WO2019208378A1 - 粘着性フィルムおよび電子装置の製造方法 - Google Patents
粘着性フィルムおよび電子装置の製造方法 Download PDFInfo
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- WO2019208378A1 WO2019208378A1 PCT/JP2019/016599 JP2019016599W WO2019208378A1 WO 2019208378 A1 WO2019208378 A1 WO 2019208378A1 JP 2019016599 W JP2019016599 W JP 2019016599W WO 2019208378 A1 WO2019208378 A1 WO 2019208378A1
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- adhesive film
- electronic component
- resin layer
- ethylene
- absorbent resin
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
- H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
- H10P72/7402—Wafer tapes, e.g. grinding or dicing support tapes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/286—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysulphones; polysulfides
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- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
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- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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
- 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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
- C09J7/243—Ethylene or propylene 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
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- B32B2405/00—Adhesive articles, e.g. adhesive tapes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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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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- 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
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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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- C09J2431/00—Presence of polyvinyl acetate
- C09J2431/006—Presence of polyvinyl acetate in the substrate
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
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Definitions
- the present invention relates to an adhesive film and a method for manufacturing an electronic device.
- an adhesive film is attached to the circuit forming surface of the electronic components in order to fix the electronic components and prevent damage to the electronic components. It is done.
- an adhesive film a film in which an adhesive resin layer is laminated on a base film is generally used.
- an adhesive having an uneven absorbent resin layer provided between the base film and the adhesive resin layer in order to impart uneven absorbency to the adhesive film. Film is being considered.
- Patent Document 1 Japanese Patent Laid-Open No. 2014-11273
- Patent Document 2 Japanese Patent Laid-Open No. 2010-258426.
- Patent Document 1 has at least one low elastic modulus layer on one surface of a high elastic substrate film, a radiation curable pressure-sensitive adhesive layer on the low elastic modulus layer, and the high elastic substrate.
- the Young's modulus of the material film is 5.0 ⁇ 10 8 Pa to 1.1 ⁇ 10 10 Pa
- the storage elastic modulus G ′ (25 ° C.) at 25 ° C. of the low elastic modulus layer is 2.5 ⁇ 10 5.
- the ratio tan ⁇ (60 ° C.) / Tan ⁇ (25 ° C.) with respect to the tangent tan ⁇ (60 ° C.) is 4.0 or more, and the thickness of the radiation curable pressure-sensitive adhesive layer is 5 to 100 ⁇ m.
- the ratio of the thickness of the low elastic modulus layer to the radiation curable pressure-sensitive adhesive layer, the thickness of the radiation curable pressure-sensitive adhesive layer / the thickness of the low elastic modulus layer is 1/2 or less.
- Patent Document 2 discloses a method for laminating a semiconductor wafer protective adhesive sheet obtained by laminating a base material, at least one intermediate layer and an adhesive layer in this order on the surface of the semiconductor wafer, For semiconductor wafer protection, characterized in that the bonding temperature of the semiconductor wafer is 50 ° C. to 100 ° C., and the loss tangent (tan ⁇ ) at the bonding temperature of the intermediate layer in contact with the adhesive layer is 0.5 or more. A method for bonding an adhesive sheet is described.
- the present invention has been made in view of the above circumstances, and provides an adhesive film for processing an electronic component capable of suppressing warpage of the electronic component after grinding.
- the inventors of the present invention have made extensive studies in order to achieve the above problems.
- the uneven absorbent resin layer having a specific melting point (Tm) is used.
- the present invention has been completed by finding that it is possible to suppress warping of the electronic component after grinding.
- the following adhesive film is provided.
- An adhesive film used for processing electronic components A base material layer, a concavo-convex absorbent resin layer, and an adhesive resin layer are provided in this order,
- the uneven absorbent resin layer includes a thermoplastic resin,
- the melting point (Tm) of the uneven absorbent resin layer measured by a differential scanning calorimeter (DSC) is in the range of 10 ° C. or more and 50 ° C. or less,
- the said electronic component has a circuit formation surface,
- the storage elastic modulus G ′ of the uneven absorbent resin layer at 70 ° C. measured by a dynamic viscoelasticity measuring apparatus (twisting mode) is 1.0 ⁇ 10 4 Pa or more and 1.0 ⁇ 10 6 Pa or less.
- the adhesive film whose heat shrinkage rate of the said base material layer when heat-processing for 30 minutes at 150 degreeC is 0.05% or more and 1.2% or less.
- the thermoplastic resin is an adhesive film containing an ethylene / ⁇ -olefin copolymer.
- thermoplastic resin is an adhesive film further comprising an ethylene / polar monomer copolymer.
- a structure comprising: an electronic component having a circuit forming surface; and the adhesive film according to any one of [1] to [8], which is bonded to the circuit forming surface side of the electronic component.
- a method of manufacturing an electronic device comprising at least [10] In the method for manufacturing an electronic device according to the above [9], In the grinding step, a method of manufacturing an electronic device, wherein the surface of the electronic component opposite to the circuit forming surface is ground until the thickness of the electronic component becomes 250 ⁇ m or less.
- an adhesive film for processing an electronic component that can suppress warping of the electronic component after grinding.
- an adhesive film 100 is an adhesive film used for processing an electronic component, and includes a base material layer 10, an uneven absorbent resin layer 20, and an adhesive property.
- the resin layer 30 is provided in this order, and the uneven absorbent resin layer 20 contains a thermoplastic resin, and the uneven absorbent resin layer 20 has a melting point (Tm) of 10 as measured by a differential scanning calorimeter (DSC).
- Tm melting point
- DSC differential scanning calorimeter
- the electronic component has a circuit-forming surface within a range of from 50 ° C. to 50 ° C., and the surface of the electronic component opposite to the circuit-forming surface is arranged so that the thickness of the electronic component is 250 ⁇ m or less. Used for grinding.
- an uneven absorbent resin layer is provided between the base film and the adhesive resin layer in order to impart uneven absorbency to the adhesive film.
- Adhesive films are being studied.
- SiP System in Package
- thin finish grinding technology that realizes electronic parts such as semiconductor wafers with a thickness of 100 ⁇ m or less.
- the demand is growing.
- warpage may occur in an electronic component subjected to thin grinding. If the electronic component is warped, there is a concern that a defect may occur in the transport process or the electronic component may be cracked.
- the inventors of the present invention have made extensive studies in order to achieve the above problems.
- the uneven absorbent resin having a melting point (Tm) in the range of 10 ° C. or higher and 50 ° C. or lower. It has been found for the first time that warpage of an electronic component after grinding can be suppressed by using a layer. That is, according to the present embodiment, the uneven absorption having a melting point (Tm) measured by a differential scanning calorimeter (DSC) between 10 ° C. and 50 ° C. between the base material layer 10 and the adhesive resin layer 30.
- DSC differential scanning calorimeter
- the conductive resin layer 20 By providing the conductive resin layer 20, it is possible to obtain an adhesive film 100 for processing an electronic component that can suppress warping of the electronic component after grinding.
- the reason why the warp of the electronic component after grinding can be suppressed by using the adhesive film 100 according to the present embodiment is not clear, but the following reasons are conceivable.
- the temperature of the electronic component and the adhesive film rises due to wear of the electronic component, and as a result, the thermal expansion and adhesiveness of the electronic component are increased. It has been found that stress is generated in the electronic component due to the difference from the thermal expansion of the film, and as a result, the electronic component is warped.
- the present inventors have further studied based on the above findings.
- the uneven absorbent resin layer 20 having a melting point (Tm) measured by a differential scanning calorimeter (DSC) in the range of 10 ° C. or more and 50 ° C. or less, the thermal expansion of the electronic component and the adhesive film It is considered that the stress on the electronic component due to the difference from the thermal expansion can be relieved, and as a result, the warp of the electronic component after grinding can be effectively suppressed.
- Tm melting point measured by a differential scanning calorimeter
- uneven absorption at 70 ° C. is measured by a dynamic viscoelasticity measuring device (twist mode) from the viewpoint of further effectively suppressing warpage of the electronic component after grinding.
- the storage elastic modulus G ′ of the conductive resin layer 20 is preferably 1.0 ⁇ 10 4 Pa or more, more preferably 5.0 ⁇ 10 4 Pa or more, further preferably 1.0 ⁇ 10 5 Pa or more, and preferably Is 1.0 ⁇ 10 6 Pa or less, more preferably 5.0 ⁇ 10 5 Pa or less, and still more preferably 2.0 ⁇ 10 5 Pa or less.
- the storage elastic modulus G ′ of the uneven absorbent resin layer 20 at 70 ° C. can be controlled within the above range, for example, by controlling the type and blending ratio of each component constituting the uneven absorbent resin layer 20. .
- the total thickness of the pressure-sensitive adhesive film 100 according to this embodiment is preferably 25 ⁇ m or more and 1000 ⁇ m or less, more preferably 100 ⁇ m or more and 800 ⁇ m or less, and further preferably 150 ⁇ m or more and 600 ⁇ m, from the balance between mechanical properties and handleability. It is as follows.
- the adhesive film 100 according to the present embodiment may be provided with other layers such as an adhesive layer and an antistatic layer (not shown) between the respective layers as long as the effects of the present invention are not impaired.
- the adhesive layer the adhesiveness between the layers can be improved.
- the antistatic layer the antistatic property of the adhesive film 100 can be improved.
- the adhesive film 100 according to the present embodiment is used for protecting the surface of an electronic component or fixing the electronic component in a manufacturing process of an electronic device, and more specifically, in the manufacturing process of an electronic device. It is suitably used as a back grind tape used for protecting a circuit forming surface (that is, a circuit surface including a circuit pattern) of an electronic component in a process of grinding one electronic component (also referred to as a back grind process). Specifically, the adhesive film 100 is attached and protected on the circuit forming surface of the electronic component, and used for the step of grinding the surface opposite to the circuit forming surface. When having a bump electrode on the circuit forming surface, the adhesive film 100 according to this embodiment including the uneven absorbent resin layer 20 can be suitably applied.
- the adhesive film 100 which concerns on this embodiment can be used also for processes other than a grinding process.
- it can be used as a so-called dicing tape for dicing a semiconductor wafer or an epoxy mold wafer to obtain a plurality of individual semiconductor chips or packages.
- the adhesive film 100 according to the present embodiment has an electronic component thickness of 250 ⁇ m or less. It is particularly preferably used for thinly grinding an electronic component.
- the base material layer 10 is a layer provided for the purpose of improving the handling properties, mechanical properties, heat resistance, and other properties of the adhesive film 100.
- the base material layer 10 is not particularly limited as long as it has a mechanical strength capable of withstanding an external force applied when processing an electronic component, and examples thereof include a resin film.
- the resin constituting the substrate layer 10 include polyolefins such as polyethylene, polypropylene, poly (4-methyl-1-pentene), and poly (1-butene); polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and the like.
- Polyester Nylon-6, Nylon-66, Polyamide such as Polymethylene xylene adipamide; Polyacrylate; Polymethacrylate; Polyvinyl chloride; Polyimide; Polyetherimide; Polyamideimide; Ethylene / vinyl acetate copolymer; Polyacrylonitrile Polycarbonate, polystyrene, ionomer, polysulfone, polyethersulfone, polyetheretherketone, polyphenylene sulfide, polyphenylene ether, polyester elastomer Mention may be made of one or more selected from the like; de elastomer, elastomers such as polyimide-based elastomer.
- polypropylene polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, ethylene / vinyl acetate copolymer, polyester elastomer, polyamide elastomer, polyimide elastomer, and
- polybutylene terephthalate is preferred, and one or more selected from polyethylene terephthalate and polyethylene naphthalate are more preferred.
- the thermal contraction rate of the base material layer 10 when heat-treated at 150 ° C. for 30 minutes is preferably 0.05% or more and 1.2% or less from the viewpoint of further suppressing warpage of the electronic component after grinding, It is more preferably 0.05% or more and 1.0% or less, and particularly preferably 0.1% or more and 0.6% or less.
- the heat shrinkage rate of the base material layer 10 is equal to or less than the above upper limit, the base material can be used even when the adhesive film 100 is attached to an electronic component under heating or when the temperature of the adhesive film 100 is increased during grinding.
- the dimensional change of the layer 10 can be suppressed. As a result, the stress applied to the electronic component is reduced, and the warpage of the electronic component can be further suppressed.
- the heat shrinkage rate of the base material layer 10 is determined by setting the length in the flow direction (MD direction) of the base material layer 10 before heat treatment to L 0, and performing heat treatment at 150 ° C. for 30 minutes, and then room temperature (23 ° C.). after cooling, the MD direction of the base layer 10 a length when the L 1, can be calculated by 100 ⁇ (L 0 -L 1) / L 0 in.
- the base material layer 10 may be a single layer or two or more layers.
- the form of the resin film used to form the base material layer 10 may be a stretched film or a film stretched in a uniaxial direction or a biaxial direction. From the viewpoint of improving the mechanical strength of the film, a film stretched in a uniaxial direction or a biaxial direction is preferable.
- the base material layer 10 is preferably annealed in advance from the viewpoint of suppressing warpage of the electronic component after grinding.
- the base material layer 10 may be subjected to a surface treatment in order to improve adhesion with other layers. Specifically, corona treatment, plasma treatment, undercoat treatment, primer coat treatment, or the like may be performed.
- the thickness of the base material layer 10 is preferably 25 ⁇ m or more and 100 ⁇ m or less from the viewpoint of obtaining good film characteristics.
- the pressure-sensitive adhesive film 100 includes the uneven absorbent resin layer 20 between the base material layer 10 and the pressure-sensitive resin layer 30.
- the uneven absorbent resin layer 20 is a layer provided for the purpose of improving the followability of the adhesive film 100 to the circuit forming surface and improving the adhesion between the circuit forming surface and the adhesive film 100.
- the uneven absorbent resin layer 20 contains a thermoplastic resin, and has a melting point (Tm) measured by a differential scanning calorimeter (DSC) of 10 ° C. or more and 50 ° C. or less, preferably 15 ° C. or more and 40 ° C. or less. More preferably, it is 15 degreeC or more and 35 degrees C or less.
- the heat of fusion of the uneven absorbent resin layer 20 measured by a differential scanning calorimeter (DSC) is preferably 10 J / g or more and 100 J / g or less, more preferably 15 J / g or more and 80 J / g or less, and still more preferably 20 J / g. g to 60 J / g.
- thermoplastic resins When two or more thermoplastic resins are included, two or more melting points may be observed, but at least one melting point (Tm) may be in the above range.
- the two or more melting points are preferably 10 ° C. or more and 50 ° C. or less.
- the temperature giving the peak top of the endothermic peak is the melting point
- the endothermic peak area is the heat of fusion.
- 1st heating Temperature is raised from 30 ° C to 230 ° C at 10 ° C / min and held at 230 ° C for 5 minutes. Cooling: Temperature is lowered from 230 ° C to -100 at 10 ° C / min and held at -100 ° C for 5 minutes.
- 2nd heating Again, heat up to 230 ° C at 10 ° C / min
- the uneven absorbent resin layer 20 preferably includes an ethylene / ⁇ -olefin copolymer (A), and includes an ethylene / ⁇ -olefin copolymer (A) and an ethylene / polar monomer copolymer (B). Is more preferable. Thereby, it becomes possible to suppress the curvature of the electronic component after grinding more effectively.
- the total amount of the ethylene / ⁇ -olefin copolymer (A) and the ethylene / polar monomer copolymer (B) contained in the uneven absorbent resin layer 20 is 100 parts by mass.
- the content of the ethylene / polar monomer copolymer (B) in the uneven absorbent resin layer 20 is preferably 10 parts by mass or more, and more preferably 15 parts by mass or more.
- the content of the ethylene / polar monomer copolymer (B) in the uneven absorbent resin layer 20 is preferably 70 parts by mass or less from the viewpoint of more effectively suppressing warpage of the electronic component after grinding. Or less, more preferably 50 parts by mass or less, still more preferably 40 parts by mass or less, and particularly preferably 30 parts by mass or less.
- the ethylene / ⁇ -olefin copolymer (A) is, for example, a copolymer obtained by copolymerizing ethylene and an ⁇ -olefin having 3 to 20 carbon atoms.
- ⁇ -olefin for example, an ⁇ -olefin having 3 to 20 carbon atoms can be used alone or in combination of two or more. Among these, ⁇ -olefins having 10 or less carbon atoms are preferable, and ⁇ -olefins having 3 to 8 carbon atoms are particularly preferable.
- ⁇ -olefins include propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3,3-dimethyl-1-butene, 4-methyl-1- Examples include pentene, 1-octene, 1-decene, and 1-dodecene. Of 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 (A) may be a random copolymer or a block copolymer, but a random copolymer is preferred from the viewpoint of flexibility.
- ethylene / ⁇ -olefin copolymer (A) for example, Tafmer (registered trademark) manufactured by Mitsui Chemicals, ENGAGE (registered trademark) manufactured by DOW, EXACT (registered trademark) manufactured by ExxonMobil, Inc. And Kernel (trademark registered) manufactured by Japan Polyethylene Corporation.
- the density of the ethylene ⁇ alpha-olefin copolymer (A) is preferably 850 ⁇ 900kg / m 3, more preferably 850 ⁇ 880kg / m 3, more preferably 850 ⁇ 870 kg / m is 3.
- the density is equal to or higher than the lower limit, handling troubles such as blocking can be avoided.
- corrugated absorbent resin layer 20 which is excellent in uneven
- ethylene / polar monomer copolymer (B) examples include an ethylene / (meth) ethyl acrylate copolymer, an ethylene / (meth) methyl acrylate copolymer, and an ethylene / (meth) acryl.
- the ethylene / polar monomer copolymer (B) is selected from an ethylene / vinyl ester copolymer and an ethylene / unsaturated carboxylic acid ester copolymer from the balance between availability and performance. It is preferable to include one or two or more, and it is particularly preferable to include an ethylene / vinyl acetate copolymer.
- the ethylene / vinyl acetate copolymer is a copolymer of ethylene and vinyl acetate, for example, a random copolymer.
- the content ratio of the structural unit derived from vinyl acetate in the ethylene / vinyl acetate copolymer is preferably 5% by mass to 50% by mass, more preferably 10% by mass to 45% by mass, and still more preferably 15% by mass. % To 40% by mass.
- the adhesive film 100 is more excellent in the balance of flexibility, heat resistance, transparency, and mechanical properties.
- the uneven absorbent resin layer 20 is formed, the film formability is good.
- the vinyl acetate content can be measured according to JIS K7192: 1999.
- the ethylene / vinyl acetate copolymer is preferably a binary copolymer consisting only of ethylene and vinyl acetate.
- ethylene and vinyl acetate for example, vinyl formate, vinyl glycolate, vinyl propionate, vinyl benzoate.
- vinyl ester monomer such as acrylic acid, methacrylic acid, ethacrylic acid, or an acrylic monomer such as a salt or alkyl ester thereof may be included as a copolymerization component. .
- the amount of the copolymer component other than ethylene and vinyl acetate in the ethylene / vinyl acetate copolymer may be 0.5 mass% or more and 5 mass% or less. preferable.
- the melt flow rate (MFR) of the ethylene / polar monomer copolymer (B) measured under the conditions of 190 ° C. and 2.16 kg load according to JIS K7210: 1999 is preferably 0.1 to 50 g / 10 minutes, more preferably 0.2 to 45 g / 10 minutes, still more preferably 0.5 to 40 g / 10 minutes.
- MFR melt flow rate
- the MFR is not less than the above lower limit, the fluidity of the ethylene / polar monomer copolymer (B) is improved, and the moldability of the uneven absorbent resin layer 20 can be further improved.
- the MFR is not more than the above upper limit value, the molecular weight becomes high, so that adhesion to a roll surface such as a chill roll hardly occurs, and the uneven absorbent resin layer 20 having a more uniform thickness can be obtained.
- the uneven absorbent resin layer 20 can be obtained, for example, by dry blending or melt-kneading each component and then extrusion molding. Moreover, antioxidant can be added as needed.
- the thickness of the uneven absorbent resin layer 20 is not particularly limited as long as the unevenness of the circuit forming surface of the electronic component can be embedded, but is preferably 10 ⁇ m or more and 800 ⁇ m or less, for example, 50 ⁇ m or more and 600 ⁇ m. Or less, more preferably 100 ⁇ m or more and 500 ⁇ m or less.
- the adhesive film 100 includes an adhesive resin layer 30.
- the adhesive resin layer 30 is a layer provided on one surface side of the uneven absorbent resin layer 20, and contacts the circuit forming surface of the electronic component when the adhesive film 100 is attached to the circuit forming surface of the electronic component. It is a layer that adheres.
- Examples of the adhesive constituting the adhesive resin layer 30 include (meth) acrylic adhesives, silicone adhesives, urethane adhesives, olefin adhesives, and styrene adhesives.
- a (meth) acrylic pressure-sensitive adhesive having a (meth) acrylic resin as a base polymer is preferable from the viewpoint that the adhesive force can be easily adjusted.
- the adhesive constituting the adhesive resin layer 30 it is preferable to use a radiation cross-linking adhesive that reduces the adhesive strength by radiation.
- the pressure-sensitive adhesive resin layer 30 composed of the radiation-crosslinking-type pressure-sensitive adhesive is cross-linked by irradiation with radiation, and the adhesive force is remarkably reduced. Therefore, it is easy to peel the electronic component from the pressure-sensitive adhesive film 100.
- radiation include ultraviolet rays, electron beams, and infrared rays.
- an ultraviolet crosslinking adhesive is preferable.
- Examples of the (meth) acrylic resin contained in the (meth) acrylic pressure-sensitive adhesive include a homopolymer of a (meth) acrylic acid ester compound, a copolymer of a (meth) acrylic acid ester compound and a comonomer, and the like. It is done.
- Examples of (meth) acrylic acid ester compounds include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, hydroxyethyl (meth) acrylate, and hydroxypropyl (meth).
- Examples include acrylate, dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
- These (meth) acrylic acid ester compounds may be used individually by 1 type, and may be used in combination of 2 or more types.
- Examples of the comonomer constituting the (meth) acrylic copolymer include vinyl acetate, (meth) acrylonitrile, styrene, (meth) acrylic acid, itaconic acid, (meth) acrylamide, and methylol (meth) acrylic. Amide, maleic anhydride, etc. are mentioned. These comonomers may be used individually by 1 type, and may be used in combination of 2 or more types.
- Radiation-crosslinking (meth) acrylic adhesives include (meth) acrylic resins having a polymerizable carbon-carbon double bond in the molecule, and two or more polymerizable carbon-carbon double bonds in the molecule. Examples thereof include a pressure-sensitive adhesive obtained by crosslinking the (meth) acrylic resin with a crosslinking agent as necessary, which contains a low molecular weight compound and a photoinitiator.
- the (meth) acrylic resin having a polymerizable carbon-carbon double bond in the molecule is specifically obtained as follows. First, a monomer having an ethylenic double bond and a copolymerizable monomer having a functional group (P) are copolymerized. Next, a functional group (P) contained in the copolymer and a monomer having a functional group (Q) capable of causing an addition reaction, a condensation reaction or the like with the functional group (P) are combined into a double bond in the monomer. The reaction is carried out while leaving a polymerizable carbon-carbon double bond in the copolymer molecule.
- Examples of the monomer having an ethylenic double bond include alkyl alkyl esters such as methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, butyl (meth) acrylate, and ethyl (meth) acrylate.
- alkyl alkyl esters such as methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, butyl (meth) acrylate, and ethyl (meth) acrylate.
- monomers having an ethylenic double bond such as methacrylic acid alkyl ester monomers, vinyl esters such as vinyl acetate, (meth) acrylonitrile, (meth) acrylamide and styrene are used.
- Examples of the copolymerizable monomer having the functional group (P) include (meth) acrylic acid, maleic acid, 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate, N-methylol (meth) acrylamide, (meth) And acryloyloxyethyl isocyanate. These may be used alone or in combination of two or more.
- the proportion of the monomer having an ethylenic double bond and the copolymerizable monomer having a functional group (P) is such that the monomer having the ethylenic double bond is 70 to 99% by mass and has a functional group (P).
- the amount of the copolymerizable monomer is preferably 1 to 30% by mass.
- the monomer having an ethylenic double bond is 80 to 95% by mass, and the copolymerizable monomer having a functional group (P) is 5 to 20% by mass.
- the monomer which has the said functional group (Q) the monomer similar to the copolymerizable monomer which has the said functional group (P) can be mentioned, for example.
- a combination that easily undergoes an addition reaction such as a carboxyl group and an epoxy group, a carboxyl group and an aziridyl group, and a hydroxyl group and an isocyanate group is desirable.
- any reaction may be used as long as it is a reaction in which a polymerizable carbon-carbon double bond can be easily introduced, such as a condensation reaction between a carboxylic acid group and a hydroxyl group.
- Examples of low molecular weight compounds having two or more polymerizable carbon-carbon double bonds in the molecule include tripropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetraacrylate, and pentaerythritol. Examples include tetra (meth) acrylate, dipentaerythritol monohydroxypenta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. These may use 1 type (s) or 2 or more types.
- the amount of the low molecular weight compound having two or more polymerizable carbon-carbon double bonds in the molecule is preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. More preferably, it is 5 to 18 parts by mass.
- photoinitiator examples include benzoin, isopropyl benzoin ether, isobutyl benzoin ether, benzophenone, Michler ketone, chlorothioxanthone, dodecylthioxanthone, dimethylthioxanthone, diethylthioxanthone, acetophenone diethyl ketal, benzyl dimethyl ketal, 1-hydroxycyclohexyl phenyl ketone, 2 -Hydroxy-2-methyl-1-phenylpropan-1-one and the like. These may be used alone or in combination of two or more.
- the addition amount of the photoinitiator is preferably 0.1 to 15 parts by mass, more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin.
- a crosslinking agent may be added to the ultraviolet curable pressure-sensitive adhesive.
- the cross-linking agent include epoxy compounds such as sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, tetramethylolmethane-tri- ⁇ -aziridinyl propionate, Trimethylolpropane-tri- ⁇ -aziridinylpropionate, N, N′-diphenylmethane-4,4′-bis (1-aziridinecarboxamide), N, N′-hexamethylene-1,6-bis ( 1-aziridinecarboxamide) and the like, and isocyanate compounds such as tetramethylene diisocyanate, hexamethylene diisocyanate, and polyisocyanate.
- the ultraviolet curable pressure-sensitive adhesive may be any of a solvent type, an emul
- the content of the cross-linking agent is usually preferably in a range where the number of functional groups in the cross-linking agent does not exceed the number of functional groups in the (meth) acrylic resin. However, when a functional group is newly generated by the crosslinking reaction, or when the crosslinking reaction is slow, it may be contained excessively as necessary.
- the content of the cross-linking agent in the (meth) acrylic pressure-sensitive adhesive is 0.100 parts by weight with respect to 100 parts by weight of the (meth) acrylic resin from the viewpoint of improving the balance between the heat resistance and adhesion of the pressure-sensitive resin layer 30. It is preferable that they are 1 mass part or more and 15 mass parts or less.
- the adhesive resin layer 30 can be formed by, for example, applying an adhesive coating liquid on the uneven absorbent resin layer 20.
- a method for applying the adhesive coating solution for example, a conventionally known coating method such as a roll coater method, a reverse roll coater method, a gravure roll method, a bar coat method, a comma coater method, or a die coater method can be employed.
- the drying conditions of the applied pressure-sensitive adhesive are not particularly limited, but in general, drying is preferably performed for 10 seconds to 10 minutes in a temperature range of 80 to 200 ° C. More preferably, it is dried at 80 to 170 ° C. for 15 seconds to 5 minutes.
- it may be heated at 40 to 80 ° C. for about 5 to 300 hours.
- the thickness of the adhesive resin layer 30 is not particularly limited, but is preferably 1 ⁇ m to 100 ⁇ m, more preferably 3 ⁇ m to 80 ⁇ m, and more preferably 5 ⁇ m to 60 ⁇ m. The following is more preferable.
- the uneven absorbent resin layer 20 is formed on one surface of the base material layer 10 by extrusion lamination.
- the pressure-sensitive adhesive resin layer 30 is formed by applying a pressure-sensitive adhesive coating solution on the uneven absorbent resin layer 20 and drying it, whereby the pressure-sensitive adhesive film 100 can be obtained.
- the base material layer 10 and the uneven absorbent resin layer 20 may be formed by coextrusion molding, or the film-like base material layer 10 and the film-like uneven absorbent resin layer 20 are laminated (laminated). May be formed.
- the electronic device manufacturing method includes at least the following two steps.
- the adhesive film 100 the adhesive film 100 according to the present embodiment is used.
- the method for manufacturing an electronic device according to the present embodiment is characterized in that the adhesive film 100 according to the present embodiment is used as a so-called back grind tape when the back surface of the electronic component is ground.
- a structure including an electronic component having a circuit forming surface and an adhesive film 100 bonded to the circuit forming surface side of the electronic component is prepared.
- a structure peels the release film from the adhesive resin layer 30 of the adhesive film 100, exposes the surface of the adhesive resin layer 30, and on the adhesive resin layer 30, the electronic component It can be manufactured by attaching a circuit forming surface.
- conditions for attaching the circuit forming surface of the electronic component to the adhesive film 100 are not particularly limited.
- the temperature is 30 to 80 ° C.
- the pressure is 0.05 to 0.5 MPa
- the attaching speed is 0. .5 to 20 mm / sec.
- the step (A) preferably further includes a step (A2) of producing a structure by heating and sticking the adhesive film 100 to the circuit forming surface of the electronic component.
- the heating temperature is not particularly limited, but is, for example, 60 to 80 ° C.
- the operation of adhering the adhesive film 100 to an electronic component may be performed manually, but can be generally performed by an apparatus called an automatic applicator equipped with a roll-shaped adhesive film.
- an electronic component stuck on the adhesive film 100 It is preferable that it is an electronic component which has a circuit formation surface.
- a semiconductor wafer, an epoxy mold wafer, a mold panel, a mold array package, a semiconductor substrate and the like can be mentioned, and a semiconductor wafer and an epoxy mold wafer are preferable.
- semiconductor wafers include silicon wafers, sapphire wafers, germanium wafers, germanium-arsenic wafers, gallium-phosphorus wafers, gallium-arsenic-aluminum wafers, gallium-arsenic wafers, lithium tantalate wafers, and the like. Is preferably used.
- the epoxy mold wafer examples include a wafer produced by an eWLB (Embedded Wafer Level Ball Grid Array) process, which is one of the methods for producing a fan-out type WLP. Although it does not specifically limit as a semiconductor wafer which has a circuit formation surface, and an epoxy mold wafer, For example, it is used for the thing by which circuits, such as wiring, a capacitor, a diode, or a transistor, were formed in the surface. Further, plasma treatment may be performed on the circuit formation surface.
- eWLB embedded Wafer Level Ball Grid Array
- the circuit formation surface of the electronic component is an uneven surface by having electrodes, for example.
- the electrode is bonded to the electrode formed on the mounting surface, and electricity between the electronic device and the mounting surface (mounting surface such as a printed board) is provided.
- the electrode include bump electrodes such as a ball bump, a printed bump, a stud bump, a plating bump, and a pillar bump. That is, the electrode is usually a convex electrode.
- These bump electrodes may be used alone or in combination of two or more.
- the height and diameter of the bump electrode are not particularly limited, but each is preferably 10 to 400 ⁇ m, more preferably 50 to 300 ⁇ m.
- the bump pitch at that time is not particularly limited, but is preferably 20 to 600 ⁇ m, more preferably 100 to 500 ⁇ m.
- the metal species constituting the bump electrode is not particularly limited, and examples thereof include solder, silver, gold, copper, tin, lead, bismuth, and alloys thereof. In the case of, it is used suitably. These metal species may be used alone or in combination of two or more.
- a surface (hereinafter also referred to as a back surface) opposite to the circuit forming surface side of the electronic component is ground (also referred to as a back grind).
- grinding means that the electronic component is thinned to a predetermined thickness without breaking or breaking the electronic component.
- the structure is fixed to a chuck table or the like of a grinding machine, and the back surface (circuit non-formed surface) of the electronic component is ground.
- the electronic component is ground until the thickness becomes 250 ⁇ m or less. If necessary, it may be cut thinner than 100 ⁇ m.
- the thickness of the electronic component before grinding is appropriately determined depending on the diameter and type of the electronic component, and the thickness of the electronic component after grinding is appropriately determined depending on the size of the chip to be obtained, the type of circuit, and the like.
- the adhesive film 100 according to the present embodiment is used, the warp of the electronic component is suppressed. It becomes possible.
- the thickness of the electronic component is 250 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, while suppressing warpage of the electronic component. It is possible to grind the surface opposite to the circuit forming surface side of the electronic component until it becomes 100 ⁇ m or less.
- the thickness of the electronic component according to the present embodiment does not include the height of irregularities such as electrodes. That is, the thickness of the electronic component according to the present embodiment refers to the thickness of the wafer or substrate.
- the backside grinding method is not particularly limited, but a known grinding method can be adopted. Grinding can be performed while cooling water by applying water to an electronic component and a grindstone. If necessary, a dry polishing process, which is a grinding method that does not use grinding water, can be performed at the end of the grinding process. After the back grinding, chemical etching is performed as necessary. Chemical etching adheres to an etching solution selected from the group consisting of acidic aqueous solutions made of hydrofluoric acid, nitric acid, sulfuric acid, acetic acid and the like alone or in a mixed solution, alkaline aqueous solutions such as potassium hydroxide aqueous solution and sodium hydroxide aqueous solution.
- the etching is performed for the purpose of removing distortion generated on the back surface of the electronic component, further thinning the electronic component, removing an oxide film, etc., pretreatment when forming the electrode on the back surface, and the like.
- the etching solution is appropriately selected according to the above purpose.
- a peeling step (C) for peeling the adhesive film 100 from the surface of the electronic component may be performed after the grinding step or chemical etching is completed. This series of operations may be performed manually, but can generally be performed by an apparatus called an automatic peeling machine. You may wash
- the electronic component may be diced into individual pieces to obtain a semiconductor chip, or the step of mounting the obtained semiconductor chip on a circuit board may be further performed. . These steps can be performed based on known information.
- Resin 1 Ethylene / propylene copolymer (Mitsui Chemicals, trade name: Toughmer P0275, density: 861 kg / m 3 , melt flow rate (190 ° C.): 2.9 g / 10 min)
- Resin 2 Ethylene / vinyl acetate copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name: Everflex EV170, vinyl acetate content: 33% by mass, density: 960 kg / m 3 , melt flow rate (190 ° C.): 1 g / 10 minutes)
- Resin 3 Ethylene / vinyl acetate copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name: Evaflex EV150, vinyl acetate content: 33% by mass, density: 960 kg / m 3 , melt flow rate (
- the obtained solution was cooled, and 25 parts by mass of xylene, 5 parts by mass of acrylic acid, and 0.5 parts by mass of tetradecyldimethylbenzylammonium chloride were added to the cooled solution, and the air was blown at 32 ° C at 85 ° C. It was made to react for time, and the adhesive polymer solution was obtained.
- ⁇ Adhesive coating solution for adhesive resin layer For 100 parts by mass of the pressure-sensitive adhesive polymer (solid content), 7 parts by mass of benzyldimethyl ketal (manufactured by BASF, trade name: Irgacure 651) as a photoinitiator, isocyanate-based crosslinking agent (manufactured by Mitsui Chemicals, trade name: ole 1 part by mass of Star P49-75S) and 12 parts by mass of dipentaerythritol hexaacrylate (manufactured by Toagosei Co., Ltd., trade name: Aronix M-400) were added to obtain an adhesive coating solution for the adhesive resin layer.
- benzyldimethyl ketal manufactured by BASF, trade name: Irgacure 651
- isocyanate-based crosslinking agent manufactured by Mitsui Chemicals, trade name: ole 1 part by mass of Star P49-75S
- Tuffmer P0275 80 parts by mass
- Evaflex EV170 20 parts by mass
- the polyethylene terephthalate film 50 ⁇ m serving as a base material layer is extruded and laminated using a single screw extruder so that the dry blend of the above-described uneven absorbent resin has a thickness of 350 ⁇ m.
- a laminated film of the uneven absorbent resin layer was obtained.
- an adhesive coating solution for the adhesive resin layer was applied to a polyethylene terephthalate film (38 ⁇ m) subjected to silicone release treatment, and then dried to form an adhesive resin layer having a thickness of 40 ⁇ m. Subsequently, the obtained adhesive resin layer was bonded to the uneven absorbent resin layer side of the above-mentioned laminated film, thereby obtaining an adhesive film. The following evaluation was performed about the obtained adhesive film. The obtained results are shown in Table 1.
- Tm Melting point
- DSC differential scanning calorimeter
- the melting point (Tm) and heat of fusion were determined from the endothermic peak in a graph of 2nd heating when the horizontal axis represents temperature and the vertical axis represents DSC.
- the melting point was determined from the temperature giving the peak top of the endothermic peak, and the heat of fusion was determined from the area of the endothermic peak.
- FIG. 2 is a schematic diagram for explaining the bump absorption diameter.
- a background protective tape affixing device (DR3000II, manufactured by Nitto Seiki Co., Ltd.)
- the adhesive film 100 is formed into an 8-inch bump wafer 200 (solder bump 250, bump height: 200 ⁇ m, bump diameter: 270 ⁇ m, bump pitch: 400 ⁇ m).
- the obtained adhesive film-attached wafer was observed with an optical microscope (manufactured by Olympus Corporation, MX61L), and the bump absorption diameter D of the adhesive film was measured from the site where floating was observed in the image measurement mode.
- a smaller bump absorption diameter D means that the surrounding float is smaller and the bump absorption is superior.
- Example 2 A pressure-sensitive adhesive film was produced in the same manner as in Example 1 except that the composition of Toughmer P0275 and Evaflex EV170 serving as the uneven absorbent resin layer was changed to the values shown in Table 1. Each evaluation was performed in the same manner as in Example 1. The obtained results are shown in Table 1.
- Example 3 A pressure-sensitive adhesive film was produced in the same manner as in Example 1 except that the composition of Toughmer P0275 and Evaflex EV170 serving as the uneven absorbent resin layer was changed to the values shown in Table 1. Each evaluation was performed in the same manner as in Example 1. The obtained results are shown in Table 1.
- Example 1 A pressure-sensitive adhesive film was produced in the same manner as in Example 1 except that EVAFLEX EV150 was used as the thermoplastic resin constituting the uneven absorbent resin layer. Moreover, each evaluation was performed similarly to Example 1 except the storage elastic modulus G 'at 70 degreeC of the following (2) uneven
- the adhesive films of Examples 1 to 3 using the uneven absorbent resin layer having a melting point (Tm) measured by a differential scanning calorimeter (DSC) in the range of 10 ° C. or more and 50 ° C. or less are used.
- the amount of warping of the semiconductor wafer after grinding was small, which was a good result.
- the bump absorption diameter of the adhesive film of the example was close to the bump diameter of 270 ⁇ m of the bump wafer. That is, the pressure-sensitive adhesive films of the examples were excellent in unevenness absorbability.
- the base layer, the uneven absorbent resin layer, and the adhesive resin layer are provided in this order, and the melting point (Tm) of the uneven absorbent resin layer is in the range of 10 ° C.
- the adhesive film 100 according to the embodiment can suppress warpage of the semiconductor wafer after grinding and is excellent in unevenness absorbability.
- the adhesive film of Comparative Example 1 in which the melting point (Tm) of the uneven absorbent resin layer exceeds 50 ° C. has a large amount of warpage of the semiconductor wafer after grinding, and the warpage of the semiconductor wafer after grinding cannot be suppressed. Understandable. Further, a bump absorption diameter 70 ⁇ m larger than the bump diameter of the wafer was observed. That is, it can be understood that the adhesive film of the comparative example is inferior in unevenness absorbability than the adhesive film of the example.
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Abstract
Description
このような粘着性フィルムには、一般的に、基材フィルムに粘着性樹脂層を積層させたフィルムが用いられている。
一方で、回路形成面の凹凸が大きい電子部品に関しては、粘着性フィルムに凹凸吸収性を付与するために、基材フィルムと粘着性樹脂層との間に凹凸吸収性樹脂層を設けた粘着性フィルムが検討されている。
本発明者らの検討によれば、薄研削をおこなった電子部品に反りが発生する場合があることが明らかになった。電子部品に反りがあると、搬送工程で不具合が生じたり、電子部品に割れが生じたりする懸念がある。
電子部品を加工するために用いられる粘着性フィルムであって、
基材層と、凹凸吸収性樹脂層と、粘着性樹脂層と、をこの順番に備え、
上記凹凸吸収性樹脂層は、熱可塑性樹脂を含み、
示差走査熱量計(DSC)により測定される、上記凹凸吸収性樹脂層の融点(Tm)が10℃以上50℃以下の範囲内にあり、
上記電子部品は回路形成面を有し、上記電子部品の厚みが250μm以下になるように、上記電子部品の当該回路形成面とは反対側の面を研削するために用いられる粘着性フィルム。
[2]
上記[1]に記載の粘着性フィルムにおいて、
動的粘弾性測定装置(ねじりモード)により測定される、70℃での上記凹凸吸収性樹脂層の貯蔵弾性率G’が1.0×104Pa以上1.0×106Pa以下である粘着性フィルム。
[3]
上記[1]または[2]に記載の粘着性フィルムにおいて、
150℃で30分間熱処理したときの上記基材層の熱収縮率が0.05%以上1.2%以下である粘着性フィルム。
[4]
上記[1]乃至[3]のいずれか一つに記載の粘着性フィルムにおいて、
上記熱可塑性樹脂はエチレン・α-オレフィン共重合体を含む粘着性フィルム。
[5]
上記[4]に記載の粘着性フィルムにおいて、
上記熱可塑性樹脂はエチレン・極性モノマー共重合体をさらに含む粘着性フィルム。
[6]
上記[5]に記載の粘着性フィルムにおいて、
上記エチレン・極性モノマー共重合体がエチレン・酢酸ビニル共重合体を含む粘着性フィルム。
[7]
上記[5]または[6]に記載の粘着性フィルムにおいて、
上記凹凸吸収性樹脂層に含まれる上記エチレン・α-オレフィン共重合体および上記エチレン・極性モノマー共重合体の合計量を100質量部としたとき、
上記凹凸吸収性樹脂層中の上記エチレン・極性モノマー共重合体の含有量が10質量部以上70質量部以下である粘着性フィルム。
[8]
上記[1]乃至[7]のいずれか一つに記載の粘着性フィルムにおいて、
上記電子部品は上記回路形成面にバンプ電極を有する粘着性フィルム。
[9]
回路形成面を有する電子部品と、上記電子部品の前記回路形成面側に貼り合わされ、かつ、上記[1]乃至[8]のいずれか一つに記載の粘着性フィルムと、を備える構造体を準備する準備工程と、
上記電子部品の上記回路形成面側とは反対側の面を研削する研削工程と、
を少なくとも備える電子装置の製造方法。
[10]
上記[9]に記載の電子装置の製造方法において、
上記研削工程では、上記電子部品の厚みが250μm以下になるまで上記電子部品の上記回路形成面側とは反対側の面の研削をおこなう電子装置の製造方法。
図1は、本発明に係る実施形態の粘着性フィルム100の構造の一例を模式的に示した断面図である。
図1に示すように、本実施形態に係る粘着性フィルム100は、電子部品を加工するために用いられる粘着性フィルムであって、基材層10と、凹凸吸収性樹脂層20と、粘着性樹脂層30と、をこの順番に備え、凹凸吸収性樹脂層20は、熱可塑性樹脂を含み、示差走査熱量計(DSC)により測定される、凹凸吸収性樹脂層20の融点(Tm)が10℃以上50℃以下の範囲内にあり、上記電子部品は回路形成面を有し、上記電子部品の厚みが250μm以下になるように、上記電子部品の当該回路形成面とは反対側の面を研削するために用いられる。
ここで、近年、携帯電話等のデジタル・モバイル機器に使用されるSiP(System in Package)等の普及に伴い、例えば厚さ100μm以下の半導体ウエハ等の電子部品を実現する薄仕上げ研削技術への要求が高まっている。
しかし、本発明者らの検討によれば、薄研削をおこなった電子部品に反りが発生する場合があることが明らかになった。電子部品に反りがあると、搬送工程で不具合が生じたり、電子部品に割れが生じたりする懸念がある。
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、基材層と、凹凸吸収性樹脂層と、粘着性樹脂層と、をこの順番に備える粘着性フィルムにおいて、融点(Tm)が10℃以上50℃以下の範囲にある凹凸吸収性樹脂層を用いることにより、研削後の電子部品の反りを抑制することができることを初めて見出した。
すなわち、本実施形態によれば、基材層10と粘着性樹脂層30との間に、示差走査熱量計(DSC)により測定される融点(Tm)が10℃以上50℃以下である凹凸吸収性樹脂層20を設けることによって、研削後の電子部品の反りを抑制することが可能な電子部品加工用の粘着性フィルム100を得ることができる。
本実施形態に係る粘着性フィルム100を用いることにより、研削後の電子部品の反りを抑制することが可能である理由は明らかでないが、以下の理由が考えられる。
まず、本発明者らの検討によれば、電子部品を研削する工程において、電子部品が摩耗することによって、電子部品および粘着性フィルムの温度が上がり、その結果、電子部品の熱膨張と粘着性フィルムの熱膨張との差によって、電子部品に応力が生じ、その結果、電子部品に反りが生じてしまうことを知見した。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、示差走査熱量計(DSC)により測定される融点(Tm)が10℃以上50℃以下の範囲にある凹凸吸収性樹脂層20を設けることによって、電子部品の熱膨張と粘着性フィルムの熱膨張との差による電子部品への応力が緩和でき、その結果、研削後の電子部品の反りを効果的に抑制することができると考えられる。
70℃での凹凸吸収性樹脂層20の貯蔵弾性率G’は、例えば、凹凸吸収性樹脂層20を構成する各成分の種類や配合割合を制御することにより上記範囲内に制御することができる。
なお、本実施形態に係る粘着性フィルム100は、研削工程以外の加工にも用いることができる。例えば、半導体ウエハやエポキシモールドウエハをダイシングして複数の個片化された半導体チップやパッケージを得るための、いわゆるダイシングテープとして用いることができる。
また、厚みが250μm以下になるまで電子部品を薄く研削する場合に電子部品の反りが発生しやすくなるため、本実施形態に係る粘着性フィルム100は電子部品の厚みが250μm以下になるように、電子部品を薄く研削するために特に好適に用いられる。
基材層10は、粘着性フィルム100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、電子部品を加工する際に加わる外力に耐えうる機械的強度があれば特に限定されないが、例えば、樹脂フィルムが挙げられる。
基材層10を構成する樹脂としては、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;ポリイミド;ポリエーテルイミド;ポリアミドイミド;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;ポリエーテルエーテルケトン;ポリフェニレンスルフィド;ポリフェニレンエーテル;ポリエステル系エラストマー、ポリアミド系エラストマー、ポリイミド系エラストマー等のエラストマー;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、機械物性および透明性を良好にする観点から、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、エチレン・酢酸ビニル共重合体、ポリエステル系エラストマー、ポリアミド系エラストマー、ポリイミド系エラストマー、およびポリブチレンテレフタレート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一種または二種以上がより好ましい。
ここで、基材層10の熱収縮率は、熱処理前の基材層10の流れ方向(MD方向)の長さをL0とし、150℃で30分間熱処理した上で、室温(23℃)に冷却した後の、基材層10のMD方向の長さをL1としたとき、100×(L0-L1)/L0により算出することができる。
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は研削後の電子部品の反りを抑制する観点から、予めアニール処理されているものが好ましい。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。
本実施形態に係る粘着性フィルム100は、基材層10と粘着性樹脂層30との間に凹凸吸収性樹脂層20を備える。
凹凸吸収性樹脂層20は、粘着性フィルム100の回路形成面への追従性を良好にし、回路形成面と粘着性フィルム100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。
熱可塑性樹脂を2成分以上含むと、2つ以上の融点が観測されることもあるが、少なくとも一つの融点(Tm)が上記範囲にあればよい。当該2つ以上の融点がいずれも10℃以上50℃以下であることが好ましい。
融点および融解熱は、次に示す測定条件でDSC測定を行った際の2nd加熱時のグラフにおいて、吸熱ピークのピークトップを与える温度を融点、吸熱ピークの面積を融解熱とする。
<測定条件>
1st加熱:30℃から230℃まで10℃/分で昇温し、230℃で5分間保持
冷却:230℃から-100まで10℃/分で降温し、-100℃で5分間保持
2nd加熱:再度、230℃まで10℃/分で昇温
本実施形態に係るエチレン・α-オレフィン共重合体(A)は、例えば、エチレンと、炭素数3~20のα-オレフィンとを共重合することによって得られる共重合体である。
α-オレフィンとしては、例えば、炭素数3~20のα-オレフィンを1種類単独でまたは2種類以上を組み合わせて用いることができる。中でも好ましいのは、炭素数が10以下であるα-オレフィンであり、特に好ましいのは炭素数が3~8のα-オレフィンである。このようなα-オレフィンの具体例としては、プロピレン、1-ブテン、1-ペンテン、1-ヘキセン、3-メチル-1-ブテン、3,3-ジメチル-1-ブテン、4-メチル-1-ペンテン、1-オクテン、1-デセン、1-ドデセン等を挙げることができる。中でも、入手の容易さからプロピレン、1-ブテン、1-ペンテン、1-ヘキセン、4-メチル-1-ペンテンおよび1-オクテンが好ましい。エチレン・α-オレフィン共重合体(A)はランダム共重合体であっても、ブロック共重合体であってもよいが、柔軟性の観点からランダム共重合体が好ましい。
密度が上記下限値以上であると、ブロッキングなどのハンドリングトラブルを回避できる。また、密度が上記上限値以下であると、凹凸吸収性に優れる凹凸吸収性樹脂層20を得ることができる。
ASTM D1238に準拠し、190℃、2.16kg荷重の条件で測定される、エチレン・α-オレフィン共重合体(A)のメルトフローレ-ト(MFR)は、好ましくは0.1~50g/10分であり、より好ましくは0.2~30g/10分、さらに好ましくは0.5~20g/10分、特に好ましくは1.0~10g/10分である。
MFRが上記下限値以上であると、エチレン・α-オレフィン共重合体(A)の流動性が向上し、凹凸吸収性樹脂層20の加工性をより良好にすることができる。
また、MFRが上記上限値以下であると、より一層均一な厚みの凹凸吸収性樹脂層20を得ることができる。
本実施形態に係るエチレン・極性モノマー共重合体(B)としては、例えば、エチレン・(メタ)アクリル酸エチル共重合体、エチレン・(メタ)アクリル酸メチル共重合体、エチレン・(メタ)アクリル酸プロピル共重合体、エチレン・(メタ)アクリル酸ブチル共重合体、エチレン・(メタ)アクリル酸ヘキシル共重合体、エチレン・(メタ)アクリル酸-2-ヒドロキシエチル共重合体、エチレン・(メタ)アクリル酸-2-ヒドロキシプロピル共重合体、エチレン・(メタ)アクリル酸グリシジル共重合体、エチレン・マレイン酸ジメチル共重合体、エチレン・マレイン酸ジエチル共重合体、エチレン・フマル酸ジメチル共重合体、エチレン・フマル酸ジエチル共重合体等のエチレン・不飽和カルボン酸エステル共重合体;エチレン・(メタ)アクリル酸共重合体、エチレン・マレイン酸共重合体、エチレン・フマル酸共重合体、エチレン・クロトン酸共重合体等のエチレン・不飽和カルボン酸共重合体およびそれらの塩;エチレン・酢酸ビニル共重合体、エチレン・プロピオン酸ビニル共重合体、エチレン・酪酸ビニル共重合体、エチレン・ステアリン酸ビニル共重合体等のエチレン・ビニルエステル共重合体:エチレン・スチレン共重合体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、上記エチレン・極性モノマー共重合体(B)としては、その入手容易性と性能とのバランスからエチレン・ビニルエステル共重合体およびエチレン・不飽和カルボン酸エステル共重合体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く、エチレン・酢酸ビニル共重合体を含むことが特に好ましい。
上記エチレン・酢酸ビニル共重合体中の酢酸ビニルに由来する構成単位の含有割合は、好ましくは5質量%以上50質量%以下、より好ましくは10質量%以上45質量%以下、さらに好ましくは15質量%以上40質量%以下である。酢酸ビニルの含有量がこの範囲にあると、粘着性フィルム100の柔軟性、耐熱性、透明性、機械的性質のバランスにより一層優れる。また、凹凸吸収性樹脂層20を成膜する際にも、成膜性が良好となる。
酢酸ビニル含有量は、JIS K7192:1999に準拠して測定可能である。
MFRが上記下限値以上であると、エチレン・極性モノマー共重合体(B)の流動性が向上し、凹凸吸収性樹脂層20の成形加工性をより良好にすることができる。
また、MFRが上記上限値以下であると、分子量が高くなるためチルロール等のロール面への付着が起こり難くなり、より一層均一な厚みの凹凸吸収性樹脂層20を得ることができる。
本実施形態に係る粘着性フィルム100は粘着性樹脂層30を備える。
粘着性樹脂層30は、凹凸吸収性樹脂層20の一方の面側に設けられる層であり、粘着性フィルム100を電子部品の回路形成面に貼り付ける際に、電子部品の回路形成面に接触して粘着する層である。
放射線架橋型粘着剤により構成された粘着性樹脂層30は、放射線の照射により架橋して粘着力が著しく減少するため、粘着性フィルム100から電子部品を剥離し易くなる。放射線としては、紫外線、電子線、赤外線等が挙げられる。
放射線架橋型粘着剤としては、紫外線架橋型粘着剤が好ましい。
また、(メタ)アクリル系共重合体を構成するコモノマーとしては、例えば、酢酸ビニル、(メタ)アクリルニトリル、スチレン、(メタ)アクリル酸、イタコン酸、(メタ)アクリルアマイド、メチロール(メタ)アクリルアマイド、無水マレイン酸等が挙げられる。これらのコモノマーは一種単独で用いてもよく、二種以上を併用して用いてもよい。
上記エチレン性二重結合を有するモノマーと官能基(P)を有する共重合性モノマーの割合は、上記エチレン性二重結合を有するモノマーが70~99質量%であり、官能基(P)を有する共重合性モノマーが1~30質量%であることが好ましい。さらに好ましくは、上記エチレン性二重結合を有するモノマーが80~95質量%であり、官能基(P)を有する共重合性モノマーが5~20質量%である。
上記官能基(Q)を有するモノマーとしては、例えば、上記官能基(P)を有する共重合性モノマーと同様のモノマーを挙げることができる。
(メタ)アクリル系粘着剤中の架橋剤の含有量は、粘着性樹脂層30の耐熱性や密着力とのバランスを向上させる観点から、(メタ)アクリル系樹脂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。
粘着剤塗布液を塗布する方法としては、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、ダイコーター法等の従来公知の塗布方法を採用することができる。塗布された粘着剤の乾燥条件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。更に好ましくは、80~170℃において、15秒~5分間乾燥する。架橋剤と(メタ)アクリル系樹脂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。
まず、基材層10の一方の面に凹凸吸収性樹脂層20を押出しラミネート法によって形成する。次いで、凹凸吸収性樹脂層20上に粘着剤塗布液を塗布し乾燥させることによって粘着性樹脂層30を形成し、粘着性フィルム100を得ることができる。
また、基材層10と凹凸吸収性樹脂層20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とフィルム状の凹凸吸収性樹脂層20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。
(A)回路形成面を有する電子部品と、上記電子部品の上記回路形成面側に貼り合わされた粘着性フィルム100と、を備える構造体を準備する準備工程
(B)上記電子部品の上記回路形成面側とは反対側の面を研削する研削工程
そして、粘着性フィルム100として、本実施形態に係る粘着性フィルム100を使用する。本実施形態に係る電子装置の製造方法は、電子部品の裏面を研削する際に、本実施形態に係る粘着性フィルム100を、いわゆるバックグラインドテープとして用いることに特徴がある。
以下、本実施形態に係る電子装置の製造方法の各工程について説明する。
はじめに、回路形成面を有する電子部品と、電子部品の回路形成面側に貼り合わされた粘着性フィルム100と、を備える構造体を準備する。
このような構造体は、例えば、粘着性フィルム100の粘着性樹脂層30から離型フィルムを剥離し、粘着性樹脂層30の表面を露出させ、その粘着性樹脂層30上に、電子部品の回路形成面を貼り付けることにより作製することができる。
また、半導体ウエハは、例えば、シリコンウエハ、サファイアウエハ、ゲルマニウムウエハ、ゲルマニウム-ヒ素ウエハ、ガリウム-リンウエハ、ガリウム-ヒ素-アルミニウムウエハ、ガリウム-ヒ素ウエハ、タンタル酸リチウムウエハ等が挙げられるが、シリコンウエハに好適に用いられる。エポキシモールドウエハは、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)プロセスによって作製されたウエハが挙げられる。
回路形成面を有する半導体ウエハおよびエポキシモールドウエハとしては特に限定されないが、例えば、表面に配線、キャパシタ、ダイオードまたはトランジスタ等の回路が形成されたものに用いられる。また、回路形成面にプラズマ処理がされていてもよい。
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。
バンプ電極の高さおよび径は特に限定されないが、それぞれ、好ましくは10~400μm、より好ましくは50~300μmである。その際のバンプピッチにおいても特に限定されないが、好ましくは20~600μm、より好ましくは100~500μmである。
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、はんだ、銀、金、銅、錫、鉛、ビスマス及びこれらの合金等が挙げられるが、粘着性フィルム100はバンプ電極がはんだバンプの場合に好適に用いられる。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。
次に、上記電子部品の上記回路形成面側とは反対側の面(以下、裏面とも呼ぶ。)を研削(バックグラインドとも呼ぶ。)する。
ここで、研削するとは、電子部品を割ったり、破損したりすることなく、所定の厚みまで薄化加工することを意味する。
例えば、研削機のチャックテーブル等に上記構造体を固定し、電子部品の裏面(回路非形成面)を研削する。
ここで、厚みが250μm以下になるまで電子部品を薄く研削する場合に電子部品の反りが発生しやすくなるが、本実施形態に係る粘着性フィルム100を用いれば、この電子部品の反りを抑制することが可能となる。
したがって、本実施形態に係る電子装置の製造方法において、研削工程(B)では、電子部品の反りを抑制しながら、電子部品の厚みが250μm以下、好ましくは200μm以下、より好ましくは150μm以下、さらに好ましくは100μm以下になるまで電子部品の回路形成面側とは反対側の面の研削をおこなうことが可能である。
本実施形態に係る電子部品の厚みには、電極等の凹凸の高さは含まれない。すなわち、本実施形態に係る電子部品の厚みは、ウエハや基板の厚みをいう。
本実施形態に係る電子装置の製造方法において、研削工程やケミカルエッチング終了後、粘着性フィルム100を電子部品表面から剥離する剥離工程(C)をおこなってもよい。この一連の操作は、人手により行われる場合もあるが、一般には自動剥がし機と称される装置により行うことができる。
粘着性フィルム100を剥離した後の電子部品の表面は、必要に応じて洗浄してもよい。洗浄方法としては、水洗浄、溶剤洗浄等の湿式洗浄、プラズマ洗浄等の乾式洗浄等が挙げられる。湿式洗浄の場合、超音波洗浄を併用してもよい。これらの洗浄方法は、電子部品の表面の汚染状況により適宜選択することができる。
工程(A)~工程(C)を行った後、電子部品をダイシングして個片化し、半導体チップを得る工程や、得られた半導体チップを回路基板に実装する工程等をさらに行ってもよい。これらの工程は、公知の情報に基づいておこなうことができる。
粘着性フィルムの作製に関する詳細は以下の通りである。
樹脂1:エチレン・プロピレン共重合体(三井化学社製、商品名:タフマーP0275、密度:861kg/m3、メルトフローレート(190℃):2.9g/10分)
樹脂2:エチレン・酢酸ビニル共重合体(三井デュポンポリケミカル社製、商品名:エバフレックスEV170、酢酸ビニル含量:33質量%、密度:960kg/m3、メルトフローレート(190℃):1g/10分)
樹脂3:エチレン・酢酸ビニル共重合体(三井デュポンポリケミカル社製、商品名:エバフレックスEV150、酢酸ビニル含量:33質量%、密度:960kg/m3、メルトフローレート(190℃):30g/10分)
アクリル酸エチル49質量部、アクリル酸-2-エチルヘキシル20質量部、アクリル酸メチル21質量部、メタクリル酸グリシジル10質量部、および重合開始剤としてベンゾイルパーオキサイド0.5質量部を混合した。得られた混合物を、トルエン65質量部および酢酸エチル50質量部が入った窒素置換フラスコ中に、撹拌しながら80℃で5時間かけて滴下し、さらに5時間撹拌して反応させた。反応終了後、得られた溶液を冷却し、冷却した溶液にキシレン25質量部、アクリル酸5質量部、およびテトラデシルジメチルベンジルアンモニウムクロライド0.5質量部を加え、空気を吹き込みながら85℃で32時間反応させ、粘着剤ポリマー溶液を得た。
粘着剤ポリマー(固形分)100質量部に対して、光開始剤としてベンジルジメチルケタール(BASF社製、商品名:イルガキュア651)7質量部、イソシアネート系架橋剤(三井化学社製、商品名:オレスターP49-75S)1質量部、ジペンタエリスリトールヘキサアクリレート(東亞合成社製、商品名:アロニックスM-400)12質量部を添加し、粘着性樹脂層用の粘着剤塗布液を得た。
凹凸吸収性樹脂層となるタフマーP0275(80質量部)およびエバフレックスEV170(20質量部)をドライブレンドした。次いで、基材層となるポリエチレンテレフタレートフィルム(50μm)上に、単軸押出機を用いて、上述の凹凸吸収性樹脂のドライブレンド物を厚さ350μmとなるように、押出しラミネートし、基材層と凹凸吸収性樹脂層の積層フィルムを得た。
(1)基材層の熱収縮率
JIS C2151に準拠し、基材層を150℃で30分間熱処理し、100×(L0-L1)/L0により基材層の熱収縮率を算出した。ここで、熱処理前の基材層10のMD方向の長さをL0とし、150℃で30分間熱処理した上で、室温に冷却した基材層10のMD方向の長さをL1とした。
凹凸吸収性樹脂層を厚さ2mmになるように重ね合わせ、次のような条件でプレス成形を行った。得られたプレスシートをφ25mmの円形に切り出し、試験片とした。
<プレス条件>
加熱温度:200℃、予熱時間:2分
本加圧荷重:15MPa、本加圧時間:2分
冷却温度:20℃、冷却時間:3分
次いで、動的粘弾性測定装置(ティーエーインスツルメンツ社製、製品名:ARES-G2)を用いて、得られた試験片を直径25mmのパラレルプレートに挟み、昇温速度5℃/分、温度範囲40℃~150℃、角周波数6.3rad/s、ねじりモードの条件での動的粘弾性の温度依存性を測定した。
得られたグラフから、70℃での凹凸吸収性樹脂層の貯蔵弾性率G’をそれぞれ求めた。
凹凸吸収性樹脂層の融点(Tm)および融解熱は、示差走査型熱量測定法(DSC)に従い、示差走査型熱量計(SII社製、製品名:X-DSC7000)によって測定した。試料約10mgをアルミパンの中に入れ、30℃から230℃まで10℃/分で昇温した後(1st加熱)、5分間保持した。次いで、-100℃まで10℃/分で冷却し、5分間保持した後、再度230℃まで10℃/分で昇温した(2nd加熱)。横軸に温度、縦軸にDSCをとった際の2nd加熱時のグラフにおいて、吸熱ピークから融点(Tm)および融解熱を求めた。融点は吸熱ピークのピークトップを与える温度から、融解熱は吸熱ピークの面積からそれぞれ求めた。
図2はバンプ吸収径を説明するための模式図である。バックグラウンド用保護テープ貼り付け装置(日東精機社製、DR3000II)を用いて、粘着性フィルム100を8インチのバンプウエハ200(はんだバンプ250、バンプ高さ:200μm、バンプ径:270μm、バンプピッチ:400μm)に貼り付けた(テーブル温度:70℃、ラミネート荷重:90%、ラミネート速度:2mm/s)。得られた粘着性フィルム貼付ウエハを光学顕微鏡(オリンパス社製、MX61L)で観察し、画像計測モードによって浮きが観測される部位から粘着性フィルムのバンプ吸収径Dを測定した。
バンプ吸収径Dは小さいほうが周囲の浮きが小さく、バンプ吸収性に優れることを意味する。
バックグラウンド用保護テープ貼り付け装置(日東精機製、DR3000II)を用いて、上記粘着性フィルムを12インチのミラーシリコンウエハに貼り付けた(テーブル温度:70℃、ラミネート荷重:90%、ラミネート速度:2mm/s)。得られた粘着性フィルム貼付ウエハをグラインダ/ポリッシャ装置(ディスコ社製、DGP8760)を用いて、シリコンウエハを厚さ50μmまで研削した。得られた研削後の粘着性フィルム貼付ウエハを粘着性フィルムが上側になるように平坦な場所に置き、反り上がった距離を測定した。
凹凸吸収性樹脂層となるタフマーP0275およびエバフレックスEV170の配合を表1に示す値とした以外は実施例1と同様にして、粘着性フィルムを作製した。また、実施例1と同様に各評価を行った。得られた結果を表1に示す。
凹凸吸収性樹脂層となるタフマーP0275およびエバフレックスEV170の配合を表1に示す値とした以外は実施例1と同様にして、粘着性フィルムを作製した。また、実施例1と同様に各評価を行った。得られた結果を表1に示す。
凹凸吸収性樹脂層を構成する熱可塑性樹脂としてエバフレックスEV150を用いた以外は実施例1と同様にして、粘着性フィルムを作製した。また、次に示す(2)凹凸吸収性樹脂層の70℃における貯蔵弾性率G’を除いて、実施例1と同様に各評価を行った。得られた結果を表1に示す。
(2)凹凸吸収性樹脂層の70℃における貯蔵弾性率G’
エバフレックスEV150のペレットを厚さ2mmになるように、次のような条件でプレス成形を行った。得られたプレスシートをφ25mmの円形に切り出し、試験片とした。
<プレス条件>
加熱温度:180℃、予熱時間:2分
本加圧荷重:15MPa、本加圧時間:2分
冷却温度:20℃、冷却時間:3分
次いで、動的粘弾性測定装置(ティーエーインスツルメンツ社製、製品名:ARES-G2)を用いて、得られた試験片を直径25mmのパラレルプレートに挟み、昇温速度5℃/分、温度範囲40℃~150℃、角周波数6.3rad/s、ねじりモードの条件での動的粘弾性の温度依存性を測定した。
得られたグラフから、70℃での凹凸吸収性樹脂層の貯蔵弾性率G’を求めた。
以上から、基材層と、凹凸吸収性樹脂層と、粘着性樹脂層と、をこの順番に備え、凹凸吸収性樹脂層の融点(Tm)が10℃以上50℃以下の範囲にある本実施形態に係る粘着性フィルム100は、研削後の半導体ウエハの反りを抑制することが可能であるとともに凹凸吸収性にも優れていることが理解できる。
これに対し、凹凸吸収性樹脂層の融点(Tm)が50℃を超える比較例1の粘着性フィルムは研削後の半導体ウエハの反り量が大きく、研削後の半導体ウエハの反りを抑制できないことが理解できる。また、ウエハのバンプ径よりも70μm大きなバンプ吸収径が観察された。すなわち、比較例の粘着性フィルムは、実施例の粘着性フィルムよりも凹凸吸収性に劣っていることが理解できる。
Claims (10)
- 電子部品を加工するために用いられる粘着性フィルムであって、
基材層と、凹凸吸収性樹脂層と、粘着性樹脂層と、をこの順番に備え、
前記凹凸吸収性樹脂層は、熱可塑性樹脂を含み、
示差走査熱量計(DSC)により測定される、前記凹凸吸収性樹脂層の融点(Tm)が10℃以上50℃以下の範囲内にあり、
前記電子部品は回路形成面を有し、前記電子部品の厚みが250μm以下になるように、前記電子部品の当該回路形成面とは反対側の面を研削するために用いられる粘着性フィルム。 - 請求項1に記載の粘着性フィルムにおいて、
動的粘弾性測定装置(ねじりモード)により測定される、70℃での前記凹凸吸収性樹脂層の貯蔵弾性率G’が1.0×104Pa以上1.0×106Pa以下である粘着性フィルム。 - 請求項1または2に記載の粘着性フィルムにおいて、
150℃で30分間熱処理したときの前記基材層の熱収縮率が0.05%以上1.2%以下である粘着性フィルム。 - 請求項1乃至3のいずれか一項に記載の粘着性フィルムにおいて、
前記熱可塑性樹脂はエチレン・α-オレフィン共重合体を含む粘着性フィルム。 - 請求項4に記載の粘着性フィルムにおいて、
前記熱可塑性樹脂はエチレン・極性モノマー共重合体をさらに含む粘着性フィルム。 - 請求項5に記載の粘着性フィルムにおいて、
前記エチレン・極性モノマー共重合体がエチレン・酢酸ビニル共重合体を含む粘着性フィルム。 - 請求項5または6に記載の粘着性フィルムにおいて、
前記凹凸吸収性樹脂層に含まれる前記エチレン・α-オレフィン共重合体および前記エチレン・極性モノマー共重合体の合計量を100質量部としたとき、
前記凹凸吸収性樹脂層中の前記エチレン・極性モノマー共重合体の含有量が10質量部以上70質量部以下である粘着性フィルム。 - 請求項1乃至7のいずれか一項に記載の粘着性フィルムにおいて、
前記電子部品は前記回路形成面にバンプ電極を有する粘着性フィルム。 - 回路形成面を有する電子部品と、前記電子部品の前記回路形成面側に貼り合わされ、かつ、請求項1乃至8のいずれか一項に記載の粘着性フィルムと、を備える構造体を準備する準備工程と、
前記電子部品の前記回路形成面側とは反対側の面を研削する研削工程と、
を少なくとも備える電子装置の製造方法。 - 請求項9に記載の電子装置の製造方法において、
前記研削工程では、前記電子部品の厚みが250μm以下になるまで前記電子部品の前記回路形成面側とは反対側の面の研削をおこなう電子装置の製造方法。
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| CN201980026791.6A CN112004899B (zh) | 2018-04-24 | 2019-04-18 | 粘着性膜及电子装置的制造方法 |
| JP2020516281A JP7252945B2 (ja) | 2018-04-24 | 2019-04-18 | 粘着性フィルムおよび電子装置の製造方法 |
| KR1020207029394A KR102498684B1 (ko) | 2018-04-24 | 2019-04-18 | 점착성 필름 및 전자 장치의 제조 방법 |
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| JPWO2023068088A1 (ja) * | 2021-10-20 | 2023-04-27 | ||
| WO2025203822A1 (ja) * | 2024-03-25 | 2025-10-02 | 三井化学Ictマテリア株式会社 | 電子装置の製造方法および粘着性フィルム |
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| EP4131348A4 (en) * | 2020-03-30 | 2024-05-01 | Mitsui Chemicals Tohcello, Inc. | METHOD FOR PRODUCING AN ELECTRONIC DEVICE |
| KR102757722B1 (ko) * | 2020-05-22 | 2025-01-21 | 미쓰이 가가쿠 토세로 가부시키가이샤 | 점착성 적층 필름 및 전자 장치의 제조 방법 |
| KR20220014812A (ko) | 2020-07-29 | 2022-02-07 | 가부시기가이샤 디스코 | 웨이퍼의 가공 방법, 보호 시트, 및 보호 시트 부설 방법 |
| US12557597B2 (en) | 2021-05-28 | 2026-02-17 | Mitsui Chemicals Ict Materia, Inc. | Back grinding adhesive film and method for manufacturing electronic device |
| KR20240005909A (ko) | 2021-05-28 | 2024-01-12 | 미쓰이 가가쿠 토세로 가부시키가이샤 | 백그라인드용 점착성 필름 및 전자 장치의 제조 방법 |
| KR102666524B1 (ko) * | 2023-05-19 | 2024-05-20 | 에이엠씨주식회사 | 신규한 웨이퍼 백그라인딩 테이프 |
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| Publication number | Publication date |
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| EP3786246A4 (en) | 2022-01-19 |
| EP3786246A1 (en) | 2021-03-03 |
| MY202838A (en) | 2024-05-24 |
| CN112004899A (zh) | 2020-11-27 |
| TWI821278B (zh) | 2023-11-11 |
| JP7252945B2 (ja) | 2023-04-05 |
| KR102498684B1 (ko) | 2023-02-09 |
| CN112004899B (zh) | 2023-01-10 |
| JPWO2019208378A1 (ja) | 2021-03-11 |
| KR20200130424A (ko) | 2020-11-18 |
| TW201945493A (zh) | 2019-12-01 |
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