JP2016084308A - Skin patch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin patch which can reduce coalescence, folds, and damp at the time of use, while using a nonwoven cloth as a support, and prevent a support surface from fluffing even after peeling a reinforcement layer.SOLUTION: A skin patch according to the present invention comprises a support consisting of a nonwoven cloth, a skin agent held on one face of the support, and a reinforcement layer with a thickness of 10 μm or more peelably formed on the other face. The reinforcement layer side surface of the nonwoven cloth is smoothed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a skin patch used by being applied to the skin.

  Conventionally, external anti-inflammatory analgesics represented by poultices, plasters and the like have been widely used as external medicines that are directly applied to the skin. Also, in recent years, products such as thermal coolants, gels containing moisture on a support made of non-woven fabric, etc., patches for legs and wrinkles, face masks and eye sheets coated with gel-like cosmetics are available. The demand for skin patches is increasing.

  In these skin patches, since the skin agent applied to the support is moderately viscous so that it is easy to adhere to the skin, the skin agent surface of the skin patch usually has a film, release paper, etc. A skin protection layer is applied.

  By the way, in recent years, these skin patches have been required to be thinner in order to prevent stuffiness during use and to eliminate the feeling of use. In order to finish the skin patch thinly, it is necessary to make the support thin. However, when the support is thinned, the skin patch protective layer is sufficiently maintained when the skin patch is peeled off and used. Since this is not possible, there is a problem that the skin patch is struck and the skin surfaces are bonded together. In addition, when the skin patch has low rigidity, there is a problem that it is difficult to freely bond the skin patch when it is applied to the skin.

  As an example of dealing with such a problem, for example, Patent Document 1 discloses a pasting characterized in that cut portions formed with a predetermined interval are put in a release sheet stuck on the entire surface of a plaster. Agents are described. Further, in Patent Document 2, the release sheet attached to the entire surface of the plaster is divided by simply pulling left and right with both ends using the difference in elongation between the release sheet and the support. A patch having a cut portion and an embossed portion formed on the release sheet is described. The patches described in Patent Documents 1 and 2 are all devised on the release sheet for protecting the plaster (skin preparation), but no matter how much the release sheet is devised, the skin patch is applied. Before the adhesive was applied, new problems such as the release sheet peeling off for some reason or the shape of the skin patch changed due to the force applied when the release sheet was peeled off occurred.

  Patent Document 3 and Patent Document 4 disclose examples in which a reinforcing layer is provided on the surface of the support opposite to the drug application surface. The stretchable patch described in Patent Document 3 is characterized in that the reinforcing body and the stretchable sheet are partially bonded with an adhesive strength greater than the adhesive strength between the drug application surface and the skin. In the patch described in Patent Document 4, the stretchable fabric used as a support is mainly a knitted fabric.

JP 2001-245918 A JP 2004-24904 A JP 2003-102774 A JP 2005-119972 A

  In the stretchable patch of Patent Document 3, the portion where the reinforcing body and the stretchable sheet are strongly bonded plays an auxiliary role that it can be used when peeling off the used patch from the skin surface, The reinforcing body is always present on the stretchable sheet even when the stretchable patch is used. For this reason, the strongly bonded portion is difficult to follow the movement of a person, and causes problems such as peeling of the elastic patch or generation of wrinkles. Further, the stretchable patch of Patent Document 3 has a weakly bonded portion where the adhesive strength between the stretchable sheet and the reinforcing layer is weak or a non-bonded portion where these are not bonded. In such weakly bonded parts or non-adhered parts, when the elastic patch is used, the reinforcing layer and the elastic patch are bent when the reinforcing layer rubs with clothes, which gives the user a sense of incongruity. . In addition, the presence of the reinforcing layer at the time of use caused the stretched patch to become stuffy, resulting in poor usability.

  In the method described in Patent Document 4, a knitted fabric is mainly used as a support. In general, since the production cost of knitted fabrics is higher than that of non-woven fabrics, it is difficult to produce a skin patch at low cost by the method described in Patent Document 4, and also from the viewpoints of stretchability, texture, seepage, and air permeability, It is desirable to use a nonwoven fabric rather than a knitted fabric. However, according to a study by the present inventor, when a nonwoven fabric is used as the support, a new problem arises that the fibers constituting the nonwoven fabric are pulled out by the stress when the reinforcing layer is peeled off, and the surface of the support becomes fluffy. all right.

  Under such circumstances, the present invention is able to suppress adhesion, wrinkles, and stuffiness during use while using a nonwoven fabric as a support, and skin with no fluff on the support surface even after the reinforcing layer is peeled off. Providing a patch was raised as an issue.

  As a result of intensive studies to solve the above problems, the present inventor performed a smoothing process on the reinforcing layer side surface of the support made of nonwoven fabric, so that the surface of the support when peeling the reinforcing layer was removed. The present invention was completed by finding out that fuzzing can be suppressed.

That is, the skin patch according to the present invention has the following gist.
[1] A support made of a nonwoven fabric, a skin agent held on one surface of the support, and a reinforcing layer having a thickness of 10 μm or more formed so as to be peelable on the other surface, the reinforcing layer side of the nonwoven fabric A skin patch characterized by having a smooth surface.
[2] The skin patch according to [1], wherein the support includes at least two types of crimped fibers having different heat shrinkage rates.
[3] The longitudinal stress of 50% elongation of the support is 0.5 N / 5 cm to 50 N / 5 cm, and the transverse stress of 50% elongation is 0.2 N / 5 cm to 30 N / 5 cm. The recovery rate at 50% elongation in the longitudinal direction of the support is 20% or more and 95% or less, and the recovery rate at 50% extension in the transverse direction of the support is 20% or more and 95% or less [1] or The skin patch according to [2].
[4] The skin patch according to [1] to [3], wherein the surface of the reinforcing layer is subjected to a process for preventing peeling.
[5] The skin patch according to [1] to [4], wherein the reinforcing layer side surface of the support is smoothed by calendering with a heated metal roll.
[6] The skin patch according to [1] to [5], which is used for external anti-inflammatory analgesics.

  According to the present invention, since the reinforcing layer is provided on the surface of the support, rigidity is imparted, and when the skin patch is affixed to the skin, the surface on the skin agent side does not attach and does not become wrinkles. . In addition, since the surface of the support is smoothed, even if a non-woven fabric is used as the support, fibers constituting the non-woven fabric are not pulled out when the reinforcing layer is peeled off, and fuzz on the support surface during use is suppressed. It becomes possible to do.

FIG. 1 is a schematic sectional view showing a skin patch according to the present invention. FIG. 2 is a schematic perspective view showing an example when printing is performed on the reinforcing surface of the skin patch according to the present invention. FIG. 3 is a schematic perspective view showing an example of a skin patch when the skin patch has a non-fixed portion. FIG. 4 is a schematic perspective view showing an example of a skin patch in the case of having two separable reinforcing layers. FIG. 5 is a schematic perspective view showing an example of a skin patch when it has two separable reinforcing layers and the skin patch has an overlapping portion where a plurality of reinforcing layers overlap.

  Hereinafter, the skin patch according to the present invention will be described in detail with reference to the drawings showing examples. However, the present invention is not limited to the illustrated examples, and may conform to the purpose described above and below. It is also possible to carry out by appropriately changing the range, and all of them are included in the technical scope of the present invention.

<Embodiment 1>
FIG. 1 is a schematic cross-sectional view showing a skin patch according to Embodiment 1 of the present invention. As shown in FIG. 1, a skin patch 10 according to the present invention includes a support 13 made of a nonwoven fabric, a skin agent 14 held on one side of the support, and a thickness formed on the other side so as to be peelable. The reinforcing layer 11 has a thickness of 10 μm or more. In the present invention, a non-woven fabric, which is a material that has the flexibility, breathability, low skin irritation, chemical resistance, and stretchability required for skin patches, and that is difficult for skin agents to bleed out and can be manufactured at low cost. Used as a support. In the skin patch 10, a skin agent protective layer 15 for protecting the skin agent 14 is formed. By forming the skin agent protective layer 15, until the skin patch 10 is used, The dirt and damage of the skin agent 14 can be prevented.

  The method of using the skin patch 10 is as follows. First, the skin patch 10 is taken out from the packaging bag, the skin patch protective layer 15 is peeled off, and then the skin patch 14 is placed on the skin side so that the skin patch 10 is bonded to the skin. . In the present invention, since the reinforcing layer 11 is formed on the skin patch 10, when the skin patch 10 is bonded to the skin, the skin patch 10 becomes a wrinkle or is bonded on the surface of the skin patch 14. This can be suppressed.

  The present invention is characterized in that the reinforcing layer side surface of the nonwoven fabric is smoothed. According to a study by the present inventors, when a nonwoven fabric is used as a support, when the reinforcing layer 11 is peeled, the fibers constituting the nonwoven fabric are attached to the reinforcing layer 11 and pulled out, and the surface of the support 13 becomes fluffy. Was observed. When the surface of the support is fluffed in this way, the appearance deteriorates, and it is necessary to take some measures. Therefore, in the present invention, the inventors have come up with the idea of suppressing fuzz by smoothing the surface of the support by subjecting the support to consolidation such as calendering. If the support is subjected to compaction processing, the surface of the support becomes smooth, so that fluffing on the surface of the support can be suppressed even if the reinforcing layer is peeled off.

  The peel strength of each layer is, for example, between the support 13 and the skin preparation 14 (D), between the skin and the skin preparation 14 (A), between the support 13 and the reinforcing layer 11 (B), and between the skin preparation 14 and the skin preparation. It is preferable to decrease in order of (C) between layers 15 (D> A> B> C). Since the support 13 and the skin preparation 14 need to be integrated at the time of use, the peel strength may be the largest among A to D. Further, since the skin patch is used by peeling the reinforcing layer 11 from the support 13 after being applied to the skin, the skin agent 14 needs to be adhered to the skin when the reinforcing layer 11 is peeled off. Therefore, the peel strength between the skin / dermatological agent 14 (A) may be adjusted to be higher than the peel strength between the support 13 and the reinforcing layer 11 (B). Moreover, it is desirable that the skin agent protective layer 15 can be easily peeled from the skin agent 14 when the skin patch is attached to the skin, and C is preferably adjusted to the lowest value among A to D.

Specifically, the peel strength of each layer is preferably between 0.25 and 0.8N between the skin and the skin agent 14 (A), for example, and depending on the application, for example, 0.25 to 0.8N with a poultice. 0.25 to 0.65N is preferable for the thermal coolant, and 0.25 to 0.55N is preferable for the face mask.
The peel strength between the support 13 and the reinforcing layer 11 (B) is preferably 40 to 80% of the peel strength of A, more preferably 50 to 75%, specifically 0.25 to 0. .5N is preferred.
The peel strength between the skin agent 14 and the skin agent protective layer 15 (C) is preferably 10 to 60%, more preferably 20 to 50% of the peel strength of B. Specifically, 0.05 to 0.45 N is preferable. Depending on the application, for example, 0.05 to 0.15 N for a poultice, 0.15 to 0.45 N for a thermal coolant, and 0.10 to 0 for a face mask. 0.35N is desirable.
The peel strength between the support 13 and the skin preparation 14 (D) is not particularly limited, but is preferably 1.5 N or more.

  The shape of the skin patch 10 is not particularly limited as long as it is appropriately selected depending on the application, but examples thereof include a rectangle, a circle, and a shape corresponding to each skin site. Further, according to the present invention, since the rigidity of the skin patch 10 is increased, a shape that has been difficult to realize in the past, for example, a shape including an acute corner such as a triangle, a trapezoid, or a star may be employed. It becomes possible.

  Skin patch 10 according to the present invention is an anti-inflammatory analgesic for external use such as various sheets applied to the skin, such as a poultice (including water in the base) or a plaster (not including water in the base). A heat-cooling agent (for example, “Hot-sama sheet (registered trademark)” manufactured by Kobayashi Pharmaceutical Co., Ltd.), a patch for legs and heels (for example, “rest time (registered trademark)” manufactured by Lion Corporation), gel-like Can be appropriately used as various hydrogel sheets to be affixed to the skin such as a face mask and eye sheet (for example, “Life Sera (registered trademark)” manufactured by Hisamitsu Pharmaceutical Co., Ltd.). In particular, the present invention can be preferably used for a skin patch for use as an external anti-inflammatory analgesic agent such as a poultice or a plaster agent, which is highly elastic and thin.

1. Next, each member will be described. In the present invention, as the support, it is preferable that the support 13 usually has stretchability so that the skin patch 10 can easily follow the movement of a person. As such a material, a nonwoven fabric having flexibility, breathability, low skin irritation, chemical resistance and stretchability required for a skin patch, and further having a property that the skin agent does not easily permeate is preferably used. . If a non-woven fabric is used, a skin patch can be produced at a relatively low cost, and the cost advantage is great.

  The fibers constituting the support 13 include natural fibers such as cotton, hemp, hair, and silk; regenerated fibers such as rayon, polynosic, cupra, and reyocell; polyamide fibers such as nylon 6 and nylon 66; polyethylene terephthalate fibers and polybutylene Polyester fibers such as terephthalate fiber, polylactic acid fiber and polyarylate; polyolefin fibers such as polyethylene fiber and polypropylene fiber; or water-repellent fibers in which water repellency is imparted to these fibers by fluorine treatment or silicone treatment (for example, JP 2010 -090508 gazette); etc., and these fibers can be used alone or in combination of two or more. These fibers may be crimped fibers having crimps or non-crimped fibers without crimps. Since it is easy to obtain, the support preferably contains polyester fiber, and more preferable polyester fiber is polyethylene terephthalate fiber.

  The cross-sectional shape of the fibers contained in the support 13 is not particularly limited, and any of round cross-sections; irregular cross-sections such as triangles, stars, and pentagons can be used. Furthermore, the fibers contained in the support 13 can be either solid fibers and / or hollow fibers. However, when hollow fibers are used, the bulkiness is the same as that of solid fibers with a small amount of fibers used. Since the nonwoven fabric which has thickness can be manufactured, it becomes possible to achieve weight reduction of a support body.

  The fineness of the fibers contained in the support 13 is preferably, for example, 0.5 dtex or more, more preferably 1 dtex or more, preferably 10 dtex or less, more preferably 7 dtex or less.

  In addition, in order for the support body 13 to exhibit the outstanding elasticity, it is preferable that the support body 13 contains the crimped fiber, for example. As the crimped fiber, either an actual crimped fiber or a latently crimped fiber can be used, but it is preferable to use a latently crimped fiber because of its good spinning performance in a card machine.

  As the form of the crimped fiber, a composite having a core-sheath fiber or a side-by-side structure having an eccentric structure made of a resin having different heat shrinkage rates as exemplified by a combination of polyethylene-polypropylene, polyethylene-polyester, polyester-modified polyester, etc. Examples thereof include various fibers such as fibers; crimped fibers in which three-dimensional crimps are expressed by varying the degree of heat treatment between the front side and the back side of the fibers. In the present invention, it is preferable to use a composite fiber in which resins having different heat shrinkage rates are combined, particularly a composite fiber having a side-by-side structure, and more preferably a side-by-side structure crimped fiber made of polyester-modified polyester. . Such a crimped fiber is preferable because it is excellent in chemical resistance to the skin agent, has high productivity for expressing crimp, and is easily available.

  The heat shrinkage rate of the crimped fiber is, for example, preferably 1% or more, more preferably 5% or more, still more preferably 10% or more, and generally 50% or less, more preferably 40%. Or less and may be 30% or less. If the thermal contraction rate of the crimped fiber is within the above range, a crimped fiber having a large number of crimps and a high spring effect can be obtained after the expression of crimps.

  In order to improve the spinnability in the card machine, the number of crimps of the crimped fiber is preferably, for example, 5/25 mm or more and 25/25 mm or less before the crimp is developed. And in order to obtain the support body excellent in the elasticity, the number of crimps after crimp expression (heat treatment temperature; about 150 to 240 ° C.) is, for example, preferably 40 pieces / 25 mm or more, more preferably 50 pieces / 25 mm. More preferably, it is 60 pieces / 25 mm or more, preferably 120 pieces / 25 mm or less, more preferably 110 pieces / 25 mm or less, and further preferably 100 pieces / 25 mm or less.

  When using crimped fibers, the fineness of the crimped fibers is, for example, preferably 0.5 dtex or more, more preferably 1.4 dtex or more, preferably 7 dtex or less, more preferably 5 dtex or less. If the fineness is less than 0.5 dtex, the spinning performance in the card machine is poor, which is not preferable. If the fineness is more than 7.0 dtex, the gap in the support becomes large, and the skin agent may be easily oozed out.

  The range of the fiber length of the crimped fiber is, for example, 15 mm or more and 152 mm or less. If the fiber length is within the above range, the crimped fiber has a fiber strength that can withstand spinning in a card machine, while the obtained support has elasticity and appropriate flexibility as a support. It becomes.

As described above, in the present invention, the surface of the support 13 is smoothed by compacting such as calendering so that the reinforcing layer 11 can be easily peeled off. However, according to a study by the present inventors, when the surface of the support 13 is smoothed by compaction processing, it is a matter generally required for the support, (i) followability to the affected part of the skin patch, (Ii) It has been found that the stretchability of the support may be deteriorated (for example, an increase in stress at 50% elongation and a decrease in recovery rate at 50% elongation of the support whose surface is smoothed) etc). As a result of further intensive studies, it was found that the following points are effective in improving the stress at 50% elongation and the recovery rate at 50% elongation.
I. In order to reduce the stress at 50% elongation, it is effective to weaken the fiber entanglement condition in mechanical entanglement processing such as needle punching and water punching.
II. In order to increase the recovery rate at 50% elongation, the number of crimps developed by heat treatment increases, so it is effective to blend crimped fibers having a large thermal shrinkage rate.

  First, II will be described (the mechanical entanglement process of I will be described in detail in the section of the manufacturing method described later). In order to increase the recovery rate at 50% elongation, it is effective to blend crimped fibers having a large heat shrinkage rate as the fibers constituting the support. Since the support body contains crimped fibers having a relatively large number of crimps (that is, a large heat shrinkage rate), a stronger spring effect is exhibited, leading to an improvement in the recovery rate of the support body.

  Here, the crimped fiber having a large heat shrinkage rate is, for example, a crimped fiber having a heat shrinkage rate of 15% or more and 50% or less, and the heat shrinkage rate is more preferably 20% or more and 45% or less. Preferably they are 22% or more and 40% or less. The amount of the crimped fiber used is preferably 5% by weight or more, more preferably 10% by weight or more, still more preferably 15% by weight or more, and 90% by weight or less in 100% by weight of the support. More preferably, it is 65 weight% or less, More preferably, it is 30 weight% or less. If the amount of crimped fibers having a large heat shrinkage rate is within the above range, the recovery rate at 50% elongation can be appropriately increased.

  The support may be composed only of the above-described fiber having a large heat shrinkage rate (for example, a crimped fiber having a heat shrinkage rate of 15% to 50%), but the spring effect of the crimped fiber is too strong. Therefore, it is desirable that the support contains at least two kinds of fibers having different heat shrinkage rates. As such an aspect, for example, the support is a crimped fiber (hereinafter referred to as a first fiber) having a heat shrinkage rate of 15% or more and 50% or less, and a fiber having a heat shrinkage rate lower than that of the fiber ( Hereinafter, an embodiment including both of the second fibers) will be given. The second fiber may be a crimped fiber or a non-crimped fiber. The second fiber is preferably a crimped fiber, and the heat shrinkage rate is preferably 1% or more and less than 15%, more preferably 5% or more, and still more preferably 10% or more.

  The mixing ratio of the first fiber and the second fiber (first fiber: second fiber) is preferably 5:95 to 95: 5, more preferably 10:90 to 50:50, and still more preferably by weight ratio. 15:85 to 40:60.

  If the spring effect is excessively improved by adding a crimped fiber having a large heat shrinkage rate, and the texture of the support becomes hard or the stress becomes large, the fiber treated with a silicone oil is used for the support. It is good to mix about 1 to 30% by weight.

  The total amount of the crimped fibers is preferably 50% by weight or more, more preferably 75% by weight or more, still more preferably 90% by weight or more, more preferably in 100% by weight of the support 13. It is 95 weight% or more, Most preferably, it is 100 weight%.

  Although the kind of nonwoven fabric is not particularly limited, preferred nonwoven fabrics include, for example, wet nonwoven fabrics such as chemical bonds, thermal bonds, and water punches; dry nonwoven fabrics such as chemical bonds, thermal bonds, needle punches, and water punches; A bond nonwoven fabric etc. are mentioned. From the viewpoint of hygiene and the like, it is preferable to use a dry nonwoven fabric, more preferably a dry nonwoven fabric by a mechanical entanglement method such as a needle punch method or a water punch method. Needle punch nonwoven fabric, spunlace nonwoven fabric and the like are easy to manufacture, have moderate flexibility and air permeability, and do not use a resin such as a binder, so that the support is less irritating to the skin.

  The method for producing the support is not particularly limited, but is preferably formed by a dry method as described above. That is, the fibers used for the support are weighed and then blended, then carded using a card machine, and then wrapped with a cross wrapper. Examples of the fiber bonding method include a thermal bond method, a chemical bond method, a needle punch method, a water punch method, and the like, among which a mechanical entanglement method such as a needle punch method and a water punch method is desirable.

As described above, in order to reduce the stress at 50% elongation, it is effective to weaken the fiber entanglement conditions in mechanical entanglement processing such as needle punching and water punching. Was found (I). In the case of needle punching, the number of needles to be driven is preferably about 10 to 20% less than the number of general supports (nonwoven fabrics) to be driven. Specifically, 30 needles / cm ² or more is preferable. Preferably it is 50 / cm ² or more, more preferably 70 / cm ² or more, preferably 200 / cm ² or less, more preferably 170 / cm ² or less, still more preferably 150 / cm ^2. cm ² or less. The needle depth is preferably 3 mm or more, more preferably 5 mm or more, preferably 15 mm or less, more preferably 12 mm or less. When the number of needle punched needles is small or the needle depth is small, it becomes difficult to maintain the strength as a support, and as a result, a support with low stress and good extensibility can be obtained. However, it is not preferable because it has poor recoverability and may cause delamination of the support. On the other hand, if the number of needles to be driven is large or the needle depth is increased, the fiber entanglement becomes stronger, and a greater force is required to stretch the support, resulting in skin against human movement. There is a possibility that followability of the patch may be deteriorated.

  The needle count may be 38-42 which is usually used for the production of non-woven fabric, but in order to further reduce the exudation of the skin agent, the non-woven fabric may be produced using two or more types of needles having different counts. . Specifically, for example, if a thick count is arranged on the entrance side of the needle board (for example, No. 40) and a thin count (for example, No. 42) is arranged on the exit side, After the fibers are strongly entangled, the surface state of the support can be adjusted with a fine count needle, so that the surface state of the nonwoven fabric becomes better.

  Needle punch processing can be performed on one or both surfaces of the support surface, and from the viewpoint of suppressing the exudation of the skin agent, it is desirable that the needle punch processing is performed at least on the surface to be joined to the reinforcing layer. .

  On the other hand, the water punching process can be performed by a known method, and the execution conditions may be appropriately adjusted according to the fibers constituting the support and the characteristics of the obtained support. For example, the nozzle diameter is adjusted to 0.05 to 0.3 mm, the nozzle pitch is set to 0.3 to 5 mm, and the water pressure of the water flow ejected from the nozzle opening is adjusted to about 0.1 to 10 MPa, and one side of the support Or if it ejects 1-5 times from both surfaces, the fiber of a fiber web can be appropriately entangled with the water flow ejected from a nozzle opening.

  In the present invention, both needle punching and water punching can be performed. For example, the fiber web may be subjected to needle punching to such an extent that the entanglement due to water flow is not hindered, the fibers are slightly entangled to increase the strength of the nonwoven fabric, and then water punching is performed. According to such a method, since the fibers are entangled in advance by needle punching, it is possible to prevent wrinkles from entering into the nonwoven fabric during the water punching process, or to make the nonwoven fabric thin by excessive water jetting. It can be suppressed, or the number of entangled fibers can be increased, thereby preventing the occurrence of crimping during heat treatment described later.

  When the support contains latent crimped fibers, after obtaining the nonwoven fabric by the above-described method, heat treatment is further performed to develop crimps and shrink the web constituting the nonwoven fabric. A crimped body is developed and the web contracts to obtain a stretchable support. The heat treatment temperature is not particularly limited as long as the fiber can be crimped, and may be appropriately adjusted according to the melting point of the resin constituting the fiber, the basis weight of the fiber web, the thickness, etc. If the temperature is too low, crimps may not be sufficiently developed. Therefore, the temperature is usually preferably 100 ° C or higher, more preferably 110 ° C or higher, and further preferably 130 ° C or higher. On the other hand, if the heat treatment temperature is too high, the crimps are formed finely and the texture of the nonwoven fabric becomes hard, and there is a concern that the stretchability will deteriorate and the fibers will melt. It is desirable to set the temperature lower than the starting temperature. Specifically, the temperature is preferably 200 ° C. or lower, more preferably 190 ° C. or lower, and still more preferably 180 ° C. or lower.

  For the same reason, the heat treatment time is preferably, for example, 5 seconds or more, more preferably 10 seconds or more, preferably 2 minutes or less, more preferably 1 minute or less.

  The reinforcing layer side surface of the support used in the present invention is subjected to consolidation for the purpose of smoothing the surface of the support and suppressing fuzz when peeling the reinforcing layer. The compacting is preferable because a support having a good appearance can be obtained. The consolidation process is not particularly limited as long as it is a method capable of pressing a nonwoven fabric produced from a heated metal plate. For example, since the consolidation process can be carried out continuously, a nonwoven fabric produced between a pair of rolls is passed through and heated. A calendering process in which the surface of the nonwoven fabric is pressed with a formed metal roll is preferred. The metal plate (metal roll) for compacting the nonwoven fabric preferably has a smooth surface. The consolidation process is performed after the nonwoven fabric is formed (when the fibers are latent crimped fibers, after heat treatment), and the thickness of the nonwoven fabric can be adjusted by calendering. Consolidation may be performed not only on the reinforcing layer side surface of the support, but also on both the reinforcing layer side surface and the skin agent side surface.

  The heating temperature of the metal plate (metal roll) is not particularly limited as long as it is lower than the melting start temperature of the fibers constituting the support, for example, preferably 30 ° C or higher, more preferably 50 ° C or higher, It is preferably 180 ° C. or lower, more preferably 150 ° C. or lower. If the heating temperature is within the above range, the fibers can be prevented from being thermally fused, and the stress during elongation of the support can be kept low. Moreover, the roll interval and the linear pressure between the heating rolls in the calendering process may be appropriately adjusted according to the desired thickness and the feeling of use.

The basis weight of the support is, for example, preferably 50 g / m ² or more, more preferably 60 g / m ² or more, still more preferably 70 g / m ² or more, and preferably 200 g / m ² or less, more preferably It is 170 g / m ² or less, more preferably 150 g / m ² or less. When the basis weight of the support is less than 50 g / m ² , the skin agent tends to ooze out, and it may be difficult to maintain the strength as the support, and when the skin patch is stretched, the skin patch Is unfavorable because it may become thin and cause a squeeze. On the other hand, if the basis weight of the support is greater than 200 g / m ² , the air permeability of the support will be low, and the support will feel stuffy at the time of use, or the support will be heavy and poor in flexibility. When attached, it may be uncomfortable for the user, which is not preferable.

  The thickness of the support is, for example, preferably 0.5 mm or more, more preferably 0.6 mm or more, still more preferably 0.7 mm or more, preferably 2 mm or less, more preferably 1.5 mm or less. Yes, more preferably 1.2 mm or less. When the thickness of the support is less than 0.5 mm, the support becomes thin and the skin agent may ooze out to the back surface of the support, which is not preferable. On the other hand, when the thickness of the support exceeds 2 mm, the skin patch becomes thick, the skin patch is difficult to follow along the affected area, and the usability is deteriorated. Further, the thick skin patch may reduce the number of skin patches that can be accommodated in the packaging box, which is not preferable from the viewpoint of sales efficiency.

The density of the support is not particularly limited as long as the basis weight and thickness of the support are within the above-mentioned ranges, but if the density of the support is too low, the texture of the skin patch surface is deteriorated. If the density of the support is too high, the fibers contained in the support (for example, crimped fibers) may increase the contraction force of the support, which may reduce the stretchability of the support. . Therefore the density of the support is, for example, 0.05 g / cm ³ or more, more preferably 0.07 g / cm ³ or more, further preferably 0.09 g / cm ³ or more, 0.2 g / cm ³ or less is preferable, more preferably 0.17 g / cm ³ or less, and still more preferably 0.15 g / cm ³ or less. If the density of the support is within the above range, it is preferable because the exudation of the skin agent can be suppressed while enhancing the adhesive force between the support and the skin agent. On the other hand, when it is lower than 0.05 g / cm ³ , the skin agent easily penetrates into the support, and the adhesion between the support and the skin agent is improved. However, since the density of the support is low, the skin agent oozes out. May become noticeable. On the other hand, when the density is higher than 0.2 g / cm ^3, it becomes difficult for the skin agent to penetrate into the support, and thus the adhesion between the support and the skin agent becomes weak. As a result, the adhesion between the support and the skin agent is reduced. As a result, the peel strength between the support and the skin agent may be lower than the peel strength between the support and the reinforcing layer, which is not preferable.

Also, the air flow rate of the support is not particularly limited. However, if the air flow rate of the support is too low, the skin patch is applied to the body and then the skin and the support are used. It is easy to give discomfort to the person. In particular, the thermal coolant uses the cooling effect due to the heat of vaporization when moisture contained in a large amount in the skin agent passes through the support and is released to the atmosphere, but the air flow rate of the support is low. Then, it becomes difficult for moisture contained in the skin preparation to pass through the support, and as a result, the desired cooling effect may not be exhibited. From such a viewpoint, the air flow rate of the support is preferably, for example, 50 cc / cm ² · sec or more.

  The direction in the nonwoven fabric is generally referred to as the “longitudinal direction” or the “MD direction” in the flow direction or the supply direction of the nonwoven fabric in the production process, depending on the direction of the nonwoven fabric in the production process. It is called “lateral direction” or “CD direction”. In general, nonwoven fabrics tend to have high stretchability in the “lateral direction” or “CD direction”. Below, for the sake of convenience, the terms “longitudinal direction” and “lateral direction” will be used to describe the characteristics of the nonwoven fabric.

The stress at 50% elongation in the longitudinal direction of the support is preferably 0.5 N / 5 cm or more, more preferably 1 N / 5 cm or more, still more preferably 2 N / 5 cm or more, and preferably 50 N / 5 cm or less. Preferably it is 20N / 5cm or less, More preferably, it is 10N / 5cm or less, and even if smoothing processing is performed on the support surface, it is equivalent to that before smoothing processing by adjusting the entanglement conditions ( For example, it can be set to 4.2 N / 5 cm or less. Further, the stress at 50% elongation in the transverse direction of the support is preferably 0.2 N / 5 cm or more, more preferably 0.3 N / 5 cm or more, still more preferably 0.4 N / 5 cm or more, and 30 N / 5 cm. The following is preferable, more preferably 15 N / 5 cm or less, further preferably 5 N / 5 cm or less, and by adjusting the entanglement conditions, it is equivalent to that before smoothing (for example, 1 N / 5 cm or less). You can also If the stress at 50% elongation of the support is below the lower limit value, there is little resistance or crispness when the skin patch is applied to the body, but in the process of forming the skin preparation or reinforcing layer on the support, Since the dimensional stability of a body is bad and it becomes impossible to maintain a nonwoven fabric form, it is unpreferable in terms of workability. Further, if the stress at 50% elongation of the support exceeds the upper limit, when the skin patch is affixed to the body, the followability to the body is poor and the user may feel uncomfortable.
As described above, the stretchability of the nonwoven fabric tends to be high in the lateral direction, and the ratio of the stress at the time of 50% elongation in the longitudinal direction and the transverse direction (longitudinal / lateral direction) is usually 1.1 to 6, more Preferably it is 2-5.

The recovery rate at 50% elongation in the longitudinal direction of the support is preferably 20% or more, more preferably 30% or more, still more preferably 40% or more, and the surface of the support is smoothened. Even if it is applied, by using two or more types of crimped fibers having different heat shrinkage rates, it can be made equivalent (for example, 45% or more) before smoothing. The recovery rate at 50% elongation in the transverse direction of the support is preferably 20% or more, more preferably 50% or more, and still more preferably 65% or more, and crimped fibers having different heat shrinkage rates. By using 2 or more types, it can be made equivalent (for example, 75% or more) before smoothing. Moreover, although an upper limit is not specifically limited, Both the vertical direction and the horizontal direction are usually 95% or less, may be 85% or less, and may be 80% or less. If the 50% elongation recovery rate is within the above range, the recovery after stretching the skin patch is good, and it is preferable that sagging and wrinkles are less likely to occur in the skin agent.
Further, as described above, the stretchability of the nonwoven fabric tends to be high in the transverse direction, and the ratio of the recovery rate at 50% elongation in the longitudinal direction and the transverse direction (longitudinal / lateral direction) is usually 0.1 to 0.95. More preferably, it is 0.4 to 0.8.

  The support may be a single layer nonwoven fabric or a laminate of two or more nonwoven fabrics. In the case where the support is made of a laminate of two or more nonwoven fabrics, for example, as disclosed in JP 2012-237073 A, a hydrophilic fiber layer that allows easy penetration of the skin agent, and the skin agent penetrates. It is preferable to use a laminated nonwoven fabric in which a difficult water-repellent fiber layer is entangled by a mechanical entanglement method.

2. Reinforcing layer For the reinforcing layer 11, a firm material may be used in order to maintain the rigidity of the skin patch 10. Examples of the reinforcing layer 11 include films, nonwoven fabrics, paper, cloth, and various sheet-like materials that contain a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, and nylon as raw materials. The thermoplastic resin may be used alone or in combination of two or more.

  The thickness of the reinforcing layer is, for example, 10 μm or more, more preferably 20 μm or more, further preferably 30 μm or more, preferably 1000 μm or less, more preferably 250 μm or less, and further preferably 100 μm or less. . If the thickness of the reinforcing layer is lower than the lower limit value, the reinforcing layer is too thin to impart adequate rigidity to the skin patch, and when the skin patch is applied, it is attached or wrinkled. Since there is a possibility, it is not preferable. On the other hand, if the upper limit is exceeded, the texture of the skin patch becomes hard and it may be difficult to apply to the body. Further, the thick skin patch may reduce the number of skin patches that can be accommodated in the packaging box, which is not preferable from the viewpoint of sales efficiency.

  Further, from the viewpoint of the balance of the thickness of the reinforcing layer and the support, the thickness of the reinforcing layer is, for example, preferably 1% or more of the thickness of the support, more preferably 5% or more, and 30% or less. Preferably, it is 15% or less, more preferably 10% or less.

  The reinforcing layer 11 adjusts the peel strength so that it can be peeled off from the support 13. If the reinforcing layer 11 can be peeled from the support 13, only the reinforcing layer 11 can be peeled after the skin patch 10 is bonded to the skin. Thereby, the elasticity and breathability of skin patch 10 can be maintained, and uncomfortable feelings such as discomfort and stuffiness occurring when skin patch 10 is used can be reduced. The peel strength between the reinforcing layer 11 and the support 13 is such that the skin patch 10 is not peeled off during transportation or removal from the packaging bag before use of the skin patch 10, and the skin patch 10 is applied to the skin. After attaching, it is sufficient that only the reinforcing layer 11 can be easily peeled off by hand.

  The surface of the reinforcing layer may be smooth, or unevenness may exist on a part or the entire surface of the reinforcing layer by embossing or the like. If the surface of the reinforcing layer is made smooth, it becomes easy to print (for example, characters, patterns, coloring) on the surface. Therefore, as shown in FIG. 2, according to the present invention, by laminating the reinforcing layer 11, the support side surface of the skin patch 10, which has conventionally been of low utility value, can be used as an advertisement surface, or a skin patch. It becomes possible to improve the design value of the surface of the support 10 on the support 10 side and increase the commercial value of the skin patch 10. Furthermore, if the lot number is printed, it becomes easy to manage the amount relating to the shipment, sale, etc. of the skin patch 10. In addition, in the unlikely event that there is a defect in the skin patch 10, a follow-up survey can be performed promptly, so that a prompt response can be made. On the other hand, if unevenness exists on the surface of the reinforcing layer, the unevenness functions as an anti-slip when the skin patch 10 is applied to the skin, so that the skin patch 10 is easily applied to the body. Further, when the reinforcing layer is peeled off, the unevenness is marked, so that the user can easily recognize the reinforcing layer and the reinforcing layer can be easily peeled off.

  According to the investigation by the present inventor, it was found that when the use of the skin patch was continued after forgetting to peel off the reinforcing layer, the reinforcing layer hinders ventilation and gives the wearer an unpleasant feeling such as swelling. In addition, if the reinforcing layer remains, the stretchability of the support is not sufficiently exhibited, the followability of the skin patch is deteriorated, and in some cases, the skin patch may be peeled off from the affected area. In particular, it is assumed that the problem of forgetting to peel off becomes prominent at the site where the user cannot directly see the affected part, such as the waist and back. Therefore, it is preferable that the reinforcing layer is subjected to a process for preventing peeling. For example, a printing process that prints a notice of forgetting to peel off on the surface of the reinforcing layer; an embossing process that makes the reinforcing layer uneven so that the reinforcing layer can be recognized only with the sense of the hand; For example, a round, square, or star-shaped drilling process for facilitating; a cutting process for cutting out part of the end portion of the reinforcing layer; a tack process;

  The reinforcing layer may have a single layer structure or a multilayer structure of two or more layers. In addition, the reinforcing layer can be subjected to various functional processing, for example, deodorizing processing with fragrances, deodorants, etc., coloring processing with pigments, dyes, etc. to further increase the commercial value of the skin patch. Good.

  The example of a change of a reinforcement layer is shown to embodiment 2-4. The form of the reinforcing layer is not limited to Embodiments 1 to 4.

<Embodiment 2>
FIG. 3 is a schematic perspective view showing an example of the skin patch 10 when the skin patch 10 has a non-fixed portion 21 that is a portion where the reinforcing layer 11 and the support 13 are not fixed. By forming the non-fixed part 21, the non-fixed part 21 can be used as a peeling start part of the reinforcing layer 11. Therefore, after the skin patch 10 is bonded to the skin, the reinforcing layer 11 is easily peeled off. be able to. Although the formation position of the non-fixing part 21 is not specifically limited, For example, it is good to form suitably in the corner of the skin patch 10; Further, the reinforcing layer 11 can be made longer than the support 13, and an excess portion of the reinforcing layer 11 other than the joint surface between the reinforcing layer 11 and the support 13 can be used as the non-fixed portion 21. Further, a plurality of non-fixed portions 21 can be formed on the skin patch 10 such as two opposite corners of the skin patch 10; both ends of the skin patch 10;

<Embodiment 3>
FIG. 4 is a schematic perspective view showing an example of the skin patch 10 having two separable reinforcing layers 11. Compared to the case where the reinforcing layer 11 is formed of one sheet, by forming the reinforcing layer 11 from a plurality of individual layers, the stress applied to the skin patch 10 can be reduced when the reinforcing layer 11 is peeled off, The reinforcing layer 11 can be peeled off without peeling off the skin patch 10 fixed to the skin. The reinforcing layer 11 may be a structure in which two reinforcing layers 11 are arranged side by side, and each of them is formed on a support 13, and is supported in a state where one reinforcing layer 11 is cut and separated into two. It may be formed on the body 13. The number of reinforcing layers 11 is not limited to two, and the number may be increased to three or four.

<Embodiment 4>
FIG. 5 shows a skin patch in the case of having two separable reinforcing layers 11 and the skin patch 10 has an overlapping portion 22 where a plurality of reinforcing layers 11 overlap each other as the non-fixed portion 21. 10 shows an example. As shown in FIG. 5, by providing the overlapping portion 22, the overlapping portion 22 can be used as a peeling start portion of the reinforcing layer 11. Therefore, after the skin patch 10 is bonded to the skin, the reinforcing layer 11 is attached to the skin. It can be easily peeled off.

3. Adhesive layer The reinforcing layer 11 is preferably detachably fixed to the support 13 via the adhesive layer 12. By fixing the reinforcing layer 11 via the support 13 and the adhesive layer 12, the problem that the reinforcing layer 11 is peeled off from the support 13 before using the skin patch 10 can be suppressed. The adhesive layer 12 only needs to be able to fix the reinforcing layer 11 and the support 13; an adhesive layer via an adhesive / adhesive; an adhesive layer via an electric attractive force such as static electricity; press adhesion, thermal adhesion, etc. Various adhesive layers such as a physical adhesive layer; These adhesion methods may be combined so that the reinforcing layer 11 can be easily peeled off from the support 13. For example, it is preferable to further press-bond after forming the reinforcing layer 11 on the support 13 via an adhesive, since the adhesive force between the support 13 and the reinforcing layer 11 can be increased.

  In order to achieve the desired peel strength, the adhesive / adhesive of the adhesive layer is a polyacrylate resin, a synthetic rubber resin, a vinyl acetate resin, a polyester resin in consideration of compatibility with the skin agent. Using a resin selected from resins and the like, the reinforcing layer or the support layer may be formed to have a thickness of about 1 to 50 μm.

4). Skin agent It is preferable to adopt a skin agent that can fix the drug to the skin surface at room temperature for a long time. As the components constituting the skin agent, an external anti-inflammatory analgesic agent, a heat-cooling agent, a leg / ankle General-purpose drugs used for cosmetic patches, cosmetic gel sheets and the like can be selected.

  Skin agents usually contain thickeners, wetting agents, water, fillers, and other ingredients as needed, solubilizing agents, absorption promoters, medicinal aids, cosmetics, stabilizers, emulsifiers, etc. The

  Examples of the thickener include guar gum, locust bean gum, carrageenan, alginic acid, sodium alginate, agar, gum arabic, tragacanth gum, karaya gum, pectin, starch and other microbial systems, xanthan gum, acacia gum and other microbial systems, gelatin, Natural polymers such as animal systems such as collagen; semi-synthetic polymers such as celluloses such as methylcellulose, ethylcellulose, hydroxyethylcellulose, sodium carboxymethylcellulose, and starches such as soluble starch, carboxymethyl starch, and dialdehyde starch; polyvinyl alcohol, Vinyl type such as polyvinyl pyrrolidone and polyvinyl methacrylate, acrylic type such as polyacrylic acid and sodium polyacrylate, other polyethylene oxide, methyl vinyl Water-soluble polymers of a synthetic polymer such as ether / maleic anhydride copolymer and the like are suitably used.

  Examples of the wetting agent include polyhydric alcohols such as glycerin, propylene glycol, and sorbital. Examples of the filler include kaolin, zinc oxide, talc, bentonite, aluminum silicate, titanium oxide, and aluminum metasilicate. , Calcium sulfate, calcium phosphate and the like.

  Examples of the medicinal aid include salicylic acid glycol, methyl salicylate, L-menthol, thymol, mint oil, limonene, nonyl acid vanillylamide, capsicum extract and the like. Examples of the solubilizer or absorption promoter include propylene carbonate, crotamiton, diisopropyl adipate and the like.

  In addition to the above, depending on the application, the skin preparation includes, for example, a preservative such as paraben; anionic, cationic and nonionic surfactants; metals such as aluminum chloride, dry aluminum hydroxide gel, dihydroxyaluminum aminoacetate Aluminum cross-linking agents; oils such as Jacoba oil and castor oil; chelating agents such as EDTA; pH regulators such as malic acid, tartaric acid and diisopropylamine; alcohols such as ethanol; moisturizing agents such as hyaluronic acid, aloe extract, royal jelly extract and urea Agent; In addition, a fragrance or a pigment may be added.

5. Skin Agent Protective Layer In the present invention, the skin agent protective layer 15 is not particularly limited as long as it is a layer that protects the skin agent, and preferably includes a film made of a thermoplastic resin. Examples of the thermoplastic resin include polyethylene terephthalate, polypropylene, polyethylene, nylon, and vinyl chloride.

6). Method for Producing Skin Patch The method for producing the skin patch 10 according to the present invention is not particularly limited as long as the reinforcing layer 11 is formed on the support 13. Forming the reinforcing layer 11 in the direction, and then forming (coating) the skin agent 14 on the other side of the support 13; (production method ii) forming the skin agent 14 on one side of the support 13; The method of forming the reinforcement layer 11 in the other surface of the support body 13; In the present invention, it is desirable to manufacture the skin patch 10 based on the production method i in consideration of the hygiene of the skin agent 14 because the manufacture of the skin patch 10 is simple.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, but may be appropriately modified within a range that can meet the purpose described above and below. Of course, it is possible to implement them, and they are all included in the technical scope of the present invention.

The characteristic measurement and performance evaluation methods of the skin patches obtained by the above Examples and Comparative Examples are as follows.
(1) Substrate weight; according to JIS L1913 6.2 method (2) Thickness of support; according to JIS L1913 6.1B method (3) Density of support; (4) Heat shrinkage rate: A nonwoven fabric having a basis weight of 60 g / m ² is formed by a needle punch method, and a sample piece having a width of 300 mm and a length of 300 mm is collected. The vertical dimension L ₁ (mm) after being suspended in a thermostat having an actual temperature of 150 ° C. so that the vertical direction is vertical and heat-treated for 40 seconds is measured.
Thermal contraction rate (%) = (300−L ₁ ) / 300 × 100
(5) Number of crimps after crimping; after heat treatment at 170 ° C. × 90 sec, the number of crimps per 25 mm is visually measured.

(6) Stress at 50% elongation of the support; a test piece having a width of 50 mm and a length of 300 mm is taken from the support sample. The test piece is attached to a tensile tester with a spacing of 200 mm. The stress at the time of pulling 100 mm at a pulling speed of 200 mm / min is measured.

(7) Recovery rate at 50% elongation of the support; a test piece having a width of 50 mm and a length of 300 mm is collected from the support sample. The test piece is attached to a tensile tester with a spacing of 200 mm. Pull 100 mm at a pulling speed of 200 mm / min and return to the origin at the same speed. At this time, assuming that the distance from the origin at which the tensile stress of the test piece becomes 0 is L ₀ (mm), the recovery rate at 50% elongation is calculated by the following formula.
Recovery rate at 50% extension (%) = 100−L ₀

(8) Peel strength of each layer of skin patch; Peel strength of each layer is A: skin / dermatological agent, B: support / reinforcing layer, C: skin agent / dermatological protective layer, D: support / skin Agent, E: Measures five types between the layers of the support.
A specimen having a width of 25 mm and a length of 100 mm is taken from the skin patch sample. Peel 25 mm from one side of the short side of the sample, fix one end of the peeled test piece to one chuck of the tensile tester, and fix the other end to the other chuck. B: In the case of skin / dermatological agent, the skin to which the skin adhesive is applied is matched with one chuck position. Next, the tester is operated at 100 mm / min, and the average value of the 50 mm long strength peeled is defined as the peel strength.
The peel strength was comprehensively evaluated according to the following criteria.
○: Peel strength is arranged in the order of D>A>B> C ×: Peel strength is arranged in the order other than the above

(9) Ease of application of skin patch; Ten subjects were subjected to a sensory test on the ease of application when the skin patch was applied to the body. When the test subject applied the skin patch to the shoulder, elbow, knee, or waist, the skin patch was visually observed to see if it would become a wrinkle or a skin patch, and the number and skin of the wrinkles occurred We counted the number of people who joined together on the surface.

(10) Support surface smoothness after peeling of the reinforcing layer; the fluffing state of the surface of the supporting member when the reinforcing layer is peeled is evaluated by visual observation.
○: There is no fluff like the surface of the conventional skin patch without a reinforcing layer. Δ: Some fluff is observed from the surface of the conventional skin patch without a reinforcing layer. ×: The conventional skin patch without a reinforcing layer. More fuzz than the surface

(11) Adhesive residue on the support surface after peeling of the reinforcing layer; whether the adhesive of the adhesive layer remains on the support surface when the reinforcing layer is peeled off is visually evaluated.
○: No adhesive remains △: Adhesive remains slightly ×: Adhesive remains

(12) Feeling of use of skin patch; sensory evaluation of followability to body movement and feeling of stuffiness after skin patch is applied to the affected area.
◎: Same comfort as a conventional skin patch without a reinforcing layer ○: Inferior to a conventional skin patch without a reinforcing layer, but can be used comfortably ○ ~ ◎: Comfort between the above ○ and ◎ It is ×: Discomfort occurs due to poor followability and stuffiness

(13) Exudation of skin agent: Six skin patches are stacked and packed in a bag, a 1 kg weight is placed for 24 hours, and the exudation of the skin adhesive at the bottom to the support surface is visually evaluated.
◎: No seepage is seen ○: No seepage is seen △: Seepage is seen

<Powder agent>
About a poultice, Examples 1-4, Comparative Examples 1-3, and Reference Example 1 are described below.

Example 1
Latent crimped polyester fibers having a fineness of 2.2 dtex and a fiber length of 51 mm (fiber web heat shrinkage 14%, number of crimps after heat treatment 70 cores / 25 mm) 100% by weight of fiber web are laminated and the conditions shown in the table Then, a needle punching process was performed, and heat treatment was performed for 30 seconds through a hot air circulation dryer maintained at 170 ° C. Then, it was passed between iron rolls heated to 70 ° C., and calendered to obtain a cataplasm support. Each characteristic of the support is shown in the table.
Reinforcement consisting of a 60 μm thick polyethylene film with a synthetic rubber adhesive (thickness 5 μm) applied as an adhesive layer on one side of the support, printed with precautions to prevent forgetting to peel off, and uneven embossing on the surface The layers were laminated and press bonded. Subsequently, a skin agent (including glycol salicylate, L-menthol, sodium polyacrylate, polyvinyl alcohol, glycerin, aluminum silicate, titanium oxide, and gelatin) is formed on the other surface of the support, and a polypropylene film is formed on the surface on which the skin agent is formed. A skin patch protecting layer was formed to obtain a skin patch to be used as a cataplasm.

Example 2
The fiber web constituting the support is composed of 80% by weight of a crimped polyester fiber having a fineness of 2.2 dtex and a fiber length of 51 mm (fiber web heat shrinkage of 14%) and a latent crimp of a fineness of 2.2 dtex and a fiber length of 51 mm. A skin patch was produced in the same manner as in Example 1 except that the fiber web was made by blending 20% polyester fiber (fiber web heat shrinkage 26%, number of crimps 80 ° / 25 mm after heat treatment).

Example 3
A skin patch was produced in the same manner as in Example 1 except that the needle punching was performed with a number of driven needles of 95 / cm ² and a needle depth of 8 mm.

Example 4
The fiber web is composed of 80% by weight of a latently crimpable polyester fiber having a fineness of 2.2 dtex and a fiber length of 51 mm (fiber web heat shrinkage 14%), and a latently crimpable polyester fiber having a fineness of 2.2 dtex and a fiber length of 51 mm (fiber web). A skin patch was produced in the same manner as in Example 1 except that a fiber web blended with 20% heat shrinkage (26%) and needle punching was performed with a number of needles of 95 / cm ² and a needle depth of 8 mm.

Comparative Example 1
A skin patch was produced in the same manner as in Example 1 except that the reinforcing layer was not formed.

Comparative Example 2
A skin patch was produced in the same manner as in Example 1 except that the thickness of the reinforcing layer was 5 μm.

Comparative Example 3
A skin patch was produced in the same manner as in Example 1 except that calendaring was not performed.

Reference example 1
A skin patch was produced in the same manner as in Example 1 except that the reinforcing layer was not printed with a precautionary note for preventing forgetting to peel off and the embossing was performed.

Since the skin patches obtained in Examples 1 to 4 are provided with a reinforcing layer having a sufficient thickness on the surface of the support, no wrinkles or attachment occurs when the skin patches are applied to the body. It was good. Further, since the surface of the support was calendered, there was no fuzz when the reinforcing layer was peeled off, and the feeling of use was good. In particular, Example 2 uses crimped fibers having a heat shrinkage rate of 26%, so that the recovery rate at 50% elongation was greatly improved compared to that of Example 1. In Example 3, since the needle punching conditions are weakened, the stress at 50% elongation is lower than that in Example 1, and the support has a soft texture. In Example 4, a crimped fiber having a heat shrinkage rate of 26% was used, and the needle punch condition for the support was weak, so that a support excellent in stretchability was obtained. Therefore, the usability of the skin patch was very good.
On the other hand, since the skin patch of Comparative Example 1 is not provided with a reinforcing layer, wrinkles and adhesions occur when the skin patch is applied to the body. Further, the skin patch of Comparative Example 2 had a reinforcing layer as thin as 5 μm, so that a sufficient reinforcing effect was not exhibited, and wrinkles and adhesion occurred when the skin patch was applied to the body. Furthermore, since the skin patch of Comparative Example 3 is not calendered on the support, when the reinforcing layer is peeled off, the fibers contained in the support are pulled by the reinforcing layer and the surface becomes fluffy, and the surface of the support Was not smooth, and there was a problem that the adhesive remained after the reinforcing layer was peeled off.
The skin patch of Reference Example 1 has no problem in terms of the performance of the skin patch, but the user peeled off the reinforcing layer because the surface of the reinforcing layer was not printed with a precautionary note and embossing. If you use it with the reinforcing layer attached, it will become stuffy and the feeling of use will worsen.

  The skin patch according to the present invention is an external anti-inflammatory analgesic such as various sheets used by being applied to the skin, for example, a poultice (including water in the base), a plaster (not including water in the base); Various water-containing gel sheets to be affixed to the skin such as a face mask or eye sheet coated with a heat-cooling agent, leg / wax patch, gel-like cosmetic liquid, and the like can be used as appropriate.

DESCRIPTION OF SYMBOLS 10 Skin patch 11 Reinforcement layer 12 Adhesive layer 13 Support body 14 Skin agent 15 Skin agent protective layer 21 Non-fixed part 22 Overlapping part

Claims (6)

A support made of non-woven fabric;
A skin agent held on one side of the support;
Having a reinforcing layer having a thickness of 10 μm or more formed on the other surface so as to be peelable;
A skin patch, wherein the reinforcing layer side surface of the nonwoven fabric is smoothed.   The skin patch according to claim 1, wherein the support comprises at least two types of crimped fibers having different heat shrinkage rates. The stress at 50% elongation in the longitudinal direction of the support is 0.5 N / 5 cm or more and 50 N / 5 cm or less, and the stress at 50% elongation in the transverse direction is 0.2 N / 5 cm or more and 30 N / 5 cm or less,
The recovery rate at 50% elongation in the longitudinal direction of the support is 20% or more and 95% or less, and the recovery rate at 50% elongation in the transverse direction of the support is 20% or more and 95% or less. The skin patch described in 1.   The skin patch according to any one of claims 1 to 3, wherein the surface of the reinforcing layer is subjected to a process for preventing peeling.   The skin patch according to any one of claims 1 to 4, wherein the reinforcing layer side surface of the support is smoothed by calendering with a heated metal roll.   The skin patch according to any one of claims 1 to 5, which is used for external antiphlogistic analgesics.