WO2022145226A1 - Composite absorber and sanitary article - Google Patents
Composite absorber and sanitary article Download PDFInfo
- Publication number
- WO2022145226A1 WO2022145226A1 PCT/JP2021/046221 JP2021046221W WO2022145226A1 WO 2022145226 A1 WO2022145226 A1 WO 2022145226A1 JP 2021046221 W JP2021046221 W JP 2021046221W WO 2022145226 A1 WO2022145226 A1 WO 2022145226A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- polymer
- water
- liquid discharge
- absorber
- Prior art date
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 74
- 239000002131 composite material Substances 0.000 title claims abstract description 56
- 239000002250 absorbent Substances 0.000 claims abstract description 202
- 230000002745 absorbent Effects 0.000 claims abstract description 191
- 229920000642 polymer Polymers 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 210000001124 body fluid Anatomy 0.000 claims abstract description 71
- 239000010839 body fluid Substances 0.000 claims abstract description 71
- 238000010521 absorption reaction Methods 0.000 claims abstract description 60
- 239000011148 porous material Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 28
- 229920006037 cross link polymer Polymers 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 6
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 52
- 229920000247 superabsorbent polymer Polymers 0.000 description 42
- 206010021639 Incontinence Diseases 0.000 description 40
- 239000000178 monomer Substances 0.000 description 29
- 238000006116 polymerization reaction Methods 0.000 description 29
- 238000000034 method Methods 0.000 description 19
- 239000000470 constituent Substances 0.000 description 18
- 230000000717 retained effect Effects 0.000 description 14
- 238000005259 measurement Methods 0.000 description 13
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000004132 cross linking Methods 0.000 description 11
- 239000000835 fiber Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 229920000620 organic polymer Polymers 0.000 description 11
- 239000003505 polymerization initiator Substances 0.000 description 11
- 239000004094 surface-active agent Substances 0.000 description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 8
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- 210000002700 urine Anatomy 0.000 description 8
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- 230000007062 hydrolysis Effects 0.000 description 7
- 238000006460 hydrolysis reaction Methods 0.000 description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 7
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 6
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- -1 diethylhexyl Chemical group 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
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- 239000002904 solvent Substances 0.000 description 5
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- 239000000853 adhesive Substances 0.000 description 3
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- 239000004342 Benzoyl peroxide Substances 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 2
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- 125000004432 carbon atom Chemical group C* 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
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- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
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- IYFATESGLOUGBX-YVNJGZBMSA-N Sorbitan monopalmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O IYFATESGLOUGBX-YVNJGZBMSA-N 0.000 description 1
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 description 1
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- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 description 1
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- MLICVSDCCDDWMD-KVVVOXFISA-M potassium;(z)-octadec-9-enoate Chemical compound [K+].CCCCCCCC\C=C/CCCCCCCC([O-])=O MLICVSDCCDDWMD-KVVVOXFISA-M 0.000 description 1
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- 238000002798 spectrophotometry method Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/12—Hydrolysis
Definitions
- the present invention relates to a composite absorber and a sanitary product having the same.
- Patent Document 1 describes an absorbent article using an absorbent body formed by combining absorbent resin particles (highly absorbent polymer) having an excellent absorption amount and hydrophilic fibers such as pulp fibers having an excellent absorption rate. Is disclosed.
- SAP highly absorbent polymer
- a conventional absorber when body fluids such as urine and menstrual blood are discharged from the wearer of sanitary goods, the body fluids are quickly absorbed by the pulp in the absorber, temporarily held in the pulp, and then retained in water. It will be handed over to a highly capable SAP and will be retained within the SAP.
- the water retention capacity of the pulp is low, so that the amount of body fluid temporarily held in the pulp, that is, the amount of body fluid transferred from the pulp to the SAP is small, and the water retention capacity of SAP, and thus the water retention capacity of SAP, is low. There was a risk that the absorption performance of the absorber could not be fully exhibited.
- the present invention has been made in view of such a problem, and an object of the present invention is to provide an absorber having high absorption performance.
- One aspect (aspect 1) of the present invention is a complex absorber for absorbing body fluids. It contains a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer.
- the polymer absorbent is a composite absorbent characterized in that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more.
- the polymer absorbent capable of taking in the body fluid into the continuous pores by the capillary phenomenon has a high liquid discharge amount and a liquid discharge rate (that is, a high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
- the composite absorber of the first aspect can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of SAP can be fully utilized and absorbed. It can demonstrate high absorption performance as a body.
- the polymer absorbent in the composite absorber of the above aspect 1, has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times. It is characterized by being.
- the composite absorber of the second aspect Since the polymer absorbent has a high repetitive liquid discharge rate, the composite absorber of the second aspect holds a large amount of body fluid and is high even when the body fluid is repeatedly supplied. It can be discharged at the liquid discharge rate. As a result, the composite absorber of the second aspect can transfer a large amount of body fluid from the polymer absorbent to SAP even when the body fluid is repeatedly supplied, so that the water retention capacity of SAP is further enhanced. It can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
- the liquid transfer amount from the polymer absorbent to the highly absorbent polymer is 5.0 g / g or more. It is characterized by.
- the composite absorber of the third aspect has a liquid transfer amount from the polymer absorbent to the SAP of 5.0 g / g or more, the body fluid temporarily held by the polymer absorbent is more reliably received by the SAP. Can be passed. As a result, the composite absorber of the third aspect can more reliably exhibit high absorption performance.
- the polymer absorbent is a monolithic absorbent.
- the polymer absorbent is a monolithic absorbent, the body fluid can be quickly absorbed and the temporarily held body fluid can be more steadily transferred to the SAP. ..
- the polymer absorbent in any of the composite absorbers of aspects 1 to 4, is a (meth) acrylic acid ester and two or more in one molecule. It is a hydrolyzate of a crosslinked polymer of a compound containing a vinyl group, and is characterized by containing at least one -COONa group.
- the hydrophilic continuous skeleton is likely to be elongated and the continuous pores are likely to be expanded when absorbing the body fluid. A large amount of body fluid can be taken into the continuous pores more quickly, and even higher absorption performance can be exhibited as an absorber.
- yet another aspect (aspect 6) of the present invention is a hygienic product characterized by having the complex absorber according to any one of the above aspects 1 to 5.
- the hygienic product of the sixth aspect has the composite absorber according to any one of the above-mentioned aspects 1 to 5, it can exhibit high absorption performance as a hygienic product.
- FIG. 1 is a schematic plan view of the light incontinence pad 1 in the deployed state as viewed from the skin facing surface side in the thickness direction.
- FIG. 2 is a diagram illustrating a manufacturing process of the absorbent A, which is an example of the polymer absorbent.
- FIG. 3 is an SEM photograph of the absorbent A at a magnification of 50 times.
- FIG. 4 is an SEM photograph of the absorbent A at a magnification of 100 times.
- FIG. 5 is an SEM photograph of the absorbent A at a magnification of 500 times.
- FIG. 6 is an SEM photograph of the absorbent A at a magnification of 1000 times.
- FIG. 7 is an SEM photograph of the absorbent A at a magnification of 1500 times.
- a preferred embodiment of the composite absorber of the present invention will be described in detail using a light incontinence pad 1 which is an example of a hygienic product to which the composite absorber is applied.
- a light incontinence pad 1 which is an example of a hygienic product to which the composite absorber is applied.
- an object placed on a horizontal plane in a deployed state for example, a light incontinence pad, a composite absorber, etc.
- the object is a sanitary product.
- looking in the thickness direction of the object from the surface sheet side is simply called "planar view”.
- the "longitudinal direction” refers to "the direction in which the length of a vertically long object (for example, a light incontinence pad in a deployed state, a composite absorber, etc.) in a plan view is long" and is “the width direction”.
- the short direction of the length of the vertically long object in the plan view and “the thickness direction” refers to "the direction perpendicular to the object placed on the horizontal plane in the unfolded state", and their longitudinal directions.
- the direction, width direction, and thickness direction are orthogonal to each other.
- skin is relatively proximal to the wearer's skin surface when the light incontinence pad 1 is worn in the thickness direction of the light incontinence pad 1. It is referred to as “opposing surface side", and "when the light incontinence pad 1 is worn, the side relatively distal to the wearer's skin surface” is referred to as “non-skin facing surface side”.
- FIG. 1 is a schematic plan view of a light incontinence pad 1 in a deployed state to which the composite absorber 4 according to the embodiment of the present invention is applied.
- the light incontinence pad 1 has a longitudinal direction L and a width direction W in a plan view, and two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction. It has a vertically long outer shape.
- the external shape of the light incontinence pad 1 is not limited to such a mode, and any shape (for example, oval shape, rectangular shape, etc.) according to various uses, usage modes, etc., as long as it is a vertically long shape. Hourglass shape, etc.) can be adopted.
- the light incontinence pad 1 has a liquid-permeable surface sheet 2 that forms the surface of the light incontinence pad 1 on the skin-facing surface side and a back surface that forms the surface of the light incontinence pad 1 on the non-skin-facing surface side.
- a sheet 3 and a composite absorber 4 located between these sheets are provided as a basic configuration.
- an adhesive portion (not shown) which is arranged on the surface of the back surface sheet 3 on the non-skin facing surface side and adhesively fixes the light incontinence pad 1 to the inner surface of clothing such as the wearer's underwear is further provided. I have.
- the light incontinence pad 1 is not limited to such a configuration, and is, for example, located at both ends of the light incontinence pad 1 in the width direction W at a position on the skin facing surface side of the surface sheet 2 and in the longitudinal direction.
- a pair of side sheets for forming a leak-proof wall arranged so as to extend to L, and a plurality of elastic members arranged along the longitudinal direction L in each of the pair of side sheets are provided. May be.
- the composite absorber 4 is located between the front surface sheet 2 and the back surface sheet 3, and can absorb body fluid such as urine that has been discharged from the wearer and has permeated the front surface sheet 2.
- body fluid such as urine that has been discharged from the wearer and has permeated the front surface sheet 2.
- such composite absorber 4 comprises a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer (SAP). Further, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more.
- Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released. Therefore, since the composite absorber 4 containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), the water retention capacity of the SAP is fully utilized. It is possible to exhibit high absorption performance as an absorber.
- the light incontinence pad 1 provided with such a composite absorber 4 can also exhibit high absorption performance as a light incontinence pad.
- the surface sheet 2 extends from one side edge of the light incontinence pad 1 in the longitudinal direction L to the other side edge in a plan view, and
- the light incontinence pad 1 has a vertically long outer shape extending from the vicinity of one side edge of the width direction W to the vicinity of the other side edge.
- the surface sheet 2 is arranged at a position on the skin facing surface side in the thickness direction of the light incontinence pad 1 and forms a contact surface that can come into contact with the wearer's skin, that is, the surface of the light incontinence pad 1 on the skin facing surface side. It is composed of a liquid-permeable sheet-like member.
- the surface sheet 2 has a size slightly larger in the longitudinal direction L and the width direction W than the composite absorber 4 arranged on the non-skin facing surface side of the surface sheet 2. It is joined to the back surface sheet 3 located on the non-skin facing surface side in the peripheral portion.
- the outer shape, various dimensions, basis weight, etc. of the surface sheet are not particularly limited as long as they can be used as the surface sheet of sanitary products, depending on desired liquid permeability, touch, flexibility, strength, and the like. Any external shape, various dimensions, basis weight, etc. can be adopted.
- the back surface sheet 3 extends from one side edge of the light incontinence pad 1 in the longitudinal direction L to the other side edge and extends in the width direction W of the light incontinence pad 1 in a plan view. It has a vertically long outer shape extending from one side edge to the other side edge.
- the back sheet 3 is arranged at a position on the non-skin facing surface side in the thickness direction of the light incontinence pad 1 to form the non-skin facing surface of the light incontinence pad 1 and urine that has permeated the composite absorber 4. It is composed of a liquid-impermeable sheet-like member that prevents body fluids such as those from leaking to the outside of the light incontinence pad 1.
- the outer shape, various dimensions, basis weight, etc. of the back sheet are not particularly limited as long as they can be used as the back sheet of sanitary goods, and are arbitrary according to desired leakage-proof performance, breathability, strength, and the like. It is possible to adopt the external shape, various dimensions, basis weight, etc.
- the composite absorber 4 is one of the longitudinal directions L centered on the central portion of the light incontinence pad 1 in the longitudinal direction L and the width direction W in a plan view. It extends over a wide area in the longitudinal direction L from the vicinity of the side edge to the vicinity of the other side edge, and also in the width direction W, a wide area from the vicinity of one side edge of the width direction W to the vicinity of the other side edge. Further, it has a vertically long outer shape in which two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction.
- the composite absorber 4 has a constricted portion in the central portion in the longitudinal direction in a plan view, which is relatively smaller in width direction than the other portions, and further, the constricted portion. It has a minimum width portion having a minimum width of the composite absorber 4 and a maximum width portion having a maximum width of the composite absorber 4 on the outer side in the longitudinal direction of the constricted portion.
- the composite absorber 4 is arranged between the front surface sheet 2 and the back surface sheet 3 in the thickness direction of the light incontinence pad 1, and can absorb and retain body fluid such as urine that has permeated the front surface sheet 2.
- the water-absorbent member is formed of a water-absorbent material such as a polymer absorbent, a hydrophilic fiber, and a highly absorbent polymer, which will be described later, and a sheet such as a tissue holding the water-absorbent material.
- the composite absorber means a water-absorbent member composed of a water-absorbent material capable of absorbing and holding a body fluid and a sheet holding the water-absorbent material.
- the composite absorber 4 is bonded to each of the front surface sheet 2 and the back surface sheet 3 with an arbitrary adhesive such as a hot melt type adhesive.
- the composite absorber 4 contains a polymer absorbent having a specific liquid ejection property having a hydrophilic continuous skeleton and continuous pores as described above, and a highly absorbent polymer.
- the polymer absorbent will be described later, but the superabsorbent polymer is a powder or granule made of a superabsorbent polymer such as a sodium acrylate copolymer known in the art, and is referred to as SAP (Super Absorbent Polymer). Is to be done.
- the composite absorbent 4 contains only the above-mentioned polymer absorbent and highly absorbent polymer as the water-absorbent material, it further contains a water-absorbent material known in the art. There may be.
- a water-absorbent material include hydrophilic fibers, and more specifically, pulp fibers (for example, crushed pulp and the like), cellulosic fibers such as cotton, rayon, and acetate.
- the composite absorber 4 has a structure in which such a polymer absorbent, a highly absorbent polymer, and any water-absorbent material are covered with a wrap sheet such as a tissue having hydrophilicity.
- the outer shape, various dimensions, basis weight, etc. of the composite absorber are not particularly limited as long as the effects of the present invention are not impaired, and any outer shape according to desired water absorption, flexibility, strength, etc. Various dimensions, basis weight, etc. can be adopted.
- the polymer absorbent is not particularly limited as long as it has a specific liquid discharge property such that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more.
- a polymer compound which is a hydrolyzate of a crosslinked polymer of two or more monomers containing at least (meth) acrylic acid ester and has at least one hydrophilic group as a functional group can be mentioned. More specifically, a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and a polymer compound having at least -COONa group is mentioned. Be done.
- Such a polymer absorbent is an organic porous body having at least one -COONa group in one molecule, and may further have a -COOH group. -COONa groups are distributed substantially uniformly in the skeleton of the porous body.
- the polymer absorbent is a hydrolyzate of such a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and at least one -COONa. If it contains a group, as will be described later, when absorbing body fluids such as urine, the hydrophilic continuous skeleton tends to elongate and the continuous pores also tend to expand, so that more body fluids can be continuously expanded more quickly. It can be taken into the pores and can exhibit even higher absorption performance as an absorber.
- the (meth) acrylic acid ester means an acrylic acid ester or a methacrylic acid ester.
- a hydrophilic continuous skeleton is formed by an organic polymer having at least a -COONa group. , It has a communication hole (continuous pore) that serves as an absorption field for the liquid to be absorbed (that is, body fluid such as urine) between the skeletons. Since the hydrolysis treatment changes the -COOR group (that is, the carboxylic acid ester group) of the crosslinked polymer to a -COONa group or a -COOH group (see FIG. 2), the polymer absorbent is-. It may have a COOR group.
- FIG. 2 is a diagram illustrating a manufacturing process of the absorbent A, which is an example of the polymer absorbent.
- the upper figure shows the constituent raw materials for the polymerization
- the middle figure shows the monolith A which is a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene
- the lower figure shows the monolith A in the middle figure.
- the absorbent A obtained by hydrolysis and drying treatment is shown.
- an absorbent A formed by a hydrolyzate of a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene, which is an example of a polymer absorbent, will be described.
- the polymer absorbent is not limited to such a absorbent A, but is a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound having two or more vinyl groups in one molecule, or , It may be a hydrolyzate of a crosslinked polymer of two or more kinds of monomers containing at least (meth) acrylic acid ester.
- “monolith A” is an organic porous body composed of a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene before hydrolysis treatment, and is “monolithic organic porous”. Sometimes referred to as “polymer”. Further, the “absorbent A” is a hydrolyzate of a crosslinked polymer (monolith A) of (meth) acrylic acid ester and divinylbenzene after being hydrolyzed and dried. In the following description, the absorbent A is in a dry state.
- the absorbent A has a hydrophilic continuous skeleton and continuous pores as described above.
- the absorbent A which is an organic polymer having a hydrophilic continuous skeleton, was obtained by cross-linking and polymerizing a (meth) acrylic acid ester as a polymerization monomer and divinylbenzene as a cross-linking monomer. It is obtained by further hydrolyzing the crosslinked polymer (Monolith A).
- the organic polymer forming a hydrophilic continuous skeleton has an ethylene group polymerization residue (hereinafter referred to as “constituent unit X”) and a crosslinked polymerization residue of divinylbenzene (hereinafter referred to as “constituent unit Y”) as constituent units. ”) And. Furthermore, the polymerization residue (constituent unit X) of the ethylene group in the organic polymer forming the hydrophilic continuous skeleton is the -COONa group or -COOH group and -COONa group generated by hydrolysis of the carboxylic acid ester group. It has both groups. When the polymerization monomer is a (meth) acrylic acid ester, the polymerization residue (constituent unit X) of the ethylene group has an —COONa group, a —COOH group and an ester group.
- the ratio of the crosslinked polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is, for example, 0.1 to 30 mol% with respect to all the constituent units. , Preferably 0.1 to 20 mol%.
- the ratio of the cross-linking polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming a hydrophilic continuous skeleton is It is, for example, about 3%, preferably 0.1 to 10 mol%, and more preferably 0.3 to 8 mol% with respect to all the constituent units.
- the ratio of the crosslinked polymerization residue of the divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is 0.1 mol% or more, the strength of the absorbent A is less likely to decrease, and the divinylbenzene is also difficult to decrease.
- the ratio of the crosslinked polymerization residue of the above is 30 mol% or less, the absorption amount of the liquid to be absorbed is less likely to decrease.
- the organic polymer forming the hydrophilic continuous skeleton may be composed of only the constituent unit X and the constituent unit Y, or in addition to the constituent unit X and the constituent unit Y, It may have a structural unit other than the structural unit X and the structural unit Y, that is, a polymerization residue of a monomer other than the (meth) acrylic acid ester and divinylbenzene.
- Examples of the constituent units other than the constituent unit X and the constituent unit Y include styrene, ⁇ -methylstyrene, vinyltoluene, vinylbenzyl chloride, glycidyl (meth) acrylate, isobutene, butadiene, isoprene, chloroprene, vinyl chloride, and bromide.
- Polymerization residues of monomers such as vinyl, vinylidene chloride, tetrafluoroethylene, (meth) acrylonitrile, vinyl acetate, ethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, trimethylolpropanetri (meth) acrylate Can be mentioned.
- the ratio of the structural units other than the structural unit X and the structural unit Y in the organic polymer forming the hydrophilic continuous skeleton is, for example, 0 to 50 mol%, preferably 0 to 30 with respect to all the structural units. It is mol%.
- the absorbent A preferably has a hydrophilic continuous skeleton having a thickness of 0.1 to 100 ⁇ m.
- the thickness of the hydrophilic continuous skeleton of the absorbent A is 0.1 ⁇ m or more, the space (pores) for taking in the absorption target liquid (body fluid) in the porous body is less likely to be crushed during absorption, and the absorption amount is reduced. It becomes difficult to do.
- the thickness of the hydrophilic continuous skeleton is 100 ⁇ m or less, an excellent absorption rate can be easily obtained.
- the thickness of the continuous skeleton is measured by using the skeleton cross section appearing on the test piece for electron microscope measurement as the evaluation point of the thickness. ..
- the continuous skeleton is often formed in a polygonal shape because it is formed at intervals between water (water droplets) that are removed by dehydration / drying treatment after hydrolysis. Therefore, the thickness of the continuous skeleton is the average value of the diameters ( ⁇ m) of the circles circumscribing the polygonal cross section. Also, in rare cases, there may be a small hole in the polygon, in which case the circumscribed circle of the cross section of the polygon surrounding the small hole is measured.
- the absorbent A preferably has an average diameter of continuous pores of 1 to 1000 ⁇ m.
- the average diameter of the continuous pores of the absorbent A is 1 ⁇ m or more, the space (pores) for taking in the absorption target liquid (body fluid) of the porous body is less likely to be crushed during absorption, and the absorption rate is less likely to decrease. ..
- the average diameter of the continuous pores is 1000 ⁇ m or less, an excellent absorption rate can be easily obtained.
- the average diameter ( ⁇ m) of the continuous pores of the absorbent A can be measured by the mercury intrusion method, and the maximum value of the pore distribution curve obtained by the mercury intrusion method is adopted.
- a sample for measuring the average diameter of the continuous pores a sample dried for 18 hours or more in a vacuum dryer set at a temperature of 50 ° C. is used regardless of the ionic form of the absorbent A.
- the final ultimate pressure is 0 Torr.
- FIG. 3 is an SEM photograph having a magnification of 50 times for the absorbent A
- FIG. 4 is an SEM photograph having a magnification of 100 times for the absorbent A
- FIG. 5 is an SEM photograph having a magnification of 500 for the absorbent A. It is a double SEM photograph
- FIG. 6 is an SEM photograph having a magnification of 1000 times for the absorbent A
- FIG. 7 is an SEM photograph having a magnification of 1500 times for the absorbent A.
- the absorbent A shown in FIGS. 3 to 7 is an example of an absorbent having butyl methacrylate as a polymerization monomer and divinylbenzene as a cross-linking monomer, and each has a cubic structure of 2 mm square.
- the absorbent A shown in FIGS. 3 to 7 has a large number of bubble-shaped macropores, and further has a portion where these bubble-shaped macropores overlap each other.
- the absorbent A has an open cell structure in which the overlapping portions of the macropores have a common opening (mesopore), that is, an open cell structure (continuous macropore structure).
- the portion where the macropores overlap each other has a common opening (mesopore) having an average diameter of 1 to 1000 ⁇ m, preferably 10 to 200 ⁇ m, particularly preferably 20 to 100 ⁇ m in a dry state, and most of them have an open pore structure. It has become.
- the average diameter of the mesopore in a dry state is 1 ⁇ m or more, the absorption rate of the liquid to be absorbed becomes better.
- the average diameter of the mesopore in a dry state is 1000 ⁇ m or less, the absorbent A is less likely to become brittle. It should be noted that the number of such macropores overlapped with each other is about 1 to 12 for one macropore, and about 3 to 10 for most macropores.
- the absorbent A has such an open cell structure, the macropore group and the mesopore group can be uniformly formed, and the particle aggregation type as described in Japanese Patent Application Laid-Open No. 8-252579 etc. can be formed uniformly. Compared to the porous body, there is an advantage that the pore volume and the specific surface area can be significantly increased.
- the total pore volume of the pores (pores) of the absorbent A is preferably 0.5 to 50 mL / g, more preferably 2 to 30 mL / g.
- the total pore volume of the absorbent A is 0.5 mL / g or more, the space (pores) for taking in the absorption target liquid (body fluid) of the porous body is less likely to be crushed during absorption, and the absorption amount and absorption rate Is less likely to decrease.
- the total pore volume of the absorbent A is 50 mL / g or less, the strength of the absorbent A is less likely to decrease.
- the total pore volume can be measured by the mercury intrusion method.
- a sample dried for 18 hours or more in a vacuum dryer set at a temperature of 50 ° C. is used regardless of the ionic form of the absorbent A.
- the final ultimate pressure is 0 Torr.
- body fluid a liquid such as a body fluid
- the mass of the absorbed body fluid is substantially proportional to the amount of the body fluid, the mass of the body fluid may be simply referred to as "the amount of the body fluid" in the following description.
- the continuous pores included in the absorbent A shown in FIGS. 3 to 7 are pores in which a plurality of pores (pores) communicate with each other, and a large number of pores are provided from the appearance. Can be visually recognized with the naked eye.
- a certain amount of the body fluid enters the large number of pores and is absorbed by the absorbent A due to the capillary phenomenon.
- some of the body fluids absorbed by the absorbent A are absorbed into the hydrophilic continuous skeleton by osmotic pressure, and the continuous skeleton is elongated.
- the body fluids that are not absorbed in the hydrophilic continuous skeleton are absorbed in a state of being retained in the pores.
- the absorbent A has a property that the hydrophilic continuous skeleton is elongated when the body fluid is absorbed. This extension of the continuous skeleton occurs in almost all directions. Further, as the outer shape of the absorbent A becomes larger due to the extension of the continuous skeleton, the size of each pore also becomes larger. As the size of the vacancies increases in this way, the volume inside the vacancies increases, so that the amount of body fluid that can be retained in the vacancies also increases. That is, the absorbent A, which has become larger by absorbing a certain amount of body fluid, can further absorb a predetermined amount of body fluid into the enlarged pores by the capillary phenomenon. Further, since the absorbent A absorbs the body fluid by the capillary phenomenon, the body fluid can be quickly absorbed.
- the amount of body fluid absorbed by the absorbent A is larger than that absorbed in the hydrophilic continuous skeleton. Since most of the absorption of body fluid by the absorbent A is performed by retaining the body fluid in the pores by capillarity, the porosity (absorbent A) which is the ratio of the volume of the voids in the pores (total pore volume). The larger the volume of the voids in the pores relative to the volume of the pores), the more body fluid can be absorbed.
- the porosity is preferably 85% or more.
- the porosity of the absorbent A shown in FIGS. 3 to 7 described above is as follows.
- the specific surface area of the absorbent A obtained by the mercury intrusion method is 400 m 2 / g, and the pore volume is 15.5 mL / g.
- This pore volume of 15.5 mL / g means that the volume of the pores in 1 g of the absorbent A is 15.5 mL.
- the specific gravity of the absorbent A is 1 g / mL
- the volume occupied by the pores in 1 g of the absorbent A that is, the pore volume is 15.5 mL
- the volume of the absorbent A of 1 g. Becomes 1 mL.
- the total volume (volume) of 1 g of the absorbent A becomes 15.5 + 1 (mL), and the ratio of the pore volume thereof becomes the porosity. Therefore, the porosity of the absorbent A is 15.5 / (. 15.5 + 1) ⁇ 100 ⁇ 94%.
- the absorbent A having such a hydrophilic continuous skeleton and continuous pores that is, the polymer absorbent is in the form of particles, sheets, etc., and the above-mentioned light incontinence pad 1 is used. It is applied to a complex absorber for absorbing body fluid such as urine, such as the complex absorber 4 of the above. Further, as described above, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more. There is.
- Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and further has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released. Therefore, the composite absorber of the present invention containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of the SAP is sufficient. It can be utilized and can exhibit high absorption performance as an absorber.
- SAP highly absorbent polymer
- the liquid discharge amount of the polymer absorbent is particularly preferably 35 g / g or more, and the liquid discharge rate is more preferably 70% or more, particularly preferably 75% or more. preferable.
- the liquid discharge amount and the liquid discharge rate of these polymer absorbents can be measured as follows.
- ⁇ Measurement method of liquid discharge amount and liquid discharge rate of polymer absorbent> (1) Mesh bag obtained by cutting 1 g of a sample (polymer absorbent) for measurement into 10 cm squares (manufactured by NBC Meshtec Inc., N-NO255HD 115 (standard width: 115 cm, 255 mesh / 2.54 cm, opening:) Enclose in 57 ⁇ m, wire diameter: 43 ⁇ m, thickness: 75 ⁇ m)). The mass (g) of the mesh bag is measured in advance. Further, this measuring method is carried out under the conditions of a temperature of 25 ° C. and a humidity of 60%.
- the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to ⁇ Method for recovering sample for measurement (polymer absorbent) described later>.
- (2) Immerse the mesh bag containing the sample in physiological saline (0.9% sodium chloride aqueous solution) for 1 hour.
- (3) The mass (g) after hanging the mesh bag for 5 minutes and draining it is measured.
- the mesh bag after draining in (3) above is subjected to centrifugation at 150 G for 90 seconds, and the mass (g) of the mesh bag after the centrifugation is measured.
- the liquid discharge amount (g / g) per unit mass of the sample (polymer absorbent) is obtained.
- the sample (polymer absorbent) is obtained by dividing the liquid discharge amount per unit mass obtained in (6) above by the water absorption amount per unit mass obtained in (4) above and multiplying by 100.
- the liquid discharge amount with respect to the water absorption amount, that is, the liquid discharge rate (%) is obtained.
- the repeated liquid discharge rate after repeating water absorption and water separation three times, which will be described later, means the liquid discharge rate (%) after repeating the above steps (2) to (6) three times.
- ⁇ Method of recovering sample (polymer absorbent) for measurement> Peel off the surface sheet or the like from the hygienic product to expose the composite absorber.
- the magnification of the simple loupe is not particularly limited as long as the pores of the porous body can be visually recognized, and examples thereof include a magnification of 25 to 50 times.
- (4) The measurement object thus recovered is used as a sample for measurement in various measurement methods.
- a polymer absorbent as an example of the present invention a pulp fiber (fluff pulp) as a comparative example, an Infinity particle body as a comparative example, and a highly absorbent polymer (SAP) as a comparative example are used.
- a pulp fiber fluff pulp
- an Infinity particle body as a comparative example
- SAP highly absorbent polymer
- the measurement results of the liquid discharge amount and the liquid discharge rate are shown in Table 1 below.
- the Infinity particle body is an absorbent manufactured by P & G, and although it has a structure (foaming structure) similar to that of a polymer absorbent, it absorbs liquid unlike a polymer absorbent. It does not have the function of expanding.
- the pulp fiber and the Infinity particle body show a high liquid discharge rate
- the liquid discharge amount is small because the water absorption amount itself is small.
- the pulp fiber shows a tendency that both the liquid discharge amount and the liquid discharge rate decrease as the number of times of water absorption and water separation (“water absorption / water separation frequency” in Table 1) increases.
- SAP has a large amount of water absorption, it shows a liquid discharge amount of a certain level or more, but the liquid discharge rate is small due to its water retention capacity.
- the polymer absorbent exhibits a high liquid discharge rate and liquid discharge rate (that is, exhibits high water retention capacity and excellent water release property (water release)).
- the polymer absorbent has a stable and high liquid discharge amount and liquid discharge rate regardless of the number of times of water absorption and water separation being repeated 1 to 3, so that the body fluid is repeatedly supplied. It can be seen that even in some cases, a large amount of body fluid can be retained and discharged at a high liquid discharge rate. That is, it can be seen that the polymer absorbent has excellent liquid ejection properties peculiar to conventional pulp fibers, Infinity particles, SAP and the like.
- the polymer absorbent preferably has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times.
- the polymer absorbent has such a high repetitive liquid discharge rate, even when the body fluid is repeatedly supplied, a large amount of body fluid is retained and discharged at a high liquid discharge rate. can do.
- the composite absorber containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the SAP even when the body fluid is repeatedly supplied, and thus the SAP.
- the water retention capacity can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
- the repeated liquid discharge rate of the polymer absorbent after repeating water absorption and water separation three times is more preferably 70% or more, and particularly preferably 75% or more.
- the composite absorber preferably has a liquid transfer amount from the polymer absorbent to SAP of 5.0 g / g or more.
- a liquid transfer amount from the polymer absorbent to SAP of 5.0 g / g or more.
- the amount of liquid transferred from the polymer absorbent to SAP is more preferably 23.0 g / g or more, further preferably 27.0 g / g or more, and particularly preferably 33.0 g / g or more.
- the amount of liquid transferred from this polymer absorbent to SAP can be measured as follows.
- Nylon mesh material on the bottom surface N-NO255HD 115 manufactured by NBC Mesh Tech Co., Ltd. (standard width: 115 cm, 255 mesh / 2.54 cm, opening: 57 ⁇ m, wire diameter: 43 ⁇ m, thickness: 75 ⁇ m))
- a plastic cylinder inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g
- 0.3 g of a sample for measurement (polymer absorbent) is placed uniformly. Break in and measure the mass (g) of the cylinder. This measuring method is performed under the conditions of a temperature of 25 ° C. and a humidity of 60%.
- the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to the above-mentioned ⁇ Method for recovering the sample for measurement (polymer absorbent)>.
- a plastic cylinder (inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g) is placed in a petri dish (inner diameter: 85 mm, depth: 20 mm), and a highly absorbent polymer (SAP) is placed. After evenly sprinkling 0.3 g into the cylinder, remove the cylinder and measure the mass (g) of the petri dish.
- Chloride with pedestal (inner diameter: 85 mm, depth: 20 mm, pedestal arrangement: two pedestals arranged in parallel at 24 mm intervals in the center of the bottom surface (inner surface side), pedestal width: 2 mm, pedestal height: 2 mm , Pedestal length: 25 mm), add 60 mL of physiological saline (0.9% sodium chloride aqueous solution).
- the cylinder after draining in (5) above is placed on a petri dish containing SAP, and the sample in the cylinder and the SAP in the petri dish are passed through the bottom surface (mesh material) of the cylinder. Make contact.
- the cylinder is removed and the mass (g) of the petri dish is measured.
- the water absorption amount (g) of the SAP is calculated by subtracting the mass (g) of the dome measured in (8) above by the mass (g) of the planet measured in (2) above, and the water absorption amount is further calculated.
- the water absorption amount of SAP per unit mass of the sample (g / g), that is, the amount of liquid transferred to the SAP per unit mass of the sample (g / g) is obtained. ..
- the above-mentioned absorbent A can be obtained by undergoing a cross-linking polymerization step and a hydrolysis step. Hereinafter, each of these steps will be described.
- Cross-link polymerization step First, an oil-soluble monomer for cross-linking polymerization, a cross-linking monomer, a surfactant, water, and, if necessary, a polymerization initiator are mixed to obtain a water-in-oil emulsion.
- This water-in-oil emulsion is an emulsion in which the oil phase becomes a continuous phase and water droplets are dispersed therein.
- butyl methacrylate which is a (meth) acrylic acid ester
- divinylbenzene is used as the crosslinkable monomer
- surfactant is used.
- Crosslink polymerization is carried out using sorbitan monooleate as an activator and isobutyronitrile as a polymerization initiator to obtain monolith A.
- this emulsion is immediately transferred to a reaction vessel, sealed, and polymerized at 60 ° C. for 24 hours under the static condition. After completion of the polymerization, the contents are taken out, extracted with methanol, and dried under reduced pressure to obtain Monolith A having a continuous macropore structure.
- the monolith A had an open cell structure and the thickness of the continuous skeleton was 5.4 ⁇ m.
- the average diameter of the continuous pores measured by the mercury intrusion method was 36.2 ⁇ m, and the total pore volume was 15.5 mL / g.
- the content of divinylbenzene with respect to all the monomers is preferably 0.3 to 10 mol%, more preferably 0.3 to 5 mol%. Further, the ratio of divinylbenzene to the total of butyl methacrylate and divinylbenzene is preferably 0.1 to 10 mol%, more preferably 0.3 to 8 mol%. In the above-mentioned absorbent A, the ratio of butyl methacrylate to the total of butyl methacrylate and divinylbenzene is 97.0 mol%, and the ratio of divinylbenzene is 3.0 mol%.
- the amount of the surfactant added can be set according to the type of the oil-soluble monomer and the size of the desired emulsion particles (macropores), and is about 2 to 70 with respect to the total amount of the oil-soluble monomer and the surfactant. It is preferably in the range of%.
- alcohols such as methanol and stearyl alcohol
- carboxylic acids such as stearic acid
- hydrocarbons such as octane, dodecane and toluene
- cyclic ethers such as tetrahydrofuran and dioxane are used. It may coexist in the polymerization system.
- the mixing method for forming the water-in-oil emulsion is not particularly limited.
- a method of mixing each component at once, an oil-soluble monomer, a surfactant, and an oil-soluble polymerization initiator, which are oil-soluble can be adopted.
- the mixing device for forming the emulsion is not particularly limited, and any device such as a normal mixer, a homogenizer, or a high-pressure homogenizer can be adopted depending on the desired emulsion particle size, and further, the object to be treated can be used.
- a so-called planetary stirrer or the like can also be used, in which an object is placed in a mixing container and the mixture is rotated while revolving around a revolving axis in an inclined state to stir and mix the object to be processed.
- the mixing conditions are not particularly limited, and the stirring rotation speed, stirring time, etc. can be arbitrarily set according to the desired emulsion particle size.
- water droplets in the W / O emulsion can be uniformly generated, and the average diameter thereof can be arbitrarily set in a wide range.
- the polymerization conditions of the water-in-oil emulsion depending on the type of monomer and initiator.
- the polymerization is carried out by heating at a temperature of 30 to 100 ° C. for 1 to 48 hours in a sealed container under an inert atmosphere.
- hydrogen peroxide-ferrous chloride, sodium persulfate-sodium acid sulfite, etc. are used as the polymerization initiator, the temperature is 0 to 30 ° C. for 1 to 48 hours in a sealed container under an inert atmosphere. It may be polymerized.
- the unreacted monomer and the residual surfactant can be removed by taking out the contents and performing Soxhlet extraction with a solvent such as isopropanol to obtain Monolith A shown in the middle figure of FIG. ..
- monolith A is immersed in dichloroethane containing zinc bromide, stirred at 40 ° C. for 24 hours, and hydrolyzed by contacting it with methanol, 4% hydrochloric acid, 4% sodium hydroxide aqueous solution and water in this order. After that, it is dried to obtain a block-shaped absorbent A. Further, the block-shaped absorbent A is pulverized to a predetermined size to obtain a particulate absorbent A.
- the form of the absorbent A is not limited to particles, and may be formed into a sheet during or after drying, for example.
- the method for hydrolyzing Monolith A is not particularly limited, and various methods can be adopted.
- aromatic solvents such as toluene and xylene
- halogen solvents such as chloroform and dichloroethane
- ether solvents such as tetrahydrofuran and isopropyl ether
- amide solvents such as dimethylformamide and dimethylacetamide
- alcohol solvents such as methanol and ethanol.
- P-solvented acid such as toluenesulfonic acid or Lewis acid such as zinc bromide, aluminum chloride, aluminum bromide, titanium chloride (IV), cerium chloride / sodium iodide, magnesium iodide, etc. Be done.
- the (meth) acrylic acid ester is not particularly limited, but the (meth) acrylic acid has C1 to C10 (that is, the number of carbon atoms). Alkyl esters of 1 to 10) are preferable, and C4 (that is, 4 carbon atoms) alkyl esters of (meth) acrylic acid are particularly preferable.
- the C4 alkyl ester of (meth) acrylic acid include (meth) acrylic acid t-butyl ester, (meth) acrylic acid n-butyl ester, and (meth) acrylic acid iso-butyl ester.
- the monomer used for the cross-linking polymerization may be only (meth) acrylic acid ester and divinylbenzene, and in addition to (meth) acrylic acid ester and divinylbenzene, other than (meth) acrylic acid ester and divinylbenzene. It may contain other monomers. In the latter case, the other monomer is not particularly limited, but for example, styrene, ⁇ -methylstyrene, vinyltoluene, vinylbenzyl chloride, glycidyl (meth) acrylate, diethylhexyl (meth) acrylate, isobutene, butadiene, isobrene.
- the proportion of the monomers other than the (meth) acrylic acid ester and divinylbenzene in all the monomers used for the cross-linking polymerization is preferably 0 to 80 mol%, more preferably 0 to 50 mol%.
- the surfactant is not limited to the above-mentioned sorbitan monooleate, and may be any one that can form a water-in-oil (W / O) emulsion when the cross-linking polymerization monomer and water are mixed. ..
- surfactants include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene group nonylphenyl ether, polyoxyethylene group stearyl ether, and polyoxyethylene group sorbitan.
- Nonionic surfactants such as monooleate, anionic surfactants such as potassium oleate, sodium dodecylbenzenesulfonate, sodium dioctyl sulfosuccinate, cationic surfactants such as distearyldimethylammonium chloride, lauryldimethylbetaine and the like. Androgynous surfactants can be mentioned. These surfactants may be used alone or in combination of two or more.
- the polymerization initiator a compound that generates radicals by heat and light irradiation is preferably used.
- the polymerization initiator may be water-soluble or oil-soluble, and may be, for example, azobis (4-methoxy-2,4-dimethylvaleronitrile), azobisisobutyronitrile, azobisdimethylvaleronitrile, azobiscyclohexanenitrile, etc.
- Azobiscyclohexanecarbonitrile azobis (2-methylpropionamidine) dihydrochloride
- benzoyl peroxide potassium persulfate, ammonium persulfate, hydrogen peroxide-ferrous chloride, sodium persulfate-sodium acid sulfite, tetramethylthium disulfide, etc.
- the polymerization proceeds only by heating or light irradiation without adding the polymerization initiator, so that it is not necessary to add the polymerization initiator in such a system.
- the composite absorber of the present invention includes, for example, a pants-type disposable diaper, a tape-type disposable diaper, a sanitary napkin, an absorbent liner, and an absorbent pad (for example, a decubitus pad or a decubitus pad).
- an absorbent pad for example, a decubitus pad or a decubitus pad.
- Applicable to various hygiene products such as (pads, etc.), absorbent sheets, breast milk pads, disposable diapers for pets, absorbent pads for pets, excrement disposal sheets for pets, wet sheets, wet wipes, cosmetic wipes, masks, etc. can do. Therefore, the body fluid to be absorbed by the composite absorber is a liquid discharged from the wearer of the sanitary goods, and examples thereof include urine, sweat, stool, menstrual blood, cage, breast milk, blood, and exudate. Be done.
- present invention is not limited to the above-described embodiments and the like, and can be appropriately combined, substituted, modified, etc. within the range not deviating from the object and purpose of the present invention.
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Abstract
The present invention provides an absorber having high absorption performance. A composite absorber (4) of the present invention is a composite absorber for absorbing body fluids, and is characterized by comprising: a polymeric absorbent provided with a hydrophilic continuous skeleton and continuous pores; and a highly absorbent polymer, wherein the polymeric absorbent is such that a liquid discharge amount of absorbed moisture is 20 g/g or higher, and a liquid discharge rate is 65% or higher.
Description
本発明は、複合吸収体及びそれを有する衛生用品に関する。
The present invention relates to a composite absorber and a sanitary product having the same.
使い捨ておむつや生理用ナプキン等の衛生用品においては、高い吸収量を有する高吸収性ポリマー(いわゆる「SAP」)を用いたものが知られている。例えば、特許文献1には、吸収量が優れた吸収性樹脂粒子(高吸収性ポリマー)と、吸収速度が優れたパルプ繊維等の親水性繊維とを組み合わせてなる吸収体を用いた吸収性物品が開示されている。
As sanitary products such as disposable diapers and menstrual napkins, those using a highly absorbent polymer (so-called "SAP") having a high absorption amount are known. For example, Patent Document 1 describes an absorbent article using an absorbent body formed by combining absorbent resin particles (highly absorbent polymer) having an excellent absorption amount and hydrophilic fibers such as pulp fibers having an excellent absorption rate. Is disclosed.
このような高吸収性ポリマー(SAP)は、多量の水分を保水することができる(すなわち、保水能力が高い)一方で、吸水速度が遅いため、従来の吸収体においては、一時的に素早く保水できるようにパルプと併せて用いられている。かかる従来の吸収体では、衛生用品の着用者から尿や経血等の体液が排出されると、体液は、吸収体内のパルプによって素早く吸収され、パルプ内に一時的に保持された後、保水能力の高いSAPへ受け渡されて、SAP内で保持されることとなる。
しかしながら、このような従来の吸収体では、パルプの保水能力が低いため、パルプに一時的に保持される体液の量、すなわちパルプからSAPへ受け渡す体液の量が少なく、SAPの保水能力、ひいては吸収体の吸収性能を十分に発揮できない恐れがあった。 While such a highly absorbent polymer (SAP) can retain a large amount of water (that is, has a high water retention capacity), it has a slow water absorption rate, so that in a conventional absorber, it temporarily and quickly retains water. It is used in combination with pulp so that it can be used. In such a conventional absorber, when body fluids such as urine and menstrual blood are discharged from the wearer of sanitary goods, the body fluids are quickly absorbed by the pulp in the absorber, temporarily held in the pulp, and then retained in water. It will be handed over to a highly capable SAP and will be retained within the SAP.
However, in such a conventional absorber, the water retention capacity of the pulp is low, so that the amount of body fluid temporarily held in the pulp, that is, the amount of body fluid transferred from the pulp to the SAP is small, and the water retention capacity of SAP, and thus the water retention capacity of SAP, is low. There was a risk that the absorption performance of the absorber could not be fully exhibited.
しかしながら、このような従来の吸収体では、パルプの保水能力が低いため、パルプに一時的に保持される体液の量、すなわちパルプからSAPへ受け渡す体液の量が少なく、SAPの保水能力、ひいては吸収体の吸収性能を十分に発揮できない恐れがあった。 While such a highly absorbent polymer (SAP) can retain a large amount of water (that is, has a high water retention capacity), it has a slow water absorption rate, so that in a conventional absorber, it temporarily and quickly retains water. It is used in combination with pulp so that it can be used. In such a conventional absorber, when body fluids such as urine and menstrual blood are discharged from the wearer of sanitary goods, the body fluids are quickly absorbed by the pulp in the absorber, temporarily held in the pulp, and then retained in water. It will be handed over to a highly capable SAP and will be retained within the SAP.
However, in such a conventional absorber, the water retention capacity of the pulp is low, so that the amount of body fluid temporarily held in the pulp, that is, the amount of body fluid transferred from the pulp to the SAP is small, and the water retention capacity of SAP, and thus the water retention capacity of SAP, is low. There was a risk that the absorption performance of the absorber could not be fully exhibited.
本発明は、このような問題に鑑みてなされたものであり、吸収性能の高い吸収体を提供することを目的とする。
The present invention has been made in view of such a problem, and an object of the present invention is to provide an absorber having high absorption performance.
本発明の一態様(態様1)は、体液を吸収するための複合吸収体であって、
親水性の連続骨格及び連続空孔を備えた高分子吸収剤と、高吸収性ポリマーと、を含み、
前記高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であることを特徴とする複合吸収体である。 One aspect (aspect 1) of the present invention is a complex absorber for absorbing body fluids.
It contains a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer.
The polymer absorbent is a composite absorbent characterized in that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more.
親水性の連続骨格及び連続空孔を備えた高分子吸収剤と、高吸収性ポリマーと、を含み、
前記高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であることを特徴とする複合吸収体である。 One aspect (aspect 1) of the present invention is a complex absorber for absorbing body fluids.
It contains a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer.
The polymer absorbent is a composite absorbent characterized in that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more.
本態様1の複合吸収体は、毛細管現象によって体液を連続空孔に取り込み得る高分子吸収剤が、高い液吐出し量及び液吐出し率を有していることで(すなわち、高い保水能力と優れた水分放出性(離水性)を有していることで)、一度に多量の体液を保持することができるとともに、吸収・保持した体液を多量に放出することができる。
これにより、本態様1の複合吸収体は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。 In the composite absorber of the first aspect, the polymer absorbent capable of taking in the body fluid into the continuous pores by the capillary phenomenon has a high liquid discharge amount and a liquid discharge rate (that is, a high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
As a result, the composite absorber of the first aspect can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of SAP can be fully utilized and absorbed. It can demonstrate high absorption performance as a body.
これにより、本態様1の複合吸収体は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。 In the composite absorber of the first aspect, the polymer absorbent capable of taking in the body fluid into the continuous pores by the capillary phenomenon has a high liquid discharge amount and a liquid discharge rate (that is, a high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
As a result, the composite absorber of the first aspect can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of SAP can be fully utilized and absorbed. It can demonstrate high absorption performance as a body.
また、本発明の別の態様(態様2)では、上記態様1の複合吸収体において、前記高分子吸収剤は、吸水及び離水を3回繰り返した後の繰返し液吐出し率が65%以上であることを特徴とする。
Further, in another aspect (aspect 2) of the present invention, in the composite absorber of the above aspect 1, the polymer absorbent has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times. It is characterized by being.
本態様2の複合吸収体は、高分子吸収剤が高い繰返し液吐出し率を有しているため、体液が繰返し供給されるような場合であっても、多量の体液を保持して、高い液吐出し率で放出することができる。
これにより、本態様2の複合吸収体は、体液が繰返し供給されるような場合であっても、高分子吸収剤からSAPへ多量の体液を受け渡すことができるため、SAPの保水能力をより一層活用することができ、高い吸収性能を長時間にわたって持続的に発揮することができる。 Since the polymer absorbent has a high repetitive liquid discharge rate, the composite absorber of the second aspect holds a large amount of body fluid and is high even when the body fluid is repeatedly supplied. It can be discharged at the liquid discharge rate.
As a result, the composite absorber of the second aspect can transfer a large amount of body fluid from the polymer absorbent to SAP even when the body fluid is repeatedly supplied, so that the water retention capacity of SAP is further enhanced. It can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
これにより、本態様2の複合吸収体は、体液が繰返し供給されるような場合であっても、高分子吸収剤からSAPへ多量の体液を受け渡すことができるため、SAPの保水能力をより一層活用することができ、高い吸収性能を長時間にわたって持続的に発揮することができる。 Since the polymer absorbent has a high repetitive liquid discharge rate, the composite absorber of the second aspect holds a large amount of body fluid and is high even when the body fluid is repeatedly supplied. It can be discharged at the liquid discharge rate.
As a result, the composite absorber of the second aspect can transfer a large amount of body fluid from the polymer absorbent to SAP even when the body fluid is repeatedly supplied, so that the water retention capacity of SAP is further enhanced. It can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
本発明の更に別の態様(態様3)では、上記態様1又は2の複合吸収体において、前記高分子吸収剤から前記高吸収性ポリマーへの液移行量が5.0g/g以上であることを特徴とする。
In still another aspect (aspect 3) of the present invention, in the composite absorber of the above aspect 1 or 2, the liquid transfer amount from the polymer absorbent to the highly absorbent polymer is 5.0 g / g or more. It is characterized by.
本態様3の複合吸収体は、高分子吸収剤からSAPへの液移行量が5.0g/g以上であるため、高分子吸収剤が一時的に保持した体液を、より確実にSAPへ受け渡すことができる。
これにより本態様3の複合吸収体は、高い吸収性能を更に確実に発揮することができる。 Since the composite absorber of the third aspect has a liquid transfer amount from the polymer absorbent to the SAP of 5.0 g / g or more, the body fluid temporarily held by the polymer absorbent is more reliably received by the SAP. Can be passed.
As a result, the composite absorber of the third aspect can more reliably exhibit high absorption performance.
これにより本態様3の複合吸収体は、高い吸収性能を更に確実に発揮することができる。 Since the composite absorber of the third aspect has a liquid transfer amount from the polymer absorbent to the SAP of 5.0 g / g or more, the body fluid temporarily held by the polymer absorbent is more reliably received by the SAP. Can be passed.
As a result, the composite absorber of the third aspect can more reliably exhibit high absorption performance.
本発明の更に別の態様(態様4)では、上記態様1~3のいずれかの複合吸収体において、前記高分子吸収剤は、モノリス状の吸収剤であることを特徴とする。
In still another aspect (aspect 4) of the present invention, in any of the complex absorbers of the above aspects 1 to 3, the polymer absorbent is a monolithic absorbent.
本態様4の複合吸収体は、高分子吸収剤がモノリス状の吸収剤であるため、体液を素早く吸収することができる上、一時的に保持した体液をより着実にSAPへ受け渡すことができる。
In the composite absorber of the present aspect 4, since the polymer absorbent is a monolithic absorbent, the body fluid can be quickly absorbed and the temporarily held body fluid can be more steadily transferred to the SAP. ..
本発明の更に別の態様(態様5)では、上記態様1~4のいずれかの複合吸収体において、前記高分子吸収剤は、(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を含有する化合物の架橋重合体の加水分解物であり、且つ、少なくとも1個以上の-COONa基を含有することを特徴とする。
In yet another aspect of the present invention (aspect 5), in any of the composite absorbers of aspects 1 to 4, the polymer absorbent is a (meth) acrylic acid ester and two or more in one molecule. It is a hydrolyzate of a crosslinked polymer of a compound containing a vinyl group, and is characterized by containing at least one -COONa group.
本態様5の複合吸収体は、高分子吸収剤が上記特定の構成を備えていることで、体液を吸収する時に、親水性の連続骨格が伸長しやすく、連続空孔も広がりやすいため、より多くの体液をより素早く連続空孔に取り込むことができ、吸収体として更に高い吸収性能を発揮することができる。
In the composite absorber of the present embodiment 5, since the polymer absorbent has the above-mentioned specific configuration, the hydrophilic continuous skeleton is likely to be elongated and the continuous pores are likely to be expanded when absorbing the body fluid. A large amount of body fluid can be taken into the continuous pores more quickly, and even higher absorption performance can be exhibited as an absorber.
また、本発明の更に別の態様(態様6)は、上記態様1~5のいずれかの複合吸収体を有することを特徴とする衛生用品である。
Further, yet another aspect (aspect 6) of the present invention is a hygienic product characterized by having the complex absorber according to any one of the above aspects 1 to 5.
本態様6の衛生用品は、上述の態様1~5のいずれかの複合吸収体を有しているため、衛生用品として高い吸収性能を発揮することができる。
Since the hygienic product of the sixth aspect has the composite absorber according to any one of the above-mentioned aspects 1 to 5, it can exhibit high absorption performance as a hygienic product.
本発明によれば、吸収性能の高い吸収体を提供することができる。
According to the present invention, it is possible to provide an absorber having high absorption performance.
以下、本発明の複合吸収体の好適な実施形態について、当該複合吸収体が適用される衛生用品の一例である軽失禁パッド1を用いて、詳細に説明する。
なお、本明細書においては、特に断りのない限り、「展開状態で水平面上に置いた対象物(例えば、軽失禁パッド、複合吸収体等)を、垂直方向の上方側(対象物が衛生用品の場合は表面シート側)から対象物の厚さ方向に見ること」を、単に「平面視」という。 Hereinafter, a preferred embodiment of the composite absorber of the present invention will be described in detail using a light incontinence pad 1 which is an example of a hygienic product to which the composite absorber is applied.
In the present specification, unless otherwise specified, "an object placed on a horizontal plane in a deployed state (for example, a light incontinence pad, a composite absorber, etc.) is placed on the upper side in the vertical direction (the object is a sanitary product). In the case of, looking in the thickness direction of the object from the surface sheet side) is simply called "planar view".
なお、本明細書においては、特に断りのない限り、「展開状態で水平面上に置いた対象物(例えば、軽失禁パッド、複合吸収体等)を、垂直方向の上方側(対象物が衛生用品の場合は表面シート側)から対象物の厚さ方向に見ること」を、単に「平面視」という。 Hereinafter, a preferred embodiment of the composite absorber of the present invention will be described in detail using a light incontinence pad 1 which is an example of a hygienic product to which the composite absorber is applied.
In the present specification, unless otherwise specified, "an object placed on a horizontal plane in a deployed state (for example, a light incontinence pad, a composite absorber, etc.) is placed on the upper side in the vertical direction (the object is a sanitary product). In the case of, looking in the thickness direction of the object from the surface sheet side) is simply called "planar view".
なお、本明細書において、「長手方向」は、「平面視における縦長の対象物(例えば、展開状態の軽失禁パッド、複合吸収体等)の長さの長い方向」を指し、「幅方向」は、「平面視における縦長の対象物の長さの短い方向」を指し、「厚さ方向」は、「展開状態で水平面上に置いた対象物に対して垂直方向」を指し、これらの長手方向、幅方向及び厚さ方向は、それぞれ互いに直交する関係にある。
In the present specification, the "longitudinal direction" refers to "the direction in which the length of a vertically long object (for example, a light incontinence pad in a deployed state, a composite absorber, etc.) in a plan view is long" and is "the width direction". Refers to "the short direction of the length of the vertically long object in the plan view", and "the thickness direction" refers to "the direction perpendicular to the object placed on the horizontal plane in the unfolded state", and their longitudinal directions. The direction, width direction, and thickness direction are orthogonal to each other.
また、本明細書では、特に断りのない限り、軽失禁パッド1の厚さ方向において、「軽失禁パッド1の着用時に、着用者の肌面に対して相対的に近位側」を「肌対向面側」といい、「軽失禁パッド1の着用時に、着用者の肌面に対して相対的に遠位側」を「非肌対向面側」という。
Further, in the present specification, unless otherwise specified, "skin is relatively proximal to the wearer's skin surface when the light incontinence pad 1 is worn" in the thickness direction of the light incontinence pad 1. It is referred to as "opposing surface side", and "when the light incontinence pad 1 is worn, the side relatively distal to the wearer's skin surface" is referred to as "non-skin facing surface side".
[軽失禁パッド]
図1は、本発明の一実施形態に係る複合吸収体4が適用された、展開状態の軽失禁パッド1の概略平面図である。
軽失禁パッド1は、図1に示すように、平面視にて、長手方向L及び幅方向Wを有し、且つ2つの長手方向端縁が長手方向外方側に向かって円弧状に突出してなる縦長の外形形状を有している。なお、軽失禁パッド1の外形形状はこのような態様に限定されず、縦長の形状のものであれば、各種用途や使用態様等に応じた任意の形状(例えば、長円形状、矩形状、砂時計形状など)を採用することができる。 [Light incontinence pad]
FIG. 1 is a schematic plan view of a light incontinence pad 1 in a deployed state to which the composite absorber 4 according to the embodiment of the present invention is applied.
As shown in FIG. 1, the light incontinence pad 1 has a longitudinal direction L and a width direction W in a plan view, and two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction. It has a vertically long outer shape. The external shape of the light incontinence pad 1 is not limited to such a mode, and any shape (for example, oval shape, rectangular shape, etc.) according to various uses, usage modes, etc., as long as it is a vertically long shape. Hourglass shape, etc.) can be adopted.
図1は、本発明の一実施形態に係る複合吸収体4が適用された、展開状態の軽失禁パッド1の概略平面図である。
軽失禁パッド1は、図1に示すように、平面視にて、長手方向L及び幅方向Wを有し、且つ2つの長手方向端縁が長手方向外方側に向かって円弧状に突出してなる縦長の外形形状を有している。なお、軽失禁パッド1の外形形状はこのような態様に限定されず、縦長の形状のものであれば、各種用途や使用態様等に応じた任意の形状(例えば、長円形状、矩形状、砂時計形状など)を採用することができる。 [Light incontinence pad]
FIG. 1 is a schematic plan view of a light incontinence pad 1 in a deployed state to which the composite absorber 4 according to the embodiment of the present invention is applied.
As shown in FIG. 1, the light incontinence pad 1 has a longitudinal direction L and a width direction W in a plan view, and two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction. It has a vertically long outer shape. The external shape of the light incontinence pad 1 is not limited to such a mode, and any shape (for example, oval shape, rectangular shape, etc.) according to various uses, usage modes, etc., as long as it is a vertically long shape. Hourglass shape, etc.) can be adopted.
軽失禁パッド1は、厚さ方向において、軽失禁パッド1の肌対向面側の表面を形成する液透過性の表面シート2と、軽失禁パッド1の非肌対向面側の表面を形成する裏面シート3と、これらのシートの間に位置する複合吸収体4とを、基本構成として備えている。
また、軽失禁パッド1においては、裏面シート3の非肌対向面側の表面に配置され、軽失禁パッド1を着用者の下着等の着衣の内面に粘着固定する粘着部(不図示)を更に備えている。 The light incontinence pad 1 has a liquid-permeable surface sheet 2 that forms the surface of the light incontinence pad 1 on the skin-facing surface side and a back surface that forms the surface of the light incontinence pad 1 on the non-skin-facing surface side. Asheet 3 and a composite absorber 4 located between these sheets are provided as a basic configuration.
Further, in the light incontinence pad 1, an adhesive portion (not shown) which is arranged on the surface of theback surface sheet 3 on the non-skin facing surface side and adhesively fixes the light incontinence pad 1 to the inner surface of clothing such as the wearer's underwear is further provided. I have.
また、軽失禁パッド1においては、裏面シート3の非肌対向面側の表面に配置され、軽失禁パッド1を着用者の下着等の着衣の内面に粘着固定する粘着部(不図示)を更に備えている。 The light incontinence pad 1 has a liquid-permeable surface sheet 2 that forms the surface of the light incontinence pad 1 on the skin-facing surface side and a back surface that forms the surface of the light incontinence pad 1 on the non-skin-facing surface side. A
Further, in the light incontinence pad 1, an adhesive portion (not shown) which is arranged on the surface of the
なお、軽失禁パッド1は、このような構成のものに限定されず、例えば、表面シート2よりも肌対向面側の位置において軽失禁パッド1の幅方向Wの両端部に位置し且つ長手方向Lに延在するように配置された、防漏壁形成用の一対のサイドシートと、当該一対のサイドシートの各々において長手方向Lに沿うように配置された複数本の弾性部材と、を備えていてもよい。
The light incontinence pad 1 is not limited to such a configuration, and is, for example, located at both ends of the light incontinence pad 1 in the width direction W at a position on the skin facing surface side of the surface sheet 2 and in the longitudinal direction. A pair of side sheets for forming a leak-proof wall arranged so as to extend to L, and a plurality of elastic members arranged along the longitudinal direction L in each of the pair of side sheets are provided. May be.
そして、軽失禁パッド1において、複合吸収体4は、表面シート2と裏面シート3との間に位置し、着用者から排出されて表面シート2を透過してきた尿などの体液を吸収し得る吸水性部材によって形成されており、かかる複合吸収体4は、親水性の連続骨格及び連続空孔を備えた高分子吸収剤と、高吸収性ポリマー(SAP)とを含んでいる。
さらに、この高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有している。 Then, in the light incontinence pad 1, the composite absorber 4 is located between the front surface sheet 2 and theback surface sheet 3, and can absorb body fluid such as urine that has been discharged from the wearer and has permeated the front surface sheet 2. Formed by a sex member, such composite absorber 4 comprises a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer (SAP).
Further, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more.
さらに、この高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有している。 Then, in the light incontinence pad 1, the composite absorber 4 is located between the front surface sheet 2 and the
Further, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more.
このような高分子吸収剤は、毛細管現象によって体液を連続空孔に取り込むことができる上、上記特定の高い液吐出し量及び液吐出し率を有していることで(すなわち、高い保水能力と優れた水分放出性(離水性)を有していることで)、一度に多量の体液を保持することができるとともに、吸収・保持した体液を多量に放出することができる。
したがって、このような高分子吸収剤を含む複合吸収体4は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。 Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
Therefore, since the composite absorber 4 containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), the water retention capacity of the SAP is fully utilized. It is possible to exhibit high absorption performance as an absorber.
したがって、このような高分子吸収剤を含む複合吸収体4は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。 Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
Therefore, since the composite absorber 4 containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), the water retention capacity of the SAP is fully utilized. It is possible to exhibit high absorption performance as an absorber.
さらに、このような複合吸収体4を備えた軽失禁パッド1もまた、軽失禁パッドとして高い吸収性能を発揮することができる。
Further, the light incontinence pad 1 provided with such a composite absorber 4 can also exhibit high absorption performance as a light incontinence pad.
以下、本発明の複合吸収体が適用される衛生用品の各種構成部材について、上述の軽失禁パッド1を用いて更に詳細に説明する。
Hereinafter, various constituent members of hygiene products to which the composite absorber of the present invention is applied will be described in more detail using the above-mentioned light incontinence pad 1.
(表面シート)
上述の軽失禁パッド1において、表面シート2は、図1に示すように、平面視にて、軽失禁パッド1の長手方向Lの一方側端縁から他方側端縁にわたって延在し、且つ、軽失禁パッド1の幅方向Wの一方側端縁近傍から他方側端縁近傍にわたって延在する、縦長の外形形状を有している。かかる表面シート2は、軽失禁パッド1の厚さ方向において肌対向面側の位置に配置され、着用者の肌に当接し得る接触面、すなわち軽失禁パッド1の肌対向面側の表面を形成する、液透過性のシート状部材によって構成されている。 (Surface sheet)
In the above-mentioned light incontinence pad 1, as shown in FIG. 1, the surface sheet 2 extends from one side edge of the light incontinence pad 1 in the longitudinal direction L to the other side edge in a plan view, and The light incontinence pad 1 has a vertically long outer shape extending from the vicinity of one side edge of the width direction W to the vicinity of the other side edge. The surface sheet 2 is arranged at a position on the skin facing surface side in the thickness direction of the light incontinence pad 1 and forms a contact surface that can come into contact with the wearer's skin, that is, the surface of the light incontinence pad 1 on the skin facing surface side. It is composed of a liquid-permeable sheet-like member.
上述の軽失禁パッド1において、表面シート2は、図1に示すように、平面視にて、軽失禁パッド1の長手方向Lの一方側端縁から他方側端縁にわたって延在し、且つ、軽失禁パッド1の幅方向Wの一方側端縁近傍から他方側端縁近傍にわたって延在する、縦長の外形形状を有している。かかる表面シート2は、軽失禁パッド1の厚さ方向において肌対向面側の位置に配置され、着用者の肌に当接し得る接触面、すなわち軽失禁パッド1の肌対向面側の表面を形成する、液透過性のシート状部材によって構成されている。 (Surface sheet)
In the above-mentioned light incontinence pad 1, as shown in FIG. 1, the surface sheet 2 extends from one side edge of the light incontinence pad 1 in the longitudinal direction L to the other side edge in a plan view, and The light incontinence pad 1 has a vertically long outer shape extending from the vicinity of one side edge of the width direction W to the vicinity of the other side edge. The surface sheet 2 is arranged at a position on the skin facing surface side in the thickness direction of the light incontinence pad 1 and forms a contact surface that can come into contact with the wearer's skin, that is, the surface of the light incontinence pad 1 on the skin facing surface side. It is composed of a liquid-permeable sheet-like member.
また、表面シート2は、図1に示すように、当該表面シート2の非肌対向面側に配置される複合吸収体4に比べて、長手方向L及び幅方向Wにやや大きいサイズを有しており、周縁部において非肌対向面側に位置する裏面シート3と接合されている。
Further, as shown in FIG. 1, the surface sheet 2 has a size slightly larger in the longitudinal direction L and the width direction W than the composite absorber 4 arranged on the non-skin facing surface side of the surface sheet 2. It is joined to the back surface sheet 3 located on the non-skin facing surface side in the peripheral portion.
本発明において、表面シートの外形形状や各種寸法、坪量等は、衛生用品の表面シートとして用い得るものであれば特に制限されず、所望の液透過性や肌触り、柔軟性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。
In the present invention, the outer shape, various dimensions, basis weight, etc. of the surface sheet are not particularly limited as long as they can be used as the surface sheet of sanitary products, depending on desired liquid permeability, touch, flexibility, strength, and the like. Any external shape, various dimensions, basis weight, etc. can be adopted.
(裏面シート)
上述の軽失禁パッド1において裏面シート3は、平面視にて、軽失禁パッド1の長手方向Lの一方側端縁から他方側端縁にわたって延在し、且つ、軽失禁パッド1の幅方向Wの一方側端縁から他方側端縁にわたって延在する、縦長の外形形状を有している。かかる裏面シート3は、軽失禁パッド1の厚さ方向において非肌対向面側の位置に配置されて、軽失禁パッド1の非肌対向面を形成するとともに、複合吸収体4を透過してきた尿などの体液が軽失禁パッド1の外部へ漏出するのを防ぐ、液不透過性のシート状部材によって構成されている。 (Back sheet)
In the above-mentioned light incontinence pad 1, theback surface sheet 3 extends from one side edge of the light incontinence pad 1 in the longitudinal direction L to the other side edge and extends in the width direction W of the light incontinence pad 1 in a plan view. It has a vertically long outer shape extending from one side edge to the other side edge. The back sheet 3 is arranged at a position on the non-skin facing surface side in the thickness direction of the light incontinence pad 1 to form the non-skin facing surface of the light incontinence pad 1 and urine that has permeated the composite absorber 4. It is composed of a liquid-impermeable sheet-like member that prevents body fluids such as those from leaking to the outside of the light incontinence pad 1.
上述の軽失禁パッド1において裏面シート3は、平面視にて、軽失禁パッド1の長手方向Lの一方側端縁から他方側端縁にわたって延在し、且つ、軽失禁パッド1の幅方向Wの一方側端縁から他方側端縁にわたって延在する、縦長の外形形状を有している。かかる裏面シート3は、軽失禁パッド1の厚さ方向において非肌対向面側の位置に配置されて、軽失禁パッド1の非肌対向面を形成するとともに、複合吸収体4を透過してきた尿などの体液が軽失禁パッド1の外部へ漏出するのを防ぐ、液不透過性のシート状部材によって構成されている。 (Back sheet)
In the above-mentioned light incontinence pad 1, the
本発明において、裏面シートの外形形状や各種寸法、坪量等は、衛生用品の裏面シートとして用い得るものであれば特に制限されず、所望の防漏性能や通気性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。
In the present invention, the outer shape, various dimensions, basis weight, etc. of the back sheet are not particularly limited as long as they can be used as the back sheet of sanitary goods, and are arbitrary according to desired leakage-proof performance, breathability, strength, and the like. It is possible to adopt the external shape, various dimensions, basis weight, etc.
(複合吸収体)
上述の軽失禁パッド1において複合吸収体4は、図1に示すように、平面視にて、軽失禁パッド1の長手方向L及び幅方向Wの中央部を中心にして、長手方向Lの一方側端縁近傍から他方側端縁近傍にわたる長手方向Lの広範囲の領域に延在するとともに、幅方向Wにおいても、当該幅方向Wの一方側端縁近傍から他方側端縁近傍にわたる広範囲の領域に延在しており、さらに2つの長手方向端縁が長手方向外方側に向かって円弧状に突出してなる、縦長の外形形状を有している。 (Composite absorber)
In the above-mentioned light incontinence pad 1, as shown in FIG. 1, the composite absorber 4 is one of the longitudinal directions L centered on the central portion of the light incontinence pad 1 in the longitudinal direction L and the width direction W in a plan view. It extends over a wide area in the longitudinal direction L from the vicinity of the side edge to the vicinity of the other side edge, and also in the width direction W, a wide area from the vicinity of one side edge of the width direction W to the vicinity of the other side edge. Further, it has a vertically long outer shape in which two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction.
上述の軽失禁パッド1において複合吸収体4は、図1に示すように、平面視にて、軽失禁パッド1の長手方向L及び幅方向Wの中央部を中心にして、長手方向Lの一方側端縁近傍から他方側端縁近傍にわたる長手方向Lの広範囲の領域に延在するとともに、幅方向Wにおいても、当該幅方向Wの一方側端縁近傍から他方側端縁近傍にわたる広範囲の領域に延在しており、さらに2つの長手方向端縁が長手方向外方側に向かって円弧状に突出してなる、縦長の外形形状を有している。 (Composite absorber)
In the above-mentioned light incontinence pad 1, as shown in FIG. 1, the composite absorber 4 is one of the longitudinal directions L centered on the central portion of the light incontinence pad 1 in the longitudinal direction L and the width direction W in a plan view. It extends over a wide area in the longitudinal direction L from the vicinity of the side edge to the vicinity of the other side edge, and also in the width direction W, a wide area from the vicinity of one side edge of the width direction W to the vicinity of the other side edge. Further, it has a vertically long outer shape in which two longitudinal end edges project in an arc shape toward the outward side in the longitudinal direction.
より具体的には、複合吸収体4は、平面視にて長手方向中央部に、他の部分と比べて幅方向長さが相対的に小さい括れ部を有しており、さらに、この括れ部において複合吸収体4の最小幅を有する最小幅部と、上記括れ部の長手方向外方側において複合吸収体4の最大幅を有する最大幅部とを有している。
More specifically, the composite absorber 4 has a constricted portion in the central portion in the longitudinal direction in a plan view, which is relatively smaller in width direction than the other portions, and further, the constricted portion. It has a minimum width portion having a minimum width of the composite absorber 4 and a maximum width portion having a maximum width of the composite absorber 4 on the outer side in the longitudinal direction of the constricted portion.
複合吸収体4は、軽失禁パッド1の厚さ方向において表面シート2と裏面シート3との間に配置されて、表面シート2を透過してきた尿などの体液を吸収して保持し得る、所定の吸水性部材によって形成され、かかる吸水性部材は、後述する高分子吸収剤や親水性繊維、高吸収性ポリマー等の吸水性材料と、それを保持するティッシュ等のシートと、によって構成されている。すなわち、複合吸収体は、体液を吸収して保持し得る吸水性材料と、それを保持するシートによって構成される吸水性部材を意味する。
The composite absorber 4 is arranged between the front surface sheet 2 and the back surface sheet 3 in the thickness direction of the light incontinence pad 1, and can absorb and retain body fluid such as urine that has permeated the front surface sheet 2. The water-absorbent member is formed of a water-absorbent material such as a polymer absorbent, a hydrophilic fiber, and a highly absorbent polymer, which will be described later, and a sheet such as a tissue holding the water-absorbent material. There is. That is, the composite absorber means a water-absorbent member composed of a water-absorbent material capable of absorbing and holding a body fluid and a sheet holding the water-absorbent material.
なお、軽失禁パッド1においては、複合吸収体4は、表面シート2及び裏面シート3の各々と、ホットメルト型接着剤等の任意の接着剤によって接合されている。
In the light incontinence pad 1, the composite absorber 4 is bonded to each of the front surface sheet 2 and the back surface sheet 3 with an arbitrary adhesive such as a hot melt type adhesive.
そして、複合吸収体4は、上述のとおり親水性の連続骨格及び連続空孔を備えた、特定の液吐出し性を有する高分子吸収剤と、高吸収性ポリマーとを含んでいる。高分子吸収剤については後述するが、高吸収性ポリマーは、当分野において公知のアクリル酸ナトリウムコポリマー等の高吸収性ポリマーからなる粉状物又は粒状物であり、SAP(Super Absorbent Polymer)と称されるものである。
Then, the composite absorber 4 contains a polymer absorbent having a specific liquid ejection property having a hydrophilic continuous skeleton and continuous pores as described above, and a highly absorbent polymer. The polymer absorbent will be described later, but the superabsorbent polymer is a powder or granule made of a superabsorbent polymer such as a sodium acrylate copolymer known in the art, and is referred to as SAP (Super Absorbent Polymer). Is to be done.
なお、複合吸収体4は、吸水性材料として上述の高分子吸収剤及び高吸収性ポリマーのみを含むものであっても、これらのほかに、当分野において公知の吸水性材料を更に含むものであってもよい。そのような吸水性材料としては、例えば、親水性繊維などが挙げられ、更に具体的には、パルプ繊維(例えば、粉砕パルプ等)、コットン、レーヨン、アセテート等のセルロース系繊維などが挙げられる。
Although the composite absorbent 4 contains only the above-mentioned polymer absorbent and highly absorbent polymer as the water-absorbent material, it further contains a water-absorbent material known in the art. There may be. Examples of such a water-absorbent material include hydrophilic fibers, and more specifically, pulp fibers (for example, crushed pulp and the like), cellulosic fibers such as cotton, rayon, and acetate.
また、複合吸収体4は、このような高分子吸収剤、高吸収性ポリマー及び任意の吸水性材料が親水性を有するティッシュ等のラップシートによって覆われた構成を有している。
Further, the composite absorber 4 has a structure in which such a polymer absorbent, a highly absorbent polymer, and any water-absorbent material are covered with a wrap sheet such as a tissue having hydrophilicity.
本発明において、複合吸収体の外形形状や各種寸法、坪量等は、本発明の効果を阻害しない限り特に制限されず、所望の吸水性や柔軟性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。
In the present invention, the outer shape, various dimensions, basis weight, etc. of the composite absorber are not particularly limited as long as the effects of the present invention are not impaired, and any outer shape according to desired water absorption, flexibility, strength, etc. Various dimensions, basis weight, etc. can be adopted.
以下、本発明の複合吸収体に用いられる高分子吸収剤について、更に詳細に説明する。
Hereinafter, the polymer absorbent used in the composite absorber of the present invention will be described in more detail.
[高分子吸収剤]
高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有するものであれば特に限定されず、例えば、少なくとも(メタ)アクリル酸エステルを含む2個以上のモノマーの架橋重合体の加水分解物であり、官能基に少なくとも1個以上の親水基を有する高分子化合物が挙げられる。より具体的には、(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を含有する化合物の架橋重合体の加水分解物であり、少なくとも-COONa基を有する高分子化合物が挙げられる。かかる高分子吸収剤は、一分子中に少なくとも1個以上の-COONa基を有する有機多孔質体であり、さらに、-COOH基を有していてもよい。多孔質体の骨格中には、-COONa基が略均一に分布している。 [Polymer absorbent]
The polymer absorbent is not particularly limited as long as it has a specific liquid discharge property such that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more. For example, a polymer compound which is a hydrolyzate of a crosslinked polymer of two or more monomers containing at least (meth) acrylic acid ester and has at least one hydrophilic group as a functional group can be mentioned. More specifically, a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and a polymer compound having at least -COONa group is mentioned. Be done. Such a polymer absorbent is an organic porous body having at least one -COONa group in one molecule, and may further have a -COOH group. -COONa groups are distributed substantially uniformly in the skeleton of the porous body.
高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有するものであれば特に限定されず、例えば、少なくとも(メタ)アクリル酸エステルを含む2個以上のモノマーの架橋重合体の加水分解物であり、官能基に少なくとも1個以上の親水基を有する高分子化合物が挙げられる。より具体的には、(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を含有する化合物の架橋重合体の加水分解物であり、少なくとも-COONa基を有する高分子化合物が挙げられる。かかる高分子吸収剤は、一分子中に少なくとも1個以上の-COONa基を有する有機多孔質体であり、さらに、-COOH基を有していてもよい。多孔質体の骨格中には、-COONa基が略均一に分布している。 [Polymer absorbent]
The polymer absorbent is not particularly limited as long as it has a specific liquid discharge property such that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more. For example, a polymer compound which is a hydrolyzate of a crosslinked polymer of two or more monomers containing at least (meth) acrylic acid ester and has at least one hydrophilic group as a functional group can be mentioned. More specifically, a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and a polymer compound having at least -COONa group is mentioned. Be done. Such a polymer absorbent is an organic porous body having at least one -COONa group in one molecule, and may further have a -COOH group. -COONa groups are distributed substantially uniformly in the skeleton of the porous body.
高分子吸収剤がこのような(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を含有する化合物の架橋重合体の加水分解物であり、且つ、少なくとも1個以上の-COONa基を含有するものであると、後述するように、尿などの体液を吸収する時に親水性の連続骨格が伸長しやすくなり、連続空孔も広がりやすくなるため、より多くの体液をより素早く連続空孔に取り込むことができ、吸収体として更に高い吸収性能を発揮することができる。
The polymer absorbent is a hydrolyzate of such a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and at least one -COONa. If it contains a group, as will be described later, when absorbing body fluids such as urine, the hydrophilic continuous skeleton tends to elongate and the continuous pores also tend to expand, so that more body fluids can be continuously expanded more quickly. It can be taken into the pores and can exhibit even higher absorption performance as an absorber.
なお、本明細書において(メタ)アクリル酸エステルとは、アクリル酸エステル又はメタクリル酸エステルをいう。
In the present specification, the (meth) acrylic acid ester means an acrylic acid ester or a methacrylic acid ester.
このような(メタ)アクリル酸エステルと、ジビニルベンゼンとの架橋重合体の加水分解物によって形成される高分子吸収剤においては、少なくとも-COONa基を有する有機ポリマーによって親水性の連続骨格が形成され、骨格間に吸収対象液(すなわち、尿などの体液)の吸収場となる連通孔(連続空孔)を有している。
なお、加水分解処理は、架橋重合体の-COOR基(すなわち、カルボン酸エステル基)を-COONa基又は-COOH基にするものであるため(図2を参照)、高分子吸収剤は、-COOR基を有していてもよい。 In a polymer absorbent formed by a hydrolyzate of a crosslinked polymer of such a (meth) acrylic acid ester and divinylbenzene, a hydrophilic continuous skeleton is formed by an organic polymer having at least a -COONa group. , It has a communication hole (continuous pore) that serves as an absorption field for the liquid to be absorbed (that is, body fluid such as urine) between the skeletons.
Since the hydrolysis treatment changes the -COOR group (that is, the carboxylic acid ester group) of the crosslinked polymer to a -COONa group or a -COOH group (see FIG. 2), the polymer absorbent is-. It may have a COOR group.
なお、加水分解処理は、架橋重合体の-COOR基(すなわち、カルボン酸エステル基)を-COONa基又は-COOH基にするものであるため(図2を参照)、高分子吸収剤は、-COOR基を有していてもよい。 In a polymer absorbent formed by a hydrolyzate of a crosslinked polymer of such a (meth) acrylic acid ester and divinylbenzene, a hydrophilic continuous skeleton is formed by an organic polymer having at least a -COONa group. , It has a communication hole (continuous pore) that serves as an absorption field for the liquid to be absorbed (that is, body fluid such as urine) between the skeletons.
Since the hydrolysis treatment changes the -COOR group (that is, the carboxylic acid ester group) of the crosslinked polymer to a -COONa group or a -COOH group (see FIG. 2), the polymer absorbent is-. It may have a COOR group.
親水性の連続骨格を形成する有機ポリマー中の-COOH基及び-COONa基の存在は、赤外分光光度法及び弱酸性イオン交換基の定量法で分析することにより確認することができる。
The presence of -COOH group and -COONa group in the organic polymer forming a hydrophilic continuous skeleton can be confirmed by analysis by infrared spectrophotometric method and quantification method of weakly acidic ion exchange group.
ここで、図2は、高分子吸収剤の一例である吸収剤Aの製造過程について説明する図である。この図2において、上図は、重合の構成原料を示し、中図は、(メタ)アクリル酸エステルとジビニルベンゼンとの架橋重合体であるモノリスAを示し、下図は、中図のモノリスAに加水分解及び乾燥処理をして得られる吸収剤Aを示している。
Here, FIG. 2 is a diagram illustrating a manufacturing process of the absorbent A, which is an example of the polymer absorbent. In FIG. 2, the upper figure shows the constituent raw materials for the polymerization, the middle figure shows the monolith A which is a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene, and the lower figure shows the monolith A in the middle figure. The absorbent A obtained by hydrolysis and drying treatment is shown.
以下、高分子吸収剤の一例である、(メタ)アクリル酸エステルと、ジビニルベンゼンとの架橋重合体の加水分解物によって形成される吸収剤Aを用いて説明する。
Hereinafter, an absorbent A formed by a hydrolyzate of a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene, which is an example of a polymer absorbent, will be described.
なお、高分子吸収剤としては、このような吸収剤Aに限られず、(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を有する化合物の架橋重合体の加水分解物、或いは、少なくとも(メタ)アクリル酸エステルを含む2種類以上のモノマーの架橋重合体の加水分解物などであってもよい。
The polymer absorbent is not limited to such a absorbent A, but is a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound having two or more vinyl groups in one molecule, or , It may be a hydrolyzate of a crosslinked polymer of two or more kinds of monomers containing at least (meth) acrylic acid ester.
なお、以下の説明において、「モノリスA」とは、加水分解処理がなされる前の(メタ)アクリル酸エステルとジビニルベンゼンとの架橋重合体からなる有機多孔質体であり、「モノリス状有機多孔質体」と称することがある。
また、「吸収剤A」は、加水分解処理及び乾燥処理がなされた後の(メタ)アクリル酸エステルとジビニルベンゼンとの架橋重合体(モノリスA)の加水分解物である。なお、以下の説明において、吸収剤Aは乾燥状態のものをいう。 In the following description, "monolith A" is an organic porous body composed of a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene before hydrolysis treatment, and is "monolithic organic porous". Sometimes referred to as "polymer".
Further, the "absorbent A" is a hydrolyzate of a crosslinked polymer (monolith A) of (meth) acrylic acid ester and divinylbenzene after being hydrolyzed and dried. In the following description, the absorbent A is in a dry state.
また、「吸収剤A」は、加水分解処理及び乾燥処理がなされた後の(メタ)アクリル酸エステルとジビニルベンゼンとの架橋重合体(モノリスA)の加水分解物である。なお、以下の説明において、吸収剤Aは乾燥状態のものをいう。 In the following description, "monolith A" is an organic porous body composed of a crosslinked polymer of (meth) acrylic acid ester and divinylbenzene before hydrolysis treatment, and is "monolithic organic porous". Sometimes referred to as "polymer".
Further, the "absorbent A" is a hydrolyzate of a crosslinked polymer (monolith A) of (meth) acrylic acid ester and divinylbenzene after being hydrolyzed and dried. In the following description, the absorbent A is in a dry state.
まず、吸収剤Aの構造について説明する。
吸収剤Aは、上述のとおり親水性の連続骨格と連続空孔を有している。親水性の連続骨格を有する有機ポリマーである吸収剤Aは、図2に示すように、重合モノマーである(メタ)アクリル酸エステルと、架橋モノマーであるジビニルベンゼンとを架橋重合し、得られた架橋重合体(モノリスA)を更に加水分解することにより得られる。 First, the structure of the absorbent A will be described.
The absorbent A has a hydrophilic continuous skeleton and continuous pores as described above. As shown in FIG. 2, the absorbent A, which is an organic polymer having a hydrophilic continuous skeleton, was obtained by cross-linking and polymerizing a (meth) acrylic acid ester as a polymerization monomer and divinylbenzene as a cross-linking monomer. It is obtained by further hydrolyzing the crosslinked polymer (Monolith A).
吸収剤Aは、上述のとおり親水性の連続骨格と連続空孔を有している。親水性の連続骨格を有する有機ポリマーである吸収剤Aは、図2に示すように、重合モノマーである(メタ)アクリル酸エステルと、架橋モノマーであるジビニルベンゼンとを架橋重合し、得られた架橋重合体(モノリスA)を更に加水分解することにより得られる。 First, the structure of the absorbent A will be described.
The absorbent A has a hydrophilic continuous skeleton and continuous pores as described above. As shown in FIG. 2, the absorbent A, which is an organic polymer having a hydrophilic continuous skeleton, was obtained by cross-linking and polymerizing a (meth) acrylic acid ester as a polymerization monomer and divinylbenzene as a cross-linking monomer. It is obtained by further hydrolyzing the crosslinked polymer (Monolith A).
親水性の連続骨格を形成する有機ポリマーは、構成単位として、エチレン基の重合残基(以下、「構成単位X」と称する。)と、ジビニルベンゼンの架橋重合残基(以下、「構成単位Y」と称する。)と、を有する。
さらに、親水性の連続骨格を形成する有機ポリマー中のエチレン基の重合残基(構成単位X)は、カルボン酸エステル基の加水分解により生成する-COONa基、又は-COOH基と-COONa基の両方の基を有する。なお、重合モノマーが(メタ)アクリル酸エステルである場合、エチレン基の重合残基(構成単位X)は、-COONa基、-COOH基及びエステル基を有する。 The organic polymer forming a hydrophilic continuous skeleton has an ethylene group polymerization residue (hereinafter referred to as “constituent unit X”) and a crosslinked polymerization residue of divinylbenzene (hereinafter referred to as “constituent unit Y”) as constituent units. ”) And.
Furthermore, the polymerization residue (constituent unit X) of the ethylene group in the organic polymer forming the hydrophilic continuous skeleton is the -COONa group or -COOH group and -COONa group generated by hydrolysis of the carboxylic acid ester group. It has both groups. When the polymerization monomer is a (meth) acrylic acid ester, the polymerization residue (constituent unit X) of the ethylene group has an —COONa group, a —COOH group and an ester group.
さらに、親水性の連続骨格を形成する有機ポリマー中のエチレン基の重合残基(構成単位X)は、カルボン酸エステル基の加水分解により生成する-COONa基、又は-COOH基と-COONa基の両方の基を有する。なお、重合モノマーが(メタ)アクリル酸エステルである場合、エチレン基の重合残基(構成単位X)は、-COONa基、-COOH基及びエステル基を有する。 The organic polymer forming a hydrophilic continuous skeleton has an ethylene group polymerization residue (hereinafter referred to as “constituent unit X”) and a crosslinked polymerization residue of divinylbenzene (hereinafter referred to as “constituent unit Y”) as constituent units. ”) And.
Furthermore, the polymerization residue (constituent unit X) of the ethylene group in the organic polymer forming the hydrophilic continuous skeleton is the -COONa group or -COOH group and -COONa group generated by hydrolysis of the carboxylic acid ester group. It has both groups. When the polymerization monomer is a (meth) acrylic acid ester, the polymerization residue (constituent unit X) of the ethylene group has an —COONa group, a —COOH group and an ester group.
吸収剤Aにおいて、親水性の連続骨格を形成する有機ポリマー中の、ジビニルベンゼンの架橋重合残基(構成単位Y)の割合は、全構成単位に対し、例えば0.1~30モル%であり、好ましくは0.1~20モル%である。メタクリル酸ブチルを重合モノマーとし、ジビニルベンゼンを架橋モノマーとした吸収剤Aにおいては、親水性の連続骨格を形成する有機ポリマー中の、ジビニルベンゼンの架橋重合残基(構成単位Y)の割合は、全構成単位に対し、例えば約3%であり、好ましくは0.1~10モル%であり、より好ましくは0.3~8モル%である。
なお、親水性の連続骨格を形成する有機ポリマー中のジビニルベンゼンの架橋重合残基の割合が0.1モル%以上であると、吸収剤Aの強度が低下しにくくなり、また、このジビニルベンゼンの架橋重合残基の割合が30モル%以下であると、吸収対象液の吸収量が低下しにくくなる。 In the absorbent A, the ratio of the crosslinked polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is, for example, 0.1 to 30 mol% with respect to all the constituent units. , Preferably 0.1 to 20 mol%. In the absorbent A using butyl methacrylate as a polymerization monomer and divinylbenzene as a cross-linking monomer, the ratio of the cross-linking polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming a hydrophilic continuous skeleton is It is, for example, about 3%, preferably 0.1 to 10 mol%, and more preferably 0.3 to 8 mol% with respect to all the constituent units.
When the ratio of the crosslinked polymerization residue of the divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is 0.1 mol% or more, the strength of the absorbent A is less likely to decrease, and the divinylbenzene is also difficult to decrease. When the ratio of the crosslinked polymerization residue of the above is 30 mol% or less, the absorption amount of the liquid to be absorbed is less likely to decrease.
なお、親水性の連続骨格を形成する有機ポリマー中のジビニルベンゼンの架橋重合残基の割合が0.1モル%以上であると、吸収剤Aの強度が低下しにくくなり、また、このジビニルベンゼンの架橋重合残基の割合が30モル%以下であると、吸収対象液の吸収量が低下しにくくなる。 In the absorbent A, the ratio of the crosslinked polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is, for example, 0.1 to 30 mol% with respect to all the constituent units. , Preferably 0.1 to 20 mol%. In the absorbent A using butyl methacrylate as a polymerization monomer and divinylbenzene as a cross-linking monomer, the ratio of the cross-linking polymerization residue (constituent unit Y) of divinylbenzene in the organic polymer forming a hydrophilic continuous skeleton is It is, for example, about 3%, preferably 0.1 to 10 mol%, and more preferably 0.3 to 8 mol% with respect to all the constituent units.
When the ratio of the crosslinked polymerization residue of the divinylbenzene in the organic polymer forming the hydrophilic continuous skeleton is 0.1 mol% or more, the strength of the absorbent A is less likely to decrease, and the divinylbenzene is also difficult to decrease. When the ratio of the crosslinked polymerization residue of the above is 30 mol% or less, the absorption amount of the liquid to be absorbed is less likely to decrease.
また、吸収剤Aにおいて、親水性の連続骨格を形成する有機ポリマーは、構成単位X及び構成単位Yのみからなるものであってもよいし、或いは、構成単位X及び構成単位Yに加えて、構成単位X及び構成単位Y以外の構成単位、すなわち(メタ)アクリル酸エステル及びジビニルベンゼン以外のモノマーの重合残基を有していてもよい。
Further, in the absorbent A, the organic polymer forming the hydrophilic continuous skeleton may be composed of only the constituent unit X and the constituent unit Y, or in addition to the constituent unit X and the constituent unit Y, It may have a structural unit other than the structural unit X and the structural unit Y, that is, a polymerization residue of a monomer other than the (meth) acrylic acid ester and divinylbenzene.
構成単位X及び構成単位Y以外の構成単位としては、例えば、スチレン、α-メチルスチレン、ビニルトルエン、ビニルベンジルクロライド、(メタ)アクリル酸グリシジル、イソブテン、ブタジエン、イソプレン、クロロプレン、塩化ビニル、臭化ビニル、塩化ビニリデン、テトラフルオロエチレン、(メタ)アクリロニトリル、酢酸ビニル、エチレングリコールジ(メタ)アクリレート、トリプロピレングリコールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレートなどのモノマーの重合残基が挙げられる。
Examples of the constituent units other than the constituent unit X and the constituent unit Y include styrene, α-methylstyrene, vinyltoluene, vinylbenzyl chloride, glycidyl (meth) acrylate, isobutene, butadiene, isoprene, chloroprene, vinyl chloride, and bromide. Polymerization residues of monomers such as vinyl, vinylidene chloride, tetrafluoroethylene, (meth) acrylonitrile, vinyl acetate, ethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, trimethylolpropanetri (meth) acrylate Can be mentioned.
なお、親水性の連続骨格を形成する有機ポリマー中の、構成単位X及び構成単位Y以外の構成単位の割合は、全構成単位に対し、例えば0~50モル%であり、好ましくは0~30モル%である。
The ratio of the structural units other than the structural unit X and the structural unit Y in the organic polymer forming the hydrophilic continuous skeleton is, for example, 0 to 50 mol%, preferably 0 to 30 with respect to all the structural units. It is mol%.
また、吸収剤Aは、親水性の連続骨格の厚みが0.1~100μmであることが好ましい。吸収剤Aの親水性の連続骨格の厚みが0.1μm以上であると、多孔質体における吸収対象液(体液)を取り込むための空間(空孔)が吸収時に潰れにくくなり、吸収量が低下しにくくなる。一方、親水性の連続骨格の厚みが100μm以下であると、優れた吸収速度が得られやすくなる。
Further, the absorbent A preferably has a hydrophilic continuous skeleton having a thickness of 0.1 to 100 μm. When the thickness of the hydrophilic continuous skeleton of the absorbent A is 0.1 μm or more, the space (pores) for taking in the absorption target liquid (body fluid) in the porous body is less likely to be crushed during absorption, and the absorption amount is reduced. It becomes difficult to do. On the other hand, when the thickness of the hydrophilic continuous skeleton is 100 μm or less, an excellent absorption rate can be easily obtained.
なお、吸収剤Aの親水性の連続骨格の細孔構造は、連続気泡構造であるため、連続骨格の厚みの測定は、電子顕微鏡測定用の試験片に現れる骨格断面を厚みの評価箇所とする。連続骨格は、加水分解後の脱水・乾燥処理で取り除かれる水(水滴)同士の間隔で形成されるため、多角形の形状であることが多い。そのため、連続骨格の厚みは、多角形断面に外接する円の直径(μm)の平均値とする。また、稀に多角形の中に小さな穴が開いている場合もあるが、その場合は、小さな穴を囲んでいる多角形の断面の外接円を測定する。
Since the pore structure of the hydrophilic continuous skeleton of the absorbent A is an open cell structure, the thickness of the continuous skeleton is measured by using the skeleton cross section appearing on the test piece for electron microscope measurement as the evaluation point of the thickness. .. The continuous skeleton is often formed in a polygonal shape because it is formed at intervals between water (water droplets) that are removed by dehydration / drying treatment after hydrolysis. Therefore, the thickness of the continuous skeleton is the average value of the diameters (μm) of the circles circumscribing the polygonal cross section. Also, in rare cases, there may be a small hole in the polygon, in which case the circumscribed circle of the cross section of the polygon surrounding the small hole is measured.
さらに、吸収剤Aは、連続空孔の平均直径が1~1000μmであることが好ましい。吸収剤Aの連続空孔の平均直径が1μm以上であると、多孔質体の吸収対象液(体液)を取り込むための空間(空孔)が吸収時に潰れにくくなり、吸収速度が低下しにくくなる。一方、連続空孔の平均直径が1000μm以下であると、優れた吸収速度が得られやすくなる。
Further, the absorbent A preferably has an average diameter of continuous pores of 1 to 1000 μm. When the average diameter of the continuous pores of the absorbent A is 1 μm or more, the space (pores) for taking in the absorption target liquid (body fluid) of the porous body is less likely to be crushed during absorption, and the absorption rate is less likely to decrease. .. On the other hand, when the average diameter of the continuous pores is 1000 μm or less, an excellent absorption rate can be easily obtained.
なお、吸収剤Aの連続空孔の平均直径(μm)は、水銀圧入法によって測定することができ、かかる水銀圧入法によって得られた細孔分布曲線の最大値を採用する。連続空孔の平均直径の測定用試料については、吸収剤Aのイオン形によらず、50℃の温度に設定した減圧乾燥器で18時間以上乾燥させたものを試料として用いる。なお、最終到達圧力は0Torrとする。
The average diameter (μm) of the continuous pores of the absorbent A can be measured by the mercury intrusion method, and the maximum value of the pore distribution curve obtained by the mercury intrusion method is adopted. As the sample for measuring the average diameter of the continuous pores, a sample dried for 18 hours or more in a vacuum dryer set at a temperature of 50 ° C. is used regardless of the ionic form of the absorbent A. The final ultimate pressure is 0 Torr.
ここで、図3は、吸収剤Aの拡大倍率50倍のSEM写真であり、図4は、吸収剤Aの拡大倍率100倍のSEM写真であり、図5は、吸収剤Aの拡大倍率500倍のSEM写真であり、図6は、吸収剤Aの拡大倍率1000倍のSEM写真であり、さらに、図7は、吸収剤Aの拡大倍率1500倍のSEM写真である。
これら図3~図7に示す吸収剤Aは、メタクリル酸ブチルを重合モノマーとし、ジビニルベンゼンを架橋モノマーとする吸収剤の一例であり、それぞれ2mm角の立方体の構造を有している。 Here, FIG. 3 is an SEM photograph having a magnification of 50 times for the absorbent A, FIG. 4 is an SEM photograph having a magnification of 100 times for the absorbent A, and FIG. 5 is an SEM photograph having a magnification of 500 for the absorbent A. It is a double SEM photograph, FIG. 6 is an SEM photograph having a magnification of 1000 times for the absorbent A, and FIG. 7 is an SEM photograph having a magnification of 1500 times for the absorbent A.
The absorbent A shown in FIGS. 3 to 7 is an example of an absorbent having butyl methacrylate as a polymerization monomer and divinylbenzene as a cross-linking monomer, and each has a cubic structure of 2 mm square.
これら図3~図7に示す吸収剤Aは、メタクリル酸ブチルを重合モノマーとし、ジビニルベンゼンを架橋モノマーとする吸収剤の一例であり、それぞれ2mm角の立方体の構造を有している。 Here, FIG. 3 is an SEM photograph having a magnification of 50 times for the absorbent A, FIG. 4 is an SEM photograph having a magnification of 100 times for the absorbent A, and FIG. 5 is an SEM photograph having a magnification of 500 for the absorbent A. It is a double SEM photograph, FIG. 6 is an SEM photograph having a magnification of 1000 times for the absorbent A, and FIG. 7 is an SEM photograph having a magnification of 1500 times for the absorbent A.
The absorbent A shown in FIGS. 3 to 7 is an example of an absorbent having butyl methacrylate as a polymerization monomer and divinylbenzene as a cross-linking monomer, and each has a cubic structure of 2 mm square.
図3~図7に示す吸収剤Aは、多数の気泡状のマクロポアを有しており、さらに、これら気泡状のマクロポア同士が重なる部分を有している。吸収剤Aは、このマクロポア同士が重なる部分が共通の開口(メソポア)となる連続気泡構造を有している、すなわち、連続気泡構造体(連続マクロポア構造体)となっている。
The absorbent A shown in FIGS. 3 to 7 has a large number of bubble-shaped macropores, and further has a portion where these bubble-shaped macropores overlap each other. The absorbent A has an open cell structure in which the overlapping portions of the macropores have a common opening (mesopore), that is, an open cell structure (continuous macropore structure).
このマクロポア同士が重なる部分は、乾燥状態の平均直径が1~1000μm、好ましくは10~200μm、特に好ましくは20~100μmである共通の開口(メソポア)となっており、その大部分がオープンポア構造となっている。メソポアの乾燥状態の平均直径が1μm以上であると、吸収対象液の吸収速度がより良好なものとなる。一方、メソポアの乾燥状態の平均直径が1000μm以下であると、吸収剤Aが脆化しにくくなる。
なお、このようなマクロポア同士の重なりは、1個のマクロポアで1~12個程度、多くのものは3~10個程度である。 The portion where the macropores overlap each other has a common opening (mesopore) having an average diameter of 1 to 1000 μm, preferably 10 to 200 μm, particularly preferably 20 to 100 μm in a dry state, and most of them have an open pore structure. It has become. When the average diameter of the mesopore in a dry state is 1 μm or more, the absorption rate of the liquid to be absorbed becomes better. On the other hand, when the average diameter of the mesopore in a dry state is 1000 μm or less, the absorbent A is less likely to become brittle.
It should be noted that the number of such macropores overlapped with each other is about 1 to 12 for one macropore, and about 3 to 10 for most macropores.
なお、このようなマクロポア同士の重なりは、1個のマクロポアで1~12個程度、多くのものは3~10個程度である。 The portion where the macropores overlap each other has a common opening (mesopore) having an average diameter of 1 to 1000 μm, preferably 10 to 200 μm, particularly preferably 20 to 100 μm in a dry state, and most of them have an open pore structure. It has become. When the average diameter of the mesopore in a dry state is 1 μm or more, the absorption rate of the liquid to be absorbed becomes better. On the other hand, when the average diameter of the mesopore in a dry state is 1000 μm or less, the absorbent A is less likely to become brittle.
It should be noted that the number of such macropores overlapped with each other is about 1 to 12 for one macropore, and about 3 to 10 for most macropores.
また、吸収剤Aがこのような連続気泡構造を有することにより、マクロポア群やメソポア群を均一に形成することができるとともに、特開平8-252579号公報などに記載されているような粒子凝集型多孔質体に比べて、細孔容積や比表面積を格段に大きくすることができるという利点がある。
Further, since the absorbent A has such an open cell structure, the macropore group and the mesopore group can be uniformly formed, and the particle aggregation type as described in Japanese Patent Application Laid-Open No. 8-252579 etc. can be formed uniformly. Compared to the porous body, there is an advantage that the pore volume and the specific surface area can be significantly increased.
なお、吸収剤Aの細孔(空孔)の全細孔容積は、0.5~50mL/gが好ましく、2~30mL/gがより好ましい。吸収剤Aの全細孔容積が0.5mL/g以上であると、多孔質体の吸収対象液(体液)を取り込むための空間(空孔)が吸収時に潰れにくくなり、吸収量及び吸収速度が低下しにくくなる。一方、吸収剤Aの全細孔容積が50mL/g以下であると、吸収剤Aの強度が低下しにくくなる。
The total pore volume of the pores (pores) of the absorbent A is preferably 0.5 to 50 mL / g, more preferably 2 to 30 mL / g. When the total pore volume of the absorbent A is 0.5 mL / g or more, the space (pores) for taking in the absorption target liquid (body fluid) of the porous body is less likely to be crushed during absorption, and the absorption amount and absorption rate Is less likely to decrease. On the other hand, when the total pore volume of the absorbent A is 50 mL / g or less, the strength of the absorbent A is less likely to decrease.
なお、全細孔容積は、水銀圧入法で測定することができる。全細孔容積の測定用試料は、吸収剤Aのイオン形によらず、50℃の温度に設定した減圧乾燥器で18時間以上乾燥させたものを用いる。なお、最終到達圧力は0Torrとする。
The total pore volume can be measured by the mercury intrusion method. As the sample for measuring the total pore volume, a sample dried for 18 hours or more in a vacuum dryer set at a temperature of 50 ° C. is used regardless of the ionic form of the absorbent A. The final ultimate pressure is 0 Torr.
以下、吸収剤Aと体液等の液体(以下、単に「体液」と称する。)が接触した場合の様子について説明するが、吸収剤Aを含む複合吸収体4と体液が接触した場合についても同様である。また、吸収された体液の質量は、体液量に略比例するため、以下の説明においては、体液の質量を単に「体液量」と称することがある。
Hereinafter, the state of contact between the absorbent A and a liquid such as a body fluid (hereinafter, simply referred to as “body fluid”) will be described, but the same applies to the case where the composite absorber 4 containing the absorbent A and the body fluid come into contact with each other. Is. Further, since the mass of the absorbed body fluid is substantially proportional to the amount of the body fluid, the mass of the body fluid may be simply referred to as "the amount of the body fluid" in the following description.
まず、図3~図7に示す吸収剤Aが備える連続空孔は、複数の細孔(空孔)が互いに連通している空孔であり、外観からも空孔が多数設けられていることを肉眼で視認することができる。体液がこのような多数の空孔を備えた吸収剤Aに接触すると、毛細管現象によって、一定量の体液がこの多数の空孔内に入り込み、吸収剤Aに吸収されることとなる。このとき、吸収剤Aに吸収された体液のうち、一部の体液が、浸透圧によって親水性の連続骨格内に吸収されて、連続骨格が伸長する。一方、吸収剤Aに吸収された体液のうち、親水性の連続骨格内に吸収されない体液が、空孔内に留められた状態で吸収される。
First, the continuous pores included in the absorbent A shown in FIGS. 3 to 7 are pores in which a plurality of pores (pores) communicate with each other, and a large number of pores are provided from the appearance. Can be visually recognized with the naked eye. When the body fluid comes into contact with the absorbent A having such a large number of pores, a certain amount of the body fluid enters the large number of pores and is absorbed by the absorbent A due to the capillary phenomenon. At this time, some of the body fluids absorbed by the absorbent A are absorbed into the hydrophilic continuous skeleton by osmotic pressure, and the continuous skeleton is elongated. On the other hand, among the body fluids absorbed by the absorbent A, the body fluids that are not absorbed in the hydrophilic continuous skeleton are absorbed in a state of being retained in the pores.
このように吸収剤Aは、体液を吸収する時に親水性の連続骨格が伸長する性質を有している。この連続骨格の伸長は、ほぼ全方位に亘って生じる。さらに、このような連続骨格の伸長によって吸収剤Aの外形が大きくなるのに伴い、各空孔の大きさも大きくなる。このように空孔の大きさが大きくなると、空孔内の容積が大きくなるため、空孔内に留めることができる体液の量も増えることとなる。
つまり、一定量の体液を吸収して大きくなった吸収剤Aは、毛細管現象によって、さらに所定量の体液を拡大した空孔内に吸収することができる。
さらに、吸収剤Aは、毛細管現象によって体液を吸収するものであるため、体液の吸収を素早く行うことができる。 As described above, the absorbent A has a property that the hydrophilic continuous skeleton is elongated when the body fluid is absorbed. This extension of the continuous skeleton occurs in almost all directions. Further, as the outer shape of the absorbent A becomes larger due to the extension of the continuous skeleton, the size of each pore also becomes larger. As the size of the vacancies increases in this way, the volume inside the vacancies increases, so that the amount of body fluid that can be retained in the vacancies also increases.
That is, the absorbent A, which has become larger by absorbing a certain amount of body fluid, can further absorb a predetermined amount of body fluid into the enlarged pores by the capillary phenomenon.
Further, since the absorbent A absorbs the body fluid by the capillary phenomenon, the body fluid can be quickly absorbed.
つまり、一定量の体液を吸収して大きくなった吸収剤Aは、毛細管現象によって、さらに所定量の体液を拡大した空孔内に吸収することができる。
さらに、吸収剤Aは、毛細管現象によって体液を吸収するものであるため、体液の吸収を素早く行うことができる。 As described above, the absorbent A has a property that the hydrophilic continuous skeleton is elongated when the body fluid is absorbed. This extension of the continuous skeleton occurs in almost all directions. Further, as the outer shape of the absorbent A becomes larger due to the extension of the continuous skeleton, the size of each pore also becomes larger. As the size of the vacancies increases in this way, the volume inside the vacancies increases, so that the amount of body fluid that can be retained in the vacancies also increases.
That is, the absorbent A, which has become larger by absorbing a certain amount of body fluid, can further absorb a predetermined amount of body fluid into the enlarged pores by the capillary phenomenon.
Further, since the absorbent A absorbs the body fluid by the capillary phenomenon, the body fluid can be quickly absorbed.
また、吸収剤Aに吸収された体液は、親水性の連続骨格内に吸収される体液よりも、空孔内に留まる体液の方が多くなっている。吸収剤Aによる体液の吸収の大部分は、毛細管現象によって空孔内に体液を留めることによって行われるため、空孔の空隙の体積(全細孔容積)の割合である空隙率(吸収剤Aの体積に対する空孔の空隙の体積)が大きいほど、より多くの体液を吸収することができる。なお、この空隙率は85%以上であることが好ましい。
In addition, the amount of body fluid absorbed by the absorbent A is larger than that absorbed in the hydrophilic continuous skeleton. Since most of the absorption of body fluid by the absorbent A is performed by retaining the body fluid in the pores by capillarity, the porosity (absorbent A) which is the ratio of the volume of the voids in the pores (total pore volume). The larger the volume of the voids in the pores relative to the volume of the pores), the more body fluid can be absorbed. The porosity is preferably 85% or more.
例えば、上述の図3~図7に示す吸収剤Aの空隙率を求めると、以下のようになる。
まず、水銀圧入法によって得られた吸収剤Aの比表面積は400m2/gであり、細孔容積は15.5mL/gである。この細孔容積15.5mL/gは、1gの吸収剤Aの中にある細孔の容積が15.5mLであることを意味する。
ここで、吸収剤Aの比重を仮に1g/mLと仮定すると、1gの吸収剤Aの中で細孔が占める体積、すなわち細孔容積は15.5mLとなり、また、1gの吸収剤Aの体積は1mLとなる。
そうすると、1gの吸収剤Aの全容積(体積)は、15.5+1(mL)となり、そのうちの細孔容積の比率が空隙率となるため、吸収剤Aの空隙率は、15.5/(15.5+1)×100≒94%となる。 For example, the porosity of the absorbent A shown in FIGS. 3 to 7 described above is as follows.
First, the specific surface area of the absorbent A obtained by the mercury intrusion method is 400 m 2 / g, and the pore volume is 15.5 mL / g. This pore volume of 15.5 mL / g means that the volume of the pores in 1 g of the absorbent A is 15.5 mL.
Here, assuming that the specific gravity of the absorbent A is 1 g / mL, the volume occupied by the pores in 1 g of the absorbent A, that is, the pore volume is 15.5 mL, and the volume of the absorbent A of 1 g. Becomes 1 mL.
Then, the total volume (volume) of 1 g of the absorbent A becomes 15.5 + 1 (mL), and the ratio of the pore volume thereof becomes the porosity. Therefore, the porosity of the absorbent A is 15.5 / (. 15.5 + 1) × 100 ≈ 94%.
まず、水銀圧入法によって得られた吸収剤Aの比表面積は400m2/gであり、細孔容積は15.5mL/gである。この細孔容積15.5mL/gは、1gの吸収剤Aの中にある細孔の容積が15.5mLであることを意味する。
ここで、吸収剤Aの比重を仮に1g/mLと仮定すると、1gの吸収剤Aの中で細孔が占める体積、すなわち細孔容積は15.5mLとなり、また、1gの吸収剤Aの体積は1mLとなる。
そうすると、1gの吸収剤Aの全容積(体積)は、15.5+1(mL)となり、そのうちの細孔容積の比率が空隙率となるため、吸収剤Aの空隙率は、15.5/(15.5+1)×100≒94%となる。 For example, the porosity of the absorbent A shown in FIGS. 3 to 7 described above is as follows.
First, the specific surface area of the absorbent A obtained by the mercury intrusion method is 400 m 2 / g, and the pore volume is 15.5 mL / g. This pore volume of 15.5 mL / g means that the volume of the pores in 1 g of the absorbent A is 15.5 mL.
Here, assuming that the specific gravity of the absorbent A is 1 g / mL, the volume occupied by the pores in 1 g of the absorbent A, that is, the pore volume is 15.5 mL, and the volume of the absorbent A of 1 g. Becomes 1 mL.
Then, the total volume (volume) of 1 g of the absorbent A becomes 15.5 + 1 (mL), and the ratio of the pore volume thereof becomes the porosity. Therefore, the porosity of the absorbent A is 15.5 / (. 15.5 + 1) × 100 ≈ 94%.
そして、本発明においては、このような親水性の連続骨格及び連続空孔を備えた吸収剤A、すなわち高分子吸収剤は、例えば粒子状やシート状等の形態で、上述の軽失禁パッド1の複合吸収体4のような尿などの体液を吸収するための複合吸収体に適用される。
さらに、この高分子吸収剤は、上述のとおり、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有している。 In the present invention, the absorbent A having such a hydrophilic continuous skeleton and continuous pores, that is, the polymer absorbent is in the form of particles, sheets, etc., and the above-mentioned light incontinence pad 1 is used. It is applied to a complex absorber for absorbing body fluid such as urine, such as the complex absorber 4 of the above.
Further, as described above, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more. There is.
さらに、この高分子吸収剤は、上述のとおり、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であるという特定の液吐出し性を有している。 In the present invention, the absorbent A having such a hydrophilic continuous skeleton and continuous pores, that is, the polymer absorbent is in the form of particles, sheets, etc., and the above-mentioned light incontinence pad 1 is used. It is applied to a complex absorber for absorbing body fluid such as urine, such as the complex absorber 4 of the above.
Further, as described above, this polymer absorbent has a specific liquid discharge property that the liquid discharge amount of the absorbed water is 20 g / g or more and the liquid discharge rate is 65% or more. There is.
かかる高分子吸収剤は、毛細管現象によって体液を連続空孔に取り込むことができ、さらに、上記特定の高い液吐出し量及び液吐出し率を有していることで(すなわち、高い保水能力と優れた水分放出性(離水性)を有していることで)、一度に多量の体液を保持することができるとともに、吸収・保持した体液を多量に放出することができる。
したがって、このような高分子吸収剤を含む本発明の複合吸収体は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。
なお、高分子吸収剤の液吐出し量は、35g/g以上であることが特に好ましく、また、液吐出し率は、70%以上であることがより好ましく、75%以上であることが特に好ましい。
これら高分子吸収剤の液吐出し量及び液吐出し率は、次のようにして測定することができる。 Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and further has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
Therefore, the composite absorber of the present invention containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of the SAP is sufficient. It can be utilized and can exhibit high absorption performance as an absorber.
The liquid discharge amount of the polymer absorbent is particularly preferably 35 g / g or more, and the liquid discharge rate is more preferably 70% or more, particularly preferably 75% or more. preferable.
The liquid discharge amount and the liquid discharge rate of these polymer absorbents can be measured as follows.
したがって、このような高分子吸収剤を含む本発明の複合吸収体は、高分子吸収剤から高吸収性ポリマー(SAP)へ多量の体液を受け渡すことができるため、SAPの保水能力を十分に活用することができ、吸収体として高い吸収性能を発揮することができる。
なお、高分子吸収剤の液吐出し量は、35g/g以上であることが特に好ましく、また、液吐出し率は、70%以上であることがより好ましく、75%以上であることが特に好ましい。
これら高分子吸収剤の液吐出し量及び液吐出し率は、次のようにして測定することができる。 Such a polymer absorbent can take in body fluid into continuous pores by capillarity, and further has the above-mentioned specific high liquid discharge amount and liquid discharge rate (that is, high water retention capacity). (By having excellent water release property (water separation)), a large amount of body fluid can be retained at one time, and a large amount of absorbed / retained body fluid can be released.
Therefore, the composite absorber of the present invention containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the highly absorbent polymer (SAP), so that the water retention capacity of the SAP is sufficient. It can be utilized and can exhibit high absorption performance as an absorber.
The liquid discharge amount of the polymer absorbent is particularly preferably 35 g / g or more, and the liquid discharge rate is more preferably 70% or more, particularly preferably 75% or more. preferable.
The liquid discharge amount and the liquid discharge rate of these polymer absorbents can be measured as follows.
<高分子吸収剤の液吐出し量及び液吐出し率の測定方法>
(1)測定用の試料(高分子吸収剤)1gを10cm四方に切断したメッシュ袋((株)NBCメッシュテック製、N-NO255HD 115(規格巾:115cm、255メッシュ/2.54cm、オープニング:57μm、線径:43μm、厚さ:75μm))に封入する。なお、メッシュ袋は、予め質量(g)を測定しておく。また、本測定方法は、温度25℃、湿度60%の条件下で行う。さらに、測定用の試料(高分子吸収剤)を衛生用品の製品から回収して用いる場合は、後述する<測定用の試料(高分子吸収剤)の回収方法>に従って得ることができる。
(2)試料を封入したメッシュ袋を生理食塩水(0.9%塩化ナトリウム水溶液)に1時間浸漬する。
(3)メッシュ袋を5分間吊るして水切りした後の質量(g)を測定する。
(4)上記(3)で測定した水切り後のメッシュ袋の質量から試料の質量(=1g)及びメッシュ袋の合計質量を差し引くことにより試料の吸水量(g)を算出し、さらにこの吸水量を試料の質量(=1g)で除することにより試料(高分子吸収剤)の単位質量当たりの吸水量(g/g)を得る。
(5)さらに、上記(3)で水切りした後のメッシュ袋に、150Gで90秒間の遠心処理を施し、その遠心処理後のメッシュ袋の質量(g)を測定する。
(6)上記(5)で測定した遠心処理後のメッシュ袋の質量から試料の質量(=1g)及びメッシュ袋の合計質量を差し引くことにより試料の液吐出し量(g)を算出し、さらにこの液吐出し量を試料の質量(=1g)で除することにより試料(高分子吸収剤)の単位質量当たりの液吐出し量(g/g)を得る。
(7)上記(6)で得た単位質量当たりの液吐出し量を上記(4)で得た単位質量当たりの吸水量で除して100を乗ずることにより、試料(高分子吸収剤)の吸水量に対する液吐出し量、すなわち液吐出し率(%)を得る。
なお、後述する吸水及び離水を3回繰り返した後の繰返し液吐出し率は、上記の(2)~(6)の工程を3回繰り返した後の液吐出し率(%)を意味する。 <Measurement method of liquid discharge amount and liquid discharge rate of polymer absorbent>
(1) Mesh bag obtained by cutting 1 g of a sample (polymer absorbent) for measurement into 10 cm squares (manufactured by NBC Meshtec Inc., N-NO255HD 115 (standard width: 115 cm, 255 mesh / 2.54 cm, opening:) Enclose in 57 μm, wire diameter: 43 μm, thickness: 75 μm)). The mass (g) of the mesh bag is measured in advance. Further, this measuring method is carried out under the conditions of a temperature of 25 ° C. and a humidity of 60%. Further, when the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to <Method for recovering sample for measurement (polymer absorbent) described later>.
(2) Immerse the mesh bag containing the sample in physiological saline (0.9% sodium chloride aqueous solution) for 1 hour.
(3) The mass (g) after hanging the mesh bag for 5 minutes and draining it is measured.
(4) The water absorption amount (g) of the sample is calculated by subtracting the mass of the sample (= 1 g) and the total mass of the mesh bag from the mass of the mesh bag after draining measured in (3) above, and further, this water absorption amount. Is divided by the mass of the sample (= 1 g) to obtain the water absorption amount (g / g) per unit mass of the sample (polymer absorbent).
(5) Further, the mesh bag after draining in (3) above is subjected to centrifugation at 150 G for 90 seconds, and the mass (g) of the mesh bag after the centrifugation is measured.
(6) The liquid discharge amount (g) of the sample is calculated by subtracting the mass of the sample (= 1 g) and the total mass of the mesh bag from the mass of the mesh bag after the centrifugation measured in (5) above, and further. By dividing this liquid discharge amount by the mass of the sample (= 1 g), the liquid discharge amount (g / g) per unit mass of the sample (polymer absorbent) is obtained.
(7) The sample (polymer absorbent) is obtained by dividing the liquid discharge amount per unit mass obtained in (6) above by the water absorption amount per unit mass obtained in (4) above and multiplying by 100. The liquid discharge amount with respect to the water absorption amount, that is, the liquid discharge rate (%) is obtained.
The repeated liquid discharge rate after repeating water absorption and water separation three times, which will be described later, means the liquid discharge rate (%) after repeating the above steps (2) to (6) three times.
(1)測定用の試料(高分子吸収剤)1gを10cm四方に切断したメッシュ袋((株)NBCメッシュテック製、N-NO255HD 115(規格巾:115cm、255メッシュ/2.54cm、オープニング:57μm、線径:43μm、厚さ:75μm))に封入する。なお、メッシュ袋は、予め質量(g)を測定しておく。また、本測定方法は、温度25℃、湿度60%の条件下で行う。さらに、測定用の試料(高分子吸収剤)を衛生用品の製品から回収して用いる場合は、後述する<測定用の試料(高分子吸収剤)の回収方法>に従って得ることができる。
(2)試料を封入したメッシュ袋を生理食塩水(0.9%塩化ナトリウム水溶液)に1時間浸漬する。
(3)メッシュ袋を5分間吊るして水切りした後の質量(g)を測定する。
(4)上記(3)で測定した水切り後のメッシュ袋の質量から試料の質量(=1g)及びメッシュ袋の合計質量を差し引くことにより試料の吸水量(g)を算出し、さらにこの吸水量を試料の質量(=1g)で除することにより試料(高分子吸収剤)の単位質量当たりの吸水量(g/g)を得る。
(5)さらに、上記(3)で水切りした後のメッシュ袋に、150Gで90秒間の遠心処理を施し、その遠心処理後のメッシュ袋の質量(g)を測定する。
(6)上記(5)で測定した遠心処理後のメッシュ袋の質量から試料の質量(=1g)及びメッシュ袋の合計質量を差し引くことにより試料の液吐出し量(g)を算出し、さらにこの液吐出し量を試料の質量(=1g)で除することにより試料(高分子吸収剤)の単位質量当たりの液吐出し量(g/g)を得る。
(7)上記(6)で得た単位質量当たりの液吐出し量を上記(4)で得た単位質量当たりの吸水量で除して100を乗ずることにより、試料(高分子吸収剤)の吸水量に対する液吐出し量、すなわち液吐出し率(%)を得る。
なお、後述する吸水及び離水を3回繰り返した後の繰返し液吐出し率は、上記の(2)~(6)の工程を3回繰り返した後の液吐出し率(%)を意味する。 <Measurement method of liquid discharge amount and liquid discharge rate of polymer absorbent>
(1) Mesh bag obtained by cutting 1 g of a sample (polymer absorbent) for measurement into 10 cm squares (manufactured by NBC Meshtec Inc., N-NO255HD 115 (standard width: 115 cm, 255 mesh / 2.54 cm, opening:) Enclose in 57 μm, wire diameter: 43 μm, thickness: 75 μm)). The mass (g) of the mesh bag is measured in advance. Further, this measuring method is carried out under the conditions of a temperature of 25 ° C. and a humidity of 60%. Further, when the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to <Method for recovering sample for measurement (polymer absorbent) described later>.
(2) Immerse the mesh bag containing the sample in physiological saline (0.9% sodium chloride aqueous solution) for 1 hour.
(3) The mass (g) after hanging the mesh bag for 5 minutes and draining it is measured.
(4) The water absorption amount (g) of the sample is calculated by subtracting the mass of the sample (= 1 g) and the total mass of the mesh bag from the mass of the mesh bag after draining measured in (3) above, and further, this water absorption amount. Is divided by the mass of the sample (= 1 g) to obtain the water absorption amount (g / g) per unit mass of the sample (polymer absorbent).
(5) Further, the mesh bag after draining in (3) above is subjected to centrifugation at 150 G for 90 seconds, and the mass (g) of the mesh bag after the centrifugation is measured.
(6) The liquid discharge amount (g) of the sample is calculated by subtracting the mass of the sample (= 1 g) and the total mass of the mesh bag from the mass of the mesh bag after the centrifugation measured in (5) above, and further. By dividing this liquid discharge amount by the mass of the sample (= 1 g), the liquid discharge amount (g / g) per unit mass of the sample (polymer absorbent) is obtained.
(7) The sample (polymer absorbent) is obtained by dividing the liquid discharge amount per unit mass obtained in (6) above by the water absorption amount per unit mass obtained in (4) above and multiplying by 100. The liquid discharge amount with respect to the water absorption amount, that is, the liquid discharge rate (%) is obtained.
The repeated liquid discharge rate after repeating water absorption and water separation three times, which will be described later, means the liquid discharge rate (%) after repeating the above steps (2) to (6) three times.
なお、上述の測定用の試料(高分子吸収剤)を衛生用品の製品から回収して用いる場合は、次のようにして得ることができる。
When the above-mentioned measurement sample (polymer absorbent) is recovered from a sanitary product and used, it can be obtained as follows.
<測定用の試料(高分子吸収剤)の回収方法>
(1)衛生用品の製品から表面シート等を剥がして、複合吸収体を露出させる。
(2)露出させた複合吸収体から測定対象物(高分子吸収剤)を落下させ、(粒子状の)測定対象物以外のもの(例えば、パルプや合成樹脂繊維等)を、ピンセット等を用いて取り除く。
(3)拡大観察手段として顕微鏡又は簡易ルーペを使用し、SAPとの違いを認識できる倍率又は多孔質体の空孔を視認できる倍率で観察しながら、ピンセット等を用いて測定対象物を回収する。なお、簡易ルーペの倍率は、多孔質体の空孔を視認できる倍率であれば特に限定されず、例えば25倍~50倍の倍率が挙げられる。
(4)このようにして回収した測定対象物を、各種測定方法における測定用の試料とする。 <Method of recovering sample (polymer absorbent) for measurement>
(1) Peel off the surface sheet or the like from the hygienic product to expose the composite absorber.
(2) Drop the object to be measured (polymer absorbent) from the exposed composite absorber, and use a tweezers or the like to remove a substance other than the object to be measured (in the form of particles) (for example, pulp or synthetic resin fiber). And remove it.
(3) Using a microscope or a simple loupe as a magnifying observation means, collect the object to be measured using tweezers or the like while observing the difference from SAP at a magnification that can be recognized or the pores of the porous body at a magnification that can be visually recognized. .. The magnification of the simple loupe is not particularly limited as long as the pores of the porous body can be visually recognized, and examples thereof include a magnification of 25 to 50 times.
(4) The measurement object thus recovered is used as a sample for measurement in various measurement methods.
(1)衛生用品の製品から表面シート等を剥がして、複合吸収体を露出させる。
(2)露出させた複合吸収体から測定対象物(高分子吸収剤)を落下させ、(粒子状の)測定対象物以外のもの(例えば、パルプや合成樹脂繊維等)を、ピンセット等を用いて取り除く。
(3)拡大観察手段として顕微鏡又は簡易ルーペを使用し、SAPとの違いを認識できる倍率又は多孔質体の空孔を視認できる倍率で観察しながら、ピンセット等を用いて測定対象物を回収する。なお、簡易ルーペの倍率は、多孔質体の空孔を視認できる倍率であれば特に限定されず、例えば25倍~50倍の倍率が挙げられる。
(4)このようにして回収した測定対象物を、各種測定方法における測定用の試料とする。 <Method of recovering sample (polymer absorbent) for measurement>
(1) Peel off the surface sheet or the like from the hygienic product to expose the composite absorber.
(2) Drop the object to be measured (polymer absorbent) from the exposed composite absorber, and use a tweezers or the like to remove a substance other than the object to be measured (in the form of particles) (for example, pulp or synthetic resin fiber). And remove it.
(3) Using a microscope or a simple loupe as a magnifying observation means, collect the object to be measured using tweezers or the like while observing the difference from SAP at a magnification that can be recognized or the pores of the porous body at a magnification that can be visually recognized. .. The magnification of the simple loupe is not particularly limited as long as the pores of the porous body can be visually recognized, and examples thereof include a magnification of 25 to 50 times.
(4) The measurement object thus recovered is used as a sample for measurement in various measurement methods.
ここで、本発明例としての高分子吸収剤と、比較例としてのパルプ繊維(フラッフパルプ)と、同じく比較例としてのInfinity粒子体と、同じく比較例としての高吸収性ポリマー(SAP)とを用意し、それぞれ吸水及び離水を1~3回繰り返した後の液吐出し量及び液吐出し率を測定した。この液吐出し量及び液吐出し率の測定結果を下記の表1に示す。
なお、上記のInfinity粒子体とは、P&G社製の吸収剤であり、高分子吸収剤と似た構造(発泡構造)を有しているものの、高分子吸収剤とは異なり、吸液して膨張する機能は備えていない。 Here, a polymer absorbent as an example of the present invention, a pulp fiber (fluff pulp) as a comparative example, an Infinity particle body as a comparative example, and a highly absorbent polymer (SAP) as a comparative example are used. Prepared and measured the liquid discharge amount and the liquid discharge rate after repeating water absorption and water separation 1 to 3 times, respectively. The measurement results of the liquid discharge amount and the liquid discharge rate are shown in Table 1 below.
The Infinity particle body is an absorbent manufactured by P & G, and although it has a structure (foaming structure) similar to that of a polymer absorbent, it absorbs liquid unlike a polymer absorbent. It does not have the function of expanding.
なお、上記のInfinity粒子体とは、P&G社製の吸収剤であり、高分子吸収剤と似た構造(発泡構造)を有しているものの、高分子吸収剤とは異なり、吸液して膨張する機能は備えていない。 Here, a polymer absorbent as an example of the present invention, a pulp fiber (fluff pulp) as a comparative example, an Infinity particle body as a comparative example, and a highly absorbent polymer (SAP) as a comparative example are used. Prepared and measured the liquid discharge amount and the liquid discharge rate after repeating water absorption and water separation 1 to 3 times, respectively. The measurement results of the liquid discharge amount and the liquid discharge rate are shown in Table 1 below.
The Infinity particle body is an absorbent manufactured by P & G, and although it has a structure (foaming structure) similar to that of a polymer absorbent, it absorbs liquid unlike a polymer absorbent. It does not have the function of expanding.
表1に示すように、パルプ繊維及びInfinity粒子体は、高い液吐出し率を示しているものの、吸水量自体が小さいため、液吐出し量が小さくなっている。特に、パルプ繊維は、吸水及び離水の繰り返し回数(表1中の「吸水/離水回数」)が増えるたびに、液吐出し量及び液吐出し率が共に低下する傾向を示している。
また、SAPは、吸水量が大きいため、一定以上の液吐出し量を示しているものの、その保水能力によって液吐出し率が小さくなっている。
これらの吸水性材料に対し、高分子吸収剤は、高い液吐出し量及び液吐出し率を示しており(すなわち、高い保水能力と優れた水分放出性(離水性)を示しており)、一度に多量の体液を保持することができるとともに、吸収・保持した体液を多量に放出し得ることがわかる。さらに、高分子吸収剤は、吸水及び離水の繰り返し回数が1~3回のいずれにおいても、安定して高い液吐出し量及び液吐出し率を示しており、体液が繰返し供給されるような場合であっても、多量の体液を保持して、高い液吐出し率で放出し得ることがわかる。
すなわち、高分子吸収剤は、従来のパルプ繊維やInfinity粒子体、SAP等にはない特有の優れた液吐出し性を有していることがわかる。 As shown in Table 1, although the pulp fiber and the Infinity particle body show a high liquid discharge rate, the liquid discharge amount is small because the water absorption amount itself is small. In particular, the pulp fiber shows a tendency that both the liquid discharge amount and the liquid discharge rate decrease as the number of times of water absorption and water separation (“water absorption / water separation frequency” in Table 1) increases.
Further, since SAP has a large amount of water absorption, it shows a liquid discharge amount of a certain level or more, but the liquid discharge rate is small due to its water retention capacity.
For these water-absorbent materials, the polymer absorbent exhibits a high liquid discharge rate and liquid discharge rate (that is, exhibits high water retention capacity and excellent water release property (water release)). It can be seen that a large amount of body fluid can be retained at one time and a large amount of absorbed / retained body fluid can be released. Further, the polymer absorbent has a stable and high liquid discharge amount and liquid discharge rate regardless of the number of times of water absorption and water separation being repeated 1 to 3, so that the body fluid is repeatedly supplied. It can be seen that even in some cases, a large amount of body fluid can be retained and discharged at a high liquid discharge rate.
That is, it can be seen that the polymer absorbent has excellent liquid ejection properties peculiar to conventional pulp fibers, Infinity particles, SAP and the like.
また、SAPは、吸水量が大きいため、一定以上の液吐出し量を示しているものの、その保水能力によって液吐出し率が小さくなっている。
これらの吸水性材料に対し、高分子吸収剤は、高い液吐出し量及び液吐出し率を示しており(すなわち、高い保水能力と優れた水分放出性(離水性)を示しており)、一度に多量の体液を保持することができるとともに、吸収・保持した体液を多量に放出し得ることがわかる。さらに、高分子吸収剤は、吸水及び離水の繰り返し回数が1~3回のいずれにおいても、安定して高い液吐出し量及び液吐出し率を示しており、体液が繰返し供給されるような場合であっても、多量の体液を保持して、高い液吐出し率で放出し得ることがわかる。
すなわち、高分子吸収剤は、従来のパルプ繊維やInfinity粒子体、SAP等にはない特有の優れた液吐出し性を有していることがわかる。 As shown in Table 1, although the pulp fiber and the Infinity particle body show a high liquid discharge rate, the liquid discharge amount is small because the water absorption amount itself is small. In particular, the pulp fiber shows a tendency that both the liquid discharge amount and the liquid discharge rate decrease as the number of times of water absorption and water separation (“water absorption / water separation frequency” in Table 1) increases.
Further, since SAP has a large amount of water absorption, it shows a liquid discharge amount of a certain level or more, but the liquid discharge rate is small due to its water retention capacity.
For these water-absorbent materials, the polymer absorbent exhibits a high liquid discharge rate and liquid discharge rate (that is, exhibits high water retention capacity and excellent water release property (water release)). It can be seen that a large amount of body fluid can be retained at one time and a large amount of absorbed / retained body fluid can be released. Further, the polymer absorbent has a stable and high liquid discharge amount and liquid discharge rate regardless of the number of times of water absorption and water separation being repeated 1 to 3, so that the body fluid is repeatedly supplied. It can be seen that even in some cases, a large amount of body fluid can be retained and discharged at a high liquid discharge rate.
That is, it can be seen that the polymer absorbent has excellent liquid ejection properties peculiar to conventional pulp fibers, Infinity particles, SAP and the like.
本発明において高分子吸収剤は、吸水及び離水を3回繰り返した後の繰返し液吐出し率が65%以上であることが好ましい。高分子吸収剤がこのような高い繰返し液吐出し率を有していると、体液が繰返し供給されるような場合であっても、多量の体液を保持して、高い液吐出し率で放出することができる。
これにより、このような高分子吸収剤を含む複合吸収体は、体液が繰返し供給されるような場合であっても、高分子吸収剤からSAPへ多量の体液を受け渡すことができるため、SAPの保水能力をより一層活用することができ、高い吸収性能を長時間にわたって持続的に発揮することができる。
なお、高分子吸収剤の、吸水及び離水を3回繰り返した後の繰返し液吐出し率は、70%以上であることが更に好ましく、75%以上であることが特に好ましい。 In the present invention, the polymer absorbent preferably has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times. When the polymer absorbent has such a high repetitive liquid discharge rate, even when the body fluid is repeatedly supplied, a large amount of body fluid is retained and discharged at a high liquid discharge rate. can do.
As a result, the composite absorber containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the SAP even when the body fluid is repeatedly supplied, and thus the SAP. The water retention capacity can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
The repeated liquid discharge rate of the polymer absorbent after repeating water absorption and water separation three times is more preferably 70% or more, and particularly preferably 75% or more.
これにより、このような高分子吸収剤を含む複合吸収体は、体液が繰返し供給されるような場合であっても、高分子吸収剤からSAPへ多量の体液を受け渡すことができるため、SAPの保水能力をより一層活用することができ、高い吸収性能を長時間にわたって持続的に発揮することができる。
なお、高分子吸収剤の、吸水及び離水を3回繰り返した後の繰返し液吐出し率は、70%以上であることが更に好ましく、75%以上であることが特に好ましい。 In the present invention, the polymer absorbent preferably has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times. When the polymer absorbent has such a high repetitive liquid discharge rate, even when the body fluid is repeatedly supplied, a large amount of body fluid is retained and discharged at a high liquid discharge rate. can do.
As a result, the composite absorber containing such a polymer absorbent can transfer a large amount of body fluid from the polymer absorbent to the SAP even when the body fluid is repeatedly supplied, and thus the SAP. The water retention capacity can be further utilized, and high absorption performance can be continuously exhibited for a long period of time.
The repeated liquid discharge rate of the polymer absorbent after repeating water absorption and water separation three times is more preferably 70% or more, and particularly preferably 75% or more.
さらに、本発明においては、複合吸収体は、高分子吸収剤からSAPへの液移行量が5.0g/g以上であることが好ましい。高分子吸収剤からSAPへの液移行量が5.0g/g以上であると、高分子吸収剤が一時的に保持した体液を、より確実にSAPへ受け渡すことができるため、吸収体として、高い吸収性能を更に確実に発揮することができる。
なお、高分子吸収剤からSAPへの液移行量は、23.0g/g以上がより好ましく、27.0g/g以上が更に好ましく、33.0g/g以上が特に好ましい。
この高分子吸収剤からSAPへの液移行量は、次のようにして測定することができる。 Further, in the present invention, the composite absorber preferably has a liquid transfer amount from the polymer absorbent to SAP of 5.0 g / g or more. When the amount of liquid transferred from the polymer absorbent to SAP is 5.0 g / g or more, the body fluid temporarily held by the polymer absorbent can be more reliably delivered to SAP, so that it can be used as an absorber. , High absorption performance can be exhibited more reliably.
The amount of liquid transferred from the polymer absorbent to SAP is more preferably 23.0 g / g or more, further preferably 27.0 g / g or more, and particularly preferably 33.0 g / g or more.
The amount of liquid transferred from this polymer absorbent to SAP can be measured as follows.
なお、高分子吸収剤からSAPへの液移行量は、23.0g/g以上がより好ましく、27.0g/g以上が更に好ましく、33.0g/g以上が特に好ましい。
この高分子吸収剤からSAPへの液移行量は、次のようにして測定することができる。 Further, in the present invention, the composite absorber preferably has a liquid transfer amount from the polymer absorbent to SAP of 5.0 g / g or more. When the amount of liquid transferred from the polymer absorbent to SAP is 5.0 g / g or more, the body fluid temporarily held by the polymer absorbent can be more reliably delivered to SAP, so that it can be used as an absorber. , High absorption performance can be exhibited more reliably.
The amount of liquid transferred from the polymer absorbent to SAP is more preferably 23.0 g / g or more, further preferably 27.0 g / g or more, and particularly preferably 33.0 g / g or more.
The amount of liquid transferred from this polymer absorbent to SAP can be measured as follows.
<高分子吸収剤からSAPへの液移行量の測定方法>
(1)底面にナイロン製メッシュ材((株)NBCメッシュテック製、N-NO255HD 115(規格巾:115cm、255メッシュ/2.54cm、オープニング:57μm、線径:43μm、厚さ:75μm))を貼り付けたプラスチック製の円筒(内径:60mm、外径:70mm、高さ:52mm、質量:64g)の中に、測定用の試料(高分子吸収剤)を0.3g入れて、均一にならし、円筒の質量(g)を測定する。なお、本測定方法は、温度25℃、湿度60%の条件下で行う。また、測定用の試料(高分子吸収剤)を衛生用品の製品から回収して用いる場合は、前述の<測定用の試料(高分子吸収剤)の回収方法>に従って得ることができる。
(2)シャーレ(内径:85mm、深さ:20mm)の中にプラスチック製の円筒(内径:60mm、外径:70mm、高さ:52mm、質量:64g)を置き、高吸収性ポリマー(SAP)0.3gを円筒内に均等に振り入れた後、円筒を外し、シャーレの質量(g)を測定する。
(3)台座付きのシャーレ(内径:85mm、深さ:20mm、台座配置:底面(内面側)中央部に2個の台座を24mm間隔で平行に配置、台座幅:2mm、台座高さ:2mm、台座長さ:25mm)に生理食塩水(0.9%塩化ナトリウム水溶液)を60mL入れる。
(4)測定用の試料(高分子吸収剤)の入った円筒を台座付きのシャーレの中央部の台座の上に置いて、円筒の底面を生理食塩水に浸し、生理食塩水を円筒の中の試料に3分間吸水させる。
(5)3分間の吸水後に円筒を引き上げ、円筒を45°傾けて1分間水切りした後、円筒の質量(g)を測定する。
(6)上記(5)で測定した吸水後の円筒の質量(g)を上記(1)で測定した吸水前の円筒の質量(g)から差し引くことにより試料の吸水量(g)を算出し、さらにこの吸水量を試料の質量(=0.3g)で除することにより試料の単位質量当たりの吸水量(g/g)を得る。
(7)そして、上記(5)で水切りした後の円筒を、SAPを入れたシャーレの上に置き、円筒の中の試料とシャーレ内のSAPとを、円筒の底面(メッシュ材)を介して接触させる。
(8)試料とSAPを接触させてから3分後に、円筒を取り外し、シャーレの質量(g)を測定する。
(9)上記(8)で測定したシャーレの質量(g)を上記(2)で測定したシャーレの質量(g)で差し引くことによりSAPの吸水量(g)を算出し、さらにこの吸水量を試料の質量(=0.3g)で除することにより試料の単位質量当たりのSAPの吸水量(g/g)、すなわち試料の単位質量当たりのSAPへの液移行量(g/g)を得る。 <Measuring method of liquid transfer amount from polymer absorbent to SAP>
(1) Nylon mesh material on the bottom surface (N-NO255HD 115 manufactured by NBC Mesh Tech Co., Ltd. (standard width: 115 cm, 255 mesh / 2.54 cm, opening: 57 μm, wire diameter: 43 μm, thickness: 75 μm)) In a plastic cylinder (inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g) to which is pasted, 0.3 g of a sample for measurement (polymer absorbent) is placed uniformly. Break in and measure the mass (g) of the cylinder. This measuring method is performed under the conditions of a temperature of 25 ° C. and a humidity of 60%. Further, when the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to the above-mentioned <Method for recovering the sample for measurement (polymer absorbent)>.
(2) A plastic cylinder (inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g) is placed in a petri dish (inner diameter: 85 mm, depth: 20 mm), and a highly absorbent polymer (SAP) is placed. After evenly sprinkling 0.3 g into the cylinder, remove the cylinder and measure the mass (g) of the petri dish.
(3) Chloride with pedestal (inner diameter: 85 mm, depth: 20 mm, pedestal arrangement: two pedestals arranged in parallel at 24 mm intervals in the center of the bottom surface (inner surface side), pedestal width: 2 mm, pedestal height: 2 mm , Pedestal length: 25 mm), add 60 mL of physiological saline (0.9% sodium chloride aqueous solution).
(4) Place a cylinder containing a sample for measurement (polymer absorbent) on a pedestal in the center of a petri dish with a pedestal, immerse the bottom of the cylinder in physiological saline, and immerse the physiological saline in the cylinder. Let the sample absorb water for 3 minutes.
(5) After absorbing water for 3 minutes, the cylinder is pulled up, the cylinder is tilted at 45 ° and drained for 1 minute, and then the mass (g) of the cylinder is measured.
(6) The water absorption amount (g) of the sample is calculated by subtracting the mass (g) of the cylinder after water absorption measured in (5) above from the mass (g) of the cylinder before water absorption measured in (1) above. Further, by dividing this water absorption amount by the mass of the sample (= 0.3 g), the water absorption amount (g / g) per unit mass of the sample is obtained.
(7) Then, the cylinder after draining in (5) above is placed on a petri dish containing SAP, and the sample in the cylinder and the SAP in the petri dish are passed through the bottom surface (mesh material) of the cylinder. Make contact.
(8) Three minutes after the sample and SAP are brought into contact with each other, the cylinder is removed and the mass (g) of the petri dish is measured.
(9) The water absorption amount (g) of the SAP is calculated by subtracting the mass (g) of the chalet measured in (8) above by the mass (g) of the chalet measured in (2) above, and the water absorption amount is further calculated. By dividing by the mass of the sample (= 0.3 g), the water absorption amount of SAP per unit mass of the sample (g / g), that is, the amount of liquid transferred to the SAP per unit mass of the sample (g / g) is obtained. ..
(1)底面にナイロン製メッシュ材((株)NBCメッシュテック製、N-NO255HD 115(規格巾:115cm、255メッシュ/2.54cm、オープニング:57μm、線径:43μm、厚さ:75μm))を貼り付けたプラスチック製の円筒(内径:60mm、外径:70mm、高さ:52mm、質量:64g)の中に、測定用の試料(高分子吸収剤)を0.3g入れて、均一にならし、円筒の質量(g)を測定する。なお、本測定方法は、温度25℃、湿度60%の条件下で行う。また、測定用の試料(高分子吸収剤)を衛生用品の製品から回収して用いる場合は、前述の<測定用の試料(高分子吸収剤)の回収方法>に従って得ることができる。
(2)シャーレ(内径:85mm、深さ:20mm)の中にプラスチック製の円筒(内径:60mm、外径:70mm、高さ:52mm、質量:64g)を置き、高吸収性ポリマー(SAP)0.3gを円筒内に均等に振り入れた後、円筒を外し、シャーレの質量(g)を測定する。
(3)台座付きのシャーレ(内径:85mm、深さ:20mm、台座配置:底面(内面側)中央部に2個の台座を24mm間隔で平行に配置、台座幅:2mm、台座高さ:2mm、台座長さ:25mm)に生理食塩水(0.9%塩化ナトリウム水溶液)を60mL入れる。
(4)測定用の試料(高分子吸収剤)の入った円筒を台座付きのシャーレの中央部の台座の上に置いて、円筒の底面を生理食塩水に浸し、生理食塩水を円筒の中の試料に3分間吸水させる。
(5)3分間の吸水後に円筒を引き上げ、円筒を45°傾けて1分間水切りした後、円筒の質量(g)を測定する。
(6)上記(5)で測定した吸水後の円筒の質量(g)を上記(1)で測定した吸水前の円筒の質量(g)から差し引くことにより試料の吸水量(g)を算出し、さらにこの吸水量を試料の質量(=0.3g)で除することにより試料の単位質量当たりの吸水量(g/g)を得る。
(7)そして、上記(5)で水切りした後の円筒を、SAPを入れたシャーレの上に置き、円筒の中の試料とシャーレ内のSAPとを、円筒の底面(メッシュ材)を介して接触させる。
(8)試料とSAPを接触させてから3分後に、円筒を取り外し、シャーレの質量(g)を測定する。
(9)上記(8)で測定したシャーレの質量(g)を上記(2)で測定したシャーレの質量(g)で差し引くことによりSAPの吸水量(g)を算出し、さらにこの吸水量を試料の質量(=0.3g)で除することにより試料の単位質量当たりのSAPの吸水量(g/g)、すなわち試料の単位質量当たりのSAPへの液移行量(g/g)を得る。 <Measuring method of liquid transfer amount from polymer absorbent to SAP>
(1) Nylon mesh material on the bottom surface (N-NO255HD 115 manufactured by NBC Mesh Tech Co., Ltd. (standard width: 115 cm, 255 mesh / 2.54 cm, opening: 57 μm, wire diameter: 43 μm, thickness: 75 μm)) In a plastic cylinder (inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g) to which is pasted, 0.3 g of a sample for measurement (polymer absorbent) is placed uniformly. Break in and measure the mass (g) of the cylinder. This measuring method is performed under the conditions of a temperature of 25 ° C. and a humidity of 60%. Further, when the sample for measurement (polymer absorbent) is recovered from the product of sanitary goods and used, it can be obtained according to the above-mentioned <Method for recovering the sample for measurement (polymer absorbent)>.
(2) A plastic cylinder (inner diameter: 60 mm, outer diameter: 70 mm, height: 52 mm, mass: 64 g) is placed in a petri dish (inner diameter: 85 mm, depth: 20 mm), and a highly absorbent polymer (SAP) is placed. After evenly sprinkling 0.3 g into the cylinder, remove the cylinder and measure the mass (g) of the petri dish.
(3) Chloride with pedestal (inner diameter: 85 mm, depth: 20 mm, pedestal arrangement: two pedestals arranged in parallel at 24 mm intervals in the center of the bottom surface (inner surface side), pedestal width: 2 mm, pedestal height: 2 mm , Pedestal length: 25 mm), add 60 mL of physiological saline (0.9% sodium chloride aqueous solution).
(4) Place a cylinder containing a sample for measurement (polymer absorbent) on a pedestal in the center of a petri dish with a pedestal, immerse the bottom of the cylinder in physiological saline, and immerse the physiological saline in the cylinder. Let the sample absorb water for 3 minutes.
(5) After absorbing water for 3 minutes, the cylinder is pulled up, the cylinder is tilted at 45 ° and drained for 1 minute, and then the mass (g) of the cylinder is measured.
(6) The water absorption amount (g) of the sample is calculated by subtracting the mass (g) of the cylinder after water absorption measured in (5) above from the mass (g) of the cylinder before water absorption measured in (1) above. Further, by dividing this water absorption amount by the mass of the sample (= 0.3 g), the water absorption amount (g / g) per unit mass of the sample is obtained.
(7) Then, the cylinder after draining in (5) above is placed on a petri dish containing SAP, and the sample in the cylinder and the SAP in the petri dish are passed through the bottom surface (mesh material) of the cylinder. Make contact.
(8) Three minutes after the sample and SAP are brought into contact with each other, the cylinder is removed and the mass (g) of the petri dish is measured.
(9) The water absorption amount (g) of the SAP is calculated by subtracting the mass (g) of the chalet measured in (8) above by the mass (g) of the chalet measured in (2) above, and the water absorption amount is further calculated. By dividing by the mass of the sample (= 0.3 g), the water absorption amount of SAP per unit mass of the sample (g / g), that is, the amount of liquid transferred to the SAP per unit mass of the sample (g / g) is obtained. ..
以下、このような高分子吸収剤の製造方法について、上述の吸収剤Aを例にして詳細に説明する。
Hereinafter, a method for producing such a polymer absorbent will be described in detail by taking the above-mentioned absorbent A as an example.
[高分子吸収剤の製造方法]
上述の吸収剤Aは、図2に示すように、架橋重合工程と加水分解工程を経ることにより得ることができる。以下、これらの各工程について説明する。 [Manufacturing method of polymer absorbent]
As shown in FIG. 2, the above-mentioned absorbent A can be obtained by undergoing a cross-linking polymerization step and a hydrolysis step. Hereinafter, each of these steps will be described.
上述の吸収剤Aは、図2に示すように、架橋重合工程と加水分解工程を経ることにより得ることができる。以下、これらの各工程について説明する。 [Manufacturing method of polymer absorbent]
As shown in FIG. 2, the above-mentioned absorbent A can be obtained by undergoing a cross-linking polymerization step and a hydrolysis step. Hereinafter, each of these steps will be described.
(架橋重合工程)
まず、架橋重合用の油溶性モノマーと、架橋性モノマーと、界面活性剤と、水と、必要に応じて重合開始剤とを混合し、油中水滴型エマルションを得る。この油中水滴型エマルションは、油相が連続相となって、その中に水滴が分散したエマルションである。 (Crosslink polymerization step)
First, an oil-soluble monomer for cross-linking polymerization, a cross-linking monomer, a surfactant, water, and, if necessary, a polymerization initiator are mixed to obtain a water-in-oil emulsion. This water-in-oil emulsion is an emulsion in which the oil phase becomes a continuous phase and water droplets are dispersed therein.
まず、架橋重合用の油溶性モノマーと、架橋性モノマーと、界面活性剤と、水と、必要に応じて重合開始剤とを混合し、油中水滴型エマルションを得る。この油中水滴型エマルションは、油相が連続相となって、その中に水滴が分散したエマルションである。 (Crosslink polymerization step)
First, an oil-soluble monomer for cross-linking polymerization, a cross-linking monomer, a surfactant, water, and, if necessary, a polymerization initiator are mixed to obtain a water-in-oil emulsion. This water-in-oil emulsion is an emulsion in which the oil phase becomes a continuous phase and water droplets are dispersed therein.
そして、上述の吸収剤Aにおいては、図2の上図に示すように、油溶性モノマーとして、(メタ)アクリル酸エステルであるメタクリル酸ブチルを用い、架橋性モノマーとして、ジビニルベンゼンを用い、界面活性剤としてソルビタンモノオレエートを用い、さらに重合開始剤としてイソブチロニトリルを用いて架橋重合させ、モノリスAを得る。
Then, in the above-mentioned absorber A, as shown in the upper figure of FIG. 2, butyl methacrylate, which is a (meth) acrylic acid ester, is used as the oil-soluble monomer, and divinylbenzene is used as the crosslinkable monomer, and the surfactant is used. Crosslink polymerization is carried out using sorbitan monooleate as an activator and isobutyronitrile as a polymerization initiator to obtain monolith A.
具体的には、吸収剤Aにおいては、図2の上図に示すように、まず、油溶性モノマーとしてのメタクリル酸t-ブチル9.2gと、架橋性モノマーとしてのジビニルベンゼン0.28gと、界面活性剤としてのソルビタンモノオレエート(以下、「SMO」と略す。)1.0gと、重合開始剤としての2,2’-アゾビス(イソブチロニトリル)0.4gとを混合し、均一に溶解させる。
次に、メタクリル酸t-ブチル/ジビニルベンゼン/SMO/2,2’-アゾビス(イソブチロニトリル)の混合物を180gの純水に添加し、遊星式撹拌装置である真空撹拌脱泡ミキサー(イーエムイー社製)を用いて減圧下で撹拌し、油中水滴型エマルションを得る。 Specifically, in the absorbent A, as shown in the upper figure of FIG. 2, first, 9.2 g of t-butyl methacrylate as an oil-soluble monomer and 0.28 g of divinylbenzene as a crosslinkable monomer were used. 1.0 g of sorbitan monooleate (hereinafter abbreviated as "SMO") as a surfactant and 0.4 g of 2,2'-azobis (isobutyronitrile) as a polymerization initiator are mixed and uniformly mixed. Dissolve in.
Next, a mixture of t-butyl methacrylate / divinylbenzene / SMO / 2,2'-azobis (isobutyronitrile) was added to 180 g of pure water, and a vacuum stirring defoaming mixer (EM), which is a planetary stirring device, was added. Stir under reduced pressure using (manufactured by E) to obtain a water-in-oil emulsion.
次に、メタクリル酸t-ブチル/ジビニルベンゼン/SMO/2,2’-アゾビス(イソブチロニトリル)の混合物を180gの純水に添加し、遊星式撹拌装置である真空撹拌脱泡ミキサー(イーエムイー社製)を用いて減圧下で撹拌し、油中水滴型エマルションを得る。 Specifically, in the absorbent A, as shown in the upper figure of FIG. 2, first, 9.2 g of t-butyl methacrylate as an oil-soluble monomer and 0.28 g of divinylbenzene as a crosslinkable monomer were used. 1.0 g of sorbitan monooleate (hereinafter abbreviated as "SMO") as a surfactant and 0.4 g of 2,2'-azobis (isobutyronitrile) as a polymerization initiator are mixed and uniformly mixed. Dissolve in.
Next, a mixture of t-butyl methacrylate / divinylbenzene / SMO / 2,2'-azobis (isobutyronitrile) was added to 180 g of pure water, and a vacuum stirring defoaming mixer (EM), which is a planetary stirring device, was added. Stir under reduced pressure using (manufactured by E) to obtain a water-in-oil emulsion.
さらに、このエマルションを速やかに反応容器に移して密封し、静置下で60℃、24時間の条件で重合させる。重合終了後に内容物を取り出し、メタノールで抽出した後、減圧乾燥して、連続マクロポア構造を有するモノリスAを得る。なお、モノリスAの内部構造をSEMにより観察した結果、モノリスAは、連続気泡構造を有しており、連続骨格の厚みは5.4μmであった。また、水銀圧入法により測定した連続空孔の平均直径は36.2μm、全細孔容積は15.5mL/gであった。
Further, this emulsion is immediately transferred to a reaction vessel, sealed, and polymerized at 60 ° C. for 24 hours under the static condition. After completion of the polymerization, the contents are taken out, extracted with methanol, and dried under reduced pressure to obtain Monolith A having a continuous macropore structure. As a result of observing the internal structure of the monolith A by SEM, the monolith A had an open cell structure and the thickness of the continuous skeleton was 5.4 μm. The average diameter of the continuous pores measured by the mercury intrusion method was 36.2 μm, and the total pore volume was 15.5 mL / g.
なお、全モノマーに対するジビニルベンゼンの含有量は、0.3~10モル%であることが好ましく、0.3~5モル%であることがより好ましい。また、メタアクリル酸ブチルとジビニルベンゼンの合計に対するジビニルベンゼンの割合が0.1~10モル%であることが好ましく、0.3~8モル%であることがより好ましい。なお、上述の吸収剤Aにおいては、メタアクリル酸ブチルとジビニルベンゼンの合計に対するメタアクリル酸ブチルの割合が97.0モル%であり、ジビニルベンゼンの割合が3.0モル%である。
The content of divinylbenzene with respect to all the monomers is preferably 0.3 to 10 mol%, more preferably 0.3 to 5 mol%. Further, the ratio of divinylbenzene to the total of butyl methacrylate and divinylbenzene is preferably 0.1 to 10 mol%, more preferably 0.3 to 8 mol%. In the above-mentioned absorbent A, the ratio of butyl methacrylate to the total of butyl methacrylate and divinylbenzene is 97.0 mol%, and the ratio of divinylbenzene is 3.0 mol%.
界面活性剤の添加量は、油溶性モノマーの種類及び所望のエマルション粒子(マクロポア)の大きさに応じて設定することができ、油溶性モノマーと界面活性剤の合計量に対して約2~70%の範囲とすることが好ましい。
The amount of the surfactant added can be set according to the type of the oil-soluble monomer and the size of the desired emulsion particles (macropores), and is about 2 to 70 with respect to the total amount of the oil-soluble monomer and the surfactant. It is preferably in the range of%.
なお、モノリスAの気泡形状やサイズなどを制御するために、メタノール、ステアリルアルコール等のアルコール;ステアリン酸等のカルボン酸;オクタン、ドデカン、トルエン等の炭化水素;テトラヒドロフラン、ジオキサン等の環状エーテルなどを重合系内に共存させてもよい。
In order to control the bubble shape and size of monolith A, alcohols such as methanol and stearyl alcohol; carboxylic acids such as stearic acid; hydrocarbons such as octane, dodecane and toluene; cyclic ethers such as tetrahydrofuran and dioxane are used. It may coexist in the polymerization system.
また、油中水滴型エマルションを形成させる際の混合方法は特に制限されず、例えば各成分を一括して一度に混合する方法、油溶性モノマー、界面活性剤及び油溶性重合開始剤である油溶性成分と、水や水溶性重合開始剤である水溶性成分とを別々に均一溶解させた後、それぞれの成分を混合する方法などの任意の混合方法を採用することができる。
The mixing method for forming the water-in-oil emulsion is not particularly limited. For example, a method of mixing each component at once, an oil-soluble monomer, a surfactant, and an oil-soluble polymerization initiator, which are oil-soluble. Any mixing method such as a method in which the component and a water-soluble component such as water or a water-soluble polymerization initiator are separately and uniformly dissolved and then the respective components are mixed can be adopted.
さらに、エマルションを形成させるための混合装置も特に制限されず、所望のエマルション粒径に応じて、通常のミキサーやホモジナイザー、高圧ホモジナイザー等の任意の装置を採用することができ、さらには、被処理物を混合容器に入れ、該混合容器を傾斜させた状態で公転軸の周りに公転させながら自転させることにより被処理物を攪拌混合する、いわゆる遊星式攪拌装置なども用いることができる。
Further, the mixing device for forming the emulsion is not particularly limited, and any device such as a normal mixer, a homogenizer, or a high-pressure homogenizer can be adopted depending on the desired emulsion particle size, and further, the object to be treated can be used. A so-called planetary stirrer or the like can also be used, in which an object is placed in a mixing container and the mixture is rotated while revolving around a revolving axis in an inclined state to stir and mix the object to be processed.
また、混合条件についても特に制限されず、所望のエマルション粒径に応じて、攪拌回転数や攪拌時間等を任意に設定することができる。なお、上記の遊星式攪拌装置では、W/Oエマルション中の水滴を均一に生成させることができ、その平均径を幅広い範囲で任意に設定することができる。
Further, the mixing conditions are not particularly limited, and the stirring rotation speed, stirring time, etc. can be arbitrarily set according to the desired emulsion particle size. In the above planetary agitator, water droplets in the W / O emulsion can be uniformly generated, and the average diameter thereof can be arbitrarily set in a wide range.
油中水滴型エマルションの重合条件は、モノマーや開始剤の種類等に応じて様々な条件を採用することができる。例えば、重合開始剤としてアゾビスイソブチロニトリルや過酸化ベンゾイル、過硫酸カリウム等を用いる場合は、不活性雰囲気下の密封容器内において、30~100℃の温度で1~48時間加熱重合すればよく、重合開始剤として過酸化水素-塩化第一鉄、過硫酸ナトリウム-酸性亜硫酸ナトリウム等を用いる場合は、不活性雰囲気下の密封容器内において、0~30℃の温度で1~48時間重合すればよい。
Various conditions can be adopted for the polymerization conditions of the water-in-oil emulsion depending on the type of monomer and initiator. For example, when azobisisobutyronitrile, benzoyl peroxide, potassium persulfate, etc. are used as the polymerization initiator, the polymerization is carried out by heating at a temperature of 30 to 100 ° C. for 1 to 48 hours in a sealed container under an inert atmosphere. When hydrogen peroxide-ferrous chloride, sodium persulfate-sodium acid sulfite, etc. are used as the polymerization initiator, the temperature is 0 to 30 ° C. for 1 to 48 hours in a sealed container under an inert atmosphere. It may be polymerized.
なお、重合終了後は、内容物を取り出して、イソプロパノール等の溶剤でソックスレー抽出を行うことにより未反応モノマーと残留界面活性剤を除去し、図2の中図に示すモノリスAを得ることができる。
After completion of the polymerization, the unreacted monomer and the residual surfactant can be removed by taking out the contents and performing Soxhlet extraction with a solvent such as isopropanol to obtain Monolith A shown in the middle figure of FIG. ..
(加水分解工程)
続いて、モノリスA(架橋重合体)を加水分解して、吸収剤Aを得る工程(加水分解工程)について説明する。 (Hydrolyzed step)
Subsequently, a step (hydrolysis step) of hydrolyzing the monolith A (crosslinked polymer) to obtain the absorbent A will be described.
続いて、モノリスA(架橋重合体)を加水分解して、吸収剤Aを得る工程(加水分解工程)について説明する。 (Hydrolyzed step)
Subsequently, a step (hydrolysis step) of hydrolyzing the monolith A (crosslinked polymer) to obtain the absorbent A will be described.
まず、モノリスAを、臭化亜鉛を加えたジクロロエタンに浸漬させて40℃で24時間撹拌し、メタノール、4%塩酸、4%水酸化ナトリウム水溶液及び水にこの順で接触させて加水分解を行った後、乾燥させてブロック状の吸収剤Aを得る。さらに、このブロック状の吸収剤Aを所定の大きさに粉砕して粒子状の吸収剤Aを得る。なお、この吸収剤Aの形態は粒子状に限定されず、例えば、乾燥させる際に又は乾燥後にシート状に成形してもよい。
First, monolith A is immersed in dichloroethane containing zinc bromide, stirred at 40 ° C. for 24 hours, and hydrolyzed by contacting it with methanol, 4% hydrochloric acid, 4% sodium hydroxide aqueous solution and water in this order. After that, it is dried to obtain a block-shaped absorbent A. Further, the block-shaped absorbent A is pulverized to a predetermined size to obtain a particulate absorbent A. The form of the absorbent A is not limited to particles, and may be formed into a sheet during or after drying, for example.
また、モノリスAの加水分解の方法は特に制限されず、種々の方法を採用することができる。例えば、トルエン、キシレン等の芳香族系溶媒、クロロホルム、ジクロロエタン等のハロゲン系溶媒、テトラヒドロフランやイソプロピルエーテル等のエーテル系溶媒、ジメチルホルムアミドやジメチルアセトアミド等のアミド系溶媒、メタノールやエタノール等のアルコール系溶媒、酢酸やプロピオン酸等のカルボン酸系溶媒または水を溶媒として、水酸化ナトリウム等の強塩基と接触させる方法、或いは、塩酸等のハロゲン化水素酸、硫酸、硝酸、トリフルオロ酢酸、メタンスルホン酸、p-トルエンスルホン酸等のブレンステッド酸または臭化亜鉛、塩化アルミニウム、臭化アルミニウム、塩化チタン(IV)、塩化セリウム/ヨウ化ナトリウム、ヨウ化マグネシウム等のルイス酸と接触させる方法などが挙げられる。
Further, the method for hydrolyzing Monolith A is not particularly limited, and various methods can be adopted. For example, aromatic solvents such as toluene and xylene, halogen solvents such as chloroform and dichloroethane, ether solvents such as tetrahydrofuran and isopropyl ether, amide solvents such as dimethylformamide and dimethylacetamide, and alcohol solvents such as methanol and ethanol. , A method of contacting with a strong base such as sodium hydroxide using a carboxylic acid solvent such as acetic acid or propionic acid or water as a solvent, or hydrohalogenate such as hydrochloric acid, sulfuric acid, nitric acid, trifluoroacetic acid, methanesulfonic acid. , P-solvented acid such as toluenesulfonic acid or Lewis acid such as zinc bromide, aluminum chloride, aluminum bromide, titanium chloride (IV), cerium chloride / sodium iodide, magnesium iodide, etc. Be done.
また、吸収剤Aの親水性の連続骨格を形成する有機ポリマーの重合原料のうち、(メタ)アクリル酸エステルとしては、特に制限されないが、(メタ)アクリル酸のC1~C10(すなわち、炭素数1~10)のアルキルエステルが好ましく、(メタ)アクリル酸のC4(すなわち、炭素数4)のアルキルエステルが特に好ましい。
なお、(メタ)アクリル酸のC4のアルキルエステルとしては、(メタ)アクリル酸t-ブチルエステル、(メタ)アクリル酸n-ブチルエステル、(メタ)アクリル酸iso-ブチルエステルが挙げられる。 Further, among the polymerization raw materials of the organic polymer forming the hydrophilic continuous skeleton of the absorbent A, the (meth) acrylic acid ester is not particularly limited, but the (meth) acrylic acid has C1 to C10 (that is, the number of carbon atoms). Alkyl esters of 1 to 10) are preferable, and C4 (that is, 4 carbon atoms) alkyl esters of (meth) acrylic acid are particularly preferable.
Examples of the C4 alkyl ester of (meth) acrylic acid include (meth) acrylic acid t-butyl ester, (meth) acrylic acid n-butyl ester, and (meth) acrylic acid iso-butyl ester.
なお、(メタ)アクリル酸のC4のアルキルエステルとしては、(メタ)アクリル酸t-ブチルエステル、(メタ)アクリル酸n-ブチルエステル、(メタ)アクリル酸iso-ブチルエステルが挙げられる。 Further, among the polymerization raw materials of the organic polymer forming the hydrophilic continuous skeleton of the absorbent A, the (meth) acrylic acid ester is not particularly limited, but the (meth) acrylic acid has C1 to C10 (that is, the number of carbon atoms). Alkyl esters of 1 to 10) are preferable, and C4 (that is, 4 carbon atoms) alkyl esters of (meth) acrylic acid are particularly preferable.
Examples of the C4 alkyl ester of (meth) acrylic acid include (meth) acrylic acid t-butyl ester, (meth) acrylic acid n-butyl ester, and (meth) acrylic acid iso-butyl ester.
また、架橋重合に用いるモノマーは、(メタ)アクリル酸エステル及びジビニルベンゼンのみであってもよいし、(メタ)アクリル酸エステル及びジビニルベンゼンに加えて、(メタ)アクリル酸エステル及びジビニルベンゼン以外の他のモノマーを含有していてもよい。
後者の場合、他のモノマーとしては、特に限定されないが、例えばスチレン、α―メチルスチレン、ビニルトルエン、ビニルベンジルクロライド、(メタ)アクリル酸グリシジル、(メタ)アクリル酸2エチルヘキシル、イソブテン、ブタジエン、イソブレン、クロロプレン、塩化ビニル、臭化ビニル、塩化ビニリデン、テトラフルオロエチレン、(メタ)アクリロニトリル、酢酸ビニル、エチレングリコールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレートなどが挙げられる。
なお、架橋重合に用いる全モノマー中の、(メタ)アクリル酸エステル及びジビニルベンゼン以外の他のモノマーの割合は、0~80モル%が好ましく、0~50モル%がより好ましい。 Further, the monomer used for the cross-linking polymerization may be only (meth) acrylic acid ester and divinylbenzene, and in addition to (meth) acrylic acid ester and divinylbenzene, other than (meth) acrylic acid ester and divinylbenzene. It may contain other monomers.
In the latter case, the other monomer is not particularly limited, but for example, styrene, α-methylstyrene, vinyltoluene, vinylbenzyl chloride, glycidyl (meth) acrylate, diethylhexyl (meth) acrylate, isobutene, butadiene, isobrene. , Chloroprene, vinyl chloride, vinyl bromide, vinylidene chloride, tetrafluoroethylene, (meth) acrylonitrile, vinyl acetate, ethylene glycol di (meth) acrylate, trimethylolpropanetri (meth) acrylate and the like.
The proportion of the monomers other than the (meth) acrylic acid ester and divinylbenzene in all the monomers used for the cross-linking polymerization is preferably 0 to 80 mol%, more preferably 0 to 50 mol%.
後者の場合、他のモノマーとしては、特に限定されないが、例えばスチレン、α―メチルスチレン、ビニルトルエン、ビニルベンジルクロライド、(メタ)アクリル酸グリシジル、(メタ)アクリル酸2エチルヘキシル、イソブテン、ブタジエン、イソブレン、クロロプレン、塩化ビニル、臭化ビニル、塩化ビニリデン、テトラフルオロエチレン、(メタ)アクリロニトリル、酢酸ビニル、エチレングリコールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレートなどが挙げられる。
なお、架橋重合に用いる全モノマー中の、(メタ)アクリル酸エステル及びジビニルベンゼン以外の他のモノマーの割合は、0~80モル%が好ましく、0~50モル%がより好ましい。 Further, the monomer used for the cross-linking polymerization may be only (meth) acrylic acid ester and divinylbenzene, and in addition to (meth) acrylic acid ester and divinylbenzene, other than (meth) acrylic acid ester and divinylbenzene. It may contain other monomers.
In the latter case, the other monomer is not particularly limited, but for example, styrene, α-methylstyrene, vinyltoluene, vinylbenzyl chloride, glycidyl (meth) acrylate, diethylhexyl (meth) acrylate, isobutene, butadiene, isobrene. , Chloroprene, vinyl chloride, vinyl bromide, vinylidene chloride, tetrafluoroethylene, (meth) acrylonitrile, vinyl acetate, ethylene glycol di (meth) acrylate, trimethylolpropanetri (meth) acrylate and the like.
The proportion of the monomers other than the (meth) acrylic acid ester and divinylbenzene in all the monomers used for the cross-linking polymerization is preferably 0 to 80 mol%, more preferably 0 to 50 mol%.
また、界面活性剤は、上述のソルビタンモノオレエートに限定されず、架橋重合用モノマーと水とを混合した際に、油中水滴型(W/O)エマルションを形成し得るものであればよい。そのような界面活性剤としては、例えば、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタントリオレエート、ポリオキシエチレン基ノニルフェニルエーテル、ポリオキシエチレン基ステアリルエーテル、ポリオキシエチレン基ソルビタンモノオレエート等の非イオン界面活性剤、オレイン酸カリウム、ドデシルベンゼンスルホン酸ナトリウム、スルホコハク酸ジオクチルナトリウム等の陰イオン界面活性剤、ジステアリルジメチルアンモニウムクロライド等の陽イオン界面活性剤、ラウリルジメチルベタイン等の両性界面活性剤が挙げられる。これらの界面活性剤は一種類を単独で用いても、二種類以上を併用してもよい。
Further, the surfactant is not limited to the above-mentioned sorbitan monooleate, and may be any one that can form a water-in-oil (W / O) emulsion when the cross-linking polymerization monomer and water are mixed. .. Examples of such surfactants include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene group nonylphenyl ether, polyoxyethylene group stearyl ether, and polyoxyethylene group sorbitan. Nonionic surfactants such as monooleate, anionic surfactants such as potassium oleate, sodium dodecylbenzenesulfonate, sodium dioctyl sulfosuccinate, cationic surfactants such as distearyldimethylammonium chloride, lauryldimethylbetaine and the like. Androgynous surfactants can be mentioned. These surfactants may be used alone or in combination of two or more.
また、重合開始剤は、熱及び光照射によりラジカルを発生する化合物が好適に用いられる。さらに、重合開始剤は、水溶性でも油溶性でもよく、例えば、アゾビス(4-メトキシ-2,4-ジメチルバレロニトリル)、アゾビスイソブチロニトリル、アゾビスジメチルバレロニトリル、アゾビスシクロヘキサンニトリル、アゾビスシクロヘキサンカルボニトリル、アゾビス(2-メチルプロピオンアミジン)ジヒドロクロライド、過酸化ベンゾイル、過硫酸カリウム、過硫酸アンモニウム、過酸化水素-塩化第一鉄、過硫酸ナトリウム-酸性亜硫酸ナトリウム、テトラメチルチウラムジスルフィドなどが挙げられる。ただし、場合によっては、重合開始剤を添加しなくても加熱のみや光照射のみで重合が進行する系もあるため、そのような系では重合開始剤の添加は不要である。
Further, as the polymerization initiator, a compound that generates radicals by heat and light irradiation is preferably used. Further, the polymerization initiator may be water-soluble or oil-soluble, and may be, for example, azobis (4-methoxy-2,4-dimethylvaleronitrile), azobisisobutyronitrile, azobisdimethylvaleronitrile, azobiscyclohexanenitrile, etc. Azobiscyclohexanecarbonitrile, azobis (2-methylpropionamidine) dihydrochloride, benzoyl peroxide, potassium persulfate, ammonium persulfate, hydrogen peroxide-ferrous chloride, sodium persulfate-sodium acid sulfite, tetramethylthium disulfide, etc. Can be mentioned. However, in some cases, the polymerization proceeds only by heating or light irradiation without adding the polymerization initiator, so that it is not necessary to add the polymerization initiator in such a system.
なお、本発明の複合吸収体は、上述の実施形態の軽失禁パッドのほかに、例えば、パンツ型使い捨ておむつ、テープ型使い捨ておむつ、生理用ナプキン、吸収ライナー、吸収パッド(例えば、褥瘡パッドや産褥パッド等)、吸収シート、母乳パッド、ペット用の使い捨ておむつ、ペット用の吸収パッド、ペット用の***物処理シート、ウェットシート、ウェットティッシュ、化粧用拭き取りシート、マスク等の様々な衛生用品に適用することができる。したがって、複合吸収体の吸収対象液である体液は、衛生用品の着用者から排出される液体であり、例えば、尿、汗、便、経血、おりもの、母乳、血液、滲出液などが挙げられる。
In addition to the light incontinence pad of the above-described embodiment, the composite absorber of the present invention includes, for example, a pants-type disposable diaper, a tape-type disposable diaper, a sanitary napkin, an absorbent liner, and an absorbent pad (for example, a decubitus pad or a decubitus pad). Applicable to various hygiene products such as (pads, etc.), absorbent sheets, breast milk pads, disposable diapers for pets, absorbent pads for pets, excrement disposal sheets for pets, wet sheets, wet wipes, cosmetic wipes, masks, etc. can do. Therefore, the body fluid to be absorbed by the composite absorber is a liquid discharged from the wearer of the sanitary goods, and examples thereof include urine, sweat, stool, menstrual blood, cage, breast milk, blood, and exudate. Be done.
また、本発明は、上述の実施形態等に制限されることなく、本発明の目的、趣旨を逸脱しない範囲内において、適宜組み合わせや代替、変更等が可能である。
Further, the present invention is not limited to the above-described embodiments and the like, and can be appropriately combined, substituted, modified, etc. within the range not deviating from the object and purpose of the present invention.
1 軽失禁パッド
2 表面シート
3 裏面シート
4 複合吸収体 1 Light incontinence pad 2Front sheet 3 Back sheet 4 Composite absorber
2 表面シート
3 裏面シート
4 複合吸収体 1 Light incontinence pad 2
Claims (6)
- 体液を吸収するための複合吸収体であって、
親水性の連続骨格及び連続空孔を備えた高分子吸収剤と、高吸収性ポリマーと、を含み、
前記高分子吸収剤は、吸収した水分の液吐出し量が20g/g以上であり、液吐出し率が65%以上であることを特徴とする複合吸収体。 A complex absorber for absorbing body fluids,
It contains a polymer absorbent with a hydrophilic continuous skeleton and continuous pores, and a highly absorbent polymer.
The polymer absorbent is a composite absorber characterized in that the amount of absorbed water discharged is 20 g / g or more and the liquid discharge rate is 65% or more. - 前記高分子吸収剤は、吸水及び離水を3回繰り返した後の繰返し液吐出し率が65%以上であることを特徴とする、請求項1に記載の複合吸収体。 The composite absorbent according to claim 1, wherein the polymer absorbent has a repeated liquid discharge rate of 65% or more after repeating water absorption and water separation three times.
- 前記高分子吸収剤から前記高吸収性ポリマーへの液移行量が5.0g/g以上であることを特徴とする、請求項1又は2に記載の複合吸収体。 The composite absorber according to claim 1 or 2, wherein the liquid transfer amount from the polymer absorbent to the highly absorbent polymer is 5.0 g / g or more.
- 前記高分子吸収剤は、モノリス状の吸収剤であることを特徴とする、請求項1~3のいずれか一項に記載の複合吸収体。 The composite absorbent according to any one of claims 1 to 3, wherein the polymer absorbent is a monolith-like absorbent.
- 前記高分子吸収剤は、(メタ)アクリル酸エステルと、一分子中に2個以上のビニル基を含有する化合物の架橋重合体の加水分解物であり、且つ、少なくとも1個以上の-COONa基を含有することを特徴とする、請求項1~4のいずれか一項に記載の複合吸収体。 The polymer absorbent is a hydrolyzate of a (meth) acrylic acid ester and a crosslinked polymer of a compound containing two or more vinyl groups in one molecule, and has at least one -COONa group. The complex absorber according to any one of claims 1 to 4, which comprises.
- 請求項1~5のいずれか一項に記載の複合吸収体を有することを特徴とする衛生用品。 A hygienic product characterized by having the complex absorber according to any one of claims 1 to 5.
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JPH08504474A (en) * | 1992-12-11 | 1996-05-14 | ザ、プロクター、エンド、ギャンブル、カンパニー | Absorbent foam material for aqueous body fluids, thin until wet and method of making same |
JP2002505702A (en) * | 1997-06-19 | 2002-02-19 | エスシーエー ハイジーン プロダクツ アーベー | Absorbent material structure, manufacturing method and use thereof, and disposable absorbent article including such a material structure |
JP2005521757A (en) * | 2002-02-06 | 2005-07-21 | ビーエーエスエフ アクチェンゲゼルシャフト | Foam material comprising water-absorbing basic polymer, process for producing the same and use of the foam material |
WO2019110787A1 (en) * | 2017-12-08 | 2019-06-13 | Essity Hygiene And Health Aktiebolag | Absorbent article and a method of producing absorbent article |
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JPH08504474A (en) * | 1992-12-11 | 1996-05-14 | ザ、プロクター、エンド、ギャンブル、カンパニー | Absorbent foam material for aqueous body fluids, thin until wet and method of making same |
JP2002505702A (en) * | 1997-06-19 | 2002-02-19 | エスシーエー ハイジーン プロダクツ アーベー | Absorbent material structure, manufacturing method and use thereof, and disposable absorbent article including such a material structure |
JP2005521757A (en) * | 2002-02-06 | 2005-07-21 | ビーエーエスエフ アクチェンゲゼルシャフト | Foam material comprising water-absorbing basic polymer, process for producing the same and use of the foam material |
WO2019110787A1 (en) * | 2017-12-08 | 2019-06-13 | Essity Hygiene And Health Aktiebolag | Absorbent article and a method of producing absorbent article |
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