[go: up one dir, main page]

WO2016104374A1 - Composition de résine absorbant l'eau - Google Patents

Composition de résine absorbant l'eau Download PDF

Info

Publication number
WO2016104374A1
WO2016104374A1 PCT/JP2015/085532 JP2015085532W WO2016104374A1 WO 2016104374 A1 WO2016104374 A1 WO 2016104374A1 JP 2015085532 W JP2015085532 W JP 2015085532W WO 2016104374 A1 WO2016104374 A1 WO 2016104374A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
absorbent resin
resin composition
polymerization
mass
Prior art date
Application number
PCT/JP2015/085532
Other languages
English (en)
Japanese (ja)
Inventor
横山　秀樹
鉄博 鄙山
Original Assignee
住友精化株式会社
ユニ・チャーム株式会社
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 住友精化株式会社, ユニ・チャーム株式会社 filed Critical 住友精化株式会社
Publication of WO2016104374A1 publication Critical patent/WO2016104374A1/fr

Links

Images

Classifications

    • 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
    • C08F2/32—Polymerisation in water-in-oil emulsions
    • 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
    • C08F4/00—Polymerisation catalysts
    • C08F4/04—Azo-compounds
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • 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
    • C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
    • C08L101/14—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity the macromolecular compounds being water soluble or water swellable, e.g. aqueous gels

Definitions

  • the present invention relates to a water absorbent resin composition. More specifically, the present invention relates to a water absorbent resin composition having excellent water absorption performance, that is, high water retention performance, high liquid suction performance, and excellent liquid permeability.
  • Absorbent articles in sanitary materials such as disposable diapers, sanitary napkins, and incontinence pads are a liquid permeable sheet disposed on the side in contact with the body and a liquid impermeable sheet disposed on the side opposite to the side in contact with the body Between the two, the absorber is held.
  • the absorbent body has a property of absorbing and holding an aqueous liquid such as urine and blood excreted from the body, and is usually composed of a water absorbent resin and hydrophilic fibers as main components.
  • water-absorbent resins have been widely used in various absorbent articles such as sanitary materials such as disposable diapers and sanitary products, agricultural and horticultural materials such as water retention agents and soil conditioners, and industrial materials such as water-stopping agents and anti-condensation agents. in use.
  • Many types of water-absorbing resins are known depending on the application, such as a crosslinked product of partially neutralized acrylic acid polymer, a crosslinked product of starch-acrylate graft copolymer, vinyl alcohol, and the like.
  • Recent absorbent articles in the field of hygiene materials have a tendency to make the absorber used for them thinner in order to enhance comfort during use and convenience during carrying.
  • a water-absorbent resin composed of a polymer of a water-soluble ethylenically unsaturated monomer that is often used among water-absorbent resins
  • a water-absorbent resin composed of a polymer of a water-soluble ethylenically unsaturated monomer that is often used among water-absorbent resins
  • a compound added when polymerizing a water-soluble ethylenically unsaturated monomer in general, it is often produced using a persulfate from the viewpoint of easy control of the polymerization reaction. .
  • the present inventors have obtained a water-absorbing resin composition comprising a water-absorbing resin polymerized using an azo polymerization initiator and a wetting accelerator. It has been found that it is extremely excellent in non-pressurized DW (Demand Wettability) and liquid flow rate, and has completed the present invention.
  • the non-pressurized DW is an index indicating the liquid suction performance in a static state of the water absorbent resin composition, and is a value measured by a measurement method described later.
  • a water-absorbent resin composition comprising a water-absorbent resin obtained by polymerizing a water-soluble ethylenically unsaturated monomer in the presence of an azo polymerization initiator, and a wetting accelerator, wherein (A A water-absorbent resin composition satisfying the performances of (A) Saline retention capacity is 38 to 44 g / g (B) The 5-minute value of the non-pressurized DW is 50 mL / g or more. (C) The 60-minute value of the non-pressurized DW is 60 mL / g or more. (D) The physiological saline flow rate is 5 g / min or more.
  • Azo initiator is 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis ⁇ 2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl [1], which is at least one selected from the group consisting of propane ⁇ dihydrochloride and 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] tetrahydrate
  • the water-absorbent resin composition as described.
  • the absorbent body used in the absorbent article has a sufficient water-absorbing amount even if the content of the water-absorbent resin composition and hydrophilic fibers is reduced. Further, it is possible to reduce the thickness of the absorbent body and the absorbent article using the absorbent body. In particular, it can be suitably used for so-called Palpress absorbents, where the ratio of hydrophilic fibers used is extremely low. Absorbent articles using such fibers are extremely thin, but the frequency of liquid leakage is low, and after absorption Because of its high dry feeling, it provides a comfortable environment for the user.
  • the water-absorbent resin composition of the present invention can be suitably used for absorbent articles that are desired to be thinned, for example, disposable sanitary materials such as paper diapers, incontinence pads, sanitary napkins, and breast milk pads, especially paper diapers.
  • disposable sanitary materials such as paper diapers, incontinence pads, sanitary napkins, and breast milk pads, especially paper diapers.
  • the water-absorbent resin is usually obtained by polymerizing a water-soluble ethylenically unsaturated monomer and then crosslinking.
  • the water-soluble ethylenically unsaturated monomer may be any one that is usually used for polymerization.
  • (meth) acrylic acid in this specification, “acryl” and “methacryl” are collectively referred to as “(meth) acryl”).
  • (meth) acryl acrylic acid
  • (meth) acryl and “methacryl” are collectively referred to as “(meth) acryl”).
  • ⁇ , ⁇ -unsaturated carboxylic acids such as maleic acid, maleic anhydride and fumaric acid and their salts
  • Nonionic monomers such as acrylate, N-methylol (meth) acrylamide, polyethylene glycol mono (meth) acrylate; N, N-diethylaminoethyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, diethylaminopropyl Amino group-containing unsaturated monomers such as (meth) acrylamide
  • (meth) acrylic acid and salts thereof, (meth) acrylamide, and N, N-dimethyl (meth) acrylamide are preferable because they are easily available industrially. Used for. Furthermore, (meth) acrylic acid and its salt are used more suitably from a viewpoint that the water absorption performance of the obtained water absorbing resin is high.
  • the (meth) acrylic acid and its salt may be used by copolymerizing with other water-soluble ethylenically unsaturated monomers.
  • the (meth) acrylic acid and its salt may be 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 monomer. preferable.
  • the acid group is previously alkaline if necessary.
  • alkaline neutralizer include alkali metal salts such as sodium hydroxide, potassium hydroxide and lithium hydroxide; ammonia and the like.
  • these alkaline neutralizing agents may be used in the form of an aqueous solution in order to simplify the neutralization operation.
  • the above alkaline neutralizing agents may be used alone or in combination of two or more.
  • the neutralization of the acid group may be performed before the polymerization of the water-soluble ethylenically unsaturated monomer as a raw material, or may be performed during or after the polymerization.
  • the neutralization degree for all acid groups of the water-soluble ethylenically unsaturated monomer is preferably 10 to 100 mol%, more preferably 30 to 90 mol%. 40 to 85 mol% is more preferable.
  • the water-soluble ethylenically unsaturated monomer is usually used as an aqueous solution.
  • concentration of the water-soluble ethylenically unsaturated monomer in such an aqueous solution (hereinafter referred to as a monomer aqueous solution) is usually 20% by mass or more and saturated concentration or less, and 25 to 70% by mass. Preferably, 30 to 50% by mass is more preferable.
  • Examples of the polymerization method of the water-soluble ethylenically unsaturated monomer include a reverse phase suspension polymerization method, an aqueous solution polymerization method, a bulk polymerization method, and a precipitation polymerization method.
  • the reverse phase suspension polymerization method and the aqueous solution polymerization method are preferable from the viewpoint of the high water absorption performance of the obtained water absorbent resin and the ease of control of the polymerization, and the reverse phase suspension polymerization is preferable. Further preferred.
  • an aqueous monomer solution is dispersed in a hydrophobic organic solvent of a dispersion medium in the presence of at least one dispersion stabilizer as necessary, for example, a water-soluble radical polymerization initiator or the like.
  • a water-soluble ethylenically unsaturated monomer is polymerized.
  • a water-soluble ethylenically unsaturated monomer is further added to the water-absorbent resin obtained by the first (first stage) reversed-phase suspension polymerization. Polymerization can also be performed in multiple stages.
  • the dispersion medium a hydrophobic organic solvent that is incompatible with the aqueous monomer solution is used, and a hydrocarbon dispersion medium is preferably used.
  • the hydrocarbon dispersion medium 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 benzene, toluene and xylene.
  • Aromatic hydrocarbons such as benzene, toluene and xylene.
  • These hydrocarbon dispersion media may be used alone or in combination of two or more.
  • n-hexane, n-heptane, and cyclohexane are preferably used because they are easily available industrially, have stable quality, and are inexpensive.
  • the amount of the dispersion medium used is that the water-soluble ethylenically unsaturated monomer is uniformly dispersed, and from the viewpoint of facilitating control of the polymerization temperature, the water-soluble ethylenically unsaturated monomer used during the first stage polymerization.
  • the amount is preferably 50 to 1000 parts by mass, more preferably 70 to 700 parts by mass with respect to 100 parts by mass of the aqueous body solution.
  • the first stage polymerization means the first stage polymerization in single stage polymerization and multistage polymerization of two or more stages.
  • a surfactant may be used as the dispersion stabilizer, for example, sucrose fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitol fatty acid ester, polyoxy Ethylene sorbitol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkylallyl formaldehyde condensed polyoxyethylene ether, polyoxyethylene polyoxypropylene block copolymer, poly Oxyethylene polyoxypropyl alkyl ether, polyethylene glycol fatty acid ester, alkyl glucosi , N- alkyl gluconamide, polyoxyethylene fatty acid amides, polyoxyethylene alkyl amines, phosphoric esters of polyoxyethylene alkyl ethers,
  • sorbitan fatty acid ester polyglycerin fatty acid ester, sucrose fatty acid ester and the like are preferable from the viewpoint of dispersion stability of the monomer.
  • surfactants may be used alone or in combination of two or more.
  • the amount of the dispersion stabilizer used is a water-soluble ethylenic solvent used in the first stage polymerization in order to maintain a good dispersion state of the monomer aqueous solution in the dispersion medium and to obtain a dispersion effect commensurate with the amount used.
  • the amount is preferably 0.1 to 30 parts by mass, more preferably 0.5 to 20 parts by mass with respect to 100 parts by mass of the saturated monomer.
  • the dispersion stabilizer may be added before the start of polymerization.
  • At least an azo polymerization initiator is used as the water-soluble radical polymerization initiator.
  • the azo polymerization initiator for example, 2,2′-azobis [2- (N-phenylamidino) propane] dihydrochloride, 2,2′-azobis ⁇ 2- [N- (4-chlorophenyl) amidino] Propane ⁇ dihydrochloride, 2,2′-azobis ⁇ 2- [N- (4-hydroxyphenyl) amidino] propane ⁇ dihydrochloride, 2,2′-azobis [2- (N-benzylamidino) propane] Hydrochloride, 2,2′-azobis [2- (N-allylamidino) propane] dihydrochloride, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis ⁇ 2- [ N- (2-hydroxyethyl) amidino] propane ⁇ dihydrochloride, 2,2′-azobis [2- (5-methyl-2-imidazolin
  • 2,2′-azobis (2-amidinopropane) dihydrochloride 2,2′-azobis ⁇ 2- [1- (2 -Hydroxyethyl) -2-imidazolin-2-yl] propane ⁇ dihydrochloride and 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] tetrahydrate are preferred.
  • These azo polymerization initiators may be used alone or in combination of two or more.
  • the amount of the azo polymerization initiator used is 0.005 with respect to 100 mol of the water-soluble ethylenically unsaturated monomer used for the polymerization from the viewpoint of avoiding a rapid polymerization reaction and shortening the polymerization reaction time. ⁇ 1 mole is preferred.
  • radical polymerization initiators may be used in combination as the water-soluble radical polymerization initiator.
  • persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate; and hydrogen peroxide.
  • persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate
  • hydrogen peroxide hydrogen peroxide.
  • usage-amount at the time of combined use in order to fully express the characteristic of the water absorbing resin obtained when using an azo polymerization initiator, it is set to 0. It is preferable to use it at 5 mol or less.
  • the water-soluble radical polymerization initiator can also be used as a redox polymerization initiator by using it in combination with a reducing agent such as sodium sulfite, sodium hydrogen sulfite, ferrous sulfate, and L-ascorbic acid.
  • a reducing agent such as sodium sulfite, sodium hydrogen sulfite, ferrous sulfate, and L-ascorbic acid.
  • the reaction temperature of the polymerization reaction varies depending on the water-soluble radical polymerization initiator to be used and cannot be determined unconditionally. However, the polymerization proceeds rapidly and the polymerization time is shortened to increase the productivity and the polymerization heat. Is more preferably 20 to 110 ° C., more preferably 40 to 90 ° C., from the viewpoint of more easily removing the reaction.
  • the reaction time of the polymerization reaction is appropriately set according to the type and amount of the polymerization initiator used, the reaction temperature, etc., but is preferably 5 to 200 minutes, more preferably 10 to 100 minutes.
  • the water-absorbent resin used in the present invention may be crosslinked by adding an internal crosslinking agent to the monomer aqueous solution.
  • an internal crosslinking agent for example, a compound having two or more polymerizable unsaturated groups is used.
  • (poly) ethylene glycol In the present specification, for example, “polyethylene glycol” and “ethylene glycol” are collectively referred to as “(poly) ethylene glycol”.
  • a compound having two or more other reactive functional groups can be used.
  • glycidyl group-containing compounds such as (poly) ethylene glycol diglycidyl ether, (poly) propylene glycol diglycidyl ether, and (poly) glycerin diglycidyl ether; (poly) ethylene glycol, (poly) propylene glycol, (poly) Examples include glycerin, pentaerythritol, ethylenediamine, polyethyleneimine, and glycidyl (meth) acrylate.
  • (poly) ethylene glycol diglycidyl ether, (poly) propylene glycol diglycidyl ether, and (poly) glycerin diglycidyl ether and N, N′-methylene are preferred from the viewpoint of excellent reactivity at low temperatures.
  • Bisacrylamide is preferred.
  • These internal crosslinking agents may be used alone or in combination of two or more.
  • the amount used is 0.0001 to 2 moles per 100 moles of the water-soluble ethylenically unsaturated monomer in order to sufficiently enhance the water-absorbing performance of the resulting water-absorbent resin.
  • the amount is 0.001 to 1 mol, more preferably 0.003 to 0.5 mol, and still more preferably 0.005 to 0.05 mol.
  • the monomer aqueous solution may contain a chain transfer agent, a thickener and the like as necessary.
  • chain transfer agent include thiols, thiolic acids, secondary alcohols, hypophosphorous acid, phosphorous acid and the like. These may be used alone or in combination of two or more.
  • thickener include carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, polyethylene glycol, polyacrylic acid, polyacrylic acid neutralized product, polyacrylamide and the like.
  • a water-soluble ethylenically unsaturated monomer is added to a hydrogel (composite of a polymer produced by a polymerization reaction and water) obtained by the first-stage reversed-phase suspension polymerization.
  • a hydrogel composite of a polymer produced by a polymerization reaction and water
  • the particle diameter of the water-absorbent resin that is the aggregated particles obtained can be increased by agglomerating the particles of the hydrogel obtained in the first-stage reversed-phase suspension polymerization. For example, it becomes easier to obtain an appropriate particle size suitable for an absorbent article such as a paper diaper.
  • the reverse phase suspension polymerization reaction after the second stage is a monomer aqueous solution containing a water-soluble radical polymerization initiator, a water-soluble ethylenically unsaturated monomer, and, if necessary, other additives such as an internal crosslinking agent. Is added to the polymerization reaction solution after the reverse-phase suspension polymerization reaction in the previous stage. In addition to the aqueous monomer solution, other additives may be added to the polymerization reaction solution after the reverse phase suspension polymerization reaction in the previous stage, if necessary.
  • the reverse phase suspension polymerization reaction after the second stage it is desirable to reduce the action of the dispersion stabilizer so that the added monomer aqueous solution does not form stable droplets in the slurry.
  • the reverse phase suspension polymerization reaction in the second and subsequent stages is preferably performed.
  • the addition amount of the water-soluble ethylenically unsaturated monomer after the second stage is the water-soluble ethylenically unsaturated monomer added at the first stage from the viewpoint of obtaining a water-absorbing resin having an appropriate particle size. 50 to 300 parts by mass, preferably 80 to 220 parts by mass, more preferably 100 to 200 parts by mass, and still more preferably 120 to 180 parts by mass with respect to 100 parts by mass.
  • the second and subsequent monomer aqueous solutions can be prepared and used according to the range described in the polymerization of the first monomer aqueous solution.
  • the obtained hydrogel or aggregated particle further contains a cross-linking agent containing at least two functional groups having reactivity with the functional group derived from the water-soluble ethylenically unsaturated monomer (after It is preferable to add (denoted as a crosslinking agent).
  • a post-crosslinking agent is added and reacted (denoted as post-crosslinking reaction) to increase the cross-linking density near the surface of the water-absorbent resin, so that the obtained water-absorbent resin has an appropriate water retention ability and liquid passage.
  • Various performances such as speed increase, and the water-absorbent resin composition of the present invention is easily obtained.
  • post-crosslinking agent examples include compounds having two or more reactive functional groups.
  • polyols such as ethylene glycol, propylene glycol, 1,4-butanediol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol, polyglycerin; (poly) ethylene glycol diglycidyl ether, (poly) Polyglycidyl compounds such as ethylene glycol triglycidyl ether, (poly) glycerin diglycidyl ether, (poly) glycerin triglycidyl ether, (poly) propylene glycol polyglycidyl ether, (poly) glycerol polyglycidyl ether; epichlorohydrin, epibromohydrin Haloepoxy compounds such as ⁇ -methylepichlorohydrin; 2,4-tolylene diisocyanate, hexamethylene diisocyanate and
  • the amount of the post-crosslinking agent added is preferably from the viewpoint of increasing the crosslinking density in the vicinity of the surface of the water-absorbent resin sufficiently and normally with respect to the total amount of the water-soluble ethylenically unsaturated monomer used in the polymerization of 100 mol.
  • the amount is 0.001 to 1 mol, more preferably 0.005 to 0.5 mol, and still more preferably 0.01 to 0.2 mol.
  • the post-crosslinking agent is added from the viewpoint of uniformly dispersing the post-crosslinking agent in the hydrogel or aggregated particles, for example, in the presence of a dispersion medium in the hydrogel or aggregated particles obtained by reverse phase suspension polymerization.
  • the post-crosslinking agent solution may be added, or the post-crosslinking agent solution may be spray-added to the hydrogel or aggregated particles with the dispersion medium removed.
  • the post-crosslinking agent is dissolved in a hydrophilic solvent such as water and added as a post-crosslinking agent solution.
  • the post-crosslinking reaction may be performed once or divided into a plurality of times of two or more times.
  • the post-crosslinking agent may be added after the polymerization reaction of the water-soluble ethylenically unsaturated monomer is almost completed. It is preferably carried out in the presence of moisture in the range of 200 parts by weight, more preferably in the range of 5 to 150 parts by weight, further preferably in the range of 10 to 100 parts by weight, and still more preferably in the range of 15 to 80 parts by weight. .
  • the solid content of the water-absorbent resin in the hydrogel or aggregated particles can be calculated from the amount of the water-soluble ethylenically unsaturated monomer used in the polymerization reaction.
  • the amount of water contained in the hydrogel or aggregated particles in each step after the polymerization step is calculated by subtracting the amount of water removed from the polymerized hydrogel or aggregated particles from the amount of water contained in the monomer aqueous solution. it can.
  • the post-crosslinking reaction in the vicinity of the particle surface of the water-absorbent resin can be more suitably performed by adjusting the amount of water during the post-crosslinking reaction.
  • the moisture can be removed from the hydrated gel or aggregated particles.
  • water may be distilled off together with the dispersion medium using a dryer or the like. In that case, drying can also be performed under reduced pressure.
  • azeotropic dehydration may be used in which only water is removed from the system by heating the dispersion medium and refluxing only the dispersion medium out of the distilled water and the dispersion medium.
  • the reaction temperature in the post-crosslinking reaction is, for example, preferably 50 to 250 ° C., more preferably 60 to 180 ° C., further preferably 60 to 140 ° C., and still more preferably 70 to 120 ° C.
  • the reaction time in the post-crosslinking reaction is preferably, for example, 5 to 600 minutes, more preferably 20 to 500 minutes, further preferably 30 to 400 minutes, and further preferably 60 to 300 minutes.
  • the water absorbent resin used in the water absorbent resin composition of the present invention can be obtained by drying the water-containing gel or aggregated particles. Drying may be performed at normal pressure or reduced pressure, and may be performed under an air stream such as nitrogen in order to increase drying efficiency.
  • the drying temperature is preferably 70 to 250 ° C, more preferably 80 to 180 ° C, further preferably 80 to 140 ° C, and still more preferably 90 to 130 ° C. In the case of carrying out under reduced pressure, the drying temperature is preferably 50 to 120 ° C, more preferably 60 to 110 ° C.
  • the water absorbent resin used in the water absorbent resin composition of the present invention may contain a hydrophobic substance.
  • the hydrophobic substance used in the present invention include maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene / propylene copolymer, maleic anhydride / ethylene copolymer, maleic anhydride / propylene.
  • Copolymer polyolefin resin or polyolefin resin derivative such as maleic anhydride / ethylene / propylene copolymer, oxidized polyethylene, oxidized polypropylene, oxidized ethylene / propylene copolymer; lauric acid, stearic acid, oleic acid, and Long chain fatty acids having 12 to 25 carbon atoms such as behenic acid; methyl laurate, ethyl laurate, methyl stearate, ethyl stearate, methyl oleate, ethyl oleate, glycerol laurate monoester, glycerol stearate mono Long chain fatty acid esters consisting of fatty acids having 12 to 25 carbon atoms and alcohols having 1 to 5 carbon atoms such as stealth and glycerin oleic acid monoesters; natural waxes such as beeswax, spermaceti, palm wax, goby wax
  • maleic anhydride-modified polyethylene maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene / propylene copolymer, oxidized polyethylene, Oxidized polypropylene, oxidized ethylene / propylene copolymer and the like are preferable.
  • These hydrophobic substances may be used alone or in combination of two or more.
  • the hydrophobic substance As a method for adding the hydrophobic substance, from the viewpoint that it is more preferable that the hydrophobic substance be uniformly present in the vicinity of the surface of the water absorbent resin, the hydrophobic substance is added to the water absorbent resin by dissolving or dispersing in a solvent, and then dried.
  • the method of making it preferable is. In reverse phase suspension polymerization, it can be uniformly present in the vicinity of the surface by dissolving or dispersing in a dispersion medium and distilling off the dispersion medium.
  • the addition amount of the hydrophobic substance is 0.05 to 4 with respect to 100 parts by mass of the solid content of the water-absorbent resin, from the viewpoint of appropriately hydrophobizing the vicinity of the surface of the water-absorbent resin and further improving the liquid permeability of the swelling gel.
  • Part by mass is preferable, and 0.2 to 2 parts by mass is more preferable.
  • the method of adding a hydrophobic substance is a method of adding a liquid hydrophobic substance or a powdery hydrophobic substance in a solution in a solvent or the like, or a method of adding a fine powdery hydrophobic substance in a powder state.
  • the form added as a solution is preferable so that it can exist uniformly in the surface vicinity of a water absorbing resin.
  • a hydrophobic substance has thermoplasticity, it becomes possible to disperse
  • the addition timing of the hydrophobic substance may be any stage during the production of the water-absorbent resin, and may be any of during the monomer polymerization process, after the polymerization process, during the drying process of the hydrogel or aggregated particles, and after the drying process. Especially, it is preferable to add before the drying process of a water-containing gel or an aggregated particle from a viewpoint which a hydrophobic substance tends to exist uniformly in the surface vicinity of a water absorbing resin.
  • the water-containing gel or aggregated particles are usually dried to a moisture content of 15% or less, preferably 10% or less, and obtained as a water absorbent resin.
  • the water-absorbing resin composition of the present invention can be obtained by mixing the water-absorbing resin obtained as described above with a wetting accelerator.
  • the water-absorbing resin may be classified with a sieve or the like as necessary to remove coarse particles and fine particles.
  • Examples of the wetting accelerator used in the present invention include hydrophilic inorganic fine powders such as silicon dioxide, titanium oxide, aluminum oxide, kaolin, talc, bentonite and zeolite; and many such as glycerin, pentaerythritol, sorbitol, and mannitol.
  • Examples include monohydric alcohol compounds; hydrophilic polymer fine powders having a viscosity average molecular weight of 10,000 or less, such as polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, and polyacrylate.
  • hydrophilic inorganic fine powder is preferable from the viewpoint of achieving both high liquid absorption performance and high liquid permeability, and silicon dioxide, titanium oxide, aluminum oxide, and zeolite are more preferable.
  • wetting accelerators may be used alone or in combination of two or more.
  • the addition amount of the wetting accelerator is preferably 0.1 part by mass or more and 3 parts by mass or less, and 0.2 part by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the water absorbent resin from the viewpoint of expressing wettability. More preferably, it is 0.4 to 1 part by mass.
  • Examples of the method of adding the wet accelerator include a method of adding a liquid or powder wet promoter in a solution in a solvent or the like, or a method of adding a fine powder wet promoter in a powder state.
  • a method of powder-mixing a fine powder wet accelerator and a water absorbent resin is preferable.
  • a general mixer can be used for mixing the wetting accelerator and the water absorbent resin.
  • a cylindrical mixer, a ribbon mixer, a conical screw mixer, a V mixer, a double cone mixer, a fluidized mixer, a gravity mixer, or the like can be used.
  • the water absorbent resin composition of the present invention may further contain other additives for the purpose of imparting other functions.
  • additives include antibacterial agents, deodorants, stabilizers, anti-coloring agents and the like.
  • the saline retention capacity (A) of the water-absorbent resin composition of the present invention is 38 g / g or more, preferably 39 g / g or more, more preferably 40 g / g or more from the viewpoint of increasing the absorption capacity of the absorbent article. .
  • it is 44 g / g or less, preferably 43 g / g or less, and more preferably 42 g / g or less.
  • the physiological saline water retention capacity (A) of the water-absorbent resin is a value measured by the measurement method described in “(1) physiological saline water retention capacity” described later.
  • the 5-minute value (B) of non-pressurized DW of the water absorbent resin composition of the present invention is 50 mL / g or more from the viewpoint of increasing the initial absorption rate of the absorbent body using the water absorbent resin composition of the present invention.
  • 53 mL / g or more is preferable, 55 mL / g or more is more preferable, and 56 mL / g or more is more preferable.
  • 100 mL / g or less is preferable, 90 mL / g or less is more preferable, and 80 mL / g or less is further more preferable from a viewpoint of maintaining a user's comfort because it becomes difficult to cause liquid leakage.
  • the 60-minute value (C) of the non-pressurized DW is 60 mL / g or more, preferably 63 mL / g or more, more preferably 65 mL / g or more, and 66 mL / g or more from the same viewpoint as the above (B). Is more preferable. 110 mL / g or less is preferable, 100 mL / g or less is more preferable, and 90 mL / g or less is more preferable.
  • the 5-minute value (B) of the non-pressurized DW and the 60-minute value (C) of the non-pressurized DW of the water-absorbent resin are measured by the measurement method described in “(2) Non-pressurized DW” described later. It is a measured value.
  • the physiological saline flow rate (D) of the water-absorbent resin composition of the present invention is 5 g / min or more from the viewpoint of enhancing liquid diffusibility in an absorbent article using the water-absorbent resin composition of the present invention, 6 g / min or more is preferable, 7 g / min or more is more preferable, and 8 g / min or more is more preferable.
  • it is preferably 20 g / min or less, more preferably 15 g / min or less, and even more preferably 13 g / min or less.
  • the physiological saline flow rate (D) of the water-absorbent resin composition is a value measured by a measurement method described in “(3) Saline flow rate” described later.
  • the median particle diameter of the water absorbent resin composition of the present invention is preferably 200 to 600 ⁇ m, more preferably 250 to 550 ⁇ m, further preferably 280 to 500 ⁇ m, and 300 to 450 ⁇ m. Is even more preferable. By setting the median particle diameter in the above range, gel blocking during liquid absorption by fine particles and deterioration of the tactile sensation of the absorbent article due to coarse particles can be avoided.
  • the median particle diameter of the water absorbent resin composition is a value measured by the measurement method described in “(4) Median particle diameter” described later.
  • Physiological saline water retention capacity In a 500 mL beaker, 500 g of physiological saline (0.9 mass% sodium chloride aqueous solution) was weighed and stirred at 600 rpm, while 2.00 g of the water absorbent resin composition was It was dispersed so as not to occur. The mixture was allowed to stand for 30 minutes in a stirred state to sufficiently swell the water absorbent resin composition. Then, all the contents of the beaker (swelling gel and saline) are poured into a cotton bag (Membroad No. 6060, width 100 mm x length 200 mm), the upper part of the cotton bag is tied with a rubber band, and the centrifugal force is set to 167G.
  • physiological saline 0.1% sodium chloride aqueous solution
  • the cotton bag was dehydrated for 1 minute using the dewatering machine (product number: H-122, manufactured by Kokusan Centrifuge Co., Ltd.), and the weight Wa (g) of the cotton bag containing the swollen gel after dehydration was measured.
  • the non-pressurized DW of the water absorbent resin composition was measured using the measuring apparatus shown in FIG. In addition, the measurement was implemented 5 times with respect to one type of water absorbing resin composition, and the average value of 3 points
  • the measurement apparatus includes a burette unit 1 and a conduit 2, a measurement table 3, a nylon mesh sheet 4, a frame 6, and a clamp 7.
  • the burette unit 1 has a rubber stopper 14 connected to the upper part of the buret 10 in which the scale is written in units of 0.2 mL from 0 to 100 mL from the upper side, and an air introduction pipe 11 and a cock 12 connected to the lower part. Has a cock 13 at its tip.
  • the bullet 1 was fixed with a clamp 7.
  • a conduit 2 having an inner diameter of 6 mm was attached between the burette unit 1 and the measuring table 3.
  • a hole with a diameter of 2 mm was formed at the center of the measuring table 3, and the conduit 2 was connected.
  • the measurement table 3 was supported by a gantry 6. Using such a measuring apparatus, the measurement of non-pressurized DW was performed according to the following procedure. The measurement was performed in a room with a temperature of 25 ⁇ 1 ° C. and a humidity of 60 ⁇ 10% using physiological saline adjusted to 25 ⁇ 1 ° C.
  • the physiological saline is supplied with the rubber stopper 14 removed, the conduit 2 is in a liquid-sealed state, and the physiological saline is contained so as not to contain air bubbles from the connection portion of the burette portion 1 to the conduit 2 to the upper portion of the burette portion 1 scale. Filled with water. At this time, the physiological saline was prevented from entering the air introduction tube. After sealing with the rubber stopper 14, the cock 13 and the cock 12 are opened so that the surface of the physiological saline coming out from the conduit port at the center of the measuring table 3 and the upper surface of the measuring table 3 are at the same height. The height of the measuring table 3 was adjusted. After adjustment, the zero point was confirmed by reading the scale of the bullet 10.
  • a nylon mesh sheet 4 (100 mm ⁇ 100 mm, 250 mesh, thickness of about 50 ⁇ m) was prepared, and a cylinder with an inner diameter of 30 mm was placed in the center. 1.00 g of the water-absorbent resin composition 5 was weighed out, and the entire amount was uniformly introduced into the cylinder, and then the cylinder was carefully removed.
  • the nylon sheet 4 on which the water-absorbent resin composition 5 is dispersed in the central portion is quickly moved onto the conduit port of the measurement table 3 to the extent that the water-absorbent resin composition 5 is not dissipated, and measurement is started. did.
  • the time when the first bubble generation from the air introduction tube 11 to the burette 10 was observed was regarded as the start of water absorption.
  • the amount of decrease in physiological saline in the burette 10 (that is, the amount of physiological saline absorbed by the water absorbent resin composition 5) is sequentially read, and the physiological saline 5 minutes after the start of water absorption of the water absorbent resin composition 5
  • the weight loss Wc (mL) was read as no-pressure DW per 1.00 g of the water-absorbent resin composition, and the no-pressure DW for 5 minutes was determined by the following formula.
  • Nylon mesh sheet (250 mesh) is bonded to the measuring part, which is the same nylon as the cylindrical container (A) 21 made of Plexiglas having an inner diameter of 19 mm, an outer diameter of 25 mm, a height of 120 mm, and a weight of about 30 g. It consists of a plexiglass cylindrical container (B) 22 having an inner diameter of 26 mm, an outer diameter of 40 mm, and a height of 80 mm, and a swelling gel 23, to which a mesh sheet is bonded.
  • the metal mesh 24 on which the measurement unit is placed has a size of 100 mm ⁇ 100 mm and has a 2 mm square lattice-shaped opening.
  • the inner diameter of the petri dish 25 is about 90 mm.
  • the measurement was performed at room temperature of about 25 ° C.
  • the cylindrical container (B) 22 was uniformly charged with 0.20 g of the water-absorbent resin composition classified in advance to a size of 250 to 500 ⁇ m, and the cylindrical container (A) 21 was inserted from above to form a measuring part.
  • the swollen gel 23 was formed by immersing the mesh side of the measurement part in a petri dish containing an appropriate amount of physiological saline and allowing it to swell for 30 minutes.
  • the whole measuring part was moved onto an empty petri dish, a 200 g weight was slowly placed on top of the cylindrical container (A) 21, and the swollen gel 23 was loaded for 3 minutes.
  • a metal mesh 24 having a mesh opening of 2 mm was placed, and a measurement unit including a swollen gel 23 was placed.
  • the stopwatch was started simultaneously with the addition of physiological saline from the upper part of the cylindrical container (A) 21. Thereafter, physiological saline was appropriately added so that the liquid level was maintained at 6 to 7 cm from the lower end of the cylindrical container (A) until the measurement was completed.
  • the mass of the water-absorbent resin composition remaining on each sieve is calculated as a percentage by mass with respect to the total amount, and by integrating in order from the larger particle size, the water-absorbent resin remaining on the sieve mesh and the sieve
  • the relationship with the integrated value of the mass percentage of the composition was plotted on a logarithmic probability paper. By connecting the plots on the probability paper with a straight line, the particle diameter corresponding to an integrated mass percentage of 50 mass% was defined as the median particle diameter.
  • a non-woven fabric 43 in which the adhesive is uniformly sprayed is prepared in the same manner as described above, and the water-absorbing resin composition is spread on the non-woven fabric so that the surface of the adhesive is on the bottom. Gently press and glue. Further, each side of the outer periphery was heat-sealed with a heat sealer 0.5 cm inside from the end, to prepare a test absorber 40.
  • Example 1 As a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirrer, a round bottom cylindrical separable flask having an inner diameter of 100 mm equipped with a stirring blade having two inclined paddle blades with a blade diameter of 50 mm in two stages was prepared. To this flask, 340 g of n-heptane was taken, 0.8 g of sucrose stearate ester of HLB3 (manufactured by Mitsubishi Chemical Foods, Ryoto Sugar Ester S-370) was added as a surfactant, and the temperature was raised to 60 ° C. After dissolving the surfactant, it was cooled to 50 ° C.
  • HLB3 sucrose stearate ester of HLB3
  • the rotation speed of the stirrer was set to 450 rpm, the monomer aqueous solution was added to the separable flask, and the system was replaced with nitrogen, maintained at 35 ° C. for 30 minutes, and then immersed in a 70 ° C. water bath.
  • the first stage post-polymerization slurry was obtained by raising the temperature and performing polymerization.
  • the temperature was raised using an oil bath at 125 ° C., and water and n-heptane were azeotroped, so that the total amount of water collected in the fractionating tube was reduced to 245 g while refluxing n-heptane.
  • 4.42 g of a 2% by weight aqueous solution of ethylene glycol diglycidyl ether was added as a post-crosslinking agent, and the mixture was allowed to react at an internal temperature of 80 ° C. for 2 hours.
  • the product further heated to distill off n-heptane and water was passed through a 850 ⁇ m sieve to obtain 220 g of a water absorbent resin in the form of particles in which spherical primary particles were aggregated. .
  • 100 g of this water-absorbing resin was fractionated, and 1.00 g (1.0% by mass with respect to the water-absorbing resin) of hydrophilic silica (Evonik Degussa Japan Co., Ltd .: Carplex # 80) was added.
  • the mixture was mixed for 30 minutes to obtain the water absorbent resin composition of Example 1.
  • the median particle diameter of the obtained water absorbent resin composition was 460 ⁇ m. Table 1 shows the measurement results of each performance.
  • Example 2 In Example 1, a solution in which 3.4 g of a hydrophobic maleic anhydride-modified ethylene / propylene copolymer (manufactured by Mitsui Chemicals, high wax 1105A) was pre-heated in 30.6 g of n-heptane and kept warm, The mixture was added to the system after the post-crosslinking reaction for 2 hours, stirred and mixed for 10 minutes at 81 ° C., further heated to distill off n-heptane and water, and passed through a 850 ⁇ m sieve. As a result, 224 g of a water-absorbing resin having a form of particles in which spherical primary particles were aggregated was obtained.
  • a hydrophobic maleic anhydride-modified ethylene / propylene copolymer manufactured by Mitsui Chemicals, high wax 1105A
  • Example 3 As a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirrer, a round bottom cylindrical separable flask having an inner diameter of 100 mm equipped with a stirring blade having two inclined paddle blades with a blade diameter of 50 mm in two stages was prepared.
  • the rotation speed of the stirrer was set to 450 rpm, the monomer aqueous solution was added to the separable flask, and the system was replaced with nitrogen, maintained at 35 ° C. for 30 minutes, and then immersed in a 70 ° C. water bath.
  • the first stage post-polymerization slurry was obtained by raising the temperature and performing polymerization.
  • the temperature was raised using an oil bath at 125 ° C., and water and n-heptane were azeotroped, so that the total amount of water collected in the fractionating tube was reduced to 245 g while refluxing n-heptane.
  • 4.42 g of a 2% by weight aqueous solution of ethylene glycol diglycidyl ether was added as a post-crosslinking agent, and the mixture was allowed to react at an internal temperature of 80 ° C. for 2 hours.
  • Example 4 As a reflux condenser, a dropping funnel, a nitrogen gas introduction pipe, and a stirrer, a round bottom cylindrical separable flask having an inner diameter of 100 mm equipped with a stirring blade having two inclined paddle blades with a blade diameter of 50 mm in two stages was prepared. 340 g of n-heptane was taken into this flask, 0.8 g of sucrose stearate ester of HLB3 (manufactured by Mitsubishi Chemical Foods, Ryoto Sugar Ester S-370) as a surfactant, and oxidized ethylene / propylene as a hydrophobic substance. After adding 0.8 g of a copolymer (manufactured by Mitsui Chemicals, High Wax 220MP), the temperature was raised to 90 ° C. to dissolve the surfactant, and then cooled to 50 ° C.
  • the rotation speed of the stirrer was set to 450 rpm, the monomer aqueous solution was added to the separable flask, and the system was replaced with nitrogen, maintained at 35 ° C. for 30 minutes, and then immersed in a 70 ° C. water bath.
  • the first stage post-polymerization slurry was obtained by raising the temperature and performing polymerization.
  • the temperature was raised using an oil bath at 125 ° C., and water and n-heptane were azeotroped, so that the total amount of water collected in the fractionating tube was 240 g while refluxing n-heptane.
  • 4.42 g of a 2% by weight aqueous solution of ethylene glycol diglycidyl ether was added and held at an internal temperature of 80 ° C. for 2 hours, followed by further heating to distill off n-heptane and dry it.
  • Comparative Example 1 In Example 2, the water absorbent resin of Comparative Example 1 was obtained by adding no wetting accelerator to the obtained water absorbent resin.
  • Comparative Example 2 In Example 3, the same procedure was followed, except that potassium persulfate was used in place of the first and second stage initiator 2,2′-azobis (2-amidinopropane) dihydrochloride. 230 g was obtained. 80 g of this water-absorbing resin was fractionated and 0.80 g (1.0% by mass with respect to the water-absorbing resin) of hydrophilic silica (Evonik Degussa Japan Co., Ltd .: Carplex # 80) was added. The mixture was mixed for 30 minutes to obtain a water absorbent resin composition of Comparative Example 2. The median particle diameter of the obtained water absorbent resin composition was 390 ⁇ m. Table 1 shows the measurement results of each performance.
  • Comparative Example 3 Japanese Unexamined Patent Application Publication No. 2006-176570, Example 1
  • a 1000 mL five-necked cylindrical round bottom flask equipped with a stirrer, reflux condenser, dropping funnel, thermometer and nitrogen gas inlet tube is 340 g of n-heptane and sucrose fatty acid ester with an HLB of 3.0 (Mitsubishi Chemical) 0.92 g was added, dispersed, heated and dissolved, and then cooled to 55 ° C.
  • the monomer aqueous solution for the first stage polymerization is added to and dispersed in the five-necked cylindrical round bottom flask with stirring, and the system is sufficiently replaced with nitrogen.
  • test absorbers were prepared, and the permeation time and the liquid return amount were measured.
  • an absorber in which the frequency of liquid leakage during urination and the amount of liquid returned are significantly reduced, and an absorbent article using the same, while being thinner than ever before. Therefore, such an absorbent article is used suitably for hygiene material use.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Polymerisation Methods In General (AREA)
  • Polymerization Catalysts (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne une composition de résine absorbant l'eau présentant les caractéristiques (A) à (D) et comprenant : une résine absorbant l'eau obtenue par polymérisation d'un monomère éthylénique insaturé hydrosoluble en présence d'un initiateur de polymérisation azoïque ; et un accélérateur d'humidité. (A) une rétention en solution saline physiologique allant de 38 à 44 g/g ; (B) une valeur à cinq minutes de la mouillabilité exigée (Demand Wettability (DW)) sous aucune pression d'au moins 50 mL/g ; (C) une valeur à 60 minutes de la mouillabilité exigée (DW) sous aucune pression d'au moins 60 mL/g ; et (D) une vitesse de passage de solution saline physiologique d'au moins 5 g/min.
PCT/JP2015/085532 2014-12-25 2015-12-18 Composition de résine absorbant l'eau WO2016104374A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014263245A JP2016121297A (ja) 2014-12-25 2014-12-25 吸水性樹脂組成物
JP2014-263245 2014-12-25

Publications (1)

Publication Number Publication Date
WO2016104374A1 true WO2016104374A1 (fr) 2016-06-30

Family

ID=56150393

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/085532 WO2016104374A1 (fr) 2014-12-25 2015-12-18 Composition de résine absorbant l'eau

Country Status (2)

Country Link
JP (1) JP2016121297A (fr)
WO (1) WO2016104374A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018155591A1 (fr) 2017-02-22 2018-08-30 株式会社日本触媒 Feuille absorbant l'eau, feuille allongée absorbant l'eau, et article absorbant
WO2020122219A1 (fr) * 2018-12-12 2020-06-18 住友精化株式会社 Particules de résine absorbantes, corps absorbant, article absorbant, et procédé de mesure de puissance d'absorption de liquide
CN113543877A (zh) * 2019-03-08 2021-10-22 住友精化株式会社 吸水性树脂颗粒、吸收体、吸收性物品、吸水性树脂颗粒的通液维持率的测定方法及吸水性树脂颗粒的制造方法
US20220015959A1 (en) * 2018-12-12 2022-01-20 Sumitomo Seika Chemicals Co., Ltd. Water-absorbent resin particles, water-absorbent article, and method for manufacturing same
EP3954728A4 (fr) * 2019-04-23 2022-12-28 Sumitomo Seika Chemicals Co., Ltd. Particules de resine absorbante
WO2023189679A1 (fr) * 2022-03-29 2023-10-05 住友精化株式会社 Particules de résine absorbant l'eau
WO2024072076A1 (fr) 2022-09-28 2024-04-04 주식회사 엘지화학 Polymère superabsorbant
US12178691B2 (en) 2018-12-12 2024-12-31 Sumitomo Seika Chemicals Co., Ltd. Absorbent resin particles, absorbent article and production method therefor
US12246303B2 (en) 2018-12-12 2025-03-11 Sumitomo Seika Chemicals Co., Ltd. Water-absorbing resin particles and absorbent article
US12274999B2 (en) 2018-12-12 2025-04-15 Sumitomo Seika Chemicals Co., Ltd. Water absorbent resin particles, absorbent, absorbent article and liquid suction power measurement method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6126321B1 (ja) * 2017-02-01 2017-05-10 ユニ・チャーム株式会社 母乳パッド
JP7174769B2 (ja) * 2018-09-27 2022-11-17 株式会社日本触媒 吸水性樹脂の製造方法
JPWO2020218160A1 (fr) * 2019-04-23 2020-10-29
WO2020218167A1 (fr) * 2019-04-23 2020-10-29 住友精化株式会社 Particules de résine absorbante
US20230182112A1 (en) * 2020-04-27 2023-06-15 Sumitomo Seika Chemicals Co., Ltd. Particulate water-absorbing resin composition, production method therefor, absorbent object, and absorbent article

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500670A (en) * 1983-11-22 1985-02-19 The Dow Chemical Company Composite mixtures for improving gel strength of water absorbent gels
JP2000109714A (ja) * 1998-08-07 2000-04-18 Sanyo Chem Ind Ltd 吸水剤およびその製造法
JP2003176421A (ja) * 2001-12-12 2003-06-24 San-Dia Polymer Ltd 吸収剤、これを用いてなる吸収体及び吸収性物品
JP2004261797A (ja) * 2003-02-10 2004-09-24 Nippon Shokubai Co Ltd 吸水剤
JP2006176570A (ja) * 2004-12-21 2006-07-06 Sumitomo Seika Chem Co Ltd 吸水性樹脂粒子の製造方法及びそれを用いた衛生材料

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500670A (en) * 1983-11-22 1985-02-19 The Dow Chemical Company Composite mixtures for improving gel strength of water absorbent gels
US4500670B1 (en) * 1983-11-22 1994-12-27 Dow Chemical Co Composite mixtures for improving gel strength of water absorbent gels
JP2000109714A (ja) * 1998-08-07 2000-04-18 Sanyo Chem Ind Ltd 吸水剤およびその製造法
JP2003176421A (ja) * 2001-12-12 2003-06-24 San-Dia Polymer Ltd 吸収剤、これを用いてなる吸収体及び吸収性物品
JP2004261797A (ja) * 2003-02-10 2004-09-24 Nippon Shokubai Co Ltd 吸水剤
JP2006176570A (ja) * 2004-12-21 2006-07-06 Sumitomo Seika Chem Co Ltd 吸水性樹脂粒子の製造方法及びそれを用いた衛生材料

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018155591A1 (fr) 2017-02-22 2018-08-30 株式会社日本触媒 Feuille absorbant l'eau, feuille allongée absorbant l'eau, et article absorbant
WO2020122219A1 (fr) * 2018-12-12 2020-06-18 住友精化株式会社 Particules de résine absorbantes, corps absorbant, article absorbant, et procédé de mesure de puissance d'absorption de liquide
US20220015959A1 (en) * 2018-12-12 2022-01-20 Sumitomo Seika Chemicals Co., Ltd. Water-absorbent resin particles, water-absorbent article, and method for manufacturing same
EP3896118A4 (fr) * 2018-12-12 2023-01-11 Sumitomo Seika Chemicals Co., Ltd. Particules de résine absorbantes, corps absorbant, article absorbant, et procédé de mesure de puissance d'absorption de liquide
US12161537B2 (en) 2018-12-12 2024-12-10 Sumitomo Seika Chemicals Co., Ltd. Water-absorbent resin particles, water-absorbent article, and method for manufacturing same
US12178691B2 (en) 2018-12-12 2024-12-31 Sumitomo Seika Chemicals Co., Ltd. Absorbent resin particles, absorbent article and production method therefor
US12246303B2 (en) 2018-12-12 2025-03-11 Sumitomo Seika Chemicals Co., Ltd. Water-absorbing resin particles and absorbent article
US12274999B2 (en) 2018-12-12 2025-04-15 Sumitomo Seika Chemicals Co., Ltd. Water absorbent resin particles, absorbent, absorbent article and liquid suction power measurement method
CN113543877A (zh) * 2019-03-08 2021-10-22 住友精化株式会社 吸水性树脂颗粒、吸收体、吸收性物品、吸水性树脂颗粒的通液维持率的测定方法及吸水性树脂颗粒的制造方法
EP3954728A4 (fr) * 2019-04-23 2022-12-28 Sumitomo Seika Chemicals Co., Ltd. Particules de resine absorbante
WO2023189679A1 (fr) * 2022-03-29 2023-10-05 住友精化株式会社 Particules de résine absorbant l'eau
WO2024072076A1 (fr) 2022-09-28 2024-04-04 주식회사 엘지화학 Polymère superabsorbant

Also Published As

Publication number Publication date
JP2016121297A (ja) 2016-07-07

Similar Documents

Publication Publication Date Title
WO2016104374A1 (fr) Composition de résine absorbant l'eau
KR102567287B1 (ko) 흡수성 수지 입자
US10265226B2 (en) Water-absorbent resin, water-absorbent material, and water-absorbent article
JP5893117B2 (ja) 吸水性樹脂及び吸収性物品
JP5766344B1 (ja) 吸水性樹脂及び吸収性物品
TWI618719B (zh) Water-absorbent resin and method for producing water-absorbent resin
US10525443B2 (en) Water-absorbent resin and absorbent article
JP7194101B2 (ja) 吸水性樹脂
WO2016006135A1 (fr) Procédé de production d'une résine absorbant l'eau
EP3896096A1 (fr) Particules de résine absorbante
JP7021300B2 (ja) 吸収体及び吸収性物品
JP6828222B1 (ja) 吸水性樹脂粒子、吸収性物品、吸水性樹脂粒子を製造する方法、及び吸収体の加圧下での吸収量を高める方法
WO2021039715A1 (fr) Feuille absorbant l'eau et article absorbant
US20220219140A1 (en) Water-absorbent resin particles
WO2020122215A1 (fr) Particules de resine absorbant l'eau ainsi que produit absorbant l'eau et procede de fabrication de celui-ci
JP7091556B2 (ja) 吸水性樹脂粒子、及び吸水シート
JP6889811B2 (ja) 吸水性樹脂粒子、吸収性物品、吸水性樹脂粒子を製造する方法、及び吸収性物品の液漏れを抑制する方法
JP6752320B2 (ja) 吸収性物品及びその製造方法
JP6780048B2 (ja) 吸水性樹脂粒子、吸収体及び吸収性物品
WO2022210678A1 (fr) Résine absorbant l'eau, corps absorbant et article absorbant
JP2024059766A (ja) 吸水性樹脂
KR20240089203A (ko) 흡수성 수지 조성물, 흡수체 및 흡수성 물품
WO2020122203A1 (fr) Particules de résine absorbante, procédé d'évaluation de propriétés de fuite de liquide de ces particules, procédé de fabrication de ces particules, et article absorbant
JP2016027845A (ja) 吸水性樹脂及び吸収性物品

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: 15872942

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15872942

Country of ref document: EP

Kind code of ref document: A1