JPH11236534A - Coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating composition which can give a transfer sheet capable of forming a dielectric layer on e.g. the undercoat layer, front panel or back panel of a plasma display panel in high precision by incorporating at least an organic binder, glass frit, a solvent, and an antisettling agent. SOLUTION: The antisettling agent which can be used is a microparticulate inorganic substance or an organic antisettling agent. The microparticulate inorganic substance is exemplified by microparticles of silica, alumina, titanium oxide or zirconia. The primary particle diameter of the microparticulate inorganic substance is about 0.01 to 0.5 μm. The content of the microparticulate inorganic substance is about 0.05 to 1.0 pt.wt. per 100 pts.wt. other solid components. The organic antisettling agent is exemplified by a fatty acid amide wax, a castor oil ester, an oxidized polyethylene, or an anionic surfactant. The content of the organic antisettling agent is about 0.1 to 5 pts.wt. per 100 pts.wt. other solid components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for forming a dielectric layer, an underlayer or an insulating layer in the production of a plasma display panel or the like.

[0002]

2. Description of the Related Art In recent years, plasma display panels (P
It is required that the formation of a dielectric layer, an underlayer, an insulating layer, and the like in DP) can be performed at low manufacturing cost while maintaining a high level of layer thickness and pattern accuracy.

Conventionally, a dielectric layer or the like in a PDP is formed by forming a predetermined pattern by a printing method such as screen printing or offset printing using a coating composition for forming a dielectric layer having desired characteristics. It is performed by a printing method or the like in which baking is performed after drying. The coating composition used in such a method for forming a dielectric layer or the like has a high viscosity (several tens of thousands cps) and is unlikely to cause sedimentation of glass frit and the like contained therein. The coating composition has relatively good stability.

[0004] However, the above-mentioned printing method is expected to simplify the process and reduce the manufacturing cost. However, the screen printing method has a limitation in printing accuracy due to the elongation of the mesh material constituting the screen printing plate. There is a problem that meshes are formed in the formed pattern or bleeding of the pattern occurs, and the edge accuracy of the pattern is low. Further, in the offset printing method, as the number of printings increases, the pattern forming paste is not completely transferred to the substrate but remains on the blanket, and the layer thickness and the accuracy of the pattern are reduced. Therefore, it is necessary to replace the blanket at any time to prevent the blanket of the paste from remaining and maintain the accuracy of forming the dielectric layer. Therefore, there is a problem that the operation is extremely complicated.

[0005]

In order to solve such a problem, a transfer sheet is formed by forming a releasable transfer layer on a base film using a coating composition for forming a dielectric layer. There is a method of forming a base layer and a dielectric layer by transferring a transfer layer to a transfer target using a transfer sheet and then baking the transfer layer. In this case, the viscosity of the coating composition for forming a dielectric layer or the like can be a stable and high viscosity of tens of thousands of cps during transportation and storage. However, a gravure coater or a reverse coater is used. At the time of coating on a base film, the viscosity of the coating composition is 500 to 20
It is necessary to set the viscosity of the coating composition to about 00 cps, and also to apply the viscosity of the coating composition to about 5000 cps even when the composition is applied on the base film with a comma coat.

However, when the viscosity is low at the time of coating as described above, sedimentation of glass frit and the like contained in the coating composition is liable to occur, and separation of the coating composition and sedimentation of components in an ink pan and the like occur, resulting in transfer. This may hinder the formation of the layer, or may degrade the characteristics of the formed dielectric layer and the like.

For this reason, a method of stabilizing the coating and forming a good transfer layer by preventing the sedimentation of the glass frit or the like by stirring or circulating the coating composition in the ink pan has been performed. However, in a coating apparatus which is not provided with a device for stirring or circulating the coating composition, there is a problem that it is difficult to form a good transfer layer by the settling of the coating composition.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and enables formation of a dielectric layer using a transfer sheet on a base layer, a front plate, a back plate, or the like of a plasma display panel with high accuracy. It is an object of the present invention to provide a coating composition capable of performing the same.

[0009]

In order to achieve the above object, the coating composition of the present invention is constituted so as to contain at least an organic binder, a glass frit, a solvent and an anti-settling agent.

Further, the coating composition of the present invention has a constitution in which the anti-settling agent is formed of inorganic fine particles having a primary particle diameter in the range of 0.01 to 0.5 μm, and the content of the inorganic fine particles is different from that of the other. The composition was such that the content was in the range of 0.05 to 1.0 part by weight based on 100 parts by weight of the solid content, and the composition was such that the inorganic fine particles were silica fine particles.

Further, in the coating composition of the present invention, the anti-settling agent is an organic anti-settling agent, and is contained in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the other solids. Configuration.

[0012]

Embodiments of the present invention will be described below.

The coating composition of the present invention contains at least an antisettling agent, an organic binder, a glass frit and a solvent. Antisettling agent As the antisettling agent constituting the coating composition of the present invention, inorganic fine particles and organic antisettling agents can be used.

Examples of the inorganic fine particles include silica fine particles, alumina fine particles, titanium oxide fine particles, zirconia fine particles, calcium carbonate fine particles, iron oxide fine particles, and magnesium oxide fine particles. The primary particle size of these inorganic fine particles is 0.01 to 0.5 μm, preferably 0.01 to 0.5 μm.
It can be set in the range of 1 μm, and the primary particle size is 0.1 μm.
If it is less than 01 μm, it is not preferable because the production of the fine particles is difficult and the dispersibility of the fine particles in the coating composition deteriorates. On the other hand, if it exceeds 0.5 μm, the effect of preventing sedimentation is lost, which is not preferable. The content of the above-mentioned inorganic fine particles is determined based on other solid contents (organic binder, glass frit, etc.) 1
It is in the range of 0.05 to 1.0 part by weight, preferably 0.05 to 0.5 part by weight with respect to 00 parts by weight, and when less than 0.05 part by weight, the effect of preventing sedimentation is insufficient. Becomes
If the amount exceeds 1.0 part by weight, the dispersion of the antisettling agent in the coating composition may be deteriorated, and cracks may occur in the dielectric layer after firing.

By subjecting the surface of the above-mentioned inorganic fine particles to a surface treatment using a silane coupling agent, a surfactant or the like, the aggregation of the inorganic fine particles can be suppressed and the dispersibility can be improved. In this case, as the silane coupling agent, chlorosilane, alkoxysilane, epoxysilane, amine silane, silazane, or the like can be used. In addition, as the surfactant, fatty acids, unsaturated fatty acids, long-chain alcohol compounds, long-chain amine compounds, long-chain sulfonic acid compounds, long-chain epoxy compounds, and the like can be used.

Examples of the organic anti-settling agent include fatty acid amide wax, castor oil ester, phosphate ester, polyethylene oxide, anionic surfactant, nonionic surfactant, modified polyacrylate and the like. Such an organic anti-settling agent is used in other solid contents (organic solid components,
0.1 to 5 parts by weight, preferably 0.1 to 3 parts by weight, per 100 parts by weight of glass frit). If the content is less than 0.1 part by weight, the effect of preventing sedimentation becomes insufficient, and if the content exceeds 5 parts by weight,
At the time of firing, the anti-settling agent is not completely fired, which adversely affects various properties such as the dielectric constant of the dielectric layer. Organic binder As the organic binder constituting the coating composition of the present invention,
A thermoplastic resin that can be removed by firing can be used.
The thermoplastic resin is contained as a binder for an inorganic component such as a glass frit, and for the purpose of improving the transferability of a transfer layer when a transfer sheet described later is formed. Specifically, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate Tert-butyl acrylate, tert-butyl methacrylate, n-pentyl acrylate, n-
Pentyl methacrylate, n-hexyl acrylate,
n-hexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, n
-Decyl acrylate, n-decyl methacrylate, 2
-Hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, and other polymers or copolymers, ethyl cellulose, etc. And the like.

In particular, methyl acrylate,
Methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-
Butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, te
rt-butyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-
Preferred is a polymer or copolymer of at least one of hydroxypropyl acrylate and 2-hydroxypropyl methacrylate, and ethyl cellulose.

The above-mentioned thermoplastic resin has a molecular weight of 10,0.
The range of 00 to 500,000 is preferred. (Other Organic Solids) The coating composition of the present invention comprises, in addition to the above organic binder, other organic solids such as a monomer, a photopolymerization initiator (sensitizer), a polymerization terminator, a chain transfer agent, and a leveling agent. An agent, a transferability-imparting agent, a stabilizer, an antifoaming agent, a thickener, a release agent and the like can be contained as required.

As the monomer, a compound having at least one polymerizable carbon-carbon unsaturated bond can be used. Specifically, allyl acrylate, benzyl acrylate, butoxyethyl acrylate, butoxyethylene glycol acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, 2-ethylhexyl acrylate, glycerol acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl Acrylate, isobonyl acrylate, isodexyl acrylate, isooctyl acrylate, lauryl acrylate, 2-
Methoxyethyl acrylate, methoxyethylene glycol acrylate, phenoxyethyl acrylate, stearyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, 1,4-
Butanediol diacrylate, 1,5-pentanediol diacrylate, 1,6-hexanediol diacrylate, 1,3-propanediol acrylate,
1,4-cyclohexanediol diacrylate, 2,
2-dimethylolpropane diacrylate, glycerol diacrylate, tripropylene glycol diacrylate, glycerol triacrylate, trimethylolpropane triacrylate, polyoxyethylated trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethylene oxide Modified pentaerythritol triacrylate, ethylene oxide modified pentaerythritol tetraacrylate, propylene oxide modified pentaerythritol triacrylate, propylene oxide modified pentaerythritol tetraacrylate, triethylene glycol diacrylate,
Polyoxypropyltrimethylolpropane triacrylate, butylene glycol diacrylate, 1,2,2
4-butanetriol triacrylate, 2,2,4-
Trimethyl-1,3-pentanediol diacrylate, diallyl fumarate, 1,10-decanediol dimethyl acrylate, pentaerythritol hexaacrylate, and the above acrylate converted to methacrylate, γ-methacryloxypropyltrimethoxysilane, 1-vinyl-2-pyrrolidone and the like. In the present invention, one or two of the above reactive monomers are used.
It can be used as a mixture of more than one species or as a mixture with other compounds.

As the photopolymerization initiator (sensitizer), benzophenone, methyl o-benzoylbenzoate, 4,4-bis (dimethylamine) benzophenone, 4,4-bis (diethylamine) benzophenone, α-amino acetophenone 4,4-dichlorobenzophenone, 4-benzoyl-4-methyldiphenylketone, dibenzylketone, fluorenone, 2,2-diethoxyacetophonone, 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2- Methyl propiophenone, p
-Tert-butyldichloroacetophenone, thioxanthone, 2-methylthioxanthone, 2-chlorothioxanthone, 2-isopropylthioxanthone, diethylthioxanthone, benzyldimethylketal, benzylmethoxyethylacetal, benzoinmethylether, benzoinbutylether, anthraquinone, 2-tert-
Butylanthraquinone, 2-amylanthraquinone, β
-Chloroanthraquinone, anthrone, benzanthrone, dibenzsuberone, methyleneanthrone, 4-azidobenzylacetophenone, 2,6-bis (p-azidobenzylidene) cyclohexane, 2,6-bis (p-azidobenzylidene) -4-methylcyclohexanone, 2
-Phenyl-1,2-butadione-2- (o-methoxycarbonyl) oxime, 1-phenyl-propanedione-2- (o-ethoxycarbonyl) oxime, 1,3-
Diphenyl-propanetrione-2- (o-ethoxycarbonyl) oxime, 1-phenyl-3-ethoxy-propanetrione-2- (o-benzoyl) oxime, Michler's ketone, 2-methyl- [4- (methylthio) phenyl]- 2-morpholino-1-propane, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, naphthalenesulfonyl chloride, quinoline sulfonyl chloride, n-phenylthioacridone, 4,4- Photoreducing dyes such as azobisisobutyronitrile, diphenyl disulfide, benzthiazole disulfide, triphenylphosphine, camphorquinone, carbon tetrabromide, tribromophenyl sulfone, benzoin peroxide, eosin, methylene blue and ascorbic acid, Combination of a reducing agent such as ethanolamine and the like, can be used These photopolymerization initiators one or more kinds.

The transferability-imparting agent is added for the purpose of improving the transferability when forming a transfer sheet as described below using the coating composition of the present invention and the fluidity of the coating composition. Normal alkyl phthalates such as dimethyl phthalate, dibutyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, butyl benzyl phthalate, diisononyl phthalate, ethyl phthalyl ethyl glycolate, butyl phthalyl butyl glycolate, etc. Phthalic acid esters, tri-2-ethylhexyl trimellitate, tri-n-alkyl trimellitate, triisononyl trimellitate, trimellitate esters such as triisodecyl trimellitate, dimethyl adipate, dibutyl adipate, The 2-ethylhexyl adipate, diisodecyl adipate, dibutyl diglycol adipate, di-2-ethylhexyl azelate Tate, dimethyl sebacate, dibutyl sebacate, di-2-ethylhexyl sebacate, di-2-ethylhexyl maleate,
Acetyl-tri- (2-ethylhexyl) citrate,
Aliphatic dibasic acid esters such as acetyl-tri-n-butyl citrate and acetyl tributyl citrate, glycol derivatives such as polyethylene glycol benzoate, triethylene glycol di- (2-ethylhexoate) and polyglycol ether Glycerol derivatives such as glycerol triacetate and glycerol diacetyl monolaurate, polyesters comprising sebacic acid, adipic acid, azelaic acid, phthalic acid, etc., molecular weight 30
0 to 3000 low molecular weight polyether, the same low molecular weight poly-α-styrene, the same low molecular weight polystyrene, trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate,
Orthophosphates such as tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, 2-ethylhexyl diphenyl phosphate, and ricinol such as methyl acetyl ricinolate Acid esters, polyester-1, epoxidized esters such as poly-1,3-butanediol adipate and epoxidized soybean oil, and acetic esters such as glycerin triacetate and 2-ethylhexyl acetate.

The content of such a transferability-imparting agent is preferably in the range of 10 to 120 parts by weight based on 100 parts by weight of the organic binder. When the content is less than 10 parts by weight, the transferability-imparting effect is not sufficiently exhibited, and
If the amount is more than 10 parts by weight, the storage stability of the coating composition is undesirably reduced.

Examples of the antifoaming agent include silicone type, acrylic type and various surfactants, and examples of the releasing agent include silicone type, fluorine oil type, paraffin type, fatty acid type and fatty acid ester. System, castor oil system,
Examples include a wax type and a compound type, and examples of the leveling agent include a fluorine type, a silicone type, various surfactants, and the like, each of which can be added in an appropriate amount.

The content of the organic solid containing the organic binder as described above is 15 to 100 parts by weight of the inorganic solid.
It can be set in the range of 40 parts by weight, preferably 20 to 35 parts by weight. Further, the content of the organic binder in the organic solid content can be set in the range of 40 to 90% by weight, preferably 50 to 70% by weight. When the content of the organic solid content is less than 15 parts by weight or the content of the organic binder in the organic solid content is less than 40% by weight, the coating composition retains a low shape retention property, and the transfer as described below is performed. When a sheet is formed, a problem arises particularly in the preservability and handling property in a roll state, and when a transfer sheet is cut (slit) into a desired shape, inorganic components are generated as dust, thereby producing a plasma display panel. Etc. may be hindered. On the other hand, if the content of the organic solid component exceeds 40 parts by weight, or if the content of the organic binder in the organic solid component exceeds 90% by weight, the organic component cannot be completely removed by calcination. It is not preferable because carbides remain in the subsequent film and adversely affect various properties such as the dielectric constant of the dielectric layer. Glass frit As the glass frit constituting the coating composition of the present invention, for example, glass having a softening temperature of 350 to 650 ° C. and a thermal expansion coefficient α ₃₀₀ of 60 × 10 ^{−7 to} 100 × 10 ⁻⁷ / ° C. A frit can be used. If the softening temperature of the glass frit exceeds 650 ° C., it is necessary to increase the baking temperature. For example, if the heat resistance of the pattern formation object is low, thermal deformation occurs in the baking stage, which is not preferable. On the other hand, if the softening temperature of the glass frit is lower than 350 ° C., the glass frit is fused before the organic components are completely decomposed, volatilized and removed by baking, which is not preferable because voids are easily formed. Further, the coefficient of thermal expansion α ₃₀₀ of the glass frit is less than 60 × 10 ⁻⁷ / ° C.
If it exceeds 0 × 10 ⁻⁷ / ° C., the difference from the coefficient of thermal expansion of the pattern-formed body may become too large, which may cause distortion and the like, which is not preferable. As such a glass frit, for example, a glass frit containing Bi ₂ O ₃ , ZnO or PbO as a main component can be used, and the average particle diameter is in a range of 0.1 to 10 μm, preferably 1 to 5 μm. be able to.

Further, in addition to the above glass frit, the coating composition of the present invention may contain, as inorganic powders, aluminum oxide, boron oxide, silica, titanium oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide, and carbonate. Glass frit 10 with inorganic powder such as calcium
It can be contained in a range of 30 parts by weight or less based on 0 parts by weight. Such an inorganic powder has an average particle size of 0.1 to
It is preferably in the range of 10 μm, which serves as an aggregate to prevent the casting of the dielectric layer pattern during firing and also to control the reflectance and the dielectric constant.

Further, in order to reduce external light reflection of the dielectric layer and improve practical contrast, a fire-resistant black pigment or white pigment can be contained as an inorganic powder. As the fire-resistant black pigment, Co-Cr-F
e, Co-Mn-Fe, Co-Fe-Mn-Al, Co
-Ni-Cr-Fe, Co-Ni-Mn-Cr-Fe,
Co-Ni-Al-Cr-Fe, Co-Mn-Al-C
r-Fe-Si etc. can be mentioned. In addition, as a fire-resistant white pigment, titanium oxide, aluminum oxide,
Silica, calcium carbonate and the like. Solvent The solvent to be contained in the coating composition of the present invention includes, for example, methanol, ethanol, n-propanol, isopropanol, ethylene glycol, alcohols such as propylene glycol, terpenes such as α- or β-terpineol, acetone, and the like. Methyl ethyl ketone,
Ketones such as cyclohexanone, N-methyl-2-pyrrolidone, diethyl ketone, 2-heptanone and 4-heptanone; aromatic hydrocarbons such as toluene, xylene and tetramethylbenzene; cellosolve, methyl cellosolve, ethyl cellosolve and carbitol , Methyl carbitol,
Ethyl carbitol, butyl carbitol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, glycol ethers such as triethylene glycol monoethyl ether, Ethyl acetate, butyl acetate, cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, carbitol acetate, ethyl carbitol acetate, butyl carbitol acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 2
Acetates such as -methoxyethyl acetate, cyclohexyl acetate, 2-ethoxyethyl acetate and 3-methoxybutyl acetate, diethylene glycol dialkyl ether, dipropylene glycol dialkyl ether, ethyl 3-ethoxypropionate, methyl benzoate, N, N- Dimethylacetamide, N, N-
Dimethylformamide and the like.

The coating composition of the present invention containing at least an anti-settling agent, an organic binder, a glass frit and a solvent as described above has good dispersibility of components having a large specific gravity, such as glass frit, and can be transported during storage. In addition to excellent stability in a state where the viscosity at the time is kept relatively high (several tens of thousands cps), sedimentation of glass frit and the like is prevented and stability is excellent even at a low viscosity of about 500 to 2000 cps. Therefore, a good coating film can be formed on the base film using a gravure coater, a reverse coater, or the like. Then, the formation of the dielectric layer or the like using the coating composition of the present invention is performed by first transferring the transfer layer onto the transfer target using a transfer sheet described below, and irradiating with ultraviolet rays as necessary to cure the transfer layer. Prevents dust from adhering. This ultraviolet irradiation may be performed before or after the peeling of the base film described later, but by irradiating the ultraviolet rays before the peeling, the peeling of the base film can be lightened. Next, a dielectric layer or the like can be formed by removing organic components by firing.

As an example of a transfer sheet formed using the coating composition of the present invention, there is a transfer sheet as shown in FIG. The transfer sheet 1 shown in FIG.
And a transfer layer 3 releasably provided on the base film 2, and a protective film 4 releasably provided on the transfer layer 3.

The transfer layer 3 is formed on the base film 2 by a known coating method such as a direct gravure coating method, a gravure reverse coating method, a reverse roll coating method, a slide die coating method, a slit die coating method, and a comma coating method. To form a coating composition. The thickness of the transfer layer 3 can be set, for example, in the range of 10 to 70 μm.

The base film 2 constituting the transfer sheet 1 is stable with respect to the coating composition of the present invention when forming the transfer layer 3, has flexibility, and has tension or pressure. Use a material that does not cause significant deformation. First, a resin film can be used as a material to be used. Specific examples of the resin film include a polyethylene film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, a polypropylene film, a polystyrene film, a polymethacrylic acid film, a polyvinyl chloride film, a polyvinyl alcohol film, and a polyvinyl butyral. Film, nylon film, polyetheretherketone film, polyphenylenesulfide film, polysulfone film, polyethersulfone film,
Polytetrafluoroethylene-perfluoroalkylvinyl ether film, polyvinyl fluoride film, tetrafluoroethylene-ethylene film, tetrafluoroethylene-hexafluoropropylene film, polychlorotrifluoroethylene film, polyvinylidene fluoride film, polyethylene terephthalate film, , 4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate film, polyester film, cellulose triacetate film, polycarbonate film, polyurethane film, polyimide film, polyetherimide film, a film in which filler is mixed with these resin materials, these Film was stretched uniaxially or biaxially. Of biaxially stretched film having an increased stretch ratio in the width than the flow direction direction using these resin materials,
Biaxially stretched films using these resin materials to increase the draw ratio in the flow direction from the width direction, those obtained by laminating films of the same or different types among these films, and the raw resin used for these films And a composite film formed by co-extrusion of the same or different resins selected from the group consisting of: Also, those obtained by treating the above resin film, for example,
Silicon-treated polyethylene terephthalate, corona-treated polyethylene terephthalate, silicon-treated polypropylene, corona-treated polypropylene, and the like can be used. Further, a metal foil or a metal steel strip can be used as the base film 2. Specific examples of such metal foil and metal steel strip include copper foil, copper steel strip, aluminum foil, aluminum steel strip, SUS430, SUS301, and SUS30.
4, stainless steel strip such as SUS420J2 and SUS631, beryllium steel strip, and the like. Further, the above-mentioned metal foil or metal steel strip bonded to the above-mentioned resin film may be used. The thickness of the base film 2 as described above can be set in a range of 4 to 400 μm, preferably 10 to 150 μm.

The protective film 4 constituting the transfer sheet 1 can be made of a material which is flexible and does not undergo significant deformation due to tension or pressure. In particular,
Polyethylene film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, polypropylene film, polystyrene film,
Polymethacrylic acid film, polyvinyl chloride film,
Polyvinyl alcohol film, polyvinyl butyral film, nylon film, polyetheretherketone film, polysulfone film, polyethersulfone film, polytetrafluoroethylene-perfluoroalkylvinylether film, polyvinyl fluoride film, tetrafluoroethylene-ethylene film, tetra Fluoroethylene-hexafluoropropylene film, polychlorotrifluoroethylene film, polyvinylidene fluoride film,
Polyethylene terephthalate film, polyethylene naphthalate film, polyester film, cellulose triacetate film, polycarbonate film, polyurethane film, polyimide film, polyetherimide film, films in which fillers are blended with these resin materials, films using these resin materials Uniaxially or biaxially stretched, a biaxially stretched film using these resin materials to increase the stretching ratio in the width direction from the flow direction, and using these resin materials to increase the stretching ratio in the flow direction from the width direction. An enhanced biaxially stretched film, a film obtained by laminating the same or different films of these films, and a co-extruded resin of the same or different types selected from the raw resin used for these films. Mention may be made of a composite film, and the like. Among these films, it is particularly preferable to use a biaxially stretched polyester film. Further, the above resin film is subjected to a treatment, for example, silicon-treated polyethylene terephthalate, corona-treated polyethylene terephthalate, melamine-treated polyethylene terephthalate, silicon-treated polypropylene, corona-treated polypropylene, silicon-treated polyethylene, corona-treated polyethylene, or the like. Can be. The thickness of the above protective film 4 is 4 to 400 μm, preferably 6 to 400 μm.
It can be set in the range of up to 150 μm.

The transfer sheet 1 may be in the form of a sheet or a long sheet. In the case of the long sheet, the transfer sheet 1 can be formed in a roll shape wound around a core. The core used is ABS resin to prevent generation of dust and paper dust,
A core formed of a vinyl chloride resin, bakelite, or the like, a resin-impregnated paper tube, or the like is preferable.

[0033]

Next, the present invention will be described in more detail with reference to examples. Preparation of Coating Composition (Samples 1 to 7) First, a paste having the following composition was prepared.

(Composition of paste) Poly-n-butyl methacrylate / 2-hydroxyethyl methacrylate copolymer (8/2 (molar ratio)) 15 parts by weight Adipate-based transferability imparting agent 10 parts by weight (Asahi Denka Co., Ltd. ADEKA Kaiser RS107) · glass frit ... 65 parts by weight (main _{ingredient: Bi 2 O 3, ZnO,} B 2 O 3 ( alkali-free) average particle size = 3 [mu] m) · titanium oxide powder ... 7 parts by weight-Aluminum oxide powder ... 5 parts by weight-Propylene glycol monomethyl ether (solvent) ... 50 parts by weight Silica fine particles (primary particle diameter 0.03 µm) as an anti-settling agent are added to the paste described above.
0.01 parts by weight, 0.05 parts by weight, 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight, and 1.
By adding 0 parts by weight and 1.5 parts by weight and passing the bead mill four times, seven kinds of coating compositions (samples 1 to 7) were prepared. Preparation of Coating Composition (Samples 8 to 10) As an anti-settling agent, the primary particle diameter was 0.016 μm, and 0.1%.
Other than using two kinds of silica fine particles of 2 μm and 1 μm,
Three coating compositions (Samples 8 to 10) were prepared in the same manner as in Sample 5 (0.5 parts by weight of the anti-settling agent). Preparation of Coating Composition (Samples 11 to 15) Fatty acid amide wax (Disparon 6900- manufactured by Kusumoto Kasei Co., Ltd.) as an anti-settling agent was added to the above paste.
X) was added in an amount of 0.05 part by weight, 0.1 part by weight, 1.0 part by weight, and 5.0 part by weight based on 100 parts by weight of the solid content of the paste.
By weight, 10 parts by weight were added, and the mixture was passed through a bead mill four times to prepare five kinds of coating compositions (samples 11 to 15). Preparation of Coating Composition (Sample 16) Coating composition was prepared in the same manner as in Sample 3 except that the surface of the silica fine particles as an anti-settling agent was treated with a silane coupling agent (KBM503 manufactured by Shin-Etsu Chemical Co., Ltd.). (Sample 16) was prepared. Preparation of Coating Composition (Sample 17) First, a paste having the following composition was prepared.

(Composition of paste) Poly-n-butyl methacrylate / 2-hydroxyethyl methacrylate copolymer (8/2 (molar ratio)) 12 parts by weight Adipate-based transferability imparting agent 5 parts by weight (Adeka Kaiser RS107 manufactured by Asahi Denka Kogyo Co., Ltd.)-Ethylene oxide-modified trimethylolpropane triacrylate ... 6 parts by weight (TMPTA-3EO manufactured by Shin-Nakamura Chemical Co., Ltd.)-Photopolymerization initiator ... 0.5 parts by weight (・ Irgacure 907 manufactured by Ciba Specialty Chemicals Co., Ltd. ・ Glass frit: 65 parts by weight (main component: Bi ₂ O ₃ , ZnO, B ₂ O ₃ (alkali-free) average particle size = 3 μm) ・ Titanium oxide powder: 7 weight Parts ・ Aluminum oxide powder… 5 parts by weight ・ Propylene glycol monomethyl ether (solvent)… 50 parts by weight Silica fine particles (primary particle diameter 0.03 μm) as an anti-settling agent were added to the above paste to obtain a solid content of 100%.
The coating composition (Sample 17) was prepared by adding 0.1 parts by weight to the parts by weight and passing the beads mill four times.

The coating composition prepared as described above (Sample 1
17) and a paste (a coating composition containing no anti-settling agent used in the preparation of Samples 1 to 8 (Sample 18)) having a viscosity of 10,000 cps (β-type viscometer, rotor 4, 25).
° C), and after storage for 1 day in an environment of 25 ° C, stability after storage for 7 days was evaluated according to the following criteria.
It was shown to.

Evaluation criteria for storage stability ：: no sedimentation was observed △: slight sedimentation occurred, but disappeared by stirring ×: hard sediment existed and did not disappear even with stirring The viscosity of the coating compositions (samples 1 to 16 and 18) stored at 10,000 cps for 1 day as described above and the coating compositions (samples 1 to 16 and 18) stored for 7 days
It was adjusted to 000 cps (β-type viscometer, rotor 4, 25 ° C.), applied to a 25 μm-thick polyethylene terephthalate film using a gravure coater, and dried to prepare a transfer sheet. The transfer sheet was pressed on a glass substrate (one on which an electrode pattern had already been formed) heated to 100 ° C. with a hot roll at 140 ° C. using an auto-cut laminator. Next, after cooling to room temperature, the base film was peeled off and the transfer layer was transferred to a glass substrate, and then the glass substrate was fired at 580 ° C. to form a dielectric layer.

As described above, 1 at 10000 cps
The viscosity of the coating composition (sample 17) stored for 7 days and the viscosity of the coating composition (sample 17) stored for 7 days was 1000 c
It was adjusted to ps (β-type viscometer, rotor 4, 25 ° C.), applied to a 25 μm-thick polyethylene terephthalate film using a gravure coater, and dried to prepare a transfer sheet. The transfer sheet was pressed on a glass substrate (one on which an electrode pattern had already been formed) heated to 100 ° C. with a hot roll at 140 ° C. using an auto-cut laminator. Next, irradiation with ultraviolet rays (irradiation amount 300 mJ / cm ² )
After that, the base film was peeled off, the transfer layer was transferred to a glass substrate, and then the glass substrate was fired at 580 ° C. to form a dielectric layer.

A series of operations for forming such a dielectric layer was observed, and applicability was evaluated based on the following criteria. The results are shown in Table 1 below.

Evaluation criteria for coating suitability ：: No sedimentation was observed in the ink, and the surface condition of the formed dielectric layer was good. ：: Slight sedimentation occurred in the ink and the formed dielectric The surface state of the body layer was somewhat poor. X: Sedimentation was present, and a good coating film could not be formed, and a transfer sheet could not be produced.

[0041]

[Table 1] As shown in Table 1, the coating compositions of Samples 2 to 6, Samples 8 to 9, Samples 12 to 14, and Samples 16 and 17 have good storage stability and coating suitability, and the formed dielectric layer It was confirmed that the thickness was uniform and the flatness of the surface was good. In addition, when the coating composition of Sample 17 was used, adhesion of dust to the transfer layer hardly occurred, and the attached dust was easily removed.

On the other hand, Sample 1, Sample 11, Sample 1
The coating composition of Sample No. 8 was poor in storage stability and coating suitability, and the coating composition of Sample 7 showed aggregation of fine particles and cracks were observed in the formed dielectric layer having an uneven coating surface. Also,
The coating composition of Sample 10 has a small effect of preventing sedimentation, the coating surface is uneven, and the coating composition of Sample 15 is
The denseness of the formed dielectric layer was insufficient.

[0043]

As described above in detail, according to the present invention, the coating composition comprises at least an organic binder, a glass frit,
Since it contains a solvent and an antisettling agent, it has good dispersibility of components having a large specific gravity, such as glass frit, and has excellent stability in a state where the viscosity during storage and transportation is kept relatively high. Of course, 500-2000c
Even at a low viscosity of about ps, sedimentation of glass frit and the like is prevented and the stability is excellent, a gravure coater, a good coating film can be formed on a base film using a reverse coater, etc., such a coating composition of the present invention It is possible to form a dielectric layer having a uniform layer thickness with high accuracy by using a transfer sheet for forming a dielectric layer formed by using the method.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a transfer sheet formed using a coating composition of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transfer sheet 2 ... Base film 3 ... Transfer layer 4 ... Protective film

Claims (5)

[Claims] 1. A coating composition comprising at least an organic binder, a glass frit, a solvent and an antisettling agent. 2. The anti-settling agent has a primary particle size of 0.01.
The coating composition according to claim 1, wherein the coating composition is an inorganic fine particle having a particle size in a range of from 0.5 to 0.5 m. 3. The coating composition according to claim 2, wherein the content of the inorganic fine particles is in a range of 0.05 to 1.0 part by weight based on 100 parts by weight of the other solid components. . 4. The coating composition according to claim 1, wherein the inorganic fine particles are silica fine particles. 5. The anti-settling agent according to claim 1, wherein the anti-settling agent is an organic anti-settling agent, and is contained in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of other solid components. The coating composition according to the above.