JP5854459B2 - Base material for patch - Google Patents

Description

  The present invention relates to a base material for a patch that can be applied to a patch for external use by applying a non-hydrated plaster containing a medicinal component.

  It has been proposed to increase the efficacy of the medicinal component by causing the base material of the external patch to generate heat (Patent Document 1). More specifically, “a fiber structure formed by adhering highly hygroscopic fine particles and having a maximum temperature increase at the time of moisture absorption and / or water absorption of 3 ° C. or more” has been proposed. . However, there are many cases where external patches are applied to bends, such as those applied to joints such as elbows, knees, and shoulders. However, since this heat-adhesive cloth material is not extensible, this heat-adhesive cloth material is used. However, the externally applied patches have no extensibility, and are easily peeled off during use, and have a problem that the feeling of sticking is bad, such as stretching the skin. Therefore, there is also an idea that high crimped fibers are mixed in order to impart extensibility to the heat-bonded cloth material. However, even if high crimped fibers are mixed, in Patent Document 1, basically a high hygroscopic property is used. Since a binder is used for adhering the fine particles, not only the highly hygroscopic fine particles but also the highly crimped fibers are bonded and fixed by the binder, and sufficient extensibility cannot be exhibited.

JP 2003-93427 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide a patch base material having both extensibility and heat generation performance.

The invention according to claim 1 of the present invention is a base material for a patch comprising a non-woven fabric in which a hygroscopic fiber having a moisture content of 20% or more and a latent crimp fiber in which crimps are manifested. A patch base material characterized in that the temperature rise after 2 minutes is 2 ° C. or more, and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. ”

  The invention according to claim 1 of the present invention includes a hygroscopic fiber having a moisture content of 20% or more, the hygroscopic fiber generates heat during moisture absorption, and the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more. Excellent heat generation performance. In addition, it includes a latently-crimped fiber in which crimps are manifested (hereinafter sometimes referred to as “crimp-seen fibers”), and the stress at 50% elongation in at least one direction is as small as 5 N / 50 mm width or less. It is excellent in extensibility, which can stretch the crimp of the crimp-exposed fiber by force. Therefore, it can be expected to increase the efficacy of the medicinal component, and an external patch can be formed that is difficult to peel off during use and has an excellent feeling of sticking.

  The base material for a patch of the present invention contains hygroscopic fibers having a moisture content of 20% or more so that excellent heat generation performance can be exhibited by absorbing moisture. Basically, the higher the moisture content, the easier it is to absorb moisture and the greater the amount of heat generated, so the moisture content is preferably 25% or more, more preferably 30% or more.

This “moisture content” means the official moisture content, and when not known as the official moisture content, it means a value calculated from the following equation.
Moisture content (%) = [(W−W ′) / W ′] × 100
Here, W means the mass (g) of the fiber in an environment of a temperature of 20 ° C. and a humidity of 65% RH, and W ′ means the mass (g) when the fiber is completely dry. In addition, the mass of the fiber in the environment of temperature 20 degreeC and humidity 65% RH means the mass when a fiber is left to stand in the environment of temperature 20 degreeC and humidity 65% RH, and becomes a fixed mass, and fiber The mass at the time of absolute drying means the mass when the fiber is left in a dryer set at 105 ° C. and becomes a constant mass.

  As this hygroscopic fiber, the fiber containing a polyacrylate crosslinked body can be mentioned, for example. More specifically, Ax (registered trademark, official moisture content: 20%), Dismel (registered trademark, official moisture content: 20%), Moiscare (registered trademark, official moisture content: 35%), Bel Oasis (registered trademark) , Official moisture content: 35%), sunburner (registered trademark, official moisture content: 35%), dry vector (registered trademark, official moisture content: 35%), breath thermo (registered trademark, official moisture content: 35%), etc. Can be used. In addition, the hygroscopic fiber may be one type or two or more types may be mixed.

  The fineness of the hygroscopic fiber is not particularly limited, but the finer surface area is preferably 6.6 dtex or less because the larger surface area is easier to absorb moisture faster and the heat generation performance is better, and the fineness is preferably 6.6 dtex or less. It is more preferable that On the other hand, the lower limit of the fineness is not particularly limited, but hygroscopic fibers generally have a tendency to decrease in strength, so that it is preferably 0.5 dtex or more, and more preferably 0.8 dtex or more.

In addition, when two types of hygroscopic fibers having different fineness are included, the average fineness calculated by the following formula is preferably within the fineness range. Further, when three or more types of hygroscopic fibers having different finenesses are included, it is preferable that the value calculated in the same manner is within the fineness range.
Fav = 1 / {(Pa / 100) / Fa + (Pb / 100) / Fb}
Here, Fav is the average fineness (unit: dtex), Pa is the mass ratio (unit: mass%) of one hygroscopic fiber A in the patch base material, and Fa is the fineness of hygroscopic fiber A (unit: dtex). , Pb means the mass ratio (unit: mass%) of the other hygroscopic fiber B in the patch base material, and Fb means the fineness (unit: dtex) of the hygroscopic fiber B, respectively.

  Further, the fiber length of the hygroscopic fiber is not particularly limited. For example, when the base material for a patch is made of a dry nonwoven fabric, the fiber length is 70 mm or less so that the uniformity of the texture is excellent. Preferably, it is 55 mm or less. On the other hand, it is preferably 25 mm or more, and more preferably 30 mm or more so that sufficient strength can be maintained as a base material for a patch.

  The amount of the hygroscopic fiber is not particularly limited as long as the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more, but it accounts for 15 mass% or more of the entire patch base material. It is preferable that it occupies 20 mass% or more. On the other hand, since the base material for a patch contains crimped fibers so that the extensibility is excellent, it is preferably 35 mass% or less of the whole base material for patches because of the balance with the crimped fibers. More preferably, it is 30 mass% or less.

  The base material for a patch of the present invention has stretchability, can cope with the movement of the bent portion and / or the unevenness of the skin, is difficult to peel off from the skin, and has excellent crimp feeling so as to have a crimped manifestation fiber. Is included.

  Examples of the latent crimped fiber before the manifestation of crimp of the crimp-exposed fiber include, for example, a composite fiber in which a plurality of resins having different heat shrinkage rates are combined, and a fiber having a specific heat history applied to a part of the fiber. Can be mentioned. As the former composite fiber, one having an eccentric core-sheath structure or a side-by-side structure having a cross-sectional shape can be suitably used, and as the latent crimped fiber subjected to the latter thermal history, for example, polyester, polyamide, etc. It is possible to use a fiber that is made to pass through one side of a fiber made of a thermoplastic resin while being applied to a hot blade or the like. Among these, a composite fiber having a cross-sectional shape of a side-by-side or an eccentric core-sheath structure in which a plurality of resins having different heat shrinkage rates are combined exhibits crimps by performing heat treatment, and spiral-shaped wrinkles. It is suitable because it is a crimp-crimped fiber having crimps and is excellent in stretchability.

  Suitable combinations of resins having different heat shrinkage rates of composite fibers include, for example, polyester-low melting point polyester, polyamide-low melting point polyamide, polyester-polyamide, polyester-polypropylene, polypropylene-low melting point polypropylene, polypropylene-polyethylene and the like. A combination of these synthetic resins can be used. In particular, latently crimped fibers made of a combination of polyester-low-melting polyester or polypropylene-low-melting polypropylene are preferable because of excellent chemical resistance and elongation properties.

  The fineness of the latent crimped fiber is not particularly limited, but the fineness is preferably 3.3 dtex or less so that the bending rigidity is small and the sticking feeling and texture at the time of use are excellent, and it is 2.2 dtex or less. More preferably. The lower limit of the fineness is not particularly limited, but when the base material for a patch is made of a dry nonwoven fabric, it is 0.5 dtex or more so that the texture is excellent and the extensibility is excellent. Preferably, it is 0.8 dtex or more. Two or more types of latent crimped fibers having different fineness may be used. When two or more types of latently crimped fibers are included, it is preferable that the average fineness calculated in the same manner as the hygroscopic fiber is within the fineness range.

  Further, the fiber length of the latent crimped fiber is not particularly limited. However, when the base material for a patch is made of a dry nonwoven fabric, the fiber length is preferably 70 mm or less so that the uniformity of the texture is excellent. More preferably, it is 55 mm or less. On the other hand, it is preferably 25 mm or more, and more preferably 30 mm or more so that sufficient strength can be maintained as a base material for a patch.

  The crimp manifestation fiber of the present invention is one in which the crimp of the latent crimp fiber as described above is expressed, but the expression of the crimp can be performed by heat treatment. The heat treatment can be carried out using, for example, a hot air dryer, an infrared lamp, a heating roll, etc., but under conditions that do not apply strong pressure due to a solid such as a hot air dryer, an infrared lamp, etc. It is preferable to carry out with. Therefore, it is preferable to heat-process with a hot air dryer or an infrared lamp. Further, the heating temperature can be appropriately set after confirming the stress at 50% elongation by experiment.

  The patch base material of the present invention contains the above-described crimp-protruding fibers, and the amount thereof is particularly as long as the stress at 50% elongation in at least one direction of the patch base material is 5 N / 50 mm width or less. Although it does not limit, it is preferable to occupy 65 mass% or more of the whole base material for adhesive patches, and it is more preferable to occupy 70 mass% or more so that it may be excellent in extensibility. On the other hand, it is preferably 85% by mass or less and more preferably 80% by mass or less in view of the balance with the hygroscopic fibers described above.

  The patch base material of the present invention basically comprises hygroscopic fibers and crimped fibers, but may contain fibers other than these fibers as long as the heat generation performance and elongation performance described later are satisfied. For example, polyester fiber (polyethylene terephthalate fiber, polybutylene terephthalate fiber, polytrimethylene terephthalate fiber, etc.), polyolefin fiber (polyethylene fiber, polypropylene fiber, etc.), polyamide fiber (6 nylon fiber, 66 nylon fiber, etc.), polyvinyl Synthetic fibers such as alcohol fibers and acrylic fibers, or cellulosic fibers such as cotton and rayon can be included.

  The form of the base material for a patch of the present invention is not particularly limited as long as the exothermic performance and elongation performance described later are satisfied. For example, it can be in a non-woven form, a woven form, a knitted form, or a composite form thereof. Among these, it is preferable that the nonwoven fabric is excellent in terms of extensibility.

  The base material for a patch of the present invention is excellent in heat generation performance and extensibility, in which the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more, and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. ing. In other words, since the temperature rise rate is 2 ° C. or more 10 minutes after the start of moisture absorption, the temperature of the non-hydrated plaster body can be quickly warmed and the efficacy of the medicinal component can be expected to increase. In addition, since the stress at 50% elongation in at least one direction can be extended with a small force of 5N / 50mm width or less, it is difficult to peel off during use following the movement of the body, and the skin does not stretch and has excellent sticking feeling. Is.

  The higher the temperature rise 10 minutes after the start of moisture absorption, the higher the temperature can be expected. Therefore, the temperature rise is preferably 2.1 ° C. or higher, more preferably 2.3 ° C. or higher. More preferably, it is 4 ° C. or higher. In addition, since the one where the said temperature rise is higher can anticipate the said effect, although the upper limit is not specified in particular, it is about 15 degreeC realistically. The “temperature increase after 10 minutes from the start of moisture absorption” is a value measured by the following procedure: [Adjustment of test piece]-[Adjustment of heat insulation container]-[Measurement of temperature].

[Adjustment of specimen]
(1) The patch base is cut into a 9 cm × 15 cm rectangle, and one test piece is collected.
(2) After winding the 9 cm long side of the test piece into a cylindrical shape, the cylindrical state is loosely fixed with a rubber band.
(3) The test piece in a cylindrical state is heated for 2 hours using a dryer set at a temperature of 105 ° C. to be in an absolutely dry state.
(4) Remove the absolutely dry test piece from the dryer and leave the test piece in a constant temperature and humidity chamber adjusted to a temperature of 20 ° C. and a humidity of 45% RH for 2 hours or more to obtain a constant mass.

[Adjustment of heat insulation container]
(I) Styrofoam (outer dimensions: length 120 mm, width 100 mm, depth 70 mm, inner dimensions: length 95 mm, width 75 mm, depth 45 mm) is prepared as a heat retaining container.
(Ii) Cover the bottom of the heat insulation container with a hydrophilic nonwoven fabric (a hydrophilic nonwoven fabric having a hydrophilic property soaked within 5 seconds when a water drop is dropped), and soak 30 g of purified water in the hydrophilic nonwoven fabric. After covering the container, leave it at room temperature for 2 hours or more.

[Temperature measurement]
(A) Take out a test piece in a cylindrical state from a constant temperature and humidity chamber, and put a thermometer in the hollow part of the test piece [manufactured by Ando Keiki Seisakusho, precision mercury rod thermometer (1-59-3, HG301-50 )] Is inserted.
(B) The test piece in the cylinder state with the thermometer inserted is immediately put into a heat insulating container, the lid is closed, and the temperature (T ₀ ) is measured.
(C) After 10 minutes, the temperature (T ₁₀ ) is measured immediately.
(D) From these measurement results, the temperature rise (= T ₁₀ −T ₀ ) is calculated.

  On the other hand, the smaller the stress at 50% elongation in at least one direction is, the more excellent the above-mentioned effect is, and therefore it is preferably 4.8 N / 50 mm width or less, and 4.6 N / 50 mm width or less. More preferred. On the other hand, if the stress at 50% elongation in any direction is too small, the handleability is poor. Therefore, the stress at 50% elongation in any one direction is preferably 3 N / 50 mm width or more.

  The direction in which the stress at 50% elongation is 5 N / 50 mm width or less may be any direction. However, since the patch base is generally elongated, the length of the patch base is long. In the direction or width direction, even if the patch is cut according to the size of each external patch and the patch substrate is collected, the loss of the patch substrate is small. In addition, when producing a long patch base material, tension is applied in the length direction of the patch base material, and stress tends to increase at 50% elongation. There is a tendency that the stress at the time of 50% elongation is 5 N / 50 mm width or less. However, by controlling the fiber orientation, tension, etc., the 50% elongation stress in the length direction can be made 5 N / 50 mm width or less.

Further, “50% elongation stress” refers to a value obtained as follows.
(1) Three 150 mm × 50 mm rectangular test pieces are collected from the patch base material. For example, in the case of 50% elongation stress in the width direction, three rectangular test pieces having a width direction of 150 mm and a length direction of 50 mm are collected.
(2) The test piece was fixed between the chucks (distance: 100 mm) of a tensile strength tester (Orientec, Tensilon UTM-III-100), and a tensile speed of 200 mm / min. To measure the stress when the distance between chucks is 150 mm.
(3) The above operations (1) and (2) are repeated, the stress is measured for three test pieces, and the arithmetic average value is taken as the stress at 50% elongation.

The basis weight of the base material for a patch of the present invention is particularly limited as long as the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. Although not as formation of the patch medicated substrate is excellent, preferably at 50 g / m ² or more, more preferably 60 g / m ² or more. On the other hand, if the basis weight is too high, the stress at 50% elongation tends to be high, and the sticking feeling at the time of use tends to be poor, so it is preferably 150 g / m ² or less, and 120 g / m ² or less. Is more preferable. The basis weight is a mass per 1 m ² .

The thickness of the patch base material is particularly limited as long as the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. Although it is not a thing, since there exists a tendency for the sticking feeling at the time of use to worsen when it is thick, it is preferable that it is 1.5 mm or less, and it is more preferable that it is 1.2 mm or less. On the other hand, when the thickness is too thin, the non-hydrated plaster body is likely to be reversed, so that the thickness is preferably 0.4 mm or more. The “thickness” is a value measured using a compression elasticity tester under the conditions of a contact area of 5 cm ² and a load of 0.98 N {100 gf}.

  Furthermore, the tensile strength of the base material for a patch is particularly limited as long as the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. However, when peeling off the external patch after use, the tensile strength in the direction of the lowest tensile strength is preferably 20 N / 50 mm width or more so that the patch base material does not break, and 25 N / More preferably, the width is 50 mm or more.

  Further, the elongation rate of the base material for a patch is particularly limited as long as the temperature increase after 10 minutes from the start of moisture absorption is 2 ° C. or more and the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less. Although it is not a thing, it is preferable that the elongation in the direction in which the stress at 50% elongation is 5 N / 50 mm width or less is 80% or more so that the stress at 50% elongation is 5 N / 50 mm width or less, preferably 100% or more. It is more preferable that

In addition, the “tensile strength” and “elongation rate” of the patch base material in the present invention are in accordance with JIS L 1913: 2010 6.3 tensile strength and elongation rate (ISO method) 6.3.1 (standard time). The value measured under the following conditions.
Specimen width: 50 mm
Distance between chucks: 100mm
Tensile speed: 200 mm / min.

  The base material for a patch of the present invention is applied with a plaster containing a medicinal component to become an external patch. In the present invention, heat is generated when the hygroscopic fiber absorbs moisture. However, if the paste contains water, it absorbs water when the paste is applied and becomes saturated, and sufficiently generates heat during use. For this reason, it is preferable to apply a non-hydrated plaster as a plaster. That is, it is preferable to apply plaster for plaster or non-hydrated plaster to obtain a plaster-type external patch or a poultice-type external patch.

  In addition, since the hygroscopic fiber absorbs moisture in the atmosphere and the base material for patch of the present invention generates heat, the patch for external use is used so that it does not come into contact with moisture in the atmosphere until just before using the external patch. Is preferably individually packaged and sealed with a moisture-proof sheet. If the external patch is not individually packaged, it should be sealed like a chuck so that the external patch absorbs moisture in the atmosphere and does not generate heat so that it can be quickly sealed after taking out the necessary amount of external patch. It is preferable to package with a moisture-proof packaging material provided with means. Furthermore, it is preferable to dry and apply the non-hydrated plaster body immediately after sufficiently drying the patch base material before applying the non-hydrated plaster body so that the exothermic property of the base material for patch is excellent. . However, sufficient exothermicity can be exhibited only by controlling the humidity during the manufacturing process so that the hygroscopic fibers do not absorb moisture during the manufacturing process of the patch base material.

  The base material for a patch of the present invention can be produced by a conventional method, for example, by preparing hygroscopic fibers and latent crimped fibers as described above and optionally preparing other fibers. For example, a suitable non-woven fabric form for a patch can be produced as follows.

  Using the prepared hygroscopic fibers, latently crimped fibers, and optionally other fibers, a fiber web containing at least hygroscopic fibers and latently crimped fibers is formed by a dry method such as the card method or airlaid method, or a wet method. Then, after bonding the fibers, after expressing the crimps of the latent crimped fibers, or after expressing the crimps of the latent crimped fibers constituting the similarly formed fiber web, A non-woven fabric base material for a patch can be produced.

  The fiber web may be a single layer fiber web or a two or more layer fiber web. In the case of two or more fiber webs, the fiber blend need not be the same. For example, if the amount of hygroscopic fibers is increased as the fibers constituting the fiber web of the surface layer, the amount of heat generated in the surface layer can be increased. Thus, when there is a bias in the amount of heat generated by the front and back surface layers, such as a bias in the amount of hygroscopic fibers, at least one surface layer has a temperature rise of 2 ° C. or more after 10 minutes from the start of moisture absorption. I just need it.

  In addition, the method for bonding fibers is not particularly limited as long as the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less, but the crimp stretchability of the crimp-exposed fibers is not impaired. It is preferable to use an entanglement method such as needle punching or water entanglement. In particular, water entanglement is preferred because it tends to increase the strength of the patch base material. The hydroentanglement condition is not particularly limited as long as the stress at 50% elongation in at least one direction is 5 N / 50 mm width or less, but if the water pressure is too high, the stress at 50% elongation becomes high and the extensibility is high. Therefore, it is preferable to set the water pressure to 8 MPa even if it is high. In addition, when entangled with a water stream, it is preferable to dry sufficiently so that the exothermic property of a hygroscopic fiber may not be impaired.

  Furthermore, the heat treatment for expressing the crimps of the latent crimped fibers can be performed using, for example, a hot air dryer, an infrared lamp, a heating roll, or the like, but the fibers are bonded to each other so that the feeling of sticking does not deteriorate. Furthermore, it is preferable to carry out under conditions that do not apply strong pressure such as hot air dryer or infrared lamp. In particular, it is preferable that the crimped fibers are heated while overfeeding in consideration of the shrinkage of the fiber web due to the expression of crimps so that the latently crimped fibers exhibit sufficient crimps and excellent extensibility. .

  Examples of the present invention will be described below with specific conditions. However, these conditions are merely examples for facilitating understanding of the description, and the present invention is not limited only to these specific conditions. The design can be changed and modified within the scope of the object of the present invention.

Example 1
Latent crimped fiber (fineness 2.2 dtex, fiber length 51 mm) composed of a combination of polyester / low melting point polyester in a side-by-side type is 70 mass%, acrylate-based hygroscopic fiber (Ax (registered trademark), official moisture content: 20 %, Fineness of 2.2 dtex, fiber length of 47 mm) and 30 mass% were mixed with a card machine to prepare two unidirectional fiber webs.

  Next, the produced unidirectional fiber webs were laminated to form a cross lay web, and then a 95 mesh polyester twill net was used, and 5 m / min. And entangled by a water flow (water pressure: 4 MPa) while being conveyed. Then, after reversing the cross lay web, a water flow (water pressure: 4 MPa) was applied again to the opposite surface to entangle it to form an entangled web.

Next, after the entangled web is sufficiently dried with a hot air dryer set at a temperature of 105 ° C., heat treatment at a temperature of 165 ° C. with a hot air dryer is applied for about 60 seconds in a state where crimps can be freely expressed without applying tension. Thus, a base material for a patch (non-woven fabric) comprising a crimp-exposed fiber having a spiral-like crimp that expresses the crimp of the latent crimped fiber (weight per unit: 100 g / m ² , thickness: 1 mm) Manufactured.

(Example 2)
A base material for patch (weight per unit: 100 g / m ² , thickness: 1 mm) in the form of a non-woven fabric was used in the same manner as in Example 1 except that 80 mass% of the latent crimped fiber and 20 mass% of the hygroscopic fiber were mixed. Manufactured.

(Comparative Example 1)
A base material for patch (weight per unit: 100 g / m ² , thickness: 1 mm) made of a non-woven fabric is used in the same manner as in Example 1 except that 60 mass% of the latent crimped fiber and 40 mass% of the hygroscopic fiber are mixed. Manufactured.

(Comparative Example 2)
A base material for patch (weight per unit: 100 g / m ² , thickness: 1 mm) made of a non-woven fabric is used in the same manner as in Example 1 except that 90 mass% of the latent crimped fibers and 10 mass% of the hygroscopic fiber are mixed. Manufactured.

(Evaluation of the physical properties)
According to the above-mentioned procedure, the stress at 50% elongation, the temperature increase 10 minutes after the start of moisture absorption, the tensile strength, and the elongation rate in the length direction and the width direction of the patch base material were measured.

  In addition, the temperature increase after 10 minutes from the start of moisture absorption after the patch substrate was completely dried was measured by the following procedure: [Adjustment of test piece]-[Adjustment of heat insulation container]-[Measurement of temperature]. .

[Adjustment of specimen]
(1) The patch base was cut into a 9 cm × 15 cm rectangle, and one test piece was collected.
(2) After winding the test piece into a cylindrical shape with the side of 9 cm length as an axis, the cylindrical state was loosely fixed with a rubber band.
(3) The test piece in a cylindrical state was heated for 2 hours using a dryer set at a temperature of 105 ° C. to make it completely dry.
(4) Remove the absolutely dry test piece from the dryer, place the test piece in a polyethylene bag with a chuck (18cm long, 26cm wide), chuck the bag mouth, and leave it in a desiccator for 1 hour. , Allowed to cool.

[Adjustment of heat insulation container]
(I) Styrofoam (outer dimensions: length 120 mm, width 100 mm, depth 70 mm, inner dimensions: length 95 mm, width 75 mm, depth 45 mm) was prepared as a heat retaining container.
(Ii) Three rayon nonwoven fabrics (weight per unit: 140 g / m ² ) are piled on the bottom of the heat insulation container and spread, and 30 g of purified water is soaked in the hydrophilic nonwoven fabric. Left for more than an hour.

[Temperature measurement]
(I) Take out the bag from the desiccator, take out the test piece in a cylindrical state from the bag, and put a thermometer [manufactured by Ando Keiki Seisakusho, precision mercury rod thermometer (1-59-3 HG301-50)].
(B) The test piece in a cylindrical state with the thermometer inserted was immediately put into a heat-retaining container, the lid was closed, and the temperature (T _b ) was measured.
(C) After 10 minutes, the temperature (T _a ) was measured immediately.
(D) The temperature rise (= T _a −T _b ) was calculated from these measurement results.

  These results were as shown in Table 1.

＃：最も引張り強さが低い方向

#: Direction with the lowest tensile strength

  From the results shown in Table 1, in Examples 1 and 2 which are base materials for patches of the present invention, the temperature rise 10 minutes after the start of moisture absorption after conditioning at a temperature of 20 ° C. and a humidity of 45% RH is 2. Since it exhibited excellent heat generation performance of 3 ° C. or higher, it could be expected to enhance the efficacy of medicinal ingredients. It was also found that if the humidity during the manufacturing process is controlled to 45% RH or less, a sufficient heat generation effect can be expected, and management at an excessively low humidity is not necessary.

  Moreover, Examples 1 and 2 which are the base materials for patch of this invention are excellent in the extendibility which can be extended by small force whose stress at the time of 50% expansion | extension in the width direction is 4.7 N / 50mm width or less. Therefore, it was difficult to peel off during use, and the sticking feeling was excellent.

  Furthermore, Examples 1 and 2 which are the base materials for patch of this invention show the further exothermic performance that the temperature rise 10 minutes after a moisture absorption start is 5.5 degreeC or more after absolute drying. Therefore, it could be expected to further increase the efficacy of the medicinal component. Therefore, it was found that it is preferable to sufficiently dry the patch base before applying the non-hydrated plaster body to the patch base.

  Since the base material for a patch of the present invention is excellent in heat generation performance and extensibility, it can be suitably used as a base material for a patch for applying a non-hydrated plaster containing a medicinal component to constitute an external patch.

Claims (1)

It is a base material for patch consisting of a non-woven fabric in which moisture-absorbing fibers with a moisture content of 20% or more and latent-crimped fibers with obvious crimps coexist , and the temperature rise 10 minutes after the start of moisture absorption is 2 ° C or more And the base material for adhesive patches characterized by having a stress at 50% elongation in at least one direction of 5 N / 50 mm width or less.