KR100718923B1 - Transparent dielectric paste composition for plasma display panel and dielectric dry film containing dielectric paste layer formed thereof - Google Patents

Abstract

Transparent dielectric of plasma display panel including dielectric powder, dispersant and other additives using acrylic polymer having both isobutyl and hydroxyl groups which can be completely fired at low temperature of the present invention as binder polymer and propylene glycol methyl ether as solvent In the paste composition, the binder polymer can be baked at a low temperature, and the dielectric paste layer having a high transmittance can be obtained by minimizing the content of residual organic matter and the generation of fine bubbles in the fired dielectric layer after firing. The film can increase the efficiency of the plasma display panel.

Plasma Display Panel * Dielectric * Dry Film * Green Sheet * Low Temperature Plasticity

Description

Transparent dielectric paste composition for plasma display panel and dielectric dry film containing dielectric paste layer formed according to the present invention.             

1 is a cross-sectional view of a surface discharge type AC PDP,

2A to 2C are diagrams illustrating a process of forming a dielectric paste layer using a screen printing method,

3A to 3C are process charts for forming a dielectric paste layer using a dry film,

4a to 4c is a manufacturing process diagram of the dielectric dry film,

5 is a flow chart of the preparation of the transparent dielectric paste composition;

6 is a graph showing thermal decomposition characteristics of the binder polymers (a) to (d) prepared in Comparative Preparation Example 1 and Preparation Examples 1 to 3,

7A to 7D are photographs of the surface state of the dielectric paste layer after baking formed using the dielectric paste compositions prepared in Comparative Examples and Examples 1 to 3 by scanning electron microscopy,

8 is a graph showing the transmittance of the dielectric paste layer after firing formed using the dielectric paste compositions prepared in Comparative Example 1 and Examples 1 to 3 of the present invention.

* Description of the symbols for the main parts of the drawings *

10-back substrate 11-address electrode

12-white dielectric 13-bulkhead

14-Front Board 15-Transparent Electrode

16-bus electrode 17-transparent dielectric

18-dielectric protective film 19-phosphor (R, G, B)

20-glass substrate 21, 21 ', 21 ", 41-dielectric paste layer

30-dry film 31-base film

32-protective film

The present invention relates to a dielectric dry film (or green sheet) comprising a transparent dielectric paste composition for a plasma display panel (PDP) and a dielectric paste layer formed therefrom. The present invention relates to a dry film comprising a dielectric paste composition for forming a top transparent dielectric paste layer of a PDP capable of fast drying properties and a dielectric paste layer formed therefrom.

The plasma display panel (PDP) is a display element for displaying an image by using a plasma generated during gas discharge, and is also called a gas discharge display element. The PDP fills discharge gas such as Ne and Xe between the upper plate and the lower plate, and the vacuum ultraviolet rays generated through the gas discharge excite the red (R), green (G), and blue (B) phosphors to generate visible light. Generate.

PDP is divided into direct current (DC) and alternating current (AC) types, and AC type is divided into counter discharge type and surface discharge type according to the electrode structure of the discharge cell. The opposite discharge type is due to the deterioration of phosphor due to ion shock. While there is a problem of shortening the lifespan, the surface discharge type overcomes the problem of the opposite discharge type structure by collecting discharge to the opposite side of the phosphor to minimize phosphor degradation, and most PDPs adopt this method.

Next, a cross-sectional view of the surface discharge type AC PDP is shown in FIG. 1. Referring to FIG. 1, the surface discharge type AC PDP includes a back substrate 10, an address electrode 11, a white dielectric 12, a partition wall 13, and the like. The front plate 14, the transparent electrode 15, the bus electrode 16, the transparent dielectric 17, the dielectric protective film 18, the black stripe (not shown), and the like are formed on the back plate. To achieve. In addition, phosphors R, G, and B 19 for realizing color in the PDP are disposed on the front plate in the case of a transmissive type and between partition walls 13 of the back plate in the case of a reflective type.

In this case, the transparent dielectric material 17 is formed to have a thickness of 40 to 60 μm, and by covering the electrode, it prevents the loss of the electrode, which is a defect of the DC PDP, and creates an important memory effect when driving the AC PDP. That is, in order to generate a discharge, the discharge dielectric must be above a certain discharge start voltage. Since the transparent dielectric 17 functions as a capacity, electrons and ions generated during discharge are accumulated on the dielectric to form wall charges. The voltage applied to generate the discharge is wall charge is formed to apply a voltage lower than the discharge start voltage to cause the discharge.

Since the transparent dielectric 17 of the front plate needs to be able to transmit light emitted by the phosphor 19 to be emitted, the high transparency is required, and the silver (Ag) electrode already formed in the transparent dielectric 17 moves during firing. It must not be migrated and must have a moderate permittivity.

On the other hand, as a process for forming a dielectric paste layer of the PDP, a screen printing method and a dry film are known.

2A to 2C show a process chart of forming a dielectric paste layer using a conventional screen printing method. In the screen printing method, as shown in FIG. 2A, the dielectric paste layer 21 is coated on the glass substrate 20 and then dried. Since the height of the dielectric paste layer formed by one printing is approximately 15 to 25 µm, this screen printing method repeatedly performs printing and drying several times until the desired thickness of the dielectric paste layer (60 to 100 µm) is obtained. Since the paste layers 21 'and 21' 'have to be laminated, processing time is long and the uneven fine shape between layers lowers the transparency of the dielectric paste layer after firing.

3A to 3C show a process of forming a dielectric paste layer using a conventional dry film.

In the process of forming a dielectric paste layer using a dry film (green sheet), first, a cover film (not shown) of the dry film 30 is peeled off and then laminated on a glass substrate, as shown in FIG. 3A. . Then, the base film 31 is removed again (FIG. 3B) to form a dielectric paste layer (FIG. 3C). The process using the dry film has the advantage that the process is simpler than the screen printing method, and since the dielectric paste layer 41 is formed to have a uniform thickness after firing, the transparency of the dielectric paste layer is improved.

Next, FIGS. 4A to 4C illustrate a process of manufacturing the dielectric dry film by forming the dielectric paste layer as described above.

In order to manufacture a dry film, first, a dielectric paste layer 41 composed of dielectric powder and an organic vehicle is coated on a base film 31 that is subjected to a release process (FIG. 4A), and dried and then again protected. 32 is laminated (FIG. 4B) to produce dielectric dry film 30 including dielectric paste layer 41. (FIG. 4C).

In this case, the dielectric paste layer requires not only printability capable of maintaining a uniform film thickness, but also a short drying time, and excellent thermal decomposition property in which an organic vehicle (mainly binder polymer) is removed by 95% by weight or less at a temperature of 400 ° C. or lower during the firing process. In particular, in order to produce a dry film, it must have adhesion with the base film.

In general, the dielectric paste layer is composed of a dielectric powder, a binder polymer, a solvent, a dispersant, and other additives, and a low boiling point solvent is required to shorten the drying time. In addition, in order to obtain the above-mentioned dielectric film having high transparency, not only the thermal decomposition property is excellent so that residual organic matter remains after firing, but in order to secure the adhesion, the use of a binder polymer having excellent adhesion between the base film for dry film and the plasma display substrate tube is required. Shall be.

On the other hand, when looking at the conventional technology for the dielectric paste layer formed on the dielectric dry film, the poly (2-ethylhexyl methacrylate) -based as a binder polymer and toluene as a solvent in the Republic of Korea Patent Application No. 2003-0021627 In the present inventors' evaluation using the same material, the drying time was required for a long time and the smoothness of the surface of the dielectric film was poor. In addition, the binder polymer was not completely calcined at a temperature of 400 ° C. or lower, and internal bubbles were formed to significantly reduce the transparency of the dielectric. In this case, there is a possibility that the luminance of the plasma display panel and the dielectric constant of the inorganic material itself may decrease, and when the surface smoothness decreases, the surface discharge characteristics of the panel may not be uniform, which may cause a problem in driving the plasma display panel.

Therefore, the present inventors are trying to solve the problems of the prior art of the PDP transparent dielectric paste layer, isobutyl group (isobutyl group) and hydroxyl group (hydroxyl group) as a binder polymer included in the transparent dielectric paste composition Using the acrylic polymer at the same time to solve the problem of the generation of residual organic matter and micro-bubbles generated from the binder polymer used in the past, it is possible to manufacture a high-permeability dielectric paste layer after firing to increase the efficiency of the plasma display panel, In addition, it is possible to shorten the drying time by using propyleneglycol methyl ether (PGME) as a solvent suitable for the binder polymer as described above, and to form a dielectric paste layer having excellent surface properties, thus providing uniform surface discharge and discharge. Can improve efficiency It is thereby completing the present invention.

Accordingly, an object of the present invention is to provide a transparent dielectric paste composition for plasma display panels having improved fast drying property, smoothness and pyrolysis characteristics.

It is still another object of the present invention to provide a dielectric dry film capable of increasing uniform efficiency of surface discharge and plasma display panel by forming a dielectric paste layer having high transmittance and excellent surface properties after firing from such a transparent dielectric paste composition. There is also.

The transparent dielectric paste composition for a plasma display panel of the present invention for achieving the above object comprises a binder polymer, a solvent, a dielectric powder, a dispersant and an additive, wherein the binder polymer is isobutyl group (isobutyl group) and hydroxyl group ( It is characterized by being an acrylic polymer having both hydroxyl groups).

       The present invention will be described in more detail as follows.

The present invention relates to a dielectric dry film comprising a dielectric paste composition for a transparent dielectric dry film and a dielectric paste layer formed therefrom.

The dielectric paste composition for a transparent dielectric dry film of the present invention is an acrylic polymer having 5 to 40% by weight of an isobutyl group and a hydroxyl group as a binder polymer, a solvent of 10 to 50% by weight, and a dielectric powder of 30 to 30%. 70 wt%, 0.5-15 wt% dispersant and 0.1-20 wt% of other additives (smoothing agent, pressure-sensitive adhesive, plasticizer).

The binder polymer included in the transparent dielectric paste composition binds the dielectric powder and serves to adjust the viscosity. In the present invention, the binder polymer has an isobutyl group and a hydroxyl group at the same time. Acrylic polymer is used.

The acrylic monomer having an isobutyl group is selected from isobutyl acrylate and isobutyl methacrylate, and the acrylic monomer having a hydroxyl group is hydroxyethyl methacrylate, hydroxypropyl. It is selected from hydroxypropyl methacrylate, hydroxyethyl acrylate, etc., In particular, hydroxyethyl methacrylate is preferable.

The acrylic polymer, which is a binder polymer of the present invention, may be prepared by solution polymerization at a temperature of 40 to 100 ° C. First, an acrylic monomer having an isobutyl group and an acrylic monomer having a hydroxyl group are dissolved in a solvent and added thereto. It can obtain by adding and stirring an initiator. At this time, by adjusting the type and the input ratio of the acrylic monomer having an isobutyl group and the acrylic monomer having a hydroxyl group, an acrylic binder polymer having various components and compositions can be synthesized.

In addition, in order to obtain an appropriate viscosity and to improve adhesiveness and smoothness, the weight average molecular weight of the binder polymer is preferably 10,000 to 600,000 g / mol. If the weight average molecular weight of the binder polymer is less than 10,000, the molecular weight is too low, leading to a drop in the physical properties of the formed film, and if it exceeds 600,000, the viscosity is too large to have poor workability during coating and adversely affect the smoothness.

The binder polymer for dielectric paste of the present invention preferably uses an acryl-based polymer having the isobutyl group and the hydroxyl group at the same time, but may also include a three-component copolymer in which a small amount of the third component is introduced. When ethylhexyl acrylate is copolymerized with the third component, the adhesiveness of the binder polymer is improved.

The binder polymer for the dielectric paste of the present invention may improve dispersibility of the dielectric powder due to the presence of hydroxyl groups in addition to the low-temperature firing properties. In general, the dielectric paste exhibits the desired properties only if it is evenly dispersed throughout the binder polymer, and various dispersants and additives are used for this purpose, but there is a limit in uniformly dispersing the dielectric powder. Also for long term storage there should be no precipitation of dielectric powder. Such dispersibility and sedimentation stability may depend on the wettability between the polymer component and the surface of the dielectric powder, and only when the wettability is excellent, the dispersibility of the dielectric powder may be excellent and sedimentation stability may be ensured.

Therefore, the binder polymer of the present invention has a hydroxyl group (-OH) in the molecule, and since the surface of the dielectric powder has most of the hydroxyl group (-OH), it is determined by the interaction of the hydroxyl period (hydrogen bond, compatibility). It has excellent acidity and sedimentation stability.

The binder polymer having the isobutyl group and the hydroxyl group of the present invention is included in 5 to 40% by weight of the total composition of the dielectric paste, when the content is less than 5% by weight, the affinity with the dielectric powder is low and the coating in the manufacture of dry film When the property is poor and more than 40% by weight, the binder component is excessively added relative to the dielectric powder, so that it is difficult to obtain a desired dielectric thickness after firing, and it is difficult to completely decompose during firing, thereby decreasing the permeability of the final dielectric film.

On the other hand, in the dielectric paste composition of the present invention, when the solvent is selected, the solubility in the binder polymer is excellent, the compatibility with the dielectric powder is good, and the dryness affects the smoothness, drying time, and surface properties of the paste. It is important. Accordingly, in the present invention, as a solvent having good compatibility with the binder polymer, propyleneglycol methylether, butyl carbitol, butyl carbitol acetate, and menthol having a boiling point of 50 to 250 ° C. Menthanol, 3-methyl-3-methoxy butanol, α-terpineol, texanol, n-methyl pyrrolidone (n- Methyl pyrrolidone) and the like, at least one selected from the solvents of acetate, alcohol, ketone, ether ether, propylene glycol methyl ether is particularly preferred in the present invention.

Propylene glycol methyl ether has a boiling point of 118 ~ 119 ℃ excellent volatility can minimize the drying time, showing the solubility of the binder polymer, compatibility with dielectric powder and excellent smoothness when forming a dry film or dielectric film. This is because, in particular, when the dry film is manufactured, the dielectric paste composition is applied to the base film and dried, and thus the amount of residual solvent is quickly dried within 1 to 8 minutes at less than 1% by weight.

The content of the solvent is contained in 10 to 50% by weight of the total composition of the dielectric paste, the viscosity is too high at less than 10% by weight, insufficient coating properties, and when the content exceeds 50% by weight is too low viscosity and drying time It takes a long time.

In addition, the dielectric powder included in the dielectric paste composition of the present invention includes PbO-B ₂ O ₃ (lead oxide-boron oxide) based, PbO-B ₂ O ₃ -SiO ₂ (lead oxide-boron oxide-silicon oxide) based Dielectric material commonly used in the art, such as PbO-B ₂ O ₃ -SiO ₂ -ZnO (lead oxide-boron oxide-silicon oxide-zinc oxide).

The dielectric powder content of the present invention is contained in 30 to 70% by weight of the total composition of the dielectric paste, when the content is less than 30% by weight voids appear when forming the dielectric film after firing, and when the content exceeds 70% by weight film formation characteristics There is this poor problem.

The dispersant of the present invention serves to uniformly disperse the dielectric powder throughout the paste, and may be a silicone or acrylic dispersant commonly used in the art, and a dispersant may be used alone or as a mixture of two or more components. At this time, anionic, cationic and nonionic dispersants are appropriately selected and used according to the components or surface properties of the dielectric powder. Examples of the silicone dispersant include amino triethoxy silane, amino trimethoxy silane, octadecyl triethoxy silane, and octyl triethoxy silane. Examples of the acrylic dispersant include a polymer or a low molecular acryl dispersant.

The content of the dispersant of the present invention is contained in 0.5 to 15% by weight of the total composition of the dielectric paste, the content is less than 0.5% by weight of the dispersibility and dispersion stability of the dielectric powder is lowered, and if the content exceeds 15% by weight The physical properties of the formed dielectric deteriorate.

In addition, other additives of the dielectric paste composition of the present invention include plasticizers, leveling agents, pressure-sensitive adhesives, and the like. The plasticizer is added to impart plasticity of the dielectric paste, and may be selected from polypropylene glycol having various molecular weights. The leveling agent is an ingredient added to improve surface smoothness after application of the dielectric paste, and may be an acrylic leveling agent, a silicone leveling agent, or the like commonly used in the art. Examples of the acrylic leveling agent include polyacrylates, polyacrylate copolymers, and polymethacrylates. Examples of the silicone leveling agents include polymethylalkyl siloxanes and polyester-modified polymethylalkylsiloxane solutions. The pressure-sensitive adhesive is for imparting adhesion with the base film during dry film production using the dielectric paste composition, and an ester pressure sensitive adhesive, an acrylic pressure sensitive adhesive, or the like commonly used in the art is used. The ester-based adhesives include rosin esters, rubbery rosin esters, and the like, such as butyl acrylate-acrylic acid and ethyl acrylate-hydroxy ethyl acrylic acid.

The content of the other additives as described above is included in 0.1 to 20% by weight of the total composition of the dielectric paste, and less than 0.1% by weight is unsuitable for the formation of the final dielectric dry film due to the lack of smoothness or poor adhesion of the film, 20% by weight If exceeded, organic residues remain after firing, adversely affecting the transmittance.

As described above, the production of the dielectric paste composition of the plasma display panel using each component follows the process flow shown in FIG. 5.

That is, first, the dispersant and the smoothing agent are dissolved in a small amount of solvent and mixed with the dielectric powder. It is preferable to stir at room temperature for 10-30 minutes so that the dispersing agent and the additive may fully act on the surface of the inorganic dielectric powder. Next, a binder polymer solution in which a binder polymer is dissolved in a solvent, a plasticizer for imparting plasticity of a final paste, and a tackifier for improving adhesiveness are added to the mixture prepared above at room temperature for 10 to 30 minutes. Stir. At this time, the viscosity of the dielectric paste is controlled using a solvent so as to maintain an appropriate viscosity. Subsequently, the prepared paste is mixed and dispersed uniformly. At this time, an attrition mill using a ceramic 3 roll mill or a zirconia bead may be used, and in particular, when the attrition mill is used, the dispersion effect is excellent. Finally, the viscosity is adjusted.

The transparent dielectric paste composition thus obtained preferably has a viscosity of 2,000 to 1,000,000 cps. If the viscosity of the transparent dielectric paste composition is too low, less than 2,000 cps, it is difficult to apply due to the strong spreadability of the glass substrate. On the contrary, when the viscosity exceeds 1,000,000 cps, the coating property is poor and there is a problem that the smoothing property is lowered after the application.

As described above, the process of manufacturing the dielectric dry film using the transparent dielectric paste composition follows the process of FIGS. 4A to 4C. First, the dielectric paste composition is applied to a base film 31 treated with an organic or silicon mold release agent to a thickness of 80 to 200 μm to form a dielectric paste layer 41, and then 5 to 30 in an IR oven at a temperature of 50 to 130 ° C. Drying for a minute gives a dried dielectric paste layer of 40-100 탆. It is preferable to maintain an appropriate amount of residual solvent in the dielectric paste layer after drying, and the protective film 32 to which the release agent is treated is subjected to a lamination process to manufacture the dry film 30. The temperature of the roll laminator is 50-130 degreeC, and is performed at a speed | rate of 0.5-2.0 m / min.

The process of applying the dielectric paste layer to the front substrate of the plasma display panel on which the electrode is applied using the dielectric dry film thus obtained follows the process diagram of FIGS. 3A to 3C. Specifically, the protective film of the transparent dielectric dry film 30 is peeled off, and this is laminated on the front substrate 20 to which the electrode is applied at 50 to 130 ° C. at a speed of 0.5 to 2.0 m / min, and the base film ( 31 is removed to form the dielectric paste layer 41. The dielectric paste layer is left to stand at 320 to 390 ° C. for 20 to 40 minutes to sinter organic materials, and then left at 500 to 600 ° C. for 10 to 40 minutes to sinter the inorganic dielectric to form a highly transparent dielectric paste layer on the electrode. do.

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

Comparative Production Example 1 Preparation of Binder Polymer

147.4 g of 2-ethylhexyl acrylate (EHA) and 26.2 g of 2-hydroxy ethyl methacrylate (HEMA) were added to the polymerization reactor, and 173.6 g of propylene glycol methyl ether as a solvent was added thereto, and the temperature was raised to 63 ° C. After raising the temperature, 0.201 g of α, α'-azobis (isobutylonitrile) was slowly added dropwise and polymerized while stirring for 5 hours to prepare a binder polymer (a) of Comparative Preparation Example 1.

Preparation Examples 1 to 3: Preparation of a Binder Polymer

2-ethylhexyl acrylate (EHA), 92.15 g, 55.29 g, 0 g, and isobutyl methacrylate (IBMA) 42.66 g, 71.1 g, 113.76 g, and 2-hydroxy ethyl methacrylate (HEMA, respectively) ) Was added to 26.2 g, 26.2 g, and 26.2 g, respectively, and the mixture was heated to 63 ° C. after adding 173.6 g of propylene glycol methyl ether as a solvent. After the temperature was raised, 0.201 g of α, α'-azobis (isobutylonitrile) was slowly added dropwise and polymerized while stirring for 5 hours to prepare binder polymers (b) to (d) of Preparation Examples 1-3.

The thermal decomposition characteristics of the binder polymer prepared by the above process was measured using a thermogravimetric analysis (TGA), and the results are shown in Table 1 and FIG. 6.

Comparative Example 1 and Examples 1 to 3

A dielectric paste composition was prepared using the binder polymers (a) to (d) prepared from Comparative Preparation Example 1 and Preparation Examples 1 to 3. First, each of 9 g of the acrylic dispersant BYK Chey's BYK-180, silicone dispersant 틸 octyl triethoxy silane and the silicone smoothing agent BYK Chemie's BYK-300 was dissolved in 24 g of solvent propylene glycol methyl ether. 180 g of inorganic dielectric powder was added to the solution, followed by stirring at room temperature for 15 minutes. To the mixed solution thus prepared, 6 g of polypropylene glycol and 12 g of an ester-based adhesive rosin ester were added as a plasticizer. In addition, a solution obtained by dissolving 48 g of the prepared binder polymers (a) to (d) in 48 g of propylene glycol methyl ether was added thereto, followed by mixing and dispersing at 300 rpm for 15 minutes with an attrition mill, respectively, to Comparative Examples 1 and 1 to 3, respectively. Dielectric paste composition was prepared.

The dielectric paste composition was applied to a base film (thickness 40 μm) treated with a release agent at a thickness of 200 μm, dried at a temperature of 110 ° C. for 5 minutes, and dried to form a dielectric layer having a thickness of 70 μm. The protective film treated therein was laminated at a rate of 0.5 m / min at a temperature of 110 ° C. to prepare a dielectric dry film.

Using the dielectric dry film thus obtained, a dielectric paste layer was coated on the front substrate for a plasma display panel by the process of Figs. 3A to 3C. This was allowed to stand for 30 minutes in a kiln at 320 ° C. to sinter organic components including the binder polymer, and then heat was applied at 550 ° C. for 30 minutes to sinter the dielectric components to form a transparent dielectric film.

The transmittance of the obtained final transparent dielectric film was measured as follows, and the results are shown in Table 1 below.

Transmittance Measurement of Transparent Dielectric Film

The transmittance | permeability measurement of the transparent dielectric film formed by the dry film used UV-2401PC by Shimatsu Corporation. At this time, the thickness of the dielectric film was 30 μm, and the same glass substrate as that on which the dielectric film was formed was measured as a base.

Table 1

As shown in the results of Table 1 and FIG. 6, as the content of isobutyl methacrylate in the binder polymer increases, the firing temperature of the binder polymer decreases and the transmittance of the transparent dielectric film formed therefrom increases. . In particular, in the case of Comparative Example 1, which does not include isobutyl group, the pyrolysis start temperature is high, so that the firing temperature is high, and the transmittance is also considerably decreased.

In addition, Figure 7a to 7d shows the result of measuring the surface of the transparent dielectric film prepared according to Comparative Example 1 and Examples 1 to 3 using a scanning electron microscope, Figure 7a is obtained from Comparative Preparation Example 1 As a photograph of the surface of the transparent dielectric film produced using the binder polymer (a), it was found that the firing temperature was increased, the transparency was low, and bubbles remained in the film. 7B, 7C, and 7D are transparent dielectric films formed using the binder polymers (b), (c), and (d) prepared from Preparation Examples 1 to 3, respectively, and the binder polymers (b to 7) prepared according to the present invention. In the case of using d), the firing temperature was relatively low, and there was no residual bubble.

8 is a measurement of the transmittance of the transparent dielectric film formed using the binder polymers (a), (b), (c) and (d) of Comparative Preparation Example 1 and Preparation Examples 1 to 3 using a UV-Visible spectrometer As a result, it can be confirmed that the excellent transmittance when using the binder polymer (b to d) prepared according to the present invention.

Example 5

In Example 5, using the binder polymer (d) prepared in Preparation Example 3, and the composition of the following Table 2, the solvent type was changed to butyl carbitol acetate, mentanol, propylene glycol methyl ether and In the same manner, a paste composition was prepared.

The prepared dielectric paste composition was applied to a base film treated with a release agent at a thickness of 200 μm, and dried at a temperature of 110 ° C. to form a dielectric paste layer of 70 μm. The drying time according to the solvent used during the drying was measured, and the results are shown in Table 2 below.

Table 2

As can be seen from the results of Table 2, the drying time of the dielectric paste composition using butyl carbitol acetate as a solvent was 20 minutes, 9 minutes for mentanol, and 5 minutes for propylene glycol methyl ether. As a result, it was confirmed that propylene glycol methyl ether was the most preferable solvent for showing the best solubility and fast drying property in the binder polymer for dielectric paste of the present invention.

As described in detail above, a high-permeability dielectric paste layer may be obtained after firing using an acrylic polymer having both isobutyl and hydroxyl groups as the binder polymer of the transparent dielectric paste composition according to the present invention. In addition, by forming a dielectric paste layer having excellent surface properties, it is possible to obtain an effect of increasing uniform surface discharge and efficiency of the plasma display panel. In addition, when propylene glycol methyl ether (PGME) is used as a solvent suitable for the binder polymer, the drying time can be shortened, thereby reducing the process time and forming a dielectric layer having excellent surface properties.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (8)

      5 ~ 40 wt% of acrylic polymer having isobutyl group and hydroxyl group as binder polymer, 10 ~ 50 wt% of solvent, 30 ~ 70 wt% of dielectric powder, 0.5 ~ 15 wt% of dispersant and others Transparent dielectric paste composition for plasma display panels containing 0.1-20 weight% of additives. delete     The transparent dielectric paste composition for plasma display panel according to claim 1, wherein the weight average molecular weight of the acrylic polymer which is the binder polymer is 10,000 to 600,000 g / mol.     The method of claim 1, wherein the solvent is propyleneglycol methylether, butyl carbitol, butyl carbitol acetate, menthanol, 3-methyl-3-methoxy Butanol (3-methyl-3-methoxy butanol), α-terpineol, α-terpineol, texanol, n-methyl pyrrolidone, etc. Transparent dielectric paste composition for a plasma display panel, characterized in that at least one selected from ether solvents.    The transparent dielectric paste composition for a plasma display panel according to claim 1, wherein the solvent is propylene glycol methyl ether.     The transparent dielectric paste composition of claim 1, wherein the other additive comprises a smoothing agent, a plasticizer, and an adhesive.     2. The transparent dielectric paste composition of claim 1, wherein the dielectric paste composition has a viscosity of 2,000 to 1,000,000 cps.     A dielectric dry film having a dielectric paste layer formed from the transparent dielectric paste composition for a plasma display panel according to claim 1.

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