WO2020184201A1 - 電子装置の製造方法 - Google Patents
電子装置の製造方法 Download PDFInfo
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- WO2020184201A1 WO2020184201A1 PCT/JP2020/008092 JP2020008092W WO2020184201A1 WO 2020184201 A1 WO2020184201 A1 WO 2020184201A1 JP 2020008092 W JP2020008092 W JP 2020008092W WO 2020184201 A1 WO2020184201 A1 WO 2020184201A1
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- Prior art keywords
- resin layer
- adhesive resin
- adhesive
- electronic device
- manufacturing
- Prior art date
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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
- C09J125/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a method for manufacturing an electronic device.
- a fan-out type WLP has been developed as a technology capable of reducing the size and weight of an electronic device (for example, a semiconductor device).
- eWLB embedded Wafer Level Ball Grid Array
- a plurality of electronic components such as semiconductor chips are temporarily fixed on an adhesive film attached to a support substrate in a separated state.
- a method of collectively sealing a plurality of electronic components with a sealing material is adopted.
- the adhesive film needs to be fixed to the electronic component and the support substrate in the sealing process and the like, and after sealing, it needs to be removed from the electronic component sealed together with the support substrate.
- Examples of the technique related to the method for manufacturing such a fan-out type WLP include those described in Patent Document 1 (Japanese Patent Laid-Open No. 2011-134811).
- Patent Document 1 describes a heat-resistant pressure-sensitive adhesive sheet for manufacturing a semiconductor device, which is used by sticking a substrate-less semiconductor chip when sealing it with a resin.
- the adhesive layer has an adhesive force against SUS304 after bonding of 0.5 N / 20 mm or more, and is cured by the stimulus received until the completion of the resin sealing process, so that the adhesive force against the package is increased.
- a heat-resistant adhesive sheet for manufacturing a semiconductor device which is characterized by having a layer of 2.0 N / 20 mm or less, is described.
- the present inventors when an electronic component having an uneven structure such as a bump is placed on the adhesive film and the electronic component is sealed with a sealing material, the position of the electronic component shifts. It has been clarified that there are cases where the sealant (hereinafter, also referred to as misalignment of the electronic component) or the encapsulant penetrates between the adhesive film and the electronic component and a sealing failure occurs. ..
- the present invention has been made in view of the above circumstances, and provides a method for manufacturing an electronic device capable of suppressing misalignment of electronic components and sealing defects in a sealing process.
- the present inventors have made extensive studies to achieve the above problems. As a result, they have found that by using an adhesive film provided with a concavo-convex absorbent resin layer as the adhesive film, it is possible to suppress misalignment of electronic components and sealing defects in the sealing process, and completed the present invention.
- the following method for manufacturing an electronic device is provided.
- An electronic component that is attached to the adhesive resin layer (A) of the adhesive film and has an uneven structure and A preparatory step for preparing a structure including a support substrate attached to the adhesive resin layer (B) of the adhesive film, and The sealing process of sealing the above electronic components with a sealing material, and A method of manufacturing an electronic device that includes at least.
- a method for manufacturing an electronic device according to the above [1] A method for manufacturing an electronic device in which the uneven absorption resin layer (C) is provided at least between the base material layer and the adhesive resin layer (A).
- the uneven structure of the electronic component is a method for manufacturing an electronic device including a bump electrode.
- a method for manufacturing an electronic device further comprising a first peeling step of reducing the adhesive force of the adhesive resin layer (B) by applying an external stimulus after the sealing step to peel the support substrate from the structure. .. [8] In the method for manufacturing an electronic device according to the above [7], A method for manufacturing an electronic device, further comprising a second peeling step of peeling the adhesive film from the electronic component after the first peeling step. [9] In the method for manufacturing an electronic device according to any one of the above [1] to [8]. A method for manufacturing an electronic device in which the sealing material is an epoxy resin-based sealing material.
- the adhesive resin constituting the adhesive resin layer (A) is selected from (meth) acrylic adhesive resin, silicone adhesive resin, urethane adhesive resin, olefin adhesive resin and styrene adhesive resin.
- a method for manufacturing an electronic device including one type or two or more types.
- FIG. 1 is a cross-sectional view schematically showing an example of the structure of the adhesive film 50 according to the embodiment of the present invention.
- 2 and 3 are cross-sectional views schematically showing an example of a method for manufacturing an electronic device according to an embodiment of the present invention.
- the method for manufacturing an electronic device according to the present embodiment includes at least the following two steps. (1) The base material layer 10, the adhesive resin layer (A) provided on the first surface 10A side of the base material layer 10 and for temporarily fixing the electronic component 70, and the second base material layer 10.
- An adhesive resin layer (B) provided on the surface 10B side and whose adhesive strength is reduced by an external stimulus, and between the base material layer 10 and the adhesive resin layer (A) or between the base material layer 10 and the adhesive resin.
- Preparation step for preparing the structure 100 including the electronic component 70 having the 75 and the support substrate 80 attached to the adhesive resin layer (B) of the adhesive film 50 (2) The electronic component by the sealing material 60 Sealing step to seal 70
- the uneven structure is provided by providing the uneven absorbing resin layer (C) between the base layer 10 and the adhesive resin layer (A) or between the base layer 10 and the adhesive resin layer (B).
- the adhesion between the electronic component having the above and the adhesive film is improved, and the misalignment of the electronic component and the occurrence of sealing failure in the sealing process can be suppressed.
- the adhesive film 50 having the unevenness absorbing resin layer (C) is used as the adhesive film for temporarily fixing the electronic component 70 having the unevenness structure 75.
- the adhesive film 50 By using the adhesive film 50, the adhesion of the adhesive film 50 to the electronic component 70 having the uneven structure 75 is improved. Therefore, in the step of sealing the electronic component, the position of the electronic component 70 is moved by the pressure due to the flow of the sealing material 60 or the like. It is possible to prevent the adhesive film from being displaced and the sealing material from entering between the adhesive film and the electronic component.
- the adhesive film 50 In the preparatory step, the adhesive film 50, the electronic component 70 which is attached to the adhesive resin layer (A) of the adhesive film 50 and has the uneven structure 75, and the adhesive resin layer (B) of the adhesive film 50. ), And the structure 100 including the support substrate 80 attached to the above.
- Such a structure 100 can be produced, for example, by the following procedure.
- the adhesive film 50 is attached onto the support substrate 80 so that the adhesive resin layer (B) is on the support substrate 80 side.
- a protective film called a separator may be attached on the adhesive resin layer (B), and the protective film may be peeled off and the exposed surface of the adhesive resin layer (B) may be attached to the surface of the support substrate 80.
- the support substrate 80 for example, a quartz substrate, a glass substrate, a SUS substrate, or the like can be used.
- the structure 100 can be obtained by arranging the electronic component 70 on the adhesive resin layer (A) of the adhesive film 50 attached on the support substrate 80.
- the electronic component 70 include semiconductor chips such as ICs, LSIs, discretes, light emitting diodes, and light receiving elements, semiconductor panels, and semiconductor packages.
- the surface of the electronic component 70 has an uneven structure 75, for example, by having electrodes. Further, for example, when an electronic device is mounted on a mounting surface, the electrodes are joined to the electrodes formed on the mounting surface, and electricity is supplied between the electronic device and the mounting surface (mounting surface such as a printed substrate). It forms a target connection.
- the electrode examples include bump electrodes such as ball bumps, printing bumps, stud bumps, plating bumps, and pillar bumps. That is, the electrode is usually a convex electrode. These bump electrodes may be used alone or in combination of two or more.
- the metal type constituting the bump electrode is not particularly limited, and examples thereof include silver, gold, copper, tin, lead, bismuth, and alloys thereof. These metal species may be used alone or in combination of two or more.
- the sealing material 60 is sealed with the sealing material 60.
- the electronic component 70 is covered with the sealing material 60, and the sealing material 60 is cured at a temperature of, for example, 150 ° C. or lower to seal the electronic component 70.
- the form of the sealing material 60 is not particularly limited, but is, for example, granular, sheet-like, or liquid.
- the sealing material 60 is not particularly limited, and for example, an epoxy resin-based sealing material using an epoxy resin can be used.
- a liquid epoxy resin-based encapsulant is preferable because the affinity of the encapsulant 60 with the adhesive film 50 becomes better and the electronic component 70 can be encapsulated even more evenly. ..
- an epoxy resin-based encapsulant for example, T693 / R4000 series, T693 / R1000 series, T693 / R5000 series, etc. manufactured by Nagase ChemteX Corporation can be used.
- sealing method examples include transfer molding, injection molding, compression molding, casting molding and the like.
- the sealing material 60 is cured by heating at a temperature of, for example, 150 ° C. or lower to obtain a structure 100 in which the electronic component 70 is sealed.
- ((3) First peeling step) In the method for manufacturing an electronic device according to the present embodiment, as shown in FIG. 3, after the (2) sealing step, an external stimulus is applied to reduce the adhesive force of the adhesive resin layer (B) to reduce the structure.
- a first peeling step of peeling the support substrate 80 from 100 may be further provided.
- the support substrate 80 can be easily removed from the adhesive film 50 by, for example, sealing the electronic component 70 and then heating it to a temperature exceeding 150 ° C. to reduce the adhesive force of the adhesive resin layer (B). can do.
- the method for manufacturing an electronic device according to the present embodiment further includes a second peeling step of peeling the adhesive film 50 from the electronic component 70 to obtain the electronic device 200 after the first peeling step.
- a second peeling step of peeling the adhesive film 50 from the electronic component 70 includes a method of mechanically peeling, a method of reducing the adhesive force on the surface of the adhesive film 50, and then peeling.
- the step (5) of forming the wiring layer 310 and the bump 320 on the exposed surface of the obtained electronic device 200 to obtain the electronic device 300 is performed. You may also prepare for it.
- the wiring layer 310 includes a pad (not shown) that is an external connection terminal formed on the outermost surface, and a wiring (not shown) that electrically connects the exposed electronic component 70 and the pad.
- the wiring layer 310 can be formed by a conventionally known method, and may have a multi-layer structure.
- the bump 320 can be formed on the pad of the wiring layer 310 to obtain the electronic device 300.
- the bump 320 include solder bumps and gold bumps.
- Solder bumps can be formed, for example, by arranging solder balls on pads that are external connection terminals of the wiring layer 310 and heating them to melt (reflow) the solder.
- the gold bump can be formed by a method such as a ball bonding method, a plating method, or an Au ball transfer method.
- a step (6) of dicing the electronic device 300 to obtain a plurality of electronic devices 400 may be further provided. Dicing of the electronic device 300 can be performed by a known method.
- FIG. 1 is a cross-sectional view schematically showing an example of the structure of the adhesive film 50 according to the embodiment of the present invention.
- the adhesive film 50 is provided on the base material layer 10 and the first surface 10A side of the base material layer 10, and is adhesive for temporarily fixing the electronic component 70.
- a concave-convex absorbent resin layer (C) provided between (A) or between the base material layer 10 and the adhesive resin layer (B) is provided.
- the unevenness absorbing resin layer (C) is preferably located at least between the base material layer 10 and the adhesive resin layer (A) from the viewpoint of further improving the unevenness absorbing property of the adhesive film 50.
- the unevenness-absorbing resin layer (C) When the unevenness-absorbing resin layer (C) is located between the base material layer 10 and the adhesive resin layer (A), yet another unevenness absorption between the adhesive resin layer (B) and the base material layer 10
- the sex resin layer (C') may be provided, and in this case, the unevenness-absorbing resin layer (C) and the unevenness-absorbing resin layer (C') may be the same or different in material, thickness, and the like.
- the thickness of the entire adhesive film 50 according to the present embodiment is preferably 10 ⁇ m or more and 1000 ⁇ m or less, and more preferably 20 ⁇ m or more and 500 ⁇ m or less, from the viewpoint of the balance between mechanical properties and handleability.
- the base material layer 10 is a layer provided for the purpose of improving the handleability, mechanical properties, heat resistance, and other properties of the adhesive film 50.
- the base material layer 10 is not particularly limited, and examples thereof include a resin film.
- a resin film As the resin constituting the resin film, a known thermoplastic resin can be used.
- polyolefins such as polyethylene, polypropylene, poly (4-methyl-1-pentene), poly (1-butene); polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate; nylon-6, nylon-66, poly.
- Polyesters such as metaxylene adipamide; polyacrylates; polymethacrylates; polyvinyl chlorides; polyvinylidene chlorides; polyimides; polyetherimides; ethylene / vinyl acetate copolymers; polyacrylonitrile; polycarbonates; polystyrenes; ionomers; polysulfones; poly Ether sulfone; one or more selected from polyphenylene ether and the like can be mentioned.
- polypropylene polyethylene terephthalate, polyethylene naphthalate, polyamide, and polyimide are preferable, and polyethylene terephthalate and polyethylene naphthalate are preferable from the viewpoint of excellent balance of transparency, mechanical strength, price, and the like. At least one selected from is more preferred.
- the base material layer 10 may be a single layer or two or more types of layers. Further, the form of the resin film used for forming the base material layer 10 may be a stretched film or a film stretched in the uniaxial direction or the biaxial direction, but the base material layer 10 may be used. From the viewpoint of improving the mechanical strength of the film, the film is preferably stretched in the uniaxial direction or the biaxial direction.
- the thickness of the base material layer 10 is preferably 1 ⁇ m or more and 500 ⁇ m or less, more preferably 5 ⁇ m or more and 300 ⁇ m or less, and further preferably 10 ⁇ m or more and 250 ⁇ m or less from the viewpoint of obtaining good film characteristics.
- the base material layer 10 may be surface-treated in order to improve the adhesiveness with other layers. Specifically, corona treatment, plasma treatment, undercoat treatment, primer coating treatment and the like may be performed.
- the adhesive resin layer (A) is a layer provided on one surface side of the base material layer 10. For example, when an electronic component is sealed with a sealing material in a manufacturing process of an electronic device, the surface of the electronic component is used. It is a layer for temporarily fixing electronic components in contact with.
- the adhesive resin layer (A) contains an adhesive resin (A1).
- the adhesive resin (A1) include (meth) acrylic adhesive resin (a), silicone adhesive resin, urethane adhesive resin, olefin adhesive resin, styrene adhesive resin and the like. .. Among these, the (meth) acrylic adhesive resin (a) is preferable from the viewpoint of facilitating the adjustment of the adhesive strength.
- the adhesive resin layer (A) a radiation-crosslinked adhesive resin layer whose adhesive strength is reduced by radiation can also be used. Since the radiation-crosslinked adhesive resin layer is crosslinked by irradiation with radiation and the adhesive force is significantly reduced, the adhesive film 50 can be easily peeled off from the electronic component. Examples of radiation include ultraviolet rays, electron beams, and infrared rays. As the radiation-crosslinked adhesive resin layer, an ultraviolet-crosslinked adhesive resin layer is preferable.
- the (meth) acrylic adhesive resin (a) used for the adhesive resin layer (A) has, for example, a (meth) acrylic acid alkyl ester monomer unit (a1) and a functional group capable of reacting with a cross-linking agent. Examples thereof include a copolymer containing a monomer unit (a2).
- the (meth) acrylic acid alkyl ester means an acrylic acid alkyl ester, a methacrylic acid alkyl ester, or a mixture thereof.
- the (meth) acrylic adhesive resin (a) is, for example, a monomer mixture containing a (meth) acrylic acid alkyl ester monomer (a1) and a monomer (a2) having a functional group capable of reacting with a cross-linking agent. Can be obtained by copolymerizing.
- (Meta) Acrylic Acid Alkyl Ester examples include (meth) acrylic acid alkyl esters having an alkyl group having about 1 to 12 carbon atoms.
- a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms is preferable. Specific examples thereof include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, -2-ethylhexyl acrylate, and -2-ethylhexyl methacrylate. These may be used alone, or two or more kinds may be used.
- the content of the (meth) acrylic acid alkyl ester monomer unit (a1) is the total mass of the (meth) acrylic adhesive resin (a).
- the total unit is 100% by mass, it is preferably 10% by mass or more and 98.9% by mass or less, more preferably 50% by mass or more and 97% by mass or less, and 85% by mass or more and 95% by mass or less. Is more preferable.
- Examples of the monomer (a2) forming the monomer (a2) having a functional group capable of reacting with the cross-linking agent include acrylic acid, methacrylic acid, itaconic acid, mesaconic acid, citraconic acid, fumaric acid, maleic acid, and itaconic acid monoalkyl ester.
- Methaconic acid monoalkyl ester citraconic acid monoalkyl ester, fumaric acid monoalkyl ester, maleic acid monoalkyl ester, glycidyl acrylate, glycidyl methacrylate, -2-hydroxyethyl acrylate, -2-hydroxyethyl methacrylate, acrylamide , Methacrylic acid, itaconic-butylaminoethyl acrylate, itaconic-butylaminoethyl methacrylate and the like.
- the content of the monomer unit (a2) is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (a). It is preferably 1% by mass or more and 40% by mass or less, more preferably 1% by mass or more and 20% by mass or less, and further preferably 1% by mass or more and 10% by mass or less.
- the (meth) acrylic adhesive resin (a) according to the present embodiment is specified to have properties as a bifunctional monomer unit (a3) and a surfactant in addition to the monomer unit (a1) and the monomer unit (a2). (Hereinafter referred to as a polymerizable surfactant) unit may be further contained.
- the polymerizable surfactant has a property of copolymerizing with the monomer (a1), the monomer (a2) and the monomer (a3), and also has an action as an emulsifier in the case of emulsion polymerization.
- Examples of the monomer (a3) forming the bifunctional monomer unit (a3) include allyl methacrylate, allyl acrylate, divinylbenzene, vinyl methacrylate, vinyl acrylate, trimethylpropantri (meth) acrylate, and pentaerythritoltri (meth).
- PDP-200, PDP-400, ADP-200, ADP-400 tetramethylene glycol type
- ADT-250 trade name
- ADT-850 a mixed type thereof
- the content of the monomer unit (a3) is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (a).
- it is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, and 0.1% by mass or more and 20% by mass or less. Is more preferable, and 0.1% by mass or more and 5% by mass or less is particularly preferable.
- polymerizable surfactants include those in which a polymerizable 1-propenyl group is introduced into the benzene ring of polyoxyethylene nonylphenyl ether (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .; trade name: Aqualon RN-10).
- the content of the polymerizable surfactant is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (a).
- it is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, and 0.1% by mass or more and 20% by mass or less. Is more preferable, and 0.1% by mass or more and 5% by mass or less is particularly preferable.
- the (meth) acrylic adhesive resin (a) according to the present embodiment further contains a monomer unit formed of a monomer having a polymerizable double bond such as vinyl acetate, acrylonitrile, and styrene, if necessary. You may.
- Examples of the polymerization reaction mechanism of the (meth) acrylic adhesive resin (a) according to the present embodiment include radical polymerization, anionic polymerization, cationic polymerization and the like.
- radical polymerization Considering the production cost of the (meth) acrylic adhesive resin (a), the influence of the functional group of the monomer, the influence of ions on the surface of the electronic component, and the like, polymerization by radical polymerization is preferable.
- benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, 3,3,5-trimethylhexanoyl peroxide, di-2-ethylhexyl peroxy are used as radical polymerization initiators.
- Dicarbonate methylethylketone peroxide, t-butylperoxyphthalate, t-butylperoxybenzoate, di-t-butylperoxyacetate, t-butylperoxyisobutyrate, t-butylperoxy-2-hexanoate, t -Butylperoxy-2-ethylhexanoate, t-butylperoxy-3,5,5-trimethylhexanoate, acetylperoxide, isobutyryl peroxide, octanoyl peroxide, t-butyl peroxide, di -Organic peroxides such as t-amyl peroxide; Inorganic peroxides such as ammonium persulfate, potassium persulfate, sodium persulfate; 2,2'-azobisisobutyronitrile, 2,2'-azobis-2 Examples thereof include azo compounds such as -methylbutyronitrile and
- water-soluble inorganic peroxides such as ammonium persulfate, potassium persulfate, and sodium persulfate
- water-soluble 4,4'-azobis An azo compound having a carboxyl group in the molecule, such as -4-cyanovaleric acid, is preferable.
- azo compounds having a carboxyl group in the molecule such as ammonium persulfate and 4,4'-azobis-4-cyanovaleric acid are more preferable, and 4,4'-azobis An azo compound having a carboxyl group in the molecule, such as -4-cyanovaleric acid, is particularly preferable.
- the adhesive resin layer (A) preferably further contains a cross-linking agent (A2) having two or more cross-linking functional groups in one molecule, in addition to the adhesive resin (A1).
- the cross-linking agent (A2) having two or more cross-linking functional groups in one molecule is used to react with the functional groups of the adhesive resin (A1) to adjust the adhesive force and the cohesive force.
- cross-linking agent (A2) examples include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether, neopentyl glycol diglycidyl ether, and resorcin diglycidyl.
- Epoxy compounds such as ether; isocyanate compounds such as tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate 3 adduct of trimethyl propane, polyisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate; trimethyl propan-tri- ⁇ -aziridini Lupropionate, tetramethylolmethane-tri- ⁇ -aziridinyl propionate, N, N'-diphenylmethane-4,4'-bis (1-aziridinecarboxyamide), N, N'-hexamethylene-1 , 6-Bis (1-aziridine carboxylamide), N, N'-toluene-2,4-Bis (1-Aziridine carboxylamide), Trimethylol propan-tri- ⁇ - (2-methylaziridine) propionate and other aziridines Systems compounds; tetrafunctional epoxy compounds such as N, N
- the content of the cross-linking agent (A2) is usually preferably in a range such that the number of functional groups in the cross-linking agent (A2) does not exceed the number of functional groups in the adhesive resin (A1). However, when a new functional group is generated in the cross-linking reaction, or when the cross-linking reaction is slow, an excessive amount may be contained as necessary.
- the content of the cross-linking agent (A2) in the adhesive resin layer (A) is 100 parts by mass of the adhesive resin (A1) from the viewpoint of improving the balance between the heat resistance and the adhesive force of the adhesive resin layer (A). On the other hand, it is preferably 0.1 part by mass or more and 15 parts by mass or less.
- the adhesive resin layer (A) may contain additives such as a plasticizer and a tackifier resin as other components.
- additives such as a plasticizer and a tackifier resin as other components.
- various additives for radiation cross-linking may be contained.
- the total content of the adhesive resin (A1) and the cross-linking agent (A2) in the adhesive resin layer (A) is preferably 50% by mass when the total content of the adhesive resin layer (A) is 100% by mass. As mentioned above, it is more preferably 70% by mass or more, further preferably 90% by mass or more, and particularly preferably 95% by mass or more. As a result, it is possible to further suppress the adhesive residue on the electronic component side when the adhesive film is peeled from the electronic component.
- the thickness of the adhesive resin layer (A) is not particularly limited, but is preferably 1 ⁇ m or more and 100 ⁇ m or less, and more preferably 3 ⁇ m or more and 50 ⁇ m or less.
- the adhesive resin layer (A) can be formed, for example, by applying an adhesive on the base material layer 10 or the unevenness absorbing resin layer (C).
- the pressure-sensitive adhesive may be dissolved in a solvent and applied as a coating liquid, may be applied as an aqueous emulsion, or a liquid pressure-sensitive adhesive may be directly applied. Of these, a pressure-sensitive adhesive coating solution dissolved in an organic solvent is preferable.
- the organic solvent is not particularly limited, and may be appropriately selected from known ones in consideration of solubility and drying time.
- organic solvent examples include ester systems such as ethyl acetate and methyl acetate; ketone systems such as acetone and MEK; aromatic systems such as benzene, toluene and ethyl benzene; linear or cyclic aliphatic systems such as heptane, hexane and cyclohexane; isopropanol. , Butanol and the like can be exemplified. Ethyl acetate and toluene are preferable as the organic solvent. These solvents may be used alone or in combination of two or more.
- the pressure-sensitive adhesive coating liquid As a method for applying the pressure-sensitive adhesive coating liquid, conventionally known coating methods, for example, a roll coater method, a reverse roll coater method, a gravure roll method, a bar coat method, a comma coater method, a die coater method and the like can be adopted.
- the drying conditions of the applied pressure-sensitive adhesive are not particularly limited, but in general, it is preferable to dry the applied adhesive in a temperature range of 80 to 200 ° C. for 10 seconds to 10 minutes. More preferably, it is dried at 80 to 170 ° C. for 15 seconds to 5 minutes.
- the pressure-sensitive adhesive coating liquid may be heated at 40 to 80 ° C.
- the base material layer 10 and the adhesive resin layer (A) or the unevenness absorbing resin layer (C) may be formed by coextrusion molding, or the film-like base material layer 10 and the film-like adhesive resin may be formed.
- the layer (A) may be laminated to form the layer (A).
- the adhesive film 50 according to the present embodiment includes an adhesive resin layer (B) whose adhesive strength is reduced by an external stimulus on the second surface 10B side of the base material layer 10 opposite to the first surface 10A.
- the adhesive film 50 can be easily peeled off from the support substrate 80 by applying an external stimulus.
- examples of the adhesive resin layer (B) whose adhesive strength is reduced by an external stimulus include a thermosetting adhesive resin layer whose adhesive strength is reduced by heating and a radiation peeling type whose adhesive strength is reduced by radiation. Examples include the adhesive resin layer of. Among these, a heat-peeling type adhesive resin layer whose adhesive strength is reduced by heating is preferable.
- Examples of the heat-peeling type adhesive resin layer include a heat-expandable pressure-sensitive adhesive containing a gas-generating component, a heat-expandable pressure-sensitive adhesive containing heat-expandable microspheres that can expand and reduce the adhesive force, and a heat-based adhesive.
- Examples thereof include an adhesive resin layer composed of a heat-expandable adhesive or the like whose adhesive strength is reduced by a cross-linking reaction of the components.
- the heat-expandable pressure-sensitive adhesive used for the pressure-sensitive adhesive resin layer (B) is, for example, a pressure-sensitive adhesive whose adhesive strength is reduced or lost when heated at a temperature exceeding 150 ° C.
- a pressure-sensitive adhesive whose adhesive strength is reduced or lost when heated at a temperature exceeding 150 ° C.
- the adhesive strength is reduced or lost by heating at a temperature exceeding 150 ° C.
- the adhesive resin layer (B) side is attached to a stainless steel plate, and heat treatment is performed at 140 ° C. for 1 hour. Then, it can be evaluated by the peel strength from the stainless steel plate, which is measured after heating at a temperature exceeding 150 ° C. for 2 minutes.
- the specific heating temperature when heating at a temperature exceeding 150 ° C. is set to a temperature higher than the temperature at which the gas is generated and the temperature at which the thermally expandable microspheres thermally expand, and the generated gas and the thermally expandable microspheres are heated. It is appropriately set depending on the type of microsphere.
- the loss of adhesive strength means, for example, a case where the 180 ° peel strength measured under the conditions of 23 ° C. and a tensile speed of 300 mm / min is less than 0.5 N / 25 mm.
- gas generating component used in the heat-expandable pressure-sensitive adhesive for example, an azo compound, an azide compound, a Meldrum's acid derivative, or the like can be used.
- inorganic foaming agents such as ammonium carbonate, ammonium hydrogencarbonate, sodium hydrogencarbonate, ammonium nitrite, sodium hydroxide, and various hydrazides, and water; alkane salt fluorides such as trichloromonofluoromethane and dichloromonofluoromethane.
- Azo compounds such as azobisisobutyronitrile, azodicarboxylicamide, barium azodicarboxylate; paratoluenesulfonyl hydrazide, diphenylsulfone-3,3'-disulfonylhydrazide, 4,4'-oxybis (benzenesulfonyl) Hydrazide), hydrazine compounds such as allylbis (sulfonyl hydrazide); semicarbazide compounds such as p-toluylenesulfonyl semicarbazide, 4,4'-oxybis (benzenesulfonyl semicarbazide); 5-morpholyl-1,2,3,4- Triazole compounds such as thiatriazole; organic foaming agents such as N-nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, N, N'-dimethyl-N, N'-dinitrosoterephthal
- heat-expandable microspheres used in the heat-expandable pressure-sensitive adhesive for example, a microencapsulated foaming agent can be used.
- thermally expandable microspheres include microspheres in which a substance that easily gasifies and expands by heating, such as isobutane, propane, and pentane, is encapsulated in an elastic shell.
- the material constituting the shell include vinylidene chloride-acrylonitrile copolymer, polyvinyl alcohol, polyvinyl butyral, polymethylmethacrylate, polyacrylonitrile, polyvinylidene chloride, polysulfone and the like.
- the heat-expandable microspheres can be produced, for example, by a coacervation method, an interfacial polymerization method, or the like.
- the heat-expandable microspheres can be added to the adhesive resin.
- the content of at least one selected from the gas generating component and the heat-expandable microspheres may be appropriately set according to the expansion ratio of the heat-peeling type adhesive resin layer (B), the decrease in adhesive strength, and the like. It is possible, but is not particularly limited, but for example, with respect to 100 parts by mass of the adhesive resin (B1) in the heat-release type adhesive resin layer (B), for example, 1 part by mass or more and 150 parts by mass or less, preferably 10 parts by mass. It is 130 parts by mass or less, more preferably 12 parts by mass or more and 100 parts by mass or less. It is preferable to design so that the temperature at which the gas is generated and the temperature at which the thermally expandable microspheres thermally expand exceed 150 ° C.
- Examples of the adhesive resin (B1) constituting the heat-expandable pressure-sensitive adhesive include (meth) acrylic resin (b), urethane-based resin, silicone-based resin, polyolefin-based resin, polyester-based resin, polyamide-based resin, and fluorine. Examples thereof include based resins, styrene-diene block copolymer based resins, and the like. Among these, the (meth) acrylic resin (b) is preferable.
- the (meth) acrylic adhesive resin (b) used for the adhesive resin layer (B) has, for example, a (meth) acrylic acid alkyl ester monomer unit (b1) and a functional group capable of reacting with a cross-linking agent. Examples thereof include copolymers containing a monomer unit (b2).
- the (meth) acrylic acid alkyl ester means an acrylic acid alkyl ester, a methacrylic acid alkyl ester, or a mixture thereof.
- the (meth) acrylic adhesive resin (b) according to the present embodiment is, for example, a monomer mixture containing a (meth) acrylic acid alkyl ester monomer (b1) and a monomer (b2) having a functional group capable of reacting with a cross-linking agent. Can be obtained by copolymerizing.
- (Meta) Acrylic Acid Alkyl Ester examples of the monomer (b1) forming the monomer unit (b1) include (meth) acrylic acid alkyl esters having an alkyl group having about 1 to 12 carbon atoms.
- a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 8 carbon atoms is preferable. Specific examples thereof include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, -2-ethylhexyl acrylate, and -2-ethylhexyl methacrylate. These may be used alone, or two or more kinds may be used.
- the content of the (meth) acrylic acid alkyl ester monomer unit (b1) is the total mass of the (meth) acrylic adhesive resin (b).
- the total unit is 100% by mass, it is preferably 10% by mass or more and 98.9% by mass or less, more preferably 50% by mass or more and 97% by mass or less, and 85% by mass or more and 95% by mass or less. Is more preferable.
- Examples of the monomer (b2) forming the monomer (b2) having a functional group capable of reacting with the cross-linking agent include acrylic acid, methacrylic acid, itaconic acid, mesaconic acid, citraconic acid, fumaric acid, maleic acid, and itaconic acid monoalkyl ester.
- the content of the monomer unit (b2) is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (b). It is preferably 1% by mass or more and 40% by mass or less, more preferably 1% by mass or more and 20% by mass or less, and further preferably 1% by mass or more and 10% by mass or less.
- the (meth) acrylic adhesive resin (b) according to the present embodiment is specified to have properties as a bifunctional monomer unit (b3) and a surfactant in addition to the monomer unit (b1) and the monomer unit (b2). (Hereinafter referred to as a polymerizable surfactant) unit may be further contained.
- the polymerizable surfactant has a property of copolymerizing with the monomer (b1), the monomer (b2) and the monomer (b3), and also acts as an emulsifier in the case of emulsion polymerization.
- Examples of the monomer (b3) forming the bifunctional monomer unit (b3) include allyl methacrylate, allyl acrylate, divinylbenzene, vinyl methacrylate, vinyl acrylate, trimethylpropantri (meth) acrylate, and pentaerythritoltri (meth).
- PDP-200, PDP-400, ADP-200, ADP-400 tetramethylene glycol type
- ADT-250 trade name
- ADT-850 a mixed type thereof
- the content of the monomer unit (b3) is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (b).
- it is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, and 0.1% by mass or more and 20% by mass or less. Is more preferable, and 0.1% by mass or more and 5% by mass or less is particularly preferable.
- polymerizable surfactants include those in which a polymerizable 1-propenyl group is introduced into the benzene ring of polyoxyethylene nonylphenyl ether (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .; trade name: Aqualon RN-10).
- the content of the polymerizable surfactant is 100% by mass based on the total of all the monomer units in the (meth) acrylic adhesive resin (b).
- it is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, and 0.1% by mass or more and 20% by mass or less. Is more preferable, and 0.1% by mass or more and 5% by mass or less is particularly preferable.
- the (meth) acrylic adhesive resin (b) according to the present embodiment further contains a monomer unit formed of a monomer having a polymerizable double bond such as vinyl acetate, acrylonitrile, and styrene, if necessary. You may.
- Examples of the polymerization reaction mechanism of the (meth) acrylic adhesive resin (b) according to the present embodiment include radical polymerization, anionic polymerization, cationic polymerization and the like.
- radical polymerization Considering the production cost of the (meth) acrylic adhesive resin (b), the influence of the functional group of the monomer, the influence of ions on the surface of the electronic component, and the like, polymerization by radical polymerization is preferable.
- benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, 3,3,5-trimethylhexanoyl peroxide, di-2-ethylhexyl peroxy are used as radical polymerization initiators.
- Dicarbonate methylethylketone peroxide, t-butylperoxyphthalate, t-butylperoxybenzoate, di-t-butylperoxyacetate, t-butylperoxyisobutyrate, t-butylperoxy-2-hexanoate, t -Butylperoxy-2-ethylhexanoate, t-butylperoxy-3,5,5-trimethylhexanoate, acetylperoxide, isobutyryl peroxide, octanoyl peroxide, t-butyl peroxide, di -Organic peroxides such as t-amyl peroxide; Inorganic peroxides such as ammonium persulfate, potassium persulfate, sodium persulfate; 2,2'-azobisisobutyronitrile, 2,2'-azobis-2 Examples thereof include azo compounds such as -methylbutyronitrile and
- water-soluble inorganic peroxides such as ammonium persulfate, potassium persulfate, and sodium persulfate
- water-soluble 4,4'-azobis An azo compound having a carboxyl group in the molecule, such as -4-cyanovaleric acid, is preferable.
- azo compounds having a carboxyl group in the molecule such as ammonium persulfate and 4,4'-azobis-4-cyanovaleric acid are more preferable, and 4,4'-azobis An azo compound having a carboxyl group in the molecule, such as -4-cyanovaleric acid, is particularly preferable.
- the adhesive resin layer (B) preferably further contains a cross-linking agent (B2) having two or more cross-linking functional groups in one molecule, in addition to the adhesive resin (B1).
- the cross-linking agent (B2) having two or more cross-linking functional groups in one molecule is used to react with the functional groups of the adhesive resin (B1) to adjust the adhesive force and the cohesive force.
- cross-linking agent (B2) examples include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether, neopentyl glycol diglycidyl ether, and resorcin diglycidyl.
- Epoxy compounds such as ether; isocyanate compounds such as tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate 3 adduct of trimethyl propane, polyisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate; trimethyl propan-tri- ⁇ -aziridini Lupropionate, tetramethylolmethane-tri- ⁇ -aziridinyl propionate, N, N'-diphenylmethane-4,4'-bis (1-aziridinecarboxyamide), N, N'-hexamethylene-1 , 6-Bis (1-aziridine carboxylamide), N, N'-toluene-2,4-Bis (1-Aziridine carboxylamide), Trimethylol propan-tri- ⁇ - (2-methylaziridine) propionate and other aziridines Systems compounds; tetrafunctional epoxy compounds such as N, N
- the content of the cross-linking agent (B2) is usually preferably in a range in which the number of functional groups in the cross-linking agent (B2) does not exceed the number of functional groups in the adhesive resin (B1). However, when a new functional group is generated in the cross-linking reaction, or when the cross-linking reaction is slow, an excessive amount may be contained as necessary.
- the content of the cross-linking agent (B2) in the adhesive resin layer (B) is preferably 0.1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the adhesive resin (B1), and is 0.5. It is more preferable that the amount is 5 parts by mass or more and 5 parts by mass or less.
- the adhesive resin layer (B) according to the present embodiment preferably contains a tackifier resin in addition to the adhesive resin (B1) from the viewpoint of improving the adhesion to the support substrate. It is preferable to include the tackifier resin in the tacky resin layer (B) because it is easy to adjust the adhesion to the support substrate near room temperature.
- the tackifier resin preferably has a softening point of 100 ° C. or higher.
- the tackifier resin include rosin-based resins such as rosin-based derivatives that have been subjected to esterification and the like; terpene-based resins such as ⁇ -pinene, ⁇ -pinene, dipentene, and terpenephenol; gum-based, Natural rosins such as wood-based and tall oil-based rosins; hydrogenation, disproportionation, polymerization, maleinization, petroleum resin; kumaron-indene resin and the like can be mentioned as these natural rosins.
- rosin-based resins such as rosin-based derivatives that have been subjected to esterification and the like
- terpene-based resins such as ⁇ -pinene, ⁇ -pinene, dipentene, and terpenephenol
- gum-based Natural rosins such as wood-based and tall oil-based rosins; hydrogenation, disproportionation, polymerization, maleinization, petroleum resin; kumar
- those having a softening point in the range of 100 to 160 ° C. are more preferable, and those having a softening point in the range of 120 to 150 ° C. are particularly preferable.
- the tackifier resin having a softening point within the above range is used, not only the contamination and adhesive residue on the support substrate are small, but also the adhesion to the support substrate in a working environment can be further improved.
- a polymerized rosin ester-based tackifier resin is used as the tackifier resin, not only is there less contamination and adhesive residue on the support substrate, but also the adhesiveness with the support substrate in an environment of 80 to 130 ° C. is improved.
- the heat-expandable microspheres can be more easily peeled off from the support substrate after expansion.
- the blending ratio of the tackifier resin may be appropriately selected so that the elastic modulus of the tacky resin layer (B) can be adjusted within a desired predetermined numerical range, and is not particularly limited. However, from the viewpoint of the elastic modulus of the adhesive resin layer (B) and the initial peeling force, it is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the adhesive resin (B1).
- the blending ratio of the tackifier resin is not more than the above lower limit value with respect to 100 parts by mass of the tacky resin (B1), the adhesion to the support substrate during work tends to be good.
- the stickability with the support substrate at room temperature tends to be good.
- the blending ratio of the tackifier resin is 2 to 50 parts by mass with respect to 100 parts by mass of the tacky resin (B1).
- the acid value of the tackifier resin is preferably 30 or less. When the acid value of the tackifier resin is not more than the above upper limit value, adhesive residue tends to be less likely to occur on the support substrate at the time of peeling.
- the adhesive resin layer (B) may contain an additive such as a plasticizer as another component.
- the total content of the adhesive resin (B1), the cross-linking agent (B2) and the tackifier resin in the adhesive resin layer (B) is preferably 100% by mass when the entire adhesive resin layer (B) is 100% by mass. It is 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass or more. Further, when the adhesive resin layer (B) is composed of a heat-expandable adhesive, the adhesive resin (B1), the cross-linking agent (B2), the tackifier resin, and gas generation in the adhesive resin layer (B) are generated.
- the total content of the components and the thermosetting microspheres is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 70% by mass or more, when the total content of the adhesive resin layer (B) is 100% by mass. It is 90% by mass or more, particularly preferably 95% by mass or more.
- the thickness of the adhesive resin layer (B) is not particularly limited, but is preferably 5 ⁇ m or more and 300 ⁇ m or less, and more preferably 20 ⁇ m or more and 150 ⁇ m or less.
- the adhesive resin layer (B) is, for example, a method of applying an adhesive coating liquid on the base material layer 10, a method of transferring the adhesive resin layer (B) formed on the separator onto the base material 10, and the like.
- a method for applying the pressure-sensitive adhesive coating liquid conventionally known coating methods, for example, a roll coater method, a reverse roll coater method, a gravure roll method, a bar coat method, a comma coater method, a die coater method and the like can be adopted.
- the drying conditions of the applied pressure-sensitive adhesive are not particularly limited, but in general, it is preferable to dry the applied adhesive in a temperature range of 80 to 200 ° C. for 10 seconds to 10 minutes.
- the pressure-sensitive adhesive coating liquid may be heated at 40 to 80 ° C. for about 5 to 300 hours after the drying is completed.
- the base material layer 10 and the adhesive resin layer (B) may be formed by coextrusion molding, or the film-like base material layer 10 and the film-like adhesive resin layer (B) are laminated. ) May be formed.
- the adhesive film 50 has an unevenness absorbing resin layer (C) between the base material layer 10 and the adhesive resin layer (A) or between the base material layer 10 and the adhesive resin layer (B). ).
- the unevenness-absorbing resin layer (C) improves the followability of the adhesive film 50 to the surface of the electronic component 70 on which the uneven structure 75 is formed, and adheres the uneven structure 75 of the electronic component 70 to the adhesive film 50. It is a layer provided for the purpose of improving the properties.
- the resin constituting the uneven absorption resin layer (C) is not particularly limited as long as it exhibits uneven absorption, but for example, a thermoplastic resin is preferable, and a polyolefin resin, a polystyrene resin, and a (meth) acrylic resin are used. One or more selected from the group consisting of resins is more preferable. Furthermore, a resin having a Shore D-type hardness of ASTM D-2240 by a D-type Shore is preferably 50 or less, more preferably 40 or less. Even if it is not a thermoplastic resin, it preferably has the same unevenness absorption as described above.
- thermoplastic resin according to the present embodiment is not particularly limited as long as it is a resin capable of forming the uneven absorption resin layer (C), and for example, ethylene / ⁇ - containing ethylene and ⁇ -olefin having 3 to 20 carbon atoms.
- Olefin copolymer high density ethylene resin, low density ethylene resin, medium density ethylene resin, ultra low density ethylene resin, linear low density polyethylene (LLDPE) resin, propylene (co) polymer, 1 -Buten (co) polymer, 4-methylpentene-1 (co) polymer, ethylene / cyclic olefin copolymer, ethylene / ⁇ -olefin / cyclic olefin copolymer, ethylene / ⁇ -olefin / non-conjugated polyene Olefin resins such as polymers, ethylene / ⁇ -olefin / conjugated polyene copolymers, ethylene / aromatic vinyl copolymers, ethylene / ⁇ -olefin / aromatic vinyl copolymers; ethylene / unsaturated anhydrous carboxylic acids Ethylene / anhydrous carboxylic acid-based copolymers such as polymers, ethylene / ⁇ -ole
- Density ethylene resin Density ethylene resin, ultra-low density ethylene resin, linear low density polyethylene (LLDPE) resin, ethylene / cyclic olefin copolymer, ethylene / ⁇ -olefin / cyclic olefin copolymer, ethylene / ⁇ -olefin / Non-conjugated polyene copolymers, ethylene / ⁇ -olefin / conjugated polyene copolymers, ethylene / aromatic vinyl copolymers, olefin resins such as ethylene / ⁇ -olefin / aromatic vinyl copolymers, ethylene / unsaturated Ethylene carboxylic acid copolymer, ethylene / ⁇ -olefin / unsaturated anhydrous carboxylic acid copolymer, ethylene / epoxy-containing unsaturated compound copolymer, ethylene / ⁇ -olefin / epoxy-containing unsaturated compound copolymer
- Ethylene / ⁇ -olefin copolymer composed of ethylene and ⁇ -olefin having 3 to 20 carbon atoms, low density ethylene resin, ultra low density ethylene resin, linear low density polyethylene (LLDPE) resin, ethylene / ⁇ -Olefin / non-conjugated polyene copolymer, ethylene / ⁇ -olefin / conjugated polyene copolymer, ethylene / unsaturated anhydrous carboxylic acid copolymer, ethylene / ⁇ -olefin / unsaturated anhydrous carboxylic acid copolymer, ethylene / Epoxy-containing unsaturated compound copolymer, ethylene / ⁇ -olefin / epoxy-containing unsaturated compound copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, etc.
- Ethylene / ⁇ -olefin copolymer composed of ethylene and ⁇ -olefin with 3 to 20 carbon atoms, low density ethylene resin, ultra low density ethylene resin, linear low density polyethylene (LLDPE) resin, ethylene / ⁇ -Ethylene such as olefin / non-conjugated polyene copolymer, ethylene / ⁇ -olefin / conjugated polyene copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, etc.
- LLDPE linear low density polyethylene
- one or more selected from unsaturated carboxylic acid copolymers are more preferable to use.
- at least one selected from an ethylene / ⁇ -olefin copolymer and an ethylene / vinyl acetate copolymer is particularly preferably used.
- the above-mentioned resins may be used alone or in a blended manner.
- the ⁇ -olefin of an ethylene / ⁇ -olefin copolymer composed of ethylene and an ⁇ -olefin having 3 to 20 carbon atoms used as the thermoplastic resin in the present embodiment is usually an ⁇ -olefin having 3 to 20 carbon atoms. Can be used alone or in combination of two or more. Of these, ⁇ -olefins having 10 or less carbon atoms are preferable, and ⁇ -olefins having 3 to 8 carbon atoms are particularly preferable.
- ⁇ -olefins examples include propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3,3-dimethyl-1-butene, and 4-methyl-1-pentene. , 1-octene, 1-decene, 1-dodecene and the like. Among these, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene and 1-octene are preferable because of their availability.
- the ethylene / ⁇ -olefin copolymer may be a random copolymer or a block copolymer, but a random copolymer is preferable from the viewpoint of flexibility.
- the thickness of the unevenness-absorbing resin layer (C) is not particularly limited as long as it can embed the unevenness structure 75 of the electronic component 70, but is preferably 10 ⁇ m or more and 1000 ⁇ m or less, preferably 20 ⁇ m or more. It is more preferably 900 ⁇ m or less, further preferably 30 ⁇ m or more and 800 ⁇ m or less, and particularly preferably 50 ⁇ m or more and 700 ⁇ m or less.
- the height of the bump electrode is H [ ⁇ m]
- the thickness of the concave-convex absorbing resin layer (C) is d [ ⁇ m].
- / D is preferably 1 or less, more preferably 0.85 or less, and even more preferably 0.7 or less.
- H / d is not more than the above upper limit value, the thickness of the adhesive film 50 can be made thinner and the unevenness absorption can be made better.
- the lower limit of H / d is not particularly limited, but is, for example, 0.01 or more.
- the height of the bump electrode is generally 2 ⁇ m or more and 600 ⁇ m or less.
- the height of the bump electrode is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, still more preferably 30 ⁇ m or more, the effect of the method for manufacturing the electronic device according to the present embodiment can be obtained even more effectively.
- the adhesive film 50 according to the present embodiment may be further provided with, for example, an easy-adhesion layer between the layers as long as the effects of the present embodiment are not impaired.
- Adhesive resin layer B Adhesive resin layer C Concavo-convex absorbent resin layer 10 Base material layer 10A First surface 10B Second surface 50 Adhesive film 60 Encapsulant 70 Electronic components 75 Concavo-convex structure 80 Support substrate 100 Structure 200 Electronics Device 300 Electronic device 310 Wiring layer 320 Bump 400 Electronic device
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Abstract
Description
ファンアウト型WLPの作製方法のひとつであるeWLB(Embedded Wafer Level Ball Grid Array)では、支持基板に貼り付けた粘着性フィルム上に、半導体チップ等の複数の電子部品を離間させた状態で仮固定し、封止材により複数の電子部品を一括封止する手法が取られる。ここで、粘着性フィルムは、封止工程等においては電子部品および支持基板に固着させる必要があり、封止後は支持基板とともに封止された電子部品から除去する必要がある。
本発明は上記事情に鑑みてなされたものであり、封止工程における電子部品の位置ずれや封止不良を抑制することが可能な電子装置の製造方法を提供するものである。
基材層と、上記基材層の第1面側に設けられ、かつ、電子部品を仮固定するための粘着性樹脂層(A)と、上記基材層の第2面側に設けられ、かつ、外部刺激により粘着力が低下する粘着性樹脂層(B)と、上記基材層と上記粘着性樹脂層(A)との間または上記基材層と上記粘着性樹脂層(B)との間に設けられた凹凸吸収性樹脂層(C)と、を備える粘着性フィルムと、
上記粘着性フィルムの上記粘着性樹脂層(A)に貼り付けられ、かつ、凹凸構造を有する電子部品と、
上記粘着性フィルムの上記粘着性樹脂層(B)に貼り付けられた支持基板と、を備える構造体を準備する準備工程と、
封止材により上記電子部品を封止する封止工程と、
を少なくとも備える電子装置の製造方法。
[2]
上記[1]に記載の電子装置の製造方法において、
上記凹凸吸収性樹脂層(C)が少なくとも前記基材層と前記粘着性樹脂層(A)との間に設けられている電子装置の製造方法。
[3]
上記[1]または[2]に記載の電子装置の製造方法において、
上記電子部品の上記凹凸構造はバンプ電極を含む電子装置の製造方法。
[4]
上記[3]に記載の電子装置の製造方法において、
上記バンプ電極の高さをH[μm]とし、上記凹凸吸収性樹脂層の厚みをd[μm]としたとき、H/dが0.01以上1以下である電子装置の製造方法。
[5]
上記[1]乃至[4]のいずれか一つに記載の電子装置の製造方法において、
上記凹凸吸収性樹脂層が熱可塑性樹脂を含む電子装置の製造方法。
[6]
上記[1]乃至[5]のいずれか一つに記載の電子装置の製造方法において、
上記凹凸吸収性樹脂層の厚みが10μm以上1000μm以下である電子装置の製造方法。
[7]
上記[1]乃至[6]のいずれか一つに記載の電子装置の製造方法において、
上記封止工程の後に、外部刺激を与えることにより上記粘着性樹脂層(B)の粘着力を低下させて上記構造体から上記支持基板を剥離する第1剥離工程をさらに備える電子装置の製造方法。
[8]
上記[7]に記載の電子装置の製造方法において、
上記第1剥離工程の後に、上記電子部品から上記粘着性フィルムを剥離する第2剥離工程をさらに備える電子装置の製造方法。
[9]
上記[1]乃至[8]のいずれか一つに記載の電子装置の製造方法において、
上記封止材がエポキシ樹脂系封止材である電子装置の製造方法。
[10]
上記[1]乃至[9]のいずれか一つに記載の電子装置の製造方法において、
上記粘着性樹脂層(A)を構成する粘着性樹脂が(メタ)アクリル系粘着性樹脂、シリコーン系粘着性樹脂、ウレタン系粘着性樹脂、オレフィン系粘着性樹脂およびスチレン系粘着性樹脂から選択される一種または二種以上を含む電子装置の製造方法。
はじめに、本実施形態に係る電子装置の製造方法について説明する。図1は、本発明に係る実施形態の粘着性フィルム50の構造の一例を模式的に示した断面図である。
図2および図3は、本発明に係る実施形態の電子装置の製造方法の一例を模式的に示した断面図である。
本実施形態に係る電子装置の製造方法は、以下の2つの工程を少なくとも備えている。
(1)基材層10と、基材層10の第1面10A側に設けられ、かつ、電子部品70を仮固定するための粘着性樹脂層(A)と、基材層10の第2面10B側に設けられ、かつ、外部刺激により粘着力が低下する粘着性樹脂層(B)と、基材層10と粘着性樹脂層(A)との間または基材層10と粘着性樹脂層(B)との間に設けられた凹凸吸収性樹脂層(C)と、を備える粘着性フィルム50と、粘着性フィルム50の粘着性樹脂層(A)に貼り付けられ、かつ、凹凸構造75を有する電子部品70と、粘着性フィルム50の粘着性樹脂層(B)に貼り付けられた支持基板80と、を備える構造体100を準備する準備工程
(2)封止材60により電子部品70を封止する封止工程
本発明者らは、上記課題を達成するために鋭意検討を重ねた。その結果、バンプのような凹凸構造を有する電子部品は、粘着性フィルムへの密着性が不十分となり、その結果、電子部品を封止する工程において、封止材の流動による圧力に耐え切れずに、電子部品の位置ずれが起きたり、粘着性フィルムと電子部品との間に封止材が侵入して封止不良が生じてしまったりすることを知見した。
本発明者らは、上記知見をもとにさらに検討を重ねた。その結果、基材層10と粘着性樹脂層(A)との間または基材層10と粘着性樹脂層(B)との間に凹凸吸収性樹脂層(C)を設けることによって、凹凸構造を有する電子部品と粘着性フィルムとの密着性が向上し、封止工程における電子部品の位置ずれや封止不良の発生を抑制できることを初めて見出した。
すなわち、本実施形態に係る電子装置の製造方法によれば、凹凸構造75を有する電子部品70を仮固定するための粘着性フィルムとして、凹凸吸収性樹脂層(C)を有する粘着性フィルム50を用いることで、凹凸構造75を有する電子部品70に対する粘着性フィルム50の密着性が向上するため、電子部品を封止する工程において、封止材60の流動による圧力等によって電子部品70の位置がずれてしまうことや、粘着性フィルムと電子部品との間に封止材が侵入してしまうことを抑制することができる。
以上のように、本実施形態に係る電子装置の製造方法によれば封止工程における電子部品の位置ずれや封止不良を抑制することが可能となる。
準備工程では、粘着性フィルム50と、粘着性フィルム50の粘着性樹脂層(A)に貼り付けられ、かつ、凹凸構造75を有する電子部品70と、粘着性フィルム50の粘着性樹脂層(B)に貼り付けられた支持基板80と、を備える構造体100を準備する。
まず、支持基板80上に、粘着性フィルム50を、粘着性樹脂層(B)が支持基板80側となるように貼着する。粘着性樹脂層(B)上にはセパレータと称する保護フィルムが貼付けられていてもよく、当該保護フィルムを剥がし、粘着性樹脂層(B)の露出面を支持基板80表面に貼着することができる。
支持基板80としては、例えば、石英基板、ガラス基板、SUS基板等を使用することができる。
電子部品70としては、例えば、IC、LSI、ディスクリート、発光ダイオード、受光素子等の半導体チップや半導体パネル、半導体パッケージ等を挙げることができる。
電子部品70の表面は、例えば、電極を有することにより、凹凸構造75となっている。
また、電極は、例えば、電子装置を実装面に実装する際に、実装面に形成された電極に対して接合されて、電子装置と実装面(プリント基板等の実装面)との間の電気的接続を形成するものである。
電極としては、例えば、ボールバンプ、印刷バンプ、スタッドバンプ、めっきバンプ、ピラーバンプ等のバンプ電極が挙げられる。すなわち、電極は、通常凸電極である。これらのバンプ電極は1種単独で用いてもよく2種以上を併用してもよい。
また、バンプ電極を構成する金属種は特に限定されず、例えば、銀、金、銅、錫、鉛、ビスマス及びこれらの合金等が挙げられる。これらの金属種は1種単独で用いてもよく2種以上を併用してもよい。
次いで、封止材60により電子部品70を封止する。
封止材60により電子部品70を覆い、例えば150℃以下の温度で封止材60を硬化させて、電子部品70を封止する。
また、封止材60の形態としては特に限定されないが、例えば、顆粒状、シート状または液状である。
特に、粘着性フィルム50への封止材60の親和性がより良好になり、電子部品70をより一層ムラなく封止することが可能となる点から、液状のエポキシ樹脂系封止材が好ましい。
このようなエポキシ樹脂系封止材としては、例えば、ナガセケムテックス社製のT693/R4000シリーズやT693/R1000シリーズ、T693/R5000シリーズ等を用いることができる。
本実施形態に係る電子装置の製造方法において、図3に示すように、(2)封止工程の後に、外部刺激を与えることにより粘着性樹脂層(B)の粘着力を低下させて構造体100から支持基板80を剥離する第1剥離工程をさらに備えてもよい。
支持基板80は、例えば、電子部品70を封止した後、150℃を超える温度に加熱して、粘着性樹脂層(B)の接着力を低下させることにより、粘着性フィルム50から容易に除去することができる。
本実施形態に係る電子装置の製造方法において、図3に示すように、第1剥離工程の後に、電子部品70から粘着性フィルム50を剥離し、電子装置200を得る第2剥離工程をさらに備えてもよい。
電子部品70から粘着性フィルム50を剥離する方法としては、例えば、機械的に剥離する方法や、粘着性フィルム50表面の粘着力を低下させてから剥離する方法等が挙げられる。
本実施形態に係る電子装置の製造方法において、図3に示すように、得られた電子装置200の露出面に、配線層310およびバンプ320を形成し、電子装置300を得る工程(5)をさらに備えてもよい。
電子装置300のダイシングは、公知の方法で行うことができる。
以下、本実施形態に係る粘着性フィルム50について説明する。
図1は、本発明に係る実施形態の粘着性フィルム50の構造の一例を模式的に示した断面図である。
凹凸吸収性樹脂層(C)は、粘着性フィルム50の凹凸吸収性をより一層良好にする観点から、少なくとも基材層10と粘着性樹脂層(A)との間に位置することが好ましい。
基材層10と粘着性樹脂層(A)との間に凹凸吸収性樹脂層(C)が位置する場合、粘着性樹脂層(B)と基材層10との間にさらに別の凹凸吸収性樹脂層(C’)を備えてもよく、この場合、凹凸吸収性樹脂層(C)と凹凸吸収性樹脂層(C’)は材質、厚み等が同様でもよく異なっていてもよい。
基材層10は、粘着性フィルム50の取り扱い性や機械的特性、耐熱性等の特性をより良好にすることを目的として設けられる層である。
基材層10は特に限定されないが、例えば、樹脂フィルムが挙げられる。
上記樹脂フィルムを構成する樹脂としては、公知の熱可塑性樹脂を用いることができる。例えば、ポリエチレン、ポリプロピレン、ポリ(4-メチル-1-ペンテン)、ポリ(1-ブテン)等のポリオレフィン;ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステル;ナイロン-6、ナイロン-66、ポリメタキシレンアジパミド等のポリアミド;ポリアクリレート;ポリメタアクリレート;ポリ塩化ビニル;ポリ塩化ビニリデン;ポリイミド;ポリエーテルイミド;エチレン・酢酸ビニル共重合体;ポリアクリロニトリル;ポリカーボネート;ポリスチレン;アイオノマー;ポリスルホン;ポリエーテルスルホン;ポリフェニレンエーテル等から選択される一種または二種以上を挙げることができる。
これらの中でも、透明性や機械的強度、価格等のバランスに優れる観点から、ポリプロピレン、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリアミド、ポリイミドから選択される一種または二種以上が好ましく、ポリエチレンテレフタレート、ポリエチレンナフタレートから選択される少なくとも一種がより好ましい。
また、基材層10を形成するために使用する樹脂フィルムの形態としては、延伸フィルムであってもよいし、一軸方向または二軸方向に延伸したフィルムであってもよいが、基材層10の機械的強度を向上させる観点から、一軸方向または二軸方向に延伸したフィルムであることが好ましい。
基材層10は、他の層との接着性を改良するために、表面処理を行ってもよい。具体的には、コロナ処理、プラズマ処理、アンダーコート処理、プライマーコート処理等を行ってもよい。
粘着性樹脂層(A)は、基材層10の一方の面側に設けられる層であり、例えば、電子装置の製造工程において封止材により電子部品を封止する際に、電子部品の表面に接触して電子部品を仮固定するための層である。
粘着性樹脂(A1)としては、例えば、(メタ)アクリル系粘着性樹脂(a)、シリコーン系粘着性樹脂、ウレタン系粘着性樹脂、オレフィン系粘着性樹脂、スチレン系粘着性樹脂等が挙げられる。
これらの中でも粘着力の調整を容易にする観点等から、(メタ)アクリル系粘着性樹脂(a)が好ましい。
放射線架橋型粘着性樹脂層としては、紫外線架橋型粘着性樹脂層が好ましい。
本実施形態において、(メタ)アクリル酸アルキルエステルとは、アクリル酸アルキルエステル、メタクリル酸アルキルエステル、またはこれらの混合物を意味する。
本実施形態に係る(メタ)アクリル系粘着性樹脂(a)において、(メタ)アクリル酸アルキルエステルモノマー単位(a1)の含有量は、(メタ)アクリル系粘着性樹脂(a)中の全モノマー単位の合計を100質量%としたとき、10質量%以上98.9質量%以下であることが好ましく、50質量%以上97質量%以下であることがより好ましく、85質量%以上95質量%以下であることがさらに好ましい。
本実施形態に係る(メタ)アクリル系粘着性樹脂(a)において、モノマー単位(a2)の含有量は、(メタ)アクリル系粘着性樹脂(a)中の全モノマー単位の合計を100質量%としたとき、1質量%以上40質量%以下であることが好ましく、1質量%以上20質量%以下であることがより好ましく、1質量%以上10質量%以下であることがさらに好ましい。
重合性界面活性剤は、モノマー(a1)、モノマー(a2)およびモノマー(a3)と共重合する性質を有すると共に、乳化重合する場合には乳化剤としての作用を有する。
本実施形態に係る(メタ)アクリル系粘着性樹脂(a)において、重合性界面活性剤の含有量は、(メタ)アクリル系粘着性樹脂(a)中の全モノマー単位の合計を100質量%としたとき、0.1質量%以上30質量%以下であることが好ましく、0.1質量%以上15質量%以下であることがより好ましく、0.1質量%以上20質量%以下であることがさらに好ましく、0.1質量%以上5質量%以下であることが特に好ましい。
ラジカル重合反応によって重合する際、ラジカル重合開始剤として、ベンゾイルパーオキサイド、ジ-t-ブチルパーオキサイド、ジクミルパーオキサイド、3,3,5-トリメチルヘキサノイルパーオキサイド、ジ-2-エチルヘキシルパーオキシジカーボネート、メチルエチルケトンパーオキサイド、t-ブチルパーオキシフタレート、t-ブチルパーオキシベンゾエート、ジ-t-ブチルパーオキシアセテート、t-ブチルパーオキシイソブチレート、t-ブチルパーオキシ-2-ヘキサノエート、t-ブチルパーオキシ-2-エチルヘキサノエート、t-ブチルパーオキシ-3,5,5-トリメチルヘキサノエート、アセチルパーオキサイド、イソブチリルパーオキサイド、オクタノイルパーオキサイド、t-ブチルパーオキサイド、ジ-t-アミルパーオキサイド等の有機過酸化物;過硫酸アンモニウム、過硫酸カリウム、過硫酸ナトリウム等の無機過酸化物;2,2'-アゾビスイソブチロニトリル、2,2'-アゾビス-2-メチルブチロニトリル、4,4'-アゾビス-4-シアノバレリックアシッド等のアゾ化合物が挙げられる。
架橋性の官能基を1分子中に2個以上有する架橋剤(A2)は、粘着性樹脂(A1)が有する官能基と反応させ、粘着力および凝集力を調整するために用いる。
このような架橋剤(A2)としては、ソルビトールポリグリシジルエーテル、ポリグリセロールポリグリシジルエーテル、ペンタエリスリトールポリグリシジルエーテル、ジグリセロールポリグリシジルエーテル、グリセロールポリグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、レソルシンジグリシジルエーテル等のエポキシ系化合物;テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート、トリメチロールプロパンのトルエンジイソシアネート3付加物、ポリイソシアネート、ジフェニルメタンジイソシアネート、トリレンジイソシアネート等のイソシアネート系化合物;トリメチロールプロパン-トリ-β-アジリジニルプロピオネート、テトラメチロールメタン-トリ-β-アジリジニルプロピオネート、N,N'-ジフェニルメタン-4,4'-ビス(1-アジリジンカルボキシアミド)、N,N'-ヘキサメチレン-1,6-ビス(1-アジリジンカルボキシアミド)、N,N'-トルエン-2,4-ビス(1-アジリジンカルボキシアミド)、トリメチロールプロパン-トリ-β-(2-メチルアジリジン)プロピオネート等のアジリジン系化合物;N,N,N',N'-テトラグリシジル-m-キシレンジアミン、1,3-ビス(N,N'-ジグリシジルアミノメチル)シクロヘキサン等の4官能性エポキシ系化合物;ヘキサメトキシメチロールメラミン等のメラミン系化合物等が挙げられる。これらは単独で使用してもよいし、2種以上を併用してもよい。
これらの中でも、エポキシ系化合物、イソシアネート系化合物およびアジリジン系化合物から選択される一種または二種以上を含むことが好ましい。
粘着性樹脂層(A)中の架橋剤(A2)の含有量は、粘着性樹脂層(A)の耐熱性や密着力とのバランスを向上させる観点から、粘着性樹脂(A1)100質量部に対し、0.1質量部以上15質量部以下であることが好ましい。
中でも有機溶剤に溶解した粘着剤塗布液が好ましい。有機溶剤は特に限定されず、溶解性や乾燥時間を鑑みて公知の中から適宜選択すればよい。有機溶剤としては、酢酸エチル、酢酸メチル等のエステル系;アセトン、MEK等のケトン系;ベンゼン、トルエン、エチルベンゼン等の芳香族系;ヘプタン、ヘキサン、シクロヘキサン等の直鎖ないし環状脂肪族系;イソプロパノール、ブタノール等のアルコール系を例示することができる。有機溶剤として酢酸エチル、トルエンが好ましい。これらの溶剤は、1種単独で用いてもよいし、2種以上を混合して用いてもよい。
粘着剤塗布液を塗布する方法としては、従来公知の塗布方法、例えば、ロールコーター法、リバースロールコーター法、グラビアロール法、バーコート法、コンマコーター法、ダイコーター法等が採用できる。塗布された粘着剤の乾燥条件には特に制限はないが、一般的には、80~200℃の温度範囲において、10秒~10分間乾燥することが好ましい。さらに好ましくは、80~170℃において、15秒~5分間乾燥する。架橋剤と粘着剤との架橋反応を十分に促進させるために、粘着剤塗布液の乾燥が終了した後、40~80℃において5~300時間程度加熱してもよい。
また、基材層10と粘着性樹脂層(A)や凹凸吸収性樹脂層(C)とは共押出成形によって形成してもよいし、フィルム状の基材層10とフィルム状の粘着性樹脂層(A)とをラミネート(積層)して形成してもよい。
本実施形態に係る粘着性フィルム50は、基材層10の第1面10Aとは反対側の第2面10B側に外部刺激により粘着力が低下する粘着性樹脂層(B)を備える。
これにより、外部刺激を与えることで支持基板80から粘着性フィルム50を容易に剥離することができる。
ここで、外部刺激により粘着力が低下する粘着性樹脂層(B)としては、例えば、加熱により粘着力が低下する加熱剥離型の粘着性樹脂層や、放射線により粘着力が低下する放射線剥離型の粘着性樹脂層等が挙げられる。これらの中でも加熱により粘着力が低下する加熱剥離型の粘着性樹脂層が好ましい。
加熱剥離型の粘着性樹脂層としては、例えば、気体発生成分を含む加熱膨張型粘着剤、膨張して粘着力を低減できる熱膨張性の微小球を含む加熱膨張型粘着剤、熱により接着剤成分が架橋反応することで接着力が低下する加熱膨張型粘着剤等により構成された粘着性樹脂層が挙げられる。
ここで、150℃を超える温度で加熱することで接着力が低下または喪失することは、例えば、粘着性樹脂層(B)側をステンレス板に貼り付け、140℃で1時間の加熱処理をおこない、次いで、150℃を超える温度で2分間加熱した後に測定される、ステンレス板からの剥離強度により評価することができる。150℃を超える温度で加熱する際の具体的な加熱温度は、気体が発生する温度や熱膨張性の微小球が熱膨張する温度よりも高い温度に設定され、発生する気体や熱膨張性の微小球の種類によって適宜設定される。本実施形態において、接着力が喪失するとは、例えば、23℃、引張速度300mm/分の条件で測定される180°剥離強度が0.5N/25mm未満になる場合をいう。
熱膨張性の微小球は粘着性樹脂に添加することができる。
気体が発生する温度や熱膨張性の微小球が熱膨張する温度が、150℃を超える温度になるように設計することが好ましい。
本実施形態において、(メタ)アクリル酸アルキルエステルとは、アクリル酸アルキルエステル、メタクリル酸アルキルエステル、またはこれらの混合物を意味する。
本実施形態に係る(メタ)アクリル系粘着性樹脂(b)において、(メタ)アクリル酸アルキルエステルモノマー単位(b1)の含有量は、(メタ)アクリル系粘着性樹脂(b)中の全モノマー単位の合計を100質量%としたとき、10質量%以上98.9質量%以下であることが好ましく、50質量%以上97質量%以下であることがより好ましく、85質量%以上95質量%以下であることがさらに好ましい。
本実施形態に係る(メタ)アクリル系粘着性樹脂(b)において、モノマー単位(b2)の含有量は、(メタ)アクリル系粘着性樹脂(b)中の全モノマー単位の合計を100質量%としたとき、1質量%以上40質量%以下であることが好ましく、1質量%以上20質量%以下であることがより好ましく、1質量%以上10質量%以下であることがさらに好ましい。
重合性界面活性剤は、モノマー(b1)、モノマー(b2)およびモノマー(b3)と共重合する性質を有すると共に、乳化重合する場合には乳化剤としての作用を有する。
本実施形態に係る(メタ)アクリル系粘着性樹脂(b)において、重合性界面活性剤の含有量は、(メタ)アクリル系粘着性樹脂(b)中の全モノマー単位の合計を100質量%としたとき、0.1質量%以上30質量%以下であることが好ましく、0.1質量%以上15質量%以下であることがより好ましく、0.1質量%以上20質量%以下であることがさらに好ましく、0.1質量%以上5質量%以下であることが特に好ましい。
ラジカル重合反応によって重合する際、ラジカル重合開始剤として、ベンゾイルパーオキサイド、ジ-t-ブチルパーオキサイド、ジクミルパーオキサイド、3,3,5-トリメチルヘキサノイルパーオキサイド、ジ-2-エチルヘキシルパーオキシジカーボネート、メチルエチルケトンパーオキサイド、t-ブチルパーオキシフタレート、t-ブチルパーオキシベンゾエート、ジ-t-ブチルパーオキシアセテート、t-ブチルパーオキシイソブチレート、t-ブチルパーオキシ-2-ヘキサノエート、t-ブチルパーオキシ-2-エチルヘキサノエート、t-ブチルパーオキシ-3,5,5-トリメチルヘキサノエート、アセチルパーオキサイド、イソブチリルパーオキサイド、オクタノイルパーオキサイド、t-ブチルパーオキサイド、ジ-t-アミルパーオキサイド等の有機過酸化物;過硫酸アンモニウム、過硫酸カリウム、過硫酸ナトリウム等の無機過酸化物;2,2'-アゾビスイソブチロニトリル、2,2'-アゾビス-2-メチルブチロニトリル、4,4'-アゾビス-4-シアノバレリックアシッド等のアゾ化合物が挙げられる。
架橋性の官能基を1分子中に2個以上有する架橋剤(B2)は、粘着性樹脂(B1)が有する官能基と反応させ、粘着力および凝集力を調整するために用いる。
このような架橋剤(B2)としては、ソルビトールポリグリシジルエーテル、ポリグリセロールポリグリシジルエーテル、ペンタエリスリトールポリグリシジルエーテル、ジグリセロールポリグリシジルエーテル、グリセロールポリグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、レソルシンジグリシジルエーテル等のエポキシ系化合物;テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート、トリメチロールプロパンのトルエンジイソシアネート3付加物、ポリイソシアネート、ジフェニルメタンジイソシアネート、トリレンジイソシアネート等のイソシアネート系化合物;トリメチロールプロパン-トリ-β-アジリジニルプロピオネート、テトラメチロールメタン-トリ-β-アジリジニルプロピオネート、N,N'-ジフェニルメタン-4,4'-ビス(1-アジリジンカルボキシアミド)、N,N'-ヘキサメチレン-1,6-ビス(1-アジリジンカルボキシアミド)、N,N'-トルエン-2,4-ビス(1-アジリジンカルボキシアミド)、トリメチロールプロパン-トリ-β-(2-メチルアジリジン)プロピオネート等のアジリジン系化合物;N,N,N',N'-テトラグリシジル-m-キシレンジアミン、1,3-ビス(N,N'-ジグリシジルアミノメチル)シクロヘキサン等の4官能性エポキシ系化合物;ヘキサメトキシメチロールメラミン等のメラミン系化合物等が挙げられる。これらは単独で使用してもよいし、2種以上を併用してもよい。
これらの中でも、エポキシ系化合物、イソシアネート系化合物およびアジリジン系化合物から選択される一種または二種以上を含むことが好ましい。
粘着性樹脂層(B)中の架橋剤(B2)の含有量は、粘着性樹脂(B1)100質量部に対し、0.1質量部以上10質量部以下であることが好ましく、0.5質量部以上5質量部以下であることがより好ましい。
粘着剤塗布液を塗布する方法としては、従来公知の塗布方法、例えば、ロールコーター法、リバースロールコーター法、グラビアロール法、バーコート法、コンマコーター法、ダイコーター法等が採用できる。塗布された粘着剤の乾燥条件には特に制限はないが、一般的には、80~200℃の温度範囲において、10秒~10分間乾燥することが好ましい。さらに好ましくは、80~170℃において、15秒~5分間乾燥する。架橋剤と粘着剤との架橋反応を十分に促進させるために、粘着剤塗布液の乾燥が終了した後、40~80℃において5~300時間程度加熱してもよい。
また、基材層10と粘着性樹脂層(B)とは共押出成形によって形成してもよいし、フィルム状の基材層10とフィルム状の粘着性樹脂層(B)とをラミネート(積層)して形成してもよい。
本実施形態に係る粘着性フィルム50は、基材層10と粘着性樹脂層(A)との間または基材層10と粘着性樹脂層(B)との間に凹凸吸収性樹脂層(C)を有する。
凹凸吸収性樹脂層(C)は、電子部品70の凹凸構造75が形成された面への粘着性フィルム50の追従性を良好にし、電子部品70の凹凸構造75と粘着性フィルム50との密着性を良好にすることを目的として設けられる層である。
熱可塑性樹脂でない場合でも上記と同等の凹凸吸収性を有することが好ましい。
エチレンおよび炭素数3~20のα-オレフィンからなるエチレン・α-オレフィン共重合体、低密度エチレン系樹脂、超低密度エチレン系樹脂、直鎖状低密度ポリエチレン(LLDPE)系樹脂、エチレン・α-オレフィン・非共役ポリエン共重合体、エチレン・α-オレフィン・共役ポリエン共重合体、エチレン・不飽和無水カルボン酸共重合体、エチレン・α-オレフィン・不飽和無水カルボン酸共重合体、エチレン・エポキシ含有不飽和化合物共重合体、エチレン・α-オレフィン・エポキシ含有不飽和化合物共重合体、エチレン・酢酸ビニル共重合体、エチレン・アクリル酸共重合体、エチレン・メタアクリル酸共重合体等のエチレン・不飽和カルボン酸共重合体から選択される一種または二種以上を用いることがより好ましい。
エチレンおよび炭素数3~20のα-オレフィンからなるエチレン・α-オレフィン共重合体、低密度エチレン系樹脂、超低密度エチレン系樹脂、直鎖状低密度ポリエチレン(LLDPE)系樹脂、エチレン・α-オレフィン・非共役ポリエン共重合体、エチレン・α-オレフィン・共役ポリエン共重合体、エチレン・酢酸ビニル共重合体、エチレン・アクリル酸共重合体、エチレン・メタアクリル酸共重合体等のエチレン・不飽和カルボン酸共重合体から選択される一種または二種以上を用いることがさらに好ましい。
これらの中でも、エチレン・α-オレフィン共重合体およびエチレン・酢酸ビニル共重合体から選択される少なくとも一種が特に好ましく使用される。なお本実施形態においては上述した樹脂は、単独で用いてもよいし、ブレンドして用いてもよい。
H/dの下限は特に限定されないが、例えば、0.01以上である。バンプ電極の高さは、一般的に2μm以上600μm以下である。
ここで、本発明者らの検討によれば、電子部品70の凹凸構造75の凹凸が大きいほど封止工程における電子部品の位置ずれや封止不良が起きやすいことが明らかになった。そのため、バンプ電極の高さが好ましくは10μm以上、より好ましくは20μm以上、さらに好ましくは30μm以上のとき、本実施形態に係る電子装置の製造方法の効果をより一層効果的に得ることができる。
本実施形態に係る粘着性フィルム50は、本実施形態の効果を損なわない範囲で、各層の間に、例えば、易接着層等がさらに設けられていてもよい。
B 粘着性樹脂層
C 凹凸吸収性樹脂層
10 基材層
10A 第1面
10B 第2面
50 粘着性フィルム
60 封止材
70 電子部品
75 凹凸構造
80 支持基板
100 構造体
200 電子装置
300 電子装置
310 配線層
320 バンプ
400 電子装置
Claims (10)
- 基材層と、前記基材層の第1面側に設けられ、かつ、電子部品を仮固定するための粘着性樹脂層(A)と、前記基材層の第2面側に設けられ、かつ、外部刺激により粘着力が低下する粘着性樹脂層(B)と、前記基材層と前記粘着性樹脂層(A)との間または前記基材層と前記粘着性樹脂層(B)との間に設けられた凹凸吸収性樹脂層(C)と、を備える粘着性フィルムと、
前記粘着性フィルムの前記粘着性樹脂層(A)に貼り付けられ、かつ、凹凸構造を有する電子部品と、
前記粘着性フィルムの前記粘着性樹脂層(B)に貼り付けられた支持基板と、を備える構造体を準備する準備工程と、
封止材により前記電子部品を封止する封止工程と、
を少なくとも備える電子装置の製造方法。 - 請求項1に記載の電子装置の製造方法において、
上記凹凸吸収性樹脂層(C)が少なくとも前記基材層と前記粘着性樹脂層(A)との間に設けられている電子装置の製造方法。 - 請求項1または2に記載の電子装置の製造方法において、
前記電子部品の前記凹凸構造はバンプ電極を含む電子装置の製造方法。 - 請求項3に記載の電子装置の製造方法において、
前記バンプ電極の高さをH[μm]とし、前記凹凸吸収性樹脂層の厚みをd[μm]としたとき、H/dが0.01以上1以下である電子装置の製造方法。 - 請求項1乃至4のいずれか一項に記載の電子装置の製造方法において、
前記凹凸吸収性樹脂層が熱可塑性樹脂を含む電子装置の製造方法。 - 請求項1乃至5のいずれか一項に記載の電子装置の製造方法において、
前記凹凸吸収性樹脂層の厚みが10μm以上1000μm以下である電子装置の製造方法。 - 請求項1乃至6のいずれか一項に記載の電子装置の製造方法において、
前記封止工程の後に、外部刺激を与えることにより前記粘着性樹脂層(B)の粘着力を低下させて前記構造体から前記支持基板を剥離する第1剥離工程をさらに備える電子装置の製造方法。 - 請求項7に記載の電子装置の製造方法において、
前記第1剥離工程の後に、前記電子部品から前記粘着性フィルムを剥離する第2剥離工程をさらに備える電子装置の製造方法。 - 請求項1乃至8のいずれか一項に記載の電子装置の製造方法において、
前記封止材がエポキシ樹脂系封止材である電子装置の製造方法。 - 請求項1乃至9のいずれか一項に記載の電子装置の製造方法において、
前記粘着性樹脂層(A)を構成する粘着性樹脂が(メタ)アクリル系粘着性樹脂、シリコーン系粘着性樹脂、ウレタン系粘着性樹脂、オレフィン系粘着性樹脂およびスチレン系粘着性樹脂から選択される一種または二種以上を含む電子装置の製造方法。
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