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WO2011007742A1 - Corps absorbant et article absorbant - Google Patents

Corps absorbant et article absorbant Download PDF

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Publication number
WO2011007742A1
WO2011007742A1 PCT/JP2010/061741 JP2010061741W WO2011007742A1 WO 2011007742 A1 WO2011007742 A1 WO 2011007742A1 JP 2010061741 W JP2010061741 W JP 2010061741W WO 2011007742 A1 WO2011007742 A1 WO 2011007742A1
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WO
WIPO (PCT)
Prior art keywords
containing layer
polyvalent metal
agent
absorbent
absorber
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/JP2010/061741
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English (en)
Japanese (ja)
Inventor
正樹 吉田
聡 水谷
孝義 小西
将志 中下
宏子 野積
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Unicharm Corp
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Unicharm Corp
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Filing date
Publication date
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Publication of WO2011007742A1 publication Critical patent/WO2011007742A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
    • 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
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
    • B01J2220/68—Superabsorbents

Definitions

  • the present invention is an absorber including a gelling agent-containing layer and an endothermic agent-containing layer, wherein the gelling agent-containing layer is present on the surface side of the endothermic agent-containing layer, and the absorption
  • the present invention relates to an absorbent article including a body.
  • Absorbents and absorbent articles containing the same are used for treating liquids such as body fluids and excreta in disposable diapers, sanitary products, medical blood absorbing articles, pet breeding products, etc. Water absorption performance is required. Absorbers and absorbent articles containing them are required to be lighter and thinner, and in consideration of the environment and hygiene, reduce the amount of incineration after use or dispose of them in flush toilets. Water decomposability, biodegradability, etc. that are possible are studied.
  • an acrylic acid-based absorbent that can absorb water several tens to several thousand times its own weight is known and used in a plurality of products.
  • absorbent bodies in which particles of a superabsorbent polymer composed of a polyacrylate cross-linked body are dispersed in pulp fibers are used in fields such as disposable diapers, sanitary products, medical blood absorbing articles, pet breeding products, etc. Widely used.
  • the acrylic acid-based absorbent is known to generate heat when moisture is taken in.
  • FIG. As shown in Comparative Example 2, the diaper temperature rises by about 2 ° C. over about 20 minutes. At that time, the relative humidity in the diaper reaches almost 100%.
  • This change in temperature and humidity is considered to be a great stress for babies who have not yet developed the autonomic nerve and have immature temperature regulation.
  • the baby feels discomfort due to stuffiness and easily loses the homeostasis balance of the skin, which is likely to induce diaper rash and the like. Therefore, from the viewpoint of improving the diaper environment, there is a need for a new absorbent material that replaces the acrylic acid absorbent material.
  • the above-mentioned acrylic acid-based absorbent material absorbs, retains and / or fixes a liquid such as body fluid or excrement after reaching the position where the absorbent material exists, and all the liquids are absorbent. It takes time to reach the position, and liquid leakage may occur before the liquid is fixed.
  • the acrylic acid-based absorbent material needs to be used in a relatively large amount in order to obtain satisfactory absorption performance, and has a problem that it is difficult to reduce the weight of the product.
  • the acrylic acid-based absorbent material has a characteristic that after absorbing the liquid, the particles of the absorbent material greatly increase the volume while taking in the surrounding air, the thickness tends to increase after absorption, “Discomfort during wearing” and / or “decrease in absorption performance” may occur.
  • the said acrylic acid type absorber has the very high absorption rate with respect to ion-exchange water, there exists a tendency for the absorption rate with respect to ion-containing liquids, such as a body fluid, to fall large. In order to improve the absorption performance, attempts have been made to lower the degree of crosslinking of the acrylic acid-based absorbent, but there are problems such as a decrease in gel strength.
  • the absorbent article is required to have water decomposability and / or biodegradability.
  • the acrylic acid-based absorbent is at a level that satisfies both water decomposability and biodegradability. There is a need for new absorbents.
  • Patent Document 1 contains a polysaccharide that can thicken in the presence of a polyvalent metal ion, and the polysaccharide is present in a state where it can be dissolved or dissociated in water in body fluids or excreta. A body fluid or excrement thickened article has been proposed.
  • the inventors of the present invention are absorbent bodies including a gelling agent-containing layer and an endothermic agent-containing layer, and the gelling agent in the gelling agent-containing layer Includes a polysaccharide capable of thickening in the presence of a polyvalent metal ion and a substance capable of supplying the polyvalent metal ion, and the gelling agent-containing layer is present on the surface side of the endothermic agent-containing layer.
  • the present inventors have found that the above-described problems can be solved by an absorbent body characterized by the above, and have completed the present invention.
  • An absorber including a gelling agent-containing layer and an endothermic agent-containing layer
  • the gelling agent in the gelling agent-containing layer includes a polysaccharide capable of thickening in the presence of a polyvalent metal ion and a substance capable of supplying the polyvalent metal ion, and the gelling agent-containing layer includes the endotherm. It is present on the surface side of the agent-containing layer, The absorber.
  • Embodiment 1 or wherein the substance capable of supplying the polyvalent metal ion is selected from the group consisting of calcium phosphate, calcium chloride, calcium lactate, calcium gluconate, calcium acetate, aluminum sulfate, aluminum nitrate, aluminum phosphate and aluminum acetate 2.
  • An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and the absorbent body according to any one of embodiments 1 to 12 disposed between the two sheets.
  • the gelling agent-containing layer does not easily raise the temperature of the liquid and the surrounding environment when the liquid such as urine is absorbed, so that it is not easily fogged when worn. Since the absorber of the present invention actively lowers the temperature of the liquid and the surrounding environment when the endothermic agent-containing layer absorbs liquid such as urine, it is difficult to cause fog when worn.
  • the absorbent according to the present invention is a polysaccharide that can thicken in the presence of polyvalent metal ions, after the large amount of liquid has been absorbed, the polysaccharide is thickened, and the liquid absorption rate and retention rate per unit mass of polysaccharide. And the amount of the gelling agent can be reduced, so that the absorber and the absorbent article can be reduced in weight and / or thinned.
  • FIG. 1 is a cross-sectional view of an absorbent body composed of a surface sheet, a gelling agent-containing layer, an endothermic agent-containing layer, and a back sheet in order from the surface side.
  • FIG. 2 is a cross-sectional view of an absorbent body composed of a surface sheet, a gelling agent-containing layer, a pulverized pulp fiber layer, an endothermic agent-containing layer, and a back sheet in order from the surface side.
  • FIG. 3 is a cross-sectional view of an absorbent body composed of a surface sheet, a gelling agent-containing layer, a heat-absorbing agent-containing layer, a superabsorbent polymer-containing layer, and a back sheet in order from the surface side.
  • FIG. 1 is a cross-sectional view of an absorbent body composed of a surface sheet, a gelling agent-containing layer, an endothermic agent-containing layer, and a back sheet in order from the surface side.
  • FIG. 2 is a cross-sectional
  • FIG. 4 is a cross-sectional view of an absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, and the absorbent body illustrated in FIG. 1 disposed between the two sheets.
  • FIG. 5 is a plan view of the endothermic agent-containing layer showing variations in the arrangement of the endothermic agent.
  • FIG. 6 is a graph showing the temperature change after artificial urine is put into the absorber.
  • FIG. 7 is a graph showing a temperature change after artificial urine is put into the absorber.
  • ⁇ absorber [Polysaccharides that can thicken in the presence of polyvalent metal ions]
  • polysaccharide means a saccharide in which a plurality of monosaccharides are bonded.
  • polysaccharide capable of thickening in the presence of a polyvalent metal ion means a polysaccharide that forms a cross-linked structure in the presence of a polyvalent metal ion described later and thickens the system.
  • sodium alginate, propylene glycol alginate, pectin, gellan gum, carrageenan, glucomannan and guar gum Particularly preferred is sodium alginate from the viewpoint of availability.
  • Sodium alginate is a polysaccharide made from seaweed and is the main component of seaweed dietary fiber. It dissolves in water and thickens, but can react with polyvalent metal ions to form a gel.
  • Sodium alginate has a linear polysaccharide composed of two types of uronic acids, ⁇ - (1 ⁇ 4) -D-mannuronic acid (M form) and ⁇ - (1 ⁇ 4) -L-gluconic acid (G form). In this case, there are an M-form consisting only of MM bonds, a G-form consisting only of GG bonds, and a random form in which M and G are randomly arranged. .
  • sodium alginate Since sodium alginate is derived from natural products, it has biodegradability and biosafety, and has properties such as liquid flow restraint, adhesiveness, and low friction. It is used in a wide range of applications such as pharmaceuticals, cosmetics, and wound dressings.
  • Sodium alginate is commercially available in a plurality of grades having different viscosities when dissolved, but any viscosity grade can be used for the absorber of the present invention.
  • a high-viscosity type is desirable, and a 1% by weight aqueous solution having a viscosity of 100 mPa ⁇ s or higher, preferably 500 mPa ⁇ s or higher is preferable.
  • the amount of polysaccharide that can thicken in the presence of the polyvalent metal ion is, for example, the type and molecular weight of the polysaccharide, the type and valence of the substance capable of supplying the polyvalent metal ion, and the use of the absorber. Although it varies depending on the amount of liquid to be absorbed, the basis weight is generally 10 to 1,000 g / m 2 . When sodium alginate is used as a polysaccharide that can thicken in the presence of the polyvalent metal ion, the amount is, for example, 20 to 150 g / m 2 as basis weight.
  • Examples of the form of the polysaccharide contained in the absorbent body of the present invention include powders, fiber-like structures, films, foams, and composites immobilized on a substrate.
  • the said polysaccharide of 1 type, or 2 or more types can be used for an absorber.
  • two or more forms can be used in combination to adjust the sol-formation and / or gelation timing of the polysaccharide.
  • a commercially available granular material can be used as the powder.
  • the commercially available granule is treated by granulation using an organic solvent or a plasticizer, coating with a surfactant, etc.
  • the organic solvent used for the granulation include lower alcohols such as methyl alcohol, ethyl alcohol, and propyl alcohol
  • the plasticizer that can be used for granulation include glycerin.
  • granulation can be performed simply by mixing the powder with the organic solvent or plasticizer, dispersing and then drying. Since the powder has a high affinity for a liquid such as a body fluid, an undissolved part is likely to occur when the aggregate is used as it is. Therefore, granulation that can increase the particle size to prevent agglomeration and further increase the surface area is useful.
  • the fiber-like structure examples include those produced by an arbitrary manufacturing method, for example, those that are spun and dried to be fiber-like.
  • the film include a film formed and dried to form a sheet.
  • the film generally has a smooth and uniform thickness, but can have an unevenness or a three-dimensional structure by embossing or the like. Moreover, it may have discontinuous pattern cuts such as various shapes of apertures and staggered patterns, and can be crushed flakes.
  • the film can be a single layer or multiple layers, and the dissolution rate or dissolution amount can be changed for each layer.
  • foam those produced by an arbitrary production method can be used.
  • foam is encapsulated in a polysaccharide solution using a foaming agent and / or a gas and a foam stabilizer, and a film is formed. , Dried and foamed.
  • the foaming rate of the foam is not particularly limited, and for example, a foamed foam of several to several tens of times can be used.
  • the complex examples include a complex of the polysaccharide and the base material, for example, the polysaccharide immobilized on the base material.
  • a binder can be used. In the case of using a binder, it is preferable to use a binder that does not inhibit the dissolution of the polysaccharide when it comes into contact with a liquid such as a body fluid.
  • the binder include starch, carboxymethyl cellulose, polyvinyl alcohol, and other water-soluble polymers that act as a water-soluble adhesive.
  • the base material for the complex is not particularly limited as long as it can hold the polysaccharide, and any base material can be used.
  • the substrate include films, sheets, and pores, cuts or tears, or fabrics such as woven fabrics, nonwoven fabrics, knitted fabrics, and nets, and contact with liquids such as body fluids. Sometimes preferred are those which do not inhibit the dissolution of the polysaccharide.
  • the “substance capable of supplying polyvalent metal ions” contained in the absorber of the present invention means a water-soluble substance capable of releasing bivalent or higher metal ions, for example, a salt containing bivalent or higher metal ions. To do.
  • the polyvalent ions crosslink and gel the polysaccharide that can thicken in the presence of the polyvalent metal ions.
  • Examples of the divalent or higher ions include calcium ions and aluminum ions.
  • Examples of the substance capable of supplying the polyvalent metal ion include a water-soluble calcium salt or a calcium salt that exhibits water solubility in the presence of an organic acid, such as calcium phosphate, for example, primary calcium phosphate, secondary calcium phosphate, secondary calcium phosphate. Dihydrate and tricalcium phosphate, calcium chloride, calcium lactate, calcium gluconate and calcium acetate, and water-soluble aluminum salts or aluminum salts that exhibit water solubility in the presence of organic acids, such as aluminum sulfate, aluminum nitrate, phosphorus Examples include aluminum acid and aluminum acetate.
  • an organic acid such as calcium phosphate, for example, primary calcium phosphate, secondary calcium phosphate, secondary calcium phosphate.
  • Dihydrate and tricalcium phosphate, calcium chloride, calcium lactate, calcium gluconate and calcium acetate and water-soluble aluminum salts or aluminum salts that exhibit water solubility in the presence of organic acids, such as aluminum sulfate, aluminum nitrate,
  • the mechanism by which the substance capable of supplying the polyvalent metal ion gels the polysaccharide that can thicken in the presence of the polyvalent metal ion is as follows. (1) Each component of the gelling agent begins to dissolve in the liquid that has permeated the absorber. (2) By dissolving polysaccharides that can thicken in the presence of polyvalent metal ions, the viscosity of the liquid is increased and fluidity is suppressed, and (3) from substances capable of supplying polyvalent metal ions The polyvalent metal ions are released, and the released polyvalent metal ions gel the polysaccharide.
  • the amount of the substance capable of supplying the polyvalent metal ion varies depending on, for example, the kind and valence of the substance, the kind and molecular weight of the polysaccharide, the use of the absorber, and the kind and amount of the liquid to be absorbed.
  • the basis weight is 20 to 150 g / m 2 , preferably 50 to 100 g / m 2 .
  • anhydrous sodium phosphate is used as the substance capable of supplying the polyvalent metal ion, the amount is, for example, 20 to 150 g / m 2 as basis weight.
  • complex fixed to powder or a base material is mentioned, for example.
  • the powder a commercially available granular material can be used as it is. However, for example, when the particle size of a commercially available granular material is small, in order to prevent agglomeration, as described in the above-mentioned section “Polysaccharides that can be thickened in the presence of polyvalent metal ions”, the powder Can be processed.
  • gelatinization can be accelerated
  • the polyvalent metal ions can be supplied also by using a method of coating a substance capable of supplying the polyvalent metal ions with a surfactant, gelatin, wafer, or the like, or a method of coating with a microcapsule or the like. The dissolution of the substance can be controlled and the timing of gelation can be controlled.
  • the complex examples include a complex of a substance capable of supplying the polyvalent metal ion and a substrate, for example, a substance in which a substance capable of supplying the polyvalent metal ion is immobilized on the substrate.
  • a binder can be used. When a binder is used, it is preferable that the binder does not inhibit dissolution of a substance capable of supplying a polyvalent metal ion when contacting with a liquid such as a body fluid.
  • the binder include starch, carboxymethyl cellulose, polyvinyl alcohol, and other water-soluble polymers that act as a water-soluble adhesive.
  • the substrate is not particularly limited as long as it can hold a substance capable of supplying the polyvalent metal ion, and any substrate can be used.
  • the substrate include fabrics such as woven fabrics, non-woven fabrics, films and sheets, and those described in the above-mentioned section “Polysaccharides capable of thickening in the presence of polyvalent metal ions”. The same can be used.
  • the gelling agent in the absorber of the present invention can further contain an organic acid and / or a polyvalent metal ion scavenger, if desired.
  • Organic acid In the present invention, the organic acid is an optional component of the gelling agent.
  • organic acid means an organic compound that can lower the pH of the system. Examples of the organic acid used in the absorber of the present invention include glucono- ⁇ -lactone, adipic acid, citric acid, malic acid, tartaric acid, lactic acid and acetic acid. The organic acids may be used alone or in combination.
  • the mechanism by which the organic acid promotes gelation of polysaccharides that can thicken in the presence of polyvalent metal ions is as follows. (1) Each component in the gelling agent begins to dissolve in the liquid that has permeated the absorber. (2) By dissolving the polysaccharide that can thicken in the presence of polyvalent metal ions, the viscosity of the liquid is increased and the fluidity is suppressed. (3) The organic acid dissolves to lower the pH of the liquid. In particular, when glucono- ⁇ -lactone is used as the organic acid, an equilibrium reaction with gluconic acid occurs, and the pH of the solution is gradually decreased. (4) By reducing the pH, the polyvalent metal ions are easily released from the substance capable of supplying the polyvalent metal ions, and the released polyvalent metal ions cause the polysaccharide to gel. The gelation of the liquid is promoted.
  • the amount of the organic acid is not particularly limited.
  • the polysaccharide can be thickened in the presence of the polyvalent metal ion used, the substance capable of supplying the polyvalent metal ion, and the polyvalent metal ion scavenger.
  • it is an amount that lowers the pH of the system, adjusts the dissolution rate of a substance capable of supplying a polyvalent metal ion, and promotes gelation, for example, The amount is 25 to 200% by mass based on the amount of the substance capable of supplying the polyvalent metal ion.
  • the amount is, for example, 20 to 150 g / m 2 as basis weight.
  • the organic acid contained in the absorbent body of the present invention for example, a powder or a complex immobilized on a substrate can be mentioned.
  • a powder a commercially available granular material can be used as it is.
  • the particle size of a commercially available granular material is small, in order to prevent agglomeration, as described in the above-mentioned section “Polysaccharides that can be thickened in the presence of polyvalent metal ions”, the powder Can be processed.
  • the complex examples include a complex of the organic acid and the base material, for example, the organic acid immobilized on the base material.
  • a binder can be used.
  • a material that does not inhibit the dissolution of the organic acid when a liquid such as a body fluid is contacted is preferable.
  • the binder include starch, carboxymethyl cellulose, polyvinyl alcohol, and other water-soluble polymers that act as a water-soluble adhesive.
  • the substrate is not particularly limited as long as it can hold the organic acid, and any substrate can be used.
  • the substrate include fabrics such as woven fabrics, non-woven fabrics, films and sheets, and those described in the above-mentioned section “Polysaccharides capable of thickening in the presence of polyvalent metal ions”. The same can be used.
  • the polyvalent metal ion scavenger is an optional component of the gelling agent.
  • the “polyvalent metal ion scavenger” means, for example, a compound capable of supplying the polyvalent metal ion, or a compound that captures a polyvalent metal ion derived from a liquid such as a body fluid, such as a polyvalent metal. A compound that forms a complex with an ion.
  • the polyvalent metal ion scavenger used in the absorber of the present invention include carboxylates such as sodium citrate and phosphates such as sodium polyphosphate, sodium hexametaphosphate and sodium pyrophosphate.
  • the mechanism by which the polyvalent metal ion scavenger suppresses the gelation of polysaccharides that can thicken in the presence of polyvalent metal ions is as follows. (1) Each component of the gelling agent begins to dissolve in the liquid that has permeated the absorber. (2) When the polysaccharide that can thicken in the presence of polyvalent metal ions is dissolved, the viscosity of the liquid is increased, and the fluidity is suppressed (thickened).
  • the dissolved polyvalent metal ion scavenger captures the polyvalent metal ion released from the substance capable of supplying the polyvalent metal ion (for example, forms a complex with the polyvalent metal ion), and (4 ) By capturing the polyvalent metal ions, the polyvalent metal ion concentration in the solution does not increase, and gelation is suppressed.
  • the amount of the polyvalent metal ion scavenger is not particularly limited, and can be thickened in the presence of the polyvalent metal ion used, a substance capable of supplying the polyvalent metal ion, and the type of organic acid
  • the amount is 0.1 to 1% by mass based on the amount of the substance capable of supplying the polyvalent metal ion.
  • the polyvalent metal ion scavenger contained in the absorber of the present invention for example, a powder or a complex immobilized on a substrate can be mentioned.
  • a powder or a complex immobilized on a substrate can be mentioned.
  • the powder a commercially available granular material can be used as it is.
  • the particle size of a commercially available granular material is small, in order to prevent agglomeration, as described in the above-mentioned section “Polysaccharides that can be thickened in the presence of polyvalent metal ions”, the powder Can be processed.
  • the complex examples include a complex of the polyvalent metal ion scavenger and a substrate, for example, a complex in which the polyvalent metal ion scavenger is immobilized on a substrate.
  • a binder can be used. When a binder is used, it is preferable that the binder does not inhibit dissolution of the polyvalent metal ion scavenger when contacting with a liquid such as a body fluid.
  • the binder include starch, carboxymethyl cellulose, polyvinyl alcohol, and other water-soluble polymers that act as a water-soluble adhesive.
  • the substrate is not particularly limited as long as it can hold the polyvalent metal ion scavenger, and any substrate can be used.
  • the substrate include fabrics such as woven fabrics, non-woven fabrics, films and sheets, and those described in the above-mentioned section “Polysaccharides capable of thickening in the presence of polyvalent metal ions”. The same can be used.
  • the rate of gelation becomes slow, and the liquid absorption rate per unit mass of the polysaccharide that can thicken in the presence of the polyvalent metal ion increases.
  • the structure of the absorber can be simplified.
  • the “gelling agent” includes a polysaccharide capable of thickening in the presence of a polyvalent metal ion, a substance capable of supplying the polyvalent metal ion, an organic acid and a polyvalent metal ion scavenger as required.
  • a "gelling agent content layer” means the layer containing the above-mentioned gelling agent.
  • each component of the gelling agent that is, a polysaccharide capable of thickening in the presence of a polyvalent metal ion, a substance capable of supplying the polyvalent metal ion, and as desired
  • the organic acid and the polyvalent metal ion scavenger can be separately introduced into the layer.
  • the individual components can each be introduced in the form described above.
  • a polysaccharide capable of thickening in the presence of a polyvalent metal ion, a substance capable of supplying the polyvalent metal ion, an organic acid and a polyvalent metal ion as desired A gelling agent can be prepared by mixing with a scavenger and then introduced into the layer.
  • examples of the form of the gelling agent to be introduced include powders, fiber-like structures, films, foams, and composites immobilized on a substrate.
  • the powder, fiber-like structure, film, foam, and composite immobilized on the substrate are those described in the above-mentioned section “Polysaccharides that can be thickened in the presence of polyvalent metal ions”. Can be the same form.
  • the gelling agent-containing layer used in the present invention has less volume swelling when absorbing the liquid and less deformation of the absorbent article after absorption, compared with the layer of acrylic acid absorbent material. The reduction can be suppressed, and the uncomfortable feeling during wearing can be reduced.
  • the gelling agent-containing layer used in the present invention has less volume swelling when absorbing the liquid and less increase in the thickness of the absorbent article after absorption compared to the layer of acrylic acid absorbent material. It is possible to suppress a decrease in absorption performance and to reduce the uncomfortable feeling during wearing.
  • the gelling agent-containing layer used in the present invention hardly takes in air during dissolution and gelation, the volume increase rate when a unit volume of liquid is absorbed is small and hardly deformed.
  • the “endothermic agent” means a substance that absorbs heat when dissolved in water.
  • Substances that absorb heat when dissolved in water include not only substances whose dissolution in water itself is an endothermic reaction (that is, substances having a negative heat of dissolution) but also substances that dissolve in water and cause an endothermic reaction, for example,
  • a combination of an acid and a base, in which the reaction when neutralizing by dissolving in water is endothermic is also included.
  • the “endothermic agent-containing layer” means a layer containing the above-mentioned endothermic agent.
  • Examples of the substance having a negative heat of solution include saccharides such as glucose, sugar alcohols such as erythritol, xylitol, mannitol, maltitol, sorbitol, amino acids such as glycine, urea, salts such as sodium sulfate Hydrates, ammonium nitrate, sodium thiosulfate pentahydrate, aluminum potassium sulfate, sodium acetate monohydrate, sodium carbonate decahydrate, sodium bicarbonate, potassium chloride, sulfur-containing amines such as taurine . These can be used alone or in combination.
  • the amount of the endothermic agent is not particularly limited as long as the temperature change of the absorbent article when absorbing the liquid can be suppressed within approximately ⁇ 1.5 ° C., and the gelation used
  • the basis weight is 20 to 150 g / m 2 although it varies depending on the type and amount of the agent.
  • Examples of the combination of an acid and a base in which the neutralization reaction is endothermic include a combination of a carboxylic acid such as citric acid and sodium hydrogen carbonate.
  • a carboxylic acid such as citric acid and sodium hydrogen carbonate.
  • 20 to 250 g of citric acid is used as an amount that can suppress the temperature change of the absorbent article when liquid is absorbed within approximately ⁇ 1.5 ° C. / M 2 and sodium bicarbonate 20 to 250 g / m 2 are preferable.
  • the molar ratio of citric acid and sodium hydrogen carbonate is close.
  • the endothermic agent a combination of citric acid and sodium bicarbonate and xylitol are preferable in consideration of the possibility of touching the human skin.
  • the form of the endothermic agent include a powder or a composite immobilized on a base material.
  • a powder a commercially available granular material can be used as it is.
  • the particle size of a commercially available granular material is small, in order to prevent agglomeration, as described in the above-mentioned section “Polysaccharides that can be thickened in the presence of polyvalent metal ions”, the powder Can be processed.
  • the composite examples include a composite of the endothermic agent and the base material, for example, one in which the endothermic agent is fixed to the base material.
  • a binder can be used.
  • the binder include starch, carboxymethyl cellulose, polyvinyl alcohol, and other water-soluble polymers that act as a water-soluble adhesive.
  • absorber refers to sanitary products such as sanitary napkins and panty liners, sanitary products such as disposable diapers, urine leakage prevention sheets, urine absorbing pads for incontinence patients, and fluid and blood absorption. Medical supplies, wound supplies, cosmetic pack materials, animal excretion treatment agents, agricultural and horticultural supplies, freshness-preserving materials in food fields, anti-condensation materials, and items used in places where water absorption and / or water retention is required It means an object mainly used for absorbing liquids.
  • the absorber of the present invention can include a surface sheet, a gelling agent-containing layer, a heat-absorbing agent-containing layer, and a back sheet in order from the surface side. Also, the absorbent body of the present invention can include additional layers and / or sheets, if desired.
  • the additional layer examples include a pulverized pulp fiber layer and a superabsorbent polymer-containing layer.
  • these additional layers are, for example, on the front side of the gelling agent-containing layer, between the gelling agent-containing layer and the endothermic agent-containing layer, and on the back side of the endothermic agent-containing layer. Can be arranged.
  • the “front side” means a side that comes into contact with the skin and absorbs liquid
  • the “back side” means a side that comes into contact with clothes.
  • Examples of the base material for each layer of the absorbent body of the present invention include fibers and nonwoven fabrics.
  • the substrate preferably has water decomposability and / or biodegradability.
  • Examples of the fibers inside the absorbent body of the present invention include synthetic fibers such as polyester fibers, polyacrylonitrile fibers, polyvinyl chloride fibers, polyethylene fibers, polypropylene fibers, polystyrene fibers, polyethylene terephthalate fibers, polyethylene / polypropylene fibers, polyethylene / Polyethylene terephthalate composite fiber, polyvinyl alcohol fiber, semi-synthetic fiber such as cellulosic fiber, protein fiber, natural fiber, regenerated fiber such as cellulosic fiber such as pulp fiber, rayon fiber, acetate fiber Etc.
  • the fibers may be either short fibers / long fibers, and fibers having an arbitrary diameter can be used.
  • the fiber can be, for example, a core-sheath type composite fiber, a parallel type composite fiber, an atypical hollow fiber, a microporous fiber, a bonded type composite fiber, or the like.
  • the fibers can be used at a basis weight of 20 to 250 g / m 2 .
  • nonwoven fabric used for the surface sheet of the absorbent body of the present invention for example, a thermal bond nonwoven fabric, a melt blown nonwoven fabric, a spunbond / meltblown / spunbond nonwoven fabric, a spunlace nonwoven fabric, an airlaid nonwoven fabric, a through-air nonwoven fabric (TA), a point bond ( A publicly known nonwoven fabric such as PB) can be used.
  • TA through-air nonwoven fabric
  • PB through-air nonwoven fabric
  • the tissue which can be hydrolyzed can be used as the said surface sheet.
  • dry or wet methods such as through air, a point bond, and a spun lace, can be mentioned, for example.
  • the non-woven fabric can have elasticity.
  • Examples of the stretchable nonwoven fabric include nonwoven fabrics manufactured by melt blown and spunbond manufacturing methods.
  • the stretchable nonwoven fabric can be produced from stretchable fibers obtained by melting and spinning a thermoplastic elastomer resin.
  • Examples of the back sheet of the absorbent body of the present invention include those manufactured from polyester, polyacrylonitrile, polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl alcohol, or the like.
  • a breathable film made of high-density polyethylene / low-density polyethylene, a non-breathable film, a perforated film and the like can be mentioned.
  • the absorber of the present invention may further contain various additives such as plasticizers, fragrances, deodorants, inorganic powders, pigments, dyes, antibacterial materials, and adhesives that are usually used in the art.
  • plasticizers include glycerin, lactitol, maltose, pentaerythose and the like. Trehalose can also be used to prevent cracking of the film or sheet during drying. With these additives, various functions can be imparted to the absorbent material.
  • the inorganic powder include substances that are inert to liquids, such as silicon dioxide, zeolite, kaolin, and clay.
  • the above-mentioned various additives are included in the gelling agent-containing layer and / or the endothermic agent-containing layer, and optionally the pulverized pulp fiber layer and the superabsorbent polymer-containing layer according to a method commonly used in the art. Can do.
  • the superabsorbent polymer examples include synthetic polymer-based absorbents such as starch-based, cellulose-based, polyacrylic acid-based, polyvinyl alcohol-based, polyacrylamide-based, and polyoxyethylene-based absorbents.
  • An acid-based absorbent is preferable, and among them, a sodium polyacrylate-based absorbent is preferable.
  • FIG. 1 to 3 are cross-sectional views of the absorbent body 1, and the upper side is the surface side.
  • FIG. 5 is the figure which looked at the endothermic agent content layer 7 from the surface side.
  • FIG. 1 is a cross-sectional view of an absorbent body 1 including a top sheet 4, a gelling agent-containing layer 6, a heat-absorbing agent-containing layer 7, and a back sheet 5 in order from the top.
  • FIG. 2 is a cross-sectional view of the absorbent body 1 including the top sheet 4, the gelling agent-containing layer 6, the pulverized pulp fiber layer 8, the endothermic agent-containing layer 7 and the back sheet 5 in order from the top.
  • the pulverized pulp fiber layer 8 between the gelling agent-containing layer 6 and the endothermic agent-containing layer 7, it is possible to prevent the gelling agent from moving to the lower layer during absorption of the liquid. It is possible to sufficiently gel the surface side and prevent the liquid absorbed from the surface side from leaking.
  • FIG. 3 is a cross-sectional view of the absorbent body 1 including the top sheet 4, the gelling agent-containing layer 6, the endothermic agent-containing layer 7, the superabsorbent polymer-containing layer 10, and the back sheet 5 in order from the top.
  • FIG. 5 is a plan view of the endothermic agent-containing layer 7 showing variations in the arrangement of the endothermic agent.
  • the endothermic agent is disposed on the entire endothermic agent-containing layer 7.
  • the absorbent is arranged in a lattice pattern
  • in FIG. 5 (c) is arranged in a stripe pattern
  • in FIG. 5 (d) is arranged in a mesh shape
  • in (e) it is arranged in the crotch region. Has been.
  • lattice may be the same, or the magnitude
  • the widths of the stripe streaks and the mesh may be the same, or the width may be wider as it is closer to the crotch portion.
  • the basis weight of the endothermic agent in the region 14 containing the endothermic agent may be constant, or the basis weight increases or decreases as it approaches the crotch portion. Can be arranged as follows.
  • the surface sheet and the back sheet are selected from materials having water decomposability, thereby imparting water decomposability to the absorber of the present invention. be able to. Furthermore, since the gelling agent and the endothermic agent used in the absorbent body of the present invention are biodegradable, the surface sheet and the back sheet are selected from materials having biodegradability, so that the absorbent body of the present invention is viable. Degradability can be imparted.
  • the “absorbent article” refers to sanitary products such as sanitary napkins and panty liners, sanitary products such as disposable diapers, urine leakage prevention sheets, urine picking pads for incontinence patients, body fluids and blood Absorbing medical supplies, wound supplies, cosmetic packaging materials, animal excrement treatment agents, agricultural and horticultural supplies, freshness-preserving materials in food fields, anti-condensation materials, and articles used in places where water absorption and / or water retention is required In particular, it means disposable diapers, urine leakage prevention sheets, and urine collection pads for incontinence patients.
  • liquid permeable top sheet means a sheet that is disposed on the surface side and that allows liquid, particularly body fluid, to pass therethrough.
  • the liquid-permeable top sheet used in the absorbent article of the present invention is not particularly limited as long as the liquid can permeate, for example, a hydrophilic fiber nonwoven fabric, a hydrophobic fiber nonwoven fabric having a plurality of apertures, Examples thereof include a plastic film having an aperture.
  • liquid-impermeable back sheet means a sheet disposed on the back surface side that does not allow liquid, particularly bodily fluid, to pass through under normal use conditions.
  • the liquid-impermeable back sheet used in the absorbent article of the present invention is not particularly limited as long as it is a sheet that does not transmit liquid, and can be any sheet used in the art, for example, Mention may be made of films and non-woven fabrics.
  • the structure of the absorbent article of the present invention is not particularly limited as long as the absorber can effectively absorb a liquid, particularly a bodily fluid or liquid excrement, and any structure used in the art.
  • the following modes can be exemplified.
  • An absorbent article including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets.
  • FIG. 4 is a cross-sectional view of the absorbent article 11, and the upper side is the surface side.
  • FIG. 4 is a cross-sectional view of the absorbent article 11 including the liquid-permeable top sheet 12 and the liquid-impermeable back sheet 13 and the absorbent body 1 shown in FIG. 1 disposed between the two sheets.
  • a part and% mean a mass part and mass%, respectively.
  • a tissue coated with a hot melt adhesive having a size of 150 ⁇ 200 mm (manufactured by Kokumi Paper Co., Ltd., basis weight: 17 g / m 2 ) is placed with the coated surface facing upward, and a lower layer member is placed thereon. 1 was arranged to have a basis weight of 266 g / m 2 . The upper layer member 1 was directly disposed on the lower layer member 1 so as to have a basis weight of 381 g / m 2 .
  • the absorbent body 1 was manufactured by pasting with an agent.
  • a tissue coated with a hot melt adhesive having a size of 150 ⁇ 200 mm (manufactured by Kokumi Paper Co., Ltd., basis weight: 17 g / m 2 ) is placed with the coated surface facing upward, and a lower layer member is placed thereon. 2 was arranged to have a basis weight of 216 g / m 2 .
  • a pulverized pulp fibers as the middle layer member 2, and arranged such that the basis weight of 100 g / m 2, the upper member 2 thereon, a basis weight of 331 g / m 2 Placed directly on.
  • the absorbent body 2 was manufactured by pasting with an agent.
  • the absorber 4 was manufactured according to the manufacture example 1 except having changed the member 1 for lower layers into the member 4 for lower layers (basis weight 650 g / m ⁇ 2 >).
  • -Upper layer member 5- Upper layer member 5 was manufactured by mixing 77 parts of sodium alginate, 77 parts of anhydrous sodium phosphate, 77 parts of glucono- ⁇ -lactone, and 100 parts of pulverized pulp fiber.
  • -Middle layer member 5- 100 parts of sodium hydrogen carbonate, 100 parts of citric acid, and 100 parts of pulverized pulp fiber were mixed to produce the middle layer member 5.
  • -Lower layer member 5- A lower layer member 5 was manufactured by mixing 230 parts of an acrylic acid-based absorbent (manufactured by Sundia Polymer Co., Ltd., UP270) and 100 parts of pulverized pulp fibers.
  • a tissue coated with a hot melt adhesive having a size of 150 ⁇ 200 mm (manufactured by Kokumi Paper Co., Ltd., basis weight: 17 g / m 2 ) is placed with the coated surface facing upward, and a lower layer member is placed thereon. 5 was arrange
  • the middle layer member 5 is directly disposed on the lower layer member 5 so as to have a basis weight of 300 g / m 2, and the upper layer member 5 is disposed on the middle layer member 5 with a basis weight of 331 g / m 2 . Directly arranged to be.
  • the absorbent body 5 was manufactured by pasting with an agent.
  • -Upper layer member 8- The upper layer member 8 was manufactured by mixing 77 parts of sodium alginate and 150 parts of pulverized pulp fibers.
  • -Lower layer member 8- The lower layer member 8 was manufactured by mixing 230 parts of an acrylic acid-based absorbent (manufactured by Sundia Polymer Co., Ltd., UP270) and 150 parts of pulverized pulp fibers.
  • absorber 8- A tissue coated with a hot melt adhesive having a size of 150 ⁇ 200 mm (manufactured by Kokumi Paper Co., Ltd., basis weight: 17 g / m 2 ) is placed with the coated surface facing upward, and a lower layer member is placed thereon. 8 was arrange
  • the absorbent body 8 was manufactured by pasting with an agent.
  • the cylinder was removed, and a sensor for temperature and humidity measurement (O & T TR-72U manufactured by T & D Co., Ltd.) was placed on the upper surface of the absorber, and further covered with a wrap film. The temperature was recorded at certain times (after 1 min, 3 min, 5 min, 10 min, 20 min, 30 min, 45 min and 60 min). In addition, the temperature of the artificial urine immediately before injection was substituted for the liquid temperature at 0 minute.
  • a sensor for temperature and humidity measurement O & T TR-72U manufactured by T & D Co., Ltd.
  • Table 1 shows the layer structure of the absorber used in Examples and Comparative Examples
  • FIG. 6 shows the results of Examples
  • FIG. 7 shows the results of Comparative Examples.
  • the absorbent bodies 1 to 5 of the present invention have almost the same temperature after urination compared to the absorbent body 8 (current acrylic acid absorbent) of Comparative Production Example 2. The temperature did not increase, and the temperature immediately returned to the general diaper temperature (32.5 ° C.). Absorbers 1 to 5 had a temperature in the range of 33.4 ° C. to ⁇ 1.5 ° C. of the initial diaper temperature at 3 to 10 minutes after the artificial urine was charged. From Example 5, it was found that even when an acrylic acid absorbent material was used in combination, the temperature in the diaper could be controlled by controlling the amount of the acrylic acid absorbent material and the layer structure.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Analytical Chemistry (AREA)
  • Epidemiology (AREA)
  • Medicinal Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

L'invention porte sur un corps absorbant de telle sorte que des changements de température durant l'urination sont rendus minimaux, et sur un article absorbant qui contient ledit corps absorbant. Le corps absorbant comprend une couche contenant un agent gélifiant, et une couche contenant un agent endothermique, et est caractérisé en ce que l'agent gélifiant dans la couche contenant l'agent gélifiant comprend des polysaccharides qui peuvent s'épaissir en présence d'ions métalliques polyvalents, et un matériau qui peut délivrer des ions métalliques polyvalents, et en ce que la couche contenant l'agent gélifiant est disposée plus proche de la surface que la couche contenant l'agent endothermique.
PCT/JP2010/061741 2009-07-13 2010-07-06 Corps absorbant et article absorbant Ceased WO2011007742A1 (fr)

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JP2009165025A JP5483940B2 (ja) 2009-07-13 2009-07-13 吸収体及び吸収性物品
JP2009-165025 2009-07-13

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WO2011108405A1 (fr) * 2010-03-05 2011-09-09 ユニ・チャーム株式会社 Agent absorbant contenant un composé polymère pouvant épaissir un fluide et agent de génération d'un gaz par mise en contact avec un fluide
US8993470B2 (en) 2010-04-03 2015-03-31 Studiengesellschaft Kohle Mbh Catalysts for the alkyne metathesis
US9233362B2 (en) 2011-02-28 2016-01-12 Studiengesellschaft Kohle Mbh Molybdenum and tungsten metal complexes and use thereof as precatalysts for olefin metathesis
US9919299B2 (en) 2013-03-14 2018-03-20 Ximo Ag Metathesis catalysts and reactions using the catalysts
US10071950B2 (en) 2013-07-12 2018-09-11 Ximo Ag Use of immobilized molybdenum- and tungsten-containing catalysts in olefin cross metathesis
US10427146B2 (en) 2013-10-01 2019-10-01 Ximo Ag Immobilized metathesis tungsten oxo alkylidene catalysts and use thereof in olefin metathesis
US10744494B2 (en) 2015-12-23 2020-08-18 Ximo Ag Immobilized metal alkylidene catalysts and use thereof in olefin metathesis

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KR101486224B1 (ko) 2013-03-19 2015-01-28 전남대학교산학협력단 일회용 기저귀에 활용 가능한 천연고분자를 함유하는 흡수성 수지 및 이의 제조방법
JP5421481B1 (ja) * 2013-03-22 2014-02-19 ユニ・チャーム株式会社 動物用排泄物処理材の製造方法およびその製造装置
JP6251558B2 (ja) * 2013-12-09 2017-12-20 花王株式会社 吸収性物品
US11311429B2 (en) 2019-01-31 2022-04-26 Kimberly-Clark Worldwide, Inc. Methods and products for dynamic control of environments by selective metabolic function of microbes
CN115776876A (zh) * 2020-06-30 2023-03-10 尤妮佳股份有限公司 吸收性物品
TWI857680B (zh) * 2023-06-29 2024-10-01 國立成功大學 模擬蛋白質特性的病灶組織假體的製造方法、病灶組織假體及醫學假體

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WO2011108405A1 (fr) * 2010-03-05 2011-09-09 ユニ・チャーム株式会社 Agent absorbant contenant un composé polymère pouvant épaissir un fluide et agent de génération d'un gaz par mise en contact avec un fluide
US8993470B2 (en) 2010-04-03 2015-03-31 Studiengesellschaft Kohle Mbh Catalysts for the alkyne metathesis
US9233362B2 (en) 2011-02-28 2016-01-12 Studiengesellschaft Kohle Mbh Molybdenum and tungsten metal complexes and use thereof as precatalysts for olefin metathesis
US9919299B2 (en) 2013-03-14 2018-03-20 Ximo Ag Metathesis catalysts and reactions using the catalysts
US10343153B2 (en) 2013-03-14 2019-07-09 Ximo Ag Metathesis catalysts and reactions using the catalysts
US10071950B2 (en) 2013-07-12 2018-09-11 Ximo Ag Use of immobilized molybdenum- and tungsten-containing catalysts in olefin cross metathesis
US10427146B2 (en) 2013-10-01 2019-10-01 Ximo Ag Immobilized metathesis tungsten oxo alkylidene catalysts and use thereof in olefin metathesis
US10744494B2 (en) 2015-12-23 2020-08-18 Ximo Ag Immobilized metal alkylidene catalysts and use thereof in olefin metathesis

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