JPS6058850A - Transparent conductive film having improved abrasion resistance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive film having a transparent conductive layer and improved abrasion resistance.

In general, plastin is widely used in molded products and films due to its excellent physical and plastic properties, but it also has high electrical resistance.

Due to friction, etc., it is easy to become charged with static electricity, which causes obstacles for the gods.

In particular, integrated circuit devices (■C), which have become increasingly susceptible to hemorrhoids in recent years, suffer from problems such as static electricity of several hundred volts destroying their internal circuits and resulting in defective products. Boxes and other materials must have good electrical conductivity.

Conventionally, methods for imparting conductivity to plastic films include (1) applying various surfactants to the entire surface or adding them internally;

(2) A thin film of gold (gold)A is formed on the surface.

■) Internally add conductive charging materials such as carbon black and metal fibers.

(4) Apply M-conducting paint to the surface.

However, the film produced by the method of surface coating or internal addition of the surfactant (υ) is as follows.

The resistivity of the viewing surface is approximately 1010Ω or more, and it is used for applications that do not require a high degree of conductivity.

In addition, films produced by the method (2) above in which a metal thin film is formed on the surface have excellent transparency and conductivity, such as a film in which gold is vacuum-deposited.
Due to its extremely high price, it is not used for general purposes and is used for special purposes.

Unfortunately, the film produced by the method of internally adding conductive filler material in (8) above has excellent conductivity, but is opaque, and when processed into two bags, the contents cannot be clearly seen. It has the following disadvantages.

In addition, the film produced by the method described in (4) above, in which the entire surface is coated with conductive paint, has the same conductivity as in (3) above, but the film that is coated with ordinary conductive paint,
It is opaque. However, the conductive filler in the paint has a particle size of 0.
When the conductive fine powder is 4 μm or less, that is, when the particle size is smaller than the long wavelength of the visible light, there is little light scattering and the decrease in transparency due to the thin film layer containing the conductive fine powder is small. It is known that when the thickness of the thin film layer is small, it has a virtually transparent effect.

That is, a film made by coating and drying a paint made of conductive metal fine powder with a particle size of 0.41 tm or less and a resin can be made into a film that is transparent and has excellent conductivity.

However, the conductive layer of the paint (if the fat component is soluble in an organic solvent +1, the resulting conductive layer) has poor dissection resistance, and the friction causes conductive fine particles to form. may fall off and cause trouble.

Further, the layer between the base film and the conductive layer becomes a non-light-emitting component.

The inventors of the present invention have conducted intensive research to improve these problems and have arrived at the present invention.

In other words, a coating VI containing a tri fat and a polyisocyanate compound having active hydrogen of 2 volume ratio or more (5 (1 volume ratio or less and a remainder of 2 or more) with a particle size of 0Φ or less) is applied. - By drying, it was possible to obtain a transparent LY1 conductive film with improved abrasion resistance.

Specific examples of metal compounds that can be used as conductive fine powders in the present invention include first-order metal compounds. Antimony ↑↑ Metal oxide fine powder such as tin oxide, aluminum-containing 4f lead oxide, and Nj.

Cu, Co, Ag, etc.? ; genus fine powder.

In addition, resins containing two or more active hydrogens that can be blended with the conductive fine powder include polyester resins such as urethane-modified polyester, polyether resins such as urethane-modified polyether, polyol-based resins, polythiol-based resins, and polyamine-based resins. Resins containing two or more active hydrogens can be used, but among them, those soluble in ethyl acetate, toluene, methyl ethyl ketone, etc., and mixed solvents thereof, which are commonly used in paints and coatings, are preferred.

As the polyincyanate compound, a compound having two or more incyanate groups, such as an addition product of 3 moles of toluene diisocyanate and 1 mole of trimethylolpropane, can be used.

Dimensions. The solvent used to manufacture the coating liquid is ethyl acetate.

Toluene, methyl ethyl ketone, and other regular paints＼ The M solvent used in the production is used.

In addition, the base material glass film is polyester, polyolefin, and polyamide.

Films made of IJQ vinyl, polyvinyl alcohol, etc. can be used.

In addition, the methods of applying coating liquid on the film are Mayer bar coating and gravure coating.

Spray coating or other suitable methods are possible.

Next, the present invention will be explained using 11 real examples, but these are just 9 illustrative examples and the present invention is not limited thereto.

The conductivity (surface resistivity), transparency, and cross-friction properties shown in the examples were measured using the laminated films as samples in the following manner.

(1) Conductivity (Surface specific resistance) Sample film 4 PC@surface], 0x50 area 9 rectangular electrodes weighing 2502 mm were placed 10 mm apart, and the lead wires were used to connect the tester (Nichijo).

Using a digital high tester (Model 3205), one reading of low resistance was taken, and a value five times that value was taken as surface specific resistance (2).

■) Transparency The total light transmittance is determined by the parallel light transmittance measurement method specified in JIS K-(5714).
Measurement was carried out using Model 37.

(8) After applying and drying the abrasion-resistant sample film 4. (+ "CX After aging for Z days, the surface of the conductive layer was rubbed 100 times at a load of 200 g using a dyeing rub fastness tester in accordance with JIS L-0849, and then the above (1) Measure the surface resistivity of the frictional part using the method described above, and evaluate the rate of increase in surface resistivity due to friction. After pasting for a length of 0t-rn, pinch one end with your fingertips and peel off quickly. The evaluation is based on the area of the conductive layer thin film adhered to the tape surface.

O...No thin film adhesion Δ...Partial adhesion ×...Example in which it adheres to the entire surface l Commercially available conductive +l fine powder paint (Syntron manufactured by Shinto Paint Co., Ltd.) C-4.4.01. Solid content concentration 45% by weight, antimony-containing tin oxide conductive fine powder 71% in the same form, remainder +ifM polyester resin) l (for 10 parts, polyester resin) A coating solution to which 3 parts of trimethylolpropane/toluene diisocyanate 3 mole adduct was added as a cyanate compound was diluted to a solid content of about 15% [and then coated on a di-Il+ stretched polypropylene film using a Mayer bar. Then, it is dried using an explosion-proof dryer.
A conductive film was obtained. About this film conductive,
transparency.

Friction resistance and noise resistance between the conductive layer and the Jζ material were evaluated.

The results are shown in Appendix Table 1.

From the above results, it was found that the obtained transparent conductive film had excellent abrasion resistance and adhesiveness. Comparative Example 1 A coating liquid without adding a polyisocyanate compound was prepared in the same manner as in Example 1. A conductive film was created. About this film: conductive and transparent.

Abrasion resistance and adhesion were evaluated. The results are shown in Appendix Table 1.

From the above results, it was found that the abrasion resistance and dense layer property of the material without the addition of a polyincyanate compound were non-luminous.

[Margin below]

Claims (1)

[Claims] 1 Apply and dry a coating liquid containing a resin and a polyincyanate compound having conductive metal fine powder with a particle size of 0.41 or less and a volume of 2 or more and 60 or less and a residual active hydrogen of 2 or more. Improved abrasion resistance characterized by
, a transparent conductive film.