Absorbent articles

Abstract

To provide an absorbent article that has excellent repeat absorbency over time and is provided with a gel composition that does not readily change its position over time and can repeatedly cause body fluid to slide down over time.SOLUTION: An absorbent article 1 comprises a liquid-permeable sheet 2, a liquid-impermeable sheet, and an absorber 3 therebetween. The liquid-permeable sheet 2 comprises a gel composition 6 that includes an oily component, a polyhydric alcohol and a biosurfactant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This disclosure relates to absorbent articles. [Background technology]

[0002] In order to allow bodily fluids such as menstrual blood to slide into the absorbent material, a prescribed blood-lubricating agent is applied to the absorbent material. For example, Patent Document 1 describes an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent between the liquid-permeable top sheet and the liquid-impermeable back sheet, wherein the liquid-permeable top sheet has an uneven structure on its skin-contacting surface that includes convex portions and concave portions, and the liquid-permeable top sheet has at least the convex portions in the area that contacts the excretory opening, with a moisture content of 0.01 to 80 mm at 40°C. 2 An absorbable article is disclosed that contains a blood lubrication agent having a kinematic viscosity of / s, a water content of 0.01 to 4.0 mass%, and a weight-average molecular weight of less than 1,000. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2013-179982 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In the absorbent article described in Patent Document 1, the blood lubrication agent efficiently causes blood to slide into the absorbent article, and after absorbing menstrual blood, the top sheet does not feel sticky and remains dry. However, due to its properties, the blood lubrication agent tends to migrate from the liquid-permeable top sheet, and there is room for improvement. Therefore, the present disclosure aims to provide an absorbent article that has excellent repeated absorption over time, comprising a gel-like composition that does not easily change its position over time and can repeatedly slide off bodily fluids over time. [Means for solving the problem]

[0005] The Disclosers have found an absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent between them, wherein the liquid-permeable sheet comprises a gel-like composition containing an oily component, a polyhydric alcohol, and a biosurfactant. [Effects of the Invention]

[0006] The absorbent article of this disclosure comprises a gel-like composition that does not easily change position over time and can repeatedly slide off bodily fluids over time, and thus exhibits excellent repeated absorption over time. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a plan view of the sanitary napkin 1 in the first embodiment. [Figure 2] Figure 2 is a plan view of the sanitary napkin 1 in the second embodiment. [Modes for carrying out the invention]

[0008] Specifically, this disclosure relates to the following aspects: [Aspect 1] An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent between them, The above liquid-permeable sheet comprises a gel-like composition containing an oily component, a polyhydric alcohol, and a biosurfactant. The absorbent article characterized by the above.

[0009] In the above-mentioned absorbent article, the liquid-permeable sheet comprises a gel-like composition containing an oily component. Because the gel-like composition is gel-like and has a certain viscosity, it is less likely to change position even when a predetermined pressure (for example, the pressure during storage (transportation) of the absorbent article) is applied. In other words, in the above-mentioned absorbent article, the gel-like composition does not easily change its position over time.

[0010] Furthermore, while the oily component in a gel-like composition is a component that allows liquids such as bodily fluids to slide onto the absorbent material, the oily component itself is lipophilic, so changes in the state of the oily component may change the absorbency of the liquid. For example, if the oily component changes from being uniformly distributed as fine particles on a liquid-permeable sheet to being unevenly distributed as large droplets on the liquid-permeable sheet, the lipophilic oily component may repel hydrophilic liquids, preventing the liquid from sliding onto the absorbent material and making it more likely to remain on the liquid-permeable sheet.

[0011] In the above-mentioned absorbent article, since the oily component exists in a gel-like state together with the polyhydric alcohol and biosurfactant, the gel-like composition maintains a certain affinity for liquids even when stored for a long period of time, especially at high temperatures.

[0012] Therefore, whether immediately after manufacture or after a certain period of time has elapsed since manufacture, when the absorbent article is used and a liquid such as bodily fluids (first time) reaches the liquid-permeable sheet, the gel-like composition containing hydrophilic components (polyhydric alcohols) and biosurfactant blends with the liquid, and a portion of the gel-like composition containing lipophilic components (oil components), hydrophilic components (polyhydric alcohols), and biosurfactant rapidly forms an emulsion of oily components (first time). A portion of this emulsion of oily components (first time) causes the liquid to slide down onto the absorbent, while the remainder remains on the liquid-permeable sheet.

[0013] When the liquid (second time) reaches the permeable sheet, the remaining oily emulsion (first time) allows the liquid to slide quickly onto the absorbent. Furthermore, when the liquid (second time) reaches the permeable sheet, a portion of the gel-like composition forms another oily emulsion (second time), and a portion of this oily emulsion (second time) slides the liquid onto the absorbent, while the remainder remains on the permeable sheet. By repeating these steps, the absorbent material described above can repeatedly shed menstrual blood, both immediately after manufacture and after a certain period of time has elapsed since manufacture, demonstrating excellent repeated absorption over time.

[0014] [Aspect 2] The absorbent article according to embodiment 1, wherein the gel-like composition is configured to form an emulsion of the oily component when it comes into contact with water. In the above-described absorbent article, the gel-like composition is configured to form an emulsion of oily components upon contact with moisture, thereby allowing the effects of Embodiment 1 to be more fully realized.

[0015] [Aspect 3] The absorbent article according to embodiment 2, wherein the emulsion has an average particle size of 0.5 to 5.0 μm.

[0016] In the above absorbent article, since the emulsion of the oily component formed from the gel-like composition has a predetermined average particle size, multiple emulsions of the oily component are more easily arranged on the surface of the liquid-permeable sheet, and the multiple emulsions make it easier for the liquid to slide onto the absorbent material.

[0017] [Aspect 4] The absorbent article according to embodiment 3, wherein the liquid-permeable sheet is composed of a nonwoven fabric containing fibers having an average fiber diameter of 5 to 60 μm.

[0018] In the above absorbent article, since the liquid-permeable sheet is made of a predetermined nonwoven fabric, the emulsion of oily components is more easily arranged on the surface of the fibers, and the emulsion of oily components arranged on the surface of the fibers makes it easier for the liquid to slide onto the absorbent material.

[0019] [Aspect 5] The absorbent article according to any one of embodiments 1 to 4, wherein the gel-like composition has a viscosity of 50 to 1,000 Pa·s at 36°C and a shear rate of 0.28 (1 / s).

[0020] In the above-mentioned absorbent article, the gel-like composition has a predetermined viscosity at a shear rate equivalent to that of the wearer's body temperature and during storage. Therefore, when the absorbent article is worn, the gel-like composition does not easily change position, and when liquid reaches the liquid-permeable sheet, an emulsion of the oily component is easily formed.

[0021] [Aspect 6] The absorbent article according to any one of embodiments 1 to 5, wherein the gel-like composition contains the oily component, the polyhydric alcohol, and the biosurfactant in the following proportions based on their total mass: 60.0 to 94.9% by mass, 5.0 to 39.9% by mass, and 0.1 to 5.0% by mass.

[0022] In the above-mentioned absorbent article, since the gel-like composition has a predetermined composition, the effects of Embodiment 1 are more easily achieved.

[0023] [Aspect 7] The absorbent article according to any one of embodiments 1 to 6, wherein the biosurfactant is selected from the group consisting of surfactant, arsolofactin, iturine, and salts thereof, and any combination thereof.

[0024] In the above absorbent article, since the biosurfactant is selected from a predetermined group, when the gel-like composition comes into contact with a liquid, an emulsion of the oily component is more easily formed, making it easier to exhibit the effects of Embodiment 1.

[0025] [Aspect 8] The absorbent article according to any one of embodiments 1 to 7, wherein the polyhydric alcohol is a trihydric or higher alcohol, or a polyether of a dihydric alcohol. In the absorbent article described above, since the polyhydric alcohol is selected from a predetermined range, when the gel-like composition comes into contact with the liquid, the polyhydric alcohol dissolves more easily in the liquid, making it easier to achieve the effects of Embodiment 1.

[0026] [Aspect 9] The above oily components are present in a volume of 0.01 to 80 mm at 40°C.2 An absorbent article according to any one of embodiments 1 to 8, having a kinematic viscosity of / s, a water content of 0.01 to 4.0 mass%, and a weight-average molecular weight of less than 1,000.

[0027] In the above-mentioned absorbent article, since the oily component has a predetermined kinematic viscosity, water content, and weight-average molecular weight, the oily component makes it easier for bodily fluids to slide from the liquid-permeable sheet onto the absorbent material, thereby making it easier to exhibit the effects of Embodiment 1.

[0028] [Aspect 10] The above oily components include: (a1) an ester of a linear hydrocarbon tetraol and at least one fatty acid; (a2) an ester of a linear hydrocarbon triol and at least one fatty acid; (a3) ​​an ester of a linear hydrocarbon diol and at least one fatty acid; (b1) an ether of a linear hydrocarbon tetraol and at least one aliphatic monohydric alcohol; (b2) an ether of a linear hydrocarbon triol and at least one aliphatic monohydric alcohol; (b3) an ether of a linear hydrocarbon diol and at least one aliphatic monohydric alcohol; (c1) an ester of a linear hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol; (c2) a linear hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups, and at least An absorbent article according to any one of embodiments 1 to 9, selected from the group consisting of (c3) an ester of one aliphatic monohydric alcohol, (d1) an ether of 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.

[0029] In the absorbent article described above, since the oily component is selected from a predetermined range, the oily component makes it easier for bodily fluids to slide from the liquid-permeable sheet onto the absorbent material, thereby making it easier to achieve the effects of Embodiment 1.

[0030] [Aspect 11] The absorbent article according to any one of embodiments 1 to 10, wherein the above gel-like composition further comprises a drug.

[0031] In the absorbent article described above, the gel-like composition further contains a drug. Therefore, each time the gel-like composition comes into contact with a liquid when the absorbent article is worn, the drug is released from the gel-like composition, and a portion of it can act on the wearer's skin, etc., so that the drug can act on the wearer's skin for a long period of time.

[0032] [Aspect 12] The absorbent article according to any one of embodiments 1 to 11, wherein the above-mentioned oily component further comprises a warming agent and / or a cooling agent.

[0033] In the absorbent article described above, 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, the warming agent and / or cooling agent are less likely to exert their effects before the liquid reaches the permeable sheet, and each time the liquid reaches the permeable sheet, the oily component is emulsified with the warming agent and / or cooling agent and placed on the surface of the permeable sheet, allowing the warming agent and / or cooling agent to act on the wearer's skin for an extended period of time.

[0034] [Aspect 13] The absorbent article according to any one of embodiments 1 to 12, wherein the gel-like composition is placed in a region of the liquid-permeable sheet that is in direct contact with bodily fluids.

[0035] In the absorbent article described above, since the gel-like composition is positioned in a predetermined location, an emulsion of oily components is more easily formed rapidly from the gel-like composition, making it easier to achieve the effects of Embodiment 1.

[0036] [Aspect 14] The absorbent article according to any one of Aspects 1 to 13, wherein the gel composition is arranged in a line shape, dot shape, or particle shape on the skin-contact surface of the liquid-permeable sheet.

[0037] In the absorbent article, since the gel composition is arranged in a predetermined state on the skin-contact surface of the liquid-permeable sheet, it is difficult to inhibit the absorbency of the absorbent article, and it becomes easier to exhibit the effect of Aspect 1.

[0038] The absorbent article of the present disclosure will be described in detail below. [Oil-based component] The oil-based component has the same action as the blood lubricity-imparting agent described in Patent Document 1, and has a role of causing not only menstrual blood but also body fluids such as urine to slide from the liquid-permeable sheet into the absorbent body.

[0039] The oil-based component preferably has a kinematic viscosity of 0 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 mm 2 / s.

[0040] Also, since the oil-based component has a kinematic viscosity of 0 to 80 mm 2 / s at 40°C, it is preferable that the melting point of the oil-based component is not more than 45°C. This is because when the oil-based 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 kinematic viscosity exceeds 80 mm 2 / s, the viscosity of the oil-based component is high, and it tends to be difficult to slide from the liquid-permeable sheet into the absorbent body together with the liquid that has reached the skin-contact surface of the liquid-permeable sheet.

[0041] The kinematic viscosity described above can be measured at a test temperature of 40°C using a Cannon-Fenske backflow viscometer, in accordance with "5. Kinematic Viscosity Test Method" of JIS K 2283:2000.

[0042] The above oily component preferably has a water content of 0.01 to 4.0% by mass, more preferably 0.02 to 3.5% by mass, even 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.

[0043] In this specification, "water retention" means the proportion of water that a substance can hold, and can be measured as follows: (1) Leave the test tube, rubber stopper, substance to be measured, and deionized water undisturbed in a constant temperature room at 40°C for 24 hours. (2) In the constant temperature chamber described above, add 5.0 g of the substance to be measured and 5.0 g of deionized water to a 20 mL test tube. (3) In the constant temperature chamber described above, stopper the mouth of the test tube with a rubber stopper, rotate it once, and leave it standing for 5 minutes.

[0044] (4) In the constant temperature room described above, take 3.0 g of the layer of substance to be measured (usually the upper layer) into 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 water, and measure the mass of the petri dish (mass: W1). (6) The water retention rate is calculated according to the following formula. Water retention rate (%)=100×(W0-W1) / 3.0 Measurements will be taken three times, and the average value will be used.

[0045] The above-mentioned oily component has a weight-average molecular weight of less than 1,000, and preferably less than 900. This is because if the weight-average molecular weight is 1,000 or more, the oily component itself tends to become tacky, causing discomfort to the wearer. The above-mentioned oily 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 if the weight-average molecular weight is too low, the vapor pressure of the oily component increases, which can cause it to vaporize during storage, leading to a decrease in volume and problems such as odor when worn.

[0046] In this specification, "weight-average molecular weight" is a concept that includes polydisperse compounds (e.g., compounds produced by stepwise polymerization, esters produced from multiple fatty acids and multiple aliphatic monohydric alcohols) and single compounds (e.g., esters produced from one type of fatty acid and one type of aliphatic monohydric alcohol). i Individual molecular weight M i In a system consisting of molecules (i=1, or i=1,2...), the following equation applies: M w =ΣN i M i 2 / ΣN i M i M is required by w It means...

[0047] In this specification, weight-average molecular weight refers to the value on a polystyrene basis, determined by gel permeation chromatography (GPC). Examples of GPC measurement conditions include the following: Model: Hitachi High-Technologies Corporation Lachrom Elite High-Performance Liquid Chromatography System Columns: SHODEX KF-801, KF-803, and KF-804 manufactured by Showa Denko Corporation Eluent:THF Flow rate: 1.0mL / min Injection amount: 100μL Detection: RI (Differential Refractometer)

[0048] Examples of the above oily components include: (a1) an ester of a linear hydrocarbon tetraol and at least one fatty acid, (a2) an ester of a linear hydrocarbon triol and at least one fatty acid, (a3) ​​an ester of a linear hydrocarbon diol and at least one fatty acid, (b1) an ether of a linear hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b2) an ether of a linear hydrocarbon triol and at least one aliphatic monohydric alcohol, (b3) an ether of a linear hydrocarbon diol and at least one aliphatic monohydric alcohol, (c1) an ester of a linear hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having four carboxyl groups and at least one aliphatic monohydric alcohol, and (c2) a linear hydrocarbon tricarboxylic acid having three carboxyl groups Examples include (c3) esters of hydroxy acids, alkoxy acids or oxo acids with at least one aliphatic monohydric alcohol, (d1) ethers of 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) linear alkanes.

[0049] [(a1) Ester of a chain-like hydrocarbon tetraol with at least one fatty acid] (a1) Examples of esters of a chain hydrocarbon tetraol and at least one fatty acid include tetraesters of pentaerythritol and fatty acids, triesters of pentaerythritol and fatty acids, diesters of pentaerythritol and fatty acids, and monoesters of pentaerythritol and fatty acids.

[0050] Examples of the above fatty acids include saturated fatty acids, such as C2-C2 fatty acids. 30Saturated fatty acids, for example, acetic acid (C2) (C2 means the number of carbon atoms, the same applies hereafter), propanoic acid (C3), butanoic acid (C4) and their 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 their 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 Examples include these isomers, as well as others not listed.

[0051] The above fatty acids can also be unsaturated fatty acids. Examples of the above unsaturated fatty acids include C3-C3 fatty acids. 20 Unsaturated fatty acids, for example, monounsaturated fatty acids, for example, crotonic acid (C4), myristoleic acid (C4) 14 ), palmitoleic acid (C 16 ), oleic acid (C 18 ), elaidic acid (C 18 ), vaccenic acid (C 18 ), gadoleic acid (C 20 ), eicosenoic acid (C 20 ) and other diunsaturated fatty acids, for example, linoleic acid (C 18 ), eicosadienoic acid (C 20 ) and other triunsaturated fatty acids, for example, linolenic acid, for example, alpha-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-eleostearate (C 18 ), Mead acid (C 20 ), dihomo-γ-linolenic acid (C 20 ), eicosatrienoic acid (C 20 ) and other tetraunsaturated fatty acids, for example, stearidonic acid (C 20 ), arachidonic acid (C 20 ), eicosatetraenoic acid (C 20 ) and other pentaunsaturated fatty acids, for example, boseopentaenoic acid (C 18 ), eicosapentaenoic acid (C 20 Examples include ) and their partial hydrogen adducts.

[0052] Considering the possibility of denaturation due to oxidation, etc., the ester of pentaerythritol and fatty acid described above is preferably derived from a saturated fatty acid, i.e., an ester of pentaerythritol and a saturated fatty acid. Furthermore, from the viewpoint of reducing the water content, the ester of pentaerythritol and fatty acid is preferably a diester, triester, or tetraester, more preferably a triester or tetraester, and even more preferably a tetraester.

[0053] Examples of commercially available esters of pentaerythritol and fatty acids include Unistar H-408BRS, H-2408BRS-22 (mixture), etc. (both manufactured by NOF Corporation).

[0054] [(a2) Esters of a chain-like hydrocarbon triol with at least one fatty acid] (a2) Examples of esters of a chain hydrocarbon triol and at least one fatty acid include triesters of glycerol and fatty acids, diesters of glycerol and fatty acids, and monoesters of glycerol and fatty acids.

[0055] The fatty acids mentioned above are as described above. The ester of glycerin and fatty acid is preferably a diester or a triester, and more preferably a triester, from the viewpoint of reducing the water content.

[0056] Examples of triesters of the above-mentioned glycerin with two or more fatty acids include glycerin and octanoic acid (C8) and decanoic acid (C8). 10 ) triester, glycerin, octanoic acid (C8), decanoic acid (C 10 ) and dodecanoic acid (C 12 ) triester, glycerin, octanoic acid (C8), decanoic acid (C 10 ), dodecanoic acid (C 12 ), tetradecanoic acid (C 14 ), hexadecanoic acid (C 16 ) and octadecanoic acid (C 18 Examples include Triesters with )

[0057] From the perspective of having a melting point of 45°C or lower, it is preferable that the above-mentioned triester of glycerin and fatty acid has a total number of carbon atoms of the fatty acids constituting the triester of glycerin and fatty acid of approximately 40 or less.

[0058] Examples of commercially available triesters of glycerin and fatty acids include coconut oil fatty acid glyceride, NA36, Panacete 800, Panacete 800B and Panacete 810S, as well as tri-C2L oil fatty acid glyceride and tri-Cl oil fatty acid glyceride (all manufactured by NOF Corporation).

[0059] [(a3) Esters of a linear hydrocarbon diol and at least one fatty acid] (a3) Examples of esters of a chain hydrocarbon diol and at least one fatty acid include monoesters or diesters of a fatty acid with a C2-C6 chain hydrocarbon diol, for example, a C2-C6 glycol, for example, ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, or hexylene glycol.

[0060] Examples of the above fatty acids include those listed in "(a1) Esters of a chain-like hydrocarbon tetraol and at least one fatty acid." As for the esters of C2-C6 glycols and fatty acids mentioned above, considering the possibility of denaturation due to oxidation, etc., it is preferable that the esters of C2-C6 glycols and fatty acids are derived from saturated fatty acids, that is, esters of C2-C6 glycols and saturated fatty acids.

[0061] Furthermore, from the viewpoint of reducing the water content, the ester of the above-mentioned C2-C6 glycol and fatty acid is preferably an ester of glycol and fatty acid derived from a glycol with a large number of carbon atoms, such as butylene glycol, pentylene glycol, or hexylene glycol. Furthermore, from the viewpoint of reducing the water content, the ester between the C2-C6 glycol and the fatty acid is preferably a diester. Examples of commercially available esters of the above-mentioned C2-C6 glycols with fatty acids include Compol BL and Compol BS (both manufactured by NOF Corporation).

[0062] [(b1) Ethers of a linear hydrocarbon tetraol and at least one aliphatic monohydric alcohol] (b1) Examples of ethers of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol include tetraethers, triethers, diethers, and monoethers of pentaerythritol and an aliphatic monohydric alcohol.

[0063] Examples of aliphatic monohydric alcohols include saturated aliphatic monohydric alcohols and unsaturated aliphatic monohydric alcohols. Examples of the saturated aliphatic monohydric alcohols mentioned above include C1-C 20Saturated aliphatic monohydric alcohols, for example, methyl alcohol (C1) (C1 indicates the number of carbon atoms, the same applies hereafter), ethyl alcohol (C2), propyl alcohol (C3) and their isomers, for example, isopropyl alcohol (C3), butyl alcohol (C4) and its isomers, for example, sec-butyl alcohol (C4) and tert-butyl alcohol (C4), pentyl alcohol (C5), hexyl alcohol (C6), heptyl alcohol (C7), octyl alcohol (C8) and their isomers, for example, 2-ethylhexyl alcohol (C8), nonyl alcohol (C9), decyl alcohol (C 10 ), dodecyl alcohol (C 12 ), tetradecyl alcohol (C 14 ), hexadecyl alcohol (C 16 ), hepradecyl alcohol (C 17 ), octadecyl alcohol (C 18 ), and eicosyl alcohol (C 20 ), as well as these isomers not listed, are also included.

[0064] Examples of the above-mentioned unsaturated aliphatic monohydric alcohols include those obtained by substituting one of the C=C single bonds of the above-mentioned saturated aliphatic monohydric alcohol 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 Rikacol series and Angecool series.

[0065] [(b2) ethers of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol] (b2) Examples of ethers of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol include triethers, diethers, and monoethers of glycerin and aliphatic monohydric alcohol. The above aliphatic monohydric alcohols are as described above.

[0066] [(b3) Ethers of a linear hydrocarbon diol and at least one aliphatic monohydric alcohol] (b3) Examples of ethers 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 aliphatic monohydric alcohols are as described above.

[0067] [(c1) Esters of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having four carboxyl groups, and at least one aliphatic monohydric alcohol] (c1) Examples of esters 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 monoesters, diesters, triesters, and tetraesters 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 diesters, triesters, and tetraesters, more preferably triesters and tetraesters, and even more preferably tetraesters.

[0068] Examples of the above-mentioned chain-like hydrocarbon tetracarboxylic acids include alkanetetracarboxylic acids, such as butanetetraic acid, pentanetetraic acid, hexanetetraic acid, heptanetetraic acid, octanotetraic acid, nonanetetraic acid, and decanetetraic acid. The above aliphatic monohydric alcohols are as described above.

[0069] [(c2) Esters of a chain-like hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having three carboxyl groups, and at least one aliphatic monohydric alcohol] (c2) Examples of esters of a chain-like hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol include monoesters, diesters, and triesters of a chain-like 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.

[0070] Examples of the above-mentioned chain-like hydrocarbon tricarboxylic acids include alkane tricarboxylic acids, such as propane triacid, butane triacid, pentane triacid, hexane triacid, heptane triacid, octane triacid, nonane triacid, and decane triacid. The above aliphatic monohydric alcohols are as described above. An example is tributyl o-acetylcitrate, which is commercially available.

[0071] [(c3) Esters of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups, and at least one aliphatic monohydric alcohol] (c3) Examples of esters of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol include monoesters and diesters, preferably diesters, of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol.

[0072] Examples of the above-mentioned chain-like hydrocarbon dicarboxylic acids include alkanediolic acids, such as ethanedioic acid, propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanodioic acid, nonanedioic acid, and decanedioic acid. The above-mentioned aliphatic monohydric alcohols are as described above. One example is dioctyl adipic acid, which is commercially available.

[0073] [(d1) ethers of aliphatic monohydric alcohols] The ether between the above aliphatic monohydric alcohols is given by the following formula (1): R 1 Ure 2 (1) (In the formula, R 1 and R 2 Each of these is a chain hydrocarbon. Examples of compounds having this feature include In formula (1), R is a monohydric alcohol that constitutes the above ether. 1 OH and R 2 As for the equivalent of OH, it is as described above.

[0074] [(d2) dialkylketone] The above dialkylketone is given by the following formula (2): R 3 COR 4 (2) (In the formula, R 3 and R 4 Each of them is an alkyl group. Examples of compounds having this feature include The above-mentioned dialkyl ketones are commercially available, or can be obtained by known methods, such as oxidizing a secondary alcohol with chromic acid.

[0075] [(d3) Esters of fatty acids and aliphatic monohydric alcohols] For example, the following formula (3) shows an ester between the above fatty acid and an aliphatic monohydric alcohol: R 5 COOR 6 (3) (In the formula, R 5 and R 6 (Each of these is a chain hydrocarbon.) Examples of compounds having this feature include

[0076] The fatty acids that make up the above 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 ester (in formula (3), R 6 corresponding to OH) includes, for example, the above-mentioned aliphatic monohydric alcohols.

[0077] Examples of the ester of the above-mentioned fatty acid and aliphatic monohydric alcohol include, for example, an ester of dodecanoic acid (C 12 ) and dodecyl alcohol (C 12 ), an ester of tetradecanoic acid (C 14 ) and dodecyl alcohol (C 12 ), etc. Examples of commercially available products of the ester of the above-mentioned fatty acid and aliphatic monohydric alcohol include, for example, Electol WE20 and Electol WE40 (both manufactured by NOF Corporation).

[0078] [(d4) Dialkyl carbonate] Examples of the above-mentioned 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 this are included. In addition to being commercially available, the above-mentioned dialkyl carbonate can be synthesized by the reaction of phosgene and alcohol, the reaction of chloroformate ester and alcohol or alcoholate, and the reaction of silver carbonate and alkyl iodide.

[0079] [(e1) Polyoxy C3-C6 alkylene glycol] The above polyoxy C3-C6 alkylene glycol means i) a homopolymer having one skeleton selected from the group consisting of an oxy C3-C6 alkylene skeleton, i.e., an oxypropylene skeleton, an oxybutylene skeleton, an oxypentylene skeleton, and an oxyhexylene skeleton, and having hydroxyl groups at both ends; ii) a block copolymer having two or more skeletons selected from the above group and having hydroxyl groups at both ends; or iii) a random copolymer having two or more skeletons selected from the above group and having hydroxyl groups at both ends. Examples of commercially available polyC3-C6 alkylene glycols include Uniol™ PB-500 and PB-700 (both manufactured by NOF Corporation).

[0080] [(e2) Esters of polyoxy C3-C6 alkylene glycol with at least one fatty acid] Examples of esters of the above-mentioned polyoxy C3-C6 alkylene glycol with at least one fatty acid include those in which one or both of the OH ends of the polyoxy C3-C6 alkylene glycol, as described in the section "(e1) Polyoxy C3-C6 alkylene glycol", are esterified with a fatty acid, i.e., monoesters and diesters. The above fatty acids are as described above.

[0081] [(e3) Ethers of polyoxy C3-C6 alkylene glycols and at least one aliphatic monohydric alcohol] Examples of ethers of the above-mentioned polyoxy C3-C6 alkylene glycol and at least one aliphatic monohydric alcohol include those in which one or both of the OH ends of the polyoxy C3-C6 alkylene glycol, as described in the section "(e1) Polyoxy C3-C6 alkylene glycol", are etherified by an aliphatic monohydric alcohol, i.e., monoethers and diethers. The above-mentioned aliphatic monohydric alcohols are as described above.

[0082] [(f1) Chain-like alkanes] (f1) Examples of chain-like alkanes include straight-chain alkanes and branched-chain alkanes. Examples of commercially available hydrocarbons include Pearlream 6 (NOF Corporation).

[0083] <Polyhydric alcohols> The above-mentioned polyhydric alcohol refers to an alcohol with a hydrity of 2 or more, and examples include dihydric alcohols, trihydric alcohols, tetrahydric alcohols, pentahydric alcohols, hexahydric or higher alcohols, and ethers thereof. Preferably, it is an alcohol with a hydrity of 3 or more, or a polyether of a dihydric alcohol. Examples of the above-mentioned dihydric alcohols include C2-C6 chain hydrocarbon diols, such as C2-C6 glycols, such as ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, or hexylene glycol.

[0084] Examples of the above-mentioned trihydric alcohols include the chain-like hydrocarbon triols mentioned above, such as glycerin. Examples of the tetrahydric alcohols mentioned above include the chain-like hydrocarbon tetraols described above, such as pentaerythritol. Examples of alcohols with a valency of 5 or higher include xylitol and sorbitol. Examples of the above-mentioned ethers include diethylene glycol, dipropylene glycol, diglycerin, triethylene glycol, tripropylene glycol, tetraethylene glycol, and tetrapropylene glycol.

[0085] <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 emulsan, and salts thereof, and any combinations thereof.

[0086] Due to the high stability of the gel-like composition, lipopeptide compounds and their salts are preferred as the above biosurfactant, surfactin, arthrofactin, iturin, and their salts are more preferred, and surfactin and its salts are even more preferred.

[0087] The salt of surfactin has the following formula (5) [Chemical formula] (In the formula, X represents an amino acid residue selected from the group consisting of leucine residue, isoleucine residue, and valine residue, R represents a C9-C 18 alkyl group, and M + represents an alkali metal ion or a quaternary ammonium ion.) It is represented by.

[0088] 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 represents 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.

[0089] M + Examples of alkali metal ions include lithium ions, sodium ions, and potassium ions. M + Examples of substituents on the quaternary ammonium ion include alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, and tert-butyl groups; aralkyl groups such as benzyl, methylbenzyl, and phenylethyl groups; and organic groups such as aryl groups such as phenyl, toluyl, and xyl groups. Examples of quaternary ammonium ions include tetramethylammonium ions, tetraethylammonium ions, and pyridinium ions.

[0090] Surfactin or its salts can be obtained by culturing microorganisms, such as strains belonging to Bacillus subtilis, according to known methods, and isolated from the culture medium. These may be purified products or used unpurified, for example, in the culture medium itself. Surfactin or its salts may also be synthesized.

[0091] <Gel-like composition> The above-mentioned gel-like composition is not particularly limited in composition as long as it is in gel form, but in order to facilitate the action of the gel-like composition, the above-mentioned oily component, the above-mentioned polyhydric alcohol, and the above-mentioned biosurfactant are preferably contained in the following proportions based on their total mass: preferably 60.0 to 94.9% by mass, 5.0 to 39.9% by mass, and 0.1 to 5.0% by mass, more preferably 69.7 to 92.0% by mass, 6.0 to 30.0% by mass, and 0.3 to 4.0% by mass, and even more preferably 75.0 to 90.0% by mass, 7.0 to 22.0% by mass, and 0.5 to 3.0% by mass.

[0092] The above gel-like 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). By having a predetermined viscosity at a shear rate near the wearer's body temperature and corresponding to storage conditions, the gel-like composition is less likely to change position when the absorbent article is worn, and an emulsion of oily components is more easily formed when liquid reaches the liquid-permeable sheet.

[0093] In this specification, the viscosity of the above-mentioned gel-like composition can be measured using the following instruments. • Equipment: 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

[0094] The above gel-like composition is preferably configured to form an emulsion of the oily component upon contact with moisture, and in this case, the emulsion has an average particle size of preferably 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm. This increases the number of oily component emulsions that are placed on the surface of the liquid-permeable sheet, and makes it easier for individual emulsions to slide liquid onto the absorbent.

[0095] In this specification, the particle size of the oily component emulsion formed from the above gel-like composition can be measured using the following apparatus. • Equipment: Microtrac-Bel laser diffraction scattering particle size distribution analyzer Emulsion formation conditions: Add 10.0 g of gel composition and 90.0 g of water to a 300 mL beaker, stir until there are no lumps of gel composition, and let stand for 10 minutes.

[0096] [Other ingredients] The above gel-like composition may further contain other components, provided that they do not inhibit its action. Other ingredients mentioned above include pearl-derived components. The pearl-derived components mentioned above are not particularly limited as long as they are derived from shellfish that have a nacreous layer. Examples of shellfish that have a nacreous layer include Akoya oysters, black-lipped oysters (black pearls), white-lipped oysters (South Sea pearls), mabe oysters (mabe pearls), abalone and other marine shellfish, freshwater pearls (hyriopsis schlegelii), and freshwater pearls (crow mussels).

[0097] The pearl-derived components mentioned above include the pulverized material, i.e., powder, of the nacreous shell, and the organic matter of the nacreous shell, such as the protein conchiolin, and peptides and amino acids derived from the organic matter, such as hydrolyzed conchiolin. The peptides and amino acids may be in liquid form.

[0098] Other ingredients mentioned above include, for example, fragrances and solvents. Other components mentioned above include, for example, silicone oil, silicone, and silicone-based resin. Other ingredients mentioned above include, for example, antioxidants such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylated hydroxyanisole), and propyl gallate.

[0099] Other components mentioned above include, for example, vitamins, such as natural vitamins or synthetic vitamins. Examples of vitamins include, for example, water-soluble vitamins, such as B vitamins, such as vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B7, vitamin B9, and vitamin B 12 Vitamin C is one example. Examples of the above vitamins include fat-soluble vitamins such as vitamin A, vitamin D, vitamin E, and vitamin K. The vitamins mentioned above also include their derivatives.

[0100] Other components mentioned above include, for example, amino acids such as alanine, arginine, lysine, histidine, proline, hydroxyproline, and peptides.

[0101] Other components mentioned above include, for example, zeolites, such as natural zeolites, such as anal stilbite, rhodochrosite, stilbite, natrolite, stilbite, and somosonite, as well as synthetic zeolites. Other ingredients mentioned above include, for example, cholesterol, hyaluronic acid, lecithin, and ceramide.

[0102] Other ingredients mentioned above include, for example, pharmaceuticals such as astringents, anti-acne agents, anti-wrinkle agents, anti-cellulite agents, whitening agents, antibacterial agents, antifungal agents, anti-inflammatory agents, warming agents, and cooling agents.

[0103] Examples of the above-mentioned skin astringents include zinc oxide, aluminum sulfate, tannic acid, and oil-soluble skin astringents, such as oil-soluble polyphenols. Examples of the above-mentioned oil-soluble polyphenols include natural oil-soluble polyphenols, such as Phellodendron amurense extract, Hypericum perforatum extract, Lamium album extract, Chamomile extract, Arctium lappa extract, Salvia japonica extract, Linden extract, Tilia cordata extract, Betula platyphylla extract, Equisetum arvense extract, Salvia japonica extract, Juglans mandshurica extract, Hibiscus cuspidata extract, Eriobotrya japonica leaf extract, Tilia cordata extract, Hop extract, Horse chestnut extract, and Coix lacryma-jobi extract.

[0104] Examples of the above-mentioned anti-acne agents include salicylic acid, benzoyl peroxide, resorcinol, sulfur, erythromycin, and zinc. Examples of the above-mentioned anti-wrinkle agents include lactic acid, salicylic acid, salicylic acid derivatives, glycolic acid, phytic acid, lipoic acid, and lysophosphatidic acid.

[0105] Examples of the above-mentioned anti-cellulite agents include xanthine compounds such as aminophylline, caffeine, theophylline, and theobromine. Examples of the above-mentioned whitening agents include niacinamide, kojic acid, arbutin, glucosamine and its derivatives, phytosterol derivatives, ascorbic acid and its derivatives, as well as mulberry extract and placental extract. Examples of the above anti-inflammatory agents include naturally derived anti-inflammatory agents such as peony, scutellaria, St. John's wort, chamomile, licorice, peach leaf, mugwort, and perilla extract, and synthetic anti-inflammatory agents such as allantoin and dipotassium glycyrrhizate.

[0106] Examples of the warming agents mentioned above include those that activate TRP channels, such as agonists for the TRPV1 receptor and agonists for the TRPV3 receptor, with agonists for TRPV1 being preferred. The TRPV1 receptor has a high activation temperature threshold of over 43°C, which can provide the wearer with a strong warming sensation.

[0107] The above-mentioned warming agent is preferably a plant-derived compound from the viewpoint of providing a sense of security to the wearer. Examples of the above-mentioned warming agent include capsicoside, capsaicin, capsaicinoids (dihydrocapsaicin, nordihydrocapsaicin, homodihydrocapsaicin, homocapsaicin, nonibamide, etc.), capsanthin, benzyl nicotinate, β-butoxyethyl nicotinate, N-acylvanylamide, vanillyl nonanoate, polyhydric alcohol, chili pepper powder, chili pepper tincture, chili pepper extract, vanillyl nonanoate, vanillyl alcohol alkyl ether derivatives (e.g., vanillyl ethyl ether, vanillyl butyl ether) Examples include vanillyl pentyl ether, vanillyl hexyl ether, isovanillyl alcohol alkyl ether, ethyl vanillyl alcohol alkyl ether, veratorial alcohol derivatives, substituted benzyl alcohol derivatives, substituted benzyl alcohol alkyl ether, vanillin propylene glycol acetal, ethyl vanillin propylene glycol acetal, ginger extract, ginger oil, gingerol, zingerone, hesperidin, and pyrrolidone carboxylic acid, as well as any combination thereof.

[0108] The above-mentioned warming agent is preferably not capsaicin, from the viewpoint of minimizing pain, itchiness, etc., for the wearer, and more preferably is a vanillyl alcohol alkyl ether derivative (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).

[0109] Examples of the cooling agents mentioned above include those that activate TRP channels, such as agonists for the TRPM8 receptor and agonists for the TRPA1 receptor, with agonists for the TRPM8 receptor being preferred.

[0110] Examples of the cooling agents mentioned above 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, and essential oils derived from plants (e.g., mint, eucalyptus).

[0111] Other ingredients mentioned above include, for example, pH adjusters, humectants, pigments, dyes, and plant extracts. Examples of pH adjusting agents include those that maintain the skin at a slightly acidic pH, such as malic acid, succinic acid, citric acid, tartaric acid, and lactic acid. Examples of the above-mentioned pigments include titanium dioxide.

[0112] The other components mentioned above may be lipophilic or hydrophilic. If the other components are hydrophilic, they are more likely to coexist with polyhydric alcohols. As a result, when a liquid reaches the permeable sheet, the hydrophilic components, along with the polyhydric alcohols, become more easily soluble in the liquid, allowing them to exert their effects in the liquid, for example.

[0113] Because the other components mentioned above are lipophilic, these lipophilic components tend to coexist with the oily components. As a result, before the liquid reaches the permeable sheet, the lipophilic components are less likely to exert their effects. However, once the liquid reaches the permeable sheet, the lipophilic components are released together with the emulsion of the oily components, making it easier for the other components to exert their effects. For example, if the warming agent and the cooling agent are lipophilic, the warming agent or the cooling agent can impart their effect to the wearer each time the gel composition comes into contact with a liquid.

[0114] [Absorbent articles] The liquid to be absorbed by the absorbent articles of this disclosure is not particularly limited as long as it is in liquid form, and includes, for example, body fluids such as blood, menstrual blood, urine, saliva, sweat, semen, lymph, tissue fluid, body cavity fluid, tears, nasal mucus, breast milk, etc. Absorbent articles of this disclosure include those that absorb the above-mentioned liquids, such as sanitary napkins, panty liners, disposable diapers, incontinence pads, disposable underwear, breast pads, pet sheets, etc.

[0115] In the above absorbent article, the liquid-permeable sheet contains a gel-like composition, preferably 1 to 30 g / m². 2 , more comfortably 2-20 g / m 2 , and more preferably 3-10 g / m 2 This is based on the basis weight of the gel-like composition and the absorbency of the absorbent article.

[0116] The above-mentioned gel-like composition can be placed at any position on the liquid-permeable sheet in the thickness direction of the absorbent article, but it can be placed on the skin-contacting surface of the liquid-permeable sheet, inside the liquid-permeable sheet, or on the non-skin-contacting surface of the liquid-permeable sheet. From the viewpoint of the gel-like composition exerting its effect, it is preferable to place it on the skin-contacting surface of the liquid-permeable sheet.

[0117] The above-mentioned gel-like composition is placed in any region of the liquid-permeable sheet in the planar direction of the absorbent article, but from the viewpoint of the gel-like composition exerting its effect, it is preferable to place it in a region of the liquid-permeable sheet that is in direct contact with bodily fluids, for example, in the area of ​​the liquid-permeable sheet that is in contact with the excretory opening.

[0118] The above gel-like composition is coated using a known coater in any form, such as lines, dots, or particulate matter (e.g., fine particles). Figure 1 is a plan view showing a sanitary napkin 1 according to one embodiment (first embodiment) of the present disclosure. The sanitary napkin 1 shown in Figure 1 has a liquid-permeable sheet 2, a liquid-impermeable sheet (not shown), and an absorbent 3 disposed between the liquid-permeable sheet 2 and the liquid-impermeable sheet (not shown). The sanitary napkin 1 shown in Figure 1 also has a side sheet 4 and an embossed portion 5.

[0119] The liquid-permeable sheet 2 contains a plurality of line-shaped gel-like compositions 6 on its skin-contacting surface, and the plurality of line-shaped gel-like compositions 6 are arranged on the skin-contacting surface of the liquid-permeable sheet 2 along the longitudinal direction L of the sanitary napkin 1 and spaced apart in the width direction W of the sanitary napkin 1.

[0120] Figure 2 is a plan view showing a sanitary napkin 1 according to another embodiment (second embodiment) of the present disclosure. In the sanitary napkin 1 shown in Figure 2, the liquid-permeable sheet 2 contains a gel-like composition 6 on its skin-contacting surface, and a plurality of dot-shaped gel-like compositions 6 are arranged in a staggered pattern on the skin-contacting surface of the liquid-permeable sheet 2.

[0121] The above-mentioned liquid-permeable sheet can be a fabric (e.g., nonwoven fabric, woven fabric, and knitted fabric), a perforated film, etc. 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. This makes it easier for the oily component emulsion to be arranged on the surface of the fibers constituting the fabric, and the oily component emulsion makes it easier for the liquid to slide onto the absorbent. This effect is enhanced when the average particle size of the oily component emulsion is within the above range.

[0122] Furthermore, the average fiber diameter of the fibers constituting the fabric is preferably larger than that of the oily component emulsion, more preferably twice as large, even more preferably three times as large, even more preferably five times as large, and even more preferably seven times as large. This makes it easier for the oily component emulsion to be arranged on the surface of the fibers.

[0123] In this specification, the average fiber diameter of the fibers is measured as follows: Cut out 10 samples, each measuring 5mm x 5mm, from any point on the liquid-permeable sheet. Using a scanning electron microscope (KEYENCE VE-7800), a total of 10 photographs (one per sample) of the sample surface are taken at a magnification of 500x. • Measure the fiber diameter of a predetermined number of fibers (for example, 10 fibers) in each of the 10 photographs. The average fiber diameter is calculated by dividing the sum of the predetermined number of fiber diameters in a total of 10 photographs by the predetermined number of fiber diameters in a total of 10 photographs. [Examples]

[0124] The following examples illustrate this disclosure, but this disclosure is not limited to these examples. [Manufacturing Example 1] 88.4 parts of Panaset 810S (manufactured by NOF Corporation), 10.9 parts of glycerin, and 0.7 parts of Kaneka Surfactin (manufactured by Kaneka Corporation) were mixed at room temperature to form gel-like composition No. 1. Furthermore, Panasete 810S contains C8 fatty acid: C 10 It is a triester (triglyceride) of glycerol and fatty acids, containing fatty acids in a weight ratio of approximately 85:15.

[0125] As shown in Figure 1, gel composition No. 1 was applied in multiple lines to the skin-contacting surface of a liquid-permeable sheet of a commercially available sanitary napkin (Sofy Bodyfit, manufactured by Unicharm Corporation, hereinafter referred to as "commercial napkin") to obtain sanitary napkin No. 1. The width of the coated and uncoated sections of the line-shaped gel composition No. 1 was 2 mm each, and the basis weight (average basis weight including coated and uncoated sections) was 4.0 g / m². 2 That was the case.

[0126] [Comparative Manufacturing Example 2] 95 parts of Panasete 810S (manufactured by NOF Corporation) as an oily component and 5 parts of Leopal KL2 (manufactured by Chiba Flour Milling Co., Ltd., dextrin palmitate) were mixed at 80°C to form gel-like composition No. 2. Gel-like composition No. 2 was coated onto a commercially available sanitary napkin in the same line pattern and with the same basis weight as in Production Example 1 to obtain sanitary napkin No. 2.

[0127] [Comparative Manufacturing Example 3] 85 parts of Panasete 810S (manufactured by NOF Corporation) as an oily component and 15 parts of Leopal TT2 (manufactured by Chiba Flour Milling Co., Ltd., (palmitic acid / ethylhexanoic acid) dextrin) were mixed at 80°C to form gel-like composition No. 3. Gel-like composition No. 3 was coated onto a commercially available sanitary napkin in the same line pattern and with the same basis weight as in Production Example 1 to obtain sanitary napkin No. 3.

[0128] [Comparative Manufacturing Example 4] Panaset 810S was coated onto a commercially available sanitary napkin in the same linear pattern and with the same basis weight as in Manufacturing Example 1 to obtain sanitary napkin No. 4. [Comparative Manufacturing Example 5] Commercially available sanitary napkins were designated as sanitary napkin No. 5.

[0129] [Example 1 and Comparative Examples 2-5] The absorption rate and rewetting rate of sanitary napkins No. 1 to No. 5 were evaluated both initially (immediately after manufacturing) and after a period of time (after being stored at 50°C for 4 weeks). The results are shown in Table 1. The methods for evaluating absorption rate and rewetting rate are as follows.

[0130] [Rewetting rate and absorption rate] A perforated acrylic plate (200mm x 100mm, 125g, with a 40mm x 10mm hole in the center) is placed on top of the liquid-permeable sheet of a sanitary napkin. 3g of horse fibrous blood (manufactured by Japan Lamb Co., Ltd.) at 37±1℃ is pipetted through the hole (1st time), and after 1 minute, another 3g of horse fibrous blood at 37±1℃ is pipetted through the hole in the acrylic plate (2nd time).

[0131] Immediately after the second application of horse fibrous blood, remove the acrylic plate, place 10 sheets of filter paper (50mm x 35mm) on the spot where the horse fibrous blood was applied, and apply a pressure of 30g / cm² from above. 2 Place the weight so that the following occurs. After 1 minute, remove the filter paper and calculate the "rewetting rate" according to the following formula. Rewetting rate (%) = 100 × (Mass of filter paper after testing - Mass of filter paper at the beginning) / 6

[0132] In addition to evaluating the rewetting rate, the "absorption rate (1st time)" is measured, which is the time it takes for the horse fibrous blood to transfer from the permeable sheet to the absorbent material after the first application of horse fibrous blood. The "absorption rate (2nd time)" is measured, which is the time it takes for the horse fibrous blood to transfer from the permeable sheet to the absorbent material after the second application of horse fibrous blood. The above absorption rate refers to the time it takes for the redness of the blood to disappear from the surface and inside of the permeable sheet after the horse fibrous blood has been applied to the sanitary napkin.

[0133] [Table 1]

[0134] Sanitary napkin No. 1 absorbed quickly both initially and later, and also had minimal re-wetting. Sanitary napkins No. 2-4 repelled horse blood fibrous tissue after a period of time, and the blood remained on the permeable sheet. This is thought to be due to the oily components of the pads. In sanitary napkin No. 5, horse fibrous blood remained on the permeable sheet both initially and over time.

[0135] Furthermore, individually packaged sanitary napkins No. 1 and No. 4 were filled into packages and then packed into cardboard boxes. These cardboard boxes were sent back and forth between Tokyo and Kagawa multiple times using courier services. In sanitary napkin No. 1, the gel-like composition No. 1 remained largely unchanged and maintained its linear arrangement, but in sanitary napkin No. 4, some of the Panasete 810S had shifted.

[0136] [Example 2] Except for the following change in Panasete 810S (manufactured by NOF Corporation) as the oily component, a gel-like composition and sanitary napkins were formed in the same manner as in Manufacturing Example 1, and it was confirmed that they had the same effects as Gel Composition No. 1 and Sanitary Napkin No. 1. (i) H-408BRS ((a1) Ester of a chain-like hydrocarbon tetraol and at least one fatty acid, manufactured by NOF Corporation) (ii) Unistar H-208BRS ((a3) Ester of a chain-like hydrocarbon diol and at least one fatty acid, manufactured by NOF Corporation), (iii) Tributyl acetylcitrate ((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)

[0137] (iv) Tributyl citrate (((c2) Ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having three carboxyl groups with at least one aliphatic monohydric alcohol)) (v) Dioctyl adipate ((c3) Ester of a chain-like hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups with at least one aliphatic monohydric alcohol) (vi) Electol WE20 ((d3) fatty acid and aliphatic monohydric alcohol ester) (vii) Uniol PB500 ((e1) Polyoxy C3-C6 alkylene glycol) (viii) Pearl Ream 6 (A) [Explanation of symbols]

[0138] 1. Sanitary napkin 2. Liquid-permeable sheet 3 Absorbent 4 side seats 5 Embossed part 6. Gel-like composition

Claims

1. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent between them, The liquid-permeable sheet comprises a gel-like composition containing an oily component, a polyhydric alcohol, and a biosurfactant. The oily component has a kinematic viscosity of 0.01 to 80 mm² / s at 40°C, a water content of 0.01 to 4.0% by mass, and a weight-average molecular weight of less than 1,000. The absorbent article characterized by the above.

2. The absorbent article according to claim 1, wherein the gel-like composition is configured to form an emulsion of the oily component upon contact with water.

3. The absorbent article according to claim 2, wherein the emulsion has an average particle size of 0.5 to 5.0 μm.

4. The absorbent article according to claim 3, wherein the liquid-permeable sheet is made of a nonwoven fabric containing fibers having an average fiber diameter of 5 to 60 μm.

5. The absorbent article according to any one of claims 1 to 4, wherein the gel-like composition has a viscosity of 50 to 1,000 Pa·s at 36°C and a shear rate of 0.28 (1 / s).

6. The absorbent article according to any one of claims 1 to 5, wherein the gel-like composition contains the oily component, the polyhydric alcohol, and the biosurfactant in the following proportions based on their total mass: 60.0 to 94.9% by mass, 5.0 to 39.9% by mass, and 0.1 to 5.0% by mass.

7. The absorbent article according to any one of claims 1 to 6, wherein the biosurfactant is selected from the group consisting of surfactant, arslofactin, iturine, and salts thereof, and any combination thereof.

8. The absorbent article according to any one of claims 1 to 7, wherein the polyhydric alcohol is a trihydric or higher alcohol, or a polyether of a dihydric alcohol.

9. The oily component is (a 3 ester of a chain hydrocarbon tetrol and at least one fatty acid, (a 2 ester of a chain hydrocarbon triol and at least one fatty acid, (a 3 ester of a chain hydrocarbon diol and at least one fatty acid, (b 1 ether of a chain hydrocarbon tetrol and at least one aliphatic monohydric alcohol, (b 2 ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b 3 ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c 1 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 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 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 ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d 2 dialkyl ketone, (d 3 ester of a fatty acid and an aliphatic monohydric alcohol, (d 4 dialkyl carbonate, (e 1 polyoxy C 3 ~C 6 alkylene glycol, (e 2 ester of polyoxy C 3 ~C 6 alkylene glycol and at least one fatty acid, (e 3 ether of polyoxy C 3 ~C 6 alkylene glycol and at least one aliphatic monohydric alcohol, and (f 1 An absorbent article according to any one of claims 1 to 8, selected from the group consisting of chain alkanes and any combination thereof.

10. The absorbent article according to any one of claims 1 to 9, wherein the gel-like composition further comprises a drug.

11. The absorbent article according to any one of claims 1 to 10, wherein the oily component further comprises a warming agent and / or a cooling agent.

12. The absorbent article according to any one of claims 1 to 11, wherein the gel-like composition is disposed in a region of the liquid-permeable sheet that is in direct contact with bodily fluids.

13. The absorbent article according to any one of claims 1 to 12, wherein the gel-like composition is arranged in the form of lines, dots, or particles on the skin-contacting surface of the liquid-permeable sheet.

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