JPH01297619A - Rubbing material - Google Patents

Abstract

PURPOSE:To unify the orientation of a liquid crystal, reducing difficulty caused by static electricity by using a material having a controlling or a conductive property for the rear of the rubbing material (the rear of a structure). CONSTITUTION:The material having the controlling or the conductive property is used for the rear surface of the structure. Rubbing is carried out with the surface of the structure. And the structure is composed of a fabrics, a knitting, a nonfabrics and a pile structure, etc. The fabrics comprises for example, a plain weave, a twilled weave and a satin elastic webbing, etc. The knitting comprises for example, a jersey and a sheeting, etc. The pile structure is a structure having a pile yarn, and is exemplified by for example, a pile fabric such as a velvet, a velveteen and a coated fabric, etc., a raising fabric and a flocked fabric, etc. Thus, the uniform orientation of the liquid crystal is obtd., and the generation of the static electricity is remarkably small, and the stable orientation of the liquid crystal is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rubbing material, and more particularly to a rubbing material having a static electricity removal effect.

[Conventional technology]

In recent years, due to the rapid development of the electronics industry, the display device market, centered on display devices in the computer peripheral terminal device market, has continued to grow rapidly as office automation, factory automation, etc. have entered the period of full-scale popularization.

Liquid crystal display devices are used as display devices in game computers, liquid crystal televisions, facsimile machines, telephones, watches, cameras, etc. In manufacturing liquid crystal display devices, it is most important to make the alignment of liquid crystals uniform. There is a rubbing method as a method for obtaining alignment of liquid crystal.

In the rubbing method, a polymer film such as 5i02, polyimide, or PVA is applied to the liquid crystal cell and the glass plate serving as the substrate, and a modified PVA is applied to the surface of the polymer film, such as polyester.

A nylon-epoxy-organotitanium film is used as an alignment film, and the glass plate and each alignment film are rubbed in one direction with a cloth or the like to obtain orientation.

Conventionally, cotton cloth, absorbent cotton, and synthetic fiber cloths such as polyester and nylon have been used as rubbing materials, but in the case of cotton threads and absorbent cotton, the short fibers of the cotton threads adhere to the substrate of the liquid crystal cell during rubbing. Furthermore, in the case of synthetic fiber fabrics such as polyester and nylon, static electricity is generated during rubbing, and dust and lint adhere to the substrate due to static electricity generation. As a result, disconnection or short-circuiting of the electrodes is induced, leading to uneven orientation of liquid crystal molecules, poor sealing, and short-circuiting between the segment electrodes and common electrodes, resulting in abnormalities in the liquid crystal display device. These defects cause the yield of liquid crystal display devices to be extremely poor.

[Problem to be solved by the invention]

The present inventors have completed the present invention as a result of extensive research into the compatibility of rubbing materials and liquid crystals, in view of the drawbacks of such rubbing materials.

An object of the present invention is to provide a rubbing material that can obtain uniform alignment of liquid crystal when rubbing a liquid crystal substrate, thereby eliminating the occurrence of defective products in liquid crystal display devices and the like.

[Means to solve the problem]

The present invention is a rubbing material characterized in that an antistatic or conductive material is used on the back surface of the structure, and the surface of the structure is rubbed.

The structures referred to in the present invention include woven fabrics, knitted fabrics, nonwoven fabrics, pile structures, and the like. Examples of textiles include plain weave, twill weave,
Sateen fabrics, knitted fabrics such as bajashii, jersey, etc., pile structures include structures with pile threads,
Examples include pile fabrics such as velveteen, corduroy, raised fabrics, and flocked fabrics, but the forms thereof are not particularly limited. However, in a pile structure, the rubbing surface is on the pile side. The material of the structure is polyester synthetic fiber, polyamide synthetic fiber,
These include, but are not limited to, cellulose acetate synthetic fibers, regenerated cellulose fibers (including polynosic), polyacrylonitrile synthetic fibers, glass fibers, polypropylene synthetic fibers, and polyethylene synthetic fibers.

The use of an antistatic or conductive material on the back surface of the structure of the present invention prevents the antistatic or conductive material having a resistivity of 109 ohms or less from being exposed on the surface of the structure. It means to use. For example, the structure may be made into a two-layer structure and antistatic or conductive fibers may be mixed in as the back thread, or a film or nonwoven fabric mixed with an antistatic or conductive material may be adhered to the back side of the two-layer structure. Examples of methods include back-coating the back surface of the layered structure with a resin mixed with an antistatic or conductive material. Examples of antistatic or conductive materials used in the present invention include metal fibers, carbon fibers, copper sulfide acrylic fibers, copper sulfide cellulose fibers, copper sulfide polyamide fibers, metal plating fibers, carbon, metal powders such as silver, copper, etc. etc., but is not limited to these. Further, the antistatic or conductive material may be mixed, blended, mixed, or twisted with other materials.

The rubbing material of the present invention has no relation to the material or form of the rubbing surface (the surface of the structure of the present invention) (or the anti-rubbing surface (
By using antistatic or conductive material on the back side of the structure, static electricity generated during rubbing can be quickly removed.
This prevents lint from adhering to the liquid crystal substrate, eliminates problems caused by static electricity, and evens out the alignment of the liquid crystal.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples. Note that the electrical characteristics of the examples were measured under the following conditions.

Measurement conditions: 20°C x 20% RH Frictional charging voltage: JIS-L-1094B method (friction cloth:
(Cotton cloth) (Frictional charging voltage when rubbing a liquid crystal board is based on JIS-L-1094 for a glass plate coated with polyimide resin.
It shows the frictional charging voltage when friction is applied according to method B. ) Half-life: JIS-L-1094A Method Example 1 Various nonwoven fabrics listed in Table 1 were dot-bonded with a hot melt adhesive onto the back side of a satin fabric using viscose method rayon yarn 150d150f for the warp and weft.

The electrical properties of the satin fabric are shown in Table 1.

The metal fiber composite nonwoven fabric shown in 11h2 of Table 1 below is made of polyolefin fibers and stainless steel fibers of 8 μm (specific resistance: lo-
Non-woven fabric with a basis weight of 40 g/g (specific resistance: lQ!
i ohm cm).

The copper sulfide cellulose fiber composite nonwoven fabric shown in column 3 of Table 1 contains polyolefin fibers and copper sulfide cellulose fibers of 4:
This is a 40 g/% non-woven fabric made by mixing 1 part of each. (Resistivity: 10' ohm senna meter).

The copper sulfide cellulose fiber (resistivity: 100 ohms/cm) was prepared using a known method with a cellulose concentration of 10% by weight, an ammonia concentration of 7% by weight, and a copper concentration of 3.6.
A cuprammonium cellulose solution having a composition of The temperature and flow rate of the spinning water used were 30°C and 1
51/min. Subsequently, the fiber surface was regenerated by passing it through a 1.4% by weight aqueous sulfuric acid solution for 0.3 seconds, and then it was cut into a length of 38 m with a cutter, thoroughly washed with water, and the cotton containing the coordination compound of copper cellulose ( (hereinafter referred to as the blue line) was obtained.

Next, it was immersed in an aqueous solution with a potassium sulfide concentration of 5% by weight and a temperature of 50° C. for 20 minutes, and then washed with water and dried to obtain copper sulfide cellulose short fibers (2 denier, fiber length 38 fins).

The copper sulfide acrylic fiber composite nonwoven fabric shown in column 4 of Table 1 is a nonwoven fabric with a basis weight of 40 g/mr made by mixing polyolefin fibers and copper sulfide acrylic fibers at a ratio of 4:1 (specific resistance: 106 ohms). ·Centimeter). Copper sulfide acrylic fiber (resistivity: 100 ohms) is made of copper sulfate (0.05 cm) made of cashmilon (niacrylic synthetic fiber manufactured by Asahi Kasei Corporation, 2 denier, fiber length 38 mm).
moβ/It') and sodium thiosulfate (0,45 mo
The fibers were immersed in an aqueous solution containing l/j, treated at 85° C. for 30 minutes, washed with water, and dried to obtain copper sulfide acrylic fibers.

As is clear from Table 1, the method of the present invention (Magnetic 2, Floor 3, N
No. 14) exhibited excellent antistatic properties, and no fibers were observed to adhere to the liquid crystal or substrate. However, l1h that does not use antistatic or conductive material on the back side of the satin fabric
1 generated a high amount of static electricity, and the alignment of the liquid crystal due to rubbing was not uniform.

Example 2 Polyester yarn 50d/24f was used as the pile yarn, velvet made of polyester yarn 50d/24f was used as the warp and weft of the ground yarn, and the pile length was 2. O
It was set as vr*.

On the back side of the velvet, 5% by weight of Boncoat R-3380-A (acrylic resin: manufactured by Dainippon Ink ■), 0% Sumitex Resin M-3 (melamine resin: manufactured by Sumitomo Chemical ■)
．． 3% by weight, 0.05% by weight of Sumitex Accelerator ACX (organic amine catalyst: manufactured by Sumitomo Chemical @) and 10% of carbon fiber (2 denier, fiber length 3n) (specific resistance: 10-1 ohm cm). Bank coating was performed using a resin solution containing % by weight.

For comparison, the back side of the same velvet as in Example 2 was back coated with the back coating resin liquid of Example 2 which did not contain carbon fiber.

The electrical properties of the velvet/metal are shown in Table 2.

Table 2 (Note) Friction was performed from the pile side.

As is clear from Table 2, the method of the present invention exhibits excellent antistatic properties, and the alignment of liquid crystals by rubbing is extremely uniform.
There was no adhesion of fibers to the liquid crystal or substrate. On the other hand, the comparative example had high static electricity, and the alignment of the liquid crystal due to rubbing was not uniform.

〔Effect of the invention〕

According to the rubbing material of the present invention, uniform orientation of the liquid crystal can be obtained when rubbing the liquid crystal cell and its substrate, so that there is no adhesion of fibers to the liquid crystal cell and its substrate during rubbing. The generation of static electricity is extremely low, and stable liquid crystal alignment can be obtained.

Agent: Patent Attorney Kawakita Takecho

Claims (1)

[Claims] (1) A rubbing material for rubbing the surface of a structure, characterized in that a material having antistatic properties or conductivity is used on the back surface of the structure.