Adhesive sheet and method for enhancing adhesive force

Abstract

To provide an adhesive sheet that resists detachment from a textile product when bonded thereto.SOLUTION: An adhesive sheet 1 comprises: a base material 3; and an adhesive layer 5 laminated on the base material 3 and including an adhesive, the adhesive sheet 1 being bonded to a textile product via the adhesive layer 5. The base material 3 contains a fragrance compound having a terpene structure and / or a carbonyl group. The fragrance compound preferably has a monoterpene structure and / or a sesquiterpene structure as the terpene structure, and preferably has at least one group selected from the group consisting of an ester group, a ketone group, and an aldehyde group as the carbonyl group.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an adhesive sheet to be adhered to a textile product, and a method for enhancing the adhesive strength of an adhesive. [Background technology]

[0002] Conventionally, fragrances have been imparted to cloth products such as masks and paper products (hereinafter referred to as textile products). For example, a fragrance sheet for application to a mask has been proposed (Patent Document 1), which comprises a substrate, an adhesive layer laminated on one side of the substrate, and a carrier member laminated on the other side, and in which a fragrance is carried on the carrier member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-105643 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since textile products have gaps between the fibers that make up the product, and the adhesive surface area between the textile product and the adhesive sheet is small by the amount of the gaps, the adhesive sheet adhered to the textile product is easily peeled off, and it is difficult to keep the adhesive sheet adhered to the textile product for a long period of time. In particular, when the textile product is a mask, the mask is easily moistened by exhaled breath, etc., and there is a risk that the adhesive strength of the adhesive sheet will decrease due to moisture.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide an adhesive sheet that is difficult to peel off from a textile product when adhered to the textile product, and a method for enhancing the effectiveness of the adhesive. [Means for solving the problem]

[0006] The characteristic configuration of the pressure-sensitive adhesive sheet according to the present invention for solving the above problems is as follows: A substrate; an adhesive layer including an adhesive laminated on the substrate; A pressure-sensitive adhesive sheet that is adhered to a textile product by the pressure-sensitive adhesive layer, The base material contains a fragrance compound having a terpene structure and / or a carbonyl group.

[0007] According to the adhesive sheet of this configuration, when the fragrance compound having a terpene structure and / or a carbonyl group comes into contact with the adhesive in the adhesive layer, the adhesive strength of the adhesive can be surprisingly increased. As a result, the adhesive sheet is less likely to peel off when adhered to a textile product. Although the mechanism by which the adhesive strength of the adhesive is increased by the contact between the fragrance compound and the adhesive is not clear, it is presumed that the terpene structure and / or the carbonyl group of the fragrance compound have some effect on the adhesive, thereby increasing its adhesive strength.

[0008] In the pressure-sensitive adhesive sheet according to the present invention, The flavor compound preferably has a monoterpene structure and / or a sesquiterpene structure as the terpene structure.

[0009] According to the pressure-sensitive adhesive sheet of the present configuration, the fragrance compound has the above-mentioned structure as a terpene structure, and therefore the adhesive strength of the pressure-sensitive adhesive can be further enhanced.

[0010] In the pressure-sensitive adhesive sheet according to the present invention, The fragrance compound preferably has, as the carbonyl group, one or more groups selected from the group consisting of an ester group, a ketone group, and an aldehyde group.

[0011] According to the pressure-sensitive adhesive sheet of the present configuration, the fragrance compound has the above group as a carbonyl group, so that the adhesive strength of the pressure-sensitive adhesive can be further enhanced.

[0012] In the pressure-sensitive adhesive sheet according to the present invention, The flavor compound is preferably one or a mixture of two or more selected from the group consisting of piperitone, menthone, linalool, menthol, β-caryophyllene, dihydromyrcenol, 1,8-cineole, pulegone, menthofuran, p-menthane-3,8-diol, allyl hexanoate, α-damascone, p-anisaldehyde, isopulegol, α-terpineol, β-terpineol, γ-terpineol, and δ-terpineol.

[0013] According to the pressure-sensitive adhesive sheet of the present configuration, by selecting the above-mentioned compound as the fragrance compound, the adhesive strength of the pressure-sensitive adhesive can be further enhanced.

[0014] In the pressure-sensitive adhesive sheet according to the present invention, The content of the fragrance compound is 0.7 μg / cm 2 More preferably, it is equal to or greater than this.

[0015] According to the pressure-sensitive adhesive sheet of the present configuration, by setting the content of the fragrance compound within the above range, the adhesive strength of the pressure-sensitive adhesive can be further enhanced.

[0016] In the pressure-sensitive adhesive sheet according to the present invention, The pressure-sensitive adhesive is preferably an acrylic pressure-sensitive adhesive.

[0017] According to the adhesive sheet of this configuration, when the adhesive is an acrylic adhesive, the adhesive strength can be more reliably enhanced by the fragrance compound. Although the mechanism by which the adhesive strength is enhanced when the adhesive is an acrylic adhesive is not clear, it is presumed that the fragrance compound acts on the crosslinked structure of the acrylic resin contained in the acrylic adhesive so as to enhance the adhesive strength of the acrylic adhesive.

[0018] In the pressure-sensitive adhesive sheet according to the present invention, The content of the adhesive is 1 to 10 mg / cm 2 It is preferable that:

[0019] According to the adhesive sheet of the present configuration, by setting the content of the adhesive in the above range, the adhesive sheet can be more firmly attached to the textile product. In addition, since the adhesive sheet contains an appropriate amount of adhesive, the adhesive strength is also appropriately enhanced by the fragrance compound.

[0020] In the pressure-sensitive adhesive sheet according to the present invention, The mass ratio (B / A) of the content (B) of the adhesive to the content (A) of the fragrance compound is preferably 0.7-500.

[0021] According to the adhesive sheet of the present configuration, by setting the mass ratio (B / A) of the adhesive content (B) to the fragrance compound content (A) within the above range, the adhesive strength of the adhesive can be further enhanced by the fragrance compound.

[0022] In the pressure-sensitive adhesive sheet according to the present invention, The substrate is A film layer; a nonwoven fabric layer laminated on one surface of the film layer; Including, The adhesive layer is laminated on the other surface of the film layer, It is preferable that the nonwoven fabric layer contains the fragrance compound.

[0023] According to the adhesive sheet of this configuration, a film layer is interposed between the nonwoven fabric layer and the adhesive layer of the substrate, and the fragrance compound in the nonwoven fabric layer and the adhesive in the adhesive layer are not in direct contact with each other. Even when the fragrance compound and the adhesive are not in direct contact with each other, the adhesive strength of the adhesive can be enhanced, and the advantages of the present invention are enhanced. Even when a film layer is interposed between the fragrance compound and the adhesive, the mechanism by which the fragrance compound enhances the adhesive strength of the adhesive is not clear, but is presumed to be as follows. That is, fragrance compounds having a terpene structure and / or a carbonyl group are volatile and emit a fragrance by volatilization, and it is presumed that the volatilized fragrance compound (i.e., gaseous fragrance compound) acts on the adhesive to enhance its adhesive strength.

[0024] In the pressure-sensitive adhesive sheet according to the present invention, The textile product is preferably a mask.

[0025] When the textile product is a mask, the mask is easily moistened by exhaled breath, etc., so the adhesive strength of the adhesive in the adhesive layer is reduced, and the adhesive sheet tends to be easily peeled off from the mask. However, according to the adhesive sheet of the present configuration, the adhesive strength of the adhesive can be increased by the fragrance compound, so that even when the textile product is a mask, the adhesive sheet is difficult to peel off from the mask. Therefore, the superiority of the present invention is enhanced.

[0026] The characteristic configuration of the adhesive strength enhancing method according to the present invention for solving the above problems is as follows: A method for enhancing the adhesive strength of an adhesive, comprising the steps of: The objective of the present invention is to bring a fragrance compound having a terpene structure and / or a carbonyl group into contact with the adhesive.

[0027] According to the method for enhancing adhesive strength of the present invention, as described above, it is surprisingly possible to enhance the adhesive strength of an adhesive by using a fragrance compound. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a cross-sectional view that illustrates an example of the layer structure of a pressure-sensitive adhesive sheet according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the embodiments of the adhesive sheet and adhesive force enhancing method of the present invention will be described. However, the layer structure shown in the figure is appropriately exaggerated or simplified for ease of explanation, and the relationship between the thickness of each layer and the scale relationship do not necessarily accurately reflect the actual adhesive sheet. Furthermore, the present invention is not intended to be limited to the configuration described in the embodiment described below. In addition, when there is a notation "~" indicating a numerical range in this specification, it means that the numerical range includes each numerical value between "~" as an upper limit value and a lower limit value, and each upper limit value and each lower limit value may be appropriately combined to form a numerical range.

[0030] [Adhesive sheet] 1 is a cross-sectional view showing a schematic example of the layer structure of an adhesive sheet 1 of the present embodiment. The adhesive sheet 1 includes a substrate 3 and an adhesive layer 5 containing an adhesive laminated on the substrate 3, and is adhered to a textile product (not shown) by the adhesive layer 5, and the substrate 3 contains a fragrance compound.

[0031] Specifically, the adhesive sheet 1 comprises a substrate 3 including a film layer 31 and a nonwoven fabric layer 33, an adhesive layer 5 formed from an adhesive, and a release sheet (separator) 7 laminated on the adhesive layer 5, and the nonwoven fabric layer 33 of the substrate 3 contains a fragrance compound.

[0032] <Textile products> Examples of the textile product include woven fabrics, knitted fabrics, and nonwoven fabrics. Of these, nonwoven fabrics are preferred. When the textile product is a nonwoven fabric, the gaps between the fibers are smaller than those in the case of woven fabrics or knitted fabrics, so that the adhesive that has entered the gaps is less likely to come off, and the adhesive strength of the adhesive can be increased from a structural standpoint. Examples of the raw materials constituting the textile product include natural fibers, synthetic fibers, and the like, such as polyethylene, polypropylene, polyester, polylactic acid, and cotton.

[0033] Examples of textile products include various clothing products, hats, handkerchiefs, towels, masks, bedding, noren curtains, curtains, etc., but masks are preferred. When the textile product is a mask, the mask is easily moistened by exhaled breath, etc., so that the adhesive strength of the adhesive in the adhesive layer 5 is reduced, and the adhesive sheet 1 tends to be easily peeled off from the mask. However, according to the adhesive sheet 1, the adhesive strength of the adhesive can be increased by the fragrance compound, so that even when the textile product is a mask, the adhesive sheet 1 is difficult to peel off from the mask. Therefore, the superiority of the adhesive sheet 1 of this embodiment is enhanced.

[0034] <Base material> The substrate 3 includes a film layer 31 and a nonwoven fabric layer 33 laminated on one surface of the film layer 31 .

[0035] (Film layer) The film layer 31 preferably has a barrier property that blocks the permeation of gases such as water vapor and oxygen. Examples of such a film layer 31 include resin sheets made of polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyacrylonitrile, polyamide, and the like, and aluminum foil. The thickness of the film layer 31 is preferably 3 μm or more, more preferably 10 μm or more. By setting the thickness of the film layer 31 to the above-mentioned lower limit or more, it is possible to suppress the passage of gas through the film layer 31 and suppress the decrease in adhesive force caused by contact between the adhesive layer 5 and the gas. In addition, it is possible to suppress a lack of strength, and thus it is possible to suppress the occurrence of cracks and the like that allow the gas to pass through. The thickness of the film layer 31 is preferably 100 μm or less, more preferably 70 μm or less. By setting the thickness of the film layer 31 to the above-mentioned upper limit or less, it is possible to suppress an unnecessary increase in mass and rigidity.

[0036] (Non-woven layer) The nonwoven fabric layer 33 contains a fragrance compound and is laminated on one surface of the film layer 31. The nonwoven fabric layer 33 is preferably impregnated with the fragrance compound. The nonwoven fabric layer 33 is preferably thermally bonded to the film layer 31. In this respect, the nonwoven fabric layer 33 is preferably made of a resin having thermal adhesion properties. Such a resin is preferably a polyolefin resin such as polypropylene. The nonwoven fabric layer 33 is preferably made by blending the above resin with pulp fibers, since this can enhance the absorption (impregnation) of the fragrance compound.

[0037] The weight of the nonwoven fabric layer 33 is 40 to 80 g / m 2 is preferable, and 65 to 75 g / m 2 is more preferred.

[0038] The nonwoven fabric layer 33 may be provided with various patterns, such as characters, animals, etc., by printing or the like.

[0039] The nonwoven fabric layer 33 is directly bonded to the film layer 31. The nonwoven fabric layer 33 may be indirectly bonded to the film layer 31 via an adhesive such as an acrylic adhesive, a rubber adhesive, a vinyl ether adhesive, or a silicone adhesive. The film layer 31 side of the nonwoven fabric layer 33 may be coated with or contain wax or the like. These adhesives and waxes can adsorb fragrance compounds, thereby enhancing the retention of the fragrance compounds in the base material 3.

[0040] When the substrate 3 has a film layer 31 and a nonwoven fabric layer 33, the fragrance compound contained in the nonwoven fabric layer 33 cannot pass through the film layer 31 even if it is in a liquid or solid state, or volatilized into a gaseous state. Therefore, the fragrance compound comes into contact with the adhesive of the adhesive layer 5 via the external environment (air). In this way, even if the film layer 31 is interposed between the nonwoven fabric layer 33 and the adhesive layer 5 of the substrate 3, and the fragrance compound in the nonwoven fabric layer 33 and the adhesive in the adhesive layer 5 are not in direct contact with each other, the adhesive strength of the adhesive can be enhanced. Therefore, the advantages of the adhesive sheet are enhanced. The mechanism by which the fragrance compound enhances the adhesive strength of the adhesive even when the film layer 31 is interposed between the fragrance compound and the adhesive is not clear, but is presumed to be as follows. In other words, fragrance compounds having a terpene structure and / or a carbonyl group are volatile and emit a fragrance upon evaporation, and it is presumed that the volatilized fragrance compound (i.e., gaseous fragrance compound) acts on the adhesive to increase its adhesive strength.

[0041] The substrate 3 may have an embodiment that does not include the film layer 31, in which case the fragrance compound of the nonwoven fabric layer 33 comes into direct contact with the adhesive of the adhesive layer 5. In such a case, in addition to the gaseous fragrance compound coming into contact with the adhesive as described above, the liquid or solid fragrance compound can come into contact with the adhesive, and this contact can enhance the adhesive strength of the adhesive.

[0042] (fragrance compound) The fragrance compound is contained in the base material 3, for example, by being impregnated into the nonwoven fabric layer 33. The fragrance compound has a terpene structure and / or a carbonyl group.

[0043] Terpene structure is a general term for structures having isoprene (carbon number 5) as a structural unit, and is also called terpene skeleton. Examples of terpene structures include monoterpene structures (carbon number 10) consisting of two isoprene structural units, sesquiterpene structures (carbon number 15) consisting of three isoprene structural units, and diterpene structures (carbon number 20) consisting of four isoprene structural units. Among these, monoterpene structures and sesquiterpene structures are preferred. When the fragrance compound has a monoterpene structure or a sesquiterpene structure as a terpene structure, the adhesive strength of the adhesive can be further enhanced. The fragrance compound having a terpene structure can have one of the above structures alone in the molecule, but may have two or more kinds.

[0044] Examples of fragrance compounds having a terpene structure include piperitone (having a monoterpene structure and a ketone group), menthone (having a monoterpene structure and a ketone group), linalool (having a monoterpene structure and an alcoholic hydroxyl group), menthol (having a monoterpene structure and an alcoholic hydroxyl group), β-caryophyllene (having a sesquiterpene structure), dihydromyrcenol (having a monoterpene structure and an alcoholic hydroxyl group), 1,8-cineole (having a monoterpene structure and an ether group (more specifically, a cyclic ether structure)), and pulegone (having a monoterpene structure and a ketone group). , menthofuran (having a monoterpene structure), p-menthane-3,8-diol (having a monoterpene structure and an alcoholic hydroxyl group), α-damascone (having a monoterpene structure and a ketone group), isopulegol (having a monoterpene structure and an alcoholic hydroxyl group), α-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), β-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), γ-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), δ-terpineol (having a monoterpene structure and an alcoholic hydroxyl group) are preferred. By selecting these compounds as the fragrance compound having a terpene structure, the adhesive strength of the adhesive can be further enhanced. The fragrance compound having a terpene structure can be used alone or as a mixture of two or more kinds.

[0045] The carbonyl group is a general term for functional groups containing a functional group represented by -C(=O)-. For example, the carbonyl group is preferably an ester group (-C(=O)O-), a ketone group (-C(=O)-), or an aldehyde group (-C(=O)H). When the fragrance compound has an ester group, a ketone group, or an aldehyde group as a carbonyl group, the adhesive strength of the adhesive can be further enhanced. The fragrance compound containing a carbonyl group can have one type of the above groups alone in the molecule, but may have two or more types.

[0046] As the fragrance compound having a carbonyl group, for example, piperitone (having a monoterpene structure and a ketone group), menthone (having a monoterpene structure and a ketone group), pulegone (having a monoterpene structure and a ketone group), allyl hexanoate (having a carboxylic acid ester), α-damascone (having a monoterpene structure and a ketone group), and p-anisaldehyde (having an aldehyde group) are preferable. By selecting these compounds as the fragrance compound having a carbonyl group, the adhesive strength of the adhesive can be further enhanced. The fragrance compound having a carbonyl group can be used alone or as a mixture of two or more kinds.

[0047] As described above, the fragrance compounds having a terpene structure and / or a carbonyl group include piperitone (having a monoterpene structure and a ketone group), menthone (having a monoterpene structure and a ketone group), linalool (having a monoterpene structure and an alcoholic hydroxyl group), menthol (having a monoterpene structure and an alcoholic hydroxyl group), β-caryophyllene (having a sesquiterpene structure), dihydromyrcenol (having a monoterpene structure and an alcoholic hydroxyl group), 1,8-cineole (having a monoterpene structure and an ether group (more specifically, a cyclic ether structure)), pulegone (having a monoterpene structure and a ketone group), menthofuran (having a monoterpene structure), and menthofuran (having a monoterpene structure). Preferred are terpineol (having a monoterpene structure and an alcoholic hydroxyl group), p-menthane-3,8-diol (having a monoterpene structure and an alcoholic hydroxyl group), allyl hexanoate (having a carboxylic acid ester), α-damascone (having a monoterpene structure and a ketone group), p-anisaldehyde (having an aldehyde group), isopulegol (having a monoterpene structure and an alcoholic hydroxyl group), α-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), β-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), γ-terpineol (having a monoterpene structure and an alcoholic hydroxyl group), and δ-terpineol (having a monoterpene structure and an alcoholic hydroxyl group).

[0048] (Fragrance compound content) The lower limit of the content of the fragrance compound in the base material 3 (here, the impregnation amount of the fragrance compound in the nonwoven fabric layer 33) is 0.7 μg / cm 2 (0.0007mg / cm 2 ) or more is preferable, and 1 μg / cm 2 (0.001mg / cm 2 ) or more is more preferable, and 3 μg / cm 2 (0.003mg / cm 2 ) or more is more preferable, and 5 μg / cm 2 (0.005mg / cm 2 ) or more is particularly preferred, and 25 μg / cm 2 (0.025mg / cm 2 ) or more is most preferable. The upper limit is 2600 μg / cm 2 (2.6 mg / cm 2 ) or less, and 260 μg / cm 2 (0.26mg / cm 2 By setting the content of the fragrance compound within the above range, the adhesive strength of the adhesive can be further increased.

[0049] The nonwoven fabric layer 33 may be impregnated with, in addition to the above-mentioned fragrance compounds, other fragrance compounds, deodorant components, antibacterial components, coolant components, pest repellent components, organic solvents such as ethanol, and the like.

[0050] (Shape of substrate) The shape of the substrate 3 may be a rectangle, such as a rectangle or a square. The size of the substrate 3 is preferably a rectangle having a width of 1.5 to 3.0 cm and a length of 6.0 to 10 cm. The rectangular substrate 3 may have rounded corners, or the tip of the substrate in the longitudinal direction may be cut into a wave shape.

[0051] The area of ​​the substrate 3 is 9 to 30 cm 2 By setting the area of ​​the base material 3 within the above range, the pressure-sensitive adhesive sheet 1 becomes easy to handle.

[0052] In this specification, "area" refers to the area of ​​the region surrounded by the outer edge when viewed in the thickness direction. In the case of the base material 3, it is the area of ​​the region surrounded by the outer edge when the base material 3 is viewed in its thickness direction. In the case of the adhesive layer 5, it is the area of ​​the region surrounded by the outer edge when the adhesive layer 5 is viewed in its thickness direction, which is the area that can be bonded to a textile product.

[0053] (Adhesive layer) The adhesive layer 5 is for adhering the adhesive sheet 1 to a textile product, and is formed of an adhesive. Here, "adhesion" means pressure-sensitive adhesion. The adhesive layer 5 is laminated on the surface of the film layer 31 of the substrate 3 (the surface opposite the nonwoven fabric layer 33). The area of ​​the adhesive layer 5 is 9 to 30 cm. 2 is preferred.

[0054] Examples of the adhesive include acrylic adhesives, rubber adhesives, silicone adhesives, etc. Among these, acrylic adhesives are preferred. When the adhesive is an acrylic adhesive, the adhesive strength can be more reliably enhanced by the fragrance compound. When the adhesive is an acrylic adhesive, the mechanism by which the adhesive strength is enhanced is not clear, but it is presumed that the fragrance compound acts on the crosslinked structure of the acrylic resin contained in the acrylic adhesive so as to enhance the adhesive strength of the acrylic adhesive. The adhesive can be used alone or as a mixture of two or more types.

[0055] The adhesive layer 5 is obtained by applying a coating liquid containing an adhesive onto the film layer 31 of the substrate 3 and drying it.

[0056] The content of the adhesive in the adhesive sheet 1 (here, the amount of the adhesive laminated on the nonwoven fabric layer 33) is 1 to 10 mg / cm 2 is preferred, and 1 to 6 mg / cm 2 More preferably, 2 to 5 mg / cm 2is more preferable. By setting the adhesive content within the above range, the adhesive sheet 1 can be more firmly adhered to the textile product. In addition, since the adhesive sheet 1 contains an appropriate amount of adhesive, the fragrance compound also has an appropriate adhesive strength enhancing effect. The adhesive content is calculated by dividing the amount of adhesive used by the area of ​​the adhesive sheet 1, but when the adhesive layer is composed of an adhesive, it can be regarded as the mass per unit area of ​​the adhesive layer.

[0057] The mass ratio (B / A) of the adhesive content (B) to the fragrance compound content (A) is preferably 0.7 to 500, more preferably 1 to 100, and even more preferably 1.5 to 20. By setting the mass ratio (B / A) of the adhesive content (B) to the fragrance compound content (A) within the above range, the adhesive strength of the adhesive can be further enhanced by the fragrance compound.

[0058] A double-sided adhesive tape in which adhesive layers are formed on both sides of a base sheet by an adhesive may be used as the adhesive layer 5. In this case, one side of the double-sided adhesive tape is adhered to the film layer 31, and the other side is adhered to the release sheet 7.

[0059] The adhesive layer 5 may contain other components such as an ultraviolet absorbing agent, an ultraviolet scattering agent, a gloss agent, a dispersing agent, a pigment, a dye, and the like, in addition to the above-mentioned adhesive.

[0060] <Release sheet> The release sheet 7 is for temporarily (until use) protecting the adhesive layer 5, and is releasably attached to the surface (the surface opposite the substrate 3) of the adhesive layer 5. Examples of the release sheet 7 include sheets made of paper, film, and the like.

[0061] By peeling the release sheet 7 from the adhesive layer 5, the exposed adhesive layer 5 can be adhered to a textile product.

[0062] (Preparation of adhesive sheet) The adhesive sheet 1 of the present embodiment is obtained, for example, by laminating a nonwoven fabric layer 33 on one side of a film layer 31 by thermal adhesion, applying a coating liquid containing an adhesive to the other side, and drying the laminate to obtain a substrate 3, and then impregnating the nonwoven fabric layer 33 of the substrate 3 with a fragrance compound. The nonwoven fabric layer 33 containing the fragrance compound in advance may be thermally bonded to the film layer 31, but when using a fragrance compound that is sensitive to heat, it is preferable to impregnate the nonwoven fabric layer 33 with the fragrance compound after obtaining the substrate 3. As a method for impregnating the nonwoven fabric layer 33 with the fragrance compound, a conventionally known method can be appropriately adopted, and an example of such a method is impregnating the nonwoven fabric layer 33 with the fragrance compound. As a method for impregnating the nonwoven fabric layer 33 with the fragrance compound, for example, when the surface area of ​​the nonwoven fabric layer 33 is large, the fragrance compound may be impregnated (supported) by a liquid dispensing method or a coating method, and when the surface area of ​​the nonwoven fabric layer 33 is small, the base material 3 may be placed in a sealed container, and the fragrance compound, if necessary together with a solvent, may be added thereto and sprayed or dropped to impregnate (penetrate) the nonwoven fabric layer 33. Also usable are a method of immersing the base material 3 in a liquid containing the fragrance compound for an appropriate period of time, or a method of mixing a base material 3 containing a high concentration of the fragrance compound in the nonwoven fabric layer 33 with an untreated base material 3 in a sealed container and leaving it for an appropriate period of time to average the concentration of the fragrance compound throughout the nonwoven fabric layer 33, and the like.

[0063] According to the adhesive sheet 1 of this embodiment, when a fragrance compound having a terpene structure and / or a carbonyl group comes into contact with the adhesive in the adhesive layer 5, it is surprisingly possible to enhance the adhesive strength of the adhesive. This makes the adhesive sheet 1 difficult to peel off when adhered to a textile product. Although the mechanism by which the adhesive strength of the adhesive is enhanced by contact between the fragrance compound and the adhesive is not clear, it is presumed that the terpene structure and / or the carbonyl group of the fragrance compound exerts some action on the adhesive, enhancing its adhesive strength.

[0064] [Method to increase adhesive strength] The adhesive strength enhancing method of the present embodiment is a method for enhancing the adhesive strength of an adhesive, which comprises contacting the adhesive with a fragrance compound having a terpene structure and / or a carbonyl group.

[0065] According to the method for enhancing adhesive strength of the present embodiment, the adhesive strength of the adhesive can be enhanced in the same manner as described above.

[0066] The adhesive may be the same as the adhesive described above.

[0067] As the fragrance compound, the same fragrance compounds as those mentioned above can be used to achieve the above-mentioned effects.

[0068] The adhesive force enhancing method of the present embodiment can be used for various applications, for example, the adhesive sheet 1 of the present embodiment described above, but the applications are not particularly limited. EXAMPLES

[0069] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0070] <Test Example 1> [Preparation of a laminate having an adhesive layer laminated on a substrate] A 10 μm thick barrier film layer made of polyethylene terephthalate is attached to one side of the film, and a nonwoven fabric layer made of polypropylene fiber and pulp fiber (basis weight: 70 g / m 2 ) was laminated on the other side of the barrier film, and an acrylic adhesive was applied to the other side of the barrier film to adjust the adhesive content to 3.0 mg / cm 2 The adhesive layer was laminated so that the adhesive layer had a release sheet laminated thereon, to obtain a rectangular laminate with a width of 2.0 cm and a length of 7.9 cm (area: 15.8 cm). 2 ) was obtained.

[0071] [Preparation of Pressure-Sensitive Adhesive Sheets of Examples 1 to 23 and Comparative Examples 1 to 6] A through hole (test hole) with a diameter of 0.8 mm was formed from the center of one short side (length 2.0 cm) of the laminate at a position 1 cm away in the longitudinal direction toward the other short side. Next, each fragrance compound shown in Tables 1 to 8 was dissolved in ethanol to prepare a fragrance compound-containing solution, and 100 μL of the fragrance compound-containing solution was dispensed by dropping it evenly into multiple locations on the nonwoven fabric layer of the laminate. In this way, pressure-sensitive adhesive sheets of Examples 1 to 23 and Comparative Examples 1 to 6 were obtained (area: 15.8 cm 2 ).

[0072] [Preparation of standard adhesive sheet] A reference adhesive sheet (area: 15.8 cm2) was obtained in the same manner as above, except that ethanol was used as a blank instead of the fragrance compound-containing solution, without dissolving the fragrance compound in ethanol. 2 ).

[0073] [Evaluation of adhesive strength enhancement effect] The adhesive sheets of Examples 1 to 23 and Comparative Examples 1 to 6 were placed in a glass screw bottle (volume 50 mL), covered, and left to stand for 1 hour. After standing, each adhesive sheet was taken out of the glass bottle, the release sheet was peeled off, and the adhesive layer was adhered to a test mount (coated cardboard coated with acrylic resin: thickness 2 mm). 24 hours after adhesion, the side of the adhesive sheet in the longitudinal direction where the test hole was formed was peeled off by 1 cm from the edge, and a metal paper clip was passed through the test hole. Next, the paper clip was set in a push-pull gauge (product name: mechanical force gauge PS / PSS series, manufactured by Imada Co., Ltd.), and the load F1 (N) was measured when the paper clip was pulled up 12 cm together with the adhesive sheet at a pulling speed of 0.45 cm / sec.

[0074] The load F0 (N) of the reference pressure-sensitive adhesive sheet was also measured in the same manner as above.

[0075] The increase rate of the load F1 of the adhesive sheets of Examples 1 to 23 and Comparative Examples 1 to 6 relative to the load F0 of the reference adhesive sheet was calculated using the following formula (1), and the calculated result was defined as the adhesive strength increase rate R (%) after 24 hours. Adhesion increase rate after 24 hours R(%) = F1 / F0 × 100 (1)

[0076] The adhesive strength increase rate R after 24 hours obtained was evaluated according to the following criteria. (Judgment criteria) A: Adhesive strength increase rate R is 110% or more (highly effective in increasing adhesive strength) B: Adhesive strength increase rate R is 105% or more but less than 110% (high adhesive strength increase effect) C: Adhesive strength increase rate R is less than 105% (adhesive strength increase effect is low or not recognized)

[0077] [Table 1]

[0078] [Table 2]

[0079] [Table 3]

[0080] [Table 4]

[0081] [Table 5]

[0082] [Table 6]

[0083] [Table 7]

[0084] [Table 8]

[0085] As shown in Tables 1 to 6, the pressure-sensitive adhesive sheets of Examples 1 to 23, which used a fragrance compound having a terpene structure and / or a carbonyl group, were shown to have an excellent adhesive strength enhancing effect. 2 Specifically, if it is greater than 0.7 μg / cm 2 It was shown that when this is the case, the adhesive strength enhancing effect of the adhesive tends to be further enhanced.

[0086] In contrast, as shown in Tables 7 and 8, the pressure-sensitive adhesive sheets of Comparative Examples 1, 2, 5 and 6, which used fragrance compounds having neither a terpene structure nor a carbonyl group, were shown to be inferior in the adhesive strength enhancing effect of the pressure-sensitive adhesive.

[0087] From a comparison of Examples 9 to 11 and Comparative Example 3, it was found that the content of the fragrance compound was 0.7 to 2600 μg / cm 2 More preferably, it is 6.3 to 2600 μg / cm 2 In addition, from a comparison of Examples 12 to 15 and Comparative Example 4, it was shown that when the content of the fragrance compound is 0.7 to 2600 μg / cm 2 More preferably, it is 6.3 to 2600 μg / cm 2 When Examples 2 to 3, 5 to 6, and 9 to 18 are also evaluated comprehensively, it was shown that when the content of the fragrance compound is 0.7 to 2600 μg / cm 2 In the case where the content of the fragrance compound is 6.3 to 2600 μg / cm, the adhesive strength enhancing effect of the adhesive is further enhanced. 2 It can be seen that the adhesive strength enhancing effect of the adhesive tends to be further enhanced when the fragrance compounds of Examples 1, 4, 7, 8, and 19 to 23 are used in addition to those of Examples 2 to 3, 5 to 6, and 9 to 18. It is also reasonably assumed that the same tendency is observed when the fragrance compounds of Examples 1, 4, 7, 8, and 19 to 23 are used.

[0088] <Test Example 2> [Preparation of a laminate having an adhesive layer laminated on a substrate] A laminate similar to that of Test Example 1 was obtained in the same manner as in Test Example 1. Specifically, a nonwoven fabric layer (basis weight: 70 g / m2) made of polypropylene fibers and pulp fibers was laminated on one side of a barrier film layer having a thickness of 10 μm and made of polyethylene terephthalate. 2 ) was laminated on the other side of the barrier film, and an acrylic adhesive was applied to the other side of the barrier film to adjust the adhesive content to 3.0 mg / cm 2 The adhesive layer was laminated so that the adhesive layer had a release sheet laminated thereon, to obtain a rectangular laminate with a width of 2.0 cm and a length of 7.9 cm (area: 15.8 cm). 2 ) was obtained.

[0089] [Preparation of Adhesive Sheets of Examples 24 to 32] A through hole (test hole) with a diameter of 0.8 mm was formed from the center of one short side (length 9.0 cm) of the laminate at a position 1 cm away in the longitudinal direction toward the other short side. Next, each fragrance compound shown in Tables 9 to 10 was dissolved in ethanol to prepare a fragrance compound-containing solution, and 100 μL of the fragrance compound-containing solution was dispensed by dropping it evenly into multiple locations on the nonwoven fabric layer of the laminate. In this way, pressure-sensitive adhesive sheets of Examples 24 to 32 (area: 15.8 cm 2 ).

[0090] [Preparation of standard adhesive sheet] A reference adhesive sheet (area: 15.8 cm2) was obtained in the same manner as above, except that ethanol was used as a blank instead of the fragrance compound-containing solution, without dissolving the fragrance compound in ethanol. 2 ).

[0091] [Evaluation of adhesive strength enhancement effect] The adhesive strength increase rate R (%) after 24 hours was obtained in the same manner as in Test Example 1, except that the adhesive layer was adhered to a nonwoven fabric sheet for masks (160 mm horizontal (width) × 90 mm vertical (length), material: polypropylene, manufactured by Maruki Co., Ltd.) instead of the test mount, using the adhesive sheets of Examples 24 to 32. Specifically, the adhesive sheets of Examples 24 to 32 were placed in a glass screw bottle (volume 50 mL), covered, and left to stand for 1 hour. After standing, each adhesive sheet was removed from the glass bottle, the release sheet was peeled off, and the adhesive layer was adhered to the nonwoven fabric sheet for masks. After 24 hours had passed since adhesion, the side of the adhesive sheet in the longitudinal direction where the test hole was formed was peeled off by 1 cm from the edge, and a metal paper clip was passed through the test hole. Next, the paper clip was set in a push-pull gauge (product name: Mechanical Force Gauge PS / PSS Series, manufactured by Imada Co., Ltd.), and the load F1 (N) was measured when the paper clip together with the adhesive sheet was pulled up 12 cm at a pulling speed of 0.45 cm / sec.

[0092] The load F0 (N) of the reference pressure-sensitive adhesive sheet was also measured in the same manner as above.

[0093] The increase rate of the load F1 of the adhesive sheets of Examples 24 to 32 relative to the load F0 of the reference adhesive sheet was calculated using the following formula (1), and the calculated result was defined as the adhesive strength increase rate R (%) after 24 hours. Adhesion increase rate after 24 hours R(%) = F1 / F0 × 100 (1)

[0094] The adhesive strength increase rate R after 24 hours obtained was evaluated according to the following criteria. (Judgment criteria) A: Adhesive strength increase rate R is 110% or more (highly effective in increasing adhesive strength) B: Adhesive strength increase rate R is 105% or more but less than 110% (high adhesive strength increase effect) C: Adhesive strength increase rate R is less than 105% (adhesive strength increase effect is low or not recognized)

[0095] [Table 9]

[0096] [Table 10]

[0097] As shown in Tables 9 to 10, the adhesive sheets of Examples 24 to 32, which used fragrance compounds having a terpene structure and / or a carbonyl group, were shown to have excellent adhesive strength enhancing effects even when used with nonwoven fabric for masks, similar to Test Example 1, in which the adhesive layer was adhered to a test mount.

[0098] <Test Example 3> [Preparation of a laminate having an adhesive layer laminated on a substrate] A nonwoven surgical tape with an adhesive layer containing an adhesive laminated on one side of the substrate (25 mm x 9 m, substrate: nonwoven fabric, adhesive: acrylic adhesive, manufactured by Yoc Co., Ltd., adhesive content: 4.4 mg / cm 2 ) was cut and a release sheet was laminated onto the adhesive layer to obtain a rectangular laminate (area: 15.8 cm) with a width of 2.0 cm and a length of 7.9 cm. 2 The adhesive content was measured by extracting the adhesive from a nonwoven surgical tape cut to a specified area with an organic solvent, distilling off the organic solvent from the extract, measuring the mass of the residue, and dividing the mass of the residue by the specified area.

[0099] [Preparation of Adhesive Sheets of Examples 33 to 41] A through hole (test hole) with a diameter of 0.8 mm was formed from the center of one short side (length 2.0 cm) of the laminate at a position 1 cm away in the longitudinal direction toward the other short side. Next, each fragrance compound shown in Tables 11 and 12 was dissolved in ethanol to prepare a fragrance compound-containing solution, and 100 μL of the fragrance compound-containing solution was dispensed by dropping it evenly into multiple locations on the nonwoven fabric layer of the laminate. In this way, pressure-sensitive adhesive sheets of Examples 33 to 41 (area: 15.8 cm 2 ).

[0100] [Preparation of standard adhesive sheet] A reference adhesive sheet (area: 15.8 cm2) was obtained in the same manner as above, except that ethanol was used as a blank instead of the fragrance compound-containing solution, without dissolving the fragrance compound in ethanol. 2 ).

[0101] [Evaluation of adhesive strength enhancement effect] Using the adhesive sheets of Examples 33 to 41, the adhesive strength increase rate R (%) after 24 hours was obtained in the same manner as in Test Example 1. Specifically, the adhesive sheets of Examples 33 to 41 were placed in a glass screw bottle (volume 50 mL), and the bottle was closed and left to stand for 1 hour. After standing, each adhesive sheet was taken out of the glass bottle, the release sheet was peeled off, and the adhesive layer was adhered to a test mount (coated cardboard coated with acrylic resin: thickness 2 mm). After 24 hours had passed from adhesion, the side of the adhesive sheet in the longitudinal direction where the test hole was formed was peeled off by 1 cm from the edge, and a metal paper clip was passed through the test hole. Next, the paper clip was set in a push-pull gauge (product name: mechanical force gauge PS / PSS series, manufactured by Imada Co., Ltd.), and the load F1 (N) was measured when the paper clip was pulled up 12 cm together with the adhesive sheet at a pulling speed of 0.45 cm / sec.

[0102] The load F0 (N) of the reference pressure-sensitive adhesive sheet was also measured in the same manner as above.

[0103] The increase rate of the load F1 of the adhesive sheets of Examples 33 to 41 relative to the load F0 of the reference adhesive sheet was calculated using the following formula (1), and the calculated result was defined as the adhesive strength increase rate R (%) after 24 hours. Adhesion increase rate after 24 hours R(%) = F1 / F0 × 100 (1)

[0104] The adhesive strength increase rate R after 24 hours obtained was evaluated according to the following criteria. (Judgment criteria) A: Adhesive strength increase rate R is 110% or more (highly effective in increasing adhesive strength) B: Adhesive strength increase rate R is 105% or more but less than 110% (high adhesive strength increase effect) C: Adhesive strength increase rate R is less than 105% (adhesive strength increase effect is low or not recognized)

[0105] [Table 11]

[0106] [Table 12]

[0107] As shown in Tables 11 and 12, the adhesive sheets of Examples 33 to 41, which used fragrance compounds having a terpene structure and / or a carbonyl group, were shown to have excellent adhesive strength enhancing effects, similar to Test Example 1, which had a barrier film layer, even when the substrate did not have a barrier film layer (PET layer). [Industrial Applicability]

[0108] The pressure-sensitive adhesive sheet and the method for enhancing adhesive force of the present invention can be used for textile products, particularly masks. [Explanation of symbols]

[0109] 1 Adhesive sheet 3 Base material 31 Film Layer 33 Non-woven layer 5 Adhesive layer 7 Release sheet

Claims

1. A substrate; an adhesive layer including an adhesive laminated on the substrate; A pressure-sensitive adhesive sheet that is adhered to a textile product by the pressure-sensitive adhesive layer, The substrate is a pressure-sensitive adhesive sheet containing a fragrance compound having a terpene structure and / or a carbonyl group.

2. The pressure-sensitive adhesive sheet according to claim 1 , wherein the fragrance compound has a monoterpene structure and / or a sesquiterpene structure as the terpene structure.

3. The pressure-sensitive adhesive sheet according to claim 1 , wherein the fragrance compound has, as the carbonyl group, one or more groups selected from the group consisting of an ester group, a ketone group, and an aldehyde group.

4. The pressure-sensitive adhesive sheet according to claim 1, wherein the fragrance compound is one or a mixture of two or more selected from the group consisting of piperitone, menthone, linalool, menthol, β-caryophyllene, dihydromyrcenol, 1,8-cineole, pulegone, menthofuran, p-menthane-3,8-diol, allyl hexanoate, α-damascone, p-anisaldehyde, isopulegol, α-terpineol, β-terpineol, γ-terpineol, and δ-terpineol.

5. The content of the fragrance compound is 0.7 μg / cm ２ The pressure-sensitive adhesive sheet according to claim 1 .

6. The pressure-sensitive adhesive sheet according to claim 1 , wherein the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive.

7. The content of the adhesive is 1 to 10 mg / cm ２ The pressure-sensitive adhesive sheet according to claim 1 .

8. 2. The pressure-sensitive adhesive sheet according to claim 1, wherein a mass ratio (B / A) of the content (B) of the pressure-sensitive adhesive to the content (A) of the fragrance compound is 0.7 to 500.

9. The substrate is A film layer; a nonwoven fabric layer laminated on one surface of the film layer; Including, The adhesive layer is laminated on the other surface of the film layer, The pressure-sensitive adhesive sheet according to claim 1 , wherein the fragrance compound is contained in the nonwoven fabric layer.

10. The pressure-sensitive adhesive sheet according to any one of claims 1 to 9, wherein the textile product is a mask.

11. A method for enhancing the adhesive strength of an adhesive, comprising the steps of: A method for enhancing adhesive strength comprising contacting a fragrance compound having a terpene structure and / or a carbonyl group with the adhesive.

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