WO2011070876A1 - 吸収体及び吸収性物品 - Google Patents
吸収体及び吸収性物品 Download PDFInfo
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- WO2011070876A1 WO2011070876A1 PCT/JP2010/069600 JP2010069600W WO2011070876A1 WO 2011070876 A1 WO2011070876 A1 WO 2011070876A1 JP 2010069600 W JP2010069600 W JP 2010069600W WO 2011070876 A1 WO2011070876 A1 WO 2011070876A1
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- Prior art keywords
- water
- absorbing polymer
- binder
- fiber
- sheet
- Prior art date
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- 238000005227 gel permeation chromatography Methods 0.000 description 1
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- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
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- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000012461 sponges Nutrition 0.000 description 1
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- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/530708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the absorbency properties
- A61F2013/530737—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the absorbency properties by the absorbent capacity
Definitions
- the present invention relates to an absorbent body and an absorbent article used for sanitary napkins and the like.
- Patent Document 1 As an absorbent body used for absorbent articles such as sanitary napkins and disposable diapers, one having a structure in which a water-absorbing polymer is sandwiched between two sheets is known.
- Patent Document 1 after applying a pressure-sensitive adhesive such as a hot-melt pressure-sensitive adhesive on a sheet-like absorbent material having an appropriate liquid absorption capacity in a dot-like, linear or curved shape at an appropriate density, there is described an absorbent sheet obtained by spraying a water-absorbing polymer on top and further compressing and integrating separate sheet-like absorbent materials.
- Patent Document 2 discloses an absorptivity obtained by spraying a water-absorbing polymer on a wet fiber web obtained by a wet papermaking method, superimposing a fiber assembly thereon, and drying and integrating them. A sheet is described.
- sanitary napkins that have been mainly used in Malay ethnic areas are composed of absorbent napkins made of cloth and pulp fibers that do not contain a water-absorbing polymer. The absorbed menstrual blood and the like can be washed away with water.
- a sanitary napkin is inferior in menstrual blood absorption and retention performance, and may cause so-called liquid return in which, for example, body fluid absorbed on the surface of the absorbent material oozes out. Therefore, in a conventional sanitary napkin that can be washed with water and does not contain a water-absorbing polymer, the use of a large amount of pulp fibers compensates for the lack of absorption performance. However, such sanitary napkins become thick due to the bulkiness of the pulp fibers, are particularly bulky when folded and packaged, are inconvenient to carry, and have a poor fit.
- the present invention also relates to an absorbent article including the absorber.
- the absorbent body and absorbent article of the present invention contain a water-absorbing polymer, the liquid return can be effectively suppressed, for example, the absorption performance is good, and the thickness can be designed to be thin. It is not bulky and can be excellent in portability and wearing feeling.
- FIG. 1 is a cross-sectional view schematically showing a cross section of an embodiment of the absorbent body of the present invention.
- FIG. 2 is a cross-sectional view schematically showing a cross section of another embodiment of the absorbent body of the present invention.
- FIG. 3 is a schematic view showing a manufacturing process of the absorbent body shown in FIG.
- FIG. 4 is a perspective view of a sanitary napkin that is an embodiment of the absorbent article of the present invention.
- FIG. 5 is a cross-sectional view schematically showing a cross section taken along line XX of FIG. 6 is a view corresponding to FIG. 5 of the sanitary napkin of Example 6.
- FIG. 1 is a cross-sectional view schematically showing a cross section of an embodiment of the absorbent body of the present invention.
- FIG. 2 is a cross-sectional view schematically showing a cross section of another embodiment of the absorbent body of the present invention.
- FIG. 3 is a schematic view showing a manufacturing process of the absorbent body
- the absorbent body of the present invention includes a water absorbent polymer having a centrifugal retention amount of 20 g / g or less and a fiber sheet in accordance with JIS K 7223, and the water absorbent polymer and the fiber sheet are anionic or nonionic. Are bonded to each other through a binder.
- the centrifugal retention amount according to JIS K 7223 of the water-absorbing polymer used in the present invention is preferably 5 to 20 g / g, more preferably 8 to 15 g / g. Even if the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less is reddish due to adhesion / absorption of menstrual blood or the like, it is possible to remove the reddish by subsequent washing with water. An easy absorber or absorbent article can be obtained.
- the water-absorbing polymer having a centrifugal retention amount exceeding 20 g / g has a strong redness caused by absorbed blood, and it is difficult to remove such redness by washing with water.
- the centrifugal retention amount is measured by the following measurement method.
- the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (Kokusan Co., Ltd., model H-130C special model).
- the dehydration condition is 143 G (800 rpm) for 10 minutes.
- the mass of the sample is measured, and the target centrifugal retention amount is calculated according to the following formula.
- Centrifugal retention amount (g / g) (abc) / c; where a is the total weight (g) of the sample and nylon bag after centrifugal dehydration, b is before water absorption of the nylon bag (during drying)
- the mass (g) and c of the sample represent the mass (g) of the sample before water absorption (during drying).
- a water-absorbing polymer having a centrifugal retention amount of 20 g / g or less according to JIS K 7223 can be obtained, for example, by performing an operation that moderately increases the degree of crosslinking of a conventional water-absorbing polymer. More specifically, for example, using a known polyacrylic acid-based water-absorbing polymer production method such as a reverse phase suspension polymerization method or an aqueous solution polymerization method described later, It is possible to obtain a water-absorbing polymer having a centrifugal retention of 20 g / g or less by obtaining a water-absorbing polymer (or hydrogel) having a carboxylate group and subjecting the water-absorbing polymer to a crosslinking treatment. it can.
- water-absorbing polymer material used in the present invention examples include the following polycarboxylic acids or salts thereof (lithium, sodium, potassium, cesium) subjected to crosslinking treatment.
- These 1 type can be used individually or in mixture of 2 or more types.
- a water-absorbing polymer having a centrifugal retention amount of 20 g / g or less in accordance with JIS K 7223 is obtained by polymerizing a monomer containing (1) (meth) acrylic acid and / or an alkali metal salt thereof (hydrous polymer in a water-containing state). Or a polymer obtained by crosslinking a polymer containing (meth) acrylic acid and / or an alkali metal salt thereof in the presence of a crosslinking agent. .
- the methods 1) and 2) can be performed using a known method for producing a polyacrylic acid-based water-absorbing polymer.
- this known production method for example, (i) a reverse phase suspension polymerization method using an anionic surfactant described in Japanese Patent No. 2721658 as a dispersant, and (ii) Japanese Patent Application Laid-Open No. 2003-235889 And the aqueous solution polymerization method described in 1.
- a polymer obtained by polymerizing a monomer containing (meth) acrylic acid and / or an alkali metal salt thereof in the presence of a crosslinking agent is further subjected to a crosslinking treatment with a crosslinking agent. You may do it.
- Examples of the copolymer of (meth) acrylic acid include acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, Copolymers obtained by copolymerizing co-monomers such as 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, or styrenesulfonic acid, starch-acrylic acid Examples thereof include a graft copolymer.
- the amount of the comonomer of the copolymer is preferably in a range that does not deteriorate blood absorption performance.
- sodium salts such as polyacrylic acid and polymethacrylic acid, are preferable.
- the compounds having two or more hydroxyl groups in the molecule include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, propylene glycol, diethanolamine, polyoxypropylene, sorbitan fatty acid ester, trimethylolpropane, pentaerythridine. Trit, 1,3-propanediol, sorbitol and the like can be mentioned.
- Examples of the compound having two or more polymerizable double bonds in the molecule include bis (meth) acrylamide, allyl (meth) acrylamide, di- or polyester of (meth) acrylic acid by polyol (for example, diethylene glycol diacrylate, trimethylol).
- polyol for example, diethylene glycol diacrylate, trimethylol.
- Propane triacrylate, polyethylene glycol diacrylate, etc. unsaturated mono-or polyols derived from the reaction of C 1 -C 10 polyhydric alcohols with 2 to 8 C 2 -C 4 alkylene oxides per hydroxyl group, or Examples thereof include polycarboxylic acid di- or polyester (for example, ethoxylated trimethylolpropane triacrylate and the like).
- polyglycidyl ethers such as propane polyglycidyl ether, sorbitol polyglycidyl ether, pentaerythritol polyglycidyl ether, resorcinol diglycidyl ether, neopentyl glycol diglycidyl ether, hydrogenated bisphenol A type diglycidyl ether.
- crosslinking agents a compound having two or more polymerizable double bonds and a compound having two or more epoxy groups in the molecule are preferable, and a compound having two or more epoxy groups in the molecule is more preferable.
- ethylene glycol diglycidyl ether and trimethylolpropane polyglycidyl ether are particularly preferable.
- a block shape such as a rectangular parallelepiped shape, a shape in which a plurality of spherical particles are combined, a shape in which a plurality of block particles are combined, a spherical shape
- the shape may be a combination of particles and block particles, a fiber shape, a plate shape, or the like.
- the particulate water-absorbing polymer includes an amorphous type, a block type, a bowl type, a spherical agglomeration type, a spherical type, and the like due to the difference in shape, and any type can be used in the present invention.
- the absorbent body of the present invention may contain a water-absorbing polymer other than the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less. From the viewpoint of more surely exerting the effect of the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less, the content of the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less is the absorption of the present invention. It is preferable that it is 80 mass% or more with respect to the total mass of all the water-absorbing polymers contained in the body, in particular 90 mass% or more, especially 100 mass%. All the water-absorbing polymers contained in the absorbent body of the present invention are ideal in terms of action and effect when the centrifugal retention amount is 20 g / g or less.
- mass means “mass at the time of drying” unless otherwise specified.
- the “mass at the time of drying” of the constituent member of the absorbent body or absorbent article is measured as follows. Measuring method of mass at the time of drying: The object to be measured is left for 24 hours in an environment of constant temperature and high humidity at a temperature of 23 ° C. and a humidity of 50%, then the mass is measured in the environment, and the measured value is measured. This is the “mass when dried” of the object.
- the distribution amount (spraying basis weight) of the water-absorbing polymer (all the water-absorbing polymers in the absorber including the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less) in the absorbent body of the present invention is preferably It is 10 to 200 g / m 2 , more preferably 20 to 150 g / m 2 , and even more preferably 30 to 120 g / m 2 .
- the fiber sheet constituting the absorbent body of the present invention a sheet-like material comprising fibers is used.
- the water-absorbing polymer having a centrifugal retention amount of 20 g / g or less is passed through a binder described later.
- those having an appropriate liquid absorption ability are preferable.
- the fiber sheet for example, paper, woven fabric, non-woven fabric, knitted fabric, parchment, papyrus, pulp piled fiber and the like can be used.
- the nonwoven fabric include a chemical bond nonwoven fabric, a thermal bond nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a needle punch nonwoven fabric, and a stitch bond nonwoven fabric.
- the fiber sheet may be a sheet having a single layer structure or a sheet having a multilayer structure.
- the basis weight of the fiber sheet is preferably 10 to 80 g / m 2 , more preferably 15 to 50 g / m 2 when the fiber sheet is paper, woven fabric, nonwoven fabric, or the like. in the case of ⁇ is preferably 50 ⁇ 1000g / m 2, more preferably 100 ⁇ 600g / m 2, more preferably 150 ⁇ 500g / m 2.
- the number of fiber sheets is not particularly limited, and the number of fiber sheets may be one.
- the fiber stack is preferably a single fiber sheet. That is, the absorbent body of the present invention may be one in which a water-absorbing polymer and one piece of pulp piled body are bonded to each other via a binder described later.
- the absorbent body of the present invention may be configured to include a water-absorbing polymer and a single fiber sheet, and the layer made of the water-absorbing polymer may be wrapped with the single fiber sheet.
- the one fiber sheet is preferably paper.
- the plurality of fiber sheets may have the same composition and / or dimensions, or may be different from each other.
- FIG. 1 schematically shows a cross section of an embodiment of the absorbent body of the present invention.
- the absorbent body 10 shown in FIG. 1 has a configuration in which a water-absorbing polymer 11 having a centrifugal retention amount of 20 g / g or less is sandwiched between two fiber sheets 12 and 13 having the same composition and / or dimensions.
- the water-absorbing polymer 11 and the fiber sheets 12 and 13 are bonded to each other through a binder (not shown) described later.
- the fiber sheets 12 and 13 for example, paper or a pulp pile is preferably used.
- the two fiber sheets 31 and 32 may be different from each other only in the dimension including the thickness, may be different only in the composition, or may be different in dimension and composition.
- an absorbent body using two fiber sheets one of which is a pulp-stacked fiber body and the other of which is a paper sheet, has a simple absorption process and a manufacturing process of the absorbent body. From this point, it is preferable.
- the paper is a fiber sheet that can be produced by a known wet papermaking method and has a thickness of 1 mm (basis weight 30 g / m 2 ) or less, and examples thereof include tissue paper.
- the pulp pile is a fiber aggregate obtained by fiber accumulation in air according to a known dry method, and has a thickness of 2 mm (basis weight 150 g / m 2 ) or more.
- an anionic or nonionic binder is used as an adhesive between the water-absorbing polymer and the fiber sheet, because of the disadvantage of using such a water-absorbing polymer having a low centrifugal retention amount (low tackiness). By avoiding that.
- anionic water-soluble binder used in the present invention examples include carboxymethylcellulose salt, poly (meth) acrylic acid, poly (meth) acrylate (including partially neutralized product), and acrylamide-acrylate (partially). Copolymers), maleic acid-acrylate salts (including partially neutralized products), polyamino acid salts (including partially neutralized products), and the like. Or 2 or more types can be mixed and used.
- the anionic water-soluble binder includes an anionic polymer obtained by polymerizing an acid group-containing unsaturated monomer, that is, an acid group-containing unsaturated monomer as a repeating unit.
- Adjustment of the neutralization degree of the anionic binder is, for example, water-soluble hydroxide such as lithium hydroxide, sodium hydroxide, potassium hydroxide, water glass, sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, etc.
- the water-soluble carbonate compound can be used.
- the degree of neutralization of the binder is measured as follows.
- the binder content in the absorbent body of the present invention is preferably 0.001 to 0.1% by mass, more preferably 0.002 to 0.08% by mass, and still more preferably 0.005 to 0.05% by mass. %.
- the method for incorporating the binder into the absorber is not particularly limited, and may be an internal addition method or an external addition method.
- the internal addition method include a method in which a binder is added in advance to the stock (fiber dispersion) when a fiber sheet is produced by a wet papermaking method.
- an external addition method for example, in the case of using two fiber sheets like the above-described absorbers 10 and 30, after forming each of the two fiber sheets, a water absorbent polymer is applied to one of the fiber sheets.
- spraying applying a binder to the spraying surface (surface on which the other sheet is superposed) by an application means such as spray, and superimposing the other fiber sheet thereon.
- a binder may be apply
- the absorbent body 10 (see FIG. 1) described above provides a water-soluble binder on the one surface (water-absorbing polymer-spreading surface) of the sheet on which the water-absorbing polymer 11 is sprinkled on one surface, and a separate body thereon. Those obtained by superimposing these sheets and integrating both sheets are preferred. A method for manufacturing the absorber 10 will be described later.
- a method in which a binder is attached to the surface of the water-absorbing polymer and the water-absorbing polymer to which the binder is attached is more effective for improving the peel strength of the absorber.
- the manufacturing method of such an absorber 30 will be described later.
- An absorbent body to be measured (absorber having a structure in which two sheets are overlapped) is taken out from the absorbent article, and 40 mm in the same direction as the longitudinal direction of the absorbent article is perpendicular to the longitudinal direction from the absorbent body.
- a rectangular shape of 30 mm or more is cut out in the same direction as the width direction, and this is used as a test piece, and two sheets constituting the absorber are peeled in an area extending about 1 cm from one end in the width direction of the test piece.
- the peeling of the paper and the measurement of the peeling strength are performed according to the above ⁇ Method for measuring peel strength>.
- the peel strength of each of the two sheets of paper is treated as a single measured value.
- the measurement is performed using only the other paper.
- hydrophilic fibers examples include natural cellulose fibers such as wood pulp such as softwood kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp and straw pulp; regenerated cellulose fibers such as rayon and cupra; polyvinyl alcohol fibers , Hydrophilic synthetic fibers such as polyacrylonitrile fibers; synthetic fibers such as polyethylene terephthalate (PET) fibers, polyethylene (PE) fibers, polypropylene (PP) fibers, and polyester fibers that have been hydrophilized with a surfactant. These 1 type can be used individually or in mixture of 2 or more types.
- natural cellulose fibers such as wood pulp such as softwood kraft pulp and hardwood kraft pulp, and non-wood pulp such as cotton pulp and straw pulp
- regenerated cellulose fibers such as rayon and cupra
- polyvinyl alcohol fibers Hydrophilic synthetic fibers such as polyacrylonitrile fibers
- synthetic fibers such as polyethylene terephthalate (PET) fibers, polyethylene (PE) fibers
- “bulky fiber” means that the fiber shape has a three-dimensional structure such as a twisted structure, a crimped structure, a bent and / or branched structure, or the fiber cross section is extremely thick (for example, the fiber roughness is high). 0.3 mg / m or more).
- the average fiber length of the bulky cellulose fiber is not particularly limited, but a general range is preferably 1 to 20 mm.
- the content of the bulky cellulose fiber is preferably 5% by mass or more, more preferably 10 to 65% by mass with respect to the total mass of the fiber sheet.
- Examples of preferable bulky cellulose fibers include cellulose fibers having a fiber roughness of 0.3 mg / m or more, particularly 0.3 to 2 mg / m, particularly 0.32 to 1 mg / m.
- Cellulose fibers having a fiber roughness of 0.3 mg / m or more are preferred because the cellulose fibers accumulate in a bulky state, so that a bulky network structure is easily formed in the sheet. Further, it is preferable because the liquid movement resistance is small and the liquid passage speed is high.
- the “fiber roughness” is used as a scale for representing the thickness of fibers having a non-uniform fiber thickness such as wood pulp.
- mercerized pulp having a roundness of 0.5 to 1 obtained by mercerizing wood pulp is also preferable.
- Examples of commercially available mercerized pulp that can be used in the present invention include “FILTRANIER” (trade name) manufactured by ITT Rayonier Inc., “POROSANIER” (trade name) manufactured by the same company, and the like.
- the amount of the crosslinking agent used is preferably 0.2 to 20 parts by mass with respect to 100 parts by mass of the cellulose fiber. If the amount used is less than 0.2 parts by mass, the crosslink density of the cellulose fibers is low, so the elastic modulus may be greatly reduced when wet. If the amount used exceeds 20 parts by mass, the cellulose fibers become rigid. Since the cellulose fiber may become brittle when excessively stressed, the above range is preferable.
- a cellulose fiber is impregnated into an aqueous solution of a cross-linking agent, if necessary, so that the aqueous solution of the cross-linking agent becomes a design adhesion amount.
- the cellulose fibers are dehydrated and then heated to a crosslinking temperature, or an aqueous solution of a crosslinking agent is sprayed on the cellulose fibers so as to have a designed adhesion amount by spraying or the like, and then heated to the crosslinking temperature to cause a crosslinking reaction.
- a bulky cellulose fiber in which the intramolecular and / or intermolecular molecules of the pulp having a roundness of the fiber cross section of 0.5 to 1 are cross-linked by the above-described method.
- bulky cellulose fibers in which the inside and / or between molecules of mercerized pulp having a fiber cross-section roundness of 0.5 to 1 is crosslinked by the above-mentioned method.
- Particularly preferred bulky cellulose fibers are those having a fiber roughness of 0.3 mg / m or more and mercerized to roundness of 0.5 to 1 and then crosslinked by the method described above.
- the fiber sheet 12 can be manufactured according to a manufacturing method of a sheet containing this type of fiber, and the manufacturing method is not particularly limited, and may be a wet method or a dry method.
- the fiber sheet 12 is manufactured by the wet papermaking method, a wet fiber sheet is always obtained, so that the labor of making the dry fiber sheet wet in a separate process can be saved.
- the fiber sheet 12 is manufactured by a wet papermaking method.
- the wet paper machine used in the wet paper machine include a short paper machine, a long paper machine, a twin wire paper machine, an on-top paper machine, a hybrid paper machine, and a round paper machine.
- the fibers forming the fiber sheets 12 and 13 and other components other than the binder are dispersed in water to a predetermined concentration to form a slurry.
- the slurry is introduced into a wet paper machine, and is made to flow and thinly flat on a wet paper machine according to a conventional method to form a wet fiber sheet 12.
- the binder 14 is applied to the spray surface of the water absorbent polymer 11.
- the binder is dissolved or dispersed in an appropriate solvent such as water to obtain a binder liquid, and this binder liquid is sprayed by spraying. It is preferable that the binder liquid is uniformly applied to the entire surface of the fiber sheet 12 on which the water-absorbing polymer 11 is spread on the one surface 12a.
- the amount of the binder (binder liquid) applied is appropriately determined in consideration of the amount of the water-absorbing polymer 11 applied, and is preferably 0.5 to 20 g / m 2 , more preferably 1 to 10 g / m 2 .
- the top sheet 21 covers the entire skin contact surface (upper surface) of the absorber 10, and the back sheet 22 covers the entire non-skin contact surface of the absorber 10. .
- End seals are applied to the top sheet 21 and the back sheet 22 at portions extending outward from the peripheral edge of the absorbent body 10, and end seal portions 26 are formed.
- An adhesive is applied on the non-skin contact surface of the back sheet 22 to form a fixing portion (not shown) for fixing the napkin 1 to shorts or the like.
- the top sheet 21 can be made of the same material as that conventionally known. For example, a hydrophilic nonwoven fabric or a perforated film is used.
- the back sheet 22 is composed of, for example, a liquid-impermeable film sheet, and the liquid-impermeable film sheet may have water vapor permeability.
- An end seal portion 26 is formed on the periphery of the napkin 20 at a position spaced outward from the absorber 10.
- the end seal portion 26 in the present embodiment is formed by integrating the top sheet 21 and the back sheet 22. More specifically, in the present embodiment, the top sheet 21 and the back sheet 22 extend from the peripheral edge portion of the absorbent body 10, and are joined to each other by a heat embossing process at the extended portions. Is formed.
- the end seal portion 26 has an effect of preventing the water absorbent material constituting the absorbent body 10 from flowing out when the napkin 1 is washed (when wet).
- the napkin 20 of the present embodiment is used by being attached to underwear in the same manner as a normal sanitary napkin of this type. Since the napkin 20 includes the absorbent body 10, the napkin 20 can be easily washed with water while having practically sufficient absorption performance, and the attached blood can be easily washed away with water. For this reason, it can be suitably used for people who have a habit of discarding the used napkin after washing with water. Further, the napkin 20 can be designed to have a small thickness, is not bulky, and can be excellent in portability and wearing feeling.
- 2,2′-azobis (2-amidinopropane) dihydrochloride manufactured by Wako Pure Chemical Industries, trade name V-50
- polyethylene glycol Kao, K-PEG6000 LA
- citric acid 4 g of an aqueous solution of ammonium iron (III) (manufactured by Kanto Kagaku) and 10 g of ion-exchanged water were mixed and dissolved to prepare an initiator (A) solution.
- 0.6 g of sodium persulfate (manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in 10 g of ion-exchanged water to prepare an initiator (B) solution.
- a titanium citrate aqueous solution (50% citric acid and titanyl sulfate aqueous solution were mixed at a mass ratio of 20/27) was prepared.
- initiator (A) solution is added to prepare monomer A.
- initiator (B) solution is added to prepare monomer B.
- initiator ( B) Monomer C was prepared by adding 5 g of the solution and 2 g of the aqueous titanium citrate solution.
- azeotropic dehydration is performed using a dehydration tube to adjust the water content of the water-absorbing polymer (hydrogel), and then ethylene glycol diglycidyl ether (manufactured by Nagase ChemteX, Sakai brand name Denacol EX-810) ) A solution of 0.25 g dissolved in 10 g of ion exchange water was added. Thereafter, azeotropic dehydration was further performed, and after cooling, cyclohexane was removed and dried to obtain a water-absorbing polymer.
- the monomer G is prepared by adding the initiator (A) solution used in the production of the water-absorbing polymer I to the monomer aqueous solution G, and the initiator (B) used in the production of the water-absorbing polymer I in the monomer aqueous solution H.
- Monomer H was prepared by adding the solution.
- Synthesis Example 6 (Production of water-absorbing polymer VI)]
- a polyacrylic acid sodium salt A (weight average molecular weight 250,000, carboxyl group neutralization degree 100 mol%) prepared by the following synthesis method 100 mass% of 5 mass% aqueous solution
- a water-absorbing polymer VI was obtained in the same manner as in Synthesis Example 5 except that the part was used.
- An adhesive is applied to the non-skin contact surface side of the obtained absorbent body (spreading surface side of the water-absorbing polymer in the fiber sheet 31), and the back surface on the non-skin contact surface of the absorbent body through the adhesive The sheet was fixed. Next, the entire surface of the skin contact surface of the absorbent is covered with a surface sheet, and the skin contact surface side of the surface sheet is embossed according to a conventional method to form a leak-proof groove, and a napkin precursor Got. An adhesive is applied to a predetermined portion of the non-skin contact surface (outer surface of the back sheet) of the napkin precursor obtained in this manner to form an adhesive part, and further, the extension from the peripheral part of the absorber in each of the front and back sheets.
- the end portion was subjected to end sealing according to a conventional method to obtain a napkin.
- an air-through nonwoven fabric (a perforated sheet used for Laurie Softcare manufactured by Kao Corporation) was used as the top sheet, and a polyethylene film having a thickness of 25 ⁇ m was used as the back sheet.
- the napkin generally has the structure shown in FIG. The napkin thus obtained was used as a sample of Example 1.
- an acrylic plate is arranged so that the central axis of the cylindrical injection portion coincides with the central portion of the absorber in plan view, and 6 g of blood is injected from the cylindrical injection portion and absorbed by the sanitary napkin.
- the time (seconds) from when the blood reached the surface of the napkin until the total amount of 6 g was absorbed by the napkin was measured, and this was taken as the absorption time. The smaller the value of this absorption time, the faster the absorption speed and the higher the evaluation.
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Abstract
Description
飽和吸水量の測定は、JIS K 7223(1996)に準拠して行う。ナイロン製の織布(255メッシュ)を幅10cm、長さ40cmの長方形に切断して長手方向中央で二つ折りにし、両端をヒートシールして幅10cm(内寸9cm)、長さ20cmのナイロン袋を作製する。測定試料である吸水性ポリマー1.00gを精秤し、作製したナイロン袋の底部に均一になるように入れる。試料の入ったナイロン袋を、25℃に調温した生理食塩水(0.9質量%塩化ナトリウム水)に浸漬させる。浸漬開始から30分後にナイロン袋を生理食塩水から取り出し、1時間垂直状態に吊るして水切りした後、遠心脱水器(コクサン(株)製、型式H-130C特型)を用いて脱水する。脱水条件は、143G(800rpm)で10分間とする。脱水後、試料の質量を測定し、次式に従って目的とする遠心保持量を算出する。 遠心保持量(g/g)=(a-b-c)/c ;式中、aは遠心脱水後の試料及びナイロン袋の総質量(g)、bはナイロン袋の吸水前(乾燥時)の質量(g)、cは試料の吸水前(乾燥時)の質量(g)を表す。測定は5回行い(n=5)、上下各1点の値を削除し、残る3点の平均値を測定値とした。
初めに、バインダーの主鎖ポリマーの中和滴定曲線を作成する。例えば、バインダーがポリアクリル酸ナトリウムである場合を例にとって説明する。ポリアクリル酸(和光純薬工業、平均分子量25万)のイオン交換水溶液に対して、水酸化ナトリウム溶液を適宜滴下し、pHメーターを用いて該溶液のpHを測定した。この時、ポリアクリル酸の分子量と添加した水酸化ナトリウムのモル数とから中和度を算出し、横軸に中和度、縦軸にpHをプロットし、中和滴定曲線を描いた。中和度は50~100%の範囲で行った。pHメーターには、堀場pHイオンメーターD53、電極型式6583を用いた。次に、バインダー0.1gをイオン交換水20ml中に投入し、10分攪拌後にこの攪拌した溶媒のpHを測定し、得られたpHの値から、前記中和滴定曲線を用いて目的とする中和度を算出した。
吸収性物品から測定対象の吸収体(2枚のシートが重ね合わされた構成の吸収体)を取り出し、該吸収体から、該吸収性物品の長手方向と同方向に40mm、該長手方向と直交する幅方向と同方向に30mm以上の矩形形状を切り出してこれを試験片とし、この試験片の幅方向の一端から約1cmに亘る領域における、該吸収体を構成する2枚のシートを剥離する。こうして、一部が剥離された試験片を、その幅方向が引張方向となるように該幅方向の片端をプッシュプルゲージ(アイコーエンジニアリング製CPUゲージMODEL-9500)に装着した後、該幅方向の他の片端を約300mm/min.の引張速度で引っ張って、一方のシートと他方のシートとにT字剥離し、このときの応力のピーク値を測定する。測定は5回行い、それらの測定値の平均値を吸収体の剥離強度とする。
測定対象の吸収体が組み込まれた吸収性物品を、該吸収性物品を収容可能な大きさを有するビニール袋内に封入し、該ビニール袋を、約20cmの上下動幅で50回ハンドシェイクする。ここで、ハンドシェイクとは、例えば多種の粉体をビニール袋に入れて混ぜ合わせようとするときに行う動作と同じであり、具体的には、吸収性物品が封入されたビニール袋を手で持って鉛直方向に素早く振とうする動作である。ハンドシェイク後、ビニール袋を開封してその中身を目視観察し、吸収性物品から脱落している吸水性ポリマーの個数を数え、これを吸水性ポリマーの脱落数とする。
測定対象の繊維を、その長さ方向と直交する断面方向にスライスする。スライスするときには、繊維の断面面積が極力変化しないように注意する。スライスして得られた繊維の断面を電子顕微鏡を用いて撮像し、その断面写真を画像解析装置(日本アビオニクス社製の「Avio EXCEL」(商品名))により解析し、下記に示す式を用いて目的とする繊維断面の真円度を求めた。尚、該真円度は、任意の繊維断面を100点測定し、その平均値とした。 (繊維断面の真円度)=4×π×(測定繊維の断面面積)/(測定繊維の断面面積の周囲長)2
I―1.重合工程
攪拌機、還流冷却管、モノマー滴下口、窒素ガス導入管、温度計を取り付けたSUS304製5L反応容器(アンカー翼使用)に分散剤としてポリオキシアルキレンエーテルリン酸エステル0.1%(対アクリル酸質量、有効成分量)を仕込み、ノルマルヘプタン1500mlを加えた。窒素ガスの雰囲気下に攪拌を行いながら内温90℃まで昇温した。一方、2L三つ口フラスコ中に、80%アクリル酸(東亞合成製、act.80.6%)とイオン交換水、48%苛性ソーダ水溶液(旭硝子製、act.49.7%)から、モノマー水溶液としてのアクリル酸ナトリウム(72%中和品、濃度約47%)1050gを得た。このモノマー水溶液に、N-アシル化グルタミン酸ソーダ(味の素製、商品名アミソフトPS-11)0.25gをイオン交換水4.4gに溶解させたものを添加した後、550g(以下、モノマー水溶液Aという)、250g(以下、モノマー水溶液Bという)、250g(以下、モノマー水溶液Cという)に三分割した。
前記重合工程に用いたものと同様の反応容器(アンカー翼使用)に、該重合工程で得られた吸水性ポリマー500gを仕込み、分散剤としてショ糖脂肪酸エステル(三菱化学フーズ製、商品名リョートーシュガーエステルS-770)2%(対吸水性ポリマー質量、有効成分量)を仕込み、シクロヘキサン1600mlを加えた。窒素雰囲気下、攪拌しながら、75℃まで昇温した。その後、滴下口から滴下ロートを用いて、イオン交換水300gを滴下し、続いて、イオン交換水10gに、架橋剤としてエチレングリコールジグリシジルエーテル(ナガセケムテックス製、商品名デナコールEX-810)15gを溶解したものを添加し、1.5時間還流させた。
引き続き、市販の水酸化ナトリム30gをイオン交換水500gに溶解した溶液を1時間かけて滴下した。2時間かけて600g脱水した後、冷却し、シクロヘキサンを除去し、乾燥させることにより、吸水性ポリマーIを得た。
合成例1において、架橋工程における架橋剤の使用量を15gから0.25gに変更した以外は合成例1と同様にして、吸水性ポリマーIIを得た。
III-1.重合工程
撹拌機、還流冷却管、モノマー滴下口、窒素ガス導入管、温度計を取り付けたSUS304製5L反応容器(アンカー翼使用)に分散剤として花王(株)エマール20C〔ポリオキシエチレン(EO平均付加モル数3)アルキル(C12)エーテル硫酸エステルNa〕0.15%(対アクリル酸質量)を仕込み、重合溶媒シクロヘキサン1600mlを加えた。窒素ガスの雰囲気下に攪拌を行いながら内温76℃まで昇温した。一方、2L三つ口フラスコ中に、80%アクリル酸(東亞合成製、act.80.6%)とイオン交換水、48%苛性ソーダ水溶液(旭硝子製、act.49.7%)から、モノマー水溶液としてのアクリル酸ナトリウム(76%中和品、濃度約48%)1100gを得た。このモノマー水溶液に、N-アシル化グルタミン酸ソーダ(味の素ヘルシーサプライ(株)製、商品名 アミソフトGS-11F)0.175gをイオン交換水3.15gに溶解させたものを添加し、暫く撹拌した後、275g(以下、モノマー水溶液Dという)、275g(以下、モノマー水溶液Eという)、550g(以下、モノマー水溶液Fという)に三分割した。
シグマ型撹拌翼を2本有するジャケット付き1Lニーダーに、前記重合工程で得られた吸水性ポリマー500gを仕込み、分散剤としてショ糖脂肪酸エステル(三菱化学フーズ製、商品名リョートーシュガーエステルS-770)0.1%(対吸水性ポリマー質量、有効成分量)を仕込み、窒素雰囲気下、攪拌しながら、80℃まで昇温した。続いて、イオン交換水250gに、架橋剤としてエチレングリコールジグリシジルエーテル(ナガセケムテックス製、商品名デナコールEX-810)12.5gを溶解したものを添加し、2時間撹拌させた。その後、乾燥し、吸水性ポリマーIIIを得た。
前記吸水性ポリマーIIIの表面に、アニオン性の水溶性バインダーを付着させた。即ち、シグマ型撹拌翼を2本有するジャケット付き1Lニーダーに、前記吸水性ポリマーIIIを400g仕込み、窒素雰囲気下、攪拌した。続いて、アニオン性の水溶性バインダーとしてのポリアクリル酸塩(MTアクアポリマー製A190、重合平均分子量700万、カルボキシル基の中和度は不明)の5質量%水溶液400gを1時間かけて滴下した。こうして、バインダー処理された吸水性ポリマーIIIを乾燥し、吸水性ポリマーIVを得た。
V-1.重合工程
攪拌機、還流冷却管、モノマー滴下口、窒素ガス導入管、温度計を取り付けたSUS304製5L反応容器(アンカー翼使用)に分散剤としてポリオキシアルキレンエーテルリン酸エステル0.1%(対アクリル酸質量、有効成分量)を仕込み、ノルマルヘプタン1500mlを加えた。窒素ガスの雰囲気下に攪拌を行いながら90℃まで昇温した。一方、2L三つ口フラスコ中に、80%アクリル酸(東亞合成製、act.80.6%)とイオン交換水、48%苛性ソーダ水溶液(旭硝子製、act.49.7%)から、モノマー水溶液としてのアクリル酸ナトリウム(72%中和品、濃度約47%)1000gを得た。このモノマー水溶液に、N-アシル化グルタミン酸ソーダ(味の素製、商品名アミソフトPS-11)0.25gをイオン交換水4.4gに溶解させたものを添加した後、500g(以下、モノマー水溶液Gという)、500g(以下、モノマー水溶液Hという)に二分割した。
窒素雰囲気下、前述の吸水性ポリマー100質量部(固形分換算)、ノルマルヘプタン200質量部を攪拌しながら80~90℃に保ち、その後、イオン交換水60質量部に、架橋剤としてエチレングリコールジグリシジルエーテル(ナガセケムテックス製、商品名デナコールEX-810)3質量部を溶解したものを滴下し、2時間還流させた。
引き続き、水酸化ナトリム6質量部をイオン交換水100質量部に溶解したものを滴下した。その後、共沸脱水により吸水性ポリマー(ハイドロゲル)の含水率35±5%に調整した。
続いて、アニオン性の水溶性バインダーとしてのマレイン酸―アクリル酸塩共重合体のナトリウム塩(BASF製ソカランCP5、重量平均分子量7万、カルボキシル基の中和度は不明)の5質量%水溶液100質量部を滴下した。含水率35±5%まで脱水後、ノルマルヘプタンを除去、乾燥し、吸水性ポリマーVを得た。
合成例5において、アニオン性の水溶性バインダーとして、下記合成法により調製したポリアクリル酸のナトリウム塩A(重量平均分子量25万、カルボキシル基の中和度100モル%)の5質量%水溶液100質量部を用いた以外は合成例5と同様にして、吸水性ポリマーVIを得た。
合成例5において、アニオン性の水溶性バインダーとして、下記合成法により調製したポリアクリル酸のナトリウム塩B(重量平均分子量1万、カルボキシル基の中和度96モル%)の15質量%水溶液100質量部を用いた以外は合成例5と同様にして、吸水性ポリマーVIIを得た。
前記各合成例で得られた吸水性ポリマーI~VIIについて、各種特性(遠心保持量、中和度)を評価した。その結果を下記表1に示す。吸水性ポリマーの遠心保持量の測定は前記方法に従い、吸水性ポリマーの中和度の測定は下記方法に従った。尚、吸水性ポリマーの特性評価には、製造した吸水性ポリマーを分級したものを用いた。
初めに、吸水性ポリマーの主鎖ポリマーの中和滴定曲線を作成する。例えば、吸水性ポリマーがアクリル酸架橋重合体である場合、該吸水性ポリマーの主鎖ポリマーはポリアクリル酸である。以下に、吸水性ポリマーがアクリル酸架橋重合体である場合を例にとって説明する。ポリアクリル酸(和光純薬工業、平均分子量25万)のイオン交換水溶液に対して、水酸化ナトリウム溶液を適宜滴下し、pHメーターを用いて該溶液のpHを測定した。この時、ポリアクリル酸の分子量と添加した水酸化ナトリウムのモル数とから中和度を算出し、横軸に中和度、縦軸にpHをプロットし、中和滴定曲線を描いた。中和度は50~100%の範囲で行った。pHメーターには、堀場pHイオンメーターD53、電極型式6583を用いた。次に、吸水性ポリマー0.1gをイオン交換水20ml中に投入し、10分攪拌後にこの攪拌した溶媒のpHを測定し、得られたpHの値から、前記中和滴定曲線を用いて目的とする中和度を算出した。
前記第2製造方法に従って、図2に示す吸収体30と同様の構成の吸収体を製造した。即ち、繊維シートとしての坪量16g/m2の紙(ティッシュペーパー、幅17cm、長さ30cm)に、公知の乾式法により別途製造した、繊維シートとしてのパルプ積繊体(坪量200g/m2、幅7cm、長さ30cm)を配置した。このティッシュペーパーは、繊維ウェブよりも寸法が大きく、また、架橋処理が施されていないパルプ繊維で構成されている。次いで、パルプ積繊体上の一部(長手方向に19cm、幅方向に5.5cmの範囲)にイオン交換水を0.1g散布した後、該パルプ積繊体における該イオン交換水が散布された部分に、合成例1の吸水性ポリマーIとバインダーとの混合物を均一に散布した。この混合物は、合成例1の吸水性ポリマーIを0.5gと、アニオン性の水溶性バインダーとしてのアクリルアミド-アクリル酸塩共重合体(MTアクアポリマー製A150、重量平均分子量1500万、カルボキシル基の中和度は不明)の5質量%水溶液0.5gとを混合し、その混合物を乾燥して調製されたものであり、吸水性ポリマーIの表面にアニオン性の水溶性バインダーが付着している。次いで、前記ティッシュペーパーで前記パルプ積繊体の全体を被覆した後、厚みが2mmとなるようにプレス加工を行った。更に、前記パルプ積繊体の長手方向前後両端部を曲線状にカットして、長手方向の長さ19cmの吸収体とした。
実施例1において、吸水性ポリマーIとバインダーとの混合物の調製において、アクリルアミド-アクリル酸塩共重合体の5質量%水溶液0.5gに代えて、アニオン性の水溶性バインダーとしてのポリアクリル酸塩(MTアクアポリマー製A190、重量平均分子量700万、カルボキシル基の中和度は不明)の5質量%水溶液0.5gを用いた以外は実施例1と同様にしてナプキンを製造し、実施例2のサンプルとした。
実施例1において、吸水性ポリマーIとバインダーとの混合物の調製において、アクリルアミド-アクリル酸塩共重合体の5質量%水溶液0.5gに代えて、ノニオン性の水溶性バインダーとしてのポリビニルピロリドン(日本触媒製K90、重量平均分子量120万)の5質量%水溶液0.5gを用いた以外は実施例1と同様にしてナプキンを製造し、実施例3のサンプルとした。
実施例1において、吸水性ポリマーIとバインダーとの混合物の調整において、アクリルアミド-アクリル酸塩共重合体の5質量%水溶液0.5gに代えて、アクリルアミド-アクリル酸塩共重合体の3質量%水溶液0.5gを用いた以外は実施例1と同様にしてナプキンを製造し、実施例4のサンプルとした。
実施例1において、吸水性ポリマーIとバインダーとの混合物に代えて、合成例4の吸水性ポリマーIVを用いた。それ以外は実施例1と同様にしてナプキンを製造し、実施例5のサンプルとした。
実施例1において、吸収体を以下のものに置換し、ナプキンの厚み(7g/cm2荷重下における厚み)を3.5mmとした以外は実施例1と同様にしてナプキンを作製し、これを実施例6のサンプルとした。
ホットメルト接着剤(東洋ペトロライト製P-618B)が塗布量5g/m2で塗布された坪量16g/m2のティッシュペーパー(上側繊維シート)の該接着剤の塗布面上に、別途作製したパルプ繊維の繊維ウエブ(坪量200g/m2、幅7cm、長さ17cm)を載置した。このティッシュペーパーは、繊維ウエブよりも寸法が大きい。次いで、繊維ウエブの上から少量のイオン交換水を霧吹きで均一散布し、引き続き、合成例5の吸水性ポリマーV 0.5gを該繊維ウエブ全体に均一に散布した。更に、繊維ウエブの吸水性ポリマー散布面に、接着剤が塗布されていない坪量16g/m2のティッシュペーパー(下側繊維シート)を重ね、前記上側繊維シートにおける該繊維ウエブからの延出部分を該下側繊維シートの上面に巻き上げた後、該繊維ウエブの上下を反転させて、吸収体の略全体がティッシュペーパー(繊維シート)で被覆されてなる平面視において矩形の吸収体を得た。実施例6のナプキンの断面模式図(図5相当図)を図6に示す。図6中、符号20Aは生理用ナプキン、符号21は表面シート、符号22は裏面シート、符号25は防漏溝、符号30Aは吸収体、符号11は吸水性ポリマー、符号31は繊維ウエブ(相対的に厚みの大きい繊維シート)、符号32aは上側繊維シート(相対的に厚みの小さい繊維シート)、符号32bは下側繊維シート(相対的に厚みの小さい繊維シート)である。
実施例6において、吸水性ポリマーVの代わりに、合成例6の吸水性ポリマーVIを用いた。それ以外は実施例6と同様にしてナプキンを製造し、実施例7のサンプルとした。
実施例6において、吸水性ポリマーVの代わりに、合成例7の吸水性ポリマーVIIを用いた。それ以外は実施例6と同様にしてナプキンを製造し、実施例8のサンプルとした。
吸収体の製造においてバインダーを使用しなかった以外は実施例1と同様にしてナプキンを製造し、比較例1のサンプルとした。
合成例2の吸水性ポリマーII(遠心保持量26g/g)を用いた以外は実施例1と同様にしてナプキンを製造し、比較例2のサンプルとした。
吸収体の製造においてバインダーを使用しなかった以外は比較例2と同様にしてナプキンを製造し、比較例3のサンプルとした。
実施例1において、吸水性ポリマーIとバインダーとの混合物の代わりに、合成例3の吸水性ポリマーIIIを用いた。それ以外は実施例1と同様にしてナプキンを製造し、比較例4のサンプルとした。
実施例、比較例の各サンプル(生理用ナプキン)について、前記方法により吸収体の剥離強度及び吸水性ポリマーの脱落数をそれぞれ測定した。また、各サンプルの吸収性能の評価として、下記の方法により吸収時間及び液戻り量を測定すると共に、洗浄性(本明細書では、水洗いによる血液由来の赤みの除去しやすさをいう)の評価として、下記の方法により赤色度合いa*値を測定した。これらの結果を下記表2及び3に示す。
測定対象の生理用ナプキンを平面状に拡げ、表面シートを上に向けて水平面上に固定した状態で、吸収体の中心部における該表面シート上に、円筒状の注入部の付いたアクリル板をのせ、更にそのアクリル板上に錘をのせ、吸収体の中心部に対して、5g/cm2の荷重を加える。アクリル板に設けられた注入部は、内径10mmの円筒状をなし、アクリル板には、長手方向及び幅方向の中心軸に、該円筒状注入部の中心軸線が一致し、該円筒状注入部の内部とアクリル板の表面シート対向面との間を連通する内径10mmの貫通孔が形成されている。次いで、円筒状注入部の中心軸が吸収体の平面視における中心部と一致するようにアクリル板を配置し、6gの血液を、円筒状注入部から注入し、生理用ナプキンに吸収させる。血液がナプキンの表面に到達した時点から6gの全量がナプキンに吸収されるまでの時間(秒)を計測し、これを吸収時間とした。この吸収時間の値が小さいほど、吸収速度が速く、高評価となる。
前記<吸収時間の測定方法>において、血液注入時から3分後に、アクリル板と錘を取り除き、ナプキンの肌当接面上(表面シート上)に、7cm×15cmで坪量30g/m2の吸収紙(市販のティッシュペーパー)を10枚重ねて載置し、該吸収紙の上から68g/cm2の荷重を1分間かけた。荷重後、吸収紙10枚を取り除き、該吸収紙10枚の重さを測定した。この測定値と、予め求めておいた荷重前の吸収紙10枚の重さの測定値とから、吸収紙10枚に吸収された血液の質量(g)を求め、該質量を液戻り量とした。該液戻り量が少ないほど、ナプキンの吸収性能が高く、高評価となる。
下記手順1~3に従って血液が注入され水洗いされた後の、ナプキンにおける血液によって赤色に染まった赤色部分の赤色度合いa*値を測定する。下記手順1~3に従って得られたa*値は、ナプキンの洗浄性の優劣を評価する尺度となるものであり、a*値が小さいほど、赤色部分の赤色の度合いが低く、血液が水洗いによってきれいに洗い流されていることを意味する。
手順2:前記手順1で得られた湿潤状態の生理用ナプキンの表面層側における、血液によって赤色に染まった赤色部分の最も赤みの強い点5箇所について、分光色差計を用いて赤色度合いa*値を測定する。
手順3:前記手順2で得られた5つの測定値から最大値及び最小値を除いた3つの測定値の平均を、生理用ナプキンの赤色度合いa*値とする。
Claims (11)
- JIS K 7223に準拠した遠心保持量が20g/g以下の吸水性ポリマーと繊維シートとを含んで構成され、該吸水性ポリマーと該繊維シートとが、アニオン性又はノニオン性のバインダーを介して互いに接着している吸収体。
- 前記バインダーの重量平均分子量が1万以上である請求項1記載の吸収体。
- 前記バインダーの重量平均分子量が3万以上である請求項2記載の吸収体。
- 前記アニオン性のバインダーが、酸基含有不飽和モノマーを重合して得られるアニオン性の高分子である請求項1~3の何れか一項に記載の吸収体。
- 前記アニオン性のバインダーが、アクリルアミド-アクリル酸塩共重合体又はポリアクリル酸若しくはその塩である請求項1~4の何れか一項に記載の吸収体。
- 前記アニオン性のバインダーがカルボキシル基を有し、該カルボキシル基の中和度が80モル%以上である請求項1~5の何れか一項に記載の吸収体。
- 前記ノニオン性のバインダーが、環状基を有しているノニオン性の高分子である請求項1~3の何れか一項に記載の吸収体。
- 前記ノニオン性のバインダーが、ポリビニルピロリドンである請求項1~3及び7の何れか一項に記載の吸収体。
- 前記バインダーの前記吸水性ポリマーに対する含有質量比(バインダー/吸水性ポリマー)が0.002~0.3である請求項1~8の何れか一項に記載の吸収体。
- 前記繊維シートとして、相対的に厚みの大きいパルプ積繊体と相対的に厚みの小さい紙とを含んでおり、該パルプ積繊体の全体が該紙で被覆された構成を有している請求項1~9の何れか一項に記載の吸収体。
- 請求項1~10の何れか一項に記載の吸収体を含む吸収性物品。
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