(METH)acrylic resin, vehicle composition, slurry composition, and electronic component

Abstract

The present invention provides a (meth)acrylic resin from which conductive paste having little viscosity variation can be produced. The present invention also provides: a vehicle composition containing the (meth)acrylic resin; a slurry composition containing the vehicle composition; and an electronic component formed using the slurry composition. The present invention is a (meth)acrylic resin having at least one constituent unit from among: a constituent unit that is derived from a monomer A that is a methacrylic acid ester monomer, the monomer A including a repeating unit of propylene oxide and having a weight average molecular weight (Mw) of 600-900 calculated in terms of polystyrene and a molecular weight dispersity of 1.03-1.09; and a constituent unit that is derived from a monomer B that is a methacrylic acid ester monomer, the monomer B including a repeating unit of ethylene oxide and having a weight average molecular weight (Mw) of 1,400-2,100 calculated in terms of polystyrene and a molecular weight dispersity of 1.02-1.07. When the content of constituent units derived from all the monomer components is defined as 100 wt%, the total content of the constituent unit derived from the monomer A and the constituent unit derived from the monomer B is 1-30 wt%.

Description

(Meth)acrylic resin, vehicle composition, slurry composition and electronic components

[0001] The present invention relates to (meth)acrylic resin, vehicle composition, slurry composition, and electronic components.

[0002] Multilayer ceramic capacitors are known to have a structure comprising a laminate in which multiple dielectric layers and internal electrodes are alternately stacked, and a pair of external electrodes provided to sandwich the laminate. The external electrodes are formed by applying an external electrode slurry composition to the surface of the laminate and sintering it.

[0003] In recent years, with the miniaturization of conductive metal particles, the miniaturization of inorganic particles used in external electrodes has also progressed. Miniaturized inorganic particles tend to aggregate in slurry compositions, and when aggregation occurs, voids tend to remain in the degreasing and firing processes, and the dispersibility of the inorganic particles decreases. As a result, when used in electronic components such as multilayer ceramic capacitors, this can cause a decrease in the electrical characteristics of the product.

[0004] Common binder resins used for external electrodes include, for example, (meth)acrylic resins and ethylcellulose. For instance, Patent Document 1 describes a configuration using an organic vehicle that combines alcohols such as terpineol with a (meth)acrylic resin as an organic binder.

[0005] Patent No. 6950833

[0006] In recent years, efforts have been made to improve yield in order to increase the production efficiency of multilayer ceramic capacitors. Among the production processes, the process of applying external electrode paste to the chip is particularly prone to process defects, and in order to improve yield, it is necessary to keep the viscosity of the external electrode paste constant. However, conventional configurations using organic vehicles, such as the one described in Patent Document 1, have the problem of being prone to process defects due to variations in the viscosity of the resulting paste. For this reason, there is a need for a conductive paste with less viscosity variation.

[0007] The present invention aims to provide a (meth)acrylic resin capable of producing conductive pastes with minimal viscosity variation. It also aims to provide a vehicle composition containing the (meth)acrylic resin, a slurry composition containing the vehicle composition, and an electronic component using the slurry composition.

[0008] Disclosure 1 is a (meth)acrylic resin having at least one constituent unit from monomer A, which is a methacrylic acid ester monomer having repeating units of propylene oxide, a weight-average molecular weight (Mw) on a polystyrene basis of 600 to 900, and a molecular weight dispersion of 1.03 to 1.09, and monomer B, which is a methacrylic acid ester monomer having repeating units of ethylene oxide, a weight-average molecular weight (Mw) on a polystyrene basis of 1400 to 2100, and a molecular weight dispersion of 1.02 to 1.07, wherein when the content of constituent units derived from all monomer components is 100% by weight, the total content of constituent units derived from monomer A and constituent units derived from monomer B is 1 to 30% by weight. Disclosure 2 is the (meth)acrylic resin of Disclosure 1, wherein the weight-average molecular weight of the monomer components is 135 or more and 530 or less. Disclosure 3 is the (meth)acrylic resin of Disclosure 1, wherein the weight-average molecular weight of the monomer components is 160 or more and 485 or less. Disclosure 4 is a vehicle composition containing the (meth)acrylic resin of Disclosure 1, 2, or 3 and a vehicle solvent. Disclosure 5 is a slurry composition containing the vehicle composition of Disclosure 4, inorganic particles, and a dispersant. Disclosure 6 is an electronic component using the slurry composition of Disclosure 5. The present invention will be described in detail below.

[0009] The inventors of the present invention have discovered that a conductive paste with less viscosity variation can be produced by using a (meth)acrylic resin containing a predetermined amount of constituent units derived from a specific long-chain methacrylic monomer component as a binder resin, and have completed the present invention.

[0010] The (meth)acrylic resin of the present invention has at least one structural unit from among monomer A, which is a methacrylic acid ester monomer having repeating units of propylene oxide, having a weight-average molecular weight (Mw) of 600 to 900 on a polystyrene basis, and a molecular weight dispersion of 1.03 to 1.09, and monomer B, which is a methacrylic acid ester monomer having repeating units of ethylene oxide, having a weight-average molecular weight (Mw) of 1400 to 2100 on a polystyrene basis, and a molecular weight dispersion of 1.02 to 1.07. The (meth)acrylic resin of the present invention only needs to have at least one of the structural units derived from monomer A and the structural units derived from monomer B, and may have only the structural units derived from monomer A, or only the structural units derived from monomer B. It may also have both the structural units derived from monomer A and the structural units derived from monomer B.

[0011] The above monomer A is a methacrylic acid ester monomer having repeating units of propylene oxide, and specifically, polypropylene glycol methacrylate is an example. Furthermore, the above monomer A may have an alkoxy group at its terminus. Examples of such alkoxy groups include a methoxy group, an ethoxy group, and a butoxy group.

[0012] The weight-average molecular weight (Mw) of monomer A, calculated on a polystyrene basis, is 600 to 900. The Mw is preferably 700 or higher, and preferably 800 or lower. Furthermore, the dispersion (Mw / Mn) of monomer A is 1.03 to 1.09. The dispersion is preferably 1.04 or higher, and preferably 1.07 or lower. Having a constituent unit with the above configuration can suppress variations in the viscosity of the resulting conductive paste. Note that when multiple monomers with different compositions are used as methacrylic acid ester monomers having repeating propylene oxide units for monomer A, Mw and dispersion can be measured by GPC or the like. Specifically, when multiple monomers with different compositions are used, a mixture of monomers is prepared by mixing them in the ratios used, and Mw and dispersion can be measured by GPC measurement using this mixture.

[0013] The monomer B mentioned above is a methacrylic acid ester monomer having repeating units of ethylene oxide, and specifically, polyethylene glycol methacrylate is an example. Furthermore, the monomer B may have an alkoxy group at its terminus. Examples of such alkoxy groups include a methoxy group, an ethoxy group, and a butoxy group.

[0014] The weight-average molecular weight (Mw) of monomer B, calculated on a polystyrene basis, is 1400 to 2100. The Mw is preferably 1600 or higher, and preferably 1900 or lower. The dispersion of monomer B is 1.02 to 1.07. The dispersion is preferably 1.04 or higher, and preferably 1.06 or lower. Having a constituent unit with the above configuration can suppress variations in the viscosity of the resulting conductive paste. When multiple monomers with different compositions are used as methacrylic acid ester monomers having repeating ethylene oxide units, the Mw and dispersion can be measured by GPC or the like. Specifically, when multiple monomers with different compositions are used, a mixture of monomers is prepared by mixing them in the ratios used, and the Mw and dispersion can be measured by GPC using this mixture. The weight-average molecular weight (Mw) and number-average molecular weight (Mn) are average molecular weights calculated on a polystyrene basis using THF as the mobile phase. These can be obtained by performing GPC measurements using, for example, one ACQUITY APC XT 125 column and two ACQUITY APC XT 45 columns linked together (ACQUITY APC XT125-XT45-XT45, manufactured by Waters).

[0015] The Mw and dispersion of monomer A can be controlled, for example, by adjusting the blending ratio of multiple polypropylene glycols with different number-average molecular weights (Mn) for the polypropylene glycol used as a raw material for the methacrylic acid ester monomer. Similarly, the Mw and dispersion of monomer B can be controlled, for example, by adjusting the blending ratio of multiple polyethylene glycols with different number-average molecular weights (Mn) for the polyethylene glycol used as a raw material for the methacrylic acid ester monomer.

[0016] The (meth)acrylic resin of the present invention has a total content of 1 to 30% by weight of constituent units derived from monomer A and monomer B, when the content of constituent units derived from all monomer components is set to 100% by weight. By using a (meth)acrylic resin containing a predetermined amount of constituent units derived from the above specific long-chain methacrylic monomer component as a binder resin, variations in the viscosity of the resulting conductive paste can be suppressed. The above content is preferably 5% by weight or more, more preferably 8% by weight or more, preferably 25% by weight or less, and more preferably 20% by weight or less. The above content can be measured, for example, by thermal decomposition GC-MS.

[0017] When the (meth)acrylic resin of the present invention has both constituent units derived from monomer A and constituent units derived from monomer B, the content ratio (weight ratio) of constituent units derived from monomer A to constituent units derived from monomer B is preferably 1.0 / 2.0 or more, and preferably 2.0 / 1.0 or less.

[0018] The (meth)acrylic resin of the present invention may have constituent units derived from other polyalkylene glycols of (meth)acrylic acid, other than the constituent units derived from monomer A and the constituent units derived from monomer B. Examples of other polyalkylene glycols of (meth)acrylic acid include polyethylene glycol acrylate, polypropylene glycol acrylate, polytetramethylene glycol (meth)acrylic acid, polyethylene glycol methacrylate, polypropylene glycol methacrylate, etc., whose Mw and dispersion are outside the above range.

[0019] The (meth)acrylic resin of the present invention preferably has structural units derived from alkyl (meth)acrylate in addition to structural units derived from monomer A and structural units derived from monomer B. The alkyl (meth)acrylate may have a linear alkyl group or a branched alkyl group.

[0020] The (meth)acrylic resin of the present invention preferably has constituent units derived from an alkyl (meth)acrylate ester having a branched alkyl group. The (meth)acrylic resin containing an alkyl (meth)acrylate ester having a branched alkyl group exhibits excellent decomposition under an inert gas atmosphere.

[0021] As the alkyl (meth)acrylate ester having the branched alkyl group described above, it is preferable that the branched alkyl group has 3 or more carbon atoms, more preferably 4 or more, preferably 20 or fewer, more preferably 15 or fewer, even more preferably 12 or fewer, and even more preferably 10 or fewer.

[0022] Examples of alkyl esters (meth)acrylates having the above-mentioned branched alkyl group include isopropyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isopentyl (meth)acrylate, isohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, and isodecyl (meth)acrylate. Among these, isopropyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isodecyl (meth)acrylate are preferred, isopropyl methacrylate, isobutyl methacrylate, s-butyl methacrylate, 2-ethylhexyl methacrylate, and isodecyl methacrylate are more preferred, and isobutyl methacrylate and 2-ethylhexyl methacrylate are even more preferred. The above-mentioned (meth)acrylic resin preferably has at least one constituent unit selected from the group consisting of constituent units derived from isobutyl methacrylate and constituent units derived from 2-ethylhexyl methacrylate, as a constituent unit derived from the above-mentioned alkyl (meth)acrylate having a branched alkyl group. Having such a configuration can increase the decomposition rate of the (meth)acrylic resin.

[0023] In the (meth)acrylic resin of the present invention, when the content of constituent units derived from all monomer components is taken as 100% by weight, the content of constituent units derived from the branched alkyl group-containing alkyl (meth)acrylate is preferably 10% by weight or more, more preferably 20% by weight or more, preferably 70% by weight or less, and more preferably 60% by weight or less. Within this range, a conductive paste composition with excellent low-temperature decomposition properties can be obtained. The above content can be measured, for example, by thermal decomposition GC-MS.

[0024] The (meth)acrylic resin of the present invention preferably has constituent units derived from an alkyl (meth)acrylate ester having a linear alkyl group. The number of carbon atoms in the linear alkyl group is preferably 1 or more, more preferably 2 or more, preferably 10 or less, and more preferably 6 or less.

[0025] Examples of alkyl (meth)acrylate esters having the linear alkyl group mentioned above include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, n-pentyl (meth)acrylate, and n-hexyl (meth)acrylate. Among these, methyl (meth)acrylate, ethyl (meth)acrylate, and n-butyl (meth)acrylate are preferred, and ethyl methacrylate and n-butyl methacrylate are more preferred.

[0026] In the (meth)acrylic resin of the present invention, when the content of constituent units derived from all monomer components is taken as 100% by weight, the content of constituent units derived from the alkyl (meth)acrylate having the linear alkyl group is preferably 10% by weight or more, more preferably 20% by weight or more, preferably 80% by weight or less, and more preferably 70% by weight or less. By setting the content within the above range, handling properties such as printability are improved. The above content can be measured, for example, by thermal decomposition GC-MS.

[0027] The (meth)acrylic resin of the present invention may further have constituent units derived from (meth)acrylic acid esters in which the ester substituent has a cyclic structure. Examples of (meth)acrylic acid esters in which the ester substituent has a cyclic structure include alkyl (meth)acrylic acid esters having a cyclic alkyl group such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate, glycidyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, and (meth)acrylic acid esters having a glycidyl group such as 3,4-epoxycyclohexylmethyl (meth)acrylate.

[0028] In the (meth)acrylic resin of the present invention, when the content of constituent units derived from all monomer components is taken as 100% by weight, the content of constituent units derived from the alkyl (meth)acrylate is preferably 70% by weight or more, more preferably 75% by weight or more, preferably 99% by weight or less, and more preferably 92% by weight or less.

[0029] In the (meth)acrylic resin of the present invention, from the viewpoint of further suppressing viscosity variations, the weighted average molecular weight of the monomer components is preferably 135 or more, more preferably 160 or more, preferably 530 or less, and more preferably 485 or less. The above weighted average molecular weight can be determined by summing the results of multiplying the molecular weight of each monomer component by the proportion of each monomer component in the total monomer components (weight % / 100).

[0030] The weight-average molecular weight (Mw) of the (meth)acrylic resin of the present invention is preferably 20,000 or more, and preferably 4,000,000 or less. When the Mw is 20,000 or more, the viscosity of the slurry composition does not become too low, and the dispersibility of inorganic particles can be improved. When the Mw is 4,000,000 or less, the strength of the coating film can be increased, and the viscosity of the slurry composition becomes sufficiently high, improving storage stability and printability. When the Mw is 30,000 or more, more preferably 50,000 or more, preferably 3,500,000 or less, more preferably 3,000,000 or less, even more preferably 2,000,000 or less, and even more preferably 1,000,000 or less.

[0031] The ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of the (meth)acrylic resin of the present invention (Mw / Mn) is usually 1.0 or higher, preferably 1.5 or higher, more preferably 2.0 or higher, preferably 10.0 or lower, more preferably 8.0 or lower, and even more preferably 6.0 or lower. By keeping it within the above range, a suitable amount of low-molecular-weight components are included, resulting in a suitable viscosity for the slurry composition and increased productivity. The weight-average molecular weight (Mw) and number-average molecular weight (Mn) are average molecular weights calculated on a polystyrene basis and can be obtained by GPC measurement using, for example, column LF-804 (manufactured by Showa Denko Corporation).

[0032] The glass transition temperature (Tg) of the (meth)acrylic resin of the present invention is preferably 20°C or higher, more preferably 30°C or higher, even more preferably 40°C or higher, preferably 80°C or lower, more preferably 70°C or lower, even more preferably 60°C or lower, and even more preferably 50°C or lower. The above glass transition temperature (Tg) can be measured, for example, using a differential scanning calorimeter (DSC).

[0033] When the (meth)acrylic resin of the present invention is in the form of particles, the average particle diameter of the resin particles is preferably 0.1 μm or more, more preferably 0.2 μm or more, even more preferably 0.3 μm or more, preferably 1.0 μm or less, more preferably 0.9 μm or less, and even more preferably 0.8 μm or less, from the viewpoint of solubility. The above average particle diameter can be determined, for example, by measuring the volume-average particle diameter using a laser diffraction / scattering particle size distribution analyzer.

[0034] The CV value of the particle size of the (meth)acrylic resin particles is preferably 15% or less, more preferably 12% or less, even more preferably 10% or less, and even more preferably 8% or less. By setting the CV value within this range, the solubility of the (meth)acrylic resin can be further improved. Improved solubility increases productivity, and the reduction in undissolved resin improves tensile performance. The lower limit is not particularly limited and is, for example, 0%. The above CV value can be calculated from the average value and standard deviation of the particle size of 100 particles by observing the (meth)acrylic resin particles using a scanning electron microscope. The above CV value tends to be smaller when persulfates such as ammonium persulfate or potassium persulfate are used.

[0035] The method for producing the (meth)acrylic resin of the present invention is not particularly limited. For example, multiple polyethylene glycols or polypropylene glycols with different number-average molecular weights (Mn) can be mixed with methacrylic anhydride or the like to produce monomers A and B having a weight-average molecular weight (Mw) and dispersion within a predetermined range. Next, a dispersion medium such as water is added to the raw material monomer mixture containing the obtained monomers A and B, and other alkyl (meth)acrylate esters, to prepare a monomer mixture. Further, a polymerization initiator is added to the obtained monomer mixture to polymerize and produce the (meth)acrylic resin. Alternatively, a chain transfer agent may be added to the monomer mixture. The polymerization method is not particularly limited and includes emulsion polymerization, suspension polymerization, bulk polymerization, interfacial polymerization, solution polymerization, etc. Among these, solution polymerization is preferred.

[0036] In addition to water, organic solvents can also be used as the dispersion medium. Examples of organic solvents include toluene, ethyl acetate, butyl acetate, pentyl acetate, hexyl acetate, ethyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate, isopropanol, methyl isobutyl ketone, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol ethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, trimethylpentanediol monoisobutyrate, butyl carbitol, butyl carbitol acetate, terpineol, terpineol acetate, dihydroterpineol, dihydroterpineol acetate, texanol, isophorone, butyl lactate, dioctyl phthalate, dioctyl adipate, benzyl alcohol, phenylpropylene glycol, and cresol. Among these, butyl acetate, terpineol, terpineol acetate, dihydroterpineol, dihydroterpineol acetate, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, butyl carbitol, butyl carbitol acetate, and texanol are preferred. Furthermore, butyl acetate, terpineol, terpineol acetate, dihydroterpineol, and dihydroterpineol acetate are more preferred. These organic solvents may be used individually or in combination of two or more.

[0037] Examples of polymerization initiators include lauroyl peroxide, dilauryl peroxide, p-menthane hydroperoxide, diisopropylbenzene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydroxyperoxide, t-butyl hydroxyperoxide, cyclohexanone peroxide, disuccinate peroxide, potassium persulfate, and ammonium persulfate. Examples of commercially available products include Permenta H, Permil P, Perocta H, Permil H-80, Perloyl 355, Perbutyl H-69, Perhexa H, Perloyl SA, Perloyl L (all manufactured by NOF Corporation), Trigonox 27, and Trigonox 421 (both manufactured by Nouryon).

[0038] Examples of the above-mentioned chain transfer agents include 1-decanethiol, butanethiol, octanthiol, dodecanethiol, hexadecanethiol, octadecanethiol, cyclohexyl mercaptan, thiophenol, octyl thioglycolate, octyl 2-mercaptopropionate, octyl 3-mercaptopropionate, 2-ethylhexyl mercaptopropionate, 2-ethylhexyl thioglycolate, butyl-3-mercaptopropionate, methyl-3-mercaptopropionate, 2,2-(ethylenedioxy)diethanethiol, ethanethiol, and 4-methylbenzene. Examples of thiols include thiols, 2-mercaptoethyl octanoate, 1,8-dimercapto-3,6-dioxaoctane, decantrithiol, dodecyl mercaptan, diphenyl sulfoxide, dibenzyl sulfide, 2,3-dimethylcapto-1-propanol, mercaptoethanol, thiosalicylic acid, thioglycerol, thioglycolic acid, 3-mercaptopropionic acid, thiomalic acid, mercaptoacetic acid, mercaptosuccinic acid, 2-mercaptoethanesulfonic acid, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, and other thiol compounds.

[0039] The polymerization temperature is preferably 50°C or higher, more preferably 60°C or higher, preferably 90°C or lower, and more preferably 80°C or lower.

[0040] A vehicle composition can be prepared using the (meth)acrylic resin and vehicle solvent of the present invention. A vehicle composition containing the (meth)acrylic resin and vehicle solvent of the present invention is also one of the present inventions.

[0041] The above vehicle composition contains a vehicle solvent. An organic solvent can be used as the vehicle solvent. Examples of the organic solvent include aliphatic alcohols, glycols, terpene organic solvents, aromatic alcohols, aromatic hydrocarbons, esters, ketones, N-methylpyrrolidone, and the like. Examples of aliphatic alcohols include ethanol, propanol, isopropanol, heptanol, octanol, decanol, tridecanol, lauryl alcohol, tetradecyl alcohol, cetyl alcohol, 2-ethyl-1-hexanol, octadecyl alcohol, hexadecenol, oleyl alcohol, texanol, 2-butyl-2-ethyl-1,3-propanediol, neopentyl glycol, and the like. Examples of glycols include ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, butyl carbitol, ethylene glycol monoethyl ether acetate, trimethylpentanediol monoisobutyrate, butyl carbitol acetate, texanol, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, and ethylene glycol ethyl ether. Examples of terpene-based organic solvents include terpineol, dihydroterpineol, terpineol acetate, dihydroterpineol acetate, dihydroterpineol oxyethanol, terpinyl methyl ether, dihydroterpineol methyl ether, α-pinene, β-pinene, camphene, Δ-2-carene, Δ-3-carene, limonene, terpinene, and terpinolene. Examples of aromatic alcohols include benzyl alcohol. Examples of aromatic hydrocarbons include toluene. Examples of the above esters include methyl acetate, ethyl acetate, butyl acetate, hexyl acetate, dodecyl acetate, isoamyl acetate, butyl butyrate, butyl lactate, dioctyl phthalate, and dioctyl adipate. Examples of the above ketones include methyl isobutyl ketone, methyl ethyl ketone, methyl isobutyl ketone, and isophorone.The above organic solvent preferably contains at least one selected from the group consisting of terpineol, terpineol acetate, dihydroterpineol and dihydroterpineol acetate, butyl carbitol, and butyl carbitol acetate.

[0042] The total content of terpineol, terpineol acetate, dihydroterpineol, dihydroterpineol acetate, butyl carbitol, and butyl carbitol acetate in the above vehicle solvent is preferably 90% by weight or more, more preferably 93% by weight or more, even more preferably 96.5% by weight or more, even more preferably 98% by weight or more, preferably 100% by weight or less, more preferably 99.9% by weight or less, and even more preferably 99.5% by weight or less. By setting the content within the above range, a vehicle composition can be made that produces a conductive paste with little viscosity change due to temperature and little viscosity variation.

[0043] The content of the vehicle solvent in the above vehicle composition is preferably 50% by weight or more, more preferably 60% by weight or more, even more preferably 70% by weight or more, preferably 95% by weight or less, and more preferably 90% by weight or less, from the viewpoint of coating properties and dispersibility of inorganic particles.

[0044] Furthermore, in the above vehicle composition, the content of the vehicle solvent per 100 parts by weight of the (meth)acrylic resin is preferably 150 parts by weight or more, more preferably 230 parts by weight or more, preferably 1900 parts by weight or less, and more preferably 900 parts by weight or less.

[0045] The above vehicle composition may contain, in addition to the (meth)acrylic resin and the above vehicle solvent, a dispersant, a thixotropic agent, etc.

[0046] The method for preparing the above vehicle composition is not particularly limited. For example, one method is to mix the (meth)acrylic resin of the present invention with the above vehicle solvent.

[0047] A slurry composition can be prepared by adding inorganic particles, a dispersant, and other components added as necessary to the above vehicle composition. A slurry composition containing the above vehicle composition, inorganic particles, and a dispersant is also one of the present inventions.

[0048] In the above slurry composition, the content of the (meth)acrylic resin of the present invention is preferably 3% by weight or more, more preferably 4% by weight or more, preferably 10% by weight or less, and more preferably 8% by weight or less.

[0049] In the above slurry composition, the content of the above vehicle solvent is preferably 20% by weight or more, more preferably 24% by weight or more, preferably 50% by weight or less, and more preferably 40% by weight or less.

[0050] The above slurry composition contains inorganic particles. The inorganic particles are not particularly limited, and examples thereof include ceramic powder, glass powder, phosphor particles, silicon oxide, and metal particles.

[0051] The above ceramic powder is not particularly limited, and examples thereof include alumina, ferrite, zirconia, zircon, barium zirconate, calcium zirconate, titanium oxide, barium titanate, strontium titanate, calcium titanate, magnesium titanate, zinc titanate, lanthanum titanate, neodymium titanate, lead zirconate titanate, aluminum nitride, silicon nitride, boron nitride, boron carbide, barium stannate, calcium stannate, magnesium silicate, mullite, steatite, cordierite, forsterite, etc. Also, ITO, FTO, niobium oxide, vanadium oxide, tungsten oxide, lanthanum strontium manganite, lanthanum strontium cobalt ferrite, yttrium-stabilized zirconia, gadolinium-doped ceria, nickel oxide, lanthanum chromite, Sm ２ Fe １７ N ３ 、Nd ２ Fe １４ B、MnAlC、L １０ FeNi、La ２／３－ｘ Li ３ｘ TiO ３ 、La （１－ｘ）／３ Li ｘNboO ３ LaGaO ３ LaScO ３ CaZrO ３ , (La ０．８７５ Sr ０．１２５ ) MnO ３ , PbZrTiO ３ , SrBi ２ Ta ２ O ９ BiFeO ３ KNbO ３ PbVO ３ BiCo ３ , Bi(Zn １／２ Ti １／２ ) ３ Other options can also be used.

[0052] The above glass powder is not particularly limited and may include, for example, glass powders such as bismuth oxide glass, silicate glass, lead glass, zinc glass, boron glass, or CaO-Al ２ O ３ -SiO ２ system, MgO-Al ２ O ３ -SiO ２ system, LiO ２ - Al ２ O ３ -SiO ２ Examples include glass powders of various silicon oxides such as the SnO-B system. ２ O ３ -P ２ O ５ - Al ２ O ３ mixture, PbO-B ２ O ３ -SiO ２ Mixture, BaO-ZnO-B ２ O ３ -SiO ２ Mixture, ZnO-Bi ２ O ３ -B ２ O ３ -SiO ２ mixture, Bi ２ O ３ -B ２ O ３ -BaO-CuO mixture, Bi ２ O３ -ZnO-B ２ O ３ -Al ２ O ３ -SrO mixture, ZnO-Bi ２ O ３ -B ２ O ３ Mixture, Bi ２ O ３ -SiO ２ Mixture, P ２ O ５ -Na ２ O-CaO-BaO-Al ２ O ３ -B ２ O ３ Mixture, P ２ O ５ -SnO mixture, P ２ O ５ -SnO-B ２ O ３ Mixture, P ２ O ５ -SnO-SiO ２ Mixture, CuO-P ２ O ５ -RO mixture, SiO ２ -B ２ O ３ -ZnO-Na ２ O-Li ２ O-NaF-V ２ O ５ Mixture, P ２ O ５ -ZnO-SnO-R ２ O-RO mixture, B ２ O ３ -SiO ２ -ZnO mixture, B ２ O ３ -SiO ２ -Al ２ O ３ -ZrO ２ Mixture, SiO ２ -B ２ O ３ -ZnO-R ２ O-RO mixture, SiO ２ -B ２ O ３ -Al ２ O ３ -RO-R ２O mixture, SrO-ZnO-P ２ O ５ Mixture, BaO-ZnO-B ２ O ３ -SiO ２ Glass powders such as mixtures can also be used. R is an element selected from the group consisting of Zn, Ba, Ca, Mg, Sr, Sn, Ni, Fe, and Mn. In particular, PbO-B ２ O ３ -SiO ２ Mixture of glass powder, and lead-free BaO-ZnO-B ２ O ３ -SiO ２ mixture or ZnO-Bi ２ O ３ -B ２ O ３ -SiO ２ Lead-free glass powders such as mixtures are preferred.

[0053] The above-mentioned phosphor particles are not particularly limited, and for example, as phosphor materials, conventionally known phosphor materials for displays, such as blue phosphor materials, red phosphor materials, and green phosphor materials, can be used. As a blue phosphor material, for example, MgAl １０ O １７ : EU system, Y ２ SiO ５ : Ce system, CaWO ４ : Pb-based, BaMgAl １４ O ２３ :Eu-based, BaMgAl １６ O ２７ : EU system, BaMg ２ Al １４ O ２３ : EU system, BaMg ２ Al １４ O ２７ Eu-based and ZnS-(Ag,Cd)-based materials are used. For example, Y ２ O ３ : EU system, Y ２ SiO ５ : EU system, Y ３ Al ５ O １２ EU-based, Zn ３ (PO ４ ) ２: Mn system, YBO ３ :Eu-based, (Y,Gd)BO ３ EU-based, GdBO ３ EU-based, ScBO ３ EU system, LuBO ３ EU-based materials are used. For example, Zn is used as a green phosphor material. ２ SiO ４ : Mn system, BaAl １２ O １９ :Mn-based, SrAl １３ O １９ : Mn-based, CaAl １２ O １９ : Mn system, YBO ３ :Tb series, BaMgAl １４ O ２３ : Mn system, LuBO ３ :Tb series, GdBO ３ :Tb series, ScBO ３ : Tb system, Sr ６ Si ３ O ３ Cl ４ Eu-based materials are used. Others include ZnO: Zn-based, ZnS: (Cu,Al)-based, ZnS: Ag-based, Y ２ O ２ S: Eu-based, ZnS: Zn-based, (Y, Cd)BO ３ :Eu-based, BaMgAl １２ O ２３ EU-based products can also be used.

[0054] The above-mentioned metal particles are not particularly limited and include, for example, powders made of copper, nickel, palladium, platinum, gold, silver, aluminum, tungsten, and alloys thereof. Metals such as copper and iron, which have good adsorption properties with carboxyl groups, amino groups, amide groups, etc., and are easily oxidized, can also be suitably used. These metal powders may be used individually or in combination of two or more. In addition to metal complexes, various carbon blacks, carbon nanotubes, etc., may also be used.

[0055] Other inorganic particles include Li ２ S-M ｘ S ｙ Lithium sulfur-based glass such as (M=B, Si, Ge, P), LiCeO２ Lithium cobalt composite oxides such as LiMnO ４ Lithium manganese composite oxides, lithium nickel composite oxides, lithium vanadium composite oxides, lithium zirconium composite oxides, lithium hafnium composite oxides, lithium silicate (Li ３．５ Si ０．５ P ０．５ O ４ ), Lithium Titanium Phosphate (LiTi ２ (PO ４ ) ３ ), lithium titanate (Li ４ Ti ５ O １２ ), Li ４／３ Ti ５／３ O ４ LiCoO ２ Lithium germanium phosphate (LiGe ２ (PO ４ ) ３ ), Li ２ - SiS glass, Li ４ GeS ４ -Li ３ PS ４ Glass system, LiSiO ３ LiMn ２ O ４ Li ２ S-P ２ S ５ Glass and ceramics, Li ２ O-SiO ２ Li ２ O-V ２ O ５ -SiO ２ LiS-SiS ２ -Li ４ SiO ４ Glass systems, ion-conducting oxides such as LiPON, Li ２ O-P ２ O ５ -B ２ O ３ Li ２ O-GeO ２ Lithium oxide compounds such as Ba, Li ｘ Al ｙ Ti ｚ (PO ４ ) ３Glass system, La ｘ Li ｙ TiO ｚ Glass system, Li ｘ Ge ｙ P ｚ O ４ Glass system, Li ７ La ３ Zr ２ O １２ Glass system, Li ｖ Si ｗ P ｘ S ｙ Cl ｚ Glass or similar materials can also be used.

[0056] The average particle diameter of the inorganic particles is preferably 0.01 μm or more, more preferably 0.05 μm or more, even more preferably 0.1 μm or more, preferably 50 μm or less, more preferably 30 μm or less, even more preferably 10 μm or less, even more preferably 5 μm or less, particularly preferably 3 μm or less, and most preferably 1 μm or less. The average particle diameter can be determined, for example, by measuring the volume-average particle diameter using a laser diffraction / scattering particle size distribution analyzer.

[0057] The content of the inorganic particles in the slurry composition is preferably 10% by weight or more, more preferably 20% by weight or more, even more preferably 30% by weight or more, even more preferably 40% by weight or more, preferably 90% by weight or less, more preferably 80% by weight or less, even more preferably 70% by weight or less, and even more preferably 65% ​​by weight or less. Within this range, the slurry composition can have sufficient viscosity and excellent coating properties, and the inorganic particles can have excellent dispersibility.

[0058] The above slurry composition contains a dispersant. Suitable dispersants include, for example, fatty acids, aliphatic amines, alkanolamides, and phosphate esters. Silane coupling agents may also be included. The fatty acids are not particularly limited and include, for example, saturated fatty acids such as behenic acid, stearic acid, palmitic acid, myristic acid, lauric acid, capric acid, caprylic acid, and coconut fatty acid; and unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid, sorbic acid, beef tallow fatty acid, and castor hydrogenated fatty acid. Among these, lauric acid, stearic acid, and oleic acid are particularly preferred. The aliphatic amines are not particularly limited and include, for example, laurylamine, myristylamine, cetylamine, stearylamine, oleylamine, alkyl (coconut)amine, alkyl (hydrogenated beef tallow)amine, alkyl (beef tallow)amine, and alkyl (soybean)amine. The above alkanolamides are not particularly limited and include, for example, coconut fatty acid diethanolamide, beef tallow fatty acid diethanolamide, lauric acid diethanolamide, oleic acid diethanolamide, etc. The above phosphate esters are not particularly limited and include, for example, polyoxyethylene alkyl ether phosphate esters and polyoxyethylene alkyl allyl ether phosphate esters.

[0059] The content of the dispersant in the slurry composition is preferably 0.1% by weight or more, more preferably 0.15% by weight or more, preferably 1% by weight or less, and preferably 0.5% by weight or less.

[0060] The above slurry composition may further contain additives such as plasticizers and surfactants. Examples of the above plasticizers include di(butoxyethyl) adipate, dibutoxyethoxyethyl adipate, triethylene glycol dibutyl, triethylene glycol bis(2-ethylhexanoate), triethylene glycol dihexanoate, triethyl acetyl citrate, tributyl acetyl citrate, diethyl acetyl citrate, dibutyl acetyl citrate, dibutyl sebacate, triacetin, diethyl acetyloxymalonate, and diethyl ethoxymalonate.

[0061] The above-mentioned surfactant is not particularly limited and includes, for example, cationic surfactants, anionic surfactants, and nonionic surfactants. The above-mentioned nonionic surfactant is not particularly limited, but it is preferable that it is a nonionic surfactant with an HLB value of 10 or more and 20 or less. Here, the HLB value is used as an indicator of the hydrophilicity and lipophilicity of a surfactant, and several calculation methods have been proposed. For example, for ester-based surfactants, the saponification value is S, the acid value of the fatty acid constituting the surfactant is A, and the HLB value is defined as 20 (1-S / A). Specifically, nonionic surfactants having polyethylene oxide obtained by adding alkylene ether to a fatty acid chain are preferred, and specifically, for example, polyoxyethylene lauryl ether and polyoxyethylene cetyl ether are preferably used. Although the above-mentioned nonionic surfactant has good thermal decomposition properties, adding a large amount may reduce the thermal decomposition properties of the slurry composition, so the preferred upper limit of the content is 5% by weight.

[0062] The method for preparing the above-mentioned slurry composition is not particularly limited, and conventionally known stirring methods can be used. Specifically, for example, a method of stirring the above-mentioned vehicle composition, the above-mentioned inorganic particles, the above-mentioned dispersant, and other components such as additional solvents and plasticizers added as needed, using a three-roll mixer or the like. The order in which the components of the slurry composition are added can be set as appropriate.

[0063] Electronic components can be manufactured using the above-mentioned slurry composition. Electronic components made using the above-mentioned slurry composition are also one of the present invention. Examples of the above-mentioned electronic components include die attach paste (ACP), die attach film (ACF), TSV, via electrodes for TGV, touch panels, various circuits for RFID and sensor substrates, various die bonding agents, encapsulants for MEMS devices, electrode materials for solar cells, multilayer ceramic capacitors, LTCC, silicon capacitors, and all-solid-state batteries. In addition to the above-mentioned electrode circuit applications, it can also be used for antibacterial materials, electromagnetic shielding, catalysts, fluorescent materials, etc.

[0064] For example, an inorganic particle dispersion molded product can be manufactured by coating the slurry composition onto a support film that has been treated with a single-sided release agent, drying the organic solvent, and then molding it. The shape of the inorganic particle dispersion molded product is not particularly limited, but it can be in the shape of a sheet, for example.

[0065] Examples of methods for producing the above-mentioned inorganic particle dispersion molded product include a method of uniformly forming a coating film on a support film using a coating method such as a roll coater, die coater, squeeze coater, or curtain coater with the slurry composition.

[0066] For example, if the inorganic particle dispersion molded product is in the form of a sheet, the support film used in manufacturing the inorganic particle dispersion molded product is preferably a resin film that is heat-resistant, solvent-resistant, and flexible. The flexibility of the support film allows the slurry composition to be applied to the surface of the support film using a roll coater, blade coater, etc., and the resulting inorganic particle dispersion sheet-forming film can be stored and supplied in a rolled state.

[0067] Examples of resins used to form the support film include polyethylene terephthalate resin, polyester resin, polyethylene resin, polypropylene resin, polystyrene resin, polyimide resin, polyvinyl alcohol resin, polyvinyl chloride resin, fluororesins such as polyfluoroethylene, nylon, and cellulose resin. The thickness of the support film is preferably 20 to 100 μm. Furthermore, it is preferable that the surface of the support film be treated with a release agent, which facilitates the peeling operation of the support film during the transfer process.

[0068] An inorganic particle dispersion molded product can be manufactured by coating and drying the above slurry composition. Furthermore, by using the above slurry composition and the inorganic particle dispersion molded product as a conductive paste for external electrodes, a multilayer ceramic capacitor, which is an electronic component, can be manufactured.

[0069] A method for manufacturing the above-mentioned multilayer ceramic capacitor includes the steps of printing a conductive paste onto the inorganic particle dispersion molded product, drying it to produce a dielectric sheet, and laminating the dielectric sheets.

[0070] The conductive paste described above contains conductive powder. The material of the conductive powder is not particularly limited as long as it is a conductive material, and examples include nickel, palladium, platinum, gold, silver, copper, molybdenum, tin, and alloys thereof. These conductive powders may be used individually or in combination of two or more types.

[0071] The method for printing the conductive paste described above is not particularly limited and includes, for example, screen printing, die-coating, offset printing, gravure printing, and inkjet printing.

[0072] In the above-described method for manufacturing multilayer ceramic capacitors, a raw ceramic laminate is produced by stacking dielectric sheets printed with the conductive paste, and then subjected to a firing process in a reducing atmosphere at a temperature of 1000 to 1500°C, thereby obtaining a large number of component bases.

[0073] Next, a conductive paste for external electrodes containing the (meth)acrylic resin is applied to both end faces of each component body by immersion. Then, after drying at 100 to 200°C, it is fired at 450 to 800°C in a reducing atmosphere to form external electrodes on both ends of the component body.

[0074] Next, electroplating is applied to the external electrodes to sequentially form Cu, Ni, and Sn films on the external electrodes, thereby obtaining a multilayer ceramic capacitor.

[0075] According to the present invention, it is possible to provide a (meth)acrylic resin capable of producing a conductive paste with minimal viscosity variation. Furthermore, it is possible to provide a vehicle composition containing the (meth)acrylic resin, a slurry composition containing the vehicle composition, and an electronic component using the slurry composition.

[0076] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0077] (Synthesis Examples 1-10) (Preparation of Polyethylene Glycol Methacrylate) A 2 L separable flask equipped with a stirrer, Liebig condenser, vacuum recovery device, thermometer, oil bath, and nitrogen gas inlet was prepared. 154 parts by weight of methacrylic anhydride and 700 parts by weight of polyethylene glycol in the proportions shown in Table 1 were mixed in the 2 L separable flask to prepare a mixture. The mixture was heated to 90°C under reduced pressure of -0.6 MPa while stirring for 3 hours. After 3 hours, the mixture temperature was raised to 120°C to remove unreacted methacrylic anhydride and water, thereby obtaining polyethylene glycol monomer (polyethylene glycol methacrylate). The obtained monomer was prepared as a 2000 ppm THF solution, and the weight-average molecular weight (Mw) and dispersion (Mw / Mn) in polystyrene equivalent were determined by gel permeation chromatography under the following conditions. Apparatus: ACQUITY APC Column: ACQUITY APC XT125-XT45-XT45 4.6 mm × 150 mm × 3 Flow rate: 0.3 mL / min Column temperature: 40°C Injection volume: 10 μL Detector: RI Mobile phase: THF Standard sample: Polystyrene standard The results are shown in Table 1. The following polyethylene glycol was used. Polyethylene glycol 400: Number average molecular weight (Mn) 400, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Polyethylene glycol 600: Number average molecular weight (Mn) 600, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Polyethylene glycol 1000: Number average molecular weight (Mn) 1000, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Polyethylene glycol 1540: Number average molecular weight (Mn) 1540, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Polyethylene glycol 2000: Number average molecular weight (Mn) 2000, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0078]

[0079] (Synthesis Examples 11-20) Polypropylene glycol monomer (polypropylene glycol methacrylate) was obtained in the same manner as in Synthesis Example 1, except that polypropylene glycol was used in the proportions shown in Table 2 instead of polyethylene glycol. Mw and dispersion were determined in the same manner as in Synthesis Example 1. The results are shown in Table 2. The following polypropylene glycols were used: Sannix PP-200: Number average molecular weight (Mn) 200, manufactured by Sanyo Chemical Industries, Ltd. Poly(propylene glycol) average Mn ~425: Number average molecular weight (Mn) 425, manufactured by Sigma-Aldrich Poly(propylene glycol) average Mn ~725: Number average molecular weight (Mn) 725, manufactured by Sigma-Aldrich Poly(propylene glycol) average Mn ~1000: Number average molecular weight (Mn) 1000, manufactured by Sigma-Aldrich

[0080]

[0081] (Examples 1-27, Comparative Examples 1-12) (Preparation of Resin Particles) Pure water was added to a stirring vessel in the amounts shown in Tables 3 and 4 as a dispersion medium, and then monomers, chain transfer agents, and polymerization initiators were added as shown in Tables 3 and 4. In addition to the monomers obtained in Synthesis Examples 1-20, the following monomers, chain transfer agents, and polymerization initiators were used. <Monomers> Methyl methacrylate (MMA): Manufactured by Tokyo Chemical Industry Co., Ltd. n-Butyl methacrylate (BMA): Manufactured by Tokyo Chemical Industry Co., Ltd. Isobutyl methacrylate (iBMA): Manufactured by Tokyo Chemical Industry Co., Ltd. Methyl acrylate (MA): Manufactured by Tokyo Chemical Industry Co., Ltd. Tetracosyl methacrylate (TCMA): Manufactured by Angene International Limited <Chain Transfer Agent> 1-Decanthiol: Manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Polymerization Initiator> Lauroyl peroxide: Manufactured by Thermo Scientific

[0082] Next, the mixture was mixed for 3 minutes at a rotation speed of 10,000 rpm using a comb-type high-speed rotary emulsifier. Then, it was transferred to a reaction vessel equipped with a stirrer and jacket, and nitrogen gas was supplied while stirring at 150 rpm to create a nitrogen atmosphere to prepare the monomer composition. Next, the temperature was raised to 70°C using the jacket to start aqueous suspension polymerization. Three hours after the start of polymerization, the temperature was raised to 80°C, and aqueous suspension polymerization was carried out for a further hour to complete the aqueous suspension polymerization and obtain a suspension containing resin particles.

[0083] (Washing and drying of resin particles) Next, the suspension containing the obtained resin particles was filtered through a Nutsche filter, washed with 1000 parts by weight of deionized water per 100 parts by weight of the resin particles, and dried to obtain resin particles. The weight-average molecular weight (Mw) and number-average molecular weight (Mn) of the obtained (meth)acrylic resin particles were measured by gel permeation chromatography using an LF-804 column (manufactured by SHOKO Co., Ltd.) in polystyrene equivalent, and the molecular weight distribution (Mw / Mn) was determined. Furthermore, the obtained (meth)acrylic resin was measured by pyrolysis GC-MS using a JEOL JMS-Q1500GC instrument, and it was confirmed that the component content was equivalent to the monomer ratio.

[0084]

[0085]

[0086] (Preparation of Vehicle Composition) To 4.6 parts by weight of the obtained resin particles, 23.8 parts by weight of butyl carbitol (diethylene glycol monobutyl ether manufactured by Tokyo Chemical Industry Co., Ltd.) was added as a vehicle solvent and mixed to prepare a vehicle composition.

[0087] (Preparation of Slurry Composition) To 28.4 parts by weight of the obtained vehicle composition, 0.2 parts by weight of a dispersant (Sunopco, Nopco Spers 092), 70.2 parts by weight of silver powder (Fujifilm Wako Pure Chemical Industries, average particle size 45 μm), and 1.2 parts by weight of glass frit (AGC, average particle size 0.8 μm) were added and mixed to prepare a slurry composition (conductive paste).

[0088] <Evaluation> The obtained slurry compositions were evaluated as follows. The results are shown in Tables 5 and 6.

[0089] (Viscosity Variation) Ten slurry compositions were prepared for each example and comparative example using the same method. For each sample, the viscosity at 25°C was measured using an E-type viscometer, and the coefficient of variation of viscosity (CV value %), i.e., viscosity standard deviation ÷ mean viscosity × 100, was evaluated as viscosity variation. A smaller coefficient of variation indicates smaller viscosity variation.

[0090]

[0091]

[0092] According to the present invention, it is possible to provide a (meth)acrylic resin capable of producing a conductive paste with minimal viscosity variation. Furthermore, it is possible to provide a vehicle composition containing the (meth)acrylic resin, a slurry composition containing the vehicle composition, and an electronic component using the slurry composition.

Claims

1. A (meth)acrylic resin having at least one constituent unit from monomer A, which is a methacrylic acid ester monomer having repeating units of propylene oxide, having a weight-average molecular weight (Mw) of 600 to 900 on a polystyrene basis, and a molecular weight dispersion of 1.03 to 1.09; and monomer B, which is a methacrylic acid ester monomer having repeating units of ethylene oxide, having a weight-average molecular weight (Mw) of 1400 to 2100 on a polystyrene basis, and a molecular weight dispersion of 1.02 to 1.07, wherein when the content of constituent units derived from all monomer components is 100% by weight, the total content of constituent units derived from monomer A and constituent units derived from monomer B is 1 to 30% by weight.

2. The (meth)acrylic resin according to claim 1, wherein the weighted average molecular weight of the monomer component is 135 or more and 530 or less.

3. The (meth)acrylic resin according to claim 1, wherein the weighted average molecular weight of the monomer component is 160 or more and 485 or less.

4. A vehicle composition comprising the (meth)acrylic resin and a vehicle solvent according to claim 1, 2, or 3.

5. A slurry composition comprising the vehicle composition according to claim 4, inorganic particles, and a dispersant.

6. An electronic component comprising the slurry composition described in claim 5.

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