JP7783699B2 - mask - Google Patents

Description

The present invention relates to masks, and more particularly to masks without ear loops.

Conventionally, masks that do not have ear loops and are worn by attaching the adhesive part to the cheeks have been known as masks to prevent the entry of dust, dirt, house dust such as mites, pollen, mold, bacteria, viruses, etc.

For example, Japanese Utility Model Publication No. 7-386 (Patent Document 1), Japanese Patent Publication No. 2007-20983 (Patent Document 2), Japanese Patent Publication No. 2014-8367 (Patent Document 3), and Japanese Utility Model Registration No. 3231212 (Patent Document 4) disclose masks equipped with adhesive sections on both ends and four corners of the mask body, and state that the mask can be worn on the face by attaching these adhesive sections to the cheeks. Furthermore, Japanese Patent Publication No. 11-128378 (Patent Document 5) and Japanese Patent Publication No. 2011-10903 (Patent Document 6) disclose masks with adhesive sections formed on the periphery of the mask body, and state that by adhering these adhesive sections to the skin, the mask can be worn on the face without creating any gaps between the mask and the face.

Japanese Utility Model Application Publication No. 7-386 Japanese Patent Application Laid-Open No. 2007-20983 Japanese Patent Application Laid-Open No. 2014-8367 Utility Model Registration No. 3231212 Japanese Patent Application Publication No. 11-128378 JP 2011-10903 A

However, conventional masks, which are worn on the face by sticking the adhesive part to the cheeks, etc., do not necessarily have sufficient adhesion stability or re-adhesion between the adhesive part and the cheeks, and can cause pain when removing the mask or leave a sticky feeling after removal.

The present invention was made in consideration of the problems associated with the above-mentioned conventional technology, and aims to provide a mask in which the adhesive layer has excellent adhesion stability and re-adhesion to the cheek area, and which also reduces the occurrence of pain when removing the mask and stickiness after removal.

As a result of extensive research to achieve the above-mentioned objective, the inventors discovered that by blending (A) terpene resin, (B) hydrogenated rosin glycerin ester, and (C) liquid paraffin in specific ratios, an adhesive layer is formed that is free from pain when removing the adhesive and stickiness after removal, and that has excellent adhesion stability and re-adhesion, leading to the completion of the present invention.

That is, the mask of the present invention 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 adhesive layer containing a rubber-based adhesive base , (A) a terpene resin, (B) a hydrogenated rosin glycerin ester, and (C) liquid paraffin, the content of the (A) terpene resin being in the range of 12 to 13.5% by mass of the entire adhesive layer, the mass ratio of the content of the (B) hydrogenated rosin glycerin ester to the content of the (A) terpene resin being in the range of B/A = 0.6 to 3.0, the total content of the (A) terpene resin and the (B) hydrogenated rosin glycerin ester being in 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 in the range of C/(A + B) = 1.0 to 3.0.

In the mask of the present invention , it is preferable that the length of the pressure-sensitive adhesive layer in the longitudinal direction is in the range of 2 to 10 cm, and the width is in the range of 0.5 to 3 cm.

The present invention makes it possible to obtain a mask that has excellent adhesive stability and re-adhesion of the adhesive layer to the cheek area, and that also reduces pain when removing the mask and stickiness after removal.

1 is a schematic diagram showing a preferred embodiment of a mask of the present invention. FIG. 1 is a schematic diagram showing another preferred embodiment of the mask of the present invention.

The present invention will now be described in detail with reference to preferred embodiments.

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 contains an adhesive base, (A) a terpene resin, (B) a hydrogenated rosin glycerin ester, and (C) liquid paraffin.

The adhesive base used in the present invention is not particularly limited, and examples include rubber-based adhesive bases, acrylic-based adhesive bases, polyurethane-based adhesive bases, silicone-based adhesive bases, and hydrogels made of aqueous polymers. 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, with rubber-based adhesive bases being more preferred, from the viewpoints of allowing the adhesive layer to be spread without seeping through to the back of the base fabric and maintaining anchoring properties between the base fabric and the adhesive layer.

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. Among these rubber-based adhesive bases, styrene-isoprene-styrene block copolymer, polyisobutylene, and mixtures thereof are preferred from the viewpoints of excellent adhesive stability and re-adhesion of the adhesive layer to the cheek, as well as suppressing pain upon removal and stickiness after removal. Specific examples of styrene-isoprene-styrene block copolymers include Quintac 3570C (trade name, manufactured by Nippon Zeon Co., Ltd.) and SIS5002 (trade name, manufactured by JSR Corporation). Specific examples of polyisobutylene include Oppanol B12, B15, N50, B50, N80, B80, N100, B100, B120, N150, B150, and B220 (trade names, manufactured by BASF), JSR Butyl 065, 268, and 365 (trade names, manufactured by JSR Corporation), Vistanex LM-MS, MH, H, MML-80, 100, 120, and 140 (trade names, manufactured by Exxon Chemical Company), HYCAR (trade name, manufactured by Goodrich Chemicals), and SIBSTAR T102 (trade name, manufactured by Kaneka Corporation).

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. More specific examples include DURO-TAK 87-2097, 87-2194, 87-2196, 87-2287, 87-2516, 87-2852, 87-4287, and 87-900A (trade names, manufactured by Henkel), as well as MAS811 and MAS683 (trade names, manufactured by Cosmedy Pharmaceutical Co., Ltd.). These acrylic adhesive bases may be used alone or in combination of two or more types.

Examples of the polyurethane-based adhesive base include aliphatic polyurethane adhesive bases and aromatic polyurethane adhesive bases. These polyurethane-based adhesive bases may be used alone or in combination of two or more types.

Examples of the silicone-based adhesive base include adhesive bases whose main component is silicone rubber, such as polydimethylsiloxane, polymethylvinylsiloxane, and polymethylphenylsiloxane. 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 names, manufactured by DuPont-Toray Specialty Materials Co., Ltd.). These silicone-based adhesive bases may be used alone or in combination of two or more.

Examples of hydrogels made from aqueous polymers include those containing gelatin, carrageenan, hydroxyethyl cellulose, polyacrylic acid, neutralized polyacrylic acid, etc. as their main components. These hydrogels may be used alone or in combination of two or more.

The content of such adhesive base is preferably 15 to 35% by mass, more preferably 20 to 30% by mass, and even more preferably 26 to 30% by mass, of the entire adhesive layer. If the content of adhesive base is below the lower limit, the cohesive strength of the adhesive layer tends to decrease. On the other hand, if the content exceeds the upper limit, the adhesive strength of the adhesive layer tends to decrease.

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 because they have excellent adhesion stability and re-adhesion of the adhesive layer to the cheek, and furthermore, they suppress the occurrence of pain when removing the adhesive and stickiness after removal.

In the present invention, the content of the terpene resin (A) must be within the range of 6 to 18% by mass of the entire pressure-sensitive adhesive layer. If the content of component (A) is below the lower limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer will decrease. On the other hand, if the content of component (A) exceeds the upper limit, pain will occur when removing the mask and stickiness will occur after removal. Furthermore, from the viewpoint of improving the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer, the lower limit of the content of component (A) is preferably 8% by mass or more, and more preferably 12% by mass or more. On the other hand, from the viewpoint of reliably suppressing pain when removing the mask and stickiness after removal, the upper limit of the content of component (A) is preferably 16% by mass or less, and more preferably 13.5% by mass or less.

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

In the present invention, the mass ratio of the content of the hydrogenated rosin glycerin ester (B) to the content of the terpene resin (A) must be within the range of B/A = 0.6 to 3.0. If the mass ratio [B/A] of component (B) to component (A) 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 [B/A] of component (B) to component (A) exceeds the upper limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer decrease. Furthermore, from the viewpoint of reliably suppressing pain when removing the mask and stickiness after removal, the lower limit of the mass ratio [B/A] is preferably 0.69 or more, and more preferably 1.00 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 mass ratio [B/A] is preferably 2.38 or less, and more preferably 1.25 or less.

In addition, in the present invention, the total content of the (A) terpene resin and the (B) hydrogenated rosin glycerin ester must be within the range of 20 to 35% by mass of 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 will decrease. On the other hand, if the total content of components (A) and (B) exceeds the upper limit, pain will occur when removing the mask and stickiness will occur 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 pain when removing the mask and 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.

Furthermore, the liquid paraffin (C) used in the present invention acts as a plasticizer. From the viewpoints of improving the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer and reliably suppressing pain when removing the mask and stickiness after removal, the liquid paraffin (C) preferably has a viscosity of 34.5 to 150 mm ² /s at 40°C.

In the present invention, 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 must be in the range of C/(A+B) = 1.0 to 3.0. If the mass ratio of component (C) to the total content of components (A) and (B) [C/(A+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 of component (C) to the total content of components (A) and (B) [C/(A+B)] exceeds the upper limit, the adhesive stability and re-adhesion of the pressure-sensitive adhesive layer decrease. Furthermore, from the viewpoint of reliably suppressing pain when removing the mask and stickiness after removal, the lower limit of the mass ratio [C/(A+B)] is preferably 1.2 or greater, and more preferably 1.5 or greater. 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.

Furthermore, in the present invention, such adhesive layer may further contain various additives such as tackifying resins other than terpene resins and hydrogenated rosin glycerin esters (e.g., alicyclic saturated hydrocarbon resins), solubilizers, humectants, stabilizers, inorganic powders, colorants, flavorings, and pH adjusters, provided that the effects of the present invention are not impaired.

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

In the mask of the present invention, the size of the adhesive layer is preferably such that the vertical length is within the range of 2 to 10 cm, more preferably within the range of 3 to 9 cm, and particularly preferably within the range of 4 to 8 cm, and the width is preferably within the range of 0.5 to 3 cm, more preferably within the range of 0.8 to 2.5 cm, and particularly preferably within the range of 1 to 2 cm. If the vertical length or width of the adhesive layer is below the lower limit, sufficient adhesive strength is not obtained, and the mask tends to fall off the face during use. On the other hand, if it exceeds the upper limit, the size of the mask fabric becomes large, which tends to cause pain when removing the mask. In this invention, the vertical length of the adhesive layer refers to the length parallel to the vertical direction of the mask (the vertical direction of the mask), and the width of the adhesive layer refers to the length 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. Furthermore, when the length of the adhesive layer in the vertical direction is not constant, as in the case of the mask shown in Figure 1, the length of the longest part of the adhesive layer in the vertical direction is taken as the length L of the adhesive layer in the vertical direction.

Furthermore, in the mask of the present invention, the mass of the pressure-sensitive adhesive layer is not particularly limited as long as it is an amount that can ensure adhesive strength, but the mass per unit area of the adhesive surface of the pressure-sensitive adhesive layer is preferably in the range of 160 to 240 g/ ^m2 , and more preferably in the range of 180 to 220 g/ ^m2 .

There are no particular limitations on the mask base fabric, and known mask base fabrics used in masks to prevent the intrusion of dust, dirt, house dust such as mites, pollen, mold, bacteria, viruses, etc. can be used. Examples of materials for such mask base fabrics include polyolefins such as polyethylene and polypropylene; polyvinyls such as ethylene-vinyl acetate copolymer, vinyl acetate-vinyl chloride copolymer, 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 layers of two or more. When two or more layers are used in layers, base fabrics of the same material may be used, or base fabrics of different materials may be used in combination. Furthermore, a structure may be formed in which a functional sheet, such as a sheet with a built-in virus droplet collection filter, is sandwiched between two base fabrics.

When the mask fabric of the present invention is a nonwoven fabric, the basis weight of the nonwoven fabric is preferably 80 to 150 g/ ^m² , more preferably 95 to 125 g/ ^m² , from the viewpoint of being able to spread the PSA layer without bleeding to the back side of the fabric and maintaining anchoring properties between the fabric and the PSA layer. The thickness of the nonwoven fabric is preferably 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 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 Figures 1 and 2, and the transverse direction of the mask means the direction perpendicular to the vertical direction of the mask as shown in Figures 1 and 2.

The mask of the present invention may also include a liner on the adhesive surface of the adhesive layer to protect the adhesive layer. This liner is peeled off when the mask is used. There are no particular limitations on such liners, so long as they can protect the adhesive layer. Examples include polyolefins such as polyethylene and polypropylene; polyvinyls such as ethylene-vinyl acetate copolymer, vinyl acetate-vinyl chloride copolymer, and polyvinyl chloride; polyamides; polyesters such as polyethylene terephthalate; cellulose derivatives; synthetic resins such as polyurethane; and films and sheets made of materials such as aluminum and paper, as well as laminates thereof. It is preferable that such liners have a release treatment, such as a silicone-containing compound coating or a fluorine-containing compound coating, applied to the surface that comes into contact with the adhesive layer so that they can be easily peeled off.

The mask of the present invention can be manufactured, for example, by the following method. First, the components constituting the adhesive layer are uniformly mixed and/or dissolved using a stirrer to prepare an adhesive composition containing the components in a specified ratio.

The resulting adhesive composition is then spread onto the surface of a liner to form the desired mass per unit area to form the adhesive layer, and the adhesive layer is then attached to the inner surface of the mask fabric, thereby obtaining the mask of the present invention. In this case, the mask fabric may be cut into the desired shape beforehand and then the adhesive layer is attached, or the adhesive layer may be attached to the mask fabric and then cut into the desired shape.

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

The present invention will be explained in more detail below based on examples and comparative examples, but the present invention is not limited to the following examples. Various performance evaluation tests of the masks produced in the examples and comparative examples were conducted using the following methods.

<Test 1>
The masks produced in the Examples and Comparative Examples were worn on 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 edge of the adhesive layer 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.

After 4 hours had passed since the mask was first worn, the subjects removed the mask. The pain felt on the cheeks and the stickiness felt on the cheeks after removal were checked and evaluated according to the following criteria, and the average scores of the four subjects' evaluations of pain and stickiness upon removal were calculated.
(pain)
5: No pain.
4: Almost no pain.
3: Slight pain.
2: Painful.
1: Severe pain.
(sticky)
5: No stickiness.
4: Almost no stickiness.
3: Slightly sticky.
2: Sticky.
1: Significant stickiness.

<Test 2>
First, the masks prepared in the Examples and Comparative Examples were worn on the faces of subjects with the adhesive layer attached to the cheeks. After 15 minutes had passed since wearing the masks, the state of adhesion of the adhesive layer to the cheeks was checked, and the masks were then removed. The adhesion state 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.

Next, the removed mask was again attached to the cheeks with the adhesive layer attached to the cheeks, and the subject wore it on their face. 30 minutes after first wearing the mask, the state of adhesion of the adhesive layer to the cheeks was checked, and the mask was then removed. The checked adhesion state of the adhesive layer was evaluated according to the following criteria, and an average score for the re-adhesion evaluation by the four subjects was calculated. Thereafter, the mask was worn, the adhesion state of the adhesive layer was checked, and the mask was removed repeatedly at predetermined intervals, and an average score for the re-adhesion evaluation by the four subjects was calculated.
5: The adhesive layer did not peel off.
4: Only the edge of the adhesive layer 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.

Example 1
The components constituting the adhesive layer shown in Table 1 were weighed out to give the composition shown in the table, and mixed using a stirrer at 160-200°C until uniform, to prepare an adhesive composition. This adhesive composition was spread onto the surface of a liner (a release-treated polyester film, width: 36 cm) to form an adhesive layer at 200 g/ ^m² , and then cut into a size of 7.2 cm length x 1.5 cm width. This adhesive layer was attached to both the left and right ends of the inner surface of a mask base fabric (a polypropylene resin nonwoven fabric), producing a mask with the shape shown in Figure 1. The obtained mask was subjected to Tests 1 and 2 described above, and various performance characteristics of the mask were evaluated. The results are shown in Table 1.

The following commercially available components were used:
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.).

As is clear from the results shown in Table 1, by blending (A) terpene resin, (B) hydrogenated rosin glycerin ester, and (C) liquid paraffin so that the content of component (A), the mass ratio of components (A) to (B) [B/A], 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)]] fall 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).

On the other hand, when the content of component (A) was low and the mass ratio of components (A) to (B) [B/A] 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 Examples 1-2). On the other hand, when the content of component (A) was high and the mass ratio of components (A) to (B) [B/A] was low, the adhesive stability and re-adhesion of the adhesive layer were excellent, but pain was felt during removal and stickiness after removal occurred (Comparative Examples 3-4).

Furthermore, 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 large, 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 small, 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).

As explained above, the present invention makes it possible to form an adhesive layer that has excellent adhesion stability and re-adhesion to the cheek, and further reduces the occurrence of pain when removing the adhesive layer and stickiness after removal.

The mask of the present invention therefore has an adhesive layer that has excellent adhesion stability and re-adhesion, and is less painful to remove and less sticky 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.

1: Adhesive layer 2: Mask base fabric

Claims (2)

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 terpene resin (A) is in the range of 12 to 13.5% by mass based on the entire pressure-sensitive adhesive layer,
a mass ratio of the content of the hydrogenated rosin glycerin ester (B) to the content of the terpene resin (A) is within a range of B/A = 0.6 to 3.0;
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;
A mask characterized in that 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 is in the range of C/(A+B) = 1.0 to 3.0. 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.