WO2023100845A1 - 吸収性物品 - Google Patents

吸収性物品 Download PDF

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Publication number
WO2023100845A1
WO2023100845A1 PCT/JP2022/043885 JP2022043885W WO2023100845A1 WO 2023100845 A1 WO2023100845 A1 WO 2023100845A1 JP 2022043885 W JP2022043885 W JP 2022043885W WO 2023100845 A1 WO2023100845 A1 WO 2023100845A1
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WO
WIPO (PCT)
Prior art keywords
water
resin particles
liquid
absorbent
activated carbon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/043885
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
朋依 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Seika Chemicals Co Ltd
Original Assignee
Sumitomo Seika Chemicals Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Seika Chemicals Co Ltd filed Critical Sumitomo Seika Chemicals Co Ltd
Priority to JP2023564989A priority Critical patent/JPWO2023100845A1/ja
Priority to KR1020247017554A priority patent/KR20240110948A/ko
Priority to CN202280078461.3A priority patent/CN118302141A/zh
Priority to EP22901277.8A priority patent/EP4442230A4/en
Publication of WO2023100845A1 publication Critical patent/WO2023100845A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
    • A61F2013/8408—Additives, e.g. for odour, disinfectant or pH control with odour control
    • A61F2013/842—Additives, e.g. for odour, disinfectant or pH control with odour control with active charcoal

Definitions

  • the present invention relates to absorbent articles, and more particularly to absorbent articles suitably used as sanitary materials such as paper diapers, sanitary napkins, and incontinence pads.
  • absorbent articles using water-absorbing resin have been widely used in the field of sanitary materials such as paper diapers, sanitary napkins, and incontinence pads.
  • the water-absorbing resin a partially neutralized salt polymer cross-linked product of acrylic acid has excellent water-absorbing ability, and the raw material acrylic acid is easily available industrially, so that the quality is constant and inexpensive. It is considered to be a preferable water-absorbing resin because it can be manufactured and has many advantages such as resistance to putrefaction and deterioration.
  • absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads consist mainly of an absorbent body that absorbs and retains body fluids such as urine and menstrual blood excreted from the body, It is composed of a liquid-permeable surface sheet (top sheet) arranged on the side in contact with the body and a liquid-impermeable back sheet (back sheet) arranged on the opposite side in contact with the body.
  • the absorber is usually composed of water-absorbing resin particles and hydrophilic fibers such as pulp.
  • absorbents When such absorbents are used as sanitary materials, for example, unpleasant odors such as acetaldehyde may be generated from the absorbents that have absorbed body fluids, especially urine, blood, sweat, and the like.
  • unpleasant odors such as acetaldehyde may be generated from the absorbents that have absorbed body fluids, especially urine, blood, sweat, and the like.
  • a method of suppressing the unpleasant odor generated from the absorbent for example, a method of using an organic amine compound as an acetaldehyde adsorbent is known.
  • activated carbon is known as an adsorbent that has an excellent deodorizing effect against a wide range of odors. Accordingly, the present inventors attempted to combine water absorbent resin particles and activated carbon to impart a deodorizing effect to absorbent articles.
  • the main object of the present invention is to provide an absorbent article containing water-absorbing resin particles and activated carbon and having an excellent deodorizing effect.
  • the inventors have diligently studied to solve the above problems. As a result, by placing an absorbent containing water-absorbing resin particles and activated carbon between a liquid-permeable sheet and a liquid-impermeable sheet, and using absorbent resin particles having a predetermined heat generation rate, , the deodorant effect is enhanced.
  • the present invention is an invention that has been completed through extensive research based on such findings.
  • Section 1 An absorbent article comprising at least a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body and activated carbon disposed between the liquid-permeable sheet and the liquid-impermeable sheet,
  • the absorber contains water-absorbing resin particles
  • the absorbent article, wherein the water-absorbent resin particles have a heat release rate of 0.10° C./second or more and 1.00° C./second or less as measured by the heat release rate measurement method described below.
  • 50 g of physiological saline at 24.9° C. is put into a cylindrical adiabatic container with a capacity of 300 mL and stirred at 600 rpm.
  • the absorbent article according to Item 1 wherein when the absorbent body is viewed in plan, the activated carbon per unit area in that region is 0.025 g/m 2 or more and 7.000 g/m 2 or less.
  • FIG. 1 is an example of a schematic cross-sectional view of an absorbent article
  • FIG. It is the schematic of the measuring apparatus of the physiological saline water absorption amount under 4.14 kPa load.
  • the term “comprising” includes “consisting essentially of” and “consisting of”.
  • (meth)acryl means “acryl or methacryl”
  • (meth)acrylate means “acrylate or methacrylate”.
  • water-soluble means exhibiting a solubility of 5% by mass or more in water at 25°C.
  • a numerical value connected with "-" means a numerical range including the numerical values before and after "-" as lower and upper limits. If multiple lower limits and multiple upper limits are listed separately, any lower limit and upper limit can be selected and connected with "-".
  • the absorbent article of the present invention has an absorbent body and activated carbon arranged between a liquid-permeable sheet and a liquid-impermeable sheet.
  • the liquid-permeable sheet is arranged on the outermost side on the side into which the liquid to be absorbed penetrates.
  • the liquid-impermeable sheet is arranged on the outermost side opposite to the side into which the liquid to be absorbed penetrates.
  • the absorbent article of the present invention can include a core wrap or the like for retaining the shape of the absorbent, in addition to the liquid-permeable sheet, absorbent, activated carbon, and liquid-impermeable sheet, if necessary.
  • Absorbent articles include diapers (for example, disposable diapers), toilet training pants, incontinence pads, sanitary materials (sanitary napkins, tampons, etc.), perspiration pads, pet sheets, animal excrement disposal materials, and the like.
  • the absorbent article may be disposable.
  • an absorbent and activated carbon are arranged between a liquid-permeable sheet and a liquid-impermeable sheet, and the absorbent has a heat release rate measured by the heat release rate measurement method described below. It is characterized by containing water-absorbing resin particles having a temperature of 0.10° C./second or more and 1.00° C./second or less.
  • the absorbent article of the present invention exhibits an excellent deodorant effect by being provided with such a configuration. Specific contents of the water absorbent resin particles will be described later.
  • Example 2 50 g of physiological saline at 24.9° C. is put into a cylindrical adiabatic container with a capacity of 300 mL and stirred at 600 rpm. 10 g of water-absorbing resin particles are added to the heat-insulating container while the physiological saline is being stirred, and the heat-insulating container is sealed with a cork stopper having a thermometer. The time required for the temperature of the physiological saline to rise by 2.0° C. after the water-absorbing resin particles are added is measured, and the heat generation rate per second is calculated as the heat generation rate.
  • the absorber and activated carbon should be placed between the liquid permeable sheet and the liquid impermeable sheet.
  • the activated carbon may be arranged in a state of being mixed with the water-absorbent resin particles in the absorbent, may be arranged between the absorbent and the liquid-permeable sheet, or may be arranged between the absorbent and the liquid-permeable sheet. It may be arranged between the impermeable sheet and at least one of them.
  • the area containing the activated carbon has a basis weight per unit area of preferably 0.001 g/m 2 .
  • the area containing the activated carbon has a basis weight per unit area of preferably 0.001 g/m 2 .
  • the area of the region containing the activated carbon may be the area of a member capable of containing the activated carbon, such as a liquid permeable sheet or a liquid impermeable sheet. may be an area of
  • FIG. 1 is a cross-sectional view showing an example of an absorbent article 100.
  • the absorbent article 100 shown in FIG. 1 includes an absorbent body 10, a core wrap 20, a liquid permeable sheet 30, and a liquid impermeable sheet 40. As shown in FIG. In the absorbent article 100, the liquid-impermeable sheet 40, the absorbent body 10 whose outer periphery is covered with the core wrap 20, and the liquid-permeable sheet 30 are laminated in this order.
  • FIG. 1 shows a schematic diagram of the absorbent body 10 containing water absorbent resin particles 10a and activated carbon 10c.
  • the absorbent body 10 has water-absorbing resin particles 10a and a fiber layer 10b containing hydrophilic fibers, which is preferably used.
  • the absorbent body 10 may or may not contain hydrophilic fibers.
  • the water absorbent resin particles 10a are, for example, supported and dispersed in the fiber layer 10b.
  • the structure of the absorbent body 10 includes a sheet-like structure in which water-absorbing resin particles are fixed on a nonwoven fabric or between a plurality of nonwoven fabrics, and the water-absorbing resin particles and hydrophilic fibers are mixed so as to have a uniform composition.
  • a mixed dispersion obtained by, a sandwich structure in which water-absorbing resin particles are sandwiched between layered hydrophilic fibers obtained by pressing finely pulverized hydrophilic fibers, etc., water-absorbing resin particles and hydrophilic Examples include a structure in which fibers are wrapped in tissue.
  • the planar shape of the absorbent body 10 is appropriately determined according to the application or the shape of the absorbent article.
  • the absorbent body may have notches or the like.
  • the internal structure of the absorbent body 10 is also appropriately determined according to the purpose. For example, in addition to being composed of a single absorbent body, a plurality of absorbent bodies (divided on the plane, divided in the vertical direction, etc.) may be combined, or water absorbent resin particles and other (uniform distribution, quantitative distribution depending on the liquid input portion, etc.).
  • the basis weight of the water absorbent resin particles in the absorbent body 10 is, for example, 50 g/m 2 or more and 700 g/m 2 or less. From the viewpoint of exhibiting the effects of the present invention more preferably, the basis weight is preferably 100 g/m 2 or more, more preferably 120 g/m 2 or more, still more preferably 140 g/m 2 or more, and preferably 600 g. /m 2 or less, more preferably 500 g/m 2 or less, and even more preferably 400 g/m 2 or less.
  • the content of the water-absorbing resin particles in the absorbent body is preferably 5 to 100% by mass, more preferably 10 to 95% by mass, even more preferably 20 to 90% by mass, and 30 to 80% by mass is even more preferable.
  • the hydrophilic fiber includes at least one selected from the group consisting of pulverized wood pulp, cotton, cotton linter, rayon, cellulose acetate, polyamide, polyester and polyolefin. More specifically, synthesis of cellulose fibers such as flocculent pulp, mechanical pulp, chemical pulp, and semi-chemical pulp obtained from wood, artificial cellulose fibers such as rayon and acetate, and hydrophilically treated polyamide, polyester, polyolefin, and the like. Examples include fibers made of resin.
  • the average fiber length of the hydrophilic fibers is typically 0.1-10 mm, or may be 0.5-5 mm.
  • the absorber may further contain additives such as inorganic powders other than activated carbon (for example, amorphous silica), deodorants, pigments, dyes, antibacterial agents, fragrances, and adhesives. These additives can impart various functions to the absorbent.
  • the absorber may contain inorganic powder separately from the inorganic particles in the water absorbent resin particles. Examples of inorganic powders include silicon dioxide, zeolite, kaolin and clay.
  • the liquid-permeable sheet 30 is arranged on the outermost side on the side into which the liquid to be absorbed enters.
  • the liquid-permeable sheet 30 is arranged on the core wrap 20 in contact with the core wrap 20, for example.
  • the absorbent body 10 can be shape-retained by enclosing it in the core wrap 20 .
  • An adhesive binder may be blended in order to enhance the shape retention before and during use of the absorbent body.
  • the liquid-impermeable sheet 40 is arranged on the outermost side of the absorbent article 100 opposite to the liquid-permeable sheet 30 .
  • the liquid impermeable sheet 40 is arranged below the core wrap 20 while being in contact with the core wrap 20 .
  • the liquid permeable sheet 30 and the liquid impermeable sheet 40 have, for example, main surfaces wider than the main surface of the absorbent body 10, and the outer edges of the liquid permeable sheet 30 and the liquid impermeable sheet 40 are It extends around the absorber 10 and the core wrap 20 .
  • the size relationship between the absorber 10, the core wrap 20 provided as necessary, the liquid permeable sheet 30, and the liquid impermeable sheet 40 is not particularly limited, and is appropriately adjusted according to the use of the absorbent article. .
  • the liquid-permeable sheet 30 may be a sheet made of resin or fiber commonly used in the technical field.
  • the liquid-permeable sheet 30 is made of, for example, polyolefins such as polyethylene (PE) and polypropylene (PP), polyethylene terephthalate (PET), polytriphthalate, etc., from the viewpoint of liquid permeability, flexibility and strength when used in absorbent articles.
  • Polyester such as methylene terephthalate (PTT) and polyethylene naphthalate (PEN), polyamide such as nylon, synthetic resin such as rayon, regenerated fiber such as cupra, acetate, or synthetic fiber containing these synthetic resins.
  • it may be a natural fiber including cotton, silk, hemp, or pulp (cellulose).
  • the liquid permeable sheet 30 may contain synthetic fibers.
  • Synthetic fibers may in particular be polyolefin fibers, polyester fibers or combinations thereof. These materials may be used alone, or two or more materials may be used in combination.
  • the liquid-permeable sheet 30 may be a nonwoven fabric, a porous sheet, or a combination thereof.
  • a nonwoven is a sheet in which fibers are intertwined without being woven.
  • the nonwoven fabric may be a nonwoven fabric (short fiber nonwoven fabric) composed of short fibers (ie, staple) or a nonwoven fabric (long fiber nonwoven fabric) composed of long fibers (ie, filaments).
  • the staple may generally have a fiber length of several hundred mm or less, although not limited thereto.
  • the liquid-permeable sheet 30 is a thermal-bonded nonwoven fabric, an air-through nonwoven fabric, a resin-bonded nonwoven fabric, a spunbonded nonwoven fabric, a melt-blown nonwoven fabric, an air-laid nonwoven fabric, a spunlaced nonwoven fabric, a point-bonded nonwoven fabric, or a laminate of two or more types of nonwoven fabrics selected from these. It's okay.
  • These non-woven fabrics can be made, for example, of the synthetic or natural fibers mentioned above.
  • the laminate of two or more types of nonwoven fabrics may be, for example, a spunbond/meltblown/spunbond nonwoven fabric, which is a composite nonwoven fabric in which a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric are laminated in this order.
  • the liquid-permeable sheet 30 may be a thermal-bond nonwoven fabric, an air-through nonwoven fabric, a spunbond nonwoven fabric, or a spunbond/meltblown/spunbond nonwoven fabric from the viewpoint of liquid leakage suppression.
  • the nonwoven fabric used as the liquid permeable sheet 30 preferably has moderate hydrophilicity from the viewpoint of the liquid absorption performance of the absorbent article. From that point of view, the liquid permeable sheet 30 is tested according to Paper Pulp Test Method No. 2 by the Japan Pulp and Paper Technology Association. 68 (2000), a hydrophilicity of 5 to 200. The hydrophilicity of the nonwoven fabric may be 10-150. Paper pulp test method no. 68 can be referred to, for example, WO2011/086843.
  • the non-woven fabric having hydrophilicity as described above may be formed of fibers showing moderate hydrophilicity such as rayon fibers, or may be made of hydrophobic chemical fibers such as polyolefin fibers and polyester fibers that are made hydrophilic. It may be formed by fibers obtained by processing.
  • Methods for obtaining a nonwoven fabric containing hydrophobic chemical fibers that have been hydrophilized include, for example, a method of obtaining a nonwoven fabric by a spunbond method using a mixture of hydrophobic chemical fibers and a hydrophilizing agent; Examples include a method of entraining a hydrophilizing agent when producing a spunbond nonwoven fabric from fibers, and a method of impregnating a spunbond nonwoven fabric obtained using hydrophobic chemical fibers with a hydrophilizing agent.
  • hydrophilizing agents examples include anionic surfactants such as fatty acid sulfonates and higher alcohol sulfates, cationic surfactants such as quaternary ammonium salts, polyethylene glycol fatty acid esters, polyglycerol fatty acid esters, and sorbitan fatty acids.
  • anionic surfactants such as esters, silicone surfactants such as polyoxyalkylene-modified silicones, and stain release agents made of polyester, polyamide, acrylic or urethane resins are used.
  • the liquid-permeable sheet 30 is moderately bulky and has a basis weight from the viewpoint of being able to impart good liquid permeability, flexibility, strength and cushioning properties to the absorbent article, and from the viewpoint of increasing the liquid permeation speed of the absorbent article. It may be a large non-woven fabric.
  • the nonwoven fabric used for the liquid-permeable sheet 30 may have a basis weight of 5 to 200 g/m 2 , 8 to 150 g/m 2 , or 10 to 100 g/m 2 .
  • the thickness of the nonwoven fabric used for the liquid-permeable sheet 30 may be 20-1400 ⁇ m, 50-1200 ⁇ m, or 80-1000 ⁇ m.
  • the liquid-permeable sheet 30 may be composed of two or more sheets, and the surface thereof may be embossed or perforated in order to improve the diffusibility of the liquid.
  • the embossing and perforation can be carried out by known methods.
  • the liquid-permeable sheet 30 may contain a skin lotion, a moisturizing agent, an antioxidant, an anti-inflammatory agent, a pH adjuster, and the like in order to reduce irritation to the skin.
  • the shape of the liquid-permeable sheet 30 depends on the shapes of the absorbent body and absorbent article, but may be a shape that covers the absorbent body 10 so as to prevent liquid leakage.
  • the core wrap 20 is arranged, for example, so as to cover the outer periphery of the absorbent body 10 .
  • the absorbent body 10 is arranged inside the core wrap 20 .
  • Examples of the core wrap 20 include tissue, nonwoven fabric, and the like.
  • the core wrap 20 has, for example, a main surface with a size equivalent to that of the absorbent body 10 .
  • the absorber 10 is shape-retained by enclosing it in the core wrap 20 .
  • the method of retaining the shape of the absorbent body with core wraps is not limited to this. good.
  • An adhesive binder may be blended in order to enhance the shape retention of the absorbent before and during use.
  • adhesive binders include heat-fusible synthetic fibers, hot-melt adhesives, adhesive emulsions, and the like.
  • Heat-fusible synthetic fibers include, for example, all-melting binders such as polyethylene, polypropylene, and ethylene-propylene copolymers, and non-total-melting binders having side-by-side or core-sheath structures of polypropylene and polyethylene. In the non-total melting binder described above, only the polyethylene portion is heat-sealed.
  • Hot melt adhesives include, for example, ethylene-vinyl acetate copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer. , amorphous polypropylene, and other base polymers with tackifiers, plasticizers, antioxidants, and the like.
  • adhesive emulsions include polymers of at least one or more monomers selected from the group consisting of methyl methacrylate, styrene, acrylonitrile, 2-ethylhexyl acrylate, butyl acrylate, butadiene, ethylene, and vinyl acetate. be done. These adhesive binders may be used alone or in combination of two or more.
  • the liquid-impermeable sheet 40 is arranged on the outermost side of the absorbent article 100 opposite to the liquid-permeable sheet 30 .
  • the liquid impermeable sheet 40 is arranged below the core wrap 20 while being in contact with the core wrap 20 .
  • the liquid-impermeable sheet 40 has, for example, a main surface wider than the main surface of the absorbent body 10, and the outer edge of the liquid-impermeable sheet 40 extends around the absorbent body 10 and the core wrap 20. ing.
  • the liquid-impermeable sheet 40 prevents the liquid absorbed by the absorbent body 10 from leaking out from the liquid-impermeable sheet 40 side.
  • liquid-impermeable sheet 40 a sheet made of a synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride, or a spunbond/meltblown/spunbond (SMS) nonwoven fabric in which a water-resistant meltblown nonwoven fabric is sandwiched between high-strength spunbond nonwoven fabrics. and sheets made of nonwoven fabrics such as nonwoven fabrics, and sheets made of composite materials of these synthetic resins and nonwoven fabrics (for example, spunbond nonwoven fabrics and spunlaced nonwoven fabrics).
  • the liquid-impermeable sheet 40 may have air permeability from the viewpoint of reducing stuffiness when worn and reducing discomfort given to the wearer.
  • the liquid-impermeable sheet 40 a sheet made of synthetic resin mainly composed of low-density polyethylene (LDPE) resin can be used.
  • the liquid-impermeable sheet 40 may be, for example, a synthetic resin sheet having a weight per unit area of 10 to 50 g/m 2 from the viewpoint of ensuring flexibility so as not to impair the wearing comfort of the absorbent article.
  • a filler may be added to the resin sheet, or the liquid-impermeable sheet 40 may be embossed. Calcium carbonate or the like is used as the filler.
  • absorbent article 100 in addition to the liquid-permeable sheet, absorber, liquid-impermeable sheet, and core wrap described above, members may be present as appropriate according to the application and function. Examples thereof include outer cover nonwoven fabrics and leg gathers.
  • the outer cover nonwoven fabric may be arranged on the side of the liquid impermeable sheet 40 facing the absorbent body.
  • the outer cover nonwoven fabric can be adhered to the liquid impermeable sheet 40 using an adhesive, for example.
  • the outer cover nonwoven fabric may be formed of one or more layers and may be a soft material.
  • the outer cover nonwoven fabric may be imparted with a soft touch, may have a pattern printed on it, or may have a plurality of joints so as to appeal to consumers' willingness to purchase or for other reasons. , embossed, or formed into a three-dimensional form.
  • the absorbent article 100 of the present invention is a leg gather provided with stretchable elastic members arranged outside both widthwise end portions of the absorbent body 10 and substantially parallel to the longitudinal direction of the absorbent body 10. may have The length of the leg gathers is set to be around the wearer's leg or longer. The elongation rate of the leg gathers is appropriately set from the viewpoint of preventing the leakage of discharged liquid and reducing the feeling of oppression when worn for a long time.
  • the absorbent article 100 of the present invention may have front/back gathers provided near both ends in the longitudinal direction of the absorbent article and provided with elastic members that stretch in the width direction.
  • the absorbent article 100 has front/back gathers that can rise above the side edges in the width direction of the absorbent body 10 . That is, on both sides of the absorbent article in the longitudinal direction, a front/back gather sheet member having a gather elastic member is arranged to constitute a front/back gather.
  • the member for the front/back gathers is usually made of a liquid-impermeable or water-repellent material, preferably a moisture-permeable material.
  • a liquid-impermeable or water-repellent porous sheet preferably a liquid-impermeable or water-repellent nonwoven fabric, or a laminate of the porous sheet and the nonwoven fabric.
  • the nonwoven fabric include thermal bonded nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric, spunbond/meltblown/spunbond nonwoven fabric, and the like.
  • the basis weight of the member may be 5 to 100 g/m 2 , 8 to 70 g/m 2 , or 10 to 40 g/m 2 .
  • the absorbent article 100 can be manufactured, for example, by a method that includes placing the absorbent body 10 in the core wrap 20 and placing them between the liquid permeable sheet 30 and the liquid impermeable sheet 40. .
  • a laminate in which the liquid-impermeable sheet 40, the core wrap 20, the absorber 10, the core wrap 20, and the liquid-permeable sheet 30 are laminated in this order is pressurized as necessary.
  • the laminate may or may not contain the liquid-impermeable sheet 40 .
  • Each member constituting the absorbent article 100 may be adhered.
  • the absorbent body 10 and the liquid-permeable sheet 30 are adhered, and more preferably the core wrap 20 and the absorbent body 10 are adhered.
  • Adhesion methods include known methods such as adhesives, heat sealing, and ultrasonic sealing.
  • a hot-melt adhesive is applied to the liquid-permeable sheet 30 at predetermined intervals in the width direction in a shape such as vertical stripes or spirals, starch, carboxymethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone and other water and a method using a water-soluble adhesive selected from flexible polymers.
  • a method using heat-fusibility may be employed.
  • the shape of the absorbent article 100 is appropriately determined according to the application.
  • the absorbent article when it is a urine pad or sanitary napkin for light incontinence, it may be substantially rectangular, oval, hourglass, battledore, or the like. be done.
  • the absorbent article of the present invention it is preferable that at least one of the liquid-permeable sheet, the absorbent body, and the space between the liquid-permeable sheet and the absorbent body is provided with a means for improving liquid permeability.
  • the liquid permeability improving means means means for improving the liquid permeability between the liquid permeable sheet and the absorber by providing the means. and other means.
  • the liquid permeability enhancing means is preferably an embossed structure and/or an arrangement of a liquid acquisition diffusion sheet.
  • the embossed structure is, specifically, an uneven shape formed by embossing the surface of the liquid-permeable sheet or absorbent, and the formation of the uneven shape makes it easier for the liquid to permeate.
  • the pattern when the embossed structure is viewed in plan is not particularly limited, and can be, for example, a lattice pattern.
  • the slit structure is a structure in which a slit-shaped hole is provided in at least a part of the absorbent body, and the absorbent body is cut, compressed, or penetrated in the thickness direction to form a recess, groove, or slit. It can also be structured. By arranging the slits so as to form liquid flow paths, it is possible to promote liquid diffusion along the flow paths, thereby facilitating the permeation of the liquid.
  • the slit structure can be provided in the central part of the absorbent body in a straight line from the middle point in the longitudinal direction to both ends. Further, when the absorber is viewed from above, the ratio of the slit structure to the area (100%) of the absorber is preferably about 2 to 30%.
  • the liquid acquisition and diffusion sheet is arranged between the liquid permeable sheet and the absorber.
  • the liquid that has permeated the liquid permeable sheet 30 can be rapidly moved to the absorbent body 10 side.
  • a hot melt adhesive, heat embossing, or ultrasonic welding may be used for bonding between the liquid acquisition diffusion sheet and the liquid permeable sheet 30 .
  • the liquid acquisition/diffusion sheet a non-woven fabric or a resin film having a large number of through-holes can be used.
  • the nonwoven fabric materials similar to those described in the section of the liquid permeable sheet 30 can be used. It is preferable because it has excellent liquid transfer characteristics.
  • the liquid acquisition/diffusion sheet is usually arranged in the central portion with a shorter width than the absorbent body 10, but may be arranged over the entire width.
  • the length of the liquid acquisition/diffusion sheet in the front-rear direction may be substantially the same as the total length of the absorbent article, may be substantially the same as the total length of the absorbent body 10, or may be within a range of lengths assuming the portion into which the liquid is introduced.
  • the basis weight of the liquid acquisition diffusion sheet is preferably in the range of 15-75 g/m 2 .
  • the median particle size of the activated carbon is preferably 1 ⁇ m or more, more preferably 5 ⁇ m or more, still more preferably 10 ⁇ m or more, and preferably 100 ⁇ m or less, more preferably It is 70 ⁇ m or less, more preferably 50 ⁇ m or less, and preferable ranges include 1 to 100 ⁇ m and 5 to 70 ⁇ m.
  • the median particle size (D50 (median size), volume basis) of activated carbon can be measured using a laser diffraction particle size distribution analyzer, and specifically, it is a value measured by the method described in Examples. be.
  • the shape of the activated carbon is preferably crushed, cylindrical, or the like, and more preferably crushed.
  • the BET specific surface area of the activated carbon is preferably 100 m 2 /g or more, more preferably 1000 m 2 /g or more, and preferably 3000 m 2 /g or less. , more preferably 2000 m 2 /g or less, and preferred ranges include 100 to 3000 m 2 /g, 1000 to 2000 m 2 /g, and the like.
  • the BET specific surface area of activated carbon can be measured using a specific surface area measuring device, and specifically, it is a value measured by the method described in the Examples.
  • the activated carbon is preferably activated carbon having a polar functional group (hydrophilic functional group) on its surface (that is, hydrophilic activated carbon).
  • Polar functional groups include, for example, a hydroxy group, a carboxy group, a phenol group, and the like.
  • Activated carbon having a polar functional group on its surface is commercially available as, for example, activated carbon for liquid phase, activated carbon for water treatment, and the like.
  • sources of activated carbon include coconut shells, infusible or carbonized organic materials, and infusible resins such as phenolic resins.
  • organic materials include polyacrylonitrile, pitch, polyvinyl alcohol, and cellulose.
  • the source of activated carbon is preferably coconut shells and pitch (for example, coal pitch).
  • the basis weight of the activated carbon per unit area in that region is preferably 0.025 g/m 2 or more, more preferably 0.050 g. /m 2 or more, more preferably 0.100 g/m 2 or more, preferably 7.000 g/m 2 or less, more preferably 6.000 g/m 2 or less, still more preferably 5.000 g/m 2
  • the preferred range is 0.025 to 7.000 g/m 2 , more preferably 0.050 to 6.000 g/m 2 , still more preferably 0.100 to 5.000 g/m 2 .
  • Viewing the absorbent body from the top means looking down on the absorbent body, which has been placed on a horizontal board so that there is no slack or overlap, from above in the vertical direction with respect to the horizontal plane.
  • the area means an area surrounded by the outer edges of the members constituting the absorbent body.
  • the content of activated carbon contained in the absorbent article of the present invention is preferably 0.0005 parts by mass or more, more preferably 0.0010 parts by mass or more, more preferably 0.0100 parts by mass or more, preferably 1.0000 parts by mass or less, more preferably 0.8000 parts by mass or less, still more preferably 0.6000 parts by mass or less, It is 0.5000 parts by mass or less, and the preferred range is 0.0005 to 1.0000 parts by mass, 0.0010 to 0.8000 parts by mass, and the like.
  • the content of activated carbon contained in the absorbent article of the present invention is preferably 0.05 parts by mass or more, relative to 100 parts by mass of the water-absorbing resin particles. It is preferably 0.10 parts by mass or more, more preferably 0.20 parts by mass or more, and is preferably 7.00 parts by mass or less, more preferably 3.00 parts by mass or less, and still more preferably 1.00 parts by mass. Below, it is more preferably 0.50 parts by mass or less, and preferred ranges are 0.05 to 7.00 parts by mass, 0.10 to 6.00 parts by mass, and the like.
  • the content of activated carbon contained in the absorbent article of the present invention, when hydrophilic fibers are contained in the absorber is set to: Preferably 0.005 parts by mass or more, more preferably 0.050 parts by mass or more, still more preferably 0.100 parts by mass or more, and preferably 7.700 parts by mass or less, more preferably 4.000 parts by mass Below, it is more preferably 3.000 parts by mass or less, more preferably 2.500 parts by mass or less. be.
  • the iodine adsorption amount of the activated carbon is preferably 100 mg/g or more, more preferably 500 mg/g or more, and preferably 3000 mg/g or less, more preferably 2000 mg/g or less, and preferred ranges include 100 to 3000 mg/g and 500 to 2000 mg/g.
  • the iodine adsorption amount of activated carbon is a value measured in accordance with JIS K1474:2014.
  • the weight loss on drying of activated carbon is preferably 0.1% or more, more preferably 0.5% or more, and preferably 8% or less, more preferably It is 5% or less, and preferred ranges include 0.1 to 8% and 0.5 to 5%.
  • the loss on drying of activated carbon is a value measured in accordance with JIS K1474:2014.
  • the pH of the activated carbon is preferably 3 or more, more preferably 5 or more, and is preferably 12 or less, more preferably 11 or less. includes 3 to 12, 5 to 11, and the like.
  • the pH of activated carbon is a value measured according to JIS K1474:2014.
  • the activated carbon is contained in the absorber, it is preferable that the activated carbon is arranged on the surface of the water absorbent resin particles (that is, the activated carbon is present on the surface of the water absorbent resin particles).
  • the water-absorbent resin particles contained in the absorbent body have a heat release rate of 0.10° C./second or more and 1.00° C./second or less as measured by the heat release rate measurement method. is.
  • the heat generation rate of the water-absorbing resin particles is preferably 0.10° C./second or more, more preferably 0.15° C./second or more, and is preferably 1.00° C./second or less, more preferably 0.15° C./second or more. It is 60° C./second or less, and preferable ranges include 0.10 to 1.00° C./second and 0.15 to 0.60° C./second.
  • the water-absorbent resin particles are formed by cross-linking polymers of water-soluble ethylenically unsaturated monomers, that is, by cross-linked polymers having structural units derived from water-soluble ethylenically unsaturated monomers.
  • the water absorption rate of the water-absorbing resin particles by the Vortex method is preferably 60 seconds or less, more preferably 50 seconds or less, and still more preferably 40 seconds or less. is 1 second or more, more preferably 3 seconds or more, still more preferably 10 seconds or more, and the preferred range is 1 to 60 seconds, 3 to 40 seconds, and the like.
  • the water absorption rate of the water-absorbing resin particles by the Vortex method is a value measured by the method described in Examples.
  • the water-absorbent resin particles preferably have a physiological saline water retention capacity of 20 g/g or more, more preferably 25 g/g or more, and still more preferably 30 g/g or more, Also, it is preferably 60 g/g or less, more preferably 55 g/g or less, still more preferably 50 g/g or less.
  • the physiological saline water absorption amount of the water-absorbing resin particles under a load of 4.14 kPa is preferably 5 mL/g or more, more preferably 10 mL/g or more, and further It is preferably 15 mL/g or more, more preferably 40 mL/g or less, more preferably 35 mL/g or less, still more preferably 30 mL/g or less, and the preferred range is 5 to 40 mL/g.
  • the physiological saline water retention capacity of the water-absorbing resin particles and the physiological saline water absorption capacity under a load of 4.14 kPa are values measured by the method described in Examples.
  • the BET specific surface area of the water-absorbing resin particles is preferably 0.01 m 2 /g or more, more preferably 0.02 m 2 /g or more, and even more preferably. is 0.04 m 2 /g or more, preferably 0.20 m 2 /g or less, more preferably 0.17 m 2 /g or less, still more preferably 0.15 m 2 /g or less, and is preferred Ranges include 0.01-0.20 m 2 /g, 0.02-0.17 m 2 /g, 0.04-0.15 m 2 /g, and the like.
  • the BET specific surface area of the water-absorbing resin particles can be measured using a specific surface area measuring device, and specifically, it is a value measured by the method described in Examples.
  • the water absorbent resin is usually particulate.
  • the median particle diameter of the water-absorbing resin particles is 150 ⁇ m or more, 200 ⁇ m or more, 240 ⁇ m or more, 260 ⁇ m or more, or 280 ⁇ m or more from the viewpoint of suitably exhibiting the effects of the present invention while avoiding local absorption in the absorbent article. , or preferably 300 ⁇ m or more.
  • the median particle diameter is preferably 850 ⁇ m or less, 600 ⁇ m or less, 550 ⁇ m or less, 500 ⁇ m or less, 450 ⁇ m or less, or 400 ⁇ m or less from the viewpoint of suitably exhibiting the effects of the present invention while making the feel of the absorbent article comfortable. .
  • the median particle size is preferably 150 to 850 ⁇ m, more preferably 200 to 600 ⁇ m, even more preferably 240 to 500 ⁇ m, even more preferably 280 to 450 ⁇ m, further preferably 300 to 400 ⁇ m. It is even more preferable to have
  • the water-absorbent resin particles may be in the form (secondary particles) in which fine particles (primary particles) are aggregated, in addition to the form in which each is composed of a single particle.
  • secondary particles fine particles
  • the shape of the primary particles include a substantially spherical shape, an irregular crushed shape, and a plate shape.
  • a substantially spherical single particle having a smooth surface shape such as a perfect sphere, an ellipsoid, or the like may be used.
  • the median particle size of the water-absorbing resin particles can be measured using a JIS standard sieve, and specifically, it is a value measured by the method described in Examples.
  • polymerization method of the water-soluble ethylenically unsaturated monomer typical polymerization methods such as aqueous solution polymerization method, emulsion polymerization method and reverse phase suspension polymerization method are used.
  • aqueous solution polymerization method polymerization is carried out by heating an aqueous solution of a water-soluble ethylenically unsaturated monomer while stirring it if necessary.
  • reversed-phase suspension polymerization method polymerization is carried out by heating a water-soluble ethylenically unsaturated monomer in a hydrocarbon dispersion medium with stirring.
  • the method for producing water-absorbent resin particles in the method for producing water-absorbent resin particles by reverse-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon dispersion medium, a radical polymerization initiator and a step of surface-crosslinking the water-containing gel obtained by the polymerization in the presence of a surface-crosslinking agent.
  • an internal cross-linking agent may be added to the water-soluble ethylenically unsaturated monomer to form a hydrogel having an internal cross-linked structure.
  • water-soluble ethylenically unsaturated monomers include (meth)acrylic acid (in the present specification, "acryl” and “methacryl” are collectively referred to as “(meth)acrylic”; the same shall apply hereinafter) and Salts thereof; 2-(meth)acrylamido-2-methylpropanesulfonic acid and salts thereof; (meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-hydroxyethyl (meth)acrylate, N-methylol (meth) Nonionic monomers such as acrylamide and polyethylene glycol mono(meth)acrylate; amino groups such as N,N-diethylaminoethyl (meth)acrylate, N,N-diethylaminopropyl (meth)acrylate and diethylaminopropyl (meth)acrylamide Containing unsaturated monomers and
  • water-soluble ethylenically unsaturated monomers (meth)acrylic acid or a salt thereof, (meth)acrylamide, and N,N-dimethylacrylamide are preferable from the viewpoint of industrial availability. , (meth)acrylic acid and salts thereof are more preferred.
  • These water-soluble ethylenically unsaturated monomers may be used alone or in combination of two or more.
  • acrylic acid and its salts are widely used as raw materials for water absorbent resin particles. It may also be used for In this case, acrylic acid and/or its salt is preferably used as a main water-soluble ethylenically unsaturated monomer in an amount of 70 to 100 mol % based on the total water-soluble ethylenically unsaturated monomers.
  • 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.
  • the water-soluble ethylenically unsaturated monomer can increase the dispersion efficiency in the hydrocarbon dispersion medium by forming an aqueous solution.
  • the concentration of the water-soluble ethylenically unsaturated monomer in this aqueous solution is preferably in the range of 20 mass % to the saturated concentration.
  • 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.
  • the concentration of the water-soluble ethylenically unsaturated monomer is more preferably 25% by mass or more, still more preferably 28% by mass or more, and even more preferably 30% by mass or more.
  • the acid group is optionally alkalinized in advance.
  • Those neutralized with a neutralizing agent may also be used.
  • alkaline neutralizers include alkali metal salts such as sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, potassium hydroxide and potassium carbonate; ammonia and the like.
  • these alkaline neutralizers may be used in the form of an aqueous solution in order to facilitate the neutralization operation.
  • the alkaline neutralizing agent mentioned above may be used independently and may be used in combination of 2 or more types.
  • the degree of neutralization of the water-soluble ethylenically unsaturated monomer with the alkaline neutralizing agent is 10 to 100 mol% as the degree of neutralization of all acid groups possessed by the water-soluble ethylenically unsaturated monomer. is preferred, 30 to 90 mol % is more preferred, 40 to 85 mol % is even more preferred, and 50 to 80 mol % is even more preferred.
  • radical polymerization initiators added to the polymerization step include persulfates such as potassium persulfate, ammonium persulfate and sodium persulfate, methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, di-t-butyl peroxide, Peroxides such as t-butyl cumyl peroxide, t-butyl peroxyacetate, t-butyl peroxy isobutyrate, t-butyl peroxy pivalate, hydrogen peroxide, and 2,2'-azobis ( 2-amidinopropane) dihydrochloride, 2,2′-azobis[2-(N-phenylamidino)propane]dihydrochloride, 2,2′-azobis[2-(N-allylamidino)propane]dihydrochloride , 2,2′-azobis ⁇ 2-[1-(2-hydroxyethyl
  • radical polymerization initiators potassium persulfate, ammonium persulfate, sodium persulfate and 2,2′-azobis(2-amidinopropane) dihydrochloride are preferred from the viewpoint of easy availability and handling. be done.
  • 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, and L-ascorbic acid.
  • the amount of the radical polymerization initiator used is, for example, 0.00005 to 0.01 mol per 1 mol of the water-soluble ethylenically unsaturated monomer. By satisfying such a usage amount, rapid polymerization reaction can be avoided and the polymerization reaction can be completed in an appropriate time.
  • Examples of the internal cross-linking agent include those capable of cross-linking the polymer of water-soluble ethylenically unsaturated monomers used. Means with and without. Same below], (poly)propylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, diols such as (poly)glycerin, polyols such as triols, (meth)acrylic acid, and maleic acid , unsaturated polyesters obtained by reacting with unsaturated acids such as fumaric acid; bisacrylamides such as N,N-methylenebisacrylamide; di(meth)obtained by reacting polyepoxide with (meth)acrylic acid ) Acrylic acid esters or tri(meth)acrylic acid esters; di(meth)acrylic acid carbamyl esters obtained by reacting polyisocyanates such as tolylene diisocyanate and hexamethylene
  • a polyglycidyl compound more preferably a diglycidyl ether compound, such as (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, (poly)glycerin. Preference is given to using diglycidyl ethers.
  • diglycidyl ethers Preference is given to using diglycidyl ethers.
  • the amount of the internal cross-linking agent used is preferably 0.000001 to 0.02 mol, more preferably 0.00001 to 0.01 mol, per 1 mol of the water-soluble ethylenically unsaturated monomer. It is more preferably 0.00001 to 0.005 mol, even more preferably 0.00005 to 0.002 mol.
  • hydrocarbon dispersion media examples include those having 6 to 8 carbon atoms such as n-hexane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 3-ethylpentane and n-octane.
  • Aliphatic 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 and xylene;
  • hydrocarbon dispersion media n-hexane, n-heptane, and cyclohexane are preferably used because they are industrially readily available, stable in quality, and inexpensive.
  • These hydrocarbon dispersion media may be used alone or in combination of two or more.
  • a commercially available product such as Exsolheptane (manufactured by Exxon Mobil Co., containing 75 to 85% by mass of heptane and its isomer hydrocarbons) can also be used to obtain suitable results. be able to.
  • the amount of the hydrocarbon dispersion medium used is the water-soluble ethylenically unsaturated monomer in the first stage. It is preferably 100 to 1,500 parts by mass, more preferably 200 to 1,400 parts by mass, based on 100 parts by mass.
  • 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-described first stage polymerization is the first stage in single stage polymerization or multistage polymerization. means the polymerization reaction of (the same applies below).
  • a dispersion stabilizer 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.
  • surfactants 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, and polyoxyethylene.
  • Alkyl ethers polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkyl allyl formaldehyde condensed polyoxyethylene ethers, polyoxyethylene polyoxypropylene block copolymers, polyoxyethylene polyoxypropyl alkyl ethers, Using polyethylene glycol fatty acid esters, alkyl glucosides, N-alkyl gluconamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl allyl ether phosphates, etc. can be done.
  • sorbitan fatty acid esters 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.
  • the amount of the surfactant used is preferably 0.1 to 30 parts by mass, preferably 0.3 to 20 parts by mass, per 100 parts by mass of the water-soluble ethylenically unsaturated monomer in the first stage. Parts by mass are more preferable.
  • a polymeric dispersant may be used together with the surfactant described above.
  • 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), anhydrous Maleic acid-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, ethylhydroxyethyl cellulose and the like.
  • 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, oxidized ethylene/propylene copolymer It is preferred to use polymers. These polymeric dispersants may be used alone or in combination of two or more.
  • the amount of the polymeric dispersant used is preferably 0.1 to 30 parts by mass, preferably 0.3 to 20 parts by mass, relative to 100 parts by mass of the water-soluble ethylenically unsaturated monomer in the first stage. Parts by mass are more preferred.
  • reverse phase suspension polymerization can be performed by adding a thickener to an aqueous solution containing a water-soluble ethylenically unsaturated monomer.
  • a thickener 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.
  • thickeners examples include hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyacrylic acid, (partially) neutralized polyacrylic acid, polyethylene glycol, polyacrylamide, polyethyleneimine, dextrin, sodium alginate, and polyvinyl alcohol. , polyvinylpyrrolidone, polyethylene oxide and the like can be used. If the stirring speed during polymerization is the same, 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 tend to be.
  • reverse phase suspension polymerization for 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.
  • the dispersion stabilizer surfactant or polymeric dispersant
  • the dispersion stabilizer may be added before or after the addition of the aqueous monomer solution as long as it is before the polymerization reaction is initiated.
  • Such reversed-phase suspension polymerization can be carried out in one stage or in multiple stages of two or more stages. In addition, from the viewpoint of increasing productivity, it is preferable to carry out in 2 to 3 steps.
  • water-soluble ethylenically unsaturated monomers are added to the reaction mixture obtained in the first-stage polymerization reaction.
  • the monomers are added and mixed, and reversed-phase suspension polymerization in the second and subsequent stages may be carried out in the same manner as in the first stage.
  • a radical polymerization initiator is added during the reversed phase suspension polymerization in each stage after the second stage.
  • the reverse phase suspension polymerization can be performed by adding each component within the range of the molar ratio to the water-soluble ethylenically unsaturated monomer described above. preferable. Also in the second and subsequent stages of polymerization, if necessary, an internal cross-linking agent may be added to the water-soluble ethylenically unsaturated monomer.
  • the reaction temperature for the polymerization reaction is 20 to 110° C. from the viewpoints of speeding up the polymerization, shortening the polymerization time, thereby improving economic efficiency, and facilitating the removal of the heat of polymerization to allow the reaction to proceed smoothly. and more preferably 40 to 90°C.
  • the water-absorbing resin particles of the present invention are crosslinked by adding a surface cross-linking agent to a hydrous gel-like substance having an internal cross-linked structure obtained by polymerizing a water-soluble ethylenically unsaturated monomer. It is obtained by (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.
  • Examples of surface cross-linking agents include compounds having two or more reactive functional groups.
  • polyols such as ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, triethylene glycol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol, polyglycerin;
  • Polyglycidyl compounds such as glycidyl ether, (poly)glycerol diglycidyl ether, (poly)glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, (poly)glycerol polyglycidyl ether; epichlorohydrin, Haloepoxy compounds such as epibromhydrin and ⁇ -methylepichlorohydrin; isocyanate compounds such as 2,4-tolylene diisocyanate and hexam
  • surface cross-linking agents (poly)ethylene glycol diglycidyl ether, (poly)glycerin diglycidyl ether, (poly)glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, (poly)propylene glycol polyglycidyl ether, ( Polyglycidyl compounds such as poly)glycerol polyglycidyl ether are preferred.
  • These surface cross-linking agents may be used alone or in combination of two or more.
  • the amount of the surface cross-linking agent used is preferably 0.00001 to 0.01 mol, preferably 0.00005 to 0.01 mol, per 1 mol of the total amount of water-soluble ethylenically unsaturated monomers used in the polymerization. 005 mol, more preferably 0.0001 to 0.002 mol.
  • the surface cross-linking agent may be added as it is or as an aqueous solution, but if necessary, it may be added as a solution using a hydrophilic organic solvent as a solvent.
  • Hydrophilic organic solvents include, for example, lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol and isopropyl alcohol; ketones such as acetone and methyl ethyl ketone; ethers such as diethyl ether, dioxane and tetrahydrofuran; - amides such as dimethylformamide; sulfoxides such as dimethylsulfoxide; These hydrophilic organic solvents may be used alone, in combination of two or more, or as a mixed solvent with water.
  • the timing of addition of the surface cross-linking agent may be after almost all the polymerization reaction of the water-soluble ethylenically unsaturated monomer is completed. It is preferably added in the presence of water in the range of 400 parts by mass, more preferably in the presence of water in the range of 5 to 200 parts by mass, and added in the presence of water in the range of 10 to 100 parts by mass. is more preferable, and adding in the presence of water in the range of 20 to 60 parts by mass is even more preferable.
  • the amount of water means the total amount of water contained in the reaction system and water used as necessary when adding the surface cross-linking agent.
  • the reaction temperature in the surface cross-linking reaction is preferably 50 to 250°C, more preferably 60 to 180°C, even more preferably 60 to 140°C, and more preferably 70 to 120°C. More preferred.
  • the reaction time of the surface cross-linking reaction is preferably 1 to 300 minutes, more preferably 5 to 200 minutes.
  • a drying step may be included in which water, a hydrocarbon dispersion medium, and the like are removed by distillation by applying energy such as heat from the outside.
  • dehydrating the water-containing gel after reverse-phase suspension polymerization by heating the system in which the water-containing gel is dispersed in the hydrocarbon dispersion medium, the water and the hydrocarbon dispersion medium are temporarily removed from the system by azeotropic distillation. Distill off. At this time, if only the hydrocarbon dispersion medium that has been distilled off is returned into the system, continuous azeotropic distillation becomes possible.
  • the temperature in the system during drying is maintained at or below the azeotropic temperature with the hydrocarbon dispersion medium, which is preferable from the viewpoint of the resin being less likely to deteriorate.
  • Water and the hydrocarbon dispersion medium are subsequently distilled off to obtain water absorbent resin particles.
  • the drying treatment by distillation may be performed under normal pressure or under reduced pressure. Moreover, from the viewpoint of increasing the drying efficiency, the drying may be performed under an air current such as nitrogen.
  • the drying temperature is preferably 70 to 250° C., more preferably 80 to 180° C., further preferably 80 to 140° C., further preferably 90 to 130° C. is even more preferred.
  • the drying temperature is preferably 40 to 160°C, more preferably 50 to 110°C.
  • the above-described drying step by distillation is performed after the completion of the surface cross-linking step.
  • the surface cross-linking step and the drying step may be performed simultaneously.
  • the water absorbent resin particles may contain additives according to the purpose.
  • additives include inorganic powders, surfactants, oxidizing agents, reducing agents, metal chelating agents, radical chain inhibitors, antioxidants, antibacterial agents, and the like.
  • amorphous silica as an inorganic powder to 100 parts by mass of the water absorbent resin particles, the fluidity of the water absorbent resin particles in the absorbent body can be further improved.
  • the additive is preferably hydrophilic or water-soluble.
  • the water-absorbent resin particles, activated carbon, and absorbent articles obtained in Examples and Comparative Examples were evaluated in the following tests. Unless otherwise specified, the measurements were carried out in an environment of temperature 25 ⁇ 2° C. and humidity 50 ⁇ 10%.
  • 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. While stirring the mixture in the separable flask with a stirrer, the temperature was raised to 50° C. to dissolve sorbitan monolaurate in n-heptane. The solution formed was cooled to 40°C.
  • the resulting aqueous monomer solution was added to the separable flask containing the solution containing sorbitan monolaurate, and the system was sufficiently purged with nitrogen.
  • the polymerization reaction was allowed to proceed by holding the reaction solution in the separable flask in a hot water bath at 70° C. for 60 minutes while stirring with the stirrer rotating at 700 rpm.
  • a dispersion of 0.092 g of amorphous silica (Oriental Silicas Corporation, Toxyl NP-S) dispersed in 100 g of n-heptane was added to the reaction solution containing the hydrogel polymer produced by the polymerization reaction. The reaction was stirred for 1 minute. The separable flask was immersed in an oil bath at 125° C., and 98.5 g of water was extracted out of the system by azeotropic distillation.
  • Water and n-heptane were evaporated by heating the reaction mixture to 125° C. to obtain dried polymer particles.
  • This dried product was passed through a sieve with an opening of 850 ⁇ m to obtain 86.3 g of water absorbent resin particles of Production Example 1.
  • the water-absorbent resin particles have a physiological saline water retention capacity of 35 g/g, a water absorption rate of 4 seconds, a median particle diameter of 360 ⁇ m, a heat generation rate of 0.33° C./second, and a physiological saline water absorption capacity under a load of 4.14 kPa. was 11 ml/g, and the BET specific surface area was 0.150 m 2 /g.
  • % sodium hydroxide aqueous solution 147.7 g was added dropwise to neutralize 75 mol %, then 0.092 g of hydroxyl ethyl cellulose (Sumitomo Seika Co., Ltd., HEC AW-15F) as a thickener, water-soluble radical polymerization 0.0736 g (0.272 mmol) of potassium persulfate as an agent and 0.010 g (0.057 mmol) of ethylene glycol diglycidyl ether as an internal cross-linking agent were added and dissolved to prepare a first aqueous solution.
  • hydroxyl ethyl cellulose Suditomo Seika Co., Ltd., HEC AW-15F
  • aqueous liquid prepared above was added to the separable flask and stirred for 10 minutes, and then in a 20 mL-vial bottle, 6.62 g of n-heptane was added to sucrose stearate of HLB3 as a surfactant ( Mitsubishi Kagaku Foods Co., Ltd., Ryoto Sugar Ester S-370) 0.736 g of a surfactant solution is further added and stirred at 550 rpm while the system is sufficiently filled with nitrogen. After the replacement, the flask was immersed in a water bath of 70° C. to raise the temperature, and polymerization was carried out for 60 minutes to obtain a first-stage polymerization slurry.
  • a surfactant solution Mitsubishi Kagaku Foods Co., Ltd., Ryoto Sugar Ester S-370
  • the entire amount of the second-stage aqueous liquid was added to the first-stage polymerization slurry liquid.
  • the flask was again immersed in a water bath at 70° C. to raise the temperature, and the polymerization reaction was carried out for 60 minutes to obtain a hydrous gel polymer.
  • the flask was immersed in an oil bath set at 125°C, and 256.1 g of water was extracted from the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. After that, 4.42 g (0.507 mmol) of 2% by mass ethylene glycol diglycidyl ether aqueous solution was added as a surface cross-linking agent to the flask, and the mixture was kept at 83° C. for 2 hours.
  • n-heptane was evaporated at 125° C. to dry, and passed through a sieve with an opening of 850 ⁇ m to obtain 230.0 g of water absorbent resin particles of Production Example 2.
  • the water-absorbent resin particles have a physiological saline water retention capacity of 41 g/g, a water absorption rate of 29 seconds, a median particle size of 312 ⁇ m, a heat generation rate of 0.14° C./second, and physiological saline water absorption under a 4.14 kPa load.
  • the amount was 19 mL/g and the BET specific surface area was 0.037 m 2 /g.
  • the water-absorbent resin particles have a physiological saline water retention capacity of 52 g/g, a water absorption rate of 48 seconds, a median particle diameter of 380 ⁇ m, a heat generation rate of 0.09° C./second, and physiological saline water absorption under a 4.14 kPa load.
  • the amount was 10 ml/g and the BET specific surface area was 0.031 m 2 /g.
  • the cotton bag is dehydrated for 1 minute using a dehydrator (manufactured by Kokusan Co., Ltd., product number: H-122) set to a centrifugal force of 167 G, and the cotton bag containing the swollen gel after dehydration.
  • the mass Wd (g) of was measured.
  • the same operation was performed without adding the water-absorbing resin particles, and the empty weight We (g) of the wet cotton bag was measured, and the physiological saline water retention capacity was calculated from the following formula.
  • Physiological saline water retention amount (g / g) [Wd - We] / 2.0
  • Physiological saline water absorption under 4.14 kPa load was measured using a measuring apparatus schematically shown in FIG. The measurement was performed twice for one type of water-absorbing resin particles, and the average value was obtained.
  • the measuring device comprises a burette part 1 , a clamp 3 , a conduit 5 , a pedestal 11 , a measuring table 13 and a measuring part 4 placed on the measuring table 13 .
  • the burette part 1 includes a burette tube 21 with a scale, a rubber stopper 23 sealing an upper opening of the burette tube 21, a cock 22 connected to the tip of the lower part of the burette tube 21, and a lower part of the burette tube 21. It has an air introduction pipe 25 and a cock 24 connected to.
  • the burette part 1 is fixed with a clamp 3 .
  • a flat plate-shaped measuring stand 13 has a through hole 13a with a diameter of 2 mm formed in its central portion, and is supported by a pedestal 11 whose height is variable. Through hole 13 a of measuring table 13 and cock 22 of burette portion 1 are connected by conduit 5 .
  • the inner diameter of conduit 5 is 6 mm.
  • 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 vertically movable within the cylinder 31 .
  • Cylinder 31 is placed on measuring table 13 via polyamide mesh 32 .
  • the inner diameter of the cylinder 31 is 20 mm.
  • the opening of the polyamide mesh 32 is 75 ⁇ m (200 meshes).
  • 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 described later. can.
  • the cocks 22 and 24 of the burette part 1 were closed, and 0.9% by mass physiological saline adjusted to 25° C. was introduced into the burette tube 21 through the opening at the top of the burette tube 21 .
  • the cocks 22 and 24 were opened.
  • the interior of the conduit 5 was filled with a 0.9 mass % saline solution 50 so as not to introduce air bubbles.
  • the height of the measuring table 13 was adjusted so that the height of the water surface of the 0.9% by mass saline solution reaching the inside of the through hole 13 a was the same as the height of the upper surface of the measuring table 13 .
  • the height of the water surface of the 0.9 mass % saline solution 50 in the burette tube 21 was read from the scale of the burette tube 21, and the position was taken as the zero point (read value at 0 seconds).
  • 0.10 g of water-absorbing resin particles 10a are uniformly arranged on a polyamide mesh 32 in a cylinder 31, a weight 33 is arranged on the water-absorbing resin particles 10a, and the cylinder 31 is set so that its center is It was installed so as to match the conduit port in the center of the measuring table 13 .
  • Decreased amount of physiological saline in burette tube 21 60 minutes after water-absorbing resin particles 10a began to absorb physiological saline from conduit 5 that is, amount of physiological saline absorbed by water-absorbing resin particles 10a
  • Wc (mL) was read, and the physiological saline water absorption capacity of the water absorbent resin particles 10a under a load of 4.14 kPa was calculated according to the following formula.
  • Physiological saline water absorption capacity under 4.14 kPa load (mL/g) Wc (mL)/mass of water absorbent resin particles (g)
  • ⁇ BET specific surface area of water absorbent resin particles The water-absorbing resin particles to be measured were passed through a sieve with an opening of 400 ⁇ m and adjusted to a particle size that can be retained on a sieve with an opening of 300 ⁇ m, and used for the measurement of the specific surface area.
  • 10 g of this classified sample was dispersed in 100 g of ethanol, washed with an ultrasonic cleaner (US-103, manufactured by SND Co., Ltd.) for 5 minutes, and then filtered through a 300 ⁇ m sieve. bottom. The same washing operation was performed two more times to obtain a sample for measurement that had been washed three times in total. This sample was dried at 100° C. for 16 hours under the degassing conditions of heat evacuation.
  • the adsorption isotherm was measured at a temperature of 77 K by a method using krypton gas as the adsorption gas with a specific surface area measuring device (AUTOSORB-1, manufactured by Quantachrome), the specific surface area was obtained from the multipoint BET plot, and the water absorption It was taken as the BET specific surface area of the resin particles.
  • activated carbon A It has a BET specific surface area of 1619 m 2 /g, a median particle size of 38 ⁇ m, an ignition residue of 0.1%, a drying loss of 0.8%, an iodine adsorption amount of 1560 mg/g, a pH of 7.1, and a crushed shape.
  • Activated carbon (Osaka Gas Chemicals Co., Ltd., product name: FP-3) was prepared. This was designated as activated carbon A.
  • Example 1 A sheet of molded pulp of the same size (12 cm ⁇ 11 cm, 189 g/m 2 ) was placed on a tissue (12 cm ⁇ 11 cm, 22 g/m 2 ), and the water absorbent resin particles 3 prepared in Production Example 1 were placed thereon. 0.0113 g (0.86 g/m 2 ) of activated carbon A was evenly applied . Further, the sheet-shaped molded pulp, the tissue, and a liquid-permeable sheet of the same size (50% polyethylene; 50% polypropylene, 12 cm x 11 cm, 21 g/m 2 ) were placed in this order on top of it.
  • a load of 284 kPa was applied for 30 seconds and pressed to obtain a laminate containing the absorber.
  • a liquid-impermeable sheet of the same size made of polyethylene, 12 cm ⁇ 11 cm, 39 g/m 2 ) was superimposed to prepare an absorbent article of Example 1.
  • Example 2 Except that instead of 3.75 g (284 g/m 2 ) of the water absorbent resin particles produced in Production Example 1, 3.75 g (284 g/m 2 ) of the water absorbent resin particles produced in Production Example 2 were uniformly dispersed. , in the same manner as in Example 1 to prepare an absorbent article of Example 2.
  • Example 3 A sheet of molded pulp of the same size (12 cm ⁇ 11 cm, 189 g/m 2 ) was placed on a tissue (12 cm ⁇ 11 cm, 22 g/m 2 ), and the water absorbent resin particles 3 prepared in Production Example 2 were placed thereon. 0.75 g (284 g/m 2 ) was evenly dispersed, and the sheet-form molded pulp and tissue were placed thereon in this order. Subsequently, 0.0113 g (0.86 g/m 2 ) of activated carbon A was evenly spread thereon.
  • the gas phase inside the sampling bag was removed, and instead, 5 L of dry air purified by passing through the activated carbon layer was injected.
  • the sampling bag was placed in a constant temperature and humidity machine (LHU-113 manufactured by Espec Co., Ltd.) set at a temperature of 36 ⁇ 1° C. and a humidity of 60 ⁇ 5%, and stored. After 1 hour, the sampling bag was removed from the thermo-hygrostat, and 1000 mL of the gas phase was collected in a pre-deaerated 1 L sampling bag (PAAAK1, manufactured by GL Sciences Co., Ltd.).

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JP2003102784A (ja) * 2001-09-28 2003-04-08 Toyobo Co Ltd 吸湿／吸水発熱性おむつ
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WO2011086843A1 (ja) 2010-01-13 2011-07-21 住友精化株式会社 吸水シート構成体
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JP2015070995A (ja) * 2013-10-04 2015-04-16 株式会社リブドゥコーポレーション 吸収性物品
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