WO2014030744A1 - 異方性導電フィルム及びその製造方法 - Google Patents
異方性導電フィルム及びその製造方法 Download PDFInfo
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- WO2014030744A1 WO2014030744A1 PCT/JP2013/072571 JP2013072571W WO2014030744A1 WO 2014030744 A1 WO2014030744 A1 WO 2014030744A1 JP 2013072571 W JP2013072571 W JP 2013072571W WO 2014030744 A1 WO2014030744 A1 WO 2014030744A1
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- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/838—Bonding techniques
- H01L2224/8385—Bonding techniques using a polymer adhesive, e.g. an adhesive based on silicone, epoxy, polyimide, polyester
- H01L2224/83851—Bonding techniques using a polymer adhesive, e.g. an adhesive based on silicone, epoxy, polyimide, polyester being an anisotropic conductive adhesive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12042—LASER
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/156—Material
- H01L2924/15786—Material with a principal constituent of the material being a non metallic, non metalloid inorganic material
- H01L2924/15788—Glasses, e.g. amorphous oxides, nitrides or fluorides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0203—Fillers and particles
- H05K2201/0206—Materials
- H05K2201/0215—Metallic fillers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
Definitions
- the present invention relates to an anisotropic conductive film and a method for producing the same.
- Anisotropic conductive films are widely used for mounting electronic components such as IC chips.
- Anisotropic conductive films are widely used for mounting electronic components such as IC chips.
- an anisotropic conductive film in which conductive particles for anisotropic conductive connection are arranged in a single layer on an insulating adhesive layer has been proposed (Patent Document 1).
- This anisotropic conductive film is prepared as follows. That is, first, the conductive particles are held in the opening of the transfer mold having the opening, and the adhesive film on which the transfer adhesive layer is formed is pressed from above, and the conductive particles are primarily transferred to the adhesive layer. Next, the polymer particles that constitute the anisotropic conductive film are pressed against the conductive particles attached to the adhesive layer, and the conductive particles are secondarily transferred to the surface of the polymer film by heating and pressing. Next, an anisotropic conductive film is formed by forming an adhesive layer on the conductive particle side surface of the polymer film to which the conductive particles are secondarily transferred so as to cover the conductive particles.
- An object of the present invention is to solve the above-described problems of the prior art, and in an anisotropic conductive film in which conductive particles are arranged in a single layer, as created using a transfer mold having an opening, To achieve good connection reliability, good insulation, and good particle trapping efficiency.
- the conductive resin is temporarily transferred to the adhesive film without temporarily transferring the conductive particles to the adhesive film.
- the present invention has found that the above-mentioned object is achieved by sandwiching both surfaces of an insulating resin layer in which conductive particles are arranged in a single layer with an insulating resin layer functioning as an adhesive layer. Completed.
- the present invention is an anisotropic conductive film having a three-layer structure in which the first connection layer is sandwiched between the second connection layer and the third connection layer mainly made of an insulating resin,
- the first connection layer has a structure in which conductive particles are arranged in a single layer in the planar direction on the second connection layer side of the insulating resin layer, and the insulating resin layer thickness in the central region between adjacent conductive particles is Provided is an anisotropic conductive film that is thinner than the thickness of an insulating resin layer in the vicinity of conductive particles.
- the present invention also provides a method for producing the above-mentioned anisotropic conductive film, which comprises the following steps (A) to (D).
- ⁇ Process (A)> A step of disposing conductive particles in the opening of the transfer mold in which the opening is formed and causing the insulating resin layer formed on the release film to face the surface of the transfer mold in which the opening is formed.
- the present invention also provides another method for producing the above anisotropic conductive film, which comprises the following steps (a) to (c).
- ⁇ Process (a)> A step of disposing conductive particles in the opening of the transfer mold in which the opening is formed, and making the insulating resin layer on which the third connection layer is bonded in advance face the surface of the transfer mold in which the opening is formed.
- Step (c)> Forming a second connection layer mainly made of an insulating resin on the conductive particle side surface of the first connection layer;
- the present invention also provides a connection structure in which the first electronic component is anisotropically conductively connected to the second electronic component using the anisotropic conductive film described above.
- the present invention also provides a connection method for anisotropically conductively connecting a first electronic component to a second electronic component using the above-described anisotropic conductive film, An anisotropic conductive film is temporarily attached to the second electronic component from the third connection layer side, and the first electronic component is mounted on the temporarily attached anisotropic conductive film from the first electronic component side.
- a connection method for thermocompression bonding is provided.
- the first connection layer is the second connection of the insulating resin layer. It has a structure in which conductive particles are arranged in a single layer in the plane direction on the layer side, and the insulating resin layer thickness at the center between adjacent conductive particles is thinner than the insulating resin layer thickness near the conductive particles It has a structure. For this reason, in the anisotropic conductive film in which the conductive particles are arranged in a single layer, it is possible to realize good connection reliability, good insulation, and good particle capturing efficiency.
- FIG. 1A is a cross-sectional view of the anisotropic conductive film of the present invention.
- FIG. 1B is a cross-sectional view of the anisotropic conductive film of the present invention.
- FIG. 1C is a cross-sectional view of the anisotropic conductive film of the present invention.
- FIG. 2A is an explanatory diagram of the production process (A) of the anisotropic conductive film of the present invention.
- FIG. 2B is an explanatory diagram of the production process (A) of the anisotropic conductive film of the present invention.
- FIG. 3A is an explanatory diagram of the production process (B) of the anisotropic conductive film of the present invention.
- FIG. 1A is a cross-sectional view of the anisotropic conductive film of the present invention.
- FIG. 1B is a cross-sectional view of the anisotropic conductive film of the present invention.
- FIG. 1C is a cross-sectional view of the ani
- FIG. 3B is an explanatory diagram of the production process (B) of the anisotropic conductive film of the present invention.
- FIG. 3C is an explanatory diagram of the production process of the anisotropic conductive film of the present invention.
- FIG. 4 is explanatory drawing of the manufacturing process (C) of the anisotropic conductive film of this invention.
- FIG. 5 is an explanatory view of the production process (D) of the anisotropic conductive film of the present invention.
- FIG. 6A is an explanatory diagram of the production process (a) of the anisotropic conductive film of the present invention.
- Drawing 6B is an explanatory view of the manufacturing process (a) of the anisotropic conductive film of the present invention.
- FIG. 7A is explanatory drawing of the manufacturing process (b) of the anisotropic conductive film of this invention.
- FIG. 7B is explanatory drawing of the manufacturing process (b) of the anisotropic conductive film of this invention.
- FIG. 7C is explanatory drawing of the manufacturing process (b) of the anisotropic conductive film of this invention.
- FIG. 8 is an explanatory view of the production process (c) of the anisotropic conductive film of the present invention.
- the anisotropic conductive film 100 of the present invention has a three-layer structure in which a first connection layer 1 is sandwiched between a second connection layer 2 and a third connection layer 3 mainly made of an insulating resin.
- the first connection layer 1 has a structure in which conductive particles 4 are arranged in a single layer in the planar direction of the insulating resin layer 10 on the second connection layer 2 side.
- the conductive particles 4 may be closely packed in the planar direction, but the conductive particles 4 are regularly arranged in the planar direction at regular intervals (for example, in a square lattice pattern). Is preferred.
- the insulating resin layer thickness t 1 in the central region between the adjacent conductive particles 4 has a structure that is thinner than the insulating resin layer thickness t 2 in the vicinity of the conductive particles 4.
- the conductive particles 4 that are not used because they do not exist between the terminals to be connected are shown in FIG.
- the insulating resin layer between the conductive particles 4 is melted by heating and pressurization at the time of anisotropic conductive connection so that the conductive particles 4 can be coated to form the covering layer 1d. Occurrence can be suppressed.
- the central region between the adjacent conductive particles 4 is a region within ⁇ L / 4 with the intermediate point P of the distance L between the adjacent conductive particles as the center, as shown in FIG. 1A.
- the vicinity of the conductive particles means a position in the vicinity of a line segment in contact with the conductive particles 4 in the layer thickness direction of the first connection layer 1.
- the insulating resin layer thickness t1 and the insulating resin layer thickness t2 further have the following relationship. This is because when t1 is too thin with respect to t2, the conductive particles 4 tend to flow and the particle trapping efficiency tends to decrease. When the thickness is too close to t2, it is difficult to obtain the effect of the present invention. Because there is a tendency to become.
- the absolute thickness of the insulating resin layer thickness t1 is preferably 0.5 ⁇ m or more because there is a concern that it is difficult to form the first connection layer 1 if it is too thin.
- the absolute thickness of the insulating resin layer thickness t2 if the insulating resin layer 10 is too thick, it is difficult to remove the insulating resin layer 10 from the connection region at the time of anisotropic conductive connection. Preferably it is 6 micrometers or less.
- the space between the conductive particles 4 The insulating resin layer thickness may be substantially zero.
- substantially 0 means a state in which insulating resin layers containing conductive particles exist independently. In such a case, the above formula cannot be applied. Therefore, in order to achieve good connection reliability, good insulation, and good particle trapping efficiency, insulation with a perpendicular passing through the center of the conductive particle 4 is not possible. It can be preferably performed by controlling the shortest distances L 1 , L 2 , L 3 , L 4 .
- the resin amount of the first connection layer 1 is relatively increased, the productivity is improved, and the flow of the conductive particles 4 can be suppressed.
- the resin amount of the first connection layer 1 is relatively reduced, and the interparticle distance can be easily controlled. In other words, the accuracy of alignment of the conductive particles can be improved.
- the preferred distances L 1 , L 2 , L 3 , L 4 ... are preferably greater than 0.5 times and less than 1.5 times, more preferably 0.6 to 1.2 times the particle diameter of the conductive particles 4. Range.
- the conductive particles 4 may be buried in the first connection layer 1.
- the degree of burying whether buried shallowly or deeply varies depending on the viscosity of the material at the time of forming the first connection layer 1 and the shape and size of the transfer-type opening in which the conductive particles are arranged. It can be controlled by the relationship between the base diameter of the opening and the opening diameter.
- the base diameter is preferably 1.1 times or more and less than 2 times the conductive particle diameter
- the opening diameter is preferably 1.3 times or more and less than 3 times the conductive particle diameter.
- the electroconductive particle 4 ' may exist in the 2nd connection layer 2.
- a known insulating resin layer can be appropriately employed.
- a heat or photo radical polymerization type resin layer containing an acrylate compound and a heat or photo radical polymerization initiator or a layer obtained by heat or photo radical polymerization thereof, or an epoxy compound and a heat or photo cation or anion polymerization initiator
- the first connection layer 1 can be formed by irradiating the photoradical polymerization type resin layer with ultraviolet rays and photoradical polymerization. In this case, when the photoradical polymerization resin layer is irradiated with ultraviolet rays from the conductive particle side before the second connection layer 2 is formed, photoradical polymerization is performed in the first connection layer 1 as shown in FIG. 1A.
- the curing rate of the region 1X located between the particles 4 and the surface 3a of the third connection layer 3 can be made lower than the curing rate of the region 1Y located between the adjacent conductive particles. Therefore, the minimum melt viscosity of the region 1X having a low curing rate in the first connection layer can be made smaller than the minimum melt viscosity of the region 1Y having a high cure rate in the first connection layer.
- the displacement of the conductive particles 4 can be prevented, the particle capturing efficiency can be improved, the pushability of the conductive particles 4 can be improved, the conduction resistance value can be lowered, and good conduction reliability can be realized.
- the curing rate is a numerical value defined as a reduction ratio of functional groups (for example, vinyl groups) contributing to polymerization. Specifically, if the vinyl group content after curing is 20% before curing, the curing rate is 80%.
- the abundance of vinyl groups can be measured by characteristic absorption analysis of vinyl groups in the infrared absorption spectrum.
- the curing rate of the region 1X is preferably 40 to 80%, while the curing rate of the region 1Y is preferably 70 to 100%.
- the minimum melt viscosity of the 1st connection layer 1 measured with the rheometer is higher than each minimum melt viscosity of the 2nd connection layer 2 and the 3rd connection layer 3.
- the particle trapping efficiency tends to decrease and the probability of occurrence of a short circuit tends to increase, and if it is too high, the conduction reliability tends to decrease, so it is preferably 1 to 1000, more preferably 4 to 400.
- the preferred minimum melt viscosity of each of the formers is that if the value is too low, the particle trapping efficiency tends to decrease, and if the value is too high, the conduction resistance value tends to increase. Therefore, the preferred minimum melt viscosity is preferably 100 to 100,000 mPa ⁇ s. 500 to 50000 mPa ⁇ s is preferable. Regarding the latter, if it is too low, the resin tends to protrude when it is reeled, and if it is too high, the conduction resistance value tends to increase. Therefore, it is preferably 0.1 to 10,000 mPa ⁇ s, more preferably 1 to 1000 mPa ⁇ s.
- acrylate compound used for the insulating resin layer 10 constituting the first connection layer 1 a conventionally known radical polymerizable acrylate can be used.
- monofunctional (meth) acrylate here, (meth) acrylate includes acrylate and methacrylate
- bifunctional or more polyfunctional (meth) acrylate can be used.
- Monofunctional (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) ) Acrylate, t-butyl (meth) acrylate, 2-methylbutyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-heptyl (meth) acrylate, 2-methylhexyl (meth) Acrylate, 2-ethylhexyl (meth) acrylate, 2-butylhexyl (meth) acrylate, isooctyl (meth) acrylate, isopentyl (meth) acrylate, isononyl (meth) acrylate, isode
- Bifunctional (meth) acrylates include bisphenol F-EO modified di (meth) acrylate, bisphenol A-EO modified di (meth) acrylate, polypropylene glycol di (meth) acrylate, polyethylene glycol (meth) acrylate, and tricyclodecanedi. Examples include methylol di (meth) acrylate and dicyclopentadiene (meth) acrylate.
- Examples of the trifunctional (meth) acrylate include trimethylolpropane tri (meth) acrylate, trimethylolpropane PO-modified (meth) acrylate, and isocyanuric acid EO-modified tri (meth) acrylate.
- tetrafunctional or higher functional (meth) acrylates examples include dipentaerythritol penta (meth) acrylate, pentaerythritol hexa (meth) acrylate, pentaerythritol tetra (meth) acrylate, and ditrimethylolpropane tetraacrylate.
- polyfunctional urethane (meth) acrylates can also be used. Specific examples include M1100, M1200, M1210, M1600 (above, Toagosei Co., Ltd.), AH-600, AT-600 (above, Kyoeisha Chemical Co., Ltd.) and the like.
- the content of the acrylate compound in the insulating resin layer 10 constituting the first connection layer 1 is too small, it tends to be difficult to make the minimum melt viscosity difference with the second connection layer 2, and if too large, the curing shrinkage is large. Therefore, the workability tends to be reduced, so the content is preferably 2 to 70% by mass, more preferably 10 to 50% by mass.
- a radical photopolymerization initiator it can be used by appropriately selecting from known radical photopolymerization initiators.
- an acetophenone photopolymerization initiator, a benzyl ketal photopolymerization initiator, a phosphorus photopolymerization initiator, and the like can be given.
- 2-hydroxy-2-cyclohexylacetophenone IRGACURE 184, BASF Japan Ltd.
- ⁇ -hydroxy- ⁇ , ⁇ ′-dimethylacetophenone Darocur
- DAROCUR 1173, BASF Japan Ltd., 2,2-dimethoxy-2-phenylacetophenone (IRGACURE 651, BASF Japan Ltd.), 4- (2-hydroxyethoxy) phenyl (2-hydroxy-) 2-propyl) ketone (DAROCUR 2959, BASF Japan Ltd.), 2-hydroxy-1- ⁇ 4- [2-hydroxy-2-methyl-propionyl] -benzyl ⁇ phenyl ⁇ -2-methyl-propane -1-On (irugaki A (IRGACURE) 127, BASF Japan Ltd.) and the like.
- benzyl ketal photoinitiators examples include benzophenone, fluorenone, dibenzosuberone, 4-aminobenzophenone, 4,4'-diaminobenzophenone, 4-hydroxybenzophenone, 4-chlorobenzophenone, 4,4'-dichlorobenzophenone, etc. It is done. Further, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (IRGACURE 369, BASF Japan Ltd.) can also be used.
- bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide (IRGACURE 819, BASF Japan Ltd.), (2,4,6-trimethylbenzoyl-diphenylphossine) Examples include fin oxide (DAROCURE TPO, BASF Japan Ltd.).
- the amount of the radical photopolymerization initiator used is too small relative to 100 parts by mass of the acrylate compound, the photoradical polymerization tends not to proceed sufficiently.
- the amount is preferably 0.1 to 25 parts by mass, more preferably 0.5 to 15 parts by mass.
- thermal radical polymerization initiator examples include organic peroxides and azo compounds, but organic peroxides that do not generate nitrogen that causes bubbles can be preferably used.
- organic peroxides include methyl ethyl ketone peroxide, cyclohexanone peroxide, methylcyclohexanone peroxide, acetylacetone peroxide, 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (Tert-butylperoxy) cyclohexane, 1,1-bis (tert-hexylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (tert-hexylperoxy) cyclohexane, 1,1-bis ( tert-butylperoxy) cyclododecane, isobutyl peroxide, lauroyl peroxide, oxalic acid peroxide, 3,5,5-trimethylhexanoyl peroxide, benzoyl peroxide, octanoyl peroxide, stearoyl peroxide Id, di
- azo compound examples include 1,1-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2-methyl-butyronitrile), 2,2′-azobisbutyronitrile, 2,2′- Azobis (2,4-dimethyl-valeronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), 2,2'-azobis (2-amidino-propane) hydrochloride, 2, 2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] hydrochloride, 2,2'-azobis [2- (2-imidazolin-2-yl) propane] hydrochloride, 2, 2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane], 2,2'-azobis [2-methyl-N- (1,1-bis (2-hydroxymethyl) -2 -Hydroxyethyl) Propionamide], 2,2'-azobis [2-methyl-N- (2-(
- the amount of the thermal radical polymerization initiator used is preferably 2 to 60 parts by weight, more preferably 5 to 40 parts per 100 parts by weight of the acrylate compound. Part by mass.
- the insulating resin layer 10 constituting the first connection layer 1 is made of a heat or photocation or anion polymerization type resin layer containing an epoxy compound and heat or a photocation or anion polymerization initiator, or heat or light of them. You may comprise from what carried out radical polymerization.
- the epoxy compound include compounds or resins having two or more epoxy groups in the molecule. These may be liquid or solid. Specifically, bisphenol A, bisphenol F, bisphenol S, hexahydrobisphenol A, tetramethylbisphenol A, diallyl bisphenol A, hydroquinone, catechol, resorcin, cresol, tetrabromobisphenol A, trihydroxybiphenyl, benzophenone, bisresorcinol, Glycidyl ether obtained by reacting polychlorophenol and epichlorohydrin such as bisphenol hexafluoroacetone, tetramethylbisphenol A, tetramethylbisphenol F, tris (hydroxyphenyl) methane, bixylenol, phenol novolak, cresol novolak, or glycerin, Neopentyl glycol, ethylene glycol, propylene glycol, tylene glycol Polyglycidyl ethers obtained by reacting alipha
- epoxy resins such as epoxidized polyolefin.
- alicyclic epoxy compounds such as 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexenecarboxylate can also be used.
- thermal cationic polymerization initiator those known as thermal cationic polymerization initiators for epoxy compounds can be employed.
- heat can generate an acid capable of cationically polymerizing a cationic polymerization type compound.
- Iodonium salts, sulfonium salts, phosphonium salts, ferrocenes, and the like can be used, and aromatic sulfonium salts exhibiting good potential with respect to temperature can be preferably used.
- thermal cationic polymerization initiator examples include diphenyliodonium hexafluoroantimonate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroborate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium hexafluorophosphate, triphenyls.
- Rufonium hexafluoroborate is exemplified. Specifically, ADEKA Corporation SP-150, SP-170, CP-66, CP-77; Nippon Soda Co., Ltd. CI-2855, CI-2939; Sanshin Chemical Industry Co., Ltd. Examples thereof include CYRACURE-UVI-6990 and UVI-6974 manufactured by Union Carbide.
- the thermal cationic polymerization initiator If the amount of the thermal cationic polymerization initiator is too small, the thermal cationic polymerization tends not to proceed sufficiently, and if it is too large, there is a concern that it may cause a decrease in rigidity. Is 0.1 to 25 parts by mass, more preferably 0.5 to 15 parts by mass.
- thermal anionic polymerization initiator those known as the thermal anionic polymerization initiator of the epoxy compound can be employed.
- a base capable of anionic polymerization of the anionic polymerizable compound is generated by heat, and is publicly known.
- Aliphatic amine compounds, aromatic amine compounds, secondary or tertiary amine compounds, imidazole compounds, polymercaptan compounds, boron trifluoride-amine complexes, dicyandiamide, organic acid hydrazides, etc. can be used.
- An encapsulated imidazole compound showing good potential with respect to temperature can be preferably used. Specific examples include NovaCure HX3941HP manufactured by Asahi Kasei E-Materials Corporation.
- the amount of the thermal anionic polymerization initiator is preferably 2 to 60 masses per 100 mass parts of the epoxy compound. Part, more preferably 5 to 40 parts by weight.
- Photocationic polymerization initiator and photoanionic polymerization initiator A well-known thing can be used suitably as a photocationic polymerization initiator or photoanion polymerization initiator for epoxy compounds.
- the electroconductive particle 4 which comprises the 1st connection layer 1 it can select and use suitably from what is used for the conventionally well-known anisotropic conductive film.
- metal particles such as nickel, cobalt, silver, copper, gold, and palladium, metal-coated resin particles, and the like can be given. Two or more kinds can be used in combination.
- the thickness is 10 ⁇ m, more preferably 2 to 6 ⁇ m.
- the average particle diameter can be measured by a general particle size distribution measuring apparatus.
- the amount of such conductive particles 4 in the first connection layer 1 is too small, the particle trapping efficiency is lowered and anisotropic conductive connection becomes difficult. Is 50 to 40,000, more preferably 200 to 20000 per square mm.
- a film-forming resin such as a phenoxy resin, an epoxy resin, an unsaturated polyester resin, a saturated polyester resin, a urethane resin, a butadiene resin, a polyimide resin, a polyamide resin, or a polyolefin resin is used in combination as necessary. be able to.
- the insulating resin layer 10 constituting the first connection layer 1 is obtained by photoradical polymerization of a photoradical polymerization resin layer composed of an acrylate compound and a photoradical polymerization initiator, It is preferable to contain an epoxy compound and a thermal cationic polymerization initiator. In this case, as will be described later, it is preferable that the second connection layer 2 and the third connection layer 3 are also a thermal cation polymerization type resin layer containing an epoxy compound and a thermal cation polymerization initiator. Thereby, delamination strength can be improved.
- the conductive particles 4 bite into the second connection layer 2 (in other words, the conductive particles 4 are exposed on the surface of the first connection layer 1.
- the average particle diameter of the conductive particles 4 is preferably 10 to 90%, more preferably 20%. ⁇ 80%.
- the first connection layer 1 is formed by disposing the conductive particles 4 in the opening of the mold in which the opening is formed, and the first connection layer 1 formed on the release film on the surface of the mold in which the opening 21 is formed.
- the insulating resin layer 10 to be opposed to each other and pressurizing while heating as necessary to such an extent that the insulating resin does not enter the corners of the bottom of the opening.
- Each of the second connection layer 2 and the third connection layer 3 is mainly formed from an insulating resin.
- the insulating resin it can be used by appropriately selecting from known insulating resins. It can be formed from the same material as the insulating resin layer 10 of the first connection layer 1.
- the second connection layer 2 is located on the conductive particle 4 side of the first connection layer 1 and is usually a layer disposed on the terminal side that requires alignment with high positional accuracy, such as bumps of an IC chip.
- the 3rd connection layer 3 is normally distribute
- the layer thickness of the second connection layer 2 is too thin, there is a concern that poor conduction due to insufficient resin filling may occur, and if it is too thick, the resin may protrude during crimping, which may cause contamination of the crimping device. Is 5 to 20 ⁇ m, more preferably 8 to 15 ⁇ m. On the other hand, if the layer thickness of the third connection layer 3 is too thin, there is a concern that a sticking failure may occur when temporarily sticking to the second electronic component, and if it is too thick, the conduction resistance value tends to increase.
- the thickness is 0.5 to 6 ⁇ m, more preferably 1 to 5 ⁇ m.
- the conductive particles 4 are disposed in the opening 21 of the transfer mold 20 in which the opening 21 is formed, and a release film is formed on the surface of the transfer mold 20 in which the opening 21 is formed as shown in FIG. 2B.
- the insulating resin layer 10 formed on 22 is made to oppose.
- an opening is formed in a known opening forming method such as a photolithographic method in an inorganic material such as silicon, various ceramics, glass, stainless steel, or an inorganic material, or an organic material such as various resins. It is what.
- a transfer mold 20 can take a plate shape, a roll shape, or the like.
- the opening 21 of the transfer mold 20 accommodates the conductive particles 4 therein.
- Examples of the shape of the opening 21 include a cylindrical shape, a polygonal column shape such as a quadrangular pyramid, and a pyramid shape such as a quadrangular pyramid.
- the arrangement of the openings 21 is preferably a regular arrangement such as a lattice shape or a staggered shape.
- the diameter and depth of the opening 21 of the transfer mold 20 can be measured with a laser microscope.
- the method for accommodating the conductive particles 4 in the opening 21 of the transfer mold 20 is not particularly limited, and a known method can be adopted. For example, after spraying or applying a dried conductive particle powder or a dispersion in which this is dispersed in a solvent on the opening forming surface of the transfer mold 20, the surface of the opening forming surface is wiped using a brush or a blade. Good.
- the ratio of the average particle diameter of the conductive particles 4 to the depth of the opening 21 is preferably 0.4 to from the balance between transferability improvement and conductive particle retention. 3.0, more preferably 0.5 to 1.5.
- the ratio of the diameter of the opening 21 to the average particle diameter of the conductive particles 4 is a balance of the ease of accommodating the conductive particles, the ease of pushing in the insulating resin, and the like. Therefore, it is preferably 1.1 to 2.0, more preferably 1.3 to 1.8.
- the base diameter is 1.1 to 2 times the conductive particle diameter, and the opening diameter is 1.3 to 3 times the conductive particle diameter. It is preferable that
- the second connection layer 2 mainly made of an insulating resin is formed on the surface of the first connection layer 1 on the conductive particle 4 side.
- the shape thereof is a wave shape or an uneven shape.
- the conductive particles 4 can be fixed to the first connection layer 1, and the curing rate of the first connection layer 1 below the conductive particles 4 can be made relatively lower than its surroundings, and the anisotropy The pushability of the conductive particles at the time of conductive connection can be improved.
- the conductive particles 4 are disposed in the opening 21 of the transfer mold 20 in which the opening 21 is formed.
- the surface of the transfer mold 20 in which the opening 21 is formed is preliminarily placed on the surface.
- the insulating resin layer 10 to which the three connection layers 3 are bonded is opposed.
- Step (b)> pressure is applied to the insulating resin layer 10 from the third connection layer 3 side, and the insulating resin is pushed into the openings 21, so that the conductive particles 4 are formed on the surface of the insulating resin layer 10.
- the conductive particles 4 are arranged in a single layer in the planar direction of the insulating resin layer 10, and the insulating resin layer thickness in the central region between the adjacent conductive particles 4 is as follows.
- the first connection layer 1 that is thinner than the thickness of the insulating resin layer in the vicinity of the conductive particles is formed.
- the insulating resin layer thickness may be practically 0 between the adjacent conductive particles 4 (see FIG. 1C).
- Step (c)> the second connection layer 2 mainly made of an insulating resin is formed on the surface of the first connection layer 1 on the conductive particle 4 side. Thereby, the anisotropic conductive film 100 shown in FIG. 8 is obtained.
- the conductive particles 4 can be fixed to the first connection layer 1, and the curing rate of the first connection layer 1 below the conductive particles 4 can be made relatively lower than its surroundings, and the anisotropy The pushability of the conductive particles at the time of conductive connection can be improved.
- the conductive particles 4 are mainly included in the first connection layer 1.
- the region of the first connection layer 1 that encloses the conductive particle has a convex shape on the second connection layer 2 side.
- the width on the third connection layer side is wider than the width.
- the shortest distance p in the horizontal direction between the end in the thickness direction of the conductive particles 4 (the lower end of the particles) and the second connection layer 2 on the wide side contributes to the stability of the conductive particles at the time of connection. That is, p has a role corresponding to the pedestal of the fixed portion.
- p represents the length corresponding to the base of the mountain shape, that is, the length until the effect can be expected.
- the shortest distance p in the horizontal direction from the end portion of the conductive particles in the thickness direction to the second connection layer 2 is preferably 0.5 to 1.5 times the diameter of the conductive particles, more preferably 0.55 to 1. It will be 25 times.
- the anisotropic conductive film thus obtained connects the first electronic component such as an IC chip or IC module and the second electronic component such as a flexible substrate or a glass substrate by heat or light. In particular, it can be preferably applied.
- the connection structure thus obtained is also part of the present invention.
- an anisotropic conductive film is temporarily attached to the second electronic component such as a wiring board from the third connection layer side, and the first electronic such as an IC chip is attached to the temporarily attached anisotropic conductive film. It is preferable from the viewpoint of improving connection reliability that components are mounted and thermocompression bonded from the first electronic component side. Moreover, it can also connect using photocuring.
- Examples 1 to 10 According to the composition described in Table 1 or Table 2, a mixed solution of acrylate, photo radical polymerization initiator and the like was prepared with ethyl acetate or toluene so that the solid content was 50% by mass. This mixed solution is applied to a polyethylene terephthalate film (PET film) having a thickness of 50 ⁇ m so as to have a dry thickness of 5 ⁇ m, and is dried in an oven at 80 ° C. for 5 minutes. A polymerization type insulating resin layer was formed.
- PET film polyethylene terephthalate film
- a transfer mold made of stainless steel in which cylindrical openings having a diameter of 5.5 ⁇ m and a depth of 4.5 ⁇ m are provided at a pitch of 9 ⁇ m in length and width is prepared, and conductive particles (Ni / Ni) having an average particle diameter of 4 ⁇ m are prepared in each opening.
- Au plated resin particles, AUL704, Sekisui Chemical Co., Ltd. were accommodated one by one.
- the insulating resin layer for the first connection layer is opposed to the opening forming surface of the transfer mold, and the conductive particles are applied to the insulating resin layer by pressing from the release film side under the condition of 0.5 MPa at 60 ° C. I pushed it in.
- an insulating resin layer in which the insulating resin layer thickness in the central region between adjacent conductive particles is thinner than the insulating resin layer thickness in the vicinity of the conductive particles was formed.
- a first connection layer having conductive particles fixed on the surface is formed. Formed.
- thermosetting resin and a latent curing agent A liquid mixture of a thermosetting resin and a latent curing agent was prepared with ethyl acetate or toluene so that the solid content was 50% by mass. This mixed solution was applied to a PET film having a thickness of 50 ⁇ m so as to have a dry thickness of 12 ⁇ m, and dried in an oven at 80 ° C. for 5 minutes to form a second connection layer. A third connection layer having a dry thickness of 3 ⁇ m was formed by the same operation.
- the second connection layer was laminated to the first connection layer thus obtained under the conditions of 60 ° C. and 0.5 MPa so that the conductive particles were inside, and then the third connection layer was formed on the opposite surface.
- the anisotropic conductive film was obtained by laminating similarly.
- anisotropic conductive films were prepared so that the thickness of the first connection layer between the conductive particles was substantially zero. Specifically, the insulating resin layer for the first connection layer is made to face, and after pressurizing from the release film side under the condition of 0.5 MPa at 60 ° C., it is re-pressurized under the condition of 1.0 MPa at 60 ° C. Except for this, an anisotropic conductive film was prepared under the same conditions as in Example 1.
- Comparative Example 1 According to the formulation described in Table 1, a photo-radical polymerization type insulating resin layer, which is a precursor layer of the first connection layer, was formed in the same manner as in Example 1.
- Au plated resin particles, AUL704, Sekisui Chemical Co., Ltd. were accommodated one by one.
- the insulating resin layer for the first connection layer is opposed to the opening forming surface of the transfer mold, and the conductive particles are insulated by pressing from the release film side at a relatively weak condition of 0.1 MPa at 40 ° C. Was transferred to the surface of the conductive resin layer. The film on which the conductive particles were transferred was taken out, and the conductive particles were completely pushed into the insulating resin layer so that the surface of the resin layer was flat.
- a flat first connection layer was formed by irradiating ultraviolet light having a wavelength of 365 nm and an integrated light amount of 4000 mL / cm 2 to the photo radical polymerization type insulating resin layer in which the conductive particles were embedded.
- An anisotropic conductive film was obtained by laminating a 12 ⁇ m-thick second connection layer and a 3 ⁇ m-thick third connection layer prepared in the same manner as in Example 1 on the first connection layer.
- Comparative Example 2 A conductive particle-containing resin having a thickness of 6 ⁇ m is obtained from a mixture in which the same conductive particles as used in Example 1 in the resin composition for the first connection layer shown in Table 1 are uniformly dispersed so as to have 20000 per square mm. A film was created. An anisotropic conductive film having a two-layer structure was prepared by sticking a 12 ⁇ m-thick second connection layer prepared in the same manner as in Example 1 to this film under the condition of 0.5 MPa at 60 ° C.
- an IC chip (bump size 30 ⁇ 85 ⁇ m: bump height 15 ⁇ m, bump pitch 50 ⁇ m) of 0.5 ⁇ 1.8 ⁇ 20.0 mm is 0.5
- the sample was mounted on a glass wiring board (1737F) manufactured by Corning having a size of ⁇ 50 ⁇ 30 mm under the conditions of 180 ° C., 80 MPa, and 5 seconds to obtain a connection structure sample body.
- a glass wiring board (1737F) manufactured by Corning having a size of ⁇ 50 ⁇ 30 mm under the conditions of 180 ° C., 80 MPa, and 5 seconds to obtain a connection structure sample body.
- an insulating resin layer was present around the conductive particles as shown in FIG. 1A.
- connection structure sample was tested and evaluated for “minimum melt viscosity”, “particle capture efficiency”, “conduction reliability”, and “insulation” as described below.
- the obtained results are shown in Table 1 or Table 2.
- Minimum melt viscosity The minimum melt viscosity of each of the first connection layer and the second connection layer constituting the connection structure sample body was measured using a rotary rheometer (TA Instruments) at a heating rate of 10 ° C./min; Measurement was performed under the condition of a plate diameter of 8 mm.
- Particle capture efficiency Particles that are actually trapped on the bumps of the connection structure sample body after heating / pressurization (after actual mounting) against the “theoretical particle amount existing on the bumps of the connection structure sample body before heating / pressurization”
- the ratio of “amount” was determined according to the following formula. Practically, it is desirable that it is 50% or more.
- connection structure sample was left in a high-temperature and high-humidity environment at 85 ° C. and 85% RH, and the conduction resistance value at the initial stage and after the elapse of 500 hours was measured. Practically, it is desirable that the resistance value is 10 ⁇ or less even after 500 hours.
- the anisotropic conductive films of Examples 1 to 6 showed practically preferable results for the evaluation items of particle trapping efficiency, conduction reliability, and insulation.
- the layers react with each other, and the pushability of the conductive particles slightly decreases. It can be seen that the conduction resistance value tends to increase.
- the first connection layer is a cationic polymerization system
- the heat resistance is improved as compared with the radical polymerization system, so that it is understood that the pushability of the conductive particles also slightly decreases and the conduction resistance value tends to increase. .
- the anisotropic conductive film of Comparative Example 1 in the first connection layer, the insulating resin layer thickness in the central region between adjacent conductive particles is thinner than the insulating resin layer thickness in the vicinity of the conductive particles. As a result, the conduction reliability has greatly deteriorated.
- the anisotropic conductive films of Examples 7 to 10 have an independence of the conductive particles because the thickness of the central portion between the conductive particles is zero, and the particle trapping efficiency, conduction reliability, For each of the evaluation items of insulating properties, practically preferable results were shown.
- the first connection layer is the second connection of the insulating resin layer. It has a structure in which conductive particles are arranged in a single layer in the plane direction on the layer side, and the insulating resin layer thickness at the center between adjacent conductive particles is thinner than the insulating resin layer thickness near the conductive particles It has a structure. For this reason, in the anisotropic conductive film in which the conductive particles are arranged in a single layer, it is possible to realize good connection reliability, good insulation, and good particle capturing efficiency. Therefore, it is useful for anisotropic conductive connection of an electronic component such as an IC chip to a wiring board.
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Abstract
Description
第1接続層が、絶縁性樹脂層の第2接続層側の平面方向に導電粒子が単層で配列された構造を有し、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている異方性導電フィルムを提供する。
開口が形成された転写型の開口内に導電粒子を配置し、開口が形成された転写型の表面に、剥離フィルム上に形成された絶縁性樹脂層を対向させる工程。
剥離フィルム側から絶縁性樹脂層に対して圧力をかけ、開口内に絶縁性樹脂を押し込んで絶縁性樹脂層の表面に導電粒子を転着させ、それにより、絶縁性樹脂層の平面方向に導電粒子が単層で配列された構造であって、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層を形成する工程。
第1接続層の導電粒子側表面に、主として絶縁性樹脂からなる第2接続層を形成する工程。
第2接続層と反対側の第1接続層の表面に、主として絶縁性樹脂からなる第3接続層を形成する工程。
開口が形成された転写型の開口内に導電粒子を配置し、開口が形成された転写型の表面に、予め第3接続層が貼り合わされた絶縁性樹脂層を対向させる工程。
剥離フィルム側から絶縁性樹脂層に対して圧力をかけ、開口内に絶縁性樹脂を押し込んで絶縁性樹脂層の表面に導電粒子を転着させ、それにより、絶縁性樹脂層の平面方向に導電粒子が単層で配列された構造であって、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層を形成する工程。
第1接続層の導電粒子側表面に、主として絶縁性樹脂からなる第2接続層を形成する工程。
第2電子部品に対し、異方性導電フィルムをその第3接続層側から仮貼りし、仮貼りされた異方性導電フィルムに対し、第1電子部品を搭載し、第1電子部品側から熱圧着する接続方法を提供する。
図1Aに示すように、本発明の異方性導電フィルム100は、第1接続層1が、主として絶縁性樹脂からなる第2接続層2と第3接続層3とに挟持された3層構造を有する。この第1接続層1は、絶縁性樹脂層10の第2接続層2側の平面方向に導電粒子4が単層で配列されている構造を有する。この場合、導電粒子4は、平面方向に最密充填されていてもよいが、導電粒子4が平面方向に一定の間隔をあけて規則的に(例えば、正方格子状に)配列されていることが好ましい。また、隣接する導電粒子4間の中央領域の絶縁性樹脂層厚t1が、導電粒子4の近傍の絶縁性樹脂層厚t2よりも薄くなっている構造を有する。絶縁性樹脂層厚t1が絶縁性樹脂層厚t2よりも薄くなっていると、異方性導電接続の際、接続すべき端子間に存在せずに利用されなかった導電粒子4は、図1Bに示すように、異方性導電接続の際の加熱加圧により導電粒子4間の絶縁性樹脂層が溶断して導電粒子4を被覆して被覆層1dを形成することができるため、ショートの発生を抑制することができる。
このような第1接続層1を構成する絶縁性樹脂層10としては、公知の絶縁性樹脂層を適宜採用することができる。例えば、アクリレート化合物と熱又は光ラジカル重合開始剤とを含む熱又は光ラジカル重合型樹脂層又はそれを熱又は光ラジカル重合させたもの、またはエポキシ化合物と熱又は光カチオン若しくはアニオン重合開始剤とを含む熱又は光カチオン若しくはアニオン重合型樹脂層又はそれを熱又は光カチオン重合若しくはアニオン重合させたものを採用することができる。
第1接続層1を構成する絶縁性樹脂層10に使用するアクリレート化合物としては、従来公知のラジカル重合性アクリレートを使用することができる。例えば、単官能(メタ)アクリレート(ここで、(メタ)アクリレートにはアクリレートとメタクリレートとが包含される)、二官能以上の多官能(メタ)アクリレートを使用することができる。本発明においては、接着剤を熱硬化性とするために、アクリル系モノマーの少なくとも一部に多官能(メタ)アクリレートを使用することが好ましい。
光ラジカル重合開始剤としては、公知の光ラジカル重合開始剤の中から適宜選択して使用することができる。たとえは、アセトフェノン系光重合開始剤、ベンジルケタール系光重合開始剤、リン系光重合開始剤等が挙げられる。具体的には、アセトフェノン系光重合開始剤として、2-ヒドロキシ-2-シクロへキシルアセトフェノン(イルガキュア(IRGACURE)184、BASFジャパン(株))、α-ヒドロキシ-α,α′-ジメチルアセトフェノン(ダロキュア(DAROCUR)1173、BASFジャパン(株))、2,2-ジメトキシ-2-フェニルアセトフェノン(イルガキュア(IRGACURE)651、BASFジャパン(株))、4-(2-ヒドロキシエトキシ)フェニル(2-ヒドロキシ-2-プロピル)ケトン(ダロキュア(DAROCUR)2959、BASFジャパン(株))、2-ヒドロキシ-1-{4-[2-ヒドロキシ-2-メチル-プロピオニル]-ベンジル}フェニル}-2-メチル-プロパン-1-オン(イルガキュア(IRGACURE)127、BASFジャパン(株))等が挙げられる。ベンジルケタール系光重合開始剤として、ベンゾフェノン、フルオレノン、ジベンゾスベロン、4-アミノベンゾフェノン、4,4′-ジアミノベンゾフェノン、4-ヒドロキシベンゾフェノン、4-クロロベンゾフェノン、4,4′-ジクロロベンゾフェノン等が挙げられる。また、2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタノン-1(イルガキュア(IRGACURE)369、BASFジャパン(株))も使用することができる。リン系光重合開始剤として、ビス(2,4,6-トリメチルベンゾイル)-フェニルフォスフィンオキサイド(イルガキュア(IRGACURE)819、BASFジャパン(株))、(2,4,6-トリメチルベンゾイル-ジフェニルフォスフィンオキサイド(ダロキュア(DAROCURE)TPO、BASFジャパン(株))等が挙げられる。
また、熱ラジカル重合開始剤としては、例えば、有機過酸化物やアゾ系化合物等が挙げられるが、気泡の原因となる窒素を発生しない有機過酸化物を好ましく使用することができる。
また、第1接続層1を構成する絶縁性樹脂層10を、エポキシ化合物と熱又は光カチオン若しくはアニオン重合開始剤とを含有する熱又は光カチオン若しくはアニオン重合型樹脂層、又はそれらを熱又は光ラジカル重合させたものから構成してもよい。
熱カチオン重合開始剤としては、エポキシ化合物の熱カチオン重合開始剤として公知のものを採用することができ、例えば、熱により、カチオン重合型化合物をカチオン重合させ得る酸を発生するものであり、公知のヨードニウム塩、スルホニウム塩、ホスホニウム塩、フェロセン類等を用いることができ、温度に対して良好な潜在性を示す芳香族スルホニウム塩を好ましく使用することができる。熱カチオン系重合開始剤の好ましい例としては、ジフェニルヨードニウムヘキサフルオロアンチモネート、ジフェニルヨードニウムヘキサフルオロホスフェート、ジフェニルヨードニウムヘキサフルオロボレート、トリフェニルスルフォニウムヘキサフルオロアンチモネート、トリフェニルスルフォニウムヘキサフルオロホスフェート、トリフェニルスルフォニウムヘキサフルオロボレートが挙げられる。具体的には、(株)ADEKA製SP-150、SP-170、CP-66、CP-77;日本曹達(株)製のCI-2855、CI-2639;三新化学工業(株)製のサンエイドSI-60、SI-80;ユニオンカーバイド社製のCYRACURE-UVI-6990、UVI-6974等が挙げられる。
熱アニオン重合開始剤としては、エポキシ化合物の熱アニオン重合開始剤として公知のものを採用することができ、例えば、熱により、アニオン重合性化合物をアニオン重合させ得る塩基を発生するものであり、公知の脂肪族アミン系化合物、芳香族アミン系化合物、二級又は三級アミン系化合物、イミダゾール系化合物、ポリメルカプタン系化合物、三フッ化ホウ素-アミン錯体、ジシアンジアミド、有機酸ヒドラジッド等を用いることができ、温度に対して良好な潜在性を示すカプセル化イミダゾール系化合物を好ましく使用することができる。具体的には、旭化成イーマテリアルズ(株)製ノバキュアHX3941HP等が挙げられる。
エポキシ化合物用の光カチオン重合開始剤又は光アニオン重合開始剤としては、公知のものを適宜使用することができる。
第1接続層1を構成する導電粒子4としては、従来公知の異方性導電フィルムに用いられているものの中から適宜選択して使用することができる。例えばニッケル、コバルト、銀、銅、金、パラジウムなどの金属粒子、金属被覆樹脂粒子などが挙げられる。2種以上を併用することもできる。
第1接続層1には、必要に応じて、フェノキシ樹脂、エポキシ樹脂、不飽和ポリエステル樹脂、飽和ポリエステル樹脂、ウレタン樹脂、ブタジエン樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリオレフィン樹脂などの膜形成樹脂を併用することができる。
第2接続層2及び第3接続層3は、いずれも主として絶縁性樹脂から形成されるものである。絶縁性樹脂としては、公知の絶縁性樹脂の中から、適宜選択して使用することができる。第1接続層1の絶縁性樹脂層10と同様な材質から形成することができる。
次に、本発明の異方性導電フィルムの製造方法の一例を説明する。この製造方法は、以下の工程(A)~(D)を有する。以下工程毎に説明する。
図2Aに示すように、開口21が形成された転写型20の開口21内に導電粒子4を配置し、図2Bに示すように、開口21が形成された転写型20の表面に、剥離フィルム22上に形成された絶縁性樹脂層10を対向させる。
次に、図3Aに示すように、剥離フィルム22側から絶縁性樹脂層10に対して圧力をかけ、開口21内に絶縁性樹脂を押し込んで絶縁性樹脂層10の表面に導電粒子4を埋め込むように転着させる。これにより、図3Bに示すような、絶縁性樹脂層10の平面方向に導電粒子4が単層で配列された構造であって、隣接する導電粒子4間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層1を形成する。この場合、隣接する導電粒子4間で絶縁性樹脂層厚が実施的に0となってもよい(図1C参照)。実質的に0になると、接続後の個々の導電粒子の独立性が高まり、接続時に導電粒子が互いに連結することを防止し易くなる。
次に、図4に示すように、第1接続層1の導電粒子4側表面に、主として絶縁性樹脂からなる第2接続層2を形成する。これにより、第1接続層と第2接続層の境界が起伏した状態、換言すればその形状が波型ないしは凹凸型となる。このように、フィルム内に存在する層に起伏のある形状を適用することで、接合時の主にバンプに対しての接触面積を増加させる確率を高めることができ、その結果、接着強度の向上が期待できる。
次に、剥離フィルム22を取り除いたのち、第2接続層2と反対側の第1接続層1の表面に、主として絶縁性樹脂からなる第3接続層3を形成する。これにより、図5に示す異方性導電フィルム100が得られる。
また、本発明の異方性導電フィルムの別の製造方法の例を説明する。この製造方法は、剥離フィルム22に代えて第3接続層3を使用する態様であり、以下の工程(a)~(c)を有する。以下工程毎に説明する。
図6Aに示すように、開口21が形成された転写型20の開口21内に導電粒子4を配置し、図6Bに示すように、開口21が形成された転写型20の表面に、予め第3接続層3が貼り合わされた絶縁性樹脂層10を対向させる。
次に、図7Aに示すように、第3接続層3側から絶縁性樹脂層10に対して圧力をかけ、開口21内に絶縁性樹脂を押し込んで絶縁性樹脂層10の表面に導電粒子4を転着させる。これにより、図7Bに示すような、絶縁性樹脂層10の平面方向に導電粒子4が単層で配列された構造であって、隣接する導電粒子4間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層1を形成する。この場合、隣接する導電粒子4間で絶縁性樹脂層厚が実施的に0となってもよい(図1C参照)。実質的に0になると、接続後の個々の導電粒子の独立性が高まり、接続時に導電粒子が互いに連結することを防止し易くなる。
次に、第1接続層1の導電粒子4側表面に、主として絶縁性樹脂からなる第2接続層2を形成する。これにより、図8に示す異方性導電フィルム100が得られる。
このようにして得られた異方性導電フィルムは、ICチップ、ICモジュールなどの第1電子部品と、フレキシブル基板、ガラス基板などの第2電子部品とを熱又は光により異方性導電接続する際に好ましく適用することができる。このようにして得られる接続構造体も本発明の一部である。この場合、配線基板などの第2電子部品に対し、異方性導電フィルムをその第3接続層側から仮貼りし、仮貼りされた異方性導電フィルムに対し、ICチップなどの第1電子部品を搭載し、第1電子部品側から熱圧着することが、接続信頼性を高める点から好ましい。また、光硬化を利用して接続することもできる。
表1又は表2に記載された配合に従って、アクリレート及び光ラジカル重合開始剤等を酢酸エチル又はトルエンにて固形分が50質量%となるように混合液を調製した。この混合液を、厚さ50μmのポリエチレンテレフタレートフィルム(PETフィルム)に、乾燥厚が5μmとなるように塗布し、80℃のオーブン中で5分間乾燥することにより、第1接続層となる光ラジカル重合型の絶縁性樹脂層を形成した。
表1に記載された配合に従って、実施例1と同様に第1接続層の前駆層である光ラジカル重合型の絶縁性樹脂層を形成した。
表1の第1接続層用の樹脂組成物に実施例1で使用したものと同じ導電粒子を1平方mm当たり20000個となるように均一に分散した混合物から、厚さ6μmの導電粒子含有樹脂フィルムを作成した。このフィルムに対し、実施例1と同様に作成した厚さ12μmの第2接続層を、60℃で0.5MPaという条件で貼り付けることにより2層構造の異方性導電フィルムを作成した。
得られた異方性導電フィルムにおける導電粒子間の平面方向均等配列について、平面均等配列が形成されている場合にはその適用があり(有)とし、それ以外を適用なし(無)とする。また、導電粒子近傍の絶縁性樹脂層厚について、導電粒子間の中間領域の絶縁性樹脂層厚(層厚0も含む)よりも大きい場合には、導電粒子近傍の絶縁性樹脂層厚の増大があり(有)とし、それ以外の場合をなし(無)とした。その結果を表1又は表2に示す。なお、異方性導電フィルムの構成層数も併せて示す。
接続構造サンプル体を構成する第1接続層及び第2接続層のそれぞれの最低溶融粘度を、回転式レオメータ(TA Instruments社)を用い、昇温速度10℃/分;測定圧力5g一定;使用測定プレート直径8mmという条件で測定した。
“加熱・加圧前の接続構造サンプル体のバンプ上に存在する理論粒子量”に対する“加熱・加圧後(実際の実装後)の接続構造サンプル体のバンプ上で実際に捕捉されている粒子量”の割合を以下の数式に従って求めた。実用上、50%以上であることが望ましい。
接続構造サンプル体を、85℃、85%RHの高温高湿環境下に放置し、初期と500時間経過後の導通抵抗値を測定した。実用上、500時間経過後でも抵抗値10Ω以下であることが望ましい。
7.5μmスペースの櫛歯TEGパターンのショート発生率を求めた。実用上、100ppm以下であることが望ましい。
1X 第1接続層における硬化率の低い領域
1Y 第1接続層における硬化率の高い領域
1d 被覆層
2 第2接続層
3 第3接続層
3a 第3接続層の表面
4 導電粒子
10 絶縁性樹脂層
20 転写型
21 開口
22 剥離フィルム
100 異方性導電フィルム
L 導電粒子間距離
P 導電粒子間距離の中間点
t1、t2 絶縁性樹脂層厚
Claims (13)
- 第1接続層が、主として絶縁性樹脂からなる第2接続層と第3接続層とに挟持された3層構造の異方性導電フィルムであって、
第1接続層が、絶縁性樹脂層の第2接続層側の平面方向に導電粒子が単層で配列された構造を有し、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている異方性導電フィルム。 - 第1接続層が、アクリレート化合物と熱又は光ラジカル重合開始剤とを含む熱又は光ラジカル重合型樹脂層又はそれを熱又は光ラジカル重合させたもの、またはエポキシ化合物と熱又は光カチオン若しくはアニオン重合開始剤とを含む熱又は光カチオン若しくはアニオン重合型樹脂層又はそれを熱又は光カチオン重合若しくはアニオン重合させたものである請求項1記載の異方性導電フィルム。
- 導電粒子が、第2接続層に食い込んでいる請求項1又は2記載の異方性導電フィルム。
- 第1接続層において、導電粒子と第1接続層の第3接続層側表面との間に位置する領域の第1接続層の硬化率が、互いに隣接する導電粒子間に位置する領域の第1接続層の硬化率よりも低い請求項1~3のいずれかに記載の異方性導電フィルム。
- 第1接続層の最低溶融粘度が、第2接続層及び第3接続層のそれぞれの最低溶融粘度よりも高い請求項1~4のいずれかに記載の異方性導電フィルム。
- 第1接続層の最低溶融粘度の、第2接続層及び第3接続層のそれぞれの最低溶融粘度に対する比が1:4~400である請求項5記載の異方性導電フィルム。
- 導電粒子の厚み方向端部と第2接続層までの水平方向の最短距離が、粒子径の0.5~1.5倍である請求項1~6のいずれかに記載の異方性導電フィルム。
- 請求項1記載の異方性導電フィルムの製造方法であって、以下の工程(A)~(D):
工程(A)
開口が形成された転写型の開口内に導電粒子を配置し、開口が形成された転写型の表面に、剥離フィルム上に形成された絶縁性樹脂層を対向させる工程;
工程(B)
剥離フィルム側から絶縁性樹脂層に対して圧力をかけ、開口内に絶縁性樹脂を押し込んで絶縁性樹脂層の表面に導電粒子を転着させ、それにより、絶縁性樹脂層の平面方向に導電粒子が単層で配列された構造であって、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層を形成する工程;
工程(C)
第1接続層の導電粒子側表面に、主として絶縁性樹脂からなる第2接続層を形成する工程; 及び
工程(D)
第2接続層と反対側の第1接続層の表面に、主として絶縁性樹脂からなる第3接続層を形成する工程
を有する製造方法。 - 請求項1記載の異方性導電フィルムの製造方法であって、以下の工程(a)~(c):
<工程(a)>
開口が形成された転写型の開口内に導電粒子を配置し、開口が形成された転写型の表面に、予め第3接続層が貼り合わされた絶縁性樹脂層を対向させる工程;
<工程(b)>
剥離フィルム側から絶縁性樹脂層に対して圧力をかけ、開口内に絶縁性樹脂を押し込んで絶縁性樹脂層の表面に導電粒子を転着させ、それにより、絶縁性樹脂層の平面方向に導電粒子が単層で配列された構造であって、隣接する導電粒子間の中央領域の絶縁性樹脂層厚が、導電粒子近傍の絶縁性樹脂層厚よりも薄くなっている第1接続層を形成する工程;
及び
<工程(c)>
第1接続層の導電粒子側表面に、主として絶縁性樹脂からなる第2接続層を形成する工程
を有する製造方法。 - 工程(B)と工程(C)との間に、第1接続層に対し、導電粒子側から紫外線を照射する工程を更に有する請求項8記載の製造方法。
- 工程(b)と工程(c)との間に、第1接続層に対し、導電粒子側から紫外線を照射する工程を更に有する請求項9記載の製造方法。
- 請求項1~7のいずれかに記載の異方性導電フィルムで第1電子部品を第2電子部品に異方性導電接続してなる接続構造体。
- 請求項1~7のいずれかに記載の異方性導電フィルムで第1電子部品を第2電子部品に異方性導電接続する接続方法であって、
第2電子部品に対し、異方性導電フィルムをその第3接続層側から仮貼りし、仮貼りされた異方性導電フィルムに対し、第1電子部品を搭載し、第1電子部品側から熱圧着する接続方法。
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