JPS61268438A - Damp-proof film - 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] [Industrial Application Field] The present invention is applied to structures whose performance is extremely degraded by moisture intrusion, such as electroluminescent lamps, and which improves the performance of the structure by blocking the external atmosphere. This invention relates to a moisture-proof film for contributing to maintenance.

[Conventional technology 1] This type of moisture-proof film has an original moisture-proof function in order to make structures visible from the outside, and in the case of electroluminescent lamps, to enable external display by emitting light. It is required to have excellent transparency, and to meet this requirement, TEHA, polychlorotrifluoroethylene films, etc. have been used as particularly suitable films.

An example of the use of such a moisture-proof film will be explained using FIG. 3 in which it is applied to an electroluminescent lamp. In the figure, a base film 2 made of polyethylene terephthalate, etc.
1. A light-emitting layer 22 is formed on the conductive layer 21B side of a transparent conductive film 21 in which a transparent conductive layer (display electrode side transparent electrode) 21B is provided on A, and a conductive layer 24 (rear electrode ) are stacked on top of each other to form the basic structure 25 of the electroluminescent lamp.
6, and the periphery of both films is covered with an adhesive layer 2.
7 and sealed.

[Problem that the invention seeks to solve]

However, as mentioned above, the moisture-proof film is constructed separately from the internal structure, and is applied to the outer periphery of the structure to form an integrated product. This positional shift has the drawback of causing failure in adhesive sealing around the moisture-proof film.

Moreover, in structures such as electroluminescent lamps, which have a multi-layered structure, applying a moisture-proof film increases the number of laminated layers, which makes manufacturing such as electroluminescent lamps complicated. I just couldn't escape it.

Therefore, this invention provides a moisture-proof film with a new structure that has both the original function of a moisture-proof film and one of the functions of a structure to be moisture-proofed, that is, it has both the function of a moisture-proof film and the function of a structure. The purpose of this development is to solve the above-mentioned conventional problems.

[Means for solving problems]

As a result of intensive studies to achieve the above object, the inventor discovered that the transparent conductive film 21, which is one of the materials constituting the basic structure 25 of the electroluminescent lamp,
B and a base film 21A, and we focused on the fact that this base film 21A is not a particularly necessary material for exhibiting the function of the electroluminescent lamp, but merely serves as a support for the conductive layer 21H. , this base film 21. If the conventional moisture-proof film is used instead of A, a moisture-proof film having both moisture-proof and conductive functions can be obtained, and when this film is applied to the electroluminescent lamp, all of the problems mentioned above can be solved. This led me to complete this invention.

That is, the present invention relates to a moisture-proof film with a new structure that is highly effective in application to electroluminescent lamps and the like, and its gist is a moisture-proof film characterized by forming a transparent conductive layer on one side of the transparent moisture-proof film.

[Structure and operation of the invention] This invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 shows an example of the moisture-proof film of the present invention, where 1 is a transparent moisture-proof film and 2 is a transparent conductive layer formed on one side of the film 1. The transparent moisture-proof film 1 is made of a polymer film with high transparency and low water vapor permeability, and polychlorotrifluoroethylene is usually used. In addition, a butyl rubber film, a composite film of a polyethylene terephthalate film and a butyl rubber film, a high-density polyethylene film, a polyamide film, etc. can also be used. The thickness of this transparent moisture-proof film 1 is generally about 50 to 300 p.

Further, the transparent conductive layer 2 may include indium oxide, tin oxide, a mixture of indium oxide and tin oxide, gold, silver, copper,
It is made of aluminum, palladium, platinum, or the like, and is transparent in the visible light region and conductive, and usually has a thickness of about 50 to 1,0 OOA.

Such a transparent conductive layer 2 is formed by a known method such as a vacuum evaporation method, a sputtering method, or an ion blasting method. For example, in the sputtering method, the transparent moisture-proof film 1 is used as a substrate, and argon gas or After introducing a gas containing oxygen gas and adjusting the degree of vacuum to a predetermined degree, a direct current voltage is applied to generate glow discharge and sputtering is performed for a predetermined period of time, resulting in a surface resistance of 100~
A transparent conductive layer 2 having a resistance of about 500Ω/hole is easily formed.

FIG. 2 shows an example in which the moisture-proof film shown in FIG. 1 is applied to an electroluminescent lamp. In the figure, 3 is the moisture-proof film consisting of a transparent moisture-proof film 1 and a transparent conductive layer 2;
4 is a light emitting layer made of a phosphor and a polymer binder, 5 is a reflective insulating layer, 6 is a back electrode layer made of aluminum foil, copper foil, etc., and 7 is a moisture-proof film made of the same material as transparent moisture-proof film 1. The periphery of this moisture-proof film 7 and the moisture-proof film 3 are adhesively sealed with an adhesive layer 8 previously formed on the entire surface of the moisture-proof film 7.

Note that the light emitting layer 42 reflective insulating layer 5. The back electrode layer 6 and the moisture-proof film 7 are not particularly different from conventional ones. For example, the phosphor constituting the light-emitting layer 4 may include a base agent such as zinc sulfide, zinc selenide, or a mixed crystal of zinc sulfate and cadmium sulfide, and an activator consisting of a metal powder such as copper, silver, gold, or manganese; It is made of a mixture of activators such as halogen, aluminum, and gallium, and various resins such as cellulose resin, fluororesin, epoxy resin, and unsaturated polyester resin are used as the polymer binder. Further, the reflective insulating layer 5 is made of a polymer binder similar to the above-described polymer binder or a binder containing barium titanate, titanium oxide, etc., as desired.

The thickness of these components is also the same as that of the conventional one, for example, the thickness of the light emitting layer 4 is about 20 to 100 μm, and the thickness of the reflective insulating layer 5 is about 10 to 5 μm.
0/in1 back electrode layer 6 approximately 01~], QQ)n
U1 moisture-proof film 7 is about 50-300. Of course, these thicknesses may be set outside the above range.

The electroluminescent lamp having the above configuration is manufactured, for example, as follows. First, the moisture-proof film 3 of the present invention is cut into, for example, a rectangular shape that matches the size of the electroluminescent lamp, and the peripheral portion of the transparent conductive layer 2 in the film 3 is removed by etching as shown in the figure, and then the remaining portion is removed. - Apply the luminescent layer 4 on the conductive layer 2 by screen printing.

On the other hand, a reflective insulating layer 5 is applied on the back electrode layer 6 by screen printing, and this is heat-pressed to the moisture-proof film 3 so that the insulating layer 5 and the light emitting layer 4 are in contact with each other. After that, a moisture-proof film 7 having an adhesive @8 is attached to the back electrode layer 6 side, and the peripheral part is attached to the moisture-proof film 3.
Glue with.

The electroluminescent lamp produced in this manner has a structure in which the transparent conductive layer 2 of the moisture-proof film 3 constitutes the transparent electrode on the display electrode side facing the back electrode layer 6, and the use of the conventional transparent conductive film is eliminated. Therefore, the structure is simplified and the manufacturing process is advantageous. In particular, since the luminescent layer 4 is coated on the moisture-proof film 3 and the counter electrode side is superimposed on this, when covering and sealing with the moisture-proof film as seen in the conventional structure shown in FIG. positional shift is suppressed,
This has the advantage that adhesive sealing can be performed more reliably.

In the above example, when producing the electroluminescent lamp, the peripheral portion of the transparent conductive layer 2 in the moisture-proof film 3 is removed by etching, but this removal is not necessarily necessary. Further, the moisture-proof films 3 and 7 may be bonded together by other means such as heat fusion instead of using the adhesive layer 8.

Furthermore, the operation of the electroluminescent lamp configured as described above is as follows:
This can be done in the same way as before, and by applying a predetermined voltage between the transparent conductive layer 2 and the back electrode layer 6, the phosphor in the light emitting layer 4 is excited and emits light, and this light emission is transmitted to the moisture-proof film. It can be displayed externally via 3.

[Effects of the Invention] As described above, the moisture-proof film of the present invention has both a moisture-proof function and a conductive function, consisting of a transparent moisture-proof film and a transparent conductive layer, so it can be applied to an electroluminescent lamp. By configuring the transparent conductive layer as the transparent electrode on the display electrode side, it is possible to manufacture an electroluminescent lamp that is simpler than conventional structures and is less likely to be misaligned during adhesive sealing.

Furthermore, the moisture-proof film of the present invention is not limited to the above-mentioned electroluminescent lamp, but can be applied to any structure to be sealed with a moisture-proof film that requires a transparent conductive layer as a component thereof. It is possible to achieve similar effects. Furthermore, in some cases, it can be effectively used as a moisture-proof film with excellent moisture-proof properties even for structures that do not include a transparent conductive layer as an essential component.

[Examples] Below, examples of the present invention will be described in more detail.

On the substrate holder of the sputtering equipment,
An alloy target made of 90% by weight of metallic indium and 10% by weight of tin was attached onto the sputtering electrode. 10P
After vacuuming up to a, argon gas is heated to 100C.
C/min, oxygen gas flowing at 15cc/min, 4X1
It was maintained at 0 Pa.

By applying a direct current voltage of 400 V to the sputter electrode to generate glow discharge and performing sputtering for 30 seconds, a transparent conductive layer made of indium oxide and tin oxide is formed on the polychlorotrifluoroethylene film set on the substrate holder. was formed. This transparent conductive layer has a
It had a surface electrical resistance of Ω/mouth and a thickness of 300.

Using the thus obtained moisture-proof film of the present invention, an electroluminescent lamp having the structure shown in FIG. 2 was produced by the following method. That is, first, the moisture-proof film was cut into a rectangle having a predetermined size, and the transparent conductive layer around the cut-out was removed by etching. A phosphor paste (40 parts each of copper-infused zinc sulfide, cyanethylated cellulose and dimethylformamide, 1 part each) was then applied onto the remaining transparent conductive layer.
A paste (mixed as 0 parts and 50 parts) was applied by screen printing and dried to form a 40 μm light-emitting layer. On the other hand, a dielectric paste (a paste prepared by kneading barium titanate, cyanoethylated cellulose, and diethylformamide at 20 parts, 20 parts, and 60 parts, respectively) was applied by screen printing onto the back electrode layer made of aluminum foil with a thickness of 1.00 pn. , dry to form a reflective insulating layer with a thickness of 20 μm, and apply this layer to the moisture-proof film at 150°C and 50 KF1/2 so that the light-emitting layer on the reflective insulating layer is in contact with the reflective insulating layer.
Heat and pressure bonding was carried out under the conditions of ci. After that, 2 on the back electrode side.
An electroluminescent lamp having the structure shown in FIG. 2 was obtained by pressing a 200/J thick polychlorotrifluoroethylene film having a 50 μm thick adhesive layer and adhering its peripheral portion to the moisture-proof film.

In this electroluminescent lamp, there is no misalignment between the moisture-proof film and the internal structure during the manufacturing process, so adhesive sealing can be performed well at the periphery, and therefore between the transparent conductive layer and the back electrode layer. By applying a predetermined voltage to , good display could be achieved even during long-term storage. Furthermore, compared to conventional lamps, this light emitting lamp has a structure that eliminates the use of a transparent conductive film, so it has been found to be structurally simpler and advantageous in terms of the manufacturing process.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the moisture-proof film of the present invention;
FIG. 2 is a sectional view showing an example of an electroluminescent lamp to which the above moisture-proof film is applied, and FIG. 3 is a sectional view showing an example of an electroluminescent lamp to which a conventional moisture-proof film is applied. 1. Transparent moisture-proof film, 2...Transparent conductive layer, 3. Moisture-proof film Patent applicant Nitto Electric Industry Co., Ltd. (1 other person) Figure 1 1; 3 Ri! 2: MEE34eN 3: R Shio plate fill 4

Claims (2)

[Claims] (1) A moisture-proof film characterized in that a transparent conductive layer is formed on one side of the transparent moisture-proof film. (2) The moisture-proof film according to claim (1), wherein the transparent moisture-proof film is made of polychlorotrifluoroethylene.