JP2013111326A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper in which the original absorbing ability of an absorbent polymer contained in an absorbent body is sufficiently demonstrated, and the leakage preventing property has been increased.SOLUTION: The disposable diaper 1 includes a front surface sheet 2, a rear surface sheet 3, and the absorbent body 4 which is arranged between those sheets 2 and 3. The disposable diaper 1 is divided into a belly side section A, a back side section B and a crotch section C. Between the front surface sheet 2 and the rear surface sheet 3 in the waist flap section of the back side section B, a sheet-like composite member 6 is included. The sheet-like composite member 6 includes: a front surface nonwoven fabric 62 comprising a hydrophobic fiber; and a rear surface nonwoven fabric 63 comprising a hydrophobic fiber, wherein the sheet-like composite member is formed in such a manner that an elastic member 61 under a stretched state in the width direction is arrange-fixed between the front surface nonwoven fabric 62 and the rear surface nonwoven fabric 63. The front surface nonwoven fabric 62 is made hydrophilic by applying a skin care agent containing a diamide derivative.

Description

  The present invention relates to a disposable diaper such as a deployment type and a pants type.

  Conventionally, a disposable diaper to which a skin care agent is applied is known in order to prevent skin troubles such as a skin irritation, eczema, and skin rash of a wearer.

  For example, Patent Document 1 describes a disposable diaper in which a skin care agent is directly applied to a surface that comes into contact with a wearer's skin. Patent Document 2 describes a disposable diaper having a water retaining agent-coated sheet coated with a water retaining agent on the back side of a skin contact sheet having a passage penetrating the front and back.

  When the skin care agent is applied like the disposable diaper described in Patent Document 1, the skin trouble of the wearer can be prevented, but the skin care agent is applied to the surface that contacts the wearer's skin. For this reason, the skin care agent easily shifts more than necessary to the skin side during wearing, and there is room for improvement from the viewpoint of durability of the effect.

  Moreover, the disposable diaper described in Patent Document 2 has a water retention agent holding sheet coated with a water retention agent on the back side of the skin contact sheet so that the water retention agent retention sheet does not directly contact the wearer's skin. As can be seen, in the disposable diaper described in Patent Document 2, the constituent fiber of the water retention agent holding sheet protrudes from the passage through the skin contact sheet, and the protruding constituent fiber allows the skin care agent to be applied to the skin side during wearing. Is formed to migrate. Therefore, in the disposable diaper described in Patent Document 2, the skin care agent shifted more than necessary to the skin side during wearing, and the effect could not be sustained.

  Separately from this, Patent Document 3 describes a stretched state between two hydrophilic sheets between a surface sheet and an absorbent body in order to absorb and diffuse sweat while wearing and to improve quick drying. A disposable diaper provided with a gathered portion formed by arranging the elastic member is disclosed. However, Patent Document 3 does not describe any application of a skin care agent.

JP 2004-255165 A JP 2009-005859 A JP 2010-246901 A

  Therefore, the object of the present invention is to improve the absorbability, diffusibility and quick-drying of sweat while wearing, while maintaining the effect of the skin care agent even after urination of the user in the disposable diaper to which the skin care agent is applied. It is to provide disposable diapers.

  The present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorber disposed between the sheets, and is divided into a ventral side, a back side, and a crotch. A disposable diaper, comprising a sheet-like composite member disposed between the top sheet and the back sheet in the waist flap portion of the back side, wherein the sheet-like composite member is made of hydrophobic fibers An elastic member in a state where the disposable diaper is stretched in the width direction is provided between the surface nonwoven fabric and the back surface nonwoven fabric. The disposable diaper is formed and fixed, and at least the surface nonwoven fabric is made hydrophilic by applying a skin care agent containing a diamide derivative.

  According to the disposable diaper of the present invention, the absorbability, diffusibility, and quick-drying of sweat during wearing are improved while the effect of the skin care agent is maintained even after the user urinates.

FIG. 1 is a plan view of an unfolded disposable diaper according to an embodiment of the present invention. FIG. 2 is a partially broken plan view of a main part of the disposable diaper of FIG. 3 is a cross-sectional view taken along line Y1-Y1 of FIG. FIG. 4 is an explanatory diagram for explaining the operation of the sheet-like composite member when the disposable diaper of FIG. 1 is worn.

  Hereinafter, the disposable diaper of this invention is demonstrated based on the preferable embodiment, referring FIGS. 1-4.

  As shown in FIG. 1, the disposable diaper 1 of the present embodiment (hereinafter also referred to as “diaper 1”) includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and these sheets 2, 3 is a disposable diaper having a vertically long absorbent body 4 disposed between the three and divided into an abdominal side A, a back side B, and a crotch C. The abdomen A is an area disposed on the abdomen of the wearer at the time of wearing, the back side B is an area disposed on the dorsal side of the wearer at the time of wearing, and the crotch C is the abdomen A It is an area arranged between the side parts B. Hereinafter, the diaper 1 will be described in detail.

As shown in FIGS. 1 to 3, the diaper 1 is formed symmetrically with respect to the center line CL. Accordingly, in the following description, the right side of the symmetrical part will be mainly described. Moreover, in this specification, a "skin contact surface" is a surface distribute | arranged to the wearer's skin side at the time of mounting | wearing among the front and back both surfaces of each member which comprises the diaper 1, and in FIG. It is the same surface as the “upper surface”. Moreover, a "non-skin contact surface" is a surface turned to the opposite side to the wearer's skin side at the time of mounting | wearing among the front and back both surfaces of each member which comprises the diaper 1, and " It is the same surface as the “lower surface”.
As shown in FIG. 1, the diaper 1 is also referred to as a longitudinal direction (hereinafter also referred to as “Y direction”) from the abdominal side A to the back side B via the crotch C. Y direction: parallel to the center line CL And a width direction (hereinafter also referred to as “X direction”) orthogonal to the longitudinal direction (Y direction).

As shown in FIG. 1, the diaper 1 is a so-called unfolded disposable diaper having a pair of left and right fastening tapes 7, 7 connected to left and right side edges of the back side portion B. The diaper 1 has a target sheet (not shown) for fastening the fastening tape 7 on the outer surface of the ventral side A.
In addition, as shown in FIG. 1, the diaper 1 has a long shape in the same direction as the vertically long absorbent body 4 in a state where the diaper 1 is expanded in a planar shape.

  As shown in FIG. 1, the diaper 1 is long in the longitudinal direction (Y direction), and both side edges in the longitudinal direction (Y direction) are bound inwardly in the central portion (inseam C) of the longitudinal direction (Y direction). The width of each end portion (back side portion B, ventral side portion A) in the longitudinal direction (Y direction) is larger than the width of the central portion (crotch part C) in the longitudinal direction (Y direction). Is also getting wider. As shown in FIGS. 1 and 2, the diaper 1 includes a top sheet 2 that forms the inner surface of the diaper 1, a back sheet 3 that forms the outer surface of the diaper 1, and an absorbent body 4 interposed between the sheets 2 and 3. And have. As shown in FIG. 1, each of the top sheet 2 and the back sheet 3 covers the entire surface of the absorbent body 4 on the skin contact surface side and the entire surface of the non-skin contact surface side, and extends from the periphery of the absorbent body 4. In the extended portion, it is fixed by an adhesive such as hot melt or by fusion such as heat sealing. The top sheet 2 is the same as the length of the back sheet 3 in the longitudinal direction (Y direction), but is shorter than the back sheet 3 in the width direction (X direction).

  In the diaper 1, as shown in FIG. 1, side sheets 5 are arranged on both side portions 1 s and 1 s along the longitudinal direction (Y direction) via a surface sheet 2. The side sheet 5 is disposed and fixed over the entire side portion 1S in the longitudinal direction (Y direction) on the skin contact surface side of the top sheet 2. The end of each side seat 5 in the X direction (near the center line CL) is a free end, and an elastic member 81 for forming a three-dimensional gather is disposed in the longitudinal direction (Y In a stretched state in the direction), when worn, a portion having a predetermined width from the free end is separated from the top sheet 2 by the contraction force of the elastic member, and a three-dimensional gather is formed.

  As shown in FIG. 1, the side sheet 5 and the back sheet 3 that extend outward in the width direction (X direction) are provided on both sides 1 s and 1 s of the diaper 1, respectively. And the side flap part 11 are formed. As shown in FIG. 1, the side sheet 5 and the back sheet 3 that extend outward in the width direction (X direction) are joined to the diaper 1 to form a leg flap portion 12. . An elastic member 82 for forming leg gathers is arranged and fixed in the longitudinal direction (Y direction) in the crotch C at the leg flap portion 12, and when worn, the elastic force of the elastic member causes the leg A gather is formed.

  As shown in FIG. 1, the absorbent body 4 has a rectangular shape that is long in the longitudinal direction (Y direction), and has a liquid-retaining absorbent core and a covering sheet such as tissue paper that wraps the absorbent core. The absorbent core is fixed to the cover sheet via an adhesive. As shown in FIGS. 2 and 3, the absorber 4 is disposed between the top sheet 2 and the back sheet 3. The absorber 4 and the back sheet 3 are bonded by applying a known adhesive such as hot melt in an intermittent pattern such as a spiral pattern.

The disposable diaper of the present invention includes a sheet-like composite member 6 disposed between the top sheet 2 and the back sheet 3 in the waist flap portion of the back side portion B. Here, the waist flap portion is a portion in which the top sheet 2 and the back sheet 3 are formed to extend in the front-rear direction from the front-rear edge of the absorber 4 as shown in FIG. Specifically, in the diaper 1, as shown in FIGS. 1-3, it is distribute | arranged between the surface sheet 2 and the back surface sheet 3 in the waist flap part of the back part B, Furthermore, the surface sheet 2 and the absorber 4 And a sheet-like composite member 6 disposed at a position covering the end of the absorbent body 4 in the longitudinal direction (Y direction). 1 and 2, the sheet-like composite member 6 of the diaper 1 is disposed on the waist flap portion of the back side portion B, and a part thereof is an end in the longitudinal direction (Y direction) of the absorbent body 4. In the width direction (X direction) so as to cover the part, it is arranged between both side flap parts 11, 11, and is further arranged between the root parts of the pair of fastening tapes 7, 7. Yes.
From the above viewpoint, the sheet-like composite member 6 is preferably disposed at least between both side flap portions 11, 11, but the absorbent core of the absorbent core constituting the absorbent body 4 is used. From the point of view, it is only necessary to cover the end of the absorbent body 4 in the longitudinal direction (Y direction).

  As shown in FIG. 2, the sheet-like composite member 6 may be disposed on the waist flap portion of the back side portion B. However, as shown in FIG. 3, the sheet-like composite member 6 of the diaper 1 has a longitudinal direction. In the (Y direction), the diaper 1 extends from the edge of the waist opening on the back side B side of the diaper 1 to the crotch C and beyond the outer edge in the longitudinal direction (Y direction) of the absorbent body 4. Are arranged. Further, as shown in FIG. 3, the sheet-like composite member 6 of the diaper 1 has a surface portion in the thickness direction extending from the edge of the waist opening to the outer edge of the absorbent body 4. A sheet which is arranged between the sheet 2 and the back sheet 3 and which is joined by a known adhesive applied in an intermittent pattern such as a spiral pattern and extends on the absorber 4 from the outer edge of the absorber 4 The portion of the sheet-like composite member 6 is disposed between the top sheet 2 and the absorber 4 and joined by a known adhesive applied in an intermittent pattern. Thus, the surface nonwoven fabric 62 which comprises the sheet-like composite member 6 is in contact with the surface sheet 2, and the upper surface of the surface nonwoven fabric 62 and the lower surface of the surface sheet 2 are bonded and fixed.

  The sheet-like composite member 6 has a surface nonwoven fabric 62 on the surface sheet 2 side made of hydrophobic fibers and a back surface nonwoven fabric 63 on the back sheet 3 side made of hydrophobic fibers, and between the surface nonwoven fabric 62 and the back surface nonwoven fabric 63, The elastic member 61 in a state of extending in the width direction (X direction) of the disposable diaper 1 is disposed and fixed. A gather is formed in the sheet-like composite member 6 thus formed. More specifically, the sheet-like composite member 6 of the diaper 1 has a rectangular shape extending in the X direction in the state extended in the X direction, and two surfaces having the same contour as that of the sheet-like composite member 6 at that time. A nonwoven fabric 62 and a backside nonwoven fabric 63 are provided. The two front nonwoven fabrics 62 and the back nonwoven fabric 63 are sheets of the same shape and size.

As the surface nonwoven fabric 62 and the back surface nonwoven fabric 63, it is a nonwoven fabric of single layer or multilayer structure comprised from hydrophobic fibers, such as a polyethylene fiber, a polyester fiber, and a polypropylene fiber, The fabric weight is the range of 10-30 g / m < ² >. It is preferable that it is a nonwoven fabric.

  The elastic members 61 constituting the sheet-like composite member 6 are arranged between the front nonwoven fabric 62 and the back nonwoven fabric 63 with an interval in the Y direction in an expanded state in the X direction. In particular, it is preferable that the spacing is 5 mm or less because it is possible to improve fit and reduce rubber marks.), And between the front surface nonwoven fabric 62 and the back surface nonwoven fabric 63 by a known adhesive applied in an intermittent pattern such as a spiral pattern. It is fixed with. Therefore, gathers are formed in the sheet-like composite member 6 due to the contraction of the elastic member 61.

  Regarding the plurality of elastic members 61 located in the region overlapping with the absorber 4 among all the elastic members 61, as shown in FIGS. 1 and 2, the plurality of elastic members 61 are divided into a plurality of pieces. The elastic member that is finely divided is preferably in a state that no longer has contraction force. This is because wrinkles are unlikely to occur in the absorber 4 due to the contraction of the elastic member 61.

The elastic member 61 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, A thread-like stretchable material made of a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene or the like, or natural rubber can be used, and a thread-like stretchable material made of polyurethane is particularly preferred. The thread-like elastic member 73 preferably has a single yarn size of 200 to 800 dtex, and more preferably 250 to 500 dtex. It is preferable to dispose such a thread-like elastic member 73 so as to have an expansion ratio of 20% or more, particularly 50% or more. The coating amount of an adhesive such as hot melt when the elastic member 61 is fixed to form the sheet-like composite member 6 is preferably 1.0 to 5.0 g / m ² .

The sheet-like composite member 6 of the present invention is hydrophilized by applying a skin care agent as a diamide derivative to at least the surface nonwoven fabric 62 of the hydrophobic surface nonwoven fabric 62 and the hydrophobic back nonwoven fabric 63. As described above, the surface nonwoven fabric 62 on the surface sheet 2 side of the sheet-like composite member 6 is hydrophilic, but is not formed by applying a skin care agent to the hydrophilic nonwoven fabric, and is composed of hydrophobic fibers. In addition, it was formed by applying a skin care agent, which is a diamide derivative, to the hydrophobic surface nonwoven fabric 62 to make it hydrophilic.
In the sheet-like composite member 6 of the diaper 1, not only is a hydrophobic surface nonwoven fabric 62 coated with a skin care agent, which is a diamide derivative, made hydrophilic but also a hydrophobic back surface nonwoven fabric 63. In addition, a skin care agent that is a diamide derivative is applied to make it hydrophilic. By setting it as such a structure, the skin care agent which can be supplied to skin can be increased, and the duration which can be supplied can be lengthened. In addition, the efficiency of sweat evaporation can be improved.

Further, as a hydrophilic treatment method of the hydrophobic back nonwoven fabric 63, in addition to a method of applying a skin care agent that is a diamide derivative to make it hydrophilic, various hydrophilic agents selected from surfactants for fiber use that are usually used are used. It may be applied and subjected to a hydrophilic treatment. The back surface nonwoven fabric 63 can be further improved in transpiration by performing a hydrophilic treatment so that the liquid diffusibility is higher than that of the front surface nonwoven fabric 62.
The liquid diffusibility can be measured by the following liquid diffusion area measurement method.

<Measurement method of liquid diffusion area>
A sample of each of the inner hydrophilic sheet 71 and the outer hydrophilic sheet 72 cut into 100 mm × 100 mm squares is placed on the acrylic plate, and 0.05 mL of colored water is dropped onto the acrylic plate from above 30 mm. After 10 minutes, the diffusion area of the colored water is measured using an image analyzer. The greater the measured value obtained, the higher the liquid diffusibility.
When the diffusion shape is the same, it can be easily grasped as the diffusion width, and the wider the diffusion width, the higher the liquid diffusibility.

As described above, the agent for forming at least the hydrophilic surface nonwoven fabric 62 constituting the sheet-like composite member 6 is a skin care agent containing a diamide derivative represented by the following formula (I).

  The diamide derivative represented by the above formula (I) is a diamide derivative of the invention described in International Publication No. WO00 / 61097, and has a medicinal effect of improving the moisture retention ability and barrier function of the stratum corneum. ing.

  Specific examples of particularly preferred diamide derivatives represented by the above formula (I) include the following Nos. 1-No. There are 15 compounds.

  Only one type of diamide derivative may be used, or two or more types of diamide derivatives may be used. If necessary, it can be used in combination with other skin care agents. As the other skin care agent, any skin care agent that does not interfere with the role as the hydrophilizing agent of the diamide derivative of the above formula (I) that forms the hydrophilic sheet-like composite member 6 can be used without particular limitation, For example, a polyhydric alcohol used as a moisturizing agent in the cosmetic field can be used. Specific examples of polyhydric alcohols that are humectants include alkanediol, caprylyl glycol, hexanediol, pentylene glycol, isoprene glycol, isopentyldiol, glycerin, diglycerin, polyglycerin, propylene glycol, dipropylene glycol, butylene. Polyhydric alcohols such as glycol, polyethylene glycol, methyl glutes, xylitol, sorbitol, maltitol, mannitol, erythritol are preferred. Since these polyhydric alcohols can be used together with the diamide derivative to improve the hydrophilicity of the diamide derivative, the sheet-like composite member 6 can easily absorb sweat during wearing, and the absorbed sweat is absorbed into the sheet-like composite member. 6 can be easily diffused. These polyhydric alcohols, when used on their own, are likely to be washed away by moisture such as sweat, causing a problem in sustaining the effect, but when used in combination with a diamide derivative, the effect is sustained because it is difficult to be washed away by moisture such as sweat. Good and good. In particular, glycerin, dipropylene glycol, propylene glycol, polyethylene glycol or butylene glycol can be preferably used, and propylene glycol can be particularly preferably used. The mixing ratio (propylene glycol / diamide derivative) of propylene glycol as a water retention component and the diamide derivative of the above formula (I) is 20/20 from the viewpoints of transferability to the skin, feel during use, sweat diffusibility, etc. It is preferable that it is 80-40 / 60 (weight%).

On the other hand, in order to improve the transpiration, if the back nonwoven fabric 63 is subjected to a hydrophilic treatment so that the liquid diffusibility is higher than that of the front nonwoven fabric 62, the application amount or combination of the diamide derivative and the polyhydric alcohol is selected. Thus, the back nonwoven fabric 63 may be made more hydrophilic.
For example, when the diamide derivative is applied to each of the front nonwoven fabric 62 and the back nonwoven fabric 63, the liquid diffusibility of the back nonwoven fabric 63 can be enhanced by applying more diamide derivatives to the back nonwoven fabric 63 than the front nonwoven fabric 62. Further, when a diamide derivative is applied to each of the front nonwoven fabric 62 and the back nonwoven fabric 63, for example, a diamide derivative is applied to the front nonwoven fabric 62, and a mixture of the diamide derivative and the polyhydric alcohol is applied to the back nonwoven fabric 63. It is preferable that the surface nonwoven fabric 62 and the back surface nonwoven fabric 63 are coated with a mixture of the diamide derivative and the polyhydric alcohol. A high skin care agent may be applied to make it hydrophilic. Furthermore, the surface nonwoven fabric 62 and the back surface nonwoven fabric 63 are made hydrophilic by using different diamide derivatives with different carbon numbers or using different combinations of the diamide derivative and the polyhydric alcohol used. Can do. Thus, when hydrophilized, compared with the surface nonwoven fabric 62, the liquid diffusibility of the back surface nonwoven fabric 63 can be improved.
Further, only the diamide derivative is used for the front surface nonwoven fabric 62, and the back surface nonwoven fabric 63 is coated with a mixture of a diamide derivative and propylene glycol, glycerin, dipropylene glycol, polyethylene glycol or butylene glycol, so that the back surface nonwoven fabric 62 is compared with the front surface nonwoven fabric 62. The diffusibility of 63 can be increased. Further, when a mixture of a diamide derivative and propylene glycol, glycerin, dipropylene glycol, polyethylene glycol or butylene glycol is applied to the front nonwoven fabric 62 and the back nonwoven fabric 63, the back nonwoven fabric 63 has a diamide derivative more than that used for the front nonwoven fabric 62. The diffusibility of the back surface nonwoven fabric 63 can be made higher than that of the front surface nonwoven fabric 62 by applying a material having a low content.

  The retention of the diamide derivative of the above formula (I) in the hydrophilic sheet-like composite member 6 is performed by charging a solid or semi-solid hydrophilizing agent into the tank of the coating device (applicator) at room temperature and heating it. After improving the fluidity, the hydrophobic surface nonwoven fabric 62 and the hydrophobic back nonwoven fabric 63 are each coated. After coating the front surface nonwoven fabric 62 and the back surface nonwoven fabric 63 with the hydrophilizing agent, the hydrophilizing agent becomes solid or semi-solid by leaving it at room temperature, and the hydrophilizing agent adheres to the front surface nonwoven fabric 62 and the back surface nonwoven fabric 63, respectively. To maintain the hydrophilicity.

  Examples of the coating method include a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, and a bead method.

The coating amount of the diamide derivative of the above formula (I) (meaning the coating amount in the region where the agent is actually applied) is the viewpoint of the transferability to the skin, the skin care effect, and the feeling during use. From the above, when the diamide derivative is applied to each of the front nonwoven fabric 62 and the back nonwoven fabric 63, it is preferably applied to each of the front nonwoven fabric 62 and the back nonwoven fabric 63 in the range of 0.5 to 20 g / m ^2. More preferably, it is applied in the range of ˜15 g / m ² .

The formation material of the disposable diaper 1 of this embodiment is demonstrated.
As the surface sheet 2, the back sheet 3, and the absorbent body 4, each can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, a hydrophilic and liquid-permeable non-woven fabric can be used as the top sheet 2, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a non-woven fabric is used as the back sheet 3. As the absorbent body 4, an aggregate of fibers such as pulp fibers (which may be a non-woven fabric) or an absorbent core in which particles of a water-absorbing polymer are held is used as a water-permeable thin paper or non-woven fabric. The thing coated with the core wrap sheet which consists of can be used. As the side sheets 5 forming the three-dimensional gathers and the leg gathers, they can be used without particular limitation as long as they are usually used in absorbent articles such as disposable diapers. Those laminated sheets can be used.

As the elastic member 81 for forming a three-dimensional gather and the elastic member 82 for forming a leg gather, like the elastic member 61 constituting the sheet-like composite member 6, it is usually used for an absorbent article such as a disposable diaper. For example, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, thread-like stretchability made of polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, etc. Materials and natural rubber can be used.
The fastening tape 7 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, as a hook material constituting the fastening tape 7, “Magic tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu (registered trademark)” (Kanebo) The male member etc. in the bell touch company etc. can be used.

The effect at the time of using the disposable diaper 1 (henceforth "diaper 1") which is embodiment of this invention mentioned above is demonstrated.
The sheet-like composite member 6 to which the skin care agent of the diaper 1 is applied is covered with the surface sheet 2 as shown in FIG. Since the skin care agent is not easily transferred more than necessary, and the skin care agent is attached to each of the front nonwoven fabric 62 and the back nonwoven fabric 63, the durability of the skin care effect is improved. In particular, since the skin care agent applied to the sheet-like composite member 6 contains the diamide derivative represented by the above formula (I), it is difficult for the skin care agent to be washed away with sweat, so the durability of the skin care effect is improved. Moreover, since the sheet-like composite member 6 expands and contracts with the movement of the wearer of the diaper 1 as shown in FIG. 4, the hydrophilic sheet-like composite member 6 of the diaper 1 easily absorbs sweat during wearing. The absorbed sweat is easy to diffuse. Further, since the front nonwoven fabric 62 and the back nonwoven fabric 63 constituting the hydrophilic sheet-like composite member 6 are originally nonwoven fabrics composed of hydrophobic fibers, the fibers themselves do not retain sweat during wearing. The quick-drying property of the absorbed sweat is also improved by the stretching action of the sheet-like composite member 6 accompanying the movement of the wearer of the diaper 1.

  Moreover, since the surface nonwoven fabric 62 which comprises the sheet-like composite member 6 is contacting the surface sheet 2, as the diaper 1 is shown in FIG. 3, the sweat during diaper wear is hydrophilic sheet form from the surface sheet 2 It is easy to move to the composite member 6. Therefore, the diaper 1 is easier to absorb sweat while wearing.

  Moreover, since the sheet-like composite member 6 is distribute | arranged between the root parts of a pair of fastening tapes 7 and 7, as shown in FIG. 2, the diaper 1 is a sheet | seat with the movement of the wearer of the diaper 1. The elastic composite member 6 easily expands and contracts, the absorbed sweat is more easily diffused, and the quick drying property of the absorbed sweat is further improved.

  The disposable diaper of this invention is not restrict | limited at all to the diaper 1 of this embodiment mentioned above, It can change suitably.

  For example, in the disposable diaper 1 of the above-described embodiment, the hydrophilizing agent (diamide derivative of the above formula (I)) is applied over the entire surface of the front nonwoven fabric 62 and the back nonwoven fabric 63. Thus, in the case of the sheet-like composite member 6 that is long in the X direction between the root portions of the pair of fastening tapes 7, 7, the hydrophilizing agent is applied to a portion that easily contacts the wearer's skin. You may do it.

  Moreover, although the disposable diaper 1 of the above-mentioned embodiment was a deployment-type disposable diaper, a pants-type disposable diaper may be sufficient.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
One sheet of SMS nonwoven fabric (composite nonwoven fabric in which spunbond nonwoven fabric (S) and meltblown nonwoven fabric (M) are combined) (weight per unit area 15 g / m ² ) composed of hydrophobic fibers made of polypropylene fibers is represented by the above formula ( The diamide derivative of II) was soaked in a solution obtained by dissolving and diluting with ethanol, and then allowed to stand for 24 hours in an environment of room temperature of 40 ° C. and humidity of 80%, followed by volatile drying to stabilize the coating state. The coating amount of the diamide derivative was adjusted so that the coating basis weight was 1.8 g / m ² . Thus, the hydrophilic nonwoven fabric of Example 1 was produced.

[Example 2]
A hydrophilic nonwoven fabric of Example 2 was produced in the same manner as Example 1 except that the coating amount of the diamide derivative was adjusted to be a coating basis weight of 9.5 g / m ² .

Example 3
The same non-woven fabric as that used in Example 1 was used, and the non-woven fabric was dipped in a solution obtained by dissolving and diluting the diamide derivative of the above formula (II) and propylene glycol with ethanol, and then volatile-dried in the same manner as in Example 1. To stabilize the coating state. The coating amount of the diamide derivative is adjusted to the coating basis weight of 9.5 g / m ^2, the coating amount of propylene glycol was adjusted to a coating basis weight 2.5 g / m ^2. Thus, the hydrophilic nonwoven fabric of Example 3 was produced.

[Comparative Example 1]
The nonwoven fabric used in Example 1, that is, a hydrophobic SMS nonwoven fabric composed of hydrophobic fibers made of polypropylene fibers (a composite nonwoven fabric in which a spunbond nonwoven fabric (S) and a meltblown nonwoven fabric (M) are combined), The nonwoven fabric of Comparative Example 1 was obtained.

[Evaluation]
About the nonwoven fabric in each Example and a comparative example, the diffusibility and quick-drying property of the liquid were measured with the following method. The obtained results are shown in Table 1.

The nonwoven fabric of each Example and Comparative Example was set on the hot plate, and then water (0.1 mL) was injected between the non-woven fabric and the hot plate using a syringe. And time (drying time) until the said nonwoven fabric dries was measured. Further, along with the measurement of the drying time, the diffusion width (maximum width) of the liquid at that time was measured.
As the hot plate, a hot plate (area: 10 × 10 cm ² , temperature: 33 ° C.) made by Kato Tech Co., Ltd .: KES-F7 (THERMO LABO II) was used. The measurement environment was 23 ° C. and 50% RH.
The drying time was determined from the heat dissipation amount of the hot plate. That is, after injecting water into the nonwoven fabric of each Example and Comparative Example, the amount of heat release increases, and when all the water evaporates and the nonwoven fabric dries, the amount of heat release decreases to the value before water injection. The time from the injection of water into the nonwoven fabric until the amount of heat released before the injection of water was defined as “drying time (single injection)”. The measured value is an average value of n = 2. The obtained results are shown in Table 1.

  Further, after measuring the drying time (single injection), the nonwoven fabrics of the examples and comparative examples were set on the hot plate again, and water (0) was measured in the same manner as the measurement of the drying time (single injection). .1 mL) was injected, and the time until drying (drying time (twice injection)) was measured. In addition to the measurement of the drying time (drying time (twice injection)), the diffusion width (maximum width) of the liquid at that time was measured. The obtained results are shown in Table 1.

  Furthermore, regarding the nonwoven fabric of Example 1, after measuring the above-mentioned drying time (twice injection), the nonwoven fabric was washed with tap water for 10 seconds assuming the influence of the flow of the agent during urination. And the nonwoven fabric of Example 1 washed away with water is set on a hot plate again like the measurement of the above-mentioned drying time (single injection), water (0.1 mL) is inject | poured, and it dries. Time (drying time) was measured. Further, along with the measurement of the drying time, the diffusion width (maximum width) of the liquid at that time was measured. The obtained results are shown in Table 1.

As is clear from the results in Table 1, it was found that the nonwoven fabric of each example was excellent in diffusibility and quick drying compared to the nonwoven fabric of the comparative example. In addition, the nonwoven fabric of each example has almost no difference in drying time (single injection) and drying time (double injection), and in particular, the nonwoven fabric of Example 1 has good diffusion even after being washed away with tap water. It was found that the property and quick-drying can be maintained.
As is apparent from the results in Table 1, when the sheet-like composite member is formed using the nonwoven fabric of each example and a disposable diaper is formed using the sheet-like composite member, the effect of the skin care agent even after the user urinates Can be expected to be maintained, and sweat absorption, diffusibility, and quick drying during wear can be expected to improve.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 1S Side part along a longitudinal direction (Y direction) 11 Side flap part 12 Leg flap part 2 Top sheet 3 Back sheet 4 Absorber 5 Side sheet 6 Sheet-like composite member 61 Elastic member 62 Surface nonwoven fabric 63 Back surface nonwoven fabric 7 Fastening Tape 81 Elastic member 82 for forming three-dimensional gathers Elastic member A for forming leg gathers Abdominal side, B dorsal side, C crotch CL Centerline extending in the longitudinal direction of the diaper

Claims (6)

Disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorber disposed between the sheets, and is divided into a ventral side, a back side, and a crotch There,
A sheet-like composite member disposed between the top sheet and the back sheet in the waist flap part of the back side part;
The sheet-like composite member has a surface nonwoven fabric on the topsheet side made of hydrophobic fibers and a backside nonwoven fabric on the backsheet side made of hydrophobic fibers, and the disposable sheet is disposed between the surface nonwoven fabric and the backside nonwoven fabric. An elastic member in a state of extending in the width direction of the diaper is arranged and fixed,
At least the surface nonwoven fabric is a disposable diaper in which a skin care agent containing a diamide derivative is applied to make it hydrophilic.   The disposable diaper according to claim 1, wherein different skin care agents are applied to the surface nonwoven fabric and the back sheet to make them hydrophilic.   The disposable diaper according to claim 1 or 2, wherein the back nonwoven fabric is subjected to a hydrophilic treatment so that the liquid diffusibility is higher than that of the front nonwoven fabric.   The disposable diaper according to any one of claims 1 to 3, wherein the skin care agent contains a polyhydric alcohol in addition to the diamide derivative.   The disposable diaper according to claim 4, wherein the surface nonwoven fabric is hydrophilized by applying a skin care agent having a higher content of the diamide derivative than the back nonwoven fabric.   The disposable diaper according to claim 4 or 5, wherein the polyhydric alcohol is propylene glycol, glycerin, dipropylene glycol, polyethylene glycol or butylene glycol.

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