JP2017183643A - Electronic device package, manufacturing method therefor and electronic device package tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device package, a manufacturing method therefor and an electronic device package tape, capable of suppressing the peel of an adhesive layer and a metal layer by external force, and the deterioration of heat dissipation and reliability.SOLUTION: The electronic device package includes: a substrate; an electronic device which is connected to the substrate in such a manner that a first surface faces the substrate; an adhesive layer provided on a second surface of the electronic device on the opposite side to the first surface; and a metal layer adhered to the second surface of the electronic device through the adhesive layer. The electronic device package satisfies the following: the plane size of the metal layer≤the plane size of the adhesive layer<the plane size of the second surface of the electronic device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device package, an electronic device package manufacturing method, and an electronic device package tape, and more particularly, an electronic device package having a metal layer on the back surface of the electronic device, the electronic device package manufacturing method, and the electronic device. The present invention relates to a tape for an electronic device package used for a package.

  In recent years, electronic devices such as mobile phones and notebook PCs are required to be thinner and smaller. Therefore, in order to reduce the thickness and size of electronic device packages such as semiconductor packages mounted on electronic devices, the number of electrodes of electronic devices and circuit boards is increased, and the pitch is also narrowed. An example of such an electronic device package is a flip chip (FC) mounting package.

  In the flip chip mounting package, as described above, since the number of electrodes is increased or the pitch is narrowed, an increase in the amount of heat generation is a problem. Thus, as a heat dissipation structure of the flip chip mounting package, it has been proposed to provide a metal layer on the back surface of the electronic device via an adhesive layer (see, for example, Patent Document 1). And in patent document 1, the electronic device package with the same magnitude | size of the plane of an electronic device and the magnitude | size of the plane of a metal layer and an adhesive bond layer is disclosed.

  Further, in the flip chip mounting package, the linear expansion coefficient of the electronic device and the linear expansion coefficient of the circuit board may be greatly different. In this case, when the intermediate product is heated and cooled in the manufacturing process of the electronic device package, there is a difference in the amount of expansion and contraction between the electronic device and the circuit board. This difference causes warpage in the electronic device package. As a structure for suppressing such warpage, it has been proposed to provide a metal layer on the back surface of an electronic device via an adhesive layer (see, for example, Patent Document 2). Cited Document 2 discloses an electronic device package in which the size of the plane of the adhesive layer is larger than the size of the plane of the electronic device.

  Furthermore, in flip chip mounting packages, it has also been proposed to provide a metal layer on the back surface of an electronic device via an adhesive layer and use this metal layer as a protective layer for laser marking (see, for example, Patent Document 3). . Patent Document 3 discloses an electronic device package in which the plane size of the electronic device is the same as the plane size of the metal layer and the adhesive layer.

Japanese Patent Laid-Open No. 2007-233502 Japanese Patent No. 5487847 Japanese Patent No. 5419226

  However, if the size of the plane of the adhesive layer is larger than the size of the plane of the electronic device as in Cited Document 2, when an external force is applied to a portion where the adhesive layer protrudes from the outer edge of the electronic device, The agent layer is peeled off and heat dissipation and reliability are lowered. For example, when the electronic device package is sealed, the adhesive layer is formed from the outer edge portion of the electronic device by the pressure of the sealing resin that has entered the lower surface side of the portion protruding from the outer edge of the electronic device. There existed a problem that it peeled and heat dissipation and reliability fell.

  When the size of the plane of the electronic device and the size of the plane of the metal layer and the adhesive layer are the same as in Patent Documents 1 and 3, when the metal layer is bonded to the electronic device via the adhesive layer Due to the positioning error, a portion where the adhesive layer protrudes from the outer edge of the electronic device is generated. Then, as in the case described above, there is a problem that the adhesive layer is peeled off by an external force and heat dissipation and reliability are lowered.

  Therefore, the present invention relates to an electronic device package, a method for manufacturing an electronic device package, and an electronic device package tape that can prevent the adhesive layer and the metal layer from being peeled off by an external force, thereby reducing heat dissipation and reliability. The purpose is to provide.

  In order to solve the above problems, an electronic device package according to the present invention includes a substrate, an electronic device connected to the substrate such that the first surface faces the substrate, and an opposite side of the first surface. An adhesive layer provided on the second surface of the electronic device, and a metal layer bonded to the second surface of the electronic device via the adhesive layer, the plane size of the metal layer ≦ Plane size of the adhesive layer <Plane size of the second surface of the electronic device.

  In the electronic device package, the metal layer preferably contains copper or aluminum.

  In addition, in order to solve the above problems, the method for manufacturing an electronic device package according to the present invention includes a step of connecting an electronic device to the substrate such that the first surface faces the substrate, and the first surface Bonding a metal layer to the second surface of the electronic device on the opposite side via an adhesive layer, wherein the plane size of the metal layer ≦ the plane size of the adhesive layer <the electron It is the size of the plane of the second surface of the device.

  In the electronic device package manufacturing method, the metal layer preferably contains copper or aluminum.

  Moreover, in order to solve the above-mentioned subject, the said tape for electronic device packages is laminated | stacked and provided in the opposite side to the said base film of the said adhesive layer and the adhesive tape which has a base film and an adhesive layer. A laminate of an adhesive layer and a metal layer, wherein the metal layer is opposite to the first surface of an electronic device connected to the substrate such that the first surface faces the substrate. An electronic device package tape bonded to the second surface via the adhesive layer, wherein the planar size of the metal layer ≦ the planar size of the adhesive layer <the second surface of the electronic device The adhesive layer and the metal layer are cut in advance and separated into pieces so as to be the size of the plane.

  In the electronic device package tape, the metal layer preferably contains copper or aluminum.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that an adhesive bond layer and a metal layer peel by external force, and heat dissipation and reliability fall.

It is sectional drawing which shows typically the structure of the electronic device package which concerns on embodiment of this invention. It is sectional drawing which shows typically the structure of the tape for electronic device packages which concerns on embodiment of this invention. (A) is a top view which shows typically the structure of the tape for electronic device packages which concerns on embodiment of this invention, (b) is the same sectional drawing. It is a perspective view which shows typically the structure of the tape for electronic device packages which concerns on embodiment of this invention. It is explanatory drawing which shows typically the manufacturing method of the tape for electronic device packages which concerns on embodiment of this invention, (A) is a longitudinal cross-sectional view which shows the bonding process of a metal layer, (B) is an adhesive agent It is longitudinal direction sectional drawing which shows the bonding process of a layer, (C) is a transversal direction sectional view which shows a precut process, (D) is a perspective view which shows the removal process of an unnecessary part. It is explanatory drawing which shows typically the manufacturing method of the tape for electronic device packages which concerns on embodiment of this invention, (A) is a transversal direction sectional drawing which shows the bonding process of an adhesive tape, (B) is a pre-cut. It is a transversal direction sectional view showing a process, and (C) is a transversal direction sectional view showing an unnecessary part removal process. It is sectional drawing which illustrates typically the manufacturing method of the electronic device package which concerns on embodiment of this invention. It is sectional drawing which illustrates typically the manufacturing method of the electronic device package which concerns on embodiment of this invention. It is sectional drawing which shows typically the structure of the electronic device package which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view schematically showing the structure of an electronic device package 8 according to an embodiment of the present invention. In the present embodiment, the electronic device package 8 will be described by taking a semiconductor chip C flip-chip connected to an adherend as an example.

  The electronic device package 8 has a substrate 9 on which the semiconductor chip C is flip-chip bonded so that the first surface C1 (circuit surface on which a circuit is formed) faces the substrate 9. The connection is made by electrically connecting the bump 10 of the semiconductor chip C and the bonding conductive material 11 (solder or the like) deposited on the connection pad by (flip chip mounting method).

  An adhesive layer 4 is provided on the second surface (back surface) opposite to the first surface C 1 of the semiconductor chip C, and the metal layer 3 is bonded via the adhesive layer 4. The plane sizes of the second surface C2, the adhesive layer 4, and the metal layer 3 of the semiconductor chip C are such that the metal layer 3 = the adhesive layer 4 <the second surface C2 of the semiconductor chip C.

  By setting the size of the plane of the adhesive layer 4 to the size of the plane of the second surface C2 of the semiconductor chip C, there is no portion where the adhesive layer 4 protrudes from the outer edge of the semiconductor chip C in the plane direction. Yes. Therefore, it can be suppressed that an external force is applied to the adhesive layer 4 and the adhesive layer 4 is peeled off from the outer edge portion of the semiconductor chip C. Further, since the size of the plane of the metal layer 3 is equal to the size of the plane of the adhesive layer 4, there is no portion where the metal layer 3 protrudes from the outer edge of the adhesive layer 4 in the plane direction. Therefore, it is possible to prevent the metal layer 3 from being peeled off from the outer edge portion of the adhesive layer 4 due to an external force applied to the metal layer 3.

  The planar shape of the adhesive layer 4 is preferably substantially similar to the planar shape of the semiconductor chip C, but may not be similar. When the shape is not similar, the length of the side constituting the planar shape of the adhesive layer 4 is equal to or less than the length of the side constituting the planar shape of the corresponding semiconductor chip C in the direction of being bonded to the semiconductor chip C. If the area of the plane of the adhesive layer 4 is smaller than the area of the plane of the semiconductor chip C, the length of the side constituting the planar shape of the adhesive layer 4 and the direction of the semiconductor chip C corresponding to the direction of bonding to the semiconductor chip C Although there may be sides having the same length constituting the planar shape, since high accuracy is required for alignment when mounting the adhesive layer 4 on the semiconductor chip C, from the viewpoint of mountability, bonding It is preferable that the length of the side constituting the planar shape of the agent layer 4 is smaller than the length of the side constituting the planar shape of the corresponding semiconductor chip C in the direction of being bonded to the semiconductor chip C. The plane area of the adhesive layer 4 is preferably 80% or more and less than 100%, more preferably 90% or more and 96% or less, of the plane area of the semiconductor chip C. If the area of the plane of the adhesive layer 4 is 80% or more of the area of the plane of the semiconductor chip C, an effect of suppressing heat dissipation and warping of the electronic device package can be obtained. In consideration of the accuracy of mounting on the semiconductor chip C and manufacturing variations, in order to allow the adhesive layer 4 and the metal layer 3 to be mounted without protruding from the semiconductor chip C, the adhesive layer 4 The area of the plane is preferably 96% or less of the area of the plane of the semiconductor chip C.

  In the present embodiment, the plane size of the metal layer 3 is equal to the plane size of the adhesive layer 4. However, as shown in FIG. 9, the plane size of the metal layer 3 <the size of the adhesive layer 4. It may be the size of a plane. In this case, the planar shape of the metal layer 3 is preferably substantially similar to the planar shape of the adhesive layer 4, but may not be similar. When the shape is not similar, the length of the side constituting the planar shape of the metal layer 3 is equal to or less than the length of the side constituting the planar shape of the corresponding adhesive layer 4 in the direction to be bonded to the adhesive layer 4. . The plane area of the metal layer 3 is preferably 80% or more and less than 100%, more preferably 90% or more and 95% or less, of the plane area of the semiconductor chip C. If the area of the plane of the metal layer 3 is 80% or more of the area of the plane of the semiconductor chip C, the effect of suppressing heat dissipation and warping of the electronic device package can be obtained.

  As the adherend, various substrates 9 such as a lead frame and a circuit substrate (such as a wiring circuit substrate) can be used. The material of the substrate 9 is not particularly limited, and examples thereof include a ceramic substrate and a plastic substrate. Examples of the plastic substrate include an epoxy substrate, a bismaleimide triazine substrate, and a polyimide substrate. Also, a chip-on-chip structure can be obtained by using another semiconductor chip as an adherend and flip-chip connecting the semiconductor chip C.

  FIG. 2 is a cross-sectional view showing the electronic device package tape 1 according to the embodiment of the present invention. The electronic device package tape 1 can be used to manufacture the electronic device package 8 described above. The electronic device package tape 1 has a pressure-sensitive adhesive tape 5 including a base film 51 and a pressure-sensitive adhesive layer 52 provided on the base film 51, and the adhesive layer 4 is formed on the pressure-sensitive adhesive layer 52. And a laminated body of the metal layer 3 is provided. In the present embodiment, the adhesive layer 4 and the metal layer 3 provided by being laminated on the adhesive layer 4 are provided on the pressure-sensitive adhesive layer 52. The laminated body of the adhesive layer 4 and the metal layer 3 includes a mode in which they are indirectly laminated through a primer layer or the like for improving the adhesion between them.

  As shown in FIGS. 3 and 4, the electronic device package tape 1 of the present invention has an adhesive tape 5 cut into a shape corresponding to the ring frame R (see FIG. 8), and a metal layer 3 and an adhesive layer. Corresponding to this, 4 is preferably cut into a predetermined shape (pre-cut processing), and pre-cut processing is performed in this embodiment.

  As shown in FIGS. 3 and 4, the electronic device package tape 1 of the present invention has an adhesive tape 5 (label part 5 a) cut into a shape corresponding to the metal layer 3, the adhesive layer 4, and the ring frame R. The long base tape 2 in which a plurality of laminated bodies are formed is preferably wound into a roll shape, and in the present embodiment, the base tape 2 is wound into a roll shape. The laminated body provided in the tape 2 may be cut one by one.

  When pre-cut and wound into a roll, the electronic device package tape 1 has a base tape 2 as shown in FIGS. 3 and 4, and the base tape 2 has a predetermined tape. A metal layer 3 having a planar shape, an adhesive layer 4 having a predetermined planar shape provided on the opposite side of the metal tape 3 to the base tape 2 side, and having a predetermined planar shape; And a label portion 5a having a predetermined planar shape provided so as to come into contact with the base tape 2 around the adhesive layer 4 and a peripheral portion 5b surrounding the outside of the label portion 5a Tape 5 is provided.

  The label portion 5a has a shape corresponding to the ring frame R for dicing. The shape corresponding to the shape of the ring frame R for dicing is preferably similar in shape to the inside of the ring frame R and larger than the size inside the ring frame R. Moreover, although it does not necessarily need to be circular, the shape close | similar to circle is preferable and it is more preferable that it is circular. The peripheral part 5b includes a form that completely surrounds the outside of the label part 5a and a form that is not completely enclosed as shown. Note that the peripheral portion 5b may not be provided.

  Further, the metal layer 3 and the adhesive layer 4 are the size of the plane of the metal layer 3 = the size of the plane of the adhesive layer 4 <the bonding of the metal layer 3 and the adhesive layer 4 of the electronic device scheduled to be bonded. It is cut and separated into pieces so as to be the size of the plane of the second surface. In the present embodiment, the size of the plane of the metal layer 3 = the size of the plane of the adhesive layer 4, but the size of the plane of the metal layer 3 <the size of the plane of the adhesive layer 4 may be used. The size of the plane of the metal layer 3, the size of the plane of the adhesive layer 4, and the size of the plane of the second surface of the electronic device are as described in the embodiment related to the electronic device package.

  The adhesive layer 4 has a predetermined label shape as a whole in which the pieces are gathered, and the outer edge of the label shape is bonded to the peripheral portion of the label portion 5a of the adhesive tape 5 with the ring frame R, The shape is smaller than the label portion 5a so that it can be pushed up by the push-up member of the pickup device (see FIG. 8). The label shape of the adhesive layer 4 is preferably similar to the label portion 5a and smaller than the size of the label portion 5a. The label shape of the adhesive layer 4 does not necessarily have to be a circle, but a shape close to a circle is preferable, and a circle is more preferable.

  The metal layer 3 has the same overall shape as the adhesive layer 4 in which the individual pieces are gathered, and the adhesive layer 4 is laminated on the metal layer 3. In this case, it is sufficient that the main portions are laminated, and the metal layer 3 and the adhesive layer 4 do not necessarily have the same size, but they may have substantially the same shape for convenience of manufacturing. preferable. Each component will be described below.

<Base tape 2>
Although the base tape 2 can also be comprised with a well-known separator, the base tape used for the pre-cut process of the tape for electronic device packages can also be used as it is. When the base tape used for the pre-cut processing of the tape for electronic device package is used as it is, the base tape 2 needs to hold the metal layer 3 at the time of the pre-cut processing, so for example, on one side of the resin film and the resin film. The tape which has the provided adhesive layer for base tapes can be used conveniently.

  As the material of the resin film constituting the base tape 2, known materials can be used. For example, polyester (PET, PBT, PEN, PBN, PTT), polyolefin (PP, PE) Examples thereof include films obtained by partially replacing these materials, copolymers (EVA, EEA, EBA), and further improving adhesion and mechanical strength. Moreover, the laminated body of these films may be sufficient. From the viewpoint of heat resistance, smoothness, and availability, it is preferably selected from polyethylene terephthalate, polypropylene, and high-density polyethylene.

  The thickness of the resin film constituting the base tape 2 is not particularly limited and may be appropriately set, but is preferably 10 to 150 μm.

  As the resin used for the adhesive layer for the base tape, known chlorinated polypropylene resins, acrylic resins, polyester resins, polyurethane resins, epoxy resins, etc. used for adhesives can be used. An acrylic adhesive having a polymer as a base polymer is preferred.

  Examples of the acrylic polymer include (meth) acrylic acid alkyl esters (for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, s-butyl ester, t-butyl ester, pentyl ester, isopropyl ester). Pentyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethylhexyl ester, isooctyl ester, nonyl ester, decyl ester, isodecyl ester, undecyl ester, dodecyl ester, tridecyl ester, tetradecyl ester, hexadecyl ester, (E.g., linear or branched alkyl ester having 1 to 30 carbon atoms, particularly 4 to 18 carbon atoms) of an alkyl group such as octadecyl ester and eicosyl ester) ) Acrylic acid cycloalkyl esters (e.g., cyclopentyl ester, acrylic polymer or the like using one or more of the monomer component cyclohexyl ester etc.). In addition, (meth) acrylic acid ester means acrylic acid ester and / or methacrylic acid ester, and (meth) of the present invention has the same meaning.

  The acrylic polymer contains units corresponding to other monomer components copolymerizable with the (meth) acrylic acid alkyl ester or cycloalkyl ester, if necessary, for the purpose of modifying cohesive force, heat resistance and the like. May be. Examples of such monomer components include, for example, carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; maleic anhydride Acid anhydride monomers such as itaconic anhydride; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate Hydroxyl group-containing monomers such as 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl (meth) acrylate; Styrene Contains sulfonic acid groups such as phonic acid, allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, (meth) acrylamidepropanesulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalenesulfonic acid Monomers; Phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; acrylamide, acrylonitrile and the like. One or more of these copolymerizable monomer components can be used. The amount of these copolymerizable monomers used is preferably 40% by weight or less based on the total monomer components.

  Furthermore, since the acrylic polymer is crosslinked, a polyfunctional monomer or the like can be included as a monomer component for copolymerization as necessary. Examples of such polyfunctional monomers include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, urethane (meth) An acrylate etc. are mentioned. These polyfunctional monomers can also be used alone or in combination of two or more. The amount of the polyfunctional monomer used is preferably 30% by weight or less of the total monomer components from the viewpoint of adhesive properties and the like.

  The acrylic polymer can be prepared, for example, by applying an appropriate method such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, or a suspension polymerization method to a mixture of one or more component monomers. The adhesive layer for the base tape preferably has a composition that suppresses the inclusion of a low molecular weight substance from the standpoint of preventing contamination of the wafer. From this point, an acrylic polymer having a weight average molecular weight of 300,000 or more, particularly 400,000 to 3,000,000. Since the main component is preferable, the pressure-sensitive adhesive can be of an appropriate crosslinking type by an internal crosslinking method, an external crosslinking method, or the like.

  Moreover, in order to control the crosslinking density of the pressure-sensitive adhesive layer for the base tape and improve the peelability from the pressure-sensitive adhesive tape 5, for example, a polyfunctional isocyanate compound, a polyfunctional epoxy compound, a melamine compound, a metal salt compound, Energy beam by mixing a metal chelate compound, an amino resin compound, a method of crosslinking using an appropriate external crosslinking agent such as peroxide, or a low molecular compound having two or more carbon-carbon double bonds Appropriate methods such as a method of crosslinking by irradiation or the like can be employed. When using an external cross-linking agent, the amount used is appropriately determined depending on the balance with the base polymer to be cross-linked and further depending on the intended use as an adhesive. Generally, it is preferable to add about 20 parts by weight or less, and further 0.1 to 20 parts by weight with respect to 100 parts by weight of the base polymer.

  The thickness of the pressure-sensitive adhesive layer for the base tape is not particularly limited and can be appropriately determined, but is generally about 5 to 200 μm. Moreover, the adhesive layer for base tapes may be composed of a single layer or a plurality of layers.

<Adhesive tape 5>
There is no restriction | limiting in particular as the adhesive tape 5, A conventional adhesive tape can be used. As the adhesive tape 5, for example, a substrate film 51 provided with an adhesive layer 52 can be suitably used.

  The substrate film 51 can be used without particular limitation as long as it is a conventionally known one, but has radiation transparency when a radiation curable material is used as the adhesive layer 52 described later. It is preferable to use one.

  For example, as the material, polyethylene, polypropylene, ethylene-propylene copolymer, polybutene-1, poly-4-methylpentene-1, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic Α-olefin homopolymer or copolymer such as acid methyl copolymer, ethylene-acrylic acid copolymer, ionomer or a mixture thereof, polyurethane, styrene-ethylene-butene or pentene copolymer, polyamide-polyol Listed are thermoplastic elastomers such as copolymers, and mixtures thereof. Further, the base film may be a mixture of two or more materials selected from these groups, or may be a single layer or a multilayer.

  The thickness of the base film 51 is not particularly limited and may be appropriately set, but is preferably 50 to 200 μm.

  In order to improve the adhesion between the base film 51 and the pressure-sensitive adhesive layer 52, the surface of the base film 51 is subjected to chemical or physical treatment such as chromic acid treatment, ozone exposure, flame exposure, high-voltage impact exposure, or ionizing radiation treatment. Surface treatment may be applied.

  In the present embodiment, the pressure-sensitive adhesive layer 52 is provided directly on the base film 51. However, a primer layer for increasing adhesion, an anchor layer for improving machinability during dicing, stress You may provide indirectly through a relaxation layer, an antistatic layer, etc.

  The resin used for the pressure-sensitive adhesive layer 52 of the pressure-sensitive adhesive tape 5 is not particularly limited, and known chlorinated polypropylene resins, acrylic resins, polyester resins, polyurethane resins, epoxy resins and the like used for pressure-sensitive adhesives can be used. Although it can be used, an acrylic adhesive having an acrylic polymer as a base polymer is preferred.

  Examples of the acrylic polymer include (meth) acrylic acid alkyl esters (for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, s-butyl ester, t-butyl ester, pentyl ester, isopropyl ester). Pentyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethylhexyl ester, isooctyl ester, nonyl ester, decyl ester, isodecyl ester, undecyl ester, dodecyl ester, tridecyl ester, tetradecyl ester, hexadecyl ester, (E.g., linear or branched alkyl ester having 1 to 30 carbon atoms, particularly 4 to 18 carbon atoms) of an alkyl group such as octadecyl ester and eicosyl ester) ) Acrylic acid cycloalkyl esters (e.g., cyclopentyl ester, acrylic polymer or the like using one or more of the monomer component cyclohexyl ester etc.). In addition, (meth) acrylic acid ester means acrylic acid ester and / or methacrylic acid ester, and (meth) of the present invention has the same meaning.

  The acrylic polymer contains units corresponding to other monomer components copolymerizable with the (meth) acrylic acid alkyl ester or cycloalkyl ester, if necessary, for the purpose of modifying cohesive force, heat resistance and the like. May be. Examples of such monomer components include, for example, carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; maleic anhydride Acid anhydride monomers such as itaconic anhydride; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate Hydroxyl group-containing monomers such as 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl (meth) acrylate; Styrene Contains sulfonic acid groups such as phonic acid, allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, (meth) acrylamidepropanesulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalenesulfonic acid Monomers; Phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; acrylamide, acrylonitrile and the like. One or more of these copolymerizable monomer components can be used. The amount of these copolymerizable monomers used is preferably 40% by weight or less based on the total monomer components.

  Furthermore, since the acrylic polymer is crosslinked, a polyfunctional monomer or the like can be included as a monomer component for copolymerization as necessary. Examples of such polyfunctional monomers include hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, urethane (meth) An acrylate etc. are mentioned. These polyfunctional monomers can also be used alone or in combination of two or more. The amount of the polyfunctional monomer used is preferably 30% by weight or less of the total monomer components from the viewpoint of adhesive properties and the like.

  The acrylic polymer can be prepared, for example, by applying an appropriate method such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, or a suspension polymerization method to a mixture of one or more component monomers. The pressure-sensitive adhesive layer 52 preferably has a composition that suppresses the inclusion of a low molecular weight substance. From this point of view, the pressure-sensitive adhesive layer 52 is preferably composed mainly of an acrylic polymer having a weight average molecular weight of 300,000 or more, particularly 400,000 to 3,000,000. The agent may be of an appropriate crosslinking type by an internal crosslinking method, an external crosslinking method or the like.

  Moreover, in order to control the crosslinking density of the pressure-sensitive adhesive layer 52 to improve pickup properties, for example, a polyfunctional isocyanate compound, a polyfunctional epoxy compound, a melamine compound, a metal salt compound, a metal chelate compound, an amino resin system A method of crosslinking using an appropriate external crosslinking agent such as a compound or peroxide, or a method of mixing a low molecular compound having two or more carbon-carbon double bonds and crosslinking by irradiation with energy rays, etc. A suitable method such as the above can be adopted. When using an external cross-linking agent, the amount used is appropriately determined depending on the balance with the base polymer to be cross-linked and further depending on the intended use as an adhesive. Generally, it is preferable to add about 20 parts by weight or less, and further 0.1 to 20 parts by weight with respect to 100 parts by weight of the base polymer. In addition, from the viewpoint of preventing deterioration and the like, additives such as various tackifiers and anti-aging agents may be used for the pressure-sensitive adhesive in addition to the above components.

  As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 52, a radiation curable pressure-sensitive adhesive is suitable. Examples of the radiation-curable pressure-sensitive adhesive include additive-type radiation-curable pressure-sensitive adhesives in which a radiation-curable monomer component or a radiation-curable oligomer component is blended with the above-mentioned pressure-sensitive adhesive.

  Examples of the radiation curable monomer component to be blended include urethane (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra ( Examples thereof include (meth) acrylate, dipentaerythritol monohydroxypenta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and 1,4-butanediol di (meth) acrylate. These monomer components can be used alone or in combination of two or more.

  Examples of the radiation curable oligomer component include various oligomers such as urethane, polyether, polyester, polycarbonate, and polybutadiene, and those having a molecular weight in the range of about 100 to 30,000 are suitable. The amount of the radiation curable monomer component or oligomer component can be appropriately determined in accordance with the type of the pressure-sensitive adhesive layer 52, and the amount by which the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer 52 can be reduced. Generally, it is, for example, about 5 to 500 parts by weight, preferably about 70 to 150 parts by weight with respect to 100 parts by weight of a base polymer such as an acrylic polymer constituting the pressure-sensitive adhesive.

  As the radiation curable pressure-sensitive adhesive, in addition to the additive-type radiation curable pressure-sensitive adhesive, a base polymer having a carbon-carbon double bond in the polymer side chain or main chain or at the main chain terminal was used. An internal radiation-curable pressure-sensitive adhesive is also included. Intrinsic radiation curable adhesives do not need to contain oligomer components, which are low molecular components, or do not contain much, so they are stable without the oligomer components moving through the adhesive over time. This is preferable because the pressure-sensitive adhesive layer 52 having a layered structure can be formed.

  As the base polymer having a carbon-carbon double bond, those having a carbon-carbon double bond and having adhesiveness can be used without particular limitation. As such a base polymer, those having an acrylic polymer as a basic skeleton are preferable. Examples of the basic skeleton of the acrylic polymer include the acrylic polymers exemplified above.

  The method for introducing the carbon-carbon double bond into the acrylic polymer is not particularly limited, and various methods can be adopted. However, it is easy in terms of molecular design to introduce the carbon-carbon double bond into the polymer side chain. is there. For example, after a monomer having a functional group is previously copolymerized with an acrylic polymer, a compound having a functional group capable of reacting with the functional group and a carbon-carbon double bond is converted into a radiation curable carbon-carbon double bond. A method of performing condensation or addition reaction while maintaining the above.

  Examples of combinations of these functional groups include carboxylic acid groups and epoxy groups, carboxylic acid groups and aziridyl groups, hydroxyl groups and isocyanate groups, and the like. Among these combinations of functional groups, a combination of a hydroxyl group and an isocyanate group is preferable because of easy tracking of the reaction. Moreover, the functional group may be on either side of the acrylic polymer and the compound as long as the acrylic polymer having the carbon-carbon double bond is generated by a combination of these functional groups. In the preferable combination, it is preferable that the acrylic polymer has a hydroxyl group and the compound has an isocyanate group. In this case, examples of the isocyanate compound having a carbon-carbon double bond include methacryloyl isocyanate, 2-methacryloyloxyethyl isocyanate, m-isopropenyl-α, α-dimethylbenzyl isocyanate, and the like. Further, as the acrylic polymer, those obtained by copolymerizing the above-exemplified hydroxy group-containing monomers, ether compounds of 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, or the like are used.

  The internal radiation curable pressure-sensitive adhesive can use the base polymer (particularly acrylic polymer) having the carbon-carbon double bond alone, but the radiation curable monomer component does not deteriorate the characteristics. And photopolymerizable compounds such as oligomer components can also be blended. The compounding amount of the photopolymerizable compound is usually in the range of 30 parts by weight or less, preferably in the range of 0 to 10 parts by weight, with respect to 100 parts by weight of the base polymer.

  The radiation curable pressure-sensitive adhesive preferably contains a photopolymerization initiator when cured by ultraviolet rays or the like.

Among the acrylic polymers described above also, in particular CH 2 ₌ CHCOOR (wherein, R a carbon number of alkyl groups of 4 to 18.) Acrylic acid ester represented by the hydroxyl group-containing monomer, in the molecule Acrylic polymer A comprising an isocyanate compound having a radical reactive carbon-carbon double bond is preferred.

  When the number of carbon atoms in the alkyl group of the acrylic acid alkyl ester is less than 4, the polarity is high and the peeling force becomes too large, so that the pickup property may be lowered. On the other hand, when the number of carbon atoms in the alkyl group of the acrylic acid alkyl ester exceeds 18, the glass transition temperature of the pressure-sensitive adhesive layer 52 becomes too high, and the adhesive properties at room temperature are deteriorated. 3 peeling may occur.

  The acrylic polymer A may contain units corresponding to other monomer components as necessary.

  In the acrylic polymer A, an isocyanate compound having a radical reactive carbon-carbon double bond is used. That is, it is preferable that the acrylic polymer has a configuration in which a double bond-containing isocyanate compound is subjected to an addition reaction with a polymer based on a monomer composition such as an acrylic ester or a hydroxyl group-containing monomer. Therefore, the acrylic polymer preferably has a radical reactive carbon-carbon double bond in its molecular structure. Thereby, it can be set as the active energy ray hardening-type adhesive layer (ultraviolet ray hardening-type adhesive layer etc.) hardened | cured by irradiation of an active energy ray (ultraviolet rays etc.), and the peeling force of the metal layer 3 and the adhesive layer 52 Can be reduced.

  Examples of the double bond-containing isocyanate compound include methacryloyl isocyanate, acryloyl isocyanate, 2-methacryloyloxyethyl isocyanate, 2-acryloyloxyethyl isocyanate, m-isopropenyl-α, α-dimethylbenzyl isocyanate, and the like. A double bond containing isocyanate compound can be used individually or in combination of 2 or more types.

  Moreover, in order to adjust the adhesive force before active energy ray irradiation and the adhesive force after active energy ray irradiation to an active energy ray hardening-type adhesive, an external crosslinking agent can also be used suitably. Specific examples of the external crosslinking method include a method of adding a so-called crosslinking agent such as a polyisocyanate compound, an epoxy compound, an aziridine compound, a melamine crosslinking agent, and reacting them. When using an external cross-linking agent, the amount used is appropriately determined depending on the balance with the base polymer to be cross-linked and further depending on the intended use as an adhesive. The amount of the external crosslinking agent used is generally 20 parts by weight or less (preferably 0.1 to 10 parts by weight) with respect to 100 parts by weight of the base polymer. Further, the active energy ray-curable pressure-sensitive adhesive may contain various conventionally known additives such as tackifiers, anti-aging agents, and foaming agents in addition to the above components, if necessary.

  The thickness of the pressure-sensitive adhesive layer 52 is not particularly limited and can be appropriately determined, but is generally about 5 to 200 μm. The pressure-sensitive adhesive layer 52 may be composed of a single layer or a plurality of layers.

<Metal layer 3>
The metal constituting the metal layer 3 is not particularly limited. For example, the metal layer 3 is at least one selected from the group consisting of stainless steel, aluminum, iron, titanium, tin, nickel, and copper. 8 is preferable from the viewpoint of preventing warpage. Among these, it is particularly preferable to contain copper from the viewpoint of high thermal conductivity and obtaining a heat dissipation effect. In addition, from the viewpoint of preventing warpage of the electronic device package 8, it is particularly preferable to include aluminum.

  The thickness of the metal layer 3 is 5 μm or more and less than 200 μm. By setting the thickness to 5 μm or more, it is possible to obtain a heat dissipation effect and a package warpage suppressing effect. Moreover, if it is less than 200 micrometers, winding will be easy.

<Adhesive layer 4>
The adhesive layer 4 is a film obtained by previously forming an adhesive.

  The adhesive layer 4 is formed of at least a thermosetting resin, and is preferably formed of at least a thermosetting resin and a thermoplastic resin.

  Examples of the thermoplastic resin include natural rubber, butyl rubber, isoprene rubber, chloroprene rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, polybutadiene resin, polycarbonate resin, Thermoplastic polyimide resin, polyamide resin such as 6-nylon and 6,6-nylon, phenoxy resin, acrylic resin, saturated polyester resin such as PET (polyethylene terephthalate) and PBT (polybutylene terephthalate), polyamideimide resin, or fluorine resin Etc. A thermoplastic resin can be used individually or in combination of 2 or more types. Among these thermoplastic resins, acrylic resins are less ionic impurities and have excellent stress relaxation properties, phenoxy resins are both high flexibility and strength and high toughness. This is particularly preferable because reliability can be easily secured.

  The acrylic resin is not particularly limited, and one or more of esters of acrylic acid or methacrylic acid having a linear or branched alkyl group having 30 or less carbon atoms (preferably 1 to 18 carbon atoms). And the like. That is, in the present invention, acrylic resin has a broad meaning including methacrylic resin. Examples of the alkyl group include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, t-butyl group, isobutyl group, pentyl group, isopentyl group, hexyl group, heptyl group, and 2-ethylhexyl group. Octyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, undecyl group, dodecyl group (lauryl group), tridecyl group, tetradecyl group, stearyl group, octadecyl group and the like.

  In addition, the other monomer for forming the acrylic resin (a monomer other than an alkyl ester of acrylic acid or methacrylic acid having an alkyl group with 30 or less carbon atoms) is not particularly limited. For example, acrylic acid, Carboxyl group-containing monomers such as methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid or crotonic acid, acid anhydride monomers such as maleic anhydride or itaconic anhydride, (meth) 2-hydroxyethyl acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, (meth) 10-hydroxydecyl acrylate Hydroxyl group-containing monomers such as (meth) acrylic acid 12-hydroxylauryl or (4-hydroxymethylcyclohexyl) -methyl acrylate, styrenesulfonic acid, allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid Sulfonic acid group-containing monomers such as (meth) acrylamide propane sulfonic acid, sulfopropyl (meth) acrylate or (meth) acryloyloxynaphthalene sulfonic acid, or phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate Is mentioned. In addition, (meth) acrylic acid means acrylic acid and / or methacrylic acid, and (meth) of the present invention has the same meaning.

  Examples of the thermosetting resin include an epoxy resin, a phenol resin, an amino resin, an unsaturated polyester resin, a polyurethane resin, a silicone resin, and a thermosetting polyimide resin. A thermosetting resin can be used individually or in combination of 2 or more types. As the thermosetting resin, an epoxy resin containing a small amount of ionic impurities that corrode semiconductor elements is particularly suitable. Moreover, a phenol resin can be used suitably as a hardening | curing agent of an epoxy resin.

  The epoxy resin is not particularly limited. For example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, brominated bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol AF type epoxy. Bifunctional epoxy such as resin, biphenyl type epoxy resin, naphthalene type epoxy resin, fluorene type epoxy resin, phenol novolac type epoxy resin, orthocresol novolak type epoxy resin, trishydroxyphenylmethane type epoxy resin, tetraphenylolethane type epoxy resin Epoxy resin such as resin, polyfunctional epoxy resin, hydantoin type epoxy resin, trisglycidyl isocyanurate type epoxy resin or glycidylamine type epoxy resin It can be used.

  As examples of the epoxy resin, novolak type epoxy resins, biphenyl type epoxy resins, trishydroxyphenylmethane type epoxy resins, and tetraphenylolethane type epoxy resins are particularly preferable. This is because these epoxy resins are rich in reactivity with a phenol resin as a curing agent and are excellent in heat resistance and the like.

  Furthermore, the phenol resin acts as a curing agent for the epoxy resin. For example, a novolak type phenol resin such as a phenol novolak resin, a phenol aralkyl resin, a cresol novolak resin, a tert-butylphenol novolak resin, a nonylphenol novolak resin, or a resol type. Examples thereof include phenol resins and polyoxystyrene such as polyparaoxystyrene. A phenol resin can be used individually or in combination of 2 or more types. Of these phenol resins, phenol novolac resins and phenol aralkyl resins are particularly preferred. This is because the connection reliability of the semiconductor device can be improved.

  The mixing ratio of the epoxy resin and the phenol resin is preferably such that, for example, the hydroxyl group in the phenol resin is 0.5 equivalent to 2.0 equivalents per equivalent of epoxy group in the epoxy resin component. More preferred is 0.8 equivalent to 1.2 equivalent. That is, if the blending ratio of both is out of the above range, sufficient curing reaction does not proceed and the properties of the cured epoxy resin are likely to deteriorate.

  Moreover, the thermosetting acceleration | stimulation catalyst of an epoxy resin and a phenol resin may be used. The thermosetting acceleration catalyst is not particularly limited, and can be appropriately selected from known thermosetting acceleration catalysts. A thermosetting acceleration | stimulation catalyst can be used individually or in combination of 2 or more types. As the thermosetting acceleration catalyst, for example, an amine curing accelerator, a phosphorus curing accelerator, an imidazole curing accelerator, a boron curing accelerator, a phosphorus-boron curing accelerator, or the like can be used.

  As the curing agent for the epoxy resin, it is preferable to use a phenol resin as described above, but known curing agents such as imidazoles, amines, and acid anhydrides can also be used.

  It is important that the adhesive layer 4 has adhesiveness (adhesion) to the adherend 9 such as an electronic device. Therefore, in order to crosslink the adhesive layer 4 to some extent in advance, a polyfunctional compound that reacts with the functional group at the end of the molecular chain of the polymer may be added as a crosslinking agent. Thereby, the adhesive property under high temperature can be improved and heat resistance can be improved.

  The crosslinking agent is not particularly limited, and a known crosslinking agent can be used. Specifically, for example, an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, a peroxide crosslinking agent, a urea crosslinking agent, a metal alkoxide crosslinking agent, a metal chelate crosslinking agent, a metal salt Examples thereof include a system crosslinking agent, a carbodiimide crosslinking agent, an oxazoline crosslinking agent, an aziridine crosslinking agent, and an amine crosslinking agent. As the crosslinking agent, an isocyanate crosslinking agent or an epoxy crosslinking agent is suitable. Moreover, the said crosslinking agent can be used individually or in combination of 2 or more types.

  In the present invention, instead of using a cross-linking agent or using a cross-linking agent, it is possible to carry out a cross-linking treatment by irradiation with an electron beam or ultraviolet rays.

  The adhesive layer 4 can be appropriately mixed with other additives as necessary. Examples of other additives include fillers (fillers), flame retardants, silane coupling agents, ion trapping agents, bulking agents, antioxidants, antioxidants, and surfactants.

  The filler may be either an inorganic filler or an organic filler, but an inorganic filler is suitable. By blending a filler such as an inorganic filler, the adhesive layer 4 can be improved in thermal conductivity, adjusted in elastic modulus, and the like. Examples of the inorganic filler include silica, clay, gypsum, calcium carbonate, barium sulfate, alumina, beryllium oxide, silicon carbide, silicon nitride, aluminum nitride, and other ceramics, aluminum, copper, silver, gold, nickel, chromium, Examples include various inorganic powders made of metals such as lead, tin, zinc, palladium, solder, alloys, and other carbon. A filler can be used individually or in combination of 2 or more types. Among these, silica or alumina is particularly suitable as the filler, and fused silica is particularly suitable as the silica. In addition, it is preferable that the average particle diameter of an inorganic filler exists in the range of 0.001 micrometer-80 micrometers. The average particle diameter of the inorganic filler can be measured by, for example, a laser diffraction type particle size distribution measuring apparatus.

  The blending amount of the filler (particularly inorganic filler) is preferably 98% by weight or less (0% by weight to 98% by weight) with respect to the organic resin component, and particularly in the case of silica, 0% by weight to 70% by weight. In the case of a functional inorganic filler such as heat conduction or conductivity, the content is preferably 10% by weight to 98% by weight.

  Examples of the flame retardant include antimony trioxide, antimony pentoxide, and brominated epoxy resin. A flame retardant can be used individually or in combination of 2 or more types. Examples of the silane coupling agent include β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and the like. A silane coupling agent can be used individually or in combination of 2 or more types. Examples of the ion trapping agent include hydrotalcites and bismuth hydroxide. An ion trap agent can be used individually or in combination of 2 or more types.

  The adhesive layer 4 contains, in particular, (A) an epoxy resin, (B) a curing agent, (C) an acrylic resin or a phenoxy resin, and (D) a surface-treated inorganic filler from the viewpoints of adhesiveness and reliability. It is preferable to do.

  (A) By using an epoxy resin, high adhesiveness, water resistance, and heat resistance can be obtained. As the epoxy resin, the above-described known epoxy resins can be used. (B) The above-mentioned well-known hardening | curing agent can be used for a hardening | curing agent.

(C) Acrylic resin has both high flexibility and strength and high toughness. A preferable acrylic resin has a Tg (glass transition temperature) of −50 ° C. to 50 ° C., and is obtained by polymerizing a monomer having an epoxy group, a glycidyl group, an alcoholic hydroxyl group, a phenolic hydroxyl group or a carboxyl group as a crosslinkable functional group. It is a crosslinkable functional group-containing (meth) acrylic copolymer. Furthermore, higher toughness can be obtained by containing acrylonitrile or the like and exhibiting rubber properties.
In addition, (C) phenoxy resin has high strength because phenoxy resin has a long molecular chain and is similar in structure to epoxy resin, acts as a flexible material in a composition with high crosslink density, and imparts high toughness. However, a tough composition can be obtained. Preferable phenoxy resins are those having a main skeleton of bisphenol A type, and other preferable examples include commercially available phenoxy resins such as bisphenol F type phenoxy resin, bisphenol A / F mixed type phenoxy resin and brominated phenoxy resin.

  (D) As the surface-treated inorganic filler, an inorganic filler surface-treated with a coupling agent can be mentioned. As the inorganic filler, the above-mentioned known inorganic fillers can be used, for example, silica and alumina. Due to the surface treatment with the coupling agent, the dispersibility of the inorganic filler is improved. For this reason, since the adhesive bond layer excellent in fluidity | liquidity can be obtained, the adhesive force with the metal layer 3 can be improved. Further, since the inorganic filler can be highly filled, the water absorption rate can be lowered and the moisture resistance can be improved.

  For example, the surface treatment of the inorganic filler with the silane coupling agent is performed by dispersing the inorganic filler in the silane coupling agent solution by a known method, so that the hydroxyl group and the silane coupling agent present on the surface of the inorganic filler are mixed. This is performed by reacting a hydrolyzable group such as an alkoxy group with a hydrolyzed silanol group to form a Si—O—Si bond on the surface of the inorganic filler.

  The thickness of the adhesive layer 4 is not particularly limited, but is usually 3 μm or more, more preferably 5 μm or more, from the viewpoint of easy handling and heat dissipation, and 150 μm or less in order to contribute to thinning of the semiconductor package. Is preferable, and 100 μm or less is more preferable. The adhesive layer 4 may be composed of a single layer or a plurality of layers.

  The adhesive layer 4 has a peeling force (23 ° C., peeling angle of 180 degrees, linear speed of 300 mm / min) with the metal layer 3 in the B stage (uncured state or semi-cured state) of 0.3 N or more. Is preferred. If the peeling force is less than 0.3 N, peeling may occur between the adhesive layer 4 and the metal layer 3 during singulation (dicing).

The water absorption rate of the adhesive layer 4 is preferably 1.5 vol% or less. The method for measuring the water absorption rate is as follows. That is, using a 50 × 50 mm adhesive layer 4 (film adhesive) as a sample, the sample was dried in a vacuum dryer at 120 ° C. for 3 hours, allowed to cool in a desiccator, and then measured for dry mass. And M1. The sample is immersed in distilled water at room temperature for 24 hours and then taken out. The surface of the sample is wiped off with a filter paper and quickly weighed to obtain M2. The water absorption rate is calculated by the following equation (1).
Water absorption (vol%) = [(M2-M1) / (M1 / d)] × 100 (1)
Here, d is the density of the film.
If the water absorption exceeds 1.5 vol%, package cracks may occur during solder reflow due to the absorbed water.

The saturated moisture absorption rate of the adhesive layer 4 is preferably 1.0 vol% or less. The method for measuring the saturated moisture absorption rate is as follows. That is, a circular adhesive layer 4 (film adhesive) having a diameter of 100 mm was used as a sample, the sample was dried at 120 ° C. for 3 hours in a vacuum dryer, allowed to cool in a desiccator, and then the dry mass was measured. To do. The sample is absorbed in a constant temperature and humidity chamber at 85 ° C. and 85% RH for 168 hours, then taken out, and weighed quickly to obtain M2. The saturated moisture absorption rate is calculated by the following equation (2).
Saturated moisture absorption (vol%) = [(M2-M1) / (M1 / d)] × 100 (2)
Here, d is the density of the film.
When the saturated moisture absorption rate exceeds 1.0 vol%, the value of vapor pressure increases due to moisture absorption during reflow, and good reflow characteristics may not be obtained.

The residual volatile content of the adhesive layer 4 is preferably 3.0 wt% or less. The method for measuring the remaining volatile components is as follows. That is, using an adhesive layer 4 (film adhesive) having a size of 50 × 50 mm as a sample, measuring the initial mass of the sample as M1, and heating the sample at 200 ° C. for 2 hours in a hot air circulating thermostat, Weigh to M2. The remaining volatile content is calculated by the following equation (3).
Residual volatile matter (wt%) = [(M2-M1) / M1] × 100 (3)
If the residual volatile content exceeds 3.0 wt%, the solvent is volatilized by heating during packaging, and voids are generated inside the adhesive layer 4, which may cause package cracks.

  The ratio of the linear expansion coefficient of the metal layer 3 to the linear expansion coefficient of the adhesive layer 4 (the linear expansion coefficient of the metal layer 3 / the linear expansion coefficient of the adhesive layer 4) is preferably 0.2 or more. If the ratio is less than 0.2, peeling between the metal layer 3 and the adhesive layer 4 is likely to occur, and package cracking may occur during packaging, which may reduce reliability.

  Next, a method for manufacturing the electronic device package tape 1 according to the present embodiment will be described. First, a long metal layer 3 is prepared. As the metal layer 3, a commercially available metal foil may be used. Next, as shown in FIG. 5A, the metal layer 3 is bonded to the adhesive surface of the long base tape 2 using a bonding roller r or the like.

  Separately, a long film adhesive layer 4 is formed. The adhesive layer 4 can be formed using a conventional method of preparing a resin composition and forming it into a film-like layer. Specifically, for example, the resin composition is applied on a suitable separator (such as release paper) and dried (in the case where heat curing is necessary, heat treatment is performed as necessary to dry), Examples include a method of forming the adhesive layer 4. The resin composition may be a solution or a dispersion.

  Next, as shown in FIG. 5B, the adhesive layer 4 peeled from the separator is bonded onto the metal layer 3 bonded to the base tape 2 using a bonding roller r or the like.

  In addition, in the above, after bonding the metal layer 3 to the base tape 2, the adhesive layer 4 was bonded onto the metal layer 3, but the metal layer 3 and the adhesive layer 4 were bonded together. Then, the surface on the metal layer 3 side may be bonded to the base tape 2.

  Next, as shown in FIG. 5C, the adhesive layer 4 and the metal layer 3 are preliminarily separated into a predetermined size by using a grid-like pressing tooth whose outer edge is a predetermined label shape (here circular shape). In addition to being singulated, it is pre-cut so that the overall shape becomes a predetermined label shape, and the surrounding unnecessary portion 6 is peeled off from the base tape 2 and removed as shown in FIG. Here, the singulation is performed so that the size of the plane of the metal layer 3 = the size of the plane of the adhesive layer 4 <the size of the plane of the second surface of the semiconductor chip C.

  The method for forming the metal layer 3 and the adhesive layer 4 having a predetermined shape on the base tape 2 is not limited to the above, and the long metal layer 3 is formed on the long base tape 2. After bonding and punching into a predetermined shape and removing the unnecessary portion 6, the adhesive layer 4 formed in a predetermined shape may be bonded onto the metal layer 3 having a predetermined shape, The metal layer 3 and the adhesive layer 4 formed in the above may be bonded to the base tape 2. In particular, as shown in FIG. 9, when the size of the plane of the metal layer 3 is smaller than the size of the plane of the adhesive layer 4, the metal layer 3 is manufactured by such a method. However, it is preferable to manufacture by the process shown to above-mentioned FIG. 5 (A)-(D) from the simplicity of the procedure of a manufacturing process. 5A to 5D, if the adhesive layer 4 and the metal layer 3 are separated into a predetermined size in advance, the size of the plane of the metal layer 3 = adhesion A laminate of the adhesive layer 4 and the metal layer 3 having a plane size of the agent layer 4 can be obtained, and only by positioning and mounting on the back surface of the electronic device of this laminate, Since the adhesive layer 4 and the metal layer 3 can be mounted at a time, the procedure of mounting the adhesive layer and the metal layer on the electronic device is excellent in terms of simplicity. Further, since it is not necessary to align the metal layer 3 and mount it on the adhesive layer 4, the mounting position of the metal layer 3 does not shift, and the mountability is excellent.

  Separately, the adhesive tape 5 is produced. The base film can be formed by a conventionally known film forming method. Examples of the film forming method include a calendar film forming method, a casting method in an organic solvent, an inflation extrusion method in a closed system, a T-die extrusion method, a co-extrusion method, and a dry lamination method. Next, the pressure-sensitive adhesive layer composition is applied on the base film 51 and dried (heat-crosslinked as necessary) to form the pressure-sensitive adhesive layer 52. Examples of the coating method include roll coating, screen coating, and gravure coating. The pressure-sensitive adhesive layer composition may be directly applied to the base film 51 to form the pressure-sensitive adhesive layer 52 on the base film 51, and the pressure-sensitive adhesive layer composition was subjected to a peeling treatment on the surface. After the pressure-sensitive adhesive layer 52 is formed by applying to release paper or the like, the pressure-sensitive adhesive layer may be transferred to the base film 51. Thereby, the adhesive tape 5 in which the adhesive layer 52 was formed on the base film 51 is produced.

  Thereafter, as shown in FIG. 6 (A), the pressure-sensitive adhesive layer 52 of the pressure-sensitive adhesive tape 5 is formed on the surface of the metal layer 3 and the adhesive layer 4 on the side of the adhesive layer 4 provided on the base tape 2. The adhesive tape 5 is laminated so that the side surface contacts.

  Next, as shown in FIG. 6 (B), the adhesive tape 5 is pre-cut into a predetermined shape using a press cutting blade or the like, and the surrounding unnecessary portion 7 is removed from the base tape 2 as shown in FIG. 6 (C). The tape 1 for electronic device package is made by peeling and removing. After that, the base tape 2 used for the precut process may be peeled off and a known separator may be bonded to the adhesive layer 52 of the adhesive tape 5.

<How to use>
Next, a method for manufacturing the electronic device package 8 using the electronic device package tape 1 of the present embodiment will be described with reference to FIGS.

[Mounting process of semiconductor wafer W]
First, an adhesive tape D separate from the electronic device package tape 1 of the present invention is prepared, and a semiconductor wafer W is attached to the center of the adhesive tape D as shown in FIG. Then, the ring frame R is bonded to the peripheral portion of the adhesive tape D while the adhesive is held and fixed (mounting process of the semiconductor wafer W). At this time, the adhesive tape D is attached to the back surface of the semiconductor wafer W. The back surface of the semiconductor wafer W means a surface opposite to the circuit surface (also referred to as a non-circuit surface or a non-electrode forming surface). Although the sticking method is not specifically limited, the method by thermocompression bonding is preferable. The crimping is usually performed while pressing with a pressing means such as a crimping roll.

[Dicing process of semiconductor wafer W]
Next, as shown in FIG. 7B, dicing of the semiconductor wafer W is performed. As a result, the semiconductor wafer W is cut into a predetermined size and divided into pieces (small pieces), whereby the semiconductor chip C is manufactured. For example, the dicing is performed from the circuit surface side of the semiconductor wafer W according to a conventional method. Further, in this step, for example, a cutting method called full cut that cuts up to the adhesive tape D can be adopted. It does not specifically limit as a dicing apparatus used at this process, A conventionally well-known thing can be used. In addition, when expanding the adhesive tape D, this expand can be performed using a conventionally well-known expand apparatus.

[Pickup process of semiconductor chip C]
As shown in FIG. 7C, the semiconductor chip C is picked up, and the semiconductor chip C is peeled off from the adhesive tape D. The pickup method is not particularly limited, and various conventionally known methods can be employed. For example, the adhesive tape D on which the semiconductor chip C and the ring frame R are bonded is placed on the stage S of the pickup device with the base film side down, and the ring frame R is fixed in a hollow cylindrical shape. The push-up member T is raised and the adhesive tape D is expanded. In this state, there is a method in which each semiconductor chip C is pushed up by a pin N from the base film side of the adhesive tape D, and the pushed-up semiconductor chip C is picked up by a pickup device.

[Flip chip connection process]
As shown in FIG. 7D, the picked-up semiconductor chip C is fixed to an adherend 9 such as a substrate by a flip chip bonding method (flip chip mounting method). Specifically, the semiconductor chip C is always placed on the adherend 9 such that the circuit surface (also referred to as a surface, a circuit pattern formation surface, an electrode formation surface, etc.) of the semiconductor chip C faces the adherend 9. Fix according to law. For example, first, flux is attached to the bumps 10 as connection portions formed on the circuit surface side of the semiconductor chip C. Next, the bump 10 and the conductive material 11 are melted while bringing the bump 10 of the semiconductor chip C into contact with the bonding conductive material 11 (solder or the like) attached to the connection pad of the adherend 9 and pressing it. The electrical conduction between the semiconductor chip C and the adherend 9 can be ensured, and the semiconductor chip C can be fixed to the adherend 9 (flip chip bonding step). At this time, a gap is formed between the semiconductor chip C and the adherend 9, and the air gap distance is generally about 30 μm to 300 μm. The flux remaining on the opposing surface or gap between the semiconductor chip C and the adherend 9 is removed by washing.

  Next, as shown in FIG. 8, the base tape 2 for the electronic device package 8 according to the present embodiment is peeled to expose the pressure-sensitive adhesive layer of the metal layer 3 and the pressure-sensitive adhesive tape 5, and the periphery of the pressure-sensitive adhesive layer. The part is fixed to the ring frame R. Then, the separated metal layer 3 and adhesive layer 4 are picked up and separated from the adhesive tape 5. The pickup can be performed in the same process as the semiconductor chip C pickup process described above.

  Next, the picked-up metal layer 3 and the adhesive layer 4 side of the adhesive layer 4 are bonded to the back surface of the semiconductor chip C that is flip-chip connected. Thereafter, the periphery of the semiconductor chip C with the metal layer 3 and the gap between the semiconductor chip C and the adherend 9 are filled with a sealing material (such as a sealing resin) and sealed. Sealing is performed according to a conventional method. At this time, the size of the plane of the metal layer 3 = the size of the plane of the adhesive layer 4 <the size of the plane of the second surface of the semiconductor chip C, and the adhesive layer 4 is flat from the outer edge of the semiconductor chip C. The metal layer 3 does not protrude in the planar direction from the outer edge of the adhesive layer 4, and the electronic device is sealed by the pressure of the sealing resin when sealing the electronic device package. The adhesive layer 4 and the metal layer 3 are not peeled off from the outer edge portion. Therefore, the warp caused by the difference in thermal expansion coefficient between the semiconductor chip C and the adherend 9 in the flip chip bonding process is effectively offset by the difference in thermal expansion coefficient between the semiconductor chip C and the metal layer 3. Further, heat generated during use as an electronic device is effectively dissipated by the metal layer 3.

  In the present embodiment, the electronic device package tape 1 in which the metal layer 3 and the adhesive layer 4 are individually separated is used. However, the metal layer 3 and the adhesive layer 4 that are not individually separated are stacked. The body may be picked up after being diced so as to be smaller than the size of the plane of the second surface of the semiconductor chip, and bonded to the back surface of the flip-chip connected semiconductor chip C. Further, the metal layer 3 and the adhesive layer 4 are diced so that the size of the plane of the metal layer 3 <the size of the plane of the adhesive layer 4 <the size of the plane of the second surface of the semiconductor chip C. Alternatively, the adhesive layer 4 and the metal layer 3 may be bonded to the back surface of the semiconductor chip C flip-chip connected in this order.

  In this embodiment, the pressure-sensitive adhesive layer 52, the adhesive layer 4, and the metal layer 3 are provided in this order. However, the pressure-sensitive adhesive layer 52, the metal layer 3, and the adhesive layer 4 are provided in this order. Also good.

  Further, in the present embodiment, the electronic device package tape 1 in which a plurality of adhesive layers 4 and metal layers 3 each having a circular label shape are provided on the base tape 2 is used. A long adhesive layer and a metal layer having the same width as the width of the individual pieces of the metal layer 3 (the width when the adhesive layer 4 and the metal layer 3 are bonded to an electronic device) May be used in this order, and a tape for an electronic device package may be used. A well-known thing can be used for a separator and the same thing as the above-mentioned thing can be used for an adhesive bond layer and a metal layer. When using such an electronic device packaging tape, cut the adhesive layer and the metal layer to a length to be bonded to the electronic device, peel off the cut pieces of the adhesive layer and the metal layer from the separator, The adhesive layer side of the piece is bonded to an electronic device. In this case, the size of the plane of the metal layer = the size of the plane of the adhesive layer, but the size of the plane of the adhesive layer and the metal layer <the size of the plane of the second surface of the electronic device is designed. .

  Moreover, the width | variety is the same as the width | variety of the piece of the adhesive bond layer 4 (width | variety at the time of bonding to an electronic device), and a long adhesive layer and a separator with the same width in this order on a long separator. Adhesive tape stacked and wound in a reel shape, and reel shape in which a long metal layer is wound in a reel shape with the same width as the width of the individual metal layer 3 (width when mounted on an electronic device) The metal layer may be prepared separately. A well-known thing can be used for a separator and the same thing as the above-mentioned thing can be used for an adhesive bond layer and a metal layer. When using such an adhesive tape and a reel-like metal layer, first, one separator of the adhesive tape is peeled off, and the adhesive layer is cut to a length to be bonded to an electronic device. The piece is peeled off from the other separator and attached to the electronic device. Next, the reel-shaped metal layer is cut into a length to be mounted on the electronic device, and the cut pieces of the metal layer are bonded to the electronic device through the adhesive layer and mounted. In this case, it is designed so that the size of the plane of the metal layer ≦ the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device.

<Example>
Next, in order to further clarify the effects of the present invention, examples and comparative examples will be described in detail, but the present invention is not limited to these examples.

(1) Preparation of adhesive tape <Adhesive layer composition (1)>
As the acrylic copolymer (A1) having a functional group, a copolymer comprising 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate and methacrylic acid, the ratio of 2-ethylhexyl acrylate being 60 mol%, and the weight average molecular weight being 700,000 Was prepared. Next, 2-isocyanatoethyl methacrylate is added so that the iodine value becomes 20, and an acrylic copolymer (a1) having a glass transition temperature of −50 ° C., a hydroxyl value of 10 mgKOH / g, and an acid value of 5 mgKOH / g. Was prepared.

  To 100 parts by mass of the acrylic copolymer (a1), 5 parts by mass of Coronate L (trade name, manufactured by Tosoh Corporation) is added as a polyisocyanate, and Esacure KIP 150 (trade name, Lamberti) is used as a photopolymerization initiator. The mixture obtained by adding 3 parts by mass of the product was dissolved in ethyl acetate and stirred to prepare an adhesive layer composition (1).

The following was produced as a base film.
<Base film (1)>
Resin beads of ethylene-methacrylic acid copolymer were melted at 200 ° C. and formed into a long film having a thickness of 100 μm and a loop stiffness of 7 mN using an extruder to prepare a base film (1). As the ethylene-methacrylic acid copolymer, Nucleol NO35C (trade name) manufactured by Mitsui DuPont Polychemical Co., Ltd. was used.

<Adhesive tape (1)>
The pressure-sensitive adhesive layer composition (1) is applied to a release liner made of a polyethylene-terephthalate film subjected to a release treatment so that the thickness after drying becomes 10 μm, and dried at 110 ° C. for 3 minutes to give a pressure-sensitive adhesive. After making it into a layer, it was bonded to the base film (1) to produce an adhesive tape (1).

(2) Preparation of adhesive layer <Adhesive layer (1)>
Acrylic resin (manufactured by Nagase ChemteX Corporation, trade name “Taisan Resin SG-P3”, Mw 850,000, Tg 12 ° C.) 80 parts by mass and naphthalene type epoxy resin (manufactured by DIC Corporation, trade name “HP-4700”) 10 An adhesive layer composition solution was prepared by dissolving 10 parts by mass of phenol resin (trade name “MEH7851”, manufactured by Meiwa Kasei Co., Ltd.) as a curing agent in methyl ethyl ketone. This adhesive layer composition solution was applied on a release film (release liner) made of a polyethylene terephthalate film having a thickness of 50 μm after the silicone release treatment, and then dried at 130 ° C. for 5 minutes. Thereby, an adhesive layer (1) having a thickness of 10 μm was produced.

(3) Preparation of metal layer <Metal layer (1)>
GTS-MP (trade name, manufactured by Furukawa Electric Co., Ltd., copper foil, thickness 35 μm)

(4) Production of base tape

The following was produced as a base tape.
(Resin film d-1)
Styrene-hydrogenated isoprene-styrene block copolymer (SEPS) (Kuraray Co., Ltd., trade name “Septon KF-2104”) and homopropylene (PP) (Ube Industries, Ltd., trade name “J-105G”) ) Was melted at 200 ° C. at a blending ratio of 40:60, and formed into a long film having a thickness of 90 μm using an extruder, thereby producing a resin film d-1.

(Adhesive layer composition e-1 for substrate tape)
The acrylic copolymer (A2) having a functional group is composed of 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate and methacrylic acid, the ratio of 2-ethylhexyl acrylate is 70 mol%, the weight average molecular weight is 500,000, and the glass transition temperature. An acrylic copolymer (a2) having a hydroxyl value of 30 gKOH / g and an acid value of 5 mgKOH / g was prepared at -50 ° C.
8 parts by mass of a polyisocyanate compound (trade name “Coronate L”, manufactured by Tosoh Corporation) is added to 100 parts by mass of the acrylic copolymer (a2), dissolved in ethyl acetate, stirred, and the base material Tape adhesive layer composition e-1 was obtained.
<Base tape (1)>

  The prepared pressure-sensitive adhesive layer composition for base tape e-1 was applied to a release liner made of a polyethylene-terephthalate film that had been subjected to a release treatment so that the thickness after drying would be 10 μm, and at 110 ° C. for 3 minutes. After making it dry, it bonded together with the said resin film d-1, and produced the base tape (1) in which the adhesive layer for base tapes was formed on the resin film.

(5) Production of electronic device package <Example 1>
The metal layer (1) obtained as described above and the adhesive layer (1) side of the separator-attached adhesive layer (1) are bonded at a bonding angle of 120 °, a pressure of 0.2 MPa, and a speed of 10 mm / s. After the bonding, the base tape (1) was bonded onto the metal layer under the conditions of a bonding angle of 120 °, a pressure of 0.2 MPa, and a speed of 10 mm / s. The adhesive layer (1) and the metal layer (1) were pre-cut so as to have a circular label shape smaller than the adhesive tape (1) and to be separated into 9.4 × 9.4 mm squares. The separator is peeled from the adhesive layer and the exposed adhesive layer side and the adhesive layer of the adhesive tape (1) are separated from the base tape (1) around the metal layer and the adhesive layer. They were stuck together so that they touch. Next, the pressure-sensitive adhesive tape was pre-cut into a circular shape so as to be concentric with the metal layer and the adhesive layer, and unnecessary peripheral portions were peeled off and removed from the base tape (1) to produce an electronic device package tape. .

  Using a die bonding material (trade name “AF3836”, manufactured by Furukawa Electric Co., Ltd.) on a 20 mm × 20 mm substrate, a 10 mm square chip is bonded so that the height difference from the substrate is 100 μm, and a flip chip One hundred samples were made as if they were connected chips.

(Mounting process of adhesive layer and metal layer on chip)
The pressure-sensitive adhesive layer was irradiated with 200 mJ / cm ² of ultraviolet rays from an air-cooled high pressure mercury lamp (80 W / cm, irradiation distance 10 cm) from the base film side of the electronic device package tape. Pickup was performed on 100 individual samples of the adhesive layer and metal layer in the central part of the electronic device package tape, and the adhesive layer and metal layer were mounted on the chip. Then, it molded with the sealing material (Kyocera Chemical Co., Ltd. make, brand name "KE-G3000D"), and produced the electronic device package sample which concerns on Example 1. FIG.

<Example 2>
The metal layer (1) obtained as described above and the pressure-sensitive adhesive layer (1) side of the base tape (1) are bonded together under the conditions of a bonding angle of 120 °, a pressure of 0.2 MPa, and a speed of 10 mm / s. After that, the metal layer (1) has a circular label shape smaller than the adhesive tape (1) so as to reach the base tape (1) from the surface of the metal layer (1), and is separated into 9 mm × 8.4 mm. So that it was pre-cut. The metal layer (1) side of the separated metal layer (1) with the base tape (1) and the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape (1) are bonded to each other at an angle of 120 °, a pressure of 0.2 MPa, and a speed of 10 mm / After bonding under the conditions of s, the adhesive tape (1) is pre-cut into a circular shape so as to be concentric with the metal layer (1) so as to reach the separator from the surface of the base film (1), and the surrounding area is unnecessary. The part was peeled off from the separator and removed to prepare an adhesive tape with a metal layer.

  Moreover, the adhesive layer (1) of the adhesive layer with a separator (1) was pre-cut so as to have a circular label shape smaller than the pressure-sensitive adhesive tape (1) and to be separated into 9 mm × 9.4 mm. Then, the adhesive layer (1) side of the separated adhesive layer with separator (1) and the adhesive layer of the adhesive tape (1) are bonded to each other at an angle of 120 °, a pressure of 0.2 MPa, and a speed of 10 mm / s. After pasting together, the adhesive tape (1) is pre-cut into a circular shape so as to be concentric with the adhesive layer (1) so as to reach the separator from the surface of the base film (1), and the surrounding area is unnecessary. The part was peeled off from the separator and removed to prepare an adhesive tape with an adhesive layer.

  In addition, 100 samples that were regarded as flip-chip connected chips as in Example 1 were produced.

(Mounting process of adhesive layer and metal layer on chip)
The pressure-sensitive adhesive layer was irradiated with ultraviolet rays of 200 mJ / cm ² from the base film side of the pressure-sensitive adhesive tape with the adhesive layer by an air-cooled high-pressure mercury lamp (80 W / cm, irradiation distance 10 cm). Pickup was performed on 100 individual samples of the adhesive layer at the center of the adhesive tape with the adhesive layer, and the adhesive layer was mounted on the chip. Thereafter, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays of 200 mJ / cm ² from the base film side of the metal layer-attached pressure-sensitive adhesive tape with an air-cooled high-pressure mercury lamp (80 W / cm, irradiation distance 10 cm). Pickup was performed on 100 individual samples of the metal layer at the center of the adhesive tape with the metal layer, and the metal layer was mounted on the adhesive layer on the chip. Then, it molded with the sealing material (Kyocera Chemical Co., Ltd. make, brand name "KE-G3000D"), and produced the electronic device package which concerns on Example 2. FIG.

<Example 3>
The electronic device according to Example 3 is the same as Example 2, except that the size of the chip is 4 mm × 20 mm, the size of the adhesive layer is 4 mm × 18 mm, and the size of the metal layer is 3.6 mm × 18 mm. A device package was fabricated.

<Comparative Example 1>
Except that the size of the chip was 10 mm × 10 mm, the size of the adhesive layer was 10.4 mm × 10.4 mm, and the size of the metal layer was 10.4 mm × 10.4 mm, the same as in Example 1, An electronic device package of Comparative Example 1 was produced.

<Comparative example 2>
Except that the size of the chip was 10 mm × 10 mm, the size of the adhesive layer was 9.4 mm × 9.4 mm, and the size of the metal layer was 10.4 mm × 10.4 mm, An electronic device package of Comparative Example 2 was produced.

<Comparative Example 3>
Except that the size of the chip was 10 mm × 10 mm, the size of the adhesive layer was 10.4 mm × 10.4 mm, and the size of the metal layer was 9.4 mm × 9.4 mm, An electronic device package of Comparative Example 3 was produced.

  The following evaluation was performed about the electronic device package which concerns on Examples 1-3 and Comparative Examples 1-3.

(Workability)
When manufacturing the electronic device package according to each of the examples and comparative examples, the workability of the mounting process of the adhesive layer and the metal layer on the chip was evaluated from the following viewpoints. First, for the simplicity of the procedure, points that can be mounted in one step were evaluated as point 1, and those that required two or more steps for mounting were evaluated as point 0. The results are shown in Table 1. Also, regarding the mountability, the mounting position of the adhesive layer and the metal layer on the chip is observed with an optical microscope, the deviation from the target mounting position is measured, and the number of samples with a deviation of 0.2 mm or more is 0% Were evaluated as point 2, points exceeding 0% and less than 10% as points 1, and points exceeding 10% as points 0. The results are shown in Table 1. The sum of points of simplicity of the procedure and mountability was evaluated as “good” in terms of workability as “3”, “1” or 2 as “acceptable”, and “0” as defective as “bad”. The results are shown in Table 2.

(Presence or absence of peeling)
The electronic device package according to each example and comparative example was cut, and the cross section was observed with an optical microscope. ○ that the peeling or lifting of the adhesive layer or metal layer from the chip is not confirmed as a good product, x that the peeling or lifting of the adhesive layer from the chip is confirmed as defective, × 1, peeling or lifting of the metal layer from the chip Was confirmed as x2 as a defective product. The results are shown in Table 2.

  As shown in Table 2, the electronic device packages according to Examples 1 to 3 have the size of the plane of the metal layer ≦ the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device. No peeling occurred between the chip and the adhesive layer and between the adhesive layer and the metal layer. Moreover, since the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device, the result was that the mounting property on the chip was good. Furthermore, since the electronic device package according to Example 1 has the plane size of the metal layer = the size of the plane of the adhesive layer, the electronic device package is particularly excellent in mountability on the chip, and simplifies the mounting procedure on the chip. Also gave excellent results.

  On the other hand, in the electronic device package according to Comparative Examples 1 and 3, since the size of the plane of the adhesive layer> the size of the plane of the second surface of the electronic device, it is between the chip and the adhesive layer. Peeling occurred. In the electronic device package according to Comparative Example 2, since the size of the plane of the metal layer> the size of the plane of the adhesive layer, peeling occurred between the adhesive layer and the metal layer.

1: Tape for electronic device package 2: Base tape 3: Metal layer 4: Adhesive layer 5: Adhesive tape 5a: Label portion 5b: Peripheral portion

Claims (6)

A substrate,
An electronic device connected to the substrate such that the first surface faces the substrate;
An adhesive layer provided on the second surface of the electronic device opposite to the first surface;
Having a metal layer adhered to the second surface of the electronic device via the adhesive layer;
The size of the plane of the metal layer ≦ the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device.   The electronic device package according to claim 1, wherein the metal layer includes copper or aluminum. Connecting an electronic device to the substrate such that the first surface faces the substrate;
Adhering a metal layer to the second surface of the electronic device opposite to the first surface via an adhesive layer;
The size of the plane of the metal layer ≦ the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device.   The method for manufacturing an electronic device package according to claim 3, wherein the metal layer contains copper or aluminum. An adhesive tape having a base film and an adhesive layer;
The adhesive layer has a laminate of a metal layer and an adhesive layer provided on the opposite side of the base film of the pressure-sensitive adhesive layer, and the metal layer has the first surface facing the substrate. An electronic device package tape that is bonded to the second surface of the electronic device connected to the substrate on the second surface opposite to the first surface via the adhesive layer,
The size of the plane of the metal layer ≦ the size of the plane of the adhesive layer <the size of the plane of the second surface of the electronic device is pre-cut and separated into pieces. An electronic device package tape characterized by being made. 6. The electronic device package tape according to claim 5, wherein the metal layer contains copper or aluminum.

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