WO2023080027A1 - 熱硬化型導電性樹脂組成物及び電子部品の製造方法 - Google Patents
熱硬化型導電性樹脂組成物及び電子部品の製造方法 Download PDFInfo
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- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/06—Polysiloxanes containing silicon bound to oxygen-containing groups
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
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- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
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- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
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- 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
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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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
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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- 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
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
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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
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
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- C08K2003/0806—Silver
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
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- C08K2003/085—Copper
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- C08K2201/001—Conductive additives
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
Definitions
- the present invention provides an electrode for an electronic component for manufacturing an electronic component by forming an electrode on a to-be-electrode-formed body for an electronic component, such as a laminate for a multilayer electronic component and a to-be-cathode-formed body for a solid electrolytic capacitor.
- the present invention relates to thermosetting conductive resin compositions for forming.
- the present invention provides an electronic component for manufacturing an electronic component by forming an electrode on an electrode forming body for an electronic component such as a laminate for a multilayer electronic component and a cathode forming body for a solid electrolytic capacitor. related to the manufacturing method of
- Patent Document 1 discloses a composition that does not contain an epoxy resin and is composed of a gel-like silicone rubber (polydimethylsiloxane) and a conductive powder.
- a composition containing an epoxy resin is used while maintaining moisture resistance in the sense that the permeation of the plating solution can be effectively blocked. It is described that the flexural strength of the external electrode which is even better than that can be obtained.
- the proportion of the conductive component in the conductive resin layer obtained by heating the composition decreases. It is preferable that the content ratio of the resin binder in the inside is small. Therefore, when a plurality of types of resins are used, the ratio of each resin to the total components forming the conductive resin layer is often reduced, and the characteristics obtained when a single resin is used are obtained. may not be available.
- Patent Literature 1 achieves bending strength superior to conventional examples by using silicone rubber alone, as opposed to conventional examples in which epoxy resin and silicone rubber are combined.
- the flexural properties obtained with silicone rubber alone cannot be obtained by combining multiple resins such as silicone rubber and epoxy resin.
- Patent Document 1 As mentioned above, it is described in Patent Document 1 that a certain level of moisture resistance can be obtained by using silicone rubber. When used for conductive purposes, it is often difficult to obtain conductivity.
- the desired moisture resistance may not be obtained.
- the first object of the present invention is to be able to form a conductive resin layer that has high moisture resistance and excellent conductivity even when multiple types of resins including silicone resins are used as the resin binder.
- An object of the present invention is to provide a thermosetting conductive resin composition.
- a second object of the present invention is to enable formation of a conductive resin layer having high moisture resistance and excellent conductivity even when a plurality of types of resins including silicone resin are used as a resin binder. and to provide a thermosetting conductive resin composition that easily satisfies other properties.
- thermosetting conductive resin composition for forming a conductive resin layer containing flaky conductive powder and a resin binder.
- the resin binder contains a thermosetting silicone resin having a hydroxyl group, and 25.0% by mass or more of the resin binder is the thermosetting silicone resin having a hydroxyl group, so that the silicone resin is used as the resin binder.
- a conductive resin composition can be obtained, and have completed the present invention.
- the present invention (1) is a thermosetting conductive resin composition containing a conductive powder and a resin binder, wherein the conductive powder includes a flake-shaped conductive powder, and the resin binder contains Provided is a thermosetting conductive resin composition comprising a thermosetting silicone resin having a hydroxyl group, wherein 25.0% by mass or more of the resin binder is the thermosetting silicone resin having a hydroxyl group. .
- the present invention (2) is a thermosetting thermosetting resin composition in which 4.0% by mass or more of the components forming the conductive resin layer obtained by heating the thermosetting conductive resin composition have the hydroxyl group.
- the present invention provides the thermosetting conductive resin composition (1), which is a silicone resin.
- the present invention (3) is the thermosetting conductive resin composition of (1) or (2), wherein 70.0% by mass or less of the resin binder is the thermosetting silicone resin having the hydroxyl group. It provides
- the present invention (4) also provides the thermosetting conductive resin composition according to any one of (1) to (3), wherein the resin binder further contains a thermoplastic resin.
- the resin binder further contains one or more selected from the group consisting of cellulose resins, acetal resins, polyamide resins, epoxy resins, acrylic resins and (meth)acrylic resins.
- a thermosetting conductive resin composition according to any one of (1) to (4) is provided.
- the present invention (6) provides the thermosetting conductive resin composition according to any one of (1) to (5), which has a moisture permeability of 80.0 mg or less as determined by a moisture permeability measurement test. It is.
- ⁇ Moisture permeability measurement test> The conductive resin composition was cast on a PET film to a thickness of 250 ⁇ m, cured at 200° C. for 60 minutes, and the resulting cured film was cut into a circle with a diameter of 7.5 mm.
- the present invention (7) provides the thermosetting conductive resin composition according to any one of (1) to (5), which has an elongation of 0.40% or more as determined by the following elongation measurement test. is.
- ⁇ Elongation measurement test> The conductive resin composition was cast on a PET film to a thickness of 250 ⁇ m, cured under the conditions of 200° C. for 60 minutes, and the obtained cured film was cut into a rectangle with a width of 5 mm, and the long axis was measured using a viscoelasticity measuring device.
- the present invention (8) provides a preparatory step of preparing an electrode forming body for an electronic component, an electrode forming step of forming an electrode on the outer surface of the electrode forming body for an electronic component; has In the electrode forming step, the thermosetting conductive resin composition of any one of (1) to (7) is applied to the electronic component electrode forming body, and then the thermosetting conductive resin composition is applied. Forming a conductive resin layer on the electronic component electrode forming body by curing; To provide a method for manufacturing an electronic component characterized by
- the present invention even when a plurality of types of resins including silicone resin are used as a resin binder, it has high moisture resistance and is capable of forming a conductive resin layer having excellent conductivity.
- a resin composition can be provided. Further, according to the present invention, it is possible to form a conductive resin layer having high moisture resistance and excellent conductivity even when multiple types of resins including silicone resin are used as the resin binder, and Furthermore, it is possible to provide a thermosetting conductive resin composition that easily satisfies other properties.
- thermosetting conductive resin composition of the present invention is a thermosetting conductive resin composition containing conductive powder and a resin binder, wherein the conductive powder includes flake-shaped conductive powder,
- the thermosetting conductive resin composition, wherein the resin binder contains a thermosetting silicone resin having a hydroxyl group, and 25.0% by mass or more of the resin binder is the thermosetting silicone resin having a hydroxyl group. .
- thermosetting conductive resin composition of the present invention is a thermosetting conductive resin composition that is cured by heating to form a cured film (conductive resin layer).
- the heating temperature is not particularly limited, it may be, for example, within the range of 150°C to 300°C and within the range of 180°C to 250°C.
- the thermosetting conductive resin composition of the present invention contains conductive powder as a conductive material.
- conductive powders having a coating layer containing Ag such as alloy powders, silver-coated copper powders and silver-coated nickel powders. At least one of Ag and Cu is preferably contained in terms of excellent conductivity, silver powder and silver-coated copper powder are more preferred, and silver powder is particularly preferred.
- Silver-coated copper powder, copper powder, and copper alloy powder that does not contain expensive metal components such as noble metals and rare metals are preferred, and copper powder is particularly preferred, because of their low cost.
- the coating layer containing Ag may cover at least part of the surface of the copper powder, nickel powder, or the like.
- the conductive powder contains flaky conductive powder, and the flaky conductive powder preferably accounts for 20.0% by mass or more of the total conductive powder, It is more preferably 40.0% by mass or more, still more preferably 60.0% by mass or more, and particularly preferably 80.0% by mass or more.
- the obtained conductive resin layer has high conductivity and adhesiveness.
- the conductive powder may further contain spherical conductive powder.
- the aspect ratio of the flaky conductive powder is preferably 1.5 to 50.0, more preferably 2.0 to 30.0, particularly preferably 5.0 to 20.0.
- the obtained conductive resin layer has high conductivity and adhesiveness.
- the length and thickness of 50 arbitrarily selected conductive powders are measured in scanning electron microscope (SEM) image observation, and the average value of the ratio of the length to the thickness (length / thickness) is obtained.
- SEM scanning electron microscope
- the number average particle diameter of the flake-shaped conductive powder when measured using a scanning electron microscope (SEM) is preferably 0.1 to 20.0 ⁇ m, more preferably 0.3 to 15.0 ⁇ m, still more preferably 0.5 to 10.0 ⁇ m, particularly preferably 1.0 to 5.0 ⁇ m.
- SEM scanning electron microscope
- the major diameters of 50 arbitrarily selected conductive powders were measured by SEM (scanning electron microscope) image observation, and the average value was taken as the number average particle size of the flake-shaped conductive powder.
- the specific surface area of the flaky conductive powder is preferably 0.5 to 5.0 m 2 /g, particularly preferably 0.6 to 4.0 m 2 /g.
- the obtained conductive resin layer has high conductivity and adhesiveness.
- the volume-based cumulative 50% particle diameter (D 50 ) of the spherical conductive powder is preferably 0.01 to 7.0 ⁇ m, particularly preferably 0.03 to 5.0 ⁇ m.
- D 50 was determined as a 50% value (D 50 ) in the integrated fraction based on volume using a laser diffraction particle size distribution analyzer.
- the specific surface area of the spherical conductive powder is preferably 0.2-3.0 m 2 /g, particularly preferably 0.3-2.5 m 2 /g.
- the obtained conductive resin layer has high conductivity and adhesiveness.
- thermosetting conductive resin composition of the present invention contains at least a thermosetting silicone resin having a hydroxyl group as a resin binder, and 25.0% by mass or more of the total resin binder is a thermosetting silicone having a hydroxyl group. Resin.
- thermosetting silicone resin having a hydroxyl group is preferably a condensation-type thermosetting silicone resin that has a hydroxyl group and is cured by a condensation reaction by heating. It is more preferably a dehydration condensation type silicone resin that cures as it progresses, and is a dehydration condensation type thermosetting silicone resin that has hydroxyl groups (silanol groups) bonded to silicon atoms and in which a dehydration condensation reaction proceeds when heated. is particularly preferred.
- thermosetting conductive resin composition of the present invention 25.0% by mass or more of the total resin binder is a thermosetting silicone resin having a hydroxyl group. Even when a resin other than the curable silicone resin is used in combination, a conductive resin layer having high moisture resistance and excellent conductivity can be formed.
- thermosetting conductive resin composition of the present invention the content ratio of the thermosetting silicone resin having a hydroxyl group to the total resin binder is said to provide a conductive resin layer having excellent moisture resistance and excellent conductivity. point, preferably 30.0% by mass or more, more preferably 40.0% by mass or more, more preferably 50.0% by mass or more, more preferably 60.0% by mass or more, more preferably 70.0% by mass Above, more preferably 80.0% by mass or more, more preferably 90.0% by mass or more, and particularly preferably 95.0% by mass or more.
- thermosetting conductive resin composition of the present invention the content ratio of the thermosetting silicone resin having a hydroxyl group with respect to the total resin binder is high while obtaining a conductive resin layer having high moisture resistance and excellent conductivity. Furthermore, in terms of easily satisfying other characteristics, preferably 95.0% by mass or less, more preferably 90.0% by mass or less, more preferably 80.0% by mass or less, more preferably 70.0% by mass or less, More preferably less than 70.0% by mass, more preferably 60.0% by mass or less, more preferably 50.0% by mass or less, more preferably 40.0% by mass or less, particularly preferably 35.0% by mass or less be.
- the other properties include one or more of flexibility, impact resistance, printability, heat resistance, and the like.
- thermosetting conductive resin composition of the present invention includes those having a high elongation measured by the elongation measuring method specified in the specification of the present application. This increases the impact resistance, and facilitates the relaxation of stress caused by deflection of the substrate due to physical impact, thermal impact, or the like.
- thermosetting conductive resin composition of the present invention preferably contains 4.0% by mass or more, more preferably 4.0% by mass or more, of the components forming the conductive resin layer obtained by heating the thermosetting conductive resin composition.
- thermosetting conductive resin composition of the present invention preferably contains 15.0% by mass or less, more preferably 15.0% by mass or less, of the components forming the conductive resin layer obtained by heating the thermosetting conductive resin composition. is 14.0% by mass or less, more preferably 13.0% by mass or less, more preferably 12.0% by mass or less, more preferably 11.0% by mass or less, more preferably 10.0% by mass or less, more preferably is 9.0% by mass or less, more preferably 8.0% by mass or less, more preferably 7.0% by mass or less, and particularly preferably 6.0% by mass or less is a thermosetting silicone resin having a hydroxyl group. , while obtaining a conductive resin layer having high moisture resistance and excellent conductivity, it is easy to satisfy other characteristics.
- the other properties include one or more of flexibility, impact resistance, printability, heat resistance, and the like.
- thermosetting conductive resin composition of the present invention comprises a conductive powder, a resin binder, and a conductive powder that forms a conductive resin layer obtained by heating the thermosetting conductive resin composition;
- a thermosetting silicone resin having a hydroxyl group is a thermosetting silicone resin having a hydroxyl group, so that it has excellent moisture resistance and excellent conductivity. This is preferable because a resin layer can be obtained.
- thermosetting conductive resin composition of the present invention comprises a conductive powder, a resin binder, and the conductive powder or Of the total amount of other components different from the resin binder, preferably 15.0% by mass or less, more preferably 14.0% by mass or less, more preferably 13.0% by mass or less, more preferably 12% by mass 0% by mass or less, more preferably 11.0% by mass or less, more preferably 10.0% by mass or less, more preferably 9.0% by mass or less, more preferably 8.0% by mass or less, more preferably 7 .0% by mass or less, particularly preferably 6.0% by mass or less, is a thermosetting silicone resin having a hydroxyl group, so that a conductive resin layer having high moisture resistance and excellent conductivity can be obtained. It is easy to satisfy other characteristics.
- the other properties are one or more of flexibility, impact resistance, printability, heat resistance, and the like.
- Thermosetting silicone resins with hydroxyl groups can be cured by heating without using a curing agent or catalyst.
- a condensation-curing type in which condensation reaction proceeds by heating to cure is preferred, and a dehydration-condensation type in which dehydration-condensation reaction proceeds by heating to cure is particularly preferred.
- the position and number of hydroxyl groups in the thermosetting silicone resin having hydroxyl groups are not particularly limited. It is preferable that at least side chains have a plurality of hydroxyl groups in terms of excellent conductivity.
- a hydroxyl group may be bonded to a silicon atom, or may be bonded to an atom other than a silicon atom (for example, a carbon atom).
- an OH group bonded to Si in a silanol group is also referred to as a hydroxyl group.
- the main skeleton (main chain) of the thermosetting silicone resin having a hydroxyl group may have siloxane units, and examples thereof include polymers consisting only of siloxane units (polysiloxane) and copolymers containing siloxane units. be done.
- copolymers containing siloxane units include copolymers of at least one of monomers, oligomers and polymers containing siloxane units and at least one of monomers, oligomers and polymers not containing siloxane units. These polymers and copolymers may be linear or branched.
- thermosetting silicone resin having a hydroxyl group may have a functional group other than a hydroxyl group on the side chain or end of the polymer, such as an alkenyl group, a hydrogensilyl group, a (meth)acryloyl group, an epoxy group. , an amino group, a carbinol group, a mercapto group, a carboxy group, a phenol group, an aryl group, an alkyl group such as a methyl group, and an aromatic group such as a phenyl group.
- a functional group other than a hydroxyl group on the side chain or end of the polymer such as an alkenyl group, a hydrogensilyl group, a (meth)acryloyl group, an epoxy group.
- an amino group a carbinol group, a mercapto group, a carboxy group, a phenol group, an aryl group, an alkyl group such as a methyl group, and an aromatic group such as a
- the functional groups of the thermosetting silicone resin are preferably alkyl groups such as methyl groups and aromatic groups such as phenyl groups from the viewpoint of moisture resistance, hydroxyl groups are preferable from the viewpoint of conductivity, and epoxy groups are preferable from the viewpoint of adhesiveness. preferable.
- thermosetting silicone resin having a hydroxyl group may be a modified resin in which various oligomers, polymers, etc. are introduced (grafted) to the side chains or terminals of the polymer, or a crosslinked resin in which the resins are crosslinked. good.
- the molecular weight (weight average molecular weight Mw) of the thermosetting silicone resin having hydroxyl groups is not particularly limited, but is preferably 1,000 to 300,000, particularly preferably 2,000 to 200,000.
- thermosetting conductive resin composition of the present invention may further contain a curing agent and a catalyst, for example, platinum-based, titanium-based, aluminum-based, zinc-based, iron-based, phosphoric acid-based curing agents catalysts.
- a catalyst for example, platinum-based, titanium-based, aluminum-based, zinc-based, iron-based, phosphoric acid-based curing agents catalysts.
- the thermosetting conductive resin composition of the present invention may further contain a resin different from the thermosetting silicone resin having hydroxyl groups.
- the resin different from the thermosetting silicone resin having a hydroxyl group may be a thermosetting resin or a thermoplastic resin.
- Thermosetting resins are preferred from the viewpoint of heat resistance, and thermoplastic resins are preferred from the viewpoint of impact resistance and flexibility.
- Examples of resins different from thermosetting silicone resins having hydroxyl groups include cellulose resins such as ethyl cellulose, acetal resins such as polyvinyl acetal resins, polyimide resins, polyamide resins, polyamideimide resins, epoxy resins, acrylic resins, polybutadiene, and the like.
- Butadiene-based resins (meth)acrylic resins, styrene resins, phenolic resins, alkyd resins, polyurethane resins, silicone resins different from the thermosetting silicone resins having hydroxyl groups, and the like.
- polyvinyl acetal resins include polyvinyl formal resins, polyvinyl acetoacetal resins, and polyvinyl butyral resins, with polyvinyl butyral resins being particularly preferred.
- polyvinyl butyral resin may be simply referred to as "butyral resin".
- thermoplastic resins particularly ethyl cellulose resins and polyvinyl.
- Acetal resins, polyamide resins, acrylic resins, and (meth)acrylic resins are preferred.
- Thermoplastic silicone resins are preferred from the viewpoint of moisture resistance.
- an epoxy resin as the resin
- a polyvinyl acetal resin as the resin
- the flexibility of the conductive resin layer can be improved while maintaining high moisture resistance and conductivity of the conductive resin layer.
- the flexibility can be improved while maintaining high moisture resistance and conductivity of the conductive resin layer.
- an acrylic resin as the resin
- the flexibility can be improved while maintaining high moisture resistance and conductivity of the conductive resin layer.
- a polyimide resin as the resin, heat resistance can be improved while maintaining high moisture resistance and conductivity of the conductive resin layer.
- the content of the resin binder in the thermosetting conductive resin composition of the present invention is preferably 3.0 to 30.0 parts by mass, more preferably 3.0 to 30.0 parts by mass, per 100.0 parts by mass of the conductive powder. 28.0 parts by mass, more preferably 3.0 to 25.0 parts by mass, more preferably 5.0 to 25.0 parts by mass, more preferably 7.0 to 23.0 parts by mass, particularly preferably 11.0 parts by mass. 0 to 20.0 parts by mass.
- a conductive resin layer having excellent conductivity and adhesiveness can be easily obtained.
- it tends to be excellent in printability when the conductive resin composition is applied to the electrode formation body.
- thermosetting conductive resin composition of the present invention can further contain an organic solvent.
- the organic solvent contained is not particularly limited, and examples thereof include terpineol, dihydroterpineol, dihydroterpineol acetate, secondary butyl alcohol, butyl carbitol, butyl carbitol acetate, and benzyl alcohol.
- thermosetting conductive resin composition of the present invention can contain additives such as antifoaming agents, plasticizers, dispersants, and rheology modifiers, if necessary.
- Plasticizers include dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate, di-n-octyl phthalate, butyl benzyl phthalate, dioctyl adipate, diisononyl adipate, dibutyl sebacate, sebacic acid.
- Rheology modifiers include, for example, silica powder.
- thermosetting conductive resin composition of the present invention is suitably used for forming external electrodes of multilayer electronic components and for forming cathodes of solid electrolytic capacitors.
- the moisture permeability of the thermosetting conductive resin composition of the present invention is preferably 80.0 mg or less. Since the moisture permeability is within the above range, an electronic component having excellent moisture resistance can be obtained when a conductive resin layer is formed using the conductive resin composition of the present invention.
- the method for measuring the moisture permeability of the conductive resin composition of the present invention is not particularly limited, it can be measured, for example, by the following moisture permeability measurement test. ⁇ Moisture permeability measurement test> The conductive resin composition was cast on a PET film to a thickness of 250 ⁇ m, cured at 200° C. for 60 minutes, and the resulting cured film was cut into a circle with a diameter of 7.5 mm.
- the specific resistance of the conductive resin layer obtained using the thermosetting conductive resin composition of the present invention is preferably 500 ⁇ cm or less, more preferably 250 ⁇ cm or less.
- the method for measuring the resistivity of the conductive resin composition of the present invention is not particularly limited, it can be measured, for example, by the following resistivity measurement test.
- ⁇ Resistance measurement test> A conductive resin composition was cast on a slide glass substrate to a width of 1 cm, a length of 5 cm, and a thickness of 50 ⁇ m, and cured at 200° C. for 60 minutes to obtain a cured film. Instruments, KEITHLEY 2002) is used to measure the resistance of the surface of the cured film by the four-probe method, and the specific resistance is calculated from the obtained value and the thickness of the sample.
- the elongation rate of the conductive resin layer obtained using the thermosetting conductive resin composition of the present invention is preferably 0.20% or more, more preferably 0.30% or more, and more preferably 0.40% or more. , more preferably 0.45% or more, particularly preferably 0.50% or more. Also, the elongation rate of the conductive resin layer obtained using the thermosetting conductive resin composition of the present invention is not particularly limited, but can be, for example, 5.0% or less. Since the conductive resin layer whose elongation rate is within the above range is formed between the metal layer and the plated layer of the external electrode of the multilayer electronic component, cracks and interfacial peeling occur at the connecting portion between the substrate and the electronic component.
- the method for measuring elongation is not particularly limited, but for example, it can be measured by the following elongation measurement test.
- ⁇ Elongation measurement test> A cured film obtained by casting a conductive resin composition on a PET film with a thickness of 250 ⁇ m and curing under conditions of 200 ° C.
- the adhesion strength of the conductive resin layer obtained using the thermosetting conductive resin composition of the present invention is preferably 0.2 MPa or more, more preferably 0.3 MPa or more, still more preferably 0.4 MPa or more, and particularly preferably is 0.5 MPa or more.
- the adhesion strength of the conductive resin layer obtained using the thermosetting conductive resin composition of the present invention is not particularly limited, but can be, for example, 20.0 MPa or less. Since the conductive resin layer having the adhesion strength within the above range is formed between the metal layer and the plated layer of the external electrodes of the multilayer electronic component, cracks and interfacial peeling occur at the connection portion between the substrate and the electronic component.
- the impact resistance of the electronic component is enhanced. Therefore, by using the conductive resin composition of the present invention to form between the metal layer and the plated layer of the external electrode of the multilayer electronic component, the impact resistance of the electronic component can be enhanced. In addition, the excellent adhesion strength makes it difficult for the conductive resin layer to peel off from the electronic component electrode forming body, so that the moisture resistance of the component can be easily maintained.
- the method for measuring the adhesion strength is not particularly limited, it can be measured, for example, by the following adhesion strength measurement test.
- a conductive resin composition was cast on a slide glass substrate to a thickness of 50 ⁇ m, placed on an aluminum cylinder with a diameter of 3 mm, cured at 200 ° C. for 60 minutes, and subjected to a bond tester (manufactured by Seishin Shoji Co., Ltd., model number: SS-30WD). ) in the vertical direction at a speed of 0.5 mm/s and measure the value when it breaks.
- thermosetting conductive resin composition of the present invention is used to form an electrode on an electrode forming body on which an electrode is formed (hereinafter also referred to as an electrode forming body for electronic parts) in the manufacture of electronic parts. is suitable as a conductive resin composition.
- the thermosetting conductive resin composition of the present invention is particularly suitable as a conductive resin composition for forming an external electrode of a laminate for laminated electronic components and a cathode for forming a cathode of a solid electrolytic capacitor. is.
- thermosetting conductive resin composition of the present invention in a method of manufacturing an electronic component having a preparation step of preparing an electrode-forming body for an electronic component and an electrode forming step of forming an electrode on the outer surface of the electrode-forming body for an electronic component , can be used, and in the electrode forming step, the thermosetting conductive resin composition of the present invention is used to impart conductivity to the electronic component electrode forming body.
- a resin layer is formed to form an electrode.
- the preparation step is a step of preparing an electrode forming body for electronic components.
- the electronic component electrode forming body refers to an object on which an electrode is formed in the manufacturing process of the electronic component.
- Electrode-formed bodies for electronic parts include a laminate for electronic parts consisting of a plurality of ceramic layers and a plurality of internal electrode layers, a solid electrolytic capacitor consisting of an anode and a dielectric layer formed on the surface of the anode. Examples include a cathode forming body and an electrode forming body for a chip resistor having end face electrodes.
- a multilayer electronic component laminate is composed of a plurality of ceramic layers and a plurality of internal electrode layers.
- adjacent ceramic layers are connected to each other by internal electrode layers interposed therebetween.
- laminated bodies for laminated electronic components include laminated bodies for laminated ceramic capacitors, laminated bodies for laminated ceramic inductors, and laminated bodies for piezoelectric actuators.
- Examples of the material for forming the ceramic layer that constitutes the multilayer electronic component laminate include barium titanate, strontium titanate, calcium titanate, barium zirconate, strontium zirconate, calcium zirconate, strontium calcium zirconate, and the like. .
- a cathode forming body for a solid electrolytic capacitor consists of an anode and a dielectric layer formed on the surface of the anode.
- Combinations of materials for forming the anode and the dielectric layer include tantalum and tantalum pentoxide, aluminum and aluminum oxide, niobium and niobium pentoxide, and the like.
- the electrode forming step is a step of forming electrodes on the outer surface of the electrode-forming body for electronic components.
- forming a conductive resin layer on the electronic component electrode forming body means forming a conductive resin layer directly on the surface of the electronic component electrode forming body. It includes both cases in which another layer or film (for example, a metal layer, a conductor layer) or the like is first formed on the electrode forming body, and a conductive resin layer is formed on the surface thereof.
- the conductive resin layer is formed directly on the surface of the electronic component electrode forming body, and between the electronic component electrode forming body.
- the conductive resin layer is formed with another layer or film (for example, a metal layer, a conductor layer) interposed therebetween.
- the position and method of forming the electrodes, the thickness of the electrodes, the number of electrodes, the type of metal that constitutes the electrodes, the shape of the conductive powder used for electrode formation, etc. are appropriately selected according to the electronic component to be manufactured. be done.
- thermosetting conductive resin composition of the present invention is used to form a conductive resin layer on the electronic component electrode forming body.
- thermosetting conductive resin composition of the present invention is applied to the electronic component electrode forming body so that the thermosetting conductive resin composition of the present invention is applied to a predetermined position of the electronic component electrode forming body.
- a conductive resin layer is formed by forming a layer of the conductive resin composition and then curing the thermosetting conductive resin composition of the present invention. The curing described above is performed by heating.
- the conductive resin composition of the present invention is applied directly to the surface of the electronic component electrode-forming body, thereby forming a conductive resin layer directly on the surface of the electronic component electrode-forming body. can be formed. Further, in the electrode forming step, before the conductive resin layer is formed on the electronic component electrode forming body, an appropriate step can be included depending on the type of the electronic component. For example, in the case of a laminated electronic component, in the electrode forming step, after forming a metal layer on a predetermined position of an electrode forming body for electronic components, the thermosetting conductive resin composition of the present invention is applied to the surface of the metal layer.
- thermosetting conductive resin composition of the present invention is formed at a predetermined position of the electrode forming body for electronic parts by applying a material, etc., and then the thermosetting conductive resin of the present invention.
- a conductive resin layer is formed on the surface of the metal layer.
- the heat treatment of the present invention is applied to the surface of the conductive layer.
- the conductive resin composition layer of the present invention is formed at a predetermined position of the electrode-forming body for electronic parts by coating the curable conductive resin composition, and then the conductive resin composition of the present invention. By curing the material, a conductive resin layer is formed on the surface of the conductive layer.
- an appropriate step can be included depending on the type of the electronic component. For example, in the case of a laminated electronic component, in the electrode forming step, a conductive resin layer is formed at a predetermined position of an electrode forming body for electronic components, and then a plated layer is formed on the surface of the conductive resin layer.
- electrodes can be formed by forming a conductive resin layer on the electronic component electrode forming body. That is, in this form, the electrode is configured only by the conductive resin layer.
- the conductive resin composition of the present invention is used on the electronic component electrode forming body to form a conductive resin layer, and the electronic component electrode forming body is subjected to the dipping method.
- a layer of the conductive resin composition of the present invention can be formed on a predetermined position of an electrode forming body for electronic parts.
- the electronic component electrode forming body is a multilayer electronic component laminate comprising a ceramic layer and an internal electrode layer.
- the electrode forming step (1) includes a conductive resin layer forming step (1A) of forming a conductive resin layer on the outer surface of the multilayer electronic component laminate using the conductive resin composition of the present invention. , at least have.
- the electrode forming step (1) includes a conductive resin layer forming step (1A) of forming a conductive resin layer on the outer surface of the multilayer electronic component laminate using the conductive resin composition of the present invention. It is not particularly limited as long as it is, and for example, an electrode forming step (1) comprising at least a metal layer forming step, a conductive resin layer forming step (1A), and a plated layer forming step can be mentioned.
- the metal layer forming step is a step of forming a metal layer electrically connected to the internal electrode layer on the outer surface of the multilayer electronic component laminate.
- the metal forming the metal layer includes at least one of Cu, Ag, Pd, Ni, Sn, Al, Au and Pt, or an alloy containing one or more of these.
- a method for forming the metal layer is not particularly limited, and examples thereof include a dipping method, a plating method, a roll coating method, a screen printing method, and a sputtering method. The thickness, shape, position, number, etc. of the metal layers are appropriately selected.
- the conductive resin layer forming step (1A) is a step of forming a conductive resin layer using the conductive resin composition of the present invention on the surface of the metal layer formed by performing the metal layer forming step.
- the conductive resin composition of the present invention is applied to the surface of the metal layer formed by performing the metal layer forming step, thereby forming the conductive resin composition of the present invention on the surface of the metal layer.
- a conductive resin layer is formed by forming a layer of the conductive resin composition and then curing the conductive resin composition of the present invention.
- a method for forming the conductive resin layer is not particularly limited, and examples thereof include a dipping method, a screen printing method, and a roll coating method. Among these, the dipping method is preferred.
- the thickness, shape, position, number, etc. of the conductive resin composition layer of the present invention are appropriately selected.
- the plated layer forming step is a step of forming a plated layer on the surface of the conductive resin layer.
- the metal forming the plated layer includes at least one of Ni, Cu, Sn, Ag and Au, or an alloy containing one or more of these.
- the method of forming the plated layer is not particularly limited, and examples thereof include electrolytic plating and electroless plating. The thickness, shape, position, number, etc. of the plated layers are appropriately selected.
- a second form of the electrode forming step (hereinafter also referred to as an electrode forming step (2)) is an electrode forming step in the case where the electrode forming body for electronic components is a cathode forming body for solid electrolytic capacitors. .
- the electrode forming step (2) is a conductive resin layer forming step of forming a conductive resin layer on the outer surface of the cathode forming body for a solid electrolytic capacitor using the thermosetting conductive resin composition of the present invention. (2A) at least.
- thermosetting conductive resin composition of the present invention is used to form a conductive resin layer ( 2A) is not particularly limited, for example, an electrode forming step (2) comprising at least a solid electrolyte layer forming step, a carbon layer forming step, and a conductive resin layer forming step (2A). is mentioned.
- the solid electrolyte layer forming step is a step of forming a solid electrolyte layer on the outer surface of the cathode forming body for a solid electrolytic capacitor.
- the method for forming the solid electrolyte layer is not particularly limited, and it can be formed by a known solid electrolyte produced by a chemical method. is mentioned.
- the carbon layer forming step is a step of forming a carbon layer on the solid electrolyte layer.
- the method for forming the carbon layer is not particularly limited, and for example, a method of applying a carbon paste containing a resin, a solvent, and carbon powder onto the solid electrolyte layer by a dipping method, followed by drying and/or curing. mentioned.
- Carbon powder is not particularly limited, but graphite powder is preferred.
- the conductive resin layer forming step (2A) is a step of forming a conductive resin layer on the carbon layer using the conductive resin composition of the present invention.
- the method for forming the conductive resin layer is not particularly limited. and a method of curing a flexible resin composition.
- the electrode forming step (3) is the electrode forming step (3) in the case where the electronic component electrode forming body is a chip resistor electrode forming body having end face electrodes.
- the electrode forming step (3) has at least a step of forming a conductive resin layer on the end face electrodes.
- the method for forming the conductive resin layer is not particularly limited. and a method of curing the thermosetting conductive resin composition.
- An electrode forming body for a chip resistor having end face electrodes includes, for example, an insulating substrate, a pair of upper surface electrodes formed on the insulating substrate, a resistor formed between the pair of upper surface electrodes, and a pair of upper surface electrodes. It comprises a protective layer formed so as to partially cover the resistor, and an edge electrode formed on the edge of the insulating substrate.
- the electrode forming step (4) has at least a step of forming a conductive resin layer on the substrate.
- the method for forming the conductive resin layer is not particularly limited, and for example, the thermosetting conductive resin composition of the present invention is applied by screen printing, inkjet printing, or dispenser printing, A method of curing the conductive composition is included.
- substrates include alumina substrates, glass epoxy substrates, paper phenol substrates, and paper epoxy substrates.
- the electrode forming step (5) has at least a step of forming a conductive resin layer on the film.
- the method for forming the conductive resin layer is not particularly limited, and for example, the thermosetting conductive resin composition of the present invention is applied by screen printing, inkjet printing, or dispenser printing, A method of curing the conductive composition is included.
- films include polyimide films and PET films.
- a silver-coated copper powder coated with silver was produced in a ratio of 10 parts by mass to 90 parts by mass of spherical copper powder (manufactured by Mitsui Kinzoku, model number: MA-CO3K), and the resulting spherical silver-coated copper powder was obtained.
- Conductive powder 2 was pulverized in a ball mill using palmitic acid as a lubricant to produce flaky silver-coated copper powder (Conductive powder 1).
- the 50% value (D 50 ) in the volume-based integrated fraction was determined using a laser diffraction particle size distribution analyzer.
- the number average particle diameter (D 50 ) and aspect ratio of 50 arbitrarily selected powders were measured in SEM (scanning electron microscope) image observation, and the average value was asked.
- the specific surface area was measured by the BET method.
- spherical silver powder (conductive powder 4) was prepared based on the spray pyrolysis method described in Japanese Patent Publication No. 63-31522. Specifically, for the spherical silver powder, an aqueous solution in which a silver salt was dissolved was subjected to spray pyrolysis, and the collected silver powder was classified to adjust the D50 value. For the obtained silver powder, the 50% value (D 50 ) in the integrated fraction based on volume was determined using a laser diffraction particle size distribution analyzer. Moreover, the specific surface area was measured by the BET method.
- a spherical silver powder was produced by the method described above, and the obtained spherical silver powder was pulverized in a ball mill using stearic acid as a lubricant to produce flaky silver powder (conductive powder 3).
- the number average particle diameter (D 50 ) and aspect ratio of 50 randomly selected silver powders were measured in SEM image observation, and the average value was obtained.
- the specific surface area was measured by the BET method.
- ⁇ Preparation of conductive resin composition A conductive powder and a binder component were blended at the blending ratio shown in Table 1 to prepare a conductive resin composition.
- surface is a mass part.
- ⁇ Conductive powder 1 Flake-shaped silver-coated copper powder, aspect ratio: 20, D 50 : 8.0 ⁇ m, specific surface area: 1.5 m 2 /g ⁇ Conductive powder 2 Spherical silver-coated copper powder, D50 : 4.0 ⁇ m, specific surface area: 0.5 m2 /g ⁇ Conductive powder 3 Flake-like silver powder, aspect ratio: 30, D 50 : 6.0 ⁇ m, specific surface area: 1.0 m 2 /g ⁇ Conductive powder 4 Spherical silver powder, D50 : 2.3 ⁇ m, specific surface area: 0.5 m2 /g ⁇ Silicone resin 1 Thermosetting silicone resin having hydroxyl group, dehydration condensation type, manufactured by Shin-Etsu Chemical Co., Ltd., model number: ES-1001N, other functional groups: epoxy group/silicone resin 2 Thermosetting silicone resin having hydroxyl group, dehydration condensation type, manufactured by Shin-Etsu Chemical Co., Ltd., model number: K
- Example 1 After mixing silicone resin 1, epoxy resin 1, polyvinyl acetal resin 1 (butyral resin), conductive powder 1, and benzyl alcohol at the ratio shown in Table 1, use a three-roll mill (manufactured by Inoue Seisakusho). and kneaded to obtain a paste-like composition.
- Example 2 Comparative Example 1, Comparative Example 2
- silicone resin 2 silicone oil 1, or liquid silicone rubber 1 was used instead of silicone resin 1.
- Example 3 Silicone resin 1, conductive powder 1, and benzyl alcohol were mixed at the ratio shown in Table 1, and kneaded using a three-roll mill (manufactured by Inoue Seisakusho) to obtain a paste composition.
- Examples 4-12, Comparative Examples 3-5 The components shown in Table 1 were mixed at the ratios shown in Table 1, and kneaded using a three-roll mill (manufactured by Inoue Seisakusho) to obtain a paste-like composition.
- ⁇ Performance evaluation> moisture permeability
- the conductive resin composition was cast on a PET film to a thickness of 250 ⁇ m and cured at 200° C. for 60 minutes to obtain a cured film.
- the resulting cured film was cut into a circle with a diameter of 7.5 mm, and fixed with an adhesive so as to cover a 5 ml glass bottle containing 2 g of silica gel.
- the glass bottle was placed in a 750 ml container containing 100 ml of purified water so that the cured film did not come into contact with the purified water, and the container was placed in a dryer set at 65° C. and allowed to stand for 15 hours.
- the weight of the glass bottle before and after being placed in the dryer was measured, and the weight increase was defined as the moisture permeability.
- the conductive resin composition was cast on a slide glass substrate to have a width of 1 cm, a length of 5 cm and a thickness of 50 ⁇ m, and cured at 200° C. for 60 minutes to obtain a cured film.
- a digital multimeter Karl Fischer Instruments, KEITHLEY2002
- the resistance of the surface of the cured film was measured by the four-probe method, and the specific resistance was calculated from the obtained value and the thickness of the sample.
- the conductive resin composition was cast on a PET film to a thickness of 250 ⁇ m and cured at 200° C. for 60 minutes to obtain a cured film.
- the resulting cured film was cut into a rectangle with a short side (width) of 5 mm and a long side of 20 mm, and then measured with a viscoelasticity measuring device (manufactured by Hitachi High-Tech Science Co., model number: DMA-7100).
- the cured film was set on the viscoelasticity measuring device by sandwiching the upper and lower sides (both ends in the longitudinal direction) of the cured film so that the length of the cured film was 10 mm.
- the coating film length was measured when a tensile load of 9.8 N was applied in the longitudinal direction.
- the ratio of the length stretched when the load was applied to the length of 10 mm of the portion to which the load was applied before the load was applied was calculated as the elongation rate.
- the flatness of the end face portion and the thickness and continuity of the corner portion were comprehensively evaluated (four-grade evaluation), and a score of 2 or higher was regarded as acceptable (usable). If the end surface is flat and the corner portion has a sufficient thickness and there is no discontinuity, the score is "4, usable, excellent shape", and the end surface is convex or the corner is Those that were discontinuous and had exposed copper terminals were rated as "grade 1, unusable, poor shape".
- the silicone resin content A is the content of the thermosetting silicone resin having hydroxyl groups in the binder resin
- the silicone resin content B is the thermosetting silicone resin having hydroxyl groups in the cured film-forming component. is the content of the soluble silicone resin.
- Examples 1 to 3 and Comparative Example 1 had lower moisture permeability than Comparative Examples 2 and 3.
- Examples 1 to 3 and Comparative Example 3 had lower specific resistance than Comparative Examples 1 and 2. That is, since Examples 1 to 3 have a small amount of moisture permeation and a low specific resistance, both moisture resistance and conductivity are better than when the conductive resin compositions of Comparative Examples 1 to 3 are used. It was found that excellent electronic parts can be manufactured.
- Examples 1 and 2 had a higher elongation rate than Example 3 while maintaining a low moisture permeability. That is, it was found that, in Examples 1 and 2, it is possible to manufacture electronic components with higher impact resistance than in the case of using the conductive resin composition of Example 3.
- Examples 4 to 12 similarly to Examples 1 to 3, it was found that an electronic component having low moisture permeability and low specific resistance and excellent in both moisture resistance and conductivity could be produced.
- Comparative Examples 4 and 5 had high moisture permeability.
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Abstract
Description
<透湿量測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させ、得られた硬化膜を直径7.5mmの円形に切り出し、シリカゲル2gが入った5mlガラス瓶に蓋をするように接着剤で固定し、精製水を100ml入れた750ml容器内に前記硬化膜が精製水に接触しないように該ガラス瓶を入れ密閉した状態で、65℃に設定した乾燥機に入れて15時間静置し、次いで、下記式(1):
透湿量(重量増加量)=乾燥機に入れた後のガラス瓶の重量-乾燥機に入れる前のガラス瓶の重量(1)
により、透湿量を算出する。
<伸び率測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させ、得られた硬化膜を幅5mmの長方形に切り出し、粘弾性測定装置を用いて長軸方向に9.8Nの引張り荷重をかけたときの塗膜長さを測定し、次いで、下記式(2):
伸び率(%)=(荷重をかけたときに伸張した長さ/荷重をかける前の長さ)×100 (2)
により、伸び率を算出する。
該電子部品用被電極形成体の外表面上に、電極を形成させる電極形成工程と、
を有し、
該電極形成工程において、電子部品用被電極形成体に、(1)~(7)のいずれかの熱硬化型導電性樹脂組成物を塗布し、次いで、該熱硬化型導電性樹脂組成物を硬化させることにより、該電子部品用被電極形成体に導電性樹脂層を形成させること、
を特徴とする電子部品の製造方法を提供するものである。
<透湿量測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させ、得られた硬化膜を直径7.5mmの円形に切り出し、シリカゲル2gが入った5mlガラス瓶に蓋をするように接着剤で固定し、精製水を100ml入れた750ml容器内に前記硬化膜が精製水に接触しないように該ガラス瓶を入れ密閉した状態で、65℃に設定した乾燥機に入れて15時間静置し、次いで、下記式(1):
透湿量(重量増加量)=乾燥機に入れた後のガラス瓶の重量-乾燥機に入れる前のガラス瓶の重量 (1)
により、透湿量を算出する。
<比抵抗測定試験>
導電性樹脂組成物をスライドガラス基板上に幅1cm、長さ5cm、厚さ50μmでキャスティングし、200℃、60分の条件で硬化させて硬化膜を得た後、デジタルマルチメータ(例えば、Keithley Instruments社製、KEITHLEY2002)を用いて4端子法により硬化膜表面の抵抗を測定し、得られた値と試料厚さから比抵抗を算出する。
<伸び率測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させることで得られる硬化膜を、短辺(幅)5mm、長辺20mmの長方形に切り出し、次いで、粘弾性測定装置(日立ハイテクサイエンス社製、型番:DMA-7100)に、荷重がかかる部分の長さが10mmとなるように、該硬化膜の上下(長軸方向の両端)を挟み込んで、該粘弾性測定装置に該硬化膜をセットし、該粘弾性測定装置を用いて、硬化膜の長軸方向に9.8Nの引張り荷重をかけたときの塗膜長さを測定し、次いで、下記式(2):
伸び率(%)=(荷重をかけたときに伸張した長さ/荷重をかける前の長さ(10mm))×100 (2)
により、伸び率を算出する。
<密着強度測定試験>
導電性樹脂組成物をスライドガラス基板上に厚さ50μmでキャスティングし直径3mmのアルミシリンダーをのせて、200℃、60分の条件で硬化させ、ボンドテスター(西進商事社製、型番:SS-30WD)を用いて0.5mm/sの速さで垂直方向に引張り、破断したときの値を計測することにより測定される。
球状の銅粉末(三井金属製、型番:MA-CO3K)90質量部に対して10質量部の比率となるように銀で被覆した銀コート銅粉末を製造し、得られた球状銀コート銅粉末(導電性粉末2)を、滑剤としてパルミチン酸を用いてボールミルで粉砕してフレーク状銀コート銅粉末(導電性粉末1)を製造した。得られた球状銀コート銅粉末について、レーザー回折式粒度分布測定装置を用いて、体積基準の積算分率における50%値(D50)を求めた。また、得られたフレーク状銀コート銅粉末について、SEM(走査電子顕微鏡)像観察において任意に選んだ50個の粉末の数平均粒子径(D50)及びアスペクト比を測定し、その平均値を求めた。また、BET法により比表面積を測定した。
先ず、特公昭63-31522号に記載されている噴霧熱分解法に基づいて、球状銀粉末(導電性粉末4)を準備した。すなわち、球状銀粉末については、銀塩を溶解させた水溶液を噴霧熱分解し、捕集した銀粉末を分級処理して、D50の値を調節した。なお、得られた銀粉末について、レーザー回折式粒度分布測定装置を用いて、体積基準の積算分率における50%値(D50)を求めた。また、BET法により比表面積を測定した。
前述の方法で球状銀粉末を製造し、得られた球状銀粉末を、滑剤としてステアリン酸を用いてボールミルで粉砕してフレーク状銀粉末(導電性粉末3)を製造した。SEM像観察において任意に選んだ50個の銀粉末の数平均粒子径(D50)及びアスペクト比を測定し、その平均値を求めた。また、BET法により比表面積を測定した。
表1に示す配合割合で、導電性粉末とバインダー成分を配合し、導電性樹脂組成物を調製した。なお、表中に配合量として示した数値の単位は質量部である。
・導電性粉末1
フレーク状銀コート銅粉末、アスペクト比:20、D50:8.0μm、比表面積:1.5m2/g
・導電性粉末2
球状銀コート銅粉末、D50:4.0μm、比表面積:0.5m2/g
・導電性粉末3
フレーク状銀粉末、アスペクト比:30、D50:6.0μm、比表面積:1.0m2/g
・導電性粉末4
球状銀粉末、D50:2.3μm、比表面積:0.5m2/g
・シリコーン樹脂1
水酸基を有する熱硬化性シリコーン樹脂、脱水縮合型、信越化学工業社製、型番:ES-1001N、その他の官能基:エポキシ基
・シリコーン樹脂2
水酸基を有する熱硬化性シリコーン樹脂、脱水縮合型、信越化学工業社製、型番:KR-282、その他の官能基:メチル基、フェニル基
・シリコーン樹脂3
水酸基を有さない熱硬化性シリコーン樹脂、付加硬化型、信越化学工業社製、型番:X-40-2756(硬化触媒を含有する一液タイプ)、その他の官能基:アルケニル基、メチル基、フェニル基
・シリコーンオイル1
シリコーンオイル、信越化学工業社製、型番:X-22-169AS、その他の官能基:エポキシ基(脂環式)
・液状シリコーンゴム1
シリコーンゴム、湿気硬化型、信越化学工業社製、型番:KE-3491
・エポキシ樹脂1
熱硬化性エポキシ樹脂、DIC社製、型番:EXA4816
・ポリビニルアセタール樹脂1
ポリビニルアセタール樹脂(ポリビニルブチラール樹脂あるいはブチラール樹脂とも称する)、熱可塑性、積水化学工業社製、型番:KS-10
・ポリアミド樹脂1
ポリアミド樹脂、熱可塑性、T&K TOKA社製、型番:PA-201
・エチルセルロース樹脂1
エチルセルロース樹脂、熱可塑性、ダウ・ケミカル社製、型番:ETHOCEL Standard45
なお、以下表中の樹脂の量は、溶剤を除く樹脂自体の量を指す。
シリコーン樹脂1と、エポキシ樹脂1と、ポリビニルアセタール樹脂1(ブチラール樹脂)と、導電性粉末1と、ベンジルアルコールとを、表1に記載の比率で混合後、三本ロールミル(井上製作所製)用いて混錬し、ペースト状の組成物を得た。
シリコーン樹脂1の代わりにシリコーン樹脂2、シリコーンオイル1又は液状シリコーンゴム1を用いた以外は、実施例1と同様の方法を用いてペースト状の組成物を得た。
シリコーン樹脂1と、導電性粉末1と、ベンジルアルコールとを、表1に記載の比率で混合後、三本ロールミル(井上製作所製)用いて混錬し、ペースト状の組成物を得た。
表1に記載する成分を、表1に記載の比率で混合後、三本ロールミル(井上製作所製)用いて混錬し、ペースト状の組成物を得た。
(透湿量)
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させて硬化膜を得た。得られた硬化膜を直径7.5mmの円形に切り出し、シリカゲル2gが入った5mlガラス瓶に蓋をするように接着剤で固定した。その後、精製水を100ml入れた750ml容器内に前記硬化膜が精製水に接触しないように上記ガラス瓶を入れ密閉した状態で、65℃に設定した乾燥機に入れて15時間静置した。乾燥機に入れる前と入れた後のガラス瓶の重量を測定し、重量増加分を透湿量とした。
導電性樹脂組成物をスライドガラス基板上に幅1cm、長さ5cm、厚さ50μmでキャスティングし、200℃、60分の条件で硬化させて硬化膜を得た。デジタルマルチメータ(Keithley Instruments社製、KEITHLEY2002)を用いて4端子法により硬化膜表面の抵抗を測定し、得られた値と試料厚さから比抵抗を算出した。
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させて硬化膜を得た。得られた硬化膜を短辺(幅)5mm、長辺20mmの長方形に切り出し、次いで、粘弾性測定装置(日立ハイテクサイエンス社製、型番:DMA-7100)に、荷重がかかる部分の長さが10mmとなるように、該硬化膜の上下(長軸方向の両端)を挟み込んで、該粘弾性測定装置に該硬化膜をセットした。次いで、該粘弾性測定装置を用いて長軸方向に9.8Nの引張り荷重をかけたときの塗膜長さを測定した。荷重をかける前の荷重がかかる部分の長さ10mmに対する、荷重をかけたときに伸張した長さの比率を算出し、伸び率とした。
縦3.2mm、横2.5mm、高さ2.5mmの、略直方体の、チタン酸バリウムを含む誘電体層とニッケルを含む内部電極層が複数層積層された積層体の両端面に銅端子が形成された、銅端子を備える積層体に、ディップ法により、表1に記載の導電性樹脂組成物を塗布し、大気雰囲気、200℃の条件で60分間保持することで塗布した導電性樹脂組成物を硬化させ、前述の銅端子上に導電性樹脂層を形成することで積層型電子部品を得た。得られた電子部品の断面を走査型電子顕微鏡で観察し、前述の導電性樹脂層の形状を評価した。すなわち、端面部の平坦性とコーナー部の厚みや連続性を総合評価し(4段階評価)、評点2以上を合格(使用可)とした。なお、端面部が平坦であり且つコーナー部に充分な厚みが見られ不連続部分がないものを「評点4、使用可、極めて優れた形状」とし、端面部が凸形状である又はコーナー部が不連続であり銅端子が露出しているものを「評点1、使用不可、形状不良」とした。
Claims (8)
- 導電性粉末と、樹脂バインダーと、を含有する熱硬化型導電性樹脂組成物であって、
前記導電性粉末がフレーク状導電性粉末を含み、
前記樹脂バインダーが水酸基を有する熱硬化性シリコーン樹脂を含み、
前記樹脂バインダーのうちの25.0質量%以上が前記水酸基を有する熱硬化性シリコーン樹脂である、
熱硬化型導電性樹脂組成物。 - 前記熱硬化型導電性樹脂組成物を加熱することによって得られる導電性樹脂層を形成する成分のうちの4.0質量%以上が前記水酸基を有する熱硬化性シリコーン樹脂である請求項1に記載の熱硬化型導電性樹脂組成物。
- 前記樹脂バインダーのうちの70.0質量%以下が前記水酸基を有する熱硬化性シリコーン樹脂である請求項1に記載の熱硬化型導電性樹脂組成物。
- 前記樹脂バインダーが、更に、熱可塑性樹脂を含む、請求項1に記載の熱硬化型導電性樹脂組成物。
- 前記樹脂バインダーが、更に、セルロース系樹脂、アセタール系樹脂、ポリアミド樹脂、エポキシ樹脂、アクリル樹脂及び(メタ)アクリル樹脂、からなる群から選択される1種以上を含む請求項1に記載の熱硬化型導電性樹脂組成物。
- 下記透湿量測定試験により求められる透湿量が80.0mg以下である請求項1~5のいずれか一項に記載の熱硬化型導電性樹脂組成物。
<透湿量測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させ、得られた硬化膜を直径7.5mmの円形に切り出し、シリカゲル2gが入った5mlガラス瓶に蓋をするように接着剤で固定し、精製水を100ml入れた750ml容器内に前記硬化膜が精製水に接触しないように該ガラス瓶を入れ密閉した状態で、65℃に設定した乾燥機に入れて15時間静置し、次いで、下記式(1):
透湿量(重量増加量)=乾燥機に入れた後のガラス瓶の重量-乾燥機に入れる前のガラス瓶の重量 (1)
により、透湿量を算出する。 - 下記伸び率測定試験により求められる伸び率が0.40%以上である請求項1~5のいずれか一項に記載の熱硬化型導電性樹脂組成物。
<伸び率測定試験>
導電性樹脂組成物をPETフィルム上に厚さ250μmでキャスティングし、200℃、60分の条件で硬化させ、得られた硬化膜を、幅5mmの長方形に切り出し、粘弾性測定装置を用いて長軸方向に9.8Nの引張り荷重をかけたときの塗膜長さを測定し、次いで、下記式(2):
伸び率(%)=(荷重をかけたときに伸張した長さ/荷重をかける前の長さ)×100 (2)
により、伸び率を算出する。 - 電子部品用被電極形成体を準備する準備工程と、
該電子部品用被電極形成体の外表面上に、電極を形成させる電極形成工程と、
を有し、
該電極形成工程において、電子部品用被電極形成体に、請求項1~7のいずれか一項に記載の熱硬化型導電性樹脂組成物を塗布し、次いで、該熱硬化型導電性樹脂組成物を硬化させることにより、該電子部品用被電極形成体に導電性樹脂層を形成させること、
を特徴とする電子部品の製造方法。
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| US18/707,018 US20250066579A1 (en) | 2021-11-02 | 2022-10-26 | Thermosetting conductive resin composition and method for producing electronic component |
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| US20250066579A1 (en) | 2025-02-27 |
| TW202328343A (zh) | 2023-07-16 |
| EP4428197A1 (en) | 2024-09-11 |
| CN118176260A (zh) | 2024-06-11 |
| EP4428197A4 (en) | 2025-10-29 |
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