KR19980060816A - Toner composition for cathode ray tube black matrix pattern formation and method of forming black matrix pattern using same - Google Patents

Abstract

The present invention discloses a toner composition for forming a cathode ray tube black matrix pattern and a method of forming a black matrix pattern using the same. The toner composition includes a carrier liquid, a pigment, a dispersant, a charge control agent, and a binder. According to the present invention has the following effects. First, unlike conventional black matrix pattern formation according to the lithography process, there is no etching process and the dispersion of quality is reduced due to the innovative manufacturing process shortening. Second, the edge sharpness in the dot is very excellent because it does not go through the etching process, the manufacturing process is shortened to improve the productivity. Third, the dispersibility and bonding force is improved compared to the toner composition according to the prior art. Therefore, it is possible to obtain a black matrix pattern with superior edge sharpness than before, thereby forming a high quality black matrix pattern.

Description

Cathode ray tube black matrix pattern forming toner composition and method of forming black matrix pattern using the same

The present invention relates to a toner composition for forming a cathode ray tube black matrix pattern and a method of forming a black matrix pattern using the same. Specifically, the present invention not only has excellent adhesion to a cathode ray tube panel but also has excellent edge sharpness in a dot. The present invention relates to a toner composition capable of forming a high quality black matrix pattern and a method of forming a black matrix pattern using the same.

On the screen film of the color cathode ray tube, green, blue and red light emitting phosphor patterns are regularly arranged in a dot or stripe form. A black matrix is formed between the phosphor patterns in order to improve the contrast and color purity of the screen film. Such black matrices are generally formed using lithographic processes.

Lithography processes include the process of applying, exposing and developing photoresist. The photoresist may be classified into a negative type and a positive type. The photoresist may be selectively used in consideration of sensitivity, pattern shape, resolution, and adhesion to a substrate.

Currently, when forming a black matrix pattern, a negative photoresist of the photoresist is used, and the lithography process using the same is as follows.

First, a negative photoresist composition is applied to a panel inner surface of a cathode ray tube, and then dried and then exposed to light and developed to form a resin pattern on an exposed portion where a phosphor pattern is to be formed. The black matrix pattern is completed by applying graphite to the upper surface of the resin pattern and etching and removing the photoresist pattern and the graphite formed thereon using an etching solution such as sulfuric acid.

In the case of forming the black matrix pattern according to the above method, there are the following problems.

First, the viscosity of the photoresist composition, the temperature of the cathode ray tube panel before applying the photoresist composition, the rotation speed of the cathode ray tube when the photoresist composition is applied, the drying temperature after applying the photoresist composition, the illuminance of the light source during exposure, and the like. The degree of change in the properties of the black matrix film is very severe depending on the conditions. That is, the distribution of quality is very large.

Second, an etching process is included in the manufacturing process, and the process line is long and the etching is not effectively performed, so that edge sharpness in the dot is poor.

In order to solve the above problems, a method of forming a black mattress pattern using the principle of a copier has been proposed. That is, in the copier toner composition, graphite is used instead of the pigment carbon black, and the component ratio between the other components is optimized and applied to the formation of the black matrix pattern.

However, in the toner composition, it is difficult to uniformly disperse pigments and the like, and the adhesion of the black matrix film formed from such a composition to the panel is not sufficient. Therefore, there is a problem that frequently caused product defects.

The technical problem to be solved by the present invention is to solve the above problems, not only excellent adhesion to the cathode ray tube panel but also excellent edge sharpness (dot sharpness) in the dot cathode ray tube black matrix which can form a high-quality black matrix pattern A toner composition for pattern formation is provided.

Another object of the present invention is to provide a method of forming a black matrix pattern using the toner composition.

A first object of the present invention is to provide a toner composition for forming a cathode ray tube black matrix pattern comprising a carrier liquid, a pigment, a dispersant, a charge control agent and a binder.

As the binder, natural rubber, polyethylene, and the like are used, and the content of the binder is preferably 1 to 40% by weight, particularly 2 to 5% by weight. If the content of the binder is more than 40% by weight, agglomeration occurs, and if it is less than 1% by weight, the binding force of the composition is not sufficiently secured, which is not preferable.

Alkylated polyvinylpyrrolidone or the like is used as the dispersant, and the content is preferably 1 to 10% by weight, particularly 1 to 5% by weight. At this time, if the content of the dispersant is more than 5% by weight, the drying property is poor, and if the content of the dispersant is less than 1% by weight, dispersibility is bad, which is not preferable.

The second object of the present invention is to form a conductive layer on the inner surface of the panel of the cathode ray tube; (b) forming a photoconductive layer on the conductive layer; (c) charging the photoconductive layer using a corona charger, and then exposing a predetermined portion of the photoconductive layer through a shadow mask; And (d) neutralizing the charge of the exposed portion and using electrostatic attraction to the non-exposed portion, 1 to 10% by weight, 1 to 40% by weight of binder, 70 to 95% by weight of carrier fluid, 1 to 30% by weight of pigment and charge control agent. It is made by a method of forming a black matrix pattern comprising the step of attaching a toner composition comprising 1 to 20% by weight.

As the pigment, atomized graphite is used, in which the particle size of the graphite is preferably 0.2 to 0.5㎛. The content of the pigment is 1 to 30% by weight, preferably 5 to 10% by weight. At this time, if the content of the pigment is more than 10% by weight, it is not preferable because the graphite is agglomerated, if the content of the pigment is less than 5% by weight, the film packing rate during application is low.

The carrier fluid acts as a solvent in the toner composition. The carrier fluid is preferably used a material having the following characteristics.

Drying speed should be fast, colorless and odorless. The dielectric constant should be small, high resistance, nonpolar, and excellent in fluidity.

Examples of the material having the above characteristics include isoparaffinic hydrocarbon compounds, and among them, isoparg (Isopar G: Exxon), saltol 100 (Soltron 100: Philipspartium) and the like are preferred. At this time, the content of the carrier fluid is 70 to 95% by weight, preferably 85 to 90% by weight.

The charge control agent plays a role in controlling charge, and adding the charge control agent to the toner composition increases the conductivity of the composition. Therefore, when the black matrix film is formed using such a composition, a black matrix pattern having excellent contrast characteristics can be obtained. As the charge control agent, calcium petroleum sulfonate is used. The content of the charge control agent is 1 to 20% by weight, preferably 1 to 2% by weight. If the content of the charge control agent is more than 20% by weight, the electrophoretic flow of the toner particles is suppressed, and if the content of the charge control agent is less than 1% by weight, the chargeability of the toner liquid is weak and undesirable.

A method of forming a black matrix pattern using the toner composition according to the present invention will be described.

After cleaning the inner surface of the cathode ray tube panel, the conductive composition is coated to form a conductive layer. As the conductor forming the conductive layer, an inorganic conductor such as tin oxide, indium oxide, indium tin oxide, or an organic conductor such as a tetravalent ammonium salt can be used. It is more preferable to use an organic conductor in consideration of thermal decomposition during the firing step.

A photoconductive layer is formed on the conductive layer by coating a photoconductive composition including a photoconductor, a binder, a surfactant, and a solvent. At this time, the thickness of the photoconductive layer is formed so as not to be too thick in order to suppress the swelling of the aluminum (Al) film when removing the residue after firing.

The photoconductor is insulative in the dark but has electrical properties by emitting electrons or generating holes when irradiated with light such as ultraviolet rays or visible rays, including charge transfer materials and charge generating materials. . As the charge transfer material, 4- (diethylamino) benzaldehyde N-methyl-N-phenylhydrazone, 4-ethoxybenzaldehyde N, N-diphenylhydrazone, 4- (diethylamino) benzaldehyde N, N- Diphenylhydrazone, 4- (diethylamino) benzaldehyde N, N-dimethylhydrazone, 9-ethyl-3-carbazolecarboxyaldehyde N, N-diphenylhydrazone and 2-methyl-4- (diethylamino ) Phenylaldehyde N, N-diphenylhydrazone, etc. are used. In addition, as the charge generating material, 3,5-dinitrobenzonitrile, 2,6-dichloroquinone-N-chloroimide, 2,6-dibromoquinone-N-chloroimide, modern orange 1, 3,3 ', 4,4'-benzophenone tetracarboxylic dianhydride, crystal violet lactone and the like are used.

When the photoconductive composition is applied to the inner surface of the cathode ray tube panel, the surfactant included in the photoconductive composition is added to reduce the surface tension of the composition. Silicon Sila 100, Pluronic P-84, etc. are mainly used. do. In addition, chloroform, methylene chloride, acetone, toluene, cyclohexanone, cyclopentanone, and the like are used as the solvent, and polymethyl methacrylate, polycarbonate, polybutyl methacrylate, polystyrene, and the like are used as the binder.

The photoconductive layer is charged using a corona charger and a predetermined portion thereof is exposed through a shadow mask. The charge of the exposed portion is neutralized and the toner composition is attached to the non-exposed portion by using electrostatic attraction. At this time, the toner composition includes 1 to 10% by weight of dispersant, 1 to 40% by weight of binder, 70 to 95% by weight of carrier fluid, 1 to 30% by weight of pigment and 1 to 20% by weight of charge control agent.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited only to the following Examples.

Example 1

A mixture of 5 g of natural rubber and 200 g of isopar G was stirred at about 120 ° C. for 3 hours. The temperature of the reaction mixture was then brought to room temperature and then stirred for about 5 hours more.

20 g of graphite (Hitasol Co.) was added to the mixture, followed by milling for about 1 day.

Thereafter, 2 g of calcium petroleum sulfonate and 5 g of Antaron V-216 (GAF) were added and then milled for about 7 days.

Subsequently, the resultant and isopar G were mixed at a volume ratio of 1: 3 to prepare a toner composition.

Example 2

After washing the inner surface of the panel, a conductive layer was applied. 15 g of 4- (diethylamino) benzaldehyde N-methyl-N-phenylhydrazone, 10 g of 3,5-dinitrobenzonitrile, 100 g of polymethyl methacrylate, 100 g of silicone sila and 900 g of cyclohexanone on the conductive layer The composition including the coating was applied to form a photoconductive film having a thickness of about 4 μm.

After the photoconductive layer was charged using a corona charger, a predetermined portion of the photoconductive layer was exposed using a shadow mask. After neutralizing the charge of the exposed portion, the toner composition prepared in Example 1 was attached to the non-exposed portion.

Comparative Example 1

A photosensitive composition was prepared by mixing 200 g of 6% PADV aqueous solution, 1.2 g of DAS, 400 g of pure water, and a conventional surfactant.

After apply | coating the obtained photosensitive composition to the inner surface of a panel, and drying, light was irradiated from the ultrahigh pressure mercury lamp to the area | region which a dot is to be formed through a shadow mask. After removing the shadow mask, it was developed with water to form a photosensitive resin pattern.

Graphite was applied on top of the resin pattern and etched with sulfuric acid to form a black matrix pattern.

Comparative Example 2

Except for using the toner composition prepared according to the following method, it was prepared in the same manner as in Example 2.

12 g of graphite, 160 g of neocryl B and 210 g of isopar G were mixed. To 20 g of this mixture, 532 g of isopar G and 8 g of zirconium octoate were added and stirred for about 15 minutes.

632 ml of the mixture and 3000 ml of isopar G were mixed.

The state of the black matrix pattern formed according to Example 2 and Comparative Example 1-2 was examined using an electron scanning microscope (SEM). As a result, in the case of Comparative Example 1, a black matrix having small dots and a nonuniformity was formed, and in Comparative Example 2, the edge sharpness in the dots was improved than in the case of Comparative Example 1. However, the adhesion of the cathode ray panel to the panel was insufficient, and as a result, the black matrix film was partially peeled off.

On the other hand, in Example 2, the graphite was uniformly dispersed in the composition and the bonding force was very good, thereby forming a solid black matrix pattern with excellent edge sharpness in the dot. As can be seen from the above, since the lithography process is not performed, the dispersion of quality is reduced unlike in the case of Comparative Example 1.

According to the present invention has the following effects.

First, unlike conventional black matrix pattern formation according to the lithography process, there is no etching process and the dispersion of quality is reduced due to the innovative manufacturing process shortening.

Second, the edge sharpness in the dot is very excellent because it does not go through the etching process, the manufacturing process is shortened to improve the productivity.

Third, the dispersibility and bonding force is improved compared to the toner composition according to the prior art. Therefore, it is possible to obtain a black matrix pattern with superior edge sharpness than before, thereby forming a high quality black matrix pattern.

Claims (16)

A toner composition for forming a cathode ray tube black matrix pattern, comprising a carrier liquid, a pigment, a dispersant, a charge control agent, and a binder. The toner composition for forming a cathode ray tube black matrix pattern according to claim 1, wherein the dispersant is alkylated polyvinylpyrrolidone. The toner composition for forming a cathode ray tube black matrix pattern according to claim 1, wherein the binder is selected from the group consisting of natural rubber and polyethylene. The method of claim 1, wherein the composition comprises 1 to 10% by weight of dispersant, 1 to 40% by weight of binder, 70 to 95% by weight of carrier fluid, 1 to 30% by weight of pigment and 1 to 20% by weight of charge control agent. A toner composition for forming a cathode ray tube black matrix pattern. The toner composition for forming a cathode ray tube black matrix pattern according to claim 1, wherein the carrier fluid is an isoparaffinic hydrocarbon compound. The toner composition for forming a cathode ray tube black matrix pattern according to claim 1, wherein the pigment is graphite. 7. The toner composition for forming a cathode ray tube black matrix pattern according to claim 6, wherein the graphite has a particle diameter of 0.2 to 0.5 mu m. The toner composition of claim 1, wherein the charge control agent is calcium petroleum sulfonate. (a) forming a conductive layer on an inner surface of the panel of the cathode ray tube; (b) forming a photoconductive layer on the conductive layer; (c) charging the photoconductive layer using a corona charger, and then exposing a predetermined portion of the photoconductive layer through a shadow mask; And (d) 1 to 10% by weight of dispersant, 1 to 40% by weight of binder, 70 to 95% by weight of carrier fluid, 1 to 30% by weight of pigment and charge control agent 1 by neutralizing the charge of the exposed part and using electrostatic attraction to the non-exposed part A method of forming a black matrix pattern comprising the step of attaching a toner composition comprising 20 to 20% by weight. 10. The method of claim 9, wherein the dispersant is an alkylated polyvinylpyrrolidone. The method of claim 9, wherein the binder is selected from the group consisting of natural rubber and polyethylene. 10. The composition of claim 9, wherein the composition comprises 1 to 10% by weight of dispersant, 1 to 40% by weight of binder, 70 to 95% by weight of carrier fluid, 1 to 30% by weight of pigment and 1 to 20% by weight of charge control agent. Method of forming a cathode ray tube black matrix pattern. The method of claim 9, wherein the carrier fluid is an isoparaffinic hydrocarbon compound. 10. The method of claim 9, wherein the pigment is graphite. 15. The method for forming a cathode ray tube black matrix pattern according to claim 14, wherein the graphite has a particle diameter of 0.2 to 0.5 mu m. 10. The method of claim 9, wherein the charge control agent is calcium petroleum sulfonate.