WO2023067911A1 - 導電性硬化物 - Google Patents
導電性硬化物 Download PDFInfo
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- WO2023067911A1 WO2023067911A1 PCT/JP2022/032964 JP2022032964W WO2023067911A1 WO 2023067911 A1 WO2023067911 A1 WO 2023067911A1 JP 2022032964 W JP2022032964 W JP 2022032964W WO 2023067911 A1 WO2023067911 A1 WO 2023067911A1
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- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
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- C08G18/80—Masked polyisocyanates
- C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/06—Polyurethanes from polyesters
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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
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- 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
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
Definitions
- the present invention relates to a flexible conductive cured material for bonding electronic parts and electronic equipment.
- FHE flexible hybrid electronics
- Flexible base materials for FHE are inferior in heat resistance to base materials used in existing electronic devices, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP), and polyurethane (PU).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PP polypropylene
- PU polyurethane
- a substrate may be used. Therefore, a conductive adhesive for joining parts is also required to adhere at a low temperature according to the heat resistance of the base material.
- Patent Document 1 silver powder and/or silver powder and/or silver powder and/or silver powder and/or silver powder are added to a liquid epoxy resin and a liquid phenoxy resin for the purpose of providing a conductive adhesive with excellent conductivity and adhesive strength that is suppressed in thickening at room temperature.
- a technique is disclosed in which a latent glutaric acid-generating compound is added in a fixed amount in combination with a silver-coated metal powder.
- Patent Document 2 a main chain having a repeating unit represented by the formula: —R 1 —O— (wherein R 1 is a hydrocarbon group having 1 to 10 carbon atoms) and a hydrolyzable silyl group
- R 1 is a hydrocarbon group having 1 to 10 carbon atoms
- R 2 is a hydrocarbon group having 1 to 10 carbon atoms
- a technology of a conductive adhesive having good flexibility and high conductivity is disclosed by combining a polyether polymer having a certain terminal group and silver particles.
- Patent Document 3 by combining a polyol, a blocked isocyanate, and a conductive filler having an aspect ratio of 2 or more, a conductive composition that has excellent tackiness before curing and maintains a small change in resistance during stretching after curing. has been disclosed.
- Patent Document 4 a conductive metal having a metal oxide and a lubricant on the surface reacts with an isocyanate component during heat curing, so that the metal oxide and the lubricant are at least partially removed from the conductive metal surface.
- Techniques have been disclosed for increasing the conductivity of conductive compositions by being removed.
- Japanese Patent No. 5200662 JP 2018-48286 A Japanese Patent Application Laid-Open No. 2020-150236 Japanese Patent No. 4467439
- the conductive adhesive used in ordinary electronic devices is excellent in adhesive strength and conductivity, but has a problem of lacking in flexibility.
- the conductive adhesive described in Patent Document 2 is excellent in flexibility and specific resistance, but has a problem of high curing temperature.
- the conductive adhesives using blocked isocyanate as a curing agent described in Patent Documents 3 and 4 can be cured at a low temperature and have excellent conductivity, but their flexibility and adhesiveness have not been sufficiently studied. .
- the inventor of the present invention has made intensive research to develop a conductive cured product for bonding electronic parts that is flexible and has excellent conductivity even at a low curing temperature, so that cracks do not occur during deformation and resistance change is small. As a result, it is characterized by containing a resin having a urethane bond and conductive particles, and the storage elastic modulus of the cured product at 25 ° C. is 50 MPa or more and 1000 MPa or less, and the specific resistance is 2.0 ⁇ 10 -4 ⁇ ⁇
- the present inventors have found that a cured product having excellent conductivity and flexibility that can follow deformation can be obtained by setting the thickness to less than 1 cm, and arrived at the following invention.
- the present invention has the following configurations.
- a cured product of a conductive composition wherein the cured product contains a resin having a urethane bond and conductive particles, the cured product has a storage modulus at 25° C. of 50 MPa or more and 1000 MPa or less, and A conductive cured product for bonding electronic parts, characterized by having a specific resistance of less than 2.0 ⁇ 10 ⁇ 4 ⁇ cm.
- An electronic device comprising a substrate having wiring and an electronic component, wherein the conductive cured product according to any one of [1] to [6] is interposed between the electronic component and the wiring.
- the substrate is an extendable and/or bendable substrate.
- the conductive cured product contains a resin having a urethane bond and conductive particles
- the storage elastic modulus at 25 ° C. of the conductive cured product is 50 MPa or more and 1000 MPa or less
- the specific resistance is 2 It is characterized by being less than 0 ⁇ 10 ⁇ 4 ⁇ cm.
- FIG. 1 is a schematic diagram showing a cross section of an electronic device using the conductive cured product of the present invention.
- FIG. 2 is a diagram showing the procedure for producing a mounting body using the conductive cured product of the present invention.
- FIG. 2(a) is a diagram in which the wiring 20 is formed on the substrate 10
- FIG. 2(b) is a diagram in which the conductive composition is applied to both ends of the wiring 20 on the gap side
- FIG. ) shows the LED chip mounted on the conductive composition and the conductive composition cured.
- FIG. 3 is a cross-sectional view of a tensile tester for a package using the conductive cured product of the present invention.
- the conductive cured product according to this embodiment is a cured product of a conductive composition.
- the conductive cured product (hereinafter also simply referred to as cured product) is a cured product containing at least a resin having a urethane bond and conductive particles, and a binder resin having a urethane bond and conductive particles.
- the cured product preferably further contains a resin having a urea bond, more preferably a binder resin having a urea bond.
- the cured product may contain a resin having a urethane bond and a resin having a urea bond, or the same resin may contain both a urethane bond and a urea bond.
- the conductive composition in the present invention is not particularly limited, and preferably contains, for example, polyol and isocyanate or blocked isocyanate. That is, examples of conductive cured products include a reaction product of polyol and isocyanate, a reaction product of polyol and blocked isocyanate, and the like. From the viewpoint of handling of the conductive composition before curing, it is preferably a reaction product of polyol and blocked isocyanate. It is also preferred that the conductive composition further contains a polyamine. By containing a polyamine, the conductive cured product can contain a urea bond (resin having a urea bond).
- polyols in the present invention include polyether polyols, polyester polyols, polycarbonate polyols, polyurethane polyols, polybutadiene polyols, polyisoprene polyols, polycaprolactone polyols, and castor oil-based polyols. These may be used individually by 1 type, and may be used in combination of 2 or more types.
- polyether polyols examples include aromatic polyether polyols, aromatic/aliphatic copolymer polyether polyols, aliphatic polyether polyols, and alicyclic polyether polyols.
- polyester polyols examples include aromatic polyester polyols, aromatic/aliphatic copolymer polyester polyols, aliphatic polyester polyols, and alicyclic polyester polyols. Among these, aliphatic polyester polyols are preferred from the viewpoint of flexibility. Specific examples of commercially available aliphatic polyester polyols include ODX-2420, ODX-2692 (manufactured by DIC Corporation), Kuraray Polyol P-510, P-1010, P-2050 (manufactured by Kuraray Co., Ltd.), and NIPPOLAN. 4009, 164, 141 (manufactured by Tosoh Corporation) and the like.
- polycarbonate polyols examples include aromatic polycarbonate polyols, aromatic/aliphatic copolymerized polycarbonate polyols, aliphatic polycarbonate polyols, and alicyclic polycarbonate polyols.
- polyurethane polyols examples include aromatic polyurethane polyols, aromatic/aliphatic copolymerized polyurethane polyols, aliphatic polyurethane polyols, and alicyclic polyurethane polyols.
- polyester polyol is preferable because it is easy to improve curability and conductivity. It is also preferable to combine a polyester polyol with a polyol other than polyester polyol.
- the proportion of the polyester polyol in the polyol is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, particularly preferably 95% by mass or more, and most preferably 98% by mass or more, Alternatively, it may be 100% by mass.
- the active hydrogen equivalent of the polyol is preferably 180 g/eq or more, more preferably 220 g/eq or more, from the viewpoint of the flexibility of the cured product. Moreover, from the viewpoint of adhesion and conductivity of the cured product, it is preferably 1200 g/eq or less, more preferably 600 g/eq or less. By setting it to the said range, the balance of the flexibility of hardened
- the method for measuring the active hydrogen equivalent of the polyol is according to the method described in Examples.
- the hydroxyl value of the polyol is not particularly limited, it is preferably 50 to 300 KOHmg/g, more preferably 100 to 250 KOHmg/g, from the viewpoint of improving conductivity and adhesiveness.
- the weight average molecular weight of the polyol is not particularly limited, it is preferably 400 to 2000 g/mol, more preferably 450 to 1500 g/mol, from the viewpoint of improving conductivity and adhesiveness.
- compounds having one hydroxyl group include aliphatic saturated alcohols such as 1-pentanol, octanol and cyclohexaneethanol; aliphatic unsaturated alcohols such as 10-undecen-1-ol; 2-phenylethyl alcohol and benzyl alcohol. aromatic alcohols; and derivatives and modified products thereof.
- the content of the compound having one hydroxyl group is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, still more preferably 3 parts by mass or less with respect to 100 parts by mass of the polyol, and 0 parts by mass. may be
- the elastic modulus of the cured product is increased and the adhesiveness is further improved.
- the cured product having a urea bond used in the present invention includes a reaction product of polyamine and isocyanate, a reaction product of polyamine and blocked isocyanate, and the like. From the viewpoint of handling the composition before curing, the cured product containing urea bonds is preferably a reaction product of polyamine and blocked isocyanate.
- polyamines examples include aliphatic polyamines such as linear aliphatic polyamines, cycloaliphatic polyamines, and araliphatic polyamines, alicyclic polyamines, aromatic polyamines, and derivatives and modified products thereof. These may be used individually by 1 type, and may be used in combination of 2 or more types.
- the derivatives include alkyl derivatives of polyamines, and examples of modified products include epoxy adducts of polyamines, Mannich reaction products, Michael reaction products, thiourea reaction products, polymerized fatty acid and/or carboxylic acid reaction products. polyamidoamine and the like.
- the aliphatic polyamine is a compound in which at least one amino group is bonded to a chain aliphatic hydrocarbon having 1 or more carbon atoms (excluding compounds having a structure in which an amino group is directly bonded to an aromatic ring).
- An aliphatic ring or an aromatic ring may be bonded to the chain aliphatic hydrocarbon.
- a compound in which an amino group and an aliphatic ring are bonded to a chain aliphatic hydrocarbon is particularly referred to as a cycloaliphatic polyamine, and a compound in which an amino group and an aromatic ring are bonded to a chain aliphatic hydrocarbon is particularly aromatic. They are called cycloaliphatic polyamines.
- Specific examples of aliphatic polyamines include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, norbornanediamine, m-xylenediamine, and isophoronediamine.
- the alicyclic polyamine is a compound in which all amino groups are directly bonded to an alicyclic ring, and specific examples include cyclohexanediamine.
- the aromatic polyamine is a compound in which at least one amino group is directly bonded to an aromatic ring. methylpropyl)aniline], aminobenzylamine and the like.
- aliphatic polyamines or modified products thereof are preferred because they tend to improve flexibility.
- Specific examples of commercial products of aliphatic polyamines or modified products thereof include Fujicure FXJ-8027-H, FXJ-859-C, FXD-821-F, Tomide 280-C, TXE-524 (T&K TOKA Co., Ltd. ), Jeffamine D-400 (manufactured by Tomoe Kogyo Co., Ltd.), jercure FL11, SA1 (manufactured by Mitsubishi Chemical Corporation) and the like. It is also preferable to combine an aliphatic polyamine or its modified form with a polyamine other than the aliphatic polyamine or its modified form.
- the proportion of the aliphatic polyamine or modified product thereof in the polyamine is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, particularly preferably 95% by mass or more, and most preferably 98% by mass. % or more, and may be 100% by mass.
- the active hydrogen equivalent of polyamine is preferably 80 g/eq or more, more preferably 85 g/eq or more, from the viewpoint of compatibility between flexibility, adhesiveness, and conductivity. Moreover, from the viewpoint of availability and improvement of adhesiveness, it is preferably 200 g/eq or less, more preferably 190 g/eq or less.
- the active hydrogen equivalent of the polyamine is preferably 80-200 g/eq, more preferably 85-190 g/eq.
- the method for measuring the active hydrogen equivalent of polyamine is according to the method described in Examples.
- the amine value of the polyamine is not particularly limited, it is preferably 150 to 350 KOHmg/g, more preferably 160 to 330 KOHmg/g. When the amine value is within this range, the viscosity increase of the conductive composition is suppressed, making handling easier.
- the viscosity of the polyamine is not particularly limited, it is preferably 2000 mPa ⁇ s or less, more preferably 800 mPa ⁇ s or less, from the viewpoint of easier handling.
- the IR peak area ratio (urethane bond/urea bond) of the urethane bond and urea bond in the conductive cured product is preferably 7/3 to 1/9, more preferably 6/4 to 2/8. preferable.
- the active hydrogen equivalent of the polyamine that forms a urea bond by reacting with isocyanate is 180 g/eq or less
- the mixing ratio polyol/ Polyamine
- the mixing ratio preferably has an active hydrogen equivalent ratio of 4/6 to 7/3, more preferably 5/5 to 7/3.
- the method for calculating the IR peak area ratio is according to the method described in Examples.
- the total content of polyols and polyamines for forming urethane bonds and urea bonds in the present invention is not particularly limited, it is preferably 1% by mass or more and 50% by mass or less with respect to the total amount of the conductive composition. It is more preferably 2% by mass or more and 30% by mass or less, and most preferably 3% by mass or more and 15% by mass or less.
- the conductive composition of the present invention preferably contains an isocyanate compound or a blocked isocyanate compound.
- the isocyanate constituting the blocked isocyanate compound is preferably a compound (polyisocyanate) having a plurality of isocyanate groups in the molecule.
- polyisocyanate examples include aliphatic polyisocyanates such as hexamethylene diisocyanate (hereinafter referred to as HDI) and isophorone diisocyanate (IPDI); aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI); Modified isocyanates such as isocyanurates, adducts, and biurets of isocyanates can be mentioned, and aliphatic polyisocyanates or modified aliphatic polyisocyanates are preferred from the viewpoint of improving flexibility.
- aliphatic polyisocyanates such as hexamethylene diisocyanate (hereinafter referred to as HDI) and isophorone diisocyanate (IPDI)
- aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI)
- Modified isocyanates such as is
- Each isocyanate may be a monomer, but is preferably a polymer of each isocyanate or a modified product such as an isocyanurate, an adduct, or a biuret of the polymer.
- the most preferred isocyanate is an aliphatic polyisocyanate polymer such as an HDI polymer, or a modified product thereof.
- the blocking agent that constitutes the blocked isocyanate compound examples include phenol-based, oxime-based, alcohol-based, lactam-based, active methylene-based, and pyrazole-based blocking agents.
- active methylene-based blocking agents and pyrazole-based blocking agents are preferable in that the reaction temperature can be lowered.
- the blocking agent may contain one kind alone, or may contain two or more kinds. From the viewpoint of curability and storage stability, it is preferable to contain both active methylene-based and pyrazole-based blocking agents.
- Examples of the active methylene-based blocking agents include dialkyl malonates such as dimethyl malonate, diethyl malonate, dibutyl malonate, 2-ethylhexyl malonate, methylbutyl malonate, diethylhexyl malonate, and diphenyl malonate. .
- pyrazole-based blocking agents examples include pyrazole, 3,5-dimethylpyrazole, 3-methylpyrazole, 4-nitro-3,5-dimethylpyrazole, and the like.
- blocked isocyanate compounds include Duranate SBN-70D, SBB-70P, TPA-B80E (manufactured by Asahi Kasei Corporation), Desmodur BL3272MPA, BL3475BA/SN, BL3575MPA/SN (manufactured by Covestro), Trixene BI7960, BI7982, BI7991. , BI7992 (manufactured by Baxenden) and the like.
- the compounding ratio (NCO group/active hydrogen group) of all the active hydrogen groups possessed by the polyol and polyamine in the present invention and the isocyanate group of the blocked isocyanate is not particularly limited, but is preferably 0.7 or more and less than 2.0. It is preferably 0.8 or more and 1.5 or less. Within this range, better adhesiveness can be exhibited while maintaining the flexibility of the cured product.
- the conductive composition in the present invention can further contain a catalyst within a range that does not impair its performance.
- the catalyst is not particularly limited, examples thereof include organic tin compounds, organic bismuth metal compounds, tertiary amine compounds and the like.
- the content of the catalyst is preferably 1.0% by mass or less, more preferably 0.1% by mass or less, relative to the total amount of the conductive composition.
- the conductive particles used in the present invention are not particularly limited, but include silver, copper, gold, platinum, palladium, aluminum, nickel, indium, bismuth, zinc, lead, tin, carbon black, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types. Among these, silver particles are preferably used from the viewpoint of conductivity.
- the average particle size D50 of the conductive particles is not particularly limited, but the average particle size D50 is preferably 0.4 ⁇ m or more and 15 ⁇ m or less.
- D50 is 0.4 ⁇ m or more, the flexibility of the cured product is improved, the elastic modulus of the cured product does not become too high, and cracks are less likely to occur during deformation. Therefore, it is more preferably 0.5 ⁇ m or more, and still more preferably 0.6 ⁇ m or more.
- D50 is 15 ⁇ m or less, adhesive strength and electrical conductivity are improved. Therefore, it is more preferably 12 ⁇ m or less, and still more preferably 10 ⁇ m or less.
- the conductive composition of the present invention may contain a single type of conductive particles having a single average particle size D50, or may contain two or more types of conductive particles having different average particle sizes D50. good too.
- the average particle size D50 is preferably less than 4.9 ⁇ m, more preferably 4.5 ⁇ m or less.
- the average particle diameter D50 of the small-diameter conductive particles is not particularly limited, it is preferably 0.4 ⁇ m or more, more preferably 0.5 ⁇ m or more, and still more preferably 0.6 ⁇ m or more.
- the average particle diameter D50 of the large-diameter conductive particles is not particularly limited, but is preferably 5 ⁇ m or more, more preferably 6 ⁇ m or more, and still more preferably 7 ⁇ m or more. Also, it is preferably 15 ⁇ m or less, more preferably 12 ⁇ m or less, and even more preferably 10 ⁇ m or less.
- the blending ratio of small particle size and large particle size conductive particles is not particularly limited, but is preferably 95/5 to 50/50, more preferably 90/10 to 70. /30 is more preferred. By setting the blending ratio of the small-diameter and large-diameter conductive particles within this range, it is possible to obtain a more flexible cured product while maintaining the conductivity and adhesiveness.
- the shape of the conductive particles is not particularly limited, it may be scaly (also referred to as flake), irregularly aggregated, spherical, massive, or the like.
- the shape of the conductive particles may contain one type alone, or may contain two or more types. Among them, from the viewpoint of preventing viscosity reduction during heating, it is preferable to include at least a scaly shape.
- the average particle diameter D50 in the present invention indicates the particle diameter at 50% of the cumulative volume basis of the particle diameter measured by the laser diffraction method.
- the total content of the conductive particles in the conductive cured product of the present invention is not particularly limited, it is preferably 20% by volume or more and 50% by volume or less with respect to the total amount of the conductive composition or conductive cured product, It is more preferably 25% by volume or more and 45% by volume or less. By setting the amount of the conductive particles within this range, the balance between flexibility and conductivity is improved.
- the conductive composition of the present invention preferably has an F value of 68% by mass or more and 90% by mass or less, more preferably 74% by mass or more and 88% by mass or less, and 81% by mass or more and 86% by mass. More preferably:
- the solid mass % mentioned here includes conductive particles other than the solvent, other fillers, resins containing polyols and polyamines, and other curing agents and additives. If the F value is less than 68% by mass, the specific resistance tends to increase. On the other hand, if it exceeds 90% by mass, the flexibility and adhesiveness tend to decrease.
- the conductive cured product of the present invention is preferably obtained by thermally curing a conductive composition.
- the heating temperature for thermosetting may be, for example, 80 to 150.degree. C., or 100 to 130.degree. Although the heating time is not particularly limited, it is preferably about 30 to 60 minutes.
- the pressure during heating is preferably normal pressure.
- the conductive cured product in the present invention further includes a thermoplastic resin, an inorganic filler, a conductive aid, a pigment, a dye, a dispersant, an antifoaming agent, a leveling agent, a thixotropic agent, a reactive diluent, a flame retardant, Antioxidants, ultraviolet absorbers, hydrolysis inhibitors, tackifiers, plasticizers, and other imparting agents can be blended.
- the content of the imparting agent is preferably 10% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less, relative to the total amount of the conductive composition.
- the conductive cured product in the present invention can be compatible with flexibility, adhesiveness, and conductivity, it is a conductive adhesive for bonding electronic parts (preferably a conductive adhesive used for flexible hybrid electronics). It is preferably used as. That is, it can be suitably used as an adhesive for bonding electronic parts containing a conductive cured product.
- a conductive adhesive used for flexible hybrid electronics By coating or printing the conductive composition of the present invention on a base material and curing the composition, it can be used as a substitute for solder for mounting electronic components.
- the process of coating the substrate is not particularly limited, and examples thereof include screen printing, stamping, dispensing, squeegee printing, and the like.
- the conductive cured product can be used for bonding and mounting of semiconductor element chip parts, circuit connection, bonding of crystal oscillators and piezoelectric elements, sealing of packages, and the like.
- the conductive cured product in the present invention has a storage elastic modulus of 50 MPa or more at 25°C measured using a viscoelasticity measuring device. It is preferably 100 MPa or more, more preferably 150 MPa or more. Also, it is 1000 MPa or less, preferably 900 MPa or less, more preferably 800 MPa or less.
- the method for measuring the storage elastic modulus of the conductive cured product is according to the method described in Examples.
- the shorter the length between the active hydrogen reactive groups in the resin structure the shorter the distance between the cross-linking points of the cured product and the higher the elastic modulus.
- the urea bonds increase the cohesive strength and increase the elastic modulus.
- the elastic modulus of the cured product can be adjusted within the above range.
- the conductive cured product of the present invention has a specific resistance of less than 2.0 ⁇ 10 ⁇ 4 ⁇ cm. It is preferably 1.5 ⁇ 10 ⁇ 4 ⁇ cm or less, more preferably 1.0 ⁇ 10 ⁇ 4 ⁇ cm or less.
- the specific resistance By setting the specific resistance within the above range, the conductivity of the conductive cured product is improved.
- the lower limit is not particularly limited, industrially, it may be 1.6 ⁇ 10 ⁇ 6 ⁇ cm or more, and may be 5.0 ⁇ 10 ⁇ 6 ⁇ cm or more.
- the method for measuring the specific resistance of the conductive cured product is according to the method described in Examples. When the silver particles in the conductive cured product have only large particle diameters, especially at a low content, when the cured product is deformed, it becomes difficult for the silver particles to come into contact with each other, and the specific resistance tends to deteriorate. be.
- the conductive cured product of the present invention preferably has a thermal conductivity of 5.0 W/m ⁇ K or more. More preferably, it is 6.5 W/m ⁇ K or more, and still more preferably 8.0 W/m ⁇ K. Although the upper limit is not particularly limited, industrially, it may be 80 W/m ⁇ K or less, and may be 50 W/m ⁇ K or less.
- the method for measuring the thermal conductivity is according to the method described in Examples.
- the conductive cured product preferably has a shear adhesive strength of 2.0 MPa or more, more preferably 2.5 MPa or more, when an oxygen-free copper plate is used as the adherend. preferable.
- the electronic device has a substrate having wiring and an electronic component, and the cured product of the conductive composition is interposed between the electronic component and the wiring.
- the wiring formed on the substrate and the electronic component can be physically and electrically connected.
- FIG. 1 is a schematic cross-sectional view showing an example of the electronic device.
- the electronic device includes a substrate 10, wiring 20 formed on the surface of the substrate 10, and an electronic component 30.
- the wiring 20 and the electronic component 30 (more precisely, electrodes 31 formed on the electronic component 30) are interposed between the cured product 40 of the conductive composition.
- the electronic component 30 and the wiring 20 are electrically connected by the cured product 40 .
- the substrate in the electronic device according to this embodiment may be a stretchable and/or bendable substrate. Since the cured product of the conductive composition has flexibility, it can follow expansion and contraction and bending of the substrate, and the occurrence of peeling and cracking at the connection between the electronic component and the wiring is suppressed. Therefore, the electronic device according to this embodiment has high connection reliability even if it is flexible.
- the stretchable and/or bendable substrate used in the present invention is not particularly limited, but includes fiber structures, resin films, rubber, and the like.
- fiber structures include knitted fabrics, woven fabrics, non-woven fabrics, and paper.
- resin films include polyethylene terephthalate, polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyethylene naphthalate, polyurethane, polyimide, polymethyl methacrylate, and silicone.
- Examples of rubber include urethane rubber, acrylic rubber, silicone rubber, butadiene rubber, nitrile rubber, nitrile group-containing rubber such as hydrogenated nitrile rubber, isoprene rubber, vulcanized rubber, styrene-butadiene rubber, butyl rubber, ethylene propylene rubber, and the like.
- ⁇ IR peak area ratio (urethane bond/urea bond)> The conductive cured product was cut into 1 mm squares, and concentrated nitric acid was added dropwise to dissolve the conductive particles. After that, the cured product was washed with water and air-dried, and was thinly spread on a KBr plate to obtain a sample for evaluation. A sample was set on an infrared microscope (Nicolet Continu ⁇ m, manufactured by Thermo Fisher Scientific Co., Ltd.), and an IR spectrum was measured by a microscopic transmission method using a resolution of 4 cm ⁇ 1 and an accumulation number of 128 times using an MCT as a detector. The IR peak area ratio (urethane bond/urea bond) was calculated by the following formula.
- IR peak area ratio of urethane bond 10 ⁇ (peak area from 1565 to 1535 cm -1 ) / ⁇ (peak area from 1660 to 1630 cm -1 ) + (peak area from 1565 to 1535 cm -1 ) ⁇
- IR peak area ratio of urea bond 10 ⁇ (peak area from 1660 to 1630 cm -1 ) / ⁇ (peak area from 1660 to 1630 cm -1 ) + (peak area from 1565 to 1535 cm -1 ) ⁇
- the peak area of 1660 to 1630 cm -1 is calculated using the line connecting the minimum values of 1800 cm -1 and 1610 to 1590 cm -1 as the baseline, and the peak area of 1565 to 1535 cm -1 is the minimum value of 1610 to 1590 cm -1 .
- a line connecting the minimum values between 1500 and 1480 cm ⁇ 1 was calculated as a baseline.
- the hydroxyl value of the polyol was measured as follows. 12.5 g of acetic anhydride was diluted with 50 mL of pyridine to prepare an acetylation reagent. Accurately weigh 2.5 to 5.0 g of a sample (polyol) in a 100 mL eggplant flask (this mass is defined as e (g)), add 5 mL of the acetylation reagent and 10 mL of toluene with a whole pipette, and attach a cooling tube. The mixture was stirred and heated at 100° C. for 1 hour.
- Active hydrogen equivalent of polyol (g/eq) 56.11 / (hydroxyl value ⁇ 10 -3 ) (ii)
- the active hydrogen equivalent of polyamine was calculated from the skeleton structure by the following formula (iii).
- Active hydrogen equivalent of polyamine (g/eq) molecular weight of polyamine/number of nitrogen atoms with active hydrogen (iii)
- ⁇ Storage modulus> The conductive composition was applied onto a Teflon film using a 200 ⁇ m gap applicator. After curing by heating at 130° C. for 60 minutes with a hot air dryer, it was cooled to room temperature. Thereafter, the coating film was cut into a size of 4 mm ⁇ 300 mm and peeled off from the Teflon film to obtain a test piece for evaluating elastic modulus. Set the test piece in a viscoelasticity measuring device (DVA-200 manufactured by IT Keisoku Co., Ltd.), strain: 0.1%, frequency: 10 Hz, heating rate: 4 ° C./min, measurement temperature range: from -10 ° C. The apparatus was operated under conditions up to 100°C, and the storage modulus at 25°C was determined.
- DVA-200 viscoelasticity measuring device
- the conductive composition was applied onto the PET film using a 50 ⁇ m gap applicator. After curing by heating at 130° C. for 60 minutes with a hot air dryer, it was cooled to room temperature. After that, the coating film was cut into a size of 10 mm ⁇ 35 mm to obtain a test piece for evaluation of specific resistance.
- the film thickness of the test piece was measured with a thickness gauge (SMD-565L manufactured by TECLOCK), and the sheet resistance of the test piece was measured using Loresta-GP (MCP-T610 manufactured by Mitsubishi Chemical Analytic Tech). Four test pieces were measured, and the average value was used to calculate the specific resistance to obtain the electrical conductivity.
- the mounted body was connected to a power supply 60 and stretched repeatedly 100 times at an elongation rate of 20%.
- the conductive composition was applied onto a Teflon film using a 200 ⁇ m gap applicator. After curing by heating at 130° C. for 60 minutes with a hot air dryer, it was cooled to room temperature. After that, the coating film was cut into a size of 10 mm ⁇ 10 mm and peeled off from the Teflon film to obtain a test piece for thermal conductivity evaluation. Thermal diffusivity, specific heat, and density were measured at 25° C., and thermal conductivity was calculated from the following formula.
- Thermal conductivity ⁇ (W/mK) ⁇ Cp d ⁇ : thermal diffusivity (m 2 /s), Cp: specific heat (J/(kg K)), d: density (kg/m 3 )
- the thermal diffusivity ⁇ was measured by the xenon flash method using a xenon flash analyzer LFA467 Hyperflash manufactured by NETZSCH.
- the density d was measured by the Archimedes method.
- the specific heat Cp was measured by the DSC method using DSC7020 manufactured by Hitachi High-Tech Science.
- Examples 1-4, Comparative Examples 1-3 ⁇ Production example of conductive cured product> Various components were added according to the compounding ratio shown in Table 1, and after preliminary mixing, the mixture was dispersed in a three-roll mill to form a paste, thereby obtaining a conductive composition. Next, a conductive cured product was obtained by curing the conductive composition. Table 1 shows the evaluation results of the obtained conductive cured product.
- a wiring 20 (silver wiring with a width of 2 mm and a length of 10 cm) is formed on a substrate 10 (polyurethane film (DUS-605CD, Seedam Co., Ltd., thickness: 50 ⁇ m)).
- a flexible substrate was prepared.
- a gap of 2 mm was provided in the central portion of the wiring 20 .
- a conductive composition was applied to chip mounting portions on both ends of the wiring 20 on the gap side, and a 3216 size LED chip 32 was mounted. Subsequently, the conductive composition was cured at 130° C. for 60 minutes to obtain a conductive cured product 40 . Thus, a mounting body for evaluation was obtained.
- both ends of the mounted body manufactured according to the manufacturing example of the mounted body were sandwiched between measuring jigs 50 having wiring electrodes 33 and connected to a power source 60 .
- An operation of moving the measuring jig 50 outward at both ends at a speed of 10 mm/sec, stretching the substrate 10 by 20%, and returning it to the initial length was repeated 100 times.
- each component in Table 1 is as follows.
- Polyol Kuraray Co., Ltd. polyester polyol P-510 (active hydrogen equivalent: 250 g/eq, hydroxyl value: 224 KOH mg/g, weight average molecular weight: 500 g/mol)
- Polyamine 1 T&K TOKA Co., Ltd. modified aliphatic amine FXD-821-F (active hydrogen equivalent: 85 g / eq, amine value: 300 KOHmg / g, viscosity: 65 mPa s)
- Polyamine 2 T&K TOKA Co., Ltd.
- modified aliphatic amine FXJ-859-C active hydrogen equivalent: 190 g / eq, amine value: 170 KOHmg / g, viscosity: 450 mPa s
- Polyamine 3 HUNTSMAN Polyoxypropylenediamine D400 (active hydrogen equivalent: 224 g/eq, amine value: 415 KOHmg/g, viscosity: 27 mPa s)
- Isocyanate Baxenden blocked isocyanate BI7992 (NCO: equivalent weight 456 g/eq)
- Conductive particles 1 Metalor Technologies Japan Co., Ltd.
- Flake silver P791-24 D50: 0.7 ⁇ m
- Conductive particles 2 Metalor Technologies Japan Co., Ltd.
- Massive silver P318-41 (D50: 9.0 ⁇ m) Conductive particles 3: Metalor Technologies Japan Co., Ltd.
- Massive silver P853-11 (D50: 8.0 ⁇ m)
- Conductive particles 4 Metalor Technologies Japan Co., Ltd.
- Massive silver P853-12 (D50: 4.9 ⁇ m)
- Examples 1 to 4 contain a resin having a urethane bond and conductive particles, have a storage modulus at 25° C. of 50 MPa or more and 1000 MPa or less, and have a specific resistance of 2.0 ⁇ 10 ⁇ 4 ⁇ cm. Since it is less than that, even if the mounting body is repeatedly stretched and contracted, there is no occurrence of cracks or a large increase in the resistance value, and the LED can be maintained in a lighting state.
- Comparative Example 1 since the storage elastic modulus was less than 50 MPa, cracks did not occur, but the resistance value increased during expansion and contraction, and the LED was extinguished. In Comparative Example 2, since the storage elastic modulus was greater than 1000 MPa, cracks occurred and the mounted LED chip was peeled off. In Comparative Example 3, since the initial conductivity was greater than 2.0 ⁇ 10 ⁇ 4 ⁇ cm, cracks did not occur, but the resistance increased and the LED went out.
- the conductive cured product of the present invention can form a flexible cured product having excellent conductivity and adhesiveness at a low temperature. Very suitable as a material.
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Abstract
Description
[1]導電性組成物の硬化物であり、前記硬化物はウレタン結合を有する樹脂と導電性粒子を含み、前記硬化物の25℃における貯蔵弾性率が、50MPa以上、1000MPa以下であり、かつ比抵抗が2.0×10-4Ω・cm未満であることを特徴とする、電子部品接合用の導電性硬化物。
[2]前記導電性硬化物の熱伝導率が5.0W/m・K以上であることを特徴とする、[1]に記載の電子部品接合用の導電性硬化物。
[3]前記導電性粒子が、銀であることを特徴とする、[1]または[2]に記載の電子部品接合用の導電性硬化物。
[4]前記導電性粒子の含有量が、前記導電性硬化物の全量の20体積%以上、50体積%以下であることを特徴とする、[1]または[3]いずれかに記載の電子部品接合用の導電性硬化物。
[5]前記導電性硬化物が、さらにウレア結合を有する樹脂を含むことを特徴とする、[1]から[4]いずれか一項に記載の電子部品接合用の導電性硬化物。
[6]導電性硬化物中のウレタン結合とウレア結合のIRピーク面積比(ウレタン結合/ウレア結合)が、7/3~1/9であることを特徴とする、[5]に記載の電子部品接合用の導電性硬化物。
[7]配線を有する基板と、電子部品とを有し、[1]から[6]いずれかに記載の導電性硬化物が電子部品と配線との間に介在している電子機器。
[8]前記基板が、伸縮および/または屈曲可能な基板であることを特徴とする、[7]記載の電子機器。
本実施形態に係る導電性硬化物は、導電性組成物の硬化物である。また、導電性硬化物(以下、単に硬化物ともいう。)は、少なくともウレタン結合を有する樹脂と、導電性粒子とを含んだ硬化物であり、ウレタン結合を有するバインダー樹脂と、導電性粒子とを含んだ硬化物であることが好ましい。また、前記硬化物は、さらにウレア結合を有する樹脂を含有することが好ましく、ウレア結合を有するバインダー樹脂を含有することがより好ましい。硬化物は、ウレタン結合を有する樹脂とウレア結合を有する樹脂をそれぞれ含有していてもよいし、同一樹脂にウレタン結合とウレア結合の両方を有していてもよい。
また、脂肪族ポリアミンまたはその変性体と、脂肪族ポリアミンまたはその変性体以外のポリアミンを組み合わせることも好ましい。ポリアミン中、脂肪族ポリアミンまたはその変性体の割合は、60質量%以上が好ましく、より好ましくは80質量%以上、さらに好ましくは90質量%以上、特に好ましくは95質量%以上、最も好ましくは98質量%以上であり、また100質量%であってもよい。
前記各イソシアネートは、単量体であってもよいが、各イソシアネートの多量体又は該多量体のイソシアヌレート体、アダクト体、ビウレット体等の変性体であることが好ましい。 最も好ましいイソシアネートは、HDIの多量体などの脂肪族系ポリイソシアネートの多量体、又はその変性体である。
銀粒子としては、同様の含有量であっても、小粒径の銀粒子を多く含む方が弾性率は上昇しやすく、大粒径を多く含む場合には柔軟性を維持しやすい。これらの任意の組み合わせにより、硬化物の弾性率を上記範囲内に調整することができる。
導電性硬化物を1mm角切り出し、濃硝酸を滴下して導電粒子を溶解した。その後、水洗し、風乾した硬化物をKBr板上に薄く延ばすことで、評価用試料を得た。赤外顕微鏡(サーモフィッシャーサイエンティフィック株式会社製 Nicolet Continuμm)に試料をセットし、顕微透過法により、分解能4cm-1、積算回数128回、検出器にMCTを用いてIRスペクトルを測定した。IRピーク面積比(ウレタン結合/ウレア結合)は下記の式により算出した。
ウレタン結合のIRピーク面積比=10×(1565~1535cm-1のピーク面積)/{(1660~1630cm-1のピーク面積)+(1565~1535cm-1のピーク面積)}
ウレア結合のIRピーク面積比=10×(1660~1630cm-1のピーク面積)/ {(1660~1630cm-1のピーク面積)+(1565~1535cm-1のピーク面積)}
1660~1630cm-1のピーク面積は、1800cm-1と1610~1590cm-1の最小値を結ぶ線をベースラインとして算出し、1565~1535cm-1のピーク面積は1610~1590cm-1の最小値と1500~1480cm-1の最小値を結ぶ線をベースラインとして算出した。
まず、ポリオールの水酸基価を以下の通り測定した。無水酢酸12.5gをピリジン50mLでメスアップしアセチル化試薬を調製した。100mLナスフラスコに、サンプル(ポリオール)を2.5~5.0g精秤し(この質量をe(g)とする)、アセチル化試薬5mLとトルエン10mLをホールピペットで添加後、冷却管を取り付けて、100℃で1時間撹拌加熱した。その後、蒸留水2.5mLをホールピペットで添加し、さらに10分間加熱撹拌した。2~3分間冷却後、エタノールを12.5mL添加し、指示薬としてフェノールフタレインを2~3滴入れた後に、0.5mol/Lエタノール性水酸化カリウムで滴定した(この滴定量をa(mL)とする)。一方、空試験として、アセチル化試薬5mL、トルエン10mL、および蒸留水2.5mLを100mLナスフラスコに入れ、10分間加熱撹拌した後、同様に滴定を行った(この滴定量をb(mL)とする)。これらの結果をもとに、下記式(i)により水酸基価を計算した。なお、式(i)中、fは滴定液(0.5mol/Lエタノール性水酸化カリウム)のファクターである。ポリオール活性水素当量は、得られたポリオールの水酸基価をもとに、下記式(ii)により求めた。
ポリオールの水酸基価(mg-KOH/g)
={(b-a)×28.05×f}/e (i)
ポリオールの活性水素当量(g/eq)
=56.11/(水酸基価×10-3) (ii)
ポリアミンの活性水素当量は、骨格構造から、下記式(iii)により計算した。
ポリアミンの活性水素当量(g/eq)
=ポリアミンの分子量/活性水素を有する窒素原子の数 (iii)
導電性組成物をテフロン(登録商標)フィルム上に、200μmギャップのアプリケーターを用いて塗布した。熱風乾燥機で130℃60分加熱硬化させた後、室温まで冷却した。その後、塗膜を4mm×300mmにカットし、テフロンフィルムから剥離して弾性率の評価用試験片を得た。粘弾性測定装置(アイティー計測制御社製 DVA-200)に試験片をセットし、ひずみ:0.1%、周波数:10Hz、昇温速度:4℃/min、測定温度範囲:-10℃から100℃までの条件で装置を動かし、25℃の貯蔵弾性率を求めた。
導電性組成物をPETフィルム上に、50μmギャップのアプリケーターを用いて塗布した。熱風乾燥機で130℃60分加熱硬化させた後、室温まで冷却した。その後、塗膜を10mm×35mmにカットして比抵抗の評価用試験片を得た。試験片の膜厚をシックネスゲージ(TECLOCK社製 SMD-565L)で測定し、試験片のシート抵抗をLoresta-GP(三菱化学アナリテック社製 MCP-T610)を用いて測定した。それぞれ試験片4枚について測定し、その平均値を用いて比抵抗を算出し、導電率を求めた。
図3に示すように実装体を電源60に接続し、20%の伸長率で100回繰り返し伸縮させた後、LEDチップが点灯していたものを○、点灯しなくなったものを×とした。
図3に示すように実装体を電源に接続し、20%の伸長率で100回繰り返し伸縮させた後、導電性硬化物40の部分を顕微鏡(オリンパス株式会社、OLS4100)を用いて観察した。クラックの発生が観察できなかったものは、クラックなし、クラックが観察されたものは、クラックありとした。
導電性組成物をテフロン(登録商標)フィルム上に、200μmギャップのアプリケーターを用いて塗布した。熱風乾燥機で130℃60分加熱硬化させた後、室温まで冷却した。その後、塗膜を10mm×10mmにカットし、テフロンフィルムから剥離して熱伝導率の評価用試験片を得た。25℃においての熱拡散率・比熱・密度を測定し、下式から熱伝導率を算出した。
熱伝導率λ(W/mK)=α・Cp・d
α:熱拡散率(m2/s)、Cp:比熱(J/(kg・K))、d:密度(kg/m3)
熱拡散率αは、NETZSCH社製キセノンフラッシュアナライザーLFA467Hyperflashを用いて、キセノンフラッシュ法により測定した。密度dはアルキメデス法により測定した。また、比熱Cpについては日立ハイテクサイエンス社製DSC7020を用いて、DSC法により測定した。
<導電性硬化物の製造例>
各種成分を表1の配合比に従って添加し、予備混合の後、三本ロールミルにて分散することによりペースト化し、導電性組成物を得た。次いで、前記導電性組成物を硬化することにより導電性硬化物を得た。得られた導電性硬化物の評価結果を表1に示す。
図2(a)~(c)に示すように、基材10(ポリウレタンフィルム(シーダム株式会社 DUS-605CD、厚み:50μm))上に配線20(幅2mm、長さ10cmの銀配線)が形成されたフレキシブル基板を準備した。なお、配線20は中央部に2mmの隙間を設けた。配線20の隙間側の両端であるチップ実装部分に導電性組成物を塗布し、3216サイズのLEDチップ32をマウントした。続いて、130℃60分で導電性組成物を硬化させ、導電性硬化物40とした。これにより、評価用の実装体を得た。
図3に示すように、実装体の製造例に従って製造した実装体の両端を配線部電極33がついた測定治具50で挟み込み、電源60に接続した。測定治具50を速度10mm/secで両端外側に移動させ、基板10を20%伸長した後に初期の長さに戻すという動作を100回繰り返した。
ポリオール:株式会社クラレ ポリエステルポリオール P-510(活性水素当量:250g/eq、水酸基価:224KOHmg/g、重量平均分子量:500g/mol)
ポリアミン1:株式会社T&K TOKA 変性脂肪族アミン FXD-821-F(活性水素当量:85g/eq、アミン価:300KOHmg/g、粘度:65mPa・s)
ポリアミン2:株式会社T&K TOKA 変性脂肪族アミン FXJ-859-C(活性水素当量:190g/eq、アミン価:170KOHmg/g、粘度:450mPa・s)
ポリアミン3:HUNTSMAN社 ポリオキシプロピレンジアミン D400(活性水素当量:224g/eq、アミン価:415KOHmg/g、粘度:27mPa・s)
イソシアネート:Baxenden社 ブロックイソシアネート BI7992(NCO:当量456g/eq)
導電性粒子1:メタローテクノロジーズジャパン株式会社 フレーク銀 P791-24(D50:0.7μm)
導電性粒子2:メタローテクノロジーズジャパン株式会社 塊状銀 P318-41(D50:9.0μm)
導電性粒子3:メタローテクノロジーズジャパン株式会社 塊状銀 P853-11(D50:8.0μm)
導電性粒子4:メタローテクノロジーズジャパン株式会社 塊状銀 P853-12(D50:4.9μm)
20.配線
30.電子部品
31.電極
32.LEDチップ
33.配線部電極
40.導電性硬化物
50.測定治具
60.電源
Claims (8)
- 導電性組成物の硬化物であり、前記硬化物はウレタン結合を有する樹脂と導電性粒子を含み、前記硬化物の25℃における貯蔵弾性率が、50MPa以上、1000MPa以下であり、かつ比抵抗が2.0×10-4Ω・cm未満であることを特徴とする、電子部品接合用の導電性硬化物。
- 前記導電性硬化物の熱伝導率が5.0W/m・K以上であることを特徴とする、請求項1に記載の電子部品接合用の導電性硬化物。
- 前記導電性粒子が、銀であることを特徴とする、請求項1または2に記載の電子部品接合用の導電性硬化物。
- 前記導電性粒子の含有量が、前記導電性硬化物の全量の20体積%以上、50体積%以下であることを特徴とする、請求項1または2に記載の電子部品接合用の導電性硬化物。
- 前記導電性硬化物が、さらにウレア結合を有する樹脂を含むことを特徴とする、請求項1または2に記載の電子部品接合用の導電性硬化物。
- 前記導電性硬化物中のウレタン結合とウレア結合のIRピーク面積比(ウレタン結合/ウレア結合)が、7/3~1/9であることを特徴とする、請求項5に記載の電子部品接合用の導電性硬化物。
- 配線を有する基板と、電子部品とを有し、請求項1または2に記載の導電性硬化物が電子部品と配線との間に介在している電子機器。
- 前記基板が、伸縮および/または屈曲可能な基板であることを特徴とする、請求項7に記載の電子機器。
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JPH07286148A (ja) * | 1994-04-18 | 1995-10-31 | Sumitomo Metal Mining Co Ltd | 電子材料用導電性接着剤 |
JP2005298812A (ja) * | 2004-03-19 | 2005-10-27 | Toyo Ink Mfg Co Ltd | 接着剤組成物、それを用いた接着剤シート、および補強材付きフレキシブルプリント配線板 |
JP4467439B2 (ja) | 2003-03-18 | 2010-05-26 | ダウ・コーニング・コーポレイション | 導電性組成物及び該導電性組成物の使用法 |
JP5200662B2 (ja) | 2008-05-27 | 2013-06-05 | 藤倉化成株式会社 | 導電性接着剤および電子部品 |
JP2018048286A (ja) | 2016-09-23 | 2018-03-29 | 日亜化学工業株式会社 | 導電性接着剤および導電性材料 |
WO2020090757A1 (ja) * | 2018-10-29 | 2020-05-07 | ナミックス株式会社 | 導電性樹脂組成物、導電性接着剤、および半導体装置 |
JP2020150236A (ja) | 2019-03-15 | 2020-09-17 | パナソニックIpマネジメント株式会社 | 導電性組成物および電子機器 |
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Patent Citations (7)
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JPH07286148A (ja) * | 1994-04-18 | 1995-10-31 | Sumitomo Metal Mining Co Ltd | 電子材料用導電性接着剤 |
JP4467439B2 (ja) | 2003-03-18 | 2010-05-26 | ダウ・コーニング・コーポレイション | 導電性組成物及び該導電性組成物の使用法 |
JP2005298812A (ja) * | 2004-03-19 | 2005-10-27 | Toyo Ink Mfg Co Ltd | 接着剤組成物、それを用いた接着剤シート、および補強材付きフレキシブルプリント配線板 |
JP5200662B2 (ja) | 2008-05-27 | 2013-06-05 | 藤倉化成株式会社 | 導電性接着剤および電子部品 |
JP2018048286A (ja) | 2016-09-23 | 2018-03-29 | 日亜化学工業株式会社 | 導電性接着剤および導電性材料 |
WO2020090757A1 (ja) * | 2018-10-29 | 2020-05-07 | ナミックス株式会社 | 導電性樹脂組成物、導電性接着剤、および半導体装置 |
JP2020150236A (ja) | 2019-03-15 | 2020-09-17 | パナソニックIpマネジメント株式会社 | 導電性組成物および電子機器 |
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