TW202405112A - Adhesive items - Google Patents

Abstract

The present invention relates to an adhesive article including a core material and an adhesive layer covering the longitudinal surface of the core material, and the core material is a multifilament yarn having four or more filaments.

Description

Adhesive items

The invention relates to an adhesive article.

Adhesive articles having a gauze-like core material have previously been known. For example, Patent Document 1 discloses a gauze-like adhesive device characterized by adhering an adhesive to a gauze-like core material. [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 3-231980

Since this kind of adhesive material is in the form of yarn, it has the advantage that it can be easily applied to complex shapes such as curves, curved surfaces, and concavities and convexities, and can also be applied to narrow parts. Also, unlike liquid adhesives, there is no risk of dripping or spilling.

Generally, compared with double-sided adhesive tapes, this kind of gauze-like adhesive article has less contact area with the adherend, so the adhesive force is lower. Therefore, it does not require high adhesion when temporarily joining or attaching relatively lightweight components. It is often used in power applications. Cited Document 1 also discloses the use of gauze-like adhesive tools for the adhesion of relatively lightweight posters, the temporary joining of parts or materials, the adhesion of office supplies, and the like. Therefore, previous research aimed at improving the adhesive force of gauze-like adhesive articles has not been sufficiently conducted.

In view of the above, it is an object of the present invention to provide a gauze-like adhesive article with excellent adhesive force. [Technical means to solve problems]

The inventors of the present invention have conducted diligent research and found that the above problems can be solved by using a core material that is easily deformed in the thickness direction (the direction perpendicular to the length direction) in an adhesive article having a gauze-like core material, and thus completed invention. That is, the adhesive article of the present invention includes a core material and an adhesive layer covering the longitudinal surface of the core material, and the core material is a multifilament yarn having four or more filaments.

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

In one aspect of the adhesive article of the present invention, the number of twists of the core material may be 0 to 250 times/m.

In one aspect of the adhesive article of the present invention, the filaments may also be hollow filaments.

In one aspect of the adhesive article of the present invention, the filaments may also be chemical fibers. [Effects of the invention]

The adhesive article of the present invention is in a gauze shape and has excellent adhesive power. Therefore, the adhesive article of the present invention can be used in a wide range of applications.

Hereinafter, embodiments of the present invention will be described in detail. In addition, the present invention is not limited to the embodiments described below. In addition, in the following drawings, members and parts that perform the same functions may be described with the same symbols attached, and repeated descriptions may be omitted or simplified. In addition, the embodiments described in the drawings are schematic in order to clearly explain the present invention, and do not necessarily accurately represent the dimensions or reduction ratio of actual products.

FIG. 1 is a cross-sectional view of an adhesive article 10 according to an embodiment of the present invention, taken along a cross-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 longitudinal surface of the core material 11, and the core material 11 is a multifilament yarn having four or more filaments 13. The adhesive article of this embodiment has excellent adhesive force by having this structure. This is explained in detail below.

The adhesive force (the difficulty of peeling off the adherends) when using adhesive items to bond adherends to each other is deeply affected by the contact area between the adhesive items and the adherends. FIG. 2(a) shows a schematic diagram of a state in which adherends 1 are bonded to each other using an adhesive article 30 having a core material including one yarn (monofilament). Since the core material of this kind of adhesive article hardly deforms, the contact area with the adherend is small, so it is difficult to exert high adhesive force.

However, when the adherends 1 are bonded to each other using the adhesive article 10 of this embodiment, as shown in FIG. 2(b) , each of the filaments 13 constituting the core material 11 spreads out, and the core material 11 expands. 11 Deformed by being crushed. Thereby, the adhesive article 10 of this embodiment can come into contact with the adherend over a wider area than an adhesive article having a core material including one yarn (monofilament). In addition, since the core material 11 in this embodiment has four or more filaments 13, its surface area is wide, and therefore the amount of adhesive adhered per unit length can be increased.

For the reason described above, the adhesive article 10 of this embodiment exhibits a higher adhesive force than an adhesive article having a core material containing a monofilament that has the same core thickness (fineness).

In order to obtain the above effects, the core material 11 in this embodiment is a multifilament yarn including four or more filaments 13 . In addition, in order to further improve the adhesive force, the number of filaments 13 constituting the core material 11 in this embodiment is preferably 10 or more, more preferably 15 or more, and still more preferably 20 or more. On the other hand, when the thickness (fineness) of the core material 11 is maintained at the same level, each filament becomes thinner (the fineness is smaller) as the number of the filaments 13 constituting the core material 11 increases. If each filament becomes too thin, the strength or handleability of the core material 11 may decrease. Therefore, the number of filaments constituting the core material 11 is preferably 300 or less.

In addition, the core material 11 in this embodiment may be a twisted yarn that has been twisted, or it may be an untwisted yarn that has not been twisted. That is, the number of twists of the core material 11 in this embodiment may exceed 0 times/m, or may be 0 times/m. In addition, the core material 11 in this embodiment may be a plurality of multifilament yarns in the form of twisted or untwisted yarns that are twisted or untwisted.

When force is applied in the direction in which the adherends 1 bonded together using the adhesive article 10 of this embodiment are peeled off from each other, as shown in FIG. 2(c) , each filament 13 expands, and the core material 11 Deform in the thickness direction (the direction perpendicular to the length direction) in a manner that extends in a direction parallel to the applied force. However, at this time, if the shape of the core material 11 is excessively flat, stress will be concentrated on the flat portion, and this portion will easily become a starting point for peeling. Therefore, in order to exert further excellent adhesion, it is preferable that each filament 13 constituting the core material 11 has a certain degree of regularity. As mentioned above, the core material 11 in this embodiment can be an untwisted yarn or a twisted yarn. That is, the number of twists of the core material 11 in this embodiment is 0 times/m or more. However, in order to make the core Each filament 13 of the material 11 has a certain degree of regularity, and it is preferable to twist the core material 11 in this embodiment. Specifically, the number of twists of the core material 11 in this embodiment is preferably 30 times/m or more, more preferably 60 times/m or more, and still more preferably 90 times/m or more. On the other hand, in order to fully deform the core material 11 when the adherends 1 are bonded to each other, and to increase the adhesion amount of the adhesive 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, further preferably 800 times/m or less, and particularly preferably 250 times/m or less.

Furthermore, when the core material 11 is twisted, from the same viewpoint as above, it is preferable to also control the twist coefficient represented by the following formula (A). The twist coefficient is an index used to discuss the impact of twist (impact on the regularity or ease of deformation of the core material, the amount of adhesive attached, etc.) regardless of the thickness of the core material. That is, the influence of the twist number on the core material varies depending on the thickness of the core material. However, if the twist coefficient is the same, it means that the influence of twist on the core material is the same regardless of the thickness of the core material. The twist coefficient of the core material in this embodiment is preferably 0 or more, and more preferably exceeds 0. On the other hand, if the twist coefficient is 200 or less, the softness of the core material and even the adhesive article increases, making it easier to adhere to complex shapes or narrow parts such as curved parts, bent parts, and uneven parts. Therefore, the twist coefficient 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 still more preferably less than 50.

[Number 1]

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

The material of the filaments 13 forming the core material 11 in this embodiment is not particularly limited and may be chemical fibers or natural fibers. Examples of chemical fibers include rayon, cupra fiber, acetate, Promix, nylon, aromatic polyamide, vinylon, vinylidene compounds, polyvinyl chloride, polyester, acrylic, polyethylene, and polypropylene. , polyurethane, polyvinyl chloride alcohol fiber, polylactic acid and other polymer materials, glass, carbon fiber, polyurethane and other synthetic rubber, metal, etc. Examples of natural fibers include silk, natural rubber, and the like.

From the viewpoint of adhesion, the filaments 13 forming the core material 11 in this embodiment are preferably chemical fibers. Chemical fibers are not easy to fluff or become flat. Therefore, if the filaments forming the core material in this embodiment are chemical fibers, peeling starting points are less likely to occur and excellent adhesive force is exhibited. Among chemical fibers, polyester or nylon are particularly preferred.

In addition, the filament 13 forming the core material 11 in this embodiment may be a hollow fiber. Generally, hollow fibers are flexible in the thickness direction and are easily deformed. Therefore, the core material obtained by using hollow fibers is also flexible in the thickness direction and is easily deformed. Therefore, when hollow fibers are used as the filaments forming the core material, the above-mentioned deformation such as flattening of the core material becomes more likely to occur. In addition, if the core material has high flexibility, when force is applied in the direction in which the adherends bonded together using an adhesive article are peeled off, the core material is easily deformed and stress is dispersed, so it is difficult to apply stress to the core material. The interface (adhesive surface) between adhesive items and adherends is less likely to peel off. According to the above aspect, if hollow fibers are used as the filaments forming the core material, an adhesive article having particularly excellent adhesive force can be obtained. Furthermore, hollow fibers are generally relatively brittle, so when hollow fibers are used as filaments forming the core material, it is preferably used without twisting.

The thickness (fineness) of the core material 11 in this embodiment is not particularly limited and can be appropriately adjusted according to the use of the adhesive article or the type of adherend, for example, about 20 to 2000 dtex.

Furthermore, fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, colorants ( Pigments, dyes, etc.) and other additives. The surface of the core material may also be subjected to known or conventional surface treatments such as corona discharge treatment, plasma treatment, and primer coating.

The adhesive layer 12 in this embodiment is formed of adhesive. The adhesive forming 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, and urethane adhesives. , fluorine-based adhesives, epoxy-based adhesives, etc. Among them, in terms of adhesiveness, a rubber-based adhesive or an acrylic-based adhesive is preferred, and an acrylic-based adhesive is particularly preferred. In addition, 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, which has adhesiveness at normal temperature and can use the pressure generated when the surface of the adhesive contacts the surface of the adherend to stick the adherend. on its surface. If it is a pressure-sensitive adhesive, there is no need to heat it, and it can also be applied to adherends that are not heat-resistant.

Acrylic adhesives are mainly composed of (meth)acrylic alkyl esters such as ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, and isononyl acrylate. Added acrylonitrile, vinyl acetate, styrene, methyl methacrylate, acrylic acid, maleic anhydride, vinylpyrrolidone, glycidyl methacrylate, dimethylaminoethyl methacrylate, hydroxyl acrylate Polymers of monomers made from modified monomers such as ethyl ester and acrylamide are used as the main agent.

The rubber adhesive is made of 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, silicone rubber and other rubber-based polymers are Main agent.

Furthermore, rosin-based, terpene-based, styrene-based, aliphatic petroleum-based, aromatic petroleum-based, xylene-based, phenolic-based, benzofuran-indene-based, and other hydrogenated adhesives can be appropriately blended into these adhesives. Adhesion-imparting resins or cross-linking agents, viscosity adjusters (tackifiers, etc.), leveling agents, peeling adjusters, plasticizers, softeners, fillers, colorants (pigments, dyes, etc.), surfactants, etc. , antistatic agents, preservatives, anti-aging agents, UV absorbers, antioxidants, light stabilizers and other additives.

Furthermore, as the adhesive, either a solvent-based adhesive or a water-dispersed adhesive can be used. Here, in terms of high-speed coating, environmental friendliness, and less impact (swelling, dissolution) of the solvent on the core material 11 , a water-dispersed adhesive is preferred.

In order to further improve the adhesive force of the adhesive article 10 of this embodiment, it is preferable that a large amount of adhesive is adhered to the core material. Specifically, the adhesive amount (per unit length) of the adhesive in the adhesive article of this embodiment is The weight of the adhesive layer) is preferably 5 mg/m or more, more preferably 8 mg/m or more, and further preferably 16 mg/m or more. On the other hand, if the adhesion amount of the adhesive is excessive, the adhesive must be applied to the core material multiple times during the manufacturing process or drying of the applied adhesive will take time, so the manufacturing efficiency is low. Therefore, the adhesion amount of the adhesive in the adhesive article of this embodiment is preferably 200 mg/m or less, more preferably 180 mg/m or less, and further preferably 160 mg/m or less.

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. In addition, the adhesive layer 12 is typically formed continuously, but is not limited to this form. For example, it may also be formed in a regular or random pattern such as dots or stripes. Furthermore, 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 use, the end surface of the core material 11 may not be covered by the adhesive layer 12 .

Hereinafter, an example of the manufacturing method of the adhesive article 10 of this embodiment is demonstrated. In addition, the manufacturing method of the adhesive article 10 of this embodiment is not limited to the following description. The adhesive article 10 of this embodiment can be obtained by applying an adhesive to the surface of the core material 11 using dip dyeing, dipping, coating, etc. and then heating and drying the adhesive. The adhesive can be coated using, for example, a gravure roll coater, a reverse roll coater, a contact roll coater, a dip roll coater, a rod coater, a blade coater, or a spray coating. Use a commonly used coating machine such as a machine. 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, particularly preferably 10 seconds to 5 minutes.

The adhesive article 10 of this embodiment can be attached to narrow members or narrow-width areas while suppressing overflow. It can also be easily applied to complex shapes such as curves, curved surfaces, and concavities and convexes, and can be easily disassembled (secondary processing). It's also better. Furthermore, because of its excellent adhesion, it can be used to adhere various items. For example, the adhesive article 10 of this embodiment can be preferably used for fixing items in the manufacturing of electronic devices, and can be used for fixing narrow edges of mobile terminals such as mobile phones or smart phones.

Furthermore, when the adhesive tape is applied to an adherend that has a complex shape such as a curve, curved surface, or concave and convex, the adhesive tape will wrinkle or overlap in that part, making it difficult to prevent overflow and adhere neatly. , there is a risk that wrinkles or overlapping parts may cause a decrease in adhesion. In addition, it is also considered to adhere the adhesive tape while cutting it finely, so that the adhesive tape can be attached without wrinkles or overlap, but the workability will be greatly deteriorated. On the other hand, as long as the adhesive article 10 of this embodiment is attached to a complex-shaped part such as a curve, a curved surface, or an uneven shape, it can be firmly attached without causing wrinkles or overlap. Furthermore, since the adhesive article 10 can be attached to the part to be attached in one step at a time, it has excellent workability and can be applied to an automated production line. Specifically, the adhesive article 10 of this embodiment can be preferably used for, for example, connecting cables such as electric wires or optical fibers, LED fiber optic lamps, fiber optic sensors such as FBG (Fiber Bragg Gratings), wires, and ropes. , metal wires and other various wires (linear members) or narrow members are used to fix them in the desired form. Even when a wire or a narrow-width member is fixed to other members in a complex shape, the adhesive article 10 of this embodiment can suppress overflow or wrinkles according to the complex shape that the wire or narrow-width member should have. The pleated and overlapping sides are firmly fixed with excellent workability. Furthermore, when a wire or a narrow-width member is to be fixed to another member, the adhesive article 10 of this embodiment can be attached in advance according to the form in which the wire or narrow-width member is to be fixed on the surface of the other member. , attach and fix wires or narrow-width components based on adhesive items attached to the surface of other components. Alternatively, after the adhesive article of this embodiment is attached to the wire or narrow-width member, the wire or narrow-width member can be fixed to other members in a desired form.

In addition, the adhesive article 10 of this embodiment can also be preferably used for temporarily fixing (temporarily joining) an article to the surface of another article. More specifically, the adhesive article of this embodiment can be used for temporary fixing (temporary joining) when manufacturing fiber products such as clothes, boots, bags, and hats, or leather products. However, its use is not limited to this, and it is preferably used in various uses that require temporary fixing (temporary joining). For example, when fixing an item to the surface of another item, a gauze-like adhesive item is used to temporarily fix the item to the surface of the other item and position it, and then the two items are fixed together by heat pressure bonding or sewing. Fixed (officially fixed). In this case, as long as it is an adhesive article according to this embodiment, it is easy to temporarily fix it while avoiding the fixing portion provided between the two articles. For example, when sewing fiber products or leather products, if a gauze-like adhesive material is used for temporary fixation, the temporary fixation can be easily avoided while avoiding the sewing part, and the adhesive can be easily prevented from adhering to the needle. In addition, as long as the adhesive article of this embodiment is used, as mentioned above, even if the shape of the two articles is a complex shape such as a curve, a curved surface, an uneven shape, etc., they can adhere well while suppressing overflow, wrinkles, or overlapping, and can also It can be attached in one step and has good workability. In addition, even if it is a member that is easily deformed, such as cloth, cloth, leather, etc. constituting fiber products or leather products, it is possible to suppress or prevent deformation of the member due to stretching by temporarily fixing it with the adhesive article of this embodiment. After deformation and fixation (formal fixation), the design becomes better. Furthermore, as long as it is the adhesive article of this embodiment, after the two articles are fixed (formally fixed), the adhesive article of this embodiment can be easily pulled out and removed from between the two fixed (formally fixed) articles if necessary. If you do this, you can prevent the adhesive from overflowing and effectively prevent the deterioration of the design caused by the discoloration of the remaining adhesive over time.

In addition, as long as it is the adhesive article 10 of this embodiment, it can also be twisted with yarns made of other materials to form a combined yarn, or knitted together with yarns or cloths (including nonwoven fabrics and sheets) made of other materials. Realize the compounding of functions. [Example]

Hereinafter, the present invention will be specifically described using examples, but the present invention is not limited in any way by these examples.

[Making of adhesive items] <Example 1> (Preparation of water-dispersed acrylic adhesive for adhesive layer formation) In a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer, 40 parts by weight of ion-exchange water was placed, and while introducing nitrogen gas, the reaction vessel was stirred at 60° C. for more than 1 hour to perform nitrogen replacement. In the reaction vessel, 0.1 part by weight of 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine]n hydrate (polymerization initiator) was added. While maintaining the system at 60°C, monomer emulsion A was slowly 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), and γ-methacrylyl group were used. 0.02 parts by weight of oxypropyltrimethylsilane (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name "KBM-503") and 2 parts by weight of polyoxyethylene sodium lauryl sulfate (emulsifier) were added to 30 parts by weight of ion-exchange water It is emulsified. After finishing the dropwise addition of monomer emulsion A, the system was kept at 60° C. for 3 hours, and the system was cooled to room temperature. The pH value was adjusted to 7 by adding 10% ammonia water to obtain an acrylic polymer emulsion (water). Dispersed acrylic polymer)A. For every 100 parts by weight of the acrylic polymer contained in the above-mentioned acrylic polymer emulsion A, 20 parts by weight of an adhesion-imparting resin emulsion (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "E- 865NT”). Furthermore, using 10 mass % ammonia water as a pH adjuster and polyacrylic acid (manufactured by Toagosei Co., Ltd., trade name "Aron B-500") as a tackifier, the pH value was adjusted to 7.2, and the viscosity was adjusted to 10 pa·s. In this way, the water-dispersed acrylic adhesive A for the adhesive layer was obtained.

(Production of adhesive items) The core material is a multifilament yarn (267 dtex) that is gathered together without twisting 12 polyester yarns (filaments). It is formed by applying water-dispersed acrylic adhesive A to the core material by dip dyeing so that the adhesion amount of the adhesive in the obtained adhesive article becomes 65 mg/m, and then drying it at 80°C for 5 minutes. adhesive layer to obtain the adhesive article of Example 1.

<Example 2> The adhesive article of Example 2 was obtained in the same manner as in Example 1, except that a multifilament yarn (280 dtex) obtained by untwisting 48 polyester yarns (filaments) was used as a core material.

<Example 3> The adhesive article of Example 3 was obtained in the same manner as in Example 1, except that a multifilament yarn (250 dtex) obtained by untwisting 72 polyester yarns (filaments) was used as a core material.

<Example 4> Example 4 was obtained in the same manner as in Example 1, except that 48 polyester yarns (filaments) were twisted 50 times/m and a multifilament yarn (280 dtex) was used as the core material. Adhesive items.

<Example 5> The adhesive article of Example 5 was obtained in the same manner as in Example 4 except that the number of twists was 150 times/m.

<Example 6> The adhesive article of Example 6 was obtained in the same manner as in Example 4 except that the number of twists was 300 times/m.

<Example 7> The adhesive article of Example 7 was obtained in the same manner as Example 4 except that the number of twists was 1000 times/m.

<Example 8> The adhesive article of Example 8 was obtained in the same manner as in Example 1, except that a multifilament yarn (110 dtex) assembled without twisting 24 hollow fibers was used as the core material.

<Example 9> The 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 gathered together without twisting and used as a core material.

<Example 10> The adhesive article of Example 10 was obtained in the same manner as in Example 1, except that the two core materials used in Example 2 were twisted 150 times/m and collected together to be used as core materials.

<Example 11> The 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 collected without twisting and used as a core material.

<Example 12> The adhesive article of Example 12 was obtained in the same manner as in Example 1, except that the three core materials used in Example 2 were twisted 150 times/m and collected together to be used as core materials.

<Example 13> The adhesive article of Example 13 was obtained in the same manner as in Example 1, except that a multifilament yarn (260 dtex) obtained by untwisting four polyester yarns (filaments) was used as the core material.

<Example 14> The adhesive article of Example 14 was obtained in the same manner as in Example 1 except that the number of twists was 120 times/m.

<Example 15> The adhesive article of Example 15 was obtained in the same manner as in Example 4 except that the number of twists was 5 times/m.

＜Comparative example 1＞ The 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.

＜Comparative example 2＞ The adhesive article of Comparative Example 2 was obtained in the same manner as in Example 1, except that a multifilament yarn (315 dtex) obtained by untwisting three polyester yarns (filaments) was used as the core material.

[Evaluation of adhesive items] For each obtained adhesive article, the adhesive force was evaluated by the following method. ＜Evaluation of Adhesion＞ Using the adhesive materials of each example, a circular acrylic plate 42 with a thickness of 3 mm and a diameter of 70 mm and a rectangular polycarbonate resin plate 41 with a rectangular slit (30 mm on the short side and 40 mm on the long side) in the center were made. (The short side is 80 mm, the long side is 110 mm, and the thickness is 10 mm). The center of the acrylic plate 42 is aligned with the center of the slit of the polycarbonate resin plate 41, and the pressure is 2 kg for 10 seconds. Furthermore, as shown in Figures 3(a) and (b), the adhesive items are arranged along the edge of the acrylic plate. A perspective view of the bonded state is shown in Figure 3(a), and a cross-sectional view along line A-A of Figure 3(a) is shown in Figure 3(b). Then, the polycarbonate resin plate 41 is fixed, as shown in Figure 3(b), and a load is applied to the center of the acrylic plate 42 through the slit in the direction in which the acrylic plate 42 and the polycarbonate resin plate 41 separate. 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.

[Evaluation of softness] The following test was used to evaluate the softness of the adhesive bodies of each Example and Comparative Example. Furthermore, in terms of being prone to the above-mentioned deformation such as flattening of the core material and having excellent adhesion, or being easily deformed by an adherend surface having complex shapes such as curves, curved surfaces, and concavities and convexes, it is preferable to have excellent flexibility. The adhesive body. First, use the adhesive in each example to form a ring with a diameter of 5 cm. Next, the obtained ring was pressed with a finger from the outside toward the inside to deform it, and based on the feeling at this time, the softness was evaluated on a three-level basis as follows. ○(Soft): It can be deformed with almost no resistance. Δ (slightly soft): Slight resistance is felt when deforming. × (Hard): Greater resistance is felt when deforming.

[Table 1] No. Filament material root number[this] Number of twists [times/m] Fineness [dtex] Twist coefficient Evaluation Adhesion [N/22 cm] Softness Example 1 polyester 12 0 267 0 11 ○ Example 2 48 0 280 0 19 ○ Example 3 72 0 250 0 17 ○ Example 4 48 50 280 8 twenty one ○ Example 5 48 150 280 25 28 ○ Example 6 48 300 280 50 13 Δ Example 7 48 1000 280 167 13 Δ Example 8 hollow filament twenty four 0 110 0 48 ○ Example 9 polyester 96 0 560 0 25 Δ Example 10 96 150 560 35 32 Δ Example 11 144 0 840 0 twenty three Δ Example 12 144 150 840 43 31 Δ Example 13 4 0 260 0 12 Δ Example 14 12 120 267 20 19 ○ Example 15 48 5 280 1 20 ○ Comparative example 1 polyester 1 0 280 0 4 × Comparative example 2 3 0 315 0 6 Δ

The adhesive articles of Comparative Examples 1 and 2 have a smaller number of filaments constituting the core material, and the adhesive force is poor. On the other hand, the adhesive articles of Examples 1 to 15 in which the core material has four or more filaments exhibit excellent adhesive force.

[Preparation of adhesive items] <Examples 16 to 19> Using 6 polyester yarns (filaments), they were assembled without twisting for Example 16. For Examples 17 to 19, they were twisted in the amount described in Table 2 and assembled, and the obtained multifilament yarn (44 dtex) was As a core material, the adhesive articles of Examples 16 to 19 were obtained in the same manner as in Example 1, except that the adhesion amount of the adhesive was changed as described in Table 2.

<Examples 20 to 25> Eight of the core materials used in Example 2 were combined without twisting for Example 20, and the number of twists listed in Table 2 for Examples 21 to 25 were combined, and the obtained multifilament yarn (2240 dtex ) as the core material, and except that the adhesion amount of the adhesive was changed as described in Table 2, the adhesive articles of Examples 20 to 25 were obtained in the same manner as in Example 1.

[Evaluation of adhesive items] For the adhesive articles of Examples 16 to 25, the adhesive force was evaluated by the same method as above. The results are shown in Table 2 together with the results of Examples 2, 4 to 7, and 15.

[Table 2] Core Adhesive Evaluation No. Filament material root number[this] Fineness [dtex] Theoretical diameter [μm] Number of twists [times/m] Twist coefficient Adhesion amount [mg/m] Theoretical thickness [μm] Adhesion [N/22 cm] Example 16 polyester 6 44 60 0 0 15 40 14 Example 17 150 10 15 40 16 Example 18 600 40 15 40 20 Example 19 1000 66 15 40 12 Example 2 48 280 160 0 0 65 90 19 Example 15 5 1 65 90 20 Example 4 50 8 65 90 twenty one Example 5 150 25 65 90 28 Example 6 300 50 65 90 13 Example 7 1000 167 65 90 13 Example 20 384 2240 430 0 0 130 80 11 Example 21 20 9 130 80 33 Example 22 50 twenty four 130 80 39 Example 23 75 35 130 80 35 Example 24 150 71 130 80 30 Example 25 350 166 130 80 28

Compared with other examples of the same fineness, Examples 4, 5, 15, 17, 18, 21 to 23 have particularly excellent adhesion. The reason for this is that the twist coefficient of the core material is particularly suitable.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention.

Furthermore, this application is based on the Japanese patent application filed on October 5, 2018 (Japanese Patent Application No. 2018-190115) and the Japanese patent application filed on September 30, 2019 (Japanese Patent Application No. 2019-179321 ), the contents are incorporated into this application as a reference.

1: Adhered body 10: Adhesive items 11: Core material 12: Adhesive layer 13:Filament 30: Adhesive items 40: Adhesive items 41:Polycarbonate resin board 42:Acrylic board

Fig. 1 is a cross-sectional view of the adhesive article according to the first embodiment of the present invention, taken along a cross-section perpendicular to the longitudinal direction. Figure 2(a) is a schematic diagram showing a state in which adherends are bonded to each other using an adhesive article having a core material including a single yarn (monofilament). Figures 2(b) and (c) are diagrams showing the use of the present invention. A schematic diagram showing a state in which the adhesive articles of the first embodiment adhere to adherends. Fig. 3(a) is a perspective view for explaining the method for evaluating the adhesive force of the adhesive article of the present invention, and Fig. 3(b) is a cross-sectional view taken along line A-A in Fig. 3(a).

Claims (4)

an adhesive item, It has a core material and an adhesive layer covering the surface of the core material in the length direction. The above-mentioned core material is a multifilament yarn with more than 4 filaments, and The number of twists of the above-mentioned core material is 0 to 250 times/m. For example, the adhesive article of claim 1, wherein the twist coefficient K of the above-mentioned core material represented by formula (A) is 0 or more and 200 or less, [Number 1] (In formula (A), K is the twist coefficient, T is the twist number (unit is [times/m]), and D is the fineness (unit is [dtex])). Such as the adhesive article of claim 1 or 2, wherein the above-mentioned filaments are hollow filaments. The adhesive article according to any one of claims 1 to 3, wherein the filaments are chemical fibers.