JP2014524946A - Phase change ink composition and conductive pattern using the same - Google Patents

Abstract

The present invention includes a metal nanoparticle, a dispersant that stably disperses the metal nanoparticle, the metal nanoparticle and the dispersant, and at least two sulfur-containing compounds. A phase change ink composition having a melting temperature of 60 ° C to 90 ° C.
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Description

  The present invention relates to a phase change ink composition and a conductive pattern using the same, and more specifically, a melting temperature is as low as 60 ° C. to 90 ° C., and a normal inkjet head is used when forming a conductive pattern. The present invention relates to a phase change ink composition that can be formed and a conductive pattern using the same.

  As a general process method for manufacturing a conductive pattern, optical patterning using lithography has been mainly used. However, optical patterning involves complicated process steps and high costs, and there is a problem of environmental pollution because harmful gases and waste water are discharged during the exposure and etching processes. Therefore, a low-cost and environment-friendly pattern forming method that replaces this has been studied, and a representative example is an inkjet printing method.

  The inkjet printing method is a method in which a desired pattern is directly drawn on a substrate. Since the process steps are simple and large-area printing is easy, the process time can be reduced and the production cost can be greatly reduced. Further, unlike the existing optical patterning method, it is an environment-friendly patterning method that does not discharge environmental pollutants because there is no exposure or etching process.

  In order to form a conductive pattern by the ink jet printing method, a conductive ink having a low viscosity capable of forming a conductive line is required. For this reason, conductive metal nanoparticles are used as a material for the ink composition.

  However, when the metal nanoparticles are used as a material for the ink composition, the metal has a specific gravity larger than that of the organic solvent, so that the metal nanoparticles are precipitated and the storage stability is not good.

  Although reducing the size of the metal nanoparticles is effective in slowing sedimentation by Brownian motion, this is not a fundamental solution. In addition, there is a method in which a stirrer is continuously used to prevent sedimentation of metal nanoparticles, but this involves difficulty due to an increase in cost because the stirring facility must be operated at all times.

  Increasing the viscosity of the ink can slow down the settling rate of the metal nanoparticles, and further solidifying the ink can completely stop the settling of the metal nanoparticles. Accordingly, research has been conducted on an ink composition that is solid at normal temperature, becomes liquid in the temperature increase range allowed for the ink jet apparatus, and maintains a viscosity of 20 cP or less at the jetting temperature.

  As a result, an ink composition having a wax component as a main component has been developed as a phase change ink, and the melting temperature of the ink composition exceeds 90 ° C. When the melting temperature of the ink composition exceeds 90 ° C., it is necessary to maintain the temperature of the ink jet head at 100 ° C. or higher in consideration of tolerances, which exceeds 90 ° C. acceptable for most ink jet heads. . Therefore, when using the phase change ink, there is a disadvantage in that a specially designed ink jet head must be used. In addition, the wax, which is the main component, is mostly nonpolar and does not dissolve in water, is well dissolved only in nonpolar solvents, and is not mixed when polar additives used in general inks are used. There are problems such as separation.

  An object of the present invention is to provide a phase change ink composition that can use an ordinary inkjet head and an additive having a polar molecular structure that cannot be used with an existing phase change ink, and a conductive pattern using the same. It is.

  In order to solve the above-mentioned problem, a first aspect of the present invention includes metal nanoparticles, a dispersant, and a solvent containing at least two kinds of sulfur-containing compounds, and a melting temperature is 60 ° C to 90 ° C. A phase change ink composition is provided.

  The phase change ink composition may include 20 to 70 parts by weight of the metal nanoparticles, 1 to 10 parts by weight of the dispersant, and 20 to 79 parts by weight of the solvent.

  The surface of the metal nanoparticles can be capped with the dispersant.

  The sulfur-containing compound can be a sulfone group-containing compound.

  The solvent may be a mixture of a first solvent having a melting point of 80 ° C. to 200 ° C. and a second solvent having a melting point of 0 to 40 ° C.

  The first solvent is dimethyl sulfone (hereinafter referred to as “dimethyl sulfone”), the second solvent is sulfolane (hereinafter referred to as “sulfolane”), and the first solvent. The ratio of the second solvent to the second solvent is preferably 1: 0.75 to 1: 1.5.

  The metal nanoparticles include at least one selected from the group consisting of gold, silver, copper, nickel, zinc, platinum, tin, chromium, palladium, cobalt, titanium, molybdenum, iron, manganese, tungsten, and aluminum. Can do.

  The viscosity of the phase change ink composition may be 1 to 20 cP at a melting temperature of 60 ° C. to 90 ° C.

  The second aspect of the present invention provides a conductive pattern formed using the phase change ink composition.

  Note that the means for solving the above-described problems are not all of the features of the present invention. The various features of the present invention and the advantages and advantages thereof will be better understood with reference to the following specific embodiments.

  The phase change conductive ink composition of the present invention is capable of adjusting the melting temperature within the allowable temperature range of a normal inkjet head and can use a polar additive, so it is excellent in terms of product development and quality control, Since the solid state is maintained at room temperature, the metal nanoparticles are prevented from settling and the storage stability is increased.

  In the following, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

  The phase change ink composition of the present invention comprises 1) metal nanoparticles, 2) a dispersant that stably disperses the metal nanoparticles, and 3) the metal nanoparticles and the dispersant are mixed. And a solvent containing at least two kinds of sulfur-containing compounds, wherein the melting temperature is 60 ° C. to 90 ° C.

  Alternatively, the melting temperature may be 65 ° C to 75 ° C or 65 ° C to 70 ° C.

  On the other hand, in the specification of the present invention, the phase change ink composition is in a solid state substantially non-flowable at a temperature of about 20 ° C. to about 27 ° C., for example, room temperature. However, when the ink composition is heated, the phase changes from a solid to a liquid in a temperature range of 60 ° C. to 90 ° C., and particularly exists in a liquid state at an ejection temperature.

  More specifically, the ink composition of the present invention includes 1) 20 to 70 parts by weight of metal nanoparticles, 2) 1 to 10 parts by weight of a dispersant, and 3) 20 to 79 parts by weight of a solvent. Is preferred.

  Meanwhile, the solvent may be a polar solvent. Since the phase change ink used conventionally used nonpolar wax as a main component, nonpolar solvent was used as a solvent. However, when such a nonpolar solvent is used, there is a possibility that a polar additive cannot be used. On the other hand, by using a polar solvent as a solvent, a polar additive used in a normal ink composition can be used.

  For example, the sulfur-containing compound can be a sulfone group-containing compound. That is, the phase change ink composition of the present invention comprises 1) metal nanoparticles, 2) a dispersant that stably disperses the metal nanoparticles, and 3) the metal nanoparticles and the dispersant. And a solvent containing at least two kinds of sulfone group compounds, and having a melting temperature of 60 ° C. to 90 ° C.

  Moreover, the said solvent can contain the 1st solvent whose melting point is 80 to 200 degreeC, and the 2nd solvent whose melting point is 0 to 40 degreeC. More specifically, the solvent may be a mixture of a first solvent having a melting point of 80 ° C. to 200 ° C. and a second solvent having a melting point of 0 to 40 ° C.

  The first solvent is methyl phenyl sulfone (melting point 85 ° C.), diphenyl sulfone (melting point 123 ° C.), dimethyl sulfone (melting point 109 ° C.), 4,4′-dichlorodiphenyl sulfone (melting point 143 ° C.), It can be di-p-tolylsulfone (melting point 160 ° C.) or 4-aminophenyl sulfone (melting point 175 ° C.), but is not necessarily limited thereto. The second solvent may be sulfolane (melting point 27.5 ° C.).

  Specifically, the first solvent can be dimethyl sulfone and the second solvent can be sulfolane. More specifically, the solvent of the present invention can be a mixture of dimethyl sulfone and sulfolane. Dimethylsulfone is a polar solvent that is solid at room temperature, and sulfur and oxygen atoms contained in dimethylsulfone exhibit a strong polarity. Therefore, when dimethyl sulfone is used as a solvent, an ink containing a polar additive can be produced. Further, since the melting point of dimethyl sulfone is 109 ° C., it can maintain a solid state at room temperature, which is higher than the maximum 90 ° C. which is a temperature range in which a general inkjet head can be used. Therefore, the melting temperature of the phase change ink composition can be adjusted by mixing and using sulfolane having a good compatibility with dimethyl sulfone and a low melting point as a polar solvent.

  At this time, the ratio of the first solvent to the second solvent may be 1: 0.75 to 1: 1.5. For example, the dimethyl sulfone and sulfolane may have a mixing ratio of 1: 0.75 to 1: 1.5. The melting temperature can be adjusted to a low level by increasing the content of the second solvent, but if the second solvent is mixed less than 0.75 times the first solvent, the produced phase mutation Since the melting temperature of the ink composition is higher than 90 ° C., it is difficult to use a normal inkjet head, and it was manufactured when the second solvent was mixed more than 1.5 times the first solvent. Since the melting temperature of the phase change ink composition is lower than 60 ° C., a phenomenon may occur in which the ink spreads without being rapidly solidified on the surface of the substrate after the ink is jetted.

  Therefore, the melting temperature of the phase change ink composition can be adjusted depending on the type of the inkjet head used. For example, the melting temperature can be adjusted to a maximum of 70 ° C. when using a Dimatix DMC-11610 / DMC-11601 inkjet head, and the melting temperature can be adjusted to a maximum of 90 ° C. when using a Dimatix Nova inkjet head. The maximum temperature that can be used in other company or model inkjet heads is specified by the manufacturer and is generally between 60 ° C and 90 ° C.

  The phase change ink composition of the present invention preferably has a viscosity of 1 to 20 cP or less at the melting temperature. In terms of stable ink ejection and smooth driving of the inkjet equipment, the viscosity at the operating temperature is preferably within the above numerical range.

  Meanwhile, the solvent may be 20 to 79 parts by weight with respect to 100 parts by weight of the phase change ink composition. Preferably it is 20-70 weight part or 50-79 weight part, More preferably, it can be 60-75 weight part. At this time, when the content of the solvent is less than 20 parts by weight, the ratio of the metal nanoparticles in the phase change ink composition is very high. Is greater than 79 parts by weight, the ratio of the metal nanoparticles in the phase change ink composition is very low, so the conductivity of the formed pattern is low.

  Next, the average particle size of the metal nanoparticles of 1) may be 2 nm to 500 nm.

  The metal nanoparticles include, for example, at least one selected from the group consisting of gold, silver, copper, nickel, zinc, platinum, tin, chromium, palladium, cobalt, titanium, molybdenum, iron, manganese, tungsten, and aluminum. Can be included. The metal nanoparticles are pure metals themselves or alloys thereof such as gold, silver, copper, nickel, zinc, platinum, tin, chromium, palladium, cobalt, titanium, molybdenum, iron, manganese, tungsten, or aluminum. However, it is not limited to this.

  The metal nanoparticles may be 20 to 70 parts by weight with respect to 100 parts by weight of the phase change ink composition. Preferably it is 20-50 weight part or 40-70 weight part, More preferably, it can be 25-35 weight part. At this time, when the content of the metal nanoparticles is less than 20 parts by weight, the electric conductivity of the ink is not sufficient, and when the content of the metal nanoparticles is more than 70 parts by weight, it is difficult to disperse the metal nanoparticles. become.

  On the other hand, a polymer capping layer can be introduced on the surface of the metal nanoparticles so as to maintain dispersibility in a solvent. For example, metal nanoparticles capped with a polymer can be produced by a polyol synthesis method, and the method is disclosed in documents such as Nanotechnology, Vol. 17, 4019-4024, which was written by Dongjo Kim et al.

  On the other hand, the phase change ink composition of the present invention includes 2) a dispersant in order to stably disperse and arrange the metal nanoparticles in the solvent. For example, the dispersant is polyvinylpyrrolidone, a compatibilizing dispersant BYK disperBYK, disperBYK-101, 102, 103, 106, 107, 108, 109, 110, 111, 112, 115, 116, 130, 140. 142, 145, 160, 161, 162, 163, 164, 166, 167, 168, 169, 170, 171, 174, 180, 181, 182, 183, 184, 185, 187, 190, 191, 192, 193 , 194, 198, 199, 2000, 2001, 2008, 2009, 2010, 2012, 2015, 2020, 2022, 2025, 2050, 2059, 2070, 2090, 2095, 2096, 2117, 2118, 2150, 2151, 2155, 2163 2164, BYKJET-9130, 9131, 9132, 9133, 9150, 9170, Evonic's Tego Dispers 741W, 750W, 755W, 650, 652, 653, 656, 670, 685, Lubrizol's Solsperse 11200, 12000, 1324013 13650, 13940, 16000, 17000, 17940, 18000, 19000, 19200, 20000, 21000, 22000, 24000, 26000, 27000, 28000, 30000, 32000, 32500, 32600, 34750, 35000, 35100, 35200, 36000, 36600 37500, 38500, 39000, 40000, 41000, 410 90, 43000, 44000, 46000, 47000, 50000, 53055, 54000, 71000, 76500, 8000, 8100, 8200, 9000, RM50, X300 and at least one selected from the group of other company products be able to. As the dispersant, polyvinyl pyrrolidone is preferable. However, since the other compatibilizing dispersants described above or the dispersants or wetting agents not described above can also have an effect similar to that of polyvinyl pyrrolidone, the present invention is a kind of dispersant. Is not limited.

  In the present invention, the surface of the metal nanoparticles may be capped with the dispersant. The crystal growth of the metal nanoparticles can be adjusted by the capping. For example, the dispersing agent selectively surrounds a specific crystal plane of the metal nanoparticles as a capping molecule, so that the effect of adjusting the growth direction of the nanoparticles and preventing aggregation between the metal nanoparticles can be obtained. For example, the surface of the metal nanoparticles can be capped with polyvinyl pyrrolidone. At this time, the polyvinyl pyrrolidone can be used as a capping molecule in a polyol synthesis method and can serve as a dispersant.

  The dispersing agent of 2) can be contained in an amount of 1 to 10 parts by weight, preferably 1 to 7 parts by weight or 3 to 10 parts by weight, more preferably 2 to 5 parts by weight. At this time, when the dispersant is less than 1 part by weight, there is a problem that the dispersion of the metal nanoparticles is not properly performed. When the dispersant exceeds 10 parts by weight, the viscosity of the ink is increased, so that the jet is jetted. There is a problem that it is difficult to do.

  The present invention also provides a conductive pattern formed using the phase change ink composition. The conductive pattern is obtained by heating and melting a solid phase phase change ink composition, spraying a liquid phase change ink composition on a substrate, and then heating the ink composition sprayed on the surface of the substrate. Is formed. On the other hand, during the heat treatment, the phase change ink composition may be melted and flowed. However, since the metal particles are not greatly affected by the melting of the ink composition due to the pinning phenomenon that sticks as soon as it hits the surface of the substrate, the phase change ink composition of the present invention is excellent. A fine pattern showing conductivity can be formed.

  At this time, since the droplets of the ejected ink composition are as small as 100 pl or less, the phenomenon of solidifying immediately after falling on the base material and suppressing the phenomenon of spreading on the base material is formed, and a fine conductive pattern is formed. Is advantageous. The normal phase change ink has a droplet shape in which the surface energy of the substrate and the surface tension of the ink reach an equilibrium state, whereas the phase change ink composition of the present invention reaches the above equilibrium. Since the ink composition is solidified before and the shape is fixed, the shape of the ink composition is not greatly affected by the surface energy of the substrate. Therefore, there is an excellent effect that precise surface energy treatment of the substrate can be omitted.

  On the other hand, the conductive pattern formed with the conventional ink composition has a line width that varies greatly depending on the surface energy of the substrate, and may spread up to about four times the effective nozzle diameter of the ink jet. Whereas the implementation of the pattern is disadvantageous, the conductive pattern formed using the phase change ink composition of the present invention has a relatively constant width corresponding to 1.5 to 2 times the effective nozzle diameter of the inkjet. A fine conductive pattern can be realized.

  On the other hand, the present invention provides a method for producing a phase change ink composition comprising metal nanoparticles, a dispersant, and a solvent containing at least two kinds of sulfur-containing compounds and having a melting temperature of 60 ° C. to 90 ° C. provide.

  The production method is, for example, a method of mixing metal nanoparticles, a dispersant, and a solvent containing at least two kinds of sulfur-containing compounds. At this time, the solvent containing at least two kinds of sulfur-containing compounds is the above-mentioned It can be a mixture of a first solvent and a second solvent.

  On the other hand, in the present invention, the metal nanoparticles, the dispersant and the solvent containing at least two kinds of sulfur-containing compounds can be mixed at the same time, and the metal nanoparticles and the dispersant are mixed in an organic solvent to disperse the metal nanoparticles. After the liquid is formed, a solvent containing at least two kinds of sulfur-containing compounds can be mixed with the dispersion. More specifically, it is not particularly limited. For example, the metal nanoparticles and the dispersant are first mixed in an organic solvent, and the dispersant is capped on the surface of the metal nanoparticles using a polyol synthesis method. After passing through the steps, the phase-change ink composition of the present invention can be produced by sequentially mixing the solvent containing at least two kinds of sulfur-containing compounds, that is, the first solvent and the second solvent.

  At this time, since the organic solvent used in the capping step or dispersion formation must be removed after mixing the first solvent, it is preferable to use a solvent having a lower boiling point than that of the first solvent. At this time, the organic solvent can be removed by evaporation or centrifugation.

  Specifically, the present invention includes a step of mixing a metal nanoparticle, a dispersant, a first solvent, and a solvent having a boiling point lower than that of the first solvent to form a composition, and the first solvent. There is provided a method for producing a phase change ink composition comprising the steps of evaporating a solvent having a low boiling point and mixing a second solvent in the composition having the solvent having a low boiling point evaporated.

  The present invention also includes a step of mixing a metal nanoparticle, a dispersant, and a solvent having a boiling point lower than that of the first solvent to form a composition, and a solvent having a boiling point lower than that of the first solvent by centrifugation. Removing the metal nanoparticles and the dispersing agent, and mixing the metal nanoparticles and the dispersing agent obtained by the centrifugal separation method with the first solvent and the second solvent to form a composition. A method for producing a phase change ink composition is provided.

  Hereinafter, preferred embodiments will be presented for understanding of the present invention. However, the following examples are provided to facilitate understanding of the present invention, and the contents of the present invention are not limited thereby.

1. Production of ink composition Production Example 1-E1
In a flask in which nitrogen was passed after mixing 50 g of an ethylene glycol (boiling point 197 ° C.) solution containing 50 wt% of silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method with 25 g of dimethyl sulfone (boiling point 238 ° C.) The mixture was heated to 200 ° C. while stirring with a magnetic bar. At this time, dimethyl sulfone was dissolved and uniformly mixed with the silver nanoparticle solution. As the heating was continued, ethylene glycol, which is a solvent having a low boiling point contained in the silver nanoparticle-containing solution, evaporated. Heating for 1 hour gave a composition of about 25 g of silver nanoparticles, about 25 g of dimethylsulfone and other substances. The composition of the manufactured ink was 45 parts by weight of silver nanoparticles, 3 parts by weight of polyvinylpyrrolidone, and 52 parts by weight of dimethylsulfone out of 100 parts by weight as a whole. This composition solidifies at around 100 ° C. and becomes a solid state at room temperature.

Production Example 2-E2
A dispersion containing silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method was centrifuged to obtain 25 g of a silver paste. The silver paste was mixed with 55 g of sulfolane and then placed in a flask in which nitrogen was passed and heated to 150 ° C. while stirring with a magnetic rod. The composition of the manufactured ink was 32 parts by weight of silver nanoparticles, 2 parts by weight of polyvinylpyrrolidone, and 66 parts by weight of sulfolane out of 100 parts by weight as a whole. This ink composition solidifies near 25 ° C. and is a liquid or soft solid at room temperature.

Production Example 3-E3
A dispersion containing silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method was centrifuged to obtain 25 g of a silver paste. The silver paste was mixed with 55 g of methylphenylsulfone, and then placed in a flask in which nitrogen was passed and heated to 150 ° C. while stirring with a magnetic rod. At this time, since the dispersibility of the silver particles was not good, it could not be used as an ink.

Production Example 4-E4
A dispersion containing silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method was centrifuged to obtain 50 g of a silver paste. The composition of the ink prepared by adding 50 g of a solution in which butyl carbitol is the main solvent component to the silver paste is about 45 parts by weight of silver nanoparticles, 3 parts by weight of polyvinyl pyrrolidone, 100 parts by weight of butyl carbid. It was 52 parts by weight of torr. This composition is in a liquid state at room temperature.

Production Example 5-E5
The dispersion containing silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method was centrifuged to obtain capped silver nanoparticles. Paraffin was added to 50 g of a solution containing butyl carbitol containing 50 wt% of the capped silver nanoparticles as a main solvent component. The composition of the manufactured ink was 25 parts by weight of silver nanoparticles, 2 parts by weight of polyvinylpyrrolidone, 23 parts by weight of butyl carbitol, and 50 parts by weight of paraffin. The paraffin solution is not uniformly mixed with the silver nanoparticle solution, but when the solution is heated to 120 ° C. while stirring with a magnetic rod in a flask in which nitrogen is flown, the solution partially evaporates from the silver nanoparticle-containing solution portion and the silver nanoparticle Precipitated as a mass. Such lumps have been found unsuitable for use in inks because they block the inkjet nozzles.

Production Example 6-E6
In a flask in which nitrogen was passed after mixing 50 g of an ethylene glycol (boiling point 197 ° C.) solution containing 50 wt% of silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method with 25 g of dimethyl sulfone (boiling point 238 ° C.) The mixture was heated to 200 ° C. while stirring with a magnetic bar. At this time, dimethyl sulfone was dissolved and uniformly mixed with the silver nanoparticle solution. As the heating was continued, ethylene glycol, which is a solvent having a low boiling point contained in the silver nanoparticle-containing solution, evaporated. Heating for 1 hour gave a composition of about 25 g of silver nanoparticles, about 27 g of dimethylsulfone and other substances. This composition solidifies at around 100 ° C. and becomes a solid state at room temperature.

  In order to prepare an ink composition having a low melting temperature, 35 g of sulfolane was added to the prepared composition and stirred at 120 ° C. The composition of the manufactured ink was 28 parts by weight of silver nanoparticles, 2 parts by weight of polyvinylpyrrolidone, 30 parts by weight of dimethyl sulfone, and 40 parts by weight of sulfolane out of 100 parts by weight as a whole. The ink composition has a melting temperature of about 65 ° C. and is in a solid state at room temperature.

Production Example 7-E7
A dispersion containing silver nanoparticles capped with polyvinylpyrrolidone synthesized using a polyol synthesis method was centrifuged to obtain 25 g of a silver paste. The above silver paste was mixed with 15 g of dimethyl sulfone and 35 g of sulfolane, and then placed in a flask in which nitrogen was passed and heated to 150 ° C. while stirring with a magnetic rod. The composition of the manufactured ink was 32 parts by weight of silver nanoparticles, 2 parts by weight of polyvinylpyrrolidone, 28 parts by weight of dimethylsulfone, and 38 parts by weight of sulfolane out of 100 parts by weight as a whole. This ink composition solidifies at around 65 ° C. and becomes a solid state at room temperature.

2. Formation of Pattern As described later, a pattern was formed by an inkjet method on a glass substrate, a silicon substrate, a polyethylene terephthalate film (PET film), and inkjet photo paper using the manufactured ink composition. The inkjet equipment used here was Dimatix's DMP2830 (hereinafter “Inkjet Equipment 1”) with a maximum temperature of 70 ° C., and the best of the company ’s approximately 20 products specially made for high temperatures. A printer head of Galaxy 256/30 HM (hereinafter “inkjet equipment 2”) having a temperature of 130 ° C. was used. At this time, the effective nozzle diameter of the inkjet head is 22 μm.

Comparative Example 1
The E1 ink composition of Production Example 1 could not be used for the inkjet equipment 1. However, the pattern could be formed using the inkjet equipment 2. In a state where the temperature of the printer head of the ink jet equipment 2 was maintained at 110 ° C., a metal line pattern was formed by jetting on the glass substrate with a droplet interval of 50 μm. At this time, the line width of the formed line was 82 μm.

Comparative Example 2
The E2 ink composition of Production Example 2 was injected into an ink jet head used for the ink jet equipment 1. In a state where the temperature of the head was maintained at 70 ° C., a metal line pattern was formed by jetting on the glass substrate with a droplet interval of 30 μm. At this time, a phenomenon that the liquid droplet spreads on the glass substrate without being rapidly solidified occurred and the line width of the formed line was 81 μm.

Comparative Example 3
The E4 ink composition of Production Example 4 was injected into the ink jet head used in the ink jet equipment 1. A metal line pattern was formed by jetting with the temperature of the head set to room temperature and a droplet interval of 30 μm on a glass substrate. At this time, a phenomenon that the liquid droplet spreads after falling on the glass substrate occurred, and the line width of the formed line was 85 μm.

Comparative Example 4
The E4 ink composition of Production Example 4 was injected into the ink jet head used in the ink jet equipment 1. A metal line pattern was formed by jetting with the temperature of the head set to room temperature and a droplet interval of 30 μm on an inkjet photo paper. At this time, the phenomenon that the photo paper absorbed the solvent and the line spread was suppressed, and the line width of the formed line was 41 μm.

Example 1
The E6 ink composition of Production Example 6 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. In a state where the temperature of the head was maintained at 70 ° C., a metal line pattern was formed by jetting on the glass substrate with a droplet interval of 30 μm. At this time, the line width of the formed line was 33 μm.

Example 2
The E6 ink composition of Production Example 6 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. With the head temperature maintained at 70 ° C., a metal line pattern was formed by jetting on the silicon substrate with a droplet spacing of 30 μm. At this time, the line width of the formed line was 45 μm.

Example 3
The E6 ink composition of Production Example 6 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. In the state where the head temperature was maintained at 70 ° C., the metal line pattern was formed by jetting onto the inkjet photo paper with the interval between the droplets being 30 μm. At this time, the line width of the formed line was 32 μm.

Example 4
The E6 ink composition of Production Example 6 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. In a state where the head temperature was maintained at 70 ° C., jetting was performed with a droplet interval of 30 μm on a PET film to form a metal line pattern. At this time, the line width of the formed line was 38 μm.

Example 5
The E7 ink composition of Production Example 7 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. In a state where the temperature of the head was maintained at 70 ° C., a metal line pattern was formed by jetting on the glass substrate with a droplet interval of 30 μm. At this time, the line width of the formed line was 34 μm.

Example 6
The E7 ink composition of Production Example 7 was heated to 75 ° C. to be in a liquid state, and then injected into the ink jet head used for the ink jet equipment 1. With the head temperature maintained at 70 ° C., a metal line pattern was formed by jetting on the silicon substrate with a droplet spacing of 30 μm. The line width of the formed line was 44 μm.

  The solvent components of the phase change ink composition according to the above production example, the melting temperature, and the state of the ink composition at room temperature are shown in Table 1 below. In addition, Table 1 shows the line widths of patterns manufactured using the above ink compositions according to Comparative Examples and Examples. On the other hand, the patterns manufactured according to Examples 1 to 6 exhibited a resistance value of about several tens to several hundreds of ohms when measured based on a length of about 30 mm.

  According to the above experimental data, the melting temperature of the ink composition in Comparative Example 1 is not suitable for the ink jet equipment 1, and the melting of the ink composition is performed in Comparative Example 2 when only sulfolane having a melting point of 0 to 40 ° C. is used as a solvent. Since the temperature is less than 60 ° C., it can be seen that the ink composition is not suitable for the present invention. Further, in Comparative Examples 3 and 4, in the case of an ink composition produced using a solvent containing no sulfur-containing compound, a phenomenon that the droplets spread after falling on the glass substrate occurred, and the line was formed according to the substrate. It can be seen that the width changes greatly.

  On the other hand, Production Example 3 shows that an ink composition produced using only methylphenylsulfone having a melting point of 85 ° C. as a solvent is not suitable for an ink composition because the dispersibility of metal nanoparticles is not good. . In addition, in Production Example 5, in the case of an ink composition using polar polyvinylpyrrolidone as a dispersing agent for silver nanoparticles, silver nanoparticles are precipitated as a lump from paraffin, which is a nonpolar solvent, and are not suitable for the ink composition. I understand.

  In addition, in the case of the ink compositions of E6 and E7, since a solvent in which dimethylsulfone is used as the first solvent and sulfolane as the second solvent is used, the temperature suitable for the inkjet equipment 1 is adjusted as a result of adjusting the melting temperature. Melted in Further, as can be seen from Examples 1 to 6, a fine pattern having a relatively constant width corresponding to 1.5 to 2 times the effective nozzle diameter of the ink jet could be formed regardless of the base material.

  Although the embodiment of the present invention has been described in detail above, the scope of the right of the present invention is not limited to this, and various modifications and modifications can be made without departing from the technical idea of the present invention described in the claims. It will be apparent to those skilled in the art that variations are possible.

Claims (10)

Metal nanoparticles,
A dispersant,
A solvent comprising at least two sulfur-containing compounds;
Including
A phase change ink composition having a melting temperature of 60C to 90C. 20 to 70 parts by weight of the metal nanoparticles,
1 to 10 parts by weight of the dispersant,
20 to 79 parts by weight of the solvent,
The phase change ink composition according to claim 1, comprising:   The phase change ink composition according to claim 1, wherein the surface of the metal nanoparticles is capped with the dispersant.   The phase change ink composition according to any one of claims 1 to 3, wherein the sulfur-containing compound is a sulfone group-containing compound.   5. The solvent according to claim 1, wherein the solvent is a mixture of a first solvent having a melting point of 80 ° C. to 200 ° C. and a second solvent having a melting point of 0 to 40 ° C. 6. Phase change ink composition.   The phase change ink composition according to claim 5, wherein the first solvent is dimethyl sulfone and the second solvent is sulfolane.   The phase change ink composition according to claim 5 or 6, wherein a ratio of the first solvent to the second solvent is 1: 0.75 to 1: 1.5.   The metal nanoparticles include at least one selected from the group consisting of gold, silver, copper, nickel, zinc, platinum, tin, chromium, palladium, cobalt, titanium, molybdenum, iron, manganese, tungsten, and aluminum. The phase change ink composition according to any one of claims 1 to 7.   The phase change ink composition according to any one of claims 1 to 8, wherein the viscosity of the phase change ink composition is 1 to 20 cP at a melting temperature of 60 ° C to 90 ° C.   A conductive pattern formed using the phase change ink composition according to any one of claims 1 to 9.