WO2008004367A1 - Conductive particle, adhesive composition, circuit-connecting material, circuit-connecting structure, and method for connection of circuit member - Google Patents
Conductive particle, adhesive composition, circuit-connecting material, circuit-connecting structure, and method for connection of circuit member Download PDFInfo
- Publication number
- WO2008004367A1 WO2008004367A1 PCT/JP2007/057978 JP2007057978W WO2008004367A1 WO 2008004367 A1 WO2008004367 A1 WO 2008004367A1 JP 2007057978 W JP2007057978 W JP 2007057978W WO 2008004367 A1 WO2008004367 A1 WO 2008004367A1
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- circuit
- connection
- particles
- particle
- conductive
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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
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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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
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
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- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- 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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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
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- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
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Definitions
- the present invention relates to conductive particles, an adhesive composition, a circuit connection material and a connection structure, and a circuit member connection method.
- COG mounting is a method in which an IC for driving a liquid crystal is directly bonded onto a glass panel.
- COF mounting is a method in which a liquid crystal driving IC is joined to a flexible tape with metal wiring, and this is joined to a glass panel.
- Patent Document 1 describes a connection member in which an adhesive layer having an insulating property is formed on one surface of an adhesive layer containing conductive particles.
- Patent Documents 2 and 3 describe a technique using conductive particles whose surfaces are coated with an insulating film.
- Patent Document 1 Japanese Patent Laid-Open No. 08-279371
- Patent Document 2 Japanese Patent No. 2794009
- Patent Document 3 Japanese Patent Laid-Open No. 2001-195921
- connection member described in Patent Document 1 it is possible to achieve both the low resistance value of the connection portion and the insulation between the adjacent circuit electrodes.
- the bump area is very small (for example, less than 3000 m 2 )
- the present invention has been made in view of such a situation, and when connecting circuit members having fine circuit electrodes, a sufficiently low initial resistance value of a connection portion and between adjacent circuit electrodes are provided.
- An object of the present invention is to provide conductive particles, an adhesive composition, and a circuit connection material using the same that can achieve both excellent insulating properties and can sufficiently suppress the increase in resistance value of a connection portion over time.
- the conductive particle of the present invention includes a conductive core particle and an insulating coating containing an organic polymer compound provided on the surface of the core particle, and is defined by the following formula (1): Coverage rate power ⁇ 0 to 40%.
- Equation 1 i ibm ⁇ (0 / _ the area of the portion of the core particle surface covered with the insulation coating ii .
- the conductive particles of the present invention are provided with an insulating coating so that the coverage is in the range of 20 to 40%. It is. When the coverage of the conductive particles is 20 to 40%, a sufficient amount of the conductive particles can be contained in the adhesive component to obtain a low initial resistance value. This is because even if the conductive particles agglomerate as the content of the conductive particles increases, the insulating coating provided on each conductive particle sufficiently prevents electrical connection between adjacent circuit electrodes. This is because it can.
- the degree of crosslinking of the organic polymer compound constituting the insulating coating of the conductive particles of the present invention is preferably 5 to 20%.
- the degree of cross-linking of the organic polymer compound is 5 to 20%, excellent insulation between adjacent circuit electrodes can be ensured more reliably, and the low resistance value of the connection portion and the increase of this resistance value over time can be achieved. Both suppressions can be achieved more reliably
- the insulating coating provided in the conductive particles of the present invention can be composed of a plurality of insulating particles containing an organic high molecular compound provided on the surface of the core particles.
- the ratio (D ZD) of the particle size (D) of the insulating particles to the particle size (D) of the core particles is 1Z10 or less.
- this ratio is equal to or less than lZio, both the low resistance value of the connecting portion and the suppression of the increase in resistance value over time can be achieved more reliably.
- the insulating coating provided in the conductive particles of the present invention can be composed of an insulating layer containing an organic high molecular compound provided on the surface of the core particles.
- the ratio (T ZD) between the thickness (T) of the insulating layer and the particle size (D) of the core particles is preferably 1Z10 or less.
- the adhesive composition of the present invention includes an adhesive component having adhesiveness, and is dispersed in the adhesive component. And the above-mentioned conductive particles of the present invention. Since the adhesive composition of the present invention includes the above conductive particles, even if the circuit electrode to be connected is fine, the connection portion has a sufficiently low initial resistance value and excellent between adjacent circuit electrodes. It is possible to achieve both insulation properties and sufficiently suppress the increase in resistance value of the connection part over time.
- the circuit connecting material of the present invention is the above-mentioned adhesive composition according to the present invention, and adheres the circuit members together and electrically connects the circuit electrodes of the respective circuit members. It is used for.
- connection structure of the present invention includes a pair of circuit members arranged opposite to each other and a cured product of the circuit connection material according to the present invention, and is interposed between the pair of circuit members and the circuit electrodes included in the respective circuit members. And a connecting portion that bonds the circuit members together so that they are electrically connected to each other.
- connection structure of the present invention at least one of the pair of circuit members may be an IC chip.
- the surface force of at least one of the circuit electrodes each of the pair of circuit members includes gold, silver, tin, ruthenium, rhodium, palladium, osmium, iridium, platinum, and indium stannate. It may be composed of at least one selected.
- connection structure of the present invention at least one of the contact surfaces of the pair of circuit members that are in contact with the connection portion is at least one selected from silicon nitride, silicone compound, and polyimide resin. It may have a part composed of more than seed materials.
- the circuit member connection method of the present invention is a cured product of a circuit connection material in which the circuit connection material according to the present invention is interposed between a pair of circuit members arranged opposite to each other, and the whole is heated and pressurized. And forming a connecting portion for bonding the circuit members so that the circuit electrodes of the respective circuit members are electrically connected to each other. A connection structure including a connection portion is obtained.
- connection portion when connecting circuit members having fine circuit electrodes, both a sufficiently low initial resistance value of the connection portion and excellent insulation between adjacent circuit electrodes are obtained. It is possible to provide conductive particles, an adhesive composition, and a circuit connection material using the same that can be achieved and can sufficiently suppress the increase in the resistance value of the connection portion over time. In addition, it is possible to provide a connection structure in which circuit members are connected using the circuit connection material described above, and a circuit member connection method for obtaining the connection structure.
- FIG. 1 is a cross-sectional view showing a state in which a circuit connecting material including conductive particles according to the present invention is used between circuit electrodes, and the circuit electrodes are connected to each other.
- FIG. 2 is a cross-sectional view showing an embodiment of a circuit connection material according to the present invention.
- FIG. 3 is a cross-sectional view showing an embodiment of conductive particles according to the present invention.
- FIG. 4 is a cross-sectional view showing another embodiment of the conductive particles according to the present invention.
- FIG. 5 is a cross-sectional view showing a state in which the circuit connection material according to the present invention is provided on a support.
- FIG. 6 is a schematic diagram showing an embodiment of a circuit member connecting method according to the present invention in a schematic sectional view.
- FIG. 7 is a cross-sectional view showing a state in which the circuit connecting material according to the present invention is supported by a support.
- (meth) acrylic acid means “acrylic acid” and the corresponding “ “Methacrylic acid” means “(meth) atalylate” means “atarylate” and its corresponding “methacrylate”.
- FIG. 1 is a schematic cross-sectional view showing a connection structure in which an adhesive composition comprising conductive particles according to the present invention is used as a circuit connection material and circuit electrodes are connected to each other.
- the connection structure 100 shown in FIG. 1 includes a first circuit member 30 and a second circuit member 40 that are opposed to each other, and the first circuit member 30 and the second circuit member 40 are disposed between the first circuit member 30 and the second circuit member 40.
- a connecting portion 5 Oa for connecting them is provided.
- the first circuit member 30 includes a circuit board (first circuit board) 31 and a circuit electrode (first circuit electrode) 32 formed on the main surface 31a of the circuit board 31.
- the second circuit member 40 includes a circuit board (second circuit board) 41 and a circuit electrode (second circuit electrode) 42 formed on the main surface 41 a of the circuit board 41.
- the surfaces of the circuit electrodes 32 and 42 are flat.
- the surface of the circuit electrode is flat means that the unevenness of the surface of the circuit electrode is 20 nm or less.
- the circuit member include chip components such as an IC chip (semiconductor chip), a resistor chip, and a capacitor chip. These circuit members are provided with circuit electrodes, and generally have many circuit electrodes. Specific examples of the other circuit member to which the circuit member is connected include a wiring board such as a flexible tape having metal wiring, a flexible printed wiring board, and a glass substrate on which indium tin oxide (ITO) is deposited. Can be mentioned. According to the present invention, these circuit members can be connected efficiently and with high connection reliability. Therefore, the conductive particles according to the present invention are suitable for COG mounting or COF mounting on a wiring board of a chip component having a large number of fine connection terminals (circuit electrodes).
- ITO indium tin oxide
- the main surfaces 31a and Z or the main surface 41a may be coated with an organic insulating material such as silicon nitride, silicone compound and silicone resin, and photosensitive or non-photosensitive polyimide resin. Further, the main surfaces 31a and Z or the main surface 41a may partially have a region made of the above material. Further, the circuit boards 31 and Z or the circuit board 41 itself may have the above material strength.
- the main surfaces 31a and 41a may be composed of one or more of the above materials, or may be composed of two or more. Select the adhesive component as appropriate In particular, circuit boards having portions made of the above-mentioned materials can be suitably connected.
- each circuit electrode 32, 42 is composed of one kind selected from gold, silver, tin, ruthenium, rhodium, palladium, osmium, iridium, platinum and indium stannate (ITO). It may be composed of two or more types.
- the surface material of the circuit electrodes 32, 42 is Even if they are the same, they are different!
- the connecting portion 50a includes a cured product 20a of an adhesive component contained in the circuit connecting material, and conductive particles 10A dispersed therein.
- the circuit electrode 32 and the circuit electrode 42 facing each other are electrically connected through the conductive particles 10A. That is, the conductive particle 10A force circuit electrode 32 and 42 are in direct contact with each other.
- connection resistance between the circuit electrodes 32 and 42 is sufficiently reduced, and a good electrical connection between the circuit electrodes 32 and 42 becomes possible.
- the cured product 20a has electrical insulation, and insulation between adjacent circuit electrodes is ensured. Therefore, the current flow between the circuit electrodes 32 and 42 can be made smooth, and the functions of the circuit can be fully exhibited.
- FIG. 2 is a schematic cross-sectional view showing a preferred embodiment when the adhesive composition according to the present invention is used as a circuit connecting material.
- the shape of the circuit connecting material 50 shown in FIG. 2 is a sheet shape.
- the circuit connecting material 50 includes an adhesive component 20 and conductive particles 10A dispersed in the adhesive component 20.
- the adhesive composition may be in the form of a paste, but when used for COG mounting such as an IC chip or COF mounting, it is preferable to form the circuit connection material in a sheet shape from the viewpoint of workability. .
- the circuit connection material 50 is produced by applying an adhesive composition containing an adhesive component and conductive particles on a film-like support using a coating apparatus and drying with hot air for a predetermined time.
- FIG. 3 is a cross-sectional view showing a preferred embodiment of the conductive particles according to the present invention.
- Conductive particles 10A shown in FIG. 3 are composed of conductive core particles 1 and a plurality of insulating particles 2 provided on the surface of the core particles 1. Consists of A.
- the core particle 1 includes a base particle la constituting a central portion and a conductive layer lb provided on the surface of the base particle la.
- Examples of the material of the base particle la include glass, ceramics, and organic polymer compounds. Of these materials, those that are deformed by heating and Z or pressure (for example, glass, organic polymer compounds) are preferable.
- the base particle la is deformed, when the conductive particle 10A is pressed by the circuit electrodes 32 and 42, the contact area with the circuit electrode increases. Further, irregularities on the surface of the circuit electrodes 32 and 42 can be absorbed. Therefore, the connection reliability between circuit electrodes is improved.
- materials suitable for constituting the base particle la include, for example, acrylic resin, styrene resin, benzoguanamine resin, silicone resin, polybutadiene resin, or a copolymer of these The union and these are cross-linked.
- the base particle la may be the same or different kind of material between the particles, and one kind of material may be used alone or a mixture of two or more kinds of materials may be used.
- the average particle size of the base particle la is preferably 0.5 to 20 m, and more preferably 1 to 10 / ⁇ ⁇ , which can be appropriately designed depending on the application. More preferably, it is 2-5 / ⁇ ⁇ . If conductive particles are produced using base particles having an average particle size of less than 0.5 m, secondary aggregation of the particles occurs, and the insulation between adjacent circuit electrodes tends to be insufficient. When conductive particles are produced using base particles exceeding m, the insulation between adjacent circuit electrodes tends to be insufficient due to the size.
- the conductive layer lb is a layer made of a conductive material provided so as to cover the surface of the base particle la. From the viewpoint of ensuring sufficient conductivity, it is preferable that the conductive layer lb covers the entire surface of the base particle la.
- Examples of the material of the conductive layer lb include gold, silver, platinum, nickel, copper and alloys thereof, alloys such as solder containing tin, and nonmetals having conductivity such as carbon. . Since the base particle la can be coated with electroless plating, the conductive layer lb is preferably made of metal. Further, in order to obtain a sufficient pot life, gold, more preferably gold, silver, platinum or an alloy thereof is more preferable. These are 1 Species can be used alone or in combination of two or more.
- the thickness of the conductive layer lb can be appropriately designed according to the material and application used for the conductive layer lb. 1S is preferably 50 to 200 nm, more preferably 80 to 150 nm. If the thickness is less than 50 nm, there is a tendency that a sufficiently low resistance value cannot be obtained at the connection portion. On the other hand, the conductive layer lb having a thickness exceeding 200 nm tends to decrease the production efficiency.
- the conductive layer lb can be composed of one layer or two or more layers.
- the surface layer of the core particle 1 should be composed of gold, silver, platinum or an alloy thereof from the viewpoint of the preservability of the adhesive composition produced using this. However, it is more preferable to make it with gold.
- the conductive layer lb is composed of one layer made of gold, silver, platinum or an alloy thereof (hereinafter referred to as “metal such as gold”), in order to obtain a sufficiently low resistance value of the connection portion,
- the thickness is preferably 10 to 200 nm.
- the outermost layer of the conductive layer lb is preferably composed of a metal such as gold, but the layer between the outermost layer and the base particle la is
- the thickness of the metal layer made of a metal such as gold constituting the outermost layer of the conductive layer lb is preferably 30 to 200 nm from the viewpoint of storage stability of the adhesive composition.
- Nickel, copper, tin, or their alloys may generate free radicals by redox action. For this reason, when the thickness of the outermost layer made of a metal such as gold is less than 30 nm, it tends to be difficult to sufficiently prevent the effects of free radicals when used in combination with an adhesive component having radical polymerizability. is there.
- Examples of the method for forming the conductive layer lb on the surface of the base particle la include electroless plating and physical coating. From the viewpoint of easy formation of the conductive layer lb, it is preferable to form the conductive layer lb made of metal on the surface of the base particle la by electroless plating.
- the insulating particles 2A are composed of an organic polymer compound.
- the organic polymer compound those having heat softness are preferable.
- Suitable materials for the insulating particles include, for example, polyethylene, ethylene-acetic acid copolymer, ethylene- (meth) acrylic copolymer, ethylene (meth) acrylic acid copolymer, ethylene (meth) acrylic acid ester copolymer.
- Polymer polyester, polyamide, polyurethane, polystyrene, styrene-divinylbenzene copolymer Polymer, styrene isobutylene copolymer, styrene butadiene copolymer, styrene (meth) acrylic copolymer, ethylene propylene copolymer, (meth) acrylic acid ester rubber, styrene ethylene-butylene copolymer, phenoxy resin Solid epoxy resin. These may be used alone or in combination of two or more. Styrene (meth) acrylic copolymer is particularly suitable from the viewpoints of dispersion degree of particle size distribution, solvent resistance and heat resistance. Examples of the method for producing the insulating particles 2A include a seed polymerization method.
- the softening point of the organic polymer compound constituting the insulating particles 2A is preferably equal to or higher than the heating temperature at the time of connection between the circuit members.
- the softening point is lower than the heating temperature at the time of connection, the insulating particles 2A are excessively deformed at the time of connection, so that a good electrical connection tends not to be obtained.
- the degree of crosslinking of the organic polymer compound constituting the insulating particles 2A is preferably 5 to 20%, more preferably 5 to 15%, and more preferably 8 to 13%. Further preferred. Organic polymer compounds having a crosslinking degree within the above range have characteristics that both connection reliability and insulation are superior compared to organic polymer compounds outside the range. Therefore, if the degree of cross-linking is less than 5%, the insulation between adjacent electrode circuits tends to be insufficient. On the other hand, when the degree of cross-linking exceeds 20%, it tends to be difficult to achieve both sufficiently low initial resistance values at the connection portions and suppression of temporal increase in resistance values.
- the degree of crosslinking of the organic polymer compound can be adjusted by the composition ratio of the crosslinkable monomer and the non-crosslinkable monomer.
- the degree of crosslinking in the present invention means a theoretical calculated value based on the composition ratio (charged weight ratio) between the crosslinking monomer and the non-crosslinking monomer. That is, it is a value calculated by dividing the charge weight of the crosslinkable monomer blended when synthesizing the organic polymer compound by the total charge weight ratio of the crosslinkable and non-crosslinkable monomers.
- the gel fraction of the organic polymer compound constituting the insulating particles 2A is preferably 90% or more, more preferably 95% or more.
- the gel fraction is less than 90%, when the conductive particles 10A are dispersed in the adhesive component to produce an adhesive composition, the insulation resistance of the adhesive component tends to decrease with time.
- the gel fraction here is an index indicating the resistance of the organic polymer compound to the solvent.
- the measurement method will be described below. Measure the mass (mass A) of the organic polymer compound (sample to be measured) whose gel fraction is to be measured. Place the sample to be measured in a container and put the solvent in it. The sample to be measured is immersed in a solvent for 24 hours at a temperature of 23 ° C. Then, remove the solvent by evaporating it, and measure the mass (mass B) of the sample to be measured after stirring and immersion.
- the gel fraction (%) is a value calculated by the equation (mass BZ mass AX 100).
- the solvent used for the measurement of the gel fraction is toluene.
- toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, and tetrahydrofuran are used for preparing the adhesive composition solution.
- One of these can be used alone or in combination of two or more.
- the average particle diameter of the insulating particles 2A is a force that can be appropriately designed according to the use etc. 50-50 Onm is preferred 50-400 nm is more preferred 100-300 nm More preferably it is. If the average particle size is less than 50 nm, the insulation between adjacent circuits tends to be insufficient.On the other hand, if it exceeds 500 nm, the initial resistance value of the connection portion is sufficiently low and the resistance value increases with time. It tends to be difficult to achieve both of these.
- the insulating particles 2A are formed on the surface of the core particles 1 so that the coverage defined by the above formula (1) is 20 to 40%. From the viewpoint of more reliably obtaining the effects of the present invention, the coverage is preferably 25 to 35%, more preferably 28 to 32%. If the coverage is less than 20%, the insulation between adjacent circuit electrodes tends to be insufficient.On the other hand, if it exceeds 40%, the initial resistance value and the resistance value over time are sufficiently low. Tend to be difficult to achieve both the positive rise suppression.
- the plurality of insulating particles 2A covering the core particle 1 are preferably sufficiently dispersed on the surface of the core particle 1.
- the coverage in the present invention is based on the following measured values obtained by observation with a differential scanning electron microscope (magnification: 8000 times). That is, the coverage is a value calculated based on the particle diameter of each of the core particles and the insulating particles, and the number of insulating particles attached to one core particle. Measure as described above for 50 arbitrarily selected particles and calculate the average value.
- the particle size of the core particle 1 is measured as follows. That is, one core particle is arbitrarily selected, and this is observed with a differential scanning electron microscope, and its maximum diameter and minimum diameter are measured. The square root of the product of the maximum diameter and the minimum diameter is defined as the particle diameter of the particle.
- the particle diameter is measured as described above for 50 arbitrarily selected core particles, and the average value is defined as the particle diameter (D) of the core particle 1.
- the particle diameter of the insulating particles 2A is measured for 50 arbitrary insulating particles, and the average value is defined as the particle diameter (D) of the insulating particles 2A.
- the number of insulating particles included in one conductive particle is measured as follows. In other words, one conductive particle whose surface is partially covered with a plurality of insulating particles 2A is arbitrarily selected. Then, this is imaged with a differential scanning electron microscope, attached to the surface of the observable core particle, and the number of insulating particles counted. The number of insulating particles adhering to one core particle is calculated by doubling the obtained count. The number of insulating particles is measured as described above for 50 arbitrarily selected conductive particles, and the average value is defined as the number of insulating particles included in one conductive particle.
- the total surface area of the core particles of the formula (1) means the surface area of a sphere having the above-mentioned diameter D.
- the area of the core particle surface covered with the insulation coating is the above D
- the ratio of the average particle diameter D of the insulating particles 2A to the average particle diameter D of the core particles 1 (D / ⁇ ) is lZl
- D ZD 0 or less, more preferably 1Z15 or less.
- the lower limit of this ratio (D ZD) is preferably 1Z20.
- the insulating coating formed on the surface of the core particle 1 is not limited to a spherical one like the insulating particle 2A.
- the insulating coating may be an insulating layer made of the same material as the insulating particles 2A.
- a conductive particle 10B shown in FIG. 4 includes an insulating layer 2B partially provided on the surface of the core particle 1.
- the insulating layer 2B is composed of core particles 1 so that the coverage defined by the formula (1) is 20 to 40%. Formed on the surface. From the viewpoint of more reliably obtaining the effects of the present invention, the coverage is preferably 25 to 35%, more preferably 28 to 32%. If the coverage is less than 20%, the insulation between adjacent circuit electrodes tends to be insufficient.On the other hand, if it exceeds 40%, the initial resistance value and the resistance value over time are sufficiently low. Tends to be difficult to achieve both. In addition, it is preferable that each covering region of the insulating layer 2B covering the core particle 1 is sufficiently dispersed on the surface of the core particle 1. Each covered region may be isolated or continuous.
- the ratio ( ⁇ / ⁇ ) between the thickness T of the insulating layer 2B and the average particle size D of the core particles 1 is less than or equal to lZlO.
- the lower limit of 2 1 is preferably 1Z20.
- the coverage when the insulating coating is formed of the insulating layer 2B can be calculated by the following procedure. In other words, 50 arbitrarily selected conductive particles are respectively imaged with a differential scanning electron microscope, adhered on the observable core particle surface, and obtained by arithmetically averaging the measured values of the area of the insulating layer. Can do. Insulating layer 2B thickness T
- an insulating coating (insulating particle 2A or insulating layer 2B) on the surface of the core particle 1
- a known method can be used, and a chemical change by an organic solvent or a dispersant is used.
- a dry method using physical and mechanical changes caused by machinery energy For example, a spraying method, a high-speed stirring method, a spray dryer method and the like can be mentioned.
- the particle diameter is sufficiently uniform, and a plurality of insulating particles 2A are provided on the surface of the core particle 1, thereby forming an insulating coating. It is preferable. In addition, it is preferable to use the V, dry method without using a solvent, rather than the wet method, where it is difficult to completely remove the solvent and dispersant.
- a dry method for example, Mechanomill (trade name, manufactured by Tokuju Kogakusho Co., Ltd.), Hybridizer (manufactured by Nara Machinery Co., Ltd., product) Name: NHS series).
- a nobridizer because the surface of the core particle 1 can be modified into a suitable state when the insulating coating is formed on the surface of the core particle 1. According to this apparatus, precise coating at the particle level can be performed, and insulating particles 2A having a sufficiently uniform particle diameter can be formed on the surface of the core particle 1.
- the shape of the insulating coating can be controlled, for example, by adjusting the conditions of the coating process.
- the conditions for the coating treatment are, for example, temperature and rotation speed.
- the particle size of the insulating particles 2A or the thickness of the insulating layer 2B adjusts the coating treatment conditions and the mixing ratio between the core particles 1 and the organic polymer compound (insulating coating material) used for the treatment. This is what you can do.
- the temperature of the coating treatment is preferably 30 to 90 ° C, more preferably 50 to 70 ° C. Further, the rotation speed of the coating treatment (dry method) is preferably 6000 to 20000 Z min, more preferably 10,000 to 17000 min.
- the adhesive component 20 includes: (a) a composition containing an adhesive composed of a thermosetting resin and (b) a thermosetting resin curing agent; and (c) generating free radicals by heating or light.
- a composition containing a curing agent and an adhesive composed of (d) a radical polymerizable substance, or a mixed composition with (a), (b), (c) and (d) is preferred.
- the adhesive component may be a thermoplastic resin such as polyethylene or polypropylene.
- thermoplastic resin such as polyethylene or polypropylene.
- curable resins such as epoxy resin, polyimide resin, polyamideimide resin, and acrylic resin are preferable.
- the adhesive component will be described in detail.
- the thermosetting resin is not particularly limited as long as it is a thermosetting resin that can be cured in an arbitrary temperature range, but an epoxy resin is preferable.
- Epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, phenol novolac type epoxy resin, and cresol novola.
- thermosetting resin curing agents include amines, phenols, acid anhydrides, imidazoles, hydrazides, dicyandiamide, boron trifluoride-amine complexes, sulfonium. Salt, iodonium salt, aminimide and the like. These may be used alone or in combination of two or more, and may be used by mixing a decomposition accelerator, an inhibitor and the like. In addition, it is preferable to use these curing agents coated with a polyurethane-based or polyester-based polymer substance and then micro-pressed because the pot life is extended.
- the blending amount of the thermosetting resin curing agent is preferably about 0.1 to 60.0% by mass based on the total mass of the adhesive component. 1.0 to 20 More preferably 0% by mass. If the blending amount of the thermosetting resin curing agent is less than 0.1% by mass, the progress of the curing reaction tends to be insufficient, and it tends to be difficult to obtain good adhesive strength and connection resistance. . On the other hand, if it exceeds 60% by mass, the fluidity of the adhesive component tends to decrease and the pot life tends to be shortened. In addition, the connection resistance value of the connection portion tends to increase.
- Curing agents that generate free radicals by heating or light include those that generate free radicals by decomposition by heating or light, such as peroxide compounds and azo compounds. It is appropriately selected depending on the target connection temperature, connection time, pot life and the like. From the viewpoint of high reactivity and pot life, organic peroxides having a half-life of 10 hours at a temperature of 40 ° C or more and a half-life of 1 minute at a temperature of 180 ° C or less are preferred. In this case, the amount of the curing agent that generates free radicals by heating or light is preferably 0.05 to 10% by mass based on the total mass of the adhesive component. More preferably 5% by mass.
- Curing agents that generate free radicals by heating or light are specifically diacyl peroxide, peroxydicarbonate, peroxyester, peroxyketal, dialkyl peroxide, hyde mouth A force such as peroxide can also be selected.
- Circuit member In order to suppress the corrosion of circuit electrodes, it is preferable to select from peroxyesters, dialkyl peroxides, dioxygen peroxides, and oxyperoxides that provide high reactivity. I like it.
- disilver oxides include isobutyl peroxide, 2,4-dichlorobenzoic peroxide, 3, 5, 5-trimethylhexanoyl peroxide, octanoyl peroxide, and lauroyl peroxide.
- examples thereof include oxide, stearoyl peroxide, succinic peroxide, benzoyl peroxide, and benzoyl peroxide.
- peroxydicarbonates examples include di-n-propyl peroxydicarbonate, diisopropyl peroxydicarbonate, bis (4-tert-butylcyclohexyl) peroxydicarbonate, di-2- Examples include ethoxymethoxy baroxydicarbonate, di (2-ethylhexyloxy) dicarbonate, dimethoxybutyl dioxygen dicarbonate, di (3-methyl-3-methoxybutyl dioxy) dicarbonate, and the like.
- peroxyesters include, for example, Tamil peroxyneodecanoate, 1, 1, 3, 3-tetramethylbutyl peroxyneodecanoate, 1-cyclohexyl lure 1-methyle Cilpoxyneodecanoate, t-hexyloxyneodecanoate, t-butylperoxybivalate, 1, 1, 3, 3—tetramethylbutylperoxy 2—ethylhexanoate, 2 , 5 Dimethyl-2,5 bis (2-ethylhexylberoxy) hexane, 1-cyclohexyl lumine 1 Methylethylperoxy 2-ethyl hexanoate, t-hexyloxy 2-ethyl hexanoate, t-butyl baroxy 2— Ethylhexanoate, t-butylperoxyisobutyrate, 1,1 bis (t-butylperoxy) cyclohe
- the peroxyketals include, for example, 1, 1 bis (t-hexyloxy) 3, 5, 5 trimethylcyclohexane, 1,1-bis (t-hexyloxy) cyclohexane, 1 , 1-bis (t-butylperoxy) 1,3,5,5 trimethylcyclohexane, 1,1- (t-butylperoxy) cyclododecane, 2,2-bis (t-butylperoxy) decane, and the like.
- dialkyl peroxides examples include ⁇ , ⁇ , bis (t butyl peroxide) diisopropylbenzene, dicumyl peroxide, 2,5 dimethyl-2,5 di (t butyl peroxide) hexane, and t butyl Tamperper.
- examples include oxides.
- hydride peroxide examples include diisopropylbenzene hydride baroxide and cumene hydride peroxide.
- curing agents that generate free radicals by heating or light can be used alone or in admixture of two or more, and can be used by mixing decomposition accelerators, inhibitors, etc. May be used.
- the (d) radical polymerizable substance is a substance having a functional group that is polymerized by radicals, and examples thereof include (meth) acrylate and maleimide compounds.
- Examples of (meth) acrylate include urethane (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, isobutyl (meth) acrylate, ethylene Glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, tetramethylol methane tetra (meth) acrylate, 2-hydroxy 1,1,3 Di (meth) atalyloxypropane, 2,2 bis [4 — ((meth) atarioxymethoxy) phenol] propan, 2,2 bis [4 — (((meth)) talyloxypolyethoxy ) Fuel] Propane, dicyclovente (meth) acrylate, tricyclodehydride (meth) attaly Rate
- Such radically polymerizable substances can be used singly or in combination of two or more. It is particularly preferred that the adhesive component contains at least a radically polymerizable substance that has a viscosity power of OOOOO to 1000000 mPa's at 25 ° C, especially 100000 to 5000 U, which preferably contains a radically polymerizable substance having a viscosity of OOmPa ⁇ s (25 ° C).
- the viscosity of the radically polymerizable substance can be measured using a commercially available E-type viscometer.
- radical polymerizable substances urethane (meth) acrylate is also preferable in terms of adhesiveness, and after crosslinking with an organic peroxide used to improve heat resistance, it is 100 ° C alone. It is particularly preferred to use in combination with a radical polymerizable substance exhibiting a Tg of C or higher.
- radically polymerizable substances include dicyclopentenyl group, tricyclodecanyl group and
- numerator can be used.
- a radically polymerizable substance having a tricyclodecane group or a triazine ring in the molecule is preferably used.
- Preferred maleimide compounds are those containing at least two maleimide groups in the molecule, such as 1-methyl 2,4-bismaleimide benzene, N, N, 1 m-phenylene bis.
- a polymerization inhibitor such as hydroquinone or methyl ether neuroquinone may be used as appropriate.
- the adhesive component 20 may contain a film-forming polymer. Based on the total mass of the adhesive component 20, the content of the film-forming polymer is preferably 2 to 80% by mass. More preferably, it is 5 to 70% by mass, and more preferably 10 to 60% by mass.
- Film-forming polymers include polystyrene, polyethylene, polyvinyl butyral, polyvinyl formal, polyimide, polyamide, polyester, polyvinyl chloride, polyphenylene oxide, urea resin, melamine resin, phenol resin, xylene resin. Fats, polyisocyanate resin, phenoxy resin, polyimide resin, polyester urethane resin, etc. are used.
- a resin having a functional group such as a hydroxyl group is more preferable because the adhesiveness can be improved.
- those obtained by modifying these polymers with radically polymerizable functional groups can also be used.
- the circuit connecting material 50 includes a filler, a softener, an accelerator, an anti-aging agent, a colorant, a flame retardant, a thixotropic agent, a coupling agent, a phenol resin, a melamine resin, and an isocyanine. It is also possible to contain gins.
- the maximum diameter is smaller than the particle diameter of the conductive particles, it can be used, and the range of 5 to 60% by volume is preferred. If it exceeds 60% by volume, the effect of improving reliability is saturated.
- a compound containing one or more groups selected from the group consisting of a vinyl group, an acrylic group, an amino group, an epoxy group, and an isocyanate group is preferable in terms of improving adhesiveness.
- the content of the conductive particles 10A in the circuit connection material 50 is preferably 0.1 to 30 parts by volume, where the total volume of the circuit connection material 50 is 100 parts by volume. Use more properly. In order to achieve high connection reliability, the content is more preferably 0.1 to 10 parts by volume.
- FIG. 5 is a cross-sectional view showing a state where the circuit connecting material 50 according to the present invention is provided on a film-like support 60.
- the support 60 include polyethylene terephthalate film (PET film), polyethylene naphthalate film, polyethylene isophthalate film, polybutylene terephthalate film, polyolefin film, polyacetate film, polycarbonate film, polyphenylene sulfide film, and polyamide. Film, ethylene acetate butyl copolymer film, polychlorinated bur film, poly salt Various films such as vinylidene fluoride film, synthetic rubber film, and liquid crystal polymer film can be used.
- a support having a corona discharge treatment, an anchor coat treatment, an antistatic treatment or the like may be used on the surface of the film as necessary.
- the surface of the support 60 is coated with a release treatment agent as necessary so that the support 60 can be easily peeled from the circuit connection material 50. Also good.
- a release treatment agent silicone resin, copolymer of silicone and organic resin, alkyd resin, aminoalkyd resin, resin having long alkyl group, resin having fluoroalkyl group, shellac resin Various release treatment agents such as can be used
- the film thickness of the support 60 is not particularly limited, but should be 4 to 200 / ⁇ ⁇ in consideration of storage of the produced circuit connection material 50, convenience during use, and the like. In consideration of material cost and productivity, the thickness is more preferably 15 to 75 ⁇ m.
- FIG. 6 is a process diagram schematically showing a cross-sectional view of an embodiment of a circuit member connection method according to the present invention.
- the connection structure is manufactured by thermosetting the circuit connection material.
- the circuit connecting material 50 is made of an adhesive composition containing the conductive particles 10A.
- the thickness of the circuit connecting material 50 is preferably 5 to 50 m. If the thickness of the circuit connecting material 50 is less than 5 m, the circuit connecting material 50 tends to be insufficiently filled between the first and second circuit electrodes 32 and 42. On the other hand, if it exceeds 50 / z m, the first and second circuit electrodes 32,
- circuit connection material 50 is placed on the surface of the first circuit member 30 on which the circuit electrodes 32 are formed. Then, the circuit connection material 50 is pressurized in the directions of arrows A and B in FIG. 5A, and the circuit connection material 50 is temporarily connected to the first circuit member 30 (FIG. 5B).
- the pressure at this time is not particularly limited as long as it does not damage the circuit member, but in general, it is preferably 0.1 to 30. OMPa. You can also pressurize while heating
- the heating temperature is a temperature at which the circuit connecting material 50 is not substantially cured. In general, the heating temperature is preferably 50 to 190 ° C. These heating and pressurization are preferably performed in the range of 0.5 to 120 seconds.
- the second circuit member 40 is placed on the circuit connection material 50 so that the second circuit electrode 42 faces the first circuit member 30 side. Put it on. Then, while heating the sheet-like circuit connecting material 50, the whole is pressed in the directions of arrows A and B in FIG.
- the heating temperature at this time is a temperature at which the circuit connecting material 50 can be cured.
- the heating temperature is preferably 60 to 180 ° C, and more preferably 80 to 160 ° C, more preferably 70 to 170 ° C. If the heating temperature is less than 60 ° C, the curing rate tends to be slow, and if it exceeds 180 ° C, unwanted side reactions tend to proceed.
- the heating time is preferably 0.1 to 180 seconds, more preferably 0.5 to 180 seconds, and still more preferably 1 to 180 seconds.
- the bonded portion 50a is formed by curing the circuit connection material 50, and a connection structure 100 as shown in FIG. 1 is obtained.
- the connection conditions are appropriately selected depending on the application to be used, the adhesive composition, and the circuit member.
- the circuit connection material 50 may be appropriately irradiated with actinic rays or energy rays.
- actinic rays or energy rays include ultraviolet light, visible light, and infrared light.
- energy rays include electron beams, X-rays, ⁇ rays, and microwaves.
- the core particle 1 composed of the base particle la and the conductive layer lb is illustrated, but the core particle is composed of a conductive material (for example, the same material as the conductive layer lb). It may be a thing.
- particles made of a hot-melt metal can be used as the core particles. In this case, the core particles can be sufficiently deformed by heating and pressurization.
- the conductive particles may be those in which both the insulating particles 2A and the insulating layer 2B are provided on the surface of the core particle 1 as an insulating coating.
- the sheet-like circuit connecting material may have a single layer structure or a multilayer structure in which a plurality of layers are laminated.
- Multi-layered circuit connection materials consist of adhesive components and conductive particle seeds. It can be manufactured by laminating a plurality of layers having different contents or different contents.
- the circuit connection material includes a conductive particle-containing layer containing conductive particles and a conductive particle-free layer that does not contain conductive particles and is provided on at least one surface of the conductive particle-containing layer. May be.
- FIG. 7 is a cross-sectional view showing a state in which the circuit connection material having a two-layer structure is supported by the support.
- the circuit connecting material 70 shown in FIG. 7 is composed of a conductive particle containing layer 70a containing conductive particles and a conductive particle non-containing layer 70b containing no conductive particles.
- Support members 60a and 60b are provided on both outermost surfaces of the circuit connecting material 70, respectively.
- the circuit connection material 70 forms a conductive particle-containing layer 70a on the surface of the support 60a, while forming a conductive particle-free layer 70b on the surface of the support 60b.
- These layers are used as a conventionally known laminator or the like. It can produce by bonding together using.
- the support bodies 60a and 60b are appropriately peeled off.
- the circuit connecting material 70 According to the circuit connecting material 70, the decrease in the number of conductive particles on the circuit electrode due to the flow of the adhesive component can be sufficiently suppressed when the circuit members are joined to each other. For this reason, for example, when the IC chip is connected to the substrate by COG mounting or COF mounting, the number of conductive particles on the metal bumps of the IC chip can be sufficiently secured.
- the circuit connecting material 70 is arranged so that the surface of the IC chip with the metal bumps and the conductive particle-free layer 70b are in contact with the substrate on which the IC chip is to be mounted and the conductive particle-containing layer 70a, respectively. I prefer to do it.
- Conductive core particles were produced as follows. Specifically, bridge polystyrene particles (product name: SX series, average particle size: 4 m) are prepared as base particles, and Ni layer ( A thickness of 0.08 ⁇ m) was provided. Furthermore, an Au layer (thickness 0.03 ⁇ m) was provided on the outside of the Ni layer by electroless plating to obtain core particles having a conductive layer composed of the Ni layer and the Au layer.
- phenoxy resin having a glass transition temperature of 80 ° C was synthesized using bisphenol A type epoxy resin and 9, 9, 1-bis (4-hydroxyphenol) fluorene. 50 g of this phenoxy resin was dissolved in a solvent to prepare a solution having a solid content of 40% by mass.
- the above solution and epoxy resin are mixed so that 40 g (solid content) of phenoxy resin and 60 g (solid content) of liquid epoxy resin containing a microcapsule-type latent curing agent are blended. Combined.
- the adhesive composition solution was prepared by blending 5 parts by volume of the conductive particles with 100 parts by volume of the adhesive component solution thus obtained, and stirring and dispersing at a temperature of 23 ° C.
- Adhesive composition on the surface of a PET film (trade name: Purex, thickness: 50 m) manufactured by Teijin DuPont Films Co., Ltd., which has been surface-treated with a release treatment (silicone resin) A solution of the product was applied and applied. Thereafter, this was hot-air dried (at 80 ° C. for 5 minutes) to obtain a conductive particle-containing layer having a thickness of 10 m supported by a PET film.
- the solution of the adhesive component prepared in the same manner as described above was applied to a PET film and applied. Thereafter, this was hot-air dried (at 80 ° C. for 5 minutes) to obtain a conductive particle-free layer having a thickness of 10 m supported by a PET film.
- an ITO substrate surface resistance: 20 ⁇ / ⁇
- an IC chip was connected to form a connection structure.
- the IC chip used was a gold bump with an area of 2500 ⁇ (50 ⁇ m x 50 m), a pitch of 100 ⁇ m, and a height of 20 ⁇ m.
- ITO The substrate used was a glass plate with a thickness of 1.1 mm formed by depositing ITO on the surface.
- a circuit connection material was interposed between the IC chip and the ITO substrate, and a connection was made using a crimping apparatus (trade name: FC-1200, manufactured by Toray Engineering Co., Ltd.). Specifically, first, the PET film on the conductive particle-containing layer side was peeled off, and the circuit connection material was placed on the ITO substrate so that the conductive particle-containing layer was in contact with the ITO substrate. Then, temporary pressure bonding (temperature 75 ° C, pressure 1. OMPa for 2 seconds) was performed using a crimping apparatus. Then, after peeling off the PET film on the conductive particle-free layer side, the IC chip was placed so that the gold bumps were in contact with the conductive particle-free layer. Quartz glass was used as the base, and a connection structure with a connection part was obtained by heating and pressing at a temperature of 210 ° C and a pressure of 80 MPa for 5 seconds.
- FC-1200 manufactured by Toray Engineering Co., Ltd.
- the initial resistance of the connection part of the connection structure produced as described above was measured using a resistance measuring machine (trade name: Digital Multimeter, manufactured by Advantest Corporation). The measurement was performed with a current of 1 mA flowing between the electrodes.
- the insulation resistance between adjacent electrodes was measured using a resistance measuring instrument (trade name: Digital Multimeter, manufactured by Advantest Co., Ltd.) according to the following procedure.
- a direct current (DC) voltage of 50 V was applied to the connection part of the connection structure for 1 minute.
- the insulation resistance was measured by the two-terminal measurement method for the connection part after voltage application.
- a voltmeter manufactured by Advantest Co., Ltd., trade name: ULTRA HIGH RESISTANCE MET ER was used to apply the voltage.
- connection structure is housed in a temperature cycle bath (ETAC, product name: NT1020), the temperature is lowered from ⁇ 40 ° C to ⁇ 40 ° C, and the temperature is raised from ⁇ 40 ° C to 100 ° C. This was carried out by repeating the temperature cycle from 100 ° C. to room temperature 500 times. The holding times at 40 ° C and 100 ° C were both 30 minutes.
- the connection resistance after the temperature cycle test was measured in the same manner as the initial resistance measurement. [0126] Together with the coverage of conductive particles and the degree of crosslinking of the organic polymer compound constituting the insulating coating
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%) Then, conductive particles having the structure shown in FIG. 3 were produced.
- the processing conditions in the hybridizer were a rotation speed of 16000Z and a reaction vessel temperature of 60 ° C. The coverage of the conductive particles was 30%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 13%, gel fraction: 10%)
- conductive particles having the structure shown in Fig. 3 were produced.
- the treatment conditions in the hybridizer were a rotation speed of 16000Z and a reaction vessel temperature of 60 ° C. The coverage of the conductive particles was 35%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- Example 2 That is, the same core particles and crosslinked acrylic resin as those prepared in Example 1 were introduced into a hybridizer to produce conductive particles. Preparation weight of core particles and conductive particles, c By appropriately adjusting the rotation speed and reaction vessel temperature of the hybridizer, conductive particles having the structure shown in FIG. 4 were obtained. The coverage of the conductive particles was 25%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%)
- a crosslinked acrylic resin manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer containing the same core particles as those prepared in Example 1 and a crosslinked acrylic resin manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 13%, gel fraction: 10%
- a crosslinked acrylic resin manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 13%, gel fraction: 10%
- the circuit connection material and the connection structure were the same as in Example 1 except that the core particles were used in place of the conductive particles having the insulating coating without forming the insulating coating on the surface of the core particles. Produced.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%) Then, conductive particles having the structure shown in FIG. 3 were produced.
- the process in the hybridizer The conditions were such that the rotation speed was 16000Z and the reactor temperature was 60 ° C. The coverage of the conductive particles was 10%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those produced in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%) Then, conductive particles having the structure shown in FIG. 3 were produced.
- the processing conditions in the hybridizer were a rotation speed of 16000Z and a reaction vessel temperature of 60 ° C. The coverage of the conductive particles was 50%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those produced in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 3%, gel fraction: 2%) Then, conductive particles having a structure as shown in FIG. 3 were produced.
- the treatment conditions in the hybridizer were a rotation speed of 16000Z and a reaction vessel temperature of 60 ° C. The coverage of the conductive particles was 50%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 20%, gel fraction: 18%) Then, conductive particles having the structure shown in Fig. 3 were produced.
- the treatment conditions in the hybridizer were a rotation speed of 16000Z and a reaction vessel temperature of 60 ° C. The coverage of the conductive particles was 25%.
- Example 1 except that an insulating coating was formed on the surface of the core particle as follows. In this way, conductive particles, a circuit connection material and a connection structure were produced.
- a hybridizer comprising the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 10%, gel fraction: 8%) Introduced.
- the charged weights of the core particles and conductive particles, the rotational speed of the hybridizer, and the reaction vessel temperature were appropriately adjusted to obtain conductive particles having a structure as shown in FIG.
- the coverage of the conductive particles was 10%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer containing the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 3%, gel fraction: 2%) Introduced.
- the charged weight of the core particles and the conductive particles, the rotational speed of the hybridizer, and the reaction vessel temperature were appropriately adjusted to obtain conductive particles having a structure as shown in FIG.
- the coverage of the conductive particles was 50%.
- Conductive particles, circuit connection materials, and connection structures were produced in the same manner as in Example 1 except that an insulating coating was formed on the surface of the core particles as described below.
- a hybridizer containing the same core particles as those prepared in Example 1 and a crosslinked acrylic resin (manufactured by Soken Chemical Co., Ltd., trade name: MP series, degree of crosslinking: 20%, gel fraction: 18%) was introduced.
- the charged weight of the core particles and the conductive particles, the rotational speed of the hybridizer, and the reaction vessel temperature were appropriately adjusted to obtain conductive particles having a structure as shown in FIG.
- the coverage of the conductive particles was 25%.
- Tables 1 to 4 show parameters related to the conductive particles produced in Examples 2 to 7 and Comparative Examples 1 to 8. Tables 1 to 4 also show the results of various measurements performed in the same manner as in Example 1.
- connection structure in which circuit members are connected using the circuit connection material described above, and a circuit member connection method for obtaining the connection structure.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/307,564 US20100065311A1 (en) | 2006-07-03 | 2007-04-10 | Conductive particle, adhesive composition, circuit-connecting material, circuit-connecting structure, and method for connection of circuit member |
EP07741414A EP2040268A4 (en) | 2006-07-03 | 2007-04-11 | CONDUCTIVE PARTICLE, ADHESIVE COMPOSITION, CIRCUIT CONNECTION MATERIAL, CIRCUIT CONNECTION STRUCTURE, AND METHODS OF CONNECTING CIRCUIT MEMBER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006183619A JP4967482B2 (ja) | 2006-02-27 | 2006-07-03 | 導電粒子、接着剤組成物及び回路接続材料 |
JP2006-183619 | 2006-07-03 |
Publications (1)
Publication Number | Publication Date |
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WO2008004367A1 true WO2008004367A1 (en) | 2008-01-10 |
Family
ID=38894341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/057978 WO2008004367A1 (en) | 2006-07-03 | 2007-04-11 | Conductive particle, adhesive composition, circuit-connecting material, circuit-connecting structure, and method for connection of circuit member |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100065311A1 (ja) |
EP (1) | EP2040268A4 (ja) |
KR (1) | KR101078157B1 (ja) |
CN (1) | CN101484950A (ja) |
WO (1) | WO2008004367A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5412357B2 (ja) * | 2010-04-01 | 2014-02-12 | 株式会社フジクラ | メンブレン配線板 |
JP5435040B2 (ja) * | 2010-04-01 | 2014-03-05 | 株式会社村田製作所 | 電子部品及びその製造方法 |
WO2012002508A1 (ja) * | 2010-07-02 | 2012-01-05 | 積水化学工業株式会社 | 絶縁性粒子付き導電性粒子、異方性導電材料及び接続構造体 |
KR101161360B1 (ko) * | 2010-07-13 | 2012-06-29 | 엘에스전선 주식회사 | 공간전하 저감 효과를 갖는 직류용 전력 케이블 |
CN102136313B (zh) * | 2010-12-06 | 2013-07-24 | 苏州纳微生物科技有限公司 | 一种复合微球及各向异性导电材料和各向异性导电膜与导电结构 |
TWI602198B (zh) * | 2012-01-11 | 2017-10-11 | 日立化成股份有限公司 | 導電粒子、絕緣被覆導電粒子以及異向導電性接著劑 |
CN104701223B (zh) * | 2015-03-24 | 2018-02-13 | 京东方科技集团股份有限公司 | 一种芯片压合设备 |
CN107851482B (zh) * | 2016-02-08 | 2020-03-20 | 积水化学工业株式会社 | 导电性粒子、导电材料及连接结构体 |
JP2018145418A (ja) * | 2017-03-06 | 2018-09-20 | デクセリアルズ株式会社 | 樹脂組成物、樹脂組成物の製造方法、及び構造体 |
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- 2007-04-11 WO PCT/JP2007/057978 patent/WO2008004367A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
KR101078157B1 (ko) | 2011-10-28 |
EP2040268A4 (en) | 2010-07-14 |
KR20090027753A (ko) | 2009-03-17 |
CN101484950A (zh) | 2009-07-15 |
US20100065311A1 (en) | 2010-03-18 |
EP2040268A1 (en) | 2009-03-25 |
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