WO2022191110A1 - 接合シート - Google Patents
接合シート Download PDFInfo
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- WO2022191110A1 WO2022191110A1 PCT/JP2022/009646 JP2022009646W WO2022191110A1 WO 2022191110 A1 WO2022191110 A1 WO 2022191110A1 JP 2022009646 W JP2022009646 W JP 2022009646W WO 2022191110 A1 WO2022191110 A1 WO 2022191110A1
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Images
Classifications
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- B23K35/0233—Sheets, foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K35/0205—Non-consumable electrodes; C-electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/264—Bi as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K35/362—Selection of compositions of fluxes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
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- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
Definitions
- the present invention relates to a joining sheet for solder joining.
- solder material supply material for solder bonding.
- a joint sheet for solder joints is used, for example, as follows. First, a wiring board, a joining sheet, and an electronic component are laminated in this order. The wiring board and the electronic component are temporarily joined via the joining sheet in an arrangement in which the terminals of the wiring board face the terminals of the electronic component. Next, a solder portion is formed between the opposed terminals through a heating process. Specifically, by heating, the thermosetting resin is once softened in the joining sheet, the solder particles are melted and aggregated, gathered between the opposing terminals (self-alignment), and around the gathered solder material Curing of the thermosetting resin proceeds. The solder material gathered between the opposed terminals is solidified by subsequent cooling to form a solder portion. A thermosetting resin forms a cured resin portion around the solder portion.
- the joining sheet described in Patent Document 1 contains flux particles.
- the flux particles are melted in the heating process to remove oxide films on the surfaces of the solder particles. This removal of the oxide film makes the solder particles more likely to agglomerate.
- the flux particles in the bonding sheet cause unevenness on the surface of the bonding sheet.
- the larger the flux particles the larger the surface unevenness of the joining sheet.
- the larger the surface unevenness the weaker the bonding force of the bonding sheet to the wiring board and the electronic component during the temporary bonding described above.
- Insufficient adhesive force of the joining sheet is not preferable because it causes misalignment of the wiring board and the electronic component during temporary joining. Bonding sheets for solder bonding are required not to cause such poor adhesion.
- the present invention provides a joining sheet suitable for suppressing poor adhesion to adherends.
- the present invention [1] includes a bonding sheet containing a matrix resin, solder particles, and a fluxing agent and having a surface with a surface roughness Sa of 2.5 ⁇ m or less.
- the present invention [2] includes the joining sheet according to [1] above, wherein the fluxing agent is a carboxylic acid that is solid at 25°C.
- the present invention [3] includes the joining sheet according to [1] or [2] above, which has a thickness of 30 ⁇ m or less.
- the present invention [4] is the bonded sheet according to any one of [1] to [3] above, wherein the bonded sheet has a tack change rate of -30% or more from the same bonded sheet except that it does not contain the flux agent. including.
- the joining sheet of the present invention contains a matrix resin, solder particles, and a fluxing agent, and has a surface with a surface roughness Sa of 2.5 ⁇ m or less. Therefore, the bonding sheet is suitable for ensuring adhesive strength when bonding to an adherend, and therefore suitable for suppressing poor adhesion to an adherend.
- FIG. 1 shows part of the steps in one embodiment of the method for producing a joined sheet according to the present invention
- FIG. 2A represents the coating film forming process
- FIG. 2B represents the drying process. 1.
- It is process drawing of an example of the solder joint method using the joining sheet shown in FIG. 3A represents the preparation process
- FIG. 3B represents the lamination process
- FIG. 3C represents the heating process.
- FIG. 1 is a schematic cross-sectional view of a joining sheet 10 as one embodiment of the joining sheet of the present invention (illustrating a state in which the joining sheet 10 is sandwiched between base materials S1 and S2).
- the joining sheet 10 is a sheet for solder joining, and contains solder particles, a flux agent, and a matrix resin.
- the joining sheet 10 has a sheet shape with a predetermined thickness and extends in a direction perpendicular to the thickness direction H (plane direction). Also, the joining sheet 10 may have a long sheet shape. When the joining sheet 10 has a long sheet shape, it may have the form of a wound roll. Alternatively, the joining sheet 10 may have a sheet form.
- the solder particles include, for example, solder materials that do not contain lead (lead-free solder) from the viewpoint of environmental suitability.
- solder materials include, for example, tin-bismuth based alloys and tin-silver based alloys.
- Tin-bismuth alloys include, for example, tin-bismuth alloys (Sn-Bi) and tin-bismuth-indium alloys (Sn-Bi-In).
- Tin-silver alloys include, for example, tin-silver alloys (Sn-Ag) and tin-silver-copper alloys (Sn-Ag-Cu). From the viewpoint of low-temperature bonding, tin-bismuth alloy and tin-bismuth-indium alloy are preferably used as the material of the solder particles.
- the solder particles may be used singly or in combination of two or more.
- the content of tin in the tin-bismuth-based alloy is, for example, 10% by mass or more, preferably 20% by mass or more, more preferably 25% by mass or more, and is, for example, 75% by mass or less, preferably 50% by mass or less, More preferably, it is 30% by mass or less.
- the content of bismuth in the tin-bismuth alloy is, for example, 25% by mass or more, preferably 55% by mass or more, and is, for example, 90% by mass or less, preferably 75% by mass or less.
- the indium content is, for example, 8% by mass or more, preferably 12% by mass or more, and more preferably 18% by mass or more. Preferably, it is 25% by mass or less.
- the melting point of the solder material (the melting point of the solder particles) is, for example, 240° C. or lower, preferably 200° C. or lower, more preferably 180° C. or lower, and is, for example, 70° C. or higher, preferably 100° C. or higher, or more. It is preferably 120° C. or higher.
- the melting point of the solder material can be obtained by differential scanning calorimetry (DSC) (the same applies to the melting point of the flux agent material described later).
- the shape of the solder particles includes, for example, a spherical shape, a plate shape, and a needle shape, preferably a spherical shape.
- the particle diameter D50 of the solder particles is preferably 7 ⁇ m or less, more preferably 6 ⁇ m or less, even more preferably 5 ⁇ m or less. Such a configuration is preferable for suppressing sedimentation of the solder particles in the mixed composition described later that is prepared during the manufacturing process of the joining sheet 10, and therefore, the solder particles in the formed joining sheet 10 are well distributed. It is preferable to realize a good dispersion state. Also, the particle diameter D50 of the solder particles with respect to the thickness of the joining sheet 10 is preferably 0.9 or less, more preferably 0.7 or less, and even more preferably 0.5 or less. Such a configuration is preferable for making the bonding sheet 10 thin while suppressing surface unevenness.
- the particle diameter D50 of the solder particles is preferably 10 nm or more.
- the particle diameter D50 of the solder particles is the median diameter in the volume-based particle size distribution (particle size at which the volume cumulative frequency reaches 50% from the small diameter side), for example, based on the particle size distribution obtained by the laser diffraction/scattering method (The same applies to the particle diameter D50 of flux particles, which will be described later).
- the content of the solder particles in the joining sheet 10 is preferably 50 parts by mass or more, more preferably 100 parts by mass or more, and even more preferably 120 parts by mass or more with respect to 100 parts by mass of the matrix resin.
- the volume ratio of the solder particles in the joining sheet 10 is preferably 5% by volume or more, more preferably 10% by volume or more, and even more preferably 15% by volume or more. These configurations are preferable for ensuring the cohesiveness of the solder particles within the joining sheet 10 during the solder joining process.
- the content of the solder particles in the joining sheet 10 is preferably 600 parts by mass or less, more preferably 450 parts by mass or less, and even more preferably 170 parts by mass or less with respect to 100 parts by mass of the matrix resin.
- the volume ratio of the solder particles in the joining sheet 10 is preferably 80% by volume or less, more preferably 50% by volume or less, and even more preferably 30% by volume or less. These configurations are preferable from the viewpoint of ease of production (moldability) of the joining sheet 10 as a sheet member.
- the flux agent is a component that exerts an oxide film removal function on the solder particles in the joining sheet 10 during heating for soldering, and the solder particles are appropriately melted and agglomerated by the oxide film removal.
- Materials for fluxing agents include, for example, organic acids, quinolinol derivatives, and metal carbonyl salts.
- organic acids include carboxylic acids.
- Carboxylic acids include monocarboxylic acids, dicarboxylic acids, and tricarboxylic acids.
- Monocarboxylic acids include, for example, glycolic acid, lactic acid, and 2-hydroxybutanoic acid.
- Dicarboxylic acids include, for example, tartaric acid, malic acid, adipic acid, malonic acid, succinic acid, glutaric acid, pimelic acid, suberic acid, and sebacic acid.
- Tricarboxylic acids include, for example, citric acid.
- a flux agent may be used independently and two or more types may be used together.
- the fluxing agent is preferably a carboxylic acid, more preferably a dicarboxylic acid, still more preferably malic acid, adipic acid and malonic acid, and particularly preferably apple acid, and malonic acid.
- the flux agent is preferably solid at 25°C.
- the melting point of the fluxing agent is higher than 25°C, preferably 80°C or higher, more preferably 100°C or higher, and even more preferably 120°C or higher.
- the melting point of the fluxing agent is, for example, 200° C. or lower, preferably 180° C. or lower, more preferably 160° C. or lower.
- the flaking agent is preferably a carboxylic acid that is solid at 25°C.
- the content of the fluxing agent in the joining sheet 10 is, for example, 10 parts by mass or more, preferably 30 parts by mass or more, and more preferably 40 parts by mass or more with respect to 100 parts by mass of the matrix resin.
- the volume ratio of the fluxing agent in the joining sheet 10 is, for example, 10% by volume or more, preferably 20% by volume or more, and more preferably 30% by volume or more. These configurations are preferable for ensuring the cohesiveness of the solder particles within the joining sheet 10 during the solder joining process.
- the content of the fluxing agent in the joining sheet 10 is, for example, 100 parts by mass or less, preferably 80 parts by mass or less, more preferably 60 parts by mass or less, and still more preferably less than 50 parts by mass with respect to 100 parts by mass of the matrix resin.
- the volume ratio of the fluxing agent in the joining sheet 10 is, for example, 100% by volume or less, preferably 80% by volume or less, and more preferably 50% by volume or less.
- the matrix resin contains a thermosetting resin and a thermoplastic resin in this embodiment.
- the thermosetting resin is preferably liquid at room temperature before curing, and the thermoplastic resin is solid at room temperature.
- thermosetting resins examples include epoxy resins, oxetane resins, thermosetting (meth)acrylic resins, diallyl phthalate resins, thermosetting polyesters, and maleimide resins.
- Thermosetting resins may be used alone, or two or more of them may be used in combination.
- an epoxy resin that is liquid at room temperature before curing is used.
- Epoxy resins include, for example, bisphenol-type epoxy resins, novolac-type epoxy resins, naphthalene-type epoxy resins, fluorene-type epoxy resins, triphenylmethane-type epoxy resins, glycidyl ether-type epoxy resins, and glycidylamine-type epoxy resins.
- bisphenol type epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, and dimer acid-modified bisphenol type epoxy resin.
- novolak-type epoxy resins include phenol novolak-type epoxy resins, cresol novolak-type epoxy resins, and biphenyl-type epoxy resins.
- fluorene-type epoxy resins include bisarylfluorene-type epoxy resins.
- Triphenylmethane-type epoxy resins include, for example, trishydroxyphenylmethane-type epoxy resins.
- the epoxy resin a bisphenol type epoxy resin is preferably used, and a bisphenol A type epoxy resin is more preferably used.
- the epoxy equivalent of the epoxy resin is, for example, 80 g/eq or more, preferably 100 g/eq or more, and is, for example, 500 g/eq or less, preferably 400 g/eq or less.
- the temperature at which the thermosetting resin is cured is, for example, 90°C or higher, preferably 140°C or higher, and is, for example, 250°C or lower, preferably 230°C or lower.
- the proportion of the thermosetting resin in the matrix resin is preferably 50% by mass or more, more preferably 60% by mass or more, and is preferably 90% by mass or less, more preferably 80% by mass or less.
- the proportion of the thermosetting resin in the joining sheet 10 is preferably 30% by volume or more, more preferably 40% by volume or more, and is preferably 70% by volume or less, more preferably 60% by volume or less.
- the matrix resin may further contain a phenol resin as a curing agent for the epoxy resin.
- phenolic resins include, for example, novolak-type phenolic resins and resol-type phenolic resins.
- Novolac-type phenolic resins include, for example, phenol novolak resins, phenol aralkyl resins, cresol novolac resins, tert-butylphenol novolak resins, and nonylphenol novolak resins.
- thermoplastic resins include acrylic resins, styrene-butadiene-styrene copolymers, polybutadiene rubbers, phenoxy resins, polyester resins, thermoplastic polyurethanes, thermoplastic polyimides, thermoplastic polyamides, and polyacetal resins.
- the thermoplastic resin may be used alone or in combination of two or more.
- Acrylic resin is preferably used as the thermosetting resin.
- Acrylic resin is a polymer of monomer components including (meth)acrylic acid alkyl ester.
- (Meth)acrylic acid means acrylic acid and/or methacrylic acid.
- (Meth)acrylic acid alkyl esters include, for example, (meth)acrylic acid alkyl esters having a linear or branched alkyl group having 1 to 20 carbon atoms.
- Examples of such (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, and (meth)acrylic acid.
- the proportion of (meth)acrylic acid alkyl ester in the monomer component is preferably 70% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass or more.
- the ratio of the (meth)acrylic acid alkyl ester in the monomer component is preferably 99.5% by mass or less, more preferably 99% by mass or less.
- the monomer component may contain a copolymerizable monomer that can be copolymerized with the (meth)acrylic acid alkyl ester.
- Examples of copolymerizable monomers include polar group-containing vinyl monomers.
- the polar group-containing vinyl monomer is useful for modifying the acrylic resin, such as ensuring cohesive strength of the acrylic resin.
- Examples of polar group-containing vinyl monomers include hydroxyl group-containing vinyl monomers, carboxy group-containing vinyl monomers, acid anhydride vinyl monomers, sulfo group-containing vinyl monomers, phosphoric acid group-containing vinyl monomers, cyano group-containing vinyl monomers, and glycidyl group-containing vinyl monomers.
- Examples include vinyl monomers, preferably hydroxyl group-containing vinyl monomers.
- Copolymerizable monomers also include aromatic vinyl monomers.
- Aromatic vinyl monomers help solidify acrylic resins at room temperature.
- Aromatic vinyl monomers include, for example, styrene, chlorostyrene, chloromethylstyrene, and ⁇ -methylstyrene, with styrene being preferred.
- the copolymerizable monomers may be used alone, or two or more of them may be used in combination.
- the ratio of the copolymerizable monomer in the monomer component is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and still more preferably 1.0% by mass or more, from the viewpoint of ensuring the effect of using the copolymerizable monomer. It is 5% by mass or more.
- the proportion of the copolymerizable monomer in the monomer component is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less.
- the acrylic resin can be formed by polymerizing the above monomer components.
- the polymerization method includes, for example, solution polymerization, bulk polymerization, and emulsion polymerization, preferably solution polymerization.
- the weight average molecular weight (Mw) of the acrylic resin is, for example, 8,000 or more, preferably 10,000 or more, and is, for example, 2,000,000 or less, preferably 1,500,000 or less.
- the Mw (standard polystyrene conversion value) of the acrylic resin is calculated by GPC.
- the glass transition temperature Tg of the acrylic resin is preferably 30°C or higher, more preferably 50°C or higher, and is, for example, 100°C or lower, preferably 50°C or lower.
- the glass transition temperature (Tg) of the polymer the glass transition temperature (theoretical value) obtained based on the following Fox formula can be used.
- the Fox equation is a relational expression between the glass transition temperature Tg of a polymer and the glass transition temperature Tgi of a homopolymer of monomers constituting the polymer.
- Tg represents the glass transition temperature (° C.) of the polymer
- Wi represents the weight fraction of the monomer i constituting the polymer
- Tgi represents the glass transition of the homopolymer formed from the monomer i.
- Literature values can be used for the glass transition temperature of homopolymers.
- the proportion of the thermoplastic resin in the matrix resin is preferably 10% by mass or more, more preferably 20% by mass or more, and is preferably 50% by mass or less, more preferably 40% by mass or less. Further, the proportion of the thermoplastic resin in the joining sheet 10 is preferably 2% by volume or more, more preferably 5% by volume or more, still more preferably 10% by volume or more, and preferably 50% by volume or less, more preferably It is 30% by volume or less, more preferably 20% by volume or less. These configurations are preferable in order to achieve both the formability of the joining sheet 10 and the joint strength of the joining sheet 10 to the object to be joined that has undergone the solder joining process described later.
- the matrix resin may contain a thermosetting catalyst.
- a thermosetting catalyst is a catalyst that promotes curing of a thermosetting resin by heating.
- Thermal curing catalysts include, for example, imidazole compounds, triphenylphosphine compounds, amine compounds, and trihalogenborane compounds.
- imidazole compounds include 2-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-phenyl-4 -methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-methylimidazole, and 1-cyanoethyl-2-undecylimidazole.
- Triphenylphosphine compounds include, for example, triphenylphosphine, tributylphosphine, diphenyltolylphosphine, tetraphenylphosphonium bromide, methyltriphenylphosphonium bromide, methyltriphenylphosphonium chloride, methoxymethyltriphenylphosphonium, and benzyltriphenylphosphonium. Phenylphosphonium chloride can be mentioned.
- Amine compounds include, for example, monoethanolamine trifluoroborate and dicyandiamide.
- Trihalogenborane compounds include, for example, trichloroborane.
- a thermosetting catalyst may be used independently and two or more types may be used together. As the thermosetting catalyst, imidazole compounds are preferably used, and 1-benzyl-2-phenylimidazole is more preferably used.
- the amount of the thermosetting catalyst is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, and preferably 7 parts by mass with respect to 100 parts by mass of the thermosetting resin. It is not more than 5 parts by mass, more preferably not more than 5 parts by mass.
- the content of the matrix resin in the joining sheet 10 is preferably 40% by volume or more, more preferably 55% by volume or more, and is preferably 80% by volume or less, more preferably 70% by volume or less. Such a configuration is preferable for balancing the susceptibility of molten solder to agglomerate and the susceptibility to formation of separated solder portions during the heating process in solder bonding.
- the joining sheet 10 may contain other components as necessary.
- Other ingredients include, for example, colorants and coupling agents.
- colorants examples include black colorants, cyan colorants, magenta colorants, and yellow colorants.
- the coloring agent may be a pigment or a dye.
- a black coloring agent is preferable from the viewpoint of securing stampability by laser marking or the like.
- black colorants include carbon black, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, and cyanine black.
- a compound that is colored by irradiation with radiation such as ultraviolet rays may be used. Such compounds include, for example, leuco dyes. These colorants may be used alone, or two or more of them may be used in combination.
- the content of the coloring agent in the joining sheet 10 is, for example, 0.01% by mass or more and, for example, 1% by mass or less.
- the thickness of the joining sheet 10 is, for example, 50 ⁇ m or less, preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, even more preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m or less.
- the thickness of the joining sheet 10 is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, from the viewpoint of handleability of the joining sheet 10 .
- the joining sheet 10 has a surface 10a with a surface roughness Sa of 2.5 ⁇ m or less.
- the surface roughness Sa is preferably 1.5 ⁇ m or less, more preferably 1 ⁇ m or less, still more preferably 0.7 ⁇ m or less, and particularly preferably less than 0.5 ⁇ m.
- the surface roughness Sa is a three-dimensional arithmetic average roughness, and is determined by the method described later with regard to the examples.
- the surface roughness Sa is, for example, 0.01 ⁇ m or more.
- the bonded sheet 10 has a tack change rate of preferably -30% or more, more preferably -20% or more, and even more preferably -15 from the same bonded sheet (reference bonded sheet) except that it does not contain the flux agent described above. % or more, particularly preferably ⁇ 5% or more, particularly preferably 0% or more (the tack change rate is the rate of change in tack of the joined sheet 10 based on the tack of the reference joined sheet). .
- a tack change rate is the rate of change in tack of the joined sheet 10 based on the tack of the reference joined sheet).
- the joining sheet 10 can be manufactured by the following manufacturing method.
- This manufacturing method is an embodiment of the bonded sheet manufacturing method of the present invention.
- the first solvent is a solvent capable of dissolving the fluxing agent, and is selected according to the type of fluxing agent.
- the flux agent can also be used as a powder without being dissolved in a solvent.
- the first solvent is not limited as long as it dissolves the fluxing agent.
- the first solvent include polar solvents and low-polarity solvents.
- Polar solvents include, for example, water, alcohols, and carboxylic acids.
- Alcohols include, for example, methanol, ethanol, isopropyl alcohol, and butanol.
- Carboxylic acids include formic acid and acetic acid.
- Low polarity solvents include, for example, methyl ethyl ketone and methyl isobutyl ketone.
- the first solvent is preferably a polar solvent, more preferably alcohol, and even more preferably ethanol.
- the particle diameter D50 of the fluxing agent used in this step is not particularly limited, and is, for example, 10 nm or more and 100 ⁇ m or less. In this manufacturing method, since the flux agent is dissolved in the first solvent in this step, even relatively large flux particles can be appropriately used as the flux agent.
- the fluxing agent concentration (non-volatile component concentration) of the fluxing agent solution is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass, from the viewpoint of miscibility with other components in the second step. % by mass or more, preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 35% by mass or less.
- the second solvent is a different type of solvent from the first solvent and has a lower polarity than the first solvent.
- the second solvent is preferably a solvent in which at least part of the fluxing agent dissolves.
- Second solvents include, for example, ketones, alkyl esters, aliphatic hydrocarbons, and aromatic hydrocarbons. Ketones include, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone.
- Alkyl esters include, for example, methyl acetate, ethyl acetate, butyl acetate, isobutyl acetate, and amyl acetate.
- Aliphatic hydrocarbons include, for example, n-hexane, n-heptane, octane, cyclohexane, and methylcyclohexane.
- Aromatic hydrocarbons include, for example, toluene, xylene, and ethylbenzene.
- the second solvent may be used alone, or two or more of them may be used in combination.
- the solid content concentration of the mixed composition is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 65% by mass or more, from the viewpoint of ease of forming a coating film in the following third step. and preferably 80% by mass or less, more preferably 75% by mass or less.
- the mixed composition is applied onto the substrate S1 to form a coating film 10A, and then, as shown in FIG. 2B, the coating film 10A is dried to form the joining sheet 10.
- the substrate S1 include a plastic film.
- the plastic film include polyethylene terephthalate film, polyethylene film, polypropylene film, and polyester film.
- the surface of the base material is preferably surface release treated.
- the joining sheet 10 is dried by heating.
- the drying temperature is equal to or higher than the softening temperature of the thermoplastic resin, lower than the melting points of the solder particles and the fluxing agent, and lower than the curing temperature of the thermosetting resin.
- the drying temperature is preferably 60° C. or higher, more preferably 75° C. or higher, and preferably 130° C. or lower, more preferably 120° C. or lower.
- the base material S2 may be laminated on the joining sheet 10 on the base material S1.
- the plastic film described above regarding the substrate S1 can be used (FIG. 1 illustrates a state in which the joining sheet 10 is sandwiched between the substrates S1 and S2).
- the joining sheet 10 can be manufactured as described above.
- the flux agent is dissolved in the first solvent in the first step.
- the fluxing agent is dissolved in the first solvent and mixed with other components (components of the matrix resin, solder particles).
- a coating film is formed on the substrate S1 from the mixed composition containing the fluxing agent in the dissolved state.
- the surface unevenness due to the inclusion of the fluxing agent is suppressed. Therefore, even in the joining sheet 10 formed by drying the coating film, the surface unevenness due to the inclusion of the fluxing agent is suppressed.
- Such a bonding sheet manufacturing method is suitable for manufacturing a bonding sheet 10 containing a matrix resin, solder particles, and a fluxing agent and having a surface 10a with a surface roughness Sa of 2.5 ⁇ m or less.
- FIG. 3 shows an example of a solder joint method using the joint sheet 10.
- a wiring board 30, an electronic component 40, and a joining sheet 10 are prepared (preparation step).
- the wiring substrate 30 is an example of one bonding object, and has a substrate 31 and a plurality of terminals 32 .
- the substrate 31 is, for example, an insulating substrate having a flat plate shape.
- the terminal 32 is made of metal.
- the multiple terminals 32 are separated from each other.
- the maximum length of the terminal 32 is, for example, 10 ⁇ m or more and, for example, 200 ⁇ m or less.
- the interval between terminals 32 is, for example, 10 ⁇ m or more and, for example, 200 ⁇ m or less.
- the electronic component 40 is an example of the other object to be joined, and has a body portion 41 whose surface is resin-sealed and a plurality of terminals 42 electrically connected to the inside of the component.
- the terminal 42 is made of metal.
- the plurality of terminals 42 are separated from each other.
- the plurality of terminals 42 are arranged and sized to face the plurality of terminals 32 of the wiring board 30 .
- solder particles 11 and matrix resin 12 are illustrated.
- the wiring substrate 30, the joining sheet 10, and the electronic component 40 are laminated in this order (lamination step). Specifically, the wiring board 30 and the electronic component 40 are arranged with the corresponding terminals 32 , 42 facing each other, and the terminals 32 , 42 are embedded in the bonding sheet 10 . pressure. Thereby, the laminated body W is obtained. The wiring board 30 and the electronic component 40 are temporarily joined via the joining sheet 10 .
- the heating temperature is a temperature above the melting point of the solder particles 11 and the flux agent, a temperature above the softening point of the thermoplastic resin, and a temperature above the curing temperature of the thermosetting resin.
- the heating temperature is appropriately determined according to the type of thermosetting resin, thermoplastic resin, solder particles and flux agent, and is, for example, 120° C. or higher, preferably 130° C. or higher, and for example, 170° C. or lower. Yes, preferably 160° C. or less.
- the heating time is, for example, 3 seconds or more, and is, for example, 30 seconds or less, preferably 20 seconds or less.
- the thermoplastic resin is once melted in the joining sheet 10, and the flux agent is melted to exhibit the function of removing the oxide film on the surfaces of the solder particles.
- the solder particles melt and agglomerate, gather between the terminals 32 and 42 (self-alignment), and cure of the thermosetting resin progresses around the gathered solder.
- the solder material condensed between the terminals 32 and 42 is solidified to form the solder portion 11A.
- the wiring board 30 and the electronic component 40 are joined by the joining sheet 10, and the terminals 32 and 42 are electrically connected by the solder portion 11A.
- a cured resin portion 12A derived from the matrix resin 12 is formed around the solder portion 11A.
- the cured resin portion 12A contains at least partially cured thermosetting resin and solidified thermoplastic resin, and preferably contains the completely cured thermosetting resin and the solidified thermoplastic resin. .
- the electronic component 40 can be mounted on the wiring board 30 using the joining sheet 10 .
- the surface roughness Sa of the surface 10a of the joining sheet 10 is, as described above, 2.5 ⁇ m or less, preferably 1.5 ⁇ m or less, more preferably 1 ⁇ m or less, and even more preferably 0.7 ⁇ m or less.
- Such a configuration is suitable for ensuring the adhesive strength of the bonding sheet 10 when the adherends (wiring board 30, electronic component 40) are temporarily bonded (FIG. 3B), thus suppressing poor adhesion to the adherends.
- voids are more likely to be formed between the adherend and the bonding sheet 10 as the surface unevenness of the bonding sheet 10 increases. Formation of the voids is not preferable because it causes formation defects of the solder portion 11A and the cured resin portion 12A described above.
- the above configuration regarding the surface roughness Sa is suitable for suppressing the formation of voids between the adherend and the joining sheet 10 during temporary joining. Suppression of voids helps to suppress poor adhesion to the adherend.
- Example 1 A bonded sheet of Example 1 was produced as follows.
- an epoxy resin (trade name “jER828”, bisphenol A type epoxy resin, epoxy equivalent 184 to 194 g / eq, liquid at room temperature, manufactured by Mitsubishi Chemical Corporation) as a thermosetting resin, 70 parts by mass, and a thermoplastic resin 30 parts by mass of acrylic resin (trade name “ARUFON UH-2170”, hydroxyl group-containing styrene acrylic polymer, solid at room temperature, manufactured by Toagosei Co., Ltd.) and solder particles (42% by mass Sn-58% by mass Bi alloy, melting point 139 ° C.
- spherical shape, particle diameter D50 is 3 ⁇ m
- a flux agent solution were added to methyl ethyl ketone (MEK) and mixed to prepare a mixed composition having a solid content concentration of 70% by mass (second step).
- the content of the fluxing agent in this mixed composition was 50 parts by mass.
- composition of the joining sheet of Example 1 is shown in Table 1 (compositions of joining sheets of Examples and Comparative Examples below are also shown in Tables 1 and 2).
- Tables 1 and 2 the unit of each numerical value representing the composition of the composition is relative "parts by weight”.
- Example 2 In the second step, the bonding sheet of Example 2 was prepared in the same manner as the bonding sheet of Example 1, except that the amount of the fluxing agent (malic acid) in the mixed composition was changed from 50 parts by mass to 25 parts by mass. A bonded sheet was produced.
- the amount of the fluxing agent (malic acid) in the mixed composition was changed from 50 parts by mass to 25 parts by mass.
- Example 3 A bonded sheet of Example 3 was produced in the same manner as the bonded sheet of Example 1, except that the thickness of the bonded sheet was changed from 10 ⁇ m to 20 ⁇ m in the third step.
- Example 4 In the first step, malic acid as a fluxing agent is replaced by malonic acid, and in the second step, the same procedure as in the joining sheet of Example 1 is performed, except that the content of the fluxing agent in the mixed composition is 25 parts by mass. Thus, a joint sheet of Example 4 was produced.
- Example 5 In the first step, malonic acid is used instead of malic acid as a fluxing agent. In the second step, the content of the fluxing agent in the mixed composition is 25 parts by mass. A bonded sheet of Example 5 was produced in the same manner as the bonded sheet of Example 1, except that the bonded sheet was formed.
- Example 6 In the first step, malonic acid is used instead of malic acid as a fluxing agent. In the second step, the content of the fluxing agent in the mixed composition is 10 parts by mass. A bonded sheet of Example 6 was produced in the same manner as the bonded sheet of Example 1, except that the bonded sheet was formed.
- Example 7 to 10 In the first step, malic acid as a fluxing agent is replaced with adipic acid, which is used as a powder without being dissolved in ethanol, and in the second step, epoxy resin as a thermosetting resin and After mixing the acrylic resin, the solder particles, and the flux agent solution, a predetermined amount of methyl ethyl ketone (MEK) shown in Table 2 is added and mixed to prepare a coating liquid (second step), and a mixed composition was 25 parts by mass, and in the third step, the joining sheet of Examples 7 to 10 was performed in the same manner as the joining sheet of Example 1, except that a joining sheet having a thickness of 20 ⁇ m was formed on the separator. A bonded sheet was produced.
- MEK methyl ethyl ketone
- Comparative Example 1 A bonded sheet of Comparative Example 1 was produced in the same manner as in Example 1 except for the following.
- adipic acid (particle size D50 : 4.5 ⁇ m) was used as the fluxing agent instead of malic acid, and the adipic acid was not dissolved in ethanol.
- Comparative Example 2 A bonded sheet of Comparative Example 2 was produced in the same manner as in Example 1 except for the following.
- adipic acid particle size D50 : 4.5 ⁇ m
- the blending amount of the fluxing agent in the mixed composition was changed from 50 parts by mass to 25 parts by mass.
- Comparative Example 3 A bonded sheet of Comparative Example 3 was produced in the same manner as in Example 1 except for the following.
- adipic acid particle size D50 : 4.5 ⁇ m
- the fluxing agent instead of malic acid, and the adipic acid did not dissolve in ethanol.
- the blending amount of the fluxing agent in the mixed composition was changed from 50 parts by mass to 25 parts by mass.
- the thickness of the joining sheet was changed from 10 ⁇ m to 20 ⁇ m.
- Reference Example 1 A bonded sheet of Reference Example 1 (thickness: 10 ⁇ m) was produced in the same manner as the bonded sheets of Examples 1, 2 and 4 and Comparative Examples 1 and 2, except that no fluxing agent was used. For each bonding sheet of Examples 1, 2, 4 and Comparative Examples 1, 2, the bonding sheet of Reference Example 1 corresponds to the same bonding sheet except that it does not contain a fluxing agent.
- Reference example 2 A bonded sheet of Reference Example 2 (thickness: 20 ⁇ m) was produced in the same manner as the bonded sheets of Examples 3 and 5 to 10 and Comparative Examples 3 and 4, except that no fluxing agent was used.
- the bonding sheet of Reference Example 2 corresponds to the same bonding sheet except that it does not contain a fluxing agent.
- ⁇ Surface roughness> The surface roughness of each bonded sheet of Examples 1 to 10, Comparative Examples 1 to 4, and Reference Examples 1 and 2 was measured. Specifically, first, a measurement sample having a size of 5 cm ⁇ 5 cm was cut out from the joining sheet with the separator. Next, the exposed surface of the bonding sheet in the measurement sample was photographed with a laser microscope (trade name “VK-1000” manufactured by Keyence Corporation). For photography, a 20x lens was used, and the measurement mode was confocal mode (ISO 25178-607). Then, the surface roughness Sa ( ⁇ m) of a predetermined area (300 ⁇ m ⁇ 300 ⁇ m) was calculated based on the photographed data. The values are shown in Tables 1 and 2.
- a test piece for measurement was created. Specifically, first, a double-sided adhesive tape (trade name: "No. 5000NS", manufactured by Nitto Denko) was attached to a polyester film (trade name: “Lumirror", thickness: 50 ⁇ m, manufactured by Toray Industries, Inc.). Next, a bonding sheet was attached to the double-sided adhesive tape to obtain a laminate. A hand roller of 2 kg was used for these lamination. After that, a test piece having a size of 2 cm ⁇ 2 cm was cut out from the laminate.
- a double-sided adhesive tape trade name: "No. 5000NS", manufactured by Nitto Denko
- a polyester film trade name: “Lumirror”, thickness: 50 ⁇ m, manufactured by Toray Industries, Inc.
- the tack (N) of the surface of the joint sheet in the test piece was measured with a tack tester (trade name "TAC1000", manufactured by Lesca).
- TAC1000 tack tester
- a probe made of SUS403 5 mm in diameter
- the pressing speed of the probe is 0.5 mm / second
- the pressing pressure is 0.5 N
- the pressing time is 1.5 seconds
- the peeling speed of the probe is 2 mm/sec.
- Tables 1 and 2 show the measurement results.
- the tack (T 2 ) of each of the bonded sheets (10 ⁇ m thick) of Examples 1, 2, 4 and Comparative Examples 1 and 2 with respect to the tack (T 1 ) of the bonded sheet (10 ⁇ m thick) of Reference Example 1 Change rate (first tack change rate) and the bonded sheets of Examples 3, 5 to 10 and Comparative Examples 3 and 4 with respect to the tack (T 3 ) of the bonded sheet (thickness 10 ⁇ m) of Reference Example 2
- Tables 1 and 2 also show the change rate (second tack change rate) of tack (T 4 ) of (thickness 20 ⁇ m).
- the first tack change rate is expressed as (T 2 -T 1 )/T 1 .
- the above-mentioned first tack change rate of each joint sheet of Examples 1, 2, 4 and Comparative Examples 1 and 2 is the tack change rate from the joint sheet of Reference Example 1, which is the same except that it does not contain a fluxing agent. be.
- the second tack change rate is represented by (T 4 ⁇ T 3 )/T 3 .
- the second tack change rate of each of the joint sheets of Examples 3 and 5 to 10 and Comparative Examples 3 and 4 is the tack change rate from the joint sheet of Reference Example 2, which is the same except that it does not contain a fluxing agent. be.
- the first tack change rate of each of the joined sheets of Examples 1, 2, and 4 and the second tack change rate of each of the joined sheets of Examples 3, 5 to 10 were -30% or more.
- the tack reduction caused by the presence of the fluxing agent was suppressed, and good adhesiveness was ensured.
- the first tack change rate of each of the joined sheets of Comparative Examples 1 and 2 and the second tack change rate of the joined sheets of Comparative Examples 3 and 4 were less than ⁇ 30%, and Comparative Examples 1 to 4 In the joint sheet of No. 2, the tack reduction due to the presence of the fluxing agent is not suppressed, and good adhesiveness is not ensured.
- the joining sheet of the present invention is suitably used, for example, in joining a terminal of a wired circuit board and a terminal of an electronic component, or joining terminals of two wired circuit boards.
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- Polymers & Plastics (AREA)
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- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Laminated Bodies (AREA)
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Abstract
Description
また、接合シート10におけるフラックス剤の含有量は、マトリックス樹脂100質量部に対して、例えば100質量部以下、好ましくは80質量部以下、より好ましくは60質量部以下、更に好ましくは50質量部未満である。また、接合シート10におけるフラックス剤の体積割合は、例えば100体積%以下、好ましくは80体積%以下、より好ましくは50体積%以下である。これら構成は、接合シート10の成形性の観点から好ましい。
着色剤としては、レーザーマーキングなどによる刻印性を確保する観点から、黒系着色剤が好ましい。黒系着色剤としては、例えば、カーボンブラック、酸化銅、二酸化マンガン、アニリンブラック、ペリレンブラック、チタンブラック、およびシアニンブラックが挙げられる。また、着色剤としては、紫外線等の放射線照射により着色する化合物が用いられてもよい。そのような化合物としては、例えばロイコ色素が挙げられる。これら着色剤は、単独で用いられてもよいし、二種類以上が併用されてもよい。接合シート10が着色剤を含有する場合、接合シート10における着色剤の含有割合は、例えば0.01質量%以上であり、また、例えば1質量%以下である。
配線基板30および電子部品40は、接合シート10を介して仮接合されている。
硬化樹脂部12Aは、少なくとも部分的に硬化が進行した熱硬化性樹脂と、固化した熱可塑性樹脂とを含み、好ましくは、完全硬化状態の熱硬化性樹脂と、固化した熱可塑性樹脂とを含む。
以下のようにして、実施例1の接合シートを作製した。
第2工程において、混合組成物中のフラックス剤(リンゴ酸)の配合量を50質量部に代えて25質量部としたこと以外は、実施例1の接合シートと同様にして、実施例2の接合シートを作製した。
第3工程において、接合シートの厚さを10μmに代えて20μmとしたこと以外は、実施例1の接合シートと同様にして、実施例3の接合シートを作製した。
第1工程において、フラックス剤としてのリンゴ酸を、マロン酸とし、第2工程において、混合組成物におけるフラックス剤の含有量は25質量部であること以外は、実施例1の接合シートと同様にして、実施例4の接合シートを作製した。
第1工程において、フラックス剤としてのリンゴ酸を、マロン酸とし、第2工程において、混合組成物におけるフラックス剤の含有量は25質量部とし、第3工程において、セパレータ上に、厚さ20μmの接合シートを形成した以外は、実施例1の接合シートと同様にして、実施例5の接合シートを作製した。
第1工程において、フラックス剤としてのリンゴ酸を、マロン酸とし、第2工程において、混合組成物におけるフラックス剤の含有量は10質量部とし、第3工程において、セパレータ上に、厚さ20μmの接合シートを形成した以外は、実施例1の接合シートと同様にして、実施例6の接合シートを作製した。
第1工程において、フラックス剤としてのリンゴ酸を、アジピン酸とし、エタノールに溶解させず、粉体のまま使用し、第2工程において、熱硬化性樹脂としてのエポキシ樹脂と、熱可塑性樹脂としてのアクリル樹脂と、ハンダ粒子と、フラックス剤溶液とを混合したのち、表2に記載の所定量のメチルエチルケトン(MEK)を加えて混合し、塗工液を調製し(第2工程)、混合組成物におけるフラックス剤の含有量は25質量部とし、第3工程において、セパレータ上に、厚さ20μmの接合シートを形成した以外は、実施例1の接合シートと同様にして、実施例7~10の接合シートを作製した。
次のこと以外は実施例1と同様にして、比較例1の接合シートを作製した。第1工程において、フラックス剤として、リンゴ酸の代わりにアジピン酸(粒子径D50は4.5μm)を用い、当該アジピン酸はエタノールに溶解しなかった。
次のこと以外は実施例1と同様にして、比較例2の接合シートを作製した。第1工程において、フラックス剤として、リンゴ酸の代わりにアジピン酸(粒子径D50は4.5μm)を用い、当該アジピン酸はエタノールに溶解しなかった。第2工程において、混合組成物中のフラックス剤の配合量を50質量部に代えて25質量部とした。
次のこと以外は実施例1と同様にして、比較例3の接合シートを作製した。第1工程において、フラックス剤として、リンゴ酸の代わりにアジピン酸(粒子径D50は4.5μm)を用い、当該アジピン酸はエタノールに溶解しなかった。第2工程において、混合組成物中のフラックス剤の配合量を50質量部に代えて25質量部とした。第3工程において、接合シートの厚さを10μmに代えて20μmとした。
第1工程において、フラックス剤としてのリンゴ酸を、アジピン酸とし、エタノールに溶解させず、粉体のまま使用し、第2工程において、熱硬化性樹脂としてのエポキシ樹脂と、熱可塑性樹脂としてのアクリル樹脂と、ハンダ粒子と、フラックス剤溶液とを混合したのち、表2に記載の所定量のメチルエチルケトン(MEK)を加えて混合し、塗工液を調製し(第2工程)、混合組成物におけるフラックス剤の含有量は25質量部とし、第3工程において、セパレータ上に、厚さ20μmの接合シートを形成した以外は、実施例1の接合シートと同様にして、比較例4の接合シートを作製した。
フラックス剤を用いないこと以外は、実施例1,2,4および比較例1,2の接合シートと同様にして、参考例1の接合シート(厚さ10μm)を作製した。実施例1,2,4および比較例1,2の各接合シートにとり、参考例1の接合シートは、フラックス剤を含有しないこと以外は同じ接合シートに相当する。
フラックス剤を用いないこと以外は、実施例3,5~10および比較例3,4の接合シートと同様にして、参考例2の接合シート(厚さ20μm)を作製した。実施例3,5~10および比較例3,4の各接合シートにとり、参考例2の接合シートは、フラックス剤を含有しないこと以外は同じ接合シートに相当する。
実施例1~10、比較例1~4、および参考例1,2の各接合シートの表面粗さを測定した。具体的には、まず、セパレータ付きの接合シートから、5cm×5cmのサイズの測定試料を切り出した。次に、測定試料における接合シートの露出表面を、レーザー顕微鏡(商品名「VK-1000」,キーエンス社製)によって撮影した。撮影では、20倍レンズを用い、測定モードをコンフォーカルモード(ISO 25178-607)とした。そして、撮影データに基づき、所定領域(300μm×300μm)の表面粗さSa(μm)を算出した。その値を表1および表2に示す。
実施例1~10、比較例1~4、および参考例1,2の各接合シートのタックを、次のようにして測定した。
10a 表面
H 厚さ方向
10A 塗膜
11 ハンダ粒子
11A ハンダ部
12 マトリックス樹脂
12A 硬化樹脂部
S1,S2 基材
30 配線基板
40 電子部品
Claims (4)
- マトリックス樹脂と、ハンダ粒子と、フラックス剤とを含有する接合シートであって、
表面粗さSaが2.5μm以下の表面を有する、接合シート。 - 前記フラックス剤が、25℃で固体のカルボン酸である、請求項1に記載の接合シート。
- 30μm以下の厚さを有する、請求項1または2に記載の接合シート。
- 前記フラックス剤を含有しないこと以外は同じ接合シートからのタック変化率が-30%以上である、請求項1から3のいずれか一つに記載の接合シート。
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CN202280019114.3A CN117044042A (zh) | 2021-03-09 | 2022-03-07 | 接合片材 |
KR1020237029775A KR20230153384A (ko) | 2021-03-09 | 2022-03-07 | 접합 시트 |
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