JP2017075232A - Adhesive product with tab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive product with a tab capable of exhibiting an adhesive function equivalent to a case where two or more pieces of adhesive product with a tab are used, and allowing an excellent removal operation when removing the pressure sensitive adhesive sheet.SOLUTION: An adhesive product with a tab includes an extensible pressure sensitive adhesive sheet and a tab. In the adhesive product with a tab, the pressure sensitive adhesive sheet includes a plurality of portions extending from the tab.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tabbed adhesive product.

  In general, a pressure-sensitive adhesive (also referred to as a pressure-sensitive adhesive; the same shall apply hereinafter) is in the form of a soft solid (viscoelastic body) in a temperature range near 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. In addition, the pressure-sensitive adhesive sheet attached to the adherend can be removed from the adherend when the adherend and its peripheral members are repaired or replaced, inspected, recycled, or the like. Patent documents 1-6 are mentioned as literature which discloses the prior art about this kind of releasable adhesive sheet. Patent documents 1-6 are all disclosing the prior art regarding the extensible adhesive sheet which has a tab. Patent Document 1 relates to a medical pressure-sensitive adhesive sheet that is attached to the skin.

JP-T-2005-500133 JP 2000-96006 A JP 2000-96007 A JP 2002-235046 A JP 2002-235058 A Special table 2010-531917 gazette

  When the pressure-sensitive adhesive sheet is removed from the adherend, it is desirable that the removal operation is completed without the adherend being deformed or damaged regardless of the strength of the adherend. As one means, Patent Documents 2 to 6 disclose methods using an extensible adhesive sheet. In this method, a tab is provided at the end of the extensible adhesive sheet, and the adhesive sheet is stretched and deformed by gripping and pulling the tab after the adhesive sheet is attached, thereby reducing the adhesion area. As a result, the adhesive sheet is removed from the adherend. Since this adhesive sheet has extensibility, the load on the adherend when the adhesive sheet is peeled off is significantly reduced.

  As a usage aspect of the adhesive product with a tab of the said structure, the aspect which uses several adhesive products with respect to the said object according to the size, shape, etc. of the object which is affixing object is mentioned. In this aspect, by using two or more adhesive products, for example, the joining state of two objects can be improved. On the other hand, when removing the adhesive product, it is necessary to pull out the adhesive product one by one, and the removal work is troublesome.

  Moreover, even in the configuration in which the load on the adherend is reduced as described above, the adherend may be loaded and the adherend may be damaged. Specifically, when two or more adhesive products are used in the joining of two objects to improve the joining state, when the joining of the two objects is released, the adhesive product is used as described above. Will be pulled out one by one. At this time, since the other adhesive product is pulled in a state where the two objects are bonded and fixed by one adhesive product, a strain load may be generated on the adherend object.

  The present invention has been created in view of the above circumstances, and can exhibit an adhesive function equivalent to that when two or more tabbed adhesive products are used, and when removing the adhesive sheet. An object of the present invention is to provide a pressure-sensitive adhesive product with a tab that can be efficiently removed.

According to this invention, the adhesive product with a tab provided with an extensible adhesive sheet and a tab is provided. In this tabbed adhesive product, the adhesive sheet has a plurality of portions extending from the tab.
According to said structure, each part extended from the tab of an adhesive sheet can be affixed on two places of one object (adhered body). It is also possible to assign a plurality of portions extending from the tab to a plurality of objects (adherents, which may be articles or members), respectively. And when removing an adhesive sheet, the adhesive sheet which has a some part extended from a tab can be efficiently peeled by pulling a tab. Therefore, according to the present invention, it is possible to perform the same adhesive function as when two or more tabbed pressure-sensitive adhesive products are used, and when removing the pressure-sensitive adhesive sheet, the tabbed pressure-sensitive adhesive can be efficiently removed. Product is realized.
Furthermore, for example, when a plurality of parts extending from the tab of the adhesive sheet are used for joining two objects, the entire adhesive sheet is pulled by pulling the tab when releasing the joining of the two objects. The pressure-sensitive adhesive sheet is peeled relatively uniformly from the object to which the sheet is attached. In other words, according to the above aspect, it is possible to prevent or reduce the strain load on the adherend due to the object being the object being pulled unevenly. Therefore, the adhesive product with a tab of the present invention can have a small load on the adherend when removed.

  In a preferred aspect of the technology disclosed herein, the pressure-sensitive adhesive sheet is composed of two or more pressure-sensitive adhesive sheet pieces. The two or more adhesive sheet pieces are connected to the tabs, respectively. According to said structure, two or more adhesive sheet pieces can be pulled simultaneously by pulling a tab, and a some adhesive sheet piece can be efficiently peeled from a to-be-adhered body. For example, when two or more adhesive sheet pieces are used for joining two objects, all the adhesive sheet pieces can be pulled simultaneously when releasing the joining of the two objects. Therefore, as compared with the case where the pressure-sensitive adhesive sheet pieces are peeled one by one, the pressure-sensitive adhesive sheet is evenly peeled from the object that is the adherend. As a result, it is possible to prevent or reduce the strain load on the object. In addition, since the pressure-sensitive adhesive sheet piece has two or more pressure-sensitive adhesive sheet pieces, by using this, one or more pressure-sensitive adhesive products can be used to join two or more members to the base object (base material). Is also possible. In this case, the joining of the two or more members and the base material (the base material to be attached) can be released collectively by an operation of pulling the tab. In addition, an adhesive sheet piece is a typical example of the part extended from the said tab. The plurality of adhesive sheet pieces are typically separated from each other, but may be connected to each other.

  In a preferred aspect of the technology disclosed herein, each of the two or more adhesive sheet pieces has a band shape, and extends in the longitudinal direction of each adhesive sheet piece when the tab is pulled. Are arranged as follows. By comprising in this way, if a tab is pulled in order to remove an adhesive sheet, each adhesive sheet piece will be extended in a longitudinal direction and will peel from an adherend smoothly. In a more preferred aspect, each of the two or more pressure-sensitive adhesive sheet pieces has a tab fixed to the end thereof.

  In a preferred aspect of the technology disclosed herein, the two or more pressure-sensitive adhesive sheet pieces are arranged in parallel to each other. With this configuration, for example, when two or more adhesive sheet pieces are used for joining two objects, a good joining function can be maintained with a smaller adhesion area. Alternatively, when two or more members are aligned and bonded to the base object (base material), each adhesive sheet piece can be assigned to each member and used. Furthermore, when removing the adhesive sheet, all the adhesive sheet pieces can be efficiently peeled by pulling the tab.

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

  In a preferred aspect of the technology disclosed herein, the tabbed adhesive product is used to join two objects. In addition, in the adhesive product with a tab, when the two objects are joined with the adhesive sheet sandwiched therebetween, the adhesive sheet is extended by pulling the tab, and the joined state of the two objects is released. Is possible. By pulling the adhesive product with tabs in the manner as described above, the joined state of the two objects can be smoothly released. Note that the two objects may be two places of one article or one member.

  In a preferred embodiment of the technology disclosed herein, the tabbed adhesive product is used to join two or more members to a base material (a base material to be attached). Moreover, each of the said adhesive sheet piece joins each of the said 2 or more member to the said base material. In a more preferred embodiment, the pressure-sensitive adhesive product with a tab is such that the pressure-sensitive adhesive sheet piece is extended by pulling the tab in a state where the two or more members and the base material are joined with the pressure-sensitive adhesive sheet piece interposed therebetween. The joined state between the two or more members and the base material can be released. The tabbed pressure-sensitive adhesive product disclosed herein is preferably used in the above-described embodiment, and thereafter, when the pressure-sensitive adhesive product is removed, the bonding between the base material and all the members can be collectively released by a pulling operation.

  In a preferred aspect of the technology disclosed herein, the tab includes two or more adhesive sheet piece fixing portions that fix each of the two or more adhesive sheet pieces. The two or more adhesive sheet piece fixing portions are connected in a state where they can be separated from each other. By comprising in this way, when using a some adhesive sheet piece for joining of two objects, at the time of adhesive sheet removal, by pulling a tab with the adhesive sheet piece fixing | fixed part connected, 2 The above adhesive sheet pieces can be pulled at the same time to release the joined state of the two objects. In addition, when a plurality of pressure-sensitive adhesive sheet pieces are assigned to a plurality of members and bonded to a base material (a base material to be attached), the pressure-sensitive adhesive sheet piece fixing portion is separated when removing the pressure-sensitive adhesive sheet. Only the pressure-sensitive adhesive sheet piece corresponding to the member to be removed from the substrate can be selected and pulled out. Thereby, about the member which wants to continue a joining state with a base material, a joining state can be maintained continuously.

  The tabbed adhesive product disclosed herein is preferably used for portable electronic devices. The adhesive product with tabs disclosed here can exhibit the same adhesive function as when two or more adhesive products with tabs are used, and can be removed efficiently when the adhesive sheet is removed. It is. In addition, the load on the adherend may be small when removing the adhesive sheet. Utilizing this feature, it is particularly preferably used as a pressure-sensitive adhesive product for fixing a battery, which is frequently removed when repairing or exchanging members constituting an electronic device, product inspection, or the like. According to the technology disclosed herein, a tabbed adhesive product is provided that is preferably used, for example, to secure one or more batteries. Therefore, according to the present specification, a portable electronic device in which a member (for example, one or two or more batteries) is fixed by an adhesive product with a tab is provided.

It is the schematic diagram which looked at one structural example (embodiment 1) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object) from the upper surface. It is the schematic diagram which looked at the other structural example (Embodiment 2) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object) from the upper surface. It is a top view which shows typically one structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object). It is a figure corresponding to FIG. 3, Comprising: It is a schematic diagram for demonstrating the role of the non-sticking part when peeling an adhesive product with a tab from a to-be-adhered body. It is a top view which shows typically one structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object). It is the schematic diagram which looked at one structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object) from the upper surface. It is the schematic diagram which looked at another structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object) from the upper surface. It is the schematic diagram which looked at another structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object) from the upper surface. It is a top view which shows typically one structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object). It is a top view which shows typically another structural example (reference embodiment) of the adhesive product with a tab in the state affixed on the to-be-adhered body (object). It is a side view which shows typically one structural example (reference embodiment) of the adhesive product with a tab. It is a typical side view which expands and shows a part of other one structural example (reference embodiment) of the adhesive product with a tab. It is a typical side view which expands and shows a part of other one structural example (reference embodiment) of the adhesive product with a tab. It is a typical side view for explaining one mode of tension removal, (a) is a figure showing a state which starts tension removal, and (b) shows a state which is performing removal by pulling a tab. It is a figure and (c) is a figure which shows the state which tension | pulling removal was completed. It is a schematic top view for demonstrating one aspect | mode of tension removal, Comprising: (a) is a figure which shows the state which starts tension | pulling removal, (b) shows the state which is performing the removal by pulling a tab. It is a figure and (c) is a figure which shows the state which tension | pulling removal was completed. It is sectional drawing which shows one structural example of an adhesive sheet typically. It is explanatory drawing which shows typically the measuring method of shear adhesive force. It is explanatory drawing which shows typically the measuring method of the tensile peeling stress B. FIG.

  Hereinafter, preferred embodiments of the present invention will be described. Note that matters other than the matters specifically mentioned in the present specification and necessary for the implementation of the present invention are based on the teachings on the implementation of the invention described in the present specification and the common general technical knowledge at the time of filing. Can be understood by those skilled in the art. The present invention can be carried out based on the contents disclosed in this specification and common technical knowledge in the field. Further, in the following drawings, members / parts having the same action may be described with the same reference numerals, and overlapping descriptions 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 pressure-sensitive adhesive product, pressure-sensitive adhesive sheet, and tab of the present invention actually provided as a product are not necessarily accurate. It is not a representation.

In this specification, the “pressure-sensitive adhesive” refers to a material that exhibits a soft solid (viscoelastic body) state in a temperature range near room temperature and has a property of easily adhering to an adherend by pressure as described above. . The adhesive here is generally defined as “CA Dahlquist,“ Adhesion: Fundamental and Practice ”, McLaren & Sons, (1966) P. 143”, and generally has a complex tensile modulus E ^* (1 Hz). <10 < ⁷ > dyne / cm < ² > material (typically a material having the above properties at 25 [deg.] C.).

  Further, in this specification, the “extensible adhesive sheet” refers to an adhesive sheet having extensibility that can be grasped and stretched by an individual (standard adult). Typically, when pulled in the shearing direction while being attached to the adherend, the adhesion area with the adherend decreases due to the extension of the adhesive sheet, and finally peels off from the adherend. It may be a pressure-sensitive adhesive sheet having a possible degree of extensibility. Preferably, it can be an adhesive sheet exhibiting elongation at break, which will be described later. In the present specification, the “extensible adhesive sheet” may be simply abbreviated as “adhesive sheet”.

  Further, in this specification, the “band shape” means 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 linearly extending direction and a width shorter than the length, and includes a rectangular shape and a strip shape. Therefore, the belt shape can be rephrased as a long shape. The band shape according to one aspect has a shape extending in a straight line, but may have a shape extending in a curved line, and may include one having a part extending in a straight line and a part extending in a curved line. . The width of the band shape may not be constant.

  Further, in this specification, “tab” is used as a word meaning “knob” that becomes a starting point (starting point of pulling) 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 grasped by a finger and has a shape that can be grasped by a finger (for example, a flat rectangular shape), 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 grasped by a finger, and there is no restriction on the shape. For example, a tab having a perforation can have a small size because it can be pulled through a hook through the perforation. A typical tab has a planar shape continuous from the pressure-sensitive adhesive sheet, and it is preferable that the tab does not expand by pulling or is less extensible than the pressure-sensitive adhesive sheet even if extended.

<Adhesive products with tabs>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. A tabbed adhesive product 401 shown in FIG. 1 includes an extensible adhesive sheet 410 and a tab 450. The adhesive sheet 410 has two adhesive sheet pieces 430 a and 430 b as portions extending from the tab 450.

  The pressure-sensitive adhesive sheet 410 is sandwiched between the objects (adhered bodies) A1 and A2, and is adhered to the objects A1 and A2. Specifically, the pressure-sensitive adhesive sheet 410 of this embodiment is double-sided adhesive, and each pressure-sensitive adhesive surface is bonded to the objects A1 and A2. 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 bonded to the objects A1 and A2.

  Each of the adhesive sheet pieces 430a and 430b has a strip shape extending linearly. The adhesive sheet pieces 430a and 430b are fixed to a tab 450 at one end in the longitudinal direction. The pressure-sensitive adhesive sheet pieces 430a and 430b are arranged separately at a predetermined interval. Specifically, the adhesive sheet pieces 430a and 430b are parallel to each other. With this arrangement, the pressure-sensitive adhesive sheet pieces 430a and 430b are bonded along the inner side of the long side of the surface of the object A1 on the surface (attachment surface) of the object A1 having a rectangular shape and exhibit a good bonding function. Further, the adhesive sheet pieces 430a and 430b extend from the tab 450 in the same direction (left direction of the tab 450 in FIG. 1), and when the tab 450 is pulled in a predetermined direction (right direction in FIG. 1), Each of the pressure-sensitive 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 bonding 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 extend in the longitudinal direction. To peel 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, respectively. The tab 450 of this embodiment is a non-extensible resin film, and its surface is non-adhesive. The tab 450 is fixed to the pressure-sensitive adhesive sheet pieces 430a and 430b by sticking to the pressure-sensitive adhesive surfaces (both sides) at the ends of the pressure-sensitive adhesive sheet pieces 430a and 430b.

  A tabbed adhesive product 402 shown in FIG. 2 is a modification of the above embodiment. This tabbed adhesive product 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 tabbed pressure-sensitive adhesive product 402 is used for joining the base material S and the member M1, and is based on the base material S and the member M1. It adheres to the material S and the member M1. Moreover, the adhesive sheet piece 430b which comprises the adhesive sheet 410 is used for joining the base material S and the member M2, and adheres to the base material S and the member M2 between the base material S and the member M2. Yes. 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.

  The tab 450 includes adhesive sheet piece fixing portions 452a and 452b that are connected in a separable state. Specifically, the tab 450 having a rectangular shape has a separation line 454 substantially on the middle line in the longitudinal direction. Here, the intermediate line means a line orthogonal to the longitudinal direction located in the middle of the longitudinal direction of the tab 450. The tab 450 is located at one side of the separation line 454 (upward in FIG. 2) and the other side of the separation line 454 (downward in FIG. 2) with the separation line 454 as a boundary. And an adhesive sheet piece fixing part 452b. The adhesive sheet piece fixing portions 452a and 452b are both continuous (connected) as a tab 450, but can be separated by a separation line 454. In this embodiment, the adhesive sheet piece fixing portions 452a and 452b are detachably connected by making a perforation in the separation line 454. With the above configuration, for example, when it is desired to maintain the bonding between the base material S and the member M1 but to cancel the bonding between the base material S and the member M2, the adhesive sheet piece fixing portions 452a and 452b are connected to the separation line 454. By separating them and pulling only the adhesive sheet piece fixing part 452b, it is possible to release only the bonding between the base material S and the member M2.

  When the pressure-sensitive adhesive sheet pieces 430a and 430b constituting the pressure-sensitive adhesive sheet 410 have a band shape (typically 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 of a predetermined value or more, the width can be set to 10 mm or less (for example, 5 mm or less, further 3 mm or less). In addition, from the viewpoint of preventing damage such as tearing at the time of tensile removal, the width of each of the pressure-sensitive 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. More preferably (for example, 12 mm or more). In addition, the width | variety of a some adhesive sheet piece may be the same, and may differ.

  When the pressure-sensitive adhesive sheet pieces 430a and 430b have a band shape (typically rectangular shape), the length is not particularly limited. For example, from the viewpoint of removal workability by pulling, the length is 1 cm or more (for example, 3 cm or more, typical Is preferably 5 cm or more. 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, more preferably 5 cm or less). In addition, the length of a some adhesive sheet piece may be the same, and may differ.

  When the tab 450 has a rectangular shape as in the above-described embodiment, the length is not particularly limited, and is suitably about 10 mm or more. Depending on the width and number of the pressure-sensitive adhesive sheet pieces, 15 mm or more ( For example, 20 mm or more, typically 30 mm or more). 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 embodiment, the pressure-sensitive adhesive sheet constituting the tabbed pressure-sensitive adhesive product has double-sided adhesive properties and is composed of a plurality of pressure-sensitive adhesive sheet pieces having 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 not be composed of separated pressure-sensitive adhesive sheet pieces, and may have two or more parts (parts extending from the tab) of the pressure-sensitive adhesive sheet having a continuous structure. In this case, the part extended from the said tab can exhibit the function similar to an 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 a shape extending in a curved shape, or a shape having a straight line and a curved line (e.g. Shape, a U-shape, an arc shape, a wave shape, a zigzag shape, or the like). The plurality of pressure-sensitive adhesive sheet pieces may have the same shape or different shapes.

  Moreover, in the said embodiment, although two adhesive sheet pieces were used, it is not limited to this. The number of the adhesive sheet pieces may be 2 or more (for example, 3 or more). Therefore, the number of members to which the adhesive sheet pieces are attached can also be 3 or more.

  Moreover, in the said embodiment, although two adhesive sheet pieces (a part of adhesive sheet) had the strip | belt shape extended in a straight line, respectively, and were arrange | positioned mutually parallel, the adhesive sheet piece in the technique disclosed here The arrangement of (a part of the pressure-sensitive adhesive sheet) is not limited to the arrangement of the above embodiment. The plurality of pressure-sensitive adhesive sheet pieces (a part of the pressure-sensitive adhesive sheet) can be arranged in various ways as long as they can be removed 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 crossing angle (subordinate angle) of the plurality of pressure-sensitive adhesive sheet pieces can be set in a range of approximately 0 ° (that is, parallel) to 180 °. The arrangement according to one aspect is an arrangement in which a plurality of adhesive sheet pieces extend radially from the tab. As another aspect, there is an arrangement in which a plurality of adhesive sheet pieces extend in the same direction from the tab. The above-mentioned same direction typically indicates that a plurality of pressure-sensitive adhesive sheet pieces are substantially parallel, but the other pressure-sensitive adhesive sheet piece is 0 ° to less than 90 ° (preferably based on one pressure-sensitive adhesive sheet piece). Includes extending at an angle within a range of 0 ° to 45 °, and further 0 ° to 30 °.

  Moreover, in the said embodiment, although the tab was a rectangular resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the pressure-sensitive adhesive sheet non-adhesive or low-adhesive. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet piece which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the adhesive sheet piece having a band shape. Further, the crossing angle (recess angle) between the tab and the pressure-sensitive adhesive sheet piece (a part of the pressure-sensitive adhesive sheet) was almost 90 ° in the above embodiment, but is not particularly limited thereto, and the crossing angle is The range may be approximately 30 to 150 ° (for example, 45 to 135 °, and further 60 to 120 °).

  Moreover, in the said modification, the tab had the some adhesive sheet piece fixing | fixed part connected so that separation | separation with the separation line was possible, but there may not be an adhesive sheet piece fixing | fixed part and a separation line. Moreover, when it has an adhesive sheet piece fixing | fixed part and a separating line, those structures are not limited to the structure of the said embodiment. By adopting a conventionally known technique as appropriate, adjacent adhesive sheet piece fixing portions can be connected in a separable state. The position of the separation line may not be in the middle of the longitudinal direction of the tab, and an appropriate position can be selected according to the location and number of the adhesive sheet piece fixing portions. Moreover, the adhesive sheet piece fixing | fixed part may be 2 or more (for example, 3 or more).

<Adhesive product with tab (Reference embodiment 1)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. A tabbed adhesive product 1 shown in FIG. 3 includes an extensible adhesive sheet 10 and a tab 50 provided at an end of the adhesive sheet 10. Moreover, the adhesive sheet 10 has the affixing part 12 affixed on object (adhered body) A1 and A2, and the non-affixing part 14 located between the affixing part 12 and the tab 50. FIG. In this embodiment, in the adhesive product 1 with a tab, the pasting part 12, the non-pasting part 14, and the tab 50 have an arrangement relationship that is continuous in this order.

  The pressure-sensitive adhesive sheet 10 has a strip shape extending linearly. The affixing portion 12 of the adhesive sheet 10 is 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 has double-sided adhesiveness, and each pressure-sensitive adhesive surface in the pasting portion 12 is bonded to the objects A1 and A2. On the other hand, the non-pasting part 14 protrudes outside between the objects A1 and A2, and is not bonded to the object A1. Therefore, the non-pasting part 14 and the tab 50 arranged at the tip are exposed to the outside of the objects A1 and A2. In this embodiment, the pasting part 12 and the non-pasting part 14 are divided by a straight line corresponding to the outline of the object A1 (a straight line perpendicular to the longitudinal direction of the adhesive sheet 10).

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

  Here, the technical advantage which provides the non-sticking part 14 in the adhesive product 1 with a tab is demonstrated with reference to FIG. The pressure-sensitive adhesive sheet 10 of the tabbed pressure-sensitive adhesive product 1 shown in FIG. 3 is a double-sided adhesive pressure-sensitive adhesive sheet 10 as described above, and the pressure-sensitive adhesive surfaces of the pasting part 12 are bonded to the objects A1 and A2, respectively. When the tab 50 fixed to one end of the pressure-sensitive adhesive sheet 10 is pulled in a state where the pasting portion 12 is bonded to the objects A1 and A2, the position between the tab 50 and the pasting portion 12 is as shown in FIG. The non-pasting part 14 to be stretched has priority over the pasting part 12. This is mainly based on the low resistance due to non-adhesion of the non-sticking portion 14 and the positional relationship. As can be understood from FIG. 4, the adhesion area of the adhesive sheet 10 to the objects A <b> 1 and A <b> 2 decreases due to the extension of the non-sticking part 14. Usually, peeling of the affixing portion 12 (typically peeling by pulling) requires a great amount of force particularly in the initial stage when the adhesive sheet 10 starts to stretch, because the adhesion state with the objects A1 and A2 becomes resistance. On the other hand, by providing the non-sticking part 14, the adhesive sheet 10 starts to peel from the objects A and A2 with a relatively small force for extending the non-sticking part 14. Thereby, the subsequent peeling in the shearing direction can proceed smoothly.

  Moreover, positioning of the tab 50 is mentioned as another advantage which provides the non-sticking part 14. FIG. Specifically, after bonding the two objects A1 and A2 with the pressure-sensitive adhesive sheet 10, the pressure-sensitive adhesive surface of the non-sticking portion 14 is brought into contact with the outer surface of the object A1. Thereby, the non-pasting part 14 is temporarily fixed to the outer surface (typically a side surface etc.) of the adherend, and the tab 50 continuous with the non-pasting 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 exhibited 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 part 14 of the adhesive product 1 with a tab is made longer than the height of the side surface of the object A1, and the top surface of the object A1 (the surface on the opposite side to the face on which the sticking part 12 of the adhesive sheet 10 is pasted). Design to be reachable. In this configuration, when the adhesive surface of the non-adhering portion 14 is brought into contact with the outer surface of the object A1 and temporarily fixed, the tab 50 is also disposed along the upper surface of the object A1 and does not get in the way.

  The area ratio of the non-sticking part 14 in the pressure-sensitive adhesive sheet 10 is suitably 50% or less from the viewpoint of sufficiently securing the area of the sticking part 12, and preferably 30% or less (for example, 20% or less, typically 10% or less). Therefore, the area ratio of the pasting portion 12 is appropriately 50% or more, and preferably 70% or more (for example, 80% or more, typically 90% or more). Further, from the viewpoint of preferably expressing the action of the non-sticking part 14, the area ratio of the non-sticking part 14 is suitably 1% or more, and may be approximately 3% or more (for example, 5% or more). By setting the area ratio of the non-sticking part 14 to a predetermined value or more, the tab 50 continuously exposed to the non-sticking part 14 can be easily placed along the adherend. In that case, the area ratio of the pasting portion 12 is suitably 99% or less, and may be approximately 97% or less (for example, 95% or less).

  The ratio of the length L to the width W of the pressure-sensitive adhesive sheet 10 (L / W) is preferably 1 or more. The pressure-sensitive adhesive sheet 10 having such a shape can exhibit a good adhesion function to a rectangular adherend (for example, a battery). Moreover, it is more preferable that the adhesive sheet 10 has a strip shape (typically a rectangular shape) as in the present embodiment. In that case, although depending on the shape and size of the adherend and the location of the adherend, 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) There is a tendency to be excellent in handleability. The upper limit of the ratio (L / W) is not particularly limited, but the ratio (L / W) may be approximately 50 or less (for example, 30 or less, typically 20 or less) from the viewpoint of strength, handleability, and the like. .

  Moreover, in length L of the adhesive sheet 10 which has a strip | belt shape, ratio (L1: L2) of the length L1 of the sticking part 12 and the length L2 of the non-sticking part 14 is the securing of the adhesion area in the sticking part 12, and From the viewpoint of achieving both peelability by the non-sticking portion 14 (typically, peelability by pulling), it is appropriate that the ratio is 99: 1 to 50:50, preferably 97: 3 to 60:40. (For example, 95: 5 to 70:30, typically 90:10 to 80:20). Note that L2 is suitably about 1 mm or more, preferably 3 mm or more, more preferably 5 mm or more (for example, 10 mm or more). L2 is suitably 30 mm or less (for example, 20 mm or less).

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

  Moreover, in the said embodiment, although the sticking part and the non-sticking part were divided by the line orthogonal to the longitudinal direction of the adhesive sheet which has a strip | belt shape, it 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 (adhered body) to which the sticking part is attached. In the technique disclosed herein, the pasting portion may typically be a portion that is entirely pasted on the adherend. On the other hand, the non-sticking part is a part where at least one surface (may be both surfaces) is not attached to the adherend. The non-sticking part may be a part other than the sticking part in the pressure-sensitive adhesive sheet, for example. The sticking part and the non-sticking part can have different color schemes by including a coloring material such as a pigment from the viewpoint of alignment with respect to the adherend. Moreover, you may put a line and a mark in the boundary of both.

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

  Moreover, in the said embodiment, although the surface of the non-sticking part had adhesiveness, the technique disclosed here is not limited to this. The surface of the non-sticking part and the surface of the sticking part 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 a non-sticking part is low-tackiness means that adhesive force (typically SUS180 degree peeling strength) is low compared with the surface of a sticking part. For example, the surface of the non-sticking part can be made non-adhesive or low-tackiness by applying powder on the sticking face of the non-sticking part or covering the sticking face with a thin film such as a resin film. In the case where the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet with a base material, the surface of the non-adhered part is made non-adhesive or low-adhesive by not forming the pressure-sensitive adhesive layer or removing the formed pressure-sensitive adhesive layer. be able to. In this case, a non-sticking part can consist only of a base film without an adhesive layer.

  Moreover, in the said embodiment, although the non-pasting part was exposed from between two objects, it is not limited to this, As for a non-pasting part, two objects were joined by the affixing part. In the state, it may exist between two objects. In that case, the surface of the non-sticking part is non-adhesive. Therefore, the non-sticking part may not be exposed outside the object (adhered body).

  Moreover, in the said embodiment, although the tab was a square-shaped resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the pressure-sensitive adhesive sheet non-adhesive or low-adhesive. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the adhesive sheet having a band shape. In that case, a non-pasting part may be arrange | positioned between the tab arrange | positioned at both ends, and the affixing part.

<Adhesive product with tab (Reference embodiment 2)>
The tabbed adhesive product disclosed herein may have the structure schematically shown in FIG. A tabbed adhesive product 101 shown in FIG. 5 includes an extensible adhesive sheet 110 and a tab 150 provided at an end of the adhesive sheet 110. The pressure-sensitive adhesive sheet 110 has a pasting part 112 and an anchor part 116. The affixing part 112 is a part for joining the objects (adherents) A1 and A2. The anchor part 116 is fixed only to the object A2. The affixing portion 112 is disposed between the anchor portion 116 and the tab 150. In this embodiment, in the adhesive product 101 with a tab, the anchor part 116, the affixing part 112, and the tab 150 have a continuous arrangement relationship in this order.

  The pressure-sensitive adhesive sheet 110 has double-sided adhesiveness to join the objects A1 and A2. Moreover, the adhesive sheet 110 has a strip shape extending linearly. The sticking part 112 of the adhesive sheet 110 is in a state of being sandwiched between the objects A1 and A2, and is adhered to the objects A1 and A2. Specifically, each adhesive surface in the pasting part 112 of the adhesive sheet 110 is bonded to the objects A1 and A2. Moreover, the adhesive sheet 110 of this embodiment shows rubber elasticity at normal temperature (about 10-30 degreeC).

  An anchor 116 is present at one end of the pressure-sensitive adhesive sheet 110 in the longitudinal direction. Unlike the attaching part 112, the anchor part 116 protrudes outside between the objects A1 and A2, and is not bonded to the object A1. In other words, the anchor part 116 is exposed to the outside of the objects A1 and A2. This state is realized by the length of the adhesive sheet 110 being longer than the object A1. In this embodiment, the length L in the longitudinal direction of the 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 so 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 pasting part 112 and the anchor part 116 are separated by a straight line corresponding to the outline of the object A1 (a straight line perpendicular to the longitudinal direction of the adhesive sheet 110).

  A tab 150 is fixed to the other end in the longitudinal direction of the adhesive sheet 110 (the end opposite to the one end). The tab 150 has a substantially rectangular shape when viewed from the top. The tab 150 of this embodiment is a non-extensible resin film, and the surface thereof 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 sides) at the end of the pressure-sensitive adhesive sheet 110.

  The area ratio of the anchor part 116 in the pressure-sensitive adhesive sheet 110 is appropriately 50% or less, preferably 30% or less (for example, 20% or less, typically, from the viewpoint of sufficiently securing the area of the pasting part 112. Is 10% or less). Therefore, the area ratio of the pasting portion 112 is appropriately 50% or more, and preferably 70% or more (for example, 80% or more, typically 90% or more). Further, from the viewpoint of preferably expressing the action of the anchor part 116, the area ratio of the anchor part 116 is suitably 1% or more, and may be approximately 3% or more (for example, 5% or more). In that case, the area ratio of the pasting part 112 is suitably 99% or less, and may be approximately 97% or less (for example, 95% or less).

  The ratio of the length L to the width W of the adhesive sheet 110 (L / W) 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). Moreover, it is more preferable that the adhesive sheet 110 has a belt shape (typically a rectangular shape) as in the present embodiment. In that case, although depending on the shape and size of the adherend and the location of the adherend, 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) There is a tendency to be excellent in handleability. The upper limit of the ratio (L / W) is not particularly limited, but the ratio (L / W) may be approximately 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) between the length L1 of the affixing portion 112 and the length L3 of the anchor portion 116 is determined by securing the adhesion area in the affixing portion 112 and anchoring. From the viewpoint of achieving both the removal workability by the section 116, it is appropriate that the ratio is 99: 1 to 50:50, preferably 97: 3 to 60:40 (for example, 95: 5 to 70:30, typically Is 90: 10-80: 20). Note that 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). L2 is suitably 30 mm or less (for example, 20 mm or less).

  In addition, in the said embodiment, although the adhesive sheet which comprises the adhesive product with a tab had a strip | belt shape, the shape of the adhesive sheet disclosed here is not limited to this. The pressure-sensitive adhesive sheet may be, for example, a square shape or may have a belt-like portion in part. The pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above embodiment, but is not limited thereto, and a shape extending in a curved shape or a shape having a straight line and a curved line (for example, a dogleg shape). Or a U-shape, arc shape, wave shape, zigzag shape, or the like).

  Moreover, in the said embodiment, although the adhesive sheet showed rubber elasticity at normal temperature (about 10-30 degreeC) as a whole, the material and structure of an 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 addition, when the pressure-sensitive adhesive sheet has a property of stretching due to elastic deformation, defects due to elastic repulsion (damage of the adherend, collision of the adherend with an operator, etc.) tend to be remarkable, but they are disclosed here. The above-mentioned problem can be solved by applying the technology (installation of the anchor part). Therefore, the improvement effect of removal workability | operativity can be exhibited especially preferable by applying the technique disclosed here with respect to the adhesive product with a tab provided with the adhesive sheet which has the said rubber elasticity.

  Moreover, in the said embodiment, although the affixing part and the anchor part were divided by the line orthogonal to the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The classification of the adhesive sheet attaching part and the anchor part may be determined according to the shape of the object (adhered body) to which the attaching part is attached. In the technique disclosed herein, the pasting portion may typically be a portion that is entirely pasted on the adherend. On the other hand, the anchor portion is a portion where at least one surface (may be both surfaces) is not attached to the adherend, and typically one of the two objects (adherend). It may be a part that protrudes. An anchor part can also be parts other than a pasting part in an adhesive sheet, for example. The sticking part and the anchor part can have different color schemes by including a coloring material such as a pigment from the viewpoint of alignment with respect to the adherend. Moreover, you may put a line and a mark in the boundary of both.

  Moreover, an anchor part is a part fixed to one object among the two objects joined by a sticking part, as demonstrated in the said embodiment. The fixing to the object is performed by sticking the anchor portion of the adhesive sheet to the object. Since the pasting basically involves an intentional action (typically pressure bonding), a temporarily fixed (temporarily fixed) state in which no pressure is applied is not considered to be pasted.

  Moreover, in the said embodiment, although the anchor part had adhesiveness on both surfaces, the technique disclosed here is not limited to this. The surface of the anchor part and the surface of the affixing part may be made of the same material (typically, an adhesive having the same composition) or may be made of different materials. One surface of the anchor portion (exposed surface; the surface opposite to the surface attached to one object) may be non-adhesive or low adhesive. In addition, that the surface of an anchor part is low adhesiveness means that adhesive force (typically SUS180 degree peeling strength) is low compared with the surface of a sticking part. 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 the case where the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet with a base material, the pressure-sensitive adhesive layer is not formed on one side or the formed pressure-sensitive adhesive layer is removed to make one side of the anchor portion non-adhesive or low-tacky. can do. In this case, the anchor portion can be configured as a single-sided adhesive sheet that does not have a pressure-sensitive adhesive layer on one side.

  Moreover, in the said embodiment, although the anchor part was exposed from between two objects, it is not limited to this, An anchor part is in the state in which two objects were joined by the sticking part. It may exist between two objects. In that case, one side of the anchor portion is non-adhesive. Therefore, the anchor portion may not be exposed outside the object (adhered body).

  Moreover, in the said embodiment, although the tab was a square-shaped resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the pressure-sensitive adhesive sheet non-adhesive or low-adhesive. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the adhesive sheet having a band shape. In that case, an anchor part may be arrange | positioned between the tab arrange | positioned at both ends, and the affixing part.

<Adhesive product with tab (Reference embodiment 3)>
The tabbed adhesive product disclosed herein may have a structure schematically shown in FIG. FIG. 6 shows two tabbed adhesive products 201A and 201B for fixing the objects (adhered bodies) A1 and A2. A tabbed adhesive product 201 </ b> A disposed above in FIG. 6 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 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 is double-sided adhesive, and each pressure-sensitive adhesive surface is bonded to the objects A1 and A2.

  The band shape of the pressure-sensitive adhesive sheet 210 has a bent portion 220. In other words, the adhesive sheet 210 has a band shape when viewed from the surface of the object A2 to which the adhesive sheet 210 is attached, and the band has a bent portion 220. In the pressure-sensitive adhesive sheet 210, three bent portions 220 are provided, and the pressure-sensitive adhesive sheet 210 extends linearly except for the bent portion 220. Further, two portions of the bent portion 220 correspond to two corners constituting the outer periphery of the surface (attachment surface) of the object A1 having a rectangular shape. Thereby, the adhesive sheet 210 has a shape partially along the outer periphery of the surface of the object A1. Specifically, the pressure-sensitive adhesive sheet 210 has a U-shape toward the pasting surface.

  Further, in the adhesive sheet 210, each bent portion 220 is bent in a curvilinear shape (so as to draw an arc). In this embodiment, each bent portion 220 is bent in an arc shape (R shape) at a substantially right angle. By making the bent part 220 curved, when pulling the adhesive sheet 210, it is difficult to cause problems such as tearing from the bent part 220 as a starting point.

  Moreover, the adhesive sheet 210 has a free end at one end (an end opposite to the end on the side where the tab 250 is provided). Specifically, one end of the U shape in the adhesive sheet 210 is a free end. A structure in which the adhesive sheet 210 of the tabbed adhesive product 201A and the adhesive sheet 210 of the tabbed adhesive product 201B are continuous by providing one end of the adhesive sheet 210 as a free end (tabs are provided at both ends of the U-shaped adhesive sheet) There is a tendency that the peelability of the pressure-sensitive adhesive sheet (typically, the peelability by pulling) is improved as compared with the pressure-sensitive adhesive product having the structure described above.

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

  In the adhesive product 201B with a tab arranged below in FIG. 6, the sticking position to the object A1 is different, and the U shape of the adhesive sheet 210 is opposite to the U shape of the adhesive sheet 210 of the adhesive product 201A with tab. It has basically the same configuration as that of the tabbed adhesive product 201A except that it is convex in the direction. Therefore, the overlapping description is omitted.

  A tabbed adhesive product 202 shown in FIG. 7 is a modification of the above embodiment. The pressure-sensitive adhesive sheet 210 of the tabbed pressure-sensitive adhesive product 202 has three bent portions 220, and each bent portion 220 has three corners that form the outer periphery of the surface (attachment surface) of the object A1 having a rectangular shape. It corresponds. Accordingly, the pressure-sensitive adhesive sheet 210 has a shape along all sides (four sides) of the outer periphery of the surface of the object A1 having a rectangular shape. The pressure-sensitive adhesive sheet 210 makes one round inside the outer periphery of the surface of the object A1 having a rectangular shape, but is not connected to the original pressure-sensitive adhesive sheet 210, and one end (terminal) thereof is a free end. That is, the pressure-sensitive adhesive sheet 210 that makes a round along the outer periphery of the surface of the object A1 has a non-annular form. The other items are basically the same as the configuration shown in FIG.

  A tabbed adhesive product 203 shown in FIG. 8 is also a modification of the above embodiment. The pressure-sensitive adhesive sheet 210 of the tabbed pressure-sensitive adhesive product 203 has a band shape extending in a curved shape. Specifically, the adhesive sheet 210 has a wave shape. By comprising in this way, the adhesive sheet 210 can cover the adherend (object) surface (adhesion surface) extensively with a small adhesion area. The other items are basically the same as the configuration shown in FIG.

  In addition, although the adhesive sheet which comprises the adhesive product with a tab has a strip | belt shape, this strip | belt shape is not limited to the shape of the said embodiment. For example, it can take a shape such as a U-shape, a U-shape, an arc shape, or a wave shape. 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.

  Moreover, in the said embodiment, although the bending part of the adhesive sheet was a part bent in the curve shape, the technique disclosed here 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 °. When the bent portion is bent at an angle of approximately 180 °, the bent portion can typically have a shape (U-shape) that is folded back into a curved shape. Moreover, the number of the bending parts in an adhesive sheet should just be 1 or more, and 2 or more (for example, 3 or more) may be sufficient as it.

  Moreover, in the said embodiment, although the tab was a square-shaped resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the pressure-sensitive adhesive sheet non-adhesive or low-adhesive. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the 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. A tabbed adhesive product 301 shown in FIG. 9 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 strip shape. The pressure-sensitive adhesive sheet 310 has a portion whose width increases linearly as the distance from the tab 350 starts from the tab 350 in the longitudinal direction. Then, the adhesive sheet 310 tapers as it moves further away from the tab 350 after reaching the maximum width at a substantially middle point in the longitudinal direction of the adhesive sheet 310. More specifically, both sides (long sides) 310a and 310b in the longitudinal direction of the pressure-sensitive adhesive sheet 310 spread in the width direction as the distance from the tab 350 increases, and the pressure-sensitive adhesive sheet 310 reaches the maximum width. Thereafter, the side sides 310a and 310b taper and reach one end in the longitudinal direction of the pressure-sensitive adhesive sheet 310 (an end opposite to the end portion on the side where 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. Accordingly, the tabbed adhesive product 301 has a relatively wide adhesion area with respect to the objects (adhered bodies) A1 and A2 as compared with the width of the tab 350. Here, the “tab width” means the length (maximum length) in the 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 is double-sided adhesive, and each pressure-sensitive adhesive surface is bonded to the objects A1 and A2.

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

  A tabbed adhesive product 302 shown in FIG. 10 is a modification of the above embodiment. The pressure-sensitive adhesive sheet 310 of the pressure-sensitive adhesive product 302 with a tab extends in a curved shape so that only the one side (one side) 310a in the longitudinal direction moves away from the tab 350 so that the width of the pressure-sensitive adhesive sheet 310 increases. 310 has reached its maximum width. Thereafter, the one side 310a extends in a curved shape so as to narrow the width of the pressure-sensitive adhesive sheet 310, and is one end in the longitudinal direction of the pressure-sensitive adhesive sheet 310 (an end opposite to the end on the side where the tab 350 is provided. Has reached the end). In short, the one side 310a of the pressure-sensitive adhesive sheet 310 has an arcuate curve. On the other hand, the other side 310b in the longitudinal direction of the pressure-sensitive adhesive sheet 310 extends in a straight line and is along one side of the rectangular object A1. The other items are basically the same as the configuration shown in FIG.

  Although not particularly illustrated, another modified example of the above embodiment includes a tabbed adhesive product having a configuration in which both sides (both sides) in the longitudinal direction of the adhesive sheet are curved. Specifically, the adhesive sheet of the adhesive product with tabs reaches the maximum width by extending in a curved shape such that the width of the adhesive sheet increases as both sides in the longitudinal direction (both sides) move away from the tab. Yes. Thereafter, the both sides extend in a curved line so as to narrow the width of the pressure-sensitive adhesive sheet, and reach one end in the longitudinal direction of the pressure-sensitive adhesive sheet (the end opposite to the end portion on which the tab is provided, the free end). ing. In short, the both sides of the pressure-sensitive adhesive sheet have an arcuate curve. The other items are basically the same as the configuration shown in FIG.

  Furthermore, although not specifically illustrated, as another modification of the above-described 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. Adhesive products with tabs. Specifically, the adhesive sheet of the adhesive product with tabs reaches the maximum width by extending in a straight line so that only one side (one side) in the longitudinal direction increases away from the tab. doing. Thereafter, the one side is tapered so as to narrow 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 portion on the side where the tab is provided, a free end). Yes. To put it simply, the one side of the pressure-sensitive adhesive sheet is drawn in a U-shaped bending line. On the other hand, the other side in the longitudinal direction of the pressure-sensitive adhesive sheet extends in a straight line and is along one side of the rectangular object. The other items are basically the same as the configuration shown in FIG.

  In the tabbed adhesive products 301 and 302, although not particularly illustrated, 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 can be formed by providing a perforation in the tab 350. By providing a perforation in the approximate 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.

  From the viewpoint of space saving, the width of the tab 350 is suitably about 90% or less of the width of the pressure-sensitive adhesive sheet 310, preferably 80% or less (for example, 70% or less, Has a width of 60% or less. Further, from the viewpoint of the removable property of the pressure-sensitive adhesive sheet, it is appropriate that the tab 350 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 from the viewpoint of the removal property of the pressure-sensitive adhesive sheet, the length of the tab 350 may be approximately 50% or more. It is suitable and preferably has a length of 70% or more (eg, 90% or more) of the width of the tab 350. From the viewpoint of space saving, the length of the tab 350 is suitably about 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. Have a length of

  In addition, although the adhesive sheet which comprises the adhesive product with a tab has a strip | belt shape, this strip | belt shape is not limited to the shape of the said embodiment. For example, the band shape of the pressure-sensitive adhesive sheet may take a shape such as a U-shape, a U-shape, an arc shape, or a wave shape. The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Moreover, in the said embodiment, although the width | variety changed a width | variety as it distanced from a tab, it is not limited to this, You may have a fixed width | variety. Moreover, about what the width | variety of an adhesive sheet changes as it leaves | separates from a tab, you may have a fixed width | variety, for example, after a width | variety becomes large and it reaches the maximum width. Alternatively, the pressure-sensitive adhesive sheet may have a certain width for a while and then increase in width as the distance from the tab increases. Furthermore, in the said embodiment, although the adhesive sheet had the part which tapers as it leaves | separates from a tab, the part to taper does not need to be.

  Moreover, in the said embodiment, although the tab was a square-shaped resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Alternatively, the pressure-sensitive adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the pressure-sensitive adhesive sheet non-adhesive or low-adhesive. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the 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. A tabbed adhesive product 501 shown in FIG. 11 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 its first surface 510A is bonded to an object (adhered body) A, and the second surface 510B is bonded to another object (not shown), and the space between the two objects. The two objects are joined while being sandwiched between the two. The adhesive sheet 510 has a strip shape extending linearly when viewed from above.

  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 laminated 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, but may be in contact with each other.

  The first tab film 560 and the second tab film 562 have a substantially rectangular 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 shape. Therefore, the tab 550 in a form in which they are overlapped has a substantially rectangular shape as well. The first tab film 560 and the second tab film 562 of this embodiment are non-extensible resin films, and their outer surfaces (surfaces on the side opposite to the surface attached to the adhesive sheet 510) are non-adhesive. It is sex.

  Since both the first surface 510A and the second surface 510B of the adhesive sheet 510 have adhesiveness, the first tab film 560 and the second tab film 562 are attached to the first surface 510A and the second surface 510B of the adhesive sheet 510, respectively. By being attached, it is fixed to the adhesive sheet 510. In addition, you may fix an adhesive sheet and the 1st and / or 2nd tab film using a well-known double-sided adhesive tape and an adhesive agent.

  When the pressure-sensitive adhesive sheet 510 is viewed from the upper surface (when viewed from 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 pressure-sensitive adhesive sheet 510 (typically, the edge located at one end of the pressure-sensitive adhesive sheet 510 and its both sides). Therefore, the end surface and the side surface of the pressure-sensitive adhesive sheet 510 in the end region (predetermined region including one end) where the first tab film 560 and the second tab film 562 are attached are not covered with the tab 550, and the pressure-sensitive adhesive sheet It is exposed from the side of 510. The shape of the tab 550 in this embodiment is a shape that substantially coincides with the outer periphery (outer edge) of the adhesive sheet 510 at and near the end of the adhesive sheet 510.

  From the viewpoint of limiting the protrusion of the tab 550 to the outside of the pressure-sensitive adhesive sheet 510, the ratio of the adhesion area with the pressure-sensitive adhesive sheet 510 on the pressure-sensitive adhesive sheet application surface (one surface) of the first tab film 560 is obtained. It is suitable to be 90% or more, preferably 95% or more (for example, 95% to 100%, typically 99% to 100%). For the same reason, the ratio of the adhesive area with the adhesive sheet 510 on the adhesive sheet attachment surface (one side) of the second tab film 562 is suitably 90% or more, preferably 95% or more (for example, 95). % To 100%, typically 99% to 100%).

  The thicknesses of the first tab film 560 and the second tab film 562 are not limited to a specific range because they can be set according to the purpose and the like, but are usually about 1 μm to 1 mm. The thickness is preferably 2 μm to 500 μm (for example, 5 μm to 300 μm, typically 10 μm to 100 μm). According to the technique disclosed herein, the thickness of the tab is such that the thickness of at least one (typically both) of the first and second tab films is 30 μm or more (for example, 50 μm or more, or even 70 μm or more). Even in a large configuration, it is possible to achieve excellent adhesion (adhesion between the pressure-sensitive adhesive sheet and the tab). Such a thick tab tends to have excellent gripping properties and excellent workability for removing an adhesive product. From the viewpoint of space saving, 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). It is preferable. The thicknesses of the first tab film 560 and the second tab film 562 may be the same or different.

  A tabbed adhesive product 502 shown in FIG. 12 is a modification of the above embodiment. In the tabbed adhesive product 502, the first tab film 560 disposed on the first surface 510A of the adhesive sheet 510 is smaller than the second tab film 562 disposed on the second surface 510B of the adhesive sheet 510. In other words, the area per one side of the first tab film 560 is smaller than the area per one side of the second tab film 562. The first tab film 560 and the second tab film 562 have different shapes (specifically, different quadrangular shapes). Specifically, the first tab film 560 and the second tab film 562 having a quadrangular shape have the same width as the width of the band-shaped adhesive sheet 510. Moreover, as for the 1st tab film 560 and the 2nd tab film 562, each one side (a part of outer edge) is along the edge (outer edge) of the end of the strip | belt-shaped adhesive sheet 510. As shown in FIG. However, the length of the first tab film 560 in the longitudinal direction of the adhesive sheet 510 (specifically, the length of one side of the square shape) 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 pressure-sensitive adhesive sheet 510 to which the first tab film 560 is fixed has a longitudinal direction of the pressure-sensitive adhesive sheet 510. The 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 exists. The exposed portion 518 is located between the affixing portion 512 that is affixed to the adherend A, and between the affixing portion 512 and the first tab film 560, and protrudes from the affixing surface of the adherend A. In a state where the tabbed adhesive product 502 is attached to the adherend A, the exposed portion 518 is temporarily fixed to the outer surface (side surface, upper surface, etc.) of the adherend A, so that the tab 550 is attached to the adherend A. It is arranged along the outer surface and does not get in the way. Further, in the above configuration, the first tab film 560 forms a step (clogging step) with respect to the exposed portion 518, so that the tab 550 can be easily held. Note that there is no exposed portion on the second surface 510B of the adhesive sheet 510. The other items are basically the same as the configuration shown in FIG.

In the configuration as shown in FIG. 12, 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 the range. From the viewpoint of sufficiently obtaining the effect of providing the exposed portion 518, L _T1 / L _T2 is preferably about 2/3 or less (for example, about 1/2 or less). Further, from the viewpoint of sufficiently exerting the function of the first tab film 560, it is preferable that L _T1 / L _T2 is about 1/4 or more (for example, about 1/3 or more).

A tabbed adhesive product 503 shown in FIG. 13 is also a modification of the above embodiment. In the 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 adhesive sheet 510 is improved, and processability such as shape processing and perforation is improved. Accordingly, the tab disclosed herein (including the first tab film and the second tab film) may be provided with perforations. Further, by the thickness T _T2 of the second tab film 562 is small, it is possible to suppress bulkiness caused by the thickness of the tab 550. Although not particularly illustrated, an adherend that adheres to the second surface 510B of the pressure-sensitive adhesive sheet 510 may be disposed on the entire lower surface of the pressure-sensitive adhesive product 503 with tabs (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. The other items are basically the same as the configuration shown in FIG.

In the configuration as shown in FIG. 13, 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 It is not limited. When the thickness T _T1 of the first tab film 560 is increased, the ratio (T _T1 / T _T2 ) exceeds 1, and should be about 1.5 or more (for example, about 2 or more, or about 3 or more). Is appropriate. The ratio (T _T1 / T _T2 ) is suitably about 10 or less (for example, about 5 or less, or about 2 or less). Further, depending on the usage pattern, the object to be adhered, etc., there may be a case where it is desired to set the thickness of the second tab film 562 to be large. In that case, the ratio (T _T1 / T _T2 ) is less than 1 and is suitably about 2/3 or less (for example, about 1/2 or less, and further about 1/3 or less). (T _T1 / T _T2 ) is suitably about 1/10 or more (for example, about 1/5 or more, or about 1/2 or more).

  In addition, in the said embodiment, although the adhesive sheet which comprises a tabbed adhesive product was a double-sided adhesive adhesive sheet which has a strip | belt shape, the shape of the adhesive sheet disclosed here is not limited to this. The pressure-sensitive adhesive sheet may be, for example, a square shape or may have a belt-like portion in part. The pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above embodiment, but is not limited thereto, and a shape extending in a curved shape or a shape having a straight line and a curved line (for example, a dogleg shape). Or a U-shape, arc shape, wave shape, zigzag shape, or the like). The pressure-sensitive adhesive sheet may be a single-sided pressure-sensitive adhesive sheet.

  Moreover, in the said embodiment, although the tab was a square-shaped resin film, it is not limited to this. The tab can be designed appropriately according to the purpose or the like within a range described later. Moreover, in the said embodiment, although the tab was being fixed to the end of the longitudinal direction of the adhesive sheet which has a strip | belt shape, it is not limited to this. The tab can be provided at any location where the adhesive sheet can be pulled. For example, the tab may be provided at both ends in the longitudinal direction of the 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, in addition to these, for example, the first tab film and the second tab film can be formed of different materials. Furthermore, the above two or more configurations can be combined.

<Characteristics of adhesive products with tabs>
When fixing a tab to an adhesive sheet by sticking the tab to the adhesive surface of the adhesive sheet in a tabbed adhesive product, the tab fixing surface of the adhesive sheet before fixing the tab (adhesion that is expected to be bonded to the tab) In terms of position, 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, still more preferably less than 1.0 μm. In this specification, the surface roughness Ra refers to the arithmetic average surface roughness Ra, and is based on a general surface roughness measuring device (for example, non-contact 3 manufactured by Veeco) according to JIS Z0237: 2000. It is a value measured for an appropriate range (preferably with a measurement range of 5 mm × 5 mm) using a three-dimensional surface shape measuring apparatus, model “Wyko NT-3300”).

  Moreover, it is preferable that the tab fixing surface of the pressure-sensitive adhesive sheet exhibits a peel strength of about 1 N / 20 mm or more (to a stainless steel plate 180 degree peel strength) 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. In 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 placed on the surface of a stainless steel plate (SUS plate). Reciprocate and crimp. After leaving this in the same environment for 30 minutes, using a tensile tester, in accordance with JIS Z 0237: 2000, at a tensile speed of 300 mm / min and a peel angle of 180 degrees, peel strength [N / 20 mm width] Measure. When the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet, a 25 μm-thick polyethylene terephthalate (PET) film is bonded to the other pressure-sensitive adhesive surface, and then the pressure-sensitive adhesive surface to be measured is bonded to a SUS plate for measurement. As a tensile tester, a universal tensile compression tester (product name “TG-1kN”, manufactured by Minebea Co., Ltd.) can be used.

  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 adhesion to the tab. The shear adhesive force 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 force is measured by the method described later.

  From the viewpoint of adhesion to the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive sheet application surface of the tab before being attached to the pressure-sensitive adhesive sheet is also preferably highly smooth. Specifically, it is preferable that the surface roughness Ra of the adhesive sheet attaching surface of the tab before being fixed to the adhesive sheet is less than 5.0 μm. The Ra is more preferably less than 3.0 μm, still more preferably less than 1.0 μm.

<Removing and removing adhesive products with tabs>
The tabbed pressure-sensitive adhesive product disclosed herein is excellent in the performance of removing it by pulling it out between the objects (drawing removal property). Here, the pull-out removal property means that an object is obtained by exposing the tab of the adhesive product from two objects fixed with the adhesive sheet of the adhesive product with tabs sandwiched, pulling the exposed tab, and pulling out the adhesive sheet. This means the ease of removal such as releasing the fixation (typically joining). Note that the 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 an aspect of tension removal (typically pull-out removal), and FIG. 14A is a diagram showing a state in which tension removal of a tabbed adhesive product is started. (B) is a figure which shows the state which is removing by pulling a tab, (c) is a figure which shows the state which the tension | pulling removal of the adhesive product with a tab was completed. FIG. 15 is a schematic top view for explaining one aspect of tension removal (typically pull-out removal). (A) to (c) are respectively shown in (a) to (c) of FIG. It is a corresponding figure.

  As shown in FIGS. 14A and 15A, a tabbed adhesive product (double-sided adhesive sheet) 600 is an adhesive sheet 610 for joining the objects A1 and A2, and the objects A1 and A2. And a tab 650 that is exposed to the outside. 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 object A1 and the object A2 for the purpose of repair, replacement, etc., the adhesive sheet 610 of the tabbed adhesive product 600 is pulled out from between the object A1 and the object A2. Specifically, the tabbed adhesive product 600 is pulled so that the tab 650 is pinched with a finger and pulled out between the objects A1 and A2. Then, the adhesive sheet 610 having extensibility starts to expand, the direction orthogonal to the tensile direction contracts, and begins to peel from the objects A1 and A2 (see FIGS. 14B and 15B). Finally, the entire adhesion region of the pressure-sensitive adhesive sheet 610 is peeled off, and the pull-out of the pressure-sensitive adhesive sheet 610 from between the objects A1 and A2 is completed (see FIG. 14C and FIG. 15C). The removal of the object A1 joined to the object A2 is also completed at the same time.

<Configuration of adhesive sheet>
The pressure-sensitive adhesive sheet constituting the tabbed pressure-sensitive adhesive product disclosed herein is, for example, a pressure-sensitive adhesive sheet with a base material in the form of having a pressure-sensitive adhesive layer on at least one surface (preferably both surfaces) of a film-like base material (support). is there. The concept of the pressure-sensitive adhesive sheet herein may include what are called pressure-sensitive adhesive tapes, pressure-sensitive adhesive labels, pressure-sensitive adhesive films and the like. The pressure-sensitive adhesive sheet disclosed herein may be in the form of a roll or a single sheet. Or the adhesive sheet of the form processed into various shapes may be sufficient.

  The pressure-sensitive adhesive sheet disclosed herein can 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 non-peelable) of the film-like substrate 720, respectively. The adhesive sheet 710 before use has a configuration in which each surface (each adhesive surface) of the adhesive layers 721 and 722 is protected by a release liner (not shown). Alternatively, the pressure-sensitive adhesive sheet disclosed herein is not particularly illustrated, but may be a baseless double-sided pressure-sensitive adhesive sheet composed of only a pressure-sensitive adhesive layer.

  Moreover, it is preferable that an adhesive sheet has a elongate part (it may be a strip | belt-shaped part and a rectangular-shaped part. The following is the same) from a tensile removability viewpoint. Thus, in the pressure-sensitive adhesive sheet attached to the adherend, the pressure-sensitive adhesive sheet can be preferably removed from the adherend by gripping and pulling one end in the longitudinal direction of the portion formed in a long shape. . The shape of the elongate portion is typically a band shape. From the viewpoint of tensile removability, 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 (which may be a band shape or a rectangular shape, the same applies hereinafter) when used, the width 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 predetermined breaking strength or more, the width can be 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 tearing 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), preferably 10 mm or more (for example, 12 mm or more). It is more preferable that

  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 removal workability by pulling. 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 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 (for example, 70 to 200 μm) in consideration of the adhesive properties and the like. When the total thickness of the pressure-sensitive adhesive sheet is set to a predetermined value or less, it can be advantageous in terms of reducing the thickness of the product, reducing the size, reducing the weight, and saving resources. In another preferred embodiment, the total thickness of the pressure-sensitive adhesive sheet may be 80 μm or more (for example, 100 μm or more, typically 130 μm or more), and is more than 150 μm (for example, more than 300 μm, typically more than 500 μm). May be. The pressure-sensitive adhesive sheet having such a total thickness can be preferably used for, for example, an application of fixing an object to be reattached after being attached to a wall surface or the like and used for a predetermined period.

<Characteristics of adhesive sheet>
The pressure-sensitive adhesive sheet disclosed herein preferably exhibits a shear adhesive strength of 0.5 MPa or more. Thereby, the adhesive sheet adheres well to the adherend. The pressure-sensitive adhesive sheet exhibiting the adhesive force exhibits a strong stress against a force for shifting the adhesive interface (that is, a shear force), and thus can be a reliable adhesive means in a usage mode exposed to the shear force. . The shear adhesive force is more preferably 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 force is not particularly limited. However, if the shear adhesive force is too high, there is a tendency that the tensile removability and the adhesive residue preventing property tend to be lowered, so that it is 5 MPa or less (for example, 3 MPa or less, typically 1. 5 MPa or less).

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

  The pressure-sensitive adhesive sheet disclosed herein preferably has an initial adhesive force A for PC (polycarbonate) of 3 N / 20 mm or more. Thereby, it is possible to preferably exhibit a sufficient adhesion function with respect to an adherend formed from various materials such as PC. Further, when the pressure-sensitive adhesive sheet having the initial adhesive strength A is used for, for example, a portable electronic device, the fixed arrangement of the adherent member can be maintained even when the portable electronic device is dropped. The initial adhesive strength 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 strength 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 tensile removability and adhesive residue prevention. preferable.

  The initial adhesive strength A can be 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 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 pressed against the surface of the PC plate by reciprocating a 2 kg roller once. To do. After leaving this in the same environment for 30 minutes, using a tensile tester, in accordance with JIS Z 0237: 2000, at a tensile speed of 300 mm / min and a peel angle of 180 degrees, peel strength [N / 20 mm width] Measure. When the pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet, a 25 μm-thick polyethylene terephthalate (PET) film is bonded to the other pressure-sensitive adhesive surface, and then the pressure-sensitive adhesive surface to be measured is pressure-bonded to a PC board for measurement. As a tensile tester, a universal tensile compression tester (product name “TG-1kN”, manufactured by Minebea Co., Ltd.) can be used.

  The pressure-sensitive adhesive sheet disclosed herein preferably has a tensile peeling stress B with respect to PC of 22 N / 20 mm or less. Thereby, when pulling the adhesive sheet in the tensile peeling direction and removing it from the adherend, the 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 set it to 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 tensile peeling stress B can be measured by the following method. A pressure-sensitive adhesive sheet is cut into a size having a width of 20 mm and a length of 120 mm 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 overlapped on the surface of two PC plates (30 mm × 100 mm × 2 mm thick), and 2 kg The roller is reciprocated once for pressure bonding. A portion of 70 mm (that is, 20 mm × 70 mm) from one end in the longitudinal direction of the measurement sample is pressure-bonded to each PC plate. After leaving this in the same environment for 30 minutes, using a tensile tester, the two PC plates were each fixed, and the peel strength [N / 20 mm width was obtained under the conditions of a tensile speed of 300 mm / min and a peel angle of 0 degree. ] Is measured. Specifically, as shown in FIG. 18, the adhesive surfaces 800 </ b> A and 800 </ b> B of the adhesive sheet measurement sample 800 are bonded to the two PC plates 811 and 812, respectively, and pressure bonded. This is pulled in the direction of the arrow in FIG. 18 (that is, the tensile peeling direction) at the above speed, and the peeling strength [N / 20 mm width] is measured. In the case of a single-sided adhesive sheet (single-sided adhesive sheet), the peel strength [N / 20 mm width] may be measured in the same manner as described above except that one adhesive surface is fixed to one PC board. As a tensile tester, a universal tensile compression tester (product name “TG-1kN”, manufactured by Minebea Co., Ltd.) 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 adhesion 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 as low as possible, but practically, the 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 exhibits a breaking strength of 10 MPa or more. Thereby, for example, in a configuration showing a predetermined or higher adhesive force, a configuration such as tearing or the like is difficult to occur when the adhesive sheet is removed. Moreover, there exists a tendency which is excellent also in workability. The breaking strength is more preferably 20 MPa or more, and further 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 said breaking strength is measured based on the measuring method of "tensile strength" as described in JISK7311: 1995. More specifically, the breaking strength can be measured using a No. 3 dumbbell-shaped test piece (width 5 mm) under the condition of 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. In the test, it is preferable to apply a powder to the adhesive surface to remove the influence of stickiness of the adhesive. In addition, although the tension direction in the said test is not specifically limited, When an adhesive sheet is elongate, it is preferable to make it correspond with 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 (for example, 10 times or more, typically 30 times or more) of the shear adhesive strength [MPa]. Thereby, when pulling and removing the adhesive sheet, damage such as tearing can be prevented more reliably.

  The pressure-sensitive adhesive sheet disclosed herein preferably exhibits an elongation at break of 300% or more. Thereby, tension | pulling and the deformation | transformation of an adhesive sheet interact, and the outstanding tension | pulling removability (especially shear removability) is implement | achieved. 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.

  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, marked line 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 above-described breaking strength. In addition, although the tension direction in the said test is not specifically limited, When an adhesive sheet is elongate, it is preferable to make it correspond with 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 exhibits a 100% modulus of less than 10 MPa. By setting the 100% modulus of the pressure-sensitive adhesive sheet to be less than a predetermined value, when the pressure-sensitive adhesive sheet is removed from the adherend by stretching and deforming, the resistance at the start of pulling tends to decrease and the tensile removability tends to be excellent. The 100% modulus is more preferably less than 5 MPa. The lower limit of the 100% modulus is not particularly limited, but it is usually suitably 0.5 MPa or more (for example, 1 MPa or more) from the viewpoint of the workability of attaching the adhesive sheet.

  The 100% modulus is measured according to the “tensile stress” measuring method described in JIS K 7311: 1995. More specifically, using a No. 3 dumbbell-shaped test piece (width 5 mm, marked line interval 20 mm), the tensile stress was 300 mm / min, and the stress [MPa when the marked line distance was increased by 100%. ] Is taken as 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 a base material type (selection of a mixing ratio of a hard component and a soft component), a molding method, and the like.

  In a preferred embodiment, it is appropriate that the pressure-sensitive adhesive sheet exhibits a tensile recovery rate exceeding 50%. The tensile recovery rate is more preferably 70% or more. The tensile recovery rate is more preferably 80% or more (for example, 90% or more, typically 93% to 100%). Thereby, damages, such as tearing at the time of adhesive sheet removal, can be prevented more highly. This point will be described. For example, when removing the pressure-sensitive adhesive sheet by pulling in the shear direction, a certain amount of time is usually required depending on the adhesion area and the like. Therefore, the removal operation may be interrupted halfway. In such a case, if the tensile recovery rate of the pressure-sensitive adhesive sheet is less than or equal to a predetermined value, the removal operation can be resumed from a state in which the mechanical properties (strength, elasticity, etc.) have decreased due to the tension before the operation is interrupted. At that time, the pressure-sensitive adhesive sheet cannot withstand the tension when the removal operation is resumed, and is easily damaged. 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, the deterioration after mechanical pulling is suppressed by the recovery after pulling, so that the damage is more severe. Can be prevented.

The tensile recovery rate is measured 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%. From the formula: Tensile recovery rate (%) = L ₀ / L ₁ × 100, where L ₁ is the length of the specific section after the adhesive sheet has been stretched 100% and released after 5 minutes. Obtain the tensile recovery rate.
More specifically, in accordance with JIS K 7311: 1995, a No. 3 dumbbell-shaped test piece (width 5 mm, marked line interval 20 mm) is stretched 100% under the condition of a tensile speed of 300 mm / min. In other words, it is pulled until the marked line interval extends 20 mm. Then, the length L ₁ (mark line interval: mm) after 5 minutes from the release of the tension is measured, and the tensile recovery rate is obtained from the formula: Tensile recovery rate (%) = L ₀ / L ₁ × 100; . In this method, L ₀ is an initial marked line interval of 20 mm. The tensile tester and others are basically the same as in the case of the elongation at break described above. In addition, the tensile direction in the said test is although it does not specifically limit, It is preferable to make it correspond with the longitudinal direction of an adhesive sheet or its elongate part. 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 base material includes a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer; the same shall apply hereinafter) is an acrylic polymer known in the field of pressure-sensitive adhesives. The base polymer includes one or more of various rubber-like polymers such as rubber polymers, polyester polymers, urethane polymers, polyether polymers, silicone polymers, polyamide polymers, and fluorine 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 pressure-sensitive adhesive layer containing a rubber-based polymer as a base polymer, and a urethane-based polymer. It is a urethane type adhesive layer which contains as a base polymer. Alternatively, a pressure-sensitive adhesive layer in which an acrylic polymer and a rubber polymer are used in combination as the 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 adhesive properties (typically adhesive strength), molecular design, stability over time, and the like. In this specification, the “base polymer” of the pressure-sensitive adhesive refers to a main component of the polymer component contained in the pressure-sensitive adhesive (typically, a component contained in excess of 50% by weight).

  As the acrylic polymer, for example, a polymer of a monomer raw material that includes alkyl (meth) acrylate as a main monomer and can further include a submonomer copolymerizable with the main monomer is preferable. Here, the main monomer means a component occupying 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 preferably used.
CH ₂ = C (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 chain alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of the number of carbon atoms may be represented as “C _1-20 ”). From the viewpoint of the storage elastic modulus of the pressure-sensitive adhesive, an alkyl (meth) acrylate in which R ² is a chain alkyl group of C _1-14 (eg, C _2-10 , typically C _4-8 ) is preferable, and R ^An alkyl acrylate in which ¹ is a hydrogen atom and R ² is a C _4-8 chain alkyl group is more preferable.

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, And eicosyl (meth) acrylate. 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 preferable from the viewpoints of adhesive properties and prevention of adhesive residue.

The blending ratio of the main monomer in all 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). Moreover, when using _C4-8 alkylacrylate as a monomer component, it is preferable that the ratio of _C4-8 alkylacrylate among the alkyl (meth) acrylate contained in this monomer component is 70 weight% or more, It is more preferably 90% by weight or more, and further preferably 95% by weight or more (typically 99 to 100% by weight). The technique 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 proportion less than BA.

  A submonomer having 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 a secondary 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 type or two or more types of functional group-containing monomers such as imide group-containing monomers and epoxy group-containing monomers 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 submonomer 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 thereof include hydroxyalkyl (meth) acrylates such as acrylates and unsaturated alcohols. Of these, hydroxyalkyl (meth) acrylate is preferable, and 2-hydroxyethyl acrylate (HEA) and 4-hydroxybutyl acrylate (4HBA) are more preferable.

  The amount of the submonomer may be appropriately selected so as to achieve a desired cohesive force, and is not particularly limited. Usually, from the viewpoint of achieving a good balance between adhesive force and cohesive force, the amount of the secondary monomer is suitably 0.5% by weight or more, preferably 1% by weight based on the total monomer components of the acrylic polymer. % Or more. Further, the amount of the submonomer is suitably 30% by weight or less, preferably 10% by weight or less (for example, 5% by weight or less) in the total monomer components. When the carboxy group-containing monomer is copolymerized with the acrylic polymer, the content of the carboxy group-containing monomer is, among all monomer components used for the synthesis of the acrylic polymer, from the viewpoint of coexistence of adhesive force and cohesive force. 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 a hydroxyl group-containing monomer is copolymerized with an acrylic polymer, the content of the hydroxyl group-containing monomer is approximately 0 out of all monomer components used for the synthesis of the acrylic polymer from the viewpoint of achieving both adhesive strength and cohesive strength. It is preferably in the range of 0.001 to 10% by weight (for example, 0.01 to 5% by weight, typically 0.02 to 2% by weight).

  The acrylic polymer disclosed here 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 other monomers can be used for the purpose of adjusting the glass transition temperature of the acrylic polymer, adjusting the adhesive performance (for example, peelability), and the like. Examples of the monomer that can improve 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. The said other monomer may be used individually by 1 type, and may be used in combination of 2 or more type. Of these, vinyl esters are preferred examples. Specific examples of vinyl esters include vinyl acetate (VAc), vinyl propionate, vinyl laurate, and the like. Of these, 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 monomer components used for the synthesis of the acrylic polymer. It is preferable.

  The copolymer composition of the acrylic polymer is such that the glass transition temperature (Tg) of the polymer is −15 ° C. or lower (typically −70 ° C. or higher and −15 ° C. or lower) from the viewpoint of impact resistance or the like. It is appropriate to be designed, and is preferably −25 ° C. or lower (for example, −60 ° C. or higher and −25 ° C. or lower), more preferably −40 ° C. or lower (for example, −60 ° C. or higher and −40 ° C. or lower).

The Tg of the acrylic polymer can be adjusted by appropriately changing the monomer composition (that is, the type and amount ratio of monomers used for the synthesis of the polymer). Here, the Tg of the acrylic polymer refers to a fox based on the Tg of the homopolymer (homopolymer) of each monomer constituting the polymer and the weight fraction (copolymerization ratio based on weight) of the monomer. The value obtained from the formula. The formula of Fox is a relational expression between Tg of a copolymer and 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 monomer i in the copolymer (copolymerization ratio on a weight basis), and Tgi is the monomer i. Represents the glass transition temperature (unit: K) of the homopolymer. As the Tg of the homopolymer, the value described in known materials is adopted.

In the technique disclosed here, 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 ℃
Methacrylic acid 228 ° C
2-hydroxyethyl acrylate -15 ° C
4-hydroxybutyl acrylate -40 ° C
For the Tg of homopolymers other than those exemplified above, the numerical values described in “Polymer Handbook” (3rd edition, John Wiley & Sons, Inc., 1989) are used. When not described in the above Polymer Handbook, values obtained by the measuring method described in JP-A-2007-51271 are used.

  The method for obtaining the acrylic polymer is not particularly limited, and various polymerization methods known as synthetic methods for acrylic polymers, such as solution polymerization, emulsion polymerization, bulk polymerization, and suspension polymerization, are appropriately employed. be able to. For example, a solution polymerization method can be preferably used. As a monomer supply method when performing solution polymerization, a batch charging method, a continuous supply (dropping) method, a divided supply (dropping) method, or the like that supplies all monomer raw materials at once can be appropriately employed. The polymerization temperature can be appropriately selected according to the type of monomer and solvent to be used, the type of polymerization initiator, and the like, for example, about 20 ° C. to 170 ° C. (typically 40 ° C. to 140 ° C.). it can. Alternatively, photopolymerization performed by irradiation with light such as UV (typically performed in the presence of a photopolymerization initiator), radiation polymerization performed by irradiation with radiation such as β-rays or γ-rays, etc. 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 such as toluene (typically aromatic hydrocarbons), acetate esters such as ethyl acetate, aliphatic or alicyclic hydrocarbons and the like 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 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 based on a combination of a peroxide and a reducing agent. Such a polymerization initiator can be used individually by 1 type or in combination of 2 or more types. The amount of the polymerization initiator used may be a normal amount, for example, about 0.005 to 1 part by weight (typically 0.01 to 1 part by weight) with respect to 100 parts by weight of all monomer components. You can choose from a range.

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

(Rubber polymer)
In another preferred embodiment, the pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive. Further, the rubber-based pressure-sensitive adhesive according to one preferred embodiment contains a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound as a base polymer. The monovinyl substituted aromatic compound refers to a compound in which one functional group having a vinyl group is bonded to an aromatic ring. A typical example of the aromatic ring is a benzene ring (which may be a benzene ring substituted with a functional group having no vinyl group (for example, an alkyl group)). Specific examples of the monovinyl-substituted aromatic compound include styrene, α-methylstyrene, vinyl toluene, vinyl xylene and the like. Specific examples of the conjugated diene compound include 1,3-butadiene and isoprene. Such a block copolymer can be used for a base polymer individually by 1 type or in combination of 2 or more types.

  The A segment (hard segment) in the block copolymer has a copolymerization ratio of the monovinyl-substituted aromatic compound (two or more can be used in combination) of 70% by weight or more (more preferably 90% by weight or more). It 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 can be used in combination) of 70% by weight or more (more preferably 90% by weight or more). It 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 body, a triblock body, a radial body, 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 end of the polymer chain. This is because the A segments arranged at the ends of the polymer chains are likely to gather to form a domain, thereby forming a pseudo cross-linked structure and improving the cohesiveness of the pressure-sensitive adhesive. As the block copolymer in the technique disclosed herein, for example, a diblock ratio is 30% by weight or more (more preferably 40% by weight) from the viewpoint of adhesive strength (peeling strength) to the adherend and repulsion resistance. 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. From the viewpoint of resistance to continuously applied stress, a diblock body 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 implemented in an embodiment in which the base polymer contains at least one of a styrene isoprene block copolymer and a styrene butadiene block copolymer. Among the styrene block copolymers contained in the pressure-sensitive adhesive, the proportion of styrene isoprene block copolymer is 70% by weight or more, the proportion of styrene butadiene block copolymer is 70% by weight or more, or styrene The total proportion of the isoprene block copolymer and the styrene butadiene block copolymer is preferably 70% by weight or more. In a preferred embodiment, substantially all (for example, 95 to 100% by weight) of the styrenic block copolymer is a styrene isoprene block copolymer. In another preferred embodiment, substantially all (for example, 95 to 100% by weight) of the styrenic block copolymer is a styrene butadiene block copolymer. According to such a composition, an adhesive sheet that is excellent in repulsion resistance and well balanced with other adhesive properties can be suitably realized.

  The styrenic block copolymer may be in the form of a diblock body, a triblock body, a radial body, a mixture thereof, and the like. In a triblock body and a radial body, it is preferable that the styrene block is arranged at the terminal of the polymer chain. This is because the styrene blocks arranged at the end of the polymer chain are likely to gather to form a styrene domain, thereby forming a pseudo cross-linked structure and improving the cohesiveness of the pressure-sensitive adhesive. The styrenic block copolymer used in the technology disclosed herein is, for example, a diblock ratio of 30% by weight or more (more preferably) from the viewpoint of adhesive strength (peeling strength) to the adherend and repulsion resistance. Is preferably 40% by weight or more, more preferably 50% by weight or more, particularly preferably 60% by weight or more, and typically 65% by weight or more. A styrenic block copolymer having a diblock ratio of 70% by weight or more (for example, 75% by weight or more) may be used. From the viewpoint of holding power and the like, a styrenic 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 block copolymer having a styrene content of usually 10% by weight or more (more preferably more than 10% by weight, for example, 12% by weight or more) is preferred. Further, from the viewpoint of the adhesive strength to the adherend, the styrene 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). Coalescence is preferred. For example, a styrene 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 composed 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 composed of a urethane-based resin containing, as a base polymer, a urethane-based polymer obtained by reacting a polyol and a polyisocyanate compound. The urethane polymer is not particularly limited, and any appropriate urethane polymer (ether polyurethane, ester polyurethane, carbonate polyurethane, etc.) that can function as an adhesive can be adopted. Examples of the polyol include polyether polyol, polyester polyol, polycarbonate polyol, polycaprolactone polyol, and the like. Examples of the polyisocyanate compound include diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, and the like.

(Filler particles)
The pressure-sensitive adhesive layer disclosed herein preferably contains filler particles. Thereby, both the maintenance of the initial adhesive strength A and the reduction of the tensile peeling stress B can be preferably realized. This point will be described. The filler particles contained in the pressure-sensitive adhesive layer may exist in a state 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 area of the pressure-sensitive adhesive on the pressure-sensitive adhesive surface and improve the slip property in the shear direction of the adhesive interface. As a result, the tensile peel stress B is reduced, but the reduction of the adhesive area on the adhesive surface also causes a decrease in the initial adhesive force A. On the other hand, it is considered that the filler particles present in the pressure-sensitive adhesive layer greatly contribute to the reduction of the tensile peeling stress B without reducing the initial adhesive force A. The main reason for this is not particularly limited and can be interpreted as a change in the state of the pressure-sensitive adhesive layer accompanying the deformation of the pressure-sensitive adhesive sheet. Specifically, tensile peeling is an aspect in which the pressure-sensitive adhesive is peeled in a direction parallel to the adhesive surface (tensile peeling direction, also referred to as shear direction), and thus the pressure-sensitive adhesive sheet is deformed in the direction at the time of tensile peeling. . The stretchable pressure-sensitive adhesive sheet stretches with respect to the above tension, and the pressure-sensitive adhesive layer is deformed accordingly. For example, when the film-like base material that supports the pressure-sensitive adhesive layer has extensibility with respect to tension, the pressure-sensitive adhesive layer is also greatly deformed as the base material is extended. It is considered that the deformation of the pressure-sensitive adhesive layer increases the exposure amount of the filler particles contained in the pressure-sensitive adhesive layer to the pressure-sensitive adhesive surface and improves the slip property in the shear direction at the adhesion interface. It is also considered that the pressure-sensitive adhesive (adhesive component) is deformed by tensile peeling in the pressure-sensitive adhesive layer, 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 behavior between the pressure-sensitive adhesive and the filler particles with respect to the tensile peeling contributes to the reduction of the tensile peeling stress. The above-described change in the surface state of the pressure-sensitive adhesive layer and the behavior of the pressure-sensitive adhesive layer components are considered to be such that they are not manifested by, for example, 90-degree peeling or 180-degree peeling, or can be ignored from the difference in the peeling mode. It is done. However, it is considered that the stress change is greatly affected at the time of tensile peeling. As a result, it is considered that the filler particles contained in the pressure-sensitive adhesive layer greatly contribute to both the maintenance of the initial adhesive strength A and the reduction of the tensile peeling stress B. The effect of containing the filler particles is particularly noticeable in the pressure-sensitive adhesive sheet having extensibility. In an extensible adhesive sheet having a substrate, typically, the mechanical properties of the substrate can greatly contribute to the adhesive strength (typically 180 degree peel strength), so that an adhesive composition (for example, tackifying) It is thought that the contribution to the adhesive strength of additives such as an agent and a crosslinking agent is relatively small. In such a pressure-sensitive adhesive sheet, an effect of selectively reducing only the tensile peeling stress B while maintaining the initial pressure-sensitive adhesive force A is preferably realized by including filler particles in the pressure-sensitive adhesive layer.

  The kind of filler particle used is not particularly limited. For example, a particulate or fibrous filler can be used. The constituent material of filler particles (typically particulate filler) is, for example, metals such as copper, silver, gold, platinum, nickel, aluminum, chromium, iron, stainless steel; aluminum oxide, silicon oxide (silicon dioxide), oxidation Metal oxides such as titanium, zirconium oxide, zinc oxide, tin oxide, copper oxide, 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, dowsonite, borax, zinc borate; silicon carbide, boron carbide, Carbides such as nitrogen carbide and calcium carbide; nitriding such as aluminum nitride, silicon nitride, boron nitride and gallium nitride Carbonates such as calcium carbonate; titanates such as barium titanate and potassium titanate; carbonaceous materials such as carbon black, carbon tubes (carbon nanotubes), carbon fibers and diamond; glass; inorganic materials such as polystyrene; Acrylic resin (for example, polymethyl methacrylate), phenol resin, benzoguanamine resin, urea resin, silicone resin, polyester, polyurethane, polyethylene, polypropylene, polyamide (for example, nylon), polyimide, polymer such as polyvinylidene chloride, and the like. 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 these, a particulate filler is preferable from the viewpoint of reducing tensile peeling stress, and among these, 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, it is preferable that 50% by weight or more of the filler particles contained in the pressure-sensitive adhesive layer have a particle diameter smaller than the thickness of the pressure-sensitive adhesive layer. Thereby, the tendency for the adhesive surface to maintain a good surface state is increased, and the desired adhesive properties (for example, initial adhesive force A) can be preferably exhibited. Moreover, the tendency for the external appearance of the pressure-sensitive adhesive layer surface to be maintained well 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 the entire amount (typically 99 to 100% by weight) of the filler particles contained in the pressure-sensitive adhesive layer has a particle size smaller than the thickness of the pressure-sensitive adhesive layer. In another preferred embodiment, 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 from the viewpoint of improving the surface state of the pressure-sensitive adhesive surface. However, it has a particle size smaller than 2/3 (that is, 2 / 3T, more preferably 1/2, that is, 1 / 2T) of the thickness T of the pressure-sensitive adhesive layer. Note that X weight% or more of 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 measurement based on the sieving method is X ( % By weight). The proportion (% by weight) of filler particles having a predetermined particle diameter can be determined based on the particle size distribution.

  In a preferred embodiment, the filler particles contained in the pressure-sensitive adhesive layer account for 50% by weight or more (for example, 70% by weight or more, typically 90% by weight or more) of particles having a particle size of less than 30 μm. Such a pressure-sensitive adhesive layer containing filler particles is advantageous in terms of maintaining adhesive strength and appearance, since the smoothness of the pressure-sensitive adhesive surface is hardly impaired even if the filler particle content is relatively increased. The filler particles contained in the pressure-sensitive adhesive layer have a particle size of less than 20 μm (for example, less than 15 μm, typically less than 10 μm), 50% by weight or more (for example, 70% by weight or more, typically 80% by weight or more). More preferably.

  Moreover, in one preferable aspect, the ratio of the particle | grains which have a particle diameter of less than 1 micrometer among the filler particles contained in an adhesive layer is 50 weight% or less. From the viewpoint of reducing the tensile peeling stress, it is desirable that the filler particles have a certain size. Moreover, it is preferable in terms of productivity that the amount of fine particles is limited, for example, an excessive increase in viscosity does not occur in the preparation of the pressure-sensitive adhesive composition. Of the filler particles contained in the pressure-sensitive adhesive layer, the proportion of particles having a particle size of less than 1 μm (eg, less than 2 μm, typically less than 5 μm) is 30% by weight or less (eg, 10% by weight or less, typically 5% or less) is more preferable.

  The average particle size of the entire filler particles contained in the pressure-sensitive adhesive layer is usually suitably 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 is increased, the tensile peeling stress reduction effect tends to be improved, and the tensile peeling stress B can be efficiently reduced by adding a small amount of filler particles. Setting the average particle size to a predetermined value or more is also preferable in terms of maintaining good viscosity and dispersibility of the composition. The upper limit of the average particle diameter is usually suitably 50 μm or less, preferably 30 μm or less, more preferably 25 μm or less, and even more preferably 15 μm or less. When the average particle size is small, a decrease in the adhesive performance tends to be suppressed. It is desirable that the average particle size is small in terms of the appearance of the adhesive surface. In this specification, the average particle size of the filler particles refers to the particle size (50% median diameter) at which the cumulative particle size based on weight is 50% in the particle size distribution obtained by the measurement based on the 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 the bulk shape includes, for example, a spherical shape, a rectangular parallelepiped shape, a crushed shape, or a deformed shape thereof. The shape of the filler particles is preferably a bulk shape, and more preferably a spherical shape.

  The average aspect ratio of the filler particles is not particularly limited, and is preferably less than about 100 from the viewpoint of reducing tensile peeling stress, preferably less than 50, more preferably less than 10 (for example, less than 5, typically less than 2). It can be. Here, the average aspect ratio of the filler particles is obtained as an average value of the aspect ratios of the respective particles represented by the major axis / minor axis in the filler particles. The major axis typically refers to the maximum difference length of the particles to be measured, and the minor axis typically refers to the minimum difference length of the particles to be measured. The average aspect ratio can be grasped through transmission electron microscope observation.

When the pressure-sensitive adhesive layer contains filler particles, the filler particle content C in the pressure-sensitive adhesive layer is suitably 30% by volume or less. By appropriately adjusting the particle diameter and content of the filler particles, the tensile peeling stress B can be preferably reduced while suppressing a decrease in the initial adhesive strength A. The filler particle content C 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). Further, from the viewpoint of reducing tensile peeling stress, the content C is suitably 0.3% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more (for example, 5% by volume). % Or more, 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. However, it may not be included, or the dispersant may be included. The filler particle content C [% by volume] is determined based on the weight ratio and density of components other than the filler particles in the pressure-sensitive adhesive layer (typically, the pressure-sensitive adhesive component), and the weight ratio and density of the filler particles. For example, the content C [volume%] of the filler particles in the pressure-sensitive adhesive layer can be determined by adopting 2.42 g / cm ³ as the density of aluminum hydroxide.

  When the pressure-sensitive adhesive layer contains filler particles, the content of filler particles (for example, inorganic material particles, typically metal oxides or metal hydroxides) in the pressure-sensitive adhesive layer is 100 wt. The amount is suitably less than 100 parts by weight with respect to parts. By appropriately adjusting the particle diameter and content of the filler particles, the tensile peeling stress B can be preferably reduced while suppressing a decrease in the initial adhesive strength A. The content of 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) with respect to 100 parts by weight of the base polymer. ). Further, from the viewpoint of reducing 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 preferably 8 parts by weight. This is the above (for example, 12 parts by weight or more, typically 25 parts by weight or more).

(Acrylic oligomer)
The pressure-sensitive adhesive composition disclosed herein may contain an acrylic oligomer. By adopting an acrylic oligomer, impact resistance and repulsion resistance can be improved in a well-balanced manner. Further, in the case of curing the pressure-sensitive adhesive composition by active energy ray irradiation (for example, UV irradiation), the acrylic oligomer is harder to inhibit curing (for example, unreacted than, for example, a rosin-based or terpene-based tackifier resin). It has the advantage of hardly causing polymerization inhibition of the reactive 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 the acrylic polymer.

  The proportion of the acrylic monomer in the total 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 only of acrylic monomers.

  As the constituent monomer component of the acrylic oligomer, a chain alkyl (meth) acrylate, a functional group-containing monomer, and other monomers exemplified as monomers that can be used in the acrylic polymer can be used. Moreover, the said structural monomer may also contain alicyclic hydrocarbon group containing (meth) acrylate. As a monomer component which comprises an acryl-type oligomer, the 1 type (s) or 2 or more types of the various monomers illustrated above can be used.

As said chain | strand-shaped alkyl (meth) acrylate, the alkyl (meth) acrylate whose R _< ² _> is _C1-12 (for example, _C1-8 ) in the said Formula (1) is used preferably. Preferable examples thereof include methyl methacrylate (MMA), ethyl acrylate, n-butyl acrylate (BA), isobutyl methacrylate, t-butyl acrylate, and 2-ethylhexyl acrylate (2EHA). Of these, 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 Examples thereof include amino group-containing monomers such as ethyl (meth) acrylate; amide group-containing monomers such as N, N-diethyl (meth) acrylamide; carboxy group-containing monomers such as AA and MAA; and hydroxyl group-containing monomers such as HEA.

  As said alicyclic hydrocarbon group containing (meth) acrylate, 1 type of alicyclic hydrocarbon group containing (meth) acrylate in which the carbon atom number of an alicyclic hydrocarbon group exists in the range of 4-20, for example. Or 2 or more types 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. Of these, dicyclopentanyl methacrylate (DCPMA) is more preferable.

  The proportion of the alicyclic hydrocarbon group-containing (meth) acrylate in all monomer components constituting the acrylic oligomer (that is, the copolymerization proportion) is about 30 to 90% by weight (from the viewpoint of tackiness and cohesion) ( 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 acid ester in the total 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). The monomer component constituting the acrylic oligomer is more preferably 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 one preferred embodiment, the weight ratio of the weight percentage of the chain-alkyl (meth) weight ratio of acrylate (W _A) and the alicyclic hydrocarbon group-containing (meth) acrylate in the constituent monomer components of the acrylic oligomer (W _B) (W _A : W _B ) is 1: 9 to 9: 1, preferably 2: 8 to 7: 3 (eg, 3: 7 to 6: 4, typically 3: 7 to 5: 5). It is.

  Although it does not specifically limit, the composition (namely, superposition | polymerization composition) of the structural monomer component of an acrylic oligomer can be set so that Tg of this acrylic oligomer may be 10 to 300 degreeC. 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 component 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. Moreover, it is preferable that said Tg is 60 degreeC or more (for example, 100 degreeC or more typically 120 degreeC or more) from a cohesive viewpoint of an 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 adhesive properties (for example, adhesive strength and repulsion resistance), 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 cohesiveness of the pressure-sensitive adhesive, the Mw is preferably 0.2 × 10 ⁴ or more (eg, 0.3 × 10 ⁴ or more). The molecular weight of the acrylic oligomer can be adjusted by using a chain transfer agent as necessary during the polymerization.

  The acrylic oligomer can be formed by polymerizing its constituent monomer components. The polymerization method and the polymerization mode are not particularly limited, and various conventionally known polymerization methods (for example, solution polymerization, emulsion polymerization, bulk polymerization, photopolymerization, radiation polymerization, etc.) can be employed in an appropriate mode. Since the types and amounts of polymerization initiators that can be used as needed (for example, azo polymerization initiators such as AIBN) are generally as described above, the description thereof will not be repeated here.

  The content of the acrylic oligomer in the pressure-sensitive adhesive composition disclosed herein is suitably 0.5 parts by weight or more with respect to 100 parts by weight of the acrylic polymer. From the viewpoint of better exerting the effect of the acrylic oligomer, the content of the acrylic oligomer is preferably 1 part by weight or more (eg, 1.5 parts by weight or more, typically 2 parts by weight or more). . Further, from the viewpoint 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), The amount 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 such a small amount of addition, an improvement in impact resistance and repulsion resistance can be realized by using an acrylic oligomer.

(Tackifier)
The pressure-sensitive adhesive layer disclosed herein may be a composition containing a tackifier. The tackifier is not particularly limited, for example, rosin tackifier resin, terpene tackifier resin, hydrocarbon tackifier resin, epoxy tackifier resin, polyamide tackifier resin, elastomer tackifier resin, Various tackifying resins such as a phenolic tackifying resin and a ketone tackifying resin can be used. Such tackifier resin can be used individually by 1 type or in combination of 2 or more types.

  Specific examples of rosin-based tackifying resins include unmodified rosins such as gum rosin, wood rosin, tall oil rosin (raw rosin); modified rosins modified by hydrogenation, disproportionation, polymerization, etc. Hydrogenated rosin, disproportionated rosin, polymerized rosin, other chemically modified rosins, etc. The same shall apply hereinafter.); Other various rosin derivatives; Examples of the rosin derivative include rosins such as those obtained by esterifying an unmodified rosin with an alcohol (that is, an esterified product of rosin) and those obtained by esterifying a modified rosin with an alcohol (that is, an esterified product of a modified rosin). Esters: Unmodified rosins and modified rosins modified with unsaturated fatty acids Unsaturated fatty acid modified rosins; Unmodified rosins, modified rosins, unsaturated rosin esters modified with unsaturated fatty acids Rosin alcohols obtained by reducing carboxyl groups 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; rosins (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 employed as the base polymer, it is preferable to use a rosin tackifier resin. From the viewpoint of improving adhesive properties such as adhesive strength, one of these rosin-based tackifying resins can be selected alone, or two or more of different types and properties (for example, softening point) can be used in combination. More preferably.

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

  Examples of hydrocarbon tackifying resins 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, coumarone resins, coumarone indene resins, and the like.

  In the technology disclosed herein, a resin having a softening point (softening temperature) of about 70 ° C. or higher (preferably about 100 ° C. or higher, more preferably about 110 ° C. or higher) can be preferably used as the tackifying resin. According to the pressure-sensitive adhesive containing the tackifying resin having the softening point equal to or higher than the lower limit value described above, a pressure-sensitive adhesive sheet with more excellent adhesive force can be realized. Of the tackifying resins exemplified above, a terpene tackifying resin having a softening point (for example, a terpene-modified phenol resin), a rosin tackifying resin (for example, an esterified product of polymerized rosin), or the like can be preferably used. The upper limit of the softening point of the tackifying resin is not particularly limited, and can be, for example, about 200 ° C. or lower (typically about 180 ° C. or lower). In addition, the softening point of the tackifier resin here is defined as a value measured by a softening point test method (ring and ball method) defined 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 target tack performance (adhesive strength, etc.). For example, the tackifier is used at a ratio of about 10 to 100 parts by weight (more preferably 20 to 80 parts by weight, still more preferably 30 to 60 parts by weight) with respect to 100 parts by weight of the acrylic polymer based on the solid content. It is preferable to do. You may implement the technique disclosed here in the aspect provided with the adhesive layer which does not contain a tackifier substantially.

  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 tackifier resin. The pressure-sensitive adhesive sheet of this embodiment is preferable from the viewpoint of repulsion resistance and holding power. 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, more preferably 135 ° C. or higher, for example, 140 ° C. or higher). Further, from the viewpoint of adhesive strength to the adherend, 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 (eg 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 singly or in appropriate combination of two or more. As a preferable embodiment, there is an embodiment in which the high softening point resin contains one or more terpene phenol resins. For example, a terpene phenol resin having a softening point of 120 ° C. or higher and 200 ° C. or lower (typically 120 ° C. or higher and 180 ° C. or lower, eg, 125 ° C. or higher and 170 ° C. or lower) can be preferably used.

  As the terpene phenol resin, those having a softening point of 120 ° C. or higher and a hydroxyl value (OH value) of 40 mgKOH / g or more (typically 40 to 200 mgKOH / g, for example 40 to 160 mgKOH / g) are preferable. 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 defined in JIS K 0070: 1992 can be adopted. As a specific measuring method, a method described in JP 2014-55235 A is employed.

  The technology disclosed here is, for example, that the rubber 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 160 mgKOH / g (for example, 80-140 mgKOH / g) of the high softening point resin (H2) may be preferably used in combination. In this case, the relationship between the amounts used of the high softening point resin (H1) and the high softening point resin (H2) is such that, for example, the weight ratio (H1: H2) is in the range of 1: 5 to 5: 1. In general, it is appropriate to set the range of 1: 3 to 3: 1 (for example, 1: 2 to 2: 1). A preferred embodiment 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 viewpoint of repulsion resistance and holding power, the content of the high softening point resin can be, for example, 20 parts by weight or more with respect to 100 parts by weight of the base polymer, 30 parts by weight or more (for example, 35 parts by weight or more). ) Is preferable. From the viewpoint of adhesive strength, low temperature characteristics, etc., the content of the high softening point resin relative to 100 parts by weight of the base polymer is usually suitably 100 parts by weight or less, preferably 80 parts by weight or less, more preferably 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. instead of or in addition to the high softening point resin. Can be implemented. As a preferable embodiment, an embodiment in which the rubber-based pressure-sensitive adhesive includes 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. can be given.

  As the low softening point resin, one having a softening point of, for example, 40 ° C. or higher (typically 60 ° C. or higher) can be used. From the viewpoint of repulsion resistance, holding power, and the like, usually, those having a softening point of 80 ° C or higher (more preferably 100 ° C or higher) and lower than 120 ° C can be preferably used. A low softening point resin having a softening point of 110 ° C. or higher and lower than 120 ° C. may be used.

  The technology disclosed herein can be preferably implemented in an embodiment in which the rubber-based pressure-sensitive adhesive includes 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 occupying 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 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, β-pinene polymer) is preferable. Substantially all of the low softening point resin (for example, 95% by weight or more) may be a terpene resin.

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

  From the viewpoint of adhesive strength 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) with respect to 100 parts by weight of the base polymer. The above is appropriate. From the viewpoint of repulsion resistance and the like, it is usually appropriate that the content of the low softening point resin is 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). 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 relationship between the amounts used is that the weight ratio of low softening point resin: high softening point resin is 1: 5 to 3: 1 (more preferably Is preferably set to be 1: 5 to 2: 1). In the technology disclosed herein, the rubber-based pressure-sensitive adhesive includes an aspect in which a higher softening point resin is included as a tackifier resin than a low softening point resin (for example, a weight ratio of a low softening point resin to a 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 technique disclosed herein, the content of the tackifying resin with respect to 100 parts by weight of the base polymer (typically a rubber-based polymer) is usually appropriately 20 parts by weight or more, preferably 30 parts by weight. More preferably, it is 40 parts by weight or more (for example, 50 parts by weight or more). Further, from the viewpoint of low temperature characteristics (for example, adhesive strength and impact resistance under low temperature conditions), the content of the tackifying resin with respect to 100 parts by weight of the base polymer is usually appropriately 200 parts by weight or less. The amount is preferably 150 parts by weight or less. The content of the tackifier resin relative 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 contain a crosslinking agent as necessary. The kind in particular of a crosslinking agent is not restrict | limited, It can select from a conventionally well-known crosslinking agent suitably and can be used. Examples of such crosslinking agents include isocyanate crosslinking agents, epoxy crosslinking agents, oxazoline crosslinking agents, aziridine crosslinking agents, melamine crosslinking agents, peroxide crosslinking agents, metal chelate crosslinking agents, and the like. It is done. A crosslinking agent can be used individually by 1 type or in combination of 2 or more types. Among these, from the viewpoint of improving cohesive strength, it is preferable to use an isocyanate-based crosslinking agent or an epoxy-based crosslinking agent, and an isocyanate-based crosslinking agent is more preferable.

  The amount of the crosslinking agent used is not particularly limited, and is, for example, about 10 parts by weight or less (for example, about 0.005 to 10 parts by weight, preferably about 0.01 to 100 parts by weight with respect to 100 parts by weight of the base polymer (for example, acrylic polymer). 5 parts by weight). Since the technique disclosed here can achieve the desired tensile peeling stress B without reducing the amount of the crosslinking agent used, the amount of the crosslinking agent used is approximately 0 with respect to 100 parts by weight of the acrylic polymer. It may be 1 part by weight or more (for example, 0.8 part by weight or more, typically 1.2 parts by weight or more). Further, from the viewpoint of reducing the tensile peeling stress B by limiting the cohesive force, the amount of the crosslinking agent used is about 5 parts by weight or less (for example, 3 parts by weight or less, typically less than 100 parts by weight of the acrylic polymer). May be 2 parts by weight or less).

(Other ingredients)
The pressure-sensitive adhesive composition can be used as required by leveling agents, crosslinking aids, plasticizers, softeners, colorants (dyes, pigments), antistatic agents, anti-aging agents, ultraviolet absorbers, antioxidants, light It may contain various additives generally used in the field of pressure-sensitive adhesive compositions, such as stabilizers and dispersants. Further, for example, an adhesive strength adjusting agent such as a silicone oligomer may be added to the pressure-sensitive adhesive composition (typically an acrylic pressure-sensitive adhesive composition). About such various additives, conventionally well-known things can be used by a conventional method, and since it does not characterize this invention in particular, detailed description is abbreviate | 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-type pressure-sensitive adhesive composition, a hot-melt 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 a form containing a pressure-sensitive adhesive (pressure-sensitive adhesive layer forming component) in a water-based solvent (water-based solvent), and is typically dispersed in water. What is called a type pressure-sensitive adhesive composition (a composition in which at least a part of the pressure-sensitive adhesive is dispersed in water) and the like are included. Moreover, a solvent-type adhesive composition means the adhesive composition of the form which contains an adhesive in an organic solvent. The technique disclosed here is preferably implemented in an aspect including a pressure-sensitive adhesive layer formed from a solvent-type pressure-sensitive adhesive composition from the viewpoint of suitably realizing pressure-sensitive adhesive properties such as pressure-sensitive adhesive strength.

(Method for 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 peelable surface (peeling surface) and drying it can be employed. Alternatively, a method (direct method) of forming the pressure-sensitive adhesive layer by directly applying (typically applying) the pressure-sensitive adhesive composition to the film-like substrate and drying it can be employed. Also, a method of transferring a pressure-sensitive adhesive layer to a film-like substrate (transfer) by forming a pressure-sensitive adhesive layer on the surface by applying a pressure-sensitive adhesive composition to a peelable surface (peeling surface) and drying it (transfer) Method). As the release surface, the surface of the release liner, the back surface of the substrate after the release treatment, or the like can be used. The pressure-sensitive adhesive layer disclosed herein is typically formed continuously, but is not limited to such a form, for example, a regular or random pattern such as a dot or stripe. The formed adhesive layer may be sufficient.

  The pressure-sensitive adhesive composition can be applied using a conventionally known coater such as a gravure roll coater, a die coater, or a bar coater. Alternatively, the pressure-sensitive adhesive composition may be applied by impregnation or curtain coating. Moreover, it is preferable to perform drying of an adhesive composition under heating from viewpoints, such as acceleration | stimulation of a crosslinking reaction and a manufacturing efficiency improvement. 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, it may be further aged for the purpose of adjusting component migration in the pressure-sensitive adhesive layer, progress of the crosslinking reaction, relaxation of strain that may exist in the base material or pressure-sensitive adhesive layer, etc. Good.

(Adhesive layer thickness)
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 8 to 100 μm from the viewpoints of productivity such as drying efficiency and adhesive performance. More preferably, it is 15-80 micrometers. In the case of a double-sided pressure-sensitive adhesive sheet having pressure-sensitive adhesive layers 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-like base material disclosed here exhibits a breaking strength of 10 MPa or more. By using the film-like base material exhibiting the above breaking strength, the pressure-sensitive adhesive sheet is more difficult to tear and can exhibit excellent tensile removability. According to the film-like base material exhibiting the breaking strength, workability 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). Further, from the viewpoint of 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 said breaking strength is measured by the method similar to the case of an adhesive sheet. The breaking strength of the base material can be adjusted by, for example, selecting the base material type (selecting the blending ratio of the hard component and the soft component), the molding method, and the like.

  The film-like substrate disclosed herein preferably exhibits an elongation at break of 300% or more. The base material exhibiting the elongation at break extends with respect to the tension when the pressure-sensitive adhesive sheet is removed. By this extension, the adhesive sheet is deformed and peeled off from the adherend. In this way, the tension and the deformation of the base material interact with each other, and the tensile removability (especially shear removability) of the pressure-sensitive adhesive sheet is further improved. 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. The elongation at break is measured by the same method as that for the pressure-sensitive adhesive sheet.

  It is appropriate that the film-like substrate disclosed herein exhibits a tensile recovery rate of more than 50%, and the tensile recovery rate is preferably 70% or more. The tensile recovery rate is more preferably 80% or more (for example, 90% or more, typically 93% to 100%). Thereby, damages, such as tearing at the time of adhesive sheet removal, can be prevented more highly. The tensile recovery rate is measured by a method similar to the method for measuring the tensile recovery rate of the pressure-sensitive adhesive sheet. The tensile recovery rate of the base material can be adjusted, for example, by selecting the base material type (selecting the mixing ratio of the hard component and the soft component), the molding method, and the like.

  The film-like substrate disclosed herein preferably exhibits a 5% modulus of less than 10 MPa. When the 5% modulus of the film-like substrate is less than the predetermined value, when removing from the adherend by stretching and deforming the pressure-sensitive adhesive sheet, the resistance at the beginning of pulling tends to decrease and the tensile removability tends to be excellent. is there. The 5% modulus is more preferably less than 5 MPa (for example, 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 workability for attaching the adhesive sheet. The 5% modulus is measured according to the “tensile stress” measuring method described in JIS K 7311: 1995. More specifically, using a No. 3 dumbbell-shaped test piece (width 5 mm, marked line interval 20 mm), the tensile stress was 300 mm / min, and the stress when the marked line distance was extended by 5% [MPa ] 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, for example, by selecting the base material type (selecting the mixing ratio of the hard component and the soft component), the molding method, and the like.

  The film-like substrate disclosed herein preferably exhibits a 100% modulus of less than 10 MPa. By making the 100% modulus of the film-like substrate less than the predetermined value, when removing from the adherend by pulling and stretching the pressure-sensitive adhesive sheet, the resistance at the beginning of pulling tends to decrease and the tensile removability tends to be excellent. is there. The 100% modulus is more preferably less than 5 MPa. The lower limit of the 100% modulus is not particularly limited, but it is usually suitably 0.5 MPa or more (for example, 1 MPa or more) from the viewpoint of the workability of attaching the adhesive sheet. The 100% modulus is measured by the same method as that for the pressure-sensitive adhesive sheet.

  The film-like substrate disclosed herein preferably exhibits a 150% modulus of less than 20 MPa. By making the 150% modulus of the film-like substrate less than a predetermined value, the resistance at the time of the tensile removal work tends to be small when the adhesive sheet is removed from the adherend by stretching and deforming. The 150% modulus is more preferably less than 15 MPa (for example, less than 12 MPa, typically less than 8 MPa). The lower limit of the 150% modulus is not particularly limited, but is usually 1 MPa or more (for example, 5 MPa or more) from the viewpoint of workability for attaching the adhesive sheet. The 150% modulus is measured according to the “tensile stress” measuring method described in JIS K 7311: 1995. More specifically, using a No. 3 dumbbell-shaped test piece (width 5 mm, marked line interval 20 mm), the tensile stress was 300 mm / min, and the stress [MPa when the marked line distance was increased by 150%] ] Is assumed to be 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, for example, by selecting the base material type (selecting the mixing ratio of the hard component and the soft component), the molding method, and the like.

Various film-like substrates can be used as the film-like substrate (supporting substrate) for supporting (lining) the pressure-sensitive adhesive layer. As the substrate, for example, a woven fabric film, a nonwoven fabric film, or a resin film can be used. Among these, a resin film is preferable. The resin film may be a non-foamed resin film, a rubber-like film, a foam film, or the like. Of these, non-foamed resin films and rubber-like films are preferred, and non-foamed resin films are more preferred. The non-foamed resin film is substantially free of bubbles that can be a weak point in terms of mechanical strength, and tends to be superior in mechanical strength such as tensile strength as compared with a foam. Non-foamed resin films are also excellent in terms of processability, dimensional stability, thickness accuracy, economy (cost), and the like.
In addition, the “resin film” in this specification is a substantially non-porous film and is a concept that is distinguished from a so-called nonwoven fabric or woven fabric (ie, a concept that excludes nonwoven fabric or woven fabric). In addition, the non-foamed resin film refers to a resin film that has not been intentionally processed to form a foam. Specifically, the non-foamed resin film may 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). Non-foamed resin films include, 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 polyurethane, ester polyurethane and carbonate polyurethane; urethane (meth) acrylate polymers; polyethylene (PE), polypropylene (PP) And polyolefins such as ethylene-propylene copolymer and ethylene-butene copolymer; polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate, and polybutylene naphthalate; polycarbonates; As the polyester, polybutylene terephthalate (PBT), polyethylene naphthalate, and polybutylene naphthalate are more preferable. The resin material is a styrene 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, or a styrene isoprene styrene copolymer. It may be a coalescence (typically a styrene elastomer), an acrylic copolymer called acrylic rubber, or a vinyl chloride resin (PVC) such as soft polyvinyl chloride. Good. The said resin material can be used individually by 1 type or in combination of 2 or more types. In addition, what is generally called rubber | gum and a thermoplastic elastomer is included in the said resin material.

  In a preferred embodiment, the film-like substrate is a polyurethane resin film. Here, the polyurethane-based resin film refers to a resin film containing polyurethane as a main component of a resin component (a component having the highest blending ratio, typically a component that exceeds 50% by weight; the same shall apply hereinafter). . A polyurethane-based resin film is typically made of a material that does not substantially exhibit a yield point, and is a film material that can easily realize a pressure-sensitive adhesive sheet that exhibits a predetermined breaking strength and elongation and, if necessary, a tensile recovery rate. It is. Since the polyurethane resin film can also realize good physical properties without adding an additive component such as a plasticizer, for example, it is a preferable group in the technology disclosed herein from the viewpoint of preventing the additive component from bleeding out. 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-based resin film disclosed herein may be a film made of a polymer blend of polyurethane and other resin. Said other resin may be 1 type (s) or 2 or more types, such as acrylic resin, polyolefin, polyester, a polycarbonate, for example. Or the technique disclosed here can be implemented also in the aspect using the base material which does not contain resin components other than a polyurethane substantially.

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

  Examples of polyols 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 that are polycondensates of the above diols with dicarboxylic acids (eg, adipic acid, azelaic acid, sebacic acid) Polyols; carbonate diols such as polyalkylene carbonate diols; 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, 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 , 4-diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, methylcyclohex 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 addition to polyol and polyisocyanate, other copolymerization components may be introduced into the polyurethane. 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 copolymerization components is suitably less than 30% by weight (for example, less than 10% by weight, typically less than 5% by weight) in the polyurethane. The technique disclosed here can also be preferably implemented in an embodiment including a polyurethane-based resin film base material mainly composed of polyurethane not containing other copolymerization components.

  In another preferred embodiment, the film-like 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) acrylate can be used individually by 1 type or in combination of 2 or more types. The urethane (meth) acrylate preferably has two or more urethane bonds and two or more (meth) acryloyl groups. 2-5 are preferable and, as for the number of the (meth) acryloyl group which urethane (meth) acrylate has, 2-3 are more preferable. For example, urethane (meth) acrylate having two (meth) acryloyl groups can be preferably used. The urethane (meth) acrylate is preferably urethane acrylate. Here, “urethane acrylate” refers to a (meth) acryloyl group contained in urethane (meth) acrylate in which the number ratio of acryloyl groups exceeds 50%.

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

  In another preferred embodiment, the film-like substrate is a PVC resin film. The PVC-based resin film is produced by molding a PVC-based resin composition (molding material) containing a PVC-based resin into a film shape. 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). About 80% by weight or more (more preferably about 90% by weight or more) of the total resin component contained in the PVC-based resin composition is preferably 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 having physical properties suitable as a base material for an adhesive sheet can be formed.

  For film bases (for example, resin film bases), fillers (inorganic fillers, organic fillers, etc.), colorants (pigments, dyes), anti-aging agents, antioxidants, UV absorption, as necessary Various additives such as an agent, an antistatic agent, a lubricant, a plasticizer, and a stabilizer may be blended. For example, when a soft PVC resin film is used as the film-like substrate, the 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 blending ratio of various additives is usually less than 30% by weight (for example, less than 20% by weight, typically less than 10% by weight).

  The surface of the film-like substrate may be subjected to conventionally known surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of a primer. Such a surface treatment may be a treatment for improving the adhesion between the film-like substrate and the pressure-sensitive adhesive layer, in other words, the anchoring property of the pressure-sensitive adhesive layer to the substrate. In addition, when a film-like base material is a polyurethane-type resin film, favorable anchoring property can be acquired even if the above surface treatments are not performed by the height of the surface energy.

  The film-like substrate may have a single layer structure or a multilayer structure of two layers, three layers or more. In the case of a multilayer structure, at least one layer (preferably all layers) is preferably a layer having a continuous structure of the resin (more preferably polyurethane). The manufacturing method of a film-form base material should just employ a conventionally well-known method suitably, and is not specifically limited. When a resin film substrate is employed as the film substrate, for example, a conventionally known general film molding method such as extrusion molding, inflation molding, T-die casting molding, calendar roll molding, etc., is appropriately employed. A resin film substrate can be used.

  The thickness of the film-like substrate is not particularly limited and can be appropriately selected depending on the purpose. Usually, the thickness is suitably 10 μm or more, preferably about 30 μm or more (for example, 40 μm or more, typically 70 μm or more). The film-like base material having the above thickness is difficult to break and can be excellent in tensile removability. The thickness of the film-like substrate is suitably 3 mm or less (for example, 2 mm or less, typically 1.5 mm or less). Further, the thickness of the film-like 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 employed for a non-foamed resin film substrate. According to the technology disclosed herein, good tensile removability can be realized even in a configuration using a base material having a thickness equal to or less than the predetermined thickness. In addition, reducing the thickness of the film-like substrate is advantageous in terms of reducing the thickness, reducing the size, reducing the weight, and saving resources of the pressure-sensitive adhesive sheet.

<Release liner>
A conventional release paper or the like can be used as the release liner, and is not particularly limited. For example, it consists of 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 adhesive material such as a fluorine-based polymer (polytetrafluoroethylene, etc.) or a polyolefin resin (polyethylene, polypropylene, etc.). A release liner or the like can be used. The release treatment layer may be formed, for example, by surface-treating the liner base material 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, or the like as long as it exhibits its function. The tab basically has a planar shape, and when viewed from above, the tab has a triangular shape, a circular shape, an elliptical shape, a semicircular shape, a semielliptical shape, a belt shape, etc. Various shapes can be adopted within the range to be exhibited. The tab according to a preferred embodiment is a quadrangular resin film. As for the material of the tab, any material may be used as long as it has rigidity capable of withstanding pulling when the adhesive sheet is removed. For example, the material exemplified as the material of the above-mentioned film-like substrate (for example, a resin film such as a PET film, a nonwoven fabric, a woven material) Appropriate ones can be selected from among the fabrics.

  The tab preferably exhibits a breaking strength of 10 MPa or more. This prevents damage such as tearing of the tab when the adhesive sheet is peeled off. Moreover, there exists a tendency which is excellent also in workability. The breaking strength is more preferably 20 MPa or more, and further 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 surface (at least one of the front surface and the back surface (preferably both)) of the outer surface of the tab 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 against a 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”. Further, the fact that the outer surface of the tab has low adhesiveness means that the adhesive strength of the outer surface of the tab (typically against SUS180) is higher than the surface (adhesive surface) of the adhesive sheet that forms the adhesive product with the tab together with the tab. Degree peel strength). The tab is typically non-tacky on both sides of its outer surface, but one may be non-tacky and the other low tacky.

  The thickness of the tab is not particularly limited, but it is preferable that the thickness of the tab is equal to or greater than a predetermined thickness in order to give a strength that does not break when the adhesive sheet is pulled. The thickness of the tab is usually suitably 10 μm or more, 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 (for example, 2 mm or less, typically 1.5 mm or less), and the thickness of the tab 50 is preferably 300 μm or less, preferably 200 μm or less (for example, 150 μm). Hereinafter, typically, it is more preferably 120 μm or less.

<Application>
Although the adhesive product with a tab disclosed here is not particularly limited, for example, metal materials such as stainless steel (SUS) and aluminum; inorganic materials such as glass and ceramics; nylon, polycarbonate (PC), polymethyl methacrylate (PMMA) ), A resin material such as polypropylene or polyethylene terephthalate (PET); a rubber material such as natural rubber or butyl rubber; and a composite material or the like, and affixed to an adherend having a surface.

  The tabbed pressure-sensitive adhesive product disclosed herein can be smoothly peeled off from the adherend (typically by pulling off). Taking advantage of this feature, it is preferably used as an adhesive product for various uses that can be re-peeled after application. For example, for fixing a protective panel (lens) that protects a display unit for electronic equipment, for fixing a decoration panel of a display (for example, a television display), for fixing a battery pack of a personal computer, and for waterproofing a lens of a digital video camera, The tabbed adhesive product disclosed herein can be employed. Among them, it is preferably used as a pressure-sensitive adhesive product with a tab for a portable electronic device that requires an adhesive strength of a predetermined level or more during use, but requires smooth removal when repairing, exchanging, inspecting, or recycling components. it can. For example, mobile phones, smartphones, tablet computers, laptop computers, various wearable devices (for example, wristwear devices that are worn on the wrist like wristwatches, modular devices that are worn on a part of the body with clips, straps, etc.) (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 machines, electronic dictionaries, electronic notebooks, electronic books, in-vehicle information equipment, portable radios, portable TVs, mobile phones Protects display units in portable electronic devices such as printers, portable scanners, and portable modems Protection 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 dissipation materials, graphite sheets) Can be preferably used for applications such as fixation of logos (design characters) and display objects (including various marks) such as various designs. Of the adhesive products with tabs disclosed herein, those exhibiting an adhesive strength of a predetermined level or more are attached to the impact when the portable electronic device falls when used in the portable electronic device. A fixed arrangement of members may be maintained. This is particularly advantageous in battery fixing applications. This is because the battery to be fixed can expand with use over time, so there is a gap around it, and poor fixing due to dropping impact etc. (peeling of the adhesive sheet) tends to be a significant defect. . In this specification, “carrying” means that it is not sufficient to be able to carry it alone, but that it has a level of portability that allows an individual (standard adult) to carry it relatively easily. Shall mean.

  Moreover, the adhesive product with a tab excellent in tensile removability is suitable as an adhesive product with a tab used for the purpose of fixing a battery (including a primary battery and a secondary battery, for example, a polymer battery) in a portable electronic device. In many cases, the battery is usually disposed at a place where it is necessary to remove the component (including the battery) of the portable electronic device when repairing, exchanging, or inspecting the component. Therefore, the adhesive product for fixing the battery is frequently required to be removed. However, removal of the battery by using physical means such as use of a removal tool, peeling off, or heating may damage the battery and may not be preferable in terms of safety. Reduction of peeling force by photocuring is not effective because it is irradiated through the battery due to the application site of the adhesive product. The adhesive product with a tab disclosed here uses the above-described method of pulling out (typically pulling out) when removing the battery after the period of use while demonstrating the function of fixing the battery well. Thus, the removal can be easily performed. The above-mentioned adhesive product is particularly preferable as an adhesive product used for the purpose of fixing a polymer battery. Because polymer batteries tend to be more easily deformed than other types of batteries (typically batteries with a metal case), conventional peeling methods can deform the battery and impair its function. there were. According to the adhesive product with tabs disclosed herein, the adhesive product with tabs can be satisfactorily removed while suppressing deformation of the polymer battery by using the above-described pull removal (typically pulling and removing) method. it can.

  In addition, adhesive products with tabs used to fix batteries in portable battery devices may not be pulled parallel to the shearing direction when removed due to other parts around the battery or due to battery placement. There are many. In such a case, the tabbed adhesive product is removed by pulling at an angle that is non-parallel 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). Therefore, there is a risk of damage due to contact with an adherend (battery) or an obstacle during removal. According to the technique disclosed herein, even in such a removal mode, the tabbed adhesive product can be preferably removed without being damaged.

  Further, the above-mentioned adhesive product with a tab having excellent tensile removability (typically pull-out removability) is attached to a wall surface, a pillar, furniture, a household appliance, a glass surface, etc. It is also suitable as an adhesive product used for the purpose of fixing an article or a part (an adherend, an object to be fixed, an object to be bonded, etc.). Also in this application, the adhesive product performs a good fixing function while fixing the article, etc., and when removing the article, the entire adhesive product is pulled out by grasping the tab provided on the adhesive product. Thus, removal of the adhesive product (for example, removal in the direction of the arrow in FIG. 14C) can be performed efficiently.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. When there are a plurality of embodiments, the configurations described in different embodiments can be combined as appropriate. 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 extensible adhesive sheet and a tab are provided,
The pressure-sensitive adhesive sheet is a pressure-sensitive adhesive product with a tab having a plurality of portions extending from the tab.
(2) The adhesive sheet comprises two or more adhesive sheet pieces,
The said 2 or more adhesive sheet piece is an adhesive product with a tab as described in said (1) connected to the said tab, respectively.
(3) Each of the two or more pressure-sensitive adhesive sheet pieces has a band shape, and is arranged so as to extend in a longitudinal direction of each pressure-sensitive adhesive sheet piece when the tab is pulled. The adhesive product with a tab as described in 2).
(4) Each of the two or more pressure-sensitive adhesive sheet pieces is a pressure-sensitive adhesive product with a tab according to (3), wherein a tab is fixed to an end portion thereof.
(5) The tabbed adhesive product according to (4), wherein the two or more adhesive sheet pieces are arranged in parallel to each other.
(6) The pressure-sensitive adhesive product with a tab according to any one of (1) to (5), wherein the pressure-sensitive adhesive sheet is a double-sided adhesive pressure-sensitive adhesive sheet.
(7) Used to join two objects, and in a state where the two objects are joined with the adhesive sheet sandwiched therebetween, the adhesive sheet expands by pulling the tab, and the two objects The adhesive product with a tab according to the above (6), wherein the bonding state is released.
(8) Used to join two or more members to a substrate,
Each of the said adhesive sheet pieces is an adhesive product with a tab as described in said (6) which joins each of the said 2 or more member to the said base material.
(9) The tab has two or more adhesive sheet piece fixing portions for fixing each of the two or more adhesive sheet pieces.
The adhesive product with a tab according to (7) or (8), wherein the two or more adhesive sheet piece fixing portions are connected in a separable state.
(10) The tabbed adhesive product 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 the polymer component contained in the pressure-sensitive adhesive layer,
The acrylic polymer has a formula (1):
CH ₂ = C (R ¹ ) COOR ² (1)
(R ¹ in the above formula (1) is a hydrogen atom or a methyl group. R ² is a chain alkyl group having 1 to 20 carbon atoms.) An alkyl (meth) acrylate represented by: The adhesive product with a tab according to any one of the above (1) to (10), which is contained at a ratio of 70% by weight or more.
(12) The alkyl (meth) acrylate includes 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 , 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 monomers include acrylic acid, methacrylic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate and 4 -Adhesive product with a tab as described in said (11) or (12) which is at least 1 sort (s) selected from the group which consists of hydroxybutyl (meth) acrylate.
(14) The pressure-sensitive adhesive layer includes a tackifier resin having a softening point of 100 ° C. or higher,
The tackifier resin according to any one of the above (11) to (13), wherein the tackifier resin includes at least one of a rosin tackifier resin and a terpene tackifier resin.
(15) The adhesive product with a tab according to any one of (11) to (14), wherein the pressure-sensitive adhesive layer contains 10 to 60 parts by weight of a tackifier with respect to 100 parts by weight of the acrylic polymer.
(16) The 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 are 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, calcium hydroxide. , Zinc hydroxide, silicic acid, iron hydroxide, copper hydroxide, barium hydroxide, zirconium oxide hydrate, tin oxide hydrate, basic magnesium carbonate, hydrotalcite, dowsonite, borax, zinc borate, silicon carbide Boron carbide, nitrogen carbide, calcium carbide, aluminum nitride, silicon nitride, boron nitride, gallium nitride, calcium carbonate, barium titanate, and potassium titanate are at least one selected from the above (11) to The adhesive product with a tab according to any one of (16).

(18) The above-mentioned (11) to (17), further comprising a film-like substrate that supports the pressure-sensitive adhesive layer, wherein the film-like 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 one of the above.
(19) The film-like base material according to (18), including at least one resin material selected from the group consisting of polyurethane, urethane (meth) acrylate-based polymer, polyolefin, polyester, and polyvinyl chloride. Adhesive product 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 polyurethane, an ester polyurethane or a carbonate 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 the above (1) to (20), which includes a pasting portion that is pasted on an adherend, and a non-pasting portion that is positioned between the pasting portion and the tab. Adhesive product with tabs.
(22) When the tab is pulled in a state where the pasting part is bonded to the adherend, the non-pasting part is preferentially stretched over the pasting part, and by this stretching, the pasting part becomes the adherend. The adhesive product with a tab according to the above (21), which begins to peel off from the body.
(23) The adhesive product with a tab according to (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 tabbed pressure-sensitive adhesive product 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 tabbed pressure-sensitive adhesive product according to any one of (21) to (24), wherein an area ratio of the non-sticking portion in the pressure-sensitive adhesive sheet is 1 to 10%.
(26) The tabbed pressure-sensitive adhesive product according to any one of (21) to (25), wherein the pressure-sensitive adhesive sheet is a double-sided adhesive pressure-sensitive adhesive sheet.
(27) The pressure-sensitive adhesive sheet includes a film-shaped substrate, a first pressure-sensitive adhesive layer provided on the first surface of the film-shaped substrate, and a second pressure-sensitive adhesive provided on the second surface of the film-shaped substrate. An adhesive product with a tab according to (26) above, comprising an agent layer.
(28) Used to join two objects, and in a state where the two objects are joined with the adhesive sheet sandwiched therebetween, the adhesive sheet expands by pulling the tab, and the two objects The adhesive product with a tab according to the above (26) or (27), wherein the bonding state of is released.
(29) In a state where the two objects are bonded with the adhesive sheet interposed therebetween, the non-adhering portion and the tab are exposed to the outside of the two objects, and the non-adhering portion is used as the two objects. The tabbed pressure-sensitive adhesive product according to any one of the above (26) to (28), wherein the tab is brought into contact with one of the two and the tab is along the outer surface of the one object.
(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 adhesive pressure-sensitive adhesive sheet,
The pressure-sensitive adhesive sheet has an affixing part for joining two objects, and an anchor part fixed only to one of the two objects,
The said sticking part is an adhesive product with a tab in any one of said (1)-(30) arrange | positioned between the said anchor part and the said tab.
(32) In the state where the two objects are bonded with the pressure-sensitive adhesive sheet sandwiched therebetween, the pressure-sensitive adhesive sheet is extended by pulling the tab, and the bonded state of the two objects is released (31 ) Adhesive products with tabs.
(33) When the tab is pulled in a state where the pasting portion is bonded to the two objects, the pasting portion is extended and peeled off 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 extends by elastic deformation.
(35) The pressure-sensitive adhesive sheet has a band shape, the tab is fixed to one end in the longitudinal direction of the pressure-sensitive adhesive sheet, and the anchor portion is located at the other end in the longitudinal direction of the pressure-sensitive adhesive sheet, The adhesive product with a tab according to any one of (31) to (34).
(36) The adhesive product with a tab according to (35), wherein the adhesive sheet has a strip shape extending linearly or curvedly.
(37) The tabbed pressure-sensitive adhesive product according to (35) or (36), wherein the ratio (L / W) of the length L to the width W of the pressure-sensitive adhesive sheet is 2 or more.
(38) The tabbed pressure-sensitive adhesive product according to any one of (31) to (37), wherein an area ratio of the anchor portion in the pressure-sensitive 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 the first surface of the film-shaped substrate, and a second pressure-sensitive adhesive provided on the second surface of the film-shaped substrate. An adhesive product with a tab according to any one of (31) to (38), comprising an agent layer.
(40) The tabbed pressure-sensitive adhesive product 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 adhesive sheet with a tab according to any one of (1) to (40), wherein the adhesive sheet has a band shape, and the band shape of the adhesive sheet has a bent portion.
(42) The pressure-sensitive adhesive product with a tab according to (41), wherein the pressure-sensitive adhesive sheet has a shape along at least a part of an outer periphery of an adherend surface to which the pressure-sensitive adhesive sheet is attached.
(43) The adhesive product with a tab according to (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 wave shape.
(45) The adhesive product with a tab according to any one of (41) to (44), wherein the adhesive sheet exhibits a breaking strength of 10 MPa or more.
(46) The adhesive product with a tab according to any one of (41) to (45), wherein the adhesive sheet has a width of 5 mm or less.
(47) The tabbed pressure-sensitive adhesive product according to any one of (41) to (46), wherein the pressure-sensitive adhesive sheet is a double-sided adhesive pressure-sensitive adhesive sheet.
(48) The pressure-sensitive adhesive sheet includes a film-shaped substrate, a first pressure-sensitive adhesive layer provided on the first surface of the film-shaped substrate, and a second pressure-sensitive adhesive provided on the second surface of the film-shaped substrate. A tabbed pressure-sensitive adhesive product according to (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 sandwiched therebetween, the adhesive sheet extends by pulling the tab, and the two objects The adhesive product with a tab according to the above (47) or (48), wherein the bonded state of is released.
(50) The tabbed pressure-sensitive adhesive product according to any one of (41) to (49), which is used for fixing a battery of a portable electronic device.

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

(61) An adhesive product with a tab comprising an extensible adhesive sheet and a tab fixed to the adhesive sheet,
The (1) to (60) above, wherein the tab includes a first tab film fixed to the first surface of the pressure-sensitive adhesive sheet, and a second tab film fixed to the second surface of the pressure-sensitive adhesive sheet. An adhesive product with a tab according to any one of the above.
(62) The tabbed adhesive product according to (61), wherein the first tab film is smaller than the second tab film.
(63) The first surface of the pressure-sensitive adhesive sheet to which the first tab film is fixed has an affixing portion that is affixed to an adherend and an exposed portion that protrudes from the affixing surface of the adherend. And
The said exposure part is an adhesive product with a tab as described in said (62) located between the said sticking part and the said 1st tab film.
(64) The tabbed adhesive product according to any one of (61) to (63), wherein the first tab film has a thickness different from that of the second tab film.
(65) The tabbed adhesive product according to any one of (61) to (64), wherein the first tab film is made of a material different from that of the second tab film.
(66) The tabbed adhesive product according to any of (61) to (65), wherein the first tab film and the second tab film do not protrude from the adhesive sheet.
(67) The pressure-sensitive adhesive product with tabs according to any one of (61) to (66), wherein the pressure-sensitive adhesive sheet is a double-sided adhesive pressure-sensitive adhesive sheet.
(68) The pressure-sensitive adhesive sheet includes a film-shaped substrate, a first pressure-sensitive adhesive layer provided on the first surface of the film-shaped substrate, and a second pressure-sensitive adhesive provided on the second surface of the film-shaped substrate. A tabbed adhesive product according to (67), comprising an agent layer.
(69) Used to join two objects, and in a state where the two objects are joined with the adhesive sheet sandwiched therebetween, the adhesive sheet expands by pulling the tab, and the two objects The adhesive product with a tab according to the above (67) or (68), wherein the bonding state of is released.
(70) The adhesive product with a tab according to any one of (61) to (69), which is used for fixing a battery of a portable electronic device.

A1, A2 object (adherence)
M1, M2 member (attachment member)
S substrate (substrate to be adhered)
401, 402 Adhesive product with tabs 410, 710 (Extensible) Adhesive sheet 430a, 430b Adhesive sheet piece 450 Tab 452a, 452b Adhesive sheet piece fixing part 454 Separation line 720 Film-like substrate 721, 722 Adhesive layer

Claims (10)

Equipped with an extensible adhesive sheet and a tab,
The pressure-sensitive adhesive sheet is a pressure-sensitive adhesive product with a tab having a plurality of portions extending from the tab. The pressure-sensitive adhesive sheet comprises two or more pressure-sensitive adhesive sheet pieces,
The adhesive product with a tab according to claim 1, wherein the two or more adhesive sheet pieces are connected to the tab, respectively.   Each of the two or more pressure-sensitive adhesive sheet pieces has a band shape, and is arranged so as to extend in the longitudinal direction of each pressure-sensitive adhesive sheet piece when the tab is pulled. Tabbed adhesive products.   The adhesive product with a tab according to claim 3, wherein a tab is fixed to an end of each of the two or more adhesive sheet pieces.   The tabbed adhesive product according to claim 4, wherein the two or more adhesive sheet pieces are arranged in parallel to each other.   The pressure-sensitive adhesive product with tabs according to any one of claims 2 to 5, wherein the pressure-sensitive adhesive sheet is a double-sided adhesive pressure-sensitive adhesive sheet.   In a state where two objects are joined and the two objects are joined with the adhesive sheet sandwiched therebetween, the adhesive sheet is extended by pulling the tab, and the joined state of the two objects The adhesive product with a tab according to claim 6, wherein is released. Used to join two or more members to a substrate,
Each of the said adhesive sheet piece is an adhesive product with a tab of Claim 6 which joins each of the said 2 or more member to the said base material. The tab has two or more adhesive sheet piece fixing portions for fixing each of the two or more adhesive sheet pieces,
The tabbed adhesive product according to claim 7 or 8, wherein the two or more adhesive sheet piece fixing portions are connected to each other in a separable state.   The adhesive product with a tab according to any one of claims 1 to 9, which is used for fixing a battery of a portable electronic device.

Images