JP6962500B2 - Adhesive, how to assemble the adhesive, and how to disassemble the adhesive - Google Patents

Description

The present invention relates to an adhesive body, a method for assembling the adhesive body, and a method for disassembling the adhesive body.

Since the adhesive tape has excellent workability and high adhesive reliability, it is widely used as a joining means in various industrial fields such as OA equipment, IT / home appliances, and automobiles. In these fields, by using an adhesive tape, a label or the like displaying parts or product information is fixed or temporarily fixed to a housing or the like, and the product or the like (adhesive) obtained in this way is widely used. It is provided (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-89726

By the way, in recent years, from the viewpoint of environmental protection, there is an increasing demand for recycling and reuse of used products in various industrial fields such as home appliances and automobiles. When recycling and reusing various products, the used products are disassembled and each part in the product is removed. When removing each part, the adhesive tape used for fixing the parts and labeling is used. Work to peel off is required. However, the adhesive tape is provided in various places in the product, and it is desired to reduce the work cost by making it easier to remove.
Specifically, with the recent increase in performance, parts are being mounted at high density in various products. In such a product, as shown in FIG. 4, for example, using an adhesive tape 42 having an elastic rubber base material, the component 40 is a housing, another component 41, or the like (hereinafter, simply referred to as a housing). At that time, other parts (not shown) may be attached to the housing 41 in the vicinity of the part 40 attached using the adhesive tape. When disassembling such a product for recycling or the like, in order to remove the part 40, the adhesive tape 42 must be peeled off while avoiding the other parts, and the handle portion of the adhesive tape 42 is attached to the surface to be attached. It was supposed to be peeled off by pulling it in a direction of a high angle (for example, 60 ° or more). However, when the adhesive tape 42 is pulled at a high angle, a load is applied to the adhesive tape 42 and the adhesive tape 42 may be torn off. As described above, conventionally, the work cost has been increased because the adhesive tape cannot be easily removed.

Therefore, the present invention has been made in view of the above problems, and even when the adhesive tape is peeled off at an angle with respect to the sticking surface as described above, the load on the adhesive tape is reduced to prevent tearing. It is an object of the present invention to provide an adhesive body, a method for assembling the adhesive body for obtaining the adhesive body, and a method for disassembling the adhesive body for removing parts and the like in the adhesive body, which can be prevented.

As a result of diligent studies to solve the above-mentioned problems of the prior art, the present inventors have obtained the adhesive tape 42 when the component 40 is fixed to the housing 41 using the adhesive tape 42 as shown in FIG. When peeling from the part 40 at an angle to the sticking surface, when the adhesive tape 42 starts to be pulled, a large force is applied to the part of the adhesive tape 42 that sticks to the vicinity of the corner 43 of the part 40 at the beginning of its elongation. In addition, the load on the adhesive tape 42 can be reduced by applying a treatment to facilitate the mold release near the corner 43 of the outer surface of the component 40 on the adhesive tape 42 side.
On the other hand, when the outer surface of the part 40 near the corner 43 is subjected to the mold release treatment, if the treated portion is thick, the fixing force of the part 40 by the adhesive tape 42 may decrease due to the treated portion. We have obtained the knowledge that there is, and have reached the present invention.
That is, the invention of the present application is as follows.

[1] An adhesive body comprising an adhesive tape, a first adherend attached on one surface of the adhesive tape, and a second adherend attached on the other surface of the adhesive tape. And
The first adherend has a contact angle of 80 to 80 to a portion of the first attachment surface of the first adherend to which the adhesive tape is attached, which is adjacent to a corner defining the first attachment surface. It has a mold release portion that is 180 ° and has a thickness of 10 μm or less.
The adhesive tape is attached on the release portion, and the portion of the adhesive tape on the end side of the portion attached to the release portion is located outside the first attachment surface. ,
The adhesive tape is characterized by comprising a base material layer having a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa, and adhesive layers on both sides of the base material layer. Adhesive.
[2] The adhesive according to the above [1], wherein the mold release portion has a length of 0.5 to 30 mm measured from the corner adjacent to the mold release portion in a direction orthogonal to the corner. ..
[3] The adhesive according to the above [1] or [2], wherein the release portion has a length of 0.5 mm or more measured along the corner adjacent to the release portion.
[4] The release portion contains one or more resins selected from the group consisting of silicone resins, fluororesins, rubber-based resins, polyolefin-based resins, alkylated melamine formaldehyde resins, and long-chain alkyl compounds. 1] The adhesive according to any one of [3].
[5] The method for assembling an adhesive according to any one of the above [1] to [4].
A method for assembling an adhesive body, which comprises a step of adhering the first adherend and the adhesive tape so that the adhesive tape is located on the release portion.
[6] The method for disassembling the adhesive according to any one of the above [1] to [4].
A method for disassembling an adhesive body, which comprises a step of pulling a portion of the adhesive tape on the end side of the portion to be attached to the release portion at an angle of 60 ° or more with respect to the attachment surface. ..

According to the present invention, even when the adhesive tape is peeled off at an angle to the sticking surface, the load on the adhesive tape can be reduced and tearing can be prevented. It is possible to provide an assembling method and a method of disassembling the adhesive for removing parts and the like in the adhesive.

It is a partial cross-sectional view which shows the adhesive body which concerns on one Embodiment of this invention. It is a perspective view which shows the 1st adherend of the adhesive shown in FIG. (A) and (b) are perspective views showing an example of an adhesive tape that can be used for the adhesive shown in FIG. It is a figure which shows the state which the component was attached to the housing using the conventional adhesive tape.

Hereinafter, embodiments of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings, but the present invention is not limited to the present embodiment.
《Adhesive body》
As shown in FIG. 1, the adhesive body 1 of the present embodiment includes an adhesive tape 30, a first adherend 10 attached on one surface of the adhesive tape 30, and the other of the adhesive tape 30. It includes a second adherend 20 attached on the surface. Further, in the adhesive body 1 of the present embodiment, the first adherend 10 defines the first attachment surface 12 of the first attachment surfaces 12 of the first adherend 10 to which the adhesive tape 30 is attached. A mold release portion 11 having a contact angle of 80 to 180 ° and a thickness of 10 μm or less is provided in a portion adjacent to the angle 13. Further, in the adhesive body 1 of the present embodiment, the adhesive tape 30 is attached on the release portion 11, and the portion of the adhesive tape 30 on the end side of the portion attached to the release portion 11 is the first. 1 It is located outside the sticking surface 12. Further, in the adhesive body 1 of the present embodiment, the adhesive tape 30 has a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa on both sides of the base material layer 31 and the base material layer 31. Is provided with an adhesive layer 32.

Therefore, according to the adhesive 1 of the present embodiment, the adhesive tape 30 is less likely to adhere to the mold release portion 11, so that the adhesive tape 30 is removed in order to remove the first adherend 10 from the second adherend 20. When peeling off at an angle with respect to the sticking surface, the load on the adhesive tape 30 can be reduced, so that the adhesive tape 30 can be prevented from being torn.
Specifically, in the conventional equipment in which parts are mounted at high density, other members are also attached to the housing in close proximity to the parts attached using the adhesive tape. Then, in order to peel off the adhesive tape while avoiding the other members, the handle portion of the adhesive tape is pulled at an angle with respect to the sticking surface and peeled off, which may cause a load on the adhesive tape and may be torn off. rice field.
On the other hand, in the adhesive body 1 of the present embodiment, the adhesive tape 30 is attached to the release portion 11 of the first attachment surface 12 of the first adherend 10, which is difficult to adhere. When the adhesive tape 30 is peeled off from the first adherend 10 at an angle to the sticking surface, it is applied to the portion of the adhesive tape 30 that sticks to the vicinity of the corner 13 of the first adherend 10, and the adhesive tape starts to stretch. The large force of the mold can be relaxed by the mold release portion 11. Therefore, the load on the adhesive tape 30 can be reduced and tearing can be prevented.
Further, since the thickness of the release portion 11 in the present embodiment is 10 μm or less, the bonding between the first adherend 10 and the second adherend 20 in the adhesive 1 should be sufficiently strengthened. Can be done. Specifically, when the thickness is thick, even when the first adherend 10 is attached to the second adherend 20, the adhesive tape 30 is used as a trigger for the release portion 11. 1 There is a risk that the fixation of the adherend 10 will be reduced. However, since the thickness is 10 μm or less, the influence on the adhesiveness of the adhesive tape 30 attached to the first attachment surface 12 of the first adherend 10 can be sufficiently reduced. Therefore, in the present embodiment, even if the first adherend 10 is provided with the release portion 11, a sufficient bonding force can be secured.

(1st adherend, 2nd adherend)
The first adherend 10 and the second adherend 20 are not particularly limited, and are used in various industrial fields such as OA equipment, IT / home appliances, and automobiles. As an example of the combination of the first adherend 10 and the second adherend 20, for example, the second adherend 20 is used as the housing of the products, and the first adherend 10 is incorporated into the products. , Electronic parts, structural parts, etc. Then, the first adherend 10 and the second adherend 20 can be fixed or temporarily fixed by the adhesive tape 30. Alternatively, as an example of the combination of the first adherend 10 and the second adherend 20, for example, the first adherend 10 is used as a label for displaying product information and the like, and the second adherend 20 is designated as a label. It can also be used as a display unit for displaying.
Further, the specific material for forming the surfaces of the first adherend 10 and the second adherend 20 may be arbitrary depending on the first adherend 10 and the second adherend 20, but for example. It can be made of resin or metal.

Further, in the illustrated example, the first sticking surface 12 to which the adhesive tape 30 is stuck in the first adherend 10 is the second sticking surface to which the adhesive tape 30 is stuck in the second adherend 20. It is smaller than 21. Further, the second sticking surface 21 of the second adherend 20 can be attached with other parts other than the first adherend 10.
Further, the first sticking surface 12 of the first adherend 10 and the second sticking surface 21 of the second adherend 20 can be smooth flat surfaces, but the sticking surfaces 12 and 21 may be curved surfaces. good.

In the present embodiment, as shown in FIGS. 1 and 2, the first adherend 10 is the first attachment surface 12 of the first attachment surfaces 12 of the first adherend 10 to which the adhesive tape 30 is attached. A mold release portion 11 having a contact angle of 80 to 180 ° and a thickness of 10 μm or less is provided in a portion adjacent to the angle 13 defining the above.
In the present embodiment, the corner 13 adjacent to the portion where the release portion 11 is formed on the first attachment surface 12 of the first adherend 10 is not particularly limited, and the first adherend 10 is the first. It can be any corner defining the sticking surface 12. The corner 13 is the design of the adhesive body 1 (arrangement of the first adherend 10 in the second adherend 20, etc.) or the shape of the adhesive tape 30 to be attached to the first adherend 10, specifically. Can be arbitrarily selected depending on the position of the handle portion of the adhesive tape 30 which can be a portion to be grasped by the user when the adhesive tape 30 is peeled off from the adhesive body 1. Further, on the first sticking surface 12 of the first adherend 10, as shown in FIG. 2, at one corner 13 of the corners defining the first sticking surface 12, the mold release portion 11 is adjacent to the corner 13. However, in the present embodiment, if necessary, the mold release portion 11 may be provided adjacent to all or a part of the corners 13 defining the first attachment surface 12. good.
Further, in the present embodiment, a portion such as the release portion 11 having a contact angle of 80 to 180 ° and a thickness of 10 μm or less is included in the first attachment surface 12 of the first adherend 10. It can be provided in a portion other than the portion adjacent to the corner 13 defining the first attachment surface 12, and may be formed on the side surface or the upper surface of the first adherend 10, or is adjacent to the release portion 11. On the side surface of the first adherend 10 adjacent to the corner 13, it may be formed adjacent to the corner 13.
Further, the corner 13 of the first adherend 10 may have a rounded shape, for example, chamfered, as well as a square shape as shown in the illustrated example.

Here, the thickness of the release portion 11 is 10 μm or less, preferably 7 μm or less, and more preferably 5 μm or less. On the other hand, the thickness is not particularly limited from the viewpoint of adhesiveness, but the lower limit thereof is preferably 0.1 μm, more preferably 0.1 μm, from the viewpoint of making the release portion 11 sufficient strength and durability. It is 0.5 μm, more preferably 1.0 μm.

The thickness of the release portion 11 can be measured by a method using a dial gauge according to JIS K6783.

In the present embodiment, the surface of the release portion 11 has a contact angle of 80 to 180 ° as described above. When the contact angle is 80 ° or more, the adhesive tape 30 is less likely to adhere, and when the adhesive tape 30 is peeled off, the adhesive tape 30 can be effectively prevented from being torn. Further, by setting the contact angle to 180 ° or less, peeling can be prevented.
The contact angle is preferably 90 to 160 °, more preferably 100 to 120 °.

The contact angle of the release portion 11 can be measured by a drip method according to JIS R3257. Specifically, it can be measured by the method described in Examples.

The method for setting the contact angle within the above-mentioned predetermined range is not particularly limited, and examples thereof include using a hydrophobic material for the release portion 11.
Examples of such a material include, but are not limited to, silicone resin, fluororesin, rubber resin, polyolefin resin, alkylated melamine formaldehyde resin, and long-chain alkyl compound, and the material is a group consisting of these resins. Contains one or more resins that are more selected. Among them, as the material, a silicone resin, a fluororesin, or a long-chain alkyl compound is preferable from the viewpoint of preventing the adhesive tape 30 from being torn off.

-Silicone resin-
Here, the silicone resin refers to a silicone-based compound generally known as a silicone-based mold release agent. Silicone is a polymer composed of a main chain formed by alternately bonding silicon having an organic group (for example, an alkyl group or a phenyl group) and oxygen. Silicone compounds having dimethylpolysiloxane as the basic skeleton are preferred.

-Fluororesin-
The fluororesin is not particularly limited, and is not particularly limited, and is a fluororesin such as polytetrafluoroethylene (PTFE), perfluoropolyether oil, a nonionic surfactant modified with a perfluoroalkyl group, and perfluoroalkyl. Examples thereof include poly (meth) acrylate having a (meth) acrylate modified with a group and a perfluoropolyether group as a polymerization unit, and commercially available products may be used.

-Rubber resin-
Examples of the rubber-based resin include butadiene-based, styrene-butadiene-based, coloroprene-based, butyl-based, ethylene / propylene-based, and acrylic-based rubbers.

-Polyolefin resin-
Examples of the polyolefin-based polymer that is a component of the release portion 11 include homopolymers and copolymers of α-olefins such as ethylene, propylene, butene, hexene, and octene. Further, a copolymer of ethylidene norbornene, norbornene and the like and an α-olefin such as ethylene can also be mentioned. Further, hydrocarbon-based elastomers such as diene rubbers obtained by living polymerization typified by polyisoprene, polymers obtained by hydrogenating them, and elastomers obtained by ring-opening polymerization of cyclic olefins can also be used. ..

Examples of the olefin-based polymer obtained by ring-opening polymerization of cyclic olefins include ring-opening polymers of alicyclic olefins such as cyclopentene, cyclooctene, and norbornene. Further, polyolefins obtained by hydrogenation such as a nuclear hydrogen additive of a styrene-butadiene copolymer and a nuclear hydrogen additive of a styrene isoprene copolymer can be used.

In the present embodiment, it is preferable to use a polyolefin-based elastomer, particularly a polyolefin-based elastomer obtained by polymerizing with a metallocene catalyst. By polymerizing using a metallocene catalyst, it is possible to obtain a polyolefin-based elastomer having a narrow molecular weight distribution and a small amount of low molecular weight components. Further, if a metallocene catalyst is used, uniform copolymerization is possible, and the formation of low molecular weight components whose comonomer content is significantly different from the average composition can be suppressed. Therefore, it is possible to suppress stickiness when the release portion 11 (coating film) is formed, and it is possible to uniformly introduce cross-linking groups for imparting chemical resistance to the coating film, resulting in efficient efficiency. A mold release portion 11 that can be gelled and has high chemical resistance, heat resistance, and coating film strength can be obtained.

Specific examples of metallocene catalysts include rac-isopropyridenebis (1-indenyl) zirconium dichloride, rac-dimethylsilylbis-1- (2-methylindenyl) zirconium dichloride, and rac-dimethylsilylbis-1- (2-). Methyl-4-phenylindenyl) zirconium dichloride, rac-dimethylsilylbis-1- (2-methyl-4.5-benzoindenyl) zirconium dichloride, isopropylidene-9-fluorenylcyclopentadienyl zirconium dichloride, Examples thereof include dimethylsilylenebis (cyclopentadienyl) zirconium dichloride.

In the polymerization using a metallocene catalyst, commonly used cocatalysts, that is, organic aluminum such as triethylaluminum and methylalmoxane, tetrakis (pentafluorophenyl) borate and the like can be used.

The polyolefin-based elastomer may be a modified polyolefin-based elastomer. As the modified polyolefin-based elastomer, a homopolymer or copolymer of an olefin monomer is provided with a cyclic ether group such as a hydroxyl group, an amino group, a carboxyl group, an acid anhydride group or an epoxy group, or a functional group such as an isocyanate group. Examples thereof include those obtained by reacting the compounds having the same. In addition, a polymer copolymerized with another reactive monomer having an olefin as a main component can also be mentioned.

A meta (acrylate) monomer having a polar group is copolymerized with the monomer for producing the polyolefin, or the polyolefin-based elastomer is in a solution, in a molten state, or in a suspended state in the presence of a radical initiator. A polar group can be introduced into the polyolefin chain by reacting with a monomer having a polar group.

-Alkylated melamine formaldehyde resin-
Examples of the alkylated melamine formaldehyde resin include alkylated melamine formaldehyde resins having an alkyl group having 6 to 20 carbon atoms. These resins can be obtained, for example, by adding formaldehyde to the melamine monomer as an auxiliary agent to generate methylolated melamine, and introducing an alkyl group having 6 to 20 carbon atoms into the produced methylol group.

-Long chain alkyl compound-
The long-chain alkyl compound refers to a compound having a linear or branched alkyl group (also referred to as a long-chain alkyl group) having 8 or more carbon atoms, and specifically, a long-chain alkyl group-containing polyvinyl resin or a long chain. Examples thereof include an alkyl group-containing acrylic resin, a long-chain alkyl group-containing polyester resin, a long-chain alkyl group-containing ether compound, a long-chain alkyl group-containing amine compound, and a long-chain alkyl group-containing alkyd resin.

The long-chain alkyl group preferably has 8 or more carbon atoms, more preferably 10 or more carbon atoms, and particularly preferably 12 or more carbon atoms. The upper limit of the number of carbon atoms is preferably 30 or less, more preferably 28 or less, and particularly preferably 25 or less.

The long-chain alkyl group-containing polyvinyl resin includes a polyvinyl alcohol polymer (including a partially saponified product of polyvinyl acetate), an ethylene-vinyl alcohol polymer (including a partially saponified product of an ethylene-vinyl acetate copolymer), or a vinyl alcohol-. It can be synthesized by reacting an acrylic acid copolymer (including a partially saponified product of a vinyl acetate-acrylic acid copolymer) with a long-chain alkyl group-containing isocyanate compound. In this case, a hydroxyl group can be contained in the polymer by adjusting the amount of the long-chain alkyl group-containing isocyanate compound added.

Examples of the long-chain alkyl group-containing isocyanate compound include monoisocyanate compounds having an alkyl group having 8 or more carbon atoms, and specific examples thereof include octyl isocyanate, nonyl isocyanate, decyl isocyanate, dodecyl isocyanate, tetradecyl isocyanate, and hexadecyl. Examples thereof include isocyanate and octadecyl isocyanate.

The long-chain alkyl group-containing acrylic resin has a single weight of an acrylic monomer or a methacrylic monomer having a long-chain alkyl group, such as octyl acrylate, octyl methacrylate, lauryl acrylate, lauryl methacrylate, octadecyl acrylate, or octadecyl methacrylate. Examples include coalescing or copolymers.

Examples of other monomers used in the above-mentioned copolymer include acrylic acid, methacrylic acid, acrylamide, methacrylamide, and styrene.

The long-chain alkyl group-containing alkyd resin is a condensate of a polybasic acid having a long-chain alkyl group and a polyhydric alcohol modified with a fatty oil or a fatty acid. Examples of the polybasic acid include saturated polybasic acids such as phthalic anhydride, terephthalic acid, succinic acid, adipic acid, and sebacic acid, and unsaturated polybasic acids such as maleic anhydride, maleic anhydride, fumaric acid, itaconic acid, and citraconic anhydride. Other polybasic acids such as basic acid, cyclopentadiene-maleic anhydride adduct, terpene-maleic anhydride adduct, rosin-maleic anhydride adduct can be mentioned. Polyhydric alcohols include dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, trimethylene glycol and tetramethylene glycol, trihydric alcohols such as glycerin and trimethylpropane, diglycerin, triglycerin and pentaerythritol. , Dipentaerythritol, mannitol, sorbitol and other tetravalent or higher alcohols. Modifiers include soybean oil, flaxseed oil, millet oil, castor oil, dehydrated castor oil, palm oil, and their fatty acids, stearic acid, oleic acid, linoleic acid, linoleic acid, eleostearic acid, ricinoleic acid, and dehydrated. Examples thereof include oils and fats such as ricinoleic acid, oil and fat fatty acids, natural resins such as rosin, koval, succinic acid and cellac, and synthetic resins such as ester gum, phenol resin, urea resin and melamine resin. Further, a stearic acid-modified alkyd resin and / or a cured resin of stearic acid-modified acrylic resin and amino resin is also preferable from the viewpoint of the balance between coatability and peelability.

By the way, as described above, the mold release portion 11 in the present embodiment has a predetermined thickness and a predetermined contact angle, and in order to satisfy each of them at the same time, the material as described above is used. The coating is preferably performed by a method of gravure printing, microgravure coating, screen printing, die coating, or comma coating. Among them, it is preferable to perform gravure printing from the viewpoint that the release portion 11 can be easily provided in an arbitrary portion.

Further, in the present embodiment, when the release portion 11 is provided on the first attachment surface 12 of the first adherend 10, it is preferable to provide an easy-adhesion layer. The durability of the release portion 11 can be further improved. When the easy-adhesive layer is provided, the thickness of the release portion shall be the thickness including the easy-adhesive layer.

Here, in the present embodiment, the mold release portion 11 preferably has a length measured along a direction orthogonal to the extending direction of the angle 13 of 0.5 to 30 mm, more preferably 3 to 25 mm. It is more preferably 5 to 20 mm. By setting the length to 0.5 mm or more, when the adhesive tape 30 is peeled off, even if the handle portion of the adhesive tape 30 is pulled at an angle, the load on the adhesive tape 30 is reduced and the tearing is effectively effective. Can be prevented.
Further, when the handle portion of the adhesive tape 30 is pulled at an angle, when the tension of the adhesive tape 30 is started, the adhesive tape 30 extends to the portion of the adhesive tape 30 that adheres to the vicinity of the corner 13 of the first adherend 10. Since a larger force is applied at the beginning, the length of the peeled portion may be long enough to facilitate peeling at the beginning of stretching of the adhesive tape 30. Then, the length of the release portion 11 measured along the direction orthogonal to the extending direction of the corner 13 is 30 mm or less, so that the load on the adhesive tape 30 is sufficiently reduced when the adhesive tape 30 is peeled off. can do. Further, by setting the length to 30 mm or less, the peeled portion does not become too large, and the influence of the adhesive tape 30 on the fixing force of the first adherend 10 can be suppressed.

The length of the release portion 11 measured along the extending direction of the angle 13 is preferably 5 mm or more, more preferably 10 mm or more, and further preferably 15 mm or more.
When the length is 5 mm or more, the adhesive tape 30 can be easily attached to the release portion 11.
The upper limit of the length varies depending on the shape of the first adherend 10, but is preferably 150 mm or less, and more preferably all of the corners 13 adjacent to the peeled portion (first adherend 10). Provided on one side (from one end to the other). When the length measured along the extending direction of the corner 13 is 100 mm or less, high adhesiveness can be realized.

Further, in the first adherend 10 of the present embodiment, the contact angle is 80 to 180 ° on the surface of the first attachment surface 12 other than the release portion 11 formed adjacent to the corner 13. It is preferable that the portion is substantially nonexistent. The term "substantially nonexistent" here is permissible as long as the effects of the present invention are not impaired as a whole even if there are slight interspersed portions having contact angles of 80 to 180 °. Shall be. Further, more preferably, there is no portion of the first sticking surface 12 other than the mold release portion 11 formed adjacent to the corner 13 so that the contact angle is 90 to 160 °. ..

Further, on the first attachment surface 12 of the first adherend 10 of the present embodiment, the contact angle of the surfaces other than the release portion 11 is preferably 0 to 79 °, more preferably 10 to 75 °. Yes, more preferably 30-70 °. When the contact angle is in such a range, the adhesive tape 30 for fixing the first adherend 10 can be satisfactorily adhered.

It is preferable that the entire release portion 11 is covered on the surface of the first adherend 10 with the material forming the first adherend 10 in the range where the release portion 11 exists, for example. As described above, the release portion 11 may be formed in a dot shape by printing, and the release portion 11 may include a portion that is not partially covered (the entire scattered portion is released from the mold). It may be a part 11). In this case, the ratio of the area of the uncovered portion in the mold release portion 11 to the area of the mold release portion 11 is preferably 70% or less, more preferably 50% or less, still more preferably 30%. It is as follows.

Here, in the present embodiment, the first adherend 10 can be, for example, a battery, although it is not particularly limited as described above. When the first adherend 10 is a battery, the portion other than the release portion 11 forming the surface of the first adherend 10 can be formed of a battery packaging film. The packaging film for a battery is not particularly limited, but may be, for example, a laminated film in which at least a base material layer, an adhesive layer, a metal layer, and a sealant layer are sequentially laminated. With such a configuration, it is suitable for batteries, can be easily processed into various shapes, and can be made thinner and lighter.
When the battery packaging film is configured as described above, the base material layer side is the surface side of the battery, the sealant layer is the battery element side, and the sealant layers located on the peripheral edge of the battery element are heat-welded to each other at the time of assembly. By sealing the battery element, the battery element is sealed. Therefore, among the pair of surfaces of the battery packaging film, the release portion 11 is formed on the surface on the base material layer side.

Further, in the present embodiment, when the first adherend 10 is a battery, the battery may be either a primary battery or a secondary battery, but is preferably a secondary battery. The type of the secondary battery is not particularly limited, and for example, a lithium ion battery, a lithium ion polymer battery, a lead livestock battery, a nickel / hydrogen livestock battery, a nickel / cadmium livestock battery, a nickel / iron livestock battery, and a nickel / zinc livestock battery. Examples thereof include batteries, silver oxide / zinc livestock batteries, metal air batteries, polyvalent cation batteries, capacitors, capacitors and the like. Among these secondary batteries, examples of the battery include a lithium ion battery and a lithium ion polymer battery.

The shape of the battery can be arbitrary as described above, but for example, the thickness can be 0.1 to 50 mm, preferably 1 to 20 mm. The length can be 30 to 300 mm, preferably 50 to 150 mm. Further, the width can be 10 to 300 mm, preferably 20 to 140 mm.

(Adhesive tape)
The adhesive tape 30 that can be used in the present embodiment has an adhesive on both sides of the base material layer 31 having a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa, and the base material layer 31. It includes a layer 32. When the breaking elongation and breaking strength are within the above-mentioned predetermined ranges, the adhesive tape 30 can be easily peeled off without being torn.
Further, the shape of the adhesive tape 30 can be made arbitrary depending on the design of the adhesive body 1 and the first adherend 10 to which the adhesive tape 30 is attached. For example, as shown in FIG. 3, the end portion is formed. It is preferable to have a shape having two or more. Specifically, the adhesive tape 30 has rectangular portions constituting one end of the adhesive tape 30 as many as the number of ends of the adhesive tape 30, and one side of each rectangular portion is the adhesive tape 30. The adhesive tape 30 can be formed into a shape having two or more end portions by facing the center side of the adhesive tape and the other side (the side serving as the end portion) of the adhesive tape 30 facing the outside of the adhesive tape 30. More specifically, when the adhesive tape 30 has two ends, one side of the two rectangular portions is connected to each other so that the two rectangular portions are connected to each other, and FIG. 3 (a) shows. As a whole, it becomes a straight line (in this case, it also becomes a rectangle as a whole). When there are three or more ends, one side of the rectangular portion is connected toward the central portion of the adhesive tape 30, and the other side is formed to extend (spread) from the central portion toward the outside. This makes it possible to form a shape such as a Y shape (FIG. 3 (b)). The rectangular portion of the adhesive tape 30 does not have to be strictly rectangular, and may be curved as long as it has a long shape in one direction as a whole. Further, the shape of the entire adhesive tape 30 may be curved or bent. Further, the width of the adhesive tape 30 may change in the longitudinal direction.

Further, in the adhesive tape 30 of the present embodiment, the width of the adhesive tape 30 can be made arbitrary, but in particular, the end portion that can be the handle portion of the adhesive tape 30 has a length measured along the width direction. Is preferably 0.5 to 100 mm, more preferably 10 to 50 mm.
When the length is 0.5 to 100 mm, the size of the adhesive tape 30 can be made easy to use while ensuring the adhesiveness of the adhesive tape 30.
Further, the length of the entire adhesive tape 30 can be made arbitrary depending on the design of the adhesive body 1, the first adherend 10 to which the adhesive tape 30 is attached, and the like.

Further, in the present embodiment, as shown in FIG. 1, the portion of the adhesive tape 30 on the end side of the portion to be attached to the release portion 11 is located outside the first attachment surface 12. .. As shown in FIG. 1, the portion on the end side is a portion that is not sandwiched between the first sticking surface 12 of the first adherend 10 and the second sticking surface 21 of the second adherend 20. The adhesive tape 30 can be used as a handle portion to be gripped by the user when the adhesive tape 30 is peeled off.
As for the handle portion, a film 33 (not peeled) is attached to the surfaces of both sides of the adhesive layer 32 of the adhesive tape 30, or the adhesive tape 30 does not have the adhesive layer 32 (the base material on the end side). The layer 31 is extended).
Further, the length of the handle portion can be made arbitrary depending on the design of the adhesive body 1 and the first adherend body 10 to which the adhesive tape 30 is attached.

Examples of the material of the film 33 include cellophane, polyethylene, polypropylene, nylon, polystyrene, polyimide, polyester, tetrafluoroethylene and the like. Among them, polyester film, which is inexpensive and has excellent workability, and tetrafluoroethylene, which has excellent slipperiness, are preferable.

Subsequently, the configuration of the adhesive tape 30 will be described.
-Base layer-
As shown in FIG. 1, the pressure-sensitive adhesive tape 30 of the present embodiment has a base material layer 31 as a carrier of the pressure-sensitive adhesive layer 32.
The base material layer 31 of the adhesive tape 30 in the present embodiment has a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa.

The material of the base material layer 31 in the present embodiment is not particularly limited as long as the base material layer 31 has the above-mentioned breaking elongation and breaking strength, but contains, for example, a vinyl aromatic block copolymer (A). Is preferable. As the vinyl aromatic block copolymer (A) that can be used as the material of the base material layer 31, one kind or two or more kinds of copolymers selected from the block copolymers of the aromatic vinyl compound and the conjugated diene compound can be used. A styrene-based copolymer that can be used and the aromatic vinyl compound is styrene is preferable. Further, as the conjugated diene compound, isoprene, butadiene, ethylene butylene and ethylene propylene are preferable. Among them, the block copolymer (A) is a diblock copolymer such as a styrene-isoprene copolymer, a styrene-butadiene copolymer, a styrene-ethylenebutylene copolymer, and a styrene-ethylenepropylene copolymer. , Styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer and other triblock copolymers, preferably one or more copolymers, styrene-isoprene copolymer, styrene- One or more copolymers selected from butadiene copolymer, styrene-ethylenebutylene copolymer, styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylenebutylene copolymer The coalescence is more preferable, and the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer are particularly preferable.

The proportion of the vinyl aromatic block copolymer (A) contained in the material of the base material layer 31 in the present embodiment is preferably 50 to 100% by mass, preferably 60% by mass, when the material is 100% by mass. It is more preferably ~ 100% by mass, further preferably 65 to 100% by mass, and even more preferably 70 to 100% by mass. Within this range, excellent breaking elongation and breaking stress of the styrene-based copolymer can be obtained. Further, as the material of the base material layer 31 in the present embodiment, various thermoplastic resins such as polyolefin and polycarbonate can be used in addition to the vinyl aromatic block copolymer (A), and one or more of them can be used at the same time. can do.

As the styrene-based copolymer, the structural unit represented by the following chemical formula (1) is 13% by mass to 60% by mass with respect to the total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. It is preferable to use the one having a range, more preferably to use the one having a range of 15 to 50% by mass, further preferably to use the one having a range of 16 to 45% by mass, and 17 to 35. It is even more preferable to use a polymer having a mass in the range of% by mass. As a result, the elongation at break and the stress at break can be easily obtained in a suitable range.

As the styrene-based copolymer, one containing two or more kinds of copolymers having different structures is used, and one containing a combination of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer is used. be able to.
The styrene-based copolymer contains the styrene-isoprene copolymer in the range of 0% by mass to 80% by mass with respect to the total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. It is preferable to use a polymer containing styrene, more preferably a polymer contained in the range of 0% by mass to 70% by mass, and further preferably using a polymer contained in the range of 0% by mass to 50% by mass. , It is more preferable to use in the range of 0% by mass to 30% by mass. Within the above range, it is possible to achieve both thermal durability while maintaining excellent breaking elongation and breaking stress.

Further, as the styrene-isoprene copolymer, the weight average molecular weight (gel permeation chromatography, SC-8020 manufactured by Toso Co., Ltd., high molecular weight column TSKgelGMHR) measured in terms of standard polystyrene using a gel permeation chromatograph (GPC). -H, solvent: tetrahydrofuran) is preferably in the range of 10,000 to 800,000, more preferably in the range of 30,000 to 500,000, and in the range of 50,000 to 300,000. It is even more preferable to use one that is. Within the above range, it is more preferable to obtain an adhesive tape 30 having thermal durability while having good workability in the manufacturing process because heat fluidity and compatibility at the time of solvent dilution can be ensured.

As the styrene-based copolymer, for example, one having a single structure such as a linear structure, a branched structure or a multi-branched structure can be used, but those having different structures can also be mixed and used. .. The styrene-based copolymer rich in linear structure gives the adhesive tape 30 of the present embodiment excellent elongation at break. 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 according to the required mechanical characteristics.

The method for producing the styrene-isoprene-styrene copolymer is not particularly limited, and conventionally known production methods can be applied. For example, a method of sequentially polymerizing a styrene block and an isoprene block by an anion-living polymerization method, or a block copolymer having a living active terminal and then reacting with a coupling agent to produce a coupled block copolymer is produced. There is a way.

The method for producing the styrene-isoprene copolymer is not particularly limited, and conventionally known production methods can be applied. For example, there is a method of sequentially polymerizing a styrene block and an isoprene block by an anion living polymerization method.

The method for producing the mixture of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer is not particularly limited, and conventionally known production methods can be applied. For example, there is a method in which the styrene-isoprene copolymer produced above and the styrene-isoprene-styrene copolymer are mixed and used. It is also possible to produce a mixture at the same time in one polymerization step. As a more specific embodiment, a polystyrene block having a living active terminal is firstly polymerized by an anionic living polymerization method using an anionic polymerization initiator in a polymerization solvent. To form. Secondly, isoprene is polymerized from the living-active terminal of the polystyrene block to obtain a styrene-isoprene block copolymer having a living-active terminal. Subsequently, thirdly, a part of the styrene-isoprene block copolymer having the living active terminal is reacted with the 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 with a polymerization inhibitor to deactivate the living active end to form a styrene-isoprene block copolymer. To form.

--Adhesive-imparting resin ---
Further, in the present embodiment, a tackifier resin can be used for the base material layer 31 for the purpose of enhancing the adhesion with the pressure-sensitive adhesive layer 32 and enhancing the heat resistance. Among them, a tackifier resin having a softening point of 80 ° C. or higher can be preferably used, and the softening point is more preferably 90 ° C. or higher, further preferably 100 ° C. or higher, and even more preferably 110 ° C. or higher. preferable. The softening point refers to a value measured by a method (dry-bulb type) specified in JIS K2207.

As the tackifier resin, for example, a solid state at room temperature (23 ° C.) is preferably used, and petroleum resins such as C5 petroleum resin, C5 / C9 petroleum resin, and alicyclic petroleum resin are used. can do.
The petroleum resin is easily compatible with the polyisoprene structure constituting the styrene-isoprene block copolymer or the styrene-isoprene block-styrene copolymer, and as a result, the initial adhesive strength and thermal durability of the adhesive tape 30 are improved. It can be further improved.
As the C5 petroleum resin, an aliphatic petroleum resin can be used, for example, Escolets 1202, 1304, 1401 (manufactured by Tonen Chemical Corporation), Wing Tuck 95 (manufactured by Goodyear Tire and Rubber Company). ), Quinton K100, R100, F100 (manufactured by Nippon Zeon Corporation), Pico Tack 95, Pico Pale 100 (manufactured by Rika Hercules) and the like can be used.

As the C5-based / C9-based petroleum resin, a copolymer of the above-mentioned C5-based petroleum resin and C9-based petroleum resin can be used. ), Harcotac 1149 (manufactured by Rika Hercules) and the like can be used.
The alicyclic petroleum resin is obtained by hydrogenating the C9 petroleum resin described above. For example, Escolets 5300 (manufactured by Tonex), Archon P-100 (manufactured by Arakawa Chemical Industries), Rigalite R101 (Rika Fine). (Made by Tech) etc. can be used.

Examples of the tackifier resin include polymerized rosin-based resin, C9-based petroleum resin, terpene-based resin, and rosin-based resin, in addition to the C5-based petroleum resin, C5-based / C9-based petroleum resin, and alicyclic petroleum resin. , Terpen-phenol resin, styrene resin, kumaron-inden resin, xylene resin, phenol resin and the like can be used.
Among them, it is preferable to use the C5 petroleum resin and the polymerized rosin resin in combination as the tackifier resin in order to achieve both excellent initial adhesiveness and thermal durability.

The tackifier resin is preferably used in the range of 0% by mass to 100% by mass, and 0% by mass to 70% by mass, based on the total amount of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. It is more preferable to use it in the range of 0% by mass to 50% by mass, and even more preferably it is used in the range of 0% by mass to 30% by mass. By using it in the above range, it becomes easy to achieve both excellent breaking elongation and thermal durability of the adhesive tape 30 while enhancing the interfacial adhesion between the pressure-sensitive adhesive layer 32 and the base material layer 31.

--Other ingredients ---
Further, in the present embodiment, the resin base material contains other polymer components, a cross-linking agent, an antioxidant, an ultraviolet absorber, a filler, a polymerization inhibitor, and a surface adjustment, if necessary, as long as the characteristics are not impaired. Agents, antistatic agents, antifoaming agents, viscosity modifiers, light-resistant stabilizers, weather-resistant stabilizers, heat-resistant stabilizers, antioxidants, leveling agents, organic pigments, inorganic pigments, pigment dispersants, silica beads, organic beads, etc. Additives; those containing inorganic fillers such as silicon oxide, aluminum oxide, titanium oxide, zirconia, and antimony pentoxide can be used.

--Characteristics of base layer ---
The thickness of the base material is preferably 10 to 2490 μm, more preferably 30 to 300 μm, further preferably 60 to 200 μm, and even more preferably 70 μm to 1150 μm. When the thickness of the base material is within the above range, the adhesive tape 30 can easily follow the strain of the adherend and obtain high adhesive strength, and the stress required for peeling the adhesive tape 30 while stretching it can be obtained. It is preferable because it does not become too large.

The elongation at break of the base material layer 31 is 200 to 3000%, preferably 650 to 2800%, more preferably 700 to 2700%, and even more preferably 750 to 2600%. .. When the breaking elongation of the base material layer 31 is equal to or higher than the lower limit of the above range, the adhesive tape 30 is stretched when the adhesive tape 30 is peeled off even when the adhesive tape 30 is firmly adhered to the adherend. Therefore, the stress does not become too large, and the adhesive tape 30 can be easily peeled off without being excessively stretched even in the peeling step. Further, when the breaking elongation of the base material layer 31 is not more than the upper limit of the above range, the stretching distance of the adhesive tape 30 when peeling the adhesive tape 30 does not become too long, and the work in a small space becomes possible. preferable.

The breaking strength of the base material layer 31 is 1.5 to 80 MPa, preferably 2.0 to 60 MPa, more preferably 2.5 to 50 MPa, and 3.0 to 40 MPa. Is even more preferable. When the breaking strength of the base material layer 31 is at least the lower limit of the above range, it is possible to prevent the adhesive tape 30 from being torn even when the adhesive tape 30 is stretched and peeled off, so that the adhesive tape 30 can be stretched. Since the load does not become excessive, the peeling work by peeling becomes easy. Further, the force required to stretch and deform the adhesive tape 30 also depends on the thickness of the adhesive tape 30. For example, when the adhesive tape 30 having a large thickness and high breaking strength is stretched and attempted to be peeled off, it cannot be stretched sufficiently and peeled off.

The stress at 25% elongation of the base material layer 31 is preferably 0.15 to 10.0 MPa, more preferably 0.25 to 7.0 MPa, and preferably 0.35 to 5.0 MPa. It is even more preferably 0.45 to 2.0 MPa, even more preferably 0.45 to 2.0 MPa. When the 25% elongation stress of the adhesive tape 30 is within the above range, the adhesive strength suitable for the adhesive tape 30 can be obtained, and the adhesive tape 30 can be peeled off relatively easily even in the peeling step. If it is less than the above range, there is a concern that the adhesive tape 30 may be peeled off when a load is applied to the adhesive tape 30 in the shearing direction while fixing the hard adherends to each other. On the other hand, if it exceeds the above range, the force required to extend the adhesive tape 30 becomes excessive in the peeling step of the adhesive tape 30.

The stress at 50% elongation of the base material layer 31 is preferably 0.15 to 10.5 MPa, more preferably 0.25 to 7.5 MPa, and preferably 0.35 to 5.0 MPa. It is even more preferably 0.5 to 2.5 MPa, even more preferably. When the stress at 50% elongation of the adhesive tape 30 is within the above range, the adhesive strength suitable for the adhesive tape 30 can be obtained, and the adhesive tape 30 can be peeled off relatively easily even in the peeling step. If it is less than the above range, there is a concern that the adhesive tape 30 may be peeled off when a load is applied to the adhesive tape 30 in the shearing direction while fixing the hard adherends to each other. On the other hand, if it exceeds the above range, the force required to extend the adhesive tape 30 becomes excessive in the peeling step of the adhesive tape 30.

The 50% elongation stress of the base material layer 31 is preferably 100 to 160%, more preferably 103 to 150%, and even more preferably 105 to 140% of the 25% elongation stress. It is even more preferable that it is 110 to 130%.
When the 50% elongation stress of the adhesive tape 30 is within the above range with respect to the 25% elongation stress of the adhesive tape 30, the stress required for peeling the adhesive tape 30 at the time of peeling can be stabilized. ..

The storage elastic modulus E'(23 ° C.) of the base material layer 31 is preferably 1.0 × 10 ^{4 to} 1.0 × 10 ⁸ Pa, and 5.0 × 10 ^{4 to} 5.0 × 10 ⁷ Pa. It is more preferably 1.0 × 10 ^{5 to} 1.0 × 10 ⁷ Pa, and even more preferably ^{3.0 × 10 5 to} 7.0 × 10 ^{6 Pa.} When the breaking point stress of the base material layer 31 is within the above range, it is easy to follow the strain of the adherend and obtain excellent adhesive strength, and the dimensional stability of the adhesive tape 30 can be ensured. Therefore, suitable sticking workability can be obtained.

The base material layer 31 is provided with a primer layer for the purpose of further improving the adhesion to the pressure-sensitive adhesive layer 32, surface unevenness treatment by a sandblasting method, a solvent treatment method, or the like, corona discharge. Those subjected to surface treatment such as treatment, chromic acid treatment, flame treatment, hot air treatment, ozone treatment, ultraviolet irradiation treatment, and oxidation treatment can be used.

Examples of the method for producing the base material layer 31 include 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 them, the cast method by extrusion molding, the uniaxial stretching method, the sequential secondary stretching method, the simultaneous biaxial stretching method, the inflation method, and the tube method can be preferably used, and the mechanical strength required for the adhesive tape 30 of the present embodiment can be preferably used. It may be selected according to.

The base material layer 31 may have a single-layer structure, a two-layer structure, a three-layer structure, or a multi-layer structure. In the case of a multi-layer structure, it is preferable that at least one layer is a layer having the above-mentioned resin composition because it is easy to exhibit the required mechanical properties. Further, for example, a base material layer 31 having a three-layer structure can be obtained by a method of coextruding a thermoplastic resin such as polypropylene and the styrene-isoprene-styrene copolymer. This may be used as a suitable configuration for the adhesive tape 30 of the present embodiment, for example, when it is desired to have appropriate dimensional stability and elasticity.

-Adhesive layer-
In the present embodiment, the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 32 is not particularly limited, but one having good adhesion to the base material layer 31 can be used, for example, an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive. Examples include agents and silicone-based adhesives. Further, in the present embodiment, a water-dispersible emulsion type pressure-sensitive adhesive can also be used as the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 32.
In the present embodiment, an acrylic pressure-sensitive adhesive is preferable because a relatively strong adhesive force can be easily obtained.

--Acrylic adhesive ---
The acrylic pressure-sensitive adhesive is not particularly limited, and includes, for example, at least one type of acrylic polymer containing a (meth) acrylic acid alkyl ester monomer as a monomer unit. The (meth) acrylic acid alkyl ester monomer is, for example, a (meth) acrylic acid alkyl ester having 2 to 14 carbon atoms in the alkyl group, and examples thereof are not particularly limited, but ethyl acrylate and acrylic. Propyl acid, butyl acrylate, isobutyl acrylate, isoamyl acrylate, hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, isonolyl acrylate, isodecil acrylate, butyl methacrylate, hexyl methacrylate, methacryl Examples thereof include isodecyl acid acid and lauryl methacrylate.
In addition, in this specification, "(meth) acrylic acid alkyl ester" means acrylic acid alkyl ester or methacrylic acid alkyl ester.

The acrylic polymer may be copolymerized with an acrylic acid ester having a polar group such as a hydroxyl group, a carboxyl group, or an amino group in the side chain or another vinyl monomer in the range of 0.1 to 15% by mass. preferable. Further, it is preferable to copolymerize the acrylic acid unit in the range of 2 to 10% by mass because of its excellent adhesiveness.
As a result, the structural units derived from these monomers serve as cross-linking points in the acrylic polymer, and the hardness of the adhesive component can be adjusted to develop the desired adhesive force.

The acrylic polymer can be obtained by copolymerizing by a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, an ultraviolet irradiation method, or an electron beam irradiation method. The weight average molecular weight of the acrylic polymer is preferably 400,000 to 1.4 million, more preferably 600,000 to 1.2 million, in order to achieve both coatability and adhesive physical properties. The weight average molecular weight is converted to standard polystyrene by gel permeation chromatography (GPC). As the measurement conditions, TSKgel GMHXL [manufactured by Tosoh] is used as the column, the column temperature is 40 ° C., the eluent is tetrahydrofuran, the flow rate is 1.0 mL / min, and TSK standard polystyrene is used as the standard polystyrene.

Further, in order to increase the cohesive force of the pressure-sensitive adhesive, it is preferable to add a cross-linking agent. Examples of the cross-linking agent include an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, and a chelate-based cross-linking agent. In particular, when the pressure-sensitive adhesive layer 32 is provided, it is preferable to use an isocyanate-based cross-linking agent or an epoxy-based cross-linking agent. The amount of the cross-linking agent added is preferably adjusted so that the gel fraction of the pressure-sensitive adhesive layer 32 is 25 to 80%. A more preferred gel fraction is 30-70%. Among them, 35 to 60% is the most preferable. When the gel fraction is 25% or more, the adhesive has an appropriate cohesive force, so that deviation is unlikely to occur in the keystroke test. On the other hand, when the gel fraction is 80% or less, the adhesive does not become too hard, and the adhesive force to the adherend such as a substrate is good. Adhesiveness is reduced. The gel fraction is expressed as a percentage of the original mass by immersing the composition of the pressure-sensitive adhesive layer 32 after curing in toluene and measuring the mass of the insoluble matter remaining after being left for 24 hours after drying.

--Rubber adhesive ---
As the rubber-based pressure-sensitive adhesive, one or more of natural rubber-based polymers such as natural rubber and its modified products, synthetic rubber-based polymers, and rubber-based polymers such as vinyl aromatic block copolymer (B) are used. include.
Further, as the rubber-based pressure-sensitive adhesive, those containing a vinyl aromatic block copolymer (B) are preferable. Among them, one or more copolymers selected from the block copolymers of the aromatic vinyl compound and the conjugated diene compound can be used, and a styrene-based copolymer in which the aromatic vinyl compound is styrene is preferable. .. Further, as the conjugated diene compound, isoprene, butadiene, ethylene butylene and ethylene propylene are preferable. Among them, the block copolymer (B) is a diblock copolymer such as a styrene-isoprene copolymer, a styrene-butadiene copolymer, a styrene-ethylenebutylene copolymer, and a styrene-ethylenepropylene copolymer. , Styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer and other triblock copolymers, preferably one or more copolymers, styrene-isoprene copolymer, styrene- One or more copolymers selected from a butadiene copolymer, a styrene-ethylenebutylene copolymer, a styrene-isoprene-styrene copolymer, and a styrene-butadiene-styrene copolymer are more preferable, and styrene-isoprene is more preferable. One or more copolymers selected from the copolymer and the styrene-isoprene-styrene copolymer are particularly preferable.

The vinyl aromatic block copolymer contains 10% by mass to 80% by mass of the structural unit represented by the following chemical formula (2) with respect to the total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. It is preferable to use one having a mass in the range of 12 to 60% by mass, more preferably one having a range of 12 to 60% by mass, and even more preferably one having a range of 15 to 40% by mass17. It is even more preferable to use those having a range of ~ 35% by mass. Thereby, excellent adhesiveness and heat resistance can be obtained.

As the vinyl aromatic block copolymer, one containing two or more kinds of copolymers having different structures can be used, and a combination of a styrene-isoprene copolymer and a styrene-isoprene-styrene copolymer is contained. You can use what you want.
The styrene-based resin contains the styrene-isoprene copolymer in the range of 0% by mass to 80% by mass with respect to the total mass of the styrene-isoprene copolymer and the styrene-isoprene-styrene copolymer. It is preferable to use the one containing in the range of 0% by mass to 77% by mass, further preferably the one containing in the range of 0% by mass to 75% by mass, and further preferably 0. It is even more preferable to use in the range of mass% to 70% by mass. Within the above range, the adhesive tape 30 of the present embodiment can have both excellent adhesive performance and thermal durability.

Further, as the styrene-isoprene copolymer, the weight average molecular weight (gel permeation chromatography, SC-8020 manufactured by Toso Co., Ltd., high molecular weight column TSKgelGMHR) measured in terms of standard polystyrene using a gel permeation chromatograph (GPC). -H, solvent: tetrahydrofuran) is preferably in the range of 10,000 to 800,000, more preferably in the range of 30,000 to 500,000, and in the range of 50,000 to 300,000. It is even more preferable to use one that is. Within the above range, it is more preferable to obtain an adhesive tape 30 having thermal durability while having good workability in the manufacturing process because heat fluidity and compatibility at the time of solvent dilution can be ensured.

As the styrene-based copolymer, for example, one having a single structure such as a linear structure, a branched structure or a multi-branched structure can be used, but those having different structures can also be mixed and used. .. When a styrene-based resin having abundant linear structures is used for the pressure-sensitive adhesive layer 32, the pressure-sensitive adhesive tape 30 of the present embodiment is provided with excellent adhesive performance. 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. .. It is preferable to mix and use these according to the required characteristics.

The method for producing the styrene-isoprene-styrene copolymer is not particularly limited, and a conventionally known production method can be applied, and the styrene-isoprene-styrene copolymer can be produced by the same method as described for the base material layer 31.

--Adhesive-imparting resin ---
Further, in the present embodiment, it is preferable to add a tackifier resin in order to improve the adhesive strength of the pressure-sensitive adhesive layer 32. The tackifier resin added to the pressure-sensitive adhesive layer 32 of the pressure-sensitive adhesive tape 30 of the present embodiment is a rosin-based resin such as rosin or an esterified product of rosin; a terpene-based resin such as a diterpene polymer or an α-pinene-phenol copolymer; Petroleum resins such as aliphatic (C5) and aromatic (C9); other examples include styrene resins, phenolic resins, and xylene resins. Further, an acrylic resin other than the acrylic copolymer may be added as a tackifier resin.

When the pressure-sensitive adhesive resin is an acrylic polymer, it is preferable to add 10 to 60 parts by mass with respect to 100 parts by mass of the acrylic polymer. When importance is attached to adhesiveness, it is most preferable to add 20 to 50 parts by mass. When the pressure-sensitive adhesive resin is a rubber-based resin, it is preferable to add 80 to 150 parts by mass of the tackifier resin to 100 parts by mass of the rubber-based resin. Generally, when the pressure-sensitive adhesive resin is a silicone-based resin, the pressure-sensitive adhesive resin is not added.

When the pressure-sensitive adhesive of the pressure-sensitive adhesive tape 30 contains the vinyl aromatic block copolymer (B), the pressure-sensitive adhesive resin that can be contained in the pressure-sensitive adhesive is a pressure-sensitive adhesive resin having a softening point of 80 ° C. or higher. It is preferable to use it. Thereby, the pressure-sensitive adhesive and the pressure-sensitive adhesive tape 30 having excellent initial adhesiveness and thermal durability can be obtained. The softening point refers to a value measured by a method (dry-bulb type) specified in JIS K2207.

As the tackifying resin, for example, a solid resin at room temperature (23 ° C.) is preferably used, and petroleum resins such as C5 petroleum resin, C5 / C9 petroleum resin, and alicyclic petroleum resin are used. be able to. The petroleum resin is easily compatible with the polyisoprene structure constituting the styrene resin, and as a result, the initial adhesive strength and thermal durability of the pressure-sensitive adhesive and the pressure-sensitive adhesive tape 30 can be further improved.
As the C5 petroleum resin, an aliphatic petroleum resin can be used, for example, Escolets 1202, 1304, 1401 (manufactured by Tonen Chemical Corporation), Wing Tuck 95 (manufactured by Goodyear Tire and Rubber Company). ), Quinton K100, R100, F100 (manufactured by Nippon Zeon Corporation), Pico Tack 95, Pico Pale 100 (manufactured by Rika Hercules) and the like can be used.

As the C5-based / C9-based petroleum resin, a copolymer of the above-mentioned C5-based petroleum resin and C9-based petroleum resin can be used. ), Harcotac 1149 (manufactured by Rika Hercules) and the like can be used.
The alicyclic petroleum resin is obtained by hydrogenating the C9 petroleum resin described above. For example, Escolets 5300 (manufactured by Tonex), Archon P-100 (manufactured by Arakawa Chemical Industries), Rigalite R101 (Rika Fine). (Made by Tech) etc. can be used.

Examples of the tackifier resin having a softening point of 80 ° C. or higher include a polymer rosin resin and a C9 petroleum resin, in addition to the C5 petroleum resin, the C5 / C9 petroleum resin, and the alicyclic petroleum resin. A terpene resin, a rosin resin, a terpen-phenol resin, a styrene resin, a kumaron-inden resin, a xylene resin, a phenol resin and the like can be used.
Among them, as the tackifier resin having a softening point of 80 ° C. or higher, using the C5 petroleum resin and the polymerized rosin resin in combination achieves even better initial adhesiveness and thermal durability. It is preferable to the above.
The tackifier resin having a softening point of 80 ° C. or higher is preferably used in the range of 3% by mass to 100% by mass with respect to the total amount of the styrene-based resin, and is used in the range of 5% by mass to 80% by mass. It is more preferable, and it is more preferable to use it in the range of 5% by mass to 80% by mass in order to obtain the pressure-sensitive adhesive and the pressure-sensitive adhesive tape 30 having both further excellent adhesiveness and excellent 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 the tackifier resin having a softening point of 80 ° C. or higher. The pour point refers to a value measured by a method according to the method specified in JIS K2269.
As the tackifier resin having a softening point of −5 ° C. or lower, it is preferable to use a tackifier resin that is liquid at room temperature. The tackifier resin that is liquid at room temperature is preferably selected from the above-mentioned tackifier resins known.
As the tackifier resin having a softening point of −5 ° C. or lower, for example, process oil, polyester, liquid rubber such as polybutene, or the like can be used, and among them, using polybutene is even more excellent in initial adhesion. It is preferable for expressing sex.

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

The mass 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 preferably in the range of 5 to 50, and preferably in the range of 10 to 30. It is more preferable to obtain the pressure-sensitive adhesive and the pressure-sensitive adhesive tape 30 that have both excellent initial adhesiveness and excellent holding power.

The styrene resin and the tackifier resin are preferably used in combination in a mass ratio of 0.5 to 10.0, which is represented by [styrene resin / tackifier resin], and is preferably 0.6 to 10.0. When used in the range of 9.0, the initial adhesive strength can be improved and excellent thermal durability can be obtained. Further, the mass ratio [styrene resin / adhesive-imparting resin] is larger than 1, for example, to prevent peeling due to the repulsive force of the adhesive tape 30 when attached to a curved surface portion of an adherend or the like (resistant to adhesive). It is preferable in terms of resilience).

--Filler particles ---
In the present embodiment, the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 32 preferably contains filler particles.
Since the pressure-sensitive adhesive contains filler particles, the filler particles are exposed from the pressure-sensitive adhesive layer 32 when the pressure-sensitive adhesive sheet is stretched, which reduces the adhesive area between the pressure-sensitive adhesive layer 32 and the adherend. Even if the extension direction is a high angle such as the direction perpendicular to the attachment surface of the attachment target (hereinafter, also referred to as "adhesive body") (sometimes referred to as "90 ° direction"), the extension is easily performed. Can be peeled off.

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, titanium nitride, and the like. Of silicon dioxide, titanium boring, 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, fused silica, crystalline silica, ultrafine atypical silica, etc.), potassium titanate, magnesium sulfate, sepiolite, zonolite, hoe Aluminum oxide, barium sulfate, barium titanate, zirconia oxide, cerium, tin, indium, carbon, sulfur, terium, cobalt, molybdenum, strontium, chromium, barium, lead, tin oxide, indium oxide, diamond, magnesium, platinum, zinc , Manganese, stainless steel and the like. 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.

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, silicon-based fillers, and fluorine-based fillers. , Acrylic filler, Polycarbonate filler, Polyurethane filler, Polyamide filler, Epoxy resin filler, Thermocurable resin hollow filler and the like.

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 elliptical, spherical, or polygonal, the pressure-sensitive adhesive layer 32 slides well to the adherend when the pressure-sensitive adhesive sheet is stretched, and the stretch direction of the pressure-sensitive adhesive sheet is the attachment of the adherend. It can be easily stretched and peeled even in the 90 ° direction with respect to the surface.

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 is preferably 2.5 to 20, and 2.5 in terms of impact resistance. ~ 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 above-mentioned 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 sticking surface of the adherend. Even when the base material of the sheet is thin, it is hard 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 stretch peelability when the stretch direction of the pressure-sensitive adhesive sheet is 90 ° with respect to the sticking surface of the adherend. 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 (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, for example, a measuring machine (microtrack) using a laser diffraction / scattering method. You can get it.

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 size 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 pressure-sensitive adhesive layer 32, which will be 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 pressure-sensitive adhesive layer 32, which is represented by [average thickness of the pressure-sensitive adhesive layer], is preferably 5/100 or more, preferably 5/100 to 95/100. More preferably, 10/100 to 75/100 is further preferable, and 20/100 to 60/100 is particularly preferable. When the ratio is within a 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. But it's hard to tear. Further, when the ratio is within the particularly 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 sticking surface of the adherend, and the thickness of the base material of the pressure-sensitive adhesive sheet is increased. Even if it is thin, it is not easily torn, and it is advantageous in that it has better adhesive performance such as impact resistance, shear adhesive force, and split adhesive force. On the other hand, if the ratio is less than 5/100, the stretchability when the stretch direction of the adhesive sheet is 90 ° with respect to the sticking surface of the adherend may be impaired, and if it exceeds 95/100. , Impact resistance, shear adhesive strength, split adhesive strength, and other adhesive performance may be impaired.

The content of the filler particles in the pressure-sensitive adhesive layer 32 is preferably 9 to 50% by mass, more preferably 13 to 34% by mass, and 17 to 30% by mass with respect to 100% by mass of the pressure-sensitive adhesive. It is more preferable to have. If the content of the filler particles with respect to 100% by mass of the pressure-sensitive adhesive is less than 9% by mass, 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. The adhesive sheet does not stretch and cannot be peeled off. Further, when the content of the filler particles with respect to 100% by mass of the pressure-sensitive adhesive exceeds 50% by mass, the pressure-sensitive adhesive sheet does not stretch, the pressure-sensitive adhesive composition remains on the adherend, the impact resistance deteriorates, and shearing occurs. Adhesive strength and split adhesive strength may be weakened. On the other hand, when the content of the filler particles with respect to 100% by mass of the pressure-sensitive adhesive is 9 to 50% by mass, 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 sticking surface of the adherend. Even when the base material of the adhesive sheet is thin, it is hard to tear and has excellent impact resistance, shear adhesive strength, and split adhesive strength.
The content of the filler particles in the pressure-sensitive adhesive layer 32 can be appropriately adjusted when preparing the pressure-sensitive adhesive.

The volume ratio of the filler particles to the volume of the entire pressure-sensitive adhesive layer 32 is 4% to 40%, preferably 5% to 30%, more preferably 5% to 20%, still more preferably 5% to 15%.
stomach. 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, and the pressure-sensitive adhesive sheet is torn. The adhesive sheet does not stretch and cannot be peeled off. Further, when the volume ratio of the filler particles exceeds 40%, the adhesive sheet does not stretch, the adhesive remains on the adherend, the impact resistance deteriorates, and the shear adhesive force and the split adhesive force are weak. May become. On the other hand, when the volume ratio of the filler particles is 4% to 40%, 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 sticking surface of the adherend, and the base material of the pressure-sensitive adhesive sheet can be easily stretched and peeled off. It is hard to tear even when the thickness of the particle 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 pressure-sensitive adhesive layer 32 can be calculated from the following formulas (1) to (3).
Adhesive resin ^{* 1} mass A (g) / density A (g / cm ³⁾ of the adhesive resin ^{* 1} = adhesive resin ^{* 1}
Volume A (cm ³ ) ・ ・ ・ Equation (1)
Filler particle mass 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, if necessary.
The density is a value measured according to JIS Z 8804.

--Characteristics of the adhesive in the adhesive layer ---
In the present embodiment, the loss tangent of the dynamic viscoelastic spectrum of the pressure-sensitive adhesive at a frequency of 1 Hz is preferably 0.5 to 0.8 at 70 ° C. More preferably, it is 0.55 to 0.75. If it is 0.5 or more, the peeling resistance is excellent, and if it is 0.8 or less, the amount of the adhesive oozing out to the printed portion at high temperature tends to be small.

The thickness of the pressure-sensitive adhesive layer 32 is not particularly limited, but is preferably 5 to 100 μm, more preferably 5 to 75 μm, and even more preferably 10 to 60 μm. Within this range, it is easy to achieve both adhesiveness and thin tape.

The pressure-sensitive adhesive layer 32 of the pressure-sensitive adhesive tape 30 of the present embodiment has a stress at 50% elongation of 0.05 to 10.5 MPa, more preferably 0.07 to 7.5 MPa, and 0.1 to 5 MPa. It is more preferably 5.5 MPa, and even more preferably 0.15 to 3.5 MPa. When the stress at 50% elongation of the pressure-sensitive adhesive layer 32 is within the above range, excellent adhesiveness and peelability of the pressure-sensitive adhesive tape 30 can be obtained. That is, it is easy to follow the strain of the adherend and obtain excellent adhesive strength, and it is possible to prevent the pressure-sensitive adhesive layer 32 from remaining on the adherend in the peeling step of the adhesive tape 30.

The pressure-sensitive adhesive layer 32 of the pressure-sensitive adhesive tape 30 of the present embodiment has a storage elasticity G'(23 ° C.) of 1.0 × 10 ^{5 to} 1.0 × 10 ⁷ Pa, but 1.0 × 10 ⁵ to 8. .0 × 10 ⁶ Pa is preferable, 1.0 × 10 ^{5 to} 5.0 × 10 ^{6 Pa is more preferable, 1.0 × 10 5 to} 4.0 × 10 ⁶ Pa is more preferable, and 1.0 × 10 is more preferable. Most preferably ^{5 to} 3.0 × 10 ^{6 Pa.} When the storage elastic modulus G'(23 ° C.) of the pressure-sensitive adhesive layer 32 is within the above range, excellent adhesiveness and peelability of the pressure-sensitive adhesive tape 30 can be obtained, and it is particularly used in a high temperature or high humidity environment. Even after that, it is possible to prevent the adhesive layer 32 from remaining on the adherend in the peeling step of the adhesive tape 30.

The thickness of the pressure-sensitive adhesive layer 32 is preferably 1/2 to 1/500, more preferably 1/3 to 1/300, and 1/5 to 1 with respect to the thickness of the base material layer 31. It is more preferably / 200, and even more preferably 1/10 to 1/50. When the thickness ratio of the pressure-sensitive adhesive layer 32 and the base material layer 31 of the pressure-sensitive adhesive tape 30 is within the above range, excellent adhesiveness and peelability of the pressure-sensitive adhesive tape 30 can be obtained. In the adhesive tape 30 of the present embodiment, the cohesive force of the adhesive layer 32 is lower than the cohesive force of the base material layer 31, so if the adhesive layer 32 is thicker than the above range, the adhesive tape 30 is peeled off. Only the pressure-sensitive adhesive layer 32 may remain on the adherend. Further, when the pressure-sensitive adhesive layer 32 is thinner than the above range, there is a concern that the pressure-sensitive adhesive layer 32 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.

The breaking point stress of the pressure-sensitive adhesive layer 32 used for the pressure-sensitive adhesive tape 30 of the present embodiment is preferably 0.5 to 25.0 MPa, more preferably 0.8 to 20.0 MPa, and 1.0. It is more preferably ~ 17.0 MPa, and even more preferably 1.2 to 15.0 MPa. When the breaking point stress of the pressure-sensitive adhesive layer 32 is within the above range, excellent adhesiveness can be exhibited, and the pressure-sensitive adhesive component remains in the adherend state when the pressure-sensitive adhesive tape 30 of the present embodiment is stretched and peeled off. It is preferable because it is difficult.

-Manufacturing method of adhesive tape-
The adhesive tape 30 of the present embodiment is not particularly limited and can be produced, for example, by a known method. Specifically, the adhesive tape 30 forms the adhesive layers 32 on both sides of the adhesive tape 30 by applying an adhesive to the surface of the release film (release paper) and drying the adhesive tape 30. Next, the pressure-sensitive adhesive layer 32 having the above-mentioned release film is attached to both surfaces of the prepared base material layer 31, and if necessary, pressure is applied to obtain a laminate. Then, the adhesive tape 30 can be obtained by cutting it into a desired shape.

-Characteristics of adhesive tape-
The total thickness of the adhesive tape 30 of the present embodiment is preferably 50 to 3000 μm, more preferably 70 to 500 μm, and even more preferably 100 to 300 μm.

The adhesive tape 30 of the present embodiment preferably has an adhesive strength of 1 to 50 N / 20 mm, more preferably 10 to 30 N / 20 mm, and further preferably 15 to 20 mm, as measured by the method described in Examples described later. It is 25N / 20mm. By setting the above range, it is easy to achieve both resistance to tearing of the tape at the time of disassembly and adhesiveness.

<< How to assemble the adhesive >>
The method for assembling the adhesive body of the present embodiment is a method for assembling the adhesive body 1 according to the above-described embodiment of the present invention, in which the adhesive tape 30 separates the first adherend 10 and the adhesive tape 30. It is characterized by including a step of bonding so as to be located on the mold portion 11.
Specifically, first, the adhesive tape 30 is attached to the first attachment surface 12 of the first adherend 10. At this time, the adhesive tape 30 is attached so as to be located on the release portion 11. Further, the portion of the adhesive tape 30 on the end side (handle portion) of the portion sticking to the release portion 11 is located outside the first sticking surface 12. Then, the first adherend 10 can be assembled by sticking the first adherend 10 to the second adherend 20.
Alternatively, instead of the above method, first, the adhesive tape 30 is attached to the second attachment surface 21 of the second adherend 20. At this time, the adhesive tape 30 is attached so as to be located at the position of the second attachment surface 21 where the release portion 11 is located. More specifically, the adhesive tape 30 is attached so that the boundary between the handle portion of the adhesive tape 30 and the adhesive layer 32 is located at the position of the second attachment surface 21 where the corner 13 adjacent to the release portion 11 is located. Then, the first adherend 10 can be assembled by sticking the first adherend 10 to the second adherend 20.
According to the above-described method for assembling the adhesive body of the present embodiment, when the adhesive tape 30 is peeled off from the first adherend 10 at an angle with respect to the sticking surface, the load on the adhesive tape 30 is reduced to prevent tearing. can do.

《How to disassemble the adhesive》
Further, the method for disassembling the adhesive body of the present embodiment is a method for disassembling the adhesive body 1 according to the above-described embodiment of the present invention, from the portion of the adhesive tape 30 that sticks to the release portion 11. It is characterized by including a step of pulling the portion on the end side at an angle of 60 ° or more with respect to the sticking surface. In this way, the portion of the adhesive tape 30 that is closer to the end than the portion that is attached to the release portion 11 (the portion that is located along the side surface of the first adherend 10 in FIG. 1) is attached to the attachment surface. By pulling at an angle of 60 ° or more with respect to the adhesive body 1, the adhesive tape 30 is peeled off and the first adherend 10 is removed from the second adherend 20 even if the adhesive 1 is provided with high-density parts. Can be removed. When the angle of pulling the end side portion of the adhesive tape 30 is an angle of 75 ° or more with respect to the sticking surface, the adhesive body 1 of the present embodiment is more preferably used.

In the method for disassembling the adhesive body of the present embodiment, the speed at which the adhesive tape 30 is pulled is not particularly limited, but is preferably 10 m / min or less, more preferably 5 m / min or less, still more preferably 300 mm. It is less than / min. By pulling the adhesive tape 30 at such a speed, the adhesive tape 30 can be more reliably prevented from being torn.

Although the embodiment of the present invention has been described above with reference to the drawings, the adhesive body of the present invention, the method of assembling the adhesive body, and the method of disassembling the adhesive body are not limited to the above examples and are appropriate. You can make changes.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

<Measurement and evaluation method>
The measurement and evaluation of the adhesive tape obtained in each Example and Comparative Example were carried out based on the following method.

(1) Measurement of contact angle Using a fully automatic contact angle meter "DM-501HI type" manufactured by Kyowa Interface Science Co., Ltd., 23 ° C and 5
After instilling 2 μL of purified water on the surface of the release liner in 0% RH, the contact angle 1 second later was measured. The method for calculating the contact angle in this measurement follows the intravenous drop method among the test methods described in JIS R3257.

(2) Measurement of thickness of release portion The thickness of the release portion was measured using DIGI MICRO MFC-101 manufactured by NIKON. Specifically, the thickness of the first adherend at the release portion was measured, and then the thickness of the first adherend at the non-release portion was measured. The thickness of the release part was obtained by calculating the difference between them.

(3) Breaking elongation of the base material layer of the adhesive tape The breaking elongation of the adhesive tape is determined by punching the adhesive tape into a dumbbell shape with a marked line length of 20 mm and a width of 10 mm, and using a solvent such as ethyl acetate, alcohol, or toluene as an adhesive. Is swollen and scraped off with a spatula or the like to obtain only the base layer of the adhesive tape, and the solvent is further dried with a dryer. The measurement was performed by pulling in the length direction at a tensile speed of 300 mm / min using a testing machine.

(4) Breaking strength of the base layer of the adhesive tape The breaking strength of the base layer of the adhesive tape is determined by punching the adhesive tape into a dumbbell shape with a marked line length of 20 mm and a width of 10 mm, and using a solvent such as ethyl acetate, alcohol, or toluene. The adhesive is swollen and scraped off with a spatula or the like to obtain only the base layer of the adhesive tape, and then the solvent is dried with a dryer, and then the base layer is subjected to a measurement atmosphere of 23 ° C. and 50% RH. It was measured by pulling in the length direction at a tensile speed of 300 mm / min using a Tencilon tensile tester.

(5) Adhesive Strength of Adhesive Layer of Adhesive Tape With respect to the adhesive tape, one adhesive surface was backed with a polyester film (thickness 25 μm), and a tape sample was obtained with a size of 20 mm × 100 mm. A stainless steel plate was placed on the other adhesive surface of the tape sample, pressure-bonded once reciprocating using a 2 kg roller, and then left to stand for 1 hour under the conditions of 23 ° C. and 50% RH. Then, it was peeled off in the 180 ° direction at a peeling speed of 300 mm / min, and the adhesive force (N / 20 mm) at that time was measured.

(6) Thickness of Base Material Layer and Adhesive Layer of Adhesive Tape After immersing the adhesive tape in liquid nitrogen for 1 minute, fold and split the adhesive tape in liquid nitrogen using a tweezers with the width direction of the adhesive tape as a crease. A section for observing the fractured surface in the thickness direction of the adhesive tape was prepared. After returning the section to room temperature in a desiccator, the section was fixed on a sample table so that an electron beam was vertically incident on the fractured surface, and an electron microscope (Miniscope (registered trademark) TM3030Plus, manufactured by Hitachi High Technology Co., Ltd.) was used. Was used to observe the fractured surface. Based on the scale of the electron microscope, the thicknesses of the base material layer and the adhesive layer in the adhesive tape were measured at 10 points, and the arithmetic mean value thereof was taken as the thickness of each layer. The thickness of the base material layer and the pressure-sensitive adhesive layer is the length measured from the surface on one side of each layer to the surface on the other side along the stacking direction.

(7) Removability The first adherend obtained by the method described below is fixed to a stainless steel plate as the second adherend using an adhesive tape having a length of 120 mm and a width of 20 mm obtained by the method described below. After obtaining the adhesive, the ease of peeling off the adhesive tape was evaluated. Specifically, an adhesive tape having a length of 120 mm and a width of 20 mm was prepared, and the adhesive tape was attached to a stainless steel plate with the portion having a length of 20 mm on the tip side protruding from the handle portion. Next, the first adherend is placed on the adhesive tape so that the longitudinal direction of the adhesive tape is the longitudinal direction of the first adherend, and the first adherend is placed on the release portion of the first attachment surface of the first adherend. Adhesive corners were attached so as to be located at the boundary between the handle portion and the adhesive portion of the adhesive tape. Further, after one reciprocating crimping with a 5 kg load roller, the mixture is left at 23 ° C. for 1 hour or 85 ° C. for 500 hours, and then the handle portion is grasped and 90 ° to the first attachment surface of the first adherend. It was pulled out in the direction (direction perpendicular to the tape surface) at a speed of 300 mm / min. When the first adherend was fixed and left at 23 ° C. for 1 hour, and when it was fixed and left at 85 ° C. for 500 hours, 10 test pieces were evaluated to see if they could be peeled off without tearing. evaluated. Even when the peeled portion was not formed on the first sticking surface of the first adherend (Comparative Example 1), it was fixed to the stainless steel plate by the same method as in Example 1.
⊚: 10 out of 10 could be peeled off.
〇: 7 to 9 out of 10 could be peeled off.
Δ: 1 to 6 out of 10 could be peeled off.
X: None of the 10 pieces could be peeled off.

(8) Adhesiveness The first adherend having a weight of 40 g is fixed to a stainless steel plate as the second adherend by using an adhesive tape having a length of 120 mm and a width of 20 mm obtained by a method described later to form an adhesive. After obtaining the adhesive tape, the adhesiveness (strength of the bonding force of the adhesive body) of the adhesive tape was evaluated. Specifically, an adhesive tape having a length of 120 mm and a width of 20 mm is prepared, and a stainless steel plate (thickness 1.5 mm, thickness 1.5 mm,) is provided with the adhesive tape protruding from the tip side portion having a length of 10 mm as a handle portion. It was attached to a length of 150 mm, a width of 50 mm, and a weight of 85 g). After 1 hour, the test piece was freely dropped onto the concrete plate at 23 ° C. from a height of 1.5 m, and it was evaluated whether the first adherend was peeled off from the stainless steel plate.
The method of dropping was such that the flat surface of stainless steel fell on the concrete plate.
⊚: None of the 10 pieces were peeled off.
〇: 8 to 9 out of 10 did not come off.
X: 1 to 7 out of 10 were peeled off.

Subsequently, the materials and the like used in Examples and Comparative Examples are as follows.

[First adherend]
・ First adherend P-1:
The first adherend P-1 was obtained by the following method.
First, the packaging film of the first adherend P-1 was obtained by the following method. A coextruded film was produced by extruding a polyethylene terephthalate resin and nylon 6 by the T-die method, biaxially stretched in the MD and TD directions by a sequential stretching method, and then heat-treated at 200 ° C. to produce a resin film A. The stretching ratio was set to 3.4 times in the flow direction (MD) and 3.8 times in the width direction (TD). The laminated structure of the resin film A is polyethylene terephthalate (5 μm) / nylon 6 (20 μm).
Next, aroma to the glass transition temperature 0 ° C., a weight average molecular weight 20 × 10 ^3, trimethylolpropane (TMP) adducts of hydroxyl equivalents 1.2 pieces / mol of polyol compound and toluene diisocyanate (TDI) as the main component Using a urethane resin adhesive mixed with group isocyanate at a ratio of 1: 3, resin film A and aluminum foil 20 μm (8021 material, tensile breaking strength 100 MPa, tensile breaking elongation 10%, 0.2% proof stress 70 MPa) ) Was laminated. The thickness of the adhesive was 3 μm. The polyethylene terephthalate resin layer is located on the opposite side of the base material layer from the sealant layer.
Separately, the adhesive layer is formed by co-extruding an acid-modified polypropylene resin (unsaturated carboxylic acid graft-modified random polypropylene graft-modified with unsaturated carboxylic acid) constituting the adhesive layer and polypropylene (random copolymer) constituting the sealant layer. A two-layer co-extruded film composed of a sealant layer and a sealant layer was produced. Next, the two-layer coextruded film produced above is applied to the metal layer of the laminate composed of the base material layer (resin film A) / adhesive layer (urethane resin-based adhesive) / metal layer (aluminum foil) produced above. A laminate in which the base material layer / adhesive layer / metal layer / adhesive layer / sealant layer are laminated in this order by stacking the adhesive layers so that they are in contact with each other and heating the metal layer to 120 ° C. for thermal lamination. Got The obtained laminate was once cooled, then heated to 180 ° C., maintained at that temperature for 1 minute, and heat-treated to obtain a packaging film.
Next, a silicone release agent was applied to the surface of the packaging film having no release portion produced by the above method by a gravure printing method to form a release portion. The silicone release agent is 100 parts by mass of a silicone release agent (manufactured by Shin-Etsu Chemical Co., Ltd., product name "KS-847H") and a platinum catalyst (manufactured by Shin-Etsu Chemical Co., Ltd., product name "CAT-PL-50T". ”) A product consisting of 2.5 parts by mass was used. The thickness and contact angle of the release portion are as shown in Table 1.
Further, the obtained packaging film was cut into a predetermined shape, and aluminum parts were packaged. The shape of the aluminum part after packaging was a flat plate, a thickness of 2.5 mm, a length of 110 mm, a width of 49 mm, and a mass of 40 g. Further, the release portion was positioned along one of the pair of flat surfaces of the flat plate (first sticking surface) and along an angle extending in the width direction (width of 49 mm). Further, at this time, the length measured from the corner along the direction (length direction) orthogonal to the extending direction (width direction) of the corner was positioned so as to be a predetermined length shown in Table 1. The length measured along the extending direction (width direction) of the corner of the release portion was 49 mm.

・ First adherend P-2:
It was manufactured in the same manner as the first adherend P-1 except that the length of the release portion was changed.

・ First adherend P-3:
It was manufactured in the same manner as the first adherend P-1 except that the silicone release agent was changed to the polyethylene release agent. The thickness and contact angle of the release agent are as shown in Table 1. The polyethylene-based release agent is an ethylene propylene copolymer (“EP02P” manufactured by JSR Corporation, ethylene / propylene = 80/20 (molar ratio), weight average molecular weight 96700 (polystyrene equivalent), molecular weight distribution 2.24, MFR. = 3.2 g / 10 minutes) 2 g was dissolved in 100 g (toluene / methyl ethyl ketone = 80/20 (weight ratio)) of a mixed solvent of toluene and methyl ethyl ketone.

・ First adherend P-4:
It was manufactured in the same manner as the first adherend P-1 except that the length of the release portion was changed.

・ First adherend P-5:
It was manufactured in the same manner as the first adherend P-1 except that a release portion was not formed on the surface.

[Second adherend]
As the second adherend, a stainless steel plate having a thickness of 1.5 mm, a length of 150 mm, a width of 50 mm, and a weight of 85 g was used.

〔Adhesive tape〕
The pressure-sensitive adhesive layer and the base material layer prepared as described later were used in the combinations shown in Table 1 to prepare a rectangular pressure-sensitive adhesive tape as shown in FIG. Specifically, after peeling off the release liner of the base material layer, an adhesive layer formed on the release paper is attached to both sides of the base material layer, and the pressure is applied at 0.2 MPa to laminate the adhesive tape. Made. The thickness of the obtained adhesive tape is as shown in Table 1, the length is 120 mm, the width is 20 mm, and the length of the handle portion at the end of the adhesive tape (measured along the longitudinal direction of the adhesive tape). The length) is 20 mm.
The above evaluation was performed on the obtained adhesive tape, and the results are shown in Table 1.

(Base layer)
-Base layer S-1:
The resin composition of the base material layer 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 mass, and the ratio of the styrene-isoprene copolymer to the total amount of the resin composition (1) was 17% by mass. Next, toluene is added to the obtained resin composition, and the mixture is stirred so as to be uniform, and a release liner (film binar 75E-0010GT, Fujimori Kogyo Co., Ltd.) is used with an applicator so that the thickness after drying becomes 70 μm. The substrate layer S-1 was prepared by applying it on the above (the same applies hereinafter) and drying it at 60 ° C. for 10 minutes. The thickness of the obtained base layer is 70 μm, the elongation at break is 1200%, and the strength at break is 26 MPa.

-Base layer S-2:
As the resin composition of the base material layer, an ester polyurethane compound (Mobilon film MF100T, manufactured by Nisshinbo Textile Co., Ltd.) was used, and the thickness after drying was set to 100 μm. The base material layer S-2 was prepared in the same manner. The base material layer S-2 has a thickness of 100 μm, a breaking elongation of 720%, and a breaking strength of 33 MPa.

-Base layer S-3:
A polyethylene terephthalate film (Toray Industries, Inc., Lumirror S10 # 25) was used. The thickness is 25 μm, the elongation at break is 160%, and the strength at break is 230 MPa.

(Adhesive layer)
-Adhesive layer A-1:
The pressure-sensitive adhesive of the pressure-sensitive adhesive layer was produced as follows.
75.94 parts by mass of n-butyl acrylate, 5 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass 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 parts by mass of 4-hydroxybutyl acrylate and 200 parts by mass of ethyl acetate and raising the temperature to 75 ° C. while blowing nitrogen under stirring. Next, 4 parts by mass (solid content 2.5% by mass) of a 2,2'-azobisisobutyronitrile solution previously dissolved in ethyl acetate was added to the obtained mixture (1), and the mixture was stirred to 75 parts by mass. The mixture was held at ° C. for 8 hours to obtain the mixture (2). Next, the mixture (2) was diluted with 98 parts by mass of ethyl acetate and filtered through a 200-mesh wire mesh to obtain an acrylic copolymer solution (1) having a mass average molecular weight of 800,000 (polystyrene equivalent). Next, with respect to 100 parts by mass of the acrylic copolymer solution (1), 10 parts by mass of a polymerized rosin ester-based tackifier resin (D-125, Arakawa Chemical Industry Co., Ltd.) and a petroleum-based tackifier resin (FTR®). ) 6125, manufactured by Mitsui Chemicals, Inc.) 15 parts by mass was mixed and stirred, and then ethyl acetate was added to obtain a resin solution (1) of a pressure-sensitive adhesive having a solid content of 31% by mass. Next, with respect to 100 parts by mass of the adhesive resin solution (1), a cross-linking agent (Bernock D-40, manufactured by DIC Corporation; trimethylol propane adduct of tolylene diisocyanate, isocyanate group content 7% by mass, non-volatile content 40% by mass) 1.3 parts by mass was added, and the mixture was stirred and mixed so as to be uniform, and then filtered through a 100 mesh wire net to obtain an adhesive resin (1) having a solid content of 31.1% by mass.
Next, with respect to 100 parts by mass of the solid content of the obtained pressure-sensitive adhesive resin (1), filler 1 (aluminum hydroxide, BW153, manufactured by Nippon Light Metal Co., Ltd., volume average particle size: 18 μm, particle size distribution (D ₉₀ /) D ₁₀ ): 12.3) was added in an amount of 35 parts by volume to obtain a pressure-sensitive adhesive (1).
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.
Subsequently, the adhesive (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 50 μm with an applicator, and 3 at 80 ° C. The pressure-sensitive adhesive layer A-1 was prepared by drying for a minute.

-Adhesive layer A-2:
Resin composition (mixture of styrene-isoprene copolymer and styrene-isoprene-styrene copolymer, 24% by mass of structural unit derived from styrene represented by the chemical formula (2), styrene-isoprene with respect to the total amount of the resin composition Polymer ratio is 67% by mass) 100 parts by mass, Quinton G115 (C5 / C9 petroleum resin manufactured by Nippon Zeon Co., Ltd., softening point 115 ° C.) 40 parts by mass, Pencel D-160 (manufactured by Arakawa Chemical Industry Co., Ltd.) Polymerized rosin ester resin, softening point 150 ° C to 165 ° C) 30 parts by mass, Nisseki polybutene HV-50 (polybutene manufactured by JX Nikko Nisseki Energy Co., Ltd., flow point -12.5 ° C) 5 parts by mass and anti-aging Adhesive by mixing 1 part by mass of an agent (tetrakis- [methylene-3- (3'5'-di-t-butyl-4-hydroxyphenyl) propionate] methane) and dissolving it in 100 parts by mass of toluene as a solvent. Resin (2) was obtained.
Next, with respect to 100 parts by mass 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 /) D ₁₀ ): 12.3) was added in an amount of 35 parts by volume to obtain a pressure-sensitive adhesive (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.
Subsequently, the adhesive (2) 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 50 μm with an applicator, and 3 at 80 ° C. The pressure-sensitive adhesive layer A-2 was prepared by drying for a minute.

-Adhesive layer A-3:
A pressure-sensitive adhesive (3) was obtained in the same manner as the pressure-sensitive adhesive (1) except that the above-mentioned pressure-sensitive adhesive (1) did not contain filler particles, and the pressure-sensitive adhesive layer A- was carried out in the same manner as the pressure-sensitive adhesive layer A-1. 3 was prepared.

Subsequently, Examples and Comparative Examples will be described.

[Examples 1 to 7, Comparative Examples 1 and 2]
The first adherend, the second adherend, and the adhesive tape prepared as described above were used in the combinations shown in Table 1 to prepare an adhesive as shown in FIG. Specifically, an adhesive tape was attached to the first attachment surface of the first adherend. At this time, the adhesive tape was attached so as to be located on the release portion. Further, in the adhesive tape, the portion (handle portion) on the end side of the portion to be attached to the release portion is located outside the first attachment surface. Next, the first adherend is placed on the first. 2 The adhesive body was assembled by sticking to the adherend. In Comparative Example 1, the first adherend did not have a release portion, but the adhesive body was assembled in the same manner as in Example 1. Further, the contact angle of Comparative Example 1 was measured at the same position as the measurement position of the contact angle of the release portion measured in Example 1 and the like.
The above evaluation was performed on the obtained adhesive, and the results are shown in Table 1.

As shown in Table 1, the first adherend has a predetermined release portion, and the adhesive tape has a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa. The adhesives of Examples 1 to 7 having adhesive layers on both sides of the base material layer reduce the load on the adhesive tape and tear off even when the adhesive tape is peeled off at an angle to the sticking surface. Was able to be prevented. Further, as can be seen by comparing Examples 1 and 4, it can be seen that the pressure-sensitive adhesive in the pressure-sensitive adhesive layer contains a filler, which makes it easier to peel off the pressure-sensitive adhesive tape.
On the other hand, as shown in Table 1, the adhesive body of Comparative Example 1 in which the first adherend does not have a release portion is used when the adhesive tape starts to stretch when the adhesive tape is peeled off at an angle to the sticking surface. The load was heavy and the adhesive tape was torn. Further, in the adhesive body of Comparative Example 2 in which the breaking elongation and breaking strength of the base material layer of the adhesive tape are out of the predetermined ranges, the adhesive tape does not stretch when the adhesive tape is peeled off at an angle with respect to the sticking surface. , Could not be peeled off.

According to the present invention, even when the adhesive tape is peeled off at an angle to the sticking surface, the load on the adhesive tape can be reduced and tearing can be prevented. It is possible to provide a method of assembling a body and a method of disassembling the adhesive for removing parts and the like in the adhesive.

1: Adhesive body 10: First adherend 11: Release portion 12: First sticking surface 13: Square 20: Second adherend 21: Second sticking surface 30: Adhesive tape 31: Base material layer 32: Adhesive Agent layer 33: Film 40: Parts 41: Housing 42: Adhesive tape 43: Square

Claims (7)

An adhesive body comprising an adhesive tape, a first adherend attached on one surface of the adhesive tape, and a second adherend attached on the other surface of the adhesive tape. ,
The first adherend has a contact angle of 80 to 80 to a portion of the first attachment surface of the first adherend to which the adhesive tape is attached, which is adjacent to a corner defining the first attachment surface. It has a mold release portion that is 180 ° and has a thickness of 10 μm or less.
The release portion is formed by printing or coating directly on the surface of the first adherend.
The adhesive tape is attached on the release portion, and the portion of the adhesive tape on the end side of the portion attached to the release portion is located outside the first attachment surface. ,
The adhesive tape includes a base material layer having a breaking elongation of 200 to 3000% and a breaking strength of 1.5 to 80 MPa, and adhesive layers on both sides of the base material layer .
The pressure-sensitive adhesive layer is an adhesive body containing filler particles. Particle size distribution of the filler particles (D ₉₀ / D ₁₀ The adhesive according to claim 1, wherein) is 2.5 to 20. The adhesive according to claim 1 or 2 , wherein the release portion has a length of 0.5 to 30 mm measured from the angle adjacent to the release portion along a direction orthogonal to the angle. The adhesive according to any one of claims 1 to 3, wherein the release portion has a length of 0.5 mm or more measured along the corner adjacent to the release portion. Claims 1 to 4 include the mold release portion containing one or more resins selected from the group consisting of silicone resins, fluororesins, rubber-based resins, polyolefin-based resins, alkylated melamine formaldehyde resins, and long-chain alkyl compounds. The adhesive according to any of the above. The method for assembling an adhesive according to any one of claims 1 to 5.
A method for assembling an adhesive body, which comprises a step of adhering the first adherend and the adhesive tape so that the adhesive tape is located on the release portion. The method for disassembling an adhesive according to any one of claims 1 to 5.
A method for disassembling an adhesive body, which comprises a step of pulling a portion of the adhesive tape on the end side of the portion to be attached to the release portion at an angle of 60 ° or more with respect to the attachment surface. ..

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