WO2023100479A1 - 吸水性樹脂粒子及び吸収体 - Google Patents

吸水性樹脂粒子及び吸収体 Download PDF

Info

Publication number
WO2023100479A1
WO2023100479A1 PCT/JP2022/037928 JP2022037928W WO2023100479A1 WO 2023100479 A1 WO2023100479 A1 WO 2023100479A1 JP 2022037928 W JP2022037928 W JP 2022037928W WO 2023100479 A1 WO2023100479 A1 WO 2023100479A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
resin particles
kpa
liquid
absorbent
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/JP2022/037928
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
建太郎 佐野
大輝 澤木
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 CN202280078908.7A priority Critical patent/CN118401590A/zh
Priority to KR1020247020128A priority patent/KR20240117097A/ko
Priority to JP2023564769A priority patent/JPWO2023100479A1/ja
Priority to US18/714,280 priority patent/US20250025858A1/en
Priority to EP22900913.9A priority patent/EP4442735A4/en
Publication of WO2023100479A1 publication Critical patent/WO2023100479A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28011—Other properties, e.g. density, crush strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3268—Macromolecular compounds
    • B01J20/327—Polymers obtained by reactions involving only carbon to carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3291—Characterised by the shape of the carrier, the coating or the obtained coated product
    • B01J20/3295—Coatings made of particles, nanoparticles, fibers, nanofibers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
    • C08L101/08—Carboxyl groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/10—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C08J2300/104—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
    • C08J2300/105—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms containing carboxyl groups

Definitions

  • the present invention relates to water absorbent resin particles and absorbents.
  • Patent Document 1 discloses water-containing water-absorbing polymer particles having a predetermined strength.
  • Patent Literature 2 discloses a superabsorbent resin in which the amounts of a substance to be crosslinked and a crosslinking agent are adjusted within a predetermined range.
  • a superabsorbent resin is obtained by mixing a certain amount of inorganic powder, a certain amount of ethylene-acrylic acid copolymer and a certain amount of water with a superabsorbent resin, and then drying the mixture. A method is disclosed.
  • JP 2013-95822 A JP-A-8-53550 JP-A-8-113653
  • Absorbent articles such as paper diapers and sanitary products require an absorbent material that has the ability to diffuse liquid in order to use the product effectively. Absorbents that do not have a sufficient diffusion capacity tend to be discarded in a state in which liquid pools occur in the center of the absorbent and many water-absorbing resin particles that do not exhibit a water-absorbing function are present. Therefore, if the water-absorbing resin particles can be diffused over a wider range, more water-absorbing resin particles will function, and the entire absorbent body can be utilized without waste.
  • Blocking by swollen water-absorbing resin particles is one of the factors that hinder diffusion within the absorbent body.
  • the strength at the time of swelling is improved by strengthening the cross-linking.
  • the capacity of the absorbent is lowered at the same time, so that the amount of backflow after liquid absorption may increase.
  • An object of the present invention is to provide water-absorbing resin particles that provide an absorbent body that is excellent in diffusibility of liquid after absorbing liquid and that can suppress backflow after absorbing liquid.
  • reversion after absorbing liquid in absorbent articles is relatively likely to occur when used by 1- to 2-year-old children.
  • One of the reasons for this is that 1- to 2-year-old children are not yet sufficiently developed to walk on their own, and infants often sit on their buttocks, so the water-absorbing resin particles contained in the absorbent body are likely to be strongly pressurized.
  • the inventors of the present invention presume that Based on this speculation, the present inventors verified the pressure applied to the water-absorbent resin particles when an active 1- to 2-year-old child uses the absorbent article, and found that the pressure is 24 kPa to 96 kPa.
  • One aspect of the present invention is that the elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes is 60 to 200 [kPa / mm], and the water retention amount of physiological saline is 30 to 60 [g / g], the water absorbent resin particles.
  • Another aspect of the present invention relates to an absorbent body containing the water absorbent resin particles.
  • water-absorbent resin particles that give an absorbent body that is excellent in diffusibility of liquid after absorption and that can suppress reversion after absorption.
  • FIG. 1 is a schematic cross-sectional view showing an embodiment of an absorbent article;
  • FIG. It is a figure for demonstrating the evaluation method of diffusion distance. It is a figure which shows the measuring apparatus of the measurement of the amount of water absorption under load.
  • each component in the composition means the total amount of the plurality of substances present in the composition unless otherwise specified when there are multiple substances corresponding to each component in the composition.
  • physiological saline is an aqueous sodium chloride solution with a concentration of 0.9% by mass, and the concentration of 0.9% by mass is the concentration based on the mass of the physiological saline.
  • the water absorbent resin particles according to the present embodiment have an elasticity of 60 to 200 [kPa/mm] when pressurized from 24 kPa to 96 kPa after immersed in physiological saline for 2 minutes.
  • the lower limit of the elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes is 70 kPa / mm because it is excellent in the effect of improving the diffusibility of the liquid after absorbing the liquid and the effect of suppressing reversion after absorbing the liquid.
  • the upper limit of elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes is 190 kPa / mm, because the effect of improving the diffusibility of the liquid after absorbing the liquid and the effect of suppressing reversion after absorbing the liquid are excellent.
  • the elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes is preferably 80 to 190 kPa/mm, 90 to 190 kPa/mm, 140 to 180 kPa/mm, or 150 to 180 kPa/mm.
  • the elasticity when pressurized from 24 kPa to 96 kPa is measured by the following procedures (1) to (5).
  • (1) Accurately weigh 0.200 g of water-absorbing resin particles into an acrylic cylinder having an inner diameter of 2.0 cm and a depth of 5.0 cm, the bottom of which is covered with a nylon mesh (Nippon Special Textile, NNo. 250T), and spread it over the entire bottom. On the other hand, it is spread evenly, and 13 g of physiological saline is poured from the upper part of the acrylic cylinder in a state that the liquid does not flow out from the lower part of the cylinder (on the nylon mesh side).
  • FIG. 1 is a graph for explaining a method of calculating elasticity.
  • the horizontal axis represents the distance (unit: mm) into which the sample for elasticity evaluation was pushed, and the vertical axis represents the stress (unit: N).
  • elasticity (kPa/mm) is calculated from the slope of a straight line connecting the indentation distance at a stress of 24 kPa (7.5 N) and the indentation distance at a stress of 96 kPa (30 N).
  • the stress of 24 kPa corresponds to the local pressure on the contact surface with the buttocks when a 2-year-old child of average weight sits down, and the stress of 96 kPa corresponds to the impact that can occur when the child sits on the buttocks.
  • the elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes can be adjusted within the above range by, for example, the type and amount of material used for manufacturing the water-absorbing resin particles.
  • a coating material is used to coat at least one surface of the water-absorbing resin particles. A method of providing a coating layer on the part is exemplified.
  • the elasticity when pressurized from 24 kPa to 96 kPa after being immersed in physiological saline for 2 minutes can be adjusted by adjusting the degree of hydrophilicity of the coating layer by esterification modification (generally, if the coating layer is hydrophobic, elasticity tends to increase), adjusting the amount of coating layer in the water-absorbing resin (amount of coating material used) (generally, the more coating material used, the more elasticity tends to increase), breaking strength
  • the above range can be adjusted by providing a coating layer using a high coating material (in general, using a coating material with high breaking strength tends to increase elasticity) or by a method combining these arbitrarily.
  • the degree of neutralization should be adjusted (generally, the lower the degree of neutralization, the more elastic the water-absorbent resin particles tend to be). Adjusting the degree of hydrophilicity of the surface of the by esterification modification etc. (generally, if the water-absorbent resin particles are hydrophobic, the elasticity tends to increase) or any combination of these to adjust the elasticity to the above-mentioned range can also
  • the water-absorbing resin particles according to the present embodiment have a physiological saline water retention capacity of 30 to 60 [g/g].
  • the lower limit of the water retention amount of physiological saline is 31 g/g or more, 32 g/g or more, 33 g/g or more, because the effect of improving the diffusibility of the liquid after absorbing the liquid and the effect of suppressing the reversion after absorbing the liquid are excellent. It may be 34 g/g or greater, 35 g/g or greater, 36 g/g or greater, 37 g/g or greater, 38 g/g or greater, or 39 g/g or greater.
  • the lower limit of the water retention amount of physiological saline is 58 g/g or less, 56 g/g or less, 54 g/g or less, because the effect of improving the diffusibility of the liquid after absorbing the liquid and the effect of suppressing the reversion after absorbing the liquid are excellent. It may be 52 g/g or less, 50 g/g or less, 48 g/g or less, 46 g/g or less, 44 g/g or less, 42 g/g or less, or 40 g/g or less.
  • the water retention capacity of physiological saline is measured by the method described in Examples below.
  • the water retention capacity of physiological saline is preferably 35-60 g/g or 36-54 g/g.
  • the water absorption amount of the water-absorbing resin particles according to the present embodiment with respect to physiological saline under a load of 0.9 psi is, for example, 8.0 to 18.0 g/g, 9.0 to 18.0 g/g, 9. It may be 0-17.0 g/g, 10.0-17.0 g/g, or 10.0-16.0 g/g.
  • the amount of water absorbed in physiological saline under a load of 0.9 psi is measured by the method described in Examples below.
  • the median particle diameter of the water absorbent resin particles according to the present embodiment is, for example, 100 to 800 ⁇ m, 150 to 700 ⁇ m, 200 to 600 ⁇ m, 250 to 500 ⁇ m, 100 to 400 ⁇ m, 100 to 360 ⁇ m, 200 to 400 ⁇ m, 200 to 360 ⁇ m, It may be 250-400 ⁇ m, or 250-360 ⁇ m.
  • the median particle size of the water-absorbing resin particles is measured by the method described in Examples below.
  • the shape of the water-absorbing resin particles is not particularly limited, and may be, for example, substantially spherical, crushed, or granular, and particles may be formed by aggregating primary particles having these shapes.
  • the water absorbent resin particles may contain polymer particles.
  • the polymer particles may be crosslinked polymers formed by polymerization of monomers containing ethylenically unsaturated monomers.
  • the polymer particles may contain ethylenically unsaturated monomers as monomer units.
  • Polymer particles can be produced, for example, by a method including a step of polymerizing a monomer containing an ethylenically unsaturated monomer. Examples of the polymerization method include a reverse phase suspension polymerization method, an aqueous solution polymerization method, a bulk polymerization method, a precipitation polymerization method, and the like.
  • the ethylenically unsaturated monomer may be a water-soluble ethylenically unsaturated monomer.
  • the solubility of the water-soluble ethylenically unsaturated monomer in 100 g of water may be 1.0 g or more at 25°C.
  • water-soluble ethylenically unsaturated monomers include (meth)acrylic acid and its salts, 2-(meth)acrylamido-2-methylpropanesulfonic acid and its 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) Acrylates, as well as diethylaminopropyl (meth)acrylamide.
  • the amino group may be quaternized.
  • Ethylenically unsaturated monomers may be used alone or in combination of two or more.
  • the acidic group may be neutralized with an alkaline neutralizer before use in the polymerization reaction.
  • the neutralization degree of the ethylenically unsaturated monomer with an alkaline neutralizing agent is, for example, 10 to 100 mol%, 50 to 90 mol%, or 60 to 80 mol of the acidic groups in the ethylenically unsaturated monomer. %.
  • the ethylenically unsaturated monomer is at least one selected from the group consisting of (meth)acrylic acid and its salts, acrylamide, methacrylamide, and N,N-dimethylacrylamide. It may contain a compound of the species.
  • the ethylenically unsaturated monomer may contain at least one compound selected from the group consisting of (meth)acrylic acid and its salts, and acrylamide.
  • a monomer other than the ethylenically unsaturated monomer described above may be used as the monomer for obtaining the water absorbent resin particles.
  • Such monomers can be used, for example, by mixing with an aqueous solution containing the ethylenically unsaturated monomers described above.
  • the amount of the ethylenically unsaturated monomer used is 60 to 100 mol%, 70 to 100 mol%, 80 to 100 mol%, 90 to 100 mol%, or 95 to 100 mol% with respect to the total amount of the monomer.
  • the proportion of (meth)acrylic acid and its salt is 60 to 100 mol%, 70 to 100 mol%, 80 to 100 mol%, 90 to 100 mol%, or 95 to 100 mol% with respect to the total amount of monomers There may be.
  • cross-linking occurs due to self-crosslinking during polymerization
  • cross-linking may be promoted by using an internal cross-linking agent.
  • the use of an internal cross-linking agent facilitates control of the water absorption properties (water retention capacity, etc.) of the water-absorbing resin particles.
  • An internal cross-linking agent is usually added to the reaction solution during the polymerization reaction.
  • At least the polymer in the surface layer portion of the polymer particles may be crosslinked by reaction with a surface crosslinking agent.
  • the surface cross-linking agent may be, for example, a compound having two or more functional groups (reactive functional groups) having reactivity with functional groups derived from ethylenically unsaturated monomers.
  • the polymer particles may contain a certain amount of water in addition to the polymer of ethylenically unsaturated monomers, and may further contain various additional components inside.
  • additional ingredients include gel stabilizers, metal chelating agents, inorganic particles.
  • the particle size distribution of the water-absorbent resin particles may be adjusted by performing operations such as particle size adjustment using classification with a sieve as necessary. For example, a fraction that has passed through a sieve with an opening of 850 ⁇ m and has not passed through a sieve with an opening of 250 ⁇ m may be used as the water absorbent resin particles.
  • the water absorbent resin particles may be coated resin particles having polymer particles and a coating layer covering at least part of the surface of the polymer particles.
  • the coating layer can be formed, for example, by a method including the step of coating at least a portion of the polymer particles with a coating material to form a coating layer on at least a portion of the surface of the polymer particles.
  • the coating layer may be formed of a polymer (homopolymer or copolymer).
  • the coating layer may contain a polymer having a carboxyl group.
  • the carboxyl groups may or may not be neutralized with an alkaline neutralizing agent.
  • a polymer having a carboxyl group contains a monomer having a carboxyl group as a monomer unit. Examples of monomers having a carboxyl group include (meth)acrylic acid and salts thereof. (Meth)acrylates include, for example, sodium acrylate and potassium acrylate.
  • the polymer contained in the coating layer may contain a monomer (another monomer) other than the monomer having a carboxyl group as a monomer unit.
  • Other monomers may be, for example, substituted or unsubstituted alkenes.
  • unsubstituted alkenes examples include ethylene, propylene, and butene.
  • Substituted alkenes include, for example, styrene.
  • the polymer contained in the coating layer may be a polymer containing only a monomer having a carboxyl group as a monomer unit, and at least one selected from the group consisting of poly(meth)acrylic acid and salts thereof. may be
  • the polymer contained in the coating layer may be a copolymer containing a monomer having a carboxyl group and a substituted or unsubstituted alkene as monomer units.
  • the copolymer may be, for example, a copolymer containing (meth)acrylic acid or a salt thereof and ethylene as monomer units, and containing (meth)acrylic acid or a salt thereof and styrene as monomer units. It may be a copolymer.
  • the ratio of the coating layer in the coated resin particles may be, for example, 1 to 40 parts by mass with respect to 100 parts by mass of the polymer particles.
  • the ratio of the coating layer in the coated resin particles may be, for example, 1 part by mass or more, 5 parts by mass or more, or 8 parts by mass or more with respect to 100 parts by mass of the polymer particles, and 40 parts by mass or less, It may be 35 parts by weight or less, 30 parts by weight or less, or 25 parts by weight.
  • the coated resin particles can be obtained by a method comprising coating at least a portion of the polymer particles with a coating material to form a coating layer on at least a portion of the surface of the polymer particles.
  • the coating material may contain a liquid medium or the like in addition to the constituent components of the coating layer described above.
  • Liquid media include, for example, water and ethers such as tetrahydrofuran.
  • the coating material may be, for example, a liquid containing the polymer described above and a liquid medium in which the polymer is dissolved or dispersed.
  • the coating layer can be formed, for example, by (1) a method using an eggplant flask, (2) a method using a sprayer, or (3) a method using various granulators.
  • an inclined shallow circular container attached to the tumbling granulator is rotated, water-absorbing resin particles are supplied to the circular container, and an appropriate amount of coating material is added.
  • the solvent or dispersion medium contained in the coating material forms a coating layer on the surface of the rolling water-absorbing resin particles while a part of the water-absorbing resin particles agglomerate.
  • the step of adding the water-absorbent resin particles and the coating material may be performed multiple times, if necessary.
  • the water-absorbing resin particles When using an agitating granulator, the water-absorbing resin particles are put into a mixer equipped with the agitating granulator, and mixed by agitation, and the coating material is added. As a result, the liquid medium contained in the coating material forms a coating layer on the surface of the water-absorbing resin particles while a part of the water-absorbing resin particles are agglomerated.
  • the step of adding the water-absorbent resin particles and the coating material may be performed multiple times, if necessary. Excessive agglomeration of the water absorbent resin particles can be suppressed by controlling the shearing force of the mixer.
  • the water-absorbent resin particles are put into a container that is equipped with the fluidized-bed granulator and can send out hot air from the bottom, and the water-absorbent resin particles are fluidized in advance. Thereafter, when the coating material is sprayed from a nozzle provided in the container, the liquid medium contained in the coating material forms a coating layer on the surface of the water-absorbing resin particles while aggregating part of the water-absorbent resin particles during stirring.
  • the coating material can be sprayed multiple times as necessary. Excessive agglomeration of the water-absorbing resin particles can be suppressed by adjusting the application amount and application frequency of the coating material.
  • a fluidized bed granulator for example, a fluidized bed granulator FBD/SG (manufactured by YENCHEN MACHINERY) can be used.
  • FIG. 2 is a cross-sectional view showing an example of an absorbent article.
  • the absorbent article 100 shown in FIG. 2 includes a sheet-like absorbent body 10, core wraps 20a and 20b, a liquid permeable sheet 30, and a liquid impermeable sheet 40.
  • the liquid impermeable sheet 40, the core wrap 20b, the absorbent body 10, the core wrap 20a, and the liquid permeable sheet 30 are laminated in this order.
  • the absorbent body 10 has the water-absorbent resin particles 10a according to the above-described embodiment and a fiber layer 10b containing fibrous substances.
  • the water absorbent resin particles 10a are dispersed in the fiber layer 10b.
  • the water absorbent resin particles 10a may contain, for example, the above-described coated resin particles and other water absorbent resin particles.
  • the content of the coated resin particles may be, for example, 5 parts by mass or more, or 15 parts by mass or more, or 95 parts by mass with respect to a total of 100 parts by mass of the coated resin particles and other water-absorbent resin particles. or less, or 85 parts by mass or less.
  • the coated resin particles may be used by mixing a plurality of types of coated resin particles different from each other in at least one condition selected from the group consisting of the thickness of the coating layer, the material of the coating layer, and the material of the polymer particles. .
  • the core wrap 20a is arranged on one side of the absorbent body 10 (upper side of the absorbent body 10 in FIG. 2) while being in contact with the absorbent body 10.
  • the core wrap 20b is arranged on the other side of the absorbent body 10 (lower side of the absorbent body 10 in FIG. 2) while being in contact with the absorbent body 10.
  • the absorbent body 10 is arranged between the core wrap 20a and the core wrap 20b.
  • Examples of the core wraps 20a and 20b include tissue, nonwoven fabric, and the like.
  • the core wrap 20a and the core wrap 20b have, for example, principal surfaces of the same size as the absorber 10. As shown in FIG.
  • 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 20a while being in contact with the core wrap 20a.
  • Examples of the liquid-permeable sheet 30 include nonwoven fabrics and porous sheets made of synthetic resins such as polyethylene, polypropylene, polyester, and polyamide.
  • 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 under the core wrap 20b while being in contact with the core wrap 20b.
  • liquid-impermeable sheet 40 examples include sheets made of synthetic resins such as polyethylene, polypropylene, and polyvinyl chloride, sheets made of composite materials of these synthetic resins and non-woven fabric, and the like.
  • 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 wraps 20a, 20b.
  • the size relationship of the absorbent body 10, the core wraps 20a and 20b, 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 method of retaining the shape of the absorbent body 10 using the core wraps 20a and 20b is not particularly limited, and the absorbent body may be wrapped with a plurality of core wraps as shown in FIG. 2, or the absorbent body may be wrapped with a single core wrap. .
  • a method for improving the diffusibility of a liquid after absorption and suppressing reversion after absorption comprising: After immersion for 2 minutes, the elasticity of the water-absorbing resin particles when pressurized from 24 kPa to 96 kPa is adjusted to 60-200 [kPa/mm], and the water-holding amount of physiological saline of the water-absorbing resin particles is 30-60.
  • a method is provided comprising adjusting to [g/g].
  • Comparative example 1 Prepare a round-bottom cylindrical separable flask with an inner diameter of 11 cm and a volume of 2 L, equipped with a reflux condenser, a dropping funnel, a nitrogen gas inlet tube, and a stirrer (stirring blade having two stages of four inclined paddle blades with a blade diameter of 5 cm). bottom. 293 g of n-heptane (hydrocarbon dispersion medium) and 0.736 g of maleic anhydride-modified ethylene/propylene copolymer (polymeric dispersant, Mitsui Chemicals, Inc., Hi-Wax 1105A) were added to the separable flask. A mixture was obtained by The mixture was stirred at 300 rpm and heated to 80°C to dissolve the dispersant, and then the mixture was cooled to 55°C.
  • n-heptane hydrocarbon dispersion medium
  • maleic anhydride-modified ethylene/propylene copolymer polymeric dispersant, Mitsu
  • hydroxyl ethyl cellulose thickener, Sumitomo Seika Co., Ltd., HEC AW-15F
  • potassium persulfate water-soluble radical polymerization initiator 0.0736 g (0.272 mmol)
  • ethylene glycol diglycidyl ether Internal cross-linking agent 0.0101 g (0.0581 mmol)
  • ion-exchanged water 32.85 g were added and then dissolved to prepare a first-stage monomer aqueous solution.
  • the entire amount of the second-stage monomer aqueous solution is added to the first-stage reaction mixture.
  • a reaction liquid was obtained.
  • the inside of the system was sufficiently replaced with nitrogen while stirring the reaction solution.
  • the separable flask is immersed in a water bath at 70° C. to raise the temperature of the reaction solution, and the second-stage polymerization is performed for 5 minutes to obtain a second-stage reaction mixture (polymer particles before surface cross-linking). Obtained.
  • the temperature of the second-stage reaction mixture was raised in an oil bath of 125° C., and 267 g of water was added to the system while refluxing n-heptane by azeotropic distillation of n-heptane and water. pulled out. Subsequently, 0.0884 g (0.5075 mmol) of ethylene glycol diglycidyl ether was added as a surface cross-linking agent, and the mixture was maintained at 83° C. for 2 hours to obtain a dispersion of polymer particles after surface cross-linking.
  • the dispersion liquid of the surface-crosslinked resin particles was heated in an oil bath at 125°C to evaporate the n-heptane and dry it to obtain a dried product.
  • the dried product was passed through a sieve with an opening of 850 ⁇ m to obtain 232.8 g of polymer particles A in the form of aggregated spherical particles.
  • Comparative example 2 0.092 g (0.339 mmol) of 2,2′-azobis(2-amidinopropane) dihydrochloride was added as a first-stage monomer aqueous solution azo compound, and the amount of potassium persulfate added was 0.028 g (0.339 mmol). 102 mmol), the amount of ethylene glycol diglycidyl ether added was changed to 0.005 g (0.026 mmol), and 2,2'-azobis(2-amidinopropane)dichloromethane was added as an azo compound to the aqueous monomer solution in the second step.
  • Comparative example 3 Except for using 2.21 g (0.029 mol) of propylene glycol as the surface cross-linking agent, the procedure was carried out in the same manner as in Comparative Example 1 to obtain 500 g or more of water absorbent resin particles C (median particle size: 380 ⁇ m).
  • Comparative example 4 104.16 g of an emulsion (SR-115, manufactured by Nippon A&L Co., Ltd.) containing a polymer containing styrene and butadiene as structural units and having a non-volatile content of 48% by mass in a water-dispersed state was added to a polybeaker having an inner volume of 1 L. After that, 395.84 g of ion-exchanged water was added for dilution to obtain a coating liquid.
  • SR-115 manufactured by Nippon A&L Co., Ltd.
  • Example 1 113.63 g of an emulsion (DSM Resins & Functional Materials, NeoCryl-A1127) containing a polymer containing acrylic acid as a constitutional unit with a non-volatile content of 44% by mass in a water-dispersed state was diluted with 386.37 g of deionized water. 501.5 g of coated resin particles having a median particle size of 355 ⁇ m were obtained in the same manner as in Comparative Example 4, except that the coating liquid was obtained by the following procedure.
  • DSM Resins & Functional Materials NeoCryl-A1127
  • Example 2 185.19 g of an emulsion (Chemipearl S100, Mitsui Chemicals, Inc.) containing a polymer containing ethylene and acrylic acid as structural units with a non-volatile content of 27% by mass in a water-dispersed state is diluted with 314.81 g of deionized water and coated. 500.2 g of coated resin particles having a median particle size of 348 ⁇ m were obtained in the same manner as in Comparative Example 4 except that the liquid was prepared.
  • an emulsion (Chemipearl S100, Mitsui Chemicals, Inc.) containing a polymer containing ethylene and acrylic acid as structural units with a non-volatile content of 27% by mass in a water-dispersed state is diluted with 314.81 g of deionized water and coated. 500.2 g of coated resin particles having a median particle size of 348 ⁇ m were obtained in the same manner as in Comparative Example 4 except that the liquid was prepared.
  • Example 3 111.11 g of an emulsion (DSM Resins & Functional Materials, NeoCryl XK-188) containing a polymer containing styrene and acrylic acid as structural units having a non-volatile content of 45% by mass in an aqueous dispersion state was added to 388.89 g of ion-exchanged water. 503.6 g of coated resin particles having a median particle size of 353 ⁇ m were obtained in the same manner as in Comparative Example 4, except that the coating liquid was prepared by diluting with .
  • DSM Resins & Functional Materials NeoCryl XK-188
  • Example 4 222.22 g of an emulsion (DSM Resins & Functional Materials, NeoCryl XK-188) containing a polymer containing styrene and acrylic acid as constituent units and having a non-volatile content of 45% by mass in a water-dispersed state was mixed with 277.78 g of deionized water. 537.9 g of coated resin particles having a median particle size of 358 ⁇ m were obtained in the same manner as in Comparative Example 4 except that the coating liquid was prepared by diluting with .
  • DSM Resins & Functional Materials NeoCryl XK-188
  • Example 5 500 g or more of water absorbent resin D was obtained in the same manner as in Comparative Example 2, except that the amount of water drawn out of the system by azeotropic distillation was changed to 234.2 g. Thereafter, 505.2 g of coated resin particles having a median particle size of 359 ⁇ m were obtained in the same manner as in Example 3 except that the resin particles were water absorbent resin D.
  • ⁇ Elasticity measurement> Accurately weigh 0.200 g of water-absorbing resin into an acrylic cylinder having an inner diameter of 2.0 cm and a depth of 5.0 cm, the bottom of which is covered with a nylon mesh (Nihon Tokushu Orimono, NNo. 250T). 13 g of saline solution was poured from the top of the acrylic cylinder. After 2 minutes, the acrylic cylinder was lifted, and excess physiological saline that had not been absorbed was discharged from the bottom of the cylinder to obtain water-absorbed particles (sample for elasticity evaluation). An acrylic cylinder with a diameter of 2 cm and a height of 6 cm was connected to a load cell of a small desktop tester (SHIMADZU, EZ-TEST).
  • SHIMADZU small desktop tester
  • the load cell applied pressure to the elasticity evaluation sample from above at a rate of 1 cm/min until the stress from the elasticity evaluation sample reached 45N. After that, plot the distance and stress to which the sample for elasticity evaluation was pushed, and calculate the elasticity (kPa/mm) from the slope of the straight line connecting the pushing distance at a stress of 24 kPa (7.5 N) and the pushing distance at a stress of 96 kPa (30 N). bottom.
  • the absorbent article Place the absorbent article on a horizontal table, place a liquid injection cylinder with an opening with an inner diameter of 3 cm in the center of the absorbent article, put 80 mL of the test liquid into the cylinder at once, and check that the liquid is completely After confirming that the liquid was absorbed by the liquid, the liquid injection cylinder was removed. The same liquid charging operation was performed at intervals of 30 minutes, and the liquid charging operation was performed three times in total. After the third addition of the liquid, it was allowed to stand still for 15 minutes, and the polyethylene air-through type porous liquid-permeable sheet placed on the upper surface was removed. The length of the absorber longitudinal direction of the blue region wetted by the test liquid was measured and defined as the diffusion distance (cm).
  • the diffusion distance (cm) is, as shown in FIG.
  • the measuring device Y is composed of a burette section 71 , a conduit 72 , a measuring table 73 , and a measuring section 74 placed on the measuring table 73 .
  • the burette portion 71 includes a burette 71a extending in the vertical direction, a rubber stopper 71b arranged at the upper end of the burette 71a, a cock 71c arranged at the lower end of the burette 71a, and one end extending into the burette 71a near the cock 71c. It has an air introduction pipe 71d and a cock 71e arranged on the other end side of the air introduction pipe 71d.
  • a conduit 72 is attached between the burette portion 71 and the measuring table 73 .
  • the inner diameter of conduit 72 is 6 mm.
  • a hole with a diameter of 2 mm is formed in the central portion of the measuring table 73 and a conduit 72 is connected thereto.
  • the measuring part 74 has a cylinder 74a (made of acrylic resin (Plexiglas)), a nylon mesh 74b adhered to the bottom of the cylinder 74a, and a weight 74c.
  • the inner diameter of the cylinder 74a is 20 mm.
  • the opening of the nylon mesh 74b is 75 ⁇ m (200 mesh).
  • the weight 74c has a diameter of 19 mm and a mass of 175.7 g.
  • the weight 74 c is placed on the water absorbent resin particles 75 and can apply a load of 0.9 psi to the water absorbent resin particles 75 .
  • a weight 74c was put thereon to start the measurement. Since the same volume of air as the physiological saline absorbed by the water-absorbing resin particles 75 is rapidly and smoothly supplied to the inside of the burette 71a through the air introduction pipe, the water level of the physiological saline in the burette 71a decreases. is the amount of physiological saline absorbed by the water absorbent resin particles 75 .
  • the scale of the burette 71a is marked from 0 mL to 0.5 mL from top to bottom.
  • water-absorbing resin particles of Examples provide an absorbent body that is excellent in the diffusibility of liquid after absorption and that can suppress backflow after absorption.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Epidemiology (AREA)
  • Nanotechnology (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
PCT/JP2022/037928 2021-11-30 2022-10-11 吸水性樹脂粒子及び吸収体 Ceased WO2023100479A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202280078908.7A CN118401590A (zh) 2021-11-30 2022-10-11 吸水性树脂粒子及吸收体
KR1020247020128A KR20240117097A (ko) 2021-11-30 2022-10-11 흡수성 수지 입자 및 흡수체
JP2023564769A JPWO2023100479A1 (https=) 2021-11-30 2022-10-11
US18/714,280 US20250025858A1 (en) 2021-11-30 2022-10-11 Water absorbent resin particles and absorbent
EP22900913.9A EP4442735A4 (en) 2021-11-30 2022-10-11 WATER-ABSORBENT RESIN PARTICLES, AND WATER-ABSORBENT ARTICLE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-193913 2021-11-30
JP2021193913 2021-11-30

Publications (1)

Publication Number Publication Date
WO2023100479A1 true WO2023100479A1 (ja) 2023-06-08

Family

ID=86611976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/037928 Ceased WO2023100479A1 (ja) 2021-11-30 2022-10-11 吸水性樹脂粒子及び吸収体

Country Status (7)

Country Link
US (1) US20250025858A1 (https=)
EP (1) EP4442735A4 (https=)
JP (1) JPWO2023100479A1 (https=)
KR (1) KR20240117097A (https=)
CN (1) CN118401590A (https=)
TW (1) TW202325399A (https=)
WO (1) WO2023100479A1 (https=)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0853550A (ja) 1994-08-12 1996-02-27 Kao Corp 改良された高吸水性樹脂の製造法
JPH08113653A (ja) 1994-10-17 1996-05-07 Mitsubishi Chem Corp 高吸水性樹脂粉末の造粒法
JP2013095822A (ja) 2011-10-31 2013-05-20 Hitachi Cable Ltd 多孔質形成物およびその製造方法、含水吸水性ポリマ粒子およびその製造方法、含水吸水性ポリマ粒子の吸水速度調整方法、並びに多孔質被覆電線
JP2018164732A (ja) * 2017-03-28 2018-10-25 Ｓｄｐグローバル株式会社 吸収性物品
WO2020184389A1 (ja) * 2019-03-08 2020-09-17 住友精化株式会社 吸水性樹脂粒子
WO2021117780A1 (ja) * 2019-12-13 2021-06-17 住友精化株式会社 吸水性樹脂粒子及び吸収体
WO2022209972A1 (ja) * 2021-03-30 2022-10-06 住友精化株式会社 吸収体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016028116A (ja) * 2014-07-11 2016-02-25 住友精化株式会社 吸水性樹脂及び吸収性物品
JP5719078B1 (ja) * 2014-07-11 2015-05-13 住友精化株式会社 吸水性樹脂の製造方法
US12150844B2 (en) * 2018-12-12 2024-11-26 Sumitomo Seika Chemicals Co., Ltd. Water absorbent resin particles
EP3936549A1 (en) * 2019-03-08 2022-01-12 Sumitomo Seika Chemicals Co., Ltd. Water absorbing resin particles, absorbent article, method for manufacturing water absorbing resin particles, method for facilitating permeation of physiological saline solution into absorbent body
US20240253015A1 (en) * 2021-05-18 2024-08-01 Sumitomo Seika Chemicals Co., Ltd. Water-absorbing resin particle, absorber, and absorbent article

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0853550A (ja) 1994-08-12 1996-02-27 Kao Corp 改良された高吸水性樹脂の製造法
JPH08113653A (ja) 1994-10-17 1996-05-07 Mitsubishi Chem Corp 高吸水性樹脂粉末の造粒法
JP2013095822A (ja) 2011-10-31 2013-05-20 Hitachi Cable Ltd 多孔質形成物およびその製造方法、含水吸水性ポリマ粒子およびその製造方法、含水吸水性ポリマ粒子の吸水速度調整方法、並びに多孔質被覆電線
JP2018164732A (ja) * 2017-03-28 2018-10-25 Ｓｄｐグローバル株式会社 吸収性物品
WO2020184389A1 (ja) * 2019-03-08 2020-09-17 住友精化株式会社 吸水性樹脂粒子
WO2021117780A1 (ja) * 2019-12-13 2021-06-17 住友精化株式会社 吸水性樹脂粒子及び吸収体
WO2022209972A1 (ja) * 2021-03-30 2022-10-06 住友精化株式会社 吸収体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4442735A4

Also Published As

Publication number Publication date
TW202325399A (zh) 2023-07-01
JPWO2023100479A1 (https=) 2023-06-08
KR20240117097A (ko) 2024-07-31
EP4442735A1 (en) 2024-10-09
US20250025858A1 (en) 2025-01-23
CN118401590A (zh) 2024-07-26
EP4442735A4 (en) 2025-11-26

Similar Documents

Publication Publication Date Title
RU2653056C2 (ru) Способ получения поверхностно-постсшитых водопоглощающих полимерных частиц
KR101782188B1 (ko) 초박형 유체-흡수성 코어
EP2607383B1 (en) Water-absorbing resin
US10881555B2 (en) Fluid-absorbent article
JP5064682B2 (ja) 吸収体およびそれが用いられた吸収性物品
EP3896120B1 (en) Water-absorbing resin particles, absorbent, and absorbent article
WO2014034134A1 (en) Absorbent body and absorbent article using the same
US11053370B2 (en) Agglomerated superabsorbent polymer particles having a specific size ratio
WO2022244567A1 (ja) 吸水性樹脂粒子、吸収体及び吸収性物品
WO2022244566A1 (ja) 被覆樹脂粒子及び被覆樹脂粒子を製造する方法
WO2023100478A1 (ja) 被覆樹脂粒子の製造方法及び被覆樹脂粒子
US10875985B2 (en) Superabsorbent polymer particles comprising one or more than one area(s) with clay platelets and at least two distinct areas substantially free of clay platelets
JP2003088553A (ja) 吸収体およびそれを用いた吸収性物品
KR20230115994A (ko) 흡수성 수지 입자, 흡수체 및 흡수성 물품
WO2022014335A1 (ja) 吸収体
WO2023100479A1 (ja) 吸水性樹脂粒子及び吸収体
US10767029B2 (en) Agglomerated superabsorbent polymer particles comprising clay platelets with edge modification and/or surface modification
US20250059334A1 (en) Coated resin particles, water-absorbing resin composition, and absorbent body
JP7733572B2 (ja) 吸水性樹脂粒子
EP4480462A1 (en) Water absorbent resin particles and absorbent article
JP7776441B2 (ja) 吸水性樹脂粒子、吸収体及び吸収性物品
US20250177953A1 (en) Water absorbent resin particles and absorbent article
WO2025013731A1 (ja) 吸収体、吸収性物品、及び吸収体を製造する方法
WO2023199775A1 (ja) 複合吸収体及びそれを用いた衛生用品
WO2024135368A1 (ja) 吸収体及び吸収性物品

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22900913

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023564769

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 202280078908.7

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 18714280

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 202447042872

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 20247020128

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022900913

Country of ref document: EP

Effective date: 20240701