JP2004255165A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article hardly causing an eruption of the skin at least in the peripheries of gathered parts. <P>SOLUTION: A water soluble skin care agent and an oily skin care agent are applied to the gathered parts applied to the skin of a wearer at the time of wearing the absorbent article 70 and at least a part of the oily skin care agent is allowed to be present on the skin side of the wearer at the time of wearing from the water soluble skin care agent. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an absorbent article containing a skin care agent.

  Since the diaper is worn for a relatively long time and excreted several times during the period, sweat and excrement easily cause the inside humidity to be extremely high. In particular, in a diaper provided with a gather portion for the purpose of suppressing leakage, the gather portion is in contact with the skin because the adhesion to the skin is relatively high in the gather portion and relatively low in other portions in the diaper. It is easy to sweat on the skin, and the skin becomes easily irritated. The same applies to other absorbent articles provided with gathers, such as sanitary napkins, incontinence pads, panty liners, vaginal sheets, and the like.

Therefore, an absorbent article has been proposed in which the occurrence of rash is suppressed by imparting a skin care effect.
For example, Patent Documents 1 and 2 disclose an absorbent product or an absorbent article in which a lotion containing an emollient and a fixing agent capable of immobilizing the emollient is applied to a top sheet or a leg cuff. Patent Documents 3 and 4 disclose absorbent articles in which a drug having a predetermined medicinal effect is fixed or held at a predetermined site. Patent Document 5 describes a porous sheet impregnated with skin lotion and a diaper having a region impregnated with skin lotion.
Japanese Patent No. 3217792 Japanese Patent No. 3217793 JP 2002-113039 A JP-A-2002-200112 International Publication WO 94/9757

By applying a drug such as an emollient and a skin care agent to the absorbent article in advance, it is possible to suppress the occurrence of rash or to cure the rash, but the above drug was applied. Conventional absorbent articles can also rash the skin of the wearer.
Therefore, an object of the present invention is to provide an absorbent article that can suppress skin irritation at least around the gathers.

  Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

  According to one embodiment of the present invention, at least a predetermined portion including a liquid-impermeable outer layer sheet (15) and an absorber (20) fixed on the outer layer sheet and having a stretchable elastic member is provided. An absorbent article (70) formed on (30a, 30b, 35a, 35b, 45a, 45b, 60a, 60b), wherein a water-soluble skin care agent and an oily agent are provided on a surface of the gather portion that comes into contact with the wearer's skin. A skin care agent is applied, and at least a part of the oil-based skin care agent is provided on the skin side of the wearer when worn than the water-soluble skin care agent, to provide an absorbent article characterized by the above-mentioned, To solve the problem.

  By applying at least a part of the oily skin care agent to the wearer's skin side when worn rather than the water-soluble skin care agent, and applying the oily skin care agent and the water-soluble skin care agent to the gather portion, the oil-based skin care It becomes possible to suppress skin irritation by utilizing the medicinal effects of both the preparation and the water-soluble skin care agent.

That is, in the initial stage after wearing the absorbent article, the oily skin care agent is transferred to the wearer's skin to exhibit its medicinal properties, and then the water-soluble skin care agent under the oily skin care agent is applied to the wearer's skin. It is possible to suppress the rash on the skin by transferring and expressing the medicinal effect.
Therefore, by using the above-described absorbent article, it becomes possible to suppress skin irritation at least around the gathers as compared with conventional absorbent articles.

ADVANTAGE OF THE INVENTION According to this invention, the absorptive article which can suppress the rash of the skin at least around a gather part is provided. Therefore, according to the present invention, it becomes easy to provide an absorbent article with further improved safety.
Such actions and advantages of the present invention will be apparent from the following best mode for carrying out the invention.

Hereinafter, embodiments of the absorbent article of the present invention will be specifically described with reference to the drawings.
FIG. 1A is a schematic view of an absorbent article according to an embodiment of the present invention when the absorbent article is held in a tensioned state and viewed from above, and FIG. It is the schematic of the cross section when the absorbent article shown is hold | maintained in a natural state and cut | disconnected at the part corresponding to IB-IB line shown in FIG. 1 (A).

  Here, the “upper surface” referred to in the present specification for the absorbent article means the upper surface of the absorbent article placed with the surface applied to the wearer's body side up when worn. Further, "holding the absorbent article in a tensioned state" means that the absorbent article is stretched in its width direction and in such a manner that deformation caused by contraction of an elastic body provided in the absorbent article substantially disappears. This means that tension is applied and held in the longitudinal direction.

  The illustrated absorbent article 70 is a deployable diaper (hereinafter, referred to as “diaper 70”), and extends along a longitudinal direction indicated by an arrow D1 in FIG. 1A (hereinafter, referred to as “longitudinal direction D1”). Therefore, it can be divided into three regions for convenience. One is a dorsal region R1 mainly applied to the back from the buttocks of the wearer, the other is a crotch region R2 mainly applied to the lower abdomen of the wearer, and the other one is mainly worn. Region R3 applied to the abdomen of the person.

  Leg openings 1a and 1b are formed on both sides of the crotch region 2 in the width direction D2 in order to enhance the fit to the wearer's thighs and improve the wearability. As a result, The width of the crotch region R2 is smaller than the maximum width of the other two regions R1 and R3. The width of the edge on the crotch region R2 side in the back region R1 and the width of the edge on the crotch region R2 side in the abdominal region R3 gradually become smaller as approaching the crotch region R2.

  A pair of tape-shaped members 3 each having a surface fastener male member 3a on one side are fixed to the left and right side edges in the width direction D2 in the back region R1. Further, a female material for a planar fastener (not shown) made of, for example, a nonwoven fabric is fixed to the back surface (outer surface) of the abdominal region R3 in order to fix the tape-shaped member 3 when worn.

  As shown in FIG. 1B, the diaper 70 includes an inner sheet 10 that comes into contact with a wearer's skin when worn, and an outer layer sheet 15 disposed on the back side (outside) of the inner sheet 10 (see FIG. 1B). ) And an absorber 20 for absorbing excrement, and the absorber 20 is disposed between the inner sheet 10 and the outer sheet 15.

  The inner sheet 10 has a liquid-permeable top sheet 11 made of a nonwoven fabric or the like, and liquid-impermeable side sheets 13a and 13b made of a nonwoven fabric or the like. Is covered in plan view. Side sheets 13a or 13b are joined one by one to the left and right edges in the width direction D2 of the topsheet 11.

  The outer layer sheet 15 is a liquid-impermeable sheet formed using an organic polymer material such as polyethylene, polypropylene, and polyester, and prevents leakage of excrement.

  The absorbent body 20 is, for example, an aggregate of hydrophilic fibers such as rayon and cellulose, or an aggregate obtained by subjecting a synthetic fiber such as polyethylene fiber or polypropylene fiber to a hydrophilic treatment, the hydrophilic fiber and the hydrophilic treatment. An aggregate with the applied synthetic fibers, or an absorbent layer made of a material in which a water-absorbing polymer is retained in the aggregate, or the absorbent layer is made of one type of paper, nonwoven fabric, apertured film, etc. Alternatively, it is formed by wrapping with a plurality of types.

  The outline shape and the size of the inner sheet 10 are substantially the same as the outline shape and the size of the outer layer sheet 15, and the inner sheet 10 and the outer layer sheet 15 remove the tape-shaped member 3 from the diaper 70 in plan view. The contour shape and size are substantially determined.

  As shown in FIG. 1 (A), when viewed in the longitudinal direction D1, regions further outside the longitudinal ends of the absorber 20 are waist flaps 30a and 30b arranged around the waist of the wearer when worn. is there. Further, the region outside the width direction side edge of the absorbent body 20 in the region from the waist flaps 30a, 30b to the leg openings 1a, 1b is arranged around the waist flap 35a, 35b when worn. It is. Therefore, the waist flap 30a or 30b and the waist flap 35a or 35b are provided in each of the back region R1 and the abdomen region R3. In FIG. 1A, the waist flap 30a in the dorsal region R1 and the waist flap 30b in the abdominal region R3 are smudged.

  A plurality of elastic members 33a (hereinafter, referred to as "waist elastic members 33a") are arranged on the waist flap 30a so as to extend in the width direction D2. Similarly, a plurality of elastic members 33b (hereinafter, referred to as “waist elastic members 33b”) are arranged on the waist flap 30b so as to extend in the width direction D2.

  As these waist elastic members 33a, 33b, for example, thread rubber, flat rubber, or the like is used, and any of the waist elastic members 33a, 33b is fixed between the inner sheet 10 and the outer sheet 15 under an extended state. ing. For this reason, when the diaper 70 is in a natural state or when the diaper 70 is worn, each of the waist elastic members 33a and 33b relatively contracts, and a waist gather portion is formed on each of the waist flaps 30a and 30b.

  In the present embodiment, a plurality of elastic members 37a or 37b (hereinafter, referred to as "elastic members 37a and 37b") are arranged on the waist flaps 35a and 35b, respectively. Further, on the left side (the left side in FIG. 1A) of the absorbent body 20 when viewed in the width direction D2, a plurality of elastic members 40a (hereinafter, referred to as “extendable”) extend in the longitudinal direction D1. A leg elastic member 40a ") is disposed, and a plurality of elastic elastic members 40b (which extend in the longitudinal direction D1) are provided on the right side of the absorber 20 (the right side in FIG. 1A). Hereinafter, “leg elastic member 40b”) is disposed.

  As the waist elastic members 33a and 33b, thread rubber and flat rubber are used as the waist elastic members 37a and 37b and the leg elastic members 40a and 40b, and any of the elastic members 37a, 37b, 40a, and 40b is It is fixed between the inner sheet 10 and the outer layer sheet 15 under the stretched state. For this reason, when the diaper 70 is in a natural state or when the diaper 70 is worn, the waist elastic members 37a and 37b relatively contract to form a waist gather portion, and the leg elastic members 40a and 40b move relative to each other. As a result, the leg gather portion is formed. The leg gather portion is applied from around the rat's cervix to around the thigh when worn.

  In FIG. 1A, a region where the leg gather portion is formed by the leg elastic member 40a is indicated by reference numeral 45a, and a region where the leg gather portion is formed by the leg elastic member 40b is indicated by reference numeral 45b. Area is smudged. However, the range of each of the illustrated regions 45a and 45b is not strict, but is rough.

  The diaper 70 has three-dimensional guards 60a and 60b, which are gather portions arranged close to the absorber 20, in addition to the gather portions described above. Both of these three-dimensional guards 60a and 60b are provided along the longitudinal direction D1 of the diaper 70.

  The illustrated three-dimensional guards 60a and 60b are formed by bonding the side sheet 13a or 13b (see FIG. 1B) to a part of the top sheet 11 to form a fixed end, and a free end (an end farther from the outer sheet 15). The stretchable elastic member 63a or 63b extending in the longitudinal direction D1 is fixed in an extended state inside the region to be formed so as to stand in the wearer direction. At the time of wearing, the free end stands on the wearer's skin side to form a three-dimensional gather portion.

  The greatest feature of the diaper 70 in the present invention is that a water-soluble skin care agent and an oil-based skin care agent are applied to at least one of the above-mentioned gather portions in a predetermined pattern.

In the present embodiment, the inner surfaces of the waist flaps 30a, 30b, the waist flaps 35a, 35b, the respective regions 45a, 45b, and the three-dimensional guards 60a, 60b (surfaces that are applied to the skin of the wearer when worn) An oily skin care agent is applied, and an oily skin care agent is applied thereon.
Hereinafter, the water-soluble skin care agent and the oil-based skin care agent will be sequentially described in detail.

(A) Water-soluble skin care agent The above water-soluble skin care agent has water solubility or water dispersibility, suppresses the occurrence of rash and inflammation, and when rash and inflammation occur, progress of the rash and inflammation It is preferable to be able to suppress or reduce the rash and inflammation.

  Specific examples of the water-soluble skin care agent include (1) various plant extracts, (2) collagen, (3) natural moisturizing components (NMF), moisturizing agents such as 1,3-butylene glycol, propylene glycol, dipropylene glycol, and glycerin. (4) Arginine, guanidine derivative (for example, organic acid salt of 2- (2-hydroxyethoxy) ethylguanidine (for example, succinate, glycolate, lactate, malate, citrate, tartrate, etc.) )), And (5) anti-inflammatory agents such as guaiazulene, tannin, and gallic acid derivatives.

  In consideration of solubility in water, skin care effect, and cost, it is preferable to use a plant extract or a natural moisturizing component (NMF) as the water-soluble skin care agent.

  Specific examples of the above plant extracts include oat extract, seaweed extract (hibamata) extract, citron extract, hamamelis extract, waremokou extract, asunaro extract, aloe extract, oubaku extract, horsetail extract, chamomile extract, eucalyptus extract, peach leaf extract, etc. Is mentioned. In particular, a high skin care effect can be obtained by using citron extract, hamamelis extract, asunaro extract, aloe extract, oak extract, eucalyptus extract or peach leaf extract.

  When a superabsorbent polymer is used as the material of the absorbent, it is preferable that the water-soluble skin care agent does not cause deterioration such as deterioration of the water absorbing performance of the superabsorbent polymer. It is preferable to use citron extract, hamamelis extract, asunaro extract, aloe extract, oak extract, or peach leaf extract, especially citron extract, hamamelis extract or asunaro extract as a skin care agent.

  The plant extract is, for example, dried or pulverized without drying, or one or more of leaves, bark, roots and branches of various plants, and then extracted with a solvent at room temperature or under heating. Alternatively, it can be extracted using an extraction tool such as a Soxhlet extractor. Use of the 1,3-butylene glycol extract as a plant extract not only increases the solubility in water, but also eliminates the need for explosion proof even if heat treatment is performed in the process of producing the fiber or diaper absorbent article. Further, even when applied to a topsheet or a sheet or fiber that is a material of the topsheet, a decrease in the absorption performance of the absorber constituting the diaper absorbent article is suppressed.

  Usually, the plant extract contains, in addition to the active ingredient, a solvent component and water used for the extraction. In this state, the effective amount of the plant extract (the amount excluding the volatile solvent component and moisture) may be approximately 0.001 to 5% by weight. When 1,3-butylene glycol is used as the solvent component for extraction, the total sum of the active ingredient of the plant extract and 1,3-butylene glycol should be within the above range. The amount of the active ingredient in the plant extract is preferably approximately 0.001 to 10% by weight based on the amount of the solvent component.

  The above-mentioned water-soluble skin care agent can be separated from the predetermined portion of the diaper-absorbent article in the state where it can be released by moisture (in the illustrated diaper 70, each waist flap 30a, 30b, waist flap 35a, 35b, each area 45a, 45b, and each solid). It is preferably fixed to the guards 60a, 60b), and in particular, comes into contact with urine, stool, menstrual blood, vaginal discharge, etc. (hereinafter, these are collectively referred to as "excretion"), or comes in contact with sweat By doing so, it is preferable to be fixed to the absorbent article in a state of being dissolved or dispersed in the excrement or sweat. When the water-soluble skin care agent is present in the absorbent article in such a state, the water-soluble skin care agent easily reaches the wearer's skin during wearing of the absorbent article, so that the skin care effect is exhibited. easy.

Here, in the present specification, the term "fixed in a detachable state by moisture" for a water-soluble skin care agent means that the water-soluble skin care agent has high water solubility or water dispersibility. means. For example, when a sheet on which a water-soluble skin care agent is immobilized is immersed in water (liquid temperature of 25 ° C.) 10 times the weight of the sheet, if the water-soluble skin care agent is completely dissolved or dispersed, It can be said that it is "fixed in a detachable state by moisture".
The water-soluble skin care agent only needs to be able to migrate from the absorbent article to the wearer's skin as the main means of moisture, and may migrate to the wearer's skin by auxiliary means other than moisture.

  For fixing the water-soluble skin care agent to the absorbent article, for example, a coating solution containing the water-soluble skin care agent is applied to a predetermined portion of a surface sheet or an inner sheet or a sheet to be a material of these sheets, and dried. Can be done by

  In the present invention, it is preferable that a surfactant is contained in the above-mentioned coating liquid particularly in the waist gather portion. As a result, the water-soluble skin care agent is stably fixed to the inner sheet surface before sweating or excretion, so that when the oil-based skin care agent transfers to the wearer's skin immediately after wearing, the water-soluble skin care agent is together. Transfer of the agent to the skin side is suppressed. In addition, by using a surfactant in combination, there are also advantages in terms of hydrophilicity, repetitive absorbability of the absorbent in the absorbent article, or rust prevention property for nonwoven fabric and absorbent article production equipment, nonwoven fabric workability, etc. is there.

  When excretion occurs, most of the water-soluble skin care agent moves to the absorber side together with the surfactant, and at this time, a part of the water-soluble skin care agent moves to the wearer's skin side. The water-soluble skin care agent transfers to the skin side of the wearer. Therefore, even if excrement comes into contact with the skin, the water-soluble skin care agent protects the skin, and the occurrence of rash is suppressed or the symptoms are alleviated. In addition, since the transfer of the water-soluble skin care agent to the skin is likely to occur due to sweating and excretion, the moisture in the absorbent article increases due to the absorption of excrement, and even if this condition extends for a long time, the water is not dissolved. It is possible to sufficiently maintain the skin care effect of the sexual skin care agent. As a result, the skin care effect protects the wearer's skin and suppresses the occurrence of rash or alleviates the symptoms.

  When the water-soluble skin care agent is fixed to the absorbent article, when the fixing target of the water-soluble skin care agent is a non-woven fabric, the water-soluble skin care agent is fixed to fibers constituting the non-woven fabric in advance, and the fibers are used as a material. It can also be performed by preparing a nonwoven fabric using To fix the water-soluble skin care agent in this case, for example, a coating solution containing a water-soluble skin care agent and, if necessary, a surfactant or a fiber treatment agent such as a higher alcohol is prepared. It can be carried out by attaching the liquid to the above-mentioned fiber by a method such as dipping, spray coating, roll coating and the like, followed by drying.

  When fixing by any method, the water-soluble skin care agent may be continuously adhered to the surface of the object to be fixed in the form of a film or a layer, or may be discontinuously (for example, in the form of particles or a discontinuous film). ) May be applied.

  The preferable fixed amount of the water-soluble skin care agent varies depending on the type of the water-soluble skin care agent used, and can be appropriately selected within a range that does not adversely affect the skin. If the fixed amount of the water-soluble skin care agent is too large, the skin care effect is saturated. Therefore, it is preferable to determine the upper limit of the fixed amount in consideration of the skin care effect and economy. For example, when a plant extract is used as a water-soluble skin care agent and the water-soluble skin care agent is fixed on the fiber surface, the fixing amount can be 0.01 to 5% by weight, particularly 0.05 to 2% by weight. % Is preferable.

  As shown in FIG. 1 (A), the water-soluble skin care agent is fixed to the area formed by the hydrophobic fibers in a state where the water-soluble skin care agent can be detached by water, such as the inner surfaces of the waist flaps 30a and 30b. It is preferable to use a skin care agent and a surfactant in combination, and it is more preferable to use 1,3-butylene glycol in combination. As described above, 1,3-butylene glycol can be used as a water-soluble skin care agent itself. However, when a plant extract is used as a water-soluble skin care agent, it is used as a solvent for fixing the plant extract on the fiber surface. It is particularly preferred to use.

  As the surfactant contained in the above-mentioned coating solution, any of an anionic surfactant, a cationic surfactant, and a nonionic surfactant can be used. Specific examples of the surfactant include polyoxyethylene alkyl sulfate metal salt, alkyl sulfate metal salt, polyoxyethylene alkyl phosphate metal salt, alkyl phosphate metal salt, fatty acid diethanolamide, fatty acid sorbitan ester (mono , Di, and triesters), alkyl glucosides, polyglycerin fatty acid esters, metal salts of alkyl succinates, and the like. As each of the above metal salts, for example, a sodium salt or a potassium salt can be used.

  The surfactants may be used alone or in combination of two or more. Considering the hydrophilicity and the repetitive absorbency of the absorber in the diaper, or the rust prevention and nonwoven fabric processing properties for nonwoven fabric and diaper manufacturing equipment, as the surfactant, a polyoxyethylene alkyl phosphate metal salt, It is particularly preferable to use one or more of a metal salt of an alkyl phosphate, a fatty acid diethanolamide, a fatty acid sorbitan ester, an alkyl glucoside, and a metal salt of an alkyl succinate.

  Further, from the viewpoint of stably fixing the water-soluble skin care agent to the surface of the hydrophobic fiber, it is preferable to use a mixture of a hydrophilic surfactant and a hydrophobic surfactant. For example, when a mixture of two or more nonionic surfactants is used, HLB (hydrophilic-lipophilic balance) can be used as an index. A hydrophilic surfactant having an HLB of 8 or more, in particular 10 or more, and a hydrophobic surfactant having an HLB of 6 or less, especially 5 or less, are generally obtained as follows: hydrophilic surfactant / hydrophobic surfactant = 90 / When used by mixing at a mixing ratio of 10 to 30/70 (% by weight), the fixation between a sheet made of hydrophobic fibers as a main material and a water-soluble skin care agent is stable, and immediately after wearing the absorbent article. Even if the oil-based skin care agent comes off due to contact with the wearer's skin, the water-soluble skin care agent tends to remain on the sheet. Moreover, at the time of excretion, the water-soluble skin care agent is easily detached from the sheet surface.

  In the above-mentioned coating liquid, in addition to a surfactant and a fiber treating agent, an antistatic agent, an antioxidant, a pH adjuster, a leveling agent, an emulsifier, an antibacterial agent, an antifungal agent, a fragrance, and the like can be blended. .

(B) Oily skin care agent As the oily skin care agent, one having an effect of protecting and healing the wearer's skin can be used without any particular limitation. For example, it is used as an emollient in the field of cosmetics. One or the like can be used.

  Specific examples of the oily skin care agent include liquid paraffin, silicone oil, animal and vegetable oils (such as olive oil, jolly oil, safflower oil, squalane and squalene), monoglyceride, diglyceride, triglyceride, and aliphatic ether (myristyl-1,3-dimethyl). Butyl ether, palmityl-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether, etc.), and isostearyl-cholesterol ester, etc. Is mentioned.

Further, paraffin _wax, C 12 _{-C 22} fatty _acids, C 12 _{-C 44} fatty _ethers, C 12 _{-C 22} fatty alcohols, vaseline, metal soaps (such as magnesium stearate), sucrose fatty acid esters, cyclodextrins fatty esters, silicone A resin, an alkyl silicone, an emollient used in the inventions described in Patent Literature 1 or Patent Literatures 3 to 5, and the like can also be used as the oily skin care agent.

Further, a diamide derivative represented by the following formula (I) described in WO 00/61097 can be used as an oily skin care agent.

  Oil-based skin care agents mainly reduce the friction between the gathers and the wearer's skin, and prevent the excrement from directly contacting the wearer's skin by transferring to the wearer's skin by the tightening force of the gathers. Suppress. This serves to alleviate friction caused by gathers and irritation caused by excretion, thereby suppressing the occurrence of rash. Therefore, the oil-based skin care agent is applied and fixed to a predetermined area of a sheet or an absorbent article to which the water-soluble skin care agent is applied (fixed).

  In the present embodiment, an oily skin care agent whose viscosity at 36 ° C. is 5000 mPa · s or less, particularly 200 to 5000 mPa · s, particularly 500 to 2000 mPa · s is used, or the viscosity of the oily skin care is adjusted to be such. It is preferable to use an agent.

  By using the oily skin care agent having the above viscosity, the oily skin care agent can be effectively transferred to the wearer's skin. When the viscosity of the oil-based skin care agent is 5,000 mPa · s or less, the transferability to the skin becomes extremely good, and it is not necessary to use a large amount of the oil-based skin care agent in order to exhibit a desired rash suppressing effect. Further, the influence on the absorbency is reduced. When the viscosity of the oil-based skin care agent is 200 mPa · s or more, even if the storage period before wearing the absorbent article is long, it is possible to effectively prevent the oil-based skin care agent from migrating to other parts. Therefore, a desired skin care effect can be obtained effectively.

The “viscosity of the oily skin care agent” in the present invention means a viscosity measured as follows.
<Method of measuring viscosity>
The measurement is performed using a tuning fork type viscometer (in this embodiment, a VIBRO NISCOMETER CJV5000 (manufactured by A & D Corporation) is typically used). The oily skin care agent previously heated to about 100 ° C. is gradually cooled to room temperature, and the viscosity at a desired temperature is measured.

  The oily skin care agent used in the present invention preferably has a low temperature dependence of viscosity. Specifically, those having a viscosity at 36 ° C. within the above range and a viscosity at 80 ° C. of 50 to 200 mPa · s are preferred. If the temperature dependence of the viscosity is small, it is easy to apply the oily skin care agent evenly to the sheet, and even if a slight temperature change occurs, it is stably fixed on the sheet. Absorption is less likely to occur due to infiltration or diffusion of water. Further, a two-stage skin care effect in which the oil-based skin care agent first migrates to the wearer's skin, and then the water-soluble skin care agent migrates, easily occurs.

  For the application of the oily skin care agent to the absorbent article or its material, for example, the oily skin care agent is put into a tank of a coating device (applicator), and if necessary, heated to increase its fluidity. It can be performed by coating a predetermined portion of the diaper or its material.

  Examples of the oil-based skin care agent coating method include a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, and a bead method.

  When a method of spraying with air such as a spray method is applied, the oily skin care agent is sprayed on the surface of the application target in the form of fine particles or mist. For this reason, the oily skin care agent is provided continuously on the application target macroscopically, but is discontinuously distributed on the surface of the application target microscopically.

  As a result, it is easy to ensure the liquid permeability of the topsheet while achieving the skin care effect in a wide range, and to effectively utilize the absorption performance of the absorber. The application of an oily skin care agent by a method of blowing with air is suitable for obtaining a desired absorbent article. Of course, even when the method of blowing with air is applied, the shape of the application area of the oily skin care agent can be a desired pattern such as a stripe shape or a lattice shape.

Considering the skin care effect, texture, etc., the applied amount of the oily skin care agent (meaning the applied amount in the area where the oily skin care agent is actually applied) depends on the type and application pattern of the oily skin care agent used. Is preferably in the range of 0.05 to 20 g / m ² , more preferably in the range of 0.1 to 10 g / m ² . These application amounts can be determined from the weight difference between the application target before and after applying the oily skin care agent.

  If necessary, two types of coating methods may be used in one absorbent article. For example, a dice coater method may be employed in the gather portion, and a spray method may be employed in the vicinity of the urination part where both absorption performance and skin care effect are required.

In the diaper 70 of the present embodiment, the water-soluble skin care agent and the oil-based skin care agent described above are applied to the waist flaps 30a and 30b, the waist flaps 35a and 35b, the regions 45a and 45b, and the three-dimensional guards 60a and 60b. In the initial stage of wearing 70, the oil-based skin care agent migrates around the wearer's waist, waist, rat's cervix and its periphery, and around the thigh, and the skin care effect appears. Thereafter, the water-soluble skin care agent fixed under the oil-based skin care agent dissolves or disperses in water derived from sweat or excrement and migrates to the wearer's skin, thereby exhibiting the skin care effect.
Therefore, in the diaper 70, it is possible to suppress skin irritation around the waist, the torso, the rat cervix and its periphery, and around the thigh.

  In the diaper 70 described above, the water-soluble skin care agent and the oil-based skin care agent are applied to all gathers. However, these skin care agents may be applied only to some gathers. An oily skin care agent and a water-soluble skin care agent may be applied to some gathers, and either an oily skin care agent or a water-soluble skin care agent may be applied to some gathers. However, from the viewpoint of preventing skin irritation, it is preferable to apply at least to the waist flap portion (waist gather portion).

  In the waist flaps 30a and 30b, the waist flaps 35a and 35b, the areas 45a and 45b, and the three-dimensional guards 60a and 60b, the water-soluble skin care agent and the oily skin care agent can be locally applied in addition to the entirety. . In both cases of applying the whole and topically, at least a part of the oil-based skin care agent is present on the skin side of the wearer more than the water-soluble skin care agent when the absorbent article is worn. It is preferable to select the application form of the skin care agent.

  When the skin care agent is applied locally on the waist flaps 30a, 30b, the waist flaps 35a, 35b, the areas 45a, the areas 45b, or the three-dimensional guards 60a, 60b, specific examples of the distribution form of the applied area include stripes, Dot shape (island shape), lattice shape, and the like are given.

  Although the absorbent article mentioned as the embodiment is a deployable diaper, the absorbent article of the present invention may be a pants-type diaper, a sanitary napkin, an incontinence pad, a panty liner, a vaginal sheet, etc. Absorbent articles other than diapers may be used as long as they have a portion.

  For example, in a pants-type diaper, since the outer layer sheet has a region in which a waist flap, a waist flap, and a leg gather are formed, a desired one of these regions is provided with the above-described water-soluble skin care agent and an oil-based material. Apply with skin care agent.

  Each sheet used as a material of the absorbent article is often formed of a nonwoven fabric. In applying (fixing) the water-soluble skin care agent or the oil-based skin care agent to the nonwoven fabric, there are no particular restrictions on the fibers constituting the nonwoven fabric, semi-synthetic fibers such as rayon and tencel, polyethylene, polypropylene, polyethylene terephthalate, and polyacryl. Single fibers made of a thermoplastic resin such as an acid or polyamide, or synthetic fibers such as a core-sheath type or side-by-side type composite fiber, as well as natural fibers such as pulp or cotton may be used.

  The fibers constituting the nonwoven fabric may be only one kind or two or more kinds, and each fiber may be in any form of a long fiber or a short fiber. Furthermore, the fineness of the fiber is not particularly limited and can be appropriately selected depending on the intended use or grade of the absorbent article, but the fineness of the fiber used for the inner sheet or the top sheet is as follows. It is often in the range of about 0.5 to 8.9 dtex, especially about 1 to 5.6 dtex.

  The three-dimensional guard can be formed using a sheet of a member different from the top sheet 11 and the side sheet 13 in addition to the formation using the top sheet 11 and the side sheet 13 as in the diaper 70 of the embodiment. .

  In addition to the water-soluble skin care agent, another friction reducing agent may be attached to the absorbent article for the purpose of suppressing skin damage. As other friction reducing agents, plate-like crystals or organic fine particles made of an organic substance can be used. Examples of the plate-like crystals include acylated taurine metal salts (lauroyl taurine calcium salt, lauroyl-β-alanyl calcium), distearyl ether, zinc sodium cetylphosphate, and N-ε-lauroyl-L-lysine. And the like. Examples of the organic particles include silicone beads, nylon beads, chitosan beads, and the like.

  If necessary, an antiperspirant such as aluminum hydroxychloride, aluminum-zirconium salt or zinc paraphenolsulfonate may be applied to the area where the water-soluble skin care agent is applied.

  While the present invention has been described in connection with the most practical and preferred embodiments at this time, the present invention is not limited to the embodiments disclosed herein. It is understood that the invention can be appropriately modified without departing from the gist or idea of the invention, which can be read from the claims and the entire specification, and the absorbent article with such a modification is also understood to be included in the technical scope of the invention. It must be.

Hereinafter, the present invention will be described specifically with reference to examples.
(Example 1)
A deployable diaper having a configuration similar to that of the diaper 70 of the embodiment was prepared except that neither the water-soluble skin care agent nor the oil-based skin care agent was applied to the regions 45a and 45b (see FIG. 1A).

At this time, a nonwoven fabric having a basis weight of 30 g / m ² using a core-sheath type composite fiber having a fineness of 3.3 dtex and having a core component of polypropylene and a sheath component of polyethylene was used as the topsheet 11. Prior to the formation of the nonwoven fabric, the core-sheath type conjugate fiber includes hamamelis extract (1,3 butylene glycol extract) as a water-soluble skin care agent, and polyoxyethylene sorbitan monolaurate as a hydrophilic surfactant. (HLB = 13.3), sorbitan tristearate (HLB = 2.1) which is a hydrophobic surfactant, a monoalkyl phosphate potassium salt, an antistatic agent, a smoothing agent and the like were mixed to form a coating solution. In preparing the coating solution, the amount of sorbitan tristearate was made equal to the amount of polyoxyethylene sorbitan monolaurate. A water-soluble skin care agent is applied to the entire surface sheet 11.

After the formation of the nonwoven fabric, a diamide derivative represented by the following formula (II) was applied to the waist flaps 30a and 30b as an oily skin care agent. This diamide derivative is one kind of the diamide derivative represented by the formula (I).

The application amount (fixed amount) of the above-mentioned Hamamelis extract is 0.07% by weight, and the application amount (application amount in the applied area) of the diamide derivative is 1.0 g / m ² . The viscosity at 36 ° C. of the applied diamide derivative is 1,800 mPa · s. The application of the diamide derivative was performed at a temperature of 80 ° C. using a spray coater.

As the side sheets 13a and 13b, a non-woven fabric having a basis weight of 15 g / m ² formed of polypropylene fibers is used. As the outer layer sheet 15, linear low-density polyethylene and calcium carbonate are uniformly mixed and then extruded from a die. the resulting film permeability obtained by applying a uniaxial stretching process in humidity (JIS Z 0208 compliant) 4800g ^{/ m} 2 · 24 hours of liquid-impermeable breathable film was used. And, as the absorber 20, the one in which the whole absorbent material obtained by mixing the superabsorbent polymer and the pulp at a weight ratio of 50:50 was covered with a mount was used.

(Comparative Example 1)
A diaper was produced in the same manner as in Example 1 except that the oil-based skin care agent was not applied to the waist flaps 30a and 30b.

<Evaluation of diaper rash prevention ability>
The diapers produced in Example 1 and Comparative Example 1 were used by 10 monitors, and the relative frequency of occurrence of rashes in the diaper of Comparative Example 1 was set to 1. The smaller the value, the higher the rash prevention ability compared to the diaper of Comparative Example 1.

Table 1 shows the measurement results of the rash occurrence frequency in each diaper together with the type and application site of the skin care agent applied to the diaper.

  As is clear from Table 1, the diaper produced in Example 1 is more excellent in rash prevention ability than the diaper produced in Comparative Example 1.

まず、前腕内側の所定箇所をアセトン／エーテル（１：１）溶液で清拭し、ここに４．４ｋＰａの圧力下で、油性スキンケア剤を１．０ｇ／ｍ^２の割合で塗布した不織布を押し付けた。この後、同じ箇所に水溶性スキンケア剤と、アンモニア１．５質量％生理食塩水溶液（１００μｌ）を含浸させたパッチテスト用バンソウコウを１．５時間貼付した。バンソウコウを除去した後、３０分静置し、紅斑の発生状態を４段階で（０：紅斑なし、１：ごくわずかに赤い、２：やや赤い、３：赤い）目視判定により確認した。表２に紅斑の発生状態の平均値（紅斑の重篤度のレベル）を示す。

(Example 2)
<Performance test 1 for suppressing the occurrence of erythema>
Using the inner forearm (both hands) of five healthy adults, a patch test was performed with a predetermined combination of a water-soluble skin care agent and an oily skin care agent shown in Table 2, and a test was performed on the ability to suppress the occurrence of erythema. . Sample No. As the oily skin care agent No. 2, a monoamide compound represented by the following formula (III) (having a viscosity at 36 ° C. of 1000 mPa · s) was used.

First, a predetermined portion on the inner side of the forearm is wiped with an acetone / ether (1: 1) solution, and a nonwoven fabric coated with an oily skin care agent at a rate of 1.0 g / m ² is pressed under a pressure of 4.4 kPa. Was. After that, a patch test dresser impregnated with a water-soluble skin care agent and a 1.5% by mass aqueous solution of ammonia in saline (100 μl) was applied to the same portion for 1.5 hours. After the removal of the bansko, the mixture was allowed to stand for 30 minutes, and the occurrence of erythema was visually evaluated in four stages (0: no erythema, 1: very slightly red, 2: slightly red, 3: red). Table 2 shows the average value of the erythema development state (the level of erythema severity).

  As is clear from Table 2, it is more effective to use the oily skin care agent and the water-soluble skin care agent according to the embodiment of the present invention in combination than to use the oily skin care agent or the water-soluble skin care agent alone. Was confirmed to be suppressed.

(Example 3)
<Performance test 2 to suppress erythema>
Using the inside of the upper arm of 13 healthy adults, a test was conducted on the ability of the water-soluble skin care agents shown in Table 3 to suppress the occurrence of erythema. First, a predetermined portion inside the upper arm was wiped with an acetone / ether (1: 1) solution. Thereafter, a 2% by mass aqueous ammonia solution (15 μl) and a 1% solution of various plant extracts shown in Table 3 (1,3-butylene glycol extraction solution) (peach leaf extract is a dry powder, so only peach leaf extract (0.01%) The patch test impregnated with 15 μl was impregnated for 3 hours. After the removal of the bansuko, the erythema was allowed to stand still for 150 minutes, and the state of occurrence of erythema was confirmed by visual judgment in the above four stages. The ratio (B / A) of the visual determination result of erythema (A) in the case of using the lantern impregnated only with ammonia and the visual determination result (B) of the erythema in the case of using the respective water-soluble skin care agents is shown. For each individual, the value obtained by dividing the number of adults in which this value was less than 1 by all 13 was defined as the anti-inflammatory score. Table 3 shows the results. The larger the anti-inflammatory score, the higher the effect of suppressing the occurrence of erythema.

  As is clear from Table 3, it was confirmed that even when any of the water-soluble skin care agents was used, the occurrence of erythema was effectively suppressed as compared with the case where no water-soluble skin care agents were used. It was confirmed to have. Therefore, when these water-soluble skin care agents are used in place of Hamamelis extract in Examples 1 and 2 described above, similar skin care effects are expected to be exerted.

FIG. 1A is a schematic view of a diaper according to one embodiment of the present invention when the diaper is held in a tension state and viewed from above, and FIG. 1B is shown in FIG. 1A. FIG. 2 is a schematic view of a cross section when the diaper is held in a natural state and cut at a location corresponding to the line IB-IB shown in FIG.

Explanation of reference numerals

1a, 1b leg opening 15 outer layer sheet 20 absorber 30a, 30b waist flap 33a, 33b waist elastic member 35a, 35b waist flap 37a, 37b waist elastic member 40a, 40b leg elastic member 45a, 45b leg gather portion is formed Area 60a, 60b Three-dimensional guard 70 Absorbent article (diaper)
R1 dorsal region R2 inseam region R3 ventral region

Claims (5)

A liquid-impermeable outer layer sheet and at least an absorber fixed on the outer layer sheet, a gather portion having a stretchable elastic member is formed at a predetermined portion, and is substantially vertically elongated, and Along the longitudinal direction, the abdomen of the wearer at the time of wearing, crotch, abdominal region arranged on each back, a crotch region and an absorbent article having a back region,
A water-soluble skin care agent and an oily skin care agent are applied to a surface of the gather portion that comes into contact with the wearer's skin,
An absorbent article, wherein at least a part of the oil-based skin care agent is present on the wearer's skin side when worn more than the water-soluble skin care agent. The predetermined portion includes a longitudinal end of the ventral region or the dorsal region, and a gather portion formed at the longitudinal end extends in the width direction of the absorbent article. The absorbent article according to claim 1, wherein the absorbent article is a waist gather portion formed by disposing. On the both sides in the width direction of the crotch region, the crotch region has a leg opening to make the width of the crotch region narrower than the maximum width of the back region and the abdomen region,
The predetermined portion includes a portion adjacent to the leg opening in the width direction, so that the gather portions formed in each of the portions are arranged around the leg of the wearer when worn. The absorbent article according to claim 1, wherein the absorbent article is a leg gather portion formed by disposing an elastic member. The predetermined portion includes a portion that is adjacent to each of the left and right side edges in the width direction of the absorber, and the gather portions formed in each of these portions are arranged with a stretchable elastic member along the longitudinal direction of the absorber. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is a formed three-dimensional guard. The water-soluble skin care agent is a plant extract, and the oil-based skin care agent is represented by the following formula (I)

The absorbent article according to any one of claims 1 to 4, which is a diamide derivative represented by the following formula:

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