JP6765797B2 - Adhesive products with tabs - Google Patents

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 applies hereinafter) exhibits a soft solid state (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 adhesive is preferably used in the form of an adhesive sheet for fixing parts in portable electronic devices such as mobile phones, smartphones, and tablet personal computers. Further, the adhesive sheet attached to the adherend can be removed from the adherend at the time of repair, replacement, inspection, recycling, etc. of the adherend and its peripheral members. Patent Documents 1 to 6 are examples of documents that disclose prior art relating to this type of removable pressure-sensitive adhesive sheet. All of Patent Documents 1 to 6 disclose prior art relating to an stretchable adhesive sheet having a tab. Patent Document 1 relates to a medical adhesive sheet to be attached to the skin.

Special Table 2005-500133 Japanese Unexamined Patent Publication No. 2000-96006 Japanese Unexamined Patent Publication No. 2000-96007 Japanese Unexamined Patent Publication No. 2002-23546 Japanese Unexamined Patent Publication No. 2002-23558 Special Table 2010-531917

When removing the adhesive sheet from the adherend, it is desirable that the removal work is completed without deforming or damaging the adherend regardless of the strength of the adherend. As one of the means, Patent Documents 2 to 6 disclose a method using an stretchable adhesive sheet. In this method, a tab is provided at the end of the stretchable adhesive sheet, and after the adhesive sheet is attached, the tab is gripped and pulled to stretch and deform the adhesive sheet to reduce the adhesive area. As a result, the adhesive sheet is removed from the adherend. Since this pressure-sensitive adhesive sheet has extensibility, the load on the adherend when the pressure-sensitive adhesive sheet is peeled off is significantly reduced. However, when the adhesive product that joins two objects (adhesions) is removed by pulling it by the above method, when one object is peeled off from the adhesive product, the other object that has not been completely peeled off is the adhesive product. It will be pulled with. As a result, the other object may be damaged. Further, since the elongation deformation of the pressure-sensitive adhesive sheet in this method can be elastic deformation, the end portion of the pressure-sensitive adhesive sheet that was finally peeled off by elastic repulsion as soon as the pressure-sensitive adhesive sheet was stretched and peeled off from the adherend by pulling the tab. May return vigorously to the removal worker and collide with the worker's hand. As described above, the above method does not always have good removal workability.

The present invention has been created in view of the above circumstances, and an object of the present invention is to provide a tabbed adhesive product having excellent removal workability.

According to the present invention, there is provided a tabbed adhesive product comprising an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet. The adhesive sheet is a double-sided adhesive sheet. Further, the adhesive sheet has a sticking portion for joining two objects and an anchor portion fixed to only one of the two objects. The sticking portion is arranged between the anchor portion and the tab.
According to the above configuration, when the tab is pulled while the adhesive sheet is attached to the object (adhesive body), the adhesive sheet attachment portion is stretched and peeled off from the object, and the anchor portion is fixed to one of the objects. It is held in the state. By fixing the anchor portion, when one of the two objects is peeled off from the adhesive product, the event that the other object that has not been peeled off is pulled and moved together with the adhesive product is prevented. As a result, damage to the object due to the movement and collision of the object with the operator are prevented. Therefore, according to the present invention, the workability of removing the tabbed adhesive product is improved.

In a preferred embodiment of the technique disclosed herein, in a tabbed adhesive product, the adhesive sheet is stretched by pulling the tab in a state where the two objects are joined with the adhesive sheet sandwiched between them. It is possible to release the bonded state of the two objects. By pulling the tabbed adhesive product in the above manner, the bonded state of the two objects can be smoothly released. The two objects can be two places, one article or one member.

In a preferred embodiment of the technique disclosed herein, when the tab is pulled while the sticking portion is adhered to the two objects, the sticking portion is stretched and peeled off from the two objects. , The anchor portion can be held in a state of being fixed to one of the two objects. Such a tabbed adhesive product is excellent in removal workability.

In a preferred embodiment of the technique disclosed herein, the pressure-sensitive adhesive sheet has the property of stretching due to elastic deformation. Since the stretch deformation of the adhesive sheet is elastic deformation, when the adhesive sheet is stretched and peeled off from the object by pulling the tab, there is a risk that the end portion of the adhesive sheet collides with the removal operator due to the elastic repulsion. However, by applying the technology disclosed here, the above risk can be eliminated.

In a preferred embodiment of the technique disclosed herein, the pressure-sensitive adhesive sheet has a strip shape. Further, the tab is fixed to one end of the adhesive sheet in the longitudinal direction. Further, the anchor portion is located at the other end of the adhesive sheet in the longitudinal direction. By pulling a tab arranged at one end in the longitudinal direction of the adhesive sheet having a band shape, after the adhesive sheet sticking part is peeled off from the object, the anchor part is fixed to one object at the end of the adhesive sheet. Is held at. In a preferred embodiment, the pressure-sensitive adhesive sheet has a strip shape that extends linearly or curvedly.

In a preferred embodiment of the technique disclosed herein, the ratio (L / W) of the length L to the width W of the pressure-sensitive adhesive sheet is 2 or more. Since the adhesive sheet having such a shape is easy to pull along the longitudinal direction, the adhesive sheet can be smoothly peeled off from the object (adhesive body) by pulling the tab arranged at one end in the longitudinal direction.

In a preferred embodiment of the technique disclosed herein, the area ratio of the anchor portion in the pressure-sensitive adhesive sheet is 1 to 10%. Since the area ratio of the anchor portion is within a predetermined range, the anchor portion is securely fixed and held by the object while securing the area of the sticking portion.

In a preferred embodiment of the technique disclosed herein, the pressure-sensitive adhesive sheet comprises a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a first of the film-like base material. It includes a second pressure-sensitive adhesive layer provided on two surfaces.

The tabbed adhesive products disclosed herein are preferably used in portable electronic devices. The tabbed adhesive products disclosed here have excellent removal workability, and by utilizing this feature, battery fixing applications that are often removed during repairs and replacements of components that make up electronic devices, product inspections, etc. It is particularly preferably used as an adhesive product of. The techniques disclosed herein provide a tabbed adhesive product that is preferably used to secure a battery. Therefore, according to the present specification, a portable electronic device in which a member (for example, a battery) is fixed by a tabbed adhesive product is provided.

Further, according to the present invention, there is provided a method of attaching a tabbed adhesive product to two objects. This method comprises a step of preparing a tabbed adhesive product having a double-sided adhesive and stretchable adhesive sheet and a tab provided at one end of the adhesive sheet; the adhesive sheet is attached to the two objects. The step of attaching to the adhesive sheet; and the step of fixing the anchor portion of the adhesive sheet to only one of the two objects; Here, the sticking portion is arranged between the anchor portion and the tab. The tabbed adhesive product attached to the object by this method is excellent in removal workability when the adhesive product is removed from the object. Therefore, according to the technique disclosed herein, there is provided a method of releasing the adhesive state between the two objects and the adhesive product after carrying out the above-mentioned pasting method.

It is a top view which shows typically one configuration example (embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object). It is a top view which shows typically one configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object). It is a figure corresponding to FIG. 2, and is a schematic diagram for demonstrating the role of the non-sticking portion when peeling off the adhesive product with a tab from the adherend. It is a schematic view of one configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object) as viewed from above. It is a schematic view of another configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object) as viewed from above. It is a schematic view of another configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object) as viewed from above. It is a top view which shows typically one configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object). It is a top view which shows typically another configuration example (reference embodiment) of the adhesive product with a tab in the state of being attached to the adherend (object). It is a schematic view of one configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object) as viewed from above. It is a schematic view of another configuration example (reference embodiment) of a tabbed adhesive product in a state of being attached to an adherend (object) as viewed from above. It is a side view which shows typically one configuration example (reference embodiment) of the adhesive product with a tab. It is a schematic side view which shows the part of another configuration example (reference embodiment) of the adhesive product with a tab enlarged. It is a schematic side view which shows the part of another configuration example (reference embodiment) of the adhesive product with a tab enlarged. It is a schematic side view for demonstrating one aspect of tension removal, (a) is a figure which shows the state which starts tension removal, (b) shows the state which pulls a tab and performs removal. FIG. 6C is a diagram showing a state in which tensile removal is completed. It is a schematic top view for demonstrating one aspect of tension removal, (a) is a figure which shows the state which starts tension removal, (b) shows the state which pulls a tab and performs removal. FIG. 6C is a diagram showing a state in which tensile removal is completed. It is sectional drawing which shows one structural example of the adhesive sheet schematically. It is explanatory drawing which shows typically the method of measuring the shear adhesive force. It is explanatory drawing which shows typically the method of measuring the tensile peeling stress B.

Hereinafter, preferred embodiments of the present invention will be described. Matters other than those specifically mentioned in the present specification and necessary for the implementation of the present invention are based on the teachings regarding the implementation of the invention described in the present specification and the common general 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 the present specification and common general technical knowledge in the art. Further, in the following drawings, members / parts having the same function may be described with the same reference numerals, and duplicate description may be omitted or simplified. It should be noted that the embodiments described in the drawings are modeled for clearly explaining the present invention, and the size and scale of the adhesive product, the adhesive sheet, and the tab of the present invention actually provided as a product are not necessarily accurate. It is not a representation.

As described above, the term "adhesive" as used herein refers to a material that exhibits a soft solid state (viscoelastic body) in a temperature range near room temperature and has the property of easily adhering to an adherend by pressure. .. The adhesive referred to here is generally a complex tensile modulus E ^* (1 Hz) as defined in "CA Dahlquist," Adhesion: Fundamental and Practice ", McLaren & Sons, (1966) P. 143". <(typically materials having the properties in 25 ° C.) material having a property that meets the ¹⁰ 7 dyne / cm ² is.

Further, in the present specification, the "extensible adhesive sheet" refers to an adhesive sheet having an extensibility to the extent that an individual (standard adult) can grasp and stretch it. Typically, when the adhesive sheet is pulled in the shearing direction while being attached to the adherend, the adhesive sheet is stretched to reduce the adhesive area with the adherend and finally peel off from the adherend. It can be an adhesive sheet having a degree of extensibility. Preferably, it may be an adhesive sheet that exhibits elongation at break, which will be described later. In addition, in this specification, "extensible adhesive sheet" may be abbreviated simply as "adhesive sheet".

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

Further, in this specification, "tab" is used as a word meaning a "knob" which is a starting point (starting point of pulling) when pulling the adhesive sheet, and other elements (shape, material, etc.) are not particularly limited. .. Normally, 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 by 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 limitation on the shape. For example, a tab with a perforation can have a small size because the hook can be inserted through the perforation and pulled. A typical tab is a flat surface continuous from the pressure-sensitive adhesive sheet, and is preferably not stretched by pulling, or even if stretched, it is less stretchable than the pressure-sensitive adhesive sheet.

<Adhesive products with tabs>
The tabbed adhesive product disclosed herein may have the structure schematically shown in FIG. The tabbed adhesive product 101 shown in FIG. 1 includes an extensible adhesive sheet 110 and tabs 150 provided at the ends of the adhesive sheet 110. The adhesive sheet 110 has a sticking portion 112 and an anchor portion 116. The sticking portion 112 is a portion for joining the objects A1 and A2. The anchor portion 116 is fixed only to the object A2. The sticking portion 112 is arranged between the anchor portion 116 and the tab 150. In this embodiment, in the tabbed adhesive product 101, the anchor portion 116, the sticking portion 112, and the tab 150 have a continuous arrangement relationship in this order.

Since the adhesive sheet 110 joins the objects A1 and A2, it has double-sided adhesiveness. Further, the adhesive sheet 110 has a strip shape extending in a straight line. The sticking portion 112 of the adhesive sheet 110 is sandwiched between the objects A1 and A2, and is adhered to the objects A1 and A2. Specifically, each adhesive surface of the adhesive sheet 110 at the attachment portion 112 is adhered to the objects A1 and A2, respectively. Further, the pressure-sensitive adhesive sheet 110 of this embodiment exhibits rubber elasticity at room temperature (about 10 to 30 ° C.).

An anchor portion 116 is present at one end of the adhesive sheet 110 in the longitudinal direction. Unlike the sticking portion 112, the anchor portion 116 protrudes outside between the objects A1 and A2 and is not adhered to the object A1. In other words, the anchor portion 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 that of the object A1. In this embodiment, the length L of the adhesive sheet 110 in the longitudinal direction is longer than the length 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. The sticking portion 112 and the anchor portion 116 are separated by a straight line corresponding to the outer shell of the object A1 (a straight line orthogonal to the longitudinal direction of the adhesive sheet 110).

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

The area ratio of the anchor portion 116 in the adhesive sheet 110 is preferably 50% or less, preferably 30% or less (for example, 20% or less, typically 20% or less) from the viewpoint of sufficiently securing the area of the sticking portion 112. Is 10% or less). Therefore, the area ratio of the sticking portion 112 is preferably 50% or more, 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 portion 116, it is appropriate that the area ratio of the anchor portion 116 is 1% or more, and it may be about 3% or more (for example, 5% or more). In that case, it is appropriate that the area ratio of the sticking portion 112 is 99% or less, and it may be about 97% or less (for example, 95% or less).

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

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

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

Further, in the above embodiment, the pressure-sensitive adhesive sheet exhibits rubber elasticity at room temperature (about 10 to 30 ° C.) as a whole, but the material and composition of the pressure-sensitive adhesive sheet are not limited to this. The adhesive sheet can be appropriately designed according to the purpose and the like within the range described later. When the adhesive sheet has the property of stretching due to elastic deformation, defects due to its elastic rebound (damage of the adherend, collision of the adherend with the operator, etc.) tend to be remarkable, which are disclosed here. The above-mentioned problems can be solved by applying the technology (installation of the anchor portion). Therefore, by applying the technique disclosed herein to the tabbed adhesive product provided with the adhesive sheet having rubber elasticity, the effect of improving the removal workability can be particularly preferably exhibited.

Further, in the above embodiment, the sticking portion and the anchor portion are separated by a line orthogonal to the longitudinal direction of the adhesive sheet having a band shape, but the present invention is not limited to this. The division between the sticking portion and the anchor portion of the adhesive sheet can be determined according to the shape of the object (adhesive body) to which the sticking portion is attached. In the techniques disclosed herein, the sticking portion may typically be a portion that is entirely affixed to the adherend. On the other hand, the anchor portion is a portion where at least one surface (which may be both sides) is not attached to the adherend, and is typically one of two objects (adhesion). It can be a part that protrudes from the outside. The anchor portion can also be, for example, a portion of the adhesive sheet other than the sticking portion. The sticking portion and the anchor portion may have different color schemes by including a coloring material such as a pigment from the viewpoint of alignment with respect to the adherend. In addition, a line or a mark may be inserted at the boundary between the two.

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

Further, in the above embodiment, the anchor portion has adhesiveness on both sides, but the technique disclosed here is not limited to this. The surface of the anchor portion and the surface of the sticking portion may be made of the same material (typically, an adhesive having the same composition), or may be made of different materials. One side of the anchor portion (exposed surface; the surface opposite to the surface to be attached to one object) may be non-adhesive or low-adhesive. The low adhesiveness of the surface of the anchor portion means that the adhesive strength (typically, peeling strength against SUS 180 degrees) is lower than that of the surface of the sticking portion. For example, the surface of the anchor portion can be made non-adhesive or low-adhesive by applying powder to the adhesive surface of the anchor portion or covering the adhesive surface with a thin film such as a resin film. Further, when the adhesive sheet is an adhesive sheet with a base material, one side of the anchor portion is made non-adhesive or low-adhesive by not forming an adhesive layer on one side or removing the formed adhesive layer. can do. In this case, the anchor portion may be composed of a single-sided adhesive adhesive sheet having no adhesive layer on one side.

Further, in the above embodiment, the anchor portion is exposed from between the two objects, but the present invention is not limited to this, and the anchor portion is in a state where the two objects are joined by the sticking portion. It may exist between two objects. In that case, one side of the anchor portion is non-adhesive. Therefore, the anchor portion does not have to be exposed to the outside of the object (adhesive body).

Further, in the above embodiment, the tab is a quadrangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Alternatively, the adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the adhesive sheet non-adhesive or low-adhesive. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet having a band shape, but the present invention is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet having a strip shape. In that case, anchor portions may be arranged between the tabs arranged at both ends and the sticking portion.

<Adhesive product with tab (reference embodiment 1)>
The tabbed adhesive product disclosed herein may have the structure schematically shown in FIG. The tabbed adhesive product 1 shown in FIG. 2 includes an extensible adhesive sheet 10 and a tab 50 provided at an end of the adhesive sheet 10. Further, the adhesive sheet 10 has a sticking portion 12 to be stuck to the objects (adhesive bodies) A1 and A2, and a non-sticking portion 14 located between the sticking portion 12 and the tab 50. In this embodiment, in the tabbed adhesive product 1, the sticking portion 12, the non-sticking portion 14, and the tab 50 have a continuous arrangement relationship in this order.

The adhesive sheet 10 has a strip shape extending linearly. The sticking 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 is double-sided adhesive, and each pressure-sensitive adhesive surface in the sticking portion 12 is adhered to the objects A1 and A2, respectively. On the other hand, the non-sticking portion 14 protrudes outside between the objects A1 and A2 and does not adhere to the object A1. Therefore, the non-attached portion 14 and the tab 50 arranged beyond the non-attached portion 14 are exposed to the outside of the objects A1 and A2. In this embodiment, the sticking portion 12 and the non-sticking portion 14 are separated by a straight line (a straight line orthogonal to the longitudinal direction of the adhesive sheet 10) corresponding to the outer shell of the object A1.

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

Here, the technical advantage of providing the non-sticking portion 14 in the tabbed adhesive product 1 will be described with reference to FIGS. 2 and 3. The adhesive sheet 10 of the tabbed adhesive product 1 shown in FIG. 2 is a double-sided adhesive adhesive sheet 10 as described above, and each adhesive surface of the sticking portion 12 is adhered to the objects A1 and A2, respectively. When the tab 50 fixed to one end of the adhesive sheet 10 is pulled in the state where the sticking portion 12 is adhered to the objects A1 and A2 in this way, the position is located between the tab 50 and the sticking portion 12 as shown in FIG. The non-sticking portion 14 is extended with priority over the sticking portion 12. This is mainly based on the low resistance and positional relationship of the non-adhesive portion 14 due to non-adhesion. As can be seen from FIG. 3, the extension of the non-sticking portion 14 reduces the adhesive area of the adhesive sheet 10 with the objects A1 and A2 in the sticking portion 12. Normally, the peeling of the sticking portion 12 (typically, peeling by pulling) requires a great deal of force, especially at the initial stage when the adhesive sheet 10 starts to stretch due to the resistance in the state of adhesion with the objects A1 and A2. On the other hand, by providing the non-sticking portion 14, the adhesive sheet 10 starts to peel off from the objects A and A2 with a relatively small force to extend the non-sticking portion 14. As a result, the subsequent peeling in the shear direction can proceed smoothly.

Further, another advantage of providing the non-sticking portion 14 is the positioning of the tab 50. Specifically, after joining the two objects A1 and A2 with the adhesive sheet 10, the adhesive surface of the non-attached portion 14 is brought into contact with the outer surface of the object A1. As a result, the non-attached portion 14 is temporarily fixed to the outer surface (typically, a side surface or the like) of the object (adhesive body) A1, and the tab 50 continuous with the non-attached portion 14 also follows the outer surface of the object A1. It is placed in and does not get in the way. This advantage is more preferably exhibited by setting the length of the non-attached portion (the length of the adhesive sheet 10 in the longitudinal direction) to be relatively long. For example, the non-sticking portion 14 of the adhesive product 1 with a tab is made longer than the height of the side surface of the object A1 to the upper surface of the object A1 (the surface opposite to the surface on which the sticking portion 12 of the adhesive sheet 10 is attached). Design to be reachable. In this configuration, when the adhesive surface of the non-sticking portion 14 is brought into contact with the outer surface of the object A1 and temporarily fixed, the tab 50 is also arranged along the upper surface of the object A1 and does not get in the way.

The area ratio of the non-attached portion 14 in the adhesive sheet 10 is preferably 50% or less, preferably 30% or less (for example, 20% or less, typical) from the viewpoint of sufficiently securing the area of the attached portion 12. 10% or less). Therefore, the area ratio of the sticking portion 12 is preferably 50% or more, 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 portion 14, the area ratio of the non-sticking portion 14 is preferably 1% or more, and may be about 3% or more (for example, 5% or more). By setting the area ratio of the non-sticking portion 14 to a predetermined value or more, it becomes easy to align the tab 50 continuously exposed on the non-sticking portion 14 along the object (adhesive body). In that case, it is appropriate that the area ratio of the sticking portion 12 is 99% or less, and it may be about 97% or less (for example, 95% or less).

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

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

In the above embodiment, the pressure-sensitive adhesive sheet constituting the 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 here is not limited to this. The pressure-sensitive adhesive sheet may be, for example, square-shaped or may have a strip-shaped portion in part. The adhesive sheet typically has a shape extending linearly as in the above embodiment, but is not limited to this, and a shape extending linearly or a shape having a straight line and a curved line (for example, a dogleg shape). Or, it may have a U-shaped shape, an arc-shaped shape, a wavy shape, a zigzag shape, or the like). Further, the adhesive sheet may be a single-sided adhesive adhesive sheet.

Further, in the above embodiment, the sticking portion and the non-sticking portion are separated by a line orthogonal to the longitudinal direction of the adhesive sheet having a band shape, but the present invention is not limited to this. The classification of the sticking portion and the non-sticking portion of the adhesive sheet can be determined according to the shape of the object (adhesive body) to which the sticking portion is attached. In the techniques disclosed herein, the sticking portion may typically be a portion that is entirely affixed to the adherend. On the other hand, the non-attached portion is a portion where at least one surface (which may be both sides) is not attached to the adherend. The non-sticking portion may be, for example, a portion of the adhesive sheet other than the sticking portion. The sticking portion and the non-sticking portion can have different color schemes by including a coloring material such as a pigment from the viewpoint of alignment with respect to the adherend. In addition, a line or a mark may be inserted at the boundary between the two.

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

Further, in the above-described embodiment, the surface of the non-attached portion has adhesiveness, but the technique disclosed herein is not limited to this. The surface of the non-sticking portion and the surface of the sticking portion may be made of the same material (typically, an adhesive having the same composition), or may be made of different materials. The surface of the non-sticking portion may be non-adhesive or low-adhesive. The fact that the surface of the non-attached portion has low adhesiveness means that the adhesive strength (typically, peeling strength against SUS 180 degrees) is lower than that of the surface of the attached portion. For example, the surface of the non-sticking portion can be made non-adhesive or low-adhesive by applying powder to the adhesive surface of the non-sticking portion or covering the adhesive surface with a thin film such as a resin film. When the adhesive sheet is an adhesive sheet with a base material, the surface of the non-adhesive portion is made non-adhesive or low-adhesive by not forming the adhesive layer or removing the formed adhesive layer. be able to. In this case, the non-sticking portion may consist only of the base film in which the pressure-sensitive adhesive layer does not exist.

Further, in the above embodiment, the non-sticking portion is exposed from between the two objects, but the present invention is not limited to this, and the non-sticking portion is such that the two objects are joined by the sticking portion. In the state, it may exist between two objects. In that case, the surface of the non-sticking portion is non-adhesive. Therefore, the non-attached portion does not have to be exposed to the outside of the object (adhesive body).

Further, in the above embodiment, the tab is a quadrangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Alternatively, the adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the adhesive sheet non-adhesive or low-adhesive. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet having a band shape, but the tab is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet having a strip shape. In that case, a non-sticking portion may be arranged between the tabs arranged at both ends and the pasting portion.

<Adhesive product with tab (reference embodiment 2)>
The tabbed adhesive products disclosed herein may have the structure schematically shown in FIG. FIG. 4 shows two tabbed adhesive products 201A and 201B for fixing objects (adhesive bodies) A1 and A2. The tabbed adhesive product 201A arranged above in FIG. 4 includes an extensible adhesive sheet 210 and tabs 250 provided at the ends 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 of the pressure-sensitive adhesive surfaces is adhered to the objects A1 and A2, respectively.

The strip shape of the adhesive sheet 210 has a bent portion 220. When viewed toward the sticking surface of the object A2 to which the adhesive sheet 210 is attached, it can be said that the adhesive sheet 210 has a band shape, and the band has a bent portion 220. In the adhesive sheet 210, the bent portion 220 is provided at three positions, and the adhesive sheet 210 extends linearly except for the bent portion 220. Further, two of the bent portions 220 correspond to two corners forming the outer circumference of the surface (adhesion surface) of the object A1 having a rectangular shape. As a result, the adhesive sheet 210 has a shape partially along the outer periphery of the surface of the object A1. Specifically, the adhesive sheet 210 has a U-shape toward the sticking surface.

Further, in the adhesive sheet 210, each bent portion 220 is bent in a curved shape (in an arc). In this embodiment, each bent portion 220 is bent at a substantially right angle (in an R shape) in an arc shape. By making the bent portion 220 curved, when the adhesive sheet 210 is pulled, problems such as tearing from the bent portion 220 as a starting point are unlikely to occur.

Further, one end (the end opposite to the end on the side where the tab 250 is provided) of the adhesive sheet 210 is a free end. Specifically, one end of the U-shape of the adhesive sheet 210 is a free end. By making one end of the adhesive sheet 210 a free end, the adhesive sheet 210 of the adhesive product 201A with a tab and the adhesive sheet 210 of the adhesive product 201B with a tab are continuous (tabs are provided at both ends of the U-shaped adhesive sheet). The removable adhesive sheet tends to be improved as compared with the adhesive product having the same structure.

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

The tabbed adhesive product 201B arranged downward in FIG. 4 has a different attachment position with respect to the object A1, and the U-shape of the adhesive sheet 210 is opposite to the U-shape of the adhesive sheet 210 of the tabbed adhesive product 201A. It has basically the same configuration as the tabbed adhesive product 201A except that it has a convex orientation. Therefore, duplicate description will be omitted.

The tabbed adhesive product 202 shown in FIG. 5 is a modification of the above embodiment. The adhesive sheet 210 of the tabbed adhesive product 202 has three bent portions 220, and each bent portion 220 is formed at three corners forming the outer circumference of the rectangular object A1 surface (adhesive surface). It corresponds. As a result, the adhesive sheet 210 has a shape along all sides (four sides) of the outer circumference of the surface of the object A1 having a rectangular shape. The adhesive sheet 210 substantially goes around the inside of the outer circumference of the surface of the rectangular object A1, but is not connected to the original adhesive sheet 210, and one end (end) thereof is a free end. That is, the adhesive sheet 210 that goes around the outer circumference of the surface of the object A1 has an acyclic shape. Other matters are basically the same as the configuration shown in FIG. 4, and therefore duplicate description will be omitted.

The tabbed adhesive product 203 shown in FIG. 6 is also a modification of the above embodiment. The adhesive sheet 210 of the tabbed adhesive product 203 has a band shape extending in a curved shape. Specifically, the adhesive sheet 210 has a wavy shape. With this configuration, the adhesive sheet 210 can cover a wide range of the adherend (object) surface (adhesive surface) with a small adhesive area. Other matters are basically the same as the configuration shown in FIG. 4, and therefore duplicate description will be omitted.

The adhesive sheet constituting the tabbed adhesive product has a band shape, but the band shape is not limited to the shape of the above embodiment. For example, it can take a dogleg shape, a U shape, an arc shape, a wavy shape, or the like. Examples of wavy waves include curved ones such as sine waves, pseudo sine waves, and arc waves, and non-curved ones such as zigzags and triangular waves. Further, the adhesive sheet may be a single-sided adhesive adhesive sheet.

Further, in the above embodiment, the bent portion of the pressure-sensitive adhesive sheet is a portion that is bent in a curved shape, but the technique disclosed here is not limited to this. For example, the bent portion does not have to have a curved portion. 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 curvedly folded shape (U-shape). Further, the number of bent portions in the adhesive sheet may be 1 or more, and may be 2 or more (for example, 3 or more).

Further, in the above embodiment, the tab is a quadrangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Alternatively, the adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the adhesive sheet non-adhesive or low-adhesive. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet having a band shape, but the tab is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet having a strip shape.

<Adhesive product with tab (reference embodiment 3)>
The tabbed adhesive products disclosed herein may have the structure schematically shown in FIG. The tabbed adhesive product 301 shown in FIG. 7 includes an extensible adhesive sheet 310 and tabs 350 provided at the ends of the adhesive sheet 310.

The adhesive sheet 310 has a band shape. The adhesive sheet 310 has a portion in the longitudinal direction thereof whose width increases linearly as the distance from the tab 350 starts from the tab 350. Then, the pressure-sensitive adhesive sheet 310 reaches the maximum width at a substantially intermediate point in the longitudinal direction of the pressure-sensitive adhesive sheet 310, and then tapers as the distance from the tab 350 further increases. More specifically, both sides (long sides) 310a and 310b of the adhesive sheet 310 in the longitudinal direction expand in the width direction as the distance from the tab 350 increases, and the adhesive sheet 310 reaches the maximum width. After that, the side portions 310a and 310b reach one end in the longitudinal direction of the pressure-sensitive adhesive sheet 310 (the end opposite to the end on the side where the tab 350 is provided. The free end) while tapering. Further, the maximum width of the adhesive sheet 310 is larger than the width of the tab 350. As a result, the tabbed adhesive product 301 has a relatively large adhesive area with respect to the objects (adhesive 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 adhesive sheet unless otherwise specified.

Further, 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 of the pressure-sensitive adhesive surfaces is adhered to the objects A1 and A2, respectively.

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

The tabbed adhesive product 302 shown in FIG. 8 is a modification of the above embodiment. The adhesive sheet 310 of the adhesive product 302 with a tab is such that only one side (one side) 310a in the longitudinal direction extends in a curved shape so that the width of the adhesive sheet 310 increases as the distance from the tab 350 increases. 310 has reached the maximum width. After that, the one side side 310a extends in a curved shape so as to narrow the width of the adhesive sheet 310, and one end in the longitudinal direction of the adhesive sheet 310 (the end opposite to the end on the side where the tab 350 is provided) is free. You have reached the end). To put it simply, the one side side 310a of the adhesive sheet 310 draws an arc-shaped curve. On the other hand, the other side side 310b of the adhesive sheet 310 in the longitudinal direction extends linearly and is along one side of the rectangular object A1. Other matters are basically the same as the configuration shown in FIG. 7, and therefore duplicate description will be omitted.

Further, although not particularly shown, as another modification of the above embodiment, there is a tabbed adhesive product having a structure in which both sides (both sides) of the adhesive sheet in the longitudinal direction are curved. Specifically, the adhesive sheet of this tabbed adhesive product reaches the maximum width by extending in a curved shape so that the width of the adhesive sheet increases as both sides (both sides) in the longitudinal direction move away from the tab. There is. After that, both sides of the adhesive sheet extend in a curved shape so as to narrow the width of the adhesive sheet, and reach one end in the longitudinal direction of the adhesive sheet (the end opposite to the end on the side where the tab is provided. Free end). ing. In short, both sides of the adhesive sheet draw an arcuate curve. Other matters are basically the same as the configuration shown in FIG. 7, and therefore duplicate description will be omitted.

Further, although not particularly shown, as another modification of the above embodiment, only one side (one side) of the adhesive sheet in the longitudinal direction extends linearly so that the width of the adhesive sheet changes as the distance from the tab increases. Examples include adhesive products with tabs. Specifically, the adhesive sheet of this tabbed adhesive product reaches the maximum width by extending linearly so that the width of the adhesive sheet increases as only one side (one side) in the longitudinal direction moves away from the tab. are doing. After that, the one side side is tapered so as to narrow the width of the adhesive sheet, and reaches one end in the longitudinal direction of the adhesive sheet (the end opposite to the end on the side where the tab is provided. Free end). There is. In short, the adhesive sheet has a dogleg-shaped bending line on one side. On the other hand, the other side of the pressure-sensitive adhesive sheet in the longitudinal direction extends linearly and is along one side of a rectangular object. Other matters are basically the same as the configuration shown in FIG. 7, and therefore duplicate description will be omitted.

Although not particularly shown, the tabbed adhesive products 301 and 302 preferably have a concave step on the surface of the tab 350. This makes it easier to hold (typically grip) the tab 350. In a preferred embodiment, the step can be formed by providing a perforation in the tab 350. By providing a perforation substantially in the center of the surface of the tab 350 having a smooth surface, a configuration that makes it easy to pull the tab 350 can be obtained.

From the viewpoint of space saving, the width of the tab 350 is preferably about 90% or less of the width of the adhesive sheet 310, preferably 80% or less (for example, 70% or less, further) of the width of the adhesive sheet 310. Has a width of 60% or less). Further, from the viewpoint of the removableness of the adhesive sheet, it is appropriate that the tab 350 has a width of about 30% or more of the width of the adhesive sheet 310, and preferably has a width of 50% or more of the width of the adhesive sheet 310. ..

The length of the tab 350 (the length along the longitudinal direction of the adhesive sheet 310) is not particularly limited, but from the viewpoint of the removableness of the adhesive sheet, the length of the tab 350 may be approximately 50% or more of the width of the tab 350. It is suitable and preferably has a length of 70% or more (for example, 90% or more) of the width of the tab 350. Further, from the viewpoint of space saving, it is appropriate that the length of the tab 350 is about 200% or less of the width of the tab 350, preferably 150% or less (for example, 100% or less) of the width of the tab 350. Has a length of.

The adhesive sheet constituting the tabbed adhesive product has a band shape, but the band shape is not limited to the shape of the above embodiment. For example, the strip shape of the adhesive sheet may have a dogleg shape, a U shape, an arc shape, a wavy shape, or the like. Further, the adhesive sheet may be a single-sided adhesive sheet.

Further, in the above embodiment, the width of the pressure-sensitive adhesive sheet changes as the distance from the tab increases, but the width of the pressure-sensitive adhesive sheet is not limited to this, and the pressure-sensitive adhesive sheet may have a certain width. Further, even if the width of the adhesive sheet changes as the distance from the tab increases, for example, the adhesive sheet may have a certain width after the width increases and reaches the maximum width. Alternatively, the adhesive sheet may have a constant width for a while and then increase in width as it moves away from the tab. Further, in the above embodiment, the adhesive sheet has a portion that tapers as it goes away from the tab, but the tapering portion may not be provided.

Further, in the above embodiment, the tab is a quadrangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Alternatively, the adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the adhesive sheet non-adhesive or low-adhesive. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet having a band shape, but the tab is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet having a strip shape.

<Adhesive product with tab (reference embodiment 4)>
The tabbed adhesive products disclosed herein may have the structure schematically shown in FIG. The tabbed adhesive product 401 shown in FIG. 9 includes an stretchable adhesive sheet 410 and a tab 450. The adhesive sheet 410 has two adhesive sheet pieces 430a and 430b as portions extending from the tab 450.

The adhesive sheet 410 is sandwiched between the objects (adhesive 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 of the pressure-sensitive adhesive surfaces is adhered to the objects A1 and A2, respectively. Therefore, the adhesive sheet pieces 430a and 430b constituting the adhesive sheet 410 are also sandwiched between the objects A1 and A2, and each adhesive surface is adhered to the objects A1 and A2.

The adhesive sheet pieces 430a and 430b each have a strip shape extending linearly. A tab 450 is fixed to one end of each of the adhesive sheet pieces 430a and 430b in the longitudinal direction. The adhesive sheet pieces 430a and 430b are separated and arranged at predetermined intervals. Specifically, the adhesive sheet pieces 430a and 430b are parallel to each other. With this arrangement, on the surface (attachment surface) of the object A1 having a rectangular shape, the adhesive sheet pieces 430a and 430b are adhered along the inside of the long side of the surface of the object A1 and exhibit a good adhesive function. Further, the adhesive sheet pieces 430a and 430b extend from the tab 450 in the same direction (to the left of the tab 450 in FIG. 9), and when the tab 450 is pulled in a predetermined direction (to the right in FIG. 9), The adhesive sheet pieces 430a and 430b are arranged so as 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 are pulled by the pulling operation. It extends in the longitudinal direction and peels off from the objects A1 and A2.

The tab 450 has a substantially rectangular shape when viewed from the top surface. 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-stretchable resin film, the surface of which is non-adhesive. The tab 450 is fixed to the adhesive sheet pieces 430a and 430b by being attached to the adhesive surfaces (both sides) at the ends of the adhesive sheet pieces 430a and 430b.

The tabbed adhesive product 402 shown in FIG. 10 is a modification of the above embodiment. The tabbed adhesive product 402 is used for joining 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 main body. Specifically, the adhesive sheet piece 430a constituting the adhesive sheet 410 of the adhesive product 402 with a tab 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 is adhered to the material S and the member M1. Further, the adhesive sheet piece 430b constituting the adhesive sheet 410 is used for joining the base material S and the member M2, and is adhered to the base material S and the member M2 between the base material S and the member M2. There is. Adhesive sheet piece fixing portions 452a and 452b (described later) of the tab 450 are fixed to one end of each of the adhesive sheet pieces 430a and 430b in the longitudinal direction.

The tab 450 is composed of adhesive sheet piece fixing portions 452a and 452b which are connected to each other in a separable state. Specifically, the rectangular tab 450 has a separation line 454 approximately on the midline in its 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 on one of the separation lines 454 (upper in FIG. 10) and the other side of the separation line 454 (lower in FIG. 10) with the separation line 454 as a boundary. It has an adhesive sheet piece fixing portion 452b. The adhesive sheet piece fixing portions 452a and 452b are both continuous (connected) as tabs 450, but can be separated by a separation line 454. In this embodiment, the adhesive sheet piece fixing portions 452a and 452b are separably connected by perforating 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 release 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 the adhesive sheet pieces and pulling only the adhesive sheet piece fixing portion 452b, only the bonding between the base material S and the member M2 can be released.

When the adhesive sheet pieces 430a and 430b constituting the adhesive sheet 410 have a strip shape (typically rectangular shape), the width of each of the adhesive sheet pieces 430a and 430b is 30 mm or less (for example, 20 mm or less, typically 20 mm or less). It can be configured to be about 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 adhesive sheet pieces 430a and 430b has a breaking strength of a predetermined value or more, the width thereof can be set to 10 mm or less (for example, 5 mm or less, further 3 mm or less). Further, from the viewpoint of preventing damage such as tearing during tension removal, the width of each of the adhesive sheet pieces 430a and 430b is preferably 1 mm or more (for example, 3 mm or more, typically 5 mm or more), and is preferably 10 mm. It is more preferable that it is more than (for example, 12 mm or more). The widths of the plurality of adhesive sheet pieces may be the same or different.

When the adhesive sheet pieces 430a and 430b have a strip shape (typically rectangular shape), the length thereof is not particularly limited, and is typically 1 cm or more (for example, 3 cm or more, typically from the viewpoint of removal workability by tension). 5 cm or more). Further, from the viewpoint of removal workability, the length of the adhesive sheet pieces 430a and 430b is preferably 30 cm or less (for example, 15 cm or less, further 5 cm or less). The lengths of the plurality of adhesive sheet pieces may be the same or different.

When the tab 450 has a rectangular shape as in the above embodiment, the length thereof is not particularly limited, and it is appropriate that the tab 450 has a rectangular shape of about 10 mm or more, and 15 mm or more (depending on the width and number of the adhesive sheet pieces). For example, it can be 20 mm or more, typically 30 mm or more). Further, from the viewpoint of space saving around the adherend, it is appropriate that the length of the tab 450 is 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 is double-sided adhesive and is composed of a plurality of pressure-sensitive adhesive sheet pieces having a band shape. However, the shape of the pressure-sensitive adhesive sheet disclosed herein. Is not limited to this. The pressure-sensitive adhesive sheet does not have to be composed of separated pieces of the pressure-sensitive adhesive sheet, and may have two or more portions (portions extending from the tab) of the pressure-sensitive adhesive sheet having a continuous structure. In this case, the portion extending from the tab can exert the same function as the adhesive sheet piece. Further, the adhesive sheet may be a single-sided adhesive adhesive sheet.

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

Further, in the above embodiment, two adhesive sheet pieces have been used, but the present invention is not limited to this. The number of adhesive sheet pieces can be 2 or more (for example, 3 or more). Therefore, the number of members to which the adhesive sheet piece is attached may be 3 or more.

Further, in the above embodiment, the two adhesive sheet pieces (a part of the adhesive sheet) each have a band shape extending linearly and are arranged in parallel with each other. However, the adhesive sheet pieces in the technique disclosed herein have been arranged. The arrangement of (a part of the adhesive sheet) is not limited to the arrangement of the above embodiment. The plurality of adhesive sheet pieces (a part of the adhesive sheet) can be arranged in various arrangements as long as they can be peeled off from the adherend when the tab is pulled. In a preferred embodiment, each piece of adhesive sheet is arranged so that when the tab is pulled, each piece of adhesive sheet extends in the longitudinal direction. For example, in the case of an adhesive sheet piece having a band shape, the crossing angle (inferior angle) of the plurality of adhesive sheet pieces can be in the 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. Another aspect includes an arrangement in which a plurality of adhesive sheet pieces extend in the same direction from the tab. The same direction as described above typically means that a plurality of adhesive sheet pieces are substantially parallel to each other, but the other adhesive sheet pieces are preferably 0 ° to less than 90 ° with respect to one adhesive sheet piece. Includes extending at an angle in the range of 0 ° to 45 ° and even 0 ° to 30 °).

Further, in the above embodiment, the tab is a rectangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Alternatively, the adhesive sheet itself can be used as a tab by performing a treatment for making the surface of the adhesive sheet non-adhesive or low-adhesive. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet piece having a band shape, but the present invention is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet piece having a strip shape. Further, the crossing angle (inferior angle) between the tab and the adhesive sheet piece (a part of the adhesive sheet) was also approximately 90 ° in the above embodiment, but is not particularly limited to this, and the crossing angle is not particularly limited. It can be in the range of approximately 30 to 150 ° (eg, 45 to 135 °, even 60 to 120 °).

Further, in the above-described modification, the tab has a plurality of adhesive sheet piece fixing portions that are separably connected by a separation line, but the adhesive sheet piece fixing portion and the separation line may not be provided. Further, when the adhesive sheet has a piece fixing portion or a separation line, the structure thereof is not limited to the structure of the above embodiment. By appropriately adopting a conventionally known technique, adjacent adhesive sheet piece fixing portions can be connected in a separable state. The position of the separation line does not have to be in the middle of the longitudinal direction of the tab, and an appropriate position can be selected according to the arrangement location and the number of the adhesive sheet piece fixing portions. Further, the number of the adhesive sheet piece fixing portion may be 2 or more (for example, 3 or more).

<Adhesive product with tab (reference embodiment 5)>
The tabbed adhesive products disclosed herein may have the structure schematically shown in FIG. The 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 adhesive sheet 510 is double-sided adhesive, with its first surface 510A adhering to an object (adhesion) A and its second surface 510B adhering to another object (not shown) between the two objects. The two objects are joined together while being sandwiched between the two objects. The adhesive sheet 510 has a strip shape that extends linearly when viewed from the upper surface.

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 the first tab film 560 and the second tab film 562 are laminated with the adhesive sheet 510 sandwiched between them. The first tab film 560 and the second tab film 562 are independent members and are basically separated from each other, but may be partially in contact with each other.

The first tab film 560 and the second tab film 562 have a substantially square shape when viewed from the upper surface. 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 the form in which they overlap also has a substantially square shape. The first tab film 560 and the second tab film 562 of this embodiment are non-stretchable resin films, and the outer surface thereof (the surface opposite to the surface to be attached to the adhesive sheet 510) is 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 attaching, it is fixed to the adhesive sheet 510. A known double-sided adhesive tape or adhesive may be used to fix the pressure-sensitive adhesive sheet to the first and / or second tab film.

When the adhesive sheet 510 is viewed from the upper surface (when viewed toward the sheet surface of the adhesive sheet 510), the first tab film 560 and the second tab film 562 do not protrude from the adhesive sheet 510. In other words, the first tab film 560 and the second tab film 562 do not protrude from the outer edge of the adhesive sheet 510 (typically, the end edge located at one end of the adhesive sheet 510 and both sides thereof). Therefore, the end faces and side surfaces of the adhesive sheet 510 in the end region (predetermined region including one end) to which the first tab film 560 and the second tab film 562 are attached are not covered with the tab 550, and the adhesive sheet. It is exposed when viewed from the side of 510. The shape of the tab 550 in this embodiment is a shape that substantially coincides with the outer circumference (outer edge) of the adhesive sheet 510 at the end portion of the adhesive sheet 510 and its vicinity.

The ratio of the adhesive area of the first tab film 560 to the adhesive sheet 510 on the adhesive sheet pasting surface (one side) is from the viewpoint of limiting the protrusion of the tab 550 to the outside of the adhesive sheet 510 while obtaining a good adhesive state. 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, it is appropriate that the ratio of the adhesive area of the second tab film 562 to the adhesive sheet 510 on the adhesive sheet pasting surface (one side) is 90% or more, preferably 95% or more (for example, 95). % To 100%, typically 99% to 100%).

The thickness of the first tab film 560 and the second tab film 562 can be set according to the purpose and the like, and is not limited to a specific range, but is usually about 1 μm or more and 1 mm or less. Is suitable, preferably 2 μm to 500 μm (eg, 5 μm to 300 μm, typically 10 μm to 100 μm). According to the techniques disclosed herein, the thickness of tabs such that at least one (typically both) of the first and second tab films is 30 μm or greater (eg, 50 μm or greater, and even 70 μm or greater). It is possible to realize excellent adhesion (adhesion between the adhesive sheet and the tab) even in a configuration having a large size. Such a thick tab tends to have excellent grip and workability for removing adhesive products. Further, from the viewpoint of space saving and the like, the thickness of at least one (typically both) of the first and second tab films is limited to 60 μm or less (for example, 40 μm or less, typically 20 μm or less). Is preferable. The thickness of the first tab film 560 and the second tab film 562 may be the same or different.

The tabbed adhesive product 502 shown in FIG. 12 is a modification of the above embodiment. In this tabbed adhesive product 502, the first tab film 560 arranged on the first surface 510A of the adhesive sheet 510 is smaller than the second tab film 562 arranged on the second surface 510B of the adhesive sheet 510. In other words, the area per side of the first tab film 560 is smaller than the area per side of the second tab film 562. Further, the first tab film 560 and the second tab film 562 have different shapes (specifically, different square shapes). Specifically, the first tab film 560 and the second tab film 562 having a quadrangular shape have a width similar to the width of the strip-shaped adhesive sheet 510. Further, one side (a part of the outer edge) of each of the first tab film 560 and the second tab film 562 is along one end edge (outer edge) of the strip-shaped adhesive sheet 510. However, the length of the first tab film 560 (specifically, the length of one side of the square shape) in the longitudinal direction of the adhesive sheet 510 is shorter than that of the second tab film 562.

As described above, since the first tab film 560 has a size smaller than that of 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 the longitudinal direction of the pressure-sensitive adhesive sheet 510. There is an exposed portion 518 corresponding to the difference between the length of the first tab film 560 and the length of the second tab film 562. The exposed portion 518 is located between the sticking portion 512 to be stuck to the adherend A, the sticking portion 512, and the first tab film 560, and protrudes from the sticking 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. Arranged along the outer surface, it does not get in the way. Further, in the above configuration, since the first tab film 560 forms a step (catch step) with respect to the exposed portion 518, it is easy to hold the tab 550. There is no exposed portion on the second surface 510B of the adhesive sheet 510. Other matters are basically the same as the configuration shown in FIG. 11, so duplicate description will be omitted.

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 above range. From the viewpoint of obtaining a sufficient effect of providing the exposed portion _{518, L} T1 _/ L _T2 is preferably set to about 2/3 or less (e.g., about 1/2 or less). From the viewpoint of sufficiently exhibiting the function of the first tab film _560, it is preferable that the L T1 _{/ L T2} is about 1/4 or more (e.g., about 1/3 or higher).

The tabbed adhesive product 503 shown in FIG. 13 is also a modification of the above embodiment. In this tabbed adhesive product 503, the first tab film 560 has a different thickness than the second tab film 562. Specifically, the thickness T _T1 of the first tab film 560 is larger than the thickness T _T 2 of the second tab film 562. As a result, the strength of the tab 550 fixed to the adhesive sheet 510 as a whole is improved, and the workability such as shape processing and perforation is improved. Therefore, the tabs disclosed herein (including the first tab film and the second tab film) may be perforated. 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 shown, an adherend that adheres to the second surface 510B of the adhesive sheet 510 may be arranged on the entire lower surface of the tabbed adhesive product 503 (including the lower surface of the second tab film 562). In that case, the thinness of the second tab film 562 can be an advantageous feature. Other matters are basically the same as the configuration shown in FIG. 11, so duplicate description will be omitted.

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 Not limited. When increasing the thickness T _T1 of the first tab film 560, the ratio ( _TT1 / T _T2 ) should exceed 1 and be approximately 1.5 or more (for example, approximately 2 or more, and further approximately 3 or more). Is appropriate. Further, it is appropriate that the ratio (T _T1 / T _T2 ) is 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., it may be desired to set a large thickness of the second tab film 562. In that case, the ratio (T _T1 / T _T2 ) is less than 1, and it is appropriate to set it to about 2/3 or less (for example, about 1/2 or less, and even about 1/3 or less), and the ratio. It is appropriate that (T _T1 / T _T2 ) is about 1/10 or more (for example, about 1/5 or more, or about 1/2 or more).

In the above embodiment, the pressure-sensitive adhesive sheet constituting the 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 here is not limited to this. The pressure-sensitive adhesive sheet may be, for example, square-shaped or may have a strip-shaped portion in part. The adhesive sheet typically has a shape extending linearly as in the above embodiment, but is not limited to this, and a shape extending linearly or a shape having a straight line and a curved line (for example, a dogleg shape). Or, it may have a U-shaped shape, an arc-shaped shape, a wavy shape, a zigzag shape, or the like). Further, the adhesive sheet may be a single-sided adhesive adhesive sheet.

Further, in the above embodiment, the tab is a quadrangular resin film, but the tab is not limited to this. The tab can be appropriately designed according to the purpose and the like within the range described later. Further, in the above embodiment, the tab is fixed to one end in the longitudinal direction of the adhesive sheet having a band shape, but the tab is not limited to this. The tabs can be provided anywhere the adhesive sheet can be pulled. For example, the tabs may be provided at both ends in the longitudinal direction of the adhesive sheet having a strip shape. The same applies to the first tab film and the second tab film constituting the tab.

Further, 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>
In a tabbed adhesive product, when the tab is fixed to the adhesive sheet by sticking the tab to the adhesive surface of the adhesive sheet, the tab fixing surface of the adhesive sheet before fixing the tab (adhesion scheduled to be adhered to the tab) Surface. Positionally, the adhesive surface at the end of the 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 the present specification, the surface roughness Ra refers to the arithmetic mean surface roughness Ra, and is 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 in a measurement range of 5 mm × 5 mm) using a three-dimensional surface shape measuring device (model “Wyko NT-3300”).

Further, the tab fixing surface of the adhesive sheet preferably exhibits a peel strength of about 1 N / 20 mm or more (a peel strength of 180 degrees against stainless steel sheet) from the viewpoint of adhesion to the tab. The peel strength is preferably 3N / 20 mm or more, more preferably 5N / 20 mm or more (for example, 6N / 20 mm or more, typically 6.5N / 20 mm or more). The peel strength is measured by the following method. Prepare an adhesive sheet cut to a size of 20 mm in width and 100 mm in length. In an environment of 23 ° C. and 50% RH, the adhesive surface of the adhesive sheet (typically a double-sided adhesive sheet) is exposed, and the adhesive surface is placed on the surface of a stainless steel plate (SUS plate) with a 2 kg roller. Reciprocate and crimp. After leaving this in the same environment for 30 minutes, using a tensile tester, the peel strength [N / 20 mm width] under the conditions of a tensile speed of 300 mm / min and a peeling angle of 180 degrees according to JIS Z 0237: 2000. To measure. When the adhesive sheet is a double-sided adhesive sheet, a polyethylene terephthalate (PET) film having a thickness of 25 μm may be attached to the other adhesive surface, and then the adhesive surface to be measured may be pressure-bonded to a SUS plate for measurement. As the tensile tester, a universal tensile compression tester (product name "TG-1kN", manufactured by Minebea) can be used.

Further, the tab fixing surface of the 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.

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

<Pulling out and removing adhesive products with tabs>
The tabbed adhesive product disclosed here is excellent in the ability to remove by pulling out from between objects (pull-out removability). Here, the pull-out removability means an object by exposing the tab of the adhesive product from two objects fixed by sandwiching the adhesive sheet of the adhesive product with a tab, pulling the exposed tab, and pulling out the adhesive sheet. It refers to the ease of removal, such as releasing the fixation (typically joining). The two objects can be two parts of one member. Hereinafter, a more specific description will be given with reference to FIGS. 14 and 15.

FIG. 14 is a schematic side view for explaining one aspect of tensile removal (typically pull-out removal), and FIG. 14A is a diagram showing a state in which tensile removal of a tabbed adhesive product is started. , (B) is a diagram showing a state in which the tab is pulled to remove it, and (c) is a diagram showing a state in which the tensile removal of the tabbed adhesive product is completed. 15 is a schematic top view for explaining one aspect of tensile removal (typically pull-out removal), and FIGS. 15A to 15C are shown in FIGS. 14A to 14C, respectively. It is a corresponding figure.

As shown in FIGS. 14A and 15A, the tabbed adhesive product (double-sided adhesive sheet) 600 joins the adhesive sheet 610 for joining the objects A1 and A2 and the objects A1 and A2. It is provided with a tab 650 that is exposed to the outside when it is used. The object A1 is joined to the object A2 using the adhesive sheet 610. Then, when it is desired to release the joint 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 as to pinch the tab 650 with fingers and pull it out from between the objects A1 and A2. Then, the extensible adhesive sheet 610 begins to stretch, contracts in the direction orthogonal to the pulling direction, and begins to peel off from the objects A1 and A2 (see (b) in FIG. 14 and (b) in FIG. 15). Finally, the entire adhesive region of the adhesive sheet 610 is peeled off, and the extraction of the adhesive sheet 610 from the objects A1 and A2 is completed (see (c) of FIG. 14 and (c) of FIG. 15). The removal of the object A1 joined to the object A2 is also completed at the same time.

<Structure of adhesive sheet>
The pressure-sensitive adhesive sheet constituting the tabbed pressure-sensitive adhesive product disclosed herein is, for example, a base-attached pressure-sensitive adhesive sheet having an pressure-sensitive adhesive layer on at least one surface (preferably both sides) of a film-like base material (support). is there. The concept of an adhesive sheet as used herein may include what is called an adhesive tape, an adhesive label, an adhesive film, or the like. The pressure-sensitive adhesive sheet disclosed herein may be in the form of a roll or in the form of a single leaf. Alternatively, it may be an adhesive sheet in a form further processed into various shapes.

The pressure-sensitive adhesive sheet disclosed herein may have, for example, the 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 (both non-peelable) of the film-like base material 720. The pressure-sensitive adhesive sheet 710 before use has a structure in which each surface (each pressure-sensitive adhesive surface) of the pressure-sensitive adhesive layers 721 and 722 is protected by a release liner (not shown). Alternatively, although not shown, the pressure-sensitive adhesive sheet disclosed herein may be a base-less double-sided pressure-sensitive adhesive sheet consisting of only a pressure-sensitive adhesive layer.

Further, the pressure-sensitive adhesive sheet preferably has a long portion (which may be a strip-shaped portion or a rectangular portion; the same shall apply hereinafter) from the viewpoint of tensile removability. As a result, in the adhesive sheet attached to the adherend, the adhesive sheet can be preferably pulled off from the adherend by grasping and pulling one end of the elongated portion in the longitudinal direction. .. The shape of the elongated portion is typically strip-shaped. 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 an elongated shape.

<Adhesive sheet size, etc.>
When the adhesive sheet disclosed herein has an elongated shape (which may be strip-shaped or rectangular. The same shall apply hereinafter) when used, its width should be about 30 mm or less (for example, 20 mm or less, typically 15 mm or less). Can be configured. For example, when a tabbed adhesive product is used in a portable electronic device, the above width can be preferably adopted. When the pressure-sensitive adhesive sheet has a breaking strength of a predetermined value or more, the width thereof can be set to 10 mm or less (for example, 5 mm or less, further 3 mm or less). Further, from the viewpoint of preventing damage such as tearing during tensile removal, the width of the adhesive sheet is preferably 1 mm or more (for example, 3 mm or more, typically 5 mm or more), and 10 mm or more (for example, 12 mm or more). Is more preferable.

When the pressure-sensitive adhesive sheet disclosed herein has a long shape, the length thereof is preferably 1 cm or more (for example, 3 cm or more, typically 5 cm or more) from the viewpoint of removal workability by tension. Further, from the viewpoint of removal workability, the length of the 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 the release liner) disclosed herein is not particularly limited and is generally in the range of 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 adhesive characteristics and the like. When the total thickness of the adhesive sheet is set to a predetermined value or less, it may be advantageous in terms of thinning, downsizing, weight reduction, resource saving, and the like of the product. In another preferred embodiment, the total thickness of the pressure-sensitive adhesive sheet may be 80 μm or greater (eg, 100 μm or greater, typically 130 μm or greater) and greater than 150 μm (eg, greater than 300 μm, typically greater than 500 μm). You may. An adhesive sheet having such a total thickness can be preferably used for fixing an object to be reattached after being attached to, for example, a wall surface or the like and used for a predetermined period of time.

<Characteristics of adhesive sheet>
The pressure-sensitive adhesive sheet disclosed herein preferably exhibits a shear adhesive force of 0.5 MPa or more. As a result, the adhesive sheet adheres well to the adherend. Since the adhesive sheet exhibiting the adhesive force exhibits a strong stress against a force (that is, a shearing force) that tries to shift the adhesive interface, it can be a highly reliable adhesive means in a usage mode exposed to the shearing 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, but if the shear adhesive force is too high, the tensile removability and the adhesive residue prevention property tend to decrease. Therefore, 5 MPa or less (for example, 3 MPa or less, typically 1. It is preferably 5 MPa or less).

The shear adhesive force can be measured by the method described below. An adhesive sheet (typically a double-sided adhesive sheet) is cut into a size of 20 mm × 20 mm to prepare a measurement sample. In an environment of 23 ° C. and 50% RH, each adhesive surface of the measurement sample is superposed on the surfaces of two stainless steel plates, and a 2 kg roller is reciprocated once for crimping. After leaving this in the same environment for 30 minutes, the shear adhesive force [MPa] is measured using a tensile tester under the conditions of a tensile speed of 300 mm / min and a peeling angle of 0 degrees. Specifically, as shown in FIG. 17, one adhesive surface 800A of the measurement sample 800 is attached to the stainless steel plate 801 and the other adhesive surface 800B of the measurement sample 800 is attached to the stainless steel plate 802 and crimped. This is pulled in the direction of the arrow in FIG. 17 (that is, the shearing direction) at the above-mentioned speed, and the peel strength per 20 mm × 20 mm is measured. The shear adhesive force [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 may be fixed to a stainless steel plate with an adhesive or the like, and the other may be measured in the same manner as described above. As the tensile tester, a universal tensile compression tester (product name "TG-1kN", manufactured by Minebea) can be used.

The pressure-sensitive adhesive sheet disclosed here preferably has an initial pressure A to PC (polycarbonate) of 3N / 20 mm or more. As a result, a sufficient adhesive function can be preferably exhibited with respect to the 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 adherend member can be maintained even when the portable electronic device is dropped. The initial adhesive force A is more preferably 5N / 20 mm or more (for example, 6N / 20 mm or more, typically 6.5N / 20 mm or more). The upper limit of the initial adhesive force A is not particularly limited, but it 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 property. preferable.

The initial adhesive force A can be measured by the following method. Prepare an adhesive sheet cut to a size of 20 mm in width and 100 mm in length. The adhesive surface of the adhesive sheet (typically a double-sided adhesive sheet) is exposed in an environment of 23 ° C. and 50% RH, and the adhesive surface is pressure-bonded to 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, the peel strength [N / 20 mm width] under the conditions of a tensile speed of 300 mm / min and a peeling angle of 180 degrees according to JIS Z 0237: 2000. To measure. When the adhesive sheet is a double-sided adhesive sheet, a polyethylene terephthalate (PET) film having a thickness of 25 μm may be attached to the other adhesive surface, and then the adhesive surface to be measured may be pressure-bonded to a PC plate for measurement. As the tensile tester, a universal tensile compression tester (product name "TG-1kN", manufactured by Minebea) can be used.

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

The tensile peeling stress B can be measured by the following method. A measurement sample is prepared by cutting the adhesive sheet into a size of 20 mm in width and 120 mm in length. In an environment of 23 ° C. and 50% RH, each adhesive surface of the above measurement sample (typically a double-sided adhesive sheet) is overlapped on the surface of two PC plates (30 mm × 100 mm × 2 mm thickness) to obtain 2 kg. The roller is reciprocated once and crimped. 70 mm (that is, 20 mm × 70 mm) from one end of the measurement sample in the longitudinal direction is crimped to each PC plate. After leaving this in the same environment for 30 minutes, two PC plates were fixed to each other using a tensile tester, 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 degrees. ] Is measured. Specifically, as shown in FIG. 18, the adhesive surfaces 800A and 800B of the adhesive sheet measurement sample 800 are bonded to and crimped to two PC plates 811 and 812, respectively. 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 above except that one adhesive surface is fixed to one PC plate. As the tensile tester, a universal tensile compression tester (product name "TG-1kN", manufactured by Minebea) can be used.

In a preferred embodiment, the ratio (B / A) of the tensile peeling stress B [N / 20 mm] to the initial adhesive force A [N / 20 mm] is 3.0 or less. As a result, it is possible to preferably achieve both a sufficient adhesive function at the time of use and excellent tensile removability at the time of removal. The above ratio (B / A) is preferably 2.8 or less (for example, 2.6 or less, typically 2.4 or less). Ideally, the lower the ratio (B / A), the better, 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. As a result, for example, in a configuration exhibiting an adhesive strength of a predetermined value or higher, damage such as tearing is unlikely to occur when the adhesive sheet is removed. It also tends to be excellent in workability. The breaking strength is more preferably 20 MPa or more, still more preferably 30 MPa or more (for example, 45 MPa or more, typically 60 MPa or more). From the viewpoint of elasticity and extensibility of the pressure-sensitive adhesive sheet, the breaking strength is preferably about 100 MPa or less (for example, 80 MPa or less, typically 70 MPa or less).

The breaking strength is measured according to the method for measuring "tensile strength" described in JIS K 7311: 1995. More specifically, the breaking strength can be measured under the condition of a tensile speed of 300 mm / min using a No. 3 dumbbell-shaped test piece (width 5 mm). As the tensile tester, the product name "Autograph AG-10G type tensile tester" manufactured by Shimadzu Corporation can be used. In the test, it is preferable to apply powder to the adhesive surface to remove the influence of the sticky adhesive. The tensile direction in the above test is not particularly limited, but when the pressure-sensitive adhesive sheet has a long shape, it is preferable to match the tensile direction with the longitudinal direction thereof. 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 force [MPa]. As a result, damage such as tearing can be more reliably prevented when the adhesive sheet is pulled and removed.

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

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

The pressure-sensitive adhesive sheet disclosed herein preferably exhibits 100% modulus of less than 10 MPa. By setting the 100% modulus of the pressure-sensitive adhesive sheet to less than a predetermined value, when the pressure-sensitive adhesive sheet is pulled and stretched and deformed to be removed from the adherend, the resistance at the start of pulling is reduced 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 from the viewpoint of sticking workability of the adhesive sheet, it is usually appropriate to set it to 0.5 MPa or more (for example, 1 MPa or more).

100% modulus is measured according to the method of measuring "tensile stress" described in JIS K 7311: 1995. More specifically, it is pulled under the condition of a tensile speed of 300 mm / min using a No. 3 dumbbell-shaped test piece (width 5 mm, marked line spacing 20 mm), and the stress [MPa] when the marked line distance is extended by 100%. ] Is 100% modulus. As the tensile tester, the 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, for example, by selecting the base material type (selecting the blending ratio of the hard component and the soft component, etc.), the molding method, and the like.

In a preferred embodiment, the pressure-sensitive adhesive sheet is suitable to exhibit a tensile recovery rate of greater than 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, damage such as tearing at the time of removing the adhesive sheet can be prevented more highly. This point will be described. For example, when the adhesive sheet is pulled and removed in the shearing direction, it usually takes a certain amount of time depending on the adhesive area and the like. Therefore, the removal work may be interrupted in the middle. In such a case, if the tensile recovery rate of the pressure-sensitive adhesive sheet is not more than a predetermined value, the removal work may be restarted from a state in which the mechanical properties (strength, elasticity, etc.) are lowered due to the tension before the work is interrupted. At that time, the adhesive sheet cannot withstand the tension at the time of resuming the removal work, and is liable to be damaged such as torn. Even when the pressure-sensitive adhesive sheet showing the tensile recovery rate is removed in such a manner that it is interrupted once as described above, the recovery after tension suppresses the deterioration of mechanical properties, 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]
For the adhesive sheet, a tensile test is performed in which the specific section distance L ₀ of the adhesive sheet is stretched by 100%. When the length of the specific section 5 minutes after the adhesive sheet is stretched 100% and then released is L ₁ , the formula: tensile recovery rate (%) = L ₀ / L ₁ × 100; 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 spacing 20 mm) is used to stretch 100% under the condition of a tensile speed of 300 mm / min. In other words, pull until the marked line spacing extends by 20 mm. Then, the length L ₁ (marked line interval: mm) after 5 minutes from 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 the initial marked line spacing of 20 mm. The tensile tester and others are basically the same as in the case of elongation at break described above. The tensile direction in the above test is not particularly limited, but it is preferable to match the tensile direction with the longitudinal direction of the pressure-sensitive adhesive sheet or its long portion. 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 applies hereinafter) is an acrylic polymer known in the field of pressure-sensitive adhesives. , Rubber-based polymer, polyester-based polymer, urethane-based polymer, polyether-based polymer, silicone-based polymer, polyamide-based polymer, fluorine-based polymer, and other various rubber-like polymers are included as a base polymer. obtain. The pressure-sensitive adhesive layer disclosed here is preferably an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer, a rubber-based pressure-sensitive adhesive layer containing a rubber-based polymer as a base polymer, and a urethane-based polymer. Is a urethane-based pressure-sensitive adhesive layer containing the above as a base polymer. Alternatively, the pressure-sensitive adhesive layer may be a combination of an acrylic polymer and a rubber-based polymer as the base polymer.

(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 addition, in this specification, a "base polymer" of a pressure-sensitive adhesive means a main component (typically, a component contained in excess of 50% by weight) of a polymer component contained in the pressure-sensitive adhesive.

As the acrylic polymer, for example, a polymer of a monomer raw material containing an alkyl (meth) acrylate as a main monomer and further containing a submonomer having copolymerizability with the main monomer is preferable. Here, the main monomer means a component that accounts for more than 50% by weight of all the 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. Further, R ² is a chain alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of carbon atoms may be referred to as “C _1-20 ”). From the viewpoint of the storage elastic modulus of the pressure-sensitive adhesive, alkyl (meth) acrylate in which R ² is a chain alkyl group of C _1-14 (for example, C _2-10 , typically C _4-8 ) is preferable, and R Alkyl acrylates in which ¹ is a hydrogen atom and R ² is a chain alkyl group of C _4-8 are 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. (Meta) 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 Examples thereof include (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecil (meth) acrylate, and ecocil (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 viewpoint of adhesive properties and prevention of adhesive residue.

The blending ratio of the main monomer in all the monomer components is preferably 70% by weight or more (for example, 85% by weight or more, typically 90% by weight or more). The upper limit of the blending ratio of the main monomer is not particularly limited, but is preferably 99.5% by weight or less (for example, 99% by weight or less). When C _4-8 alkyl acrylate is used as the monomer component, the proportion of C _4-8 alkyl acrylate in the alkyl (meth) acrylate contained in the monomer component is preferably 70% by weight or more. 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 carried out 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 contain 2EHA in a smaller proportion than BA.

The submonomer having copolymerizability with the main monomer, alkyl (meth) acrylate, can be useful for introducing cross-linking points into the acrylic polymer and enhancing the cohesive force of the acrylic polymer. Examples of the sub-monomer include 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, and an alkoxysilyl group-containing monomer. One or more functional group-containing monomers such as an imide group-containing monomer and an epoxy group-containing monomer can be used. For example, from the viewpoint of improving the cohesive force, an acrylic polymer in which a carboxy group-containing monomer and / or a hydroxyl group-containing monomer is copolymerized 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 both adhesive strength and cohesive strength in a well-balanced manner, it is appropriate that the amount of submonomers is 0.5% by weight or more of the total monomer components of the acrylic polymer, preferably 1% by weight. % Or more. The amount of the submonomer is preferably 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 set in all the 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 approximately 0.1 to 10% by weight (for example, 0.2 to 8% by weight, typically 0.5 to 5% by weight). When the hydroxyl group-containing monomer is copolymerized with the acrylic polymer, the content of the hydroxyl group-containing monomer is approximately 0 in all the monomer components used for the synthesis of the acrylic polymer from the viewpoint of achieving both adhesive strength and cohesive force. It is preferably in the range of 0.01 to 10% by weight (for example, 0.01 to 5% by weight, typically 0.02 to 2% by weight).

The acrylic polymer disclosed herein may be copolymerized with a monomer (other monomer) other than the above as long as the effect of the present invention is not significantly impaired. The other monomers can be used, for example, for the purpose of adjusting the glass transition temperature of the acrylic polymer, adjusting the adhesive performance (for example, peelability), and the like. For example, examples of the monomer capable of improving the cohesive force of the pressure-sensitive adhesive include a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, a cyano group-containing monomer, vinyl esters, and an aromatic vinyl compound. As the above-mentioned other monomers, one kind may be used alone, or two or more kinds may be used in combination. Among them, vinyl esters are mentioned as a preferable example. 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 monomers is approximately 30% by weight or less (typically 0.01 to 30% by weight, for example, 0.1 to 10% by weight) of all the monomer components used in the synthesis of the acrylic polymer. 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 and the like. It is appropriate that it is designed, preferably −25 ° C. or lower (for example, −60 ° C. or higher and −25 ° C. or lower), and 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 the monomers used in the synthesis of the polymer). Here, the Tg of the acrylic polymer is Fox based on the Tg of the homopolymer of each monomer constituting the polymer and the weight fraction (copolymerization ratio based on the weight) of the monomer. The value obtained from the formula of. As shown below, the Fox formula is a relational formula between the Tg of the copolymer and the glass transition temperature Tgi of the homopolymer obtained by homopolymerizing each of the monomers constituting the copolymer.
1 / Tg = Σ (Wi / Tgi)
In the above Fox formula, Tg is the glass transition temperature (unit: K) of the copolymer, Wi is the weight fraction of the monomer i in the copolymer (copolymerization ratio based on the weight), 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 the publicly known material shall be adopted.

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

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

The solvent (polymerization solvent) used for 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 polymerization method. For example, one or more azo polymerization initiators such as 2,2'-azobisisobutyronitrile (AIBN) can be preferably used. Other examples of polymerization initiators include persulfates such as potassium persulfate; peroxide-based initiators such as benzoyl peroxide and hydrogen peroxide; substituted ethane-based initiators such as phenyl-substituted ethane; aromatic carbonyl compounds. ; Etc. can be mentioned. Yet another example of a polymerization initiator is a redox-based initiator in which a peroxide and a reducing agent are combined. Such a polymerization initiator can be used alone or in combination of two or more. 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 the monomer components. You can choose from a range.

The weight average molecular weight of the base polymer (preferably an acrylic polymer) disclosed herein (Mw) of, is not, it may be in the range, for example 10 × 10 ⁴ or more 500 × 10 ⁴ or less particularly limited. From the viewpoint of balancing the cohesive force and the adhesive force at a high level, the Mw of the base polymer (preferably an acrylic polymer) is preferably 10 × 10 ^{4 to} 150 × 10 ⁴ , more preferably 20 × 10 ^{4 to} 110. It is in the range of × 10 ⁴ (for example, 20 × 10 ⁴ to 75 × 10 ⁴ ), more preferably 35 × 10 ^{4 to} 90 × 10 ⁴ (for example, 35 × 10 ^{4 to} 65 × 10 ⁴ ). Here, Mw refers to a standard polystyrene-equivalent value obtained by gel permeation chromatography (GPC). As the GPC apparatus, for example, the 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 made of a rubber-based pressure-sensitive adhesive. The rubber-based pressure-sensitive adhesive according to a more 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, vinyltoluene, vinylxylene and the like. Specific examples of the conjugated diene compound include 1,3-butadiene, isoprene and the like. Such block copolymers can be used alone or in combination of two or more as the base polymer.

In the A segment (hard segment) of the block copolymer, the copolymerization ratio of the monovinyl-substituted aromatic compound (two or more thereof can be used in combination) is 70% by weight or more (more preferably 90% by weight or more). It may be substantially 100% by weight.). In the B segment (soft segment) of the block copolymer, the copolymerization ratio of the conjugated diene compound (two or more thereof can be used in combination) is 70% by weight or more (more preferably 90% by weight or more), which is substantially the same. 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, or the like. In the triblock body and the radial body, it is preferable that the A segment (for example, 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-crosslinked structure and improving the cohesiveness of the pressure-sensitive adhesive. As the block copolymer in the technique disclosed herein, for example, the ratio of the diblock body is 30% by weight or more (more preferably 40% by weight) from the viewpoint of adhesive force (peeling strength) and repulsion resistance to the adherend. As described above, more preferably 50% by weight or more, particularly preferably 60% by weight or more, typically 65% by weight or more, for example 70% by weight or more) can be preferably used. Further, from the viewpoint of resistance to continuously applied stress, those having 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 technique disclosed herein, the base polymer is a styrene-based block copolymer. For example, it can be preferably carried out in an embodiment in which the base polymer contains at least one of a styrene isoprene block copolymer and a styrene butadiene block copolymer. Of the styrene-based 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 ratio of the isoprene block copolymer and the styrene-butadiene block copolymer is preferably 70% by weight or more. In a preferred embodiment, substantially all (eg, 95-100% by weight) of the styrene-based block copolymer is a styrene isoprene block copolymer. In another preferred embodiment, substantially all (eg, 95-100% by weight) of the styrene-based block copolymers are styrene-butadiene block copolymers. According to such a composition, an adhesive sheet having excellent repulsion resistance and a good balance with other adhesive properties can be preferably realized.

The styrene-based block copolymer may be in the form of a diblock body, a triblock body, a radial body, a mixture thereof, or the like. In the triblock body and the radial body, it is preferable that the styrene block is arranged at the end of the polymer chain. This is because the styrene blocks arranged at the ends of the polymer chains are likely to gather to form a styrene domain, thereby forming a pseudo-crosslinked structure and improving the cohesiveness of the pressure-sensitive adhesive. The styrene-based block copolymer used in the technique disclosed herein has, for example, a diblock compound ratio of 30% by weight or more (more preferably) from the viewpoint of adhesive force (peeling strength) and repulsion resistance to the adherend. 40% by weight or more, more preferably 50% by weight or more, particularly preferably 60% by weight or more, typically 65% by weight or more) can be preferably used. A styrene-based block copolymer having a diblock ratio of 70% by weight or more (for example, 75% by weight or more) may be used. Further, from the viewpoint of holding power and the like, a styrene-based block copolymer having a diblock compound 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-based block copolymer having a diblock ratio of 60 to 85% by weight can be preferably adopted.

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

(Urethane polymer)
In still another preferred embodiment, the pressure-sensitive adhesive layer is made of a urethane-based pressure-sensitive adhesive. Here, the urethane-based pressure-sensitive adhesive (layer) refers to a pressure-sensitive adhesive (layer) containing a urethane-based polymer as a base polymer. The urethane-based pressure-sensitive adhesive is typically made of a urethane-based resin containing a urethane-based polymer obtained by reacting a polyol with a polyisocyanate compound as a base polymer. The urethane-based polymer is not particularly limited, and an appropriate urethane-based polymer (ether-based polyurethane, ester-based polyurethane, carbonate-based 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. As a result, both maintenance of the initial adhesive force A and 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 of being exposed on the pressure-sensitive adhesive surface or in a state of being encapsulated in the pressure-sensitive adhesive layer. The filler particles exposed on the adhesive surface reduce the area of the adhesive on the adhesive surface and improve the slipperiness of the adhesive interface in the shear direction. As a result, the tensile peeling stress B is reduced, but the decrease in the pressure-sensitive adhesive area on the adhesive surface also brings about a decrease in the initial adhesive force A. On the other hand, the filler particles existing inside the pressure-sensitive adhesive layer are considered to greatly contribute to the reduction of the tensile peeling stress B without lowering the initial pressure-sensitive adhesive force A. The main reason for this is not particularly limited, but a change in the state of the pressure-sensitive adhesive layer due to deformation of the pressure-sensitive adhesive sheet can be considered. Specifically, since the tensile peeling is a mode in which the adhesive is peeled off in a direction parallel to the adhesive surface (tension peeling direction, also referred to as a shearing direction), the adhesive sheet is deformed in that direction during the tensile peeling. .. The extensible 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 stretchability with respect to tension, the pressure-sensitive adhesive layer is also significantly deformed as the base material is stretched. It is considered that the deformation of the pressure-sensitive adhesive layer increases the amount of the filler particles contained in the pressure-sensitive adhesive layer exposed to the pressure-sensitive adhesive surface and improves the slipperiness in the shearing direction at the bonding interface. It is also considered that the pressure-sensitive adhesive (tacky 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 considered that the difference in the behavior of the pressure-sensitive adhesive and the filler particles with respect to this tensile peeling contributes to the reduction of the tensile peeling stress. It is considered that the above-mentioned changes in the surface state of the pressure-sensitive adhesive layer and the behavior of the components of the pressure-sensitive adhesive layer do not become apparent or can be ignored by, for example, 90-degree peeling or 180-degree peeling due to the difference in the peeling mode. Be done. However, it is typically considered that the stress change is greatly affected during 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 pressure-sensitive adhesive force A and the reduction of the tensile peeling stress B. The effect of containing the filler particles is particularly remarkable in the adhesive sheet having extensibility. Further, in an stretchable pressure-sensitive adhesive sheet having a base material, the mechanical properties of the base material can typically contribute significantly to the adhesive strength (typically 180-degree peel strength), so that the pressure-sensitive adhesive composition (for example, pressure-imparting) is applied. It is considered that the contribution of the agent, the additive component such as the cross-linking agent, etc.) to the adhesive strength is relatively small. In such a pressure-sensitive adhesive sheet, by incorporating filler particles in the pressure-sensitive adhesive layer, an action of selectively reducing only the tensile peeling stress B while maintaining the initial pressure-sensitive adhesive force A is preferably realized.

The type of filler particles used is not particularly limited. For example, particulate or fibrous fillers can be used. The constituent materials of the filler particles (typically particulate fillers) are 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, borosand, zinc borate; silicon carbide, boron carbide, Carbide such as nitrogen carbide and calcium carbide; Nitride such as aluminum nitride, silicon nitride, boron nitride and gallium nitride; Carbonate such as calcium carbonate; Titanate such as barium titanate and potassium titanate; Carbon black, carbon tube (Carbon nanotubes), carbon fibers, carbon-based substances such as diamond; glass; inorganic materials such as; polystyrene, acrylic resin (for example, polymethylmethacrylate), phenol resin, benzoguanamine resin, urea resin, silicone resin, polyester, polyurethane, polyethylene , Polypropylene, polyamide (eg, nylon, etc.), polyimide, polymers such as polyvinylidene chloride; etc. Alternatively, natural raw material particles such as volcanic shirasu, clay, and sand may be used. As the fibrous filler, various synthetic fiber materials and natural fiber materials can be used. These can be used alone or in combination of two or more. Among them, a particulate filler is preferable from the viewpoint of reducing tensile peeling stress, and among them, a particulate filler composed of an inorganic material (for example, aluminum hydroxide) is preferably used.

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 has a particle size smaller than the thickness of the pressure-sensitive adhesive layer. As a result, the adhesive surface tends to maintain a good surface state, and the desired adhesive characteristics (for example, initial adhesive force A) can be preferably exhibited. In addition, the appearance of the surface of the pressure-sensitive adhesive layer tends to be maintained well. 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 size smaller than the thickness of the pressure-sensitive adhesive layer. .. It is more preferable that substantially the total 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 condition of the pressure-sensitive adhesive surface. However, it has a particle size smaller than 2/3 (that is, 2/3 T, more preferably 1/2, that is, 1 / 2T) of the thickness T of the pressure-sensitive adhesive layer. In addition, when X% by weight or more of the filler particles has a particle size smaller than Y, the cumulative particle size (weight standard) up to the particle size Y (μm) in the particle size distribution obtained by the measurement based on the sieving method is X (weight basis). It means that it is less than% by weight). The proportion (% by weight) of the filler particles having a predetermined particle size can be determined based on the particle size distribution.

In a preferred embodiment, the filler particles contained in the pressure-sensitive adhesive layer are 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. The pressure-sensitive adhesive layer containing such filler particles is advantageous in terms of maintaining adhesive strength and appearance, because the smoothness of the adhesive surface is not easily impaired even if the content of the filler particles is relatively large. The filler particles contained in the pressure-sensitive adhesive layer are 50% by weight or more (for example, 70% by weight or more, typically 80% by weight or more) of particles having a particle size of less than 20 μm (for example, less than 15 μm, typically less than 10 μm). It is more preferable to occupy.

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

The average particle size of the entire filler particles contained in the pressure-sensitive adhesive layer is usually preferably 0.5 μm or more, preferably 0.8 μm or more (for example, 3 μm or more, typically 5 μm or more). As the average particle size increases, the tensile peeling stress reducing effect tends to improve, and the tensile peeling stress B can be efficiently reduced by adding a small amount of filler particles. It is also preferable to make the average particle size more than a predetermined value from the viewpoint of maintaining good viscosity and dispersibility of the composition. The upper limit of the average particle size is usually preferably 50 μm or less, preferably 30 μm or less, more preferably 25 μm or less, still more preferably 15 μm or less. When the average particle size becomes smaller, the deterioration of 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 means the particle size (50% median diameter) at which the cumulative particle size based on the 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 layered shape, or the like. The concept of bulk shape includes, for example, spherical shape, rectangular parallelepiped shape, crushed shape or a variant 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 from the viewpoint of reducing tensile peel stress, less than about 100 is suitable, preferably less than 50, more preferably less than 10 (for example, less than 5, typically less than 2). Can be. Here, the average aspect ratio of the filler particles is obtained as the average value of the aspect ratios of the particles represented by the major axis / minor axis of the filler particles. The major axis typically refers to the maximum transfer length of the particles to be measured, and the minor axis typically refers to the minimum transfer 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, it is appropriate that the content C of the filler particles in the pressure-sensitive adhesive layer is 30% by volume or less. By appropriately adjusting the particle size and content of the filler particles, it is possible to preferably reduce the tensile peeling stress B while suppressing the decrease in the initial adhesive force A. The content C of the filler particles in the pressure-sensitive adhesive layer is preferably 25% by volume or less, more preferably 20% by volume or less (for example, 16% by volume or less, typically 14% by volume or less). Further, from the viewpoint of reducing tensile peel stress, the content C is preferably 0.3% by volume or more, preferably 2% by volume or more, and more preferably 3% by volume or more (for example, 5 volumes). % Or more, typically 10% by volume or more). Since the technique 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. It may not be contained as a target, or the above-mentioned dispersant may be contained. The content C [volume%] of the filler particles is determined based on the weight ratio and density of the components other than the filler particles (typically, the pressure-sensitive component) in the pressure-sensitive adhesive layer and the weight ratio and density of the filler particles. For example, by adopting 2.42 g / cm ³ as the density of aluminum hydroxide, the content C [volume%] of the filler particles in the pressure-sensitive adhesive layer can be determined.

When the pressure-sensitive adhesive layer contains filler particles, the content of the filler particles (for example, inorganic material particles, typically metal oxide or metal hydroxide) in the pressure-sensitive adhesive layer is 100 weight based on the weight of the base polymer. It is appropriate that the amount is less than 100 parts by weight. By appropriately adjusting the particle size and content of the filler particles, it is possible to preferably reduce the tensile peeling stress B while suppressing the decrease in the initial adhesive force A. The content of the filler particles in the pressure-sensitive adhesive layer is preferably 80 parts by weight or less, more preferably 60 parts by weight or less (for example, 45 parts by weight or less, typically 35 parts by weight or less) with respect to 100 parts by weight of the base polymer. ). From the viewpoint of reducing tensile peel stress, the content is preferably 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. 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 where the pressure-sensitive adhesive composition is cured by active energy ray irradiation (for example, UV irradiation), the acrylic oligomer is more curing-inhibited (for example, not yet) than the tack-imparting resin such as rosin-based or terpene-based. It has the advantage that it does not easily cause polymerization inhibition of the reaction monomer. The acrylic oligomer is a polymer containing an acrylic monomer as a constituent monomer component thereof, and is defined as a polymer having a smaller Mw than the acrylic polymer.

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

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

As the chain alkyl (meth) acrylate, an alkyl (meth) acrylate in which R ² is C _1-12 (for example, C _1-8 ) in the above formula (1) is preferably used. 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.

A preferred example of the functional group-containing monomer is a monomer having a nitrogen atom-containing ring (typically a nitrogen atom-containing heterocycle) such as N-vinyl-2-pyrrolidone and N-acryloylmorpholin; 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.

The alicyclic hydrocarbon group-containing (meth) acrylate is, for example, one kind of alicyclic hydrocarbon group-containing (meth) acrylate in which the number of carbon atoms of the alicyclic hydrocarbon group is in the range of 4 to 20. Alternatively, two or more 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 ratio (that is, copolymerization ratio) of the alicyclic hydrocarbon group-containing (meth) acrylate to all the monomer components constituting the acrylic oligomer is about 30 to 90% by weight (that is, the copolymerization ratio) from the viewpoint of adhesiveness and cohesiveness. For example, it is preferably 50 to 80% by weight, typically 55 to 70% by weight).

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

When the acrylic oligomer is a copolymer of a monomer mixture containing a chain alkyl (meth) acrylate and an alicyclic hydrocarbon group-containing (meth) acrylate, the chain alkyl (meth) acrylate and the alicyclic hydrocarbon The ratio with the group-containing (meth) acrylate is not particularly limited. In 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: 8-7: 3 (e.g., 3: 7-6: 4, typically 3: 7-5: 5) Is.

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

The Mw of the acrylic oligomer is not particularly limited, but is typically about 0.1 × 10 ^{4 to} 3 × 10 ⁴ . From the viewpoint of improving the adhesive properties (for example, adhesive strength and repulsion resistance), the Mw of the acrylic oligomer is preferably 1.5 × 10 ⁴ or less, more preferably 1 × 10 ⁴ or less, and 0.8 × 10 ⁴ or less. (e.g. 0.6 × 10 ⁴ or less) are more preferred. From the viewpoint of cohesiveness, etc. of the adhesive, the Mw is, 0.2 × 10 ⁴ or more (e.g., 0.3 × 10 ⁴ or more) are preferred. The molecular weight of the acrylic oligomer can be adjusted by using a chain transfer agent or the like, if necessary, during polymerization.

Acrylic oligomers can be formed by polymerizing their 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 adopted in an appropriate manner. Since the types and amounts of polymerization initiators (for example, azo-based polymerization initiators such as AIBN) that can be used as needed are generally as described above, the description will not be repeated here.

It is appropriate that the content of the acrylic oligomer in the pressure-sensitive adhesive composition disclosed herein is, for example, 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 (for example, 1.5 parts by weight or more, typically 2 parts by weight or more). .. Further, from the viewpoint of curability of the pressure-sensitive adhesive composition and compatibility with the acrylic polymer, it is appropriate that the content of the acrylic oligomer is less than 50 parts by weight (for example, less than 10 parts by weight). It is preferably less than 8 parts by weight (for example, less than 7 parts by weight, typically 5 parts by weight or less). Even with such a small amount of addition, improvement in impact resistance and repulsion resistance by using an acrylic oligomer can be realized.

(Adhesive agent)
The pressure-sensitive adhesive layer disclosed herein may have a composition containing a pressure-sensitive adhesive. The tackifier is not particularly limited, and for example, a rosin-based tackifier resin, a terpene-based tackifier resin, a hydrocarbon-based tackifier resin, an epoxy-based tackifier resin, a polyamide-based tackifier resin, an elastomer-based tackifier resin, Various tackifier resins such as phenol-based tackifier resins and ketone-based tackifier resins can be used. As such a tackifier resin, one type can be used alone or two or more types can be used in combination.

Specific examples of the rosin-based tackifier resin include unmodified rosins (raw rosins) such as gum rosin, wood rosin, and tall oil rosin; modified rosins obtained by modifying these unmodified rosins by hydrogenation, disproportionation, polymerization, etc. Hydrogenated rosin, disproportionated rosin, polymerized rosin, other chemically modified rosin, etc. The same shall apply hereinafter); Other various rosin derivatives; etc. Examples of the above-mentioned rosin derivatives include rosins obtained by esterifying unmodified rosin with alcohols (that is, esterified rosin) and esterifying modified rosin with alcohols (that is, esterified rosin). Esters; Unmodified rosins and unsaturated fatty acid-modified rosins obtained by modifying modified rosins with unsaturated fatty acids; Unsaturated fatty acid-modified rosin esters modified from rosin esters with unsaturated fatty acids; Unmodified rosins, modified rosins, unsaturated Rosin alcohols obtained by reducing the carboxy group in fatty acid-modified rosins or unsaturated fatty acid-modified rosin esters; metal salts of rosins (particularly rosin esters) such as unmodified rosins, modified rosins, and various rosin derivatives; rosins. Examples thereof include a rosin phenol resin obtained by adding phenol to (unmodified rosin, modified rosin, various rosin derivatives, etc.) with an acid catalyst and thermally polymerizing the mixture. When an acrylic polymer is used as the base polymer, it is preferable to use a rosin-based tackifier resin. From the viewpoint of improving adhesive properties such as adhesive strength, one of the above rosin-based tackifying resins may be selected alone, or two or three or more having different types and characteristics (for example, softening points) may be used in combination. It is more preferable to do so.

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

Examples of hydrocarbon-based tackifier resins include aliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aliphatic / aromatic petroleum resins (styrene-olefin copolymers, etc.) ), Various hydrocarbon-based resins such as aliphatic / alicyclic petroleum resins, hydrogenated hydrocarbon resins, kumaron-based resins, and kumaron-inden-based resins.

In the technique disclosed herein, as the tackifier resin, 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. According to the pressure-sensitive adhesive containing the pressure-sensitive adhesive resin having a softening point equal to or higher than the above-mentioned lower limit value, a pressure-sensitive adhesive sheet having more excellent adhesive strength can be realized. Among the tackifier resins exemplified above, a terpene-based tackifier resin having the above softening point (for example, a terpene-modified phenol resin), a rosin-based tackifier resin (for example, an esterified product of a polymerized rosin) and the like can be preferably used. The upper limit of the softening point of the tackifier resin is not particularly limited, and can be, for example, about 200 ° C. or lower (typically about 180 ° C. or lower). The softening point of the tackifier resin referred to here is defined as a value measured by the softening point test method (ring ball method) specified in any of JIS K 5902 and JIS K 2207.

The amount of the tackifier used is not particularly limited, and can be appropriately set according to the desired adhesive performance (adhesive strength, etc.). For example, based on the solid content, the tackifier is used in 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. It is preferable to do so. The technique disclosed herein may be carried out in the form of providing a pressure-sensitive adhesive layer substantially free of the pressure-sensitive adhesive.

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 the tackifying resin. The pressure-sensitive adhesive sheet of this aspect is preferable from the viewpoint of repulsion resistance, holding power and the like. In a preferred embodiment, the high softening point resin may include a tackifier resin having a softening point of 125 ° C. or higher (more preferably 130 ° C. or higher, still 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 preferably 200 ° C. or lower, preferably 180 ° C. or lower, more preferably 170 ° C. or lower (for example, 160 ° C. or lower). ).

As the high softening point resin, a terpene phenol resin, a polymerized rosin, an esterified product of the polymerized rosin and the like can be preferably adopted. As these high softening point resins, one type can be used alone, or two or more types can be used in combination as appropriate. As a preferred embodiment, there is an embodiment in which the high softening point resin contains one kind or two or more kinds of 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, for example, 125 ° C. or higher and 170 ° C. or lower) can be preferably adopted.

The terpene phenol resin preferably has 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). 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 the potentiometric titration method specified in JIS K 0070: 1992 can be adopted. As a specific measurement method, the method described in JP-A-2014-55235 is adopted.

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

From the viewpoint of repulsion resistance, holding power, etc., the content of the high softening point resin can be, for example, 20 parts by weight or more, and 30 parts by weight or more (for example, 35 parts by weight or more) with respect to 100 parts by weight of the base polymer. ) Is preferable. From the viewpoint of adhesive strength, low temperature characteristics, etc., the content of the high softening point resin with respect to 100 parts by weight of the base polymer is usually preferably 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 technique disclosed herein is an embodiment in which the rubber-based pressure-sensitive adhesive contains a low softening point resin having a softening point of less than 120 ° C. in place of the high softening point resin or in addition to the high softening point resin. Can be carried out. As a preferred embodiment, the rubber-based pressure-sensitive adhesive contains a high softening point resin having a softening point of 120 ° C. or higher and a low softening point resin having a softening point of less than 120 ° C.

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

The technique disclosed herein can be preferably carried out in a manner in which the rubber-based pressure-sensitive adhesive contains at least one of a petroleum resin and a terpene resin (typically an unmodified terpene resin) as the low softening point resin. For example, the main component of the low softening point resin (that is, the component accounting for more than 50% by weight of the low softening point resin) is a composition of petroleum resin, a composition of terpene resin, or a combination of petroleum resin and terpene resin. A certain composition, etc. can be preferably adopted. From the viewpoint of adhesive strength and compatibility, it is preferable that the main component of the low softening point resin is a terpene resin (for example, β-pinene polymer). 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 tackifier resin having a hydroxyl value of 0 or more and less than 80 mgKOH / g (low hydroxyl value tackifier resin). As the low hydroxyl value tackifier resin, among the various tackifier resins described above, those having a hydroxyl value in the above range can be used alone or in combination as appropriate. For example, a terpene phenol resin having a hydroxyl value of 0 or more and less than 80 mgKOH / g, a petroleum resin (for example, C5-based petroleum resin), a terpene resin (for example, β-pinene polymer), a rosin-based resin (for example, polymerized rosin), and rosin. A derivative resin (for example, an 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. (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, and more preferably 70 parts by weight or less (for example, 60 parts by weight). (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 tackifier resin contains a low softening point resin and a high softening point resin, the relationship between the amounts used thereof is such that the weight ratio of the low softening point resin: the high softening point resin is 1: 5 to 3: 1 (more preferable). Is preferably set to 1: 5 to 2: 1). The technique disclosed herein is an embodiment in which the rubber-based pressure-sensitive adhesive contains a larger amount of a high softening point resin than a low softening point resin as a tackifier resin (for example, a weight ratio of a low softening point resin: a high softening point resin is 1). : 1.2 to 1: 5) can be preferably carried out. According to such an aspect, a higher performance adhesive sheet can be realized.

In the technique disclosed herein, the content of the tackifier resin with respect to 100 parts by weight of the base polymer (typically a rubber-based polymer) is usually 20 parts by weight or more, preferably 30 parts by weight. The above is more preferably 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), it is usually appropriate that the content of the tackifier resin with respect to 100 parts by weight of the base polymer is 200 parts by weight or less. It is preferably 150 parts by weight or less. The content of the tackifier resin with respect 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 to form the pressure-sensitive adhesive layer disclosed herein may contain a cross-linking agent, if necessary. The type of the cross-linking agent is not particularly limited, and a conventionally known cross-linking agent can be appropriately selected and used. Examples of such a cross-linking agent include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, metal chelate-based cross-linking agents and the like. Be done. The cross-linking agent may be used alone or in combination of two or more. Among them, from the viewpoint of improving the cohesive force, it is preferable to use an isocyanate-based cross-linking agent and an epoxy-based cross-linking agent, and an isocyanate-based cross-linking agent is more preferable.

The amount of the cross-linking 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 0.01 parts by weight) with respect to 100 parts by weight of the base polymer (for example, acrylic polymer). It can be selected from the range of 5 parts by weight). Since the technique disclosed herein can achieve the desired tensile peeling stress B without reducing the amount of the cross-linking agent used, the amount of the cross-linking agent used is approximately 0 with respect to 100 parts by weight of the acrylic polymer. It may be 1 part by weight or more (for example, 0.8 parts by weight or more, typically 1.2 parts by weight or more). From the viewpoint of limiting the cohesive force and reducing the tensile peeling stress B, the amount of the cross-linking agent used is about 5 parts by weight or less (for example, 3 parts by weight or less, typically 3 parts by weight or less) with respect to 100 parts by weight of the acrylic polymer. May be 2 parts by weight or less).

(Other ingredients)
The pressure-sensitive adhesive composition may be a leveling agent, a cross-linking aid, a plasticizer, a softening agent, a colorant (dye, pigment), an antistatic agent, an antioxidant, an ultraviolet absorber, an antioxidant, and light, if necessary. It may contain various additives that are common in the field of pressure-sensitive adhesive compositions, such as stabilizers and dispersants. Further, for example, an adhesive force adjusting agent such as a silicone-based oligomer may be added to the pressure-sensitive adhesive composition (typically an acrylic pressure-sensitive adhesive composition). As for such various additives, conventionally known ones can be used by a conventional method and do not particularly characterize the present invention, and thus detailed description thereof will be omitted.

(Adhesive composition)
The pressure-sensitive adhesive layer disclosed herein may be a pressure-sensitive adhesive layer formed from a water-based pressure-sensitive adhesive composition, a solvent-type pressure-sensitive adhesive composition, a hot-melt type pressure-sensitive adhesive composition, and an active energy ray-curable pressure-sensitive adhesive composition. .. The water-based pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in which a pressure-sensitive adhesive (sticking agent layer-forming component) is contained in a solvent containing water as a main component (water-based solvent), and is typically water-dispersed. 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. Further, the solvent-type pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in the form of containing a pressure-sensitive adhesive in an organic solvent. The technique disclosed herein is preferably carried out in a mode in which a pressure-sensitive adhesive layer formed from a solvent-type pressure-sensitive adhesive composition is provided from the viewpoint of preferably realizing adhesive properties such as adhesive strength.

(Method of forming the 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 adopted. 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 adopted. Further, a method (transfer) in which a pressure-sensitive adhesive composition is applied to a peelable surface (peeling surface) and dried to form a pressure-sensitive adhesive layer on the surface, and the pressure-sensitive adhesive layer is transferred to a film-like substrate (transfer). Law) may be adopted. As the peeling surface, the surface of the peeling liner, the back surface of the base material that has been peeled off, 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, and may have a regular or random pattern such as a dot shape or a striped shape. It may be a formed pressure-sensitive adhesive layer.

The pressure-sensitive adhesive composition can be applied by 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, a curtain coating method, or the like. Further, the drying of the pressure-sensitive adhesive composition is preferably carried out under heating from the viewpoint of promoting the cross-linking reaction and improving the production efficiency. The drying temperature can be, for example, about 40 to 150 ° C. (preferably about 60 to 130 ° C.). After the pressure-sensitive adhesive composition is dried, even if aging is performed for the purpose of adjusting the component transfer in the pressure-sensitive adhesive layer, proceeding with the cross-linking reaction, alleviating the strain that may exist in the base material or the pressure-sensitive adhesive layer, etc. Good.

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

<Film-like base material>
The film-like base material disclosed herein preferably exhibits a breaking strength of 10 MPa or more. By using the film-like base material exhibiting the above-mentioned breaking strength, the pressure-sensitive adhesive sheet is less likely to be torn, and excellent tensile removability can be exhibited. According to the film-like substrate exhibiting the breaking strength, the 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). From the viewpoint of elasticity and extensibility of the film-like base material, the breaking strength is preferably about 100 MPa or less (for example, 90 MPa or less, typically 80 MPa or less). The breaking strength is measured by the same method as in the case of the adhesive sheet. The breaking strength of the base material can be adjusted, for example, by selecting the base material type (selecting the blending ratio of the hard component and the soft component, etc.), 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 elongation at break stretches with respect to tension when the pressure-sensitive adhesive sheet is removed. Due to this elongation, 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 to further improve the tensile removability (particularly shear removability) of the pressure-sensitive adhesive sheet. The elongation at break is more preferably 500% or more (for example, 700% or more, typically 800% or more). The upper limit of the elongation at break is not particularly limited, but may be, for example, about 1000% or less (typically 900% or less) from the viewpoint of removal workability and the like. The elongation at break is measured by the same method as in the case of the adhesive sheet.

It is appropriate that the film-like substrate disclosed here 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, damage such as tearing at the time of removing the adhesive sheet can be prevented more highly. The tensile recovery rate is measured by the same method as the method for measuring the tensile recovery rate of the pressure-sensitive adhesive sheet. The tensile recovery rate of the base material can be adjusted, for example, by selecting the base material type (selection of the blending ratio of the hard component and the soft component, etc.), the molding method, and the like.

The film-like substrate disclosed herein preferably exhibits a 5% modulus of less than 10 MPa. By setting the 5% modulus of the film-like substrate to less than a predetermined value, when the adhesive sheet is pulled and stretched and deformed to be removed from the adherend, the resistance at the start of pulling is reduced and the tensile removability tends to be excellent. is there. The 5% modulus is more preferably less than 5 MPa (eg less than 3 MPa, typically less than 2 MPa). The lower limit of the 5% modulus is not particularly limited, but from the viewpoint of sticking workability of the adhesive sheet, it is usually appropriate to set it to 0.5 MPa or more (for example, 1 MPa or more). The 5% modulus is measured according to the method of measuring "tensile stress" described in JIS K 7311: 1995. More specifically, the stress [MPa] when the No. 3 dumbbell-shaped test piece (width 5 mm, marked line spacing 20 mm) is pulled under the condition of a tensile speed of 300 mm / min and the marked line distance is extended by 5%. ] Is 5% modulus. As the tensile tester, the 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 (selection of the blending ratio of the hard component and the soft component, etc.), the molding method, and the like.

The film-like substrate disclosed herein preferably exhibits 100% modulus of less than 10 MPa. By setting the 100% modulus of the film-like substrate to less than a predetermined value, when the adhesive sheet is pulled and stretched and deformed to be removed from the adherend, the resistance at the start of pulling is reduced 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 from the viewpoint of sticking workability of the adhesive sheet, it is usually appropriate to set it to 0.5 MPa or more (for example, 1 MPa or more). The 100% modulus is measured by the same method as for the adhesive sheet.

The film-like substrate disclosed herein preferably exhibits a 150% modulus of less than 20 MPa. By setting the 150% modulus of the film-like base material to less than a predetermined value, the resistance during the tensile removal operation tends to decrease when the pressure-sensitive adhesive sheet is pulled and stretched and deformed to be removed from the adherend. The 150% modulus is more preferably less than 15 MPa (eg less than 12 MPa, typically less than 8 MPa). The lower limit of the 150% modulus is not particularly limited, but from the viewpoint of sticking workability of the adhesive sheet, it is usually appropriate to set it to 1 MPa or more (for example, 5 MPa or more). The 150% modulus is measured according to the "tensile stress" measuring method described in JIS K 7311: 1995. More specifically, the stress [MPa] when the No. 3 dumbbell-shaped test piece (width 5 mm, marked line spacing 20 mm) is pulled under the condition of a tensile speed of 300 mm / min and the marked line distance is extended by 150%. ] Is 150% modulus. As the tensile tester, the 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 (selection of the blending ratio of the hard component and the soft component, etc.), the molding method, and the like.

As the film-like base material (supporting base material) for supporting (lining) the pressure-sensitive adhesive layer, various film-like base materials can be used. As the base material, for example, a woven fabric film, a non-woven fabric film, or a resin film can be used. Of these, a resin film is preferable. The resin film may be a non-foaming resin film, a rubber-like film, a foam film, or the like. Of these, non-foaming resin films and rubber-like films are preferable, and non-foaming resin films are more preferable. The non-foamed resin film has substantially no bubbles (voids) 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. The non-foamed resin film is also excellent in terms of workability, dimensional stability, thickness accuracy, economy (cost), and the like.
The "resin film" in the present specification is a substantially non-porous film, and is a concept that is distinguished from so-called non-woven fabrics and woven fabrics (that is, a concept excluding non-woven fabrics and woven fabrics). Further, the non-foaming resin film refers to a resin film that has not been intentionally treated to form a foam. Specifically, the non-foamed resin film can be a resin film having a foaming ratio of less than 1.1 times (for example, less than 1.05 times, typically less than 1.01 times). The non-foamed resin film includes, for example, a soft resin film called soft polyolefin, soft polyurethane, soft polyester, soft polyvinyl chloride and the like.

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

In a preferred embodiment, the film-like substrate is a polyurethane-based resin film. Here, the polyurethane-based resin film refers to a resin film containing polyurethane as the main component of the resin component (the component having the highest blending ratio, typically a component contained in excess of 50% by weight; the same applies hereinafter). .. A polyurethane-based resin film is typically composed of a material that does not substantially exhibit a yield point, and is a film material that easily realizes an adhesive sheet that exhibits a predetermined breaking strength and elongation, and if necessary, a tensile recovery rate. Is. The polyurethane-based resin film can also realize good physical properties without adding an additive component such as a plasticizer, and thus is also a preferable group in the technique disclosed herein in terms of preventing bleeding out of the additive component. Can be a material.

The proportion of polyurethane in the resin component contained in the polyurethane-based 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 resins. The other resin may be one or more, for example, an acrylic resin, a polyolefin, a polyester, a polycarbonate, or the like. Alternatively, the technique disclosed herein can also be carried out in an embodiment using a base material that substantially does not contain a resin component other than polyurethane.

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

Examples of the polyol that can be used in 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, 1,8-octanediols, polyoxytetramethylene glycols, diethylene glycols, polyethylene glycols, polypropylene glycols and other diols; polyesters that are polycondensates of the above diols and 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 synthesizing the polyurethane include aromatic, aliphatic, and alicyclic diisocyanates, and multimers (for example, dimersions and trimers) of these diisocyanates. Examples of the diisocyanate include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and 1,3-phenylenedi isocyanate. , 1,4-phenylenediocyanate, 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 (isocyanatemethyl) cyclohexane, methylcyclohexanediisocyanate, m-tetramethylxylylene diisocyanate and the like. These can be used alone or in combination of two or more. Of these, aromatic diisocyanates are preferable.

In addition to the polyol and polyisocyanate, other copolymerization components may be introduced into the polyurethane. As the other copolymerization component, one or more of monocarboxylic acid, dicarboxylic acid, trifunctional or higher polycarboxylic acid, hydroxycarboxylic acid, alkoxycarboxylic acid, derivatives thereof and the like can be used. It is appropriate that the proportion of these other copolymerization components is less than 30% by weight (for example, less than 10% by weight, typically less than 5% by weight) in polyurethane. The technique disclosed herein can also be preferably carried out in an embodiment including a polyurethane-based resin film base material containing a polyurethane as a main component which does not contain 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, the 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 particular limitation. Urethane (meth) acrylate may be used alone or in combination of two or more. Urethane (meth) acrylates preferably have two or more urethane bonds and two or more (meth) acryloyl groups. The number of (meth) acryloyl groups contained in the urethane (meth) acrylate is preferably 2 to 5, more preferably 2 to 3. For example, urethane (meth) acrylate having two (meth) acryloyl groups may be preferably used. Further, the urethane (meth) acrylate is preferably urethane acrylate. Here, the "urethane acrylate" refers to those in which the number ratio of acryloyl groups exceeds 50% among the (meth) acryloyl groups contained in the urethane (meth) acrylate.

As the 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., and the like can be preferably used.

In another preferred embodiment, the film-like substrate is a PVC-based 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. Here, the PVC-based 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-based resin (typically PVC). It is preferable that about 80% by weight or more (more preferably about 90% by weight or more) of the total amount of the resin component contained in the PVC-based resin composition is the PVC-based resin. Substantially the total amount of the resin component may be PVC. According to such a PVC-based resin composition, a PVC-based resin film exhibiting physical properties suitable as a base material for an adhesive sheet can be formed.

For film-like base materials (for example, resin film base materials), fillers (inorganic fillers, organic fillers, etc.), colorants (pigments, dyes), antioxidants, antioxidants, and ultraviolet absorbers are used, if necessary. Various additives such as agents, antistatic agents, lubricants, plasticizers, stabilizers and the like may be blended. For example, when a soft PVC resin film is used as the film-like base material, the blending amount of the plasticizer is about 20 to 100 parts by weight (more preferably about 30 to 70 parts by weight) per 100 parts by weight of the PVC resin. Is appropriate. The blending ratio of the various additives is usually less than 30% by weight (for example, less than 20% by weight, typically less than 10% by weight).

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 an undercoat agent. Such a surface treatment may be a treatment for improving the adhesion between the film-like base material and the pressure-sensitive adhesive layer, in other words, the anchoring property of the pressure-sensitive adhesive layer on the base material. When the film-like base material is a polyurethane-based resin film, good anchoring property can be obtained even if the above-mentioned surface treatment is not applied due to its high surface energy.

The film-like base material may have a single-layer structure, or may have a multi-layer structure of two layers, three layers or more. In the case of a multi-layer structure, it is preferable that at least one layer (preferably all layers) is a layer having a continuous structure of the resin (more preferably polyurethane). The method for producing the film-like base material is not particularly limited as long as a conventionally known method may be appropriately adopted. When a resin film base material is used as the film-like base material, it is produced by appropriately adopting a conventionally known general film molding method such as extrusion molding, inflation molding, T die casting molding, or calendar roll molding. A resin film base material can be used.

The thickness of the film-like base material is not particularly limited, and can be appropriately selected depending on the intended purpose. Usually, it is suitable to be 10 μm or more, and 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 not easily torn and can be excellent in tensile removability. It is appropriate that the thickness of the film-like substrate is 3 mm or less (for example, 2 mm or less, typically 1.5 mm or less). The thickness of the film-like base material is preferably 300 μm or less, more preferably 200 μm or less (for example, 150 μm or less, typically 120 μm or less). For example, the above thickness is preferably adopted for a non-foamed resin film base material. According to the technique 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 value. Further, reducing the thickness of the film-like base material is advantageous in terms of thinning, downsizing, weight reduction, resource saving, and the like of the adhesive sheet.

<Peeling liner>
As the release liner, a conventional release paper or the like can be used, and the release liner is not particularly limited. For example, it is made of a release liner having a release treatment layer on the surface of a liner base material such as a resin film or paper, or a low adhesive material of a fluorine-based polymer (polytetrafluoroethylene, etc.) or a polyolefin-based resin (polyethylene, polypropylene, etc.). A release liner or the like can be used. The peeling treatment layer may be formed by surface-treating the liner base material with a peeling treatment agent such as silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide.

<Tab>
As described above, the tabs disclosed here are not limited in shape, material, etc. as long as they perform their functions. The tab basically has a planar shape, and when viewed from above, the tab functions as a tab, such as a triangular shape, a circular shape, an elliptical shape, a semicircular shape, a semicircular shape, or a strip shape. Various shapes can be adopted within the range of exertion. The tab according to a preferred embodiment is a rectangular resin film. The material of the tab may also be a material having rigidity that can withstand pulling when the adhesive sheet is removed. For example, a material exemplified as the material of the above-mentioned film-like base material (for example, a resin film such as PET film, a non-woven fabric, or a woven fabric). An appropriate one can be selected from the cloth, etc.).

Further, it is preferable that the tab exhibits a breaking strength of 10 MPa or more. This prevents damage such as tearing of the tab when the adhesive sheet is removed. It also tends to be excellent in workability. The breaking strength is more preferably 20 MPa or more, still more preferably 30 MPa or more (for example, 45 MPa or more, typically 60 MPa or more). The breaking strength is measured by the above method.

At least one of the outer surfaces of the tab (at least one (preferably both) of the front and back surfaces) is typically non-sticky, at least non-sticky. It is preferable to have. Specifically, the outer surface of the tab may exhibit a peel strength of less than 1N / 20 mm (stainless steel sheet 180 degree peel strength). The peel strength is measured by the method described above. In the present specification, a surface having a peel strength of less than 1N / 20 mm (typically, the outer surface of the tab) is referred to as “non-adhesive”. In addition, 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 compared with the surface (adhesive surface) of the adhesive sheet that constitutes the adhesive product with the tab together with the tab. Degree peel strength) is low. Tabs are typically non-adhesive on both sides of their outer surface, but may be non-adhesive on one side and hypo-adhesive on the other.

The thickness of the tab is not particularly limited, but it is preferable to have a thickness equal to or greater than a predetermined value in order to provide strength to the extent that the adhesive sheet is not torn when pulled. The thickness of the tab is usually preferably 10 μm or more, and preferably about 30 μm or more (for example, 40 μm or more, typically 70 μm or more). Further, the thickness of the tab is preferably 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, and 200 μm or less (for example, 150 μm). Hereinafter, it is more preferably 120 μm or less).

<Use>
The tabbed adhesive products disclosed herein are not particularly limited, and are, for example, metal materials such as stainless steel (SUS) and aluminum; inorganic materials such as glass and ceramics; nylon, polycarbonate (PC), and polymethyl methacrylate (PMMA). ), Polypropylene, polyethylene terephthalate (PET) and other resin materials; natural rubber, butyl rubber and other rubber materials; and composite materials thereof, which can be used by being attached to an adherend having a surface.

The tabbed adhesive product disclosed herein can be smoothly peeled off from an adherend (typically, peeled off by pulling). Taking advantage of this feature, it is preferably used as an adhesive product for various purposes that can be peeled off again after being attached. For example, for fixing the protective panel (lens) that protects the display part of electronic devices, for fixing the decoration panel of the display (for example, TV display), for fixing the battery pack of a personal computer, for waterproofing the lens of a digital video camera, etc. Adhesive products with tabs disclosed herein can be adopted. In particular, it is preferably used as a tabbed adhesive product for portable electronic devices, which requires a certain level of adhesive strength when used, but also requires smooth removal when repairing, replacing, inspecting, or recycling components. it can. For example, mobile phones, smartphones, tablet PCs, laptop PCs, various wearable devices (for example, wristwatch type that is worn on the wrist like a wristwatch, modular type that is worn on a part of the body with a clip or strap, glasses type) (Monocular type and binocular type, including head mount type), eyewear type, clothes 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, acoustic devices (portable music players, IC recorders, etc.), computers (calculators, etc.), portable game devices, electronic dictionaries, electronic notebooks, electronic books, in-vehicle information devices, portable radios, portable TVs, mobile phones In portable electronic devices such as printers, portable scanners, and portable modems, protective panel (lens) fixing, key module member fixing, rim sheet fixing, decoration panel fixing, battery fixing, and various other members (circuit board, various types) that protect the display unit Preferable for fixing panel members, buttons, lighting equipment members, internal camera members, heat dissipation materials, graphite sheets), fixing display objects (including various marks) such as logos (design letters) and various designs. Can be adopted. Among the tabbed adhesive products disclosed herein, those exhibiting an adhesive strength equal to or higher than a predetermined value are adhered to the impact when the portable electronic device is dropped when used in the portable electronic device. It can hold a fixed arrangement of members. This is particularly advantageous in battery fixing applications. This is because the battery to be fixed can expand over time, so a gap is provided around it, and improper fixing (peeling of the adhesive sheet) due to a drop impact or the like tends to be a significant defect. .. In addition, in this specification, "portable" means that it is not enough to be portable, but to have a level of portability that an individual (standard adult) can carry relatively easily. It shall mean.

Further, the tabbed adhesive product having excellent tensile removability is suitable as a tabbed adhesive product 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. Batteries are usually placed in places that need to be removed when repairing, replacing, or inspecting components (including batteries) of portable electronic devices. Therefore, the adhesive product for fixing the battery often needs to be removed. However, removing the battery by using a remover, peeling it off by hand, heating, or other physical means may damage the battery and may not be preferable in terms of safety. Reducing the peeling force by photo-curing is also not effective because it irradiates through the battery due to the location where the adhesive product is attached. The tabbed adhesive products disclosed herein use the above-mentioned tensile removal (typically pull-out removal) method when removing a battery that has expired, while providing a good fixing function for the battery. Then, the removal can be easily performed. The adhesive product is particularly preferable as an adhesive product used for the purpose of fixing a polymer battery. Polymer batteries tend to be more deformable than other types of batteries (typically batteries with metal cases), so traditional peeling methods can deform the battery and impair its functionality. there were. According to the tabbed adhesive products disclosed herein, the above-mentioned tensile removal (typically pull-out removal) method can be used to successfully remove the tabbed adhesive products while suppressing deformation of the polymer battery. it can.

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

Further, the adhesive product with a tab having excellent tensile removal property (typically pull-out removal property) is attached to a wall surface, a pillar, furniture, a home electric appliance, a glass surface, etc., and is replaced after being used for a predetermined period of time. It is also suitable as an adhesive product used for the purpose of fixing an article or a part (attached body, fixed object, attached object, etc.). Also in this application, the adhesive product exerts a good fixing function while the article or the like is fixed, and when the article or the like is removed, the entire adhesive product is pulled out by grasping the tab or the like provided on the adhesive product. Therefore, the adhesive product can be efficiently removed (for example, removal in the direction of the arrow in FIG. 14 (c)).

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

Matters disclosed by this specification include:
(1) A tabbed adhesive product comprising an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet.
The adhesive sheet is a double-sided adhesive sheet.
The adhesive sheet has a sticking portion for joining two objects and an anchor portion fixed to only one of the two objects.
The sticking portion is a tabbed adhesive product arranged between the anchor portion and the tab.
(2) In a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the bonded state of the two objects is released. ) With tabbed adhesive products.
(3) When the tab is pulled while the sticking portion is adhered to the two objects, the sticking portion is stretched and peeled off from the two objects, and the anchor portion is fixed to one of the two objects. The tabbed adhesive product according to (1) or (2) above, which is held in a state.
(4) The tabbed adhesive product according to any one of (1) to (3) above, wherein the adhesive sheet is stretched by elastic deformation.
(5) The adhesive sheet has a band shape, the tab is fixed to one end of the adhesive sheet in the longitudinal direction, and the anchor portion is located at the other end of the adhesive sheet in the longitudinal direction. The tabbed adhesive product according to any one of (1) to (4).
(6) The tabbed adhesive product according to (5) above, wherein the adhesive sheet has a strip shape extending in a straight line or a curved line.
(7) The tabbed adhesive product according to (5) or (6) above, wherein the ratio (L / W) of the length L to the width W of the adhesive sheet is 2 or more.
(8) The tabbed adhesive product according to any one of (1) to (7) above, wherein the area ratio of the anchor portion in the adhesive sheet is 1 to 10%.
(9) The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive provided on the second surface of the film-like base material. The tabbed adhesive product according to any one of (1) to (8) above, which comprises an agent layer.
(10) The tabbed adhesive product according to any one of (1) to (9) above, which is used for fixing a battery of a portable electronic device.

(11) The adhesive sheet has an adhesive layer and has an 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 the formula (1): as a monomer component.
CH ₂ = C (R ¹ ) COOR ² (1)
(R ¹ in the above formula (1) is a hydrogen atom or a methyl group, and R ² is a chain alkyl group having 1 to 20 carbon atoms.); An alkyl (meth) acrylate represented by The tabbed adhesive product according to any one of (1) to (10) above, which contains 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, and 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 (11) The above (11), which is at least one selected from the group consisting of (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecil (meth) acrylate and ecocil (meth) acrylate. ) With tabbed adhesive products.
(13) The acrylic polymer further contains 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 -The tabbed adhesive product according to (11) or (12) above, which is at least one selected from the group consisting of hydroxybutyl (meth) acrylate.
(14) The pressure-sensitive adhesive layer contains a pressure-sensitive adhesive resin having a softening point of 100 ° C. or higher.
The tabbed adhesive product according to any one of (11) to (13) above, wherein the tackifier resin contains at least one of a rosin-based tackifier resin and a terpene-based tackifier resin.
(15) The tabbed adhesive product according to any one of (11) to (14) above, 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 tabbed adhesive product according to any one of (11) to (15) above, wherein the pressure-sensitive adhesive layer contains an acrylic oligomer.
(17) The pressure-sensitive adhesive layer contains filler particles and contains
The filler particles include aluminum, chromium, iron, stainless steel, aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, zinc oxide, tin oxide, copper oxide, nickel oxide, aluminum hydroxide, boehmite, magnesium hydroxide, and calcium hydroxide. , Zinc hydroxide, silicic acid, iron hydroxide, copper hydroxide, barium hydroxide, zirconium oxide hydrate, tin oxide hydrate, basic magnesium carbonate, hydrotalcite, dosonite, borosand, zinc borate, silicon carbide , At least one selected from the group consisting of boron carbide, nitrogen hydroxide, calcium hydroxide, aluminum nitride, silicon nitride, boron nitride, gallium nitride, calcium carbonate, barium titanate and potassium titanate, the above (11) to The tabbed adhesive product according to any one of (16).

(18) The above (11) to (17) further include a film-like base material that supports the pressure-sensitive adhesive layer, and the film-like base material is a resin film base material having a foaming ratio of less than 1.1 times. Adhesive products with tabs listed in either.
(19) The film-like substrate according to (18) above, which comprises 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 base material contains polyurethane in a proportion of 70% by weight or more.
The tabbed adhesive product according to (18) or (19) above, wherein the polyurethane is an ether-based polyurethane, an ester-based polyurethane, or a carbonate-based polyurethane.

(21) A tabbed adhesive product comprising an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet.
The adhesive sheet according to any one of (1) to (20) above, which has a sticking portion to be attached to an adherend and a non-adhesive portion located between the sticking portion and the tab. Adhesive product with tabs.
(22) When the tab is pulled in a state where the sticking portion is adhered to the adherend, the non-sticking portion is stretched with priority over the sticking portion, and this stretching causes the sticking portion to be stretched. The tabbed adhesive product according to (21) above, which begins to peel off from the body.
(23) The tabbed adhesive product according to (21) or (22) above, wherein the adhesive sheet has a band shape, and the tab is fixed to one end of the adhesive sheet in the longitudinal direction.
(24) The tabbed adhesive product according to (23) above, wherein the ratio (L / W) of the length L to the width W of the adhesive sheet is 2 or more.
(25) The tabbed adhesive product according to any one of (21) to (24) above, wherein the area ratio of the non-attached portion in the adhesive sheet is 1 to 10%.
(26) The tabbed adhesive product according to any one of (21) to (25) above, wherein the adhesive sheet is a double-sided adhesive adhesive sheet.
(27) The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive provided on the second surface of the film-like base material. The tabbed adhesive product according to (26) above, comprising an agent layer.
(28) It is used to join two objects, and in a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the two objects are stretched. The tabbed adhesive product according to (26) or (27) above, wherein the bonded state of the above is released.
(29) In a state where the two objects are joined with the adhesive sheet sandwiched between them, the non-attached portion and the tab are exposed to the outside of the two objects, and the non-attached portion is attached to the two objects. The tabbed adhesive product according to any one of (26) to (28) above, wherein the tab is aligned with the outer surface of the one object by contacting one of them.
(30) The tabbed adhesive product according to any one of (21) to (29) above, which is used for fixing a battery of a portable electronic device.

(31) A tabbed adhesive product comprising an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet.
The tabbed adhesive product according to any one of (1) to (30) above, wherein the adhesive sheet has a band shape, and the band shape of the adhesive sheet has a bent portion.
(32) The tabbed adhesive product according to (31) above, wherein the adhesive sheet has a shape along at least a part of the outer periphery of the surface of the adherend to which the adhesive sheet is attached.
(33) The tabbed adhesive product according to (31) or (32) above, wherein the adhesive sheet has a U-shape.
(34) The tabbed adhesive product according to (31) or (32) above, wherein the adhesive sheet has a wavy shape.
(35) The tabbed adhesive product according to any one of (31) to (34) above, wherein the adhesive sheet exhibits a breaking strength of 10 MPa or more.
(36) The tabbed adhesive product according to any one of (31) to (35) above, wherein the width of the adhesive sheet is 5 mm or less.
(37) The tabbed adhesive product according to any one of (31) to (36) above, wherein the adhesive sheet is a double-sided adhesive adhesive sheet.
(38) The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive provided on the second surface of the film-like base material. The tabbed adhesive product according to (37) above, comprising an agent layer.
(39) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the two objects are stretched. The tabbed adhesive product according to (37) or (38) above, wherein the bonded state of the above is released.
(40) The tabbed adhesive product according to any one of (31) to (39) above, which is used for fixing a battery of a portable electronic device.

(41) A tabbed adhesive product comprising an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet.
The adhesive sheet has a band shape and has a band shape.
The tabbed adhesive product according to any one of (1) to (40) above, wherein the maximum width of the adhesive sheet is larger than the width of the tab.
(42) The tabbed adhesive product according to (41) above, 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.
(43) The tabbed adhesive product according to (41) or (42) above, wherein the adhesive sheet has a portion in the longitudinal direction of the adhesive sheet whose width increases linearly as the distance from the tab increases.
(44) The width of the adhesive sheet according to any one of (41) to (43) above, wherein the width of the adhesive sheet increases in the longitudinal direction of the adhesive sheet as the distance from the tab increases, reaches the maximum width, and then tapers. Adhesive product with tabs.
(45) The tabbed adhesive product according to any one of (41) to (44) above, wherein the adhesive sheet exhibits a breaking strength of 10 MPa or more.
(46) The tabbed adhesive product according to any one of (41) to (45) above, wherein a concave step is formed on the surface of the tab.
(47) The tabbed adhesive product according to any one of (41) to (46) above, wherein the adhesive sheet is a double-sided adhesive adhesive sheet.
(48) The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive provided on the second surface of the film-like base material. The tabbed adhesive product according to (47) above, comprising an agent layer.
(49) Used to join two objects, the adhesive sheet is stretched by pulling the tab in a state where the two objects are joined with the adhesive sheet sandwiched between them, and the two objects are stretched. The tabbed adhesive product according to (47) or (48) above, wherein the bonded state of the above is released.
(50) The tabbed adhesive product according to any one of (41) to (49) above, which is used for fixing a battery of a portable electronic device.

(51) A stretchable adhesive sheet and a tab are provided.
The tabbed adhesive product according to any one of (1) to (50) above, wherein the adhesive sheet has a plurality of portions extending from the tab.
(52) The adhesive sheet is composed of two or more adhesive sheet pieces.
The tabbed adhesive product according to (51) above, wherein each of the two or more adhesive sheet pieces is connected to the tab.
(53) Each of the two or more adhesive sheet pieces has a band shape, and is arranged so as to extend in the longitudinal direction of each adhesive sheet piece when the tab is pulled. 52) The tabbed adhesive product according to.
(54) The tabbed adhesive product according to (53) above, wherein each of the two or more adhesive sheet pieces has a tab fixed to the end thereof.
(55) The tabbed adhesive product according to (54) above, wherein the two or more adhesive sheet pieces are arranged in parallel with each other.
(56) The tabbed adhesive product according to any one of (51) to (55) above, wherein the adhesive sheet is a double-sided adhesive adhesive sheet.
(57) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the two objects are stretched. The tabbed adhesive product according to (56) above, wherein the bonded state of the above is released.
(58) Used to join two or more members to a substrate,
The tabbed adhesive product according to (56) above, wherein each of the adhesive sheet pieces joins each of the two or more members to the base material.
(59) 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 (57) or (58) above, wherein the two or more adhesive sheet piece fixing portions are connected to each other in a separable state.
(60) The tabbed adhesive product according to any one of (51) to (59) above, which is used for fixing a battery of a portable electronic device.

(61) A tabbed adhesive product comprising an extensible adhesive sheet and a tab fixed to the adhesive sheet.
The tabs (1) to (60) above include a first tab film fixed to the first surface of the adhesive sheet and a second tab film fixed to the second surface of the adhesive sheet. Adhesive products with tabs listed in either.
(62) The tabbed adhesive product according to (61) above, wherein the first tab film is smaller than the second tab film.
(63) The first surface of the adhesive sheet to which the first tab film is fixed has a sticking portion to be attached to the adherend and an exposed portion protruding from the sticking surface of the adherend. Ori,
The tabbed adhesive product according to (62) above, wherein the exposed portion is located between the pasting portion and the first tab film.
(64) The tabbed adhesive product according to any one of (61) to (63) above, 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) above, 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 one of (61) to (65) above, wherein the first tab film and the second tab film do not protrude from the adhesive sheet.
(67) The tabbed adhesive product according to any one of (61) to (66) above, wherein the adhesive sheet is a double-sided adhesive adhesive sheet.
(68) The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive provided on the second surface of the film-like base material. The tabbed adhesive product according to (67) above, comprising an agent layer.
(69) Used for joining two objects, in a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the two objects are stretched. The tabbed adhesive product according to (67) or (68) above, wherein the bonded state of the above is released.
(70) The tabbed adhesive product according to any one of (61) to (69) above, which is used for fixing a battery of a portable electronic device.

A1, A2 object (adhesive body)
101 Adhesive product with tabs 110, 710 (extensible) Adhesive sheet 112 Adhesive part 116 Anchor part 150 Tab 720 Film-like base material 721,722 Adhesive layer

Claims (15)

An adhesive product with a tab for a portable electronic device , comprising an extensible adhesive sheet and a tab provided at the end of the adhesive sheet.
The adhesive sheet is a double-sided adhesive sheet.
The pressure-sensitive adhesive sheet exhibits 100% modulus with a tensile recovery rate of 70% or more and less than 10 MPa measured by the following method .
The ratio (L / W) of the length L to the width W of the adhesive sheet is 2 or more.
The adhesive sheet has a sticking portion for joining two objects and an anchor portion fixed to only one of the two objects.
The sticking portion is a tabbed adhesive product arranged between the anchor portion and the tab.
[Tension recovery rate]
For the adhesive sheet, a tensile test is performed in which the specific section distance L0 of the adhesive sheet is stretched by 100%. When the length of the specific section 5 minutes after the adhesive sheet is stretched 100% and then released is L1, the formula: tensile recovery rate (%) = L0 / L1 × 100; Ask for. The tabbed adhesive product according to claim 1, wherein the adhesive sheet exhibits a breaking strength of 10 MPa or more. The tabbed adhesive product according to claim 1 or 2, wherein the width of the adhesive sheet is 5 mm or less. Claims 1 to 3 that, in a state where the two objects are joined with the adhesive sheet sandwiched between them, the adhesive sheet is stretched by pulling the tab, and the bonded state of the two objects is released . Adhesive products with tabs described in any one item . When the tab is pulled while the sticking portion is adhered to the two objects, the sticking portion is stretched and peeled off from the two objects, and the anchor portion is held in a state of being fixed to one of the two objects. It is the tabbed adhesive product according to any one of請Motomeko 1-4. The tabbed adhesive product according to any one of claims 1 to 5 , wherein the adhesive sheet is stretched by elastic deformation. The adhesive sheet has a band shape, the tab is fixed to one end in the longitudinal direction of the adhesive sheet, and the anchor portion is located at the other end in the longitudinal direction of the adhesive sheet, claims 1 to 1. Adhesive product with tab according to any one of 6 . The tabbed adhesive product according to claim 7 , wherein the adhesive sheet has a strip shape extending in a straight line or a curved line. The tabbed adhesive product according to any one of claims 1 to 8 , wherein the area ratio of the anchor portion in the adhesive sheet is 1 to 10%. The pressure-sensitive adhesive sheet includes a film-like base material, a first pressure-sensitive adhesive layer provided on the first surface of the film-like base material, and a second pressure-sensitive adhesive layer provided on the second surface of the film-like base material. The tabbed adhesive product according to any one of claims 1 to 9 , further comprising. The tabbed adhesive product according to any one of claims 1 to 10, wherein the adhesive sheet has a band shape, and the band shape of the adhesive sheet has a bent portion. The tabbed adhesive product according to any one of claims 1 to 11, wherein the adhesive sheet has a band shape, and the maximum width of the adhesive sheet is larger than the width of the tab. The portable is used to secure the battery of the electronic device, tabbed adhesive product according to any of claims 1 to 12. It ’s a portable electronic device,
It comprises an object A1, an object A2 that is relatively larger than the object A1, and a tabbed adhesive product.
The tabbed adhesive product comprises an stretchable adhesive sheet and tabs provided at the ends of the adhesive sheet.
The adhesive sheet is a double-sided adhesive sheet.
The adhesive sheet has a tensile recovery rate of 70% or more as measured by the following method.
The adhesive sheet has a sticking portion for joining the object A1 and the object A2, and an anchor portion fixed only to the object A2.
The sticking portion is arranged between the anchor portion and the tab.
When the tab was pulled while the sticking portion was adhered to the object A1 and the object A2, the sticking portion was stretched and peeled off from the object A1 and the object A2, and the anchor portion was fixed to the object A2. A portable electronic device that is held in a state.
[Tension recovery rate]
For the adhesive sheet, a tensile test is performed in which the specific section distance L0 of the adhesive sheet is stretched by 100%. When the length of the specific section 5 minutes after the adhesive sheet is stretched 100% and then released is L1, the formula: tensile recovery rate (%) = L0 / L1 × 100; Ask for. The portable electronic device according to claim 14, wherein the object A1 is a battery, and the object A2 is a component of the portable electronic device.

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