiber (Denthol WK) is added to a general urethane-based adhesive, the amount is preferably 1 to 50% by weight based on the resin solid content of the adhesive.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes an electrostatic discharge sheet formed by laminating a base sheet 2 made of foamed urethane foam and a surface cloth 3 formed by twilling polyamide fiber yarns with an adhesive 4 containing a conductive alkali metal titanate salt. In the drawing, the electrostatic discharge sheet 1 is used as a mouse operation mat, and 5 is a mouse.

[0016]

[Example 1] Nylon twill woven fabric (Toray warp 110D)
× 20F, weft 210D × 34F, weave thickness ≒ 0.36mm
(D is denier, F is the number of yarns)) and a surfactant solution (trade name: ELENITE AB-100, manufactured by Takamatsu Yushi, 2 wt%
Aqueous solution of a phosphate ester surfactant)
After squeezing the pad, it was dried at 130 ° C. for about 24 hours by a dry baking method.

Next, the above-mentioned outer cloth is attached to a base sheet of polyurethane foam (trade name: ZULEN XF type, manufactured by Bridgestone Corporation, thickness: 1 mm) with an adhesive containing a conductive filler to obtain an electrostatic discharge sheet. The adhesive used here was a water-based urethane adhesive 90.
A mixture containing 10 parts by weight of a paint containing conductive titanium oxide fiber in parts by weight (commercially available from Otsuka Chemical Co., Ltd., trade name: Tistat-A (containing 40 wt% of a conductive alkali metal titanate)) was used. .

[0018]

Example 2 The electrostatic discharge sheet obtained in Example 1 was replaced with a 22 ×
It was cut into a rectangle of 18 (cm) to provide a mouse operation mat.

The mat was used for 5 months a day for 6 months, but the operability was good, there was no malfunction, and no stain on the mouse was observed. Further, when the stained mouse was used in the same manner, most of the stain was removed.

[0020]

Example 3 The electrostatic discharge sheet obtained in Example 1 was punched out into a disk having a center hole to obtain a turntable mat for a sound board.

When this mat was set on the turntable of the sound board and both sides of the LP record were listened to once, a favorable rotation state was maintained, and no dust was adsorbed on the sound board.

[0022]

As explained above, according to the present invention, by having an appropriate surface resistance value, it is possible to discharge static electricity charged on the mat by air and prevent reverse charging from the other having a high charge. In addition, effects such as smooth operation of the mouse and rotation of the sound board can be obtained with moderate flexibility.

[Brief description of the drawings]

FIG. 1 is a perspective view of a computer mouse mat according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 electrostatic discharge sheet (mouse pad) 2 base sheet 3 outer cloth 4 adhesive (adhesive layer) 5 mouse

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsunemi Miyajima No. 80, 6 Iwaji, Naruto-shi, Fuyo-cho (72) Inventor Fumiaki Hamamura 21 No. 21 Miyanohigashi, Kitahama, Naruto-shi 9F F-term (reference) 5B087 AA00 AA09 AC15 BB18 BB20 5G067 AA46 AA59 BA02 CA03 DA01

Claims (5)

[Claims] 1. An electrostatic discharge sheet prepared by bonding a surface cloth to a base sheet with an adhesive containing a conductive filler and adjusting the surface resistance to 10 ^{5 to} 10 ¹⁰ Ω / □. 2. The electrostatic discharge sheet according to claim 1, wherein the surface cloth is coated or impregnated with a surfactant. 3. The electrostatic discharge sheet according to claim 1, wherein the outer cloth is twill-woven. 4. The electrostatic discharge sheet according to claim 1, wherein the fibers of the top cloth are polyamide and the base sheet is polyurethane foam. 5. A mouse pad or a turntable mat for a sound board, formed by the electrostatic discharge sheet according to claim 1.