JP5818483B2 - Water-absorbing articles - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a water-absorbing article including highly water-absorbing polymer particles, and more specifically, a water-absorbing article having a pad shape suitable for use as an absorbent body or disposable wipes in a body fluid-absorbing wearing article such as a disposable diaper. About.

  A water-absorbent article having a pad configuration in which highly water-absorbing polymer particles are interposed between sheet pieces in which at least one of the two sheet pieces is water-permeable is known.

  For example, an absorbent sheet which is an example of an absorbent article described in Japanese Patent Laid-Open No. 5-38350 (Patent Document 1) is obtained by applying a pressure-sensitive adhesive on a sheet-like absorbent material and then superabsorbing the superabsorbent polymer thereon. It is formed by dispersing particles, and further superposing another sheet-like absorbent material thereon and compressing and integrating them.

  Moreover, in the disposable wearing article described in Japanese Patent No. 3732320 (Patent Document 2), a plurality of water-permeable intermediate sheets and a liquid-impermeable back sheet that are positioned below the liquid-permeable surface sheet extend in parallel with each other. The tubular part is formed, and the tubular part contains a liquid-absorbing material containing 5 to 98% by weight of highly water-absorbing polymer particles.

  Furthermore, the absorbent sheet described in Japanese Patent Application Laid-Open No. 2009-131510 (Patent Document 3) is one in which highly water-absorbing polymer particles are contained between the upper sheet and the lower sheet, In the non-joined part surrounded by the joined part where the lower sheet is joined, a pocket is formed by the upper sheet and the lower sheet, and the superabsorbent polymer particles are accommodated in the pocket. The superabsorbent polymer particles are movable within the pockets.

JP-A-5-38350 Japanese Patent No. 3732320 JP 2009-131510 A

  The superabsorbent polymer particles of the kind used in the prior art may contain a soluble component in water such as urine. If the superabsorbent polymer particles are used in an absorbent body such as a disposable diaper, the surface of the absorbent body after urination becomes sticky due to leaching of soluble components dissolved in urine. May give a feeling of. Some wearers such as diapers may feel uncomfortable when the skin touches the surface.

  Accordingly, an object of the present invention is to provide a water-absorbing article that can alleviate such a problem caused by the soluble component of the highly water-absorbing polymer particles.

In order to solve the above-described problems, the present invention is directed to at least the upper layer sheet of the upper layer sheet and the lower layer sheet that overlap each other , and the super absorbent polymer between the opposing surfaces of the upper and lower layer sheets. It is a water-absorbent article with particles interposed.

The present invention is characterized in that the superabsorbent polymer particles have a soluble component content of more than 15% of the mass of the superabsorbent polymer particles measured by immersing in 0.9% physiological saline. And the article includes a plurality of first regions in which the required amount of the superabsorbent polymer particles are interposed between the opposing surfaces, and each of the plurality of the first regions surrounds each of the required amounts. A second region in which the upper and lower layer sheets are joined to each other so as to allow interposition,
The upper layer sheet includes a first upper layer sheet and a second upper layer sheet that overlap each other, and the first and second upper layer sheets are joined to each other in the first region, and are positioned between the adjacent first regions. The intermediate portion of the second region is not joined to each other .

  In one embodiment of the present invention, the superabsorbent polymer particles have an amount of the soluble component exuded when 0.9% physiological saline corresponding to the water retention ratio of the superabsorbent polymer particles is absorbed. Does not exceed 80 mg.

In one embodiment of the invention, the superabsorbent polymer particles, at least a portion is bonded with a hot melt adhesive to one of the opposing surfaces of the upper and lower layer sheets.

In one embodiment of the present invention, the composition further comprises second superabsorbent polymer particles having a soluble component content of not exceeding 15% and a slow water absorption rate compared to the superabsorbent polymer particles, In the first joining region, the second superabsorbent polymer particles are located on the upper sheet side, and the superabsorbent polymer particles are located on the lower sheet side.

  In one embodiment of the present invention, the superabsorbent polymer particles have a water retention ratio in the range of 10 to 50 g / g when 0.9% physiological saline is absorbed.

  In one embodiment of the present invention, the superabsorbent polymer particles have a water absorption capacity under pressure of at least 15 g / g when 0.9 physiological saline is absorbed.

  In one embodiment of the present invention, the superabsorbent polymer particles have a water absorption rate in the range of 1 to 50 seconds when 0.9% physiological saline is absorbed.

In one embodiment of the present invention, at least one of the upper and lower layer sheets is formed of either a nonwoven fabric of thermoplastic synthetic fibers or an apertured film of thermoplastic synthetic resin, and the one sheet is The ventilation resistance value is in the range of 0.40 to 0.04 KPa * s / m. However, s means second and m means meter.

In one embodiment of the present invention, the superabsorbent polymer particles are bonded to one of the opposing surfaces at a rate of 30 to 300 g / m ² .

  In the water-absorbent article according to the present invention, the content of the soluble component measured by immersing in a 0.9% physiological saline solution with respect to the highly water-absorbent polymer particles interposed between the opposing surfaces of the two overlapping sheet pieces. Is used so that it does not exceed 15% of the mass of the superabsorbent polymer particles, so that the amount of the soluble component leached on the surface of the superabsorbent article when the absorbent article absorbs water is kept low. be able to. Thereby, the problem that the surface of the water-absorbent article is sticky and gives unpleasant feeling to the skin touching the surface can be solved.

The partially broken top view of a water absorbing article. The figure which shows the II-II line | wire cut surface of FIG. The figure which shows an example of the manufacturing process of a water absorptive article. The elements on larger scale of FIG. The figure similar to FIG. 1 which shows an example of an embodiment. The figure similar to FIG. 5 which shows an example of an embodiment. The figure which shows the VII-VII line cut surface of FIG. The figure which shows the relationship between a soluble component content rate and the amount of exudation.

  The details of the water-absorbent article having the pad configuration according to the present invention will be described with reference to the accompanying drawings.

  1 and 2, FIG. 1 is a partially broken plan view of a water absorbent article 1 having a pad shape, and FIG. 2 is a diagram showing a cross-sectional view taken along the line II-II of FIG. Each of C shows the vertical direction, the horizontal direction, and the thickness direction which are orthogonal to each other. In these drawings, the article 1 includes an upper layer sheet 2 that is water permeable, a lower layer sheet 3 that is either water permeable, poorly water permeable, or water impermeable, and superabsorbent polymer particles 4. As the highly water-absorbing polymer 4, for example, among the various polymers well-known to those skilled in the art, such as sodium polyacrylate-based water-insoluble and having a water absorption of 10 times or more of its own weight, Can be used that does not exceed 15% of its own weight, more preferably 13% of its own weight. The article 1 also includes a plurality of first joining regions 6 in which the upper layer sheet 2 and the lower layer sheet 3 are spaced apart and the superabsorbent polymer particles 4 are joined to the inner surface 3a of the lower layer sheet 3, and the upper layer sheet 2 and the lower layer sheet A second joining area 7 where the sheet 3 is joined is included. That the lower layer sheet 3 is water permeable means that the lower layer sheet 3 can easily pass water in the same manner as the upper layer sheet 2, and that the lower layer sheet 3 is hardly water permeable means that the upper layer sheet 2 and Means that the lower layer sheet 3 is in a state of not allowing water to permeate as much as the upper layer sheet 2. The lower layer sheet layer 3 is impermeable to water in comparison with the upper layer sheet 2. Is in a state of substantially not transmitting. Depending on the application, use state, manufacturing method, and the like of the article 1, any one of a water-permeable material, a hardly water-permeable material, and a water-impermeable material is adopted for the lower layer sheet 3. In FIG. 2, the diameter of the superabsorbent polymer particle 4 is exaggerated in order to clearly show the presence of the superabsorbent polymer particle 4 described later.

In FIG. 1, the 1st junction area 6 is surrounded by the 2nd junction area 7, and forms the water absorption area by including the highly water-absorbing polymer particle 4 as a water absorbing material. In other words, the first bonding region 6 is a region where the superabsorbent polymer particles 4 are contained in the required mass per unit area of the inner surface 3 a of the lower layer sheet 3. In the first joining region 6, the superabsorbent polymer particles 4 are 30 to 300 g / m ² , more preferably via the polymer particle fixing hot melt adhesive 11 that is uniformly applied to the entire lower layer sheet 3. The lower layer sheet 3 is bonded at a rate of 40 to 280 g / m ² . However, the first joining region 6 is a region that can contain superabsorbent polymer particles that are not joined to the lower layer sheet 3, and the first joining region 6 is included between the lower layer sheet 3 and the upper layer sheet 2. The upper limit of the total amount of superabsorbent polymer particles 4 that can be is 400 g / m ² . In the first joining region 6, it is preferable that the inner surface 3 a of the lower layer sheet 3 and the inner surface 2 a of the upper layer sheet 2, which is a surface opposed to the inner surface 3 a, are not joined. 4), the upper layer sheet 2 may be bonded to the lower layer sheet 3 in a very small area although not intended.

The second bonding region 7 has a high water absorption property when the highly water-absorbing polymer particles 4 contained in the first bonding region 6 are not bonded to the polymer particle fixing hot melt adhesive 11 and are free to move. A region for preventing the conductive polymer particles 4 from coming out of the first joining region 6, that is, a region for sealing the periphery of the first joining region 6, which does not contain a water-absorbing material or absorbs water. Water absorption except for the upper layer sheet 2 and the lower layer sheet 3 and the superabsorbent polymer particles 4 of up to 20 g / m ² , which are not intended in the manufacturing process of the article 1. In the present invention, the superabsorbent polymer particles 4 are included in a required mass per unit area of the lower layer sheet 3. No This is referred to as a non-existent region of the superabsorbent polymer particles 4. That is, even if the second bonding area 7 may contain the superabsorbent polymer particles 4, the mass per unit area of the superabsorbent polymer particles 4 (g / g) m ² ) is a region less than the mass (g / m ² ) per unit area of the superabsorbent polymer particles 4 included in the first bonding region 6. In the second joining region 7, the upper layer sheet 2 and the lower layer sheet 3 are joined via the hot melt adhesive 12 for sealing. However, the article 1 can also improve the peel strength of the sheets 2 and 3 by further welding the upper layer sheet 2 and the lower layer sheet 3 that are joined in this manner. In any case, the upper layer sheet 2 and the lower layer sheet 3 are not peeled even during use of the article 1 in the second bonding region 7. In the article 1 illustrated in FIG. 2, the polymer particle fixing hot melt adhesive 11 and the second hot melt adhesive 102 described later (see FIGS. 3 and 4) are applied so as to overlap in the second joining region 7. Form a hot melt adhesive 12 for sealing, and the upper layer sheet 2 and the lower layer sheet 3 are joined via the hot melt adhesive 12 for sealing. As these hot melt adhesives in the article 1, those conventionally used in this kind of article can be used.

  The article 1 in the illustrated example is made to be long in the longitudinal direction A. In the longitudinal direction A, eight sections of the first joining area 6 indicated by reference numerals 6a to 6h, that is, a water absorption area are arranged. Each of the first joining regions 6a to 6h has a periphery 61 that defines its planar shape. Peripheral portions 62 that face each other in the vertical direction A and extend in the horizontal direction B are included in the periphery 61 of the first joining regions 6 that are adjacent in the vertical direction A. For example, in the periphery 61 of the adjacent first joining regions 6a and 6b in FIG. 1, opposite side portions 62 facing each other in the vertical direction A and extending in the horizontal direction B are indicated by reference numerals 62a and 62b.

  In the article 1, the second joining regions 7 are on both sides of the article 1 and extend in the longitudinal direction A. The side edges 7 a extend in the longitudinal direction A. , And an intermediate portion 7c extending in the lateral direction B between the adjacent first joining regions 6. As is apparent from FIG. 2, the intermediate portion 7c is a portion that can be called a groove formed between the adjacent first joining regions 6, and the dimension W in the longitudinal direction A is the width of the groove. It is.

  When such an article 1 is used as, for example, an absorbent body of a disposable diaper or a urine absorbing pad of an incontinence patient's pants, the longitudinal direction A of the article 1 is made to coincide with the front-rear direction of the diaper, and the central portion of the longitudinal direction A is a diaper. Arrange to come to the inseam area. The upper layer sheet 2 is formed of a water-permeable sheet piece and is directed to the skin of the diaper wearer.

  In the diaper, the possibility of obtaining various functions and effects is improved by using the article 1. For example, urine excreted by the wearer permeates through the upper layer sheet 2 in the first joint region 6 and is absorbed by the superabsorbent polymer particles 4 so that it does not flow. In the diaper, by fixing the superabsorbent polymer particles 4 to the lower layer sheet 3 formed of the hardly water-permeable or water-impermeable sheet piece, the wearer's crotch can be changed even if the posture of the wearer changes variously. The distribution state of the highly water-absorbing polymer particles 4 in the part is always constant, and there is no bias in the first joining region 6. Therefore, in the article 1, urine can permeate in a wide range of the upper layer sheet 2 and can be absorbed in a wide range of the first joint region 6. Further, since the distribution of the superabsorbent polymer particles 4 is biased inside the first joining region 6 and the article 1 is not uniform in thickness, the article 1 locally compresses the wearer's skin. There is no such thing as to do. In the first bonding area 6, the polymer particle fixing hot melt adhesive 11 is applied to the lower layer sheet 3 and not applied to the upper layer sheet 2, so that the polymer particle fixing hot melt adhesive 11 is applied to the upper layer sheet 2. There is no hindrance to water permeability. The superabsorbent polymer particles 4 fixed to the lower layer sheet 3 prevent the upper layer sheet 2 from approaching and joining to the lower layer sheet 3 to which the hot melt adhesive 11 for fixing polymer particles is applied, This prevents the article 1 from being poorly flexible by bonding the upper sheet 2 to the lower sheet 3. In the article 1 when placed in the crotch region of the diaper, a plurality of intermediate portions 7c that are parallel to each other as shown in the drawing act so that the article 1 can be easily bent in the longitudinal direction A. The width W of the intermediate part 7c acting in this way is preferably 2 to 15 mm.

In an example of the article 1 when used for a diaper, the upper layer sheet 2 includes a sheet piece of a water-permeable nonwoven fabric formed of thermoplastic synthetic fibers and subjected to a hydrophilic treatment, for example, an SMS nonwoven fabric formed of polypropylene fibers ( The sheet piece of spunbond-meltblown-spunbond non-woven fabric can be used in a state of being subjected to a hydrophilic treatment. An example of the SMS nonwoven, 4-5 g / m per unit area is interposed meltblown nonwoven having a mass proportion of 0.5 to 2 g / m ² between the spunbonded nonwoven fabric to each other having a ratio of the mass of ² There is a nonwoven fabric whose mass is 10-12 g / m ² . The upper layer sheet 2 may also be a laminate having a two-layer structure such as a laminate of a hydrophilically treated spunbond nonwoven fabric and a hydrophilicized SMS nonwoven fabric (see FIG. 5). The upper sheet 2 may also be made of a water-permeable, apertured plastic film instead of the water-permeable nonwoven fabric.

The lower layer sheet 3 may be a non-woven sheet piece made of hydrophobic thermoplastic synthetic fiber and hardly or water-impermeable. For example, per unit area is interposed meltblown nonwoven having a mass proportion of 0.5 to 2 g / m ² between the spunbonded nonwoven fabric to each other with a mass ratio of 4-6 g / m ² formed of polypropylene fibers The sheet piece of the non-permeable SMS nonwoven fabric whose mass is 10-13 g / m < ² > can be used. The lower layer sheet 3 was also formed of a water-impermeable sheet piece formed of a plastic film such as a polyethylene film having a thickness of 0.01 to 0.03 mm, or a water-impermeable plastic film and a thermoplastic synthetic fiber. It is possible to use a water-impermeable sheet piece that is a laminate with a water-permeable or hardly water-permeable nonwoven fabric. In the laminated body, the superabsorbent polymer particles 4 are bonded to the nonwoven fabric so that the nonwoven fabric is inside the article 1 and the water-impermeable plastic film is outside the article 1, and from the fiber gap in the nonwoven fabric. It is preferable to stop leakage of body fluid with a plastic film (see FIG. 5).

  In the superabsorbent polymer particles 4, the soluble component content measured based on the measurement method of soluble component content described later does not exceed 15%, and more preferably does not exceed 13%. Is used. When the superabsorbent polymer particles 4 are in contact with moisture such as urine, soluble components with respect to the moisture exude to the surface of the upper layer sheet 2 of the article 1 together with moisture, and the surface is sticky. It may change to a slimy surface. The wearer of the diaper in which the article 1 is used may feel strong discomfort when the skin touches such a surface. Therefore, in the article 1, by controlling the content of soluble components in the superabsorbent polymer particles 4, the amount of the component eluted with respect to the urine excreted in the article 1 can be kept low, and the surface of the upper layer sheet 2 can be reduced. Prevents stickiness.

  The superabsorbent polymer particles 4 also preferably have a water retention ratio measured by a method described later in the range of 10 to 50 g / g. If the water-absorbing polymer particles having a water retention ratio of less than 10 g / g are used for the article 1 to ensure the water absorption necessary for the article 1, the amount of the super-absorbent polymer particles used per unit area is As the number of particles increases, the number of particles that cannot be bonded in the first bonding region 6 increases. In such an article 1, it may be difficult to exhibit its specific actions and effects, or it may be unpleasant to wear. In addition, when the water retention ratio exceeds 50 g / g, the gel strength is reduced by a large amount of absorbed water, and when the external pressure is applied, the water that the particles should have absorbed can be easily released. .

  However, when the superabsorbent polymer particle 4 is used in the article 1, it is preferable that it can absorb a large amount of moisture such as urine even under an external pressure acting on the article 1. Therefore, the superabsorbent polymer particles 4 are those having a water absorption capacity under pressure of at least 15 g / g based on the measurement method described later.

  Further, it is preferable to use the superabsorbent polymer particles 4 having a water absorption rate in the range of 1 to 50 seconds according to the VORTEX method defined in JIS K 7224. In the article 1 using the highly water-absorbing polymer particles 4 having a water absorption speed exceeding 50 seconds, the reverse flow phenomenon of moisture that has permeated through the upper sheet 2 but has not been absorbed by the highly water-absorbing polymer particles 4 yet. It is likely to occur.

In the specific example of the article 1, the superabsorbent polymer particles 4 having a water absorption rate of about 30 seconds by the VORTEX method can be used with an upper limit of 400 g / m ² . However, the amount of the superabsorbent polymer particles 4 used is preferably adjusted in consideration of the size of the section of the first joint region 6 and the usage form of the article 1.

The hot melt adhesive 11 for fixing polymer particles is applied to the lower layer sheet 3 in the first bonding region 6 in order to fix the superabsorbent polymer particles 4 to the lower layer sheet 3. 7 may be applied to the lower layer sheet 3 in FIG. For example, in FIG. 2, the polymer particle fixing hot melt adhesive 11 is applied at a rate of 1 to 12 g / m ² so as to be uniformly distributed over the entire inner surface 3 a of the lower layer sheet 3. The superabsorbent polymer particles 4 to be fixed to the lower layer sheet 3 in the first joining region 6 have a polymer particle fixing hot melt so that the entire surface is not covered with the polymer particle fixing hot melt adhesive 11. It is preferable to reduce the coating amount of the adhesive 11 per unit area as much as possible. The polymer particle fixing hot melt adhesive 11 can also be applied to the lower layer sheet 3 so as to be intermittently distributed in the form of dots or beads. It can also be applied. However, in any case, the surface of the superabsorbent polymer particle 4 is bonded to the inner surface 3a while the portion facing the inner surface 3a of the lower layer sheet 3 is covered with the hot melt adhesive 11 for fixing the polymer particles. It is preferable that the portion facing the inner surface 2a (see FIG. 2) is in a state in which urine can be absorbed quickly without being covered with the polymer particle fixing hot melt adhesive 11.

The hot-melt adhesive 12 for sealing is additionally provided with the second hot-melt adhesive 102 in FIG. 4 to be described later with respect to the hot-melt adhesive 11 for fixing polymer particles applied to the lower layer sheet 3 located in the second bonding area 7. Is applied at a rate of 5 to 30 g / m ² . Thus, by adjusting the application amount of the hot melt adhesive in the first joining area 6 and the second joining area 7, the polymer particle fixing hot melt adhesive 11 is highly water-absorbing in the first joining area 6. While the surface of each of the polymer particles 4 is widely covered to avoid affecting the water absorption amount and the water absorption speed of the superabsorbent polymer particles 4, only the hot melt adhesive 11 for fixing the polymer particles is used in the second bonding area 7. Then, when the amount of adhesive applied is small and peeling between the upper layer sheet 2 and the lower layer sheet 3 cannot be reliably prevented, the sealing hot melt adhesive 12 can prevent peeling. In the second bonding region 7, when the superabsorbent polymer particles 4 that are not fixed to the lower sheet 3 are present in the first joint region 6, the superabsorbent polymer particles 4 are separated from the first joint region 6. Hot melt adhesive for sealing, preferably applied in a continuous or substantially continuous manner along the periphery of the first bonding area 6 so as to prevent movement to the second bonding area 7 It is preferable to join the upper layer sheet 2 and the lower layer sheet 3 through the agent 12. The polymer particle fixing hot-melt adhesive 11 and the sealing hot-melt adhesive 12 used in this way can be the same or those that adhere well to each other. In addition, when the function as the sealing hot melt adhesive 12 can be achieved only by the polymer particle fixing adhesive 11 applied to the second bonding region 7, the second hot melt adhesive 102 in FIG. 4 is not required. become. In this case, the application amount per unit area of the polymer particle fixing hot melt adhesive 11 may be the same in the first bonding area 6 and the second bonding area 7.

  Although it is possible to use a plastic film instead of a non-woven fabric as the lower layer sheet 3, when a plastic film is used, a hot melt adhesive for fixing polymer particles is used to bond the superabsorbent polymer particles 4 to the plastic film. In some cases, the application amount of 11 must be increased. In such a case, the surface of the superabsorbent polymer particles 4 is likely to be widely covered with the polymer particle fixing hot melt adhesive 11.

  Each of the dimensions of the first joining region 6 in the longitudinal direction A and the lateral direction B of the article 1 when used for a diaper, i.e., each dimension of the longitudinal direction A and the lateral direction B of one section in FIG. It can be set to an appropriate value according to the size of the first, but as an example, it can be set in the range of 25 to 100 mm and 150 to 250 mm, and the first joining area in such a dimension The number of 6 sections is preferably 5-15. The width of the side edge portion 7a and the end edge portion 7b of the second bonding area 7 is preferably 5 to 30 mm.

  3 and 4 are an example of a process diagram when the article 1 is continuously manufactured, and a partial enlarged view of the suction drum 130 in the process diagram. In FIG. 3, the first web 131 which is a continuous body of the upper layer sheet 2 is supplied toward the peripheral surface 135 of the suction drum 130 from the right side of the drawing. The first web 131 that is in close contact with the peripheral surface 135 by the pressing action by the guide roll 141 and the suction action that works from the peripheral surface 135 toward the inside of the suction drum 130 is a polymer set above the suction drum 130. Superabsorbent polymer particles 4 are supplied from the particle supply device 136.

  From the left side of the figure, the second web 132 which is a continuous body of the lower layer sheet 3 is continuously supplied to the peripheral surface 135 of the suction drum 130 via the guide roll 142. The first hot melt adhesive 101 is applied to one surface of the second web 132 by a first coater 121 provided on the upstream side of the suction drum 130. Subsequently, the second hot melt adhesive 102 is applied onto a part of the first hot melt adhesive 101 already applied by the second coater 122 provided on the downstream side of the first coater 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 on the peripheral surface 135 of the suction drum 130. The composites 137 are formed by joining and joining via the first hot melt adhesive 101 and the second hot melt adhesive 102. The composite 137 is intermittently cut by the cutter 138 and becomes an individual article 1. The first hot melt adhesive 101 is the polymer particle fixing hot melt adhesive 11 in the article 1, but the one that overlaps the second hot melt adhesive 102 is integrated with the second hot melt adhesive 102. Thus, the sealing hot melt adhesive 12 in the article 1 is formed. Details of the step of forming the composite 137 are as described in FIG.

  FIG. 4 shows a state in which the first web 131 and the second web 132 merge to form a composite 137, and the suction drum 130 is shown in a sectional view. A plurality of recesses 141 are formed on the circumferential surface 135 of the suction drum 130 so as to be arranged in the circumferential direction. The planar shape of each of the concave portions 141 corresponds to the planar shape of each section of the first joining region 6 arranged in the longitudinal direction A in FIG. The depth of the concave portion 141 is set to such an extent that a single supply amount of the superabsorbent polymer particles 4 supplied intermittently from the polymer supply device 136 can be accommodated. In the concave portion 141, suction toward the inside of the suction drum 130 acts, and the first web 131 placed on the peripheral surface 135 is deformed so as to follow the concave portion 141. In the deformed portion of the first web 131, the superabsorbent polymer particles 4 supplied from the polymer particle supply device 136 toward the concave portion 141 are accommodated. In the circumferential surface portion 135a located as a raised portion between the adjacent concave portions 141 and 141 in the circumferential surface 135, the first web 131 and the second web 132 merge, and the two webs 131 and 132 are joined together. When passing through the first press roll 143, it is pressed and joined by the peripheral surface portion 135 a and the first press roll 143 to form a composite 137. The composite 137 advances in the machine direction MD and leaves the suction drum 130, and is then pressed by the pair of second press rolls 144 so that the superabsorbent polymer particles 4 and the first hot melt adhesive 101 are in contact with each other. Then, the superabsorbent polymer particles 4 are fixed to the second web 132 via the first hot melt adhesive 101. In FIG. 3, the composite 137 enters between the pair of second press rolls 144 while being inclined with respect to the machine direction MD indicated by the horizontal arrow, but is separated from the suction drum 130. The composite 137 enters between the second press rolls 144 in a substantially horizontal state, and the superabsorbent polymer particles 4 can be dispersed between the first web 131 and the second web 132 in a nearly horizontal state. More preferred.

  In the article 1 thus formed, the first hot melt adhesive 101 is uniformly applied in both the longitudinal direction A and the lateral direction B with respect to each of the first joining region 6 and the second joining region 7. Although it can be applied intermittently so as to be distributed, it can also be applied continuously in at least one of the vertical direction A and the horizontal direction B. Therefore, there is no special rule in selecting the model of the first coater 121 for applying the first hot melt adhesive 101, and the same applies to the second hot melt adhesive 102. However, in the article 1, between the hot melt adhesive 11 for fixing polymer particles in the first joining region 6 and the hot melt adhesive 12 for sealing in the second joining region 7, both hot melt adhesives 11 and 12 are present. It is preferable that they are in a continuous mode or in a mode where they are close to each other so that the distance between them does not exceed 5 mm even if it is not a continuous mode. When the polymer particle fixing hot melt adhesive 11 is applied in such a manner and reaches all corners of the first joining region 6, the superabsorbent polymer particles 4 also reach every corner of the first joining region 6. It becomes like this. For example, the superabsorbent polymer particles 4 can be distributed along the opposite side portion 62 immediately inside the opposite side portion 62 of the first joining region 6. The superabsorbent polymer particles 4 are preferably distributed so as to cover substantially the entire inner surface 3a (see FIG. 2) of the lower layer sheet 3 in the first joining region 6, and the superabsorbent polymer particles 4 thus distributed are In the first joining region 6, it is possible to prevent the upper layer sheet 2 and the lower layer sheet 3 from being joined via the polymer particle fixing hot melt adhesive 11.

In the article 1, it is also preferable that the total amount of the superabsorbent polymer particles 4 in the first joining region 6 is joined and fixed to the inner surface 3 a of the lower sheet 3, but the superabsorbent that is not joined to the lower sheet 3. The present invention can be implemented even if the polymer particles 4 are mixed in the first joining region 6 in a state where the polymer particles 4 can move between the lower layer sheet 3 and the upper layer sheet 2. In order to store the highly water-absorbing polymer particles 4 in the first joining region 6 in such a state, the upper-layer sheet 2 and the lower-layer sheet 3 in the case where they are formed of a nonwoven fabric, It is preferable that the nonwoven fabric cannot easily enter the fiber gap or pass through the fiber gap easily. In order to select such a non-woven fabric, it is only necessary to visually confirm that the particles 4 do not enter the fiber gaps in the non-woven fabric by applying vibration while the superabsorbent polymer particles 4 are dispersed on the non-woven fabric. . However, instead of selecting the nonwoven fabric in this way, the airflow resistance value is in the range of 0.40 to 0.04 KPa * s / m , more preferably 0.30 to 0.05 KPa * s / m. A nonwoven fabric may be selected and used. Here, s means second and m means meter. In the nonwoven fabric, the gap between the fibers forming the nonwoven fabric tends to decrease as the ventilation resistance value increases. The airflow resistance value, which is an index when selecting a nonwoven fabric, is a value measured using a KES-FB air permeability tester manufactured by Kato Tech Co., Ltd.

  Further, in the article 1, the shape of the article 1, the shape of the first bonding area 6, and the number of sections formed by the first bonding area 6 are not particularly limited, and these shapes and numbers in the illustrated example are appropriately changed. Can be added. For example, in the article 1 of FIG. 1, the shape of the second bonding area 7 can be changed so that the first bonding area 6 can be divided into two or three in the lateral direction B.

Furthermore, in the article 1, in the first joining region 6, second superabsorbent polymer particles (not shown) having a water absorption rate different from that of the superabsorbent polymer particles 4 can be mixed. For example, the superabsorbent polymer particles 4 bonded to the lower layer sheet 3 have a water absorption rate AS ₁ of 3 seconds by the VORTEX method, and the second superabsorbent polymer particles have a water absorption rate AS of the VORTEX method. ₂ is 30 seconds, and the second superabsorbent polymer particles are passed through the second polymer particle fixing hot melt adhesive (not shown) to the upper layer sheet 2 in the first joining region 6. Or can be mixed in the first joining region 6 in a state where it can move freely without being joined to the upper layer sheet 2 or the lower layer sheet 3. In this way, the superabsorbent polymer particles 4 having a fast water absorption rate AS ₁ are close to the lower layer sheet 3, and the second superabsorbent polymer particles having a slow water absorption rate AS ₂ are close to the upper layer sheet 2. When the article 1 is used so that the upper layer sheet 2 comes into contact with the skin, the urine excreted in the initial stage of wearing the diaper forms a gel block by the second superabsorbent polymer particles absorbing the urine. Before it happens, most of the urine is absorbed by the superabsorbent polymer particles 4 far from the skin of the diaper wearer to keep the urine away from the skin, and then the excreted urine is removed from the skin. It can be absorbed by the second superabsorbent polymer particles in the vicinity, and it can be prevented that the diaper wearer is strongly moistened by the initial urine. However, the mass of the superabsorbent polymer particles included in the first joining region 6 is a mass that does not exceed 400 g / m ^{2 in} total of the superabsorbent polymer particles 4 and the second superabsorbent polymer particles. Is preferred. As the second superabsorbent polymer particles, those having a soluble component content of not more than 15% are also used. The second superabsorbent polymer particles further have a water retention ratio in the range of 10 to 50 g / g, a water absorption ratio under pressure of at least 15 g / g, and a water absorption speed in the range of 1 to 50 seconds. used.

FIG. 5 is a view similar to FIG. 1 showing an example of the embodiment. 5, the upper layer sheet 2 is formed by the first upper layer sheet 21 and the second upper layer sheet 22 that overlap each other, and the lower layer sheet 3 is formed by the first lower layer sheet 31 and the second lower layer sheet 32 that overlap each other. ing. The first upper layer sheet 21 is used to cover and hold the superabsorbent polymer particles 4 in cooperation with the first lower layer sheet 31 in the article 1, and an example thereof is the upper layer sheet in FIG. There is a water-permeable nonwoven fabric which is the same as ² and is formed of a thermoplastic synthetic fiber which has been subjected to a hydrophilic treatment and has a mass per unit area of 10 to 12 g / m ² . Similar to the upper layer sheet 2 of FIG. 1, the first upper layer sheet 21 is formed with a first bonding area 6 and a second bonding area 7. The second upper layer sheet 22 is for covering and protecting the first upper layer sheet 21 when the article 1 is used in a disposable diaper or the like. An example of such a second upper layer sheet 22 includes a unit area. There is a water-permeable, water-permeable, spunbonded nonwoven fabric having a per weight of 10 to 25 g / m ² . The first upper layer sheet 21 and the second upper layer sheet 22 are joined together via a hot melt adhesive 36 that is intermittently applied to the first upper layer sheet 21 or the second upper layer sheet 22. However, the first upper layer sheet 21 and the second upper layer sheet 22 may be separated from each other in the peripheral region 38 of the first bonding region 6. In FIG. 2, the intermediate portion 7 c having a groove shape is a portion included in the peripheral region 38.

The superabsorbent polymer particles 4 are joined to the first lower layer sheet 31 of the lower layer sheet 3 via the polymer particle fixing hot melt adhesive 11 (see FIGS. 1 and 2) applied thereto. The first lower layer sheet 31 is also bonded to the first upper layer sheet 21 via the hot melt adhesive 12 for sealing. A nonwoven fabric or a plastic film can be used for the first lower layer sheet 31. In the illustrated example, the first lower layer sheet 31 is formed of a polypropylene fiber that has been subjected to hydrophilic treatment, and has a mass per unit area of 10 g / m ^2. Liquid SMS nonwoven fabric is used. The second lower layer sheet 32 of the lower layer sheet 3 is used to make the outer surface side of the article 1 leakproof. In the illustrated example, a polyethylene film having a thickness of 15 μm is used. The first lower layer sheet 31 and the second lower layer sheet 32 are joined via a hot melt adhesive 37 applied to the second lower layer sheet 32.

  The second upper layer sheet 22 and the second lower layer sheet 32 are formed in the same shape and the same size, and in portions extending from the peripheral edges of the first upper layer sheet 21 and the first lower layer sheet 31 that are joined to each other. Overlap and bond together via hot melt adhesive 36 and / or 37.

  In the diaper in which the article 1 having a laminated structure formed as described above is used, for example, when urine is absorbed, the elution component contained in the superabsorbent polymer particles 4 oozes out on the surface of the first upper sheet 21 together with urine. Even so, the elution component does not immediately contact the skin of the diaper wearer due to the presence of the second upper layer sheet 22, but the elution component flows toward the peripheral region 38 of the first joining region 6. If it happens, it will be far away from the skin, and the chance of contact between the skin and the eluted components will be reduced. Therefore, in this article 1, the problem that the surface of the second upper layer sheet 22 is slim and gives an unpleasant feel can be reduced or eliminated.

  6 and 7, FIG. 6 is a view similar to FIG. 5 for the article 1 showing an example of the embodiment, and FIG. 7 is a view showing a section taken along line VII-VII in FIG. 6.

  The article 1 in FIG. 6 has substantially the same laminated structure as the article 1 in FIG. 5, the upper layer sheet 2 is formed by the first upper layer sheet 21 and the second upper layer sheet 22, and the lower layer sheet 3 is the first. The lower layer sheet 31 and the second lower layer sheet 32 are formed. Between the 1st upper layer sheet | seat 21 and the 1st lower layer sheet | seat 31, the 1st joining area | region where the highly water-absorbing polymer particle 4 is joined to the 1st lower layer sheet 31 via the hot melt adhesive 11 for polymer particle fixation. 6 and a second joining region 7 in which the first upper layer sheet 21 and the first lower layer sheet 31 are joined via the hot melt adhesive 12 for sealing. However, the article 1 in FIG. 6 has a rectangular first joining area 6 formed in only one section, and the first joining area 6 has a longitudinal dimension M and a lateral dimension N. Yes.

In this invention, in an example when measuring the amount of soluble components contained in the superabsorbent polymer particles 4 leaching to the surface of the upper layer sheet 2, an article 1 having dimensions M and N of 10 cm in FIGS. Used as an article 1 for measurement. Moreover, in the article 1 for measurement, the first upper layer sheet 21 and the first lower layer sheet 31 are spunbond-meltblown-spunbond non-woven fabric (SMS non-woven fabric) formed by hydrophilized polypropylene fibers. The one having a mass per unit area of 10 g / m ² was used. The spunbonded nonwoven fabric in the SMS nonwoven fabric was used which has a mass of 4~4.5g / ^{m 2,} the melt blown nonwoven fabric was used having a weight of 1 to 2 g / ^{m 2.} In addition, a polypropylene fiber having a fineness of 1.4 dtex was used as the polypropylene fiber in the spunbonded nonwoven fabric, and a polypropylene fiber having a fineness of 0.03 to 0.09 dtex was used as the polypropylene fiber in the melt blown nonwoven fabric. For the second upper layer sheet 22 in the article 1, a spunbonded nonwoven fabric formed of polypropylene fibers having a fineness of 2.8 dtex and having a mass per unit area of 18 g / m ² was used after being subjected to a hydrophilic treatment.

Each of the first upper layer sheet 21 and the first lower layer sheet 31 formed in this manner has an airflow resistance value of 0.0595 KPa * s / m for the five sheets, and the second upper layer sheet 22. The average value of the airflow resistance value was 0.0176 KPA * s / m .

The hot melt adhesives 11, 36, and 37 used in the measurement article 1 were applied using a spiral spray machine. The coating amount, the first hot-melt adhesive 11 is 10 g / ^{m 2,} a hot melt adhesive 36 is 5 g / ^{m 2,} a hot melt adhesive 37 was 10 g / ^{m 2.} About hot-melt adhesive agent 36, specifically, the application area rate with respect to the 2nd upper layer sheet | seat 22 may be 15-25% so that the application area rate with respect to the 1st joining area | region 6 may be 15-25%. The operating conditions of the spiral spray machine were adjusted so that the hot melt adhesive 36 did not hinder urine permeation to the upper layer sheet 2.

In addition, in order to measure the application area ratio of the hot melt adhesive 36 in the second upper layer sheet 22, a formation tester FMT-MIII manufactured by Nomura Corporation was used. When measuring the coating area ratio, black powder toner was sprayed on the hot melt adhesive 36 applied to the second upper layer sheet 22 for measurement, and the hot melt adhesive 36 was colored. When the toner was sprayed, the toner adhering to the nonwoven fabric forming the second upper layer sheet 22 was removed by blowing off using pressurized air. The tester was used under the conditions that the camera correction sensitivity was 100%, the moving element was 1, and the effective size was 10 × 10 cm. The first joining region 6 of the second upper layer sheet 22 for measurement is irradiated with light from the side of the skin contact surface of the sheet 22, while the hot melt adhesive 36, which is the opposite surface, is applied. From the side, the transmitted light amount of the entire first bonding area 6 was measured by a tester, and the ratio of the transmitted light amount to the irradiated light amount was calculated to obtain the average light transmittance (%). The tester also analyzes the image of the opposite surface, finds the total area of the portion that is colored black with toner and has a light transmittance that is 10% or more lower than the average light transmittance, and the area of the first bonding area 6 is 100 cm ^2. The ratio of the total area to the coating area ratio of the hot-melt adhesive 36 was taken as the ratio.

FIG. 7 also shows a 10 × 10 cm synthetic leather (manufactured by Idemitsu Technofine, product number PBZ13001) 81 placed on the second upper layer sheet 22, and a 10 × 10 cm acrylic resin plate 82 to which the synthetic leather 81 is bonded. The pressure unit 80 formed by the weight 83 placed on the acrylic resin plate 82 is indicated by a virtual line. The pressurizing unit 80 is adjusted so that the mass per 100 cm ² is 3.5 kg.

In order to measure the leaching amount of soluble components from the superabsorbent polymer particles 4 using the measurement article 1 based on FIGS. 6 and 7, water retention is performed for each superabsorbent polymer particle 4 to be measured. Magnification and soluble component content are measured in advance. In the article 1 of FIG. 6, the mass of the superabsorbent polymer particles 4 to be measured is determined so that the water absorption amount corresponding to the water retention ratio of the superabsorbent polymer particles 4 in the first joint region 6 is 4000 g / m ^2. . For example, when measuring the amount of exudation with respect to the superabsorbent polymer particles 4 having a water retention ratio of 40 g / g, the superabsorbent polymer particles 4 in the first joining region 6 of FIG. The used article 1 is used.
(4000 g / m ² ) / (40 g / g) = 100 g / m ²

The procedure for measuring the leaching amount of the soluble component for the article 1 is as follows.
(1) At least nine articles 1 are placed on a horizontal plate in a room at a temperature of 20 ° C. and a relative humidity of 75%.
(2) The artificial urine having a mass corresponding to the water retention ratio of the superabsorbent polymer particles 4 is slowly and uniformly poured into the first joint region 6 of the article 1 and absorbed by the superabsorbent polymer particles 4. For artificial urine, the following composition is used. That is, it is an aqueous solution containing 2% by mass of urea, 0.8% by mass of sodium chloride, 0.08% by mass of magnesium nitrate hydrate, and 0.03% by mass of calcium chloride hydrate.
(3) Thereafter, the article 1 is put in a polyethylene bag, sealed, and left in a room at 35 ° C. Further, the acrylic resin 82 to which the synthetic leather 81 is bonded is weighed to determine its mass X.
(4) Take out the stationary article 1 one by one, three hours later, and six hours later, and measure the amount of exudation by the following procedures (5) to (8).
(5) The taken article 1 is placed on a horizontal plate in a room at a temperature of 20 ° C. and a relative humidity of 75%.
(6) Place the pressure unit 80 (see FIG. 7) on the article 1 and leave it for 1 minute.
(7) Thereafter, the acrylic resin plate 82 to which the synthetic leather 81 is bonded is weighed to determine its mass Y.
(8) The amount Z of the soluble component leached from the article 1 and adhering to the synthetic leather 82 is obtained by the following equation.
Z = Y-X

The water retention ratio of the superabsorbent polymer particles 4 used in such measurement is measured by the following procedure.
(1) A super absorbent polymer particle having a mass W ₀ (g) is put in a nylon mesh bag and immersed in 1 liter of 0.9% physiological saline for 1 hour.
(2) Thereafter, the bag is suspended for 15 minutes to drain water, and then subjected to a centrifuge for 90 seconds at 850 rpm.
(3) The mass W ₁ (g) after treatment is obtained, and the water retention magnification H is calculated by the following equation.
H = (W ₁ −W ₀ ) / W ₀

  Tables 1 and 2 obtain commercially available superabsorbent polymer particles (SAP-A, B, C, D, E) having different water retention ratios, and the water retention ratio and soluble component content for each superabsorbent polymer particle. 2 shows the results of measuring the rate, the water absorption magnification under pressure, the water absorption rate, and the amount of leaching of soluble components, and the results of evaluating the feel of synthetic leather leached with soluble components.

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

As an example of the measurement method of the soluble component content, the measurement method when 2.0 g of superabsorbent polymer particles and 500 g of 0.9% physiological saline are used is as follows.
(1) Measurement environment Room temperature: 23 ± 2 ° C
Relative humidity: 75 ± 3%
(2) Tool 100ml glass beaker 2 glass beakers 1: Mass a ₁ g
Glass beaker 2: Mass a ₂ g
One 500 ml glass beaker 0.9% physiological saline Magnetic stirrer (3) Measurement procedure a. Place 500 g of 0.9% saline in a 500 ml beaker.
b. Rotate the magnetic stirrer at 600 rpm to stir 0.9% saline.
c. 2.0 g of superabsorbent polymer particles are collected, added to 0.9% physiological saline in step b, and stirred for 3 hours.
d. A mixture of the superabsorbent polymer particles and 0.9% physiological saline is filtered through a sieve having an opening of 75 μm, and the filtrate is recovered.
e. The filtrate was added to ADVANTEC No. 6 Suction-filter using filter paper and collect about 100 ml of filtrate.
f. About 80 ml of the collected filtrate was glass beaker No. 1 and weigh to determine the exact mass (bg) of the filtrate.
g. Glass beaker No. Add approximately 80 g of 0.9% saline to 2 and determine the exact mass (cg) of 0.9% saline.
h. Glass beaker No. 1, No. 1 No. 2 was put into a hot air dryer and heat-treated at 140 ° C. for 15 hours to dry the contents of each beaker. 1 and a glass beaker No. ₁ 2 of determining the total mass _{d 2.}
i. The dissolved component content (%) of the superabsorbent polymer particles is determined by the following formula.

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

0.9% saline solution to dryness:
R (g) = (d ₂ ) − (a ₂ )

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

Method of measuring water absorption magnification under pressure A test cylinder is prepared in which the bottom of an acrylic resin cylinder having an inner diameter of 30 mm and a height of 60 mm is made of a 250 mesh nylon net, and its mass is determined. 0.1 g of superabsorbent polymer particles are put in a test tube and weighed together with the test tube, and then the superabsorbent polymer particles are spread uniformly on the bottom surface of the test tube. The test cylinder is placed on a petri dish having a diameter of 200 mm, and has an outer diameter of 29 to 29.5 mm on the superabsorbent polymer particles so that the mass per unit area is 20 g / cm ^2. Put the weight that can be put into the. 20 ml of 0.9% physiological saline is poured into the petri dish, and the test tube is held for 60 minutes to allow the highly water-absorbing polymer particles to absorb 0.9% physiological saline. After 60 minutes, the test tube containing the superabsorbent polymer particles is weighed to determine the mass increment. The increment is multiplied by 10 to determine the amount of water absorption per gram of the highly water-absorbing polymer particles, and the amount of water absorption is taken as the water absorption capacity under pressure.

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

  In Table 2, the amount used for the superabsorbent polymer particles SAP-A to SAP-E used in the measurement article 1, and the water retention amount that is the product of the amount used and the water retention ratio in Table 1, The amount of leaching of the soluble component and the determination result of the quality of touch when the fingertip is brought into contact with the synthetic leather 82 (see FIG. 7) to which the leached soluble component is attached are shown. In Table 2, the amount of superabsorbent polymer particles used is adjusted so that the water retention amount in the table falls within the range of 4000 to 4200 g. The quality of the feeling is based on the determination result of a tester consisting of two men and three women who are between 40 and 60 years old. The determination result in Table 2 is very good. It means that the surface of the synthetic leather 82 was less sticky in any elapsed time up to 6 hours, and the surface of the synthetic leather 82 was low in stickiness, and the five testers did not have the unpleasant feeling that was slimy. ing. The judgment result is good, but the feeling that five testers were slimmed on the surface of the synthetic leather 82 in any elapsed time from 1 to 6 hours was acceptable. It means that. If the judgment result is bad, it means that 5 testers have an unacceptable feeling against the surface of the synthetic leather 82 in any of the elapsed time from 1 to 6 hours. Yes. In Table 2, the judgment result can be very good or good when the exudation amount does not exceed 80 mg. When the exudation amount was between 80 mg and 100 mg, the determination results of the five testers were not uniform, and the determination results of good and bad were mixed. When the exudation amount exceeded 100 mg, the judgment results of 5 people were all poor.

  FIG. 8 shows the relationship between the soluble component content in Table 1 and the exudation amount in Table 2. The soluble component content and the amount of exudation have a linearly changing relationship. When comparing the determination results of the feeling in Table 2 with FIG. 8, the superabsorbent polymer particles preferably have a soluble component content of 13 when the soluble component content does not exceed 15%. If the percentage does not exceed%, the touch determination result is good.

  The use 1 of the article 1 according to the present invention is not limited to disposable diapers, but is used in combination with a urine absorbing pad for use in combination with a diaper or a diaper cover, and pants for incontinence patients. It can be used as a urine absorbing pad. The article 1 can also be used as a wipe for absorbing and treating water and other water-absorbing articles. In the article 1 when used as a wipe, a water-permeable sheet piece is used as the lower layer sheet 3. It can be used, or a sheet piece of poor water permeability or water impermeability can be used.

DESCRIPTION OF SYMBOLS 1 Water absorbent article 2 Upper layer sheet 3 Lower layer sheet 4 High water absorption polymer particle 6 1st joining area | region (existence area of the required mass per unit area of high water absorption polymer particle)
7 Second bonding area (absence of required mass per unit area of superabsorbent polymer particles)
11 Hot melt adhesive for fixing polymer particles 12 Hot melt adhesive for sealing

Claims (9)

Of the upper layer sheet and the lower layer sheet that overlap, at least the upper layer sheet is water permeable, and is a water absorbent article in which highly water absorbent polymer particles are interposed between the opposing surfaces of the upper and lower layer sheets ,
The superabsorbent polymer particles, all SANYO never soluble component content measured by immersion in 0.9% saline is more than 15% of the weight of the superabsorbent polymer particles,
In the article, a plurality of first regions in which the required amount of the superabsorbent polymer particles are interposed between the opposing surfaces, and surrounding each of the plurality of first regions, the required amount can be interposed. A second region in which the upper and lower layer sheets are joined together,
The upper layer sheet includes a first upper layer sheet and a second upper layer sheet that overlap each other, and the first and second upper layer sheets are joined to each other in the first region, and are positioned between the adjacent first regions. The article is characterized by being non-bonded to each other at an intermediate portion of the second region . It further includes second superabsorbent polymer particles having a soluble component content of not exceeding 15% and a slow water absorption rate compared to the superabsorbent polymer particles, and in the first joining region, The article according to claim 1, wherein the superabsorbent polymer particles are located on the upper sheet side, and the superabsorbent polymer particles are located on the lower sheet side. The superabsorbent polymer particles are those in which the leaching amount of the soluble component does not exceed 80 mg when 0.9% physiological saline corresponding to the water retention ratio of the superabsorbent polymer particles is absorbed. The article according to claim 1 or 2 . The superabsorbent polymer particles, article according to claim 1 to 3 of which are bonded by means of hot melt adhesive to at least a portion one of the opposing surfaces of the upper and lower layer sheets.   The article according to any one of claims 1 to 4, wherein the superabsorbent polymer particles have a water retention ratio in the range of 10 to 50 g / g when 0.9% physiological saline is absorbed.   The article according to any one of claims 1 to 5, wherein the superabsorbent polymer particles have a water absorption capacity under pressure of at least 15 g / g when 0.9 physiological saline is absorbed.   The article according to any one of claims 1 to 6, wherein the superabsorbent polymer particles have a water absorption rate in the range of 1 to 50 seconds when 0.9% physiological saline is absorbed. At least one of the upper and lower layer sheets is formed of either a nonwoven fabric of thermoplastic synthetic fibers or an apertured film of thermoplastic synthetic resin, and the one sheet has a ventilation resistance value of 0.40 to 0.40. The article according to any one of claims 1 to 7, which is in the range of 0.04 KPa * s / m. Wherein the one of the opposing surfaces, the article of claim 4 wherein the superabsorbent polymer particles are joined at a rate of 30~300g / m ^2.

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