KR20000018785A - Photosensitive resin composite of color cathode ray tube - Google Patents

Abstract

PURPOSE: A photosensitive resin composite of a color cathode ray tube is provided to attain efficient photosensitivity in a short time and prevent an irregular arrangement and dots of a light absorption layer. CONSTITUTION: A color cathode ray tube forms a light absorption layer using a photosensitive resin made of a high-molecular resin, a photosensitive agent, an interfacial activator, and pure water in an inside of a panel composing a display screen. The high-molecular resin is made of poly acryl amide-diacetone acryl amide. The photosensitive agent is made of 4, 4'-Diaaidostillben-2, 2'-disodium sulfonate and 2, 5 Bis(4'Azide-2'Sulfonoenzyllene) Pentanone disodium.

Description

Photosensitive resin composition of a color cathode ray tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive resin composition for forming a light absorption film of a color cathode ray tube, and in particular, to a photosensitive resin composition for sufficient photosensitive exposure even with a short photosensitive time.

As shown in FIG. 1, a general color cathode ray tube is fused by a panel 2 having a fluorescent film 1 coated on its inner surface and a frit glass 9 at a rear end of the panel 2. A funnel 3 for keeping the interior in a vacuum state, an electron gun 5 enclosed in the neck portion 4 of the funnel 3 to emit an electron beam 6, and an electron beam emitted from the electron gun 5 ( A shadow mask 7 having a color discrimination function of 6) and a frame 8 supporting the shadow mask 7 to be maintained at a constant distance from the inner surface of the panel 2 are provided.

In this case, the fluorescent film 1 is formed in a regular array of light absorbing film 10 for absorbing external reflection light to improve the contrast characteristics on the screen, the red light absorbing film 10 in the space between the light absorbing film 10 Phosphors 1 'of green, green and blue are formed in this order.

When power is applied in this configuration, the electron beam 6 is emitted from the electron gun 5, and the electron beam 6 passes through the shadow mask 7 while being deflected by a deflection yoke (not shown in the figure). Color selection is made to hit the phosphors 1b of red, green, and blue formed on the inner surface of the panel 2 to implement colors.

The fluorescent film 1 is generally composed of the light absorbing film 10 from the panel 2 in the order of a light absorbing film 10, a tricolor phosphor 1 ', and an aluminum vapor deposition film (not shown). Note the configuration method of the) will be described in detail below.

First, the light absorption film 10 is for absorbing external light to improve the contrast of the screen, and forms a photosensitive resin film 11 by coating a photosensitive resin solution on the upper surface of the panel 2 having a light transmittance of 70% or more. .

In this case, the photosensitive resin solution is generally formed by mixing a polymer resin, a photosensitizer, a sensitizer, and other surfactants. Among the polymer resins, polyvinyl alcohol and polyvinyl pyrrolidone are mainly used. ), Polyacrylamide-diacetone acrylamide (hereinafter referred to as "PAD"), etc., to serve as a support for the photosensitive resin film 11, and as a photosensitive agent light around 335 nm Bis Azide (4,4'-Diaaidostillben-2,2'-disodium sulfonate), which absorbs light and causes a curing reaction, is mainly used to cure the polymer resin to prevent it from being dissolved in moisture to form a hard film. As a sensitizer, polyhydric alcohols such as glycol (Glycol) and sorbitol (D-Sorbitol) are mainly used to improve the photosensitivity of bis azide to light, and other surface active agents. Zero uses a silane compound (Silane Coupling) for increasing the strength of the photosensitive resin film 11.

When the photosensitive resin film 11 is formed on the upper surface of the panel 2, the shadow mask 7 is inserted and exposed to light, and when developing with a solvent such as pure water, the hardened portion 11a remains. The remaining part 11b is dissolved and removed.

When the light-absorbing black paint 12 is injected into the upper surface of the panel 2, the light is not only cured from the photosensitive resin film 11 due to development, but also the light on the cured portion 11a. An absorbent black paint 12 is formed, and the light absorbing black paint 12 mainly consists of graphite and the like having fine particles.

In order to remove the cured portion 11a of the photosensitive resin film 11, a release agent 13 in which pure chemical sulfuric acid, hydrogen peroxide, sodium hypochlorite, etc. is dissolved in pure water is injected and injected into the light absorbing black paint ( Since the release agent 13 penetrates into the gaps of the particles of 12) and decomposes the hardened portion 11a, the light absorbing film 10 is easily formed.

The fluorescent film 1 may be formed by injecting, exposing and developing the phosphor 1 'dispersion by injecting green, blue, and red phosphor 1 dispersions between the light absorbing films 10 configured as described above. The description will be omitted.

However, as the size of color cathode ray tubes and the size of shadow masks have been increased, high-resolution fluorescent films are increasingly required, and since the photosensitive time is required to form such fluorescent films, conventional photosensitive resin compositions are exposed to a given process time. A problem has occurred that can not be done.

To solve this problem, it is possible to increase the illuminance of the ultra-high pressure mercury lamp of the exposure machine used for the photosensitive light. There is a problem that the quality distribution is large when the light absorption layer is formed due to deterioration, and workability is very disadvantageous due to this.

In addition, the amount of sorbitol (D-Sorbitol) used as a sensitizer is increased to increase the concentration of bisazide (4,4'-Diaaidostillben-2,2'-disodium sulfonate) used as a photosensitizer to shorten the photosensitive time. Increasing the photoresist improves the photosensitivity, thereby widening the photosensitive width even in a short exposure time, while reducing the load of mercury lamps, while forming a light absorption film, the arrangement becomes irregular, causing a problem. This is because the photosensitivity of the bis azide is limited, and because the binding ratio between the bis azide and the polymer resin is determined, it can be said that the addition of a large amount of bis azide causes the dysfunction.

The present invention has been proposed in view of such a point, and has an object of forming a photosensitive resin having sufficient photosensitivity even at a short photosensitive time and at the same time solving a problem of irregular arrangement and spot generation of a light absorption film.

Technical means of the present invention for achieving the above object in the color cathode ray tube to form a light absorption film using a photosensitive resin consisting of a polymer resin, a photosensitive agent, a surfactant, a pure water on the inner surface of the panel forming the display screen, the polymer resin And polyacrylamide-diacetone acrylamide, and the photosensitizer is bis azide (4,4'-Diaaidostillben-2,2'-disodium sulfonate) and BAP [2,5 Bis (4 '). Azide-2'Sulfonobenzylene) Pentanone disodium].

1 is a block diagram of a general color cathode ray tube.

2 is a process chart of forming a fluorescent film of a general color cathode ray tube;

(A) The state which apply | coated the photosensitive resin solution to the panel.

(B) The state which exposes the panel in which the photosensitive resin solution was apply | coated.

(C) is a state in which a non-exposed part is removed after exposing.

(D) is a state where black paint is applied to a panel from which a non-exposed part is removed.

(E) The state which apply | coated the peeling agent to the panel which black coating was apply | coated.

(Bar) is a state in which the remainder is removed leaving a light absorption film.

FIG. 3 is a diagram illustrating a comparison of absorbance coefficients for wavelengths of each composition of the photosensitive resin solution.

*** Explanation of symbols for the main parts of the drawing ***

1: fluorescent film 1 ': 3 color phosphor

2: panel 3: funnel

4 neck portion 5 electron gun

6: electron beam 7: shadow mask

8: frame 9: fritted glass

10 light absorbing film 11 photosensitive resin film

11a: hardened portion 11b: uncured portion

12 light absorbing black paint 13 release agent

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

The present invention is to solve the problem of irregular alignment and staining of the light absorbing film while having sufficient photosensitivity even in a short photosensitive time in forming a photosensitive resin for forming a light absorbing film, polymer resin, photosensitive agent, surfactant, pure water Polyacrylamide-diacetone acrylamide (PAD) is used as a polymer resin in the composition of the photosensitive resin mix | blended in a suitable ratio, and bis azide (4,4'-Diaaidostillben-2,2'-disodium) is used as a photosensitive agent. sulfonate) and BAP [2,5 Bis (4'Azide-2'Sulfonobenzylene) Pentanone disodium] are mixed and used as a surfactant.

At this time, PAD, a polymer resin, is absorbed by the photoresist and the photoreaction occurs. When the amount of the polymer resin is added too much, the viscosity of the photosensitive resin becomes high, making it difficult to form a uniform photosensitive resin film inside the panel. As the film thickness becomes thick, there is a problem that the photosensitivity becomes poor and the width of the light absorbing film decreases. Must be added.

In addition, bis azide used as a photosensitizer exhibits a high absorption coefficient only in the vicinity of 335 nm in the 300-500 nm region of the ultra-high pressure mercury lamp. The addition of BAP, which exhibits a high extinction coefficient in the vicinity, makes it possible to efficiently utilize the emission spectrum of mercury lamp, so that the photosensitivity is good and sufficient photosensitivity can be achieved even in a short time.

In this case, the most effective mixing ratio of bis azide and BAP is 1: 1, and if the mixing ratio of bis azide and BAP is not 1: 1, it exhibits light absorption characteristics of the added photosensitive agent, and thus effectively uses the emission spectrum of mercury lamp. The effect of adding BAP is halved.

In fact, as shown in FIG. 3, bis azide exhibits the highest extinction coefficient at around 335 nm and BAP exhibits a higher extinction coefficient at around 380 nm than that of bis azide. The mixture exhibits a larger absorption coefficient than the case of using bis azide or BAP alone at around 345 nm, indicating that photosensitivity to light is excellent.

On the other hand, the mixing ratio of the polymer resin and the photosensitive agent mixture is best 5: 5, and if the addition ratio of the polymer resin and the photosensitive agent mixture exceeds 5: 1, the amount of the polymer resin increases and the viscosity becomes too high, so that the thickness of the photosensitive resin film It becomes thick and the photocuring reaction progresses late, resulting in poor photosensitivity. On the contrary, if the mixing ratio is not 5: 1, the photosensitivity is improved, and thus the photosensitization is performed quickly, but there is a problem that irregularities occur due to irregular arrangement of the photosensitive resin film.

In addition, another feature of the present invention is to remove the sorbitol (D-sorbitol) used as a sensitizer in the composition of the conventional photosensitive resin, even if the sorbitol is removed, the photosensitive degradation does not occur in the composition of the present invention rather the forming surface of the light absorption film This becomes clear, and the stain characteristic is shown favorably.

Here, the silane compound serves to improve the adhesive strength so that the polymer resin as a surfactant adheres well to the inner surface of the glass panel.

Table 1 below shows conventional photosensitive resins and photosensitive resins according to the present invention [2% of PAD (polymer resin), 0.1% of each of bisazide and BAP (photosensitive agent), 0.05% of silane compound (surfactant), and remaining pure water]. The characteristics are compared.

Conventional photosensitive resin Photosensitive resin by this invention Dimming 100 100 100 100 Dimming time (sec) 20 20 16 18 Width of Light Absorption Film (㎛) 110 126 111 109

As shown in Table 1, the width of the light absorption film was increased when the light intensity and the light absorption time were the same under the same conditions. In the case where the light intensity and light absorption film were formed in the same manner, the total time was 20%. It can be seen that the degree can be shortened.

As described above, in the present invention, the photosensitive resin is improved by applying a photosensitive resin in which BAP is mixed 1: 1 with bis azide in the composition of the photosensitive resin. In the same conditions, sufficient photosensitive is achieved, so that the photosensitive time can be shortened by about 20% compared to the conventional case, thereby improving the life of the mercury lamp and forming a uniform light absorption film pattern without staining. It has an effect.

Claims (3)

In the color cathode ray tube which forms a light absorption film using a photosensitive resin consisting of a polymer resin, a photosensitive agent, a surfactant, and a pure water on the inner surface of the panel forming the display screen, The polymer resin comprises polyacrylamide-diacetone acrylamide, The photosensitizer comprises bis azide (4,4'-Diaaidostillben-2,2'-disodium sulfonate) and BAP [2,5 Bis (4'Azide-2'Sulfonobenzylene) Pentanone disodium] The photosensitive resin composition of the color cathode ray tube made into. The method of claim 1, Mixing ratio of the bis azide (4,4'-Diaaidostillben-2,2'-disodium sulfonate) and BAP [BAP: 2,5 Bis (4'Azide-2'Sulfonobenzylene) Pentanone disodium] is 1: 1 The photosensitive resin composition of the color cathode ray tube characterized by the above-mentioned. The method of claim 1, The mixing ratio of the said polymeric resin and a photosensitive agent is 5: 1, The photosensitive resin composition of the color cathode ray tube characterized by the above-mentioned.