WO2013089061A1 - 導電性接着剤、及び電子部品の接続方法 - Google Patents
導電性接着剤、及び電子部品の接続方法 Download PDFInfo
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- WO2013089061A1 WO2013089061A1 PCT/JP2012/081931 JP2012081931W WO2013089061A1 WO 2013089061 A1 WO2013089061 A1 WO 2013089061A1 JP 2012081931 W JP2012081931 W JP 2012081931W WO 2013089061 A1 WO2013089061 A1 WO 2013089061A1
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- Prior art keywords
- solder particles
- electronic component
- organic peroxide
- temperature
- minute half
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Classifications
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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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
-
- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- 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
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
-
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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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
- 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
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
-
- 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
- C09J2433/00—Presence of (meth)acrylic polymer
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
- H05K2203/0425—Solder powder or solder coated metal powder
Definitions
- the present invention relates to a conductive adhesive in which conductive particles are dispersed and a method for connecting an electronic component using the same.
- an organic film decomposing component such as an acid component is blended in the anisotropic conductive adhesive film (see, for example, Patent Document 1), and preflux is washed and removed with trichloroethane or the like before pressure bonding. (For example, refer to Patent Document 2) and the like have been proposed.
- the present invention has been proposed in view of such conventional circumstances, and provides a conductive adhesive capable of obtaining good conduction to a prefluxed substrate, and a method for connecting electronic components. To do.
- solder particles As a result of intensive studies, the present inventors have used solder particles as conductive particles, and by using an organic peroxide having a half-life temperature of 1 minute lower than the solidus temperature of the solder particles as a polymerization initiator, It has been found that good electrical continuity can be obtained for a prefluxed substrate.
- the conductive adhesive according to the present invention contains a polymerizable acrylic compound, an organic peroxide, and solder particles, and the one-minute half-life temperature of the organic peroxide is the solidity of the solder particles. It is characterized by being lower than the phase line temperature.
- the electronic component connection method includes a film-forming resin, a polymerizable acrylic compound, an organic peroxide, and solder particles, and the organic peroxide has a one-minute half-life temperature.
- a conductive adhesive having a temperature lower than the solidus temperature of the solder particles is sandwiched between the electrode of the first electronic component and the electrode of the second electronic component that have been prefluxed, and the first electronic component and the second electronic component
- the second electronic component is thermocompression bonded to electrically connect the electrode of the first electronic component and the electrode of the second electronic component.
- the one-minute half-life temperature of the organic peroxide is lower than the solidus temperature of the solder particles, so that the solder particles are crushed and the oxide film is removed at the time of thermocompression bonding.
- the preflux layer on the bump surface is removed and conduction is ensured, and then the adhesive component is completely cured.
- favorable conduction can be obtained with respect to the substrate subjected to the preflux treatment.
- the conductive adhesive in this embodiment is a thermosetting adhesive main component comprising a polymerizable acrylic compound that initiates radical polymerization with an organic peroxide in order to lower the curing temperature at the time of connection and shorten the tact time. It is what.
- the conductive adhesive in the present embodiment contains a film-forming resin, a polymerizable acrylic compound, an organic peroxide, and conductive particles.
- thermoplastic elastomer such as phenoxy resin, epoxy resin, polyester resin, polyurethane resin, polyamide, EVA, or the like can be used.
- a phenoxy resin synthesized from bisphenol A and epichlorohydrin can be preferably used for heat resistance and adhesiveness.
- resin solids polymerization acrylic compound and film formation 80 to 30% by mass, more preferably 70 to 40% by mass, based on the total amount of the resin.
- Polymerizable acrylic compounds include polyethylene glycol diacrylate, phosphate ester acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, isobutyl acrylate, t-butyl acrylate, isooctyl acrylate, bis Phenoxyethanol full orange acrylate, 2-acryloyloxyethyl succinic acid, lauryl acrylate, stearyl acrylate, isobornyl acrylate, tricyclodecane dimethanol dimethacrylate, cyclohexyl acrylate, tris (2-hydroxyethyl) isocyanurate triacrylate, tetrahydrofur Furyl acrylate, o-phthalic acid diglycidyl ether acrylate, ethoxy Bisphenol A dimethacrylate, bisphenol A type epoxy acrylate, urethane acrylate, epoxy acrylate, and can be given the corresponding (meth) acryl
- the amount of the polymerizable acrylic compound used is too small, the conduction reliability will be low, and if it is too large, the adhesive strength will be low, and there is a tendency that a film cannot be formed.
- Organic peroxides include di (4-methylbenzoyl) peroxide (1 minute half-life temperature 128.2 ° C), di (3-methylbenzoyl) peroxide (1 minute half-life temperature 131.1 ° C), dibenzoyl Peroxide (1 minute half-life temperature 130.0 ° C), t-hexyl peroxybenzoate (1 minute half-life temperature 160.3 ° C), t-butyl peroxybenzoate (1 minute half-life temperature 166.8 ° C), Diisobutyryl-peroxide (1-minute half-life temperature 85.1 ° C), 1,1,3,3-tetramethylbutyl-peroxy-2-ethylhexanoate (1-minute half-life temperature 124.3 ° C), dilauroyl-peroxide ( 1 minute half-life temperature 116.4 ° C), di (3,5,5-trimethylhexanoyl) peroxide (1 minute Half-life temperature 112.6 ° C), t-butyl peroxypivalate (1 minute half
- the amount of the organic peroxide used is preferably 1 with respect to 100 parts by mass of the polymerizable acrylic compound. -10 parts by mass, more preferably 3-7 parts by mass.
- the one-minute half-life temperature of the organic peroxide is lower than the solidus temperature of the solder particles. More preferably, the one-minute half-life temperature of the organic peroxide is lower by 0 ° C. or more and 20 ° C. or less than the solidus temperature of the solder particles.
- the resin will not cure even if the solder particles melt, so good conduction to the prefluxed substrate I can't get it. Also, if the half-life temperature for 1 minute is lower than the solidus temperature of the solder particles by more than 20 ° C., the curing reaction of the conductive adhesive proceeds too quickly during thermocompression bonding. Conduction becomes difficult.
- the 1 minute half-life temperature of the organic peroxide is preferably 160 ° C. or less. As a result, good conduction can be obtained under thermocompression bonding conditions at a low temperature and low pressure of 200 ° C. or lower and 2 to 3 MPa.
- Sn (47) -Bi (53) system solidus temperature: 139 ° C.
- Sn (49) -In (34) -Pb (17) system from the viewpoint of lowering the curing temperature
- Sn (22) -Bi (50) -Pb (28) system solidus temperature: 124 ° C.
- Sn (48) -In (52) system solidus temperature: Those having a low melting point such as 117 ° C. are preferably used.
- the amount of solder particles used is too small, the possibility of poor conduction increases, and if it is too large, there is an increased possibility of short-circuiting. More preferably, it is 0.2 to 10 parts by mass.
- the average particle size of the solder particles is usually 1 to 15 ⁇ m, more preferably 5 to 10 ⁇ m.
- diluting monomers such as various acrylic monomers, fillers, softeners, colorants, flame retardants, thixotropes A tropic agent, a coupling agent, etc. can be contained.
- the conductive adhesive having such a structure removes the oxide film because the one-minute half-life temperature of the organic peroxide is lower than the solidus temperature of the solder particles, so that the solder particles are crushed during thermocompression bonding.
- the pre-flux layer on the bump surface is removed by melting and flowing, and after conduction is secured, the adhesive component is completely cured, so that good conduction to the pre-flux-treated substrate is achieved. Obtainable.
- the one minute half-life temperature of the organic peroxide is lower by 0 ° C. or more and 20 ° C. or less than the solidus temperature of the solder particles, good conduction can be obtained under low pressure thermocompression bonding conditions. Furthermore, when the one-minute half-life temperature of the organic peroxide is 160 ° C. or lower, specifically, 80 ° C. or higher and 160 ° C. or lower, it is good at 200 ° C. or lower and 2 to 3 MPa low temperature / low pressure thermocompression bonding conditions. Conductivity can be obtained.
- a composition containing a film-forming resin, a polymerizable acrylic compound, an organic peroxide, and solder particles is applied onto a release substrate. It has an application
- the organic peroxide having a one-minute half-life temperature lower than the solidus temperature of the solder particles is blended and adjusted using an organic solvent, and then the composition is peeled off. It is coated on top using a bar coater, coating device or the like.
- the organic solvent toluene, ethyl acetate, or a mixed solvent thereof, and other various organic solvents can be used.
- the release substrate is made of, for example, a laminated structure in which a release agent such as silicone is applied to PET (Poly Ethylene Terephthalate), OPP (Oriented Polypropylene), PMP (Poly-4-methlpentene-1), PTFE (Polytetrafluoroethylene), and the like. And maintaining the film shape of the composition.
- the composition on the release substrate is dried by a heat oven, a heat drying apparatus or the like.
- the anisotropic conductive film in which the conductive adhesive mentioned above was formed in the film form can be obtained.
- a method for connecting an electronic component as a specific example includes a film-forming resin, a polymerizable acrylic compound, an organic peroxide, and solder particles, and the half-life temperature of the organic peroxide is 1 minute.
- the first electronic component and the second electronic component are sandwiched between the electrode of the first electronic component and the electrode of the second electronic component that have been prefluxed with a conductive adhesive lower than the solidus temperature of the first electronic component.
- the electrode of the first electronic component and the electrode of the second electronic component are electrically connected.
- the second electronic component may be prefluxed or not prefluxed.
- the first electronic component and the second electronic component are thermocompression bonded at a temperature that is 5 ° C. or more higher than the solidus temperature of the solder particles, specifically, 5 ° C. or more and 30 ° C. or less.
- the solder particles are crushed, the oxide film is removed, and the preflux layer on the bump surface can be removed by melting and flowing.
- the adhesive component can be completely cured.
- the solder particles are sufficiently crushed even at a low pressure.
- the preflux layer on the bump surface can be removed by melting and flowing.
- the one-minute half-life temperature of the organic peroxide is 160 ° C. or less
- good conduction can be obtained under the low temperature and low pressure thermocompression bonding conditions of 200 ° C. or less and 2 to 3 MPa.
- the first electrical component is a liquid crystal panel, a printed wiring board (PWB), etc.
- the second electrical component is flexible. It can be preferably applied to a printed circuit board, a tape carrier package (TCP) board, a chip-on-film (COF) board, and the like. Moreover, it can also use for the connection of the electrode of a photovoltaic cell and a tab wire in a photovoltaic module.
- connection body connected by the conductive adhesive of the present embodiment is connected by the solder particles as the conductive particles, it has high connection reliability.
- an acrylic thermosetting conductive adhesive film containing solder particles having a predetermined solidus temperature and an organic peroxide having a predetermined 1 minute half-life temperature was produced.
- substrate and the flexible substrate which were preflux-processed using this conductive adhesive film were connected, and conduction
- Example 1 (Preparation of anisotropic conductive film) 38 parts by mass of phenoxy resin (trade name: YP50, manufactured by Toto Kasei Co., Ltd.), 20 parts by mass of urethane acrylate (trade name: MP1600, manufactured by Toa Gosei Co., Ltd.), bifunctional acrylic monomer (trade name: DCP, Shin Nakamura Chemical Co., Ltd.) 20 parts by mass, monofunctional acrylic monomer (trade name: A-SA, Shin-Nakamura Chemical Co., Ltd.) 10 parts by mass, organic peroxide (trade name: Nyper BW, manufactured by NOF Corporation, 1 minute half-life) 3 parts by mass of temperature (130 ° C.), 2 parts by mass of silica (trade name: RY200, manufactured by Nippon Aerosil Co., Ltd.), 10 parts by mass of rubber component (trade name: JER-91, manufactured by Japan Epoxy Resin Co., Ltd.), silane cup A resin composition was prepared by blending 1 part by
- This resin composition was dissolved and mixed in 100 parts by mass of toluene, and then applied to the peeled PET using a bar coater, dried in an oven at 60 ° C. for 10 minutes, and an anisotropic conductive film having a thickness of 30 ⁇ m. A film was prepared.
- Solder particles (solidus temperature: 139 ° C.) were produced as follows. An alloy in which Sn and Bi were melted (Sn: 47%, Bi: 53%) was sprayed into water from a predetermined nozzle and rapidly solidified by a water atomization method to obtain solder particles having an average particle size of 10 ⁇ m.
- a rigid substrate subjected to preflux treatment also referred to as OSP (Organic Solderability Preservative) treatment
- a flexible substrate obtained by Sn plating treatment of Cu wiring with a pitch of 200 ⁇ m were connected under predetermined conditions using the anisotropic conductive film.
- the preflux treatment is performed by immersing the rigid substrate in a water-soluble preflux (trade name: F2LX, manufactured by Shikoku Kasei Co., Ltd.) at 25 to 40 ° C. for 3 to 5 minutes, and then reflowing the rigid substrate at a peak top of 260 ° C. Passed 3 times.
- the conduction resistance at the initial stage and after the temperature cycle test (TCT: ⁇ 55 ° C., 15 minutes ⁇ ⁇ 125 ° C., 1000 cycles for 15 minutes) was measured by the 4-terminal method. A case where both the initial conduction resistance and the conduction resistance after TCT were 0.5 ⁇ or less was evaluated as ⁇ , and the others were evaluated as ⁇ .
- Example 2 (Preparation of anisotropic conductive film) An anisotropic conductive film of Example 2 in the same manner as in Example 1 except that the organic peroxide (trade name: Parroyl L, manufactured by NOF Corporation, 1 minute half-life temperature: 116 ° C.) was changed to 3 parts by mass. Was made.
- organic peroxide trade name: Parroyl L, manufactured by NOF Corporation, 1 minute half-life temperature: 116 ° C.
- connection reliability evaluation structure The evaluation of the conduction resistance of the connection structure that was thermocompression bonded under the conditions of 145 ° C., 2 MPa, and 10 seconds using the anisotropic conductive film of Example 2 was x. Moreover, evaluation of the conduction resistance of the connection structure thermocompression-bonded on condition of 145 degreeC, 5 Mpa, and 10 second using the anisotropic conductive film of Example 2 was (circle). Table 1 shows the evaluation results of the conduction resistance.
- Example 3 (Preparation of anisotropic conductive film)
- the solidus temperature was 5 parts by mass of solder particles at 130 ° C., and 3 parts by mass of organic peroxide having a 1 minute half-life temperature of 116 ° C. (trade name: Parroyl L, manufactured by NOF Corporation),
- An anisotropic conductive film of Example 3 was produced in the same manner as Example 1.
- Solder particles (solidus temperature: 130 ° C.) were produced as follows. An alloy in which Sn, In, and Pb are melted (Sn: 49%, In: 34%, Pb: 17%) is sprayed into water from a predetermined nozzle and rapidly solidified by water atomization, and the average particle size is 10 ⁇ m. Solder particles were obtained.
- connection reliability evaluation structure The evaluation of the conduction resistance of the connection structure that was thermocompression bonded using the anisotropic conductive film of Example 3 under the conditions of 135 ° C., 2 MPa, and 10 seconds was “good”. Table 1 shows the evaluation results of the conduction resistance.
- Example 4 (Preparation of anisotropic conductive film)
- the solidus temperature is 5 parts by mass of solder particles at 130 ° C. and 3 parts by mass of organic peroxide (trade name: Parroyl TCP, manufactured by NOF Corporation) with a 1 minute half-life temperature of 92 ° C.
- An anisotropic conductive film of Example 4 was produced in the same manner as Example 1.
- connection reliability evaluation structure The evaluation of the conduction resistance of the connection structure that was thermocompression bonded using the anisotropic conductive film of Example 4 under the conditions of 135 ° C., 2 MPa, and 10 seconds was x. Moreover, evaluation of the conduction resistance of the connection structure which carried out the thermocompression bonding on the conditions of 135 degreeC, 5 Mpa, and 10 second using the anisotropic conductive film of Example 2 was (circle). Table 1 shows the evaluation results of the conduction resistance.
- connection reliability evaluation structure The evaluation of the conduction resistance of the connection structure that was thermocompression bonded under the conditions of 145 ° C., 2 MPa, and 10 seconds using the anisotropic conductive film of Comparative Example 1 was x. Table 1 shows the evaluation results of the conduction resistance.
- Reference Example 1 (Preparation of anisotropic conductive film)
- the anisotropic conductive material of Reference Example 1 was used in the same manner as in Example 1 except that 5 parts by mass of resin particles (Nihon Kagaku, average particle size 10 ⁇ m) subjected to Ni / Au plating were used instead of the solder particles. A film was prepared.
- connection reliability evaluation structure The evaluation of the conduction resistance of the connection structure that was thermocompression bonded using the anisotropic conductive film of Reference Example 1 under the conditions of 145 ° C., 2 MPa, and 10 seconds was x. In addition, the evaluation of the conduction resistance of the connection structure that was thermocompression bonded under the conditions of 145 ° C., 2 MPa, and 10 seconds using a rigid substrate that was not prefluxed was “good”. Table 1 shows the evaluation results of the conduction resistance.
- Example 1 when the solder particles are crushed by thermocompression bonding at a temperature higher than the solidus temperature of the solder particles by 5 ° C. or more, a part of the solder particles is removed together with the removal of the preflux. It can be melted and the solder wettability can be improved by the flux of the substrate.
- Comparative Example 1 when an anisotropic conductive film in which the half-life temperature of the organic peroxide is 1 minute higher than the solidus temperature of the solder particles is used, the curing of the resin does not proceed, so that it is good. Continuity is not obtained.
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Wire Bonding (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Adhesive Tapes (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Conductive Materials (AREA)
- Non-Insulated Conductors (AREA)
Abstract
Description
1.導電性接着剤
2.電子部品の接続方法
3.実施例
本実施の形態における導電性接着剤は、接続時の硬化温度の低温化、タクトタイムの短縮化のため、有機過酸化物でラジカル重合を開始する重合性アクリル系化合物を熱硬化性接着主成分とするものである。
次に、導電性接着剤を用いた電子部品の接続方法について説明する。具体例として示す電子部品の接続方法は、膜形成樹脂と、重合性アクリル系化合物と、有機過酸化物と、はんだ粒子とを含有し、有機過酸化物の1分間半減期温度が、はんだ粒子の固相線温度より低い導電性接着剤を、プリフラックス処理された第1の電子部品の電極と第2の電子部品の電極との間に挟み、第1の電子部品と第2の電子部品とを熱圧着し、第1の電子部品の電極と、第2の電子部品の電極とを電気的に接続する。なお、第2の電子部品は、プリフラックス処理されていても、プリフラックス処理されていなくても構わない。
以下、実施例を挙げて、本発明を具体的に説明するが、本発明は、これらの実施例に限定されるものではない。ここでは、所定の固相線温度を有するはんだ粒子と、所定の1分間半減期温度を有する有機過酸化物とを含むアクリル系熱硬化型の導電性接着フィルムを作製した。そして、この導電性接着フィルムを用いてプリフラックス処理されたリジット基板とフレキシブル基板とを接続させ、導通抵抗を評価した。
(異方性導電フィルムの作製)
フェノキシ樹脂(商品名:YP50、東都化成社製)を38質量部、ウレタンアクリレート(商品名:MP1600、東亜合成社製)を20質量部、2官能アクリルモノマー(商品名:DCP、新中村化学社製)を20質量部、単官能アクリルモノマー(商品名:A-SA、新中村化学社製)を10質量部、有機過酸化物(商品名:ナイパーBW、日本油脂社製、1分間半減期温度:130℃)を3質量部、シリカ(商品名:RY200、日本アエロジル社製)を2質量部、ゴム成分(商品名:JER-91、ジャパンエポキシレジン社製)を10質量部、シランカップリング剤(商品名:KMB503、信越化学工業社製)を1質量部、及び平均粒径10μmのはんだ粒子(固相線温度:139℃)を5質量部配合し、樹脂組成物を調製した。
プリフラックス処理(OSP(Organic Solderability Preservative)処理とも呼ぶ。)したリジット基板と、200μmピッチのCu配線をSnめっき処理したフレキシブル基板とを上記異方性導電フィルムを用いて所定の条件で接続した。プリフラックス処理は、リジット基板を25~40℃の水溶性プリフラックス(商品名:F2LX、四国化成社製)中に3~5分間浸漬させた後、このリジット基板をピークトップ260℃のリフローを3回Passさせた。
(異方性導電フィルムの作製)
有機過酸化物(商品名:パーロイルL、日本油脂社製、1分間半減期温度:116℃)を3質量部とした以外は、実施例1と同様にして実施例2の異方性導電フィルムを作製した。
実施例2の異方性導電フィルムを用いて、145℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は×であった。また、実施例2の異方性導電フィルムを用いて、145℃、5MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は○であった。表1に導通抵抗の評価結果を示す。
(異方性導電フィルムの作製)
固相線温度は130℃のはんだ粒子を5質量部、及び1分間半減期温度が116℃の有機過酸化物(商品名:パーロイルL、日本油脂社製)を3質量部とした以外は、実施例1と同様にして実施例3の異方性導電フィルムを作製した。
実施例3の異方性導電フィルムを用いて、135℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は○であった。表1に導通抵抗の評価結果を示す。
(異方性導電フィルムの作製)
固相線温度は130℃のはんだ粒子を5質量部、及び1分間半減期温度が92℃の有機過酸化物(商品名:パーロイルTCP、日本油脂社製)を3質量部とした以外は、実施例1と同様にして実施例4の異方性導電フィルムを作製した。
実施例4の異方性導電フィルムを用いて、135℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は×であった。また、実施例2の異方性導電フィルムを用いて、135℃、5MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は○であった。表1に導通抵抗の評価結果を示す。
(異方性導電フィルムの作製)
1分間半減期温度が153℃の有機過酸化物(商品名:パーテトラA、日本油脂社製)を3質量部とした以外は、実施例1と同様にして比較例1の異方性導電フィルムを作製した。
比較例1の異方性導電フィルムを用いて、145℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は×であった。表1に導通抵抗の評価結果を示す。
(異方性導電フィルムの作製)
はんだ粒子に代えて、Ni・Auめっきが施された樹脂粒子(日本化学製、平均粒径10μm)を5質量部とした以外は、実施例1と同様にして参照例1の異方性導電フィルムを作製した。
参照例1の異方性導電フィルムを用いて、145℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は×であった。また、プリフラックス処理していないリジット基板を用いて、145℃、2MPa、10秒という条件で熱圧着した接続構造体の導通抵抗の評価は○であった。表1に導通抵抗の評価結果を示す。
Claims (6)
- 重合性アクリル系化合物と、有機過酸化物と、はんだ粒子とを含有し、
前記有機過酸化物の1分間半減期温度が、前記はんだ粒子の固相線温度より低い導電性接着剤。 - 前記有機過酸化物の1分間半減期温度が、前記はんだ粒子の固相線温度より0℃以上20℃以下低い請求項1記載の導電性接着剤。
- 前記有機過酸化物の1分間半減期温度が、160℃以下である請求項1又は2記載の導電性接着剤。
- 膜形成樹脂と、重合性アクリル系化合物と、有機過酸化物と、はんだ粒子とを含有し、前記有機過酸化物の1分間半減期温度が、前記はんだ粒子の固相線温度より低い導電性接着剤を、プリフラックス処理された第1の電子部品の電極と第2の電子部品の電極との間に挟み、第1の電子部品と第2の電子部品とを熱圧着し、第1の電子部品の電極と、第2の電子部品の電極とを電気的に接続する電子部品の接続方法。
- 前記第1の電子部品と前記第2の電子部品とを前記はんだ粒子の固相線温度より5℃以上高い温度で熱圧着する請求項4記載の電子部品の接続方法。
- 前記第1の電子部品と前記第2の電子部品とを2~3MPaの圧力で熱圧着する請求項4又は5記載の電子部品の接続方法。
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JP2016035044A (ja) * | 2014-06-03 | 2016-03-17 | 太陽インキ製造株式会社 | 導電性接着剤および電子部品 |
JP6280017B2 (ja) * | 2014-10-03 | 2018-02-14 | デクセリアルズ株式会社 | 異方性導電フィルム、並びに、接続方法及び接合体 |
JP6510846B2 (ja) * | 2015-03-24 | 2019-05-08 | デクセリアルズ株式会社 | 異方性導電フィルム、接続方法、及び接合体 |
JPWO2022102672A1 (ja) * | 2020-11-12 | 2022-05-19 | ||
WO2024111481A1 (ja) * | 2022-11-24 | 2024-05-30 | デクセリアルズ株式会社 | 異方性導電膜、電子部品の製造方法、及びカード積層体 |
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US9752058B2 (en) | 2017-09-05 |
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