KR101763458B1 - Adhesive reel - Google Patents

Abstract

The adhesive reel according to the present invention comprises a winding core, a pair of side plates provided opposite to each other on both sides of the winding core, a tape-like base material and an adhesive layer provided on one side thereof, And the adhesive tape is wound on the winding core so that the surface of the substrate on which the adhesive layer is not formed faces the winding core side.

Description

Adhesive Reel {ADHESIVE REEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive reel, and more particularly, to an adhesive reel in which an adhesive tape having a tape-like base material and an adhesive layer provided on one side thereof is wound on a winding core.

Anisotropic Conductive Film (ACF) is used as a connecting material for electrically connecting circuit members having a plurality of electrodes to each other to produce a circuit connecting member. When an anisotropic conductive film is used to connect a member such as a semiconductor element or a package such as IC or LSI to a substrate such as a printed wiring board, a glass substrate for LCD, or a flexible printed substrate, the conductive state between the opposing electrodes is maintained, And is a connecting material for performing electrical connection and mechanical fixing so as to maintain insulation between the electrodes. In addition to anisotropic conductive films, connection materials such as non-conductive films (NCF) are known.

The connecting material includes an adhesive component containing a thermosetting resin and conductive particles, which are blended if necessary in the case of an anisotropic conductive film, and is formed into a film on a substrate such as a polyethylene terephthalate film (PET film). The master of the obtained film is cut into a tape shape so as to have a width suitable for the intended use, and is wound around a winding core to produce an adhesive reel (see Patent Document 1).

However, one of the causes for lowering the connection reliability of the circuit connector is a phenomenon called blocking. The blocking is a phenomenon in which the adhesive layer is transferred to the back surface of the substrate when the adhesive tape in a wound state is taken out and used. Since the adhesive layer provided on one side of the substrate is in an uncured state, it has a certain degree of fluidity. When the adhesive reel is left for a long time, the adhesive agent seeps out from the end face of the adhesive tape, which may adhere to the side plate of the reel. When the adhesive tape is pulled out from the reel in this state, there is a problem that a part of the adhesive layer is transferred to the back surface of the substrate and a problem that the adhesive layer is peeled off from the substrate and only the substrate is pulled out.

Fig. 9 is a cross-sectional view schematically showing an example of blocking occurring when the adhesive tape is pulled out from a conventional adhesive reel. Fig. The adhesive tape 25 shown in Fig. 9 is wound around the winding core 1 such that the adhesive layer 28 faces the inner side of the winding core (the base material 26 faces outward).

If blocking occurs when the adhesive tape is pulled out, when a part of the adhesive layer is transferred to the back surface of the substrate, a necessary amount of adhesive layer can not be arranged at a predetermined position on the circuit member and the electrical connection or mechanical fixing of the connection portion is insufficient There is a risk of it becoming dangerous. Further, in the case where the adhesive layer is peeled off from the base material and only the base material is taken out, the production facility must be stopped and the productivity is greatly lowered. It is very important to increase the number of production per hour in order to provide cost competitiveness in fields requiring circuit production, such as circuit connecting bodies, semiconductor chips, and printed wiring boards. For example, even a stoppage time of several minutes is very significant. As a result, blocking improvements have been strongly desired in such fields (Patent Documents 2 to 8).

Patent Documents 2 and 3 disclose a technique for suppressing blocking from the viewpoint of the shape of the adhesive tape. An adhesive tape provided with an adhesive layer having a width narrower than the width of the substrate on the inner side in the width direction of the substrate Lt; / RTI > Patent Document 4 discloses a technique for suppressing blocking from the viewpoint of the composition of an adhesive, and discloses an adhesive tape in which the tautness against the substrate is kept within a predetermined range. Patent Document 5 discloses a technique for suppressing blocking from the viewpoint of use conditions, and discloses an attaching apparatus having means for controlling the temperature of the reel. Patent Document 6 discloses a technique for suppressing blocking from the viewpoint of the structure of a reel component on which an adhesive tape is wound, and discloses an adhesive reel in which a rib structure provided on a side plate has conductivity. Patent Document 7 discloses a technique for suppressing blocking from the viewpoint of the structure of a substrate, and discloses a rolled body using a material having a dominant difference in the surface tension of the front and back as a base material. Patent Document 8 discloses a technique for suppressing blocking from the viewpoint of homogeneity between an end mark and an adhesive.

Japanese Patent Application Laid-Open No. 2003-34468 WO 08/053824 WO 07/015372 Japanese Patent Application Laid-Open No. 2003-064322 Japanese Patent Application Laid-Open No. 2006-218867 Japanese Patent Application Laid-Open No. 2009-004354 Japanese Patent Application Laid-Open No. 11-293206 Japanese Patent Application Laid-Open No. 2001-284005

As described in the above Patent Documents 2 to 8, from the time when the circuit-connecting adhesive tape has been practically used until recently, a blocking prevention measure has been examined from various points of view, but there is still no breakthrough solution .

It is therefore an object of the present invention to provide an adhesive reel in which the problem that the adhesive layer is peeled off from the base material and only the base material is pulled out when the adhesive tape in the wound state is taken out can be suppressed at an extremely high level. Hereinafter, in the present specification, " blocking " means " a problem that the adhesive layer is peeled off from the base material and only the base material is pulled out when the adhesive tape in the wound state is pulled out ".

The adhesive reel according to the present invention comprises a winding core, a pair of side plates provided opposite to each other on both sides of the winding core, a tape-like base material and an adhesive layer provided on one side thereof, And the adhesive tape is wound around the winding core such that the surface of the base material on which the adhesive layer is not formed faces the winding core side.

Conventionally, in the field of adhesive reels, in order to protect the adhesive layer from the external environment, it was common sense to wind the adhesive tape on the winding core such that the adhesive layer faces the winding core side (inside) and the base material faces outward 3 and 4 of Patent Document 2). For example, when the adhesive layer is directed to the outside, dust adheres to the adhesive layer. Especially, the adhesive tape used for the electronic material is protected from the contamination source by winding the adhesive layer toward the inner side of the winding core because even a little dust is connected to the defective product.

However, the inventors of the present invention tested the adhesive reel by winding the adhesive tape on the winding core so that the base material is directed toward the winding core side (inner side) and the adhesive layer is directed toward the outer side. The presence or absence of occurrence of blocking by the adhesive reel was evaluated, and it was found that blocking can be prevented at an extremely high level.

The reason why the blocking of the adhesive tape can be suppressed to a high level by reversing the front and back of the adhesive tape is not necessarily clear, but the present inventors contemplate as follows. That is, in the present invention, even when the adhesive agent seeps from the end face of the adhesive layer of the adhesive tape and is dot-bonded to the side plate, when the tape is pulled out, the base material located on the The force for separating between the adhesive layer of the adhesive tape to be drawn out and the substrate of the adhesive tape to be drawn out does not act and the influence from the portion which is adhered to the side plate is small, I think it can be achieved.

The length of the adhesive tape that can be wound around the winding core has been limited. However, by employing the above-described configuration, the length of the adhesive tape (for example, 200 m or more) It is possible.

In addition to the lengthening of the adhesive tape, according to the present invention, since the viscosity is relatively low, it becomes possible to employ an adhesive which is likely to cause blocking in the adhesive layer in the prior art. In the present invention, it is preferable that the adhesive layer has a shear viscosity at 30 캜 of 100000 Pa 占 퐏 or less. Examples of the low-viscosity adhesive include a thermosetting type adhesive and a low-temperature curing type adhesive. The low temperature curing type adhesive is required to have high fluidity at a low temperature (for example, 130 to 150 DEG C). As a specific example, a thermosetting curable adhesive containing a radical polymerization initiator having a half-life temperature for one minute of 160 캜 or lower can be mentioned.

According to the present invention, blocking can be sufficiently suppressed even if the adhesive layer contains a large amount of liquid material at 30 占 폚 and has relatively high fluidity. When the thermosetting adhesive of the present invention contains a thermoplastic resin, a radical polymerizable material containing a radical polymerizable substance in a liquid state at 30 占 폚, and a radical polymerization initiator, blocking is likely to occur with a conventional adhesive reel . On the other hand, in the adhesive reel of the present invention, the content of the radically polymerizable substance in the thermosetting adhesive is preferably 20 to 80 parts by mass per 100 parts by mass of the total amount of the thermoplastic resin and the radical polymerizable material .

The adhesive layer may be a thermosetting material comprising a thermoplastic resin, a liquid epoxy resin at 30 占 폚, and an epoxy adhesive containing a curing agent. In the adhesive reel of the present invention, the content of the epoxy resin in the epoxy adhesive is preferably 20% or more, more preferably 20% or less, To 80 parts by mass, the blocking can be sufficiently suppressed.

In the present invention, the content of the inorganic filler in the adhesive layer may be 20% by volume or less based on the volume of the adhesive layer. According to the present invention, even when an inorganic filler is not added to the adhesive layer, or even when the amount is less than 20% by volume, the blocking can be suppressed sufficiently have.

In the present invention, the content of the inorganic filler in the adhesive layer may be 50 mass% or less based on the mass of the adhesive layer. According to the present invention, even if an inorganic filler is not added to the adhesive layer or the blending amount is 50 mass% or less, blocking can be sufficiently suppressed. When silica is used as the inorganic filler, the content thereof is preferably 35 mass% or less based on the mass of the adhesive layer. When alumina is used as the inorganic filler, the content thereof is preferably 50 mass% or less based on the mass of the adhesive layer.

According to the present invention, even if the width of the adhesive tape is 0.5 to 3.0 mm, blocking can be sufficiently suppressed. Compared with a thick tape, the narrow tape has a relatively large influence of the leakage of the adhesive on the end face of the tape, which tends to cause blocking. The adhesive tape is suitable for use in circuit connection. As described above, since the blocking can be suppressed at a high level, it is possible to manufacture circuit connecting bodies with excellent connection reliability.

According to the present invention, when the adhesive tape in the wound state is taken out, the peeling of the adhesive layer from the substrate can be suppressed at an extremely high level.

1 is a perspective view showing an embodiment of an adhesive reel according to the present invention.
Fig. 2 is a cross-sectional view schematically showing the internal structure of the adhesive reel shown in Fig. 1. Fig.
3 is a front view showing an inner side surface of a side plate of an adhesive reel according to the present invention.
4 is a cross-sectional view schematically showing an example of an anisotropic conductive tape.
5 is a cross-sectional view schematically showing an example of a circuit connecting body to which circuit electrodes are connected.
6 is a cross-sectional view schematically showing an example of a method of manufacturing a circuit connector.
7 is a perspective view showing another embodiment of the adhesive reel according to the present invention.
8 is a cross-sectional view schematically showing another example of the anisotropic conductive tape.
Fig. 9 is a cross-sectional view schematically showing an example of blocking occurring when the adhesive tape is pulled out from a conventional adhesive reel. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant explanations are omitted. Also, for convenience of the drawings, the dimensional ratios in the drawings do not necessarily coincide with those in the description.

The adhesive reel 10 shown in Fig. 1 has a tubular winding core 1 and a pair of side plates 2 provided so as to face each other on both sides in the axial direction of the winding core 1. As shown in Fig. 2, an anisotropic conductive tape (adhesive tape) 5 is wound on the outer surface F1 of the winding core 1 to constitute a rolled body. The anisotropic conductive tape 5 is wound around the winding core 1 such that the surface of the base material 6 on which the adhesive layer is not formed faces the winding core 1 side and the adhesive layer 8 faces outward. The surface of the base material 6 on which the adhesive layer 8 is not formed is in direct contact with the adhesive layer 8 of the anisotropic conductive tape 5 inside the hank.

By winding the anisotropic conductive tape 5 on the winding core 1 in the above-described direction, when the anisotropic conductive tape 5 is pulled out, the adhesive layer 8 is peeled off from the base material 6, Can be suppressed at an extremely high level. It is preferable that the side plate is provided at both end portions in the axial direction of the winding core because it is easy to align and store a plurality of adhesive reels, but a side plate may be provided such that a part of the winding core penetrates the side plate and protrudes from the outer side of the side plate .

3, the side plate 2 is provided on the inner side surface F2 adjacent to the anisotropic conductive tape 5 and is provided with ribs 16b protruding from the surface F2 and extending radially from the rim of the through hole 2a, And a structure portion 2b. The provision of the rib structure portion 2b makes it possible to sufficiently reduce the area of the adhesive to be adhered to the side plate 2 even if the adhesive agent seeps from the end face of the anisotropic conductive tape 5, Blocking can be effectively suppressed.

1 and 2, the adhesive reel 10 has a shaft hole 10a into which a rotary shaft of a compression device (not shown) is inserted, and the shaft hole 10a is provided with a convex portion And a cut-out portion 10b to be fitted with the cut-out portion 10b. However, a structure other than the cutout 10b may be adopted as long as the adhesive reel 10 can be prevented from idling when the adhesive reel 10 is mounted on the rotary shaft of the compression bonding apparatus. As the reel parts including the winding core 1 and the side plate 2, a plastic molded article or the like can be used.

The anisotropic conductive tape 5 has a tape-like base material 6 and an adhesive layer 8 formed on one side of the base material 6 as shown in Fig.

The length of the anisotropic conductive tape 5 is preferably 1 to 1000 m, more preferably 200 to 1000 m, still more preferably 200 to 500 m, still more preferably 250 to 500 m, and particularly preferably 300 To 500 m. The length of the anisotropic conductive tape 5 that can be wound around the winding core 1 has been limited in the prior art because blocking is likely to occur. However, when the anisotropic conductive tape 5 is wound around the winding core 1, It is possible to wind the anisotropic conductive tape 5 longer than the conventional one on the winding core 1 by winding the anisotropic conductive tape 5 on the winding core 1.

The width of the anisotropic conductive tape 5 is preferably 0.5 to 30 mm, more preferably 0.5 to 3.0 mm, still more preferably 0.5 to 2.0 mm, and particularly preferably 0.5 to 1.0 mm. The width of the anisotropic conductive tape 5 that can be wound around the winding core 1 is limited. However, the anisotropic conductive tape 5 is wound around the winding core 1 so that the base 6 faces inward, The anisotropic conductive tape 5 having a width smaller than that of the conventional product can be wound around the winding core 1 by winding the anisotropic conductive tape 5 on the winding core 1. [ The width of the base material 6 is preferably equal to or greater than the width of the adhesive layer 8 formed thereon. The width of the adhesive layer 8 may be adjusted in accordance with the intended use.

The thickness of the adhesive layer 8 may be suitably selected in accordance with the kind of the adhesive component to be used and the type of the adherend, and is preferably 5 to 100 탆, more preferably 10 to 40 탆. The thickness of the adhesive layer 8 of the anisotropic conductive tape 5 that can be wound around the winding core 1 is limited. However, the anisotropic conductive tape 5 can be wound around the winding core 1, It is also possible to wind the anisotropic conductive tape 5 having the adhesive layer 8 thicker than the conventional product having a thickness of, for example, about 30 to 100 mu m by winding the insulating layer 5 on the winding core 1 . The thickness of the base material 6 is preferably about 4 to 200 mu m, more preferably 20 to 100 mu m.

The substrate 6 may be formed of, for example, polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, polybutylene terephthalate, polyolefin, polyacetate, polycarbonate, polyphenylene sulfide, polyamide, ethylene- , Polyvinyl chloride, polyvinylidene chloride, synthetic rubber, liquid crystal polymer and the like can be used. Naturally, the material constituting the base material 6 is not limited to these. It is also possible to use, as the base material 6, a surface subjected to mold-releasing treatment on the contact surface with the adhesive layer 8 or the like. Further, the film may be a mixture of two or more materials selected from the above-mentioned materials, or a film obtained by layering the film.

As the adhesive component 8a of the adhesive layer 8, a material showing curability by heat or light can be widely applied, and an epoxy adhesive or a radical curable adhesive can be used. Alternatively, a thermoplastic adhesive such as polyurethane or polyvinyl ester can be used. The use of a crosslinkable material is preferable since heat resistance and moisture resistance after connection are excellent. Among them, an epoxy adhesive containing a epoxy resin as a main component as a thermosetting resin is preferable because it can be cured for a short period of time and has good connection workability and excellent adhesion on the molecular structure. The radical curing type adhesive has characteristics such as excellent curing property at a lower temperature in a shorter time than an epoxy adhesive, and can be appropriately selected depending on the application.

The epoxy adhesive includes, for example, a thermosetting material such as an epoxy resin and a curing agent. Further, if necessary, a thermoplastic resin, a coupling agent, a filler and the like are generally compounded.

Examples of the epoxy resin include bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, phenol novolac epoxy resin, cresol novolak epoxy resin, bisphenol A novolac epoxy resin, bisphenol F Novolak type epoxy resins, alicyclic epoxy resins, glycidyl ester type epoxy resins, glycidylamine type epoxy resins, hydantoin type epoxy resins, isocyanurate type epoxy resins and aliphatic chain type epoxy resins. have. These epoxy resins may be halogenated or hydrogenated. Further, an acryloyl group or a methacryloyl group may be added to the side chain of the epoxy resin. These may be used singly or in combination of two or more.

The curing agent is not particularly limited as long as it can cure the epoxy resin, and examples thereof include an anionic polymerizable catalyst type curing agent, a cationic polymerizable catalyst type curing agent, and a middle part type curing agent. Of these, an anionic or cationic polymerizable catalyst type curing agent is preferable from the viewpoint of excellent fast curability and no consideration of chemical equivalent.

Examples of the anionic or cationic polymerizable catalyst type curing agent include imidazole compounds, hydrazide compounds, boron trifluoride-amine complexes, onium salts (aromatic sulfonium salts, aromatic diazonium salts and aliphatic sulfonium salts) , Diaminomaleonitrile, melamine and derivatives thereof, salts of polyamines, dicyandiamide, and the like, and modifications thereof. Examples of the curing agent of the above-mentioned mid part type include polyamines, polymercaptans, polyphenols, acid anhydrides and the like.

The latent curing agent obtained by microencapsulating the curing agent of the epoxy resin with a polymer material such as polyurethane or polyester, a metal thin film such as nickel or copper, or an inorganic material such as calcium silicate or the like can prolong the pot life, Do. These curing agents may be used alone or in combination of two or more.

The amount of the curing agent to be blended is generally about 0.05 to 20 parts by mass based on 100 parts by mass of the total amount of the thermosetting material and the thermoplastic resin to be blended as required.

The radical curing type adhesive includes, for example, a radical polymerizable material and a radical polymerization initiator. Further, if necessary, a thermoplastic resin, a coupling agent, a filler and the like are generally compounded.

As the radically polymerizable material, for example, a substance having a functional group capable of being polymerized by a radical can be used without particular limitation. Specifically, there may be mentioned, for example, acrylate (including corresponding methacrylate, hereinafter the same) compound, acryloxy (including corresponding methacryloxy, and hereinafter the same) compound, maleimide compound, And a radical polymerizable substance such as a styrene resin, a styrene resin, a styrene resin, a styrene resin, a styrene resin, a styrene resin, a styrene resin, These radical polymeric materials may be used in the form of monomers or oligomers, or monomers and oligomers may be used in combination.

Examples of the acrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, trimethylolpropane triacrylate, tetramethylol (Meth) acrylates such as methane tetraacrylate, 2-hydroxy-1,3-diacryloxypropane, 2,2-bis [4- (acryloxymethoxy) Ethoxy) phenyl] propane, dicyclopentenyl acrylate, tricyclodecanyl acrylate, tris (acryloyloxyethyl) isocyanurate, and urethane acrylate. If necessary, a polymerization inhibitor such as hydroquinone or methyl ether hydroquinone may be appropriately used. From the viewpoint of improvement in heat resistance, it is preferable that the radically polymerizable substance such as an acrylate compound has at least one substituent such as a dicyclopentenyl group, a tricyclodecanyl group, or a triazine ring.

As the radically polymerizable substance other than the acrylate compound, for example, the compound described in International Publication No. 2009/063827 can be suitably used. These may be used singly or in combination of two or more.

The radical polymerization initiator can be used without particular limitation, for example, as long as it is a compound capable of decomposing by heating or light irradiation to generate free radicals. Specific examples thereof include peroxide compounds and azo compounds. Such a curing agent is appropriately selected according to the intended connection temperature, connection time, port life, and the like.

More specific examples of the radical polymerization initiator include diacylperoxide, peroxydicarbonate, peroxyester, peroxyketal, dialkylperoxide, hydroperoxide, and silylperoxide. Of these, peroxyesters, dialkyl peroxides, hydroperoxides, silyl peroxides and the like are preferred, and peroxy esters with high reactivity are more preferred. As these radical polymerization initiators, it is possible to appropriately use the compounds described in, for example, International Publication No. 2009/063827. These may be used singly or in combination of two or more.

The blending amount of the radical polymerization initiator is generally about 0.1 to 10 parts by mass based on 100 parts by mass of the total amount of the radically polymerizable material and the thermoplastic resin optionally compounded.

These thermoplastic resins, which are blended with the epoxy-based adhesive and the radical-curable adhesive as needed, are such as to make it easier to impart film properties to the adhesive, for example. Examples of the thermoplastic resin include phenoxy resins, polyvinyl formal resins, polystyrene resins, polyvinyl butyral resins, polyester resins, polyamide resins, xylene resins, polyurethane resins, polyester urethane resins, Terpene phenol resin, and the like. These thermoplastic resins can be suitably used, for example, as described in International Publication No. 2009/063827. Of these, phenoxy resins are preferred because they are excellent in adhesiveness, compatibility, heat resistance, and mechanical strength. These may be used singly or in combination of two or more.

The blending amount of the thermoplastic resin is generally about 5 to 80 parts by mass with respect to 100 parts by mass of the total amount of the thermoplastic resin and the thermosetting material when it is blended in the epoxy adhesive. When a thermoplastic resin is blended in a radical-curable adhesive, the blending amount of the thermoplastic resin is generally about 5 to 80 parts by mass based on 100 parts by mass of the total amount of the thermoplastic resin and the radical polymerizable material.

By winding the anisotropic conductive tape 5 on the winding core 1 so that the base material 6 faces inward, it is possible to employ an adhesive which is relatively low in viscosity and which is likely to cause blocking in the prior art, to the adhesive layer Do. The adhesive layer 8 may have a shear viscosity of 100000 Pa 占 퐏 or less at 30 占 폚. The viscosity is more preferably 1000 to 50000 Pa 占 퐏, and still more preferably 1000 to 30000 Pa 占 퐏. Examples of the low viscosity adhesive component 8a include a thermosetting type adhesive and a low temperature curing type adhesive. Specific examples thereof include thermosetting curable adhesives containing a radical polymerization initiator having a half-life temperature for one minute of not higher than 160 占 폚. The one-minute half-life temperature is more preferably 60 to 140 占 폚, and still more preferably 60 to 120 占 폚. Examples of such a curing agent include di-tert-butyl peroxyhexahydroterephthalate (1-minute half-life temperature: 142 ° C, HAK-65W (trade name) manufactured by Kayaku Kabushiki Kaisha), substituted benzoyl peroxide [ (Manufactured by Nippon Oil & Fats Co., Ltd., Nippon BMT (trade name)) and dilauryl peroxide (1 minute half-life temperature: 116.4 ° C, Peruyol L (trade name), manufactured by Nippon Oil Co., Ltd.).

As another example of the low-viscosity adhesive component 8a, a thermosetting resin, a radically polymerizable material containing a liquid radical polymeric substance at 30 占 폚, and a thermosetting curable adhesive containing a radical polymerization initiator. The content of the radically polymerizable substance in the thermosetting adhesive is preferably 20 to 80 parts by mass with respect to 100 parts by mass of the total amount of the thermoplastic resin and the radical polymerizable material. The content is more preferably 30 to 80 parts by mass, and still more preferably 40 to 80 parts by mass.

The adhesive component 8a may be an epoxy adhesive containing a thermosetting resin and a thermosetting material including a liquid epoxy resin at 30 占 폚 and a curing agent. In this case, the content of the epoxy resin in the epoxy adhesive is preferably 20 to 80 parts by mass with respect to 100 parts by mass of the total amount of the thermoplastic resin and the thermosetting material. The content is more preferably 40 to 80 parts by mass, and still more preferably 30 to 80 parts by mass.

In the case where the IC chip is mounted on a glass substrate or a flexible printed substrate (FPC), a component exhibiting a relaxation action of internal stress is preferably used from the viewpoint of suppressing warpage of the substrate generated from the difference in coefficient of linear expansion between the IC chip and the substrate It is preferable to add it to the adhesive component. Concretely, it is preferable to blend an acrylic rubber or an elastomer component with the adhesive component. Radical curing adhesives such as those described in WO 98/44067 can also be used.

Examples of the conductive particles 8b include metal particles such as Au, Ag, Ni, Cu, and solder, carbon, and the like. It is also possible to use a non-conductive glass, ceramics, plastic, or the like as a nucleus, and coating the nucleus with the above-mentioned metal or carbon film or metal particles. If the conductive particles 8b are conductive particles or hot molten metal particles made of plastic as a nucleus, they will have deformability at the time of heating and pressing. This makes it possible to increase the contact area between the electrode and the conductive particles 8b at the time of connection, thereby improving connection reliability.

Further, insulating particles coated with a polymer resin or the like may be further added to the surface of the conductive particles 8b. By adding the insulating particles, it is possible to suppress a short circuit due to contact between the particles when used as an anisotropic conductive tape, and to improve the insulation between adjacent circuit electrodes when the blending amount of the whole particles is increased. Further, one kind of particles selected from insulating particles and conductive particles may be used alone or in combination of two kinds of particles. The average particle diameter of the conductive particles and the insulating particles is preferably 1 to 18 占 퐉, more preferably 2.5 to 10 占 퐉, from the viewpoint of improving dispersibility and conductivity.

The blending amount of the conductive particles 8b is not particularly limited and is preferably 0.1 to 30% by volume, more preferably 0.1 to 10% by volume, still more preferably 0.5 to 5% by volume, %to be. When the amount of the conductive particles 8b is less than 0.1% by volume, excellent conductivity tends to be impaired. When the amount of the conductive particles 8b is more than 30% by volume, the circuit tends to be short-circuited when used as an anisotropic conductive tape.

In order to lower the fluidity of the adhesive layer 8, an inorganic filler may be added to the adhesive component 8a. The inorganic filler is not particularly limited as long as it is an inorganic compound in the form of solid particles, for example. Specific examples of the material of the inorganic filler include aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, alumina, aluminum nitride, aluminum whisker, boron nitride, Silica such as amorphous silica, and antimony oxide. The inorganic fillers may be used singly or in combination of two or more kinds.

In the present embodiment, the anisotropic conductive tape 5 is wound around the winding core 1 so that the base material 6 faces the winding core side (inside side), so that an inorganic filler is not added to the adhesive layer 8 , Or even when the blending amount is set to 20% by volume or less based on the volume of the adhesive layer 8, the blocking can be sufficiently suppressed. The inorganic filler content is more preferably 0 to 15% by volume, and more preferably 0 to 10% by volume.

Further, even if the content of the inorganic filler based on the mass of the adhesive layer 8 is 50 mass% or less, blocking can be sufficiently suppressed. The inorganic filler content is more preferably 0 to 40 mass%, and more preferably 0 to 30 mass%. Since the specific gravity of the inorganic filler differs depending on the kind thereof, it is preferable to set the content on a mass basis to an appropriate value according to the inorganic filler to be used. For example, when the inorganic filler is silica, even if the content based on the mass of the adhesive layer 8 is 35 mass% or less, blocking can be sufficiently suppressed. The content of silica is more preferably from 0 to 30 mass%, and still more preferably from 0 to 20 mass%. When the inorganic filler is alumina, blocking can be sufficiently suppressed even if the content based on the mass of the adhesive layer 8 is 50 mass% or less. The alumina content is more preferably 0 to 40 mass%, and further preferably 0 to 30 mass%.

The content of the inorganic filler can be easily calculated at the time of compounding. In the case of measuring from the state of the adhesive tape, the content can be measured by the following method, for example.

(1) The crucible used for the measurement is placed in an electric furnace (in an air environment) heated to 700 ° C in advance, and then heated for 45 minutes.

(2) The temperature of the electric furnace is returned to room temperature, and the mass of the crucible extracted from the electric furnace is quickly weighed in a desiccator. Further, in the measurement of the content of the inorganic filler, the mass of the crucible is measured up to three decimal places (0.001 g) using a balance (precision electronic balance UW series manufactured by Shimadzu Corporation).

(3) Put a crucible on the balance and put about 1 g of the adhesive layer from the adhesive tape in the crucible. The weighing is carried out at 23 ± 3 ° C, 50 ± 10% RH and 1 atm.

(4) The crucible containing the adhesive layer is heated in an electric furnace for 45 minutes in the same manner as in (1). By this heating, the adhesive layer becomes ash.

(5) The temperature of the electric furnace is returned to room temperature, and the mass of the crucible and the ash taken from the electric furnace is rapidly weighed in a desiccator in the same manner as in (2) and (3) above.

(6) The mass of the crucible obtained in (2) is subtracted from the mass of the crucible and ash obtained in (5), and the mass of the ash is calculated. This ash will contain inorganic filler and conductive particles (metal powder).

(7) The kind and content of the conductive particles (metal powder) contained in the ash are separately calculated by ICP emission spectroscopy. At this time, the ash is decomposed with a mixed acid of hydrofluoric acid and nitric acid to prepare a test solution. The metal species contained in the test solution and its content are quantitatively analyzed by an ICP emission spectrochemical analyzer (ICP-AES manufactured by Shimadzu Corporation). The mixed acid is a mixture of hydrofluoric acid, nitric acid and water in a mass ratio of 1: 1: 1. The mass of the conductive particles (metal fractions) calculated by the ICP emission spectroscopic analysis method is subtracted from the mass of the ash obtained in the above (6) to obtain the mass of the inorganic filler.

(8) The content of the inorganic filler based on the volume is obtained as follows. That is, the specific gravity of the ash taken out from the crucible and the specific gravity of the adhesive layer before heating were measured with a dry specific gravity meter (Shimatsu Kogyo Denshi Accupile II 1340 Series), and theoretical specific gravity of the metal detected by ICP emission spectroscopy The content is subtracted from the ash, and the volume percentage of the inorganic filler to the original adhesive layer is calculated.

In order to manufacture the adhesive reel 10, for example, a coating solution containing an adhesive component may be applied on a base film (various materials described above as a base material, for example, a polyethylene terephthalate film) And the master disk of the anisotropic conductive film is produced. This disc is cut into a tape shape so as to have a width suitable for the application. For example, a slit device described in Japanese Patent Application Laid-Open No. 2003-285293 can be used for this cutting. The adhesive reel 10 is produced by winding the anisotropic conductive tape 5 having a predetermined width on the winding core of the reel part. At this time, in the present embodiment, the anisotropic conductive tape 5 is wound around the winding core 1 so that the base material 6 faces the winding core 1 side and the adhesive layer 8 faces the outside.

In the present invention, in order to wind the anisotropic conductive tape on the winding core of the reel part, it is preferable that the first part of the anisotropic conductive tape (the part at the beginning of winding) is fixed to the winding core and wound. This fixing method can be carried out by well-known methods, but it can be fixed by, for example, an adhesive tape or an adhesive. It is also possible to fix and fix the winding core or the cutting part on the winding core. Among them, it is preferable to use an adhesive tape or a pressure-sensitive adhesive from the viewpoint of workability.

In order to prevent the adhesive layer 8 from being exposed to the outer periphery of the rolled body of the anisotropic conductive tape 5 and to prevent the portion from being contaminated with dust or the like, the following countermeasures may be taken if necessary. For example, the adhesive layer 8 on the base material 6 is previously removed from the last part (winding end portion) of the anisotropic conductive tape 5 to form a margin portion, (8) can be prevented from being exposed. Alternatively, instead of forming the margin portion in the substrate 6, another tape (which may be the same as the substrate) may be prepared, and this tape may be wound around the end of the substrate 6 and wound around the core. In addition to the above, the adhesive reel 10 can be stored in a pocket to prevent contamination from the external environment.

(Circuit connecting body)

Next, a circuit connector manufactured by using the adhesive layer 8 of the adhesive reel 10 according to the present embodiment as a circuit connecting material will be described. 5 includes a first circuit member 30 and a second circuit member 40 which are opposed to each other and the first circuit member 30 and the second circuit member 40, A connecting portion 50a for connecting them is provided.

The first circuit member 30 has a circuit board 31 and a circuit electrode 32 formed on the main surface 31a of the circuit board 31. [ The second circuit member 40 has a circuit board 41 and a circuit electrode 42 formed on the main surface 41a of the circuit board 41. [

Specific examples of the circuit member include chip parts such as semiconductor chips (IC chips), resistor chips, condenser chips, and the like. These circuit members are generally provided with circuit electrodes and have a plurality of (at least two or more) circuit electrodes. Specific examples of the other circuit member to which the circuit member is connected include a flexible substrate having a metal wiring, a flexible printed wiring board, and a wiring substrate such as a glass substrate on which indium tin oxide (ITO) is deposited. By using the anisotropic conductive tape 5 pulled out from the adhesive reel 10, the circuit members can be efficiently connected with high connection reliability. Therefore, the anisotropic conductive tape 5 according to the present embodiment is suitable for COG packaging (Chip On Glass) or COF packaging (Chip On Flex) on a wiring board of a chip component having a plurality of fine connection terminals (circuit electrodes) Do.

The surface of each of the circuit electrodes 32 and 42 may be composed of one kind selected from gold, silver, tin, ruthenium, rhodium, palladium, osmium, iridium, platinum and indium tin oxide (ITO) . The material of the surface of the circuit electrodes 32 and 42 may be the same or different for all the circuit electrodes.

The connection portion 50a includes a cured product 8A of an adhesive component 8a contained in the adhesive layer 8 and conductive particles 8b dispersed therein. In the circuit connecting member 100, the opposing circuit electrodes 32 and the circuit electrodes 42 are electrically connected through the conductive particles 8b. That is, the conductive particles 8b are in direct contact with both the circuit electrodes 32 and 42.

As a result, the connection resistance between the circuit electrodes 32 and 42 is sufficiently reduced, and good electrical connection between the circuit electrodes 32 and 42 becomes possible. On the other hand, the cured product 8A has electrical insulation, and insulation between adjacent circuit electrodes is ensured. Therefore, it is possible to smoothly flow the current between the circuit electrodes 32 and 42, and the function of the circuit can be sufficiently exhibited.

(Method of manufacturing circuit connecting body)

Next, a method of manufacturing the circuit connecting member 100 will be described. Fig. 6 is a process diagram showing an embodiment of a method of manufacturing a circuit connector by a schematic sectional view. Fig. In the present embodiment, the adhesive layer 8 of the anisotropic conductive tape 5 is thermally cured to finally manufacture the circuit connecting member 100. [

First, the adhesive reel 10 is mounted on the rotating shaft of a connecting device (not shown). The anisotropic conductive tape 5 is drawn out from the adhesive reel 10 with the adhesive layer 8 directed downward. The anisotropic conductive tape 5 is cut to a predetermined length and is mounted on the main surface 31a of the circuit member 30 (Fig. 6 (a)).

Next, the adhesive layer 8 is pressed against the first circuit member 30 by pressing in the directions of arrows A and B in Fig. 6A (Fig. 6B). The pressure at this time is not particularly limited as long as it does not damage the circuit member, but it is generally preferably 0.1 to 30.0 MPa. The heating temperature may be set at a temperature at which the adhesive layer 8 is not substantially cured. The heating temperature is preferably 50 to 100 占 폚. These heating and pressurization are preferably performed in a range of 0.1 to 2 seconds.

After the base material 6 is peeled off, the second circuit member 40 is placed so that the second circuit electrode 42 faces the first circuit member 30 side as shown in Fig. 6 (c) And is mounted on the adhesive layer (8). Then, while heating the adhesive layer 8, the whole is pressed in the directions of arrows A and B in Fig. 6 (c). The heating temperature at this time is set to a temperature at which the adhesive component 8a of the adhesive layer 8 can be cured. The heating temperature is preferably 60 to 180 占 폚, more preferably 70 to 170 占 폚, and even more preferably 80 to 160 占 폚. If the heating temperature is lower than 60 ° C, the curing rate tends to decrease. If the heating temperature is higher than 180 ° C, unwanted side reactions tend to proceed. The heating time is preferably 0.1 to 180 seconds, more preferably 0.5 to 180 seconds, further preferably 1 to 180 seconds.

The connecting portion 50a is formed by the curing of the adhesive component 8a, and the circuit connecting member 100 as shown in Fig. 5 is obtained. The conditions of the connection are appropriately selected according to the application to be used, the adhesive component, and the circuit member. When the adhesive layer 8 is cured by light, the adhesive layer 8 may be irradiated with an actinic ray or an energy ray as appropriate. Examples of the active rays include ultraviolet rays, visible rays, and infrared rays. Examples of the energy ray include an electron beam, an x-ray, a gamma ray, and a microwave.

According to the present embodiment, the anisotropic conductive tape 5 is wound around the winding core 1 so that the base material 6 faces the winding core side (inside), whereby the anisotropic conductive tape 5 wound around the reel part It is possible to suppress the peeling of the adhesive layer 8 from the base material 6 at an extremely high level during drawing.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. The present invention can be variously modified without departing from the gist of the present invention.

For example, in the above embodiment, the anisotropic conductive tape 5 is exemplified as the adhesive tape for circuit connection. However, the adhesive layer 8 may be made of a non-conductive material containing the adhesive component 8a and containing no conductive particles 8b A tape may be wound around the winding core 1 to produce an adhesive reel or a conductive tape having no anisotropy and containing more conductive particles 8b than the anisotropic conductive tape may be used. It is also applicable to adhesive films for various electronic materials such as die bond films, silver films, and adhesive films for semiconductor wafer processing. In the above embodiment, the side plate 2 having the rib structure portion 2b is exemplified, but a side plate having no rib structure portion 2b may be used instead (see Fig. 7). Since the side plate not having such a rib structure portion tends to cause blocking more than the side plate having the rib structure portion described above, the blocking can be sufficiently suppressed by applying the present invention.

In the above embodiment, the case where the adhesive layer 8 is composed of one layer is exemplified, but a plurality of layers may be provided on the base material 6. [ For example, the adhesive tape 15A shown in Fig. 8A has an adhesive layer 18 of a multilayer structure. The adhesive layer 18 is composed of a conductive particle-free layer 18a containing no conductive particles and a conductive particle-containing layer 18b containing conductive particles. As the adhesive component of the conductive particle-free layer 18a and the conductive particle-containing layer 18b, the same adhesive component as the adhesive layer 8 described above can be used.

When the above-described two-layered adhesive layer 18 is used as the circuit connecting material, it is possible to sufficiently suppress the reduction in the number of conductive particles on the circuit electrode due to the flow of the adhesive component have. Therefore, when the IC chip is connected to the substrate by COG mounting or COF mounting, for example, the number of conductive particles on the metal bump of the IC chip can be sufficiently secured. In this case, the adhesive layer 18 is disposed so that the surface having the metal bumps of the IC chip and the conductive particle-free layer 18a are in contact with the conductive particle-containing layer 18b on the other hand, .

The adhesive tape 15B shown in Fig. 8B is provided with a pressure-sensitive adhesive layer 9a between the substrate 6 and the adhesive layer 8 from the viewpoint of preventing the peeling of the adhesive layer 8 more reliably It is. The adhesive tape 15C shown in Fig. 8C is obtained by further laminating the pressure-sensitive adhesive layer 9b on the adhesive layer 8 from the viewpoint of improving the adhesion to the circuit member.

[Example]

Hereinafter, the present invention will be described in more detail in Examples, but the present invention is not limited thereto.

(Embodiment 1)

[Preparation of raw materials of adhesive ingredients]

To prepare the adhesive component, the following raw materials were prepared.

50 g of a thermoplastic phenoxy resin (trade name: PKHC, product of Union Carbide Corporation, weight average molecular weight: 45000) was mixed with toluene (boiling point 110.6 캜) and ethyl acetate (boiling point 77.1 캜) at a ratio of 1: 1 And dissolved in a solvent to prepare a phenoxy resin solution having a solid content of 40% by mass.

(UA-512, weight average molecular weight: 2800, manufactured by Shin-Nakamura Kagaku Kogyo Co., Ltd.) liquid phase at 30 占 폚 and dimethacrylate liquid phase at 30 占 폚 (Trade name: DCP, weight average molecular weight: 332, manufactured by High Kyo Kagaku Co., Ltd.).

As a curing agent (radical generator) for generating free radicals, dilauroyl peroxide (manufactured by Nihon Shuzo Co., Ltd., product name: PEROIL L, 1 minute half life temperature: 116.4 DEG C, weight average molecular weight: 399) was prepared.

[Production of adhesive film]

Using the raw materials prepared as described above, an adhesive film was produced as follows.

40 parts by mass of liquid urethane acrylate, 20 parts by mass of liquid dimethacrylate and 4 parts by mass of a radical generator were mixed with 40 parts by mass of the phenoxy resin solution to obtain a mixed solution. A nickel (powder) particle having an average particle diameter of 5 占 퐉 (conductive particle) and a silica powder having an average particle diameter of 0.5 占 퐉 (inorganic filler) were blended with the mixed solution to obtain a coating liquid in which nickel powder and silica powder were dispersed in the mixture.

The coating liquid was applied to a PET film (carrier film) having a thickness of 80 占 퐉 and a width of 500 占 퐉 on both surfaces of which had been subjected to a silicon release treatment to a length of 320 m by using a coating and spreading apparatus and a drying furnace having a furnace length of 15 m and a hot air temperature of 70 占 폚 Drying was carried out at a rate of 3 m / min. Thus, an adhesive film (total length 320 m) provided with an adhesive layer (thickness: 40 m) on one side of the PET film was obtained.

The content of nickel in the adhesive layer after drying was 1.5% by volume and the content of silica was 15% by volume (26% by mass).

[Measurement of Shear Viscosity]

An adhesive layer having a thickness of about 0.6 mm was prepared by laminating 15 sheets of the adhesive layer (thickness: 40 占 퐉) of the adhesive film, and the shear viscosity of the adhesive layer was measured using a sample cut into a size of 1 cm x 1 cm . For this measurement, a shear viscoelasticity measuring apparatus (trade name: ARES, manufactured by TA Instruments) was used. As a result, the adhesive layer had a shear viscosity of 20,000 Pa 占 퐏 at 30 占 폚. Measurement conditions were as follows.

Measuring frequency: 10Hz,

Atmosphere: nitrogen,

Temperature range: 0 ° C to 150 ° C,

A rate of temperature increase: 10 占 폚 / min,

Probe diameter: 8 mm,

Sample size: 10 mm x 10 mm,

Sample thickness: about 0.6 mm,

Measured strain: 1.0%

[Production of adhesive reel]

The adhesive film was cut to a width of 1.5 mm by a roll-to-roll slit apparatus, and an adhesive tape was wound on a reel part (winding core outer diameter: 66 mm, plastic molded article) with a length of 300 m. At this time, the base made of PET was wound toward the winding core side (inside) and the adhesive layer was wound outward. A reel shroud (thickness: 2.0 mm) was provided on both sides of the winding core, and clearance distances between the reel side plate and the adhesive tape were in the range of about 0.1 mm to 0.5 mm on each side. In the present embodiment, a reel part having a reel side plate provided with a radially extending rib structure part 2b as shown in Fig. 1 is used. However, a radially extending rib structure part as shown in Fig. 7 The effect of the present invention can be obtained even if a reel component having a reel side plate that is not installed is used.

[Evaluation on the presence or absence of peeling of the adhesive layer]

The adhesive reel was allowed to stand in a thermostatic chamber at 35 DEG C for 24 hours while standing vertically, and then the lateral state was observed with a microscope. As a result, it was confirmed that the adhesive seeping from the side surface of the rolled body was dot-bonded to the reel side plate. Next, this adhesive reel was subjected to an ejection test with a total length of 300 m at a speed of 1 m per second, and no defective peeling of the adhesive layer from the substrate occurred once.

(Second Embodiment)

[Preparation of raw materials of adhesive ingredients]

To prepare the adhesive component, the following raw materials were prepared.

50 g of a thermoplastic phenoxy resin (trade name: PKHC, product of Union Carbide Corporation, weight average molecular weight: 45000) was mixed with toluene (boiling point 110.6 캜) and ethyl acetate (boiling point 77.1 캜) at a ratio of 1: 1 And dissolved in a solvent to prepare a phenoxy resin solution having a solid content of 40% by mass.

(Trade name: YL980 epoxy equivalent: 180 to 190), which is a liquid epoxy resin at 30 占 폚, and an epoxy resin (trade name: 1032H60, epoxy equivalence: 163 to 175) were prepared.

As an epoxy resin curing agent, an aromatic sulfonium salt (product name: SI-60, manufactured by SANSHIN KAGAKU KOGYO CO., LTD.) Was prepared.

[Production of adhesive film]

Using the raw materials prepared as described above, an adhesive film was produced as follows.

60 parts by mass of an epoxy resin YL-980 which is liquid at 30 占 폚 was added to 35 parts by mass of the phenoxy resin solution, 5 parts by mass of an epoxy resin 1032H60 solid at 30 占 폚 and 4 parts by mass of a curing agent SI-60 were mixed, . A nickel fraction having an average particle diameter of 5 占 퐉 and a silica fraction having an average particle diameter of 0.5 占 퐉 were mixed with the mixed solution to obtain a coating liquid in which the nickel fraction and the silica fraction were dispersed in the mixture.

The coating liquid was applied to a PET film having a thickness of 80 占 퐉 and a width of 500 占 퐉 on both sides with a silicone release treatment using a coating device at a length of 320 m and dried at a rate of 3 m / Min. ≪ / RTI > Thus, an adhesive film (total length 320 m) provided with an adhesive layer (thickness: 40 m) on one side of the PET film was obtained.

The content of nickel in the adhesive layer after drying was 1.5% by volume and the content of silica was 15% by volume (26% by mass).

[Measurement of Shear Viscosity]

The shear viscosity of the adhesive film was measured in the same manner as in Example 1, and as a result, the shear viscosity of the adhesive layer at 30 캜 was 10000 Pa 占 퐏.

[Production of adhesive reel]

The adhesive film was cut in the same manner as in Example 1, and the tape was wound on a reel part (plastic molded article) so that the base material of the obtained adhesive tape was directed toward the winding core side (inside) and the adhesive layer was directed to the outside. Thus, an adhesive material reel in which an adhesive tape having a width of 1.5 mm and a length of 300 m was wound was obtained. The clearance distance between the reel side plate and the rolled body of the adhesive tape was within the range of about 0.1 mm to 0.5 mm on each side.

[Evaluation on the presence or absence of peeling of the adhesive layer]

The adhesive reel was allowed to stand in a thermostat at 35 DEG C for 24 hours while standing vertically, and then the state of the side surface was observed with a microscope. As a result, it was confirmed that the adhesive seeping from the side surface of the rolled body was dot-bonded to the reel side plate. Next, this adhesive reel was subjected to an ejection test with a total length of 300 m at a speed of 1 m per second, and no defective peeling of the adhesive layer from the substrate occurred once.

(Third Embodiment)

First, an adhesive material reel was produced in the same manner as in the first embodiment. In the same manner as in the first embodiment, except that a weight of 50 g was attached to the tip of the adhesive tape to make the adhesive easily leak out by the side surface of the roll, And allowed to stand for 24 hours. Thereafter, the state of the side surface was observed with a microscope. As a result, it was confirmed that an adhesive leaking from the side surface of the rolled body was dug-bonded to the reel side plate. Next, this adhesive reel was subjected to an ejection test with a total length of 300 m at a speed of 1 m per second, and no defective peeling of the adhesive layer from the substrate occurred once.

(Fourth Embodiment)

A weight of 50 g was provided at the tip of the adhesive tape in the same manner as in Example 3 except that the adhesive reel produced in the same manner as in Example 2 was used in place of the adhesive reel produced in the same manner as in Example 1, Was left in a thermostatic chamber. Thereafter, the state of the side surface was observed with a microscope. As a result, it was confirmed that an adhesive leaking from the side surface of the rolled body was dug-bonded to the reel side plate. Next, the adhesive reel was subjected to a release test with a total length of 300 m at a speed of 1 m per second, and no defect that the adhesive layer was peeled from the substrate occurred once.

(Fifth Embodiment)

The adhesive reel produced in the same manner as in Example 1 was left in the thermostatic chamber in the same manner as in Example 1 except that the temperature of the thermostatic chamber was set at 40 占 폚 instead of 35 占 폚. Thereafter, the state of the side surface was observed with a microscope. As a result, it was confirmed that an adhesive leaking from the side surface of the rolled body was dug-bonded to the reel side plate. Next, this adhesive reel was subjected to an ejection test with a total length of 300 m at a speed of 1 m per second, and no defective peeling of the adhesive layer from the substrate occurred once.

(Comparative Example 1)

An adhesive reel was produced in the same manner as in Example 1 except that the base material was wound on the winding core such that the adhesive tape was wound on the winding core so as to face the outer side of the winding core (inner side) And allowed to stand for 24 hours in a stationary state. Thereafter, the state of the side surface was observed with a microscope. As a result, it was confirmed that an adhesive leaking from the side surface of the rolled body was dug-bonded to the reel side plate. Next, the adhesive reel was subjected to an ejection test with a total length of 300 m at a speed of 1 m per second, and the defective peeling of the adhesive layer from the substrate occurred 15 times.

(Comparative Example 2)

An adhesive reel was produced in the same manner as in Example 2 except that the base material was wound on the winding core so that the adhesive tape was wound on the winding core so as to face the outer side of the winding core (inner side) And allowed to stand for 24 hours in a stationary state. Thereafter, the state of the side surface was observed with a microscope. As a result, it was confirmed that an adhesive leaking from the side surface of the rolled body was dug-bonded to the reel side plate. Next, this adhesive reel was subjected to an unwinding test with a total length of 300 m at a speed of 1 m per second, and the failure of peeling the adhesive layer from the substrate occurred 17 times.

1: winding core
5: Anisotropic conductive tape (adhesive tape)
6: substrate
8, 18: adhesive layer
10: Adhesive reel
15A, 15B, 15C: adhesive tape

Claims (11)

A winding core,
A pair of side plates provided on both sides of the winding core so as to face each other,
1. An adhesive tape comprising a tape-like base material and an adhesive layer provided on one side thereof and having an adhesive tape wound around the winding core,
Wherein the adhesive layer contains a thermoplastic resin, a thermosetting material including a liquid epoxy resin at 30 占 폚, and an epoxy adhesive containing a curing agent, wherein the adhesive layer has a shear viscosity at 30 占 폚 of 100000 Pa 占 퐏 Or less,
Wherein the adhesive tape is used for circuit connection and is wound on the winding core so that the surface of the base material on which the adhesive layer is not formed faces the winding core side. The adhesive material reel according to claim 1, wherein the adhesive tape has a length of 200 m or more. delete The adhesive material according to claim 1, wherein the content of the epoxy resin in the epoxy adhesive is 20 to 80 parts by mass based on 100 parts by mass of the total amount of the thermoplastic resin and the thermosetting material. The adhesive reel according to any one of claims 1, 2, and 4, wherein the inorganic filler content of the adhesive layer is 20% by volume or less based on the volume of the adhesive layer. The adhesive reel according to any one of claims 1, 2, and 4, wherein the inorganic filler content of the adhesive layer is 50 mass% or less based on the mass of the adhesive layer. The adhesive reel according to claim 6, wherein the inorganic filler to be blended in the adhesive layer is silica and the content thereof is 35 mass% or less based on the mass of the adhesive layer. The adhesive reel according to claim 6, wherein the inorganic filler to be blended in the adhesive layer is alumina and the content thereof is 50 mass% or less based on the mass of the adhesive layer. The adhesive reel according to any one of claims 1, 2, and 4, wherein the adhesive tape has a width of 0.5 to 3.0 mm. The adhesive reel according to any one of claims 1, 2, and 4, wherein when the adhesive tape is used, the substrate is peeled off from the adhesive layer. The adhesive reel according to any one of claims 1, 2, and 4, wherein the adhesive tape is an anisotropic conductive tape.

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