WO2022138458A1 - 衝撃吸収粘着シート - Google Patents
衝撃吸収粘着シート Download PDFInfo
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- WO2022138458A1 WO2022138458A1 PCT/JP2021/046581 JP2021046581W WO2022138458A1 WO 2022138458 A1 WO2022138458 A1 WO 2022138458A1 JP 2021046581 W JP2021046581 W JP 2021046581W WO 2022138458 A1 WO2022138458 A1 WO 2022138458A1
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- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- adhesive layer
- adhesive sheet
- electronic component
- Prior art date
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- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- JAYXSROKFZAHRQ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC=CC=1)CC1CO1 JAYXSROKFZAHRQ-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229940065472 octyl acrylate Drugs 0.000 description 1
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- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
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- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- AAYRWMCIKCRHIN-UHFFFAOYSA-N propane-1-sulfonic acid;prop-2-enamide Chemical compound NC(=O)C=C.CCCS(O)(=O)=O AAYRWMCIKCRHIN-UHFFFAOYSA-N 0.000 description 1
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- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
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- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
-
- 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
- H01L21/67—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
-
- 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
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
-
- 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
-
- 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
- C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
- C09J2301/502—Additional features of adhesives in the form of films or foils characterized by process specific features process for debonding adherents
Definitions
- the present invention relates to a shock absorbing adhesive sheet. More specifically, the present invention relates to a shock absorbing pressure-sensitive adhesive sheet that can be suitably used for transfer of small electronic components such as semiconductor chips and LED 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).
- laser transfer As a means for solving the above problems, a technique called laser transfer is being studied (see, for example, Patent Document 2).
- small electronic components such as semiconductor chips (for example, squares with a side of 100 ⁇ m or less) are arranged in a grid pattern on a temporary fixing material, and the surface on which the electronic components are arranged is arranged downward. ..
- a transfer substrate for transferring (receiving) the electronic component is arranged with a gap facing the surface on which the electronic component of the temporary fixing material is arranged.
- the temporary fixing is released, the electronic component is peeled off, and the electronic component is dropped onto the transfer substrate to transfer the component.
- the electronic components transferred to the transfer board can be transferred to another carrier board and mounted on the mounting board, or can be mounted by transferring directly from the transfer board to the mounting board.
- the present invention has been made in view of the above problems, and an object thereof is that even if the shock absorbing layer is made thin, the shock due to a collision of an electronic component or the like can be sufficiently absorbed, and the electronic component is received without damage or misalignment. It is to provide a shock absorbing adhesive sheet that can.
- a first aspect of the present invention provides a shock absorbing pressure-sensitive adhesive sheet having at least one pressure-sensitive adhesive layer.
- Sa ⁇ 100) is 10% or more.
- Thermomechanical analysis (TMA) Probe diameter: 1.0 mm Mode: Needle insertion mode Pushing load: 0.05N Measurement atmosphere temperature: -40 ° C Pushing load time: 20 minutes
- the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention can be suitably used as a transfer substrate in a laser transfer step.
- the transfer of electronic components is completed on an optical time scale, so the impact mitigation characteristics of the pressure-sensitive adhesive on this time scale are important.
- the optical time scale correlates with the frequency at which the laser beam is swept, and is, for example, 100 kHz.
- the physical properties of the pressure-sensitive adhesive in the frequency range of 100 kHz correspond to the physical characteristics of the pressure-sensitive adhesive in the low temperature region of -40 ° C according to the temperature-time conversion rule. It means that the relaxation characteristics are excellent.
- thermomechanical analysis TMA
- the above ratio (sinking depth / thickness ⁇ 100) when a load is applied to the pressure-sensitive adhesive layer at ⁇ 40 ° C. can be used as an index of impact mitigation characteristics.
- the configuration that the above ratio (sinking depth / thickness ⁇ 100) in the thermomechanical analysis (TMA) at -40 ° C is 10% or more is due to the collision of electronic components even if the adhesive layer is thinned. It is preferable in that it can sufficiently absorb impact and can receive electronic components without damage or misalignment.
- the ratio is preferably 15% or more, preferably 20% or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, or 80 from the viewpoint of sufficiently absorbing the impact caused by the collision of electronic parts. It may be% or more.
- the probe tack value of the pressure-sensitive adhesive layer at room temperature is preferably 10 N / cm 2 or more and 42 N / cm 2 or less.
- the configuration with a probe tack value of 10 N / cm 2 or more can sufficiently absorb the impact caused by a collision with an adhesive layer such as an electronic component, and can suppress misalignment and inside out due to bouncing of the electronic component at the time of collision.
- the probe tack value is preferably 13 N / cm 2 or more, and may be 16 N / cm 2 or more, or 19 N / cm 2 or more, from the viewpoint of suppressing misalignment and turning over of electronic components.
- the configuration in which the probe tack value is 42 N / cm 2 or less is preferable from the viewpoint of preventing the adhesive from sticking to the received electronic component and the adhesive residue, and is 40 N / cm 2 or less or 35 N / cm 2 or less. There may be.
- the transfer of electronic components is completed on an optical time scale, so the impact mitigation characteristics of the pressure-sensitive adhesive on this time scale are important.
- the optical time scale correlates with the frequency at which the laser beam is swept, and is, for example, 100 kHz. When converted to a time scale, it is about 10 microseconds, and the adhesive needs to be deformed in response to an impact on this time scale.
- the common logarithm (Log 10 G') of the storage elastic modulus (Pa) at a frequency of 100 kHz and 25 ° C. of the pressure-sensitive adhesive layer is 7.5 or less. preferable.
- the configuration in which the common logarithm of the storage elastic modulus is 7.5 or less can sufficiently absorb the impact caused by the collision with the pressure-sensitive adhesive layer of the electronic component, and causes the electronic component to be displaced or turned inside out due to the bounce at the time of collision. It is preferable in that it can be suppressed.
- the common logarithm of the storage elastic modulus is preferably 7.4 or less, even if it is 7.3 or less, 7.2 or less, 7.1 or less, or 7 or less. good.
- the loss coefficient (tan ⁇ ) of the pressure-sensitive adhesive layer at a frequency of 100 kHz and 25 ° C. is preferably 0.8 or more.
- the pressure-sensitive adhesive layer exhibits excellent damping property on an optical time scale, and can sufficiently absorb the impact due to collision with the pressure-sensitive adhesive layer such as an electronic component. It is preferable in that it can suppress misalignment and flipping due to bouncing of electronic parts at the time of collision.
- the loss coefficient is preferably 0.95 or more, and may be 1.2 or more.
- the adhesive strength of the pressure-sensitive adhesive layer to stainless steel at room temperature is preferably 0.01 N / 20 mm or more and 4.2 N / 20 mm or less.
- the structure in which the adhesive force of the pressure-sensitive adhesive layer on stainless steel at room temperature is 0.01 N / 20 mm or more is preferable in that it suppresses and retains misalignment when transporting electronic parts on the shock-absorbing pressure-sensitive adhesive sheet.
- the adhesive strength is more preferably 0.03 N / 20 mm or more, and may be 0.05 N / 20 mm or more.
- the structure in which the adhesive force of the pressure-sensitive adhesive layer on stainless steel at room temperature is 4.2 N / 20 mm or less is a transferability when an electronic component on the shock-absorbing pressure-sensitive adhesive sheet is transferred to another carrier substrate or mounting substrate. From the viewpoint, it is preferable, and it may be 3.0 N / 20 mm or less, or 2.0 N / 20 mm or less.
- the pressure-sensitive adhesive force means the pressure-sensitive adhesive force after radiation curing.
- the adhesive strength of the pressure-sensitive adhesive layer to stainless steel at room temperature is more preferably 1 N / 20 mm or less.
- the configuration in which the adhesive force of the adhesive layer on stainless steel is 1 N / 20 mm or less improves the transferability of the electronic component on the shock absorbing adhesive sheet when it is transferred to another carrier substrate or mounting substrate, and the electronic component It is preferable from the viewpoint of suppressing adhesive residue, and may be 0.75 N / 20 mm or less, or 0.5 N / 20 mm or less.
- the pressure-sensitive adhesive force means the pressure-sensitive adhesive force after radiation curing.
- the pressure-sensitive adhesive layer is preferably formed from a radiation-curable pressure-sensitive adhesive.
- the configuration in which the pressure-sensitive adhesive layer is formed from a radiation-curable pressure-sensitive adhesive is such that the pressure-sensitive adhesive sheet on the first side surface of the present invention is cured by irradiation after receiving an electronic component. It is preferable from the viewpoint that the adhesion to the electronic component can be lowered, the transferability of the received electronic component to another carrier substrate or mounting substrate can be improved, and the adhesive residue of the electronic component can be suppressed.
- the thickness of the pressure-sensitive adhesive layer is preferably 1 ⁇ m or more and 200 ⁇ m or less.
- the configuration in which the thickness of the pressure-sensitive adhesive layer is 1 ⁇ m or more is preferable from the viewpoint of preventing the pressure-sensitive adhesive from being lost from the pressure-sensitive adhesive sheet.
- the thickness of the pressure-sensitive adhesive layer is preferably 5 ⁇ m or more, and may be 10 ⁇ m or more, 20 ⁇ m or more, or 30 ⁇ m or more.
- the configuration in which the thickness of the pressure-sensitive adhesive layer is 200 ⁇ m or less is preferable from the viewpoint of transferability when the electronic component on the shock-absorbing pressure-sensitive adhesive sheet is transferred to another carrier substrate or mounting substrate, and the thickness is 150 ⁇ m or less and 100 ⁇ m or less. There may be.
- the impact absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention preferably has at least one layer of a base material. It is preferable that the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention has a base material in addition to the pressure-sensitive adhesive layer, so that stability and handleability when receiving electronic components are improved.
- the base material is preferably formed of a polyester film from the viewpoint of stability and handleability when receiving electronic components.
- the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention is preferably used for receiving the electronic component arranged on the temporary fixing material in the pressure-sensitive adhesive layer. Since the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention has the pressure-sensitive adhesive layer of the present invention, it can sufficiently absorb the shock caused by the collision with the pressure-sensitive adhesive layer such as an electronic component, and is caused by the bounce of the electronic component at the time of collision. It is possible to suppress misalignment and turning over.
- the surface on which the electronic component of the temporary fixing material is arranged and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer of the shock-absorbing pressure-sensitive adhesive sheet face each other to provide a gap. It is preferable to be arranged. This configuration is preferable in that the positional relationship between the substrate and the impact absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention can be controlled, and electronic components can be arranged at a desired position on the shock absorbing pressure-sensitive adhesive sheet.
- the second aspect of the present invention also provides a method for processing electronic components.
- the method for processing an electronic component on the second side surface of the present invention is a step of receiving the electronic component arranged on the temporary fixing material on the adhesive surface of the adhesive layer of the shock absorbing adhesive sheet on the first side surface of the present invention (first). 1 step) is included.
- the impact absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention can sufficiently absorb the impact caused by the collision with the pressure-sensitive adhesive layer such as the electronic component, and at the time of collision. It is possible to suppress misalignment and flipping due to the bouncing of electronic components.
- the surface on which the electronic component is arranged on the temporary fixing material and the adhesive surface of the pressure-sensitive adhesive layer of the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention are preferably arranged so as to face each other with a gap.
- This configuration is preferable in that the positional relationship between the temporary fixing material and the shock absorbing pressure-sensitive adhesive sheet on the first side surface of the present invention can be controlled, and the electronic component can be arranged at a desired position of the shock absorbing pressure-sensitive adhesive sheet.
- the method for processing the electronic component on the second side surface of the present invention further includes a step of arranging the electronic component on the shock absorbing adhesive sheet on another adhesive sheet or another substrate (second step) and the impact. It is preferable to include a step (third step) of peeling the electronic component from the adhesive surface of the pressure-sensitive adhesive layer of the absorbent pressure-sensitive adhesive sheet.
- the method for processing an electronic component on the second aspect of the present invention can efficiently transfer the electronic component by including the second step and the third step.
- the shock-absorbing pressure-sensitive adhesive sheet of the present invention can sufficiently absorb the shock caused by collision with the pressure-sensitive adhesive layer such as electronic parts, and the electronic parts are displaced or turned inside out due to the bounce of the electronic parts at the time of collision. It is also excellent in transferability of the received electronic component to another carrier board or mounting board. Therefore, it can be suitably used in a process of efficiently transferring an electronic component onto another carrier board or mounting board.
- FIG. 3 is a schematic cross-sectional view showing a first step in an embodiment of a method for processing an electronic component using the shock absorbing adhesive sheet shown in FIG. 1. It is sectional drawing which shows the 2nd process and 3rd process in one Embodiment of the processing method of the electronic component using the shock absorption adhesive sheet shown in FIG.
- the impact absorbing pressure-sensitive adhesive sheet of the present invention has at least one pressure-sensitive adhesive layer.
- the ratio of the sinking depth to the thickness of the pressure-sensitive adhesive layer (subduction depth / thickness ⁇ 100) by thermomechanical analysis (TMA) under the following conditions with respect to the pressure-sensitive adhesive layer is It is 10% or more.
- TMA thermomechanical analysis
- the pressure-sensitive adhesive layer may be referred to as "the pressure-sensitive adhesive layer of the present invention”.
- the "impact absorbing pressure-sensitive adhesive sheet of the present invention” may be simply referred to as “the pressure-sensitive adhesive sheet of the present invention”.
- the "adhesive sheet” shall include the meaning of "adhesive tape”. That is, the impact absorbing adhesive sheet of the present invention may be an adhesive tape having a tape-like form.
- the shock-absorbing adhesive sheet of the present invention is used in a processing technique for transferring a small electronic component such as a semiconductor chip or an LED chip to a mounting substrate such as a circuit board, and the electronic component is applied to the adhesive layer of the present invention. Is to be placed.
- a small electronic component such as a semiconductor chip or an LED chip
- a mounting substrate such as a circuit board
- the electronic component is applied to the adhesive layer of the present invention. Is to be placed.
- the shock absorbing pressure-sensitive adhesive sheet of the present invention for transferring electronic parts it is possible to arrange a plurality of electronic parts on the pressure-sensitive adhesive layer of the present invention on an optical time scale, and it is necessary to pick them up individually. do not have.
- the electronic components arranged on the pressure-sensitive adhesive layer of the present invention can be transferred to another carrier substrate and mounted on the mounting substrate, or can be directly transferred from the shock-absorbing pressure-sensitive adhesive sheet of the present invention to the mounting substrate. Therefore, the manufacturing efficiency can be significantly improved.
- the form of the shock absorbing adhesive sheet of the present invention is not particularly limited as long as it has an adhesive surface (adhesive layer surface) formed by the adhesive layer of the present invention.
- it may be a single-sided adhesive sheet in which only one side is an adhesive surface, or a double-sided adhesive sheet in which both sides are adhesive surfaces.
- the shock absorbing pressure-sensitive adhesive sheet of the present invention is a double-sided pressure-sensitive adhesive sheet
- the shock-absorbing pressure-sensitive adhesive sheet of the present invention may have a form in which both pressure-sensitive adhesive surfaces are provided by the pressure-sensitive adhesive layer of the present invention.
- One adhesive surface is provided by the adhesive layer of the present invention, and the other adhesive surface may be referred to as an adhesive layer other than the adhesive layer of the present invention (in the present specification, "another adhesive layer”). ) May have the form provided by.
- the shock-absorbing pressure-sensitive adhesive sheet of the present invention may be a so-called "base material-less type” pressure-sensitive adhesive sheet having no base material (base material layer), or may be a type of pressure-sensitive adhesive sheet having a base material. ..
- the "base material-less type” adhesive sheet may be referred to as “base material-less adhesive sheet”
- the type of adhesive sheet having a base material may be referred to as “base material-based adhesive sheet”.
- Examples of the base material-less pressure-sensitive adhesive sheet include a double-sided pressure-sensitive adhesive sheet composed of only the pressure-sensitive adhesive layer of the present invention, a pressure-sensitive adhesive layer of the present invention and another pressure-sensitive adhesive layer (a pressure-sensitive adhesive layer other than the pressure-sensitive adhesive layer of the present invention). Examples thereof include a double-sided adhesive sheet made of. Examples of the pressure-sensitive adhesive sheet with a base material include a single-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer of the present invention on one side of the base material, and a double-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer of the present invention on both sides of the base material.
- Examples thereof include a double-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer of the present invention on one surface side of the base material and another pressure-sensitive adhesive layer on the other side surface.
- base material base material layer
- the above-mentioned “base material (base material layer)” is a support, and is a portion that receives electronic components together with the pressure-sensitive adhesive layer when the shock-absorbing pressure-sensitive adhesive sheet of the present invention is used.
- the separator (peeling liner) that is peeled off when the adhesive sheet is used is not included in the above-mentioned base material.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of the shock absorbing pressure-sensitive adhesive sheet of the present invention, in which 1 is a shock absorbing pressure-sensitive adhesive sheet, 10 is an adhesive layer, and 11 is a base material.
- the shock absorbing pressure-sensitive adhesive sheet 1 has a laminated structure in which the pressure-sensitive adhesive layer 10 and the base material 11 are laminated.
- the shock absorbing adhesive sheet 1 is used in a processing technique for mounting small electronic components such as semiconductor chips and LED chips on a mounting substrate such as a circuit board, and arranges the electronic components on the adhesive layer 10. be. That is, in the shock absorbing pressure-sensitive adhesive sheet 1, the pressure-sensitive adhesive layer 10 is composed of the pressure-sensitive adhesive layer of the present invention, and is a pressure-sensitive adhesive layer for arranging and holding electronic components. Specifically, the pressure-sensitive adhesive layer 10 is suitably used for separating the electronic component temporarily fixed to the substrate from the substrate and receiving the separated electronic component.
- FIG. 2 is a schematic cross-sectional view showing another embodiment of the shock absorbing pressure-sensitive adhesive sheet of the present invention, in which 2 is a shock absorbing pressure-sensitive adhesive sheet, 20 is a pressure-sensitive adhesive layer, 21 is a base material, and 22 is a pressure-sensitive adhesive layer. ..
- the shock absorbing pressure-sensitive adhesive sheet 2 has a laminated structure in which the pressure-sensitive adhesive layer 20, the base material 21, and the pressure-sensitive adhesive layer 22 are laminated.
- the pressure-sensitive adhesive layer 20 is composed of the pressure-sensitive adhesive layer of the present invention, and is a pressure-sensitive adhesive layer for arranging and holding electronic components.
- the pressure-sensitive adhesive layer 22 may be composed of the pressure-sensitive adhesive layer of the present invention or may be composed of a pressure-sensitive adhesive layer other than the pressure-sensitive adhesive layer of the present invention. ..
- the ratio of the sinking depth to the thickness of the pressure-sensitive adhesive layer (subduction depth / thickness ⁇ 100) by thermomechanical analysis (TMA) under the above conditions is 10% or more.
- TMA thermomechanical analysis
- the shock absorbing pressure-sensitive adhesive sheet of the present invention can be suitably used as a transfer substrate in a laser transfer process.
- the transfer of electronic components is completed on an optical time scale, so the impact mitigation characteristics of the pressure-sensitive adhesive on this time scale are important.
- the optical time scale correlates with the frequency at which the laser beam is swept, and is, for example, 100 kHz.
- the physical properties of the pressure-sensitive adhesive in the frequency range of 100 kHz correspond to the physical characteristics of the pressure-sensitive adhesive in the low temperature region of -40 ° C according to the temperature-time conversion rule. It means that the relaxation characteristics are excellent.
- TMA thermomechanical analysis
- the above ratio (sinking depth / thickness ⁇ 100) when a load is applied to the pressure-sensitive adhesive layer at ⁇ 40 ° C. can be used as an index of impact mitigation characteristics.
- thermomechanical analysis (TMA) at -40 ° C is 10% or more is due to collision of electronic parts even if the adhesive layer is thinned. It is preferable in that it can sufficiently absorb impact and can receive electronic components without damage or misalignment. From the viewpoint of sufficiently absorbing the impact caused by the collision of electronic parts, the ratio is preferably 15% or more, 20% or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, or. It may be 80% or more. From the viewpoint of transferability of the received electronic component to another carrier substrate or mounting substrate, the above ratio is preferably 95% or less, and may be 90% or less.
- the above ratio (sinking depth / thickness ⁇ 100) can be measured, for example, by the method described in Examples described later, and the type and composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. It can be adjusted by adjusting the type and amount of the cross-linking agent used.
- the probe tack value of the pressure-sensitive adhesive layer of the present invention at room temperature is preferably 10 N / cm 2 or more and 42 N / cm 2 or less.
- the configuration with a probe tack value of 10 N / cm 2 or more can sufficiently absorb the impact caused by a collision with an adhesive layer such as an electronic component, and can suppress misalignment and inside out due to bouncing of the electronic component at the time of collision.
- the probe tack value is preferably 13 N / cm 2 or more, and may be 16 N / cm 2 or more, or 19 N / cm 2 or more, from the viewpoint of suppressing misalignment and turning over of electronic components.
- the configuration in which the probe tack value is 42 N / cm 2 or less is preferable from the viewpoint of preventing the adhesive from sticking to the received electronic component and the adhesive residue, and is 40 N / cm 2 or less or 35 N / cm 2 or less. There may be.
- the probe tack value can be measured by the method described in Examples described later, and the type and composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the type and use of the cross-linking agent, and the use thereof. It can be adjusted by adjusting the amount or the like.
- the transfer of electronic components is completed on an optical time scale, so the impact mitigation characteristics of the pressure-sensitive adhesive on this time scale are important.
- the optical time scale correlates with the frequency at which the laser beam is swept, and is, for example, 100 kHz. When converted to a time scale, it is about 10 microseconds, and the adhesive needs to be deformed in response to an impact on this time scale.
- the common logarithm (Log 10 G') of the storage elastic modulus (Pa) at a frequency of 100 kHz and 25 ° C. of the pressure-sensitive adhesive layer of the present invention is preferably 7.5 or less.
- the configuration in which the common logarithm of the storage elastic modulus is 7.5 or less can sufficiently absorb the impact caused by the collision with the pressure-sensitive adhesive layer of the electronic component, and causes the electronic component to be displaced or turned inside out due to the bounce at the time of collision. It is preferable in that it can be suppressed.
- the common logarithm of the storage elastic modulus is preferably 7.4 or less, even if it is 7.3 or less, 7.2 or less, 7.1 or less, or 7 or less. good.
- the common logarithm of the storage elastic modulus is preferably 4 or more, and may be 5 or more, from the viewpoint of preventing the position of the received electronic component from being displaced when being transported on the shock absorbing adhesive sheet.
- the loss coefficient (tan ⁇ ) of the pressure-sensitive adhesive layer at a frequency of 100 kHz and 25 ° C. is preferably 0.8 or more.
- the pressure-sensitive adhesive layer exhibits excellent damping property on an optical time scale, and can sufficiently absorb the impact due to collision with the pressure-sensitive adhesive layer such as an electronic component. It is preferable in that it can suppress misalignment and flipping due to bouncing of electronic parts at the time of collision.
- the loss coefficient is preferably 0.95 or more, and may be 1.2 or more.
- the loss coefficient is preferably 2.8 or less, and may be 2.3 or less, from the viewpoint of preventing the position of the received electronic component from shifting on the shock absorbing adhesive sheet.
- the impact mitigation characteristics of the pressure-sensitive adhesive in this temperature range are also important.
- the common logarithm (Log 10 G') of the storage elastic modulus (Pa) at a frequency of 1 Hz and ⁇ 40 ° C. of the pressure-sensitive adhesive layer of the present invention is preferably 8.5 or less.
- the configuration in which the common logarithm of the storage elastic modulus is 8.5 or less can sufficiently absorb the impact caused by the collision with the adhesive layer of the electronic component, and causes the electronic component to be displaced or turned inside out due to the bounce at the time of collision. It is preferable in that it can be suppressed.
- the common logarithm of the storage elastic modulus is preferably 8.4 or less, even if it is 8.3 or less, 8.2 or less, 8.1 or less, or 8 or less. good.
- the common logarithm of the storage elastic modulus is preferably 4 or more, and may be 5 or more, from the viewpoint of preventing the position of the received electronic component from being displaced when being transported on the shock absorbing adhesive sheet.
- the loss coefficient (tan ⁇ ) of the pressure-sensitive adhesive layer at a frequency of 1 Hz and ⁇ 40 ° C. is preferably 0.1 or more.
- the configuration in which the loss coefficient is 0.1 or more shows that the pressure-sensitive adhesive layer exhibits excellent damping properties at low temperatures, can sufficiently absorb the impact due to collision with the pressure-sensitive adhesive layer such as electronic components, and can sufficiently absorb electrons at the time of collision. It is preferable in that it can suppress misalignment and turning over due to the bouncing of parts.
- the loss coefficient is preferably 0.2 or more, and may be 0.3 or more, 0.4 or more, or 0.5 or more.
- the loss coefficient is preferably 2.2 or less, and may be 1.7 or less, from the viewpoint of preventing the position of the received electronic component from shifting on the shock absorbing adhesive sheet.
- the common logarithm and loss coefficient of the storage elastic modulus can be measured by, for example, the dynamic viscoelasticity measurement described in the examples below, and the type and composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. , It can be adjusted by adjusting the type and amount of the cross-linking agent used.
- the adhesive strength of the pressure-sensitive adhesive layer of the present invention to stainless steel at room temperature is preferably 0.01 N / 20 mm or more and 4.2 N / 20 mm or less.
- the structure in which the adhesive force of the pressure-sensitive adhesive layer on stainless steel at room temperature is 0.01 N / 20 mm or more is preferable in that the position shift of the received electronic component during transportation to the next step or the like is suppressed and held.
- the adhesive strength is more preferably 0.03 N / 20 mm or more, and may be 0.05 N / 20 mm or more.
- the configuration in which the adhesive force of the adhesive layer on stainless steel at room temperature is 4.2 N / 20 mm or less is preferable from the viewpoint of transferability of the received electronic component to another carrier substrate or mounting substrate, and is 3.0 N /. It may be 20 mm or less, or 2.0 N / 20 mm or less.
- the pressure-sensitive adhesive force means the pressure-sensitive adhesive force after radiation curing.
- the adhesive strength of the pressure-sensitive adhesive layer of the present invention to stainless steel at room temperature is more preferably 1N / 20 mm or less.
- the configuration in which the adhesive force of the adhesive layer on stainless steel at room temperature is 1 N / 20 mm or less improves the transferability of the received electronic component to another carrier substrate or mounting substrate, and suppresses the adhesive residue of the electronic component. It is preferable from the viewpoint that it can be used, and it may be 0.75 N / 20 mm or less, or 0.5 N / 20 mm or less. Further, the adhesive strength of the pressure-sensitive adhesive layer to stainless steel at room temperature may be 0.001 N / 20 mm or more, or 0.005 N / 20 mm or more.
- the pressure-sensitive adhesive force means the pressure-sensitive adhesive force after radiation curing.
- the pressure-sensitive adhesive layer of the present invention is preferably formed from a radiation-curable pressure-sensitive adhesive.
- the configuration in which the pressure-sensitive adhesive layer of the present invention is formed from a radiation-curable pressure-sensitive adhesive is such that after the shock-absorbing pressure-sensitive adhesive sheet of the present invention receives an electronic component, the pressure-sensitive adhesive layer is cured by irradiation with radiation to the electronic component. It is preferable from the viewpoint that the adhesiveness can be lowered, the transferability of the received electronic component to another carrier substrate or mounting substrate can be improved, and the adhesive residue of the electronic component can be suppressed.
- the radiation-curable pressure-sensitive adhesive can be realized, for example, by forming the radiation-curable pressure-sensitive adhesive with the "radiation-curable pressure-sensitive adhesive" described later.
- the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer on stainless steel before radiation curing at room temperature is 0.1 N / 20 mm or more. Is preferable.
- the configuration in which the adhesive force before radiation curing is 0.1 N / 20 mm or more is preferable in that it is possible to suppress misalignment and inside out due to bouncing of electronic components at the time of collision.
- the adhesive strength before radiation curing is more preferably 0.2 N / 20 mm or more, and may be 0.3 N / 20 mm or more, in that it is possible to suppress misalignment and inside out of the electronic component.
- the upper limit of the adhesive force before radiation curing is not particularly limited, but may be 20N / 20mm or less, 18N / 20mm or less, or 15N / 20mm or less.
- the adhesive strength can be measured by, for example, the adhesive strength measurement described in Examples described later, and the type and composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the type and amount of the cross-linking agent, and the like can be measured. Can be adjusted by adjusting. Further, when the pressure-sensitive adhesive layer is formed from a radiation-curable pressure-sensitive adhesive, the pressure-sensitive adhesive force after radiation curing can be further adjusted by adjusting the amount of radiation energy or the like.
- the thickness of the pressure-sensitive adhesive layer of the present invention is preferably 1 ⁇ m or more and 200 ⁇ m or less.
- the configuration in which the thickness of the pressure-sensitive adhesive layer of the present invention is 1 ⁇ m or more is preferable from the viewpoint of preventing the pressure-sensitive adhesive from being lost from the pressure-sensitive adhesive sheet.
- the thickness of the pressure-sensitive adhesive layer of the present invention is preferably 5 ⁇ m or more, and may be 10 ⁇ m or more, 20 ⁇ m or more, or 30 ⁇ m or more.
- the configuration in which the thickness of the pressure-sensitive adhesive layer of the present invention is 200 ⁇ m or less is preferable from the viewpoint of transferability when the electronic component on the shock-absorbing pressure-sensitive adhesive sheet is transferred to another carrier substrate or mounting substrate, and is 150 ⁇ m or less, 100 ⁇ m or less. It may be as follows.
- the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer of the present invention is not particularly limited, and is, for example, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a vinyl alkyl ether-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive.
- Examples thereof include pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, fluorine-based pressure-sensitive adhesives, and epoxy-based pressure-sensitive adhesives.
- an acrylic pressure-sensitive adhesive is preferable from the viewpoint of transparency, adhesiveness, cost, and ease of designing the pressure-sensitive adhesive. That is, the pressure-sensitive adhesive layer of the present invention is preferably an acrylic pressure-sensitive adhesive layer composed of an acrylic pressure-sensitive adhesive.
- the above-mentioned pressure-sensitive adhesive can be used alone or in combination of two or more.
- the acrylic pressure-sensitive adhesive layer contains an acrylic polymer as a base polymer.
- the acrylic polymer is a polymer containing an acrylic monomer (a monomer having a (meth) acryloyl group in the molecule) as a monomer component constituting the polymer.
- the acrylic polymer is preferably a polymer containing a (meth) acrylic acid alkyl ester as a monomer component constituting the polymer.
- the acrylic polymer can be used alone or in combination of two or more.
- the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer of the present invention may be in any form.
- the pressure-sensitive adhesive composition may be an emulsion type, a solvent type (solution type), an active energy ray curing type, a heat melting type (hot melt type), or the like.
- a solvent-type or active energy ray-curable pressure-sensitive adhesive composition is preferable because it is easy to obtain a pressure-sensitive adhesive layer having excellent productivity, optical properties and appearance.
- a solvent-type pressure-sensitive adhesive composition is preferable from the viewpoint of absorbing the impact caused by the collision of the electronic components and suppressing the displacement and turning over of the electronic components.
- the pressure-sensitive adhesive layer of the present invention is an acrylic-based pressure-sensitive adhesive layer containing an acrylic-based polymer as a base polymer, and is preferably formed by a solvent-type acrylic pressure-sensitive adhesive composition.
- the active energy rays include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, and electron beams, ultraviolet rays, and the like, and ultraviolet rays are particularly preferable. That is, the active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet-curable pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive composition (acrylic pressure-sensitive adhesive composition) for forming the acrylic pressure-sensitive adhesive layer is, for example, an acrylic pressure-sensitive adhesive composition containing an acrylic-based polymer as an essential component, or a simple material constituting the acrylic-based polymer.
- examples thereof include a mixture of weights (monomers) (sometimes referred to as a "monomer mixture") or an acrylic pressure-sensitive adhesive composition containing a partial polymer thereof as an essential component.
- the former include so-called solvent-type acrylic pressure-sensitive adhesive compositions.
- Examples of the latter include so-called active energy ray-curable acrylic pressure-sensitive adhesive compositions.
- the above-mentioned "monomer mixture” means a mixture containing a monomer component constituting a polymer.
- the above-mentioned "partial polymer” may also be referred to as a "prepolymer", and means a composition in which one or more of the monomer components in the monomer mixture are partially polymerized. do.
- the acrylic polymer is a polymer composed (formed) of an acrylic monomer as an essential monomer component (monomer component).
- the acrylic polymer is preferably a polymer composed (formed) of a (meth) acrylic acid alkyl ester as an essential monomer component. That is, the acrylic polymer preferably contains (meth) acrylic acid alkyl ester as a constituent unit.
- (meth) acrylic refers to "acrylic” and / or "methacrylic” (either or both of "acrylic” and “methacrylic"), and so on.
- the acrylic polymer is composed of one kind or two or more kinds of monomer components.
- (meth) acrylic acid alkyl ester as an essential monomer component, a (meth) acrylic acid alkyl ester having a linear or branched-chain alkyl group is preferably mentioned.
- the (meth) acrylic acid alkyl ester can be used alone or in combination of two or more.
- the (meth) acrylic acid alkyl ester having a linear or branched alkyl group is not particularly limited, and for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (.
- the (meth) acrylic acid alkyl ester having a linear or branched alkyl group is preferably a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 4 to 18 carbon atoms. , More preferably 2-ethylhexyl acrylate (2EHA), n-butyl acrylate (BA), lauryl acrylate (LA), lauryl methacrylate (LMA). Further, the (meth) acrylic acid alkyl ester having a linear or branched alkyl group can be used alone or in combination of two or more.
- EHA 2-ethylhexyl acrylate
- BA n-butyl acrylate
- LA lauryl acrylate
- LMA lauryl methacrylate
- the (meth) acrylic acid alkyl ester having a linear or branched alkyl group can be used alone or in combination of two or more.
- the ratio of the (meth) acrylic acid alkyl ester in all the monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, but it absorbs the impact due to the collision of the electronic component and the position of the electronic component shifts. From the viewpoint of suppressing turning over and turning over, the above-mentioned characteristics (particularly, the ratio of the sinking depth to the thickness of the pressure-sensitive adhesive layer by thermomechanical analysis (TMA) (sinking depth / thickness ⁇ 100)) are controlled. From the viewpoint, it is preferably 80% by weight or more, and may be 85% by weight or more, or 90% by weight or more.
- the upper limit of the ratio of the (meth) acrylic acid alkyl ester is also not particularly limited, but may be 99% by weight or less, or 98% by weight or less.
- the acrylic polymer may contain a copolymerizable monomer together with the (meth) acrylic acid alkyl ester as a monomer component constituting the polymer. That is, the acrylic polymer may contain a copolymerizable monomer as a constituent unit.
- the copolymerizable monomer may be used alone or in combination of two or more.
- the copolymerizable monomer is not particularly limited, but is a reaction point with a cross-linking agent described later, an isocyanate compound having an ultraviolet polymerizable carbon-carbon double bond and an isocyanate group as a second functional group, and the like.
- a monomer having a hydroxyl group in the molecule and a monomer having a carboxyl group in the molecule are preferably mentioned. That is, the acrylic polymer preferably contains a monomer having a hydroxyl group in the molecule as a constituent unit. Further, the acrylic polymer preferably contains a monomer having a carboxyl group in the molecule as a constituent unit.
- the monomer having a hydroxyl group in the molecule is a monomer having at least one hydroxyl group (hydroxyl group) in the molecule (inside one molecule), and is a polymerization having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Those having a sex functional group and having a hydroxyl group are preferably mentioned.
- the above-mentioned "monomer having a hydroxyl group in the molecule” may be referred to as "hydroxyl group-containing monomer".
- the hydroxyl group-containing monomer can be used alone or in combination of two or more.
- hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and (. Contains hydroxyl groups such as 6-hydroxyhexyl acrylate, (meth) hydroxyoctyl acrylate, (meth) hydroxydecyl acrylate, (meth) hydroxylauryl acrylate, (meth) acrylate (4-hydroxymethylcyclohexyl). Meta) Acrylic acid ester; Vinyl alcohol; Allyl alcohol and the like can be mentioned.
- hydroxyl group-containing monomer a hydroxyl group-containing (meth) acrylic acid ester is preferable, and 2-hydroxyethyl acrylate (HEA) and 4-hydroxybutyl acrylate (4HBA) are more preferable.
- the proportion of the hydroxyl group-containing monomer in all the monomer components (100% by weight) constituting the acrylic polymer is particularly limited. Although it is not, it becomes a reaction point with a cross-linking agent described later or an isocyanate compound having both an ultraviolet polymerizable carbon-carbon double bond and an isocyanate group as a second functional group, and controls the degree of cross-linking and radiation curability. From the viewpoint of transparency, control of adhesive strength, etc., it is preferably 0.5% by weight or more, more preferably 0.8% by weight or more, and further preferably 1% by weight or more.
- the upper limit of the proportion of the hydroxyl group-containing monomer is preferably 20% by weight or less, more preferably 18% by weight or less, and further preferably 15% by weight or less.
- the monomer having a carboxyl group in the molecule is a monomer having at least one carboxyl group in the molecule (inside one molecule), and is polymerizable with an unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Those having a functional group and a carboxyl group are preferably mentioned.
- the above-mentioned "monomer having a carboxyl group in the molecule” may be referred to as "monomer containing a carboxyl group”.
- the carboxyl group-containing monomer may be used alone or in combination of two or more.
- carboxyl group-containing monomer examples include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid. Further, the carboxyl group-containing monomer shall also include, for example, an acid anhydride group-containing monomer such as maleic anhydride and itaconic anhydride.
- (meth) acrylic acid is preferable, and acrylic acid (AA) is more preferable.
- the acrylic polymer contains the carboxyl group-containing monomer as a monomer component constituting the polymer
- the ratio of the carboxyl group-containing monomer to all the monomer components (100% by weight) constituting the acrylic polymer is determined.
- it serves as a reaction point with a cross-linking agent described later or an isocyanate compound having both an ultraviolet polymerizable carbon-carbon double bond and an isocyanate group as a second functional group, and controls the degree of cross-linking and radiation curability. It is preferably 0.5% by weight or more, more preferably 0.8% by weight or more, still more preferably 1% by weight or more, from the viewpoints of squeezing, transparency, control of adhesive force and the like.
- the upper limit of the proportion of the carboxyl group-containing monomer is preferably 20% by weight or less, more preferably 18% by weight or less, and further preferably 15% by weight or less.
- the total ratio of the hydroxyl group-containing monomer and the carboxyl group-containing monomer to the total monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, but is not particularly limited, but the cross-linking agent and ultraviolet-polymerizable carbon-carbon described later are not particularly limited. It is preferably 1% by weight or more from the viewpoint of a reaction point with an isocyanate compound having both a double bond and an isocyanate group as a second functional group, transparency, control of adhesive strength, and the like. It is preferably 3% by weight or more.
- the upper limit of the total of the above ratios is preferably 20% by weight or less, more preferably 15% by weight, from the viewpoint of obtaining a pressure-sensitive adhesive layer having appropriate flexibility and obtaining a pressure-sensitive adhesive layer having excellent transparency. % Or less.
- examples of the copolymerizable monomer include a polyfunctional monomer.
- examples of the polyfunctional monomer include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, and neopentyl.
- Glycoldi (meth) acrylate pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimethylolpropanetri (meth) acrylate, tetramethylol methanetri (meth) acrylate, Examples thereof include allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate.
- the polyfunctional monomer may be used alone or in combination of two or more.
- the ratio of the polyfunctional monomer to the total monomer component (100% by weight) constituting the acrylic polymer is determined.
- 0.5% by weight or less for example, more than 0% by weight and 0.5% by weight or less
- more preferably 0.2% by weight or less for example, more than 0% by weight and 0% by weight. 2% by weight or less).
- the above acrylic polymer is a monomer unit derived from one or more other monomers copolymerizable with (meth) acrylic acid ester, for example, from the viewpoint of modifying its cohesive force and heat resistance. It may be included.
- Other copolymerizable monomers for forming the monomer unit of the acrylic polymer include, for example, a nitrogen-containing monomer, an alicyclic structure-containing monomer, an epoxy group-containing monomer, a sulfonic acid group-containing monomer, and a phosphoric acid group-containing monomer.
- Examples of the nitrogen-containing monomer include acryloylmorpholine, acrylamide, N-vinylpyrrolidone, and acrylonitrile.
- Examples of the alicyclic structure-containing monomer include cyclopropyl (meth) acrylate, cyclobutyl (meth) acrylate, cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, cyclooctyl (meth) acrylate, and isobornyl. Examples thereof include (meth) acrylate and dicyclopentanyl (meth) acrylate.
- Examples of the epoxy 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-methylpropane sulfonic acid, (meth) acrylamide propane sulfonic acid, and (meth) acryloyloxynaphthalene sulfonic acid.
- phosphoric acid group-containing monomer examples include 2-hydroxyethylacryloyl phosphate.
- the acrylic polymer may contain, as a monomer component constituting the polymer, a monomer having a low glass transition temperature (Tg) when a homopolymer is formed (hereinafter, may be referred to as “low Tg monomer”). It is preferably contained.
- Tg monomer a monomer having a low glass transition temperature (Tg) when a homopolymer is formed
- Tg monomer glass transition temperature
- the pressure-sensitive adhesive containing the acrylic polymer becomes soft, and the above-mentioned characteristics of the pressure-sensitive adhesive layer of the present invention (particularly, the sinking depth according to thermomechanical analysis (TMA)) are described. It is preferable from the viewpoint of controlling the ratio of the pressure-sensitive adhesive layer to the thickness (sinking depth / thickness ⁇ 100), absorbing the impact caused by the collision of the electronic components, and suppressing the misalignment and turning over of the electronic components.
- the glass transition temperature when the homopolymer of the low Tg monomer is formed is not particularly limited, but is, for example, 0 ° C. or lower, preferably ⁇ 10 ° C. or lower, and more preferably ⁇ 25 ° C. or lower.
- the Tg of the low Tg monomer is in the above range, the impact absorption of the pressure-sensitive adhesive layer is improved.
- the low Tg monomer may be the above-mentioned monomer exemplified as the monomer contained in the monomer component constituting the acrylic polymer, or may be another monomer.
- the monomer component constituting the acrylic polymer is preferably the monomer exemplified as the monomer component constituting the acrylic polymer described above, and preferably contains a monomer component which is a low Tg monomer.
- the low Tg monomer may be only one kind or two or more kinds.
- the low Tg monomer is not particularly limited, and is, for example, 2-ethylhexyl acrylate (EHA, homopolymer Tg: -70 ° C), butyl acrylate (BA, homopolymer Tg: -55 ° C), and methacrylic acid.
- EHA 2-ethylhexyl acrylate
- BA butyl acrylate
- methacrylic acid Lauryl (LMA, homopolymer Tg: -65 ° C), lauryl acrylate (LA, homopolymer Tg: -23 ° C), isononyl acrylate (iNAA, homopolymer Tg: -58 ° C) and the like can be mentioned.
- 2-Ethylhexyl acrylate, butyl acrylate, and lauryl methacrylate are preferred.
- the proportion of the low Tg monomer in the total monomer component (100% by weight) constituting the acrylic polymer is particularly limited. However, it is preferably 80% by weight or more, and may be 85% by weight or more, or 90% by weight or more.
- the upper limit of the proportion of the low Tg monomer is also not particularly limited, but may be 99% by weight or less, or 98% by weight or less.
- the ratio of the low Tg monomer is within the above range, the ratio of the subduction depth by the thermomechanical analysis (TMA) to the thickness of the pressure-sensitive adhesive layer (subduction depth / thickness ⁇ 100).
- the above-mentioned "ratio of low Tg monomers" is the total of the proportions of the above two or more kinds of low Tg monomers.
- the content of the base polymer (particularly acrylic polymer) in the pressure-sensitive adhesive layer of the present invention is not particularly limited, but is 50% by weight or more (for example, 50) with respect to 100% by weight of the total weight of the pressure-sensitive adhesive layer of the present invention. ⁇ 100% by weight), more preferably 80% by weight or more (for example, 80 to 100% by weight), still more preferably 90% by weight or more (for example, 90 to 100% by weight).
- the base polymer such as the acrylic polymer contained in the pressure-sensitive adhesive layer of the present invention can be obtained by polymerizing a monomer component.
- the polymerization method is not particularly limited, and examples thereof include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method by irradiation with active energy rays (active energy ray polymerization method).
- active energy ray polymerization method active energy ray polymerization method
- the solution polymerization method and the active energy ray polymerization method are preferable, and the solution polymerization method is more preferable, from the viewpoints of transparency and cost of the pressure-sensitive adhesive layer.
- various general solvents may be used for the polymerization of the above-mentioned monomer components.
- the solvent include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane, methylcyclohexane and the like. Hydrocarbons of the above; organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone can be mentioned.
- the solvent can be used alone or in combination of two or more.
- a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) may be used depending on the type of the polymerization reaction.
- the polymerization initiator may be used alone or in combination of two or more.
- the thermal polymerization initiator is not particularly limited, but is, for example, an azo-based polymerization initiator, a peroxide-based polymerization initiator (for example, dibenzoyl peroxide, tert-butyl permalate, etc.), a redox-based polymerization initiator, and the like. Can be mentioned. Of these, peroxide-based polymerization initiators are preferable.
- azo-based polymerization initiator examples include 2,2'-azobisisobutyronitrile (hereinafter, may be referred to as "AIBN”) and 2,2'-azobis-2-methylbutyronitrile (hereinafter, “" AMBN "), 2,2'-azobis (2-methylpropionic acid) dimethyl, 4,4'-azobis-4-cyanovalerian acid and the like.
- AIBN 2,2'-azobisisobutyronitrile
- AMBN 2,2'-azobis-2-methylbutyronitrile
- 2,2'-azobis (2-methylpropionic acid) dimethyl 2,4'-azobis-4-cyanovalerian acid and the like.
- the thermal polymerization initiator may be used alone or in combination of two or more.
- the amount of the thermal polymerization initiator used is not particularly limited, but is preferably 0.05 parts by weight or more, more preferably 0, with respect to 100 parts by weight of all the monomer components constituting the acrylic polymer. It is preferably 1 part by weight or more, preferably 0.5 part by weight or less, and more preferably 0.3 part by weight or less.
- the photopolymerization initiator is not particularly limited, and is, for example, a benzoin ether-based photopolymerization initiator, an acetophenone-based photopolymerization initiator, an ⁇ -ketol-based photopolymerization initiator, an aromatic sulfonyl chloride-based photopolymerization initiator, and light.
- Examples thereof include an active oxime-based photopolymerization initiator, a benzoin-based photopolymerization initiator, a benzyl-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, a ketal-based photopolymerization initiator, and a thioxanthone-based photopolymerization initiator.
- an acylphosphine oxide-based photopolymerization initiator and a titanocene-based photopolymerization initiator can be mentioned.
- benzoin ether-based photopolymerization initiator examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, and the like. Anisole methyl ether and the like can be mentioned.
- acetophenone-based photopolymerization initiator include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, and 4- (t-butyl).
- Dichloroacetophenone and the like can be mentioned.
- Examples of the ⁇ -ketol-based photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1- [4- (2-hydroxyethyl) phenyl] -2-methylpropan-1-one, and the like. Be done.
- Examples of the aromatic sulfonyl chloride-based photopolymerization initiator include 2-naphthalene sulfonyl chloride and the like.
- Examples of the photoactive oxime-based photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (O-ethoxycarbonyl) -oxime.
- Examples of the benzoin-based photopolymerization initiator include benzoin and the like.
- Examples of the benzyl-based photopolymerization initiator include benzyl and the like.
- Examples of the benzophenone-based photopolymerization initiator include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexylphenylketone and the like.
- Examples of the ketal-based photopolymerization initiator include benzyldimethyl ketal and the like.
- Examples of the thioxanthone-based photopolymerization initiator include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone and the like.
- Examples of the acylphosphine oxide-based photopolymerization initiator include 2,4,6-trimethylbenzoyl-diphenyl-phosphinoxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphinoxide and the like. ..
- titanium-based photopolymerization initiator examples include bis ( ⁇ 5-2,4 -cyclopentadiene-1-yl) -bis (2,6-difluoro-3- (1H-pyrrole-1-yl) -phenyl. ) Titanium and the like can be mentioned.
- the photopolymerization initiator may be used alone or in combination of two or more.
- the amount of the photopolymerization initiator used is not particularly limited, but for example, with respect to 100 parts by weight of all the monomer components constituting the acrylic polymer.
- the amount is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, and more preferably 3 parts by weight or less, still more preferably 1.5 parts by weight or less.
- the formation of the pressure-sensitive adhesive layer of the present invention is not particularly limited, but a cross-linking agent may be used.
- a cross-linking agent may be used.
- TMA thermomechanical analysis
- the cross-linking agent can be used alone or in combination of two or more.
- the cross-linking agent is not particularly limited, and is, for example, an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, a melamine-based cross-linking agent, a peroxide-based cross-linking agent, a urea-based cross-linking agent, a metal alkoxide-based cross-linking agent, and a metal chelate-based cross-linking agent.
- examples thereof include agents, metal salt-based cross-linking agents, carbodiimide-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, and amine-based cross-linking agents.
- isocyanate-based cross-linking agents and epoxy-based cross-linking agents are preferable, and isocyanate-based cross-linking agents are more preferable.
- isocyanate-based cross-linking agent examples include lower aliphatic polyisocyanates such as 1,2-ethylenediisocyanate, 1,4-butylenediocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate.
- isocyanate-based cross-linking agent examples include trimethylolpropane / tolylene diisocyanate adduct (trade name “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd.) and trimethylolpropane / hexamethylene diisocyanate adduct (trade name).
- Commercial products such as "Coronate HL”, manufactured by Nippon Polyurethane Industry Co., Ltd., and trimethylolpropane / xylylene diisocyanate adduct (trade name "Takenate D-110N", manufactured by Mitsui Chemicals Co., Ltd.) can also be mentioned.
- epoxy-based cross-linking agent examples include N, N, N', N'-tetraglycidyl-m-xylene diamine, diglycidyl aniline, and 1,3-bis (N, N-diglycidyl).
- the amount of the cross-linking agent used is not particularly limited, but it is possible to absorb the impact caused by the collision of the electronic parts and suppress the misalignment and turning over of the electronic parts. Therefore, from the viewpoint of controlling the above-mentioned characteristics (particularly, the ratio of the subduction depth to the thickness of the pressure-sensitive adhesive layer (subduction depth / thickness ⁇ 100) by thermomechanical analysis (TMA)), the base polymer 100 It is preferably 0.001 part by weight or more, more preferably 0.01 part by weight or more with respect to parts by weight.
- the upper limit of the amount used is preferably 10 parts by weight or less with respect to 100 parts by weight of the base polymer, more preferably, from the viewpoint of obtaining appropriate flexibility in the pressure-sensitive adhesive layer and improving the adhesive strength. Is 5 parts by weight or less.
- the formation of the pressure-sensitive adhesive layer of the present invention is not particularly limited, but a cross-linking accelerator may be used.
- 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. ).
- the pressure-sensitive adhesive layer of the present invention is a pressure-sensitive adhesive layer (adhesive strength-reducable type pressure-sensitive adhesive layer) capable of intentionally reducing the pressure-sensitive adhesive force by an external action in the process of using the shock-absorbing pressure-sensitive adhesive sheet.
- it may be a pressure-sensitive adhesive layer (adhesive strength non-reducing type pressure-sensitive adhesive layer) in which the adhesive strength is hardly or not reduced by an external action in the process of using the shock-absorbing pressure-sensitive adhesive sheet, and the shock-absorbing pressure-sensitive adhesive of the present invention may be used. It can be appropriately selected according to the method and conditions for mounting the electronic component using the sheet.
- the pressure-sensitive adhesive layer of the present invention When the pressure-sensitive adhesive layer of the present invention is a pressure-reducable type pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer of the present invention exhibits a relatively high adhesive strength in the manufacturing process and the use process of the shock-absorbing pressure-sensitive adhesive sheet of the present invention. It is possible to properly use the state showing a relatively low adhesive force and the state showing a relatively low adhesive force. For example, in the step of receiving (transferring) an electronic component by the pressure-sensitive adhesive layer of the present invention in the process of using the shock-absorbing pressure-sensitive adhesive sheet of the present invention, a state in which the pressure-sensitive adhesive layer of the present invention exhibits relatively high adhesive strength is utilized.
- 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, and the radiation-curable pressure-sensitive adhesive is preferable in terms of operability. That is, the impact absorbing pressure-sensitive adhesive sheet of the present invention is preferably formed from a radiation-curable pressure-sensitive adhesive.
- 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 and a radiation-polymerizable monomer component or oligomer component having a functional group such as a radiation-polymerizable carbon-carbon double bond.
- examples include mold radiation curable adhesives.
- the base polymer an acrylic polymer similar to the above can be used.
- 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 pressure-sensitive adhesive layer of the present invention is, for example, 5 to 500 parts by mass, preferably 5 to 500 parts by mass, based on 100 parts by mass of the base polymer. It is about 40 to 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 it tends to be possible to suppress an unintended change in adhesive properties over time due to the movement of low molecular weight components in the formed pressure-sensitive adhesive layer.
- 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-.
- Examples thereof include ⁇ and ⁇ -dimethylbenzyl isocyanate.
- Examples of the acrylic polymer having a hydroxy group include those containing 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 glycol monovinyl ether. Be done.
- the content of the above-mentioned radiopolymerizable unsaturated functional group-containing isocyanate compound in the radiation-curable pressure-sensitive adhesive forming the pressure-sensitive adhesive layer of the present invention is The amount is, for example, about 5 to 100 parts by mass, preferably about 7 to 50 parts by mass with respect to 100 parts by mass of the base polymer.
- 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, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-1- (4- (4- (2-hydroxy-2-methylpropionyl) benzyl) phenyl) -2-methylpropan-1-one and the like.
- Examples of the acetophenone compound include methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, 2-methyl-1- [4- (methylthio) -phenyl] -2-morpholino.
- Propane-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 borohydride, 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 pressure-sensitive adhesive layer of the present invention may be a non-reduced pressure-sensitive adhesive layer, or a part of the pressure-sensitive adhesive layer may be a non-reduced pressure-sensitive adhesive layer.
- the entire pressure-sensitive adhesive layer of the present invention may be a non-reduced pressure-sensitive adhesive layer, or a specific site in the pressure-sensitive adhesive layer of the present invention. Is a non-reducing adhesive force type pressure-sensitive adhesive layer, and other portions may be a pressure-reducing type pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive layer of the present invention 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, or some of the pressure-sensitive adhesive layers in the laminated structure may be. It may be a non-reducing adhesive strength type 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 shock absorbing adhesive sheet of the present invention. When the irradiated radiation-curable pressure-sensitive adhesive layer is used, the entire pressure-sensitive adhesive layer of the present invention may be the radiation-irradiated radiation-curable pressure-sensitive adhesive layer in the surface spreading direction of the pressure-sensitive adhesive layer of the present invention.
- a part of the pressure-sensitive adhesive layer of the present invention may be a radiation-irradiated radiation-curable pressure-sensitive adhesive layer, and the other part may be a radiation-curable pressure-sensitive adhesive layer that has not been irradiated.
- the "radiation-curable pressure-sensitive adhesive layer” means a pressure-sensitive adhesive layer formed of a radiation-curable pressure-sensitive adhesive, and is a radiation-non-irradiation radiation-curable pressure-sensitive adhesive layer having radiation curability and the pressure-sensitive adhesive. Includes both a radiation-cured radiation-curable pressure-sensitive adhesive layer after the agent layer has been cured by radiation 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 pressure-sensitive adhesive layer of the present invention contains an acrylic polymer as a pressure-sensitive pressure-sensitive adhesive
- 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. It is preferable to have.
- 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 pressure-sensitive adhesive layer of the present invention further comprises a tackifier resin (rosin derivative, polyterpene resin, petroleum resin, oil-soluble phenol, etc.), an antiaging agent, a filler, a colorant (pigment, dye, etc.), if necessary.
- a tackifier resin Rosin derivative, polyterpene resin, petroleum resin, oil-soluble phenol, etc.
- an antiaging agent e.g., an antiaging agent, e.g., a filler, a colorant (pigment, dye, etc.), if necessary.
- Additives such as an ultraviolet absorber, an antioxidant, a chain transfer agent, a plasticizer, a softener, a surfactant, and an antioxidant may be contained within a range that does not impair the effects of the present invention. Such additives can be used alone or in combination of two or more.
- the method for producing the pressure-sensitive adhesive layer (particularly, the acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited, but for example, the pressure-sensitive adhesive composition obtained by applying (coating) the above-mentioned pressure-sensitive adhesive composition on a base material or a separator is obtained.
- the agent composition layer can be dried and cured, or the pressure-sensitive adhesive composition can be applied (coated) on a substrate or a separator, and the obtained pressure-sensitive adhesive composition layer can be cured by irradiating it with active energy rays. Can be mentioned. Further, if necessary, it may be further heated and dried.
- the active energy rays include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, and electron beams, ultraviolet rays, and the like, and ultraviolet rays are particularly preferable. Further, the irradiation energy of the active energy ray, the irradiation time, the irradiation method, and the like are not particularly limited.
- the pressure-sensitive adhesive composition can be produced by a known or conventional method.
- a solvent-type acrylic pressure-sensitive adhesive composition can be prepared by mixing an additive (for example, an ultraviolet absorber, etc.) with a solution containing the acrylic polymer, if necessary.
- the active energy ray-curable acrylic pressure-sensitive adhesive composition is prepared by mixing an additive (for example, an ultraviolet absorber) with the mixture of the acrylic monomers or a partial polymer thereof, if necessary. Can be made.
- a known coating method may be used for applying (coating) the pressure-sensitive adhesive composition.
- a coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, a comma coater, or a direct coater may be used.
- the active energy ray-curable pressure-sensitive adhesive composition contains a photopolymerization initiator.
- the active energy ray-curable pressure-sensitive adhesive composition contains an ultraviolet absorber
- the photopolymerization initiator contains at least a photopolymerization initiator having absorption characteristics in a wide wavelength range.
- the photopolymerization initiator having absorption characteristics even in visible light. This is because there is a concern that the action of the ultraviolet absorber may inhibit the curing by the active energy rays.
- the pressure-sensitive adhesive composition has high photocurability. This is because it is easy to obtain.
- the impact absorbing pressure-sensitive adhesive sheet of the present invention preferably has at least one layer of a base material. That is, the impact absorbing pressure-sensitive adhesive sheet of the present invention is preferably a pressure-sensitive adhesive sheet with a base material.
- the shock-absorbing pressure-sensitive adhesive sheet of the present invention is preferable in that it functions as a support by having a base material in addition to the pressure-sensitive adhesive layer, and improves stability and handleability when receiving electronic components.
- the base material is not particularly limited, but for example, a plastic film can be preferably used.
- a thermoplastic resin is preferable from the viewpoint of stability and handleability when receiving electronic parts.
- the thermoplastic resin include polyolefins, polyesters, polyurethanes, polycarbonates, polyether ether ketones, polyimides, polyetherimides, polyamides, all aromatic polyamides, polyvinyl chlorides, polyvinylidene chlorides, polyphenylsulfides, aramids, and fluororesins.
- Cellulosic resin, and silicone resin, and polyester film is preferable.
- polystyrene resin examples include ethylene-vinyl acetate copolymers, ionomer resins, ethylene- (meth) acrylic acid copolymers, ethylene- (meth) acrylic acid ester copolymers, ethylene-butene copolymers, and ethylene-hexene copolymers. Be done.
- polyester examples include polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate.
- the base material may be made of one kind of material or may be made of two or more kinds of materials.
- the base material may have a single-layer structure or a multi-layer structure.
- the base material is made of a plastic film, it may be a non-stretched film, a uniaxially stretched film, or a biaxially stretched film.
- the separator that is peeled off when the shock absorbing adhesive sheet is used is not included in the "base material".
- the thickness of the base material is not particularly limited, but is preferably 10 ⁇ m or more, more preferably 30 ⁇ m or more, for example, from the viewpoint of ensuring the strength for functioning as a support. Further, from the viewpoint of realizing appropriate flexibility in the shock absorbing pressure-sensitive adhesive sheet of the present invention, the thickness of the base material is preferably 200 ⁇ m or less, more preferably 180 ⁇ m or less.
- the base material may have either a single layer or a plurality of layers. Further, in order to improve the adhesion to the pressure-sensitive adhesive layer of the present invention, the surface of the base material is known and commonly used, for example, physical treatment such as corona discharge treatment and plasma treatment, and chemical treatment such as undercoat treatment. Surface treatment may be appropriately applied.
- the shock absorbing pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet with a base material
- the shock absorbing pressure-sensitive adhesive sheet of the present invention is preferably a double-sided pressure-sensitive adhesive sheet with a base material. Since the shock absorbing pressure-sensitive adhesive sheet of the present invention is a double-sided pressure-sensitive adhesive sheet with a base material, for example, another pressure-sensitive adhesive layer can be fixed to another substrate (carrier substrate), which is preferable from the viewpoint of workability.
- the other pressure-sensitive adhesive layer may be composed of the same pressure-sensitive adhesive as the pressure-sensitive adhesive layer of the present invention, or may be composed of a pressure-sensitive adhesive different from the pressure-sensitive adhesive layer of the present invention.
- a layer of a pressure-sensitive adhesive that can reduce the adhesive strength such as a radiation-curable pressure-sensitive adhesive or a heat-foaming type pressure-sensitive adhesive, is preferable.
- Electronic components can be transferred with high adhesion between the other adhesive layer and the carrier substrate, and then the adhesive strength of the other adhesive layer is reduced by irradiation or heating to easily peel off from the carrier substrate. Therefore, the carrier substrate can be easily reused, which is preferable from the viewpoint of excellent reworkability.
- the thickness of the other pressure-sensitive adhesive layer is not particularly limited, but is preferably 1 ⁇ m or more, and more preferably 3 ⁇ m or more. When the thickness is a certain value or more, it becomes easy to stably fix the carrier substrate, which is preferable.
- the upper limit of the thickness of the other pressure-sensitive adhesive layer is not particularly limited, but is preferably 100 ⁇ m or less, and more preferably 80 ⁇ m or less. When the thickness is not more than a certain level, it is easy to peel off from the carrier substrate, and reworkability is improved, which is preferable.
- the surface of the pressure-sensitive adhesive layer of the shock-absorbing pressure-sensitive adhesive sheet of the present invention may be protected by a separator until use.
- each pressure-sensitive adhesive surface may be protected by two separators, or may be rolled by one separator whose both sides are peeled surfaces. It may be protected in a wound form (rolled body).
- the separator is used as a protective material for the pressure-sensitive adhesive layer and is peeled off during use.
- the shock absorbing pressure-sensitive adhesive sheet of the present invention is a base material-less pressure-sensitive adhesive sheet, the separator also serves as a support for the pressure-sensitive adhesive layer. The separator may not always be provided.
- the separator conventional release paper or the like can be used, and the separator is not particularly limited, but for example, a substrate having a release treatment layer, a low adhesive substrate made of a fluoropolymer, a low adhesive substrate made of a non-polar polymer, or the like.
- a substrate having a release treatment layer a low adhesive substrate made of a fluoropolymer, a low adhesive substrate made of a non-polar polymer, or the like.
- the base material having the peeling treatment layer include a plastic film and paper surface-treated with a peeling treatment agent such as silicone-based, long-chain alkyl-based, fluorine-based, and molybdenum sulfide.
- fluorine-based polymer in the low-adhesion substrate made of the above-mentioned fluorine polymer examples include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, and chloro. Examples thereof include a fluoroethylene-vinylidene fluoride copolymer.
- non-polar polymer include olefin resins (for example, polyethylene, polypropylene, etc.).
- the separator can be formed by a known or conventional method. 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 shock-absorbing pressure-sensitive adhesive sheet 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. For example, the following (1) to (4) can be used. ) And other methods.
- 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,). (3) A method for producing an adhesive sheet by transferring the adhesive layer onto a substrate after forming the adhesive layer by heat curing or curing by irradiation with active energy rays such as ultraviolet rays (3). A method of applying (coating) on a substrate and drying to form an adhesive layer to produce an adhesive sheet (4) Applying (coating) the above-mentioned adhesive composition onto a separator and drying it. After forming the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is transferred onto a base material to produce a pressure-sensitive adhesive sheet.
- a method of forming a pressure-sensitive adhesive layer by drying is preferable 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 shock absorbing pressure-sensitive adhesive sheet of the present invention is not particularly limited, but is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, still more preferably 3 ⁇ m or more. When the thickness is at least a certain level, it is preferable that the electronic component is easily transferred to the pressure-sensitive adhesive layer of the present invention with high accuracy.
- the upper limit of the thickness (total thickness) of the shock absorbing pressure-sensitive adhesive sheet 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 another carrier board or mounting board with high accuracy, which is preferable.
- the thickness of the impact absorbing pressure-sensitive adhesive sheet of the present invention does not include the thickness of the separator.
- the shock-absorbing pressure-sensitive adhesive sheet of the present invention has the pressure-sensitive adhesive layer of the present invention, it exhibits excellent shock-absorbing properties.
- the impact absorption rate (%) in the ball drop test described later is 10% or more, preferably 15% or more, and 20% or more, 25% or more, 30% or more, 35% or more, or 40% or more. There may be.
- the ratio of the adhesive sinking depth to the pressure-sensitive adhesive thickness in the ball-dropping test described later (adhesive sinking depth after the ball-dropping test / thickness ⁇ 100). Is 7% or more, preferably 10% or more, and may be 15% or more, 20% or more, 25% or more, or 30% or more.
- the ball drop test can be performed by the following method. First, a 2 kg hand roller is attached to a SUS plate (thickness 5 mm) on the entire surface of the shock absorbing adhesive sheet (width 30 mm ⁇ length 30 mm) opposite to the adhesive layer on the evaluation surface via double-sided adhesive tape. Attach using. A 1 g iron ball is freely dropped from a height of 1 m onto the pressure-sensitive adhesive layer surface of the evaluation sample obtained as described above using a ball drop tester. The depth of subduction of the iron ball into the pressure-sensitive adhesive layer surface is measured with a confocal laser scanning microscope.
- the sinking depth ( ⁇ m) is divided by the thickness ( ⁇ m) of the pressure-sensitive adhesive sheet, and the ratio of the sinking depth of the pressure-sensitive adhesive to the thickness of the pressure-sensitive adhesive (adhesive sinking depth / thickness after the falling ball test). ⁇ 100) is calculated. Further, the impact load F when an impact is applied under the above conditions is measured by the falling ball tester, and the impact absorption rate (%) is obtained from the following formula.
- Shock absorption rate (%) ⁇ (F 0 -F 1 ) / F 0 ⁇ x 100 (In the above formula, F 0 is the impact load when the iron ball is made to collide only with the SUS plate without attaching the adhesive sheet, and F 1 is the adhesive sheet of the structure composed of the SUS plate and the adhesive sheet. It is the impact load when an iron ball collides with the top.)
- the shock absorbing adhesive sheet of the present invention is used as a processing method for electronic parts (application for processing electronic parts). More specifically, the shock absorbing pressure-sensitive adhesive sheet of the present invention is preferably used for receiving electronic components arranged on a temporary fixing material (board or pressure-sensitive adhesive sheet) in the pressure-sensitive adhesive layer of the present invention. Since the shock-absorbing pressure-sensitive adhesive sheet of the present invention has the pressure-sensitive adhesive layer of the present invention, it can sufficiently absorb the shock caused by a collision with the pressure-sensitive adhesive layer such as an electronic component, and the electronic component may be displaced or turned inside out due to the bounce of the electronic component at the time of collision. Can be suppressed.
- the surface on which the electronic parts of the temporary fixing material are arranged and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer of the shock-absorbing pressure-sensitive adhesive sheet of the present invention face each other. Therefore, it is preferable that the components are arranged with a gap.
- This configuration is preferable in that the positional relationship between the temporary fixing material and the shock absorbing pressure-sensitive adhesive sheet of the present invention can be controlled, and the electronic component can be arranged at a desired position of the shock absorbing pressure-sensitive adhesive sheet.
- the method for processing an electronic component of the present invention includes a step (first step) of receiving the electronic component arranged on the temporary fixing material on the adhesive surface of the adhesive layer of the shock absorbing adhesive sheet of the present invention.
- the impact absorbing pressure-sensitive adhesive sheet of the present invention can sufficiently absorb the impact caused by a collision with an adhesive layer such as an electronic component, and the electronic component is displaced or turned inside out due to the bounce of the electronic component at the time of collision. Can be suppressed.
- the surface on which the electronic component is arranged on the temporary fixing material and the adhesive surface of the adhesive layer of the shock absorbing adhesive sheet of the present invention face each other and are arranged with a gap. It is preferable to be done.
- This configuration is preferable in that the positional relationship between the temporary fixing material and the shock absorbing pressure-sensitive adhesive sheet of the present invention can be controlled, and the electronic component can be arranged at a desired position of the shock absorbing pressure-sensitive adhesive sheet.
- the method for processing an electronic component of the present invention further includes a step of arranging the electronic component on the shock absorbing pressure-sensitive adhesive sheet on another pressure-sensitive adhesive sheet or another substrate (second step), and the shock-absorbing pressure-sensitive adhesive sheet. It is preferable to include a step (third step) of peeling the electronic component from the adhesive surface of the pressure-sensitive adhesive layer.
- the method for processing an electronic component of the present invention can efficiently transfer the electronic component by including the second step and the third step.
- FIG. 3 is a schematic cross-sectional view showing a first step in an embodiment of a method for processing an electronic component of the present invention using the shock absorbing pressure-sensitive adhesive sheet 1 shown in FIG.
- the electronic component 31 (see FIG. 3A) arranged on the temporary fixing material 30 is separated, and the shock absorbing adhesive sheet 1 is adhered.
- This is a step of receiving on the adhesive surface of the agent layer 10 (see FIGS. 3 (b) and 3 (c)).
- a plurality of electronic components 31 are arranged on one side of the temporary fixing material 30.
- the material constituting the temporary fixing material 30 is not particularly limited, and examples thereof include the above-mentioned plastic film and glass substrate.
- the temporary fixing material 30 may be an adhesive sheet, and in that case, the electronic component 31 may be arranged on the adhesive surface of the adhesive sheet.
- the temporary fixing material 30 is preferably made of a radiation-permeable material.
- the method of arranging the electronic component 31 on one side of the temporary fixing material 30 is not particularly limited, and examples thereof include arranging the electronic component 31 via the adhesive force-reducable adhesive layer described above. In that case, the temporary fixing state can be released by irradiating or heating the pressure-sensitive adhesive layer with reduced adhesive strength.
- the electronic component 31 is arranged on the temporary fixing material 30 via the radiation-curable pressure-sensitive adhesive layer (not shown).
- a plurality of electronic components 31 are arranged on one side of the temporary fixing material 30.
- the size of the electronic component 31 is, for example, 1 ⁇ m 2 to 250,000 ⁇ m 2 . According to the method for processing an electronic component of the present invention, such a small electronic component can be efficiently transferred.
- the surface on which the electronic component 31 of the temporary fixing material 30 is arranged is arranged downward, and the adhesive surface of the adhesive layer 10 of the shock absorbing adhesive sheet 1 is arranged upward, and the temporary fixing material is arranged.
- the surface on which the electronic component 31 of 30 is temporarily fixed and the adhesive surface of the adhesive layer 10 of the shock absorbing adhesive sheet 1 face each other, and a gap d is provided.
- the gap d By providing the gap d, the positional relationship between the temporary fixing material 30 and the shock absorbing pressure-sensitive adhesive sheet 1 of the present invention can be controlled, and the electronic component 31 can be arranged at a desired position of the shock absorbing pressure-sensitive adhesive sheet 1.
- the interval of the gap d is not particularly limited, but is, for example, about 1 to 1000 ⁇ m.
- the pressure-sensitive adhesive layer 10 is formed of a shock-absorbing pressure-sensitive adhesive. Further, the surface of the shock absorbing pressure-sensitive adhesive sheet 1 on which the pressure-sensitive adhesive layer 10 is not formed may be laminated with another pressure-sensitive adhesive layer, and in that case, it is fixed to another substrate via the other pressure-sensitive adhesive layer. It may be (not shown).
- the electronic component 31 is irradiated with laser light L from the side of the temporary fixing material 30 to release the temporary fixing state of the electronic component 31, and the electronic component 31 is separated from the temporary fixing material 30. More specifically, when the temporary fixing material 30 at the portion in contact with the electronic component 31 is irradiated with the laser beam L, the adhesive force is reduced, and the electronic component 31 is separated from the temporary fixing material 30. Will be done.
- the laser beam L may irradiate a plurality of electronic components 31 individually, irradiate a part thereof, irradiate all the electronic components 31 at once, or irradiate the electronic components 31 by sweeping. good. In this embodiment, a part of a plurality of electronic components 31 is irradiated.
- the electronic component 31 separated from the temporary fixing material 30 falls toward the shock absorbing adhesive sheet 1 and is received by the adhesive surface of the adhesive layer 10.
- the pressure-sensitive adhesive layer 10 is composed of the pressure-sensitive adhesive layer of the present invention and exhibits excellent shock absorption. Therefore, it absorbs the shock caused by the collision of electronic parts to prevent damage, and suppresses misalignment and inside out of electronic parts. can.
- FIGS. 3 (c) and 3 (d) another electronic component 31 arranged on the temporary fixing material 30 is irradiated with laser light L to be separated and dropped, and is received (transferred) by the adhesive surface of the adhesive layer 10. ).
- the laser beam L is irradiated to the electronic component 31 adjacent to the electronic component 31 irradiated with the laser beam L in FIG. 3 (b).
- the positional relationship between the temporary fixing material 30 and the shock absorbing adhesive sheet 1 may be the same as in FIG. 3 (b), or the positional relationship may be shifted. ..
- the temporary fixing material 30 is displaced to the right of FIG. 3 by a predetermined interval with respect to the shock absorbing adhesive sheet 1, and then the laser beam L is irradiated.
- the electronic component 31 can be arranged on the pressure-sensitive adhesive layer 10 of the shock-absorbing pressure-sensitive adhesive sheet 1 by controlling the pitch to a desired level.
- FIG. 3 (e) shows a form in which all the electronic components 31 are received by the pressure-sensitive adhesive layer 10 by repeating the steps shown in FIGS. 3 (c) and 3 (d).
- the electronic components 31 are arranged with a desired pitch.
- FIG. 4 is a schematic cross-sectional view showing the second step and the third step in one embodiment of the method for processing an electronic component of the present invention using the shock absorbing adhesive sheet 1 shown in FIG.
- the electronic components 31 arranged on the adhesive surface of the adhesive layer 10 of the shock absorbing adhesive sheet 1 are arranged so as to face or separate from the other adhesive sheet or the substrate 40.
- the surface 41 of the substrate 40 facing the shock absorbing adhesive sheet 1 is an adhesive surface
- the surface 41 is a circuit surface.
- the surface 41 of the other adhesive sheet or the substrate 40 and the electronic component 31 arranged on the adhesive surface of the adhesive layer 10 of the shock absorbing adhesive sheet 1 are brought close to each other.
- the electronic component 31 By bringing the electronic component 31 into contact with the surface 41, the electronic component 31 can be arranged on the surface 41 of another adhesive sheet or the substrate 40.
- the electronic component 31 is irradiated with ultraviolet rays U from the base material 11 side of the shock-absorbing pressure-sensitive adhesive sheet 1 as shown in FIG. 4 (c). ..
- the ultraviolet U U cures the pressure-sensitive adhesive layer 10 formed of the radiation-curable pressure-sensitive adhesive, reduces the adhesive strength, and makes the electronic component 31 peelable.
- the ultraviolet rays U may irradiate all the electronic components 31 or may irradiate some of the electronic components 31 with a mask or the like, if necessary. In this embodiment, all the electronic components 31 are irradiated with ultraviolet rays U.
- the electronic component 31 is placed on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 10 of the shock-absorbing pressure-sensitive adhesive sheet 1. Can be peeled off and at the same time transferred to the surface 41 of another pressure-sensitive adhesive sheet or substrate 40. Since the radiation-curable pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 10 is cured by ultraviolet rays U and its adhesive strength is reduced, the electronic component 31 can be easily peeled off to the surface 41 of another pressure-sensitive adhesive sheet or substrate 40. It can be transferred and placed. The electronic component 31 arrangement pattern on the pressure-sensitive adhesive layer 10 of the shock-absorbing pressure-sensitive adhesive sheet 1 is maintained, and the electronic component 31 is transferred and arranged on the surface 41.
- 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.
- Example 1 (Preparation of adhesive) Acrylic polymer solution A containing 100 parts by weight of acrylic polymer A, 0.2 parts by weight of a cross-linking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name “Coronate L”), ⁇ -hydroxyketone-based photopolymerization initiator (BASF) A pressure-sensitive adhesive was obtained by adding 3 parts by weight (manufactured by Japan, trade name "Irgacure 127", molecular weight: 340.4, absorption coefficient at wavelength 365 nm: 1.07 ⁇ 10 2 ml / g ⁇ cm).
- a cross-linking agent manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”
- BASF ⁇ -hydroxyketone-based photopolymerization initiator
- Adhesive sheet The above adhesive was applied to one surface of a polyethylene terephthalate film (thickness: 50 ⁇ m) so that the thickness after solvent volatilization (drying) was 5 ⁇ m to form an adhesive layer, and an adhesive sheet was obtained. The adhesive surface of the obtained adhesive sheet was protected with a separator (Diafoil MRF manufactured by Mitsubishi Chemical Corporation) to obtain an adhesive sheet made of (polyethylene terephthalate film / adhesive layer / separator).
- a separator Diafoil MRF manufactured by Mitsubishi Chemical Corporation
- Example 2 A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 30 ⁇ m.
- Example 3 A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- Example 4 A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 100 ⁇ m.
- Example 5 A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 200 ⁇ m.
- Example 6 Example 1 except that the amount of the cross-linking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”) is 1 part by weight and the thickness of the adhesive layer after solvent volatilization (drying) is 50 ⁇ m.
- an adhesive sheet made of (polyethylene terephthalate film / adhesive layer / separator) was obtained.
- Example 7 Example 1 except that the amount of the cross-linking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”) is 3 parts by weight and the thickness of the adhesive layer after solvent volatilization (drying) is 50 ⁇ m.
- an adhesive sheet made of (polyethylene terephthalate film / adhesive layer / separator) was obtained.
- Example 8 In the same manner as in Example 1, except that a separator (diafoil MRF manufactured by Mitsubishi Chemical Corporation) was used instead of the polyethylene terephthalate film and the thickness of the adhesive layer after solvent volatilization (drying) was 50 ⁇ m, ( A substrate-less double-sided adhesive sheet composed of a separator / adhesive layer / separator) was obtained.
- a separator diafoil MRF manufactured by Mitsubishi Chemical Corporation
- a pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- Example 10 Preparation of adhesive
- 1.0 part by weight of cross-linking agent manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”
- cross-linking agent manufactured by Mitsubishi Gas Chemical Company, Inc.
- acrylic polymer solution C containing 100 parts by weight of acrylic polymer C.
- Product name "Tetrad C” 0.6 parts by weight was added to obtain a pressure-sensitive adhesive.
- Adhesive sheet A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- a pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- Example 12 (Preparation of adhesive) A pressure-sensitive adhesive was obtained by adding 2.0 parts by weight of a cross-linking agent (manufactured by Mitsubishi Gas Chemical Company, Inc., trade name "Tetrad C") to an acrylic polymer solution C containing 100 parts by weight of acrylic polymer E.
- Adhesive sheet A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- Example 13 A pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 12 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 200 ⁇ m.
- a pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- a pressure-sensitive adhesive sheet made of (polyethylene terephthalate film / pressure-sensitive adhesive layer / separator) was obtained in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer after solvent volatilization (drying) was 50 ⁇ m.
- Probe tack value Double-sided adhesive tape (Nitto Denko Co., Ltd., trade name "No. 5600") on the entire surface of the evaluation surface of the adhesive sheet (width 20 mm x length 50 mm) opposite to the adhesive layer. It was attached to a slide glass (manufactured by Matsunami Glass Industry Co., Ltd., 26 mm ⁇ 76 mm) using a 2 kg hand roller. The separator of the evaluation sample obtained as described above is peeled off, and the probe tack value of the exposed pressure-sensitive adhesive layer surface is measured by using a probe tack measuring machine (manufactured by RHESCA, trade name "TACKINESS Model TAC-II").
- Adhesive strength (against SUS304)
- the separators of the pressure-sensitive adhesive sheets of Examples and Comparative Examples were peeled off, the exposed pressure-sensitive adhesive layer surface was attached to SUS304, and the adhesive strength of the pressure-sensitive adhesive sheet was adjusted according to JIS Z 0237: 2000 (bonding conditions: It was measured by 1 reciprocating 2 kg roller, tensile speed: 300 mm / min, peeling angle: 180 °, measurement temperature: 23 ° C.).
- the adhesive strength of the obtained sample was measured under the same conditions as above (method according to JIS Z 0237: 2000) to measure the adhesive strength of the adhesive layer after curing. Further, in the ultraviolet curable pressure-sensitive adhesive sheet having no base material of Example 8, only one separator of the pressure-sensitive adhesive sheet was peeled off, and the exposed pressure-sensitive adhesive layer surface was attached to SUS304 to cover the entire surface of the pressure-sensitive adhesive layer.
- an ultraviolet irradiation device manufactured by Nitto Seiki Co., Ltd., trade name "UM-810"
- the entire surface is irradiated with ultraviolet rays (specific wavelength: 365 nm, integrated light amount: 460 mJ / cm 2 ) of a high-pressure mercury lamp, and the other separator is peeled off.
- a single-sided adhesive tape (Nitto Denko Co., Ltd., trade name "No. 315") was attached to the peeled surface to prepare a sample for evaluation.
- the adhesive strength of the obtained sample was measured under the same conditions as above (method according to JIS Z 0237: 2000).
- the measurement data is swept based on the WLF formula at a reference temperature of 25 ° C., and the master curve is synthesized to store elastic modulus and frequency-dependent data of tan ⁇ .
- the storage elastic modulus at 100 kHz and the value of the loss coefficient (tan ⁇ ) were extracted.
- a SUS plate is placed on the entire surface of the adhesive sheet (width 30 mm x length 30 mm) opposite to the adhesive layer on the evaluation surface via double-sided adhesive tape (Nitto Denko Corporation, product name "No. 5603"). It was attached to (thickness 5 mm) using a 2 kg hand roller.
- the separator of the evaluation sample obtained as described above was peeled off, and 1 g of an iron ball was freely dropped from a height of 1 m onto the exposed pressure-sensitive adhesive layer surface using a ball-dropping tester. The depth of subduction of the iron ball into the pressure-sensitive adhesive layer surface was measured with a confocal laser scanning microscope.
- the sinking depth ( ⁇ m) is divided by the thickness ( ⁇ m) of the pressure-sensitive adhesive sheet, and the ratio of the sinking depth of the pressure-sensitive adhesive to the thickness of the pressure-sensitive adhesive (adhesive sinking depth / thickness after the falling ball test). ⁇ 100) was calculated. Further, the impact load F when an impact was applied under the above conditions was measured by the falling ball tester, and the impact absorption rate (%) was obtained from the following formula.
- a shock-absorbing pressure-sensitive adhesive sheet having at least one pressure-sensitive adhesive layer having at least one pressure-sensitive adhesive layer.
- the feature is that the ratio of the sinking depth to the thickness of the pressure-sensitive adhesive layer (subduction depth / thickness ⁇ 100) by thermomechanical analysis (TMA) under the following conditions with respect to the pressure-sensitive adhesive layer is 10% or more. Shock absorbing adhesive sheet.
- Appendix 2 The shock absorbing adhesive sheet according to Appendix 1, wherein the probe tack value of the pressure-sensitive adhesive layer at room temperature is 10 N / cm 2 or more and 42 N / cm 2 or less.
- Appendix 3 The shock absorbing adhesive sheet according to Appendix 1 or 2, wherein the common logarithm (Log 10 G') of the storage elastic modulus (Pa) at a frequency of 100 kHz and 25 ° C. of the adhesive layer is 7.5 or less. ..
- the adhesive strength of the pressure-sensitive adhesive layer to stainless steel at room temperature is 1 N / 20 mm or less.
- Adhesive sheet or substrate 1, 2 Impact absorbing adhesive sheet 10, 20 Adhesive layer 11, 21 Base material 22 Adhesive layer (other adhesive layers) 30 Temporary fixing material (board or adhesive sheet) 31 Electronic components 40 Adhesive sheet or substrate
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Abstract
Description
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分
-40℃での熱機械分析(TMA)における上記割合(沈み込み深さ/厚さ×100)が10%以上であるという構成は、前記粘着剤層を薄くしても、電子部品の衝突による衝撃を十分に吸収でき、電子部品を損傷や位置ずれなく受け取ることができる点で好ましい。電子部品の衝突による衝撃を十分に吸収できる点から、当該割合は、15%以上が好ましく、20%以上、30%以上、40%以上、50%以上、60%以上、70%以上、又は80%以上であってもよい。
本発明の第1の側面の衝撃吸収粘着シートにおいて、前記粘着剤層の周波数100kHz、25℃での貯蔵弾性率(Pa)の常用対数(Log10G')は7.5以下であることが好ましい。前記貯蔵弾性率の常用対数が7.5以下であるという構成は、電子部品などの粘着剤層への衝突による衝撃を十分に吸収でき、衝突時の電子部品の跳ねによる位置ずれや裏返りなどを抑制できる点で好ましい。電子部品の衝突による衝撃吸収性の観点から、前記貯蔵弾性率の常用対数は、7.4以下が好ましく、7.3以下、7.2以下、7.1以下、又は7以下であってもよい。
なお、前記粘着剤層が放射線硬化性粘着剤から形成される場合は、上記粘着力は、放射線硬化後の粘着力を意味するものとする。
なお、前記粘着剤層が放射線硬化性粘着剤から形成される場合は、上記粘着力は、放射線硬化後の粘着力を意味するものとする。
従って、電子部品を別のキャリア基板や実装基板上に効率的に移載する工程に好適に使用することができる。
本発明の衝撃吸収粘着シートは、少なくとも1層の粘着剤層を有する。本発明の衝撃吸収粘着シートにおいて、前記粘着剤層に対する下記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)は10%以上である。
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分
本発明の粘着剤層は、上記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)が10%以上である。本発明の衝撃吸収粘着シートは、レーザートランスファー工程における転写用基板として好適に用いることができるものである。レーザートランスファー工程においては、光学的な時間スケールで電子部品の転写が完了するため、この時間スケールでの粘着剤の衝撃緩和特性が重要となる。具体的には、光学的な時間スケールとは、レーザー光を掃引する周波数と相関があり、例えば、100kHzなどである。100kHzの周波数領域の粘着剤物性は、温度時間換算則より-40℃の低温領域での粘着剤物性に相当するため、この温度域で粘着剤に荷重を掛けたときの変形量が大きいほど衝撃緩和特性が優れていることを意味する。例えば、熱機械分析(TMA)で-40℃において粘着剤層に荷重を掛けた際の上記割合(沈み込み深さ/厚さ×100)を衝撃緩和特性の指標として用いることが出来る。
本発明の衝撃吸収粘着シートにおいて、本発明の粘着剤層の周波数100kHz、25℃での貯蔵弾性率(Pa)の常用対数(Log10G')は7.5以下であることが好ましい。前記貯蔵弾性率の常用対数が7.5以下であるという構成は、電子部品などの粘着剤層への衝突による衝撃を十分に吸収でき、衝突時の電子部品の跳ねによる位置ずれや裏返りなどを抑制できる点で好ましい。電子部品の衝突による衝撃吸収性の観点から、前記貯蔵弾性率の常用対数は、7.4以下が好ましく、7.3以下、7.2以下、7.1以下、又は7以下であってもよい。衝撃吸収粘着シート上に受け取った電子部品を搬送する際に位置がずれるのを防ぐ観点から、上記貯蔵弾性率の常用対数は、4以上が好ましく、5以上であってもよい。
本発明の衝撃吸収粘着シートにおいて、本発明の粘着剤層の周波数1Hz、-40℃での貯蔵弾性率(Pa)の常用対数(Log10G')は8.5以下であることが好ましい。前記貯蔵弾性率の常用対数が8.5以下であるという構成は、電子部品などの粘着剤層への衝突による衝撃を十分に吸収でき、衝突時の電子部品の跳ねによる位置ずれや裏返りなどを抑制できる点で好ましい。電子部品の衝突による衝撃吸収性の観点から、前記貯蔵弾性率の常用対数は、8.4以下が好ましく、8.3以下、8.2以下、8.1以下、又は8以下であってもよい。衝撃吸収粘着シート上に受け取った電子部品を搬送する際に位置がずれるのを防ぐ観点から、上記貯蔵弾性率の常用対数は、4以上が好ましく、5以上であってもよい。
なお、前記粘着剤層が放射線硬化性粘着剤から形成される場合は、上記粘着力は、放射線硬化後の粘着力を意味するものとする。
なお、前記粘着剤層が放射線硬化性粘着剤から形成される場合は、上記粘着力は、放射線硬化後の粘着力を意味するものとする。
本発明の衝撃吸収粘着シートは、少なくとも1層の基材を有することが好ましい。すなわち、本発明の衝撃吸収粘着シートは基材付き粘着シートであることが好ましい。本発明の衝撃吸収粘着シートが、前記粘着剤層に加えて、基材を有することにより支持体として機能し、電子部品を受け取る際の安定性や取り扱い性が向上する点で好ましい。
本発明の衝撃吸収粘着シートが基材付き粘着シートである場合、本発明の粘着剤層が積層してない他の面には、さらに、粘着剤層(その他の粘着剤)を有することが好ましい。すなわち、本発明の衝撃吸収粘着シートは基材付き両面粘着シートであることが好ましい。本発明の衝撃吸収粘着シートが、基材付き両面粘着シートであることにより、例えば、その他の粘着剤層を他の基板(キャリア基板)に固定することができ、作業性の観点から好ましい。
本発明の衝撃吸収粘着シートの粘着剤層表面(本発明の粘着剤層及び/又は他の粘着剤層の粘着面)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。本発明の衝撃吸収粘着シートが両面粘着シートである場合の各粘着面は、2枚のセパレータによりそれぞれ保護されていてもよいし、両面が剥離面となっているセパレータ1枚により、ロール状に巻回される形態(巻回体)で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、使用する際に剥がされる。また、本発明の衝撃吸収粘着シートが基材レス粘着シートの場合、セパレータは粘着剤層の支持体としての役割も担う。なお、セパレータは必ずしも設けられなくてもよい。
セパレータの厚さは、特に限定されず、5~100μmの範囲から適宜選択すればよい。
本発明の衝撃吸収粘着シートの製造方法は、上記粘着剤組成物の組成などによって異なり、特に限定されず、公知の形成方法を利用することができるが、例えば、以下の(1)~(4)などの方法が挙げられる。
(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
まず、衝撃吸収粘着シート(幅30mm×長さ30mm)の評価面の粘着剤層とは反対側の面の全面に、両面接着テープを介して、SUS板(厚さ5mm)に、2kgハンドローラーを用いて貼着する。
上記のようにして得られた評価用試料の粘着剤層面に、落球試験機を用いて、1gの鉄球を高さ1mから自由落下させる。該鉄球による粘着剤層面への沈み込み深さを、共焦点レーザー顕微鏡により計測する。次に、該沈み込み深さ(μm)を粘着シートの厚さ(μm)で割り、粘着剤の厚みに対する粘着剤の沈み込み深さの割合(落球試験後の粘着剤沈み込み深さ/厚み×100)を求める。
また、該落球試験機にて、上記条件で衝撃を加えた際の衝撃荷重Fを計測し、以下の式より衝撃吸収率(%)を求める。
衝撃吸収率(%)={(F0-F1)/F0}×100
(上記式において、F0は粘着シートを貼着せず、SUS板のみに鉄球を衝突させた時の衝撃荷重のことであり、F1はSUS板と粘着シートとからなる構造体の粘着シート上に鉄球を衝突させた時の衝撃荷重のことである)
トルエン中に、2-エチルヘキシルアクリレート100重量部と、2-ヒドロキシエチルアクリレート12.6重量部と、重合開始剤として過酸化ベンゾイル0.25重量部とを加えた後、窒素ガス気流下60℃で重合反応を行い、これにメタクリロイルオキシエチルイソシアネート13.5重量部を加えて付加反応させることで、炭素-炭素二重結合を有するアクリル系共重合体(アクリルポリマーA)のトルエン溶液を得た。
酢酸エチル中に、2-エチルヘキシルアクリレート100重量部と、2-ヒドロキシエチルアクリレート4重量部と、重合開始剤としてアゾビスイソブチロニトリル0.2重量部とを加えた後、70℃に加熱してアクリル系共重合体(アクリルポリマーB)の酢酸エチル溶液を得た。
トルエン中に、ブチルアクリレート70重量部と、2-エチルヘキシルアクリレート30重量部と、アクリル酸3重量部と、4-ヒドロキシブチルアクリレート0.05重量部と、重合開始剤としてアゾビスイソブチロニトリル0.08重量部とを加えた後、70℃に加熱してアクリル系共重合体(アクリルポリマーC)のトルエン溶液を得た。
トルエン中に、ラウリルメタクリレート91重量部と、2-ヒドロキシエチルメタクリレート9.3重量部と、重合開始剤としてアゾビスイソブチロニトリル0.2重量部とを加えた後、窒素ガス気流下60℃で重合反応を行い、これにメタクリロイルオキシエチルイソシアネート9.1重量部を加えて付加反応させることで、炭素-炭素二重結合を有するアクリル系共重合体(アクリルポリマーD)のトルエン溶液を得た。
酢酸エチル中に、2-エチルヘキシルアクリレート95重量部と、アクリル酸5重量部と、重合開始剤として過酸化ベンゾイル0.15重量部とを加えた後、70℃に加熱してアクリル系共重合体(アクリルポリマーE)の酢酸エチル溶液を得た。
トルエン中に、2-エチルヘキシルアクリレート75重量部と、アクリロイルモルフォリン15重量部と、2-ヒドロキシエチルアクリレート22重量部と、重合開始剤として過酸化ベンゾイル0.275重量部とを加えた後、窒素ガス気流下60℃で重合反応を行い、これにメタクリロイルオキシエチルイソシアネート19.8重量部を加えて付加反応させることで、炭素-炭素二重結合を有するアクリル系共重合体(アクリルポリマーF)のトルエン溶液を得た。
トルエン中に、ブチルアクリレート50重量部と、エチルアクリレート39重量部と、2-ヒドロキシエチルアクリレート20重量部と、重合開始剤として過酸化ベンゾイル0.3重量部とを加えた後、窒素ガス気流下60℃で重合反応を行い、これにメタクリロイルオキシエチルイソシアネート21.3重量部を加えて付加反応させることで、炭素-炭素二重結合を有するアクリル系共重合体(アクリルポリマーG)のトルエン溶液を得た。
(粘着剤の調製)
アクリルポリマーAを100重量部含むアクリル系ポリマー溶液Aに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)0.2重量部、α-ヒドロキシケトン系光重合開始剤(BASFジャパン製、商品名「イルガキュア127」、分子量:340.4、波長365nmの吸光係数:1.07×102ml/g・cm)3重量部を加え粘着剤を得た。
(粘着シート)
ポリエチレンテレフタレートフィルム(厚み:50μm)の一方の面に上記の粘着剤を溶剤揮発(乾燥)後の厚みが5μmとなるように塗布して粘着層を形成し、粘着シートを得た。得られた粘着シートの粘着面はセパレータ(三菱ケミカル社製、ダイアホイルMRF)で保護して、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
溶剤揮発(乾燥)後の粘着剤層の厚みを30μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
溶剤揮発(乾燥)後の粘着剤層の厚みを100μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
溶剤揮発(乾燥)後の粘着剤層の厚みを200μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)の配合量を1重量部とし、溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)の配合量を3重量部とし、溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
ポリエチレンテレフタレートフィルムに替えて、セパレータ(三菱ケミカル社製、ダイアホイルMRF)使用し、溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(セパレータ/粘着層/セパレータ)からなる基材レス両面粘着シートを得た。
(粘着剤の調製)
アクリルポリマーBを100重量部含むアクリル系ポリマー溶液Bに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)0.6重量部、架橋促進剤(東京ファインケミカル社製、商品名「エンビライザーOL-1」)0.05重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
(粘着剤の調製)
アクリルポリマーCを100重量部含むアクリル系ポリマー溶液Cに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)1.0重量部、架橋剤(三菱ガス化学(株)製、商品名「テトラッドC」)0.6重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
(粘着剤の調製)
アクリルポリマーDを100重量部含むアクリル系ポリマー溶液Dに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)0.5重量部、α-ヒドロキシケトン系光重合開始剤(BASFジャパン製、商品名「イルガキュア127」、分子量:340.4、波長365nmの吸光係数:1.07×102ml/g・cm)3重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
(粘着剤の調製)
アクリルポリマーEを100重量部含むアクリル系ポリマー溶液Cに、架橋剤(三菱ガス化学(株)製、商品名「テトラッドC」)2.0重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
溶剤揮発(乾燥)後の粘着剤層の厚みを200μmとしたこと以外は、実施例12と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
(粘着剤の調製)
アクリルポリマーFを100重量部含むアクリル系ポリマー溶液Fに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)0.5重量部、α-ヒドロキシケトン系光重合開始剤(BASFジャパン製、商品名「イルガキュア127」、分子量:340.4、波長365nmの吸光係数:1.07×102ml/g・cm)3重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
(粘着剤の調製)
アクリルポリマーGを100重量部含むアクリル系ポリマー溶液Gに、架橋剤(日本ポリウレタン工業株式会社社製、商品名「コロネートL」)0.2重量部、α-ヒドロキシケトン系光重合開始剤(BASFジャパン製、商品名「イルガキュア127」、分子量:340.4、波長365nmの吸光係数:1.07×102ml/g・cm)3重量部を加え粘着剤を得た。
(粘着シート)
溶剤揮発(乾燥)後の粘着剤層の厚みを50μmとしたこと以外は、実施例1と同様にして、(ポリエチレンテレフタレートフィルム/粘着層/セパレータ)からなる粘着シートを得た。
実施例及び比較例で得られた粘着シートについて、以下の評価を行った。結果を表1、2に示す。
TMA Q400(TA-instrument社製)を用いて、Φ1.0mmのプローブを使用し、針入モードにて窒素ガス流量:50.0ml/min、押し込み荷重:0.05N、測定雰囲気温度:-40℃、押し込み負荷時間:20minの条件で、セパレータを剥離して曝露された粘着剤層の沈み込み深さを計測した。測定はN=5で実施し、これら測定値の中の最大値と最小値を除くN=3の平均値をサンプルの沈み込み深さとした。
初期の粘着剤層の厚さに対する沈み込み深さ割合(沈み込み深さ/厚さ×100)を算出した。
粘着シート(幅20mm×長さ50mm)の評価面の粘着剤層とは反対側の面の全面に、両面接着テープ(日東電工株式会社、商品名「No.5600」)を介して、スライドガラス(松浪ガラス工業社製、26mm×76mm)に、2kgハンドローラーを用いて貼着した。
上記のようにして得られた評価用試料のセパレータを剥離し、曝露された該粘着剤層面のプローブタック値を、プローブタック測定機(RHESCA社製、商品名「TACKINESS Model TAC-II」)を用いて、5mmΦのSUS製のプローブ端子にて、プローブ下降速度(Immersion speed):120mm/min、テスト速度(test speed):600mm/min、密着荷重(Prelod):20gf、密着保持時間(press time):1秒の条件で計測した。測定はN=5で実施し、これら測定値の平均値をプローブタック値とした。
また、実施例8の基材を有しない粘着シートは、評価面の粘着剤層とは反対側の面を、上記スライドガラスに、2kgハンドローラーを用いて貼着し、上記同様の条件にてプローブタック値を計測した。
実施例及び比較例の粘着シートのセパレータを剥離し、曝露された粘着剤層面をSUS304に貼着して、当該粘着シートの粘着力を、JIS Z 0237:2000に準じた方法(貼り合わせ条件:2kgローラー1往復、引張速度:300mm/min、剥離角度:180°、測定温度:23℃)により、測定した。
実施例1~7、11及び比較例1、2の紫外線硬化型粘着シートは、該粘着シートのセパレータを剥離し、曝露された粘着剤層面をSUS304に貼着して、当該粘着剤層全面に紫外線照射装置(日東精機製、商品名「UM-810」)を用いて、高圧水銀灯の紫外線(特定波長:365nm、積算光量:460mJ/cm2)を全面に照射し、評価用試料を作製した。得られた該試料の粘着力を、上記同様の条件(JIS Z 0237:2000に準じた方法)により、硬化後の粘着剤層の粘着力を測定した。
また、実施例8の基材を有しない紫外線硬化型粘着シートは、該粘着シートの一方のセパレータのみを剥離し、曝露された粘着剤層面をSUS304に貼着して、当該粘着剤層全面に紫外線照射装置(日東精機製、商品名「UM-810」)を用いて、高圧水銀灯の紫外線(特定波長:365nm、積算光量:460mJ/cm2)を全面に照射し、他方のセパレータを剥離し、その剥離した面に片面粘着テープ(日東電工株式会社、商品名「No.315」)を貼着し、評価用試料を作製した。得られた試料の粘着力を、上記同様の条件(JIS Z 0237:2000に準じた方法)により、測定した。
実施例及び比較例で得られた粘着剤を用いて、厚さ50μmの基材を有しない粘着シートを作製し、該粘着シートを厚さ1.0mm以上になるように積層し、治具を用いてΦ8mmサイズに打抜き、ARES-G2(TA instruments)のプローブにセットした。-45℃から30℃まで5℃毎に、歪み0.05%で0.1Hzから10Hzの周波数で測定した。その後、該分析装置に内蔵されている解析ツールを用いて、基準温度25℃として、WLF式に基づき測定データを掃引し、マスターカーブを合成することで貯蔵弾性率、およびtanδの周波数依存性データを得た。得られたデータから、100kHzの貯蔵弾性率、および損失係数(tanδ)の値を抽出した。
実施例及び比較例で得られた粘着剤を用いて、厚さ50μmの基材を有しない粘着シートを作製し、該粘着シートを厚さ1.0mm以上になるように積層し、治具を用いてΦ8mmサイズに打抜き、ARES-G2(TA instruments)のプローブにセットした。-50℃から200℃まで5℃毎に、歪み0.05%で1Hzの周波数で測定した。得られたデータから、-40℃の貯蔵弾性率、および損失係数(tanδ)の値を抽出した。
粘着シート(幅30mm×長さ30mm)の評価面の粘着剤層とは反対側の面の全面に、両面接着テープ(日東電工株式会社、商品名「No.5603」)を介して、SUS板(厚さ5mm)に、2kgハンドローラーを用いて貼着した。
上記のようにして得られた評価用試料のセパレータを剥離し、曝露された該粘着剤層面に、落球試験機を用いて、1gの鉄球を高さ1mから自由落下させた。該鉄球による粘着剤層面への沈み込み深さを、共焦点レーザー顕微鏡により計測した。次に、該沈み込み深さ(μm)を粘着シートの厚さ(μm)で割り、粘着剤の厚みに対する粘着剤の沈み込み深さの割合(落球試験後の粘着剤沈み込み深さ/厚み×100)を求めた。
また、該落球試験機にて、上記条件で衝撃を加えた際の衝撃荷重Fを計測し、以下の式より衝撃吸収率(%)を求めた。
衝撃吸収率(%)={(F0-F1)/F0}×100
(上記式において、F0は粘着シートを貼着せず、SUS板のみに鉄球を衝突させた時の衝撃荷重のことであり、F1はSUS板と粘着シートとからなる構造体の粘着シート上に鉄球を衝突させた時の衝撃荷重のことである)
また、以下の指標により、落球試験でのキャッチング性を評価した。
〇・・・沈み込み深さの割合:10%以上
△・・・沈み込み深さの割合:7%以上10%未満
×・・・沈み込み深さの割合:7%未満
〔付記1〕少なくとも1層の粘着剤層を有する衝撃吸収粘着シートであって、
前記粘着剤層に対する下記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)が、10%以上であることを特徴とする衝撃吸収粘着シート。
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分
〔付記2〕前記粘着剤層の常温におけるプローブタック値が、10N/cm2以上42N/cm2以下である、付記1に記載の衝撃吸収粘着シート。
〔付記3〕前記粘着剤層の周波数100kHz、25℃での貯蔵弾性率(Pa)の常用対数(Log10G')が7.5以下である、付記1または2に記載の衝撃吸収粘着シート。
〔付記4〕前記粘着剤層の周波数100kHz、25℃での損失係数(tanδ)が0.8以上である、付記1~3のいずれかに記載の衝撃吸収粘着シート。
〔付記5〕前記粘着剤層のステンレスに対する常温での粘着力(前記粘着剤層が放射線硬化性粘着剤から形成される場合は、放射線硬化後の粘着力)が、0.01N/20mm以上4.2N/20mm以下である、付記1~4のいずれかに記載の衝撃吸収粘着シート。
〔付記6〕前記粘着剤層のステンレスに対する常温での粘着力(前記粘着剤層が放射線硬化性粘着剤から形成される場合は、放射線硬化後の粘着力)が、1N/20mm以下である、付記1~5のいずれかに記載の衝撃吸収粘着シート。
〔付記7〕前記粘着剤層が、放射線硬化性粘着剤から形成される、付記1~6のいずれかに記載の衝撃吸収粘着シート。
〔付記8〕前記粘着剤層の厚みが1μm以上200μm以下である、付記1~7のいずれかに記載の衝撃吸収粘着シート。
〔付記9〕前記粘着剤層が、アクリル系粘着剤から形成される、付記1~8のいずれかに記載の衝撃吸収粘着シート。
〔付記10〕前記衝撃吸収粘着シートが、少なくとも1層の基材を有する、付記1~9のいずれかに記載の衝撃吸収粘着シート。
〔付記11〕前記基材が、ポリエステルフィルムから形成される、付記10に記載の衝撃吸収粘着シート。
〔付記12〕仮固定材上に配置された電子部品を前記粘着剤層で受け取るために使用される、付記1~11のいずれかに記載の衝撃吸収粘着シート。
〔付記13〕前記仮固定材の電子部品が配置された面と、前記衝撃吸収粘着シートの粘着剤層の粘着面とが対向して、隙間を設けて配置される、付記12に記載の衝撃吸収粘着シート。
〔付記14〕仮固定材上に配置された電子部品を、少なくとも1層の粘着剤層を有する衝撃吸収粘着シートの前記粘着剤層の粘着面で受け取る工程を含み、前記粘着層が下記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)が、10%以上であることを特徴とする電子部品の加工方法。
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分
〔付記15〕仮固定材上に電子部品が配置された面と、前記衝撃吸収粘着シートの粘着剤層の粘着面とが対向して、隙間を設けて配置される、付記14に記載の電子部品の加工方法。
〔付記16〕前記衝撃吸収粘着シート上の電子部品を、他の粘着シート又は他の基板上に配置する工程と、前記衝撃吸収粘着シートの粘着剤層の粘着面上から、電子部品を剥離する工程とを含む、付記14又は15に記載の電子部品の加工方法。
10、20 粘着剤層
11、21 基材
22 粘着剤層(その他の粘着剤層)
30 仮固定材(基板、もしくは粘着シート)
31 電子部品
40 粘着シート又は基板
Claims (16)
- 少なくとも1層の粘着剤層を有する衝撃吸収粘着シートであって、
前記粘着剤層に対する下記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)が、10%以上であることを特徴とする衝撃吸収粘着シート。
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分 - 前記粘着剤層の常温におけるプローブタック値が、10N/cm2以上42N/cm2以下である、請求項1に記載の衝撃吸収粘着シート。
- 前記粘着剤層の周波数100kHz、25℃での貯蔵弾性率(Pa)の常用対数(Log10G')が7.5以下である、請求項1または2に記載の衝撃吸収粘着シート。
- 前記粘着剤層の周波数100kHz、25℃での損失係数(tanδ)が0.8以上である、請求項1~3のいずれかに記載の衝撃吸収粘着シート。
- 前記粘着剤層のステンレスに対する常温での粘着力(前記粘着剤層が放射線硬化性粘着剤から形成される場合は、放射線硬化後の粘着力)が、0.01N/20mm以上4.2N/20mm以下である、請求項1~4のいずれかに記載の衝撃吸収粘着シート。
- 前記粘着剤層のステンレスに対する常温での粘着力(前記粘着剤層が放射線硬化性粘着剤から形成される場合は、放射線硬化後の粘着力)が、1N/20mm以下である、請求項1~5のいずれかに記載の衝撃吸収粘着シート。
- 前記粘着剤層が、放射線硬化性粘着剤から形成される、請求項1~6のいずれかに記載の衝撃吸収粘着シート。
- 前記粘着剤層の厚みが1μm以上200μm以下である、請求項1~7のいずれかに記載の衝撃吸収粘着シート。
- 前記粘着剤層が、アクリル系粘着剤から形成される、請求項1~8のいずれかに記載の衝撃吸収粘着シート。
- 前記衝撃吸収粘着シートが、少なくとも1層の基材を有する、請求項1~9のいずれかに記載の衝撃吸収粘着シート。
- 前記基材が、ポリエステルフィルムから形成される、請求項10に記載の衝撃吸収粘着シート。
- 仮固定材上に配置された電子部品を前記粘着剤層で受け取るために使用される、請求項1~11のいずれかに記載の衝撃吸収粘着シート。
- 前記仮固定材の電子部品が配置された面と、前記衝撃吸収粘着シートの粘着剤層の粘着面とが対向して、隙間を設けて配置される、請求項12に記載の衝撃吸収粘着シート。
- 仮固定材上に配置された電子部品を、少なくとも1層の粘着剤層を有する衝撃吸収粘着シートの前記粘着剤層の粘着面で受け取る工程を含み、前記粘着層が下記条件の熱機械分析(TMA)による沈み込み深さの前記粘着剤層の厚さに対する割合(沈み込み深さ/厚さ×100)が、10%以上であることを特徴とする電子部品の加工方法。
・熱機械分析(TMA)
プローブ直径:1.0mm
モード:針入モード
押し込み荷重:0.05N
測定雰囲気温度:-40℃
押し込み負荷時間:20分 - 仮固定材上に電子部品が配置された面と、前記衝撃吸収粘着シートの粘着剤層の粘着面とが対向して、隙間を設けて配置される、請求項14に記載の電子部品の加工方法。
- 前記衝撃吸収粘着シート上の電子部品を、他の粘着シート又は他の基板上に配置する工程と、前記衝撃吸収粘着シートの粘着剤層の粘着面上から、電子部品を剥離する工程とを含む、請求項14又は15に記載の電子部品の加工方法。
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WO2023136145A1 (ja) * | 2022-01-11 | 2023-07-20 | 日東電工株式会社 | 樹脂組成物 |
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KR20230127258A (ko) | 2023-08-31 |
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