JP2009096962A - Inkjet printing ink, and manufacturing method of electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide inkjet printing ink highly precisely and inexpensively forming a small-line width and fine wiring pattern of an FPD panel, and to provide a manufacturing method of electrode highly precisely and inexpensively forming an electrode being a panel member of the FPD. <P>SOLUTION: The inkjet printing ink contains (a) conductive powder and (b) a compound having at least one polymerizable unsaturated bond. Preferably, the inkjet printing ink contains (c) a photopolymerization initiator besides (a) and (b) described above. The manufacturing method of the electrode for FPD using the inkjet printing ink is also provided. According to the inkjet printing ink and the manufacturing method of electrode, not only the process can be simplified but also the time and cost can be reduced. The inkjet printing ink can be cured by heat or energy rays and, therefore, a pattern shape just after ejection can be maintained as it is. As the result, according to the inkjet printing ink and the manufacturing method of electrode, the electrode for the FPD having a small line width and highly precise pattern can be manufactured. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ink for inkjet printing and a method for producing a flat panel display member. More specifically, the present invention relates to an ink for inkjet printing suitable for forming an electrode constituting a flat panel display and a method for producing an electrode for FPD using the same.

  A flat panel display (hereinafter also referred to as “FPD”) such as a field emission display (hereinafter also referred to as “FED”) and a plasma display panel (hereinafter also referred to as “PDP”) is a large panel and can be easily manufactured. Because of its wide viewing angle, self-luminous type and high display quality, etc., it is attracting attention in flat panel display technology. Especially, color plasma display panels are for wall-mounted TVs of 30 inches or more. It is expected to become the mainstream in the future as a display device.

The FED is a display that displays information by causing a phosphor to emit light by emitting electrons from a cathode into a vacuum by applying an electric field and irradiating the electrons on the anode.
The color PDP can perform color display by irradiating phosphors with ultraviolet rays generated by gas discharge. In general, in a color PDP, a phosphor portion for red light emission, a phosphor portion for green light emission, and a phosphor portion for blue light emission are formed on a substrate, so that the light emitting display cells of each color are entirely formed. It is configured in a uniformly mixed state. Specifically, a partition made of an insulating material called a barrier rib is provided on the surface of a substrate made of glass or the like, and a large number of display cells are partitioned by the partition, and the inside of the display cell has a plasma action. It becomes space. Then, a phosphor part is provided in the plasma working space, and an electrode for causing plasma to act on the phosphor part is provided, whereby a plasma display panel having each display cell as a display unit is configured. The electrode is usually composed of a laminated pattern having a white conductive layer containing silver or the like and a dark color layer (black layer) having a role of an antireflection layer (light-shielding layer) below the white conductive layer. Usually, in order to improve the contrast of the PDP, a black matrix or a color filter is provided between the electrode patterns.

As a method for manufacturing a panel material in such an FPD, (1) a method using an ion sputtering method or an electron beam evaporation method, or (2) an inorganic powder-containing resin layer pattern formed by a photolithography method, a screen printing method, or the like. A method of baking and removing organic substances is known. Among them, a photolithography method using a photosensitive paste or a photosensitive dry film is preferably used because of high manufacturing efficiency and in principle excellent pattern accuracy.
Japanese Patent Laid-Open No. 11-162339 JP 2001-84833 A JP 2002-245932 A JP 2003-51250 A JP 2000-268716 A

However, the photolithography method is excellent in pattern accuracy, but requires processes such as exposure, development, and washing, and the processing of the developer is also expensive. In addition, most of the material is washed away by development, and it is difficult to recover expensive inorganic powder in the developer, which increases the cost. Moreover, a photomask used for exposure is necessary, and time and cost are required when changing the pattern design. In the screen printing method, the electrode pattern is printed directly on the substrate and it is a lean process. However, only the pattern line width of up to about 100 μm can be stably formed. There is a problem that it can not cope.

  In order to solve this problem, a method of forming a fine pattern having a line width of 100 μm or less using an ink jet method has been developed. However, in this method, when the line width becomes small, it becomes difficult to maintain the pattern shape, and there is a problem that the pattern cannot be formed with high accuracy.

The present invention has been made based on the above situation.
A first object of the present invention is to provide an ink for inkjet printing capable of forming a fine wiring pattern having a small line width of an FPD panel with high accuracy and low cost.

  A second object of the present invention is to provide an electrode manufacturing method capable of forming an electrode, which is a panel member of an FPD, with high accuracy and at low cost.

The present invention relates to achieving the above object, and comprises (a) conductive powder, (b)
An ink for ink-jet printing comprising a compound having at least one polymerizable unsaturated bond (hereinafter sometimes referred to as a polymerizable unsaturated compound).

  In addition, the present invention includes a step of forming a pattern by performing inkjet printing using the ink for inkjet printing, a step of obtaining a cured pattern by heating the pattern, and a step of baking the cured pattern. It is a manufacturing method of an electrode.

The ink for inkjet printing of the present invention may be characterized by containing (c) a photopolymerization initiator in addition to the above (a) and (b).
In this case, the manufacturing method of the electrode of the present invention includes a step of forming a pattern by inkjet printing using the ink for inkjet printing, a step of obtaining a cured pattern by irradiating the pattern with energy rays, and firing the cured pattern. The step of performing.

  In the ink jet method, ink is ejected only to a necessary portion on the substrate to form a member. Therefore, according to the ink jet printing ink and electrode manufacturing method of the present invention, not only can the process be simplified, Waste of material can be eliminated. In addition, it is possible to form a circuit directly by simply connecting a PC on which a CAD is drawn to an ink jet printer, thereby reducing time and cost. Moreover, since the ink for inkjet printing of this invention can be hardened | cured with a heat | fever or an energy ray, it becomes possible to maintain the pattern shape immediately after discharge as it is. For this reason, according to the ink for ink jet printing and the method for producing an electrode of the present invention, an electrode having a small line width and a highly accurate pattern can be produced.

Hereinafter, the present invention will be described in detail.
The ink for inkjet printing of this invention contains (a) electroconductive powder and (b) a polymerizable unsaturated compound, and can further contain (c) a photopolymerization initiator.

(A) Conductive powder The conductive powder of the present invention is not particularly limited. For the purpose of use of the sintered body formed by the ink for inkjet printing (type of FPD member), specification (resistance), and the like. It can be appropriately selected depending on the case. The conductive powder exhibiting excellent conductivity is one selected from gold, silver, copper, platinum, nickel, aluminum, palladium, iron, tin, indium metal fine particles, oxide fine particles thereof, and alloy fine particles. It is preferable to contain the above substances. Further, the average particle diameter (D50) of the conductive powder is preferably 0.05 μm or more and 5 μm or less from the viewpoints of ink dispersibility, sedimentation, ejection from an inkjet nozzle, patterning accuracy, and cost.

In the ink for inkjet printing of the present invention, the amount of the conductive powder (a) used is 10 to 90% by mass, preferably 30 to 80% by mass, based on the total amount of the ink.
(B) Polymerizable unsaturated compound As the polymerizable unsaturated compound in the present invention, a compound having at least one methacryloyl group (CH ₂ ═C (CH ₃ ) —CO—) as the polymerizable unsaturated group (hereinafter referred to as “ Methacrylic compound ”), a compound having at least one acryloyl group (CH ₂ ═CH—CO—) (hereinafter referred to as“ acrylic compound ”), and at least one vinyl group (CH ₂ ═CH—). Compounds (hereinafter referred to as “vinyl compounds”). Here, the advantage of using a polymerizable unsaturated compound is that a pattern formed by inkjet discharge can be crosslinked by heat or cured by energy rays such as ultraviolet rays to maintain the pattern shape immediately after discharge. It is to become.

  Methacrylic compounds include ethylene glycol dimethacrylate, ethylene glycol monomethacrylate, diethylene glycol dimethacrylate, diethylene glycol monomethacrylate, triethylene glycol dimethacrylate, triethylene glycol monomethacrylate, tetraethylene glycol dimethacrylate, tetraethylene glycol monomethacrylate, 1, 3-propanediol dimethacrylate, 1,3-propanediol monomethacrylate, 1,4-butanediol dimethacrylate, 1,4-butanediol monomethacrylate, 1,5-pentanediol dimethacrylate, 1,5-pentanediol mono Methacrylate, 1,6-hexanediol dimethacrylate, 1,6-hexanediol It can be mentioned mono-methacrylate, but is not limited thereto.

  Among these methacrylic compounds, ethylene glycol dimethacrylate, ethylene glycol monomethacrylate, diethylene glycol dimethacrylate, diethylene glycol monomethacrylate, triethylene glycol dimethacrylate, triethylene glycol monomethacrylate, 1,3-propane are low in viscosity. Diol dimethacrylate, 1,3-propanediol monomethacrylate, 1,4-butanediol dimethacrylate, 1,4-butanediol monomethacrylate and the like are preferable, and ethylene glycol dimethacrylate and diethylene glycol dimethacrylate are particularly preferable. In this invention, a methacryl type compound can be used individually or in mixture of 2 or more types.

  Specific examples of acrylic compounds include tetrahydrofurfuryl acrylate, 2-phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, isobornyl acrylate, ethylene glycol ditalylate, ethylene glycol monoacrylate, diethylene glycol diacrylate, diethylene glycol monoacrylate, triethylene Glycol diacrylate, triethylene glycol monoacrylate, tetraethylene glycol diacrylate, tetraethylene glycol monoacrylate, polyethylene glycol monoacrylate (5 to 9 ethylene glycol units), tripropylene glycol diacrylate, polypropylene glycol diacrylate (pro The number of units of prene glycol is 5 14), 1,3-propanediol diacrylate, 1,3-propanediol monoacrylate, 1,4-butanediol diacrylate, 1,4-butanediol monoacrylate, 1,5-pentanediol diacrylate, 1, 5-pentanediol monoacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol monoacrylate, dimethylol tricyclodecane diacrylate, monomethylol tricyclodecane monoacrylate, trimethylolpropane monoacrylate, trimethylolpropane Diacrylate, trimethylolpropane triacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipenta Examples include, but are not limited to, lithitol pentaacrylate, dipentaerythritol hexaacetate, ethoxylated pentaerythritol tetacrylate (tetacrylate of addition reaction product of pentaerythritol and ethylene oxide), and the like. .

  Of these acrylic compounds, isobornyl acrylate, tetraethylene glycol diacrylate, tetraethylene glycol monoacrylate, polyethylene glycol diacrylate, polyethylene glycol monoacrylate, 1,6-hexanediol are low skin irritation. Diacrylate, 1,6-hexanediol monoacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ethoxylated pentaerythritol tetraacrylate, etc. are preferred, especially isobornyl acrylate, tetraethylene glycol diacrylate Acrylate, tetraethylene glycol monoacrylate, polyethylene glycol monoacrylate, Data pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ethoxylated pentaerythritol tetraacrylate are preferred.

  Specific examples of vinyl compounds include N-vinyl pyrrolidone, N-vinyl-ε-caprolactam, ethylene glycol divinyl ether, ethylene glycol monovinyl ether, diethylene glycol divinyl ether, diethylene glycol monovinyl ether, triethylene glycol divinyl ether, triethylene. Examples include, but are not limited to, glycol monovinyl ether, tetraethylene glycol divinyl ether, tetraethylene glycol monovinyl ether, 2- (2-vinyloxyethoxy) ethyl acrylate, 2- (2-vinyloxyethoxy) ethyl methacrylate, and the like. Is not to be done.

  Among these vinyl compounds, N-vinylpyrrolidone, N-vinyl-ε-caprolactam, ethylene glycol divinyl ether, ethylene glycol monovinyl ether, diethylene glycol divinyl ether, diethylene glycol monovinyl ether, triethylene glycol are used because of their low viscosity. Divinyl ether, triethylene glycol monovinyl ether, 2- (2′-vinyloxyethoxy) ethyl acrylate, 2- (2′-vinyloxyethoxy) ethyl methacrylate and the like are preferable, and in particular, N-vinylpyrrolidone, N-vinyl-ε. -Caprolactam, diethylene glycol divinyl ether, diethylene glycol monovinyl ether, triethylene glycol divinyl ether, triethylene glycol monovinyl Ether, 2- (2-vinyloxyethoxy) ethyl acrylate, 2- (2-vinyloxyethoxy) ethyl methacrylate are preferred.

The said polymerizable unsaturated compound can be used individually or in mixture of 2 or more types. These can be used alone or in combination of two or more.
In the inkjet printing ink of the present invention, the amount of the (b) polymerizable unsaturated compound used is 30 to 300 parts by mass of (b) the polymerizable unsaturated compound with respect to 100 parts by mass of the conductive powder. The amount is preferably 50 to 200 parts by mass.

(C) Photopolymerization initiator As the photopolymerization initiator of the present invention, for example,
Benzyl, benzoin, benzophenone, camphorquinone, 2,2-dimethoxy-1,2-diphenylethane-1-one, 4,4′-bis (dimethylamino) benzophenone, 4,4′-bis (diethylamino) benzophenone, 2, -Hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2-methyl-1- [4 '-(methylthio) phenyl]- Carbonyl compounds such as 2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one;
Azoisobutyronitrile, 4-azidobenzaldehyde and ethanone-1- [9-ethyl-6- [2-methyl-4- (2,2-dimethyl-1,3-dioxolanyl) methoxybenzoyl] -9. H. An azo compound or an azide compound such as -carbazol-3-yl] -1- (O-acetyloxime);
Organic sulfur compounds such as 2-mercaptobenzothiazole and mercaptan disulfide;
Organic peroxides such as benzoyl peroxide, di-tert-butyl peroxide, tert-butyl hydroperoxide, cumene hydroperoxide and paraffin hydroperoxide;
1,3-bis (trichloromethyl) -5- (2'-chlorophenyl) -1,3,5-triazine and 2- [2- (2-furanyl) ethylenyl] -4,6-bis (trichloromethyl)- Trihalomethanes such as 1,3,5-triazine;
2,2′-bis (2-chlorophenyl) 4,5,4 ′, 5′-tetraphenyl1,2 ′
An imidazole dimer such as biimidazole;
Thioxanthone compounds such as 2-isopropylthioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone;
Phosphine oxide compounds such as 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide;
O-acyl oxime compounds such as 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)] and the like can be mentioned.

In this invention, a photoinitiator can be used individually or in mixture of 2 or more types.
In the ink for inkjet printing of the present invention, the amount of (c) photopolymerization initiator used is 0.1 to 30 parts by mass of (c) photopolymerization initiator with respect to 100 parts by mass of the polymerizable unsaturated compound. Preferably, it is 0.5-20 mass parts.

  Moreover, you may add binder glass to the ink for inkjet printing of this invention for the purpose of raising the adhesiveness with the board | substrate after baking, and the mechanical strength of a structure. Examples of the binder glass for achieving these objects include glass powders having a softening point in the range of 350 to 700 ° C. (preferably 400 to 620 ° C.). When the softening point of the glass powder is less than 400 ° C., the glass powder melts at a stage where an organic substance such as a plasticizer is not completely decomposed and removed in the firing process of the ink film for ink jet printing by the composition. Therefore, a part of the organic substance remains in the formed member, and as a result, there is a possibility that the resistance value increases. On the other hand, when the softening point of the glass powder exceeds 620 ° C., the glass substrate needs to be baked at a temperature higher than 620 ° C., so that the glass substrate is likely to be distorted.

Specific examples of suitable glass powder include
1. A mixture of lead oxide, boron oxide, silicon oxide (PbO—B ₂ O ₃ —SiO ₂ system),
2. A mixture of zinc oxide, boron oxide, silicon oxide (ZnO—B ₂ O ₃ —SiO ₂ system),
3. Lead oxide, boron oxide, silicon oxide, aluminum oxide (PbO—B ₂ O ₃ —SiO ₂ —
A mixture of Al ₂ O ₃ system),
4). A mixture of lead oxide, zinc oxide, boron oxide, silicon oxide (PbO—ZnO—B ₂ O ₃ —SiO ₂ system),
5). A mixture of bismuth oxide, boron oxide, silicon oxide (Bi ₂ O ₃ —B ₂ O ₃ —SiO ₂ system),
6). A mixture of zinc oxide, phosphorus oxide, silicon oxide (ZnO—P ₂ O ₅ —SiO ₂ system),
7). A mixture of zinc oxide, boron oxide, potassium oxide (ZnO—B ₂ O ₃ —K ₂ O system),
8). A mixture of phosphorus oxide, boron oxide, aluminum oxide (P ₂ O ₅ —B ₂ O ₃ —Al ₂ O ₃ system),
9. Zinc oxide, phosphorus oxide, silicon oxide, aluminum oxide (ZnO—P ₂ O ₅ —SiO ₂ —
A mixture of Al ₂ O ₃ system),
10. A mixture of zinc oxide, phosphorus oxide, titanium oxide (ZnO—P ₂ O ₅ —TiO ₂ system),
11. A mixture of zinc oxide, boron oxide, silicon oxide, potassium oxide (ZnO—B ₂ O ₃ —SiO ₂ system—K ₂ O system),
12 A mixture of zinc oxide, boron oxide, silicon oxide, potassium oxide, calcium oxide (ZnO—B ₂ O ₃ —SiO ₂ —K ₂ O—CaO system),
13. Examples thereof include a mixture of zinc oxide, boron oxide, silicon oxide, potassium oxide, calcium oxide, and aluminum oxide (ZnO—B ₂ O ₃ —SiO ₂ —K ₂ O—CaO—Al ₂ O ₃ system).

The glass powder preferably has an average particle size (D50) of 0.1 to 5 μm. Moreover, it is preferable that the addition amount of the said glass powder is 0-20 mass parts with respect to 100 mass parts of (a) electroconductive powder.

  Furthermore, the ink for inkjet printing of the present invention may contain a solvent for adjusting viscosity, a plasticizer, an acrylic resin, and a cellulose resin as optional components other than the binder glass. Also, silane coupling agents for improving adhesion to substrates, dispersants aimed at improving dispersibility and suppressing sedimentation, adhesion aids, antihalation agents, leveling agents, storage stabilizers, antifoaming agents, antioxidants Various additives such as an ultraviolet absorber, a sensitizer, a tackifier, a surface tension adjuster, and a drying inhibitor may be contained.

The ink for inkjet printing of the present invention comprises the above (a) conductive powder and (b) polymerizable unsaturated compound, or (a) conductive powder, (b) polymerizable unsaturated compound and (c) photopolymerization initiator. If necessary, the above-mentioned optional components can be prepared by kneading using a kneader such as a roll kneader, a mixer, a homomixer, a ball mill, or a bead mill.

  The ink for inkjet printing prepared as described above is an ink-like composition having fluidity suitable for ejection by inkjet, and its viscosity is usually 1 to 1,000 cP at 25 ° C., preferably 3 to 3 100 cP.

  The ink for ink jet printing of the present invention can be used for any type of ink jet without being particularly limited, such as a piezo type, a bubble jet (registered trademark) type, and a beam jet type.

The ink for inkjet printing of this invention can be used suitably for manufacture of the member which requires electroconductivity, especially manufacture of the electrode for PDP.
Here, the manufacturing method of the electrode using the ink for inkjet printing of this invention is demonstrated. This electrode manufacturing method basically uses [1] a step of forming a pattern by printing the ink of the present invention on the surface of a printing material by an inkjet method, and [2] exposure of heat or energy rays. Then, the ink is crosslinked and cured to form a cured pattern, and [3] a step of firing the cured pattern. The term “energy beam” as used in the present invention means one including ultraviolet rays, far ultraviolet rays, X-rays, electron beams, molecular beams, γ rays, synchrotron radiation, proton beam rays and the like.

  Hereinafter, the respective steps in the bus electrode formation process on the front substrate of the plasma display panel will be described. Other electrodes can be formed basically in the same manner.

-[1] Process-
The formation of the pattern in the present invention can be performed according to a pattern forming method by a known ink jet method. For example, by ejecting ink from an inkjet head while moving the glass substrate or inkjet head on a transparent electrode formed on a glass substrate (for example, Asahi Glass PD200) as a printing material, Form the desired pattern. At this time, the drawing time is shortened by increasing the number of nozzles, and the electrodes can be formed efficiently.

When a cured pattern is obtained by heating in the next step [2], an ink for inkjet printing containing at least (a) conductive powder and (b) a polymerizable unsaturated compound is used, and cured by irradiation with energy rays. When obtaining a pattern, an ink for inkjet printing containing at least (a) conductive powder, (b) a polymerizable unsaturated compound, and (c) a photopolymerization initiator is used.

  In this step, it is desirable to maintain the printing ink and the nozzle head at a constant temperature, for example, usually 10 to 100 ° C., preferably 15 to 60 ° C. so that stable continuous ejection is possible.

Further, the discharge amount of the printing ink from the nozzle is, for example, usually 2 to 15 picoliter / second, preferably 4 to 12 picoliter / second.

-[2] Process-
The pattern is crosslinked or cured by heating or exposure to form a cured pattern.
The crosslinking by heat is desirably performed usually at 80 to 200 ° C. for 1 to 15 minutes after the landing of the printing ink.
Curing by exposure is usually performed for 0.001 to 2.0 seconds, preferably 0.001 to 1.0 seconds after the landing of the printing ink. In order to perform high-definition printing, an earlier exposure timing is appropriate.

As energy rays used for exposure, for example, ultraviolet rays, far ultraviolet rays, X-rays, electron beams, molecular beams, γ rays, synchrotron radiation, proton beam rays and the like can be used, but usually 200 to 500 nm, preferably Is preferably ultraviolet light having a wavelength of 240 to 420 nm. The exposure amount is usually 1 to 1000 mJ / cm ² . As an exposure method, for example, a method described in Japanese Patent Application Laid-Open No. 60-132767 and US Pat. No. 6,145,579, more specifically, a shuttle method or a fiber method can be employed.
In printing, it may be printed in a single layer or multiple layers. In the case of printing in multiple layers, it is desirable to perform thermal crosslinking or photocuring each time after printing each layer.

-[3] Process-
In this step, the inorganic powder-containing resin pattern layer, which is a cured pattern layer, is fired. As a result, the organic material remaining in the resin pattern layer is burned off to form an electrode.

The temperature of the baking treatment needs to be a temperature at which the organic material in the resin layer residual portion is burned off, and is usually 400 to 600 ° C. The firing time is usually 10 to 90 minutes.
Examples of the present invention will be described below, but the present invention is not limited to these examples. In the following, “part” means “part by mass”.

(A) 100 parts of silver powder (average particle size (D50) 0.5 μm) as the conductive powder, (b) 100 parts of N-vinylpyrrolidone, tripropylene glycol disulfide as a compound having at least one polymerizable unsaturated bond Ink jet printing ink was prepared by using 100 parts of acrylate and 5 parts of oleic acid as a dispersant, kneading them using a disperser, and filtering through a 2000 mesh filter. The obtained ink was ejected onto a glass substrate from a nozzle head (SE-128, manufactured by Dimatix) from a nozzle head having a nozzle diameter of 35 μm using an inkjet patterning device (manufactured by Microjet, NanoPrinter-1500S). A pattern was printed. Then, after baking for 10 minutes in a clean oven at 150 ° C., the pattern was observed with a scanning electron microscope, and it was confirmed that a fine pattern with a line width of 80 μm and a height of 5 μm was obtained. It was done.

  By firing the cured pattern thus obtained at 600 ° C. for 30 minutes, it was possible to produce a highly accurate electrode having a small line width and maintaining the original pattern shape.

(A) 100 parts of silver powder (average particle size (D50) 0.5 μm) as the conductive powder, (b) 100 parts of N-vinylpyrrolidone, tripropylene glycol disulfide as a compound having at least one polymerizable unsaturated bond 100 parts of acrylate, (c) As a photopolymerization initiator, 2-methyl-1- [4 ′-(methylthio) phenyl] -2-morpholinopropan-1-one 4 parts, 2,4-diethylthioxanthone 2 parts, Inkjet printing ink was prepared by using 5 parts of oleic acid as a dispersant, kneading them using a disperser, and filtering with a 2000 mesh filter. The obtained ink was discharged onto a glass substrate using the inkjet discharge device, and a conductive pattern was printed. Then, the mixed light of g line (436 nm), h line (405 nm), and i line (365 nm) was irradiated with the ultrahigh pressure mercury lamp. The exposure amount at that time was 20 J / m ^{2 in} terms of illuminance measured by a 365 nm sensor. Observation of the exposed pattern with a scanning electron microscope confirmed that a fine pattern with a line width of 75 μm and a height of 5 μm was obtained.

By firing the cured pattern thus obtained at 600 ° C. for 30 minutes, it was possible to produce a highly accurate electrode having a small line width and maintaining the original pattern shape.
[Comparative example]

(A) 100 parts of silver powder (average particle size (D50) 0.5 μm) as the conductive powder, 200 parts of di-2-ethylhexyl azelate as the plasticizer, and 5 parts of oleic acid as the dispersant are used. These were kneaded using, and filtered through a 2000 mesh filter to prepare ink for inkjet printing. The obtained ink was discharged onto a glass substrate using the inkjet discharge device, and a conductive pattern was printed. Thereafter, when the pattern was observed with a scanning electron microscope, it was confirmed that a pattern having a line width of 100 μm and a height of 5 μm was obtained, but uneven distribution of silver particles and disorder of linearity were observed. .

When the cured pattern thus obtained was baked at 600 ° C. for 30 minutes, it was not possible to produce an electrode having a small line width and a highly accurate pattern as in the above example.

Claims (4)

An ink for ink-jet printing comprising (a) a conductive powder and (b) a compound having at least one polymerizable unsaturated bond. (A) conductive powder, (b) a compound having at least one polymerizable unsaturated bond, and (c)
) An ink for ink jet printing comprising a photopolymerization initiator. Forming a pattern by ink jet printing on the substrate using the ink for ink jet printing according to claim 1,
Heating the pattern to obtain a cured pattern; and firing the cured pattern;
The manufacturing method of the electrode for FPD characterized by including these. Forming a pattern by inkjet printing on the substrate using the inkjet printing ink according to claim 2;
Irradiating the pattern with energy rays to obtain a cured pattern; and firing the cured pattern;
The manufacturing method of the electrode for FPD characterized by including these.