JP2000075483A - Composition for forming fluorescent pattern and production of back-plate of plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photosensitive fluorescent paste capable of forming a fluorescent layer having a uniform thickness, in the inner surface of a barrier rib and a back plate of PDP, which has a fluorescent layer in the form capable of uniformly emitting light and the method for producing the back-plate of PDP. SOLUTION: The composition forming the fluorescent pattern is produced by kneading a binder resin, a photo-polymerizable monomer, a photoinitiator, a fluorescent substance and an organic solvent, wherein a cellulose derivative having a high molecular weight is used as the binder resin. The back-plate of PDP which has a fluorescent layer in the form capable of uniformly emitting light with high luminance and the method for producing the back-plate of PDP are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor pattern forming composition for forming a phosphor pattern in a fluorescent display device and a plasma display panel (hereinafter referred to as PDP).
) Of the back plate.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a phosphor pattern in a fluorescent display device, a phosphor paste obtained by dispersing a phosphor in a varnish comprising a binder resin and a solvent is pattern-printed by a screen printing method or the like. There is known a method of baking to thermally decompose and remove organic substances to form a phosphor layer.

Since this method has a problem in printing accuracy, it is difficult to cope with miniaturization of the pattern of the fluorescent display device. Therefore, a photolithography method using a photosensitive resin is being studied because a fine pattern can be easily formed. For example, a method of accurately forming the adhesion of a phosphor layer by using both a printing method and an exposure method (Japanese Patent Laid-Open No.
No. 32271), a method of forming using a suspension in which a phosphor is mixed with a photoresist (JP-A-52-48465).
JP-A-58-178946), a method of using a paste obtained by kneading a negative photosensitive resin and a phosphor.
JP-A-2-995) and a method of patterning by blending an ethylenically unsaturated compound with a phosphor paste.
No. 85) has been proposed.

[0004]

When a back plate of a PDP is formed, a phosphor paste is applied so that the thickness of the phosphor layer after firing at the bottom of the cell becomes 10 to 40 μm in order to secure a discharge space. Is preferably applied. When the conventional photosensitive phosphor paste described above is used, the viscosity of the paste is low or the flowability is strong, so that the paste flows down to the bottom of the cell during coating and drying, and as shown in FIG. Thick and thin walls make the emission direction and emission amount when this phosphor layer is fired to emit light as a PDP, resulting in a problem in screen display such as a narrow viewing angle.

[0005] After coating and drying, the present inventor forms a phosphor layer having a thickness similar to that of the bottom portion on the wall surface of the barrier rib as shown in FIG. 4A, and obtains a shape obtained after firing as shown in FIG. In addition, they have found that there is no deviation in the light emission direction and the light emission amount, and that the image display property is excellent. Accordingly, an object of the present invention is to provide a photosensitive phosphor paste capable of forming a phosphor layer having a uniform thickness on the inner surface of a barrier rib, a PDP back plate having a phosphor layer capable of emitting light without bias, and a PD.
It is to provide a manufacturing method of a P back plate.

[0006]

The above object is achieved by the present invention described below. That is, the present invention is a method for forming a phosphor pattern, comprising kneading a binder resin, a photopolymerizable monomer, a photopolymerization initiator, a phosphor and an organic solvent, and using a high molecular weight cellulose derivative as the binder resin. Composition, phosphor layer having a shape of phosphor layer capable of emitting light without bias and high luminance, and PD
It is a manufacturing method of a P back plate.

According to the present invention, by using a high molecular weight cellulose derivative as a binder resin, the organic matter content can be reduced without lowering the viscosity of the paste. In addition, as shown in FIG. 2C, it is possible to form a phosphor pattern having a phosphor layer with a sufficient thickness on the wall surface of the rib.

[0008]

Next, the present invention will be described in detail with reference to preferred embodiments. The binder resin used in the composition of the present invention is a cellulose derivative having a higher molecular weight than a binder resin used in a conventionally known phosphor paste, and includes, for example, polymerized methylcellulose, ethylcellulose, ethoxycellulose, and methylhydroxyl, respectively. Examples include ethylcellulose, methylhydroxypropylcellulose, methylhydroxypropylcellulose phthalate, methylhydroxypropylcellulose acetate succinate, hydroxypropylcellulose, cellulose propionate, acetylethylcellulose, acetylcellulose, butylcellulose, and benzylcellulose. The molecular weight of the binder resin is increased by crosslinking a commercially available cellulose derivative with a known crosslinking agent. Alternatively, a commercially available high molecular weight cellulose derivative may be used.

In particular, when the composition of the present invention can be developed with water, it is desirable to select and use, for example, hydroxypropylcellulose, methylhydroxypropylcellulose and a crosslinking agent thereof. The molecular weight of the cellulose derivative is preferably in the range of 50,000 to 500,000. If the molecular weight is less than 50,000, the phosphor obtained when the additive of the cellulose derivative is reduced for the purpose of improving calcination properties is obtained. If the viscosity of the paste becomes too low and the coating is applied between the barrier ribs, the paste immediately flows down to the bottom surface of the barrier ribs, causing a problem that the light emission as a PDP is inferior or the light emission direction is narrow. is there. On the other hand, when the molecular weight exceeds 500,000, the compatibility of the cellulose derivative with the organic solvent becomes poor, so that the resulting phosphor paste has poor fluidity and coatability, and has poor solubility in a developing solution. Therefore, there arises a problem that the obtained pattern has poor sharpness.

The photopolymerizable monomers used in the present invention include 2-hydroxy-3-phenoxypropyl mono (meth) acrylate, 2-hydroxyethyl (meth) acrylate, ethylene glycol mono (meth) acrylate, and cyclohexyl (meth) acrylate. Acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, dimethylaminoethyl acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di ( (Meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, alkylene oxide adduct of bisphenol A (Meth) acrylate, trimethylolpropane tri (meth) acrylate, alkylene oxide-modified trimethylolpropane tri (meth) acrylate, pentaerythritol hydroxy tri (meth) acrylate, alkylene oxide-modified pentaerythritol hydroxy tri (meth) acrylate, Pentaerythritol tetra (meth) acrylate, alkylene oxide modified pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, alkylene oxide modified ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol Pentaerythritol hexa (meth) acrylate; In the present invention, one or more of these can be used.

The photopolymerizable initiator used in the present invention includes, for example, N, N'-tetramethyl-4,4'-diaminobenzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, isopropyl Thioxanthone,
2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, benzyl, 2-ethylanthraquinone,
2,2-dimethoxy-1,2-diphenylethane-1-
On, 2-benzyl-2-dimethylamino-1- (4-
Morpholinophenyl) -butan-1-one, 2,4
6-trimethylbenzoyldiphenylphosphine oxide and the like. These photopolymerizable initiators can be used alone or in combination of two or more. A particularly preferred photopolymerizable initiator is 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1, which is represented by the following structural formula.

[0012] The phosphor used in the present invention is not particularly limited, and a conventionally known phosphor can be used. For example, as a red phosphor, Y ₂ O ₃ : Eu, Y ₂ Si
O ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : M
n, (Y, Gd) BO ₃ : EU, YO ₃ : Eu, etc., as a green phosphor, Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O ₁₉ : M
n, YBO ₃ : Tb, (Ba, Sr, Mg) O · aAl ₂
O ₂ : Mn or the like, as a blue phosphor, Y ₂ SiO ₅ : Cl;
CaWO ₄ : Pb, BaMgAl ₁₄ O ₂₃ : Eu, BaM
gAl ₁₄ O ₂₃ : Eu, BaMgAl ₁₀ O ₁₇ : Eu and the like.

The organic solvent used in the present invention includes ethers, ether esters, esters, amides, and the like.
Examples thereof include alcohols, ketones, acetates, ketone esters, glycols, glycol ethers, sulfones, sulfoxides, halogenated hydrocarbons and hydrocarbons. These can be used alone or in combination of two or more.

In the composition of the present invention, the amount of the binder resin used is about 1 compared to the conventional photosensitive phosphor paste.
The paste 1 can be reduced by about 0 to 30% by weight.
In 00 parts by weight, the content of the binder resin is 2 to 10% by weight, the polymerizable monomer is 2 to 20% by weight, preferably 5 to 20% by weight.
The content is 15% by weight, and the content of the photopolymerizable initiator is 0.1 to 10% by weight, more preferably 1 to 6% by weight. The phosphor is 15
%, Preferably 30 to 60% by weight. As described above, by using a binder having a high molecular weight, the amount of the binder resin in the paste can be reduced and the content of the phosphor can be increased even if the viscosity is the same, and the above-described effects can be obtained.

When the amount of the photopolymerizable monomer is less than 2 parts by weight, photocuring becomes insufficient and development resistance is remarkably deteriorated.
If the amount exceeds 0 parts by weight, it becomes difficult to remove the organic components of the composition remaining in the exposed region by firing, so that the luminance when the phosphor layer emits light or the light emission hue changes.

If the photopolymerizable initiator is less than 0.1 part by weight,
The photocuring of the composition becomes insufficient, and the development resistance is remarkably reduced, so that an image cannot be formed. If the photopolymerizable initiator is used in an amount exceeding 10 parts by weight, fogging and stains are liable to occur in unexposed portions during patterning, and a fine image cannot be formed.

In order to obtain a sufficient emission luminance, the phosphor is required
It is necessary to add more than weight%. However, if the phosphor is added in an amount exceeding 70% by weight, the viscosity of the paste becomes extremely high, and the coatability deteriorates.

The suitable range of the viscosity of the phosphor paste varies depending on the method of coating, but is generally in the range of 5,000 to 5
4,000 mPa · s is appropriate. 5,000 viscosity
If it is lower than mPa · s, the phosphor layer formed between the barrier ribs has a thick bottom surface and a thin wall surface.
Conversely, if the viscosity is higher than 50,000 mPa · s, the coatability will be poor. The compounding amount of the organic solvent is preferably 70 to 30% by weight based on 100 parts by weight of the composition. If it exceeds 70% by weight, the viscosity becomes too low, and the shape of the phosphor layer becomes thicker at the bottom and the wall becomes thin. If it is less than 30% by weight, the viscosity becomes too high and the coatability deteriorates.

The composition of the present invention includes a dye, a plasticizer, a polymerization inhibitor, an adhesion-imparting agent (such as a low-melting glass, a silane coupling agent, and a metal alkoxide), a thickener, a defoaming agent, and a leveling agent. Can be added as needed. Particularly, in the present invention, since a relatively small amount of a high molecular weight binder is used, sedimentation of the phosphor particles may be a problem, so that it may be preferable to use a dispersant. Such a dispersant can be various surfactants, and preferred specific examples are aliphatic ester-based, aliphatic amide-based,
Examples thereof include polycarboxylic acid type, polyamide type, polyaminoamide carboxylate and phosphate, alkylammonium salt type, and polymer polyether type. When the dispersant is used, the amount of the dispersant is 0.1 to 10% by weight based on 100 parts by weight of the composition.

The method of applying the composition of the present invention includes:
Known methods can be used. Specific examples include coating methods such as knife coating, bar coating, spin coating, curtain coating, roll coating, and die coating, and screen printing methods. Of these, the die coating method is particularly preferable because it is necessary to apply the film thickness with extremely high precision without introducing air bubbles into the substrate having irregularities due to the barrier rib walls.

A method for forming a phosphor pattern using the composition of the present invention will be described with reference to an example. First, a photosensitive phosphor paste according to the present invention is applied to a glass substrate by a die coater. The thickness of the phosphor layer after drying is 10 to 40
The coating amount is adjusted so as to be .mu.m.
Heat at 120 ° C. for 20-40 minutes and dry. Next, active radiation such as ultraviolet rays is selectively irradiated through a photomask having a desired pattern. For example, 100 to 50
Ultraviolet light of 0 mJ / cm ² is irradiated by an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and then the unexposed portions are developed and removed with a developer such as water or a dilute alkali to form an image. Thereafter, air blowing and drying are performed, followed by baking at 500 to 550 ° C. to obtain a phosphor screen pattern.

The phosphor pattern forming composition of the present invention as described above is particularly useful for producing a PDP back plate. Hereinafter, the manufacture of the PDP back plate will be described. Generally PDP
Has a structure in which a pair of electrodes arranged regularly on two opposing glass substrates are provided, and a gas mainly composed of Ne or the like is sealed between them. Then, a voltage is applied between these electrodes, and a discharge is generated in minute cells around the electrodes, so that each cell emits light and display is performed. In order to display information, regularly arranged cells are selectively caused to emit light. There are two types of PDPs, a direct current type (DC type) in which the electrodes are exposed to the discharge space, and an alternating current type (AC type) in which the electrodes are covered with an insulating layer. And a refresh driving method and a memory driving method.

FIG. 3 shows an example of the configuration of an AC type PDP. In this figure, the front plate 31 and the back plate 32 are shown separated from each other. As shown, the front plate 31 and the back plate 32 made of glass are arranged in parallel and opposed to each other. On the front side of the face plate 32, a barrier rib 33 standing upright is fixed, and the barrier rib 33 holds the front plate 31 and the back plate 32 at a constant interval. On the back side of the front plate 31, a composite electrode composed of a sustain electrode 34 which is a transparent electrode and a bus electrode 35 which is a metal electrode is formed in parallel with each other, and a dielectric layer 36 is formed so as to cover the composite electrode. , And a protective layer 37 (M
gO layer).

On the front side of the back plate 32, address electrodes 38 are formed between the barrier ribs 33 so as to be orthogonal to the composite electrodes and parallel to each other.
0 is formed so as to cover the address electrode 38. Further, a phosphor layer 39 is provided so as to cover the wall surface of the barrier rib 33 and the cell bottom surface. In this AC type PDP, by applying a predetermined voltage from an AC power source between the composite electrodes on the front plate 31 to form an electric field, the display device is divided by the front plate 31, the back plate 32, and the barrier rib 33 as a display element. Discharge is performed in each cell. Then, the phosphor layer 39 emits light by the ultraviolet rays generated by the discharge, and the light transmitted through the front plate 31 is visually recognized by the observer. In the present invention, the phosphor layer 39 is formed using the composition of the present invention.

Reference is made to FIGS. 1 and 2 which schematically illustrate the method of the present invention. FIG. 1A shows a state in which a phosphor pattern forming composition 3 is applied between a large number of barrier ribs 2 formed on a substrate 1 using a die coater or the like and dried. Next, FIG. 1B
As shown in FIG. 1, by exposing with a light 5 having an appropriate wavelength through a photomask 4, the exposed portion is cured, and this is treated with a developing solution, so that only a predetermined cell is exposed as shown in FIG. 1C. The phosphor-containing layer can be left. FIG.
Assume that the phosphor pattern forming composition C includes a phosphor that emits green light.

Next, by repeating the operations of FIGS. 1A to 1C using the composition for forming a pattern containing a blue light-emitting phosphor, a predetermined cell can be filled with the composition 6 for forming a blue phosphor pattern. (FIG. 2A). Further, the same procedure is performed using the composition 7 for forming a pattern containing the red light-emitting phosphor, so that RGB is formed at a predetermined portion of the cell as shown in FIG. 2B.
Of the three colors of the phosphor-containing pattern forming compositions. By firing the state shown in FIG. 2B at an appropriate temperature, the organic substances in the phosphor-containing pattern forming composition are burned off, and the three color RGB phosphor layers 3, 6, 7 are formed on the inner surface of the cell. Are respectively formed.

When the composition for forming a phosphor pattern used in the present invention is a water-developing type, the development after exposure is water,
In the case of a dilute alkali developing type, the development is performed using a dilute aqueous solution of about 1 to 2% by weight of an alkali such as sodium carbonate or potassium carbonate. After the development process, the substrate is
Baking is performed at 50 ° C. to fix the phosphor layer inside the cell.
Thus, the phosphor layer can be fixed on the glass substrate serving as the PDP rear substrate. The cross-sectional shape of the phosphor layer thus formed is as shown in FIG. 2C.

The present inventor has examined the thickness of the phosphor layer after firing and the luminous property of the phosphor layer in detail, and as shown schematically in FIG. The thickness of the phosphor layer is defined as a, and 4 mm from the bottom of the barrier rib.
When the thickness of the phosphor layer at the height of / 5R is b,
It was found that when b / a = 0.5 to 1, the light emission from the phosphor layer was the largest, and the light emission direction and the light emission amount were all directions, so that the best image display was possible.

[0029]

The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following, "parts" and "%" are based on weight unless otherwise specified. Example 1, green-emitting phosphor: Zn ₂ S _4: Eu (trade name: P1-G1S, Chemical Oputoniku manufactured, Inc.) 500 parts of hydroxypropyl cellulose (trade name: Nisso HPC-L, molecular weight: 150,000, Nippon Soda Co., Ltd.) 40 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1 (Trade name: Irgacure 907, manufactured by Ciba Specialty Chemicals) 20 parts ・ 2,4-diethylthioxanthone 10 parts ・ hydroquinone 0.01 part ・ Thickener: fatty acid amide wax (trade names: Disparon 6900-20X, Kusumoto Chemicals) 30 parts ・ Defoamer 5 parts ・ Cyclohexyl alcohol 400 parts or less Components were kneaded in a three-roll mill, and was created phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer.

Next, this phosphor paste composition is applied to the entire surface of a glass substrate on which an address electrode layer, a dielectric layer and a barrier rib layer have been formed by a die coater, dried at 90 ° C. for 30 minutes, and cooled to room temperature. I left it. Then, through a photomask of a desired pattern, using a UV lamp “TL180w / 10R” manufactured by Philips, 200 mJ / c.
m ² ultraviolet rays were selectively irradiated, developed with water at 20 ° C. for 1 minute, and baked at 550 ° C. for 30 minutes. The phosphor layer thus obtained did not float and was in close contact with the substrate. Also, the thickness between the barrier ribs of the phosphor layer (a)
Was 25 μm, and the thickness (b) at the height of 4 / 5R was 15 μm. When the phosphor layer thus obtained was used as a PDP and its light emission characteristics were examined, good red light emission was obtained without discoloration.

Example 2 Blue light-emitting phosphor: BaMgAl ₁₀ O ₁₇ : Mn (trade name: KX-501A, manufactured by Kasei Optonics) 500 parts Hydroxypropyl cellulose (trade name: Nisso HPC-L, molecular weight: 150,000, manufactured by Nippon Soda Co., Ltd.) 40 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropa Non-1 (trade name: Irgacure 907, manufactured by Ciba Specialty Chemicals) 20 parts ・ 2,4-diethylthioxanthone 10 parts ・ Hydroquinone 0.01 part ・ Thickener: fatty acid amide wax (trade name: Disparon 6900-20X) , Kusumoto Kasei Co., Ltd.) 30 parts ・ Defoamer 5 parts ・ Cyclohexy Alcohol 400 parts The above components were kneaded in a three-roll mill to prepare a phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer. Next, a phosphor layer was formed in the same manner as in Example 1, and the light emission characteristics were examined using this as a PDP. As a result, good blue light was emitted without discoloration.

Example 3 ・ Red emitting phosphor: (Y, Gd) BO ₃ : Eu (trade name: KX-504A, manufactured by Kasei Optonics Co., Ltd.) 500 parts ・ Hydroxypropyl cellulose (trade name: Nisso HPC-M) , Molecular weight: 140,000, manufactured by Nippon Soda Co.) 40 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-methyl-1- [4- (methylthio) phenyl] -2- Morpholinopropanone-1 (trade name: Irgacure-907, manufactured by Ciba Specialty Chemicals) 20 parts 2,10-diethylthioxanthone 10 parts Hydroquinone 0.01 part Thickener: fatty acid amide wax (trade name: Disparon) 6900-20X, manufactured by Kusumoto Kasei Co., Ltd.) 30 parts ・ Defoamer 5 parts ・ Cyclohexyl Alcohol 400 parts Next, a phosphor layer was formed in the same manner as in Example 1, and
When the light emission characteristics were examined as DP, good light emission was obtained without discoloration.

Comparative Example ・ Red emitting phosphor: (Y, Gd) BO ₃ : Eu (trade name: KX-504A, manufactured by Kasei Optonics Co., Ltd.) 500 parts ・ Hydroxypropyl cellulose (trade name: Nisso HPC-L, (Molecular weight: 15,000, manufactured by Nippon Soda Co., Ltd.) 40 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-benzyl-2-dimethylamino-1- (4-motifoli Nophenyl) -butanone (trade name: Irgacure 369, manufactured by Ciba Specialty Chemicals) 20 parts Hydroquinone 0.01 parts Antifoaming agent 5 parts 3-Methyl-3-methoxybutanol 350 parts The mixture was kneaded with this roll mill to prepare a phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer.

This phosphor composition is coated on a glass substrate on which barrier ribs have been formed by a die coater at 100 ° C.
When the phosphor layer was left at room temperature, the phosphor layer had a thick bottom surface and a thin wall surface as shown in FIG. 4B. Furthermore, exposure and development were performed and patterning was attempted in the same manner as in Example 1. However, during the development, the entire phosphor layer was eluted in water, and a phosphor pattern was not obtained.

[0035]

According to the present invention, a phosphor layer having a sufficient thickness can be formed also on the wall surface of a barrier rib by using a polymer cellulose derivative as a binder resin, and the luminescent property is good. It is possible to form a PDP back plate without uneven light emission.

[Brief description of the drawings]

FIG. 1 illustrates a method of the present invention.

FIG. 2 illustrates a method of the present invention.

FIG. 3 is an explanatory diagram of a configuration of a PDP.

FIG. 4 is a diagram for explaining a difference between a conventional method and the present invention.

FIG. 5 is a diagram illustrating a relationship between the thicknesses of phosphor layers.

[Explanation of symbols]

 1: Substrate 2: Barrier rib 3: Phosphor-containing layer (green) 4: Photomask 5: Light 6: Phosphor-containing layer (blue) 7: Phosphor-containing layer (red) 31: Front plate 32: Back plate 33: Barrier rib 34: Sustain electrode 35: Bus electrode 36: Dielectric layer 37: Protective layer 38: Address electrode 39: Phosphor layer 40: Dielectric layer of rear plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 11/02 H01J 11/02 B (72) Inventor Kazunori Nakamura 1-chome, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. (72) Masatoshi Harayama 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Dai-ni Printing Co., Ltd. (72) Inventor Hiroshi Funada, Ichigaya Kachi-cho, Shinjuku-ku, Tokyo No. 1-1, Dai Nippon Printing Co., Ltd. (72) Mitsuyoshi Kato 450, Aotomachi, Midori-ku, Yokohama, Kanagawa Prefecture The Inktec Co., Ltd. (72) Hiroshi Otsuka Aotomachi, Midori-ku, Yokohama, Kanagawa 450 address The Inktec Co., Ltd. F term (reference) 2H025 AB17 AC01 AD01 BC31 BJ06 CA00 CB04 CB55 CC03 CC11 CC20 FA39 4H001 CA01 XA05 XA08 XA12 XA13 XA14 XA15 XA20 XA30 XA 38 XA39 XA56 XA64 XA74 YA17 YA25 YA63 YA65 YA82 5C028 FF16 HH14 5C040 FA01 GB03 GF02 GG03 GG09 JA12 JA13 JA15 MA03 MA23 MA24

Claims (8)

[Claims] 1. A phosphor pattern forming method comprising kneading a binder resin, a photopolymerizable monomer, a photopolymerization initiator, a phosphor and an organic solvent, and using a high molecular weight cellulose derivative as the binder resin. Composition. 2. The composition has a viscosity of from 5,000 to 25 ° C.
The composition for forming a phosphor pattern according to claim 1, wherein the composition has a viscosity of 50,000 mPa · s. 3. The high molecular weight cellulose derivative having a molecular weight of 5
The composition for forming a phosphor pattern according to claim 1, wherein the composition has a molecular weight of 000 to 500,000. 4. The content of a high molecular weight cellulose derivative is as follows:
The phosphor pattern forming composition according to claim 1, wherein the composition occupies 2 to 10% by weight based on 100 parts by weight of the composition. 5. The composition for forming a phosphor pattern according to claim 1, wherein the content of the phosphor accounts for 15 to 70% by weight based on 100 parts by weight of the composition. 6. The method according to claim 1, further comprising a phosphor dispersant.
3. The composition for forming a phosphor pattern according to item 1. 7. A step of filling and drying the phosphor pattern forming composition according to claim 1 between a plurality of barrier ribs formed on a substrate, and a photo having a desired pattern. A method for manufacturing a back plate of a plasma display panel, comprising a step of exposing through a mask, a step of developing and removing a non-exposed area, and a step of baking the composition remaining in the exposed area. 8. A back plate of a plasma display panel in which a phosphor layer is formed between a plurality of barrier ribs formed on a substrate, wherein the height of the barrier rib is R, and the thickness of the phosphor layer between the ribs is R. A back panel of a plasma display panel, wherein b / a is 0.5 to 1, where a is the thickness of the phosphor layer at a height of 4 / 5R from the bottom of the barrier rib.