JP2018053022A - Adhesive film wound body and method for producing adhesive film wound body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive tape wound body that can conform with various kinds of design changes of an adhesive film and can be provided in a short period of time.SOLUTION: An adhesive film wound body comprises a reel core 3 around which an adhesive film 2 is wound and a film roll 4 of the adhesive film 2 wound around the reel core 3. The reel core 3 is provided with no flange and a support 5 is attached to a side face of the film roll 4.SELECTED DRAWING: Figure 1

Description

  The present technology relates to an adhesive film winding body in which an adhesive film is wound around a reel, and a method for manufacturing the adhesive film winding body.

  Conventionally, an anisotropic conductive film (ACF) has been used as an adhesive film for electrically connecting electronic components such as a glass substrate of a liquid crystal panel and an IC chip. This anisotropic conductive film includes, for example, a case where terminals of electronic components such as an IC chip, an LSI chip, and a flexible printed circuit board (FPC) are connected to an electrode formed on a glass substrate or an insulating substrate. It is used when various terminals are bonded and electrically connected.

  As the anisotropic conductive film, generally used is an epoxy resin-based insulating adhesive in which conductive particles are dispersed. For example, between an IC chip terminal and an ITO electrode on a glass substrate, When the conductive particles are sandwiched and crushed, the electrical connection between the IC chip and the ITO electrode is realized, and in this state, the adhesive is cured, so that the mechanical connection between the IC chip and the ITO electrode is achieved. It has been realized.

  Such an adhesive film is usually a reel in which a binder resin layer (adhesive layer) containing conductive particles is formed on a base film as a base material, and a release film is laminated on the binder resin layer. Shipped in the form of an adhesive film wound body wound around a member in a roll shape. At the time of use, after being unwound from the reel member and cut to a required length, it is used for connection of electronic components.

JP 2013-220824 A JP 2003-342537 A

  In general, the adhesive film is wound around a flanged reel member in order to prevent winding deviation at the time of shipment, transportation, unwinding in actual use, or the like. This reel member with flange is designed and manufactured according to the width and length of the wound adhesive film.

  In recent years, electronic parts using adhesive films have been miniaturized and diversified, and adhesive films having various widths and lengths have been demanded. However, depending on the width and length of the adhesive film, it is necessary to appropriately design various sizes of flanged reel members having different winding widths and winding lengths. Man-hours and costs were required, and the required adhesive film winding body could not be provided in a short time. This also affects the examination of mass production of manufactured products using adhesive films.

  On the other hand, in recent years, it has become easy to improve the connection device, and from the viewpoint of environmental considerations (reduction of plastic materials), there are some users whose flanges are not an essential component. Therefore, there is a demand for an adhesive film winding body that can prevent excessive winding deviation at any width and film length without providing a flange. In particular, a narrow adhesive film winding body is strongly demanded.

  In addition, as a structure of the adhesive film winding body which does not provide a flange, there exists the method of hanging in the air using a member larger than a flange, but since the volume of a product becomes large too much, it is not suitable (patent document 1).

  In addition, there is a method of processing the side surface itself of the adhesive film winding body by application, etc., but in the case of a narrow adhesive film, it is obtained by winding after the slit, so that processing the entire side surface for each product, This causes an increase in cost (Patent Document 2).

  Then, this technique aims at providing the adhesive tape winding body which can respond to the various design changes of an adhesive film, and can provide in a short period of time, and the manufacturing method of an adhesive tape winding body.

  In order to solve the above-described problem, an adhesive film winding body according to the present technology is a reel core and an adhesive film wound around the reel core, and a support is provided on a side surface of a film roll formed by winding the adhesive film. Is affixed.

  Moreover, the manufacturing method of the adhesive film winding body according to the present technology includes a step of winding an adhesive film around a reel core, and a step of attaching a support to a side surface of a film roll made of the adhesive film wound around the reel core. It has.

  According to the present technology, since the adhesive film winding body does not have a flange on the reel core, the adhesive film of any size can be wound without being influenced by the width and length of the adhesive film, and the film roll By attaching a support to the side surface of the sheet, winding deviation and collapse can be prevented. Therefore, according to the present technology, it is possible to provide an adhesive film winding body that can easily and quickly respond to changes in the width and length of the adhesive film.

FIG. 1 is an external perspective view showing an adhesive film winding body to which the present technology is applied. FIG. 2A is a front view of a reel core used in an adhesive film winding body to which the present technology is applied, and FIG. 2B is a front view of the adhesive film winding body to which the present technology is applied. FIG. 3 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 4 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 5 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 6 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 7 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 8 is a front view showing an example of an adhesive film winding body to which the present technology is applied. FIG. 9A is a front view showing one surface of an adhesive film winding body in which a support is attached symmetrically to both surfaces of the film roll, and FIG. 9A is a rear view showing the other surface. FIG. 10 (A) is a front view showing one surface of an adhesive film winding body in which a support is asymmetrically attached to both surfaces of a film roll, and FIG. 10 (A) is a rear view showing the other surface. FIG. 11A is a cross-sectional view of an adhesive film winding body in which a single long support is stuck through the outermost peripheral surface of the film roll when a tape-like support is stuck on both sides of the film roll. FIG. 11B is a cross-sectional view of an adhesive film winding body in which one long support is stuck through the shaft hole of the reel core when the tape-like support is stuck on both surfaces of the film roll. 12A and 12B are front views of an adhesive film winding body to which a sheet-like support is attached. FIG. 13: is sectional drawing which shows the location where the support body of the film roll was stuck. FIG. 14A is a cross-sectional view showing a configuration of an anisotropic conductive film, and FIG. 14B shows a configuration of an anisotropic conductive film in which a conductive particle-containing layer and an insulating adhesive layer are laminated. It is sectional drawing.

  Hereinafter, an adhesive film winding body to which the present technology is applied and a method for manufacturing the adhesive film winding body will be described in detail with reference to the drawings. In addition, this technique is not limited only to the following embodiment, Of course, a various change is possible in the range which does not deviate from the summary of this technique. Further, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Adhesive film roll]
As shown in FIG. 1, an adhesive film winding body 1 to which the present technology is applied includes a reel core 3 around which an adhesive film 2 is wound, and a film roll 4 of the adhesive film 2 wound around the reel core 3. The support 5 is attached to the side surface of the film roll 4.

  The adhesive film winding body 1 has a film roll 4 of the adhesive film 2 formed by winding the adhesive film 2 around the reel core 3 for a predetermined length, and a support body via an adhesive on the side surface of the film roll 4. It is manufactured by sticking 4. In this state, the adhesive film winding body 1 is sealed, packed, and shipped by vacuum packing on a transparent film. At the time of use, the support 5 is peeled off from the side surface of the film roll 4 when the electronic component is attached to the connection device or after being attached to the connection device, and the support 5 is sequentially unwound according to the use length.

  In addition, the adhesive film winding body 1 may unwind an adhesive film in the state in which the support body 5 was stuck on the side surface of the film roll 4. In this case, the support 5 is naturally peeled off from the side surface of the film roll 4 as the connection film 2 is unwound.

  Hereinafter, the structure of the adhesive film winding body 1 is demonstrated.

[Reel core]
As shown in FIG. 2, the reel core 3 around which the adhesive film 2 is wound has a substantially cylindrical shape, and is penetrated or non-penetrated in which a rotating shaft is inserted at the center when the adhesive film 2 is wound or unwound. The shaft hole 3a is formed. The reel core 3 has a width wider than the width of the adhesive film 2, one end in the longitudinal direction of the adhesive film 2 is connected, and the adhesive film 2 is wound.

  The reel core 3 can be formed by molding or the like using various plastic materials or metal materials, for example. The reel core 3 is preferably a plastic material from the viewpoint of weight reduction and cost. The diameter of the reel core 3 around which the adhesive film 2 is wound is not particularly limited. However, if it is too large, the handling difficulty such as installation and transportation to the apparatus increases, and therefore it may be 50 cm or less, preferably 30 cm or less. preferable. This is because this size can be carried by one person.

  The reel core 3 to which the present technology is applied is not provided with a flange. The adhesive film winding body 1 is provided with a support 5 attached to the side surface of the film roll 4, thereby preventing winding deviation and having shape retention properties equivalent to those of an adhesive film winding body provided with a flange. .

  In addition, the reel core 3 may be provided with a projecting portion 3b that extends in the radial direction of the film roll 4 on both sides in the width direction of the outer peripheral surface around which the adhesive film 2 is wound to correct the winding position in the circumferential direction. By providing the overhang portion 3b, the reel core 3 can be wound with the adhesive film 2 approaching one side in the width direction of the outer peripheral surface when the reel core 3 has a width wider than the width of the adhesive film 2.

[Adhesive film]
As the adhesive film 2 wound around the reel core 3 and constituting the film roll 4, an anisotropic conductive film (ACF: used for COG mounting for mounting electronic components on a circuit board or the like, FOG mounting for connecting substrates to each other, and the like. Anisotropic Conductive Film), or a conductive adhesive film that connects an electrode of a solar cell and a tab wire. The configuration of the anisotropic conductive film 20 which is a specific example of the adhesive film 2 will be described in detail later.

[Film roll]
The film roll 4 is formed by winding the adhesive film 2 on the outer peripheral surface of the reel core 3 in a roll shape to a predetermined length, and the winding length is not particularly limited. In practical use, for example, the lower limit is preferably 10 m or more, and more preferably 30 m or more, from the viewpoint of economical efficiency due to continuous use. Further, the upper limit is preferably 600 m or less, and more preferably 500 m or less, from the viewpoint of protrusion and blocking prevention.

  Moreover, the film roll 4 is formed in a substantially disk shape having the thickness of the width of the adhesive film 2. The width is not limited in obtaining, but is preferably 5 cm or less, more preferably 1 cm or less, and even more preferably 5 mm or less. Moreover, it is preferable that it is 0.2 mm or more with the narrowing of the adhesive film 2, It is more preferable that it is 0.3 mm or more, It is still more preferable that it is 0.5 mm or more. And the support body 5 is stuck to the side surface of the film roll 4 via an adhesive agent or an adhesive. Thereby, the film roll 4 is prevented from being unwound by the adhesive film 2 and from being unrolled and detached from the lower adhesive film 2.

[Support]
The material of the support 5 is not particularly limited, but a material having a strength that can prevent the film roll 4 from being wound or collapsed and a flexibility that can be easily applied to and peeled from the side surface of the film roll 4 is used. For example, a clean specification thread, a resin film such as PET or PI, a flexible metal plate, a piece of paper imparted with hardness, strength, flexibility, etc. by processing can be used. Further, the length and width of the support 5 can be designed as appropriate.

  The support 5 is affixed to the side surface of the film roll 4 via an adhesive, and is appropriately peeled from the side surface of the film roll 4 when the adhesive film wound body 1 is used. As an adhesive for sticking the support 5 to the side surface of the film roll 4, a known adhesive or pressure-sensitive adhesive can be used. Moreover, the adhesive agent which affixes the support body 5 to the side surface of the film roll 4 may have thermosetting property or photocurability.

  Since the adhesive film winding body 1 is not provided with a flange on the reel core 3, the adhesive film 2 of any size can be wound without being influenced by the width and length of the adhesive film 2, and the film roll 4. By winding the support on the side surface, it is possible to prevent winding deviation and collapse. Therefore, according to the present technology, it is possible to provide an adhesive film winding body that can easily and quickly respond to changes in the width and length of the adhesive film.

  In addition, as will be described later, the support 5 can prevent the winding displacement and the collapse by forming the adhesive layer 10 between the layers of the adhesive film 2 between the side surfaces of the film roll 4. . Further, when the support 5 is peeled from the side surface of the film roll 4, the adhesive layer 10 is also removed from the side surface of the film roll 4, thereby preventing blocking and smoothly unwinding the adhesive film 2. it can.

  In the adhesive film winding body 1, the support 5 is formed in, for example, a rectangular shape, and as shown in FIG. At this time, the support 5 may be radially attached to the side surface of the film roll 4. Moreover, the support body 5 may stick one elongate support body 5 over radial direction. Moreover, the adhesive film winding body 1 may affix the some support body 5 at equal intervals, and may affix it at unequal intervals.

  In addition, as for the adhesive film winding body 1, the structure which the support body 5 affixes can be set variously. For example, a configuration in which a plurality of short supports 5 are attached over the radial direction of the film roll 4 (FIG. 3), or a configuration in which a plurality of long supports 5 are applied in parallel over the radial direction of the film roll 4. (FIG. 4) Or the structure which affixes the short support body 5 over the radial direction of the film roll 4 to arbitrary positions, such as the reel core 3 side, the outer edge side of the film roll 4, or the middle of a radial direction (FIG. 5), Or the structure which sticks the short support body 5 in zigzag form over the radial direction of the film roll 4 (FIG. 6), or the structure which sticks the support body 5 non-parallel to the radial direction of the film roll 4 (FIG. 7). A configuration in which a corrugated support 5 (FIG. 8) or a non-linear support 5 such as a rectangular wave is attached is assumed.

  The support 5 may also be attached to the reel core 3. The adhesive film winding body 1 can be unwound by attaching a part of the support body 5 to the reel core 3 without peeling the support body 5 from the side surface of the film roll 4 when the adhesive film 2 is unwound. If it peels off with it, it will be supported by the reel core 3 and it can prevent that the support body 5 is scattered and conveyed with the adhesive film 2.

  Further, the support 5 may be attached only to one side surface of the film roll 4. Even if the support body 5 is affixed only to one side surface of the film roll 4, the adhesive film winding body 1 can prevent winding shift and collapse. Moreover, the adhesive film winding body 1 requires fewer man-hours for peeling off the support body 5 when used compared to the case where the support body 5 is attached to both surfaces.

  Further, when the adhesive film winding body 1 is attached to the connection device, the shaft hole 3a of the reel core 3 is inserted through the rotation shaft of the connection device. The support 5 is preferably attached to the side surface of the film roll 4 on the open end side of the rotating shaft when the adhesive film winding body 1 is mounted. Thereby, the adhesive film winding body 1 can peel the support body 5 easily after mounting | wearing with a connection apparatus, and also when not peeling, the support body 5 is connected to the connection apparatus with unwinding of the adhesive film 2. It can be made to peel outside, and it can prevent adhering to the mechanism in a connection apparatus, or being caught in the adhesive film 2 conveyed.

  The support 5 may be attached to one side and the other side of the film roll 4. The adhesive film winding body 1 can more reliably prevent winding displacement and collapse by attaching the support 5 to both surfaces of the film roll 4. Moreover, when the support body 5 is affixed on both surfaces of the film roll 4, when unwinding without peeling the support body 5, the resistance by adhesion | attachment of the support body 5 added to the film roll 4 is equivalent to both surfaces. The adhesive fill 2 can be stably unwound while acting and maintaining the balance of winding. Furthermore, since both surfaces of the film roll 4 are supported, packing can be performed regardless of which surface of the film roll 4 the load direction at the time of shipment and conveyance is, and the conveyance process can be simplified.

  Here, the adhesive film winding body 1 may affix the support body 5 to both surfaces of the film roll 4 symmetrically, or may affix it asymmetrically. For example, as shown in FIGS. 9A and 9B, the adhesive film winding body 1 has four support bodies 5 attached to one side surface 4a of the film roll 4 at intervals of 90 degrees in the radial direction. The other side surface 4b of the film roll 4 is also affixed in the same manner, and the support 5 affixed to the side surfaces 4a and 4b is asymmetrical, that is, affixed so as to face each other. Also, as shown in FIGS. 10A and 10B, the adhesive film winding body 1 was stuck to the four support bodies 5 stuck to one side face 4a of the film roll 4 and the other side face 4b. The four supports 5 may be shifted at an arbitrary angle, for example, 45 degrees in the circumferential direction.

  Moreover, you may affix so that each support body 5 of one side 4a and the other side 4b of the film roll 4 may overlap. By doing in this way, since the load concerning one side surface is received in a distributed manner on the other side surface, the effect of preventing winding deviation can be expected to be improved. Further, for the same reason, the support 5 on each of the one side surface 4a and the other side surface 4b of the film roll 4 may have a different shape and length in addition to the arrangement. Moreover, you may affix each support body 5 from which the shape and length differ as mentioned above so that the one part 4a and the other side surface 4b of the film roll 4 may overlap.

  Further, as shown in FIGS. 11A and 11B, the adhesive film winding body 1 has a single long support 5 when the tape-like support 5 is attached to both surfaces of the film roll 4. May be passed through the outermost peripheral surface of the film roll 4 and / or the shaft hole 3 a of the reel core 3. Thereby, the number of the support bodies 5 stuck on both side surfaces of the film roll 4 can be reduced, and the man-hour for sticking and peeling can be reduced. In this case, a notch may be provided in the shaft hole 3 a of the film roll 4 or the reel core 3 according to the size of the support 5.

  As shown in FIG. 2, the adhesive film winding body 1 has a length L of 80 in the radial direction (direction toward the center point of the film roll 4) at least from the outermost periphery of the film roll 4. It is preferable to affix in the area within%. In addition, the length L in the radial direction of the film roll 4 is a length from the outermost periphery of the film roll 4 toward the center point of the film roll 4 and refers to the length of the wound portion of the adhesive film 2 excluding the reel core. . Since the film roll 4 tends to cause winding displacement or collapse in a region within 80% of the radial length L of the film roll 4 in the radial direction from the outermost periphery of the film roll 4, the support is particularly provided in this region. By attaching 5, it is possible to effectively prevent winding deviation and collapse. The film roll 4 is wound as long as at least a part of the support 5 is attached to a region within 80% of the radial length L of the film roll 4 in the radial direction from the outermost periphery of the film roll 4. Misalignment and collapse can be prevented.

  Further, the adhesive film winding body 1 has a support 5 having a predetermined length from the outer edge of the reel core 3, for example, within 3 cm at least from the outer edge of the reel core 3 in the radial direction of the film roll 4 as shown in FIG. It may be attached to the area. Since the film roll 4 is likely to be wound or collapsed in a region close to the radial direction from the outer edge of the reel core 3, the support 5 is attached to this region, so that the winding shift or collapse is effectively performed. The effect which prevents can be expected.

  The cause of occurrence of winding misalignment or collapse varies depending on various conditions (width, thickness, length, viscosity of the binder resin layer, etc.) of the adhesive film 2 to be wound. There is no particular contradiction even when considering from the outermost periphery or from the outer edge of the reel core 3. Moreover, there is no particular problem even if these areas overlap.

[Sheet support]
Moreover, as shown to FIG. 12 (A) (B), the adhesive film winding body 1 may support the side surface of the film roll 4 extensively using the sheet-like support body 5. FIG. In this case, the sheet-like support 5 preferably covers 50% or more of the area of the side surface of the film roll 4. By using the sheet-like support 5 that covers the side surfaces of the film roll 4 extensively, it is possible to more effectively prevent winding displacement and collapse, and reduce the number of steps for attaching and peeling the support 5 to reduce man-hours. Can do. In addition, the support 5 may be a combination of a sheet-like one that covers a wide area and a smaller one. This is because, for example, the load generated during transportation and the load generated during use such as a drawer are greatly different. In this case, the support 5 that has become unnecessary may be peeled off depending on the situation. Note that the above is an example, and there is no particular limitation on the combination in which different sizes are used in combination.

  Moreover, the adhesive film winding body 1 can also use the sheet-like support body 5 which has a wide area as a product label. This eliminates the need for a separate labeling process, leading to reductions in man-hours and costs.

[Adhesive layer]
As described above, the support 5 is affixed to the side surface of the film roll 4 via an adhesive, and is appropriately peeled off from the side surface of the film roll 4 when the adhesive film wound body 1 is used. As the adhesive, a known thermosetting or photocurable adhesive or pressure-sensitive adhesive can be used. The adhesive may constitute an adhesive layer laminated on the support 5 by being previously applied to the support 5 and dried, or it may be configured in a paste and applied to the support 5 just before application. Also good.

  Further, the adhesive for connecting the support 5 to the film roll 4 is removed from the side surface of the film roll 4 together with the support 5 when the adhesive film winding body 1 is used, or is attached to the film roll 4. Since the adhesive film 2 is unwound, it is preferable that the adhesive strength after curing is relatively weak (for example, 0.1 to 0.4 N / mm in peel adhesive strength [JIS K6854]).

  The support 5 is attached to the film roll 4 via an adhesive, and is then heated and pressed by a thermocompression bonding tool to cure the adhesive and is attached to the side of the film roll 4. When a photocurable adhesive is used as the adhesive, the adhesive is cured by irradiating with UV or other curing light in addition to the heat pressing by the thermocompression bonding tool.

  As shown in FIG. 13, the adhesive layered or applied to the support 5 is formed between the side surface of the film roll 4 and the adhesive layer 10 formed between the layers of the adhesive film 2 wound in multiple layers. Become. By forming the adhesive layer 10 between the layers of the adhesive film 2, the adhesive film winding body 1 can further prevent winding deviation and collapse.

  In addition, the adhesive layer 10 is expected to suppress protrusion by contacting the binder resin layer 22 of the adhesive film 2 exposed on the side surface of the film roll 4. Further, when the support 5 is peeled from the side surface of the film roll 4, the adhesive layer 10 is also removed from the side surface of the film roll 4. That is, even if there is a protruding portion of the binder resin that causes a drawing failure such as blocking between the layers of the adhesive film 2, it is expected to be removed together with the adhesive layer 10 and hinders unwinding of the adhesive film 2. It can be expected to pull out smoothly.

[Anisotropic conductive film]
Next, an anisotropic conductive film 20 will be described as a specific example of the adhesive film 2. FIG. 14A is a cross-sectional view illustrating a configuration example of the anisotropic conductive film 20. The anisotropic conductive film 20 includes a base film 21 serving as a base material, and a binder resin layer 22 that is laminated on the base film 21 and contains conductive particles 23. The anisotropic conductive film 20 is formed in a tape shape, and the film roll 4 is formed by winding the base film 21 around the reel core 3 so as to be on the outer peripheral side.

  The anisotropic conductive film 20 includes a binder resin layer 22 between a bump (electrode) of an electronic component such as an IC chip, an LSI chip, or a flexible printed circuit board (FPC) and an electrode formed on a glass substrate or an insulating substrate. By interposing, the electronic component is connected to the substrate, and the conductive particles 23 are sandwiched between the bumps of the electronic component and the electrodes formed on the substrate, thereby conducting.

  The adhesive composition of the binder resin layer 22 includes a normal binder component containing, for example, a film-forming resin, a thermosetting resin, a latent curing agent, a silane coupling agent, and the like.

  As the film-forming resin, a resin having an average molecular weight of about 10,000 to 80,000 is preferable, and various resins such as an epoxy resin, a modified epoxy resin, a urethane resin, and a phenoxy resin are particularly mentioned. Among these, phenoxy resin is preferable from the viewpoint of film formation state, connection reliability, and the like.

  It does not specifically limit as a thermosetting resin, For example, a commercially available epoxy resin, an acrylic resin, etc. can be used.

  The epoxy resin is not particularly limited. For example, naphthalene type epoxy resin, biphenyl type epoxy resin, phenol novolac type epoxy resin, bisphenol type epoxy resin, stilbene type epoxy resin, triphenolmethane type epoxy resin, phenol aralkyl type epoxy resin. Naphthol type epoxy resin, dicyclopentadiene type epoxy resin, triphenylmethane type epoxy resin and the like. These may be used alone or in combination of two or more.

  There is no restriction | limiting in particular as an acrylic resin, According to the objective, an acrylic compound, liquid acrylate, etc. can be selected suitably. For example, methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, trimethylolpropane triacrylate, dimethylol tricyclodecane diacrylate, tetramethylene glycol tetraacrylate, 2-hydroxy-1,3 -Diacryloxypropane, 2,2-bis [4- (acryloxymethoxy) phenyl] propane, 2,2-bis [4- (acryloxyethoxy) phenyl] propane, dicyclopentenyl acrylate, tricyclodecanyl acrylate , Tris (acryloxyethyl) isocyanurate, urethane acrylate, epoxy acrylate and the like. In addition, what made acrylate the methacrylate can also be used. These may be used individually by 1 type and may use 2 or more types together.

  The latent curing agent is not particularly limited, and examples thereof include a heat curing type curing agent. The latent curing agent does not normally react, but is activated by various triggers selected according to applications such as heat, light, and pressure, and starts the reaction. The activation method of the thermal activation type latent curing agent includes a method of generating active species (cation, anion, radical) by a dissociation reaction by heating, etc., and it is stably dispersed in the epoxy resin near room temperature, and epoxy at high temperature There are a method of initiating a curing reaction by dissolving and dissolving with a resin, a method of initiating a curing reaction by eluting a molecular sieve encapsulated type curing agent at a high temperature, and an elution / curing method using microcapsules. Thermally active latent curing agents include imidazole, hydrazide, boron trifluoride-amine complexes, sulfonium salts, amine imides, polyamine salts, dicyandiamide, etc., and modified products thereof. The above mixture may be sufficient. As the radical polymerization initiator, a known one can be used, and among them, an organic peroxide can be preferably used.

  Although it does not specifically limit as a silane coupling agent, For example, an epoxy type, an amino type, a mercapto sulfide type, a ureido type etc. can be mentioned. By adding the silane coupling agent, the adhesion at the interface between the organic material and the inorganic material is improved.

[Conductive particles]
Examples of the conductive particles 23 contained in the binder resin layer 22 include any known conductive particles used in anisotropic conductive films. That is, as the conductive particles, for example, particles of various metals and metal alloys such as nickel, iron, copper, aluminum, tin, lead, chromium, cobalt, silver, gold, metal oxide, carbon, graphite, glass, ceramic, Examples thereof include those in which the surface of particles such as plastic is coated with metal, or those in which the surface of these particles is further coated with an insulating thin film. In the case where the surface of the resin particle is coated with metal, examples of the resin particle include an epoxy resin, a phenol resin, an acrylic resin, an acrylonitrile / styrene (AS) resin, a benzoguanamine resin, a divinylbenzene resin, a styrene resin, and the like. Can be mentioned. The size of the conductive particles 23 is preferably 1 to 30 μm, but is not limited thereto.

  The adhesive composition constituting the binder resin layer 22 is not limited to the case where it contains a film-forming resin, a thermosetting resin, a latent curing agent, a silane coupling agent, etc. You may make it comprise from any material used as an adhesive composition of a film.

  The base film 21 that supports the binder resin layer 22 is made of, for example, a release agent such as silicone on PET (Poly Ethylene Terephthalate), OPP (Oriented Polypropylene), PMP (Poly-4-methylpentene-1), PTFE (Polytetrafluoroethylene), and the like. It coats and prevents the anisotropic conductive film 20 from drying, and maintains the shape of the anisotropic conductive film 20.

  The anisotropic conductive film 20 may be produced by any method, but can be produced, for example, by the following method. An adhesive composition containing a film-forming resin, a thermosetting resin, a latent curing agent, a silane coupling agent, conductive particles 23 and the like is prepared. An anisotropic conductive film 20 in which the binder resin layer 22 is supported on the base film 21 by applying the adjusted adhesive composition onto the base film 21 using a bar coater, a coating apparatus, and the like, and drying it by an oven or the like. Get.

  In addition, the anisotropic conductive film 20 forms the film roll 4 by being wound around the reel core 3, and is unwound from the reel core 3 at the time of use, cut by a predetermined length, and used. The anisotropic conductive film 20 may be laminated with a release film (not shown) on the surface of the binder resin layer 22 that is not supported by the base film 21.

[Conductive particle non-contact independent ACF]
Here, the anisotropic conductive film 20 may be a film in which conductive particles 23 that exist independently in a non-contact manner in accordance with the bump area and layout are ubiquitous in plan view. In addition, such a state in which the conductive particles 23 exist independently without being in contact with each other is that the conductive particles 23 are intentionally separated by a predetermined distance or more (for example, 0.5 times or more of the conductive particle diameter). It may be created by arranging them regularly or regularly. The conductive particles 23 may form a plurality of units that are in contact with each other or arranged, and these conductive particle units are arranged independently of each other in a non-contact manner with respect to other units, like a single conductive particle. Is done. Examples of the regular arrangement of the conductive particles 23 and the conductive particle units include a tetragonal lattice shape, a rhombic lattice shape, a hexagonal lattice shape, and the like, but the regular arrangement is not limited thereto.

  In this way, when the conductive particles are not in contact with each other and are present individually or arranged, it is easy to grasp the pushing state of the conductive particles for each bump. Therefore, the use of such an anisotropic conductive film can be expected to facilitate the prior preparation (conditioning) of connection conditions.

  Since the conductive particles 23 are present in a non-contact and independent manner in a plan view, the anisotropic conductive film 20 is densely distributed in the distribution of the conductive particles because the conductive particles 23 are randomly dispersed and aggregates are formed. Since the probability that each conductive particle 23 is captured is improved between the fine pitched bumps and the electrodes as compared with the case where the same electronic component is anisotropically connected as compared with the case where the phenomenon occurs. The blending amount of the particles 23 can be reduced. Thereby, when the conductive particles 23 are randomly dispersed, the number of conductive particles is required to be a certain amount or more, so there is a concern about the occurrence of aggregates and connection in the space between adjacent bumps. Since the conductive particles need only be provided in the non-contact and independent state, the occurrence of such a short circuit between the bumps can be suppressed, and the bumps of the electronic component and the substrate can be prevented. The number of conductive particles 23 that do not contribute to conduction between the electrodes can be reduced. Further, if the number of conductive particles can be reduced, an effect of cost reduction can be expected.

  Such an anisotropic conductive film 20 is formed by, for example, applying a pressure-sensitive adhesive on a stretchable sheet, arranging the conductive particles 23 on the single layer, and then stretching the sheet at a desired stretch ratio to form a binder. A method of transferring to the resin layer 22, a method of transferring the conductive particles 23 to the binder resin layer 22 supported by the base film 21 after aligning the conductive particles 23 in a predetermined arrangement pattern on the substrate, or a method of transferring to the base film 21 On the supported binder resin layer 22, it can manufacture by the method of supplying the electrically-conductive particle 23 through the arrangement | sequence board provided with the opening part according to an arrangement | sequence pattern. In addition, the manufacturing method of the anisotropic conductive film 20 is not specifically limited.

[Laminated ACF]
In addition, as shown in FIG. 14B, the anisotropic conductive film according to the present technology includes a conductive resin composed of an insulating adhesive layer 24 composed only of a binder resin layer 22 and a binder resin layer 22 containing conductive particles 23. The particle-containing layer 25 may be stacked. In the anisotropic conductive film 26 shown in FIG. 14B, the insulating adhesive layer 24 is laminated on the base film 21, the conductive particle-containing layer 25 is laminated on the insulating adhesive layer 24, and the conductive particle-containing layer 25. The side is affixed to the substrate, and an electronic component such as an IC chip is mounted from the insulating adhesive layer 24 side. The anisotropic conductive film 26 has a release film (not shown) laminated on the conductive particle-containing layer 25.

  The anisotropic conductive film 26 has a fluidity of the insulating adhesive layer 24 of the conductive particle-containing layer 25 because, for example, the minimum melt viscosity of the insulating adhesive layer 24 is lower than the minimum melt viscosity of the conductive particle-containing layer 25. Higher than fluidity. Therefore, when the anisotropic conductive film 26 is interposed between the substrate and an electronic component such as an IC chip and is heated and pressed by the thermocompression bonding head, first, the insulating adhesive layer 24 having a low melt viscosity is formed on the substrate and the electronic component. It is filled between parts. Since the conductive particle-containing layer 25 having a high melt viscosity has low fluidity, the flow of the conductive particles 23 is suppressed even when the binder resin layer 22 is melted between the substrate and the electronic component by heating and pressing. Moreover, the flow of the conductive particles 23 is also suppressed when the insulating adhesive layer 24 that has flowed first and filled between the substrate and the electronic component starts a curing reaction. Therefore, the connection body between the substrate and the electronic component can reduce the occurrence of a short circuit between the bumps without the conductive particles 23 aggregating between the adjacent bumps.

  The anisotropic conductive film 26 may be one in which only the conductive particle-containing layer 25 is laminated. In this case, the fluidity of each conductive particle-containing layer 25 may be the same or different.

  In the anisotropic conductive film 26 as well, by arranging the conductive particles 23 in the conductive particle-containing layer 25 independently in a non-contact manner in a plan view, the particle capture rate can be increased even between fine pitched bumps. In addition, the occurrence of a short circuit between bumps can be reduced without causing the conductive particles 23 to aggregate between adjacent bumps.

  In the above-described embodiment, the anisotropic conductive films 20 and 26 obtained by forming a thermosetting resin composition appropriately containing the conductive particles 23 in the binder resin layer 22 into a film shape are used as the anisotropic conductive adhesive. Although demonstrated to the example, the adhesive agent which concerns on this technique is not limited to this, For example, the insulating adhesive film which consists only of the binder resin layer 22 may be sufficient.

  Next, examples of the present technology will be described. In this example, an adhesive film winding body using a flangeless reel core was prepared, and an adhesive film by a drop test was compared with an example in which a support was affixed to the side of a film roll and a comparative example in which a support was not affixed The presence or absence of omission and the occurrence rate of blocking were evaluated. As a reference example, an adhesive film wound body in which an adhesive film was wound around a flanged reel core was prepared, and the presence / absence of blocking of the adhesive film by a drop test and the occurrence rate of blocking were similarly evaluated.

  The condition of the drop test was that the anisotropic conductive film 300m according to Examples and Comparative Examples was wound around a reel core. The diameter of the adhesive film winding body was 195 mm. The wound body was packaged in a polyethylene film, and then 30 rolls were stored in cardboard (28 × 30 × 29 cm), and a known bubble cushioning material or foam cushioning material was spread and packed in the same manner as in the transport mode. Then, the cardboard was dropped from a height of 1 m, and it was confirmed whether or not the anisotropic conductive film was dropped from the reel core.

  Moreover, the incidence rate of blocking was confirmed by the presence or absence of occurrence when the adhesive film was manually pulled out from the adhesive film wound body according to the example and the comparative example. The number of times was 50, and the occurrence rate was determined from the presence or absence of this occurrence. Those in which blocking occurred even once per roll were counted as having blocking. Practically, the occurrence rate of blocking is preferably 20% or less, more preferably 15% or less, and even more preferably 10% or less.

The anisotropic conductive film which concerns on an Example and a comparative example was created as follows. As a binder resin layer, 60 parts by mass of a phenoxy resin (trade name: YP50, manufactured by Nippon Steel Chemical Co., Ltd.), 35 parts by mass of a radical polymerizable resin (trade name: EB-600, manufactured by Daicel Cytec Co., Ltd.), a silane coupling material (Product name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.) 2 parts by mass and reaction initiator (trade name: Perhexa C, manufactured by Nippon Oil & Fats Co., Ltd.) 2 parts by mass were prepared to prepare an adhesive composition. . Next, conductive particles (trade name: AUL704, manufactured by Sekisui Chemical Co., Ltd.) were dispersed in this adhesive composition so that the surface area density of the particles in the adhesive layer was 8000 / mm ² . Subsequently, the adhesive composition in which the conductive particles were dispersed was applied on a PET film (thickness 50 μm, base film original fabric) to a thickness of 14 μm, dried and cut. Thereby, the adhesive film concerning an Example and a comparative example was produced.

  Moreover, the support body used for each Example was a PET film of width 10mm, and this support body was affixed on the side surface of the film roll through the thermosetting adhesive agent. The adhesive used for sticking the support is obtained by removing conductive particles from the same components as the binder resin of the anisotropic conductive film according to the above-described Examples and Comparative Examples.

[Example 1]
In Example 1, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. Moreover, 4 support bodies were affixed at equal intervals only on one side of the film roll. The support was attached by heating and pressing with a thermocompression bonding tool under the conditions of 60 ° C., 1 MPa, and 1 sec. The adhesive film was unwound from the film roll after the support was peeled off. The peel strength was 0.2 N / mm.

  In the adhesive film wound body according to Example 1, the adhesive film did not fall off from the film roll even in the drop test, and the occurrence rate of blocking was 14%, and the evaluation was OK.

[Example 2]
In Example 2, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. In addition, four support members were attached to both sides of the film roll at equal intervals and symmetrically. The support was attached by heating and pressing with a thermocompression bonding tool under the conditions of 60 ° C., 1 MPa, and 1 sec. The adhesive film was unwound from the film roll after the support was peeled off. The peel strength was 0.2 N / mm.

  In the adhesive film winding body according to Example 2, the adhesive film did not fall off from the film roll even in the drop test, the occurrence rate of blocking was 10%, and the evaluation was OK.

[Example 3]
In Example 3, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. In addition, four support members were attached to both sides of the film roll at equal intervals and symmetrically. The support was attached by heating and pressing with a thermocompression bonding tool under the conditions of 60 ° C., 1 MPa, and 1 sec. The adhesive film was unwound from the film roll without peeling off the support.

  In the adhesive film winding body according to Example 3, the drop of the adhesive film from the film roll did not occur even in the drop test, the occurrence rate of blocking was 0%, and the evaluation was OK.

[Example 4]
In Example 4, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. In addition, 8 supports were attached to both sides of the film roll at equal intervals and symmetrically. The support was attached by heating and pressing with a thermocompression bonding tool under the conditions of 60 ° C., 1 MPa, and 1 sec. The adhesive film was unwound from the film roll after the support was peeled off. The peel strength was 0.2 N / mm.

  In the adhesive film winding body according to Example 4, the drop of the adhesive film from the film roll did not occur even in the drop test, the occurrence rate of blocking was 0%, and the evaluation was OK.

[Example 5]
In Example 5, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. In addition, four support members were attached to both sides of the film roll with an equal interval of 45 degrees. The support was attached by heating and pressing with a thermocompression bonding tool under the conditions of 60 ° C., 1 MPa, and 1 sec. The adhesive film was unwound from the film roll after the support was peeled off. The peel strength was 0.2 N / mm.

  In the adhesive film winding body according to Example 5, the dropping of the adhesive film from the film roll did not occur even in the drop test, the occurrence rate of blocking was 0%, and the evaluation was OK.

[Comparative Example 1]
In Comparative Example 1, an adhesive film having a width of 1.5 mm was wound around a reel core over 300 m. Moreover, the support body was not affixed on the side surface of the film roll.

  In the adhesive film winding body according to Comparative Example 1, the drop of the adhesive film from the film roll occurred due to the drop test. Further, the occurrence rate of blocking was 83%, and the evaluation was NG.

  As shown in Table 1, in Examples 1 to 5 in which a support was attached to the side surface of the film roll, it was found that the film roll had the same performance as an adhesive film winding body using a flanged reel core. That is, in Examples 1-5, it turns out that the drop of the adhesive film by a drop test does not generate | occur | produce, and even if it ships and conveys in this flangeless state, the problem in actual use does not generate | occur | produce.

  Moreover, the incidence of blocking was as low as 14% or less. This is because when the side surface of the film roll after peeling the support was observed, almost no foreign matter such as a binder resin was found, so that the interlayer of the adhesive film wound in multiple layers with the peeling of the support. This is probably because the binder resin adhered over the entire surface was removed.

  On the other hand, in Comparative Example 1, since the side surface of the film roll was not fixed by the support, the adhesive film was dropped from the film roll by the drop test, so that it could not be used. In addition, the incidence of blocking was as high as 83%. This is because the binder resin that protruded by tightening was adhered and cured between the layers of the adhesive film wound in multiple layers.

  In addition, from the adhesive film winding body which concerns on Examples 1-5, the winding length of the adhesive film was changed from 300 m to 50 m, and the dropout by the drop test was similarly performed on the adhesive film winding body sample having the same other conditions. The presence / absence and blocking occurrence rate were determined, but the same results as in Examples 1 to 5 were obtained, and it was found that there was no practical problem.

  Moreover, from the adhesive film winding body which concerns on Examples 3-5, the adhesive film width | variety was changed from 1.5 mm to 0.8 mm, and the other conditions were the same, and the adhesive film winding body sample (Example 3'-5) As for '), the presence or absence of dropping and the occurrence rate of blocking were determined in the same manner. However, as in Examples 3 to 5, no dropping occurred due to the drop test, and the blocking rate was also 20% in Example 3'. As a result, it was found that Example 4 ′ had a result of 15% and Example 5 ′ had a value of 0%, and there was no practical problem.

DESCRIPTION OF SYMBOLS 1 Adhesive film winding body, 2 Adhesive film, 3 Reel core, 3a Shaft hole, 4 Film roll, 5 Support body, 10 Adhesive layer, 20 Anisotropic conductive film, 21 Base film, 22 Binder resin, 23 Conductive particle, 24 Insulating adhesive layer, 25 conductive particle-containing layer, 26 anisotropic conductive film

Claims (18)

It is a reel core and an adhesive film wound around it.
The adhesive film winding body by which the support body was stuck to the side surface of the film roll formed by winding the said adhesive film.   The adhesive film winding body according to claim 1, wherein the width of the adhesive film is 5 cm or less.   The adhesive film winding body according to claim 1, wherein the support is also attached to the core.   The adhesive film winding body according to any one of claims 1 to 3, wherein the support is attached to one side surface of the film roll.   The adhesive film winding body according to any one of claims 1 to 4, wherein the support is attached to one side surface and the other side surface of the film roll. The support is in the form of a tape,
The adhesive film winding body according to any one of claims 1 to 5, wherein one or a plurality of the support bodies are pasted over a radial direction of the film roll. The support is in the form of a tape,
The adhesive film winding body according to any one of claims 1 to 6, wherein one or a plurality of the support bodies are radially attached to a side surface of the film roll.   The adhesive film winding body according to claim 6 or 7, wherein the support is attached to one side and the other side of the film roll through a hole on the roll body and / or the core.   The said support body is an adhesive film winding body of any one of Claims 1-8 currently affixed on the area | region within 3 cm in the radial direction of the said film roll from the outer edge of the said reel core.   The said support body is affixed to the area | region within 80% of the length of the radial direction of a film roll at least from the upper edge of the said film roll to the radial direction of the said film roll. The adhesive film winding body as described.   The said support body is a sheet form, The adhesive film winding body of any one of Claims 1-5.   The adhesive film winding body according to claim 11, wherein the support covers 50% of an area of a side surface of the film roll.   The said film roll is an adhesive film winding body of any one of Claims 1-12 in which the adhesive layer is formed over the interlayer of the said adhesive film in the sticking site | part of the said support body.   The adhesive film winding body according to claim 13, wherein the adhesive layer is removed as the support is peeled off. Winding an adhesive film around the reel core;
A method of manufacturing an adhesive film winding body including a step of attaching a support to a side surface of a film roll made of the adhesive film wound around the reel core.   The said support body is a manufacturing method of the adhesive film winding body of Claim 15 stuck on the side surface of the said film roll, when the said adhesive agent is thermoset or photocured.   The said film roll is a manufacturing method of the adhesive film winding body of Claim 16 in which an adhesive layer is formed over the interlayer of the said adhesive film in the sticking site | part of the said support body.   The said adhesive layer is a manufacturing method of the adhesive film winding body of Claim 17 removed with peeling of the said support body.

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