JP6656871B2 - Adhesive products with tabs - Google Patents

Description

  The present invention relates to an adhesive product with a tab.

  In general, a pressure-sensitive adhesive (also referred to as a pressure-sensitive adhesive; the same applies hereinafter) exhibits a soft solid (viscoelastic body) state in a temperature range around room temperature, and has a property of easily adhering to an adherend by pressure. Taking advantage of such properties, the pressure-sensitive adhesive is preferably used in the form of a pressure-sensitive adhesive sheet, for example, for fixing components in portable electronic devices such as mobile phones, smartphones, and tablet computers. Further, the pressure-sensitive adhesive sheet stuck to the adherend can be removed from the adherend at the time of repair, replacement, inspection, recycling, and the like of the adherend and its peripheral members. Patent Literatures 1 to 6 disclose prior arts relating to this type of removable adhesive sheet. Patent Literatures 1 to 6 all disclose conventional techniques relating to an extensible pressure-sensitive adhesive sheet having a tab. Patent Literature 1 relates to a medical pressure-sensitive adhesive sheet to be attached to the skin.

JP-T-2005-500133 JP 2000-96006 A JP 2000-96007 A JP 2002-235046 A JP 2002-235058 A JP 2010-53917 A

  When removing the pressure-sensitive adhesive sheet from the adherend, it is desirable that the removal operation be completed without deformation or breakage of the adherend regardless of the strength or the like of the adherend. As one of the means, Patent Documents 2 to 6 disclose methods using an extensible pressure-sensitive adhesive sheet. In this method, a tab is provided at an end of the extensible pressure-sensitive adhesive sheet, and after the pressure-sensitive adhesive sheet is attached, the tab is gripped and pulled, thereby extending and deforming the pressure-sensitive adhesive sheet to reduce the bonding area. As a result, the adhesive sheet is removed from the adherend. Since this pressure-sensitive adhesive sheet has extensibility, the load on the adherend when the pressure-sensitive adhesive sheet is peeled off is significantly reduced. In such a removing method of pulling out the pressure-sensitive adhesive sheet by pulling the tab, it is important that the tab and the pressure-sensitive adhesive sheet are in close contact with each other so as to withstand the above-described pulling.

  Therefore, the present inventors have studied the adhesion between the pressure-sensitive adhesive sheet and the tab, and as a result, the composition of the pressure-sensitive adhesive and the material of the tab, not the tab configuration, can improve the adhesion between the pressure-sensitive adhesive sheet and the tab. We found a method and completed the present invention. That is, an object of the present invention is to provide a tab-mounted pressure-sensitive adhesive product having excellent adhesion between a pressure-sensitive adhesive sheet and a tab.

According to the present invention, there is provided an adhesive product with a tab including an extensible adhesive sheet and a tab fixed to the adhesive sheet. The tab includes a first tab film fixed to a first surface of the pressure-sensitive adhesive sheet, and a second tab film fixed to a second surface of the pressure-sensitive adhesive sheet.
A conventional tab as described in Patent Document 6 has a configuration in which one film is folded back and adhered to both sides of the end of the adhesive sheet. However, since a commonly used tab has rigidity and elasticity enough to withstand pulling, if the tab is folded back to be attached to an adhesive sheet, the tab tends to return to its original state due to its elasticity. Since the operation of the tab is an operation of peeling off from the adhesive sheet, it may cause a decrease in the adhesion between the adhesive sheet and the tab. Therefore, in the present invention, two tab films are used as tabs fixed to the adhesive sheet, and the two tab films are attached to the first surface and the second surface (the surface opposite to the first surface) of the adhesive sheet. ). With such a configuration, an adhesive product having excellent adhesion between the adhesive sheet and the tab is realized regardless of the adhesive means, the material, the thickness, and the like of the tab. For example, it is particularly useful in the case where it is difficult to obtain the adhesion between the pressure-sensitive adhesive sheet and the tab due to the properties (pressure-adhesion and the like) of the pressure-sensitive adhesive sheet and the tab material. Further, it is also possible to make the two tab films have different functions according to the purpose or the like.

  In a preferred aspect of the technology disclosed herein, the first tab film is smaller than the second tab film. In a more preferred aspect, the first surface of the pressure-sensitive adhesive sheet to which the first tab film is fixed has a sticking portion to be stuck to an adherend and an exposed portion protruding from the sticking surface of the adherend. Have. And the said exposure part is located between the said sticking part and the said 1st tab film. The exposed portion is obtained by reducing the size of the first tab film relatively to the second tab film fixed to the second surface of the pressure-sensitive adhesive sheet. According to such a configuration, by temporarily fixing the exposed portion of the pressure-sensitive adhesive sheet protruding to the outside of the adherend to the outer surface (side surface, upper surface, or the like) of the adherend, the tab located at an end portion from the exposed portion can also be formed. , So that it is arranged along the outer surface of the adherend and does not get in the way. Further, in the above configuration, since the first tab film forms a step (jagged step) with respect to the exposed portion, there is an advantage that the tab can be easily held.

  In a preferred aspect of the technology disclosed herein, the first tab film has a thickness different from that of the second tab film. For example, by making the first tab film thicker than the second tab film, the strength of the entire tab arranged on both surfaces of the adhesive sheet is improved, and for example, the workability such as shape processing and perforation is improved. . In addition, by forming the second tab film as thin as to make the surface of the pressure-sensitive adhesive sheet non-adhesive (non-adhesive) (for example, a thin coat of about several microns or less), the bulk due to the thickness of the tab is reduced. Tension can be suppressed. This can be an advantageous feature when there is no room for space on the second tab film side.

  In a preferred aspect of the technology disclosed herein, the first tab film is made of a different material from the second tab film. For example, the first tab film is made of a resin film and the second tab film is made of a non-adhesive thin layer coat, so that the thickness of the tab film on the second tab film side is caused while maintaining the function as a tab. Bulk can be suppressed.

  In a preferred aspect of the technology disclosed herein, the first tab film and the second tab film do not protrude from the adhesive sheet. By applying the technology disclosed herein, the shape of the tab can be made to match the outer periphery of the pressure-sensitive adhesive sheet. Such a tab typically does not protrude from the surface of the pressure-sensitive adhesive sheet, and may have high shape accuracy. In this configuration, the end surface (side surface) of the pressure-sensitive adhesive sheet in a region where the first and second tab films are attached may be an exposed surface that is not covered with the first and second tab films.

  In a preferred aspect of the technology disclosed herein, the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet. The effect of the technology disclosed herein is preferably realized in a double-sided adhesive pressure-sensitive adhesive sheet. The pressure-sensitive adhesive sheet, a film-like substrate, a first pressure-sensitive adhesive layer provided on the first surface of the film-like substrate, and a second pressure-sensitive adhesive layer provided on the second surface of the film-like substrate Is preferably provided.

  In one preferred aspect of the technology disclosed herein, a tabbed adhesive product is used to join two objects. In the pressure-sensitive adhesive product with a tab, in a state where the two objects are joined with the pressure-sensitive adhesive sheet interposed therebetween, the pressure-sensitive adhesive sheet is stretched by pulling the tab, and the joined state of the two objects is released. It is possible to By pulling the tabbed pressure-sensitive adhesive product in the above manner, the joined state of the two objects can be smoothly released. In addition, two objects may be two places of one article or one member.

  The adhesive product with a tab disclosed herein is preferably used for a portable electronic device. The tabbed pressure-sensitive adhesive product disclosed herein has excellent adhesion between the pressure-sensitive adhesive sheet and the tab. Utilizing this feature, it is particularly preferably used as an adhesive product for fixing a battery, which is often removed at the time of repair or replacement of members constituting an electronic device, product inspection, or the like. According to the technology disclosed herein, there is provided an adhesive product with a tab which is preferably used for fixing a battery. Therefore, according to the present specification, a portable electronic device in which a member (for example, a battery) is fixed by an adhesive product with a tab is provided.

  Further, according to the present invention, there is provided a method for producing an adhesive product with a tab. The method includes the steps of: providing an extensible pressure-sensitive adhesive sheet; fixing a first tab film to a first surface of the pressure-sensitive adhesive sheet; and fixing a second tab film to a second surface of the pressure-sensitive adhesive sheet; including. According to this method, a tabbed pressure-sensitive adhesive product having excellent adhesion between the pressure-sensitive adhesive sheet and the tab can be obtained. In a preferred aspect, the first tab film is smaller than the second tab film. Also, preferably, the first tab film has a thickness different from that of the second tab film. Further, it is preferable that the first tab film is made of a material different from that of the second tab film.

It is a side view which shows typically the example of 1 structure (embodiment 1) of the adhesive product with a tab. It is a typical side view which expands and shows a part of other example of composition (embodiment 2) of a tabbed adhesive product. It is a typical side view which expands and shows a part of other example of a structure (embodiment 3) of the adhesive product with a tab. It is a top view which shows typically the example of 1 structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object). It is a figure corresponding to FIG. 4, and is a schematic diagram for demonstrating the role of the non-sticking part at the time of peeling an adhesive product with a tab from an adherend. It is a top view which shows typically the example of 1 structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object). It is the schematic diagram which looked at the example of 1 structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object) from the upper surface. It is the schematic diagram which looked at another example of composition (reference embodiment) of the tabbed adhesive product in the state stuck on an adherend (object) from the upper surface. It is the schematic diagram which looked at another example of composition (reference embodiment) of the tabbed adhesive product in the state stuck on an adherend (object) from the upper surface. It is a top view which shows typically the example of 1 structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object). It is a top view which shows typically another example of a structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object). It is the schematic diagram which looked at the example of 1 structure (reference embodiment) of the adhesive product with a tab in the state attached to the to-be-adhered body (object) from the upper surface. It is the schematic diagram which looked at another example of composition (reference embodiment) of the tabbed adhesive product in the state stuck on an adherend (object) from the upper surface. It is a schematic side view for demonstrating one aspect of pulling removal, (a) is a figure which shows the state which starts pulling removal, (b) shows the state which pulls a tab and removes. It is a figure and (c) is a figure showing the state where tension removal was completed. It is a schematic top view for demonstrating one aspect of tension removal, (a) is a figure which shows the state which starts tension removal, and (b) shows the state which pulls a tab and removes. It is a figure and (c) is a figure showing the state where tension removal was completed. It is sectional drawing which shows an example of 1 structure of an adhesive sheet typically. It is explanatory drawing which shows the measuring method of a shear adhesive force typically. It is explanatory drawing which shows typically the measuring method of tensile peeling stress B.

  Hereinafter, preferred embodiments of the present invention will be described. It should be noted that matters other than those specifically mentioned in the present specification and necessary for the practice of the present invention are based on the teachings of the practice of the present invention described in the present specification and common technical knowledge at the time of filing. Can be understood by those skilled in the art. The present invention can be implemented based on the contents disclosed in this specification and common technical knowledge in the field. Further, in the drawings below, members and portions having the same action may be denoted by the same reference numerals and described, and redundant description may be omitted or simplified. In addition, the embodiment described in the drawings is schematically illustrated in order to clearly explain the present invention, and the size and scale of the adhesive product or the adhesive sheet of the present invention actually provided as a product, and the size and scale of the tab are not necessarily accurate. Not a representation.

In this specification, the term "pressure-sensitive adhesive" refers to a material which has a property of exhibiting a soft solid (viscoelastic body) state in a temperature range around room temperature and easily adhering to an adherend by pressure as described above. . The adhesive referred to here is generally a complex tensile modulus E ^* (1 Hz) as defined in "CA Dahlquist," Adhesion: Fundamental and Practice ", McLaren & Sons, (1966) P. 143. It is a material having a property satisfying <10 ⁷ dyne / cm ² (typically, a material having the above property at 25 ° C.).

  Further, in this specification, the term "stretchable pressure-sensitive adhesive sheet" refers to a pressure-sensitive adhesive sheet having such a degree of extensibility that an individual (a standard adult) can hold and stretch. Typically, when the adhesive sheet is pulled in the shearing direction in a state of being attached to the adherend, the adhesive area with the adherend decreases due to the elongation of the pressure-sensitive adhesive sheet, and it is possible to finally peel off the adherend. It may be a pressure-sensitive adhesive sheet having a possible degree of extensibility. Preferably, it may be a pressure-sensitive adhesive sheet showing the elongation at break described below. In addition, in this specification, an "extensible pressure-sensitive adhesive sheet" may be simply abbreviated as "pressure-sensitive adhesive sheet".

  Further, in this specification, the “band shape” refers to a shape extending linearly and having a width (length in a direction orthogonal to the direction extending linearly). The band shape is a shape having a predetermined length in the direction extending linearly and having a width shorter than the length, and is a concept including a rectangular shape and a strip shape. Therefore, the band shape can be rephrased as a long shape. The belt shape according to one embodiment has a shape extending linearly, but may have a shape extending curvedly, and may include a shape having a linearly extending portion and a curvedly extending portion. . The width of the band shape may not be constant.

  Further, in this specification, "tab" is used as a word meaning "knob" which is a starting point (pulling starting point) when the adhesive sheet is pulled, and other elements (shape, material, etc.) are not particularly limited. . Usually, the tab has a size that can be gripped with a finger and has a shape (for example, a flat rectangular shape) that can be gripped with a finger, but there may be a mode in which the tab is pulled using a machine or an instrument. Therefore, it is not necessary to have a size that can be gripped by a finger, and there is no limitation on the shape. For example, a tab having a perforation can have a small size because a hook can be inserted through the perforation and pulled. A typical tab is a continuous tab from the adhesive sheet, and preferably does not stretch by pulling, or if stretched, is less stretchable than the adhesive sheet.

<Adhesive product with tab>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. The adhesive product 501 with a tab shown in FIG. 1 includes an extensible adhesive sheet 510 and a tab 550 fixed to the adhesive sheet 510. The pressure-sensitive adhesive sheet 510 is double-sided adhesive, and has a first surface 510A bonded to an object (adherend) A, a second surface 510B bonded to another object (not shown), and The two objects are joined in a state of being sandwiched between the two objects. The adhesive sheet 510 has a band shape extending linearly when viewed from the top.

  A tab 550 is fixed to one end of the adhesive sheet 510 in the longitudinal direction. The tab 550 includes a first tab film 560 fixed to the first surface 510A of the adhesive sheet 510, and a second tab film 562 fixed to the second surface 510B of the adhesive sheet 510. Specifically, the tab 550 has a configuration in which a first tab film 560 and a second tab film 562 are stacked with an adhesive sheet 510 interposed therebetween. The first tab film 560 and the second tab film 562 are members independent of each other and are basically separated from each other, but may be partially in contact with each other.

  The first tab film 560 and the second tab film 562 have a substantially square shape when viewed from above. The first tab film 560 and the second tab film 562 of this embodiment have substantially the same size and the same shape. Therefore, the tabs 550 in which they overlap each other also have a substantially square shape. The first tab film 560 and the second tab film 562 of this embodiment are non-stretchable resin films, and their outer surfaces (surfaces opposite to the surface to be attached to the adhesive sheet 510) are non-adhesive. Sex.

  Since both first surface 510A and second surface 510B of adhesive sheet 510 have adhesive properties, first tab film 560 and second tab film 562 are attached to first surface 510A and second surface 510B of adhesive sheet 510, respectively. By attaching, it is fixed to the adhesive sheet 510. The adhesive sheet and the first and / or second tab films may be fixed using a known double-sided adhesive tape or adhesive.

  When the pressure-sensitive adhesive sheet 510 is viewed from above (when viewed toward the sheet surface of the pressure-sensitive adhesive sheet 510), the first tab film 560 and the second tab film 562 do not protrude from the pressure-sensitive adhesive sheet 510. In other words, the first tab film 560 and the second tab film 562 do not protrude from the outer edge of the adhesive sheet 510 (typically, the edge located at one end of the adhesive sheet 510 and both sides thereof). Therefore, the end face and the side face of the adhesive sheet 510 in the end area (the predetermined area including one end) to which the first tab film 560 and the second tab film 562 are stuck are not covered with the tab 550, and the adhesive sheet is 510 is exposed when viewed from the side. The shape of the tab 550 in this embodiment is substantially the same as the outer periphery (outer edge) of the adhesive sheet 510 at and near the end of the adhesive sheet 510.

  The ratio of the adhesion area with the pressure-sensitive adhesive sheet 510 on the pressure-sensitive adhesive sheet-attached surface (one side) of the first tab film 560 is, from the viewpoint of restricting the protrusion of the tab 550 out of the pressure-sensitive adhesive sheet 510, while obtaining a good adhesion state. It is suitably 90% or more, preferably 95% or more (for example, 95% to 100%, typically 99% to 100%). For the same reason, the ratio of the adhesion area of the second tab film 562 to the pressure-sensitive adhesive sheet 510 on the pressure-sensitive adhesive sheet-attached surface (one side) is appropriately 90% or more, preferably 95% or more (for example, 95% or more). % To 100%, typically 99% to 100%).

  Further, the thickness of the first tab film 560 and the second tab film 562 can be set according to the purpose and the like, and is not limited to a specific range, but is generally about 1 μm or more and 1 mm or less. It is suitable that it is 2 μm to 500 μm (for example, 5 μm to 300 μm, typically 10 μm to 100 μm). According to the technology disclosed herein, the thickness of the tab such that at least one (typically both) of the first and second tab films has a thickness of 30 μm or more (eg, 50 μm or more, and even 70 μm or more). Even in a configuration having a large size, it is possible to realize excellent adhesion (adhesion between the pressure-sensitive adhesive sheet and the tab). Such a thick tab tends to be excellent in gripping property and excellent in workability for removing an adhesive product. In addition, from the viewpoint of space saving or the like, the thickness of at least one of the first and second tab films (typically, both) is limited to 60 μm or less (for example, 40 μm or less, typically 20 μm or less). Is preferred. The thickness of the first tab film 560 and the second tab film 562 may be the same or different.

  An adhesive product with a tab 502 shown in FIG. 2 is a modified example of the above embodiment. In the adhesive product with a tab 502, the first tab film 560 arranged on the first surface 510A of the adhesive sheet 510 is smaller than the second tab film 562 arranged on the second surface 510B of the adhesive sheet 510. In other words, the area per side of the first tab film 560 is smaller than the area per side of the second tab film 562. Further, the first tab film 560 and the second tab film 562 have different shapes (specifically, different square shapes). Specifically, the first tab film 560 and the second tab film 562 each having a square shape have a width substantially equal to the width of the band-shaped adhesive sheet 510. The first tab film 560 and the second tab film 562 each have one side (part of the outer edge) along one end (outer edge) of the band-shaped adhesive sheet 510. However, the length of the first tab film 560 (specifically, the length of one side of the square) in the longitudinal direction of the adhesive sheet 510 is shorter than that of the second tab film 562.

  As described above, since the first tab film 560 has a smaller size than the second tab film 562, the first surface 510A of the adhesive sheet 510 to which the first tab film 560 is fixed is attached to the first surface 510A of the adhesive sheet 510 in the longitudinal direction. There is an exposed portion 518 corresponding to the difference between the length of the first tab film 560 and the length of the second tab film 562. The exposed portion 518 is located between the attaching portion 512 to be attached to the adherend A and the attaching portion 512 and the first tab film 560, and protrudes from the adhered surface of the adherend A. By temporarily fixing the exposed portion 518 to the outer surface (side surface, upper surface, or the like) of the adherend A in a state where the adhesive product with tab 502 is attached to the adherend A, the tab 550 is formed on the adherend A. Located along the outer surface, out of the way. Further, in the above configuration, since the first tab film 560 forms a step (jagged step) with respect to the exposed portion 518, the tab 550 can be easily held. Note that there is no exposed portion on the second surface 510B of the adhesive sheet 510. Other items are basically the same as those in the configuration shown in FIG.

In the configuration as shown in FIG. 2, the difference in the length _{L T2} in the longitudinal direction of the first tab film 560 and the length _{L T1} second tab film 562 of the adhesive sheet _510, and L T1 _{/ L T2} is less than 1 It may be set appropriately within a certain range. From the viewpoint of sufficiently obtaining the effect of providing the exposed portion 518, it is preferable that L _T1 / L _{T2 be} approximately 2/3 or less (for example, approximately 1/2 or less). From the viewpoint of sufficiently exhibiting the function of the first tab film 560, it is preferable that L _T1 / L _T2 be approximately 1/4 or more (for example, approximately 1/3 or more).

The adhesive product with tab 503 shown in FIG. 3 is also a modification of the above embodiment. In this tabbed adhesive product 503, the first tab film 560 has a thickness different from that of the second tab film 562. Specifically, the thickness T _T1 of the first tab film 560 is larger than the thickness T _T2 of the second tab film 562. Thereby, the strength of the entire tab 550 fixed to the pressure-sensitive adhesive sheet 510 is improved, and workability such as shape processing and perforation is improved. Accordingly, the tabs disclosed herein (including the first tab film and the second tab film) may be provided with perforations. Further, since the thickness T _T2 of the second tab film 562 is small, bulkiness due to the thickness of the tab 550 can be suppressed. Although not particularly shown, an adherend that adheres to the second surface 510B of the adhesive sheet 510 can be disposed on the entire lower surface of the adhesive product with tab 503 (including the lower surface of the second tab film 562). In that case, it may be an advantageous feature that the second tab film 562 is thin. Other items are basically the same as those in the configuration shown in FIG.

In the configuration as shown in FIG. 3, the thickness T _T1 of the first tab film 560 thickness difference between thickness T _T2 of the second tab film 562, because it can be appropriately set depending on purposes, in particular Not limited. When the thickness T _T1 of the first tab film 560 is increased, the ratio (T _T1 / T _T2 ) exceeds 1 and is approximately 1.5 or more (for example, approximately 2 or more, and further approximately 3 or more). Is appropriate. Further, the ratio (T _T1 / T _T2 ) is suitably set to about 10 or less (for example, about 5 or less, or about 2 or less). Further, depending on the use form, the object to be adhered, and the like, there may be a case where it is desired to set the thickness of the second tab film 562 large. In that case, the ratio (T _T1 / T _T2 ) is less than 1 and is preferably about 2/3 or less (for example, about 1/2 or less, and more preferably about 1/3 or less). (T _T1 / T _T2 ) is suitably set to about 1/10 or more (for example, about 1/5 or more, or about 1/2 or more).

  In the above embodiment, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with tabs is a double-sided pressure-sensitive adhesive sheet having a belt shape, but the shape of the pressure-sensitive adhesive sheet disclosed herein is not limited thereto. The pressure-sensitive adhesive sheet may have, for example, a square shape, or may have a band-like portion in part. The pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above-described embodiment, but is not limited thereto, and may have a shape extending in a curved shape or a shape having a straight line and a curved line (for example, a U-shape). Or a U-shape, arc shape, wavy shape, zigzag shape, or the like. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the pressure-sensitive adhesive sheet having a band shape. The same applies to the first tab film and the second tab film constituting the tab.

  In the above embodiment, the first tab film and the second tab film constituting the tab have the same size (size and thickness); have different sizes; have different thicknesses. However, other than these, for example, the first tab film and the second tab film can be formed of different materials. Further, two or more of the above configurations can be combined.

<Adhesive product with tab (Reference Embodiment 1)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. The adhesive product with a tab 1 shown in FIG. 4 includes an extensible adhesive sheet 10 and a tab 50 provided at an end of the adhesive sheet 10. The pressure-sensitive adhesive sheet 10 has an attaching portion 12 attached to the objects (adherends) A1 and A2, and a non-attaching portion 14 located between the attaching portion 12 and the tab 50. In this embodiment, in the adhesive product with a tab 1, the sticking part 12, the non-sticking part 14, and the tab 50 have a continuous positional relationship in this order.

  The adhesive sheet 10 has a band shape extending linearly. The sticking portion 12 of the adhesive sheet 10 is in a state of being sandwiched between the objects A1 and A2, and is adhered to the objects A1 and A2. Specifically, the pressure-sensitive adhesive sheet 10 of this embodiment is double-sided adhesive, and the respective pressure-sensitive adhesive surfaces of the sticking portion 12 are bonded to the objects A1 and A2, respectively. On the other hand, the non-sticking portion 14 protrudes outside between the objects A1 and A2, and does not adhere to the object A1. Therefore, the non-sticking part 14 and the tab 50 arranged ahead are exposed outside the objects A1 and A2. In this embodiment, the pasting unit 12 and the non-pasting unit 14 are separated by a straight line (a straight line orthogonal to the longitudinal direction of the adhesive sheet 10) corresponding to the outer periphery of the object A1.

  A tab 50 is fixed to one end of the adhesive sheet 10 in the longitudinal direction. The tab 50 has a substantially square shape when viewed from above. The tab 50 of this embodiment is a non-stretchable resin film, and its surface is non-adhesive. The tab 50 is fixed to the adhesive sheet 10 by being attached to the adhesive surface (both sides) at the end of the adhesive sheet 10.

  Here, a technical advantage of providing the non-sticking portion 14 in the tab-coated adhesive product 1 will be described with reference to FIGS. The pressure-sensitive adhesive sheet 10 of the pressure-sensitive adhesive product 1 with tabs shown in FIG. 4 is the double-sided pressure-sensitive adhesive sheet 10 as described above, and the respective pressure-sensitive adhesive surfaces of the sticking portion 12 are bonded to the objects A1 and A2, respectively. When the tab 50 fixed to one end of the adhesive sheet 10 is pulled in the state where the sticking section 12 is adhered to the objects A1 and A2, the position between the tab 50 and the sticking section 12 is increased as shown in FIG. The non-pasting section 14 extends in preference to the pasting section 12. This is mainly based on the low resistance due to the non-adhesion of the non-sticking portion 14 and the positional relationship. Due to the extension of the non-sticking portion 14, as can be understood from FIG. 5, the bonding area of the sticking portion 12 of the adhesive sheet 10 with the objects A1 and A2 decreases. Usually, the peeling of the affixing portion 12 (typically, the peeling by pulling) requires a large amount of force in the initial stage in which the adhesive state with the objects A1 and A2 becomes a resistance, particularly when the adhesive sheet 10 starts to expand. On the other hand, by providing the non-sticking part 14, the pressure-sensitive adhesive sheet 10 starts to peel off from the objects A and A2 with a relatively small force for extending the non-sticking part 14. As a result, the subsequent peeling in the shear direction can proceed smoothly.

  Another advantage of providing the non-sticking portion 14 is the positioning of the tab 50. Specifically, after joining the two objects A1 and A2 with the adhesive sheet 10, the adhesive surface of the non-sticking portion 14 is brought into contact with the outer surface of the object A1. Thereby, the non-sticking part 14 is temporarily fixed to the outer surface (typically a side surface) of the adherend, and the tab 50 continuous with the non-sticking part 14 is also arranged along the outer surface of the object A1, It does not get in the way. This advantage is more preferably exerted by setting the length of the non-sticking portion (the length in the longitudinal direction of the pressure-sensitive adhesive sheet 10) to be relatively long. For example, the non-sticking portion 14 of the adhesive product 1 with tabs is longer than the height of the side surface of the object A1 to the upper surface of the object A1 (the surface opposite to the surface to which the sticking portion 12 of the adhesive sheet 10 is stuck). Design to reach. In this configuration, when the adhesive surface of the non-sticking part 14 is brought into contact with the outer surface of the object A1 and temporarily fixed, the tab 50 is also arranged along the upper surface of the object A1 and does not interfere.

  The area ratio of the non-sticking part 14 in the adhesive sheet 10 is suitably 50% or less, and preferably 30% or less (for example, 20% or less, typically) from the viewpoint of sufficiently securing the area of the sticking part 12. 10% or less). Therefore, the area ratio of the attaching section 12 is suitably 50% or more, and preferably 70% or more (for example, 80% or more, typically 90% or more). Further, from the viewpoint of preferably exhibiting the function of the non-sticking part 14, the area ratio of the non-sticking part 14 is suitably 1% or more, and may be about 3% or more (for example, 5% or more). By setting the area ratio of the non-sticking portion 14 to a predetermined value or more, the tab 50 continuously exposed to the non-sticking portion 14 can be easily aligned with the adherend. In that case, it is appropriate that the area ratio of the attaching section 12 is 99% or less, and may be about 97% or less (for example, 95% or less).

  The ratio (L / W) of the length L to the width W of the adhesive sheet 10 is preferably 1 or more. The pressure-sensitive adhesive sheet 10 having such a shape can exhibit a good adhesive function to a rectangular adherend (for example, a battery or the like). Further, it is more preferable that the adhesive sheet 10 has a band shape (typically a rectangular shape) as in the present embodiment. In this case, the pressure-sensitive adhesive sheet having the above ratio (L / W) of about 2 or more (typically 3 or more, for example, 5 or more) depends on the shape and size of the adherend and the place where the adherend is attached. It tends to be excellent in handling. Although the upper limit of the ratio (L / W) is not particularly limited, the ratio (L / W) can be about 50 or less (for example, 30 or less, typically 20 or less) from the viewpoint of strength, handleability, and the like. .

  In the length L of the adhesive sheet 10 having a band shape, the ratio (L1: L2) between the length L1 of the sticking portion 12 and the length L2 of the non-sticking portion 14 is determined by securing the bonding area in the sticking portion 12. From the viewpoint of achieving both the peeling property by the non-sticking portion 14 (typically, the peeling property by pulling), the ratio is appropriately set to 99: 1 to 50:50, preferably 97: 3 to 60:40. (For example, 95: 5 to 70:30, typically 90:10 to 80:20). In addition, L2 is suitably about 1 mm or more, preferably 3 mm or more, and more preferably 5 mm or more (for example, 10 mm or more). It is appropriate that L2 is 30 mm or less (for example, 20 mm or less).

  In the above embodiment, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with tabs is a double-sided pressure-sensitive adhesive sheet having a band shape, but the shape of the pressure-sensitive adhesive sheet disclosed herein is not limited thereto. The pressure-sensitive adhesive sheet may have, for example, a square shape, or may have a band-like portion in part. The pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above-described embodiment, but is not limited thereto, and may have a shape extending in a curved shape or a shape having a straight line and a curved line (for example, a U-shape). Or a U-shape, arc shape, wavy shape, zigzag shape, or the like. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Further, in the above embodiment, the affixed portion and the non-affixed portion are separated by a line orthogonal to the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The classification of the sticking part and the non-sticking part of the pressure-sensitive adhesive sheet can be determined according to the shape of the object (adherend) to which the sticking part is stuck. In the technology disclosed herein, the sticking portion may typically be a portion that is entirely stuck to an adherend. On the other hand, the non-adhered portion is a portion where at least one surface (or both surfaces) is not attached to the adherend. The non-sticking part may be, for example, a part other than the sticking part in the adhesive sheet. From the viewpoint of positioning with respect to the adherend and the like, the pasting portion and the non-pasting portion can have different colors by, for example, including a coloring material such as a pigment. Further, a line or a mark may be provided at the boundary between the two.

  In addition, the non-sticking portion may be a portion that is not entirely stuck to the adherend, but in the present specification, the “non-sticking portion” is at least a surface that is not stuck to the adherend. Is used to mean a portion having Since the sticking of the pressure-sensitive adhesive sheet basically involves an intentional act (typically, pressure bonding), a temporarily fixed (temporarily fixed) state in which no pressure is applied is not considered to be stuck. Even if a part of the non-sticking part is in contact with the adherend, if the pressure is not applied and the non-adhesive (temporary fixation) state is reached, when the tab is gripped and the adhesive sheet is pulled, the adherend is The state of contact (temporary fixation) of the non-sticking part with the body can be easily eliminated. For example, as in the above embodiment, when the sticking portion of the pressure-sensitive adhesive sheet is sandwiched and adhered between two objects, the non-sticking portion may not be attached to at least one of the two objects. .

  Further, in the above embodiment, the surface of the non-sticking portion has adhesiveness, but the technology disclosed herein is not limited to this. The surface of the non-sticking portion and the surface of the sticking portion may be made of the same material (typically, an adhesive having the same composition) or may be made of different materials. The surface of the non-sticking part may be non-tacky or low-tacky. In addition, that the surface of the non-sticking part has low adhesiveness means that the adhesive strength (typically, peel strength with respect to SUS180 degrees) is lower than the surface of the sticking part. For example, the surface of the non-adhered portion can be made non-adhesive or low-adhesive by applying powder to the adhesive surface of the non-adhered portion or covering the adhesive surface with a thin film such as a resin film. In addition, when the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet with a substrate, the pressure-sensitive adhesive layer is not formed, or the formed pressure-sensitive adhesive layer is removed to make the surface of the non-sticking portion non-tacky or low-tack. be able to. In this case, the non-sticking part may be composed of only the base film having no pressure-sensitive adhesive layer.

  Moreover, in the said embodiment, although the non-sticking part was what was exposed from between two objects, it is not limited to this, and the non-sticking part has two objects joined by the sticking part. In a state, it may be between two objects. In that case, the surface of the non-sticking part is non-adhesive. Therefore, the non-sticking part does not have to be exposed outside the object (adherend).

  Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a process of making the surface of the pressure-sensitive adhesive sheet non-tacky or low-tacky. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the pressure-sensitive adhesive sheet having a band shape. In that case, the non-sticking part may be arranged between the tabs arranged at both ends and the sticking part.

<Adhesive product with tab (Reference Embodiment 2)>
The tabbed adhesive product disclosed herein may have a structure schematically illustrated in FIG. The adhesive product with a tab 101 shown in FIG. 6 includes an extensible adhesive sheet 110 and a tab 150 provided at an end of the adhesive sheet 110. The adhesive sheet 110 has an attaching section 112 and an anchor section 116. The attaching section 112 is a part for joining the objects (adherends) A1 and A2. The anchor unit 116 is fixed only to the object A2. The attaching section 112 is arranged between the anchor section 116 and the tab 150. In this embodiment, in the adhesive product with tab 101, the anchor portion 116, the attaching portion 112, and the tab 150 have a continuous positional relationship in this order.

  The adhesive sheet 110 has double-sided adhesiveness for joining the objects A1 and A2. Further, the pressure-sensitive adhesive sheet 110 has a band shape extending linearly. The sticking portion 112 of the adhesive sheet 110 is sandwiched between the objects A1 and A2, and adheres to the objects A1 and A2. Specifically, each adhesive surface of the adhesive section 112 of the adhesive sheet 110 is adhered to the objects A1 and A2, respectively. The pressure-sensitive adhesive sheet 110 of this embodiment exhibits rubber elasticity at normal temperature (about 10 to 30 ° C.).

  An anchor portion 116 exists at one end in the longitudinal direction of the adhesive sheet 110. The anchor portion 116, unlike the attaching portion 112, protrudes outside between the objects A1 and A2 and does not adhere to the object A1. In other words, the anchor 116 is exposed outside the objects A1 and A2. This state is realized by the fact that the length of the adhesive sheet 110 is longer than the object A1. In this embodiment, the length L in the longitudinal direction of the pressure-sensitive adhesive sheet 110 is longer than the length in the longitudinal direction of the rectangular object A1 when viewed from above. Therefore, when the adhesive sheet 110 is attached to the object A1 such that the longitudinal direction of the adhesive sheet 110 is along the longitudinal direction of the object A1, the anchor portion 116 protrudes from the attachment surface of the object A1. Note that the attaching portion 112 and the anchor portion 116 are separated by a straight line (a straight line orthogonal to the longitudinal direction of the adhesive sheet 110) corresponding to the outer contour of the object A1.

  A tab 150 is fixed to the other end of the adhesive sheet 110 in the longitudinal direction (an end opposite to the one end). The tab 150 has a substantially square shape when viewed from above. The tab 150 of this embodiment is a non-stretchable resin film, and its surface is non-adhesive. The tab 150 is fixed to the pressure-sensitive adhesive sheet 110 by being attached to the pressure-sensitive adhesive surface (both surfaces) at the end of the pressure-sensitive adhesive sheet 110.

  The area ratio of the anchor portion 116 in the adhesive sheet 110 is suitably 50% or less, and preferably 30% or less (for example, 20% or less, typically, from the viewpoint of sufficiently securing the area of the sticking portion 112). Is 10% or less). Therefore, the area ratio of the attaching section 112 is suitably 50% or more, and preferably 70% or more (for example, 80% or more, typically 90% or more). Further, from the viewpoint of preferably exhibiting the function of the anchor portion 116, the area ratio of the anchor portion 116 is appropriately set to 1% or more, and may be approximately 3% or more (for example, 5% or more). In that case, the area ratio of the attaching section 112 is appropriately set to 99% or less, and may be about 97% or less (for example, 95% or less).

  The ratio (L / W) of the length L to the width W of the adhesive sheet 110 is preferably 1 or more. The pressure-sensitive adhesive sheet 110 having such a shape can exhibit a good adhesion function to a rectangular adherend (for example, a battery or the like). Further, it is more preferable that the adhesive sheet 110 has a band shape (typically a rectangular shape) as in the present embodiment. In this case, the pressure-sensitive adhesive sheet having the above ratio (L / W) of about 2 or more (typically 3 or more, for example, 5 or more) depends on the shape and size of the adherend and the place where the adherend is attached. It tends to be excellent in handling. Although the upper limit of the ratio (L / W) is not particularly limited, the ratio (L / W) can be about 50 or less (for example, 30 or less, typically 20 or less) from the viewpoint of strength, handleability, and the like. .

  Further, in the length L of the adhesive sheet 110 having a band shape, the ratio (L1: L3) of the length L1 of the sticking portion 112 to the length L3 of the anchor portion 116 is determined by securing the bonding area in the sticking portion 112 and securing the anchor. From the viewpoint of compatibility with the removal workability by the part 116, the ratio is appropriately set to 99: 1 to 50:50, preferably 97: 3 to 60:40 (for example, 95: 5 to 70:30, typically Is 90:10 to 80:20). In addition, L3 is suitably about 1 mm or more, preferably 3 mm or more, more preferably 5 mm or more (for example, 10 mm or more). It is appropriate that L2 is 30 mm or less (for example, 20 mm or less).

  In the above-described embodiment, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with tabs has a band shape, but the shape of the pressure-sensitive adhesive sheet disclosed herein is not limited to this. The pressure-sensitive adhesive sheet may have, for example, a square shape, or may have a band-like portion in part. The pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above-described embodiment, but is not limited thereto, and may have a shape extending in a curved shape or a shape having a straight line and a curved line (for example, a U-shape). Or a U-shape, arc shape, wavy shape, zigzag shape, or the like.

  In the above embodiment, the pressure-sensitive adhesive sheet as a whole exhibits rubber elasticity at room temperature (about 10 to 30 ° C.), but the material and configuration of the pressure-sensitive adhesive sheet are not limited to this. The pressure-sensitive adhesive sheet can be appropriately designed according to the purpose and the like within a range described later. In the case where the pressure-sensitive adhesive sheet has the property of being stretched by elastic deformation, the problem (damage of the adherend, collision of the adherend with the worker, etc.) due to the elastic rebound tends to be remarkable, but is disclosed herein. By applying such a technique (installation of an anchor portion), the above-mentioned problem can be solved. Therefore, by applying the technology disclosed here to the tab-attached product provided with the pressure-sensitive adhesive sheet having rubber elasticity, the effect of improving the removal workability can be particularly preferably exerted.

  Further, in the above-described embodiment, the attaching portion and the anchor portion are separated by a line orthogonal to the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The classification of the sticking part and the anchor part of the pressure-sensitive adhesive sheet can be determined according to the shape or the like of the object (adherend) to which the sticking part is stuck. In the technology disclosed herein, the sticking portion may typically be a portion that is entirely stuck to an adherend. On the other hand, the anchor portion is a portion where at least one surface (or both surfaces) is not attached to the adherend, and typically, one of two objects (the adherend) It may be a part that protrudes. The anchor part may be, for example, a part other than the sticking part in the adhesive sheet. The attachment portion and the anchor portion can have different colors by, for example, including a coloring material such as a pigment from the viewpoint of alignment with the adherend. Further, a line or a mark may be provided at the boundary between the two.

  Further, as described in the above embodiment, the anchor portion is a portion fixed to one of the two objects joined by the attaching portion. Fixing to an object is performed by attaching an anchor portion of an adhesive sheet to the object. Since the sticking basically involves an intentional act (typically, crimping), a temporarily fixed (temporarily fixed) state in which no pressure is applied is not considered to be stuck.

  Further, in the above embodiment, the anchor portion has adhesiveness on both surfaces, but the technology disclosed herein is not limited to this. The surface of the anchor portion and the surface of the attaching portion may be made of the same material (typically, an adhesive having the same composition) or may be made of different materials. One surface (exposed surface; surface opposite to the surface to be attached to one object) of the anchor portion may be non-adhesive or low-adhesive. Here, that the surface of the anchor portion has low adhesiveness means that the adhesive force (typically, peel strength with respect to SUS180 degrees) is lower than the surface of the sticking portion. For example, the surface of the anchor portion can be made non-adhesive or low-adhesive by applying powder to the adhesive surface of the anchor portion or covering the adhesive surface with a thin film such as a resin film. In addition, when the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet with a substrate, the pressure-sensitive adhesive layer is not formed on one side, or the formed pressure-sensitive adhesive layer is removed, so that one side of the anchor portion has non-adhesive or low adhesiveness. can do. In this case, the anchor portion may be configured as a single-sided adhesive sheet having no adhesive layer on one side.

  Further, in the above-described embodiment, the anchor portion is exposed from between the two objects. However, the present invention is not limited to this, and the anchor portion is in a state where the two objects are joined by the attaching portion. May exist between two objects. In that case, one surface of the anchor part is non-adhesive. Therefore, the anchor portion does not need to be exposed outside the object (the adherend).

  Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a process of making the surface of the pressure-sensitive adhesive sheet non-tacky or low-tacky. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the pressure-sensitive adhesive sheet having a band shape. In that case, the anchor part may be arranged between the tabs arranged on both ends and the sticking part.

<Adhesive product with tab (Reference Embodiment 3)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. FIG. 7 shows two adhesive products 201A and 201B with tabs for fixing objects (adherends) A1 and A2. In FIG. 7, the adhesive product with tab 201 </ b> A arranged upward includes an extensible adhesive sheet 210 and a tab 250 provided at an end of the adhesive sheet 210.

  The adhesive sheet 210 has a band shape. The adhesive sheet 210 is in a state of being sandwiched between the objects A1 and A2, and is adhered to the objects A1 and A2. Specifically, the pressure-sensitive adhesive sheet 210 of this embodiment has double-sided adhesiveness, and its respective adhesive surfaces are bonded to the objects A1 and A2, respectively.

  The strip shape of the adhesive sheet 210 has a bent portion 220. When viewed toward the attachment surface of the object A2 to which the adhesive sheet 210 is attached, it can be said that the adhesive sheet 210 has a band shape, and the band has the bent portion 220. In the adhesive sheet 210, three bent portions 220 are provided, and the adhesive sheet 210 other than the bent portion 220 extends linearly. Further, two portions of the bent portion 220 correspond to two corners that constitute the outer periphery of the surface (the adhered surface) of the object A1 having a rectangular shape. Thereby, the pressure-sensitive adhesive sheet 210 has a shape partially along the outer periphery of the surface of the object A1. Specifically, the adhesive sheet 210 has a U-shape toward the attachment surface.

  In the adhesive sheet 210, each bent portion 220 is bent in a curved shape (to draw an arc). In this embodiment, each bent portion 220 is bent at an almost right angle in an arc shape (in an R shape). By forming the bent portion 220 into a curved shape, when pulling the pressure-sensitive adhesive sheet 210, a problem such as breakage at the bent portion 220 as a starting point hardly occurs.

  One end (the end opposite to the end on which the tab 250 is provided) of the adhesive sheet 210 is a free end. Specifically, one end of the U-shape of the adhesive sheet 210 is a free end. By setting one end of the adhesive sheet 210 as a free end, the adhesive sheet 210 of the adhesive product with tab 201A and the adhesive sheet 210 of the adhesive product with tab 201B are continuous (tabs are provided at both ends of the U-shaped adhesive sheet). Peeling property (typically, peeling property by pulling) of the pressure-sensitive adhesive sheet is more likely to be improved than that of the pressure-sensitive adhesive product having the above configuration.

  A tab 250 is fixed to the other end of the adhesive sheet 210 in the longitudinal direction (an end opposite to the one end). The tab 250 has a substantially square shape when viewed from above. The tab 250 of this embodiment is a non-stretchable resin film, and its surface is non-adhesive. The tab 250 is fixed to the pressure-sensitive adhesive sheet 210 by being attached to the pressure-sensitive adhesive surface (both surfaces) at the end of the pressure-sensitive adhesive sheet 210.

  In FIG. 7, the adhesive product with a tab 201B arranged below has a different attachment position to the object A1, and the U-shape of the adhesive sheet 210 is opposite to the U-shape of the adhesive sheet 210 of the adhesive product with a tab 201A. Except for being convex in the direction, it has basically the same configuration as the tabbed adhesive product 201A. Therefore, duplicate description will be omitted.

  The adhesive product with tab 202 shown in FIG. 8 is a modified example of the above embodiment. The pressure-sensitive adhesive sheet 210 of the pressure-sensitive adhesive product 202 with tabs has three bent portions 220, and each bent portion 220 is formed at three corners forming the outer periphery of the surface (adhering surface) of the rectangular object A1. Yes, it is. Thereby, the pressure-sensitive adhesive sheet 210 has a shape along all sides (four sides) of the outer periphery of the surface of the rectangular object A1. The pressure-sensitive adhesive sheet 210 makes substantially one round inside the outer periphery of the surface of the rectangular object A1, but is not connected to the original pressure-sensitive adhesive sheet 210, and one end (end) is a free end. That is, the pressure-sensitive adhesive sheet 210 that has made a round along the outer periphery of the surface of the object A1 has a non-annular form. Other items are basically the same as those in the configuration shown in FIG.

  The adhesive product with tab 203 shown in FIG. 9 is also a modification of the above embodiment. The pressure-sensitive adhesive sheet 210 of the pressure-sensitive adhesive product 203 with a tab has a band shape extending in a curved shape. Specifically, the adhesive sheet 210 has a wavy shape. With this configuration, the pressure-sensitive adhesive sheet 210 can widely cover the surface of the adherend (object) (adhesion surface) with a small adhesion area. Other items are basically the same as those in the configuration shown in FIG.

  In addition, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with a tab has a band shape, but the band shape is not limited to the shape of the above embodiment. For example, the shape may be a U-shape, a U-shape, an arc shape, a wavy shape, or the like. Examples of the wave shape include a curved shape such as a sine wave, a pseudo sine wave, and an arc wave, and a non-curved shape such as a zigzag shape and a triangular wave. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Further, in the above embodiment, the bent portion of the pressure-sensitive adhesive sheet is a portion bent in a curved shape, but the technology disclosed herein is not limited to this. For example, the bent portion may not have a curved portion. Further, the bending angle of the bent portion is approximately 45 ° or more (for example, 70 ° or more, typically 90 ° or more), and the upper limit of the bending angle is 180 °. If the bend is bent at an angle of approximately 180 °, the bend may typically be curved (U-shaped). The number of bent portions in the adhesive sheet may be one or more, and may be two or more (for example, three or more).

  Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a process of making the surface of the pressure-sensitive adhesive sheet non-tacky or low-tacky. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the pressure-sensitive adhesive sheet having a band shape.

<Adhesive product with tab (Reference Embodiment 4)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. The tabbed adhesive product 301 shown in FIG. 10 includes an extensible adhesive sheet 310 and a tab 350 provided at an end of the adhesive sheet 310.

  The adhesive sheet 310 has a band shape. In the longitudinal direction, the pressure-sensitive adhesive sheet 310 has a portion where the width increases linearly as the distance from the tab 350 increases, starting from the tab 350. The pressure-sensitive adhesive sheet 310 reaches the maximum width at a substantially middle point in the longitudinal direction of the pressure-sensitive adhesive sheet 310, and then tapers as the distance from the tab 350 increases. More specifically, both sides (long sides) 310a and 310b in the longitudinal direction of the adhesive sheet 310 spread in the width direction as the distance from the tab 350 increases, and the adhesive sheet 310 reaches the maximum width. Thereafter, the both sides 310a and 310b are tapered and reach one end in the longitudinal direction of the adhesive sheet 310 (an end opposite to the end on which the tab 350 is provided; a free end). The maximum width of the adhesive sheet 310 is larger than the width of the tab 350. As a result, the tabbed adhesive product 301 has a relatively large bonding area to the objects (adherends) A1 and A2 compared to the width of the tab 350. Here, the "width of the tab" means a length (maximum length) in a direction orthogonal to the longitudinal direction of the pressure-sensitive adhesive sheet, unless otherwise specified.

  The adhesive sheet 310 is sandwiched between the objects A1 and A2, and is adhered to the objects A1 and A2. Specifically, the pressure-sensitive adhesive sheet 310 of this embodiment has double-sided adhesiveness, and the respective pressure-sensitive adhesive surfaces are bonded to the objects A1 and A2, respectively.

  A tab 350 is fixed to the other end of the adhesive sheet 310 in the longitudinal direction (an end opposite to the one end). The tab 350 has a substantially square shape when viewed from above. The tab 350 of this embodiment is a non-stretchable resin film, and its surface is non-adhesive. The tab 350 is fixed to the adhesive sheet 310 by being attached to the adhesive surface (both sides) at the end of the adhesive sheet 310.

  An adhesive product with tab 302 shown in FIG. 11 is a modification of the above embodiment. The pressure-sensitive adhesive sheet 310 of the pressure-sensitive adhesive product 302 with tabs is such that only one side (one side) 310 a in the longitudinal direction extends in a curved shape so that the width of the pressure-sensitive adhesive sheet 310 increases as the distance from the tab 350 increases. 310 has reached the maximum width. Thereafter, the one side 310a extends in a curved shape so as to reduce the width of the adhesive sheet 310, and one end in the longitudinal direction of the adhesive sheet 310 (an end opposite to the end on which the tab 350 is provided. End). In short, the one side 310a of the adhesive sheet 310 has an arc-shaped curve. On the other hand, the other side 310b in the longitudinal direction of the adhesive sheet 310 extends linearly and is along one side of the rectangular object A1. Other items are basically the same as those in the configuration shown in FIG.

  Although not specifically shown, as another modified example of the above embodiment, a pressure-sensitive adhesive product with a tab in which both sides (both sides) in the longitudinal direction of the pressure-sensitive adhesive sheet are curved is exemplified. Specifically, the pressure-sensitive adhesive sheet of the pressure-sensitive adhesive product with a tab reaches a maximum width by extending in a curved shape so that the width of the pressure-sensitive adhesive sheet increases as both sides (both sides) in the longitudinal direction move away from the tab. I have. Thereafter, the both sides extend in a curved shape so as to reduce the width of the pressure-sensitive adhesive sheet, and reach one end in the longitudinal direction of the pressure-sensitive adhesive sheet (an end opposite to the end on which the tab is provided; a free end). ing. In short, both sides of the pressure-sensitive adhesive sheet draw an arc-shaped curve. Other items are basically the same as those in the configuration shown in FIG.

  Further, although not specifically shown, as another modified example of the above embodiment, only one side (one side) in the longitudinal direction of the pressure-sensitive adhesive sheet extends linearly so that the width of the pressure-sensitive adhesive sheet changes as the distance from the tab increases. Tabbed adhesive products. Specifically, the pressure-sensitive adhesive sheet of this pressure-sensitive adhesive product with a tab reaches the maximum width by extending linearly so that the width of the pressure-sensitive adhesive sheet increases as only one side (one side) in the longitudinal direction moves away from the tab. are doing. Thereafter, the one side is tapered to reduce the width of the pressure-sensitive adhesive sheet, and reaches one end in the longitudinal direction of the pressure-sensitive adhesive sheet (an end opposite to the end on which the tab is provided; a free end). I have. In short, the above-mentioned one side of the pressure-sensitive adhesive sheet has a bent line in the shape of a letter C. On the other hand, the other one side in the longitudinal direction of the adhesive sheet extends linearly and is along one side of the rectangular object. Other items are basically the same as those in the configuration shown in FIG.

  Although not particularly shown in the adhesive products 301 and 302 with tabs, the surface of the tab 350 preferably has a concave step. This facilitates holding (typically gripping) the tab 350. In a preferred embodiment, the step may be formed by providing a hole in the tab 350. By providing a perforation substantially at the center of the surface of the tab 350 having a smooth surface, a configuration in which the tab 350 can be easily pulled is obtained.

  The width of the tab 350 is suitably about 90% or less of the width of the pressure-sensitive adhesive sheet 310 from the viewpoint of space saving, and is preferably 80% or less of the width of the pressure-sensitive adhesive sheet 310 (for example, 70% or less, Is 60% or less). In addition, from the viewpoint of the removability of the pressure-sensitive adhesive sheet, the tab 350 preferably has a width of about 30% or more of the width of the pressure-sensitive adhesive sheet 310, and preferably has a width of 50% or more of the width of the pressure-sensitive adhesive sheet 310. .

  The length of the tab 350 (the length in the direction along the longitudinal direction of the pressure-sensitive adhesive sheet 310) is not particularly limited, but is preferably about 50% or more of the width of the tab 350 from the viewpoint of the removability of the pressure-sensitive adhesive sheet. It is suitable and preferably has a length of at least 70% (eg, at least 90%) of the width of the tab 350. In addition, from the viewpoint of saving space, the length of the tab 350 is appropriately set to be approximately 200% or less of the width of the tab 350, and preferably 150% or less (for example, 100% or less) of the width of the tab 350. Having a length of

  In addition, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with a tab has a band shape, but the band shape is not limited to the shape of the above embodiment. For example, the band shape of the pressure-sensitive adhesive sheet can take a U-shape, a U-shape, an arc shape, a wavy shape, or the like. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Further, in the above embodiment, the width of the pressure-sensitive adhesive sheet changes as the distance from the tab increases, but the pressure-sensitive adhesive sheet is not limited to this, and may have a constant width. In addition, as for the one in which the width of the pressure-sensitive adhesive sheet changes as the distance from the tab increases, the pressure-sensitive adhesive sheet may have a constant width after the width increases and reaches the maximum width. Alternatively, the pressure-sensitive adhesive sheet may have a constant width for a while as the distance from the tab increases, and then increase. Further, in the above-described embodiment, the pressure-sensitive adhesive sheet has a portion that tapers as the distance from the tab increases, but the tapering portion may not be provided.

  Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a process of making the surface of the pressure-sensitive adhesive sheet non-tacky or low-tacky. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the band-shaped pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the pressure-sensitive adhesive sheet having a band shape.

<Adhesive product with tab (Reference Embodiment 5)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. The adhesive product with tab 401 shown in FIG. 12 includes an extensible adhesive sheet 410 and a tab 450. The adhesive sheet 410 has two adhesive sheet pieces 430a and 430b as portions extending from the tab 450.

  The adhesive sheet 410 is sandwiched between the objects (adherends) A1 and A2, and is adhered to the objects A1 and A2. Specifically, the pressure-sensitive adhesive sheet 410 of this embodiment has double-sided adhesiveness, and its respective adhesive surfaces are bonded to the objects A1 and A2, respectively. Therefore, the pressure-sensitive adhesive sheet pieces 430a and 430b constituting the pressure-sensitive adhesive sheet 410 are also sandwiched between the objects A1 and A2, and the respective pressure-sensitive adhesive surfaces are adhered to the objects A1 and A2.

  Each of the adhesive sheet pieces 430a and 430b has a band shape extending linearly. One end of each of the adhesive sheet pieces 430a and 430b in the longitudinal direction is fixed to a tab 450. The pressure-sensitive adhesive sheet pieces 430a and 430b are separately arranged at predetermined intervals. Specifically, the adhesive sheet pieces 430a and 430b are parallel. With this arrangement, the pressure-sensitive adhesive sheet pieces 430a and 430b adhere along the inside of the long side of the surface of the object A1 on the surface of the object A1 having a rectangular shape (adhering surface), and exhibit a good adhesive function. The adhesive sheet pieces 430a and 430b extend from the tab 450 in the same direction (left direction of the tab 450 in FIG. 12), and when the tab 450 is pulled in a predetermined direction (right direction in FIG. 12), Each of the adhesive sheet pieces 430a and 430b is arranged to extend in the longitudinal direction. With this arrangement, when the tab 450 is pulled to release the joining of the objects A1 and A2 by the adhesive sheet 410 (here, the adhesive sheet pieces 430a and 430b), the two adhesive sheet pieces 430a and 430b are pulled by the pulling operation. It extends in the longitudinal direction and peels off from the objects A1 and A2.

  The tab 450 has a substantially rectangular shape when viewed from above. The longitudinal direction of the tab 450 is substantially orthogonal to the longitudinal direction of the adhesive sheet pieces 430a and 430b to which the tab 450 is fixed, and the tab 450 and the adhesive sheet pieces 430a and 430b are connected in this state. The adhesive sheet pieces 430a and 430b are connected to the tab 450 at predetermined intervals in the longitudinal direction of the tab 450. The tab 450 of this embodiment is a non-stretchable resin film, and its surface is non-adhesive. The tab 450 is fixed to the adhesive sheet pieces 430a and 430b by being attached to the adhesive surfaces (both sides) at the ends of the adhesive sheet pieces 430a and 430b.

  The adhesive product with tab 402 shown in FIG. 13 is a modified example of the above embodiment. The adhesive product with tab 402 is used to join two members M1 and M2 such as a battery (which may be a polymer battery) to a base material S such as a portable electronic device body. Specifically, the pressure-sensitive adhesive sheet piece 430a constituting the pressure-sensitive adhesive sheet 410 of the pressure-sensitive adhesive product 402 with tabs is used for bonding the base material S and the member M1, and is located between the base material S and the member M1. It is bonded to the material S and the member M1. The pressure-sensitive adhesive sheet piece 430b constituting the pressure-sensitive adhesive sheet 410 is used for bonding the base material S and the member M2, and is adhered to the base material S and the member M2 between the base material S and the member M2. I have. At one end in the longitudinal direction of each of the adhesive sheet pieces 430a and 430b, adhesive sheet piece fixing portions 452a and 452b (described later) of the tab 450 are fixed, respectively.

  The tab 450 is composed of adhesive sheet piece fixing portions 452a and 452b connected in a separable state from each other. Specifically, the tab 450 having a rectangular shape has a separation line 454 substantially at an intermediate line in the longitudinal direction. Here, the intermediate line refers to a line located in the middle of the tab 450 in the longitudinal direction and orthogonal to the longitudinal direction. The tab 450 is located on one side of the separation line 454 (upper in FIG. 13), and on the other side of the separation line 454 (lower in FIG. 13). And an adhesive sheet piece fixing portion 452b. The adhesive sheet piece fixing portions 452a and 452b are both continuous (connected) as tabs 450, but can be separated by a separation line 454. In this embodiment, the perforations are formed in the separation line 454, so that the adhesive sheet piece fixing portions 452a and 452b are separably connected. With the above configuration, for example, when the joining between the base material S and the member M1 is to be maintained but the joining between the base material S and the member M2 is to be released, the adhesive sheet piece fixing portions 452a and 452b are connected to the separation line 454. Then, only the bonding between the base material S and the member M2 can be released by pulling only the adhesive sheet piece fixing portion 452b.

  When the pressure-sensitive adhesive sheet pieces 430a and 430b constituting the pressure-sensitive adhesive sheet 410 have a band shape (typically a rectangular shape), the width of each of the pressure-sensitive adhesive sheet pieces 430a and 430b is 30 mm or less (for example, 20 mm or less, typically 15 mm or less). For example, when the tabbed adhesive products 401 and 402 are used in a portable electronic device, the above width can be preferably adopted. When each of the pressure-sensitive adhesive sheet pieces 430a and 430b has a breaking strength equal to or more than a predetermined value, the width can be set to 10 mm or less (for example, 5 mm or less, and further 3 mm or less). In addition, from the viewpoint of preventing damage such as breakage at the time of pulling and removing, the width of each of the adhesive sheet pieces 430a and 430b is preferably 1 mm or more (for example, 3 mm or more, typically 5 mm or more), and preferably 10 mm or more. More preferably (for example, 12 mm or more). The width of the plurality of pressure-sensitive adhesive sheet pieces may be the same or different.

  When the pressure-sensitive adhesive sheet pieces 430a and 430b have a band shape (typically a rectangular shape), the length is not particularly limited, and is, for example, 1 cm or more (e.g., 3 cm or more, typically Is preferably 5 cm or more). Further, from the viewpoint of removal workability, the length of the pressure-sensitive adhesive sheet pieces 430a and 430b is preferably 30 cm or less (for example, 15 cm or less, and more preferably 5 cm or less). The lengths of the plurality of pressure-sensitive adhesive sheet pieces may be the same or different.

  When the tab 450 has a rectangular shape as in the above-described embodiment, the length is not particularly limited, and is preferably about 10 mm or more, and 15 mm or more (depending on the width and number of the adhesive sheet pieces). For example, it may be 20 mm or more, typically 30 mm or more. In addition, from the viewpoint of space saving around the adherend, the length of the tab 450 is suitably about 100 mm or less (for example, 80 mm or less, typically 50 mm or less).

  In the above-described embodiment, the pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with tabs has double-sided adhesiveness and consists of a plurality of pressure-sensitive adhesive sheet pieces having a band shape. Is not limited to this. The pressure-sensitive adhesive sheet may not be composed of separated pressure-sensitive adhesive sheet pieces, and may have two or more pressure-sensitive adhesive sheet portions (portions extending from the tabs) having a continuous structure. In this case, the portion extending from the tab can exhibit the same function as the adhesive sheet piece. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Further, the shape of the pressure-sensitive adhesive sheet piece (a part of the pressure-sensitive adhesive sheet) is not limited to the shape of the above embodiment. For example, the pressure-sensitive adhesive sheet piece (a part of the pressure-sensitive adhesive sheet) may have a square shape, or may have a band-shaped portion in part. The pressure-sensitive adhesive sheet piece typically has a shape extending linearly as in the above embodiment, but is not limited to this, and has a shape extending in a curved shape or a shape having a straight line and a curved line (for example, Shape, U-shape, arc shape, wavy shape, zigzag shape, etc.). The plurality of pressure-sensitive adhesive sheet pieces may have the same shape or may have different shapes.

  In the above embodiment, two pressure-sensitive adhesive sheet pieces are used, but the present invention is not limited to this. The number of pressure-sensitive adhesive sheet pieces may be two or more (for example, three or more). Therefore, the number of members to which the pressure-sensitive adhesive sheet pieces are attached may be three or more.

  Further, in the above embodiment, the two pressure-sensitive adhesive sheet pieces (parts of the pressure-sensitive adhesive sheet) each have a band shape extending linearly and are arranged in parallel with each other, but the pressure-sensitive adhesive sheet pieces according to the technology disclosed herein. The arrangement of (a part of the adhesive sheet) is not limited to the arrangement of the above embodiment. The plurality of pressure-sensitive adhesive sheet pieces (part of the pressure-sensitive adhesive sheet) can be arranged in various ways as long as they can be peeled off from the adherend when the tab is pulled. In a preferred embodiment, each pressure-sensitive adhesive sheet piece is arranged such that the longitudinal direction of each pressure-sensitive adhesive sheet piece extends when the tab is pulled. For example, in the case of a pressure-sensitive adhesive sheet piece having a band shape, the intersection angle (sub-angle) of the plurality of pressure-sensitive adhesive sheet pieces can be in a range from approximately 0 ° (that is, parallel) to 180 °. The arrangement according to one aspect is an arrangement in which a plurality of pressure-sensitive adhesive sheet pieces extend radially from the tab. As another aspect, there is an arrangement in which a plurality of pressure-sensitive adhesive sheet pieces extend from the tab in the same direction. The same direction typically indicates that a plurality of pressure-sensitive adhesive sheet pieces are substantially parallel to each other, but the other pressure-sensitive adhesive sheet pieces are 0 ° to less than 90 ° (preferably one pressure-sensitive adhesive sheet piece). Extends from 0 ° to 45 °, or even 0 ° to 30 °).

  In the above embodiment, the tab is a rectangular resin film. However, the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a process of making the surface of the pressure-sensitive adhesive sheet non-tacky or low-tacky. In the above embodiment, the tab is fixed to one end in the longitudinal direction of the strip of pressure-sensitive adhesive sheet. However, the present invention is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, tabs may be provided at both ends in the longitudinal direction of the strip of pressure-sensitive adhesive sheet. In addition, the intersection angle (sub-angle) between the tab and the pressure-sensitive adhesive sheet piece (part of the pressure-sensitive adhesive sheet) was substantially 90 ° in the above embodiment, but is not particularly limited thereto. It can be in a range of about 30 to 150 ° (for example, 45 to 135 °, further 60 to 120 °).

  Further, in the above modified example, the tab has a plurality of pressure-sensitive adhesive sheet piece fixing portions connected so as to be separable by separation lines, but the pressure-sensitive adhesive sheet piece fixing portion and the separation line may not be provided. In the case where the adhesive sheet piece fixing portion and the separation line are provided, their structures are not limited to the structure of the above embodiment. By appropriately adopting a conventionally known technique, adjacent pressure-sensitive adhesive sheet piece fixing portions can be connected in a separable state. The position of the separation line does not have to be in the middle of the longitudinal direction of the tab, and an appropriate position can be selected according to the arrangement position and the number of the adhesive sheet piece fixing portions. Further, the number of the adhesive sheet piece fixing portions may be two or more (for example, three or more).

<Characteristics of adhesive products with tabs>
In the case of an adhesive product with a tab, when the tab is fixed to the adhesive sheet by attaching the tab to the adhesive surface of the adhesive sheet, the tab fixing surface of the adhesive sheet before fixing the tab (adhesion with the tab is planned) Surface (positionally, the pressure-sensitive adhesive surface at the end of the pressure-sensitive adhesive sheet) is preferably highly smooth from the viewpoint of adhesion to the tab. Specifically, the surface roughness Ra of the tab fixing surface of the pressure-sensitive adhesive sheet is preferably less than 10.0 μm. The Ra is more preferably less than 5.0 μm, and still more preferably less than 1.0 μm. In this specification, the surface roughness Ra refers to an arithmetic average surface roughness Ra, and a general surface roughness measuring device (for example, a non-contact 3 made by Veeco) according to JIS Z0237: 2000. This is a value measured in an appropriate range (preferably in a measurement range of 5 mm × 5 mm) using a three-dimensional surface shape measuring device, model “Wyko NT-3300”).

  In addition, the tab fixing surface of the pressure-sensitive adhesive sheet preferably has a peel strength of about 1 N / 20 mm or more (180 ° peel strength with respect to a stainless steel plate) from the viewpoint of adhesion to the tab. The peel strength is preferably 3 N / 20 mm or more, more preferably 5 N / 20 mm or more (for example, 6 N / 20 mm or more, typically 6.5 N / 20 mm or more). The peel strength is measured by the following method. An adhesive sheet cut to a size of 20 mm in width and 100 mm in length is prepared. Under an environment of 23 ° C. and 50% RH, the adhesive surface of the adhesive sheet (typically a double-sided adhesive sheet) is exposed, and the adhesive surface is placed on a stainless steel plate (SUS plate) with a 2 kg roller. Reciprocate and crimp. After leaving it for 30 minutes in the same environment, the peel strength [N / 20 mm width] using a tensile tester at a tensile speed of 300 mm / min and a peel angle of 180 ° according to JIS Z 0237: 2000. Is measured. When the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet, a 25-μm-thick polyethylene terephthalate (PET) film may be bonded to the other pressure-sensitive adhesive surface, and the measurement may be performed by pressing the pressure-sensitive adhesive surface to be measured to a SUS plate. As the tensile tester, a universal tensile / compression tester (product name “TG-1kN”, manufactured by Minebea) can be used.

  Further, the tab fixing surface of the pressure-sensitive adhesive sheet preferably exhibits a shear adhesive force of about 0.2 MPa or more from the viewpoint of the adhesion to the tab. The shear adhesive strength is preferably 0.5 MPa or more, more preferably 0.8 MPa or more (for example, 1.0 MPa or more, typically 1.2 MPa or more). The shear adhesive strength is measured by a method described later.

  It is also preferable that the surface of the tab to which the pressure-sensitive adhesive sheet is attached before being attached to the pressure-sensitive adhesive sheet is highly smooth from the viewpoint of adhesion to the pressure-sensitive adhesive sheet. Specifically, the surface roughness Ra of the pressure-sensitive adhesive sheet attachment surface of the tab before fixing to the pressure-sensitive adhesive sheet is preferably less than 5.0 μm. The Ra is more preferably less than 3.0 μm, further preferably less than 1.0 μm.

<Pull out of adhesive product with tab>
The tabbed pressure-sensitive adhesive product disclosed herein is excellent in the ability to be removed by pulling out from between objects (pull-out removal property). Here, the pull-out removability means that an object is obtained by exposing a tab of an adhesive product from two objects fixed across an adhesive sheet of an adhesive product with a tab, pulling the exposed tab, and pulling out the adhesive sheet. Refers to the ease of removal such as release of fixing (typically joining). In addition, two objects may be two places of one member. Hereinafter, a more specific description will be given with reference to FIGS.

  FIG. 14 is a schematic side view for explaining one mode of pull-out (typically, pull-out), and FIG. 14 (a) is a diagram showing a state in which the pull-off of the tabbed adhesive product is started. (B) is a diagram showing a state in which the tab is pulled to remove, and (c) is a diagram showing a state in which the pull-off of the adhesive product with the tab is completed. FIG. 15 is a schematic top view for explaining one mode of pull-out (typically, pull-out), wherein (a) to (c) correspond to (a) to (c) of FIG. It is a corresponding figure.

  As shown in FIG. 14A and FIG. 15A, an adhesive product with tabs (double-sided adhesive sheet) 600 joins an adhesive sheet 610 for joining objects A1 and A2 and objects A1 and A2. A tab 650 that is exposed to the outside when performing the operation. The object A1 is joined to the object A2 using the adhesive sheet 610. Then, when it is desired to release the joined state between the objects A1 and A2 for the purpose of repair, replacement, and the like, the adhesive sheet 610 of the adhesive product 600 with a tab is pulled out from between the objects A1 and A2. Specifically, the tab-attached adhesive product 600 is pulled so that the tab 650 is pinched with a finger and pulled out from between the objects A1 and A2. Then, the extensible pressure-sensitive adhesive sheet 610 starts to elongate, contracts in a direction perpendicular to the pulling direction, and starts to peel off from the objects A1 and A2 (see FIG. 14 (b) and FIG. 15 (b)). Finally, the entire adhesive area of the adhesive sheet 610 is peeled off, and the pulling out of the adhesive sheet 610 from between the objects A1 and A2 is completed (see (c) of FIG. 14 and (c) of FIG. 15). Removal of the object A1 joined to the object A2 is also completed at the same time.

<Structure of adhesive sheet>
The pressure-sensitive adhesive sheet constituting the pressure-sensitive adhesive product with a tab disclosed herein is, for example, a pressure-sensitive adhesive sheet with a substrate having a pressure-sensitive adhesive layer on at least one surface (preferably both surfaces) of a film-shaped substrate (support). is there. Here, the concept of the pressure-sensitive adhesive sheet may include what is called a pressure-sensitive adhesive tape, a pressure-sensitive adhesive label, a pressure-sensitive adhesive film, or the like. The pressure-sensitive adhesive sheet disclosed herein may be in the form of a roll or a sheet. Alternatively, the pressure-sensitive adhesive sheet may be a form processed into various shapes.

  The pressure-sensitive adhesive sheet disclosed herein may have, for example, a cross-sectional structure schematically shown in FIG. The pressure-sensitive adhesive sheet 710 shown in FIG. 16 is provided with pressure-sensitive adhesive layers 721 and 722 on each surface (all of which are non-peelable) of the film-shaped substrate 720. The pressure-sensitive adhesive sheet 710 before use has a configuration in which each surface (each pressure-sensitive adhesive surface) of the pressure-sensitive adhesive layers 721 and 722 is protected by a release liner (not shown). Alternatively, the pressure-sensitive adhesive sheet disclosed herein may be a substrate-less double-sided pressure-sensitive adhesive sheet composed of only a pressure-sensitive adhesive layer, although not particularly shown.

  Further, it is preferable that the pressure-sensitive adhesive sheet has a long portion (a band-like portion or a rectangular portion; the same applies hereinafter) from the viewpoint of removability by pulling. Thereby, in the pressure-sensitive adhesive sheet stuck to the adherend, it is possible to preferably pull and remove the pressure-sensitive adhesive sheet from the adherend by gripping and pulling one end in the longitudinal direction of the elongated portion. . The shape of the elongate portion is typically a band. From the viewpoint of removability by pulling, the elongated portion may have a shape that tapers toward one end in the longitudinal direction. In a more preferred embodiment, the pressure-sensitive adhesive sheet is typically formed in a long shape.

<Size of adhesive sheet>
When the pressure-sensitive adhesive sheet disclosed herein has a long shape (a band shape or a rectangular shape, the same applies hereinafter) when used, the width thereof is about 30 mm or less (for example, 20 mm or less, typically 15 mm or less). Can be configured. For example, when the adhesive product with a tab is used in a portable electronic device, the above width can be preferably adopted. When the pressure-sensitive adhesive sheet has a breaking strength equal to or more than a predetermined value, its width can be set to 10 mm or less (for example, 5 mm or less, and further 3 mm or less). In addition, from the viewpoint of preventing damage such as breakage at the time of tensile removal, the width of the pressure-sensitive adhesive sheet is preferably 1 mm or more (for example, 3 mm or more, typically 5 mm or more), and preferably 10 mm or more (for example, 12 mm or more). Is more preferable.

  When the pressure-sensitive adhesive sheet disclosed herein has a long shape, the length is preferably 1 cm or more (for example, 3 cm or more, typically 5 cm or more) from the viewpoint of workability of removal by pulling. In addition, from the viewpoint of removal workability, the length of the pressure-sensitive adhesive sheet is preferably 30 cm or less (for example, 15 cm or less, typically 5 cm or less).

  The total thickness of the pressure-sensitive adhesive sheet (including the pressure-sensitive adhesive layer and the base material, but not including the release liner) disclosed herein is not particularly limited, and is in a range of approximately 20 μm to 5 mm (for example, 40 to 1000 μm). Is appropriate. The total thickness of the pressure-sensitive adhesive sheet is preferably about 50 to 300 μm (e.g., 70 to 200 μm) in consideration of pressure-sensitive properties and the like. When the total thickness of the pressure-sensitive adhesive sheet is equal to or less than a predetermined value, it may be advantageous in terms of making the product thinner, smaller, lighter, and resource saving. In another preferred embodiment, the total thickness of the pressure-sensitive adhesive sheet may be 80 μm or more (eg, 100 μm or more, typically 130 μm or more), and may be more than 150 μm (eg, more than 300 μm, typically more than 500 μm). You may. The pressure-sensitive adhesive sheet having such a total thickness can be preferably applied to, for example, affixing it to a wall surface or the like and fixing an object to be replaced after being used for a predetermined period of time.

<Characteristics of adhesive sheet>
The pressure-sensitive adhesive sheet disclosed herein preferably has a shear adhesive strength of 0.5 MPa or more. Thereby, the adhesive sheet adheres well to the adherend. Since the pressure-sensitive adhesive sheet having the above-mentioned adhesive force shows a strong stress against a force that tends to shift the adhesive interface (that is, a shear force), it can be a highly reliable bonding means in a usage mode exposed to the shear force. . More preferably, the shear adhesive strength is 0.8 MPa or more (for example, 1.0 MPa or more, typically 1.2 MPa or more). The upper limit of the shear adhesive strength is not particularly limited. However, if the shear adhesive strength is too high, the tensile removability and the adhesive residue prevention property tend to decrease, so that 5 MPa or less (for example, 3 MPa or less, typically 1.MPa). 5 MPa or less).

  The measurement of the shear adhesive strength can be performed by the method described below. A measurement sample is prepared by cutting an adhesive sheet (typically a double-sided adhesive sheet) into a size of 20 mm × 20 mm. In an environment of 23 ° C. and 50% RH, each of the adhesive surfaces of the measurement sample is overlapped on the surfaces of two stainless steel plates, respectively, and pressure-bonded by reciprocating a 2 kg roller once. After leaving it for 30 minutes in the same environment, the shear adhesive strength [MPa] is measured using a tensile tester under the conditions of a tensile speed of 300 mm / min and a peel angle of 0 °. Specifically, as shown in FIG. 17, one adhesive surface 800A of the measurement sample 800 is attached to a stainless steel plate 801 and the other adhesive surface 800B of the measurement sample 800 is attached to a stainless steel plate 802 and pressed. This is pulled in the direction of the arrow in FIG. 17 (that is, the shear direction) at the above-mentioned speed, and the peel strength per 20 mm × 20 mm is measured. The shear adhesive strength [MPa] is determined from the obtained value. In the case of a single-sided pressure-sensitive adhesive sheet (single-sided pressure-sensitive adhesive sheet), the non-adhesive surface of the sheet is fixed to a stainless steel plate with an adhesive or the like, and the other measurement may be performed in the same manner as described above. As the tensile tester, a universal tensile / compression tester (product name “TG-1kN”, manufactured by Minebea) can be used.

  The pressure-sensitive adhesive sheet disclosed herein preferably has an initial pressure A on PC (polycarbonate) of 3 N / 20 mm or more. Thereby, it is possible to preferably exhibit a sufficient adhesive function to an adherend formed from various materials such as PC. Further, when the pressure-sensitive adhesive sheet having the initial adhesive force A is used, for example, in a portable electronic device, the fixed arrangement of the adhered member can be maintained even when the portable electronic device falls. The initial adhesive force A is more preferably 5 N / 20 mm or more (for example, 6 N / 20 mm or more, typically 6.5 N / 20 mm or more). The upper limit of the initial adhesive force A is not particularly limited, but may be less than 15 N / 20 mm (for example, less than 12 N / 20 mm, typically less than 10 N / 20 mm) in consideration of the pull-out property and the adhesive residue prevention property. preferable.

  The measurement of the initial adhesive force A can be performed by the following method. An adhesive sheet cut to a size of 20 mm in width and 100 mm in length is prepared. Under an environment of 23 ° C. and 50% RH, the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet (typically a double-sided pressure-sensitive adhesive sheet) is exposed, and the pressure-sensitive adhesive surface is pressure-bonded to the surface of the PC board by reciprocating a 2 kg roller once. I do. After leaving it for 30 minutes in the same environment, the peel strength [N / 20 mm width] using a tensile tester at a tensile speed of 300 mm / min and a peel angle of 180 ° according to JIS Z 0237: 2000. Is measured. When the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet, a 25-μm-thick polyethylene terephthalate (PET) film may be stuck to the other pressure-sensitive adhesive surface, and then the pressure-sensitive adhesive surface to be measured may be pressure-bonded to a PC plate for measurement. As the tensile tester, a universal tensile / compression tester (product name “TG-1kN”, manufactured by Minebea) can be used.

  The pressure-sensitive adhesive sheet disclosed herein preferably has a tensile peeling stress B for PC of 22 N / 20 mm or less. Accordingly, when the pressure-sensitive adhesive sheet is pulled from the adherend in the pull-peeling direction, the pressure-sensitive adhesive sheet can be more smoothly removed from the adherend. The tensile peeling stress B is more preferably 20 N / 20 mm or less (for example, 19 N / 20 mm or less, typically 18 N / 20 mm or less). Although the lower limit of the tensile peeling stress B is not particularly limited, it is appropriate to be about 5 N / 20 mm or more (for example, 8 N / 20 mm or more, typically 10 N / 20 mm or more) from the relationship with the initial adhesive strength A. .

  The measurement of the tensile peel stress B can be performed by the following method. An adhesive sheet is cut into a size of 20 mm in width and 120 mm in length to prepare a measurement sample. In an environment of 23 ° C. and 50% RH, each adhesive surface of the measurement sample (typically a double-sided adhesive sheet) is superimposed on the surface of two PC boards (thickness of 30 mm × 100 mm × 2 mm) to obtain 2 kg of each. The roller is reciprocated once and pressed. A 70 mm portion (that is, 20 mm × 70 mm) from one end in the longitudinal direction of the measurement sample is pressure-bonded to each PC board. After leaving this for 30 minutes in the same environment, the two PC boards were fixed using a tensile tester, and the peel strength [N / 20 mm width] under the conditions of a tensile speed of 300 mm / min and a peel angle of 0 °. ] Is measured. Specifically, as shown in FIG. 18, each of the adhesive surfaces 800A and 800B of the adhesive sheet measurement sample 800 is bonded to two PC boards 811 and 812 and pressed. This is pulled at the above-mentioned speed in the direction of the arrow in FIG. 18 (that is, in the direction of tensile peeling), and the peel strength [N / 20 mm width] is measured. In the case of a single-sided pressure-sensitive adhesive sheet (one-sided pressure-sensitive adhesive sheet), the peel strength [N / 20 mm width] may be measured in the same manner as described above, except that the one pressure-sensitive adhesive surface is fixed to one PC board. As the tensile tester, a universal tensile / compression tester (product name “TG-1kN”, manufactured by Minebea) can be used.

  In a preferred embodiment, the ratio (B / A) of the tensile peel stress B [N / 20 mm] to the initial adhesive strength A [N / 20 mm] is 3.0 or less. Thereby, it is possible to preferably achieve both a sufficient adhesive function at the time of use and excellent tensile removability at the time of removal. The ratio (B / A) is preferably 2.8 or less (for example, 2.6 or less, typically 2.4 or less). The ratio (B / A) is ideally preferably as low as possible, but in practice, its lower limit may be, for example, about 1.2 or more (typically 1.5 or more).

  In a preferred embodiment, the pressure-sensitive adhesive sheet has a breaking strength of 10 MPa or more. Thus, for example, in a configuration showing an adhesive strength equal to or higher than a predetermined value, a configuration in which damage such as a breakage occurs when the adhesive sheet is removed can be obtained. Also, it tends to have excellent workability. The breaking strength is more preferably 20 MPa or more, and still more preferably 30 MPa or more (for example, 45 MPa or more, typically 60 MPa or more). From the viewpoint of the elasticity and extensibility of the pressure-sensitive adhesive sheet, the breaking strength is preferably about 100 MPa or less (for example, 80 MPa or less, typically 70 MPa or less).

  The breaking strength is measured according to the method for measuring “tensile strength” described in JIS K 7311: 1995. More specifically, the breaking strength can be measured using a No. 3 dumbbell-shaped test piece (5 mm in width) at a tensile speed of 300 mm / min. As the tensile tester, a product name "Autograph AG-10G type tensile tester" manufactured by Shimadzu Corporation can be used. At the time of the test, it is preferable to apply powder to the adhesive surface to remove the influence of the adhesive stickiness. The tensile direction in the above test is not particularly limited, but when the pressure-sensitive adhesive sheet is long, it is preferable to match the longitudinal direction. The breaking strength can be adjusted, for example, by selecting a base material.

  In a preferred embodiment, the breaking strength [MPa] of the pressure-sensitive adhesive sheet is 5 times or more (eg, 10 times or more, typically 30 times or more) of the shear adhesive strength [MPa]. Thereby, when the adhesive sheet is pulled and removed, damage such as breakage can be more reliably prevented.

  The pressure-sensitive adhesive sheet disclosed herein preferably has an elongation at break of 300% or more. Thereby, the tension and the deformation of the pressure-sensitive adhesive sheet interact with each other, and excellent tensile removability (particularly, shear removability) is realized. The elongation at break is more preferably 500% or more (for example, 700% or more, typically 800% or more). The upper limit of the elongation at break is not particularly limited, but may be, for example, about 1000% or less (typically 900% or less) from the viewpoint of removal workability and the like.

  The elongation at break is measured in accordance with the “elongation” measuring method described in JIS K 7311: 1995. More specifically, the elongation at break can be measured using a No. 3 dumbbell-shaped test piece (width 5 mm, mark interval 20 mm) under the condition of a tensile speed of 300 mm / min. The tensile tester and others are basically the same as in the case of the breaking strength described above. The tensile direction in the above test is not particularly limited, but when the pressure-sensitive adhesive sheet is long, it is preferable to match the longitudinal direction. The elongation at break can be adjusted, for example, by selecting a base material.

  The pressure-sensitive adhesive sheet disclosed herein preferably has a 100% modulus of less than 10 MPa. When the 100% modulus of the pressure-sensitive adhesive sheet is less than the predetermined value, when the pressure-sensitive adhesive sheet is stretched to be deformed and removed from the adherend, the resistance at the start of pulling tends to be small, and there is a tendency that the pressure-sensitive removability is excellent. The 100% modulus is more preferably less than 5 MPa. Although the lower limit of the 100% modulus is not particularly limited, it is usually suitable to be 0.5 MPa or more (for example, 1 MPa or more) from the viewpoint of the workability of sticking the pressure-sensitive adhesive sheet.

  The 100% modulus is measured according to the method for measuring “tensile stress” described in JIS K 7311: 1995. More specifically, using a No. 3 dumbbell-shaped test piece (width 5 mm, mark interval 20 mm), the sample was pulled at a tensile speed of 300 mm / min, and the stress [MPa when the mark length was extended 100%. ] Is set to 100% modulus. As the tensile tester, a product name "Autograph AG-10G type tensile tester" manufactured by Shimadzu Corporation can be used. The 100% modulus of the pressure-sensitive adhesive sheet can be adjusted by, for example, selection of the type of the base material (selection of the mixing ratio of the hard component and the soft component, etc.) and the molding method.

  In a preferred embodiment, the pressure-sensitive adhesive sheet suitably exhibits a tensile recovery of more than 50%. More preferably, the tensile recovery rate is 70% or more. The tensile recovery is more preferably 80% or more (for example, 90% or more, typically 93% to 100%). Thereby, damage such as shredding at the time of removing the adhesive sheet can be more highly prevented. This will be described. For example, when the pressure-sensitive adhesive sheet is removed by being pulled in the shearing direction, it usually takes some time depending on the adhesion area and the like. Therefore, the removal operation may be interrupted on the way. In such a case, if the tensile recovery rate of the pressure-sensitive adhesive sheet is equal to or less than a predetermined value, the removing operation may be restarted from a state where the mechanical properties (strength, elasticity, etc.) are reduced by the tension before the interruption of the operation. At that time, the pressure-sensitive adhesive sheet cannot withstand the tension at the time of resuming the removing operation, and is liable to be damaged such as being cut off. Even when the pressure-sensitive adhesive sheet showing the tensile recovery rate is removed in such a manner as to be interrupted once as described above, since the reduction in mechanical properties is suppressed by the recovery after pulling, the damage is higher. Can be prevented.

The measurement of the tensile recovery rate is performed by the following method.
[Measurement of tensile recovery rate]
Per adhesive sheet, performing a tensile test stretching specific section distance L ₀ of the adhesive sheet 100%. After stretching the pressure-sensitive adhesive sheet of 100%, the length of the specific section is taken as _{L 1} after the lapse of 5 minutes to release the formula: tensile recovery ratio _{(%) = L 0 / L} 1 × 100; from Determine the tensile recovery.
More specifically, in accordance with JIS K 7311: 1995, 100% elongation is performed using a No. 3 dumbbell-shaped test piece (width: 5 mm, mark interval: 20 mm) at a tensile speed of 300 mm / min. In other words, it is pulled until the mark line interval is extended by 20 mm. Then, the length L ₁ (marked line interval: mm) after 5 minutes from the release from the tension is measured, and the tension recovery rate is calculated from the formula: tensile recovery rate (%) = L ₀ / L ₁ × 100; . In this method, L ₀ is the initial mark line spacing of 20 mm. The tensile tester and others are basically the same as in the case of the elongation at break described above. Although the tensile direction in the above test is not particularly limited, it is preferable that the tensile direction coincides with the longitudinal direction of the pressure-sensitive adhesive sheet or the long part thereof. The tensile recovery rate can be adjusted, for example, by selecting a base material.

<Adhesive layer>
(Base polymer)
The pressure-sensitive adhesive layer disclosed herein (in the case of a double-sided pressure-sensitive adhesive sheet with a substrate, includes the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer; the same applies hereinafter) is a known acrylic polymer in the field of pressure-sensitive adhesives. Containing, as a base polymer, one or more of various rubber-like polymers such as rubber-based polymers, polyester-based polymers, urethane-based polymers, polyether-based polymers, silicone-based polymers, polyamide-based polymers, and fluorine-based polymers. obtain. As will be described in detail later, the pressure-sensitive adhesive layer disclosed herein is preferably an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer, a rubber-based pressure-sensitive adhesive layer containing a rubber-based polymer as a base polymer, or a urethane-based polymer. Is a urethane-based pressure-sensitive adhesive layer containing as a base polymer. Alternatively, a pressure-sensitive adhesive layer using an acrylic polymer and a rubber polymer in combination as a base polymer may be used.

(Acrylic polymer)
In a preferred embodiment, the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer from the viewpoints of pressure-sensitive properties (typically, adhesive strength), molecular design, and stability over time. In this specification, the “base polymer” of the pressure-sensitive adhesive refers to a main component of a polymer component contained in the pressure-sensitive adhesive (typically, a component contained in an amount exceeding 50% by weight).

  As the acrylic polymer, for example, a polymer of a monomer raw material that contains an alkyl (meth) acrylate as a main monomer and may further contain a sub-monomer having copolymerizability with the main monomer is preferable. Here, the main monomer refers to a component that accounts for more than 50% by weight of all monomer components in the monomer raw material.

As the alkyl (meth) acrylate, for example, a compound represented by the following formula (1) can be suitably used.
CH ₂ ＣC (R ¹ ) COOR ² (1)
Here, R ¹ in the above formula (1) is a hydrogen atom or a methyl group. R ² is a linear alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of the number of carbon atoms may be referred to as “C _1-20 ”). From the viewpoint of the storage elastic modulus of the pressure-sensitive adhesive and the like, an alkyl (meth) acrylate in which R ² is a C _1-14 (for example, C _2-10 , typically C _4-8 ) chain alkyl group is preferable. ^An alkyl acrylate wherein ¹ is a hydrogen atom and R ² is a C _4-8 chain alkyl group is more preferred.

Examples of the alkyl (meth) acrylate in which R ² is a C _1-20 chain alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and n-butyl. (Meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate Octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) Acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, Eicosyl (meth) acrylate and the like. These alkyl (meth) acrylates can be used alone or in combination of two or more. Preferred alkyl (meth) acrylates include n-butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA). BA is more preferred from the viewpoints of adhesive properties and prevention of adhesive residue.

The proportion of the main monomer in all the monomer components is preferably 70% by weight or more (for example, 85% by weight or more, typically 90% by weight or more). The upper limit of the mixing ratio of the main monomer is not particularly limited, but is preferably 99.5% by weight or less (for example, 99% by weight or less). When C _4-8 alkyl acrylate is used as the monomer component, the proportion of C _4-8 alkyl acrylate in the alkyl (meth) acrylate contained in the monomer component is preferably 70% by weight or more, The content is more preferably 90% by weight or more, even more preferably 95% by weight or more (typically 99 to 100% by weight). The technology disclosed herein can be preferably implemented in an embodiment in which 50% by weight or more (for example, 60% by weight or more) of all monomer components is BA. In a preferred embodiment, the total monomer component may further comprise 2EHA in a lower proportion than BA.

  The auxiliary monomer having a copolymerizability with the main monomer, alkyl (meth) acrylate, can be useful for introducing a crosslinking point into the acrylic polymer or increasing the cohesive strength of the acrylic polymer. As the auxiliary monomer, for example, a carboxy group-containing monomer, a hydroxyl group-containing monomer, an acid anhydride group-containing monomer, an amide group-containing monomer, an amino group-containing monomer, a keto group-containing monomer, a monomer having a nitrogen atom-containing ring, an alkoxysilyl group-containing monomer, One or more kinds of functional group-containing monomers such as an imide group-containing monomer and an epoxy group-containing monomer can be used. For example, from the viewpoint of improving cohesive strength, an acrylic polymer obtained by copolymerizing a carboxy group-containing monomer and / or a hydroxyl group-containing monomer as the above-mentioned auxiliary monomer is preferable. Preferable examples of the carboxy group-containing monomer include acrylic acid (AA) and methacrylic acid (MAA). Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth). Examples include hydroxyalkyl (meth) acrylates such as acrylates and unsaturated alcohols. Among them, hydroxyalkyl (meth) acrylate is preferable, and 2-hydroxyethyl acrylate (HEA) and 4-hydroxybutyl acrylate (4HBA) are more preferable.

  The amount of the sub-monomer may be appropriately selected so as to achieve a desired cohesive force, and is not particularly limited. Normally, from the viewpoint of achieving a good balance between the adhesive force and the cohesive force, the amount of the auxiliary monomer is suitably 0.5% by weight or more, and preferably 1% by weight, of all the monomer components of the acrylic polymer. % Or more. Further, the amount of the auxiliary monomer is suitably 30% by weight or less, preferably 10% by weight or less (for example, 5% by weight or less) in all the monomer components. When the carboxy group-containing monomer is copolymerized with the acrylic polymer, the content of the carboxy group-containing monomer is determined from the viewpoint of compatibility between the adhesive force and the cohesive force in all the monomer components used for the synthesis of the acrylic polymer. It is preferably in the range of about 0.1 to 10% by weight (for example, 0.2 to 8% by weight, typically 0.5 to 5% by weight). When the hydroxyl group-containing monomer is copolymerized with the acrylic polymer, the content of the hydroxyl group-containing monomer is set to about 0 in all the monomer components used for the synthesis of the acrylic polymer from the viewpoint of compatibility between the adhesive force and the cohesive force. 0.001 to 10% by weight (e.g., 0.01 to 5% by weight, typically 0.02 to 2% by weight).

  The acrylic polymer disclosed herein may be copolymerized with a monomer other than the above (other monomers) as long as the effects of the present invention are not significantly impaired. The above-mentioned other monomers can be used for the purpose of, for example, adjusting the glass transition temperature of the acrylic polymer, adjusting the adhesive performance (for example, peelability), and the like. For example, monomers capable of improving the cohesive strength of the pressure-sensitive adhesive include sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, cyano group-containing monomers, vinyl esters, and aromatic vinyl compounds. One of the above-mentioned other monomers may be used alone, or two or more thereof may be used in combination. Among them, vinyl esters are preferred. Specific examples of vinyl esters include vinyl acetate (VAc), vinyl propionate, and vinyl laurate. Among them, VAc is preferable. The content of the other monomer is about 30% by weight or less (typically 0.01 to 30% by weight, for example, 0.1 to 10% by weight) in all the monomer components used for the synthesis of the acrylic polymer. Is preferred.

  The copolymer composition of the acrylic polymer is adjusted so that the glass transition temperature (Tg) of the polymer is −15 ° C. or less (typically −70 ° C. or more and −15 ° C. or less) from the viewpoint of impact resistance and the like. It is suitably designed, and the temperature is preferably −25 ° C. or less (eg, −60 ° C. or more and −25 ° C. or less), more preferably −40 ° C. or less (eg, −60 ° C. or more and −40 ° C. or less).

The Tg of the acrylic polymer can be adjusted by appropriately changing the monomer composition (that is, the type and amount ratio of the monomers used for synthesizing the polymer). Here, the Tg of the acrylic polymer refers to the Fox based on the Tg of the homopolymer (homopolymer) of each monomer constituting the polymer and the weight fraction (copolymerization ratio on a weight basis) of the monomer. Means the value obtained from the equation. The Fox equation is a relational expression between the Tg of the copolymer and the glass transition temperature Tgi of a homopolymer obtained by homopolymerizing each of the monomers constituting the copolymer, as shown below.
1 / Tg = Σ (Wi / Tgi)
In the above Fox equation, Tg is the glass transition temperature (unit: K) of the copolymer, Wi is the weight fraction of the monomer i in the copolymer (weight-based copolymerization ratio), and Tgi is the Represents the glass transition temperature (unit: K) of the homopolymer. As the Tg of the homopolymer, a value described in a known document is adopted.

In the technology disclosed herein, the following values are specifically used as the Tg of the homopolymer.
2-ethylhexyl acrylate -70 ° C
Butyl acrylate -55 ° C
Vinyl acetate 32 ° C
Acrylic acid 106 ° C
Methacrylic acid 228 ° C
2-hydroxyethyl acrylate -15 ° C
4-hydroxybutyl acrylate -40 ° C
For the Tg of the homopolymer other than those exemplified above, the values described in "Polymer Handbook" (3rd edition, John Wiley & Sons, Inc., 1989) are used. If not described in the above Polymer Handbook, the value obtained by the measurement method described in JP-A-2007-51271 shall be used.

  The method for obtaining the acrylic polymer is not particularly limited, and various polymerization methods known as synthetic methods for the acrylic polymer, such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a suspension polymerization method, are appropriately employed. be able to. For example, a solution polymerization method can be preferably used. As a monomer supply method for performing the solution polymerization, a batch supply method, a continuous supply (dropping) method, a divided supply (dropping) method, or the like, in which all the monomer raw materials are supplied at one time, can be appropriately adopted. The polymerization temperature can be appropriately selected depending on the type of the monomer and the solvent to be used, the type of the polymerization initiator, and the like. For example, the polymerization temperature is about 20 ° C to 170 ° C (typically 40 ° C to 140 ° C). it can. Alternatively, photopolymerization performed by irradiating light such as UV (typically performed in the presence of a photopolymerization initiator), radiation polymerization performed by irradiating radiation such as β-rays, γ-rays, or the like may be used. Active energy ray irradiation polymerization may be employed.

  The solvent (polymerization solvent) used for the solution polymerization can be appropriately selected from conventionally known organic solvents. For example, aromatic compounds (typically, aromatic hydrocarbons) such as toluene, acetates such as ethyl acetate, and aliphatic or alicyclic hydrocarbons are preferably used.

  The initiator used for the polymerization can be appropriately selected from conventionally known polymerization initiators according to the type of the polymerization method. For example, one or more azo-based polymerization initiators such as 2,2'-azobisisobutyronitrile (AIBN) can be preferably used. Other examples of the polymerization initiator include persulfates such as potassium persulfate; peroxide initiators such as benzoyl peroxide and hydrogen peroxide; substituted ethane initiators such as phenyl-substituted ethane; aromatic carbonyl compounds And the like. Still another example of the polymerization initiator includes a redox initiator obtained by combining a peroxide and a reducing agent. Such polymerization initiators can be used alone or in combination of two or more. The amount of the polymerization initiator used may be a usual amount, for example, about 0.005 to 1 part by weight (typically 0.01 to 1 part by weight) based on 100 parts by weight of all the monomer components. You can choose from a range.

The weight average molecular weight (Mw) of the base polymer (preferably an acrylic polymer) disclosed herein is not particularly limited, and may be, for example, in the range of 10 × 10 ⁴ or more and 500 × 10 ⁴ or less. From the viewpoint of balancing the cohesive force and the adhesive force at a high level, the Mw of the base polymer (preferably an acrylic polymer) is preferably 10 × 10 ^{4 to} 150 × 10 ⁴ , more preferably 20 × 10 ^{4 to} 110. × 10 ⁴ (for example, 20 × 10 ⁴ to 75 × 10 ⁴ ), and more preferably 35 × 10 ^{4 to} 90 × 10 ⁴ (for example, 35 × 10 ^{4 to} 65 × 10 ⁴ ). Here, Mw refers to a value in terms of standard polystyrene obtained by gel permeation chromatography (GPC). As the GPC device, for example, a model name “HLC-8320GPC” (column: TSKgelGMH-H (S), manufactured by Tosoh Corporation) may be used.

(Rubber-based polymer)
In another preferred embodiment, the pressure-sensitive adhesive layer is made of a rubber-based pressure-sensitive adhesive. The rubber pressure-sensitive adhesive according to a further preferred embodiment contains, as a base polymer, a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound. The monovinyl-substituted aromatic compound refers to a compound in which one functional group having a vinyl group is bonded to an aromatic ring. Representative examples of the aromatic ring include a benzene ring (which may be a benzene ring substituted with a functional group having no vinyl group (eg, an alkyl group)). Specific examples of the above-mentioned monovinyl-substituted aromatic compound include styrene, α-methylstyrene, vinyltoluene, vinylxylene and the like. Specific examples of the conjugated diene compound include 1,3-butadiene and isoprene. Such a block copolymer can be used alone or in combination of two or more as a base polymer.

  The A segment (hard segment) in the block copolymer has a copolymerization ratio of the monovinyl-substituted aromatic compound (two or more types can be used in combination) of 70% by weight or more (more preferably 90% by weight or more). May be substantially 100% by weight). The B segment (soft segment) in the block copolymer has a copolymerization ratio of the conjugated diene compound (two or more types can be used in combination) of 70% by weight or more (more preferably 90% by weight or more, and May be 100% by weight.) According to such a block copolymer, a higher-performance pressure-sensitive adhesive sheet can be realized.

  The block copolymer may be in the form of a diblock, a triblock, a radial, a mixture thereof, and the like. In the triblock body and the radial body, it is preferable that an A segment (for example, a styrene block) is arranged at the terminal of the polymer chain. This is because the A segment disposed at the end of the polymer chain easily aggregates to form a domain, thereby forming a pseudo crosslinked structure and improving the cohesiveness of the pressure-sensitive adhesive. The block copolymer in the technology disclosed herein has, for example, a diblock ratio of 30% by weight or more (more preferably 40% by weight) from the viewpoint of adhesion (peel strength) to an adherend and resistance to repulsion. Above, more preferably 50% by weight or more, particularly preferably 60% by weight or more, typically 65% by weight or more, for example, 70% by weight or more can be preferably used. Further, from the viewpoint of the resistance to the continuously applied stress, those having a diblock ratio of 90% by weight or less (more preferably 85% by weight or less, for example, 80% by weight or less) can be preferably used. For example, it is preferable to use a block copolymer having a diblock ratio of 60 to 85% by weight.

(Styrene block copolymer)
In a preferred embodiment of the technology disclosed herein, the base polymer is a styrenic block copolymer. For example, it can be preferably carried out in a mode in which the base polymer contains at least one of a styrene isoprene block copolymer and a styrene butadiene block copolymer. In the styrene-based block copolymer contained in the adhesive, the proportion of the styrene isoprene block copolymer is 70% by weight or more, the proportion of the styrene-butadiene block copolymer is 70% by weight or more, or styrene. It is preferable that the total ratio of the isoprene block copolymer and the styrene butadiene block copolymer is 70% by weight or more. In a preferred embodiment, substantially all (for example, 95 to 100% by weight) of the styrene-based block copolymer is a styrene-isoprene block copolymer. In another preferred embodiment, substantially all (for example, 95 to 100% by weight) of the styrene-based block copolymer is a styrene-butadiene block copolymer. According to such a composition, a pressure-sensitive adhesive sheet excellent in repulsion resistance and well-balanced with other pressure-sensitive adhesive properties can be suitably realized.

  The styrenic block copolymer may be in the form of a diblock, a triblock, a radial, a mixture thereof, or the like. In the triblock and radial bodies, a styrene block is preferably disposed at the end of the polymer chain. This is because the styrene blocks disposed at the ends of the polymer chain easily aggregate to form a styrene domain, thereby forming a pseudo-crosslinked structure and improving the cohesiveness of the pressure-sensitive adhesive. The styrene-based block copolymer used in the technology disclosed herein has, for example, a diblock ratio of 30% by weight or more (more preferably) from the viewpoint of adhesion (peeling strength) to an adherend and repulsion resistance. 40% by weight or more, more preferably 50% by weight or more, particularly preferably 60% by weight or more, typically 65% by weight or more. A styrene-based block copolymer having a diblock ratio of 70% by weight or more (for example, 75% by weight or more) may be used. Further, from the viewpoint of holding power and the like, a styrene-based block copolymer having a diblock ratio of 90% by weight or less (more preferably, 85% by weight or less, for example, 80% by weight or less) can be preferably used. For example, a styrene block copolymer having a diblock ratio of 60 to 85% by weight can be preferably used.

  The styrene content of the styrenic block copolymer may be, for example, 5 to 40% by weight. From the viewpoint of repulsion resistance and holding power, a styrene-based block copolymer having a styrene content of 10% by weight or more (more preferably, more than 10% by weight, for example, 12% by weight or more) is usually preferable. Further, from the viewpoint of the adhesive strength to the adherend, a styrene-based block copolymer having a styrene content of 35% by weight or less (typically 30% by weight or less, more preferably 25% by weight or less, for example, less than 20% by weight) is used. Coalescence is preferred. For example, a styrene-based block copolymer having a styrene content of 12% by weight or more and less than 20% by weight can be preferably used.

(Urethane polymer)
In still another preferred embodiment, the pressure-sensitive adhesive layer is formed of a urethane-based pressure-sensitive adhesive. Here, the urethane-based pressure-sensitive adhesive (layer) refers to a pressure-sensitive adhesive (layer) containing a urethane-based polymer as a base polymer. The urethane-based pressure-sensitive adhesive is typically made of a urethane-based resin containing, as a base polymer, a urethane-based polymer obtained by reacting a polyol with a polyisocyanate compound. The urethane-based polymer is not particularly limited, and a suitable urethane-based polymer (ether-based polyurethane, ester-based polyurethane, carbonate-based polyurethane, or the like) that can function as an adhesive can be used. Examples of the polyol include polyether polyol, polyester polyol, polycarbonate polyol, and polycaprolactone polyol. Examples of the polyisocyanate compound include diphenylmethane diisocyanate, tolylene diisocyanate, and hexamethylene diisocyanate.

(Filler particles)
The pressure-sensitive adhesive layer disclosed herein preferably contains filler particles. Thereby, it is possible to preferably achieve both the maintenance of the initial adhesive force A and the reduction of the tensile peeling stress B. This will be described. The filler particles contained in the pressure-sensitive adhesive layer may be in a state of being exposed on the pressure-sensitive adhesive surface or in a state of being included in the pressure-sensitive adhesive layer. The filler particles exposed on the pressure-sensitive adhesive surface reduce the pressure-sensitive adhesive area on the pressure-sensitive adhesive surface and improve the slip property of the bonding interface in the shear direction. As a result, the tensile peeling stress B is reduced, but the decrease in the pressure-sensitive adhesive area on the pressure-sensitive adhesive surface also results in a decrease in the initial adhesive force A. On the other hand, the filler particles existing inside the pressure-sensitive adhesive layer are considered to greatly contribute to the reduction of the tensile peeling stress B without lowering the initial adhesive force A. Although the main reason is not to be construed as being particularly limited, a change in the state of the pressure-sensitive adhesive layer due to deformation of the pressure-sensitive adhesive sheet may be considered. Specifically, since the tension peeling is a mode in which the pressure-sensitive adhesive is peeled off in a direction parallel to the adhesive surface (a tensile peeling direction; also referred to as a shearing direction), the pressure-sensitive adhesive sheet is deformed in this direction during the tensile peeling. . The extensible pressure-sensitive adhesive sheet expands in response to the above-mentioned tension, and the pressure-sensitive adhesive layer is deformed accordingly. For example, when the film-like substrate supporting the pressure-sensitive adhesive layer has extensibility with respect to tension, the pressure-sensitive adhesive layer is greatly deformed as the substrate elongates. It is considered that the deformation of the pressure-sensitive adhesive layer increases the amount of filler particles contained in the pressure-sensitive adhesive layer exposed to the pressure-sensitive adhesive surface, and improves the slip property in the shear direction at the bonding interface. It is also considered that the pressure-sensitive adhesive (adhesive component) in the pressure-sensitive adhesive layer is deformed by tensile peeling, whereas the filler particles behave differently from the pressure-sensitive adhesive in the pressure-sensitive adhesive layer. It is also conceivable that the difference in the behavior of the pressure-sensitive adhesive and the filler particles with respect to the tensile peeling contributes to the reduction of the tensile peeling stress. The change in the surface state of the pressure-sensitive adhesive layer and the behavior of the constituent components of the pressure-sensitive adhesive layer are considered to be negligible or not negligible in, for example, 90-degree peeling or 180-degree peeling due to the difference in the peeling mode. Can be However, it is considered that it typically has a large effect on the stress change during tensile peeling. As a result, the filler particles contained in the pressure-sensitive adhesive layer are considered to greatly contribute to both maintaining the initial adhesive force A and reducing the tensile peeling stress B. The effect of containing filler particles is particularly noticeable in an extensible pressure-sensitive adhesive sheet. Further, in an extensible pressure-sensitive adhesive sheet having a substrate, typically, the mechanical properties of the substrate can greatly contribute to the adhesive strength (typically, 180-degree peel strength). It is considered that the contribution of the additive component such as an agent or a crosslinking agent) to the adhesive strength is relatively small. In such a pressure-sensitive adhesive sheet, by including filler particles in the pressure-sensitive adhesive layer, an action of selectively reducing only the tensile peeling stress B while maintaining the initial pressure-sensitive adhesive strength A is preferably realized.

  The type of filler particles used is not particularly limited. For example, a particulate or fibrous filler can be used. The constituent material of the filler particles (typically a particulate filler) is, for example, a metal such as copper, silver, gold, platinum, nickel, aluminum, chromium, iron, stainless steel; aluminum oxide, silicon oxide (silicon dioxide), and oxide. Metal oxides such as titanium, zirconium oxide, zinc oxide, tin oxide, copper oxide and nickel oxide; aluminum hydroxide, boehmite, magnesium hydroxide, calcium hydroxide, zinc hydroxide, silicic acid, iron hydroxide, copper hydroxide, Metal hydroxides and hydrated metal compounds such as barium hydroxide, zirconium oxide hydrate, tin oxide hydrate, basic magnesium carbonate, hydrotalcite, dawsonite, borax, zinc borate; silicon carbide, boron carbide, Carbides such as nitrogen carbide and calcium carbide; nitrides such as aluminum nitride, silicon nitride, boron nitride and gallium nitride Carbonates such as calcium carbonate; titanates such as barium titanate and potassium titanate; carbon-based substances such as carbon black, carbon tubes (carbon nanotubes), carbon fibers and diamonds; inorganic materials such as glass; Acrylic resin (eg, polymethyl methacrylate), phenol resin, benzoguanamine resin, urea resin, silicone resin, polyester, polyurethane, polyethylene, polypropylene, polyamide (eg, nylon), polyimide, and polymers such as polyvinylidene chloride; Alternatively, natural raw material particles such as volcanic shirasu, clay, and sand may be used. Various synthetic fiber materials and natural fiber materials can be used as the fibrous filler. These can be used alone or in combination of two or more. Among them, a particulate filler is preferable from the viewpoint of reducing the tensile peeling stress, and among them, the use of a particulate filler composed of an inorganic material (for example, aluminum hydroxide) is preferable.

  When the pressure-sensitive adhesive layer contains filler particles, 50% by weight or more of the filler particles contained in the pressure-sensitive adhesive layer preferably have a particle diameter smaller than the thickness of the pressure-sensitive adhesive layer. As a result, the adhesive surface is more likely to maintain a favorable surface state, and can exhibit desired adhesive properties (for example, initial adhesive strength A). In addition, the tendency that the appearance of the surface of the pressure-sensitive adhesive layer is favorably maintained increases. In a preferred embodiment, 60% by weight or more (for example, 70% by weight or more, typically 80% by weight or more) of the filler particles contained in the pressure-sensitive adhesive layer has a particle diameter smaller than the thickness of the pressure-sensitive adhesive layer. . It is more preferable that substantially all of the filler particles contained in the pressure-sensitive adhesive layer (typically 99 to 100% by weight) have a particle diameter smaller than the thickness of the pressure-sensitive adhesive layer. In another preferred embodiment, from the viewpoint of improving the surface condition of the pressure-sensitive adhesive surface, 40% by weight or more (for example, 50% by weight or more, typically 55% by weight or more) of the filler particles contained in the pressure-sensitive adhesive layer. Has a particle diameter smaller than 2/3 (i.e., 2 / 3T, more preferably 1/2, i.e., 1 / 2T) of the thickness T of the pressure-sensitive adhesive layer. It should be noted that X weight% or more of the filler particles has a particle size smaller than Y means that the cumulative particle size (weight basis) up to the particle size Y (μm) in the particle size distribution obtained by the measurement based on the sieving method is X ( % By weight). The ratio (% by weight) of the filler particles having a predetermined particle size can be determined based on the particle size distribution.

  In one preferred embodiment, particles having a particle diameter of less than 30 μm account for 50% by weight or more (for example, 70% by weight or more, typically 90% by weight or more) of the filler particles contained in the pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer containing such filler particles does not easily impair the smoothness of the pressure-sensitive adhesive surface even if the content of the filler particles is relatively large, and is advantageous in terms of maintaining the adhesive force and appearance. As for the filler particles contained in the pressure-sensitive adhesive layer, particles having a particle size of less than 20 μm (eg, less than 15 μm, typically less than 10 μm) are 50% by weight or more (eg, 70% by weight or more, typically 80% by weight or more). More preferably.

  In a preferred embodiment, the proportion of particles having a particle diameter of less than 1 μm among the filler particles contained in the pressure-sensitive adhesive layer is 50% by weight or less. From the viewpoint of reducing the tensile peeling stress, it is desirable that the particle size of the filler particles has a certain size. It is preferable in terms of productivity that the amount of the fine particles is limited, for example, an excessive increase in viscosity does not occur in the preparation of the pressure-sensitive adhesive composition. The proportion of particles having a particle diameter of less than 1 μm (eg, less than 2 μm, typically less than 5 μm) in the filler particles contained in the pressure-sensitive adhesive layer is 30% by weight or less (eg, 10% by weight or less, typically 5% by weight or less).

  The average particle diameter of the entire filler particles contained in the pressure-sensitive adhesive layer is usually 0.5 μm or more, preferably 0.8 μm or more (for example, 3 μm or more, typically 5 μm or more). When the average particle size increases, the effect of reducing the tensile peeling stress tends to be improved, and the tensile peeling stress B can be efficiently reduced by adding a small amount of filler particles. It is also preferable that the average particle size is not less than a predetermined value, from the viewpoint of maintaining the viscosity and the dispersibility of the composition well. The upper limit of the average particle size is usually appropriate to be 50 μm or less, preferably 30 μm or less, more preferably 25 μm or less, and further preferably 15 μm or less. When the average particle size is small, a decrease in adhesive performance tends to be suppressed. It is desirable that the average particle size is also small in terms of the appearance of the adhesive surface. In this specification, the average particle size of the filler particles refers to a particle size (50% median diameter) at which the weight-based cumulative particle size becomes 50% in a particle size distribution obtained by measurement based on a sieving method. .

  The shape of the filler particles is not particularly limited, and may be, for example, a bulk shape, a needle shape, a plate shape (for example, a hexagonal plate shape), a layer shape, or the like. The concept of a bulk shape includes, for example, a spherical shape, a rectangular parallelepiped shape, a crushed shape, or an irregular shape thereof. The shape of the filler particles is preferably a bulk shape, and among them, a spherical shape is more preferable.

  The average aspect ratio of the filler particles is not particularly limited, and is preferably less than about 100, preferably less than 50, more preferably less than 10 (e.g., less than 5, typically less than 2) from the viewpoint of reducing tensile peel stress. Can be Here, the average aspect ratio of the filler particles is determined as the average value of the aspect ratio of each particle represented by the major axis / minor axis of the filler particles. The major axis typically refers to the maximum passing length of the particles to be measured, and the minor axis typically refers to the minimum passing length of the particles to be measured. The average aspect ratio can be determined through observation with a transmission electron microscope.

When the pressure-sensitive adhesive layer contains filler particles, the content C of the filler particles in the pressure-sensitive adhesive layer is suitably set to 30% by volume or less. By appropriately adjusting the particle diameter and the content of the filler particles, it is possible to preferably reduce the tensile peeling stress B while suppressing a decrease in the initial adhesive force A. The content C of the filler particles in the pressure-sensitive adhesive layer is preferably 25% by volume or less, more preferably 20% by volume or less (for example, 16% by volume or less, typically 14% by volume or less). From the viewpoint of reducing the tensile peeling stress, the content C is suitably at least 0.3% by volume, preferably at least 2% by volume, more preferably at least 3% by volume (for example, 5% by volume). %, Typically 10% by volume or more). Since the technology disclosed herein can exhibit a desired effect by adding a small amount of filler particles, the pressure-sensitive adhesive layer (pressure-sensitive adhesive composition) substantially contains a component (dispersant) that improves the dispersibility of the filler particles. May not be included, or may contain the above-mentioned dispersant. The content C [% by volume] of the filler particles is determined based on the weight ratio and density of components other than the filler particles (typically, the adhesive component) in the pressure-sensitive adhesive layer, and the weight ratio and density of the filler particles. For example, by adopting 2.42 g / cm ³ as the density of aluminum hydroxide, the content C [% by volume] of the filler particles in the pressure-sensitive adhesive layer can be determined.

  When the pressure-sensitive adhesive layer contains filler particles, the content of the filler particles (for example, inorganic material particles, typically a metal oxide or a metal hydroxide) in the pressure-sensitive adhesive layer is 100% by weight on a weight basis. It is suitably less than 100 parts by weight based on parts. By appropriately adjusting the particle diameter and the content of the filler particles, it is possible to preferably reduce the tensile peeling stress B while suppressing a decrease in the initial adhesive force A. The content of the filler particles in the pressure-sensitive adhesive layer is preferably 80 parts by weight or less, more preferably 60 parts by weight or less (for example, 45 parts by weight or less, typically 35 parts by weight or less, based on 100 parts by weight of the base polymer. ). In addition, from the viewpoint of reducing the tensile peeling stress, the content is suitably 0.5 parts by weight or more, preferably 3 parts by weight or more, more preferably 5 parts by weight or more, and further more preferably 8 parts by weight. (Eg, 12 parts by weight or more, typically 25 parts by weight or more).

(Acrylic oligomer)
The pressure-sensitive adhesive composition disclosed herein may include an acrylic oligomer. By employing an acrylic oligomer, impact resistance and repulsion resistance can be improved in a well-balanced manner. In the case of curing the pressure-sensitive adhesive composition by actinic energy ray irradiation (for example, UV irradiation), the acrylic oligomer inhibits curing (for example, not cured) as compared with, for example, a rosin-based or terpene-based tackifying resin. (Polymerization inhibition of the reaction monomer). The acrylic oligomer is a polymer containing an acrylic monomer as a constituent monomer component, and is defined as a polymer having a smaller Mw than that of the acrylic polymer.

  The proportion of the acrylic monomer in all the monomer components constituting the acrylic oligomer is typically more than 50% by weight, preferably 60% by weight or more, more preferably 70% by weight or more (for example, 80% by weight). Or more, and 90% by weight or more). In a preferred embodiment, the acrylic oligomer has a monomer composition consisting essentially of only acrylic monomers.

  As the constituent monomer components of the acrylic oligomer, the linear alkyl (meth) acrylates, functional group-containing monomers, and other monomers exemplified as the monomers that can be used for the acrylic polymer can be used. Further, the constituent monomer may include an alicyclic hydrocarbon group-containing (meth) acrylate. As the monomer component constituting the acrylic oligomer, one or more of the various monomers exemplified above can be used.

As the chain alkyl (meth) acrylate, an alkyl (meth) acrylate in which R ² is C _1-12 (for example, C _1-8 ) in the above formula (1) is preferably used. Preferred examples thereof include methyl methacrylate (MMA), ethyl acrylate, n-butyl acrylate (BA), isobutyl methacrylate, t-butyl acrylate, and 2-ethylhexyl acrylate (2EHA). Among them, MMA is more preferable.

  Preferred examples of the functional group-containing monomer include monomers having a nitrogen atom-containing ring (typically a nitrogen atom-containing heterocycle) such as N-vinyl-2-pyrrolidone and N-acryloylmorpholine; N, N-dimethylamino Amino-containing monomers such as ethyl (meth) acrylate; amide-containing monomers such as N, N-diethyl (meth) acrylamide; carboxy-containing monomers such as AA and MAA; and hydroxyl-containing monomers such as HEA.

  As the alicyclic hydrocarbon group-containing (meth) acrylate, for example, one kind of alicyclic hydrocarbon group-containing (meth) acrylate in which the number of carbon atoms of the alicyclic hydrocarbon group is in the range of 4 to 20 Alternatively, two or more kinds can be used. The number of carbon atoms is preferably 5 or more (for example, 6 or more, typically 8 or more), and preferably 16 or less (for example, 12 or less, typically 10 or less). Preferable examples of the alicyclic hydrocarbon group-containing (meth) acrylate include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopentanyl (meth) acrylate. Among them, dicyclopentanyl methacrylate (DCPMA) is more preferable.

  The ratio of the alicyclic hydrocarbon group-containing (meth) acrylate in all the monomer components constituting the acrylic oligomer (i.e., the copolymerization ratio) is approximately 30 to 90% by weight (from the viewpoint of tackiness and cohesiveness). For example, it is preferably 50 to 80% by weight, typically 55 to 70% by weight.

  In a preferred embodiment, the acrylic oligomer contains a chain alkyl (meth) acrylate and / or an alicyclic hydrocarbon group-containing (meth) acrylate as a constituent monomer component. In this embodiment, the proportion of the chain alkyl group-containing and alicyclic hydrocarbon group-containing (meth) acrylic ester in all monomer components constituting the acrylic oligomer is about 80% by weight or more (for example, 90 to 100%). % By weight, typically 95 to 100% by weight). More preferably, the monomer component constituting the acrylic oligomer is substantially composed of a chain alkyl (meth) acrylate and / or an alicyclic hydrocarbon group-containing (meth) acrylate.

When the acrylic oligomer is a copolymer of a monomer mixture containing a chain alkyl (meth) acrylate and an alicyclic hydrocarbon group-containing (meth) acrylate, the chain alkyl (meth) acrylate and the alicyclic hydrocarbon The ratio with the group-containing (meth) acrylate is not particularly limited. In a preferred embodiment, the weight ratio of the weight ratio of the chain alkyl (meth) acrylate (W _A ) to the weight ratio of the alicyclic hydrocarbon group-containing (meth) acrylate (W _B ) in the constituent monomer components of the acrylic oligomer is described. (W _A : W _B ) is 1: 9 to 9: 1, preferably 2: 8 to 7: 3 (for example, 3: 7 to 6: 4, typically 3: 7 to 5: 5). It is.

  Although not particularly limited, the composition (that is, the polymerization composition) of the constituent monomer components of the acrylic oligomer can be set so that the Tg of the acrylic oligomer is from 10 ° C to 300 ° C. Here, the Tg of the acrylic oligomer refers to a value obtained in the same manner as the Tg based on the constituent monomer composition of the acrylic polymer based on the composition of the constituent monomer components of the acrylic oligomer. The Tg of the acrylic oligomer is preferably 180 ° C. or lower (for example, 160 ° C. or lower) from the viewpoint of initial adhesiveness. Further, the Tg is preferably 60 ° C. or higher (for example, 100 ° C. or higher, typically 120 ° C. or higher) from the viewpoint of the cohesiveness of the pressure-sensitive adhesive.

The Mw of the acrylic oligomer is not particularly limited, but is typically about 0.1 × 10 ^{4 to} 3 × 10 ⁴ . From the viewpoint of improving the adhesive properties (for example, adhesive strength and repulsion resistance), the Mw of the acrylic oligomer is preferably 1.5 × 10 ⁴ or less, more preferably 1 × 10 ⁴ or less, and 0.8 × 10 ⁴ or less. (For example, 0.6 × 10 ⁴ or less) is more preferable. Further, from the viewpoint of the cohesiveness of the pressure-sensitive adhesive, the Mw is preferably 0.2 × 10 ⁴ or more (for example, 0.3 × 10 ⁴ or more). The molecular weight of the acrylic oligomer can be adjusted by using a chain transfer agent as needed in the polymerization.

  The acrylic oligomer can be formed by polymerizing the constituent monomer components. The polymerization method and the polymerization mode are not particularly limited, and conventionally known various polymerization methods (for example, solution polymerization, emulsion polymerization, bulk polymerization, photopolymerization, radiation polymerization, and the like) can be adopted in appropriate modes. The types and amounts of the polymerization initiators (for example, azo-based polymerization initiators such as AIBN) that can be used as necessary are also substantially as described above, and thus the description will not be repeated here.

  The content of the acrylic oligomer in the pressure-sensitive adhesive composition disclosed herein is suitably, for example, 0.5 parts by weight or more based on 100 parts by weight of the acrylic polymer. From the viewpoint of better exhibiting the effect of the acrylic oligomer, the content of the acrylic oligomer is preferably 1 part by weight or more (for example, 1.5 parts by weight or more, typically 2 parts by weight or more). . Further, from the viewpoints of the curability of the pressure-sensitive adhesive composition and the compatibility with the acrylic polymer, the content of the acrylic oligomer is suitably less than 50 parts by weight (for example, less than 10 parts by weight), It is preferably less than 8 parts by weight (for example, less than 7 parts by weight, typically 5 parts by weight or less). Even with the addition of such a small amount, improvement in impact resistance and rebound resistance by using an acrylic oligomer can be realized.

(Tackifier)
The pressure-sensitive adhesive layer disclosed herein may be a composition containing a tackifier. The tackifier is not particularly limited, for example, rosin-based tackifier resin, terpene-based tackifier resin, hydrocarbon-based tackifier resin, epoxy-based tackifier resin, polyamide-based tackifier resin, elastomer-based tackifier resin, Various tackifier resins such as a phenol-based tackifier resin and a ketone-based tackifier resin can be used. Such tackifying resins can be used alone or in combination of two or more.

  Specific examples of the rosin-based tackifying resin include unmodified rosins (raw rosins) such as gum rosin, wood rosin and tall oil rosin; modified rosins obtained by modifying these unmodified rosins by hydrogenation, disproportionation, polymerization, etc. Hydrogenated rosin, disproportionated rosin, polymerized rosin, other chemically modified rosins, etc. The same applies hereinafter.); Various other rosin derivatives; Examples of the rosin derivative include rosins such as unmodified rosin esterified with alcohols (ie, rosin esterified product) and modified rosin esterified with alcohols (ie, modified rosin esterified product). Esters: Unmodified rosin, modified rosin, and unsaturated fatty acid-modified rosins modified with unsaturated fatty acids; rosin esters, modified with unsaturated fatty acids, unsaturated fatty acid modified rosins; Unmodified rosin, modified rosin, unsaturated Rosin alcohols obtained by reducing the carboxy group in fatty acid-modified rosins or unsaturated fatty acid-modified rosin esters; metal salts of rosins (particularly, rosin esters) such as unmodified rosin, modified rosin, and various rosin derivatives; (Unmodified rosin, modified rosin, various rosin derivatives, etc.) Rosin phenol resins obtained by thermal polymerization by adding Lumpur acid catalyst; and the like. When an acrylic polymer is used as the base polymer, it is preferable to use a rosin-based tackifying resin. From the viewpoint of improving the adhesive properties such as adhesive strength, one of the above-mentioned rosin-based tackifying resins is selected alone, or two or three or more kinds having different kinds and properties (for example, softening points) are used in combination. Is more preferable.

  Examples of terpene-based tackifying resins include terpene resins such as α-pinene polymer, β-pinene polymer, and dipentene polymer; and modification of these terpene resins (phenol modification, aromatic modification, hydrogenation modification, hydrocarbon Modified terpene resin). Examples of the modified terpene resin include a terpene-modified phenol resin, a styrene-modified terpene resin, an aromatic-modified terpene resin, a hydrogenated terpene resin, and the like. When an acrylic polymer is used as the base polymer, it is preferable to use a terpene-based tackifying resin (for example, a terpene-modified phenol resin). In particular, from the viewpoint of improving the adhesive properties such as adhesive strength, one or two or more of the above-mentioned terpene-based tackifying resins (for example, terpene-modified phenol resins) having different types and properties (for example, softening points) are used in combination. Is preferred.

  Examples of the hydrocarbon-based tackifying resin include aliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aliphatic / aromatic petroleum resins (styrene-olefin copolymers, etc.). ), Various hydrocarbon resins such as aliphatic / alicyclic petroleum resins, hydrogenated hydrocarbon resins, cumarone resins, and cumarone indene resins.

  In the technique disclosed herein, a resin having a softening point (softening temperature) of about 70 ° C. or more (preferably about 100 ° C. or more, more preferably about 110 ° C. or more) can be preferably used as the tackifying resin. According to the pressure-sensitive adhesive containing a tackifying resin having a softening point equal to or higher than the lower limit described above, a pressure-sensitive adhesive sheet having more excellent adhesive strength can be realized. Of the tackifying resins exemplified above, terpene-based tackifying resins (for example, terpene-modified phenolic resins) and rosin-based tackifying resins (for example, esterified products of polymerized rosin) having the above softening point can be preferably used. The upper limit of the softening point of the tackifier resin is not particularly limited, and may be, for example, about 200 ° C. or less (typically about 180 ° C. or less). Here, the softening point of the tackifier resin is defined as a value measured by a softening point test method (ring and ball method) specified in either JIS K 5902 or JIS K 2207.

  The amount of the tackifier used is not particularly limited, and can be appropriately set according to the desired tackiness performance (adhesive strength and the like). For example, the tackifier is used in an amount of about 10 to 100 parts by weight (more preferably 20 to 80 parts by weight, and still more preferably 30 to 60 parts by weight) based on 100 parts by weight of the acrylic polymer on a solid content basis. Is preferred. The technology disclosed herein may be implemented in a mode including a pressure-sensitive adhesive layer substantially free of a tackifier.

  When the pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive, the rubber-based pressure-sensitive adhesive preferably contains a high softening point resin having a softening point of 120 ° C. or higher as a tackifying resin. The pressure-sensitive adhesive sheet of such an embodiment is preferable from the viewpoint of repulsion resistance, holding power, and the like. In a preferred embodiment, the high softening point resin may include a tackifying resin having a softening point of 125 ° C. or higher (more preferably 130 ° C. or higher, further preferably 135 ° C. or higher, for example, 140 ° C. or higher). In addition, from the viewpoint of adhesive strength to an adherend and the like, the softening point of the high softening point resin is usually appropriately 200 ° C or lower, preferably 180 ° C or lower, more preferably 170 ° C or lower (for example, 160 ° C or lower). ).

  As the high softening point resin, terpene phenol resin, polymerized rosin, esterified product of polymerized rosin and the like can be preferably used. These high softening point resins can be used alone or in an appropriate combination of two or more. In a preferred embodiment, the high softening point resin includes one or more terpene phenol resins. For example, a terpene phenol resin having a softening point of 120 ° C to 200 ° C (typically 120 ° C to 180 ° C, for example, 125 ° C to 170 ° C) can be preferably used.

  The terpene phenol resin preferably has a softening point of 120 ° C. or more and a hydroxyl value (OH value) of 40 mg KOH / g or more (typically 40 to 200 mg KOH / g, for example, 40 to 160 mg KOH / g). Can be adopted. According to the terpene phenol resin having such a hydroxyl value, a higher-performance pressure-sensitive adhesive sheet can be realized. As the value of the hydroxyl value in this specification, a value measured by a potentiometric titration method specified in JIS K 0070: 1992 can be adopted. As a specific measurement method, a method described in JP-A-2014-55235 is employed.

  The technology disclosed herein is, for example, that the rubber-based pressure-sensitive adhesive has a high softening point resin (H1) having a hydroxyl value of 40 mgKOH / g or more and less than 80 mgKOH / g, and a hydroxyl value of 80 mgKOH / g or more (typically 80 to 80 mgKOH / g). 160 mgKOH / g, for example, 80 to 140 mgKOH / g) of the high softening point resin (H2). In this case, the relationship between the amounts of the high softening point resin (H1) and the high softening point resin (H2) used is such that the weight ratio (H1: H2) is in the range of 1: 5 to 5: 1. It is usually appropriate to set the ratio to be in the range of 1: 3 to 3: 1 (for example, 1: 2 to 2: 1). As a preferred embodiment, there is an embodiment in which both the high softening point resin (H1) and the high softening point resin (H2) are terpene phenol resins.

  From the viewpoints of repulsion resistance and holding power, the content of the high softening point resin can be, for example, 20 parts by weight or more, and 30 parts by weight or more (for example, 35 parts by weight or more) based on 100 parts by weight of the base polymer. ) Is preferable. From the viewpoints of adhesive strength and low-temperature properties, the content of the high softening point resin to 100 parts by weight of the base polymer is usually 100 parts by weight or less, preferably 80 parts by weight or less, more preferably 80 parts by weight or less. Is 70 parts by weight or less. The content of the high softening point resin may be 60 parts by weight or less (for example, 50 parts by weight or less).

  The technology disclosed herein is an embodiment in which the rubber-based pressure-sensitive adhesive contains a low softening point resin having a softening point of less than 120 ° C. in place of the high softening point resin or in addition to the high softening point resin. Can be implemented. As a preferred embodiment, there is an embodiment in which the rubber-based pressure-sensitive adhesive contains a high softening point resin having a softening point of 120 ° C or more and a low softening point resin having a softening point of less than 120 ° C.

  As the low softening point resin, those having a softening point of, for example, 40 ° C. or more (typically 60 ° C. or more) can be used. From the viewpoints of repulsion resistance, holding power, and the like, usually, those having a softening point of 80 ° C. or more (more preferably 100 ° C. or more) and less than 120 ° C. can be preferably used. You may use the low softening point resin whose softening point is 110 to 120 degreeC.

  The technology disclosed herein can be preferably implemented in a mode in which the rubber-based pressure-sensitive adhesive contains at least one of a petroleum resin and a terpene resin (typically, an unmodified terpene resin) as the low softening point resin. For example, the main component of the low softening point resin (that is, the component that accounts for more than 50% by weight of the low softening point resin) is a composition that is a petroleum resin, a composition that is a terpene resin, or a combination of a petroleum resin and a terpene resin. A certain composition or the like can be preferably employed. From the viewpoint of adhesive strength and compatibility, an embodiment in which the main component of the low softening point resin is a terpene resin (for example, a β-pinene polymer) is preferable. Substantially all (for example, 95% by weight or more) of the low softening point resin may be a terpene resin.

  In a preferred embodiment, the low softening point resin may be a tackifier resin having a hydroxyl value of 0 or more and less than 80 mgKOH / g (low hydroxyl value tackifier resin). As the low hydroxyl value tackifying resin, those having a hydroxyl value in the above range among the various tackifying resins described above can be used alone or in an appropriate combination. For example, a terpene phenol resin having a hydroxyl value of 0 to less than 80 mgKOH / g, a petroleum resin (for example, a C5 petroleum resin), a terpene resin (for example, a β-pinene polymer), a rosin-based resin (for example, polymerized rosin), rosin Derivative resins (for example, esterified products of polymerized rosin) and the like can be used.

  From the viewpoint of the adhesive force to the adherend, the content of the low softening point resin can be, for example, 10 parts by weight or more, and usually 15 parts by weight or more (for example, 20 parts by weight) based on 100 parts by weight of the base polymer. Above) is appropriate. In addition, from the viewpoint of rebound resistance and the like, it is usually appropriate to set the content of the low softening point resin to 120 parts by weight or less, preferably 90 parts by weight or less, more preferably 70 parts by weight or less (for example, 60 parts by weight or less). Parts by weight or less). The content of the low softening point resin may be 50 parts by weight or less (for example, 40 parts by weight or less).

  When the tackifying resin contains a low softening point resin and a high softening point resin, the weight ratio of the low softening point resin to the high softening point resin is 1: 5 to 3: 1 (more preferably). Is preferably set to be 1: 5 to 2: 1). The technology disclosed herein relates to a mode in which the rubber-based pressure-sensitive adhesive contains a higher softening point resin as a tackifying resin than a low softening point resin (for example, when the weight ratio of the low softening point resin to the high softening point resin is 1). : 1.2 to 1: 5). According to this aspect, a higher-performance pressure-sensitive adhesive sheet can be realized.

  In the technology disclosed herein, the content of the tackifying resin to 100 parts by weight of the base polymer (typically, a rubber-based polymer) is generally appropriate to be 20 parts by weight or more, preferably 30 parts by weight. As described above, it is more preferably at least 40 parts by weight (for example, at least 50 parts by weight). From the viewpoint of low-temperature properties (eg, adhesive strength and impact resistance under low-temperature conditions), the content of the tackifier resin to 100 parts by weight of the base polymer is usually 200 parts by weight or less. , Preferably 150 parts by weight or less. The content of the tackifier resin to 100 parts by weight of the base polymer may be 100 parts by weight or less (for example, 80 parts by weight or less).

(Crosslinking agent)
The pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer disclosed herein may include a crosslinking agent as necessary. The type of the crosslinking agent is not particularly limited, and can be appropriately selected from conventionally known crosslinking agents. Examples of such a crosslinking agent include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, oxazoline-based crosslinking agents, aziridine-based crosslinking agents, melamine-based crosslinking agents, peroxide-based crosslinking agents, metal chelate-based crosslinking agents, and the like. Can be As the crosslinking agent, one kind can be used alone, or two or more kinds can be used in combination. Above all, from the viewpoint of improving cohesive strength, use of an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent is preferred, and an isocyanate-based crosslinking agent is more preferred.

  The amount of the crosslinking agent to be used is not particularly limited. For example, about 10 parts by weight or less (for example, about 0.005 to 10 parts by weight, preferably about 0.01 to about 100 parts by weight based on 100 parts by weight of the base polymer (for example, acrylic polymer)) 5 parts by weight). Since the technology disclosed herein can achieve a desired tensile peel stress B without reducing the amount of the cross-linking agent used, the amount of the cross-linking agent used is approximately 0 with respect to 100 parts by weight of the acrylic polymer. 0.1 parts by weight or more (for example, 0.8 parts by weight or more, typically 1.2 parts by weight or more). In addition, from the viewpoint of limiting the cohesive force and reducing the tensile peel stress B, the amount of the crosslinking agent used is about 5 parts by weight or less (for example, 3 parts by weight or less, typically 3 parts by weight, based on 100 parts by weight of the acrylic polymer). May be 2 parts by weight or less).

(Other components)
The pressure-sensitive adhesive composition may contain a leveling agent, a crosslinking assistant, a plasticizer, a softener, a coloring agent (dye or pigment), an antistatic agent, an antioxidant, an ultraviolet absorber, an antioxidant, It may contain various additives commonly used in the field of pressure-sensitive adhesive compositions, such as stabilizers and dispersants. In addition, for example, an adhesive agent such as a silicone oligomer may be added to the adhesive composition (typically, an acrylic adhesive composition). As for such various additives, conventionally known ones can be used in a conventional manner, and do not particularly characterize the present invention, and thus detailed description thereof will be omitted.

(Adhesive composition)
The pressure-sensitive adhesive layer disclosed herein may be a pressure-sensitive adhesive layer formed from a water-based pressure-sensitive adhesive composition, a solvent-based pressure-sensitive adhesive composition, a hot-melt-type pressure-sensitive adhesive composition, or an active energy ray-curable pressure-sensitive adhesive composition. . The water-based pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in the form of a pressure-sensitive adhesive (pressure-sensitive adhesive layer-forming component) in a solvent containing water as a main component (water-based solvent), and is typically dispersed in water. And a so-called pressure-sensitive adhesive composition (a composition in which at least a part of the pressure-sensitive adhesive is dispersed in water). Further, the solvent-based pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in a form containing a pressure-sensitive adhesive in an organic solvent. The technology disclosed herein is preferably implemented in an aspect including an adhesive layer formed from a solvent-type adhesive composition from the viewpoint of suitably realizing adhesive properties such as adhesive strength.

(Method of forming pressure-sensitive adhesive layer)
The pressure-sensitive adhesive layer disclosed herein can be formed by a conventionally known method. For example, a method of forming a pressure-sensitive adhesive layer by applying a pressure-sensitive adhesive composition to a surface having peelability (peeling surface) and drying the pressure-sensitive adhesive composition can be employed. Alternatively, a method (direct method) of forming a pressure-sensitive adhesive layer by directly applying (typically, applying) the pressure-sensitive adhesive composition to a film-like substrate and drying the pressure-sensitive adhesive composition can be employed. Further, a method of transferring a pressure-sensitive adhesive composition to a film-like substrate by forming a pressure-sensitive adhesive layer on the surface by applying and drying the pressure-sensitive adhesive composition on a surface having a releasable property (release surface) (transfer) Method). As the release surface, the surface of a release liner, the back surface of a substrate subjected to a release treatment, or the like can be used. In addition, the pressure-sensitive adhesive layer disclosed herein is typically formed continuously, but is not limited to such a form.For example, a point-like, stripe-like or other regular or random pattern The formed pressure-sensitive adhesive layer may be used.

  The application of the pressure-sensitive adhesive composition can be performed using a conventionally known coater such as a gravure roll coater, a die coater, and a bar coater. Alternatively, the pressure-sensitive adhesive composition may be applied by impregnation, curtain coating, or the like. Further, the drying of the pressure-sensitive adhesive composition is preferably performed under heating from the viewpoint of accelerating a crosslinking reaction, improving production efficiency, and the like. The drying temperature can be, for example, about 40 to 150 ° C (preferably about 60 to 130 ° C). After drying the pressure-sensitive adhesive composition, further aging may be performed for the purpose of adjusting the migration of components in the pressure-sensitive adhesive layer, progressing the crosslinking reaction, or reducing strain that may be present in the substrate or the pressure-sensitive adhesive layer. Good.

(Thickness of adhesive layer)
The thickness of the pressure-sensitive adhesive layer disclosed herein is not particularly limited, and can be appropriately selected depending on the purpose. Usually, the thickness of the pressure-sensitive adhesive layer is suitably about 3 to 200 μm, preferably about 5 to 150 μm, more preferably about 8 to 100 μm from the viewpoint of productivity such as drying efficiency and pressure-sensitive adhesive performance. And more preferably 15 to 80 μm. In the case of a double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on both sides of a film-like substrate, the thickness of each pressure-sensitive adhesive layer may be the same or different.

<Film substrate>
It is preferable that the film-shaped substrate disclosed herein has a breaking strength of 10 MPa or more. By using a film-shaped substrate exhibiting the above-mentioned breaking strength, the pressure-sensitive adhesive sheet becomes more difficult to be broken, and can exhibit excellent tensile removability. According to the film-shaped substrate having the above-mentioned breaking strength, the processability tends to be improved. The breaking strength is more preferably 30 MPa or more (for example, 45 MPa or more, typically 60 MPa or more). In addition, from the viewpoint of the elasticity and extensibility of the film-like substrate, the breaking strength is preferably about 100 MPa or less (for example, 90 MPa or less, typically 80 MPa or less). The breaking strength is measured by the same method as in the case of the pressure-sensitive adhesive sheet. The breaking strength of the substrate can be adjusted, for example, by selecting the type of the substrate material (selection of the mixing ratio of the hard component and the soft component, etc.), the molding method, and the like.

  It is preferable that the film-shaped substrate disclosed herein has an elongation at break of 300% or more. The substrate exhibiting the elongation at break elongates in response to the tension at the time of removing the adhesive sheet. Due to this elongation, the adhesive sheet is deformed and peeled off from the adherend. As described above, the tension and the deformation of the base material interact with each other, so that the pressure-sensitive adhesive sheet is further improved in tension-removability (particularly, shear-removability). The elongation at break is more preferably 500% or more (for example, 700% or more, typically 800% or more). The upper limit of the elongation at break is not particularly limited, but may be, for example, about 1000% or less (typically 900% or less) from the viewpoint of removal workability and the like. The elongation at break is measured by the same method as in the case of the pressure-sensitive adhesive sheet.

  Suitably, the film-like substrate disclosed herein exhibits a tensile recovery of more than 50%, and the above-mentioned tensile recovery is preferably 70% or more. The tensile recovery is more preferably 80% or more (for example, 90% or more, typically 93% to 100%). Thereby, damage such as shredding at the time of removing the adhesive sheet can be more highly prevented. The measurement of the tensile recovery rate is performed by the same method as the method for measuring the tensile recovery rate of the pressure-sensitive adhesive sheet. The tensile recovery rate of the substrate can be adjusted, for example, by selecting the type of the substrate material (selection of the mixing ratio of the hard component and the soft component, etc.), the molding method, and the like.

  Preferably, the film-like substrate disclosed herein exhibits a 5% modulus of less than 10 MPa. When the 5% modulus of the film-like base material is set to be less than the predetermined value, when the pressure-sensitive adhesive sheet is removed from the adherend by elongating and deforming, the resistance at the start of pulling becomes small and the tensile-removing property tends to be excellent. is there. The 5% modulus is more preferably less than 5 MPa (eg, less than 3 MPa, typically less than 2 MPa). Although the lower limit of the 5% modulus is not particularly limited, it is usually appropriate to set it to 0.5 MPa or more (for example, 1 MPa or more) from the viewpoint of sticking workability of the pressure-sensitive adhesive sheet. The 5% modulus is measured according to the method for measuring “tensile stress” described in JIS K 7311: 1995. More specifically, a tensile test was performed using a No. 3 dumbbell-shaped test piece (width: 5 mm, mark interval: 20 mm) at a tensile speed of 300 mm / min. ] Is 5% modulus. As the tensile tester, a product name "Autograph AG-10G type tensile tester" manufactured by Shimadzu Corporation can be used. The 5% modulus of the base material can be adjusted by, for example, selection of a base material type (selection of a mixing ratio of a hard component and a soft component), a molding method, and the like.

  Preferably, the film-like substrates disclosed herein exhibit a 100% modulus of less than 10 MPa. When the 100% modulus of the film-like substrate is less than a predetermined value, when the pressure-sensitive adhesive sheet is pulled from the adherend by elongating and deforming, the resistance at the start of pulling becomes small and the tensile-removing property tends to be excellent. is there. The 100% modulus is more preferably less than 5 MPa. Although the lower limit of the 100% modulus is not particularly limited, it is usually suitable to be 0.5 MPa or more (for example, 1 MPa or more) from the viewpoint of the workability of sticking the pressure-sensitive adhesive sheet. The 100% modulus is measured by the same method as in the case of the pressure-sensitive adhesive sheet.

  Preferably, the film-like substrate disclosed herein exhibits a 150% modulus of less than 20 MPa. When the 150% modulus of the film-shaped substrate is set to be less than the predetermined value, when the pressure-sensitive adhesive sheet is removed from the adherend by being stretched and deformed, the resistance at the time of the tension removing operation tends to decrease. The 150% modulus is more preferably less than 15 MPa (eg less than 12 MPa, typically less than 8 MPa). Although the lower limit of the 150% modulus is not particularly limited, it is usually appropriate to set it to 1 MPa or more (for example, 5 MPa or more) from the viewpoint of sticking workability of the pressure-sensitive adhesive sheet. The 150% modulus is measured according to the method for measuring “tensile stress” described in JIS K 7311: 1995. More specifically, using a No. 3 dumbbell-shaped test piece (width 5 mm, mark interval 20 mm), the sample was pulled at a tensile speed of 300 mm / min, and the stress [MPa when the mark length was extended by 150%. ] Is set to 150% modulus. As the tensile tester, a product name "Autograph AG-10G type tensile tester" manufactured by Shimadzu Corporation can be used. The 150% modulus of the base material can be adjusted by, for example, selection of a base material type (selection of a mixing ratio of a hard component and a soft component), a molding method, and the like.

As a film-like substrate (supporting substrate) for supporting (lining) the pressure-sensitive adhesive layer, various film-like substrates can be used. As the base material, for example, a woven fabric film, a nonwoven fabric film, and a resin film can be used. Above all, a resin film is preferable. The resin film may be a non-foamed resin film, a rubbery film, a foamed film, or the like. Of these, non-foamed resin films and rubbery films are preferred, and non-foamed resin films are more preferred. Non-foamed resin films have substantially no air bubbles (voids) that can be a weak point in terms of mechanical strength, and tend to have superior mechanical strength such as tensile strength as compared with foams. The non-foamed resin film is also excellent in workability, dimensional stability, thickness accuracy, economy (cost), and the like.
The “resin film” in this specification is a substantially non-porous film, and has a concept distinguished from a so-called nonwoven fabric or woven fabric (ie, a concept excluding nonwoven fabric or woven fabric). In addition, the non-foamed resin film refers to a resin film that has not been intentionally treated to be a foam. The non-foamed resin film may specifically be a resin film having an expansion ratio of less than 1.1 times (for example, less than 1.05 times, typically less than 1.01 times). The non-foamed resin film includes, for example, soft resin films called soft polyolefin, soft polyurethane, soft polyester, soft polyvinyl chloride, and the like.

  Preferred examples of the resin material constituting the resin film disclosed herein include polyurethanes such as ether-based polyurethane, ester-based polyurethane, and carbonate-based polyurethane; urethane (meth) acrylate-based polymers; polyethylene (PE), and polypropylene (PP). And polyolefins such as ethylene-propylene copolymers and ethylene-butene copolymers; polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate and polybutylene naphthalate; polycarbonates; As the above polyester, polybutylene terephthalate (PBT), polyethylene naphthalate, and polybutylene naphthalate are more preferable. The resin material is a styrene-based copolymer such as a styrene-butadiene copolymer, a styrene-isoprene copolymer, a styrene-ethylene-butylene copolymer, a styrene-ethylene-propylene copolymer, a styrene-butadiene-styrene copolymer, and a styrene-isoprene-styrene copolymer. It may be a coalesced (typically a styrene elastomer), an acrylic copolymer called acrylic rubber, or a vinyl chloride resin (PVC) such as soft polyvinyl chloride. Good. The above resin materials can be used alone or in combination of two or more. The above-mentioned resin materials include those generally called rubber or thermoplastic elastomer.

  In a preferred embodiment, the film substrate is a polyurethane resin film. Here, the polyurethane-based resin film refers to a resin film containing polyurethane as a main component of the resin component (a component having the highest blending ratio, typically a component containing more than 50% by weight; the same applies hereinafter). . Polyurethane resin film is typically composed of a material that does not substantially exhibit a yield point, and is a film material that is easy to realize a pressure-sensitive adhesive sheet that exhibits a predetermined breaking strength and elongation and, if necessary, a tensile recovery rate. It is. Polyurethane-based resin films can also achieve good physical properties without adding additional components such as plasticizers, for example. It can be a material.

  The proportion of polyurethane in the resin component contained in the polyurethane resin film is preferably 70% by weight or more (for example, 80% by weight or more, typically 90% by weight or more and 100% by weight or less). The polyurethane resin film disclosed herein may be a film composed of a polymer blend of polyurethane and another resin. The other resin may be, for example, one or more of acrylic resin, polyolefin, polyester, and polycarbonate. Alternatively, the technology disclosed herein can also be implemented in an embodiment using a base material substantially free of resin components other than polyurethane.

  The polyurethane is a polymer compound synthesized by performing a polyaddition reaction between a polyol (for example, a diol) and a polyisocyanate (for example, a diisocyanate) at a predetermined ratio. The NCO / OH ratio of the polyurethane may be appropriately set based on technical common sense of those skilled in the art so that desired mechanical properties (for example, breaking strength, elongation at break, and tensile recovery rate) are obtained.

  Examples of the polyol that can be used for the synthesis of the polyurethane include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, and 1,6-hexane. Diols such as diol, 1,8-octanediol, polyoxytetramethylene glycol, diethylene glycol, polyethylene glycol, and polypropylene glycol; polyesters which are polycondensates of the above diols with dicarboxylic acids (eg, adipic acid, azelaic acid, sebacic acid) Polyol; carbonate diols such as polyalkylene carbonate diol; and the like. These can be used alone or in combination of two or more.

  Examples of the polyisocyanate that can be used for the synthesis of the polyurethane include aromatic, aliphatic, and alicyclic diisocyanates, and multimers (for example, dimers and trimers) of these diisocyanates. Examples of the diisocyanate include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and 1,3-phenylene diisocyanate. 1,4-phenylene diisocyanate, butane-1,4-diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, cyclohexane-1,4-diisocyanate, dicyclohexylmethane-4 1,4-diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, methylcyclohexyl Down diisocyanate, m- tetramethylxylylene diisocyanate, and the like. These can be used alone or in combination of two or more. Of these, aromatic diisocyanates are preferred.

  In the polyurethane, other copolymer components may be introduced in addition to the polyol and the polyisocyanate. As other copolymerization components, one or more of monocarboxylic acid, dicarboxylic acid, trifunctional or higher polycarboxylic acid, hydroxycarboxylic acid, alkoxycarboxylic acid, and derivatives thereof can be used. The proportion of these other copolymer components is suitably less than 30% by weight (eg, less than 10% by weight, typically less than 5% by weight) in the polyurethane. The technology disclosed herein can also be preferably implemented in an embodiment having a polyurethane-based resin film base material containing, as a main component, polyurethane containing no other copolymer component.

  In another preferred embodiment, the film-shaped substrate is a resin film containing a urethane (meth) acrylate-based polymer. As the urethane (meth) acrylate-based polymer disclosed herein, a polymer containing a structural unit derived from urethane (meth) acrylate can be used. Here, urethane (meth) acrylate refers to a compound having a urethane bond and a (meth) acryloyl group in one molecule, and such a compound can be used without any particular limitation. Urethane (meth) acrylates can be used alone or in combination of two or more. The urethane (meth) acrylate preferably has two or more urethane bonds and two or more (meth) acryloyl groups. The number of the (meth) acryloyl groups in the urethane (meth) acrylate is preferably from 2 to 5, and more preferably from 2 to 3. For example, urethane (meth) acrylate having two (meth) acryloyl groups can be preferably used. Further, the urethane (meth) acrylate is preferably urethane acrylate. Here, the “urethane acrylate” refers to one in which the number ratio of acryloyl groups among the (meth) acryloyl groups included in urethane (meth) acrylate exceeds 50%.

  As the urethane (meth) acrylate, various commercially available urethane (meth) acrylates can be used. For example, a product name “UV-3300B” manufactured by Nippon Synthetic Chemical Industry Co., Ltd., a product name “Beam Set 505A-6” manufactured by Arakawa Chemical Industry Co., Ltd. can be preferably used.

  In another preferred embodiment, the film-shaped substrate is a PVC-based resin film. The PVC resin film is produced by forming a PVC resin composition (molding material) containing a PVC resin into a film. Here, the PVC resin composition refers to a resin composition in which the main component (that is, 50% by weight or more) of the resin component (polymer component) is a PVC resin (typically, PVC). It is preferable that about 80% by weight or more (more preferably about 90% by weight or more) of the total amount of resin components contained in the PVC-based resin composition is a PVC-based resin. Substantially all of the resin component may be PVC. According to such a PVC-based resin composition, a PVC-based resin film exhibiting suitable physical properties as a base material of the pressure-sensitive adhesive sheet can be formed.

  The film-like base material (for example, a resin film base material) may have a filler (inorganic filler, organic filler, etc.), a coloring agent (pigment, dye), an antioxidant, an antioxidant, and an ultraviolet absorber as necessary. Various additives such as an agent, an antistatic agent, a lubricant, a plasticizer, and a stabilizer may be compounded. For example, when a soft PVC resin film is used as the film-like substrate, the blending amount of the plasticizer is about 20 to 100 parts by weight (more preferably about 30 to 70 parts by weight) per 100 parts by weight of the PVC resin. Is appropriate. The mixing ratio of the various additives is usually less than 30% by weight (for example, less than 20% by weight, typically less than 10% by weight).

  Conventionally known surface treatments such as a corona discharge treatment, a plasma treatment, an ultraviolet irradiation treatment, an acid treatment, an alkali treatment, and the application of a primer may be applied to the surface of the film-shaped substrate. Such a surface treatment may be a treatment for improving the adhesion between the film-shaped substrate and the pressure-sensitive adhesive layer, in other words, the anchoring property of the pressure-sensitive adhesive layer on the substrate. When the film-like substrate is a polyurethane-based resin film, good anchoring properties can be obtained even if the above-mentioned surface treatment is not performed, due to the high surface energy.

  The film-shaped substrate may have a single-layer structure, a two-layer structure, a three-layer structure or a multi-layer structure of more layers. In the case of a multi-layer structure, at least one layer (preferably all layers) is preferably a layer having a continuous structure of the resin (more preferably polyurethane). The method for producing the film-shaped substrate is not particularly limited as long as a conventionally known method is appropriately employed. When a resin film substrate is employed as the film substrate, for example, extrusion molding, inflation molding, T-die cast molding, and a conventionally known general film forming method such as calender roll molding are appropriately employed. A resin film substrate can be used.

  The thickness of the film-shaped substrate is not particularly limited, and can be appropriately selected depending on the purpose. Usually, it is appropriate that the thickness is 10 μm or more, and it is preferably about 30 μm or more (for example, 40 μm or more, typically 70 μm or more). A film-like substrate having the above thickness is difficult to be broken and can be excellent in tensile removability. It is appropriate that the thickness of the film-shaped substrate is 3 mm or less (for example, 2 mm or less, typically 1.5 mm or less). Further, the thickness of the film-shaped substrate is preferably 300 μm or less, more preferably 200 μm or less (for example, 150 μm or less, typically 120 μm or less). For example, the above thickness is preferably adopted for a non-foamed resin film substrate. According to the technology disclosed herein, even in a configuration using a base material having a thickness equal to or less than the above-described predetermined thickness, it is possible to achieve good tensile removability. Reducing the thickness of the film-shaped substrate is advantageous in terms of reducing the thickness of the pressure-sensitive adhesive sheet, miniaturizing it, reducing its weight, saving resources, and the like.

<Release liner>
As the release liner, a conventional release paper or the like can be used and is not particularly limited. For example, a release liner having a release treatment layer on the surface of a liner substrate such as a resin film or paper, or a low-adhesion material such as a fluoropolymer (such as polytetrafluoroethylene) or a polyolefin resin (such as polyethylene or polypropylene). A release liner or the like can be used. The release treatment layer may be formed, for example, by subjecting the liner substrate to a surface treatment with a release treatment agent such as a silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide.

<Tab>
As described above, the tab disclosed herein is not limited in shape, material, and the like as long as the tab exerts its function. The tab basically has a planar shape, and functions as a tab when viewed from above, such as a triangle, a circle, an ellipse, a semicircle, a semi-ellipse, and a band. Various shapes can be adopted within the range in which they are exhibited. The tab according to a preferred embodiment is a rectangular resin film. The material of the tab may be any material having a rigidity enough to withstand the tension when the adhesive sheet is removed. For example, the material exemplified as the material of the above-mentioned film-like base material (eg, a resin film such as a PET film, a nonwoven fabric, a woven fabric) Cloth or the like).

  The tab preferably has a breaking strength of 10 MPa or more. This prevents damage such as breakage of the tab when the adhesive sheet is peeled off. Also, it tends to have excellent workability. The breaking strength is more preferably 20 MPa or more, and still more preferably 30 MPa or more (for example, 45 MPa or more, typically 60 MPa or more). The breaking strength is measured by the method described above.

  At least one of the outer surfaces of the tab (at least one (preferably both) of the front (front) side and the back (back) side) is typically non-tacky and at least low tacky Preferably, there is. Specifically, the outer surface of the tab may exhibit a peel strength of less than 1 N / 20 mm (180 ° peel strength to stainless steel plate). The peel strength is measured by the method described above. In the present specification, a surface having a peel strength of less than 1 N / 20 mm (typically, the outer surface of the tab) is referred to as “non-adhesive”. In addition, that the outer surface of the tab has low adhesiveness means that the outer surface of the tab has an adhesive force (typically with respect to SUS180) as compared with the surface (adhesive surface) of the adhesive sheet that constitutes the adhesive product with the tab together with the tab. (Peeling strength) is low. The tab is typically non-tacky on both sides of its outer surface, but one may be non-tacky and the other low tack.

  Although the thickness of the tab is not particularly limited, it is preferable that the tab has a predetermined thickness or more in order to have a strength that does not break when the adhesive sheet is pulled. Usually, the thickness of the tab is suitably 10 μm or more, and preferably about 30 μm or more (for example, 40 μm or more, typically 70 μm or more). The thickness of the tab is suitably 3 mm or less (eg, 2 mm or less, typically 1.5 mm or less), and the thickness of the tab 50 is preferably 300 μm or less, and 200 μm or less (eg, 150 μm or less). Hereinafter, typically, it is more preferably 120 μm or less.

<Application>
The adhesive product with a tab disclosed herein is not particularly limited. For example, a metal material such as stainless steel (SUS) and aluminum; an inorganic material such as glass and ceramics; nylon, polycarbonate (PC), and polymethyl methacrylate (PMMA) ), A resin material such as polypropylene or polyethylene terephthalate (PET); a rubber material such as natural rubber or butyl rubber; and an adherend having a surface made of a composite material thereof.

  The adhesive product with a tab disclosed herein can be smoothly peeled from the adherend (typically, peeling by pulling). Taking advantage of this feature, it is preferably used as an adhesive product for various uses that can be peeled off after application. For example, for fixing a protection panel (lens) that protects the display unit of electronic equipment, fixing a decoration panel of a display (for example, a display of a television), fixing a battery pack of a personal computer, and waterproofing a lens of a digital video camera. Adhesive products with tabs disclosed herein can be employed. Above all, it is preferable to use it as a tabbed adhesive product for portable electronic devices, which requires a certain level of adhesive strength at the time of use, but requires smooth removal during repair, replacement, inspection, recycling, etc. of components. it can. For example, mobile phones, smartphones, tablet computers, notebook computers, various wearable devices (for example, a wrist wear type to be worn on the wrist like a wristwatch, a modular type to be worn on a part of the body with clips or straps, a glasses type) (Eyewear type including monocular type and binocular type, including head mounted type), clothing type attached to shirts, socks, hats, etc. in the form of accessories, earwear type attached to ears like earphones, etc.), Digital cameras, digital video cameras, audio equipment (portable music players, IC recorders, etc.), calculators (calculators, etc.), portable game devices, electronic dictionaries, electronic notebooks, electronic books, in-vehicle information devices, portable radios, portable TVs, portables In portable electronic devices such as printers, portable scanners, and portable modems, protect the display Protective panel (lens) fixing, key module member fixing, rim sheet fixing, decoration panel fixing, battery fixing, and other various members (circuit boards, various panel members, buttons, lighting equipment members, internal camera members, heat dissipating materials, graphite sheets) And fixing of display objects (including various marks) such as logos (design letters) and various designs. Among the tabbed pressure-sensitive adhesive products disclosed herein, those exhibiting a predetermined or higher adhesive strength, when used in the above-mentioned portable electronic device, adhere to the impact when the portable electronic device falls. The fixed arrangement of the members may be maintained. This is particularly advantageous in battery fastening applications. This is because a battery to be fixed can expand due to use over time, and therefore a gap is provided around the battery, and fixing failure (peeling off of the adhesive sheet) due to a drop impact or the like tends to be a significant defect. . In this specification, “portable” means that it is not enough to simply carry a portable device, and that an individual (standard adult) has a level of portability that can be relatively easily carried. Shall mean.

  Further, the adhesive product with a tab having excellent tensile removability is suitable as an adhesive product with a tab used for fixing a battery (including a primary battery and a secondary battery, for example, a polymer battery) in a portable electronic device. The battery is usually placed in a place that needs to be removed when repairing, replacing, inspecting, or the like, a component (including the battery) of the portable electronic device. Therefore, the adhesive product for fixing the battery frequently needs to be removed. However, removing the battery by physical means such as use of a removal tool, manual peeling, and heating may damage the battery and may be undesirable in terms of safety. The reduction of the peeling force by light curing is not effective because the irradiation is performed through the battery due to the location of the adhesive product. The adhesive product with a tab disclosed herein exerts the function of fixing the battery well, and utilizes the above-described pull-out (typically, pull-out) method when removing the battery after the end of its use. Thus, it can be easily removed. The above-mentioned adhesive product is particularly preferable as an adhesive product used for fixing a polymer battery. Polymer batteries tend to be more deformable than other types of batteries (typically batteries with metal cases), so conventional peeling methods can deform the battery and impair its functionality. there were. According to the tabbed pressure-sensitive adhesive product disclosed herein, it is possible to effectively remove the tabbed pressure-sensitive adhesive product while suppressing deformation of the polymer battery by using the above-described pull-out (typically, pull-out) method. it can.

  In addition, if the adhesive product with a tab used for fixing the battery of a portable battery device cannot be pulled in parallel with the shearing direction at the time of removal due to other parts existing around the battery or the arrangement of the battery, etc. There are many. In such a case, the tabbed adhesive product should be removed by being pulled at a non-parallel angle to the adhesive surface (for example, an angle of 45 degrees or more and 90 degrees or less, typically 70 degrees or more and less than 90 degrees). In the removal, there is a possibility of damage due to contact with an adherend (battery) or an obstacle. According to the technology disclosed herein, even in such a removal mode, the adhesive product with a tab can be preferably removed without being damaged.

  Further, the adhesive product with a tab having excellent pull-out property (typically, pull-out property) is attached to a wall surface, a pillar, furniture, a home appliance, a glass surface, and the like, and is used after being used for a predetermined period and then replaced. It is also suitable as an adhesive product used for fixing an article or a component (an adherend, an object to be fixed, an object to be attached, etc.). Also in this application, while fixing the article, etc., the adhesive product exhibits a good fixing function, and when removing the article, etc., grasp the tab etc. provided on the adhesive product and pull out the entire adhesive product. Accordingly, removal of the adhesive product (for example, removal in the direction of the arrow in FIG. 14C) can be performed efficiently.

  As described above, the specific examples of the present invention have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and alterations of the specific examples illustrated above. When there are a plurality of embodiments, the configurations described in the different embodiments can be appropriately combined. Therefore, embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

The matters disclosed by this specification include the following.
(1) An adhesive product with a tab, comprising an extensible adhesive sheet and a tab fixed to the adhesive sheet,
The adhesive product with a tab, wherein the tab includes: a first tab film fixed to a first surface of the adhesive sheet; and a second tab film fixed to a second surface of the adhesive sheet.
(2) The adhesive product with a tab according to (1), wherein the first tab film is smaller than the second tab film.
(3) The first surface of the pressure-sensitive adhesive sheet to which the first tab film is fixed has an attaching portion attached to an adherend and an exposed portion protruding from the attaching surface of the adherend. Yes,
The adhesive product with a tab according to the above (2), wherein the exposed portion is located between the attaching portion and the first tab film.
(4) The adhesive product with a tab according to any one of (1) to (3), wherein the first tab film has a thickness different from that of the second tab film.
(5) The adhesive product with a tab according to any one of (1) to (4), wherein the first tab film is made of a material different from that of the second tab film.
(6) The adhesive product with a tab according to any one of (1) to (5), wherein the first tab film and the second tab film do not protrude from the adhesive sheet.
(7) The pressure-sensitive adhesive product with a tab according to any one of (1) to (6), wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet.
(8) The pressure-sensitive adhesive sheet includes a film-like substrate, a first pressure-sensitive adhesive layer provided on a first surface of the film-like substrate, and a second pressure-sensitive adhesive layer provided on a second surface of the film-like substrate. The adhesive product with a tab according to the above (7), comprising an agent layer.
(9) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet interposed therebetween, the tab is pulled to extend the adhesive sheet, and the two objects are extended. The adhesive product with a tab according to the above (7) or (8), wherein the bonded state is released.
(10) The adhesive product with a tab according to any one of (1) to (9), which is used for fixing a battery of a portable electronic device.

(11) The pressure-sensitive adhesive sheet includes a pressure-sensitive adhesive layer,
The pressure-sensitive adhesive layer contains an acrylic polymer in a proportion exceeding 50% by weight of a polymer component contained in the pressure-sensitive adhesive layer,
The acrylic polymer has the following formula (1) as a monomer component:
CH ₂ ＣC (R ¹ ) COOR ² (1)
(In the above formula (1), R ¹ is a hydrogen atom or a methyl group. R ² is a linear alkyl group having 1 to 20 carbon atoms.) The pressure-sensitive adhesive product with a tab according to any one of the above (1) to (10), containing the content in an amount of 70% by weight or more.
(12) The alkyl (meth) acrylate is methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, s -Butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate , Nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate G, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate and eicosyl (meth) acrylate The adhesive product with a tab according to the above (11), which is at least one selected from the group consisting of:
(13) The acrylic polymer further includes a functional group-containing monomer as the monomer component,
The functional group-containing monomer includes acrylic acid, methacrylic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and 4 -The pressure-sensitive adhesive product with a tab according to the above (11) or (12), which is at least one selected from the group consisting of -hydroxybutyl (meth) acrylate.
(14) The pressure-sensitive adhesive layer contains a tackifier resin having a softening point of 100 ° C. or higher,
The pressure-sensitive adhesive product with a tab according to any one of (11) to (13), wherein the tackifier resin includes at least one of a rosin-based tackifier resin and a terpene-based tackifier resin.
(15) The adhesive product with a tab according to any of (11) to (14), wherein the adhesive layer contains 10 to 60 parts by weight of a tackifier based on 100 parts by weight of the acrylic polymer.
(16) The pressure-sensitive adhesive product with a tab according to any one of (11) to (15), wherein the pressure-sensitive adhesive layer contains an acrylic oligomer.
(17) The pressure-sensitive adhesive layer contains filler particles,
The filler particles include aluminum, chromium, iron, stainless steel, aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, zinc oxide, tin oxide, copper oxide, nickel oxide, aluminum hydroxide, boehmite, magnesium hydroxide, and calcium hydroxide. , Zinc hydroxide, silicic acid, iron hydroxide, copper hydroxide, barium hydroxide, zirconium oxide hydrate, tin oxide hydrate, basic magnesium carbonate, hydrotalcite, dawsonite, borax, zinc borate, silicon carbide (11) to (11) to which are at least one selected from the group consisting of boron carbide, nitrogen carbide, calcium carbide, aluminum nitride, silicon nitride, boron nitride, gallium nitride, calcium carbonate, barium titanate and potassium titanate. The adhesive product with a tab according to any one of (16).

(18) The film according to any of the above (11) to (17), further comprising a film-shaped substrate supporting the pressure-sensitive adhesive layer, wherein the film-shaped substrate is a resin film substrate having an expansion ratio of less than 1.1 times. An adhesive product with a tab according to any of the above.
(19) The film-form substrate according to the above (18), wherein the film-shaped base material includes at least one resin material selected from the group consisting of polyurethane, urethane (meth) acrylate-based polymer, polyolefin, polyester, and polyvinyl chloride. Adhesive products with tabs.
(20) The film-like substrate contains polyurethane in a proportion of 70% by weight or more,
The adhesive product with a tab according to the above (18) or (19), wherein the polyurethane is an ether-based polyurethane, an ester-based polyurethane, or a carbonate-based polyurethane.

(21) An adhesive product with a tab, comprising an extensible adhesive sheet and a tab provided at an end of the adhesive sheet,
The pressure-sensitive adhesive sheet according to any one of (1) to (20), wherein the pressure-sensitive adhesive sheet has a sticking portion to be stuck to an adherend, and a non-sticking portion located between the sticking portion and the tab. Adhesive products with tabs.
(22) When the tab is pulled in a state where the sticking portion is adhered to the adherend, the non-stick portion extends with priority over the sticking portion, and the stretching causes the sticking portion to adhere to the adherend. The adhesive product with a tab according to the above (21), which starts to peel off from the body.
(23) The adhesive product with a tab according to the above (21) or (22), wherein the adhesive sheet has a band shape, and the tab is fixed to one end in a longitudinal direction of the adhesive sheet.
(24) The pressure-sensitive adhesive product with tab according to (23), wherein a ratio (L / W) of a length L to a width W of the pressure-sensitive adhesive sheet is 2 or more.
(25) The pressure-sensitive adhesive product with a tab according to any of (21) to (24), wherein an area ratio of the non-sticking part in the pressure-sensitive adhesive sheet is 1 to 10%.
(26) The pressure-sensitive adhesive product with a tab according to any of (21) to (25), wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet.
(27) The pressure-sensitive adhesive sheet includes a film-shaped substrate, a first pressure-sensitive adhesive layer provided on a first surface of the film-shaped substrate, and a second pressure-sensitive adhesive layer provided on a second surface of the film-shaped substrate. The adhesive product with a tab according to the above (26), comprising: an agent layer.
(28) Used to join two objects, and in a state where the two objects are joined with the adhesive sheet interposed therebetween, the tab is pulled to extend the adhesive sheet, and the two objects are stretched. The adhesive product with a tab according to the above (26) or (27), wherein the bonded state is released.
(29) In a state where the two objects are joined with the adhesive sheet interposed therebetween, the non-sticking portion and the tab are exposed to the outside of the two objects, and the non-sticking portion is connected to the two objects. The adhesive product with a tab according to any one of (26) to (28), wherein the tab is along the outer surface of the one object by being brought into contact with one of the objects.
(30) The adhesive product with a tab according to any one of (21) to (29), which is used for fixing a battery of a portable electronic device.

(31) An adhesive product with a tab, comprising: an extensible adhesive sheet; and a tab provided at an end of the adhesive sheet,
The pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet,
The pressure-sensitive adhesive sheet has an attaching portion for joining two objects, and an anchor portion fixed to only one of the two objects,
The adhesive product with a tab according to any one of the above (1) to (30), wherein the attaching section is disposed between the anchor section and the tab.
(32) In the state where the two objects are joined with the adhesive sheet interposed therebetween, the adhesive sheet is extended by pulling the tab, and the joined state of the two objects is released. 3.) An adhesive product with a tab according to (1).
(33) When the tab is pulled in a state where the sticking portion is bonded to the two objects, the sticking portion is extended and peeled from the two objects, and the anchor portion is fixed to one of the two objects. The adhesive product with a tab according to the above (31) or (32), which is held in a state.
(34) The adhesive product with a tab according to any one of (31) to (33), wherein the adhesive sheet is extended by elastic deformation.
(35) The pressure-sensitive adhesive sheet has a band shape, the tab is fixed to one longitudinal end of the pressure-sensitive adhesive sheet, and the anchor portion is located at the other longitudinal end of the pressure-sensitive adhesive sheet. The adhesive product with a tab according to any one of (31) to (34).
(36) The pressure-sensitive adhesive product with a tab according to (35), wherein the pressure-sensitive adhesive sheet has a band shape extending linearly or in a curved shape.
(37) The adhesive product with a tab according to the above (35) or (36), wherein a ratio (L / W) of a length L to a width W of the adhesive sheet is 2 or more.
(38) The adhesive product with a tab according to any of (31) to (37), wherein an area ratio of the anchor portion in the adhesive sheet is 1 to 10%.
(39) The pressure-sensitive adhesive sheet includes a film-shaped substrate, a first pressure-sensitive adhesive layer provided on a first surface of the film-shaped substrate, and a second pressure-sensitive adhesive layer provided on a second surface of the film-shaped substrate. The adhesive product with a tab according to any one of the above (31) to (38), comprising: an agent layer.
(40) The adhesive product with a tab according to any one of (31) to (39), which is used for fixing a battery of a portable electronic device.

(41) An adhesive product with a tab, comprising an extensible adhesive sheet and a tab provided at an end of the adhesive sheet,
The pressure-sensitive adhesive product with a tab according to any one of (1) to (40), wherein the pressure-sensitive adhesive sheet has a band shape, and the band shape of the pressure-sensitive adhesive sheet has a bent portion.
(42) The pressure-sensitive adhesive product with a tab according to the above (41), wherein the pressure-sensitive adhesive sheet has a shape along at least a part of an outer periphery of a surface of an adherend to which the pressure-sensitive adhesive sheet is attached.
(43) The adhesive product with a tab according to the above (41) or (42), wherein the adhesive sheet has a U shape.
(44) The adhesive product with a tab according to (41) or (42), wherein the adhesive sheet has a corrugated shape.
(45) The pressure-sensitive adhesive product with a tab according to any of (41) to (44), wherein the pressure-sensitive adhesive sheet has a breaking strength of 10 MPa or more.
(46) The pressure-sensitive adhesive product with a tab according to any of (41) to (45), wherein the width of the pressure-sensitive adhesive sheet is 5 mm or less.
(47) The pressure-sensitive adhesive product with a tab according to any of (41) to (46), wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet.
(48) The pressure-sensitive adhesive sheet includes a film-like substrate, a first pressure-sensitive adhesive layer provided on a first surface of the film-like substrate, and a second pressure-sensitive adhesive layer provided on a second surface of the film-like substrate. The adhesive product with a tab according to the above (47), comprising an agent layer.
(49) Used to join two objects, and in a state where the two objects are joined with the adhesive sheet interposed therebetween, the tab is pulled to extend the adhesive sheet, and the two objects are stretched. The adhesive product with a tab according to the above (47) or (48), wherein the bonded state is released.
(50) The adhesive product with a tab according to any of (41) to (49), which is used for fixing a battery of a portable electronic device.

(51) An adhesive product with a tab including an extensible adhesive sheet and a tab provided at an end of the adhesive sheet,
The pressure-sensitive adhesive sheet has a band shape,
The adhesive product with a tab according to any one of (1) to (50), wherein a maximum width of the adhesive sheet is larger than a width of the tab.
(52) The pressure-sensitive adhesive product with a tab according to the above (51), wherein the pressure-sensitive adhesive sheet has a portion whose width increases in a longitudinal direction of the pressure-sensitive adhesive sheet as the distance from the tab increases.
(53) The pressure-sensitive adhesive product with a tab according to the above (51) or (52), wherein the pressure-sensitive adhesive sheet has a portion in a longitudinal direction of the pressure-sensitive adhesive sheet, the width of which increases linearly as the distance from the tab increases.
(54) The width of the pressure-sensitive adhesive sheet according to any one of the above (51) to (53), wherein, in the longitudinal direction of the pressure-sensitive adhesive sheet, the width increases as the distance from the tab increases, reaches a maximum width, and then tapers. Adhesive products with tabs.
(55) The pressure-sensitive adhesive product with a tab according to any of (51) to (54), wherein the pressure-sensitive adhesive sheet exhibits a breaking strength of 10 MPa or more.
(56) The adhesive product with a tab according to any of (51) to (55), wherein a concave step is formed on a surface of the tab.
(57) The pressure-sensitive adhesive product with a tab according to any of (51) to (56), wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet.
(58) The pressure-sensitive adhesive sheet comprises a film-shaped substrate, a first pressure-sensitive adhesive layer provided on a first surface of the film-shaped substrate, and a second pressure-sensitive adhesive layer provided on a second surface of the film-shaped substrate. The adhesive product with a tab according to the above (57), comprising an agent layer.
(59) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet interposed therebetween, the tab is pulled to extend the adhesive sheet, and the two objects are stretched. The adhesive product with a tab according to the above (57) or (58), wherein the joined state of the tabs is released.
(60) The adhesive product with a tab according to any of (51) to (59), which is used for fixing a battery of a portable electronic device.

(61) comprising an extensible adhesive sheet and a tab,
The pressure-sensitive adhesive product with a tab according to any one of (1) to (60), wherein the pressure-sensitive adhesive sheet has a plurality of portions extending from the tab.
(62) The pressure-sensitive adhesive sheet is composed of two or more pressure-sensitive adhesive sheet pieces,
The adhesive product with a tab according to the above (61), wherein the two or more adhesive sheet pieces are respectively connected to the tabs.
(63) Each of the two or more pressure-sensitive adhesive sheet pieces has a band shape and is arranged to extend in the longitudinal direction of each pressure-sensitive adhesive sheet piece when the tab is pulled. An adhesive product with a tab according to 62).
(64) The tabbed pressure-sensitive adhesive product according to (63), wherein each of the two or more pressure-sensitive adhesive sheet pieces has a tab fixed to an end thereof.
(65) The adhesive product with a tab according to (64), wherein the two or more adhesive sheet pieces are arranged in parallel with each other.
(66) The pressure-sensitive adhesive product with a tab according to any of (61) to (65), wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet.
(67) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet interposed therebetween, the tab is pulled to extend the adhesive sheet, and the two objects are stretched. The adhesive product with a tab according to the above (66), wherein the bonded state is released.
(68) used for joining two or more members to a substrate,
The adhesive product with a tab according to (66), wherein each of the adhesive sheet pieces joins each of the two or more members to the base material.
(69) The tab has two or more pressure-sensitive adhesive sheet piece fixing portions for fixing each of the two or more pressure-sensitive adhesive sheet pieces,
The adhesive product with a tab according to the above (67) or (68), wherein the two or more adhesive sheet piece fixing portions are connected so as to be separable from each other.
(70) The adhesive product with a tab according to any of (61) to (69), which is used for fixing a battery of a portable electronic device.

A Object (adherend)
501, 502, 503 Adhesive products with tabs 510, 710 (extensible) adhesive sheet 510A First surface of adhesive sheet 510B Second surface of adhesive sheet 512 Adhesion part 518 Exposed part 550 Tab 560 First tab film 562 Second tab film 720 film base material 721, 722 adhesive layer

Claims (9)

An extensible pressure-sensitive adhesive sheet, and a tab fixed to the pressure-sensitive adhesive sheet, a pressure-sensitive adhesive product comprising a tab,
The tab includes a first tab film fixed to a first surface of the pressure-sensitive adhesive sheet, and a second tab film fixed to a second surface of the pressure-sensitive adhesive sheet,
The first tab film is smaller than the second tab film,
The pressure-sensitive adhesive sheet has a band shape, the first tab film and the second tab film are attached to an end region of the pressure-sensitive adhesive sheet,
The pressure-sensitive adhesive sheet includes a film-like substrate,
The tab is a resin film formed of at least one resin material selected from the group consisting of polyurethane, urethane (meth) acrylate-based polymer, polyolefin, polyester, polycarbonate, and vinyl chloride-based resin. With adhesive products. The first surface of the pressure-sensitive adhesive sheet to which the first tab film is fixed has a sticking portion that is stuck to an adherend, and an exposed portion that protrudes from the sticking surface of the adherend,
The adhesive product with a tab according to claim 1 , wherein the exposed portion is located between the attaching portion and the first tab film. It said first tab film has a thickness different from the second tab film, tabbed adhesive product according to claim 1 or 2. The adhesive product with a tab according to any one of claims 1 to 3 , wherein the first tab film is made of a material different from that of the second tab film. The adhesive product with a tab according to any one of claims 1 to 4 , wherein the first tab film and the second tab film do not protrude from the adhesive sheet. The pressure-sensitive adhesive product with a tab according to any one of claims 1 to 5 , wherein the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet. The adhesive sheet comprises a first adhesive layer provided on the first surface of the film-form substrate, a second pressure-sensitive adhesive layer provided on the second surface of the film-form substrate, a claim The adhesive product with a tab according to any one of claims 1 to 6 . It is used for joining two objects, and in a state where the two objects are joined with the adhesive sheet interposed therebetween, the adhesive sheet is stretched by pulling the tab, and the joined state of the two objects The adhesive product with a tab according to claim 6, wherein the pressure-sensitive adhesive is released. The adhesive product with a tab according to any one of claims 1 to 8 , which is used for fixing a battery of a portable electronic device.

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