JP2017184962A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which prevents skin rash of a wearer and suppresses generation of a bad odor.SOLUTION: An absorbent article includes a fumaric acid containing sheet. In the fumaric acid containing sheet, a sheet base material using paper as a main material contains fumaric acid. A content rate of the fumaric acid in the fumaric acid containing sheet ranges from 0.00015 mass% to 1.5 mass%. The fumaric acid does not dissolve immediately and gradually dissolves when making contact with body fluids (urine, blood, or the like), thereby preventing the fumaric acid containing sheet and the periphery from being alkaline for a long time. Further, the fumaric acid shows an action of suppressing proliferation of putrefaction bacteria, thereby preventing the generation of a bad odor in the absorbent article in which the body fluid is absorbed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article, and in particular, to prevention of wearer's skin irritation and antibacterial and deodorization of the absorbent article after absorbing body fluids.

  Conventionally, microorganisms in absorbent articles can be obtained by using functional paper containing antibacterial agents such as silver ions, polyphenols, and ammonium salts in the construction of absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads. It is known to prevent the growth of odor and suppress malodor (for example, Patent Document 1).

  However, when such a functional paper is used for an absorbent article, the antibacterial agent contained in the functional paper reacts with the residual chlorine in the pulp contained in the absorbent article and the superabsorbent resin. As a result, there is a problem that the effect of the antibacterial agent is attenuated in a short time, and the effect cannot be fully exhibited.

  Patent Document 2 exemplifies organic acids such as citric acid and malic acid as antibacterial agents. Organic acids such as citric acid and malic acid, unlike antibacterial agents such as silver ions, polyphenols, and ammonium salts, do not attenuate the antibacterial effect in a short period of time. However, citric acid and malic acid are water-soluble, so even if they are placed between the top sheet of the absorbent article or between the top sheet and the absorbent body, these acids may be absorbed by body fluids (eg, urine, blood). Easily dissolves. Since the dissolved organic acid is transferred to the absorbent body, the organic acid is not retained at the place where the absorbent article is in contact with the wearer. Problems such as rashes occur.

JP-A-11-001895 JP 2014-079284 A

  The present invention has been made in view of the above circumstances, and prevents the wearer's skin irritation, suppresses the growth of germs such as spoilage bacteria after excretion, and thus suppresses the generation of malodors for a long time. It aims at providing the absorbent article which can be performed.

  The absorbent article of the present invention includes an absorber and a fumaric acid-containing sheet, and the fumaric acid-containing sheet contains fumaric acid in a sheet base material mainly composed of paper, and the fumaric acid-containing sheet The fumaric acid content in is from 0.00015 mass% to 1.5 mass%.

  The absorbent article of the present invention is characterized by being contained throughout the longitudinal direction and the width direction of the sheet base material.

  Furthermore, the absorbent article of the present invention is characterized in that it is contained in a larger amount on the other side than on one side of the sheet base material.

  Furthermore, the absorbent article of the present invention includes a top sheet disposed on the skin surface side of the absorbent body and a back sheet disposed on the non-skin surface side of the absorbent body, and the top sheet is the fumarate. It is an acid-containing sheet.

  Furthermore, the absorbent article of the present invention includes a top sheet disposed on the skin surface side of the absorbent body, and a back sheet disposed on the non-skin surface side of the absorbent body. The absorbent body and the top The fumaric acid-containing sheet is disposed between the sheets.

  The manufacturing method of the absorbent article of the present invention includes a step of containing fumaric acid in a sheet base material, and drying the fumaric acid-containing sheet by drying the sheet base material containing fumaric acid for 1 week or more in an air atmosphere. And obtaining a step.

  According to the absorbent article of the present invention, it is possible to prevent the wearer's skin irritation, and to suppress the propagation of various bacteria after excretion and thus the generation of malodor, so that the antibacterial and deodorizing effects can be maintained for a long time.

FIG. 1 is a plan view showing an embodiment of an absorbent article of the present invention. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG.

  The absorbent article of the present invention includes a fumaric acid-containing sheet, and the fumaric acid-containing sheet contains fumaric acid in a sheet base material mainly composed of paper, and the content of fumaric acid is 0.00015 mass. % To 1.5% by mass.

  The absorbent article of the present invention can be used to absorb bodily fluids discharged from the human body, and can be suitably used particularly as absorbent articles such as incontinence pads, disposable diapers, and sanitary napkins. Moreover, the shape of an absorbent article is not specifically limited.

  Fumaric acid has a water solubility (25 ° C.) of 0.63 g / 100 g and is hardly soluble in water. Even when such fumaric acid comes into contact with body fluids, it does not dissolve immediately, but gradually dissolves. In addition, fumaric acid has two carboxyl groups in the molecule and is acidic in the liquid. Therefore, if the fumaric acid-containing sheet is disposed in a part of the absorbent article that can come into contact with body fluid, the surrounding area can be prevented from becoming alkaline by the body fluid, and as a result, the fumaric acid-containing sheet is disposed in the absorbent article. By doing so, the wearer's skin irritation can be suppressed over a long period of time. Furthermore, since fumaric acid has an action of suppressing the growth of spoilage bacteria, if a fumaric acid-containing sheet is disposed around the water-absorbent resin powder holding the bodily fluid, from the absorbent article after absorbing the bodily fluid The generation of bad odor can be suppressed.

  Examples of the fumaric acid-containing sheet according to the present invention include a sheet in which fumaric acid is contained in a sheet base material, and a sheet in which fumaric acid is coated on a sheet base material.

  As the sheet base material of the fumaric acid-containing sheet, a liquid-permeable sheet material, particularly a sheet base material mainly composed of paper is preferable. Examples of the paper include crepe paper, absorbent paper, thin paper, sanitary paper, etc., and paper made mainly of plant fibers (for example, pulp). Specifically, tissue is preferable, but not limited thereto. If the main material of the sheet base material is paper, the fumaric acid-containing liquid is sufficiently absorbed by the sheet base material compared to the sheet base material made of nonwoven fabric as the main material. Can be given an antibacterial function. Furthermore, since it is easy to process and inexpensive, it is excellent in terms of manufacturing and cost.

  The fumaric acid content in the fumaric acid-containing sheet is preferably 0.00015% by mass or more, more preferably 0.0015% by mass or more, still more preferably 0.015% by mass or more, and 1.5% by mass or less. Is preferable, more preferably 1.0% by mass or less, and still more preferably 0.2% by mass or less. If content is in the said range, the effect of suppression of skin irritation and odor will improve more.

As a method for measuring the content of fumaric acid in the fumaric acid-containing sheet, the fumaric acid-containing sheet cut into a predetermined size (for example, 1 cm ² ) is contained by Soxhlet extraction using a large amount of ethanol (for example, 2 L). After all fumaric acid to be dissolved is dissolved in ethanol, it is obtained by measuring the mass of fumaric acid in the solution. As will be described later, when the fumaric acid-containing liquid is applied to and / or sprayed on the sheet base material, the fumaric acid concentration of the fumaric acid-containing liquid and the amount of liquid applied and / or sprayed may be obtained. it can.

  As a method for incorporating fumaric acid into the sheet base material, for example, (a) a fumaric acid-containing solution obtained by dissolving fumaric acid in a solvent is applied to and / or sprayed on the sheet base material, so that the fumaric acid particles are contained in the sheet base material. (B) A method of mixing a material constituting the sheet base material with fumaric acid particles or a fumaric acid-containing liquid at the time of manufacturing the sheet base material; (c) Absorbing at the time of manufacturing the absorbent article. Examples include, but are not limited to, a method of applying and / or spraying a fumaric acid-containing liquid to a sheet base material constituting an article; and (d) a method of combining any of (a) to (c) above. .

  When fumaric acid is contained in the sheet base material, it suffices that fumaric acid is contained in at least a region corresponding to the body fluid discharge part (urination part, haemorrhagic blood part) of the sheet base material. From the viewpoint of maintaining the deodorizing effect of the absorbent article of the present invention and manufacturing, it is preferable that the fumaric acid is contained throughout the longitudinal direction and the width direction when the fumaric acid-containing sheet is viewed from the plane side. Moreover, as content of the fumaric acid in the thickness direction of a fumaric acid containing sheet | seat, the aspect which contains fumaric acid uniformly; The aspect in which one side contains more fumaric acids than the other side, ie, the skin surface (wearing) The surface facing the person) is an embodiment containing more fumaric acid than the non-skin surface (surface away from the wearer, also referred to as the outer surface), or an embodiment wherein the non-skin surface contains more fumaric acid than the skin surface; Is a mode in which more fumaric acid is contained than in the substantially central portion; an embodiment in which the substantially central portion contains more fumaric acid than the face on both sides.

  The average particle size of the fumaric acid particles is 30 μm or less, preferably 25 μm or less, more preferably 20 μm or less. If the average particle size is 30 μm or less, fumaric acid particles can be easily contained (for example, supported or covered) in the sheet base material, and dropping from the sheet base material can be suppressed. The lower limit of the average particle size of the fumaric acid particles is not particularly limited, but is preferably 0.05 μm.

  In the present invention, the average particle size of the fumaric acid particles can be measured by a laser diffraction / scattering particle size analyzer before the fumaric acid is contained in the sheet base material. For example, when the fumaric acid particles are supported by bringing the sheet base material and the fumaric acid particle dispersion into contact with each other as will be described later, the fumaric acid-containing sheet contains the average particle diameter of the fumaric acid particles in the fumaric acid particle dispersion. It can be regarded as the average particle size of the fumaric acid particles. The average particle size of the fumaric acid particles in the fumaric acid particle dispersion can be measured by a laser diffraction / scattering particle size analyzer. In the present invention, the average particle size of the fumaric acid particles is a volume-based average particle size.

  The fumaric acid particles are not particularly limited, but it is preferable that at least a part of the particle surface is coated with a dispersant. By being coated with the dispersant, the dispersant acts as a binder between the fumaric acid particles and the sheet substrate. Therefore, the retention property of the fumaric acid particles on the sheet base material is further improved, and the fumaric acid particles are further prevented from dropping from the sheet base material. For example, as will be described later, when a fumaric acid particle dispersion is applied to a sheet base material to contain fumaric acid particles, the fumaric acid particles can be dispersed more uniformly by adding a dispersant to the dispersion. Can do. The coating of the fumaric acid particles with the dispersant can be performed, for example, by mixing the fumaric acid particles, the dispersing agent and the solvent, and then removing the solvent.

  The dispersant is not particularly limited as long as it has an effect of improving the dispersibility of fumaric acid particles in the dispersion, and for example, a polymer-type dispersant and a surfactant-type dispersant can be used. . The polymer type dispersant and the surfactant type dispersant include anionic, nonionic and cationic dispersants, respectively. Among these, anionic or nonionic is preferable.

  The content of fumaric acid in the fumaric acid-containing liquid is preferably 0.0015% by mass or more, more preferably 0.015% by mass or more, still more preferably 0.15% by mass or more, and preferably 30% by mass or less. More preferably, it is 1.0 mass% or less, More preferably, it is 0.7 mass% or less. If the content rate of fumaric acid is within the above range, the supportability and covering property to the sheet substrate are further improved.

  As the solvent of the fumaric acid-containing liquid, for example, water, an organic solvent, or a mixed solution thereof can be used. Although not particularly limited, it is preferable to use only water as a solvent in consideration of cost and wearer safety. Examples of the organic solvent include methanol, ethanol, acetone, glycerin, ethylene glycol, and propylene glycol. When the mixed solution is used, the mixing ratio of water and the organic solvent can be appropriately changed by those skilled in the art. The organic solvent is preferably hydrophilic.

  The fumaric acid-containing sheet can be obtained, for example, by removing part or all of the solvent in the fumaric acid-containing liquid after containing the fumaric acid-containing liquid in the sheet base material. The liquid content of the fumaric acid-containing sheet obtained by removing the solvent is preferably 0% by mass to 20% by mass, more preferably 0% by mass to 15% by mass, and more preferably 0% by mass with respect to the fumaric acid-containing sheet. 10 mass% is more preferable.

  The method for distilling off (drying) the solvent is not particularly limited, and examples thereof include drying in an air atmosphere, hot air drying, vacuum drying, drying using a dryer, etc., but in an air atmosphere (for example, 25 C.) is preferable for drying for 1 week or more. When a method of drying for 1 week or more in an air atmosphere is used, fumaric acid dissolved in the solvent is slowly recrystallized, so that the crystal structure tends to be dense (ie, strong). If the crystal structure is dense, the fumaric acid crystal is stabilized, and thus poorly water-soluble (water resistance) is enhanced. As a result, it is considered that the amount of fumaric acid eluted by urine is reduced, and an increase in pH that causes skin irritation is suppressed.

  The absorbent article of this invention is equipped with the absorber which can absorb a bodily fluid. The absorber is composed of at least one absorption layer. The absorbent layer preferably contains the water absorbent resin powder as a water absorbent material. The absorbent layer may further contain water-absorbing fibers as a water-absorbing material. Examples of the water absorbent fibers include pulp fibers, cellulose fibers, and rayon. The absorbent layer may contain a fiber base material in addition to the water absorbent resin powder. Examples of the fiber base material include heat fusion fibers. The heat-fusible fiber is used for improving shape retention. Specific examples of the heat-sealing fiber include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, and composite fibers. The absorbent layer containing only the water absorbent resin powder as the water absorbent material can be thinned. The absorption layer containing a fiber base material is excellent in dispersibility of body fluids.

  The absorbent layer is, for example, a mixture of a hydrophilic fiber aggregate layer such as pulverized pulp fiber or cellulose fiber mixed with granular water-absorbent resin powder, fixed to a paper sheet such as tissue, or wrapped, rectangular, hourglass type It can be obtained by molding into a predetermined shape such as a gourd mold or a battledore mold.

  The water-absorbent resin powder used in the present invention is not particularly limited, but is a (A) cross-linked polymer containing acrylic acid as a main constituent, wherein at least a part of the carboxyl group is neutralized. It is preferable to do. 90 mass% or more is preferable, as for the content rate of the acrylic acid component which comprises the said (A) crosslinked polymer, 95 mass% or more is more preferable, 99 mass% or less is preferable, and 97 mass% or less is more preferable. If the content rate of an acrylic acid component exists in the said range, the water-absorbing-resin powder obtained will become easy to express desired absorption performance.

(A) The cation that neutralizes at least a part of the carboxyl group of the crosslinked polymer is not particularly limited. For example, alkali metal ions such as lithium, sodium, and potassium; alkaline earth metal ions such as magnesium and calcium And so on. The degree of neutralization of the carboxyl group of the crosslinked polymer is preferably 60 mol% or more, more preferably 65 mol% or more. This is because if the degree of neutralization is too low, the absorption performance of the resulting water-absorbent resin powder may deteriorate. The upper limit of the degree of neutralization is not particularly limited, and all of the carboxyl groups may be neutralized. In addition, a neutralization degree is calculated | required by a following formula.
Degree of neutralization (mol%) = 100 × “number of moles of carboxyl groups neutralized in crosslinked polymer” / “total number of moles of carboxyl groups in crosslinked polymer (including neutralized and unneutralized)”

  The crosslinked polymer comprises (a1) a water-soluble ethylenically unsaturated monomer and / or (a1) a water-soluble ethylenically unsaturated monomer by hydrolysis, (a2) a hydrolyzable monomer, and (b) an internal crosslinking agent. And those obtained by polymerizing an unsaturated monomer composition containing

  As the (a1) water-soluble ethylenically unsaturated monomer, for example, a monomer having at least one water-soluble substituent and an ethylenically unsaturated group can be used. The water-soluble monomer means a monomer having a property of dissolving at least 100 g in 100 g of water at 25 ° C. The (a2) hydrolyzable monomer is hydrolyzed by the action of 50 ° C. water and, if necessary, a catalyst (acid or base) to produce (a1) a water-soluble ethylenically unsaturated monomer. (A2) Hydrolysis of the hydrolyzable monomer may be performed either during the polymerization of the cross-linked polymer, after the polymerization, or both of these, but from the viewpoint of the molecular weight of the resulting water-absorbent resin powder, and the like.

  Examples of the water-soluble substituent include a carboxyl group, a sulfo group, a sulfooxy group, a phosphono group, a hydroxyl group, a carbamoyl group, an amino group, or a salt thereof, and an ammonium salt. A salt of a carboxyl group (carboxylate) ), A salt of a sulfo group (sulfonate), and an ammonium salt. Examples of the salt include alkali metal salts such as lithium, sodium, and potassium; alkaline earth metal salts such as magnesium and calcium. The ammonium salt may be either a primary to tertiary amine salt or a quaternary ammonium salt. Of these salts, alkali metal salts and ammonium salts are preferable, alkali metal salts are more preferable, and sodium salts are more preferable from the viewpoint of absorption characteristics.

  The water-soluble ethylenically unsaturated monomer having a carboxyl group and / or a salt thereof is preferably an unsaturated carboxylic acid having 3 to 30 carbon atoms and / or a salt thereof. Specific examples of the water-soluble ethylenically unsaturated monomer having a carboxyl group and / or a salt thereof include unsaturated monocarboxylic acids such as (meth) acrylic acid and (meth) acrylate and / or salts thereof; maleic acid , Unsaturated dicarboxylic acid such as maleate and / or its salt; monoalkyl ester of unsaturated dicarboxylic acid such as maleic acid monobutyl ester and / or its salt and the like. In the description of the present invention, “(meth) acryl” means “acryl” and / or “methacryl”. Examples of the water-soluble ethylenically unsaturated monomer having a sulfo group and / or a salt thereof include vinyl sulfonic acid and styrene sulfonic acid.

  The (a2) hydrolyzable monomer is not particularly limited, but an ethylenically unsaturated monomer having at least one hydrolyzable substituent that becomes a water-soluble substituent by hydrolysis is preferable. Examples of the hydrolyzable substituent include a group containing an acid anhydride, a group containing an ester bond, and a cyano group. Examples of the ethylenically unsaturated monomer having a group containing an acid anhydride include unsaturated dicarboxylic acid anhydrides having 4 to 20 carbon atoms. Examples of the ethylenically unsaturated monomer having a group containing an ester bond include lower alkyl esters of ethylenically unsaturated carboxylic acids; esters of ethylenically unsaturated alcohols. Examples of the ethylenically unsaturated monomer having a cyano group include vinyl group-containing nitrile compounds such as (meth) acrylonitrile.

  (A1) The water-soluble ethylenically unsaturated monomer and (a2) hydrolyzable monomer may be used alone or as a mixture of two or more. The same applies when (a1) a water-soluble ethylenically unsaturated monomer and (a2) a hydrolyzable monomer are used in combination.

  (A) As a monomer constituting the crosslinked polymer, (a1) a water-soluble ethylenically unsaturated monomer and (a2) a hydrolyzable monomer, (a3) other vinyl monomers copolymerizable with these are used. be able to. The (a3) other vinyl monomer may be a hydrophobic vinyl monomer or the like, but is not limited thereto. From the viewpoint of absorption characteristics, the content of (a3) other vinyl monomer is preferably 0 mol%.

  (B) As the internal crosslinking agent, (b1) an internal crosslinking agent having two or more ethylenically unsaturated groups; (b2) (a1) a water-soluble substituent of a water-soluble ethylenically unsaturated monomer and / or (a2) An internal cross-linking agent having at least one functional group capable of reacting with a water-soluble substituent generated by hydrolysis of a hydrolyzable monomer and having at least one ethylenically unsaturated group; (b3) (a1) An internal cross-linking agent having at least two or more functional groups capable of reacting with water-soluble substituents of water-soluble ethylenically unsaturated monomers and / or (a2) water-soluble substituents generated by hydrolysis of hydrolyzable monomers; Can be mentioned.

  The (b1) internal crosslinking agent includes bis (meth) acrylamide having 8 to 12 carbon atoms, poly (meth) acrylate of a polyol having 2 to 10 carbon atoms, polyallylamine having 2 to 10 carbon atoms, and 2 to 10 carbon atoms. And poly (meth) allyl ether of polyols. Specific examples thereof include N, N′-methylenebis (meth) acrylamide, ethylene glycol di (meth) acrylate, poly (degree of polymerization 2 to 5) ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, Glycerin (di or tri) acrylate, trimethylolpropane triacrylate, diallylamine, triallylamine, triallyl cyanurate, triallyl isocyanurate, tetraallyloxyethane, pentaerythritol diallyl ether, pentaerythritol triallyl ether, pentaerythritol tetraallyl ether And diglycerin di (meth) acrylate and the like.

  Examples of the (b2) internal crosslinking agent include an ethylenically unsaturated compound having an epoxy group having 6 to 8 carbon atoms, an ethylenically unsaturated compound having a hydroxyl group having 4 to 8 carbon atoms, and an isocyanato group having 4 to 8 carbon atoms. Examples thereof include ethylenically unsaturated compounds.

  Examples of the (b3) internal cross-linking agent include polyhydric alcohols, polyhydric glycidyls, polyhydric amines, polyhydric aziridines and polyhydric isocyanates.

  (A) As a polymerization form of a crosslinked polymer, a conventionally known method can be used, and a solution polymerization method, an emulsion polymerization method, a suspension polymerization method, and a reverse phase suspension polymerization method can be applied. Further, the shape of the polymerization solution at the time of polymerization may be a thin film shape, a spray shape, or the like. As a polymerization control method, an adiabatic polymerization method, a temperature control polymerization method, an isothermal polymerization method, or the like can be applied. When applying the suspension polymerization method or the reverse phase suspension polymerization method as the polymerization method, conventionally known dispersants, protective colloids and the like can be used as necessary. In the case of the reverse phase suspension polymerization method, the polymerization can be carried out using a solvent such as hexane. As the polymerization method, a solution polymerization method is preferable, and it is not necessary to use an organic solvent and the like, which is advantageous in terms of production cost.

  The hydrogel {consisting of a crosslinked polymer and water} obtained by polymerization can be chopped as necessary. The size (longest diameter) of the gel after chopping is preferably 50 μm to 10 cm. Within this range, the drying property in the drying process is further improved. Shredding can be performed by a known method. For example, the shredding can be performed using a conventional shredding device such as a bex mill, rubber chopper, pharma mill, mincing machine, impact pulverizer, and roll pulverizer.

  When using a solvent (organic solvent, water, etc.) for the polymerization, it is preferable to distill off the solvent after the polymerization. When the solvent contains an organic solvent, the content (% by mass) of the organic solvent after distillation is preferably 0% by mass to 10% by mass with respect to the mass of the crosslinked polymer (100% by mass). Within the above range, the absorption performance (particularly the water retention amount) of the water-absorbent resin powder is further improved.

  As a method of distilling off the solvent (including water), a method of distilling (drying) with hot air at a temperature of 80 ° C. to 230 ° C., a thin film drying method using a drum dryer or the like heated to 100 ° C. to 230 ° C., (Heating) A vacuum drying method, a freeze drying method, a drying method using infrared rays, decantation, filtration, and the like can be applied.

  (A) The crosslinked polymer can be pulverized after drying. The pulverization method is not particularly limited, and for example, a normal pulverizer such as a hammer pulverizer, an impact pulverizer, a roll pulverizer, and a shet airflow pulverizer can be used. The pulverized (A) crosslinked polymer can be adjusted in particle size by sieving or the like, if necessary. (A) As for the weight average particle diameter (micrometer) of a crosslinked polymer, 100 micrometers-800 micrometers are preferable. (A) If the weight average particle diameter (μm) of the crosslinked polymer is within the above range, the absorption performance is further improved. In addition, the weight average particle diameter was measured using a low-tap test sieve shaker and a standard sieve (JIS Z8801-1: 2006), Perry's Chemical Engineers Handbook, 6th edition (McGlow Hill Book Company, 1984). , Page 21).

  (A) The crosslinked polymer can be subjected to surface crosslinking as required. As the crosslinking agent (surface crosslinking agent) for performing the surface crosslinking, the same as the (b) internal crosslinking agent can be used. As the surface cross-linking agent, from the viewpoint of the absorption performance of the water-absorbent resin powder, the (b3) cross-linking agent is preferable, more preferably polyvalent glycidyl, still more preferably ethylene glycol diglycidyl ether and glycerin diglycidyl ether, most preferably. Is ethylene glycol diglycidyl ether.

  (A) The crosslinked polymer may be one kind or a mixture of two or more kinds. (A) The crosslinked polymer may be further treated with (B) a surface modifier. (B) As surface modifiers, polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly) aluminum chloride, hydrates thereof; polyethyleneimine, polyvinylamine, polyallylamine, etc. Polycation compound; inorganic fine particles; (B1) surface modifier containing a hydrocarbon group; (B2) surface modifier containing a hydrocarbon group having a fluorine atom; and (B3) a surface having a polysiloxane structure. Examples thereof include modifiers.

Examples of the inorganic fine particles include silicon oxide (silica), aluminum oxide (alumina), iron oxide, titanium oxide, magnesium oxide, oxides such as zirconium oxide, carbides such as silicon carbide and aluminum carbide, and titanium nitride. Examples thereof include nitrides and composites thereof (for example, zeolite and talc). Of these, oxides are preferable, and silicon oxide is more preferable. The volume average particle diameter of the inorganic fine particles is not particularly limited, but is preferably 1 nm to 500 nm. The specific surface area of the inorganic fine ^particles, 20m ² / ^g~4000m 2 / g are preferred. When the specific surface area is within this range, the absorption performance is further improved. The specific surface area is measured according to JIS Z8830: 2001 (nitrogen, volume method, multipoint method).

(A) As a method of treating the crosslinked polymer with (B) the surface modifier, if (B) the surface modifier is treated so that it exists on the surface of the (A) crosslinked polymer, in particular It is not limited. However, (B) the surface modifier is mixed with (A) the dried polymer of the cross-linked polymer, not (A) the hydrogel of the cross-linked polymer or (A) the polymer solution before polymerizing the cross-linked polymer. It is preferable from the viewpoint of controlling the amount of the surface modifier (B) on the surface. The mixing is preferably performed uniformly.

  The shape of the water-absorbent resin powder is not particularly limited, and examples thereof include an irregularly crushed shape, a flake shape, a pearl shape, and a rice grain shape. Among these, from the viewpoint of good entanglement with the fibrous material in the use of paper diapers and the like and no fear of dropping off from the fibrous material, an irregular crushed shape is preferable.

  The water-absorbent resin powder preferably has an absorption rate by a vortex method of 5 seconds or more, more preferably 7 seconds or more, preferably 55 seconds or less, and more preferably 53 seconds or less. preferable. When the absorption rate exceeds 55 seconds, the bodily fluid excretion rate is high, and when a large amount of bodily fluid is excreted at a time, the bodily fluid cannot be sufficiently absorbed. As a result, liquid leakage tends to occur. The absorption rate is preferably as small as possible, but if it is less than 5 seconds, the stability of the water-absorbent resin powder to urine, particularly the stability under load, may be lowered. The absorption speed by the vortex method is evaluated by measuring the time (seconds) to absorb the body fluid. Therefore, the shorter the measurement time (seconds), the greater the rate at which the water absorbent resin powder absorbs body fluid.

  The water absorbent resin powder preferably has an absorption capacity of 50 g / g or more and 70 g / g or less. The absorption rate is more preferably 52 g / g or more, particularly preferably 54 g / g or more, more preferably 68 g / g or less, and particularly preferably 64 g / g or less. The absorption ratio is a scale indicating how much water absorbent resin powder can absorb water. When the absorption ratio is 50 g / g or more, the absorption capacity can be maintained at a predetermined level with a small amount of water-absorbent resin powder, and it becomes easy to produce a thin absorber. The absorption capacity is preferably as large as possible from the viewpoint of preventing liquid leakage, but is preferably 70 g / g or less. This is because when the absorption rate is 70 g / g or less, the stability of the water-absorbent resin powder to urine is improved.

  The water-absorbent resin powder preferably has a water retention amount of 20 g / g or more and 65 g / g or less. The water retention amount is more preferably 22 g / g or more, particularly preferably 24 g / g or more, more preferably 63 g / g or less, and particularly preferably 61 g / g or less. The water retention amount is a scale indicating how much the liquid absorbed by the water absorbent resin powder can be retained. When the water retention amount is 20 g / g or more, the body fluid retention capacity can be maintained at a predetermined level with a small amount of the water-absorbent resin powder, and it becomes easy to produce a thin absorbent body. The water retention amount is preferably as large as possible from the viewpoint of preventing liquid leakage, but is preferably 65 g / g or less. This is because when the water retention amount is 65 g / g or less, the stability of the water-absorbent resin powder to urine is improved.

  The absorption rate, absorption rate, and water retention amount of the water-absorbent resin powder are adjusted by appropriately selecting (A) the composition of the crosslinked polymer, the type of surface modifier, the particle size of the water-absorbent resin powder, the drying conditions, and the like. Can do.

  The water-absorbent resin powder contains additives such as preservatives, fungicides, antibacterial agents, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorants, inorganic powders and organic fibrous materials. Can do. Examples of the additive include those exemplified in JP2003-225565A, JP2006-131767A, and the like. When these additives are contained, the content (% by mass) of the additive is preferably 0.001% by mass to 10% by mass, more preferably based on (A) the crosslinked polymer (100% by mass). It is 0.01 mass%-5 mass%, More preferably, it is 0.05 mass%-1 mass%, Most preferably, it is 0.1 mass%-0.5 mass%.

The basis weight of the water-absorbent resin powder in the absorbent article is preferably 50 g / m ² or more, more preferably 75 g / m ² or more, still more preferably 100 g / m ² or more, and 800 g / m ² or less. Preferably, it is 700 g / m ² or less, more preferably 600 g / m ² or less. When the basis weight is 50 g / m ² or more, the strength of the absorber is further improved. If the basis weight is 600 g / m ² or less, the texture of the absorber becomes better.

The basis weight of the water-absorbent resin powder in the absorbent article is preferably 50 g / m ² or more, more preferably 75 g / m ² or more, still more preferably 100 g / m ² or more, and 800 g / m ² or less. Preferably, it is 700 g / m ² or less, more preferably 600 g / m ² or less. When the basis weight is 50 g / m ² or more, the strength of the absorber is further improved. If the basis weight is 600 g / m ² or less, the texture of the absorber becomes better.

  Next, an aspect of the structure of the absorbent article of the present invention will be described. As a structure of the absorbent article of the present invention, for example, (1) an absorbent body, a top sheet disposed on the skin surface side of the absorbent body, and a back sheet disposed on the non-skin surface side of the absorbent body, A mode in which a fumaric acid-containing sheet is provided between the top sheet and the absorbent body; (2) an absorbent body, a top sheet disposed on the skin surface side of the absorbent body, and the absorbent body An aspect in which the absorbent body is sandwiched with a fumaric acid-containing sheet; and (3) an absorbent body and a top sheet disposed on the skin surface side of the absorbent body. And a back sheet disposed on the non-skin surface side of the absorber, and the absorber is covered with a fumaric acid-containing sheet.

  Next, a specific application example of the absorbent article of the present invention will be described. Examples of the absorbent article of the present invention include absorbent articles used for absorbing bodily fluids discharged from the human body such as incontinence pads, disposable diapers, and sanitary napkins.

  The liquid-permeable top sheet is a non-woven fabric formed of a liquid-permeable sheet material, for example, hydrophilic fiber, and quickly captures the body fluid of the wearer and moves it to the absorbent body. Nonwoven fabrics used as the top sheet are, for example, point bond nonwoven fabrics, air-through nonwoven fabrics, spunlace nonwoven fabrics, and spunbond nonwoven fabrics, and cellulose, rayon, cotton, etc. are usually used as hydrophilic fibers forming these nonwoven fabrics. . In addition, as the top sheet, a liquid-permeable nonwoven fabric formed of hydrophobic fibers (for example, polypropylene, polyethylene, polyester, polyamide, nylon) whose surfaces are hydrophilized with a surfactant may be used.

  As the liquid-impervious sheet used for the back sheet and the side sheet, for example, a water-repellent or liquid-impervious nonwoven fabric formed of hydrophobic fibers (for example, polypropylene, polyethylene, polyester, polyamide, nylon) ( For example, spunbond nonwoven fabrics, meltblown nonwoven fabrics, SMS (spunbond / meltblown / spunbond) nonwoven fabrics) and water-repellent or liquid-impervious plastic films are used, and body fluid that reaches the liquid-impervious sheet is absorbed. Prevent oozing out of the article. When a plastic film is used for the liquid-impermeable sheet, it is preferable to use a plastic film having moisture permeability (breathability) from the viewpoint of preventing stuffiness and improving wearer's comfort. Moreover, you may arrange | position a paper sheet between a plastic film and an absorber for the further diffusibility provision and shape stability.

  When the absorbent article is a disposable diaper, as the disposable diaper, for example, a pair of fastening members are provided on the left and right of the back part or the front part of the abdomen, and the deployable disposable that is formed into a pants shape when worn by the fastening member Diapers (so-called tape-type disposable diapers); pants-type disposable diapers in which a waist opening and a pair of leg openings are formed by joining a front abdomen and a back part; and the like.

  When the absorbent article is a disposable diaper, the disposable diaper forms, for example, a diaper main body in which a laminate composed of an inner sheet and an outer sheet is composed of a front abdomen, a back part, and a crotch part positioned therebetween. The water absorption layer may be disposed in the crotch portion. The disposable diaper is composed of, for example, a laminated body in which an absorbent body is disposed between a top sheet and a back sheet, and this laminated body has a front part, a back part, and a crotch part located between them. You may do it. The front part, the back part, and the crotch part are referred to as the front part of the abdomen when wearing the disposable diaper and the back part as the part of the front part of the abdomen. A portion that is located between the abdomen and the back portion and is placed between the wearer's crotch is referred to as a crotch portion. The inner sheet is preferably hydrophilic or water repellent, and the outer sheet is preferably water repellent.

  The absorbent article is preferably provided with rising flaps along both side edges of the absorbent body. For example, the rising flaps may be provided on both side edges in the width direction of the upper surface of the absorber, or may be provided on both outer sides in the width direction of the absorber. By providing the rising flap, it is possible to prevent side leakage of body fluid. The rising flaps may be formed by raising the inner ends of the side sheets provided on both sides of the top sheet in the width direction. The rising flap and the side sheet are preferably water-repellent.

  Hereinafter, although the absorbent article of this invention is demonstrated, referring a figure, this invention is not limited to the aspect shown by the figure.

  FIG. 1 shows a plan view of an incontinence pad as one embodiment of the absorbent article of the present invention. In FIG. 2, AA sectional drawing of the absorbent article of FIG. 1 is shown. 1 and 2 are defined as the width direction, and the arrow Y is defined as the longitudinal direction. Further, the direction on the surface formed by the arrows X and Y is defined as the plane direction, and the direction of the arrow Z shown in FIG. 2 is defined as the thickness direction.

  The absorbent article 11 includes a liquid-permeable top sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 20 disposed therebetween. The absorbent body 20 is formed by covering the water absorbent resin powder 21 and the fiber base material 22 with the tissue 14. The tissue 14 is composed of the fumaric acid-containing sheet 1.

  The top sheet 12 is disposed so as to face the skin of the wearer's crotch, and allows the wearer's body fluid to pass therethrough. The body fluid that has passed through the top sheet 12 and the tissue 14 is taken into the absorber 20 and absorbed by the water absorbent resin powder 21. Since fumaric acid is sparingly soluble in water, it does not dissolve immediately in body fluids but gradually dissolves. Therefore, even after the absorbent resin powder 21 absorbs body fluid or the like, the tissue 14 and the absorbent body 20 are prevented from becoming alkaline for a long period of time.

  Side sheets 15 extending in the longitudinal direction A of the absorbent article 11 are joined to both side edges in the width direction B of the top sheet 12. The side sheet 15 is composed of a liquid-impermeable plastic film, a water-repellent nonwoven fabric, or the like. The side sheet 15 is provided with a standing elastic member 16 at the inner end in the width direction of the absorbent article 11. When the absorbent article 11 is used, the inner end of the side sheet 15 rises toward the wearer's skin due to the contraction force of the standing elastic member 16, thereby preventing side leakage of body fluid.

  Specific examples of the absorbent article of the present invention include absorbent articles used for absorbing bodily fluids discharged from the human body, such as disposable diapers, sanitary napkins, and incontinence pads.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the following examples, and all modifications and embodiments without departing from the gist of the present invention are not limited thereto. Included in range.

[Evaluation method]
(Measurement method of water absorption rate by vortex method)
A 100 mL glass beaker, 50 mL of physiological saline (0.9% by mass sodium chloride water) and a magnetic stirrer chip (center diameter 8 mm, both ends diameter 7 mm, length 30 mm, surface coated with fluororesin ) And place the beaker on a magnetic stirrer (manufactured by ASONE, “HPS-100”). The rotational speed of the magnetic stirrer is adjusted to 600 ± 60 rpm, and the physiological saline is stirred. 2.0 g of the sample is put into the liquid at the center of the vortex of the saline solution being stirred, and the water absorption rate (seconds) of the water absorbent resin powder is measured according to JIS K 7224 (1996). Specifically, the stopwatch was started when the sample water-absorbent resin powder was completely charged into the beaker, and when the stirrer chip was covered with the test liquid (the vortex disappeared and the liquid surface became flat Stop the stopwatch at the time) and record the time (in seconds) as the water absorption rate. The measurement was performed 5 times (n = 5), the values at each of the upper and lower points were deleted, and the average value of the remaining three points was taken as the measured value. These measurements are performed at 23 ± 2 ° C. and a relative humidity of 50 ± 5%, and are measured after the sample is stored in the same environment for 24 hours or more before the measurement.

(Measurement method of absorption magnification)
The absorption magnification is measured according to JIS K 7223 (1996). Nylon mesh (JIS Z8801-1: 2000) with a mesh size of 63 μm is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half at the center in the longitudinal direction, and both ends are heat sealed to a width of 10 cm (inner dimension: 9 cm), long A 20 cm long nylon bag is prepared. 1.00 g of a measurement sample is precisely weighed and placed uniformly in the bottom of the produced nylon bag. The nylon bag containing the sample is immersed in physiological saline. After 60 minutes from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in the vertical state for 1 hour and drained, and then the mass F1 (g) of the sample is measured. Further, the same operation is performed without using a sample, and the mass F0 (g) at that time is measured. Then, from the masses F1 and F0 and the mass of the sample, a target absorption magnification is calculated according to the following formula.
Absorption capacity (g / g) = (F1-F0) / mass of sample

(Measurement method of water retention)
The water retention amount is measured according to JIS K 7223 (1996). Nylon mesh (JIS Z8801-1: 2000) with a mesh size of 63 μm is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half at the center in the longitudinal direction, and both ends are heat sealed to a width of 10 cm (inner dimension: 9 cm), long A 20 cm long nylon bag is prepared. 1.00 g of a measurement sample is precisely weighed and placed uniformly in the bottom of the produced nylon bag. The nylon bag containing the sample is immersed in physiological saline. After 60 minutes from the start of soaking, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., model H-130C special model). The dehydrating condition is 143 G (800 rpm) for 2 minutes. The mass R1 (g) after dehydration is measured. Further, the same operation is performed without using a sample, and the mass R0 (g) at that time is measured. Then, from these masses R1, R0 and the mass of the sample, the target water retention amount is calculated according to the following equation.
Water retention amount (g / g) = (R1-R0-mass of sample) / mass of sample

(Skin irritation)
20 ml of human urine was absorbed into an absorbent article processed to a width of 10 cm and a length of 10 cm. The absorbent article in which urine was absorbed was placed on the inner crotch of the tester so that the top sheet (liquid permeable nonwoven fabric) was in contact with the skin and left for 16 hours. After the lapse of 16 hours, the absorbent article was removed, and the skin state of the part that had been in contact was visually observed and evaluated in the following three stages. Evaluation was performed by 20 testers, and the average of 20 evaluations was used as the evaluation value of the absorbent article.
(Odor intensity)
Absorbent articles processed to a width of 10 cm and a length of 10 cm were allowed to absorb 20 ml of human urine, and after storing at 35 ° C. for 3 hours, the odor intensity was evaluated by the following four steps by a sensory test. Evaluation was performed by 20 testers, and the average of 20 evaluations was used as the evaluation value of the absorbent article.
<Evaluation criteria for skin irritation>
○: No change.
Δ: Slightly reddish
X: There is redness or rash.
<Evaluation criteria for odor intensity>
A: Odorless.
○: Detectable but weak smell.
Δ: Smell that can be easily detected.
X: It smells strongly.

[Create tissue]
Tissue 1 (Fumaric acid: 1.5 g mass%)
A fumaric acid-containing liquid is prepared by adding fumaric acid (manufactured by Daiichi Seimsha, quick-dissolving 30% fumaric acid formulation “DF-30”) to distilled water at room temperature, and adjusting the fumaric acid concentration to 0.15 mass%. It was. The fumaric acid-containing liquid was applied to the tissue surface by spraying to prepare a tissue. In addition, the application amount of the fumaric acid-containing liquid was adjusted so that the fumaric acid content of the tissue 1 was 1.5 g mass%.

Tissue 2 (fumaric acid: 0.2 g mass%)
Tissue 2 was treated in the same manner as tissue 1 except that the fumaric acid concentration was adjusted to 0.2% by mass, and the amount of the fumaric acid-containing liquid applied was adjusted so that the fumaric acid content was 0.2 g% by mass. Produced.

Tissue 3 (fumaric acid: 0.00015% by mass)
Tissue 3 was treated in the same manner as tissue 1 except that the concentration of fumaric acid was adjusted to 0.015% by mass and the amount of the fumaric acid-containing liquid was adjusted to 0.00015 g% by mass. Produced.

Tissue 4 (Fumaric acid: 0.000015% by mass)
Tissue 4 was treated in the same manner as tissue 1 except that the concentration of fumaric acid was adjusted to 0.0015% by mass and the amount of the fumaric acid-containing solution was adjusted to be 0.000015% by mass. Produced.

Tissue 5 (citric acid: 0.2% by mass)
Tissue 5 was produced in the same manner as tissue 2, except that citric acid was used instead of fumaric acid.

Tissue 6 (malic acid: 0.2% by mass)
Tissue 6 was produced in the same manner as tissue 2, except that malic acid was used instead of fumaric acid.

Tissue 7 (Benzalkonium chloride: 0.2% by mass)
Tissue 7 was prepared in the same manner as tissue 2, except that benzalkonium chloride was used instead of fumaric acid.

Tissue 8 (Polyphenol derived from persimmon astringent: 0.2% by mass)
A tissue 8 was produced in the same manner as the tissue 2 except that a persimmon-derived polyphenol was used instead of fumaric acid.

[Production of absorbent articles]
Absorbent article 1
A synthetic rubber-based hot melt adhesive was applied on the liquid-impermeable sheet, and a tissue 1 was laminated thereon. After applying a synthetic rubber-based hot melt adhesive on the surface of the tissue 1, sprayed with a mixture of pulp and water-absorbent resin powder ("Aqua Pearl (registered trademark)" DS560, manufactured by Sundia Polymer Co., Ltd.) (water-absorbent resin powder) The weight was 100 g / m ² ) to obtain an absorption layer. A synthetic rubber-based hot melt adhesive was applied on the absorbent layer, and a tissue 1 was laminated thereon. A synthetic rubber hot melt adhesive was further applied to the surface of the uppermost tissue 1, a liquid-permeable nonwoven fabric was laminated, and dried at 25 ° C. for 1 week to form an absorbent article 1. The physical properties of the water-absorbent resin powder were a water absorption ratio of 60 g / g, a water retention amount of 42 g / g, and a water absorption rate by a vortex method of 38 seconds.

Absorbent article 2
Absorbent article 2 was produced in the same manner as absorbent article 1, except that tissue 2 was used instead of tissue 1.

Absorbent article 3
Absorbent article 3 was produced in the same manner as absorbent article 1, except that tissue 3 was used instead of tissue 1.

Absorbent article 4
Absorbent article 4 was produced in the same manner as absorbent article 1 except that tissue 4 was used instead of tissue 1.

Absorbent article 5
Absorbent article 5 was produced in the same manner as absorbent article 1, except that tissue 5 was used instead of tissue 1.

Absorbent article 6
Absorbent article 6 was produced in the same manner as absorbent article 1, except that tissue 6 was used instead of tissue 1.

Absorbent article 7
Absorbent article 7 was produced in the same manner as absorbent article 1, except that tissue 7 was used instead of tissue 1.

Absorbent article 8
Absorbent article 8 was produced in the same manner as absorbent article 1 except that tissue 8 was used instead of tissue 1.

Absorbent article 9
Absorbent article 9 was produced in the same manner as absorbent article 1 except that it was dried at 40 ° C. for 1 week instead of being dried at 25 ° C. for 1 week.

Absorbent article 10
Absorbent article 10 was produced in the same manner as absorbent article 2 except that it was dried at 40 ° C. for 1 week instead of being dried at 25 ° C. for 1 week.

Absorbent article 11
Absorbent article 11 was produced in the same manner as absorbent article 3 except that it was dried at 40 ° C. for 1 week instead of being dried at 25 ° C. for 1 week.

Absorbent article 12
An absorbent article 12 was produced in the same manner as the absorbent article 4 except that the film was dried at 40 ° C. for 1 week instead of being dried at 25 ° C. for 1 week.

Absorbent article 13
Absorbent article 13 was produced in the same manner as absorbent article 5, except that the dried article was dried at 40 ° C. for one week instead of being dried at 25 ° C. for one week.

Absorbent article 14
An absorbent article 14 was produced in the same manner as the absorbent article 6 except that it was dried at 40 ° C. for 1 week instead of being dried at 25 ° C. for 1 week.

Absorbent article 15
An absorbent article 15 was produced in the same manner as the absorbent article 1 except that an untreated (non-antibacterial agent) tissue was used instead of the tissue 1.

  About the absorbent articles 1-6 and 9-15 obtained above, the skin irritation test and the odor intensity test were done. The results are shown in Table 1.

  As shown in Table 1, the absorbent articles 1 to 3 in which the fumaric acid-containing sheet was dried at 25 ° C. for 1 week were compared with the absorbent articles 9 to 11 in which the fumaric acid-containing sheet was dried at 40 ° C. for 1 week. The strength was weak. For this reason, when dried at 25 ° C. for 1 week under mild conditions, the fumaric acid crystals in the fumaric acid-containing sheet become denser (stronger). It can be seen that the fumaric acid is less eluted from the fumaric acid-containing sheet as compared with the prepared absorbent article, and as a result, the skin irritation is weak and the antibacterial action (that is, the deodorizing action) is retained.

  In addition, the absorbent articles 5 and 6 using tissues containing citric acid and malic acid, respectively, had stronger skin irritation and odor intensity than when fumaric acid was used. From this, citric acid and malic acid are easily eluted in urine and transferred to the lower absorber, so that in the part that contacts the skin of the wearer, the pH is inclined to the alkaline side with skin irritation, and It can be seen that the antibacterial effect is also weakened.

  Next, for each of the absorbent articles 2, 7, 8, and 15, each absorbent article was produced according to the above-described method, and each absorbent article immediately after production, and one day after production, one week after production, and An odor intensity test was performed using each absorbent article that had passed two weeks after production. The results are shown in Table 2.

  As shown in Table 2, in the absorbent article 13 using benzalkonium chloride other than the acidic compound and the absorbent article 14 using polyphenol, the deodorizing action on the urine of the absorbent article immediately after production and one day after production. Was good. However, the absorbent articles for 1 week and 2 weeks after the production showed the same odor intensity as the absorbent article 15 not using the antibacterial agent. This shows that in the case of an absorbent article prepared using fumaric acid, excellent effects are maintained over a long period of time after the absorbent article is produced in antibacterial action and deodorizing action.

  The present invention can be suitably used for, for example, an absorbent article used to absorb bodily fluids discharged from the human body, and can be particularly suitably used as an absorbent article such as an incontinence pad, a disposable diaper, and a sanitary napkin.

1 Fumaric acid-containing sheet 11 Incontinence pad (absorbent article)
12 Top sheet 13 Back sheet 14 Tissue 15 Side sheet 16 Standing elastic member 20 Absorber 21 Water absorbent resin powder

Claims (6)

Comprising an absorber and a fumaric acid-containing sheet,
The fumaric acid-containing sheet contains fumaric acid in a sheet base material mainly composed of paper,
The content of fumaric acid in the fumaric acid-containing sheet is from 0.00015% by mass to 1.5% by mass,
Absorbent article.   The absorbent article of Claim 1 in which the said fumaric acid is contained over the whole longitudinal direction and the width direction of the said sheet | seat base material.   The absorbent article according to claim 1 or 2, wherein the fumaric acid is contained in a larger amount on the other side than on one side of the sheet base material. A top sheet disposed on the skin surface side of the absorber, and a back sheet disposed on the non-skin surface side of the absorber;
The absorbent article according to any one of claims 1 to 3, wherein the top sheet is the fumaric acid-containing sheet. A top sheet disposed on the skin surface side of the absorber, and a back sheet disposed on the non-skin surface side of the absorber;
The absorptive article according to any one of claims 1 to 4 in which said fumaric acid content sheet is arranged between said absorber and said top sheet. It is a manufacturing method of the absorptive article according to any one of claims 1 to 5,
Including fumaric acid in the sheet base material;
The fumaric acid-containing sheet base material is dried in an air atmosphere for one week or more to obtain a fumaric acid-containing sheet,
Production method.