WO2004088675A1 - 内部電極用ペーストおよび電子部品の製造方法 - Google Patents
内部電極用ペーストおよび電子部品の製造方法 Download PDFInfo
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- WO2004088675A1 WO2004088675A1 PCT/JP2004/004178 JP2004004178W WO2004088675A1 WO 2004088675 A1 WO2004088675 A1 WO 2004088675A1 JP 2004004178 W JP2004004178 W JP 2004004178W WO 2004088675 A1 WO2004088675 A1 WO 2004088675A1
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- Prior art keywords
- paste
- mass
- internal electrode
- resin
- parts
- Prior art date
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Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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 method for manufacturing an electronic component having internal electrodes, such as a multilayer ceramic capacitor, and a paste for an internal electrode used in the manufacturing method.More specifically, it is possible to dry-transfer the internal electrodes.
- the present invention relates to a paste for internal electrodes having strength and adhesive strength, and a method for manufacturing an electronic component using the paste.
- the thickness of the dielectric green sheet constituting the dielectric layer has been reduced to several ⁇ or less.
- ceramic green sheets In order to manufacture ceramic green sheets, usually, ceramic powder, binders (acrylic resin, butyral resin, etc.), plasticizers (phthalates, dalicols, adipic acid, phosphates) and organic Prepare a ceramic paste consisting of a solvent (toluene, MEK, acetone, etc.). Next, this ceramic paste is applied to a carrier (PET, PET) using the doctor blade method or the like.
- binders acrylic resin, butyral resin, etc.
- plasticizers phthalates, dalicols, adipic acid, phosphates
- organic paste consisting of a solvent (toluene, MEK, acetone, etc.).
- this ceramic paste is applied to a carrier (PET, PET) using the doctor blade method or the like.
- a conductive paste for an internal electrode including an electrode material powder and a binder is printed in a predetermined pattern on the ceramic green sheet. Dry to form the internal electrode pattern. Thereafter, the green sheet is peeled off from the carrier sheet, and this is laminated to a desired number of layers.
- two methods have been devised: a method of peeling the green sheet from the carrier sheet before lamination and a method of peeling the carrier sheet after lamination and pressure bonding, but there is no significant difference.
- the laminate is cut into chips to form green chips. After firing these green chips, external electrodes are formed to manufacture electronic components such as multilayer ceramic capacitors.
- the interlayer thickness of the sheet on which the internal electrodes are formed is in the range of about 3 ⁇ m to 100 based on the desired capacitance required for the capacitor. Further, in the multilayer ceramic capacitor, a portion where an internal electrode is not formed is formed on an outer portion of the capacitor chip in the stacking direction.
- Mw degree of polymerization of 100 or less
- the reasons for this are to ensure sufficient adhesion of the ceramic green sheets during lamination, to reduce the surface roughness of the green sheets, to ensure the flexibility of the green sheets, and to reduce the viscosity of the slurry. And lowering it.
- the plasticizer phthalic acid, adipic acid, sebacic acid, and phosphoric esters can be generally used. Was.
- a release layer is first formed on a PET film as a support sheet, and an internal electrode layer is printed thereon. Further, in order to eliminate a step due to the thickness of the internal electrode layer, a blank pattern layer having the same thickness as the internal electrode layer is formed in a blank pattern portion where no electrode is formed.
- an adhesive resin layer (adhesive layer) is formed on a PET film other than the PET film on which the internal electrode layer is formed, and this is thermocompressed onto the internal electrode layer and the blank pattern layer. Transcribe. Then, the PET film on the resin layer side is peeled off.
- a dielectric green sheet is formed on another PET film, and this is transferred onto the resin layer by thermocompression bonding.
- the release layer, the electrode and the blank pattern layer, the resin layer, and the green sheet are integrated, and by sequentially laminating them, it is possible to laminate thin sheets without sheet attack.
- the adhesive layer used in the dry transfer method should be 0.1 ⁇ or less. It is effective in preventing naming. In order to obtain sufficient strength and adhesive strength even with such an ultra-thin layer, a plastic-based resin is extremely effective.
- Pastes for internal electrodes that have been used in conventional printing methods often consisted of an ethylcellulose resin, a metal powder, and a solvent.
- the ethylcellulose resin has low strength and low adhesive strength, the dry transfer method has a problem in that the electrode layer is likely to be broken or poor adhesion during the process.
- the metal weight per layer decreases due to the thinning of the electrodes, it is necessary to reduce the amount of metal adhesion when forming an internal electrode layer by a printing method. It is advantageous in terms of process cost to reduce the metal adhesion amount by reducing the metal content in the printing paste in conventional equipment.
- the solvent ratio is increased to lower the metal ratio, the ⁇ ⁇ -stroke viscosity rapidly decreases, and conventional printing equipment cannot cope.
- the binder resin may be reduced.
- the paste viscosity decreases, so a high-viscosity binder must be used.
- the present invention has been made in view of the above circumstances, and has an object to have a strength and an adhesive force capable of transferring an internal electrode in a dry manner, and to improve a metal filling rate and a smoothness of an internal electrode layer.
- An object of the present invention is to provide a paste for an internal electrode that can be increased and a method for producing an electronic component using the same.
- It is characterized by comprising an electrode material powder, a pinda resin containing a polybutyral resin and / or a polybiacetal resin as a main component, and a solvent.
- the internal electrode paste of the present invention may contain other additives in addition to the electrode material powder, the binder resin and the solvent.
- the internal electrode layer formed by the paste has high strength and adhesive strength, and the transfer of the adhesive layer is performed. Is relatively easy. Also, when the PET film as the support sheet is peeled off, the internal electrode layer is not easily destroyed.
- the internal electrode paste of the present invention further contains a plasticizer, and the plasticizer is contained in an amount of 25 parts by mass or more and 150 parts by mass or less based on 100 parts by mass of the binder resin.
- the amount of the plasticizer is preferably 25 parts by mass or more. However, if the amount exceeds 150 parts by mass, it is not preferable because excess plasticizer seeps out from the internal electrode layer formed using the paste.
- the plasticizer that can be used for the internal electrode paste of the present invention is not particularly limited, but is preferably dioctyl adipate (DOA), butylbutylene glycol phthalate (BPBG), didodecyl phthalate (DDP), or the like.
- DOA dioctyl adipate
- BPBG butylbutylene glycol phthalate
- DDP didodecyl phthalate
- DBP butylbutylene glycol phthalate
- DDP didodecyl phthalate
- DBP butylbutylene glycol phthalate
- DDP didodecyl phthalate
- DBP butylbutylene glycol phthalate
- DO P dioctyl phthalate
- the electrode material powder is contained at 50% by mass or less, more preferably less than 50 parts by mass, particularly preferably at most 48 parts by mass with respect to the whole internal electrode paste.
- the internal electrode thickness can be reduced by about 10% if the amount of paste as the paste is the same, Contributes to thinning.
- the content of the electrode material powder is preferably 40% by mass or more, and more preferably 43% by mass. That is all.
- the viscosity of the paste decreases, and problems such as bleeding easily occur when printing using the paste.
- it is effective to use a resin with high viscosity.
- a polybierbutyral resin and / or a polybutyl acetal resin is used as the pinda resin.
- these resins there are various grades of these resins.
- by selecting a polybutyral resin having a degree of polymerization of 140 or more and a Z or polyvinyl acetal resin it is possible to maintain the required viscosity even when the solvent ratio is increased.
- the degree of polymerization of a generally produced polybutyral resin and a polybutyral or polybutyl acetal resin is 360 or less. Therefore, preferably, the degree of polymerization of the polybutyral resin and the polybutyl acetate resin is 140 to 360.
- the polymerization degree of the polybutyral resin and / or the polyvinyl acetal resin may be 360 or more.
- a polybutyl acetal resin is particularly preferred. This is because, at the same degree of polymerization, the viscosity is higher than that of polybutyral resin. However, in the case of polyvinyl acetal resin, increasing the degree of acetalization increases the viscosity but tends to decrease the dry density. [0 0 3 1]
- the degree of acetalization of generally manufactured polybutyl acetal resin is about 50 to 74 mo 1%.
- Asetaru degree of poly Bulle ⁇ Se tar resin preferably 7 4 mol% or less, further preferably 6 6 mole 0/0 or less.
- the lower limit may be 5 Omo 1% or less.
- the binder resin is contained in 2.5 to 5.5 parts by mass with respect to 100 parts by mass of the electrode material powder.
- the ceramic powder is preferably contained in an amount of 1 to 20% by mass, more preferably 2 to 15% by mass, based on the entire paste. If the amount of the ceramic powder is too small, the dielectric layer and the electrode layer tend not to be matched at the time of firing, so that delamination is easily generated. If it is too large, the smoothness and continuity of the electrode will be impaired.
- the binder resin is used in an amount of 2.5 to 5.5 parts by mass with respect to a total of 100 parts by mass of the electrode material powder and the ceramic powder. included.
- the amount of the pinda resin is preferably 5.5 parts by mass or less based on 100 parts by mass of the pigment (electrode material powder and ceramic powder).
- the amount of the binder resin is too small, the strength is reduced, and a problem such as breakage of the internal electrode layer occurs in the dry transfer method. In order to obtain sufficient strength for the dry transfer method, 2.5 parts by mass or more of the binder resin is required for 100 parts by mass of the pigment.
- the paste contains ceramic powder in addition to the electrode material powder in the paste, the pigment and the ceramic material are used. If it is a combination of mic powder and does not contain ceramic powder, it refers only to the electrode material powder.
- the method for manufacturing an electronic component according to the present invention includes:
- This method is a method of manufacturing an electronic component by a dry transfer method.
- the binder resin contained in the paste for forming the green sheet 1 for forming the green sheet includes a polybutyral resin, and the degree of polymerization of the polybutyral resin is from 100,000 to 170,000 And the degree of petitialization of the resin is 64 mol. /. It is larger than 78 mol% and the residual acetyl group content is less than 6 mol%.
- the polymerization degree of the polybutyral resin is too small, sufficient mechanical strength as a green sheet can be obtained when the thickness is reduced. Tend to be difficult to obtain.
- the degree of polymerization is too large, the surface roughness when formed into a sheet tends to deteriorate.
- the degree of polybutyral of the polybutyral resin is too low, the solubility in the paste tends to deteriorate, and if it is too high, the surface roughness of the sheet tends to deteriorate. Further, if the residual acetyl group content is too large, the sheet surface roughness tends to deteriorate.
- the paste for an internal electrode according to the present invention includes, for example, the same as a binder resin contained in a paste for forming a green sheet to be a dielectric layer or a magnetic layer after firing. It is preferable to include various types of pinda resins. The same can be said for the case where an acryl resin is used as the binder resin for the green sheet paste. By using the same kind of pinda resin, it becomes easy to control the conditions in the debinding step.
- FIG. 1 is a schematic cross-sectional view of a multilayer ceramic capacitor according to one embodiment of the present invention
- FIG. 7 and FIG. 9 is a graph showing the relationship between the addition ft of the binder resin and the breaking strength of the internal electrode layer in the example of the present invention
- FIG. 10 is the amount of the plasticizer added and the peel strength of the support sheet in the example of the present invention. It is a graph which shows the relationship with.
- the multilayer ceramic capacitor 2 includes a capacitor. And a first terminal electrode 6 and a second terminal electrode 8.
- the capacitor body 4 has a dielectric layer 10 and an internal electrode layer 12, and the internal electrode layers 12 are alternately stacked between the dielectric layers 10.
- One of the alternately laminated internal electrode layers 12 is electrically connected to the inside of the first terminal electrode 6 formed outside one end of the capacitor body 4.
- the other internal electrode layers 12 alternately stacked are electrically connected to the inside of the second terminal electrode 8 formed outside the other end of the capacitor body 4.
- the internal electrode layer 12 is formed by transferring the electrode layer 12a to the ceramic green sheet 10a as shown in FIGS. 2 to 6, as will be described later in detail. .
- the material of the dielectric layer 10 is not particularly limited, and is made of, for example, a dielectric material such as calcium titanate, strontium titanate and Z or parium titanate.
- the thickness of each dielectric layer 10 is not particularly limited, but is generally several m to several hundred m. In particular, in the present embodiment, the thickness is reduced to preferably 5 / m or less, more preferably 3 ⁇ or less, and particularly preferably 1.5 ⁇ or less.
- the internal electrode layer 12 is also preferably thinned to 1.5 ⁇ or less, more preferably 1.2 m or less, and particularly preferably 1.0 ⁇ or less.
- the material of the terminal electrodes 6 and 8 is not particularly limited, but copper, a copper alloy, an Eckel-Nikel alloy or the like is usually used, but silver or an alloy of silver and palladium can also be used.
- the thickness of the terminal electrodes 6 and 8 is not particularly limited, but is usually about 10 to 50 ⁇ m.
- the shape and size of the multilayer ceramic capacitor 2 may be appropriately determined depending on the purpose and application.
- the multilayer ceramic capacitor 2 has a rectangular parallelepiped shape, it is usually vertical (0.6 to 5.6 mm, preferably 0.6 to 3.2 mm) X horizontal (0.3 to 5.0 mm, preferably 0.3 to 0.3 mm). 1.6 mm) X thickness (0.1 to 1.9 mm, preferably 0. 3 to: L. 6 mm).
- a dielectric paste (paste for a green sheet) is prepared in order to manufacture a ceramic green sheet that will constitute the dielectric layer 10 shown in FIG. 1 after firing.
- the dielectric paste is composed of an organic solvent-based paste obtained by kneading a dielectric material (ceramic powder) and an organic vehicle.
- the dielectric material various compounds that can be used as composite oxides and oxides, for example, carbonates, nitrates, hydroxides, organometallic compounds, and the like can be appropriately selected and used as a mixture.
- the dielectric material generally has an average particle diameter of 0.4 m or less, preferably 0.:! Used as a powder of about 3.0 ⁇ . In order to form an extremely thin green sheet, it is desirable to use a powder finer than the green sheet thickness.
- the binder used for the organic vehicle is not particularly limited, and various ordinary binders such as ethylcellulose, polybutyral, and acryl resin can be used.
- a polybutyral resin is used.
- the degree of polymerization of the polybutyral resin is from 1000 to 100, and preferably from 140 to 170.
- the degree of resin petit louis is 64 moles 0 /. Larger 7 less than 8 mole 0/0, preferably 6 4 mol 0/0 greater than 7 0 mole 0 /.
- the residual acetyl group content is less than 6 mol%, preferably 3 mol% or less.
- the organic solvent to be used for the organic vehicle also is not particularly limited, Terubi nail, butyl carbitol, acetone, c [0 0 5 4] the organic solvent is used, such as toluene
- the dielectric paste can be produced by mixing a dielectric material and a vehicle in which a water-soluble pinda is dissolved in water.
- the water-soluble binder is not particularly limited, and polyvinyl alcohol, methylcellulose, hydroxycetylcellulose, water-soluble acrylic resin, emulsion and the like are used.
- the content of each component in the dielectric paste is not particularly limited.
- the dielectric paste can be prepared so as to contain about 1% by mass to about 50% by mass of a solvent.
- the dielectric paste may contain additives selected from various dispersants, plasticizers, dielectrics, subcomponent compounds, glass frit, insulators and the like.
- the total content is desirably about 10% by mass or less.
- the content of the plasticizer is preferably about 25% by mass to about 100% by mass with respect to 100% by mass of the pinda resin. . If the amount of the plasticizer is too large, the plasticizer oozes out, and handling becomes difficult, which is not preferable.
- the green sheet 10a is formed with a thickness of about 0.5 to 10 ⁇ m.
- the green sheet 10a is dried after being formed on the carrier sheet 30.
- the drying temperature of the green sheet 10a is preferably 50 to 100 ° C., and the drying time is preferably 1 to 20 minutes.
- the thickness of the green sheet 10a after drying shrinks to 5 to 25% of the thickness before drying.
- the thickness of the green sheet after drying is preferably 3 ⁇ or less.
- the first support sheet is A carrier sheet 20 as a sheet is prepared, a release layer 22 is formed thereon, an electrode layer 12 a having a predetermined pattern is formed thereon, and before and after the electrode layer 12 a is formed.
- a blank pattern layer 24 having substantially the same thickness as the electrode layer 12a is formed on the surface of the release layer 22 where a is not formed.
- the carrier sheets 20 and 30 for example, PET films or the like are used, and those coated with silicon or the like to improve the releasability are preferable.
- the thickness of the carrier sheets 20 and 30 is not particularly limited, but is preferably 5 to 100 m. The thicknesses of these carrier sheets 20 and 30 may be the same or different.
- the release layer 22 preferably contains the same dielectric particles as the dielectric constituting the Darin sheet 10a shown in FIG. 3A.
- the release layer 22 contains a binder, a plasticizer, and a release agent in addition to the dielectric particles.
- the particle size of the dielectric particles may be the same as the particle size of the dielectric particles contained in the green sheet, but is preferably smaller.
- the thickness t2 of the release layer 22 is preferably not more than the thickness of the electrode layer 12a, preferably not more than 60%, more preferably not more than 30%. I do.
- the method of applying the release layer 22 is not particularly limited, but it is necessary to use a wire bar coater or a die coater, for example, since it is necessary to form the release layer 22 extremely thin.
- the thickness of the release layer can be adjusted by selecting a wire-to-bar coater having a different wire diameter. That is, in order to reduce the coating thickness of the release layer, one having a small diameter of the wire may be selected, and in order to form a thick layer, one having a large diameter of the wire may be selected.
- the release layer 22 is dried after the application.
- the drying temperature is preferably 50-100 ° C. and the drying time is preferably :! ⁇ 10 minutes.
- the binder for the release layer 22 may be, for example, an organic material made of atrial resin, polybutyral, polybutaester, polybutaconole, polyolefin, polyurethane, polystyrene, or an organic material made of these copolymers, or an emulsion. Be composed.
- the binder contained in the release layer 22 may be the same as or different from the binder contained in the green sheet 10a, but is preferably the same.
- plasticizer for the release layer 22 examples include, but are not particularly limited to, phthalic acid esters, dioctyl phthalate, adipic acid, phosphoric acid esters, and glycols.
- the plasticizer contained in the release layer 22 may be the same as or different from the plasticizer contained in the green sheet 10a.
- the release agent for the release layer 22 is not particularly limited, and examples thereof include paraffin, wax, and silicone oil.
- the release agent contained in the release layer 22 may be the same as or different from the release agent contained in the green sheet 10a.
- the binder is contained in the release layer 22 in an amount of preferably 2.5 to 200 parts by mass, more preferably 5 to 30 parts by mass, and particularly preferably 8 to 3 parts by mass with respect to 100 parts by mass of the dielectric particles. It is contained in about 0 parts by mass.
- the plasticizer is contained in the release layer 22 in an amount of 0 to 200 parts by mass, preferably 20 to 200 parts by mass, more preferably 50 to 100 parts by mass, based on 100 parts by mass of the binder. It is preferred that it is included in a part.
- the release agent is contained in the release layer 22 in an amount of 0 to 100 parts by mass, preferably 2 to 50 parts by mass, more preferably 5 to 20 parts by mass with respect to 100 parts by mass of the binder. This is preferred.
- an electrode layer 12 a that will constitute the internal electrode layer 12 after firing is formed in a predetermined pattern.
- the thickness of the electrode layer 12a is preferably about 0.1 to 5 ⁇ m, and more preferably about 0.1 to 1.5 m.
- the electrode layer 12a may be composed of a single layer, or may be composed of two or more layers having different compositions.
- the electrode layer 12a can be formed on the surface of the release layer 22 by a thick film forming method such as a printing method using an electrode paste, or a thin film method such as evaporation or sputtering.
- a thick film forming method such as a printing method using an electrode paste, or a thin film method such as evaporation or sputtering.
- a screen printing method or a gravure printing method which is one of the thick film methods, it is performed as follows.
- the electrode paste is made of a conductive material made of various conductive metals or alloys, or an electrode material powder such as various oxides, organometallic compounds, or resinates that become the above-mentioned conductive material after firing, and an organic vehicle. Prepare by kneading.
- the conductive material (electrode material powder) used in producing the electrode paste Ni, Ni alloy, or a mixture thereof is used.
- a conductive material is not particularly limited in its shape, such as a sphere or a flake, and a mixture of these shapes may be used.
- the particle diameter of the conductive material is usually about 0.1 to 2 ⁇ , preferably about 0.05 to 0.5 ⁇ m when it is spherical.
- the organic vehicle contains a binder and a solvent.
- the binder include, but are not limited to, ethyl cellulose, acrylic resin, polyvinyl butyral, polyvinyl oleraceta, polyvinylinoleanol, polyolefin, polyurethane, polystyrene, and copolymers thereof.
- a petiler such as a polybierbutyral resin and / or a polybutylacetal resin Is preferred.
- the binder resin is preferably contained in the electrode paste in an amount of 2.5 to 5.5 parts by mass with respect to 100 parts by mass of the conductor material (electrode material powder).
- the same ceramic powder (composite) as the ceramic powder contained in the green sheet paste may be contained in the electrode paste.
- the binder resin is preferably contained in the electrode paste in an amount of 100 parts by mass of the total mass of the conductor material (electrode material powder) and the ceramic powder (co-material). 5 to 5.5 parts by mass. If the amount of the binder resin is too small, the strength is reduced, and the dry transfer method tends to cause problems such as destruction of the electrode layer 12a. If the amount of the binder resin is too large, the electrode layer 12a is filled with metal before firing. The density tends to decrease, and it tends to be difficult to maintain the smoothness of the internal electrode layer 12 after firing.
- the electrode material powder is contained at 50% by mass or less based on the entire internal electrode paste.
- the thickness of the internal electrode layer 12a is about 10% if the amount of paste as the paste is the same. It can be reduced, contributing to thinning.
- the viscosity of the electrode paste composition is 15 1 ⁇ £ 1 1 ⁇ 20 type cone disk viscometer 25 ° C Shearing rate 8 [1 / s], viscosity is 4 Pas or more, preferably 6 P It is preferably at least a ⁇ s. If the viscosity is low at low shear rates, bleeding is likely to occur when printing. '
- a binder resin for the internal electrode paste polyvinyl alcohol is used.
- Rubutyral resin and z or polybutylacetal resin are used.
- the required viscosity can be maintained even when the solvent ratio is increased by selecting a polyvinyl butyral resin and / or a polyvinylinoleacetal resin having a degree of polymerization of 1400 or more.
- the degree of polymerization of generally produced polybutyral and Z or polybutyl acetal resin is 3600 or less.
- the polymerization degree of the polybutyral resin and / or the polyvinyl acetal resin is preferably 1400 to 3600.
- polyvinyl acetal is preferable, and the degree of acetalization is preferably 74 mol% or less.
- any of known solvents such as terbineol, dihydroterbineol, butyl carbitol, and kerosene can be used.
- the solvent content is preferably about 20 to 50% by mass with respect to the entire paste.
- the electrode paste contains a plasticizer.
- the plasticizer include ester phthalates such as benzyl butyl phthalate (BBP), adipic acid, phosphates, and glycols.
- ester phthalates such as benzyl butyl phthalate (BBP), adipic acid, phosphates, and glycols.
- BBP benzyl butyl phthalate
- DDP didodecyl phthalate
- D BP dibutyl phthalate
- BBP benzyl butyl phthalate
- DOP Dioctyl phthalate
- dibutyl sebacate and the like are used.
- dioctyl phthalate (DOP) is particularly preferred.
- the plasticizer is contained in an amount of preferably 25 to 150 parts by mass, more preferably 25 to 100 parts by mass, based on 100 parts by mass of the pinda resin.
- the amount of the plasticizer added is preferably 25 parts by mass or more. However, the amount added If the amount exceeds 150 parts by mass, it is not preferable because excess plasticizer oozes out of the electrode layer 12a formed using the paste.
- the electrode layer 1 2 is formed on the surface of the release layer 22 where the electrode layer 12 a is not formed.
- a blank pattern layer 24 having substantially the same thickness as a is formed.
- the blank pattern layer 24 is formed by the same method using the same paste as that for forming the green sheet 10a shown in FIG. 3A, except for the following.
- the dielectric paste for forming the blank pattern layer contains, in addition to the dielectric particles, a binder and a plasticizer, and a release agent as an optional component.
- the particle size of the dielectric particles may be the same as or different from the particle size of the dielectric particles contained in the ceramic green sheet.
- pinda for example, acrylic resin, polyvinyl butyral, polyvinyl acetal, polyvinyl alcohol, polyolefin, polyurethane, polystyrene, or an emulsion thereof can be used.
- the binder contained in the dielectric paste for forming the blank pattern layer may be the same as or different from the binder contained in the ceramic green sheet. Further, the binder contained in the dielectric paste for forming the blank pattern layer may be the same as or different from the electrode paste, but it is preferable to use the same binder.
- the plasticizer contained in the dielectric paste for forming the blank pattern layer is not particularly limited, and examples thereof include phthalate esters, adipic acid, phosphate esters, and glycols. .
- the plasticizer contained in the dielectric paste for forming the blank pattern layer may be the same as or different from the plasticizer contained in the ceramic green sheet.
- the dielectric paste for forming the blank pattern layer is about 0 to about 200 parts by mass, preferably about 20 to about 200 parts by mass with respect to 100 parts by mass of the binder. More preferably, it contains from about 50 parts to about 100 parts by weight of a plasticizer.
- the release agent contained in the dielectric paste for forming the blank pattern layer is not particularly limited, and examples thereof include paraffin, wax, and silicone oil.
- the dielectric paste for forming the blank pattern layer is about 0 to about 100 parts by weight, preferably about 2 to about 50 parts by weight, based on 100 parts by weight of the binder. Preferably, it contains from about 5 to about 20 parts by weight of a release agent.
- the viscosity of the paste for margin pattern paste is HAAK E RV-20 type conical disk viscometer. At a shear rate of 8 [1 / s] at 25 ° C, the viscosity is 4 Pa ⁇ s or more, preferably 7 It is preferably at least Pa.s. If the viscosity is low at low shear rates, bleeding is likely to occur when printing.
- This blank pattern paste is printed on a blank pattern portion between the electrode layers 12a, as shown in FIG. 2A. Thereafter, the electrode layer 12a and the blank pattern layer 24 are dried if necessary.
- the drying temperature of the electrode layer 12a and the blank pattern layer 24 is not particularly limited, but is preferably 70 to 120 ° C, and the drying time is preferably 1 to 10 minutes. It is.
- an adhesive layer 28 is formed on the surface of a carrier sheet 26 as a third support sheet.
- the carrier sheet 26 is composed of the same sheet as the carrier sheet 20 and the carrier sheet 30. [0 0 9 3]
- Adhesive layer 28 contains a binder and a plasticizer.
- the adhesive layer 28 may contain the same dielectric particles as the dielectric constituting the green sheet 10a, but when forming an adhesive layer having a thickness smaller than the particle diameter of the dielectric particles. It is better not to include dielectric particles.
- the particle diameter of the dielectric particles is preferably smaller than the particle diameter of the dielectric particles contained in the green sheet.
- the plasticizer is contained in the adhesive layer 28 in an amount of 0 to 200 parts by mass, preferably 20 to 200 parts by mass, more preferably 50 to 100 parts by mass, based on 100 parts by mass of the binder. It is preferred that it is included in a part.
- the thickness of the adhesive layer 28 is preferably about 0.02 to 0.3 ⁇ , and is preferably smaller than the average particle diameter of the dielectric particles contained in the green sheet. Further, it is preferable that the thickness of the adhesive layer 28 be 1/10 or less of the thickness of the green sheet 10a.
- the thickness of the adhesive layer 28 is too thin, the adhesive strength is reduced, and if it is too thick, a gap is easily formed inside the element body after sintering depending on the thickness of the adhesive layer. The capacity tends to decrease significantly.
- the adhesive layer 28 is formed on the surface of the carrier sheet 26 as a third support sheet by, for example, a bar coater method, a die coater method, a re-parse coater method, a dip coater method, a kiss coater method, etc. Dried accordingly.
- the drying temperature is not particularly limited, but is preferably room temperature to 80 ° C., and the drying time is preferably 1 to 5 minutes.
- a transfer method is employed in the present embodiment. That is, as shown in FIG. 2B, the adhesive layer 28 of the carrier sheet 26 is provided with an electrode as shown in FIG. 2B. It is pressed against the surface of the layer 12a and the marginal pattern layer 24, and heated and pressed. By peeling the carrier sheet 26, the adhesive layer 28 is transferred to the surface of the electrode layer 12a and the margin pattern layer 24 as shown in FIG. 2C. The transfer of the adhesive layer 28 may be performed on the surface of the green sheet 10a shown in FIG. 3A.
- the heating temperature during the transfer is preferably from 40 to 100 ° C., and the pressure is preferably from 0.2 to 15 MPa.
- the pressurization may be performed by a press or a calender roll, but is preferably performed by a pair of rolls.
- the electrode layer 12a is bonded to the surface of the green sheet 10a formed on the surface of the carrier sheet 30 shown in FIG. 3A.
- the electrode layer 12 a and the blank pattern layer 24 of the carrier sheet 20 are bonded to the surface of the green sheet 10 a via the adhesive layer 28 to form a carrier 20.
- the electrode layer 12a and the blank pattern layer 24 are transferred to the surface of the green sheet 10a as shown in FIG. 3C.
- the carrier sheet 30 on the green sheet side is peeled off, when viewed from the green sheet 10a side, the green sheet 10a is bonded to the electrode layer 12a and the margin pattern layer 24 by the adhesive layer 28. Transcribed via
- the heating and pressurizing at the time of the transfer may be pressurizing and heating by a press or pressurizing and heating by a calendar roll, but are preferably performed by a pair of rolls.
- the heating temperature and the pressure are the same as in the transfer of the adhesive layer 28.
- a single layer of the electrode layer 12a having a predetermined pattern is formed on the single green sheet 10a.
- the steps shown in FIGS. 4A to 6C may be repeated. 4A to 6C, members common to those shown in FIGS. 3A to 4C are denoted by the same reference numerals, and description thereof is partially omitted.
- the adhesive layer 28 is transferred to the front surface (rear surface) of the green sheet 10a on the side opposite to the electrode layer. Thereafter, as shown in FIGS. 5A to 5C, the electrode layer 12a and the blank pattern layer 24 are transferred to the back surface of the green sheet 10a via the adhesive layer 28.
- the green sheet 10a is transferred to the surface of the electrode layer 12a and the margin pattern layer 24 via the adhesive layer 28. . Thereafter, by repeating these transfers, as shown in FIG. 7, a laminated block in which a large number of electrode layers 12a and green sheets 10a are alternately laminated is obtained.
- the firing step in the next step is performed using the stacked block alone. Further, if necessary, such a plurality of laminated blocks may be laminated via an adhesive layer 28 formed by a transfer method in the same manner as described above to form a more multilayer laminated body.
- a green sheet 40 for an outer layer (a thick laminate obtained by laminating a plurality of green sheets on which no electrode layer is formed) is laminated. Then, the entire laminate is supported by the suction holding table 50. Thereafter, the upper carrier sheet 20 ′ is peeled off, and a green sheet 40 for an outer layer is similarly formed on the upper portion of the laminate, followed by final pressing.
- the pressure at the time of final pressurization is preferably 10 to 20 OMPa.
- the heating temperature is preferably 40 to 100 ° C.
- the laminate is cut into a predetermined size to form a green chip.
- the green chip is subjected to a binder removal treatment and a baking treatment, and then a heat treatment is performed to reoxidize the dielectric layer.
- the binder removal treatment may be performed under ordinary conditions. However, when a base metal such as Ni or Ni alloy is used as the conductor material of the internal electrode layer, it is particularly preferable to perform the treatment under the following conditions. Heating rate: 5 ⁇ 300 ° CZ time, especially 10 ⁇ 50 ° C / hour,
- Holding temperature 200 ⁇ 800 ° C, especially 350 ⁇ 600 ° C,
- Holding time 0.5-20 hours, especially :! ⁇ 10 hours
- Atmosphere wet mixed gas of N 2 and H 2.
- the firing conditions are preferably as follows.
- Heating rate 50-500 ° C / hour, especially 200-300 ° C / hour,
- Retention temperature 1100 ⁇ : 1300. C, especially 1 150-1250 ° C,
- Holding time 0.5-8 hours, especially 1-3 hours
- Cooling rate 50 ⁇ 500 ° C / hour, especially 200 ⁇ 300 ° C / hour,
- Atmosphere gas A humidified gas mixture of N 2 and H 2 .
- the oxygen partial pressure in an air atmosphere at firing is less 10-2 P a, it is preferably carried out in particular 10- 2-10 one 8 P a. If it exceeds the above range, the internal electrode layer tends to be oxidized. If the oxygen partial pressure is too low, the electrode material of the internal electrode layer tends to be abnormally sintered and cut off.
- the heat treatment after the calcination is preferably performed at a holding temperature or a maximum temperature of preferably 1000 ° C. or higher, more preferably 1000 to 1100. If the holding temperature or the maximum temperature during the heat treatment is less than the above range, the oxidation of the dielectric material is insufficient, so that the insulation resistance life tends to be shortened.
- the Ni of the internal electrode is oxidized, which not only reduces the capacity, but also reacts with the dielectric substrate, and the life tends to be shortened.
- the oxygen partial pressure during the heat treatment is higher than the reducing atmosphere during the firing, and is preferably from 10 to 3 Pa to lPa, more preferably from 10 to 2 Pa to lP. a. Below this range, re-oxidation of the dielectric layer 2 is difficult, and beyond this range, the internal electrode layer 3 tends to be oxidized.
- the other heat treatment conditions are preferably as follows.
- Retention time 0-6 hours, especially 2-5 hours
- Cooling rate 50 ⁇ 500 ° CZ time, especially 100 ⁇ 300 ° C / hour,
- Atmosphere gas Humidified N 2 gas, etc.
- a wetter In order to humidify the N 2 gas or the mixed gas, for example, a wetter may be used.
- the water temperature is preferably about 0 to 75 ° C.
- the binder removal treatment, the sintering, and the heat treatment may be performed continuously or independently. When performing these steps continuously, after removing the binder, the atmosphere is changed without cooling, the temperature is raised to the holding temperature during firing, firing is performed, and then cooling is performed to reach the holding temperature for heat treatment. It is preferable to change the atmosphere when performing the heat treatment.
- the temperature is raised in an N gas or humidified N 2 gas atmosphere to the holding temperature at the time of binder removal processing, and then the atmosphere is changed and the temperature is further raised
- the atmosphere is changed and the temperature is further raised
- the thermal treatment after raising the temperature to the holding temperature under N 2 gas atmosphere, then change the atmosphere or a wet N 2 gas atmosphere the entire process of the heat treatment.
- the thus obtained sintered body (element body 4) is subjected to end surface polishing by, for example, barrel polishing, sand plasting or the like, and baking the terminal electrode paste to form terminal electrodes 6, 8.
- the firing conditions for the terminal electrode paste are preferably, for example, in a humidified mixed gas of N 2 and H 2 at 600 to 800 ° C. for about 10 minutes to 1 hour.
- the terminal electrodes 6 and 8 are plated by plating or the like.
- a pad layer is formed.
- the terminal electrode paste may be prepared in the same manner as the above-mentioned electrode paste.
- the multilayer ceramic capacitor of the present invention thus manufactured is mounted on a printed circuit board or the like by soldering or the like, and is used for various electronic devices and the like.
- a polybiacetal resin having a specific range of the degree of polymerization, a specific range of the degree of petitialization, and a residual acetyl group content of a predetermined value or less is used as the green sheet. Therefore, even if the green sheet 10a is extremely thin, for example, about 5 ⁇ or less, the green sheet 10a has strength enough to withstand peeling from the carrier sheet 30, and has good adhesion and handling properties. Further, the surface roughness of the sheet 10a is small, and the sheet 10a is excellent in stackability. Therefore, it is easy to laminate a large number of green sheets 10a via the electrode layers 12a, and it is also possible to omit the adhesive layer 28 if necessary and laminate.
- the dry type electrode layer 12 a is precisely formed on the surface of the Darling sea M 0 a without breaking or deforming the green sheet 10 a. It is possible to transfer easily and with high accuracy.
- the adhesive layer 28 is formed on the surface of the electrode layer or the green sheet by a transfer method, and the electrode layer 12a is attached to the green sheet 10 via the adhesive layer 28. Adhere to the surface of a.
- the formation of the adhesive layer 28 eliminates the need for high pressure and heat when bonding and transferring the electrode layer 12a to the surface of the green sheet 10a, and enables bonding at lower pressure and lower temperature. Become. Therefore, even if the green sheet 10a is extremely thin, the green sheet 10a will not be destroyed, and the electrode layer 12a and the green sheet 10a can be laminated well, resulting in short-circuit failure, etc. Also does not occur. [0 1 2 0]
- the adhesive layer 28 and the electrode layer 12a have the same binder composition (polyvinyl butyral resin and / or polyvinyl acetal resin), the adhesiveness between the electrodes is greatly improved. Therefore, transfer becomes easy.
- the adhesive force of the adhesive layer 28 is made stronger than the adhesive force of the release layer 22, and the adhesive force of the release layer 22 is changed to green sheet 10 a and carrier sheet 30.
- the adhesive strength stronger than that of the above the carrier sheet 30 on the Darin sheet 10a side can be selectively and easily peeled off.
- the adhesive layer 28 is not formed directly on the surface of the electrode layer 12a or the green sheet 10a by a coating method or the like, but is formed by a transfer method.
- the component 28 does not permeate the electrode layer 12a or the green sheet 10a, and an extremely thin adhesive layer 28 can be formed.
- the thickness of the bonding layer 28 can be reduced to about 0.02 to 0.3 m. Even if the thickness of the adhesive layer 28 is thin, the components of the adhesive layer 28 do not penetrate into the electrode layer 12a or the green sheet 10a, so that the adhesive strength is sufficient and the electrode layer 12a Or, there is no possibility that the composition of the green sheet 10a is adversely affected.
- the viscosity of the blank pattern paste does not extremely decrease, and the extremely thin blank Good printing is possible even with a pattern layer. Further, since it is not necessary to increase the amount of the binder resin contained in the blank pattern paste, there is little possibility of occurrence of delamination between sheets when the binder is removed from the laminate.
- the internal electrode layer 12a formed by the paste has high strength and adhesive strength.
- the transfer of the adhesive layer 28 is relatively easy Easy. Further, when the carrier sheet 20 made of a PET film as a supporting sheet is peeled off, the internal electrode layer 12a is not easily broken.
- the method of the present invention is not limited to a method for manufacturing a multilayer ceramic capacitor, but can be applied to a method for manufacturing other multilayer electronic components such as a multilayer inductor and a multilayer substrate.
- B a T i 0 3 powder as a starting material for the ceramic powder (BT- 02 / Sakai Chemical Industry Co., Ltd.).
- B a T i 0 3 powder 100 parts by weight, (B a ⁇ e C a o 4..) S i 0 3: 1. 48 parts by weight, Y 2 O 3: 1. 01 parts by weight, M g CO 3: 0. 72 wt%, Ji 1: 2 0 3: 0. 13 mass%, and V 2 0 5: were prepared ceramic powder subcomponent additives to be 0.045 mass%.
- the accessory component additives were mixed in a ball mill to form a slurry. That is, the auxiliary component additive (a total amount of 8.8 g) and a solvent (16 g) containing ethanol and Zn-propanol in a ratio of 1: 1 were preliminarily pulverized by a ball mill for 20 hours.
- the degree of polymerization of the polyvinyl butyral resin as the binder resin was 1,400, the degree of butyralization was 69 mol% ⁇ 3 mol%, and the amount of residual acetyl group was 3 ⁇ 2 mol%.
- This pinda resin was contained in the ceramic paste in an amount of 6 parts by mass with respect to 100 parts by mass of the ceramic powder (including the ceramic powder and the auxiliary component additive). Further, when the total volume of the ceramic powder, the binder resin, and the plasticizer in the ceramic paste was 100% by volume, the volume ratio occupied by the ceramic powder was 67.31% by volume.
- DOP as a plasticizer was contained in the ceramic paste at 50 parts by mass with respect to 100 parts by mass of the binder resin. Water was contained at 2 parts by mass with respect to 100 parts by mass of the ceramic powder. The polyethylene glycol-based nonionic dispersant as a dispersant was contained in an amount of 0.7 part by mass with respect to 100 parts by mass of the ceramic powder.
- the paste contains an alcohol-based solvent and an aromatic-based solvent as a solvent. Assuming that the total mass of the agent and the aromatic solvent was 100 parts by mass, 15 parts by mass of toluene as an aromatic solvent was contained.
- the viscosity of the paste was 0.12 Pa ⁇ s.
- the viscosity of the paste was measured using a B-type viscometer when a rotation of 50 rpm was applied at 25 ° C. Production of green sheet
- the paste obtained as described above was applied to a PET film as the second support sheet shown in FIG.3A with a thickness of 5 jum using a wire bar coater, and dried to produce a green sheet 10a.
- the coating speed was 5 Om / min, and the drying conditions were as follows: the temperature in the drying oven was 60 to 70 ° C, and the drying time was 2 minutes.
- the paste for a dielectric layer was diluted twice with ethanol / toluene (55/10) at a weight ratio of 2 to obtain a paste for a release layer.
- this release layer contained 50 parts by mass of DOP as a plasticizer in the ceramic paste with respect to 100 parts by mass of the binder resin.
- Polyvinyl butyral resin was dissolved in MEK (methyl ethyl ketone), and 50 parts by mass of a plasticizer DOP was added to a 1.5% solution to prepare an adhesive paste.
- MEK methyl ethyl ketone
- the mixture was kneaded with a ball mill at the mixing ratio shown below, and slurried to obtain a paste for internal electrodes. That is, 100 parts by mass of 1 ⁇ 1 particles (electrode material powder) having an average particle size of 0.2 ⁇ 111 are the same as the ceramic powder (Ba) contained in the green sheet paste. 20 parts by mass of TiO 3 powder and ceramic powder by-product), 4.5 parts by mass of polybutyral resin, and 95 parts by mass of terpineol, and kneaded with a ball mill. Slurry and internal power It was used as an extreme paste.
- This polyvinyl butyral resin was contained in 3.8 parts by mass which was in the range of 2.5 to 5.5 parts by mass with respect to 100 parts by mass in total of Ni particles and ceramic powder.
- the degree of polymerization is 144, and the degree of petitalization is 69 moles 0 /.
- ⁇ 3 mol 0/0 and the residual Asechiru group amount 6 ⁇ 2 mole% of poly Bulle butyral resin in the same way as the internal electrode paste was prepared blank paste paste.
- the viscosity of the blank paste composition was 7 Pa ⁇ s at a shearing rate of 8 [1 / s] at 11 ° C. and a cone-shaped viscometer of a 20-inch cone type at 20 ° C. Further, this paste contained 40% by mass of ceramic powder with respect to the entire paste.
- the above-mentioned paste for the release layer is applied by a wire bar coater and dried to obtain a 0.3 ⁇ m release. A layer was formed.
- the electrode layer 12a and the blank pattern layer 24 were formed on the surface of the release layer.
- the electrode layer 12a was formed with a thickness of 1 ⁇ m by a printing method using the above-mentioned internal electrode paste.
- the blank pattern layer 24 was formed with a thickness of 1 ⁇ by a printing method using the above-mentioned blank pattern paste. When printing with the paste for margin pattern No inconvenience such as the paste flowing out of the mesh of the printing plate was observed.
- An adhesive layer 28 was formed on another PET film (third support sheet).
- the adhesive layer 28 was formed to a thickness of 0.1 / m by a wire-bar coater using the above-mentioned adhesive layer paste.
- the bonding layer 28 was transferred onto the surfaces of the electrode layer 12a and the blank pattern layer 24 by the method shown in FIG.
- a pair of rolls was used, the pressing force was IMPa, and the temperature was 80 ° C., and it was confirmed that the transfer was performed well.
- the internal electrode layer 12a and the blank pattern layer 24 were bonded (transferred) to the surface of the green sheet 10a via the bonding layer 28 by the method shown in FIG.
- a pair of rolls was used, the applied pressure was lMPa, and the temperature was 80 ° C. It was confirmed that the transfer was performed well.
- the adhesive force between the electrode layer 12a and the Darling sheet 10a was measured.
- the jig is perpendicular to the adhesive surface at a speed of 8 mm / min.
- the maximum stress at that time was taken as the adhesive strength.
- the adhesive strength was 3 ON / cm 2 or more, and it was confirmed that a strong adhesive strength was obtained.
- the reason why the adhesive force of 30 N / cm 2 or more could not be measured was due to the measurement limit of the jig for the measurement.
- the electrode layer 12a could be peeled off cleanly without adhering to the sheet 20 side. That is, as shown in Table 1, there was no problem in the peelability (PET peelability) of the carrier sheet.
- Example 1a except that the internal electrode paste was added with 25, 50, 75, and 100 parts by mass of dioctyl phthalate (DOP) as a plasticizer with respect to 100 parts by mass of the binder resin. Adjust the paste for the internal electrode in the same way The laminate shown in the figure was produced, and a similar test was performed. Table 1 shows the results.
- DOP dioctyl phthalate
- the peel strength is measured, for example, in the state shown in FIG. Force (mN / cm) was measured as the peel strength. Since the carrier sheet 20 is located on the release layer 22 side, in Table 1 and FIG. 10, the peel strength of the carrier sheet 20 is shown as the release layer side PET peel strength. Similarly, the peel strength of the carrier sheet 30 is shown as the PET peel strength on the dielectric layer side in Table 1 and FIG.
- the peel strength of the electrode layer including the polybutyral resin in this example could be reduced by adding a plasticizer such as DOP. That is, by adding a plasticizer of 25 PHR or more, the peel strength can be reduced to a level that does not cause a problem.
- the binder resin for the internal electrode paste an ethyl cellulose resin is used in place of the polybutyral resin, and the addition amount (PHR) of the DOP as a plasticizer to 100 parts by mass of the binder resin is 0 to Changes within the range of 150 parts by mass Except for that, the paste for the internal electrode was adjusted in the same manner as in Example 1b, and the laminated body shown in FIG. 3B was prepared, and the same test was performed. Table 1 shows the results.
- a binder resin for the internal electrode paste As shown in Table 2, as a binder resin for the internal electrode paste, a polybutyral resin or a polybiacetal resin was used.
- the internal electrode paste was prepared in the same manner as in Example 1a, except that the addition amount (metal content) was 45% by mass relative to the entire paste.
- Table 2 shows the results of measuring the 8% TPO lacquer viscosity and the viscosity of the electrode paste in each of these examples.
- the viscosity of the paste was determined by using the RV20 type cone-disk viscometer of Sharp Co., Ltd., and the viscosity (V8 (1 / s)) when applying a rotation at a shear rate of 8 [1 / s] at 25 ° C.
- the viscosity (V50 (1 / s)) when the rotation at which the shear rate was 50 [1 / s] was applied was measured.
- TPO lacquer viscosity refers to the viscosity of a vehicle in which 8 parts by mass of resin is dissolved in 92 parts by mass of turbineol
- the electrode paste viscosity refers to powder, plasticizer, etc. at a predetermined ratio. It means the viscosity of the blended electrode paste.
- the electrode layer 12a having a predetermined pattern as shown in Fig. To be formed by a printing method, the paste has a V8 (1 / s) viscosity of 4 or more, preferably 6 Pa ⁇ s or more. If the viscosity is lower than that, the paste will flow out of the mesh during printing and bleeding will easily occur, making printing difficult.
- the degree of polymerization of the polyvinyl butyral resin and the polyvinyl or acetal resin used for the electrode paste is 1400 or more.
- the dry densities of the electrode pastes in Examples 2a to 2k were each measured. Table 2 shows the results.
- the electrode paste was formed into a coating film with an applicator having a gap of 250 / m, dried at 100 ° C for 15 minutes, and calculated from the thickness and weight of a fixed area.
- Examples 2g, 2i, 2j and 2k when compared at the same degree of polymerization, the higher the degree of acetalization of polyvier acetal resin, the higher the viscosity but the higher the dry density Tends to decrease. If the dry density decreases, the continuity and smoothness of the electrode deteriorate after firing, so that a higher value is preferable.
- Viscosity measurement ⁇ company RV20 conical disk viscometer, at 25 ° C, shear rate 8 and 50 (1 / S)
- ethyl cellulose base resin was used as the binder resin for the internal electrode paste, and the Ni particles were added in an amount of 45% by mass or 50% by mass based on the entire internal electrode paste.
- An internal electrode paste was prepared in the same manner as in Example 1a except that (metal content) was changed.
- Table 2 shows the results of measuring the 8% TP% lacquer viscosity and the viscosity of the electrode paste in Comparative Example 2 in the same manner as in Examples 2a to 2k.
- the content of Ni particles is 50% by mass, the viscosity is high even with ethyl cellulose resin, and printing is possible, but the metal content is high, so it is difficult to thin the layer. .
- the addition ratio (PHP) of the polybutyral resin to the total 100 parts by mass of Ni particles and ceramic powder (co-material) in the paste for internal electrodes was 5.5 as shown in Table 3.
- the paste for the internal electrode was adjusted in the same manner as in Example la except that the amount was changed to 2.0 parts by mass, and a laminate shown in FIG. 3B was prepared, and it was confirmed whether dry transfer was possible.
- the paste for the internal electrode in each of these examples was formed into a coating film using an applicator having a gap of 250 ⁇ , dried at 100 ° C. for 15 minutes, and the dry density was measured. The measurement of dry density was calculated from the thickness and weight of a fixed area. Table 3 shows the results.
- the dry density of the electrode paste increases because the metal filling rate increases due to the decrease in the amount of resin in the electrode paste.
- the amount of resin is pigment (N i + When the amount is too small, the strength of the electrode layer is reduced and a problem occurs in the dry transfer process. Therefore, a resin amount of 3 PHP or more is preferable.
- the polybierptylal resin is in the range of 2.5 to 5.5 parts by mass with respect to 100 parts by mass of the total of the Ni particles and the ceramic powder. Was confirmed.
- the breaking strength of the electrode layer was measured as follows. That is, first, as shown in FIG. 2A, at a stage before bonding the adhesive layer 28 to the surface of the electrode layer 12 a formed using the electrode paste according to Examples 3d to 3i, Then, the laminate 20 of the release layer 22 and the electrode layer 12a was prepared. The electrode layer side of each laminate is supported at two points, and the rod is pushed at a speed of 8 mmZ from the center position of the support point and from the opposite side to the support point, and the pressure when the electrode layer 12a is broken is measured. The pressure was taken as the breaking strength (MPa).
- Table 3 and Fig. 9 show the relationship between the addition amount of the polybutyral resin to the total 100 parts by mass of the Ni particles and the ceramic powder, the amount of the binder PHP / (Ni + co-material), and the breaking strength. Show. As shown in Table 3 and FIG. 9, it was confirmed that the breaking strength was improved as the ratio of the polybutyral resin added increased. Electrodes capable of dry transfer have a breaking strength of 0.8 MPa or more, and a breaking strength of 0.8 MPa or more. In order to obtain the desired degree, it is necessary to add a polybutyral resin of 2.5 PHP or more to the pigment.
- a paste for an internal electrode having strength and adhesive strength that can withstand the dry transfer method even when the thickness of the green sheet electrode or the electrode layer is extremely small. It becomes possible to do. As a result, delamination between sheets and deformation of the laminate can be effectively prevented, and a method for manufacturing a paste for internal electrodes and a method for manufacturing an electronic component suitable for thinning and multilayering of the electronic component can be provided. Can be provided.
Abstract
Description
Claims
Priority Applications (2)
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US10/549,515 US7485244B2 (en) | 2003-03-31 | 2004-03-25 | Internal electrode paste and production method of electronic device |
JP2005504188A JP4894260B2 (ja) | 2003-03-31 | 2004-03-25 | 内部電極用ペーストおよび電子部品の製造方法 |
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US (1) | US7485244B2 (ja) |
JP (1) | JP4894260B2 (ja) |
KR (1) | KR100776462B1 (ja) |
CN (1) | CN100481273C (ja) |
TW (1) | TWI256654B (ja) |
WO (1) | WO2004088675A1 (ja) |
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JP2012129181A (ja) * | 2010-12-15 | 2012-07-05 | Samsung Electro-Mechanics Co Ltd | 内部電極用導電性ペースト組成物、それを用いた積層セラミック電子部品及びその製造方法 |
JP2013135096A (ja) * | 2011-12-27 | 2013-07-08 | Tdk Corp | 電極焼結体、積層電子部品、内部電極ペースト、電極焼結体の製造方法、積層電子部品の製造方法 |
JP2016508079A (ja) * | 2012-12-21 | 2016-03-17 | エプコス アクチエンゲゼルシャフトEpcos Ag | 多層キャリア基板の製造方法 |
CN113507805A (zh) * | 2021-07-07 | 2021-10-15 | Oppo广东移动通信有限公司 | 壳体、其制备方法及电子设备 |
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KR100776462B1 (ko) | 2007-11-28 |
TW200425187A (en) | 2004-11-16 |
KR20060006021A (ko) | 2006-01-18 |
CN1799109A (zh) | 2006-07-05 |
JPWO2004088675A1 (ja) | 2006-07-06 |
CN100481273C (zh) | 2009-04-22 |
JP4894260B2 (ja) | 2012-03-14 |
TWI256654B (en) | 2006-06-11 |
US20060197062A1 (en) | 2006-09-07 |
US7485244B2 (en) | 2009-02-03 |
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