Adhesive article

Abstract

The present application relates to an adhesive article having a core material and an adhesive layer covering the lengthwise surface of the core material, the core material being a multifilament having four or more filaments, the core material having a twist number of 0 to 250 turns / m.

Description

[0001] This application is a divisional application of Chinese Invention Patent Application No. 201980065554.0 (PCT application number PCT / JP2019 / 039199), filed on October 3, 2019, entitled "Adhesive Article". Technical Field

[0002] This invention relates to adhesive articles. Background Technology

[0003] Previously, adhesive articles having a filamentous core material were known. For example, Patent Document 1 discloses a filamentous adhesive, characterized by attaching an adhesive to a filamentous core material.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 3-231980 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] This adhesive material is filamentous, which gives it the following advantages: it is easy to apply to complex shapes such as curves, surfaces, and uneven surfaces, and it can also be applied to narrow areas. In addition, unlike liquid adhesives, there is no worry about liquid dripping or spilling.

[0009] Typically, these filamentous adhesive materials have a smaller contact area with the substrate compared to double-sided adhesive tape, resulting in lower adhesive strength. Therefore, they are mostly used for applications where high adhesive strength is not required, such as temporary fixation and bonding of lighter components. Reference 1 also discloses the use of filamentous adhesives for bonding lighter posters, temporarily fixing components or materials, and bonding office supplies.

[0010] Therefore, previous research aimed at improving the adhesive strength of filamentous adhesive materials has not been sufficiently conducted.

[0011] In view of the above, the objective of the present invention is to provide an adhesive article that is filamentous and has excellent adhesive strength.

[0012] Methods for solving problems

[0013] The inventors of this application conducted repeated and in-depth research and found that by using a core material that is easily deformable in the thickness direction (the direction perpendicular to the length direction) in an adhesive article having a filamentous core material, the above-mentioned problems can be solved, thus completing the present invention.

[0014] That is, the adhesive article of the present invention has a core material and an adhesive layer covering the surface of the core material along its length, wherein the core material is a multifilament having four or more filaments.

[0015] In one embodiment of the adhesive article of the present invention, the twist coefficient of the core material represented by formula (A) as described in the specification may be 0 or more and 200 or less.

[0016] In one embodiment of the adhesive article of the present invention, the core material may have a twist rate of 0 to 250 times / m.

[0017] In one embodiment of the adhesive article of the present invention, the filament may be a hollow yarn.

[0018] In one embodiment of the adhesive article of the present invention, the filaments may be chemical fibers.

[0019] The effects of the invention

[0020] The adhesive article of the present invention is filamentous and has excellent adhesive strength. Therefore, the adhesive article of the present invention can be applied to a wide range of uses.

[0021] This invention relates to the following:

[0022] Item 1, an adhesive article having a core material and an adhesive layer covering the longitudinal surface of the core material, wherein the core material is a multifilament having four or more filaments.

[0023] Item 2. The adhesive article according to Item 1, wherein the twist coefficient K of the core material represented by formula (A) is 0 or more and 200 or less.

[0024]

[0025] In formula (A), K is the twist coefficient, T is the number of twists (in [twists / m]), and D is the fineness (in [dtex]).

[0026] Item 3. The adhesive article according to item 1 or 2, wherein the core material has a twist rate of 0 to 250 times / m.

[0027] Item 4. The adhesive article according to any one of items 1 to 3, wherein the filament is a hollow filament.

[0028] Item 5. The adhesive article according to any one of items 1 to 4, wherein the filament is a chemical fiber. Attached Figure Description

[0029] [ Figure 1 ] Figure 1This is a cross-sectional view of the adhesive article according to the first embodiment of the present invention in a section perpendicular to the length direction.

[0030] [ Figure 2 ] Figure 2 (a) is a schematic diagram of the state in which the adhesive articles having a core material formed by a single filament (monofilament) are bonded together. Figure 2 (b) and (c) are schematic diagrams of the state in which the adhesive articles according to the first embodiment of the present invention are bonded together.

[0031] [ Figure 3 ] Figure 3 (a) is a perspective view illustrating the method for evaluating the adhesive force of adhesive articles according to the present invention. Figure 3 (b) is along Figure 3 A cross-sectional view of line AA in (a). Detailed Implementation

[0032] The embodiments of the present invention will now be described in detail. It should be noted that the present invention is not limited to the embodiments described below. Furthermore, in the following drawings, sometimes the same symbols are used to refer to components or parts that perform the same function, and sometimes repeated descriptions are omitted or simplified. Additionally, the embodiments described in the drawings are simplified for the purpose of clearly illustrating the present invention and do not necessarily accurately represent actual product dimensions or proportions.

[0033] Figure 1 This is a cross-sectional view of an adhesive article 10 according to an embodiment of the present invention in a section perpendicular to the length direction. The adhesive article 10 of this embodiment includes a core material 11 and an adhesive layer 12 covering the surface of the core material 11 in the length direction. The core material 11 is a multifilament having four or more filaments 13.

[0034] The adhesive article of this embodiment has excellent adhesive strength due to its structure. This will be explained in detail below.

[0035] The adhesive force (the degree to which the adhered objects are not easily separated) when using adhesive materials to bond them together is largely affected by the contact area between the adhesive material and the adhered objects. Figure 2 (a) shows a schematic diagram of the state in which the adhesive article 30, having a core material formed from a single filament (monofilament), is used to bond the objects 1 together. Because the core material of this adhesive article hardly deforms, the contact area with the objects being bonded is small, and therefore it is not easy to achieve high adhesive strength.

[0036] However, when using the adhesive article 10 of this embodiment to bond the adhered objects 1 together, such as Figure 2As shown in (b), each filament 13 constituting the core material 11 unfolds in a loosened manner, and the core material 11 deforms in a crushing manner. As a result, the adhesive article 10 of this embodiment can contact the object to be adhered with a wider area compared to adhesive articles having a core material formed from a single filament (monofilament).

[0037] In addition, the core material 11 in this embodiment has a wide surface area because it has four or more filaments 13, which increases the amount of adhesive attached per unit length.

[0038] For the reasons stated above, the adhesive article 10 of this embodiment can exert a higher adhesive force than adhesive articles with a core material of the same coarseness (fineness) and a core material formed from monofilaments.

[0039] To achieve the aforementioned effects, the core material 11 in this embodiment is a multifilament having four or more filaments 13. Furthermore, to further improve adhesion, 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, while maintaining the same thickness (fineness) of the core material 11, when the number of filaments 13 constituting the core material 11 increases, each filament becomes thinner (fineness decreases). If each filament becomes too thin, there is a concern that this will lead to a decrease in the strength and workability of the core material 11; therefore, the number of filaments constituting the core material 11 is preferably 300 or less.

[0040] Furthermore, the core material 11 in this embodiment can be either twisted yarn or untwisted yarn. That is, the twist count of the core material 11 in this embodiment can be higher than 0 times / m or lower than 0 times / m. In addition, the core material 11 in this embodiment can be formed by combining multiple strands of multifilament yarn, which are twisted or untwisted yarns, and twisting or not twisting them together.

[0041] When a force is applied in the direction that peels the adhered objects 1 together using the adhesive article 10 of this embodiment, such as Figure 2As shown in (c), each filament 13 is unfolded, and the core material 11 deforms in the coarse direction (the direction perpendicular to the length direction) by elongating in a direction parallel to the applied force. However, if the shape of the core material 11 becomes too distorted at this time, stress concentrates on the distorted portion, which is prone to becoming the starting point of peeling. Therefore, in order to obtain better adhesive strength, it is preferable that each filament 13 constituting the core material 11 has a certain degree of cohesion. As described above, the core material 11 in this embodiment can be an untwisted yarn or a twisted yarn, that is, the twist count of the core material 11 in this embodiment can be 0 times / m or more, but in order to make each filament 13 constituting the core material 11 have a certain degree of cohesion, it is preferable to twist the core material 11 in this embodiment. Specifically, the twist count of the core material 11 in this embodiment is preferably 30 times / m or more, more preferably 60 times / m or more, and even more preferably 90 times / m or more.

[0042] On the other hand, in order to allow the core material 11 to deform sufficiently when the adhered objects 1 are bonded together, and in order to increase the amount of adhesive adhered per unit length, it is preferable that the twist of the core material 11 is not too strong. Therefore, the twist of the core material 11 is preferably 3000 twists / m or less, more preferably 1500 twists / m or less, even more preferably 800 twists / m or less, and particularly preferably 250 twists / m or less.

[0043] Furthermore, when twisting the core material 11, it is preferable to control the twist coefficient, as expressed by the following formula (A), for the same reason as above. The twist coefficient is an indicator used to discuss the effects of twisting on the core material's cohesion, deformability, adhesive adhesion, etc., regardless of the core material's thickness. That is, the effect of the twist number on the core material varies depending on the core material's thickness, but if the twist coefficient is the same, it means that the effect of twisting on the core material is the same regardless of the core material's thickness.

[0044] In this embodiment, the twist coefficient of the core material is preferably 0 or higher, and more preferably higher than 0. On the other hand, when the twist coefficient is 200 or lower, the softness of the core material and even the adhesive article is improved, making it easier to adhere to complex shapes and narrow parts such as curves, bends, and uneven parts. Therefore, the twist coefficient of the core material is preferably 200 or lower, more preferably 170 or lower, even more preferably 100 or lower, even more preferably 80 or lower, and even more preferably less than 50.

[0045] [Mathematical Expression 1]

[0046]

[0047] It should be noted that in formula (A), K is the twist coefficient, T is the number of twists (in [twists / m]), and D is the fineness (in [dtex]).

[0048] The material of the filament 13 forming the core material 11 in this embodiment is not particularly limited; it can be either a chemical fiber or a natural fiber. Examples of chemical fibers include rayon, cupro fiber, cellulose acetate, Promix, nylon, aramid, vinylon, vinylidene fiber, polyvinyl chloride, polyester, acrylics, polyethylene, polypropylene, polyurethane, polyclaritative acid, and various other polymers, as well as glass, carbon fiber, synthetic rubber such as polyurethane, and metals. Examples of natural fibers include silk and natural rubber.

[0049] 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 prone to fuzzing and twisting. Therefore, when the filaments forming the core material in this embodiment are chemical fibers, it is less likely to generate a peeling initiation point, resulting in excellent adhesive strength.

[0050] Among chemical fibers, polyester or nylon are particularly preferred.

[0051] Furthermore, the filaments 13 forming the core material 11 in this embodiment can be hollow filaments. Generally speaking, hollow filaments are flexible in the thickness direction and easy to deform. Therefore, the core material obtained by using hollow filaments is also flexible in the thickness direction and easy to deform.

[0052] Therefore, when hollow yarns are used as the core material filaments, deformations such as core material crushing, as described above, are more likely to occur. Furthermore, when the core material is highly flexible, stress dispersion due to core material deformation easily occurs when force is applied in the direction of peeling apart the adhered objects used in the adhesive. This makes it less likely to apply stress at the interface (adhesive surface) between the adhesive and the adhered objects, thus reducing the likelihood of peeling. Based on these aspects, using hollow yarns as the core material filaments results in adhesive articles with exceptionally excellent adhesive strength.

[0053] It should be noted that hollow yarn is generally brittle, so when using hollow yarn as a core material filament, it is preferable to use it without twisting.

[0054] The fineness (fineness) of the core material 11 in this embodiment is not particularly limited. It can be adjusted appropriately according to the purpose of the adhesive article and the type of the object being adhered to, for example, around 20 to 2000 dtex.

[0055] It should be noted that the core material 11 can be formulated with various additives as needed, such as fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, and colorants (pigments, dyes, etc.). The surface of the core material can be treated with known or conventional surface treatments such as corona discharge treatment, plasma treatment, and primer coating.

[0056] In this embodiment, the adhesive layer 12 is formed using an adhesive. The adhesive used to form the adhesive layer 12 is not particularly limited, and known adhesives can be used. Examples include acrylic adhesives, rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamide adhesives, polyurethane adhesives, fluorinated adhesives, and epoxy adhesives. From the perspective of adhesion, rubber adhesives and acrylic adhesives are preferred, and acrylic adhesives are particularly preferred. It should be noted that only one type of adhesive can be used, or two or more types can be used in combination. Furthermore, the adhesive in this embodiment is preferably a pressure-sensitive adhesive that has adhesive properties at room temperature and can adhere the adhered object to its surface by the pressure generated when the surface of the adhesive comes into contact with the surface of the adhered object. If it is a pressure-sensitive adhesive, heating is not required, and it can be applied to heat-sensitive adhered objects.

[0057] Acrylic adhesives use polymers of monomers as the main agent. The monomers are mainly composed of alkyl methacrylates such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, and isononyl acrylate. Acrylonitrile, vinyl acetate, styrene, methyl methacrylate, acrylic acid, maleic anhydride, vinylpyrrolidone, glycidyl methacrylate, dimethylaminoethyl methacrylate, hydroxyethyl acrylate, and acrylamide, etc., as needed, to modify the adhesive.

[0058] Rubber-based adhesives are mainly composed of rubber polymers such as natural rubber, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene-butene-styrene block copolymer, styrene-butadiene rubber, polybutadiene, polyisoprene, polyisobutylene, butyl rubber, chloroprene rubber, and silicone rubber.

[0059] In addition, various additives such as rosin-based, terpene-based, styrene-based, aliphatic petroleum-based, aromatic petroleum-based, xylene-based, phenol-based, coumarone-indene-based, and their hydrides, as well as crosslinking agents, viscosity modifiers (tackifiers, etc.), leveling agents, peel modifiers, plasticizers, softeners, fillers, colorants (pigments, dyes, etc.), surfactants, antistatic agents, preservatives, anti-aging agents, ultraviolet absorbers, antioxidants, and light stabilizers can be appropriately incorporated into these adhesives.

[0060] It should be noted that both solvent-based and water-dispersible adhesives can be used as adhesives. However, water-dispersible adhesives are preferred in this regard because they enable high-speed coating, are environmentally friendly, and have minimal impact of the solvent on the core material 11 (swelling, dissolution).

[0061] To further improve the adhesive strength of the adhesive article 10 of this embodiment, it is preferable to have a large amount of adhesive attached to the core material. Specifically, the amount of adhesive attached to the adhesive article of this embodiment (weight of adhesive layer per unit length) 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 core material needs to be coated with adhesive multiple times during the manufacturing process, or the drying time of the applied adhesive is time-consuming, resulting in low manufacturing efficiency. Therefore, the amount of adhesive attached to 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.

[0062] In the adhesive article 10 of this embodiment, the adhesive layer 12 may cover the entire surface (the surface in the longitudinal direction) of the core material 11, or it may only cover a portion of the surface of the core material 11. Furthermore, the adhesive layer 12 is typically formed continuously, but is not limited to this form; for example, it may be formed as a regular pattern such as dots or stripes, or an irregular pattern. It should be noted that the end faces of the core material may or may not be covered by the adhesive layer 12. For example, if the adhesive article 10 is cut during manufacturing or use, the end faces of the core material 11 may not be covered by the adhesive layer 12.

[0063] Hereinafter, an example of a method for manufacturing the adhesive article 10 according to this embodiment will be described. It should be noted that the method for manufacturing the adhesive article 10 according to this embodiment is not limited to the method described below.

[0064] The adhesive article 10 of this embodiment can be obtained by applying an adhesive to the surface of the core material 11 using methods such as dipping, impregnation, or coating, followed by heating and drying. The adhesive can be applied using conventional coating machines such as gravure roller coaters, reverse roller coaters, roller coaters, dip roller coaters, bar coaters, doctor blade coaters, and spray coaters. The drying temperature and time are not particularly limited and can be set appropriately. 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.

[0065] The adhesive article 10 of this embodiment can be bonded to narrow components and narrow areas while suppressing spillage. It is also easy to apply to complex shapes such as curves, curved surfaces, and uneven surfaces, and can be easily disassembled (reprocessed), which makes it preferable. Furthermore, due to its excellent adhesive strength, it can be used for bonding various articles.

[0066] For example, the adhesive article 10 of this embodiment can be suitably used for fixing articles in the manufacture of electronic devices, and can be applied to fixing the narrow frame edges of mobile terminals such as mobile phones and smartphones.

[0067] Furthermore, when applying adhesive tape to objects with complex shapes such as curves, surfaces, or unevenness, the tape may wrinkle or overlap, making it difficult to prevent overflow and adhere smoothly. There are also concerns that wrinkles and overlaps can significantly reduce adhesive strength. While some have considered applying the tape by carefully cutting it into small pieces to avoid wrinkles and overlaps, this greatly deteriorates operability. On the other hand, the adhesive article 10 of this embodiment adheres firmly even to complex shapes such as curves, surfaces, or unevenness without wrinkles or overlaps. Moreover, the adhesive article 10 can be applied to the desired area in one step, thus offering excellent operability and making it suitable for automated production lines.

[0068] Specifically, the adhesive article 10 of this embodiment can be suitably used for, for example, fixing cables such as wires and optical fibers, LED fiber optic lights, fiber optic sensors such as FBG (Fiber Bragg Gratings), various wires (wire-like components) such as silk, ropes, and threads, and narrow-width components in a desired form.

[0069] Even when fixing wires or narrow components in complex shapes to other components, the adhesive article 10 according to this embodiment can suppress overflow, wrinkles, and overlap in accordance with the complex shape that the wires or narrow components should have, and can firmly fix them with excellent operability. It should be noted that when fixing wires or narrow components to other components, the adhesive article 10 of this embodiment can be pre-attached according to the shape in which the wires or narrow components should be fixed on the surface of the other component, and then the wires or narrow components can be attached to and fixed in accordance with the adhesive article attached to the surface of the other component. Alternatively, the adhesive article of this embodiment can be attached to the wires or narrow components, and then the wires or narrow components can be fixed to other components in the desired shape.

[0070] Furthermore, the adhesive article 10 of this embodiment can also be suitably used for the purpose of temporarily fixing one article to the surface of another article. More specifically, the adhesive article of this embodiment can be used for temporary fixing, for example, in the manufacture of textile products such as clothing, shoes, bags, and hats, and leather products. However, its uses are not limited to this, and it can be suitably used for various purposes where temporary fixing is desired.

[0071] For example, when fixing one item to the surface of another item, after temporarily fixing the first item to the surface of the second item using a filamentous adhesive material and positioning it, the two items are fixed (formally fixed) by methods such as heat pressing or sewing. In this case, the adhesive material according to this embodiment can easily bypass the fixing part provided between the two items for temporary fixing. For example, when sewing fiber products or leather products, if temporary fixing is performed using a filamentous adhesive material, it is easy to avoid the sewing part for temporary fixing, and it is easy to prevent the adhesive from adhering to the needle.

[0072] Furthermore, according to the adhesive article of this embodiment, as described above, even if the two articles have complex shapes such as curves, curved surfaces, or uneven surfaces, they can be well bonded while suppressing overflow, wrinkles, and overlap, and can be bonded in one step, making it easy to operate.

[0073] Furthermore, even for easily deformable components such as fabrics, cloths, and leathers that constitute fiber or leather products, temporary fixation using the adhesive material of this embodiment can suppress or prevent deformation of the components due to stretching, resulting in a good appearance after fixation (formal fixation).

[0074] Furthermore, according to the adhesive article of this embodiment, after two articles are fixed (formally fixed), the adhesive article of this embodiment can be easily pulled out and removed from between the fixed (formally fixed) two articles as needed. In this way, adhesive overflow can be prevented, and the deterioration of appearance caused by discoloration of residual adhesive over time can be effectively prevented.

[0075] Furthermore, according to this embodiment, the adhesive article 10 can also achieve functional compositing by making it into a filament that is twisted together with filaments made of other materials, or by interweaving filaments and fabrics (including non-woven fabrics and sheets) made of other materials.

[0076] Example

[0077] The present invention will be specifically described below through examples, but the present invention is not limited to these examples in any way.

[0078] [Creation of adhesive items]

[0079] <Example 1>

[0080] (Preparation of water-dispersible acrylic adhesives for forming adhesive layers)

[0081] In a reaction vessel equipped with a cooling pipe, a nitrogen inlet pipe, a thermometer, and a stirrer, 40 parts by weight of deionized water were added. Nitrogen gas was introduced while stirring at 60°C for at least 1 hour to perform nitrogen replacement. 0.1 parts by weight of 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropanediamine]n hydrate (polymerization initiator) were added to the reaction vessel. The system was maintained at 60°C, and monomer emulsion A was slowly added dropwise over 4 hours to initiate an emulsion polymerization reaction.

[0082] As monomer emulsion A, a substance was prepared by adding 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-methacryloyloxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name "KBM-503"), and 2 parts by weight of sodium polyoxyethylene lauryl sulfate (emulsifier) ​​to 30 parts by weight of deionized water and emulsifying the mixture. After the addition of monomer emulsion A was completed, the system was maintained at 60°C for 3 hours. After cooling the system to room temperature, the pH was adjusted to 7 by adding 10% ammonia water to obtain acrylic polymer emulsion (water-dispersible acrylic polymer) A.

[0083] For every 100 parts by weight of acrylic polymer contained in the aforementioned acrylic polymer emulsion A, 20 parts by weight of a tackifying resin emulsion (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "E-865NT") based on solid content was added. Furthermore, 10% by weight of ammonia water as a pH adjuster and polyacrylic acid (manufactured by Toa Synthetic Co., Ltd., trade name "ARON B-500") as a tackifier were used to adjust the pH to 7.2 and the viscosity to 10 Pa·s. Thus, a water-dispersible acrylic adhesive A for use in adhesive layers was obtained.

[0084] (Making adhesive items)

[0085] A multifilament (267 dtex) formed by untwisting 12 polyester filaments was used as the core material. A water-dispersible acrylic adhesive A was applied to the core material by dip-coating to achieve an adhesive adhesion of 65 mg / m in the resulting adhesive article, followed by drying at 80°C for 5 minutes to form an adhesive layer, thus obtaining the adhesive article of Example 1.

[0086] <Example 2>

[0087] Using a multifilament (280 dtex) formed by combining 48 untwisted polyester filaments as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 2.

[0088] <Example 3>

[0089] Using a multifilament (250 dtex) formed by untwisting 72 polyester filaments as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 3.

[0090] <Example 4>

[0091] Using a multifilament (280 dtex) obtained by twisting 48 polyester filaments (filaments) at 50 twists / m as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 4.

[0092] <Example 5>

[0093] The twist rate was set to 150 times / m, and otherwise operated in the same manner as in Example 4, to obtain the adhesive article of Example 5.

[0094] <Example 6>

[0095] The twist rate was set to 300 times / m, and otherwise operated in the same manner as in Example 4, to obtain the adhesive article of Example 6.

[0096] <Example 7>

[0097] The twist rate was set to 1000 twists / m, and otherwise operated in the same manner as in Example 4, to obtain the adhesive article of Example 7.

[0098] <Example 8>

[0099] Using a multifilament (110 dtex) formed by combining 24 hollow filaments without twisting as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 8.

[0100] <Example 9>

[0101] Two core materials used in Example 2 were joined together without twisting and used as core materials. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 9.

[0102] <Example 10>

[0103] Two core materials used in Example 2 were twisted together at 150 twists / m and used as core materials. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 10.

[0104] <Example 11>

[0105] The three core materials used in Example 2 were gathered together without twisting and used as core materials. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 11.

[0106] <Example 12>

[0107] The three core materials used in Example 2 were twisted together at 150 times / m and used as core materials. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 12.

[0108] <Example 13>

[0109] Using a multifilament (260 dtex) formed by combining four untwisted polyester filaments as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Example 13.

[0110] <Example 14>

[0111] The twist rate was set to 120 times / m, and otherwise operated in the same manner as in Example 1, to obtain the adhesive article of Example 14.

[0112] <Example 15>

[0113] The twist rate was set to 5 times / m, and otherwise operated in the same manner as in Example 4, to obtain the adhesive article of Example 15.

[0114] <Comparative Example 1>

[0115] Using a 280 dtex polyester filament as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Comparative Example 1.

[0116] <Comparative Example 2>

[0117] Using a multifilament (315 dtex) formed by combining three untwisted polyester filaments as the core material, the same procedure as in Example 1 was followed to obtain the adhesive article of Comparative Example 2.

[0118] [Evaluation of adhesive items]

[0119] For each of the obtained adhesive articles, the adhesive strength was evaluated using the following method.

[0120] <Evaluation of Adhesion Strength>

[0121] Using the adhesive materials described in the examples, a circular acrylic sheet 42 with a thickness of 3mm and a diameter of 70mm and a rectangular polycarbonate resin sheet 41 (short side 80mm, long side 110mm, thickness 10mm) with a rectangular slit (short side 30mm, long side 40mm) in the center are bonded together, so that the center of the acrylic sheet 42 is aligned with the center of the slit in the polycarbonate resin sheet 41, and pressed together with 2kg for 10 seconds. It should be noted that adhesive materials such as... Figure 3 As shown in (a) and (b), the acrylic sheet is arranged along its edge. A three-dimensional illustration of the bonded state is provided. Figure 3 (a), Figure 3 (a) The cross-sectional diagram of line AA is shown in Figure 1. Figure 3 (b)

[0122] Next, fix the polycarbonate resin plate 41, as follows: Figure 3 As shown in (b), a load was applied through the slit at the center of the acrylic sheet 42 along the direction of phase separation between the acrylic sheet 42 and the polycarbonate resin sheet 41, and the maximum load observed during the period until the acrylic sheet 42 and the polycarbonate resin sheet 41 separated was measured. The measurement results are shown in Table 1.

[0123] [Evaluation of Flexibility]

[0124] The following tests were conducted to evaluate the flexibility of the adhesives in each embodiment and comparative example. It should be noted that adhesives with excellent flexibility are preferred from the perspectives of easily producing deformations such as core material crushing as described above, thus resulting in excellent adhesive strength, and easily adapting to the shape of the bonded surface, which has complex shapes such as curves, surfaces, and unevenness.

[0125] First, a ring with a diameter of 5 cm is formed using the adhesives in each example. Next, the ring is deformed by pressing it from the outside to the inside with your fingers, and the softness is evaluated on a three-level scale based on the feel at this point, as shown below.

[0126] ○(Soft): It can deform with almost no resistance.

[0127] △ (Slightly soft): Slight resistance is felt during deformation. × (Hard): Significant resistance is felt during deformation.

[0128] [Table 1]

[0129]

[0130] In comparison with the adhesive articles of Examples 1 and 2, the number of filaments constituting the core material is small, resulting in poor adhesion.

[0131] On the other hand, the adhesive articles of Examples 1 to 15, in which the core material has four or more filaments, exhibited excellent adhesive strength.

[0132] [Crafting Adhesive Items]

[0133] <Examples 16-19>

[0134] Using six polyester filaments (long filaments), the filaments were assembled without twisting as in Example 16, and twisted with the twist numbers recorded in Table 2 as in Examples 17-19. The resulting multifilament (44 dtex) was used as the core material, and the amount of adhesive applied was varied as recorded in Table 2. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive articles of Examples 16-19.

[0135] <Examples 20-25>

[0136] Using eight core materials as used in Example 2, the materials were assembled without twisting in Example 20 and with twisting as described in Table 2 in Examples 21-25. The resulting multifilament (2240 ​​dtex) was used as the core material, and the amount of adhesive applied was varied as described in Table 2. Otherwise, the same procedure as in Example 1 was followed to obtain the adhesive articles of Examples 20-25.

[0137] [Evaluation of adhesive items]

[0138] For the adhesive articles of Examples 16-25, the adhesive strength was evaluated using the same method as described above. The results are presented together with those of Examples 2, 4-7 and 15 in Table 2.

[0139] [Table 2]

[0140]

[0141] Examples 4, 5, 15, 17, 18, and 21-23 exhibit particularly superior adhesion compared to other examples of the same fineness. This is believed to be due to the exceptionally suitable twist coefficient of the core material.

[0142] The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. Various modifications and substitutions can be made to the above embodiments without departing from the scope of the present invention.

[0143] It should be noted that this application is based on Japanese patent application filed on October 5, 2018 (Japanese Patent Application No. 2018-190115) and Japanese patent application filed on September 30, 2019 (Japanese Patent Application No. 2019-179321), the contents of which are incorporated herein by reference.

[0144] Explanation of reference numerals in the attached figures

[0145] 1. Adhesive

[0146] 10, 30, 40 adhesive items

[0147] 11 core material

[0148] 12 Adhesive Layer

[0149] 13 Filaments

[0150] 41 Polycarbonate resin board

[0151] 42 Acrylic sheet

Claims

1. A filamentous adhesive article comprising a core material and an adhesive layer covering the longitudinal surface of the core material, wherein the core material is a multifilament having 4 or more and 300 or fewer filaments. The core material has a twist rate of 50-150 times / m.

2. The filamentous adhesive article according to claim 1, wherein, The twist coefficient K of the core material, as expressed by formula (A), is higher than 0 and lower than 200. In formula (A), K is the twist coefficient, T is the number of twists, the unit of the number of twists is twists / m, and D is the fineness, the unit of the fineness is dtex.

3. The filamentous adhesive article according to claim 1 or 2, wherein, The core material is a multifilament having 10 or more but less than 300 filaments.

4. The filamentous adhesive article according to claim 1 or 2, wherein, The filament is a hollow filament.

5. The filamentous adhesive article according to claim 1 or 2, wherein, The filaments are chemical fibers.

Images