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WO2025126867A1 - Particules de résine absorbant l'eau, corps absorbant l'eau, article absorbant l'eau et procédé de production de particules de résine absorbant l'eau - Google Patents

Particules de résine absorbant l'eau, corps absorbant l'eau, article absorbant l'eau et procédé de production de particules de résine absorbant l'eau Download PDF

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Publication number
WO2025126867A1
WO2025126867A1 PCT/JP2024/042328 JP2024042328W WO2025126867A1 WO 2025126867 A1 WO2025126867 A1 WO 2025126867A1 JP 2024042328 W JP2024042328 W JP 2024042328W WO 2025126867 A1 WO2025126867 A1 WO 2025126867A1
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Prior art keywords
water
mass
less
resin particles
absorbent resin
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PCT/JP2024/042328
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English (en)
Japanese (ja)
Inventor
真由 梶本
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Sumitomo Seika Chemicals Co Ltd
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Sumitomo Seika Chemicals Co Ltd
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Publication of WO2025126867A1 publication Critical patent/WO2025126867A1/fr
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/18—Suspension polymerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/04—Acids, Metal salts or ammonium salts thereof
    • C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/53—Phosphorus bound to oxygen bound to oxygen and to carbon only
    • C08K5/5317—Phosphonic compounds, e.g. R—P(:O)(OR')2
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof

Definitions

  • This disclosure relates to water-absorbent resin particles, absorbents, absorbent articles, and methods for producing water-absorbent resin particles.
  • metal chelating agents such as organophosphorus compounds and carboxylic acid compounds may be introduced to suppress coloration over time (for example, Patent Documents 1 to 5).
  • metal chelating agents can suppress the discoloration of water-absorbent resin particles, it is not expected that they will sufficiently improve the absorption properties of absorbent articles.
  • sheet-like absorbent articles used in nursing care products or pet sheets there is a tendency to emphasize the diffusion area when absorbing urine as an absorption property from the viewpoint of reducing the frequency of replacement, etc.
  • absorbent articles absorb urine that contains a lot of iron and vitamin C, the diffusion area tends to become large, and therefore improvements in this area are required.
  • the present disclosure relates to suppressing coloration of water-absorbent resin particles over time and reducing the area over which urine diffuses in absorbent articles.
  • the present disclosure includes the following.
  • An absorbent comprising the water-absorbent resin particles according to any one of [1] to [5].
  • An absorbent article comprising the absorbent body according to [6].
  • a reaction liquid containing a water-soluble ethylenically unsaturated monomer, water, a dispersion medium, and a surfactant having an HLB of 7 or more and 16 or less, and polymerizing the water-soluble ethylenically unsaturated monomer by reverse phase suspension polymerization in the reaction liquid to form a particulate hydrogel polymer containing a polymer containing the water-soluble ethylenically unsaturated monomer as a monomer unit and water in the reaction liquid; aggregating the hydrous gel polymer in the reaction liquid to form a plurality of aggregated particles containing the hydrous gel polymer; removing a portion of the water from the reaction solution containing the agglomerated particles and water to form a concentrate; forming a powder comprising polymer particles comprising the
  • the absorbent article of the present disclosure is useful, for example, as a nursing care product (waterproof sheet) or a pet sheet.
  • room temperature means 25 ⁇ 2°C.
  • Layer is used as a term that includes not only a structure with a shape that is continuously formed in the in-plane direction, but also a structure with a shape that is partially formed in the in-plane direction.
  • Saline means an aqueous sodium chloride solution with a concentration of 0.9% by mass, containing 9 g of sodium chloride per 1000 mL of water at room temperature.
  • (Meth)acrylic means both “acrylic” and "methacrylic”.
  • water-absorbent resin particles includes polymer particles containing a polymer and a phosphonic acid-based chelating agent.
  • the polymer contains a water-soluble ethylenically unsaturated monomer as a monomer unit.
  • the water-absorbent resin particles have a water-absorption speed for physiological saline of 30 seconds or less.
  • the proportion of particles having a particle diameter of 150 ⁇ m or less in the water-absorbent resin particles is 20 mass% or less relative to the total amount of the water-absorbent resin particles.
  • the polymer particles include a polymer formed by polymerization of a monomer including a water-soluble ethylenically unsaturated monomer.
  • the water-soluble ethylenically unsaturated monomer can be any monomer capable of forming a water-absorbent polymer particle.
  • the polymer constituting the polymer particles may include at least one water-soluble ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic acid and its alkali salts, 2-(meth)acrylamido-2-methylpropanesulfonic acid and its alkali salts, (meth)acrylamide, N,N-dimethyl(meth)acrylamide, 2-hydroxyethyl(meth)acrylate, N-methylol(meth)acrylamide, polyethylene glycol mono(meth)acrylate, N,N-diethylaminoethyl(meth)acrylate, N,N-diethylaminopropyl(meth)acrylate, and diethylaminopropyl(meth)acrylamide as a monomer unit.
  • water-soluble ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic acid and its alkali salts, 2-(meth)acrylamido-2-methylpropanes
  • the water-soluble ethylenically unsaturated monomer may include (meth)acrylic acid and its alkali metal salts, or may include acrylic acid and its alkali metal salts.
  • the alkali metal salt may be a sodium salt.
  • the proportion of monomer units derived from (meth)acrylic acid or an alkali metal salt thereof in the total amount of monomer units constituting the polymer may be 60 mol% or more, 70 mol% or more, 80 mol% or more, 90 mol% or more, or 95 mol% or more, or may be substantially 100 mol%.
  • the polymer constituting the polymer particle may be a crosslinked polymer having a crosslinked structure.
  • the crosslinked polymer may include a crosslinked structure due to self-crosslinking of the water-soluble ethylenically unsaturated monomer, a crosslinked structure formed by a reaction between a crosslinking agent and an ethylenically unsaturated monomer, or both of these.
  • the crosslinked polymer may include a crosslinked structure formed by an internal crosslinking agent that reacts with the water-soluble ethylenically unsaturated monomer during polymerization of the water-soluble ethylenically unsaturated monomer, a surface crosslinking agent that reacts with the polymer mainly in the surface layer portion of the polymer particle, or both of these.
  • a pseudo-crosslinked structure may be formed by the polymer chains constituting the crosslinked polymer becoming entangled with each other.
  • the phosphonic acid chelating agent is composed of one or more compounds having a phosphoryl group and capable of forming a chelate complex with a metal ion by a coordinate bond.
  • the phosphonic acid chelating agent may further include a compound having a coordinating group other than the phosphoryl group that can form a coordinate bond with a metal ion together with the phosphoryl group.
  • the phosphoryl group means a group represented by the following formula (1).
  • X1 and X2 each independently represent -OH (hydroxy group) or -O - M + (M + represents a counter cation of -O- ), and M + may be an alkali metal ion (e.g., Na + ).
  • the phosphonic acid chelating agent may include a compound having multiple phosphoryl groups, and in particular may include a compound having 3 to 8 phosphoryl groups.
  • a compound having 3 to 8 phosphoryl groups may contribute to suppression of coloration over time and further improvement of reduction of the diffusion area in the absorbent article.
  • the phosphonic acid chelating agent may include a compound having 3 or more and 7 or less, 6 or less, or 5 or less phosphoryl groups.
  • the phosphonic acid chelating agent may include a compound having 4 or more and 8 or less, 7 or less, 6 or less, or 5 or less phosphoryl groups.
  • the phosphonic acid chelating agent may include a polyalkyleneamine phosphonic acid compound having a group in which two or more hydrogen atoms have been removed from a polyalkyleneamine and two or more phosphoryl groups bonded to the alkylene group of the polyalkyleneamine.
  • the phosphonic acid chelating agent may contain one or more compounds selected from ethylenediaminetetramethylenephosphonic acid-pentasodium (EDTMP-5Na), ethylenediaminetetramethylenephosphonic acid hydrate (EDTMP-8H), and diethylenetriaminepentamethylenephosphonic acid-hetasodium (DTPMP-7Na).
  • ETMP-5Na ethylenediaminetetramethylenephosphonic acid-pentasodium
  • ETMP-8H ethylenediaminetetramethylenephosphonic acid hydrate
  • DTPMP-7Na diethylenetriaminepentamethylenephosphonic acid-hetasodium
  • the amount of the phosphonic acid chelating agent may be 200 ppm by mass or more and 15,000 ppm by mass or less relative to the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent of 200 ppm by mass or more and 15,000 ppm by mass or less relative to the amount of the polymer particles may contribute to suppression of coloration over time and further improvement of reduction of the diffusion area in the absorbent article.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 14000 mass ppm or less, based on the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 13000 mass ppm or less, based on the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 12000 mass ppm or less relative to the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 11000 mass ppm or less relative to the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 10000 mass ppm or less, based on the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 mass ppm or more, 250 mass ppm or more, 300 mass ppm or more, 350 mass ppm or more, 400 mass ppm or more, 450 mass ppm or more, 500 mass ppm or more, 550 mass ppm or more, or 600 mass ppm or more and 900 mass ppm or less, based on the amount of the polymer particles.
  • the amount of the phosphonic acid chelating agent may be 200 ppm by mass or more, 250 ppm by mass or more, 300 ppm by mass or more, 350 ppm by mass or more, 400 ppm by mass or more, 450 ppm by mass or more, 500 ppm by mass or more, 550 ppm by mass or more, or 600 ppm by mass or more and 800 ppm by mass or less, relative to the amount of the polymer particles.
  • the water-absorbent resin particles have a water-absorption speed for saline solution of 30 seconds or less.
  • the water-absorbent resin particles' water-absorption speed for saline solution here is a value measured by the Vortex method, as described in the examples described below, and a smaller value means a faster water-absorption speed.
  • the high water-absorption speed of the water-absorbent resin particles for saline solution can contribute to a reduction in the diffusion area, particularly immediately after the absorbent article absorbs urine.
  • the water absorption speed of the water absorbent resin particles to physiological saline may be 29 seconds or less, 28 seconds or less, 27 seconds or less, 26 seconds or less, 25 seconds or less, 24 seconds or less, 23 seconds or less, 22 seconds or less, 21 seconds or less, 20 seconds or less, 19 seconds or less, 18 seconds or less, 17 seconds or less, 16 seconds or less, 15 seconds or less, 14 seconds or less, 13 seconds or less, 12 seconds or less, 11 seconds or less, 10 seconds or less, 9.0 seconds or less, 8.0 seconds or less, 7.0 seconds or less, 6.0 seconds or less, or 5.0 seconds or less.
  • the water absorption speed of the water absorbent resin particles to physiological saline may be 1.0 second or more.
  • the water absorption speed of the water-absorbent resin particles with respect to physiological saline may be 1.0 seconds or more and 30 seconds or less, 29 seconds or less, 28 seconds or less, 27 seconds or less, 26 seconds or less, 25 seconds or less, 24 seconds or less, 23 seconds or less, 22 seconds or less, 21 seconds or less, 20 seconds or less, 19 seconds or less, 18 seconds or less, 17 seconds or less, 16 seconds or less, 15 seconds or less, 14 seconds or less, 13 seconds or less, 12 seconds or less, 11 seconds or less, 10 seconds or less, 9.0 seconds or less, 8.0 seconds or less, 7.0 seconds or less, 6.0 seconds or less, or 5.0 seconds or less.
  • the water-retaining capacity of the water-absorbent resin particles in physiological saline may be, for example, 25 g/g or more and 60 g/g or less, 55 g/g or less, 50 g/g or less, or 45 g/g or less.
  • the water-retaining capacity of the water-absorbent resin particles in physiological saline may be 30 g/g or more and 60 g/g or less, 55 g/g or less, 50 g/g or less, or 45 g/g or less.
  • the water-retaining capacity of the water-absorbent resin particles in physiological saline may be 35 g/g or more and 60 g/g or less, 55 g/g or less, 50 g/g or less, or 45 g/g or less.
  • the water-retaining capacity of the water-absorbent resin particles in physiological saline may be 40 g/g or more and 60 g/g or less, 55 g/g or less, 50 g/g or less, or 45 g/g or less.
  • the method for measuring the water-retaining capacity of the water-absorbent resin particles in physiological saline is as described in the examples described later.
  • the water absorption amount of the water-absorbent resin particles in physiological saline may be, for example, 50 g/g or more, 51 g/g or more, 52 g/g or more, 53 g/g or more, 54 g/g or more, 55 g/g or more, 56 g/g or more, 57 g/g or more, 58 g/g or more, 59 g/g or more, or 60 g/g or more.
  • the water absorption amount of the water-absorbent resin particles in physiological saline may be 50 g/g or more, 51 g/g or more, 52 g/g or more, 53 g/g or more, 54 g/g or more, 55 g/g or more, 56 g/g or more, 57 g/g or more, 58 g/g or more, 59 g/g or more, or 60 g/g or more and 80 g/g or less.
  • the method for measuring the water absorption amount of the water-absorbent resin particles in physiological saline is as described in the examples described later.
  • a small proportion of particles having a relatively small particle size of 150 ⁇ m or less in the water-absorbent resin particles can contribute to a reduction in the diffusion area immediately after the absorbent article absorbs urine. This is thought to be because when the proportion of particles having a small particle size is small, gel blocking due to swollen water-absorbent resin particles is unlikely to occur, and urine is likely to penetrate in the thickness direction within the absorbent body.
  • the proportion of particles having a particle size of 150 ⁇ m or less may be 20% by mass or less, 19% by mass or less, 18% by mass or less, 17% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, 13% by mass or less, 12% by mass or less, 11% by mass or less, 10% by mass or less, 9% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, or 3% by mass or less, and 0% by mass or more, relative to the total amount of water-absorbent resin particles.
  • the proportion of particles with a particle size of 150 ⁇ m or less in the water-absorbent resin particles can be measured using a JIS standard sieve, as described in the examples below.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 600 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 550 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 500 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 450 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 440 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 430 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 420 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 410 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles may be 250 ⁇ m or more, 260 ⁇ m or more, 270 ⁇ m or more, 280 ⁇ m or more, 290 ⁇ m or more, 300 ⁇ m or more, 310 ⁇ m or more, 320 ⁇ m or more, 330 ⁇ m or more, or 340 ⁇ m or more and 400 ⁇ m or less.
  • the median particle diameter of the water-absorbent resin particles can be measured using a JIS standard sieve as described in the examples described later.
  • the water-absorbent resin particles according to the present disclosure are not easily colored over time.
  • the yellowness of the water-absorbent resin particles after being left for 5 days in an environment of 70 ⁇ 2°C temperature and 90 ⁇ 2% relative humidity may be 18 or less, 15 or less, 12 or less, 10 or less, 9 or less, or 8 or less, or may be 1 or more.
  • the yellowness of the water-absorbent resin particles after being left for 5 days in an environment of 70 ⁇ 2°C temperature and 90 ⁇ 2% relative humidity may be 1 or more, and 18 or less, 15 or less, 12 or less, 10 or less, 9 or less, or 8 or less.
  • the water-absorbent resin particles may further contain other components such as a lubricant, a metal chelating agent other than a phosphonic acid-based agent, a surface modifier, a heat resistance stabilizer, an antioxidant, and an antibacterial agent.
  • the other components may be attached to the surface of the polymer particles or may penetrate into the interior of the polymer particles.
  • the lubricant may be, for example, silica particles (e.g., amorphous silica particles).
  • the amount of the lubricant e.g., silica particles
  • the amount of the lubricant may be, for example, 0.001 parts by mass to 10 parts by mass, 0.01 parts by mass to 5 parts by mass, or 0.1 parts by mass to 2 parts by mass, relative to 100 parts by mass of the polymer particles.
  • surface modifiers include polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly)aluminum chloride, and hydrates thereof; and polycation compounds such as polyethyleneimine, polyvinylamine, and polyallylamine.
  • the water-absorbent resin particles according to the present disclosure can be obtained by a method including, for example, polymerizing the water-soluble ethylenically unsaturated monomer by reverse phase suspension polymerization in a reaction liquid containing the water-soluble ethylenically unsaturated monomer, water, a dispersion medium, and a surfactant to form a particulate hydrogel polymer containing a polymer containing the water-soluble ethylenically unsaturated monomer as a monomer unit and water in the reaction liquid, aggregating the hydrogel polymer in the reaction liquid to form aggregated particles containing a plurality of hydrogel polymers, extracting a portion of the water from the reaction liquid containing the aggregated particles and water to form a concentrate, and forming a powder containing polymer particles containing a polymer from the concentrate.
  • reaction liquid to be mixed with the phosphonic acid-based chelating agent may be a reaction liquid before a hydrogel polymer is formed by a polymerization reaction, or may be a reaction liquid after a hydrogel polymer is formed by a polymerization reaction.
  • the phosphonic acid-based chelating agent can be easily introduced while avoiding its influence on the polymerization reaction.
  • the reaction liquid or a concentrate thereof may be mixed with a phosphonic acid-based chelating agent, and the powder may be further mixed with the phosphonic acid-based chelating agent.
  • reaction liquid or its concentrate When mixing the reaction liquid or its concentrate with a phosphonic acid chelating agent, a mixture containing an aqueous solution containing the phosphonic acid chelating agent and the reaction liquid or its concentrate may be stirred.
  • a powder with a phosphonic acid chelating agent an aqueous solution containing the phosphonic acid chelating agent may be sprayed onto the powder, or a mixture containing the powder containing the phosphonic acid chelating agent and the powder containing polymer particles may be stirred.
  • the mixture of the reaction liquid, concentrate, or powder with the phosphonic acid chelating agent may be heated.
  • the reaction liquid for reversed-phase suspension polymerization may mainly contain an oily liquid, which is a hydrophobic liquid composed of a hydrophobic dispersion medium, and a particulate aqueous liquid that contains water and a water-soluble ethylenically unsaturated monomer and is dispersed in the oily liquid.
  • an oily liquid which is a hydrophobic liquid composed of a hydrophobic dispersion medium, and a particulate aqueous liquid that contains water and a water-soluble ethylenically unsaturated monomer and is dispersed in the oily liquid.
  • a mixture containing the concentrate and the surface cross-linking agent may be formed by mixing the concentrate containing water at a moisture content of 20% by mass or more and 70% by mass or less based on the mass of the polymer with the surface cross-linking agent.
  • the water-absorbent resin particles were passed through a JIS Z 8801-1 standard sieve having an opening of 250 ⁇ m.
  • the median particle size was measured using the following combination of sieves (A), and when the amount remaining on the sieve was less than 50% by mass, the median particle size was measured using the following combination of sieves (B).
  • the water-absorbent resin particles were placed in the sieve located at the top stage, and the particles were classified by shaking for 20 minutes using a continuous fully automatic ultrasonic vibration sieving measuring device (Robot Sifter RPS-205, manufactured by Seishin Enterprise Co., Ltd.). After classification, the ratio (mass percentage) of the water-absorbent resin particles remaining on each sieve to the total amount was calculated. By accumulating the ratios of the fractions with larger particle diameters in order, the relationship between the sieve openings and the accumulated value of the ratio of the water-absorbent resin particles remaining on the sieve was plotted on logarithmic probability paper. The particle diameter equivalent to an accumulated mass percentage of 50% by mass was determined by connecting the plots on the probability paper with a straight line, and this value was taken as the median particle diameter.
  • the total mass of particles with a particle diameter of 150 ⁇ m or less was calculated by adding up the mass of the water-absorbent resin particles remaining on the tray in the sieve combination (A) and the mass of the sieve with a mesh size of 106 ⁇ m, the sieve with a mesh size of 75 ⁇ m, and the water-absorbent resin particles remaining on the tray in the sieve combination (B). From this and the total mass of the water-absorbent resin particles, the ratio (mass percentage) of particles with a particle diameter of 150 ⁇ m or less to the total amount of water-absorbent resin particles was calculated.
  • Each of the two laminates was sprayed with 1.0 g of water evenly using a sprayer, and then a load of 500 kPa was applied for 30 seconds. Then, 3.0 g of water-absorbent resin particles were evenly spread on the hydrophilic fiber layer to form a water-absorbent resin particle layer.
  • a second shape-retaining member (tissue) having a size of 20 cm x 20 cm and a basis weight of 16 g/ m2 was laminated on the water-absorbent resin particle layer to obtain a laminate having, from the bottom, the first shape-retaining member, the hydrophilic fiber layer, the water-absorbent resin particle layer, and the second shape-retaining member.
  • An air-through nonwoven fabric (KNH Enterprise Co., Ltd., basis weight: 25 g/m 2 ) having a size of 20 cm x 20 cm and coated with a hot melt adhesive (Henkel Japan Co., Ltd., ME- 765E ) was laminated on the second shape-retaining member of this laminate in a direction in which the hot melt adhesive contacts the second shape-retaining member, thereby obtaining an absorbent article.
  • 0.1 g of hot melt adhesive was applied to the air-through nonwoven fabric so as to form a spiral stripe pattern of 20 stripes arranged at 10 mm intervals.
  • the basis weight of the water-absorbent resin particles was 75 g/m 2 and the basis weight of the hydrophilic fiber (crushed pulp) was 45 g/m 2 .
  • FIG. 1 is a plan view showing an example of the state in which the artificial urine has diffused through the absorbent article.
  • the sample was allowed to stand for a further period of time, and 20 hours after the dropping of the artificial urine, the length d1'' of the region DA in which the artificial urine had diffused within the absorbent article 50 was measured in the longitudinal direction of the absorbent article at a position passing through the central portion C, and the length d2'' of the region DA in the lateral direction of the absorbent article at a position passing through the central portion C.

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Abstract

L'invention concerne des particules de résine absorbant l'eau comprenant : des particules de polymère qui comprennent un polymère contenant un monomère à insaturation éthylénique, soluble dans l'eau, en tant qu'unité monomère ; et un agent chélatant à base d'acide phosphonique. Les particules de résine absorbant l'eau ont une vitesse d'absorption d'eau pour une solution saline physiologique de 30 secondes ou moins, et la proportion de particules ayant un diamètre de particule de 150 µm ou moins dans les particules de résine absorbant l'eau est de 20% en masse ou moins par rapport à la quantité totale des particules de résine absorbant l'eau.
PCT/JP2024/042328 2023-12-12 2024-11-29 Particules de résine absorbant l'eau, corps absorbant l'eau, article absorbant l'eau et procédé de production de particules de résine absorbant l'eau Pending WO2025126867A1 (fr)

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JP2023-209436 2023-12-12

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014054656A1 (fr) * 2012-10-01 2014-04-10 株式会社日本触媒 Agent réduisant la poussière comprenant un composé à plusieurs métaux, absorbant d'eau contenant un composé à plusieurs métaux et leur procédé de fabrication
WO2015053372A1 (fr) * 2013-10-09 2015-04-16 株式会社日本触媒 Absorbeur d'eau particulaire comprenant une résine d'absorption d'eau en tant que constituant principal et son processus de fabrication
WO2017170605A1 (fr) * 2016-03-28 2017-10-05 株式会社日本触媒 Agent d'absorption d'eau particulaire
JP2020121090A (ja) * 2019-01-30 2020-08-13 住友精化株式会社 吸水性樹脂粒子、吸収体及び吸収性物品
WO2024204126A1 (fr) * 2023-03-27 2024-10-03 株式会社日本触媒 Absorbant d'eau particulaire, absorbeur contenant ledit absorbant d'eau particulaire, et produit sanitaire contenant ledit absorbeur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014054656A1 (fr) * 2012-10-01 2014-04-10 株式会社日本触媒 Agent réduisant la poussière comprenant un composé à plusieurs métaux, absorbant d'eau contenant un composé à plusieurs métaux et leur procédé de fabrication
WO2015053372A1 (fr) * 2013-10-09 2015-04-16 株式会社日本触媒 Absorbeur d'eau particulaire comprenant une résine d'absorption d'eau en tant que constituant principal et son processus de fabrication
WO2017170605A1 (fr) * 2016-03-28 2017-10-05 株式会社日本触媒 Agent d'absorption d'eau particulaire
JP2020121090A (ja) * 2019-01-30 2020-08-13 住友精化株式会社 吸水性樹脂粒子、吸収体及び吸収性物品
WO2024204126A1 (fr) * 2023-03-27 2024-10-03 株式会社日本触媒 Absorbant d'eau particulaire, absorbeur contenant ledit absorbant d'eau particulaire, et produit sanitaire contenant ledit absorbeur

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