WO2021166560A1 - 離型フィルムおよび電子装置の製造方法 - Google Patents
離型フィルムおよび電子装置の製造方法 Download PDFInfo
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- WO2021166560A1 WO2021166560A1 PCT/JP2021/002452 JP2021002452W WO2021166560A1 WO 2021166560 A1 WO2021166560 A1 WO 2021166560A1 JP 2021002452 W JP2021002452 W JP 2021002452W WO 2021166560 A1 WO2021166560 A1 WO 2021166560A1
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- WIPO (PCT)
- Prior art keywords
- release film
- heat
- layer
- electronic components
- release
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/60—Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation
- H01L21/603—Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation involving the application of pressure, e.g. thermo-compression bonding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
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- B32B2037/268—Release layers
Definitions
- the present invention relates to a method for manufacturing a release film and an electronic device.
- film-like adhesives such as Anisotropic Conductive Film (ACF) and Non Conductive Adhesive Film (NCF) are used in electronic devices.
- Adhesives such as ACF and NCF include thermosetting resins such as epoxy resins.
- a release film for preventing adhesion between the heat-pressurizing head portion and the electronic component between the heating-pressurizing head portion for heating and pressurizing and the electronic component is placed.
- Patent Document 1 Patent No. 6470461.
- Patent Document 1 when the crimping object is heat-crimped by the heat-pressurizing head, the crimping object and the heat-pressing head are supplied and arranged between the crimping object and the heat-pressurizing head.
- a heat-resistant release sheet that prevents sticking, and has a polyimide base material and a polytetrafluoroethylene (PTFE) layer arranged on one main surface of the polyimide base material, and constitutes the PTFE layer. Describes a heat-resistant mold release sheet having a number average molecular weight of 6 million or more and a peeling force required to peel the PTFE layer from the polyimide substrate of 0.5 N / 20 mm or more.
- TSV through silicon via
- electronic components such as semiconductor chips can be laminated to form a three-dimensional structure, so that it is possible to achieve a significantly higher density and smaller size than conventional devices.
- the heater is heated to a higher temperature than before so that heat is transferred to the underlying chip.
- the heater temperature is higher than before. Along with this, further heat resistance is required for the release film.
- the adhesive attached to the release film will fall off during the production line, causing contamination or stoppage of the production line and reducing the product yield.
- the detailed reason why a part of the adhesive adheres to the release film is not clear, but the following reasons can be considered.
- the release film is heated to 300 ° C. or higher. At this time, it is considered that the resin component constituting the adhesive is in a molten state, and the release layer of the release film is softened to be in a state close to the molten state. Then, a part of the melted adhesive and a part of the release layer close to the melted state are compatible with each other.
- the heat resistance of the release film can be improved.
- a heat-resistant resin such as polyimide for the support layer.
- the heat-resistant release film does not transfer heat well to the adhesive located between the two electronic components in the process of heat-pressing the electronic components with each other. It became clear that there were cases. Therefore, the heat-resistant release film was inferior in thermal conductivity to electronic components. That is, the present inventors have a good balance between the thermal conductivity to the electronic components and the releasability from the electronic components when the electronic components are heat-bonded to each other at a high temperature in the conventional release film. We found that there was room for improvement in terms of doing so.
- the present invention has been made in view of the above circumstances, and is a release film having an excellent balance between thermal conductivity to electronic components and releasability from electronic components when heat-bonding electronic components to each other at a high temperature. Is to provide.
- the present inventors have made extensive studies to achieve the above problems.
- the release film provided with the heat-resistant resin layer (A) and the release layer (B) containing the fluororesin, and the thickness of each layer and the total thickness are in a specific range, heats the electronic components to high temperatures.
- the heat conductivity to the electronic component and the releasability from the electronic component are excellent in the heat crimping with the above, and have reached the present invention.
- the following methods for manufacturing a release film and an electronic device are provided.
- a release film used for joining electronic components by heat crimping Heat-resistant resin layer (A) and A mold release layer (B) arranged on one surface of the heat-resistant resin layer (A) and containing a fluorine-based resin is provided.
- the thickness of the heat-resistant resin layer (A) is less than 25 ⁇ m.
- the thickness of the release layer (B) is 5 ⁇ m or less.
- the heat-resistant resin layer (A) is polyimide, polyetherimide, polyamideimide, polyamide, liquid crystal polymer, polyester, polycarbonate, modified polyphenylene ether, polyacetal, polyarylate, polysulfone, polyethersulfone, polyphenylene sulfide, polyether ether ketone, A release film containing one or more selected from the group consisting of vinylidene chloride resin, polybenzoimidazole, polybenzoxazole, polymethylpentene, silicone resin and crosslinked products thereof.
- the heat-resistant resin layer (A) release film storage modulus E ' is 1.0 ⁇ 10 8 Pa or more at 330 ° C. for.
- a method of manufacturing an electronic device including. [8] In the method for manufacturing an electronic device according to the above [7], A method for manufacturing an electronic device in which the thermosetting adhesive contains a non-conductive film. [9] In the method for manufacturing an electronic device according to the above [7] or [8].
- a method for manufacturing an electronic device in which the heating temperature of the heating head in the batch joining step is 300 ° C. or higher.
- the present invention it is possible to provide a release film having an excellent balance between thermal conductivity to electronic components and releasability from electronic components when electronic components are heat-bonded to each other at a high temperature.
- FIG. 1 is a cross-sectional view schematically showing an example of the structure of the release film 50 according to the embodiment of the present invention.
- the release film 50 is a release film used for joining electronic parts by heat-bonding, and is a heat-resistant resin layer (A) and a heat-resistant resin layer (A).
- the heat-resistant resin layer (A) has a thickness of less than 25 ⁇ m
- the release layer (B) has a thickness of the release layer (B). It is 5 ⁇ m or less, and the thickness of the release film is less than 25 ⁇ m.
- the present inventors have diligently studied in order to realize a release film having an excellent balance between thermal conductivity to electronic components and releasability from electronic components when heat-pressing electronic components with each other at a high temperature.
- the heat-resistant resin layer (A) and the release layer (B) containing the fluorine-based resin are provided and the thickness of each layer and the total thickness are within the above ranges, the electronic components are heat-bonded to each other.
- the adhesion of adhesives can be suppressed, the releasability can be improved, and the thermal conductivity to electronic components can be improved.
- the release film 50 according to the present embodiment is provided with the heat-resistant resin layer (A) to improve the heat resistance of the release film 50, and also contains the heat-resistant resin layer (A) and the fluororesin.
- the thickness of the layer (B) and the release film 50 can be made relatively thin, and as a result, the thermal conductivity of the release film 50 can be maintained well. That is, the release film 50 according to the present embodiment includes a heat-resistant resin layer (A) and a release layer (B) containing a fluororesin, and the thickness of each layer and the total thickness are within the above ranges.
- the total thickness of the release film 50 according to the present embodiment is less than 25 ⁇ m, but it is preferably 23 ⁇ m or less from the viewpoint of further improving the thermal conductivity to the electronic components when the electronic components are heat-bonded to each other at a high temperature. 22 ⁇ m or less is more preferable, 20 ⁇ m or less is further preferable, 18 ⁇ m or less is even more preferable, and 15 ⁇ m or less is even more preferable.
- the thickness of the entire release film 50 according to the present embodiment is preferably more than 5 ⁇ m, more preferably more than 8 ⁇ m, and even more preferably more than 10 ⁇ m. When the thickness of the heat-resistant resin layer (A) is at least the above lower limit value, the heat resistance, transportability, handleability, etc.
- the thickness of the heat-resistant resin layer (A) is at least the above lower limit value
- the heat resistance of the release film 50 is further improved, and when the electronic parts are heat-bonded to each other at a high temperature, the electronic parts are separated from the electronic parts.
- the releasability can be further improved.
- the release film 50 according to this embodiment is used for joining electronic components by heat crimping. More specifically, an adhesive such as ACF or NCF can be placed between the two electronic components to be used as a release film used in the step of heat-pressing the electronic components with each other. Further, the release film 50 according to the present embodiment can be suitably used as a release film used in the step of batch joining three or more electronic components.
- a step of batch-bonding three or more electronic components a multi-stage batch bonding process in which three or more electronic components are laminated by pre-bonding and then three or more electronic components are batch-bonded by post-bonding is performed.
- the release film 50 according to the present embodiment is not limited to electrical connection between electronic components using an adhesive such as ACF or NCF, and can be widely used for joining electronic components by heat crimping.
- the types of electronic components to be bonded are not particularly limited, but for example, semiconductor chips such as ICs, LSIs, discretes, light emitting diodes, and light receiving elements, semiconductor panels, semiconductor packages, interposers; various substrates such as metal substrates and glass substrates ( Electrodes may be provided on the substrate); various circuits such as a printed circuit board, TCP (Tape Carrier Package), and FPC (Flexible Printed Circuit) (ICs and the like may be provided on TCP and FPC). ); A transparent conductive layer such as an ITO (Indium Tin Oxide) layer; and the like.
- the release film 50 can also be used for joining electronic components in which a plurality of different electronic components are modularized.
- the heat-resistant resin layer (A) is a heat-resistant resin layer, and is a layer on the side heated by a heat source, that is, the side in contact with the heating and pressurizing head portion when the electronic components are joined by heat crimping.
- the heat-resistant resin layer (A) By providing the heat-resistant resin layer (A), the mechanical properties of the release film 50 can be improved, and the transportability and handleability of the release film 50 can be improved. Further, it is possible to suppress the softening of the release layer (B) when the electronic components are heat-bonded to each other, and as a result, a part of the melted adhesive and a part of the release layer (B) are compatible with each other. It is possible to prevent it from being stored.
- heat resistance means dimensional stability and thermal decomposition stability at high temperatures. That is, the better the heat resistance, the less likely it is that deformation, melting, decomposition, etc. such as expansion, contraction, softening, etc. at high temperature will occur.
- the heat-resistant resin layer (A) may be used alone or in combination of two or more.
- the heat-resistant resin layer (A) contains a heat-resistant resin.
- the heat-resistant resin layer means, for example, a layer containing a heat-resistant resin as a main component.
- the main component means the resin component contained most.
- the heat-resistant resin layer (A) is not particularly limited, and examples thereof include a resin film.
- the heat-resistant resin layer (A) contains a heat-resistant resin.
- the heat-resistant resin constituting the heat-resistant resin layer (A) include polyimide, polyetherimide, polyamideimide, polyamide, liquid crystal polymer, polyester, polycarbonate, modified polyphenylene ether, polyacetal, polyarylate, polysulfone, and polyethersulfone. , Polyphenylene sulfide, polyether ether ketone, vinylidene chloride resin, polybenzoimidazole, polybenzoxazole, polymethylpentene, silicone resin, crosslinked products thereof, and the like.
- one or more selected from polyimide, polyamide, polyetheretherketone and polyester are preferable, and polyimide is more preferable, from the viewpoint of excellent balance of heat resistance, mechanical strength, transparency, price and the like.
- the heat-resistant resin constituting the heat-resistant resin layer (A) preferably has a softening point, a glass transition temperature, or a melting point of 200 ° C. or higher, more preferably 220 ° C. or higher.
- the heat-resistant resin constituting the heat-resistant resin layer (A) preferably has neither a softening point, a glass transition temperature, nor a melting point, and more preferably has a decomposition temperature of 200 ° C. or higher, and decomposes. It is more preferable that the temperature is 220 ° C. or higher. When such a heat-resistant resin is used, the heat resistance of the heat-resistant resin layer (A) can be further improved.
- the storage elastic modulus E'of the heat-resistant resin layer (A) at 330 ° C. is determined from the viewpoint of further suppressing the adhesion of the adhesive when heat-bonding the electronic components to each other. It is preferably 1.0 ⁇ 10 8 Pa or more, more preferably 5.0 ⁇ 10 8 Pa or more, and further preferably 1.0 ⁇ 10 9 Pa or more. Further, in the release film 50 according to the present embodiment, the upper limit of the storage elastic modulus E'of the heat-resistant resin layer (A) at 330 ° C. is not particularly limited, but is, for example, 1.0 ⁇ 10 10 Pa or less.
- the storage elastic modulus E'of the heat-resistant resin layer (A) at 330 ° C. can be controlled within the above range by, for example, controlling the type and resin composition of the resin constituting the heat-resistant resin layer (A). ..
- the thickness of the heat-resistant resin layer (A) is less than 25 ⁇ m, but it is preferably less than 23 ⁇ m, preferably less than 20 ⁇ m, from the viewpoint of further improving the thermal conductivity to the electronic components when the electronic components are heat-bonded to each other at a high temperature. Is even more preferable, less than 18 ⁇ m is even more preferable, and less than 15 ⁇ m is even more preferable.
- the thickness of the heat-resistant resin layer (A) is preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, and further preferably 10 ⁇ m or more. When the thickness of the heat-resistant resin layer (A) is at least the above lower limit value, the heat resistance, transportability, handleability, etc. of the release film 50 can be improved.
- the heat resistance of the release film 50 is further improved, and when the electronic parts are heat-bonded to each other at a high temperature, the electronic parts are separated from the electronic parts.
- the releasability can be further improved.
- the heat-resistant resin layer (A) may be a single layer or two or more types of layers.
- the heat-resistant resin layer (A) may be surface-treated in order to improve the adhesiveness with other layers. Specifically, corona treatment, plasma treatment, undercoat treatment, primer coating treatment and the like may be performed.
- the release layer (B) is a layer having releasability, and is a layer arranged so as to face the electronic component when the electronic components are joined by heat crimping (that is, a layer arranged on the electronic component side). ), which is a layer provided for peeling the release film 50 from the electronic components after heat-pressing the electronic components with each other.
- the release layer (B) is not particularly limited, and examples thereof include a coating layer and a resin film.
- having releasability means, for example, a case where the contact angle with water is 80 ° or more.
- the release layer (B) contains a fluorine-based resin.
- the fluororesin according to the present embodiment is a resin containing one or more structures selected from the group consisting of a perfluoroalkyl group and a perfluoropolyether skeleton from the viewpoint of further improving the releasability. More preferred.
- the number average molecular weight of the fluororesin is preferably 100,000 or more, more preferably 200,000 or more, and more preferably 500,000 or more, from the viewpoint of suppressing the adhesion of the fluorine component to the surface of the electronic component and the releasability at high temperature. Even more preferably, 1 million or more is even more preferable.
- the upper limit of the number average molecular weight of the fluororesin is preferably less than 6 million, more preferably 5 million or less, further preferably 4.5 million or less, and even more preferably 4 million or less.
- a homogeneous release layer (B) can be formed when a dispersion liquid or solution of a fluororesin is formed.
- the number average molecular weight of the fluororesin is measured by differential scanning calorimetry (DSC) based on the method described in Suwa et al., Journal of Applied Polymer Science, vol. 17, pp. 3253-3257 (1973). be able to.
- fluororesin examples include PTFE (polytetrafluoroethylene), PVDF (polyfluorovinylidene), PCTFE (polychlorotrifluoroethylene), PVF (polyfluorovinyl), and PFA (tetrafluoroethylene).
- PTFE polytetrafluoroethylene
- PVDF polyfluorovinylidene
- PCTFE polychlorotrifluoroethylene
- PVF polyfluorovinyl
- PFA tetrafluoroethylene
- Perfluoroalkoxyethylene copolymer FEP (tetrafluoroethylene and hexafluoropropylene copolymer), ETFE (tetrafluoroethylene and ethylene copolymer), ECTFE (chlorotrifluoroethylene and ethylene) , A ternary copolymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride, one or more selected from fluororubber and the like.
- PTFE polytetrafluoroethylene
- FEP copolymer of tetrafluoroethylene and hexafluoropropylene
- PFA coweight of tetrafluoroethylene and perfluoroalkoxyethylene
- One or more fluororesins selected from the group consisting of (coalescence) are more preferable.
- the polytetrafluoroethylene include "Polyflon PTFE” manufactured by Daikin Industries, Ltd. and "Teflon (registered trademark) PTFE” manufactured by Mitsui-Kemers Fluoro Products.
- Examples of the copolymer of tetrafluoroethylene and hexafluoropropylene include "Neophron FEP” manufactured by Daikin Industries, Ltd. and “Teflon (registered trademark) FEP” manufactured by Mitsui-Kemers Fluoro Products. ..
- Examples of the copolymer of tetrafluoroethylene and perfluoroalkoxy alkane include "Neophron PFA” manufactured by Daikin Industries, Ltd., “Teflon (registered trademark) PFA” manufactured by Mitsui-Kemers Fluoro Products, etc. can.
- the fluorine-based resin according to this embodiment is bonded to a layer constituting a release film, which is in contact with a release layer (B) such as a heat-resistant resin layer (A) and a primer layer (P), at a temperature of less than 200 ° C. It is preferable to have a possible reactive group.
- a possible reactive group examples include a hydroxyl group, a carboxyl group, an amino group, a vinyl group, a styryl group, a (meth) acrylic group, and an epoxy group. Examples thereof include a mercapto group, an alkoxysilyl group and an isocyanate group.
- the alkoxysilyl group is preferable because it can increase the concentration of the fluorine-based resin on the surface of the release film.
- the alkoxysilyl group include a methoxysilyl group, an ethoxysilyl group, an isopropoxysilyl group and the like. From the viewpoint of reactivity, a methoxysilyl group and an ethoxysilyl group are preferable.
- the release layer (B) may contain a conductive material.
- a conductive material is not particularly limited, and examples thereof include carbon particles.
- the release layer (B) is preferably a fluorine-based coating layer from the viewpoint that the thickness of the release layer (B) can be reduced.
- the fluorine-based coating layer With the fluorine-based coating layer, the thickness of the release layer (B) can be reduced, so that the softening of the release layer (B) when the electronic components are heat-bonded to each other can be further suppressed, and as a result, the softening of the release layer (B) can be further suppressed. It is possible to further suppress that a part of the melted adhesive and a part of the release layer (B) are compatible with each other. This makes it possible to further suppress the adhesion of the adhesive when heat-bonding the electronic components to each other.
- the fluorine-based coating layer can be formed, for example, by applying a fluorine-based coating agent containing a fluorine-based resin to the heat-resistant resin layer (A) and drying it.
- the fluorine-based coating agent may be a latex of a fluorine-based resin or a solution of a fluorine-based resin.
- the thickness of the release layer (B) is 5 ⁇ m or less, but from the viewpoint of further improving the thermal conductivity to the electronic components when heat-bonding the electronic components to each other at a high temperature, and further suppressing the adhesion of the adhesive. From the viewpoint, it is preferably 4 ⁇ m or less, more preferably 3 ⁇ m or less.
- the lower limit of the thickness of the release layer (B) is not particularly limited, but is, for example, 0.01 ⁇ m or more.
- the release layer (B) may be a single layer or two or more types of layers. Further, the release layer (B) may be surface-treated in order to improve the adhesiveness with other layers. Specifically, corona treatment, plasma treatment, undercoat treatment, primer coating treatment and the like may be performed.
- the release film 50 has a lower layer of the release layer (B), that is, a release layer (B) and a heat-resistant resin layer from the viewpoint of improving the coatability and the release property of the release layer (B).
- a primer layer (P) may be provided between (A).
- the primer layer (P) preferably has a siloxane bond (—Si—O—), a precursor of a silane compound having a siloxane bond, or a silanol group.
- primer layer having a siloxane bond or silanol group examples include a silica film obtained by heating perhydropolysilazane (PHPS) in the air or a steam atmosphere, a silica film obtained by a sol-gel reaction of alkoxysilane, and the like. Can be mentioned.
- PHPS perhydropolysilazane
- the thickness of the primer layer (P) is, for example, 0.001 ⁇ m or more and 1 ⁇ m or less.
- the release film 50 according to the present embodiment has, for example, an adhesive layer, an uneven absorption layer, and an impact between the heat-resistant resin layer (A) and the release layer (B) as long as the effects of the present embodiment are not impaired. It may further have an absorption layer or the like.
- the method for producing the release film 50 according to the present embodiment is not particularly limited, and a generally known method for producing a laminated film can be adopted.
- the release film 50 according to the present embodiment is produced by using one of known production methods such as a coextrusion molding method, a laminating method, an extrusion coating method, and a coating method alone or in combination of two or more. be able to.
- an appropriate production method can be selected from the known production methods of the laminated film.
- the release film 50 according to the present embodiment can also be obtained by, for example, forming a primer layer (P) on the heat-resistant resin layer (A) and then coating the release layer (B).
- the method for forming the primer layer (P) and the release layer (B) is not particularly limited, and examples thereof include a method of applying and drying a compound solution forming each layer.
- the release film 50 according to this embodiment is used for joining electronic components by heat crimping. More specifically, the release film 50 according to the present embodiment is suitably used for manufacturing an electronic device in which a first electronic component and a second electronic component are bonded via a thermosetting adhesive. Can be done.
- the method for manufacturing an electronic device using the release film 50 according to the present embodiment is, for example, between a second electronic component arranged on the first electronic component via a heat-curable adhesive and a heating head. With the release film 50 arranged so that the release layer (B) side faces the second electronic component, the first electronic component is pressed by the heating head toward the first electronic component. And the step of electrically connecting the second electronic component by heat crimping is included.
- thermosetting adhesive for example, a film-like adhesive such as a known anisotropic conductive adhesive film or non-conductive adhesive film can be used. Further, a known anisotropic conductive adhesive paste or non-conductive adhesive paste may be used. Among these, a non-conductive adhesive film is preferable because a metal connection is preferably selected for the connection of electronic components. As the non-conductive adhesive film, for example, a known non-conductive adhesive film can be used.
- a method for manufacturing an electronic device when the release film 50 according to the present embodiment is used as a release film used in a step of batch joining three or more electronic components the following methods can be mentioned.
- a manufacturing method for manufacturing an electronic device in which three or more electronic parts are bonded via a thermosetting adhesive a laminate in which three or more electronic parts are laminated is prepared via a thermosetting adhesive.
- the release film 50 according to the present embodiment is arranged between the laminate and the heating head so that the release layer (B) side faces the laminate, and the laminate is subjected to the heating head.
- the electronic components may be temporarily bonded to each other by prebonding.
- the heating temperature of the heating head is, for example, less than 330 ° C.
- the time for pressing the laminate by the heating head is, for example, 1 second or less.
- the heating temperature of the heating head in the batch joining step is, for example, 300 ° C. or higher, preferably 330 ° C. or higher, in order to sufficiently join three or more electronic components in a batch.
- the time for pressing the laminated body by the heating head in the batch joining step is, for example, 5 seconds or more, preferably 8 seconds or more.
- the electronic components are not particularly limited, but for example, semiconductor chips such as ICs, LSIs, discretes, light emitting diodes, and light receiving elements, semiconductor panels, semiconductor packages, interposers; metal substrates and Various substrates such as glass substrates (electrodes may be provided on the substrate); Various circuits such as printed circuit boards, TCP (Tape Carrier Package), FPC (Flexible Printed Circuit) (ICs on TCP and FPC) Etc.); a transparent conductive layer such as an ITO (Indium Tin Oxide) layer; and the like.
- semiconductor chips such as ICs, LSIs, discretes, light emitting diodes, and light receiving elements, semiconductor panels, semiconductor packages, interposers; metal substrates and Various substrates such as glass substrates (electrodes may be provided on the substrate); Various circuits such as printed circuit boards, TCP (Tape Carrier Package), FPC (Flexible Printed Circuit) (ICs on TCP and FPC)
- A1 Polyimide film (manufactured by Toray DuPont Co., Ltd., product name: Kapton 50H, thickness: 12.5 ⁇ m, storage elastic modulus at 330 ° C. E': 1.8 ⁇ 10 9 Pa)
- A2 Polyimide film (manufactured by Toray DuPont Co., Ltd., product name: Kapton 100H, thickness: 25 ⁇ m, storage elastic modulus at 330 ° C.
- A3 polyimide film (Du Pont-Toray Co., Ltd., product name: Kapton 80EN, Product Name: Thickness: 20 [mu] m, storage elastic modulus E at 330 °C ': 6.1 ⁇ 10 8 Pa)
- the storage elastic modulus E'of the heat-resistant resin layer (A) at 330 ° C. was measured by the following method. Heat resistance using a solid viscoelasticity measuring device (RSA-3, manufactured by TA Instruments) under the conditions of frequency 1 Hz, heating rate 3 ° C / min, strain 0.05%, chuck distance 20 mm, and sample width 10 mm. The solid viscoelasticity of the sex resin layer (A) was measured, and the storage elastic modulus E'of the heat-resistant resin layer (A) at 330 ° C. was calculated.
- RSA-3 solid viscoelasticity measuring device
- B1 Polytetrafluoroethylene (PTFE) dispersion liquid 1 (manufactured by Daikin Corporation, product name: Polyfluon-D, number average molecular weight of PTFE: 3.4 million)
- B2 Polytetrafluoroethylene film (manufactured by Nitto Denko KK, product name: Nitoflon No. 900UL, number average molecular weight of PTFE: 7.5 million)
- the number average molecular weight of PTFE in B1 and B2 is determined by differential scanning calorimetry (DSC) based on the method described in Suwa et al., Journal of Applied Polymer Science, vol. 17, pp. 3253-3257 (1973). It was measured.
- the thickness of the release layer (B) was measured using a dial gauge, and the average value of three points at both ends and the center in the width direction of the film was adopted.
- Example 1 Polytetrafluoroethylene (PTFE) dispersion 1 was applied onto the heat-resistant resin layer (A1). Then, it was dried at a temperature of 100 ° C. for 5 minutes and then fired at 350 ° C. for 10 minutes to form a release layer (B1) having a thickness of 2.5 ⁇ m to obtain a release film.
- PTFE tetrafluoroethylene
- Example 2 A release film was obtained by the same operation as in Example 1 except that the release layer (B1) had a thickness of 5 ⁇ m.
- Example 3 A release film was obtained by the same operation as in Example 1 except that (A3) was used for the heat-resistant resin layer and the thickness of the release layer (B1) was 2.5 ⁇ m.
- Adhesive adhesion evaluation when heat-bonding electronic components to each other NCF (underfill insulating film described in Example 1 of JP-A-2018-22819) was adhered on a silicon wafer.
- the release films obtained in Examples and Comparative Examples were laminated on NCF, and the obtained laminate was pressed for 30 seconds under the conditions of 350 ° C. and a pressure bonding pressure of 0.6 MPa.
- the laminate was then cooled to room temperature and then the release film was stripped from the NCF.
- the surface of the release film was observed, and the presence or absence of NCF adhesion was evaluated according to the following criteria.
- the sizes of the release film and NCF are 1x5 cm and 1x1 cm, respectively.
- the film of the example has a higher temperature of the chip-shaped object than the release film of the comparative example, so that heat can be transferred to the chip-shaped object better. It was confirmed that it has excellent thermal conductivity.
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Abstract
Description
ACFやNCF等の接着剤は、例えばエポキシ樹脂等の熱硬化性樹脂を含んでいる。2つの電子部品の間に接着剤を配置し、電子部品同士を加熱圧着すると、接着剤に含まれる熱硬化性樹脂が熱によって硬化して、電子部品同士を接合することができる。
ここで、電子部品同士を加熱圧着する工程では、加熱加圧するための加熱加圧ヘッド部と電子部品との間に、加熱加圧ヘッド部と電子部品との接着を防止するための離型フィルムが配置される。
本技術では、複数の電子部品を積み上げた後に加熱圧着するため、下層のチップにまで熱が伝わるように、従来よりもヒーターを高温化している。特に、3以上の電子部品をプレボンディングにより積層し、次いで、ポストボンディングにより、積層した3以上の電子部品を一括接合する多段一括ボンディングプロセスにおいて、ヒーター温度は従来よりもさらに高温化している。それに伴い、離型フィルムにおいても、更なる耐熱性が要求されている。
従来、フッ素系樹脂フィルム等が、当該用途の離型フィルムとして使用されている。2つの電子部品の間にACFやNCF等の接着剤を配置して、高温下で電子部品同士を加熱圧着する場合、高温になるほど接着剤を構成する樹脂成分と、離型フィルムとが溶融して融着するため、接着剤の一部が離型フィルムに付着してしまう場合があることが明らかになった。
接着剤の一部が離型フィルムに付着してしまうと、離型フィルムに付着した接着剤が、製造ライン中に脱落し、製造ラインの汚染や停止が起こり、製品の歩留まりが低下してしまう懸念がある。
接着剤の一部が離型フィルムに付着してしまう詳細な理由は明らかではないが、以下の理由が考えられる。電子部品同士を加熱圧着する場合、例えば、離型フィルムは300℃以上に加熱される。このとき、接着剤を構成する樹脂成分は溶融状態になっており、さらに離型フィルムの離型層が軟化して溶融状態に近い状態になっていると考えられる。そして、溶融した接着剤の一部と、溶融状態に近い離型層の一部とが相溶してしまう。これにより、電子部品から離型フィルムを剥離した際に、接着剤の一部が離型フィルムの離型層の表面に残ってしまい、その結果、接着剤の一部が離型フィルムに付着してしまうと考えられる。
すなわち、本発明者らは、従来の離型フィルムには、電子部品同士を高温で加熱圧着する際において、電子部品への熱伝導性と、電子部品からの離型性とのバランスを良好にするという観点において、改善の余地があることを見出した。
電子部品の加熱圧着による接合に用いられる離型フィルムであって、
耐熱性樹脂層(A)と、
上記耐熱性樹脂層(A)の一面上に配置され、かつ、フッ素系樹脂を含む離型層(B)と、を備え、
上記耐熱性樹脂層(A)の厚みが25μm未満であり、
上記離型層(B)の厚みが5μm以下であり、
上記離型フィルムの厚みが25μm未満である離型フィルム。
[2]
上記[1]に記載の離型フィルムにおいて、
上記耐熱性樹脂層(A)がポリイミド、ポリエーテルイミド、ポリアミドイミド、ポリアミド、液晶ポリマー、ポリエステル、ポリカーボネート、変性ポリフェニレンエーテル、ポリアセタール、ポリアリレート、ポリスルホン、ポリエーテルスルホン、ポリフェニレンスルフィド、ポリエーテルエーテルケトン、塩化ビニリデン樹脂、ポリベンゾイミダゾール、ポリベンゾオキサゾール、ポリメチルペンテン、シリコーン樹脂およびこれらの架橋物からなる群から選択される一種または二種以上を含む離型フィルム。
[3]
上記[1]または[2]に記載の離型フィルムにおいて、
上記耐熱性樹脂層(A)の330℃における貯蔵弾性率E’が1.0×108Pa以上である離型フィルム。
[4]
上記[1]乃至[3]のいずれか一つに記載の離型フィルムにおいて、
上記フッ素系樹脂がパーフルオロアルキル基およびパーフルオロポリエーテル骨格からなる群から選択される一種または二種以上の構造を含む離型フィルム。
[5]
上記[1]乃至[4]のいずれか一つに記載の離型フィルムにおいて、
上記フッ素系樹脂がポリテトラフルオロエチレン、テトラフルオロエチレンとヘキサフルオロプロピレンとの共重合体、およびテトラフルオロエチレンとパーフルオロアルコキシエチレンとの共重合体からなる群から選択される一種または二種以上を含む離型フィルム。
[6]
上記[1]乃至[5]のいずれか一つに記載の離型フィルムにおいて、
3以上の電子部品を一括接合するために用いられる離型フィルム。
[7]
3以上の電子部品が熱硬化型接着剤を介して接合された電子装置を製造するための製造方法であって、
上記熱硬化型接着剤を介して、3以上の上記電子部品が積層された積層体を準備する準備工程と、
上記積層体と、加熱ヘッドとの間に、上記[1]乃至[6]のいずれか一つに記載の離型フィルムを上記離型層(B)側が上記積層体に向くように配置した状態で、上記加熱ヘッドにより上記積層体を押圧することにより、隣接する上記電子部品同士を加熱圧着により電気的に接続する一括接合工程と、
を含む電子装置の製造方法。
[8]
上記[7]に記載の電子装置の製造方法において、
上記熱硬化型接着剤が非導電性フィルムを含む電子装置の製造方法。
[9]
上記[7]または[8]に記載の電子装置の製造方法において、
上記一括接合工程における上記加熱ヘッドの加熱温度が300℃以上である電子装置の製造方法。
以下、本実施形態に係る離型フィルム50について説明する。
図1は、本発明に係る実施形態の離型フィルム50の構造の一例を模式的に示した断面図である。
本実施形態に係る離型フィルム50は、耐熱性樹脂層(A)を備えることにより、離型フィルム50の耐熱性を向上させつつ、耐熱性樹脂層(A)、フッ素系樹脂を含む離型層(B)および離型フィルム50の厚みを相対的に薄くすることができ、その結果、離型フィルム50の熱伝導性を良好に維持することができる。
すなわち、本実施形態に係る離型フィルム50は、耐熱性樹脂層(A)と、フッ素系樹脂を含む離型層(B)とを備え、各層の厚みおよび全体の厚みが上記範囲にあることにより、電子部品同士を高温で加熱圧着する際において、電子部品への熱伝導性と電子部品からの離型性とのバランスを良好にすることが可能となる。
また、本実施形態に係る離型フィルム50全体の厚みは、好ましくは5μm超え、より好ましくは8μm超え、さらに好ましくは10μm超えである。耐熱性樹脂層(A)の厚みが上記下限値以上であることにより、離型フィルム50の耐熱性、搬送性、ハンドリング性等を向上させることができる。さらに、耐熱性樹脂層(A)の厚みが上記下限値以上であることにより、離型フィルム50の耐熱性がより一層向上し、電子部品同士を高温で加熱圧着する際において、電子部品からの離型性をより一層良好にすることができる。
ここで、3以上の電子部品を一括接合する工程としては、3以上の電子部品をプレボンディングにより積層し、次いで、ポストボンディングにより、積層した3以上の電子部品を一括接合する多段一括ボンディングプロセスが挙げられる。
ただし、本実施形態に係る離型フィルム50は、ACFやNCF等の接着剤を用いた電子部品同士の電気的な接続に限定されず、加熱圧着による電子部品の接合に広く用いることができる。
離型フィルム50は、複数の異なる電子部品がモジュール化された電子部品の接合にも用いることができる。
耐熱性樹脂層(A)は耐熱性を有する樹脂層であり、電子部品同士を加熱圧着により接合する際に、熱源により加熱される側、すなわち加熱加圧ヘッド部と接する側の層である。
耐熱性樹脂層(A)を備えることにより、離型フィルム50の機械的特性が向上し、離型フィルム50の搬送性やハンドリング性を向上させることができる。さらに、電子部品同士を加熱圧着する際の離型層(B)の軟化を抑制でき、その結果、溶融した接着剤の一部と、離型層(B)の一部とが相溶してしまうことを抑制することができる。
ここで、本実施形態において、耐熱性とは高温での寸法安定性や熱分解安定性を意味する。すなわち、耐熱性に優れるほど、高温における膨張や収縮、軟化等の変形や溶融、分解等が起き難いことを意味する。
耐熱性樹脂層(A)は一種単独で用いてもよいし、二種以上を組み合わせて用いてもよい。
耐熱性樹脂層(A)は特に限定されないが、例えば、樹脂フィルムが挙げられる。
これらの中でも、耐熱性や機械的強度、透明性、価格等のバランスに優れる観点から、ポリイミド、ポリアミド、ポリエーテルエーテルケトンおよびポリエステルから選択される一種または二種以上が好ましく、ポリイミドがより好ましい。
このような耐熱性樹脂を用いると、耐熱性樹脂層(A)の耐熱性をより一層良好にすることができる。
また、本実施形態に係る離型フィルム50において、耐熱性樹脂層(A)の330℃における貯蔵弾性率E’の上限は特に限定されないが、例えば、1.0×1010Pa以下である。これにより、電子部品表面に形成された凹凸への追従性が向上し、電子部品と離型性フィルムとの間に隙間が生じてしまうことを抑制できる。その結果、電子部品同士を加熱圧着する際の電子部品への熱伝導性をより一層向上させることができる。
耐熱性樹脂層(A)の330℃における貯蔵弾性率E’は、例えば、耐熱性樹脂層(A)を構成する樹脂の種類や樹脂組成を制御することにより上記範囲内に制御することができる。
また、耐熱性樹脂層(A)の厚みは、好ましくは5μm以上、より好ましくは8μm以上、さらに好ましくは10μm以上である。耐熱性樹脂層(A)の厚みが上記下限値以上であることにより、離型フィルム50の耐熱性、搬送性、ハンドリング性等を向上させることができる。さらに、耐熱性樹脂層(A)の厚みが上記下限値以上であることにより、離型フィルム50の耐熱性がより一層向上し、電子部品同士を高温で加熱圧着する際において、電子部品からの離型性をより一層良好にすることができる。
離型層(B)は離型性を有する層であり、電子部品同士を加熱圧着により接合する際に、電子部品と対向するように配置される層(すなわち、電子部品側に配置される層)であり、電子部品同士の加熱圧着後に電子部品から離型フィルム50を剥離するために設けられる層である。
離型層(B)は特に限定されないが、例えば、コーティング層や樹脂フィルム等が挙げられる。
ここで、本実施形態において、離型性を有するとは、例えば、水に対する接触角が80°以上である場合をいう。
本実施形態に係るフッ素系樹脂は、離型性をより一層良好にする観点から、パーフルオロアルキル基およびパーフルオロポリエーテル骨格からなる群から選択される一種または二種以上の構造を含む樹脂がより好ましい。
また、フッ素系樹脂の数平均分子量の上限は600万未満が好ましく、500万以下がより好ましく、450万以下がさらに好ましく、400万以下がさらにより好ましい。数平均分子量の上限が上記範囲にあると、フッ素系樹脂の分散液や溶液を製膜するときに均質な離型層(B)を形成できる点で好ましい。
フッ素系樹脂の数平均分子量は、Suwa et al., Journal of Applied Polymer Science, vol. 17, pp. 3253-3257 (1973) に記載の手法に基づいて、示差走査熱量分析(DSC)により測定することができる。
これらの中でも、離型性に優れる点から、PTFE(ポリテトラフルオロエチレン)、FEP(テトラフルオロエチレンとヘキサフルオロプロピレンとの共重合体)およびPFA(テトラフルオロエチレンとパーフルオロアルコキシエチレンとの共重合体)からなる群から選択される一種または二種以上のフッ素系樹脂がより好ましい。
ポリテトラフルオロエチレンとしては、例えば、ダイキン工業株式会社製「ポリフロンPTFE」、三井・ケマーズフロロプロダクツ社製「テフロン(登録商標)PTFE」等を挙げることができる。
テトラフルオロエチレンとヘキサフルオロプロピレンとの共重合体としては、例えば、ダイキン工業株式会社製「ネオフロンFEP」、または三井・ケマーズフロロプロダクツ社製「テフロン(登録商標)FEP」等を挙げることができる。
テトラフルオロエチレンとパーフルオロアルコキシエチレンとの共重合体としては、例えば、ダイキン工業株式会社製「ネオフロンPFA」、または三井・ケマーズフロロプロダクツ社製「テフロン(登録商標)PFA」等を挙げることができる。
アルコキシシリル基としては、例えば、メトキシシリル基、エトキシシリル基、イソプロポキシシリル基等が挙げられる。反応性の観点から、メトキシシリル基、エトキシシリル基が好ましい。
フッ素系コーティング層は、例えば、フッ素系樹脂を含むフッ素系コーティング剤を耐熱性樹脂層(A)に塗工して乾燥することにより形成することができる。また、フッ素系コーティング剤はフッ素系樹脂のラテックスであってもよいし、フッ素系樹脂の溶液であってもよい。
また、離型層(B)は、他の層との接着性を改良するために、表面処理を行ってもよい。具体的には、コロナ処理、プラズマ処理、アンダーコート処理、プライマーコート処理等を行ってもよい。
本実施形態に係る離型フィルム50は、離型層(B)の塗布性および離型性を向上させる観点から、離型層(B)の下層すなわち離型層(B)と耐熱性樹脂層(A)の間にプライマー層(P)を有してもよい。プライマー層(P)はシロキサン結合(-Si-O-)やシロキサン結合を有するシラン系化合物の前駆体、またはシラノール基を有していることが好ましい。
シロキサン結合やシラノール基を有するプライマー層は、例えば、ペルヒドロポリシラザン(PHPS)を、大気中または、水蒸気雰囲気下で加熱して得られるシリカ膜や、アルコキシシランのゾルゲル反応により得られるシリカ膜等が挙げられる。
本実施形態に係る離型フィルム50は、本実施形態の効果を損なわない範囲で、耐熱性樹脂層(A)と離型層(B)との間に、例えば接着層や凹凸吸収層、衝撃吸収層等をさらに有してもよい。
本実施形態に係る離型フィルム50の製造方法は特に限定されず、一般的に公知の積層フィルムの製造方法を採用することができる。例えば、本実施形態に係る離型フィルム50は、共押出成形法、ラミネート法、押出コーティング法、塗布法等の公知の製造方法を1種単独であるいは2種以上を組み合わせて用いることによって作製することができる。耐熱性樹脂層(A)および離型層(B)の種類によって、公知の積層フィルムの製造方法から適切な製造方法を選択することができる。
さらに、本実施形態に係る離型フィルム50は、例えば耐熱性樹脂層(A)上にプライマー層(P)を形成後、離型層(B)をコーティングすることにより得ることもできる。プライマー層(P)および離型層(B)の形成法は特に限定されないが、各層を形成する化合物溶液を塗布乾燥する方法が挙げられる。
本実施形態に係る離型フィルム50は、電子部品の加熱圧着による接合に用いられる。より具体的には、本実施形態に係る離型フィルム50は、第1電子部品と第2電子部品とが熱硬化型接着剤を介して接合された電子装置を製造するために好適に用いることができる。
本実施形態に係る離型フィルム50を用いた電子装置の製造方法は、例えば、熱硬化型接着剤を介して第1電子部品上に配置された第2電子部品と、加熱ヘッドとの間に、離型フィルム50を離型層(B)側が第2電子部品に向くように配置した状態で、加熱ヘッドにより第2電子部品を第1電子部品に向けて押圧することにより、第1電子部品および第2電子部品を加熱圧着により電気的に接続する工程を含む。
熱硬化型接着剤としては、例えば、公知の異方性導電接着フィルムや非導電性接着フィルム等のフィルム状接着剤を用いることができる。また、公知の異方性導電接着剤ペーストや非導電性接着剤ペーストを用いてもよい。これらの中でも、電子部品の接続は金属接続が好適に選択されることから、非導電性接着フィルムが好ましい。非導電性接着フィルムとしては、例えば、公知の非導電性接着フィルムを用いることができる。
3以上の電子部品が熱硬化型接着剤を介して接合された電子装置を製造するための製造方法は、熱硬化型接着剤を介して、3以上の電子部品が積層された積層体を準備する準備工程と、上記積層体と、加熱ヘッドとの間に、本実施形態に係る離型フィルム50を離型層(B)側が積層体に向くように配置した状態で、加熱ヘッドにより積層体を押圧することにより、隣接する電子部品同士を加熱圧着により電気的に接続する一括接合工程と、を含む。
ここで、準備工程では、プレボンディングにより、電子部品同士を仮接着してもよい。この場合、加熱ヘッドの加熱温度は、例えば、330℃未満であり、加熱ヘッドにより積層体を押圧する時間は、例えば、1秒以下である。
また、一括接合工程では、3以上の電子部品を一括で十分に接合させるために、一括接合工程における加熱ヘッドの加熱温度は、例えば300℃以上であり、330℃以上であることが好ましい。また、一括接合工程における加熱ヘッドにより積層体を押圧する時間は、例えば、5秒以上、好ましくは8秒以上である。
離型フィルムの作製に用いた材料の詳細は以下の通りである。
A1:ポリイミド製フィルム(東レ・デュポン株式会社製、製品名:カプトン50H、厚み:12.5μm、330℃における貯蔵弾性率E’: 1.8×109Pa)
A2:ポリイミド製フィルム(東レ・デュポン株式会社製、製品名:カプトン100H、厚み:25μm、330℃における貯蔵弾性率E’: 1.7×109Pa)
A3:ポリイミド製フィルム(東レ・デュポン株式会社製、製品名:カプトン80EN、製品名:厚み:20μm、330℃における貯蔵弾性率E’: 6.1×108Pa)
耐熱性樹脂層(A)の330℃における貯蔵弾性率E’は以下の方法で測定した。
固体粘弾性測定装置(RSA-3、TAインスツルメント社製)を用いて、周波数1Hz、昇温速度3℃/min、ひずみ0.05%、チャック間距離20mm、サンプル幅10mmの条件で耐熱性樹脂層(A)の固体粘弾性をそれぞれ測定し、耐熱性樹脂層(A)の330℃における貯蔵弾性率E’をそれぞれ算出した。
B1:ポリテトラフルオロエチレン(PTFE)分散液1(ダイキン社製、製品名:Polyfluon-D、PTFEの数平均分子量:340万)
B2:ポリテトラフルオロエチレンフィルム(日東電工社製、製品名:ニトフロンNo.900UL、PTFEの数平均分子量:750万)
B1およびB2におけるPTFEの数平均分子量は、Suwa et al., Journal of Applied Polymer Science, vol. 17, pp. 3253-3257 (1973) に記載の手法に基づいて、示差走査熱量分析(DSC)により測定した。
また、離型層(B)の厚みはダイヤルゲージを用いて測定し、フィルムの幅方向で両端部および中央部3点の平均値を採用した。
耐熱性樹脂層(A1)上にポリテトラフルオロエチレン(PTFE)分散液1を塗布した。その後、100℃の温度で5分乾燥させたのち、350℃で10分焼成し、厚み2.5μmの離型層(B1)を形成し、離型フィルムを得た。
離型層(B1)の厚みを5μmとした以外は、実施例1と同様の操作で離型フィルムを得た。
耐熱性樹脂層に(A3)を使用し、離型層(B1)の厚みを2.5μmとした以外は、実施例1と同様の操作で離型フィルムを得た。
市販のポリテトラフルオロエチレンフィルム(日東電工社製、製品名:ニトフロンNo.900UL、PTFEの数平均分子量:750万、厚み30μm)をそのまま用いた。
耐熱性樹脂層(A2)上にポリテトラフルオロエチレン(PTFE)分散液1を塗布した。その後、100℃の温度で5分乾燥させたのち、350℃で10分焼成し、厚み10μmの離型層(B1)を形成し、離型フィルムを得た。
耐熱性樹脂層(A3)上にポリテトラフルオロエチレン(PTFE)分散液1を塗布した。その後、100℃の温度で5分乾燥させたのち、350℃で10分焼成し、厚み5μmの離型層(B1)を形成し、離型フィルムを得た。
実施例および比較例で得られた離型フィルムについて以下の評価をおこなった。得られた結果を表1に示す。
シリコンウェハ―上にNCF(特開2018-22819号公報の実施例1に記載のアンダーフィル絶縁フィルム)を接着した。次いで、NCF上に実施例および比較例で得られた離型フィルムを積層し、得られた積層体を350℃、圧着圧力0.6MPaの条件で、30秒間プレスした。次いで、積層体を室温まで冷却してから離型フィルムをNCFから剥離した。次いで、離型フィルムの表面を観察し、NCFの付着の有無を以下の基準で評価した。なお、離型フィルムおよびNCFのサイズはそれぞれ1x5cm、1x1cmである。試験後にNCFと接触した1x1cmの部位を観察した。
◎(非常に良い):離型フィルムの表面にNCFの接触痕がわずかに観察された以外は付着物が全く観察されなかった。
○(良い):離型フィルムの表面にNCFの接触痕が観察されたが、付着物は無かった。試験後もフィルムの表面は平滑であった。
×(悪い):離型フィルムの表面に粉状0.5~2mmの付着物が観察された。試験後のフィルムの試験部位に触れると付着物が脱落した。
10mm角のシリコンウェハと、高さ3μmのバンプを有する10mm角のチップ(ウォルツ社製)の間に熱電対を挟んだチップ形状物を、50℃に熱したステージに置き、その上に離型フィルムを配置した。次に、310℃に設定した実装用ボンダーを用いて、荷重10Nで離型フィルムを介してチップ形状物を加圧し、加圧開始から15秒後のチップ形状物の温度を測定した。
B 離型層
50 離型フィルム
Claims (9)
- 電子部品の加熱圧着による接合に用いられる離型フィルムであって、
耐熱性樹脂層(A)と、
前記耐熱性樹脂層(A)の一面上に配置され、かつ、フッ素系樹脂を含む離型層(B)と、を備え、
前記耐熱性樹脂層(A)の厚みが25μm未満であり、
前記離型層(B)の厚みが5μm以下であり、
前記離型フィルムの厚みが25μm未満である離型フィルム。 - 請求項1に記載の離型フィルムにおいて、
前記耐熱性樹脂層(A)がポリイミド、ポリエーテルイミド、ポリアミドイミド、ポリアミド、液晶ポリマー、ポリエステル、ポリカーボネート、変性ポリフェニレンエーテル、ポリアセタール、ポリアリレート、ポリスルホン、ポリエーテルスルホン、ポリフェニレンスルフィド、ポリエーテルエーテルケトン、塩化ビニリデン樹脂、ポリベンゾイミダゾール、ポリベンゾオキサゾール、ポリメチルペンテン、シリコーン樹脂およびこれらの架橋物からなる群から選択される一種または二種以上を含む離型フィルム。 - 請求項1または2に記載の離型フィルムにおいて、
前記耐熱性樹脂層(A)の330℃における貯蔵弾性率E’が1.0×108Pa以上である離型フィルム。 - 請求項1乃至3のいずれか一項に記載の離型フィルムにおいて、
前記フッ素系樹脂がパーフルオロアルキル基およびパーフルオロポリエーテル骨格からなる群から選択される一種または二種以上の構造を含む離型フィルム。 - 請求項1乃至4のいずれか一項に記載の離型フィルムにおいて、
前記フッ素系樹脂がポリテトラフルオロエチレン、テトラフルオロエチレンとヘキサフルオロプロピレンとの共重合体、およびテトラフルオロエチレンとパーフルオロアルコキシエチレンとの共重合体からなる群から選択される一種または二種以上を含む離型フィルム。 - 請求項1乃至5のいずれか一項に記載の離型フィルムにおいて、
3以上の電子部品を一括接合するために用いられる離型フィルム。 - 3以上の電子部品が熱硬化型接着剤を介して接合された電子装置を製造するための製造方法であって、
前記熱硬化型接着剤を介して、3以上の前記電子部品が積層された積層体を準備する準備工程と、
前記積層体と、加熱ヘッドとの間に、請求項1乃至6のいずれか一項に記載の離型フィルムを前記離型層(B)側が前記積層体に向くように配置した状態で、前記加熱ヘッドにより前記積層体を押圧することにより、隣接する前記電子部品同士を加熱圧着により電気的に接続する一括接合工程と、
を含む電子装置の製造方法。 - 請求項7に記載の電子装置の製造方法において、
前記熱硬化型接着剤が非導電性フィルムを含む電子装置の製造方法。 - 請求項7または8に記載の電子装置の製造方法において、
前記一括接合工程における前記加熱ヘッドの加熱温度が300℃以上である電子装置の製造方法。
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