JPH0536352A - Formation of undercoat film for crt aluminum back - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A smooth and uniform water film is formed on the phosphor screen, the solvent-based resin film layer has good smoothness, and pinholes and cracks can be eliminated. A method for forming a pretreatment agent water film is provided. [Structure] A CRT phosphor screen having a metal back layer made of aluminum metal of high brightness and high definition is applied with a pretreatment agent twice or more times, and a thin film of an undercoat film for an aluminum back is formed on the CRT phosphor screen. To create.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a pretreatment agent for applying an undercoat agent to form a metal back layer using, for example, aluminum metal on a CRT (cathode ray tube) fluorescent surface.

[0002]

2. Description of the Related Art CRTs have been used for various purposes as displays, but with the recent diversification of information and higher densities, higher performance, particularly high-definition display is required. However, the higher the resolution, the lower the brightness, which naturally limits the practicality.

[0003] Therefore, conventionally, in order to prevent the brightness from being lowered while achieving high definition, conventionally, after forming a phosphor layer, a metal back layer made of a metal such as aluminum is formed and its reflection is performed. The method of using was taken. In this method, generally, an emulsion obtained by emulsifying a resin in water is used, and this is applied onto a phosphor layer to form a film, and a metal back layer is formed on this film, or It has been performed that a water film is put on the body layer, then a resin dissolved in a solvent is put on the water film, and a metal back layer is formed on the resin film.

[0004]

Among the above-described two methods which have been conventionally performed, in the method of forming a metal back using an emulsion, a large amount of gas is volatilized during firing, and the metal back layer causes the phosphor surface to become a phosphor surface. Since the phenomenon of further lifting (so-called “fire blistering”) occurs, there was naturally a limit to smoothing the metal back layer. In addition, the method of forming a metal back using a resin dissolved in a solvent does not have the above-mentioned drawbacks because less gas is generated during firing than the emulsion method, but since the phosphor layer is water-repellent, a water film is formed. Is difficult to form, or in addition to the drawback that the smoothness of the water film cannot be maintained, it is difficult to form a uniform layer of solvent-based resin on the water film, and the film surface is uneven, There are many practical problems such as pinholes and cracks.

[0005] In particular, since the disturbance of the surface of the water film formed by the pretreatment agent has a great influence on the smoothness of the solvent-based resin layer formed thereon, how smooth and uniform the surface of the water film is It was a technical issue to improve the brightness of the CRT. The factors that hinder the smooth and uniform formation of the pretreatment agent water film are, firstly, that when the pretreatment agent spreads due to the rotation of the spinner during coating, drying occurs at the same time as shaking off. Rise and cause a change in wetting property with the phosphor layer. Secondly, especially in the stripe phosphor surface, the diffusion speed of the pretreatment agent is large in the major axis direction and the minor axis direction due to the resistance due to the unevenness of the stripe. Differently, as a result, unevenness is likely to occur. Thirdly, since the shape of the phosphor layer is inclined toward the center toward the periphery, unevenness is likely to occur. Fourth, due to rotation of the spinner. , The central part and the peripheral part have different drying properties, and unevenness is likely to occur. Furthermore, the wetting property and swelling property of the resist agent used in the phosphor layer are affected by the above four points, and the initial stage at the time of application. Not only over time It may be mentioned Motaraseru a change in the surface state.

[0006]

Means for Solving the Problems As a result of diligent studies on the above problems, the present inventors have found that a smooth and uniform water film is formed on the phosphor screen, the solvent-based resin film layer has good smoothness, and The present invention has been accomplished by finding a method for forming a pretreatment agent water film capable of eliminating the generation of holes and cracks.

That is, according to the present invention, a glass panel on which phosphor stripes or phosphor dots are laminated is coated with a pretreatment agent, and then a wet-on-wet solvent type CRT is applied on the pretreatment agent layer. In a method for forming a CRT aluminum back undercoat film, which comprises applying an aluminum back undercoat film and then drying it to form an aluminum back undercoat film, by applying the pretreatment agent twice or more. The present invention relates to a method for forming an undercoat film for aluminum back, which comprises forming a thin film.

For the application of the pretreatment agent in the present invention, a device such as a nozzle or a spray gun is used. The first application is sufficient if it is sufficient to wet the entire panel. Depending on the state of the fluorescent surface laminated on the panel, humidity, etc., the application amount is in the range of several tens to several hundreds of ml, the application time is also in the range of several seconds to several minutes, and economically selected You can Next, the second application may be performed between the time the pretreatment agent applied in the first application is shaken off and the time it is dried. Usually, after the first application is completed, for example, the application amount may be reduced to some extent. It is also possible to apply under optimal conditions for 10 seconds to several minutes.

By adopting this method, the non-uniformity of the phosphor layer is eliminated by the first application of the pretreatment agent, and the phosphor layer is made compatible with the pretreatment agent, and then the second and subsequent pretreatment agents are applied to the first time. The unevenness of the surface due to the non-uniformity of the pretreatment agent layer itself can be eliminated. The third and subsequent treatments may be applied over and over again depending on the surface condition of the control object, or may be stopped for the second time. Even if the coating amount of the first time is increased, the nonuniformity of the water film due to the above factors is not solved, and a smooth and uniform water film can be formed only by two or more times of application, and the brightness of the CRT is improved. Is possible.

As a coating condition, a commonly used spinner can be used. Further, the temperature and humidity conditions may be in the industrially possible range, but preferably, when the humidity is 60% RH or more, the evaporation of the pretreatment agent is suppressed, and it is easy to balance the drying and the diffusion. Since the film formation is completed in a short time and the smoothness of the water film is good for a long time,
High productivity and wide working range.

As the pretreatment agent used in the present invention, pure water, a water-soluble polymer aqueous solution, a water-soluble polymer alcoholic aqueous solution or the like is used. Of these, a water-soluble polymer alcoholic aqueous solution is preferable from the viewpoint of the wetting property with the phosphor layer surface and the solution viscosity at the time of application, and in consideration of the drying rate and productivity, particularly, polyvinyl alcohol-pure water-isopropanol. Systems are preferred.

[0012]

The present invention will be described in detail below with reference to examples. In addition,% and part in an Example show weight% and a weight part, respectively. Example 1 A pretreatment agent consisting of a solution of ion-exchanged water 92.5%, polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) 0.5%, isopropyl alcohol 5.0%, ethyl alcohol 2.0%. Using 2 times, 150 ml each, 30 seconds apart, 29 inches CR
A water film was formed on the T front panel. Subsequently, using toluene as a solvent, 4 parts of an undercoating agent liquid in which acrylic resin was dissolved was spray-coated on 100 parts of the solvent. After drying the solvent and water, aluminum was vapor-deposited, and a color cathode ray tube was obtained through steps such as firing. There was no uneven brightness.

Example 2 The composition of the pretreatment agent was as follows: ion-exchanged water 99.5%, polyvinyl alcohol (saponification degree 88%, polymerization degree 2400).
A color CRT was obtained in the same manner as in Example 1 except that the amount was 5%. The brightness was equivalent to that of a cathode ray tube obtained by the emulsion method. Slightly spiral brightness unevenness was observed on the phosphor screen, but it was within a practically acceptable range.

Example 3 A color Braun tube was obtained in the same manner as in Example 1 except that the composition of the pretreatment agent was 95% ion-exchanged water and 5% ethyl alcohol. The brightness was equivalent to that of a cathode ray tube obtained by the emulsion method. On the phosphor screen, a little unevenness in brightness was observed at the four corners of the effective screen, but it was within a practically acceptable range.

Example 4 The number of times the pretreatment agent was applied was 100 ml, and the number of times was 20 seconds.
A color CRT was obtained in the same manner as in Example 1 except that the number of times was changed. There was no uneven brightness. Example 5 The pretreatment agent was applied for the first time of 150 ml, and after 30 seconds, 2
A color CRT was obtained in the same manner as in Example 1 except that the time was 100 ml, and there was no uneven brightness.

Comparative Example 1 Table 1 shows the results of aluminum vapor deposition in the same manner as in Example 1 except that the pretreatment agent was applied only once at 150 m1. Comparative Example 2 Table 1 shows the results of aluminum vapor deposition in the same manner as in Example 1 except that the pretreatment agent was applied only once at 300 m 1.

Comparative Example 3 Table 1 shows the results of aluminum vapor deposition in the same manner as in Example 2 except that the number of times the pretreatment agent was applied was 150 ml and only once. Comparative Example 4 Table 1 shows the results of aluminum vapor deposition in the same manner as in Example 3 except that the number of times of application of the pretreatment agent was 150 m1 and only once.

Comparative Example 5 An emulsion (Japan Acrylic
A film was formed on the phosphor surface using Primal B-74 manufactured by Co., Ltd., then dried, and aluminum was vapor deposited. After making a color cathode ray tube, the brightness was measured. However, under the same conditions as in Example 1, blistering occurred during firing, so firing took 5 times longer than in Example 1.

[0019]

[Table 1]

As is clear from these results, the present invention is
It satisfies the technical requirements for CRTs of high brightness and high definition, and by using the forming method of the present invention,
C which has higher brightness than conventional emulsions and has better workability than any one-time application of pretreatment agent, and thus high productivity and high brightness.
RT can be obtained.

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[Procedure amendment]

[Submission date] October 13, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Method for forming undercoat film for CRT aluminum back

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention deposits a light-reflective metal thin film such as aluminum on a CRT (cathode ray tube) fluorescent screen.
The present invention relates to a method for applying a pretreatment agent for applying an undercoat agent used for forming the metal back layer.

[0002]

2. Description of the Related Art CRTs have been used for various purposes as displays, but with the recent diversification of information and higher densities, higher performance, particularly high-definition display is required. However, the higher the resolution, the smaller the ratio of the light emitting area or the focus.
Brightness of the phosphor screen (more
(Hereinafter, simply referred to as brightness) is limited, and the practical use naturally has a limit.

Therefore , in order to prevent the luminance from decreasing while achieving high definition, conventionally, after forming a phosphor layer, a metal back layer using a metal such as aluminum is formed, and further, a metal back layer is formed. Improve the smoothness of the layer
Therefore, a method of increasing the reflectance and improving the brightness has been taken. In this method, generally, an emulsion obtained by emulsifying a resin in water is used, and this is applied onto a phosphor layer to form a film, and a metal back layer is formed on this film, or It has been performed that a water film is put on the body layer, then a resin dissolved in a solvent is put on the water film, and a metal back layer is formed on the resin film.

[0004]

Among the above-described two methods which have been conventionally performed, in the method of forming a metal back using an emulsion, a large amount of gas is volatilized during firing, and the metal back layer causes the phosphor surface to become a phosphor surface. Since the phenomenon of further lifting (so-called “fire blistering”) occurs, there was naturally a limit to smoothing the metal back layer. In addition, the method of forming a metal back using a resin dissolved in a solvent does not have the above-mentioned drawbacks because less gas is generated during firing than the emulsion method, but the phosphor layer is homogeneous due to its water repellent property. Difficult to form a water film
However, there is a defect that the smoothness of the water film cannot be maintained . Furthermore, a uniform layer of solvent-based resin is formed on the water film.
It is also difficult to do , and there are many practical problems such as unevenness on the film surface and pinholes and cracks.

[0005] In particular, since the disturbance of the surface of the water film formed by the pretreatment agent has a great influence on the smoothness of the solvent-based resin layer formed thereon, how smooth and uniform the surface of the water film is It was a technical issue to improve the brightness of the CRT. The factors that hinder the smooth and uniform formation of the pretreatment agent water film are, firstly, that when the pretreatment agent spreads due to the rotation of the spinner during coating, drying occurs at the same time as shaking off. Rise and cause a change in wetting property with the phosphor layer. Secondly, especially in the stripe phosphor surface, the diffusion speed of the pretreatment agent is large in the major axis direction and the minor axis direction due to the resistance due to the unevenness of the stripe. Differently, as a result, unevenness is likely to occur. Thirdly, the center of the phosphor screen.
Since the shape and inclination of the phosphor layer are different between the peripheral part and the peripheral part
In addition, unevenness is likely to occur , and fourthly, the drying property is different between the central part and the peripheral part due to the rotation of the spinner, and unevenness is likely to occur, and the wettability to the adhesive used in the phosphor layer The swelling property and the swelling property are affected by the above four points, and the surface condition can be changed not only at the initial stage of application but also with time.

[0006]

Means for Solving the Problems As a result of diligent studies on the above problems, the present inventors have found that a smooth and uniform water film is formed on the phosphor screen, the solvent-based resin film layer has good smoothness, and The present invention has been accomplished by finding a method for forming a pretreatment agent water film capable of eliminating the generation of holes and cracks.

That is, the present invention provides a glass panel phosphor stripes or phosphor dots are formed, a water-soluble pretreatment agent is applied, then, on top of the pre-treating agent layer, Solvent type C
Applying a RT aluminum back for the under-coating agent, and Drying, C RT form an aluminum back under-coat film
In the method of forming the undercoat film for aluminum back, the pretreatment agent is applied twice or more times.
The present invention relates to a method for forming an undercoat film for a CRT aluminum back, which is characterized by applying a cloth .

For the application of the pretreatment agent in the present invention, a device such as a nozzle or a spray gun is used. The first application is sufficient if it is sufficient to wet the entire panel. Depending on the state of the phosphor screen formed on the panel and the temperature and humidity,
The application amount is in the range of several tens to several hundreds of ml, and the application time is in the range of several seconds to several minutes. Then, the second coating may be carried out until dryness from first to be coated with the pretreatment agent is spun off after 1st coating end usually between a few minutes from several tens of seconds It is applied under the optimum conditions . In practical terms,
From applying the chemical agent within a few seconds until moving to the next process
The temperature and humidity are taken into consideration by considering the waiting time and the time required for each process.
Industrially meaningful range from 10 to 60 by adjusting
It is desirable to do it in seconds. Furthermore, the coating for each coating frequency
The amount of cloth is not particularly limited, and the dry condition of the object
Mode, atmospheric temperature and humidity, ventilation volume, etc.
It is sufficient to perform an operation such as increasing the number of times and decreasing the second time.

By adopting this method, the non-uniformity of the phosphor layer is eliminated by the first application of the pretreatment agent, and the phosphor layer is made compatible with the pretreatment agent, and then the second and subsequent pretreatment agents are applied to the first time. The unevenness of the surface due to the non-uniformity of the pretreatment agent layer itself can be eliminated. The process after the 3rd time is
Depending on the surface condition of the elephant , the coating may be repeated several times or may be stopped for the second time. Even if the coating amount of the first time is increased, the nonuniformity of the water film due to the above factors is not solved, and a smooth and uniform water film can be formed only by two or more times of application, and the brightness of the CRT is improved. Is possible.

As a coating condition, a commonly used spinner can be used .

As the pretreatment agent used in the present invention, pure water, a water-soluble polymer aqueous solution, a water-soluble polymer alcoholic aqueous solution or the like is used. Of these, a water-soluble polymer alcoholic aqueous solution is preferable from the viewpoint of the wetting property with the phosphor layer surface and the solution viscosity at the time of application, and in consideration of the drying rate and productivity, particularly, polyvinyl alcohol-pure water-isopropanol. Systems are preferred.

[0012]

The present invention will be described in detail below with reference to examples. In addition,% and part in an Example show weight% and a weight part, respectively. Example 1 A pretreatment agent consisting of a solution of ion-exchanged water 92.5%, polyvinyl alcohol (saponification degree 88%, polymerization degree 2400) 0.5%, isopropyl alcohol 5.0%, ethyl alcohol 2.0%. using, by 150 ml, with an interval of 30 seconds, by applying twice, 29 inches color
-A water film was formed on the front panel of the cathode ray tube . Implemented in Figure 1
The outline of the pretreatment agent coating process on the front panel 1 is shown as an example.
You Then, toluene as a solvent, 100 parts of solvent to the undercoating agent solution prepared by dissolving 4 parts of an acrylic resin was sprayed coated fabric. 2 undercoat according to the embodiment
An outline of the agent coating process is shown. After Drying, aluminum is deposited, through processes such as baking, to obtain a color CRT. Luminance unevenness rather than luminance conventional emulsion type
It was 15% higher than.

Comparative Example 1 Table 1 shows the results of aluminum vapor deposition in the same manner as in Example 1 except that the pretreatment agent was applied only once at 150 ml. Comparative Example 2 Except that the pretreatment agent was applied only once in 300 ml,
Table 1 shows the result of vapor deposition of aluminum in the same manner as in Example 1.

Comparative Example 3 As an undercoat agent, an emulsion (Japan Acrylic
A film was formed on the surface of the phosphor by using Primal B-74 manufactured by Kagaku Co., Ltd., followed by drying and vapor deposition of aluminum. After making the finished tube, the brightness was measured. However, Example 1
Under the same conditions as above, “fire blistering” occurred during firing .
Do not cause "blister", that is, unit time during firing
In order to reduce the amount of volatile gas per unit, the firing time
It took a long time to obtain a color CRT.
Therefore, firing took 5 times as long as in Example 1.

[0015]

[Table 1]

[0016]

[Effect of the Invention] As apparent from the results, the present invention is a high intensity, as high-definition, the technical requirements for CRT,
By using the forming method of the present invention, higher brightness is realized than that of the conventionally used emulsion, and the workability is better than when any pretreatment agent is applied once. Therefore, a CRT with high productivity and high brightness can be obtained.

[Brief description of drawings]

FIG. 1 is a view showing a coating process of a pretreatment agent in Examples.
It is an outline figure showing an outline.

FIG. 2 is a view showing coating of an undercoat agent in Examples.
It is a schematic diagram showing an outline of a construction process.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

Front page continuation (72) Inventor Kiichiro Ishiguro 4-chome Sunadabashi, Higashi-ku, Nagoya, Aichi Prefecture 60-72, Product Development Laboratory, Mitsubishi Rayon Co., Ltd. (72) Inventor Shuichiro Ta 1 Sunadabashi 4-chome, Higashi-ku, Aichi Prefecture No. 60 Mitsubishi Rayon Co., Ltd. Product Development Laboratory (72) Inventor Masanori Itakura 4-chome, Sunadabashi, Higashi-ku, Nagoya, Aichi Prefecture 60-1 Mitsubishi Rayon Co., Ltd. Product Development Laboratory (72) Inventor Tomihide Endo Nagaokakyo, Kyoto Prefecture Baba Studio No. 1 Mitsubishi Electric Corporation Kyoto Works (72) Inventor Kotoji Fujiwara Nagaokakyo, Kyoto Prefecture Baba Studio No. 1 Mitsubishi Electric Corporation Kyoto Factory (72) Inventor Seihachiro Hayashi Nagaokakyo City Baba Map 1st location Mitsubishi Electric Corporation Kyoto Factory

Claims (1)

Claims: 1. A glass panel on which phosphor stripes or phosphor dots are laminated is coated with a pretreatment agent, and then, on the pretreatment agent layer, wet-on-wet,
In a method for forming an undercoat coating for a CRT aluminum back, which comprises applying a solvent-based CRT undercoat coating for an aluminum back and then drying the coating to form an aluminum back undercoat coating twice or more times. A method for forming an undercoat film for an aluminum back, which comprises forming a thin film by applying a pretreatment agent over the entire surface.