Water permeability-imparting agent and use thereof

Abstract

Provided is a water permeability-imparting agent which imparts excellent water permeability to fibers and exhibits excellent stability.　The water permeability-imparting agent contains: a P element-containing anionic surfactant (P); and at least one type of surfactant selected from among an S element-containing anionic surfactant (S) (excluding the surfactant (P)) and a non-ionic surfactant (N). The acid value of non-volatile components in the water permeability-imparting agent is 0.5-150 KOHmg / g. The surfactant (P) must include a compound (A) represented by general formula (1) and a compound (B) represented by general formula (2), and may optionally contain a compound (C) represented by general formula (3).

Description

Water permeability agents and their uses

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

[0002] Generally, absorbent articles such as sanitary napkins, represented by disposable diapers and synthetic napkins, have a three-layer structure consisting of a top sheet made of various nonwoven fabrics primarily made of hydrophobic synthetic fibers (polyolefin fibers, polyester fibers, etc.) that have been given hydrophilic properties, a back sheet made of water-repellent properties, and an absorbent body sandwiched between the two and made of cotton-like pulp, polymeric absorbent material, etc. 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, a sudden drop in water permeability due to the treatment agent on the top sheet absorbing only one or two liquids is undesirable because it increases the number of diaper changes, so the top sheet must have durable water permeability to withstand repeated liquid absorption. Additionally, it is necessary to prevent liquid once absorbed by the absorbent from returning to the top sheet, i.e., to prevent liquid return. From the perspective of nonwoven fabric production, good carding performance is required to prevent winding around the cylinder and scum formation, which can prevent the production of nonwoven fabrics with excellent surface quality. For hydrophobic synthetic fibers with extremely poor hydrophilicity, a water permeability agent and water-permeable fibers with the agent attached that meet the above requirements are required. Therefore, efforts have been made to develop agents that satisfy the above performance requirements. For example, Patent Document 1 proposes a treatment agent containing a polyoxyalkylene derivative of a polyvalent active hydrogen compound, an alkylene oxide adduct of a polyvalent active hydrogen compound, and a linear hydrocarbon compound.

[0004] Japanese Patent Application Publication No. 2019-189990

[0005] However, these treatment agents still lack the water permeability required for current nonwoven fabrics for sanitary materials, and also have the problem of lacking stability. The present invention was made in view of these circumstances, and its object is to provide a water permeability imparting agent that imparts excellent water permeability to fibers and has excellent stability. It is also an object of the present invention to provide fibers and nonwoven fabrics to which this water permeability imparting agent is attached.

[0006] As a result of intensive research to solve the above-mentioned problems, the present inventors have found that a water permeability imparting agent containing 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 having an acid value within a specific range, can solve the above-mentioned problems. 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, 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 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):

[0007]

[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]

[0010] (In the formula, R ２ and R ３ is a hydrocarbon group having 16 to 22 carbon atoms. ２ and R３ 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]

[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 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.)

[0013] The ratio of anionic surfactants to the total of anionic surfactants and nonionic surfactants [anionic / (anionic + nonionic)] is preferably 50 to 100% by weight. The water-permeability imparting agent preferably contains the surfactant (S), and the surfactant (S) contains a dialkyl sulfosuccinic acid and / or a salt thereof (S-1). The water-permeability imparting agent preferably contains the nonionic surfactant (N), and the HLB of the nonionic surfactant (N) is preferably 7 to 11. The water-permeability imparting agent preferably contains the surfactant (S), and the surfactant (S) contains a polyhydric alcohol fatty acid ester sulfate salt (S-2). The water-permeability imparting agent is preferably for menstrual blood permeability. The concentration of nonvolatile components 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 obtained by adding the water-permeability-imparting agent. The absorbent article of the present invention is made using the nonwoven fabric.

[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.

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

[0017] [Anionic surfactant (P)] The anionic surfactant (P) is an anionic surfactant containing the element P. 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)) Compound (A) is a compound represented by the above general formula (1). Compound (A) has the function of improving water permeability when used in combination with a surfactant (S) and / or a 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. １ may be linear or branched, but is preferably linear from the viewpoint of exerting the effects of the present invention. AO is an oxyalkylene group having 2 to 4 carbon atoms, and is preferably 2 carbon atoms from the viewpoint of exerting the effects of the present invention. m is an integer of 0 to 15, and is preferably 0 to 10, and 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)) Compound (B) is a compound represented by the above general formula (2). Compound (B) has the performance of simultaneously satisfying water permeability and stability when used in combination with a surfactant (S) or a nonionic surfactant (N) described later. 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. ２ and R ３may be linear or branched, but is preferably linear from the viewpoint of exerting the effects of the present invention. AO is an oxyalkylene group having 2 to 4 carbon atoms, and is preferably 2 carbon atoms from the viewpoint of exerting the effects of the present invention. m is an integer of 0 to 15, and is preferably 0 to 10, and 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, an ammonium, a phosphonium, an organic amine salt, or a quaternary ammonium salt. ｍ When there are two of them, they may be the same or different.

[0022] (Compound (C)) Compound (C) is a compound represented by the following general formula (3), and is a component optionally included in the present invention. The present invention is preferred because the inclusion of compound (C) results in 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. ４ 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 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. 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 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 When there are two or more, they may be the same or different.

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

[0024] In the formula, R ６ , R ７ and R ８ are each independently a hydrocarbon group having 16 to 22 carbon atoms, and from the viewpoint of exerting the effects of the present invention, 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. 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 application, 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 application, 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 from the viewpoint of instantaneous water permeability and repeated water permeability, 0 to 9 is more preferable. (AO) ｍ When there are two or more, they may be the same or different.

[0026] [Inorganic Phosphate (Salt) (IN)] From the viewpoint of achieving the effects of the present invention, the water permeability imparting agent of the present invention preferably contains inorganic phosphoric acid (salt) (IN). The inorganic phosphoric acid (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. 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). When used in combination with the surfactant (P), the anionic surfactant (S) exhibits excellent water permeability and stability. The anionic surfactant (S) includes sulfonic acid type and sulfate type. Examples of the sulfonic acid type include dialkyl sulfosuccinic acid and / or its salt (S-1), alkylbenzene sulfonate, alkyl sulfonate, alkanoyl methyl tauride, etc. Examples of the sulfate type include polyhydric alcohol fatty acid ester sulfate salt (S-2), alkyl sulfate ester salt, polyoxyethylene alkyl sulfate ester salt, etc.

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

[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 exhibits 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 exhibiting the effects of the present invention, 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 is preferred.

[0031] (Polyoxyalkylene polyhydric alcohol ether) (N1) 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, and sucrose. 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 ester is a compound 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, and sucrose. 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 aliphatic alcohol ether) (N3) A 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 proportion of ethylene oxide relative to the total alkylene oxide is preferably 20 mol% or more, more preferably 30 mol% or more, and even more preferably 40 mol% 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 ester is a compound 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, and sucrose. 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 to 1,000, more preferably 200 to 800, and even more preferably 300 to 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 referred to as polyhydroxy ester) (N6) Compounds which are esters of condensates of polyhydroxy esters and dicarboxylic acids, at least one hydroxyl group of which is 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 hydroxyl groups of the polyhydric alcohol are esterified. Therefore, polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol esters are esters having multiple hydroxyl groups.

[0047] From the viewpoint of excellent water permeability and stability, the HLB value of the nonionic surfactant (N) is preferably 7 to 11, and 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 value and inorganic value used to derive the HLB can be calculated using the values ​​in the table described on page 213 of "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 this invention, the nonvolatile content refers to the bone-dry component when the treatment agent is heat-treated at 105°C to remove the solvent and the like and reaches a constant weight.

[0049] The ratio of P1 to the sum (P1+P2+P3) of the following peak areas P1 to P3 in the spectrum of the nonvolatile content of the water permeability imparting agent of the present invention measured by P nuclear NMR [P1 / (P1+P2+P3)] is preferably 40 to 100% from the viewpoint of water permeability and stability. P1: Peak area in the range of 0 to 10 ppm P2: Peak area in the range of -25 to -3 ppm P3: Peak area in the range of -3 to 0 ppm Compounds exhibiting peaks in the spectrum from -25 to 10 ppm tend to be mainly assigned to inorganic phosphoric acid or compound (A), compound (B), compound (D), and compound (C), in that order, from the low magnetic field side. A ratio of [P1 / (P1+P2+P3)] of 40 to 100% is preferred because water permeability and stability are excellent. 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. Furthermore, for example, 40 to 90% is preferred, 45 to 85% is more preferred, and 50 to 75% is even more preferred. The method for measuring the peak areas of P1 to P3 is 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 following general formula (1) 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), the P NMR integral value assigned to the compound (B) represented by the general formula (2), the P NMR integral value assigned to the compound (C) represented by the general formula (3), the P NMR integral value assigned to the compound (D) and the inorganic phosphate (IN) (hereinafter referred to as the sum (A+B+C+D+IN) of the P NMR integral values. Compound (A) is ３１ Approximately 30 mg of the nonvolatile content of the measurement sample was weighed into an NMR sample tube with a diameter of 5 mm, and approximately 0.5 ml of heavy water (D ２ O) or deuterated chloroform (CDCl ３ ) and dissolve.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 preferred, the same applies hereinafter). The upper limit of [A / (A+B+C+D+IN)] is preferably 98%, 95%, 92%, 90%, and 80%, in that order, in that order (the latter is more preferred, the same applies hereinafter).

[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, and 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) attributed 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) attributed 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] From the viewpoint of achieving the effects of the present invention, the weight ratio of the anionic surfactant to the total of the anionic surfactant and the nonionic surfactant in the water permeability imparting agent [anionic / (anionic + nonionic)] is preferably 40 to 100% by weight. The lower limit of the weight ratio of the anionic surfactant to the total of the anionic surfactant and the nonionic surfactant 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 used for menstrual blood permeability, since it exhibits a more effective effect. From the viewpoint of superior stability, the concentration of the non-volatile matter in the water-permeability imparting agent is preferably 50 to 100 wt %, more preferably 55 to 95 wt %, and even more preferably 60 to 90 wt %.

[0057] From the viewpoint of achieving superior stability, the water permeability imparting agent of the present invention preferably has a silicone compound content of less than 50% by weight relative to the non-volatile content of the water permeability imparting agent, 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] [Fibers] The fibers of the present invention are obtained by adding the above-mentioned water-permeability-imparting agent to raw fiber. The fibers of the present invention may be short fibers or long fibers, and short fibers are preferred in terms of water permeability. The adhesion rate of the non-volatile content of the water-permeability-imparting agent to the fiber body (raw fiber) is preferably 0.03 to 2 wt %, more preferably 0.1 to 1 wt %, based on the fiber body in terms of antistatic properties 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 combinations, 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 also suitable for polyolefin fibers. Furthermore, it is preferable that these fiber bodies are fibers for producing nonwoven fabrics in terms of water permeability.

[0060] The cross-sectional structure of the fiber can be exemplified by sheath-core, side-by-side, eccentric sheath-core, multilayer, radial, or sea-island structures. However, from the viewpoint of productivity in the fiber production process and ease of nonwoven fabric processing, the sheath-core structure including eccentricity or the side-by-side 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 without dilution or the like, or may be applied to the fiber body after diluting with water or the like to a concentration such that the weight ratio of the nonvolatile content is 0.5 to 5 wt %. The process for applying the water-permeability-imparting agent to the fiber body may be any process, such as the fiber body spinning process, drawing process, or crimping process. 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 achieves 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 nonwoven fabric obtained by adding a water-permeability-imparting agent to a raw nonwoven fabric without the addition of a water-permeability-imparting agent, 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. Web formation methods using short fibers include dry methods such as carding and air-laid methods, and wet methods such as papermaking. Web formation methods using long fibers include spunbonding, meltblowing, and flash spinning. Interfiber bonding methods include chemical bonding, thermal bonding, needle punching, spunlace, and stitch bonding. The method for producing the nonwoven fabric of the present invention preferably includes a step of passing the fibers of the present invention through a carding machine or the like to produce a fiber web and then heat-treating the resulting fiber web. In other words, the water-permeability-imparting agent of the present invention is particularly suitable for use when the nonwoven fabric production process includes a step of heat-treating the 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 heat-treating a fiber web to bond it, in the case of a sheath-core 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 agent has been added are passed through a carding machine or the like to form a web, which is then heat-treated as described above to bond and integrate the web, and a method in which the water-permeable fibers (staple fibers) of the present invention are mixed with pulp or the like when laminating the web in an airlaid process, and then heat-treated as described above to bond the web. Other examples of methods for producing nonwoven fabrics 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, a melt-blowing method, a flash spinning method, or the like, and the resulting product is heat-treated with a heated roll or heated air, or the water-permeability imparting agent of the present invention is attached to the product heat-treated with a heated roll or heated air, or the like.

[0063] In one example of the spunbonding method, a composite fiber resin is spun, followed by cooling the spun composite long fiber filaments with a cooling fluid and applying tension to the filaments 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 water-permeability-imparting agent of the present invention can be applied to the resulting spunbonded nonwoven fabric by roll coating methods such as gravure, flexography, and gate roll methods, or spray coating, but is not particularly limited as long as the amount applied to the nonwoven fabric can be adjusted on each side. Drying methods include drying with hot air or infrared rays, drying by contact with a heat source, and the like.

[0064] [Absorbent Article] The absorbent article of the present invention comprises 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 as a second sheet, absorbent body, absorbent pad, etc.

[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 shown in Tables 1 to 7 were mixed with water to prepare the water permeability imparting agents of Examples 1 to 46 and Comparative Examples 1 to 6, each with a nonvolatile content of 50% by weight. Each of the resulting water permeability imparting agents was diluted with warm water at approximately 60°C to a concentration of 0.9% by weight of nonvolatile content. Next, 150 g of each diluted solution of the water permeability imparting agent was applied to 300 g of fiber body using the dip oiling method, resulting in a nonvolatile content of 0.45% by weight of the water permeability imparting agent attached to the water-permeable fiber. The fiber body was a polypropylene (core)-polyethylene (sheath) composite fiber with a single fiber fineness of 2.2 Dtex and a fiber length of 38 mm, to which no fiber treatment agent such as a water permeability imparting agent had been applied. The fibers to which the diluted solutions of the water-permeability imparting agents were applied were placed in a hot air dryer at 80°C for 2 hours, and then left to dry at room temperature for 8 hours or more to obtain water-permeable fibers.

[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: ​​Compound of general formula (1), R １ = n-stearyl group, m = 0, M １ : H or K, M ２ A-2: Compound of general formula (1), R １ = n-cetearyl group, m = 0, M １ : H or K, M ２ A-3 Compound of general formula (1), R １ = lauryl group, m = 0, M １ : H or K, M ２ A-4 Compound of general formula (1), R １ = n-octyl group, m = 0, M １ : H or K, M ２ A-5 Compound of general formula (1), R １ = n-hexyl group, m = 0, M １ : H or K, M ２ : H or K B-1 Compound of general formula (2), R ２ = n-stearyl group, R ３ = n-stearyl group, m = 0, M １ B-2 Compound of general formula (2), R２ = n-cetearyl group, R ３ = n-cetearyl group, m = 0, M １ B-3 Compound of general formula (2), R ２ = lauryl group, R ３ = lauryl group, m = 0, M １ B-4 Compound of general formula (2), R ２ = n-octyl group, R ３ = n-octyl group, m = 0, M １ B-5 Compound of general formula (2), R ２ = n-hexyl group, R ３ = n-hexyl group, m = 0, M １ : H or K C-1 Compound of general formula (3), 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 ２D-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 Ditridecyl sulfosuccinate sodium salt S-3 Rapeseed oil sulfate sodium salt S-4 Castor oil sulfate sodium salt s-1 Polyoxyethylene 3 mole lauryl sulfate sodium salt s-2 Alkane (C12-15) sulfonate sodium salt N-1 Sorbitan monooleate N-2 Polyoxyethylene 20 mole sorbitan trioleate N-3 Alkyl (C12,13) ​​PO 2 moles EO 6 moles random adduct N-4 Glycerin PO 85.3 moles EO 21.8 moles block adduct N-5 Ester of maleic acid condensate of polyoxyethylene (20 moles) castor wax 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 moles 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 PO 67 moles EO 11 mole block adduct n-9 Pentaerythritol PO 10 4 mole adduct n-10 Pentaerythritol PO 104 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 fiber weight was 25 g / m ２Webs of the above formula 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 webs were heat-treated at 135°C in an air-through hot air circulation dryer to fix the webs, and nonwoven fabrics were obtained. The water permeability of the obtained nonwoven fabrics 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, and the stability was evaluated according to the following criteria. ◎ is the best rating, and 〇 or above is suitable for practical use. [Evaluation criteria] ◎ (Good): No precipitation or separation occurs, and the agent remains in a homogeneous state similar to that at the time of preparation. 〇 (Fair): Very little precipitation or separation occurs, but the agent is restored to a homogeneous state similar to that at the time of preparation by stirring at 100 rpm for about 10 minutes. △ (Fail): Precipitation or separation occurs, and the agent is not restored to a homogeneous state by stirring.

[0070] [Water permeability of nonwoven fabric] (Instantaneous water permeability of nonwoven fabric) A 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 at a height of 10 mm from the surface of the nonwoven fabric, and the time until the drop disappears 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 in less than 5 seconds is displayed. The number is evaluated according to the following criteria. ◎ is the best evaluation, and 〇 or above is suitable for practical use. [Evaluation criteria] ◎ (Good)... 18 to 20 drops 〇 (Fair)... 11 to 17 drops △ (Fail)... 1 to 10 drops

[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 water permeation time was measured. After permeation, the nonwoven fabric was sandwiched between two sheets of filter paper (Toyo Roshi, No. 5), and a plate (10 cm x 10 cm) and a weight (500 g) were placed on top of it. The nonwoven fabric was left to dehydrate for 3 minutes, and then air-dried for another 5 minutes. The same procedure was repeated for the nonwoven fabric used in the test. In this repeated test, the shorter the water permeation time, the better, even after repeated testing. The time (in seconds) after the fifth repeated test was evaluated according to the following criteria. ◎ is the best evaluation, and 〇 or higher is suitable for practical use. [Evaluation criteria] ◎ (Good): Less than 3 seconds 〇 (Acceptable): 3 to 10 seconds △ (Unacceptable): 10 seconds or more

[0072] [Liquid return prevention of nonwoven fabric] A nonwoven fabric (15 cm x 15 cm) was placed on top of filter paper, and 14 mL of physiological saline was dropped from a burette placed at a height of 30 mm from the surface of the nonwoven fabric. The nonwoven fabric was left to stand for 1 minute after the water droplets were completely absorbed. A 4 kg load was then placed on top of the nonwoven fabric. After leaving it to stand for 3 minutes, the load was removed, and a pre-weighed filter paper different from the above 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 to stand for 2 minutes, the load was removed, and the filter paper was weighed, and the increase in weight was taken as the amount of liquid return (g). The liquid return prevention was evaluated based on the amount of liquid return according to the following criteria. ◎ is the best rating, and 〇 or higher is suitable for practical use. ◎ (Good)...less than 0.5 g 〇 (Fair)...0.5 g to 1.5 g △ (Fail)...more than 1.5 g

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[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, an anionic surfactant (S) containing an S element (excluding the surfactant (P)), and at least one selected from 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 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 content was not 0.5 to 150 KOH mg / g (Comparative Examples 4 to 6), the problem of either repeated water permeability or stability, which is the problem of the present application, was not solved.

[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 phosphorus element, and at least one selected from an anionic surfactant (S) containing an sulfur element (excluding the surfactant (P)) and a nonionic surfactant (N), wherein the acid value of the nonvolatile matter of the water permeability imparting agent is 0.5 to 150 KOH mg / g, and 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). (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. (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.) (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. The water permeability imparting agent according to claim 1, wherein the ratio of anionic surfactants to the total of anionic surfactants and nonionic surfactants [anionic / (anionic+nonionic)] is 50 to 100% by weight.

3. The water-permeability imparting agent according to claim 1 or 2, 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. The water-permeability imparting agent according to any one of claims 1 to 3, 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 any one of claims 1 to 4, wherein the water-permeability imparting agent contains the surfactant (S), and the surfactant (S) contains a polyhydric alcohol fatty acid ester sulfate salt (S-2).

6. The water-permeability imparting agent according to any one of claims 1 to 5, which is for menstrual blood permeability.

7. The water-permeability imparting agent according to any one of claims 1 to 6, wherein the concentration of non-volatile matter in the water-permeability imparting agent is 50 to 100% by weight.

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

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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