JPH0867837A - A coating material for forming UV-irradiation type transparent conductive film, which has excellent conductivity, abrasion resistance, and adhesion. - Google Patents

Abstract

PURPOSE: To prepare a coating material for UV-irradiation type transparent conductive film which contains a titanate bearing a specific group at a specific ratio as a coating film-modifier, and is useful in the field of computers because it is excellent in abrasion resistance, adhesion and electric conductivity without adverse effect on the transparency. CONSTITUTION: This coating material is obtained by adding (A) fine particles of an electrically conductive substance and (B) a binder and further (C) a titanate bearing dialkyl phosphite groups (preferably a compound of formulas I-III) in a proportion of 0.4-10wt.% based on the component (A). As a component A, for example, particles of indium oxide doped with tin of less than 0.2μm particle sizes are preferably used in addition to the powder of tin oxide doped with antimony.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material capable of forming a UV irradiation type transparent conductive film having excellent conductivity, abrasion resistance and adhesion.

[0002]

2. Description of the Related Art Conventionally, a UV irradiation type transparent conductive film is generally formed on glass, plastic, or film by coating, printing, spraying or the like.
To these UV irradiation type transparent conductive films, for example, as described in JP-A-5-239409, there is a coating material for forming UV irradiation type transparent conductive films which is prepared by mixing conductive fine powder and a binder in a solvent. It is used.

In addition, in the above-mentioned conventional coating material for forming a UV irradiation type transparent conductive film, tin oxide powder doped with antimony is known as conductive fine powder. Further, a siloxane-based polymer obtained by hydrolyzing and condensing tetraalkoxysilane as a binder, alcohols such as methanol, ethanol and isopropanol, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate and butyl acetate as a solvent. It is also known that a general siloxane-based polymer synthesis solvent or a solvent compatible with dispersion is used.

Further, if necessary, vinyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-metaacryloxypropyltrimethoxysilane and the like as coupling agents, benzyl dimethyl ketal and benzophenone as photosensitizers, It is also known that acetophenone, benzoin, benzoin methyl ether and the like are used.

[0005]

On the other hand, in recent years, the performance of computers, TVs, liquid crystal displays, touch panels, etc. has been remarkably improved, and accordingly, the image surface of cathode ray tubes used for them, the electrodes of displays, touch panels, etc. Further conductivity, wear resistance,
And the improvement of adhesion is required, but in the above paint, the conductivity of the coating film formed by this, abrasion resistance,
At present, it is not possible to satisfactorily meet these requirements due to insufficient adhesion.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, therefore, the present invention is for forming a coating type transparent conductive film having excellent wear resistance and adhesiveness, as well as improved conductivity. As a result of conducting research to develop the above coating composition, a titanate agent having a new dialkylphosphite group in the conventional coating composition for forming a UV conductive transparent conductive film, preferably a titanate represented by the above Chemical Formulas 1 to 3 is used. A coating material for forming a UV irradiation type transparent conductive film, which contains 0.4 to 10% by weight (hereinafter,% means% by weight unless otherwise specified) in a ratio with respect to the conductive fine powder, achieves the above object. We obtained the optimum research results.

The present invention was made based on the above research results, and is a coating material for forming a UV irradiation type transparent conductive film, which is prepared by mixing conductive fine powder and a binder in a solvent. A titanate agent having a dialkyl phosphite group is used as a modifier at a ratio of 0.4 to 0.4 to the conductive fine powder.
Abrasion resistance, adhesion, characterized by containing 10%
And a coating material for forming a UV irradiation type transparent conductive film having excellent conductivity.

In the coating material for forming the UV irradiation type transparent conductive film of the present invention, the titanate agent having a dialkylphosphite group added as a coating film modifier is 0.4 to 10% in a ratio to the conductive fine powder. The reason for this is that if the content is less than 0.4% or more than 10%, the desired excellent conductivity, abrasion resistance, and adhesion cannot be secured.

As the conductive fine powder of the coating material for forming the UV irradiation type transparent conductive film of the present invention, in addition to the conventionally known antimony-doped tin oxide powder, for example, the particle diameter is 0.2 μm. It has been found that more preferable results are obtained by using the following tin-doped indium oxide, or that it is also effective to use zinc oxide whose conductivity is imparted by a doping agent. It also has better wear resistance,
And, in order to develop adhesion, a siloxane-based polymer (hereinafter referred to as a binder) obtained by hydrolyzing and condensing a tetraalkoxysilane is used as a binder, and the addition ratio (hereinafter, referred to as a binder addition ratio) is When the amount of the binder is expressed as the amount of siloxane contained in the binder in terms of SiO ₂ , the binder addition ratio = (amount of conductive fine powder) / (amount of binder) = 95/5 to 10 / It is preferable to add and use an amount within the range of 90.

[0010]

EXAMPLES Hereinafter, the coating material for forming the UV irradiation type transparent conductive film of the present invention will be described with reference to examples. 9 by weight as solvent
A mixed solvent of 8: 2 ethanol and butanol (hereinafter referred to as a mixed solvent) and methyl ethyl ketone were used as conductive fine powders having an average particle diameter of 0.025 μm.
Sb: A tin oxide powder containing 10 atomic% (hereinafter referred to as ATO powder) and indium oxide powder containing Sn: 5 atomic% (hereinafter referred to as ITO powder) were used as binders to bond a siloxane polymer synthesized by the following production method. Binder Synthesis Solution 1 and Binder Synthesis Solution 2 Containing Agent 1 and Binder 2
A titanate agent having a dialkylphosphite group having the composition of Chemical Formulas 1 to 3 was prepared as a coating film modifier, and methoxysilane having the following Chemical Formulas 4 and 5 was prepared as a coupling agent.

[0011]

[Chemical 4]

[0012]

[Chemical 5]

As the binder synthesis liquid 1, a 500 ml four-necked flask made of glass was used, and tetraethoxysilane: 1 was used while flowing dry nitrogen at a flow rate of 30 ml / min.
40 g and ethyl alcohol: 240 g were added, and pure water: 5
Maleic acid dissolved in 0 g: 1.5 g with stirring 1
Drop by time and then react at 70 ° C for 4 hours to react with SiO 2
Binder synthesis liquid 1 containing 9.1% of binder 1 in terms of conversion was produced. Similarly, as the binder synthesis liquid 2, a 500 ml four-necked flask made of glass was used, and 140 g of tetraethoxysilane and 240 g of ethyl alcohol were added, and 12 N-HCl: 1.0 g dissolved in pure water: 25 g. Was added all at once with stirring, and then the mixture was reacted at 80 ° C. for 6 hours to similarly prepare a binder synthesis liquid 2 containing 9.6% of the binder 2 in terms of SiO ₂ .

Next, the conductive fine powder, the binder synthesis solution, the solvent, the coupling agent, the photosensitizer and the raw material of the coating film modifier are blended and mixed in the proportions shown in Table 1 to prepare the coating composition of the present invention. 1 to 13 and conventional paints 1 and 2 were produced. The binder addition ratio was calculated from the conductive fine powder compounding ratio and the binder synthetic liquid compounding ratio to obtain the values shown in Table 1.

With respect to the coating materials 1 to 13 of the present invention and the conventional coating materials 1 and 2 obtained as a result, these are coated on a glass substrate (thickness 2).
mm, visible light transmittance measurement value: 91%, haze measurement value: 0
%) And dried at 100 ° C., then 5,000 mJ
A transparent conductive film was obtained by irradiating with UV of / cm ² . For each transparent conductive film obtained as a result, first, for the purpose of evaluating transparency, a spectrophotometer was used to measure 550 nm.
The visible light transmittance was measured, then the haze was measured using a haze meter, and the surface resistance was measured by the 4-probe method for the purpose of evaluating conductivity, and the results shown in Table 2 were obtained. Furthermore, a stroke width of 5 cm, 1 k is used with an eraser (Lion 50-50) for the purpose of evaluating abrasion resistance and adhesion.
Reciprocating friction under g load, 200 times, 400 times, and 600 times reciprocating friction, and measuring the haze in the same manner. Change in haze of coating film before and after rubbing: Table 2 for ΔH The results shown in are obtained.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

From the results shown in Table 2, the coating material of the present invention 1
Nos. 13 to 13 are UV excellent in abrasion resistance, adhesion and conductivity without impairing transparency as compared with the conventional paints 1 and 2.
It is clear that an irradiation-type transparent conductive film can be formed.
If it is applied to the RT surface, the antistatic effect can be maintained over a long period of use, and if it is used on the surface of the touch panel, accurate input can be performed over a long period of time.
Furthermore, if the coating material of the present invention is used, it is possible to manufacture electrodes of a high-definition liquid crystal display by a coating method, so that its industrial effect is extremely large.

Claims (4)

[Claims] 1. A coating material for forming a UV irradiation type transparent conductive film, which is prepared by mixing a solvent with conductive fine powder and a binder,
The coating material contains a titanate agent having a dialkylphosphite group in an amount of 0.4 to 10% by weight based on the conductive fine powder.
A coating material for forming a UV irradiation type transparent conductive film, which comprises: 2. A coating material for forming a UV irradiation type transparent conductive film according to claim 1, wherein the titanate agent having a dialkyl phosphite group has the following chemical formula 1. Embedded image 3. The coating material for forming a UV irradiation type transparent conductive film according to claim 1, wherein the titanate agent having a dialkyl phosphite group has the following chemical formula 2. Embedded image 4. A coating material for forming a UV irradiation type transparent conductive film according to claim 1, wherein the titanate agent having a dialkyl phosphite group has the following chemical formula 3. [Chemical 3]