JP2005281633A - Method for producing paste and method for producing plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high quality paste containing a few foreign matters which uses a dispersion machine equipped with a dispersion medium and prepares with a good dispersion efficiency. <P>SOLUTION: The method for preparing the paste comprises a kneading process for kneading a crude dispersion paste with roughly dispersed paste components to facilitate the components to disperse, wherein the crude dispersion paste is subjected to a defoaming treatment prior to the kneading process and then put in a closed dispersion machine equipped with a dispersion medium in a closed vessel to knead. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paste manufacturing method and a plasma display manufacturing method.

  In recent years, electrical and electronic products such as displays and electronic material parts have been reduced in size, definition, and precision, and the paste materials forming the members constituting these components should also respond to the above-mentioned tendency. There is a need for highly dispersible or highly pure pastes that can be used. In particular, in the plasma display field, a paste in which an inorganic material such as glass powder or conductive powder such as silver is dispersed with high accuracy in a binder is desired.

  Conventionally, as a method for dispersing inorganic powder, conductive powder, etc. in a paste, a powder, a dispersion medium, a solvent, etc. are roughly dispersed with a stirrer, and then a high-speed rotating stirrer, a three-roll disperser, a media disperser A method of dispersing the paste using the above is disclosed (for example, see Patent Documents 1 to 3).

However, when high-dispersion processing of the paste using these dispersing devices, the containers and rolls, rollers, balls, beads, and other media that make up the dispersing device are worn out and mixed as foreign matter in the paste, so that the paste has sufficient quality There was a problem that could not be manufactured. In addition, there has been a problem that when the wear of the container and the medium progresses, these are damaged.
JP 09-45514 A JP-A-11-171747 JP 2002-133947 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a high-quality paste with good dispersion efficiency and less contamination by a disperser equipped with a dispersion medium.

  The present inventors have found that the foam in the coarsely dispersed paste is the main factor for the above problems, and have come up with the present invention.

  That is, the present invention is a paste manufacturing method including a kneading step of kneading a coarsely dispersed paste in which paste components are coarsely dispersed to promote the dispersion of the paste constituent components. A method for producing a paste, characterized in that a defoaming treatment is performed prior to this, and then the mixture is put into a closed disperser having a dispersion medium in a closed container and kneaded.

  Moreover, this invention is a manufacturing method of the plasma display characterized by using the paste for plasma display member formation manufactured by the manufacturing method of the paste of this invention.

  According to the present invention, in an airtight disperser equipped with a dispersion medium, it is possible to prevent wear and breakage by reducing abnormal friction between the inner wall of the container and the dispersion medium or between the dispersion media. Accordingly, it is possible to reduce the amount of foreign matter mixed in the paste, so that a paste of good quality can be provided. Moreover, paste dispersion efficiency can be improved.

  The method for producing a paste according to the present invention includes a step of promoting the dispersion of the constituent components of the paste by kneading the coarsely dispersed paste in which the constituent components of the paste are coarsely dispersed.

  In order to obtain a coarsely dispersed paste from the components of the paste, a stirrer may be used. As an example of a stirrer, a uniaxial stirrer or a biaxial stirrer can be used. Examples of the uniaxial stirrer include a disper, a homomixer, a homogenizer, or a combination of anchor blades. Examples of the biaxial stirrer include a planetary mixer. Further, a triaxial stirrer in which a disperser or the like is combined with a planetary mixer can be used.

  In the method for producing a paste of the present invention, it is important to perform a defoaming treatment prior to putting the coarsely dispersed paste into the dispersing step.

  If the defoaming treatment is not performed prior to the introduction to the dispersion step, bubbles will remain in the coarse dispersion paste in the dispersion step, and in the foam portion, the inner wall of the container and the dispersion media, or between the dispersion media, Will directly contact, rub and collide with each other without any paste, and will stop wearing and breaking. Further, in the foam portion, the liquid / liquid shear between pastes in different flow directions is weakened, and the dispersion efficiency is lowered.

  The defoaming treatment is preferably performed in a sealed container under a pressure lower than atmospheric pressure. In addition, when the coarsely dispersed paste has a viscosity of 10,000 mPa · s or more, it is preferably performed under a pressure of 60 kPa or less in order to increase the defoaming efficiency in the coarsely dispersed paste.

  The defoaming treatment is preferably performed while flowing the paste. Defoaming from the paste proceeds when the foam in the paste reaches the surface of the paste, that is, the gas / liquid interface, breaks up while floating and flows, and the gas inside the foam is released into the gas phase. This is because, by causing the paste to flow up and down, surface flow, etc., the bubbles can efficiently reach the surface of the paste and can be efficiently broken.

  To make the paste flow, the paste container itself may be vibrated, or stirring may be performed by installing a stirring blade in the paste container.

  As an example of a defoaming machine used for defoaming treatment, it has a container for storing a coarsely dispersed paste and a hood arranged so as to seal the container, and the hood is equipped with a rotary blade. There is a reduced pressure rotary blade type defoaming machine that performs defoaming by flowing paste with a rotary blade while keeping the inside at a reduced pressure.

  In addition, when a high-viscosity paste is intended, a biaxial stirrer such as a planetary mixer may be used.

  Also, a vacuum vibration type defoaming machine having a hermetically sealed container for containing a paste and a mechanism for causing the container to move in a planetary motion, and defoaming by flowing the paste by planetary movement while keeping the inside of the container at a reduced pressure by an exhaust pump. May be used.

  An oil rotary pump, a turbine pump, or the like can be used as the exhaust pump.

The defoaming treatment is preferably performed until the defoaming degree is 99.97% or more. Here, the degree of defoaming C (%) was determined by subjecting the target coarsely dispersed paste to defoaming for 24 hours under a pressure of 0.27 kPa while stirring at a rotation speed of 30 rpm with a planetary mixer. Further, when the density of the coarsely dispersed paste after the defoaming treatment to be measured is B, it is determined by the following equation.
C = (B / A) × 100
By setting the degree of defoaming to 99.97% or more, the effect of preventing wear of the container and the dispersion medium can be remarkably obtained.

  In the paste manufacturing method of the present invention, after the coarse dispersion paste is defoamed, the dispersion state is promoted by introducing the coarse dispersion paste into a closed disperser having a dispersion medium in a closed container. In the hermetic disperser, the dispersive media in the hermetic container transmits the energy of the prime mover and the like to the paste while repeating the rotational motion and the longitudinal motion. Then, the dispersion of the paste is promoted by solid / liquid shear between the inner wall of the container or the dispersion medium and the paste. Dispersion is also promoted by causing flow of pastes having different directions and liquid / liquid shear between pastes having different flow directions.

  As such a closed type disperser, for example, a rotary container and a dispersion medium are provided in a closed container, and the dispersion medium moves as the rotary rotor is driven to knead the coarsely dispersed paste placed in the closed container. The machine can have a structure in which a paste supply port is provided at one end in the axial direction of the rotary rotor and a paste discharge port is provided at the other end.

  Further, for example, a disperser that includes a rotating disk and a dispersion medium in a sealed container and kneads the coarse dispersion paste placed in the sealed container by the movement of the dispersion medium as the rotating disk is driven is also a cylindrical container. Since the paste supply port is provided on one side and the paste discharge port is provided on the other side, continuous processing is possible, which is preferable.

  Also, for example, a disperser in which a dispersion medium is provided in a closed container and the dispersion medium moves as the closed container rotates or swings to knead the coarse dispersion paste in the container is also suitable for high-precision dispersion. preferable.

  The material of the dispersion medium is preferably glass or ceramic from the viewpoint of reducing wear. Examples of the ceramic include zirconia, alumina, zirconia reinforced alumina, and SiC.

  Further, examples of the preferable shape of the dispersion medium include a spherical shape (ball shape) and a cylindrical shape (roller shape). A spherical shape or a cylindrical shape is preferable because it can smoothly move and reduce wear and breakage of the dispersion medium when it comes into contact with a driving surface such as a rotating roller, a rotating disk, or a rotating container. Further, it is preferable because the dispersion efficiency is improved because the movement of the dispersion medium is hardly hindered.

  The paste thus kneaded is preferably filtered to remove foreign substances and can be used.

  Examples of uses of the paste obtained by the paste manufacturing method of the present invention include printing inks, paints, electronic material pastes, and the like.

  Hereinafter, a paste for plasma display (PDP) will be described as an example. The components constituting the paste for PDP use can be broadly classified into inorganic powders and organic components.

  Examples of the inorganic powder include glass powder, phosphor powder, metal powder, and pigment. It is also preferable to add a refractory filler.

  The glass powder is preferably used for partition wall formation among PDP applications.

The glass powder is preferably composed mainly of low-melting glass. The glass transition temperature of the low-melting glass is preferably 430 to 500 ° C, and the glass softening point is preferably 470 to 620 ° C. When the glass transition temperature and the glass softening point are in this range, the distortion of the substrate is small during firing, and a dense partition layer is obtained. Moreover, it is preferable that the glass has a thermal expansion coefficient of 50 × 10 ^{−7 to} 100 × 10 ⁻⁷ at 50 to 400 ° C. Moreover, it is required as a partition wall for electrical insulation, strength, coefficient of thermal expansion, denseness of insulating layer, etc. by blending silicon oxide in glass in the range of 3 to 60% by weight and boron oxide in the range of 5 to 50% by weight. Improved electrical, mechanical and thermal properties.

The particle size of the glass powder may be selected in consideration of the desired line width and height of the partition walls. The center diameter of the volume-based distribution is 1 to 6 μm, the maximum particle size is 30 μm or less, the specific surface area. Is preferably 1.5 to ⁴ cm ² / g.

  The phosphor powder is suitably used for phosphor layer formation among PDP applications.

As the phosphor powder, for example, in red, Y ₂ O ₃ : Eu, YVO ₄ : Eu, (Y, Gd) BO ₃ : Eu, Y ₂ O ₃ S: Eu, γ-Zn ₃ (PO ₄ ) ₂ : Mn, (ZnCd) S: Ag + In ₂ O _{3 and the} like. In green, Zn ₂ GeO ₂ : M, BaAl ₁₂ O ₁₉ : Mn, Zn ₂ SiO ₄ : Mn, LaPO ₄ : Tb, ZnS: (Cu, Al), ZnS: (Au, Cu, Al), (ZnCd) S: (Cu, Al), Zn ₂ SiO ₄ : (Mn, As), Y ₃ Al ₅ O ₁₂ : Ce, CeMgAl ₁₁ O ₁₉ : Tb, Gd ₂ O ₂ S: Tb, Y ₃ Al ₅ O ₁₂ : Examples thereof include Tb, ZnO: Zn, and the like. In blue, Sr ₅ (PO ₄ ) ₃ Cl: Eu, BaMgAl ₁₄ O ₂₃ : Eu, BaMgAl ₁₆ O ₂₇ : Eu, BaMg ₂ Al ₁₄ O ₂₄ : Eu, ZnS: Ag + red pigment, Y ₂ SiO ₃ : Ce, etc. Can be given.

  As the size of the phosphor powder, the area average diameter Ds is preferably 1.0 to 2.5 μm, more preferably 1.2 to 2.3 μm, and the center diameter Dv of the volume-based distribution is 1.8 to 4. 0.5 μm is preferable, 2.0 to 4.2 μm is more preferable, and Ds / Dv is preferably 1.2 to 2.5, and more preferably 1.3 to 2.3. When Ds, Dv, and Ds / Dv are within these ranges, the filterability of the paste is improved.

  The metal powder is suitably used for electrode formation among PDP applications.

  As metal powder, what contains at least 1 sort (s) chosen from the group of Ag, Au, Pd, Ni, Cu, Al, and Pt can be used. Each of these may be used alone, as an alloy, or as a mixture of powders.

  The size of the metal powder is preferably 0.7 to 6 μm, more preferably 1.3 to 4 μm, as the center diameter of the volume-based distribution. When the center diameter of the volume reference distribution is within this range, a dense fine pattern can be formed.

  The refractory filler is preferably added to stabilize the shape during firing.

  As the refractory filler, those that do not soften at a firing temperature of about 500 to 650 ° C. can be widely used, and high melting point glass and ceramic powders such as alumina, magnesia, calcia, cordierite, silica, mullite, zircon, zirconia are exemplified. it can.

  The pigment is preferably employed for adjusting the light reflection characteristics of the partition walls on the back plate of the PDP. For example, Co-Cr-Fe, Co-Mn-Fe, Co-Fe-Mn-Al, Co-Ni-Cr-Fe, Co-Ni-Mn-Cr-Fe, Co-Ni-Al When black pigments such as -Cr-Fe and Co-Mn-AL-Cr-Fe-Si are used, the diplomatic reflection can be reduced and the contrast of the displayed image can be increased. For example, when a white pigment such as titania is used, the light emission of the phosphor can be effectively guided to the front surface of the panel, and a more vivid color can be displayed.

  As content with respect to the paste of an inorganic powder, 35 to 95 weight% is preferable and 40 to 90 weight% is more preferable. By setting it within this range, shrinkage and shape change during firing can be suppressed.

  Examples of the organic component include a binder resin, an organic solvent, a plasticizer, an antioxidant, an antifoaming agent, a dispersant, and a leveling agent.

  The binder resin is preferably one that is oxidized and / or decomposed and / or vaporized at the time of firing, so that the carbide does not remain in the inorganic substance, such as ethyl cellulose, methyl cellulose, nitrocellulose, cellulose acetate, cellulose propionate, and cellulose butyrate. Cellulosic resin, or methyl (meth) acrylate, ethyl (meth) acrylate, normal butyl (meth) acrylate, isobutyl (meth) acrylate, isopropyl (meth) acrylate, 2-ethylmethyl (meth) acrylate, 2-hydroxylethyl An acrylic resin, poly-α-methylsulfone, polyvinyl alcohol, polybutene and the like made of a polymer such as (meth) acrylate or a copolymer thereof are preferably used.

  As content with respect to the paste of binder resin, 5-65 weight% is preferable and 10-60 weight% is more preferable.

  The organic solvent is used for adjusting the viscosity of the paste.

  Examples of the organic solvent include diethylene glycol monobutyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol mono-2-ethylhexyl ether, diethylene glycol mono-2-ethylhexyl ether, 2,2,4-trimethyl-1,3-pentanediol monoiso Butyrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, 2-ethyl-1,3-hexanediol, terpineol, benzyl alcohol, 1-butoxy-2-propane, 1,2-di Acetoxypropane, 1-methoxy-2-propanol, 2-acetoxy-1-ethoxypropane, (1,2-methoxypropoxy) -2-propanol, (1,2-ethoxypropoxy) -2-propanol, 2 Hydroxy-4-methyl-2-pentanone, 3-methoxy-3-methylbutyl acetate, 2-methoxyethanol, 2-ethoxyethanol, 2- (methoxymethoxy) ethanol, 2-isopropoxyethanol, 2-butoxyethanol, 2 -(Isopentyloxy) ethanol, 2- (hexyloxy) ethanol, 2-phenoxyethanol, 2- (benzyloxy) ethanol, benzyl alcohol, furfuryl alcohol, tetrafurfuryl alcohol, 2,2'-dihydroxydiethyl ether, 2 -(2-methoxyethoxy) ethanol, 2- [2- (2-methoxyethoxy) ethoxy] ethanol, 2-methyl-1-butanol, 3-methyl-2-butanol, 2-methyl-1-pentanol, 4 -Methyl-2-pen Nord, 2-ethyl-1-butanol, 2-methoxyethyl acetate, 2-ethoxyethyl acetate, 2-butoxyethyl acetate, 2-phenoxyethyl acetate, 1,2-dimethoxyethane, 1,2-diethoxyethane, 1 , 2-dibutoxyethane, cyclohexanenone, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, 1-methylpentyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, benzyl acetate, hexane, Examples include cyclohexane, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, methyl isobutyl ketone, 2-heptanone, 4-heptanone, and diisobutyl ketone.

  The organic solvent can be selected mainly considering its volatility and the solubility of the binder resin to be used. The organic solvent is preferably a good solvent for the binder resin used. If the solubility in the binder resin is high, the use of an organic solvent makes it easy to adjust the viscosity of the paste, and good coating characteristics can be obtained.

  As a content rate with respect to the paste of an organic solvent, 35-65 wt% is preferable, More preferably, it is 40-60 wt%. By setting it to 35 wt% or more, the defoaming treatment can be easily performed. Moreover, by setting it as 65 wt% or less, a stable dispersion state can be obtained and energy and time required for drying can be saved.

  When the paste is used as a photosensitive paste, as an organic component, a photosensitive component such as a photosensitive polymer, a photosensitive oligomer, and a photosensitive monomer, a photopolymerization initiator, a sensitizer, an ultraviolet absorber, a polymerization inhibitor, etc. The additive component can be mentioned.

  As the photosensitive monomer, a compound having a functional group having an active carbon-carbon unsaturated double bond can be preferably employed. As the functional group, for example, monofunctional and polyfunctional compounds having a vinyl group, an allyl group, an acrylate group, a methacrylate group, or an acrylamide group can be applied. Examples of the compound include 2- (2-ethoxyethoxy) ethyl acrylate, 1,3-butanediol diacrylate, pentaerythritol triacrylate, ditrimethylolpropane tetraacrylate, cyclohexyl methacrylate, ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate. And glycidyl methacrylate.

  The photosensitive polymer and / or the photosensitive oligomer can also be used as a binder resin for the photosensitive paste.

  The photosensitive polymer and the photosensitive oligomer are obtained by polymerization or copolymerization of the photosensitive monomer as described above.

  For example, an unsaturated acid such as an unsaturated carboxylic acid is preferable as the other copolymerization component copolymerized with the photosensitive monomer as described above, since the developability of the aqueous alkali solution after the exposure can be improved. Specific examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, and acid anhydrides thereof.

  The addition amount of the photopolymerization initiator to the photosensitive paste is preferably 0.005 to 5% by weight in view of the photosensitive properties.

  Next, the plasma display manufacturing method of the present invention is characterized by using a paste for forming a plasma display member manufactured by the paste manufacturing method of the present invention.

  As an example of the manufacturing procedure of the plasma display, a photosensitive silver paste is applied on a substrate, a stripe pattern is formed by a photolithography method, and a writing electrode is obtained.

  Next, a dielectric paste is applied to the substrate by a screen printing method and baked at 500 to 600 ° C. to form a dielectric layer.

  Further, a photosensitive glass paste is applied on the dielectric layer, and after pattern formation by a photolithography method, baking is performed at 500 to 600 ° C. for 10 to 60 minutes to form a stripe-like partition wall pattern.

  Next, a phosphor paste is applied between the aligned barrier ribs. Examples of the method for applying the phosphor paste include a screen printing method, a method for discharging the phosphor paste from the die, and a photosensitive paste method. Among these, a method for discharging the phosphor paste from the die, a screen printing method, and the like. Is preferable because a simple and low-cost PDP can be obtained. After the applied phosphor paste is dried, it is baked, for example, at 500 ° C. for 30 minutes to form phosphor layers on the side and bottom portions of the partition walls.

[Measurement and evaluation method]
(1) Defoaming degree 200 g of the target paste was weighed and defoamed for 24 hours under a pressure of 0.27 kPa while stirring at a rotation speed of 30 rpm with a small planetary mixer (manufactured by Special Machine). The density of the paste was A, the density of the paste after the defoaming treatment to be measured was B, and the degree of defoaming C (%) was calculated by the following equation.
C = (B / A) × 100.

(2) Abrasion amount of dispersion medium It was determined from the weight difference of the dispersion medium before and after the kneading treatment.

[Examples 1 to 4, Comparative Example 1]
(Coarse dispersion paste adjustment)
52% by weight of glass powder having an average particle diameter of 2 μm obtained by grinding glass mainly composed of lead oxide, boron oxide, zinc oxide, silicon oxide, and barium oxide, methyl methacrylate / methacrylic acid copolymer (weight composition ratio) 60/40, weight average molecular weight 32000) 12% by weight, dipentaerythritol hexaacrylate 12% by weight, benzophenone 1.94% by weight, 1,6-hexanediol-bis [(3,5-di-t-butyl-4 -Hydroxyphenyl) propionate] 0.05% by weight, organic dye (basic blue 7) 0.01% by weight, and organic solvent (propylene glycol monomethyl ether acetate) 22% by weight were used as constituents of the photosensitive paste.
The paste of this composition was weighed by 300 kg in each example and comparative example, and then stirred at 30 rpm for 60 minutes with a planetary mixer (manufactured by Inoue Seisakusho) to obtain a coarse dispersion paste.

(Defoaming process)
Subsequently, the internal pressure of the planetary mixer was reduced to the “pressure at the time of defoaming” shown in Table 1, and defoaming treatment was performed for the “defoaming time” in Table 1 while stirring at 30 rpm.

(Kneading process)
Next, one end of a fluororesin 18mmφ tube is connected to the planetary mixer, and the other end is a zirconia rotating rotor (diameter 100mm, length 300mm, with roller groove) and zirconia made in a sealed container. A hermetic disperser A equipped with a roller (diameter 10 mm, length 50 mm) was connected. Applying 0.2 MPa of compressed air to the planetary mixer kettle and supplying the coarsely dispersed paste in the planetary mixer kettle into the container of the hermetic disperser, and kneading at a rotational speed of the rotary rotor of 400 rpm and a residence time of 3 minutes. The paste which promoted dispersion | distribution was processed.

[Example 5]
In the kneading process, in place of the closed disperser A, a sealed container having a rotating disk made of zirconia (diameter 100 mm, thickness 10 mm, four mounted) and zirconia balls (diameter 1.2 mm) in a sealed container. A paste was obtained in the same manner as in Example 1 except that the mold disperser B was employed and the rotational speed of the disk was 400 rpm.

[Example 6]
In the kneading process, a paste was obtained in the same manner as in Example 1 except that the ball mill C was used instead of the hermetic disperser A and the ball mill was processed at a rotational speed of 20 rpm for 30 hours.

It is a cross-sectional view of what is equipped with a rotation rotor and a dispersion medium in an airtight container which is an example of the disperser used by this invention. It is an enlarged view of the roller part of FIG.

Explanation of symbols

1: Cylindrical container 2: Rotor 3: Rotating shaft 4: Groove 5: Roller 6: Slight gap 7: Gap 11: Jacket 12: Cooling medium introduction path a
13: Cooling medium introduction path b

Claims (9)

A paste manufacturing method comprising a kneading step of kneading a coarsely dispersed paste in which the constituent components of the paste are coarsely dispersed to promote the dispersion of the constituent components of the paste, wherein the coarsely dispersed paste is removed prior to being put into the kneading step. A method for producing a paste, which is subjected to foam treatment, and then put into a closed disperser having a dispersion medium in a closed container and kneaded. The method for producing a paste according to claim 1, wherein the defoaming treatment of the coarsely dispersed paste is performed under a pressure lower than atmospheric pressure. The method for producing a paste according to claim 1 or 2, wherein the defoaming treatment of the coarsely dispersed paste is performed until the defoaming degree is 99.97% or more.
Here, the degree of defoaming C (%) was determined by subjecting the target coarsely dispersed paste to defoaming for 24 hours under a pressure of 0.27 kPa while stirring at a rotation speed of 30 rpm with a planetary mixer. Further, when the density of the coarsely dispersed paste after the defoaming treatment to be measured is B, it is determined by the following equation.
C = (B / A) × 100 The closed disperser is a disperser that includes a rotating rotor and a dispersing medium in a sealed container, and kneads the coarsely dispersed paste placed in the sealed container by the movement of the dispersing medium as the rotating rotor is driven. The manufacturing method of the paste in any one of Claims 1-3. The closed disperser is a disperser that includes a rotating disk and a dispersing medium in a sealed container and kneads the coarse dispersion paste placed in the sealed container by the movement of the dispersing medium as the rotating disk is driven. The manufacturing method of the paste in any one of Claims 1-3. The closed disperser is a disperser having a dispersion medium in a closed container and kneading the coarse dispersion paste put in the container by the movement of the dispersion medium as the closed container rotates or swings. The manufacturing method of the paste in any one of claim | item 1-3. The manufacturing method of the paste in any one of Claims 1-6 in which a dispersion medium has a spherical shape or a cylindrical shape. The manufacturing method of the paste in any one of Claims 1-7 whose paste is a paste for plasma display member formation. A method for manufacturing a plasma display, comprising using a paste for forming a plasma display member manufactured by the method for manufacturing a paste according to claim 8.

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