Pressure-sensitive adhesive article

Abstract

To provide a pressure-sensitive adhesive article with enhanced pressure-sensitive adhesive strength.SOLUTION: A pressure-sensitive adhesive article 10 comprises a core material 11 and a pressure-sensitive adhesive layer 12 that covers the longitudinal surface of the core material 11, wherein the core material 11 is a multifilament yarn comprising four or more filaments 13.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an adhesive article. [Background technology]

[0002] Adhesive articles having a thread-like core material are known. For example, Patent Document 1 discloses a thread-like adhesive device having an adhesive attached to a thread-like core material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-231980 Summary of the Invention [Problem to be solved by the invention]

[0004] Such adhesive articles have the advantage that, because they are thread-like, they can be easily applied to complex shapes such as curves, curved surfaces, and uneven surfaces, and can also be applied to narrow areas. Moreover, unlike liquid adhesives, there is no risk of dripping or spilling out.

[0005] Generally, such thread-like adhesive articles have a smaller contact area with the adherend compared to double-sided adhesive tapes, and therefore have a lower adhesive strength, and therefore are often used in applications that do not require high adhesive strength, such as temporary fastening and adhesion of relatively lightweight members. Cited Document 1 also discloses that thread-like adhesives are used for adhering relatively lightweight posters, temporary fastening of parts and materials, adhesion of office supplies, and the like. Therefore, there has been insufficient research aimed at improving the adhesive strength of thread-like adhesive articles.

[0006] In view of the above, an object of the present invention is to provide an adhesive article that is thread-like and has excellent adhesive strength. [Means for solving the problem]

[0007] As a result of extensive research, the inventors discovered that the above-mentioned problems can be solved in an adhesive article having a thread-like core material by using a core material that is easily deformed in the thickness direction (direction perpendicular to the longitudinal direction), and thus completed the present invention. That is, the adhesive article of the present invention comprises a core material and an adhesive layer covering the surface of the core material in the longitudinal direction, and the core material is a multifilament yarn having four or more filaments.

[0008] In one embodiment of the adhesive article of the present invention, the twist factor of the core material represented by formula (A) described in the specification may be 0 or more and 200 or less.

[0009] In one embodiment of the pressure-sensitive adhesive article of the present invention, the number of twists of the core material may be 0 to 250 twists / m.

[0010] In one embodiment of the adhesive article of the present invention, the filaments may be hollow fibers.

[0011] In one embodiment of the adhesive article of the present invention, the filaments may be chemical fibers. Effect of the Invention

[0012] The adhesive article of the present invention is thread-like and has excellent adhesive strength, and therefore is applicable to a wide range of uses. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view of an adhesive article according to a first embodiment of the present invention, taken along a cross section perpendicular to the longitudinal direction. [Diagram 2] Figure 2(a) is a schematic diagram of adherends bonded together using an adhesive article having a core material consisting of a single thread (monofilament), and Figures 2(b) and (c) are schematic diagrams of adherends bonded together using an adhesive article according to the first embodiment of the present invention. [Diagram 3]FIG. 3(a) is a perspective view for explaining a method for evaluating the adhesive strength of an adhesive article of the present invention, and FIG. 3(b) is a cross-sectional view taken along line AA in FIG. 3(a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail. Note that the present invention is not limited to the embodiment described below. In addition, in the following drawings, components and parts having the same function may be described with the same reference numerals, and duplicated descriptions may be omitted or simplified. In addition, the embodiments shown in the drawings are schematic in order to clearly explain the present invention, and do not necessarily accurately represent the size or scale of the actual product.

[0015] 1 is a cross-sectional view of an adhesive article 10 according to one embodiment of the present invention in a cross section perpendicular to the longitudinal direction. The adhesive article 10 according to this embodiment is an adhesive article 10 comprising a core material 11 and an adhesive layer 12 that covers the surface of the core material 11 in the longitudinal direction, and the core material 11 is a multifilament yarn comprising four or more filaments 13. The adhesive article of the present embodiment has excellent adhesive strength due to the above-described configuration, which will be described in detail below.

[0016] The adhesive strength (how difficult it is to peel off the adherends) when the adherends are bonded together using an adhesive article is largely dependent on the contact area between the adhesive article and the adherends. Fig. 2(a) shows a schematic diagram of the state in which the adherends 1 are bonded together using an adhesive article 30 having a core material made of a single thread (monofilament). Since the core material of such an adhesive article hardly deforms, the contact area with the adherend is small, and therefore it is difficult to exert a high adhesive strength.

[0017] However, when the adhesive article 10 of the present embodiment is used to bond adherends 1 together, the filaments 13 constituting the core material 11 spread apart, causing the core material 11 to deform and be crushed, as shown in Fig. 2(b). As a result, the adhesive article 10 of the present embodiment can come into contact with the adherend over a wider area than an adhesive article having a core material made of a single thread (monofilament). Furthermore, since the core material 11 in this embodiment includes four or more filaments 13, it has a large surface area, and therefore the amount of adhesive attached per unit length can be increased.

[0018] For the reasons described above, the adhesive article 10 of the present embodiment exhibits higher adhesive strength than an adhesive article having a core material of approximately the same thickness (fineness) and made of a monofilament.

[0019] In order to obtain the above-mentioned effects, the core material 11 in this embodiment is a multifilament yarn having four or more filaments 13. In addition, in order to further improve the adhesive strength, the number of filaments 13 constituting the core material 11 in this embodiment is preferably 10 or more, more preferably 15 or more, and even more preferably 20 or more. On the other hand, if the thickness (fineness) of the core material 11 is kept at the same level, as the number of filaments 13 constituting the core material 11 increases, each filament becomes thinner (fineness becomes smaller). If each filament becomes too thin, this may lead to a decrease in the strength and handling properties of the core material 11, so the number of filaments constituting the core material 11 is preferably 300 or less.

[0020] In addition, the core material 11 in this embodiment may be a twisted yarn that has been twisted, or may be an untwisted yarn that has not been twisted. That is, the core material 11 in this embodiment may have a twist count of more than 0 times / m or 0 times / m. In addition, the core material 11 in this embodiment may be a bundle of multiple multifilaments that are twisted yarns or untwisted yarns, twisted or untwisted.

[0021] When a force is applied in a direction in which the adherends 1 bonded together using the adhesive article 10 of this embodiment are peeled off, as shown in FIG. 2(c), the filaments 13 spread out and the core material 11 is deformed so as to extend in the thickness direction (direction perpendicular to the longitudinal direction) in a direction parallel to the applied force. However, if the shape of the core material 11 becomes too distorted at this time, stress is concentrated in the distorted part, and this part is likely to become the starting point of peeling. Therefore, in order to achieve even better adhesive strength, it is preferable that the filaments 13 constituting the core material 11 have a certain degree of cohesion. As described above, the core material 11 in this embodiment may be a non-twisted yarn or a twisted yarn, that is, the number of twists of the core material 11 in this embodiment may be 0 times / m or more, but in order to give a certain degree of cohesion to the filaments 13 constituting the core material 11, it is preferable that the core material 11 in this embodiment is twisted. Specifically, the number of twists of the core material 11 in this embodiment is preferably 30 turns / m or more, more preferably 60 turns / m or more, and even more preferably 90 turns / m or more. On the other hand, in order for the core material 11 to deform sufficiently when the adherends 1 are bonded together, and in order to increase the amount of adhesive attached per unit length, it is preferable that the twist of the core material 11 is not too strong. Therefore, the number of twists of the core material 11 is preferably 3000 times / m or less, more preferably 1500 times / m or less, even more preferably 800 times / m or less, and particularly preferably 250 times / m or less.

[0022] Furthermore, when the core material 11 is twisted, it is preferable to also control the twist factor represented by the following formula (A) from the same viewpoint as above. The twist factor is an index for discussing the influence of twisting (influence on the core material's cohesion, ease of deformation, amount of adhesive applied, etc.) regardless of the thickness of the core material. In other words, the influence of the number of twists on the core material differs depending on the thickness of the core material, but if the twist factor is the same, it indicates that the influence of twisting on the core material is the same regardless of the thickness of the core material. In this embodiment, the twist factor of the core material is preferably 0 or more, and more preferably more than 0. On the other hand, if the twist factor is 200 or less, the flexibility of the core material and thus the adhesive article is improved, and it becomes easier to apply the core material to complex shapes and narrow areas such as curved parts, bent parts, and uneven parts. Therefore, the twist factor of the core material is preferably 200 or less, more preferably 170 or less, more preferably 100 or less, more preferably 80 or less, and even more preferably less than 50.

[0023]

number

[0024] In the formula (A), K is the twist coefficient, T is the number of twists (unit: [turns / m]), and D is the fineness (unit: [dtex]).

[0025] The material of the filaments 13 forming the core material 11 in this embodiment is not particularly limited, and may be a chemical fiber or a natural fiber. Examples of chemical fibers include various polymer materials such as rayon, cupra, acetate, promix, nylon, aramid, vinylon, vinylidene, polyvinyl chloride, polyester, acrylic, polyethylene, polypropylene, polyurethane, polychlar, and polylactic acid, glass, carbon fiber, synthetic rubber such as polyurethane, and metal. Examples of natural fibers include silk and natural rubber.

[0026] From the viewpoint of adhesive strength, the filaments 13 forming the core material 11 in this embodiment are preferably chemical fibers. Chemical fibers are less likely to fluff and become irregular in shape. Therefore, when the filaments forming the core material in this embodiment are chemical fibers, they are less likely to cause peeling and exhibit excellent adhesive strength. Among the chemical fibers, polyester or nylon is particularly preferred.

[0027] The filaments 13 forming the core material 11 in this embodiment may be hollow fibers. Generally, hollow fibers are flexible in the thickness direction and easily deformed, so that the core material obtained by using hollow fibers is also flexible in the thickness direction and easily deformed. Therefore, when hollow yarns are used as filaments forming the core material, the above-mentioned deformation such as crushing of the core material is more likely to occur. In addition, when the core material has high flexibility, when a force is applied in a direction in which the adherends bonded together using the adhesive article are pulled apart, the stress caused by the deformation of the core material is more likely to be dispersed, so that the interface (adhesive surface) between the adhesive article and the adherend is less likely to be stressed and peeling is less likely to occur. From the above-mentioned points, when hollow yarns are used as filaments forming the core material, an adhesive article with particularly excellent adhesive strength can be obtained. In addition, since hollow fibers are generally brittle, when hollow fibers are used as filaments forming the core material, it is preferable to use them without twisting them.

[0028] The thickness (fineness) of the core material 11 in this embodiment is not particularly limited and may be adjusted appropriately depending on the application of the adhesive article and the type of adherend, and is, for example, about 20 to 2000 dtex.

[0029] If necessary, various additives such as fillers (inorganic fillers, organic fillers, etc.), antiaging agents, antioxidants, UV absorbers, antistatic agents, lubricants, plasticizers, colorants (pigments, dyes, etc.) may be blended into the core material 11. The surface of the core material may be subjected to a known or conventional surface treatment such as a corona discharge treatment, a plasma treatment, or application of a primer.

[0030] The adhesive layer 12 in this embodiment is formed by an adhesive. The adhesive forming the adhesive layer 12 is not particularly limited, and a known adhesive can be used. For example, an acrylic adhesive, a rubber adhesive, a vinyl alkyl ether adhesive, a silicone adhesive, a polyester adhesive, a polyamide adhesive, a urethane adhesive, a fluorine adhesive, an epoxy adhesive, and the like can be mentioned. Among them, from the viewpoint of adhesion, a rubber adhesive or an acrylic adhesive is preferable, and an acrylic adhesive is particularly preferable. Note that only one type of adhesive may be used alone, or two or more types may be used in combination. In addition, the adhesive in this embodiment is preferably a pressure-sensitive adhesive that has adhesion at room temperature and can attach an adherend to its surface by the pressure generated when the surface of the adhesive and the surface of the adherend come into contact with each other. If it is a pressure-sensitive adhesive, it does not require heating and can be applied to adherends that are weak against heat.

[0031] Acrylic adhesives are mainly composed of polymers of monomers consisting of alkyl (meth)acrylate esters such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, and isononyl acrylate, to which modifying monomers such as acrylonitrile, vinyl acetate, styrene, methyl methacrylate, acrylic acid, maleic anhydride, vinylpyrrolidone, glycidyl methacrylate, dimethylaminoethyl methacrylate, hydroxyethyl acrylate, and acrylamide are added as necessary.

[0032] Rubber-based adhesives are based on rubber polymers such as natural rubber, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutylene, butyl rubber, chloroprene rubber, and silicone rubber.

[0033] In addition, these adhesives may be appropriately blended with various additives such as tackifying resins such as rosin-based, terpene-based, styrene-based, aliphatic petroleum-based, aromatic petroleum-based, xylene-based, phenol-based, coumarone-indene-based, and hydrogenated versions of these, as well as crosslinking agents, viscosity modifiers (thickeners, etc.), leveling agents, release regulators, plasticizers, softeners, fillers, colorants (pigments, dyes, etc.), surfactants, antistatic agents, preservatives, antioxidants, UV absorbers, antioxidants, and light stabilizers.

[0034] The adhesive may be either a solvent-based adhesive or a water-dispersed adhesive. A water-dispersed adhesive is preferred because it can be applied at high speed, is environmentally friendly, and has little effect (swelling, dissolution) on the core material 11 due to the solvent.

[0035] In order to further improve the adhesive strength of the adhesive article 10 of this embodiment, it is preferable that a large amount of adhesive is attached to the core material, and specifically, the amount of adhesive attached (weight of the adhesive layer per unit length) in the adhesive article of this embodiment is preferably 5 mg / m or more, more preferably 8 mg / m or more, and even more preferably 16 mg / m or more. On the other hand, if the amount of adhesive attached is excessive, the adhesive needs to be applied to the core material multiple times in the manufacturing process, and the applied adhesive takes time to dry, resulting in low manufacturing efficiency. Therefore, the amount of adhesive attached in the adhesive article of this embodiment is preferably 200 mg / m or less, more preferably 180 mg / m or less, and even more preferably 160 mg / m or less.

[0036] In the adhesive article 10 of this embodiment, the adhesive layer 12 may cover the entire surface (surface in the longitudinal direction) of the core material 11, or may cover only a part of the surface of the core material 11. The adhesive layer 12 is typically formed continuously, but is not limited to such a form, and may be formed in a regular or random pattern such as a dotted or striped pattern. The end surface of the core material may or may not be covered by the adhesive layer 12. For example, when the adhesive article 10 is cut during the manufacturing process or during use, the end surface of the core material 11 may not be covered by the adhesive layer 12.

[0037] An example of a method for producing the adhesive article 10 of this embodiment will be described below. Note that the method for producing the adhesive article 10 of this embodiment is not limited to the method described below. The adhesive article 10 of this embodiment can be obtained by applying an adhesive to the surface of the core material 11 by dipping, immersion, coating, or the like, and then heating and drying. The adhesive can be applied using a conventional coater such as a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, or spray coater. The drying temperature and time are not particularly limited and may be set appropriately, but the drying temperature is preferably 40°C to 200°C, more preferably 50°C to 180°C, and particularly preferably 70°C to 120°C. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.

[0038] The adhesive article 10 of the present embodiment can be attached to narrow members or narrow areas while preventing overflow, can be easily applied to complex shapes such as curves, curved surfaces, and uneven surfaces, and is also preferable in that it can be easily disassembled (reworked). Furthermore, since it has excellent adhesive strength, it can be used to adhere various items. For example, the adhesive article 10 of the present embodiment can be suitably used for fastening articles in the manufacture of electronic devices, and can be applied to fastening narrow frame sections of mobile terminals such as mobile phones and smartphones.

[0039] In addition, for example, when an adhesive tape is applied to an adherend having a complex shape such as a curve, a curved surface, or an uneven surface, wrinkles or overlaps may occur in the adhesive tape at such a portion, making it difficult to prevent the tape from overflowing and to apply the tape neatly. Furthermore, the wrinkled or overlapped portion may cause a decrease in adhesive strength. In addition, in order to apply the adhesive tape without causing wrinkles or overlaps, it is possible to apply the tape while cutting it into small pieces, but this would significantly deteriorate the workability. On the other hand, the adhesive article 10 of the present embodiment can be firmly applied without causing wrinkles or overlaps even when applied to a portion having a complex shape such as a curve, a curved surface, or an uneven surface. Furthermore, since the adhesive article 10 can be applied to the desired portion at once, i.e., in one process, it is excellent in workability and can be applied to an automated line. Specifically, the adhesive article 10 of the present embodiment can be suitably used for fixing cables such as electric wires and optical fibers, LED fiber lights, optical fiber sensors such as FBG (Fiber Bragg Gratings), various wires (linear members) such as threads, strings, and wires, and thin members in a desired shape. Even when a wire or thin member is fixed to another member in a complex shape, the adhesive article 10 of the present embodiment can firmly fix the wire or thin member with excellent workability while suppressing protrusion, wrinkles, and overlaps according to the complex shape that the wire or thin member should have. In addition, when fixing a wire or thin member to another member, the adhesive article 10 of the present embodiment can be attached in advance to the surface of the other member according to the shape of the wire or thin member to be fixed, and then the wire or thin member can be attached to the adhesive article attached to the surface of the other member to fix it. Alternatively, the adhesive article of the present embodiment may be attached to a wire or a narrow member, and then the wire or narrow member may be fixed to another member in a desired configuration.

[0040] The adhesive article 10 of the present embodiment can also be suitably used for the purpose of temporarily fixing (temporarily fastening) an article, for example, to the surface of another article. More specifically, the adhesive article of the present embodiment can be used for the purpose of temporarily fixing (temporarily fastening) an article when manufacturing textile products such as clothes, shoes, bags, and hats, leather products, and the like. However, the purpose is not limited thereto, and the adhesive article can be suitably used for various purposes where temporary fixing (temporarily fastening) is desired. For example, when one article is fixed to the surface of another article, the first article is provisionally fixed to the surface of the other article using a thread-like adhesive article in advance to position the first article, and then the two articles are fixed (mainly fixed) by a fixing method such as thermocompression bonding or sewing. In this case, if the adhesive article of this embodiment is used, it is easy to provisionally fix the two articles while avoiding the fixing part provided between the two articles. For example, when sewing textile products or leather products, if provisionally fixing is performed using a thread-like adhesive article, it is easy to provisionally fix the two articles while avoiding the sewing part, and it is easy to prevent the adhesive from adhering to the needle. Furthermore, as described above, the adhesive article of this embodiment can be satisfactorily attached to both articles while minimizing overflow, wrinkles, and overlap, even if the articles have complex shapes such as curves, curved surfaces, or uneven surfaces, and can be attached in a single process, providing good workability. Furthermore, even in the case of materials that are easily deformed, such as fabric, cloth, leather, etc. that make up textile products or leather products, by temporarily fixing them using the adhesive article of this embodiment, deformation of the materials due to tension can be suppressed or prevented, resulting in good design after fixing (full fixation). Furthermore, with the adhesive article of the present embodiment, after the two articles are fixed (mainly fixed), the adhesive article of the present embodiment can be easily removed from between the two fixed (mainly fixed) articles as necessary. In this way, the adhesive can be prevented from protruding, and the deterioration of the design caused by the discoloration of the remaining adhesive over time can be effectively prevented.

[0041] Furthermore, the adhesive article 10 of this embodiment can be twisted together with threads made of other materials to create a combined thread, or woven with threads or cloth (including nonwoven fabrics and sheets) made of other materials to combine functions. EXAMPLES

[0042] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples in any way.

[0043] [Creating adhesive articles] Example 1 (Preparation of Water-Dispersible Acrylic Pressure-Sensitive Adhesive for Forming Pressure-Sensitive Adhesive Layer) 40 parts by weight of ion-exchanged water was placed in a reaction vessel equipped with a cooling tube, nitrogen inlet tube, thermometer, and stirrer, and nitrogen substitution was performed by stirring at 60°C for 1 hour or more while introducing nitrogen gas. 0.1 parts by weight of 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine]n hydrate (polymerization initiator) was added to this reaction vessel. While maintaining the system at 60°C, monomer emulsion A was gradually added dropwise over 4 hours to allow the emulsion polymerization reaction to proceed. As the monomer emulsion A, 98 parts by weight of 2-ethylhexyl acrylate, 1.25 parts by weight of acrylic acid, 0.75 parts by weight of methacrylic acid, 0.05 parts by weight of lauryl mercaptan (chain transfer agent), 0.02 parts by weight of γ-methacryloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KBM-503"), and 2 parts by weight of sodium polyoxyethylene lauryl sulfate (emulsifier) ​​were added to 30 parts by weight of ion-exchanged water and emulsified. After the dropwise addition of the monomer emulsion A was completed, the system was kept at 60°C for another 3 hours, cooled to room temperature, and then the pH was adjusted to 7 by adding 10% ammonia water to obtain an acrylic polymer emulsion (water-dispersed acrylic polymer) A. 20 parts by weight of a tackifier resin emulsion (manufactured by Arakawa Chemical Industries, Ltd., product name "E-865NT") was added based on the solid content per 100 parts by weight of the acrylic polymer contained in the acrylic polymer emulsion A. Furthermore, the pH was adjusted to 7.2 and the viscosity to 10 Pa·s using 10% by weight ammonia water as a pH adjuster and polyacrylic acid (manufactured by Toagosei Co., Ltd., product name "Aron B-500") as a thickener. In this way, a water-dispersible acrylic adhesive A for the adhesive layer was obtained.

[0044] (Preparation of adhesive articles) A multifilament yarn (267 dtex) formed by bundling 12 polyester yarns (filaments) without twisting was used as the core material. The water-dispersible acrylic pressure-sensitive adhesive A was applied to the core material by dipping so that the adhesion amount of the pressure-sensitive adhesive in the resulting pressure-sensitive adhesive article was 65 mg / m, and the core material was then dried at 80°C for 5 minutes to form a pressure-sensitive adhesive layer, thereby obtaining the pressure-sensitive adhesive article of Example 1.

[0045] <Example 2> An adhesive article of Example 2 was obtained in the same manner as in Example 1, except that a multifilament yarn (280 dtex) formed by bundling 48 polyester yarns (filaments) without twisting was used as the core material.

[0046] <Example 3> An adhesive article of Example 3 was obtained in the same manner as in Example 1, except that a multifilament yarn (250 dtex) formed by bundling 72 polyester yarns (filaments) without twisting was used as the core material.

[0047] <Example 4> An adhesive article of Example 4 was obtained in the same manner as in Example 1, except that a multifilament yarn (280 dtex) made of 48 polyester yarns (filaments) twisted at 50 turns / m was used as the core material.

[0048] <Example 5> An adhesive article of Example 5 was obtained in the same manner as in Example 4, except that the twist number was 150 turns / m.

[0049] <Example 6> An adhesive article of Example 6 was obtained in the same manner as in Example 4, except that the twist number was 300 times / m.

[0050] <Example 7> An adhesive article of Example 7 was obtained in the same manner as in Example 4, except that the twist number was 1000 times / m.

[0051] <Example 8> An adhesive article of Example 8 was obtained in the same manner as in Example 1, except that a multifilament yarn (110 dtex) formed by bundling 24 hollow fibers without twisting was used as the core material.

[0052] <Example 9> An adhesive article of Example 9 was obtained in the same manner as in Example 1, except that the two core materials used in Example 2 were bundled together and used as the core material without being twisted.

[0053] <Example 10> An adhesive article of Example 10 was obtained in the same manner as in Example 1, except that two of the core materials used in Example 2 were twisted at 150 times / m and used together as a core material.

[0054] <Example 11> An adhesive article of Example 11 was obtained in the same manner as in Example 1, except that the three core materials used in Example 2 were bundled together and used as the core material without being twisted.

[0055] <Example 12> An adhesive article of Example 12 was obtained in the same manner as in Example 1, except that three of the core materials used in Example 2 were twisted at 150 times / m and used together as a core material.

[0056] <Example 13> An adhesive article of Example 13 was obtained in the same manner as in Example 1, except that a multifilament yarn (260 dtex) formed by bundling four polyester yarns (filaments) without twisting them was used as the core material.

[0057] <Example 14> An adhesive article of Example 14 was obtained in the same manner as in Example 1, except that the twist number was 120 turns / m.

[0058] <Example 15> An adhesive article of Example 15 was obtained in the same manner as in Example 4, except that the twist number was 5 turns / m.

[0059] <Comparative Example 1> An adhesive article of Comparative Example 1 was obtained in the same manner as in Example 1, except that one 280 dtex polyester yarn (filament) was used as the core material.

[0060] <Comparative Example 2> An adhesive article of Comparative Example 2 was obtained in the same manner as in Example 1, except that a multifilament yarn (315 dtex) formed by bundling three polyester yarns (filaments) without twisting them was used as the core material.

[0061] [Evaluation of adhesive articles] The adhesive strength of each of the obtained adhesive articles was evaluated by the following method. <Adhesive strength evaluation> Using the adhesive article of each example, a circular acrylic plate 42 having a thickness of 3 mm and a diameter of 70 mm was bonded to a rectangular polycarbonate resin plate 41 (short side 80 mm, long side 110 mm, thickness 10 mm) having a rectangular slit (short side 30 mm, long side 40 mm) in the center, so that the center of the acrylic plate 42 and the center of the slit of the polycarbonate resin plate 41 were aligned, and the plates were pressed together at 2 kg for 10 seconds. The adhesive article was placed along the edge of the acrylic plate as shown in Figures 3(a) and (b). A perspective view of the bonded state is shown in Figure 3(a), and a cross-sectional view of the AA line in Figure 3(a) is shown in Figure 3(b). Next, the polycarbonate resin plate 41 was fixed, and a load was applied through the slit to the center of the acrylic plate 42 in a direction in which the acrylic plate 42 and the polycarbonate resin plate 41 were separated, as shown in Fig. 3(b), and the maximum load observed until the acrylic plate 42 and the polycarbonate resin plate 41 were separated was measured. The measurement results are shown in Table 1.

[0062] [Flexibility evaluation] The flexibility of the adhesive bodies of the Examples and Comparative Examples was evaluated by the following test. An adhesive body having excellent flexibility is preferred because it is easy to cause deformation such as crushing of the core material, has excellent adhesive strength, and can be easily deformed to fit a complicated shape of an adherend surface such as a curve, a curved surface, or an uneven surface. First, a ring with a diameter of 5 cm was formed using each adhesive material. Next, the obtained ring was deformed by pressing from the outside to the inside with a finger, and the flexibility was evaluated on a three-point scale based on the feel at that time. ○ (Flexible): The object could be deformed with almost no resistance. △ (slightly flexible): Some resistance was felt when deforming. × (Hard): A large resistance was felt when deforming.

[0063] [Table 1]

[0064] The adhesive articles of Comparative Examples 1 and 2 had a small number of filaments constituting the core material, and were inferior in adhesive strength. On the other hand, the adhesive articles of Examples 1 to 15, in which the core material had four or more filaments, exhibited excellent adhesive strength.

[0065] [Preparation of adhesive articles] <Examples 16 to 19> The adhesive articles of Examples 16 to 19 were obtained in the same manner as Example 1, except that six polyester yarns (filaments) were bundled together without twisting in Example 16, and that multifilament yarn (44 dtex) bundled together by twisting it by the number of times shown in Table 2 was used as the core material in Examples 17 to 19, and that the amount of adhesive applied was changed as shown in Table 2.

[0066] <Examples 20 to 25> The adhesive articles of Examples 20 to 25 were obtained in the same manner as Example 1, except that the five core materials used in Example 5 were used, and that for Example 20, the core material was a multifilament yarn (2240 ​​dtex) that was bundled together without twisting, and for Examples 21 to 25, the core material was a multifilament yarn (2240 ​​dtex) that was bundled together by twisting it by the number of times shown in Table 2, and that the amount of adhesive applied was changed as shown in Table 2.

[0067] [Evaluation of adhesive articles] The adhesive strength of the adhesive articles of Examples 16 to 25 was evaluated in the same manner as described above. The results are shown in Table 2 together with the results of Examples 2, 4 to 7, and 15.

[0068] [Table 2]

[0069] Examples 4, 5, 15, 17, 18, and 21 to 23 had particularly excellent adhesive strength compared to other examples of the same fineness, which is believed to be due to the particularly favorable twist factor of the core material. [Explanation of symbols]

[0070] 1 Adherent 10, 30, 40 Adhesive articles 11 Core material 12 Adhesive layer 13 Filament 41 Polycarbonate resin plate 42 Acrylic board

Claims

1. It comprises a core material and an adhesive layer covering the longitudinal surface of the core material, The core material is a multifilament yarn having 20 or more filaments, The number of twists of the core material is 90 times / m or more, The configuration has such that the filaments become thinner as the number of filaments increases. Adhesive articles.

2. A core material comprising an adhesive layer covering the longitudinal surface of the core material, The core material is a multifilament yarn having four or more filaments, The number of twists of the core material is 30 times / m or more, The core material is made of a material that is less prone to fraying and less likely to become irregularly shaped. Adhesive articles.

3. The adhesive article according to claim 1 or 2, wherein the twist coefficient K of the core material represented by formula (A) is 0 or more and 200 or less. [Math 1] (In equation (A), K is the twist coefficient, T is the number of twists (unit: [twists / m]), and D is the fineness (unit: [dtex]).)

4. The adhesive article according to claim 1, wherein the number of twists of the core material is 90 to 250 times / m.

5. The adhesive article according to claim 2, wherein the number of twists of the core material is 30 to 250 times / m.

6. The adhesive article according to any one of claims 1 to 5, wherein the filament is a hollow fiber.

7. The adhesive article according to any one of claims 1 to 6, wherein the filament is a chemical fiber.

8. The adhesive article according to claim 7, wherein the chemical fiber is at least one selected from polymer materials, glass, carbon fiber, synthetic rubber, and metal.

9. The adhesive article according to any one of claims 1 to 8, wherein the amount of adhesive adhering to the core material is 5 mg / m or more and 200 mg / m or less.

10. The adhesive article according to any one of claims 1 to 9, wherein the fineness of the core material is 20 to 2000 dtex.

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