WO2019117258A1 - 実装構造体の製造方法およびこれに用いられるシート - Google Patents
実装構造体の製造方法およびこれに用いられるシート Download PDFInfo
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- WO2019117258A1 WO2019117258A1 PCT/JP2018/045941 JP2018045941W WO2019117258A1 WO 2019117258 A1 WO2019117258 A1 WO 2019117258A1 JP 2018045941 W JP2018045941 W JP 2018045941W WO 2019117258 A1 WO2019117258 A1 WO 2019117258A1
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Definitions
- the present invention relates to a method of manufacturing a mounting structure, and more particularly, to a method of manufacturing a sealed mounting structure and a sheet used for sealing.
- circuit members mounted on a circuit board require a space between them and the circuit board.
- a SAW chip used to remove noise from a mobile phone or the like mounts an electrode on a piezoelectric body and a SAW chip in order to filter a desired frequency using a surface wave propagating on a piezoelectric substrate (piezoelectric body).
- a space is required between the circuit board and the When sealing a circuit member (hollow member) having a space (internal space) in such an inside, a sheet-like sealing material may be used.
- Patent Document 1 proposes a sheet having a large ratio of an entering speed between circuit members having an interval of 100 ⁇ m and an entering speed into an internal space having a height from the circuit board of 20 ⁇ m.
- One aspect of the present invention provides a mounting member including a first circuit member and a plurality of second circuit members mounted on the first circuit member; Arranging the thermosetting sheet and the thermoplastic sheet on the mounting member such that the thermosetting sheet is interposed between the thermoplastic sheet and the first circuit member; The laminate of the thermosetting sheet and the thermoplastic sheet is pressed against the first circuit member, and the laminate is heated to seal the second circuit member, and the thermosetting sheet is formed.
- the present invention relates to a method for manufacturing a mounting structure in which a plurality of second circuit members are sealed while maintaining the space in the first sealing step.
- thermosetting sheet used to seal a mounting member including a first circuit member and a plurality of second circuit members mounted on the first circuit member, At least one of the plurality of second circuit members is a hollow member including a space formed between the plurality of second circuit members and the first circuit member,
- the sheet comprising a thermosetting sheet and a thermoplastic sheet integrated with the thermosetting sheet; At the temperature t when the second circuit member is sealed, the thermosetting sheet has a loss tangent tan ⁇ of 0.1 or more and 0.8 or less, and a storage shear elastic modulus of 1 ⁇ 10 4 Pa The sheet relates to at least 1 ⁇ 10 7 Pa.
- the plurality of circuit members including the hollow member can be collectively sealed while maintaining the internal space.
- a method of manufacturing a mounting structure includes the steps of preparing a mounting member including a first circuit member and a plurality of second circuit members mounted on the first circuit member; A placement step of placing the sheet and the thermoplastic sheet on the mounting member, pressing the laminate of the thermosetting sheet and the thermoplastic sheet against the first circuit member, and heating the laminate to form a second circuit A sealing step (first sealing step) for sealing the member and a removing step for removing the thermoplastic sheet are included.
- at least one of the plurality of second circuit members is a hollow member including a space formed between the plurality of second circuit members and the first circuit member, and in the first sealing step, the plurality of The two circuit members are sealed.
- thermosetting sheet and the thermoplastic sheet are used as the sealing material in a laminated state, the gaps between the plurality of circuit members are not broken by the plastic deformation of the thermoplastic sheet. While being able to make the laminated
- each sheet may be prepared, or a sheet in which the thermosetting sheet and the thermoplastic sheet are integrated may be prepared (sheet preparing step).
- sheet preparing step a sheet in which the thermosetting sheet and the thermoplastic sheet are integrated
- thermosetting material may be filled on the cured layer and cured (second sealing step).
- Another aspect of the present invention also includes a mounting structure manufactured by the above manufacturing method.
- Still another aspect of the present invention also includes the above-described sheet used to seal the mounting member.
- the thermosetting sheet and the thermoplastic sheet may be integrated.
- Another aspect of the present invention also includes the use of the above sheet for sealing the mounting member.
- FIGS. 1 to 8 are schematic views for explaining the predetermined steps in the manufacturing method according to the above aspect of the present invention with reference to the cross section of the mounting member or the mounting structure.
- a mounting member including a first circuit member 1 and a plurality of second circuit members 2 mounted on the first circuit member 1 is prepared (FIG. 1).
- the first circuit member 1 is, for example, at least one selected from the group consisting of a semiconductor element, a semiconductor package, a glass substrate, a resin substrate, a ceramic substrate, and a silicon substrate. These first circuit members may have a surface on which a conductive material layer such as ACF (anisotropic conductive film) or ACP (anisotropic conductive paste) is formed.
- the resin substrate may be a rigid resin substrate or a flexible resin substrate, and examples thereof include an epoxy resin substrate (for example, a glass epoxy substrate), a bismaleimide triazine substrate, a polyimide resin substrate, a fluorine resin substrate and the like.
- the first circuit member 1 may be a component built-in substrate including a semiconductor chip or the like inside.
- the second circuit member 2 includes a reference member 21, a first adjacent member 22 adjacent to the reference member 21, and a second adjacent member 23 adjacent to the reference member 21.
- the separated distance D1 between the reference member 21 and the first adjacent member 22 and the separated distance D2 between the reference member 21 and the second adjacent member 23 may be different as shown in the illustrated example. It may be the same.
- the height ⁇ H1 of the first adjacent member 22 from the reference member 21 and the height ⁇ H2 of the second adjacent member 23 from the reference member 21 may be different as in the illustrated example, and are the same. It is also good.
- the separation distances D1 and D2 are different, and / or the heights ⁇ H1 and ⁇ H2 are different, the size and shape of the unevenness formed by the first circuit member 1 and the second circuit member 2 are nonuniform. Therefore, it is difficult for the sheet to follow, and it is difficult to seal all at once while maintaining the internal space. According to the above aspect of the present invention, even in such a case, since the sheet can be made to follow the unevenness while maintaining the internal space, it is possible to seal all at once.
- three second circuit members 2 are provided in the illustrated example, the present invention is not limited to this case. For example, two second circuit members 2 may be provided, or four or more.
- the height ⁇ H refers to the height of the highest portion of the reference member 21 (the distance from the first circuit member 1 is the largest) when viewed from the main surface direction of the first circuit member 1 It is the height of the highest part of the adjacent adjacent members, and may be taken into account if it is higher or lower than the reference member 21. For example, when the first adjacent member 22 is higher than the reference member 21 and the second adjacent member 23 is lower than the reference member 21, the first adjacent member 22 and the second adjacent member 23 and the reference member 21 Even if the difference in height is the same, the height ⁇ H1 and the height ⁇ H2 are different.
- the height ⁇ H1 and the height ⁇ H2 are different.
- the ratio of the separation distance D2 to the separation distance D1 may be 200% or more, or 300% or more.
- the separation distance D is the shortest distance between the reference member 21 and the adjacent member (in the illustrated example, the adjacent member 22 or 23) when viewed from the normal direction of the main surface of the first circuit member 1 It is a distance.
- the separation distance D is appropriately set according to the size of the first circuit member 1, the number of the second circuit members 2, the size, the arrangement method and the like, and is not particularly limited, but according to the sheet 4P, the separation distance is narrow ( For example, even when the separation distance is 150 ⁇ m or less) or when the height of the second circuit member is high (for example, when the height is 200 ⁇ m or more), the second circuit members 2 may be collectively sealed. it can.
- the lower limit of the separation distance D may be appropriately set according to the thickness of the sheet 4P, but may be, for example, 10% or more and 4000% or less of the thickness T of the sheet 4P.
- the separation distance D is in such a range with respect to the thickness T of the sheet 4P, the sheet 4P can be easily inserted by the gap between the second circuit members.
- the separation distance D may be, for example, 10 ⁇ m or more and 6 mm or less, or 10 ⁇ m or more and 2000 ⁇ m or less.
- the mounting member preferably includes at least a portion having a separation distance D of, for example, 400 ⁇ m or less (preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less or 100 ⁇ m or less) from the viewpoint of narrowing pitch, high density mounting, etc. . According to the above aspect of the present invention, even when the separation distance D is small as described above, it is possible to perform batch sealing of circuit members with high sealing performance.
- the ratio of the height of the first adjacent member 22 to the height of the second adjacent member 23 is 200% or more It may be 300% or more.
- the second circuit members 2 can be collectively sealed.
- the height of the first adjacent member 22 is the distance from the portion of the first adjacent member 22 farthest from the first circuit member 1, and the height of the second adjacent member 23 is the second adjacent member 23. Is the distance from the first circuit member 1 to the farthest part.
- the second circuit member 2 includes a hollow member (in the illustrated example, the reference member 21 and the second adjacent member 23) mounted on the first circuit member 1 via the bumps 3.
- An internal space S is formed between the first circuit member 1 and the hollow member.
- the hollow member is an electronic component that needs to be sealed (hollow sealing) in a state in which the internal space S is maintained.
- RFIC RFIC
- SAW sensor chip
- a piezoelectric vibrator chip a quartz vibrator chip, a MEMS device etc.
- 2nd circuit members 2 other than a hollow member FBAR, BAW, a chip
- the mounting member is a chip on board (CoB) structure (chip on wafer (CoW), chip on film (CoF) structure in which the second circuit member 2 is mounted on various first circuit members 1 (Including chip on glass (CoG)), chip on chip (CoC) structure, chip on package (CoP) structure and package on package (PoP) structure.
- the mounting member may be a multilayer mounting member in which the first circuit member 1 and / or the second circuit member 2 are further stacked on the first circuit member 1 on which the second circuit member 2 is mounted.
- the bumps 3 have conductivity, and the first circuit member 1 and the hollow member are electrically connected via the bumps 3.
- the height of the bumps 3 is not particularly limited, but may be, for example, 5 ⁇ m or more and 150 ⁇ m or less.
- the material of the bumps 3 is also not particularly limited as long as it has conductivity, and examples thereof include copper, gold, and solder balls.
- thermosetting sheet 41P and a thermoplastic sheet 42P are prepared (FIG. 1).
- the illustrated example shows the case where the sheet 4P in which the thermosetting sheet 41P and the thermoplastic sheet 42P are integrated is prepared, the invention is not limited to this case, and the thermosetting sheet 41P and the thermoplastic sheet 42P are separately prepared. May be When the thermosetting sheet 41P and the thermoplastic sheet 42P are prepared separately, both sheets may be stacked in a subsequent arrangement step to form a laminate.
- thermosetting sheet 41P and the thermoplastic sheet 42P are not integrated, and the configuration of each sheet and the procedure and conditions of each step of the method of manufacturing the mounting structure are as follows: The same as in the case of the integrated sheet 4P.
- the sheet 4P is a member for collectively sealing the plurality of second circuit members 2.
- the sheet 4P may be used in a state where the thermosetting sheet 41P and the thermoplastic sheet 42P are stacked in the subsequent arrangement step, and may include other sheets (third sheet) other than these sheets 41P and 42P. it can.
- the plurality of second circuit members 2 including the hollow members and arranged at various intervals can be collectively sealed while maintaining the internal space S of the hollow members.
- the sheet-like sealing material is less likely to enter the gap between the circuit members.
- the sheet 4P has elasticity to such an extent that it does not enter the internal space S, and viscosity to such an extent that it can extend between the second circuit members 2 regardless of the magnitude of the separation distance.
- the sheet 4P When the sheet 4P is used, even if the heights of the plurality of second circuit members 2 from the first circuit member 1 are different from one another, the plurality of second circuit members 2 can be used while maintaining the internal space S of the hollow member. It becomes possible to seal collectively.
- the sheet 4P has a viscosity that allows the sheet 4P to extend toward the first circuit member 1 in a small gap. Therefore, once it is possible to enter between the second circuit members 2, the sheet 4 P can be extended to reach the surface of the first circuit member 1 regardless of the height of the second circuit members 2.
- thermosetting sheet 41P facing the second circuit member 2 or the thermoplastic sheet 42P adjacent thereto. Therefore, at least one of the thermosetting sheet 41P and the thermoplastic sheet 42P, the loss tangent tan ⁇ of the material constituting the sheet and the storage shear elastic modulus G ′ at the temperature t when the second circuit member 2 is sealed. And may be controlled to a specific range.
- the loss tangent tan ⁇ at the temperature t when the second circuit member 2 is sealed is 0.1 or more and 0.8 or less
- the storage shear elastic modulus G ′ is controlled to satisfy 1 ⁇ 10 4 Pa or more and 1 ⁇ 10 7 Pa or less.
- the thermosetting material constituting the thermosetting sheet satisfy the loss tangent tan ⁇ and the storage shear elastic modulus G ′ in that the internal space S having various shapes and arrangements can be easily maintained.
- the sheet according to an embodiment of the present invention preferably includes a thermosetting sheet composed of a thermosetting material having such loss tangent tan ⁇ and storage shear modulus G ′.
- the temperature t when the second circuit member 2 is sealed is the temperature of the sheet 4P when the surface of the second circuit member 2 is covered by the sheet 4P in the state where the internal space S is maintained. is there.
- the loss tangent tan ⁇ is the ratio of the storage shear modulus G 'of the material comprising the sheet at temperature t to the loss shear modulus (G "): G" / G'.
- the storage shear modulus G ′ and the loss shear modulus G ′ ′ can be measured by a visco-elasticity measuring device according to JIS K 7244-1: 1998.
- the rate G ′ ′ is measured on a test piece with a diameter of 8 mm and a thickness of 1 mm using a visco-elasticity measuring apparatus (for example, ARES-LS2 manufactured by TA Instruments) under a condition of a frequency of 1 Hz and a heating rate of 10 ° C./min. Ru.
- ARES-LS2 manufactured by TA Instruments
- thermosetting sheet 41P and the thermoplastic sheet 42P when physical property values and the like of each of the thermosetting sheet 41P and the thermoplastic sheet 42P are measured, a test piece may be prepared for each sheet before integration, or integration If it is difficult to make a test piece with each sheet before conversion, each sheet separated from sheet 4P may be used as described above.
- the method of separating each sheet is not particularly limited. For example, in sheet 4P, one of thermosetting sheet 41P and thermoplastic sheet 42P may be separated by peeling it from the other, and the other sheet is removed. One sheet may be recovered.
- the test pieces used when measuring the physical property values and the like may be produced from the sheets separated in this manner.
- the loss tangent tan ⁇ 1 at the temperature t of the thermosetting material constituting the thermosetting sheet 41P may be, for example, 0.1 or more and 0.6 or less, and may be 0.1 or more and 0.4 or less.
- the storage shear elastic modulus G1 ′ at the temperature t of the thermosetting material may be 1 ⁇ 10 4 Pa or more and 1 ⁇ 10 7 Pa or less, and 1 ⁇ 10 4 Pa or more and 5 ⁇ 10 6 or less (for example, 1 ⁇ 10 5 Pa or more and 5 ⁇ 10 6 Pa or less) or 1 ⁇ 10 4 Pa or more and 1 ⁇ 10 6 Pa or less.
- the volume resistivity of the thermosetting sheet 41P is preferably 1 ⁇ 10 8 ⁇ ⁇ cm or more, and more preferably 1 ⁇ 10 10 ⁇ ⁇ cm or more.
- the volume resistivity of the thermosetting sheet 41P can be measured, for example, using a commercially available device such as a resistivity meter (for example, Hiresta UP, manufactured by Mitsubishi Chemical Analytech Co., Ltd.).
- the thickness T1 of the thermosetting sheet 41P is not particularly limited. Among them, the thickness T1 is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less, and may be 50 ⁇ m or less. Thereby, even when the separation distance between the second circuit members 2 is small, they can easily enter between them, and the height of the mounting structure 10 can be reduced. The thickness T1 is preferably 5 ⁇ m or more in that the internal space S is easily maintained.
- the thickness T1 of the thermosetting sheet 41P is the distance between the main surfaces of the thermosetting sheet 41P. The distance between the main surfaces can be determined by averaging the distances at any 10 points.
- the thickness T2 of the thermoplastic sheet 42P is also determined according to the case of T1. The thicknesses T1 and T2 of the sheets 41P and 42P and the thickness of the sheet 4P are thicknesses before pressing on the first circuit member.
- the elongation (average elongation) at 25 ° C. of the thermosetting material before curing is not particularly limited, it is preferably 50% or more and 3000% or less.
- the thermosetting sheet 41P can easily enter between the second circuit members 2.
- the elongation percentage of a thermosetting material is a value measured about the test piece of 30 mm length, 10 mm width, and 100 micrometers thickness sheeted according to the case of the thermosetting sheet 41P.
- the elongation rate is measured for a plurality of (for example, 5) test pieces, and the average elongation rate is determined by averaging.
- the thermosetting sheet 41P is made of a thermosetting material.
- a thermosetting material 1st thermosetting material
- the resin composition etc. which contain a thermosetting resin and a hardening agent are mentioned, for example.
- the thermosetting resin before sealing may be uncured or semi-cured.
- the semi-cured state is a state in which the thermosetting resin contains monomers and / or oligomers, and refers to a state in which the development of the three-dimensional crosslinked structure of the thermosetting resin is insufficient.
- the thermosetting resin in the semi-cured state is not dissolved in the solvent at room temperature (25 ° C.), but the curing is incomplete, that is, in the so-called B-stage.
- thermosetting resin is not particularly limited, and epoxy resin, acrylic resin, phenol resin, melamine resin, silicone resin, urea resin, urethane resin, vinyl ester resin, unsaturated polyester resin, diallyl phthalate resin, polyimide resin, etc. It can be mentioned. One of these may be used alone, or two or more of these may be used in combination. Among them, epoxy resin is preferable.
- the epoxy resin is not particularly limited.
- An added bisphenol F epoxy resin, phenol novolac epoxy resin, naphthalene epoxy resin, alicyclic aliphatic epoxy resin, glycidyl ether of organic carboxylic acids, and the like can be used. These may be used alone or in combination of two or more.
- the epoxy resin may be a prepolymer, or may be a polyether-modified epoxy resin or a copolymer of an epoxy resin such as a silicone-modified epoxy resin and another polymer.
- bisphenol AD type epoxy resin bisphenol AD type epoxy resin, naphthalene type epoxy resin, bisphenol A type epoxy resin and / or bisphenol F type epoxy resin are preferable.
- bisphenol A epoxy resin and bisphenol F epoxy resin are preferable in that they are excellent in heat resistance and water resistance and inexpensive.
- An epoxy resin can contain about 0.1 mass% or more and 30 mass% or less with respect to the whole epoxy resin about the monofunctional epoxy resin which has one epoxy group in a molecule, for viscosity adjustment of a resin composition.
- monofunctional epoxy resin phenyl glycidyl ether, 2-ethylhexyl glycidyl ether, ethyl diethylene glycol glycidyl ether, dicyclopentadiene glycidyl ether, 2-hydroxyethyl glycidyl ether, etc. can be used. These may be used alone or in combination of two or more.
- the resin composition contains a curing agent of a thermosetting resin.
- the curing agent is not particularly limited, for example, a phenol-based curing agent (phenol resin etc.), a dicyandiamide-based curing agent (dicyandiamide etc.), a urea-based curing agent, an organic acid hydrazide-based curing agent, a polyamine salt-based curing agent, an amine adduct
- a system curing agent, an acid anhydride curing agent, an imidazole curing agent, etc. can be used. These may be used alone or in combination of two or more.
- the type of curing agent is appropriately selected according to the thermosetting resin. Among them, it is preferable to use a phenolic curing agent from the viewpoints of low outgassing at the time of curing, moisture resistance, heat cycle resistance and the like.
- the amount of curing agent depends on the type of curing agent.
- the curing agent is used in an amount such that the equivalent number of functional groups of the curing agent is 0.001 equivalent or more and 2 equivalents or less, and further 0.005 equivalent or more and 1.5 equivalents or less per 1 equivalent of epoxy group. May be used.
- the dicyandiamide-based curing agent, the urea-based curing agent, the organic acid hydrazide-based curing agent, the polyamine salt-based curing agent, and the amine adduct-based curing agent are latent curing agents.
- the active temperature of the latent curing agent may be 60 ° C. or higher, and may be 80 ° C. or higher.
- the activation temperature may be 250 ° C. or less, and may be 180 ° C. or less. When the activation temperature is in such a range, a resin composition that cures rapidly above the activation temperature can be easily obtained.
- the activation temperature is a temperature at which the curing of the thermosetting resin is rapidly accelerated by the action of the latent curing agent and / or the curing accelerator.
- the resin composition may contain a third component other than the above.
- the third component include thermoplastic resins, inorganic fillers, curing accelerators, polymerization initiators, ion catchers, flame retardants, pigments, silane coupling agents, and thixotropic agents.
- Thermoplastic resins can be formulated as sheeting agents. By making the resin composition into a sheet, the handleability in the sealing step is improved, and sagging or the like of the resin composition is suppressed, and the internal space S is easily maintained.
- thermoplastic resin for example, acrylic resin, phenoxy resin, polyolefin, polyurethane, polyether, polyester, polyimide, polyvinyl acetate or its saponified product (including polyvinyl alcohol), butyral resin, polyamide, polyvinyl chloride, Polyvinylidene chloride, cellulose, thermoplastic epoxy resin, thermoplastic phenolic resin and the like can be mentioned.
- acrylic resins are preferable in that they are excellent in the function as a sheet forming agent.
- the amount of the thermoplastic resin may be 5 parts by mass or more and 200 parts by mass or less and 10 parts by mass or more and 100 parts by mass or less per 100 parts by mass of the thermosetting resin.
- the form of the thermoplastic resin at the time of adding to the resin composition is not particularly limited.
- the thermoplastic resin may be, for example, particles having an average particle diameter of 0.01 ⁇ m to 200 ⁇ m (or 0.01 ⁇ m to 100 ⁇ m).
- the particles may have a core-shell structure.
- the core may be, for example, a polymer containing a unit derived from at least one monomer selected from the group consisting of n-, i- and t-butyl (meth) acrylate, or the like It may be a polymer containing units derived from acrylates.
- the shell layer is made of, for example, monofunctional monomers such as methyl (meth) acrylate, n-, i- or t-butyl (meth) acrylate, (meth) acrylic acid and polyfunctional monomers such as 1,6-hexanediol diacrylate And copolymers thereof.
- monofunctional monomers such as methyl (meth) acrylate, n-, i- or t-butyl (meth) acrylate, (meth) acrylic acid and polyfunctional monomers such as 1,6-hexanediol diacrylate And copolymers thereof.
- a high purity thermoplastic resin dispersed or dissolved in a solvent may be added to the resin composition.
- the average particle size is a particle size (D50, hereinafter the same) at a cumulative volume of 50% in the volume-based particle size distribution.
- the inorganic filler examples include silica such as fused silica, talc, calcium carbonate, titanium white, bengala, silicon carbide, boron nitride (BN), alumina and the like. Among them, fused silica is preferable in that it is inexpensive.
- the average particle size (D50) of the inorganic filler is, for example, 0.01 ⁇ m or more and 100 ⁇ m or less.
- the amount of the inorganic filler may be 1 part by mass or more and 5000 parts by mass or less and 10 parts by mass or more and 3000 parts by mass or less per 100 parts by mass of the thermosetting resin.
- the curing accelerator is not particularly limited, and examples thereof include a modified imidazole curing accelerator, a modified aliphatic polyamine accelerator, and a modified polyamine accelerator.
- the curing accelerator may be used as a reaction product (adduct) with a resin such as an epoxy resin. These may be used alone or in combination of two or more.
- the activation temperature of the curing accelerator is preferably 60 ° C. or more, more preferably 80 ° C. or more, from the viewpoint of storage stability. The activation temperature may be 250 ° C. or less, and may be 180 ° C. or less.
- the amount of curing accelerator depends on the type of curing accelerator. Generally, it may be 0.1 parts by mass or more and 20 parts by mass or less, and may be 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the epoxy resin.
- the quantity of a hardening accelerator means the net quantity of the hardening accelerator except components (an epoxy resin etc.) other than a hardening accelerator.
- the polymerization initiator develops curability by light irradiation and / or heating.
- a radical generator an acid generator, a base generator, etc.
- benzophenone compounds, hydroxyketone compounds, azo compounds, organic peroxides, sulfonium salts such as aromatic sulfonium salts and aliphatic sulfonium salts can be used.
- the amount of the polymerization initiator may be 0.1 parts by mass or more and 20 parts by mass or less, and may be 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the epoxy resin.
- the viscoelasticity (that is, loss tangent tan ⁇ ) of the first thermosetting material can be adjusted, for example, by the material of the thermosetting sheet 41P.
- the loss tangent tan ⁇ can be changed by changing the amount and the type of the thermoplastic resin as the sheet forming agent. Among them, when a phenoxy resin is used, it is possible to easily reduce the storage shear modulus G ′ and to increase tan ⁇ .
- the thermosetting sheet 41P may have a single layer structure or a multilayer structure of two or more layers. In the case of a multilayer structure, at least two adjacent layers may differ in composition (such as the type and / or content of components). The content of each component may be such that the content in each layer satisfies the above range. The thickness of each layer may be adjusted so that the thickness T1 of the thermosetting sheet 41P satisfies the above range.
- thermoplastic sheet 42P A third sheet other than these may be disposed between the thermoplastic sheet 42P and the thermosetting sheet 41P. However, it is preferable that the thermoplastic sheet 42P and the thermosetting sheet 41P be adjacent to each other so that the plurality of second circuit members 2 can be easily sealed together while maintaining the internal space S of the hollow member.
- the thickness of the thermoplastic sheet 42P is not particularly limited. From the viewpoint of facilitating the maintenance of the internal space S and making the sheet 4P follow the gaps between the plurality of second circuit members, the thickness T2 of the thermoplastic sheet 42P is preferably 50 ⁇ m to 500 ⁇ m, More preferably, it is 100 ⁇ m or more and 400 ⁇ m or less.
- the thermoplastic sheet 42P is made of various materials (thermoplastic materials) having thermoplasticity.
- thermoplastic materials a thermoplastic resin or a resin composition containing a thermoplastic resin and an additive may be used, but the thermoplastic material is not limited as long as it has thermoplasticity.
- thermoplastic resin the thermoplastic resin illustrated as a sheet forming agent of the thermosetting sheet 41P can be used. Moreover, you may use vinyl resin, a rubber-like polymer, etc. as a thermoplastic resin. As the thermoplastic resin, one having hot melt adhesion may be used. Among thermoplastic resins, polyolefin resin, polyurethane resin, vinyl resin (ethylene-vinyl acetate copolymer etc.), polyester resin, polyamide resin and the like are preferable, and among these resins, those having hot melt adhesiveness are more preferable. .
- thermoplastic resin is preferable from the viewpoint of facilitating the sheet 4P to easily follow the gap between the second circuit members and smoothly peeling the thermoplastic sheet 42P from the cured product of the thermosetting sheet 41P. From the viewpoint of excellentness, a polyurethane resin is preferred.
- the thermoplastic resin can be used singly or in combination of two or more.
- Melting point (or glass transition temperature) t m of the thermoplastic material constituting the thermoplastic sheet 42P is preferably below the temperature t, and more preferably lower than the temperature t.
- the melting point (or glass transition temperature) t m is, for example, 50 ° C. or more and 150 ° C. or less, and preferably 50 ° C. or more and 130 ° C. or less. If the melting point (or glass transition temperature) t m of the thermoplastic material is in such a range, with easy to secure traceability sheet 4P in the first sealing step, the step of removing the thermoplastic sheet by peeling , It is easy to remove the thermoplastic sheet 42P.
- the melting point (or glass transition temperature) t m of the thermoplastic material is measured by differential scanning calorimetry (JIS K 7121) using a test piece of a thermoplastic sheet at a temperature rising rate of 10 ° C./min. Ru.
- the thermoplastic sheet can contain various additives such as fillers, plasticizers, flame retardants, mold release agents, pigments and the like.
- the thermoplastic sheet may contain one or more additives.
- the viscoelasticity (that is, loss tangent tan ⁇ ) of the thermoplastic material can be adjusted, for example, by the components of the thermoplastic sheet 42P.
- the loss tangent tan ⁇ can be changed by changing the type of thermoplastic resin or additive, the amount of additive, and the ratio of each resin when using a plurality of thermoplastic resins.
- the loss tangent tan ⁇ 2 at the temperature t of the thermoplastic material may, for example, be selected from the range described for tan ⁇ 1 and may be greater than 0.6. tan ⁇ 2 may be greater than 0.9 and 2 or less, or 1 or more and 2 or less.
- the storage shear elastic modulus G2 ′ at the temperature t of the thermoplastic material may be selected from the range described for G1 ′, and may be 0.5 ⁇ 10 4 Pa or more and 1 ⁇ 10 7 Pa or less, 1 ⁇ It may be 10 4 Pa or more and 1 ⁇ 10 6 Pa or less.
- the thermoplastic sheet 42P may have a single layer structure or a multilayer structure of two or more layers. In the case of a multilayer structure, at least two adjacent layers may differ in composition (such as the type and / or content of components). The thickness of each layer may be adjusted so that the thickness T2 of the thermoplastic sheet 42P satisfies the above range. In the case of a multilayer structure, for example, the sheet 4P can easily follow the gap between the second circuit members in at least the layer (layer A1) in contact with the thermosetting sheet 41P, and the thermoplastic sheet 42P is a cured product of the thermosetting sheet 41P. A thermoplastic resin which is easy to remove smoothly from the above may be used, and a thermoplastic resin excellent in the balance of viscoelasticity may be used for the layer (layer A2) adjacent to the layer A1.
- the 50% modulus of the sheet formed of the thermoplastic material is preferably 8 MPa or less, and may be 3 MPa or more and 8 MPa or less. In this case, the sheet 4P can be made to follow even with a minute gap.
- the breaking strength of the sheet formed of a thermoplastic material is preferably 10 MPa or more, and may be 10 MPa or more and 30 MPa or less.
- the breaking elongation of the sheet formed of the thermoplastic material is preferably 100% or more (e.g., 100% or more and 1000% or less), and may be 200% or more and 1000%.
- a sheet according to an embodiment of the present invention preferably comprises a thermoplastic sheet composed of a thermoplastic material exhibiting such 50% modulus, breaking strength and breaking elongation, and such a heat It is particularly preferable that the sheet is a sheet in which the plastic sheet and the thermosetting sheet composed of the thermosetting material having the loss tangent tan ⁇ and the storage shear modulus G ′ are integrated.
- the 50% modulus, the breaking strength, and the breaking elongation are measured using a 100 ⁇ m thick test piece formed of a thermoplastic material.
- a test piece one having a thickness of 100 ⁇ m and a width of 15 mm is usually used, which is sheeted according to the case of the thermoplastic sheet 42P.
- the measurement is performed under the conditions of 50 mm between chucks and 200 mm / min of tensile speed. A commercially available tensile tester may be used for the measurement.
- Each physical property is measured about a plurality (for example, five) test pieces, and an average value is obtained by averaging.
- the above-mentioned ranges of 50% modulus, breaking strength and breaking elongation are all average values.
- the elongation (average elongation) of the thermoplastic material is, for example, 250% or more, and may be 300% or more, and may be 500% or more or 1000% or more.
- the sheet 4P can be made to follow even with a minute gap.
- the upper limit of the elongation percentage of the thermoplastic material is not particularly limited, but is preferably 2000% or less from the viewpoint of easily removing the thermoplastic sheet 42P from the cured product of the thermosetting sheet 41P in the removal step.
- the elongation percentage of the thermoplastic material is measured according to the elongation percentage of the thermosetting material except that it is measured at 25 ° C. on the test piece sheeted according to the case of the thermoplastic sheet 42P. can do.
- the elongation rate is measured for a plurality of (for example, 5) test pieces, and the average elongation rate is determined by averaging.
- the thickness T of the entire sheet 4P is not particularly limited, but is preferably 55 ⁇ m or more and 1500 ⁇ m or less, and may be 100 ⁇ m or more and 1000 ⁇ m or less, and 100 ⁇ m or more and 500 ⁇ m or less in view of easy adhesion to the surface of the second circuit member 2. May be there.
- the loss tangent tan ⁇ 3 at the temperature t of the material constituting the third sheet may be 0.2 or more and 1.0 or less, and the storage shear elastic modulus G3 ′ is It may be 1 ⁇ 10 4 Pa or more and 1 ⁇ 10 7 Pa or less.
- the thermosetting sheet 41P is disposed in the outermost layer so as to face the first circuit board 1, but the third sheet is disposed in the outermost layer on the opposite side of the thermosetting sheet 41P. It is also good.
- the third sheet may have a single layer structure or a multilayer structure of two or more layers.
- the method for producing the sheet 4P is not particularly limited.
- the sheet 4P may be formed by separately forming each of the sheets 41P and 42P and then laminating (laminating method), or may be formed by sequentially coating the material of each sheet (coating method) .
- the sheet 4P may be manufactured by coating the material of the thermosetting sheet 41P on one surface of the thermoplastic sheet 42P.
- each sheet 41P and 42P is formed, for example, in the steps of preparing a solvent paste or a non-solvent paste (hereinafter simply referred to simply as paste) containing the material of each sheet, and forming each sheet from the above paste. And a step (forming step).
- the thermoplastic sheet 42P may be formed by a known thermoplastic sheet molding method such as an extrusion molding method. After the thermosetting sheet 41P and the thermoplastic sheet 42P are respectively formed by such a method, they are laminated in this order. If the paste contains a pregelling agent, gelling takes place during the forming process. The gelation is performed by heating the thin film at a temperature lower than the curing temperature of the material of the thermosetting sheet 41P (for example, 70 ° C. or more and 150 ° C. or less) for 1 minute to 10 minutes after thinning the paste.
- thermosetting sheet 41P is coated on the surface of the thermoplastic sheet 42P to form the thermosetting sheet 41P.
- gelation may occur during the forming process. The gelation may be performed sequentially after forming each thin film from each paste, or may be performed after forming a laminate of thin films.
- each layer is formed by, for example, a die, a roll coater, a doctor blade or the like.
- the viscosity of the paste may be adjusted to be 10 mPa ⁇ s or more and 10000 mPa ⁇ s or less.
- the solvent may be removed thereafter by drying for 70 ° C. or more and 150 ° C. or less, for 1 minute or more and 10 minutes or less. The gelation and the removal of the solvent can be carried out simultaneously.
- thermosetting sheet 41P and the thermoplastic sheet 42P are disposed on the mounting member so that the thermosetting sheet 41P is interposed between the thermoplastic sheet 42P and the first circuit member 1 (FIG. 2). ).
- a laminate of the thermosetting sheet 41P and the thermoplastic sheet 42P may be disposed so as to cover the plurality of second circuit members 2.
- thermosetting sheet 41P and the thermoplastic sheet 42P are not integrated, in this step, the thermosetting sheet on the mounting member so that the thermosetting sheet 41P faces the second circuit member 2 41P and the thermoplastic sheet 42P may be stacked and disposed.
- the third sheet may be disposed at a predetermined position in this step.
- the sheets may be stacked on the mounting member, or may be stacked in advance and disposed on the mounting member.
- the sheet 4P is a single sheet so that the thermosetting sheet 41P faces the second circuit member 2. Are placed on the mounting member.
- thermosetting sheet 41P (First sealing process)
- the laminate (including the sheet 4P) of the thermosetting sheet 41P and the thermoplastic sheet 42P is pressed against the first circuit member 1 (FIGS. 3 and 4), and the sheet 4P is heated.
- the second circuit member 2 on the first circuit member 1 is sealed, and the thermosetting sheet 41P is cured to be converted into a cured layer 41 (FIG. 5).
- the second circuit member 2 is sealed while maintaining the internal space S.
- the thermoplastic sheet 42P is also deformed (or formed) following the shape of the second circuit member 2.
- the thermosetting sheet 41P can also follow the shape of the second circuit member 2 by the deformation of the thermoplastic sheet 42P.
- thermosetting sheet 41P can be made to follow along the shape of the gap between the second circuit members 2 by the plastic deformation of the thermoplastic sheet 42P, and the high adhesion of the thermosetting sheet 41P makes the thermosetting sheet 41P possible. Can be fixed along the shape of the gap between the second circuit members 2. In addition, since the sheet 4P can be extended without being broken by the thermoplastic sheet 42P, high sealing performance can be ensured.
- the pressing of the sheet 4P to the first circuit member 1 may be performed, for example, by using the sheet 4P as a curing temperature of the thermosetting sheet 41P (specifically, the thermosetting material contained in the thermosetting sheet 41P). It takes place with less than heating. As a result, the sheet 4P adheres closely to the surface of the second circuit member 2 and can be easily extended until it reaches the surface of the first circuit member 1 between the second circuit members 2. The reliability of sealing can be improved.
- the heating condition at the time of pressing is not particularly limited, and may be appropriately set according to the pressing method and the type of thermosetting resin.
- the heating is performed, for example, at 40 ° C. to 200 ° C., or 50 ° C. to 180 ° C. (eg, 60 ° C. to 160 ° C.).
- the heating time is not particularly limited, and is, for example, 1 second to 300 minutes (or 3 seconds to 300 minutes).
- pressing may be performed in a pressurized atmosphere (under a pressure higher than 0.1 MPa), may be performed at atmospheric pressure, or a reduced pressure atmosphere (for example, 10 Pa or more and 0.05 MPa or less or 50 Pa or more and 3 kPa or less) You may go there.
- the pressing may be performed by a known method as long as the sheet can be pressed onto the circuit board.
- the pressing may be performed by, for example, a press (a heat press or the like), or may be performed by a laminator or the like.
- the sheet 4P may be made to follow the unevenness due to the second circuit board 2 while pressing the sheet 4P from the opposite side to the first circuit board 1.
- the pressure may be reduced along the space between the sheet 4 ⁇ / b> P and the first circuit board 1, and the sheet 4 ⁇ / b> P may be placed along the unevenness of the second circuit board 2. In any case, when the sheet 4P is heated, the sheet 4P can be easily made to follow the uneven shape of the second circuit board 2.
- the temperature t of the sheet 4P when the second circuit member is sealed can be replaced with the set temperature of the heating unit for the sheet 4P in the first sealing step.
- the heating unit of the sheet 4P is a press
- the temperature of the heating unit is a set temperature of the press.
- the heating unit of the sheet 4P is a heater that heats the first circuit member 1
- the temperature of the heating unit is the set temperature of the heater of the first circuit member 1.
- the temperature t may be changed according to the material etc. of the sheet 4P, but is, for example, between room temperature + 15 ° C. (40 ° C.) and 200 ° C.
- the temperature t may be, for example, 50 ° C. or more and 180 ° C. or less, and may be 60 ° C.
- the pressing time may be, for example, 1 second or more and 300 minutes or less, and 3 seconds or more and 300 minutes or less.
- the thermosetting sheet 41P may be uncured or semi-cured.
- the temperature t is higher than the melting point (or glass transition temperature) t m of the thermoplastic material constituting the thermoplastic sheet 42P. It is preferred that the temperature is also high.
- the sheet 4P may be heated at the above-mentioned curing temperature to cure the thermosetting sheet 41P in the sheet 4P, and the sealing material formed of the cured product 41 may be formed. Thereby, the second circuit member 2 is sealed.
- the conditions for heating the sheet 4P (hardening of the thermosetting sheet 41P) may be appropriately set according to the type of thermosetting material contained in the thermosetting sheet 41P. Curing of the thermosetting sheet 41P is performed, for example, at 50 ° C. to 200 ° C. (or 120 ° C. to 180 ° C.).
- the heating time is not particularly limited, and is, for example, 1 second to 300 minutes (or 60 minutes to 300 minutes).
- the thermoplastic sheet 42P cures the thermosetting sheet 41P from the viewpoint of maintaining high fillability into the gaps between the second circuit members.
- it is molten or softened. That is, it is preferable to cure the thermosetting sheet 41P at a temperature higher than the glass transition temperature (or melting point) of the thermoplastic material.
- thermosetting sheet 41P may be performed separately or simultaneously. For example, after pressing at a temperature lower than the curing temperature of the thermosetting material contained in the thermosetting sheet 41P in a reduced pressure atmosphere, the reduced pressure is released and heated at a higher temperature under atmospheric pressure, the thermosetting sheet 41P may be cured. Alternatively, after pressing at a temperature lower than the curing temperature of the thermosetting material contained in the thermosetting sheet 41P under atmospheric pressure, the thermosetting sheet 41P may be cured by heating at a higher temperature. Alternatively, the thermosetting sheet 41P may be cured during depressurization by pressing at a curing temperature in a depressurized atmosphere.
- the cured product 41 may not be completely thermally cured, and may have a hardness that allows the thermoplastic sheet to be removed in the subsequent removal step. In that case, for example, after the thermoplastic sheet is removed, the cured product 41 may be completely cured. Also, for example, when the second sealing step described later is performed, the cured product 41 may be completely cured in the second sealing step.
- thermoplastic sheet removal process In this step, the thermoplastic sheet 42P is removed from the cured layer 41 formed by curing of the thermosetting sheet 41P in the first sealing step (FIG. 6). Thereby, the mounting structure 10 in which the second circuit member is sealed by the hardened layer 41 is obtained (FIG. 7).
- a removal means of a thermoplastic sheet it may be, for example, removal by dissolution or removal by peeling. The removal by peeling may be chemical peeling or physical peeling.
- the residue may be removed by another removal means.
- FIG. 8) shows the case where the thermoplastic sheet is removed by peeling.
- Peeling of the thermoplastic sheet 42P is performed, for example, at a temperature equal to or lower than the melting point or glass transition temperature of the thermoplastic material constituting the thermoplastic sheet 42P, such as 40 ° C. or less, or room temperature (specifically, 20 ° C. or more and 35 ° C. or less). Is preferred. At such a temperature, the viscosity of the thermoplastic sheet 42P is low and the elasticity is high. Further, in the first sealing step, the thermosetting sheet 41P is cured to lower the adhesiveness. Therefore, the thermoplastic sheet 42P can be easily peeled off from the hardened layer 41 by utilizing the high elasticity of the thermoplastic sheet 42P. Thereby, the tearing of the hardened layer 41 can also be suppressed.
- the curable material (second curable material) may be filled on the cured layer 41 and cured (FIG. 8). This process is referred to as a second sealing process.
- the second circuit member 2 is sealed by the cured layer 41 and the cured layer 50 formed by curing the second curable material.
- the sheet-like sealing material When sealing a circuit member with a sheet-like sealing material, it is preferred that the sheet-like sealing material has physical properties such that it can enter a small gap between the circuit members without entering the internal space.
- the selectivity of the surface state and physical properties of the later sealing material is low.
- unevenness may be formed on the surface of which it is difficult to control the shape.
- the second circuit member 2 is separated from the hardened layer 41 in order to remove the thermoplastic sheet 42P.
- the second curable material does not require the properties required for sealing while maintaining the internal space, thereby improving the material selectivity.
- to control the state of the sealing material after sealing such as flattening the unevenness on the hardened layer 41 or smoothing the surface of the sealing material, or adjusting the thickness of the sealing material, It is also easy to provide functionality. In the case of sealing again with the second curable material, the entire surface or a part thereof may be used.
- thermosetting material A well-known thing can be used as a 2nd curable material.
- a photocurable material may be used or a thermosetting material may be used.
- the curable material may be liquid or sheet-like.
- a resin composition containing a photocurable resin, a curing agent and the like is used.
- a thermosetting material what was illustrated as a 1st thermosetting material is mentioned, for example.
- the thermosetting material of the second curable material may be the same as or different from the first thermosetting material.
- the thermosetting material may be a curable material so as to have functionality such as conductivity, heat dissipation, electromagnetic wave shielding, and electromagnetic wave absorbability.
- the obtained mounting structure 10 may be diced into individual pieces.
- the singulation step may be performed for each second circuit member.
- Example 1 On a glass epoxy substrate (first circuit member, 50 mm square, thickness 0.2 mm), four SAW chips A, B, C, D (second circuit member, 1.1 mm ⁇ 1.1 mm, height 0.
- a mounting member was obtained by mounting 2 mm) side by side via gold bumps (diameter 100 ⁇ m, height 20 ⁇ m).
- the separation distance D1 between the SAW chips A and B is 0.4 mm
- the separation distance D2 between the SAW chips B and C is 0.1 mm
- the separation distance D3 between the SAW chips C and D was 0.2 mm.
- the obtained mounting member was sealed with a laminate sheet (a laminate of a thermosetting sheet (first layer) and a thermoplastic sheet (second layer)).
- the laminated sheet is disposed such that the surface of the thermosetting sheet (first layer) is in contact with the second circuit member side, and the laminated sheet is heated at 120 ° C. (sealing temperature) under a reduced pressure atmosphere ( The pressure was applied for 1 minute at 200 Pa). Thereafter, after heating in an oven under conditions of 150 ° C. and 1 atm ( ⁇ 0.1 MPa) for 180 minutes, the thermoplastic sheet (second layer) was peeled off after cooling to room temperature to obtain a mounting structure.
- thermosetting sheet As a lamination sheet, what laminated
- thermoplastic sheet a sheet of olefin resin was used.
- the thermosetting sheet was produced by the coating method using the resin composition which contains the following components by the following ratio (mass reference
- Epoxy resin thermosetting resin: 100 parts Phenolic novolac (hardening agent): 60 parts
- thermoplastic material had a 50% modulus at 25 ° C. of 7.0 MPa, a breaking elongation of 600%, a breaking strength of 25.0 MPa, and a melting point (t m ) of 100 ° C.
- thermosetting sheet (12 ⁇ m in thickness) used in Example 1 is used as the first layer, and as the second layer, a resin composition containing the components shown in Table 1 at the ratios shown in Table 1 is used.
- the thermosetting sheet 250 micrometers in thickness
- Both thermosetting sheets were laminated and thermally laminated in the same manner as in Example 1 to form a laminated sheet.
- the phenoxy resin used in Reference Example 1 is a thermoplastic resin. The physical property values of the materials constituting each sheet were measured according to the procedures described above.
- thermoplastic sheet an olefin resin sheet having the characteristics shown in Table 1 was used.
- sealing temperature was changed to the temperature shown in Table 1.
- a mounting structure was obtained in the same manner as in Example 1 except for these.
- the physical-property value was measured in the procedure as stated above about the material which comprises each sheet
- peelability The surface (the surface of the sealing material after peeling) of the cured layer (first layer) of the mounting structure after peeling the second layer is observed, and the peelability of the second layer is based on the following criteria. (Removability) was evaluated. A: The second layer was completely removed from the surface of the first layer. B: Although peeling of the second layer from the first layer was attempted, peeling could not be performed.
- Table 1 also shows the physical properties of each sheet or the material constituting it, the raw material composition of the thermosetting sheet, and the sealing temperature.
- the manufacturing method and sheet according to the above aspect of the present invention can collectively seal a plurality of circuit members while maintaining the internal space.
- a plurality of circuit members are arranged at narrow intervals or different intervals, and / or when a plurality of circuit members having different heights are arranged, collective sealing can be performed while maintaining the internal space. It is.
- the above-described manufacturing method and sheet are suitable for sealing circuit members in various applications.
- first circuit member 2 second circuit member 21: reference member 22: first adjacent member 23: second adjacent member 3: bump S: internal space 4P: sheet 41P: heat Curable sheet 42P: Thermoplastic sheet 41: Cured product of thermosetting sheet (sealing material) 50: Cured product of second curable material
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Abstract
Description
熱硬化性シートと熱可塑性シートとを、前記熱可塑性シートと前記第1回路部材との間に前記熱硬化性シートが介在するように前記実装部材に配置する配置工程と、
前記熱硬化性シートと前記熱可塑性シートとの積層体を前記第1回路部材に対して押圧するとともに、前記積層体を加熱して前記第2回路部材を封止し、前記熱硬化性シートを硬化させて硬化層に変換する第1封止工程と、
前記硬化層から前記熱可塑性シートを除去する除去工程と、を具備し、
複数の前記第2回路部材の少なくとも1つが、前記第1回路部材との間に形成される空間を備える中空部材であり、
前記第1封止工程では、前記空間を維持しながら、複数の前記第2回路部材が封止される、実装構造体の製造方法に関する。
複数の前記第2回路部材の少なくとも1つが、前記第1回路部材との間に形成される空間を備える中空部材であり、
前記シートが、熱硬化性シートと、前記熱硬化性シートに一体化された熱可塑性シートと、を備え、
前記第2回路部材が封止されるときの温度tにおいて、前記熱硬化性シートは、損失正接tanδが0.1以上0.8以下であり、かつ、貯蔵せん断弾性率が1×104Pa以上1×107Pa以下である、シートに関する。
図1~図8は、それぞれ、本発明の上記局面にかかる製造方法における所定の工程について、実装部材あるいは実装構造体の断面により説明するための模式図である。
本工程では、第1回路部材1と、第1回路部材1に搭載される複数の第2回路部材2と、を備える実装部材を準備する(図1)。
本工程では、熱硬化性シート41Pおよび熱可塑性シート42Pを備えるシート(シート状封止材)4Pを準備する(図1)。図示例では、熱硬化性シート41Pおよび熱可塑性シート42Pが一体化されたシート4Pを準備する場合を示すが、この場合に限らず、熱硬化性シート41Pおよび熱可塑性シート42Pをそれぞれ別に準備してもよい。熱硬化性シート41Pおよび熱可塑性シート42Pを別々に準備する場合には、双方のシートを、後続の配置工程で重ねて積層体としてもよい。この場合でも、第2準備工程において、熱硬化性シート41Pと熱可塑性シート42Pとが一体化していないだけで、各シートの構成、および実装構造体の製造方法の各工程の手順や条件は、一体化されたシート4Pの場合と同様である。
シート4Pは、複数の第2回路部材2を一括して封止する部材である。
シート4Pは、熱硬化性シート41Pおよび熱可塑性シート42Pを後続の配置工程で重ねた状態で用いることができればよく、これらのシート41P,42P以外の他のシート(第3シート)を含むこともできる。
なお、第2回路部材2が封止されるときの温度tとは、内部空間Sが維持された状態で、第2回路部材2の表面がシート4Pによって覆われたときのシート4Pの温度である。
熱硬化性シート41Pを構成する熱硬化性材料の温度tにおける損失正接tanδ1は、例えば、0.1以上0.6以下であり、0.1以上0.4以下であってもよい。また、熱硬化性材料の温度tにおける貯蔵せん断弾性率G1’は、1×104Pa以上1×107Pa以下であってもよく、1×104Pa以上5×106以下(例えば、1×105Pa以上5×106Pa以下)であってもよく、1×104Pa以上1×106Pa以下であってもよい。
熱硬化性シート41Pの体積抵抗率は、例えば、抵抗率計(例えば、(株)三菱化学アナリテック社製、ハイレスタUP)などの市販の装置を用いて測定することができる。
なお、各シート41Pおよび42Pの厚みT1およびT2、並びにシート4Pの厚みは、それぞれ、第1回路部材に対して押圧する前の厚みである。
なお、熱硬化性材料の伸び率とは、熱硬化性シート41Pの場合に準じてシート化された30mm長さ、10mm幅、および100μm厚みの試験片について測定される値である。まず、粘弾性測定装置(例えば、TA Instruments社製、ARES)を用いて、25℃にて、一定Hencky歪モードの条件下、治具(Extensional Viscosity Fixture)を用い、せん断速度0.1s-1で伸び率を測定する。伸び率は、試験片に亀裂が生じたときの試験片の長さL1と初期の試験片の長さL0との差(=L1-L0)のL0に対する比率(=(L1-L0)/L0×100(%))である。複数(例えば、5つ)の試験片について、伸び率を測定し、平均化することにより平均伸び率を求める。
封止前の熱硬化性樹脂は、未硬化状態でもよく、半硬化状態でもよい。半硬化状態とは、熱硬化性樹脂がモノマーおよび/またはオリゴマーを含む状態であり、熱硬化性樹脂の三次元架橋構造の発達が不十分な状態をいう。半硬化状態の熱硬化性樹脂は、室温(25℃)では溶剤に溶解しないが硬化は不完全な状態、いわゆるBステージにある。
本明細書中、活性温度とは、潜在性硬化剤および/または硬化促進剤の作用により、熱硬化性樹脂の硬化が急速に早められる温度である。
また、本明細書中、平均粒子径は、体積基準の粒度分布における累積体積50%における粒子径(D50。以下同じ。)である。
熱可塑性シート42Pと熱硬化性シート41Pとの間には、これらの以外の第3シートが配置されていてもよい。しかし、中空部材の内部空間Sを維持しながら、複数の第2回路部材2を一括して封止し易くなるように、熱可塑性シート42Pと熱硬化性シート41Pとを隣接させることが好ましい。
なお、熱可塑性材料の融点(またはガラス転移温度)tmは、熱可塑性シートの試験片を用いて、昇温速度10℃/分の条件で、示差走査熱量測定法(JIS K7121)により測定される。
シート4P全体の厚みTは特に限定されないが、第2回路部材2の表面に密着させ易い点で、55μm以上1500μm以下であることが好ましく、100μm以上1000μm以下であってよく、100μm以上500μm以下であってよい。
本工程では、熱硬化性シート41Pと熱可塑性シート42Pとを、熱可塑性シート42Pと第1回路部材1との間に熱硬化性シート41Pが介在するように、実装部材に配置する(図2)。このとき、熱硬化性シート41Pと熱可塑性シート42Pとの積層体(シート4Pも含む)が、複数の第2回路部材2を覆うように配置すればよい。
本工程では、熱硬化性シート41Pと熱可塑性シート42Pとの積層体(シート4Pも含む)を第1回路部材1に対して押圧するとともに(図3および図4)、シート4Pを加熱して、第1回路部材1上の第2回路部材2を封止し、熱硬化性シート41Pを硬化させて硬化層41に変換する(図5)。これにより、内部空間Sを維持しながら、第2回路部材2が封止される。このように積層体で第2回路部材2を封止する際には、熱可塑性シート42Pも第2回路部材2の形状に追随して変形する(または成形される)。この熱可塑性シート42Pの変形により、熱硬化性シート41Pも第2回路部材2の形状に追随させることができる。
また、押圧は、加圧雰囲気(0.1MPaより高い圧力下)で行なってもよく、大気圧下で行ってもよいし、減圧雰囲気(例えば、10Pa以上0.05MPa以下または50Pa以上3kPa以下)で行ってもよい。
本工程では、第1封止工程で熱硬化性シート41Pの硬化により形成された硬化層41から、熱可塑性シート42Pを除去する(図6)。これにより、第2回路部材が硬化層41で封止された実装構造体10が得られる(図7)。熱可塑性シートの除去手段としては、例えば、溶解による除去であってもよいし、剥離による除去であってもよい。剥離による除去は、化学的な剥離であってもよいし、物理的な剥離であってもよい。また一度目の除去手段で熱可塑性シートの残渣が生じる場合は、別の除去手段により残渣を除去してもよい。なお、図8)には、熱可塑性シートを剥離により除去する場合を示した。
熱可塑性シート42Pの剥離は、例えば、熱可塑性シート42Pを構成する熱可塑性材料の融点またはガラス転移温度以下、例えば40℃以下、もしくは室温(具体的には、20℃以上35℃以下)の温度で行なうことが好ましい。このような温度では、熱可塑性シート42Pの粘性が低く、弾性が高い。また、第1封止工程において、熱硬化性シート41Pは硬化して粘着性が低下する。そのため、熱可塑性シート42Pの高い弾性を利用して、硬化層41から熱可塑性シート42Pを容易に剥離させることができる。これにより、硬化層41の破れも抑制できる。
熱可塑性シートの除去工程の後、必要により、硬化層41上に硬化性材料(第2硬化性材料)を充填して、硬化させてもよい(図8)。この工程を第2封止工程と称する。第2回路部材2は、硬化層41と第2硬化性材料の硬化により形成される硬化層50とで封止されることになる。
以下、本発明を実施例および参考例に基づいて具体的に説明するが、本発明は以下の実施例に限定されるものではない。
ガラスエポキシ基板(第1回路部材、50mm角、厚み0.2mm)に、4つの同型のSAWチップA,B,C,D(第2回路部材、1.1mm×1.1mm、高さ0.2mm)を、金バンプ(直径100μm、高さ20μm)を介し、並べて搭載することにより実装部材を得た。SAWチップAとBとの間の離間距離D1は0.4mmであり、SAWチップBとCとの間の離間距離D2は0.1mmであり、SAWチップCとDとの間の離間距離D3は0.2mmであった。得られた実装部材を積層シート(熱硬化性シート(第1層)と熱可塑性シート(第2層)との積層体)で封止した。封止工程では、積層シートを熱硬化性シート(第1層)の面が第2回路部材側に接するよう配置し、積層シートを120℃(封止温度)で加熱しながら、減圧雰囲気下(200Pa)で1分間加圧した。その後、150℃、1atm(≒0.1MPa)、180分間の条件でオーブン内にて加熱後、室温まで冷却してから熱可塑性シート(第2層)を剥離し、実装構造体を得た。
エポキシ樹脂(熱硬化性樹脂):100部
フェノールノボラック(硬化剤):60部
アクリル樹脂(熱可塑性樹脂):60部
溶融球状シリカ(無機充填剤):100部
イミダゾール(硬化促進剤):2部
積層シートとして、いずれも熱硬化性の第1層および第2層を有する積層体を用いるとともに、冷却後に剥離を行わないこと以外は、実施例1と同様に実装構造体を得た。積層シートとしては、実施例1で用いた熱硬化性シート(厚み12μm)を第1層とし、第2層としては、表1に示す成分を表1に示す比率で含む樹脂組成物を用いて、コーティング法により作製した熱硬化性シート(厚み250μm)を用いた。双方の熱硬化性シートを重ね合わせて、実施例1の場合と同様に熱ラミネートすることにより積層シートを形成した。なお、参考例1で用いたフェノキシ樹脂は、熱可塑性樹脂である。各シートを構成する材料について、それぞれ既述の手順で、物性値を測定した。
熱可塑性シートとして、表1に示す特性を有するオレフィン系樹脂シートを用いた。また、封止温度を表1に示す温度に変更した。これら以外は、実施例1と同様に実装構造体を得た。なお、各シートを構成する材料について、それぞれ既述の手順で、物性値を測定した。
実施例および参考例について下記の評価を行った。
(1)封止性
実装構造体について、SAWチップの離間距離D1、D2およびD3のそれぞれの部分について、チップ下(基板裏)から中空封止状態を確認し、中空封止性を下記の基準で評価した。
A:未充填によるボイドや樹脂進入がなく、中空封止性が十分であった。
B:樹脂侵入はないが、一部に、未充填によるごく小さなボイドが見られた。
C:チップ下に樹脂が侵入していた。
D:樹脂の未充填による大きなボイドが発生していた。
第2層を剥離した後の、実装構造体の硬化層(第1層)の表面(剥離後の封止材表面)を観察し、下記の基準で第2層の剥離性(除去性)を評価した。
A:第1層の表面から第2層が残らず除去できた。
B:第1層から第2層の剥離を試みたが、剥離できなかった。
1:第1回路部材
2:第2回路部材
21:基準部材
22:第1の隣接部材
23:第2の隣接部材
3:バンプ
S:内部空間
4P:シート
41P:熱硬化性シート
42P:熱可塑性シート
41:熱硬化性シートの硬化物(封止材)
50:第2硬化性材料の硬化物
Claims (12)
- 第1回路部材と、前記第1回路部材に搭載される複数の第2回路部材と、を備える実装部材を準備する工程と、
熱硬化性シートと熱可塑性シートとを、前記熱可塑性シートと前記第1回路部材との間に前記熱硬化性シートが介在するように前記実装部材に配置する配置工程と、
前記熱硬化性シートと前記熱可塑性シートとの積層体を前記第1回路部材に対して押圧するとともに、前記積層体を加熱して前記第2回路部材を封止し、前記熱硬化性シートを硬化させて硬化層に変換する第1封止工程と、
前記硬化層から前記熱可塑性シートを除去する除去工程と、を具備し、
複数の前記第2回路部材の少なくとも1つが、前記第1回路部材との間に形成される空間を備える中空部材であり、
前記第1封止工程では、前記空間を維持しながら、複数の前記第2回路部材が封止される、実装構造体の製造方法。 - 前記配置工程に先立って、前記熱硬化性シートと前記熱可塑性シートとが一体化されたシートを準備する工程を備え、
前記配置工程において、前記シートを前記実装部材に配置する、請求項1に記載の実装構造体の製造方法。 - 前記第1封止工程において、加熱下で、前記積層体が前記第1回路部材に対して押圧される、請求項1または2に記載の実装構造体の製造方法。
- 前記熱可塑性シートを構成する熱可塑性材料は、前記熱可塑性材料で形成された厚み100μmのシートについて測定される50%モジュラスが、3MPa以上8MPa以下であり、破断伸度が、200%以上1000%以下であり、破断強度が、10MPa以上30MPa以下である、請求項1~3のいずれか1項に記載の実装構造体の製造方法。
- 前記熱可塑性シートを構成する熱可塑性材料の融点またはガラス転移温度tmは、50℃以上130℃以下であり、かつ前記第2回路部材が封止されるときの温度tよりも低い、請求項1~4のいずれか1項に記載の実装構造体の製造方法。
- 前記第2回路部材が封止されるときの温度tにおいて、前記熱硬化性シートを構成する熱硬化性材料は、0.1以上0.8以下の損失正接tanδ、および1×104Pa以上1×107Pa以下の貯蔵せん断弾性率を示す、請求項1~5のいずれか1項に記載の実装構造体の製造方法。
- 互いに隣接する第2回路部材の離間距離が150μm以下である第2回路部材を少なくとも1つ備える、請求項1~6のいずれか1項に記載の実装構造体の製造方法。
- 前記第2回路部材は、基準部材と、前記基準部材にそれぞれ隣接する第1の隣接部材および第2の隣接部材と、を備え、
前記基準部材と前記第1の隣接部材との間の離間距離D1と、前記基準部材と前記第2の隣接部材との間の離間距離D2とは、異なる、請求項1~7のいずれか1項に記載の実装構造体の製造方法。 - 前記第2回路部材は、基準部材と、前記基準部材にそれぞれ隣接する第1の隣接部材および第2の隣接部材と、を備え、
前記第1の隣接部材の前記基準部材からの高さΔH1と、前記第2の隣接部材の前記基準部材からの高さΔH2とは、異なる、請求項1~8のいずれか1項に記載の実装構造体の製造方法。 - 前記第1封止工程において、前記積層体で前記第2回路部材を封止するとともに、前記第2回路部材の形状に追随させて前記熱可塑性シートを変形させる、請求項1~9のいずれか1項に記載の実装構造体の製造方法。
- 第1回路部材と、前記第1回路部材に搭載される複数の第2回路部材と、を備える実装部材を封止するために用いられるシートであって、
複数の前記第2回路部材の少なくとも1つが、前記第1回路部材との間に形成される空間を備える中空部材であり、
前記シートが、熱硬化性シートと、前記熱硬化性シートに一体化された熱可塑性シートと、を備え、
前記第2回路部材が封止されるときの温度tにおいて、前記熱硬化性シートを構成する熱硬化性材料は、0.1以上0.8以下の損失正接tanδ、および1×104Pa以上1×107Pa以下の貯蔵せん断弾性率を示す、シート。 - 前記熱可塑性シートを構成する熱可塑性材料は、前記熱可塑性材料で形成された厚み100μmのシートについて測定される50%モジュラスが3MPa以上8MPa以下であり、破断伸度が200%以上1000%以下であり、破断強度が10MPa以上30MPa以下である、請求項11に記載のシート。
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