JP2019208693A - Skin patch - Google Patents

Abstract

To provide a skin patch that is unlikely to unstick from skin.SOLUTION: A skin patch (1) comprises a supporting base material (2) and an aqueous gel (3) laminated along one entire surface of the supporting base material (2). The aqueous gel (3) has a vertical cross-sectional shape of protruding toward the supporting base material (2) side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a patch used by being affixed to human skin.

  Examples of this type of patch include poultices and coolants for fever, headache, toothache, cooling of affected areas during inflammation, cooling of hot flashes on the face, etc., and cooling of muscles after sports. Conventionally, as shown in FIG. 4, a structure in which an aqueous gel 102 is laminated on a support substrate 101 and the aqueous gel 102 is covered with a release film 103 is generally known.

  For example, as shown in Patent Document 1, this conventional patch 100 is a band-shaped patch sheet in which an aqueous gel is applied onto a long support substrate and then a long release film is superimposed on the surface thereof. It is manufactured by cutting into a predetermined size with a cutting blade. In Patent Document 1, before cutting the patch sheet into individual patches of a predetermined size with a cutting blade, the cutting position of the patch sheet is pressed to extrude and eliminate the aqueous gel at the cutting position. It is carried out. This prevents the aqueous gel from being exposed on the end face (cut face) of the cut patch.

Japanese Patent No. 4245343

  In the conventional patch 100, the aqueous gel 102 does not exist in the vicinity of the outer peripheral edge due to the above-described creasing. Therefore, as shown in FIG. 5, the patch 100 is attached to the user's skin S due to the adhesiveness of the aqueous gel 102, but when the aqueous gel 102 does not exist in the vicinity of the outer periphery, The outer peripheral edge of the support base material 101 is rolled up, and the patch 100 is easily peeled off from the skin S.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a patch that does not easily peel off from the skin.

  The patch of the present invention comprises a support base material and an aqueous gel laminated over the entire area of one side of the support base material, and the aqueous gel has a longitudinal section that is convex toward the support base material side. It has a shape.

  In the patch of the present invention, the water content of the aqueous gel is preferably 60% by weight or more and 95% by weight or less.

  Moreover, in the patch of this invention, it is preferable that the said support base material is a nonwoven fabric.

  The patch of the present invention preferably further comprises a release film that covers the aqueous gel.

  Moreover, in the patch of this invention, it is preferable that the said nonwoven fabric consists of a polyethylene terephthalate resin fiber, and the said peeling film consists of polyolefin resin.

  In the patch of the present invention, the aqueous gel may further have a longitudinal cross-sectional shape that is convex in a direction opposite to the support base.

  According to the patch of the present invention, since the longitudinal cross-sectional shape of the aqueous gel has a shape that is convex toward the support substrate side, when the patch is applied to the skin of the user, the support substrate The outer peripheral edge of the base material is shaped so as to wrap the aqueous gel, and the support base material adheres to the skin due to the adhesiveness of the aqueous gel in a state where the outer peripheral edge of the supporting base material is stuck to the skin of the user. Therefore, it can suppress that the outer periphery of a support base material rolls up, and can make it hard to peel a patch from skin.

It is a top view of the patch which concerns on one Embodiment of this invention. It is sectional drawing which shows schematic structure of the longitudinal cross-section in alignment with the AA of FIG. It is explanatory drawing which shows a state when a patch is affixed on skin. It is sectional drawing which shows schematic structure of the longitudinal cross-section of the patch of a prior art example. It is explanatory drawing which shows a state when the patch of a prior art example is affixed on skin.

  Hereinafter, embodiments of the patch of the present invention will be described with reference to the accompanying drawings. The patch of the present invention is used by being affixed to human skin, for example, fever, headache, toothache, cooling of the affected area during inflammation, cooling of hot flashes on the face, etc., and cooling of muscles after sports. The sheet-like coolant used for down etc. can be illustrated.

  FIG.1 and FIG.2 shows the patch 1 of this embodiment. The patch 1 has at least a support substrate 2, an aqueous gel 3, and a release film 4, and has a layer structure in which these are laminated. Prior to use, the patch 1 is stored in a packaging bag (not shown) in a stacked state. In use, the patch 1 is taken out from the packaging bag, the release film 4 is peeled off from the support base 2, and then the exposed aqueous gel 3 is directly applied to the site to be cooled of the skin. It is affixed to the user's skin due to its adhesiveness. As a result, the moisture contained in the aqueous gel 3 evaporates with time, and the temperature of the aqueous gel 3 is reduced by the heat of vaporization taken away at that time, so that the skin in contact with the aqueous gel 3 is cooled.

  The thickness and size of the patch 1 are not particularly limited, and the thickness and size can be appropriately set according to the purpose and the site to be cooled. Further, the external shape of the patch 1 is not particularly limited, and is rectangular in plan view in the present embodiment, but may be various other shapes such as a square shape, a circular shape, and an elliptical shape.

  The support substrate 2 supports the aqueous gel 3 on one surface thereof. The support base material 2 is not particularly limited as long as the support base material 2 has moisture permeability and air permeability and can carry the aqueous gel 3, and is formed of various woven fabrics, nonwoven fabrics, films, and the like. can do. When woven fabric or non-woven fabric is used as the material for the supporting substrate 2, natural fibers such as cotton, hemp, wool, etc .; cellulosic fibers such as rayon and acetate; nylon, vinylon, styrene, polypropylene, polyethylene, polyethylene terephthalate, Examples thereof include synthetic resin fibers such as acrylic. Moreover, when using a film as a raw material of the support base material 2, a polystyrene (styrene), a polypropylene, a polyethylene terephthalate, polyethylene etc. can be illustrated.

  The thickness of the support substrate 2 is not particularly limited, but is preferably 0.1 mm or more and 3.0 mm or less, and preferably 0.5 mm or more from the viewpoints of feeling of use, ease of fitting to the pasting site, and the like. More preferably, it is 2.0 mm or less.

  It is preferable that the support base material 2 has an appropriate stretchability so as to fit and adapt to various application sites of the body to be applied. The degree of stretchability is not particularly limited, and the stretch direction can be stretched and contracted only in one direction (longitudinal direction) of the support base 2, and only the other upper (width direction) orthogonal to the one direction. It is possible to expand and contract, or it is possible to expand and contract both in one direction (longitudinal direction) and the other direction (width direction), but it is preferable that it can expand and contract in both directions.

  The aqueous gel 3 is formed by being laminated over the entire area of one surface of the support base 2. As the aqueous gel 3, various materials that are compatible with the skin can be used. In the present invention, “the aqueous gel is laminated over the entire area of one side of the supporting base material” means that the aqueous gel 3 is laminated over the substantially entire area of the one side of the supporting base material 2. In addition to the state in which the aqueous gel 3 is laminated over the entire area of the one surface of the support base material 2, the aqueous gel 3 is laminated in the most area (almost the entire area) of the one surface of the support base material 2. However, it includes a state in which the aqueous gel 3 is not laminated in a slight region of the corner along the outer peripheral edge of the one surface of the support base 2. If the area of the corner of one surface of the support substrate 2 is a streak whose width from the outer periphery of the support substrate 2 is 2.0 mm or less, more preferably 1.0 mm or less, and even more preferably 0.5 mm or less. The aqueous gel 3 is allowed as being laminated over the entire area of one side of the support base 2.

The thickness of the aqueous gel 3 is not particularly limited, but is preferably appropriately large from the viewpoints of cooling power, feel when affixed to the skin, maintenance of the affixed state to the skin, and the like. For example, it is preferable that the thickness _{D C} of the aqueous gel 3 at the center position of the support substrate 2 is 0.1mm or more 20mm or less, and more preferably less than 1.0mm 10mm or less. The thickness of the aqueous gel 3 can be measured using the method described in “6.1 Thickness (ISO Method)” of JIS L1913: 2010.

  In addition, the thickness of the aqueous gel 3 rises high at the center position of the support base 2 and gradually decreases toward the outer peripheral edge. That is, the aqueous gel 3 has a flat or substantially flat surface on the release film 4 side in a longitudinal sectional view, and a surface on the support base material 2 side has a mountain shape, and is convex toward the support base material 2 side. The central portion is raised from the outer peripheral edge, and the outer peripheral portion is tapered so that the outer peripheral edge of the support base material 2 encloses the aqueous gel 3. In FIG. 2, the aqueous gel 3 protrudes in a dome shape on the support base material 2 side. However, if the central portion protrudes toward the support base material 2 side with respect to the outer peripheral edge, the center portion May be raised in a flat or substantially flat substantially trapezoidal shape.

  The aqueous gel 3 has water repellency, moisture release, self-retaining property, adhesiveness and the like. “Hydrophilic” means the property of stably containing water inside, but more preferably means the property of not exuding the contained water even when further compressed. “Self shape retention” means the property of maintaining the shape without causing significant fluidity or disintegration.

  Examples of components that can exhibit such properties including water include natural polymer polysaccharides that are generally used as gelling agents. Specifically, natural gums such as carrageenan, alginic acid, propylene glycol alginate, tara gum, locust bean gum, glucomannan, xanthan gum, gellan gum, pectin, pullulan, guar gum, psyllium gum, sodium alginate, mannan, gelatin, agar Can be illustrated. These can be used alone or in combination of two or more. Preferably, glucomannan and locust bean gum can be exemplified.

  Examples of the gelling agent include polyacrylic acid, polymethacrylic acid, a salt of polyacrylic acid, a salt of polymethacrylic acid, and the like in addition to the natural polymer polysaccharide described above. These can be used alone or in combination of two or more.

  Aqueous gel 3 is a cooling agent such as polyhydric alcohol, surfactant, preservative, preservative, stabilizer, flavor, colorant, pH adjuster, limonene, camphor, peppermint oil or l-menthol as other components. It may contain known additives such as agents, moisturizers, stimulants, disinfectants, antibacterial agents, tackifiers, shape retainers, thickeners and the like.

  The aqueous gel 3 preferably contains a sufficient amount of moisture in order to continuously exhibit a desired cooling power, and the water content of the aqueous gel 3 is in the composition constituting the aqueous gel 3. 60% by weight or more, more preferably 70% by weight or more. In addition, the upper limit of the water content of the aqueous gel 3 is preferably 95% by weight or less, and more preferably 90% by weight or less, from the viewpoint of self-shape retention.

  The release film 4 covers the aqueous gel 3 before using the patch 1, and the release film 4 can improve the handleability and hygiene of the patch 1. The material of the release film 4 is not particularly limited as long as the aqueous gel 3 can be coated. Examples of the release film 4 include synthetic resins such as polypropylene, polyethylene, polyester, nylon, vinyl chloride, and polyethylene terephthalate. .

  Although not shown, the patch 1 having the above-described configuration is efficiently cut by cutting a patch sheet in which a plurality of the patch 1 is continuous in at least one direction along a cutting line that divides the patch 1 into individual patches 1. Can be manufactured well. Here, when cutting the patch sheet, for example, the patch sheet is sandwiched between the ultrasonic vibration device and the cutting device, and the horn of the ultrasonic vibration device is brought into contact with the patch 1 in the cutting line of the patch sheet. By cutting the patch sheet with the cutting blade of the cutting device while applying ultrasonic vibration, the aqueous gel 3 adheres to the cutting blade even when the aqueous gel 3 is laminated to the outer peripheral edge of the support base 2. It is possible to produce the patch 1 with a clean cut surface by cutting the patch sheet with high accuracy without doing so. After cutting the patch sheet into individual patches 1, the patch 1 is manufactured by performing a treatment for solidifying the aqueous gel 3.

  When cutting the above-mentioned patch sheet, the patch sheet is cut with the cutting blade of the cutting apparatus while the ultrasonic vibration is applied by bringing the horn of the ultrasonic vibration apparatus into contact with the release film 4 to thereby apply the patch. Since the release film 4 is welded to the support substrate 2 along with the cutting of the sheet, the outer peripheral edges of the support substrate 2 and the release film 4 can be joined to each other while having a narrow stripe shape. Thereby, the aqueous gel 3 can be enclosed in the inside of the support base material 2 and the peeling film 4. In order to cut and bond the support substrate 2 and the release film 4 satisfactorily, the support substrate 2 is made of a nonwoven fabric made of polyethylene terephthalate resin fibers, and the release film 4 is made of a polyolefin resin such as polypropylene or polyethylene. It is preferable to become.

  According to the patch 1 of the present embodiment described above, since the aqueous gel 3 is laminated over the entire area of the support base material 2, when the patch 1 is applied to the user's skin, The peripheral edge adheres well to the skin due to the adhesiveness of the aqueous gel 3. In addition, as shown in FIG. 3, the support base material 2 is shaped so as to wrap the aqueous gel at the outer periphery, and sticks without floating from the user's skin. Therefore, since it can suppress that the outer periphery of the support base material 2 rolls up, the patch 1 can be made hard to peel from skin.

  Moreover, according to the patch 1 of this embodiment, the aqueous gel 3 is laminated | stacked on the whole region of the support base material 2, and the range of the skin which can give a desired cooling power with the patch 1 is increased. Can do.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the said embodiment, although the support base material 2 and the peeling film 4 are the same shapes, if the water-based gel 3 laminated | stacked on the support base material 2 can be covered, the peeling film 4 will differ from the support base material 2. It may have a shape.

  Moreover, in the said embodiment, although the patch 1 is a three-layer structure of the support base material 2, the aqueous gel 3, and the peeling film 4, you may have another layer.

  Moreover, in the said embodiment, although the surface at the side of the peeling film 4 of the aqueous gel 3 is flat or substantially flat in the longitudinal cross-sectional view, the surface at the side of the peeling film 4 of the aqueous gel 3 is also a mountain shape. By forming the shape, a convex shape may be exhibited even when facing the release film 4 side in the direction opposite to the support base material 2 side.

DESCRIPTION OF SYMBOLS 1 Patch 2 Support base material 3 Aqueous gel 4 Release film

Claims (6)

A support substrate, and an aqueous gel laminated over the entire area of one side of the support substrate,
The said aqueous gel is a patch which is exhibiting the longitudinal cross-sectional shape which becomes convex toward the said support base material side.   The patch according to claim 1, wherein the water gel has a water content of 60 wt% or more and 95 wt% or less.   The patch according to claim 1 or 2, wherein the supporting substrate is a nonwoven fabric.   The patch according to any one of claims 1 to 3, further comprising a release film covering the aqueous gel.   The patch according to claim 4, wherein the nonwoven fabric is made of polyethylene terephthalate resin fibers, and the release film is made of a polyolefin resin.   The said aqueous gel is a patch as described in any one of Claims 1-5 which is exhibiting the longitudinal cross-sectional shape which becomes convex also in the direction opposite to the said support base material side.