Mask

Abstract

To provide a mask which is excellent in adhesion stability and re-adhesion performance of an adhesive layer to a cheek and also suppresses the occurrence of pain in removing the mask and the occurrence of stickiness after removal.SOLUTION: The mask comprises a base fabric for mask, and an adhesive layer disposed on the inner surface of the base fabric. The adhesive layer contains an adhesive base, a terpene-based resin (A), a hydrogenated rosin glycerol ester (B), and a liquid paraffin (C). A content of the hydrogenated rosin glycerin ester (B) is in a range of 8 to 22 mass% with respect to the whole adhesive layer, a mass ratio of a content of the terpene-based resin (A) to a content of the hydrogenated rosin glycerol ester (B) is in a range of A / B=0.3-2.0, the sum of contents of the terpene-based resin (A) and the hydrogenated rosin glycerol ester (B) is in a range of 20 to 35 mass% with respect to the whole adhesive layer, and a mass ratio of a content of the liquid paraffin (C) to the sum of contents of the terpene-based resin (A) and the hydrogenated rosin glycerol ester (B) is in a range of C / (A+B)=1.0-3.0.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to masks, and more particularly to masks without ear straps. [Background technology]

[0002] 2. Description of the Related Art Conventionally, masks that do not have ear loops and are used by attaching an adhesive part to the cheek have been known as masks for preventing the intrusion of dust, dirt, house dust such as mites, pollen, mold, bacteria, viruses, and the like.

[0003] For example, Japanese Utility Model Laid-Open Publication No. 7-386 (Patent Document 1), Japanese Patent Laid-Open Publication No. 2007-20983 (Patent Document 2), Japanese Patent Laid-Open Publication No. 2014-8367 (Patent Document 3), and Japanese Utility Model Registration No. 3231212 (Patent Document 4) disclose a mask having adhesive parts at both ends and four corners of the mask body, and also state that the mask can be worn on the face by sticking the adhesive parts to the cheeks. In addition, Japanese Patent Laid-Open Publication No. 11-128378 (Patent Document 5) and Japanese Patent Laid-Open Publication No. 2011-10903 (Patent Document 6) disclose a mask having an adhesive part formed on the periphery of the mask body, and also state that the mask can be worn on the face without any gaps between the mask and the face by adhering the adhesive parts to the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 7-386 [Patent Document 2] JP 2007-20983 A [Patent Document 3] JP 2014-8367 A [Patent Document 4] Utility Model Registration No. 3231212 [Patent Document 5] Japanese Patent Application Publication No. 11-128378 [Patent Document 6] JP 2011-10903 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional masks, which are worn on the face by sticking the adhesive part to the cheek or other part, do not necessarily have sufficient adhesion stability or re-attachability between the adhesive part and the cheek. In addition, there are cases where the mask causes pain when removed or leaves a sticky feeling after removal.

[0006] The present invention has been made in consideration of the problems associated with the above-mentioned conventional technology, and aims to provide a mask which has excellent adhesion stability and re-adhesion of the adhesive layer to the cheeks, and which further reduces the occurrence of pain when removing the mask and stickiness after removal. [Means for solving the problem]

[0007] As a result of extensive research to achieve the above-mentioned object, the inventors have discovered that by blending (A) a terpene resin, (B) hydrogenated rosin glycerin ester, and (C) liquid paraffin in specific ratios, an adhesive layer is formed which is free of pain when removed and stickiness after removal, and which has excellent adhesion stability and re-adhesion, and have thus completed the present invention.

[0008] That is, the present invention provides the following aspects.

[0009] [1] A mask comprising a mask base fabric and an adhesive layer provided on the inner surface of the base fabric, the adhesive layer containing an adhesive base, (A) a terpene resin, (B) a hydrogenated rosin glycerin ester, and (C) liquid paraffin, the content of the (B) hydrogenated rosin glycerin ester being within the range of 8 to 22% by mass of the entire adhesive layer, the mass ratio of the content of the (A) terpene resin to the content of the (B) hydrogenated rosin glycerin ester being within the range of A / B = 0.3 to 2.0, the total content of the (A) terpene resin and the (B) hydrogenated rosin glycerin ester being within the range of 20 to 35% by mass of the entire adhesive layer, and the mass ratio of the content of the (C) liquid paraffin to the total content of the (A) terpene resin and the (B) hydrogenated rosin glycerin ester being within the range of C / (A + B) = 1.0 to 3.0.

[0010] [2] The mask described in [1], wherein the adhesive layer is provided on the inner surface of both the left and right ends of the base fabric.

[0011] [3] The mask described in [1] or [2], wherein the pressure-sensitive adhesive layer has a vertical length in the range of 2 to 10 cm and a width in the range of 0.5 to 3 cm.

[0012] [4] The mask according to any one of [1] to [3], wherein the adhesive base is at least one selected from the group consisting of rubber-based adhesive bases, acrylic-based adhesive bases, polyurethane-based adhesive bases, silicone-based adhesive bases, and hydrogels made of aqueous polymers. Effect of the Invention

[0013] According to the present invention, it is possible to obtain a mask which has excellent adhesion stability and re-adhesion of the adhesive layer to the cheek area, and which further reduces the occurrence of pain when removing the mask and stickiness after removal. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing a preferred embodiment of a mask of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing another preferred embodiment of the mask of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described in detail below based on preferred embodiments thereof.

[0016] The mask of the present invention comprises a mask base fabric and an adhesive layer provided on the inner surface of the base fabric, the adhesive layer containing an adhesive base, (A) a terpene resin, (B) a hydrogenated rosin glycerin ester, and (C) liquid paraffin.

[0017] The adhesive base used in the present invention is not particularly limited, and examples thereof include rubber-based adhesive bases, acrylic-based adhesive bases, polyurethane-based adhesive bases, silicone-based adhesive bases, hydrogels made of aqueous polymers, etc. These adhesive bases may be used alone or in combination of two or more. Among these adhesive bases, rubber-based adhesive bases, acrylic-based adhesive bases, polyurethane-based adhesive bases, and silicone-based adhesive bases are preferred, and rubber-based adhesive bases are more preferred, from the viewpoints that the adhesive layer can be spread without bleeding to the back side of the base fabric and that the anchoring property between the base fabric and the adhesive layer is maintained.

[0018] Examples of the rubber-based adhesive base include natural rubber and synthetic rubber. Examples of the synthetic rubber include polyisoprene, polyisobutylene, polybutadiene, polybutene, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, and styrene-isoprene rubber. These rubber-based adhesive bases may be used alone or in combination of two or more. Among these rubber-based adhesive bases, styrene-isoprene-styrene block copolymer, polyisobutylene, and mixtures thereof are preferred from the viewpoints of excellent adhesion stability and re-adhesion of the adhesive layer to the cheek, and further suppression of pain during removal and stickiness after removal. Specific examples of styrene-isoprene-styrene block copolymers include Quintac (registered trademark) 3570C (trade name, manufactured by Zeon Corporation), SIS5002, SIS5229, SIS5505, SIS5505P (trade names, manufactured by JSR Corporation), and SIBSTAR (registered trademark) T102 (trade name, manufactured by Kaneka Corporation). Polyisobutylene also includes so-called butyl rubber (isobutylene-isoprene rubber), and a specific example thereof is Oppanol (registered trademark). ) N50, N80, N100, N150, B11, B12, B50, B80, B100, B120, B150, B220 (trade names, manufactured by BASF), JSR (registered trademark) Butyl 065, 268, 365 (trade names, manufactured by JSR Corporation), X_Butyl (registered trademark) RB100, 101-3, 301, 402 (trade names, manufactured by ARLANXEO), Exxon (registered trademark) Butyl 065, 065S, 068, 068S, 268, 268S, 365, 365S (trade names, manufactured by Exxon Mobile), Butyl 065, 268, 365 (trade names, manufactured by Japan Butyl Co., Ltd.), and the like.

[0019] Examples of the acrylic adhesive base include homopolymers and copolymers of (meth)acrylic monomers such as (meth)acrylic acid, 2-ethylhexyl (meth)acrylate, methyl (meth)acrylate, butyl (meth)acrylate, and hydroxyethyl (meth)acrylate, and more specifically, DURO-TAK 87-2097, 87-2194, 87-2196, 87-2287, 87-2516, 87-2852, 87-4287, and 87-900A (trade names, manufactured by Henkel Corporation), as well as MAS811 and MAS683 (trade names, manufactured by Cosmedi Pharmaceutical Co., Ltd.). These acrylic adhesive bases may be used alone or in combination of two or more kinds.

[0020] Examples of the polyurethane adhesive base include aliphatic polyurethane adhesive bases and aromatic polyurethane adhesive bases. These polyurethane adhesive bases may be used alone or in combination of two or more.

[0021] Examples of the silicone adhesive base include adhesive bases mainly composed of silicone rubber such as polydimethylsiloxane, polymethylvinylsiloxane, and polymethylphenylsiloxane, and more specific examples include BIO-PSA X7-4201, BIO-PSA 7-4102, BIO-PSA 7-4202, BIO-PSA 7-4302, BIO-PSA Q7-4501, 360Medical fluid 1000CS, and MDX4-4210 (trade name, manufactured by DuPont-Toray Specialty Materials Co., Ltd.). These silicone adhesive bases may be used alone or in combination of two or more.

[0022] Examples of the hydrogels made of aqueous polymers include those containing, as the main component, gelatin, carrageenan, hydroxyethyl cellulose, polyacrylic acid, neutralized polyacrylic acid, etc. These hydrogels may be used alone or in combination of two or more.

[0023] The content of such adhesive base is preferably 15 to 35 mass %, more preferably 20 to 30 mass %, and even more preferably 26 to 30 mass %, based on the total mass of the adhesive layer. If the content of adhesive base is less than the lower limit, the cohesive strength of the adhesive layer tends to decrease, whereas if it exceeds the upper limit, the adhesive strength of the adhesive layer tends to decrease.

[0024] The hydrogenated rosin glycerin ester (B) used in the present invention is a solid resin obtained by hydrogenating rosin and esterifying it with glycerin, and acts as a tackifier.

[0025] In the present invention, the content of the hydrogenated rosin glycerin ester (B) is required to be within the range of 8 to 22% by mass with respect to the entire pressure-sensitive adhesive layer. If the content of component (B) is less than the lower limit, pain occurs when removing the mask, and stickiness occurs after removal. On the other hand, if the content of component (B) exceeds the upper limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer are reduced. In addition, from the viewpoint of reliably suppressing the occurrence of pain when removing the mask and the occurrence of stickiness after removal, the lower limit of the content of component (B) is preferably 11% by mass or more, and more preferably 13.5% by mass or more. On the other hand, from the viewpoint of improving the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer, the upper limit of the content of component (B) is preferably 19% by mass or less, and more preferably 15% by mass or less.

[0026] The terpene resin (A) used in the present invention acts as a tackifier. Examples of such terpene resins (A) include terpene resins (terpene homopolymers), aromatic modified terpene resins, terpene phenol resins, and hydrogenated terpene phenol resins. Among the terpene resins (A), terpene resins are preferred from the viewpoints of excellent adhesion stability and re-adhesion of the adhesive layer to the cheek, and further suppression of pain during removal and stickiness after removal.

[0027] In the present invention, the mass ratio of the content of the terpene resin (A) to the content of the hydrogenated rosin glycerin ester (B) must be within the range of A / B=0.3 to 2.0. When the mass ratio [A / B] of the component (A) to the component (B) is less than the lower limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer are reduced. On the other hand, when the mass ratio [A / B] of the component (A) to the component (B) exceeds the upper limit, pain occurs when removing the mask and stickiness occurs after removal. From the viewpoint of improving the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer, the lower limit of the mass ratio [A / B] is preferably A / B=0.42 or more, and more preferably A / B=0.70 or more. On the other hand, from the viewpoint of reliably suppressing the occurrence of pain when removing the mask and the occurrence of stickiness after removal, the upper limit of the mass ratio [A / B] is preferably A / B=1.45 or less, and more preferably A / B=1.00 or less.

[0028] In the present invention, the total content of the terpene resin (A) and the hydrogenated rosin glycerin ester (B) is required to be within the range of 20 to 35% by mass based on the entire pressure-sensitive adhesive layer. If the total content of components (A) and (B) is less than the lower limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer are reduced. On the other hand, if the total content of components (A) and (B) exceeds the upper limit, pain occurs when removing the mask, and stickiness occurs after removal. From the viewpoint of improving the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer, the lower limit of the total content of components (A) and (B) is preferably 21% by mass or more, and more preferably 24% by mass or more. On the other hand, from the viewpoint of reliably suppressing the occurrence of pain when removing the mask and the occurrence of stickiness after removal, the upper limit of the total content of components (A) and (B) is preferably 34% by mass or less, and more preferably 30% by mass or less.

[0029] Furthermore, the liquid paraffin (C) used in the present invention acts as a plasticizer. The liquid paraffin (C) has a viscosity of 34.5 to 150 mm at 40° C. from the viewpoint of improving the adhesion stability and re-adhesion of the pressure-sensitive adhesive layer and reliably suppressing the occurrence of pain when removing the mask and the occurrence of stickiness after removal. 2 Liquid paraffin having a molecular weight of 1000 to 15000 is preferred.

[0030] In the present invention, the mass ratio of the content of the liquid paraffin (C) to the total content of the terpene resin (A) and the hydrogenated rosin glycerin ester (B) must be in the range of C / (A+B)=1.0 to 3.0. If the mass ratio [C / (A+B)] of the component (C) to the total content of the components (A) and (B) is less than the lower limit, pain occurs when removing the mask, and stickiness occurs after removal. On the other hand, if the mass ratio [C / (A+B)] of the component (C) to the total content of the components (A) and (B) exceeds the upper limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer are reduced. In addition, from the viewpoint of reliably suppressing the occurrence of pain when removing the mask and the occurrence of stickiness after removal, the lower limit of the mass ratio [C / (A+B)] is preferably C / (A+B)=1.2 or more, more preferably C / (A+B)=1.5 or more. On the other hand, from the viewpoint of improving the adhesion stability and re-adhesion of the pressure-sensitive adhesive layer, the upper limit of the mass ratio [C / (A+B)] is preferably C / (A+B)=2.5 or less, and more preferably C / (A+B)=2.0 or less.

[0031] Furthermore, in the present invention, such a pressure-sensitive adhesive layer may further contain various additives such as a tackifying resin other than the terpene resin and the hydrogenated rosin glycerin ester (e.g., an alicyclic saturated hydrocarbon resin), a solubilizing agent, a moisturizing agent, a stabilizer, an inorganic powder, a colorant, a flavoring agent, a pH adjuster, etc., within a range that does not impair the effects of the present invention.

[0032] In the mask of the present invention, such an adhesive layer is provided on the inner surface of the mask base fabric. In addition, in the mask of the present invention, for example, as shown in Figures 1 and 2, it is preferable that the adhesive layer 1 is provided on the inner surface of both left and right ends of the mask base fabric 2.

[0033] In the mask of the present invention, the size of the adhesive layer is preferably in the range of 2 to 10 cm in the vertical direction, more preferably in the range of 3 to 9 cm, and particularly preferably in the range of 4 to 8 cm, and preferably in the range of 0.5 to 3 cm in the width, more preferably in the range of 0.8 to 2.5 cm, and particularly preferably in the range of 1 to 2 cm. If the vertical length or width of the adhesive layer is less than the lower limit, sufficient adhesive strength is not obtained, and the mask tends to easily fall off the face during use, while if it exceeds the upper limit, the size of the mask base fabric becomes large, and pain tends to occur when removing the mask. In the present invention, the vertical length of the adhesive layer means the length in the direction parallel to the vertical direction of the mask (the vertical direction of the mask), and the width of the adhesive layer means the length in the direction perpendicular to the vertical direction of the mask (the vertical direction of the mask). For example, in the masks shown in Figures 1 and 2, L is the vertical length of the adhesive layer, and W is the width of the adhesive layer. In addition, when the length of the adhesive layer in the vertical direction is not constant, such as in the mask shown in FIG. 1, the length of the longest part of the adhesive layer in the vertical direction is defined as the length L of the adhesive layer in the vertical direction.

[0034] In the mask of the present invention, the mass of the adhesive layer is not particularly limited as long as it is an amount that can ensure adhesive strength. However, it is preferable that the mass per unit area of ​​the adhesive layer on the attachment surface be 160 to 240 g / m. 2 and preferably in the range of 180 to 220 g / m 2 It is more preferable that the ratio is in the range of 1.

[0035] The mask base fabric is not particularly limited, and a known mask base fabric used for masks to prevent the intrusion of dust, dust, house dust such as mites, pollen, mold, bacteria, viruses, etc. can be adopted. Examples of materials for such mask base fabrics include polyolefins such as polyethylene and polypropylene; polyvinyls such as ethylene-vinyl acetate copolymers, vinyl acetate-vinyl chloride copolymers, and polyvinyl chloride; polyamides; polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; cellulose derivatives; and synthetic resins such as polyurethane. Examples of the form of such mask base fabrics include breathable films and sheets such as porous films and porous sheets; fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics; and laminates thereof. In the mask of the present invention, such base fabrics may be used alone or in a combination of two or more layers. In addition, when two or more layers are used in a combination, base fabrics of the same material may be used in a combination, or base fabrics of different materials may be used in a combination. Furthermore, a structure in which a functional sheet such as a sheet with a built-in virus droplet collection filter is sandwiched between two base fabrics may be formed.

[0036] When the mask base fabric of the present invention is a nonwoven fabric, the basis weight of the nonwoven fabric is preferably 80 to 150 g / m2, from the viewpoint that the adhesive layer can be spread without seeping out to the back side of the base fabric and the anchoring property between the base fabric and the adhesive layer can be maintained. 2 is preferable, and 95 to 125 g / m 2More preferably, the thickness of the nonwoven fabric is 0.50 to 0.70 mm. The strength of the nonwoven fabric at 50% elongation is preferably 1.0 N / 50 mm to 4.0 N / 50 mm in the longitudinal direction of the mask, and preferably 6.5 N / 50 mm to 21.0 N / 50 mm in the transverse direction of the mask. The tensile strength of the nonwoven fabric is preferably 30 N / 50 mm to 60 N / 50 mm in the longitudinal direction of the mask, and preferably 80 N / 50 mm to 180 N / 50 mm in the transverse direction of the mask. The elongation of the nonwoven fabric is preferably 120% to 400% in the longitudinal direction of the mask, and preferably 100% to 160% in the transverse direction of the mask. In the present invention, the longitudinal direction of the mask means the vertical direction of the mask as shown in Figs. 1 and 2, and the transverse direction of the mask means the direction perpendicular to the vertical direction of the mask as shown in Figs. 1 and 2.

[0037] In addition, in the mask of the present invention, a liner may be provided on the application surface of the adhesive layer in order to protect the adhesive layer. This liner is peeled off when the mask is used. Such a liner is not particularly limited as long as it can protect the adhesive layer, and examples thereof include polyolefins such as polyethylene and polypropylene; polyvinyls such as ethylene-vinyl acetate copolymers, vinyl acetate-vinyl chloride copolymers, and polyvinyl chloride; polyamides; polyesters such as polyethylene terephthalate; cellulose derivatives; synthetic resins such as polyurethane, films and sheets made of materials such as aluminum and paper, and laminates thereof. As such a liner, it is preferable that a release treatment such as a silicone compound coating or a fluorine compound coating is applied to the surface on the side in contact with the adhesive layer so that it can be easily peeled off from the adhesive layer.

[0038] The mask of the present invention can be produced, for example, by the following method: First, the components constituting the pressure-sensitive adhesive layer are uniformly mixed and / or dissolved using a stirrer to prepare a pressure-sensitive adhesive composition containing the components in a predetermined ratio.

[0039] Next, the obtained adhesive composition is spread on the surface of the liner to a desired mass per unit area to form the adhesive layer, and then the adhesive layer is attached to the inner surface of the mask base fabric to obtain the mask of the present invention. At this time, the mask base fabric may be cut into a desired shape beforehand, and then the adhesive layer may be attached, or the adhesive layer may be attached to the mask base fabric, and then cut into a desired shape.

[0040] The mask of the present invention can also be produced by spreading the pressure-sensitive adhesive composition on the inner surface of the mask base fabric to a desired mass per unit area to form the pressure-sensitive adhesive layer, and then laminating the liner on the surface of the pressure-sensitive adhesive layer. In this case, the pressure-sensitive adhesive layer may be formed on the surface of the mask base fabric that has been cut into a desired shape in advance, or the liner may be laminated and then cut into a desired shape. EXAMPLES

[0041] 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 the following examples. Various performance evaluation tests of the masks prepared in the examples and comparative examples were carried out by the following methods.

[0042] <Test 1> The masks produced in the Examples and Comparative Examples were attached to the faces of subjects with the adhesive layer attached to the cheeks. The state of adhesion of the adhesive layer to the cheeks was then checked at specified time intervals and evaluated according to the following criteria, and the average score for adhesion stability evaluated by the four subjects was calculated. 5: The adhesive layer did not peel off. 4: Only the edges of the adhesive layer are peeled off. 3: 1 / 3 of the adhesive layer peeled off. 2: Half of the adhesive layer peeled off. 1: The mask falls off the face.

[0043] After 4 hours had passed since the mask was worn, the subjects removed the mask. The pain felt on the cheeks and the stickiness felt on the cheeks after removal were checked and rated according to the following criteria, and the average scores of the pain and stickiness felt on removal by the four subjects were calculated. (pain) 5: No pain. 4: Almost no pain. 3: Some pain. 2: Painful. 1: Severe pain. (Sticky) 5: Non-sticky. 4: Almost no stickiness. 3: Slightly sticky. 2: Sticky. 1: Significant stickiness.

[0044] <Test 2> First, the masks prepared in the Examples and Comparative Examples were attached to the cheeks of the subjects, and the state of adhesion of the adhesive layer to the cheeks was checked 15 minutes after the masks were worn, and the masks were removed. The state of adhesion of the adhesive layer was evaluated according to the following criteria, and the average score of the adhesion evaluation by the four subjects was calculated.

[0045] Next, the removed mask was again attached to the cheeks with the adhesive layer attached to the face of the subject, and 30 minutes after the first mask was worn, the state of adhesion of the adhesive layer to the cheeks was checked, and the mask was removed. The confirmed adhesion state of the adhesive layer was evaluated according to the following criteria, and the average score of the re-adhesion evaluation by the four subjects was calculated. After that, the mask was worn, the adhesion state of the adhesive layer was checked, and the mask was removed repeatedly at predetermined intervals, and the average score of the re-adhesion evaluation by the four subjects was calculated. 5: The adhesive layer did not peel off. 4: Only the edges of the adhesive layer are peeled off. 3: 1 / 3 of the adhesive layer peeled off. 2: Half of the adhesive layer peeled off. 1: The mask falls off the face.

[0046] Example 1 The components constituting the adhesive layer shown in Table 1 were weighed out so as to obtain the composition shown in the same table, and mixed using a stirrer at 160 to 200°C until uniform, to prepare an adhesive composition. This adhesive composition was applied at 200 g / m2 onto the surface of a liner (a release-treated polyester film, width: 36 cm). 2 After spreading the mask so as to form an adhesive layer, the mask was cut to a size of 7.2 cm in length and 1.5 cm in width, and the adhesive layer was attached to both the left and right ends of the inner surface of a mask base fabric (nonwoven fabric made of polypropylene resin) to produce a mask having the shape shown in Figure 1. The mask thus obtained was subjected to the above-mentioned tests 1 and 2 to evaluate various performances of the mask. The results are shown in Table 1.

[0047] The following commercially available products were used as ingredients. Styrene-isoprene-styrene block copolymer ("SIS5002" manufactured by JSR Corporation). -Polyisobutylene (BASF "Oppanol B12SFN"). -Terpene resin (Yasuhara Chemical Co., Ltd. "YS Resin PX1150N"). -Hydrogenated rosin glycerin ester ("KE-311E" manufactured by Arakawa Chemical Industries, Ltd.). Liquid paraffin ("Hicol M-352" manufactured by Kaneda Co., Ltd.).

[0048] [Table 1]

[0049] As is clear from the results shown in Table 1, by blending (A) a terpene resin, (B) hydrogenated rosin glycerin ester, and (C) liquid paraffin such that the content of component (B), the mass ratio of components (A) to (B) [A / B], the total content of components (A) and (B), and the mass ratio of component (C) to the total content of components (A) and (B) [C / (A+B)] are within the specified ranges, it was confirmed that a mask having an adhesive layer that is free from pain when removed and stickiness after removal and has excellent adhesion stability and re-adhesion can be obtained (Examples 1 to 4).

[0050] On the other hand, when the content of component (B) was high and the mass ratio [A / B] of components (A) to (B) was low, no pain was felt when removing the adhesive layer or stickiness after removal was observed, but it was confirmed that the adhesive stability and re-adhesion of the adhesive layer were reduced (Comparative Examples 1 and 2).On the other hand, when the content of component (B) was low and the mass ratio [A / B] of components (A) to (B) was high, it was confirmed that, although the adhesive stability and re-adhesion of the adhesive layer were excellent, pain was felt when removing the adhesive layer or stickiness after removal occurred (Comparative Examples 3 and 4).

[0051] In addition, when the total content of components (A) and (B) was low and the mass ratio of component (C) to the total content of components (A) and (B) [C / (A+B)] was high, no pain was felt during removal or stickiness after removal was observed, but it was confirmed that the adhesive stability and re-adhesion of the adhesive layer were reduced (Comparative Example 5).On the other hand, when the total content of components (A) and (B) was high and the mass ratio of component (C) to the total content of components (A) and (B) [C / (A+B)] was low, it was confirmed that the adhesive stability and re-adhesion of the adhesive layer were excellent, but pain was felt during removal and stickiness after removal occurred (Comparative Example 6). [Industrial Applicability]

[0052] As described above, according to the present invention, it is possible to form an adhesive layer that has excellent adhesion stability and re-adhesion to the cheek, and further that suppresses the occurrence of pain when removing the adhesive layer and stickiness after removal.

[0053] Therefore, the mask of the present invention has an adhesive layer that has excellent adhesion stability and re-adhesion properties, and is less likely to cause pain when removed or stickiness after removal, making it useful as a mask that does not have ear loops and is worn by attaching the adhesive part to the cheek. [Explanation of symbols]

[0054] 1: Adhesive layer 2: Mask base fabric

Claims

1. The mask comprises a mask base fabric and an adhesive layer provided on the inner surface of both left and right ends of the base fabric, the pressure-sensitive adhesive layer contains a rubber-based adhesive base, (A) a terpene-based resin, (B) a hydrogenated rosin glycerin ester, and (C) liquid paraffin; the content of the (B) hydrogenated rosin glycerin ester is within a range of 8 to 22 mass% based on the total mass of the pressure-sensitive adhesive layer, a mass ratio of the content of the terpene resin (A) to the content of the hydrogenated rosin glycerin ester (B) is in the range of A / B=0.3 to 2.0; a total content of the (A) terpene resin and the (B) hydrogenated rosin glycerin ester in the pressure-sensitive adhesive layer is within a range of 20 to 35% by mass, based on the total mass of the pressure-sensitive adhesive layer; the mass ratio of the content of the liquid paraffin (C) to the total content of the terpene resin (A) and the hydrogenated rosin glycerin ester (B) is in the range of C / (A+B) = 1.0 to 3.0; A mask characterized by:

2. 2. The mask according to claim 1, wherein the adhesive layer has a length in the longitudinal direction within a range of 2 to 10 cm and a width within a range of 0.5 to 3 cm.

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