JPWO2020162204A1 - Electronic components - Google Patents

Abstract

It can be peeled off quickly, is not contaminated by adhesive after peeling, and even if it is torn off in the middle of stretching and peeling from one end, it can be stretched and peeled from the other end and peeled to the end. Provided are an electronic component provided with an adhesive sheet having an adhesive force suitable for use. One surface is attached so that at least a part is linear with respect to the first attachment target, the other surface is attached to the second attachment target, and at least two ends are the first. (Ii) The present invention relates to an electronic component provided with an adhesive sheet attached to the second attachment object in a state of being exposed from the attachment object.

Description

The present invention relates to electronic components.

Adhesive sheets (sometimes referred to as "adhesive tapes") are widely used as bonding means with excellent workability and high adhesive reliability in situations such as fixing parts constituting electronic devices. Specifically, fixing of sheet metal that constitutes relatively large electronic devices such as flat-screen TVs, home appliances, and OA equipment, fixing of exterior parts and housings, and relatively small size of portable electronic terminals, cameras, personal computers, etc. Adhesive tape is used for fixing parts in various industrial fields such as fixing exterior parts and rigid parts such as batteries to electronic devices, for temporary fixing of the parts, and for labels that display product information. in use.

In recent years, in each of the above industrial fields, for the purpose of resource saving from the viewpoint of global environmental protection, reusable or reusable parts used in products should be disassembled and reused or reused after use. Is increasing. At this time, when an adhesive tape is used, it is necessary to peel off the adhesive tape attached to the part. However, the adhesive tape usually has a large adhesive force and is applied to many places in the product. Since they were affixed, the work of peeling them off was a considerable amount of labor. Therefore, it is required to reduce the work cost by easy peeling and removal at the time of the reuse or reuse.

As an adhesive tape that can be easily peeled off and removed, an adhesive portion and a tab portion are provided, and the tab portion can be projected and sandwiched from one of the outer extension portion of the first adherend and the outer extension portion of the second adherend. There has been proposed an adhesive tape that is attached so as to be such that the tab portion is sandwiched and can be stretched and peeled off in a direction substantially parallel to the adhesive surface (see Patent Document 1). However, when the adhesive tape of this proposal has only one tab portion (grip portion) for stretching and peeling, the adhesive surface on the side opposite to the side having the tab portion of the adhesive tape (that is, one at the time of peeling). On the surface to which the adhesive tape is adhered for the longest time), there is a problem that the adhesive remains on the adherend after the adhesive tape is peeled off, causing contamination. Further, if the tab portion at one end is torn off in the middle of being stretched and peeled off, there is also a problem that the parts cannot be peeled off any more and the reusable or reusable parts and the like cannot be disassembled any more.

On the other hand, as shown in FIG. 1, an adhesive region (2) adjacent to the grip tab (1) located at one end of the adhesive film piece and extending toward the other end (3) is formed. Although included, here, the adhesive region (2) is sequentially formed in the second adhesive region (5) from the grip tab (1) toward the other end portion (3) of the main adhesive film piece. A first adhesive region (4) having a relatively large cross-sectional area, a second adhesive region (5) having a cross-sectional area that sharply decreases toward the terminal portion (3), and a terminal portion (3) are formed. Adhesive films have been proposed that include a third adhesive region (6), which is sloping and terminates at one or more tips (7) towards the end (3) ( See Patent Document 2). However, in the case of the shape of the adhesive film of the present proposal, there is a problem that the sticking area becomes small, the stickable area cannot be effectively used, and the adhesive strength becomes weak. In the above-mentioned electronic device, it is a big problem that the parts constituting the electronic device are peeled off at the time of use, and it is necessary to maintain the adhesive strength until the electronic parts are collected for reuse or reusability. There is.

Therefore, it can be peeled off quickly, is not contaminated by the adhesive after peeling, and even if it is torn off in the middle of stretching and peeling from one end, it can be stretched and peeled from the other end and peeled to the end. In addition, there is a strong demand for the provision of electronic components provided with an adhesive sheet having an adhesive force suitable for use.

Japanese Unexamined Patent Publication No. 2015-124289 U.S. Pat. No. 6,680,906

An object of the present invention is to solve the above-mentioned conventional problems and to achieve the following object. That is, the present invention can be quickly peeled off, is not contaminated by an adhesive after peeling, and even if it is torn off in the middle of stretching and peeling from one end, it is stretched and peeled from the other end and peeled to the end. It is an object of the present invention to provide an electronic component provided with an adhesive sheet which can be used and has an adhesive force suitable for use.

The means for solving the above-mentioned problems are as follows.
That is, one surface is attached so that at least a part is linear with respect to the first attachment target, the other surface is attached to the second attachment target, and at least two ends are attached. The electronic component is provided with an adhesive sheet attached to the second attachment object in a state of being exposed from the second attachment object.

According to the present invention, the above-mentioned problems in the prior art can be solved, the above object can be achieved, the peeling can be performed quickly, there is no contamination by the adhesive after the peeling, and the stretch peeling is performed from one end. It is possible to provide an electronic component provided with an adhesive sheet which can be stretched and peeled from the other end even if it is torn and can be peeled to the end and has a suitable adhesive force at the time of use.

FIG. 1 is a diagram showing an adhesive film of the prior art. FIG. 2A is a schematic explanatory view (top view) showing one aspect of the electronic component of the present invention. FIG. 2B is a schematic explanatory view (cross-sectional view) showing one aspect of the electronic component of the present invention. FIG. 2C is a schematic explanatory view (cross-sectional view) showing another aspect of the electronic component of the present invention. FIG. 2D is a schematic explanatory view (top view) showing another aspect of the electronic component of the present invention. FIG. 2E is a schematic explanatory view (top view) showing another aspect of the electronic component of the present invention. FIG. 2F is a schematic explanatory view (top view) showing another aspect of the electronic component of the present invention. FIG. 2G is a schematic explanatory view (top view) showing another aspect of the electronic component of the present invention. FIG. 3A is a schematic explanatory view (cross-sectional view) when the electronic component of the present invention is a battery. FIG. 3B is a schematic explanatory view (top view) when the electronic component of the present invention is a battery. FIG. 3C is a schematic explanatory view (cross-sectional view) showing another aspect when the electronic component of the present invention is a battery. FIG. 4A is a schematic explanatory view (cross-sectional view) when the electronic component of the present invention is a television display. FIG. 4B is a schematic explanatory view (top view) when the electronic component of the present invention is a television display. FIG. 5A is a schematic explanatory view (cross-sectional view) of a method of attaching the adhesive sheet 31 to the acrylic plate 32 when evaluating the impact resistance in the examples. FIG. 5B is a schematic explanatory view (top view) of the test piece produced when evaluating the impact resistance in the examples. FIG. 5C is a schematic explanatory view (cross-sectional view) of a method of installing the test piece on the U-shaped measuring table when evaluating the impact resistance in the examples. FIG. 6A is a schematic explanatory view (cross-sectional view) of the attachment mode X in Test Examples 1 to 11 and the extension direction (horizontal direction) in the extension peeling test. FIG. 6B is a schematic explanatory view (cross-sectional view) of the attachment mode X in Test Examples 1 to 11 and the extension direction (vertical direction) in the extension peeling test. FIG. 6C is a schematic explanatory view (cross-sectional view) of the attachment mode Y in Comparative Test Examples 1 to 11 and the extension direction (horizontal direction) in the extension peeling test. FIG. 7A is a diagram showing the appearance of the acrylic plate after horizontal stretching and peeling of Test Example 1 (Attachment Aspect X). FIG. 7B is a diagram showing the appearance of the acrylic plate after horizontal stretching and peeling of Test Example 1 (Attachment Mode Y).

(Electronic components)
One surface of the electronic component is attached so that at least a part of it is linear with respect to the first attachment target, the other surface is attached to the second attachment target, and at least two of them are attached. The adhesive sheet attached to the second attachment object is provided with the end portion exposed from the second attachment object. In addition, in this specification, the first sticking object or the second sticking object may be collectively referred to as an "adhesive body".

In the present specification, the electronic components include not only various components such as sheet metal, exterior, housing, and batteries constituting the electronic device, but also TVs, home appliances, OA devices, portable electronic terminals, cameras, personal computers, and the like. Electronic devices themselves are also included.

Hereinafter, the configuration of the electronic component will be specifically described with reference to the drawings, but the present invention is not limited to these aspects.

As shown in FIGS. 2A and 2B, in the electronic component, at least a part of one surface 21a of the pressure-sensitive adhesive sheet 21 is linear on one surface of the first attachment target 22 constituting the electronic component. It is pasted so that it becomes. Next, the other surface 21b of the pressure-sensitive adhesive sheet 21 is attached to the second attachment target 23 constituting the electronic component. At this time, the two end portions of the adhesive sheet 21 in the length direction are attached in a state of being exposed from the second attachment target 23. As a result, at least a part of each end portion of the adhesive sheet 21 exposed from the second attachment target 23 functions as a grip portion. FIG. 2C is a diagram showing another aspect of the electronic component.

In FIGS. 2A to 2C, the adhesive sheet is attached so as to be linear with respect to the object to be attached, and the adhesive sheet has two end portions. However, the adhesive sheet has one surface. However, it is sufficient that at least a part of the adhesive sheet is linearly attached to the first object to be attached, and as shown in FIGS. 2D to 2G, the adhesive sheet is attached to the first object to be attached. On the other hand, it may be attached in a shape branched in the middle or a shape bent in the middle. Therefore, the number of ends (grip portions) of the pressure-sensitive adhesive sheet is not particularly limited and can be appropriately selected depending on the sticking shape of the pressure-sensitive adhesive sheet and the like. At this time, the number of edges of the adhesive sheet exposed from the second sticking object is not particularly limited as long as it is at least two, and can be appropriately selected depending on the purpose, but all edges. It is preferable that the portion is exposed from the second attachment target. Hereinafter, each end of the adhesive sheet 21 exposed from the second attachment target 23 will be referred to as a first grip portion A, a second grip portion B, a third grip portion C, a fourth grip portion D, and the like. Sometimes.
In FIGS. 2A to 2G, each grip portion A to D is not exposed from the first attachment target 22, but at least two of the grip portions A to D are attached to at least the second attachment portion 22. As long as it is exposed from the target 23, there is no particular limitation, and at least one of the grip portions A to D may be exposed from the first attachment target 22.

<Grip part>
As shown in FIGS. 2A and 2B, the grip portion may be arranged as it is on the first attachment target 22, or as shown in FIG. 2C, the side surface (thickness direction) of the second attachment target 23. (Surface) may be arranged (first gripping portion A and second gripping portion B in FIGS. 2A to 2C), and although not shown in the figure, the first sticking target 22 and the second sticking target It may be arranged so as to be in contact with other elements in the electronic component adjacent to at least one of the 23.

The grip portion is an end portion of the adhesive sheet, and the number of adhesive layers on the adhesive surface with at least one of the first sticking target and the second sticking target and the number of adhesive layers in the grip portion. May be the same or different. For example, when the pressure-sensitive adhesive sheet has pressure-sensitive adhesive layers on both sides thereof, the pressure-sensitive adhesive layer in at least one of the plurality of gripping portions may be arranged on only one side. Further, the number of adhesive layers in the plurality of gripping portions may be the same as or different from each other.

Further, the grip portion may be formed by processing at least a part of the end portion of the pressure-sensitive adhesive sheet. The processing is not particularly limited and may be appropriately selected depending on the intended purpose. For example, processing for removing the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet, processing for arranging a release sheet on the surface of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet, and the above-mentioned processing. Examples thereof include a process of modifying the adhesive layer of the adhesive sheet to be non-adhesive by a known means such as a release agent.

The release sheet is not particularly limited and may be appropriately selected depending on the intended purpose. For example, paper such as kraft paper, glassin paper, high-quality paper; polyethylene, polypropylene (biaxially stretched polypropylene (OPP), uniaxially stretched). Resin films such as polypropylene (CPP)) and polyethylene terephthalate (PET); laminated paper in which the paper and the resin film are laminated, and silicone on one or both sides of the paper that has been sealed with clay or polyvinyl alcohol. Examples thereof include those that have been subjected to a peeling treatment such as a based resin. These may be used alone or in combination of two or more.

The length of the grip portion is not particularly limited as long as it can be stretched, and may be set to a distance between the first attachment target and other electronic components adjacent to the second attachment target. It can be appropriately selected depending on the situation, but 5 mm or more is preferable, 10 mm or more is more preferable, and 15 mm or more is further preferable. The upper limit of the length is not particularly limited and may be appropriately selected depending on the size of the electronic component and the like, but 20 mm or less is preferable.
The length of each grip portion may be the same or different.

The width of the grip portion is not particularly limited and may be appropriately selected depending on the width of the adhesive sheet and the like.

<Extension direction p>
The adhesive sheet 21 in the electronic component is easily stretched and peeled off by stretching in the stretching direction p shown in FIGS. 2B and 2C. FIG. 2B shows an aspect in which the extension direction p of the adhesive sheet 21 is the horizontal direction (180 ° direction) with respect to the attachment surfaces of the first attachment target 22 and the second attachment target 23, and FIG. 2C shows an aspect. The extension direction p of the pressure-sensitive adhesive sheet 21 is perpendicular to the sticking surfaces of the first sticking target 22 and the second sticking target 23 (90 ° direction), but the first sticking target 22 and The angle of the extension direction p with respect to the sticking surface with the second sticking target 23 is not particularly limited and can be appropriately selected depending on the surrounding environment of the electronic component and the like.

The adhesive sheet in the electronic component may be peeled off by simultaneously stretching the plurality of grip portions, and after one of the plurality of grip portions is stretched, a part of the adhesive sheet is peeled off, and then the other is peeled off. The rest may be peeled off by stretching. Further, since at least two ends of the adhesive sheet in the electronic component are exposed from the second attachment target, the adhesive sheet is stretched and peeled off from one end (first grip portion). Even if it is torn, it is advantageous in that it can be stretched and peeled from the other end (second grip) and peeled to the end.

The removability of the pressure-sensitive adhesive sheet in the electronic component can be confirmed, for example, by the method described in << Evaluation of removability 1 >> in a test example described later. In the evaluation of re-peelability, there is no contamination by the adhesive after peeling, and even if the material is torn off in the middle of being stretched and peeled from the grip at one end, it can be stretched and peeled from the grip at the other end and peeled to the end. Is excellent in removability.

<Width of sticking area / Length of sticking area (X / Y)>
When the width of the sticking area of the adhesive sheet in the electronic component is X (cm) and the length of the sticking area is Y (cm), the sticking is made with respect to the length of the sticking area represented by [X / Y]. The ratio of the width of the area is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1/1 to 1 / 100,000, more preferably 1/1 to 1 / 10,000. 1/1 to 1/1000 is more preferable. If the ratio of the sticking area is less than 1/1, the adhesive strength may be insufficient, and if it exceeds 1 / 100,000, the adhesive sheet may be torn during stretch peeling, or the adhesive may be used after peeling. Contamination may occur.

<First sticking target or second sticking target>
The first sticking target and the second sticking target may be the same part or different parts. Further, the first sticking target and the second sticking target may be interchanged.

The material of the first sticking target and the second sticking target is not particularly limited and may be appropriately selected depending on the type of electronic component or the like, for example, metal, alloy, glass, plastic, ceramic or the like. Can be mentioned. These may be used alone or in combination of two or more.

Specific examples of the first attachment target include a back chassis, a bezel, a sheet metal, a housing, a heat radiating sheet, and the like.

Specific examples of the second attachment target include display glass, batteries, heat radiating members such as heat sinks, speakers, camera lenses, and the like.

Among these, it is preferable that the first sticking target and the second sticking target are recovered parts. The recovered parts are not particularly limited as long as they are reusable or reusable parts, and can be appropriately selected according to the purpose. For example, recovered parts when a defect occurs in the manufacturing process of electronic parts. , Parts collected at the time of disposal, etc. The adhesive sheet in the electronic component can be quickly peeled off, is not contaminated by the adhesive after peeling, and even if it is torn off in the middle of stretching and peeling from one end, it is stretched and peeled from the other end and finally. Since at least one of the first sticking target and the second sticking target as the recovery parts can be quickly recovered, the first sticking target and the second sticking target can be quickly peeled off. It is advantageous in that there is no contamination when at least one of the second application objects is reused or reused.

Hereinafter, more specific embodiments of the electronic components will be described with reference to the drawings, but the present invention is not limited to these embodiments.

The embodiment when the electronic component is a small component such as a battery will be specifically described below.
As shown in FIGS. 3A and 3B, one surface 61a of the adhesive sheet 61 is attached so that at least a part thereof is linear with respect to the fixed portion of the battery 63 of the back chassis 62. The other surface 61b of the adhesive sheet 61 is then attached to the battery 63. At this time, the two end portions (first grip portion A and second grip portion B) of the adhesive sheet 61 in the length direction (extension direction) are attached in a state of being exposed from both ends of the battery 63. Further, the method of attaching the first grip portion A and the second grip portion B on the pressure-sensitive adhesive sheet 61 may be as shown in FIG. 3C.

In addition, an embodiment in the case where the electronic component is a large component such as a television display will be specifically described below.
As shown in FIGS. 4A and 4B, one surface of the adhesive sheet 71 is attached so that at least a part of the surface of the adhesive sheet 71 is linear with respect to the fixed portion of the display 73 of the bezel 72. The other surface of the pressure-sensitive adhesive sheet 71 is then attached to the display 73. At this time, the two end portions (first grip portion A and second grip portion B) of the adhesive sheet 71 in the length direction (extension direction) are attached in a state of being exposed from both ends of the display 73.

<Adhesive sheet>
The pressure-sensitive adhesive sheet has at least a pressure-sensitive adhesive layer, preferably a base material layer, and, if necessary, another layer.
It is preferable that at least one of the one surface of the pressure-sensitive adhesive sheet and the other surface of the pressure-sensitive adhesive sheet is composed of the pressure-sensitive adhesive layer, and both the one surface of the pressure-sensitive adhesive sheet and the other surface of the pressure-sensitive adhesive sheet are composed of the pressure-sensitive adhesive layer. Is more preferable.

<< Adhesive layer >>
The pressure-sensitive adhesive layer contains at least a pressure-sensitive adhesive composition and, if necessary, other components.

-Adhesive composition-
The pressure-sensitive adhesive composition contains at least the pressure-sensitive adhesive resin and, if necessary, further contains other components.

The pressure-sensitive adhesive resin is not particularly limited and may be appropriately selected from known materials. For example, acrylic pressure-sensitive adhesive resin, rubber-based pressure-sensitive adhesive resin, urethane-based pressure-sensitive adhesive resin, and silicone-based pressure-sensitive adhesive resin. And so on. These may be used alone or in combination of two or more. Among these, as the pressure-sensitive adhesive resin, an acrylic pressure-sensitive adhesive resin is preferable.

--Acrylic adhesive resin ---
The acrylic pressure-sensitive adhesive resin is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a resin containing an acrylic polymer and, if necessary, an additive such as a pressure-imparting resin or a cross-linking agent. And so on.

The acrylic polymer can be produced, for example, by polymerizing a monomer mixture containing a (meth) acrylic monomer.
As the (meth) acrylic monomer, for example, an alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms can be used.
Specific examples of the alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and t. -Butyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, etc. Can be mentioned. These may be used alone or in combination of two or more.

As the alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms, it is preferable to use an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms, and the alkyl (meth) acrylate having 4 to 8 carbon atoms is preferable. It is more preferable to use an alkyl (meth) acrylate having an alkyl group, and it is particularly preferable to use an n-butyl acrylate in order to ensure excellent adhesion to the adherend.

The alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms is used in the range of 80% by weight to 98.5% by weight with respect to the total amount of the monomers used in the production of the acrylic polymer. It is more preferable to use it in the range of 90% by weight to 98.5% by weight.

As the monomer that can be used for producing the acrylic polymer, a highly polar vinyl monomer can be used, if necessary, in addition to the above-mentioned ones.
Examples of the highly polar vinyl monomer include (meth) acrylic monomers having a hydroxyl group, (meth) acrylic monomers having a carboxyl group, and (meth) acrylic monomers having an amide group. ) Acrylic monomer, vinyl acetate, ethylene oxide-modified amber acid acrylate, sulfonic acid group-containing monomer such as 2-acrylamide-2-methylpropanulphonic acid and the like can be mentioned. These may be used alone or in combination of two or more.

Specific examples of the vinyl monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate and the like. (Meta) acrylic monomer and the like.

The vinyl monomer having a hydroxyl group is preferably used when a resin containing an isocyanate-based cross-linking agent is used as the pressure-sensitive adhesive resin. Specifically, as the vinyl monomer having a hydroxyl group, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate are preferably used.

The vinyl monomer having a hydroxyl group is preferably used in the range of 0.01% by weight to 1.0% by weight, based on the total amount of the monomers used in the production of the acrylic polymer. It is more preferable to use it in the range of 03% by weight to 0.3% by weight.

Specific examples of the vinyl monomer having a carboxyl group include (meth) such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, and ethylene oxide-modified amber acid acrylate. Acrylic monomer and the like can be mentioned. Of these, acrylic acid is preferable.

Specific examples of the vinyl having an amide group include (meth) acrylic monomers such as N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylamide, and N, N-dimethylacrylamide.

The highly polar vinyl monomer is preferably used in the range of 1.5% by weight to 20% by weight, preferably 1.5% by weight, based on the total amount of the monomers used in the production of the acrylic polymer. It is more preferable to use it in the range of 10% by weight, and it is possible to form an adhesive layer balanced in terms of cohesive force, holding power and adhesiveness by using it in the range of 2% by weight to 8% by weight. More preferred.

The method for producing the acrylic polymer is not particularly limited, and can be appropriately selected from known methods according to the intended purpose. For example, the monomer can be selected by a solution polymerization method, a massive polymerization method, or a suspension. Examples thereof include a method of polymerizing by a polymerization method such as a turbid polymerization method and an emulsion polymerization method. Among these, the acrylic polymer is preferably produced by a solution polymerization method or a bulk polymerization method.

In the case of the above-mentioned polymerization, if necessary, a peroxide-based thermal polymerization initiator such as benzoyl peroxide or lauroyl peroxide, an azo thermal polymerization initiator such as azobisisobutylnitrile, an acetophenone-based photopolymerization initiator, etc. Benzoin ether-based photopolymerization initiators, benzyl ketal-based photopolymerization initiators, acylphosphine oxide-based photopolymerization initiators, benzoin-based photopolymerization initiators, benzophenone-based photopolymerization initiators, and the like can be used.

As the weight average molecular weight of the acrylic polymer obtained by the above method, a gel permeation chromatograph (GPC) having a weight average molecular weight of 300,000 to 3 million measured in terms of standard polystyrene shall be used. Is preferable, and it is more preferable to use one having a value of 500,000 to 2.5 million.

Here, the measurement of the weight average molecular weight of the acrylic polymer by the GPC method is a standard polystyrene-equivalent value measured by using a GPC apparatus (HLC-8329GPC, manufactured by Tosoh Corporation), and the measurement conditions are as follows. Is.
[Measurement condition]
-Sample concentration: 0.5% by weight (tetrahydrofuran (THF) solution)
-Sample injection volume: 100 μL
-Eluent: THF
・ Flow velocity: 1.0 mL / min ・ Measurement temperature: 40 ° C
-This column: TSKgel GMHHR-H (20) 2 pieces-Guard column: TSKgel HXL-H
・ Detector: Differential refractometer ・ Standard polystyrene molecular weight: 10,000 to 20 million (manufactured by Tosoh Corporation)

As the acrylic pressure-sensitive adhesive resin, it is preferable to use a resin containing a pressure-sensitive adhesive resin in order to improve the adhesion to the adherend and the surface adhesive strength.

The tackifier resin contained in the acrylic pressure-sensitive adhesive resin is not particularly limited and may be appropriately selected depending on the intended purpose. However, a softening point of 30 ° C. to 180 ° C. is preferable, and 70 ° C. to 70 ° C. The one at 140 ° C. is more preferable for forming an adhesive layer having high adhesive performance. When a (meth) acrylate-based tackifier resin is used, the glass transition temperature thereof is preferably 30 ° C. to 200 ° C., more preferably 50 ° C. to 160 ° C.

Specific examples of the pressure-sensitive adhesive resin contained in the acrylic pressure-sensitive adhesive resin include a rosin-based pressure-sensitive adhesive resin, a polymerized rosin-based pressure-sensitive adhesive resin, a polymerized rosin-based pressure-sensitive adhesive resin, a rosin-phenol-based pressure-sensitive adhesive resin, and a stabilized rosin ester. Adhesive-imparting resin, disproportionate rosin ester-based adhesive-imparting resin, hydrogenated rosin ester-based adhesive-imparting resin, terpene-based adhesive-imparting resin, terpenphenol-based adhesive-imparting resin, petroleum resin-based adhesive-imparting resin, (meth) acrylate-based adhesive Examples include the imparting resin. These may be used alone or in combination of two or more. Among these, the tackifier resins include polymerized rosin ester-based tackifier resins, rosinphenol-based tackifier resins, disproportionate rosin ester-based tackifier resins, hydrogenated rosin ester-based tackifier resins, and terpenphenol-based resins. Meta) Acrylate-based resin is preferable.

The amount of the tackifier resin used is not particularly limited and may be appropriately selected depending on the intended purpose, but it is used in the range of 5 parts by weight to 65 parts by weight with respect to 100 parts by weight of the acrylic polymer. It is preferable, and it is more preferable to use it in the range of 8 parts by weight to 55 parts by weight because it is easy to secure the adhesion with the adherend.

As the acrylic pressure-sensitive adhesive resin, it is preferable to use a resin containing a cross-linking agent in order to further improve the cohesive force of the pressure-sensitive adhesive layer.

The cross-linking agent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, metal chelate-based cross-linking agents, and aziridine-based cross-linking agents. These may be used alone or in combination of two or more. Among these, the cross-linking agent is preferably a type of cross-linking agent that is mixed after the production of the acrylic polymer to allow the cross-linking reaction to proceed, and an isocyanate-based cross-linking agent and an epoxy-based cross-linking agent having high reactivity with the acrylic polymer are used. It is more preferable to do so.

Examples of the isocyanate-based cross-linking agent include tolylene diisocyanate, triphenylmethane isocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and trimethylolpropane-modified tolylene diisocyanate. These may be used alone or in combination of two or more. Among these, tolylene diisocyanate, which is a trifunctional polyisocyanate compound, trimethylolpropane adduct thereof, and triphenylmethane isocyanate are particularly preferable.

As an index of the degree of cross-linking, the value of the gel fraction for measuring the insoluble content after immersing the adhesive layer in toluene for 24 hours is used. The gel fraction of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 10% by weight to 70% by weight, more preferably 25% by weight to 65% by weight, and 35% by weight. By weight% to 60% by weight is more preferable for obtaining an adhesive layer having good cohesiveness and adhesiveness.

The gel fraction refers to a value measured by the following method. The pressure-sensitive adhesive resin and, if necessary, a pressure-sensitive adhesive composition containing the additive are applied onto the release sheet so that the thickness after drying is 50 μm, dried at 100 ° C. for 3 minutes, and dried at 40 ° C. Aged for 2 days in the above, cut into 50 mm squares, and this is used as a sample. Next, the weight (G1) of the sample before immersion in toluene is measured in advance, and the toluene-insoluble component of the sample after being immersed in a toluene solution at 23 ° C. for 24 hours is separated by filtering with a 300 mesh wire net. Then, the weight (G2) of the residue after drying at 110 ° C. for 1 hour is measured, and the gel fraction is determined according to the following formula (4). The weight (G3) of the conductive fine particles in the sample is calculated from the weight of the sample (G1) and the composition of the pressure-sensitive adhesive composition.
Gel fraction (% by weight) = (G2-G3) / (G1-G3) x 100 ... Equation (4)

--Rubber adhesive resin ---
The rubber-based pressure-sensitive adhesive resin is not particularly limited, and is a rubber material that can be generally used as a pressure-sensitive adhesive resin such as a synthetic rubber-based pressure-sensitive adhesive resin or a natural rubber-based pressure-sensitive adhesive resin, and if necessary, a tack-imparting resin or the like. Examples include those containing the above additives.

Examples of the rubber material include a block copolymer of a polyaromatic vinyl compound and a conjugated diene compound; a styrene-isoprene copolymer, a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, and styrene. Examples thereof include styrene-based resins such as -ethylene-butylene copolymer and styrene-ethylene-propylene copolymer. These may be used alone or in combination of two or more. Among these, the styrene-based resin is preferable, and it is more preferable to use two or more of the styrene-based resins in combination because it is possible to impart excellent adhesive properties and holding power to the pressure-sensitive adhesive sheet, and the styrene-isoprene copolymer weight is more preferable. It is particularly preferable to use the coalescence in combination with a styrene-isoprene-styrene copolymer.

As the styrene resin, for example, a single structure having a linear structure, a branched structure, or a multi-branched structure may be used, or a mixture of different structures may be used. When the styrene resin having abundant linear structure is used for the adhesive layer, excellent adhesive performance can be given to the adhesive sheet. On the other hand, a branched structure or a multi-branched structure in which a styrene block is arranged at the molecular end can have a pseudo-crosslinked structure and can give an excellent cohesive force, so that a high holding force can be given. can. Therefore, it is preferable to mix and use the styrene-based resin according to the required characteristics.

As the styrene-based resin, it is preferable to use one having a structural unit represented by the following chemical formula (1) in the range of 10% by weight to 80% by weight with respect to the total weight of the styrene-based resin. It is more preferable to use the one having in the range of 12% by weight to 60% by weight, further preferably to use the one having in the range of 15% by weight to 40% by weight, and in the range of 17% by weight to 35% by weight. It is particularly preferable to use the one that has. Thereby, excellent adhesiveness and heat resistance can be obtained.

When the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer are used in combination as the styrene resin, the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer are used. The content of the styrene-isoprene copolymer with respect to the total weight is preferably 0% by weight to 80% by weight, more preferably 0% by weight to 77% by weight, and 0% by weight to 75% by weight. It is more preferably 0% by weight to 70% by weight, and particularly preferably 0% by weight to 70% by weight. When the content of the styrene-isoprene copolymer is within the preferable range, it is possible to achieve both excellent adhesive performance and thermal durability for the pressure-sensitive adhesive sheet.

Further, as the styrene-isoprene copolymer, one having a weight average molecular weight in the range of 10,000 to 800,000 measured in terms of standard polystyrene using a gel permeation chromatograph (GPC) may be used. It is preferable to use one in the range of 30,000 to 500,000, and even more preferably to use one in the range of 50,000 to 300,000. When the weight average molecular weight of the styrene-isoprene copolymer is within the above-mentioned preferable range, heat fluidity and compatibility at the time of solvent dilution can be ensured, so that workability in the manufacturing process is good and thermal durability is good. It is preferable because the pressure-sensitive adhesive sheet provided with the above can be obtained.

Here, the measurement of the weight average molecular weight of the styrene-isoprene copolymer by the GPC method is a standard polystyrene-equivalent value measured using a GPC apparatus (SC-8020, manufactured by Tosoh Corporation), and the measurement conditions are: It is as follows.
[Measurement condition]
-Sample concentration: 0.5% by weight (tetrahydrofuran solution)
-Sample injection volume: 100 μL
・ Eluent: tetrahydrofuran ・ Flow rate: 1.0 mL / min ・ Measurement temperature: 40 ° C
-This column: TSKgel (registered trademark) GMHHR-H (20) 2 pieces-Guard column: TSKgel HXL-H
・ Detector: Differential refractometer ・ Standard polystyrene molecular weight: 10,000 to 20 million (manufactured by Tosoh Corporation)

The method for producing the styrene-isoprene copolymer is not particularly limited and may be appropriately selected from conventionally known production methods. For example, a method for sequentially polymerizing a styrene block and an isoprene block by an anion living polymerization method. And so on.

The method for producing the styrene-isoprene-styrene copolymer is not particularly limited and may be appropriately selected from conventionally known production methods. For example, styrene blocks and isoprene blocks are sequentially polymerized by an anion living polymerization method. Examples thereof include a method of producing a block copolymer having a living active terminal and then reacting with a coupling agent to produce a coupled block copolymer.

The method for producing the mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer is not particularly limited and may be appropriately selected from conventionally known production methods. For example, the method. Examples thereof include a method of mixing the styrene-isoprene copolymer produced in 1 and the styrene-isoprene-styrene copolymer.

Further, as a method for producing a mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer, it is also possible to produce the mixture as the mixture at the same time in one polymerization step.
As a more specific embodiment, first, a polystyrene block having a living active terminal is formed by polymerizing a styrene monomer in a polymerization solvent using an anionic polymerization initiator by an anionic living polymerization method. .. Second, isoprene is polymerized from the living-active terminal of the polystyrene block to obtain a styrene-isoprene block copolymer having a living-active terminal. Third, a part of the styrene-isoprene block copolymer having a living active terminal is reacted with a coupling agent to form a coupled styrene-isoprene-styrene block copolymer. Fourth, the rest of the styrene-isoprene block copolymer having a living active end is deactivated by using a polymerization inhibitor to deactivate the living active end, and the styrene-isoprene block copolymer is used. To form.

The tackifier resin contained in the rubber-based pressure-sensitive adhesive resin is not particularly limited and may be appropriately selected depending on the intended purpose, but it is preferable to use a tackifier resin having a softening point of 80 ° C. or higher. Thereby, the pressure-sensitive adhesive sheet having excellent initial adhesiveness and thermal durability can be obtained.

As the tackifier resin, preferably those solid at room temperature (23 ° C.), and specific examples thereof, C ₅ petroleum resins, C ₉ petroleum resins, C ₅ based / C ₉ petroleum resins, alicyclic Examples thereof include petroleum resins such as group petroleum resins, polymerized rosin-based resins, terpene-based resins, rosin-based resins, terpene-phenol resins, styrene resins, kumaron-inden resins, xylene resins, and phenol resins. These may be used alone or in combination of two or more. Among them, as the tackifier resin, the combined use of said C ₅ petroleum resins and polymerized rosin resin, preferable for both the more excellent initial adhesion and heat resistance.

The petroleum resin is easily compatible with the structural unit represented by the chemical formula (1) constituting the styrene resin, and as a result, the initial adhesive strength and thermal durability of the pressure-sensitive adhesive sheet are further improved. Can be done.

Examples of the _{C 5} petroleum resins, for example, Escorez 1202, Escorez 1304, Escorez 1401 (manufactured by Exxon Mobil Corporation), Wing Tack 95 (manufactured by Goodyear Tire & Rubber Company), Quinton K100, Quinton R100, Examples thereof include Quinton F100 (manufactured by Nippon Zeon Corporation), Pico Tack 95, and Pico Pale 100 (manufactured by Rika Hercules Co., Ltd.).

Examples of the _{C 9} petroleum resin, for example, Nippon Oil Neo Polymer L-90, Nippon neo polymer 120, Nisseki Neo Polymer 130, Nisseki Neo Polymer 140, Nisseki Neo Polymer 150, Nisseki Neo Polymer 170S, Japan Stone Neopolymer 160, Nisseki Neopolymer E-100, Nisseki Neopolymer E-130, Nisseki Neopolymer 130S, Nisseki Neopolymer S (all manufactured by JX Nisseki Energy Co., Ltd.), Petcol (registered trademark) (Manufactured by Toso Co., Ltd.) and the like.

As the C ₅ series / C ₉ series petroleum resin, a copolymer of the C ₅ series petroleum resin and the C ₉ series petroleum resin can be used, for example, Escolets 2101 (manufactured by ExxonMobil Corporation). Quinton G115 (manufactured by ZEON CORPORATION), Harcotac 1149 (manufactured by Rika Hercules Co., Ltd.) and the like can be used.

As the alicyclic petroleum resin, can be obtained by hydrogenating the C ₉ petroleum resin, for example, (manufactured by Exxon Mobil Corporation) Escorez 5300, Arkon P-100 (manufactured by Arakawa Chemical Industries, Ltd.), Rigalite R101 (manufactured by Rika Hercules Co., Ltd.) and the like can be mentioned.

The amount of the tackifier resin used is not particularly limited and may be appropriately selected depending on the intended purpose, but is 0% by weight to 100% by weight based on the total amount of the components constituting the rubber-based pressure-sensitive adhesive resin. It is preferable to use it in the range of 0% by weight to 70% by weight, more preferably it is used in the range of 0% by weight to 50% by weight, and it is more preferably used in the range of 0% by weight to 30% by weight. It is particularly preferable to use in the range of. By using the tackifier resin within the preferable range, it is easy to achieve both excellent breaking point elongation and thermal durability of the pressure-sensitive adhesive sheet while enhancing the interfacial adhesion between the pressure-sensitive adhesive layer and the base material layer. Become.

The amount of the tackifier resin having a softening point of 80 ° C. or higher is not particularly limited and may be appropriately selected depending on the intended purpose, but is 3% by weight to 100% by weight based on the total amount of the styrene resin. It is preferable to use it in the range of%, more preferably in the range of 5% by weight to 80% by weight, and even more excellent adhesiveness and excellent use in the range of 5% by weight to 80% by weight. It is particularly preferable to obtain the pressure-sensitive adhesive sheet having both thermal durability.

Further, for the purpose of obtaining adhesiveness and initial adhesiveness in a constant temperature environment, a tackifier resin having a softening point of −5 ° C. or lower can be used in combination with a tackifier resin having a softening point of 80 ° C. or higher. ..

The tackifier resin having a softening point of −5 ° C. or lower is not particularly limited and may be appropriately selected from the known tackifier resins according to the purpose, but a tackifier resin liquid at room temperature is used. It is preferable to do so.

Specific examples of the tackifier resin having a softening point of −5 ° C. or lower include process oil, polyester, liquid rubber such as polybutene, and the like. These may be used alone or in combination of two or more. Among these, it is preferable to use polybutene for the tackifier resin having a softening point of −5 ° C. or lower in order to exhibit even more excellent initial adhesiveness.

The tackifier resin having a softening point of −5 ° C. or lower is preferably used in the range of 0% by weight to 40% by weight, preferably in the range of 0% by weight to 30% by weight, based on the total amount of the tackifier resin. It is more preferable to use it.

The tackifier resin having a softening point of −5 ° C. or lower is preferably used in the range of 0% by weight to 40% by weight, preferably 0% by weight to 30% by weight, based on the total amount of the styrene-based resin. It is more preferable to use the product in the above range because the initial adhesive strength can be improved, good adhesion can be obtained, and sufficient thermal durability can be obtained.

The weight ratio of the tackifier resin having a softening point of 80 ° C. or higher and the tackifier resin having a softening point of −5 ° C. or lower is not particularly limited and may be appropriately selected depending on the intended purpose. The weight of the tackifier resin having a point of 80 ° C. or higher / the weight of the tackifier resin having a softening point of −5 ° C. or lower] It is preferable to use the adhesive-imparting resin in a weight ratio of 5 to 50, and using it in a range of 10 to 30 achieves both excellent initial adhesiveness and excellent holding power. More preferable for obtaining an adhesive sheet.

The weight ratio of the styrene-based resin to the tack-imparting resin is not particularly limited and may be appropriately selected depending on the intended purpose, but is represented by [styrene-based resin / tack-imparting resin]. The weight ratio of the styrene-based resin to the resin is preferably in the range of 0.5 to 10.0, and the use in the range of 0.6 to 9.0 improves the initial adhesive strength. It is more preferable because it can be used and excellent thermal durability can be obtained. Further, the weight ratio [styrene resin / adhesive resin] is larger than 1, for example, to prevent peeling due to the repulsive force of the adhesive sheet when it is attached to a curved surface portion of an adherend (for example). It is preferable for (repulsion resistance).

-Other ingredients-
The other components in the pressure-sensitive adhesive composition are not particularly limited and may be appropriately selected as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired. For example, polymer components other than the pressure-sensitive adhesive resin, filler particles, and cross-linking can be selected. Agents, anti-aging agents, UV absorbers, fillers, polymerization inhibitors, surface conditioners, antistatic agents, defoaming agents, viscosity modifiers, light-resistant stabilizers, weather-resistant stabilizers, heat-resistant stabilizers, antioxidants, leveling Examples thereof include additives such as agents, organic pigments, inorganic pigments, pigment dispersants, plasticizers, softeners, flame retardants, and metal deactivators. These may be used alone or in combination of two or more. Among these, it is preferable to include the filler particles.
The content of the other components in the pressure-sensitive adhesive layer can be appropriately selected as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired.

Since the pressure-sensitive adhesive layer contains the filler particles, the filler particles are exposed from the pressure-sensitive adhesive layer when the pressure-sensitive adhesive sheet is stretched, thereby reducing the adhesive area between the pressure-sensitive adhesive layer and the adherend. It is advantageous in that the pressure-sensitive adhesive sheet can be easily stretched and peeled off even if the stretch direction of the pressure-sensitive adhesive sheet is perpendicular to the sticking surface (adhesive surface) of the adherend.

The type of the filler particles is not particularly limited and may be appropriately selected as long as the effects of the present invention are not impaired, and may be inorganic filler particles or organic filler particles. These may be used alone or in combination of two or more.

Specific examples of the inorganic filler particles include aluminum hydroxide, magnesium hydroxide, aluminum oxide, silicon oxide, magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, iron oxide, silicon carbide, boron nitride, aluminum nitride, and titanium nitride. , Silicon nitride, titanium borodate, carbon, nickel, copper, aluminum, titanium, gold, silver, zirconium hydroxide, basic magnesium carbonate, dolomite, hydrotalcite, calcium hydroxide, barium hydroxide, tin oxide, tin oxide Hydrate, borosand, zinc borate, zinc metaborate, barium metaborate, zinc carbonate, magnesium carbonate-calcium, calcium carbonate, barium carbonate, molybdenum oxide, antimony oxide, red phosphorus, mica, clay, kaolin, talc, Zeolite, wollastonite, smectite, silica (quartz, fumed silica, precipitated silica, silicic anhydride, molten silica, crystalline silica, ultrafine atypical silica, etc.), potassium titanate, magnesium sulfate, sepiolite, zonolite, Aluminum borate, barium sulfate, barium titanate, zirconia, zirconia oxide, cerium, tin, indium, carbon, sulfur, terium, cobalt, molybdenum, strontium, chromium, barium, lead, tin oxide, indium oxide, diamond, magnesium, Examples include platinum, zinc, manganese, stainless steel, and antimony pentoxide. Among these, aluminum hydroxide, nickel and the like are preferable.
Further, the inorganic filler may be subjected to a surface treatment such as a silane coupling treatment or a stearic acid treatment in order to improve the dispersibility in the pressure-sensitive adhesive resin.

Specific examples of the organic filler particles include polystyrene-based fillers, benzoguanamine-based fillers, polyethylene-based fillers, polypropylene-based fillers, silicone-based fillers, urea-formalin-based fillers, styrene / methacrylic acid copolymers, fluorine-based fillers, and acrylic-based fillers. Examples thereof include fillers, polycarbonate-based fillers, polyurethane-based fillers, polyamide-based fillers, epoxy resin-based fillers, and thermocurable resin-based hollow fillers.

The shape of the filler particles is not particularly limited and may be appropriately selected depending on the intended purpose, and may be a regular shape or an irregular shape. Specific examples of the shape of the filler particles include a polygonal shape, a cubic shape, an elliptical shape, a spherical shape, a needle shape, a flat plate shape, and a scale shape. The filler particles having these shapes may be used alone or in combination of two or more. Further, the filler particles having these shapes may be aggregated. Among these, the shape of the filler particles is preferably elliptical, spherical, or polygonal. When the filler particle shape is an elliptical shape, a spherical shape, a polygonal shape, or the like, when the pressure-sensitive adhesive sheet is stretched, the pressure-sensitive adhesive layer slides well to the adherend, and the pressure-sensitive adhesive sheet is stretched. Can be easily stretched and peeled off even in the 90 ° direction with respect to the sticking surface of the adherend.

The particle size distribution (D ₉₀ / D ₁₀ ) of the filler particles is not particularly limited and may be appropriately selected depending on the intended purpose, but 2.5 to 20 is preferable, and in terms of impact resistance, 2. 5 to 15 is more preferable, and 2.5 to 5 is even more preferable. When the particle size distribution (D ₉₀ / D ₁₀ ) of the filler particles is within the preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend. Even when the base material of the pressure-sensitive adhesive sheet is thin, it is difficult to tear and has excellent impact resistance, shear adhesive strength, and split adhesive strength. On the other hand, when the particle size distribution (D ₉₀ / D ₁₀ ) of the filler particles is less than 2.5, the adhesive sheet is stretched and peeled off when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the sticking surface of the adherend. The property may be impaired, and if it exceeds 20, the adhesive performance such as impact resistance, shear adhesive force, and split adhesive force may be impaired.
The particle size distribution of the filler particles (D ₉₀ / D ₁₀ ) is converted into a particle size distribution by measuring the particle size of the filler particles by using, for example, a measuring machine (microtrack) using a laser diffraction / scattering method. Obtained by doing.

The volume average particle diameter of the filler particles is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3 μm to 25 μm, more preferably 5 μm to 20 μm, still more preferably 5 μm to 14 μm. When the volume average particle size of the filler particles is within the preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled off even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend. Even when the thickness of the base material is thin, it is hard to tear and has excellent impact resistance, shear adhesive strength, and split adhesive strength. On the other hand, if the volume average particle size of the filler particles is less than 3 μm, it may be difficult to stretch and peel off the pressure-sensitive adhesive sheet when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend. If it exceeds 25 μm, the adhesive performance such as impact resistance, shear adhesive force, and split adhesive force may be impaired.
The volume average particle diameter of the filler particles can be measured, for example, by using a measuring machine (microtrack) using a laser diffraction / scattering method.

The ratio of the volume average particle size of the filler particles to the average thickness of the adhesive layer described later is not particularly limited and may be appropriately selected depending on the intended purpose. The ratio of the volume average particle diameter of the filler particles to the average thickness of the adhesive layer represented by [average thickness of the layer] is preferably 5/100 or more, and is preferably 5/100 to 95/100. Is more preferable, 10/100 to 75/100 is further preferable, and 20/100 to 60/100 is particularly preferable. When the ratio is within the preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend, and the thickness of the base material of the pressure-sensitive adhesive sheet is thin. Even in some cases, it is hard to tear. Further, when the ratio is within the particularly preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend, and the base material of the pressure-sensitive adhesive sheet can be easily stretched and peeled off. It is advantageous in that it is hard to tear even when the thickness is thin, and the adhesive performance such as impact resistance, shear adhesive force, and split adhesive force is more excellent. On the other hand, if the ratio is less than 5/100, the stretchability when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the sticking surface of the adherend may be impaired, and exceeds 95/100. In addition, the adhesive performance such as impact resistance, shear adhesive force, and split adhesive force may be impaired.

The content of the filler particles in the pressure-sensitive adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is 10 parts by weight to 90 parts by weight with respect to 100 parts by weight of the pressure-sensitive adhesive resin. It is more preferable, it is more preferably 15 parts by mass to 50 parts by mass, and further preferably 20 parts by mass to 40 parts by mass. If the content of the filler particles with respect to 100 parts by weight of the pressure-sensitive adhesive resin is less than 10 parts by weight, the pressure-sensitive adhesive sheet cannot be stretched and peeled off when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the sticking surface of the adherend. Alternatively, the pressure-sensitive adhesive sheet may be torn, and the pressure-sensitive adhesive sheet may not stretch and cannot be peeled off again. Further, when the content of the filler particles with respect to 100 parts by weight of the pressure-sensitive adhesive resin exceeds 90 parts by weight, the pressure-sensitive adhesive sheet does not stretch, the pressure-sensitive adhesive composition remains on the adherend, and impact resistance. In addition, the shear adhesive force and the split adhesive force may be weakened. On the other hand, when the content of the filler particles is within the preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled off even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend. It is advantageous in that it is difficult to tear even when the thickness of the base material is thin, and it is excellent in impact resistance, shear adhesive force, and split adhesive force.
The content of the filler particles in the pressure-sensitive adhesive layer can be appropriately adjusted when preparing the pressure-sensitive adhesive composition.

The volume ratio of the filler particles to the volume of the entire pressure-sensitive adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 4% to 40%, more preferably 5% to 30%. 5% to 20% is more preferable, and 5% to 15% is particularly preferable. If the volume ratio of the filler particles is less than 4%, the pressure-sensitive adhesive sheet cannot be stretched and peeled off when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend, or the pressure-sensitive adhesive sheet is torn. May occur, and the adhesive sheet may not stretch and cannot be peeled off again. Further, when the volume ratio of the filler particles exceeds 40%, the pressure-sensitive adhesive sheet does not stretch, the pressure-sensitive adhesive composition remains on the adherend, the impact resistance deteriorates, and shear adhesion occurs. The force and split adhesive force may be weakened. On the other hand, when the volume ratio of the filler particles is within the preferable range, the pressure-sensitive adhesive sheet can be easily stretched and peeled off even if the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the attachment surface of the adherend. It is advantageous in that it is difficult to tear even when the thickness of the base material is thin, and it is excellent in impact resistance, shear adhesive force, and split adhesive force.

The volume ratio of the filler particles to the adhesive layer can be calculated from the following formulas (1) to (3).
Adhesive resin ^{* 1} Weight A (g) / adhesive resin ^{* 1} Density A (g / ^cm 3) = adhesive resin ^{* 1} volume A ^(cm 3) · · · Equation (1)
Filler particle weight B (g) / Filler particle density B (g / cm ³ ) = Filler particle volume B (cm ³ ) ... Equation (2)
Filler particle volume B (cm ³ ) / (Adhesive resin ^{* 1} volume A (cm ³ ) + Filler particle volume B (cm ³ )) x 100 = Filler particle volume ratio (%) ... 3)
^{The pressure-sensitive adhesive resin represented by * 1} in the above formulas (1) and (3) may contain other components described in paragraph [0079] described later.
The density is a value measured according to JIS Z 8804.

The number of the adhesive layers is not particularly limited and may be appropriately selected depending on the purpose of use and the like, and may be arranged on only one side of the adhesive sheet or on both sides. It is preferably arranged on both sides.

-Stress during 25% elongation of the adhesive layer-
The stress at 25% elongation of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.04 MPa to 0.4 MPa, more preferably 0.05 MPa to 0.1 MPa. When the 25% elongation stress of the pressure-sensitive adhesive layer is within the preferable range, a suitable adhesive strength can be obtained as the pressure-sensitive adhesive sheet, and the pressure-sensitive adhesive layer can be peeled off relatively easily even when the pressure-sensitive adhesive layer is stretched and peeled off. On the other hand, when the stress at 25% elongation of the adhesive layer is less than 0.04 MPa, the adhesive sheet is released when a load is generated in the shearing direction of the adhesive sheet while fixing the hard adherends to each other. It may be peeled off, and if it exceeds 0.4 MPa, the force required to stretch the pressure-sensitive adhesive sheet may become excessive when the pressure-sensitive adhesive sheet is peeled off.
The 25% elongation stress of the adhesive layer is obtained by punching the adhesive layer into a dumbbell shape having a marked line length of 20 mm and a width of 10 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a Tencilon tensile tester (model: RTF). -1210 (manufactured by A & D Co., Ltd.), and refers to the stress value measured when pulled in the length direction at a tensile speed of 300 mm / min and stretched by 25%.

− Breaking point stress of adhesive layer −
The breaking point stress of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 MPa to 2.1 MPa, more preferably 1.0 MPa to 2.1 MPa. When the breaking point stress of the pressure-sensitive adhesive layer is within the preferable range, it is possible to prevent the pressure-sensitive adhesive sheet from being torn even when the pressure-sensitive adhesive sheet is stretched and peeled off, and the pressure-sensitive adhesive sheet is stretched. Since the load of the is not excessive, the re-peeling work by peeling becomes easy. On the other hand, if the breaking point stress of the pressure-sensitive adhesive layer is less than 0.5 MPa, the pressure-sensitive adhesive sheet may be torn when the pressure-sensitive adhesive sheet is stretched and peeled off, and if it exceeds 2.1 MPa, the pressure-sensitive adhesive sheet may be torn. When it is stretched and an attempt is made to peel it off again, it may not be stretched sufficiently and it may not be possible to peel it off again. The force required to stretch and deform the pressure-sensitive adhesive sheet also depends on the thickness of the pressure-sensitive adhesive sheet. For example, the pressure-sensitive adhesive sheet having a large thickness and a high breaking point stress is stretched and re-stretched. Even when it is attempted to be peeled off, it may not be sufficiently stretched and cannot be peeled off again.
The breaking point stress of the adhesive layer is such that the adhesive layer is punched into a dumbbell shape having a marked line length of 20 mm and a width of 10 mm, and a tencilon tensile tester (model: RTF-1210) is used under the conditions of a measurement atmosphere of 23 ° C. and 50% RH. , A & D Co., Ltd.), and refers to the stress value measured when the material is pulled in the length direction at a tensile speed of 300 mm / min and fractured.

-Elongation at break point of adhesive layer-
The elongation at break point of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 450% to 1,300%, more preferably 500% to 1,200%, and 600%. % To 1,100% is more preferable. When the breaking point elongation of the adhesive layer is within the preferable range, both suitable adhesiveness and removability can be achieved at the same time.
The elongation at break of the adhesive layer is determined by punching the adhesive layer into a dumbbell shape having a marked line length of 20 mm and a width of 10 mm, and under the conditions of a measuring atmosphere of 23 ° C. and 50% RH, a Tencilon tensile tester (model: RTF-). 1210, manufactured by A & D Co., Ltd.), which is pulled in the length direction at a tensile speed of 300 mm / min and refers to the tensile elongation measured when it breaks.

-Average thickness of adhesive layer-
The average thickness of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5 μm to 150 μm, more preferably 20 μm to 120 μm, and 40 μm to 110 μm. More preferably, it is particularly preferably 50 μm to 100 μm. The "average thickness of the adhesive layer" means the average thickness of the adhesive layer on one surface of the adhesive sheet. When the adhesive layer is provided on both sides of the adhesive sheet, the average thickness of the adhesive layer on one surface and the average thickness of the adhesive layer on the other surface may be the same or different. It may be, but it is preferable that the thickness is the same.
In the present specification, the "average thickness of the adhesive layer" means that the adhesive sheet is cut at five points in the length direction at intervals of 100 mm in the width direction, and each of the cut surfaces is cut at intervals of 100 mm in the width direction. It refers to the average value of the total thickness of 25 points measured by using a TH-104 paper / film thickness measuring machine (manufactured by Tester Sangyo Co., Ltd.) for the total thickness of the adhesive layer of the points.

-How to form an adhesive layer-
The method for forming the adhesive layer is not particularly limited and may be appropriately selected from known methods according to the intended purpose. For example, a heat press method may be applied to at least one surface of the base material layer. Examples thereof include a method of forming the adhesive layer by a method such as a cast method by extrusion molding, a uniaxial stretching method, a sequential secondary stretching method, a simultaneous biaxial stretching method, an inflation method, a tube method, a calendar method, and a solution method. Among these, the cast method and the solution method by extrusion molding are preferable.

Examples of the solution method include a method in which a solution containing the pressure-sensitive adhesive composition is directly applied to the base material layer with a roll coater or the like, a method in which the pressure-sensitive adhesive layer is formed on a release sheet, and then the pressure-sensitive adhesive layer is peeled off and used. Can be mentioned.

The release sheet is not particularly limited and may be appropriately selected depending on the intended purpose. For example, paper such as kraft paper, glassin paper, high-quality paper; polyethylene, polypropylene (biaxially stretched polypropylene (OPP), uniaxially stretched). Resin films such as polypropylene (CPP)) and polyethylene terephthalate (PET); laminated paper in which the paper and the resin film are laminated, and silicone on one or both sides of the paper that has been sealed with clay or polyvinyl alcohol. Examples thereof include those that have been subjected to a peeling treatment such as a based resin. These may be used alone or in combination of two or more.

<< Base material layer >>
The base material layer is not particularly limited and may be appropriately selected from known materials that can be used for the pressure-sensitive adhesive sheet as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired. It is preferable to contain it, and other components may be further contained if necessary.
The base material layer may have a single-layer structure, or may have a multi-layer structure of two layers, three layers, or more.

-Material for base material-
Examples of the base material are styrene-isoprene copolymer, styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene-butylene copolymer, and styrene-ethylene-propylene. Polystyrene-based resins such as polymers; Polyurethane resins such as ester-based polyurethanes and ether-based polyurethanes; Polyolefin resins such as polyethylene and polypropylene; Polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; Polystyrene; Polycarbonate; Polymethylpentene ; Polysulfone; polyether ether ketone; polyether sulfone; polyetherimide; polyimide film; fluororesin; nylon; acrylic resin and the like. These may be used alone or in combination of two or more, but it is preferable to use two or more in combination.
Among these, the styrene resin and the polyurethane resin are preferable because they can easily obtain suitable breaking point elongation and breaking point stress, and the styrene resin is more preferable, and a styrene-isoprene copolymer and a styrene-isoprene-. It is particularly preferable to use it in combination with a styrene copolymer.

--Styrene resin ---
Since the styrene-based resin is a resin exhibiting thermoplasticity, it is excellent in moldability such as extrusion molding and injection molding, and it is easy to mold the base material layer. Further, the styrene-based resin can easily obtain a particularly excellent breaking point elongation in a group of resins generally called a thermoplastic resin, and can be suitably used as a base material for the pressure-sensitive adhesive sheet.

Therefore, in the material for the base material, the ratio of the styrene resin to the total resin component is preferably 50% to 100%, more preferably 60% to 100%, still more preferably 65% to 100%. , 70% to 100% is particularly preferable. When the ratio of the styrene-based resin is within the preferable range, a base material layer having excellent breaking point elongation and breaking point stress can be obtained.

As the styrene resin, for example, a single structure having a linear structure, a branched structure, or a multi-branched structure may be used, or a mixture of different structures may be used. The styrene-based resin having abundant linear structure can impart excellent breaking point elongation to the base material layer. On the other hand, a branched structure or a multi-branched structure in which a styrene block is arranged at the molecular end can have a pseudo-crosslinked structure and can provide excellent cohesive force. Therefore, it is preferable to mix and use the styrene-based resin according to the required mechanical properties.

As the styrene-based resin, it is preferable to use one having the structural unit represented by the chemical formula (1) in the range of 13% by weight to 60% by weight with respect to the total weight of the styrene-based resin. It is more preferable to use one having a weight in the range of 15% by weight to 50% by weight, further preferably to use one having a weight in the range of 15% by weight to 45% by weight, and having a weight in the range of 15% by weight to 35% by weight. It is particularly preferable to use one. When the ratio of the structural unit represented by the following chemical formula (1) to the total weight of the styrene resin is within the preferable range, it becomes easy to obtain the breaking point elongation and the breaking point stress in the preferable range.

When the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer are used in combination as the styrene resin, the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer are used. The content of the styrene-isoprene copolymer with respect to the total weight is preferably 0% by weight to 80% by weight, more preferably in the range of 0% by weight to 70% by weight, and 0% by weight to 50% by weight. It is more preferably 0% by weight to 30% by weight, and particularly preferably 0% by weight to 30% by weight. When the content of the styrene-isoprene copolymer is within the above-mentioned preferable range, it is possible to achieve both thermal durability while maintaining excellent breaking point elongation and breaking point stress.

Further, as the styrene-isoprene copolymer, one having a weight average molecular weight in the range of 10,000 to 800,000 measured in terms of standard polystyrene using a gel permeation chromatograph (GPC) may be used. It is preferable to use one in the range of 30,000 to 500,000, and even more preferably to use one in the range of 50,000 to 300,000. When the weight average molecular weight of the styrene-isoprene copolymer is within the above-mentioned preferable range, heat fluidity and compatibility at the time of solvent dilution can be ensured, so that workability in the manufacturing process is good and thermal durability is good. It is preferable because the base material layer provided with the above can be obtained.
The measurement of the weight average molecular weight of the styrene-isoprene copolymer by the GPC method is the same as the method described in the item "-Rubber-based pressure-sensitive adhesive resin-".

The method for producing the styrene-isoprene copolymer, the styrene-isoprene-styrene copolymer, and the mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer is not particularly limited. It can be appropriately selected from conventionally known production methods, and examples thereof include the same methods as those described in the above item "-Rubber-based pressure-sensitive adhesive resin-".

--Polyurethane resin ---
The polyurethane resin is not particularly limited and may be appropriately selected depending on the intended purpose, but a polyurethane resin having a softening point of 40 ° C. or higher is preferable, and a polyurethane resin having a softening point of 50 ° C. or higher is more preferable. The upper limit of the softening point is preferably 100 ° C. or lower. The softening point refers to a value measured according to JIS K 2207 (dry-bulb type) (hereinafter, the same applies to the softening point).

As the polyurethane resin, a reaction product of a polyol (b1-1) and a polyisocyanate (b1-2) can be preferably used.

The polyol (b1-1) is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include polyester polyols, polyether polyols, polycarbonate polyols and acrylic polyols. These may be used alone or in combination of two or more. Among these, as the polyol (b1-1), a polyester polyol and a polyether polyol are preferable because the mechanical properties of the base material layer can be obtained. In the base material layer, it is preferable to use a polyester polyol when heat resistance is required, and it is preferable to use a polyether polyol when water resistance and biodegradability are required.

Examples of the polyester polyol include a polyester obtained by esterifying a low molecular weight polyol and a polycarboxylic acid, a polyester obtained by ring-opening polymerization reaction of a cyclic ester compound such as ε-caprolactone, and a copolymerization thereof. Examples include polyester.

Examples of the low molecular weight polyol that can be used for producing the polyester polyol include ethylene glycol, propylene glycol, 1,4-butanediol, and 1,6-hexanediol having a weight average molecular weight of about 50 to 300. , Diethylene glycol, neopentyl glycol, aliphatic alkylene glycols such as 1,3-butanediol, cyclohexanedimethanol and the like can be used.

Examples of the polycarboxylic acid include aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid; aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid and naphthalenedicarboxylic acid; and theirs. Examples thereof include anhydrides and esterified products.

Examples of the polyether polyol include those obtained by addition polymerization of an alkylene oxide using one or more compounds having two or more active hydrogen atoms as an initiator.

As the polycarbonate polyol, for example, one obtained by reacting a carbonic acid ester and / or phosgene with a low molecular weight polyol described later can be used.

Examples of the carbonic acid ester include methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate and the like.

Examples of low molecular weight polyols that can react with the carbonate ester and / or phosgen that can be used in the production of the polycarbonate polyol include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, and the like. 1,3-Propanediol, dipropylene glycol, tripropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2,5-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1, , 11-Undecanediol, 1,12-dodecanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol, 3-methyl-1,5 -Pentanediol, 2-ethyl-1,3-hexanediol, 2-methyl-1,8-octanediol, 1,4-cyclohexanedimethanol, hydroquinone, resorcin, bisphenol A, bisphenol F, 4,4'-biphenol And so on.

The polyisocyanate (b1-2) is not particularly limited and may be appropriately selected depending on the intended purpose. For example, an alicyclic polyisocyanate, an aliphatic polyisocyanate, an aromatic polyisocyanate or the like can be used. It is possible, and examples thereof include alicyclic polyisocyanates. These may be used alone or in combination of two or more.

Examples of the alicyclic polyisocyanate include isophorone diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, 4,4'-dicyclohexylmethanediisocyanate, 2,4-methylcyclohexanediisocyanate, and 2,6-methylcyclohexanediisocyanate. , Cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, bis (2-isosianatoethyl) -4-cyclohexylene-1,2-dicarboxylate, 2,5-norbornane diisocyanate, 2,6-norbornane diisocyanate, dimerate diisocyanate, Bicycloheptane triisocyanate and the like can be mentioned. These may be used alone or in combination of two or more.

The method for producing the polyurethane resin (b1) by reacting the polyol (b1-1) with the polyisocyanate (b1-2) is not particularly limited and may be appropriately selected from conventionally known production methods. For example, the polyol (b1-1) charged in the reaction vessel is heated under normal pressure or reduced pressure conditions to remove water, and then the polyisocyanate (b1-2) is collectively or divided. Examples include a method of supplying and reacting.

The reaction between the polyol (b1-1) and the polyisocyanate (b1-2) involves the isocyanate group (NCO) of the polyisocyanate (b1-2) and the hydroxyl group (OH) of the polyol (b1-1). ) And the equivalent ratio (NCO / OH equivalent ratio) is preferably in the range of 1.0 to 20.0, more preferably in the range of 1.1 to 13.0, and 1.2 to 5 It is more preferably carried out in the range of .0, and particularly preferably carried out in the range of 1.5 to 3.0.

The reaction conditions between the polyol (b1-1) and the polyisocyanate (b1-2) are not particularly limited and may be appropriately selected in consideration of various conditions such as safety, quality and cost, but the reaction The temperature is preferably 70 ° C. to 120 ° C., and the reaction time is preferably 30 minutes to 5 hours.

When the polyol (b1-1) is reacted with the polyisocyanate (b1-2), for example, a tertiary amine catalyst, an organometallic catalyst or the like can be used as a catalyst, if necessary. ..

Further, the reaction may be carried out in a solvent-free environment or in the presence of an organic solvent.
The organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, ester solvents such as methyl acetate, ethyl acetate, propyl acetate and butyl acetate; acetone, methyl ethyl ketone, methyl butyl ketone and cyclohexanone. Ketone-based solvents such as; ether ester-based solvents such as methyl cellosolve acetate and butyl cellosolve acetate; aromatic hydrocarbon-based solvents such as toluene and xylene; amide-based solvents such as dimethylformamide and dimethylacetamide. These may be used alone or in combination of two or more.
The organic solvent may be removed during the production of the polyurethane resin (b1) or after the polyurethane (b1) is produced by an appropriate method such as heating under reduced pressure or drying at normal pressure.

--Other ingredients ---
The other components in the base material layer are not particularly limited and may be appropriately selected as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired. For example, a tackifier resin; a polymer component other than the base material for the base material; Cross-linking agent, anti-aging agent, ultraviolet absorber, filler, polymerization inhibitor, surface conditioner, antistatic agent, defoaming agent, viscosity modifier, light-resistant stabilizer, weather-resistant stabilizer, heat-resistant stabilizer, antioxidant, Additives such as leveling agents, organic pigments, inorganic pigments, pigment dispersants, silica beads and organic beads; inorganic fillers such as silicon oxide, aluminum oxide, titanium oxide, zirconia and antimony pentoxide can be mentioned. These may be used alone or in combination of two or more.
The content of the other components in the base material layer can be appropriately selected as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired.

The tackifier resin can be used for the purpose of enhancing the adhesion between the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet and the base material layer and improving heat resistance.

The tackifier resin is not particularly limited and may be appropriately selected depending on the intended purpose. However, the softening point is preferably 80 ° C. or higher, more preferably 90 ° C. or higher, and 100 ° C. or higher. Is more preferable, and those having a temperature of 110 ° C. or higher are particularly preferable.

As the tackifier resin, for example, those described in the item of "-rubber-based pressure-sensitive adhesive resin-" can be used, and the preferred embodiment is also the same.

The anti-aging agent is not particularly limited and may be appropriately selected from known ones according to the purpose. For example, a phenol-based anti-aging agent and a phosphorus-based anti-aging agent (referred to as “processing stabilizer”). ), Amine-based anti-aging agents, imidazole-based anti-aging agents, etc. These may be used alone or in combination of two or more. Among these, the phenol-based anti-aging agent and the phosphorus-based anti-aging agent are preferable, and the combined use of these can effectively improve the heat-resistant stability of the base material, and as a result, the heat-resistant stability of the base material can be effectively improved. It is preferable because it is possible to obtain an adhesive sheet that maintains good initial adhesiveness and has even better thermal durability. Since the phosphorus-based antiaging agent may slightly discolor (yellow) over time in a high temperature environment, the amount used balances the initial adhesiveness, thermal durability, and discoloration prevention. It is preferable to take it into consideration and set it appropriately.

As the phenolic antiaging agent, a phenolic compound having a steric hindrance group can be generally used, and monophenolic type, bisphenol type and polyphenol type are typical. Specific examples include 2,6-di-t-butyl-4-methylphenol, 2,2'-methylenebis (4-methyl-6-t-butylphenol), and 2,2'-methylenebis (4-ethyl-6). -T-butylphenol), 4,4'-thiobis (6-t-butyl-3-methylphenol), 4,4'-butylidenebis- (3-methyl-6-t-butylphenol), tetrakis- [methylene-3 -(3'5'-di-t-butyl-4-hydroxyphenyl) propionate] Methyl, n-octadecyl-3- (4'-hydroxy-3'5'-di-t-butylphenyl) propionate, etc. Be done. These may be used alone or in combination of two or more.

The amount of the phenolic antiaging agent to be used is not particularly limited and may be appropriately selected depending on the intended purpose, but is 0.1 part by weight to 5 parts by weight with respect to 100 parts by weight of the base material. It is preferably used in the range, and using it in the range of 0.5 parts by weight to 3 parts by weight can effectively improve the heat resistance stability of the base material, and as a result, a good initial stage is obtained. It is possible to obtain an adhesive sheet that maintains adhesiveness and has even better thermal durability.

-Stress during 25% elongation of the substrate layer-
The stress at 25% elongation of the base material layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.2 MPa to 10.0 MPa, more preferably 0.2 MPa to 5.0 MPa. , 0.2 MPa to 3.0 MPa, more preferably 0.2 MPa to 2.0 MPa. When the 25% elongation stress of the base material layer is within the preferable range, an adhesive strength suitable for the pressure-sensitive adhesive sheet can be obtained, and the adhesive sheet can be relatively easily peeled off even when stretched and peeled off. .. On the other hand, when the stress at 25% elongation of the base material layer is less than 0.2 MPa, the pressure-sensitive adhesive sheet is subjected to a load in the shearing direction of the pressure-sensitive adhesive sheet while fixing the hard adherends to each other. If it exceeds 10.0 MPa, the force required to stretch the pressure-sensitive adhesive sheet may become excessive when the pressure-sensitive adhesive sheet is peeled off.
The 25% elongation stress of the base material layer is obtained by punching the base material layer into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a tencilon tensile tester (model). : RTF-1210, manufactured by A & D Co., Ltd.), and refers to the stress value measured when pulled in the length direction at a tensile speed of 500 mm / min and stretched by 25%.

− Breaking point stress of substrate layer −
The breaking point stress of the base material layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1.5 MPa to 100.0 MPa, more preferably 7.0 MPa to 50.0 MPa, and 7 It is more preferably 0.0 MPa to 40.0 MPa, and particularly preferably 8.0 MPa to 35.0 MPa. When the breaking point stress of the base material layer is within the preferable range, it is possible to prevent the pressure-sensitive adhesive sheet from being torn even when the pressure-sensitive adhesive sheet is stretched and peeled off, and the pressure-sensitive adhesive sheet is stretched. Since the load for this is not excessive, the re-peeling work by peeling becomes easy. On the other hand, if the breaking point stress of the base material layer is less than 1.5 MPa, the adhesive sheet may be torn when the adhesive sheet is stretched and peeled off, and if it exceeds 100.0 MPa, the adhesive sheet may be torn. When the sheet is stretched and attempted to be peeled off again, it may not be sufficiently stretched and may not be peeled off again. The force required to stretch and deform the pressure-sensitive adhesive sheet also depends on the thickness of the pressure-sensitive adhesive sheet. For example, the pressure-sensitive adhesive sheet having a large thickness and a high breaking point stress is stretched and re-stretched. Even when it is attempted to be peeled off, it may not be sufficiently stretched and cannot be peeled off again.
The breaking point stress of the base material layer is such that the base material layer is punched into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm, and a tencilon tensile tester (model: RTF) is used under the conditions of a measurement atmosphere of 23 ° C. and 50% RH. -1210 (manufactured by A & D Co., Ltd.), pulled in the length direction at a tensile speed of 500 mm / min, and refers to the stress value measured when it breaks.

− Break point elongation of the substrate layer −
The elongation at break point of the base material layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 200% to 1,300%, more preferably 400% to 1,300%. 700% to 1,300% is more preferable. When the breaking point elongation of the base material layer is 200% or more, even if the pressure-sensitive adhesive sheet is firmly adhered to the adherend, the adherend is attached when the pressure-sensitive adhesive sheet is peeled off again. The stress for stretching in the horizontal to vertical directions with respect to the surface does not become too large, and the adhesive sheet can be easily peeled off without being excessively stretched. Further, when the breaking point elongation is 1,300% or less, the stretching distance in the horizontal direction to the vertical direction with respect to the sticking surface of the adherend becomes too long when the adhesive sheet is peeled off again. It is possible to work in a small space. On the other hand, if the elongation at the breaking point is less than 200%, the adhesive sheet is stretched in the horizontal direction to the vertical direction with respect to the sticking surface of the adherend when the adhesive sheet is peeled off again, and the adhesive sheet is broken. If it exceeds 1,300%, the stretching distance in the horizontal to vertical directions with respect to the attachment surface of the adherend becomes too long when the adhesive sheet is peeled off again. Workability may deteriorate.
The elongation at break point of the base material layer is determined by punching the base material layer into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a Tencilon tensile tester (model:: RTF-1210 (manufactured by A & D Co., Ltd.) is used to pull in the length direction at a tensile speed of 500 mm / min, and refers to the tensile elongation measured when the product breaks.

-Average thickness of substrate layer-
The average thickness of the base material layer is not particularly limited and may be appropriately selected depending on the purpose of use and the like, but is preferably 10 μm to 500 μm, more preferably 10 μm to 300 μm, and 20 μm to 20 μm. It is more preferably 200 μm, and particularly preferably 20 μm to 100 μm. When the average thickness of the base material layer is within the preferable range, the pressure-sensitive adhesive sheet easily follows the strain of the adherend and high adhesive strength can be easily obtained, and the pressure-sensitive adhesive sheet having the base material layer is adhered to the adherend. It is preferable because the stress required for re-peeling while stretching in the horizontal to vertical directions with respect to the sticking surface of the body does not become too large.
In the present specification, the "average thickness of the base material layer" refers to the base material layer at five points in the length direction at 100 mm intervals and in a direction perpendicular to the length direction (referred to as "width direction"). There is also "), and the thickness of 5 points on each cut surface at 100 mm intervals in the width direction was measured using a TH-104 paper / film thickness measuring machine (manufactured by Tester Sangyo Co., Ltd.), for a total of 25. Refers to the average value of the thickness of points.

-Average thickness of adhesive layer / Average thickness of base material-
The ratio of the thickness of the adhesive layer to the base material layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is represented by [average thickness of adhesive layer / average thickness of base material layer]. The ratio of the average thickness of the adhesive layer to the average thickness of the base material layer is preferably 1/5 to 5/1, more preferably 1/3 to 3/1, and 1/1. It is more preferably ~ 2/1. When the ratio of the average thickness of the pressure-sensitive adhesive layer to the average thickness of the base material layer is within the preferable range, excellent adhesiveness and removability of the pressure-sensitive adhesive sheet can be obtained. On the other hand, if the ratio is larger than 5/1, only the adhesive layer may remain on the adherend in the re-peeling step of the adhesive sheet. On the other hand, if the ratio is smaller than 1/5, there is a concern that the adhesive layer cannot follow the surface of the adherend and the adhesive strength is significantly lowered when the surface of the adherend has an uneven shape or the like.

-Method of forming the base layer-
The method for forming the base material layer is not particularly limited, and can be appropriately selected from known methods according to the mechanical strength required for the pressure-sensitive adhesive sheet and the like. For example, a heat press method or an extrusion method can be used. Examples thereof include a cast method by molding, a uniaxial stretching method, a sequential secondary stretching method, a simultaneous biaxial stretching method, an inflation method, a tube method, a calendar method, and a solution method. These methods may be used alone or in combination of two or more. Among these, the cast method by extrusion molding, the inflation method, the tube method, the calendar method, and the solution method are preferable in order to impart suitable flexibility and extensibility to the base material layer.

The base material layer may be surface-treated for the purpose of further improving the adhesion to the adhesive layer.
The surface treatment method is not particularly limited and can be appropriately selected from known methods as long as the characteristics of the pressure-sensitive adhesive sheet are not impaired. For example, a sandblast method, a surface polishing / friction method, and a corona discharge treatment can be selected. Examples thereof include a method, a chromic acid treatment method, a flame treatment method, a hot air treatment method, an ozone treatment method, an ultraviolet irradiation treatment method, and an oxidation treatment method.

<< Other layers >>
The other layer in the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a primer layer, an antistatic layer, a non-combustible layer, a decorative layer, a conductive layer, a heat conductive layer, and the like. A release layer and the like can be mentioned.

-Stress during 25% elongation of adhesive sheet-
The stress at 25% elongation of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.15 Mpa to 82 Mpa, more preferably 0.15 Mpa to 10 Mpa, and 0.15 Mpa to 0.15 Mpa. 5 Mpa is more preferable, and 0.15 Mpa to 2 Mpa is particularly preferable. When the stress at 25% elongation of the pressure-sensitive adhesive sheet is 0.15 Mpa to 82 Mpa, it is possible to obtain an adhesive strength suitable for the pressure-sensitive adhesive sheet, and it is possible to peel it off relatively easily even when it is stretched and peeled off. On the other hand, when the stress at 25% elongation of the pressure-sensitive adhesive sheet is less than 0.15 Mpa, the pressure-sensitive adhesive sheet is released when a load is generated in the shearing direction of the pressure-sensitive adhesive sheet while fixing hard adherends to each other. It may come off. Further, if the stress at 25% elongation of the pressure-sensitive adhesive sheet exceeds 82 Mpa, the force required for stretching the pressure-sensitive adhesive sheet may become excessive when the pressure-sensitive adhesive sheet is peeled off.
The 25% elongation stress of the pressure-sensitive adhesive sheet is obtained by punching the pressure-sensitive adhesive sheet into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm. -1210 (manufactured by A & D Co., Ltd.), and refers to the stress value measured when pulled in the length direction at a tensile speed of 500 mm / min and stretched by 25%.

− Breaking point stress of adhesive sheet −
The breaking point stress of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1.5 MPa to 100.0 MPa, more preferably 5.0 MPa to 50.0 MPa. It is more preferably 0 MPa to 40.0 MPa, and particularly preferably 5.0 MPa to 35.0 MPa. When the breaking point stress of the pressure-sensitive adhesive sheet is within the preferable range, it is possible to prevent the pressure-sensitive adhesive sheet from being torn even when the pressure-sensitive adhesive sheet is stretched and peeled off, and the pressure-sensitive adhesive sheet is stretched. Since the load of the is not excessive, the re-peeling work by peeling becomes easy. On the other hand, if the breaking point stress of the pressure-sensitive adhesive sheet is less than 1.5 MPa, the pressure-sensitive adhesive sheet may be torn when the pressure-sensitive adhesive sheet is stretched and peeled off, and if it exceeds 100.0 MPa, the pressure-sensitive adhesive sheet may be torn. When it is stretched and an attempt is made to peel it off again, it may not be stretched sufficiently and it may not be possible to peel it off again. The force required to stretch and deform the pressure-sensitive adhesive sheet also depends on the thickness of the pressure-sensitive adhesive sheet. For example, the pressure-sensitive adhesive sheet having a large thickness and a high breaking point stress is stretched and re-stretched. Even when it is attempted to be peeled off, it may not be sufficiently stretched and cannot be peeled off again.
The breaking point stress of the pressure-sensitive adhesive sheet is such that the pressure-sensitive adhesive sheet is punched into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm. , A & D Co., Ltd.), and refers to the stress value measured when the material is pulled in the length direction at a tensile speed of 500 mm / min and fractured.

-Elongation at break point of adhesive sheet-
The elongation at break of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 500% to 2,000%, more preferably 600% to 1800%, and 800%. % To 1,800% is more preferable. When the breaking point elongation of the pressure-sensitive adhesive sheet is 500% or more, even if the pressure-sensitive adhesive sheet is firmly adhered to the adherend, when the pressure-sensitive adhesive sheet is re-peeled, the surface to which the adherend is attached. The stress for stretching in the horizontal direction to the vertical direction does not become too large, and the adhesive sheet can be easily peeled off without being excessively stretched. Further, when the breaking point elongation is 2,000% or less, the stretching distance in the horizontal direction to the vertical direction with respect to the sticking surface of the adherend becomes too long when the adhesive sheet is peeled off again. It is possible to work in a small space. On the other hand, if the elongation at the breaking point is less than 500%, the adhesive sheet is stretched in the horizontal direction to the vertical direction with respect to the sticking surface of the adherend when the adhesive sheet is peeled off again, and the adhesive sheet is broken. If it exceeds 1,300%, the stretching distance in the horizontal to vertical directions with respect to the attachment surface of the adherend becomes too long when the adhesive sheet is peeled off again. Workability may deteriorate.
The elongation at break of the pressure-sensitive adhesive sheet is determined by punching the pressure-sensitive adhesive sheet into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a Tencilon tensile tester (model: RTF-). 1210, manufactured by A & D Co., Ltd.), which is pulled in the length direction at a tensile speed of 500 mm / min and refers to the tensile elongation measured when it breaks.

-Impact resistance of adhesive sheet-
The adhesive sheet has excellent impact resistance. The impact resistance can be confirmed, for example, by the method described in << Evaluation of Impact Resistance >> in Examples described later. In the evaluation of impact resistance, the height of the striking core at which the adhesive sheet is peeled off or broken can be appropriately selected as long as the effect of the present invention is not impaired, but is preferably 30 cm or more, preferably 40 cm. The above is more preferable, 50 cm or more is further preferable, and 60 cm or more is particularly preferable. If the height is less than 30 cm, sufficient impact resistance cannot be obtained.

-180 ° peel adhesive strength of adhesive sheet-
The 180 ° peel adhesive force of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3N / 20mm to 35N / 20mm, more preferably 4N / 20mm to 30N / 20mm. 5N / 20mm to 25N / 20mm is more preferable. When the 180 ° peel adhesive force is within the preferable range, the adhesive sheet is attached to the attachment surface of the adherend while having an appropriate adhesive force without causing peeling or displacement from the adherend. It can be easily peeled off when it is stretched from the horizontal direction to the vertical direction and peeled off again.
The 180 ° peel adhesive strength of the adhesive sheet refers to a value measured and measured in accordance with JIS Z 0237.

-Shear adhesive force of adhesive sheet-
The pressure-sensitive adhesive sheet is hard to peel off even when a load is applied to the pressure-sensitive adhesive sheet in the shearing direction, and has an excellent shearing adhesive force. The shearing direction is not particularly limited as long as it is perpendicular to the thickness direction of the pressure-sensitive adhesive sheet.
The shear adhesive force of the pressure-sensitive adhesive sheet can be appropriately selected as long as the effect of the present invention is not impaired, but 100 N / 4 cm ² or more is preferable, 120 N / 4 cm ² or more is more preferable, and 150 N / 4 cm ² or more is preferable. More preferably, 200 N / 4 cm ² or more is particularly preferable. When the shear adhesive force is within the preferable range, it is possible to suppress the displacement when stress in the shear direction is applied to the adherend fixed by the adhesive sheet.
The shear adhesive force of the pressure-sensitive adhesive sheet can be confirmed, for example, by the method described in << Measurement of shear adhesive force >> in Examples described later.

-Splitting adhesive strength of adhesive sheet-
The pressure-sensitive adhesive sheet is hard to peel off even when a load is applied to the pressure-sensitive adhesive sheet in the split direction (sometimes referred to as "thickness direction"), and has excellent split adhesive strength. The split adhesive force of the pressure-sensitive adhesive sheet can be appropriately selected as long as the effect of the present invention is not impaired, but 80N / 4cm ² or more is preferable, 100N / 4cm ² or more is more preferable, and 120N / 4cm ² or more is preferable. More preferred. When the split adhesive force is within the preferable range, it is possible to suppress peeling when a stress in the split direction is applied to the adherend fixed by the adhesive sheet.
The split adhesive strength of the pressure-sensitive adhesive sheet can be confirmed, for example, by the method described in << Measurement of split adhesive strength >> in Examples described later.

-Average thickness of adhesive sheet-
The average thickness of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the average thickness of the pressure-sensitive adhesive layer and the base material layer, but is preferably 15 μm to 800 μm, preferably 30 μm to 540 μm. It is more preferably 60 μm to 320 μm, and particularly preferably 70 μm to 250 μm.
In the present specification, the "average thickness of the adhesive layer" means that the adhesive sheet is cut at five points in the length direction at intervals of 100 mm in the width direction, and each of the cut surfaces is cut at intervals of 100 mm in the width direction. It refers to the average value of the total thickness of 25 points measured by using a TH-104 paper / film thickness measuring machine (manufactured by Tester Sangyo Co., Ltd.) for the thickness of the adhesive layer of the points.

-Average width of adhesive sheet-
The average width of the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected depending on the type of electronic component. The electronic components to be attached are a display, a speaker, a battery, and the like, and the average width of the adhesive sheet when fixing these can be appropriately adjusted according to the effectiveness of the display screen and the attachment space. 1, 1 mm to 50 mm is preferable, 1 mm to 25 mm is more preferable, and 0.5 mm to 10 mm is further preferable.
In the present specification, the "average width of the adhesive sheet" refers to the width of the adhesive sheet at five points at 100 mm intervals in the length direction, and a known measure such as a straightedge (scale), a tape measure, or a convex. Refers to the average value of the width of a total of 5 points measured using.

<< Manufacturing method of adhesive sheet >>
The method for producing the pressure-sensitive adhesive sheet is not particularly limited and may be appropriately selected from known methods, but preferably includes a pressure-sensitive adhesive layer forming step, a base material layer forming step, and a laminating step. Further, if necessary, other layer forming steps are included. Further, it can also be produced by a multi-layer simultaneous forming step in which the pressure-sensitive adhesive layer forming step and the base material layer forming step are performed at the same time.

-Adhesive layer forming process-
The adhesive layer forming step is not particularly limited as long as the adhesive layer can be formed, and can be appropriately selected depending on the intended purpose. For example, the same as the method described in the above-mentioned "Adhesive layer forming method". And the like, and the preferred embodiment is also the same.

-Base layer formation process-
The base material layer forming step is not particularly limited as long as the base material layer can be formed, and can be appropriately selected depending on the intended purpose. For example, it is described in the above-mentioned "Method for forming a base material layer". Examples thereof include the same method as the method, and the preferred embodiment is also the same.

-Laminating process-
The laminating step is a step of laminating the base material layer and the adhesive layer. The method for laminating the base material layer and the adhesive layer is not particularly limited and may be appropriately selected from known methods. For example, the base material layer and the adhesive layer are pressurized and laminated. How to do it.

<Manufacturing method of electronic parts>
The method for manufacturing the electronic component is not particularly limited and may be appropriately selected depending on the intended purpose, but preferably includes a pasting step and a fixing step, and further includes other steps as necessary. ..

<< Pasting process >>
The sticking step is a step of sticking one surface of the pressure-sensitive adhesive sheet so that at least a part of it is linear with respect to the first sticking target.
The adhesive sheet, the first object to be attached, and a mode in which at least a part of the adhesive sheet is attached in a straight line are as described above.

<< Fixing process >>
In the fixing step, the other surface of the pressure-sensitive adhesive sheet is stuck to the second sticking target, and the second sticking is performed in a state where at least two ends of the pressure-sensitive adhesive sheet are exposed from the second sticking target. This is the process of attaching to the target.
The state in which the second sticking object and at least two ends are exposed from the second sticking target is as described above.

The electronic component can be quickly peeled off, is not contaminated by an adhesive after peeling, and even if it is torn off in the middle of being stretched and peeled from one end, it is stretched and peeled from the other end and peeled to the end. Since it is equipped with an adhesive sheet that can be used and has an adhesive strength suitable for use, large electronic devices such as flat-screen TVs, home appliances, and OA devices, components that compose them, and portable electronic devices are provided. It can be used as a wide range of electronic components regardless of the size of the electronic components, such as small electronic devices such as terminals, cameras, and personal computers, and the components that compose them.

The present invention will be specifically described below with reference to test examples and the like, but the present invention is not limited to these examples.

In the production of the pressure-sensitive adhesive sheets (1) to (11) of Production Examples 1 to 11 below, the resin compositions (1) to (3) in the base material layer and the pressure-sensitive adhesive compositions (1) to (8) in the pressure-sensitive adhesive layer. Used the following:

<Resin composition (1)>
The resin composition (1) is a mixture of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer (hereinafter, may be referred to as “SIS”), and is represented by the following chemical formula (1). The structural unit derived from styrene was 25% by weight, and the ratio of the styrene-isoprene copolymer to the total amount of the resin composition (1) was 17% by weight.

<Resin composition (2)>
As the resin composition (2), an ester-based polyurethane compound (Mobilon film MF100T, manufactured by Nisshinbo Textile Co., Ltd.) was used.

<Resin composition (3)>
The resin composition (3) is a mixture (SIS) of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer, and the structural unit derived from styrene represented by the chemical formula (1) is 15% by weight. , And the ratio of the styrene-isoprene copolymer to the total amount of the resin composition (3) was 12% by weight.

(Preparation Example 1: Preparation of Adhesive Composition (1))
75.94 parts by weight of n-butyl acrylate, 5 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of cyclohexyl acrylate, acrylic acid 4 in a reaction vessel equipped with a stirrer, a reflux cooling tube, a nitrogen introduction tube, a thermometer, and a dropping funnel. A mixture (1) was obtained by charging 0.06 part by weight of 4-hydroxybutyl acrylate and 200 parts by weight of ethyl acetate and raising the temperature to 65 ° C. while blowing nitrogen under stirring. Next, 4 parts by weight (solid content 2.5% by weight) of a 2,2'-azobisisobutyronitrile solution previously dissolved in ethyl acetate was added to the mixture (1), and the mixture was stirred at 65 ° C. The mixture was held for 10 hours to obtain the mixture (2). Next, the mixture (2) was diluted with 98 parts by weight of ethyl acetate and filtered through a 200-mesh wire mesh to obtain an acrylic copolymer solution (1) having a weight average molecular weight of 1.6 million (polystyrene equivalent). Next, with respect to 100 parts by weight of the acrylic copolymer solution (1), 5 parts by weight of a polymerized rosin ester-based tackifier resin (D-125, Arakawa Chemical Industry Co., Ltd.) and a petroleum-based tackifier resin (FTR (registered)) A pressure-sensitive adhesive resin solution (1) having a solid content of 31% by weight was obtained by mixing and stirring with 6125 (trademark) and 15 parts by weight of Mitsui Chemicals Corporation) and then adding ethyl acetate. Next, with respect to 100 parts by weight of the pressure-sensitive adhesive resin solution (1), 1 part by mass of carbon black (MA220, manufactured by Mitsubishi Chemical Corporation) and a cross-linking agent (Bernock D-40, manufactured by DIC Corporation; tolylene diisocyanate). Add 1.3 parts by weight of methylolpropane adduct, isocyanate group content 7% by weight, non-volatile content 40% by weight), stir and mix to make it uniform, and then filter with a 100 mesh wire mesh to achieve a solid content of 31.1. A weight% adhesive resin (1) was obtained.

(Preparation Example 2: Preparation of Adhesive Composition (2))
Filler 1 (aluminum hydroxide, BW153, manufactured by Nippon Light Metal Co., Ltd., volume average particle size: 18 μm, particle size distribution (D) with respect to 100 parts by weight of the solid content of the pressure-sensitive adhesive resin (1) obtained in Preparation Example 1. ₉₀ / D ₁₀ ): 12.3) was added in an amount of 30 parts by weight to obtain a pressure-sensitive adhesive composition (2).
The particle size distribution (D ₉₀ / D ₁₀ ) of the filler particles is converted into a particle size distribution by measuring the particle size of the filler particles by using a measuring machine (microtrack) using a laser diffraction / scattering method. It is a value obtained by doing.

(Preparation Example 3: Preparation of Adhesive Composition (3))
In Preparation Example 2, the pressure-sensitive adhesive composition (3) was prepared in the same manner as in Preparation Example 2 except that the type and addition amount of the filler were changed to the types and addition amounts shown in Table 1 below.
The filler 2 is a nickel powder (Type123, manufactured by Inco, volume average particle size: 11.9 μm), and the particle size distribution (D ₉₀ / D ₁₀ ) measured by the same method as the filler 1 is 4. It is 2.

(Preparation Example 4: Preparation of Adhesive Composition (4))
The pressure-sensitive adhesive composition (4) was prepared in the same manner as in Preparation Example 2 except that the type of filler was changed to the type shown in Table 2 below.
The filler 3 is aluminum hydroxide (B303, manufactured by Nippon Light Metal Co., Ltd., volume average particle size: 23 μm), and the particle size distribution (D ₉₀ / D ₁₀ ) measured by the same method as that of the filler 1 is 18. It is .5.

(Preparation Example 5: Preparation of Adhesive Composition (5))
The pressure-sensitive adhesive composition (5) was prepared in the same manner as in Preparation Example 2 except that the type of filler was changed to the type shown in Table 2 below.
The filler 4 is aluminum hydroxide (BE033, manufactured by Nippon Light Metal Co., Ltd., volume average particle size: 3 μm), and the particle size distribution (D ₉₀ / D ₁₀ ) measured by the same method as that of the filler 1 is 5. It is 8.8.

(Preparation Example 6: Preparation of Adhesive Composition (6))
The pressure-sensitive adhesive composition (6) was prepared in the same manner as in Preparation Example 2 except that the amount of the filler added was changed to the amount shown in Table 2 below.

(Preparation Example 7: Preparation of Adhesive Composition (7))
The pressure-sensitive adhesive composition (7) was prepared in the same manner as in Preparation Example 2 except that the amount of the filler added was changed to the amount shown in Table 2 below.

(Preparation Example 8: Preparation of Adhesive Composition (8))
97.97 parts by weight of n-butyl acrylate, 2.0 parts by weight of acrylic acid, 0.03 parts by weight of 4-hydroxybutyl acrylate in a reaction vessel equipped with a stirrer, a reflux cooling tube, a nitrogen introduction tube, a thermometer, and a dropping funnel. Parts and 0.1 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator are dissolved in a solvent consisting of 100 parts by weight of ethyl acetate and polymerized at 70 ° C. for 12 hours to obtain a weight average molecular weight. Obtained 2 million (polystyrene-equivalent) acrylic copolymer solution (2). Next, with respect to 100 parts by weight of the acrylic copolymer solution (2), 25 parts by weight of glycerin ester of disproportionate rosin (Superester A100, Arakawa Chemical Industry Co., Ltd.) and pentaerythritol ester of polymerized rosin (Pencel). D135, manufactured by Arakawa Chemical Industry Co., Ltd.) 5 parts by weight and styrene-based petroleum resin (FTR (registered trademark) 6100, manufactured by Mitsui Chemicals Co., Ltd.) 20 parts by weight are added, ethyl acetate is added, and the mixture is uniformly mixed. , A pressure-sensitive adhesive solution (2) having a solid content of 31% by weight was obtained. Next, 1.3 parts by weight of an isocyanate-based cross-linking agent (Coronate L-45, manufactured by Nippon Polyurethane Industry Co., Ltd., 45% by weight of non-volatile content) was added uniformly to 100 parts by weight of the pressure-sensitive adhesive solution (2). The pressure-sensitive adhesive resin (2) having a solid content of 31.1% by weight was obtained by stirring and mixing.
Next, with respect to 100 parts by weight of the solid content of the obtained pressure-sensitive adhesive resin (2), filler 1 (aluminum hydroxide, BW153, manufactured by Nippon Light Metal Co., Ltd., volume average particle size: 18 μm, particle size distribution (D ₉₀ /) 30 parts by weight of D ₁₀ ): 12.3) was added to obtain a pressure-sensitive adhesive composition (8).

(Manufacturing Example 1: Manufacturing of Adhesive Sheet (1))
The pressure-sensitive adhesive composition (1) is applied on a release liner (film binar 75E-0010GT, manufactured by Fujimori Kogyo Co., Ltd., the same applies hereinafter) so that the thickness after drying becomes 25 μm with an applicator, and the pressure is 80 ° C. An adhesive layer was prepared by drying for minutes.
Next, toluene is added to the resin composition (1), the mixture is stirred so as to be uniform, and the resin composition is coated on a release liner with an applicator so that the thickness after drying is 100 μm, and the temperature is 60 ° C. for 5 minutes. A substrate layer was prepared by drying.
After the release liner of the base material layer is peeled off, the adhesive layer from which the release liner is peeled off is attached to both sides of the base material layer, and the laminated structure of the base material layer and the adhesive layer is 0. The pressure-sensitive adhesive sheet (1) was produced by pressurizing at 2 MPa and laminating.

(Manufacturing Example 2: Production of Adhesive Sheet (2))
The same as in Production Example 1 except that the thickness of the base material layer, the type of the pressure-sensitive adhesive composition, and the thickness of the pressure-sensitive adhesive layer were changed to the conditions shown in Table 1 in the production of the pressure-sensitive adhesive sheet (1) of Production Example 1. The adhesive sheet (2) was manufactured by the method of.

(Manufacturing Example 3: Manufacturing of Adhesive Sheet (3))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (3) was manufactured in the same manner as in Production Example 1 except that the type of the pressure-sensitive adhesive composition was changed to the conditions shown in Table 1.

(Manufacturing Example 4: Manufacturing of Adhesive Sheet (4))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (4) was manufactured in the same manner as in Production Example 1 except that the type of the pressure-sensitive adhesive composition was changed to the conditions shown in Table 1.

(Manufacturing Example 5: Manufacture of Adhesive Sheet (5))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the same method as in Production Example 1 except that the type of the resin composition and the type of the pressure-sensitive adhesive composition in the base material layer are changed to the conditions shown in Table 1. The adhesive sheet (5) was manufactured in the above.

(Manufacturing Example 6: Manufacturing of Adhesive Sheet (6))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the type of resin composition in the base material layer, the thickness of the base material layer, the type of pressure-sensitive adhesive composition, and the thickness of the pressure-sensitive adhesive layer were changed to the conditions shown in Table 1. The adhesive sheet (6) was produced in the same manner as in Production Example 1 except for the above.

(Manufacturing Example 7: Manufacture of Adhesive Sheet (7))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (7) was manufactured in the same manner as in Production Example 1 except that the type of the pressure-sensitive adhesive composition was changed to the conditions shown in Table 2.

(Manufacturing Example 8: Manufacture of Adhesive Sheet (8))
The same as in Production Example 1 except that the thickness of the base material layer, the type of the pressure-sensitive adhesive composition, and the thickness of the pressure-sensitive adhesive layer were changed to the conditions shown in Table 2 in the production of the pressure-sensitive adhesive sheet (1) of Production Example 1. The adhesive sheet (8) was manufactured by the method of.

(Manufacturing Example 9: Manufacture of Adhesive Sheet (9))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (the pressure-sensitive adhesive sheet (1) was produced in the same manner as in Production Example 1 except that the thickness of the base material layer and the type of the pressure-sensitive adhesive composition were changed to the conditions shown in Table 2. 9) was manufactured.

(Manufacturing Example 10: Manufacture of Adhesive Sheet (10))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (the pressure-sensitive adhesive sheet (1) was produced in the same manner as in Production Example 1 except that the thickness of the base material layer and the type of the pressure-sensitive adhesive composition were changed to the conditions shown in Table 2. 10) was manufactured.

(Manufacturing Example 11: Manufacture of Adhesive Sheet (11))
In the production of the pressure-sensitive adhesive sheet (1) of Production Example 1, the pressure-sensitive adhesive sheet (the pressure-sensitive adhesive sheet (1) was produced in the same manner as in Production Example 1 except that the thickness of the base material layer and the type of the pressure-sensitive adhesive composition were changed to the conditions shown in Table 2. 11) was manufactured.

25% elongation stress, breaking point stress, and breaking point elongation of the base material layer in the pressure-sensitive adhesive sheets (1) to (11) of Production Examples 1 to 11; the pressure-sensitive adhesive sheets (1) to (11) of Production Examples 1 to 11 ), 25% elongation stress of the adhesive layer, breaking point stress, breaking point elongation, and volume ratio of the filler; and 25% elongation stress of the adhesive sheets (1) to (11) of Production Examples 1 to 11. The breaking point stress, breaking point elongation, impact resistance, 180 ° peel adhesive force, shear adhesive force, and split adhesive force were measured or evaluated by the following methods. The results are shown in Tables 1 and 2 below.

<< Measurement of 25% elongation stress, breaking point stress, and breaking point elongation of adhesive sheet or base material layer >>
Each adhesive sheet or each base material layer is punched into a dumbbell shape having a marked line length of 20 mm and a width of 6 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a Tensilon tensile tester (model: RTF-1210, A Co., Ltd.) The stress at 25% elongation, the stress at the breaking point, and the elongation at the breaking point of each pressure-sensitive adhesive sheet or each base material layer were measured by pulling in the length direction at a tensile speed of 500 mm / min using (manufactured by And Day). ..

<< Measurement of 25% elongation stress, breaking point stress, and breaking point elongation of the adhesive layer >>
Each adhesive layer is punched into a dumbbell shape with a marked line length of 20 mm and a width of 10 mm, and under the conditions of a measurement atmosphere of 23 ° C. and 50% RH, a Tensilon tensile tester (model: RTF-1210, manufactured by A & D Co., Ltd.) ), The stress at 25% elongation at elongation, the stress at break point, and the elongation at break point of each adhesive layer were measured by pulling in the length direction at a tensile speed of 300 mm / min.

<< Measurement of volume ratio of filler particles in adhesive layer >>
The volume ratio of the filler of each adhesive layer was calculated from the following formulas (1) to (3).
Adhesive resin weight A (g) / Adhesive resin density A (g / cm ³ ) = Adhesive resin volume A (cm ³ ) ... Equation (1)
Filler particle weight B (g) / Filler particle density B (g / cm ³ ) = Filler particle volume B (cm ³ ) ... Equation (2)
Filler particle volume B (cm ³ ) / (Adhesive resin volume A (cm ³ ) + Filler particle volume B (cm ³ )) x 100 = Filler particle volume ratio (%) ... Equation (3)
The density A of the adhesive resin is 1.2 g / cm ^3, as the density B of the filler particles, the density of the aluminum hydroxide 2.42 g / cm ^3, the density of nickel was calculated as 8.90 g / cm ^3.

<< Evaluation of impact resistance >>
Two sheets of each adhesive sheet cut into a length of 20 mm and a width of 5 mm were prepared. As shown in FIG. 5A, the adhesive sheet 31 is parallel to an acrylic plate 32 (length 50 mm, width 50 mm, thickness 2 mm, Acrylite L, color tone: colorless, manufactured by Mitsubishi Rayon Corporation) at intervals of 40 mm. It was pasted on. Next, as shown in FIG. 5B, the acrylic plate 32 to which the adhesive sheet 31 is attached is attached to the ABS plate 33 (length 150 mm, width 100 mm, thickness 2 mm, Tough Ace R, manufactured by Sumitomo Bakelite Co., Ltd., hue: natural, grained. (None) is affixed to the central portion, and the laminated structure of the acrylic plate 32, the adhesive sheet 31, and the ABS plate 33 is pressed back and forth once with a roller while applying a load of 2 kg to be crimped. The test piece was left to stand for 24 hours under the conditions of an atmosphere of 40 ° C. and 50% RH.
As shown in Fig. 5C, a U-shaped measuring table 34 (made of aluminum with a length of 150 mm, a width of 100 mm, a height of 45 mm, and a thickness of 5 mm) is placed on the pedestal of the DuPont impact tester (manufactured by Tester Sangyo Co., Ltd.). Was installed, and the test piece was placed on the test piece so that the acrylic plate 32 in the test piece was facing downward. Under the conditions of an atmosphere of 23 ° C. and 50% RH, a stainless steel striking core (diameter 25 mm, weight 300 g) 35 was dropped from the ABS plate 33 side to the central portion of the ABS plate 33. At this time, while changing the height of the striking core 35 from 10 cm by 10 cm, the striking core 35 was dropped 5 times at intervals of 10 seconds for each height, and peeling or breakage of the adhesive sheet in the test piece was observed. The height at the time of being struck was measured. If the adhesive sheet is not peeled off or broken when dropped from 30 cm or more, there is no problem in use.

<< Measurement of 180 ° peel adhesive strength >>
The 180 ° peel adhesive strength of each adhesive sheet was measured according to JIS Z 0237. Specifically, each pressure-sensitive adhesive sheet was cut into a length of 150 mm and a width of 20 mm, and one surface of the pressure-sensitive adhesive sheet was lined with a PET film having a thickness of 25 μm. Next, the other surface of the adhesive sheet is attached to a stainless steel plate (length 100 mm, width 30 mm, thickness 3 mm) under the condition of an atmosphere of 23 ° C. and 50% RH, and the adhesive sheet and the stainless steel plate are attached. The laminated structure of No. 1 was pressed back and forth with a roller while applying a load of 2 kg to be pressure-bonded, and then allowed to stand for 1 hour under the conditions of an atmosphere of 23 ° C. and 50% RH to prepare a test piece.
The adhesive sheet in the test piece was subjected to a Tensilon tensile tester (model: RTF-1210, manufactured by A & D Co., Ltd.) in the 180 ° direction (horizontal direction) under the conditions of an atmosphere of 23 ° C. and 50% RH. The adhesive sheet was stretched at a tensile speed of 300 mm / min, and the 180 ° peel adhesive force of the adhesive sheet was measured.

<< Measurement of shear adhesive force >>
Each adhesive sheet was cut into a length of 20 mm and a width of 20 mm, respectively. A clean stainless steel plate A (length 100 mm, width 30 mm, thickness) in which one surface of the adhesive sheet is hairline-polished with water-resistant abrasive paper (No. 360) under the conditions of an atmosphere of 23 ° C. and 50% RH. It was attached to the surface of 3 mm) so that the affixing area was 20 mm × 20 mm. Next, a clean and smooth stainless steel plate B (length 100 mm) in which the surface of the adhesive sheet opposite to the surface to which the stainless steel plate A is attached is subjected to hairline polishing treatment with water-resistant polishing paper (No. 360). , Width 30 mm, thickness 3 mm), and pressurize the laminated structure of the stainless plate A, the adhesive sheet, and the stainless plate B once with a roller while applying a load of 5 kg to crimp. Then, the test piece was left to stand for 24 hours under the conditions of an atmosphere of 23 ° C. and 50% RH.
Under the conditions of an atmosphere of 23 ° C. and 50% RH, a Tensilon tensile tester (model: RTF-1210, manufactured by A & D Co., Ltd.) was used with the stainless plate A constituting the test piece fixed. The stainless plate B constituting the test piece was stretched in the shearing direction of the pressure-sensitive adhesive sheet at a tensile speed of 50 mm / min, and the shearing adhesive force was measured.

<< Measurement of split adhesive strength >>
Each adhesive sheet was cut into a length of 20 mm and a width of 20 mm, respectively. Atmosphere 23 ° C., 50% RH, on one side of the adhesive sheet, on the surface of a clean and smooth aluminum plate (alloy number A1050, length 50 mm, width 40 mm, thickness 3 mm), sticking area It was attached so that the size was 20 mm × 20 mm. Next, a clean and smooth aluminum plate (alloy number A1050, length 50 mm, width 40 mm, thickness 3 mm) is attached to the surface of the adhesive sheet opposite to the surface to which the aluminum plate is attached. After applying a load of 5 kg to the laminated structure of the two aluminum plates and the adhesive sheet and pressing them back and forth once with a roller to crimp them, the atmosphere is 23 ° C. and 50% RH for 24 hours. The rest was used as a test piece.
A Tensilon tensile tester (model: RTF-1210, manufactured by A & D Co., Ltd.) was used with the aluminum plate A constituting the test piece fixed under the conditions of an atmosphere of 23 ° C. and 50% RH. The aluminum plate B constituting the test piece was stretched in the split direction (thickness direction) of the pressure-sensitive adhesive sheet at a tensile speed of 50 mm / min, and the split adhesive force was measured.

(Test Examples 1 to 11)
The adhesive sheets (1) to (11) of Production Examples 1 to 11 are cut into a width of 10 mm and a length of 60 mm, respectively, and as shown in FIG. 6A, one surface 41a of the adhesive sheet 41 is a clean and smooth aluminum plate. It was attached so as to be linear with respect to 42 (alloy number A1050, length 50 mm, width 40 mm, thickness 3 mm). Next, the other surface 41b of the adhesive sheet 41 was attached to a clean and smooth surface acrylic plate 43 (length 40 mm, width 40 mm, thickness 3 mm, Acrylite L, color tone: colorless, manufactured by Mitsubishi Rayon Corporation). At this time, both ends of the adhesive sheet 41 in the length direction (extension direction) (first grip portion A and second grip portion B) are exposed from both ends of the acrylic plate 43 by 10 mm in width and 10 mm in length, respectively. I pasted it with. Next, the laminated structure of the aluminum plate 42, the adhesive sheet 41, and the acrylic plate 43 was pressed back and forth with a roller while applying a load of 5 kg to be crimped, and then the atmosphere was 23 ° C. and 50% RH. It was allowed to stand for 3 days under the conditions.
The adhesive sheets used in Test Examples 1 to 11 are as shown in Table 3 below. In addition, in Table 3 below, this sticking mode is shown as "X".

(Comparative Test Examples 1 to 11)
The adhesive sheets (1) to (11) of Production Examples 1 to 11 are cut into a width of 10 mm and a length of 70 mm, respectively, and as shown in FIG. 6C, one surface 44a of the adhesive sheet 44 is a clean and smooth aluminum plate. It was attached so as to be linear with respect to 42 (alloy number A1050, length 50 mm, width 40 mm, thickness 3 mm). Next, the other surface 44b of the adhesive sheet 44 was attached to a clean and smooth surface acrylic plate 43 (length 40 mm, width 40 mm, thickness 3 mm, Acrylite L, color tone: colorless, manufactured by Mitsubishi Rayon Corporation). At this time, one end (grip portion A') of the adhesive sheet 44 in the length direction (extension direction) was attached from one end of the acrylic plate 43 in a state of being exposed with a width of 10 mm and a length of 10 mm. Next, the laminated structure of the aluminum plate 42, the adhesive sheet 44, and the acrylic plate 43 was pressed back and forth once with a roller while applying a load of 5 kg to be crimped, and then the atmosphere was 23 ° C. and 50% RH. It was allowed to stand for 3 days under the conditions.
The adhesive sheets used in Comparative Test Examples 1 to 11 are as shown in Table 3 below. In addition, in Table 3 below, this sticking mode is shown as "Y".

<< Evaluation of removability 1 >>
Each of the laminated structures of Test Examples 1 to 11 and Comparative Test Examples 1 to 11 was evaluated for removability in the horizontal direction by the following method.
The first grip portion A and the second grip portion B in each of the pressure-sensitive adhesive sheets used in Test Examples 1 to 11 and the grip portion A'in each of the pressure-sensitive adhesive sheets used in Comparative Test Examples 1 to 11 have an atmosphere of 23 ° C. , 50% RH, 180 ° direction (horizontal direction) (direction indicated by extension direction p in FIG. 6A or extension direction p in FIG. 6C) Tencilon tensile tester (model: RTF-1210, A. Co., Ltd.) It was stretched at a tensile speed of 300 mm / min using a product manufactured by And Day), and a stretch peeling test was performed. In the stretch peeling test, the horizontal stretch peeling test was performed 5 times (n = 5), and the vertical stretch peeling test was performed 5 times (n = 5), for a total of 10 times. In the case of the sticking mode X of Test Examples 1 to 11, after stretching and peeling from one of the first gripping portion A and the second gripping portion B, stretching and peeling from the other is performed once ( The test was n = 1).
In this stretch peeling test, the degree of residual adhesive on the adherend (acrylic plate) after peeling the pressure-sensitive adhesive sheet was visually confirmed and evaluated based on the following evaluation criteria. In addition, the tearing of the adhesive sheet at the time of stretching and peeling and the dismantability of the aluminum plate and the acrylic plate were evaluated based on the following evaluation criteria. The evaluation results are shown in Table 3 below.

[Evaluation criteria for adhesive residue]
◯: No adhesive residue ×: Adhesive residue In the evaluation criteria for adhesive residue, “○” indicates that there is no problem in use.

As an example of the degree of residual adhesive in the stretch peeling test, the appearance of the acrylic plate after the horizontal stretch peeling of Test Example 1 is shown in FIG. 7A, and after the horizontal stretch peeling of Comparative Test Example 1. The appearance of the acrylic plate is shown in FIG. 7B. In FIG. 7A, "410" indicates the place where the adhesive sheet was attached, and "p" indicates the stretching direction of the adhesive sheet. Further, in FIG. 7B, "440" indicates the place where the adhesive sheet was attached, and "p" indicates the stretching direction of the adhesive sheet. As is clear from this result, there was no residual adhesive when the adhesive was applied in the application mode X, whereas a clear residue of the adhesive sheet was observed when the adhesive sheet was applied in the application mode Y.

[Evaluation criteria for shreds]
⊚: The number of times of tearing was 0 ○: The number of times of tearing was 1 to 2 times Δ: The number of times of tearing was 3 to 4 times ×: The number of times of tearing was The number of times was five. In the evaluation criteria for tearing, "○" and "◎" indicate that there is no problem in use.

[Evaluation criteria for dismantling]
⊚: The number of times of dismantling was 5 times ○: The number of times of dismantling was 3 to 4 times Δ: The number of times of dismantling was 1 to 2 times ×: The number of times of dismantling was possible The number of times was five. In the evaluation criteria for dismantling, "○" and "◎" indicate that there is no problem in use.

From the results in Table 3 above, when the sticking mode of Test Examples 1 to 11 is X, there is no contamination by the adhesive after peeling, and a thousand is in the process of being stretched and peeled from one end (first grip). It was found that even if it was cut, it could be stretched and peeled from the other end (second grip) and peeled to the end. On the other hand, when the application mode of Comparative Test Examples 1 to 11 is Y, even if the adhesive can be stretched and peeled off, the adhesive remains on the adherend and is torn off during the stretch peeling from one end. If it did, it could not be peeled off until the end, and the aluminum plate and acrylic plate could not be disassembled.

<< Evaluation of removability 2 >>
Each of the laminated structures of Test Examples 1 to 11 was evaluated for removability in the vertical direction by the following method.
In the << evaluation of removability 1 >>, the stretching conditions of the first grip portion A and the second grip portion B in each of the adhesive sheets used in Test Examples 1 to 11 are set in the 180 ° direction (horizontal direction). Except for the change from (the direction indicated by the extension direction p in FIG. 6A) to the 90 ° direction (vertical direction) (the direction indicated by the extension direction p in FIG. A stretch peeling test is performed in the same manner as in the evaluation of peelability 1 >>, and the adhesion to the adherend (acrylic plate) after peeling the adhesive sheet is performed in the same manner as in the above << Evaluation of re-peelability 1 >>. The degree of residue of the agent, the tearing of the adhesive sheet at the time of stretching and peeling, and the dismantability of the aluminum plate and the acrylic plate were evaluated. The evaluation results are shown in Table 4 below.

From the results in Table 4 above, the adhesive sheets (2) to (11) of Test Examples 2 to 11 are peeled off even when they are stretched and peeled off in the 90 ° direction (vertical direction) with respect to the sticking surface of the adhesive sheet. It was later found that there was no adhesive contamination.

Examples of aspects of the present invention include the following.
<1> One surface is attached so that at least a part is linear with respect to the first attachment target, the other surface is attached to the second attachment target, and at least two ends are attached. Is an electronic component characterized in that the adhesive sheet attached to the second attachment object is provided in a state of being exposed from the second attachment object.
<2> At least one of the first attachment target and the second attachment target is the electronic component according to <1>, which is a recovered component.
<3> The electronic component according to any one of <1> to <2>, wherein the recovered component is at least one of a display glass and a battery.
<4> When the width of the sticking area of the adhesive sheet in the electronic component is X (cm) and the length of the sticking area is Y (cm), the ratio of the width of the sticking area to the length of the sticking area ( The electronic component according to any one of <1> to <3>, wherein X / Y) is 1 / 100,000 to 1/1.

The electronic component can be quickly peeled off, is not contaminated by an adhesive after peeling, and even if it is torn off in the middle of being stretched and peeled from one end, it is stretched and peeled from the other end and peeled to the end. Since it is equipped with an adhesive sheet that can be used and has an adhesive strength suitable for use, large electronic devices such as flat-screen TVs, home appliances, and OA devices, components that compose them, and portable electronic devices are provided. It can be used as a wide range of electronic components regardless of the size of the electronic components, such as small electronic devices such as terminals, cameras, and personal computers, and the components that compose them.

1 Grip tab 2 Adhesive area 3 End part 4 1st adhesive area 5 2nd adhesive area 6 3rd adhesive area 7 Tip part 21 Adhesive sheet 21a One surface of adhesive sheet 21 21b The other surface of adhesive sheet 21 22 First sticking target 23 Second sticking target 31 Adhesive sheet 32 Acrylic plate 33 ABS plate 34 U-shaped measuring table 35 Strike core 41 Adhesive sheet 41a One surface of adhesive sheet 41 41b The other surface of adhesive sheet 41 42 First sticking target 43 Second sticking target 44 Adhesive sheet 61 Adhesive sheet 61a One surface of adhesive sheet 61 61b The other surface of adhesive sheet 61 62 Back chassis 63 Battery 71 Adhesive sheet 71a One surface of adhesive sheet 71 71b The other surface of the adhesive sheet 71 72 Bezel 73 Display 410 Where the adhesive sheet was attached 440 Where the adhesive sheet was attached A First grip B Second grip C Third grip D Fourth Grip part A'Grip part p Extension direction

Claims (4)

One surface is attached so that at least a part is linear with respect to the first attachment target, the other surface is attached to the second attachment target, and at least two ends are the first. An electronic component comprising an adhesive sheet attached to the second attachment object in a state of being exposed from the second attachment object. The electronic component according to claim 1, wherein at least one of the first affixed object and the second affixed object is a collected part. The electronic component according to any one of claims 1 to 2, wherein the recovered component is at least one of a display glass and a battery. When the width of the sticking area of the adhesive sheet in the electronic component is X (cm) and the length of the sticking area is Y (cm), the ratio of the width of the sticking area to the length of the sticking area (X / Y). The electronic component according to any one of claims 1 to 3, wherein) is 1 / 100,000 to 1/1.

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