JP4318729B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article having high skin protection against excrement and stimulants derived therefrom.

  As an absorbent article for the purpose of preventing the wearer's skin irritation, for example, those described in Patent Document 1 and Patent Document 2 are known. These publications describe disposable diapers in which a lotion containing an emollient is applied to the top sheet. This lotion agent contains an immobilizing agent that immobilizes the emollient on the top sheet.

  In the disposable diaper described in the publication, in order to immobilize the emollient in the top sheet, the emollient is melted together with the immobilizing agent and then applied to the top sheet. Since the immobilizing agent is a hydrocarbon-based compound, it is water-repellent but lipophilic, has a high affinity with the lipophilic substance in the stool, and the lipophilic substance tends to remain on the top sheet. . Moreover, this lipophilic substance becomes easy to contact a wearer's skin, and causes a rash.

  Furthermore, since the immobilizing agent is water-repellent, it is difficult for urine or the like to permeate through the top sheet, and this may impede the absorption performance of the diaper.

Japanese National Patent Publication No. 10-509895 Japanese National Patent Publication No. 10-509896

  Therefore, an object of the present invention is to provide an absorbent article having high skin protection against excrement and irritants derived therefrom without inhibiting the absorption performance of diapers.

  The present invention relates to an absorbent article having a liquid-retaining absorbent layer and a liquid-impermeable back layer, and an absorbent article having a liquid-retainable absorbent layer and a liquid-impermeable back layer. The agent for forming a protective film on the skin, the agent for strengthening the skin, or the agent for reducing the friction between the skin and the absorbent article at a predetermined part of the skin protects the skin against excrement and absorbs the absorbent article. Is achieved by providing an absorbent article that is maintained in such an amount or state that can be fully expressed.

  According to the absorbent article of the present invention, the protection of the skin against excrement and irritants derived therefrom is enhanced while preventing the generation of fluid flow of the excreted liquid.

  Hereinafter, preferred embodiments of the absorbent article of the present invention will be described with reference to the drawings, taking a disposable diaper as an example of the absorbent article.

  As shown in FIG. 1, the disposable diaper 1 of the present embodiment includes a surface material 2 as a liquid-permeable surface layer, and a back material 3 as a liquid-impermeable back layer made of a thermoplastic resin sheet or the like. And an absorbent body 4 as a liquid retaining absorbent layer interposed between the front surface material 2 and the back surface material 3. The absorbent body 4 is curved and formed in an hourglass shape in which the region corresponding to the crotch region of the diaper 1 is constricted, and the front material 2 and the back material 3 also correspond to the crotch region of the diaper 1 in accordance with the shape of the absorbent body 4. The region is curved. The absorber 4 is sandwiched and fixed by the front surface material 2 and the back surface material 3.

  A back side and abdomen side waist portions 5 and 5 ′ and a pair of leg portions 6 and 6 formed by the front surface material 2 and the back surface material 3 extending outward from front and rear and left and right end edges of the absorber 4. When the diaper 1 is worn, the elastic elastic member 7 for fitting the waist portions 5 and 5 ′ and the leg portions 6 and 6 to the wearer's body is fixed by the surface material 2 and the back surface material 3. Is provided. A pair of fasteners 8 each composed of a tape fastener or the like are attached to both ends in the width direction of the back side waist portion 5, and a rectangular landing on the back material 3 in the waist portion 5 ′ on the abdomen side An attachment (not shown) made of tape or the like is attached. And when the disposable diaper 1 of this embodiment is worn, the fastening tool 8 is made to fasten on a to-be-attached tool. As these members constituting the diaper 1, the same members as those used in conventional disposable diapers are used.

  The absorbent body 4 has superabsorbent polymer particles and a nonwoven fabric. The superabsorbent polymer particles are held in the interfiber spacing of the nonwoven fabric. The entire surface of the nonwoven fabric holding the superabsorbent polymer particles is covered with the thin paper 11. Thus, the absorber 4 is configured. The absorbent body 4 having such a configuration is extremely thin as compared with a conventional absorbent body mainly composed of pulp and superabsorbent polymer particles. The fibers constituting the nonwoven fabric include rayon fibers, hydrophilic fibers such as cotton and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, condensed fibers such as polyester and polyamide, and vinyl monomer polymers such as vinyl chloride and vinyl acetate. And the like. Of these fibers, hydrophobic fibers may be used after being hydrophilized by treatment with an oil agent or the like.

  In the diaper 1 of this embodiment, the surface material 2 has a two-layer structure, and is composed of an uppermost layer, that is, a surface layer facing the skin, and a lower layer adjacent to the surface layer. The surface layer and the lower layer are integrated. Both the surface layer and the lower layer are liquid permeable. Furthermore, at least the lower layer is hydrophilic. From the viewpoint of sufficiently increasing the liquid permeability of the surface material 2, the surface layer is also preferably hydrophilic.

Examples of the surface material 2 having a two-layer structure in which at least the lower layer is hydrophilic include those shown in FIGS. 2 (a) to 2 (f) below.
(1) As shown in FIG. 2 (a), on a web 2a made of fibers subjected to a hydrophilic treatment, the fibers are subjected to a hydrophilic treatment or not, and constitute the web. An air-through nonwoven fabric 2c obtained by laminating webs 2b made of fibers that are the same as or different from fibers to form a laminated web, and then subjecting the laminated web to hot air treatment.
(2) As shown in FIG. 2 (b), a spunbond, a span is formed on a hydrophilic base sheet 2d formed in advance, such as paper or a hydrophilic non-woven fabric, with an adhesive 2e such as a hot-melt adhesive. A sheet 2g formed by bonding and integrating a hydrophobic sheet 2f such as bond-meltblown-spunbond (SMS) or spunbond-meltblown-meltblown-spunbond (SMMS).
(3) As shown in FIG. 2 (c), an adhesive 2e such as a hot melt adhesive is applied on the hydrophobic sheet 2f, and hydrophilic fibers such as pulp fibers and rayon fibers are further formed thereon. And a hydrophilic layer 2h made of these fibers to form a sheet 2i. In this sheet, hydrophilic fibers are exposed from the eyes of the hydrophobic sheet 2f, and the liquid is drawn. In actual use, the hydrophobic sheet 2f side is used with the skin side.
(4) As shown in FIG. 2 (d), a sheet 2j obtained by laminating the hydrophobic sheet 2f on the hydrophilic base sheet 2d and embossing them together.
(5) As shown in FIG. 2 (e), a sheet 2k obtained by laminating the hydrophobic sheet 2f on the hydrophilic base sheet 2d and opening them together to integrate them.
(6) As shown in FIG. 2 (f), a hydrophobic substance 2m such as a hot melt adhesive or polyethylene is sprayed on the hydrophilic base sheet 2d in various patterns such as stripes to form the hydrophobic substance. A sheet 2n formed by forming a layer.

  The aforementioned hydrophilization treatment is performed by applying a surfactant such as a nonionic surfactant (polyoxyalkylene alkyl ether or the like).

  In the diaper 1 of the present embodiment, a predetermined medicine is held on the surface material 2. Specifically, the drug is held only on the entire surface layer of the surface material 2. And the said chemical | medical agent is not hold | maintained in the lower layer. By holding the drug in such a state, the protection of the skin against the excrement due to the action of the drug is sufficiently expressed, and the absorption of liquid caused by holding the drug is inhibited. Is prevented, and the absorption performance of the diaper 1 is sufficiently developed. In addition, such a holding state is a state where the drug can be transferred from the surface material 2 to the wearer's skin and attached. The holding state of the drug as in the present embodiment is particularly effective when a water- and oil-repellent drug, which will be described later, is used as the drug. In the present invention, the expression of sufficient absorption performance mainly means that liquid permeation of the surface material is not hindered and liquid flow on the surface material does not occur, as will be apparent from Examples described later. .

  As the drug, (1) a drug that forms a protective film on the skin, (2) a drug that strengthens the skin, or (3) a drug that reduces friction between the skin and the absorbent article is used. By wearing the diaper 1, these drugs move from the diaper 1 to the wearer's skin and exhibit a predetermined effect. These drugs may be used in combinations of two or more. Hereinafter, each of these drugs will be described.

  The said agent which forms a protective film on skin (henceforth a protective film formation agent) transfers to a wearer's skin, forms a protective film on the surface of skin, and protects skin physically. Protective film forming agents include fluorine compounds such as fluorine oils and fluorine polymers, silicone oil, silicone rubber, olefin wax, liquid paraffin, squalane, squalene, petrolatum, fatty acid esters such as isopropyl myristyl, cetanol, stearyl alcohol, etc. Aliphatic alcohol, glycerin fatty acid ester such as 2-ethylhexanoic acid triglyceride, vegetable oil (olive oil and the like) and the like. In particular, it is preferable to use a fluorine-based compound which is a water- and oil-repellent agent from the viewpoint of effectively preventing excrement, particularly feces and lipophilic stimulants derived therefrom from adhering to the skin.

  When a fluorine-based compound is used as the protective film forming agent, the compound may have a perfluoroalkyl group having 4 to 22 carbon atoms, particularly a perfluoroalkyl group having 4 to 12 carbon atoms. From the standpoints of maintaining the blending stability of the agent, preventing the processability from being lowered due to the increase in the viscosity of the protective film forming agent, and suppressing the production cost of the protective film forming agent. In addition, since the protective film forming agent is generally often held in a polyolefin-based material, the fluorine compound may have an alkyl group in addition to the perfluoroalkyl group described above. It is preferable from the viewpoint of improvement in retention. In particular, it is preferable to use an alkyl group having 4 to 22 carbon atoms, particularly 6 to 18 carbon atoms, because the above-described retainability is further improved.

  When a fluorine-based compound is used as the protective film forming agent, either a low molecular weight (for example, molecular weight 100 to 1000) compound or a compound having a molecular weight in the range of oligomer to high molecular weight polymer (for example, molecular weight 10,000 to 1,000,000) It can also be used.

  Examples of low molecular weight fluorine compounds include fluorine oils. Examples of the fluorinated oil agent include a fluorinated ester oil agent and a fluorinated ether oil agent.

  Examples of the fluorine-based compound comprising a polymer include polymers polymerized using monomers having a perfluoroalkyl group such as perfluoroalkyl ester of acrylic acid and perfluoroalkyl ester of methacrylic acid, Examples thereof include a copolymer obtained by copolymerization using two or more kinds of polymers, or a copolymer obtained by copolymerization using these monomers and a monomer having no perfluoroalkyl group.

As the monomer having a perfluoroalkyl group, those represented by the following formula (1) are preferably used. On the other hand, as the monomer having no perfluoroalkyl group, those represented by the following formula (2) are preferably used. In the formulas (1) and (2), R ₁ is preferably H or CH ₃ , particularly preferably CH ₃ . In the formula (1), R ₂ is preferably a C _{2 to} C ₄ alkylene group, and Rf ₁ is preferably a C _{4 to} C ₂₂ , particularly a C _{4 to} C ₁₂ perfluoroalkyl group. In Formula (2), R ₃ is preferably a C _{12 to} C ₂₂ alkyl group. By adjusting the carbon number of R ₃ , the retention of the fluorine-based compound with respect to the polyolefin-based material can be improved.

  Among various fluorine compounds, it is preferable to use a low molecular weight fluorine compound, especially a fluorine oil, particularly from the viewpoint of blending stability, hand-releasability, uniform coatability and the like. In the case of using a fluorine-based compound composed of a high molecular weight polymer, the viscosity at the time of coating is avoided in order to avoid the difficulty of thin film coating due to an increase in viscosity, for example, uneven coating or dripping of coating liquid. Is preferably 10000 mPa · s or less.

  The said chemical | medical agent (henceforth skin strengthening agent) which strengthens skin transfers to a wearer's skin, and strengthens skin with respect to excrement and the irritation | stimulation derived from it. Skin enhancers include natural ceramides, synthetic ceramides, pseudoceramides and other ceramides, plant extracts, astringents, stratum corneum softeners [arginine, guanidine derivatives such as 2- (2-hydroxyethoxy) ethylguanidine organic Acid salts (organic acid salts include succinic acid, glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, etc.)], moisturizers [squalane, squalene, natural moisturizing ingredients (NMF)] and the like. In particular, ceramides, plant extracts, and natural moisturizing components are preferably used from the viewpoint of high barrier reinforcing effect and cost.

  As ceramides, pseudoceramides are preferably used. This is because (1) natural ceramide is difficult to extract and unstable, and (2) synthetic ceramide is expensive. Examples of the pseudo ceramide include water retaining ceramide and barrier ceramide. Examples of the water-retaining ceramide include squingolipid E and aqua ceramide obtained using type 2 ceramide as a lead compound, and examples of the barrier ceramide include those obtained using o-acyl ceramide (type 1 ceramide) as a lead compound.

  On the other hand, plant extracts include oat extract, seaweed extract (Hibamata), cocoon extract, hamamelis extract, bitumen extract, asunaro extract, aloe extract, licorice, duckweed extract, horsetail extract, chamomile extract, eucalyptus extract, peach extract, etc. Can be mentioned. In particular, the use of one or more substances among the plant extracts, hamameris extract, asunalo extract, aloe extract, agaric extract, peach extract, and eucalyptus extract further enhances the skin strengthening effect. Moreover, decomposition of the superabsorbent polymer is also suppressed. Among these, from the viewpoint of further improving the skin strengthening effect and further suppressing the decomposition of the superabsorbent polymer, it is preferable to use a Hamelis extract, asunalo extract or eucalyptus extract. The plant extract is preferably a 1,3-butylene glycol extract from the viewpoint that no explosion-proof treatment is required when heat treatment is performed in the manufacturing process of the absorbent article. Moreover, by using a 1, 3- butylene glycol extract, 1, 3- butylene glycol will coexist in the diaper 1, and deterioration of absorption performance will decrease.

  The agent for reducing friction between the skin and the absorbent article (hereinafter referred to as a friction reducing agent) reduces friction between the skin of the wearer and the absorbent article during wearing of the absorbent article such as a diaper. It is. Examples of the friction reducing agent include plate crystals made of organic substances, acylated taurine metal salts such as lauroyl-β-alanine calcium, lauroyl taurine calcium metal salts, distearyl ether, sodium cetyl phosphate, Nε-lauroyl-L. -Lysine (product name; Amihope LL, Ajinomoto), silicone beads, organic particles (for example, nylon beads, chitosan beads, ultra high molecular weight polyethylene) and the like. In particular, it is preferable to use a plate-like crystal made of an organic material from the viewpoint that excellent tactile sensation and smoothness can be imparted. When the friction reducing agent is a granular material, the particle size is preferably 0.05 to 50 μm, particularly 1 to 20 μm.

  Each of the above drugs is held in at least the main absorption region of the liquid in the surface material 2. The “liquid main absorption region” is a region extending from the crotch part in the front-rear direction and excluding the peripheral part of the surface material 2. Of course, the chemical | medical agent may be hold | maintained over the whole surface material 2. FIG. Moreover, as long as it is a part which can contact the body in the inner surface of a diaper, such as the nonwoven fabric for solid guard formation distribute | arranged as needed, a leg part, and a waist part, you may give to any part. Furthermore, it may be applied in a striped manner as in the embodiments described later.

The agent is in the main absorbent region of the surface material ^{2, 0.001g / m 2 ~20g /} m 2, that are specifically coated in an amount of ^{0.02g / m 2 ~10g / m 2} , the diaper It is preferable from the viewpoint that a sufficient effect is manifested in an economically suitable range without impairing the absorption performance of No. 1 and the feel of touch.

  The said chemical | medical agent is given by means, such as mixing this with water uniformly and apply | coating the obtained aqueous solution or aqueous dispersion to the surface material 2, for example. The concentration of the drug in the aqueous solution or aqueous dispersion is 0.1 to 50% by weight, particularly 3 to 20% by weight. The uniformity of the finish and the ease of processing (increasing the concentration too much, spraying in a mist form) In this case, it is preferable from the viewpoints that fog does not form well, adheres to manufacturing equipment, or drops off.

  In the diaper 1 of the present embodiment, organic or inorganic fine particles such as siccalol, talc, titanium oxide and the like may be contained in the site where the drug is applied for the purpose of smoothing or drying the skin. The particle diameter of the fine particles is preferably 0.05 to 50 μm, and particularly preferably 1 to 20 μm, from the viewpoint that the object is sufficiently achieved.

  The present invention is not limited to the embodiment. For example, in the above embodiment, the drug is held only on the entire surface layer of the surface material having a two-layer structure, but the drug may be held only on the surface of the surface layer and in the vicinity thereof instead. A single-layer surface material can also be used. In that case, the same effect can be exhibited by holding the drug only on the surface of the surface material and in the vicinity thereof.

  Moreover, you may make the absorber 4 contain the pulp generally used for the conventional diaper. In this case, the amount of the superabsorbent polymer is preferably 5 to 300 parts by weight with respect to 100 parts by weight of the pulp.

  Further, the absorbent article of the present invention is not limited to the disposable diaper described above, and can be similarly applied to other absorbent articles such as sanitary napkins, incontinence pads, panty liners, and cage sheets.

  In the following examples, “%” and “parts” mean “% by weight” and “parts by weight”, respectively, unless otherwise specified.

[Example 1]
10 parts of perfluorohexylmethyl-1,3 dimethylbutyl ether (fluorine ether oil) as protective film forming agent, 20 parts of polyoxyethylene lauryl ether (6 moles of added ethylene oxide) and 100 parts of water are mixed and mixed uniformly. Liquid.

A core-sheath composite fiber (3.3 dtex, fiber length 51 mm) having a core of polypropylene and a sheath of polyethylene was immersed in the mixed solution, and the mixed solution was adhered to the composite fiber. The composite fiber is dried to adhere the protective film-forming agent to the composite fiber, and the composite fiber is hydrophilized (70% by weight of sodium polyoxyethylene lauryl ether sulfate and 30% by weight of monolauroyl phosphate potassium salt). The mixture was hydrophilized. The composite fiber thus obtained was applied to a card machine to obtain a first web having a basis weight of 10 g / m ² .

Separately, 20 parts of polyoxyethylene lauryl ether (6 moles of ethylene oxide added) and 100 parts of water were mixed to obtain a uniform aqueous solution. A composite fiber similar to the composite fiber was immersed in the aqueous solution, and the aqueous solution was adhered to the composite fiber. By drying the composite fiber, the composite fiber was hydrophilized with polyoxyethylene lauryl ether. The hydrophilic composite fiber was applied to a card machine to obtain a second web having a basis weight of 15 g / m ² .

Basis weight formed by superimposing the first web on the second web and treating it with hot air at a temperature of 140 ° C. so that the surface layer derived from the first web and the lower layer derived from the second web are integrated. An air-through nonwoven fabric of 25 g / m ² was obtained. In this nonwoven fabric, the protective film forming agent was adhered to the entire surface layer derived from the first web at an adhesion amount of 0.15 g / m ² . The nonwoven fabric thus obtained was used as a surface material for diapers.

100 parts of NBKP and 100 parts of superabsorbent polymer particles (polyacrylic acid crosslinked product) were uniformly mixed. The mixture was wrapped in thin paper with a basis weight of 20 g / m ² , and the total basis weight was 300 g / m ² , which was used as an absorbent body for diapers.

  The said surface material was distribute | arranged to the single side | surface of this absorber, and the polyethylene film was distribute | arranged to the other surface as a back surface material. Furthermore, a known fastener, an elastic elastic member, etc. were arranged to obtain a disposable diaper having the form shown in FIG.

[Example 2]
In place of the protective film forming agent used in Example 1, similarly, a fluorine-based polymer (polymer polymerized using perfluorooctylethyl methacrylate as a monomer, number average molecular weight 18000) as a protective film forming agent. Was used. The fluorine-based polymer is adhered to the fiber by uniformly mixing and emulsifying 3 parts by weight of a fluorine-based polymer, 10 parts by weight of a surfactant and 100 parts by weight of water with a homogenizer, and spraying it on the first web described in Example 1. It was coated and dried (in order to ensure uniform stability of the emulsion, each component was prepared immediately before coating). The viscosity at that time was 10 mPa · s. Except this, it carried out similarly to Example 1, and obtained the disposable diaper.

Example 3
A disposable diaper was obtained in the same manner as in Example 1 except that a mixed solution prepared by adding 1 part of a Hamamelis extract to the mixed solution prepared in Example 1 was used.

Example 4
A disposable diaper was obtained in the same manner as in Example 1 except that a mixed solution prepared by adding 1 part of asunalo extract to the mixed solution prepared in Example 1 was used.

Example 5
The mixed solution used in Example 3 was applied to the surface of the air-through nonwoven fabric prepared in advance and the vicinity thereof in a striped shape (5) with a width of 10 mm and a pitch of 10 mm along the longitudinal direction of the nonwoven fabric. did. The coating method was a gravure coating method, and the adhesion amount after drying was 0.20 g / m ² . Except this, it carried out similarly to Example 1, and obtained the disposable diaper.

[Comparative Example 1]
In the core polypropylene, sheath-core-sheath type composite fibers (3.3 dtex, fiber length 51 mm) made of polyethylene to form a web subjected to carding machine, an air-through nonwoven fabric having a basis weight of 25 g / m ² and processes the web with hot air Got. On one side of this nonwoven fabric, a mixture of 100 parts of polyolefin wax and 20 parts of myristyl isopropylate was applied in stripes (5) with a width of 10 mm and a pitch of 10 mm along the longitudinal direction of the nonwoven fabric. The basis weight of the mixture in the coated part was 5 g / m ² . The nonwoven fabric obtained in this manner was used as a surface material with the surface coated with the mixture as the upper surface. Except this, it carried out similarly to Example 1, and obtained the disposable diaper.

[Comparative Example 2]
A web was produced in which the basis weight of the first web used in Example 1 was changed to 20 g / m ² . Using this web, an air-through nonwoven fabric was obtained under the same conditions as in Example 1. The nonwoven fabric thus obtained was used as a surface material. Except this, it carried out similarly to Example 1, and obtained the disposable diaper. This surface material held a protective film forming agent composed of a fluorine-based compound over the entire thickness direction.

[Performance evaluation]
About the disposable diaper obtained by the Example and the comparative example, the adhesion prevention property of artificial feces, the diaper rash prevention property, and the liquid flow prevention property on a surface material were evaluated with the following method. The results are shown in Table 1.

[Prevention of artificial stool attachment]
1 g of artificial stool (oil pigment 1%, oleic acid 1%, petrolatum 9%, polyethylene glycol 89%) was attached to the forearm of 15 monitors. The diapers obtained in the examples and comparative examples were wound around the forearm portion to which artificial stool was attached so that the surface material opposed to the skin. After 3 hours, the diaper was removed, the part to which the artificial stool was attached was wiped with a commercially available wiping cloth, and the degree of unwiping was evaluated based on the following 3 to 1 criteria.

-Even if you wipe it lightly, there is no wiping residue and you can wipe it clean.・ ・ 3 points.・ ・ ・ ・ ・ ・ ・ ・ 2 points ・ If you wipe gently, you will be worried about unwiping. ... 1 point

  Of the 15 persons, the percentage of monitors that evaluated 3 points was rated as 60% or more, ○ less than 60%, 40% or more, and Δ, less than 40%. It means that adhesion prevention property is so high that the said score is large.

[Diaper rash prevention]
Fifteen monitors were allowed to use diapers for two weeks, and the degree of diaper rash during that period was evaluated according to the following criteria. Further, the degree of dissolution of the superabsorbent polymer after using the diaper was visually evaluated according to the following criteria.

◎ ・ ・ There was no monitor who experienced rash.
○ ・ ・ One or two monitors experienced a rash.
△ ・ 3 or more and less than 5 monitors experienced a rash.
× ·· More than half of monitors experienced rash.

[Liquid flow prevention]
The disposable diaper was fixed on a plate inclined at 45 degrees so that the surface material faced upward. 50 g of physiological saline was flowed to a position 200 mm inside from the upper end of the diaper, and the distance of the physiological saline flowing down on the surface material was measured. The same measurement was repeated 3 times, and the distance of each time was measured. A shorter distance means higher liquid flow prevention. Evaluation was performed according to the following criteria.

◎ ・ ・ The initial liquid flow distance is 60 mm or less, and the liquid flow distance does not become long even if it is repeatedly measured.
○ The liquid flow distance for the first time is more than 60 mm to 100 mm, and the liquid flow distance does not become long even if it is repeatedly measured.
Δ ·· The initial liquid flow distance is 100 mm or less, but the liquid flow distance is gradually increased by repeated measurement. However, the liquid flow distance does not exceed 200 mm, and the liquid does not leak from the end of the diaper.
× ·· In the first or repeated measurement, the liquid flow distance exceeds 200 mm, and the liquid leaks from the end of the diaper.

  As is apparent from the results shown in Table 1, the disposable diaper of the example (product of the present invention) is excellent in anti-fouling property for artificial stool containing an oily substance due to the action of a protective film forming agent comprising a fluorine-based compound. I understand that. In the diaper of Comparative Example 1, since the polyolefin wax held on the surface material is oleophilic, it can be seen that unwiping of the artificial stool is left, resulting in diaper rash.

  Further, in the diaper of Comparative Example 2 in which the protective film forming agent made of a fluorine compound is held over the entire thickness direction of the surface material, liquid flow occurs due to the fluorine compound, and the diaper absorption performance It can be seen that is inhibited. On the other hand, in the diaper of the Example in which the fluorine-based compound is held under a specific state, it can be seen that the liquid flow is prevented and the absorption performance of the diaper is sufficiently expressed.

It is the partially broken top view which looked at the disposable diaper as one Embodiment of the absorbent article of this invention from the surface material side. FIG. 2A to FIG. 2F are schematic views showing a surface material 2 having a two-layer structure in which at least the lower layer is hydrophilic.

Explanation of symbols

1 disposable diaper (absorbent article)
2 Surface material 3 Back material 4 Absorber

Claims (1)

In an absorbent article having a liquid-permeable surface layer, a liquid-retaining absorbent layer, and a liquid-impermeable back layer, a drug that forms a protective film on the skin at a predetermined site of the absorbent article It is maintained in such an amount or state that the protective properties of the skin and the absorbent performance of the absorbent article are sufficiently expressed,
Wherein the agent for forming a protective film on the skin, Ri Tona fluorine-based ether oil or fluorine-based ester oil perfluoroalkyl group Yu vital molecular weight from 100 to 1000 having 4 to 22 carbon atoms,
Surface layer and is composed of a lower layer adjacent to said surface layer, an absorbent article that has been held the drug only in the surface layer in the surface layer of the surface layer is opposed to the skin.

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