WO2017150438A1 - 導電性ペースト、電子部品及び積層セラミックコンデンサ - Google Patents
導電性ペースト、電子部品及び積層セラミックコンデンサ Download PDFInfo
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- WO2017150438A1 WO2017150438A1 PCT/JP2017/007447 JP2017007447W WO2017150438A1 WO 2017150438 A1 WO2017150438 A1 WO 2017150438A1 JP 2017007447 W JP2017007447 W JP 2017007447W WO 2017150438 A1 WO2017150438 A1 WO 2017150438A1
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- conductive paste
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
Definitions
- the present invention relates to a conductive paste, an electronic component, and a multilayer ceramic capacitor.
- Multilayer ceramic capacitors have a structure in which a plurality of dielectric layers and a plurality of internal electrode layers are alternately stacked. By reducing the thickness of these dielectric layers and internal electrode layers, the size and capacity can be reduced. Can be planned.
- the conductive powder and the organic vehicle are contained under conditions used in combination with a ceramic green sheet having a thickness of 5 ⁇ m or less containing butyral resin, and the solvent in the organic vehicle
- a conductive paste containing nyl acetate as a main component and having little change in viscosity over time is described.
- the conductive paste used for the internal electrode may contain a dispersant in order to improve the dispersibility of the conductive powder or the like (for example, Patent Document 3).
- the conductive powder also tends to have a smaller particle size.
- the particle size of the conductive powder is small, the specific surface area of the particle surface increases, so that the surface activity of the conductive powder (metal powder) is increased, which may result in a decrease in dispersibility and a decrease in viscosity characteristics. .
- Patent Documents 1 to 4 describe conductive pastes with little change in viscosity over time. However, as the thickening of the conductive paste over time becomes more problematic as the internal electrode layer becomes thinner, the conductive properties with improved viscosity characteristics have become available as the electrode pattern has become thinner in recent years. A paste is sought.
- an object of the present invention is to provide a conductive paste that has very little change in viscosity over time and is superior in viscosity stability.
- a conductive paste containing conductive powder, ceramic powder, a dispersant, a binder resin and an organic solvent, the dispersant containing an acid-based dispersant having a molecular weight of 500 or less, an acid
- the conductive dispersant is provided with a conductive paste having a branched hydrocarbon group having one or more branched chains.
- R 1 is a branched alkyl or branched alkenyl group having 10 to 20 carbon atoms having 10 to 20 carbon atoms.
- the acid-based dispersant is preferably contained in an amount of 0.01 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the conductive powder. Further, it is preferable that the dispersant further contains a base dispersant. The dispersant is preferably contained in an amount of 0.01 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the conductive powder.
- the conductive powder preferably contains at least one metal powder selected from Ni, Pd, Pt, Au, Ag, Cu, and alloys thereof.
- the conductive powder preferably has an average particle size of 0.05 ⁇ m or more and 1.0 ⁇ m or less.
- the ceramic powder preferably contains a perovskite oxide.
- the ceramic powder preferably has an average particle size of 0.01 ⁇ m or more and 0.5 ⁇ m or less.
- the binder resin preferably contains at least one of a cellulose resin, an acrylic resin, and a butyral resin.
- the viscosity immediately after production of the conductive paste is 100%, the viscosity after standing for 60 days is preferably 80% or more and 120% or less.
- the said electrically conductive paste is for internal electrodes of a multilayer ceramic component.
- an electronic component formed using the conductive paste is provided.
- FIG. 1 is a perspective view and a cross-sectional view showing a multilayer ceramic capacitor according to an embodiment.
- the average particle size of the conductive powder is preferably 0.05 ⁇ m or more and 1.0 ⁇ m or less, more preferably 0.1 ⁇ m or more and 0.5 ⁇ m or less.
- the average particle diameter of the conductive powder is in the above range, it can be suitably used as a paste for an internal electrode of a thin-film laminated ceramic capacitor, and for example, the smoothness of the dry film and the dry film density are improved.
- the average particle diameter is a value obtained from observation with a scanning electron microscope (SEM), and refers to a particle diameter having an integrated value of 50% in the particle size distribution.
- the content of the conductive powder is preferably 30% by mass to 70% by mass and more preferably 40% by mass to 65% by mass with respect to the total amount of the conductive paste.
- content of electroconductive powder is the said range, it is excellent in electroconductivity and dispersibility.
- the ceramic powder is not particularly limited.
- a known ceramic powder is appropriately selected depending on the type of multilayer ceramic capacitor to be applied.
- the ceramic powder include perovskite oxides containing Ba and Ti, and preferably barium titanate (BaTiO 3 ).
- 1 type may be used for ceramic powder and 2 or more types may be used for it.
- ceramic powder containing barium titanate as a main component and oxide as a subcomponent may be used.
- oxide include oxides composed of one or more selected from Mn, Cr, Si, Ca, Ba, Mg, V, W, Ta, Nb, and rare earth elements.
- the ceramic powder examples include a perovskite oxide ferroelectric ceramic powder in which Ba atoms and Ti atoms of barium titanate (BaTiO 3 ) are substituted with other atoms, for example, Sn, Pb, Zr, and the like. You can also
- the ceramic powder in the internal electrode paste a powder having the same composition as that of the dielectric ceramic powder constituting the green sheet of the multilayer ceramic capacitor may be used. Thereby, the generation of cracks due to the shrinkage mismatch at the interface between the dielectric layer and the internal electrode layer in the sintering process is suppressed.
- ceramic powder include, besides the perovskite oxide containing Ba and Ti, ZnO, ferrite, PZT, BaO, Al 2 O 3 , Bi 2 O 3 , R (rare earth element) 2 O 3. , TiO 2 , Nd 2 O 3 and other oxides.
- Binder resin It does not specifically limit as binder resin, A well-known resin can be used.
- the binder resin include cellulose resins such as methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose, and nitrocellulose, butyral resins such as acrylic resins and polyvinyl butyral. Among these, it is preferable to contain ethyl cellulose from the viewpoints of solubility in a solvent and combustion decomposability.
- One type of binder resin may be used, or two or more types may be used.
- the molecular weight of the binder resin is, for example, about 20,000 to 200,000.
- the content of the binder resin is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 1 part by mass or more and 8 parts by mass or less with respect to 100 parts by mass of the conductive powder.
- the content of the binder resin is preferably 0.5% by mass or more and 10% by mass or less, and more preferably 1% by mass or more and 6% by mass or less with respect to the total amount of the conductive paste.
- content of binder resin is the said range, it is excellent in electroconductivity and dispersibility.
- Organic solvent It does not specifically limit as an organic solvent, The well-known organic solvent which can melt
- organic solvents include dihydroterpinyl acetate, isobornyl acetate, isobornyl propionate, isobornyl butyrate, isobornyl isobutyrate, ethylene glycol monobutyl ether acetate, dipropylene glycol methyl ether acetate, and the like.
- terpene solvents such as terpineol and dihydroterpineol, saturated aliphatic hydrocarbon solvents such as tridecane, nonane, and cyclohexane.
- the organic solvent may use 1 type and may use 2 or more types.
- the organic solvent includes, for example, at least one acetate solvent (A) selected from dihydroterpinyl acetate, isobornyl acetate, isobornyl propionate, isobornyl butyrate and isobornyl isobutyrate. But you can. Among these, isobornyl acetate is more preferable.
- the organic solvent contains the acetate solvent (A) as a main component, the acetate solvent (A) is preferably contained in an amount of 90% by mass or more and 100% by mass or less, more preferably 100% by mass with respect to the entire organic solvent. Contained.
- the organic solvent may contain, for example, the above-mentioned acetate solvent (A) and at least one acetate solvent (B) selected from ethylene glycol monobutyl ether acetate and dipropylene glycol methyl ether acetate.
- A acetate solvent
- B acetate solvent selected from ethylene glycol monobutyl ether acetate and dipropylene glycol methyl ether acetate.
- the organic solvent preferably contains 50 mass% or more and 90 mass% or less of the acetate solvent (A) with respect to the entire organic solvent. More preferably, the content is 60% by mass or more and 80% by mass or less.
- the organic solvent contains 10% by mass to 50% by mass, more preferably 20% by mass to 40% by mass of the acetate solvent (B) with respect to 100% by mass of the whole organic solvent. .
- the content of the organic solvent is preferably 40 parts by mass or more and 90 parts by mass or less, and more preferably 45 parts by mass or more and 85 parts by mass or less with respect to 100 parts by mass of the conductive powder.
- the conductivity and dispersibility are excellent.
- the content of the organic solvent is preferably 20% by mass or more and 50% by mass or less, and more preferably 25% by mass or more and 45% by mass or less with respect to the total amount of the conductive paste.
- the conductivity and dispersibility are excellent.
- the electrically conductive paste of this embodiment contains the acid type dispersing agent which has a branched hydrocarbon group.
- the branched hydrocarbon group of the acid dispersant has one or more branched chains.
- the acid dispersant preferably has a carboxyl group.
- the reason is not limited, but the carboxyl group is adsorbed on the surface of the conductive powder, etc., neutralizing the surface potential, or inactivating the hydrogen bonding site, and the site other than the carboxyl group It is surmised that the specific three-dimensional structure as described above can effectively suppress aggregation of the conductive powder and the like, and can further improve the stability of the paste viscosity.
- the acid dispersant may be a compound having an amide bond.
- the acid dispersant preferably has a low molecular weight.
- the low molecular weight acid-based dispersant refers to an acidic dispersant having a molecular weight of 500 or less, for example.
- the lower limit of the molecular weight is preferably 100 or more, more preferably 200 or more.
- the said dispersing agent may use 1 type and may use 2 or more types.
- the hydrocarbon group in the acid-based dispersant may include one branched chain with respect to the main chain, or may include two or more branched chains.
- the number of branched chains is preferably 1 or more and 3 or less. Further, the number of branched chains may be 4 or more.
- the acid dispersant may be a mixture containing a plurality of acid dispersants having branched hydrocarbon groups having different branch positions.
- the paste viscosity stability over time can be further improved.
- the acid-based dispersant may be an acid-based dispersant having a complicated branched structure (for example, two or more branched chains).
- a complicated branched structure for example, two or more branched chains.
- Examples of the acid dispersant as described above include an acid dispersant represented by the following general formula (1).
- R 1 represents a branched alkyl group having 10 to 20 carbon atoms (or a branched alkenyl group having 10 to 20 carbon atoms).
- R 1 preferably has 15 to 20 carbon atoms, and more preferably 17 carbon atoms.
- R 1 may be a branched alkyl group or a branched alkenyl group having a carbon double bond, and is preferably a branched alkyl group.
- the presence or absence of a branched chain can be confirmed by, for example, the content of the methyl group (—CH 3 ) at the terminal of the hydrocarbon group calculated based on the 13 C-NMR or 1 H-NMR spectrum.
- the acid dispersant represented by the general formula (1) is a mixture, or when the structure of R 1 in the general formula (1) is a complicated structure having a plurality of branches, There may be a case where a clear peak indicating the R 1 portion is not detected. Even in this case, a peak indicating a terminal methyl group (—CH 3 ) is clearly observed.
- the content of the acid dispersant is preferably 0.5 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the conductive powder. Yes, more preferably 1 part by mass or more and 2 parts by mass or less.
- the content of the acid dispersant is preferably small, and the upper limit of the content of the acid dispersant is, for example, 1 part by mass or less. , Preferably it can be 0.5 mass part or less.
- the conductive paste of this embodiment for example, even when the acid-based dispersant is contained in an amount of 0.1 part by mass or more and 0.5 part by mass or less, the stability of the viscosity with time is sufficiently excellent.
- the conductive paste may contain a dispersant other than the above acid-based dispersion, for example, an acid-based dispersant having a linear hydrocarbon group.
- a dispersant other than the above-mentioned acid dispersion include acid dispersants such as higher fatty acids and polymer surfactants. These dispersants may be used alone or in combination of two or more.
- the higher fatty acid may be an unsaturated carboxylic acid or a saturated carboxylic acid, and is not particularly limited.
- stearic acid, oleic acid, myristic acid, palmitic acid, linoleic acid, lauric acid, linolenic acid and the like having 11 or more carbon atoms.
- oleic acid or stearic acid is preferred.
- alkyl monoamine salt types represented by monoalkylamine salts
- alkyldiamine salt types represented by N-alkyl (C14 to C18) propylenediamine dioleate.
- Alkyltrimethylammonium salt type represented by alkyltrimethylammonium chloride
- Alkyldimethylbenzylammonium salt type represented by coconut alkyldimethylbenzylammonium chloride
- Quaternary ammonium salt type represented by alkyl dipolyoxyethylenemethylammonium chloride
- Alkylpyridinium salt type tertiary amine type typified by dimethylstearylamine
- polyoxyethylene alkylamine type typified by polyoxypropylene / polyoxyethylene alkylamine
- surfactants selected from oxyethylene addition forms of
- alkyl monoamine salt type for example, oleoyl sarcosine, which is a compound of glycine and oleic acid, and an amide compound using a higher fatty acid such as stearic acid or lauric acid instead of oleic acid are preferable.
- the dispersant may include a dispersant other than the acid-based dispersant.
- examples of the dispersant other than the acid dispersion include a base dispersant, a nonionic dispersant, and an amphoteric dispersant. These dispersants may be used alone or in combination of two or more.
- the base dispersant examples include aliphatic amines such as laurylamine, rosinamine, cetylamine, myristylamine and stearylamine.
- the conductive paste contains the above acid-based dispersant having a branched hydrocarbon group and a base-based dispersion, the conductive paste is more excellent in dispersibility and superior in viscosity stability over time.
- the base dispersant may be contained in an amount of, for example, 0.2 parts by mass or more and 2.5 parts by mass or less, preferably 0.2 parts by mass or more and 1 part by mass or less with respect to 100 parts by mass of the conductive powder. May be.
- the base dispersant is contained in an amount of about 10 parts by mass to about 300 parts by mass, preferably 50 parts by mass or more and 150 parts by mass with respect to 100 parts by mass of the acid dispersant having the branched hydrocarbon group. be able to.
- the base dispersion is contained in the above range, the viscosity stability over time of the paste is more excellent.
- the dispersant other than the acid-based dispersant may be contained in an amount of, for example, 0.2 parts by mass or more and 2.5 parts by mass or less with respect to 100 parts by mass of the conductive powder. Further, the dispersant other than the acid dispersant can be contained in an amount of, for example, about 50 parts by mass or more and 300 parts by mass with respect to 100 parts by mass of the acid dispersant. Moreover, as a whole dispersing agent, it is preferable to contain 0.01 mass part or more and 3 mass parts or less with respect to 100 mass parts of electroconductive powder.
- the organic solvent for the vehicle is preferably the same as the organic solvent for the paste for adjusting the viscosity of the conductive paste in order to improve the familiarity of the organic vehicle.
- the content of the organic solvent for the vehicle is, for example, 5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the conductive powder.
- the content of the organic solvent for the conductive paste is preferably 10% by mass or more and 40% by mass or less with respect to the total amount of the conductive paste.
- the conductive paste has a viscosity after standing for 60 days, for example, 70% or more and 130% or less, preferably 80% or more and 120% or less, assuming that the viscosity immediately after the production of the conductive paste is 100%. More preferably, they are 85% or more and 115% or less, More preferably, they are 90% or more and 110% or less.
- the conductive paste can be suitably used for electronic parts such as multilayer ceramic capacitors.
- the multilayer ceramic capacitor has a dielectric layer formed using a dielectric green sheet and an internal electrode layer formed using a conductive paste.
- the dielectric ceramic powder contained in the dielectric green sheet and the ceramic powder contained in the conductive paste have the same composition.
- the multilayer ceramic device manufactured using the conductive paste of the present embodiment even when the thickness of the dielectric green sheet is, for example, 3 ⁇ m or less, sheet attack and green sheet peeling failure are suppressed.
- the multilayer ceramic capacitor 1 includes a multilayer body 10 and external electrodes 20 in which dielectric layers 12 and internal electrode layers 11 are alternately stacked.
- an internal electrode layer 11 made of a conductive paste is formed on a dielectric layer 12 made of a ceramic green sheet by a printing method, and a plurality of dielectric layers having the internal electrode layer on the upper surface are laminated by pressure bonding.
- the multilayer body 10 is fired and integrated to produce a multilayer ceramic fired body (not shown) that becomes a ceramic capacitor body.
- the multilayer ceramic capacitor 1 is manufactured by forming a pair of external electrodes at both ends of the ceramic capacitor body. This will be described in more detail below.
- a ceramic green sheet which is an unfired ceramic sheet.
- this ceramic green sheet for example, a dielectric layer paste obtained by adding an organic binder such as polyvinyl butyral and a solvent such as terpineol to a predetermined ceramic raw material powder such as barium titanate, a PET film or the like. Examples thereof include a sheet formed on a support film and dried to remove the solvent.
- the thickness of the dielectric layer made of the ceramic green sheet is not particularly limited, but is preferably 0.05 ⁇ m or more and 3 ⁇ m or less from the viewpoint of the demand for downsizing of the multilayer ceramic capacitor.
- a plurality of sheets are prepared by printing and applying the above-described conductive paste on one surface of the ceramic green sheet by a known method such as a screen printing method to form the internal electrode layer 11 made of the conductive paste.
- the thickness of the internal electrode layer 11 made of a conductive paste is preferably set to 1 ⁇ m or less after drying from the viewpoint of a request for thinning the internal electrode layer 11.
- the ceramic green sheets were peeled off from the support film, and the dielectric layers 12 made of the ceramic green sheets and the internal electrode layers 11 made of the conductive paste formed on one surface thereof were laminated alternately. Then, the laminated body 10 is obtained by heating and pressurizing treatment. In addition, it is good also as a structure which further arrange
- the organic binder in the green sheet is completely removed, and the ceramic raw material powder is fired to form the ceramic dielectric layer 12. Further, the organic vehicle in the internal electrode layer 11 is removed, and the nickel powder or the alloy powder containing nickel as a main component is sintered or melted and integrated to form an internal electrode.
- the dielectric layer 12 and the internal electrode A multilayer ceramic fired body in which a plurality of layers 11 are alternately stacked is formed. In addition, annealing may be performed on the fired multilayer ceramic fired body from the viewpoint of taking oxygen into the dielectric layer to improve reliability and suppressing reoxidation of the internal electrode.
- the multilayer ceramic capacitor 1 is manufactured by providing a pair of external electrodes 20 to the manufactured multilayer ceramic fired body.
- the external electrode 20 includes an external electrode layer 21 and a plating layer 22.
- the external electrode layer 21 is electrically connected to the internal electrode layer 11.
- copper, nickel, or these alloys can be used conveniently, for example.
- an electronic component other than the multilayer ceramic capacitor can be used.
- Ceramic powder As the ceramic powder, barium titanate (BaTiO 3 ; particle size 0.06 ⁇ m) was used.
- Binder resin Ethyl cellulose was used as the binder resin.
- Table 1 shows the dispersant used.
- FT-IR Fourier transform infrared spectroscopy
- Example 1 For 100 parts by mass of Ni powder, which is a conductive powder, 5.3 parts by mass of ceramic powder, 0.1 parts by mass of acid dispersant A, 5 parts by mass of binder resin, and 49 parts by mass of organic solvent are mixed. Thus, a conductive paste was produced. The viscosity (60 days later) of the produced conductive paste was evaluated by the above method. The evaluation results of the amount of change in paste viscosity are shown in Table 2 together with the content of the acid dispersant with respect to 100 parts by mass of Ni powder.
- Example 2 A conductive paste was prepared in the same manner as in Example 1 except that the content of the acid dispersant A was 0.5 parts by mass. The evaluation results of the amount of change in paste viscosity are shown in Table 2 together with the content of the acid dispersant with respect to 100 parts by mass of Ni powder.
- Example 3 A conductive paste was prepared in the same manner as in Example 1 except that the content of the acid dispersant A was 1.0 part by mass.
- Table 2 shows the characteristics of the dispersant used and the evaluation results of the amount of change in paste viscosity, together with the content of the acid dispersant with respect to 100 parts by mass of the Ni powder.
- Example 5 A conductive paste was produced in the same manner as in Example 1 except that the content of the acid dispersant A was 2.0 parts by mass. The evaluation results of the amount of change in paste viscosity are shown in Table 2 together with the content of the acid dispersant with respect to 100 parts by mass of Ni powder.
- Example 1 A conductive paste was prepared in the same manner as in Example 1, except that the acid dispersant was oleic acid (Table 1: No. 2, no hydrocarbon group branching). The evaluation results of the amount of change in paste viscosity are shown in Table 2 together with the content of the acid dispersant with respect to 100 parts by mass of Ni powder.
- Comparative Examples 2 to 4 Comparative Example, except that the content of the acid dispersant (oleic acid) was 0.5 parts by mass (Comparative Example 2), 1 part by mass (Comparative Example 3), and 1.5 parts by mass (Comparative Example 4), respectively.
- a conductive paste was prepared as in 1. The evaluation results of the amount of change in paste viscosity are shown in Table 2 together with the content of the acid dispersant with respect to 100 parts by mass of Ni powder.
- Example 6 11.6 parts by mass of ceramic powder and 0.6 parts by mass of dispersant (0.2 parts by mass of acid-based dispersant A, base) with respect to 100 parts by mass of Ni powder (particle size: 0.3 ⁇ m) as conductive powder
- a conductive paste was prepared by mixing 0.4 part by mass of a dispersant), 5 parts by mass of a binder resin, and 51 parts by mass of an organic solvent.
- myristylamine was used as the basic dispersant (Table 1: No. 9).
- the amount of change in viscosity (after 60 days) of the produced conductive paste was evaluated by the above method. The evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- Example 7 A conductive paste was prepared in the same manner as in Example 6 except that the content of the acid dispersant A was 0.5 parts by mass.
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- Example 8 A conductive paste was prepared in the same manner as in Example 6 except that the content of the acid dispersant A was 2.0 parts by mass.
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- Example 9 A conductive paste was produced in the same manner as in Example 7 except that the content of the ceramic powder was 5.3 parts by mass.
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- Example 10 Using Ni powder (particle size: 0.2 ⁇ m), the basic dispersant is myristylamine (Example 10), cetylamine (Example 11), stearylamine (Example 12), and the basic dispersant content is A conductive paste was produced in the same manner as in Example 9 except that the amount was 0.5 parts by weight.
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- a conductive paste was prepared in the same manner as in Example 6 except that 0.3 parts by mass of oleic acid (Comparative Example 11) and 0.3 part by mass of stearic acid (Comparative Example 12) were used as the acid dispersant. .
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- Example 14 A conductive paste was produced in the same manner as in Example 12 except that stearic acid was used as the acid dispersant.
- the evaluation results of the paste viscosity are shown in Table 3 together with the particle size of the Ni powder and the contents of the dispersant and the ceramic powder.
- content (mass part) in Table 3 shows the quantity with respect to 100 mass parts of Ni powder.
- the conductive paste of the present invention is extremely excellent in viscosity stability over time, and is particularly suitable for use as a raw material for internal electrodes of multilayer ceramic capacitors that are chip parts of electronic devices such as mobile phones and digital devices. Can do.
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Abstract
Description
導電性粉末は、特に限定されず、例えば、Ni、Pd、Pt、Au、Ag、Cu、およびこれらの合金から選ばれる1種以上の粉末を用いることができる。これらの中でも、導電性、耐食性及びコストの観点から、Ni、またはその合金の粉末が好ましい。Ni合金としては、例えば、Mn、Cr、Co、Al、Fe、Cu、Zn、Ag、Au、PtおよびPdからなる群より選択される少なくとも1種以上の元素とNiとの合金を用いることができる。Ni合金におけるNiの含有量は、例えば、50質量%以上、好ましくは80質量%以上である。また、Ni粉末は、脱バインダー処理の際、バインダー樹脂の部分的な熱分解による急激なガス発生を抑制するために、数百ppm程度のSを含んでもよい。
セラミック粉末としては、特に限定されず、例えば、積層セラミックコンデンサの内部電極用ペーストである場合、適用する積層セラミックコンデンサの種類により適宜、公知のセラミック粉末が選択される。セラミック粉末としては、例えば、Ba及びTiを含むペロブスカイト型酸化物が挙げられ、好ましくはチタン酸バリウム(BaTiO3)である。なお、セラミック粉末は、1種類を用いてもよく、2種類以上を用いてもよい。
バインダー樹脂としては、特に限定されず、公知の樹脂を用いることができる。バインダー樹脂としては、例えば、メチルセルロース、エチルセルロース、エチルヒドロキシエチルセルロース、ニトロセルロースなどのセルロース系樹脂、アクリル系樹脂、ポリビニルブチラールなどのブチラール系樹脂などが挙げられる。中でも、溶剤への溶解性、燃焼分解性の観点などからエチルセルロースを含むことが好ましい。また、内部電極用ペーストとして用いる場合、グリーンシートとの接着強度を向上させる観点からブチラール樹脂を含む、又は、ブチラール樹脂単体で使用してもよい。バインダー樹脂は、1種類を用いてもよく、又は、2種類以上を用いてもよい。また、バインダー樹脂の分子量は、例えば、20000~200000程度である。
有機溶剤としては、特に限定されず、上記バインダー樹脂を溶解することができる公知の有機溶剤を用いることができる。有機溶剤としては、例えば、ジヒドロターピニルアセテート、イソボルニルアセテート、イソボルニルプロピネート、イソボルニルブチレート、イソボルニルイソブチレート、エチレングリコールモノブチルエーテルアセテート、ジプロピレングリコールメチルエーテルアセテートなどのアセテート系溶剤、ターピネオール、ジヒドロターピネオールなどのテルペン系溶剤、トリデカン、ノナン、シクロヘキサンなどの飽和脂肪族炭化水素溶剤などが挙げられる。なお、有機溶剤は、1種類を用いてもよく、2種類以上を用いてもよい。
本実施形態の導電性ペーストは、分岐炭化水素基を有する酸系分散剤を含む。この酸系分散剤の分岐炭化水素基は、分岐鎖を1つ以上有する。本発明者は、導電性ペーストに用いる分散剤について、種々の分散剤を検討した結果、分岐炭化水素基を有する酸系分散剤を含むことにより、その理由は不明であるが、導電性ペーストの経時的粘度変化が非常に抑制されることを見出した。
本実施形態の導電性ペーストは、上記の各成分を用意し、ミキサーで攪拌・混練することにより製造することができる。その際、導電性粉末表面に予め分散剤を塗布すると、導電性粉末が凝集することなく十分にほぐれて、その表面に分散剤が行きわたるようになり、均一な導電性ペーストを得やすい。また、バインダー樹脂をビヒクル用の有機溶剤に溶解させ、有機ビヒクルを作製し、ペースト用の有機溶剤へ、導電性粉末、セラミック粉末、有機ビヒクル及び分散剤を添加し、ミキサーで攪拌・混練し、導電性ペーストを作製してもよい。
式:[60日間静置後の粘度-製造直後の粘度)/製造直後の粘度]×100)
以下、本発明の電子部品等の実施形態について、図面を参照しながら説明する。図面においては、適宜、模式的に表現することや、縮尺を変更して表現することがある。また、部材の位置や方向などを、適宜、図1などに示すXYZ直交座標系を参照して説明する。このXYZ直交座標系において、X方向およびY方向は水平方向であり、Z方向は鉛直方向(上下方向)である。
(導電性ペーストの粘度の変化量)
導電性ペーストの製造直後と、室温(25℃)で60日間静置後における、それぞれのサンプルの粘度を下記の方法で測定し、製造直後の粘度を基準(0%)とした場合の、各静置後のサンプルの粘度の変化量を百分率(%)で表した値を求めた([60日間静置後の粘度-製造直後の粘度)/製造直後の粘度]×100)。なお、導電性ペーストの粘度の変化量は少ないほど好ましい。
導電性ペーストの粘度:ブルックフィールド社製B型粘度計を用いて10rpm(ずり速度=4sec-1)の条件で測定した。
(導電性粉末)
導電性粉末としては、Ni粉末(粒径0.3μm)又は、Ni粉末(粒径0.2μm)を使用した。
セラミック粉末としては、チタン酸バリウム(BaTiO3;粒径0.06μm)を使用した。
バインダー樹脂としては、エチルセルロースを使用した。
表1に用いた分散剤を示す。
(1)分子量500以下の分岐炭化水素鎖を有する酸系分散剤Aとして、下記一般式(1)(R1=C17H35)で示される酸系分散剤を用いた(表1:No.1)。分岐鎖の有無は、1H-NMRのスペクトル及びフーリエ変換型赤外分光(FT-IR)を用いて確認した。これらの結果から、直鎖分岐鎖(直鎖炭化水素基)で検出されるピークが観察されず、末端のメチル基(-CH3)を示すピークが観察され、R1が1以上の分岐を有することを確認した。
(3)塩基系分散剤として、ミリスチルアミン、セチルアミン、ステアリルアミンを用いた(表1:No.9~11)。
有機溶剤としては、ターピネオールを使用した。
導電性粉末であるNi粉末100質量部に対して、セラミック粉末5.3質量部と、酸系分散剤A0.1質量部と、バインダー樹脂5質量部と、有機溶剤49質量部とを混合して導電性ペーストを作製した。作製した導電性ペーストの粘度(60日後)を上記方法で評価した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤Aの含有量を0.5質量部とした以外は、実施例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤Aの含有量を1.0質量部とした以外は、実施例1と同様に導電性ペーストを作製した。用いた分散剤の特徴とペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤Aの含有量を1.5質量部とした以外は、実施例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤Aの含有量を2.0質量部とした以外は、実施例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤をオレイン酸(表1:No.2、炭化水素基の分岐なし)とした以外は、実施例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に表2に示す。
酸系分散剤(オレイン酸)の含有量をそれぞれ0.5質量部(比較例2)、1質量部(比較例3)、1.5質量部(比較例4)とした以外は、比較例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に、表2に示す。
酸系分散剤を、ステアリン酸(比較例5)、ベヘン酸(比較例6)、オレオイルザルコシン(比較例7)、ラウリン酸(比較例8)、リノール酸(比較例9)、パルミトレイン酸(比較例10)とした以外は、実施例1と同様に導電性ペーストを作製した。ペースト粘度の変化量の評価結果を、Ni粉末100質量部に対する酸系分散剤の含有量と共に、表2に示す。
導電性粉末であるNi粉末(粒径:0.3μm)100質量部に対して、セラミック粉末11.6質量部と、分散剤0.6質量部(酸系分散剤A0.2質量部、塩基系分散剤0.4質量部)と、バインダー樹脂5質量部と、有機溶剤51質量部とを混合して導電性ペーストを作製した。なお、塩基性分散剤としては、ミリスチルアミンを用いた(表1:No.9)。作製した導電性ペーストの粘度の変化量(60日後)を上記方法で評価した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
酸系分散剤Aの含有量を0.5質量部とした以外は、実施例6と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
酸系分散剤Aの含有量を2.0質量部とした以外は、実施例6と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
セラミック粉末の含有量を5.3質量部とした以外は、実施例7と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
Ni粉末(粒径:0.2μm)を用い、塩基系分散剤をミリスチルアミン(実施例10)、セチルアミン(実施例11)、ステアリルアミン(実施例12)とし、塩基性分散剤の含有量を0.5重量部とした以外は、実施例9と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
酸系分散剤として、オレイン酸0.3質量部(比較例11)、ステアリン酸0.3質量部(比較例12)、を用いた以外は、実施例6と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
酸系分散剤として、オレイン酸を用いた以外は、実施例11と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
酸系分散剤として、ステアリン酸を用いた以外は、実施例12と同様に導電性ペーストを作製した。ペースト粘度の評価結果を、Ni粉末の粒径と、分散剤及びセラミック粉末の含有量と共に、表3に示す。なお、表3中の含有量(質量部)は、Ni粉末100質量部に対する量を示す。
実施例の導電性ペーストは、60日経過後のペースト粘度の変化量が、いずれの比較例の導電性ペーストと比べて、小さかった。よって、分子量500以下の分岐炭化水素鎖を有する酸系分散剤を含む導電性ペーストは、良好な粘度安定性を有することが示された。
10 セラミック積層体
11 内部電極層
12 誘電体層
20 外部電極
21 外部電極層
22 メッキ層
Claims (15)
- 導電性粉末、セラミック粉末、分散剤、バインダー樹脂及び有機溶剤を含む導電性ペーストであって、
前記分散剤は、分子量が500以下の酸系分散剤を含み、
前記酸系分散剤は、分岐鎖を1つ以上有する分岐炭化水素基を有する、
ことを特徴とする導電性ペースト。 - 前記酸系分散剤は、カルボキシル基を有する酸系分散剤であることを特徴とする請求項1に記載の導電性ペースト。
- 前記酸系分散剤は、前記導電性粉末100質量部に対して0.01質量部以上3質量部以下含有されることを特徴とする請求項1~3のいずれか一項に記載の導電性ペースト。
- 前記分散剤は、さらに塩基系分散剤を含むことを特徴とする請求項1~4のいずれか一項に記載の導電性ペースト。
- 前記分散剤は、前記導電性粉末100質量部に対して、0.01質量部以上3質量部以下含有されることを特徴とする請求項1~5のいずれか一項に記載の導電性ペースト。
- 前記導電性粉末は、Ni、Pd、Pt、Au、Ag、Cu及びこれらの合金から選ばれる少なくとも1種の金属粉末を含むことを特徴とする請求項1~6のいずれか一項に記載の導電性ペースト。
- 前記導電性粉末は、平均粒径が0.05μm以上1.0μm以下であることを特徴とする請求項1~7のいずれか一項に記載の導電性ペースト。
- 前記セラミック粉末は、ペロブスカイト型酸化物を含むことを特徴とする請求項1~8のいずれか一項に記載の導電性ペースト。
- 前記セラミック粉末は、平均粒径が0.01μm以上0.5μm以下であることを特徴とする請求項1~9のいずれか一項に記載の導電性ペースト。
- 前記バインダー樹脂は、セルロース系樹脂、アクリル系樹脂及びブチラール系樹脂のうち少なくとも1つを含むことを特徴とする請求項1~10のいずれか一項に記載の導電性ペースト。
- 前記導電性ペーストの製造直後の粘度を100%とした場合、60日間静置後の粘度が80%以上120%以下であることを特徴とする請求項1~11のいずれか一項に記載の導電性ペースト。
- 積層セラミック部品の内部電極用であることを特徴とする請求項1~12のいずれか一項に記載の導電性ペースト。
- 請求項1~13のいずれか一項に記載の導電性ペーストを用いて形成された電子部品。
- 誘電体層と内部電極とを積層した積層体を少なくとも有し、
前記内部電極は、前記1~13のいずれか一項に記載の導電性ペーストを用いて形成されたことを特徴とする積層セラミック積層体。
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| CN114746967B (zh) * | 2019-11-29 | 2024-09-24 | 住友金属矿山株式会社 | 凹版印刷用导电性浆料、电子部件以及叠层陶瓷电容器 |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201805954A (zh) | 2018-02-16 |
| MY188260A (en) | 2021-11-24 |
| CN108780673A (zh) | 2018-11-09 |
| JP6635186B2 (ja) | 2020-01-22 |
| KR102647944B1 (ko) | 2024-03-14 |
| JPWO2017150438A1 (ja) | 2019-01-31 |
| KR20180117121A (ko) | 2018-10-26 |
| TWI711053B (zh) | 2020-11-21 |
| CN108780673B (zh) | 2020-06-02 |
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