WO2017209008A1 - Nonwoven fabric - Google Patents

Abstract

A nonwoven fabric, wherein a nonwoven fabric surface has inclusion sections that include a liquid film splitting agent, and non-inclusion sections that do not include the liquid film splitting agent, and when a square with a 5mm side is delineated on the nonwoven fabric surface on which the inclusion sections and the non-inclusion sections are positioned, the nonwoven fabric surface has one or more interfaces between the inclusion sections and the non-inclusion sections within the area of the square.

Description

Non-woven

The present invention relates to a nonwoven fabric.

In recent years, techniques for enhancing the wearer's feeling of wear, such as dryness, have been proposed for nonwoven fabrics used for surface sheets that touch the skin of absorbent articles.
For example, Patent Document 1 describes that a non-woven fabric forming a skin contact sheet of an absorbent article contains a skin care agent from the viewpoint of suppressing skin fog. The skin care agent is included in the protruding portion more than the recessed portion of the nonwoven fabric to improve the contact property to the skin.
Patent Document 2 describes that a water repellent part is provided at a predetermined ratio from the viewpoint of improving liquid absorbency while suppressing wetback on the top sheet of an absorbent article.
Patent Document 3 describes that in an diaper or the like, lotion coating is applied to the outer surface of a top sheet that touches the skin in order to prevent stool from adhering to the wearer's skin.

JP 2012-55409 A JP 2011-189065 A JP 2010-75733 A

The present invention provides a nonwoven fabric surface in which the nonwoven fabric surface has a containing part containing a liquid film cleaving agent and a non-containing part not containing the liquid film cleaving agent, and the containing part and the non-containing part are arranged. When a square with a side of 5 mm is partitioned, a nonwoven fabric having one or more interfaces between the containing part and the non-containing part in the square region is provided.
Further, the present invention provides a nonwoven fabric surface in which the nonwoven fabric surface has a containing part containing the following compound C1 and a non-containing part not containing the following compound C1, and the containing part and the non-containing part are arranged. On the other hand, when a square having a side of 5 mm is defined, a nonwoven fabric having one or more interfaces between the containing part and the non-containing part in the square region is provided.
[Compound C1]
A compound having an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
Further, the present invention provides a nonwoven fabric surface in which the nonwoven fabric surface has a containing part containing the following compound C2 and a non-containing part not containing the following compound C2, and the containing part and the non-containing part are arranged. On the other hand, when a square having a side of 5 mm is defined, a nonwoven fabric having one or more interfaces between the containing part and the non-containing part in the square region is provided.
[Compound C2]
A compound having 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 above and other features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings as appropriate.

It is a top view which shows preferable embodiment of the nonwoven fabric which concerns on this invention. In the nonwoven fabric shown in FIG. 1, it is the partial expanded plan view which divides and shows the square of 1 mm of 5 mm with respect to the nonwoven fabric surface where the containing part and the non-containing part are arrange | positioned, (A) contains the said outer periphery of the said square. The arrangement | positioning which does not overlap with the line of the interface of a part and a non-contained part is shown, (B) has shown the arrangement | positioning in which the said square outer periphery line partially overlaps with the line of the interface of a containing part and a non-contained part. (A) And (B) is a partially expanded plan view which shows the specific example of the preferable arrangement | positioning pattern of a containing part and a non-containing part. (C) And (D) is a partially expanded plan view which shows the specific example of the other preferable arrangement pattern of a containing part and a non-containing part. It is explanatory drawing which shows the state in which the droplet is corrugated within the square area | region in the surface of the nonwoven fabric shown in FIG. It is the partial notch top view of the sanitary napkin which showed the excretion opening | mouth contact | abutting part at the time of applying the nonwoven fabric which concerns on this invention as a surface sheet of a sanitary napkin. (A) is explanatory drawing which shows the sum total of the width | variety of the containing part of a nonwoven fabric shown in FIG. 1, the width | variety of a non-containing part, and the width | variety of a containing part and a non-containing part, (B) arranged the containing part as circular shape. In the aspect of the nonwoven fabric which concerns on this invention, it is explanatory drawing which shows the sum total of the width | variety of a containing part, the width | variety of a non-containing part, and the width | variety of a containing part and a non-containing part. It is a schematic diagram which shows the liquid film formed in the clearance gap between the fibers of a nonwoven fabric. (A1) to (A4) are explanatory views schematically showing from the side the state in which the liquid film cleaving agent according to the present invention cleaves the liquid film, and (B1) to (B4) are liquid crystals according to the present 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 a nonwoven fabric which shows the preferable aspect (1st embodiment) of the nonwoven fabric which concerns on this invention. It is a perspective view which shows typically another partial aspect (2nd embodiment) of the nonwoven fabric which concerns on this invention by making a partial cross section. FIG. 6 is a perspective view schematically showing still another preferred embodiment (third embodiment) of the nonwoven fabric according to the present invention with a partial cross section, wherein (A) shows a nonwoven fabric composed of one layer, and (B) shows two layers. The nonwoven fabric which consists of is shown. It is a perspective view which shows typically another preferable aspect (4th embodiment) of the nonwoven fabric which concerns on this invention. It is a perspective view which shows the modification of the nonwoven fabric shown in FIG. It is a perspective view which shows typically another preferable aspect (5th embodiment) of the nonwoven fabric which concerns on this invention. It is explanatory drawing which shows typically the state by which the constituent fibers of the nonwoven fabric shown in FIG. 14 were fixed in the heat-fusion part. It is a perspective view which shows typically another preferable aspect (6th embodiment) of the nonwoven fabric which concerns on this invention. It is a perspective view which shows typically another preferable aspect (7th embodiment) of the nonwoven fabric which concerns on this invention.

Detailed Description of the Invention

The present invention relates to a non-woven fabric having an improved liquid flow preventing property on the surface while reducing a liquid film formed between fibers of the non-woven fabric to achieve a higher level of liquid remaining reduction.

In the nonwoven fabric used for the surface sheet or the like, there is a region where the distance between the fibers is narrow. Even if there is a space in the area that can pass excretion fluid (eg, urine and menstrual blood, also simply called liquid), meniscus force between fibers, surface activity due to plasma proteins, and blood surface viscosity is high. Therefore, 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 as a result, there is still room for improvement in dryness.
Thus, there is a need 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 nonwoven fabric, appropriate hydrophilicity is required on the surface of the nonwoven fabric so that the liquid can easily enter between the fibers. If the hydrophilicity on the nonwoven fabric surface is too low, the liquid flow on the nonwoven fabric surface is likely to occur before the liquid enters between the fibers.

The non-woven fabric of the present invention can improve the liquid flow preventing property on the surface while reducing the liquid film formed between the fibers of the non-woven fabric to achieve a higher level of liquid remaining reduction.

As a preferred embodiment of the nonwoven fabric according to the present invention, for example, a nonwoven fabric 5 as shown in FIG. In addition, the nonwoven fabric of this invention can be applied to various articles | goods which concern on liquid absorption, for example, can be used as a surface sheet of absorbent articles, such as a sanitary napkin, a baby diaper, an adult diaper.

The nonwoven fabric 5 has a containing part 6 containing a liquid film cleaving agent and a non-containing part 7 not containing the liquid film cleaving agent on the nonwoven fabric surface. In the nonwoven fabric 5, the containing part 6 and the non-containing part 7 which are extended in a strip shape in the longitudinal direction (Y direction) are alternately arranged in the width direction (X direction) orthogonal to the longitudinal direction. That is, the containing part 6 and the non-containing part 7 form a stripe arrangement pattern. In addition, the extending direction of the containing part 6 and the non-containing part 7 is not limited to the longitudinal direction in the present embodiment, and may be the width direction.
The longitudinal direction is the direction in which the nonwoven fabric is relatively long as the name suggests, and when the nonwoven fabric is rolled as a raw fabric, or is unwound from a rolled state. Means the direction in which the nonwoven fabric is unwound. The width direction is a direction orthogonal to the longitudinal direction, and means the roll axis direction in the state of the original fabric. Moreover, when the orientation direction of the fiber which comprises a nonwoven fabric is known, it can be said that the orientation method of a fiber is a longitudinal direction. At this time, it can be said that the width direction is a direction perpendicular to the fiber orientation direction.
Moreover, the said longitudinal direction means a machine carrying-out direction (MD: Machine Direction) in the manufacturing stage of a nonwoven fabric. The said width direction means the width direction (CD: Cross Direction) orthogonal to a machine carrying-out direction in the manufacture stage of a nonwoven fabric.
Furthermore, when the nonwoven fabric is cut into a predetermined size to obtain a surface sheet of an absorbent article, the longitudinal direction of the nonwoven fabric is a direction that coincides with the longitudinal direction of the absorbent article. Therefore, it is preferable that the extending direction of the containing part 6 and the non-containing part 7 is arranged toward the longitudinal direction of the absorbent article as the longitudinal direction (Y direction) from the viewpoint of preventing liquid leakage.

In the nonwoven fabric 5, when a square 8 having a side of 5 mm is defined on the nonwoven fabric surface on which the containing part 6 and the non-containing part 7 are arranged, the interface 9 between the containing part 6 and the non-containing part 7 in the area of the square 8. 1 or more. The “square of 5 mm on one side” here refers to the size of a droplet flowing on the surface of the nonwoven fabric or a droplet that leaks to the wearer's body when the napkin is worn. The “square of 5 mm per side” is arbitrarily arbitrarily divided with respect to the region of the nonwoven fabric surface where the containing part 6 and the non-containing part 7 are arranged.
Therefore, the nonwoven fabric 5 has one or more interfaces 9 between the containing part 6 and the non-containing part 7 for each square area when the square is arbitrarily divided into one or two or more on the surface. . At this time, the interface 9 means an inside of the square 8, and the linear interface 9 overlapping the outer peripheral line of the square 8 is not counted. For example, in the case of FIG. 2A, the number of interfaces 9 in the area inside the square 8 is determined to be 7. In the case of FIG. 2B, the number of the interfaces 9 in the area inside the square 8 is determined to be 6 without counting the interfaces 9 overlapping the outer periphery of the square 8.

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 FIG. 1, although the pattern is attached | subjected and shown to the containing part 6 for the understanding of the arrangement | positioning area | region and arrangement | positioning pattern of the containing part 6 and the non-containing part 7, it cannot necessarily be distinguished visually. The same applies to FIGS. 2 to 6 below).
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 blotting paper is applied to the surface of the nonwoven fabric 5, an acrylic plate having a thickness of 4 mm is placed, and a weight is applied for 30 seconds so as to be 600 g / cm ² from the top. 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 liquid film cleaving agent contained in the containing part 6 is a liquid film formed between the fibers of the nonwoven fabric or on the fiber surface when the liquid, for example, highly viscous liquid such as menstrual blood or excretion liquid such as urine touches the nonwoven fabric. 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 nonwoven fabric has excellent liquid permeability. Thereby, even if the fiber which comprises a nonwoven fabric 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. The liquid film disappearing effect can be exhibited. 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 it is in an easy state. 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 meets the above properties, a mixture of a plurality of single compounds that meet 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 WO2016 / 098796.

In the present invention, the content 6 of the nonwoven fabric containing or containing a liquid film cleaving agent mainly means that it is adhered 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 application 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 melt | dissolved the liquid film cleaving agent in the solvent if necessary, or the emulsified liquid and dispersion liquid of the liquid film cleaving agent. .
The liquid film cleaving agent according to the present invention needs to exist as a liquid when the liquid film cleaving agent touches body fluid in order to have the liquid film cleaving effect described later in the nonwoven fabric. 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 described later, the liquid film cleaving agent has a smaller surface tension than conventional hydrophilizing agents 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 enhance the lubricity of the liquid on the surface of the nonwoven fabric as compared with the case without the liquid film cleaving agent. In particular, when liquid is first received from a dry surface, the liquid tends to flow out. On the other hand, since the non-containing part 7 does not have a liquid film cleaving agent, the liquid does not flow out on the surface of the nonwoven fabric 5.

The nonwoven fabric 5 has at least one interface between the containing portion 6 and the non-containing portion 7 in a square region having a size corresponding to a droplet. Therefore, on the surface of the nonwoven fabric 5, at least one set of the containing part 6 containing the liquid film cleaving agent and the non-containing part 7 not containing the liquid film cleaving agent overlaps with one droplet. In such an overlap, the cleaving action of the liquid film in the containing part 6 and the liquid flow suppressing action by the non-containing part are simultaneously manifested with respect to the droplet. As a result, in the nonwoven fabric 5, while suppressing the liquid flow on the surface of the nonwoven fabric, the liquid film formed by entering between the fibers is cleaved to increase the liquid permeability in the thickness direction. Thereby, the surface flow preventive property of the liquid can be enhanced while achieving and maintaining a high liquid residue reduction of the nonwoven fabric 5.
In addition, the effect | action of a liquid film cleaving agent and the detail of a specific example are mentioned later.

The difference between the contact angle of the constituent fibers of the containing portion 6 and the contact angle of the constituent fibers of the non-containing portion 7 is that the outer periphery of the droplet on the containing portion 6 is easily constricted, that is, the outer periphery of the droplet 90 is corrugated. From the viewpoint of ease, 5 degrees or more is preferable, 10 degrees or more is more preferable, and 20 degrees or more is still more preferable. Further, the difference in the contact angle is preferably 70 degrees or less, more preferably 50 degrees or less, and further preferably 30 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 increases, 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 part of the nonwoven fabric, 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 ejected from an ink jet type water droplet ejection part (manufactured by Cluster Technology Co., Ltd., pulse injector CTC-25 having a pore diameter of 25 μm) is set to 20 picoliters, and a water droplet is dropped just 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.

The arrangement pattern of the containing part 6 and the non-containing part 7 is limited to that shown in FIG. 1 as long as the conditions of the above square 8 are satisfied and the liquid film cleaving action and the liquid surface flow suppressing action can be achieved at the same time. It can be various. For example, even in the same stripe arrangement pattern, the extending direction may be different from that in FIG. Specific examples thereof include a pattern shown in FIG. 3-1 (A) in which the bands of the containing portion 6 and the non-containing portion 7 extend in the X direction orthogonal to the Y direction.
Further, the containing parts 6 may be discontinuous and spaced apart from each other. At this time, the shape of the containing part 6 spaced apart from each other is not particularly limited, and various shapes such as a circle, a rectangle, and a broken line can be taken. A pattern in which the containing portions 6 having a predetermined shape are arranged apart from each other along the Y direction and the X direction may be used. That is, the arrangement | positioning pattern by which the containing part 6 made into the predetermined shape was spaced apart from each other along both the longitudinal direction and the width direction of a nonwoven fabric, and was distributedly arranged in the some direction may be sufficient. For example, as shown in FIG. 3-1 (B), a pattern in which the containing portions 6 made circular (dots) are arranged apart from each other along the Y direction and the X direction can be cited. In this case, the part adjacent to the containing part 6 becomes the non-containing part 7. In this pattern, the pitch between the containing portions 6 in the Y direction and the X direction may be the same or different. FIG. 3-1 (B) shows a pattern in which the pitch between the vertical and horizontal inclusions is constant. It is also possible to use an arrangement pattern in which the non-containing part 7 is formed in a predetermined shape and distributed in a plurality of directions instead of the containing part 6. In this case, the part adjacent to the non-containing part 7 becomes the containing part 6.
Moreover, the arrangement pattern which modeled the containing part 6 or the non-containing part 7 in the shape of various figures may be sufficient. For example, it is good also considering the inclusion part 6 as a wavy line, arranging a plurality, and making the space between the inclusion parts 6 into the non-containing part 7. The containing part 6 may be a plurality of ellipses having different sizes and arranged concentrically and spaced apart from each other. Also in this case, the space between the containing parts 6 becomes a non-containing part.
Furthermore, the containing part 6 or the non-containing part 7 may have a more complicated geometric shape. For example, as shown in FIG. 3-2 (C), the containing part 6 may be composed of a plurality of lines having a geometric shape such as a lattice shape, and the non-containing part 7 may be formed between the containing parts 6. By inverting this, as shown in FIG. 3D (D), the non-containing part 7 may be composed of a plurality of lines having a geometric shape such as a lattice shape, and the space between the non-containing parts 7 may be the containing part 6.

The non-woven fabric 5 more preferably has a plurality (two or more) of interfaces 9 in the area of the square 8. By the presence of a plurality of interfaces 9, the pinning action acts strongly on the droplets straddling both the containing part 6 and the non-containing part 7, and the surface flow of the liquid is less likely to occur. Specifically, this action is as follows. That is, the interface 9 is a boundary between different contact angles of the adjacent containing part 6 and the non-containing part 7 depending on the presence or absence of the liquid film cleaving agent, and the contact angle of the constituent fibers of the containing part 6 is that of the non-containing part 7 Since the contact angle of the constituent fibers is larger and the lubricity or hydrophobicity is imparted by the liquid film cleaving agent, wetting of the droplets is difficult to proceed. And the contact angle of the constituent fiber of the non-containing part 7 is smaller than the contact angle of the constituent fiber of the containing part 6, and the wetting of the liquid droplets is likely to proceed as compared with the case where there is a liquid film cleaving agent. Due to this difference in wettability, the outer periphery of the droplet on the containing portion 6 is shrunk inward with respect to the outer periphery of the droplet on the non-containing portion 7 as pinned, with the interface 9 as a boundary. It can be wrapped. The presence of a plurality of interfaces 9 increases the number of places where the droplets are confined, and the outer periphery of the droplet 90 is corrugated as shown in FIG. Along with the corrugation, the distance of the contact line of the droplet with the non-woven fabric 5 increases, and the droplet does not easily move on the surface of the non-woven fabric 5, and the action of suppressing the surface flow of the droplet is stronger. At the same time, the interface 9 serving as the boundary of the contact angle is made of the liquid film cleaving agent, so that the liquid film between the fibers of the nonwoven fabric 5 is cleaved, and the permeability in the liquid thickness direction is increased. Thereby, the surface flow preventive property of the liquid can be enhanced while realizing a high liquid remaining reduction of the nonwoven fabric 5.
Also, when there are a plurality of interfaces 9 in the area of the square 8, when the nonwoven fabric plane, the excretion liquid droplets or the liquid droplets flowing through the wearer's body at the time of wearing the absorbent article come into contact with the nonwoven fabric for the first time, or In the process of flowing on the surface of the nonwoven fabric after coming into contact with the nonwoven fabric, the probability of straddling both the containing part 6 and the non-containing part 7 becomes higher. Thereby, said effect | action works more strongly and it can further improve the high liquid residue reduction of a nonwoven fabric, and the surface flow prevention property of a liquid.

In the nonwoven fabric 5, the area | region of the square 8 containing the interface 9 which has the above effects may exist in the whole nonwoven fabric 5, and may exist in a part. That is, the combination of the liquid film cleaving agent containing part 6 and the non-containing part 7 may be on the entire surface of the nonwoven fabric 5 or on a part thereof.
It is preferable that at least the area of the square 8 is arranged at a position of the nonwoven fabric 5 that serves as a liquid receiving portion that directly receives the liquid. A liquid receiving part means the part which receives excretion, when the nonwoven fabric 5 is used for an absorbent article as the name. For example, when the nonwoven fabric 5 is applied as a top sheet of a paper diaper or a daytime napkin, the liquid receiving part can be considered as a central portion in the longitudinal direction and the width direction of the paper diaper or the daytime napkin. In addition, when the non-woven fabric 5 is applied as the top sheet of the night napkin, the liquid receiving portion is a central portion in the longitudinal direction and the width direction in the second region from the front when the night napkin is divided into four in the longitudinal direction. Can be considered. Here, “front” refers to a direction facing the abdomen of the wearer when the night napkin is worn. This is particularly effective from the viewpoint of liquid absorbency when the nonwoven fabric 5 is used as the top sheet of the absorbent article. That is, in the absorbent article, it is preferable that the square area of the nonwoven fabric 5 is in a portion that contacts the excretion portion of the wearer (excretion port contact portion) in order to effectively act on the excretion fluid. The excretion opening contact portion varies depending on the use of the absorbent article. For example, in the sanitary napkin 100 with wings as shown in FIG. 5, the leak-proof groove extending in the longitudinal direction from the position sandwiched by the wings 130 in the center position of the width of the top sheet 110 overlapping the absorbent body 120. A portion surrounded by 140 becomes the excretion opening contact portion 150. It is preferable that the nonwoven fabric 5 is comprised so that the area | region of the square 8 which has the 1 or more interface 9 may be arranged here.
In addition, with respect to the thickness direction of the nonwoven fabric 5, it is preferably contained at least on the surface that receives the liquid. In the surface sheet of the above example, it is preferable that at least a liquid film cleaving agent is contained on the skin contact surface side that comes into contact with the wearer's skin.

Moreover, in the nonwoven fabric 5, it is preferable that the area ratio of the containing part 6 with respect to the non-containing part 7 is larger than one. This means the area ratio in the region defined by the square 8 having a side of 5 mm. There should be at least one square area with a side of 5 mm that satisfies the area ratio of 1 or more with respect to the area of the nonwoven fabric surface where the inclusion part 6 and the non-inclusion part 7 are arranged. It is preferable that there is at least one from the liquid receiving portion at any position in the longitudinal direction of the nonwoven fabric 5, that is, in the direction corresponding to the longitudinal direction of the absorbent article. In this case, the “liquid receiving portion” is also included in the “any position in the direction matching the longitudinal direction of the nonwoven fabric 5, that is, the longitudinal direction of the absorbent article”. In addition, the said area ratio can be measured by the method using the above-mentioned oil blotting paper.
It has been confirmed that when the area ratio is greater than 1, the liquid flow can be stably reduced. Since the containing portion 6 is a portion where constriction occurs so that the outer periphery of the droplet is contracted to the inside, the constricting method is larger when the area ratio of the containing portion 6 to the non-containing portion 7 is larger than 1, and the waveform amplitude is large. It tends to occur. Thereby, the distance of the contact line of the droplet with the nonwoven fabric 5 increases, and the effect | action of the surface flow suppression of a droplet can be heightened. Furthermore, in the nonwoven fabric 5, when the area ratio is larger than 1, when the liquid droplets that are stopped from flowing into liquid enter between the fibers, the liquid film is easily subjected to the liquid film cleaving action. That is, with respect to the liquid received by the nonwoven fabric 5, the liquid film cleaving action and the liquid flow preventing action are more clearly expressed simultaneously, and the liquid surface flow preventing property of the liquid is enhanced while realizing a high liquid remaining reduction of the nonwoven fabric 5. Can do.

The above-mentioned area ratio (area of containing part / area of non-containing part) is more preferably 1.3 or more, and further preferably 1.5 or more, from the viewpoint of increasing the waveform. Further, the upper limit of the area ratio is not particularly limited. In the corrugation of the droplets, from the viewpoint of maintaining the balance between the constriction in the containing part 6 and the spreading in the non-containing part 7, the area ratio is preferably 16 or less, more preferably 10 or less, and even more preferably 3 or less. preferable.

Furthermore, in the nonwoven fabric 5, it is more preferable that the containing part 6 and the non-containing part 7 are periodically arranged on the nonwoven fabric surface. Thereby, the same area as the area defined by the squares 8 having one or more interfaces 9 is repeatedly arranged in the plane direction of the nonwoven fabric. When the area defined by the square 8 satisfies the condition that “the area ratio of the containing part 6 to the non-containing part 7 is greater than 1”, the square that satisfies the above area ratio in the periodic arrangement described above. Eight regions are repeatedly arranged in the plane direction of the nonwoven fabric. For example, the arrangement shown in FIGS. 3-1 and 3-2 described above can be used.
By arrange | positioning periodically, the said effect | action expressed in the area | region divided by the square 8 is expressed with high homogeneity in various points on the nonwoven fabric surface. That is, even when the position for receiving the liquid is not constant and is shifted for each liquid received, the expected pinning action on the droplet and the liquid film cleaving action between the fibers are effectively expressed. Thereby, the nonwoven fabric 5 can obtain the liquid permeability which was excellent in the wide surface, and can improve the surface flow prevention property of a liquid, implement | achieving high liquid residue reduction property.
This is effective from the viewpoint of liquid absorbency when the nonwoven fabric 5 is used as the top sheet of the absorbent article. When the nonwoven fabric 5 is used as a top sheet of an absorbent article, high leakage prevention and liquid permeability can be exhibited even if the attachment site of the droplet changes due to the manner of attachment or daily operation. Thereby, when the nonwoven fabric 5 is used as a surface sheet, it can contribute greatly to the improvement of the liquid absorptivity and attachment feeling of an absorbent article.

Moreover, in the nonwoven fabric 5, it is preferable that the sum of the width | variety of the containing part 6 and the non-containing part 7 is 2500 micrometers or less. In particular, it is preferable that the above-described condition of the sum of the widths is satisfied in the above-described region partitioned by a square having a side of 5 mm. Thereby, the contact line with the nonwoven fabric of the flowing liquid droplet (about 5 mm) becomes easy to corrugate, and the surface flow suppression effect of the liquid can be enhanced. At this time, it is preferable to satisfy the above-mentioned condition that “the area ratio is greater than 1” because the action of suppressing the surface flow of the liquid is further strengthened.
Here, the “width of the containing part 6” is the shortest distance between the adjacent non-containing parts 7 and 7. The “width of the non-containing part 7” is the shortest distance between the adjacent containing parts 6 and 6. For example, in the case of a striped pattern arrangement, as shown in FIG. 6A, the width of the containing portion 6 is a band width 6A between the adjacent non-containing portions 7 and 7, and the width of the non-containing portion 7 is The band width 7A between the adjacent containing parts 6 and 6 is 7A. In addition, as shown in FIG. 6B, in the case of a pattern arrangement in which the containing portions 6 are circular (dots) and are arranged at predetermined intervals, the width of the containing portions 6 is the diameter 6B of the circle and is not contained The width of the part 7 is the shortest distance 7B between the containing parts 6 and 6.
The above-mentioned width can be measured based on the above-mentioned definition by the method using the blotting paper described above.

The sum of the widths of the containing part 6 and the non-containing part 7 is more preferably 2000 μm or less, and further preferably 1500 μm or less, from the viewpoint of corrugation of the droplets. Further, the lower limit of the sum of the widths is not particularly limited, but from the viewpoint of increasing the amplitude of the waveform, the sum of the widths is preferably 100 μm or more, more preferably 500 μm or more, and further preferably 1000 μm or more. preferable.

Next, a preferred embodiment of the liquid film cleaving agent contained in the containing part of the nonwoven fabric according to the present invention will be described.

The liquid film cleaving agent of the first embodiment has an expansion coefficient of 15 mN / m or more 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 liquid film cleaving agent preferably has a water solubility of 0 g or more and 0.025 g or less. The nonwoven fabric of 1st Embodiment contains the said liquid film cleaving agent.

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, and is distinct from the interfacial tension between the liquid phase and the liquid film cleaving agent. To do. This distinction applies to other descriptions in the present specification.
_{S = γ w -γ o -γ wo} ····· (1)
γ _w: the liquid film surface tension γ _o of _(liquid): EkimakuHiraki cleaving agent of the surface tension γ _wo: interfacial tension between EkimakuHiraki cleaving agent of the 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 this respect, 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. It is a value measured in the environmental area of%. 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. Further, 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 (γ _o ) of the liquid film cleaving agent, 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 nonwoven fabric to be measured is a member (for example, a surface sheet) incorporated in an absorbent article such as a sanitary product or a disposable diaper, the measurement is taken out as follows. That is, in the absorbent article, 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 the 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 adding 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 (trade name: THE TRACKER, KRUSS, trade name: DSA25S, manufactured by TECRIS-ITCONCEPT) 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 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 fibers, 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 with respect to the liquid film clinging to the fiber surface without moving at the position attached to the fiber, and can inhibit the formation of the liquid film.

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 such a nonwoven fabric is incorporated in the absorbent article as a surface sheet, the retention of the liquid between the fibers is suppressed, and a liquid permeation path to the absorber is secured. 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 the present 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 the present embodiment, the surface tension of the liquid film cleaving agent is preferably 32 mN / m or less, more preferably 30 mN / m or less, further 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 2nd Embodiment is demonstrated.
The liquid film cleaving agent of the second embodiment has an expansion coefficient greater than 0 mN / m for a liquid with a surface tension of 50 mN / m, that is, a positive value, and an interfacial tension for a liquid with a surface tension 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 liquid film cleaving agent preferably has a water solubility of 0 g or more and 0.025 g or less.
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 action 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 the present 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).
Further, 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.

It is preferable that the nonwoven fabric containing the liquid film cleaving agent of the first embodiment and the nonwoven fabric containing the liquid film cleaving agent of the second embodiment 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 by 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 even 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 phosphates are preferable from the viewpoint of enhancing the affinity with the liquid film and simultaneously imparting the workability of the nonwoven fabric.
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 when used by dissolving in water, and are not the liquid film cleaving agent of the present invention. .

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 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 transfer of the liquid film cleaving agent from the fiber in which the liquid film cleaving agent is arranged to the liquid film, that is, the viscosity for maintaining diffusibility, 50000 or less is preferable, 20000 or less is more preferable, and 10,000 or less is further 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 YXY, as will be described later. .
Structure X is> C (A)-<C represents a carbon atom. <,>, And-indicate 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 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 , -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 a carbon number of 1 to 20, preferably a methyl group, an ethyl group or a propyl group), an alkoxy group (having a carbon number of 1 to 20). 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 is 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. In addition, a continuous bond between C (carbon atom) and Si is usually a single bond, but may include a double bond or a triple bond, and the bond between C and Si includes an ether group (- O-), amide group (—CONR ^A —: R ^A 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 the 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 polyoxyalkylene group, 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 YXY, Y is attached 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 YXY, the structures represented by the following formulas (1) to (11) are arbitrarily combined from a siloxane chain. 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 preferred), alkoxy group (preferably having 1 to 20 carbon atoms, for example, preferably methoxy group and ethoxy group), 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. As used herein, “long chain” refers to those having 12 or more carbon atoms, preferably those having 12 to 20 carbon atoms. Further, “higher” means one 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 a carbon number of 1 to 20, 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. The symbols of these repeating units are determined separately in each of the formulas (I) to (IV), and do not necessarily indicate the same integer and may be different.

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. Such a group having a modifying group and a silicone chain is not particularly limited, and examples thereof include those described in paragraphs [0006] and [0012] of JP-A 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, POP (24) -modified dimethyl silicone to which POP is added at 10 mol, 12 mol, or 24 mol.

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 nonwoven fabric 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).

As described later, 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.
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 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, 2-ethyl-hexyl 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 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. One C is bonded to another C in the number of 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, 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 the 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, preferably methoxy groups), 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), 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. The polyoxyalkylene alkyl ether is preferably lauryl ether to which POP is added in an amount of 3 mol to 24 mol, preferably 5 mol. 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 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 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 nonwoven fabric 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. The same applies to m, m ′, m ″, n, n ′, and n ″ in formulas (VII) to (XV). Note that “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, for example, depending on the number of moles of the polyoxyalkylene group in the polyether compound or nonionic surfactant. . 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 nonwoven fabric 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.

Also, sterols, phytosterols and sterol derivatives can be mentioned. Specific examples include cholesterol, sitosterol, stigmasterol, ergosterol, and mixtures thereof having a sterol structure of the formula (XII).

Specific examples of alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, and mixtures thereof as represented by 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 in} —COOC _m H _n represents an alcohol-derived hydrocarbon group that forms an ester.

Specific examples of the wax include ceresin, paraffin, petrolatum, mineral oil, liquid isoparaffin, and the like 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 according to the present invention, in addition to the above-described liquid film cleaving agent, other components may be included as necessary. Moreover, you may use the liquid film cleaving agent of 1st Embodiment, and the liquid film cleaving agent of 2nd Embodiment combining both agents other than the form used separately. This also applies to 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 according to the present invention 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. Therefore, the soft touch by thinning the fiber and the dry feeling 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 (VHX-1000 manufactured by Keyence Corporation). 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 fiber constituting the nonwoven fabric according to the present invention, those usually used for this type of article can be employed without any 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 according to the present invention contains a liquid film cleaving agent or a phosphate ester type anionic surfactant, it is excellent in suppressing liquid residue 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.

Even when a liquid film cleaving agent is applied to a non-woven fabric having a concavo-convex shape having convex and concave portions, the liquid film cleaving agent can be contained in the pattern shown in FIGS. 1 to 3 or any other pattern. 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 Hydrophilic: 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, even if it is an uneven | corrugated nonwoven fabric, the liquid flow prevention property in the surface can be improved, implement | achieving a high level liquid remaining reduction with the convex part which touches skin easily. In addition, this coating pattern is also used from the viewpoint of the production method because the convex portion comes into contact with the printing roll when a liquid film cleaving agent is applied to a nonwoven fabric having an uneven 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 FIGS. 9 to 11 is the same as or similar to that shown in FIG. Similarly, the pattern of the containing portion of the nonwoven fabric shown in FIGS. 12 to 14 is the same as or similar to that of FIG. 1 or FIG. 3-1 (A), and the pattern of the containing portion of the nonwoven fabric shown in FIG. Same or similar to (D).

Furthermore, since the nonwoven fabric according to the present invention 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 concerns on this invention 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 side that directly receives the liquid. For example, when the nonwoven fabric of the present invention is used as a surface sheet of an absorbent article, it is preferable that a liquid film cleaving agent is contained in at least the layer on the skin contact surface side.

In the nonwoven fabric according to the present invention, 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.

Further, in the production of the nonwoven fabric according to the present invention, a method usually used for this type of article can be adopted. 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 method for producing a nonwoven fabric according to the present invention, as described above, when the liquid film cleaving agent is applied after forming the nonwoven fabric, a method of immersing the raw material nonwoven fabric in a solution containing the liquid film cleaving agent can be 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 solution containing the liquid film cleaving agent can be prepared as a separate solution separately as a fiber treatment 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 according to the present invention, 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 10 shown in FIG. 9 is composed of two layers, an upper layer 11 on the upper surface 1A (skin contact surface when used as a surface sheet) side and a lower layer 12 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) 13). The lower layer 12 is a layer in which heat shrinkage of the heat-shrinkable fiber is expressed. The upper layer 11 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.
The nonwoven fabric 10 can be manufactured by, for example, the materials and manufacturing methods described in paragraphs [0032] to [0048] of JP-A-2002-187228. In this manufacturing, for example, after embossing the upper layer 11 and the lower layer 12 from the upper layer side 11, 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 interval between the embossed portions is reduced. Due to this deformation, the fibers of the upper layer 11 protrude from the embossed concave portion 13 toward the upper surface 1 </ b> A to form a convex portion 14. Alternatively, the upper layer is laminated in a state where the lower layer 12 in which the heat shrinkage is developed is stretched, and the above-described embossing is performed. Thereafter, when the extended state of the lower layer 12 is released, the upper layer 11 side rises to the upper surface 1A side, and the convex portion 14 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 10 thus manufactured, the upper layer 11 is squeezed and joined to the lower layer side 12 in the embossed recess (concave joint) 13. The embossed recesses 13 are formed in the form of dots in the plane direction of the nonwoven fabric 10, and the portion surrounded by the embossed recesses 13 is the above-described convex portion 14 in which the upper layer 11 is raised. The convex part 14 is a three-dimensional solid shape, for example, has a dome shape. As for the convex part 14 formed with the above manufacturing methods, the fiber is in a rougher state than the lower layer 12. The inside of the convex portion 14 may be filled with fibers as shown in FIG. 9 or may have a hollow portion formed by separating the upper layer 11 and the lower layer 12. Arrangement of the embossed concave portion 13 and the convex portion 14 can be arbitrary, and may be a lattice arrangement, for example. Examples of the lattice arrangement include an arrangement in which a plurality of rows each including a plurality of embossed recesses 13 are arranged, and the embossed recesses 13 in each row are shifted by an anti-pitch between adjacent rows. In addition, when the embossed recess 13 is viewed in a plan view, the embossed recess 13 may be a dot, a circle, an ellipse, a triangle, a rectangle, or another polygon, and can be arbitrarily set as appropriate. Further, the embossed recess 13 may be linear in addition to the dot shape.

Since the nonwoven fabric 10 has an uneven surface having the convex portion 14 and the embossed concave portion 13 on the upper surface 1A side, the nonwoven fabric 10 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 11 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 10 is incorporated as a top sheet having the upper surface 10A as the skin contact surface and the lower surface 1B as the non-skin contact surface, the skin contact surface side is uneven with the convex portions 14 and the embossed concave portions 13. Excellent breathability.
The nonwoven fabric 10 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 10 is not restricted to the two-layer structure of the upper layer 11 and the lower layer 12, and may have another layer. For example, a single layer or a plurality of layers may be disposed between the upper layer 11 and the lower layer 12, and a single layer or a plurality of layers may be disposed on the upper surface 10A side and the lower surface 10B side of the nonwoven fabric 10. This single layer or multiple layers may be a layer having heat-shrinkable fibers or a layer having non-heat-shrinkable fibers.

Nonwoven fabrics 20, 30, 40, 50, 60, and 70 (second to seventh embodiments) are shown below as other specific examples of the nonwoven fabric of the present invention having an uneven shape.

First, the nonwoven fabric 20 of a 2nd embodiment is a two-layer structure which has the hollow part 21, as shown in FIG. Both layers contain thermoplastic fibers. In the nonwoven fabric 20, it has the junction part 22 in which the 1st nonwoven fabric 20A and the 2nd nonwoven fabric 20B were partially heat-sealed. In the non-joining part surrounded by the joining part 22, the first nonwoven fabric 20A protrudes in a direction away from the second nonwoven fabric 20B, and has a large number of convex parts 23 each having a hollow part 21 therein. The joint portion 22 is a concave portion located between the adjacent convex portions 23 and 23, and constitutes the concave and convex portions of the first surface 1 </ b> A together with the convex portion 23. The nonwoven fabric 20 can be formed by a commonly used method. For example, the first nonwoven fabric 20 </ b> A is unevenly shaped by meshing two uneven rolls, and then the second nonwoven fabric is bonded to obtain the nonwoven fabric 20. From the viewpoint of shaping the nonwoven fabric by meshing the concave and convex rolls, it is preferable that both the first nonwoven fabric 20A and the second nonwoven fabric 20B include non-heat-extensible and non-heat-shrinkable heat-sealing fibers.
For example, when the nonwoven fabric 20 is used by being laminated on the absorbent body as a surface sheet with the first surface 1A facing the skin contact surface side, the liquid permeability from the first surface 1A side to the second surface 1B side is used. Excellent. Specifically, liquid permeation through the hollow portion 21 is performed. Moreover, a wearer's body pressure is added to the convex part 23, and the liquid in the convex part 23 transfers to the 2nd nonwoven fabric 3 directly. Thereby, there is little liquid residue in the 1st surface 1A side. Such an action can be continuously exerted at a higher level by 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. That is, even when there is long-term use or a large amount of excretion, the liquid permeation route is secured by rupturing the liquid film, so that the liquid permeability as described above can be sufficiently exhibited.

Next, as shown in FIGS. 11A and 11B, the nonwoven fabric 30 of the third embodiment includes a first fiber layer 301 that includes thermoplastic fibers and has a shape that is uneven on both sides. FIG. 11A shows a non-woven fabric 30A having a one-layer structure composed of only the first fiber layer 301. FIG. FIG. 11B shows a nonwoven fabric 30B having a two-layer structure including a first fiber layer 301 and a second fiber layer 302 joined along the second surface 1B side of the first fiber layer 301. Below, each nonwoven fabric is demonstrated concretely.
In the nonwoven fabric 30A (first fiber layer 301) shown in FIG. 11A, the first protrusion 31 protruding to the first surface 1A and the second protrusion 32 protruding to the second surface 1B side are the nonwoven fabric 30A. They are arranged alternately and continuously in different directions that intersect when viewed in plan. The first projecting portion 31 and the second projecting portion 32 each have an internal space that is released on the opposite surface side, and this portion forms the recesses 33 and 34 on the surface. Thereby, the first surface 1 </ b> A has an uneven shape of the first protrusion 31 and the recess 34. Further, the second surface 1 </ b> B has an uneven shape of the second protrusion 32 and the recess 33. Further, the nonwoven fabric 30 </ b> A has a wall portion 35 that connects the first protruding portion 31 and the second protruding portion 32. The wall part 35 forms the wall surface of each internal space of the 1st protrusion part 31 and the 2nd protrusion part 32, and has a cyclic structure in a plane direction. The fiber constituting the wall portion 35 has fiber orientation in the direction connecting the first protruding portion 31 and the second protruding portion 32 at any point of the annular structure. As a result, stiffness is born on the wall. As a result, the nonwoven fabric 30A has a moderate cushioning property, is excellent in recoverability even when pressure is applied, and can avoid collapse of each internal space. Moreover, since the dispersibility with respect to a body pressure is high by a double-sided protrusion, and a contact area is also suppressed, it is excellent in soft touch and liquid return prevention property. 30 A of nonwoven fabrics can employ | adopt as a surface sheet | seat of an absorbent article by making any surface into the skin contact surface side, and can provide moderate cushioning property, soft touch, and the outstanding liquid return prevention property to an absorbent article.
A nonwoven fabric 30B shown in FIG. 11B is formed by bonding the second fiber layer 302 along the unevenness on the second surface 1B side of the first fiber layer 301 described above. The nonwoven fabric 30B typically uses the first surface 1A as a skin contact surface. On the first surface 1 </ b> A side of the nonwoven fabric 30 </ b> B, the uneven shape of the first protruding portion 31 and the recessed portion 34 of the first fiber layer 301 described above spreads, and the wall portion of the annular structure between the first protruding portion 31 and the recessed portion 32. 35 is arranged. Therefore, the non-woven fabric 30B also has the fiber orientation of the first fiber layer 301 described above, whereby a stiffness is generated in the wall portion and excellent in unevenness recovery.
In addition to this, the nonwoven fabric 30B is bulky and low in weight because the fiber web is shaped, formed into a nonwoven fabric, and both layers are joined by hot air treatment in an air-through process. In particular, since the fiber layers 301 and 302 are joined by thermal fusion of the fibers with hot air, a gap is formed between the fibers in the joint portion between the fiber layers, and even the concave portion 32 serving as the joint portion. The liquid passing speed is fast. Further, the fiber density of the second fiber layer 302 is the fiber density of the other parts of the first fiber layer 301 and the second fiber layer 302 on the second surface 1B side of the top of the first protrusion 31 of the first fiber layer 301. Lower portion 36. Due to the presence of the low fiber density portion 36, the first protruding portion 31 of the first fiber layer 301 is easily recessed even at a low load, and thus the cushioning property of the nonwoven fabric 30B is enhanced. When employ | adopting the nonwoven fabric 30B as a surface sheet of an absorbent article, it is preferable to make the 1st surface 1A side (namely, the 1st fiber layer 301 side) into the skin contact surface side.
Also in the nonwoven fabric 30 (30A and 30B), the liquid permeation path is always secured by 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. This widens the range of design for fiber diameter and fiber density.
For the production of the nonwoven fabric 30 (30A and 30B), for example, an air-through process in which a multi-stage hot air treatment is performed on the fiber web while controlling the hot air temperature and the wind speed can be employed. For example, for the nonwoven fabric 30A (first fiber layer 301), the manufacturing method described in paragraphs [0031] and [0032] of JP2012-136790A can be used. Moreover, it is preferable to use what has a solid projection part and an opening part as a support body which unevenly shapes a web. For example, the support shown in FIGS. 1 and 2 of JP2012-149370 and the support shown in FIGS. 1 and 2 of JP2012-149371 can be used. Moreover, the nonwoven fabric 30B (laminated nonwoven fabric of the first fiber layer 301 and the second fiber layer 302) is manufactured by laminating the fiber web that becomes the second fiber layer 302 in the air-through process of the first fiber layer 301 described above. can do. For example, the production methods described in paragraphs [0042] to [0064] of JP2013-124428A can be used. From the viewpoint of shaping the nonwoven fabrics 30A and 30B by air-through processing, both the first fiber layer 301 and the second fiber layer 302 are preferably non-heat-extensible and non-heat-shrinkable heat-bonded fibers.

Next, as shown in FIG. 12, the nonwoven fabric 40 of the fourth embodiment is composed of one layer containing thermoplastic fibers, and on the first surface 1A side, a semi-cylindrical convex portion 41 and the side of the convex portion 41 A plurality of recesses 42 arranged along the edge are alternately arranged. A concave bottom portion 43 made of non-woven fiber is disposed below the concave portion 42. The concave portion 43 has a fiber density lower than that of the convex portion 41. In this nonwoven fabric 30, another fiber layer 45 may be partially laminated on the convex portion 41 (see FIG. 13). When the nonwoven fabric 40 is incorporated into an absorbent article as a surface sheet having the first surface 1A side as the skin contact surface side, the liquid received by the convex portion 41 easily moves to the concave portion 42, and the second surface 1B side in the concave portion 43. Easy to move to. Thereby, there is little liquid residue and stickiness of skin is suppressed.
Also in the nonwoven fabric 40, the liquid permeation path is always ensured by the action of the liquid film cleaving agent described above, or the liquid film cleaving agent and the phosphate type anionic surfactant. This widens the range of design for fiber diameter and fiber density.
Such a non-woven fabric 40 can be formed by spraying a fluid such as hot air onto the portion of the fiber web that forms the recess 42 and moving the fiber. Thereby, the fiber density of the recessed part bottom part 43 can be made lower than the periphery.

Next, as shown in FIG. 14, the nonwoven fabric 50 of the fifth embodiment has a concavo-convex structure in which streaky ridges 51 and ridges 52 extending in one direction (Y direction) are alternately arranged. Have. Moreover, in the thickness direction of this nonwoven fabric sheet 50, the said uneven | corrugated structure can be divided into 3 equal parts of 50 A of top areas, the bottom area 50B, and the side area 50C located among these.
The nonwoven fabric 50 has a plurality of heat fusion portions 55 at the intersections of the constituent fibers 54. Focusing on one constituent fiber 54, the constituent fiber 54 is, as shown in FIG. 15, a large-diameter portion sandwiched between two small-diameter portions 56 having a small fiber diameter between adjacent fused portions 55. 57. Thereby, the softness | flexibility of the nonwoven fabric 50 improves and the touch becomes favorable. Moreover, the contact area with skin is reduced per fiber unit, and a better dry feeling is obtained. Further, from the viewpoint of flexibility, the transition point 58 from the small diameter portion 56 to the large diameter portion 57 is within a range of 1/3 of the interval T between the adjacent fusion portions 55 and 55 and close to the fusion portion 55. It is preferably in the range (T1 and T3 in FIG. 15). Note that there may be a plurality of combinations of the small diameter portion 56 and the large diameter portion 57 sandwiched between the small diameter portion 56 and the interval T. The configuration of the small-diameter portion 56 and the large-diameter portion 57 in such a constituent fiber is formed by stretching the fiber during the blade groove stretching process for forming the convex strip portion 51 and the concave strip portion 52. The fiber used at that time is preferably a fiber having a high degree of stretching. Examples thereof include heat-extensible fibers that are obtained through the treatment steps described in paragraph [0033] of JP2010-168715A and that extend in length due to a change in the crystalline state of the resin due to heating.
Further, in the nonwoven fabric 50, it is preferable that the hydrophilicity of the small diameter portion is smaller than the hydrophilicity of the large diameter portion from the viewpoint of liquid permeability. This difference in hydrophilicity can be formed by adding a stretchable component (hydrophobic component) to the fiber treatment agent attached to the fiber. In particular, it is preferable that a stretchable component and a hydrophilic component are contained. Specifically, when the fiber is stretched by the blade groove stretching process described above, a stretchable component spreads in the stretched small-diameter portion 35 and a difference in hydrophilicity occurs between the large-diameter portion. In the large-diameter portion, the hydrophilic component that hardly spreads remains, and the hydrophilicity becomes higher than that in the small-diameter portion. Examples of the stretchable component include a silicone resin having a low glass transition point and a flexible molecular chain, and a polyorganosiloxane having a Si—O—Si chain as the main chain is preferably used as the silicone resin. It is done.
In addition, the nonwoven fabric 50 preferably has a fiber density in the side wall region 30C lower than that in the top region 30A and the bottom region 30B, from the viewpoint of liquid permeability.
Also in the nonwoven fabric 50, the liquid permeation path is always ensured by the action of the liquid film cleaving agent, or the liquid film cleaving agent and the phosphate ester type anionic surfactant. This widens the range of design for fiber diameter and fiber density.
The nonwoven fabric 50 may be used alone, may be bonded to a flat fiber layer to form a laminated nonwoven fabric, or may be laminated to an uneven fiber layer and integrated along the unevenness. For example, you may laminate | stack on the 2nd nonwoven fabric in the nonwoven fabric 20 of a 2nd embodiment (FIG. 10), the nonwoven fabric 30A of a 3rd embodiment (FIG. 11 (A)), and a 4th embodiment (FIG. 12 or FIG. 13). ).

Next, the nonwoven fabric 60 of the sixth embodiment has an uneven shape including heat-extensible fibers. As shown in FIG. 16, the 1st surface 1A side is uneven | corrugated shape. On the other hand, the second surface 1B side is flat or has a very small degree of unevenness than the first surface 1A side. Specifically, the uneven shape on the first surface 1A side includes a plurality of convex portions 61 and a linear concave portion 62 surrounding the convex portions 61. The recess 62 has a pressure-bonded portion where the constituent fibers of the nonwoven fabric 60 are pressure-bonded or bonded, and the heat-extensible fiber is in a non-stretched state. The convex part 62 is the part which the heat | fever extensible fiber heat-expanded and protruded to the 1st surface 1A side. Therefore, the convex part 62 is a part whose fiber density is sparser and bulkier than the concave part 62. Moreover, the linear recessed part 62 is arrange | positioned at the grid | lattice form, and the convex part 61 is dotted and arrange | positioned at each area | region divided by a grid | lattice. Thereby, as for the nonwoven fabric 60, a contact area with a wearer's skin is restrained and steaming and a rash are effectively prevented. Moreover, the convex part 61 which touches skin becomes bulky by the heat | fever expansion | extension of a heat | fever extensible fiber, and becomes a soft touch. In addition, the nonwoven fabric 60 may have a single layer structure or may have a structure of two or more layers. For example, in the case of a two-layer structure, the layer on the second surface 1B side may not contain heat-extensible fibers or may have a lower content of heat-extensible fibers than the layer on the first surface 1A side having an uneven shape. preferable. Moreover, it is preferable that both layers are joined by the pressure bonding part of the recessed part 62. FIG.
Also in the nonwoven fabric 60, the liquid permeation path is always ensured by the action of the liquid film cleaving agent or the liquid film cleaving agent and the phosphate ester type anionic surfactant. This widens the range of design for fiber diameter and fiber density.
Such a nonwoven fabric 60 can be manufactured by the following method. First, the linear recessed part 62 is formed with respect to a fiber web by heat embossing. At this time, in the recessed part 62, the heat | fever extensible fiber is crimped | bonded or melt | fused, and is fixed without being heat-heat-expanded. Next, the heat-extensible fibers existing in the portion other than the concave portion 61 are elongated by air-through processing to form the convex portion 61, thereby forming the nonwoven fabric 60. Further, the constituent fibers of the nonwoven fabric 60 may be a blend of the above-described heat-extensible fibers and non-heat-extensible heat-fusible fibers. Examples of these constituent fibers include those described in paragraphs [0013] and [0037] to [0040] of JP-A-2005-350836, and paragraphs [0012] and [0024] of JP-A-2011-127258. To [0046] can be used.

Next, the nonwoven fabric 70 of the seventh embodiment is a laminated nonwoven fabric composed of an upper layer 71 and a lower layer 72 containing thermoplastic fibers, as shown in FIG. In the upper layer 71, convex portions 73 and concave portions 74 are alternately arranged, and the concave portions 74 are open. The fiber density of the concave portion 74 is set lower than the fiber density of the convex portion 73. The region where the convex portions 73 and the concave portions 74 are alternately and repeatedly disposed may be part of the upper layer 71 or the entire region. When the region where the convex portion 73 and the concave portion 74 are alternately arranged is located in a part of the upper layer, the region is a liquid receiving region (corresponding to the excretion portion) when the nonwoven fabric 70 is used as the top sheet of the absorbent article. It is preferable that it exists in the part used as an area | region. On the other hand, the lower layer 72 has a substantially uniform fiber density. The lower layer 72 is laminated at least corresponding to a region where the convex portions 73 and the concave portions 74 of the upper layer 71 are alternately arranged. Thereby, since the nonwoven fabric 70 has the high fiber density of the convex part 73, it has a bulky cushioning property, and when it uses as a surface sheet of an absorbent article, it will become difficult to produce liquid return. Further, since the nonwoven fabric 70 has a low fiber density in the concave portion 74 and is in an open state, the nonwoven fabric 70 is excellent in liquid permeability, in particular, permeability to a highly viscous liquid.
Also in the nonwoven fabric 70, the liquid permeation path is always ensured by the action of the above-described liquid film cleaving agent, or the liquid film cleaving agent and the phosphate type anionic surfactant. This widens the range of design for fiber diameter and fiber density.
Such a nonwoven fabric 70 can be manufactured, for example, by the method described in JP-A-4-24263, page 6, lower left column, line 12 to page 8, upper right column, line 19.

The liquid film cleaving agent and the nonwoven fabric containing the liquid film cleaving agent according to the present invention can be applied to various fields by taking advantage of its soft touch and reduction of liquid residue. For example, a top sheet, a second sheet (a sheet disposed between the top sheet and the absorbent body) in an absorbent article used to absorb liquid discharged from the body such as sanitary napkins, panty liners, disposable diapers, and incontinence pads It is preferably used as an absorbent body, a covering sheet that wraps the absorbent body, a leak-proof sheet, or a personal wipe sheet, a skin care sheet, and an objective wiper. When using the nonwoven fabric of this invention as a surface sheet or a second sheet of an absorbent article, it is preferable to use the 1st layer side of this nonwoven fabric as a skin opposing surface side. In addition, the liquid film cleaving agent according to the present invention can be applied to various fiber materials such as a woven cloth as long as it has an action of cleaving the liquid film.

An appropriate range of the basis weight of the web used for manufacturing the nonwoven fabric according to the present invention 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.

An absorbent article used for absorbing liquid discharged from the body typically includes a top sheet, a back sheet, and a liquid-retaining absorbent disposed between both sheets. As the absorbent body and the back sheet when the nonwoven fabric according to the present invention is used as a top sheet, materials usually used in the technical field can be used without particular limitation. For example, as the absorbent body, a fiber assembly made of a fiber material such as pulp fiber or a fiber assembly in which an absorbent polymer is held can be coated with a covering sheet such as tissue paper or nonwoven fabric. As the back sheet, a liquid-impermeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability. The absorbent article may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when applying an absorbent article to a disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the topsheet.

The present invention further discloses the following nonwoven fabric and absorbent article with respect to the above-described embodiment.

<1>
The nonwoven fabric surface has a containing part containing a liquid film cleaving agent and a non-containing part not containing the liquid film cleaving agent, and one side with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when the square of 5 mm is divided.

<2>
The nonwoven fabric according to <1>, 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.

<3>
The nonwoven fabric surface has a containing part containing the following compound C1 and a non-containing part not containing the following compound C1, and a square having a side of 5 mm with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged. The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when partitioning.
[Compound C1]
A compound having an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.

<4>
The expansion coefficient of the liquid film cleaving agent or the compound C1 is more preferably 20 mN / m or more, further preferably 25 mN / m or more, and particularly preferably 30 mN / m or more, and the nonwoven fabric according to the above <2> or <3> .
<5>
The interfacial tension of the liquid film cleaving agent or the compound C1 with respect to a liquid having a surface tension of 50 mN / m is preferably 20 mN / m or less, more preferably 17 mN / m or less, still more preferably 13 mN / m or less, and 10 mN / m. The non-woven fabric according to any one of the above items <2> to <4>, wherein the following is still more preferable, 9 mN / m or less is particularly preferable, 1 mN / m or less is particularly preferable, and greater than 0 mN / m.

<6>
<1> to <5 above, wherein the liquid film cleaving agent or the compound C1 comprises a compound having at least one structure selected from the group consisting of the following structures X, XY, and YXY. > Any one of>.
Structure X is> C (A)-<C represents a carbon atom. <,>, And-indicate 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 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 , -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.

<7>
The liquid film cleaving agent or the compound C1 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> to <6>.
<8>
The liquid film cleaving agent or the compound C1 is composed of 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 nonwoven fabric according to any one of <1> to <7>, 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 a carbon number of 1 to 20, 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. Note that the symbols of these repeating units are determined separately in each of the formulas [I] to [IV], and do not necessarily indicate the same integer, and may be different.

<9>
<1>, wherein the liquid film cleaving agent has 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. The nonwoven fabric described.

<10>
The nonwoven fabric surface has a containing part containing the following compound C2 and a non-containing part not containing the following compound C2, and a square having a side of 5 mm with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged. The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when partitioning.
[Compound C2]
A compound having 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.

<11>
The interfacial tension of the liquid film cleaving agent or the compound C2 with respect to a liquid having a surface tension of 50 mN / m is preferably 17 mN / m or less, more preferably 13 mN / m or less, still more preferably 10 mN / m or less, and 9 mN / m. The nonwoven fabric according to <9> or <10>, wherein the following is particularly preferable, 1 mN / m or less is particularly preferable, and is greater than 0 mN / m.
<12>
The expansion coefficient of the liquid film cleaving agent or the compound C2 with respect to a liquid having a surface tension of 50 mN / m is preferably 9 mN / m or more, more preferably 10 mN / m or more, further preferably 15 mN / m or more, and 50 mN / m. The nonwoven fabric according to any one of <9> to <11>, which is:

<13>
<1> and <9>, wherein the liquid film cleaving agent or the compound C2 is composed of a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY: The nonwoven fabric according to any one of to <12>.
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 are combined Represents a hydrocarbon chain of structure. At the terminal 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 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. 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.
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.

<14>
The liquid film cleaving agent or the compound C2 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] and having a mass average molecular weight of 1000 or more. Any one of the above <1> and <9> to <13>, 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 nonwoven fabric described in 1.

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. Note that “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.
<15>
The liquid film cleaving agent or the compound C2 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 nonwoven fabric according to any one of <1> and <9> to <13>, comprising at least one kind.

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 in} —COOC _m H _n represents an alcohol-derived hydrocarbon group that forms an ester.

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

<16>
The nonwoven fabric according to any one of <1> to <15>, wherein the square region is arranged at a position to be a liquid receiving part.
<17>
When the nonwoven fabric is applied as a surface sheet of a paper diaper or a daytime napkin, the liquid receiving part is a central part in the longitudinal direction and the width direction of the paper diaper or the daytime napkin, and the nonwoven fabric is used as a surface sheet of a nighttime napkin. When applied, the nonwoven fabric according to <16>, which is a central portion in the longitudinal direction and the width direction in the second region from the front when the night napkin is divided into four in the longitudinal direction.
<18>
The nonwoven fabric according to any one of <1> to <17>, wherein a plurality of the interfaces exist in the square region.
<19>
The nonwoven fabric according to any one of <1> to <18>, wherein an area ratio of the containing part to the non-containing part is larger than 1 in the square region.
<20>
Any one of <16> to <19>, wherein at least one square having an area ratio of the containing part to the non-containing part of greater than 1 is arranged at any position in the longitudinal direction of the nonwoven fabric from the liquid receiving part. Or the nonwoven fabric according to 1.
<21>
The area ratio, that is, the area of the containing part / the area of the non-containing part is more than 1 and 16 or less, preferably 1.3 or more, more preferably 1.5 or more, more preferably 10 or less, and more preferably 3 or less. The preferred nonwoven fabric according to <19> or <20>.
<22>
The nonwoven fabric according to <19> or <20>, wherein the area ratio, that is, the area of the containing part / the area of the non-containing part is 1.5 or more and 3 or less.

<23>
The nonwoven fabric according to any one of <1> to <22>, wherein the containing part and the non-containing part are periodically arranged on a nonwoven fabric surface.
<24>
Either of the above-mentioned <1> to <23>, wherein both the containing part and the non-containing part extend in a band shape in the longitudinal direction, and the band-like containing part and the non-containing part are alternately arranged in the width direction. The nonwoven fabric according to 1.
<25>
Any one of the above items <1> to <23>, wherein the containing portion has a circular shape, and the containing portions are plurally spaced apart from each other along both the longitudinal direction and the width direction, and are distributed in a plurality of directions. The nonwoven fabric according to 1.
<26>
The nonwoven fabric according to any one of the above items <1> to <23>, wherein the containing portion is composed of a plurality of lines having a geometric shape, and the portion between the containing portions is the non-containing portion.
<27>
The non-woven fabric according to any one of <1> to <23>, wherein the non-containing portion includes a plurality of lines having a geometric shape, and a space between the non-containing portions is the containing portion.

<28>
The nonwoven fabric according to any one of <1> to <27>, wherein the sum of the widths of the adjacent containing portion and the non-containing portion is 2500 μm or less.
<29>
The sum of the widths of the adjacent containing part and the non-containing part is 100 μm or more and 2500 μm or less, preferably 2000 μm or less, more preferably 1500 μm or less, more preferably 500 μm or more, and more preferably 1000 μm or more. 28>.
<30>
The non-woven fabric according to <28>, wherein the sum of the widths of the adjacent containing part and the non-containing part is 1000 μm or more and 1500 μm or less.

<31>
The nonwoven fabric according to any one of <1> to <30>, wherein the contact angle of the constituent fibers of the containing part is larger than the contact angle of the constituent fibers of the non-containing part.
<32>
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 70 degrees or less, preferably 10 degrees or more, more preferably 20 degrees or more, and 50 degrees. The non-woven fabric according to <31>, wherein the following is preferable, and 30 degrees or less is more preferable.
<33>
The non-woven fabric according to <31>, wherein 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 30 degrees or less.
<34>
Any of <31> to <33> above, 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 further preferably 70 degrees or less. Or the nonwoven fabric according to 1.
<35>
Any one of the above items <31> to <34>, 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. The nonwoven fabric according to 1.

<36>
The nonwoven fabric according to any one of <1> to <35>, wherein the liquid film cleaving agent, the compound C1 or the compound C2 has a water solubility of 0 g or more and 0.025 g or less.

<37>
The surface tension of the liquid film cleaving agent, the compound C1 or the compound C2 is preferably 32 mN / m or less, more preferably 30 mN / m or less, further preferably 25 mN / m or less, particularly preferably 22 mN / m or less, and 1 mN. The nonwoven fabric according to any one of <1> to <36>, preferably at least / m.

<38>
The nonwoven fabric according to any one of <1> to <37>, wherein the nonwoven fabric has an uneven shape having a convex portion and a concave portion.
<39>
The nonwoven fabric according to <38>, wherein the top part of the convex part has the containing part.
<40>
The nonwoven fabric according to <38> or <39>, wherein the bottom of the recess has the non-containing portion.
<41>
The nonwoven fabric according to <38>, wherein the convex portion and the containing portion are matched, and the concave portion and the non-containing portion are matched.

<42>
<1> to <41>, wherein the liquid film cleaving agent, the compound C1, or the compound C2 is localized near at least some of the fiber entanglement points or fiber fusion points. Non-woven fabric.

<43>
An absorbent article using the nonwoven fabric according to any one of <1> to <42> as a surface sheet.
<44>
The absorbent article according to <43>, wherein the absorbent article is a sanitary napkin.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not construed as being limited thereto. 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. “←” means the same as the description on the left.

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 the fibers in the upper layer was 80 μm, and the distance between the fibers in the lower layer was 60 μm. Moreover, the basic weight of the said nonwoven fabric was 74 g / m < ² >.
Polyoxyethylene (POE) modified dimethyl silicone (KF-6015 manufactured by Shin-Etsu Chemical Co., Ltd.) and X in the structure XY is from —Si (CH ₃ ) ₂ O— to the surface of the uneven structure of the raw material nonwoven fabric. A dimethylsilicone chain, wherein 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 No. 3 and a liquid film cleaving agent having a mass average molecular weight of 4000 were subjected to pattern coating by a flexographic printing method. Thereby, the nonwoven fabric sample S1 which made the inclusion part and the non-containment part into the striped pattern arrangement | positioning shown in FIG. 1 was produced. Polyoxyethylene (POE) -modified dimethyl silicone as the liquid film cleaving agent, the content ratio (OPU) of the entire nonwoven fabric to the fiber mass, the number of interfaces in a square area of 5 mm on one side, the ratio of the area, the inclusion part and the non-containment The width of the part and the sum of the widths were as shown in Table 1.
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)
Table 1 shows the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the area, the width of the inclusion and non-inclusion parts, and the sum of the widths. A nonwoven fabric sample S2 of Example 2 was produced in the same manner as in Example 1 except that.

(Example 3)
Table 1 shows the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the areas, the widths of the inclusion and non-inclusion parts, and the sum of the widths. A nonwoven fabric sample S3 of Example 3 was produced in the same manner as in Example 1 except that.

Example 4
Table 1 shows the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the areas, the widths of the inclusion and non-inclusion parts, and the sum of the widths. A nonwoven fabric sample S4 of Example 4 was produced in the same manner as in Example 1 except that.

(Example 5)
Table 1 shows the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the areas, the widths of the inclusion and non-inclusion parts, and the sum of the widths. A nonwoven fabric sample S5 of Example 5 was produced in the same manner as in Example 1 except that.

(Example 6)
The inclusion portion and the non-contained portion have a pattern arrangement in which the dots shown in FIG. The nonwoven fabric sample S6 of Example 6 was prepared in the same manner as in Example 1 except that the number of interfaces in the region, the ratio of the areas, the width of the containing part and the non-containing part, and the sum of the widths were as shown in Table 1. .

(Example 7)
Epoxy-modified dimethylsilicone (KF-101, manufactured by Shin-Etsu Chemical Co., Ltd.) as a liquid film cleaving agent, X in structure XY is a dimethylsilicone chain composed of —Si (CH ₃ ) ₂ O—, Y is — (RC ₂ H ₃ O) — consisting of an epoxy group having a modification rate of 32% and a mass average molecular weight of 35800, and dissolving the liquid film cleaving agent in solute ethanol A coating solution of a liquid film cleaving agent was prepared with a component of 3.0% by mass.
Using the coating solution of the liquid film cleaving agent, the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the area, the content part and the non-content A nonwoven fabric sample S7 of Example 7 was produced in the same manner as in Example 1 except that the width of the containing part and the sum of the widths were as shown in Table 2.
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 capric acid (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 bond) 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. The liquid film cleaving agent was dissolved in solute ethanol to prepare a liquid film cleaving agent coating solution with 3.0% by mass of the active ingredient of the liquid film cleaving agent.
Using the coating solution of the liquid film cleaving agent, the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the area, the content part and the non-content A nonwoven fabric sample S8 of Example 8 was produced in the same manner as in Example 1 except that the width of the containing part and the sum of the widths were as shown in Table 2.
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
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. A coating solution of a liquid film cleaving agent was prepared as mass%.
Using the coating solution of the liquid film cleaving agent, the content ratio (OPU) of the liquid film cleaving agent with respect to the fiber mass of the entire nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the area, the content part A nonwoven fabric sample S9 of Example 9 was produced in the same manner as in Example 1 except that the width of the containing part and the sum of the widths were as shown in Table 2.
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.

(Examples 10 to 12)
The content ratio (OPU) of the liquid film cleaving agent with respect to the total fiber mass of the nonwoven fabric, the number of interfaces in a square area of 5 mm on one side, the ratio of the areas, the width of the inclusion part and the non-inclusion part, and the sum of the widths are shown in Table 2. Except for the above, nonwoven fabric samples S10 to S12 of Examples 10 to 12 were produced in the same manner as Example 1.

(Comparative Example 1)
The raw material nonwoven fabric used in Example 1 before applying the liquid film cleaving agent was prepared as it is as the nonwoven fabric sample C1 of Comparative Example 1.
(Comparative Example 2)
A nonwoven fabric sample C2 of Comparative Example 2 was produced in the same manner as in Example 1 except that the liquid film cleaving agent used in Example 1 was applied to the entire surface of the raw material nonwoven fabric.

(Liquid remaining amount of surface sheet (nonwoven fabric sample))
As an example of an absorbent article, a surface sheet is removed from a sanitary napkin (manufactured by Kao Corporation: Laurier F happiness bare skin 30 cm, made in 2014), and a non-woven fabric sample (hereinafter referred to as a non-woven fabric sample) is laminated instead. A sanitary napkin for evaluation obtained by fixing was prepared.
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. The unit of viscosity cP (centipoise) is converted by 1 cP = 1 × 10 ⁻³ Pa · s.

(Liquid flow length on 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 section with the top sheet facing upward. 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 of the three times was defined as the liquid flow distance (mm). The liquid flow distance is an index of how easily the liquid flows on the surface without being absorbed by the test sample and is likely to leak at the time of mounting. The shorter the liquid flow distance, the higher the evaluation.

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.

As shown in Tables 1 and 2, the liquid remaining amount of Comparative Example 1 which did not contain a liquid film cleaving agent was 265 mg. On the other hand, the amount of remaining liquid in Examples 1 to 12 containing a liquid film cleaving agent was less than half of the remaining amount of liquid in Comparative Example 1, and it was confirmed that the liquid film was effectively cleaved.
Further, in Comparative Example 2 in which the liquid film cleaving agent was contained on the entire surface, the liquid remaining amount was 73 mg, whereas the liquid flow length was 70 mm, which was more than twice the liquid flow length of 33 mm in Comparative Example 1. Met. That is, in Comparative Example 2, there was a decrease in the liquid residue due to the liquid film cleavage, while the liquid flow on the nonwoven fabric surface was deteriorated, and the liquid flow preventing property was reduced. On the other hand, in Examples 1 to 12, the liquid flow length was 17% or more shorter than that in Comparative Example 2, and the liquid flow prevention property was improved. That is, Examples 1 to 12 achieved both improvement of liquid residue reduction and improvement of liquid flow prevention, which Comparative Examples 1 and 2 could not achieve.
Furthermore, in Examples 2 to 5, 11 and 12, the liquid flow length of Example 2 in which the area ratio of the containing part / non-containing part in a square having a side of 5 mm was 1 or less was 54 mm, whereas The liquid flow lengths of Examples 3 to 5, 11 and 12 in which the area ratio was larger than 1 were suppressed to be 20% or less of the liquid flow length of Example 2. In other words, it was found that when the area ratio is larger than 1, the effect of preventing liquid flow is high in addition to the effect of reducing liquid residue. In addition, in Examples 1, 3 to 5 and 10 to 12, the liquid flow length of Example 1 in which the sum of the widths of the adjacent containing portion and the non-containing portion was more than 2500 μm was 58 mm. On the other hand, the liquid flow lengths of Examples 3 to 5 and 10 to 12 in which the sum of the widths was 2500 μm or less were suppressed to be as short as 30% or more. That is, it was found that when the sum of the widths is 2500 μm or less, the effect of preventing liquid flow is high in addition to the effect of reducing liquid residue.

While the invention has been described in conjunction with embodiments and examples thereof, it is not intended that the invention be limited in any detail to the description, unless otherwise specified, and that the spirit and nature of the invention as set forth in the appended claims be considered as such. I think it should be interpreted broadly without violating the scope.

This application claims priority based on Japanese Patent Application No. 2016-109602 filed in Japan on May 31, 2016, which is hereby incorporated herein by reference. Capture as part.

DESCRIPTION OF SYMBOLS 1 Fiber 2 Liquid film 3 Liquid film cleaving agent 6 Containing part 7 Non-containing part 8 Square 9 Interface 5, 10, 20, 30, 40, 50, 60, 70 Nonwoven fabric

Claims (44)

1. The nonwoven fabric surface has a containing part containing a liquid film cleaving agent and a non-containing part not containing the liquid film cleaving agent, and one side with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when the square of 5 mm is divided.
2. The nonwoven fabric according to claim 1, 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.
3. The nonwoven fabric surface has a containing part containing the following compound C1 and a non-containing part not containing the following compound C1, and a square having a side of 5 mm with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged. The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when partitioning.
   [Compound C1]
   A compound having an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
4. The expansion coefficient of the liquid film cleaving agent or the compound C1 is more preferably 20 mN / m or more, further preferably 25 mN / m or more, and particularly preferably 30 mN / m or more.
5. The interfacial tension of the liquid film cleaving agent or the compound C1 with respect to a liquid having a surface tension of 50 mN / m is preferably 20 mN / m or less, more preferably 17 mN / m or less, still more preferably 13 mN / m or less, and 10 mN / m. The non-woven fabric according to any one of claims 2 to 4, wherein the non-woven fabric according to any one of claims 2 to 4, wherein the non-woven fabric is more preferably at most 9 mN / m, particularly preferably at most 1 mN / m, and more than 0 mN / m.
6. The liquid film cleaving agent or the compound C1 is composed of a compound having at least one structure selected from the group consisting of the following structures X, XY, and YXY. The nonwoven fabric of Claim 1.
   Structure X is> C (A)-<C represents a carbon atom. <,>, And-indicate 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 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 , -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.
7. The liquid film cleaving agent or the compound C1 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 The nonwoven fabric according to any one of claims 1 to 6.
8. The liquid film cleaving agent or the compound C1 is composed of 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 nonwoven fabric according to any one of claims 1 to 7, 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 a carbon number of 1 to 20, 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. Note that the symbols of these repeating units are determined separately in each of the formulas [I] to [IV], and do not necessarily indicate the same integer, and may be different.
9. The expansion factor for a liquid having a surface tension of 50 mN / m of the liquid film cleaving agent is greater 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. Non-woven fabric.
10. The nonwoven fabric surface has a containing part containing the following compound C2 and a non-containing part not containing the following compound C2, and a square having a side of 5 mm with respect to the nonwoven fabric surface on which the containing part and the non-containing part are arranged. The nonwoven fabric which has one or more interfaces of the said containing part and the said non-containing part in this square area | region when partitioning.
    [Compound C2]
    A compound having 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.
11. The interfacial tension of the liquid film cleaving agent or the compound C2 with respect to a liquid having a surface tension of 50 mN / m is preferably 17 mN / m or less, more preferably 13 mN / m or less, still more preferably 10 mN / m or less, and 9 mN / m. The nonwoven fabric according to claim 9 or 10, wherein the following is particularly preferred, 1 mN / m or less is particularly preferred and greater than 0 mN / m.
12. The expansion coefficient of the liquid film cleaving agent or the compound C2 with respect to a liquid having a surface tension of 50 mN / m is preferably 9 mN / m or more, more preferably 10 mN / m or more, further preferably 15 mN / m or more, and 50 mN / m. The nonwoven fabric according to any one of claims 9 to 11, which is:
13. The liquid film cleaving agent or the compound C2 comprises a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY: The nonwoven fabric of any one of Claims.
    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 are combined Represents a hydrocarbon chain of structure. At the terminal 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 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. 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.
    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.
14. The liquid film cleaving agent or the compound C2 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] and having a mass average molecular weight of 1000 or more. The nonwoven fabric according to any one of claims 1 and 9 to 13, 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. .
    

    

    

    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. Note that “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.
15. The liquid film cleaving agent or the compound C2 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 nonwoven fabric according to any one of claims 1 and 9 to 13, comprising at least one kind.
    

    

    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 in} —COOC _m H _n represents an alcohol-derived hydrocarbon group that forms an ester.
    

    

    In formula [XV], m and n are each independently an integer of 1 or more.
16. The nonwoven fabric according to any one of claims 1 to 15, wherein the square region is arranged at a position to be a liquid receiving portion.
17. When the nonwoven fabric is applied as a surface sheet of a paper diaper or a daytime napkin, the liquid receiving part is a central portion in the longitudinal direction and the width direction of the paper diaper or the daytime napkin, and the nonwoven fabric is used as a surface sheet of a nighttime napkin. When applied, the nonwoven fabric according to claim 16, which is a central portion in the longitudinal direction and the width direction in the second region from the front when the night napkin is divided into four in the longitudinal direction.
18. The nonwoven fabric according to any one of claims 1 to 17, wherein a plurality of the interfaces exist in the square region.
19. The nonwoven fabric according to any one of claims 1 to 18, wherein an area ratio of the containing part to the non-containing part is larger than 1 in the square region.
20. 20. The square according to any one of claims 16 to 19, wherein at least one square having an area ratio of the containing part to the non-containing part larger than 1 is arranged at any position in the longitudinal direction of the nonwoven fabric from the liquid receiving part. The nonwoven fabric described in 1.
21. The area ratio, that is, the area of the containing part / the area of the non-containing part is more than 1 and 16 or less, preferably 1.3 or more, more preferably 1.5 or more, more preferably 10 or less, and more preferably 3 or less. The nonwoven fabric according to claim 19 or 20, which is preferable.
22. 21. The nonwoven fabric according to claim 19 or 20, wherein the area ratio, that is, the area of the containing part / the area of the non-containing part is 1.5 or more and 3 or less.
23. The nonwoven fabric according to any one of claims 1 to 22, wherein the containing part and the non-containing part are periodically arranged on the surface of the nonwoven fabric.
24. The inclusion part and the non-contained part both extend in a band shape in the longitudinal direction, and the band-like inclusion part and the non-contained part are alternately arranged in the width direction. The nonwoven fabric described.
25. The inclusion portion has a circular shape, and the inclusion portions are plurally spaced apart from each other along both the longitudinal direction and the width direction, and are dispersedly arranged in a plurality of directions. The nonwoven fabric described.
26. The nonwoven fabric according to any one of claims 1 to 23, wherein the containing portion is composed of a plurality of geometrical lines, and the portion between the containing portions is the non-containing portion.
27. The nonwoven fabric according to any one of claims 1 to 23, wherein the non-containing part is composed of a plurality of geometrical lines, and a space between the non-containing parts is the containing part.
28. The nonwoven fabric according to any one of claims 1 to 27, wherein the sum of the widths of the adjacent containing part and the non-containing part is 2500 μm or less.
29. The sum of the widths of the adjacent containing part and the non-containing part is 100 μm or more and 2500 μm or less, preferably 2000 μm or less, more preferably 1500 μm or less, more preferably 500 μm or more, and more preferably 1000 μm or more. The nonwoven fabric according to 28.
30. The nonwoven fabric according to claim 28, wherein the sum of the widths of the containing part and the non-containing part adjacent to each other is 1000 µm or more and 1500 µm or less.
31. The nonwoven fabric according to any one of claims 1 to 30, wherein a contact angle of the constituent fibers of the containing part is larger than a contact angle of the constituent fibers of the non-containing part.
32. 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 70 degrees or less, preferably 10 degrees or more, more preferably 20 degrees or more, and 50 degrees. The nonwoven fabric according to claim 31, wherein the nonwoven fabric is preferably at most 30 ° or less.
33. The non-woven fabric according to claim 31, wherein a difference between a contact angle of constituent fibers of the containing part and a contact angle of constituent fibers of the non-containing part is 20 degrees or more and 30 degrees or less.
34. 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 further preferably 70 degrees or less, any one of claims 31 to 33. The nonwoven fabric described in 1.
35. The contact angle of the constituent fibers of the containing part is preferably 110 degrees or less, more preferably 90 degrees or less, and further preferably 80 degrees or less, according to any one of claims 31 to 34. The nonwoven fabric described.
36. The nonwoven fabric according to any one of claims 1 to 35, wherein water solubility of the liquid film cleaving agent, the compound C1 or the compound C2 is 0 g or more and 0.025 g or less.
37. The surface tension of the liquid film cleaving agent, the compound C1 or the compound C2 is preferably 32 mN / m or less, more preferably 30 mN / m or less, still more preferably 25 mN / m or less, particularly preferably 22 mN / m or less, and 1 mN. The nonwoven fabric according to any one of claims 1 to 36, which is preferably at least / m.
38. The nonwoven fabric according to any one of claims 1 to 37, wherein the nonwoven fabric has an uneven shape having a convex portion and a concave portion.
39. The nonwoven fabric according to claim 38, wherein a top portion of the convex portion has the containing portion.
40. 40. The nonwoven fabric according to claim 38 or 39, wherein the bottom of the recess has the non-containing part.
41. The nonwoven fabric according to claim 38, wherein the convex portion and the containing portion are matched, and the concave portion and the non-containing portion are matched.
42. The nonwoven fabric according to any one of claims 1 to 41, wherein the liquid film cleaving agent, the compound C1, or the compound C2 is localized near at least some of the fiber entanglement points or fiber fusion points.
43. An absorbent article using the nonwoven fabric according to any one of claims 1 to 42 as a surface sheet.
44. 44. The absorbent article according to claim 43, wherein the absorbent article is a sanitary napkin.

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