JP6298560B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

In recent years, techniques have been proposed for enhancing the feeling of wear, such as dryness, for non-woven fabrics used for surface sheets that touch the skin of absorbent articles.
For example, in the sanitary napkin described in Patent Documents 1 and 2, a blood slipperiness imparting agent is included in the top sheet from the viewpoint of making the top sheet after menstrual blood absorption smooth. The blood slipperiness-imparting agent has a certain affinity with menstrual blood and is said to be able to migrate into the absorber together with menstrual blood.

JP 2013-212283 A JP 2014-68934 A

The nonwoven fabric used for the surface sheet (the top sheet) that is the skin contact member of the absorbent article has a narrow region between the fibers. Even if there is a space in the area that can pass excretory fluid (for example, urine and menstrual blood, also simply liquid), meniscus force between fibers, surface activity by plasma proteins, and blood surface viscosity are high. A stable liquid film is formed between the fibers, and the liquid tends to stay. In the prior art, the liquid film cannot be completely eliminated, and there is still room for improvement in the dryness. Furthermore, in recent years, in addition to dryness, consumers are demanding good touch. Therefore, the use of fine fibers has been performed. However, when thin fibers are used, the distance between the fibers becomes narrower. As a result, a liquid film between the fibers is more likely to be generated, and the liquid film is not easily ruptured, so that the liquid is more likely to remain.
In addition, the absorption target liquid is not limited to blood. For example, since urine also has surface activity due to phospholipids, a liquid film is formed in the same manner as described above, leading to liquid residue, and there is still room for improvement in dryness.
Therefore, there is a demand for a technique for removing a liquid film that can form a narrow portion between fibers in a nonwoven fabric. However, it was difficult to remove due to the high stability of the liquid film. It is also conceivable to apply a water-soluble surfactant in order to lower the surface tension of the liquid and remove the liquid film. However, when such a surfactant is used for an absorbent article to enable removal of a liquid film, there is a possibility that the liquid may permeate the liquid leakproof back sheet.
In addition, from the viewpoint of liquid permeability in the surface sheet, an appropriate hydrophilic property is required on the nonwoven fabric surface forming the surface sheet so that the liquid can easily enter between the fibers. If the hydrophilicity on the surface is too low, there is a high possibility that a liquid flow occurs on the surface before the liquid enters between the fibers. The liquid flow may lead to liquid leakage at the time of mounting on the absorbent article, and improvement of the leak-proof property of the absorbent article from this viewpoint is required.

  In view of the above-described problems, the present invention relates to an absorbent article that has improved leakage prevention while reducing the liquid film formed between the fibers of the top sheet to achieve a higher liquid level reduction.

  The present invention is an absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet, the absorbent article being excreted by the wearer on the skin contact surface side. An excretion opening facing portion facing the mouth, a thickness recessed portion of the topsheet and the absorber, which is disposed continuously or discontinuously in a surface direction so as to surround the excretion opening facing portion, the thickness recessed portion and the excretion An excretory fluid diffusion region between the mouth facing portion, the topsheet has a liquid film cleaving agent-containing portion and a non-containing portion, and the excretion mouth facing portion has the containing portion. An absorbent article is provided.

Moreover, this invention is an absorbent article which has a surface sheet, a back sheet, and the absorber between the said surface sheet and a back sheet, Comprising: The said absorbent article is a wearer on the skin contact surface side. An excretion opening facing portion facing the excretion opening, a thickness recessed portion of the topsheet and the absorber, which is disposed continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion, and the thickness recessed portion, An excretory liquid diffusion region between the excretory mouth facing portion, the topsheet has a containing portion and a non-containing portion of the following compound C1, and the containing portion is included in the excretory mouth facing portion. An absorbent article is provided.
[Compound C1]
A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.

Moreover, this invention is an absorbent article which has a surface sheet, a back sheet, and the absorber between the said surface sheet and a back sheet, Comprising: The said absorbent article is a wearer on the skin contact surface side. An excretion opening facing portion facing the excretion opening, a thickness recessed portion of the topsheet and the absorber, which is disposed continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion, and the thickness recessed portion, An excretory liquid diffusion region between the excretory mouth facing portion, the topsheet has a containing portion and a non-containing portion of the following compound C2, and the containing portion is included in the excretory mouth facing portion. An absorbent article is provided.
[Compound C2]
A compound having a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and an interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less. .

  The absorbent article of the present invention can improve the leak-proof property while reducing the liquid film formed between the fibers of the top sheet and realizing a lower liquid residue at a higher level.

It is the partially notched top view which showed typically the sanitary napkin as preferable one Embodiment of the absorbent article which concerns on this invention from the skin surface direction. It is explanatory drawing which shows typically the other specific example of a thickness recessed part with the external shape of the sanitary napkin shown in FIG. About the crotch part of the surface sheet which concerns on this embodiment, one embodiment of the combination with the excretion opening | mouth opposing part from which the area ratio of the containing part of a liquid film cleaving agent differs, an excretion liquid spreading | diffusion area | region, and the thickness recessed part made into the non-containing part FIG. It is a partially expanded plan view which shows other preferable embodiment of the nonwoven fabric which comprises the surface sheet which concerns on this invention, (A) is a non-containing part of a grid | lattice-like non-containing part in the nonwoven fabric surface, (B) shows a pattern in which a plurality of non-contained portions in the shape of rhombus are arranged apart from each other on the surface of the nonwoven fabric. It is a partially expanded plan view which shows other preferable embodiment of the nonwoven fabric which comprises the surface sheet which concerns on this invention, (A) is a containing part extended in the longitudinal direction of a nonwoven fabric surface, and a non-containing part in the width direction. The pattern alternately arranged is shown, and (B) shows the pattern alternately arranged in the longitudinal direction of the containing part and the non-containing part extending in the width direction of the nonwoven fabric surface. When drawing the virtual line along the width direction of the nonwoven fabric which comprises a surface sheet arbitrarily, it is explanatory drawing which the length of the containing part on this virtual line shows typically the length of a non-containing part, (A) 1 shows a partially enlarged view of the pattern of FIG. 1, (B) shows a pattern in which the containing portion of (A) is elliptical, (C) shows a partially enlarged view of the pattern of FIG. D) shows the pattern of FIG. It is a schematic diagram which shows the liquid film formed in the clearance gap between the fibers of the nonwoven fabric which comprises a surface sheet. (A1)-(A4) is explanatory drawing which shows typically the state which the liquid film cleaving agent which concerns on this invention cleaves a liquid film from a side surface, (B1)-(B4) is the liquid which concerns on this invention It is explanatory drawing which shows typically the state which a film | membrane cleaving agent cleaves a liquid film from upper direction. It is sectional drawing of the nonwoven fabric which shows the preferable aspect (1st embodiment) of the nonwoven fabric which comprises a surface sheet.

About the absorbent article which concerns on this invention, the sanitary napkin 10 as the preferable embodiment is shown, and it demonstrates below, referring drawings.
In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface side, the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin surface side, the non-skin contact surface side or the back surface side. That's it. The direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. Moreover, the normal line direction of the surface or back surface of an absorbent article is called thickness direction, and the quantity is called thickness.

  As shown in FIG. 1, a sanitary napkin 10 (hereinafter, also simply referred to as a napkin 10) of the present embodiment is a liquid-permeable surface sheet 1 disposed on the skin contact surface side, the non-skin contact surface side. And a liquid-retaining absorbent 3 disposed between the two sheets. Further, a pair of water-repellent side sheets 4 covers the skin contact surface sides on both sides in the longitudinal direction of the top sheet 1 and extends outward in the width direction. The side sheet 4 extending in the width direction is joined to the top sheet 1 and the back sheet 2 without the absorber 3 interposed therebetween. In the present embodiment, among the side sheet 4 and the back sheet 1 that extend in the width direction, the center portion in the longitudinal direction extends further in the width direction to form a pair of wing portions 5 and 5. The arrangement position of the wing part 5 may not necessarily be a central part in the longitudinal direction, and can be appropriately changed according to the length of the napkin set according to the purpose of use and the like. Moreover, the wing part 5 is provided arbitrarily and the form which does not have may be sufficient.

  The sanitary napkin 10 has a vertically long shape having a vertical direction (Y direction) and a horizontal direction (X direction) orthogonal to the vertical direction. The napkin 10 is arranged with the top sheet 1 side facing the wearer's skin contact surface side and the vertical direction (Y direction) extending from the lower abdomen side to the buttocks side, and the width direction (X direction) between the left and right legs. It is worn in the direction of the connection. Corresponding to the above-mentioned wearing state, the napkin 10 has a crotch part C covering the excretion part of the wearer in the vertical direction (Y direction), a front part F corresponding to the lower abdomen side in front of the crotch part C, and a rear part. It is divided into a rear part R corresponding to the buttocks side. In the present embodiment, a portion sandwiched between the pair of wing portions 5 and 5 is a crotch portion C, and front and rear portions thereof are a front portion F and a rear portion R.

  The division of the crotch part C, the front part F, and the rear part R can be changed as appropriate according to the length of the napkin and the like as in the position of the wing part 5 described above. The sanitary napkin 10 of the present embodiment shows an example of a shape set for daytime or the like, and the front part F, the crotch part C, and the rear part R are divided into about three equal lengths in the vertical direction. Is set. As a specific example different from this, for example, for night use, there is a shape having a wide rear flap that covers the buttocks, and the rear part R is longer than the front part F and the crotch part C (not shown). . In this case, the crotch C is closer to the front of the napkin. In general, the crotch part C can be set as a part at a certain distance from the front part F regardless of the shape of the napkin 10.

  In the sanitary napkin 10, the top sheet 1 is made of a hydrophilic nonwoven fabric and has a liquid film cleaving agent containing part 6 and a non-containing part 7. In addition, the specific arrangement | positioning of the containing part 6 and the non-containing part 7 can take various, and is not shown in FIG. 3-7, some specific examples of the area | region 18 where the containing part 6 and the non-containing part 7 of the liquid film cleaving agent are mixedly arranged are shown.

The containing part 6 and the non-containing part 7 are classified according to the presence or absence of a liquid film cleaving agent. In addition, in FIGS. 3-6 mentioned later, although the pattern is attached | subjected and shown to the containing part 6 for the understanding of the arrangement | positioning area | region and arrangement pattern of the containing part 6 and the non-containing part 7, it can actually distinguish by visual observation. Not necessarily.
Therefore, the classification of the above-mentioned containing part 6 and non-containing part 7 is confirmed not by visual observation but by the following method. That is, after destined paper and toasted to the surface of the top sheet 1, carrying the acrylic plate having a thickness of 4 mm, for 30 seconds load in weight so that the 600 g / cm ² from above. Immediately after the loading, the oil-blotting paper is peeled off, and the oil-blotting paper is placed on a black mount and the color change is visually confirmed. The part where the color has changed is the containing part 6 containing the liquid film cleaving agent, and the other part is the non-containing part 7. Various materials can be used as the above-mentioned oil blotting paper, and examples thereof include gold leaf punching paper manufacturing oil blotting paper manufactured by Katani Sangyo Co., Ltd.
The above method for confirming the classification is similarly used in the measurement of the area ratio of the containing portion 6.

  The liquid film cleaving agent contained in the containing portion 6 is a liquid film formed between the fibers or on the fiber surface when a liquid, for example, highly viscous liquid such as menstrual blood or excretion liquid such as urine touches the surface sheet 1. It refers to an agent that inhibits the formation of a liquid film by cleaving it, and has an action of cleaving the formed liquid film and an action of inhibiting the formation of the liquid film. The former can be called the main action, and the latter can be called the subordinate action. The cleaving of the liquid film is performed by the action of the liquid film cleaving agent to destabilize by pushing away a part of the liquid film layer. By the action of the liquid film cleaving agent, the liquid can easily pass through without staying in a narrow region between the fibers of the nonwoven fabric. That is, the liquid film cleaving agent containing portion 6 is a portion having excellent liquid permeability in the surface sheet 1. Thereby, even if the fiber which comprises the nonwoven fabric of the surface sheet 1 is made thin and the distance between fibers is narrowed, softness of touch and liquid remaining suppression are compatible.

(Characteristic of disappearing liquid film)
The liquid film cleaving agent used in the present invention has the property of eliminating the liquid film, and due to this property, the liquid film cleaving agent is applied to a test liquid or artificial urine mainly composed of plasma components. Moreover, the liquid film disappearance effect can be expressed. Artificial urine is 1.940% by weight of urea, 0.795% by weight of sodium chloride, 0.110% by weight of magnesium sulfate, 0.062% by weight of calcium chloride, 0.197% by weight of potassium sulfate, red No. 2 (dye) 0 The surface tension of a mixture having a composition of 0.010% by weight, water (about 96.88% by weight) and polyoxyethylene lauryl ether (about 0.07% by weight) was adjusted to 53 ± 1 mN / m (23 ° C.). Is. The liquid film disappearance effect here refers to the effect of inhibiting the liquid film formation of the structure and the formed structure of the structure in which air is held by the liquid film formed from the test liquid or artificial urine. It can be said that an agent that exhibits both of the effects of disappearing the body and that exhibits at least one of the effects has the property of exhibiting the effect of disappearing the liquid film.
The test solution is a liquid component extracted from equine defibrinated blood (manufactured by Nippon Biotest Co., Ltd.). Specifically, when 100 mL of equine defibrinated blood is allowed to stand at a temperature of 22 ° C. and a humidity of 65% for 1 hour, the equine defibrinated blood is separated into an upper layer and a lower layer. It is. The upper layer mainly contains plasma components, and the lower layer mainly contains blood cell components. In order to take out only the upper layer from the equine defibrinated blood separated into the upper layer and the lower layer, for example, a transfer pipette (manufactured by Nippon Micro Corporation) can be used.
Whether or not a certain agent has the above-mentioned property of “disappearing the liquid film” depends on the occurrence of a structure in which air is trapped by the liquid film formed from the test solution or artificial urine to which the agent is applied. This is judged by the amount of the structure, that is, the liquid film when the state is easy. That is, the test solution or artificial urine is adjusted to a temperature of 25 ° C., and then 10 g is put into a screw tube (No. 5 body diameter 27 mm, total length 55 mm, manufactured by Maruemu Co., Ltd.) to obtain a standard sample. In addition, a measurement sample obtained by adding 0.01 g of an agent to be measured, which is adjusted in advance to 25 ° C., to the same sample as the standard sample is obtained. The standard sample and the measurement sample are vigorously shaken twice in the vertical direction of the screw tube, and then quickly placed on a horizontal plane. By shaking the sample, the structure of the liquid layer (lower layer) without the structure and a large number of structures formed on the liquid layer (the lower layer) is formed inside the screw tube after shaking. Upper layer). After the elapse of 10 seconds immediately after shaking, the height of the structure layers of both samples (the height from the liquid surface of the liquid layer to the upper surface of the structure layer) is measured. Then, when the height of the structure layer of the measurement sample is 90% or less with respect to the height of the structure layer of the standard sample, it is assumed that the agent to be measured has a liquid film cleavage effect.
The liquid film cleaving agent used in the present invention satisfies the above properties by a single compound that applies to the above properties, a mixture of a plurality of single compounds that apply to the above properties, or a combination of a plurality of compounds (liquid Agent capable of developing membrane cleavage). That is, the liquid film cleaving agent is an agent limited to those having a liquid film cleaving effect as defined above. Therefore, when the compound applied in the absorbent article contains a third component that does not meet the above definition, it is distinguished from a liquid film cleaving agent.
In addition, regarding the liquid film cleaving agent and the third component, the “single compound” is a concept including compounds having the same composition formula but having different molecular weights due to different numbers of repeating units.
As the liquid film cleaving agent, it can be appropriately selected from those described in paragraphs [0007] to [0186] of the specification of International Publication No. 2016/098796.

That the containing part 6 of the topsheet 1 contains or contains a liquid film cleaving agent mainly means that it is attached to the surface of the fiber. However, as long as the liquid film cleaving agent remains on the surface of the fiber, there may be a liquid film cleaving agent that is encapsulated in the fiber or that is present inside the fiber by internal addition. As a method for attaching the liquid film cleaving agent to the fiber surface, various commonly used methods can be employed without any particular limitation. For example, flexographic printing, ink jet printing, gravure printing, screen printing, spraying, brush coating method and the like can be mentioned. These treatments may be carried out after the fibers are made into a web by various methods, and then after the web is made into a nonwoven fabric or incorporated into an absorbent article. The fiber having the liquid film cleaving agent attached to the surface is dried at a temperature sufficiently lower than the melting point of the fiber resin (for example, 120 ° C. or less) by, for example, a hot air blowing type dryer. Moreover, when attaching to a fiber using the said attachment method, you may use the solution containing the liquid film cleaving agent which dissolved the liquid film cleaving agent in the solvent if necessary, or the emulsion of liquid film cleaving agent, and a dispersion liquid. .
In order for the liquid film cleaving agent to have a liquid film cleaving effect, which will be described later, in the nonwoven fabric, the liquid film cleaving agent needs to exist as a liquid when it comes into contact with body fluid. From this point, the melting point of the liquid film cleaving agent according to the present invention is preferably 40 ° C. or less, and more preferably 35 ° C. or less. Furthermore, the melting point of the liquid film cleaving agent according to the present invention is preferably −220 ° C. or higher, more preferably −180 ° C. or higher.

  As will be described later, the surface tension of the liquid film cleaving agent is smaller than that of a conventional hydrophilizing agent used for nonwoven fabric fibers. That is, the contact angle of the constituent fibers of the containing part 6 is larger than the contact angle of the constituent fibers of the non-containing part 7. Therefore, the constituent fibers of the containing portion 6 are given lubricity or hydrophobicity by the liquid film cleaving agent, and increase the slidability of excretory liquid on the surface of the topsheet 1 as compared with the case without the liquid film cleaving agent. In particular, when the effluent is first received from a dry surface, the effluent tends to flow out of the surface. On the other hand, since the non-containing part 7 does not have a liquid film cleaving agent, it acts to prevent the excretory liquid from flowing out on the surface of the top sheet 1.

  Thus, the surface sheet 1 has the containing part 6 which reduces the residual of the excretory liquid as a liquid film by the action of the liquid film cleaving agent, and the non-containing part 7 which suppresses the surface flow of the excretory liquid on the surface sheet 1. . The surface sheet of the sanitary napkin 10 is appropriately disposed by including the containing part 6 and the non-containing part 7 in accordance with the functions of the excretory opening facing part 11, the excretory liquid diffusion region 12 and the thickness recessed part 8 of the top sheet 1. Leakage can be improved while reducing the liquid film formed between the fibers and reducing the liquid residue at a higher level.

  About preferable arrangement | positioning of the containing part 6 and the non-containing part 7 of a liquid film cleaving agent, after description of each site | part of the excretion opening | mouth opposing part 11, the excretion liquid spreading | diffusion area | region 12, and the thickness recessed part 8 in the surface sheet 1, a containing part and It is mentioned later with description of the effect | action of a non-containing part.

  The sanitary napkin 10 has an excretion opening facing portion 11 that faces the skin contact surface side, that is, the top sheet 1 by contacting the excretion opening of the wearer.

The excretion opening facing portion 11 is a liquid receiving portion that directly receives the wearer's excretion fluid, and is a portion that allows the excretion fluid to permeate the absorbent body 3. In the surface sheet 1, the excretion opening opposing part 11 processes the most excretion liquid. In the present embodiment, the excretion opening facing portion 11 is located at the center of the crotch C in the width direction. However, the position of the excretion opening facing portion 11 is not limited to the position shown in the present embodiment, and can be changed depending on the length of the article as in the case of the crotch C. In general, it can be set as a part at a certain distance from the front part F.
Specifically, the position of the excretion opening facing portion 11 can be defined as follows. That is, a line drawn in the width direction to a position moved 4.5 cm from the fold portion on the front portion F side to the rear portion R side among the plurality of fold portions in the width direction provided for individual packaging of the sanitary napkin 10. with the center line of the product in the width direction and is centered on the point of intersection, the region of the top sheet 1 which is defined by the positive square 3 cm × 3 cm is the excretory opening facing portion 11. In this embodiment, as shown in FIG. 1, there are two, a first fold E1 near the front portion F and a second fold portion E2 near the rear portion R. Positive square 3 cm × 3 cm of the width-direction center line S2 of the phantom line S1 and the napkin 10 drawn in the width direction at a position 4.5mm moved rearward portion R side from the first fold portion E1 is centered on the point of intersection A region partitioned by is defined as an excretion opening facing portion 11.

  In addition, the sanitary napkin 10 is disposed on the skin contact surface side so as to surround the excretory opening facing portion 11 and extend in the surface direction, and the thickness recesses (leak-proof grooves) of the topsheet 1 and the absorbent body 3. 8 has. The arrangement in the surface direction of the thickness recess 8 may be continuous or discontinuous.

The thickness concave portion 8 is a portion formed by squeezing from the skin contact surface side of the topsheet 1 into the absorbent body 3 by embossing or the like in the thickness direction of the sanitary napkin 10. By the pressing, both the surface sheet 1 and the absorbent body 3 located in the thickness recess 8 are in a state of being depressed and integrated from the skin contact surface side to the non-skin contact surface side. Therefore, the surface sheet 1 and the absorbent body 3 of the concave wall portion and the concave bottom portion (not shown) in the thickness concave portion 8 have a higher fiber density than other portions, and have a strong pulling force for excretory fluid. Thus, the thickness recessed part 8 is a part by which the surface sheet 1 and the absorber 3 were squeezed integrally, and the surface sheet 1 only or the part by which only the absorber 3 was squeezed is not included.
The thickness concave portion 8 has a function of protecting the liquid from leaking from the outer periphery of the napkin 10 when the excretion liquid diffuses in the surface direction from the excretion opening facing portion 11. That is, the depression from the skin contact surface side to the non-skin contact surface side blocks the diffusion path in the surface direction of the excretory liquid, and draws the excretion liquid into the absorbent body 3 in the thickness direction with a high fiber density. Enhance locally to prevent liquid diffusion. The thickness concave portion 8 can be the last fort to prevent liquid leakage in the topsheet 1.

  The thickness recesses 8 are linearly arranged in the surface direction of the napkin 10 with a predetermined width in a state of being depressed in the thickness direction as described above. The thickness recessed part 8 of this embodiment has an annular plane shape by continuous arrangement. More specifically, it is an annular shape that surrounds the excretory opening facing portion 11 of the crotch part C, extends to the front portion F and the rear portion R side from the excretion opening facing portion 11, and is connected to the end portion. The ring has an inward constriction at two points in the extending length from the crotch part C toward the front part F and the rear part R (four places in total on the left and right sides). In addition, the planar shape of the thickness recessed part 8 is not limited to the shape of this embodiment, A various shape can be taken if it has the function which can surround the excretion opening | mouth opposing part 11 and can prevent liquid diffusion.

The thickness concave portion 8 is not limited to being continuously arranged in the plane direction as a planar shape, but may be an aggregate of lines arranged discontinuously. For example, it may be discontinuous having one or two or more spaced portions in the middle of the linear portion of the continuous annular thickness recess 8 shown in FIG. 1 (not shown). The linear portions of the thickness recesses 8 which are discontinuous may be partially arranged in parallel in the width direction to enhance the liquid diffusion protection in the width direction. Furthermore, a linear portion of another thickness recess may be added in the width direction or the vertical direction to enhance the liquid diffusion protection in the vertical direction and the width direction. For example, in the specific example of FIG. 2, the thickness recesses 81 and 82 and the thickness recesses 82 and 83 are partially arranged in parallel in the width direction. Moreover, in the specific example of FIG. 2, the thickness recessed part 84 is additionally arrange | positioned in the area | region enclosed by the said thickness recessed parts 81-83.
In addition, the above-described linear portion may be a linear array of, for example, dot-shaped thickness concave portions that are separated into a plurality of portions (not shown). Furthermore, the thickness recessed part 8 may consist of multiple types with different depths, and the multiple types may be arranged alternately to form the linear portion (not shown).

  In the region surrounded by the line of the thickness recessed portion 8, the excretory fluid diffusion region 12 is disposed outside the excretory opening facing portion 11.

  As described above, the excretory fluid diffusion region 12 is a region of the topsheet 1 between the thickness recessed portion 8 and the excretion opening facing portion 11. In addition, when the thickness recessed part 8 consists of a several discontinuous linear part, the excretory fluid diffusion area | region 12 is demarcated as follows. That is, the excretory fluid diffusion region 12 is defined as a region between the contour line connecting the outermost linear portions in the width direction of the linear portions spaced apart by the thickness concave portion 8 and the excretory opening facing portion 11. The For example, in the specific example shown in FIG. 2, the outline 88 is defined by connecting the outermost linear portions in the width direction of the thickness recesses 81, 82, and 83 in the longitudinal direction. A region between the outline 88 and the excretion opening facing portion 11 becomes the excretion fluid diffusion region 12.

  The excretory fluid diffusion region 12 is a region where the excretion fluid received by the excretion opening facing portion 11 is diffused in the surface direction, and at the same time, the excretion fluid is transmitted to the absorber 3. The excretory fluid diffusion region 12 can reduce the amount of excretory fluid reaching the thickness concave portion 8 by permeating into the absorber 3 in the excretion fluid diffusion process. Thereby, the liquid leak prevention property of the napkin 10 can be improved more.

As described above, the topsheet 1 has the liquid film cleaving agent containing part 6 and the non-containing part 7. The topsheet 1 has the containing part 6 in the excretory opening facing part 11.
Thereby, the excretion opening | mouth opposing part 11 can raise liquid permeability by the effect | action mentioned later of a liquid film cleaving agent as a liquid receiving part which processes most excretion liquids. The excretory opening facing portion 11 may be a region composed of only the containing portion 6 or may be a region 18 in which the containing portion 6 and the non-containing portion 7 are mixedly arranged. On the other hand, the excretion liquid diffusion region 12 and the thickness recessed portion 8 have a lower area ratio of the containing portion 6 than the excretion opening facing portion 11 and a large number of non-containing portions 7 from the viewpoint of the liquid flow preventing property described later. Preferably, it is more preferable that the thickness recessed portion 8 is not provided with the containing portion 6 but only the non-containing portion 7. That is, the area of the containing portion 6 so that the excretion opening facing portion 11 is an area where the liquid permeation function is enhanced, and the excretion liquid diffusion area 12 and the thickness recess 8 are the areas where the liquid flow suppression function is enhanced. It is preferable to set the rate in each region. A preferable range of the area ratio of the containing part 6 will be described later together with an explanation of the action of the containing part 6 and the non-containing part 7.

  It is preferable that the excretory opening facing part 11 is a part in which a lot of liquid film cleaving agent containing parts 6 are arranged as a part having the largest amount of excretory liquid as a liquid receiving part and the liquid permeation function is enhanced. At this time, it is preferable to set the area ratio of the containing portion 6 that can sufficiently exhibit the liquid film cleaving action in consideration of the expansibility (macro expansibility) of the liquid film cleaving agent described later on the liquid film. Specifically, the area ratio of the containing part 6 in the excretory opening facing part 11 ({the area of the containing part / the sum of the areas of the containing part and the non-containing part} × 100) is the liquid film as the excretion opening facing part 11 as a whole. From the viewpoint of maintaining the action of the cleaving agent and, as a result, maintaining liquid permeability, it is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more. In particular, when the area ratio of the containing part 6 is 50% or more, the liquid film cleaving action is sufficiently exhibited and the remaining liquid amount is minimized. Moreover, the upper limit of the area ratio of the containing part 6 in the excretion opening facing part 11 is not particularly limited and may be 100%. However, from the viewpoint of liquid flow suppression, that is, before the excretion liquid permeates sufficiently in the thickness direction. From the viewpoint of preventing liquid from flowing into the excretory fluid diffusion region 12, it is preferably less than 100%, more preferably 95% or less, and still more preferably 90% or less. Thereby, in the excretion opening | mouth opposing part 11, the liquid flow suppression effect | action works to some extent, and it can ensure the time allowance for excretion liquid to enter between the fibers of the surface sheet 1, and to permeate | transmit. In addition, the area ratio of the containing portion 6 in the excretory opening facing portion 11 may be 50% or more and 100% or less, but is preferably 50% or more and less than 100%, and preferably 60% or more from the viewpoint of coexistence of liquid permeability and liquid flow suppression. 95% or less is more preferable, and 70% or more and 90% or less is still more preferable.

  On the other hand, the excretory fluid diffusion region 12 is a region where the excretion fluid diffuses from the excretion opening facing portion 11 at a constant speed. Therefore, it is preferable that the excretion liquid diffusion region 12 has a higher liquid flow suppression function than the excretion opening facing portion 11. From this viewpoint, it is preferable that the area ratio of the containing part 6 in the excretory fluid diffusion region 12 is lower than the area ratio of the containing part 6 in the excretory opening facing part 11. Specifically, the area ratio of the containing portion 6 in the excretory fluid diffusion region 12 is preferably 50% or less, more preferably 40% or less, and still more preferably 30% or less. Further, in the excretory fluid diffusion region 12, it is possible to reduce the amount of effluent as much as possible by allowing the excreted fluid that has flown to permeate the absorbent body 3 before the thickness concave portion 8, from the viewpoint of improving the leakproof property of the napkin 10. preferable. Therefore, the area ratio of the containing portion 6 in the excretory fluid diffusion region 12 is 5 from the viewpoint of having a permeability that can sufficiently cope with the action of the liquid film cleaving agent in consideration of the amount of the excretory fluid to diffuse. % Or more, preferably 10% or more, and more preferably 20% or more. Further, from the viewpoint of coexistence of a liquid film cleaving action suitable for the amount of liquid in the excretory fluid diffusion region 12 and liquid flow suppression, the area ratio of the containing portion 6 in the excretion fluid diffusion region 12 is preferably 5% or more and 50% or less. 10% to 40% is more preferable, and 20% to 30% is more preferable.

  In addition, as described above, the thickness recessed portion 8 is a portion in which the surface sheet 1 and the absorbent body 3 have a higher fiber density than the other portions, so that the capillary force acts strongly and has a high liquid drawing force. Moreover, since the surface sheet 1 and the absorber 3 in the thickness recessed part 8 are integrated in a compacted state, the excretory fluid is easily absorbed directly into the absorber 3. Therefore, in the thickness recessed part 8, even if the area ratio of the containing part 6 is made smaller than the excretion liquid diffusion region 12 and the excretion opening facing part 11, the liquid can be sufficiently drawn. Since the excretory fluid diffusion region 12 is narrower in the width direction than the longitudinal direction, when the amount of excretion fluid is large, it flows out of the excretion fluid diffusion region 12 and easily reaches the thickness recess. Therefore, it is preferable that the thickness recessed part 8 is a part which strengthened the function which interrupt | blocks diffusion of the original excretion liquid from a viewpoint of the liquid leak prevention property especially in the width direction. That is, the smaller the area ratio of the containing part 6 in the thickness recessed part 8, the more preferable, 40% or less is more preferable, 20% or less is further more preferable, and 0% (that is, only the non-containing part 7) is particularly preferable.

Further, in the excretory fluid diffusion region 12, it is preferable that a part of the non-containing portion 7 is disposed adjacent to the thickness recessed portion 8. That is, a part of the non-contained portion 7 of the excretory fluid diffusion region 12 is arranged so as to be connected to the inner edge (exhaust fluid diffusion region 12 side) of the linear portion extending in the surface direction of the thickness recess 8. Is preferred. Furthermore, it is preferable that a part of the non-containing part 7 of the excretory liquid diffusion region 12 is arranged so as to border the entire linear part in the surface direction of the thickness recessed part 8 in the adjacent state. Thereby, the flow rate of the excretion liquid further diffusing into the thickness concave portion 8 in the excretion fluid diffusion region 12 is largely suppressed, and the liquid flow blocking function of the thickness concave portion 8 is enhanced.
For example, the aspect which the partial enlarged plan view of FIG. 3 shows is mentioned. In the aspect shown in FIG. 3, in the excretory fluid diffusion area | region 12, the non-containing part 71 is distribute | arranged adjacent to the inner side of the thickness recessed part 8, and is preferable from a viewpoint of liquid flow suppression as mentioned above. Furthermore, although not shown, it is preferable that the non-containing part 71 is disposed adjacently so as to border the entire circumference of the annular planar shape of the thickness recessed part 8.
In FIG. 3, both the excretory opening facing part 11 and the excretion liquid diffusion area 12 are an area 18 in which the liquid film cleaving agent containing part 6 and the non-containing part 7 are mixedly arranged, and the excretion opening facing part 11 is excreted. The area ratio of the containing portion 6 is set higher than that of the liquid diffusion region 12. In the excretion opening opposing part 11, the circular (dot-shaped) containing parts 6 are spaced apart from each other and arranged in a plurality of directions, and the non-containing part 7 is formed therebetween. In the excretory fluid diffusion area | region 12, the linear containing part 6 is distribute | arranged to the grid | lattice form, and the rhombus non-containing part 7 is regularly arranged between them. However, the aspect of FIG. 3 is an example, and the planar shape of the containing part 7 and the non-containing part 7, the mixed arrangement pattern, and the area ratio of the containing part 6 are not limited to this and can be variously adopted. From the viewpoint of liquid flow prevention, it is more preferable that the non-containing part 7 is adjacent to the plurality of containing parts 6 and is arranged continuously or intermittently so as to separate the containing parts 6 from each other. . The continuous arrangement | sequence of the non-containing part 7 said here is an arrangement | sequence with which the non-containing part 7 extends without a cut | interruption in the surface of the surface sheet 1. FIG. Moreover, said intermittent arrangement | positioning of the non-containing part 7 is that the some non-containing part 7 isolate | separated mutually is arranged spaced apart.

Next, when any one or both of the excretion opening facing portion 11 and the excretion liquid diffusion region 12 of the topsheet 1 are the region 18 in which the containing portion 6 and the non-containing portion 7 are mixed and arranged, in the region 18 The action on the excretory fluid will be described.
For example, in the region 18 where the containing part 6 and the non-containing part 7 are mixed and disposed, such as the excretory opening facing part 11 and the excretory liquid diffusion area 12 shown in FIG. In the process in which the liquid droplets flowing through the wearer's body first contact with the nonwoven fabric or in the process of flowing on the surface of the nonwoven fabric after contacting the nonwoven fabric, one droplet includes the containing portion 6 containing the liquid film cleaving agent, It overlaps over both the non-containing part 7 which does not contain a film cleaving agent. In such an overlap, the liquid film cleaving action in the containing part 6 and the liquid flow suppressing action by the non-containing part are simultaneously expressed for the droplet.
The surface flow preventing property of the liquid described above is that the non-containing part 7 that does not contain the liquid film cleaving agent is arranged continuously or intermittently in a plurality of directions, thereby suppressing the occurrence of liquid flow on the nonwoven fabric surface, And even if a liquid flow arises, it is because the liquid flow prevention effect | action which prevents advancing of a droplet flow works by the non-containing part 7 arrange | positioned in several directions.

  At the same time, a liquid film cleaving agent such as between the fibers of the topsheet 1 is obtained by overlapping the droplets over both the containing part 6 containing the liquid film cleaving agent and the non-containing part 7 not containing the liquid film cleaving agent. The liquid film is cleaved by this action, and the permeability of the liquid in the thickness direction of the surface sheet is increased. In that case, since a liquid film cleaving agent is provided with the expansibility with respect to a liquid as it mentions later, in the area | region 18 with which the containing part 6 and the non-containing part 7 were mixedly arranged, it straddled the containing part 6 and the non-containing part 7 The liquid film cleaving agent of the containing part 6 expands to the non-containing part 7 with respect to the droplets that are present and whose liquid flow is suppressed. That is, the liquid film cleaving agent is not only expanded on a liquid film in a narrow region such as between fibers in the containing part 6 described later (micro-expansion), but also from the containing part 6 that overlaps the liquid droplet to the non-containing part 7. A wider extension of (Macro extension). Thereby, the liquid film cleaving action as described later of the liquid film cleaving agent is expressed not only in the containing part 6 but also in the non-containing part 7. That is, the expandability of the liquid film cleaving agent itself compensates for the reduction of the liquid film cleaving action due to the liquid film cleaving agent being limited to the containing part 6, and the containing part 6 and the non-containing part 7 are mixedly arranged. This means that the liquid film cleaving action of the entire region 18 is maintained. Further, the effect of the expansion of the liquid film cleaving agent to the non-containing part 7 is further enhanced by the fact that the liquid droplets remain in a certain region due to the liquid flow preventing action.

  Thus, in the surface sheet 1, in the area | region 18 where the containing part 6 and the non-containing part 7 were mixed and arrange | positioned, the surface flow preventive property of a liquid can be improved, expressing a high liquid remaining reduction effect | action. The above-described liquid flow preventing action is particularly effective in that the liquid permeation path that allows the liquid to permeate in the thickness direction is opened when the liquid first touches the top sheet 1. That is, at the initial stage where the surface of the nonwoven fabric is not familiar with the liquid, the liquid flow is difficult to enter between the fibers due to the hydrophobicity of the fiber surface due to the liquid film cleaving agent, and the liquid flow prevention action described above, Gives the liquid droplets time to enter between the fibers. On the other hand, once the liquid has permeated through the nonwoven fabric and the liquid permeation passage is secured, the liquid easily enters between the fibers, and the liquid film cleaving action by the liquid film cleaving agent is more strongly exhibited.

  Macro expansion of the liquid film cleaving agent from the containing part 6 to the non-containing part 7 tends to occur depending on the case where the droplet is menstrual blood or the like. Therefore, the reduction of the liquid residue due to the macro expandability is particularly effectively exhibited in the region 18 where the containing portion 6 and the non-containing portion 7 in the topsheet 1 of the sanitary napkin 10 are mixedly arranged.

The degree of macro expansibility of the liquid film cleaving agent from the containing part 6 to the non-containing part 7 depends on various factors. For example, the larger the expansion coefficient described later, the longer the expansion distance in the droplet, and the higher the expandability. Moreover, the expansion distance in a droplet becomes long and the high expansibility is shown, so that the containing basis weight of the liquid film cleaving agent in the containing part 6 is large.
Similarly, the liquid film cleaving agent exhibits a suitable high expansibility for droplets by moderately suppressing the viscosity. Specifically, the viscosity of the liquid film cleaving agent is 0 cps or more, preferably 10,000 cps or less, more preferably 1000 cps or less, and further preferably 200 cps or less. The unit of viscosity cps is converted by 1 cps = 1 × 10 ⁻³ Pa · s.

(Measurement method of viscosity of liquid film cleaving agent)
The viscosity of the liquid film cleaving agent can be measured by the following method.
First, 40 g of a liquid film cleaving agent is prepared. Next, the viscosity of the liquid film cleaving agent is measured using a tuning fork-type vibration viscometer SV-10 (manufactured by A & D Co., Ltd.) in an environmental region having a temperature of 25 ° C. and a relative humidity (RH) of 65%. This is repeated three times, and the average value is adopted as the viscosity. When the liquid film cleaving agent is solid, the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid, and the measurement is carried out while maintaining the temperature condition.
In addition, when measuring about the liquid film cleaving agent adhering to a fiber, a liquid film cleaving agent is taken out from a fiber by the method used in measurement of the expansion coefficient etc. which are mentioned later. In this case, when only a small amount can be taken out for the measurement, identification is performed in the same manner as in the case of measuring an expansion coefficient, which will be described later.

  In the region 18 where the containing part 6 and the non-containing part 7 are mixed and arranged in either or both of the excretory opening facing part 11 and the excretory liquid diffusion area 12, the balance between the liquid film cleaving action and the liquid flow suppressing action is It is determined by the area ratio of the containing part 6. As long as both actions are exhibited, the containing part 6 and the non-containing part 7 can be mixed and arranged in various patterns without being limited to the pattern of FIG. 3, and the planar shapes of the containing part 6 and the non-containing part 7 are also It can take a variety of shapes.

Examples of the planar shape of the containing part 6 and the non-containing part 7 include, in addition to the circular shape described above, a shape of various figures such as a rectangle, a broken line having a predetermined width, a wavy line, and a curved line. It is done. Moreover, you may make it the whole become a geometric pattern etc. by the arrangement | sequence of the containing part 6 or the non-containing part 7. FIG.
For example, as shown in FIG. 4A, in the region 18 where the liquid film cleaving agent-containing part 6 and the non-containing part 7 are mixed and arranged on the surface sheet 1, the lattice-like non-containing part 7 is formed on the nonwoven fabric surface. There is a pattern in which a plurality of inclusions 6 shaped like diamonds are arranged apart from each other. Further, as shown in FIG. 4B, a pattern in which a plurality of non-containing parts 7 shaped like rhombuses are arranged in the lattice-shaped containing part 6 in the mixed arrangement region 18 is arranged apart from each other. In addition, for example, the containing parts 6 may be arranged in a wavy line so as to be spaced apart from each other, and the non-containing part 7 may be provided between the containing parts 6. Moreover, the containing part 6 may be arranged as a plurality of elliptical shapes having different sizes, arranged concentrically and spaced apart from each other, and the non-containing part 7 may be provided between the containing parts 6. The arrangement | sequence which replaced the containing part 6 and the non-containing part 7 in these forms may be sufficient. Further, the containing part 6 may be made of a plurality of lines having a geometric shape, the space between the containing parts 6 may be a non-containing part, and the non-containing part 7 may be made of a plurality of lines having a geometric shape, Between 7 may be the containing portion 6.

Moreover, as long as there exists said 2 effect | action, the arrangement | positioning part 6 and the non-containing part 7 of the surface sheet 1 are mixing arrangement arrangement | positioning like the present embodiment in the direction where the containing part 6 and the non-containing part 7 are arranged. A plurality of directions on the surface of the region 18 (the excretion opening facing portion 11 and / or the excretion fluid diffusion region 12) may be provided, or one direction may be provided. However, since the liquid droplets can flow out in various directions on the surface, the arrangement in a plurality of intersecting directions is preferable. In addition, it is more preferable that the arrangement direction includes at least the longitudinal direction and the width direction from the viewpoint of enhancing the liquid leakage prevention (leakproof property) of the sanitary napkin 10.
Specific examples shown in FIGS. 5 (A) and 5 (B) are examples of forms in which the arrangement direction is composed of only one direction. In the form shown in FIG. 5 (A), both the containing part 6 and the non-containing part 7 extend in a strip shape in the vertical direction, and the strip-like containing part 6 and the non-containing part 7 are alternately arranged in the width direction. . In the form shown in FIG. 5B, the bands of the containing part 6 and the non-containing part 7 extending in the width direction are alternately arranged in the vertical direction.

  From the viewpoint of improving the leak-proof property of the sanitary napkin 10, it is preferable to have an arrangement in which the liquid flow in the width direction is suppressed. For example, as shown in FIG. 5 (A), the arrangement in which the bands of the containing part 6 and the non-containing part 7 are extended in the vertical direction is the same as that of the containing part 6 and the non-containing part 7 as shown in FIG. This is more preferable than the arrangement in which the bands are extended in the width direction. Moreover, in the arrangement | sequence of the circular containing part 6 like the excretion opening opposing part 11 shown in FIG. 3, it is preferable to have an arrangement | sequence of a vertical direction at least and a width direction.

Further, from the viewpoint of leak-proof property of the sanitary napkin 10, the region 18 (the excretory opening facing portion 11 and / or the excretory fluid diffusion region 12) of the topsheet 1 in which the containing portion 6 and the non-containing portion 7 are mixed and arranged. ), When a virtual line along the width direction is arbitrarily drawn, the length of the containing part 6 on the virtual line is preferably shorter than the length of the non-containing part 7. At this time, when there are a plurality of containing parts 6 and non-containing parts 7 that overlap on the virtual line, the lengths of the adjacent containing parts 6 and non-containing parts 7 are compared. Moreover, it is preferable that a virtual line is drawn in the position where the length of the non-containing part 7 becomes the longest.
Specific examples of this preferable form include the forms shown in FIGS.
FIG. 6A is a partially enlarged view of the arrangement of FIG. When the imaginary line T along the width direction is drawn so as to cross the row of the circular containing parts 6 arranged in the width direction, the length S1 of the non-containing part 7 in the width direction is the length of the containing part 6 in the width direction. It is preferably longer than S2 (S1> S2). Accordingly, it is preferable that the region in the width direction of the liquid film cleaving agent containing portion 6 that can be a factor of the liquid flow is moderately suppressed, and the liquid flow can be prevented from being stably generated. In addition, the length of the width direction of the containing part 6 here is a diameter of a circle. The length in the width direction of the non-containing portion 7 is a length obtained by subtracting the diameter of the circle from the pitch between the circular containing portions 6 on the virtual line T.
FIG. 6B shows a form in which the containing portion 6 has an elliptical shape. In this embodiment, when the virtual line T along the width direction is drawn so as to cross the row of the elliptical containing parts 6 arranged in the width direction, the length S1 of the non-containing part 7 in the width direction is It is preferably longer than the length S2 in the width direction (S1> S2). In this embodiment, the imaginary line T is drawn so as to pass through the center of the ellipse of the containing part 6, and the length in the width direction of the containing part 6 is the width passing through the center of the ellipse on the imaginary line T. The diameter of the direction. The length in the width direction of the non-containing part 7 is a length obtained by subtracting the diameter of the circle from the pitch between the elliptical containing parts 6 on the virtual line T.
FIG. 6C is a partially enlarged view of the arrangement in which the band-shaped containing part 6 and the non-containing part 7 shown in FIG. 5A are extended in the longitudinal direction. In this case, a virtual line T along the width direction is drawn at an arbitrary position in the longitudinal direction. On the imaginary line T, it is preferable that the length (band length) S1 of the non-containing portion 7 is longer than the length (band length) S2 of the containing portion 6 (S1> S2).
FIG. 6 (D) is a partially enlarged view of the lattice-shaped arrangement shown in FIG. 4 (B) in which a plurality of non-contained portions 7 shaped like rhombuses are arranged apart from each other in the lattice-shaped inclusion portions 6. FIG. Here, the imaginary line T is drawn so as to pass through the intersection of the containing parts 6. That is, the imaginary line T is drawn at a position where the length in the width direction of the non-containing part 7 is the longest. On the imaginary line T, it is preferable that the length (band length) S1 of the non-containing portion 7 is longer than the length (band length) S2 of the containing portion 6 (S1> S2).

  That is, the ratio (S2 / S1) of the length (S2) of the containing portion 6 on the imaginary line to the length (S1) of the non-containing portion 7 is preferably 1/1 or less from the viewpoint of liquid flow prevention properties. 2/3 or less is more preferable, and 3/7 or less is still more preferable. Further, the ratio (S2 / S1) of the length (S2) of the containing part 6 on the imaginary line to the length (S1) of the non-containing part 7 is the ratio in the non-containing part 7 due to macro expansion of the liquid film cleaving agent. From the viewpoint of reducing the remaining liquid, 1/19 or more is preferable, 1/9 or more is more preferable, and 1/4 or more is still more preferable.

  The difference between the contact angle of the constituent fibers of the containing part 6 and the contact angle of the constituent fibers of the non-containing part 7 is less likely to form a liquid film when the contact angle of the constituent fibers of the containing part 6 is higher than that of the non-containing part 7. Therefore, from the viewpoint of liquid film formation inhibition, 5 degrees or more is preferable, 10 degrees or more is more preferable, and 20 degrees or more is more preferable. Further, the difference in the contact angle is preferably 60 degrees or less, more preferably 50 degrees or less, and further preferably 40 degrees or less, from the viewpoint of easy maintenance of the generated waveform. In addition, said contact angle can be measured by the method mentioned later.

The contact angle of the constituent fibers of the non-containing part 7 is preferably 90 degrees or less, more preferably 80 degrees or less, and still more preferably 70 degrees or less. Thereby, the wettability of the fiber surface is moderately imparted, the liquid easily enters between the fibers, the liquid flow is easily suppressed, the wetted area is increased, and the liquid film cleaving agent is easily transferred to the liquid film.
Further, the contact angle of the constituent fibers of the containing portion 6 is preferably 110 degrees or less, more preferably 90 degrees or less, and still more preferably 80 degrees or less. Thereby, the slipperiness | hydrophobicity of the containing part 6 or hydrophobicity becomes weak, and it becomes difficult to produce the surface outflow of the liquid in the nonwoven fabric surface.

The above contact angle can be measured by the following method.
That is, a fiber is taken out from a predetermined portion of the nonwoven fabric constituting the surface sheet 1, and the contact angle of water with the fiber is measured. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Deionized water is used to measure the contact angle. The measurement is performed at a temperature of 25 degrees and a relative humidity (RH) of 65%. The amount of liquid discharged from an ink jet type water droplet discharge part (manufactured by Cluster Technology Co., Ltd., pulse injector CTC-25 having a discharge part pore diameter of 25 μm) is set to 20 picoliters, and a water drop is dropped directly above the fiber. The state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera. The recording device is preferably a personal computer incorporating a high-speed capture device from the viewpoint of image analysis or image analysis later. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image of water drops on the fiber taken out from the non-woven fabric is attached to the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is θ / 2 method) The image processing algorithm is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected). And the contact angle. The fiber taken out from the nonwoven fabric is cut into a fiber length of 1 mm, and the fiber is placed on a sample table of a contact angle meter and kept horizontal. Two different contact angles are measured for each fiber. N = 5 contact angles are measured to one decimal place, and a value obtained by averaging a total of 10 measured values (rounded to the second decimal place) is defined as the contact angle.

  Next, the preferable embodiment of the liquid film cleaving agent contained in the nonwoven fabric which comprises the surface sheet 1 of the sanitary napkin 10 is demonstrated.

  The liquid film cleaving agent of the first embodiment has an expansion coefficient of 15 mN / m or more and a water solubility of 0 g or more and 0.025 g or less for a liquid having a surface tension of 50 mN / m. In addition, the compound which has the property of the liquid film cleaving agent of 1st Embodiment may be called compound C1.

The “expansion coefficient with respect to a liquid having a surface tension of 50 mN / m” possessed by the liquid film cleaving agent refers to an expansion coefficient with respect to a liquid assuming the above-mentioned excretion liquid such as menstrual blood or urine. The “expansion coefficient” is a value obtained from a measurement value obtained by a measurement method described later in an environment region at a temperature of 25 ° C. and a relative humidity (RH) of 65% based on the following formula (1). In addition, the liquid film in Formula (1) means a liquid phase of “a liquid having a surface tension of 50 mN / m”, and is a liquid in a state where a film is stretched between fibers or on a fiber surface, Includes both, also simply called liquid. Further, the surface tension in the formula (1) means an interfacial tension at the interface between the liquid film and the liquid film cleaving agent with the gas phase. To do. This distinction applies to other descriptions in the present specification.
_{S = γ w -γ o -γ wo} ····· (1)
γ _w : surface tension of liquid film (liquid)
γ _o : surface tension of liquid film cleaving agent
γ _wo : Interfacial tension of liquid film cleaving agent with liquid film

As can be seen from Equation (1), the expansion coefficient (S) of the liquid film cleaving agent increases as the surface tension (γ _o ) of the liquid film cleaving agent decreases, and the interfacial tension of the liquid film cleaving agent with the liquid film It increases as (γ _wo ) decreases. When the expansion coefficient is 15 mN / m or more, the liquid film cleaving agent has high mobility on the surface of the liquid film generated in a narrow region between fibers, that is, high diffusibility. In addition, as the extensibility on a liquid film in a narrow region such as between fibers (micro extensibility) is higher, the wider extensibility from the containing part 6 that overlaps the droplet to the non-containing part 7 (macro extensibility). Is also expensive. From the viewpoint of sufficiently exhibiting the macro and micro expansibility described above, the expansion coefficient of the liquid film cleaving agent is more preferably 20 mN / m or more, further preferably 25 mN / m or more, and particularly preferably 30 mN / m or more. On the other hand, the upper limit is not particularly limited, but when a liquid having a surface tension of 50 mN / m is used according to Equation (1), a liquid having an upper limit of 50 mN / m and a surface tension of 60 mN / m was used. In this case, when a liquid having an upper limit of 60 mN / m and a surface tension of 70 mN / m is used, the surface tension of the liquid forming the liquid film becomes an upper limit, such as 70 mN / m. Therefore, in the present invention, from the viewpoint of using a liquid having a surface tension of 50 mN / m, it is 50 mN / m or less.

The “water solubility” of the liquid film cleaving agent is a dissolvable mass (g) of the liquid film cleaving agent with respect to 100 g of deionized water. Based on the measurement method described later, the temperature is 25 ° C. and the relative humidity (RH) is 65 % Is a value measured in the environmental region. When the water solubility is 0 g or more and 0.025 g or less, the liquid film cleaving agent is difficult to dissolve and forms an interface with the liquid film, thereby making the diffusibility more effective. From the same viewpoint, the water solubility of the liquid film cleaving agent is preferably 0.0025 g or less, more preferably 0.0017 g or less, and still more preferably less than 0.0001 g. The water solubility is preferably as small as possible, and is 0 g or more. From the viewpoint of diffusibility into the liquid film, it is practical to set the water solubility to 1.0 × 10 ⁻⁹ g or more. In addition, it is thought that said water solubility is applicable also to the menstrual blood, urine, etc. which have a water | moisture content as a main component.

The surface tension (γ _w ) of the liquid film (liquid having a surface tension of 50 mN / m), the surface tension of the liquid film cleaving agent (γ _o ), and the interfacial tension of the liquid film cleaving agent (γ _wo ) The water solubility of the liquid film cleaving agent is measured by the following method.
In addition, when the surface sheet 1 to be measured is in a state of being incorporated in the sanitary napkin 10, it is taken out and measured as follows. That is, in the sanitary napkin 10, after the adhesive used for joining the member to be measured and other members is weakened by a cooling means such as cold spray, the member to be measured is carefully peeled off and taken out. This extraction method is applied in the measurement according to the nonwoven fabric of the present invention, such as measurement of the interfiber distance and the fineness described later.
When measuring the liquid film cleaving agent adhering to the fiber, first, the fiber adhering the liquid film cleaving agent is washed with a washing liquid such as hexane, methanol, ethanol, and the solvent used for the washing (including the liquid film cleaving agent). The washing solvent is dried and removed. The mass of the substance taken out at this time is applied when calculating the content ratio (OPU) with respect to the fiber mass of the liquid film cleaving agent. If the amount of the extracted material is too small to measure the surface tension or interfacial tension, select an appropriate column and solvent according to the composition of the extracted material, and then fractionate each component by high performance liquid chromatography. Furthermore, the structure of each fraction is identified by performing MS measurement, NMR measurement, elemental analysis and the like for each fraction. When the liquid film cleaving agent contains a polymer compound, it becomes easier to identify the constituents by using a technique such as gel permeation chromatography (GPC) together. If the substance is a commercial product, it is procured, and if it is not a commercial product, a sufficient amount is obtained by synthesis, and the surface tension and interfacial tension are measured. In particular, regarding the measurement of the surface tension and interfacial tension, when the liquid film cleaving agent obtained as described above is a solid, the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid. Perform measurement under the same conditions.

(Measurement method of surface tension (γ _w ) of liquid film (liquid))
Measurement can be performed using a platinum plate by the plate method (Wilhelmy method) in an environmental region at a temperature of 25 ° C. and a relative humidity (RH) of 65%. As a measuring device at that time, an automatic surface tension meter “CBVP-Z” (trade name, manufactured by Kyowa Interface Science Co., Ltd.) can be used. A platinum plate having a purity of 99.9%, a size of 25 mm in width and 10 mm in length is used.
In the following measurement relating to the liquid film cleaving agent, the above-mentioned “liquid having a surface tension of 50 mN / m” is a polyoxyethylene sorbitan monolaur, which is a nonionic surfactant, in deionized water using the above measurement method. A solution adjusted to a surface tension of 50 ± 1 mN / m by using a rate (for example, trade name Leool Super TW-L120 manufactured by Kao Corporation) is used.

(Measurement method of surface tension (γ _o ) of liquid film cleaving agent)
Similar to the measurement of the surface tension (γ _w ) of the liquid film, it can be measured using the same apparatus by the plate method in an environmental region at a temperature of 25 ° C. and a relative humidity (RH) of 65%. In this measurement, as described above, when the obtained liquid film cleaving agent is solid, the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid, and the measurement is performed with the temperature condition.

(Measurement method of interfacial tension (γ _wo ) of liquid film cleaving agent with liquid film)
It can be measured by the pendant drop method in an environmental region where the temperature is 25 ° C. and the relative humidity (RH) is 65%. As the measuring device at that time, an automatic interface viscoelasticity measuring device (manufactured by TECRIS-ITCONCEPT, trade name THE TRACKER, KRUSS, trade name DSA25S) can be used. In the pendant drop method, when a drop is formed, adsorption of a nonionic surfactant contained in a liquid having a surface tension of 50 mN / m starts, and the interfacial tension decreases with time. Therefore, the interfacial tension when the drop is formed (at 0 second) is read. In this measurement, as described above, when the obtained liquid film cleaving agent is solid, the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid, and the measurement is performed with the temperature condition. .
When measuring the interfacial tension, if the density difference between the liquid film cleaving agent and the liquid with a surface tension of 50 mN / m is very small, the viscosity is extremely high, or the interfacial tension value is below the pendant drop measurement limit, The interfacial tension measurement by the pendant drop method may be difficult. In that case, the measurement can be performed by measuring by a spinning drop method in an environment region at a temperature of 25 ° C. and a relative humidity (RH) of 65%. As a measuring device at that time, a spinning drop interfacial tensiometer (manufactured by KRUSS, trade name SITE100) can be used. Also for this measurement, the interfacial tension when the drop shape is stabilized is read, and when the obtained liquid film cleaving agent is solid, it is heated to the melting point of the liquid film cleaving agent + 5 ° C. The phase is changed and the measurement is carried out with the temperature condition.
Note that if the interfacial tension can be measured by both measuring devices, a smaller interfacial tension value is adopted as the measurement result.

(Measurement method of water solubility of liquid film cleaving agent)
While stirring 100 g of deionized water with a stirrer in an environmental region at a temperature of 25 ° C. and a relative humidity (RH) of 65%, the obtained liquid film cleaving agent was gradually dissolved and became insoluble (floating, precipitated, The amount of dissolution at the time when precipitation and cloudiness were observed is defined as water solubility. Specifically, it is measured by adding an agent every 0.0001 g. As a result, it is assumed that 0.0001 g is not dissolved, “less than 0.0001 g”, 0.0001 g is dissolved, and 0.0002 g is not dissolved, “0.0001 g”. When the liquid film cleaving agent is a surfactant, “dissolution” means both monodisperse dissolution and micelle dispersion dissolution, and the amount of dissolution when floating, precipitation, precipitation, or cloudiness is observed is the water solubility. It becomes.

  The liquid film cleaving agent of the present embodiment has the above expansion coefficient and water solubility, so that it spreads without dissolving on the surface of the liquid film and can displace the liquid film layer from the vicinity of the center of the liquid film. it can. As a result, the liquid film is destabilized and cleaved.

Here, the effect | action in the nonwoven fabric which comprises the surface sheet of the liquid film cleaving agent of this embodiment is demonstrated concretely with reference to FIG.
As shown in FIG. 7, in a narrow region between the fibers of the nonwoven fabric, a highly viscous liquid such as menstrual blood or excretory liquid such as urine tends to stretch the liquid film 2. On the other hand, the liquid film cleaving agent destabilizes and breaks the liquid film in the following manner, inhibits formation, and promotes drainage from the nonwoven fabric. First, as shown in FIGS. 8A1 and 8B1, the liquid film cleaving agent 3 included in the nonwoven fiber 1 moves on the surface of the liquid film 2 while maintaining the interface with the liquid film 2. Next, as shown in FIGS. 8A2 and 8B, the liquid film cleaving agent 3 pushes away a part of the liquid film 2 and penetrates in the thickness direction, as shown in FIGS. 8A3 and 8B3. Thus, the liquid film 2 is gradually changed to a non-uniform and thin film. As a result, as shown in FIGS. 8A4 and 8B4, the liquid film 2 is opened and cleaved so as to be repelled. The cleaved menstrual fluid or the like becomes droplets and easily passes between the fibers of the nonwoven fabric, and the remaining liquid is reduced. Moreover, the effect | action with respect to the liquid film of said liquid film cleaving agent is similarly demonstrated not only to the case with respect to the liquid film between fibers but with respect to the liquid film clinging to the fiber surface. That is, the liquid film cleaving agent can move over the liquid film clinging to the fiber surface and push away a part of the liquid film to cleave the liquid film. In addition, the liquid film cleaving agent can cleave the liquid film by the hydrophobic action without being moved at the position attached to the fiber to inhibit the formation of the liquid film clinging to the fiber surface.

  Thus, the liquid film cleaving agent according to the present invention does not perform liquid modification such as lowering the surface tension of the liquid film, but cleaves and inhibits the liquid film itself generated between the fibers or on the fiber surface. To promote drainage of liquid from the nonwoven fabric. Thereby, the liquid residue of a nonwoven fabric can be reduced. Moreover, when the surface sheet which consists of such a nonwoven fabric is integrated in an absorbent article, the retention of the liquid between fibers is suppressed and the liquid permeation | transmission path to an absorber is ensured. Thereby, the liquid permeability increases, the liquid flow on the sheet surface is suppressed, and the liquid absorption rate increases. In particular, it is possible to increase the absorption rate of a liquid that tends to stay between fibers, such as highly viscous menstrual blood. And the stain | pollution | contamination of redness etc. in a surface sheet is not conspicuous, and it becomes a safe and reliable absorbent article which can actually feel an absorptive power.

In this embodiment, the liquid film cleaving agent preferably further has an interface tension of 20 mN / m or less with respect to a liquid having a surface tension of 50 mN / m. That is, it is preferable that the “interfacial tension (γ _wo ) of the liquid film cleaving agent with respect to the liquid film”, which is one variable for determining the value of the expansion coefficient (S) in the above-described mathematical formula (1), is 20 mN / m or less. By keeping the “interfacial tension of the liquid film cleaving agent (γ _wo ) with the liquid film” low, the expansion coefficient of the liquid film cleaving agent is increased, and the liquid film cleaving agent is likely to move from the fiber surface to the vicinity of the liquid film center. The above-described action becomes clearer. From this viewpoint, the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” of the liquid film cleaving agent is more preferably 17 mN / m or less, further preferably 13 mN / m or less, still more preferably 10 mN / m or less, and 9 mN. / M or less is particularly preferable, and 1 mN / m or less is particularly preferable. On the other hand, the lower limit is not particularly limited, and may be larger than 0 mN / m from the viewpoint of insolubility in the liquid film. Note that when the interfacial tension is 0 mN / m, that is, when dissolved, an interface between the liquid film and the liquid film cleaving agent cannot be formed, so Equation (1) does not hold and the agent does not expand.
As can be seen from the mathematical expression, the expansion coefficient changes depending on the surface tension of the target liquid. For example, when the surface tension of the target liquid is 72 mN / m, the surface tension of the liquid film cleaving agent is 21 mN / m, and the interfacial tension is 0.2 mN / m, the expansion coefficient is 50.8 mN / m.
When the surface tension of the target liquid is 30 mN / m, the surface tension of the liquid film cleaving agent is 21 mN / m, and the interfacial tension is 0.2 mN / m, the expansion coefficient is 8.8 mN / m.
In any case, the larger the expansion coefficient, the greater the liquid film cleavage effect.
In this specification, the numerical value at the surface tension of 50 mN / m is defined. However, even if the surface tension is different, there is no change in the magnitude relationship between the numerical values of the expansion coefficients of the substances. Even if it changes with the physical condition of each day, the agent with a larger expansion coefficient shows an excellent liquid film cleavage effect.

In this embodiment, the surface tension of the liquid film cleaving agent is preferably 32 mN / m or less, more preferably 30 mN / m or less, still more preferably 25 mN / m or less, and particularly preferably 22 mN / m or less. Moreover, the said surface tension is so good that it is small, and the minimum is not specifically limited. From the viewpoint of durability of the liquid film cleaving agent, 1 mN / m or more is practical.
By setting the surface tension of the liquid film cleaving agent to be in the above range or less, even when the surface tension of the target liquid that stretches the liquid film is lowered, the liquid film cleaving action can be effectively exhibited.

Next, the liquid film cleaving agent of the second embodiment will be described.
The liquid film cleaving agent of the second embodiment has an expansion coefficient larger than 0 mN / m for a liquid having a surface tension of 50 mN / m, that is, a positive value, a water solubility of 0 g or more and 0.025 g or less, and a surface tension. The interfacial tension with respect to a liquid of 50 mN / m is 20 mN / m or less. In addition, the compound having the properties of the liquid film cleaving agent of the second embodiment may be referred to as compound C2. The nonwoven fabric of 2nd embodiment contains the said liquid film cleaving agent. When the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” is 20 mN / m or less, it means that the diffusibility of the liquid film cleaving agent on the liquid film is increased as described above. Thereby, even when the expansion coefficient is relatively small such that the “expansion coefficient for a liquid having a surface tension of 50 mN / m” is less than 15 mN / m, many liquid film cleaving agents are removed from the fiber surface due to high diffusibility. By dispersing in the liquid film and pushing the liquid film at many positions, the same effect as in the first embodiment can be achieved.
The “extension coefficient for a liquid having a surface tension of 50 mN / m”, “water solubility” and “interfacial tension for a liquid having a surface tension of 50 mN / m” relating to the liquid film cleaving agent are defined in the first embodiment. The measuring method is also the same.

In this embodiment, from the viewpoint of making the action of the liquid film cleaving agent more effective, the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” is preferably 17 mN / m or less, and 13 mN / m or less. Is more preferably 10 mN / m or less, still more preferably 9 mN / m or less, and particularly preferably 1 mN / m or less. The lower limit is not particularly limited as in the first embodiment, and is practically larger than 0 mN / m from the viewpoint of not dissolving in a liquid film (a liquid having a surface tension of 50 mN / m). .
Further, the “expansion coefficient for a liquid having a surface tension of 50 mN / m” is preferably 9 mN / m or more, more preferably 10 mN / m or more from the viewpoint of making the action of the liquid film cleaving agent more effective. More preferably, it is 15 mN / m or more. Although the upper limit in particular is not restrict | limited, 50 mN / m or less is substantial from a viewpoint from which surface tension of the liquid which forms a liquid film becomes an upper limit from Numerical formula (1).
More preferable ranges of the surface tension and the water solubility of the liquid film cleaving agent are the same as those in the first embodiment.

  The surface sheet containing the liquid film cleaving agent of the first embodiment and the surface sheet containing the liquid film cleaving agent of the second embodiment preferably further contain a phosphate ester type anionic surfactant. As a result, the hydrophilicity of the fiber surface is increased and the wettability is improved, so that the area where the liquid film and the liquid film cleaving agent are in contact with each other is increased, and blood and urine are surface-active having a phosphate group derived from a living body. Because it has a substance, it can also be used in combination with a surfactant having a phosphate group, and due to the compatibility of the active agent, it also has good affinity with phospholipids contained in blood and urine, so liquid film cleavage The agent easily moves to the liquid film, and the cleavage of the liquid film is further promoted. The content ratio of the liquid membrane cleaving agent to the phosphate ester type anionic surfactant is preferably 1: 1 to 19: 1 in terms of mass ratio (liquid membrane cleaving agent: phosphate ester type anionic surfactant), 2: 1 to 15: 1 is more preferable, and 3: 1 to 10: 1 is still more preferable. In particular, the content ratio is preferably 5: 1 to 19: 1, more preferably 8: 1 to 16: 1, and still more preferably 11: 1 to 13: 1 in terms of mass ratio.

The phosphate ester type anionic surfactant is not particularly limited. For example, specific examples thereof include alkyl ether phosphates, dialkyl phosphates, and alkyl phosphates. Among these, alkyl phosphate ester is preferable from the viewpoint of enhancing the affinity with the liquid film and at the same time imparting the workability of the nonwoven fabric forming the topsheet 1.
Various alkyl ether phosphates can be used without particular limitation. For example, polyoxyalkylene stearyl ether phosphate, polyoxyalkylene myristyl ether phosphate, polyoxyalkylene lauryl ether phosphate, polyoxyalkylene palmityl ether phosphate, Examples include unsaturated carbon chains such as oxyalkylene oleyl ether phosphates and polyoxyalkylene palmitoleyl ether phosphates, and those having side chains in these carbon chains. More preferably, it is a completely neutralized or partially neutralized salt of a mono- or dipolyoxyalkylene alkyl ether phosphate ester having 16 to 18 carbon chains. Examples of the polyoxyalkylene include polyoxyethylene, polyoxypropylene, polyoxybutylene and those obtained by copolymerizing these constituent monomers. Examples of the salt of alkyl ether phosphate include alkali metals such as sodium and potassium, ammonia, and various amines. Alkyl ether phosphates can be used singly or in combination of two or more.
Specific examples of the alkyl phosphate ester include those having a saturated carbon chain such as stearyl phosphate ester, myristyl phosphate ester, lauryl phosphate ester, palmityl phosphate ester, oleyl phosphate ester, palmitoleyl phosphate ester, etc. Examples include unsaturated carbon chains and those having side chains in these carbon chains. More preferably, it is a completely neutralized or partially neutralized salt of a mono- or dialkyl phosphate ester having 16 to 18 carbon chains. Examples of the alkyl phosphate ester salt include alkali metals such as sodium and potassium, ammonia, and various amines. Alkyl phosphate ester can be used individually by 1 type or in mixture of 2 or more types.

  Next, specific examples of the liquid film cleaving agent in the first embodiment and the second embodiment will be described. These are not soluble in water or have poor water-solubility because they are in the specific numerical range described above, and act to cleave the liquid film. On the other hand, surfactants used as conventional fiber treatment agents are practically water-soluble, which are practically dissolved in water and used in the liquid film cleaving agent according to the present invention. Absent.

The liquid film cleaving agent in the first embodiment and the second embodiment is preferably a compound having a mass average molecular weight of 500 or more. This mass average molecular weight greatly affects the viscosity of the liquid film cleaving agent. The liquid film cleaving agent keeps the viscosity high so that it does not easily flow off when the liquid passes between the fibers, and the liquid film cleaving effect in the nonwoven fabric forming the top sheet 1 can be maintained. From the viewpoint of achieving a viscosity that sufficiently maintains the liquid film cleavage effect, the mass average molecular weight of the liquid film cleavage agent is more preferably 1000 or more, further preferably 1500 or more, and particularly preferably 2000 or more. On the other hand, from the viewpoint of the transition of the liquid film cleaving agent from the fiber in which the liquid film cleaving agent is arranged to the liquid film, that is, a viscosity that maintains macro and micro diffusibility, 50000 or less is preferable, and 20000 or less is more preferable. 10,000 or less is more preferable. The mass average molecular weight is measured using a gel permeation chromatograph (GPC) “CCPD” (trade name, manufactured by Tosoh Corporation). The measurement conditions are as follows. The calculated molecular weight is calculated with polystyrene.
Separation column: GMHHR-H + GMHHR-H (cation)
Eluent: L Farmin DM20 / CHCl3
Solvent flow rate: 1.0 ml / min
Separation column temperature: 40 ° C

The liquid film cleaving agent in the first embodiment is preferably a compound having at least one structure selected from the group consisting of the following structures X, XY, and Y-XY, as will be described later. .
In structure X,> C (A)-<C represents a carbon atom. Moreover, <,>, and-show a bond. The same applies hereinafter. _{>, - C (A) 2} -, - C (A) (B) -,> C (A) -C (R 1) <,> C (R 1) -, - C (R 1) (R 2 )-, -C (R ¹ ) ₂ -,> C <, and -Si (R ¹ ) ₂ O-, -Si (R ¹ ) (R ² ) O- Or a siloxane chain having a structure in which two or more kinds are combined, or a mixed chain thereof. At the end of the structure X, a hydrogen atom, or -C (A) ₃ , -C (A) ₂ B, -C (A) (B) _2, -C (A) ₂ -C (R ¹ ) ₃ , -C (R ¹ ) ₂ A, -C (R ¹ ) ₃ , and -OSi (R ¹ ) ₃ , -OSi (R ¹ ) ₂ (R ² ), -Si (R ¹ ) ₃ , -Si (R ¹ ) _{2 It} has at least one group selected from the group consisting of (R ² ).
R ¹ and R ² are each independently a hydrogen atom, an alkyl group (preferably having 1 to 20 carbon atoms, for example, a methyl group, an ethyl group or a propyl group is preferred), an alkoxy group (having 1 to 20 carbon atoms). Preferred examples include various substituents such as a methoxy group and an ethoxy group, an aryl group (preferably having 6 to 20 carbon atoms, eg, a phenyl group), and a halogen atom (eg, a fluorine atom are preferred). Show. A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, or a phenol group. When there are a plurality of R ¹ , R ² , A, and B in the structure X, they may be the same as or different from each other. Moreover, although the continuous bond between C (carbon atom) and Si is usually a single bond, it may contain a double bond or a triple bond, and the bond between C and Si includes an ether group (- O—), amide group (—CONR ^A —: ^RA is a hydrogen atom or a monovalent group), ester group (—COO—), carbonyl group (—CO—), carbonate group (—OCOO—), etc. Groups may be included. The number of one C and Si bonded to other C or Si is 1 to 4, and a long-chain silicone chain (siloxane chain) or mixed chain is branched or has a radial structure. There may be cases.
Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom. For example, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, a phenol group, a polyoxyalkylene group (the oxyalkylene group preferably has 1 to 4 carbon atoms. For example, a polyoxyethylene (POE) group, a polyoxy Propylene (POP) group is preferred), sulfonic acid group, sulfuric acid group, phosphoric acid group, sulfobetaine group, carbobetaine group, phosphobetaine group (these betaine groups are obtained by removing one hydrogen atom from each betaine compound). And a hydrophilic group such as a quaternary ammonium group alone or a combination thereof. In addition to these, the groups and functional groups mentioned in M ¹ described later are also included. When Y is plural, they may be the same or different.
In structures XY and Y-XY, Y is bound to X or a terminal group of X. When Y is bonded to the terminal group of X, the terminal group of X is bonded to Y by removing, for example, the same number of hydrogen atoms as the number of bonds to Y.
In this structure, the hydrophilic groups Y, A, and B can be selected from the groups specifically described to satisfy the aforementioned expansion coefficient, water solubility, and interfacial tension. Thus, the target liquid film cleavage effect is expressed.

  The liquid film cleaving agent is preferably a compound in which the structure X is a siloxane structure. Furthermore, in the liquid film cleaving agent, as specific examples of the structures X, XY, and Y-XY, the structures represented by the following formulas (1) to (11) are arbitrarily combined from siloxane chains. Is preferred. Furthermore, it is preferable from the viewpoint of the liquid film cleaving action that this compound has a mass average molecular weight in the above-mentioned range.

In the formulas (1) to (11), M ¹ , L ¹ , R ²¹ , and R ²² represent the following monovalent or polyvalent (divalent or higher) groups. R ²³ and R ²⁴ represent the following monovalent or polyvalent (divalent or higher) group or a single bond.
M ¹ is a group having a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them, an erythritol group, a xylitol group, a sorbitol group, a glycerin group or an ethylene glycol group. Hydrophilic groups having a plurality of hydroxyl groups (hydrophilic groups formed by removing one hydrogen atom from the above compound having a plurality of hydroxyl groups such as erythritol), hydroxyl groups, carboxylic acid groups, mercapto groups, alkoxy groups (preferably having 1 to 20 carbon atoms) For example, a methoxy group is preferred), amino group, amide group, imino group, phenol group, sulfonic acid group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetaine group, phosphobetaine group, imidazolium betaine group, carbobetaine. Group, epoxy group, carbi It represents a functional group combining a nor group, a (meth) acryl group, or a combination thereof. When M ¹ is a polyvalent group, M ¹ represents a group obtained by removing one or more hydrogen atoms from each of the above groups or functional groups.
L ¹ is an ether group, an amino group (an amino group that can be taken as L ¹ is represented by> NR ^C (R ^C is a hydrogen atom or a monovalent group)), an amide group, an ester group, a carbonyl group, The bonding group of a carbonate group is shown.
R ²¹ , R ²² , R ²³ , and R ²⁴ are each independently an alkyl group (preferably having 1 to 20 carbon atoms. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group) Group, heptyl group, 2-ethylhexyl group, nonyl group and decyl group are preferable), alkoxy group (preferably having 1 to 20 carbon atoms, for example, methoxy group and ethoxy group are preferable), aryl group (having 6 to 6 carbon atoms). 20 is preferable, for example, a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or a halogen atom (for example, a fluorine atom is preferable). In addition, when R < ²² > and R < ²³ > are polyvalent groups, the polyvalent hydrocarbon group remove | excluding one or more hydrogen atoms or fluorine atoms from the said hydrocarbon group is shown.
In addition, when R ²² or R ²³ is bonded to M ¹ , examples of the group that can be taken as R ²² or R ²³ include an imino group that can be taken as R ³² in addition to the above groups, the hydrocarbon group, or the halogen atom. It is done.
The liquid film cleaving agent has a structure represented by any one of formulas (1), (2), (5) and (10) as X, and the end of X or the end of X and Y As the group consisting of, a compound having a structure represented by any one of the above formulas other than these formulas is preferable. Further, X or a group consisting of X terminal and Y has a structure represented by any of the above formulas (2), (4), (5), (6), (8) and (9). A compound composed of a siloxane chain having at least one is preferable.

Specific examples of the compound include organic surfactants (polysiloxanes) that are silicone surfactants. For example, examples of the organic modified silicone modified with a reactive organic group include amino modified, epoxy modified, carboxy modified, diol modified, carbinol modified, (meth) acryl modified, mercapto modified, and phenol modified. Organic modified silicones modified with non-reactive organic groups include polyether modified (including polyoxyalkylene modified), methylstyryl modified, long chain alkyl modified, higher fatty acid ester modified, higher alkoxy modified, higher fatty acid. Examples include modified and fluorine-modified ones. Depending on the type of organic modification, for example, by appropriately changing the molecular weight of the silicone chain, the modification rate, the number of moles of the modifying group, and the like, the expansion coefficient exhibiting the above-mentioned liquid film cleavage action can be obtained. Here, “long chain” refers to those having 12 or more carbon atoms, preferably those having 12 to 20 carbon atoms. Further, “higher” means that having 6 or more carbon atoms, preferably 6 to 20 carbon atoms.
Among them, a modified silicone having a structure in which a liquid film cleaving agent that is a modified silicone has at least one oxygen atom in a modified group, such as polyoxyalkylene-modified silicone, epoxy-modified silicone, carbinol-modified silicone, and diol-modified silicone is preferable. In particular, polyoxyalkylene-modified silicone is preferred. Since the polyoxyalkylene-modified silicone has a polysiloxane chain, it hardly penetrates into the inside of the fiber and tends to remain on the surface. In addition, the addition of a hydrophilic polyoxyalkylene chain is preferable because the affinity with water is increased and the interfacial tension is low, so that the movement on the surface of the liquid film is likely to occur. Therefore, it is preferable that the movement on the surface of the liquid film described above easily occurs. In addition, even if the polyoxyalkylene-modified silicone is subjected to hot melt processing such as embossing, it tends to remain on the fiber surface at that portion, and the liquid film cleavage action is difficult to reduce. In particular, the liquid film cleaving action is sufficiently exhibited at the embossed portion where the liquid tends to accumulate, which is preferable.

  Examples of the polyoxyalkylene-modified silicone include those represented by the following formulas [I] to [IV]. Furthermore, the polyoxyalkylene-modified silicone preferably has a mass average molecular weight within the above-mentioned range from the viewpoint of the liquid film cleavage action.

In the formula, R ³¹ is an alkyl group (preferably having 1 to 20 carbon atoms. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2 ethyl-hexyl group, Nonyl group and decyl group are preferred). R ³² represents a single bond or an alkylene group (preferably having 1 to 20 carbon atoms, for example, a methylene group, an ethylene group, a propylene group or a butylene group is preferred), and preferably represents the alkylene group. The plurality of R ³¹ and the plurality of R ³² may be the same as or different from each other. M ¹¹ represents a group having a polyoxyalkylene group, and a polyoxyalkylene group is preferable. Examples of the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a copolymer of these constituent monomers. m and n are each independently an integer of 1 or more. In addition, the code | symbol of these repeating units is determined separately in each formula (I)-(IV), and does not necessarily show the same integer, and may differ.

Further, the polyoxyalkylene-modified silicone may have one or both modified groups of polyoxyethylene-modified and polyoxypropylene-modified. Further, in order to have a low interfacial tension that is insoluble in water, it is desirable to have a methyl group in the alkyl group R ³¹ of the silicone chain. Although it does not restrict | limit especially as what has this modification group and a silicone chain | strand, For example, there exists a thing of the paragraphs [0006] and [0012] of Unexamined-Japanese-Patent No. 2002-161474. More specifically, polyoxyethylene (POE) polyoxypropylene (POP) modified silicone, polyoxyethylene (POE) modified silicone, polyoxypropylene (POP) modified silicone and the like can be mentioned. Examples of the POE-modified silicone include POE (3) -modified dimethyl silicone added with 3 moles of POE. Examples of the POP-modified silicone include POP (10) -modified dimethyl silicone, POP (12) -modified dimethyl silicone, and POP (24) -modified dimethyl silicone obtained by adding 10 mol, 12 mol, or 24 mol of POP.

In the polyoxyalkylene-modified silicone, the expansion coefficient and water solubility of the first embodiment described above are, for example, the number of added moles of a polyoxyalkylene group (an oxyalkylene group that forms a polyoxyalkylene group with respect to 1 mole of the polyoxyalkylene-modified silicone). ), The following modification rate, and the like. In this liquid film cleaving agent, the surface tension and the interfacial tension can also be set within predetermined ranges in the same manner.
From the above viewpoint, those having an addition mole number of the polyoxyalkylene group of 1 or more are preferable. If it is less than 1, the interfacial tension becomes high for the above-mentioned liquid film cleaving action, and the expansion coefficient becomes small, so that the liquid film cleaving effect becomes weak. In this respect, the number of added moles is more preferably 3 or more, and further preferably 5 or more. On the other hand, if the added mole number is too large, it becomes hydrophilic and the water solubility becomes high. In this respect, the number of added moles is preferably 30 or less, more preferably 20 or less, and still more preferably 10 or less.
If the modification rate of the modified silicone is too low, the hydrophilicity is impaired, so that it is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more. Moreover, since it melt | dissolves in water when too high, 95% or less is preferable, 70% or less is more preferable, and 40% or less is still more preferable. The modification rate of the modified silicone is the ratio of the number of repeating units of the modified siloxane bonding portion to the total number of repeating units of the siloxane bonding portion in one molecule of the modified silicone. For example, (n / m + n) × 100% in the above formulas [I] and [IV], (2 / m) × 100% in the formula [II], and (1 / m) in the formula [III]. × 100%.
In addition, in the polyoxyalkylene-modified silicone, the expansion coefficient and the water solubility described above, in addition to the above-described ones, the modified groups are water-soluble polyoxyethylene groups, water-insoluble polyoxypropylene groups, and polyoxybutylene groups, respectively. By changing the molecular weight of the water-insoluble silicone chain, introducing an amino group, an epoxy group, a carboxy group, a hydroxyl group, a carbinol group, etc. in addition to the polyoxyalkylene modification as the modifying group, etc. Can be set within the range.

The polyalkylene-modified silicone used as the liquid film cleaving agent is preferably contained in an amount of 0.02% by mass to 5% by mass with respect to the fiber mass (Oil Per Unit). The content (OPU) of the polyalkylene-modified silicone is more preferably 1% by mass or less, and further preferably 0.4% by mass or less. By doing so, the tactile sensation of the top sheet 1 becomes preferable. Moreover, from the viewpoint of sufficiently exhibiting the liquid film cleavage effect by the polyalkylene-modified silicone, the content ratio (OPU) is more preferably 0.04% by mass or more, and further preferably 0.1% by mass or more.
In addition, the fiber mass here means the fiber mass of the whole nonwoven fabric containing the containing part 6 and the non-containing part 7 (it is the same also in the content rate (OPU) demonstrated below).

The liquid film cleaving agent in the second embodiment is preferably a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY, as described later.
The structure Z includes:> C (A)-<C: carbon atom>, -C (A) _2- , -C (A) (B)-,> C (A) -C (R ³ ) <,> C Any basic structure of (R ³ )-, -C (R ³ ) (R ⁴ )-, -C (R ³ ) ₂ -,> C <is repeated, or two or more types are combined Represents a hydrocarbon chain of structure. At the end of the structure Z, a hydrogen atom, _{or, -C (A) 3, -C} (A) 2 B, -C (A) (B) 2, -C (A) 2 -C (R 3) 3 , —C (R ³ ) ₂ A, and at least one group selected from the group consisting of —C (R ³ ) ₃ .
R ³ and R ⁴ are each independently a hydrogen atom or an alkyl group (preferably having 1 to 20 carbon atoms. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl Group, a 2-ethyl-hexyl group, a nonyl group and a decyl group are preferred), an alkoxy group (preferably having 1 to 20 carbon atoms, for example, a methoxy group and an ethoxy group are preferred), an aryl group (having 6 to 20 carbon atoms). Preferred examples thereof include a phenyl group.), A fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents such as a fluorine atom. A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, or a phenol group. When there are a plurality of R ³ , R ⁴ , A, and B in the structure Z, they may be the same as or different from each other. In addition, the bond between successive C (carbon atoms) is usually a single bond, but may include a double bond or a triple bond, and the bond between C includes an ether group, an amide group, an ester group. A linking group such as a carbonyl group or a carbonate group may be included. The number of one C bonded to the other C is 1 to 4, and a long hydrocarbon chain may be branched or may have a radial structure.
Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom. For example, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, a phenol group; or a polyoxyalkylene group (the oxyalkylene group preferably has 1 to 4 carbon atoms. For example, a polyoxyethylene group or a polyoxypropylene Group, a polyoxybutylene group, or a polyoxyalkylene group in combination thereof)); or a hydrophilic group having a plurality of hydroxyl groups such as erythritol group, xylitol group, sorbitol group, glycerin group, ethylene glycol group; A hydrophilic group such as a sulfonic acid group, a sulfuric acid group, a phosphoric acid group, a sulfobetaine group, a carbobetaine group, a phosphobetaine group, a quaternary ammonium group, an imidazolium betaine group, an epoxy group, a carbinol group, or a methacryl group; A hydrophilic group composed of the combination. When Y is plural, they may be the same or different.
In the structures ZY and YZY, Y is bonded to Z or a terminal group of Z. When Y is bonded to the terminal group of Z, the terminal group of Z is bonded to Y by removing, for example, the same number of hydrogen atoms as the number of bonds to Y.
In this structure, the hydrophilic groups Y, A, and B can be selected from the groups specifically described to satisfy the aforementioned expansion coefficient, water solubility, and interfacial tension. Thus, the target liquid film cleavage effect is expressed.

  The liquid film cleaving agent is preferably a compound in which the structures represented by the following formulas (12) to (25) are arbitrarily combined as specific examples of the structures Z, ZY, and YZY. . Furthermore, it is preferable from the viewpoint of the liquid film cleaving action that this compound has a mass average molecular weight in the above-mentioned range.

In formulas (12) to (25), M ² , L ² , R ⁴¹ , R ⁴² , and R ⁴³ represent the following monovalent or polyvalent groups (divalent or higher).
M ² is a group having a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group in combination thereof, an erythritol group, a xylitol group, a sorbitol group, a glycerin group or an ethylene glycol group. Hydrophilic groups having a plurality of hydroxyl groups, hydroxyl groups, carboxylic acid groups, mercapto groups, alkoxy groups (preferably having 1 to 20 carbon atoms, for example, methoxy groups are preferred), amino groups, amide groups, imino groups, phenol groups, sulfonic acids Group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetaine group, phosphobetaine group, imidazolium betaine group, carbobetaine group, epoxy group, carbinol group, (meth) acryl group, or a functional group combining them. Show.
L ² is an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, or a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them. The bonding group of is shown.
R ⁴¹ , R ⁴² and R ⁴³ are each independently a hydrogen atom or an alkyl group (preferably having 1 to 20 carbon atoms. For example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group) , A heptyl group, a 2-ethylhexyl group, a nonyl group, and a decyl group are preferable, an alkoxy group (preferably having 1 to 20 carbon atoms, for example, a methoxy group and an ethoxy group are preferable), and an aryl group (having 6 to 20 carbon atoms). For example, a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a halogen atom (for example, a fluorine atom is preferable).
If R ⁴² is a polyvalent group, R ⁴² is the above-described substituent, further showing a group obtained by removing one or more hydrogen atoms.
In addition, another structure may be arbitrarily connected to the tip of the bond described in each structure, or a hydrogen atom may be introduced.

Further, specific examples of the compound include the following compounds, but are not limited thereto.
First, polyether compounds and nonionic surfactants can be mentioned. Specifically, a polyoxyalkylene alkyl (POA) ether represented by any one of the formula (V), a polyoxyalkylene glycol represented by the formula (VI) having a mass average molecular weight of 1000 or more, steareth, behenez, PPG Examples include myristyl ether, PPG stearyl ether, and PPG behenyl ether. As the polyoxyalkylene alkyl ether, lauryl ether added with 3 moles to 24 moles, preferably 5 moles of POP is preferable. As the polyether compound, polypropylene glycol having a weight average molecular weight of 1000 to 10,000, preferably 3000, to which polypropylene glycol is added in an amount of 17 to 180 mol, preferably about 50 mol, is preferable. In addition, the measurement of said mass mean molecular weight can be performed with the measuring method mentioned above.

  The polyether compound and the nonionic surfactant are preferably contained in an amount of 0.1% by mass to 5% by mass with respect to the fiber mass (Oil Per Unit). The content ratio (OPU) of the polyether compound or nonionic surfactant is more preferably 1% by mass or less, and further preferably 0.4% by mass or less. By doing so, the tactile sensation of the top sheet 1 becomes preferable. Further, from the viewpoint of sufficiently exhibiting the liquid film cleavage effect by the polyether compound or the nonionic surfactant, the content ratio (OPU) is more preferably 0.15% by mass or more, and further 0.2% by mass or more. preferable.

In the formula, L ²¹ represents an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them, A linking group such as R ⁵¹ is a hydrogen atom, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, nonyl group, decyl group, methoxy group, ethoxy group, phenyl group , A fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a fluorine atom. A, b, m and n are each independently an integer of 1 or more. Here, C _m H _n represents an alkyl group (n = 2m + 1), and C _a H _b represents an alkylene group (a = 2b). The number of carbon atoms and the number of hydrogen atoms are determined independently in each of the formulas (V) and (VI), and do not necessarily indicate the same integer, and may be different. Hereinafter, the same applies to m, m ′, m ″, n, n ′, and n ″ in formulas (VII) to (XV). In addition, “m” in — (C _a H _b O) _m — is an integer of 1 or more. The value of this repeating unit is determined independently in each of the formulas (V) and (VI), and does not necessarily indicate the same integer, and may be different.

The expansion coefficient, surface tension and water solubility of the second embodiment described above can be set within a predetermined range in the polyether compound or nonionic surfactant, for example, depending on the number of moles of the polyoxyalkylene group. . From this viewpoint, the number of moles of the polyoxyalkylene group is preferably 1 or more and 70 or less. By setting it to 1 or more, the above-mentioned liquid film cleavage action is sufficiently exhibited. In this respect, the number of moles is more preferably 5 or more, and even more preferably 7 or more. On the other hand, the added mole number is preferably 70 or less, more preferably 60 or less, and still more preferably 50 or less. By doing so, the entanglement of the molecular chain becomes moderately weak, and the diffusibility in the liquid film is excellent, which is preferable.
In addition, the expansion coefficient, surface tension, interfacial tension and water solubility described above are the same for water-soluble polyoxyethylene groups, water-insoluble polyoxypropylene groups and polyoxybutylene groups in polyether compounds and nonionic surfactants, respectively. Use in combination, change the chain length of the hydrocarbon chain, use a hydrocarbon chain having a branched chain, use a hydrocarbon chain having a double bond, benzene ring or naphthalene in the hydrocarbon chain It can be set within a predetermined range by using one having a ring or by appropriately combining the above.

  Secondly, hydrocarbon compounds having 5 or more carbon atoms can be mentioned. The number of carbon atoms is preferably 100 or less, more preferably 50 or less, from the viewpoint that the liquid is more easily expanded to the liquid film surface. This hydrocarbon compound excludes polyorganosiloxane, and is not limited to a straight chain, but may be a branched chain, and the chain is not particularly limited to saturated or unsaturated. Moreover, you may have substituents, such as ester and ether, in the middle and the terminal. Among them, those which are liquid at normal temperature are preferably used alone. This hydrocarbon compound is preferably contained in an amount of 0.1% by mass or more and 5% by mass or less as a content ratio to the fiber mass (Oil Per Unit). The content ratio (OPU) of the hydrocarbon compound is preferably 1% by mass or less, more preferably 0.99% by mass or less, and still more preferably 0.4% by mass or less. By doing so, the tactile sensation of the top sheet 1 becomes preferable. Further, from the viewpoint of sufficiently exhibiting the liquid film cleavage effect due to the content of the hydrocarbon compound, the content (OPU) is more preferably 0.15% by mass or more, and further preferably 0.2% by mass or more.

Hydrocarbon compounds include oils or fats, such as natural oils or natural fats. Specific examples include coconut oil, camellia oil, castor oil, coconut oil, corn oil, olive oil, sunflower oil, tall oil, and mixtures thereof.
Moreover, the fatty acids as represented by Formula (VII), such as caprylic acid, capric acid, oleic acid, lauric acid, palmitic acid, stearic acid, myristic acid, behenic acid, and mixtures thereof, can be mentioned.

In the formula, m and n are each independently an integer of 1 or more. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

  Examples of linear or branched, saturated or unsaturated, substituted or unsubstituted polyhydric alcohol fatty acid esters or mixtures of polyhydric alcohol fatty acid esters, as represented by formula (VIII-I) or (VIII-II), Examples thereof include glycerin fatty acid esters and pentaerythritol fatty acid esters, and specific examples include glyceryl tricaprylate, glyceryl tripalmitate, and mixtures thereof. The mixture of glycerin fatty acid ester and pentaerythritol fatty acid ester typically contains some mono-, di-, and triesters. Preferable examples of the glycerin fatty acid ester include glyceryl tricaprylate, a mixture of glyceryl tricapryate, and the like. Also, from the viewpoint of reducing the interfacial tension and obtaining a higher expansion coefficient, a polyhydric alcohol fatty acid ester having a polyoxyalkylene group introduced to such an extent that water insolubility can be maintained may be used.

In the formula, m, m ′, m ″, n, n ′, and n ″ are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _{Here, C m H n, C m} 'H n' and _{C m ''} H _n '' are each a hydrocarbon group of each of the fatty acid.

  Examples of fatty acids or fatty acid mixtures in which linear or branched, saturated or unsaturated fatty acids form esters with polyols having a large number of hydroxyl groups, and some of the hydroxyl groups remain unesterified are represented by the formula ( IX), a glycerin fatty acid ester, a sorbitan fatty acid ester, and a partially esterified product of pentaerythritol fatty acid ester represented by any one of formula (X) or formula (XI). Specifically, ethylene glycol monomyristate, ethylene glycol dimyristate, ethylene glycol palmitate, ethylene glycol dipalmitate, glyceryl dimyristate, glyceryl dipalmitate, glyceryl monooleate, sorbitan monooleate, sorbitan monostearate Rate, sorbitan dioleate, sorbitan tristearyl, pentaerythritol monostearate, pentaerythritol dilaurate, pentaerythritol tristearate, and mixtures thereof. Note that a mixture composed of partially esterified products such as glycerin fatty acid ester, sorbitan fatty acid ester, and pentaerythritol fatty acid ester typically contains some fully esterified compound.

In the formula, m and n are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

In the formula, R ⁵² represents a linear or branched, saturated or unsaturated hydrocarbon group (an alkyl group, an alkenyl group, an alkynyl group, or the like) having 2 to 22 carbon atoms. Specific examples include 2-ethylhexyl group, lauryl group, myristyl group, palmityl group, stearyl group, behenyl group, oleyl group, linole group and the like.

In the formula, m and n are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

  Moreover, a sterol, a phytosterol, and a sterol derivative are mentioned. Specific examples include cholesterol, sitosterol, stigmasterol, ergosterol, and mixtures thereof having a sterol structure of the formula (XII).

  Specific examples of the alcohol include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, and mixtures thereof as represented by the formula (XIII).

In the formula, m and n are each independently an integer of 1 or more. _Here, C m _{H n} is a hydrocarbon group of each of the above alcohol.

  Specific examples of the fatty acid ester include isopropyl myristate, isopropyl palmitate, cetylethylhexanoate, triethylhexanoin, octyldodecyl myristate, ethylhexyl palmitate, ethylhexyl stearate, butyl stearate represented by the formula (XIV). Rate, myristyl myristate, stearyl stearate, cholesteryl isostearate and mixtures thereof.

In the formula, m and n are each independently an integer of 1 or more. Here, two C _m H _n may be the same or different. C _m H _n -COO- of _C m _{H n} is a hydrocarbon group of each of the above fatty acids. _C m _{H n} of -COOC _m H _n is a hydrocarbon group derived from the alcohol to form an ester.

  Specific examples of the wax include ceresin, paraffin, petroleum jelly, mineral oil, and liquid isoparaffin as represented by the formula (XV).

  In the formula, m and n are each independently an integer of 1 or more.

  The expansion coefficient, surface tension, water solubility, and interfacial tension of the second embodiment described above can maintain, for example, a hydrophilic polyoxyethylene group in water-insoluble in the above-described hydrocarbon compound having 5 or more carbon atoms. Introducing polyoxypropylene groups and polyoxybutylene groups that can reduce the interfacial tension, introducing hydrophobic chains, changing the chain length of hydrocarbon chains, and adding branched chains to hydrocarbon chains It can be set within a predetermined range by using one having a double bond in the hydrocarbon chain, using one having a benzene ring or a naphthalene ring in the hydrocarbon chain, and the like.

  In the nonwoven fabric which comprises the surface sheet 1, other components may be contained if necessary in addition to the liquid film cleaving agent described above. Further, the liquid film cleaving agent of the first embodiment and the liquid film cleaving agent of the second embodiment may be used in combination of both agents in addition to the forms used separately. This point is the same for the first compound and the second compound in the liquid film cleaving agent of the second embodiment.

In the nonwoven fabric according to the present invention, when the contained liquid film cleaving agent or phosphate ester type anionic surfactant is identified, the surface tension of the liquid film (liquid having a surface tension of 50 mN / m) ( The identification method described in the measurement method such as [gamma] w) can be used.
Further, when the component of the liquid film cleaving agent is a compound having a siloxane chain as the main chain or a hydrocarbon compound having 1 to 20 carbon atoms, the content ratio (OPU) with respect to the fiber mass is obtained by the above-described analysis method. It can be determined by dividing the content of the liquid film cleaving agent by the mass of the fiber based on the mass of the material.

The nonwoven fabric constituting the top sheet 1 has high liquid permeability regardless of the thickness of the fiber and the distance between the fibers. However, the nonwoven fabric of the present invention is particularly effective when thin fibers are used. When thin fibers are used to make the nonwoven fabric softer than usual, the distance between the fibers decreases, and the narrow area between the fibers increases. For example, in the case of a generally used nonwoven fabric (fineness: 2.4 dtex), the distance between fibers is 120 μm, and the formed liquid film area ratio is about 2.6%. However, when the fineness is lowered to 1.2 dtex, the distance between the fibers is 85 μm, and the liquid film area ratio is about 7.8%, which is about three times that of a normal nonwoven fabric. On the other hand, the liquid film cleaving agent according to the present invention reliably cleaves the liquid film that occurs frequently and reduces the liquid residue. As will be described later, the liquid film area ratio is a liquid film area ratio calculated by image analysis from the nonwoven fabric surface, and has a strong correlation with the liquid remaining state on the outermost surface of the surface material. Therefore, when the liquid film area ratio decreases, the liquid in the vicinity of the skin is removed, the comfort after excretion is increased, and the absorbent article is comfortable to wear after excretion. On the other hand, the liquid remaining amount mentioned later means the liquid amount currently hold | maintained at the whole nonwoven fabric. If the liquid film area ratio is reduced, the liquid remaining is reduced although it is not generally proportional. Further, the whiteness of the surface is expressed as an L value described later. The L value tends to decrease the remaining liquid amount and increase the numerical value due to the tearing of the liquid film on the surface, and whiteness tends to stand out visually. The nonwoven fabric containing the liquid film cleaving agent according to the present invention can reduce the liquid film area ratio and the remaining amount of liquid even if the fiber is thinned, and can increase the L value. And at a high level. In addition, by using the nonwoven fabric according to the present invention as a constituent member such as a surface material of an absorbent article, the dry feeling at the part that touches the skin is high, and stains due to body fluids are not noticeable due to visual whiteness. It is possible to provide an absorbent article that realizes a comfortable comfort with reduced worry.
In the nonwoven fabric containing such a liquid film cleaving agent, the distance between the fibers of the nonwoven fabric is preferably 150 μm or less, and more preferably 90 μm or less, from the viewpoint of increasing the softness of the touch. Further, the lower limit is preferably 50 μm or more, and more preferably 70 μm or more, from the viewpoint of suppressing the liquid permeability from being impaired due to excessive narrowing between fibers. Specifically, 50 μm or more and 150 μm or less is preferable, and 70 μm or more and 90 μm or less is more preferable.
In this case, the fineness of the fiber is preferably 3.3 dtex or less, and more preferably 2.4 dtex or less. The lower limit is preferably 0.5 dtex or more, and more preferably 1 dtex or more. Specifically, it is preferably 0.5 dtex or more and 3.3 dtex or less, and more preferably 1 dtex or more and 2.4 dtex or less.

(Measurement method of distance between fibers)
The interfiber distance is obtained by measuring the thickness of the nonwoven fabric to be measured as follows and applying it to the following formula (2).
First, the nonwoven fabric to be measured is cut into a longitudinal direction of 50 mm and a width direction of 50 mm to produce a cut piece of the nonwoven fabric. If you cannot obtain a cut piece of this size, such as when the nonwoven fabric to be measured is incorporated in absorbent articles such as sanitary products and disposable diapers, cut the cut piece to the maximum size that can be obtained. Is made.
The thickness of this cut piece is measured with a pressure of 49 Pa. The measurement environment is a temperature of 20 ± 2 ° C., the relative humidity is 65 ± 5%, and the measurement instrument is a microscope (manufactured by Keyence Corporation, VHX-1000). First, an enlarged photograph of the nonwoven fabric cross section is obtained. In the magnified picture, a photograph of a known size is taken at the same time. A scale is matched with the enlarged photograph of the cross section of the nonwoven fabric, and the thickness of the nonwoven fabric is measured. The above operation is performed three times, and the average value of the three times is defined as the thickness [mm] of the dried nonwoven fabric. In the case of a laminated product, the boundary is determined from the fiber diameter, and the thickness is calculated.
Next, the inter-fiber distance of the fibers constituting the nonwoven fabric to be measured is determined by the following formula based on Wrotnowski's assumption. An expression based on the assumption of Wrotnowski is generally used when determining the inter-fiber distance of the fibers constituting the nonwoven fabric. According to a formula based on the assumption of Wrotnowski, the interfiber distance A (μm) is the thickness h (mm) of the nonwoven fabric, the basis weight e (g / m ² ), the fiber diameter d (μm) of the fibers constituting the nonwoven fabric, It is calculated | required by the following Numerical formula (2) by fiber density (rho) (g / cm < ³ >). In addition, when it has an unevenness | corrugation, it calculates using the nonwoven fabric thickness h (mm) of a convex part as a representative value.
The fiber diameter d (μm) is measured using a scanning electron microscope (DSC6200, manufactured by Seiko Instruments Inc.), 10 fiber cross-sections, and the average value is defined as the fiber diameter.
The fiber density ρ (g / cm ³ ) is measured according to the measuring method of the density gradient tube method described in JIS L1015 chemical fiber staple test method using a density gradient tube.
The basis weight e (g / m ² ) is obtained by cutting the nonwoven fabric to be measured into a predetermined size (0.12 m × 0.06 m or the like), and after mass measurement, “mass ÷ area determined from the predetermined size = The basis weight is calculated by the formula of “basis weight (g / m ² )”.

(Method for measuring fineness of constituent fibers)
The cross-sectional shape of the fiber is measured with an electron microscope or the like, and the cross-sectional area of the fiber (the cross-sectional area of each resin component in a fiber formed of a plurality of resins) is measured, and the resin is measured with a DSC (differential thermal analyzer). Is specified (in the case of multiple resins, the approximate component ratio is also), the specific gravity is determined, and the fineness is calculated. For example, in the case of short fibers composed only of PET, the cross section is first observed and the cross sectional area is calculated. Then, by measuring with DSC, it is comprised from single component resin from melting | fusing point and peak shape, and it identifies that it is a PET core. Then, the fineness is calculated by calculating the mass of the fiber using the density and cross-sectional area of the PET resin.

  As the nonwoven fabric fibers constituting the top sheet 1, those normally used for this type of article can be employed without particular limitation. For example, various materials such as heat-fusible core-sheath composite fiber, heat-extensible fiber, non-heat-extensible fiber, heat-shrinkable fiber, non-heat-shrinkable fiber, three-dimensional crimped fiber, latent crimped fiber, hollow fiber, etc. Mention may be made of fibers. In particular, it is preferable to have a thermoplastic resin. Moreover, it is preferable that a non-heat-extensible fiber and a non-heat-shrinkable fiber are heat-fusible. The core-sheath type composite fiber may be a concentric core-sheath type, an eccentric core-sheath type, a side-by-side type, or an irregular shape, and is preferably a concentric core-sheath type. In the production of the fiber and the nonwoven fabric, the liquid film cleaving agent, or the liquid film cleaving agent and the phosphate type anionic surfactant may be contained in the fiber in any step. For example, a fiber film cleaving agent or a mixture of a liquid film cleaving agent and a phosphoric acid type anionic surfactant may be blended and applied to a fiber spinning oil that is usually used for fiber spinning. A liquid film cleaving agent or a mixture of a liquid film cleaving agent and a phosphoric acid type anionic surfactant may be blended and applied to the finishing oil. Moreover, a liquid film cleaving agent or a phosphate ester type anionic surfactant may be blended with a fiber treatment agent usually used in the production of nonwoven fabrics, and may be applied to the fibers, or may be applied after forming into a nonwoven fabric.

  Since the nonwoven fabric which comprises the surface sheet 1 contains a liquid film cleaving agent or a phosphate ester type anionic surfactant in addition to this, it is excellent in liquid remaining suppression corresponding to various fiber structures. Therefore, even when a large amount of liquid is applied to the nonwoven fabric, a liquid passage between the fibers is always ensured and the liquid permeability is excellent. Thereby, a various function can be added to a nonwoven fabric, without being restrict | limited to the problem of the distance between fibers and liquid film formation. For example, it may be composed of one layer or may be composed of two or more layers. Moreover, the shape of a nonwoven fabric may be flat, the one side or both sides may be uneven, and the basis weight or density of the fiber may be variously changed. Also when applying a liquid film cleaving agent to the nonwoven fabric which has an uneven | corrugated shape, a liquid film cleaving agent can be contained in the pattern shown by FIGS. 3-6, and other arbitrary patterns. In general, when the surface liquid flow of a film sheet having no voids on the surface and a nonwoven sheet having voids is compared, if the entire sheet is hydrophilic, the nonwoven sheet is more hydrophilic as a whole sheet Performance is exhibited and the liquid flow is shorter than the film sheet. On the other hand, when the whole sheet is hydrophobic, the nonwoven fabric sheet exhibits more hydrophobic performance as the whole sheet, and the liquid flow becomes longer than the film sheet. This is based on Cassie-Baxter's theory (Satoshi Sakurai, “Super water-repellency and super hydrophilicity—its mechanism and application”, Yoneda Publishing, 2009, first edition, p38). This tendency is more prominent in the case of an uneven nonwoven fabric than a flat nonwoven fabric. Therefore, this invention has a remarkable effect by the case of an uneven | corrugated nonwoven fabric rather than a flat nonwoven fabric. When a liquid film cleaving agent is contained in a nonwoven fabric having an uneven shape, a liquid film cleaving agent is included at the top of the convex part, and the containing part is arranged, and a liquid film cleaving agent is not contained at the bottom of the concave part. A part can be arranged. At this time, a pattern in which the top part of the convex part has the inclusion part, a pattern in which the bottom part of the concave part has the non-contained part, the convex part and the inclusion part match, the concave part and the non-contained part, There are patterns that match. Thereby, the liquid flow prevention property on the surface can be enhanced even with the uneven nonwoven fabric while realizing a high level of liquid remaining reduction with the convex portions that are easily in contact with the skin. In addition, this coating pattern has a convex portion in contact with the printing roll when a liquid film cleaving agent is applied to a nonwoven fabric having a concavo-convex shape by a printing method such as a flexographic printing method. preferable. When the convex part and the containing part match, the pattern of the containing part of the nonwoven fabric shown in FIG. 9 is the same as or similar to that shown in FIG. Furthermore, since the surface sheet 1 is excellent in liquid permeability due to the action of the liquid film cleaving agent, the range of options for the combination with the absorber is widened. Moreover, the liquid film cleaving agent in case the nonwoven fabric which comprises the surface sheet 1 consists of multiple layers may be contained in all the layers, and may be contained in part. It is preferably contained in at least the layer on the skin contact surface side.

In the nonwoven fabric constituting the surface sheet 1, it is preferable that the liquid film cleaving agent is localized in the vicinity of at least some of the fiber entanglement points or the fiber fusion points. The “localization” of the liquid film cleaving agent here is not a state in which the liquid film cleaving agent uniformly adheres to the entire surface of the fibers constituting the nonwoven fabric, but near the fiber entanglement point or fiber fusion point rather than the surface of each fiber. A state in which it is attached in the vicinity of the landing point. Specifically, it can be defined that the concentration of the liquid film cleaving agent near the entanglement point or the fusion point is higher than the fiber surface (the fiber surface between the entanglement points or between the fusion points). At that time, the liquid film cleaving agent present near the fiber entanglement point or near the fiber fusion point may be attached so as to partially cover the space between the fibers around the fiber entanglement point or fiber fusion point. Good. The higher the concentration of the liquid film cleaving agent near the confounding point or the fusion point, the better. The concentration varies depending on the type of liquid film cleaving agent used, the type of fiber used, the ratio of active ingredients when mixed with other agents, etc., but is not uniquely determined. It can be determined as appropriate from the standpoint of exhibiting.
Due to the localization of the liquid film cleaving agent, the liquid film cleaving action is more easily expressed. That is, the vicinity of the fiber entanglement point or the vicinity of the fiber fusion point is a place where a liquid film is particularly likely to be formed. Therefore, the presence of more liquid film cleaving agent at that place makes it easier to act directly on the liquid film.
In this way, the localization of the liquid film cleaving agent is preferably generated at 30% or more near the fiber entanglement point or near the fiber fusion point of the whole nonwoven fabric, more preferably 40% or more, and more preferably 50%. It is more preferable that it occurs at% or more. Among non-woven fabrics, where the distance between fiber entanglement points or fiber fusion points is relatively short, the space between the fibers is small, and a liquid film is particularly likely to occur. Therefore, it is particularly preferable that the liquid film cleaving agent is selectively localized near the fiber intersection or the fiber fusion point where the space between the fibers is small because the liquid film cleaving action is effectively exhibited. In the case of selective localization as described above, it is preferable that the liquid film cleaving agent increases the coverage of a relatively small interfiber space and decreases the coverage of a relatively large interfiber space. As a result, it is possible to effectively express the cleaving action at the portion where the capillary force is large and the liquid film is likely to be generated while maintaining the liquid permeability in the nonwoven fabric, and the liquid remaining reducing effect in the entire nonwoven fabric is enhanced. Here, the “relatively small inter-fiber space” refers to an inter-fiber space having a fiber-to-fiber distance of 1/2 or less with respect to the inter-fiber distance determined by the above-described (inter-fiber distance measurement method).

(Method for confirming the localized state of the liquid film cleaving agent)
The localized state of the liquid film cleaving agent can be confirmed by the following method.
First, a nonwoven fabric is cut into 5 mm x 5 mm, and it attaches to a sample stand using a carbon tape. The sample stage is placed in a scanning electron microscope (S4300SE / N, manufactured by Hitachi, Ltd.) in an undeposited state, and is brought to a low vacuum or a vacuum state. Since detection is performed using an annular backscattered electron detector (accessory), the larger the atomic number, the easier it is to emit backscattered electrons. Therefore, polyethylene (PE), polypropylene (PP), and polyester (PET) are mainly used. Since the portion coated with the liquid film cleaving agent containing more oxygen atoms and silicon atoms having a larger atomic number than carbon atoms and hydrogen atoms constituting it appears in white, the localization state can be confirmed by whiteness. The whiteness increases as the atomic number increases or the amount of adhesion increases.

  Moreover, when manufacturing the nonwoven fabric which comprises the surface sheet 1, the method normally used for this kind of articles | goods is employable. For example, a card method, an airlaid method, a spunbond method, or the like can be used as a method for forming a fiber web. As a method for making a fiber web into a non-woven fabric, various commonly used non-woven fabric methods such as spunlace, needle punch, chemical bond, and dot embossing can be adopted. Among these, from the viewpoint of touch, an air-through nonwoven fabric and a spunbonded nonwoven fabric are preferable. The “air-through nonwoven fabric” as used herein refers to a nonwoven fabric produced through a process (air-through treatment process) in which a fluid of 50 ° C. or higher, for example, gas or water vapor, is sprayed onto the web or the nonwoven fabric. The “spunbond nonwoven fabric” refers to a laminated nonwoven fabric manufactured by a spunbond method. This means not only non-woven fabrics produced only in this step, but also non-woven fabrics produced by adding this step to non-woven fabrics produced by other methods or non-woven fabrics produced by performing some steps after this step. Moreover, the nonwoven fabric of this invention is not restricted to what consists only of an air through nonwoven fabric and a spun bond nonwoven fabric, The air through nonwoven fabric and what combined the fiber sheet and film materials, such as a spun bond nonwoven fabric and another nonwoven fabric, are included.

In the manufacturing method of the nonwoven fabric which comprises the surface sheet 1, when applying a liquid film cleaving agent after making into a nonwoven fabric as mentioned above, the method of immersing a raw material nonwoven fabric in the solution containing a liquid film cleaving agent is mentioned. Examples of the solution include a solution obtained by diluting a liquid film cleaving agent with a solvent (hereinafter, this solution is also referred to as a liquid film cleaving agent solution). Examples of the solvent to be diluted include alcohols such as ethanol. Moreover, as another method, the method of apply | coating the liquid film cleaving agent single-piece | unit or the solution containing the said liquid film cleaving agent with respect to a raw material nonwoven fabric is mentioned. A phosphate ester type anionic surfactant may be mixed in the solution containing the liquid film cleaving agent. In this case, the content ratio of the liquid film cleaving agent and the phosphate ester type anionic surfactant is preferably as described above. As the solvent, there can be used any solvent that can dissolve and disperse a liquid film cleaving agent having an extremely low water solubility in a solvent in an appropriate amount so that it can be easily applied to a non-woven fabric. For example, when an organic solvent such as ethanol, methanol, acetone, hexane or the like is used as the solution to be dissolved, water can naturally be used as a solvent or a dispersion medium, and alkylphosphoric acid is used as an emulsifier when emulsifying. Examples include various surfactants including esters, fatty acid amides, alkylbetaines, sodium alkylsulfosuccinates, and the like. In addition, a raw material nonwoven fabric means the thing before apply | coating a liquid film cleaving agent, As the manufacturing method, the manufacturing method normally used as mentioned above can be especially used without a restriction | limiting.
As a method of applying to the raw material nonwoven fabric, those used for the nonwoven fabric manufacturing method can be employed without any particular limitation. For example, application by spraying, application by slot coater, application by gravure method, flexo method, dipping method and the like can be mentioned.
From the viewpoint of localization of the liquid film cleaving agent near the fiber entanglement point or near the fiber fusion point described above, it is preferable to apply to the raw material nonwoven fabric after being made into a nonwoven fabric, not to the raw material nonwoven fabric. A coating method is more preferable. Among the coating methods, the flexo coating method is particularly preferable from the viewpoint of clarifying the localization of the liquid film cleaving agent.
Moreover, as a raw material nonwoven fabric, a various nonwoven fabric can be especially used without a restriction | limiting. In particular, from the viewpoint of maintaining the localization of the liquid film cleaving agent, it is preferable that the fiber entanglement point is heat-sealed or thermocompression bonded, and the non-woven fabric obtained by thermally bonding fibers by air-through treatment or heat embossing as described above It is more preferable to use

  When the liquid film cleaving agent is attached to the fiber, it is preferably used as a fiber treatment agent containing the liquid film cleaving agent. The “fiber treatment agent” described here means that an oily liquid film cleaving agent having extremely low water solubility is easily applied to a raw material nonwoven fabric or fiber by emulsifying with water and a surfactant. This is what is in a state. In the fiber treatment agent for applying the liquid film cleaving agent, the content ratio of the liquid film cleaving agent is preferably 50% by mass or less with respect to the mass of the fiber treatment agent. Thereby, the fiber treatment agent can be made into the state which emulsified stably the liquid film cleaving agent used as an oily component in a solvent. From the viewpoint of stable emulsification, the content ratio of the liquid film cleaving agent is more preferably 40% by mass or less, and further preferably 30% by mass or less with respect to the mass of the fiber treatment agent. Moreover, it is preferable to set it as said content rate from a viewpoint which a liquid film cleaving agent moves on a fiber with a moderate viscosity after coating, and implement | achieves localization of the liquid film cleaving agent in the nonwoven fabric mentioned above. The content ratio of the liquid film cleaving agent is preferably 5% by mass or more, more preferably 15% by mass or more, and further preferably 25% by mass or more with respect to the mass of the fiber treatment agent from the viewpoint of expressing a sufficient liquid film cleavage effect. preferable. In addition, the fiber processing agent containing a liquid film cleaving agent may contain another agent in the range which does not inhibit the effect | action of a liquid film cleaving agent. For example, the phosphate ester type anionic surfactant described above may be included. In this case, the content ratio of the liquid film cleaving agent and the phosphate ester type anionic surfactant is preferably as described above. In addition, it may contain an antistatic agent or anti-friction agent used in fiber processing, a hydrophilizing agent imparting moderate hydrophilicity to the nonwoven fabric, an emulsifying agent imparting emulsification stability, and the like.

As a preferred embodiment of the nonwoven fabric constituting the top sheet 1, specific examples of those having an uneven shape will be described.
For example, the thing shown in FIG. 9 using a heat-shrinkable fiber is mentioned (1st embodiment). The nonwoven fabric 100 shown in FIG. 9 is composed of two layers, an upper layer 101 on the upper surface 1A (skin contact surface when used as a surface sheet) and a lower layer 102 on the lower surface 1B (non-skin contact surface when used as a surface sheet) side. Become. Further, embossing (squeezing) is performed in the thickness direction from the upper surface 1A, and the two layers are joined (the embossed part is referred to as an embossed recess (concave joint) 130). The lower layer 102 is a layer in which heat shrinkage of the heat-shrinkable fiber is expressed. The upper layer 101 is a layer containing non-heat-shrinkable fibers, and the non-heat-shrinkable fibers are partially bonded by the concave bonding portion 13. Non-heat-shrinkable fibers are not limited to those that do not shrink at all, but include those that shrink to such an extent that the heat-shrinkable fibers of the lower layer 12 are not inhibited. As this non-heat-shrinkable fiber, a non-heat-shrinkable heat-fusible fiber is preferable from the viewpoint of forming a nonwoven fabric by heat.
This nonwoven fabric 100 can be manufactured by the raw material and manufacturing method of the paragraphs [0032]-[0048] of Unexamined-Japanese-Patent No. 2002-187228, for example. In this production, for example, after embossing the laminated body of the upper layer 101 and the lower layer 102 from the upper layer side 101, the heat-shrinkable fibers are thermally contracted by heat treatment. At this time, the embossed portions adjacent to each other are pulled by the contraction of the fibers, and the distance between them is reduced. Due to this deformation, the fibers of the upper layer 101 protrude from the embossed concave portion 130 toward the upper surface 1 </ b> A to form a convex portion 140. Alternatively, the upper layer is laminated in a state where the lower layer 102 in which heat shrinkage is developed is stretched, and the above-described embossing is performed. Thereafter, when the extended state of the lower layer 102 is released, the upper layer 101 side rises to the upper surface 1A side, and the convex portion 140 is formed. This embossing can be performed by a commonly used method such as heat embossing or ultrasonic embossing. Moreover, regarding the joining of both layers, a joining method using an adhesive may be used.

  In the nonwoven fabric 100 manufactured as described above, the upper layer 101 is squeezed and joined to the lower layer side 102 in the embossed recess (concave joint) 130. The embossed recesses 130 are formed in the form of dots in the plane direction of the nonwoven fabric 100, and the portion surrounded by the embossed recesses 130 is the above-described convex portion 140 where the upper layer 101 is raised. The convex portion 140 has a three-dimensional solid shape, for example, a dome shape. The convex part 140 formed by the manufacturing method as described above has a fiber in a coarser state than the lower layer 102. The inside of the convex portion 140 may be filled with fibers as shown in FIG. 9 or may have a hollow portion formed by separating the upper layer 101 and the lower layer 102. The arrangement of the embossed recesses 130 and the projections 140 may be arbitrary, and may be a grid arrangement, for example. Examples of the lattice arrangement include an arrangement in which a plurality of rows of a plurality of embossed concave portions 130 are arranged, and the embossed concave portions 130 in each row are shifted by an anti-pitch between adjacent rows. In addition, when the embossed recess 130 is viewed in a plan view, it may be a circle, an ellipse, a triangle, a rectangle, or other polygonal shapes, and can be arbitrarily set as appropriate. Further, the embossed recess 130 may have a linear shape in addition to the dot shape.

Since the nonwoven fabric 100 has an uneven surface having the convex portion 140 and the embossed concave portion 130 on the upper surface 1A side, the nonwoven fabric 100 is excellent in shape recoverability when stretched in the plane direction and compression deformability when compressed in the thickness direction. . Moreover, it becomes a comparatively bulky nonwoven fabric by the protrusion of the fibers of the upper layer 101 as described above. Thereby, the user who touched the nonwoven fabric 10 can feel a soft gentle touch. Further, in an absorbent article in which the nonwoven fabric 100 is incorporated as a surface sheet having the upper surface 1A as the skin contact surface and the lower surface 1B as the non-skin contact surface, the skin contact surface side is uneven with protrusions 140 and embossed recesses 130. Excellent breathability.
The nonwoven fabric 100 has less liquid residue due to the action of the liquid film cleaving agent described above or the cooperative action of the liquid film cleaving agent and the phosphate ester type anionic surfactant. Thereby, the liquid permeability using the uneven | corrugated surface and the dense part of embossing can further be improved.

  In addition, the nonwoven fabric 100 is not restricted to the two-layer structure of the upper layer 101 and the lower layer 102, and may have another layer. For example, a single layer or a plurality of layers may be disposed between the upper layer 101 and the lower layer 102, and a single layer or a plurality of layers may be disposed on the upper surface 1A side and the lower surface 1B side of the nonwoven fabric 100. This single layer or multiple layers may be a layer having heat-shrinkable fibers or a layer having non-heat-shrinkable fibers.

An appropriate range of the basis weight of the web used for manufacturing the nonwoven fabric constituting the top sheet 1 is selected according to the specific use of the target nonwoven fabric. The basis weight of the nonwoven fabric finally obtained is preferably 10 g / m ² or more and 100 g / m ² or less, particularly preferably 15 g / m ² or more and 80 g / m ² or less.

  As a material of the constituent members of the sanitary napkin 10 of the present embodiment, those used for this type of article can be used without particular limitation. For example, the surface sheet 1 includes those described above.

As the absorber 3, what is used for this kind of article can be arbitrarily adopted without any particular limitation. For example, the thing formed by coat | covering the absorptive core which consists of a hydrophilic fiber assembly with a core wrap sheet | seat etc. is mentioned. The absorbent core may further contain a superabsorbent polymer. Examples of the material for the core wrap sheet include paper and pulp sheets manufactured using hydrophilic fibers as raw materials, and hydrophilic nonwoven fabrics.
Further, the absorbent body 3 may be a sheet. Examples of the sheet-like material include paper and pulp sheets manufactured using hydrophilic fibers as raw materials. Further, a water absorbent sheet (for example, a water absorbent described in JP-A-8-246395) in which an absorbent core made of an aggregate of superabsorbent polymer materials is sandwiched between two base sheets (absorbent paper or non-woven fabric). And a polymer sheet described in JP-A No. 2004-275225).
The fibers of the fiber assembly and the hydrophilic fibers include, for example, natural fibers such as wood pulp and plant pulp such as softwood pulp and hardwood pulp, regenerated fibers such as cupra and rayon, semi-synthetic fibers such as acetate, polyolefins, Examples thereof include synthetic fibers such as polyamides and polyesters, and one of these can be used alone or two or more of them can be used in combination.

  The topsheet 1 is liquid permeable, and those used for this type of article can be used without any particular limitation. A hydrophilic thermal bond nonwoven fabric is preferable, and an air-through nonwoven fabric is particularly preferable from the viewpoint of promptly absorbing the excreted body fluid and transmitting it to the absorbent body and the good touch. It is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

  As a material for the back sheet 2, a moisture permeable film alone, a laminate of a film and a non-woven fabric, or a water-repellent non-woven fabric (such as SMS or SMMS) can be used. It is most preferable to use a moisture permeable film alone as a leak-proof material from the viewpoint of cost and matching with an anti-displacement adhesive. As the film material in this case, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler that is not compatible with the thermoplastic resin and extruding the film to a predetermined size to make fine holes, or essentially moisture The non-porous film which is highly compatible and can discharge water vapor, such as a permeable membrane.

  As the side sheet 4, for example, a spunbond-meltblown-spunbond laminated non-woven fabric (SMS non-woven fabric), a spunbond-meltblown-meltblown-spunbond non-woven fabric (SMMS non-woven fabric) and the like, a water-repellent non-woven fabric with high water resistance, and a spunbond non-woven fabric And a laminate of a nonwoven fabric such as a spunbond nonwoven fabric and a moisture permeable or moisture permeable resin film.

  As long as the sanitary napkin 10 of this embodiment has the liquid film cleaving agent containing part 6 and the non-containing part 11 in the topsheet 1 as described above, other member configurations and shapes are particularly limited as described above. Not. For example, the absorbent article of the present invention may be a combination of grooves separated into a plurality of leak-proof grooves 5 instead of annular. Further, the rear portion R may have a rear flap portion that extends long so as to cover the wearer's buttocks, or may have a second sheet between the topsheet 1 and the absorbent body 3. Good. Moreover, you may have the adhesion part fixed to underwear in the non-skin contact surface side of the back surface sheet 2, and also there may be a peeling sheet etc. which covers this adhesion part so that peeling is possible. In the sanitary napkin 10 of the present embodiment, the liquid film cleaving agent may be further contained in another member in addition to the top sheet 1.

  The absorbent article of the present invention is not limited to the above-described sanitary napkin as long as it has a surface sheet containing a liquid film cleaving agent, and may be various ones that absorb and retain excretory fluid. For example, it may be a panty liner, an incontinence pad, a diaper, a urine collection pad, or the like.

  This invention discloses the following absorbent articles further regarding embodiment mentioned above.

<1>
An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The said surface sheet is an absorbent article which has the containing part and non-containing part of a liquid film cleaving agent, and has the said containing part in the said excretion opening opposing part.

<2>
The absorbent article according to <1>, wherein the liquid film cleaving agent has a water solubility of 0 g or more and 0.025 g or less.

<3>
The absorbent article according to <1> or <2>, wherein the liquid film cleaving agent has an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.

<4>
An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The said surface sheet is an absorptive article which has the containing part and non-containing part of the following compound C1, and has the said containing part in the said excretion mouth opposing part.
[Compound C1]
A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.

<5>
<1> to <4, wherein the compound C1 or the liquid film cleaving agent comprises a compound having at least one structure selected from the group consisting of the following structures X, XY, and YXY. > Any one of>.
In structure X,> C (A)-<C represents a carbon atom. Moreover, <,>, and-show a bond. The same applies hereinafter. _{>, - C (A) 2} -, - C (A) (B) -,> C (A) -C (R 1) <,> C (R 1) -, - C (R 1) (R 2 )-, -C (R ¹ ) ₂ -,> C <, and -Si (R ¹ ) ₂ O-, -Si (R ¹ ) (R ² ) O- Or a siloxane chain having a structure in which two or more kinds are combined, or a mixed chain thereof. At the end of the structure X, a hydrogen atom, or -C (A) ₃ , -C (A) ₂ B, -C (A) (B) _2, -C (A) ₂ -C (R ¹ ) ₃ , -C (R ¹ ) ₂ A, -C (R ¹ ) ₃ , and -OSi (R ¹ ) ₃ , -OSi (R ¹ ) ₂ (R ² ), -Si (R ¹ ) ₃ , -Si (R ¹ ) _{2 It} has at least one group selected from the group consisting of (R ² ).
Each of R ¹ and R ² independently represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, or a halogen atom. A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom. When there are a plurality of R ¹ , R ² , A, and B in the structure X, they may be the same as or different from each other.
Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom. When Y is plural, they may be the same or different.

<6>
The compound C1 or the liquid film cleaving agent is composed of an organically modified silicone that is a silicone-based surfactant. As the organically modified silicone, amino-modified, epoxy-modified, carboxy-modified, diol-modified, carbinol-modified, (meth) acrylic. Modification, mercapto modification, phenol modification, polyether modification, methylstyryl modification, long chain alkyl modification, higher fatty acid ester modification, higher alkoxy modification, higher fatty acid modification and fluorine modification, including at least one selected from the group consisting of silicones <1>-<5> any one of the absorbent articles.

式中、Ｒ^３１は、アルキル基（炭素数１〜２０が好ましい。例えば、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、２エチル−ヘキシル基、ノニル基、デシル基が好ましい。）を示す。Ｒ^３２は、単結合又はアルキレン基（炭素数１〜２０が好ましい。例えば、メチレン基、エチレン基、プロピレン基、ブチレン基が好ましい。）を示し、好ましくは前記アルキレン基を示す。複数のＲ^３１、複数のＲ^３２は各々において、互いに同一でも異なってもよい。Ｍ^１１は、ポリオキシアルキレン基を有する基を示し、ポリオキシアルキレン基が好ましい。上記のポリオキシアルキレン基としては、ポリオキシエチレン基、ポリオキシプロピレン基、ポリオキシブチレン基、又はこれらの構成モノマーが共重合されたものなどが挙げられる。ｍ、ｎは各々独立に１以上の整数である。なお、これら繰り返し単位の符号は、各式［Ｉ］〜［ＩＶ］において別々に決められるものであり、必ずしも同じ整数を示すものではなく異なっていてもよい。 <7>
The compound C1 or the liquid film cleaving agent comprises a polyoxyalkylene-modified silicone, and the polyoxyalkylene-modified silicone is at least one selected from the group consisting of compounds represented by the following formulas [I] to [IV]. The absorbent article according to any one of <1> to <6>, wherein

In the formula, R ³¹ is an alkyl group (preferably having 1 to 20 carbon atoms. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2 ethyl-hexyl group, Nonyl group and decyl group are preferred). R ³² represents a single bond or an alkylene group (preferably having 1 to 20 carbon atoms, for example, a methylene group, an ethylene group, a propylene group or a butylene group is preferred), and preferably represents the alkylene group. The plurality of R ³¹ and the plurality of R ³² may be the same as or different from each other. M ¹¹ represents a group having a polyoxyalkylene group, and a polyoxyalkylene group is preferable. Examples of the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a copolymer of these constituent monomers. m and n are each independently an integer of 1 or more. In addition, the code | symbol of these repeating units is determined separately in each formula [I]-[IV], and does not necessarily show the same integer and may differ.

<8>
<1> or above, wherein the liquid film cleaving agent has an expansion coefficient greater than 0 mN / m for a liquid having a surface tension of 50 mN / m and an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m The absorbent article as described in <2>.

<9>
An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The said surface sheet is an absorbent article which has a containing part and non-containing part of the following compound C2, and has the said containing part in the said excretion opening | mouth opposing part.
[Compound C2]
A compound having a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and an interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less. .

<10>
<1> and <2>, wherein the compound C2 or the liquid film cleaving agent comprises a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY. <8> and <9> any one of an absorptive article.
The structure Z includes:> C (A)-<C: carbon atom>, -C (A) _2- , -C (A) (B)-,> C (A) -C (R ³ ) <,> C Any basic structure of (R ³ )-, -C (R ³ ) (R ⁴ )-, -C (R ³ ) ₂ -,> C <is repeated, or two or more types are combined Represents a hydrocarbon chain of structure. At the end of the structure Z, a hydrogen atom, _{or, -C (A) 3, -C} (A) 2 B, -C (A) (B) 2, -C (A) 2 -C (R 3) 3 , —C (R ³ ) ₂ A, and at least one group selected from the group consisting of —C (R ³ ) ₃ . When there are a plurality of R ³ , R ⁴ , A, and B in the structure Z, they may be the same as or different from each other.
R ³ and R ⁴ each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or a fluorine atom. A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom.
Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom. When Y is plural, they may be the same or different.

式中、Ｌ^２１は、エーテル基、アミノ基、アミド基、エステル基、カルボニル基、カーボネート基、ポリオキシエチレン基、ポリオキシプロピレン基、ポリオキシブチレン基、又はそれらを組み合わせたポリオキシアルキレン基、などの結合基を示す。Ｒ^５１は、水素原子、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、２−エチルヘキシル基、ノニル基、デシル基、メトキシ基、エトキシ基、フェニル基、フルオロアルキル基、アラルキル基、もしくはそれらを組み合わせた炭化水素基、又はフッ素原子からなる各種置換基を示す。また、ａ、ｂ、ｍ及びｎは各々独立に１以上の整数である。ここで、Ｃ_ｍＨ_ｎはアルキル基（ｎ＝２ｍ＋１）を表し、Ｃ_ａＨ_ｂはアルキレン基（ａ＝２ｂ）を表す。なお、これら炭素原子数および水素原子数は、各式［Ｖ］及び［ＶＩ］において各々独立に決められるものであり、必ずしも同じ整数を示すものではなく異なっていてもよい。なお、−（Ｃ_ａＨ_ｂＯ）_ｍ−の「ｍ」は、１以上の整数である。この繰り返し単位の値は、各式［Ｖ］及び［ＶＩ］において各々独立に決められるものであり、必ずしも同じ整数を示すものではなく異なっていてもよい。 <11>
The compound C2 or the liquid film cleaving agent is a polyoxyalkylene alkyl (POA) ether represented by any one of the following formula [V] and a polyoxyalkylene alkyl (POA) ether represented by the following formula [VI] having a mass average molecular weight of 1000 or more. <1>, <2> and <8> to <10> comprising at least one compound selected from the group consisting of oxyalkylene glycol, steareth, behenez, PPG myristyl ether, PPG stearyl ether and PPG behenyl ether. The absorbent article according to any one of the above.

In the formula, L ²¹ represents an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them, A linking group such as R ⁵¹ is a hydrogen atom, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, nonyl group, decyl group, methoxy group, ethoxy group, phenyl group , A fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a fluorine atom. A, b, m and n are each independently an integer of 1 or more. Here, C _m H _n represents an alkyl group (n = 2m + 1), and C _a H _b represents an alkylene group (a = 2b). The number of carbon atoms and the number of hydrogen atoms are determined independently in each of the formulas [V] and [VI], and may not necessarily represent the same integer and may be different. In addition, “m” in — (C _a H _b O) _m — is an integer of 1 or more. The value of this repeating unit is determined independently in each of the formulas [V] and [VI], and does not necessarily indicate the same integer, and may be different.

式［ＶＩＩ］中、ｍ及びｎは各々独立に１以上の整数である。ここで、Ｃ_ｍＨ_ｎは、上記各脂肪酸の炭化水素基を示す。

式［ＶＩＩＩ−Ｉ］及び［ＶＩＩＩ−ＩＩ］中、ｍ、ｍ’、ｍ’’、ｎ、ｎ’及びｎ’’は各々独立に１以上の整数である。複数のｍ、複数のｎは各々において、互いに同一でも異なっていてもよい。ここで、Ｃ_ｍＨ_ｎ、Ｃ_ｍ’Ｈ_ｎ’及びＣ_ｍ’’Ｈ_ｎ’’は、それぞれ、上記各脂肪酸の炭化水素基を示す。

式［ＩＸ］中、ｍ及びｎは各々独立に１以上の整数である。複数のｍ、複数のｎは各々において、互いに同一でも異なっていてもよい。ここで、Ｃ_ｍＨ_ｎは、上記各脂肪酸の炭化水素基を示す。

式［Ｘ］中、Ｒ^５２は、炭素原子数２以上２２以下の、直鎖又は分岐鎖、飽和又は不飽和の炭化水素基（アルキル基、アルケニル基、アルキニル基等）を示す。具体的には、２−エチルヘキシル基、ラウリル基、ミリスチル基、パルミチル基、ステアリル基、ベヘニル基、オレイル基、リノール基などが挙げられる。

式［ＸＩ］中、ｍ及びｎは各々独立に１以上の整数である。複数のｍ、複数のｎは各々において、互いに同一でも異なっていてもよい。ここで、Ｃ_ｍＨ_ｎは、上記各脂肪酸の炭化水素基を示す。

式［ＸＩＩＩ］中、ｍ及びｎは各々独立に１以上の整数である。ここで、Ｃ_ｍＨ_ｎは、上記各アルコールの炭化水素基を示す。

式［ＸＩＶ］中、ｍ及びｎは各々独立に１以上の整数である。ここで、２つのＣ_ｍＨ_ｎは、同一でも異なっていてもよい。Ｃ_ｍＨ_ｎ−ＣＯＯ−のＣ_ｍＨ_ｎは上記各脂肪酸の炭化水素基を示す。−ＣＯＯＣ_ｍＨ_ｎのＣ_ｍＨ_ｎはエステルを形成するアルコール由来の炭化水素基を示す。

式［ＸＶ］中、ｍ及びｎは各々独立に１以上の整数である。 <12>
The compound C2 or the liquid film cleaving agent is a fatty acid represented by the following formula [VII], a glycerin fatty acid ester and a pentaerythritol fatty acid ester represented by the following formula [VIII-I] or [VIII-II], A partially esterified product of glycerin fatty acid ester, sorbitan fatty acid ester, and pentaerythritol fatty acid ester represented by any one of [IX], any of the following formula [X], or any of the following formula [XI], [XII] a compound having a sterol structure, an alcohol represented by the following formula [XIII], a fatty acid ester represented by the following formula [XIV], and a wax represented by the following formula [XV]. The absorption according to any one of <1>, <2>, and <8> to <10>, comprising at least one kind. Sex articles.

In formula [VII], m and n are each independently an integer of 1 or more. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

In the formulas [VIII-I] and [VIII-II], m, m ′, m ″, n, n ′ and n ″ are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _{Here, C m H n, C m} 'H n' and _{C m ''} H _n '' are each a hydrocarbon group of each of the fatty acid.

In the formula [IX], m and n are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

In the formula [X], R ⁵² represents a linear or branched, saturated or unsaturated hydrocarbon group (an alkyl group, an alkenyl group, an alkynyl group, etc.) having 2 to 22 carbon atoms. Specific examples include 2-ethylhexyl group, lauryl group, myristyl group, palmityl group, stearyl group, behenyl group, oleyl group, linole group and the like.

In formula [XI], m and n are each independently an integer of 1 or more. The plurality of m and the plurality of n may be the same as or different from each other. _Here, C m _{H n} is a hydrocarbon group of each of the above fatty acids.

In formula [XIII], m and n are each independently an integer of 1 or more. _Here, C m _{H n} is a hydrocarbon group of each of the above alcohol.

In the formula [XIV], m and n are each independently an integer of 1 or more. Here, two C _m H _n may be the same or different. C _m H _n -COO- of _C m _{H n} is a hydrocarbon group of each of the above fatty acids. _C m _{H n} of -COOC _m H _n is a hydrocarbon group derived from the alcohol to form an ester.

In formula [XV], m and n are each independently an integer of 1 or more.

<13>
The viscosity of the compound C1, the compound C2, or the liquid film cleaving agent is 0 cps or more, preferably 10,000 cps or less, more preferably 1000 cps or less, and further preferably 200 cps or less, any one of the above items <1> to <12> 2. The absorbent article according to 1.

<14>
Any one of said <1>-<13> which is a part formed by pressing the said thickness recessed part from the skin contact surface side of the said surface sheet into the said absorber in the thickness direction of the said absorbent article. Absorbent article as described in 1.

<15>
The absorbent article according to any one of <1> to <14>, wherein the topsheet has the containing part and a non-containing part in the excretory fluid diffusion region.
<16>
The area ratio of the containing part in the excretory fluid diffusion region is 5% or more and 50% or less, preferably 10% or more, more preferably 20% or more, and preferably 40% or less, more preferably 30% or less. The absorbent article according to <15>.
<17>
The area ratio of the said containing part in the said excretion liquid diffusion area | region is an absorbent article as described in said <15> which is 20% or more and 30% or less.
<18>
The said surface sheet has the said non-containing part with the said containing part in the said excretion mouth opposing part, The area ratio of the said containing part in the said excretion mouth opposing part is 50% or more <1>-<17>. The absorbent article according to any one of the above.
<19>
The area ratio of the containing part in the excretory mouth facing part is 50% or more and less than 100%, preferably 60% or more, more preferably 70% or more, and preferably 95% or less, more preferably 90% or less. The absorbent article as described in <18>.
<20>
The area ratio of the containing part in the said excretion mouth opposing part is an absorbent article as described in said <18> which is 70% or more and 90%.
<21>
The topsheet has the containing part and the non-containing part in the excretory fluid diffusion region,
The absorbent article according to any one of <1> to <20>, wherein an area ratio of the containing part in the excretory liquid diffusion region is lower than an area ratio of the containing part in the excretory opening facing part.
<22>
The absorbent article according to any one of <1> to <21>, wherein the area ratio of the containing portion in the thickness recess is more preferably 40% or less, still more preferably 20% or less, and particularly preferably 0%.
<23>
The absorbent article according to any one of <1> to <22>, wherein the thickness recess is the non-containing part.
<24>
The absorbent article according to <23>, wherein the non-containing portion in the excretory fluid diffusion region is disposed adjacent to the thickness recess.

<25>
In the region where the containing part and the non-containing part are mixed and arranged in the surface sheet, when a virtual line along the width direction is arbitrarily drawn, the length of the containing part on the virtual line is not included. The absorbent article according to any one of <1> to <24>, which is shorter than the length of the part.
<26>
The ratio (S2 / S1) of the length (S2) of the containing part on the imaginary line to the length (S1) of the non-containing part is 1/19 or more and 1/1 or less, and preferably 2/3 or less. 3/7 or less is more preferable, 1/9 or more is preferable and 1/4 or more is more preferable The absorbent article as described in said <25>.
<27>
The ratio (S2 / S1) of the length (S2) of the containing part on the imaginary line to the length (S1) of the non-containing part is ¼ or more and 3/7 or less, according to <25>. Absorbent article.

<28>
The difference between the contact angle of the constituent fibers of the containing part and the contact angle of the constituent fibers of the non-containing part is 5 degrees or more and 60 degrees or less, preferably 10 degrees or more, more preferably 20 degrees or more, and 50 degrees The absorbent article according to any one of the above items <1> to <27>, wherein the following is preferable and 40 degrees or less is more preferable.
<29>
The difference between the contact angle of the constituent fibers of the containing part and the contact angle of the constituent fibers of the non-containing part is 20 degrees or more and 40 degrees or less, and the absorbent article according to any one of <1> to <27>. .
<30>
Any one of the above items <1> to <29>, wherein the contact angle of the constituent fibers of the non-containing part is preferably 90 degrees or less, more preferably 80 degrees or less, and still more preferably 70 degrees or less. Or an absorbent article according to claim 1.
<31>
Any one of the above items <1> to <30>, wherein the contact angle of the constituent fibers of the containing part is preferably 110 degrees or less, more preferably 90 degrees or less, and still more preferably 80 degrees or less. 2. The absorbent article according to 1.

<32>
The absorbent article according to any one of <1> to <31>, wherein the topsheet contains a phosphate ester type anionic surfactant.

<33>
The absorbent article according to any one of <1> to <32>, wherein the compound or the liquid film cleaving agent is localized near at least some of the fiber entanglement points or fiber fusion points.

<34>
The absorbent article according to any one of <1> to <33>, wherein the absorbent article is a sanitary napkin.

  EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is limited to this and is not interpreted. In the examples, “part” and “%” are based on mass unless otherwise specified. The expansion coefficient, interfacial tension, surface tension, and water solubility were measured in the environmental region at a temperature of 25 ° C. and a relative humidity (RH) of 65% as described above. In the following examples, the surface tension, water solubility, and interfacial tension of the liquid film cleaving agent were measured by the measurement methods described above. In the table below, “-” means that the agent indicated in the item name is not used, does not have a value corresponding to the item, and the like.

Example 1
The uneven raw material nonwoven fabric shown in FIG. 9 was produced by the method described above. Non-heat-shrinkable heat-bonded fibers with a fineness of 1.2 dtex are used for the upper layer (layer on the first surface 1A side), and heat-shrinkable fibers with a fineness of 2.3 dtex are used for the lower layer (layer on the second surface 1B side). Using. At this time, the distance between fibers in the upper layer was 80 μm, and the distance between fibers in the lower layer was 60 μm. Moreover, the fiber diameter of the said nonwoven fabric was 11 micrometers, and the basic weight was 74 g / m < ² >.
From the surface of the uneven structure of the raw material nonwoven fabric, polyoxyethylene (POE) -modified dimethyl silicone (KF-6015 manufactured by Shin-Etsu Chemical Co., Ltd.), and X in the structure XY is —Si (CH ₃ ) ₂ O— A dimethyl silicone chain, Y is a POE chain composed of-(C ₂ H ₄ O)-, the terminal group of the POE chain is a methyl group (CH ₃ ), the modification rate is 20%, and the polyoxyethylene addition mole number 4 shows the arrangement of the containing part 6 and the non-containing part 7 in the area corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 by flexographic printing of a liquid film cleaving agent having a mass average molecular weight of 4000. Coating was performed so as to obtain a pattern obtained by rotating the lattice shown in (B) by 90 degrees. Thereby, the area ratio ({sum of the total area of the containing part / the total area of the containing part and the non-containing part} × 100) of the containing part 6 in each of the excretory opening facing part 11 and the excretory liquid diffusion region 12 was set to 25%. . A liquid film cleaving agent was not applied to the region to be the thickness recessed portion 8, and the portion 7 was not included. Further, the non-contained portion 7 of the excretory fluid diffusion region 12 is arranged so as not to be adjacent to the region that becomes the thickness concave portion 8. At this time, the content rate (OPU) with respect to the fiber mass of the whole nonwoven fabric of a liquid film cleaving agent was 0.4 mass%. The nonwoven fabric after coating was used as the nonwoven fabric sample for the topsheet of Example 1.
The viscosity of the liquid film cleaving agent itself was 163 cps as a result of measurement by the method described above (Method for measuring the viscosity of a liquid cleaving agent).
The liquid film cleaving agent had a surface tension of 21.0 mN / m and a water solubility of less than 0.0001 g. The expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 28.8 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 0.2 mN / m. . These numerical values were measured by the measurement method described above. At that time, “a liquid having a surface tension of 50 mN / m” is obtained by adding polyoxyethylene sorbitan monolaurate, which is a nonionic surfactant, to 100 g of deionized water (trade name: Leool Super TW-L120 manufactured by Kao Corporation). Was added with a micropipette (ACURA825, manufactured by Socorex Isba SA), and a solution having a surface tension adjusted to 50 ± 1 mN / m was used. The water solubility was measured by adding an agent every 0.0001 g. As a result, what was observed as not dissolving 0.0001 g was defined as “less than 0.0001 g”, 0.0001 g was dissolved, and 0.0002 g observed as not dissolved was defined as “0.0001 g”. The other numerical values were also measured by the same method.

(Example 2)
The arrangement of the containing part 6 and the non-containing part 7 in the areas corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 is a stripe pattern shown in FIG. A nonwoven fabric sample for a topsheet of Example 2 was prepared in the same manner as in Example 1 except that the area ratio of the liquid film cleaving agent containing part 6 in each of 12 was as shown in Table 1.

(Example 3)
The arrangement of the containing part 6 in each area corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 is a dot pattern as shown in the excretion opening facing part 11 of FIG. A nonwoven fabric sample for the topsheet of Example 3 was prepared in the same manner as in Example 1 except that the area ratio of the liquid film cleaving agent containing part 6 in each region 12 was as shown in Table 1.

Example 4
Example 4 was performed in the same manner as Example 2 except that the area ratio of the liquid film cleaving agent containing part 6 in each region corresponding to the excretion opening facing part 11 and the excretion liquid diffusion area 12 was as shown in Table 1. A nonwoven fabric sample for the top sheet was prepared.

(Example 5)
The area ratio of the containing part 6 of the liquid film cleaving agent in each region corresponding to the excretory opening facing part 11 and the excretory fluid diffusion region 12 is as shown in Table 1, and a part of the non-contained part 7 of the excretory fluid diffusion region 12 A nonwoven fabric sample for a top sheet of Example 5 was prepared in the same manner as in Example 3 except that it was arranged adjacent to the region to be the thickness recess 8.

(Example 6)
The entire region corresponding to the excretion mouth facing portion 11 is only the containing portion 6, and the arrangement of the containing portion 6 in the region corresponding to the excretory fluid diffusion region 12 is a pattern obtained by rotating the lattice shown in FIG. The surface sheet of Example 6 was used in the same manner as in Example 5 except that the area ratio of the liquid film cleaving agent containing part 6 in each of the excretory opening facing part 11 and the excretory liquid diffusion region 12 was as shown in Table 1. A nonwoven fabric sample was prepared.

(Example 7)
Epoxy-modified dimethyl silicone (KF-101, manufactured by Shin-Etsu Chemical Co., Ltd.) as a liquid film cleaving agent, X in structure XY is a dimethyl silicone chain composed of —Si (CH ₃ ) ₂ O—, Y is — (RC ₂ H ₃ O) — an epoxy group comprising a surface sheet of Example 7 in the same manner as in Example 6 except that a modification rate of 32% and a mass average molecular weight of 35800 were used. A nonwoven fabric sample was prepared.
The viscosity of the liquid film cleaving agent itself was 1515 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
The liquid film cleaving agent had a surface tension of 21.0 mN / m and a water solubility of less than 0.0001 g. The expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 26.0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 3.0 mN / m. These numerical values were measured by the same method as in Example 1.

(Example 8)
Tricaprylic acid / glycol caprate (Coconard MT manufactured by Kao Corporation) as a liquid film cleaving agent, and Z in the structure ZY is * —O—CH (CH ₂ O— *) ₂ (* represents a bonding part). Y is composed of a hydrocarbon chain of C ₈ H ₁₅ O— or C ₁₀ H ₁₉ O—, the fatty acid composition is composed of 82% caprylic acid and 18% capric acid, and the mass average molecular weight is 550. A non-woven fabric sample for a top sheet of Example 8 was produced in the same manner as Example 7 except that the above was used.
The viscosity of the liquid film cleaving agent itself was 24.1 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
The liquid film cleaving agent had a surface tension of 28.9 mN / m and a water solubility of less than 0.0001 g. The expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 8.8 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 12.3 mN / m. These numerical values were measured by the same method as in Example 1.

Example 9
A nonwoven fabric sample for the topsheet of Example 9 is prepared in the same manner as in Example 7 except that liquid isoparaffin (rubitol Lite, manufactured by BASF Japan Ltd.) having a mass average molecular weight of 450 is used as the liquid film cleaving agent. did.
The viscosity of the liquid film cleaving agent itself was 24.1 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
The liquid film cleaving agent had a surface tension of 27.0 mN / m and a water solubility of less than 0.0001 g. The expansion coefficient of the liquid film cleaving agent for a liquid with a surface tension of 50 mN / m was 14.5 mN / m, and the interfacial tension for a liquid with a surface tension of 50 mN / m was 8.5 mN / m. These numerical values were measured by the same method as in Example 1.

(Example 10)
A nonwoven fabric sample for a top sheet of Example 10 was produced in the same manner as in Example 2 except that the region to be the thickness recess 8 was changed to the containing part 6 of the liquid film cleaving agent.

(Example 11)
Polypropylene glycol (PPG) (anti-foaming agent No. 1 manufactured by Kao Corporation) as a liquid film cleaving agent, X in structure X is composed of POP chains, 52 number of moles of polyoxypropylene group, mass average molecular weight A nonwoven fabric sample for the top sheet of Example 13 was produced in the same manner as in Example 6 except that 3000 was used.
The viscosity of the liquid film cleaving agent itself was 470 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
The liquid film cleaving agent had a surface tension of 32.7 mN / m and a water solubility of less than 0.0001 g. The expansion coefficient of the liquid film cleaving agent for a liquid with a surface tension of 50 mN / m was 16.3 mN / m, and the interfacial tension for a liquid with a surface tension of 50 mN / m was 1.0 mN / m. These numerical values were measured by the same method as in Example 1.

(Comparative Example 1)
The raw material nonwoven fabric used in Example 1 before applying the liquid film cleaving agent was prepared as a nonwoven fabric sample of Comparative Example 1 as it was.

(Reference Example 1)
Example 10 is the same as Example 1 except that each of the areas corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 and the area that becomes the thickness recessed part 8 is the containing part 6 of the liquid film cleaving agent. A nonwoven fabric sample for the top sheet was prepared.

(Liquid remaining amount of non-woven fabric sample (surface sheet))
As an example of an absorbent article, a surface sheet is removed from a sanitary napkin (manufactured by Kao Corporation: Laurier F, happy bare skin 30 cm, made in 2014), and a nonwoven fabric sample (hereinafter referred to as a nonwoven fabric sample) is used instead. A sanitary napkin for evaluation obtained by laminating so that the surface of the concavo-convex structure is on the skin contact surface side, fixing the periphery thereof, and further forming the thickness concave portion 8 shown in FIG. Produced.
An acrylic plate having a transmission hole with an inner diameter of 1 cm was overlaid on the surface of each evaluation sanitary napkin, and a constant load of 100 Pa was applied to the napkin. Under such a load, 6.0 g of pseudo blood corresponding to menstrual blood (adjusted equine defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd. to 8.0 cP) was poured from the perforation hole of the acrylic plate. The equine defibrinated blood used was adjusted with a TVB10 viscometer manufactured by Toki Sangyo Co., Ltd. under the condition of 30 rpm. When the equine defibrinated blood is allowed to stand, a highly viscous portion (such as red blood cells) precipitates, and a low viscosity portion (plasma) remains as a supernatant. The mixing ratio of the part was adjusted to 8.0 cP. The acrylic plate is removed 60 seconds after a total of 6.0 g of simulated blood has been poured. Next, the weight (W2) of the nonwoven fabric sample was measured, and the difference (W2−W1) from the weight (W1) of the nonwoven fabric sample before flowing the simulated blood, which had been measured in advance, was calculated. The above operation was performed 3 times, and the average value of the 3 times was defined as the remaining liquid amount (mg). The liquid remaining amount is an index of how much the wearer's skin gets wet. The smaller the liquid remaining amount, the better the result.

(Length of liquid flow in the longitudinal direction of the nonwoven fabric surface)
As the test apparatus, a test apparatus having a mounting portion in which the mounting surface of the test sample is inclined by 45 ° with respect to the horizontal plane was used. A sanitary napkin for evaluation using each sample as a top sheet was placed on the mounting portion with the top sheet facing upward and the vertical direction of the sanitary napkin being an inclined direction. The sanitary napkin for evaluation was prepared by the same method as the measurement of the remaining liquid amount of the top sheet (nonwoven fabric sample). On the surface of each evaluation sanitary napkin, 0.5 g of pseudo blood (adjusted to 8.0 cP of equine defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd.) was dropped at a rate of 0.1 g / sec. I let you. The distance from the point where the liquid was first applied to the nonwoven fabric to the point where the test liquid was drawn into the nonwoven fabric and stopped flowing was measured. In addition, the pseudo blood used was adjusted by the method similar to the measurement of the liquid remaining amount of the said surface sheet (nonwoven fabric sample). The above operation was performed three times, and the average value of the three times was defined as the liquid flow length (mm) in the vertical direction. The length of the liquid flow in the vertical direction is an indicator of how easily the liquid flows on the surface without being absorbed by the test sample and is more likely to leak during installation.The shorter the liquid flow length in the vertical direction, the higher the liquid flow length. It becomes evaluation.
(Liquid flow length in the width direction of the nonwoven fabric surface)
As a test apparatus, a sanitary napkin for evaluation using each sample as a top sheet is used, with the top surface of the test sample placed on the upper side. The direction and the width direction of the sanitary napkin were measured in the same manner as the liquid flow length in the longitudinal direction of the nonwoven fabric surface, except that the direction of inclination was the inclination direction. The average of the three measurements was taken as the liquid flow length (mm) in the width direction. The liquid flow length in the width direction is an index of how easily the liquid flows on the surface without being absorbed by the test sample and is likely to leak in the width direction of the wearer during wearing. The shorter the length, the higher the rating.

(Macro extension distance of liquid film cleaving agent)
The macro expandability of the liquid film cleaving agent can be evaluated by the macro expansion distance of the liquid film cleaving agent.
Separately from the above test, the macro expansion distance of each liquid film cleaving agent used in Examples 1, 7, 8, and 9 was measured by the following method.
Each liquid film cleaving agent used in Examples 1, 7, 8 and 9 was colored, and each colored liquid film cleaving agent was attached to the top of the convex part of the uneven nonwoven fabric of FIG. A sanitary napkin for evaluation was prepared in the same manner as described above (the amount of remaining liquid on the topsheet) except that a dot-shaped containing portion was formed. The basis weight of the liquid film cleaving agent at this time was 25.9 g / m ² .
An acrylic plate having a permeation hole with an inner diameter of 1 cm is overlaid on the surface of the sanitary napkin for evaluation, and a constant load of 100 Pa is applied to the napkin. The equine defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd. was adjusted to 8.0 cP) 6.0 g twice and was allowed to stand for 60 seconds.
Next, the region where the liquid film cleaving agent was diffused was measured as a distance in 8 directions from the center of the dot-shaped containing part, and the average value was taken as the macro extended distance of the liquid film cleaving agent.

  The composition of the above Examples and Comparative Examples, and the results of each evaluation for the Examples and Comparative Examples are shown in Tables 1 and 2 below. The measurement results of (macro extension distance of the liquid film cleaving agent) are as shown in Table 3 below.

As shown in Tables 1 and 2 above, in Comparative Example 1 having no liquid film cleaving agent content, the liquid remaining amount was 233 g.
On the other hand, in Examples 1 to 11, the liquid remaining amount is reduced to about half or less of Comparative Example 1 by having the liquid membrane cleaving agent-containing part in the excretion opening facing part that directly receives excretion liquid. Effective cleavage of the liquid film was confirmed. That is, Examples 1 to 11 had a high liquid residue reduction effect.
In addition, in Reference Example 1 in which the liquid film cleaving agent was incorporated in the entire surface sheet, there was room for improvement in the liquid flow length in the longitudinal direction and the width direction of the nonwoven fabric surface, although reduction of the liquid residue was observed. .
On the other hand, in Examples 1-11, since the containing part and non-containing part of the liquid film cleaving agent were mixed and arranged at a predetermined ratio in the excretory liquid diffusion region surrounding the excretory opening facing part, the vertical direction of the surface sheet surface In addition, the liquid flow length in the width direction was suppressed more than that of Reference Example 1, and the leakage prevention property was higher than that of Reference Example 1.
As described above, Examples 1 to 11 achieved both improvement in liquid residue reduction and improvement in leakage prevention.

In Examples 1-6, the liquid residue reduction effect is so high that the area ratio of the containing part in an excretion mouth opposing part is high, and the liquid residue reduction effect is high especially in the said area ratio 50% or more (Examples 3-6). It was. Moreover, in Examples 1-6, the liquid flow length of the vertical direction of the surface sheet surface and the width direction is short, so that the area ratio of the containing part of a excretion liquid diffusion area | region is low (the area ratio of a non-containing part is high). It was suppressed.
In Examples 2 and 10, which differ only in the presence or absence of a liquid film cleaving agent in the thickness recess, Example 10 which does not contain a liquid film cleaving agent in the thickness recess contains Example 10 containing a liquid film cleaving agent in the thickness recess. As a result, the liquid flow length in the width direction was suppressed. That is, it was found that the liquid flow blocking function due to the thickness concave portion was sufficiently exhibited without being inhibited by the liquid film cleaving agent, and the leakage prevention property of the napkin sample was enhanced.
Next, in Examples 3 and 5 which differ only in the arrangement relationship between the thickness recess not containing the liquid film cleaving agent and the non-contained portion of the excretory fluid diffusion region, the thickness concavity and the non-contained portion of the excretory fluid diffusion region are The liquid flow length in the width direction was suppressed to be shorter in the adjacent example 5 than in the non-adjacent example 3. That is, it turned out that the thickness recessed part which does not contain a liquid film cleaving agent, and the non-contained part of the excretory liquid diffusion region cooperate to block the liquid flow and enhance the leakage prevention property of the napkin sample.

  In addition, as shown in the test results of (macro extended distance of liquid film cleaving agent) shown in Table 3 above, each liquid film cleaving agent used in Examples 1 to 10 has a dot-shaped content part having a diameter of 0.8 mm. It was confirmed that it extends to the non-contained part beyond. Thereby, in Examples 1-10, even if it has the area | region where a containing part and a non-containing part are mixedly arranged in an excretion mouth opposing part and an excretion liquid diffusion area | region, a liquid residue reduction effect is equivalent to the reference example 1. It was demonstrated at the level.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 4 Side sheet 5 Wing part 6 Containing part 7 Non-contained part 8 Thickness recessed part 10 Sanitary napkin 11 Excretion opening facing part 12 Excretion liquid diffusion region 18 Containing part of liquid film cleaving agent and non-containment Region 81 in which the portion is mixed and arranged Fiber 82 Liquid film 83 Liquid film cleaving agent 100 Uneven uneven nonwoven fabric

Claims (11)

An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The top sheet has a containing part and a non-containing part of one or a plurality of compounds selected from the following compound C1 and the following compound C2 , and the top sheet has the excretory opening facing part and the excretory liquid. Having the containing part in the diffusion region ,
In the liquid diffusion region on the surface of the surface sheet, at least one of the containing part and the non-containing part is separated into a plurality, the containing part and the non-containing part are adjacent to each other, or one direction on the surface or They are alternately arranged in a plurality of directions, to the area of the liquid waste diffusion region, the area ratio of the containing portion in said liquid waste diffusion region Ru der 5% or more and 30% or less, the absorbent article.
[Compound C1]
A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
[Compound C2]
A compound whose water solubility is 0 g or more and 0.025 g or less, the expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing part and a non-containing part of one or a plurality of compounds selected from the following compound C1 and the following compound C2 , and the topsheet has the containing part at the excretory opening facing part. Yes, and the area ratio of the content portion in the thickness recess of the topsheet Ru der than 20%, the absorbent article.
[Compound C1]
A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
[Compound C2]
A compound whose water solubility is 0 g or more and 0.025 g or less, the expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing part and a non-containing part of one or a plurality of compounds selected from the following compound C1 and the following compound C2 , and the topsheet has the containing part at the excretory opening facing part. have a fiber distance between said topsheet Ru der less 90 [mu] m, the absorbent article.
[Compound C1]
A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
[Compound C2]
A compound whose water solubility is 0 g or more and 0.025 g or less, the expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing portion and a free portion of the following compounds C1 -1, and wherein the surface sheet has the containing portion in the excretion portion facing section, the absorbent article.
[Compound C1-1 ]
Water solubility is less 0.025g than 0 g, expansion factor to the liquid surface tension 50 mN / m is Ri der than 20 mN / m, the compound viscosity of Ru der less 200 cps. An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing portion and a free portion below EkimakuHiraki cleaving agent, and wherein the surface sheet has the containing portion in the excretion portion facing section and said liquid waste diffusion region,
In the liquid diffusion region on the surface of the surface sheet, at least one of the containing part and the non-containing part is separated into a plurality, the containing part and the non-containing part are adjacent to each other, or one direction on the surface or They are alternately arranged in a plurality of directions, to the area of the liquid waste diffusion region, the area ratio of the containing portion in said liquid waste diffusion region Ru der 5% or more and 30% or less, the absorbent article.
Liquid film cleaving agent: a compound having a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m of 15 mN / m or more, and a water solubility of 0 g or more and 0.025 g or less, Agent having one or more compounds selected from compounds having an expansion coefficient of greater than 0 mN / m for a liquid having a surface tension of 50 mN / m and an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing portion and a free portion below EkimakuHiraki cleaving agent, and a surface sheet, possess the containing portion in the excretion portion facing section, the thickness recess of the topsheet the area ratio of the content portion is Ru der than 20%, the absorbent article in.
Liquid film cleaving agent: a compound having a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m of 15 mN / m or more, and a water solubility of 0 g or more and 0.025 g or less, Agent having one or more compounds selected from compounds having an expansion coefficient of greater than 0 mN / m for a liquid having a surface tension of 50 mN / m and an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The topsheet has a containing portion and a free portion below EkimakuHiraki cleaving agent, and said topsheet, possess the containing portion in the excretion portion facing section, between the fibers of the topsheet distance is Ru der less than 90μm, the absorbent article.
Liquid film cleaving agent: a compound having a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m of 15 mN / m or more, and a water solubility of 0 g or more and 0.025 g or less, Agent having one or more compounds selected from compounds having an expansion coefficient of greater than 0 mN / m for a liquid having a surface tension of 50 mN / m and an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m . An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
The absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion,
The surface sheet has a water solubility of 0 g or more and 0.025 g or less, an expansion coefficient for a liquid having a surface tension of 50 mN / m is 20 mN / m or more, and a viscosity of 200 cps or less. The absorbent article has a containing part, and the topsheet has the containing part at the excretory opening facing part. The topsheet has the containing part and the non-containing part in the excretory fluid diffusion region,
The absorbent article according to any one of claims 1 to 8, wherein an area ratio of the containing part in the excretory liquid diffusion region is lower than an area ratio of the containing part in the excretory opening facing part.   The absorptive article given in any 1 paragraph of Claims 1-9 in which said thickness crevice is made into said non-containing part. The absorptive article according to claim 10 in which said non-contained part in said excretory fluid diffusion field is arranged adjacent to said thickness crevice.

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