Water permeability agents and their uses

Abstract

To provide a water-permeability imparting agent which imparts excellent water permeability to fibers and has excellent stability. A water-permeability-imparting agent comprising an anionic surfactant (P) containing a P element and at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)) and a nonionic surfactant (N), wherein the acid value of the nonvolatile content of the water-permeability-imparting agent is 0.5 to 150 KOH mg / g, and the activator (P) essentially comprises a compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), and optionally comprises a compound (C) represented by the following general formula (3):

Description

[Technical Field]

[0001] The present invention relates to a water permeability agent and its use. [Background technology]

[0002] Generally, absorbent articles such as disposable diapers and synthetic napkins, which are typified by sanitary napkins, have a three-layer structure: a top sheet made of a nonwoven fabric of any type, primarily made of hydrophobic synthetic fibers (such as polyolefin fibers or polyester fibers), which has been given hydrophilic properties; a back sheet made of a water-repellent material; and an absorbent core sandwiched between the top sheet and back sheet, which is made of cotton-like pulp or a polymeric absorbent material. Liquids such as urine and body fluids pass through the top sheet and are absorbed into the absorbent body, but the top sheet must have good water permeability, i.e., instantaneous water permeability so that the time it takes for liquid to be completely absorbed from the top sheet into the internal absorbent body is extremely short.

[0003] Furthermore, if the treatment agent on the top sheet is washed away after only one or two liquid absorptions, causing a sudden drop in water permeability, which is undesirable as it increases the number of diaper changes, the top sheet must have durable water permeability to withstand repeated liquid absorption. Additionally, it must be able to prevent liquid once absorbed by the absorbent from returning to the top sheet, i.e., it must be able to prevent liquid from returning. From the perspective of nonwoven fabric manufacturing, good carding properties are required to prevent winding around the cylinder and the generation of scum, which can prevent the production of nonwoven fabrics with excellent surface quality. For hydrophobic synthetic fibers with extremely poor hydrophilicity, there is a need for water permeability agents and water-permeable fibers with these agents attached that meet the above requirements. Therefore, investigations have been conducted into agents that satisfy the above-mentioned performance requirements. For example, Patent Document 1 proposes a treatment agent containing a polyoxyalkylene derivative of a polyvalent active hydrogen compound, which is an alkylene oxide adduct of a polyvalent active hydrogen compound, and a linear hydrocarbon compound. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2019-189990 Summary of the Invention [Problem to be solved by the invention]

[0005] However, these treatment agents still lack the water permeability required for nonwoven fabrics currently used as sanitary materials, and also have the problem of lacking stability. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water-permeability imparting agent that imparts excellent water permeability to fibers and has excellent stability, and also to provide fibers and nonwoven fabrics to which the water-permeability imparting agent is attached. [Means for solving the problem]

[0006] As a result of intensive research into solving the above-mentioned problems, the present inventors have found that the problems can be solved by a water permeability agent that contains an anionic surfactant (P) containing a P element represented by a specific chemical formula, at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)), and a nonionic surfactant (N), and that has an acid value within a specific range. That is, the water permeability imparting agent of the present invention is a water permeability imparting agent containing an anionic surfactant (P) containing a P element, and at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)) and a nonionic surfactant (N), the acid value of the nonvolatile content of the water-permeability imparting agent is 0.5 to 150 KOH mg / g; The activator (P) essentially contains a compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), and optionally contains a compound (C) represented by the following general formula (3): fruit , The nonionic surfactant (N) has an HLB of 7 to 11, and the surfactant (S) contains a polyhydric alcohol fatty acid ester sulfate salt (S-2).

[0007] [ka]

[0008] (In the formula, R 1 is a hydrocarbon group having 16 to 22 carbon atoms. 1 may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M 1 is a hydrogen atom, an alkali metal, or an organic amine salt. 2 is a hydrogen atom, an alkali metal, or an organic amine salt.

[0009] [ka]

[0010] (In the formula, R 2 and R 3 is a hydrocarbon group having 16 to 22 carbon atoms. 2 and R 3 may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M 1 is a hydrogen atom, an alkali metal, an ammonium, a phosphonium, an organic amine salt, or a quaternary ammonium salt. m If there are two, they may be the same or different.)

[0011] [ka]

[0012] (In the formula, R 4 is a hydrocarbon group having 16 to 22 carbon atoms. 4 may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M 1 and M 2 are each independently a hydrogen atom, an alkali metal, an ammonium, a phosphonium, an organic amine salt, or a quaternary ammonium salt. 2 or R 5 (OA) m R5 is a hydrocarbon group having 16 to 22 carbon atoms. 5 may be a straight chain or a branched chain. Y is 1 or 2. 2 Or (AO) m If there are two or more, they may be the same or different.)

[0013] The proportion of anionic surfactants in the total of anionic surfactants and nonionic surfactants [anionic / (anionic+nonionic)] is preferably 50 to 100% by weight. It is preferable that the water permeability imparting agent contains the surfactant (S), and that the surfactant (S) contains a dialkylsulfosuccinic acid and / or a salt thereof (S-1). It is preferable that the water permeability imparting agent contains the nonionic surfactant (N), and that the HLB of the nonionic surfactant (N) is 7-11. It is preferable that the water permeability imparting agent contains the surfactant (S), and that the surfactant (S) contains a polyhydric alcohol fatty acid ester sulfate salt (S-2). The water-permeability imparting agent is preferably a menstrual blood permeable agent. The concentration of the nonvolatile content of the water permeability imparting agent is preferably 50 to 100% by weight.

[0014] The fiber of the present invention is obtained by adding the water-permeability-imparting agent to raw fiber. The nonwoven fabric of the present invention is provided with the water-permeability-imparting agent. The absorbent article of the present invention is made using the nonwoven fabric. [Effects of the Invention]

[0015] The water-permeability imparting agent of the present invention has excellent stability and can impart excellent water permeability to fibers. The fiber of the present invention and the nonwoven fabric of the present invention have excellent water permeability. DETAILED DESCRIPTION OF THE INVENTION

[0016] The water permeability imparting agent of the present invention comprises an anionic surfactant (P) containing a P element, and at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)) and a nonionic surfactant (N), and the activator (P) has an acid value within a specific range and a specific structure. Each component is described in detail below.

[0017] [Anionic surfactant (P)] The anionic surfactant (P) is an anionic surfactant containing a P element. The anionic surfactant (P) essentially contains a compound (A) represented by the above general formula (1) and a compound (B) represented by the above general formula (2).

[0018] (Compound (A)) The compound (A) is a compound represented by the above general formula (1). The compound (A) has the function of improving water permeability when used in combination with the surfactant (S) and / or the nonionic surfactant (N) described below. In general formula (1), R 1 is a hydrocarbon group having 16 to 22 carbon atoms. Those having less than 16 carbon atoms lack stability, and those having more than 22 carbon atoms lack water permeability. From the viewpoint of exerting the effects of the present invention, R 1 is preferably a hydrocarbon group having 18 to 22 carbon atoms, and most preferably 18 carbon atoms. R 1 The may be a straight chain or a branched chain, but is preferably a straight chain from the viewpoint of exerting the effects of the present invention. AO is an oxyalkylene group having 2 to 4 carbon atoms, and from the viewpoint of exerting the effects of the present invention, AO preferably has 2 carbon atoms. m is an integer of 0 to 15, and is preferably an integer of 0 to 10, more preferably 0 to 8, from the viewpoint of exerting the effects of the present invention.

[0019] M 1 is a hydrogen atom, an alkali metal, or an organic amine salt. 2 is a hydrogen atom, an alkali metal, or an organic amine salt.

[0020] (Compound (B)) The compound (B) is a compound represented by the above general formula (2). When used in combination with the surfactant (S) or nonionic surfactant (N) described below, the compound (B) exhibits the performance of simultaneously satisfying the requirements for water permeability and stability. In general formula (2), R 2 and R 3 is a hydrocarbon group having 16 to 22 carbon atoms. Those having less than 16 carbon atoms lack stability, and those having more than 22 carbon atoms lack water permeability. From the viewpoint of exerting the effects of the present invention, R 2 and R 3 is preferably a hydrocarbon group having 18 to 22 carbon atoms, and most preferably 18 carbon atoms. R 2 and R 3 The may be a straight chain or a branched chain, but is preferably a straight chain from the viewpoint of exerting the effects of the present invention. AO is an oxyalkylene group having 2 to 4 carbon atoms, and from the viewpoint of exerting the effects of the present invention, AO preferably has 2 carbon atoms. m is an integer of 0 to 15, and is preferably an integer of 0 to 10, more preferably 0 to 8, from the viewpoint of exerting the effects of the present invention.

[0021] M 1 is a hydrogen atom, an alkali metal, ammonium, phosphonium, an organic amine salt, or a quaternary ammonium salt. In the molecule (AO) m If there are two, they may be the same or different.

[0022] (Compound (C)) Compound (C) is a compound represented by the following general formula (3), and is an optional component included in the present invention. The present invention is preferred because containing compound (C) provides excellent water permeability, stability, and wet-back properties. In general formula (3), R 4 is a hydrocarbon group having 16 to 22 carbon atoms. 4 is preferably a hydrocarbon group having 18 to 22 carbon atoms, and most preferably 18 carbon atoms. R 4The may be a straight chain or a branched chain, but is preferably a straight chain from the viewpoint of exerting the effects of the present invention. m is an integer of 0 to 15, and is preferably an integer of 0 to 10, more preferably 0 to 8, from the viewpoint of exerting the effects of the present invention. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. 1 and M 2 are each independently a hydrogen atom, an alkali metal, an ammonium, a phosphonium, an organic amine salt, or a quaternary ammonium salt. 2 or R 5 (OA) m R 5 is a hydrocarbon group having 16 to 22 carbon atoms. 5 may be a straight chain or a branched chain. Y is 1 or 2. M in the molecule 2 Or (AO) m When there are two or more, they may be the same or different.

[0023] (Compound (D)) The compound (D) is a compound represented by the following general formula (4), and it is preferable that the present invention contains the compound (D) in order to achieve the effects of the present invention.

[0024] [ka] In the formula, R 6 , R 7 and R 8 are each independently a hydrocarbon group having 16 to 22 carbon atoms, and in order to exert the effects of the present application, the upper limit of the number of carbon atoms is preferably 20, more preferably 19, and even more preferably 18, and the lower limit of the number of carbon atoms is preferably 17, and more preferably 18. R 6 , R 7 and R 8 may be the same or different.

[0025] AO is an oxyalkylene group having 2 to 4 carbon atoms. m, which is the number of repetitions of the oxyalkylene unit, is an integer of 0 to 20. From the viewpoint of exerting the effects of the present invention, the upper limit of the number of repetitions m is preferably 20, more preferably 18, and even more preferably 16, and the lower limit of the number of repetitions m is preferably 3, more preferably 5, and even more preferably 7. Furthermore, from the viewpoint of exerting the effects of the present invention, the upper limit of the number of repetitions m is preferably 9, more preferably 8, and even more preferably 7, and the lower limit of the number of repetitions m is preferably 0, more preferably 1, and even more preferably 2. For example, from the viewpoint of exerting the effects of the present invention, 3 to 20 is preferable, and 0 to 9 is more preferable from the viewpoint of instantaneous water permeability and repeated water permeability. In the molecule (AO) m When there are two or more, they may be the same or different.

[0026] [Inorganic phosphate (salt) (IN)] In order to exert the effects of the present invention, the water permeability imparting agent of the present invention preferably contains inorganic phosphoric acid (salt) (IN). The inorganic phosphate (salt) (IN) is at least one selected from phosphoric acid, metal dihydrogen phosphate, dimetal hydrogen phosphate, and trimetal phosphate. Specific examples of the monometal dihydrogen phosphate include monopotassium dihydrogen phosphate and monosodium dihydrogen phosphate, examples of the dimetal hydrogen phosphate include dipotassium hydrogen phosphate and disodium hydrogen phosphate, and examples of the trimetal phosphate include tripotassium phosphate and trisodium phosphate.

[0027] [Anionic surfactant (S)] The anionic surfactant (S) is an anionic surfactant containing an S element, excluding the surfactant (P). The anionic surfactant (S) exhibits excellent water permeability and stability when used in combination with the surfactant (P). The anionic surfactant (S) includes sulfonic acid type and sulfate type. Examples of sulfonic acid type include dialkylsulfosuccinic acid and / or its salt (S-1), alkylbenzenesulfonate, alkylsulfonate, alkanoylmethyl tauride, and the like. Examples of the sulfate type include polyhydric alcohol fatty acid ester sulfate salts (S-2), alkyl sulfate ester salts, polyoxyethylene alkyl sulfate ester salts, and the like.

[0028] Examples of the dialkyl sulfosuccinic acid and / or salt thereof (S-1) include sodium di-2-ethylhexyl sulfosuccinate, sodium ditridecyl sulfosuccinate, and the like.

[0029] Examples of the polyhydric alcohol fatty acid ester sulfate salts (S-2) include rapeseed oil sulfate sodium salt, rapeseed oil sulfate potassium salt, castor oil sulfate sodium salt, and castor oil sulfate potassium salt.

[0030] [Nonionic surfactant (N)] The nonionic surfactant (N) is a component that provides excellent water permeability and stability when used in combination with the surfactant (P). The nonionic surfactant (N) is at least one selected from polyoxyalkylene polyhydric alcohol ethers (N1), polyoxyalkylene polyhydric alcohol fatty acid esters (N2), polyoxyalkylene aliphatic alcohol ethers (N3), fatty acid esters of polyalkylene glycols (N4), and polyhydric alcohol fatty acid esters (N5). From the viewpoint of exerting the effects of the present invention, it is preferable to use at least one selected from polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol esters (N6) (hereinafter sometimes referred to as polyhydroxy esters) and esters (N7) in which at least one hydroxyl group of a polyhydroxy ester is blocked with a fatty acid.

[0031] (Polyoxyalkylene polyhydric alcohol ether) (N1) The polyoxyalkylene polyhydric alcohol ether is a compound having a structure in which an alkylene oxide such as ethylene oxide, propylene oxide, or butylene oxide is added to a polyhydric alcohol. Examples of polyhydric alcohols include ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, diglycerin, sorbitan, sorbitol, ditrimethylolpropane, dipentaerythritol, sucrose, etc. Among these, glycerin, trimethylolpropane, and sucrose are preferred.

[0032] The number of moles of alkylene oxide added is preferably 3 to 100, more preferably 4 to 70, and even more preferably 5 to 50. The proportion of ethylene oxide in the alkylene oxide is preferably 50 mol % or more, and even more preferably 80 mol % or more. The weight average molecular weight of the polyoxyalkylene polyhydric alcohol ether is preferably 300 to 10,000, more preferably 400 to 8,000, and even more preferably 500 to 5,000.

[0033] Examples of polyoxyalkylene polyhydric alcohol ethers include, but are not limited to, polyethylene glycol, glycerin ethylene oxide adducts, trimethylolpropane ethylene oxide adducts, pentaerythritol ethylene oxide adducts, diglycerin ethylene oxide adducts, sorbitan ethylene oxide adducts, sorbitan ethylene oxide propylene oxide adducts, sorbitol ethylene oxide adducts, sorbitol ethylene oxide propylene oxide adducts, ditrimethylolpropane ethylene oxide adducts, dipentaerythritol ethylene oxide adducts, and sucrose ethylene oxide adducts.

[0034] (Polyoxyalkylene polyhydric alcohol fatty acid ester) (N2) Polyoxyalkylene polyhydric alcohol fatty acid esters are compounds having a structure in which a compound in which an alkylene oxide such as ethylene oxide, propylene oxide, or butylene oxide is added to a polyhydric alcohol is ester-bonded to a fatty acid. Examples of polyhydric alcohols include glycerin, trimethylolpropane, pentaerythritol, erythritol, diglycerin, sorbitan, sorbitol, ditrimethylolpropane, dipentaerythritol, sucrose, etc. Among these, glycerin, diglycerin, sorbitan, and sorbitol are preferred.

[0035] Examples of fatty acids include lauric acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, isocetyl acid, stearic acid, isostearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, arachidic acid, eicosenoic acid, behenic acid, isodocosanoic acid, erucic acid, lignoceric acid, and isotetracosanoic acid.

[0036] The number of moles of alkylene oxide added is preferably 3 to 100, more preferably 5 to 70, and even more preferably 10 to 50. The proportion of ethylene oxide in the alkylene oxide is preferably 50 mol % or more, and even more preferably 80 mol % or more. The weight average molecular weight of the polyoxyalkylene polyhydric alcohol fatty acid ester is preferably 300 to 7,000, more preferably 500 to 5,000, and even more preferably 700 to 3,000.

[0037] Examples of polyoxyalkylene polyhydric alcohol fatty acid esters include glycerin ethylene oxide adduct monolaurate, glycerin ethylene oxide adduct dilaurate, glycerin ethylene oxide adduct trilaurate, trimethylolpropane ethylene oxide adduct trilaurate, sorbitan ethylene oxide adduct monooleate, sorbitan ethylene oxide adduct dioleate, sorbitan ethylene oxide adduct trioleate, sorbitan ethylene oxide propylene oxide adduct monooleate, sorbitan ethylene oxide propylene oxide adduct dioleate, sorbitan ethylene oxide propylene oxide adduct trioleate, sorbitan ethylene oxide propylene oxide adduct trilaurate, and sucrose ethylene oxide adduct trilaurate, but are not limited thereto.

[0038] (Polyoxyalkylene fatty alcohol ether) (N3) The polyoxyalkylene aliphatic alcohol ether is a compound having a structure in which an alkylene oxide such as ethylene oxide, propylene oxide, or butylene oxide is added to an aliphatic monohydric alcohol. Examples of polyoxyalkylene aliphatic alcohol ethers include alkylene oxide adducts of aliphatic alcohols such as octyl alcohol, 2-ethylhexyl alcohol, decyl alcohol, lauryl alcohol, tridecyl alcohol, myristyl alcohol, stearyl alcohol, isostearyl alcohol, and oleyl alcohol. The number of moles of alkylene oxide added is preferably 1 to 100 moles, more preferably 2 to 70 moles, and even more preferably 3 to 50 moles. The ratio of ethylene oxide to the total alkylene oxide is preferably 20 mole % or more, more preferably 30 mole % or more, and even more preferably 40 mole % or more.

[0039] (Fatty acid ester of polyalkylene glycol) (N4) The fatty acid ester of polyalkylene glycol is a compound having a structure in which polyoxyethylene glycol, polyoxyethylene polyoxypropylene glycol, and a fatty acid are ester-bonded. The weight-average molecular weight of the polyalkylene glycol is preferably 100 to 1,000, more preferably 150 to 800, and even more preferably 200 to 700.

[0040] Examples of polyalkylene glycol fatty acid esters include, but are not limited to, polyethylene glycol monolaurate, polyethylene glycol dilaurate, polyethylene glycol monooleate, polyethylene glycol dioleate, polyethylene glycol monostearate, polyethylene glycol distearate, polyethylene polypropylene glycol monolaurate, polyethylene polypropylene glycol dilaurate, polyethylene polypropylene glycol monooleate, and polyethylene polypropylene glycol dioleate.

[0041] (Polyhydric alcohol fatty acid ester) (N5) Polyhydric alcohol fatty acid esters are compounds having a structure in which a polyhydric alcohol and a fatty acid are ester-bonded. Examples of polyhydric alcohols include ethylene glycol, trimethylolpropane, pentaerythritol, erythritol, diethylene glycol, diglycerin, sorbitan, sorbitol, ditrimethylolpropane, sucrose, etc. Among these, ethylene glycol, glycerin, diglycerin, sorbitan, and sorbitol are preferred.

[0042] Examples of fatty acids include lauric acid, myristic acid, myristoleic acid, palmitic acid, palmitoleic acid, isocetylic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, isoiicosanoic acid, gadoleic acid, eicosenoic acid, behenic acid, isodocosanoic acid, erucic acid, and lignoceric acid.

[0043] The polyhydric alcohol fatty acid ester has at least one or two or more hydroxyl groups. The weight average molecular weight of the polyhydric alcohol fatty acid ester is preferably 100-1,000, more preferably 200-800, and even more preferably 300-600.

[0044] Examples of fatty acid esters include, but are not limited to, glycerin monolaurate, glycerin dilaurate, glycerin monooleate, glycerin dioleate, sorbitan monooleate, sorbitan dioleate, sucrose monolaurate, and sucrose dilaurate.

[0045] From the viewpoint of improving heat resistance, it is preferable to use a nonionic surfactant (N) that has been purified by removing catalysts and the like.

[0046] (Polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester) (sometimes called polyhydroxy ester) (N6) Compounds which are esters of condensation products of polyhydroxy esters and dicarboxylic acids, with at least one hydroxyl group blocked with a fatty acid (N7) Structurally, polyhydroxy esters are esters of polyoxyalkylene group-containing hydroxy fatty acids and polyhydric alcohols, and it is preferred that two or more of the hydroxy groups of the polyhydric alcohol are esterified. Therefore, polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol esters are esters having multiple hydroxy groups.

[0047] From the viewpoint of excellent water permeability and stability, the HLB value of the nonionic surfactant (N) is preferably 7 to 11, more preferably 8 to 10. The HLB value is an index showing the balance between hydrophilicity and lipophilicity, and is calculated from the ratio of the organic value to the inorganic value of an organic compound by the Oda method described on page 212 of "Introduction to Surfactants" (published by Sanyo Chemical Industries, Ltd. in 2007, written by Takehiko Fujimoto). HLB=10×Inorganic / Organic The organic and inorganic values ​​for deriving the HLB can be calculated using the values ​​in the table on page 213 of the aforementioned "Introduction to Surfactants."

[0048] [Water permeability imparting agent] The acid value (KOHmg / g) of the nonvolatile content of the water permeability imparting agent of the present invention is 0.5 to 150 KOHmg / g. If it is less than 0.5 KOHmg / g, the water permeability and stability are insufficient, and if it exceeds 150 KOHmg / g, the water permeability and stability are insufficient. The lower limit of the acid value of the nonvolatile content of the water permeability imparting agent of the present invention is preferably 1.0 KOHmg / g, more preferably 1.5 KOHmg / g, and even more preferably 2.0 KOHmg / g, from the viewpoints of water permeability and stability. The upper limit of the acid value of the nonvolatile content of the water permeability imparting agent of the present invention is preferably 100 KOHmg / g, more preferably 50 KOHmg / g, and even more preferably 30 KOHmg / g, from the viewpoints of water permeability and stability. In the present invention, the non-volatile content refers to the bone-dry components when the processing agent is heat-treated at 105°C to remove the solvent and the like, and reaches a constant weight.

[0049] The nonvolatile content of the water permeability imparting agent of the present invention is measured by P nuclear NMR. The ratio of P1 to the sum (P1+P2+P3) of the following peak areas P1 to P3 in the spectrum [P1 / (P1+P2+P3)] is preferably 40 to 100% from the viewpoints of water permeability and stability. P1: Peak area within the range of 0 to 10 ppm P2: Peak area within the range of -25 to -3 ppm P3: Peak area within the range of -3 to 0 ppm Compounds that exhibit peaks in the spectrum from -25 to 10 ppm tend to be mainly attributed to inorganic phosphoric acid or compound (A), compound (B), compound (D), and compound (C) in this order from the low magnetic field side. [P1 / (P1+P2+P3)] is preferably 40 to 100% because it provides excellent water permeability and stability. The upper limit of the ratio [P1 / (P1+P2+P3)] is preferably 90%, more preferably 80%, and even more preferably 75%, from the viewpoints of water permeability and stability. On the other hand, the lower limit of [P1 / (P1+P2+P3)] is preferably 40%, more preferably 45%, and even more preferably 50%, from the viewpoints of water permeability and stability. Also, for example, 40 to 90% is preferred, more preferably 45 to 85%, and even more preferably 50 to 75%. The peak areas of P1 to P3 are measured according to the method described in the Examples.

[0050] [A / (A+B+C+D+IN)] [A / (A+B+C+D+IN)] represents the ratio of the P NMR integral value (A) assigned to the compound (A) represented by the general formula (1) below to the sum (A+B+C+D+IN) of the P NMR integral value assigned to the compound (A) represented by the general formula (1) above, the P NMR integral value assigned to the compound (B) represented by the general formula (2) above, the P NMR integral value assigned to the compound (C) represented by the general formula (3) above, the P NMR integral value assigned to the compound (D) above, and the inorganic phosphate (IN) above (hereinafter referred to as the sum (A+B+C+D+IN) of the P NMR integral values). Compound (A) is 31 It can be detected by P-NMR method. Approximately 30 mg of the nonvolatile content of the measurement sample was weighed into a 5 mm diameter NMR sample tube, and approximately 0.5 ml of deuterated water (DO) or deuterated chloroform (CDCl) was added as a deuterated solvent to dissolve the sample. 31 Measurements were performed using P-NMR measurement devices (AVANCE400, 162 MHz, manufactured by BRUKER and JNM-ECZ400R, 162 MHz, manufactured by JEOL Ltd.). From the viewpoint of achieving the effects of the present invention, the lower limit of [A / (A+B+C+D+IN)] is preferably 20%, 22%, 25%, and 30%, in that order (the latter is more preferable, the same applies hereinafter). From the viewpoint of achieving the effects of the present invention, the upper limit of [A / (A+B+C+D+IN)] is preferably 98%, 95%, 92%, 90%, and 80%, in that order.

[0051] From the viewpoint of achieving the effects of the present invention, the lower limit of [B / (A+B+C+D+IN)] is preferably 1%, 3%, 5%, and 7%, in that order. From the viewpoint of achieving the effects of the present invention, the upper limit of [B / (A+B+C+D+IN)] is preferably 65%, 50%, 40%, and 30%, in that order.

[0052] [C / (A+B+C+D+IN)] represents the ratio of the P NMR integral value (C) assigned to the compound (C) to the total P NMR integral values ​​(A+B+C+D+IN). From the viewpoint of achieving the effects of the present invention, the lower limit of [C / (A+B+C+D+IN)] is preferably 0%, 4%, 8%, and 10%, in that order. From the viewpoint of achieving the effects of the present invention, the upper limit of [C / (A+B+C+D+IN)] is preferably 40%, 30%, and 20%, in that order.

[0053] [D / (A+B+C+D+IN)] represents the ratio of the P NMR integral value (D) assigned to the compound (D) to the total P NMR integral values ​​(A+B+C+D+IN). From the viewpoint of achieving the effects of the present invention, the lower limit of [D / (A+B+C+D+IN)] is preferably 0%, 4%, 8%, and 10%, in that order. From the viewpoint of achieving the effects of the present invention, the upper limit of [D / (A+B+C+D+IN)] is preferably 10%, 5%, 4%, and 2%, in that order.

[0054] [IN / (A+B+C+D+IN)] represents the ratio of the P NMR integral value (IN) attributed to the inorganic phosphate (IN) to the total P NMR integral value (A+B+C+D+IN). From the viewpoint of achieving the effects of the present invention, the lower limit of [IN / (A+B+C+D+IN)] is preferably 0%, 0.1%, 0.5%, and 1%, in that order. From the viewpoint of achieving the effects of the present invention, the upper limit of [IN / (A+B+C+D+IN)] is preferably 10%, 5%, 4%, 2% and 0%, in that order.

[0055] The weight ratio of the anionic surfactants to the total of the anionic surfactants and nonionic surfactants in the water permeability imparting agent [anionic / (anionic + nonionic)] is preferably 40 to 100% by weight from the viewpoint of achieving the effects of the present invention. The lower limit of the weight ratio of the anionic surfactants to the total of the anionic surfactants and nonionic surfactants in the water permeability imparting agent [anionic / (anionic + nonionic)] is preferably 50% by weight, more preferably 60% by weight, and even more preferably 65% ​​by weight. The upper limit is preferably 95% by weight, more preferably 85% by weight, and even more preferably 75% by weight.

[0056] The water-permeability imparting agent of the present invention is preferably for menstrual blood permeability, since it exerts a greater effect. The concentration of the nonvolatile content of the water permeability imparting agent is preferably 50 to 100% by weight, more preferably 55 to 95% by weight, and even more preferably 60 to 90% by weight, from the viewpoint of achieving better stability.

[0057] From the viewpoint of achieving superior stability, the water permeability imparting agent of the present invention preferably has a silicone compound content relative to the non-volatile content of the water permeability imparting agent of less than 50% by weight, more preferably 30% by weight or less, even more preferably 5% by weight or less, particularly preferably 3% by weight or less, and most preferably less than 1% by weight.

[0058] 〔fiber〕 The fiber of the present invention is obtained by adding the water-permeability-imparting agent to raw fiber. The fiber of the present invention may be short fiber or long fiber, and short fiber is preferable in terms of water permeability. The adhesion rate of the nonvolatile content of the water permeability imparting agent to the fiber body (raw fiber) is preferably 0.03 to 2% by weight, more preferably 0.1 to 1% by weight, based on the fiber body in terms of antistatic property and water permeability.

[0059] Examples of the fiber body include polyolefin fibers, polyester fibers, nylon fibers, vinyl chloride fibers, and composite fibers made of two or more thermoplastic resins. Examples of composite fiber combinations include polyolefin resin / polyolefin resin, such as high-density polyethylene / polypropylene, linear high-density polyethylene / polypropylene, low-density polyethylene / polypropylene, a binary or terpolymer of propylene and another α-olefin / polypropylene, linear high-density polyethylene / high-density polyethylene, and low-density polyethylene / high-density polyethylene. Examples of polyolefin resin / polyester resin combinations include polypropylene / polyethylene terephthalate, high-density polyethylene / polyethylene terephthalate, linear high-density polyethylene / polyethylene terephthalate, and low-density polyethylene / polyethylene terephthalate. Examples of polyester resin / polyester resin combinations include copolymer polyester / polyethylene terephthalate. Other examples include fibers made of polyamide resin / polyester resin, polyolefin resin / polyamide resin, and the like. Among these fiber bodies, the water permeability imparting agent of the present invention is suitable for hydrophobic synthetic fibers such as polyolefin fibers (polyolefin fibers or composite fibers containing polyolefin fibers) and polyester fibers (polyester fibers or composite fibers containing polyester fibers) because of their preferred soft feel, and the water permeability imparting agent of the present invention is further suitable for polyolefin fibers. Furthermore, it is preferable that the fiber body is a fiber for manufacturing nonwoven fabric in terms of water permeability.

[0060] The cross-sectional structure of the fiber can be exemplified by sheath-core, parallel, eccentric sheath-core, multilayer, radial, or sea-island structures. However, from the viewpoint of productivity in the fiber manufacturing process and ease of nonwoven fabric processing, the sheath-core structure including eccentricity or the parallel structure is preferred. The cross-sectional shape can be circular or irregular. In the case of irregular shapes, any shape can be used, such as flat, polygonal (e.g., triangular to octagonal), T-shaped, hollow, or multi-lobed.

[0061] The water-permeability-imparting agent of the present invention may be applied to the fiber body directly without dilution, or may be applied to the fiber body after diluting with water or the like to a concentration such that the weight ratio of nonvolatile matter is 0.5 to 5% by weight. The process for applying the water-permeability-imparting agent to the fiber body may be any of the processes of spinning, drawing, and crimping the fiber body. The means for applying the water-permeability-imparting agent of the present invention to the fiber body are not particularly limited, and methods such as roller oiling, nozzle spray oiling, and dip oiling may be used. A method that can achieve the desired amount of adhesion more uniformly and efficiently may be adopted depending on the fiber production process and its characteristics. Furthermore, drying methods such as drying with hot air or infrared rays, or drying by contact with a heat source may be used.

[0062] [Nonwoven fabric] The nonwoven fabric of the present invention may be a raw nonwoven fabric to which a water-permeability-imparting agent has been added, or a nonwoven fabric made from fibers to which a water-permeability-imparting agent has been added. The method for producing the nonwoven fabric of the present invention is not particularly limited, and known methods can be used. Short fibers or long fibers can be used as the raw fibers. Examples of web formation methods using short fibers include dry methods such as carding and air-laid methods, and wet methods such as papermaking. Examples of web formation methods using long fibers include spunbonding, meltblowing, and flash spinning. Examples of interfiber bonding methods include chemical bonding, thermal bonding, needle punching, spunlace, and stitch bonding. The method for producing a nonwoven fabric of the present invention preferably includes the steps of passing the fibers of the present invention through a carding machine or the like to produce a fiber web and heat-treating the obtained fiber web. That is, the water-permeability imparting agent of the present invention is particularly suitable for use in nonwoven fabric production that includes a step of heat-treating a fiber web. Methods for bonding a fiber web by heat treatment include heat fusion methods such as thermocompression bonding using a heated roll or ultrasonic waves, heat fusion bonding using heated air, and point bonding. As an example of bonding a fiber web by heat treatment, in the case of a sheath-core type composite fiber in which a high-melting-point resin is used for the core and a low-melting-point resin is used for the sheath, heat treatment near the melting point of the low-melting-point resin can easily achieve thermal bonding at the fiber intersections. Examples of methods for producing nonwoven fabrics include a method in which staple fibers to which a water-permeability-imparting agent has been added are passed through a carding machine or the like to form a web, which is then heat-treated to bond and integrate as described above, and a method in which, when laminating pulp or the like in an airlaid method, the water-permeable fibers (staple fibers) of the present invention are mixed with the pulp and the like, and the resulting mixture is heat-treated and bonded as described above.Other methods include a method in which the water-permeability-imparting agent of the present invention is attached to a fiber molded product obtained by a spunbonding method, melt-blowing method, flash spinning method, or the like, and the resultant product is heat-treated with heated rolls or heated air, or the water-permeability-imparting agent of the present invention is attached to the molded product, to produce a nonwoven fabric.

[0063] In one example of the spunbonding method, a composite fiber resin is spun, and then the spun composite long fiber filaments are cooled with a cooling fluid and tensioned with drawing air to achieve the desired fineness. The spun filaments are then collected on a collection belt and bonded to obtain a spunbonded nonwoven fabric. Bonding methods include thermocompression bonding using a heated roll or ultrasonic waves, heat fusion bonding using heated air, and point bonding. The method for applying the water permeability imparting agent of the present invention to the obtained spunbonded nonwoven fabric can be a gravure method, a flexographic method, a roll coating method such as a gate roll method, a spray coating method, or the like, but is not particularly limited as long as the amount applied to the nonwoven fabric can be adjusted on each side. In addition, the drying method may be a method using hot air or infrared rays, or a method of drying by contact with a heat source, or the like.

[0064] [Absorbent articles] The absorbent article of the present invention includes the nonwoven fabric of the present invention. Examples of the absorbent article of the present invention include disposable diapers and sanitary napkins (e.g., sanitary napkins). In the absorbent article of the present invention, the nonwoven fabric of the present invention is preferably used as a top sheet of sanitary materials such as disposable diapers and sanitary napkins. It can also be used for second seats, absorbents, absorbent pads, etc. [Example]

[0065] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following examples, "percent (%)" and "parts" refer to "weight %" and "parts by weight" unless otherwise specified. In the examples and comparative examples, the properties of the water permeability agents were evaluated according to the following methods.

[0066] (Examples 1 to 46 and Comparative Examples 1 to 6) The components and water shown in Tables 1 to 7 were mixed to prepare the water-permeability imparting agents of Examples 1 to 46 and Comparative Examples 1 to 6, each having a nonvolatile content of 50% by weight based on the total weight of the water-permeability imparting agent. Each of the obtained water-permeability imparting agents was diluted with warm water at approximately 60°C to a concentration of 0.9% by weight of nonvolatile content to obtain a diluted solution. Next, 150 g of diluted solutions of each water-permeability agent were applied to 300 g of fiber bodies by the dip oiling method, resulting in a non-volatile content of the water-permeability agent attached to the water-permeable fiber of 0.45 wt%. The fiber bodies were polypropylene (core)-polyethylene (sheath) composite fibers with no fiber treatment agents such as water-permeability agents attached, and had a single fiber fineness of 2.2 Dtex and a fiber length of 38 mm. The fibers with the diluted solutions of each water-permeability agent attached were placed in a warm air dryer at 80°C for 2 hours, and then left to dry at room temperature for at least 8 hours to obtain water-permeable fibers. However, Examples 2, 4, 11, 19, 21, 23 and 31 are considered as Reference Examples 2, 4, 11, 19, 21, 23 and 31.

[0067] The components shown in Tables 1 to 7 are as follows: P-1 to P-8 and p1 to p-3 shown in Tables 1 to 7 are contained in the integral ratios shown in Table 8. A-1 General formula (1) compound, R 1 = n-stearyl group, m = 0, M 1 :H or K, M 2 :H or K A-2 General formula (1) compound, R 1 = n-cetearyl group, m = 0, M 1 :H or K, M 2 :H or K A-3 General formula (1) compound, R 1 = lauryl group, m = 0, M 1 :H or K, M 2 :H or K A-4 General formula (1) compound, R 1 = n-octyl group, m = 0, M 1 :H or K, M 2 :H or K A-5 General formula (1) compound, R 1 = n-hexyl group, m = 0, M 1 :H or K, M 2 :H or K B-1 General formula (2) compound, R 2 = n-stearyl group, R 3 = n-stearyl group, m = 0, M 1 :H or K B-2 General formula (2) compound, R 2 = n-cetearyl group, R 3 = n-cetearyl group, m = 0, M 1 :H or K B-3 General formula (2) compound, R 2 = lauryl group, R 3 = lauryl group, m = 0, M 1 :H or K B-4 General formula (2) compound, R 2 = n-octyl group, R 3 = n-octyl group, m = 0, M 1 :H or K B-5 General formula (2) compound, R 2 = n-hexyl group, R 3 = n-hexyl group, m = 0, M 1 :H or K C-1 General formula (3) compound, R 4 = n-stearyl group, m = 0, M 1:H or K, M 2 :H or K, Y=1, Q=M 2 C-2 General formula (3) compound, R 4 = n-cetearyl group, m = 0, M 1 :H or K, M 2 :H or K, Y=1, Q=M 2 C-3 General formula (3) compound, R 4 = lauryl group, m = 0, M 1 :H or K, M 2 :H or K, Y=1, Q=M 2 C-3 General formula (3) compound, R 4 = n-octyl group, m = 0, M 1 :H or K, M 2 :H or K, Y=1, Q=M 2 C-5 General formula (3) compound, R 4 = n-hexyl group, m = 0, M 1 :H or K, M 2 :H or K, Y=1, Q=M 2 D-1 Tristearyl Phosphate D-2 Tricetearyl Phosphate D-3 Trilauryl Phosphate D-4 Trioctyl Phosphate D-5 Trihexyl Phosphate S-1 Di-2-ethylhexyl sulfosuccinate sodium salt S-2 Ditridecylsulfosuccinic acid sodium salt S-3 Rapeseed oil sulfate sodium salt S-4 Castor oil sulfate sodium salt s-1 Polyoxyethylene 3 mol lauryl sulfate sodium salt s-2 Alkane (C12-15) sulfonate sodium salt N-1 Sorbitan Monooleate N-2 Polyoxyethylene 20 mol sorbitan trioleate N-3 alkyl (C12, 13)PO 2 moles EO 6 moles random adduct N-4 Glycerin PO 85.3 mol EO 21.8 mol block adduct N-5 Ester of polyoxyethylene (20 moles) castor wax condensate with maleic acid, blocked with 1 mole equivalent of stearic acid per mole equivalent of hydroxyl groups N-6 Polyester compound (weight average molecular weight 7000) of dimer acid of unsaturated fatty acid having 18 carbon atoms and polyoxyethylene glycol having a molecular weight of 600 n-1 Polyoxyethylene 25 moles hydrogenated castor oil ether n-2 sorbitan monolaurate n-3 Polyoxyethylene 20 mol sorbitan monooleate n-4 alkyl (C12, 14)PO 2 moles EO 10 moles random adduct n-5 PEG(400) oleate n-6 hexaglycerin monostearate n-7 Glycerin PO 90 moles EO 20 moles block adduct n-8 Trimethylolpropane PO6 7 moles EO1 1 mole block adduct n-9 Pentaerythritol PO104 mole adduct n-10 Pentaerythritol PO 10 4 mol EO 19.2 mol block adduct n-11 Sorbitol PO 9 mol BO 0.84 mol PO 78 mol block adduct n-12 coconut oil fatty acid diethanolamide

[0068] The obtained water-permeable fibers were subjected to a fiber opening process and a carding process using a carding tester, and the weight per unit area was 25 g / m 2 Webs of the above were produced. At that time, the physical properties (antistatic properties) of each water-permeable fiber were evaluated in the carding process using the evaluation method described below. The obtained web was heat-treated at 135°C in an air-through hot air circulation dryer to fix the web, and a nonwoven fabric was obtained. The water permeability of the obtained nonwoven fabric was evaluated using the evaluation method described below. The results are shown in Tables 1 to 7.

[0069] [Stability of treatment agent] Each treatment agent was adjusted to a non-volatile concentration of 50% by adding ion-exchanged water, and left to stand at 25°C for 3 months, after which the stability was evaluated according to the following criteria: ◎ is the best rating, and 〇 or better is suitable for practical use. 〔Judgment criteria〕 ◎ (Good): No precipitation or separation occurs, and the solution remains uniform as when it was prepared. 〇 (Acceptable): A small amount of precipitation or separation occurs, but the solution returns to a homogeneous state similar to that at the time of preparation by stirring at 100 rpm for approximately 10 minutes. △ (Not acceptable): Precipitation or separation occurs and the solution cannot be restored to a uniform state by stirring.

[0070] [Water permeability of nonwoven fabric] (Instant water permeability of nonwoven fabric) The nonwoven fabric is placed on top of filter paper (Toyo Roshi, No. 5), and one drop (approximately 0.05 ml) of artificial urine is dropped from a burette placed 10 mm above the surface of the nonwoven fabric. The time it takes for the drop to disappear from the surface of the nonwoven fabric is measured. This measurement is carried out at 20 points on the surface of the nonwoven fabric, and the number of drops that disappear within 5 seconds is displayed. The number is evaluated according to the following criteria. ◎ is the best rating, and 〇 or above is suitable for practical use. 〔Judgment criteria〕 ◎(Good)…18~20 pieces 〇(possible)…11~17 pieces △(Not possible)…1 to 10 pieces

[0071] (Durable water permeability of nonwoven fabric) According to the EDANA Repeated Liquid Strike-Through Time method, 0.9% saline was allowed to permeate a nonwoven fabric (10 cm x 10 cm) and the permeation time was measured. After permeation, the nonwoven fabric was sandwiched between two pieces of filter paper (Toyo Roshi, No. 5), and a board (10 cm x 10 cm) and a weight (500 g) were placed on top. The fabric was left to dehydrate for 3 minutes, and then air-dried for a further 5 minutes. The same procedure is repeated for the nonwoven fabric used in the test. In this repeated test, the shorter the water permeation time, the better. The time (number of seconds) after the fifth repeated test is judged according to the following criteria. ◎ is the best rating, and 〇 or better is suitable for practical use. 〔Judgment criteria〕 ◎ (Good)... Less than 3 seconds 〇 (OK)... 3 seconds or more but less than 10 seconds △(Not possible)…10 seconds or more

[0072] [Liquid return prevention property of nonwoven fabric] A nonwoven fabric (15 cm x 15 cm) was placed on top of the filter paper, and 14 mL of saline was dropped from a burette placed 30 mm above the surface of the nonwoven fabric. The nonwoven fabric was allowed to stand for 1 minute after the water droplets had been completely absorbed. A 4 kg load was then placed on top of the nonwoven fabric. After leaving it for 3 minutes, the load was removed, and a pre-weighed filter paper different from the aforementioned filter paper was placed on the surface of the nonwoven fabric, and a 4 kg load was again placed on top of it. After leaving it for 2 minutes, the load was removed, and the filter paper was weighed. The increase in weight was taken as the amount of liquid return (g). The amount of liquid return was used to evaluate the liquid return prevention properties according to the following criteria. ◎ is the best rating, and 〇 or above is suitable for practical use. ◎ (Good)... Less than 0.5g 〇(possible)…0.5g~1.5g △(Not allowed)…More than 1.5g

[0073] [Table 1]

[0074] [Table 2]

[0075] [Table 3]

[0076] [Table 4]

[0077] [Table 5]

[0078] [Table 6]

[0079] [Table 7]

[0080] [Table 8]

[0081] As can be seen from Tables 1 to 6, the water permeability imparting agents of Examples 1 to 46 are water permeability imparting agents containing an anionic surfactant (P) containing a P element, and at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)) and a nonionic surfactant (N), the acid value of the nonvolatile content of the water-permeability imparting agent is 0.5 to 150 KOH mg / g; The activator (P) essentially contains a compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), and optionally contains a compound (C) represented by the following general formula (3), thereby solving the problem of the present application. On the other hand, as can be seen from Table 7, when neither the anionic surfactant (S) nor the nonionic surfactant (N) was contained (Comparative Examples 1 to 3), or when the acid value of the nonvolatile matter was not 0.5 to 150 KOHmg / g (Comparative Examples 4 to 6), the objective of the present application, namely, either repeated water permeability or stability, was not achieved. [Industrial Applicability]

[0082] The fibers and nonwoven fabrics treated with the water-permeability imparting agent of the present invention are used in absorbent articles such as sanitary products, such as disposable diapers and napkins. They can also be used in food applications, medical applications, and industrial applications where absorbent sheets are required.

Claims

1. A water permeability imparting agent comprising an anionic surfactant (P) containing a P element, and at least one selected from an anionic surfactant (S) containing an S element (excluding the surfactant (P)) and a nonionic surfactant (N), the acid value of the nonvolatile content of the water-permeability imparting agent is 0.5 to 150 KOH mg / g; The activator (P) essentially contains a compound (A) represented by the following general formula (1) and a compound (B) represented by the following general formula (2), and optionally contains a compound (C) represented by the following general formula (3): The nonionic surfactant (N) has an HLB of 7 to 11, and the surfactant (S) contains a polyhydric alcohol fatty acid ester sulfate salt (S-2). Water permeability agent. 【Chemistry 1】 (In the formula, R １ is a hydrocarbon group having 16 to 22 carbon atoms. １ may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M １ is a hydrogen atom, an alkali metal, or an organic amine salt. ２ is a hydrogen atom, an alkali metal, or an organic amine salt. 【Chemistry 2】 (In the formula, R ２ and R ３ is a hydrocarbon group having 16 to 22 carbon atoms. ２ and R ３ may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M １ is a hydrogen atom, an alkali metal, an ammonium, a phosphonium, an organic amine salt, or a quaternary ammonium salt. ｍ If there are two, they may be the same or different.) 【Transformation 3】 (In the formula, R ４ is a hydrocarbon group having 16 to 22 carbon atoms. ４ may be a straight chain or a branched chain. AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is an integer of 0 to 15. M １ and M ２ are each independently a hydrogen atom, an alkali metal, ammonium, phosphonium, an organic amine salt, or a quaternary ammonium salt. ２ Or (OA) ｍ R ５ It is. ５ is a hydrocarbon group having 16 to 22 carbon atoms. ５ may be a straight chain or a branched chain. Y is 1 or 2. ２ Or (AO) ｍ If there are two or more, they may be the same or different.)

2. 2. The water permeability imparting agent according to claim 1, wherein the ratio of the anionic surfactant to the total of the anionic surfactant and the nonionic surfactant [anionic / (anionic+nonionic)] is 50 to 100% by weight.

3. The water-permeability imparting agent according to claim 1, wherein the water-permeability imparting agent comprises the surfactant (S), and the surfactant (S) comprises a dialkyl sulfosuccinic acid and / or a salt thereof (S-1).

4. 2. The water-permeability-imparting agent according to claim 1, wherein the water-permeability-imparting agent contains the nonionic surfactant (N), and the HLB of the nonionic surfactant (N) is 7 to 11.

5. The water-permeability-imparting agent according to claim 1, wherein the water-permeability-imparting agent comprises the surfactant (S), and the surfactant (S) comprises a polyhydric alcohol fatty acid ester sulfate salt (S-2).

6. The water-permeability imparting agent according to claim 1, which is for imparting menstrual blood permeability.

7. 2. The water-permeability imparting agent according to claim 1, wherein the concentration of nonvolatile matter in the water-permeability imparting agent is 50 to 100% by weight.

8. A fiber obtained by adding the water permeability imparting agent according to any one of claims 1 to 7 to raw fiber.

9. A nonwoven fabric to which the water permeability imparting agent according to any one of claims 1 to 7 has been imparted.

10. An absorbent article using the nonwoven fabric according to claim 9.

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