Deodorant composition

Abstract

The present invention provides a deodorant composition having an excellent deodorizing effect on methyl mercaptan. A deodorant composition containing a porous deodorant containing a halogen and water-absorbent resin particles, the content of the halogen being 0.0030 mass% or more.

Description

Technical Field

[0001] This invention relates to deodorant compositions. Background Technology

[0002] Absorbent products such as diapers, sanitary napkins, and incontinence pads mainly consist of an absorbent core in the center that absorbs and retains bodily fluids such as urine and menstrual blood; a liquid-permeable surface sheet (top sheet) on the side in contact with the body; and a liquid-resistant back sheet (back sheet) on the opposite side. Furthermore, the absorbent core is typically made of hydrophilic fibers such as pulp and absorbent resin.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2001-323155 Summary of the Invention

[0004] The technical problem that the invention aims to solve In absorbent materials, porous deodorizing agents such as activated charcoal are sometimes used to deodorize odors emitted by bodily fluids such as urine.

[0005] In addition, absorbent materials retain not only bodily fluids such as urine, but also feces. The foul odor of methanethiol is produced from feces.

[0006] As deodorants that exhibit excellent deodorizing effects against sulfur compounds such as methanethiol, porous deodorants containing halogens are known. These halogen-containing porous deodorants reduce the odor emanating from sulfur compounds through a reaction between the halogen and the sulfur compound.

[0007] The inventors of this invention investigated the application of halogen-containing porous deodorizers to impart a deodorizing effect of methanethiol to absorbent articles. The results revealed a new problem: while the odor of methanethiol was reduced using halogen-containing porous deodorizers, the deodorizing effect diminished if urine was present alongside the thiol.

[0008] The main objective of this invention is to provide a deodorant composition that has excellent deodorizing effect on methanethiol.

[0009] Technical solutions for solving technical problems The inventors conducted in-depth research to solve the aforementioned problem. The results showed that by using a porous deodorant containing halogens and water-absorbing resin particles in a deodorant composition, and setting the halogen content in the deodorant composition to a predetermined value or higher, excellent deodorizing effects against methanethiol can be achieved. This invention was completed based on further repeated and in-depth research based on this insight.

[0010] That is, the present invention provides an invention having the following structure.

[0011] Item 1. A deodorant composition comprising: a porous deodorant containing halogen, and water-absorbing resin particles. The halogen content is 0.0030% by mass or more.

[0012] Item 2. The deodorant composition according to Item 1, wherein the halogen comprises at least one selected from the group consisting of bromine and chlorine.

[0013] Item 3. The deodorant composition according to item 1 or 2, wherein the porous deodorant comprises at least one compound selected from the group consisting of activated carbon, zeolite, silica and silicates.

[0014] Item 4. The deodorant composition according to any one of items 1 to 3, wherein the ratio of the content Z (mass%) of the water-absorbing resin particles to the sum (X+Y) of the content X (mass%) of the porous deodorant and the content Y (mass%) of the halogen (Z / (X+Y)) is 200 or more.

[0015] Item 5. The deodorant composition according to any one of items 1 to 4, wherein the water-absorbing resin particles absorb water at a rate of less than 50 seconds based on the vortex method.

[0016] Item 6. An absorbent article comprising any one of items 1 to 5 of the deodorant composition.

[0017] Invention Effects According to the present invention, a deodorant composition having excellent deodorizing effect on methanethiol can be provided. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a device for measuring the amount of physiological saline absorbed under a load of 4.14 kPa. Detailed Implementation

[0019] In this specification, "comprising" means "consisting essentially of" and "consisting of". Additionally, in this specification, "(meth)acrylic acid" means "acrylic acid or methacrylic acid", and "(meth)acrylate" means "acrylate or methacrylate". It should be noted that "water solubility" means a solubility of 5% by mass or more in water at 25°C.

[0020] Further, in the present specification, values connected by "~" mean a range of values including values before and after the "~" as lower limit values and upper limit values. In the case where a plurality of lower limit values and a plurality of upper limit values are separately described, any lower limit value and upper limit value can be selected and connected by "~".

[0021] 1. Deodorant composition The present application provides a deodorant composition characterized by comprising: a porous deodorant containing halogen, and water-absorbing resin particles, the content of halogen being 0.0030% by mass or more. The deodorant composition of the present application having this characteristic exerts an excellent deodorizing effect on methyl mercaptan. Hereinafter, the deodorant composition of the present application will be described in detail.

[0022] As described above, the inventors of the present application studied imparting a deodorizing effect on methyl mercaptan to an absorbent article using a porous deodorant containing halogen. However, a new problem was found that, although the odor of methyl mercaptan was reduced by the porous deodorant containing halogen, the deodorizing effect on the odor of methyl mercaptan from feces was attenuated if urine was present together with methyl mercaptan.

[0023] The inventors of the present application further conducted repeated studies, and as a result, found that a polyvalent metal salt (alkali metal, alkaline earth metal) contained in urine reacts with halogen of the porous deodorant, whereby the deodorizing effect of methyl mercaptan is attenuated, and this is the main cause of the problem that methyl mercaptan contained in feces cannot be sufficiently deodorized. Further, the inventors of the present application found that, by using, in combination, a porous deodorant containing halogen and water-absorbing resin particles in a deodorant composition, and setting the content of halogen in the deodorant composition to 0.0030% by mass or more, an excellent deodorizing effect on methyl mercaptan can be exerted. It can be considered that, in the deodorant composition of the present application, the polyvalent metal salt contained in urine is absorbed by the water-absorbing resin particles before coming into contact with halogen molecules of the porous deodorant, whereby the reaction of halogen of the porous deodorant with the polyvalent metal salt is inhibited, and a high deodorizing effect on methyl mercaptan contained in large amounts in feces is exerted.

[0024] (Porous deodorant containing halogen) The porous deodorant containing halogen is a porous deodorant containing a halogen element.

[0025] In the present application, the porous deodorant containing halogen can use a publicly known substance as long as it exerts a deodorizing effect on methyl mercaptan.

[0026] From the viewpoint of appropriately exerting the effects of the present application, in the porous deodorant containing halogen, halogen is preferably contained in the porous deodorant in the form of halogen molecules. In addition, halogen preferably contains at least one selected from the group consisting of bromine and chlorine, and more preferably contains bromine.

[0027] As a preferred specific example of the porous deodorant containing halogen, activated carbon containing bromine can be given. For example, as a porous deodorant having a deodorizing effect of a sulfur compound, bromine-impregnated activated carbon is known, and in the present application, it can also be used as a porous deodorant containing halogen. As the bromine-impregnated activated carbon, for example, a substance described in Japanese Patent Application Laid-Open No. 11-33397 can be given. In the bromine-impregnated activated carbon, a method of impregnating bromine to activated carbon is known, and for example, it can be produced by a gas phase impregnation method in which a carrier gas containing bromine gas is brought into contact with activated carbon subjected to a desired treatment, a liquid phase impregnation method in which the treated activated carbon is impregnated in bromine water, a method of impregnation in which liquid bromine is directly dispersed in the treated activated carbon, or the like.

[0028] In the deodorant composition of the present application, the content of halogen is 0.0030% by mass or more. From the viewpoint of more appropriately exerting the effect of the present application, the content of halogen in the deodorant composition is preferably 0.0035% by mass or more, more preferably 0.0040% by mass or more, further preferably 0.0050% by mass or more, and in addition, it is preferably 0.010% by mass or less, more preferably 0.0080% by mass or less, further preferably 0.0070% by mass or less, and as a preferable range, 0.0030% by mass to 0.010% by mass, 0.0030% by mass to 0.008% by mass, 0.0030% by mass to 0.007% by mass, 0.0035% by mass to 0.010% by mass, 0.0035% by mass to 0.008% by mass, 0.0035% by mass to 0.007% by mass, 0.0040% by mass to 0.010% by mass, 0.0040% by mass to 0.008% by mass, 0.0040% by mass to 0.007% by mass, 0.0050% by mass to 0.010% by mass, 0.0050% by mass to 0.008% by mass, or 0.0050% by mass to 0.007% by mass can be given.

[0029] From the viewpoint of more appropriately exerting the effect of the present application, the porous deodorant can contain at least one selected from the group consisting of activated carbon, zeolite, silicon dioxide, silicate, titanium dioxide, alumina, aluminum hydroxide, and magnesium hydroxide, and can also contain at least one selected from the group consisting of zeolite, activated carbon, and silicon dioxide. The porous deodorant preferably contains at least activated carbon.

[0030] As a source of activated carbon, for example, coconut shell, infusible or carbonized organic material, infusible resin such as phenol resin, and the like can be given. In addition, as an organic material, for example, polyacrylonitrile, pitch, polyvinyl alcohol, cellulose, and the like can be given. Among them, the source of activated carbon is preferably wood (sawdust), coconut shell, pitch (for example, coal tar pitch).

[0031] The median particle diameter of the porous deodorant can be 1 μm to 100 μm, 1 μm to 80 μm, 1 μm to 60 μm, 10 μm to 100 μm, 10 μm to 80 μm, 10 μm to 60 μm, 15 μm to 100 μm, 15 μm to 80 μm, 15 μm to 60 μm, 20 μm to 100 μm, 20 μm to 80 μm, or 20 μm to 60 μm.

[0032] The median particle diameter (D50 (median diameter), volume basis) of the porous deodorant can be measured using a laser diffraction type particle size distribution measuring device, and specifically, is a value measured by the method described in the examples.

[0033] The shape of the porous deodorant is, for example, crushed, cylindrical, or the like, and is preferably crushed.

[0034] The BET specific surface area of the porous deodorant can be 100 m 2 / g to 3000 m 2 / g, 100 m 2 / g to 2500 m 2 / g, 100 m 2 / g to 2000 m 2 / g, 100 m 2 / g to 1500 m 2 / g, 500 m 2 / g to 3000 m 2 / g, 500 m 2 / g to 2500 m 2 / g, 500 m 2 / g to 2000 m 2 / g, 500 m 2 / g to 1500 m 2 / g, 1000 m 2 / g to 3000 m 2 / g, 1000 m 2 / g to 2500 m 2 / g, 1000 m 2 / g to 2000 m 2 / g, or 1000 m 2 / g to 1500 m 2 / g. In the case where the BET specific surface area of the porous deodorant is too large, the pores are miniaturized, whereby the strength of the porous deodorant decreases, and the above-mentioned dust emission degree can increase, and thus the upper limit value of the BET specific surface area is preferably 2000 m 2 / g.

[0035] The BET specific surface area of the porous deodorant can be measured using a specific surface area measuring device.

[0036] The dry content of the porous deodorant can be, for example, 0.1 to 15.0%, 0.1 to 10.0%, 0.1 to 5.0%, 0.5 to 15.0%, 0.5 to 10.0%, 0.5 to 5.0%, 1.0 to 15.0%, 1.0 to 10.0%, or 1.0 to 5.0%.

[0037] Here, the dry content of the porous deodorant refers to a value determined according to JIS K1474:2014.

[0038] In the deodorant composition of the present application, the porous deodorant containing halogen is preferably disposed on the surface of the water-absorbent resin particles (i.e., the porous deodorant is present on the surface of the water-absorbent resin particles). For example, by mixing the water-absorbent resin particles and the porous deodorant containing halogen in a solid state, the porous deodorant containing halogen adheres to the surface of the water-absorbent resin particles, and the porous deodorant containing halogen can be disposed on the surface of the water-absorbent resin particles.

[0039] From the viewpoint of more appropriately exerting the effects of the present application, in the deodorant composition of the present application, the ratio (Z / (X+Y)) of the content rate Z (mass%) of the water-absorbent resin particles with respect to the sum (X+Y) of the content rate X (mass%) of the porous deodorant and the content rate Y (mass%) of halogen is preferably 200 or greater, more preferably 500 or greater, further preferably 950 or greater, and is preferably 2000 or less, more preferably 1500 or less, further preferably 1300 or less, and as a preferable range, 200 to 2000, 200 to 1500, 200 to 1300, 500 to 2000, 500 to 1500, 500 to 1300, 950 to 2000, 950 to 1500, or 950 to 1300 can be given.

[0040] Further, from the viewpoint of more appropriately exerting the effects of the present application, in the deodorant composition of the present application, the sum (X+Y) of the content rate X (mass%) of the porous deodorant and the content rate Y (mass%) of halogen is preferably 0.01 mass% or greater, more preferably 0.05 mass% or greater, further preferably 0.08 mass% or greater, and is preferably 0.30 mass% or less, more preferably 0.20 mass% or less, further preferably 0.15 mass% or less, and as a preferable range, 0.01 mass% to 0.30 mass%, 0.01 mass% to 0.20 mass%, 0.01 mass% to 0.15 mass%, 0.05 mass% to 0.30 mass%, 0.05 mass% to 0.20 mass%, 0.05 mass% to 0.15 mass%, 0.08 mass% to 0.30 mass%, 0.08 mass% to 0.20 mass%, or 0.08 mass% to 0.15 mass% can be given.

[0041] In addition, from the viewpoint of more appropriately exerting the effects of the present application, the content of halogen in the porous deodorant containing halogen is preferably 0.3% by mass or more, more preferably 1.5% by mass or more, further preferably 2.4% by mass or more, and in addition, is preferably 10.0% by mass or less, more preferably 8.0% by mass or less, further preferably 7.0% by mass or less, and as a preferable range, 0.3 to 10% by mass, 0.3 to 8.0% by mass, 0.3 to 7.0% by mass, 1.5 to 10.0% by mass, 1.5 to 8.0% by mass, 1.5 to 7.0% by mass, 2.4 to 10.0% by mass, 2.4 to 8.0% by mass, or 2.4 to 7.0% by mass can be given.

[0042] Next, the water-absorbent resin particles contained in the deodorant composition of the present application are described in detail.

[0043] (Water-absorbent resin particles) The water-absorbent resin particles contained in the deodorant composition of the present application are composed of a substance in which a polymer of a water-soluble ethylenically unsaturated monomer is crosslinked, that is, a crosslinked polymer having a structural unit derived from a water-soluble ethylenically unsaturated monomer.

[0044] The water-absorption speed of the water-absorbent resin particles based on the Vortex method is preferably 50 seconds or less, more preferably 44 seconds or less, further preferably 35 seconds or less, particularly preferably 10 seconds or less, and in addition, as a range of 1 second or more, more preferably 2 seconds or more, 1 to 50 seconds, 1 to 44 seconds, 1 to 35 seconds, 1 to 10 seconds, 2 to 50 seconds, 2 to 44 seconds, 2 to 35 seconds, or 2 to 10 seconds can be given.

[0045] The water-absorption speed of the water-absorbent resin particles based on the Vortex method is a value measured by the method described in the Examples.

[0046] The median particle diameter of the water-absorbent resin particles can be, for example, 150 μm to 850 μm, 150 μm to 600 μm, 150 μm to 550 μm, 150 μm to 500 μm, 150 μm to 450 μm, 150 μm to 400 μm, 200 μm to 850 μm, 200 μm to 600 μm, 200 μm to 550 μm, 200 μm to 500 μm, 200 μm to 450 μm, 200 μm to 400 μm, 240 μm to 850 μm, 240 μm to 600 μm, 240 μm to 550 μm, 240 μm to 500 μm, 240 μm to 450 μm, 240 μm to 400 μm, 260 μm to 850 μm, 260 μm to 600 μm, 260 μm to 550 μm, 260 μm to 500 μm, 260 μm to 450 μm, 260 μm to 400 μm, 280 μm to 850 μm, 280 μm to 600 μm, 280 μm to 550 μm, 280 μm to 500 μm, 280 μm to 450 μm, 280 μm to 400 μm, 300 μm to 850 μm, 300 μm to 600 μm, 300 μm to 550 μm, 300 μm to 500 μm, 300 μm to 450 μm, or 300 μm to 400 μm.

[0047] Note that the water-absorbent resin particles can be in a state in which fine particles (primary particles) are aggregated (secondary particles) in addition to a state in which each of the particles is composed of a single particle. As the shape of the primary particles, there can be mentioned a substantially spherical shape, an irregularly shaped broken shape, a plate shape, and the like. In the case of the primary particles produced by reverse-phase suspension polymerization, there can be mentioned a substantially spherical single particle shape having a smooth surface shape such as a spherical shape, an ellipsoidal shape, and the like.

[0048] The median particle diameter of the water-absorbent resin particles can be measured using a JIS standard sieve, and specifically, is a value measured by the method described in the examples.

[0049] The water-absorbent resin particles have a structural unit derived from a neutral salt of a water-soluble ethylenically unsaturated monomer. As the polymerization method of the water-soluble ethylenically unsaturated monomer, there can be mentioned a water solution polymerization method, an emulsion polymerization method, a reverse-phase suspension polymerization method, and the like, which are representative polymerization methods. In the water solution polymerization method, a water-soluble ethylenically unsaturated monomer aqueous solution is heated with stirring as necessary, whereby polymerization is performed. In the reverse-phase suspension polymerization method, a water-soluble ethylenically unsaturated monomer is heated in a hydrocarbon dispersion medium with stirring, whereby polymerization is performed.

[0050] An example of the production method of the water-absorbent resin particles will be described below.

[0051] As a specific example of the method for producing the water-absorbent resin particles, there can be mentioned a method for producing the water-absorbent resin particles by subjecting a water-soluble ethylenically unsaturated monomer to inverse suspension polymerization in a hydrocarbon dispersion medium, in which the polymerization is carried out in the presence of a radical polymerization initiator, and a step of surface-crosslinking the aqueous gel-like substance obtained by the polymerization in the presence of a surface-crosslinking agent. Note that, in the method for producing the water-absorbent resin particles of the present application, an internal-crosslinking agent can be added to the water-soluble ethylenically unsaturated monomer as needed to form an aqueous gel-like substance having an internal-crosslinking structure.

[0052] <Step of polymerization> [Water-soluble ethylenically unsaturated monomer] As the water-soluble ethylenically unsaturated monomer, there can be mentioned, for example, (meth)acrylic acid (in the present specification, "acrylic acid" and "methacrylic acid" are collectively expressed as "(meth)acrylic acid". The same applies hereinafter) and a salt thereof; 2-(meth)acrylamido-2-methylpropane sulfonic acid and a salt thereof; nonionic monomers such as (meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-hydroxyethyl (meth)acrylate, N-methylol(meth)acrylamide, and polyethylene glycol mono(meth)acrylate; amino-containing unsaturated monomers such as N,N-diethylaminoethyl (meth)acrylate, N,N-diethylaminopropyl (meth)acrylate, and diethylaminopropyl (meth)acrylamide; and quaternary ammonium salts thereof. Of these water-soluble ethylenically unsaturated monomers, (meth)acrylic acid or a salt thereof, (meth)acrylamide, and N,N-dimethylacrylamide are preferred from the viewpoint of easy availability in industry, and (meth)acrylic acid and a salt thereof are more preferred. Note that, these water-soluble ethylenically unsaturated monomers can be used alone or in combination of two or more.

[0053] Of these, acrylic acid and a salt thereof are widely used as a raw material for the water-absorbent resin particles, and in some cases, acrylic acid and / or a salt thereof is used in copolymerization with the above-described other water-soluble ethylenically unsaturated monomers. At this time, acrylic acid and / or a salt thereof is preferably used as a main water-soluble ethylenically unsaturated monomer at 70 to 100 mol% relative to the total water-soluble ethylenically unsaturated monomers.

[0054] The water-soluble ethylenically unsaturated monomer can be dispersed in the hydrocarbon dispersion medium in the form of an aqueous solution for the reverse-phase suspension polymerization. The water-soluble ethylenically unsaturated monomer can improve the dispersion efficiency in the hydrocarbon dispersion medium by forming an aqueous solution. As the concentration of the water-soluble ethylenically unsaturated monomer in the aqueous solution, it is preferable to be in the range of 20 mass% or less than the saturated concentration. In addition, as the concentration of the water-soluble ethylenically unsaturated monomer, it is more preferable to be 55 mass% or less, further preferable to be 50 mass% or less, and still further preferable to be 45 mass% or less. On the other hand, as the concentration of the water-soluble ethylenically unsaturated monomer, it is more preferable to be 25 mass% or more, further preferable to be 28 mass% or more, and still further preferable to be 30 mass% or more.

[0055] In the case where the water-soluble ethylenically unsaturated monomer has an acid group such as (meth)acrylic acid, 2-(meth)acrylamido-2-methylpropane sulfonic acid, and the like, a substance in which the acid group is neutralized in advance with a basic neutralizing agent can also be used as needed. As such a basic neutralizing agent, alkali metal salts such as sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate, and the like; ammonia; and the like can be given. In addition, in order to simplify the neutralization operation, these basic neutralizing agents can be used in the form of an aqueous solution. Note that the above basic neutralizing agents can be used alone or in combination with two or more.

[0056] As the degree of neutralization of the water-soluble ethylenically unsaturated monomer with the basic neutralizing agent, it is preferable to be 10 to 100 mol% with respect to the total acid group possessed by the water-soluble ethylenically unsaturated monomer, more preferable to be 30 to 90 mol%, further preferable to be 40 to 85 mol%, and still further preferable to be 50 to 80 mol%.

[0057] [Radical polymerization initiator] As the free radical polymerization initiator to be added in the polymerization step, for example, there can be mentioned potassium persulfate, ammonium persulfate, sodium persulfate, and the like, peroxides such as methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, t-butyl peroxyacetate, t-butyl peroxyisobutyrate, t-butyl peroxyneopentanoate, hydrogen peroxide, and the like, and azo compounds such as 2,2'-azobis(2-amidinopropane) dihydrochloride, 2,2'-azobis[2-(N-phenylamidinopropane] dihydrochloride, 2,2'-azobis[2-(N-allylamidinopropane] dihydrochloride, 2,2'-azobis{2-[l-(2-hydroxyethyl)-2-imidazolin-2-yl]propane} dihydrochloride, 2,2'-azobis{2-methyl-N-[l,l-bis(hydroxymethyl)-2-hydroxyethyl]propionamide}, 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide], 4,4'-azobis(4-cyanopentanoic acid), and the like. Of these free radical polymerization initiators, from the viewpoint of easy availability and easy handling, there can be preferably mentioned potassium persulfate, ammonium persulfate, sodium persulfate, and 2,2'-azobis(2-amidinopropane) dihydrochloride. These free radical polymerization initiators can be used alone or in combination of two or more. In addition, the above-mentioned free radical polymerization initiators can be used in combination with reducing agents such as sodium sulfite, sodium bisulfite, ferrous sulfate, and L-ascorbic acid, as redox polymerization initiators.

[0058] As the amount of use of the free radical polymerization initiator, for example, there can be mentioned 0.00005 to 0.01 mole per 1 mole of the water-soluble ethylenically unsaturated monomer. By satisfying this amount of use, it is possible to avoid occurrence of a violent polymerization reaction and to complete the polymerization reaction within an appropriate time.

[0059] [Internal crosslinking agent] As the internal crosslinking agent, a crosslinking agent capable of crosslinking a polymer of a water-soluble ethylenically unsaturated monomer used can be mentioned, for example, unsaturated polyesters obtained by reacting a dihydric alcohol, a trihydric alcohol or the like polyhydric alcohol such as (poly)ethylene glycol ["poly" indicates the case with the prefix "poly" and the case without the prefix "poly". The same applies hereinafter], (poly)propylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, (poly)glycerol or the like with an unsaturated acid such as (meth)acrylic acid, maleic acid, fumaric acid; bisacrylamides such as N,N-methylenebisacrylamide; di(meth)acrylates or tri(meth)acrylates obtained by reacting a polyepoxide with (meth)acrylic acid; carbamoyl di(meth)acrylates obtained by reacting a polyisocyanate such as toluene diisocyanate, hexamethylene diisocyanate with hydroxyethyl (meth)acrylate; compounds having two or more polymerizable unsaturated groups such as allylated starch, allylated cellulose, diallyl phthalate, N,N',N"-triallylisocyanurate, divinylbenzene; diglycidyl compounds such as (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, (poly)glycerol diglycidyl ether, polyglycidyl compounds such as triglycidyl compounds; epihalohydrin compounds such as epichlorohydrin, epibromohydrin, a-methyl epichlorohydrin; isocyanate compounds such as 2,4-toluene diisocyanate, hexamethylene diisocyanate; and the like compounds having two or more reactive functional groups; oxetane compounds such as 3-methyl-3-hydroxymethyloxetane, 3-ethyl-3-hydroxymethyloxetane, 3-butyl-3-hydroxymethyloxetane, 3-methyl-3-hydroxyethyloxetane, 3-ethyl-3-hydroxyethyloxetane, 3-butyl-3-hydroxyethyloxetane, and the like. Of these internal crosslinking agents, polyglycidyl compounds are preferred, diglycidyl ether compounds are more preferred, and (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, (poly)glycerol diglycidyl ether are particularly preferred. These internal crosslinking agents can be used alone or in combination of two or more.

[0060] The internal crosslinking agent is preferably used in an amount of 0.000001 to 0.02 mol, more preferably 0.00001 to 0.01 mol, further preferably 0.00001 to 0.005 mol, and more further preferably 0.00005 to 0.002 mol, per 1 mol of the water-soluble ethylenically unsaturated monomer.

[0061] [Hydrocarbon Dispersion Medium] As the hydrocarbon dispersion medium, for example, aliphatic hydrocarbons having 6 to 8 carbon atoms such as n-hexane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 3-ethylpentane, n-octane, alicyclic hydrocarbons such as cyclohexane, methylcyclohexane, cyclopentane, methylcyclopentane, trans-1,2-dimethylcyclopentane, cis-1,3-dimethylcyclopentane, trans-1,3-dimethylcyclopentane, aromatic hydrocarbons such as benzene, toluene, xylene, and the like can be mentioned. Among these hydrocarbon dispersion media, n-hexane, n-heptane, cyclohexane are particularly preferable from the viewpoint of being easily available industrially, stable in quality, and inexpensive. These hydrocarbon dispersion media can be used alone or in combination of two or more. Note that as an example of a mixture of hydrocarbon dispersion media, Exxsol heptane (manufactured by Exxon Mobil Corporation: hydrocarbons containing heptane and isomers thereof at 75 to 85% by mass) and the like commercially available can also give a suitable result.

[0062] The amount of use of the hydrocarbon dispersion medium is preferably 100 to 1500 parts by mass, more preferably 200 to 1400 parts by mass, relative to 100 parts by mass of the water-soluble ethylenically unsaturated monomer of the first stage, from the viewpoint of uniformly dispersing the water-soluble ethylenically unsaturated monomer and easily controlling the polymerization temperature. Note that, as described later, the reverse-phase suspension polymerization is performed in one stage (single stage) or in two or more stages, and the above-mentioned polymerization of the first stage refers to the polymerization reaction of the first stage in the single stage polymerization or the multi-stage polymerization (the same also applies hereinafter).

[0063] [Dispersing stabilizer] (Surfactant) In the reverse-phase suspension polymerization, a dispersing stabilizer can also be used in order to improve the dispersion stability of the water-soluble ethylenically unsaturated monomer in the hydrocarbon dispersion medium. As the dispersing stabilizer, a surfactant can be used.

[0064] As the surfactant, for example, sucrose fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitol fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkyl allyl formaldehyde condensation polyoxyethylene ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyethylene polyoxypropylene alkyl ether, polyethylene glycol fatty acid ester, alkyl glucoside, N-alkyl glucamide, polyoxyethylene fatty acid amide, polyoxyethylene alkyl amine, phosphate ester of polyoxyethylene alkyl ether, phosphate ester of polyoxyethylene alkyl allyl ether, and the like can be mentioned. Among these surfactants, from the viewpoint of the dispersion stability of the monomer, sucrose fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester are particularly preferable. These surfactants can be used alone or in combination of two or more.

[0065] The amount of surfactant used is preferably 0.1 to 30 parts by mass relative to 100 parts by mass of the water-soluble olefinic unsaturated monomer in the first stage, and more preferably 0.3 to 20 parts by mass.

[0066] (Polymer dispersant) In addition, as a dispersant stabilizer used in reverse suspension polymerization, it can be used together with the above-mentioned surfactant and a polymeric dispersant.

[0067] Examples of polymeric dispersants include, for instance, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene-propylene copolymer, maleic anhydride-modified EPDM (ethylene-propylene-diene terpolymer), maleic anhydride-modified polybutadiene, maleic anhydride-ethylene copolymer, maleic anhydride-propylene copolymer, maleic anhydride-ethylene-propylene copolymer, maleic anhydride-butadiene copolymer, polyethylene, polypropylene, ethylene-propylene copolymer, oxidized polyethylene, oxidized polypropylene, oxidized ethylene-propylene copolymer, ethylene-acrylic acid copolymer, ethyl cellulose, and ethyl hydroxyethyl cellulose. Among these polymeric dispersants, from the perspective of monomer dispersion stability, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-ethylene copolymer, maleic anhydride-propylene copolymer, maleic anhydride-ethylene-propylene copolymer, polyethylene, polypropylene, ethylene-propylene copolymer, oxidized polyethylene, oxidized polypropylene, and oxidized ethylene-propylene copolymer are particularly preferred. These polymeric dispersants can be used alone or in combination of two or more.

[0068] The amount of polymeric dispersant used is preferably 0.1 to 30 parts by mass relative to 100 parts by mass of the water-soluble olefinic unsaturated monomer in the first stage, and more preferably 0.3 to 20 parts by mass.

[0069] [Other ingredients] In the manufacturing method of water-absorbent resin particles, other components can be added to an aqueous solution containing water-soluble olefinically unsaturated monomers as needed to carry out reverse-phase suspension polymerization. Various additives such as thickeners and chain transfer agents can be added as these other components.

[0070] As an example, a thickener can be added to an aqueous solution containing a water-soluble olefinically unsaturated monomer to induce reverse suspension polymerization. By adding a thickener in this way and adjusting the viscosity of the aqueous solution, the median particle size obtained in the reverse suspension polymerization can be controlled.

[0071] As the thickening agent, for example, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyacrylic acid, a (partly) neutralized product of polyacrylic acid, polyethylene glycol, polyacrylamide, polyethylene imine, dextrin, sodium alginate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, and the like can be used. Note that if the stirring speed at the time of polymerization is the same, there is a tendency that the higher the viscosity of the aqueous solution of the water-soluble ethylenically unsaturated monomer, the larger the primary particles and / or secondary particles of the obtained particles.

[0072] [Reverse suspension polymerization] In the reverse suspension polymerization, for example, an aqueous monomer solution containing a water-soluble ethylenically unsaturated monomer is dispersed in a hydrocarbon dispersion medium in the presence of a dispersion stabilizer. At this time, if it is before the start of the polymerization reaction, the timing of the addition of the dispersion stabilizer (surfactant, high-molecular-weight dispersant) can be either before or after the addition of the aqueous monomer solution.

[0073] Among them, from the viewpoint of easily reducing the amount of the hydrocarbon dispersion medium remaining in the obtained water-absorbent resin particles, it is preferable to further disperse a surfactant after the aqueous monomer solution is dispersed in the hydrocarbon dispersion medium in which the high-molecular-weight dispersant is dispersed, and then to perform the polymerization.

[0074] The polymerization step can be performed in one stage or in two or more stages.

[0075] When the reverse suspension polymerization is performed in two or more stages, after the first-stage reverse suspension polymerization is performed, an aqueous solution of a water-soluble ethylenically unsaturated monomer is added to the reaction mixture obtained by the first-stage polymerization reaction and mixed, and the reverse suspension polymerization from the second stage onward is performed in the same manner as the first stage. In the reverse suspension polymerization in each stage from the second stage onward, in addition to the ethylenically unsaturated monomer, the above-described radical polymerization initiator and / or various additives can be added and the reverse suspension polymerization can be performed; as for the amounts of the above-described radical polymerization initiator and / or various additives to be added, the amounts of the ethylenically unsaturated monomer to be added at the time of the reverse suspension polymerization in each stage from the second stage onward are taken as the basis, and the above-described components are added within the ranges of the ratios thereof with respect to the ethylenically unsaturated monomer.

[0076] [Particle diameter adjustment step] The method for producing the water-absorbent resin particles of the present application can have a particle diameter adjustment step. The particle diameter adjustment step can be performed, for example, by adding a coagulant such as a powdered inorganic coagulant to the system.

[0077] As examples of the inorganic coagulant in powder form, mention can be made of amorphous silica, zeolite, bentonite, alumina, talc, titanium dioxide, kaolin, clay, hydrotalcite, and the like. Among these, at least one selected from the group consisting of amorphous silica, alumina, talc, and kaolin can be used because of high coagulation effect.

[0078] In the case where the coagulant is added in the system, the timing of the addition is, for example, between the above-mentioned polymerization step and the below-mentioned drying step and / or between the below-mentioned surface crosslinking step.

[0079] The amount of the coagulant to be added can be 0.001 to 1 parts by mass, 0.005 to 0.5 parts by mass, or 0.01 to 0.2 parts by mass, relative to 100 parts by mass of the water-soluble ethylenically unsaturated monomer.

[0080] The reaction temperature of the polymerization is preferably 20 to 110°C, more preferably 40 to 90°C, from the viewpoint of making the polymerization proceed rapidly, shortening the polymerization time, thereby improving the economy, and easily removing the polymerization heat to make the reaction proceed smoothly.

[0081] <surface crosslinking step> Next, the water-absorbent resin particles of the present application are obtained by adding a surface crosslinking agent to the water-containing gel-like polymer having an internal crosslinking structure obtained by polymerizing the water-soluble ethylenically unsaturated monomer, and performing crosslinking (surface crosslinking reaction). The surface crosslinking reaction is preferably performed in the presence of the surface crosslinking agent after the polymerization of the water-soluble ethylenically unsaturated monomer. In this way, by performing the surface crosslinking reaction on the water-containing gel-like polymer having the internal crosslinking structure after the polymerization, it is possible to increase the crosslinking density in the vicinity of the surface of the water-absorbent resin particles, and obtain water-absorbent resin particles having improved properties such as water-absorbing capacity under load.

[0082] As the surface crosslinking agent, a compound having two or more reactive functional groups can be given. For example, polyhydric alcohols such as ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, triethylene glycol, trimethylolpropane, glycerol, polyoxyethylene glycol, polyoxypropylene glycol, and polyglycerol; polyglycidyl compounds such as (poly)ethylene glycol diglycidyl ether, (poly)glycerol diglycidyl ether, (poly)glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, and (poly)glycerol polyglycidyl ether; halogenated epoxy compounds such as epichlorohydrin, epibromohydrin, and a-methyl epichlorohydrin; isocyanate compounds such as 2,4-tolylene diisocyanate and hexamethylene diisocyanate; oxetane compounds such as 3-methyl-3-hydroxymethyloxetane, 3-ethyl-3-hydroxymethyloxetane, 3-butyl-3-hydroxymethyloxetane, 3-methyl-3-hydroxyethyloxetane, 3-ethyl-3-hydroxyethyloxetane, and 3-butyl-3-hydroxyethyloxetane; oxazoline compounds such as 1,2-ethylene bisoxazoline; carbonate compounds (e.g., alkylene carbonate) such as ethylene carbonate, propylene carbonate, 4,5-dimethyl-l,3-dioxolan-2-one, 4,4-dimethyl-l,3-dioxolan-2-one, 4-ethyl-l,3-dioxolan-2-one, 4-hydroxymethyl-l,3-dioxolan-2-one, 1,3-dioxan-2-one, 4-methyl-l,3-dioxan-2-one, 4,6-dimethyl-l,3-dioxan-2-one, and 1,3-dioxolan-2-one; and hydroxyalkylamide compounds such as bis[N,N-di(β-hydroxyethyl)]adipamide can be given. Of these surface crosslinking agents, polyglycidyl compounds such as (poly)ethylene glycol diglycidyl ether, (poly)glycerol diglycidyl ether, (poly)glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, and (poly)glycerol polyglycidyl ether are preferred. These surface crosslinking agents can be used alone or in combination of two or more.

[0083] The amount of the surface crosslinking agent used is preferably 0.00001 to 0.01 mol, more preferably 0.00005 to 0.005 mol, and further preferably 0.0001 to 0.002 mol, relative to 1 mol of the total amount of the water-soluble ethylenically unsaturated monomer used in the polymerization.

[0084] As the method of adding the surface crosslinking agent, the surface crosslinking agent can be added as it is or in an aqueous solution, or can be added as a solution in which a hydrophilic organic solvent is used as a solvent, as needed. As the hydrophilic organic solvent, for example, lower alcohols such as methanol, ethanol, n-propanol, and isopropanol; ketones such as acetone and methyl ethyl ketone; ethers such as diethyl ether, dioxane, and tetrahydrofuran; amides such as N,N-dimethylformamide; and sulfoxides such as dimethyl sulfoxide can be given. These hydrophilic organic solvents can be used alone, or two or more of them can be used in combination, or can be used as a mixed solvent with water.

[0085] As the timing of adding the surface crosslinking agent, it is only necessary that the polymerization of the water-soluble ethylenically unsaturated monomer be almost completed, and it is preferable to add the surface crosslinking agent in the presence of water in an amount of 1 to 400 parts by mass, more preferably in the presence of water in an amount of 5 to 200 parts by mass, further preferably in the presence of water in an amount of 10 to 100 parts by mass, and still further preferably in the presence of water in an amount of 20 to 60 parts by mass, with respect to 100 parts by mass of the water-soluble ethylenically unsaturated monomer. Note that the amount of water refers to the total amount of water contained in the reaction system and water used as needed at the time of adding the surface crosslinking agent.

[0086] As the reaction temperature in the surface crosslinking reaction, it is preferable to be in the range of 50 to 250°C, more preferable to be in the range of 60 to 180°C, further preferable to be in the range of 60 to 140°C, and still further preferable to be in the range of 70 to 120°C. In addition, as the reaction time of the surface crosslinking reaction, it is preferable to be in the range of 1 to 300 minutes, and more preferable to be in the range of 5 to 200 minutes.

[0087] < Drying Step > After the above reverse-phase suspension polymerization, a drying step in which water, a hydrocarbon dispersion medium, or the like is removed by externally applying energy such as heat can be included. In the case where dehydration is performed from the water-containing gel-like polymer after the reverse-phase suspension polymerization, the system in which the water-containing gel-like polymer is dispersed in the hydrocarbon dispersion medium is heated, whereby water and the hydrocarbon dispersion medium are temporarily distilled and removed from the system by azeotropic distillation. At this time, if only the hydrocarbon dispersion medium distilled and removed is returned to the system, continuous azeotropic distillation can be performed. In this case, the temperature in the system during drying is maintained below the temperature at which the hydrocarbon dispersion medium azeotropes, and thus is preferable from the viewpoint that resin degradation or the like is less likely to occur. Subsequently, water and the hydrocarbon dispersion medium are removed by distillation, and a water-absorbent resin particle is obtained. By adjusting the amount of dehydration by controlling the treatment conditions of this post-polymerization drying step, each property of the obtained water-absorbent resin particle can be controlled.

[0088] In the drying step, the drying treatment by distillation can be performed under normal pressure or under reduced pressure. In addition, from the viewpoint of improving the drying efficiency, it can also be performed under a stream of nitrogen or the like. In the case where the drying treatment is performed under normal pressure, the drying temperature is preferably from 70°C to 250°C, more preferably from 80°C to 180°C, further preferably from 80°C to 140°C, and still further preferably from 90°C to 130°C. In the case where the drying treatment is performed under reduced pressure, the drying temperature is preferably from 40°C to 160°C, and more preferably from 50°C to 110°C.

[0089] Note that, in the case where the surface crosslinking step using a surface crosslinking agent is performed after the polymerization of the monomers by the inverse suspension polymerization, the above-described drying step using distillation is performed after the surface crosslinking step is completed. Alternatively, the surface crosslinking step and the drying step can also be performed simultaneously.

[0090] The deodorant composition of the present application can contain an additive as appropriate. As such an additive, inorganic powder, surfactant, oxidizing agent, reducing agent, metal chelating agent, radical chain inhibitor, antioxidant, antibacterial agent, and the like can be given. For example, by adding 0.05 to 5 parts by mass of amorphous silicon dioxide as an inorganic powder with respect to 100 parts by mass of the water-absorbent resin particles, the flowability of the deodorant composition can be further improved. Note that the above-described additive is preferably hydrophilic or water-soluble.

[0091] In addition, from the viewpoint of more appropriately exerting the effects of the present application, in the deodorant composition of the present application, the content rate Z (mass %) of the water-absorbent resin particles is preferably 95.00 mass % or more, more preferably 98.00 mass % or more, further preferably 99.00 mass % or more, and in addition, is preferably 99.99 mass % or less, more preferably 99.98 mass % or less, and further preferably 99.97 mass % or less, and as a preferable range, 95.00 to 99.99 mass %, and the like can be given.

[0092] The deodorant composition of the present application can be manufactured, for example, by mixing the water-absorbent resin particles and the porous deodorant containing halogen in a solid state.

[0093] The deodorant composition of the present application can be used for a wide range of deodorizing purposes, and since it contains water-absorbent resin particles, it is particularly suitable for deodorizing purposes that require water absorbency. As described later, the deodorant composition of the present application can be suitably used, for example, for absorbents used in sanitary materials such as paper diapers.

[0094] 2. Absorbent, Absorbent Article The deodorant composition of the present application can be used, for example, in an absorbent used in sanitary materials such as a diaper. In the case where the content rate Z of the water-absorbent resin particles in the deodorant composition of the present application is high (for example, in the case where the content rate Z (mass %) of the water-absorbent resin particles in the deodorant composition of the present application is 95.00 mass % or more), the deodorant composition of the present application can be used as a water-absorbent resin composition in an absorbent. The absorbent can be used, for example, in an absorbent article including the absorbent. In this case, the absorbent article of the present application includes the deodorant composition of the present application.

[0095] Here, the absorbent using the deodorant composition of the present application includes the deodorant composition of the present application. The absorbent can further include a hydrophilic fiber. As a configuration of the absorbent, a sheet-like structure in which water-absorbent resin particles are fixed to a nonwoven fabric or between a plurality of nonwoven fabrics, a mixed dispersion obtained by mixing the deodorant composition and the hydrophilic fiber in a manner that they become a uniform composition, a sandwich structure in which the deodorant composition is sandwiched between layered hydrophilic fibers, a structure in which the deodorant composition and the hydrophilic fiber are wrapped with a paper towel, and the like can be given. Note that other components can be incorporated in the absorbent, such as a heat-fusible synthetic fiber, a heat-fusible adhesive, an adhesive emulsion, and the like, which are used to improve the shape retention performance of the absorbent.

[0096] The content rate of the deodorant composition in the absorbent is preferably 5 to 100 mass %, more preferably 10 to 95 mass %, further preferably 20 to 90 mass %, and more further preferably 30 to 80 mass %.

[0097] As the hydrophilic fiber, cellulose fibers such as cotton-like pulp, mechanical pulp, chemical pulp, and semi-chemical pulp obtained from wood, artificial cellulose fibers such as rayon and cellulose acetate, and fibers including synthetic resins such as polyamide, polyester, and polyolefin subjected to hydrophilization treatment can be given. The average fiber length of the hydrophilic fiber is usually 0.1 mm to 10 mm, or 0.5 mm to 5 mm.

[0098] The absorbent article of the present application can be produced by holding the absorbent using the deodorant composition of the present application between a liquid-permeable sheet (top sheet) through which a liquid can pass and a liquid-impermeable sheet (back sheet) through which a liquid cannot pass. The liquid-permeable sheet is disposed on the side that comes into contact with the body, and the liquid-impermeable sheet is disposed on the side opposite to the side that comes into contact with the body.

[0099] As the liquid-permeable sheet, a nonwoven fabric such as a thermal air type, a spun-bond type, a chemical bonding type, and a needle punch type including fibers of polyethylene, polypropylene, polyester, and the like, and a porous synthetic resin sheet can be given. In addition, as the liquid-impermeable sheet, a synthetic resin film including resins such as polyethylene, polypropylene, and polyvinyl chloride can be given.

[0100] 3. Supplementary notes The present specification contains at least the following (1) to (8) indicated inventions.

[0101] (1) A deodorant composition comprising: a porous deodorant containing halogen, and a water-absorbing resin particle, the content of the halogen being 0.0030 mass% or more.

[0102] (2) The deodorant composition according to the above (1), wherein the content of the halogen is 0.0030 mass% to 0.010 mass%, 0.0030 mass% to 0.008 mass%, 0.0030 mass% to 0.007 mass%, 0.0035 mass% to 0.010 mass%, 0.0035 mass% to 0.008 mass%, 0.0035 mass% to 0.007 mass%, 0.0040 mass% to 0.010 mass%, 0.0040 mass% to 0.008 mass%, 0.0040 mass% to 0.007 mass%, 0.0050 mass% to 0.010 mass%, 0.0050 mass% to 0.008 mass%, or 0.0050 mass% to 0.007 mass%.

[0103] (3) The deodorant composition according to the above (1) or (2), wherein the halogen contains at least one selected from the group consisting of bromine and chlorine.

[0104] (4) The deodorant composition according to any one of the above (1) to (3), wherein the porous deodorant contains at least one compound selected from the group consisting of activated carbon, silicon dioxide, and silicate.

[0105] (5) The deodorant composition according to any one of the above (1) to (4), wherein the ratio (Z / (X+Y)) of the content Z (mass%) of the water-absorbing resin particle with respect to the sum (X+Y) of the content X (mass%) of the porous deodorant and the content Y (mass%) of the halogen is 200 to 2000, 200 to 1500, 200 to 1300, 500 to 2000, 500 to 1500, 500 to 1300, 950 to 2000, 950 to 1500, or 950 to 1300.

[0106] (6) The deodorant composition according to any one of the above (1) to (5), wherein the sum (X+Y) of the content rate X (mass%) of the porous deodorant and the content mass% Y (mass%) of the halogen is 0.01 mass% to 0.30 mass%, 0.01 mass% to 0.20 mass%, 0.01 mass% to 0.15 mass%, 0.05 mass% to 0.30 mass%, 0.05 mass% to 0.2 mass%, 0.05 mass% to 0.15 mass%, 0.08 mass% to 0.30 mass%, 0.08 mass% to 0.20 mass%, or 0.08 mass% to 0.15 mass%.

[0107] (7) The deodorant composition according to any one of the above (1) to (6), wherein the water-absorbing speed of the water-absorbing resin particles based on the vortex method is 1 second to 50 seconds, 1 second to 44 seconds, 1 second to 35 seconds, 1 second to 10 seconds, 2 seconds to 50 seconds, 2 seconds to 44 seconds, 2 seconds to 35 seconds, or 2 seconds to 10 seconds.

[0108] (8) The deodorant composition according to any one of the above (1) to (7), wherein the porous deodorant contains halogen, and the content rate of the halogen in the porous deodorant containing halogen is 0.3 mass% to 10.0 mass%, 0.3 mass% to 8.0 mass%, 0.3 mass% to 7.0 mass%, 1.5 mass% to 10.0 mass%, 1.5 mass% to 8.0 mass%, 1.5 mass% to 7.0 mass%, 2.4 mass% to 10.0 mass%, 2.4 mass% to 8.0 mass%, or 2.4 mass% to 7.0 mass%.

[0109] Examples Hereinafter, examples and comparative examples are shown, and the present application is explained in detail. However, the present application is not limited to the examples.

[0110] Note that the following water-absorbing resin particles, activated carbon as the porous deodorant, and the deodorant compositions obtained in the examples and comparative examples are evaluated by the following various tests. Note that, in the case where not particularly mentioned, the measurement is performed in an environment at a temperature of 25 ± 2°C and a humidity of 50 ± 10%.

[0111] [Manufacturing Example of Water-Absorbing Resin Particles] <Manufacturing Example 1> A separable flask of a cylindrical shape with a round bottom and a capacity of 2 L and an inner diameter of 110 mm, which was provided with 4 baffle plates on the side wall, was prepared, which was provided with a reflux condenser, a dropping funnel, a nitrogen gas introducing tube, and a stirrer. A stirring blade having 4 inclined blades with a wing width of 50 mm and a wing diameter of 50 mm, which were surface-treated with a fluorine resin, was installed on the stirrer. In the prepared separable flask, 451.4 g of n-heptane and 1.288 g of sorbitan monolaurate (trade name: NONION LP-20R, HLB value: 8.6, manufactured by Nippon Oil & Fats Corporation) were mixed. While the mixture in the separable flask was stirred with the stirrer, the temperature was increased to 50°C, whereby the sorbitan monolaurate was dissolved in the n-heptane. The resulting solution was cooled to 40°C.

[0112] In a 500 mL triangular flask, 92.0 g of an 80.5 mass% aqueous solution of acrylic acid (acrylic acid: 1.03 moles) was added. While ice-cooling was performed from the outside, 147.7 g of a 20.9 mass% aqueous solution of sodium hydroxide was added dropwise to the aqueous solution of acrylic acid in the flask, and the acrylic acid was partially neutralized. Subsequently, 0.1011 g (0.374 millimoles) of potassium persulfate as a water-soluble radical polymerization initiator was added, and they were dissolved in the aqueous solution, and an aqueous solution was prepared.

[0113] The obtained aqueous solution was added to the above-described separable flask containing the solution of sorbitan monolaurate, and the inside of the system was sufficiently replaced with nitrogen gas. While the rotation speed of the stirrer was set to 700 rpm and stirring was performed, the reaction solution in the separable flask was maintained in a 70°C warm water bath for 60 minutes, and thus a polymerization reaction was performed.

[0114] In the reaction solution containing the hydrogel-like polymer generated by the polymerization reaction, a dispersion liquid in which 0.092 g of amorphous silica (Oriental Silicas Corporation, TOKUSIL NP-S) was dispersed in 100 g of n-heptane was added, and the reaction solution was stirred for 10 minutes. The separable flask was immersed in an oil bath at 125°C, and 98.5 g of water was removed to the outside of the system by azeotropic distillation. Then, 4.14 g (glycol diglycidyl ether: 0.475 millimoles) of a 2 mass% aqueous solution of glycol diglycidyl ether as a surface crosslinking agent was added, and a surface crosslinking reaction was performed at an inner temperature of 80 ± 2°C for 2 hours.

[0115] The reaction solution was heated to 125°C to evaporate water and n-heptane, and a dried product of the water-absorbent resin particles was obtained. The dried product was passed through a sieve with a mesh size of 850 μm, and 86.3 g of water-absorbent resin particles were obtained. The saline water retention of the water-absorbent resin particles was 37 g / g, the water absorption speed was 3 seconds, the median particle diameter was 361 μm, and the saline water absorption under a load of 4.14 kPa was 11 ml / g.

[0116] <Manufacturing Example 2> A 2L round-bottom cylindrical separable flask equipped with a reflux condenser, a dropping funnel, a nitrogen inlet tube, and a stirrer having four inclined blades with a 2-stage blade diameter of 5 cm was prepared. In the flask, 293 g of n-heptane was taken as a hydrocarbon dispersion medium, and 0.736 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., HI-WAX 1105A) was added as a polymeric dispersant. While stirring, the temperature was increased to 80°C, and the dispersant was dissolved. After cooling to 50°C, 92.0 g (1.03 moles) of an 80.5 mass% aqueous acrylic acid solution was taken as a water-soluble ethylenically unsaturated monomer in a beaker with a capacity of 300 mL. While being cooled with ice water, 147.7 g of a 20.9 mass% aqueous sodium hydroxide solution was added dropwise to perform 75 mole% neutralization. Then, 0.092 g of hydroxyethyl cellulose (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) was added as a thickening agent, 0.0736 g of potassium persulfate (0.272 μmoles) was added as a water-soluble radical polymerization initiator, and 0.010 g of ethylene glycol diglycidyl ether (0.057 μmoles) was added as an internal crosslinking agent, and dissolved to prepare a first-stage aqueous solution. Then, the above-prepared aqueous solution was added to the separable flask, and stirred for 10 minutes. In a 20 mL vial, 0.736 g of sucrose stearate (Mitsubishi Chemical Food Corp., RYOTO Sugar Ester S-370) having an HLB of 3 was dissolved in 6.62 g of n-heptane to prepare a surfactant solution. While stirring at a rotation speed of 550 rpm, the inside of the system was sufficiently replaced with nitrogen, and the flask was immersed in a water bath at 70°C to increase the temperature. Polymerization was performed for 60 minutes to obtain a first-stage polymerization slurry solution.

[0117] On the other hand, in another beaker of 500 mL in content volume, 128.8 g (1.43 moles) of an aqueous solution of acrylic acid 80.5 mass% as a water-soluble ethylenically unsaturated monomer was measured, 27 mass% of an aqueous solution of sodium hydroxide 159.0 g was added dropwise while cooling with ice water, 75 mole% neutralization was performed, then, 0.103 g (0.381 μmoles) of potassium persulfate as a water-soluble radical polymerization initiator, 0.0117 g (0.067 μmoles) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved, and a second-stage aqueous solution was prepared.

[0118] After the inside of the separable flask system described above was cooled to 27°C while stirring at 1000 rpm, the total amount of the second-stage aqueous solution described above was added to the first-stage polymerization slurry solution, the inside of the system was replaced with nitrogen for 30 minutes, then the flask was immersed in a water bath set to 70°C to warm up, and a 60-minute polymerization reaction was performed, and a hydrogel-containing polymer was obtained.

[0119] Then, the flask was immersed in an oil bath set to 125°C, and 259.9 g of water was discharged to the outside of the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. Then, 4.42 g (0.507 mmol) of an aqueous solution of ethylene glycol diglycidyl ether 2 mass% as a surface crosslinking agent was added to the flask, and was maintained at 83°C for 2 hours.

[0120] Then, n-heptane was evaporated and dried at 125°C, and was further passed through a mesh of 850 μm, and thus a water-absorbing resin particle 220.4 g was obtained. The saline water retention of the water-absorbing resin particle was 40 g / g, the water absorption speed was 32 seconds, the median particle diameter was 278 μm, and the saline water absorption under a load of 4.14 kPa was 20 ml / g.

[0121] <Manufacturing Example 3> A separable flask of a round bottom cylindrical shape with an inner diameter of 11 cm and a capacity of 2 L was prepared, which was equipped with a reflux condenser, a dropping funnel, a nitrogen inlet tube, and a stirrer with 4 inclined blades having a 2-stage blade diameter of 5 cm. In the flask, 293 g of n-heptane was taken as a hydrocarbon dispersion medium, 0.736 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., HI-WAX 1105A) was added as a high-molecular-weight dispersant, and the dispersant was dissolved with stirring while being warmed to 80°C, and then the temperature was cooled to 50°C. On the other hand, in a beaker with a content volume of 300 mL, 92.0 g (1.03 moles) of an 80.5 mass% aqueous solution of acrylic acid was taken as a water-soluble ethylenically unsaturated monomer, neutralized by 75 mole% by dropwise addition of a 20.9 mass% aqueous sodium hydroxide solution 147.7 g while being cooled with ice water, and then, 0.092 g (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) of hydroxyethyl cellulose was added as a thickening agent, 0.0736 g (0.272 micromoles) of potassium persulfate was added as a water-soluble radical polymerization initiator, and 0.010 g (0.057 micromoles) of ethylene glycol diglycidyl ether was added as an internal crosslinking agent, and dissolved to prepare a first-stage aqueous solution. Then, the above-prepared aqueous solution was added to the separable flask, and after stirring for 10 minutes, 0.736 g of a surfactant solution in which 6.62 g of n-heptane was heated and dissolved with 0.736 g of sucrose stearate (Mitsubishi Chemical Food Corp., RYOTO Sugar Ester S-370) having an HLB of 3 as a surfactant was further added in a 20 mL- test tube, the stirring speed of the stirrer was set to 550 rpm, the inside of the system was sufficiently replaced with nitrogen while stirring, and then, the flask was immersed in a water bath at 70°C to warm up, and polymerization was performed for 60 minutes, whereby a first-stage polymerization slurry solution was obtained.

[0122] On the other hand, in another beaker with a content volume of 500 mL, 128.8 g (1.43 moles) of an 80.5 mass% aqueous solution of acrylic acid was taken as a water-soluble ethylenically unsaturated monomer, neutralized by 75 mole% by dropwise addition of a 27 mass% aqueous sodium hydroxide solution 159.0 g while being cooled with ice water, and then, 0.103 g (0.381 micromoles) of potassium persulfate was added as a water-soluble radical polymerization initiator, and 0.0117 g (0.067 micromoles) of ethylene glycol diglycidyl ether was added as an internal crosslinking agent, and dissolved to prepare a second-stage aqueous solution.

[0123] After the inside of the separable flask system was cooled to 25°C while stirring at 1000 rpm, the total amount of the aqueous solution of the second stage was added to the polymerization slurry solution of the first stage, the inside of the system was replaced with nitrogen for 30 minutes, and then the flask was immersed in a water bath set at 70°C to warm up, and a polymerization reaction was performed for 60 minutes to obtain a hydrogel-like polymer.

[0124] Then, the flask was immersed in an oil bath set at 125°C, and 259.9 g of water was discharged outside the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. Then, 4.42 g (0.507 mmol) of a 2 mass% ethylene glycol diglycidyl ether aqueous solution as a surface crosslinking agent was added to the flask, and the temperature was maintained at 83°C for 2 hours.

[0125] Then, n-heptane was evaporated and dried at 125°C, and then passed through a 850 μm mesh screen to obtain water-absorbent resin particles 226.1 g. The saline water retention of the water-absorbent resin particles was 42 g / g, the water absorption speed was 42 seconds, the median particle diameter was 366 μm, and the saline water absorption under a load of 4.14 kPa was 20 ml / g.

[0126] <Manufacturing Example 4> A separable flask of a round bottom cylindrical shape with an inner diameter of 11 cm and a capacity of 2 L was prepared, which was equipped with a reflux condenser, a dropping funnel, a nitrogen inlet tube, and a stirrer with 4 inclined blades having a 2-stage blade diameter of 5 cm. In the flask, 293 g of n-heptane was taken as a hydrocarbon dispersion medium, 0.736 g of a maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., HI-WAX 1105A) was added as a high-molecular-weight dispersant, and the dispersant was dissolved with stirring while being warmed to 80°C, and then the temperature was cooled to 50°C. On the other hand, in a beaker with a content volume of 300 mL, 92.0 g (1.03 moles) of an 80.5 mass% aqueous solution of acrylic acid was taken as a water-soluble ethylenically unsaturated monomer, neutralized by 75 mole% by dropwise addition of a 20.9 mass% aqueous sodium hydroxide solution 147.7 g while being cooled with ice water, and then 0.092 g (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) of hydroxyethyl cellulose was added as a thickening agent, 0.0736 g (0.272 micromoles) of potassium persulfate was added as a water-soluble radical polymerization initiator, and 0.010 g (0.057 micromoles) of ethylene glycol diglycidyl ether was added as an internal crosslinking agent, and dissolved to prepare a first-stage aqueous solution. Then, the above-prepared aqueous solution was added to the separable flask, and after stirring for 10 minutes, 0.736 g of a surfactant solution in which 6.62 g of n-heptane was heated and dissolved with 0.736 g of sucrose stearate (Mitsubishi Chemical Food Corp., RYOTO Sugar Ester S-370) having an HLB of 3 as a surfactant was further added in a 20 mL- test tube, the stirring speed of the stirrer was set to 550 rpm, the inside of the system was sufficiently replaced with nitrogen while stirring, and then the flask was immersed in a water bath at 70°C to warm up, and polymerization was performed for 60 minutes, whereby a first-stage polymerization slurry solution was obtained.

[0127] On the other hand, in another beaker with a content volume of 500 mL, 128.8 g (1.43 moles) of an 80.5 mass% aqueous solution of acrylic acid was taken as a water-soluble ethylenically unsaturated monomer, neutralized by 75 mole% by dropwise addition of a 27 mass% aqueous sodium hydroxide solution 159.0 g while being cooled with ice water, and then 0.103 g (0.381 micromoles) of potassium persulfate was added as a water-soluble radical polymerization initiator, and 0.0117 g (0.067 micromoles) of ethylene glycol diglycidyl ether was added as an internal crosslinking agent, and dissolved to prepare a second-stage aqueous solution.

[0128] While stirring at 1000 rpm, the system of the separable flask was cooled to 23°C. The total amount of the aqueous liquid in the second stage was added to the polymer slurry in the first stage. The system was purged with nitrogen for 30 minutes. The flask was then immersed in a water bath at 70°C for 60 minutes to carry out the polymerization reaction, resulting in a hydrogel polymer.

[0129] Then, the flask was immersed in an oil bath set to 125°C, and 259.9 g of water was discharged from the system by azeotropic distillation of n-heptane and water, while the n-heptane was refluxed. Then, 4.42 g (0.507 mmol) of a 2% by mass aqueous solution of ethylene glycol diglycidyl ether as a surface crosslinking agent was added to the flask, and the mixture was kept at 83°C for 2 hours.

[0130] Then, the n-heptane was evaporated and dried at 125°C, and then passed through a sieve with an 850 μm mesh to obtain 226.1 g of water-absorbing resin particles. The physiological saline water retention capacity of the water-absorbing resin particles was 42 g / g, the water absorption rate was 45 seconds, the median particle size was 389 μm, and the physiological saline water absorption capacity under a load of 4.14 kPa was 20 ml / g.

[0131] [Evaluation of water-absorbing resin particles] <Water absorption of physiological saline under a load of 4.14 kPa> 4.14 kPa load and the amount of physiological saline absorbed (water absorption under load) Figure 1 The apparatus is shown in the diagram for measurement. Two measurements were performed on one type of absorbent resin particles, and the average value was calculated. The apparatus includes a burette section 1, a clamp 3, a conduit 5, a stand 11, a measuring stage 13, and a measuring part 4 placed on the measuring stage 13. The burette section 1 includes: a graduated burette 21, a rubber stopper 23 that seals the opening at the top of the burette 21, a stopcock 22 connected to the lower front end of the burette 21, an air inlet tube 25 connected to the lower part of the burette 21, and a stopcock 24. The burette section 1 is fixed by the clamp 3. The flat measuring stage 13 has a 2mm diameter through-hole 13a formed in its center and is supported by the height-variable stand 11. The through-hole 13a of the measuring stage 13 is connected to the stopcock 22 of the burette section 1 via the conduit 5. The inner diameter of the conduit 5 is 6mm.

[0132] The measuring section 4 has a cylinder 31 made of Plexiglas, a polyamide mesh 32 bonded to one of the opening portions of the cylinder 31, and a counterweight 33 movable in the up-and-down direction inside the cylinder 31. The cylinder 31 is placed on the measuring table 13 with the polyamide mesh 32 interposed therebetween. The inner diameter of the cylinder 31 is 20 mm. The mesh size of the polyamide mesh 32 is 75 μm (200 mesh). The diameter of the counterweight 33 is 19 mm, and the mass is 119.6 g. As will be described later, the counterweight 33 can apply a load of 4.14 kPa (0.6 psi) to the water-absorbent resin particles 10a uniformly arranged on the polyamide mesh 32.

[0133] First, the stopcock 22 and the stopcock 24 of the burette section 1 are closed, and 0.9 mass% physiological saline adjusted to 25°C is injected into the burette 21 from the opening in the upper portion of the burette 21. Next, after tightly capping the upper opening of the burette 21 with the rubber stopper 23, the stopcock 22 and the stopcock 24 are opened. The inside of the conduit 5 is filled with the 0.9 mass% saline 50 in such a manner that no air bubbles enter. The height of the measuring table 13 is adjusted so that the height of the water surface of the 0.9 mass% saline in the through-hole 13a is the same as the height of the upper surface of the measuring table 13. After the adjustment, the height of the water surface of the 0.9 mass% saline 50 in the burette 21 is read from the scale of the burette 21, and the position thereof is taken as the zero point (the reading at 0 seconds).

[0134] In the measuring section 4, 0.10 g of the water-absorbent resin particles 10a is uniformly arranged on the polyamide mesh 32 inside the cylinder 31, and the counterweight 33 is arranged on the water-absorbent resin particles 10a. The cylinder 31 is disposed so that the center portion thereof coincides with the conduit opening in the center portion of the measuring table 13. The amount of decrease in the physiological saline in the burette 21 after 60 minutes from the start of the absorption of the physiological saline from the conduit 5 by the water-absorbent resin particles 10a (i.e., the amount of the physiological saline absorbed by the water-absorbent resin particles 10a) Wc (mL) is read, and the physiological saline water-absorption capacity of the water-absorbent resin particles 10a under a load of 4.14 kPa is calculated by the following equation.

[0135] Physiological saline water-absorption capacity under a load of 4.14 kPa (mL / g) = Wc (mL) / mass of water-absorbent resin particles (g) <Measurement of Water Absorption Rate Based on Vortex Method> In a thermostatic water bath, 50 ± 0.1 g of physiological saline adjusted to a temperature of 25 ± 0.2°C is measured in a 100 mL beaker, and stirred with a magnetic stirrer (8 mmφ x 30 mm without a ring) at a rotation speed of 600 rpm to generate a vortex. 2.0 ± 0.002 g of water-absorbent resin particles is added at once to the above physiological saline, and the time (seconds) from the addition of the water-absorbent resin particles to the time when the vortex of the liquid surface subsides is measured, and this time is taken as the water absorption rate of the water-absorbent resin particles. This water absorption rate is also referred to as the vortex method or the vortex time.

[0136] <Median particle diameter (particle size distribution) of water-absorbent resin particles> Water-absorbent resin particles 50.0 g were used for median particle diameter (particle size distribution) measurement. JIS standard sieves were combined in the order of a sieve with a mesh of 850 μm, a sieve with a mesh of 500 μm, a sieve with a mesh of 425 μm, a sieve with a mesh of 300 μm, a sieve with a mesh of 250 μm, a sieve with a mesh of 180 μm, a sieve with a mesh of 150 μm, and a tray from the top. The water-absorbent resin particles were put in the uppermost sieve of the combination, and fractionation was performed using a Ro-Tap type shaker for 20 minutes. After the fractionation, the mass percentage of the water-absorbent resin particles remaining on each sieve with respect to the total mass was calculated, and the particle size distribution was determined. With respect to the particle size distribution, the oversize was cumulatively measured from the side of larger particle diameter, and thus the relationship between the mesh of the sieve and the cumulative value of the mass percentage of the water-absorbent resin particles remaining on the sieve was plotted on a log-probability paper. By connecting the plotted points on the probability paper with a straight line, the particle diameter corresponding to a cumulative mass percentage of 50 mass% was determined as the median particle diameter.

[0137] [Preparation of porous deodorant] As the porous deodorant, the following activated carbons A and B were prepared. The activated carbon A is an activated carbon containing bromine molecules as halogen, and the activated carbon B is an activated carbon not containing halogen.

[0138] <Activated carbon A> The activated carbon (GS2x4 / 6S) of Osaka Gas Chemical Co., Ltd. was crushed with a mortar, and the activated carbon passing through a sieve with a mesh of 83 μm was used as the activated carbon A. The median particle diameter of this activated carbon was 48 μm, and the bromine content was 6%.

[0139] <Activated carbon B> The activated carbon (GH2x4 / 6S) of Osaka Gas Chemical Co., Ltd. was crushed with a mortar, and the activated carbon passing through a sieve with a mesh of 83 μm was used as the activated carbon B. The median particle diameter of this activated carbon was 56 μm, and the bromine content was 0%.

[0140] [Evaluation of porous deodorant] <Median particle diameter (laser diffraction) of activated carbon> The median particle diameter (D50 (median particle diameter), volume basis) of the activated carbon used was measured using a laser diffraction type particle size distribution measuring device (manufactured by Shimadzu Corporation, SALD2300).

[0141] [Measurement of bromine content of activated carbon] To 0.5 mg of activated carbon, a combustion-supporting agent was added, and the gas generated by combustion was captured with 10 mL of an absorption liquid. The substance obtained by adding 5 mL of ultrapure water to the absorption liquid was measured with a Thermo Fisher Scientific, ICS-5000. Note that the substance with a high bromine concentration was diluted with ultrapure water and measured.

[0142] [Manufacture of Deodorant Composition] Example 1 To 100 parts by mass of the water-absorbent resin particles of Production Example 1, 0.1 parts by mass of activated carbon A was added, and a cross-rotating mixer manufactured by Nakanihon Industries Co., Ltd. was used to mix for 30 minutes (conditions, 50 rpm of revolution speed, 50 rpm of rotation speed), thereby obtaining a deodorant composition. Using 6 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 9 ppm.

[0143] Example 2 Using the water-absorbent resin particles of Production Example 2, the same operation as in Example 1 was performed except for this, thereby obtaining a deodorant composition. Using 6 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 10 ppm.

[0144] Example 3 Using the water-absorbent resin particles of Production Example 3, the same operation as in Example 1 was performed except for this, thereby obtaining a deodorant composition. Using 6 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 12 ppm.

[0145] Example 4 Using the water-absorbent resin particles of Production Example 4, the same operation as in Example 1 was performed except for this, thereby obtaining a deodorant composition. Using 6 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 13 ppm.

[0146] Example 5 To 100 parts by mass of the water-absorbent resin particles of Production Example 2, 0.2 parts by mass of activated carbon A was added, and the same operation as in Example 1 was performed except for this, thereby obtaining a deodorant composition. Using 3 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 12 ppm.

[0147] Comparative Example 1 The activated carbon added to the water-absorbent resin particles was changed to activated carbon B, and the same operation as in Example 1 was performed except for this, thereby obtaining a deodorant composition. Using 6 g of the deodorant composition, the deodorizing test described later was performed, and as a result, the concentration of methyl mercaptan was 15 ppm.

[0148] <Comparative Example 2> The activated carbon added to the water-absorbent resin particles was changed to activated carbon B, and otherwise the same operation as in Example 4 was performed to obtain a deodorant composition. Using 6 g of the deodorant composition, the deodorization test described later was performed, and as a result, the concentration of methyl mercaptan was 15 ppm.

[0149] <Comparative Example 3> Without using the water-absorbent resin particles, only 0.006 mg of activated carbon A was used, and the deodorization test described later was performed, and the concentration of methyl mercaptan was 17 ppm.

[0150] <Comparative Example 4> Without using the water-absorbent resin particles, only 0.006 mg of activated carbon B was used, and the deodorization test described later was performed, and the concentration of methyl mercaptan was 15 ppm.

[0151] <Comparative Example 5> Without using activated carbon, only 6 g of the water-absorbent resin particles of Production Example 1 was used, and the deodorization test described later was performed, and the concentration of methyl mercaptan was 17 ppm.

[0152] <Comparative Example 6> Without using the water-absorbent resin particles and activated carbon, the deodorization test was performed in a state in which only a petri dish filled with artificial urine was put into a sampling bag, and as a result, the concentration of methyl mercaptan was 17 ppm.

[0153] <Reference Example 1> Without using the water-absorbent resin particles, activated carbon, and artificial urine, the deodorization test was performed in a state in which only a petri dish was put into a sampling bag, and as a result, the concentration of methyl mercaptan was 20 ppm.

[0154] [Deodorization Test] Artificial urine was prepared by adding urea 20.0 g, sodium chloride 8.0 g, calcium chloride dihydrate 0.3 g, and magnesium sulfate heptahydrate 0.8 g to distilled water 970.0 g. A prescribed amount of the deodorant composition was put into a sterilized plastic petri dish with an inner diameter of 70 mm, and 20 mL of the artificial urine was poured. The plastic petri dish was sealed in a polyester 2 L sampling bag (GL Science Co., Ltd., PAAAK2), and after the air in the bag was extracted using a syringe, it was left to stand for 3 hours. After 3 hours of standing, 900 mL of air containing 20 ppm of methyl mercaptan was sealed in the smart bag, and left to stand for 1 hour. After 1 hour, the concentration of methyl mercaptan in the gas phase in the smart bag was measured using a No. 71 detection tube (GL Science Co., Ltd.).

[0155] [Table 1]

[0156] As shown in Table 1, the deodorant compositions of Examples 1 to 5 contain a porous deodorant containing halogen and water-absorbent resin particles, and the content of halogen is 0.0030 mass% or more. It is known that the deodorant compositions of Examples 1 to 5 have excellent deodorizing effects on methyl mercaptan in the deodorizing test in the environment where artificial urine containing a polyvalent metal salt and methyl mercaptan coexist. From these results, it can be said that the polyvalent metal salt contained in urine is rapidly absorbed by the water-absorbent resin particles, thereby inhibiting the reaction of halogen molecules of the porous deodorant with the polyvalent metal salt in urine, and the porous deodorant containing halogen exerts a high deodorizing effect on methyl mercaptan contained in large amounts in feces.

[0157] Explanation of symbols 1: burette portion 3: clamp 4: measurement portion 5: conduit 10a: water-absorbent resin particles 11: stand 13: measurement stand 13a: through-hole 21: burette 22: stopcock 23: rubber stopper 24: stopcock 25: air introduction tube 31: cylinder 32: polyamide mesh 33: counterweight 50: saline solution

Claims

1. A deodorant composition characterized in that, contains: a porous deodorant containing halogen, and water-absorbent resin particles, the content of the halogen is 0.0030% by mass or more.

2. The deodorant composition according to claim 1, wherein, the halogen includes at least one selected from the group consisting of bromine and chlorine.

3. The deodorant composition according to claim 1 or 2, wherein, the porous deodorant includes at least one compound selected from the group consisting of activated carbon, zeolite, silicon dioxide, and silicate.

4. The deodorant composition according to claim 1 or 2, wherein, the ratio Z / (X+Y) of the content Z (% by mass) of the water-absorbent resin particles to the sum (X+Y) of the content X (% by mass) of the porous deodorant and the content Y (% by mass) of the halogen is 200 or more.

5. The deodorant composition according to claim 1 or 2, wherein, the water-absorbent resin particles have a water absorption speed based on the vortex method of 50 seconds or less.

6. An absorbent article, characterized by a deodorant composition according to claim 1 or 2.

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