WO2022131305A1 - 転写用両面粘着シート - Google Patents
転写用両面粘着シート Download PDFInfo
- Publication number
- WO2022131305A1 WO2022131305A1 PCT/JP2021/046349 JP2021046349W WO2022131305A1 WO 2022131305 A1 WO2022131305 A1 WO 2022131305A1 JP 2021046349 W JP2021046349 W JP 2021046349W WO 2022131305 A1 WO2022131305 A1 WO 2022131305A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- adhesive layer
- double
- transfer
- Prior art date
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- 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
- 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
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
-
- 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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
Definitions
- the present invention relates to a double-sided adhesive sheet for transfer. More specifically, the present invention relates to a double-sided pressure-sensitive adhesive sheet for transfer, which can be suitably used for transfer of fine electronic components such as semiconductor chips.
- a semiconductor wafer is individually prepared by dicing while temporarily fixed on a dicing tape, and the individualized semiconductor chip is pushed by a pin member from the dicing tape side on the back surface of the wafer to collet. It is picked up by a suction jig called, and mounted on a mounting board such as a circuit board (for example, Patent Document 1).
- the present invention has been made in view of the above problems, and an object thereof is double-sided adhesive transfer for transfer, which is suitable for efficiently mounting on a mounting substrate without damaging minute electronic components such as semiconductor chips. To provide a sheet.
- the present inventors have formed a first adhesive layer for receiving fine electronic components such as semiconductor chips with a low adhesive adhesive layer, and temporarily fixed the first adhesive layer to a carrier substrate.
- the double-sided pressure-sensitive adhesive sheet in which the second pressure-sensitive adhesive layer is composed of a peelable pressure-sensitive adhesive layer it can be efficiently mounted on a mounting substrate without damaging minute electronic components such as semiconductor chips. I found that.
- the present invention has been completed based on these findings.
- the first aspect of the present invention provides a double-sided pressure-sensitive adhesive sheet for transfer in which a first pressure-sensitive adhesive layer, a base material, and a second pressure-sensitive adhesive layer are laminated in this order.
- the double-sided adhesive sheet for transfer on the first side surface of the present invention is described above, instead of being individually picked up by a collet or the like when mounting a fine and thin electronic component such as a semiconductor chip on a mounting board such as a circuit board. 1
- the pressure-sensitive adhesive layer receives the electronic components.
- the electronic components received by the first pressure-sensitive adhesive layer can be mounted by collectively transferring them to a large-area mounting substrate, so that the manufacturing efficiency is significantly improved. Can be improved.
- the second pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for temporarily fixing the transfer double-sided pressure-sensitive adhesive sheet on the first side surface of the present invention to a substrate (carrier substrate) as a base.
- the first adhesive layer is an adhesive layer for receiving and holding electronic components, and is composed of a low adhesive adhesive layer. Is preferable.
- the configuration in which the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer is preferable in that the force applied to the electronic component when it is received can be reduced and damage to the electronic component can be suppressed.
- the electronic component is received by the first pressure-sensitive adhesive layer in a non-contact manner, for example, the electronic component is peeled off from the dicing tape by pushing it with a pin member and dropped onto the first pressure-sensitive adhesive layer.
- the first pressure-sensitive adhesive layer receives the dropped electronic component, it may bounce and cannot be received accurately.
- the configuration in which the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer is such that when the first pressure-sensitive adhesive layer receives an electronic component in a non-contact manner, the electronic component does not bounce and is easily caught by the first pressure-sensitive adhesive layer. It is also preferable in that it can be received with high positional accuracy. Further, it is also preferable that the electronic component received by the transfer double-sided pressure-sensitive adhesive sheet on the first side surface of the present invention can be easily peeled off from the first pressure-sensitive adhesive layer when the electronic component is mounted on the mounting substrate.
- the second pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for temporarily fixing to a carrier substrate, and is composed of a peelable pressure-sensitive adhesive layer. Is preferable.
- the configuration in which the second pressure-sensitive adhesive layer is composed of a peelable pressure-sensitive adhesive layer is preferable in that the second pressure-sensitive adhesive layer can be peeled off from the carrier substrate without contamination such as adhesive residue, and reworkability can be improved.
- the storage elastic modulus of the first pressure-sensitive adhesive layer at a frequency of 1 Hz and 25 ° C. by AFM-DMA (hereinafter referred to as “E'1a” in the present specification). (Sometimes referred to as) is preferably 50 MPa or less. This configuration is preferable in order to reliably bond the electronic components received by the first pressure-sensitive adhesive layer. If the E'1a is too high, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer is lowered, and problems such as misalignment and dropping of the electronic component may occur.
- E'1a is preferably 40 MPa or less, more preferably 30 MPa or less. Further, it may be 20 MPa or less and 10 MPa or less.
- E'1a is preferably 0.1 MPa or more. If the E'1a is too low, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer becomes too high, and the transferability at the time of mounting on the mounting substrate may be impaired. From the viewpoint of transferability of electronic components to a mounting substrate, E'1a is preferably 0.2 MPa or more, more preferably 0.5 MPa or more.
- the storage elastic modulus of the first pressure-sensitive adhesive layer at a frequency of 1 kHz and 25 ° C. by AFM-DMA (hereinafter referred to as “E'1b” in the present specification). (Sometimes referred to as) is preferably 100 MPa or less.
- This configuration is preferable in that when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is not repelled on the surface of the first pressure-sensitive adhesive layer and can be received with high positional accuracy.
- E'1b is preferably 90 MPa or less, more preferably 80 MPa or less. Further, it may be 70 MPa or less, 60 MPa or less, 50 MPa or less, 40 MPa or less, 30 MPa or less, and particularly 20 MPa or less. On the other hand, from the viewpoint of transferability from the first pressure-sensitive adhesive layer to the circuit board, E'1b is preferably 0.5 MPa or more.
- E'1b is too low, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer becomes high, and when the electronic component falls, it is buried in the first pressure-sensitive adhesive layer and mounted on a mounting substrate. The transferability may be impaired. From the viewpoint of transferability of electronic components to a mounting substrate, E'1b is preferably 0.7 MPa or more, more preferably 1 MPa or more.
- the AFM of the first pressure-sensitive adhesive layer with respect to the storage elastic modulus (E'1a) at a frequency of 1 Hz and 25 ° C. by AFM-DMA of the first pressure-sensitive adhesive layer is preferable that the ratio (E'1b / E'1a) of the storage elastic modulus (E'1b) at a frequency of 1 kHz and 25 ° C. by DMA is larger than 1.
- This configuration is preferable in that the balance between the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer, the position accuracy, the transferability to the mounting substrate, and the like is improved.
- E'1b / E'1a is preferably 1.05 or more, and more preferably 1.1 or more, from the viewpoint of the balance of adhesiveness of electronic components, position accuracy, transferability to a mounting substrate, and the like.
- the upper limit of E'1b / E'1a is not particularly limited, but is preferably 3 or less from the viewpoint of the above balance.
- the loss elastic modulus at a frequency of 1 Hz and 25 ° C. by AFM-DMA of the first adhesive layer (hereinafter referred to as “E” 1a ”in the present specification. (Sometimes referred to as) is preferably 7 MPa or less.
- E “1a” is preferably 5 MPa or less, more preferably 3 MPa or less.
- E "1a is too low, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer is lowered, which may cause problems such as misalignment or dropping of the electronic component. Electrons to the first pressure-sensitive adhesive layer. From the viewpoint of adhesiveness of parts, E “1a is preferably 0.01 MPa or more, more preferably 0.03 MPa or more.
- the tack force of the first adhesive layer on the stainless steel plate is 10 to 250 gf / ⁇ 5 mm SUS.
- the base material contains a heat-resistant resin.
- This configuration prevents transfer defects due to thermal expansion of the base material when the electronic components received by the double-sided adhesive sheet for transfer on the first side surface of the present invention are transferred onto the mounting substrate by thermocompression bonding and mounted. It is preferable in that it can be done.
- the heat-resistant resin is not particularly limited, but polyimide (PI), polyethylene naphthalate (PEN), polyamide (PA), polyetheretherketone (PEEK) and the like are preferable.
- the second aspect of the present invention provides a method for mounting an electronic component on a mounting board.
- the method of the second aspect of the present invention includes a step (first step) of receiving the diced electronic component by the first pressure-sensitive adhesive layer of the double-sided adhesive sheet for transfer of the first aspect of the present invention.
- the first step since the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer, it is preferable in that the force applied to the electronic component can be reduced and damage to the electronic component can be suppressed.
- the electronic component is received by the first pressure-sensitive adhesive layer in a non-contact manner, the electronic component is not bounced and is easily caught by the first pressure-sensitive adhesive layer, which is also preferable in that the electronic component can be received with high positional accuracy.
- the method of the second aspect of the present invention includes a step (second step) of transferring the electronic component received by the first pressure-sensitive adhesive layer to the mounting substrate.
- the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer, the electronic component can be easily peeled off from the first pressure-sensitive adhesive layer when the electronic component is transferred to the mounting substrate. It is preferable in that.
- a semiconductor chip can be suitably used as an electronic component.
- a plurality of electronic components individualized by dicing can be collectively received by the first adhesive layer, and it is not necessary to pick them up individually, and further, the first adhesive is not required. Since the electronic components received by the agent layer can be mounted by collectively transferring them to a circuit board having a large area, the manufacturing efficiency can be significantly improved.
- the first pressure-sensitive adhesive layer is preferably composed of a low-stickiness pressure-sensitive adhesive layer, it is preferable in that the force applied to the electronic parts can be reduced and damage to the electronic parts can be suppressed. Further, when the electronic component is received by the first pressure-sensitive adhesive layer in a non-contact manner, the electronic component is not bounced and is easily caught by the first pressure-sensitive adhesive layer, which is also preferable in that the electronic component can be received with high positional accuracy. Further, since the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer, it is preferable in that the electronic parts can be easily peeled off from the first pressure-sensitive adhesive layer when the electronic parts are transferred to the mounting substrate.
- the second pressure-sensitive adhesive layer is preferably composed of a peelable pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer is not contaminated with adhesive residue from the carrier substrate. It is preferable in that it can be peeled off and the reworkability can be improved.
- the double-sided adhesive sheet for transfer of the present invention on the mounting board of the electronic component, the electronic component can be mounted on the mounting board accurately and efficiently.
- FIG. 3 is a schematic cross-sectional view showing an embodiment of the first step in a method of mounting an electronic component on a mounting substrate using the double-sided adhesive sheet for transfer shown in FIG. 1.
- FIG. 3 is a schematic cross-sectional view showing an embodiment of a second step in a method of mounting an electronic component on a mounting substrate using the double-sided adhesive sheet for transfer shown in FIG. 1.
- the double-sided pressure-sensitive adhesive sheet for transfer of the present invention has a laminated structure in which a first pressure-sensitive adhesive layer, a base material, and a second pressure-sensitive adhesive layer are laminated in this order.
- An embodiment of the double-sided adhesive sheet for transfer of the present invention may be described below with reference to the drawings, but the double-sided adhesive sheet for transfer of the present invention is not limited to the embodiment.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of the double-sided adhesive sheet for transfer of the present invention, in which 1 is a double-sided adhesive sheet for transfer, 10 is a base material, 11 is a first adhesive layer, and 12 is a second adhesive. Shows the agent layer.
- the transfer double-sided pressure-sensitive adhesive sheet 1 has a laminated structure in which a first pressure-sensitive adhesive layer 11, a base material 10, and a second pressure-sensitive adhesive layer 12 are laminated in this order, and has a semiconductor chip or the like.
- the first adhesive layer 11 receives the electronic component.
- the double-sided adhesive sheet 1 for transfer for mounting electronic components, it becomes possible for the first adhesive layer 11 to collectively receive a plurality of electronic components that have been separated by dying, and it is necessary to pick them up individually. Further, the electronic components received by the first pressure-sensitive adhesive layer 11 can be mounted by collectively transferring them to a large-area mounting substrate, so that the manufacturing efficiency can be significantly improved.
- the first pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for receiving and holding electronic components, and is preferably composed of a low-stickiness pressure-sensitive adhesive layer.
- the configuration in which the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer is preferable in that the force applied to the electronic component when it is received can be reduced and damage to the electronic component can be suppressed.
- the electronic component is peeled off from the dicing tape by pushing it with a pin member and dropped onto the first pressure-sensitive adhesive layer.
- the configuration in which the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer is such that when the first pressure-sensitive adhesive layer receives an electronic component in a non-contact manner, the electronic component does not bounce and is easily caught by the first pressure-sensitive adhesive layer. It is also preferable in that it can be received with high positional accuracy. Further, it is also preferable that the electronic component received by the double-sided adhesive sheet for transfer can be easily peeled off from the first pressure-sensitive adhesive layer when the electronic component is mounted on the mounting substrate.
- the first pressure-sensitive adhesive layer has low adhesive pressure by adjusting the type and composition of the constituent pressure-sensitive adhesive, the degree of cross-linking, etc., and by forming WBL (Week Boundary Layer) by blending a light peeling agent and a plasticizer. It can be an agent layer.
- WBL Wide Boundary Layer
- the 180 ° peeling adhesive force of the first pressure-sensitive adhesive layer on the PET film at 25 ° C. is not particularly limited, but it can be received with high positional accuracy without damaging the electronic components, and further good transfer to the mounting substrate. From the viewpoint of properties, it is preferably 100 mN / 25 mm or less, more preferably 50 mN / 25 mm or less, and further preferably 10 mN / 25 mm or less. Further, from the viewpoint of the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer, the 180 ° peeling adhesive strength of the first pressure-sensitive adhesive layer to the PET film at 25 ° C. is preferably 0.1 mN / 25 mm or more. More preferably, it is 1 mN / 25 mm or more.
- the double-sided adhesive sheet for transfer is held at 160 ° C. for 5 minutes against the 180 ° peeling adhesive force (hereinafter, may be referred to as “P1a” in the present specification) of the first pressure-sensitive adhesive layer against the PET film at 25 ° C.
- P1a 180 ° peeling adhesive force
- P1b the 180 ° peeling adhesive force
- the ratio (P1b / P1a) of the 180 ° peeling adhesive force (hereinafter, may be referred to as “P1b” in the present specification) to the PET film of the first pressure-sensitive adhesive layer at 25 ° C. is particularly limited. However, 3 or less is preferable, and 2.5 or less is more preferable.
- P1b / P1a is 3 or less is a first adhesive layer for electronic components when the electronic component received by the double-sided adhesive sheet for transfer of the present invention is transferred onto a mounting substrate by thermocompression bonding and mounted. It is preferable in that the adhesive strength of the material does not increase and it can be peeled off satisfactorily and transferred to the mounting substrate.
- the 180 ° peeling adhesive strength at 25 ° C. is that the second adhesive layer of the double-sided adhesive sheet for transfer is attached to a glass plate, and the PET film is attached to the adhesive surface of the first adhesive layer, 2 kg roller, 1 It is crimped under reciprocating crimping conditions and aged for 30 minutes in an atmosphere of 23 ° C. and 50% RH. After aging, in accordance with JIS Z 0237, the transfer double-sided adhesive sheet is peeled off from the adherend under the conditions of 25 ° C, 50% RH, tensile speed of 300 mm / min, and peeling angle of 180 °, and 180 °. The peeling adhesive strength (mN / 25 mm) is measured.
- the PET film is not particularly limited as long as it is untreated PET, and examples thereof include the trade name “Lumirror # 25-S10 thickness 23 ⁇ m” (manufactured by Toray Industries, Inc.).
- the adhesive strength of the first pressure-sensitive adhesive layer is determined by adjusting the type and composition of the constituent pressure-sensitive adhesive, the degree of cross-linking, and the like, and by forming WBL (Week Boundary Layer) by blending a light peeling agent and a plasticizer. Can be adjusted.
- the storage elastic modulus (E'1a) of the first pressure-sensitive adhesive layer at a frequency of 1 Hz and 25 ° C. by AFM-DMA is preferably 50 MPa or less. This configuration is preferable in order to reliably bond the electronic components received by the first pressure-sensitive adhesive layer. If the E'1a is too high, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer is lowered, and problems such as misalignment and dropping of the electronic component may occur. From the viewpoint of the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer, E'1a is preferably 40 MPa or less, more preferably 30 MPa or less.
- E'1a is preferably 0.1 MPa or more. If the E'1a is too low, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer becomes too high, and the transferability at the time of mounting on the mounting substrate may be impaired. From the viewpoint of transferability of electronic components to a mounting substrate, E'1a is preferably 0.2 MPa or more, more preferably 0.5 MPa or more.
- the storage elastic modulus (E'1b) of the first pressure-sensitive adhesive layer at a frequency of 1 kHz and 25 ° C. by AFM-DMA is preferably 100 MPa or less.
- This configuration is preferable in that when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is not repelled on the surface of the first pressure-sensitive adhesive layer and can be received with high positional accuracy. If the E'1b is too high, when the electronic component is dropped and received without contacting the surface of the first pressure-sensitive adhesive layer, the electronic component is flipped and deviates from a predetermined position or is turned over, resulting in position accuracy. Is likely to decrease.
- E'1b is preferably 90 MPa or less, more preferably 80 MPa or less. Further, it may be 70 MPa or less, 60 MPa or less, 50 MPa or less, 40 MPa or less, 30 MPa or less, and particularly 20 MPa or less.
- E'1b is preferably 0.5 MPa or more. If the E'1b is too low, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer becomes high, and when the electronic component falls, it is buried in the first pressure-sensitive adhesive layer and mounted on a mounting substrate. The transferability may be impaired. From the viewpoint of transferability of electronic components to a mounting substrate, E'1b is preferably 0.7 MPa or more, more preferably 1 MPa or more.
- the frequency of the first pressure-sensitive adhesive layer by AFM-DMA is 1 Hz
- the frequency of the first pressure-sensitive adhesive layer by AFM-DMA is 1 kHz with respect to the storage elastic modulus (E'1a) at 25 ° C.
- the ratio (E'1b / E'1a) of the storage elastic modulus (E'1b) at 25 ° C. is preferably larger than 1. This configuration is preferable in that the balance between the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer, the position accuracy, the transferability to the mounting substrate, and the like is improved.
- E'1b / E'1a is preferably 1.05 or more, and more preferably 1.1 or more, from the viewpoint of the balance of adhesiveness of electronic components, position accuracy, transferability to a mounting substrate, and the like.
- the upper limit of E'1b / E'1a is not particularly limited, but is preferably 3 or less from the viewpoint of the above balance.
- the loss elastic modulus (E "1a) of the first pressure-sensitive adhesive layer at a frequency of 1 Hz and 25 ° C. by AFM-DMA is preferably 7 MPa or less. It is preferable from the viewpoint of excellent transferability of the component to the mounting substrate. If E “1a is too high, the adhesiveness of the electronic component to the first pressure-sensitive adhesive layer becomes too high, and transfer when mounting the component on the mounting substrate. Sex may be impaired. From the viewpoint of transferability of the electronic component to the mounting substrate, E "1a is preferably 5 MPa or less, more preferably 3 MPa or less.
- E "1a is preferably 0.01 MPa or more, more preferably 0.03 MPa or more.
- AFM-DMA Atomic Force Microscope (AFM) dynamic viscoelastic analysis (nDMA: nano Dynamic Mechanical Analysis)
- nDMA nano Dynamic Mechanical Analysis
- the tack force of the first pressure-sensitive adhesive layer on the stainless steel plate is 10 to 250 gf / ⁇ 5 mm SUS.
- the tack force of the first pressure-sensitive adhesive layer on a stainless steel plate can be adjusted by the type and composition of the constituent pressure-sensitive adhesive, the degree of cross-linking, additives such as fatty acid ester and fluorine-based surfactant, and the like.
- the surface force of the first pressure-sensitive adhesive layer is preferably ⁇ 500 to ⁇ 100 ⁇ N.
- the surface force of the first pressure-sensitive adhesive layer can be adjusted by the type and composition of the constituent pressure-sensitive adhesive, the degree of cross-linking, additives such as fatty acid ester and fluorine-based surfactant, and the like.
- the arithmetic mean roughness Ra of the first pressure-sensitive adhesive layer is preferably 2 nm or less.
- the configuration in which the arithmetic mean roughness Ra is 2 nm or less is such that when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing, and the position accuracy is high. It is preferable in that it can be received.
- the arithmetic mean roughness Ra is preferably 1.8 nm or less, more preferably 1.5 nm or less, in that the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing and can be received with high positional accuracy.
- the lower limit of the arithmetic mean roughness Ra is not particularly limited, but is preferably 0.1 nm or more, and even 0.2 nm or more, or 0.3 nm or more, from the viewpoint of transferability of electronic components to a mounting substrate. good.
- ) of the ratio of the surface force ( ⁇ N) to the arithmetic average roughness Ra (nm) of the first pressure-sensitive adhesive layer is. 200 or more is preferable.
- the absolute value of the ratio is 200 or more, when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing and is received with high positional accuracy. It is preferable in that it can be used.
- the absolute value of the ratio is preferably 225 or more, more preferably 250 or more, or 275 or more, or 300 or more, in that the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing and can be received with high positional accuracy. May be.
- the upper limit of the absolute value of the ratio is not particularly limited, but is preferably 550 or less, and may be 525 or less, or 500 or less, from the viewpoint of transferability of the electronic component to the mounting substrate.
- the ten-point average roughness Rz of the first pressure-sensitive adhesive layer is preferably 15 nm or less.
- the configuration in which the ten-point average roughness Rz is 15 nm or less is such that when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing, and the position accuracy is correct. It is suitable because it can be received well.
- the ten-point average roughness Rz is preferably 7 nm or less, more preferably 6.8 nm or less, and more preferably 6. It may be 5 nm or less, 5.5 nm or less, or 5 nm or less.
- the lower limit of the ten-point average roughness Rz is not particularly limited, but is preferably 1 nm or more, and may be 2 nm or more, or 3 nm or more from the viewpoint of transferability of electronic components to a mounting substrate.
- the root mean square roughness Rms of the first pressure-sensitive adhesive layer is preferably 3 nm or less.
- the configuration in which the root mean square roughness Rms is 3 nm or less is such that when the first pressure-sensitive adhesive layer receives the electronic component in a non-contact manner, the electronic component is easily caught by the first pressure-sensitive adhesive layer without bouncing, and the position accuracy is correct. It is suitable because it can be received well.
- the root mean square roughness Rms is preferably 1.5 nm or less, more preferably 1.4 nm or less, in that the electronic components are easily caught by the first pressure-sensitive adhesive layer without bouncing and can be received with high positional accuracy.
- the lower limit of the root mean square roughness Rms is not particularly limited, but is preferably 0.3 nm or more, preferably 0.4 nm or more, or 0.5 nm or more from the viewpoint of transferability of electronic components to the mounting substrate. May be good.
- the surface force, arithmetic average roughness Ra, ten-point average roughness Rz, and root mean square roughness Rms of the first pressure-sensitive adhesive layer can be measured by the method described in Examples below.
- the arithmetic average roughness Ra, the ratio of the surface force to the arithmetic average roughness Ra, the arithmetic average roughness Ra, the ten-point average roughness Rz, and the root mean square roughness Rms of the first adhesive layer are the constituent adhesives. It can be adjusted by the type and composition of the above, the degree of cross-linking, additives such as fatty acid ester and fluorine-based surfactant, and the like.
- the thickness of the first pressure-sensitive adhesive layer is not particularly limited, but is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more. When the thickness is at least a certain level, it is preferable that the first pressure-sensitive adhesive layer makes it easier for electronic components to receive the electronic components with high accuracy.
- the upper limit of the thickness of the first pressure-sensitive adhesive layer is not particularly limited, but is preferably 100 ⁇ m or less, and more preferably 75 ⁇ m or less. When the thickness is not more than a certain level, it becomes easy to transfer the electronic component to the mounting substrate with high accuracy, which is preferable.
- the haze of the first pressure-sensitive adhesive layer is not particularly limited, but is preferably 10% or less, more preferably 5.0% or less. When the haze is 10% or less, excellent transparency can be obtained.
- the pattern attached on the carrier substrate for example, the transfer position of the electronic component
- the indicator can be visually recognized, which is preferable.
- a first pressure-sensitive adhesive layer is formed on a separator and allowed to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, then the separator is peeled off and a slide glass (for example, total light beam) is used.
- a haze meter manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150" as a sample, which is attached to a sample with a transmittance of 91.8% and a haze of 0.4%. Can be done.
- the total light transmittance (according to JIS K7361-1) in the visible light wavelength region of the first pressure-sensitive adhesive layer is not particularly limited, but is preferably 85% or more, more preferably 88. % Or more.
- the total light transmittance is 85% or more, excellent transparency is obtained.
- a pattern for example, of an electronic component
- a marker indicating the transfer position can be visually recognized, which is preferable.
- the separator For the total light transmittance, for example, after forming the first pressure-sensitive adhesive layer on the separator and allowing it to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, the separator is peeled off and a slide glass (for example, for example) is obtained. , Total light transmittance 91.8%, haze 0.4%) as a sample, using a haze meter (manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150”) Can be measured.
- the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer is not particularly limited, and for example, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, an acrylic-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive. , Epoxy adhesives, vinyl alkyl ether adhesives, fluorine adhesives and the like.
- silicone-based adhesives and urethanes which can be received with high position accuracy without damaging electronic parts and are easy to control with low adhesiveness and low tackiness from the viewpoint of good transferability to the mounting substrate.
- Based adhesives and acrylic adhesives are preferable, silicone adhesives and urethane adhesives are more preferable, and silicone adhesives are even more preferable.
- the silicone-based pressure-sensitive adhesive is not particularly limited, and known or commonly used silicone-based pressure-sensitive adhesives can be used. Agents and the like can be used.
- the silicone-based adhesive may be either a one-component type or a two-component type.
- the silicone-based adhesive may be used alone or in combination of two or more.
- the addition type silicone-based pressure-sensitive adhesive is an addition reaction of an organopolysiloxane having an alkenyl group such as a vinyl group on a silicon atom and an organopolysiloxane having a hydrosilyl group using a platinum compound catalyst such as platinum chloride acid. It is a pressure-sensitive adhesive that produces a silicone-based polymer by subjecting it to a hydrosilylation reaction.
- the peroxide-curable silicone-based pressure-sensitive adhesive is generally a pressure-sensitive adhesive that cures (crosslinks) an organopolysiloxane with a peroxide to produce a silicone-based polymer.
- the condensed silicone-based pressure-sensitive adhesive is generally a pressure-sensitive adhesive that produces a silicone-based polymer by dehydration or dealcoholization reaction between polyorganosiloxanes having a hydrolyzable silyl group such as a silanol group or an alkoxysilyl group at the terminal. ..
- silicone-based pressure-sensitive adhesive examples include a silicone-based pressure-sensitive adhesive composition containing a silicone rubber and a silicone resin because it is easy to control low tackiness and low tackiness.
- the silicone rubber is not particularly limited as long as it is a silicone-based rubber component, but for example, organopolysiloxane having dimethylsiloxane, methylphenylsiloxane, or the like as a main constituent unit can be used. Further, depending on the type of reaction, a silicone-based rubber having an alkenyl group bonded to a silicon atom (alkenyl group-containing organopolysiloxane; in the case of an addition reaction type) and a silicone-based rubber having at least a methyl group (peroxide curable type).
- a silicone-based rubber having a silanol group or a hydrolyzable alkoxysilyl group at the terminal in the case of a condensation type or the like can be used.
- the weight average molecular weight of the organopolysiloxane in the silicone rubber is usually 150,000 or more, preferably 280,000 to 1,000,000, and particularly preferably 500,000 to 900,000.
- the silicone resin is not particularly limited as long as it is a silicone-based resin used for a silicone-based pressure-sensitive adhesive, and for example, an M unit composed of the constituent unit "R 3 Si 1/2 " and the constituent unit "SiO". It consists of a (co) polymer having at least one unit selected from the Q unit consisting of " 2 ", the T unit consisting of the constituent unit "RSiO 3/2 ", and the D unit consisting of the constituent unit "R 2 SiO". Examples thereof include silicone resins made of organopolysiloxane.
- R in the said structural unit represents a hydrocarbon group or a hydroxyl group.
- hydrocarbon group examples include an aliphatic hydrocarbon group (an alkyl group such as a methyl group and an ethyl group), an alicyclic hydrocarbon group (a cycloalkyl group such as a cyclohexyl group), and an aromatic hydrocarbon group (such as a cycloalkyl group such as a cyclohexyl group).
- Eryl groups such as phenyl group and naphthyl group
- Various functional groups such as a vinyl group may be introduced into the organopolysiloxane in such a silicone resin, if necessary.
- the functional group to be introduced may be a functional group capable of causing a crosslinking reaction.
- the silicone resin an MQ resin composed of M units and Q units is preferable.
- the weight average molecular weight of the organopolysiloxane in the silicone resin is usually 1000 or more, preferably 1000 to 20000, and particularly preferably 1500 to 10000.
- the blending ratio of the silicone rubber and the silicone resin is not particularly limited, but from the viewpoint of easy control of low adhesiveness and low tackiness, for example, 100 to 220 parts by weight of the silicone resin is 100 parts by weight of the silicone rubber. (In particular, it is preferably 120 to 180 parts by weight).
- the silicone rubber and the silicone resin may be in a mixed state in which they are simply mixed, and react with each other to form a condensate (particularly a portion). It may be a condensate), a cross-linking reaction product, an addition reaction product, or the like.
- a silicone-based pressure-sensitive adhesive composition containing a silicone rubber and a silicone resin usually contains a cross-linking agent in order to form a cross-linked structure because it is easy to control low tackiness and low tackiness.
- the cross-linking agent is not particularly limited, but a siloxane-based cross-linking agent (silicone-based cross-linking agent) and a peroxide-based cross-linking agent can be preferably used.
- the cross-linking agent can be used alone or in combination of two or more.
- polyorganohydrogensiloxane having two or more hydrogen atoms bonded to silicon atoms in the molecule can be preferably used.
- various organic groups may be bonded to the silicon atom to which the hydrogen atom is bonded in addition to the hydrogen atom.
- the organic group include an alkyl group such as a methyl group and an ethyl group; an aryl group such as a phenyl group, and an alkyl halide group, but a methyl group is preferable from the viewpoint of synthesis and handling.
- the skeleton structure of the polyorganohydrogensiloxane may have any of linear, branched, and cyclic skeleton structures, but linear skeletons are preferable.
- peroxide-based cross-linking agent for example, diacyl peroxide, alkyl peroxy ester, peroxy dicarbonate, monoperoxy carbonate, peroxyketal, dialkyl peroxide, hydroperoxide, ketone peroxide and the like can be used. .. More specifically, for example, benzoyl peroxide, t-butylperoxybenzoate, dicumyl peroxide, t-butylcumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di.
- Examples of the additive silicone adhesive include the product name "KR-3700", the product name “KR-3701”, the product name “X-40-3237-1”, the product name “X-40-3240", and the product name. "X-40-3291-1” and the trade name “X-40-3306” (all manufactured by Shin-Etsu Chemical Co., Ltd.) are commercially available. Further, as the peroxide curing type silicone adhesive, for example, the product name "KR-100”, the product name “KR-101-10", the product name “KR-130” (all manufactured by Shin-Etsu Chemical Co., Ltd.) and the like are used. It is commercially available.
- the additive silicone-based pressure-sensitive adhesive composition preferably contains a curing catalyst such as a platinum catalyst.
- a curing catalyst such as a platinum catalyst.
- platinum catalysts for example, trade names "CAT-PL-50T” (manufactured by Shin-Etsu Chemical Co., Ltd.), "DOWNSIL NC-25 Catalyst” or “DOWNSIL SRX212 Catalyst” (manufactured by Dow Toray Co., Ltd.) are commercially available.
- the content of the curing catalyst is determined by the silicone-based polymer (silicone rubber, silicone) as the base polymer. About 0.1 to 10 parts by weight is preferable with respect to 100 parts by weight (including resin and the like).
- the urethane-based pressure-sensitive adhesive is not particularly limited, and a known or commonly used urethane-based pressure-sensitive adhesive can be used.
- a urethane-based pressure-sensitive adhesive composition containing is preferable.
- any suitable polyol can be adopted as long as it is a polyol having two or more hydroxyl groups.
- a polyol having two hydroxyl groups include a polyol having two hydroxyl groups (diol), a polyol having three hydroxyl groups (triol), a polyol having four hydroxyl groups (tetraol), and a polyol having five hydroxyl groups.
- penaol polyol having 6 hydroxyl groups (hexaol) and the like can be mentioned.
- the polyol only one kind may be used, or two or more kinds may be used.
- the polyol preferably contains a polyol having a number average molecular weight (Mn) of 400 to 20000.
- the content of the polyol having a number average molecular weight (Mn) of 400 to 20000 in the total amount of the polyol is preferably 50 to 100% by weight, more preferably 70 to 100% by weight, and further preferably 90 to 90 to 100% by weight. It is 100% by weight, particularly preferably 95 to 100% by weight, and most preferably substantially 100% by weight.
- a urethane-based pressure-sensitive adhesive controlled to have low adhesiveness and low tackiness is provided. be able to.
- polyol examples include polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, castor oil-based polyols, and the like.
- the polyester polyol can be obtained, for example, by an esterification reaction between a polyol component and an acid component.
- polyol component examples include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, and 2-butyl-2-ethyl-.
- Examples of the acid component include succinic acid, methylsuccinic acid, adipic acid, piceric acid, azelaic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, dimer acid, and 2-methyl-1. , 4-Cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 4,4'-biphereldicarboxylic acid Examples thereof include acids and their acid anhydrides.
- polyether polyol examples include water, low molecular weight polyols (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), dihydroxybenzene (catechol, resorcin, hydroquinone, etc.).
- polyether polyols obtained by addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide using the above as an initiator.
- alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide using the above as an initiator.
- Specific examples thereof include polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like.
- polycaprolactone polyol examples include caprolactone-based polyester diols obtained by ring-opening polymerization of cyclic ester monomers such as ⁇ -caprolactone and ⁇ -valerolactone.
- the polycarbonate polyol is, for example, a polycarbonate polyol obtained by subjecting the polyol component to a polycondensation reaction with phosgen; the polyol component and the polyol component, dimethyl carbonate, diethyl carbonate, diprovyl carbonate, diisopropyl carbonate, dibutyl carbonate, ethylbutyl carbonate, ethylene carbonate.
- Polycarbonate polyol Polycarbonate polyol; Polycarbonate polyol obtained by ester exchange reaction between the various polycarbonate polyols and a hydroxyl group-containing compound; Polycarbonate-based polycarbonate polyol obtained by a polycondensation reaction between the various polycarbonate polyols and a dicarboxylic acid compound; the various polycarbonates. Examples thereof include a copolymerized polyether polycarbonate polyol obtained by copolymerizing a polyol and an alkylene oxide.
- castor oil-based polyol examples include castor oil-based polyol obtained by reacting castor oil fatty acid with the polyol component. Specific examples thereof include castor oil-based polyols obtained by reacting castor oil fatty acid with polypropylene glycol.
- the polyol it is preferable to use a polyol (triol) having three hydroxyl groups as an essential component from the viewpoints of low adhesiveness, low tackiness, wettability, etc. of the first pressure-sensitive adhesive layer to electronic components.
- the polyol (triol) having three hydroxyl groups is preferably contained in an amount of 50 to 100% by weight, more preferably 70 to 100% by weight, based on the total amount of the components constituting the polyol.
- polyfunctional isocyanate-based compound examples include an aliphatic polyisocyanate, an alicyclic polyisocyanate, and an aromatic polyisocyanate compound.
- aliphatic polyisocyanate examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylenediocyanate, dodecamethylene diisocyanate, 2,4,4-. Examples thereof include trimethylhexamethylene diisocyanate.
- Examples of the alicyclic polyisocyanate include 1,3-cyclopentenediisocyanate, 1,3-cyclohexanediisocyanate, 1,4-cyclohexanediisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, and hydrogenated tolylene diisocyanate.
- Examples thereof include isocyanate hydrogenated tetramethylxylylene diisocyanate.
- aromatic polyisocyanate examples include phenylenediocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2'-diphenylmethane diisocyanate, and 4,4'-diphenylmethane diisocyanate, 4 , 4'-toluene diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalenediocyanate, xylylene diisocyanate and the like.
- aliphatic polyisocyanates and modified products thereof are preferable.
- the cross-linked structure of the aliphatic polyisocyanate and its modified product is richer in flexibility than other isocyanate-based cross-linking agents, and it is easy to control low adhesiveness and low tackiness.
- hexamethylene diisocyanate and its modified product are particularly preferable.
- the polyfunctional isocyanate-based compound and the polyol are the isocyanate group of the polyfunctional isocyanate-based compound and the polyol from the viewpoint of low adhesiveness, low tackiness, and wettability to the electronic component of the first pressure-sensitive adhesive layer.
- the equivalent ratio (NCO / OH) of the hydroxyl groups is preferably 1 to 5, more preferably 1.1 to 3, and even more preferably 1.2 to 2.
- the urethane-based pressure-sensitive adhesive composition preferably contains a catalyst such as an iron-based compound and / or a tin-based compound.
- a catalyst such as an iron-based compound and / or a tin-based compound.
- tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonate) iron, tris (hexane-2,4-dionat) iron, and tris (heptane-2,4-dionat) iron.
- the content (usage amount) of the catalyst contained in the urethane-based pressure-sensitive adhesive composition is preferably 0.002 to 0.5 parts by weight, preferably 0.005 to 0.3 parts by weight, based on 100 parts by weight of the polyol. More preferably, 0.01 to 0.1 parts by weight is further preferable. Within this range, the rate of the crosslinking reaction is high when the pressure-sensitive adhesive layer is formed, and the pot life of the pressure-sensitive adhesive composition is long, which is a preferable embodiment.
- urethane-based pressure-sensitive adhesive a urethane-based pressure-sensitive adhesive composition containing a urethane prepolymer is also preferable because it is easy to control low adhesiveness and low tackiness.
- Examples of the urethane-based pressure-sensitive adhesive composition containing a urethane prepolymer include a pressure-sensitive adhesive composition containing a polyurethane polyol as a urethane prepolymer and a polyfunctional isocyanate-based compound.
- the urethane prepolymer may be only one kind or two or more kinds.
- the polyfunctional isocyanate compound may be only one kind or two or more kinds.
- the polyurethane polyol as a urethane prepolymer is preferably formed by reacting a polyester polyol and a polyether polyol with an organic polyisosianate compound in the presence of a catalyst or in the absence of a catalyst.
- any suitable polyester polyol can be used.
- a polyester polyol include a polyester polyol obtained by reacting an acid component with a glycol component.
- the acid component include terephthalic acid, adipic acid, azelaic acid, sebatic acid, phthalic anhydride, isophthalic acid, trimellitic acid and the like.
- the glycol component include ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, 1,6-hexane glycol, 3-methyl-1,5-pentanediol, 3,3'-dimethylol heptane, and polyoxyethylene glycol.
- polyester polyol examples include polyester polyols obtained by ring-opening polymerization of lactones such as polycaprolactone, poly ( ⁇ -methyl- ⁇ -valerolactone) and polyvalerolactone.
- the molecular weight of the polyester polyol can be from low molecular weight to high molecular weight.
- the number average molecular weight is preferably 500 to 5000. If the number average molecular weight is less than 500, the reactivity becomes high and gelation may easily occur. If the number average molecular weight exceeds 5000, the reactivity may be low, and the cohesive force of the polyurethane polyol itself may be low.
- the amount of the polyester polyol used is preferably 10 to 90 mol% in the polyol constituting the polyurethane polyol.
- any suitable polyether polyol can be used.
- a polyether polyol for example, a low molecular weight polyol such as water, propylene glycol, ethylene glycol, glycerin, or trimethylolpropane is used as an initiator, and an oxylan compound such as ethylene oxide, propylene oxide, butylene oxide, or tetrahydrofuran is used.
- an oxylan compound such as ethylene oxide, propylene oxide, butylene oxide, or tetrahydrofuran is used.
- examples thereof include polyether polyols obtained by polymerization.
- Specific examples of such a polyether polyol include a polyether polyol having two or more functional groups, such as polypropylene glycol, polyethylene glycol, and polytetramethylene glycol.
- the molecular weight of the polyether polyol can be from low molecular weight to high molecular weight.
- the number average molecular weight is preferably 1000 to 5000. If the number average molecular weight is less than 1000, the reactivity becomes high and gelation may occur easily. If the number average molecular weight exceeds 5000, the reactivity may be low, and the cohesive force of the polyurethane polyol itself may be low.
- the amount of the polyether polyol used is preferably 20 to 80 mol% in the polyol constituting the polyurethane polyol.
- polyether polyols are, if necessary, glycols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol, ethylenediamine, and N.
- glycols such as ethylene glycol, 1,4-butanediol, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol, ethylenediamine, and N.
- polyvalent amines such as aminoethylethanolamine, isophoronediamine, and xylylenediamine.
- the polyether polyol only a bifunctional polyether polyol may be used, or a polyether polyol having a number average molecular weight of 1000 to 5000 and having at least 3 or more hydroxyl groups in one molecule is used. Part or all may be used.
- a part or all of the polyether polyol having an average molecular weight of 1000 to 5000 and having at least 3 or more hydroxyl groups in one molecule is used as the polyether polyol, the balance between the adhesive strength and the removability becomes good. obtain.
- the number average molecular weight is less than 1000, the reactivity becomes high and gelation may easily occur.
- the number average molecular weight of such a polyether polyol is more preferably 2500 to 3500.
- organic polyisocyanate compound any suitable organic polyisocyanate compound can be used.
- organic polyisocyanate compound include aromatic polyisocyanates, aliphatic polyisocyanates, aromatic aliphatic polyisocyanates, and alicyclic polyisocyanates.
- aromatic polyisocyanate examples include 1,3-phenylenediocyanate, 4,4'-diphenyldiisocyanate, 1,4-phenylenediocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, and 2,6.
- aliphatic polyisocyanate examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 2,3-butylenediocyanate, 1,3-butylenediocyanate, and dodecamethylene diisocyanate. Examples thereof include 2,4,4-trimethylhexamethylene diisocyanate.
- aromatic aliphatic polyisocyanate examples include ⁇ , ⁇ '-diisocyanate-1,3-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4-dimethylbenzene, ⁇ , ⁇ '-diisocyanate-1,4-diethylbenzene. , 1,4-Tetramethylxylylene diisocyanate, 1,3-tetramethylxylylene diisocyanate and the like.
- Examples of the alicyclic polyisocyanate include 3-isocyanate methyl-3,5,5-trimethylcyclohexylisocyanate, 1,3-cyclopentanediisocyanate, 1,3-cyclohexanediisocyanate, 1,4-cyclohexanediisocyanate, and methyl-2. , 4-Cyclohexanediisocyanate, methyl-2,6-cyclohexanediisocyanate, 4,4'-methylenebis (cyclohexylisocyanate), 1,4-bis (isocyanatemethyl) cyclohexane, 1,4-bis (isocyanatemethyl) cyclohexane and the like. Be done.
- organic polyisocyanate compound a trimethylolpropane adduct body, a biuret body reacted with water, a trimer having an isocyanurate ring, or the like can also be used in combination.
- Any suitable catalyst can be used as the catalyst that can be used to obtain the polyurethane polyol.
- a catalyst include tertiary amine compounds and organometallic compounds.
- tertiary amine compound examples include triethylamine, triethylenediamine, 1,8-diazabicyclo (5,4,0) -undecene-7 (DBU) and the like.
- organometallic compound examples include tin-based compounds and non-tin-based compounds.
- tin-based compound examples include dibutyltin dichloride, dibutyltin oxide, dibutyltin dibromide, dibutyltin dimalate, dibutyltin dilaurate (DBTDL), dibutyltin diacetate, dibutyltin sulfide, tributyltin sulfide, tributyltin oxide, and tributyl.
- Examples thereof include tin acetate, triethyl tin ethoxide, tributyl tin ethoxide, dioctyl tin oxide, tributyl tin chloride, tributyl tin trichloroacetate, tin 2-ethylhexanoate and the like.
- non-tin compound examples include titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate, and butoxytitanium trichloride; lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate.
- titanium compounds such as dibutyl titanium dichloride, tetrabutyl titanate, and butoxytitanium trichloride
- lead compounds such as lead oleate, lead 2-ethylhexanoate, lead benzoate, and lead naphthenate.
- Iron-based compounds such as iron 2-ethylhexanoate and iron acetylacetonate
- Cobalt-based compounds such as cobalt benzoate and cobalt 2-ethylhexanoate
- Zinc-based compounds such as zinc naphthenate and zinc 2-ethylhexanoate
- Titanium-based compounds such as zirconium naphth
- Examples of the combination of such two types of catalysts include tertiary amine / organometallic, tin-based / non-tin-based, and tin-based / tin-based, preferably tin-based / tin-based, and more preferably.
- the tin 2-ethylhexanoate / dibutyltin dilaurate is preferably less than 1 and more preferably 0.2 to 0.6 by weight. When the compounding ratio is 1 or more, gelation may easily occur due to the balance of catalytic activity.
- the amount of the catalyst used is preferably 0.01 to 1.0% by weight with respect to the total amount of the polyester polyol, the polyether polyol, and the organic polyisosianate compound.
- the reaction temperature is preferably less than 100 ° C, more preferably 85 ° C to 95 ° C. If the temperature is 100 ° C. or higher, it may be difficult to control the reaction rate and the crosslinked structure, and it may be difficult to obtain a polyurethane polyol having a predetermined molecular weight.
- the reaction temperature is preferably 100 ° C. or higher, more preferably 110 ° C. or higher. Further, when the polyurethane polyol is obtained without a catalyst, it is preferable to react for 3 hours or more.
- a method for obtaining a polyurethane polyol for example, 1) a method of charging a polyester polyol, a polyether polyol, a catalyst, and an organic polyisocyanate into a flask in full quantity, and 2) a method of charging a polyester polyol, a polyether polyol, and a catalyst into a flask and organically polyisocianate. There is a method of adding the polyol by dropping it. As a method for obtaining a polyurethane polyol, the method 2) is preferable in controlling the reaction.
- Any suitable solvent can be used to obtain the polyurethane polyol.
- a solvent include methyl ethyl ketone, ethyl acetate, toluene, xylene, acetone and the like.
- toluene is preferable.
- the above-mentioned compound can be used.
- any method for producing a polyurethane-based composition obtained from a composition containing a urethane prepolymer any method is suitable as long as it is a method for producing a polyurethane-based resin composition using a so-called "urethane prepolymer" as a raw material.
- a manufacturing method can be adopted.
- the acrylic pressure-sensitive adhesive is not particularly limited, and a known or commonly used acrylic pressure-sensitive adhesive can be used.
- an acrylic polymer is contained as a base polymer because it is easy to control low adhesiveness and low tackiness. Examples thereof include acrylic pressure-sensitive adhesive compositions.
- the acrylic polymer is a polymer containing a structural unit derived from an acrylic monomer (a monomer component having a (meth) acryloyl group in the molecule) as a structural unit of the polymer.
- the acrylic polymer is preferably a polymer containing the largest amount of structural units derived from (meth) acrylic acid ester in terms of mass ratio.
- As the acrylic polymer only one kind may be used, or two or more kinds may be used.
- "(meth) acrylic” means "acrylic” and / or "methacrylic” (either one or both of "acrylic” and “methacrylic"), and the same applies to the others.
- Examples of the (meth) acrylic acid ester include hydrocarbon group-containing (meth) acrylic acid esters.
- Examples of the hydrocarbon group-containing (meth) acrylic acid ester include (meth) acrylic acid alkyl ester, (meth) acrylic acid cycloalkyl ester, and (meth) acrylic acid aryl ester.
- Examples of the (meth) acrylic acid alkyl ester include methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, s-butyl ester, t-butyl ester, and pentyl ester of (meth) acrylic acid.
- Examples of the (meth) acrylic acid cycloalkyl ester include cyclopentyl ester and cyclohexyl ester of (meth) acrylic acid.
- Examples of the (meth) acrylic acid aryl ester include phenyl ester and benzyl ester of (meth) acrylic acid.
- hydrocarbon group-containing (meth) acrylic acid ester only one kind may be used, or two or more kinds may be used.
- the proportion of the hydrocarbon group-containing (meth) acrylic acid ester in all the monomer components of the above is preferably 40% by mass or more, more preferably 60% by mass or more.
- the acrylic polymer is a structural unit derived from other monomer components copolymerizable with the hydrocarbon group-containing (meth) acrylic acid ester for the purpose of modifying cohesive force, heat resistance, adhesiveness, tackiness and the like. May include.
- the other monomer components include functional groups such as a carboxy group-containing monomer, an acid anhydride monomer, a hydroxy group-containing monomer, a glycidyl group-containing monomer, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, acrylamide, and acrylonitrile. Examples thereof include monomers and vinyl ester-based monomers.
- Examples of the carboxy group-containing monomer include acrylic acid, methacrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid.
- Examples of the acid anhydride monomer include maleic anhydride, itaconic anhydride and the like.
- Examples of the hydroxy group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate.
- Examples thereof include 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, and (4-hydroxymethylcyclohexyl) methyl (meth) acrylate.
- Examples of the glycidyl group-containing monomer include glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate.
- sulfonic acid group-containing monomer examples include styrene sulfonic acid, allyl sulfonic acid, 2- (meth) acrylamide-2-methyl propane sulfonic acid, (meth) acrylamide propane sulfonic acid, sulfopropyl (meth) acrylate, and (meth). ) Acryloyloxynaphthalene sulfonic acid and the like can be mentioned.
- phosphoric acid group-containing monomer examples include 2-hydroxyethylacryloyl phosphate and the like.
- Examples of the vinyl ester-based monomer include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, vinyl cyclohexanecarboxylic acid, and vinyl benzoate.
- the above-mentioned other monomer components only one kind may be used, or two or more kinds may be used.
- an acrylic polymer from the viewpoint that basic properties such as tackiness due to a hydrocarbon group-containing (meth) acrylic acid ester are appropriately expressed in the first pressure-sensitive adhesive layer, and low tackiness and low tackiness can be easily controlled.
- the total ratio of the other monomer components to all the monomer components is preferably 60% by mass or less, more preferably 40% by mass or less.
- the acrylic polymer may contain a structural unit derived from a polyfunctional monomer copolymerizable with the monomer component forming the acrylic polymer in order to form a crosslinked structure in the polymer skeleton.
- the polyfunctional monomer include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and penta.
- the proportion of the polyfunctional monomer in all the monomer components of the above is preferably 40% by mass or less, more preferably 30% by mass or less.
- Acrylic polymer is obtained by subjecting one or more monomer components including acrylic monomer to polymerization.
- the polymerization method include solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization and the like.
- the mass average molecular weight of the acrylic polymer is preferably 100,000 or more, more preferably 200,000 to 3 million.
- the mass average molecular weight is 100,000 or more, the amount of low molecular weight substances in the pressure-sensitive adhesive layer tends to be small, and contamination of electronic parts and the like can be further suppressed.
- the acrylic pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer may contain a cross-linking agent.
- the acrylic polymer can be crosslinked to further reduce the low molecular weight substances in the first pressure-sensitive adhesive layer.
- the mass average molecular weight of the acrylic polymer can be increased to control low adhesiveness and low tackiness.
- the cross-linking agent include polyisocyanate compounds, epoxy compounds, polyol compounds (polyphenol-based compounds and the like), aziridine compounds, melamine compounds and the like, and isocyanate-based cross-linking agents and / or epoxy-based cross-linking agents are preferable.
- the amount used is preferably about 10 parts by mass or less, more preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the acrylic polymer.
- Examples of the isocyanate-based cross-linking agent include aliphatic isocyanates, alicyclic isocyanates, and aromatic isocyanates.
- Examples of the aliphatic isocyanates include trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate, and dimerate diisocyanate.
- Examples of the alicyclic isocyanates include cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, and 1,3-bis (isocyanatomethyl) cyclohexane.
- aromatic isocyanates examples include 2,4-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate.
- isocyanate-based cross-linking agent examples include a trimethylolpropane adduct of tolylene diisocyanate (trade name "Coronate L", manufactured by Tosoh Corporation) and an isocyanulate of hexamethylene diisocyanate (trade name "Coronate HX", manufactured by Tosoh Corporation). ) Is also mentioned.
- epoxy-based cross-linking agent examples include N, N, N', N'-tetraglycidyl-m-xylene diamine, diglycidyl aniline, and 1,3-bis (N, N-diglycidylamino).
- the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer preferably contains a light peeling agent.
- WBL Strong Boundary Layer; weak boundary layer
- the light peeling agent is not particularly limited, and known light peeling agents can be used without limitation, and examples thereof include silicone-based peeling agents, fluorine-based surfactants, aliphatic esters, and the like. It can be used alone or in combination of two or more.
- the silicone-based release agent is not particularly limited, and examples thereof include a thermosetting silicone-based release agent and an ionizing radiation-curable silicone-based release agent. Further, the silicone-based release agent may be either a solvent-free type that does not contain a solvent or a solvent type that is dissolved or dispersed in an organic solvent. The silicone-based release agent can be used alone or in combination of two or more.
- thermosetting silicone-based release agent is not particularly limited, but preferably contains organohydrogenpolysiloxane and organopolysiloxane having an aliphatic unsaturated group. Further, the silicone-based release agent is preferably a heat-addition reaction curable silicone-based release agent that is cured by cross-linking due to a heat addition reaction.
- the heat-added reaction-curable silicone-based stripping agent is not particularly limited, but is a polysiloxane (Si—H group-containing polysiloxane) having a hydrogen atom (H) bonded to a silicon atom (Si) in the molecule, and a molecule.
- a polysiloxane (Si—H group reactive polysiloxane) containing a functional group (Si—H group reactive functional group) reactive with a Si—H bond (covalent bond between Si and H) is contained therein.
- the containing release agent is preferably mentioned.
- this release agent is cured by addition reaction of Si—H group and Si—H group reactive functional group and cross-linking.
- the Si to which H is bonded may be either Si in the main chain or Si in the side chain.
- the Si—H group-containing polysiloxane is preferably a polysiloxane containing two or more Si—H groups in the molecule.
- a dimethylhydrogensiloxane-based polymer such as poly (dimethylsiloxane-methylsiloxane) is preferably mentioned.
- the Si—H group-reactive polysiloxane the Si—H group-reactive functional group or the side chain containing such a functional group forms the main chain (skeleton) of the siloxane-based polymer (for example, the main chain).
- Preferred examples thereof include polysiloxane in an embodiment bonded to Si at the end and Si) inside the main chain.
- a polysiloxane in which a Si—H group-reactive functional group is directly bonded to Si in the main chain is preferable.
- a polysiloxane containing two or more Si—H group-reactive functional groups in the molecule is also preferable.
- Si—H group-reactive functional group in the Si—H group-reactive polysiloxane examples include alkenyl groups such as vinyl group and hexenyl group.
- Examples of the siloxane-based polymer forming the main chain portion of the Si—H group-reactive polysiloxane include polydialkylsiloxanes such as polydimethylsiloxane, polydiethylsiloxane, and polymethylethylsiloxane (the two alkyl groups are the same).
- Polyalkylarylsiloxane Poly (dimethylsiloxane-methylsiloxane), polymers obtained by polymerizing a plurality of Si-containing monomers, and the like. Among them, polydimethylsiloxane is preferable as the siloxane-based polymer forming the main chain portion.
- the heat-added reaction-curable silicone-based release agent contains a polysiloxane having two or more Si—H groups in the molecule and a polysiloxane containing two or more Si—H group-reactive functional groups in the molecule. It is preferably a heat-added reaction-curable silicone-based release agent contained therein.
- the ionizing radiation-curable silicone-based release agent is not particularly limited, but a UV-curable silicone-based release agent that cures by causing a cross-linking reaction by irradiation with ultraviolet rays (UV) is preferable.
- UV ultraviolet rays
- the UV curable silicone-based stripping agent is a stripping agent that cures by undergoing a chemical reaction such as cationic polymerization, radical polymerization, radical addition polymerization, or hydrosilylation reaction by UV irradiation.
- a UV-curable silicone-based release agent that is cured by cationic polymerization is particularly preferable.
- the cationically polymerized UV-curable silicone-based release agent is not particularly limited, but at least two epoxy groups form the main chain (skeleton) of the siloxane-based polymer (for example, Si at the end of the main chain, the main chain). Si) inside the chain and / or Si contained in the side chain, respectively, directly or via a divalent group (alkylene group such as methylene group or ethylene group; alkyleneoxy group such as ethyleneoxy group or propyleneoxy group).
- a release agent containing an epoxy group-containing polysiloxane bonded to the backbone is preferably used. The mode of bonding these at least two epoxy groups to Si may be the same or different.
- a release agent containing a polysiloxane containing two or more epoxy group-containing side chains of one or more types is preferable.
- the epoxy group-containing side chain include a glycidyl group, a glycidyloxy group (glycidyloxy group), a 3,4-epoxycyclohexyl group, a 2,3-epoxycyclopentyl group and the like.
- the epoxy group-containing polysiloxane may be linear, branched, or a mixture thereof.
- thermosetting silicone-based release agent in the silicone-based pressure-sensitive adhesive from the viewpoint that the first pressure-sensitive adhesive layer can be easily controlled to have low adhesiveness and low tackiness.
- the content of the silicone-based release agent is not particularly limited, but is 100 parts by weight of the silicone-based polymer as the base polymer. On the other hand, it is preferably 0.5 parts by weight or more and 100 parts by weight or less. When the content is 0.5 parts by weight or more, it becomes easy to obtain the effect that the first pressure-sensitive adhesive layer can be easily controlled to have low adhesiveness and low tackiness, more preferably 1 part by weight or more, and further more. It is preferably 3 parts by weight or more. Further, when the content is 100 parts by weight or less, sufficient adhesiveness cannot be obtained, and it becomes easy to suppress a problem that it becomes difficult to receive electronic parts, more preferably 30 parts by weight or less, and even more. It is preferably 25 parts by weight or less.
- the fluorine-based surfactant as a light peeling agent, it is possible to exert a light peeling effect due to the low surface free energy of the fluorine portion.
- the fluorine-based surfactant is not particularly limited, and is, for example, a fluorine-based oligomer, a perfluorobutane sulfonate, a perfluoroalkyl group-containing carboxylate, a hexafluoropentane trimmer derivative-containing sulfonate, and a hexafluoropentane trimmer.
- Examples thereof include a derivative-containing carboxylate, a hexafluoropentane trimmer derivative-containing quaternary ammonium salt, a hexafluoropentane trimmer derivative-containing betaine, and a hexafluoropentane trimmer derivative-containing polyoxyethylene ether, and among them, a fluorine-based oligomer is preferable.
- the fluorine-based surfactant can be used alone or in combination of two or more.
- fluorine-based surfactant examples include, for example, commercially available products whose trade names are Megafuck F-114, F-410 (all manufactured by DIC Corporation), Surflon S-221, S-221, and S-. 231, S-232, S-233, S-241, S-242, S-243, S-420 (all manufactured by AGC Seimi Chemical Co., Ltd.), Surfactant 100, 100C, 110, 150, 150CH, 300, 310 , 320, 400SW, 251,212M, 215M, 250, 209F, 222F, 245F, 208G, 218GL, 240G, 212P, 220P, 228P, FTX-218, DFX-18 (all manufactured by Neos) and the like. These compounds may be used alone or in combination of two or more.
- the weight average molecular weight (Mw) of the fluorine-based oligomer is preferably 3500 or more, more preferably 5000 or more, still more preferably 10,000 or more, and particularly preferably 20000 or more.
- Mw weight average molecular weight
- the weight average molecular weight of the fluorine-based oligomer is 3500 or more, it becomes easy to control the low adhesiveness and low tackiness. Further, when the weight average molecular weight is 20000 or more, foaming at the time of blending the pressure-sensitive adhesive (composition) can be suppressed, and the appearance after the pressure-sensitive adhesive coating is excellent, which is preferable.
- the upper limit of the weight average molecular weight (Mw) of the fluorine-based oligomer is preferably 200,000 or less, more preferably 100,000 or less.
- Mw weight average molecular weight
- the fluorine-based oligomer for example, as a commercially available product, the trade names are Megafuck F-251, F-253, F-281, F-410, F-430, F-444, F-477, F. -510, F-511, F-551, F-552, F-553, F-554, F-555, F-556, F-557, F-558, F-559, F-560, F-561 , F-562, F-563, F-565, F-568, F-569, F-570, F-571, F-572 (all manufactured by DIC Corporation), Surflon S-611, S-651, S.
- the content of the fluorine-based surfactant is not particularly limited, but the weight of the silicone-based polymer as the base polymer is 100. It is preferably 0.01 parts by weight or more and 5 parts by weight or less with respect to the portion. When the content is 0.01 parts by weight or more, it becomes easy to obtain the effect that the first pressure-sensitive adhesive layer can be easily controlled to have low adhesiveness and low tackiness, and more preferably 0.05 parts by weight or more. Even more preferably, it is 0.1 part by weight or more.
- the content is 5 parts by weight or less, sufficient adhesiveness cannot be obtained, it becomes easy to suppress a problem that it becomes difficult to receive electronic parts, and from the viewpoint of suppressing deterioration of transparency, from the viewpoint of suppressing deterioration of transparency. It is more preferably 3 parts by weight or less, and even more preferably 2 parts by weight or less.
- the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer contains a fatty acid ester, low adhesiveness, low tackiness, and wettability to electronic parts of the first pressure-sensitive adhesive layer can be expected.
- fatty acid ester examples include polyoxyethylene bisphenol A lauric acid ester, butyl stearate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, monoglyceride behenate, cetyl 2-ethylhexanoate, and isopropyl myristate.
- the fatty acid ester may be only one kind or two or more kinds.
- the content of the fatty acid ester contained in the urethane-based pressure-sensitive adhesive composition is determined from the viewpoints of low adhesiveness to electronic parts, low tackiness, wettability and stainability to adherends of the first pressure-sensitive adhesive layer. For example, 1 to 50 parts by weight is preferable, 2 to 40 parts by weight is more preferable, and 3 to 30 parts by weight is further preferable with respect to 100 parts by weight of the polyol.
- the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer contains a light peeling agent
- the content (total amount) thereof is low adhesiveness, low tackiness, and wettability to electronic parts of the first pressure-sensitive adhesive layer.
- stainability to electronic parts and electronic parts for example, 0.1 part by weight or more is preferable, 1 part by weight or more is more preferable, and 3 parts by weight or more is further preferable with respect to 100 parts by weight of the base polymer.
- 50 parts by weight or less is preferable, 30 parts by weight or less is more preferable, and 10 parts by weight or less is further preferable.
- the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer contains a deterioration inhibitor such as an antioxidant and an ultraviolet absorber.
- a deterioration inhibitor such as an antioxidant and an ultraviolet absorber.
- the ultraviolet absorber is not particularly limited, and is, for example, a triazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, an oxybenzophenone-based ultraviolet absorber, a salicylate ester-based ultraviolet absorber, and a cyanoacrylate-based agent.
- examples thereof include ultraviolet absorbers, and these can be used alone or in combination of two or more.
- triazine-based UV absorbers and benzotriazole-based UV absorbers are preferable, triazine-based UV absorbers having two or less hydroxyl groups in one molecule, and benzo having one benzotriazole skeleton in one molecule.
- At least one UV absorber selected from the group consisting of triazole UV absorbers has good solubility in the monomer used for forming the acrylic pressure-sensitive adhesive composition, and has a wavelength of around 380 nm. It is preferable because it has a high ability to absorb ultraviolet rays.
- triazine-based ultraviolet absorber having two or less hydroxyl groups in one molecule
- benzophenone-based ultraviolet absorber (benzophenone-based compound) and oxybenzophenone-based ultraviolet absorber (oxybenzophenone-based compound)
- examples of the benzophenone-based ultraviolet absorber (benzophenone-based compound) and oxybenzophenone-based ultraviolet absorber (oxybenzophenone-based compound) include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy.
- -4-methoxybenzophenone-5-sulfonic acid anhydrous and trihydrate
- 2-hydroxy-4-octyloxybenzophenone 4-dodecyloxy-2-hydroxybenzophenone
- 4-benzyloxy-2-hydroxybenzophenone 2, Examples thereof include 2', 4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4-dimethoxybenzophenone and the like.
- salicylic acid ester-based ultraviolet absorber examples include phenyl-2-acryloyloxybenzoate, phenyl-2-acrylyloxy-3-methylbenzoate, and phenyl-2-acryloyloxy.
- cyanoacrylate-based ultraviolet absorber examples include alkyl-2-cyanoacrylate, cycloalkyl-2-cyanoacrylate, alkoxyalkyl-2-cyanoacrylate, alkenyl-2-cyanoacrylate, and alkynyl-.
- 2-Cyanoacrylate and the like can be mentioned.
- the maximum absorption wavelength of the absorption spectrum of the ultraviolet absorber is preferably in the wavelength region of 300 to 400 nm, and more preferably in the wavelength region of 320 to 380 nm.
- antioxidants examples include phenol-based, phosphorus-based, sulfur-based and amine-based antioxidants, and at least one of these is used.
- phenolic antioxidants are preferable, and hindered phenolic antioxidants are particularly preferable.
- phenolic antioxidant examples include 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-ethylphenol, and 2,6-, as monocyclic phenol compounds.
- tetracyclic phenol compound tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, etc.
- phosphorus-containing phenolic compounds bis (ethyl 3,5-di-t-butyl-4-hydroxybenzylphosphonate) calcium, bis (ethyl 3,5-di-t-butyl-4-hydroxybenzylphosphonate) Benzyl and the like can be mentioned.
- the deterioration inhibitor may be used alone or in combination of two or more.
- the content of the deterioration inhibitor contained in the pressure-sensitive adhesive composition is, for example, 0. 01 to 10 parts by weight is preferable, 0.03 to 5 parts by weight is more preferable, and 0.1 to 3 parts by weight is further preferable.
- the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer may contain any suitable other components as long as the effects of the present invention are not impaired.
- suitable other components include tackifiers, inorganic fillers, organic fillers, metal powders, pigments, foils, softeners, plasticizers, conductive agents, surface lubricants, leveling agents, and heat-resistant stables.
- agents, polymerization inhibitors, lubricants, solvents and the like include agents, polymerization inhibitors, lubricants, solvents and the like.
- the second pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for temporarily fixing to a carrier substrate, and is preferably composed of a peelable pressure-sensitive adhesive layer.
- the configuration in which the second pressure-sensitive adhesive layer is composed of a peelable pressure-sensitive adhesive layer is preferable in that the second pressure-sensitive adhesive layer can be peeled off from the carrier substrate without contamination such as adhesive residue, and reworkability can be improved.
- the second pressure-sensitive adhesive layer is a peelable pressure-sensitive adhesive layer by adjusting the adhesiveness according to the type and composition of the pressure-sensitive adhesive, the degree of cross-linking, etc., and by reducing the adhesive strength by physical stimuli such as heat and electromagnetic waves such as ultraviolet rays. Can be.
- the 180 ° peeling adhesive force of the second pressure-sensitive adhesive layer on the glass plate at 25 ° C. is not particularly limited, but it can be peeled off from the carrier substrate without contamination such as adhesive residue, and is 5000 mN from the viewpoint of improving reworkability. It is preferably / 25 mm or less, more preferably 3000 mN / 25 mm or less, and further preferably 1000 mN / 25 mm or less. Further, from the viewpoint of the adhesiveness of the carrier substrate to the second pressure-sensitive adhesive layer, the 180 ° peeling adhesive force of the second pressure-sensitive adhesive layer to the glass plate at 25 ° C. is preferably 1 mN / 25 mm or more, more preferably. Is 5 mN / 25 mm or more.
- the double-sided adhesive sheet for transfer is held at 160 ° C. for 5 minutes against the 180 ° peeling adhesive force (hereinafter, may be referred to as “P2a” in the present specification) of the second pressure-sensitive adhesive layer against the glass plate at 25 ° C.
- P2a 180 ° peeling adhesive force
- P2b the 180 ° peeling adhesive force
- the ratio (P2b / P2a) of the 180 ° peeling adhesive force (hereinafter, may be referred to as “P2b” in the present specification) to the glass plate of the second pressure-sensitive adhesive layer at 25 ° C. is particularly limited. However, 2 or less is preferable, and 2.5 or less is more preferable.
- the configuration in which P2b / P2a is 3 or less means that the electronic component received by the double-sided adhesive sheet for transfer of the present invention is transferred onto the mounting substrate by thermocompression bonding and mounted, and the second adhesive layer with respect to the carrier substrate is mounted. It is preferable in that the adhesive strength does not increase, the peeling is good, and the reworkability is excellent.
- the 180 ° peeling adhesive force of the second pressure-sensitive adhesive layer at 25 ° C. can be measured in the same manner as in the first pressure-sensitive adhesive layer.
- the adhesive strength of the second adhesive layer is determined by adjusting the type and composition of the constituent adhesive, the degree of cross-linking, etc., and by forming WBL (Week Boundary Layer) by blending a light peeling agent and a plasticizer. Can be adjusted.
- the thickness of the second pressure-sensitive adhesive layer is not particularly limited, but is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more. When the thickness is not more than a certain level, the second pressure-sensitive adhesive layer tends to be stably fixed to the carrier substrate, which is preferable.
- the upper limit of the thickness of the second pressure-sensitive adhesive layer is not particularly limited, but is preferably 30 ⁇ m or less, and more preferably 20 ⁇ m or less. When the thickness is not more than a certain level, the second pressure-sensitive adhesive layer is easily peeled off from the carrier substrate, and the reworkability is improved, which is preferable.
- the haze of the second pressure-sensitive adhesive layer is not particularly limited, but is preferably 10% or less, more preferably 5% or less. When the haze is 10% or less, excellent transparency is obtained.
- the pattern for example, the receiving position of the electronic component
- the indicator can be visually recognized, which is preferable.
- a second pressure-sensitive adhesive layer is formed on a separator and allowed to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, then the separator is peeled off and a slide glass (for example, total light beam) is used.
- a haze meter manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150" as a sample, which is attached to a sample with a transmittance of 91.8% and a haze of 0.4%. Can be done.
- the total light transmittance (according to JIS K7361-1) in the visible light wavelength region of the second pressure-sensitive adhesive layer is not particularly limited, but is preferably 85% or more, more preferably 88. % Or more.
- the total light transmittance is 85% or more, excellent transparency is obtained.
- a pattern for example, of an electronic component
- a marker indicating the receiving position can be visually recognized, which is preferable.
- a second pressure-sensitive adhesive layer is formed on the separator and allowed to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, and then the separator is peeled off to obtain a slide glass (for example,).
- Total light transmittance 91.8%, haze 0.4%) as a sample, using a haze meter (manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150”) Can be measured.
- the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer is not particularly limited, but for example, the silicone-based pressure-sensitive adhesive, urethane-based pressure-sensitive adhesive, acrylic-based pressure-sensitive adhesive, and rubber-based pressure-sensitive adhesive used in the first pressure-sensitive adhesive layer described above are not particularly limited. Examples thereof include agents, polyester-based adhesives, polyamide-based adhesives, epoxy-based adhesives, vinyl alkyl ether-based adhesives, and fluorine-based adhesives.
- silicone-based adhesives, urethane-based adhesives, and acrylic-based adhesives are preferable, and urethane-based adhesives and acrylics are preferable because they can be peeled off from the carrier substrate without contamination such as adhesive residue, and from the viewpoint of improving reworkability.
- Based adhesives are more preferable, and acrylic adhesives are even more preferable.
- the second pressure-sensitive adhesive layer in the double-sided adhesive sheet for transfer of the present invention is a pressure-sensitive adhesive layer (adhesive strength can be reduced) capable of intentionally reducing the adhesive force by an external action in the process of using the double-sided adhesive sheet for transfer. It may be a type adhesive layer), or it is an adhesive layer (adhesive strength non-reduced type adhesive layer) in which the adhesive strength is hardly or not reduced by an external action in the process of using the double-sided adhesive sheet for transfer. However, it may be appropriately selected depending on the method and conditions for transferring the electronic component using the double-sided adhesive sheet for transfer of the present invention.
- the second pressure-sensitive adhesive layer When the second pressure-sensitive adhesive layer is a pressure-reducing type pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer exhibits a relatively high adhesive strength in the process of manufacturing and using the double-sided pressure-sensitive adhesive sheet for transfer of the present invention. It is possible to use the state showing relatively low adhesive strength properly.
- the state in which the second pressure-sensitive adhesive layer exhibits relatively high adhesive strength is utilized from the carrier substrate. It is possible to suppress / prevent the floating of the double-sided adhesive sheet for transfer.
- the reworkability can be improved by reducing the adhesive force of the second pressure-sensitive adhesive layer.
- Examples of the pressure-sensitive adhesive forming such a pressure-reducing type pressure-sensitive adhesive layer include a radiation-curable pressure-sensitive adhesive and a heat-foaming type pressure-sensitive adhesive.
- As the pressure-sensitive adhesive forming the pressure-reducing adhesive layer one type of pressure-sensitive adhesive may be used, or two or more types of pressure-sensitive adhesive may be used.
- the radiation-curable pressure-sensitive adhesive for example, a type of pressure-sensitive adhesive that cures by irradiation with an electron beam, ultraviolet rays, ⁇ -rays, ⁇ -rays, ⁇ -rays, or X-rays can be used, and a type that cures by irradiation with ultraviolet rays can be used.
- a pressure-sensitive adhesive (ultraviolet curable pressure-sensitive adhesive) can be particularly preferably used.
- the radiation-curable pressure-sensitive adhesive includes, for example, a base polymer such as an acrylic polymer and a radiation-polymerizable monomer component or oligomer component having a functional group such as a radiation-polymerizable carbon-carbon double bond.
- a base polymer such as an acrylic polymer
- a radiation-polymerizable monomer component or oligomer component having a functional group such as a radiation-polymerizable carbon-carbon double bond.
- Examples include mold radiocurable adhesives.
- the same acrylic polymer as the first pressure-sensitive adhesive layer can be used. All for forming an acrylic polymer from the viewpoint that basic properties such as tackiness due to a hydrocarbon group-containing (meth) acrylic acid ester are appropriately expressed in the second pressure-sensitive adhesive layer, and stickiness and peelability can be easily controlled.
- the proportion of the hydrocarbon group-containing (meth) acrylic acid ester in the monomer component is preferably 40% by mass or more, more preferably 60% by mass or more.
- the acrylic polymer may contain a hydroxy group-containing monomer.
- the acrylic polymer in the second pressure-sensitive adhesive layer contains a hydroxy group-containing monomer, an appropriate cohesive force can be easily obtained in the second pressure-sensitive adhesive layer.
- the proportion of the hydroxy group-containing monomer in the acrylic polymer is, for example, 0.1 to 30% by mass, preferably 0. It is 5 to 20% by mass.
- the acrylic polymer may contain a carboxy group-containing monomer.
- the acrylic polymer in the second pressure-sensitive adhesive layer contains a carboxy group-containing monomer, it is easy to obtain appropriate adhesive reliability in the second pressure-sensitive adhesive layer.
- the ratio of the carboxy group-containing monomer in the acrylic polymer is, for example, 0.1 to 30% by mass, preferably 0.5 to 0.5. It is 20% by mass.
- the acrylic polymer may contain a vinyl ester monomer.
- the acrylic polymer in the second pressure-sensitive adhesive layer contains a vinyl ester-based monomer, an appropriate cohesive force can be easily obtained in the second pressure-sensitive adhesive layer.
- the proportion of the vinyl ester-based monomer in the acrylic polymer is, for example, 0.1 to 60% by mass, preferably 0.5 to 50% by mass. It is mass%.
- the acrylic pressure-sensitive adhesive composition forming the second pressure-sensitive adhesive layer may contain a cross-linking agent.
- the acrylic polymer can be crosslinked to further reduce the low molecular weight substances in the second pressure-sensitive adhesive layer.
- the mass average molecular weight of the acrylic polymer can be increased to control low adhesiveness and peelability.
- the cross-linking agent include polyisocyanate compounds, epoxy compounds, polyol compounds (polyphenol-based compounds and the like), aziridine compounds, melamine compounds and the like, and isocyanate-based cross-linking agents and / or epoxy-based cross-linking agents are preferable cross-linking agents.
- the amount used is preferably about 10 parts by mass or less, more preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the acrylic polymer.
- a cross-linking accelerator may be used in the acrylic pressure-sensitive adhesive composition forming the second pressure-sensitive adhesive layer.
- the type of the cross-linking accelerator can be appropriately selected depending on the type of the cross-linking agent used.
- the cross-linking accelerator refers to a catalyst that increases the rate of the cross-linking reaction by the cross-linking agent.
- Examples of such a cross-linking accelerator include tin (Sn) -containing compounds such as dioctyl tin dilaurate, dibutyl tin dilaurate, dibutyl tin diacetate, dibutyl tin diacetylacetonate, tetra-n-butyl tin, and trimethyl tin hydroxide; Examples thereof include amines such as N', N'-tetramethylhexanediamine and triethylamine, and N-containing compounds such as imidazoles. Of these, Sn-containing compounds are preferable.
- cross-linking accelerators are particularly effective when a hydroxyl group-containing monomer is used as the sub-monomer and an isocyanate-based cross-linking agent is used as the cross-linking agent.
- the amount of the cross-linking accelerator contained in the pressure-sensitive adhesive composition is, for example, about 0.001 to 0.5 parts by mass (preferably about 0.001 to 0.1 parts by mass) with respect to 100 parts by mass of the acrylic polymer. ).
- Examples of the radiation-polymerizable monomer component include urethane (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and dipentaerythritol monohydroxypenta ( Examples thereof include meta) acrylate, dipentaerythritol hexa (meth) acrylate, and 1,4-butanediol di (meth) acrylate.
- the radiation-polymerizable oligomer component examples include various oligomers such as urethane-based, polyether-based, polyester-based, polycarbonate-based, and polybutadiene-based, and those having a molecular weight of about 100 to 30,000 are preferable.
- the content of the radiation-curable monomer component and the oligomer component in the radiation-curable pressure-sensitive adhesive forming the second pressure-sensitive adhesive layer is, for example, 5 to 500 parts by mass, preferably 40 parts by mass with respect to 100 parts by mass of the base polymer. It is about 150 parts by mass.
- the additive-type radiation-curable pressure-sensitive adhesive for example, those disclosed in Japanese Patent Application Laid-Open No. 60-196956 may be used.
- the radiation-curable pressure-sensitive adhesive is an intrinsic radiation-curing agent containing a base polymer having a functional group such as a radiation-polymerizable carbon-carbon double bond at the polymer backbone or at the end of the polymer backbone in the polymer backbone.
- a functional group such as a radiation-polymerizable carbon-carbon double bond at the polymer backbone or at the end of the polymer backbone in the polymer backbone.
- sexual pressure-sensitive adhesives can also be mentioned.
- an intrinsically curable pressure-sensitive adhesive there is a tendency to suppress unintended changes in adhesive properties over time due to the movement of low molecular weight components in the formed second pressure-sensitive adhesive layer. be.
- Acrylic polymer is preferable as the base polymer contained in the internal radiation curable pressure-sensitive adhesive.
- a method for introducing a radiation-polymerizable carbon-carbon double bond into an acrylic polymer for example, a raw material monomer containing a monomer component having a first functional group is polymerized (copolymerized) to obtain an acrylic polymer. Later, a compound having a second functional group capable of reacting with the first functional group and a radiopolymerizable carbon-carbon double bond is added to an acrylic polymer while maintaining the radiopolymerizability of the carbon-carbon double bond. Examples thereof include a method of subjecting to a condensation reaction or an addition reaction.
- Examples of the combination of the first functional group and the second functional group include a carboxy group and an epoxy group, an epoxy group and a carboxy group, a carboxy group and an aziridyl group, an aziridyl group and a carboxy group, and a hydroxy group and an isocyanate group.
- Examples thereof include an isocyanate group and a hydroxy group.
- a combination of a hydroxy group and an isocyanate group and a combination of an isocyanate group and a hydroxy group are preferable from the viewpoint of easiness of reaction tracking.
- the above-mentioned first functional group is used.
- a combination in which the hydroxy group is used and the second functional group is an isocyanate group is preferable.
- Compounds having an isocyanate group and a radiopolymerizable carbon-carbon double bond, that is, a radiopolymerizable unsaturated functional group-containing isocyanate compound include, for example, methacryloyl isocyanate, 2-methacryloyloxyethyl isocyanate, and m-isopropenyl-.
- the acrylic polymer having a hydroxy group contains the above-mentioned hydroxy group-containing monomer and structural units derived from ether compounds such as 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, and diethylene glucol monovinyl ether. Can be mentioned.
- the radiation curable pressure-sensitive adhesive preferably contains a photopolymerization initiator.
- the photopolymerization initiator include ⁇ -ketor compounds, acetophenone compounds, benzoin ether compounds, ketal compounds, aromatic sulfonyl chloride compounds, photoactive oxime compounds, benzophenone compounds, and thioxanthone compounds. Examples thereof include camphorquinone, halogenated ketone, acylphosphinoxide, acylphosphonate and the like.
- the ⁇ -ketol compound include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, ⁇ -hydroxy- ⁇ , ⁇ '-dimethylacetophenone, and 2-methyl-2-hydroxy.
- Examples thereof include propiophenone and 1-hydroxycyclohexylphenyl ketone.
- Examples of the acetophenone compound include methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, and 2-methyl-1- [4- (methylthio) -phenyl] -2. -Molholinopropane-1 and the like can be mentioned.
- Examples of the benzoin ether-based compound include benzoin ethyl ether, benzoin isopropyl ether, anisoin methyl ether and the like.
- Examples of the ketal-based compound include benzyldimethyl ketal and the like.
- Examples of the aromatic sulfonyl chloride compound include 2-naphthalene sulfonyl chloride and the like.
- Examples of the photoactive oxime compound include 1-phenyl-1,2-propanedione-2- (O-ethoxycarbonyl) oxime.
- Examples of the benzophenone compound include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone and the like.
- thioxanthone-based compound examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropyl.
- examples thereof include thioxanthone.
- the content of the photopolymerization initiator in the radiation curable pressure-sensitive adhesive is, for example, 0.05 to 20 parts by mass with respect to 100 parts by mass of the base polymer.
- the heat-foaming pressure-sensitive adhesive is a pressure-sensitive adhesive containing a component (foaming agent, heat-expandable microspheres, etc.) that foams or expands when heated.
- foaming agent include various inorganic foaming agents and organic foaming agents.
- the inorganic foaming agent include ammonium carbonate, ammonium hydrogencarbonate, sodium hydrogencarbonate, ammonium nitrite, sodium boron hydride, azides and the like.
- organic foaming agent examples include salt fluoride alkanes such as trichloromonofluoromethane and dichloromonofluoromethane; azo compounds such as azobisisobutyronitrile, azodicarboxylicamide and barium azodicarboxylate; paratoluene.
- Hydrazide compounds such as sulfonyl hydrazide, diphenylsulfone-3,3'-disulfonyl hydrazide, 4,4'-oxybis (benzenesulfonyl hydrazide), allylbis (sulfonyl hydrazide); p-toluylene sulfonyl semicarbazide, 4,4'- Semi-carbazide compounds such as oxybis (benzenesulfonyl semicarbazide); triazole compounds such as 5-morpholyl-1,2,3,4-thiatriazole; N, N'-dinitrosopentamethylenetetramine, N, N'-dimethyl- Examples thereof include N-nitroso compounds such as N, N'-dinitrosoterephthalamide.
- heat-expandable microspheres examples include microspheres having a structure in which a substance that easily gasifies and expands by heating is enclosed in a shell.
- the substance that easily gasifies and expands by the above heating examples include isobutane, propane, and pentane.
- a heat-expandable microsphere can be produced by encapsulating a substance that easily gasifies and expands by heating in a shell-forming substance by a core selvation method, an interfacial polymerization method, or the like.
- the shell-forming substance a substance exhibiting thermal meltability or a substance that can explode due to the action of thermal expansion of the encapsulating substance can be used.
- Examples of such substances include vinylidene chloride / acrylonitrile copolymer, polyvinyl alcohol, polyvinyl butyral, polymethylmethacrylate, polyacrylonitrile, polyvinylidene chloride, polysulfone and the like.
- Examples of the pressure-sensitive pressure-sensitive adhesive layer include a pressure-sensitive pressure-sensitive adhesive layer.
- the pressure-sensitive pressure-sensitive adhesive layer has a form in which the pressure-sensitive adhesive layer formed from the above-mentioned radiation-curable pressure-sensitive adhesive is cured in advance by irradiation with respect to the pressure-reducing type pressure-sensitive adhesive layer and has a certain adhesive strength. Contains an adhesive layer.
- the pressure-sensitive adhesive forming the non-reducing adhesive strength type pressure-sensitive adhesive layer one type of pressure-sensitive adhesive may be used, or two or more types of pressure-sensitive adhesive may be used.
- the entire second pressure-sensitive adhesive layer may be a non-reduced adhesive force type pressure-sensitive adhesive layer, or a part of the second pressure-sensitive adhesive layer may be a non-reduced adhesive force type pressure-sensitive adhesive layer.
- the entire second pressure-sensitive adhesive layer may be a non-reduced pressure-sensitive adhesive layer, or a specific portion of the second pressure-sensitive adhesive layer may have adhesive strength. It is a non-reducing type pressure-sensitive adhesive layer, and other parts may be a type pressure-sensitive pressure-sensitive adhesive layer that can reduce the adhesive strength.
- the second pressure-sensitive adhesive layer has a laminated structure
- all the pressure-sensitive adhesive layers in the laminated structure may be non-reduced adhesive strength type pressure-sensitive adhesive layers, and some of the pressure-sensitive adhesive layers in the laminated structure adhere to each other. It may be a force-reduced pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive layer (irradiated radiation-curable pressure-sensitive adhesive layer) in which the pressure-sensitive adhesive layer (non-irradiated radiation-curable pressure-sensitive adhesive layer) formed from the radiation-curable pressure-sensitive adhesive is previously cured by irradiation is radiation. Even if the adhesive strength is reduced by irradiation, it exhibits adhesiveness due to the polymer component contained therein, and can exhibit the minimum adhesive strength required for the double-sided adhesive sheet for transfer of the present invention.
- the entire second pressure-sensitive adhesive layer may be the radiation-irradiated radiation-curable pressure-sensitive adhesive layer in the surface spreading direction of the second pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive layer may be used.
- a part of the agent layer may be a radiation-irradiated radiation-curable pressure-sensitive adhesive layer, and the other part may be a radiation-unirradiated radiation-curable pressure-sensitive adhesive layer.
- the “radiocurable pressure-sensitive adhesive layer” refers to a pressure-sensitive adhesive layer formed of a radiation-curable pressure-sensitive adhesive, which is a radiation-curable non-irradiated radiation-curable pressure-sensitive adhesive layer and the pressure-sensitive adhesive. Includes both a radiation-cured, radiation-curable pressure-sensitive adhesive layer after the agent layer has been cured by irradiation.
- the pressure-sensitive adhesive for forming the pressure-sensitive pressure-sensitive adhesive layer a known or conventional pressure-sensitive pressure-sensitive adhesive can be used, and an acrylic pressure-sensitive adhesive using an acrylic polymer as a base polymer can be preferably used.
- the acrylic polymer is a polymer containing a structural unit derived from a (meth) acrylic acid ester as the structural unit having the largest mass ratio. Is preferable.
- the acrylic polymer for example, the acrylic polymer described as the acrylic polymer that can be contained in the above-mentioned additive-type radiation-curable pressure-sensitive adhesive can be adopted.
- the base material in the double-sided pressure-sensitive adhesive sheet for transfer of the present invention is an element that functions as a support in the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer.
- Examples of the base material include a plastic base material (particularly a plastic film).
- the base material may be a single layer or a laminated body of the same type or different types of base materials.
- Examples of the resin constituting the plastic base material include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-low-density polyethylene, random copolymerized polypropylene, block copolymerized polypropylene, and homopolyprolene.
- Ethylene-vinyl acetate copolymer Ethylene-vinyl acetate copolymer (EVA), Ionomer, Ethylene- (meth) acrylic acid copolymer, Ethylene- (meth) acrylic acid ester (random, alternating) copolymer, Ethylene- Polyolefin resins such as butene copolymers and ethylene-hexene copolymers; polyurethane; polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate and polybutylene terephthalate (PBT); polycarbonates; polyimides; polyether ether ketones; polyetherimides Examples thereof include polyamides such as aramid and total aromatic polyamides; polyphenyl sulfides; fluororesins; polyvinyl chlorides; polyvinylidene chlorides; cellulose resins; silicone resins and the like.
- EVA Ethylene-vinyl acetate copoly
- the base material is mainly a heat-resistant resin such as polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (PA), and polyetheretherketone (PEEK). It is preferable to include it as a component, and it is more preferable to contain polyimide as a main component.
- the main component of the base material is a component that occupies the largest mass ratio among the constituent components. As the above resin, only one kind may be used, or two or more kinds may be used.
- the second pressure-sensitive adhesive layer is a radiation-curable pressure-sensitive adhesive layer as described above, it is preferable that the base material has radiation permeability.
- the plastic film may be non-oriented or may be oriented in at least one direction (uniaxial direction, biaxial direction, etc.), but the non-oriented property is heat-shrinkable. It is preferable because it is difficult to show.
- the surface of the base material on the side of the first pressure-sensitive adhesive layer and / or the second pressure-sensitive adhesive layer is, for example, corona discharge treatment, plasma treatment, sand mat processing, etc., for the purpose of improving adhesion, retention, etc. with the pressure-sensitive adhesive layer.
- Physical treatment such as ozone exposure treatment, flame exposure treatment, high piezoelectric shock exposure treatment, ionized radiation treatment; chemical treatment such as chromium acid treatment; coating agent (undercoating agent); surface treatment such as easy adhesion treatment by silicone primer treatment It may be given.
- a conductive vapor-filmed layer containing a metal, an alloy, an oxide thereof or the like may be provided on the surface of the substrate, or a conductive polymer such as PEDOT-PSS may be coated. It is preferable that the surface treatment for enhancing the adhesion is applied to the entire surface of the base material on the pressure-sensitive adhesive layer side.
- the thickness of the base material is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, still more preferably 15 ⁇ m, from the viewpoint of ensuring the strength for the base material to function as a support in the double-sided pressure-sensitive adhesive sheet for transfer of the present invention. As mentioned above, it is particularly preferably 20 ⁇ m or more. Further, from the viewpoint of realizing appropriate flexibility in the double-sided pressure-sensitive adhesive sheet for transfer of the present invention, the thickness of the base material is preferably 200 ⁇ m or less, more preferably 180 ⁇ m or less, still more preferably 150 ⁇ m or less.
- the haze of the base material is not particularly limited, but is preferably 10% or less, more preferably 5.0% or less. When the haze is 10% or less, excellent transparency is obtained.
- the pattern for example, the receiving position of the electronic component attached on the carrier substrate is determined.
- the indicator can be visually recognized, which is preferable.
- the haze can be measured using a haze meter (manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150").
- the total light transmittance (according to JIS K7361-1) in the visible light wavelength region of the substrate is not particularly limited, but is preferably 85% or more, more preferably 88% or more. be.
- the total light transmittance is 85% or more, excellent transparency is obtained.
- a pattern for example, of an electronic component
- a marker indicating the receiving position can be visually recognized, which is preferable.
- the total light transmittance can be measured using a haze meter (manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150").
- the surface of the pressure-sensitive adhesive layer (the pressure-sensitive surface of the first pressure-sensitive adhesive layer and / or the second pressure-sensitive adhesive layer) of the double-sided pressure-sensitive adhesive sheet for transfer of the present invention may be protected by a separator until use.
- the separator is used as a protective material for the pressure-sensitive adhesive layer, and is peeled off when the pressure-sensitive adhesive sheet is attached to the adherend.
- 2A and 2B are schematic cross-sectional views showing an embodiment of the double-sided adhesive sheet for transfer of the present invention, in which 1 is a double-sided adhesive sheet for transfer, 10 is a base material, 11 is a first adhesive layer, and 12 is a second adhesive.
- the agent layers 110 and 120 indicate separators. The separator may not always be provided.
- a conventional release paper or the like can be used.
- a fluorine-based polymer for example, polytetrafluoroethylene
- a fluorine-based polymer for example, polytetrafluoroethylene
- a low adhesive base material made of for example, an olefin resin such as polyethylene or polypropylene
- an olefin resin such as polyethylene or polypropylene
- a separator having a peeling treatment layer formed on at least one surface of the separator base material can be preferably used.
- the base material for such a separator include polyester film (polyethylene terephthalate film, etc.), olefin resin film (polyethylene film, polypropylene film, etc.), polyvinyl chloride film, polyimide film, polyamide film (nylon film), rayon film, and the like.
- plastic-based base film synthetic resin film
- papers high-quality paper, Japanese paper, kraft paper, glassin paper, synthetic paper, top-coated paper, etc.
- these are multi-layered by laminating or co-extrusion. (Complex of 2 to 3 layers) and the like.
- the peeling treatment agent constituting the peeling treatment layer is not particularly limited, and for example, a silicone-based peeling treatment agent, a fluorine-based peeling treatment agent, a long-chain alkyl-based peeling treatment agent, or the like can be used.
- the stripping agent can be used alone or in combination of two or more. Since the first pressure-sensitive adhesive layer is composed of a low-stickiness pressure-sensitive adhesive layer, it is possible to use a base material that has not been treated with the release treatment agent as a separator.
- the separator may have an antistatic layer formed on at least one surface of the separator base material in order to prevent adverse effects on electronic components.
- the antistatic layer may be formed on one surface (peeling-treated surface or untreated surface) of the separator, or may be formed on both surfaces (peeling-treated surface and untreated surface) of the separator.
- the antistatic agent contained in the antistatic resin forming the antistatic layer is a cationic type having a cationic functional group such as a quaternary ammonium salt, a pyridinium salt, and a first, second, and third amino group.
- Antistatic agents, anionic antistatic agents having anionic functional groups such as sulfonates and sulfates, phosphonates, phosphates, alkylbetaine and its derivatives, imidazoline and its derivatives, alanine and its derivatives, etc.
- Antistatic agents of both sexes, aminoalcohol and its derivatives, glycerin and its derivatives, nonionic antistatic agents such as polyethylene glycol and its derivatives, and the above-mentioned cationic, anionic and amphoteric ionic conductive groups include an ionic conductive polymer obtained by polymerizing or copolymerizing a having monomer. These compounds may be used alone or in combination of two or more.
- the thickness of the separator is not particularly limited and may be appropriately selected from the range of 5 to 100 ⁇ m.
- the method for producing the double-sided pressure-sensitive adhesive sheet for transfer of the present invention varies depending on the composition of the pressure-sensitive adhesive composition and the like, and is not particularly limited, and known forming methods can be used. 4) and other methods can be mentioned.
- the pressure-sensitive adhesive composition is applied (coated) on a substrate to form a composition layer, and the composition layer is cured (for example, heat curing or curing by irradiation with active energy rays such as ultraviolet rays).
- a method for producing an adhesive sheet by forming an adhesive layer (2) The above-mentioned adhesive composition is applied (coated) on a separator to form a composition layer, and the composition layer is cured (for example,).
- thermosetting As the curing method in the above (1) to (4), a method of thermosetting is preferable in that a homogeneous and surface-smooth adhesive layer can be formed in terms of excellent productivity.
- a known coating method can be adopted, and is not particularly limited, but for example, a roll coat, a kiss roll coat, a gravure coat, and a reverse coat.
- the thickness (total thickness) of the double-sided pressure-sensitive adhesive sheet for transfer of the present invention is not particularly limited, but is preferably 10 ⁇ m or more, and more preferably 15 ⁇ m or more. When the thickness is a certain value or more, the first pressure-sensitive adhesive layer can easily receive the electronic component with high accuracy, which is preferable.
- the upper limit of the thickness (total thickness) of the double-sided adhesive sheet for transfer of the present invention is not particularly limited, but is preferably 500 ⁇ m or less, and more preferably 300 ⁇ m or less. When the thickness is not more than a certain level, it becomes easy to transfer the electronic component to the mounting substrate with high accuracy, which is preferable.
- the thickness of the double-sided adhesive sheet for transfer of the present invention does not include the thickness of the separator.
- the haze of the double-sided pressure-sensitive adhesive sheet for transfer (according to JIS K7136) of the present invention is not particularly limited, but is preferably 10% or less, more preferably 5.0% or less. When the haze is 10% or less, excellent transparency is obtained.
- the pattern for example, the receiving position of the electronic component
- the indicator can be visually recognized, which is preferable.
- the double-sided pressure-sensitive adhesive sheet for transfer is allowed to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, and then the separator, if any, is peeled off and the slide glass (for example, total light beam) is removed.
- a haze meter manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150" as a sample, which is attached to a sample with a transmittance of 91.8% and a haze of 0.4%. Can be done.
- the total light transmittance (according to JIS K7361-1) in the visible light wavelength region of the double-sided adhesive sheet for transfer of the present invention is not particularly limited, but is preferably 85% or more, more preferably 88% or more. When the total light transmittance is 85% or more, excellent transparency is obtained.
- a pattern for example, of an electronic component
- a marker indicating the receiving position can be visually recognized, which is preferable.
- the double-sided adhesive sheet for transfer is allowed to stand in a normal state (23 ° C., 50% RH) for at least 24 hours, and then the separator, if any, is peeled off to obtain a slide glass (for example,).
- Total light transmittance 91.8%, haze 0.4%) as a sample, using a haze meter (manufactured by Murakami Color Technology Laboratory Co., Ltd., trade name "HM-150”) Can be measured.
- the double-sided adhesive sheet for transfer of the present invention is suitably used for a method of mounting an electronic component on a mounting substrate.
- the method for mounting an electronic component on a mounting substrate using the double-sided adhesive sheet for transfer of the present invention preferably includes the following steps.
- a step of transferring the electronic component received by the first pressure-sensitive adhesive layer to a mounting substrate (second step).
- FIG. 3 is a schematic cross-sectional view showing an embodiment of the first step in a method of mounting an electronic component on a mounting substrate using the double-sided adhesive sheet for transfer of the present invention.
- the double-sided adhesive sheet 1 for transfer is attached to the carrier substrate 22 on the adhesive surface of the second adhesive layer 12.
- a marking pattern for arranging electronic components may be attached to the surface of the carrier substrate 22 that is attached to the second adhesive layer 12. Since the double-sided adhesive sheet 1 for transfer has high transparency, the marking pattern attached to the carrier substrate 22 can be visually recognized.
- a plurality of electronic components 21 individualized by dicing are attached to the dicing tape 20 and the first adhesive layer is attached. It is arranged so as to face the adhesive surface of 11 and to be separated from each other.
- the electronic component 21 is pushed by the pin member 23 from the surface on which the electronic component 21 of the dicing tape 20 is not attached so that the electronic component 21 is brought close to the adhesive surface of the first adhesive layer 11. ,
- the adhesive surface of the first adhesive layer 11 receives.
- the electronic component 21 may be received in contact with the first pressure-sensitive adhesive layer 11 or may be received in a non-contact manner.
- the electronic component 21 is pushed until the electronic component 21 is peeled off from the dicing tape 20, and the electronic component 21 is dropped onto the adhesive surface.
- the adhesive surface of the first pressure-sensitive adhesive layer 11 When the first pressure-sensitive adhesive layer 11 is received in contact with each other, the adhesive surface of the first pressure-sensitive adhesive layer 11 has low adhesiveness, and therefore the stress when the electronic component 21 is received is weak, so that damage to the electronic component 21 can be suppressed. When received in a non-contact manner, the adhesive surface of the first adhesive layer 11 has low adhesiveness, so that the dropped electronic component 21 can be caught with high positional accuracy.
- the electronic component 21 may be peeled from the dicing tape 20 by irradiating the pin member 23 with radiation such as ultraviolet rays or a laser beam.
- the electronic component 21 may be received by the first pressure-sensitive adhesive layer 11 individually, or a plurality of electronic components 21 may be received at once.
- FIG. 3C is a schematic cross-sectional view showing a form in which all the electronic components 21 of the dicing tape 20 are received on the adhesive surface of the first adhesive layer 11 of the double-sided adhesive sheet 1 for transfer.
- FIG. 4 is a schematic cross-sectional view showing a second step in a method of mounting an electronic component on a mounting substrate using the double-sided adhesive sheet for transfer of the present invention.
- the mounting substrate 30 is arranged on the adhesive surface of the first adhesive layer 11 of the double-sided adhesive sheet 1 for transfer, facing and separated from the circuit surface 31 (circuit pattern is not shown).
- the electronic component 21 is arranged.
- FIG. 4B the circuit surface 31 of the mounting substrate 30 and the electronic components 21 arranged on the adhesive surface of the first adhesive layer 11 of the transfer double-sided adhesive sheet 1 are brought close to each other.
- the electronic component 21 and the circuit surface 31 of the mounting board 30 are brought into contact with each other.
- the transfer of the electronic component 21 to the circuit surface 31 of the mounting substrate 30 may be performed by thermocompression bonding (for example, 150 ° C. for 1 minute). Since the base material 10, the first pressure-sensitive adhesive layer 11, and / or the second pressure-sensitive adhesive layer 12 constituting the double-sided pressure-sensitive adhesive sheet 1 for transfer have excellent heat resistance, they can be expanded or contracted by thermocompression bonding, and have adhesive strength. Is hard to change, so that the electronic component 21 can be transferred to the circuit surface 31 of the mounting board 30 with high accuracy.
- the electronic component 21 is peeled off from the first adhesive layer 11 and the circuit surface 31 of the mounting substrate 30 is separated. Is transferred to. Since the first pressure-sensitive adhesive layer 11 is composed of a low-stickiness pressure-sensitive adhesive layer, the electronic component 21 can be easily peeled off, and the electronic component 21 can be efficiently mounted on the mounting substrate 30 without being damaged. ..
- the transfer double-sided adhesive sheet 1 of FIG. 4C after the electronic component 21 is mounted on the mounting substrate 30 may be peeled off from the carrier substrate 22 (not shown). Since the second pressure-sensitive adhesive layer 12 is composed of a peelable pressure-sensitive adhesive layer, it can be peeled off without adhesive residue and has excellent reworkability, so that the carrier substrate 22 can be easily reused.
- the electronic components to be mounted on the mounting board are not particularly limited, but can be suitably used for fine and thin semiconductor chips and LED chips.
- Acrylic acid manufactured by Toa Synthetic Co., Ltd.: 5 parts by weight, 2,2'-azobisisobutyronitrile (manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization initiator: 0.2 parts by weight, ethyl acetate: 156 parts by weight Was charged, nitrogen gas was introduced while gently stirring, the polymerization reaction was carried out for 10 hours while keeping the liquid temperature in the flask at around 63 ° C., and the solution of the acrylic copolymer (2) having a weight average molecular weight of 700,000 was (2). Solid content: 40% by weight) was prepared.
- Niper BW 0.2 part by weight (manufactured by NOF CORPORATION) was added dropwise as a polymerization initiator diluted with 96 parts by weight of toluene, and the liquid temperature in the flask was maintained at around 40 ° C. After that, the temperature of the liquid in the flask was raised to 60 ° C. and the polymerization reaction was carried out for 8 hours, then the temperature was raised to 95 ° C. and the mixture was stirred for 4 hours, and the solution (solid) of the acrylic copolymer (3) having a weight average molecular weight of 560,000 was obtained. Minutes: 35% by weight) were prepared.
- Silicone-based adhesive 1 (additional reaction type silicone-based adhesive, trade name "X-40-3306", manufactured by Shin-Etsu Chemical Industry Co., Ltd.): 100 parts by weight, platinum-based catalyst 1 (trade name "CAT-PL-50T”) , Shin-Etsu Chemical Industry Co., Ltd.): 1.4 parts by weight, Silicone-based release agent 1 (additional reaction type silicone-based release agent containing dimethylpolysiloxane as the main component, trade name "KS-776A”, Shin-Etsu Chemical Industry Co., Ltd.
- silicone-based pressure-sensitive adhesive composition Silicone-based pressure-sensitive adhesive composition 1). .. Silicone-based adhesive to the base film (1) (polyester film with one side treated with silicone primer, thickness 75 ⁇ m, trade name “Diafoil MRF # 75”, manufactured by Mitsubishi Resin Co., Ltd.) The agent composition 1 was applied so that the glue thickness after drying was 10 ⁇ m, cured under the conditions of a drying temperature of 120 ° C. and a drying time of 5 minutes, and dried.
- a film having a silicone-based pressure-sensitive adhesive layer (1) on the silicone primer-treated layer of the base film (1) was obtained.
- a separator (1) (a polyethylene terephthalate film that has not been peeled off, a thickness of 25 ⁇ m, a trade name of “Lumilar S10 # 25”, manufactured by Toray Co., Ltd.) is bonded onto the adhesive surface of the silicone-based adhesive film, and the silicone-based adhesive film is adhered.
- a laminated body (1) having a laminated structure of [separator (1) layer] / [silicone adhesive (1) layer] / [base film (1) layer]] was obtained by protecting the agent layer.
- the thickness of the acrylic pressure-sensitive adhesive composition after drying with a fountain roll on the release-treated layer side of the separator (2) peeleled polyethylene terephthalate film, thickness 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Chemical Co., Ltd.
- MRF # 38 trade name “MRF # 38”
- the acrylic pressure-sensitive adhesive layer (1) was formed on the separator (2).
- the base film (1) side (silicone primer non-treated surface) of the laminate (1) obtained above was bonded to the surface of the acrylic pressure-sensitive adhesive layer (1), and [separator (1) layer].
- Example 2 To 100 parts by weight of the solid content of the acrylic copolymer (2) obtained in Production Example 2, 6 parts by weight of TETRAD-C (manufactured by Mitsubishi Gas Chemicals, Inc.) was added as a cross-linking agent in terms of solid content. The same as in Example 1 except that the acrylic pressure-sensitive adhesive composition obtained by diluting with ethyl acetate so that the total solid content becomes 25% by weight and stirring with a disper was applied to the separator (2).
- TETRAD-C manufactured by Mitsubishi Gas Chemicals, Inc.
- Example 3 In the solution of the acrylic copolymer (1) obtained in Production Example 1, Coronate L (manufactured by Toso Co., Ltd.) was added as a cross-linking agent to 100 parts by weight of the solid content in terms of solid content.
- Coronate L manufactured by Toso Co., Ltd.
- Example 4 2.
- TETRAD-C manufactured by Mitsubishi Gas Chemicals, Inc.
- a cross-linking agent was added to 100 parts by weight of the solid content in terms of solid content. Examples except that 0 parts by weight was added, the mixture was diluted with methyl ethyl ketone so that the total solid content was 25% by weight, stirred with a disper, and the obtained acrylic pressure-sensitive adhesive composition was applied to the separator (2).
- Example 5 As a prepolymer type urethane adhesive composition (1), in a solution of Siavine SH-109 (manufactured by Toyochem Co., Ltd.), coronate HX (manufactured by Toso Co., Ltd.) as a cross-linking agent with respect to 100 parts by weight of the solid content thereof.
- the agent solution was applied to the base film (2) (untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, manufactured by Toray Co., Ltd.) so that the thickness after drying was 20 ⁇ m, and the drying temperature was 130 ° C. , Cure and dry under the condition of drying time of 30 seconds, and on the adhesive surface of the obtained urethane adhesive film, separator (2) (peeling-treated polyethylene terephthalate film, thickness 38 ⁇ m, trade name “MRF # 38”, [Separator (2) layer] / [Urethane-based adhesive (1) layer (first adhesive layer) in the same manner as in Example 1 except that the urethane-based adhesive layer was protected by laminating). )] / [Base film (2) layer] / [Acrylic adhesive (1) layer (second adhesive layer)] / [Separator (2) layer] rice field.
- base film (2) untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, manufactured by Toray Co
- [Surface protective film layer] / [Polyurethane resin film layer] / [Acrylic adhesive (1) layer (second adhesive layer)] / [Separator (2) layer] A double-sided sheet for transfer having the laminated structure of the above was obtained.
- Example 3 instead of the silicone-based pressure-sensitive adhesive composition 1, the acrylic-based pressure-sensitive adhesive composition used in Example 1 was used as a base film (2) (untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, It was applied to Toray Co., Ltd.) so that the thickness after drying was 20 ⁇ m, cured under the conditions of a drying temperature of 130 ° C. and a drying time of 30 seconds, and dried.
- Example 4 instead of the silicone-based pressure-sensitive adhesive composition 1, the acrylic-based pressure-sensitive adhesive composition used in Example 2 was used as a base film (2) (untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, It was applied to Toray Co., Ltd.) so that the thickness after drying was 20 ⁇ m, cured under the conditions of a drying temperature of 130 ° C. and a drying time of 30 seconds, and dried. (2) The same as in Example 1 except that the peel-treated polyethylene terephthalate film, thickness 38 ⁇ m, trade name “MRF # 38”, manufactured by Mitsubishi Chemical Co., Ltd.) was bonded to protect the acrylic adhesive layer.
- Example 5 instead of the silicone-based pressure-sensitive adhesive composition 1, the acrylic-based pressure-sensitive adhesive composition used in Example 3 was used as a base film (2) (untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, It was applied to Toray Co., Ltd.) so that the thickness after drying was 20 ⁇ m, cured under the conditions of a drying temperature of 130 ° C. and a drying time of 30 seconds, and dried.
- the acrylic-based pressure-sensitive adhesive composition used in Example 4 was used as a base film (2) (untreated PET film, thickness 75 ⁇ m, trade name “Lumilar S10 # 75”, It was applied to Toray Co., Ltd.) so that the thickness after drying was 20 ⁇ m, cured under the conditions of a drying temperature of 130 ° C. and a drying time of 30 seconds, and dried.
- the masking material was peeled off, and blade dicing of a Si wafer and a dicing tape was performed under the conditions shown in Table 2 below to prepare a dicing dicing film in which a plurality of silicon chips having a side of 1 mm square were arranged and fixed.
- Ultraviolet irradiation device manufactured by Nitto Seiki Co., Ltd., product name: UM810
- Light source High-pressure mercury lamp
- the dicing ring was attached so that the first pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet for transfer was on the surface, and the separator (1) of the first pressure-sensitive adhesive layer was peeled off.
- dicing to a depth of 30 ⁇ m on the surface of the double-sided pressure-sensitive adhesive sheet was used to prepare a double-sided pressure-sensitive adhesive sheet for transfer with markings paired with a dicing die-bonded film in which a plurality of silicon chips having a side of 1 mm square were arranged and fixed.
- the surface on which the silicon chip with the adhesive layer of the dicing die bond film obtained above is fixed is arranged downward, and the double-sided pressure-sensitive adhesive sheet for transfer (on the first pressure-sensitive adhesive layer side of the base material) obtained in Examples and Comparative Examples.
- the first pressure-sensitive adhesive layer (marked) is placed facing upward so that the clearance is 1 mm, the markings are aligned, and the silicon with the adhesive layer is placed on the upper side (from the back side) of the dicing die bond film.
- the chips were pushed with a needle and 10 pieces were dropped on the adhesive surface of the first adhesive layer. All the dropped silicon chips were visually confirmed, and it was confirmed whether they were accurately dropped at the marking position and whether they were dropped without being turned over, and evaluated according to the following criteria.
- Lumirer S10 # 25 manufactured by Toray Industries, Inc.
- a PET film "trade name: Lumirer S10 # 25 (manufactured by Toray Industries, Inc.)" cut into a width of 20 mm and a length of 100 mm was applied to the first adhesive layer from which the separator was peeled off in an environment of 23 ° C. ⁇ 50% RH. It was pasted by 2.0 kg 1 round trip. It was cured for 30 minutes in an environment of 23 ° C. ⁇ 50% RH. Then, it was heated in an air circulation type constant temperature oven at 160 ° C. for 5 minutes and taken out. After that, it was allowed to cool for 30 minutes in an environment of 23 ° C.
- peeling was performed using a universal tensile tester (manufactured by Minebea Co., Ltd., product name: TCM-1kNB) at a peeling angle of 180 degrees and a tensile speed of 300 mm / min. The adhesive strength was measured.
- the double-sided adhesive sheet for transfer of Examples and Comparative Examples was cut into a width of 20 mm and a length of 50 mm to prepare a sample for evaluation.
- the surface of the adhesive layer on the non-measured surface of the evaluation sample was attached to a glass plate (manufactured by Matsunami Glass Ind. Co., Ltd., trade name: microslide glass S) with a hand roller.
- the separator attached to the surface to be measured was peeled off, and the tacking force (gf / 5 mm ⁇ SUS) was measured under the following conditions using a tacking tester (manufactured by Resca, product name: TAC-II) ⁇ Measurement conditions>
- Glass reworkability In the measurement of the adhesive force of the second pressure-sensitive adhesive layer on the glass plate after 5 minutes at 160 ° C., the glass reworkability was judged based on the following criteria. ⁇ : 3N / 25mm or less ⁇ : 3N / 25mm or more 5N / 25mm or less ⁇ : 5N / 25mm or more
- a double-sided pressure-sensitive adhesive sheet for transfer in which a first pressure-sensitive adhesive layer, a base material, and a second pressure-sensitive adhesive layer are laminated in this order.
- the first pressure-sensitive adhesive layer comprises a low-stickiness pressure-sensitive adhesive layer.
- the second pressure-sensitive adhesive layer is a double-sided pressure-sensitive adhesive sheet for transfer, which is composed of a peelable pressure-sensitive adhesive layer.
- Appendix 2 The double-sided adhesive sheet for transfer according to Appendix 1, wherein the first pressure-sensitive adhesive layer has a storage elastic modulus of 50 MPa or less at a frequency of 1 Hz and 25 ° C. by AFM-DMA.
- [Appendix 8] A method of mounting electronic components on a mounting board. A step of receiving the diced electronic component by the first pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet for transfer according to any one of Supplementary note 1 to 7. A method comprising the step of transferring an electronic component received by the first pressure-sensitive adhesive layer to a mounting substrate.
- [Appendix 9] The method according to Appendix 8, wherein the carrier substrate is attached to the second pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet for transfer.
- [Appendix 10] The method according to Appendix 8 or 9, wherein the electronic component is a semiconductor chip.
- Double-sided adhesive sheet for transfer 10 Base material 11 First adhesive layer 12 Second adhesive layer 110, 120 Separator 20 Dicing tape 21 Electronic components 22 Carrier substrate 23 Pin member 30 Mounting substrate 31 Circuit surface
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Abstract
Description
また、半導体装置の小型化、多層化も進んでおり、多数の微細な半導体チップを実装基板上に密に多層実装することが要求されてきており、コレットにより個別に実装するのは効率が悪いという問題もあった。
一方、前記第2粘着剤層は、本発明の第1の側面の転写用両面粘着シートを土台となる基板(キャリア基板)に仮固定するための粘着剤層である。
本発明の第2の側面の方法において、電子部品としては、半導体チップを好適に使用することができる。
本発明の転写用両面粘着シートは、第1粘着剤層と、基材と、第2粘着剤層とがこの順に積層された積層構造を有する。本発明の転写用両面粘着シートの一実施形態について、図面を参照して、以下に説明することがあるが、本発明の転写用両面粘着シートは当該実施形態に限定されるものではない。図1は、本発明の転写用両面粘着シートの一実施形態を示す断面模式図であり、1は転写用両面粘着シート、10は基材、11は第1粘着剤層、12は第2粘着剤層を示す。
本発明の転写用両面粘着シートにおいて、第1粘着剤層は、電子部品を受け取って保持するための粘着剤層であり、低粘着性粘着剤層からなるものであることが好ましい。第1粘着剤層が低粘着性粘着剤層からなるという構成は、受け取る際に電子部品にかかる力を低減でき、電子部品の損傷を抑制できる点で好適である。また、電子部品を非接触で第1粘着剤層が受け取る際には、例えば、電子部品をダイシングテープからピン部材で押すなどして剥離させ、第1粘着剤層上に落下させる。しかし、落下した電子部品を第1粘着剤層が受け取る際に跳ねて精度よく受け取ることができない場合がある。当該現象が発生した場合には、電子製品の位置精度が低下し、接触不良が生じる場合がある。前記第1粘着剤層が低粘着性粘着剤層からなるという構成は、電子部品を非接触で第1粘着剤層が受け取る際に、電子部品が跳ねずに第1粘着剤層にキャッチされやすく、位置精度よく受け取ることができる点でも好適である。さらには、転写用両面粘着シートが受け取った電子部品を実装基板に実装する際に、第1粘着剤層から電子部品を容易に剥離できる点でも好ましい。
前記第1粘着剤層の上記粘着力は、構成する粘着剤の種類や組成、架橋度などを調整することや、軽剥離化剤や可塑剤の配合によるWBL(Weak Boundary Layer)の形成により、調整することができる。
シリコーン系粘着剤としては、特に制限されず、公知乃至慣用のシリコーン系粘着剤を用いることができ、例えば、付加型シリコーン系粘着剤、過酸化物硬化型シリコーン系粘着剤、縮合型シリコーン系粘着剤などを用いることができる。シリコーン系粘着剤は1液型、2液型のいずれであってもよい。シリコーン系粘着剤は1種単独で又は2種以上を組み合わせて使用することができる。
ウレタン系粘着剤としては、特に制限されず、公知乃至慣用のウレタン系粘着剤を用いることができ、低粘着性、低タック性にコントロールしやすい点より、ポリオール、多官能イソシアネート系化合物、及び触媒を含有するウレタン系粘着剤組成物が好ましい。
アクリル系粘着剤としては、特に制限されず、公知乃至慣用のアクリル系粘着剤を用いることができ、例えば、低粘着性、低タック性にコントロールしやすい点より、アクリル系ポリマーをベースポリマーとして含有するアクリル系粘着剤組成物が挙げられる。
本発明の転写用両面粘着シートにおいて、第2粘着剤層は、キャリア基板に仮固定するための粘着剤層であり、剥離性粘着剤層からなるものであることが好ましい。前記第2粘着剤層が剥離性粘着剤層からなるという構成は、当該第2粘着剤層をキャリア基板から糊残りなどの汚染がなく剥離することができ、リワーク性が向上できる点で好ましい。
前記第2粘着剤層は、粘着剤の種類や組成、架橋度などによる粘着性の調整や、熱、紫外線などの電磁波などの物理的刺激により粘着力を低下させることにより、剥離性粘着剤層とすることができる。
前記第2粘着剤層の上記粘着力は、構成する粘着剤の種類や組成、架橋度などを調整することや、軽剥離化剤や可塑剤の配合によるWBL(Weak Boundary Layer)の形成により、調整することができる。
本発明の転写用両面粘着シートにおける基材は、第1粘着剤層や第2粘着剤層において支持体として機能する要素である。基材としては、例えば、プラスチック基材(特にプラスチックフィルム)が挙げられる。上記基材は、単層であってもよいし、同種又は異種の基材の積層体であってもよい。
本発明の転写用両面粘着シートの粘着剤層表面(第1粘着剤層及び/又は第2粘着剤層の粘着面)は、使用時まではセパレータにより保護されていてもよい。セパレータは粘着剤層の保護材として用いられており、粘着シートを被着体に貼付する際に剥がされる。図2は、本発明の転写用両面粘着シートの一実施形態を示す断面模式図であり、1は転写用両面粘着シート、10は基材、11は第1粘着剤層、12は第2粘着剤層、110、120はセパレータを示す。なお、セパレータは、必ずしも設けられていなくてもよい。
なお、第1粘着剤層は、低粘着性粘着剤層で構成されているため、剥離処理剤で処理されていない基材をセパレータとして使用することも可能である。
(1)上記粘着剤組成物を基材上に塗布(塗工)して組成物層を形成し、該組成物層を硬化(例えば、熱硬化や紫外線などの活性エネルギー線照射による硬化)させて粘着剤層を形成して粘着シートを製造する方法
(2)上記粘着剤組成物を、セパレータ上に塗布(塗工)して組成物層を形成し、該組成物層を硬化(例えば、熱硬化や紫外線などの活性エネルギー線照射による硬化)させて粘着剤層を形成した後、該粘着剤層を基材上に転写して粘着シートを製造する方法
(3)上記粘着剤組成物を、基材上に塗布(塗工)し、乾燥させて粘着剤層を形成して粘着シートを製造する方法
(4)上記粘着剤組成物を、セパレータ上に塗布(塗工)し、乾燥させて粘着剤層を形成した後、該粘着剤層を基材上に転写して粘着シートを製造する方法
ダイシングされた電子部品を、本発明の転写用両面粘着シートの第1粘着剤層が受け取る工程(第1工程)
前記第1粘着剤層が受け取った電子部品を実装基板に転写する工程(第2工程)
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた四つ口フラスコに、2-エチルヘキシルアクリレート(2EHA)(日本触媒社製):100重量部、2-ヒドロキシエチルアクリレート(HEA)(東亞合成社製):4重量部、重合開始剤として2,2’-アゾビスイソブチロニトリル(和光純薬工業社製):0.02重量部、酢酸エチル:180重量部を仕込み、緩やかに攪拌しながら窒素ガスを導入し、フラスコ内の液温を65℃付近に保って6時間重合反応を行い、重量平均分子量56万のアクリル系共重合体(1)の溶液(固形分:35重量%)を調製した。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた四つ口フラスコに、ブチルアクリレート(日本触媒社製):95重量部、アクリル酸(東亜合成社製):5重量部、重合開始剤として2,2’-アゾビスイソブチロニトリル(和光純薬工業社製):0.2重量部、酢酸エチル:156重量部を仕込み、緩やかに攪拌しながら窒素ガスを導入し、フラスコ内の液温を63℃付近に保って10時間重合反応を行い、重量平均分子量70万のアクリル系共重合体(2)の溶液(固形分:40重量%)を調製した。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた四つ口フラスコに、80%アクリル酸(AA)(大阪有機化学工業社製):2.8重量部、2-エチルヘキシルアクリレート(2EHA)(日本触媒社製):44重量部、酢酸ビニル:35.2重量部(デンカ社製)、トルエン:20重量部を仕込み緩やかに攪拌しながら窒素ガスを導入し1時間撹拌した。その後、トルエン:96重量部にて稀釈した重合開始剤としてナイパーBW:0.2重量部(日油社製)を滴下し、フラスコ内の液温を40℃付近に保った。その後フラスコ内の液温を60℃に昇温し8時間重合反応を行い、次いで95℃に昇温し4時間撹拌し、重量平均分子量56万のアクリル系共重合体(3)の溶液(固形分:35重量%)を調製した。
ポリオールとして、OH基を3個有するポリオールであるプレミノールS3011(旭硝子株式会社製、Mn=10000)85重量部、OH基を3個有するポリオールであるサンニックスGP-3000(三洋化成株式会社製、Mn=3000)13重量部、OH基を3個有するポリオールであるサンニックスGP-1000(三洋化成株式会社製、Mn=1000)2重量部、多官能イソシアネート系化合物として多官能脂環族系イソシアネート化合物であるコロネートHX(日本ポリウレタン工業株式会社製)18重量部、触媒(日本化学産業株式会社製、商品名:ナーセム第2鉄)0.1重量部、劣化防止剤としてIrganox1010(BASF製)0.5重量部、脂肪酸エステルとして2-エチルヘキサン酸セチル(日清オイリオグループ株 式会社製、商品名:サラコス816T、Mn=368)5重量部、フッ素系界面活性剤としてメガファックF-571(DIC社製)0.2重量部を配合し、希釈溶剤として酢酸エチルを加えて混合攪拌を行い、ウレタン系粘着剤組成物(2)を製造した。
(転写用両面粘着シートの作製)
シリコーン系粘着剤1(付加反応型シリコーン系粘着剤、商品名「X-40-3306」、信越化学工業株式会社製):100重量部、白金系触媒1(商品名「CAT-PL-50T」、信越化学工業株式会社製):1.4重量部、シリコーン系剥離剤1(ジメチルポリシロキサンを主成分とした付加反応型のシリコーン系剥離剤、商品名「KS-776A」、信越化学工業株式会社製):5重量部を加え、全体の固形分が25重量%となるようにトルエンで稀釈し、ディスパーで混合してシリコーン系粘着剤組成物(シリコーン系粘着剤組成物1)を調製した。
基材フィルム(1)(一方の面がシリコーンプライマー処理されたポリエステルフィルム、厚み75μm、商品名「ダイアホイル MRF#75」、三菱樹脂株式会社製)のシリコーンプライマー処理された面に、シリコーン系粘着剤組成物1を乾燥後の糊厚みが10μmとなるように塗布し、乾燥温度120℃、乾燥時間5分の条件でキュアーして乾燥した。このようにして基材フィルム(1)のシリコーンプライマー処理層上にシリコーン系粘着剤層(1)を有するフィルムを得た。
なお、シリコーン系粘着フィルムの粘着面上には、セパレータ(1)(剥離処理されていないポリエチレンテレフタレートフィルム、厚み25μm、商品名「ルミラーS10#25」、東レ社製)を貼り合わせ、シリコーン系粘着剤層を保護し、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層〕/〔基材フィルム(1)層〕〕の積層構造を有する積層体(1)を得た。
次いで、製造例1で得られたアクリル系共重合体(1)の溶液に、その固形分100重量部に対して、架橋剤としてコロネートHX(東ソー社製)を固形分換算で4.0重量部、架橋触媒としてエンビライザーOL-1(東京ファインケミカル社製)を固形分換算で0.02重量部を加え、全体の固形分が25重量%となるようにトルエンで希釈し、ディスパーで攪拌したアクリル系粘着剤組成物をセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)の剥離処理層側にファウンテンロールで乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥した。このようにして、セパレータ(2)上にアクリル系粘着剤層(1)を形成した。
次いで、アクリル系粘着剤層(1)の表面に、上記で得られた積層体(1)の基材フィルム(1)側(シリコーンプライマー非処理面)を貼り合わせ、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
製造例2にて得られたアクリル系共重合体(2)の固形分100重量部に対して、架橋剤としてTETRAD-C(三菱瓦斯化学社製)を固形分換算で6重量部を加え、全体の固形分が25重量%となるように酢酸エチルで希釈し、ディスパーで攪拌し、得られたアクリル系粘着剤組成物をセパレータ(2)に塗工した以外は、実施例1と同様にして、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(2)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
製造例1にて得られたアクリル系共重合体(1)の溶液に、その固形分100重量部に対して、架橋剤としてコロネートHXに代えてコロネートL(東ソー社製)を固形分換算で4.0重量部加えた以外は、実施例1と同様にして、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(3)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
製造例3にて得られたアクリル系共重合体(3)の溶液に、その固形分100重量部に対して、架橋剤としてTETRAD-C(三菱瓦斯化学社製)を固形分換算で2.0重量部を加え全体の固形分が25重量%となるようにメチルエチルケトンで稀釈し、ディスパーで撹拌し、得られたアクリル系粘着剤組成物をセパレータ(2)に塗工した以外は、実施例1と同様にして、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(4)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
プレポリマータイプのウレタン系粘着剤組成物(1)として、サイアバインSH-109(トーヨーケム株式会 社製)の溶液に、その固形分100重量部に対して、架橋剤としてコロネートHX(東ソー社製)を固形分換算で4.0重量部、軽剥離化剤としてサラコス913(日清オイリオ社製)を固形分換算で10重量部、フッ素系界面活性剤メガファックF-571(DIC社製)1重量部、劣化防止剤としてIrgacure1010(BASF社製)0.5重量部加え全体の固形分は20重量%となるように酢酸エチルで稀釈しディズーアで撹拌し、得られたプレポリマータイプのウレンタン粘着剤溶液を基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたウレタン系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、ウレタン系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔ウレタン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(2)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
製造例2にて得られたアクリル系共重合体(2)の固形分100重量部に対して、架橋剤としてTETRAD-C(三菱瓦斯化学社製)を固形分換算で0.01重量部を加え、全体の固形分が25重量%となるように酢酸エチルで希釈し、ディスパーで攪拌し、得られたアクリル系粘着剤組成物をセパレータ(2)に塗工した以外は、実施例1と同様にして、〔セパレータ(1)層〕/〔シリコーン系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(5)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
積層体(1)の代わりとして、熱硬化性ポリウレタン樹脂フィルム(東レ社製、厚さ100μmのポリウレタン樹脂フィルム(100%モジュラス=32MPa)が厚さ50μmの表面保護フィルムで保護されたもの)を用いる以外は、実施例1と同様にして、〔表面保護フィルム層〕/〔ポリウレタン樹脂フィルム層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面シートを得た。
シリコーン系粘着剤組成物1の代わりとして、実施例1にて用いたアクリル系粘着剤組成物を、基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたアクリル系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、アクリル系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔アクリル系粘着剤(1)層(第1粘着剤層)〕/〔基材フィルム(2)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
シリコーン系粘着剤組成物1の代わりとして、実施例2にて用いたアクリル系粘着剤組成物を、基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたアクリル系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、アクリル系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔アクリル系粘着剤(2)層(第1粘着剤層)〕/〔基材フィルム(2)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
シリコーン系粘着剤組成物1の代わりとして、実施例3にて用いたアクリル系粘着剤組成物を、基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたアクリル系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、アクリル系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔アクリル系粘着剤(3)層(第1粘着剤層)〕/〔基材フィルム(2)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面シートを得た。
シリコーン系粘着剤組成物1の代わりとして、実施例4にて用いたアクリル系粘着剤組成物を、基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたアクリル系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、アクリル系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔アクリル系粘着剤(4)層(第1粘着剤層)〕/〔基材フィルム(2)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面シートを得た。
製造例4にて得られたウレタン系粘着剤組成物(2)を、基材フィルム(2)(未処理PETフィルム、厚み75μm、商品名「ルミラーS10#75」、東レ社製)に、乾燥後の厚みが20μmとなるように塗布し、乾燥温度130℃、乾燥時間30秒の条件でキュアーして乾燥し、得られたウレタン系粘着フィルムの粘着面上にセパレータ(2)(剥離処理されたポリエチレンテレフタレートフィルム、厚み38μm、商品名「MRF#38」、三菱ケミカル社製)を貼り合わせ、ウレタン系粘着剤層を保護した以外は実施例1と同様にして、〔セパレータ(2)層〕/〔ウレタン系粘着剤(2)層(第1粘着剤層)〕/〔基材フィルム(1)層〕/〔アクリル系粘着剤(1)層(第2粘着剤層)〕/〔セパレータ(2)層〕の積層構造を有する転写用両面粘着シートを得た。
実施例及び比較例で得られた転写用両面粘着シートについて、以下の評価を行った。結果を表3、4に示す。
シリコンベアウェハ製法;CZ、電導型;P、不純物;B、厚み;750μm、抵抗率;1Ωcm~50Ωcm, 表面;ミラー、裏面;ミラー、結晶方位(100)、表面不純物Fe,Ni,Cu,Zn,Cr,Al,Na<1.0(×1010atoms/cm2))を下記表1に示す条件で厚みが500μmとなるようにバックグラインドし、バックグラインド後のウエハ表面にマスキング材をハンドローラーを用いて気泡を噛ませることなく貼付けした。なお、Siウエハの全体をマスキング材で覆う形で貼り付けを行った。
次いで、マスキング材の基材側から上記紫外線照射条件で紫外線を照射し、マスキング材の粘着剤層を硬化させた。その後、ウエハ裏面側にダイシング・ダイボンドフィルム(DUッ2495KS、日東電工社製)を貼付した。ダイシングテープの粘着剤面にはダイシングするためのダイシングリングを貼付した。貼付後、遮光22℃で30分放置した。その後、マスキング材を剥離し、下記表2に示す条件で、Siウエハ、および、ダイシングテープのブレードダイシングを行い、一辺1mm四方の複数のシリコンチップが配列固定したダイシング・ダイボンドフィルムを調製した。
<紫外線照射条件>
紫外線照射装置:日東精機社製、商品名:UM810
光源:高圧水銀灯
照射強度:50mW/cm2(測定機器:ウシオ社製、製品名「紫外線照度計UT-101」)
照射時間:6秒
積算光量:300mJ/cm2
落ちたシリコンチップを全て目視で確認し、マーキング位置に正確に落ちているか、ひっくり返ることなく落ちているかを確認し、以下の基準で評価した。
〇・・・全てマーキングに対し位置ズレ・ひっくり返ることなく落ちている。
△・・・5個以上マーキングに対し位置ズレ・ひっくり返ることなく落ちている。
×・・・全てマーキングに対し位置ズレまたはひっくり返り落ちている。
<PETフィルムに対する第1粘着剤層の初期粘着力の測定>
実施例及び比較例の転写用両面粘着シートを、幅25mm、長さ150mmに切断し、評価用サンプルとした。
第2粘着剤層のセパレータを剥離し、第2粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に貼り合わせた。その後、幅20mm、長さ100mmに切断したPETフィルム「商品名:ルミラーS10#25(東レ社製)」を、23℃×50%RHの環境下において、セパレータを剥離した第1粘着剤層に2.0kg1往復により貼り付けた。23℃×50%RHの環境下で30分間養生した後、万能引張試験機(ミネベア株式会社製、製品名:TCM-1kNB)を用い、剥離角度180度、引っ張り速度300mm/分で剥離し、粘着力を測定した。
実施例及び比較例の転写用両面粘着シートを、幅25mm、長さ150mmに切断し、評価用サンプルとした。
第2粘着剤層のセパレータを剥離し、粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に貼り合わせた。その後、幅20mm、長さ100mmに切断したPETフィルム「商品名:ルミラーS10#25(東レ社製)」を、23℃×50%RHの環境下において、セパレータを剥離した第1粘着剤層に2.0kg1往復により貼り付けた。23℃×50%RHの環境下で30分間養生した。
次いで、160℃の空気循環式恒温オーブンで5分間加熱し、取り出した。その後、23℃×50%RHの環境下で30分間放冷し万能引張試験機(ミネベア株式会社製、製品名:TCM-1kNB)を用い、剥離角度180度、引っ張り速度300mm/分で剥離し、粘着力を測定した。
実施例及び比較例の転写用両面シートを、幅25mm、長さ150mmに切断し、評価用サンプルとした。
23℃×50%RHの環境下において、評価用サンプルのセパレータを剥離した第2粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に、2.0kgローラー1往復により貼り付けた。23℃×50%RHの環境下で30分間養生した後、万能引張試験機(ミネベア株式会社製、製品名:TCM-1kNB)を用い、剥離角度180度、引っ張り速度300mm/分で剥離し、粘着力を測定した。
実施例及び比較例の転写用両面粘着シートを、幅25mm、長さ150mmに切断し、評価用サンプルとした。
23℃×50%RHの環境下において、評価用サンプルのセパレータを剥離した第2粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に、2.0kgローラー1往復により貼り付けた。23℃×50%RHの環境下で30分間養生した。
次いで、160℃の空気循環式恒温オーブンで5分間加熱し、取り出した。その後、23℃×50%RHの環境下で30分間放冷し万能引張試験機(ミネベア株式会社製、製品名:TCM-1kNB)を用い、剥離角度180度、引っ張り速度300mm/分で剥離し、粘着力を測定した。
実施例及び比較例の転写用両面粘着シートを、幅20mm、長さ50mmに切断し、評価用サンプルとした。
評価用サンプルの測定しない面の粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に、ハンドローラーで貼り合わせた。次いで測定する面についているセパレータを剥離し、タッキング試験機(レスカ社製、製品名:TAC-II)を用い、下記条件にてタック力(gf/5mmΦSUS)を測定した
<測定条件>
プローブ:5mmφSUS
押し込み/引抜速度:120mm/min
押し込み荷重:100gf
接触時間:3秒
実施例及び比較例の転写用両面粘着シートを、幅10mm、長さ10mmに切断し、評価用サンプルとした。
評価用サンプルの測定しない面の粘着剤層表面をガラス板(松浪硝子工業株式会社製、商品名:マイクロスライドガラスS)に、ハンドローラーで貼り合わせ固定し、次いで測定する面のセパレータを剥離し、超微小押し込み硬さ試験機(ELIONIX社製、製品名:ENT-NEXUS)を用い、下記条件にて表面力(μN)を測定した。
<測定条件>
使用圧子:ガラス球プローブ(ELIONIX社製、直径:1mm、BK7)
測定雰囲気:大気中
測定温度:30℃
接触光学式粗さ測定器(装置:Zygo社製New View 7300)を用い、対物レンズ50倍、内部レンズ2倍(測定視野(XY):70μm×50μm)でフィルムの糊表面の測定を行った。サンプルはHigh Pass処理をおこなった後にRa、Rz、Rmsのそれぞれの値を3箇所測定し平均値を測定値とした。
実施例及び比較例の転写用両面粘着シートの第1粘着剤層に対して、AFM(ブルカー・エイエックスエス社製、製品名「NanoScope V/Dimension Icon」)を用いて、観察・測定を行い、25℃における1Hz、1kHzの貯蔵弾性率、損失弾性率をそれぞれ求めた。測定モードはAFM・DMAモードを用い、以下の条件で測定を行った。
<測定設定>
測定領域 :5μm×5μm
測定点数 :32×32
アクチュエーター :1~20kHz掃引
ガラス板に対する第2粘着剤層の160℃5分後の粘着力の測定において以下基準にてガラスリワーク性を判断した。
〇:3N/25mm以下
△:3N/25mm超5N/25mm以下
×:5N/25mm超
PETフィルムに対する第1粘着剤層の160℃5分後の粘着力の測定において以下基準にて転写性を判断した。
〇:1000mN/25mm以下
△:1000N/25mm超5000mN/25mm未満
×:5000mN/25mm以上
〔付記1〕第1粘着剤層と、基材と、第2粘着剤層とがこの順に積層された転写用両面粘着シートであって、
前記第1粘着剤層は、低粘着性粘着剤層からなり、
前記第2粘着剤層は、剥離性粘着剤層からなる、転写用両面粘着シート。
〔付記2〕前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での貯蔵弾性率が、50MPa以下である、付記1に記載の転写用両面粘着シート。
〔付記3〕前記第1粘着剤層のAFM-DMAによる周波数1kHz、25℃での貯蔵弾性率が、100MPa以下である、付記1又は2に記載の転写用両面粘着シート。
〔付記4〕前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での貯蔵弾性率に対する前記第1粘着剤層のAFM-DMAによる周波数1kHz、25℃での貯蔵弾性率の割合が1よりも大きい、付記1~3のいずれか1つに記載の転写用両面粘着シート。
〔付記5〕前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での損失弾性率が、7MPa以下である、付記1~4のいずれか1つに記載の転写用両面粘着シート。
〔付記6〕前記第1粘着剤層のステンレス板(直径5mm)に対するタック力が、10~250gf/Φ5mmSUSである、付記1~5のいずれか1つに記載の転写用両面粘着シート。
〔付記7〕前記基材が、耐熱性樹脂を含む、付記1~6のいずれか1つに記載の転写用両面粘着シート。
〔付記8〕電子部品の実装基板上への実装方法であって、
ダイシングされた電子部品を、付記1~7のいずれか1つに記載の転写用両面粘着シートの第1粘着剤層が受け取る工程、
前記第1粘着剤層が受け取った電子部品を実装基板に転写する工程を含む、方法。
〔付記9〕前記転写用両面粘着シートの第2粘着剤層にキャリア基板が貼着されている、付記8に記載の方法。
〔付記10〕前記電子部品が、半導体チップである、付記8又は9に記載の方法。
10 基材
11 第1粘着剤層
12 第2粘着剤層
110,120 セパレータ
20 ダイシングテープ
21 電子部品
22 キャリア基板
23 ピン部材
30 実装基板
31 回路面
Claims (10)
- 第1粘着剤層と、基材と、第2粘着剤層とがこの順に積層された転写用両面粘着シートであって、
前記第1粘着剤層は、低粘着性粘着剤層からなり、
前記第2粘着剤層は、剥離性粘着剤層からなる、転写用両面粘着シート。 - 前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での貯蔵弾性率が、50MPa以下である、請求項1に記載の転写用両面粘着シート。
- 前記第1粘着剤層のAFM-DMAによる周波数1kHz、25℃での貯蔵弾性率が、100MPa以下である、請求項1又は2に記載の転写用両面粘着シート。
- 前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での貯蔵弾性率に対する前記第1粘着剤層のAFM-DMAによる周波数1kHz、25℃での貯蔵弾性率の割合が1よりも大きい、請求項1~3のいずれか1項に記載の転写用両面粘着シート。
- 前記第1粘着剤層のAFM-DMAによる周波数1Hz、25℃での損失弾性率が、7MPa以下である、請求項1~4のいずれか1項に記載の転写用両面粘着シート。
- 前記第1粘着剤層のステンレス板(直径5mm)に対するタック力が、10~250gf/Φ5mmSUSである、請求項1~5のいずれか1項に記載の転写用両面粘着シート。
- 前記基材が、耐熱性樹脂を含む、請求項1~6のいずれか1項に記載の転写用両面粘着シート。
- 電子部品の実装基板上への実装方法であって、
ダイシングされた電子部品を、請求項1~7のいずれか1項に記載の転写用両面粘着シートの第1粘着剤層が受け取る工程、
前記第1粘着剤層が受け取った電子部品を実装基板に転写する工程を含む、方法。 - 前記転写用両面粘着シートの第2粘着剤層にキャリア基板が貼着されている、請求項8に記載の方法。
- 前記電子部品が、半導体チップである、請求項8又は9に記載の方法。
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JP2001085360A (ja) * | 1999-09-09 | 2001-03-30 | Lintec Corp | 電子部品の貼着方法およびそのための粘着テープの切り込み形成方法 |
JP2003324142A (ja) * | 2002-04-30 | 2003-11-14 | Lintec Corp | 半導体ウエハの処理方法およびそのための半導体ウエハの転写装置 |
JP2004186279A (ja) * | 2002-11-29 | 2004-07-02 | Sekisui Chem Co Ltd | 電子部品の3次元実装方法 |
JP2005263876A (ja) * | 2004-03-16 | 2005-09-29 | Lintec Corp | 両面粘着シートおよび脆質部材の転写方法 |
JP2017031331A (ja) * | 2015-08-03 | 2017-02-09 | ニッタ株式会社 | タッチセンサ転写用感温性粘着テープ |
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JP2001085360A (ja) * | 1999-09-09 | 2001-03-30 | Lintec Corp | 電子部品の貼着方法およびそのための粘着テープの切り込み形成方法 |
JP2003324142A (ja) * | 2002-04-30 | 2003-11-14 | Lintec Corp | 半導体ウエハの処理方法およびそのための半導体ウエハの転写装置 |
JP2004186279A (ja) * | 2002-11-29 | 2004-07-02 | Sekisui Chem Co Ltd | 電子部品の3次元実装方法 |
JP2005263876A (ja) * | 2004-03-16 | 2005-09-29 | Lintec Corp | 両面粘着シートおよび脆質部材の転写方法 |
JP2017031331A (ja) * | 2015-08-03 | 2017-02-09 | ニッタ株式会社 | タッチセンサ転写用感温性粘着テープ |
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