TWI603720B - Absorbent articles - Google Patents

Description

Absorbent article

The present invention relates to an absorbent article comprising superabsorbent polymer particles, and more particularly to an absorbent body having a body fluid absorbent wearing article such as a disposable diaper, etc. A suitable absorbent material in the form of a gasket for use in a disposable wipe or the like.

A water-absorbent article in which a superabsorbent polymer particle is interposed between at least one of the two sheets as a water-permeable sheet is known.

For example, an absorbent sheet which is an example of an absorbent article disclosed in Japanese Laid-Open Patent Publication No. Hei 5-38350 (Patent Document 1) is formed by applying an adhesive to a sheet-like absorbent material. The polymer particles are then formed by laminating a sheet of absorbing material thereon and compressing them into an integrated manner.

In addition, the disposable wearing article described in Japanese Laid-Open Patent No. 3733220 (Patent Document 2) is provided with a water-permeable intermediate sheet positioned below the liquid-permeable surface sheet and a liquid-impermeable back sheet. A plurality of tubular portions extending in parallel with each other are formed, and a liquid absorbing material containing 5 to 98% by weight of superabsorbent polymer particles is accommodated in the tubular portion.

In the absorbent sheet described in Japanese Laid-Open Patent Publication No. 2009-131510 (Patent Document 3), the superabsorbent polymer particles are accommodated between the upper sheet and the lower sheet, and the upper sheet and the lower sheet are joined together. The non-joining portion of the joint portion is formed with a pocket by the upper sheet and the lower sheet, and the superabsorbent polymer particles are accommodated in the pocket. The superabsorbent polymer particles are in a movable state inside the pocket.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 5-38350

[Patent Document 2] Japanese Patent No. 3732320

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2009-131510

The superabsorbent polymer particles used in the above-mentioned conventional techniques are soluble components containing moisture such as urine. When the absorbent body such as disposable disposable diaper uses the highly water-absorptive polymer particles, the surface of the absorbent body after urination, the soluble component dissolved in the urine exudes, and is adhesive, and is given Sticky touch. Among the wearers such as diapers, when the skin touches the surface, the touch may cause discomfort.

On the other hand, the present invention provides a water-absorbent article which can solve such problems caused by the soluble component of the superabsorbent polymer particles.

In order to solve the above problems, the object of the invention is to provide at least one of the two sheets of the superabsorbent polymer particles interposed as water permeable. An absorbent article between the opposing faces of the two sheets of the aforementioned sheets.

According to a feature of the present invention, the superabsorbent polymer particles are such that the content of the soluble component measured by immersing in 0.9% physiological saline does not exceed 15% of the mass of the superabsorbent polymer particles.

According to one aspect of the invention, the superabsorbent polymer particles do not exceed the amount of exudation of the soluble component when absorbing 0.9% of physiological saline corresponding to the water retention ratio of the superabsorbent polymer particles. 80mg.

According to one aspect of the invention, the superabsorbent polymer particles are one of a pair of opposing faces of the sheets of the two sheets joined together via a hot melt adhesive.

According to one aspect of the invention, the article includes: a plurality of first regions in which a desired amount of the superabsorbent polymer particles is interposed between the opposing faces; and the two sheets The second region that is joined to each other, and the region may have the above-described required amount around a plurality of the first regions.

According to one aspect of the invention, the water-absorbent ratio of the superabsorbent polymer particles in the case of absorbing 0.9% physiological saline is in the range of 10 to 50 g/g.

According to one aspect of the invention, the superabsorbent polymer particles have a water absorption capacity under pressure of at least 15 g/g when absorbing 0.9% physiological saline.

In one embodiment of the invention, the water absorption speed of the superabsorbent polymer particles absorbed by 0.9% physiological saline is 1 to 50 seconds. range.

According to one aspect of the invention, at least one of the two sheets is formed of any one of a nonwoven fabric of a thermoplastic synthetic fiber and an apertured film of a thermoplastic synthetic resin, and the one of the sheets is ventilated. The resistance value is between 0.40 and 0.04KPa. The range of s/m. However, s represents second and m represents meter.

According to one aspect of the invention, the superabsorbent polymer particles are bonded to one of the opposing faces at a ratio of 30 to 300 g/m ² .

In the water absorbent article of the invention, the superabsorbent polymer particles interposed between the opposing faces of the two sheets of the laminated sheets are immersed in 0.9% physiological saline, and the measured solubleness is used. When the component content rate does not exceed 15% of the mass of the above-mentioned superabsorbent polymer particles, the amount of exudation of the soluble component can be minimized on the surface of the water absorbent article after the water absorbent article absorbs water. Thereby, the problem that the surface of the so-called absorbent article is adhesive and the feeling of discomfort to the skin contacting the surface can be eliminated.

[Formation for carrying out the invention]

The details of the water absorbent article having the gasket form of the invention will be described below with reference to the drawings.

1 and 2, FIG. 1 is a partially broken plan view of a water absorbent article 1 having a gasket form, and FIG. 2 is a view showing a cut surface of line II-II of FIG. The double-headed arrow marks A, B, and C respectively indicate the longitudinal, lateral, and thickness directions orthogonal to each other. In the drawings, the article 1 comprises: a water-permeable upper sheet 2; a lower sheet 3 which is water-permeable or water-impermeable or water-impermeable; and superabsorbent polymer particles 4. The superabsorbent polymer 4 is, for example, various types of polymers which are water-insoluble and have a water absorption of 10 times or more of their own weight, such as sodium polyacrylate, and can be used as a soluble component described later. The rate will not exceed 15% of its own weight, more ideally it will not exceed 13% of its own weight. The article 1 further includes a plurality of first joining domains 6 in which the upper sheet 2 is separated from the lower sheet 3, the super absorbent polymer particles 4 are bonded to the inner surface 3a of the lower sheet 3, and the upper sheet 2 is joined to the lower sheet 3. 2 joint domain 7. The water permeability of the lower sheet 3 means that the lower sheet 3 and the upper sheet 2 are equally easy to permeate water, and the lower sheet 3 is impervious to water, which means that the lower sheet 3 is aligned with the upper sheet 2, and the lower sheet 3 is in the absence of the upper sheet 2 In the state of transmission, the impermeability of the lower sheet layer 3 means that it is aligned with the upper sheet 2, and the lower sheet 3 is in a state in which water cannot be actually transmitted. In the lower sheet 3, any one of a water permeable, a water-impermeable, and a water-impermeable can be used depending on the use, the state of use, the production method, and the like of the article 1. In addition, in FIG. 2, in order to demonstrate the presence of the super absorbent polymer particle 4 mentioned later, the magnitude|size of the diameter of the super absorbent polymer particle 4 is exaggerated.

In FIG. 1, the first bonding region 6 is surrounded by the second bonding region 7, and the water-absorbing region is formed by containing the superabsorbent polymer particles 4 as a water-absorbent material. That is, in the first joining region 6, the superabsorbent polymer particles 4 are present in the presence region of the superabsorbent polymer particles 4 having a desired mass per unit area of the inner face 3a of the lower sheet 3. In the first bonding region 6, the superabsorbent polymer particles 4 are polymerized by the same ratio as the entire lower layer 3 at a ratio of 30 to 300 g/m ² , more preferably 40 to 280 g/m ² . The material particle fixing hot-melt adhesive 11 is bonded to the lower layer sheet 3. However, the first bonding domain 6 may also include a domain of superabsorbent polymer particles that are not bonded to the lower layer sheet 3, and the first bonding domain 6 may contain superabsorbent polymer particles between the lower layer sheet 3 and the upper layer sheet 2. The upper limit of the total amount of 4 is 400 g/m ² . In the first joining region 6, it is preferable that the inner surface 3a of the lower sheet 3 and the inner surface 2a of the upper sheet 2 as the opposing surface of the inner surface 3a are not joined, but the article 1 may be manufactured (see FIG. 3, 4) Although there is no intention, the upper sheet 2 may still be joined to the lower sheet 3 with a very small area.

When the superabsorbent polymer particles 4 contained in the first joining region 6 are not bonded to the hot-melt adhesive 11 for fixing the polymer particles and are freely movable, the second joining region 7 is prevented from being highly absorbent. The domain in which the polymer particles 4 are detached from the first joining region 6, that is, the region surrounding the first joining region 6 is sealed, and the water absorbing material is not contained or the upper sheet 2 is formed when the water absorbing material is formed. The manufacturing process of the lower sheet 3 and the article 1 is not intended to form a domain of a substantially non-absorbent domain that does not contain a water-absorbent material, in addition to the superabsorbent polymer particles 4 of up to 20 g/m ² being mixed. This invention also refers to this as the non-existing domain of the superabsorbent polymer particles 4 which does not contain the desired mass of the superabsorbent polymer particles 4 per unit area of the underlying sheet 3. In other words, even if the second bonding domain 7 contains the superabsorbent polymer particles 4, the mass per unit area (g/m ² ) of the superabsorbent polymer particles 4 is the unit area of the lower layer sheet 3 . The amount of mass (g/m ² ) per unit area of the superabsorbent polymer particles 4 contained in the first joining region 6 is smaller. In the second joining region 7, the upper sheet 2 and the lower sheet 3 are joined via a heat seal adhesive 12 for sealing. However, the article 1 is further fused by the upper sheet 2 and the lower sheet 3 thus joined, so that the peeling strength of the sheets 2 and 3 can be improved. In any case, in the second joining zone 7, the upper sheet 2 and the lower sheet 3 are in a state of not peeling off even when the article 1 is used. In addition, in the article 1 illustrated in FIG. 2, the polymer particle-fixing hot-melt adhesive 11 to be applied in the second joining region 7 and the second hot-melt adhesive 102 to be described later (see FIGS. 3 and 4) The sealing hot-melt adhesive 12 is formed, and the upper sheet 2 is bonded to the lower sheet 3 via the sealing hot-melt adhesive 12. These hot melt adhesives in article 1 can be used by the idioms of such articles.

The article 1 of the illustrated example is made longitudinal A long. In the longitudinal direction A, the first joint region 6 of the eight regions indicated by reference symbols 6a to 6h, that is, the water absorption region is arranged. Each of the first joining domains 6a to 6h has a periphery 61 that is formed into a planar shape. In the longitudinal direction A, the peripheral portion 61 of the adjacent first joining domains 6 includes a side portion 62 that faces in the longitudinal direction A and extends in the lateral direction B. For example, in the peripheral 61 of the adjacent first joining domains 6a and 6b in Fig. 1, the opposite side portions 62 which face each other in the longitudinal direction A and extend in the lateral direction B are indicated by reference numerals 62a and 62b.

In the article 1, the second joining domain 7 has: side edge portions 7a extending toward the longitudinal direction A on both sides of the article 1, positioned at both ends of the article 1, facing horizontally Both end edges 7b extending toward B; and an intermediate portion 7c extending in the lateral direction B between the adjacent first joining domains 6 in the longitudinal direction A. The intermediate portion 7c is a portion which can be referred to as a groove formed between the adjacent first joining regions 6 as seen in Fig. 2, and the dimension W of the longitudinal direction A is the width of the groove.

When the article 1 of this type is used as an absorbent body for a disposable diaper or a urine absorbing pad for incontinence patient pants, the longitudinal direction A of the article 1 is aligned with the front-rear direction of the diaper, and the center portion of the longitudinal direction A is disposed. In the underarms of the diaper. The upper sheet 2 is formed by a water permeable sheet and faces the skin of the wearer of the diaper.

In the diaper, by using the article 1, the possibility of obtaining various effects is enhanced. For example, the urine excreted by the wearer passes through the upper sheet 2 in the first joining region 6, and the superabsorbent polymer particles 4 are absorbed to form no flow. In the diaper, the superabsorbent polymer particles 4 are fixed by the lower layer sheet 3 formed of the water-impermeable or water-impermeable sheet, and the wearer's crotch portion is changed even when the wearer's posture is changed to various postures. The distribution state of the superabsorbent polymer particles 4 in the medium is always constant, and there is no offset in the inside of the first joining zone 6. Therefore, in the article 1, urine can be transmitted through the wide range of the upper sheet 2, and is absorbed in a wide range of the first joining region 6. In addition, in the first joining region 6, the distribution of the superabsorbent polymer particles 4 is shifted, and the article 1 has a different thickness, so that the article 1 does not partially press the wearer's skin. . In the first joining region 6, since the hot-melt adhesive 11 for fixing the polymer particles is applied to the lower sheet 3, the upper sheet 2 is not coated, so that the hot-melt adhesive 11 for fixing the polymer particles does not interfere with the upper sheet 2 Through Water-based. The super absorbent polymer particles 4 fixed to the lower sheet 3 are in contact with the lower sheet 3 coated with the hot-melt adhesive 11 for fixing the polymer particles, and the upper sheet 2 is prevented from coming into close contact with each other, and the upper sheet 2 is bonded to the upper sheet 2 The lower sheet 3 prevents the article 1 from becoming a poorly-leaked person. In the article 1 disposed in the crotch region of the diaper, as shown in the example, the plurality of intermediate portions 7c parallel to each other act to make the bending in the longitudinal direction A of the article 1 easy. It is preferable that the width W of the intermediate portion 7c thus functioning is 2 to 15 mm.

In an example of the article 1 when the diaper is used, a sheet of a water-permeable non-woven fabric formed of a thermoplastic synthetic fiber and hydrophilized by a thermoplastic synthetic fiber can be used, for example, a hydrophilized treatment formed of a polypropylene fiber. It is used in the state of the sheet of SMS non-woven fabric (spunbond-meltblown-spun non-woven fabric). In an example of the SMS non-woven fabric, a melt-blown nonwoven fabric having a mass ratio of 0.5 to 2 g/m ² is interposed in a mass per unit area of a spunbonded nonwoven fabric having a mass ratio of 4 to 5 g/m ² . It is a non-woven fabric of 10~12g/m ² . Further, in the upper sheet 2, a laminate having a two-layer structure having a laminate of a spunbonded nonwoven fabric treated by hydrophilization and a hydrophilized SMS nonwoven fabric (see Fig. 5) can be used. In the upper sheet 2, a water permeable open-cell plastic film can also be used in place of the water-permeable non-woven fabric.

In the lower sheet 3, a sheet of a water-impermeable or water-impermeable nonwoven fabric formed of a hydrophobic thermoplastic synthetic fiber can be used. For example, a melt-blown nonwoven fabric having a mass of a ratio of 0.5 to 2 g/m ² may be used in a per-unit area between the spunbonded nonwoven fabrics having a mass ratio of 4 to 6 g/m ² formed of polypropylene fibers. A sheet of water-impermeable SMS non-woven fabric having a mass of 10 to 13 g/m ² . In the lower sheet 3, a water-impermeable sheet formed of a plastic film such as a polyethylene film having a thickness of 0.01 to 0.03 mm, a water-permeable plastic film formed of a water-impermeable plastic film and a thermoplastic synthetic fiber may be used. A water-impermeable sheet of a non-woven laminate. In the laminate, the non-woven fabric becomes the inside of the article 1, the water-impermeable plastic film becomes the outer side of the article 1, the non-woven fabric bonds the superabsorbent polymer particles 4, and the plastic film prevents the body fluid from the fiber gap in the nonwoven fabric. The leak is ideal (see Figure 5).

In the superabsorbent polymer particles 4, the content of the soluble component measured by the method for measuring the content of the soluble component described later does not exceed 15%, and more preferably does not exceed 13%. When the water-absorbent polymer particles 4 are in contact with moisture such as urine, the soluble component of the moisture oozes out to the surface of the upper sheet 2 of the article 1 together with the moisture, and the surface thereof is changed to be adhesive. Sticky tactile surface. The wearer of the diaper using the article 1 is a case where the skin feels strongly uncomfortable when it comes into contact with such a surface. Therefore, in the article 1, by limiting the content of the soluble component in the superabsorbent polymer particles 4, the amount of the component eluted with the urine excreted in the article 1 is lowered, and the surface of the upper sheet 2 is prevented from being carried. Adhesive.

The superabsorbent polymer particles 4 are preferably those having a water retention ratio measured by a method described later in the range of 10 to 50 g/g. The superabsorbent polymer particles having a water retention ratio of less than 10 g/g are used in the article 1 to secure the amount of water absorption per unit area, and the amount of the superabsorbent polymer particles per unit area is increased. The particles that cannot be joined in the first joining domain 6 become too much. In such an item 1, it is necessary to exert its inherent The effect of the function becomes difficult, or there may be a person who feels bad wearing. Further, when the water retention ratio exceeds 50 g/g, the gel strength is lowered by the large amount of water absorbed, and when external pressure is applied, the water originally absorbed by the particles is likely to be released.

However, when the article 1 is used, the superabsorbent polymer particles 4 can absorb more water such as urine even under the external pressure acting on the article 1. Therefore, in the superabsorbent polymer particles 4, the water absorption ratio under pressure under pressure of at least 15 g/g according to the measurement method described later is used.

The superabsorbent polymer particles 4 are preferably further used in a range of from 1 to 50 seconds in accordance with the VORTEX method specified in JIS K 7224. In the article 1 using the superabsorbent polymer particles 4 having a water absorption speed of more than 50 seconds, the upper layer 2 is permeated, and the backflow of water which has not been absorbed by the superabsorbent polymer particles 4 is likely to occur.

In the specific example of the article 1, the superabsorbent polymer particles 4 having a water absorption speed of about 30 seconds according to the VORTEX method can be used as an upper limit of 400 g/m ² . However, the amount of the superabsorbent polymer particles 4 to be used is preferably adjusted in consideration of the width of the division of the first joining region 6 and the use form of the article 1.

In the hot-melt adhesive 11 for fixing the polymer particles, the lower layer sheet 3 in the first joining region 6 is applied to fix the super absorbent polymer particles 4 to the lower sheet 3, but the second joining region 7 is applied. The lower layer 3 in the middle can also be coated. For example, in FIG. 2, the hot-melt adhesive 11 for fixing the polymer particles is applied at a ratio of 1 to 12 g/m ^{2 so} that the entire inner surface 3a of the lower sheet 3 is uniformly distributed. The super absorbent polymer particles 4 of the lower sheet 3 fixed in the first joining region 6 are heat-welded for fixing the polymer particles so as not to cover the entire surface of the surface by the hot-melt adhesive 11 for fixing the polymer particles. The coating amount of the coating agent 11 per unit area is extremely small. In the case where the lower layer sheet 3 can be applied to the lower layer sheet 3 in a dot shape or a bead shape so as to be intermittently distributed, the coating layer can be applied so as to continuously cover the entire first joining region 6 . However, in any case, the surface of the superabsorbent polymer particles 4 is adhered to the inner surface 3a by the hot-melt adhesive 11 for fixing the polymer particles, and the portion facing the inner surface 3a of the lower sheet 3 is bonded to the inner surface 3a. On the other hand, the portion facing the inner surface 2a (see FIG. 2) of the upper sheet 2 is not covered with the hot-melt adhesive 11 for fixing the polymer particles, and is preferably in a state in which urine can be quickly absorbed.

The heat-sealing adhesive 12 for sealing is additionally applied to the polymer particle fixing hot-melt adhesive 11 applied to the lower sheet 3 located in the second joining region 7 at a ratio of 5 to 30 g/m ² . The second hot melt adhesive 102 is formed. By adjusting the coating amount of the hot-melt adhesive in the first joining region 6 and the second joining region 7 as described above, it is possible to prevent the hot-melt adhesive agent 11 for polymer particle fixing from being widely coated and highly absorbent in the first joining region 6. The surface of each of the polymer particles 4 affects the water absorption amount and the water absorption speed of the super absorbent polymer particles 4, and on the other hand, when the second bonding region 7 has only the hot-melt adhesive 11 for fixing the polymer particles. When the amount of the adhesive applied is small, and the peeling of the upper sheet 2 and the lower sheet 3 cannot be surely prevented, peeling can be prevented by the heat-sealing adhesive 12 for sealing. When the superabsorbent polymer particles 4 which are not fixed to the lower sheet 3 in the second joining region 7 are present in the first joining region 6, it is preferable to continue in a state along the circumference of the first joining region 6, or actually In the continuous state, it is preferable that the upper layer sheet 2 and the lower sheet 3 are bonded by the sealing hot-melt adhesive 12, and the superabsorbent polymer particles 4 can be prevented from moving from the first joining region 6 to the second joining region 7. . The hot-melt adhesive 11 for fixing the polymer particles to be used as described above and the hot-melt adhesive 12 for sealing can be used in the same manner. In addition, when the polymer particle fixing adhesive 11 applied to the second joining region 7 functions as the sealing hot-melt adhesive 12, the second hot-melt adhesive 102 in Fig. 4 is not required. At this time, the coating amount per unit area of the hot-melt adhesive 11 for fixing the polymer particles may be the same in the first joining region 6 and the second joining region 7 .

As the lower sheet 3, a plastic film may be used instead of a non-woven fabric. However, when a plastic film is used, in order to bond the superabsorbent polymer particles 4 to the plastic film, the polymer particles must be thermally welded. The case where the coating amount of the agent 11 is increased. In such a case, it is easy to form a surface in which the surface of the superabsorbent polymer particles 4 is largely covered by the hot-melt adhesive 11 for fixing the polymer particles.

The dimensions of the longitudinal direction A and the lateral direction B of the first joint region 6 in the article 1 used in the diaper, that is, the dimensions of the longitudinal direction A and the transverse direction B of a division in Fig. 1 can be appropriately set according to the size of the diaper. However, as an example, the range of 25 to 100 mm and 150 to 250 mm can be set, and the number of divisions of the first joining region 6 in such a size is preferably 5 to 15. The width of the side edge portion 7a and the edge portion 7b of the second joining region 7 is preferably 5 to 30 mm.

3 and 4 are an example of a drawing when the article 1 is continuously manufactured; and a partially enlarged view of the suction pipe 130 in the drawing. In FIG. 3, the first web 131 which is a continuous body of the upper sheet 2 is supplied to the circumferential surface 135 of the suction tube 130 from the right side of the figure. The first web 131 that is in close contact with the circumferential surface 135 by the pressing action by the guide roller 141 and the suction action from the circumferential surface 135 toward the inside of the suction cylinder 130 is provided above the suction cylinder 130. The polymer particle supply device 136 supplies the superabsorbent polymer particles 4.

From the left side of the figure, the second web 132 which is a continuous body of the lower sheet 3 is continuously supplied to the circumferential surface 135 of the suction cylinder 130 via the guide rolls 142. On the one surface of the second web 132, the first hot-melt adhesive 101 is applied by the first coating 121 provided on the upstream side of the suction tube 130. Next, the second hot-melt adhesive 102 is applied onto a part of the first hot-melt adhesive 101 that has been applied by the second coating 122 provided on the downstream side of the first coating 121.

The first web 131 to which the superabsorbent polymer particles 4 are supplied and the second web 132 to which the first and second hot-melt adhesives 101 and 102 are applied are joined together on the peripheral surface 135 of the suction tube 130. Then, the first hot melt adhesive 101 is bonded to the second hot melt adhesive 102 to form a composite 137. The composite 137 is intermittently cut into individual articles 1 by the cutter 138. The first hot-melt adhesive 101 is the hot-melt adhesive 11 for fixing the polymer particles in the article 1, but the second hot-melt adhesive 102 may be integrated with the second hot-melt adhesive 102. The hot-melt adhesive 12 for sealing in the article 1. The details of the process of forming the composite 137 are as shown in FIG.

4 shows a state in which the first fiber web 131 and the second fiber web 132 merge to form a composite body 137, and the suction tube 130 is shown in a cross-sectional view. On the circumferential surface 135 of the suction tube 130, a plurality of concave portions 141 are formed to be arranged in the circumferential direction. The planar shape of one of the concave portions 141 corresponds to the planar shape of each of the first joining regions 6 arranged in the longitudinal direction A in Fig. 1 . The depth of the concave portion 141 is set to such an extent that the supply amount of the superabsorbent polymer particles 4 intermittently supplied from the polymer supply device 136 can be accommodated. In the concave portion 141, the first fiber web 131 placed on the circumferential surface 135 is deformed so as to be imitated by the suction portion 141 toward the inner side of the suction tube 130. The highly water-absorptive polymer particles 4 supplied from the polymer particle supply device 136 toward the concave portion 141 are accommodated in the deformed portion of the first fiber web 131. In the circumferential surface portion 135a at the position of the ridge portion between the adjacent concave portions 141 and 141 in the circumferential surface 135, the first fiber web 131 and the second fiber web 132 merge, and when the two fiber webs 131 and 132 pass the first pressure In the case of the roller 143, the composite body 137 is formed by press-engaging the circumferential surface portion 135a and the first pressure roller 143. After the composite body 137 is moved away from the suction tube 130 in the machine direction MD, the pair of second pressure rollers 144 are pressed, and the superabsorbent polymer particles 4 are surely brought into contact with the first hot-melt adhesive 101. The first hot-melt adhesive 101 fixes the super absorbent polymer particles 4 to the second web 132. Further, in FIG. 3, the composite body 137 enters between the pair of second pressure rollers 144 in an inclined state with respect to the machine direction MD indicated by the horizontal arrow mark, but the composite body 137 which is separated from the suction cylinder 130, The first pressure roller 144 is entered between the first pressure web 144 and the second fiber web 132 in a substantially horizontal state. It is more desirable to disperse in a state close to the level.

In the article 1 thus formed, the first hot-melt adhesive 101 can be intermittently applied to the respective joining regions of the first joining region 6 and the second joining region 7 in the longitudinal direction A and the lateral direction B. In other words, a state of continuous coating may be formed with respect to at least one of the longitudinal direction A and the lateral direction B. Therefore, there is no particular limitation on the selection of the type of the first coating 121 for applying the first thermal fusion adhesive 101, and the same applies to the second thermal fusion bonding agent 102. However, in the article 1, the hot-melt adhesive 11 for fixing the polymer particles in the first joining region 6 and the hot-melt adhesive 12 for sealing in the second joining region 7, the two hot-melt adhesives 11 and 12 are It is in a continuous state, but even if it is not a continuous state, it is desirable to be close to each other with a distance of not more than 5 mm. When the hot-melt adhesive 11 for fixing the polymer particles is applied as described above and is formed so as to extend over the respective corners of the first joining region 6, the superabsorbent polymer particles 4 are formed so as to extend over the respective corners of the first joining region 6. For example, the superabsorbent polymer particles 4 may be distributed along the opposite side portions 62 inside the opposite side portions 62 of the first joining region 6. It is preferable that the superabsorbent polymer particles 4 are distributed in the first joining region 6 so as to substantially cover the entire inner surface 3a of the underlying sheet 3 (see FIG. 2), and the superabsorbent polymer particles 4 are distributed in the first joint. The region 6 prevents the upper sheet 2 and the lower sheet 3 from being joined via the hot-melt adhesive 11 for fixing the polymer particles.

It is preferable that the total amount of the super absorbent polymer particles 4 in the article 1 and the first joining region 6 is bonded to the inner surface 3a of the lower sheet 3, and it is preferable that the superabsorbent polymer is not bonded to the lower sheet 3. Particle 4 The invention can also be carried out when it is mixed in the first joining region 6 in a state in which it can move between the lower sheet 3 and the upper sheet 2. In order to accommodate the superabsorbent polymer particles 4 in the first joining region 6 in such a state, the upper sheet 2 and the lower sheet 3 when the nonwoven fabric is formed are fibers in which the super absorbent polymer particles 4 do not easily enter the nonwoven fabric. It is ideal for gaps, or those that do not easily pass through the fiber gap. When such a non-woven fabric is selected, it is confirmed that the superabsorbent polymer particles 4 are vibrated in a state where they are scattered on the non-woven fabric by visual observation, and the particles 4 do not enter the fiber gap in the non-woven fabric. However, you can also choose to use a ventilation resistance value of 0.40~0.04KPa. s / m, more ideally in the range of 0.30 ~ 0.05KPa. A non-woven fabric of a range of s/m replaces the non-woven fabric selected in this manner. The non-woven fabric tends to have a smaller gap between the fibers which form the non-woven fabric with a higher ventilation resistance value. The value of the ventilation resistance which is an index when the non-woven fabric is selected is a value measured by a KES-FB air permeability tester manufactured by Kadodo Co., Ltd., Japan.

Further, in the article 1, the shape of the article 1, the shape of the first joining region 6, and the number of the regions formed by the first joining region 6 are not particularly limited, and the shapes and the numbers in the example of the drawing can be applied. Make appropriate changes. For example, the shape of the second joining zone 7 can be changed. The article 1 of FIG. 1 divides the first joining zone 6 into two equal parts or three equal parts in the lateral direction B.

Further, in the article 1, the second superabsorbent polymer particles (not shown) having a different water absorption rate from the superabsorbent polymer particles 4 can be mixed in the first joining region 6. For example, in the superabsorbent polymer particles 4 bonded to the lower sheet 3, the water absorption speed AS ₁ of the VORTEX method is 3 seconds, and the water absorption speed AS ₂ of the second superabsorbent polymer particles using the VORTEX method is 30. In the second layer, the second superabsorbent polymer particles are bonded to the upper sheet 2 in the first joining region 6 via the second polymer particle fixing hot-melt adhesive (not shown), or may not be bonded to the upper layer. The sheet 2 is also mixed into the first joining region 6 without being joined to the lower sheet 3 in a freely movable state. Thus, the superabsorbent polymer particles having the rapid water absorption speed AS ₁ are in the vicinity of the lower sheet 3, and the second superabsorbent polymer particles having the slow water absorption rate AS ₂ are located in the vicinity of the upper sheet 2, and are used. When the upper sheet 2 is in contact with the article 1 of the skin, the urine excreted in the initial stage of wearing the diaper can be worn from the diaper before the second superabsorbent polymer particles absorb the urine and form a rubber block. The superabsorbent polymer particles 4 which are away from the skin absorb most of the urine, keep the urine away from the skin, and can excrete urine after being absorbed by the second superabsorbent polymer particles located in the vicinity of the skin. It is prevented from giving a strong moist feeling to the wearer of the diaper due to the initial urine. However, the mass of the superabsorbent polymer particles contained in the first joining region 6 is preferably such a mass that the superabsorbent polymer particles 4 and the second superabsorbent polymer particles do not exceed 400 g/m ² . In the second superabsorbent polymer particles, the content of the soluble component is not more than 15%. Further, the second superabsorbent polymer particles are further used in a range in which the water retention ratio is in the range of 10 to 50 g/g, the water absorption ratio under pressure is at least 15 g/g, and the water absorption speed is in the range of 1 to 50 seconds.

Fig. 5 is a view similar to Fig. 1 showing an example of an embodiment. In the article 1 of Fig. 5, the upper sheet 2 is formed by the first upper sheet 21 and the second upper sheet 22 which are superposed on each other, and the lower sheet 3 is overlapped by the first lower sheet 31 and the second lower sheet 32. Formed. The first upper sheet 21 is a user who is in contact with the first lower sheet 31 and is held to cover the super absorbent polymer particles 4, and an example thereof is the same as the upper sheet 2 in Fig. 1 . Further, it is formed of a thermoplastic synthetic fiber obtained by hydrophilization treatment, and has a water-permeable non-woven fabric having a mass per unit area of 10 to 12 g/m ² . In the first upper sheet 21, similarly to the upper sheet 2 of Fig. 1, the first joining region 6 and the second joining region 7 are formed. In the second upper sheet 22, when the article 1 is used in a disposable diaper or the like, the first upper sheet 21 is covered and protected, and in the case of the second upper sheet 22, there is an area per unit area. A water-permeable spunbonded nonwoven fabric having a mass of 10 to 25 g/m ² after hydrophilization treatment. The first upper sheet 21 and the second upper sheet 22 are joined by a hot-melt adhesive 36 intermittently applied to the first upper sheet 21 or the second upper sheet 22. However, the first upper sheet 21 and the second upper sheet 22 may be separated from each other in the peripheral region 38 of the first joining region 6. In Fig. 2, the groove-shaped intermediate portion 7c is a portion included in the peripheral region 38 thereof.

In the first lower layer sheet 31 of the lower sheet 3, the superabsorbent polymer particles 4 are joined via a hot-melt adhesive 11 for polymer particle application (see FIGS. 1 and 2) coated thereon. The first lower sheet 31 is joined to the first upper sheet 21 via the heat seal adhesive 12 for sealing. In the first lower sheet 31, a nonwoven fabric or a plastic film may be used. However, in the illustrated example, a polypropylene fiber obtained by hydrophilization treatment is used, and the mass per unit area is 10 g/m ² . SMS is not woven. The second lower layer 32 of the lower sheet 3 is used to make the outer surface side of the article 1 leakproof, and a polyethylene film having a thickness of 15 μm is used as an example. The first lower sheet 31 and the second lower sheet 32 are joined via a hot-melt adhesive 37 applied to the second lower sheet 32.

The second upper sheet 22 and the second lower sheet 32 are formed to be substantially the same size, and are overlapped with a portion extending from the peripheral edge of the first upper sheet 21 and the first lower sheet 31 joined to each other via the hot-melt adhesive 36. And/or 37 are joined to each other.

When the diaper having the article 1 having the laminated structure thus formed is used, for example, when the urine is absorbed, even if the eluted component contained in the superabsorbent polymer particles 4 oozes out together with the urine on the surface of the first upper sheet 21, not only does it not When the eluted component comes into contact with the skin of the diaper wearer immediately by the presence of the second upper sheet 22, the eluted component may flow away from the skin when it flows toward the peripheral region 38 of the first joining region 6. There is less chance of contacting the skin with the eluted component. Therefore, in the article 1, the uncomfortable tactile sensation caused by the adhesion of the surface of the so-called second upper sheet 22 can be made slight or eliminated.

Figs. 6 and 7, Fig. 6 is a view similar to Fig. 5 showing an article 1 as an example of an embodiment, and Fig. 7 is a view showing a cut surface taken along line VII-VII of Fig. 6.

The article 1 in Fig. 6 has a laminated structure substantially the same as that of the article 1 in Fig. 5, the upper sheet 2 is formed by the first upper sheet 21 and the second upper sheet 22, and the lower sheet 3 is formed by the first lower layer The sheet 31 and the second lower sheet 32 are formed. Between the first upper sheet 21 and the first lower sheet 31, a first bonding region 6 in which the super absorbent polymer particles 4 are bonded to the first lower sheet 31 via the polymer particle fixing hot-melt adhesive 11 is formed; And the first upper sheet 21 and the first lower sheet 31 are via The second bonding region 7 joined by the hot-melt adhesive 12 is sealed. However, in the article 1 of Fig. 6, the rectangular first joint region 6 is formed with only one partition, and the first joint region 6 has a longitudinal dimension M and a lateral dimension N.

In the present invention, an example in which the amount of the soluble component contained in the superabsorbent polymer particles 4 oozes on the surface of the upper sheet 2 is measured, and in FIGS. 6 and 7, the article 1 having a size M and N of 10 cm is used for measurement. Item 1 is used. Further, in the article 1 for measurement, a spunbond-meltblown-spun non-woven fabric (SMS non-woven fabric) formed by a hydrophilized polypropylene fiber is used for the first upper sheet 21 and the first lower sheet 31, And the mass per unit area is 10g/m ² . The spunbonded nonwoven fabric in the SMS non-woven fabric has a mass of 4 to 4.5 g/m ² , and the melt blown nonwoven fabric has a mass of 1 to 2 g/m ² . Moreover, the polypropylene fiber used in the spunbonded nonwoven fabric has a fineness of 1.4 dtex, and the polypropylene fiber in the melt-blown nonwoven fabric has a fineness of 0.03 to 0.09 dtex. The second upper sheet 22 in the article 1 was formed by a polypropylene fiber having a fineness of 2.8 dtex, and was used in a state of a spunbonded nonwoven fabric having a mass per unit area of 18 g/m ² after the hydrophilization treatment. .

The ventilation resistance values of the first upper sheet 21 and the first lower sheet 31 thus formed are 0.0595 KPa for the average of the five sheets. s / m, the average value of the ventilation resistance value of the second upper sheet 22 is 0.0176 KPA. s/m.

The hot-melt adhesives 11, 36, and 37 used for the article 1 for measurement were applied using a spiral nozzle machine. Coating amount of the first hot-melt adhesive 11 is 10g / m ^2, a hot melt adhesive 36 is 5g / m ^2, a hot melt adhesive 37 is 10g / m ^2. In the hot-melt adhesive agent 36, the operating condition of the spiral nozzle machine is adjusted so that the coating area ratio for the first joining region 6 is 15 to 25%, and specifically, the coating area ratio for the second upper sheet 22 is 15 ~25% of the way, without interfering with the permeation of the urine of the upper sheet 2 by the hot melt adhesive 36.

In addition, in the measurement of the coating area ratio of the hot-melt adhesive 36 in the second upper sheet 22, a uniformity tester FMT-MIII manufactured by Nomura Co., Ltd., Japan was used. When the coating area ratio is measured, the black powdered carbon powder is sprayed on the hot-melt adhesive 36 applied to the second upper sheet 22 for measurement, and the hot-melt adhesive 36 is colored. When the toner is blown, the carbon powder adhering to the nonwoven fabric forming the second upper sheet 22 is removed by blowing it with pressurized air. The tester is used under the condition that the camera correction sensitivity is set to 100%, the moving element is set to 1, and the effective size is set to 10 x 10 cm. In the first bonding region 6 of the second upper sheet 22 for measurement, light is irradiated from the side of the skin contact surface in the sheet 22, and on the other hand, the heat-welding adhesive 36 as the opposite surface is provided by the tester. The amount of transmitted light of the entire first joining region 6 was measured on the side of the coated surface, and the ratio of the amount of transmitted light to the amount of light to be irradiated was calculated as the average light transmittance (%). Image analysis is performed on the opposite surface of the tester to determine the total area of the portion where the light transmittance is less than 10% or more than the average light transmittance by the carbon powder, and the first joint region 6 is The ratio of the area of 100 cm ² to the total area is taken as the coating area ratio of the hot-melt adhesive 36.

Fig. 7 shows, by imaginary line, 10 × 10 cm of synthetic leather (product number PBZ13001, manufactured by Nippon Ignition Co., Ltd.) 81 placed on the second upper sheet 22; and 10 × 10 cm of acrylic joined to the synthetic leather 81. The resin plate 82; and the pressurizing unit 80 formed by the weight 83 placed on the acrylic resin plate 82. The pressurizing unit 80 is adjusted to have a mass of 3.5 kg per 100 cm ² .

When the amount of exudation of the soluble component of the superabsorbent polymer particles 4 is measured using the article 1 for measurement according to FIGS. 6 and 7, the water retention ratio and the water retention ratio are measured in advance for each of the superabsorbent polymer particles 4 to be measured. The content of the dissolved component. In the article 1 of Fig. 6, the mass of the superabsorbent polymer particles 4 to be measured is defined so that the water absorption amount equal to the water retention ratio of the superabsorbent polymer particles 4 in the first joining region 6 is 4000 g/m ² . For example, when the amount of exudation of the superabsorbent polymer particles 4 having a water retention ratio of 40 g/g is measured, the superabsorbent polymer is used in the first bonding domain 6 of Fig. 6 in the ratio shown by the following formula. Item 1 of particle 4.

(4000 g/m ² ) / (40 g / g) = 100 g / m ²

The order of measuring the amount of bleeding of the soluble component of the article 1 is as follows.

(1) At least nine articles 1 are placed on a horizontal plate in a room having a temperature of 20 ° C and a relative humidity of 75%.

(2) Artificial urine of a mass corresponding to the water retention ratio of the superabsorbent polymer particles 4 is gradually injected into the first joining region 6 of the article 1 to allow the superabsorbent polymer particles 4 to be absorbed. The following components are used in artificial urine. That is, it contains 2% by mass of urea, 0.8% by mass of sodium chloride, and nitric acid. An aqueous solution of 0.08 mass% of magnesium hydrate and 0.03 mass% of calcium chloride hydrate.

(3) Thereafter, the article 1 was placed in a polyethylene bag and sealed, and allowed to stand in a room at 35 °C. Further, the acrylic resin 82 of the synthetic leather 81 is weighed and the mass X is obtained.

(4) After each hour, 3 hours, and 6 hours, each of the three articles 1 after standing was taken out, and the amount of exudation was measured in the order of (5) to (8) below.

(5) The article 1 taken out was placed on a horizontal plate in a room having a temperature of 20 ° C and a relative humidity of 75%.

(6) The pressurizing unit 80 (refer to Fig. 7) was placed on the article 1 for 1 minute.

(7) Thereafter, the acrylic resin plate 82 of the synthetic leather 81 is joined to the scale to obtain the mass Y.

(8) The amount of exudation Z of the soluble component adhering to the synthetic leather 82 from the article 1 is obtained by the following formula.

Z=Y-X

The water retention ratio of the superabsorbent polymer particles 4 used for such measurement was measured by the following procedure.

(1) The superabsorbent polymer particles of mass W ₀ (g) were placed in a bag of nylon mesh, and immersed in 1 liter of 0.9% physiological saline for 1 hour.

(2) After hanging the bag for 15 minutes to remove moisture, use The centrifuge was treated at 850 rpm for 90 seconds.

(3) The processed mass W ₁ (g) is obtained, and the water retention ratio H is calculated by the following formula.

H=(W ₁ -W ₀ )/W ₀

Tables 1 and 2 show commercially available superabsorbent polymer particles (SAP-A, B, C, D, and E) having different water retention ratios, and the water retention ratio and soluble components of each superabsorbent polymer particle were measured. The results of the content rate, the water absorption ratio under pressure, the water absorption speed, and the amount of bleeding of the soluble component; and the results of evaluating the tactile sensation of the synthetic leather exuded by the soluble component.

The measurement method of the soluble component content rate and the water absorption magnification under pressure in Tables 1 and 2 is as follows. The method of measuring the water retention ratio, the water absorption speed, and the ventilation resistance value is as described above.

Method for measuring the content of soluble components

As an example, the table is a measurement method using 2.0 g of superabsorbent polymer particles and 500 g of 0.9% physiological saline as described below.

(1) Measurement environment

Room temperature: 23±2°C

Relative humidity: 75±3%

(2) Apparatus

100ml glass beaker 2

Glass beaker No.1: mass a ₁ g

Glass beaker No. 2: mass a ₂ g

500ml glass beaker 1

0.9% saline solution

Magnetic stirrer

(3) Measurement order

a. Place 500 g of 0.9% physiological saline in a 500 ml beaker.

b. Rotate the magnetic stirrer at 600 rpm and stir 0.9% physiological saline.

c: 2.0 g of superabsorbent polymer particles were added, 0.9% physiological saline of the order b was added, and stirring was carried out for 3 hours.

d. A mixture of superabsorbent polymer particles and 0.9% physiological saline was filtered through a sieve having an opening of 75 μ, and the filtrate was recovered.

e. Aspirate the filtrate with ADVANTEC No. 6 filter paper and filter it to recover about 100 ml of the filtrate.

f. Transfer about 80 ml of the recovered filtrate to a glass beaker No. 1 and weigh to obtain the correct mass (bg) of the filtrate.

g. Place about 80 g of 0.9% physiological saline in a glass beaker No. 2 to obtain the correct mass (cg) of 0.9% physiological saline.

h. The glass beakers No. 1 and No. 2 were placed in a hot air dryer, and heat-treated at 140 ° C for 15 minutes to dry the contents of each beaker, and the total mass d _{1 of the} glass beaker No. _{1 was obtained} . The total mass d _{2 of} beaker No. ₂ .

i. The content (%) of the dissolved component of the superabsorbent polymer particles was determined by the following formula.

Dry solid mass of a mixture of superabsorbent polymer particles and 0.9% physiological saline: P(g)=(d ₁ )-(a ₁ )

Dry solids of 0.9% physiological saline: R(g)=(d ₂ )-(a ₂ )

Soluble component content: Q (%) = {(P / b) × 500 - (R / c) × 500} × 100 / 2.0

Method for measuring water absorption rate under pressure

A test tube having a bottom surface of an acrylic resin cylinder having an inner diameter of 30 mm and a height of 60 mm was prepared by using a nylon mesh of 250 mesh to obtain the quality. 0.1 g of superabsorbent polymer particles were placed in a test cylinder and weighed together with a test cylinder, after which the superabsorbent polymer particles were uniformly spread on the bottom surface of the test cylinder. The test cylinder was placed on a petri dish having a diameter of 200 mm, and a weight having an outer diameter of 29 to 29.5 mm and having a mass per unit area of 20 g/cm ² was placed on the superabsorbent polymer particles. 20 ml of 0.9% physiological saline solution was injected into the culture dish, and the test tube was kept for 60 minutes to allow 0.9% of physiological saline to be absorbed in the superabsorbent polymer particles. After 60 minutes, the scale was placed in a test cylinder having superabsorbent polymer particles to obtain an increase in mass. The amount of water absorption per 1 g of the superabsorbent polymer particles was determined by incrementing by 10 times, and the water absorption amount was taken as the water absorption ratio under pressure.

Table 1 shows the soluble component content ratio, the water retention ratio, and the like of the superabsorbent polymer particles SAP-A to SAP-E used in the article 1 for measurement according to Figs.

Table 2 shows the amount of use of the superabsorbent polymer particles SAP-A to SAP-E used for the article 1 for measurement; the water retention amount as the product of the amount of use and the water retention ratio in Table 1; soluble components The amount of exudation; and the result of the determination of the tactile sensation when the leather 82 (see FIG. 7) adhered to the soluble component was adhered to the fingertip. In Table 2, the amount of the superabsorbent polymer particles used was such that the water retention amount in the table was adjusted to a range of 4,000 to 4,200 g. The good or bad sense of touch is based on the judgment of a tester consisting of two males and three females between the ages of 40 and 60, and the judgment result in Table 2 is excellent: even after 1 to 6 hours. At any time, the amount of soluble components exuded was small, and the surface adhesion of the synthetic leather 82 was low, and the tester of five people was judged not to feel sticky and uncomfortable. A good judgment result means that even if the tester of five people feels sticky on the surface of the synthetic leather 82 at any time after 1 to 6 hours, the feeling is still tolerable. The result of the determination is that the tester of five people feels uncomfortable to the extent that the surface of the synthetic leather 82 is unacceptable at any time after 1 to 6 hours. In Table 2, the judgment result is excellent or good, which means that the amount of exudation does not exceed 80 mg. When the amount of exudation exceeded 80 mg and reached the period of 100 mg, the results of the tests by the five testers were inconsistent, and the results of good and bad judgments were mixed. Seepage The results of the determination of 5 people when the amount exceeded 100 mg were not good.

Fig. 8 shows the relationship between the content of the soluble component in Table 1 and the amount of bleeding in Table 2. The content of the soluble component and the amount of exudation are linearly changed. When the result of the determination of the tactile sensation in Table 2 is the same as that of FIG. 8, when the content of the soluble component of the superabsorbent polymer particles is not more than 15%, and more preferably, the content of the soluble component is not more than 13%, the determination of the tactile sense is obtained. The result is good.

The article 1 of the invention is not limited to use as a disposable diaper, but also as a diaper, a urine absorbing pad for use in combination with a diaper cover, and a urine absorbing pad for use in combination with an incontinent patient's shorts. Tablets, etc. are used. The article 1 can be used as a wipe for absorbing water and being treated, and other absorbent articles, and can be used as the article 1 when used as a wipe. The aqueous sheet is used as the lower sheet 3, or a sheet which is water-impermeable or water-impermeable is used.

1‧‧‧Water-absorbent articles

2‧‧‧Upper sheet

3‧‧‧Underlying sheet

4‧‧‧Superabsorbent polymer particles

6‧‧‧1st joint domain (existing domain of the desired mass per unit area of superabsorbent polymer particles)

7‧‧‧2nd joint domain (a non-existent domain of the desired mass per unit area of superabsorbent polymer particles)

11‧‧‧Hot melt adhesive for polymer particle fixation

12‧‧‧Sealing hot melt adhesive

[Fig. 1] A partially broken plan view of a water absorbent article.

Fig. 2 is a view showing a cut surface taken along line II-II of Fig. 1;

FIG. 3 is a view showing an example of a manufacturing process of the water absorbent article.

FIG. 4 is a partial enlarged view of FIG. 3.

FIG. 5 is a view similar to FIG. 1 showing an example of an embodiment.

Fig. 6 is a view similar to Fig. 5 showing an example of an embodiment.

Fig. 7 is a view showing a cut surface taken along line VII-VII of Fig. 6;

Fig. 8 is a graph showing the relationship between the content of the soluble component and the amount of bleeding.

7‧‧‧2nd joint domain

6‧‧‧1st joint domain

6a‧‧‧1st joint domain

7c‧‧‧Intermediate

7a‧‧‧lateral edge

6b‧‧‧1st joint domain

6c‧‧‧1st joint domain

6d‧‧‧1st joint domain

6e‧‧‧1st joint domain

6f‧‧‧1st joint domain

6g‧‧‧1st joint domain

6h‧‧‧1st joint domain

2‧‧‧Upper sheet

62‧‧‧ opposite side

Around 62a‧‧

61‧‧‧around

62b‧‧‧around

7b‧‧‧ Both ends

W‧‧‧ size

11‧‧‧Hot melt adhesive for polymer particle fixation

4‧‧‧Superabsorbent polymer particles

12‧‧‧Sealing hot melt adhesive

3‧‧‧Underlying sheet

1‧‧‧Water-absorbent articles

Claims (9)

An absorbent article in which superabsorbent polymer particles are interposed between opposing faces of upper and lower sheets, and at least the upper sheets of the superposed upper and lower sheets of the upper and lower sheets are water permeable. It is characterized in that the superabsorbent polymer particles are immersed in 0.9% physiological saline, and the measured soluble component content does not exceed 15% of the mass of the superabsorbent polymer particles, and the article is formed. a plurality of first regions interposed between the opposing surfaces of the superabsorbent polymer particles; and a second region in which the upper and lower sheets are joined to each other, the region surrounding each of the plurality of first regions The upper layer may include the first upper sheet and the second upper sheet which are overlapped with each other, and the first and second upper sheets are joined to each other in the first region and are located at the same time. The intermediate portions of the second regions between the adjacent first regions are not joined to each other. The water-absorbent article according to the first aspect of the invention, wherein the water-absorbing article further contains a second component having a soluble component content of not more than 15% and having a slower water absorption rate than the superabsorbent polymer particles. In the polymer particles, in the first region, the second superabsorbent polymer particles are on the side of the upper sheet, and the superabsorbent polymer particles are on the side of the lower sheet. The water-absorbent article according to the first or second aspect of the invention, wherein the superabsorbent polymer particles have an absorption equivalent to the aforementioned high When the water-absorbent polymer particles have a water retention ratio of 0.9%, the amount of the above-mentioned soluble components in the physiological saline solution does not exceed 80 mg. The water-absorbent article according to the first or second aspect of the invention, wherein the superabsorbent polymer particles are bonded to at least a part of the opposing faces of the two sheets via a hot-melt adhesive. The water-absorbent article according to the first or second aspect of the invention, wherein the water-absorbent ratio of the superabsorbent polymer particles in the absorption of 0.9% physiological saline is in the range of 10 to 50 g/g. The water-absorbent article according to the first or second aspect of the invention, wherein the superabsorbent polymer particles have a water absorption capacity under pressure of at least 15 g/g when absorbing 0.9% physiological saline. The water-absorbent article according to the first or second aspect of the invention, wherein the superabsorbent polymer particles have a water absorption rate in the range of 1 to 50 seconds when the 0.9% physiological saline solution is absorbed. The water-absorbent article according to the first or second aspect of the invention, wherein at least one of the upper and lower sheets is formed of any one of a nonwoven fabric of a thermoplastic synthetic fiber and an apertured film of a thermoplastic synthetic resin. The one of the sheets has a ventilation resistance value in the range of 0.40 to 0.04 KPa·s/m. The water absorbent article according to claim 4, wherein the superabsorbent polymer particles are bonded to one of the opposing faces at a ratio of 30 to 300 g/m ² .