JPH02269178A - Antistatic film and production thereof - Google Patents

Abstract

PURPOSE:To obtain the title firm film with low electrical resistance by coating the surface of a substrate with a liquid containing a specific organic conductor followed by heating, i.e. heat treatment at low temperatures (ca.150 deg.C). CONSTITUTION:The surface of a substrate is coated with a liquid containing an organic conductor consisting of 7,7,8,8-tetracyanoquinodimethane complex salt followed by heating to obtain the objective film. It is preferable that this liquid be put to spray coating on the substrate followed by heating to form asperities on the surface for antireflective effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an antistatic film applied to the surface of a substrate such as a cathode ray tube panel.

[Prior Art] Since cathode ray tubes are operated at high voltage, static electricity is induced on their surfaces when they are started up or shut down.

This static electricity often causes dust to adhere to the surface, causing a reduction in contrast, or causing discomfort due to a mild electric shock when directly touched.

In the past, many attempts have been made to apply antistatic films to the surface of cathode ray tube panels in order to prevent the above-mentioned problems. For example, as described in JP-A No. 63-76247, a method has been adopted in which the surface of a cathode ray tube panel is heated to about 350 DEG C. and a layer of conductive oxides such as tin oxide and isodium oxide is formed by CVD. However, in addition to the equipment cost involved in this method, since the cathode ray tube is heated to a high temperature, the phosphor inside the cathode ray tube may fall off.
There were problems such as a decrease in dimensional accuracy.

Furthermore, tin oxide is the most common material used for the conductive film, but in this case it has the disadvantage that it is difficult to obtain a high-performance film with low-temperature treatment.

[Problems to be Solved by the Invention] The present invention aims to eliminate the above-mentioned drawbacks of the prior art, and aims to provide a new high-performance antistatic film that can be heat treated at low temperatures. It is something to do.

[Means for Solving the Problems] That is, the present invention has been made to solve the above-mentioned problems. The present invention provides an antistatic film characterized by forming a film containing:

The 7,7,8.8 tetracyanoquinodimethane (hereinafter abbreviated as TCNQ) complex salt used in the present invention is an electron donor.
various salts which are and TCN which is an electron acceptor (acceptor)
It is a type of organic conductor consisting of Q.

As a donor, isoquinolinium substituted with an alkyl group (1 to 5 carbon atoms) at the N position, particularly N-n-propylisoquinolinium, N-1so-propylisoquinolinium,
N-n-butylisoquinolinium and the like are preferred.

Further, pyridine, benzothiazole, acridine, phenazine, phenanthridine, quinoline, α-naphthoquinoline, β-naphthoquinoline, etc. in which the N-position is substituted with a hydrocarbon group can be suitably used.

Various methods can be considered for preparing the antistatic film coating solution using the above substances, including 1) a method in which a solution of TCNQ salt dissolved in a polar solvent is applied onto a cathode ray tube, and then heat treatment is performed.

2) A method in which TCNQ salt is made into fine crystals using a ball mill, etc., and dispersed in alcohol, etc., and the solution is applied onto a cathode ray tube, followed by heat treatment.

can be mentioned.

As the coating method, conventionally used methods such as spin cord, dip coating, spray coating, etc. can be suitably used. In addition, an anti-glare effect may also be imparted by spray coating to form irregularities on the surface. In this case, a hard coat such as a silica film may be provided on the product of the present invention, which serves as an anti-glare antistatic film. Furthermore, a non-glare coat of a silica film having an uneven surface may be provided by spray coating on the antistatic film of the present invention.

Similarly, on the antistatic film of the product of the present invention, TCN such as magnesium fluoride (MgF*), silica (Sin, ), etc.
It is also possible to obtain an antistatic film with low reflection due to the multi-1 interference effect by coating the film with a liquid containing a material having a lower refractive index than the film made of Qi salt so as to have an appropriate optical thickness.

The solvent for the coachib liquid is not particularly limited, but water,
Aqueous solutions, alcohols, esters, ethers, or organic high dielectric constant solvents such as dimethylformamide (hereinafter abbreviated as DMF), propylene carbonate, and γ-butyrolactone can be used.

Further, the content of the TCNQ complex in the liquid is preferably 1 to 30 ωt%.

Furthermore, in order to improve the adhesion strength and hardness of the film, 5i(OR)-R4-(X: 3.4, R: alkyl group) or the like may be added to the liquid containing TCNQ 1 used in the present invention as a binder. to deposit 5ins at the same time,
Various surfactants can be used to improve wettability with the substrate, and for example, sodium linear alkylbenzene sulfonate, alkyl ether sulfate, etc. may be added.

As the substrate on which the antistatic film of the present invention is formed, various glasses and plastic substrates such as cathode ray tube panels, copying machine glass plates, instrument panels, clean room glass, front plates of display devices such as CRTs and LCDs can be used. I can do it.

Furthermore, particles of zirconia or titanium oxide may be mixed into the liquid containing the TCNQ complex in order to improve the film properties.

[Example] Examples and comparative examples will be described below.

Example 1 N-n-butylisoquinolinium (TCNQ) a complex salt is dissolved in DMF at 6% by weight, and ethanol is added to the solution to dilute it twice.

Apply this liquid to the surface of the cathode ray tube panel using the spin code method.
The coating was applied for 5 seconds at 0 rpm, and then heat treated at 150° C. for 30 minutes to obtain a film with a thickness of about 100 nm.

The surface resistance of this coated film was measured, and the surface of the film was rubbed 100 times using a commercially available eraser under a load of 1 kg, and the presence or absence of peeling of the film was visually observed.

The results are shown in Table 1.

Example 2 The same procedure as in Example 1 was carried out except that a complex salt of N-n-propylisoquinolinium (TCNQ) was used.

Example 3 β-naphthoquinoline (TCNQ)1. The same procedure as in Example 1 was conducted except that 3% by weight of the s-complex salt was added to ethanol and the mixture was dispersed by rotation in a ball mill for 5 hours.

Example 4 Ethyl silicate and β-naphthoquinoline (TCNQ)+
, +s complex salts were added in ethanol in an amount of 3% by weight at a weight ratio of 1:1, but the same procedure as in Example 3 was used.

Example 5 The same procedure was carried out except that the solution of Example 1 was used and the coating was sprayed. 1. The glare on the film surface was visually observed from a distance of 1 m from the film surface and compared with those of Examples 1 to 4. Furthermore, surface roughness (Rz) and average surface roughness (Rav) were measured using a surface roughness meter.

Example 6 Using the solution of Example 1, the same procedure was carried out except that spray coating was performed. A butanol solution of ethyl silicate was applied onto the formed film using a spin code method and heated at 200°C for 40 minutes to form a hard coat. Formed. The glare, Rz, and Rav of the film surface were also measured.

Example 7 The procedure was carried out in the same manner as in Example 1, and a butanol solution of ethyl silicate was spray applied onto the formed film at 200°C.
An antireflection film was formed by heating for 40 minutes. The glare, Rz, and Rav of the film surface were also measured.

Example 8 The process was carried out in the same manner as in Example 1, and an ethanol solution containing a low refractive index material MgF* (solid content 3% by weight) was applied onto the formed film using a spin cord method and heated at 200°C for 30 minutes. A film was formed by heating for a minute.

In this case, the lower film has a central wavelength of approximately 555n+ in the visible light range.
With respect to n, the optical film with a wavelength of about 1100 nm has a refractive index of about 1.55, and the MgFi film has the same thickness of about 1100 nm and has a refractive index of about 1.37.

Comparative Example 5n (j2, 1.06 g dissolved in 20 g of ethanol) was used in the same manner as in Example 1.

In addition, Rz and Rav of Examples 1 to 4 and Comparative Example were smaller than the resolution of the measuring instrument and could not be measured because the membranes had smooth surfaces.

Table 1 [Effects of the Invention] According to the present invention, a strong antistatic film having low resistance can be easily obtained by low-temperature heat treatment at about 150° C., which could not be obtained with the prior art.

Claims (9)

[Claims] (1) An antistatic film characterized in that a coating containing an organic conductor made of a 7,7,8,8 tetracyanoquinodimethane complex salt is formed on the surface of a substrate. (2) On the surface of the substrate, the N position is an alkyl group (1 to 5 carbon atoms).
1. An antistatic film comprising an organic conductor made of a complex salt of isoquinolinium substituted with 7,7,8,8 tetracyanoquinodimethane. (3) An antistatic film characterized in that a film mainly composed of silica formed on the surface of a substrate contains an organic conductor made of a 7,7,8,8 tetracyanoquinodimethane complex salt. (4) Production of an antistatic film characterized by forming a film by coating a substrate surface with a liquid containing an organic conductor made of a 7,7,8,8 tetracyanoquinodimethane complex salt and heating it. Method. (5) On the surface of the substrate, 7,7,8,8 tetracyanoquinodimethane complex salt and general formula Si(OR)_x・R_4_-_x
Applying a solution containing (x = 3, 4, R; alkyl group),
A method for producing an antistatic film, which comprises forming a film by heating. (6) Spray a liquid containing an organic conductor consisting of a 7,7,8,8 tetracyanoquinodimethane complex salt onto the surface of the substrate and heat it to form a coating with irregularities on the surface for antireflection effect. An antistatic film characterized by: (7) A coating in which a liquid containing an organic conductor consisting of a 7,7,8,8 tetracyanoquinodimethane complex salt is spray-coated on the surface of the substrate and heated to form irregularities on the surface for an antireflection effect. An antistatic film characterized by having a scratch-resistant hard coat formed thereon. (8) Apply a liquid containing an organic conductor consisting of a 7,7,8,8 tetracyanoquinodimethane complex salt to the surface of the substrate, and then heat it to form an anti-reflection coating with an uneven surface. An antistatic film characterized by forming a film. (9) A liquid containing an organic conductor consisting of a 7,7,8,8 tetracyanoquinodimethane complex salt is applied to the substrate surface, and a liquid containing a low refractive index material is applied on the coating formed by heating. An antistatic film characterized in that a low refractive index film is formed by coating and heating.