WO2012046539A1 - マルチチップ実装用緩衝フィルム - Google Patents
マルチチップ実装用緩衝フィルム Download PDFInfo
- Publication number
- WO2012046539A1 WO2012046539A1 PCT/JP2011/070691 JP2011070691W WO2012046539A1 WO 2012046539 A1 WO2012046539 A1 WO 2012046539A1 JP 2011070691 W JP2011070691 W JP 2011070691W WO 2012046539 A1 WO2012046539 A1 WO 2012046539A1
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- WO
- WIPO (PCT)
- Prior art keywords
- resin layer
- chip
- light
- multichip
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- Y10T428/31663—As siloxane, silicone or silane
Definitions
- the present invention relates to a buffer film for multichip mounting and a method of manufacturing a multichip module using the same.
- a plurality of chip elements such as LED elements are collectively connected to a substrate by heating and pressing with a bonding head via an insulating adhesive or an anisotropic conductive adhesive.
- the heat and pressure applied to each chip element are different due to the difference or variation in the height between chip elements, and the difference or variation in the thickness of the wiring formed on the chip element or the substrate or the bump height.
- a chip element that is not sufficiently heated and pressurized or a chip element that is excessively heated and pressurized may occur. In the former case, connection failure may occur, and in the latter case, the chip element may be damaged.
- a heat-resistant rubber-like elastic body is placed between the substrate and the bonding head as a buffer material in order to cancel the height difference or variation between the chip elements during the connection operation with the bonding head. It has been proposed to heat and press the chip element onto the substrate via a heat-resistant rubber-like elastic body.
- An object of the present invention is to solve the above-described conventional problems, and to ensure good connection reliability without causing misalignment during multichip mounting. .
- the present inventors provide a heat-resistant resin layer to be disposed on the chip element side as a cushioning material to be used in multi-chip mounting, and is relatively resistant to deformation without exceeding a predetermined linear expansion coefficient.
- a resin layer and a flexible resin layer to be disposed on the bonding head side are laminated with a relatively easily deformable flexible resin made of a material having a predetermined Shore A hardness
- the inventors have found that the above object can be achieved, and have completed the present invention.
- the present invention is a multichip mounting buffer film having a heat resistant resin layer and a flexible resin layer formed thereon, and the heat resistant resin layer has a linear expansion coefficient of 80 ppm / ° C. or less.
- the flexible resin layer is formed from a resin material having a Shore A hardness of 10 to 80 according to JIS-K6253.
- the present invention also provides the following steps (A) to (C) in a method of manufacturing a multichip module in which a plurality of chip elements are mounted on a substrate by heating and pressing with a bonding head via an adhesive. ): Process (A) A step of aligning a plurality of chip elements to a substrate via an adhesive and temporarily attaching them; Process (B) A step of arranging the multi-chip mounting buffer film between the chip element and the bonding head such that the heat-resistant resin layer is on the chip element side; Process (C) Provided is a manufacturing method including a step of connecting a plurality of chip elements to a substrate by heating and pressing the substrate with a bonding head via a multi-chip mounting buffer film.
- the buffer film for multichip mounting of the present invention is a heat-resistant resin layer to be disposed on the chip element side, and is a relatively heat-resistant resin layer that does not exceed a predetermined linear expansion coefficient and is not easily deformed.
- the flexible resin layer to be disposed has a structure in which a relatively easily deformable flexible resin made of a material having a predetermined Shore A hardness is laminated. For this reason, when heat-pressing the buffer film with a bonding head in multi-chip mounting, the heat-resistant resin layer in contact with the chip element is difficult to deform, and as a result, it is possible to suppress misalignment of the chip element. It becomes. On the other hand, since the flexible resin layer in contact with the bonding head is easily deformed, the difference in height and variation of the chip elements are canceled, and good heat and pressure are applied to each of the plurality of chip elements. Connection reliability can be ensured.
- FIG. 1 is a schematic cross-sectional view of a multichip mounting buffer film of the present invention.
- FIG. 2 is an explanatory diagram of the multichip module manufacturing method of the present invention.
- FIG. 3 is an explanatory view of the method for manufacturing a multichip module of the present invention in which a multichip mounting buffer film is applied on a single wafer.
- FIG. 4 is an explanatory view of the multichip module manufacturing method of the present invention in which a buffer film for multichip mounting is applied roll-to-roll.
- FIG. 5 is an explanatory diagram of the multichip module manufacturing method of the present invention.
- FIG. 6 is a schematic cross-sectional view of a multichip module obtained by the multichip module manufacturing method of the present invention.
- FIG. 1 is a cross-sectional view of a multichip mounting buffer film 10 having a heat resistant resin layer 1 and a flexible resin layer 2 formed thereon.
- the heat-resistant resin layer 1 constituting the multi-chip mounting buffer film 10 of the present invention is disposed on the chip element side during multi-chip mounting.
- glass is used. It has a linear expansion coefficient of 80 ppm / ° C. or less, preferably 20 to 50 ppm / ° C. in the temperature range below the transition temperature.
- it is more than the minimum of the preferable range of a linear expansion coefficient, height difference thru
- alignment shift can be suppressed more.
- heat-resistant resin layer 1 examples include polyimide resin films (for example, Upilex-25S from Ube Industries, Ltd.), polyester resin films (for example, Teijin Tetron film from Teijin Limited), polyvinyl chloride resin, and the like. Films (for example, Epilon CB3005 from Taihei Chemicals Co., Ltd.), polyolefin resin films (SAN8041 from Tech Jam Co., Ltd.) or fluororesin films (Niftron (polytetrafluoroethylene) from Nitto Denko Corporation) etc. Can be mentioned.
- the layer thickness of the heat-resistant resin layer 1 is preferably 200 ⁇ m or less, and more preferably 10 to 50 ⁇ m, because the difference in height or variation of the chip elements cannot be sufficiently canceled if it is too thick. It should be noted that if it is at least the lower limit of the preferred range of the layer thickness, it is possible to more effectively suppress misalignment, and if it is not more than the upper limit of the preferred range, the height difference or variation of the chip elements etc. can be sufficiently canceled. can do.
- the flexible resin layer 2 constituting the multi-chip mounting buffer film 10 of the present invention is disposed on the bonding head side during multi-chip mounting, and has a Shore A hardness of 10 to 80 according to JIS-K6253. Preferably, it is formed from 40 to 75 resin materials. If the Shore A hardness is within this range, the height difference or variation of the chip element or the like can be sufficiently canceled.
- Such a resin material is preferably a silicone resin material. More preferably, an anion living polymerizable silicone resin composition is mentioned. Specifically, silicones (KE-1281, X-32-2020, Shinetsu Silicone Co., Ltd., XE13-C1822 from MOMENTIVE, etc.), dimethyl silicones (Ker-2600, KER-2500, Shin-Etsu Silicone Co., Ltd.) Is mentioned.
- the layer thickness of the flexible resin layer 2 As the layer thickness of the flexible resin layer 2, if the thickness is too thin, the height difference or variation of the chip element or the like cannot be sufficiently canceled, and good connection reliability cannot be obtained.
- the thickness is preferably 40 to 60 ⁇ m. In addition, if it is more than the lower limit of the preferred range of this layer thickness, the height difference or variation of the chip element etc. can be canceled more fully, and if it is less than the upper limit of the preferred range, good connection reliability is ensured. It becomes possible to do.
- the multi-chip mounting buffer film 10 described above may be provided with another resin layer between the heat-resistant resin layer 1 and the flexible resin layer 2 as long as the effects of the present invention are not impaired.
- the buffer film 10 for multichip mounting of the present invention is manufactured by applying a resin material for forming the flexible resin layer 2 to the film-like heat-resistant resin layer 1 according to a conventional method and drying (or polymerizing) the resin material. can do.
- the multichip mounting buffer film 10 of the present invention is a method for manufacturing a multichip module in which a plurality of chip elements are mounted on a substrate by applying heat and pressure using a bonding head via an adhesive. It can be preferably applied to.
- This method of manufacturing a multichip module includes the following steps (A) to (C).
- the chip element is aligned and temporarily attached to the substrate via an adhesive.
- a substrate 24 having wirings 22 and bumps 23 formed on a known thermocompression bonding stage 21 made of stainless steel or the like is disposed, and a chip is interposed via an adhesive 25.
- the element 26 is aligned by a flip chip method and temporarily attached. There are no particular restrictions on the alignment operation and temporary sticking operation itself of the chip element 26, and the alignment operation and temporary sticking operation in the conventional multichip module manufacturing method can be applied.
- Examples of the chip element 26 applicable to the manufacturing method of the present invention include an IC element and an LED (light emitting diode) element.
- the substrate 24 on which the wirings 22 and the bumps 23 are formed includes wirings formed from various metal materials, transparent electrode materials such as ITO, etc. by a printing method, a dry plating method, a wet plating method, a photolithography method, and the like. Examples thereof include a glass substrate, a plastic substrate, and a ceramic substrate having gold bumps formed by vapor deposition, plating, printing, bonder method (stud bump), and bumps such as solder bumps.
- a known insulating adhesive paste (NCP) or film (NCF), anisotropic conductive paste (ACP) or film (ACF) can be used.
- NCP insulating adhesive paste
- ACP anisotropic conductive paste
- ACF film
- the chip element 26 is an LED element
- Such an anisotropic conductive adhesive having light reflectivity preferably contains light reflective acicular insulating particles. The details will be described again after the description of the step (C).
- the multi-chip mounting buffer film 10 of the present invention is disposed between the chip element 26 and a bonding head 27 which preferably has a metal pressure-bonding surface and includes a heater.
- the heat-resistant resin layer 1 of the multichip mounting buffer film 10 is arranged on the chip element 26 side.
- the multi-chip mounting buffer film 10 may be applied as a single wafer as shown in FIG. 3, but is preferably applied as roll-to-roll as shown in FIG. If it is roll-to-roll, the exchange operation of the buffer film 10 for multichip mounting will become easy, and productivity can be improved.
- anisotropic conductive adhesive having light reflectivity that can be preferably applied as the adhesive 25 will be described in detail.
- An adhesive that can be preferably applied when the chip element is an LED element is a light-reflective anisotropic conductive adhesive, a thermosetting resin composition, conductive particles, and a light-reflective needle having an aspect ratio within a predetermined range. Insulating particles are included. By using acicular particles as the light-reflective insulating particles, cracks in the anisotropic conductive adhesive can be prevented and high connection reliability can be obtained.
- thermosetting resin composition contains spherical particles
- the internal stress of the thermosetting resin composition is reduced when the stretchability of the resin composition decreases (hardens) as the temperature changes.
- cracks are likely to occur at the interface between the spherical particles and the thermosetting resin composition.
- connection reliability is impaired. Therefore, the light-reflective anisotropic conductive adhesive is required to have excellent toughness.
- the needle-shaped light-reflective insulating particles having an aspect ratio within a predetermined range are used as a thermosetting resin composition.
- thermosetting resin composition the needle-like light-reflective insulating particles arranged in random directions are easy to bend and bend themselves, so that the thermosetting resin accompanying the temperature change.
- the internal stress of the composition can be propagated and absorbed in the needle-like crystal, and the internal stress can be suppressed from being transmitted to the thermosetting resin composition. Therefore, the light-reflective anisotropic conductive adhesive containing light-reflective needle-like insulating particles exhibits excellent toughness, and even if the thermosetting resin composition expands or contracts due to a temperature change, Peeling of the adhesive surface can be suppressed.
- Such light-reflective needle-like insulating particles are preferably made of a needle-like inorganic compound exhibiting white color, and reflect light incident on the light-reflective anisotropic conductive adhesive to the outside.
- the light-reflective needle-like insulating particles themselves exhibit white color, the wavelength dependence of the reflection characteristics with respect to visible light can be reduced, and visible light can be efficiently reflected.
- Such a light-reflective anisotropic conductive adhesive exhibits white particles and particles made of an inorganic compound having an acicular shape with an aspect ratio in a predetermined range (hereinafter referred to as “white acicular inorganic particles”).
- white acicular inorganic particles By containing, the reduction of the reflectance with respect to the light emitted from the light emitting element can be suppressed to maintain the light emitting efficiency of the light emitting element, and cracks and the like can be prevented to obtain high connection reliability.
- the white needle-like inorganic particles include zinc oxide whiskers, titanium oxide whiskers, potassium titanate whiskers, titanate whiskers such as titanate whiskers, aluminum borate whiskers, and wollastonite (kaolin silicate needle crystals).
- the zinc oxide whisker has a high whiteness and is a catalyst for photodegradation even when photocuring of the cured product of the thermosetting resin composition in the cured anisotropic conductive adhesive is concerned. It is particularly preferable because it has no property.
- the fiber diameter is preferably 5 ⁇ m or less.
- the aspect ratio of the white needle-like inorganic particles made of single needle crystals is preferably greater than 10 and less than 35, and particularly preferably greater than 10 and less than 20.
- the aspect ratio of the white needle-like inorganic particles is larger than 10, the internal stress of the thermosetting resin composition can be sufficiently propagated and absorbed.
- the aspect ratio of the white needle-like inorganic particles is less than 35, the needle-like crystals are not easily broken and can be uniformly dispersed in the thermosetting resin composition. When this aspect ratio is less than 20, the dispersibility in the thermosetting resin composition can be further improved.
- thermosetting resin composition can be increased by adding white needle-like inorganic particles having an aspect ratio of more than 10 and less than 35 to the thermosetting resin composition, the light reflection Even if the anisotropic anisotropic conductive adhesive expands or contracts, it is possible to suppress the peeling or cracking of the adhesive surface.
- the white needle-like inorganic particles for example, a shape formed by combining the center and the apex of a tetrahedron such as Tetrapod (registered trademark) instead of such a single needle crystal, etc.
- a crystal having a plurality of needle-like shapes may be used.
- the white needle-like inorganic particles of double needle crystals are superior in that they have a higher thermal conductivity than the white needle-like inorganic particles of single needle crystals, but have a bulkier crystal structure than single needle crystals. Therefore, it is necessary to be careful not to damage the substrate or the joined part of the element by the needle-like part during thermocompression bonding.
- the acicular white inorganic particles may be treated with a silane coupling agent, for example. Dispersibility in the thermosetting resin composition can be improved by treating the acicular white inorganic particles with the silane coupling agent. For this reason, the acicular white inorganic particle processed with the silane coupling agent can be mixed in the thermosetting resin composition uniformly in a short time.
- the white needle-like inorganic particles have a refractive index (JIS K7142) that is preferably greater than the refractive index of the cured product of the thermosetting resin composition (JIS K7142), and more preferably at least about 0.02. preferable. This is because if the difference in refractive index is small, the reflection efficiency at the interface between them decreases. That is, as white needle-like inorganic particles, even if they are light-reflective and insulating inorganic particles, their refractive index is less than the refractive index of the thermosetting resin composition used, such as SiO 2. Is not applicable.
- the content is preferably 1 to 50% by volume (Vol%), more preferably 5 to 25% by volume, based on the thermosetting resin composition.
- the light-reflective anisotropic conductive adhesive applicable to the production method of the present invention contains such white needle-like inorganic particles and covers most of the conductive particles, the conductive particles have a color such as brown. Even when presenting, the whiteness of the thermosetting resin composition is realized. Such whiteness reduces the wavelength dependence of the reflection characteristics for visible light and makes it easier to reflect visible light. Therefore, the reflectance of light emitted from the LED element is independent of the type of color of the substrate electrode. In addition, it is possible to efficiently use light emitted from the LED element toward the lower surface side. As a result, the light emission efficiency (light extraction efficiency) of the LED element can be improved.
- the light-reflective anisotropic conductive adhesive described above is a particle made of a spherical inorganic compound exhibiting white (hereinafter referred to as this) as a spherical insulating particle exhibiting white. May be referred to as “white spherical inorganic particles”).
- the thermosetting resin composition can be further whitened to further improve the light extraction efficiency of the LED element.
- the toughness of the thermosetting resin composition can be increased.
- the addition amount (Vol%) of the white needle-like inorganic particles be equal to or more than the addition amount (Vol%) of the white spherical inorganic particles.
- the light-reflective anisotropic conductive adhesive can exhibit excellent toughness even when white spherical inorganic particles are added together with white needle-like inorganic particles. By being able to do, even if it expands and contracts, it can suppress that peeling of an adhesive surface and a crack generate
- metal material particles used in conventional conductive particles for anisotropic conductive connection can be used. That is, examples of the metal material for the conductive particles include gold, nickel, copper, silver, solder, palladium, aluminum, alloys thereof, and multilayered products thereof (for example, nickel plating / gold flash plating). .
- thermosetting resin composition since white needle-like inorganic particles cover most of the conductive particles, the thermosetting resin composition is prevented from exhibiting brown color due to the conductive particles. And the whole thermosetting resin composition comes to exhibit high whiteness.
- metal-coated resin particles obtained by coating resin particles with a metal material may be used.
- resin particles include styrene resin particles, benzoguanamine resin particles, and nylon resin particles.
- a method of coating the resin particles with a metal material a conventionally known method can be employed, and for example, an electroless plating method, an electrolytic plating method, or the like can be used.
- the layer thickness of the metal material to be coated may be any thickness that can ensure good connection reliability, and is usually 0.1 to 3 ⁇ m, although it depends on the particle size of the resin particles and the type of metal.
- the shape of the resin particles is preferably a spherical shape, but may be a flake shape or a rugby ball shape.
- the metal-coated resin particles have a spherical shape, and if the particle size is too large, the connection reliability tends to decrease, so 1 to 20 ⁇ m is preferable, and 3 to 10 ⁇ m is more preferable.
- the conductive particles contained in the light-reflective anisotropic conductive adhesive as described above are, for example, light-reflective conductive particles imparted with light reflectivity as shown in the cross-sectional views of FIGS. 7A and 7B. It is also possible to do.
- the light-reflective conductive particle 100 shown in FIG. 7A includes a core particle 110 coated with a metal material, and titanium oxide (TiO 2 ) particles, zinc oxide (ZnO) particles, or aluminum oxide (Al 2 O 3 ) on the surface thereof. And a light reflection layer 130 formed of at least one kind of inorganic particles 120 selected from the particles.
- the light reflecting layer 130 formed from the inorganic particles 120 exhibits a color in the range from white to gray. For this reason, as described above, the wavelength dependency of the reflection characteristic with respect to visible light is small and the visible light is easily reflected, so that the luminous efficiency of the LED element can be further improved.
- the core particle 110 is used for anisotropic conductive connection, and the surface is made of a metal material.
- the core particle 110 for example, an aspect in which the core particle 110 itself is a metal material, or an aspect in which the surface of the resin particle is coated with a metal material can be exemplified.
- the layer thickness of the light reflecting layer 130 is preferably 0.5 to 50%, more preferably 1 to 25%.
- the particle size of the inorganic particles 120 is preferably 0.02 to 4 ⁇ m, more preferably 0.1 to 1 ⁇ m, and particularly preferably 0.2 to 0.5 ⁇ m. In this case, from the viewpoint of the wavelength of the light to be reflected, the particle size of the inorganic particles 120 is set so that the light to be reflected (that is, the light emitted from the light emitting element) does not pass through.
- examples of the shape of the inorganic particles 120 include an amorphous shape, a spherical shape, a scaly shape, and a needle shape.
- a spherical shape is preferable from the viewpoint of the light diffusion effect
- a scaly shape is preferable from the viewpoint of the total reflection effect. .
- the light-reflective conductive particles 100 are manufactured by a known film formation technique (a so-called mechanofusion method) in which a film made of small particles is formed on the surface of a large particle size particle by physically colliding large and small powders. Can do.
- the inorganic particles 120 are fixed so as to bite into the metal material on the surface of the core particle 110, and on the other hand, since the inorganic particles are hardly fused and fixed, the monolayer of the inorganic particles constitutes the light reflecting layer 130. Therefore, in the case of FIG. 7A, the layer thickness of the light reflecting layer 130 is considered to be equal to or slightly thinner than the particle size of the inorganic particles 120.
- the light-reflective conductive particle 200 shown in FIG. 7B contains a thermoplastic resin 240 in which the light-reflective layer 230 functions as an adhesive, and the inorganic particles 220 are also fixed to each other by the thermoplastic resin 240, so that the inorganic particles 220 are multilayered. It differs from the light-reflective conductive particle 100 in FIG. 7A in that it is (for example, two layers or three layers). By including such a thermoplastic resin 240, the mechanical strength of the light reflection layer 230 is improved, and the inorganic particles are less likely to be peeled off.
- thermoplastic resin 240 a halogen-free thermoplastic resin can be preferably used for the purpose of low environmental load.
- polyolefins such as polyethylene and polypropylene, polystyrene, and acrylic resins can be preferably used.
- Such light-reflective conductive particles 200 can also be manufactured by a mechanical fusion method. If the particle size of the thermoplastic resin 240 applied to the mechanical fusion method is too small, the adhesion function is lowered, and if it is too large, it is difficult to adhere to the core particle 210, so 0.02 to 4 ⁇ m is preferable, and 0.1 to 1 ⁇ m is preferable. Is more preferable. Further, if the blending amount of the thermoplastic resin 240 is too small, the adhesion function is deteriorated, and if it is too large, aggregates of particles are formed. 500 parts by mass is preferable, and 4 to 25 parts by mass is more preferable.
- thermosetting resin composition contained in the light-reflective anisotropic conductive adhesive it is preferable to use a colorless and transparent one as much as possible. This is because the light-reflecting conductive particles in the light-reflective anisotropic conductive adhesive are reflected without lowering the light reflection efficiency and without changing the light color of the incident light.
- the colorless and transparent means that the light-reflective anisotropic conductive adhesive cured product has a light transmittance (JIS K7105) of 80% or more with respect to visible light having a wavelength of 380 to 780 nm, preferably 80% or more. It means 90% or more.
- the blending amount of the conductive particles such as the light-reflective conductive particles with respect to 100 parts by mass of the thermosetting resin composition is too small, poor connection occurs, and if it is too large, short circuit between patterns occurs. Since it tends to occur, 1 to 100 parts by mass is preferable, and 10 to 50 parts by mass is more preferable.
- the light-reflective anisotropic conductive adhesive has a reflectance (JIS K7105) with respect to light having a wavelength of 450 nm of a value higher than 9% by adding white needle-like inorganic particles to the thermosetting resin composition.
- the reflective properties of the light-reflective anisotropic conductive adhesive are adjusted by appropriately adjusting various other factors such as the reflective properties and blending amount of the light-reflective conductive particles, the blending composition of the thermosetting resin composition, and the like.
- a reflectance (JIS K7105) with respect to light having a wavelength of 450 nm is realized at 30% or more. Usually, if the amount of the light-reflective conductive particles having good reflection characteristics is increased, the reflectance tends to increase.
- the reflection characteristics of the light-reflective anisotropic conductive adhesive can be evaluated from the viewpoint of refractive index. That is, when the reflectance of the cured product is larger than the refractive index of the cured product of the thermosetting resin composition excluding the conductive particles and the light-reflective insulating particles, the light-reflective insulating particles and the thermosetting surrounding them. This is because the amount of light reflection at the interface with the cured product of the conductive resin composition increases.
- the difference obtained by subtracting the refractive index of the cured product of the thermosetting resin composition (JIS K7142) from the refractive index of the light-reflective insulating particles (JIS K7142) is preferably 0.02 or more, more preferably Is desirably 0.2 or more.
- the refractive index of the thermosetting resin composition mainly composed of epoxy resin is about 1.5.
- thermosetting resin composition those used in conventional anisotropic conductive adhesives can be used.
- a thermosetting resin composition is obtained by blending an insulating binder resin with a curing agent.
- the insulating binder resin is preferably an epoxy resin mainly composed of an alicyclic epoxy compound, a heterocyclic epoxy compound, a hydrogenated epoxy compound, or the like.
- Preferred examples of the alicyclic epoxy compound include those having two or more epoxy groups in the molecule. These may be liquid or solid. Specific examples include glycidyl hexahydrobisphenol and epoxycyclohexenylmethyl-epoxycyclohexenecarboxylate. Among them, glycidyl hexavidrobisphenol A, 3,4-epoxycyclohexenylmethyl-3 ′, 4 is preferable because it can ensure light transmission suitable for mounting LED elements on the cured product and is excellent in rapid curing. '-Epoxycyclohexenecarboxylate can be preferably used.
- heterocyclic epoxy compound examples include an epoxy compound having a triazine ring, and 1,3,5-tris (2,3-epoxypropyl) -1,3,5-triazine-2,4 is particularly preferable. , 6- (1H, 3H, 5H) -trione.
- hydrogenated epoxy compound hydrogenated products of the above-described alicyclic epoxy compounds and heterocyclic epoxy compounds, and other known hydrogenated epoxy resins can be used.
- the alicyclic epoxy compound, heterocyclic epoxy compound and hydrogenated epoxy compound may be used alone, but two or more kinds may be used in combination.
- other epoxy compounds may be used in combination as long as the effects of the present invention are not impaired.
- the curing agent examples include acid anhydrides, imidazole compounds, and dicyan.
- acid anhydrides that are difficult to discolor the cured product particularly alicyclic acid anhydride-based curing agents, can be preferably used.
- methylhexahydrophthalic anhydride etc. can be mentioned preferably.
- thermosetting resin composition when using an alicyclic epoxy compound and an alicyclic acid anhydride-based curing agent, the respective amounts used are uncured if there is too little alicyclic acid anhydride-based curing agent.
- the epoxy compound increases, and if it is too much, the corrosion of the adherend material tends to be accelerated due to the influence of the excess curing agent. Therefore, the alicyclic acid anhydride-based curing is performed on 100 parts by mass of the alicyclic epoxy compound.
- the agent is preferably used in a proportion of 80 to 120 parts by mass, more preferably 95 to 105 parts by mass.
- the light-reflective anisotropic conductive adhesive can be produced by uniformly mixing the thermosetting resin composition, conductive particles, and white needle-like inorganic particles that are light-reflective insulating particles.
- a thermosetting resin composition, conductive particles, and white needle-like inorganic particles that are light-reflective insulating particles are dispersed and mixed together with a solvent such as toluene. Then, it may be applied to the peeled PET film so as to have a desired thickness and dried at a temperature of about 80 ° C.
- Polyimide resin film Upilex-25S, Ube Industries, Ltd.
- Polyester resin film Teijin Tetron Film, Teijin Limited
- Polyvinyl chloride resin film Epilon CB3005, Taihei Chemicals Co., Ltd.
- Polyolefin resin film SAN8041, TECJAM fluoropolymer film (polytetrafluoroethylene): Niftron, Nitto Denko Corporation Silicone: KE-1281, X-32-2020, Shin-Etsu Silicone Co., Ltd. Silicone: XE13-1822, MOMENTIVE dimethyl silicone: KER-2600, Shin-Etsu Silicone Co., Ltd. Dimethyl silicone: KER-2500, Shin-Etsu Silicone Co., Ltd.
- Thermosetting resin composition comprising white needle-like inorganic particles and conductive particles (particle size 5 ⁇ m) whose surface of a spherical resin is gold-plated, and an epoxy curing adhesive (adhesive binder mainly composed of CEL2021P-MeHHPA) To produce a light-reflective anisotropic conductive adhesive.
- the amount of white needle-like inorganic particles added was 12.0% by volume with respect to the thermosetting resin composition.
- titanium dioxide (TiO 2 ) whiskers having a long direction particle size of 1.7 ⁇ m and a short direction particle size of 0.13 ⁇ m (aspect ratio of 13.1) were used. Moreover, the addition amount of electroconductive particle was 10 mass% with respect to the thermosetting resin composition.
- a buffer film for multichip mounting of Example or Comparative Example is arranged between the temporarily stuck LED chip element and the heating / pressurizing head, and 200 A multi-chip module was obtained by performing main heating and pressing at 30 ° C. for 30 seconds.
- connection resistance of the multichip module immediately after it was obtained was measured using a curve tracer (TCT-2004, Kuniyo Denki Kogyo Co., Ltd.). The obtained results are shown in Table 1.
- TCT thermal cycle test
- connection resistance was again It was measured. The obtained results are shown in Table 1.
- the multichip module manufactured using the multichip mounting buffer films of Examples 1 to 6 has no observed LED chip misalignment, and has good connection reliability at the initial stage and after the TCT1000 cycle. Met. In particular, Example 1 showed better results than the other Examples.
- the multichip module manufactured using the multichip mounting buffer film of Comparative Example 2 had no LED chip misalignment observed, but had a problem in connection reliability because the flexible resin layer was relatively hard. It was.
- the buffer film for multichip mounting of the present invention has a predetermined shore to be disposed on the bonding head side on a heat resistant resin layer that does not exceed a predetermined linear expansion coefficient and is relatively difficult to deform. It has the structure which laminated
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Abstract
Description
工程(A)
複数のチップ素子を、接着剤を介して基板にアライメントし、仮貼りする工程;
工程(B)
チップ素子とボンディングヘッドとの間に、上述のマルチチップ実装用緩衝フィルムを、その耐熱性樹脂層がチップ素子側になるように配置する工程;
工程(C)
マルチチップ実装用緩衝フィルムを介して、複数のチップ素子をボンディングヘッドで基板に対し加熱加圧することにより基板に接続する工程
を有する製造方法を提供する。
まず、チップ素子を、接着剤を介して基板にアライメントし、仮貼りする。具体的には、図2に示すように、ステンレススチール等からなる公知の熱圧着用のステージ21上に配線22とバンプ23とが形成された基板24を配置し、接着剤25を介してチップ素子26をフリップチップ方式でアライメントし、仮貼りする。チップ素子26のアライメント操作並びに仮貼り操作自体については、特に制限はなく、従来のマルチチップモジュールの製造方法におけるアライメント操作並びに仮貼り操作を適用することができる。
次に、図3に示すように、チップ素子26と、好ましくは金属圧着面を有し、ヒーターを備えたボンディングヘッド27との間に、本発明のマルチチップ実装用緩衝フィルム10を配置する。この場合、マルチチップ実装用緩衝フィルム10の耐熱性樹脂層1がチップ素子26側になるようにする。
次に、図5に示すように、マルチチップ実装用緩衝フィルム10を介して、複数のチップ素子26をボンディングヘッド27で基板24に対し加熱加圧する。加熱加圧終了後に、図6に示すマルチチップモジュール50を得ることができる。
(マルチチップ実装用緩衝フィルムの作製)
表1に示す耐熱性樹脂フィルム(耐熱性樹脂層)に、表1のシリコーン系樹脂組成物をスクリーン印刷法により塗布し、120℃で1時間乾燥させて柔軟性樹脂層を形成することにより、マルチチップ実装用緩衝フィルムを作製した。
ポリエステル樹脂フィルム: テイジンテトロンフィルム、帝人(株)
ポリ塩化ビニル樹脂フィルム: エピロンCB3005、太平化学製品(株)
ポリオレフィン樹脂フィルム: SAN8041、(株)テックジャム
フッ素樹脂フィルム(ポリテトラフルオロエチレン):ニフトロン、日東電工(株)
シリコーン: KE-1281、X-32-2020、信越シリコーン(株)
シリコーン: XE13-1822、MOMENTIVE社
ジメチルシリコーン: KER-2600、信越シリコーン(株)
ジメチルシリコーン: KER-2500、信越シリコーン(株)
白色針状無機粒子と、球状樹脂の表面を金メッキ処理した導電粒子(粒径5μm)とをエポキシ硬化系接着剤(CEL2021P-MeHHPAを主成分とした接着性バインダ)からなる熱硬化性樹脂組成物に混合し、光反射性異方性導電接着剤を作製した。白色針状無機粒子の添加量は、熱硬化性樹脂組成物に対して12.0体積%とした。白色針状無機粒子としては、長方向粒径1.7μm、短方向粒径0.13μm(アスペクト比13.1)の二酸化チタン(TiO2)ウィスカを使用した。また、導電粒子の添加量は、熱硬化性樹脂組成物に対して10質量%とした。
100μmピッチの銅配線にNi/Au(5.0μm厚/0.3μm厚)メッキ処理した配線を有し、20個のLED素子を実装可能なガラスエポキシ基板に、バンプホルダ(FB700、カイジョー(株))を用いて10μm高の金(Au)バンプを形成した。この金バンプ付きガラスエポキシ基板に、前述の異方性導電接着剤を15μm厚となるように塗布し、その上に0.3mm角のLEDチップ素子20個を搭載し、仮貼りした。金属製の加熱加圧ヘッドを備えたフリップチップボンダーを用いて、この仮貼りしたLEDチップ素子と加熱加圧ヘッドとの間に実施例又は比較例のマルチチップ実装用緩衝フィルムを配し、200℃で30秒間、本加熱加圧することによりマルチチップモジュールを得た。
まず、得られた直後のマルチチップモジュールの接続抵抗をカーブトレーサー(TCT-2004、國洋電機工業(株))を用いて測定した。得られた結果を表1に示す。次に、マルチチップモジュールを冷熱サイクル試験(TCT:-40℃及び100℃の雰囲気に各30分間曝し、これを1サイクルとする冷熱サイクルを500サイクル又は1000サイクル実施)後、再度、接続抵抗を測定した。得られた結果を表1に示す。
AA: 初期Vf値からのVf値の上昇分が±0.05V未満
A: 初期Vf値からのVf値の上昇分が±0.05V以上±0.07V未満
B: 初期Vf値からのVf値の上昇分が±0.07V以上±0.1V未満
C: 初期Vf値からのVf値の上昇分が±0.1V以上
得られたマルチチップモジュールの外観を顕微鏡を用いて観察し、LEDチップ素子と基板のバンプとの間のずれを観察し、以下の基準で評価した。
AA: LED素子の電極と基板のバンプとの間でずれが全くない場合
A: LED素子の電極と基板のバンプとの間で一部ずれが観察されたが、実用上問題がない場合
B: LED素子の電極と基板のバンプとの間でずれが観察されたが、電気的接続は得られている場合
C: LED素子の電極と基板のバンプとの間で著しくずれが観察され、電気的接続が全くない場合
2 柔軟性樹脂層
10 マルチチップ実装用緩衝フィルム
21 ステージ
22 配線
23 バンプ
24 基板
25 接着剤
26 チップ素子
27 ボンディングヘッド
50 マルチチップモジュール
100,200 光反射性導電粒子
100,210 コア粒子
120,220 無機粒子
120,230 光反射層
240 熱可塑性樹脂
Claims (9)
- 耐熱性樹脂層と、その上に形成された柔軟性樹脂層とを有するマルチチップ実装用緩衝フィルムであって、耐熱性樹脂層が80ppm/℃以下の線膨張係数を有し、柔軟性樹脂層が、JIS-K6253によるショアA硬度が10~80である樹脂材料から形成されたものであるマルチチップ実装用緩衝フィルム。
- 耐熱性樹脂層が、ポリイミド樹脂フィルム、ポリエステル樹脂フィルム、ポリ塩化ビニル樹脂フィルム、ポリオレフィン樹脂フィルム又はフッ素樹脂フィルムである請求項1記載のマルチチップ実装用緩衝フィルム。
- 柔軟性樹脂層を構成する樹脂材料が、アニオンリビング重合性のシリコーン樹脂組成物である請求項1又は2記載のマルチチップ実装用緩衝フィルム。
- 耐熱性樹脂層の層厚が200μm以下であり、柔軟性樹脂層の層厚が10μm以上である請求項1~3のいずれかに記載のマルチチップ実装用緩衝フィルム。
- 基板上に複数のチップ素子を接着剤を介してボンディングヘッドにより加熱加圧することによりマルチチップ実装してなるマルチチップモジュールの製造方法において、以下の工程(A)~(C):
工程(A)
複数のチップ素子を、接着剤を介して基板にアライメントし、仮貼りする工程;
工程(B)
チップ素子とボンディングヘッドとの間に、請求項1~4のいずれかに記載のマルチチップ実装用緩衝フィルムを、その耐熱性樹脂層がチップ素子側になるように配置する工程;
工程(C)
マルチチップ実装用緩衝フィルムを介して、複数のチップ素子をボンディングヘッドで基板に対し加熱加圧することにより接続する工程
を有する製造方法。 - チップ素子が、LED素子である請求項5記載の製造方法。
- マルチチップ実装用緩衝フィルムが、枚葉で適用される請求項5又は6記載の製造方法。
- マルチチップ実装用緩衝フィルムが、ロールツーロールで適用される請求項5又は6記載の製造方法。
- 接着剤が、光反射性針状絶縁粒子を含有する異方性導電接着剤である請求項6~8のいずれかに記載の製造方法。
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| EP11830472.4A EP2626894B1 (en) | 2010-10-07 | 2011-09-12 | Buffering film for multichip mounting |
| CN201180048307.3A CN103155128B (zh) | 2010-10-07 | 2011-09-12 | 多芯片安装用缓冲膜 |
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| Publication number | Publication date |
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| EP2626894A4 (en) | 2016-03-02 |
| HK1185182A1 (zh) | 2014-02-07 |
| CN103155128A (zh) | 2013-06-12 |
| US20140248477A1 (en) | 2014-09-04 |
| US8758546B2 (en) | 2014-06-24 |
| US20130092310A1 (en) | 2013-04-18 |
| JP5614217B2 (ja) | 2014-10-29 |
| EP2626894A1 (en) | 2013-08-14 |
| KR20130120457A (ko) | 2013-11-04 |
| JP2012084582A (ja) | 2012-04-26 |
| TW201216522A (en) | 2012-04-16 |
| CN103155128B (zh) | 2016-02-17 |
| TWI511333B (zh) | 2015-12-01 |
| KR101853151B1 (ko) | 2018-04-27 |
| EP2626894B1 (en) | 2017-07-26 |
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