Absorbent article

Abstract

To provide an absorbent article whose position is hardly varied according to passing of time, and which can prevent liquid from spreading to a skin contact surface of a liquid permeable sheet, allows liquid to fall to an absorbent core repeatedly, and is excellent in repeated absorbency according to passing of time.SOLUTION: There is provided an absorbent article 1 comprising: a liquid permeable sheet 3 comprising: skin contact surfaces 15, 53, and a non-skin side surface 17; a liquid impermeable sheet 5; and an absorbent core 7a therebetween. In the absorbent article 1, a gel-like composition 13 including: an oily component, a biosurfactant, and a polyalcohol, exists in a material 51 which includes the liquid permeable sheet 3, the material being arranged closer to the liquid permeable sheet 3 side than the absorbent core 7a. In the material 51, an amount of the gel-like composition 13 existing in the skin contact surfaces 15, 53 is less than an amount of the gel-like composition 13 existing in the non-skin contact surface 55.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to absorbent articles.

Background Art

[0002] In order to cause body fluids such as menstrual blood to slide inside the absorbent article, a predetermined blood lubricity imparting agent is applied to the absorbent article. For example, Patent Document 1 discloses an absorbent article having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber between the liquid-permeable topsheet and the liquid-impermeable backsheet, wherein the liquid-permeable topsheet has a concavo-convex structure including convex portions and concave portions on the skin contact surface, and the liquid-permeable topsheet has, in the excretory opening contact area, on at least the convex portions, a kinematic viscosity of 0.01 to 80 mm 2 / s at 40°C, a water retention rate of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000, and contains a blood lubricity imparting agent.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the absorbent article according to Patent Document 1, the blood lubricity imparting agent efficiently causes blood to slide inside the absorbent article, and after absorbing menstrual blood, the topsheet has no sticky feeling and the topsheet is smooth. However, due to its characteristics, the blood lubricity imparting agent is likely to move from the liquid-permeable topsheet, and there is room for improvement. Accordingly, an object of the present disclosure is to provide an absorbent article that is difficult to change its position over time, suppresses the spread of liquid on the skin-contact surface of the liquid-permeable sheet, can repeatedly slide the liquid onto the absorbent core, and has excellent repeated absorbency over time. **Means for Solving the Problems**

[0005] The present inventors provide an absorbent article comprising a liquid-permeable sheet having a skin-contact surface and a non-skin side surface, a liquid-impermeable sheet, and an absorbent core therebetween, wherein a gel composition containing an oily component, a biosurfactant, and a polyhydric alcohol is present in a material containing the liquid-permeable sheet, disposed on the liquid-permeable sheet side of the absorbent core, and in the material, the amount of the gel composition present on the skin-contact surface of the liquid-permeable sheet is less than the amount of the gel composition present on the non-skin contact surface disposed on the liquid-impermeable sheet side of the skin-contact surface of the liquid-permeable sheet. The present inventors have found the absorbent article thus characterized. **Advantages of the Invention**

[0006] The absorbent article of the present disclosure is difficult to change its position over time, suppresses the spread of liquid on the skin-contact surface of the liquid-permeable sheet, can repeatedly slide the liquid onto the absorbent core, and has excellent repeated absorbency over time. **Brief Description of the Drawings**

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0008] Specifically, the present disclosure relates to the following aspects. [Aspect 1] An absorbent article comprising a liquid-permeable sheet having a skin-contact surface and a non-skin side surface, a liquid-impermeable sheet, and an absorbent core therebetween, wherein a gel composition containing an oily component, a biosurfactant, and a polyhydric alcohol is present in a material including the liquid-permeable sheet, which is disposed closer to the liquid-permeable sheet side than the absorbent core, in the material, the amount of the gel composition present on the skin-contact surface of the liquid-permeable sheet is less than the amount of the gel composition present on the non-skin contact surface disposed closer to the liquid-impermeable sheet side than the skin-contact surface of the liquid-permeable sheet, characterized in that the absorbent article is as described above.

[0009] The absorbent article includes a gel composition containing an oily component. Since the gel composition is in a gel state and has a certain viscosity, it is difficult to change its position even when a predetermined pressure (for example, the pressure during storage (transportation) of the absorbent article, etc.) is applied. That is, in the absorbent article, the gel composition is difficult to change its position over time.

[0010] In addition, the oily component in the gel composition is a component for causing a liquid such as body fluid to slide down to the absorbent core. However, since the oily component itself has lipophilicity, if the state of the oily component changes over time, the liquid absorbency may change. For example, when the oily component changes from a state where it is uniformly arranged in fine particles on the liquid-permeable sheet to a state where it is non-uniformly arranged as large droplets on the liquid-permeable sheet, the lipophilic oily component repels the hydrophilic liquid, and the liquid may not slide down to the absorbent core and may easily remain on the liquid-permeable sheet.

[0011] In the above absorbent article, since the oily component exists in a gel form together with the polyhydric alcohol and the biosurfactant, the gel composition has a certain degree of compatibility with liquids even when stored for a long time, particularly at high temperatures.

[0012] Also, in the above absorbent article, in the above material, the amount of the gel composition on the skin contact surface is less than the amount of the gel composition present on the non-skin contact surface, that is, the hydrophilicity of the skin contact surface of the liquid-permeable sheet is higher than the hydrophilicity in other parts (the hydrophilicity inside the absorbent article).

[0013] [First liquid absorption] Therefore, even immediately after production and even when a certain period of time has elapsed since production, when a liquid (first time), such as body fluid, reaches the liquid-permeable sheet during use of the above absorbent article, the liquid easily conforms to the skin contact surface of the liquid-permeable sheet, and while suppressing the liquid from spreading in the planar direction on the skin contact surface of the liquid-permeable sheet, the liquid is easily drawn into the inside of the liquid-permeable sheet. Next, the liquid drawn into the absorbent article from the liquid-permeable sheet can conform to the gel composition containing the hydrophilic component (polyhydric alcohol) and the biosurfactant, and a part of the gel composition containing the lipophilic component (oily component), the hydrophilic component (polyhydric alcohol), and the biosurfactant quickly forms an emulsion of the oily component (first time). A part of the emulsion of the oily component (first time) slides the liquid onto the absorption core, and the remainder reaches the skin contact surface of the liquid-permeable sheet along the path through which the liquid has permeated, and the remaining emulsion of the oily component (first time) is disposed on the skin contact surface of the liquid-permeable sheet.

[0014] [Second liquid absorption] When the liquid (second time) reaches the liquid-permeable sheet, the emulsion (first time) of the remaining oily component present on the skin-contact surface of the liquid-permeable sheet suppresses the liquid from spreading in the planar direction on the skin-contact surface of the liquid-permeable sheet, and can quickly slide the liquid from the skin-contact surface of the liquid-permeable sheet to the absorption core. Further, when the liquid (second time) reaches the liquid-permeable sheet, a part of the gel-like composition further forms an emulsion (second time) of the oily component, and a part of the emulsion (second time) of the oily component slides the liquid to the absorption core, and the remainder reaches the skin-contact surface of the liquid-permeable sheet along the path through which the liquid has permeated, and the emulsion (second time) of the remaining oily component is disposed on the skin-contact surface of the liquid-permeable sheet.

[0015] [Liquid absorption after the third time] In the liquid absorption after the third time, the same mechanism as the second time can be repeated. By repeating these mechanisms, the absorbent article can repeatedly slide the liquid to the absorption core while suppressing the liquid from spreading on the skin-contact surface of the liquid-permeable sheet, whether it is immediately after manufacture or after a certain period of time has elapsed since manufacture, and has excellent repeated absorbency over time.

[0016] [Aspect 2] The absorbent article according to Aspect 1, wherein the amount of the gel-like composition present on the skin-contact surface is 0.

[0017] In the absorbent article, since the amount of the gel-like composition present on the skin-contact surface is 0, when the absorbent article is used, when a liquid (first time) such as body fluid reaches the liquid-permeable sheet, the liquid becomes more familiar with the skin-contact surface of the liquid-permeable sheet, and while further suppressing the liquid from spreading in the planar direction on the skin-contact surface of the liquid-permeable sheet, the liquid is more easily drawn into the liquid-permeable sheet.

[0018] [Aspect 3] The absorbent article according to Aspect 1 or 2, wherein the non-skin-contact surface is the non-skin side surface of the liquid-permeable sheet.

[0019] In the absorbent article, the non-skin contact surface is the non-skin side surface of the liquid-permeable sheet, that is, the gel-like composition is present on the non-skin side surface of the liquid-permeable sheet.

[0020] Therefore, when the liquid (first time) such as body fluid reaches the liquid-permeable sheet in the absorbent article as compared with the case where the gel-like composition is not present on the non-skin side surface of the liquid-permeable sheet, a part of the emulsion of the oily component is more likely to slide down the liquid by the absorption core, and the remainder is more likely to reach the skin contact surface of the liquid-permeable sheet by tracing the path through which the liquid has permeated, and the remaining emulsion of the oily component is more likely to be disposed by the skin contact surface of the liquid-permeable sheet.

[0021] [Aspect 4] The following (i) and (ii), (i) The material further includes a second sheet disposed between the liquid-permeable sheet and the absorption core, and the non-skin contact surface is the skin side surface or the non-skin side surface of the second sheet. (ii) The material further includes a core wrap that covers the absorption core from the liquid-permeable sheet side, and the non-skin contact surface is the skin side surface or the non-skin side surface of the core wrap. The absorbent article according to any one of Aspects 1 to 3, which satisfies at least one of the following.

[0022] Since the absorbent article satisfies at least one of (i) and (ii), even immediately after production or when a certain period of time has elapsed since production, it is possible to repeatedly slide the liquid to the absorption core while suppressing the liquid from spreading to the skin contact surface of the liquid-permeable sheet, and it is excellent in repeated absorbency over time.

[0023] [Aspect 5] The absorbent article according to any one of Aspects 1 to 4, wherein the gel-like composition is configured to form an emulsion of the oily component when coming into contact with moisture.

[0024] In the above absorbent article, since the gel-like composition is configured to form an emulsion of the oily component when it comes into contact with moisture, the effects of Aspect 1 can be more effectively exerted.

[0025] [Aspect 6] The absorbent article according to any one of Aspects 1 to 5, wherein the gel-like composition has a viscosity of 50 to 1,000 Pa·s at a shear rate of 36°C and 0.28 (1 / s).

[0026] In the above absorbent article, since the gel-like composition has a predetermined viscosity at near the wearer's body temperature and at a shear rate corresponding to storage, when the absorbent article is worn, the gel-like composition is difficult to change its position, and when liquid reaches the liquid-permeable sheet, an emulsion of the oily component is likely to be formed.

[0027] [Aspect 7] The absorbent article according to any one of Aspects 1 to 6, wherein the gel-like composition contains the oily component, the polyhydric alcohol, and the biosurfactant in a ratio of 40.0 to 94.9% by mass, 5.0 to 59.9% by mass, and 0.1 to 5.0% by mass based on their total mass.

[0028] In the above absorbent article, since the gel-like composition has a predetermined composition, the effects of Aspect 1 can be more easily exerted.

[0029] [Aspect 8] The absorbent article according to any one of Aspects 1 to 7, wherein the biosurfactant is selected from the group consisting of surfactin, alsurfactin, iturin, and their salts, and any combination thereof.

[0030] In the above absorbent article, since the biosurfactant is selected from predetermined ones, when the gel-like composition comes into contact with liquid, an emulsion of the oily component is likely to be formed, and the effects of Aspect 1 can be more easily exerted.

[0031] [Aspect 9] The absorbent article according to any one of Aspects 1 to 8, wherein the polyhydric alcohol is a trihydric or higher alcohol or a polyether of a dihydric alcohol. In the absorbent article, since the polyhydric alcohol is selected from predetermined ones, when the gel-like composition comes into contact with a liquid, the polyhydric alcohol is more likely to dissolve in the liquid, and the effect of Aspect 1 is more likely to be exhibited.

[0032] [Aspect 10] The absorbent article according to any one of Aspects 1 to 9, wherein the oily component has a kinematic viscosity of 0.01 to 80 mm 2 / s at 40°C, a water retention rate of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000.

[0033] In the absorbent article, since the oily component has a predetermined kinematic viscosity, water retention rate, and weight average molecular weight, the oily component is more likely to cause body fluid to slide from the liquid-permeable sheet to the absorption core, and the effect of Aspect 1 is more likely to be exhibited.

[0034] [Aspect 11] The oily component in the absorbent article according to any one of Aspects 1 to 10 is selected from the group consisting of (a1) an ester of a chain hydrocarbon tetrol and at least one fatty acid, (a2) an ester of a chain hydrocarbon triol and at least one fatty acid, (a3) an ester of a chain hydrocarbon diol and at least one fatty acid, (b1) an ether of a chain hydrocarbon tetrol and at least one aliphatic monohydric alcohol, (b2) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b3) an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c1) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, (c2) an ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c3) an ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol, (d1) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d2) a dialkyl ketone, (d3) an ester of a fatty acid and an aliphatic monohydric alcohol, (d4) a dialkyl carbonate, (e1) a polyoxy C3-C6 alkylene glycol, (e2) an ester of a polyoxy C3-C6 alkylene glycol and at least one fatty acid, (e3) an ether of a polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol, and (f1) a chain alkane, and any combination thereof.

[0035] In the absorbent article, since the oily component is selected from predetermined ones, the oily component makes it easier for body fluid to slide from the liquid-permeable sheet to the absorbent core, and it becomes easier to exhibit the effect of Aspect 1.

[0036] [Aspect 12] The absorbent article according to any one of Aspects 1 to 11, wherein the gel composition further contains a drug.

[0037] In the absorbent article, the gel-like composition further contains a drug. Therefore, when the absorbent article is worn, each time the gel-like composition comes into contact with a liquid, the drug is released from the gel-like composition, and a part of the drug can act on the skin or the like of the wearer of the absorbent article. Thus, the drug can act on the skin of the wearer over a long period of time.

[0038] [Aspect 13] The absorbent article according to any one of Aspects 1 to 12, wherein the oily component further contains a warming agent and / or a cooling agent.

[0039] In the absorbent article, the oily component of the gel-like composition further contains a warming agent and / or a cooling agent. Therefore, when the absorbent article is worn, before the liquid reaches the liquid-permeable sheet, it is difficult for the warming agent and / or the cooling agent to exert their effects, and each time the liquid reaches the liquid-permeable sheet, the oily component is emulsified together with the warming agent and / or the cooling agent and is disposed on the skin-contact surface of the liquid-permeable sheet, so that the warming agent and / or the cooling agent can act on the skin of the wearer over a long period of time.

[0040] [Aspect 14] The absorbent article according to any one of Aspects 1 to 13, which satisfies the relationship that the amount of the gel-like composition present on the skin-contact surface is less than the amount of the gel-like composition present on the non-skin-contact surface in a range overlapping in the thickness direction of the absorbent core and the absorbent article.

[0041] In the absorbent article, since the gel-like composition is present in a predetermined range, an emulsion of the oily component is easily and rapidly formed from the gel-like composition, and the effect of Aspect 1 is more easily exhibited.

[0042] [Aspect 15] The absorbent article according to any one of Aspects 1 to 14, wherein the gel-like composition is disposed in a line shape, a dot shape, or a particle shape on the non-skin-contact surface.

[0043] In the above absorbent article, since the gel-like composition is arranged in a predetermined state on the non-skin contact surface, it is difficult to inhibit the absorbency of the absorbent article, and it becomes easier to exhibit the effects of Mode 1.

[0044] [Mode 16] The absorbent article according to Mode 5, wherein the emulsion has an average particle size of 0.5 to 5.0 μm.

[0045] In the above absorbent article, since the emulsion of the oily component formed from the gel-like composition has a predetermined average particle size, a plurality of emulsions of the oily component are likely to be arranged on the skin contact surface of the liquid-permeable sheet, and the plurality of emulsions are likely to slide the liquid onto the absorption core.

[0046] [Mode 17] The absorbent article according to Mode 16, wherein the liquid-permeable sheet is composed of a non-woven fabric containing fibers having an average fiber diameter of 5 to 60 μm.

[0047] In the above absorbent article, since the liquid-permeable sheet is composed of a predetermined non-woven fabric, the emulsion of the oily component is likely to be arranged on the surface of the fibers of the liquid-permeable sheet, and the emulsion of the oily component arranged on the surface of the fibers is likely to slide the liquid onto the absorption core.

[0048] The absorbent article of the present disclosure will be described in detail below. <Oily component> The above oily component has the same action as the blood lubricity-imparting agent described in Patent Document 1, and has a role of sliding not only menstrual blood but also liquids such as urine from the liquid-permeable sheet to the absorption core.

[0049] The above oily component preferably has a kinematic viscosity of 0.01 to 80 mm 2 / s at 40°C, more preferably 1 to 70 mm 2 / s, still more preferably 3 to 60 mm 2 / s, even more preferably 5 to 50 mm 2 / s, and even more preferably 7 to 45 mm2 It has a kinematic viscosity of / s.

[0050] Also, since the oily component has a kinematic viscosity of 0.01 to 80 mm 2 / s at 40°C, it is preferable that the melting point of the oily component is 45°C or lower. This is because when the oily component contains crystals at 40°C, its kinematic viscosity tends to increase. In this specification, the kinematic viscosity at 40°C may sometimes be simply referred to as "kinematic viscosity". When the above kinematic viscosity exceeds 80 mm 2 / s, the viscosity of the oily component is high, and it tends to be difficult to slide from the liquid-permeable sheet to the absorption core during the first and subsequent liquid absorptions together with the liquid that has reached the skin-contact surface of the liquid-permeable sheet.

[0051] The above kinematic viscosity can be measured at a test temperature of 40°C using a Cannon-Fenske reverse-flow viscometer in accordance with the "5. Kinematic Viscosity Test Method" of JIS K 2283:2000.

[0052] The above oily component preferably has a water retention rate of 0.01 to 4.0% by mass, more preferably 0.02 to 3.5% by mass, still more preferably 0.03 to 3.0% by mass, even more preferably 0.04 to 2.5% by mass, and even more preferably 0.05 to 2.0% by mass.

[0053] In this specification, "water retention rate" means the ratio of water that a substance can hold and can be measured as follows. (1) In a constant-temperature chamber at 40°C, a test tube, a rubber stopper, the substance to be measured, and deionized water are left standing for 24 hours. (2) In the above constant-temperature chamber, 5.0 g of the substance to be measured and 5.0 g of deionized water are put into a 20 mL test tube. (3) In the above constant-temperature chamber, the mouth of the test tube is stoppered with a rubber stopper, rotated once, and left standing for 5 minutes.

[0054] (4) In the above constant-temperature chamber, 3.0 g of the layer of the substance to be measured (usually the upper layer) is collected in a glass petri dish with a diameter of 90 mm (mass: W0). (5) Heat the above petri dish in an oven at 105 °C for 3 hours to evaporate the moisture, and measure the mass for each petri dish (mass: W1). (6) Calculate the water retention rate according to the following formula. Water retention rate (mass %) = 100 × (W0 - W1) / 3.0 The measurement is carried out 3 times, and the average value is adopted.

[0055] The above oil component has a weight average molecular weight of less than 1,000, and preferably has a weight average molecular weight of less than 900. This is because when the weight average molecular weight is 1,000 or more, tackiness occurs in the oil component itself, and there is a tendency to give discomfort to the wearer. The above oil component preferably has a weight average molecular weight of 100 or more, and more preferably has a weight average molecular weight of 200 or more. This is because when the weight average molecular weight becomes small, the vapor pressure of the above oil component becomes high, and problems such as vaporization during storage, reduction in quantity, and odor during wearing may occur.

[0056] In this specification, "weight average molecular weight" is a concept including a polydisperse compound (for example, a compound produced by sequential polymerization, an ester formed from a plurality of fatty acids and a plurality of aliphatic monohydric alcohols), and a single compound (for example, an ester formed from one kind of fatty acid and one kind of aliphatic monohydric alcohol). In a system composed of N i molecules with molecular weight M i (i = 1, or i = 1, 2 ···), the following formula: M w = ΣN i M i 2 / ΣN i M i The M obtained by w means.

[0057] In this specification, the weight average molecular weight means a value in terms of polystyrene determined by gel permeation chromatography (GPC). Examples of the measurement conditions for GPC include the following. Model: High Performance Liquid Chromatogram Lachrom Elite manufactured by Hitachi High-Technologies Corporation Column: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko K.K. Eluent: THF Flow rate: 1.0 mL / min Injection volume: 100 μL Detection: RI (differential refractometer)

[0058] Examples of the above oil components include (a1) esters of chain hydrocarbons with tetraols and at least one fatty acid, (a2) esters of chain hydrocarbons with triols and at least one fatty acid, (a3) esters of chain hydrocarbons with diols and at least one fatty acid, (b1) ethers of chain hydrocarbons with tetraols and at least one aliphatic monohydric alcohol, (b2) ethers of chain hydrocarbons with triols and at least one aliphatic monohydric alcohol, (b3) ethers of chain hydrocarbons with diols and at least one aliphatic monohydric alcohol, (c1) esters of chain hydrocarbons having four carboxyl groups, such as tetracarboxylic acids, hydroxy acids, alkoxy acids, or oxo acids, with at least one aliphatic monohydric alcohol, (c2) esters of chain hydrocarbons having three carboxyl groups, such as tricarboxylic acids, hydroxy acids, alkoxy acids, or oxo acids, with at least one aliphatic monohydric alcohol, (c3) esters of chain hydrocarbons having two carboxyl groups, such as dicarboxylic acids, hydroxy acids, alkoxy acids, or oxo acids, with at least one aliphatic monohydric alcohol, (d1) ethers of aliphatic monohydric alcohols with aliphatic monohydric alcohols, (d2) dialkyl ketones, (d3) esters of fatty acids with aliphatic monohydric alcohols, (d4) dialkyl carbonates, (e1) polyoxy C3-C6 alkylene glycols, (e2) esters of polyoxy C3-C6 alkylene glycols with at least one fatty acid, (e3) ethers of polyoxy C3-C6 alkylene glycols with at least one aliphatic monohydric alcohol, and (f1) chain alkanes.

[0059] [(a1) Ester of a chain hydrocarbon tetrol and at least one fatty acid] (a1) Examples of the ester of a chain hydrocarbon tetrol and at least one fatty acid include tetraester of pentaerythritol and fatty acid, triester of pentaerythritol and fatty acid, diester of pentaerythritol and fatty acid, and monoester of pentaerythritol and fatty acid.

[0060] Examples of the above fatty acids include saturated fatty acids, for example, saturated fatty acids having C2 to C 30 such as acetic acid (C2) (C2 means the number of carbon atoms, the same hereinafter), propanoic acid (C3), butanoic acid (C4) and its isomers, for example, 2-methylpropanoic acid (C4), pentanoic acid (C5) and its isomers, for example, 2-methylbutanoic acid (C5), 2,2-dimethylpropanoic acid (C5), hexanoic acid (C6), heptanoic acid (C7), octanoic acid (C8) and its isomers, for example, 2-ethylhexanoic acid (C8), nonanoic acid (C9), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ), heptadecanoic acid (C 17 ), octadecanoic acid (C 18 ), eicosanoic acid (C 20 ), docosanoic acid (C 22 ), tetracosanoic acid (C 24 ), hexacosanoic acid (C 26 ), octacosanoic acid (C 28 ), triacontanoic acid (C 30 ) etc., as well as isomers of these not listed.

[0061] The above fatty acids can also be unsaturated fatty acids. Examples of the above unsaturated fatty acids include unsaturated fatty acids having C3 to C 20 such as monounsaturated fatty acids, for example, crotonic acid (C4), myristoleic acid (C 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), elaidic acid (C 18) Baxenic acid (C 18 ) Gadreic acid (C 20 ) Eicosenoic acid (C 20 ) etc., di-unsaturated fatty acids, for example, linoleic acid (C 18 ) Eicosadienoic acid (C 20 ) etc., tri-unsaturated fatty acids, for example, linolenic acid, for example, α-linolenic acid (C 18 ) and γ-linolenic acid (C 18 ) Pinolenic acid (C 18 ) Eleostearic acid, for example, α-eleostearic acid (C 18 ) and β-eleostearic acid (C 18 ) Mead acid (C 20 ) Dihomo-γ-linolenic acid (C 20 ) Eicosatrienoic acid (C 20 ) etc., tetra-unsaturated fatty acids, for example, stearidonic acid (C 20 ) Arachidonic acid (C 20 ) Eicosatetraenoic acid (C 20 ) etc., penta-unsaturated fatty acids, for example, bosseopentaenoic acid (C 18 ) Eicosapentaenoic acid (C 20 ) etc., and their partial hydrogenation products are included.

[0062] Considering the possibility of being modified by oxidation etc., as the ester of the above pentaerythritol and fatty acid, it is preferably an ester of pentaerythritol and fatty acid derived from saturated fatty acid, that is, an ester of pentaerythritol and saturated fatty acid. Also, as the ester of the above pentaerythritol and fatty acid, from the viewpoint of reducing the water holding rate value, it is preferably a diester, triester or tetraester, more preferably a triester or tetraester, and even more preferably a tetraester.

[0063] Commercially available products of the above ester of pentaerythritol and fatty acid include Unister H-408BRS, H-2408BRS-22 (mixed product), etc. (all of the above are manufactured by NOF Corporation).

[0064] [Ester of (a2) chain hydrocarbon triol and at least one fatty acid] Examples of the ester of (a2) chain hydrocarbon triol and at least one fatty acid include triesters of glycerin and fatty acids, diesters of glycerin and fatty acids, and monoesters of glycerin and fatty acids.

[0065] The above fatty acids are as described above. From the viewpoint of reducing the water retention rate value, the ester of glycerin and fatty acids is preferably a diester or a triester, and more preferably a triester.

[0066] Examples of the triester of glycerin and two or more fatty acids include, for example, the triester of glycerin and octanoic acid (C8) and decanoic acid (C 10 ), the triester of glycerin and octanoic acid (C8), decanoic acid (C 10 ) and dodecanoic acid (C 12 ), the triester of glycerin and octanoic acid (C8), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ) and octadecanoic acid (C 18 ), etc.

[0067] From the viewpoint of making the melting point 45 ° C or lower, in the triester of glycerin and fatty acids, it is preferable that the total number of carbon atoms of the fatty acids constituting the triester of glycerin and fatty acids is about 40 or less.

[0068] Commercially available products of the triester of glycerin and fatty acids include triolein fatty acid glyceride, NA36, Panasate 800, Panasate 800B and Panasate 810S, and tri C2L oil fatty acid glyceride and tri CL oil fatty acid glyceride (manufactured by NOF Corporation, etc.).

[0069] [(a3) Ester of a chain hydrocarbon diol and at least one fatty acid] (a3) Examples of the ester of a chain hydrocarbon diol and at least one fatty acid include mono-esters or di-esters of a C2-C6 chain hydrocarbon diol, such as a C2-C6 glycol, such as ethylene glycol, propylene glycol, butylene glycol, pentylene glycol or hexylene glycol, and a fatty acid.

[0070] Examples of the above fatty acids include the fatty acids listed in “(a1) Ester of a chain hydrocarbon tetraol and at least one fatty acid”. Considering the possibility of modification by oxidation or the like, the ester of a C2-C6 glycol and a fatty acid is preferably an ester of a C2-C6 glycol and a saturated fatty acid, i.e., an ester derived from a saturated fatty acid.

[0071] Also, from the viewpoint of reducing the water retention rate value, the ester of a C2-C6 glycol and a fatty acid is preferably an ester of a glycol and a fatty acid derived from a glycol having a larger number of carbon atoms, such as an ester of a glycol and a fatty acid derived from butylene glycol, pentylene glycol or hexylene glycol. Furthermore, from the viewpoint of reducing the water retention rate value, the ester of a C2-C6 glycol and a fatty acid is preferably a diester. Examples of commercially available products of the ester of a C2-C6 glycol and a fatty acid include Compol BL, Compol BS (both manufactured by NOF Corporation), etc.

[0072] [(b1) Ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol] (b1) Examples of the ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol include tetra-ethers, tri-ethers, di-ethers and mono-ethers of pentaerythritol and an aliphatic monohydric alcohol.

[0073] Examples of the aliphatic monohydric alcohol include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols. Examples of the above-mentioned saturated aliphatic monohydric alcohols include C1-C 20 saturated aliphatic monohydric alcohols, such as methyl alcohol (C1) (C1 represents the number of carbon atoms, the same hereinafter), ethyl alcohol (C2), propyl alcohol (C3) and its isomers, such as isopropyl alcohol (C3), butyl alcohol (C4) and its isomers, such as sec-butyl alcohol (C4) and tert-butyl alcohol (C4), pentyl alcohol (C5), hexyl alcohol (C6), heptyl alcohol (C7), octyl alcohol (C8) and its isomers, such as 2-ethylhexyl alcohol (C8), nonyl alcohol (C9), decyl alcohol (C 10 ), dodecyl alcohol (C 12 ), tetradecyl alcohol (C 14 ), hexadecyl alcohol (C 16 ), heptadecyl alcohol (C 17 ), octadecyl alcohol (C 18 ), and eicosyl alcohol (C 20 ), and their isomers not listed above.

[0074] Examples of the above-mentioned unsaturated aliphatic monohydric alcohols include those in which one of the C-C single bonds of the above-mentioned saturated aliphatic monohydric alcohols is replaced with a C=C double bond, such as oleyl alcohol, which is commercially available, for example, from Shin Nippon Rika Co., Ltd. under the names of Ricacol series and Angecol series.

[0075] [(b2) Ethers of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol,] Examples of the (b2) ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol include triethers, diethers, and monoethers of glycerin and aliphatic monohydric alcohols. The above-mentioned aliphatic monohydric alcohol is as described above.

[0076] [(b3) Ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol] Examples of the (b3) ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol include diethers of C2-C6 glycols and aliphatic monohydric alcohols, and monoethers of C2-C6 glycols and aliphatic monohydric alcohols. The above-mentioned aliphatic monohydric alcohol is as described above.

[0077] [(c1) Ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol] Examples of the (c1) ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol include, for example, monoester, diester, triester and tetraester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, preferably diester, triester and tetraester, more preferably triester and tetraester, and still more preferably tetraester.

[0078] Examples of the above-mentioned chain hydrocarbon tetracarboxylic acid include alkane tetracarboxylic acids such as butanetetracarboxylic acid, pentanetetracarboxylic acid, hexanetetracarboxylic acid, heptanetetracarboxylic acid, octanetetracarboxylic acid, nonanetetracarboxylic acid and decanetetracarboxylic acid. The above-mentioned aliphatic monohydric alcohol is as described above.

[0079] [(c2) Ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol] (c2) Esters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol include, for example, monoesters, diesters and triesters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters and triesters, and more preferably triesters.

[0080] Examples of the above-mentioned chain hydrocarbon tricarboxylic acid include alkane tricarboxylic acids such as propane tricarboxylic acid, butane tricarboxylic acid, pentane tricarboxylic acid, hexane tricarboxylic acid, heptane tricarboxylic acid, octane tricarboxylic acid, nonane tricarboxylic acid and decane tricarboxylic acid. The above-mentioned aliphatic monohydric alcohol is as described above. As an example, tributyl O-acetylcitrate is mentioned and it is commercially available.

[0081] [(c3) Esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol] (c3) Esters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol include, for example, monoesters and diesters of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol, preferably diesters.

[0082] Examples of the above-mentioned chain hydrocarbon dicarboxylic acid include alkane dicarboxylic acids such as ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid and decanedioic acid. The above-mentioned aliphatic monohydric alcohol is as described above. As an example, dioctyl adipate is mentioned and it is commercially available.

[0083] [(d1) Ether of aliphatic monohydric alcohol and aliphatic monohydric alcohol] As the ether of the aliphatic monohydric alcohol and the aliphatic monohydric alcohol, the following formula (1): R 1 OR 2 (1) (In the formula, R 1 and R 2 each is a chain hydrocarbon) Compounds having it are exemplified. The aliphatic monohydric alcohols constituting the ether (in formula (1), R 1 OH and R 2 corresponding to OH) are as described above.

[0084] [(d2) Dialkyl ketone] As the dialkyl ketone, the following formula (2): R 3 COR 4 (2) (In the formula, R 3 and R 4 each is an alkyl group) Compounds having it are exemplified. The dialkyl ketone can be obtained by oxidizing a secondary alcohol with chromic acid or the like, in addition to being commercially available.

[0085] [(d3) Ester of fatty acid and aliphatic monohydric alcohol] As the ester of the fatty acid and the aliphatic monohydric alcohol, for example, the following formula (3): R 5 COOR 6 (3) (In the formula, R 5 and R 6 are each a chain hydrocarbon) Compounds having it are exemplified.

[0086] The fatty acid constituting the ester (in formula (3), R 5Examples of the group corresponding to COOH include the above-mentioned fatty acids, and considering the possibility of denaturation by oxidation or the like, saturated fatty acids are preferred. The aliphatic monohydric alcohol constituting the above ester (in formula (3), R 6 corresponding to OH) includes, for example, the above-mentioned aliphatic monohydric alcohols.

[0087] Examples of the ester of the above fatty acid and aliphatic monohydric alcohol include, for example, the ester of dodecanoic acid (C 12 ) and dodecyl alcohol (C 12 ), the ester of tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 ), etc. Commercially available products of the ester of the above fatty acid and aliphatic monohydric alcohol include, for example, Electol WE20 and Electol WE40 (both manufactured by NOF Corporation).

[0088] [(d4) Dialkyl carbonate] Examples of the above dialkyl carbonate include the following formula (4): R 7 OC(=O)OR 8 (4) (In the formula, each of R 7 and R 8 is an alkyl group) Compounds having the above are included. In addition to being commercially available, the above dialkyl carbonate can be synthesized by the reaction of phosgene and alcohol, the reaction of chloroformate and alcohol or alcoholate, and the reaction of silver carbonate and alkyl iodide.

[0089] [(e1) Polyoxy C3-C6 alkylene glycol] The above polyoxy C3-C6 alkylene glycol means i) a homopolymer having a C3-C6 alkylene oxide skeleton, i.e., any one skeleton selected from the group consisting of an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton and having hydroxy groups at both ends, ii) a block copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends, or iii) a random copolymer having two or more skeletons selected from the above group and having hydroxy groups at both ends. Examples of commercially available products of the above poly C3-C6 alkylene glycol include, for example, Unionol (trademark) PB-500 and PB-700 (both manufactured by NOF Corporation).

[0090] [(e2) Ester of polyoxy C3-C6 alkylene glycol and at least one fatty acid] Examples of the ester of the above polyoxy C3-C6 alkylene glycol and at least one fatty acid include those in which one or both of the OH terminals of the polyoxy C3-C6 alkylene glycol described in the section of “(e1) polyoxy C3-C6 alkylene glycol” are esterified with a fatty acid, i.e., monoesters and diesters. The above fatty acid is as described above.

[0091] [(e3) Ether of polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol] Examples of the ether of the above polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol include those in which one or both of the OH terminals of the polyoxy C3-C6 alkylene glycol described in the section of “(e1) polyoxy C3-C6 alkylene glycol” are etherified with an aliphatic monohydric alcohol, i.e., monoesters and diesters. The above aliphatic monohydric alcohol is as described above.

[0092] [(f1) Linear alkane] (f1) Examples of the chain alkanes include linear alkanes and branched-chain alkanes. Examples of commercially available products of the above hydrocarbons include Pearl Lime 6 (manufactured by NOF Corporation).

[0093] <Polyhydric alcohol> The above polyhydric alcohol means an alcohol having two or more hydroxyl groups, and examples thereof include dihydric alcohols, trihydric alcohols, tetrahydric alcohols, pentahydric alcohols, hexahydric or higher alcohols, and ethers thereof. It is preferably a trihydric or higher alcohol or a polyether of a dihydric alcohol. Examples of the above dihydric alcohol include C2-C6 chain hydrocarbon diols, such as C2-C6 glycols, such as ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, or hexylene glycol.

[0094] Examples of the above trihydric alcohol include the above-mentioned chain hydrocarbon triols, such as glycerin. Examples of the above tetrahydric alcohol include the above-mentioned chain hydrocarbon tetrols, such as pentaerythritol. Examples of the above pentahydric or higher alcohol include xylitol, sorbitol, etc. Examples of the above ether include diethylene glycol, dipropylene glycol, diglycerin, triethylene glycol, tripropylene glycol, tetraethylene glycol, tetrapropylene glycol, etc.

[0095] <Biosurfactant> The above biosurfactant is a natural compound produced by microorganisms, generally having high biodegradability and low skin irritation to the human body, so it has high stability to the environment and the human body. Examples of the biosurfactant according to the present disclosure include lipopeptide compounds such as surfactin, arthrofactin, iturin, mannosylerythritol lipid, sophorolipid, trehalose lipid, rhamnolipid and other glycolipids, fatty acids such as spiculisporic acid, polymers such as emulzan, and salts thereof, and any combination thereof.

[0096] Due to the high stability of the gel-like composition, lipopeptide compounds and salts thereof are preferred as the above biosurfactant, surfactin, arthrofactin, iturin, and salts thereof are more preferred, and surfactin and salts thereof are even more preferred.

[0097] The salt of surfactin has the following formula (5)

Chemical formula

[0098] The amino acid residue as X can be in the L-form or D-form, preferably in the L-form. The C9-C 18 alkyl group as R means a linear or branched monovalent saturated hydrocarbon group, and examples thereof include n-nonyl group, 6-methyloctyl group, 7-methyloctyl group, n-decyl group, 8-methylnonyl group, n-undecyl group, 9-methyldecyl group, n-dodecyl group, 10-methylundecyl group, n-tridecyl group, 11-methyldodecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group and the like.

[0099] M + Examples of the alkali metal ion as M include lithium ion, sodium ion, potassium ion and the like. M + Examples of the substituent of the quaternary ammonium ion as M include organic groups such as alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group and tert-butyl group; aralkyl groups such as benzyl group, methylbenzyl group and phenylethyl group; and aryl groups such as phenyl group, toluyl group and xylyl group. Examples of the quaternary ammonium ion include tetramethylammonium ion, tetraethylammonium ion, pyridinium ion and the like.

[0100] Surfactin or a salt thereof can be cultured from a microorganism, for example, a strain belonging to Bacillus subtilis, and separated from the culture solution according to a known method, and may be a purified product, or may be used as it is without purification, for example, as the culture solution. Surfactin or a salt thereof may also be synthesized.

[0101] <Gel composition> As long as the above gel composition is in a gel state, its composition is not particularly limited. However, in order to easily exhibit the action of the gel composition, the above oil component, the above polyhydric alcohol, and the above biosurfactant are preferably 40.0 to 94.9% by mass, 5.0 to 59.9% by mass, and 0.1 to 5.0% by mass, more preferably 50.0 to 92.0% by mass, 6.0 to 49.7% by mass, and 0.3 to 4.0% by mass, and still more preferably 60.0 to 90.0% by mass, 7.0 to 39.5% by mass, and 0.5 to 3.0% by mass based on their total mass.

[0102] The above gel composition preferably has a viscosity of 50 to 1,000 Pa·s, more preferably 100 to 800 Pa·s, and even more preferably 200 to 500 Pa·s at 36°C and a shear rate of 0.28 (1 / s). When the gel composition has a predetermined viscosity near the body temperature of the wearer and at the shear rate corresponding to storage, during the wearing of the absorbent article, the gel composition is difficult to change its position, and when liquid reaches the liquid-permeable sheet, an emulsion of the oily component is likely to be formed.

[0103] In this specification, the viscosity of the above gel composition can be measured using the following equipment. · Equipment: Manufactured by Thermo Fisher SCIENTIFIC HAAKE RheoStress1 · Sensor: Cone φ60mm, 1° angle C60 / 1 · Shear rate: 0.28 (1 / s) · Measurement time: 30 seconds · Sampling: 100, average value calculation

[0104] The above gel composition is preferably configured to form an emulsion of the above oily component when it comes into contact with moisture. In that case, the emulsion preferably has an average particle size of 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm. Thereby, the number of emulsions of the oily component disposed on the skin contact surface of the liquid-permeable sheet increases, and each emulsion is likely to slide the liquid onto the liquid absorption core.

[0105] In this specification, the particle size of the emulsion of the oily component formed from the above gel composition can be measured using the following apparatus. · Apparatus: Laser diffraction scattering type particle size distribution measuring apparatus manufactured by MicrotracBEL · Emulsion formation conditions: Add 10.0 g of the gel composition and 90.0 g of water to a 300 mL beaker, stir until the lumps of the gel composition disappear, and let stand for 10 minutes.

[0106] [Other components] The above gel composition can further contain other components as long as its action is not inhibited. Examples of the above other components include components derived from pearls. The above components derived from pearls are not particularly limited as long as they are components derived from mollusks having nacre. Examples of the mollusks having nacre include marine mollusks such as Akoya oyster, Pinctada margaritifera (black pearl oyster), Pinctada maxima (South Sea pearl oyster), Haliotis iris (pearl abalone), etc., and freshwater mollusks such as Hyriopsis cumingii (freshwater pearl mussel), Anodonta woodiana (freshwater pearl mussel), etc.

[0107] Examples of the above components derived from pearls include pulverized products of the above mollusks having nacre, i.e., powders, and organic substances of the above mollusks having nacre, such as protein conchiolin, and peptides and amino acids derived from the above organic substances, such as hydrolyzed conchiolin, etc. The above peptides, amino acids, etc. may be in liquid form.

[0108] Examples of the above other components include, for example, fragrances, solvents, etc. Examples of the above other components include, for example, silicone oil, silicone, silicone-based resins, etc. Examples of the above other components include, for example, antioxidants such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylated hydroxyanisole), propyl gallate, etc.

[0109] Examples of the above other components include, for example, vitamins such as natural vitamins or synthetic vitamins. Examples of the above vitamins include, for example, water-soluble vitamins such as vitamin B group, such as vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B7, vitamin B9, vitamin B 12 etc., and vitamin C. Examples of the above vitamins include, for example, fat-soluble vitamins such as vitamin A group, vitamin D group, vitamin E group, and vitamin K group, etc. The above vitamins also include their derivatives.

[0110] Examples of the above other components include amino acids such as alanine, arginine, lysine, histidine, proline, hydroxyproline, etc., and peptides.

[0111] Examples of the above other components include zeolites such as natural zeolites like analcime, chabazite, stilbite, natrolite, scolecite, and somsonite, as well as synthetic zeolites. Examples of the above other components include cholesterol, hyaluronic acid, lecithin, ceramide, etc.

[0112] Also, examples of the above other components include drugs such as skin astringents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, skin-whitening agents, antibacterial agents, anti-fungal agents, anti-inflammatory agents, warming agents, cooling agents, etc.

[0113] Examples of the above skin astringents include zinc oxide, aluminum sulfate, tannic acid, etc., and oil-soluble skin astringents such as oil-soluble polyphenols. Examples of the above oil-soluble polyphenols include natural oil-soluble polyphenols such as magnolia bark extract, viola extract, bupleurum extract, chamomile extract, burdock extract, sage extract, cinnamon extract, ginkgo extract, birch extract, sweet flag extract, sage extract, germander extract, hibiscus extract, loquat leaf extract, ginkgo extract, hop extract, mulberry extract, and yokukansan extract.

[0114] Examples of the above anti-acne agents include salicylic acid, benzoyl peroxide, resorcinol, sulfur, erythromycin, zinc, etc. Examples of the above anti-wrinkle agents include lactic acid, salicylic acid, salicylic acid derivatives, glycolic acid, phytic acid, lipoic acid, lysophosphatidic acid.

[0115] Examples of the above-mentioned cellulite inhibitor include xanthine compounds such as aminophylline, caffeine, theophylline, theobromine and the like. Examples of the above-mentioned whitening agent include niacinamide, kojic acid, arbutin, glucosamine and its derivatives, phytosterol derivatives, ascorbic acid and its derivatives, and extracts of mulberry and placenta (derived from humans or non-humans). Examples of the above-mentioned anti-inflammatory agent include naturally-derived anti-inflammatory agents such as button, polygonum multiflorum, viola yedoensis, chamomile, licorice, momordica charantia, mugwort, perilla extract, etc., and synthetic anti-inflammatory agents such as allantoin, dipotassium glycyrrhizinate and the like.

[0116] Examples of the above-mentioned heat-sensitive agent include those that activate the TRP channel, such as agonists for the TRPV1 receptor, agonists for the TRPV3 receptor, etc., and it is preferably an agonist for TRPV1. The TRPV1 receptor has a high activation temperature threshold of over 43°C and can impart a high sense of warmth to the wearer.

[0117] From the perspective of the wearer's sense of security, the above-mentioned heat-sensitive agent is preferably a plant-derived compound. Examples of the above-mentioned heat-sensitive agent include capside, capsaicin, capsinoids (dihydrocapsaicin, nordihydrocapsaicin, homodihydrocapsaicin, homocapsaicin, nonivamide, etc.), capsanthin, benzyl nicotinate, β-butoxyethyl nicotinate, N-acyl vanillylamide, vanillylamide of nonanoic acid, polyhydric alcohol, ground red pepper, red pepper tincture, red pepper extract, vanillyl ether of nonanoic acid, vanillyl alcohol alkyl ether derivatives (for example, vanillyl ethyl ether, vanillyl butyl ether, vanillyl pentyl ether, vanillyl hexyl ether), isovanillyl alcohol alkyl ether, ethyl vanillyl alcohol alkyl ether, veratrial alcohol derivatives, substituted benzyl alcohol derivatives, substituted benzyl alcohol alkyl ethers, vanillin propylene glycol acetal, ethyl vanillin propylene glycol acetal, ginger extract, ginger oil, gingerol, zingerone, hesperidin, and pyrrolidone carboxylic acid, and any combination thereof.

[0118] From the perspective that the wearer is less likely to feel pain, itching, etc., the above-mentioned heat-sensitive agent is preferably not capsaicin, and vanillyl alcohol alkyl ether derivatives (for example, vanillyl ethyl ether, vanillyl butyl ether, vanillyl pentyl ether, vanillyl hexyl ether ginger extract, ginger oil, gingerol, and zingerone, and any combination thereof are more preferable.

[0119] Examples of the above-mentioned cooling agent include those that activate the TRP channel, such as agonists for the TRPM8 receptor, agonists for the TRPA1 receptor, etc., and it is preferably an agonist for the TRPM8 receptor.

[0120] Examples of the above-described cooling agent include menthol (e.g., l-menthol) and its derivatives (e.g., menthyl lactate, menthyl glyceryl ether, e.g., l-menthyl glyceryl ether), methyl salicylate, camphor, essential oils derived from plants (e.g., mint, eucalyptus), and the like.

[0121] Examples of the above-described other components include pH adjusters, moisturizers, pigments, dyes, colorants, plant extracts, and the like. Examples of the above-described pH adjusters include those for keeping the skin weakly acidic, such as malic acid, succinic acid, citric acid, tartaric acid, lactic acid, and the like. Examples of the above-described pigment include titanium oxide.

[0122] The above-described other components may be lipophilic or hydrophilic. When the above-described other components are hydrophilic, the hydrophilic other components are likely to exist together with polyhydric alcohols. As a result, when a liquid reaches the liquid-permeable sheet, the hydrophilic other components are likely to dissolve in the liquid together with the polyhydric alcohols, and for example, the actions of the other components can be exerted in the liquid.

[0123] When the above-described other components are lipophilic, the lipophilic other components are likely to exist together with the oily components. As a result, before the liquid reaches the liquid-permeable sheet, it is difficult for the other components, which are lipophilic components, to exert their actions. When the liquid reaches the liquid-permeable sheet, the lipophilic other components are released together with the emulsion of the oily components, and it becomes easier for the other components to exert their actions. For example, when the warming agent and the cooling agent are lipophilic, each time the gel composition comes into contact with the liquid, the warming agent or the cooling agent can impart its action to the wearer.

[0124] [Absorbent article] The absorbent article of the present disclosure includes a liquid-permeable sheet having a skin-contact surface and a non-skin side surface, a liquid-impermeable sheet, and an absorbent core therebetween. The liquid to be absorbed by the absorbent article is not particularly limited as long as it is in a liquid state. Examples thereof include body fluids such as blood, menstrual blood, urine, saliva, sweat, semen, lymph fluid, tissue fluid, body cavity fluid, tears, nasal discharge, breast milk, and the like. Examples of the absorbent article of the present disclosure include those that absorb the above-mentioned liquid, such as sanitary napkins, incontinence sheets, disposable diapers, urine pads, disposable underwear, breast pads, pet sheets, and the like.

[0125] In the above absorbent article, the gel-like composition is present in a material including a liquid-permeable sheet, which is disposed on the liquid-permeable sheet side of the absorbent core. The material includes a liquid-permeable sheet and may further include a second sheet (for example, a diffusion sheet) disposed between the liquid-permeable sheet and the absorbent core, a core wrap, or the like that covers the absorbent core from the liquid-permeable sheet side, as desired.

[0126] In the absorbent article of the present disclosure, the material includes a skin-contact surface provided with the liquid-permeable sheet and a non-skin-contact surface disposed on the liquid-impermeable sheet side of the skin-contact surface of the liquid-permeable sheet. Further, in the material, the amount of the gel-like composition present on the skin-contact surface is less than the amount of the gel-like composition present on the non-skin-contact surface. Thereby, the absorbent article can repeatedly slide the liquid to the absorbent core while suppressing the liquid from spreading to the skin-contact surface of the liquid-permeable sheet, whether immediately after manufacture or after a certain period of time has elapsed since manufacture, and is excellent in repeated absorbency over time.

[0127] In the above material, the relationship that the amount of the gel-like composition present on the skin-contact surface is less than the amount of the gel-like composition present on the non-skin-contact surface is preferably satisfied, for example, in an excretory opening contact region that contacts the excretory opening, a range that overlaps with the absorbent core in the thickness direction of the absorbent article, from the viewpoint of the gel-like composition exerting its function.

[0128] In the present disclosure, the amount of the gel-like composition (the amount of the gel-like composition present on the skin-contact surface and the amount of the gel-like composition present on the non-skin-contact surface) means the average basis weight within a predetermined range. Examples of the above-specified range include a range overlapping with the absorption core in the thickness direction, a range overlapping with the discharge port contact area in the thickness direction, etc., and preferably, it is a range overlapping with the absorption core in the thickness direction. This is from the perspective of the effects of the present disclosure.

[0129] The magnitude of the average basis weight of the gel composition can be evaluated visually. Also, the magnitude of the average basis weight can be evaluated as follows. (1) From the absorbent article, obtain a sheet to be compared (a liquid-permeable sheet, a second sheet if desired, a core wrap if desired, etc.) having a surface to be compared for the average basis weight of the gel composition. Each sheet is separated from the absorbent article using a dryer, a cold spray, etc. as necessary. When the surfaces to be compared are on the same sheet (for example, the skin contact surface and the non-skin side of the liquid-permeable sheet), obtain two sheets of the same sheet from different absorbent articles. (2) Cut the sheet to be compared into the above-specified range. (3) Prepare paraffin paper (multiple sheets are also possible) larger than the above-specified range and measure the mass of the paraffin paper.

[0130] (4) Place the paraffin paper on the surface to be compared of the sheet to be compared. (5) Place the paraffin paper so as to cover the entire surface to be compared of the sheet, place an acrylic plate on it, place a weight on it, and let it stand for 1 minute. The weight is adjusted so that a load of 30 g / cm 2 is applied to the sheet to be compared. (6) Measure the mass of the paraffin paper covering the surface to be compared. (7) Judge that the surface to be compared of the sheet with a larger increase in the mass of the paraffin paper has a larger average basis weight of the gel composition.

[0131] In the above-mentioned material, as the non-skin contact surface, for example, the non-skin side surface of the liquid-permeable sheet can be mentioned. Thereby, when a liquid (first time) such as body fluid reaches the liquid-permeable sheet, compared with the case where the gel-like composition is not present on the non-skin side surface of the liquid-permeable sheet, a part of the oil-based component emulsion (first time) is more likely to slide down the liquid by the absorption core, and the remainder is more likely to reach the skin contact surface of the liquid-permeable sheet by tracing the path through which the liquid has permeated.

[0132] In the above-mentioned material, as the non-skin contact surface, for example, (i) the skin side surface and / or the non-skin side surface of the second sheet having a skin side surface and a non-skin side surface, (ii) the skin side surface and / or the non-skin side surface of the core wrap having a skin side surface and a non-skin side surface, etc. can be mentioned.

[0133] In the above-mentioned material, the non-skin contact surface is preferably close to the wearer, and most preferably the non-skin side surface of the liquid-permeable sheet. Thereby, when a liquid (first time) such as body fluid reaches the liquid-permeable sheet, compared with the case where the gel-like composition is not present on the non-skin side surface of the liquid-permeable sheet, a part of the oil-based component emulsion (first time) is more likely to slide down the liquid by the absorption core, and the remainder is more likely to reach the skin contact surface of the liquid-permeable sheet by tracing the path through which the liquid has permeated.

[0134] In the absorbent article of the present disclosure, when the above-mentioned material has a plurality of non-skin contact surfaces, the gel-like composition may be present on the plurality of non-skin contact surfaces in the above-mentioned material. Thereby, the liquid can be repeatedly slid down to the absorption core, and it is likely to be excellent in repeated absorbency over time.

[0135] When the above-mentioned material has a plurality of non-skin contact surfaces, and when the gel-like composition is present on the plurality of non-skin contact surfaces, among the gel-like compositions present on the plurality of non-skin contact surfaces, if the amount of the gel-like composition on at least one non-skin contact surface is more than the amount of the gel-like composition present on the skin contact surface of the liquid-permeable sheet, the requirement that "the amount of the gel-like composition present on the skin contact surface is less than the amount of the gel-like composition present on the non-skin contact surface" is satisfied.

[0136] However, when the above-mentioned material has a plurality of non-skin contact surfaces, and when the gel-like composition is present on the plurality of non-skin contact surfaces, the amount of the gel-like composition on all the non-skin contact surfaces of the gel-like compositions present on the plurality of non-skin contact surfaces may be more than the amount of the gel-like composition present on the skin contact surface of the liquid-permeable sheet. Thereby, the liquid can be repeatedly slipped onto the absorption core, and it is likely to be excellent in repeated absorbency over time.

[0137] The average basis weight of the gel-like composition present on the skin contact surface is preferably 0 g / m 2 That is, it is preferable that the gel-like composition is not present on the skin contact surface. Thereby, it is likely to suppress the liquid from spreading on the skin contact surface of the liquid-permeable sheet.

[0138] The absorbent article has a gel-like composition on a material including a liquid-permeable sheet disposed on the liquid-permeable sheet side of the absorption core, with a basis weight of preferably 1 to 30 g / m 2 more preferably 2 to 20 g / m 2 and even more preferably 3 to 10 g / m 2 from the viewpoints of the action of the gel-like composition and the absorbency of the absorbent article. Note that the above-mentioned basis weight means the basis weight within the above-mentioned predetermined range.

[0139] In this specification, the above-mentioned basis weight is measured as follows. (1) Cut out the absorbent article within a predetermined range and measure the area of the predetermined range: S (m 2 ). (2) Cut out the materials from the absorbent article from which a predetermined range has been cut out, using a dryer or the like as necessary. (3) Measure the initial mass of the material: m1 (g). (3) Wash the material with sufficient water to remove the gel-like composition from the material. (4) Dry the material from which the gel-like composition has been removed at 40 °C for 24 hours, and measure the mass of the material after drying: m2 (g). (5) Calculate the basis weight using the following formula: Basis weight (g / m 2 ) = (m1 - m2) / S Calculate it according to.

[0140] The gel-like composition can be coated in any form, such as linear, dot-like, particulate (e.g., microparticulate), etc., using a known coater. FIGS. 1 and 2 are diagrams for explaining a sanitary napkin 1 according to one embodiment (the first embodiment) of the present disclosure. Specifically, FIG. 1 is a plan view of the sanitary napkin 1, and FIG. 2 is a partial end view of the II-II end face of FIG. 1. The sanitary napkin 1 according to the first embodiment has a liquid-permeable sheet 3, a liquid-impermeable sheet 5, and an absorber 7 disposed between the liquid-permeable sheet 3 and the liquid-impermeable sheet 5. The absorber 7 includes an absorption core 7a and a core wrap 7b that covers the absorption core 7a. The sanitary napkin 1 also has a side sheet 9 and an embossed portion 11.

[0141] The liquid-permeable sheet 3 includes a skin-contact surface 15 that contacts the wearer's skin and a non-skin side surface 17 that faces the liquid-impermeable sheet 5, and a plurality of linear gel-like compositions 13 are included on the non-skin side surface 17. The plurality of linear gel-like compositions 13 are arranged on the non-skin side surface 17 of the liquid-permeable sheet 3 along the longitudinal direction L of the sanitary napkin 1 and spaced apart in the width direction W of the sanitary napkin 1. In the sanitary napkin 1 according to the first embodiment, the gel-like composition 13 is not disposed on the skin-contact surface 15 of the liquid-permeable sheet 3.

[0142] In the sanitary napkin 1 according to the first embodiment, the material 51 disposed on the side of the liquid-permeable sheet 3 rather than the absorption core 7a includes the liquid-permeable sheet 3 and the core wrap 7b that covers the absorption core 7a from the side of the liquid-permeable sheet 3. The skin contact surface 53 of the material 51 is composed of the skin contact surface 15 of the liquid-permeable sheet 3, and the non-skin contact surface 55 of the material 51 is composed of the non-skin side surface 17 of the liquid-permeable sheet 3 and the skin side surface (not shown) and the non-skin side surface (not shown) of the core wrap 7b.

[0143] FIG. 3 is a plan view showing a sanitary napkin 1 according to another embodiment (second embodiment) of the present disclosure. In the sanitary napkin 1 according to the second embodiment, the liquid-permeable sheet 3 contains the gel-like composition 13 on its non-skin side surface (not shown), and a plurality of dot-like gel-like compositions 13 are arranged in a staggered pattern on the non-skin side surface (not shown) of the liquid-permeable sheet 3. In the sanitary napkin 1 according to the second embodiment, the gel-like composition 13 is not (does not exist) disposed on the skin contact surface 15 of the liquid-permeable sheet 3.

[0144] FIG. 4 is a view for explaining a sanitary napkin 1 according to still another embodiment (third embodiment) of the present disclosure, and is a partial end view corresponding to the II-II end surface of FIG. 1. The sanitary napkin 1 according to the third embodiment includes, in that order, a liquid-permeable sheet 3, a second sheet 21, an absorber 7 (including an absorption core 7a and a core wrap 7b), and a liquid-impermeable sheet 5. The second sheet 21 includes a skin side surface 23 facing the liquid-permeable sheet 3 and a non-skin side surface 25 facing the liquid-impermeable sheet 5, and the skin side surface 23 contains a plurality of linear gel-like compositions 13. The plurality of linear gel-like compositions 13 are arranged on the skin side surface 23 of the second sheet 21 along the longitudinal direction L of the sanitary napkin 1 and spaced apart in the width direction W of the sanitary napkin 1.

[0145] In the sanitary napkin 1 according to the third embodiment, the material 51 disposed on the side of the liquid-permeable sheet 3 rather than the absorption core 7a includes the liquid-permeable sheet 3, the second sheet 21, and a core wrap 7b that covers the absorption core 7a from the side of the liquid-permeable sheet 3. The skin contact surface 53 of the material 51 is constituted by the skin contact surface 15 of the liquid-permeable sheet 3, and the non-skin contact surface 55 of the material 51 is constituted by the non-skin side surface 17 of the liquid-permeable sheet 3, the skin side surface 23 and the non-skin side surface 25 of the second sheet 21, and the skin side surface (not shown) and the non-skin side surface (not shown) of the core wrap 7b.

[0146] FIG. 5 is a view for explaining the sanitary napkin 1 according to still another embodiment (fourth embodiment) of the present disclosure, and is a partial end view corresponding to the II-II end face of FIG. 1. The sanitary napkin 1 according to the fourth embodiment includes a liquid-permeable sheet 3, an absorber 7, and a liquid-impermeable sheet 5 in that order. The absorber 7 includes an absorption core 7a and a core wrap 7b that covers the absorption core 7a from both sides of the liquid-permeable sheet 3 side and the liquid-impermeable sheet 5 side. The core wrap 7b on the liquid-permeable sheet 3 side includes a skin side surface 27 facing the liquid-permeable sheet 3 and a non-skin side surface 29 facing the liquid-impermeable sheet 5, and the skin side surface 27 includes a plurality of linear gel-like compositions 13. The plurality of linear gel-like compositions 13 are arranged on the skin side surface 27 of the core wrap 7b on the liquid-permeable sheet 3 side along the longitudinal direction L of the sanitary napkin 1 and spaced apart in the width direction W of the sanitary napkin 1.

[0147] In the sanitary napkin 1 according to the fourth embodiment, the material 51 disposed on the side of the liquid-permeable sheet 3 rather than the absorption core 7a includes the liquid-permeable sheet 3 and a core wrap 7b that covers the absorption core 7a from the side of the liquid-permeable sheet 3. The skin contact surface 53 of the material 51 is constituted by the skin contact surface 15 of the liquid-permeable sheet 3, and the non-skin contact surface 55 of the material 51 is constituted by the non-skin side surface 17 of the liquid-permeable sheet 3 and the skin side surface 27 and the non-skin side surface 29 of the core wrap 7b.

[0148] The liquid-permeable sheet can be a fabric (for example, a non-woven fabric, a woven fabric, and a knitted fabric), a perforated film, or the like. When the liquid-permeable sheet is a fabric, the fibers constituting the fabric preferably have an average fiber diameter of 5 to 60 μm, more preferably 10 to 40 μm, and even more preferably 15 to 30 μm. Thereby, the emulsion of the oily component is easily disposed on the surface of the fibers constituting the fabric, and the emulsion of the oily component easily slides the liquid to the liquid absorption core. Note that the effect is higher when the average particle diameter of the emulsion of the oily component is in the above range.

[0149] Further, the average fiber diameter of the fibers constituting the fabric is preferably larger than the emulsion of the oily component, more preferably 2 times or more larger, even more preferably 3 times or more larger, still more preferably 5 times or more larger, and still more preferably 7 times or more larger. Thereby, the emulsion of the oily component is easily disposed on the surface of the fibers.

[0150] In this specification, the average fiber diameter of the fibers is measured as follows. · Cut out 10 samples of 5 mm × 5 mm in length and width from an arbitrary location of the liquid-permeable sheet. · Using a scanning electron microscope (manufactured by KEYENCE, VE-7800), take a total of 10 photographs (1 photograph per sample) of the surface of the sample at a magnification of 500 times. · In each of the total 10 photographs, measure the fiber diameters of a predetermined number (for example, 10) of fibers. · The value obtained by dividing the sum of the fiber diameters of the predetermined number in the total 10 photographs by the sum of the predetermined number in the total 10 photographs is defined as the average fiber diameter.

Example

[0151] Hereinafter, the present disclosure will be described with examples, but the present disclosure is not limited to these examples. [Production Example 1] 80.0 parts by mass of Panacet 810S (manufactured by NOF Corporation) as an oily component, 19.0 parts by mass of glycerin, and 1.0 part by mass of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form Gel Composition No. 1. Note that Panacet 810S is C8 fatty acid: C 10It is a triester (triglyceride) of glycerin and fatty acids, containing the fatty acids in a weight ratio of approximately 85:15.

[0152] Gel composition No. 1 was applied to a spunbond nonwoven fabric (basis weight: 20 g / m 2 ) in a range of 400 m × 80 mm so that the basis weight became 20 g / m 2 . The liquid-permeable sheet of a commercially available urine collection pad (manufactured by Unicharm Corporation, Lifree Long-hour Peace-of-mind Urine Collection Pad, Daytime Super, hereinafter referred to as "commercially available urine collection pad") was peeled off, and the nonwoven fabric coated with Gel composition No. 1 was used as the liquid-permeable sheet. It was attached to the commercially available urine collection pad so that Gel composition No. 1 was on the non-skin side and so that Gel composition No. 1 was present starting from a position 30 mm from the end of the absorption core on the back side, obtaining Urine collection pad No. 1.

[0153] [Reference Production Example 1] Urine collection pad No. 2 was obtained in the same manner as in Production Example 1, except that the liquid-permeable sheet of the commercially available urine collection pad was peeled off, and the nonwoven fabric coated with Gel composition No. 1 was attached to the commercially available urine collection pad so that Gel composition No. 1 was the skin contact surface.

[0154] [Comparative Production Example 1] Urine collection pad No. 3 was obtained in the same manner as in Production Example 1, except that the liquid-permeable sheet of the commercially available urine collection pad was peeled off, and a spunbond nonwoven fabric (basis weight: 20 g / m 2 ) not coated with Gel composition No. 1 was attached to the commercially available urine collection pad as the liquid-permeable sheet.

[0155] [Example 1, Reference Example 1, and Comparative Example 1] [Liquid flow length, diffusion length on the liquid-permeable sheet side, and diffusion length on the liquid-impermeable sheet side] Each of the urine collection pads No. 1 to No. 3 (hereinafter referred to as "each urine collection pad") was fixed to a platform inclined at 30 degrees with the dorsal side facing upward. At a position 50 mm from the end of the absorption core on the dorsal side of each urine collection pad, 100 mL of artificial urine (prepared by dissolving 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate, 3 g of calcium chloride, and approximately 1 g of Food Blue No. 1 in 10 L of ion-exchanged water) was dropped from a dropping funnel at a rate of 10 mL / second three times at 10-minute intervals. The liquid flow length, the diffusion length on the liquid-permeable sheet side, and the diffusion length on the liquid-impermeable sheet side of each urine collection pad were measured. The results are shown in Table 1.

[0156] Note that the liquid flow length means the length of the artificial urine flowing on the skin contact surface of the liquid-permeable sheet during the dropping of the artificial urine (the length in the longitudinal direction of the urine collection pad from the dropping point of the artificial urine to the farthest reaching point of the artificial urine flowing on the skin contact surface of the liquid-permeable sheet). The diffusion length on the liquid-permeable sheet side means the diffusion length of the artificial urine observed from the liquid-permeable sheet side 3 minutes after the dropping (the length in the longitudinal direction of the urine collection pad from the dropping point of the artificial urine to the farthest reaching point of the artificial urine). The diffusion length on the liquid-impermeable sheet side means the diffusion length of the artificial urine observed from the liquid-impermeable sheet side immediately after the measurement of the diffusion length on the liquid-permeable sheet side (the length in the longitudinal direction of the urine collection pad from the dropping point of the artificial urine to the farthest reaching point of the artificial urine).

[0157] [Rewet] Using samples different from the urine collection pads for which the above liquid flow length, the diffusion length on the liquid-permeable sheet side, and the diffusion length on the liquid-impermeable sheet side were measured, 60 pieces of filter paper (100 mm × 100 mm) for measuring the initial mass: m3 (g) were placed around the location where the artificial urine was dropped 5 minutes after the third dropping of the artificial urine. A weight was placed on top to achieve a pressure of 30 g / cm 2 After 3 minutes, the 60 pieces of filter paper were taken out and the post-test mass: m4 (g) was measured. The "Rewet (g)" is calculated according to the following formula. Rewet (g) = m4 - m3

[0158]

Table 1

[0159] From Table 1, it can be seen that urine collection pad No. 1 has a shorter liquid flow length, a shorter diffusion length on the liquid-permeable sheet side, and a longer diffusion length on the liquid-impermeable sheet side compared to urine collection pads No. 2 and No. 3. From these results, it can be understood that urine collection pad No. 1 can repeatedly slide artificial urine onto the absorption core while suppressing the spread of artificial urine on the skin contact surface of the liquid-permeable sheet, and is excellent in repeated absorbency over time.

[0160] [Production Example 2] 50.0 parts by mass of Panacet 810S (manufactured by NOF Corporation) as an oily component, 49.0 parts by mass of glycerin, and 1.0 part by mass of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form Gel Composition No. 2. Gel Composition No. 2 was applied to an air-through nonwoven fabric (basis weight: 30 g / m 2 ) in a range of 400 m × 80 mm so that the basis weight became 20 g / m 2 . The liquid-permeable sheet of a commercially available urine collection pad was peeled off, and the nonwoven fabric coated with Gel Composition No. 2 was pasted onto the commercially available urine collection pad as the liquid-permeable sheet so that Gel Composition No. 2 was on the non-skin side, and so that Gel Composition No. 2 was present starting from a position 30 mm from the end of the absorption core on the back side, to obtain urine collection pad No. 4.

[0161] [Production Example 3] 60.0 parts by mass of Panacet 810S (manufactured by NOF Corporation) as an oily component, 39.0 parts by mass of glycerin, and 1.0 part by mass of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form Gel Composition No. 3. In the same manner as in Production Example 2, urine collection pad No. 5 coated with Gel Composition No. 3 was obtained.

[0162] [Production Example 4] 70.0 parts by mass of Panacet 810S (manufactured by NOF Corporation) as an oily component, 29.0 parts by mass of glycerin, and 1.0 part by mass of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form Gel Composition No. 4. In the same manner as in Production Example 2, a urine collection pad No. 6 coated with Gel Composition No. 4 was obtained.

[0163] [Production Example 5] 80.0 parts by mass of Panacet 810S (manufactured by NOF Corporation) as an oily component, 19.0 parts by mass of glycerin, and 1.0 part by mass of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form Gel Composition No. 5. In the same manner as in Production Example 2, a urine collection pad No. 7 coated with Gel Composition No. 5 was obtained.

[0164] [Comparative Production Example 2] The surface treatment agent in Example 1 of JP-A-2022-34252 (hereinafter referred to as "Surface Treatment Agent No. 1") was produced. In place of the peach leaf extract and argan oil, macadamia nut oil was used. In the same manner as in Production Example 2, a urine collection pad No. 8 coated with Surface Treatment Agent No. 1 was obtained.

[0165] [Comparative Production Example 3] The surface treatment agent in Example 3 of JP-A-2022-34252 (hereinafter referred to as "Surface Treatment Agent No. 2") was produced. In place of the peach leaf extract and argan oil, macadamia nut oil was used. In the same manner as in Production Example 2, a urine collection pad No. 9 coated with Surface Treatment Agent No. 2 was obtained.

[0166] [Comparative Production Example 4] The surface treatment agent in Example 5 of JP-A-2022-34252 (hereinafter referred to as "Surface Treatment Agent No. 3") was produced. In place of the peach leaf extract and argan oil, macadamia nut oil was used. In the same manner as in Production Example 2, a urine collection pad No. 10 coated with Surface Treatment Agent No. 3 was obtained.

[0167] [Comparative Production Example 5] The liquid-permeable sheet of a commercially available urine collection pad was peeled off, and an air-through nonwoven fabric (basis weight: 30 g / m 2 ) was obtained in the same manner as in Production Example 1 except that it was attached to a commercially available urine collection pad as the liquid-permeable sheet, to obtain Urine Collection Pad No. 11.

[0168] [Examples 2 to 5 and Comparative Examples 2 to 5] [Liquid flow length] The liquid flow length was measured for each of Urine Collection Pads No. 4 to No. 11. The method for measuring the liquid flow length is as described above. The results are shown in Table 2.

[0169]

Table 2

[0170] It can be seen that Urine Collection Pads No. 4 to No. 7 (Examples 2 to 5) have a shorter liquid flow length compared to Urine Collection Pads No. 8 to No. 11 (Comparative Examples 2 to 4). Therefore, even when the fiber treatment agent in JP-A-2022-34252 is applied like the gel-like composition of the present application, it is inferior in liquid flow length compared to the present invention, and it can be seen that the liquid easily spreads on the skin contact surface of the liquid-permeable sheet.

Explanation of reference numerals

[0171] 1 Sanitary napkin 3 Liquid-permeable sheet 5 Liquid-impermeable sheet 7 Absorbent body 7a Absorbent core 7b Core wrap 9 Side sheet 15 Skin contact surface 17 Non-skin side 51 Material 53 Skin contact surface 55 Non-skin contact surface

Claims

Claim 1 An absorbent article comprising a liquid-permeable sheet having a skin-contact surface and a non-skin side surface, a liquid-impermeable sheet, and an absorbent core therebetween, wherein a gel composition containing an oily component, a biosurfactant, and a polyhydric alcohol is present in a material including the liquid-permeable sheet, the gel composition being disposed closer to the liquid-permeable sheet side than the absorbent core, and in the material, the amount of the gel composition present on the skin-contact surface of the liquid-permeable sheet is less than the amount of the gel composition present on the non-skin-contact surface disposed closer to the liquid-impermeable sheet side than the skin-contact surface of the liquid-permeable sheet, characterizing the absorbent article. Claim 2 The absorbent article according to claim 1, wherein the amount of the gel composition present on the skin-contact surface is 0. Claim 3 The absorbent article according to claim 1 or 2, wherein the non-skin-contact surface is the non-skin side surface of the liquid-permeable sheet. Claim 4 The following (i) and (ii), (i) the material further includes a second sheet disposed between the liquid-permeable sheet and the absorbent core, and the non-skin-contact surface is the skin side surface or the non-skin side surface of the second sheet, (ii) the material further includes a core wrap that covers the absorbent core from the liquid-permeable sheet side, and the non-skin-contact surface is the skin side surface or the non-skin side surface of the core wrap, The absorbent article according to claim 1 or 2, satisfying at least one of the above. Claim 5 The absorbent article according to claim 1 or 2, wherein the gel composition is configured to form an emulsion of the oily component when coming into contact with moisture. Claim 6 The absorbent article according to claim 1 or 2, wherein the gel composition has a viscosity of 50 to 1,000 Pa·s at 36°C and a shear rate of 0.28 (1 / s). Claim 7 The absorbent article according to claim 1 or 2, wherein the gel composition contains the oily component, the polyhydric alcohol, and the biosurfactant in a ratio of 40.0 to 94.9% by mass, 5.0 to 59.9% by mass, and 0.1 to 5.0% by mass based on their total mass. Claim 8 The absorbent article according to claim 1 or 2, wherein the biosurfactant is selected from the group consisting of surfactin, arthrofactin, iturin, and salts thereof, and any combination thereof. Claim 9 The absorbent article according to claim 1 or 2, wherein the polyhydric alcohol is an alcohol having three or more valences or a polyether of a dihydric alcohol.

10. The oil-based component has a kinematic viscosity of 0.01 to 80 mm 2 / s at 40°C, a water retention rate of 0.01 to 4.0% by mass, and a weight average molecular weight of less than 1,000. The absorbent article according to claim 1 or 2.

11. The oily component is (a 1 ) an ester of a chain hydrocarbon tetrol and at least one fatty acid, (a 2 ) an ester of a chain hydrocarbon triol and at least one fatty acid, (a 3 ) an ester of a chain hydrocarbon diol and at least one fatty acid, (b 1 ) an ether of a chain hydrocarbon tetrol and at least one aliphatic monohydric alcohol, (b 2 ) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b 3 ) an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c 1 ) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, (c 2 ) an ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol, (c 3 ) an ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol, (d 1 ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d 2 ) a dialkyl ketone, (d 3 ) an ester of a fatty acid and an aliphatic monohydric alcohol, (d 4 ) a dialkyl carbonate, (e 1 ) a polyoxy C 3 ~C 6 alkylene glycol, (e 2 ) an ester of a polyoxy C 3 ~C 6 alkylene glycol and at least one fatty acid, (e 3 ) an ether of a polyoxy C 3 ~C 6 alkylene glycol and at least one aliphatic monohydric alcohol, and (f 1 ) a chain alkane, and an absorbent article according to claim 1 or 2, which is selected from the group consisting of any combination thereof.

12. The absorbent article according to claim 1 or 2, wherein the gel composition further contains a drug.

13. The absorbent article according to claim 1 or 2, wherein the oily component further contains a warming agent and / or a cooling agent.

14. The absorbent article according to claim 1 or 2, which satisfies the relationship that the amount of the gel composition present on the skin-contact surface is less than the amount of the gel composition present on the non-skin-contact surface in a range overlapping in the thickness direction of the absorbent core and the absorbent article.

15. The absorbent article according to claim 1 or 2, wherein the gel composition is arranged in a line shape, dot shape or particle shape on the non-skin-contact surface.

Images