Deodorant composition

Abstract

Provided is a deodorant composition having an excellent deodorizing effect against methyl mercaptan.　This deodorant composition comprises: a porous deodorant containing a halogen; and water-absorbing resin particles. The contained amount of the halogen is 0.0030 mass% or more.

Description

Deodorant composition

[0001] The present invention relates to a deodorant composition.

[0002] Absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads are mainly composed of an absorbent core located in the center, which absorbs and retains body fluids such as urine and menstrual blood excreted from the body, a liquid-permeable surface sheet (top sheet) located on the side that comes into contact with the body, and a liquid-impermeable back sheet (back sheet) located on the opposite side that comes into contact with the body. The absorbent core is usually composed of hydrophilic fibers such as pulp and a water-absorbent resin.

[0003] Japanese Patent Application Laid-Open No. 2001-323155

[0004] 2. Description of the Related Art Porous deodorizers such as activated carbon are sometimes used in absorbent articles to eliminate odors emanating from body fluids such as urine.

[0005] Furthermore, absorbent articles retain not only bodily fluids such as urine, but also feces, which emit the odor of methyl mercaptan.

[0006] Halogen-containing porous deodorants are known as deodorizers that have an excellent deodorizing effect against sulfur compounds such as methyl mercaptan. Halogen-containing porous deodorants are effective in reducing odors caused by sulfur compounds by reacting with the halogens.

[0007] The inventors of the present invention have investigated the use of a halogen-containing porous deodorant to impart a deodorizing effect against methyl mercaptan to absorbent articles, and as a result have discovered a new problem in that although the halogen-containing porous deodorant reduces the odor of methyl mercaptan, the deodorizing effect against the odor of methyl mercaptan is weakened when urine is present together with the mercaptan.

[0008] A main object of the present invention is to provide a deodorant composition having an excellent deodorizing effect against methyl mercaptan.

[0009] The present inventors have conducted extensive research to solve the above-mentioned problems. As a result, they have found that an excellent deodorizing effect against methyl mercaptan can be exhibited by using a halogen-containing porous deodorizer and water-absorbent resin particles in a deodorizer composition in combination, and setting the halogen content in the deodorizer composition to a predetermined value or more. The present invention was completed based on this finding and through further extensive research.

[0010] That is, the present invention provides the following features. Item 1. A deodorant composition comprising a porous deodorant containing a halogen and water-absorbent resin particles, wherein the halogen content is 0.0030% by mass or more. 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. 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, silicon dioxide, and silicates. Item 4. The deodorant composition according to any one of Items 1 to 3, wherein the ratio (Z / (X+Y)) of the content Z (mass%) of the water-absorbent resin particles to the sum (X+Y) of the content X (mass%) of the porous deodorant and the content Y (mass%) of the halogen is 200 or more. Item 5. Item 6. The deodorant composition according to any one of items 1 to 4, wherein the water-absorbing resin particles have a water absorption rate of 50 seconds or less as measured by a Vortex method. Item 7. An absorbent article comprising the deodorant composition according to any one of items 1 to 5.

[0011] According to the present invention, it is possible to provide a deodorant composition having an excellent deodorizing effect against methyl mercaptan.

[0012] FIG. 1 is a schematic diagram of a device for measuring the amount of saline solution absorbed under a load of 4.14 kPa.

[0013] In this specification, the term "comprising" includes "consisting essentially of" and "consisting of". Furthermore, in this specification, "(meth)acrylic" means "acrylic or methacrylic", and "(meth)acrylate" means "acrylate or methacrylate". Furthermore, "water-soluble" means exhibiting a solubility of 5% by mass or more in water at 25°C.

[0014] In addition, in this specification, a numerical value connected with "~" means a numerical range that includes the numerical values ​​before and after "~" as the lower limit and upper limit. When multiple lower limit values ​​and multiple upper limit values ​​are listed separately, any lower limit value and upper limit value can be selected and connected with "~".

[0015] 1. Deodorant Composition The deodorant composition of the present invention is characterized by comprising a halogen-containing porous deodorant and water-absorbent resin particles, and having a halogen content of 0.0030 mass% or more. The deodorant composition of the present invention having such characteristics exhibits an excellent deodorizing effect against methyl mercaptan. The deodorant composition of the present invention will be described in detail below.

[0016] As mentioned above, the inventors of the present invention have investigated the use of a halogen-containing porous deodorant to impart a deodorizing effect against methyl mercaptan to absorbent articles. However, they have discovered a new problem: although the odor of methyl mercaptan is reduced by the halogen-containing porous deodorant, the deodorizing effect against the odor of methyl mercaptan from feces is reduced when urine is present together with methyl mercaptan.

[0017] After further investigation, the inventors of the present invention found that the main cause of this problem is that polyvalent metal salts (alkali metals, alkaline earth metals) contained in urine react with the halogens of the porous deodorant, thereby reducing the deodorizing effect of methyl mercaptan and preventing the deodorization of methyl mercaptan contained in feces. Furthermore, the inventors of the present invention found that by using a halogen-containing porous deodorant in combination with water-absorbent resin particles in a deodorant composition and setting the halogen content in the deodorant composition to 0.0030 mass% or more, an excellent deodorizing effect against methyl mercaptan can be exhibited. In the deodorant composition of the present invention, the polyvalent metal salts contained in urine are absorbed by the water-absorbent resin particles before coming into contact with the halogen molecules of the porous deodorant, thereby suppressing the reaction between the halogens of the porous deodorant and the polyvalent metal salts, and thereby exhibiting a high deodorizing effect against methyl mercaptan contained in feces in large quantities.

[0018] (Halogen-Containing Porous Deodorant) The halogen-containing porous deodorant is a porous deodorant that contains a halogen element.

[0019] In the present invention, the halogen-containing porous deodorant may be any known one that exhibits the deodorizing effect of methyl mercaptan.

[0020] From the viewpoint of suitably exerting the effects of the present invention, in the halogen-containing porous deodorant, the halogen is preferably contained in the porous deodorant as a halogen molecule. Moreover, the halogen preferably contains at least one selected from the group consisting of bromine and chlorine, and more preferably contains bromine.

[0021] A preferred example of a porous deodorizer containing a halogen is activated carbon containing bromine. For example, bromine-impregnated activated carbon is known as a porous deodorizer having a deodorizing effect on sulfur compounds, and it can also be used as a porous deodorizer containing a halogen in the present invention. Examples of bromine-impregnated activated carbon include that described in JP-A-11-33397. Methods for impregnating activated carbon with bromine are known, and bromine-impregnated activated carbon can be produced by, for example, a gas-phase impregnation method in which a carrier gas containing bromine gas is brought into contact with activated carbon that has been subjected to a desired treatment, a liquid-phase impregnation method in which treated activated carbon is immersed in bromine water, or a method in which liquid bromine or the like is directly sprayed onto treated activated carbon to impregnate the carbon.

[0022] In the deodorant composition of the present invention, the halogen content is 0.0030% by mass or more. From the viewpoint of more suitably exhibiting the effects of the present invention, the halogen content in the deodorant composition is preferably 0.0035% by mass or more, more preferably 0.0040% by mass or more, even more preferably 0.0050% by mass or more, and is preferably 0.010% by mass or less, more preferably 0.0080% by mass or less, even more preferably 0.0070% by mass or less, and preferably in the range of 0.0030% by mass to 0.010% by mass, 0.0030% by mass to 0.00 8% 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.

[0023] From the viewpoint of more suitably exerting the effects of the present invention, the porous deodorant may contain at least one selected from the group consisting of activated carbon, zeolite, silicon dioxide, silicate, titania, alumina, aluminum hydroxide, and magnesium hydroxide, or may 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.

[0024] Examples of sources of activated carbon include coconut shells, infusible or carbonized organic materials, and infusible resins such as phenolic resins. Examples of organic materials include polyacrylonitrile, pitch, polyvinyl alcohol, and cellulose. Among these, activated carbon is preferably derived from wood (sawdust), coconut shells, or pitch (e.g., coal pitch).

[0025] The median particle size of the porous deodorant may 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.

[0026] The median particle size (D50 (median size), volume basis) of the porous deodorant can be measured using a laser diffraction particle size distribution measuring device, and specifically, it is a value measured by the method described in the examples.

[0027] The shape of the porous deodorant may be, for example, pulverized or cylindrical, and is preferably pulverized.

[0028] The BET specific surface area of ​​the porous deodorant is 100 m 2 / g to 3000m 2 / g, 100m 2 / g~2500m 2 / g, 100m 2 / g to 2000m 2 / g, 100m 2 / g~1500m 2 / g, 500m 2 / g to 3000m 2 / g, 500m 2 / g~2500m 2 / g, 500m 2 / g to 2000m 2 / g, 500m 2 / g~1500m 2 / g, 1000m 2 / g to 3000m 2 / g, 1000m 2 / g~2500m 2 / g, 1000m2 / g to 2000m 2 / g or 1000m 2 / g~1500m 2 If the BET specific surface area of ​​the porous deodorant is too large, the pores become finer, which may reduce the strength of the porous deodorant and increase the dust generation rate described above. Therefore, the upper limit of the BET specific surface area is set to 2000 m 2 / g.

[0029] The BET specific surface area of ​​the porous deodorant can be measured using a specific surface area measuring device.

[0030] The loss on drying of the porous deodorant may 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%.

[0031] Here, the loss on drying of the porous deodorant is a value measured in accordance with JIS K1474:2014.

[0032] In the deodorant composition of the present invention, it is preferable that the halogen-containing porous deodorant is 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 halogen-containing porous deodorant in a solid phase state, the halogen-containing porous deodorant is attached to the surface of the water-absorbent resin particles, and the halogen-containing porous deodorant can be disposed on the surface of the water-absorbent resin particles.

[0033]

[0046] From the viewpoint of more suitably exerting the effects of the present invention, in the deodorant composition of the present invention, the ratio (Z / (X+Y)) of the content Z (mass%) of the water-absorbent resin particles to the sum (X+Y) of the content X (mass%) of the porous deodorant and the content Y (mass%) of the halogen is preferably 200 or more, more preferably 500 or more, still more preferably 950 or more, and is preferably 2000 or less, more preferably 1500 or less, still more preferably 1300 or less, and preferred ranges include 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.

[0034] Furthermore, from the viewpoint of more suitably exerting the effects of the present invention, in the deodorant composition of the present invention, the sum (X+Y) of the porous deodorant content X (% by mass) and the halogen content Y (% by mass) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.08% by mass or more, and is preferably 0.30% by mass or less, more preferably 0.20% by mass or less, and even more preferably 0.15% by mass or less; preferred ranges include 0.01% by mass to 0.30% by mass, 0.01% by mass to 0.20% by mass, 0.01% by mass to 0.15% by mass, 0.05% by mass to 0.30% by mass, 0.05% by mass to 0.2% by mass, 0.05% by mass to 0.15% by mass, 0.08% by mass to 0.30% by mass, 0.08% by mass to 0.20% by mass, and 0.08% by mass to 0.15% by mass.

[0035] Furthermore, from the viewpoint of more suitably exerting the effects of the present invention, the content of halogen in the halogen-containing porous deodorant is preferably 0.3% by mass or more, more preferably 1.5% by mass or more, and even more preferably 2.4% by mass or more, and is preferably 10.0% by mass or less, more preferably 8.0% by mass or less, and even more preferably 7.0% by mass or less, and preferred ranges include 0.3% by mass to 10% by mass, 0.3% by mass to 8.0% by mass, 0.3% by mass to 7.0% by mass, 1.5% by mass to 10.0% by mass, 1.5% by mass to 8.0% by mass, 1.5% by mass to 7.0% by mass, 2.4% by mass to 10.0% by mass, 2.4% by mass to 8.0% by mass, and 2.4% by mass to 7.0% by mass.

[0036] Next, the water-absorbing resin particles contained in the deodorant composition of the present invention will be described in detail.

[0037] (Water-absorbent resin particles) The water-absorbent resin particles contained in the deodorant composition of the present invention are constituted by a crosslinked polymer of a water-soluble ethylenically unsaturated monomer, i.e., a crosslinked polymer having a structural unit derived from a water-soluble ethylenically unsaturated monomer.

[0038] The water absorption speed of the water-absorbent resin particles as measured by the Vortex method is preferably 50 seconds or less, more preferably 44 seconds or less, even more preferably 35 seconds or less, and particularly preferably 10 seconds or less, and is preferably 1 second or more, more preferably 2 seconds or more. Preferred ranges include 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, and 2 seconds to 10 seconds.

[0039] The water absorption rate of the water-absorbent resin particles measured by the Vortex method is a value measured by the method described in the Examples.

[0040] The median particle diameter of the water-absorbent resin particles is, 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.

[0041] The water-absorbent resin particles may be in a form consisting of a single particle, or may be in a form (secondary particles) in which fine particles (primary particles) are aggregated. Examples of the shape of the primary particles include substantially spherical, irregularly crushed, and plate-like. In the case of primary particles produced by reversed-phase suspension polymerization, examples of the shape include substantially spherical single particle shapes having a smooth surface shape such as a perfect sphere or an oval sphere.

[0042] The median particle size of the water-absorbent resin particles can be measured using a JIS standard sieve, and specifically, it is a value measured by the method described in the examples.

[0043] The water-absorbent resin particles have a constituent unit derived from a neutralized salt of a water-soluble ethylenically unsaturated monomer. Typical polymerization methods for polymerizing the water-soluble ethylenically unsaturated monomer include aqueous solution polymerization, emulsion polymerization, and reversed-phase suspension polymerization. In the aqueous solution polymerization, polymerization is carried out by heating an aqueous solution of the water-soluble ethylenically unsaturated monomer while stirring as necessary. In the reversed-phase suspension polymerization, polymerization is carried out by heating the water-soluble ethylenically unsaturated monomer in a hydrocarbon dispersion medium while stirring.

[0044] An example of a method for producing water-absorbent resin particles will be described below.

[0045] A specific example of the method for producing water-absorbent resin particles is a method for producing water-absorbent resin particles by reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon dispersion medium, which method comprises the steps of carrying out polymerization in the presence of a radical polymerization initiator and surface-crosslinking the hydrogel-like material obtained by the polymerization in the presence of a surface crosslinking agent. Note that, in the method for producing water-absorbent resin particles of the present invention, an internal crosslinking agent may be added to the water-soluble ethylenically unsaturated monomer as needed to form a hydrogel-like material having an internal crosslinking structure.

[0046] <Polymerization Step> [Water-Soluble Ethylenically Unsaturated Monomer] Examples of the water-soluble ethylenically unsaturated monomer include (meth)acrylic acid (in this specification, "acrylic" and "methacrylic" are collectively referred to as "(meth)acrylic", the same applies hereinafter) and salts thereof; 2-(meth)acrylamido-2-methylpropanesulfonic acid and salts 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; and amino group-containing unsaturated monomers such as N,N-diethylaminoethyl(meth)acrylate, N,N-diethylaminopropyl(meth)acrylate, and diethylaminopropyl(meth)acrylamide, and quaternized products thereof. Among these water-soluble ethylenically unsaturated monomers, (meth)acrylic acid or a salt thereof, (meth)acrylamide, and N,N-dimethylacrylamide are preferred, and (meth)acrylic acid and a salt thereof are more preferred, from the viewpoint of industrial ease of availability, etc. These water-soluble ethylenically unsaturated monomers may be used alone or in combination of two or more.

[0047] Among these, acrylic acid and its salts are widely used as raw materials for water-absorbent resin particles, and these acrylic acid and / or salts thereof may be copolymerized with the other water-soluble ethylenically unsaturated monomers described above for use. In this case, it is preferable that acrylic acid and / or its salts are used as the main water-soluble ethylenically unsaturated monomer in an amount of 70 to 100 mol % based on the total amount of water-soluble ethylenically unsaturated monomers.

[0048] The water-soluble ethylenically unsaturated monomer may be dispersed in a hydrocarbon dispersion medium in the form of an aqueous solution and subjected to reversed-phase suspension polymerization. By forming the water-soluble ethylenically unsaturated monomer into an aqueous solution, the dispersion efficiency in the hydrocarbon dispersion medium can be increased. The concentration of the water-soluble ethylenically unsaturated monomer in this aqueous solution is preferably in the range of 20% by mass to the saturated concentration or less. The concentration of the water-soluble ethylenically unsaturated monomer is more preferably 55% by mass or less, even more preferably 50% by mass or less, and even more preferably 45% by mass or less. Meanwhile, the concentration of the water-soluble ethylenically unsaturated monomer is more preferably 25% by mass or more, even more preferably 28% by mass or more, and even more preferably 30% by mass or more.

[0049] When the water-soluble ethylenically unsaturated monomer has an acid group, such as (meth)acrylic acid or 2-(meth)acrylamido-2-methylpropanesulfonic acid, the acid group may be neutralized in advance with an alkaline neutralizing agent, as necessary. Examples of such alkaline neutralizing agents include alkali metal salts such as sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, and potassium carbonate; and ammonia. These alkaline neutralizing agents may be used in the form of an aqueous solution to simplify the neutralization operation. The alkaline neutralizing agents described above may be used alone or in combination of two or more.

[0050] The degree of neutralization of the water-soluble ethylenically unsaturated monomer with the alkaline neutralizing agent is preferably 10 to 100 mol %, more preferably 30 to 90 mol %, even more preferably 40 to 85 mol %, and still more preferably 50 to 80 mol %, as the degree of neutralization with respect to all acid groups possessed by the water-soluble ethylenically unsaturated monomer.

[0051] [Radical Polymerization Initiator] Examples of the radical polymerization initiator added to the polymerization step include persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate, peroxides such as methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, t-butyl peroxyacetate, t-butylperoxyisobutyrate, t-butylperoxypivalate, and hydrogen peroxide, as well as 2,2'-azobis(2-amidinopropane) dihydrochloride and 2,2'-azobis[2-(N-phenyl)propane]. Examples of the radical polymerization initiator include azo compounds such as 2,2'-azobis[2-(N-allylamidino)propane] dihydrochloride, 2,2'-azobis{2-[1-(2-hydroxyethyl)-2-imidazolin-2-yl]propane} dihydrochloride, 2,2'-azobis{2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]propionamide}, 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)-propionamide], and 4,4'-azobis(4-cyanovaleric acid). Among these radical polymerization initiators, potassium persulfate, ammonium persulfate, sodium persulfate, and 2,2'-azobis(2-amidinopropane) dihydrochloride are preferred from the viewpoints of ease of availability and handling. These radical polymerization initiators may be used alone or in combination of two or more. The radical polymerization initiator can also be used as a redox polymerization initiator in combination with a reducing agent such as sodium sulfite, sodium hydrogen sulfite, ferrous sulfate, or L-ascorbic acid.

[0052] The amount of radical polymerization initiator used is, for example, 0.00005 to 0.01 mole per mole of the water-soluble ethylenically unsaturated monomer. By using such an amount, it is possible to avoid a rapid polymerization reaction and complete the polymerization reaction within an appropriate time.

[0053] [Internal Crosslinking Agent] The internal crosslinking agent can be one that can crosslink the polymer of the water-soluble ethylenically unsaturated monomer used, such as (poly)ethylene glycol ("(poly)" refers to both the presence and absence of the prefix "poly"). the same applies hereinafter)], unsaturated polyesters obtained by reacting polyols such as diols and triols, such as (poly)propylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, and (poly)glycerin, with unsaturated acids, such as (meth)acrylic acid, maleic acid, and fumaric acid; bisacrylamides such as N,N-methylenebisacrylamide; di(meth)acrylic acid esters or tri(meth)acrylic acid esters obtained by reacting polyepoxides with (meth)acrylic acid; di(meth)acrylic acid carbamyl esters obtained by reacting polyisocyanates, such as tolylene diisocyanate and hexamethylene diisocyanate, with hydroxyethyl (meth)acrylate; allylated starch, allylated cellulose, diallyl phthalate, N,N',N''-triallyl isocyanurate, divinyl Examples of the compound include a compound having two or more polymerizable unsaturated groups such as benzene; a diglycidyl compound such as (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, (poly)glycerin diglycidyl ether, and the like, and a polyglycidyl compound such as a triglycidyl compound; an epihalohydrin compound such as epichlorohydrin, epibromohydrin, and α-methylepichlorohydrin; a compound having two or more reactive functional groups such as an isocyanate compound such as 2,4-tolylene diisocyanate and hexamethylene diisocyanate; and an oxetane compound such as 3-methyl-3-oxetane methanol, 3-ethyl-3-oxetane methanol, 3-butyl-3-oxetane methanol, 3-methyl-3-oxetane ethanol, 3-ethyl-3-oxetane ethanol, and 3-butyl-3-oxetane ethanol. Among these internal cross-linking agents, it is preferable to use a polyglycidyl compound, it is more preferable to use a diglycidyl ether compound, and it is preferable to use (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, or (poly)glycerin diglycidyl ether.These internal crosslinking agents may be used alone or in combination of two or more.

[0054] The amount of the internal crosslinking agent used is preferably 0.000001 to 0.02 mol, more preferably 0.00001 to 0.01 mol, even more preferably 0.00001 to 0.005 mol, and still more preferably 0.00005 to 0.002 mol, relative to 1 mol of the water-soluble ethylenically unsaturated monomer.

[0055] [Hydrocarbon Dispersion Medium] Examples of hydrocarbon dispersion media include aliphatic hydrocarbons having 6 to 8 carbon atoms, such as n-hexane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 3-ethylpentane, and n-octane; alicyclic hydrocarbons, such as cyclohexane, methylcyclohexane, cyclopentane, methylcyclopentane, trans-1,2-dimethylcyclopentane, cis-1,3-dimethylcyclopentane, and trans-1,3-dimethylcyclopentane; and aromatic hydrocarbons, such as benzene, toluene, and xylene. Among these hydrocarbon dispersion media, n-hexane, n-heptane, and cyclohexane are particularly preferred because they are easily available industrially, have stable quality, and are inexpensive. These hydrocarbon dispersion media may be used alone or in combination of two or more. As an example of a mixture of hydrocarbon dispersion media, a commercially available product such as Exxol Heptane (manufactured by ExxonMobil Corporation; contains 75 to 85% by mass of hydrocarbons such as heptane and its isomers) can also be used to obtain favorable results.

[0056] The amount of hydrocarbon dispersion medium used is preferably 100 to 1500 parts by mass, and more preferably 200 to 1400 parts by mass, per 100 parts by mass of the water-soluble ethylenically unsaturated monomer in the first stage, from the viewpoints of uniformly dispersing the water-soluble ethylenically unsaturated monomer and facilitating control of the polymerization temperature. As will be described later, the reversed-phase suspension polymerization is carried out in one stage (single stage) or in multiple stages of two or more stages, and the above-mentioned first stage polymerization refers to the polymerization reaction in the first stage of single-stage polymerization or multi-stage polymerization (the same applies hereinafter).

[0057] [Dispersion stabilizer] (Surfactant) In the reversed-phase suspension polymerization, a dispersion stabilizer can be used to improve the dispersion stability of the water-soluble ethylenically unsaturated monomer in the hydrocarbon dispersion medium. A surfactant can be used as the dispersion stabilizer.

[0058] Examples of surfactants that can be used include sucrose fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, sorbitol fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkylallyl formaldehyde condensed polyoxyethylene ethers, polyoxyethylene polyoxypropylene block copolymers, polyoxyethylene polyoxypropyl alkyl ethers, polyethylene glycol fatty acid esters, alkyl glucosides, N-alkyl gluconamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, phosphate esters of polyoxyethylene alkyl ethers, and phosphate esters of polyoxyethylene alkyl allyl ethers. Among these surfactants, sorbitan fatty acid esters, polyglycerin fatty acid esters, and sucrose fatty acid esters are particularly preferred from the standpoint of dispersion stability of the monomer. These surfactants may be used alone or in combination of two or more.

[0059] The amount of surfactant used is preferably 0.1 to 30 parts by mass, more preferably 0.3 to 20 parts by mass, per 100 parts by mass of the first stage water-soluble ethylenically unsaturated monomer.

[0060] (Polymer-Based Dispersant) As a dispersion stabilizer used in reversed-phase suspension polymerization, a polymer-based dispersant may be used in combination with the surfactant described above.

[0061] Examples of polymeric dispersants include 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 ethylhydroxyethyl cellulose. Among these polymeric dispersants, it is particularly preferable to use maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene-propylene copolymer, 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 from the viewpoint of dispersion stability of the monomer. These polymeric dispersants may be used alone or in combination of two or more.

[0062] The amount of the polymeric dispersant used is preferably 0.1 to 30 parts by mass, more preferably 0.3 to 20 parts by mass, per 100 parts by mass of the first stage water-soluble ethylenically unsaturated monomer.

[0063] [Other Components] In the method for producing water-absorbent resin particles, if desired, other components may be added to an aqueous solution containing a water-soluble ethylenically unsaturated monomer to carry out reverse phase suspension polymerization. As the other components, various additives such as a thickener and a chain transfer agent can be added.

[0064] For example, a thickener can be added to an aqueous solution containing a water-soluble ethylenically unsaturated monomer to carry out reversed-phase suspension polymerization. By adjusting the viscosity of the aqueous solution by adding a thickener in this way, it is possible to control the median particle size obtained in the reversed-phase suspension polymerization.

[0065] Examples of usable thickeners include hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyacrylic acid, (partially) neutralized polyacrylic acid, polyethylene glycol, polyacrylamide, polyethyleneimine, dextrin, sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, etc. If the stirring speed during polymerization is the same, the higher the viscosity of the water-soluble ethylenically unsaturated monomer aqueous solution, the larger the primary particles and / or secondary particles of the resulting particles tend to be.

[0066]

[0033] In performing the reversed-phase 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. In this case, the dispersion stabilizer (surfactant or polymeric dispersant) may be added either before or after the addition of the aqueous monomer solution, as long as it is before the start of the polymerization reaction.

[0067] Among these, from the viewpoint of easily reducing the amount of hydrocarbon dispersion medium remaining in the obtained water absorbent resin particles, it is preferable to disperse an aqueous monomer solution in a hydrocarbon dispersion medium having a polymeric dispersant dispersed therein, and then further disperse a surfactant therein, and then carry out polymerization.

[0068] The polymerization step can be carried out in one stage or in multiple stages of two or more stages. When reverse phase suspension polymerization is carried out in multiple stages of two or more stages, after the first stage of reverse phase suspension polymerization, an ethylenically unsaturated monomer is added to and mixed with the reaction mixture obtained in the first stage of polymerization reaction, and reverse phase suspension polymerization in the second stage and thereafter can be carried out in the same manner as in the first stage. In the reverse phase suspension polymerization in each stage from the second stage onwards, in addition to the ethylenically unsaturated monomer, the above-mentioned radical polymerization initiator and / or various additives may be added within the range of the ratio of each component to the above-mentioned ethylenically unsaturated monomer, based on the amount of the ethylenically unsaturated monomer added during the reverse phase suspension polymerization in each stage from the second stage onwards, to carry out the reverse phase suspension polymerization.

[0069] [Particle size adjusting step] The method for producing water-absorbent resin particles of the present invention may include a particle size adjusting step. The particle size adjusting step can be carried out, for example, by adding a flocculant such as a powdery inorganic flocculant to the system.

[0070] Examples of powdered inorganic flocculants include amorphous silica, zeolite, bentonite, aluminum oxide, talc, titanium dioxide, kaolin, clay, hydrotalcite, etc. Among these, at least one selected from the group consisting of amorphous silica, aluminum oxide, talc, and kaolin may be used because it has a high flocculating effect.

[0071] When the flocculant is added to the system, the timing of addition is, for example, between the polymerization step and the drying step described below, and / or during the surface cross-linking step described below.

[0072] The amount of the flocculant added may be 0.001 to 1 part by mass, 0.005 to 0.5 parts by mass, or 0.01 to 0.2 parts by mass, per 100 parts by mass of the water-soluble ethylenically unsaturated monomer.

[0073] The reaction temperature of the polymerization reaction is preferably 20 to 110°C, more preferably 40 to 90°C, from the viewpoints of rapidly progressing the polymerization, shortening the polymerization time, thereby improving economic efficiency, and easily removing the heat of polymerization to smoothly carry out the reaction.

[0074] <Surface cross-linking step> Next, the water-absorbent resin particles of the present invention are obtained by adding a surface cross-linking agent to a hydrogel polymer having an internal cross-linked structure obtained by polymerizing a water-soluble ethylenically unsaturated monomer to cross-link the polymer (surface cross-linking reaction). This surface cross-linking reaction is preferably carried out in the presence of a surface cross-linking agent after the polymerization of the water-soluble ethylenically unsaturated monomer. In this way, by subjecting a hydrogel polymer having an internal cross-linked structure to a surface cross-linking reaction after the polymerization, the cross-linking density near the surface of the water-absorbent resin particles can be increased, and water-absorbent resin particles having improved performance such as water absorption capacity under load can be obtained.

[0075] Examples of the surface cross-linking agent include compounds having two or more reactive functional groups. For example, polyols such as ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, triethylene glycol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol, and polyglycerin; polyglycidyl compounds such as (poly)ethylene glycol diglycidyl ether, (poly)glycerin diglycidyl ether, (poly)glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, and (poly)glycerol polyglycidyl ether; haloepoxy compounds such as epichlorohydrin, epibromohydrin, and α-methylepichlorohydrin; isocyanate compounds such as 2,4-tolylene diisocyanate and hexamethylene diisocyanate; 3-methyl-3-oxetanemethanol and 3-ethyl-3-oxetane Oxetane compounds such as methanol, 3-butyl-3-oxetanemethanol, 3-methyl-3-oxetaneethanol, 3-ethyl-3-oxetaneethanol, and 3-butyl-3-oxetaneethanol; oxazoline compounds such as 1,2-ethylenebisoxazoline; ethylene carbonate, propylene carbonate, 4,5-dimethyl-1,3-dioxolan-2-one, 4,4-dimethyl-1,3-dioxolan-2-one, 4-ethyl and hydroxyalkylamide compounds such as bis[N,N-di(β-hydroxyethyl)]adipamide. Among these surface cross-linking agents, polyglycidyl compounds such as (poly)ethylene glycol diglycidyl ether, (poly)glycerin diglycidyl ether, (poly)glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, and (poly)glycerol polyglycidyl ether are preferred.These surface cross-linking agents may be used alone or in combination of two or more.

[0076] 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 monomers used in the polymerization.

[0077] As a method for adding the surface crosslinking agent, the surface crosslinking agent may be added as it is or as an aqueous solution, or, if necessary, may be added as a solution using a hydrophilic organic solvent as a solvent. Examples of the hydrophilic organic solvent include lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, etc.; ketones such as acetone, methyl ethyl ketone, etc.; ethers such as diethyl ether, dioxane, tetrahydrofuran, etc.; amides such as N,N-dimethylformamide, etc.; sulfoxides such as dimethyl sulfoxide, etc. These hydrophilic organic solvents may be used alone, or two or more types may be used in combination, or as a mixed solvent with water.

[0078] The timing of addition of the surface crosslinking agent may be after the polymerization reaction of the water-soluble ethylenically unsaturated monomer has almost completely finished, and the surface crosslinking agent is added in the presence of water in a range of preferably 1 to 400 parts by mass, more preferably 5 to 200 parts by mass, still more preferably 10 to 100 parts by mass, and still more preferably 20 to 60 parts by mass, relative to 100 parts by mass of the water-soluble ethylenically unsaturated monomer. Note that the amount of water means the total amount of water contained in the reaction system and water used as necessary when adding the surface crosslinking agent.

[0079] The reaction temperature in the surface crosslinking reaction is preferably 50 to 250° C., more preferably 60 to 180° C., further preferably 60 to 140° C., and even more preferably 70 to 120° C. The reaction time of the surface crosslinking reaction is preferably 1 to 300 minutes, and more preferably 5 to 200 minutes.

[0080] <Drying Step> After the above-described reversed-phase suspension polymerization is performed, a drying step may be included in which water, hydrocarbon dispersion medium, and the like are removed by distillation by externally applying energy such as heat. When dehydrating the hydrous gel polymer after reversed-phase suspension polymerization, the system in which the hydrous gel polymer is dispersed in the hydrocarbon dispersion medium is heated, and the water and hydrocarbon dispersion medium are temporarily distilled out of the system by azeotropic distillation. At this time, if only the distilled hydrocarbon dispersion medium is returned to the system, continuous azeotropic distillation becomes possible. In this case, the temperature in the system during drying is maintained below the azeotropic temperature with the hydrocarbon dispersion medium, which is preferable from the viewpoint of preventing deterioration of the resin. Subsequently, water and hydrocarbon dispersion medium are distilled off to obtain water-absorbent resin particles. By controlling the treatment conditions of this drying step after polymerization to adjust the amount of dehydration, it is possible to control the various properties of the obtained water-absorbent resin particles.

[0081] In the drying step, the drying treatment by distillation may be carried out under normal pressure or under reduced pressure. Moreover, from the viewpoint of increasing the drying efficiency, it may be carried out under a gas flow such as nitrogen. When the drying treatment is carried out under normal pressure, the drying temperature is preferably 70 to 250°C, more preferably 80 to 180°C, even more preferably 80 to 140°C, and even more preferably 90 to 130°C. Moreover, when the drying treatment is carried out under reduced pressure, the drying temperature is preferably 40 to 160°C, more preferably 50 to 110°C.

[0082] In addition, when the surface cross-linking step using a surface cross-linking agent is carried out after the polymerization of monomers by reverse phase suspension polymerization, the drying step by distillation described above is carried out after the surface cross-linking step is completed. Alternatively, the surface cross-linking step and the drying step may be carried out simultaneously.

[0083] The deodorant composition of the present invention may contain additives according to the purpose. Examples of such additives include inorganic powders, surfactants, oxidizing agents, reducing agents, metal chelating agents, radical chain inhibitors, antioxidants, antibacterial agents, etc. For example, the fluidity of the deodorant composition can be further improved by adding 0.05 to 5 parts by mass of amorphous silica as inorganic powder per 100 parts by mass of water-absorbent resin particles. The additives are preferably hydrophilic or water-soluble.

[0084]

[0063] Furthermore, from the viewpoint of more suitably exhibiting the effects of the present invention, in the deodorant composition of the present invention, the content Z (mass%) of the water-absorbent resin particles is preferably 95.00 mass% or more, more preferably 98.00 mass% or more, even more preferably 99.00 mass% or more, and is preferably 99.99 mass% or less, more preferably 99.98 mass% or less, even more preferably 99.97 mass% or less, and a preferred range is 95.00 to 99.99 mass%, etc.

[0085] The deodorant composition of the present invention can be produced, for example, by mixing water-absorbent resin particles and a porous deodorant containing a halogen in a solid phase.

[0086] The deodorant composition of the present invention can be used in a wide range of deodorizing applications, and since it contains water-absorbent resin particles, it is particularly suitable for deodorizing applications where water absorption is required. As will be described later, the deodorant composition of the present invention can be suitably used, for example, for absorbents used in sanitary materials such as disposable diapers.

[0087] 2. Absorbent bodies, absorbent articles The deodorant composition of the present invention can be suitably used for absorbent bodies used in sanitary materials such as disposable diapers. When the content Z of water-absorbent resin particles in the deodorant composition of the present invention is high (for example, when the content Z (mass%) of water-absorbent resin particles in the deodorant composition of the present invention is 95.00 mass% or more), the deodorant composition of the present invention can also be used as a water-absorbent resin composition for an absorbent body. The absorbent body is suitably used for absorbent articles comprising the absorbent body. In this case, the absorbent article of the present invention comprises the deodorant composition of the present invention.

[0088] Here, the absorbent using the deodorant composition of the present invention contains the deodorant composition of the present invention. The absorbent may further contain hydrophilic fibers. Examples of the configuration of the absorbent include a sheet-like structure in which water-absorbent resin particles are fixed on a nonwoven fabric or between multiple nonwoven fabrics, a mixed dispersion obtained by mixing the deodorant composition and hydrophilic fibers to form a uniform composition, a sandwich structure in which the deodorant composition is sandwiched between layers of hydrophilic fibers, and a structure in which the deodorant composition and hydrophilic fibers are wrapped in tissue. The absorbent may also contain other components, such as adhesive binders such as heat-fusible synthetic fibers, hot-melt adhesives, and adhesive emulsions, in order to improve the shape retention of the absorbent.

[0089] The content of the deodorant composition in the absorbent is preferably 5 to 100% by mass, more preferably 10 to 95% by mass, even more preferably 20 to 90% by mass, and even more preferably 30 to 80% by mass.

[0090] Examples of hydrophilic fibers include cellulose fibers such as cotton-like pulp obtained from wood, mechanical pulp, chemical pulp, and semi-chemical pulp, artificial cellulose fibers such as rayon and acetate, and fibers made of synthetic resins such as hydrophilically treated polyamide, polyester, and polyolefin. The average fiber length of the hydrophilic fibers is usually 0.1 to 10 mm, or may be 0.5 to 5 mm.

[0091] The absorbent article of the present invention can be produced by holding an absorbent using the deodorant composition of the present invention between a liquid-permeable sheet (top sheet) through which liquid can pass and a liquid-impermeable sheet (back sheet) through which liquid cannot pass. The liquid-permeable sheet is arranged on the side that comes into contact with the body, and the liquid-impermeable sheet is arranged on the opposite side that comes into contact with the body.

[0092] Examples of liquid-permeable sheets include nonwoven fabrics such as air-through, spunbond, chemical-bond, and needle-punched types made of fibers such as polyethylene, polypropylene, and polyester, as well as porous synthetic resin sheets. Examples of liquid-impermeable sheets include synthetic resin films made of resins such as polyethylene, polypropylene, and polyvinyl chloride.

[0093] 3. Additional Notes This specification includes at least the inventions shown in (1) to (8) below: (1) A deodorant composition comprising a porous deodorant containing a halogen and water-absorbent resin particles, wherein the content of the halogen is 0.0030% by mass or more. (2) The deodorant composition according to (1) above, wherein the content of the halogen is 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. (3) The deodorant composition according to (1) or (2) above, wherein the halogen comprises at least one selected from the group consisting of bromine and chlorine. (4) The deodorant composition according to any one of (1) to (3) above, wherein the porous deodorant comprises at least one compound selected from the group consisting of activated carbon, silicon dioxide, and silicates. (5) The deodorant composition according to any one of (1) to (4) above, 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 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. (6) The deodorant composition according to any one of (1) to (5) above, wherein the sum (X+Y) of the porous deodorant content X (% by mass) and the halogen content Y (% by mass) is 0.01% by mass to 0.30% by mass, 0.01% by mass to 0.20% by mass, 0.01% by mass to 0.15% by mass, 0.05% by mass to 0.30% by mass, 0.05% by mass to 0.2% by mass, 0.05% by mass to 0.15% by mass, 0.08% by mass to 0.30% by mass, 0.08% by mass to 0.20% by mass, or 0.08% by mass to 0.15% by mass.(7) The deodorant composition according to any one of the above (1) to (6), wherein the water absorption speed of the water-absorbent resin particles as measured by a 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. (8) The deodorant composition according to any one of (1) to (7) above, wherein the porous deodorant contains a halogen, and the content of the halogen in the halogen-containing porous deodorant is 0.3% by mass to 10.0% by mass, 0.3% by mass to 8.0% by mass, 0.3% by mass to 7.0% by mass, 1.5% by mass to 10.0% by mass, 1.5% by mass to 8.0% by mass, 1.5% by mass to 7.0% by mass, 2.4% by mass to 10.0% by mass, 2.4% by mass to 8.0% by mass, or 2.4% by mass to 7.0% by mass.

[0094] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0095] The following water-absorbent resin particles, activated carbon as a porous deodorizer, and deodorant compositions obtained in the examples and comparative examples were evaluated by the following various tests. Unless otherwise specified, the measurements were carried out in an environment of a temperature of 25±2°C and a humidity of 50±10%.

[0096] [Production Examples of Water-Absorbent Resin Particles] <Production Example 1> A 2-L, 110 mm inner diameter, round-bottomed, cylindrical separable flask with four sidewall baffles (baffle width: 7 mm) was prepared, equipped with a reflux condenser, a dropping funnel, a nitrogen gas inlet tube, and a stirrer. A stirring blade with two stages of four inclined paddle blades with a blade diameter of 50 mm and surface-treated with a fluororesin was attached to the stirrer. 451.4 g of n-heptane and 1.288 g of sorbitan monolaurate (trade name: Nonion LP-20R, HLB value 8.6, manufactured by NOF Corporation) were mixed in the prepared separable flask. The mixture in the separable flask was stirred with the stirrer while being heated to 50°C, thereby dissolving the sorbitan monolaurate in n-heptane. The resulting solution was cooled to 40°C.

[0097] A 500 mL Erlenmeyer flask was charged with 92.0 g of an 80.5 wt% aqueous acrylic acid solution (1.03 mol of acrylic acid). While cooling with ice from the outside, 147.7 g of a 20.9 wt% aqueous sodium hydroxide solution was added dropwise to the aqueous acrylic acid solution in the flask to partially neutralize the acrylic acid. Next, 0.1011 g (0.374 mmol) of potassium persulfate was added as a water-soluble radical polymerization initiator and dissolved in the aqueous solution to prepare an aqueous solution.

[0098] The resulting aqueous solution was added to the separable flask containing the solution containing sorbitan monolaurate, and the atmosphere in the system was thoroughly purged with nitrogen. The reaction solution in the separable flask was kept in a hot water bath at 70°C for 60 minutes while stirring at a stirrer speed of 700 rpm, thereby allowing the polymerization reaction to proceed.

[0099] A dispersion of 0.092 g of amorphous silica (Toxil NP-S, Oriental Silicas Corporation) dispersed in 100 g of n-heptane was added to the reaction solution containing the hydrous gel polymer produced by the polymerization reaction, 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 extracted from the system by azeotropic distillation. Thereafter, 4.14 g of a 2% by mass aqueous solution of ethylene glycol diglycidyl ether (ethylene glycol diglycidyl ether: 0.475 mmol) was added as a surface crosslinking agent, and the surface crosslinking reaction was allowed to proceed by maintaining the internal temperature at 80±2°C for 2 hours.

[0100] The reaction solution was heated to 125°C to evaporate water and n-heptane, thereby obtaining a dried product of water-absorbent resin particles. This dried product was passed through a sieve with an opening of 850 µm, thereby obtaining 86.3 g of water-absorbent resin particles. The physiological saline water retention capacity of the water-absorbent resin particles was 37 g / g, the water absorption rate was 3 seconds, the median particle diameter was 361 µm, and the physiological saline water absorption capacity under a load of 4.14 kPa was 11 ml / g.

[0101] <Production Example 2> A round-bottomed cylindrical separable flask with an inner diameter of 11 cm and a capacity of 2 L was prepared, equipped with a reflux condenser, a dropping funnel, a nitrogen gas inlet tube, and a stirring blade with two stages of four inclined paddle blades with a blade diameter of 5 cm. 293 g of n-heptane was added to this flask as a hydrocarbon dispersion medium, and 0.736 g of maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hiwax 1105A) was added as a polymer dispersant. The mixture was heated to 80 ° C. with stirring to dissolve the dispersant, and then cooled to 50 ° C. Separately, 92.0 g (1.03 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in a 300 mL beaker, and while cooling with ice water, 147.7 g of a 20.9 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization. Thereafter, 0.092 g of hydroxyl ethyl cellulose (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) as a thickener, 0.0736 g (0.272 mmol) of potassium persulfate as a water-soluble radical polymerization agent, and 0.010 g (0.057 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a first-stage aqueous liquid. The aqueous liquid prepared above was then added to a separable flask and stirred for 10 minutes. A surfactant solution prepared by heating and dissolving 0.736 g of sucrose stearate with an HLB of 3 (Ryoto Sugar Ester S-370, Mitsubishi-Kagaku Foods Corporation) as a surfactant in 6.62 g of n-heptane in a 20 mL vial was then added, and the system was thoroughly purged with nitrogen while stirring at a stirrer rotation speed of 550 rpm. The flask was then immersed in a water bath at 70°C to raise the temperature, and polymerization was carried out for 60 minutes, thereby obtaining a first-stage polymerization slurry.

[0102] On the other hand, 128.8 g (1.43 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in another 500 mL beaker, and while cooling with ice water, 159.0 g of a 27 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization, and then 0.103 g (0.381 mmol) of potassium persulfate as a water-soluble radical polymerization initiator and 0.0117 g (0.067 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a second-stage aqueous liquid.

[0103] The contents of the separable flask system were cooled to 27°C while stirring at a stirrer speed of 1000 rpm, and then the entire amount of the second-stage aqueous liquid was added to the first-stage polymerization slurry liquid. The atmosphere in the system was replaced with nitrogen for 30 minutes, and the flask was again immersed in a water bath at 70°C to raise the temperature, and a polymerization reaction was carried out for 60 minutes to obtain a hydrogel polymer.

[0104] Thereafter, the flask was immersed in an oil bath set to 125°C, and 259.9 g of water was extracted from the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. Thereafter, 4.42 g (0.507 mmol) of a 2 mass% aqueous solution of ethylene glycol diglycidyl ether was added as a surface crosslinking agent to the flask, and the mixture was maintained at 83°C for 2 hours.

[0105] Thereafter, n-heptane was evaporated at 125°C to dry the mixture, and the mixture was passed through a sieve with an opening of 850 µm to obtain 220.4 g of water-absorbent resin particles. The water-absorbent resin particles had a saline water retention capacity of 40 g / g, a water absorption rate of 32 seconds, a median particle diameter of 278 µm, and a saline water absorption capacity of 20 ml / g under a load of 4.14 kPa.

[0106] <Production Example 3> A round-bottomed cylindrical separable flask with an inner diameter of 11 cm and a capacity of 2 L was prepared, equipped with a reflux condenser, a dropping funnel, a nitrogen gas inlet tube, and a stirring blade with two stages of four inclined paddle blades with a blade diameter of 5 cm. 293 g of n-heptane was added to this flask as a hydrocarbon dispersion medium, and 0.736 g of maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hiwax 1105A) was added as a polymer dispersant. The mixture was heated to 80 ° C. with stirring to dissolve the dispersant, and then cooled to 50 ° C. Separately, 92.0 g (1.03 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in a 300 mL beaker, and while cooling with ice water, 147.7 g of a 20.9 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization. Thereafter, 0.092 g of hydroxyl ethyl cellulose (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) as a thickener, 0.0736 g (0.272 mmol) of potassium persulfate as a water-soluble radical polymerization agent, and 0.010 g (0.057 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a first-stage aqueous liquid. The aqueous liquid prepared above was then added to a separable flask and stirred for 10 minutes. A surfactant solution prepared by heating and dissolving 0.736 g of sucrose stearate with an HLB of 3 (Ryoto Sugar Ester S-370, Mitsubishi-Kagaku Foods Corporation) as a surfactant in 6.62 g of n-heptane in a 20 mL vial was then added, and the system was thoroughly purged with nitrogen while stirring at a stirrer rotation speed of 550 rpm. The flask was then immersed in a water bath at 70°C to raise the temperature, and polymerization was carried out for 60 minutes, thereby obtaining a first-stage polymerization slurry.

[0107] On the other hand, 128.8 g (1.43 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in another 500 mL beaker, and while cooling with ice water, 159.0 g of a 27 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization, and then 0.103 g (0.381 mmol) of potassium persulfate as a water-soluble radical polymerization initiator and 0.0117 g (0.067 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a second-stage aqueous liquid.

[0108] The contents of the separable flask system were cooled to 25°C while stirring at a stirrer speed of 1000 rpm, and then the entire amount of the second-stage aqueous liquid was added to the first-stage polymerization slurry liquid. The atmosphere in the system was replaced with nitrogen for 30 minutes, and the flask was again immersed in a water bath at 70°C to raise the temperature, and a polymerization reaction was carried out for 60 minutes to obtain a hydrogel polymer.

[0109] Thereafter, the flask was immersed in an oil bath set to 125°C, and 259.9 g of water was extracted from the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. Thereafter, 4.42 g (0.507 mmol) of a 2 mass% aqueous solution of ethylene glycol diglycidyl ether was added as a surface crosslinking agent to the flask, and the mixture was maintained at 83°C for 2 hours.

[0110] Thereafter, n-heptane was evaporated at 125°C to dry the mixture, and the mixture was passed through a sieve with an opening of 850 µm to obtain 226.1 g of water-absorbent resin particles. The water-absorbent resin particles had a saline water retention capacity of 42 g / g, a water absorption rate of 42 seconds, a median particle diameter of 366 µm, and a saline water absorption capacity of 20 ml / g under a load of 4.14 kPa.

[0111] <Production Example 4> A round-bottomed cylindrical separable flask with an inner diameter of 11 cm and a capacity of 2 L was prepared, equipped with a reflux condenser, a dropping funnel, a nitrogen gas inlet tube, and a stirring blade with two stages of four inclined paddle blades with a blade diameter of 5 cm. 293 g of n-heptane was added to this flask as a hydrocarbon dispersion medium, and 0.736 g of maleic anhydride-modified ethylene-propylene copolymer (Mitsui Chemicals, Inc., Hiwax 1105A) was added as a polymer dispersant. The mixture was heated to 80 ° C. with stirring to dissolve the dispersant, and then cooled to 50 ° C. Separately, 92.0 g (1.03 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in a 300 mL beaker, and while cooling with ice water, 147.7 g of a 20.9 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization. Thereafter, 0.092 g of hydroxyl ethyl cellulose (Sumitomo Seika Chemicals Co., Ltd., HEC AW-15F) as a thickener, 0.0736 g (0.272 mmol) of potassium persulfate as a water-soluble radical polymerization agent, and 0.010 g (0.057 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a first-stage aqueous liquid. The aqueous liquid prepared above was then added to a separable flask and stirred for 10 minutes. A surfactant solution prepared by heating and dissolving 0.736 g of sucrose stearate with an HLB of 3 (Ryoto Sugar Ester S-370, Mitsubishi-Kagaku Foods Corporation) as a surfactant in 6.62 g of n-heptane in a 20 mL vial was then added, and the system was thoroughly purged with nitrogen while stirring at a stirrer rotation speed of 550 rpm. The flask was then immersed in a water bath at 70°C to raise the temperature, and polymerization was carried out for 60 minutes, thereby obtaining a first-stage polymerization slurry.

[0112] On the other hand, 128.8 g (1.43 mol) of an 80.5 mass% aqueous acrylic acid solution as a water-soluble ethylenically unsaturated monomer was placed in another 500 mL beaker, and while cooling with ice water, 159.0 g of a 27 mass% aqueous sodium hydroxide solution was added dropwise to carry out 75 mol% neutralization, and then 0.103 g (0.381 mmol) of potassium persulfate as a water-soluble radical polymerization initiator and 0.0117 g (0.067 mmol) of ethylene glycol diglycidyl ether as an internal crosslinking agent were added and dissolved to prepare a second-stage aqueous liquid.

[0113] The contents of the separable flask system were cooled to 23°C while stirring at a stirrer speed of 1000 rpm, and then the entire amount of the second-stage aqueous liquid was added to the first-stage polymerization slurry liquid. The atmosphere in the system was replaced with nitrogen for 30 minutes, and the flask was again immersed in a water bath at 70°C to raise the temperature, and a polymerization reaction was carried out for 60 minutes to obtain a hydrogel polymer.

[0114] Thereafter, the flask was immersed in an oil bath set to 125°C, and 259.9 g of water was extracted from the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. Thereafter, 4.42 g (0.507 mmol) of a 2 mass% aqueous solution of ethylene glycol diglycidyl ether was added as a surface crosslinking agent to the flask, and the mixture was maintained at 83°C for 2 hours.

[0115] Thereafter, n-heptane was evaporated at 125°C to dry the mixture, and the mixture was passed through a sieve with an opening of 850 µm to obtain 226.1 g of water-absorbent resin particles. The water-absorbent resin particles had a saline water retention capacity of 42 g / g, a water absorption rate of 45 seconds, a median particle diameter of 389 µm, and a saline water absorption capacity of 20 ml / g under a load of 4.14 kPa.

[0116] [Evaluation of Water-Absorbent Resin Particles] <Water Absorption Amount of Physiological Saline Solution Under a Load of 4.14 kPa> The water absorption amount of physiological saline solution under a load of 4.14 kPa (water absorption amount under load) was measured using a measuring device outlined in FIG. 1 . The measurement was performed twice for one type of water-absorbent resin particle, and the average value was calculated. The measuring device includes a burette unit 1, a clamp 3, a conduit 5, a stand 11, a measurement table 13, and a measurement unit 4 placed on the measurement table 13. The burette unit 1 includes a burette tube 21 having a scale, a rubber stopper 23 that seals the opening at the top of the burette tube 21, a cock 22 connected to the tip of the bottom of the burette tube 21, and an air introduction tube 25 and a cock 24 connected to the bottom of the burette tube 21. The burette unit 1 is fixed with a clamp 3. The flat measurement table 13 has a through-hole 13a with a diameter of 2 mm formed in its center, and is supported by a height-adjustable stand 11. The through hole 13a of the measuring table 13 and the cock 22 of the burette part 1 are connected by a conduit 5. The inner diameter of the conduit 5 is 6 mm.

[0117] The measurement unit 4 has a Plexiglas cylinder 31, a polyamide mesh 32 adhered to one opening of the cylinder 31, and a weight 33 that is movable up and down within the cylinder 31. The cylinder 31 is placed on the measurement table 13 via the polyamide mesh 32. The inner diameter of the cylinder 31 is 20 mm. The opening of the polyamide mesh 32 is 75 μm (200 mesh). The weight 33 has a diameter of 19 mm and a mass of 119.6 g, and 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, as will be described later.

[0118] First, the stopcocks 22 and 24 of the burette part 1 were closed, and 0.9% by mass physiological saline solution adjusted to 25°C was poured into the burette tube 21 through the opening at the top of the burette tube 21. Next, the top opening of the burette tube 21 was sealed with a rubber stopper 23, and then the stopcocks 22 and 24 were opened. The inside of the conduit 5 was filled with 0.9% by mass saline solution 50 while preventing the inclusion of air bubbles. The height of the measurement table 13 was adjusted so that the height of the water surface of the 0.9% by mass saline solution 50 that had reached the through-hole 13a was the same as the height of the upper surface of the measurement table 13. After the adjustment, the height of the water surface of the 0.9% by mass saline solution 50 in the burette tube 21 was read on the scale of the burette tube 21, and this position was designated as the zero point (the reading at 0 seconds).

[0119] In the measurement unit 4, 0.10 g of water-absorbent resin particles 10a were uniformly arranged on the polyamide mesh 32 in the cylinder 31, a weight 33 was placed on the water-absorbent resin particles 10a, and the cylinder 31 was installed so that its center coincided with the conduit opening at the center of the measurement table 13. The amount of reduced saline in the burette tube 21 (i.e., the amount of saline absorbed by the water-absorbent resin particles 10a) Wc (ml) 60 minutes after the water-absorbent resin particles 10a started to absorb saline from the conduit 5 was read, and the saline absorption capacity of the water-absorbent resin particles 10a under a load of 4.14 kPa was calculated by the following formula: saline absorption capacity under a load of 4.14 kPa (ml / g) = Wc (ml) / mass of water-absorbent resin particles (g)

[0120] <Measurement of Water Absorption Rate by Vortex Method> 50±0.1 g of physiological saline adjusted to a temperature of 25±0.2°C in a thermostatic water bath was weighed into a 100 ml beaker and stirred with a magnetic stir bar (8 mmφ×30 mm without ring) to generate a vortex at a rotation speed of 600 rpm. 2.0±0.002 g of water-absorbent resin particles were added to the physiological saline at once, and the time (seconds) from the addition of the water-absorbent resin particles to the time when the vortex on the liquid surface converged was measured, and this time was taken as the water absorption rate of the water-absorbent resin particles. This water absorption rate is also expressed as the Vortex method or vortex time.

[0121] <Median particle diameter (particle size distribution) of water-absorbent resin particles> 50.0 g of water-absorbent resin particles were used for measuring the median particle diameter (particle size distribution). JIS standard sieves were combined in the following order from top to bottom: a sieve with an opening of 850 μm, a sieve with an opening of 500 μm, a sieve with an opening of 425 μm, a sieve with an opening of 300 μm, a sieve with an opening of 250 μm, a sieve with an opening of 180 μm, a sieve with an opening of 150 μm, and a tray. Water-absorbent resin particles were placed on the top sieve and shaken for 20 minutes using a rotary shaker for classification. After classification, the mass of the water-absorbent resin particles remaining on each sieve was calculated as a mass percentage relative to the total amount to determine the particle size distribution. With regard to this particle size distribution, the particles remaining on the sieve were integrated in order from the largest particle diameter, and the relationship between the sieve opening and the integrated value of the mass percentage of the water absorbent resin particles remaining on the sieve was plotted on a logarithmic probability paper. By connecting the plots on the probability paper with a straight line, the particle diameter corresponding to an integrated mass percentage of 50 mass% was determined to be the median particle diameter.

[0122] [Preparation of Porous Deodorant] The following activated carbons A and B were prepared as porous deodorants: Activated carbon A is activated carbon containing bromine molecules as halogen, and activated carbon B is activated carbon containing no halogen.

[0123] <Activated carbon A> Activated carbon (GS2x4 / 6S) manufactured by Osaka Gas Chemicals was crushed in a mortar and passed through a sieve with 83 μm openings to obtain activated carbon A. This activated carbon had a median particle size of 48 μm and a bromine content of 6%.

[0124] <Activated Carbon B> Activated carbon (GH2x4 / 6S) manufactured by Osaka Gas Chemicals was crushed in a mortar and passed through a sieve with 83 μm openings to obtain activated carbon B. This activated carbon had a median particle size of 56 μm and a bromine content of 0%.

[0125] [Evaluation of Porous Deodorant] <Median Particle Diameter of Activated Carbon (Laser Diffraction)> The median particle diameter (D50 (median diameter), volume basis) of the activated carbon used was measured using a laser diffraction particle size distribution analyzer (Shimadzu Corporation, SALD2300).

[0126] <Measurement of bromine content in activated carbon> A combustion improver was added to 0.5 mg of activated carbon, and the resulting gas was collected in 10 mL of absorption liquid. 5 mL of ultrapure water was added to this absorption liquid, and the resulting mixture was measured using a Thermo Fisher Scientific ICS-5000. Note that samples with high bromine concentrations were diluted with ultrapure water before measurement.

[0127] [Production of deodorant composition] Example 1 A deodorant composition was obtained by adding 0.1 parts by mass of activated carbon A to 100 parts by mass of the water absorbent resin particles of Production Example 1, and mixing for 30 minutes (conditions: revolution speed 50 rpm, rotation speed 50 rpm) using a cross rotary mixer manufactured by Meiwa Kogyo Co., Ltd. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and the concentration of methyl mercaptan was found to be 9 ppm.

[0128] <Example 2> A deodorant composition was obtained by the same operation as in Example 1, except for using the water absorbent resin particles of Production Example 2. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was found to be 10 ppm.

[0129] Example 3 A deodorant composition was obtained by the same operation as in Example 1, except for using the water absorbent resin particles of Production Example 3. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was found to be 12 ppm.

[0130] Example 4 A deodorant composition was obtained by the same operation as in Example 1, except for using the water absorbent resin particles of Production Example 4. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was 13 ppm.

[0131] Example 5 A deodorant composition was obtained by the same operation as in Example 1, except that 0.2 parts by mass of activated carbon A was added to 100 parts by mass of the water absorbent resin particles of Production Example 2. Using 3 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was found to be 12 ppm.

[0132] <Comparative Example 1> A deodorant composition was obtained by the same operation as in Example 1, except that the activated carbon added to the water absorbent resin particles was changed to activated carbon B. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was found to be 15 ppm.

[0133] <Comparative Example 2> A deodorant composition was obtained by the same operation as in Example 4, except that the activated carbon added to the water absorbent resin particles was changed to activated carbon B. Using 6 g of this deodorant composition, a deodorization test described below was carried out, and as a result, the concentration of methyl mercaptan was found to be 15 ppm.

[0134] Comparative Example 3 A deodorization test described below was carried out using only 0.006 mg of activated carbon A without using water-absorbent resin particles, and the concentration of methyl mercaptan was 17 ppm.

[0135] Comparative Example 4 A deodorization test described below was carried out using only 0.006 mg of activated carbon B without using water-absorbent resin particles, and the concentration of methyl mercaptan was 15 ppm.

[0136] Comparative Example 5 A deodorization test described below was carried out using only 6 g of the water-absorbent resin particles of Production Example 1 without using activated carbon. The concentration of methyl mercaptan was 17 ppm.

[0137] Comparative Example 6 A deodorization test was carried out without using water-absorbent resin particles and activated carbon, with a petri dish containing only artificial urine placed in a sampling bag, and the methyl mercaptan concentration was found to be 17 ppm.

[0138] Reference Example 1 A deodorization test was carried out without using water-absorbent resin particles, activated carbon, or artificial urine, with only the petri dish placed in the sampling bag, and the methyl mercaptan concentration was found to be 20 ppm.

[0139] [Deodorization Test] 20.0 g of urea, 8.0 g of sodium chloride, 0.3 g of calcium chloride dihydrate, and 0.8 g of magnesium sulfate heptahydrate were added to 970.0 g of distilled water to prepare artificial urine. A predetermined amount of the deodorant composition was placed in a sterile plastic dish with an inner diameter of 70 mm, and 20 mL of artificial urine was added. The plastic dish was sealed in a 2 L polyester sampling bag (GL Science Co., Ltd., PAAAK2), and the air inside the bag was removed using a syringe, followed by standing for 3 hours. After standing for 3 hours, 900 mL of air containing 20 ppm of methyl mercaptan was sealed in the smart bag and allowed to stand for 1 hour. After 1 hour, the methyl mercaptan concentration in the gas phase inside the smart bag was measured using a No. 71 detector tube (GL Science Co., Ltd.).

[0140]

[0141] As shown in Table 1, the deodorant compositions of Examples 1-5 comprise a halogen-containing porous deodorant and water-absorbent resin particles, and have a halogen content of 0.0030% by mass or more. In a deodorization test conducted in an environment where artificial urine containing a polyvalent metal salt and methyl mercaptan coexisted, the deodorant compositions of Examples 1-5 were found to have an excellent deodorizing effect on methyl mercaptan. These results suggest that the polyvalent metal salt contained in urine is rapidly absorbed by the water-absorbent resin particles, thereby suppressing the reaction between the halogen molecules of the porous deodorant and the polyvalent metal salt in the urine, and that the halogen-containing porous deodorant exhibits a high deodorizing effect on methyl mercaptan, which is contained in large amounts in feces.

[0142] REFERENCE SIGNS LIST 1 burette part 3 clamp 4 measuring part 5 conduit 10a water-absorbent resin particles 11 stand 13 measuring table 13a through-hole 21 burette tube 22 cock 23 rubber stopper 24 cock 25 air introduction tube 31 cylinder 32 polyamide mesh 33 weight 50 saline solution

Claims

1. A deodorant composition comprising a halogen-containing porous deodorant and water-absorbent resin particles, the halogen content being 0.0030 mass% or more.

2. The deodorant composition according to claim 1, wherein the halogen comprises 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 comprises at least one compound selected from the group consisting of activated carbon, zeolite, silicon dioxide and silicates.

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

5. The deodorant composition according to claim 1 or 2, wherein the water-absorbing resin particles have a water-absorbing speed measured by a Vortex method of 50 seconds or less.

6. An absorbent article comprising the deodorant composition according to claim 1 or 2.