RU2698821C1 - Laminated non-woven material - Google Patents

Abstract

FIELD: non-woven materials.

SUBSTANCE: invention relates to sanitary-hygienic non-woven materials, particularly, to laminated non-woven material. Using the disclosed material, fluid films formed between the fibers are reduced to realize a dry skin sensation at a higher level. Laminated non-woven material comprises two layers of fibers located nearby, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than degree of hydrophilicity of another layer of fibers, and laminated nonwoven material comprises an agent for destroying a film of liquid in at least one layer of fibers.

EFFECT: invention provides creation of a non-woven material preferably as an upper sheet of the absorbent article, which can satisfy both sensation of dry skin, and sensation of a soft texture at a high level.

28 cl, 18 dwg, 1 tbl, 8 ex

Description

FIELD OF THE INVENTION

{0001}

The present invention relates to a laminated nonwoven material.

State of the art

{0002}

Regarding the non-woven material used in the top sheet of the absorbent article, and the like, attempts are made to improve the feeling of dry skin by increasing the force of suction of the liquid in the non-woven material using a gradient of the degree of hydrophilicity (for example, Patent Literature 1 and 2). In addition, to improve the feeling of dry skin, attempts are made to introduce a blood modifier into the top sheet. This blood modifier is used to reduce the viscosity and surface tension of blood to stabilize blood cells, thereby preventing the easy formation of coin columns from blood cells to facilitate the absorption of menstrual blood into the absorbent mass (e.g., Patent Literature 3).

Citation List

Patent Literature

{0003}

Patent Literature 1: JP-A-2005-319042 (“JP-A” means Japanese Unexamined Published Patent Application)

Patent Literature 2: JP-A-2014-224338

Patent Literature 3: JP-A-2013-63245

SUMMARY OF THE INVENTION

{0004}

The present invention provides a laminated non-woven material comprising two layers of fibers arranged side by side, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated non-woven material contains an agent for breaking a liquid film of at least , in one layer of fibers.

{0005}

Other and further objects, features and advantages of the present invention will become more apparent from the following description with corresponding references to the accompanying drawings.

Brief Description of the Drawings

{0006}

{FIG. one}

FIG. 1 is a cross-sectional view of a laminated nonwoven fabric of a preferred embodiment (first embodiment and second embodiment) according to the present invention.

{FIG. 2}

FIG. 2 is a schematic view showing a liquid film formed in an intermediate space between fibers of a laminated nonwoven material.

{FIG. 3}

Figures 3 (A1) to 3 (A4) each are explanatory drawings schematically showing from the side a state in which an agent for breaking a liquid film destroys a liquid film, and Figures 3 (B1) to 3 (B4) each are explanatory drawings schematically showing from above a state in which an agent for breaking a liquid film destroys a liquid film.

{FIG. four}

FIG. 4 is a cross-sectional view of a nonwoven fabric showing a preferred aspect (first aspect) of the shape of a laminated nonwoven fabric according to the present invention.

{FIG. 5}

FIG. 5 is a general view schematically showing another preferred aspect (second aspect) of the shape of the laminated nonwoven material by partially cutting surfaces according to the present invention.

{FIG. 6}

FIG. 6 is a perspective view schematically showing yet another preferred aspect (third aspect) of the shape of the laminated nonwoven material by partially cutting the surface according to the present invention.

{FIG. 7}

FIG. 7 is a perspective view schematically showing another preferred aspect (fourth aspect) of the shape of the laminated nonwoven fabric according to the present invention.

{FIG. 8}

FIG. 8 is a perspective view schematically showing a preferred aspect (fifth aspect) of a nonwoven sheet as a fiber layer in two fiber layers of a laminated nonwoven according to the present invention.

{FIG. 9}

FIG. 9 is an explanatory drawing schematically showing a state in which the constituent fibers of the nonwoven sheet shown in FIG. 8 are fixed to each other in fusion-related parts.

{FIG. 10}

FIG. 10 is a perspective view schematically showing another preferred aspect (sixth aspect) of the shape of a laminated nonwoven fabric according to the present invention.

{FIG. eleven}

FIG. 11 is a perspective view schematically showing another preferred aspect (seventh aspect) of the shape of a laminated nonwoven fabric according to the present invention.

Description of Embodiments

{0007}

The present invention relates to a laminated non-woven material by which the liquid films formed between the fibers are reduced in order to realize a feeling of dry skin at a higher level. In addition, the present invention relates to a laminated non-woven material, preferred as the top sheet of an absorbent article, which can satisfy both a dry skin sensation and a high-level soft texture sensation.

{0008}

In the nonwoven materials used for the upper sheets, and the like, there are narrow areas between the fibers. In such an area, although there is a space into which the excreted fluid can penetrate (for example, urine and menstrual blood, also referred to below simply as fluid), the high meniscus force between the fibers, the high surface activity of the plasma proteins or the high surface viscosity of the blood cause stable fluid films between the fibers, resulting in fluid retention in this area. This liquid film is formed in a stable film in a narrow region between the fibers, and for this reason, if a liquid film is once formed, the liquid film is difficult to dissolve even using a gradient of the degree of hydrophilicity or a blood modifier to stabilize blood cells.

For this reason, the sensation of dryness of the skin of the user is not achieved sufficiently even in non-woven material that uses a conventional blood modifier or the like, to date. In addition, in addition to the feeling of dry skin, consumers have recently also shown wishes for a relatively soft texture, which requires the use of thin fibers. However, if thin fibers are used, the distance between the fibers is further reduced. Thus, since a liquid film between the fibers is even easier to form and more difficult to break, fluid retention tends to increase.

Furthermore, this phenomenon is not limited to blood as a liquid intended to be absorbed, and phospholipids in urine also exhibit surface activity in which a liquid film is formed in a manner similar to that described above, so that the feeling of dry skin is still not satisfied. Thus, attempts to eliminate a liquid film formed in a narrow portion between the fibers in the nonwoven fabric are considered, and drawing the liquid film into the absorbent mass is considered, but this elimination is difficult due to the high stability of the liquid film. However, it is also contemplated to eliminate a liquid film by using a water-soluble surfactant to reduce the surface tension of the liquid. However, when an attempt is made to make it possible to remove a liquid film using such a surfactant in an absorbent article, the liquid is prone to penetrate through the backing sheet to protect against liquid leakage.

{0009}

The laminated nonwoven material of the present invention reduces the formation of a liquid film between the fibers to realize a higher level of dry skin sensation. Furthermore, by using the laminated non-woven material according to the present invention, an absorbent article can be obtained that can satisfy both the feeling of dry skin and the softness of the texture at a high level.

{0010}

The laminated non-woven material according to the present invention contains two layers of fibers arranged side by side, where one layer of fibers in these two layers of fibers has a higher degree of hydrophilicity than the degree of hydrophilicity of the other layer of fibers, and the laminated non-woven material contains an agent for breaking a liquid film of at least , in one layer of fibers.

In addition, the laminated non-woven material according to the present invention contains two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a higher degree of hydrophilicity than the degree of hydrophilicity of the other layer of fibers, and the laminated non-woven material contains a compound having solubility in water 0 g or more and 0.025 g or less, and a spreading coefficient of 16 mN / m or more, for a liquid having a surface tension of 50 mN / m in at least one layer of fibers.

In addition, the laminated non-woven material according to the present invention contains two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a higher degree of hydrophilicity than the degree of hydrophilicity of the other layer of fibers, and the laminated non-woven material contains a compound having solubility in water 0 g or more and 0.025 g or less, the spreading coefficient is more than 0 mN / m, for a liquid having a surface tension of 50 mN / m, and the tension at the interface is 20 mN / m or less, for liquids and having a surface tension of 50 mN / m, at least one layer of fibers.

{0011}

Liquid film disruption agent means an agent that inhibits the formation of a liquid film by disrupting a liquid film formed between the fibers or on the surface of the fibers of a nonwoven material when a liquid, for example, an excreted liquid, such as a high viscosity liquid, including menstrual blood or urine, enters contact with the laminated non-woven material, and has the effect of destruction of the formed liquid film and the effect of inhibiting the formation of the liquid film. The destruction of the liquid film is achieved by the action of the agent for the destruction of the liquid film, which forces a part of the layer of the liquid film to destabilize this part. This effect of the agent for breaking the liquid film facilitates the passage of liquid through the laminated non-woven material without being held in a narrow region between the fibers of the laminated non-woven material. That is, between the fibers of the nonwoven material, a laminated nonwoven fabric is formed which is excellent in liquid permeability. Thus, even if the fibers that make up the laminated non-woven material are made narrower, to reduce the distance between the fibers, both softness of the texture and suppression of the retention of residual liquid are achieved. Such a laminated non-woven fabric may be used, for example, in the form of a top sheet of an absorbent article such as a sanitary napkin, a baby diaper or an incontinence adult diaper.

{0012}

(Liquid film removal properties)

The liquid film disruption agent used in the present invention has liquid film deletion properties, and due to such properties, the liquid film disruption agent can develop the effect of liquid film deletion when the liquid film disruption agent is applied to the test liquid, mainly containing component of plasma or artificial urine (mixed at fractions of 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, 0.010% by weight of cr meat № 2 (Dye), about 96.88% by weight water, and about 0.07% by weight of a simple polyoxyethylene lauryl ether, wherein the surface tension is regulated at 53 ± 1 dyn / cm (23 ° C)). The effect of eliminating a liquid film in this document includes, with respect to a structure in which air is held by a liquid film formed from a test liquid or artificial urine, both the effect of inhibiting the formation of a liquid film of the structure and the effect of eliminating the formed structure, and it can be said that the agent , developing at least one effect, has properties in accordance with which it is possible to develop the effect of eliminating the liquid film.

The test fluid is a fluid component recovered from defibrinated horse blood (manufactured by NIPPON BIO-TEST LABORATORIES INC.). Specifically, if 100 ml of defibrinated horse blood is left to stand at 22 ° C and a humidity of 65% for 1 hour, the defibrinated horse blood is divided into the upper layer and the lower layer, while this upper layer is the test fluid. The upper layer contains mainly the plasma component, and the lower layer contains mainly the blood cell component. To select only the upper layer from defibrinated horse blood, which is divided into the upper layer and the lower layer, you can use, for example, Transfer Pipet (manufactured by Nippon Micro K.K).

Whether a particular agent has `` liquid film removal properties '' can be judged by a large or small amount of a structure, namely, a liquid film, when a state of easy formation of a structure is formed in which the structure contains air held therein by means of a liquid film formed from the test fluid or artificial urine to which the agent is applied. That is, a standard sample is obtained by bringing the temperature of the test liquid or artificial urine to 25 ° C, and then placing 10 g of it in a bottle with a cap on the thread (manufactured by Maruemu Corporation, No. 5, outer diameter: 27 mm, total length: 55 mm ) In addition, as a measurement sample, a material is prepared by adding 0.01 g of an agent for the measurement purpose, which is previously adjusted to 25 ° C., to an aliquot identical to the standard sample. After vigorous shaking of the standard sample and the sample for measuring back and forth in the vertical direction of the bottle with a cap on the thread, twice, respectively, the samples are directly placed on a horizontal plane. A liquid layer (lower layer) without structure and a structure layer (upper layer) formed from a large number of structures formed on the liquid layer are formed inside the bottle with a cap on the thread after shaking by shaking the samples. After passing 10 seconds from the end time of shaking, the height of the layer of structures (height from the liquid level of the liquid layer to the upper surface of the layer of structures) is measured for both samples. Then, when the height of the layer of structures of the sample for measurements reaches 90% or less with respect to the height of the layer of structures of the standard sample, the target agent for measurements is considered as an agent that affects the destruction of the liquid film.

The liquid film disruption agent used in the present invention is an agent satisfying these properties (an agent that can develop liquid film disruption) using a single compound satisfying these properties, a combination of a plurality of individual compounds satisfying these properties, or a combination of a plurality compounds. That is, an agent for destroying a liquid film means only an agent limited to a material having an effect on the destruction of a liquid film according to the definition. Accordingly, when the third component, which does not meet the definition, is contained in the compound used in the agent for treating fibers in a nonwoven material, such an agent is different from an agent for destroying a liquid film.

In addition, with respect to a liquid film disruption agent and a third component, “separate compound” means a compound in a concept including a compound that has the same compositional formula but has a different molecular weight due to the difference in the number of repeating units.

{0013}

The agent for breaking the liquid film is applied to the constituent fibers, at least in some areas of the laminated non-woven material, and is retained. At least some of the areas on which the agent is applied are preferably areas where a particularly large amount of liquid is received. For example, when the laminated nonwoven material of the present invention is processed into a top sheet of an absorbent article, such as a sanitary napkin, the coated area is the area corresponding to the area of the wearer’s discharge where fluid to be released, such as menstrual blood, is received. Furthermore, with respect to the thickness direction of the laminated non-woven material according to the present invention, the disruption agent is preferably contained in at least a layer on the liquid receiving side (a layer near the skin on an absorbent article). In the top sheet of the above example, an agent for disrupting a liquid film is contained at least in some place on the side of the skin contact surface in contact with the skin of the user.

{0014}

As defined with respect to the present invention, the expression “laminated nonwoven fabric contains or has an agent for breaking a liquid film” means that the agent for breaking a liquid film mainly adheres to the surface of the fibers. However, insofar as the agent for destroying the liquid film continues to be present on the surface of the fibers, it is also acceptable that the agent for destroying the liquid film is present inside the fibers or is present inside the fibers by internal administration. As a method for adhering an agent to break a liquid film to the surface of the fibers, any commonly used methods can be used without any limitation. Specific examples of the methods include spray coating, coating using a slotted coating device, coating using a transfer roller, and immersion. Such processing may be applied to the fibers prior to forming as a web, or may be applied after forming the fibers as a web using any of various methods. Fibers, on the surface of which an agent is used to break the liquid film, are dried, for example, using a dryer with a hot air pressurization, at a temperature significantly lower than the melting temperature of the fiber resin (for example, 120 ° C or less). In addition, when the agent for destroying the liquid film is bonded to the fibers using the bonding method described above, this bonding is accomplished by using a solution containing the agent for destroying the liquid film prepared by dissolving the agent for destroying the liquid film in a solvent, if necessary, or a liquid emulsion or a liquid dispersion of an agent for breaking a liquid film.

In order for the liquid film disruption agent of the present invention to exhibit the effect of the liquid film disruption described below on the nonwoven material, the liquid film disruption agent must be present in a fluid state when the liquid film disruption agent is in contact with the body fluid. Because of this, the melting point of the liquid film breaking agent of the present invention is preferably 40 ° C or less, and more preferably 35 ° C or less. In addition, the melting point of the liquid film breaking agent of the present invention is preferably -220 ° C or more, and more preferably -180 ° C or more.

{0015}

In the laminated nonwoven material of the present invention, the agent for breaking the liquid film acts on it as a driving force for breaking and destabilizing a thin and stable film of liquid that occurs in a narrow region between the fibers. Moreover, the difference in the degree of hydrophilicity between adjacent layers of fibers acts on it as a driving force for suction of a liquid in a destabilizing state under the action of fracture from a fiber layer having a lower degree of hydrophilicity into a fiber layer having a higher degree of hydrophilicity, in one direction until the liquid stabilizes again on the surface of the fiber. In addition, even if a slight backflow of liquid is caused by pressure or the like, the agent for breaking the liquid film inhibits the formation of a stable liquid film by pumping the liquid back into the layer having a higher degree of hydrophilicity.

Thus, the driving forces caused by both the agent for the destruction of the liquid film and the difference in the degree of hydrophilicity between adjacent layers of fibers interact to inhibit stabilization of the liquid between the fibers, thereby increasing the permeability of the liquid in the direction along the thickness of the liquid in the laminated non-woven material to suppress residual liquids. Thus, the laminated non-woven material is imparted liquid permeability by which the laminated non-woven material can quickly respond also to a new fluid intake. In addition, a laminated nonwoven fabric obtained using thin fibers and having a soft texture, while at the same time maintaining a dry skin feel at a high level, can be formed using these characteristics.

{0016}

In addition, the proximity of one fiber layer to another fiber layer in “two layers of fibers adjacent” is not limited to an aspect in which two layers of fibers are in complete contact with each other, and may correspond to an aspect in which two layer of fibers have a part peeled from them. For example, two layers may have a hollow portion having a space between two layers of fibers.

{0017}

Preferred embodiments of the laminated nonwoven fabric of the present invention will be described below.

{0018}

As shown in FIG. 1, the laminated nonwoven fabric 10 of the first embodiment comprises two layers, namely, a first fiber layer 11 on the side of the first surface 1A and a second fiber layer 12 on the side of the second surface 1B adjacent thereto. The degree of hydrophilicity of the second fiber layer 12 is controlled to be higher than the degree of hydrophilicity of the first fiber layer 11. Thus, a gradient of the degree of hydrophilicity is formed, increasing from the first layer 11 of fibers to the second layer 12 of fibers in the direction along the thickness of the laminated non-woven material 10, and this acts on it as a driving force for suctioning the liquid, as discussed above. When the laminated nonwoven material 10 is used as the top sheet of an absorbent article, it is preferable to use a surface on the side of the second surface 1B having a higher degree of hydrophilicity as a surface without contact with the skin.

In addition, the laminated non-woven material 10 may further have any other layer in addition to these two layers.

{0019}

Unless otherwise specified, the hydrophilicity gradient described above means a state in which, compared with the hydrophilicity degree on the side of the liquid receiving surface (for example, the surface in contact with the skin, when the laminated non-woven material is used as the top sheet of a diaper or something similar), the degree of hydrophilicity on the side of the surface opposite to it (for example, the surface without contact with the skin in the top sheet) in the direction along the thickness of the laminated non-woven material above. This “gradient” broadly includes various aspects in which there is a difference in the degree of hydrophilicity between the liquid receiving side and the surface side opposite to it, and it can exist in an aspect in which the degree of hydrophilicity increases gradually, or in an aspect in which the degree of hydrophilicity increases stepwise.

{0020}

In addition to the hydrophilicity gradient described above, the laminated non-woven material 10 contains, in at least one of the fiber layers, a liquid film disruption agent, which is a compound in which a spreading coefficient for a liquid having a surface tension of 50 mN / m, is 16 mN / m or more; and solubility in water is 0 g or more and 0.025 g or less. An agent for destroying a liquid film may be present in the first fiber layer 11 serving as a layer on the liquid receiving side, or may be present in the second fiber layer 12 on the suction side of the liquid from the first fiber layer 11. In addition, an agent for destroying a liquid film may be present both in the first fiber layer 11 and in the second fiber layer 12. It is preferred that the liquid film disruption agent is present in at least the first fiber layer 11, since residual liquid can effectively be prevented from flowing on a side near the skin. In addition, if the agent for destroying the liquid film is present in at least the first layer of fiber 11, even after the destruction of the liquid film, the agent for destroying the liquid film additionally migrates to the second layer 12 of fibers together with the liquid, and it can carry out the effect of destruction of the film liquids in this position, and therefore, such a case is preferred.

{0021}

The term `` spreading coefficient for a liquid having a surface tension of 50 mN / m, '' for an agent for disrupting a liquid film means a spreading coefficient for a liquid in the case where an excreted fluid such as menstrual blood and urine is described as described above. '' Spreading coefficient '' means a value that must be determined on the basis of the following expression (1), described below, and from the measured value obtained using the measurement method described below, in the range corresponding to the environment, at a temperature of 25 ° C and relative humidity (RH) 65%. In addition, the liquid film in the expression (1) means the liquid phase of the `` liquid having a surface tension of 50 mN / m, '' including both the liquid in the state in which the film is formed between the fibers or on the surface of the fibers, and the liquid in the state before the formation of the film, which is also referred to simply as a liquid. In addition, the surface tension in the expression (1) means the tension at the interface, at the interface of the liquid film and the agent for destruction of the liquid film, respectively, with the gas phase, and it differs from the tension at the interface of the agent for destruction of the liquid film and the liquid film between the liquid phases. The same rule of accounting for such differences also applies to other descriptions in this document.

γ _w : surface tension of a film of liquid (s).

γ _o : surface tension of the agent to destroy the liquid film.

γ _wo : tension at the interface of an agent to destroy a liquid film and a liquid film.

{0022}

As is known from expression (1), the spreading coefficient (S) of the agent for destroying the liquid film increases when the surface tension (γ _o ) of the agent for destroying the liquid film decreases and when the tension at the interface (γ _wo ) of the agent for destroying the liquid film decreases and liquid films. When the spreading coefficient is 16 mN / m or more, the agent for breaking the liquid film has high mobility, namely, a high diffusion coefficient, on the surface of the liquid film forming in a narrow region between the fibers. From this point of view, the spreading coefficient of the agent for breaking the liquid film is preferably 20 mN / m or more, more preferably 25 mN / m or more, and even more preferably 30 mN / m or more. On the other hand, its upper limit is not limited in any way, but according to expression (1), the surface tension of the liquid that forms the liquid film serves as the upper limit of the spreading coefficient of the agent for destruction of the liquid film, thus, the upper limit is 50 mN / m, when a liquid having a surface tension of 50 mN / m is used, the upper limit value is 60 mN / m, when a liquid having a surface tension of 60 mN / m is used, and the upper limit value is It is 70 mN / m when a liquid having a surface tension of 70 mN / m is used. For this reason, from the point of view of using a liquid having a surface tension of 50 mN / m in the present invention, the upper limit is 50 mN / m or less.

{0023}

The term “water solubility” of a liquid film disintegrating agent means a mass of a liquid film disintegrating agent that dissolves in 100 g of deionized water and is a value that must be measured in a range appropriate to the environment at a temperature of 25 ° C. and relative humidity (RH) 65%, based on the measurement method described later. When this solubility in water is 0 g or more and 0.025 g or less, the agent for destroying the liquid film is poorly soluble and forms an interface with the liquid film, making the diffusion described above more effective. From a similar point of view, the water solubility of the liquid film disrupting agent is preferably 0.0025 g or less, more preferably 0.0017 g or less, and even more preferably less than 0.0001 g. In addition, water solubility is preferably less, and it is 0 g or more, and from the point of view of diffusion on the liquid film, the solubility in water is practically regulated at 1.0 × 10 ^-9 g or more. In addition to this, solubility in water is also believed to apply to menstrual blood, urine or the like, which contains water as the main component.

{0024}

The surface tension (γ _w ) of a liquid film (liquid having a surface tension of 50 mN / m), the surface tension (γ _o ) of an agent for breaking a liquid film, the tension at the interface (γ _wo ) of an agent for breaking a liquid film with respect to a liquid film and the water solubility of the liquid film breaking agent is measured using the following methods.

In addition, when the laminated non-woven fabric of the measurement object is an element (e.g., a top sheet) assembled in an absorbent product, such as a sanitary towel and a disposable diaper, the laminated non-woven material is removed as described below and measured. That is, an adhesive or the like that is used to bond between the element of the measurement object and other elements in the absorbent article is weakened by means of cooling means, such as spraying a coolant, and then the measurement object element is carefully peeled off and prepared. This removal method is used in the measurement associated with the laminated nonwoven material of the present invention, such as fiber spacing and fineness measurements, which will be discussed later.

In addition, when a liquid film disruption agent is measured that is adhered to the fibers, the fibers to which the liquid film disruption agent adheres are first washed with a washing liquid such as hexane, methanol and ethanol, then a solvent (washing solvent containing a film breaking agent liquid) used for washing, dried to release an agent for breaking the film of liquid. The mass of the extracted substance this time is used in calculating the proportion of the content (OPU) of the agent to destroy the liquid film relative to the weight of the fibers. When the amount of the isolated substance is not enough to measure surface tension or the tension at the interface, choose the appropriate column and the appropriate solvent in accordance with the components of the selected substance, and then each component is fractionated using high-performance liquid chromatography, and then MS measurement, NMR spectroscopy, and elemental analysis are performed. or something similar on each fraction to identify the structure of each fraction. In addition, when the agent for breaking the liquid film contains a polymer compound, a technique such as gel permeation chromatography (GPC) is used to further simplify the identification of the component. Then, a sufficient amount is obtained by purchase, if the substance is a commercial product, or by synthesis, if the substance is not a commercial product, to measure surface tension or tension at the interface. In particular, regarding the measurement of surface tension and the tension at the interface, when the agent for destroying the liquid film obtained as described above is a solid product, the agent for destroying the liquid film is heated to the melting temperature of the agent for breaking the liquid film plus 5 ° C, to cause a phase transition into a liquid, and the measurement is carried out while maintaining these temperature conditions.

{0025}

(Method for measuring surface tension (γ _w ) of a liquid film (s))

In the range corresponding to the environment, at a temperature of 25 ° C and a relative humidity (RH) of 65%, the measurement can be carried out using a platinum pallet using the pallet method (Wilhelmy method). As a measurement device for the above case, an “CBVP-Z” automatic surface tension measuring device (trade name, manufactured by Kyowa Interface Science Co., Ltd.) can be used. As a platinum pallet, a pallet having a purity of 99.9% and dimensions of 25 mm in width and 10 mm in length is used.

In the next measurement that relates to the agent for destroying a liquid film, a solution is used as the `` liquid having a surface tension of 50 mN / m '' described above, the solution being prepared by adding polyoxyethylene sorbitan monolaurate to deionized water (e.g., trade name '' Leodol Super TW-L120, '' manufactured by Kao Corporation), which is a non-ionic surfactant, and regulates surface tension to 50 ± 1 mN / m.

{0026}

(Method for measuring the surface tension (γ _o ) of an agent for breaking a liquid film)

The measurement can be carried out using the same device using the pallet method, in the same way as for measuring the surface tension (γ _w ) of a liquid film, in the range corresponding to the environment, at a temperature of 25 ° C and a relative humidity (RH) of 65% . In this measurement, as discussed above, when the obtained liquid film destruction agent is solid, the liquid film destruction agent is heated to a melting point of the liquid film destruction agent plus 5 ° C. to cause a phase transition into the liquid, and measurements are carried out while maintaining these temperature conditions.

{0027}

(Method for measuring the tension at the interface surface (γ _wo ) of an agent for destruction of a liquid film and a liquid film)

In the range corresponding to the environment, at a temperature of 25 ° C and a relative humidity (RH) of 65%, the measurement can be carried out using the hanging drop method. In the above case, an automatic device for measuring viscoelasticity at the interface can be used as a measuring device (trade name `` THE TRACKER, '' is made by TECLIS-IT CONCEPT; or trade name is `` DSA25S, '' is made by KRUSS). In the hanging drop method, the adsorption of a non-ionic surfactant contained in a liquid having a surface tension of 50 mN / m begins simultaneously with the formation of the drop, and the tension at the interface decreases with time. For this reason, the tension on the interface is recorded when a drop is formed (at 0 seconds). In addition, in this measurement, as discussed above, when the obtained liquid film disintegrating agent is solid, the liquid film disintegrating agent is heated to the melting temperature of the liquid film disintegrating agent plus 5 ° C to cause a phase transition into the liquid, and the measurement is carried out while maintaining these temperature conditions.

In addition, when measuring the tension at the interface, when the density difference between the agent for destruction of the liquid film and the liquid having a surface tension of 50 mN / m is very small, when the viscosity is very high or when the value of tension on the interface is equal to or less, than the measurement limit for a hanging drop, in some cases, measuring the tension at the interface using the hanging drop method becomes difficult. In this case, the measurement can be carried out using the method of a rotating drop in the range corresponding to the environment, at a temperature of 25 ° C and a relative humidity (RH) of 65%. As a measuring device in the above case, you can use a device for measuring the tension on the interface with a rotating drop (trade name `` SITE100, '' is made by KURUSS). In addition, also with respect to the measurement, the tension at the interface is recorded when the droplet shape is stabilized, and when the obtained agent for breaking the liquid film is solid, the agent for breaking the liquid film is heated to the melting temperature of the agent for breaking the liquid film plus 5 ° C to phase transition into a liquid, and the measurement is carried out, maintaining these temperature conditions.

In addition, when the tension on the interface can be measured using both measuring devices, a lower value of tension on the interface is used as the measurement results.

{0028}

(Method for measuring the solubility in water of an agent for breaking a liquid film)

In the range corresponding to the environment, at a temperature of 25 ° C and a relative humidity (RH) of 65%, the obtained agent for the destruction of a liquid film gradually dissolves in it, while 100 g of deionized water is mixed with a stirrer, and the dissolved amount at a time when there is no dissolution as a result (when suspension, precipitation, precipitation or turbidity is observed), it is taken as solubility in water. Specifically, the agent is added in portions of 0.0001 g and a measurement is performed. As a result, for a sample in which the dissolution of the agent in an amount reaching 0.0001 g is not observed, the solubility in water is taken as `` less than 0.0001 g '', and for a sample in which the dissolution of the agent in the amount of 0.0001 g, and do not observe the dissolution of the agent in it in the amount of 0.0002 g, the solubility in water is taken as `` 0.0001 g ''. In addition, when the liquid film disruption agent is a surfactant, the term “dissolution” means both monodisperse dissolution and dissolution in the form of a micellar dispersion, and the dissolved amount at the time of observation of the suspension, precipitation, precipitation or Turbidity is accepted as solubility in water.

{0029}

When the agent for destroying a liquid film of the present embodiment has a spreading coefficient and solubility in water, as described above, it can spread without dissolving on the surface of the liquid film and can push the liquid film layer away from the center region near the liquid film. Thus, the liquid film is destabilized and destroyed.

{0030}

The above exposure to the agent for destroying a liquid film in a laminated nonwoven material of an embodiment is specifically described with reference to FIGS. 2 and 3.

As shown in FIG. 2, an excreted fluid, such as a high viscosity fluid, including menstrual blood and urine, easily forms a fluid film 2 in a narrow region between the fibers. To combat it, the agent for destroying the liquid film destabilizes and destroys the liquid film, as described below, and inhibits the formation of the liquid film, causing drainage of the inner part of the nonwoven material. First, as shown in Figures 3 (A1) and 3 (B1), the agent 3 for the destruction of the liquid film contained in the fibers 1 of the laminated non-woven material enters the surface of the liquid film 2, while maintaining the interface with the liquid film 2. Then, as shown in Figures 3 (A2) and 3 (B2), the agent 3 for destroying the liquid film displaces part of the liquid film 2, falling into the liquid film 2, in the thickness direction, and as shown in Figures 3 (A3) and 3 (B3), an agent for breaking the liquid film 3 gradually turns the liquid film 2 into an inhomogeneous and thin film. As a result, as shown in Figures 3 (A4) and 3 (B4), the liquid film 2 is perforated and destroyed in an explosive manner. A shattered film of fluid, such as menstrual blood, forms into a drop of fluid, easily passing through the space between the fibers of the laminated non-woven material, and the amount of residual fluid is reduced. In addition, the effect of the agent for destroying the liquid film on the liquid film is demonstrated in a similar manner not only on the liquid film between the fibers, but also on the liquid film enveloping the surface of the fibers. That is, the agent for destroying the liquid film can move into the liquid film, enveloping the surface of the fibers, and it pushes part of the liquid film, destroying the liquid film. In addition, in the case of a liquid film enveloping the surface of the fibers, the agent for breaking the liquid film can also destroy the liquid film by hydrophobic effects, without even moving from the position where the agent adheres to the fibers, and can inhibit the formation of the liquid film.

{0031}

Thus, the agent for breaking the liquid film of the present invention causes the liquid to be removed from the inside of the nonwoven material not by modifying the properties of the liquid, for example, not by reducing the surface tension, but by breaking the liquid film itself, formed between the fibers or on the surface of the fibers, while at the same time, displacing the liquid film and inhibiting the formation of a liquid film. Thus, the amount of residual liquid in the laminated non-woven material can be reduced. In addition, if such a laminated non-woven material is assembled in the absorbent article as a top sheet, fluid retention between the fibers is suppressed and a path is provided for liquid to penetrate the absorbent mass. Thus, liquid permeability is improved, fluid flow on the sheet surface is suppressed, and liquid absorption rate is improved. In particular, the rate of absorption of a fluid that is easily held between the fibers, such as high viscosity menstrual blood, can be improved. As a result, it is possible to form a comfortable absorbent article of high reliability in which discoloration of the top sheet, such as redness, is imperceptible, and in which sufficient absorbency is expected.

{0032}

In addition, of the present embodiment, the tension at the interface of the agent for destroying the liquid film and the liquid having a surface tension of 50 mN / m is preferably 20 mN / m or less. This means that the `` tension at the interface surface (γ _wo ) of the agent for destroying the liquid film and the liquid film '', which is one of the parameters for determining the spreading coefficient (S) in the expression (1) discussed above, is preferably 20 mN / m or less. The spreading coefficient of the agent for destroying the liquid film is improved by suppressing the “tension on the interface (γ _wo ) of the agent for destroying the liquid film and the liquid film itself”, and the agent for destroying the liquid film easily moves from the surface of the fibers in the region near the center of the liquid film, and the impact discussed above becomes clearer. From this point of view, the '' tension at the interface with the liquid having a surface tension of 50 mN / m for the agent for breaking the liquid film is more preferably 17 mN / m or less, even more preferably 13 mN / m or less even more preferably 10 mN / m or less, particularly preferably 9 mN / m or less, and particularly preferably 1 mN / m or less. On the other hand, its lower limit is not in any way limited, and it should be greater than 0 mN / m from the point of view of insolubility in the liquid film. In addition, if the tension at the interface is 0 mN / m, that is, the agent for destroying the liquid film is soluble, the interface between the liquid film and the agent for destroying the liquid film cannot be formed, and for this reason, expression (1) does not occur, and the spreading of the agent does not occur.

As is known from this expression, the numerical value of the spreading coefficient varies depending on the surface tension of the target fluid. For example, when the surface tension of the target liquid is 72 mN / m, the surface tension of the agent for breaking the liquid film is 21 mN / m, and when the tension on its interface is 0.2 mN / m, the spreading coefficient becomes 50.8 mN / m

In addition, when the surface tension of the target liquid is 30 mN / m, the surface tension of the agent for destroying the liquid film is 21 mN / m, and when its tension at the interface is 0.2 mN / m, the spreading coefficient becomes 8.8 mN / m

In any case, for an agent with a spreading coefficient greater, the effect of destruction of the liquid film becomes greater.

In the present description, a numerical value of a surface tension of 50 mN / m is determined. However, even if the surface tension is different, there is no change in the ratio of the numerical value of the spreading coefficient for various substances. For this reason, even if the surface tension of the body fluid should vary depending on the physical condition on that day or something like that, an agent for which the spreading coefficient is greater shows the best effect of the destruction of the liquid film.

{0033}

In addition, for the present embodiment, the surface tension of the liquid film breaking agent is preferably 32 mN / m or less, more preferably 30 mN / m or less, even more preferably 25 mN / m or less, and particularly preferably 22 mN / m or less. In addition, the surface tension is preferably less, and its lower limit is not in any way limited. From the point of view of the long-term action of the agent for the destruction of the liquid film, the surface tension is practically 1 mN / m or more.

Even when the surface tension of the target liquid that forms the liquid film is reduced, the effect of the destruction of the liquid film can be effectively demonstrated by bringing the surface tension of the agent for breaking the liquid film to the range described above.

{0034}

Next, a laminated nonwoven material 20 of a second embodiment will be described.

{0035}

Laminated nonwoven material 20 comprises two layers, namely, a first fiber layer 11 and a second fiber layer 12 arranged side by side in a manner similar to the laminated nonwoven material 10 of the first embodiment. The degree of hydrophilicity of the second fiber layer 12 is controlled to be higher than the degree of hydrophilicity of the first fiber layer 11. Thus, a gradient of the degree of hydrophilicity is formed, increasing from the first layer 11 of fibers to the second layer of 12 fibers in the direction along the thickness of the laminated non-woven material 20. The gradient of the degree of hydrophilicity here has the same meaning as in the first embodiment.

Thus, if the first layer 11 of fibers is used as a layer on the liquid receiving side also in the laminated nonwoven material 20 in a manner similar to the laminated nonwoven material 10, the gradient of the degree of hydrophilicity acts as a driving force for suctioning the liquid from the first layer 11 of fibers into the second layer 12 of fibers, and thus contributes to improving the liquid permeability of the laminated non-woven material 10.

In addition to this, the laminated nonwoven material 10 may further comprise any other layer in addition to the two layers.

{0036}

In addition to the hydrophilicity gradient described above, the laminated nonwoven material 20 contains, in at least one of the fiber layers, a liquid film disruption agent, which is a compound in which a spreading coefficient for a liquid having a surface tension of 50 mN / m, more than 0 mN / m, namely it has a positive value, the solubility in water is 0 g or more and 0.025 g or less and the tension at the interface for a liquid having a surface tension of 50 mN / m is 20 mN / m or no more.

{0037}

To have `` its tension at the interface with a liquid having a surface tension of 50 mN / m '' equal to 20 mN / m or less, as discussed above, means that the diffusion of the agent for breaking the liquid film on the liquid film is improved, as discussed above . Thus, even when the spreading coefficient is relatively small, as in the case where the '' spreading coefficient for a liquid having a surface tension of 50 mN / m, '' is less than 16 mN / m, the diffusion coefficient is high, and for this reason , a large amount of the liquid film disintegrating agent is dispersed in the liquid film from the surface of the fibers, and an effect similar to that in the case of the first embodiment can be effected by pushing the liquid film in a plurality of positions.

In addition, the `` spreading coefficient for a liquid having a surface tension of 50 mN / m, '', the `` solubility in water '' and the `` tension at the interface with a liquid having a surface tension of 50 mN / m '' for an agent to destroy the film of liquid are determined in the same manner as defined in the first embodiment, and the methods for measuring them are the same.

{0038}

For the present embodiment, from the point of view of an additional effective demonstration of the effect of the agent for destroying a liquid film, the “tension at the interface with the liquid having a surface tension of 50 mN / m” is preferably 17 mN / m or less, more preferably 13 mN / m or less, even more preferably 10 mN / m or less, even more preferably 9 mN / m or less, and particularly preferably 1 mN / m or less. The lower limit is not in any limited way similar to the first embodiment, and from the point of view of insolubility in the film of liquid (liquid having a surface tension of 50 mN / m), the tension at the interface is practically brought to more than 0 mN / m.

In addition, from the point of view of an additional effective demonstration of the effects of the agent for destroying the liquid film, the “spreading 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, and even more preferably, 16 mN / m or more. Its upper limit is not in any way limited, but from the point of view from which the surface tension of the liquid that forms the liquid film serves as the upper limit from expression (1), the spreading coefficient is essentially 50 mN / m or less.

In addition, the more preferred ranges of surface tension and water solubility of the agent for breaking the liquid film are the same as the ranges of the first embodiment.

{0039}

The laminated non-woven material of the first embodiment and the laminated non-woven material of the second embodiment each preferably additionally contain, in addition to the above-described respective liquid film breaking agents, an anionic phosphoric acid ester type surfactant. Thus, the hydrophilicity on the surface of the fibers improves, and the wettability improves, with an increase in the contact area over which the liquid film and the agent for breaking the liquid film are brought into contact. In addition to this, since blood and urine contain a surfactant containing a phosphoric acid group that is formed in a living organism, when a surfactant containing a phosphoric acid group is used together with an agent to break down a liquid film, a surfactant shows compatibility and good affinity for phospholipids contained in blood and urine. In this case, the agent for destroying the liquid film easily moves into the liquid film, and additional destruction of the liquid film is caused. The ratio of the content of the liquid disruption agent to the anionic surfactant of the phosphoric acid ester type is preferably from (1: 1) to (19: 1), more preferably from (2: 1) to (15: 1), and more preferably, from (3: 1) to (10: 1) in terms of the mass ratio. In particular, the content ratio is preferably from (5: 1) to (19: 1), more preferably from (8: 1) to (16: 1), and more preferably, from (11: 1) to (13: 1) in terms of mass relations.

{0040}

An anionic surfactant such as phosphoric acid ester can be used without any limitation. Specific examples thereof include phosphoric acid alkyl ester, phosphoric acid dialkyl ester and phosphoric acid alkyl ester. First of all, an alkyl ester of phosphoric acid is preferable from the point of view of the function of improving the affinity for the liquid film and ensuring the manufacturability of the nonwoven material.

As the phosphoric acid alkyl ester, various species thereof can be used without any limitation. Specific examples include a saturated carbon chain alkyl ester of phosphoric acid, such as a polyoxyalkylene stearyl ester of phosphoric acid, an ester of polyoxyalkylene myristyl ester of phosphoric acid, an ester of polyoxyalkylene lauryl ester of phosphoric acid and a polyoxyalkyl phosphoric acid ester; phosphoric acid alkyl ester containing an unsaturated carbon chain such as polyoxyalkylene oleyl phosphoric acid ester and polyoxyalkylene palmitoleyl phosphoric acid ester; and phosphoric acid alkyl ether ester containing a side chain in each of its carbon chains. More preferably, the phosphoric acid alkyl ester is a fully or partially neutralized salt of a monoester or dipolyoxyalkylene alkyl phosphoric acid ester containing a carbon chain of 16-18 atoms. In addition, specific examples of polyoxyalkylene include polyoxyethylene, polyoxypropylene, polyoxybutylene and a material in which its constituent monomers are copolymerized. In addition, specific examples of a phosphoric acid alkyl ester salt include an alkali metal salt such as sodium and potassium, ammonium and various amines. As the alkyl ester of phosphoric acid ester, one species of it can be used alone, or two or more species can be mixed and used.

{0041}

Concrete examples of agents for disrupting a liquid film of a first embodiment and a second embodiment will be described below. These agents are in the specific numerical range discussed above so that they have the properties of insolubility in water or low solubility in water and demonstrate the above-described effect of destruction of the liquid film. In contrast, a surfactant or the like, which should be used as a conventional fiber treatment agent, is basically a water-soluble agent that is almost completely soluble in water and used, and is not an agent for breaking a liquid film according to the present invention.

{0042}

As an agent for disrupting a liquid film of a first embodiment and a second embodiment, a compound having a weight average molecular weight of 500 or more is preferred. The weighted average molecular weight strongly affects the viscosity of the agent for breaking the liquid film. The agent for destroying the liquid film hardly drains when the liquid passes through the space between the fibers due to the preservation of high viscosity, and it is also possible to maintain the long-term effect of the destruction of the liquid film in the nonwoven material. From the point of view of adjusting the viscosity at a level at which the effect of the destruction of the liquid film is sufficiently long-term, the weighted average molecular weight of the agent for breaking the liquid film is more preferably 1000 or more, even more preferably 1500 or more, and particularly preferably it is 2000 or more. On the other hand, from the point of view of adjusting the viscosity at a level at which there is a migration of the agent for destroying the liquid film from the fibers containing the agent for destroying the liquid film placed on them into the liquid film, namely diffusion, its weighted average molecular weight is preferably 50,000 or less, more preferably 20,000 or less, and even more preferably 10,000 or less. The weighted average molecular weight is measured using a gel permeation chromatography (GPC) “CCPD” chromatograph (trade name, manufactured by TOSOH CORPORATION). The measurement conditions are described below. In addition, the calculation of the equivalent molecular weight is carried out using polystyrene.

Separation column: GMHHR-H + GMHHR-H (cationic)

Eluent: L FAMIN DM20 / CHCl3

Solvent flow rate: 1.0 ml / min

Separation column temperature: 40 ° C

{0043}

In addition, as an agent for destroying a liquid film of a first embodiment, as discussed below, a compound having at least one kind of structure selected from the group consisting of the following structures X, X-Y and Y-X-Y is preferred.

Structure X denotes a siloxane chain having a structure in which any of the basic structures> C (A) - (C denotes a carbon atom, in addition, <,> and -, each, denotes a chemical bond below, hereinafter referred to the same) , -C (A) ₂ -, -C (A) (B) -,> C (A) -C (R ¹ ) <,> C (R ¹ ) -, -C (R ¹ ) (R ² ) -, -C (R ¹ ) ₂ -,> C <, -Si (R ¹ ) ₂ O- and -Si (R ¹ ) (R ² ) O- are repeated, or two or more of their species are combined; or a mixed chain of them. Structure X contains at the end of structure X, a hydrogen atom or at least one type of group selected from the group consisting of —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 and -Si (R ¹ ) ₂ (R ² ).

The above R ¹ and R ² each independently represent different substituents, such as a hydrogen atom, an alkyl group (the number of carbon atoms is preferably from 1 to 20, for example, a methyl group, an ethyl group or a propyl group is preferred), an alkoxy group ( the number of carbon atoms is preferably from 1 to 20, for example, a methoxy group or an ethoxy group is preferred), an aryl group (the number of carbon atoms is preferably from 6 to 20, for example, the phenyl group is preferred) and a halogen atom (e.g. a fluorine atom is preferred). A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxy group, a carboxylic acid group, an amino group, an amide group, an imino group and a phenolic group. When there are many R ¹ , R ² , A and B, for each of them, X in the structure can be the same or different. In addition, the continuous bond between C (carbon atoms) or between Si is usually a single bond, but may include a double bond or a triple bond, and the bond between C or between Si may include a linking group, such as an ether group (-O- ), an amide group (—CONR ^A -: R ^A represents a hydrogen atom or a monovalent group), an ester group (—COO—), a carbonyl group (—CO—) or a carbonate group (—OCOO—). The number of bonds of one C and one Si with any other C or Si is from 1 to 4, and the long-chain silicone chain (siloxane chain) or mixed chain may be branched or may have a radial structure.

Y denotes a hydrophilic group having hydrophilicity, the group contains an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom or a sulfur atom. Specific examples include a hydrophilic group per se, such as a hydroxy group, a carboxylic acid group, an amino group, an amide group, an imino group, a phenolic group, a polyoxyalkylene group (the number of carbon atoms of the oxyalkylene group is preferably 1 to 4, for example polyoxyethylene (POE ) group, polyoxypropylene (POP) group are preferred), sulfonic acid group, sulfate group, phosphoric acid group, sulfobetainic group, carbobetainic group, phosphobetainic group (betaine group means a betaine residue group formed by removal of one hydrogen atom from each betaine compound) and a quaternary ammonium group; or a hydrophilic group formed from a combination thereof. In addition to this, their specific examples also include a group and a functional group from those listed in M ¹ , as discussed below. In addition to this, when the set Y exists, these groups may be the same or different.

In structures XY and YXY, Y binds to X or to a group at the end of X. When Y binds to a group at the end of X, for example, a group at the end of X binds to Y after removal of hydrogen atoms, and the like, in an amount identical to the number of bonds with Y.

In this structure, the spreading coefficient discussed above, solubility in water, and tension at the interface can be made satisfactory by selecting the hydrophilic groups Y, A, and B from the groups specifically described. Thus, the target effect of the destruction of the liquid film is developed.

{0044}

In the above-described liquid film disruption agent, a compound in which structure X contains a siloxane structure is preferred. In addition, as specific examples of the above structures X, XY, and YXY in the agent for breaking the liquid film, a compound containing a siloxane chain in which the structures represented by any of the following Formulas (1) to (11) are combined arbitrarily, is preferred. In addition, from the point of view of the effects of destruction of the liquid film, it is preferable that the compound has a weighted average molecular weight in the range discussed above.

{0045}

{0046}

In Formulas (1) to (11), M ¹ , L ¹ , R ^21, and R ²² denote the following monovalent or polyvalent (divalent or higher valency) group. R ²³ and R ²⁴ denote the following monovalent or polyvalent (divalent or higher valency) group or single bond.

M ¹ is a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a group containing a polyoxyalkylene group in combination with them, an erythritol group, a xylitol group, a sorbitol group, a hydrophilic group containing a plurality of hydroxy groups, such as a glycerol group or an ethylene glycol group (hydrophilic group, formed by removing one hydrogen atom from the above compound having a plurality of hydroxy groups such as erythritol), a hydroxy group, a carboxy group acid, mercapto group, alkoxy group (the number of carbon atoms is preferably 1-20, for example, methoxy group is preferred), amino group, amide group, imino group, phenolic group, sulfonic acid group, quaternary ammonium group, sulfobetainic group, hydroxysulfobetainic a group, a phosphobetaine group, an imidazolium betaine group, a carbobetaine group, an epoxy group, a carbinol group, a (meth) acrylic group or a functional group in combination with them. In addition, when M ¹ is a polyvalent group, M ¹ denotes a group formed by additionally removing one or more hydrogen atoms from each of the groups or from a functional group, as discussed above.

L ¹ represents a linking group from an ether group, an amino group (the amino group used as L ¹ is represented by> NR ^C (R ^C represents a hydrogen atom or a monovalent group)), an amide group, an ester group, a carbonyl group or carbonate group.

R ²¹ , R ²² , R ²³ and R ²⁴ each independently represent an alkyl group (the number of carbon atoms is preferably from 1 to 20, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, nonyl group or decyl group is preferred), alkoxy group (the number of carbon atoms is preferably from 1 to 20, for example, a methoxy group or ethoxy group is preferred), aryl g uppu (number of carbon atoms is preferably from 6 to 20, e.g., a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with, or a halogen atom (e.g., fluorine atom is preferred). In addition, when R ²² and R ²³ are a polyvalent group, R ²² and R ²³ are a polyvalent hydrocarbon group formed by additionally removing one or more hydrogen atoms or fluorine atoms from the hydrocarbon group described above.

In addition, when R ²² or R ²³ is bonded to M ¹ , specific examples of a group used as R ²² or R ²³ include, in addition to each group, a hydrocarbon group or a halogen atom described above, an imino group used in quality R ³² .

First of all, the agent for destroying a liquid film is preferably a compound having a structure represented by any of Formulas (1), (2), (5) and (10) as X and having a structure represented by any of the above formulas other than these formulas, as a group formed at the end of X or formed at the end of X and Y. In addition, the agent for breaking the liquid film is preferably a compound containing a siloxane chain having at least one structure represented by any of the above above formula (2) (4), (5), (6), (8) and (9), as a group formed of X or formed from endings X and Y.

{0047}

Specific examples of the compounds described above include organically modified silicone (polysiloxane) silicone-based surfactants. Specific examples of organically modified silicone modified with a chemically active organic group include amino-modified silicone, epoxy-modified silicone, carboxy-modified silicone, diol-modified silicone, carbinol-modified silicone, (meth) acrylic-modified silicone, mercapto -modified silicone and phenol-modified silicone. In addition, specific examples of organically-modified silicone modified with a chemically inactive organic group include polyether modified silicone (including polyoxyalkylene-modified silicone), methyl styryl-modified silicone, long-chain alkyl-modified silicone, higher fatty acid ester-modified silicone, higher alkoxy modified silicone; higher fatty acid modified silicone; and fluorine modified silicone. The spreading coefficient at which the above effect of the destruction of the liquid film is carried out can be obtained by a corresponding change in the molecular weight of the silicone chain, the modification ratio, the number of moles of the modifying group added or the like in accordance with the species, for example, organically modified silicone. The term “long chain” as used herein means a material in which the number of carbon atoms is 12 or more, and preferably from 12 to 20. In addition, the term “higher” means a material in which the number of carbon atoms is 6 or more, and preferably from 6 to 20.

First of all, a modified silicone having a structure in which the agent for breaking the liquid film is a modified silicone, contains at least one oxygen atom in a modifying group, such as polyoxyalkylene-modified silicone, and an epoxy-modified silicone, carbinol-modified silicone and diol-modified silicone are preferred, and polyoxyalkylene-modified silicone is particularly preferred. Polyoxyalkylene-modified silicone almost does not penetrate the fibers and is easy to hold on their surface, since the polyoxyalkylene-modified silicone contains a polysiloxane chain. In addition, with respect to the polyoxyalkylene-modified silicone, the affinity with water is improved, and the tension at the interface is low due to the presence of a hydrophilic polyoxyalkylene chain, and therefore, movement of the liquid film on the surface of the film is easily caused, as discussed above, and this is preferred. In addition, even if a melting treatment such as embossing is used, the polyoxyalkylene-modified silicone easily remains on the surface of the fibers in this part, and the effect of the destruction of the liquid film is almost not reduced. The impact of the destruction of the liquid film is sufficiently developed, in particular, in the part with embossing, in which liquid can easily accumulate, and therefore this case is preferable.

{0048}

Specific examples of polyoxyalkylene-modified silicone include compounds represented by the following Formulas [I] to [IV]. In addition, the polyoxyalkylene-modified silicone preferably has a weight average molecular weight in the above range from the point of view of the effects of destruction of the liquid film.

{0049}

{0050}

{0051}

{0052}

{0053}

In Formulas, R ³¹ is an alkyl group (where the number of carbon atoms is preferably 1 to 20, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, 2-ethyl hexyl group, nonyl group or decyl group is preferred). R ³² is a single bond or an alkylene group (the number of carbon atoms is preferably 1 to 20, such as a methylene group, an ethylene group, a propylene group or a butylene group is preferred), and preferably is an alkylene group. The plurality of R ³¹ and the plurality of R ³² may be, each, the same or different. M ¹¹ denotes a group containing a polyoxyalkylene group, and a polyoxyalkylene group is preferred. Specific examples of the polyoxyalkylene groups described above include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a material in which their constituent monomers are copolymerized. Then m and n each independently represent an integer of 1 or more. In addition to this, the designation of these repeating units is defined separately in each of the formulas [I] - [IV], and they do not always represent the same integers, and they can be different.

{0054}

In addition, the polyoxyalkylene-modified silicone may contain any modifying group for polyoxyethylene modification and polyoxypropylene modification, or both of them. In addition, the modified silicone preferably contains a methyl group in R ³¹ as the alkyl group of the silicone chain, to obtain water insolubility and low tension at the interface. The material containing this modifying group or silicone chain is not in any way limited, but the materials described in paragraphs {0006} and {0012} in JP-A-2002-161474 illustrate them. Other specific examples thereof include polyoxyethylene (POE) -polyoxypropylene (POP) -modified silicone, polyoxyethylene (POE) -modified silicone and polyoxypropylene (POP) -modified silicone. Specific examples of POE-modified silicone include POE (3) -modified dimethyl silicone, to which 3 moles of POE are added. Specific examples of POP-modified silicone include POP (10) -modified dimethyl silicone, POP (12) -modified dimethyl silicone, and POP (24) -modified dimethyl silicone, to which 10 moles of POP, 12 moles of POP and 24 moles of POP are added, respectively.

{0055}

The spreading coefficient and solubility in water in the first embodiment discussed above can be adjusted in predetermined ranges, for example, in polyoxyalkylene-modified silicone - by adding the number of moles of polyoxyalkylene groups (the number of binding oxyalkylene groups that form the polyoxyalkylene group, relative to 1 mole of polyoxyalkylene- modified silicone), following a modification relationship or the like. In this liquid film breaking agent, the surface tension and the tension at the interface can be adjusted in predetermined ranges in the same manner, respectively.

From the point of view described above, the number of moles of polyoxyalkylene groups added is preferably 1 or more. When the amount is less than 1, the tension at the interface increases too much for the above-described effects of destruction of the liquid film, causing a decrease in the spreading coefficient, and for this reason, the effect of destruction of the liquid film is weakened. From this point of view, the number of moles added is more preferably 3 or more, and even more preferably 5 or more. On the other hand, if the number of moles added is too large, the agent for breaking the liquid film becomes hydrophilic, and the solubility in water increases. From this point of view, the number of moles added is preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less.

If the modification ratio of the modified silicone is too small, the hydrophilicity is degraded, and for this reason, the modification ratio is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more. Furthermore, if the modification ratio is too large, the agent for breaking the liquid film is dissolved in water, and for this reason, the modification ratio is preferably 95% or less, more preferably 70% or less, and even more preferably 40% or smaller. In addition, the modification ratio of the modified silicone means the fraction of the number of repeating units of the binding part of the modified siloxane relative to the total number of repeating units of the binding part of the siloxane in one molecule of the modified silicone. For example, the modification ratio is expressed by the expression: (n / m + n) × 100% in Formulas [I] and [IV], the expression: (2 / m) × 100% in Formula [II] and the expression: (1 / m) × 100% in Formula [III].

In addition, the spreading coefficient and solubility in water, discussed above, each can be set in a predetermined range, in addition to the material described above, for example, in a polyoxyalkylene-modified silicone, by using together a water-soluble polyoxyethylene group and a water-insoluble polyoxypropylene group, and a water-insoluble a polyoxybutylene group as a modifying group, by changing the molecular weight of the water-insoluble silicone chain; introducing into it an amino group, an epoxy group, a carboxy group, a hydroxy group, a carbinol group or the like, in addition to the polyoxyalkylene modification, as a modifying group, or the like.

{0056}

The polyalkylene-modified silicone used as an agent for disrupting a liquid film is preferably contained at 0.02% by mass or more and 5.0% by mass or less in terms of a fraction of the content (Oil Per Unit) relative to the weight of the fibers . The OPU content of the polyalkylene-modified silicone is more preferably 1.0% by mass or less, and even more preferably 0.40% by mass or less. Thus, the stickiness of the nonwoven material is prevented and the resulting product has a preferred texture. In addition, from the point of view of effectively demonstrating the effects of destruction of a liquid film by a polyalkylene-modified silicone, the content fraction (OPU) is more preferably 0.04% by mass or more, and even more preferably 0.10% by mass or more.

{0057}

As an agent for destroying a liquid film of a second embodiment, as discussed below, a compound containing at least one kind of structure selected from the group consisting of the following structures Z, Z-Y and Y-Z-Y is preferred.

Structure Z denotes a hydrocarbon chain having a structure in which any of the basic structures> C (A) - (C: carbon atom), -C (A) ₂ -, -C (A) (B) -,> C ( A) -C (R ³ ) <,> C (R ³ ) -, -C (R ³ ) (R ⁴ ) -, -C (R ³ ) ₂ - and> C <or two or more of their species are combined. The Z structure has, at one end thereof, a hydrogen atom or at least one type of group selected from the group consisting of —C (A) ₃ , —C (A) ₂ B, —C (A) (B) _{2 ,} -C (A) ₂ -C (R ³ ) ₃ , -C (R ³ ) ₂ A and -C (R ³ ) ₃ .

The above R ³ and R ⁴ each independently represent different types of substituents, such as a hydrogen atom, an alkyl group (the number of carbon atoms is preferably from 1 to 20, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group , pentyl group, hexyl group, heptyl group, 2-ethyl-hexyl group, nonyl group or decyl group is preferred), alkoxy group (the number of carbon atoms is preferably from 1 to 20, for example, methoxy group PPA or ethoxy group is preferred), an aryl group (the number of carbon atoms is preferably 6-20, for example, a phenyl group is preferred), a fluoroalkyl group or an aralkyl group, or a hydrocarbon group in combination with them or a fluorine atom. A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxy group, a carboxylic acid group, an amino group, an amide group, an imino group or a phenolic group. When a plurality of R ³ , R ⁴ , A or B is included in structure X, each of them may be the same or different. In addition, continuous bonds between C (carbon atom) is usually a single bond, but may include a double bond or a triple bond, and the bond between C may include a linking group such as an ether group, an amide group, an ester group, a carbonyl group, or carbonate group. The number of bonds of one C with any other C is 1-4, and the long chain hydrocarbon chain may have a branched structure or may have a radial structure.

Y denotes a hydrophilic group having hydrophilicity, the hydrophilic group contains an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom and a sulfur atom. Specific examples include: a hydroxy group, a carboxylic acid group, an amino group, an amide group, an imino group and a phenolic group; a polyoxyalkylene group (the number of carbon atoms of the oxyalkylene group is preferably 1 to 4, for example, a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group or a polyoxyalkylene group in combination with them is preferred); a hydrophilic group containing many hydroxy groups, such as an erythritol group, a xylitol group, a sorbitol group, a glycerol group and an ethylene glycol group; a hydrophilic group per se, such as a sulfonic acid group, a sulfate group, a phosphoric acid group, a sulfobetainic group, a carbobetainic group, a phosphobetainic group, a quaternary ammonium group, an imidazolium betaine group, an epoxy group, a carbinol group, and a methacrylic group; or a hydrophilic group formed from a combination thereof. In addition to this, when Y is many, the groups in this set may be the same or different.

In the structures ZY and YZY, Y is associated with Z or with a group at the end of Z. When Y is connected with a group at the end of Z, the group at the end of Z is associated with Y, for example, after removal of hydrogen atoms, and the like, in an amount identical to the number of bonds with Y.

In this structure, the requirements for spreading coefficient, solubility in water, and tension at the interface discussed above can be satisfied by selecting hydrophilic groups Y, A, and B from the specifically described groups. Thus, the target effect of the destruction of the liquid film is developed.

{0058}

The liquid film disruption agent is preferably a compound obtained by arbitrarily combining the structures represented by any of the following Formulas (12) to (25) as specific examples of Z, Z-Y and Y-Z-Y structures. In addition, from the point of view of the effect of destruction of the liquid film, it is preferable that this compound has a weighted average molecular weight in the above range.

{0059}

{0060}

In Formulas (12) to (25), M ² , L ² , R ⁴¹ , R ⁴² and R ⁴³ denote the following monovalent or polyvalent (divalent or higher valency) groups.

M ² is a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a group containing a polyoxyalkylene group in combination with them, an erythritol group, a xylitol group, a sorbitol group, a hydrophilic group containing many hydroxy groups, such as a glycerol group or an ethylene glycol group, a hydroxy group, carboxylic acid group, mercapto group, alkoxy group (the number of carbon atoms is preferably from 1 to 20, for example, a methoxy group is preferred), am but the group, amide group, imino group, phenolic group, sulfonic acid group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetainic group, phosphobetainic group, imidazolium betaine group, carbobetainic group, epoxy group, carbolic group, (meth) acrylic group or functional group in combination with them.

L ² is a linking group, such as 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 in combination with them.

R ⁴¹ , R ⁴² and R ⁴³ each independently represent different substituents, such as a hydrogen atom, an alkyl group (the number of carbon atoms is preferably from 1 to 20, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group , pentyl group, hexyl group, heptyl group, 2-ethyl-hexyl group, nonyl group or decyl group is preferred), alkoxy group (the number of carbon atoms is preferably from 1 to 20, for example, methoxy group or ethoxy g Uppal is preferred), an aryl group (number of carbon atoms is preferably from 6 to 20, e.g., a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with, or a halogen atom (e.g., fluorine atom is preferred).

When R ⁴² is a polyvalent group, R ⁴² is a group formed by further removing one or more hydrogen atoms from each substituent described above.

In addition to this, at the end of the chemical bond described in each structure, any other structure may optionally be attached or a hydrogen atom may be introduced.

{0061}

In addition, specific examples of the above compounds include the following compounds, but not limited to.

First, examples thereof include a compound of a polyether and a nonionic surfactant. Specific examples thereof include a polyoxyalkylene alkyl (POA) ether represented by any of the formulas in Formula [V]; polyoxyalkylene glycol which is represented by Formula [VI] and has a weight average molecular weight of 1000 or more, Steareth, Beheneth, simple PPG (polyethylene glycol) myristyl ether, simple PPG stearyl ether and simple PPG behenyl ether. As the polyoxyalkylene alkyl ether, lauryl ether is preferable to which 3 mol or more and 24 mol or less POP, and preferably 5 mol, or the like are added. As the polyether compound, polypropylene glycol having a weight average molecular weight of from 1000 to 10000, and preferably it is 3000, to which polypropylene glycol is added in an amount of 17 mol or more and 180 mol or less, and the preferred amount is about 50 mol or what anything like that. In addition, the measurement of the weighted average molecular weight can be carried out using the measurement method discussed above.

{0062}

The polyether compounds or non-ionic surfactant is preferably contained at 0.10% by mass or more and at 5.0% by mass or less in terms of a fraction of the content (Oil Per Unit) with respect to the weight of the fibers. The proportion (OPU) of a polyester compound or a nonionic surfactant is more preferably 1.0% by mass or less, and even more preferably 0.40% by mass or less. Thus, the stickiness of the nonwoven material is prevented and the resulting product has a preferred texture. From the point of view of effectively demonstrating the effects of destruction of the liquid film by the action of a polyether compound or a non-ionic surfactant, the content fraction (OPU) is more preferably 0.15% by mass or more, and even more preferably 0.20% by mass or more.

{0063}

{0064}

{0065}

In Formulas, L ²¹ is a linking group, such as an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, a polyoxyethylene group, a polyoxypropylene group or a polyoxybutylene group, or a polyoxyalkylene group in combination with them. R ⁵¹ represents various substituents such as 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 a group, a phenyl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with them, or a fluorine atom. In addition, a, b, m, and n, each independently, are an integer of 1 or more. C _m H _n in this document denotes an alkyl group (n = 2m + 1), and C _a H _b denotes an alkylene group (a = 2b). In addition to this, the number of carbon atoms and the number of hydrogen atoms, each, are independently determined in each of the formulas [V] and [VI], and they are not always an identical integer, and they can be different. Below, the same rule also applies to m, m ', m'', n, n' and n '' in Formulas [VII] - [XV]. In addition to this, `` m '' in - (C _a H _b O) _m - is an integer of 1 or more. The values of the repeating units, each, are independently determined in each of the formulas [V] and [VI], and they do not always represent an identical integer, and they can be different.

{0066}

The spreading coefficient, surface tension, and water solubility described above of the second embodiment can each be set to a predetermined range for connecting a polyether or a nonionic surfactant, for example, by the number of moles of a polyoxyalkylene group or the like. From this point of view, the number of moles of the polyoxyalkylene group is preferably 1 or more and 70 or less. When the amount is less than 1, the tension on the interface is high, and the above effect of the destruction of the liquid film is weakened. From this point of view, the number of moles is more preferably 5 or more, and even more preferably 7 or more. On the other hand, the amount of moles added is preferably 70 or less, more preferably 60 or less, and even more preferably 50 or less. Thus, the entanglement of molecular chains is moderately attenuated, and the diffusion of the agent in the liquid film is excellent, and this is preferred.

In addition, the spreading coefficient, surface tension, the tension at the interface and the solubility in water, described above, each can be set in a predetermined range for connecting a polyester or non-ionic surfactant, by using together a water-soluble polyoxyethylene group and a water-insoluble polyoxypropylene group and a water-insoluble polyoxybutylene group, by changing the chain length for the hydrocarbon chain, by using a material having chain branching present in the hydrocarbon chain, by using a material having a double bond in the hydrocarbon chain, by using a material having a benzene ring or naphthalene ring in the hydrocarbon chain, by an appropriate combination of all the above, or the like.

{0067}

Secondly, examples include a hydrocarbon compound containing 5 or more carbon atoms. From the point of view that the spreading on the surface of the liquid film is further enhanced in a fluid state, the number of carbon atoms is preferably 100 or less, and more preferably 50 or less. The hydrocarbon compound, excluding polyorganosiloxane, is not limited to a straight chain only and may have a branched chain, while the chain is not limited to any saturated chain or unsaturated chain. In addition, the hydrocarbon compound may contain a substituent such as an ester and an ether, in its middle part and at the end. In addition, a hydrocarbon compound in a fluid at ordinary temperature is preferred and is used on its own. The hydrocarbon compound is preferably contained at 0.10% by mass or more and at 5.0% by mass or less, in terms of a fraction of the content (Oil Per Unit) with respect to the weight of the fibers. The proportion (OPU) of the hydrocarbon compound is preferably 1.0% by mass or less, more preferably 0.99% by mass or less, and even more preferably 0.40% by mass or less. Thus, stickiness of the surface material is prevented, and the resulting product has a preferred texture. In addition, from the point of view of effectively demonstrating the effect of destruction of a liquid film by using a fraction of the content of a hydrocarbon compound, the content fraction (OPU) is more preferably 0.15% by mass or more, and even more preferably 0.20% by mass or more.

{0068}

Examples of the hydrocarbon compound include oil or fat, such as natural oil or natural fat. Specific examples include palm oil, camellia oil, castor oil, coconut oil, corn oil, olive oil, sunflower oil, tall oil, and mixtures thereof.

In addition, specific examples thereof include a fatty acid 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.

{0069}

{0070}

In Formula [VII], m and n each independently represent an integer equal to 1 or more. C _m H _n herein refers to a hydrocarbon group of a fatty acid as described above.

{0071}

Examples of a straight or branched chain, saturated or unsaturated, or substituted or unsubstituted ester of a polyhydric alcohol and a fatty acid or a mixture of esters of a polyhydric alcohol and a fatty acid include a glycerol ester of a fatty acid or a pentaerythritol ester of a fatty acid as represented by Formula [ VIII-I] or [VIII-II], and specific examples thereof include glyceryl tricaprilate, glyceryl tripalmitate, and mixtures thereof. In addition to this, a certain amount of the monoester, diester and triester is usually mixed with a glycerol ester of a fatty acid or a pentaerythritol ester of a fatty acid. Specific preferred examples of glycerol fatty acid ester include a mixture of glyceryl tricaprylate and glyceryl tricapriate. In addition, from the point of view of reducing the tension on the interface to obtain a higher spreading coefficient, an ester of a polyhydric alcohol and a fatty acid can be used in which a polyoxyalkylene group is introduced to such an extent that water insolubility can be maintained.

{0072}

{0073}

{0074}

In Formulas [VIII-I] and [VIII-II], m, m ′, m ″, n, n ′ and n ″, each independently represents an integer equal to 1 or more. The set m or the set n, each, can be the same or different. C _m H _n, Sm'H _n 'and Sm''H _n' ', each herein is a hydrocarbon group of a fatty acid as described above.

{0075}

Examples of a fatty acid or a mixture of fatty acids in which a straight or branched chain, saturated or unsaturated fatty acid forms a polyol and an ester with a polyol containing a large amount of hydroxy groups, and part of the hydroxy groups is left without esterification, include a partially esterified ester product glycerol and a fatty acid, a sorbitan fatty acid ester or a pentaerythritol fatty acid ester, as represented by any of the formulas in Formula [IX], any of the formulas in For mule [X] or any of the formulas in Formula [XI]. Specific examples thereof include ethylene glycol mono-myristate, ethylene glycol dimyristate, ethylene glycol palmitate, ethylene glycol dipalmitate, glyceryl di-myristate, glyceryl dipalmitate, glyceryl monooleate, sorbitan monooleate, sorbitan mono-erytholene rite-erytholene rite-erytholene rite-erythritolate In addition to this, a certain amount of a fully esterified compound is typically introduced into a mixture formed from a partially esterified product of a glycerol ester and a fatty acid, a sorbitan fatty acid ester, a fatty acid pentaerythritol ester or the like.

{0076}

{0077}

In Formula [IX], m and n each independently represent an integer equal to 1 or more. The set m or the set n, each, can be the same or different. C _m H _n herein refers to a hydrocarbon group of a fatty acid as described above.

{0078}

{0079}

In Formula [X], R ⁵² is a straight or branched chain or saturated or unsaturated hydrocarbon group (alkyl group, alkenyl group, alkynyl group or the like) containing 2 or more and 22 or less carbon atoms. Specific examples include a 2-ethylhexyl group, a lauryl group, a myristyl group, a palmityl group, a stearyl group, a behenyl group, an oleyl group, and a linoleic group.

{0080}

{0081}

In Formula [XI], m and n each independently represent an integer equal to 1 or more. The set m or the set n, each, can be the same or different. C _m H _n herein refers to a hydrocarbon group of a fatty acid as described above.

{0082}

In addition, examples include sterol, phytosterol and a sterol derivative. Specific examples thereof include cholesterol, sitosterol, stigmasterol, ergosterol and mixtures thereof, each of which has the sterol structure of Formula [XII].

{0083}

{0084}

Specific examples of the alcohol include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, and mixtures thereof, as represented by Formula [XIII].

{0085}

{0086}

In Formula [XIII], m and n each independently represent an integer equal to 1 or more. C _m H _n herein refers to a hydrocarbon group of the above alcohol.

{0087}

Specific examples of the fatty acid ester include isopropyl myristate, isopropyl palmitate, cetylethyl hexanoate, triethyl hexanoin, octyldodecyl myristate, ethyl hexyl palmitate, ethyl hexyl stearate, butyl stearate, myristyl myristate, stearyl stearate, stearyl stearate, stearyl stearate, stearyl stearate, stearyl stearate, stearyl stearate, stearyl stearate, and stearyl stearate stearate stearyl stearate stearyl stearate stearyl stearate stearyl stearate stearate stearyl stearate stearyl stearate stearyl stearate stearate stearyl stearate.

{0088}

{0089}

In Formula [XIV], m and n each independently represent an integer equal to 1 or more. The two parts of C _m H _n in this document may be the same or different. C _m H _n in C _m H _n —COO— denotes the hydrocarbon group of each fatty acid described above. C _m H _n in —COOC _m H _n denotes a hydrocarbon group derived from an alcohol that forms an ester.

{0090}

In addition, specific examples of waxes include ceresin, paraffin, petroleum jelly, mineral oil, and liquid isoparaffin, as represented by Formula [XV].

{0091}

{0092}

In Formula [XV], m and n each independently represent an integer equal to 1 or more.

{0093}

The spreading coefficient, surface tension, solubility in water and the tension at the interface of the second embodiment, each, as described above, can be set in a predetermined range, in the hydrocarbon compound described above, containing 5 carbon atoms or more, for example, by introducing a small the amount of hydrophilic polyoxyethylene group in it to such an extent that it is possible to maintain insolubility in water by introducing a polyoxypropylene group or an oxybutylene group which is hydrophobic but can reduce the tension at the interface by changing the chain length for the hydrocarbon chain by using a material having a chain branching in the hydrocarbon chain, by using a material having a double bond in the hydrocarbon chain, by using a material having benzene a ring or a naphthalene ring in a hydrocarbon chain or the like.

{0094}

In the nonwoven material of the present invention, in addition to the above-described agent for destroying a liquid film, other components may also be contained, if necessary. Further, the liquid film disintegrating agent of the first embodiment and the liquid film disintegrating agent of the second embodiment can be used in combination, in addition to the separate use aspect. In this regard, the same rule also applies to the first compound and to the second compound in the agent for breaking the liquid film of the second embodiment.

{0095}

Next, each laminated nonwoven fabric of the first embodiment and the second embodiment will be described, the degree of hydrophilicity of the first fiber layer 11 and the second fiber layer 12.

{0096}

The degree of hydrophilicity of the first fiber layer 11 and the degree of hydrophilicity of the second fiber layer 12 are determined by the degree of hydrophilicity of the fibers constituting each fiber layer, respectively, and they can be estimated using the contact angle with deionized water for the constituent fibers as an indicator. The contact angle is the angle between the drop of water and the surface of the fiber, and a decrease in the degree of hydrophilicity is as important as an increase in the contact angle. This contact angle can be obtained using the following measurement method.

{0097}

From the point of view of the liquid suction properties discussed above, the difference (W) in the contact angles between the first fiber layer 11 and the second fiber layer 12 is preferably 5 degrees or more, more preferably 10 degrees or more, and even more preferably 15 degrees or more. In addition, with respect to the difference in contact angles between the first fiber layer 11 and the second fiber layer 12, the difference is as large as possible, it is better, but from the point of view of adjusting the degree of hydrophilicity by adjusting the agent for processing fibers and its applied amount, it is practical to adjust this difference at 90 degrees or less.

{0098}

In terms of reducing the amount of liquid adhering to the skin for a layer on the side of the liquid receiving surface, the contact angle (V1) of the first fiber layer 11 is preferably 75 degrees or more, more preferably 80 degrees or more, and even more preferably 85 degrees or more. In addition, from the point of view of liquid absorption by the fiber layer without liquid repulsion, the contact angle (V1) of the first fiber layer 11 is preferably 100 degrees or less, more preferably 95 degrees or less, and even more preferably 90 degrees or less. Specifically, the contact angle (V1) of the first fiber layer 11 is preferably 75 degrees or more and 100 degrees or less, more preferably 80 degrees or more and 95 degrees or less, and even more preferably 85 degrees or more and 90 degrees or less .

{0099}

From the point of view of pumping liquid from the first fiber layer, as the layer adjacent to the layer on the liquid receiving side and on the side of the opposite liquid receiving surface, the contact angle (V2) of the second fiber layer 12 is preferably less than 75 degrees, more preferably 70 degrees or less, and even more preferably 65 degrees or less. In addition, in terms of allowing fluid to migrate from the second fiber layer to the absorbent pulp layer, the contact angle (V2) of the second fiber layer 12 is preferably 20 degrees or more, more preferably 25 degrees or more, and even more preferably 30 degrees or more. Specifically, the contact angle (V1) of the first fiber layer 11 is preferably 20 degrees or more and less than 75 degrees, more preferably 25 degrees or more and 70 degrees or less, and even more preferably 30 degrees or more and 65 degrees or less.

{0100}

The contact angle (V1) of the first fiber layer 11 and the contact angle (V2) of the second fiber layer 12, as described above, more preferably satisfy the above-mentioned difference (W) of the contact angles between both layers of fibers.

{0101}

Such a contact angle of the first fiber layer 11 and such a contact angle of the second fiber layer 12 can be set using various methods commonly used for nonwoven materials. For example, contact angles may be established by adjusting a fiber treatment agent to be applied to the outermost surface of the fiber in each layer and amount applied. The fiber treatment agent also contains the above-described agent for breaking a liquid film.

Specific examples thereof include a method for adjusting the degree of hydrophilicity, as shown below.

For example, the applied amount on the lower side of the layer is adjusted so that it is higher than the applied amount on the side of the upper layer.

In addition, the amount of anionic surfactant to be mixed containing a sulfonic acid group, a sulfuric acid group or a phosphoric acid group exhibiting strong hydrophilicity is increased in the fiber treating agent applied to the lower side of the layer.

Alternatively, the degree of hydrophilicity can also be controlled by increasing the amount of admixed water-soluble POA-modified silicone or ampholytic surfactant, such as hydroxysulfobetaine and carbobetaine, in a fiber treatment agent applied to the underside of the layer.

In addition, the gradient of the degree of hydrophilicity can also be increased by additionally coating the agent with water-repellent properties, as described below, on at least part of the upper side of the layer to achieve low hydrophilicity or water-repellent properties.

Specific examples of the water-repellent agent include liquid paraffin, petroleum jelly, silicone oil, animal and vegetable oil (olive oil, jojoba oil, safflower oil, squalane and squalene), fatty acid ester, fluorochemical surfactant and fluorine-containing oil.

{0102}

The contact angle measurement described above is carried out using the method described below.

That is, the fiber is selected from a predetermined location of the laminated non-woven material, and the contact angle of the water and the fiber is measured. As a measuring device, use Automatic Contact Angle Meter MCA-J, manufactured by Kyowa Interface Science Co., Ltd .. To measure the contact angle using distilled water. The measurement is carried out in an environment at a temperature of 25 ° C and at a relative humidity (RH) of 65%. The amount of fluid that must be emitted in the jet from the node for emitting jets of water droplets according to the inkjet printing system (a CTC-25 pulse injector having a hole of the ink jet assembly of 25 μm is produced by Cluster Technology Co., Ltd.) is set at 20 picoliters, and drops of water are added dropwise directly to the fibers. The drop-by-drop aspect is recorded on a high speed recording device connected to a horizontally mounted camera. From the point of view of image analysis and subsequent image analysis, the recording device is preferably a personal computer to which a high-speed recording device is connected. With this measurement, an image is recorded every 17 ms. On the registered image, the image is analyzed, on the first image, on which a drop of water settles on the fibers selected from the nonwoven material, using the FAMAS auxiliary software (software version: version 2.6.2, analysis method: fixed drop method, analysis method: θ / 2 method, image processing algorithm: without reflection, image processing mode: frame, threshold level: 200, and curvature correction: no), to calculate the angle formed between the fibers and the surface th drop of water in contact with air, and the calculated value is taken as the contact angle. Fibers selected from non-woven material are cut into fibers with a length of 1 mm, the fibers are placed on a stand for samples of the contact angle meter, which must be supported horizontally. And then the fibers are exposed to contact angle measurements in two different positions on the same fiber. Contact angles (N = 5 fibers) are measured to one decimal place, and the value (rounded to one decimal place) obtained by averaging the measured values at ten places as a whole is defined as the contact angle.

{0103}

In addition, in the laminated nonwoven material of the present invention, when an agent for breaking a liquid film or an anionic surfactant such as a phosphoric acid ester contained therein is identified, the identification method described in the method for measuring surface tension (γ _w ) a liquid film (a liquid having a surface tension of 50 mN / m), or the like.

In addition, when the component of the liquid film disruption agent is a compound in which the main chain contains a siloxane chain, or a hydrocarbon compound in which the number of carbon atoms is 1 or more and 20 or less, the proportion of their content (OPU) in relation to the mass fibers can be determined by dividing the proportion of the agent for breaking the liquid film by the mass of the fiber, based on the mass of the substance obtained using the analytical method discussed above.

{0104}

The laminated nonwoven material of the present invention is formed as a product having a high liquid permeability, regardless of the thickness of the fibers or the distance between the fibers. However, the laminated nonwoven fabric of the present invention is particularly effective when thin fibers are used. If thin fibers are used to form a laminated nonwoven material having a softer texture than usual, the distance between the fibers decreases and the length of the narrow regions between the fibers increases. For example, as a rule, in the case of a nonwoven material (fineness: 2.4 dtex) used typically, the distance between the fibers is 120 μm, and the fraction of the area of the liquid film to be formed becomes approximately 2.6%. However, if the fineness is reduced to 1.2 dtex, the distance between the fibers is 85 μm, and the fraction of the area of the liquid film increases to about 7.8%, to an extent that is about 3 times greater than the fraction in ordinary non-woven material. In contrast, even if the fineness is reduced to 1.2 dtex, in the laminated nonwoven material of the present invention, the agent for breaking the liquid film and reliably destroys the liquid film, which often occurs, and thus, the amount of residual liquid is reduced. As discussed below, the fraction of the area of the liquid film is expressed in terms of the fraction of the area of the liquid film, which should be calculated from the analysis of images from the surface of the laminated non-woven material, and has a strong correlation with the state of the residual liquid on the outermost surface of the surface material. For this reason, if the fraction of the area of the liquid film is reduced, the liquid near the skin is eliminated, the comfort level after discharge improves, and thus an absorbent article is obtained that is comfortable to wear even after isolation. On the other hand, the amount of residual liquid, discussed below, means the amount of liquid held in the laminated non-woven material as a whole. If the fraction of the area of the liquid film decreases, the film collapses and the amount of destabilized liquid increases, the liquid is sucked from the fiber layer with a lower degree of hydrophilicity into the fiber layer with a higher degree of hydrophilicity in one direction as caused by the gradient of the degree of hydrophilicity, and the amount of residual liquid decreases. In addition, surface whiteness is expressed in terms of the value of L, discussed below. Regarding the value of L, its numerical value tends to increase with a decrease in the amount of residual liquid, which is caused by the destruction of the liquid film on the surface, while the whiteness becomes easily visible visually. In a laminated non-woven material containing a liquid film breaking agent of the present invention, even if the fibers become thinner, the liquid film area fraction and the amount of residual liquid are reduced, and the L value can increase, and for this reason, both the feeling of dry skin and soft the texture imparted by the reduction in fiber thickness can be satisfied at a high level. In addition, the laminated nonwoven material of the present invention is used as a constituent element, such as a surface material of an absorbent article, to achieve a high feeling of dryness in the part in contact with the skin, and it is possible to make the contamination of the body fluid invisible by visual whiteness, and this For this reason, an absorbent article can be obtained for which anxiety about leaks can also be suppressed and considerable wearing comfort is realized.

From the point of view of increasing the softness of the texture of the laminated non-woven material that contains such an agent for breaking the liquid film and has a gradient of the degree of hydrophilicity, the distance between the fibers of the laminated non-woven material is preferably 150 μm or less, and more preferably 90 μm or less. In addition, from the point of view of suppressing a negative effect on the liquid permeability, which is caused by a too small distance between the fibers, its lower limit is preferably 50 μm or more, and more preferably 70 μm or more. Specifically, the distance between the fibers is preferably 50 μm or more and 150 μm or less, and more preferably 70 μm or more and 90 μm or less.

The fineness of the fibers in this case is preferably 3.3 dtex or less, and more preferably 2.4 dtex or less. In addition, its lower limit is preferably 0.5 dtex or more, and more preferably 1.0 dtex or more. Specifically, the fineness is preferably 0.5 dtex or more and 3.3 dtex or less, and more preferably 1.0 dtex or more and 2.4 dtex or less.

{0105}

(Method for measuring the distance between fibers)

The distance between the fibers is determined by measuring the thickness of the nonwoven material as an object of measurement, and then applying the measured value to the expression (2).

First, the laminated non-woven material as an object of measurement is cut into pieces with dimensions of 50 mm in the longitudinal direction × 50 mm in the transverse direction to obtain a cut out piece of the laminated non-woven material.

The thickness of the cut piece is measured under a pressure of 49 Pa. The measurement environment is a temperature of 20 ± 2 ° C and a relative humidity of 65 ± 5%, and a microscope (VHX-1000, manufactured by KEYENCE Corporation) is used as a measuring tool. First, an enlarged cross-sectional photograph of the laminated non-woven fabric described above is obtained. In the enlarged photograph, a piece having a known size is photographed. An enlarged cross-sectional photograph of a laminated non-woven fabric combines a scale for measuring the thickness of a laminated non-woven fabric. The operation described above is carried out 3 times, and the average value for 3 measurements is taken as the thickness (mm) of the laminated non-woven material in the dry state. In addition, in the case of a laminated product, the boundary is different from the diameter of the fibers to calculate the thickness.

Then, the distance between the fibers in the fibers that make up the laminated non-woven material as an object of measurement is determined by the Formula based on the assumption of Wrotnowski, shown below. A formula based on the Wrotnowski assumption is typically used in determining the spacing between fibers for the fibers that make up the nonwoven. According to the formula based on the Wrotnowski hypothesis, the distance between the fibers A (μm) is determined using the following expression (2) using the thickness h (mm) of the laminated non-woven material, its base mass e (g / m ² ), and fiber diameter d (μm) for the fibers that make up the nonwoven material, and the density of its fibers ρ (g / cm ³ ). In addition, when the nonwoven material has a concavity and convexity, the distance between the fibers is calculated using the thickness of the laminated nonwoven material h (mm) in the convex part as a representative value.

Regarding the fiber diameter d (μm), 10 pieces of fiber cross-sections for cut fibers are measured using a scanning electron microscope (DSC6200, manufactured by Seiko Instruments Inc.), and their average value is taken as the fiber diameter.

The fiber density ρ (g / cm ³ ) is measured using a tube with a density gradient in accordance with the measurement method described as the method using a tube with a density gradient in JIS L1015 Test methods for chemical staple fibers.

Regarding the base mass e (g / m ² ), non-woven material — the measurement object is cut into pieces having a predetermined size (0.12 m × 0.06 m or something similar), and after measuring the mass, the base mass is determined by calculating in accordance with the expression `` mass / area determined by given dimensions = base mass (g / m ² ). ''

{0106}

{0107}

(Method for measuring the fineness of constituent fibers)

The fineness is calculated by measuring the cross-sectional shape of the fiber using an electron microscope or something similar to measure the cross-sectional area of the fiber (the cross-sectional area of each resin component, if the fiber is formed from a plurality of resins), and at the same time indicating the type of resin (also an approximate ratio of components in the case of multiple resins) using a DSC (differential scanning calorimeter) to identify the density. For example, if a staple fabric consisting of only PET is used, a cross section is first observed to calculate the cross sectional area. Then, the fiber is measured using a DSC to identify whether the fiber is composed of a single component resin, by melting point or peak shape, and that the component is a PET core. The fineness is then calculated by calculating the mass of the fiber using the density of the PET resin and the cross-sectional area.

{0108}

As the fibers that make up the laminated nonwoven material of the present invention, the fibers commonly used in this type of product can be used without any limitation. Specific examples include various fibers, such as heat-fusible sheath-core composite fibers, thermally extendible fibers, thermally extendible fibers, shrink fibers, non-heat shrink fibers, three-dimensionally twisted fibers, potentially twisted fibers and hollow fibers. In particular, the fibers preferably comprise a thermoplastic resin. In addition, thermally non-extendible fibers and fibers without heat shrinkage are preferably hot melt. Shell-core composite fibers can be of the shell-core concentric type, shell-core eccentric, side-by-side or warped type, and preferably belong to the shell-core concentric type. In the preparation of fibers and non-woven material, an agent for destroying a liquid film or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester can be introduced into the fibers at any stage. For example, a liquid film disruption agent, or a mixture of liquid film disruption agents and an anionic surfactant such as a phosphoric acid ester can be mixed in a fiber spinning sizing agent, which is typically to be used during spinning, and the resulting mixture can be applied to fibers, or an agent for destroying a liquid film, or a mixture of an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester can eshivatsya a finishing lubricant for the fibers before or after stretching of the fibers, and the resultant mixture may be applied to the fiber. In addition, a liquid film disruption agent or an anionic surfactant such as a phosphoric acid ester can be mixed into a fiber treatment agent, which is typically used to make a non-woven material, and the resulting mixture can be coated onto the fibers, or after the fibers are formed as a nonwoven material.

{0109}

The laminated non-woven material of the present invention has a gradient of hydrophilicity and contains an agent for disrupting a liquid film or an additional anionic surfactant such as a phosphoric acid ester with disruption of a liquid film, and is thus excellent in suppressing residual liquid in response to various fiber structures . Therefore, even if a large amount of liquid is spilled onto the laminated nonwoven fabric, a passage for liquid to penetrate between the fibers is always provided, and the laminated nonwoven fabric is excellent in liquid permeability. Thus, various functions can be provided for a laminated nonwoven material without being limited by the problems of the distance between the fibers and the formation of a liquid film. For example, a laminated nonwoven fabric may be formed of multiple layers of three or more layers. In addition, the laminated non-woven material may have a flat shape, a convex-concave shape on one side or on both sides, or a shape having a variety with respect to the base fiber mass or fiber density. In addition, the laminated non-woven material of the present invention is excellent in liquid permeability by the action of an agent for destroying a liquid film, and therefore the range of options with respect to combinations with absorbent material is also extended. In addition, in the laminated nonwoven material of the present invention, an agent for breaking a liquid film may be contained in all layers or in part of the layers. The agent for destroying a liquid film is preferably contained in at least a layer on the side on which the liquid is directly received. For example, when the nonwoven material of the present invention is included as a top sheet in an absorbent article, the agent for breaking the liquid film is preferably contained in at least a layer on the surface side in contact with the skin.

{0110}

In the laminated nonwoven material of the present invention, the liquid film disruption agent is preferably localized at least around a portion of the points at which the fibers are intertwined with each other or the points at which the fibers are fused to each other. The term “localization” of a liquid film disruption agent as used herein means a state in which the liquid film disruption agent does not adhere uniformly to the entire surface of the fibers that make up the laminated nonwoven material, but the liquid film disruption agent adheres locally to them near points in which the fibers are intertwined with each other or points at which the fibers are fused with each other, and not over the entire surface of the fibers. Specifically, the term can be defined as a term for which the concentration of the agent for breaking the liquid film near the points at which the fibers are intertwined with each other or the points at which the fibers are fused to each other higher than the surface of the fibers (the surface of the fibers between the interlacing points or between the points fusion). In the case, the agent for the destruction of the liquid film, present near the points at which the fibers are intertwined with each other or the points at which the fibers are fused with each other, can adhere to them so as to partially cover the space between the fibers with the centers at the weave points fibers or fiber fusion points. The concentration of the agent for the destruction of the liquid film near the points at which the fibers are intertwined with each other or the points at which the fibers are fused with each other is preferably as high as possible. This concentration varies depending on the type of agent for destroying the liquid film to be used, on the type of fiber to be used or on the effective fraction of the components when the agent is mixed with other agents, or something similar and, for this reason, cannot be determined unambiguously, but from the point of view of demonstrating the above effect of the destruction of the liquid film, the concentration can be determined accordingly.

The localization of the agent for the destruction of the liquid film simplifies the further development of the impact of the destruction of the liquid film. That is, the area near the points at which the fibers are intertwined with each other or the points at which the fibers are fused to each other is a place in which a liquid film is especially easily formed, and for this reason, a greater amount of breakdown agent is present at this place liquid films for easy direct interaction with the liquid film.

Such localization, the agent for disrupting the liquid film is preferably present at 30% or more, more preferably at 40% or more, and even more preferably at 50% or more in places near points at which the fibers are intertwined with each other or points at which fibers are fused to each other from the entire laminated non-woven material. In a laminated non-woven material at a place where the distance between the fiber weave points or the distance between the fiber fusion points is relatively small, the space between the fibers is small, and a liquid film is especially easily formed therein. For this reason, if the agent for destroying a liquid film is selectively localized near points at which the fibers are interwoven with each other or points at which the fibers are fused to each other, in a place where the space between the fibers is small, the effect of destruction of the liquid film develops especially effective, and such a case is preferred. In addition, in the case of selective localization, as described above, it is preferable to adjust the coating ratio of the agent for destroying the liquid film, so that the coating ratio of the agent for destroying the liquid film for a relatively small space between the fibers increases, and the coating ratio of the agent for destroying the liquid film for a relatively large space between the fibers is reduced. Thus, although the permeability of the liquid is retained in the laminated non-woven material, the effect of fracture can effectively develop in that part in which the capillary force is high and a liquid film is easily formed, and the effect of reducing the residual liquid in the laminated non-woven material is generally improved. The term `` relatively small inter-fiber space '' as used herein refers to inter-fiber space having an inter-fiber distance of 1/2 or less with respect to the inter-fiber distance determined (in the method for measuring the inter-fiber distance) discussed above.

{0111}

(Method for confirming the localized state of an agent for destruction of a liquid film)

The above-described localized state of the agent for destroying a liquid film can be confirmed using the following method.

First, the laminated nonwoven material is cut into pieces of 5 mm × 5 mm, and the piece is attached to the sample table using carbon tape. The sample table is placed in a scanning electron microscope (S4300SE / N, manufactured by Hitachi, Ltd.) in a state without vapor deposition and is placed in a low vacuum or vacuum state. Localization is detected using a ring electron reflection detector (add-on). When the atomic number is large, reflected electrons are emitted even more easily. Thus, the part coated with the agent for breaking the liquid film containing a large number of oxygen atoms or silicon atoms looks white, while the oxygen atoms or silicon atoms each have a higher atomic number compared to carbon atoms or hydrogen atoms, which mainly comprise polyethylene (PE), polypropylene (PP) or polyester (PET). For this reason, a localized state can be confirmed by whiteness. In addition, the whiteness increases when the atomic number increases or the bonding increases.

{0112}

In addition, upon receipt of the laminated nonwoven material according to the present invention, you can use the method commonly used for this type of product. For example, as a method of forming a web of fibers, it is possible to use the carding method, the dry air molding method, the spunbond method, or the like. As a method of processing a web of fibers into non-woven material, various methods of forming non-woven materials that should normally be used, such as sewing, needle punching, chemical bonding, and dot embossing, can be used. First of all, from the point of view of texture, the non-woven material is preferably a non-woven material obtained by binding by blowing air, or a non-woven material spunbond. “Non-woven fabric obtained by bonding by air blowing”, as used herein, means a laminated non-woven material that is produced by a step of pressurizing a fluid at 50 ° C. or more, for example, gas and water vapor, onto a fabric or onto a non-woven fabric (air purge treatment step). In addition, “non-woven spunbond material” means a laminated non-woven material that is produced using the spunbond method. Laminated non-woven material includes not only material that is obtained only in the above stage, but also such material that is obtained by adding the above processing step to the laminated non-woven material that is obtained using any other method, or that obtained by stages of some kind after the above stage. In addition, the laminated non-woven fabric of the present invention is not limited to a material formed only from non-woven fabric obtained by bonding by air blowing, or only from non-woven fabric spunbond, but also includes a material formed as a composite of non-woven fabric obtained by bonding by air blowing or non-woven spunbond material with a sheet of fiber or with a film material such as other non-woven materials.

{0113}

In the method for producing a laminated nonwoven material of the present invention, when an agent for breaking a liquid film of the present invention after forming the nonwoven material is applied to it, as discussed above, specific examples include a method in which a nonwoven material from starting materials is immersed in a solution containing an agent for destruction of the liquid film. Specific examples of the solution include a solution in which an agent for breaking a liquid film is diluted with a solvent (below, this solution is also referred to as a solution of an agent for breaking a liquid film). In addition, specific examples of another method include a method in which an agent for destroying a liquid film by itself or a solution containing an agent for destroying a liquid film is applied as a coating to a non-woven material from raw materials. In addition, an anionic surfactant such as phosphoric acid ester can be mixed with a solution containing an agent for disrupting a liquid film. In this case, the proportion of the content of the agent for destroying the agent for destroying the liquid film with respect to the anionic surfactant of the phosphoric acid ester type is preferably as described above. As a solvent, a solvent can be used without any limitation, in which an agent for breaking a liquid film having a significantly low solubility in water can be moderately dissolved or dispersed and emulsified to easily apply the agent in the form of a coating on a non-woven material. Specific examples of a solvent that dissolves the agent include an organic solvent such as ethanol, methanol, acetone and hexane, or when the agent is converted to a liquid emulsion, water, of course, can also be used as a solvent or dispersing medium, and specific examples of an emulsifying agent, The emulsifying agent used includes various surfactants, including phosphoric acid alkyl ester, fatty acid amide, alkyl betaine and sodium alkyl sulfosuccinate. In addition, a nonwoven fabric made from starting materials means a nonwoven fabric prior to applying an agent for destroying a liquid film thereon, and as a method for producing it, a production method that should normally be used as described above can be used without any limitation.

As a coating method for applying an agent to a nonwoven fabric from raw materials, the method used in this method for producing a nonwoven fabric can be used without any limitation. Specific examples include spray coating, coating using a slit coating device, and coating using an intaglio printing system, a flexographic system, and an immersion system.

From the point of view of the above localization of the agent for destruction of the liquid film near the points at which the fibers are interwoven with each other or the points at which the fibers are fused with each other, the agent for the destruction of the liquid film is preferably applied to the nonwoven material from the starting materials after the formation of the nonwoven material and A coating method of an agent for breaking a liquid film onto a nonwoven fabric from raw materials, and not by immersion, is more preferable. Among the coating methods, a coating method using a flexographic system is particularly preferred from the point of view of even more clearly achieving localization of the agent for destroying a liquid film.

In addition, as a non-woven material from raw materials, various non-woven materials can be used without any restrictions. In particular, from the point of view of maintaining the localization of the agent for breaking the liquid film, a non-woven material in which the fiber weave points are fusion points or thermal pressing points is preferred, and the use of a non-woven material obtained by thermally bonding the fibers to each other using Above air blasting or thermal embossing is more preferred.

{0114}

An agent for destroying a liquid film, from the point of view of adhering an agent for destroying a liquid film to a nonwoven material from raw materials or to fibers, is preferably used in the form of a solution in which an agent for destroying a liquid film is diluted with a solvent, as described above. A solution containing an agent for destroying a liquid film may also be prepared separately as a separate solution as an agent for treating fibers. “Fiber treatment agent” as described herein means an agent in which an oily agent for destroying a liquid film having a significantly low solubility in water is formed in a state in which the application of the treatment to a nonwoven fabric from raw materials or to fibers. In a fiber treatment agent for using a liquid film breaking agent therein, the proportion of the liquid film breaking agent is preferably 50% by mass or less with respect to the weight of the fiber processing agent. Thus, an agent for treating fibers can be formed in a state in which an agent for destroying a liquid film in the form of an oily component is stably emulsified in a solvent. From the point of view of stable emulsification, the proportion of the agent for destroying the liquid film is more preferably 40% by mass or less, and even more preferably 30% by mass or less, relative to the mass of the fiber treating agent. In addition, from the point of view of realizing the above-described localization of the agent for destroying the liquid film in the nonwoven material by moving the agent for destroying the liquid film on the fibers at moderate viscosity after application, the proportion is preferably controlled with the proportion of content described above. From the point of view of developing a sufficient effect of the destruction of the liquid film, the proportion of the agent for the destruction of the liquid film is preferably 5% by mass or more, more preferably 15% by mass or more, and even more preferably 25% by mass or more, relative to the mass of the agent for processing fibers. In addition, a fiber treatment agent containing a liquid film breaking agent may also contain other agents in a range in which this does not adversely affect the effect of the liquid film breaking agent. For example, a fiber treatment agent may contain the anionic surfactant of the phosphoric acid ester type discussed above. The proportion of the agent for disrupting the liquid film with respect to the anionic surfactant such as phosphoric acid ester in this case is preferably the same as discussed above. In addition, the fiber treatment agent may contain an antistatic agent or an anti-friction agent used in the processing of fibers, a hydrophilizing agent to give the laminated nonwoven fabric moderate hydrophilicity, an emulsifying agent for emulsification stability, or the like.

{0115}

Next, a specific preferred aspect of the shape of the laminated nonwoven fabric of the present invention will be described.

{0116}

Specific examples of the laminated non-woven fabric of the present invention include a convex-concave laminated non-woven fabric, which consists of inserted thermoplastic fibers and has a first surface 1A and a second surface 1B located on its opposite side to it, and at least on the first surface 1A has convex-concave shape having many convex parts protruding on the side of the first surface 1A, and concave parts located between the convex parts. Also in this convex-concave laminated non-woven material, as discussed above, the laminated non-woven material contains an agent for disrupting the liquid film, and compared with the fiber layer on the side of the first surface 1A, the degree of hydrophilicity of the fiber layer on the side of the second surface 1B adjacent to it , adjustable to be higher. When this convex-concave laminated non-woven material is used as the top sheet, the side of the second surface 1B having a higher degree of hydrophilicity is preferably used as the surface side without skin contact.

In the following, a specific example of a nonwoven fabric having a convex-concave shape will be described.

Specific examples include the nonwoven fabric shown in FIG. 4, which uses heat shrink fibers (first aspect). The laminated nonwoven fabric 100 shown in FIG. 4, contains two layers: a top layer (first layer of fibers) 101 on the side of the top surface (first surface) 1A (surface in contact with skin when used as a top sheet); and a lower layer (second layer of fibers) 102 on the side of the lower surface (second surface) 1B (surface without skin contact when used as the top sheet). Furthermore, embossing is applied to it from the side of the upper surface 1A in the thickness direction, and the two layers are bonded (the part subjected to embossing is referred to as the embossed concave part (concave binding part 130). The lower layer 102 is a layer in which thermal shrinkage of heat-shrinkable fibers develops. The top layer 101 is a layer containing fibers without heat-shrinkage, and these fibers without heat-shrinkage are partially bonded in the concave bonding portion 130. Fibers es heat shrinkage include, without limitation, fibers which do not shrink when heated, the fibers that shrink to an extent at which the thermal shrinkage of shrinkable fibers in the lower layer 102 is not subjected to negative influences.

For example, a laminated nonwoven material 100 can be obtained using the starting materials and the production method described in paragraphs {0032} - {0048} JP-A-2002-187228. For example, in this preparation, embossing or the like can be used to laminate the upper layer 101 and the lower layer 102 from the side of the upper layer 101, and then the shrink fibers are heat-shrink by heat treatment. At the same time, neighboring embossed parts are attracted to each other due to shrinkage of the fibers, and the interval between them is reduced. Due to this deformation, the fibers in the upper layer 101 protrude upward on the side of the upper surface 1C with the embossed concave part 130 as a base point for forming the convex part 140. Alternatively, the upper layer is laminated on the lower layer 102 in an elongation state of the lower layer 120 in which it develops thermal shrinkage, and the stamping described above is applied. Then, when the elongated state of the lower layer 102 relaxes, the side of the upper layer 101 protrudes upward on the side of the upper surface 1A to form the convex portion 140. The embossing can be carried out using a method that should normally be used, such as thermal stamping and ultrasonic stamping. In addition, with respect to the bonding of both layers, an adhesive bonding method may be used.

{0117}

In the thus obtained laminated non-woven material 100, the upper layer 101 is pressed and bonded to be placed on the side of the lower layer 102 in the embossed concave part (concave bonding part) 103. The embossed concave part 130 is formed in the laminated non-woven material 100 in the plane direction as separate dots, and the portion surrounded by the embossed concave portion 103 is the convex portion 140 discussed above, formed by lifting the top layer 101 upward. The convex portion 140 has a three-dimensional solid Orm and generates, for example, a dome shape. The convex portion 140 formed by the manufacturing method as described above is in a state in which the fiber density is lower than the density of the fibers in the lower layer 102. The interior of the convex portion 140 may be filled with fibers, as shown in FIG. 4, or may have a formed hollow portion in which the upper layer 101 and the lower layer 102 are separated from each other. The placement in the plane of the embossed concave part 130 and the convex part 140 may be formed arbitrarily, for example, be formed in the form of a lattice. Specific examples of the grill include an arrangement in which a plurality of rows formed from a plurality of embossed concave portions 130 are aligned, and an interval for the embossed concave portions 130 in each row deviates half a step between adjacent rows. In addition, a shape on the plane of the embossed concave portion 130 may be formed, wherein the shape is formed in the form of dots, circles, in an elliptical shape, a triangular shape, a rectangular shape, or in any polygonal shape, and can be selected accordingly, arbitrarily. In addition, the embossed concave portion 130 may be formed in a linear shape in addition to the shape of the dots.

{0118}

Laminated non-woven fabric 100 has a convex-concave surface having a convex portion 140 and an embossed concave portion 130 on the side of the upper surface 1A, and for this reason, it is excellent in moldability when the laminated non-woven material 100 is elongated in the plane direction and compressive deformability when the laminated nonwoven material 100 is compressed in the thickness direction. In addition, the laminated non-woven material 100 is formed as a relatively bulky laminated non-woven material by lifting up the fibers in the upper layer 101, as described above. Thus, the user, when touching the laminated nonwoven material 100, can feel a soft and delicate texture. In addition, in an absorbent article containing a laminated nonwoven material 100 as a top sheet, in which the upper surface 1A is used as the surface in contact with the skin and the lower surface 1B is used as the surface without contact with the skin, the side of the surface in contact with the skin becomes excellent in air permeability due to the convex-concave shape having convex parts 140 and embossed concave parts 130.

In addition, the residual liquid content is reduced in the laminated nonwoven material 100 due to the combined effect of a gradient of the degree of hydrophilicity and an agent for destroying a liquid film, or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester, as discussed above. Thus, liquid permeability obtained by using a convex-concave surface and a dense embossed portion can be further improved.

{0119}

In addition, the laminated non-woven material 100 may further comprise other layers, without limitation, with a two-layer structure of the upper layer 101 and the lower layer 102. For example, a monolayer or a plurality of layers can be located between the upper layer 101 and the lower layer 102, or a monolayer or a plurality layers may be located on the side of the upper surface 1A or on the side of the lower surface in the laminated nonwoven material 100. The monolayer or the plurality of layers may be a layer containing shrink fibers, or a layer, scored without thermal shrinkage fibers.

{0120}

As other specific examples of the laminated non-woven material of the present invention having a convex-concave shape, the laminated non-woven materials 200, 300, 400, 500, 600 and 700 (second to seventh aspects) are shown below.

First, as shown in FIG. 5, the laminated non-woven fabric 200 of the second aspect has a two-layer structure comprising a hollow portion 210. All layers contain thermoplastic fibers. Laminated non-woven material 200 has a bonding portion 220 in which a first non-woven material (first layer of fibers) 201 and a second non-woven material (second layer of fibers) 202 are partially bonded by fusion. The non-bonding portion 240 surrounded by the bonding portions 220 comprises a large number of convex portions 230 in which the first non-woven fabric 201 protrudes away from the second non-woven material 202, with the formation of the hollow part 210 in the space inside it. The bonding portion 220 is a concave portion located between adjacent convex portions 230, constituting the concavity and convexity of the first surface 1A in conjunction with the convex portions 230. The laminated non-woven fabric 200 can be formed using a method that should normally be used. For example, the first non-woven material 201 is given a convex-concave shape by coupling two convex-concave rolls, and then a second non-woven material is laminated thereon to obtain a laminated non-woven material 200.

For example, when the laminated non-woven material 200 is laminated on an absorbent mass as a top sheet in which the first surface 1A is directed toward the side of the surface in contact with the skin and the laminated non-woven material 200 is used, it is excellent in liquid permeability from the side of the first surface 1A to side of the second surface 2B. Specifically, liquid penetration through the hollow portion 210 is excellent. In addition, the pressure of the user's body is applied to the convex portions 230, and the liquid in the convex portion 230 directly migrates to the second nonwoven fabric 202. Thus, the residual liquid content on the side of the first surface 1A is small.

Such an effect can occur for a long time at a higher level, due to the combined effect of a gradient of the degree of hydrophilicity and an agent for destroying a liquid film or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester, as discussed above. That is, even if long-term use is carried out or there is a large number of discharges, the passage of liquid upon penetration is ensured by the destruction of the liquid film, and therefore, liquid permeability can be sufficiently demonstrated, as described above.

{0121}

Further, as shown in FIG. 6, the laminated nonwoven fabric 300 of the third aspect contains thermoplastic fibers and comprises a first fiber layer 301 having a convex-concave shape on both sides and a second fiber layer 302 bonded to the second surface 1B of the first fiber layer 301. Laminated non-woven fabric 300 contains, in a manner identical for both layers, a convex portion 310 protruding toward the first surface 1A (surface on the side opposite to the surface on which the second fiber layer 302 is located) and a concave portion 320 deepened therein, and a plurality of convex portions 310 are arranged so that they surround the concave portions 320. The convex portions 310 and the concave portions 320 are alternately and continuously arranged in each of the various intersecting directions in a plan view of the laminated non-woven fabric the material. The first surface 1A is typically used as a surface in contact with the skin.

In the laminated non-woven material 300, the formation of a fiber web, the formation of the non-woven material and the bonding of both layers are carried out by hot air treatment at the stage of pressurization, and for this reason, the laminated non-woven material 300 is formed as bulk and having a generally low base mass. In particular, the bonding of both layers of fibers 301 and 302 is carried out by fusing the fibers to each other under the influence of hot air, and for this reason, a gap between the fibers forms in the bonded part between the fiber layers, and the liquid passage speed is high even in the concave portion 320 serving as a binding part. In addition, the laminated nonwoven fabric 300 has, on the side of the second surface 1B in the upper part of the first protruding portion 310 in the first fiber layer 301, a part 360 in which the fiber density in the second fiber layer 302 is lower than the fiber density in the first fiber layer 301 and in other parts of the second layer 302 fibers. The existence of a portion 360 having a lower fiber density makes it easier to lay in the first protruding portion 310 in the first fiber layer 301 even under low load, and for this reason, the cushioning properties of the nonwoven fabric 300 are improved. When the laminated nonwoven fabric 300 is used as the top sheet of an absorbent article , the side of the first surface 1A (namely, the side of the first fiber layer 301) is preferably used as the surface side in contact with the skin.

In addition, the laminated non-woven fabric 300 includes between the upper part of the convex part 310 and the lower part of the concave part 320, a wall part 350 connecting both parts. The wall portion 350 divides the space of the concave portion 320 and has an annular structure in a plane direction in the concave portion 320. In addition, the fibers constituting the wall portion 350 have the property of orienting the fibers and also at each point of the ring structure in the direction connecting the upper part of the convex part 310 and the lower part of the concave part 320. Thus, elasticity is generated in the wall part of all parts, and even if pressure is applied to the laminated non-woven fabric 300, the laminated non-woven fabric 300 is excellent in reducibility.

Also, in the laminated non-woven material 300, penetration is allowed during fluid passage at any time by the combined action of a gradient of the degree of hydrophilicity and an agent for destroying a liquid film or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester, as discussed above. Thus, the window of design possibilities with respect to fiber diameter and fiber density is expanded.

Upon receipt of the laminated nonwoven material 300, for example, an air purge treatment can be used in which a multi-stage hot air treatment is applied to a fiber web, while the temperature of the hot air and the speed of the hot air are controlled. For example, you can use the production method described in paragraphs {0042} - {0064} JP-A-2013-124428.

{0122}

In addition, as shown in FIG. 7, a laminated nonwoven fabric 400 of a fourth aspect is formed from a first fiber layer 401 and a second fiber layer 402 containing thermoplastic fibers. The second fiber layer 402 has a shape in which a plurality of semi-cylindrical convex portions 410 and a plurality of concave portions 420 located along the side edges of the convex portions 410 are alternately arranged on the side of the first surface 1A. The lower concave portions 430 formed from nonwoven fibers are located on the underside of the concave portions 420. The density of the fibers of the lower concave portions 430 is lower than the convex portions 410. The first fiber layer 401 is a layer partially laminated on the convex portions 410. If the laminated non-woven material 400 is collected in an absorbent article as a top sheet in which the side of the first surface 1A is used as the surface side in contact with the skin, the liquid received by the convex portion 410 is easily igriruet into the concave portion 420, and easily migrates toward the second surface 1B in the concave portion 430. Thus, the amount of residual liquid is small, and is inhibited from sticking to the skin.

Also in the laminated non-woven material 400, penetration during the passage of liquid is provided at any time by the combined action of a gradient of the degree of hydrophilicity and an agent for destroying a liquid film or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester as discussed above. Thus, the window of design possibilities with respect to fiber diameter and fiber density is expanded.

Such a laminated non-woven material 400 can be formed by moving the fibers by distributing a fluid, such as hot air, over a portion that is to be formed as a concave portion 420 relative to the fiber web.

{0123}

In addition, other preferred specific examples of the laminated nonwoven fabric of the present invention include a laminated nonwoven fabric in which a fiber layer of two adjacent fiber layers comprises a nonwoven fabric sheet 30 shown below (fifth aspect). The nonwoven sheet 30 can be bonded to a flat layer of fibers in the form of a laminated nonwoven material, or laminated on a fiber layer having a convex-concave shape in the form of a laminated non-woven material, combined along a convex-concave shape. For example, a nonwoven sheet 30 can be laminated on a second nonwoven fabric in a second aspect (FIG. 5), or laminated on a first layer (nonwoven fabric) 301 fibers in a third aspect (FIG. 6) or on a second layer (nonwoven fabric) 402 fibers in a fourth aspect (FIG. 7).

Further, as shown in FIG. 8, the nonwoven sheet 30 has a convex-concave structure in which the protruding portions 31 in the form of stripes and the recessed portions 32 that extend in one direction (Y direction) are alternately arranged. In addition, the convex-concave structure can be divided, in the thickness direction of the non-woven fabric sheet 30, into three equal parts, the upper region 50A, the lower region 30B, and the side 50C located between them.

The nonwoven sheet 30 has a plurality of fusion-connected parts 35 at the intersections of the constituent fibers 34. As shown in FIG. 9, focused on one constituent fiber 34, the constituent fiber 34 comprises, between adjacent fusion-related parts 35, a larger diameter part 37 located between two small diameter parts 36 each having a small fiber diameter. Thus, the flexibility of the nonwoven material 30 is improved, and its texture becomes satisfactory. In addition, the skin contact area for a unit of fiber is reduced, and a better dry feeling is obtained. In addition, from the point of view of flexibility, the transition point 38 from the small diameter part 36 to the large diameter part 37 is preferably in the range 1/3 of the interval T between adjacent fusion-related parts 35 and 35, while the transition point 38 is close to the fusion-connected part 35 (range T1 and T3 in FIG. 9). In addition, many combinations of the small diameter part 36 and the large diameter part 37 arranged alternately may be present in the interval T. The configuration of the small diameter part 36 and the large diameter part 37 in such a constituent fiber is formed from fibers stretched during processing by the seagull wing type to form the protruding portion 31 and the recessed portion 32. As fibers used in the above case, fibers having a high stretch ratio are preferred. Specific examples include thermally elongate fibers, in which the crystalline state of the resin changes with heating, and the length increases, as obtained using the processing step described in paragraph {0033} JP-A-2010-168715.

In addition, from the point of view of liquid permeability, the nonwoven sheet 30 is preferably formed so that the degree of hydrophilicity of the small diameter part is less than the degree of hydrophilicity of the large diameter part. This difference with respect to the degree of hydrophilicity can be formed by introducing a stretchable component (hydrophobic component) into a fiber treatment agent that adheres to the fibers. In particular, preferably, it contains a stretchable component and a hydrophilic component. Specifically, when the fibers are stretched using the gull wing type stretching treatment described above, the stretched component is distributed in the small diameter portion 35 formed by stretching, generating a difference in the degree of hydrophilicity between the small diameter part and the large diameter part. In the part of the large diameter, the hydrophilic component, which is difficult to distribute, remains in it, while the degree of hydrophilicity becomes higher compared to the part of the small diameter. Specific examples of the stretchable component include a silicone resin having a low glass transition temperature and molecular chain flexibility, and a polyorganosiloxane containing a Si — O — Si chain as the main chain is preferably used as a silicone resin.

In addition, from the point of view of the liquid permeability described above, in the nonwoven fabric 30, the fiber density in the region of the side wall of 3 ° C is preferably lower than the density of the fibers in the upper region 30A and the lower region 30B.

Also, in a laminated nonwoven material using a nonwoven sheet 30, penetration during the passage of liquid is provided at any time by the combined action of a gradient of the degree of hydrophilicity and an agent for destroying a liquid film or an agent for destroying a liquid film and an anionic surfactant such as a phosphoric acid ester as discussed above. Thus, the window of design possibilities with respect to fiber diameter and fiber density is expanded.

{0124}

Further, the laminated non-woven fabric 600 of the sixth aspect has a convex-concave shape with thermally extendable fibers. As shown in FIG. 10, a convex-concave shape is formed on the side of the first surface 1A. On the other hand, the shape on the side of the second surface 1B is flat or has a significantly lower degree of convexity-concavity compared with the side of the first surface 1A. Specifically, the convex-concave shape on the side of the first surface 1A comprises a plurality of convex parts 610 and linear concave parts 620 surrounding the convex parts 610. The concave part 620 has a compression adhesion part in which the constituent fibers of the laminated nonwoven fabric 600 are subjected to compression bonding or adhesion, and thermally elongate fibers are not elongated. The convex portion 620 is a portion in which thermally elongate fibers are thermally elongate and rise upward on the side of the first surface 1A. Accordingly, the convex portion 620 is formed as a volume portion in which the fiber density is lower compared to the concave portion 620. In addition, the linear concave parts 620 are arranged in a lattice shape, and the convex portions 610 are located in each region highlighted by the lattice in a separate manner. Thus, in the laminated non-woven material 600, the area of contact with the skin of the user is suppressed, while musty and overheating are effectively prevented. In addition, the convex portion 610 in contact with the skin is bulky due to the thermal elongation of thermally elongate fibers in the form of a soft texture. In addition, the laminated nonwoven fabric 600 may have a single layer structure or a multilayer structure of two or more layers. For example, when the laminated non-woven fabric 600 has a two-layer structure, the layer on the side of the second surface 1B preferably does not contain thermally extendible fibers or has a lower content of thermally extendible fibers than the layer on the side of the first surface 1A having a convex-concave shape. In addition, both layers are preferably bonded in the compression adhesion portion of the concave portion 620.

Also in the laminated non-woven material 600, penetration during the passage of liquid is provided at any time under the influence of an agent for breaking a liquid film or an agent for breaking a liquid film and an anionic surfactant such as the phosphoric acid ester discussed above. Thus, the window of design possibilities with respect to fiber diameter and fiber density is expanded.

Such a laminated non-woven material 600 can be obtained using the following method. First, a linear concave portion 620 is formed by thermal embossing on a fiber web. Moreover, in the concave portion 620, thermally elongated fibers are subjected to compression bonding or fusion without thermal elongation and are fixed. Then, the thermally elongate fibers present in parts other than the concave portion 610 are elongated by an air blow treatment, and a convex portion 610 is formed in the nonwoven fabric 600. Furthermore, the constituent fibers of the laminated nonwoven 600 can be mixed fibers of the above thermally extendible fibers; and thermally non-extendable and hot melt fibers. As these constituent fibers, for example, the fibers described in paragraphs {0013} and {0037} - {0040} JP-A-2005-350836, the fibers described in paragraphs {0012} and {0024} - {0046} can be used. JP-A-2011-1277258, and so on.

{0125}

Then, as shown in FIG. 11, the laminated nonwoven fabric 700 of the seventh aspect is a laminated nonwoven fabric formed from an upper layer 710 and a lower layer 720, each of which contains thermoplastic fibers. In the upper layer 710, the convex-shaped parts 730 and the concave-shaped parts 740 are arranged alternately, and the concave-shaped parts 740 have openings. The density of the fibers in the concave-shaped portion 740 is lower compared to the density of the fibers in the convex-shaped portion 730. The region in which the convex-shaped portions 730 and the concave-shaped portions 740 are arranged alternately and periodically can exist throughout or in part of the upper layer 710. When a region in which the convex-shaped portions 730 and the concave-shaped portions 740 are arranged alternately and periodically is present in the upper layer portion, this region is preferably present as the portion serving as the liquid receiving region (the region corresponding to the highlight portion) when using the laminated nonwoven material 700 as the top sheet of an absorbent article. On the other hand, the bottom layer 720 has a substantially uniform fiber density. The lower layer 720 is laminated at least in accordance with a region in which the convex-shaped parts 730 and the concave-shaped parts 740 in the upper layer 710 are alternately and periodically arranged. Thus, the laminated non-woven material 700 has bulk damping properties due to the high density of the fibers in the convex-shaped portion 730, and if the laminated non-woven material 700 is used as the top sheet of the absorbent article, fluid backflow becomes difficult. In addition, the nonwoven material 700 has a low fiber density in the concave portion 740 and is in an open state, and for this reason, the nonwoven material 700 has excellent liquid permeability, in particular liquid permeability with high viscosity.

Also in the laminated non-woven material 700, liquid penetration is provided at any time by exposure to a liquid film disruption agent or a liquid film disruption agent and an anionic surfactant such as the phosphoric acid ester discussed above. Thus, the window of design possibilities with respect to fiber diameter and fiber density is expanded.

Such a laminated nonwoven material 700 can be obtained using the method described, for example, from row 12 in the lower left column on page 6 to row 19 in the upper right column on page 8 in JP-A-H4-24263.

{0126}

The laminated non-woven material of the present invention can be applied in various fields to obtain the advantages of a soft texture and reduce residual liquid content. For example, such a material is preferably used as a top sheet, a second sheet (a sheet located between the top sheet and the absorbent mass), a backing sheet or a leak prevention sheet in an absorbent article used to absorb fluids released from the body, such as a sanitary pad , panty liner for every day, disposable diaper, urological pads; personal wipe; napkin for skin care; in addition, for wiping material for an object or the like. When the laminated nonwoven material of the present invention is used as a top sheet or a second sheet of an absorbent article, the side of the first layer of the laminated nonwoven material is preferably used as the side of the surface facing the skin.

{0127}

Regarding the base mass of the web used to produce the laminated non-woven material of the present invention, the appropriate range is selected in accordance with the specific application of the target laminated non-woven material. The base mass of the laminated non-woven material to be ultimately obtained is preferably 10 g / m ² or more and 80 g / m ² or less, and particularly preferably 15 g / m ² or more and 60 g / m ² or less .

{0128}

An absorbent article used to absorb fluid released by the body is typically provided with a top sheet, a backing sheet, and an absorbent liquid holding medium located between both sheets. As the absorbent mass and the backing sheet, when the laminated non-woven material of the present invention is used as the top sheet, the material that is usually to be used in the art can be used without any limitation. For example, as an absorbent mass, such a material can be used as it is obtained by coating it with a coating sheet such as cosmetic paper and non-woven material, a fibrous aggregate formed from fiber material such as pulp fibers, or a fibrous aggregate with a polymer super absorbent in him. As the backing sheet, a thermoplastic resin film or a liquid impervious or water-repellent sheet such as a laminate of a film and non-woven material can be used. The backing sheet may have water and vapor permeability. The absorbent article may be further provided with various elements in accordance with the particular application of the absorbent article. Such an element is known to those skilled in the art. For example, when an absorbent article is used for a disposable diaper or sanitary towel, one pair or two or more pairs of three-dimensional cuffs may be located on the right and left side parts of the top sheet.

{0129}

Regarding the above embodiments and aspects, the present invention further describes a laminated nonwoven material, a top sheet for an absorbent article, and an absorbent article, as described below.

{0130}

<1>

Laminated non-woven material containing two layers of fibers adjacent

where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and

the laminated non-woven material contains an agent for breaking a liquid film in at least one layer of fibers.

{0131}

<2>

Laminated non-woven material in accordance with the above paragraph <1>, where the solubility in water of the agent for the destruction of the liquid film is 0 g or more and 0.025 g or less.

<3>

The laminated non-woven material according to the above <1> or <2>, where the solubility in water of the agent for breaking the liquid film is preferably 0.0025 g or less, more preferably 0.0017 g or less, and even more preferably less than 0.0001 g; and preferably 1.0 x 10 ^-9 g or more.

{0132}

<4>

The laminated non-woven material in accordance with any of the above <1> - <3>, where the spreading coefficient of the agent for breaking the film of liquid for liquid having a surface tension of 50 mN / m is 16 mN / m or more.

{0133}

<5>

Laminated non-woven material containing two layers of fibers adjacent

where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and

the laminated nonwoven material contains a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 16 mN / m or more, for a liquid having a surface tension of 50 mN / m in at least one layer of fibers.

{0134}

<6>

The laminated non-woven material according to any of the above <1> to <5>, wherein the spreading coefficient of the agent for disrupting the liquid film or compound is more preferably 20 mN / m or more, even more preferably 25 mN / m or more, and particularly preferably 30 mN / m or more.

<7>

The laminated non-woven material in accordance with any of the above <1> to <6>, where the tension at the interface of the agent for breaking a liquid film or a liquid compound having a surface tension of 50 mN / m is preferably 20 mN / m or less , more preferably 17 mN / m or less, even more preferably 13 mN / m or less, even more preferably 10 mN / m or less, particularly preferably 9 mN / m or less, and particularly preferably 1 mN / m or less ; and more than 0 mN / m.

{0135}

<8>

The laminated non-woven material in accordance with any of the above <1> to <7>, wherein the liquid film disruption agent or compound comprises a compound having at least one kind of structure selected from the group consisting of the following structures X, XY and YXY:

where structure X denotes a siloxane chain having a structure in which any of the basic structures> C (A) - (C denotes a carbon atom, in addition, <,> and -, each, denotes a chemical bond below, hereinafter referred to the same ), -C (A) ₂ -, -C (A) (B) -,> C (A) -C (R ¹ ) <,> C (R ¹ ) -, -C (R ¹ ) (R ² ) -, -C (R ¹ ) ₂ -,> C <, -Si (R ¹ ) ₂ O- and -Si (R ¹ ) (R ² ) O- are repeated, or two or more of their species are combined; or a mixed chain of them; structure X contains at the end of structure X, a hydrogen atom or at least one type of group selected from the group consisting of -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 and -Si (R ¹ ) ₂ (R ² ),

where R ¹ and R ² each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group and a halogen atom; A and B each independently represent a substituent containing an oxygen atom or a nitrogen atom; when there are many R ¹ , R ² , A and B, for each of them, X in the structure may be the same or different; and

Y represents a hydrophilic group having hydrophilicity, the group contains an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom or a sulfur atom; and when the set Y exists, these groups may be the same or different.

<9>

The laminated non-woven material according to <8> above, wherein A and B are each independently a hydroxy group, a carboxylic acid group, an amino group, an amido group, an imino group or a phenolic group.

<10>

The laminated non-woven material in accordance with any of the above <1> to <9>, wherein the liquid film disruption agent or compound comprises a compound consisting of a siloxane chain in which structures represented by any of the following Formulas (1) to ( 11) are combined arbitrarily:

where in Formulas (1) to (11), M ¹ , L ¹ , R ²¹ and R ²² denote the following monovalent or polyvalent (divalent or higher valency) group. R ²³ and R ²⁴ denote the following monovalent or polyvalent (divalent or higher valency) group or single bond;

M ¹ denotes a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a group containing a polyoxyalkylene group in combination with them, an erythritol group, a xylitol group, a sorbitol group, a glycerol group, an ethylene glycol group, a hydroxy group, a carboxylic acid group, a mercapto group, an alkoxy amino group group, amide group, imino group, phenolic group, sulfonic acid group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetainic group, phosphobetaino th group, an imidazolium betaine karbobetainovuyu group, an epoxy group, a carbinol group, a (meth) acrylic groups or a functional group in combination with them; when M ¹ is a polyvalent group, M ¹ is a group formed by further removing one or more hydrogen atoms from each of the groups or from the functional group.

L ¹ represents a linking group from an ether group, an amino group (the amino group used as L ¹ is represented by> NR ^C (R ^C represents a hydrogen atom or a monovalent group)), an amide group, an ester group, a carbonyl group or carbonate group; and

R ²¹ , R ²² , R ²³ and R ²⁴ each independently represent an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with them, or a halogen atom.

<11>

The laminated non-woven material in accordance with any of the above <1> to <10>, where the agent for breaking the liquid film or compound preferably contains a modified silicone having a structure containing at least one oxygen atom in the modified group, and more preferably polyoxyalkylene-modified silicone.

<12>

Laminated non-woven material in accordance with the above paragraph <11>, where the polyoxyalkylene-modified silicone is represented by any of the following Formulas [I] - [IV]:

where R ³¹ denotes an alkyl group; R ³² is a single bond or an alkylene group; a plurality of R ³¹ and a plurality of R ³² may each be the same or different; M ¹¹ denotes a group containing a polyoxyalkylene group, and a polyoxyalkylene group is preferred; the polyoxyalkylene group is a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a material in which their constituent monomers are copolymerized, or the like; m and n each independently represent an integer of 1 or more.

<13>

A laminated nonwoven material comprising a polyoxyalkylene-modified silicone having a structure represented by any of the following Formulas [I] to [IV], and a solubility in water of 0 g or more and 0.025 g or less:

where R ³¹ denotes an alkyl group; R ³² is a single bond or an alkylene group; a plurality of R ³¹ and a plurality of R ³² may each be the same or different; M ¹¹ denotes a group containing a polyoxyalkylene group, and a polyoxyalkylene group is preferred; the polyoxyalkylene group is a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a material in which their constituent monomers are copolymerized or the like; m and n each independently represent an integer of 1 or more.

<14>

Laminated nonwoven material according to any of the above <11> to <13>, wherein the polyoxyalkylene-modified silicone is any compound of polyoxyethylene (POE) polyoxypropylene (POP) -modified silicone, polyoxyethylene (POE) -modified silicone and polyoxypropylene (POP) -modified silicone.

<15>

The laminated non-woven material according to any of the above <11> to <13>, wherein the additional moles of polyoxyalkylene groups of the polyoxyalkylene-modified silicone is preferably 1 or more, more preferably 3 or more, and even more preferably 5 or more ; and preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less.

{0136}

<16>

Laminated non-woven material in accordance with any of the above <1> - <3>, where the agent for the destruction of the liquid film has a spreading coefficient of more than 0 mN / m for a liquid having a surface tension of 50 mN / m and a tension at the interface 20 mN / m or less, for a liquid having a surface tension of 50 mN / m.

{0137}

<17>

Laminated non-woven material containing two layers of fibers adjacent

where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and

the laminated non-woven material contains a compound having a solubility in water of 0 g or more and 0.025 g or less, a spreading coefficient of more than 0 mN / m for a liquid having a surface tension of 50 mN / m, and a tension at the interface of 20 mN / m or less , for a liquid having a surface tension of 50 mN / m in at least one layer of fibers.

{0138}

<18>

Laminated non-woven material in accordance with the above paragraph <16> or <17>, where the tension at the interface is an agent for breaking a liquid film or a liquid compound having a surface tension of 50 mN / m, preferably 17 mN / m or less, more preferably 13 mN / m or less, even more preferably 10 mN / m or less, particularly preferably 9 mN / m or less, and particularly preferably 1 mN / m or less; and greater than 0 mN / m.

<19>

The laminated non-woven material in accordance with any of the above <16> - <18>, where the spreading coefficient of the agent for the destruction of the liquid film or fluid connection having a surface tension of 50 mN / m, preferably is 9 mN / m or more, more preferably 10 mN / m or more, and even more preferably 16 mN / m or more; and 50 mN / m or less.

<20>

Laminated non-woven material in accordance with any of the above paragraphs <16> - <19>, where the agent for breaking the liquid film or compound contains a compound having at least one kind of structure selected from the group consisting of the following structures Z, ZY and yzy:

where Z denotes a hydrocarbon chain having a structure in which any of the basic structures> C (A) - (C: carbon atom), -C (A) ₂ -, -C (A) (B) -,> C ( A) -C (R ³ ) <,> C (R ³ ) -, -C (R ³ ) (R ⁴ ) -, -C (R ³ ) ₂ - and> C <, or two or more of their species are combined ; structure Z has, at one end thereof, a hydrogen atom or at least one type of group selected from the group consisting of —C (A) ₃ , —C (A) ₂ B, —C (A) (B) _{2 ,} -C (A) ₂ -C (R ³ ) ₃ , -C (R ³ ) ₂ A and -C (R ³ ) ₃ ;

R ³ and R ⁴ each independently represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, or a hydrocarbon group in combination with them, or a fluorine atom; A and B, each independently, is a substituent containing an oxygen atom or a nitrogen atom; and

Y denotes a hydrophilic group having hydrophilicity, a hydrophilic group contains an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom and a sulfur atom; and when the set Y exists, these groups may be the same or different.

<21>

Laminated non-woven material in accordance with paragraph <20> above, wherein Y is any group of a hydroxy group, a carboxylic acid group, an amino group, an amide group, an imino group, and a phenolic group; polyoxyalkylene group; any group from the erythritol group, xylitol group, sorbitol group, glycerol group and ethylene glycol group; any group from the sulfonic acid group, sulfate group, phosphoric acid group, sulfobetainic group, carbobetainic group, phosphobetainic group, quaternary ammonium group, imidazolium betaine group, epoxy group, carbinol group and methacrylic group; or a hydrophilic group is formed from a combination thereof.

<22>

A laminated nonwoven fabric according to any one of the above <16> to <21>, wherein the liquid film disruption agent or compound comprises a polyoxyalkylene alkyl ether or a hydrocarbon compound containing 5 or more carbon atoms.

<23>

Laminated non-woven material in accordance with any of the above <16> to <22>, wherein the liquid film disruption agent or compound comprises a polyoxyalkylene alkyl (POA) ether represented by any of the formulas in the following Formula [V]; or any compound of polyoxyalkylene glycol, Steareth, Beheneth, PPG myristyl ether, PPG stearyl ether and PPG behenyl ether, which are represented by the following Formula [VI] and have a molecular weight of 1000 or more:

where 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 or a polyoxybutylene group or a polyoxyalkylene group in combination with them; R ⁵¹ is a substituent of such substituents as 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 a group, a phenyl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with them, or a fluorine atom; a, b, m, and n, each independently, are an integer of 1 or more. C _m H _n, as used herein, is an alkyl group (n = 2m + 1), and C _a H _b is an alkylene group (a = 2b); the number of carbon atoms and the number of hydrogen atoms, each independently determined in each of the formulas [V] and [VI], and they are not always an identical integer, and they can be different; '' m '' in - (C _a H _b O) _m - is an integer of 1 or more; and the values of the repeating units, each, are independently determined in each of Formulas [V] and [VI], and they are not always an identical integer, and they can be different.

<24>

A laminated nonwoven material according to any one of the above <16> to <23>, wherein the liquid film disruption agent or compound contains a compound containing a polyoxyalkylene group,

where the number of moles of the polyoxyalkylene group is 1 or more and 70 or less, more preferably 5 or more, and even more preferably 7 or more; and preferably 70 or less, more preferably 60 or less, and even more preferably 50 or less.

<25>

The laminated non-woven material in accordance with any of the above <16> to <24>, wherein the liquid film breaking agent or compound comprises a hydrocarbon compound containing 5 or more; and preferably 100 or less, and more preferably 50 or less, carbon atoms.

<26>

Laminated non-woven material in accordance with the above paragraph <25>, where the hydrocarbon compound is not a polyorganosiloxane.

<27>

Laminated non-woven material in accordance with the above paragraph <25> or <26>, where the hydrocarbon compound is represented by any of the following Formulas [VII] - [XV]:

where in Formulas [VIII-I] - [XV], m, m ', m'', n, n' and n '', each independently represents an integer equal to 1 or more; the set m or the set n, each, may be the same or different; and in Formula [X], R ⁵² denotes a straight chain or branched chain, or a saturated or unsaturated hydrocarbon group containing 2 or more and 22 or less carbon atoms.

<28>

Laminated non-woven material in accordance with any of the above paragraphs <16> - <27>, where the spreading coefficient of an agent for breaking a liquid film or a liquid compound having a surface tension of 50 mN / m is 9 mN / m or more, solubility in water, an agent for destroying a liquid film or compound is 0 g or more and 0.025 g or less, a tension at the interface of an agent for destroying a liquid film or compound for a liquid having a surface tension of 50 mN / m is 9 mN / m or less, andoverhnostnoe tension agent for breaking the liquid film or the compound is 32 mN / m or less.

{0139}

<29>

Laminated non-woven material in accordance with any of the above paragraphs <1> to <28>, further comprising an anionic surfactant such as phosphoric acid ester.

<30>

Laminated non-woven material in accordance with the above paragraph <29>, where the ratio of the content of the agent for the destruction of liquids to anionic surfactants such as esters of phosphoric acid is preferably from (1: 1) to (19: 1), more preferably, from (2: 1) to (15: 1), and even more preferably, from (3: 1) to (10: 1) in terms of mass ratio.

<31>

Laminated non-woven material according to the above paragraph <29> or <30>, where the anionic surfactant such as phosphoric acid ester is any substance from an ester of an alkyl ester of phosphoric acid, a dialkyl ester of phosphoric acid and an alkyl ester phosphoric acid.

<32>

The laminated non-woven material according to any of the above <29> to <31>, wherein the anionic surfactant of the phosphoric acid ester type is an alkyl ester of phosphoric acid and the alkyl ester of phosphoric acid is any of: a phosphoric acid alkyl ester having a saturated carbon chain such as phosphoric acid stearyl ester, phosphoric acid myristyl ester, phosphoric acid lauryl ester and phosphoric acid palmityl ester; from an alkyl ester of phosphoric acid having an unsaturated carbon chain, such as an oleyl ester of phosphoric acid and a palmitoleyl ester of phosphoric acid; and phosphoric acid alkyl ester having a side chain in each carbon chain.

{0140}

<33>

The laminated non-woven material in accordance with any of the above <1> to <32>, wherein the surface tension of the liquid film disruption agent is preferably 32 mN / m or less, more preferably 30 mN / m or less, even more preferably 25 mN / m or less, and particularly preferably 22 mN / m or less; and preferably 1 mN / m or more.

<34>

A laminated nonwoven material according to any one of the above <1> to <33>, wherein the weight average molecular weight of the agent for breaking a liquid film is 500 or more, more preferably 1000 or more, even more preferably 1500 or more, and especially preferably 2000 or more; and preferably 50,000 or less, more preferably 20,000 or less, and even more preferably 10,000 or less.

<35>

The laminated non-woven material according to any of the above <1> to <34>, wherein the melting temperature of the liquid film disrupting agent is preferably 40 ° C or less, and more preferably 35 ° C or less; and preferably -220 ° C or more, and more preferably -180 ° C or more.

{0141}

<36>

The laminated nonwoven material according to any of the above <1> to <35>, wherein the contact angle difference for the fibers of the two layers of fibers is preferably 5 degrees or more, more preferably 10 degrees or more, and even more preferably 15 degrees or more; and preferably 90 degrees or less.

<37>

The laminated non-woven material according to any of the above <1> to <36>, where the contact angle for the fibers of one fiber layer in these two layers of fibers is preferably 75 degrees or more, more preferably 80 degrees or more, and even more preferably 85 degrees or more; and preferably 100 degrees or less, more preferably 95 degrees or less, and even more preferably 90 degrees or less.

<38>

The laminated non-woven material according to any of the above <1> to <37>, wherein the contact angle for the fibers of the other fiber layer in these two fiber layers is preferably 20 degrees or more, more preferably 25 degrees or more, and even more preferably 30 degrees or more; and preferably less than 75 degrees, more preferably 70 degrees or less, and even more preferably 65 degrees or less.

<39>

Laminated non-woven material in accordance with any of the above paragraphs <1> to <38>, where the distance between the fibers in the laminated non-woven material is preferably 150 μm or less, and more preferably 90 μm or less; and preferably 50 μm or more, and more preferably 70 μm or more.

<40>

Laminated non-woven material in accordance with any of the above paragraphs <1> to <39>, where the fineness of the fibers in the laminated non-woven material is preferably 3.3 decitex or less, and more preferably 2.4 decitex or less; and preferably 0.5 dtex or more, and more preferably 1.0 dtex or more.

{0142}

<41>

Laminated non-woven material in accordance with any of the above paragraphs <1> to <40> containing thermoplastic fibers, where the laminated non-woven material has a first surface and a second surface located on the side opposite to it, and at least the first surface has a convex-concave shape having a plurality of convex parts protruding on the side of the first surface and concave parts located between the convex parts.

<42>

A top sheet for an absorbent article where a laminated nonwoven according to any of the above <1> to <41> is used by applying a surface having a higher degree of hydrophilicity as a side of the surface without contact with the skin.

<43>

Top sheet for absorbent article in accordance with paragraph <42> discussed above,

where the top sheet has at least two layers;

the top sheet has a plurality of concave bonding portions in which the layers are bonded to each other by pressing from the surface side in contact with the skin in a thickness direction;

the layer on the surface side without contact with the skin of the upper sheet is a formed layer in which the shrink fibers are thermally shrunk; and

the layer on the surface side in contact with the skin of the upper sheet contains fibers without heat shrinkage partially bonded in the binding part, and has convex parts protruding on the surface side in contact with the skin in the region between the concave part of the connecting parts to form a convex-concave surface of the laminated non-woven material .

<44>

Top sheet for absorbent article in accordance with paragraph <42> discussed above,

where the top sheet has a two-layer structure having a hollow portion and formed from a first nonwoven fabric on the surface side in contact with the skin and a second nonwoven fabric on the surface side without contact with the skin, and both layers contain thermoplastic fibers; and

the top sheet has a bonding part in which the first non-woven material and the second non-woven material are partially bonded by fusion, and in the non-binding part surrounded by the connecting parts, the first non-woven material has a large number of convex parts protruding in the direction from the second non-woven material with hollow parts inside it, and the connecting part is a concave part located between adjacent convex parts and forms a convex-concave shape on the surface side in contact with the skin in conjunction action with convex parts.

<45>

An upper sheet for an absorbent article according to <42> above, where the upper sheet contains (a first layer of fibers containing thermoplastic fibers and has a convex-concave shape on both sides and a second layer of fibers bonded to the surface on the surface side without contact with skin of the first layer of fibers, and contains a convex part protruding to the side of the surface in contact with the skin on the side opposite to the surface on which the second layer of fibers and the concave part deepened therein, and a plurality your convex parts are arranged so that they surround the concave parts, and the convex parts and concave parts are alternately and continuously arranged in each of the different intersecting directions in a plan view of the top sheet.

<46>

Top sheet for absorbent article in accordance with paragraph <42> discussed above,

where the top sheet contains (a first layer of fibers and a second layer of fibers that contains thermoplastic fibers, and the second layer of fibers has a shape in which many half-cylindrical convex parts and many concave parts located along the side edges of the convex parts are alternately arranged on the surface side in contact with skin;

lower concave parts containing fibers of the nonwoven fabric are located on the lower side of the concave parts, and the density of the fibers of the lower concave parts is less than the density of the fibers of the convex parts; and

the first layer of fibers is a layer partially laminated on the convex parts.

<47>

The top sheet for an absorbent product in accordance with any of the above paragraphs <42> to <46>, where one layer of two layers of the top sheet has a convex-concave structure in which protruding parts are in the form of strips and recessed parts that extend in one direction, are arranged alternately, one layer has many parts connected by fusion at the intersection of the component fibers, and focused on one component fiber, the component fiber contains between the adjacent parts fused parts of the pain its diameter located between two small diameter portions, each having a small diameter.

<48>

An absorbent article in which a top sheet for an absorbent article is used in accordance with any of the above <42> to <47>.

<49>

An absorbent article according to <48> above, where the absorbent article is a sanitary napkin.

Examples

{0143}

Below, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to them. In addition, terms such as `` part '' and ``% '' in the Examples are taken in relation to the mass, unless otherwise noted.

The surface tension, solubility in water and the tension at the interface of the agent for breaking the liquid film, and the contact angle with water for the fibers in the Examples described below are measured using the measurement method discussed above.

{0144}

(Example 1)

The convex-concave laminated nonwoven fabric shown in FIG. 4, prepared using the above method. The resulting laminated non-woven material is taken as a sample of Example 1.

Fibers without heat shrinkage and heat-fusible fibers having a fineness of 1.2 dtex are used in the upper layer (first layer of fibers), and heat-shrinkable fibers having a fineness of 2.3 dtex are used in the lower layer (second layer of fibers). The distance between the fibers in the upper layer this time is 80 μm, and the distance between the fibers in the lower layer is 60 μm. In addition, the base mass of the laminated non-woven material is 74 g / m ² .

Polypropylene glycol is pre-bonded to the fibers of the lower layer (DEFOAMER No. 1, manufactured by Kao Corporation) as a compound that is an agent for breaking a liquid film in which X in structure X is formed from a POP chain, the number of moles of the polyoxypropylene group is 52, and the molecular weight average the mass is 3000. Adhesion is carried out by adjusting the liquid film breaking agent to the state of a dilute solution prepared by dissolving the agent in an ethanol solvent e. The proportion of the content (OPU) of the agent for the destruction of the liquid film relative to the weight of the fiber is adjusted to 0.4% of the mass.

The spreading coefficient of polypropylene glycol for a liquid having a surface tension of 50 mN / m is 16.3 mN / m, and the tension at its interface for a liquid having a surface tension of 50 mN / m is 1.0 mN / m. In addition, the surface tension of the polypropylene glycol is 32.7 mN / m and the solubility in water of the polypropylene glycol is less than 0.0001 g. These numerical values are measured using the measurement method discussed above. If necessary, a solution is used as a `` liquid having a surface tension of 50 mN / m, '' and the solution is prepared by adding, to 100 g of deionized water, 3.75 μl of polyoxyethylene sorbitan monolaurate (trade name `` Leodol Super TW- L120, '' is manufactured by Kao Corporation), which is a non-ionic surfactant through the use of a micropipette (ACURA 825, manufactured by Socorex Isba SA), and the surface tension is adjusted to 50 ± 1 mN / m. In addition, the solubility in water is measured by adding the agent in portions of 0.0001 g. As a result, a sample for which dissolution is not observed even if 0.0001 g is taken as `` less than 0.0001 g '', and the sample, for which dissolution is observed at 0.0001 g, but no dissolution at 0.0002 g, is taken as `` 0.0001 g ''. Numerical values other than those given above are also measured using the same methods.

On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the upper layer.

{0145}

When the contact angle for the fibers of the upper layer is measured using the above method for measuring the contact angle, the contact angle is 67 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same way, the contact angle is 64 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 3 degrees.

{0146}

(Example 2)

The laminated nonwoven fabric of Example 2 is prepared in the same manner as in Example 1 except that the liquid film disruption agent used in Example 1 does not adhere to the fibers of the lower layer, but adheres to the fibers of the upper layer. The resulting laminated non-woven material is selected as a sample of Example 2. Accordingly, in the upper layer, the proportion of the content (OPU) of the agent for destroying the liquid film in relation to the weight of the fibers is adjusted to 0.4% by weight. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 64 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 5 degrees.

{0147}

(Example 3)

A laminated nonwoven fabric is prepared in the same manner as in Example 2 except that polyoxyethylene (POE) -modified dimethylsilicone (KF-6015, manufactured by Shin-Etsu Chemical Co., Ltd.) is used as an agent for breaking a liquid film in which X in the XY structure is formed from a dimethylsilicone chain consisting of -Si (CH ₃ ) ₂ O-, Y is formed from a POE chain consisting of - (C ₂ H ₄ O) -, the final group of the POE chain is a methyl group (CH ₃ ), the modification ratio is 20%, the number of moles of polyoxyalkylene added is is 3 and the weighted average molecular weight is 4000. The resulting laminated non-woven material is taken as a sample of Example 3. Accordingly, in the upper layer, the proportion (OPU) of the agent for breaking the liquid film relative to the weight of the fibers is adjusted to 0.4% by weight. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

The spreading coefficient of a polyoxyethylene (POE) -modified dimethyl silicone for a liquid having a surface tension of 50 mN / m is 28.8 mN / m, and the tension at the interface for a liquid having a surface tension of 50 mN / m is 0.2 mN / m In addition, the surface tension of the polyoxyethylene (POE) -modified dimethyl silicone is 21.0 mN / m and its solubility in water is less than 0.0001 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 100 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 41 degrees.

{0148}

(Example 4)

A laminated nonwoven fabric is prepared in the same manner as in Example 2 except that caprylic / capric triglyceride (COCONARD MT, manufactured by Kao Corporation) is used as an agent for breaking a liquid film in which Z in the ZY structure is * -O- CH (CH ₂ O- *) ₂ (* represents the binding part), Y is formed from the hydrocarbon chain C ₈ H ₁₅ O- or C ₁₀ H ₁₉ O-, the fatty acid composition consists of 82% caprylic acid and 18% capric acid , and the weighted average molecular weight is 550. The resulting laminated th nonwoven material is taken as a sample of Example 4. Accordingly, in the upper layer, the proportion of the content (OPU) of the agent for breaking the liquid film with respect to the weight of the fibers is adjusted to 0.4% by weight. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

The spreading coefficient of caprylic / capric triglyceride (COCONARD MT, manufactured by Kao Corporation) for a liquid having a surface tension of 50 mN / m is 8.8 mN / m, and the tension at the interface for a liquid having a surface tension of 50 mN / m is 12.3 mN / m. In addition, the surface tension of caprylic / capric triglyceride (COCONARD MT, manufactured by Kao Corporation) is 28.9 mN / m, and its solubility in water is less than 0.0001 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 94 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 35 degrees.

{0149}

(Example 5)

A laminated nonwoven fabric is prepared in the same manner as in Example 2 except that POP alkyl ether (DEFOAMER No. 8, manufactured by Kao Corporation) is used as an agent for breaking a liquid film in which a Z hydrocarbon chain is formed in the ZY structure, consisting of of -CH ₂ -, Y is formed of POP chain consisting of - (C ₃ H ₆ O) -, additional number of moles of polyoxypropylene 5 and average molecular weight of 500. The resultant laminated nonwoven fabric is taken as a sample Pr measure 4. Accordingly, in the upper layer fraction content (OPU) agent for breaking the liquid film on the weight of the fibers is adjusted to 0.4% by weight. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

The spreading coefficient POP of an alkyl ether (DEFOAMER No. 8, manufactured by Kao Corporation) for a liquid having a surface tension of 50 mN / m is 13.7 mN / m and a tension at the interface for a liquid having a surface tension of 50 mN / m is 5.9 mN / m. In addition, the surface tension of the POP alkyl ether (DEFOAMER No. 8, manufactured by Kao Corporation) is 30.4 mN / m and its solubility in water is less than 0.0001 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 62 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 3 degrees.

{0150}

(Example 6)

A laminated non-woven material is prepared in the same manner as in Example 2 except that polyoxypropylene (POP) -modified dimethylsilicone is used (obtained by carrying out a hydrosilination reaction between silicone oil and a hydrocarbon compound) as an agent for breaking a liquid film in which X in structure XY is formed from a dimethylsilicone chain consisting of -Si (CH ₃ ) ₂ O-, Y is formed from a POP chain consisting of - (C ₃ H ₆ O) -, the final group of the POP chain is a methyl group (CH ₃ ), extra the total number of moles of polyoxypropylene is 3, and the weighted average molecular weight is 4150. The resulting laminated non-woven material is taken as a sample of Example 6. Accordingly, in the upper layer, the proportion of the OPU of the liquid film breaking agent with respect to the fiber mass is adjusted to 0.4 % of the mass. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

The spreading coefficient of a polyoxypropylene (POP) -modified dimethyl silicone for a liquid having a surface tension of 50 mN / m is 25.4 mN / m, and the tension at the interface for a liquid having a surface tension of 50 mN / m is 3.6 mN / m In addition, the surface tension of polyoxypropylene (POP) -modified dimethyl silicone is 21.0 mN / m, and its solubility in water is less than 0.0001 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 96 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 37 degrees.

{0151}

(Example 7)

A laminated non-woven material is prepared in the same manner as in Example 2 except that polyoxypropylene (POP) -modified dimethylsilicone is used (obtained by carrying out a hydrosilination reaction between silicone oil and a hydrocarbon compound) as an agent for breaking a liquid film in which X in structure XY is formed from a dimethylsilicone chain consisting of -Si (CH ₃ ) ₂ O-, Y is formed from a POP chain consisting of - (C ₃ H ₆ O) -, the final group of the POP chain is a methyl group (CH ₃ ), extra the total number of moles of polyoxypropylene is 10, and the weighted average molecular weight is 4340. The resulting laminated non-woven material is taken as a sample of Example 7. Accordingly, in the upper layer, the proportion of the OPU of the liquid film breaking agent in relation to the fiber mass is adjusted to 0.4 % of the mass. On the other hand, the agent for breaking the liquid film does not adhere to the fibers of the lower layer.

The spreading coefficient of a polyoxypropylene (POP) -modified dimethyl silicone for a liquid having a surface tension of 50 mN / m is 26.9 mN / m, and the tension at the interface for a liquid having a surface tension of 50 mN / m is 1.6 mN / m In addition, the surface tension of polyoxypropylene (POP) -modified dimethyl silicone is 21.5 mN / m, and its solubility in water is 0.0002 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 74 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 15 degrees.

{0152}

(Example 8)

Polyoxyethylene (POE) -modified dimethylsilicon (KF-6015, manufactured by Shin-Etsu Chemical Co., Ltd.) used in Example 3 as an agent for breaking a liquid film is adhered to the fibers of the upper layer; and the proportion of content (OPU) in relation to the weight of the fiber is adjusted to 0.4% of the mass. In addition, polypropylene glycol (DEFOAMER No. 1, manufactured by Kao Corporation), used in Example 1 as an agent for breaking a liquid film, is adhered to the fibers of the lower layer; and the proportion of content (OPU) in relation to the weight of the fiber is adjusted to 0.4% of the mass. A laminated nonwoven fabric is prepared in the same manner as in Example 1, except for the procedure described above. The resulting laminated non-woven material is selected as a sample of Example 8.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 100 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same way, the contact angle is 64 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 36 degrees.

{0153}

(Comparative example 1)

A laminated nonwoven material is prepared in the same manner as in Example 1 except that the agent for breaking the liquid film does not adhere to the fibers of the upper layer and the lower layer. The resulting laminated non-woven material is selected as a sample of Comparative example 1.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 67 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 8 degrees.

{0154}

(Comparative example 2)

A laminated nonwoven fabric is prepared in the same manner as in Comparative Example 1, except that hydroxysulfobetaine (AMPHITOL 20HD, manufactured by Kao Corporation), which is a strong hydrophilic ampholytic surfactant, is used to hydrophilize the fibers in the lower layer. The resulting laminated non-woven material is selected as a sample of Comparative Example 2. In addition, hydroxysulfobetaine is a water-soluble ampholytic surfactant, has no interface with the liquid film and has no spreadability and, therefore, does not have the effect of breaking the liquid film.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 67 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 44 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 23 degrees.

{0155}

(Comparative example 3)

A nonwoven fabric is prepared in the same manner as in Comparative Example 1, except that dimethyl silicone oil (KF-96A-100cs, manufactured by Shin-Etsu Chemical Co., Ltd.) adheres as a surfactant to the fibers of the upper layer to increase the proportion content (OPU) in relation to the weight of the fiber is adjusted to 0.4% of the mass. The resulting non-woven material is selected as a sample of Comparative example 3.

The spreading coefficient of dimethyl silicone oil for a liquid having a surface tension of 50 mN / m is 2.4 mN / m, and the tension at its interface for a liquid having a surface tension of 50 mN / m is 26.6 mN / m. In addition, the surface tension of dimethyl silicone oil is 21.0 mN / m and its solubility in water is 0.0001 g.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 105 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same manner, the contact angle is 59 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer was 46 degrees.

{0156}

(Comparative example 4)

Polypropylene glycol (DEFOAMER No. 1, manufactured by Kao Corporation) used in Example 1 is adhered to the fibers of the upper layer and the lower layer as an agent for breaking the liquid film, wherein the proportion of the content (OPU) in relation to the weight of the fiber is brought to 0. 4% of the mass. A laminated nonwoven fabric is prepared in the same manner as in Example 1, except for the procedures described above. The resulting laminated non-woven material is selected as a sample of Comparative example 4.

When the contact angle for the fibers in the upper layer is measured using the measurement method in the same manner as in Example 1, the contact angle is 64 degrees. On the other hand, when the contact angle for the fibers in the lower layer is measured in the same way, the contact angle is 64 degrees. Accordingly, the difference in contact angles between the upper layer and the lower layer is 0 degrees.

{0157}

(Grade)

The evaluation described below is carried out using a sanitary napkin for evaluation, which is prepared by removing the top sheet from the sanitary napkin (LAURIER F Shiawase Suhada, 30 cm, manufactured by Kao Corporation in 2014) as one example of an absorbent article and laminating therein a sample for examining a laminated non-woven material (hereinafter referred to as a sample for examining a laminated non-woven material), and fixing its periphery.

{0158}

(The amount of residual liquid in the top sheet (sample for the study of laminated non-woven material)

On the surface of each sanitary napkin for evaluation, an acrylic plate is packaged having an opening for passing liquid with an inner diameter of 1 cm, and a predetermined load of 100 Pa is applied to the napkin. Under such a load, 6 g of defibrinated horse blood (prepared by adjusting the defibrinated horse blood produced by NIPPON BIO-RESEARCH LABORATORIES INC. To 8.0 cP) is poured onto it through the fluid passage in the acrylic plate. In addition, the horse blood used is regulated using a TVB-10 Viscometer, manufactured by Toki Sangyo Co., Ltd., at 30 rpm. If horse blood is able to stand up, a part with a high viscosity (red blood cells or something like that) precipitates, and a part with a low viscosity (plasma) remains as a supernatant. The mixing ratio of the parts is adjusted to obtain a viscosity of 8.0 cP. 60 seconds after all 6.0 g of defibrinated horse blood was poured onto it, the acrylic plate was removed from it. Then, measure the mass (W2) of the sample of the laminated non-woven material for research, calculate the difference (W2-W1) with the mass (W1) of the sample for the study of the laminated non-woven material, the mass of which is measured in advance, before horse blood is poured onto it. The operation described above is carried out 3 times, and the average value for 3 operations is taken as the amount of residual liquid (mg). The amount of residual fluid serves as an indicator of the extent to which the user's skin is wetted, and when the amount of residual fluid is lower, better results are obtained.

{0159}

(The fraction of the area of the liquid film)

The surface of the laminated non-woven material 30 seconds after injection into it of the above defibrinated horse blood is photographed using a VHX-1000 microscope (trade name, manufactured by KEYENCE Corporation). The surface is analyzed by a photographic image using image analysis software “NewQube” (trade name, manufactured by Nexus Co., Ltd.). In the analysis, first, the RGB color image is converted to a 256-color monochrome image. Then, the area of the part with the liquid film is calculated by performing image processing with binarization and extracting only the black part representing the liquid film. The value, expressed in terms of the percentage of the calculated area relative to the image area, is taken as a fraction of the area of the liquid film. When the fraction of the area of the liquid film is smaller, a greater effect is shown of the destruction of the liquid film between the fibers.

{0160}

(L value)

For each laminated nonwoven sample in which the amount of residual fluid was estimated using the defibrinated horse blood as described above, the L value at the position where the defibrinated horse blood was charged was measured using a hand-held NF333 spectrophotometer manufactured by Nippon Denshoku Industries Co., Ltd .

The value of L (lightness) shows that when this value is greater, the color is closer to white and it is difficult to see the redness of the top sheet (sample of laminated non-woven material). That is, an increase in L indicates that the amount of residual fluid between the fibers decreases.

{0161}

Compositions of Examples and Comparative Examples and the results of each evaluation relative to Examples and Comparative Examples are shown in the following Table 1.

{0162}

Table 1

Example 1 Example 2 Example 3 The fineness of the upper layer (first layer of fibers) 1.2 dtex 1,2 dtex 1.2 dtex The thinness of the lower layer (second layer of fibers) 2,3 dtex 2,3 dtex 2,3 dtex The distance between the fibers of the upper layer 80 microns 80 microns 80 microns The distance between the fibers of the lower layer 60 microns 60 microns 60 microns Agent contained in the top layer - PPG Mw: 3000 POE (3) - modified dimethyl silicone
(Mw: 4000) The proportion of the content of the agent contained in the upper layer relative to the weight of the fiber (% of mass) - 0.4 0.4 Contact angle for the fibers of the upper layer (degrees) 67 64 100 Agent contained in the lower layer PPG Mw: 3000 - - The proportion of the content of the agent contained in the lower layer relative to the weight of the fiber (% of mass) 0.4 - - Contact angle for the fibers of the lower layer (degrees) 64 59 59 The difference in contact angles for the fibers of the upper layer and the lower layer (degrees) 3 five 41 Agent contained in the top layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, - 16.3 28.8 Surface tension - 32,7 21.0 The tension at the interface for a liquid having a surface tension of 50 mN / m, - 1,0 0.2 Solubility in water - <0.0001 g <0.0001 g Agent contained in the lower layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, 16.3 - - Surface tension 32,7 - - The tension at the interface for a liquid having a surface tension of 50 mN / m, 1,0 - - Solubility in water <0.0001 g - - The fraction of the area of the liquid film (%) 2.1 1,5 1,0 Surface whiteness, L value 53 57 62 The amount of residual liquid surface material (mg) 188 122 87

“Mw” means molecular weight.

Table 1 (continued-1)

Example 4 Example 5 Example 6 The fineness of the upper layer (first layer of fibers) 1.2 dtex 1.2 dtex 1.2 dtex The thinness of the lower layer (second layer of fibers) 2,3 dtex 2,3 dtex 2,3 dtex The distance between the fibers of the upper layer 80 microns 80 microns 80 microns The distance between the fibers of the lower layer 60 microns 60 microns 60 microns Agent contained in the top layer Caprylic /
capric triglyceride
(Mw: 550) POP alkyl ether
(Mw: 500) POP (3) - modified dimethyl silicone
(Mw: 4150) The proportion of the content of the agent contained in the upper layer relative to the weight of the fiber (% of mass) 0.4 0.4 0.4 Contact angle for the fibers of the upper layer (degrees) 94 62 96 Agent contained in the lower layer - - - The proportion of the content of the agent contained in the lower layer relative to the weight of the fiber (% of mass) - - - Contact angle for the fibers of the lower layer (degrees) 59 59 59 The difference in contact angles for the fibers of the upper layer and the lower layer (degrees) 35 3 37 Agent contained in the top layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, 8.8 13.7 25,4 Surface tension 28.9 30,4 21.0 The tension at the interface for a liquid having a surface tension of 50 mN / m, 12.3 5.9 3.6 Solubility in water <0.0001 g <0.0001 g <0.0001 g Agent contained in the lower layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, - - - Surface tension - - - The tension at the interface for a liquid having a surface tension of 50 mN / m, - - - Solubility in water - - - The fraction of the area of the liquid film (%) 1,2 1.8 1,2 Surface whiteness, L value 59 55 59 The amount of residual liquid surface material (mg) 167 157 100

“Mw” means molecular weight.

Table 1 (continued-2)

Example 7 Example 8 Comparative Example 1 The fineness of the upper layer (first layer of fibers) 1.2 dtex 1.2 dtex 1.2 dtex The thinness of the lower layer (second layer of fibers) 2,3 dtex 2,3 dtex 2,3 dtex The distance between the fibers of the upper layer 80 microns 80 microns 80 microns The distance between the fibers of the lower layer 60 microns 60 microns 60 microns Agent contained in the top layer POP (10) - modified dimethyl silicone
(Mw: 4340) POE (3) - modified dimethyl silicone
(Mw: 4000) - The proportion of the content of the agent contained in the upper layer relative to the weight of the fiber (% of mass) 0.4 0.4 - Contact angle for the fibers of the upper layer (degrees) 74 100 67 Agent contained in the lower layer - PPG Mw: 3000 - The proportion of the content of the agent contained in the lower layer relative to the weight of the fiber (% of mass) - 0.4 - Contact angle for the fibers of the lower layer (degrees) 59 64 59 The difference in contact angles for the fibers of the upper layer and the lower layer (degrees) 15 36 eight Agent contained in the top layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, 26.9 28.8 - Surface tension 21.5 21.0 - The tension at the interface for a liquid having a surface tension of 50 mN / m, 1,6 0.2 - Solubility in water 0,0002 g <0.0001 g - Agent contained in the lower layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, - 16.3 - Surface tension - 32,7 - The tension at the interface for a liquid having a surface tension of 50 mN / m, - 1,0 - Solubility in water - <0.0001 g - The fraction of the area of the liquid film (%) 1.4 1,2 7.8 Surface whiteness, L value 58 59 41 The amount of residual liquid surface material (mg) 106 100 280

“Mw” means molecular weight.

Table 1 (continued-3)

Comparative
example 2 Comparative
example 3 Reference Example 4 The fineness of the upper layer (first layer of fibers) 1.2 dtex 1.2 dtex 1.2 dtex The thinness of the lower layer (second layer of fibers) 2,3 dtex 2,3 dtex 2,3 dtex The distance between the fibers of the upper layer 80 microns 80 microns 80 microns The distance between the fibers of the lower layer 60 microns 60 microns 60 microns Agent contained in the top layer - Dimethyl silicone oil PPG Mw: 3000 The proportion of the content of the agent contained in the upper layer relative to the weight of the fiber (% of mass) - 0.4 0.4 Contact angle for the fibers of the upper layer (degrees) 67 105 64 Agent contained in the lower layer Hydroxysulfobetaine - PPG Mw: 3000 The proportion of the content of the agent contained in the lower layer relative to the weight of the fiber (% of mass) - - 0.4 Contact angle for the fibers of the lower layer (degrees) 44 59 64 The difference in contact angles for the fibers of the upper layer and the lower layer (degrees) 23 46 0 Agent contained in the top layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, - 2,4 16.3 Surface tension - 21.0 32,7 tension at the interface for a liquid having a surface tension of 50 mN / m, - 26.6 1,0 Solubility in water - 0.0001 g <0.0001 g Agent contained in the lower layer The spreading coefficient for a liquid having a surface tension of 50 mN / m, - - 16.3 Surface tension - - 32,7 tension at the interface for a liquid having a surface tension of 50 mN / m, - - 1,0 Solubility in water > 0.0025 g - <0.0001 g The fraction of the area of the liquid film (%) 6.9 5.5 1.4 Surface whiteness, L value 42 44 58 The amount of residual liquid surface material (mg) 242 214 239

“Mw” means molecular weight.

{0163}

As shown in Table 1, in Examples 1-8, the agent for breaking the liquid film adheres to the fibers, and the contact angle in the lower layer is brought to a smaller value (namely, the degree of hydrophilicity is greater) than the contact angle in the upper layer, and therefore, when compared with Comparative Examples 1-4, the fraction of the area of the liquid film is less, the whiteness of the surface is higher and the amount of residual liquid for the surface material is also suppressed to a lower level. That is, the laminated nonwoven materials in Examples 1-8, which are specific examples of the present invention, show excellent results for all parameters for the fraction of the area of the liquid film, the whiteness of the surface and the amount of residual liquid for the surface material.

In contrast, in Comparative Examples 1 and 2, the laminated non-woven material does not contain an agent for destroying the liquid film, and thus they are inferior to the materials of Examples 1-8 in all parameters in terms of the fraction of the area of the liquid film, in whiteness of the surface and in the amount of residual liquid for surface material.

In addition, in Comparative Example 3, a surfactant that is not a liquid film breaking agent described in the present invention adheres to the fibers, and for this reason, the laminated non-woven material is inferior to the materials of Examples 1-8 in all respects, in proportion the area of the liquid film, the whiteness of the surface and the amount of residual liquid for the surface material.

In addition, in Comparative Example 4, although the laminated non-woven material has an agent for destroying the liquid film, the material does not have a gradient of the degree of hydrophilicity between the upper layer and the lower layer, and for this reason, the laminated non-woven material is inferior to the materials of Examples 1-8 in the amount of residual liquid for surface material.

As described above, for the laminated nonwoven material of the present invention, it was found that the agent for breaking the liquid film causes the destruction of the liquid film between the fibers with a decrease in the fraction of the area of the liquid film and the whiteness of the surface, and due to the gradient of the degree of hydrophilicity, the residual liquid can be suppressed to a lower level due to the suction of liquid from the upper layer (first layer of fibers) to the lower layer (second layer of fibers). That is, it has been found that for the laminated nonwoven material of the present invention, the feeling of dryness is realized at a high level. In addition, it was found that the laminated non-woven material of the present invention is a non-woven material preferred for the manufacture of an absorbent product, which satisfies both a dry feeling and a soft texture at a high level to realize a feeling of lightness and remarkable wearing comfort

{0164}

In describing the present invention as associated with the present embodiments, the authors suggest that the present invention should not be limited to any details of the description, unless otherwise indicated, but rather should be construed broadly within the spirit and scope as set forth in the appended claims. inventions.

{0165}

This application claims the priority of Japanese Patent Application No. 2015-244862, filed in Japan on December 16, 2015, which is incorporated herein by reference in its entirety.

Character Description

{0166}

1 Fibers

2 liquid film

3 Agent for destruction of the liquid film

10, 100, 200, 300, 400, 600, 700 Laminated non-woven fabric

11 The first layer of fibers

12 Second layer of fibers.

Claims (70)

1. Laminated non-woven material containing two layers of fibers located side by side, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains an agent for destroying a liquid film in at least one layer of fibers, where an agent for destroying a liquid film contains one or more compounds selected from a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 16 mN / m or more for a liquid having a surface tension of 50 mN / m; and a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of more than 0 mN / m, for a liquid having a surface tension of 50 mN / m and a tension at the interface of 20 mN / m or less, for a liquid having a surface tension of 50 mN / m; and where the difference in contact angles between the fibers of the two layers of fibers is 15 degrees or more. 2. Laminated non-woven material containing two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains an agent for destroying a liquid film in at least one layer of fibers, where an agent for destroying a liquid film contains one or more compounds selected from a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 20 mN / m or more, for a liquid having a surface tension of 50 mN / m; and a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of more than 16 mN / m, for a liquid having a surface tension of 50 mN / m, and a tension at the interface of 30 mN / m or less. 3. Laminated non-woven material containing two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains an agent for destroying a liquid film in at least one fiber layer, wherein the agent for destroying a liquid film contains a polyoxyalkylene-modified silicone having a solubility in water of 0 g or more and 0.025 g or less, and represented by a structure of any of the following Formulas [I] - [IV]:

where R ³¹ denotes an alkyl group; R ³² is a single bond or an alkylene group; a plurality of R ³¹ and a plurality of R ³² may each be the same or different; M ¹¹ denotes a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group; and m and n each independently represent an integer of 1 or more. 4. Laminated non-woven material containing two layers of fibers located side by side, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains an agent for destroying a liquid film in at least one layer of fibers, where an agent for destroying a liquid film contains one or more compounds selected from a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 0 mN / m or more for a liquid having a surface tension of 50 mN / m; an interfacial tension of 10 mN / m or less for a liquid having a surface tension of 50 mN / m and a surface tension of 30 mN / m or less. 5. Laminated non-woven material containing two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated non-woven material contains at least one layer of fibers, any one or more compounds having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 16 mN / m or more, for a liquid having a surface tension of 50 mN / m, and a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 0 mN / m or more, for a liquid having a surface tension of 50 mN / m, and a surface tension of 20 mN / m or less for liquid having a surface tension of 50 mN / m, and where Difference of the contact angles between fibers of the two layers of fibers is 15 degrees or more. 6. Laminated non-woven material containing two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains at least one layer of fibers one or more compounds selected from a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of 20 mN / m or more, for a liquid having surface tension of 50 mN / m; and a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of more than 16 mN / m, for a liquid having a surface tension of 50 mN / m and a surface tension of 30 mN / m or less. 7. Laminated non-woven material containing two layers of fibers adjacent, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven material contains in at least one layer a compound having a solubility in water of 0 g or more and 0.025 g or less, and a spreading coefficient of more than 0 mN / m for a liquid having a surface tension of 50 mN / m; an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m and a surface tension of 30 mN / m or less. 8. Laminated non-woven material according to any one of paragraphs. 1-7, where the agent for breaking the liquid film or compound contains one or more compounds selected from a compound having at least one kind of structure selected from the group consisting of the following structures X, X-Y and Y-X-Y; and a compound having at least one kind of structure selected from the group consisting of the following structures Z, Z-Y and Y-Z-Y: where structure X denotes a siloxane chain having a structure in which any of the basic structures> C (A) - (C denotes a carbon atom, in addition, <,> and -, each, denotes a chemical bond below, hereinafter referred to the same ), -C (A) ₂ -, -C (A) (B) -,> C (A) -C (R ¹ ) <,> C (R ¹ ) -, -C (R ¹ ) (R ² ) -, -C (R ¹ ) ₂ -,> C <, -Si (R ¹ ) ₂ O- and -Si (R ¹ ) (R ² ) O- are repeated, or two or more of their species are combined; or a mixed chain of them; structure X contains at the end of structure X a hydrogen atom or at least one type of group selected from the group consisting of —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 and -Si (R ¹ ) ₂ (R ² ), where R ¹ and R ² each independently represent 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 many R ¹ , R ² , A and B, for each of them, X in the structure may be the same or different; Y represents a hydrophilic group having hydrophilicity, the group contains an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom or a sulfur atom; and when the set Y exists, these groups may be the same or different; where structure Z denotes a hydrocarbon chain having a structure in which any of the basic structures> C (A) - (C: carbon atom), -C (A) ₂ -, -C (A) (B) -,> C (A) -C (R ³ ) <,> C (R ³ ) -, -C (R ³ ) (R ⁴ ) -, -C (R ³ ) ₂ - and> C <, or two or more of them are combined species; structure Z has, at one end thereof, a hydrogen atom or at least one type of group selected from the group consisting of —C (A) ₃ , —C (A) ₂ B, —C (A) (B) _{2 ,} -C (A) ₂ -C (R ³ ) ₃ , -C (R ³ ) ₂ A and -C (R ³ ) ₃ ; R ³ and R ⁴ each independently represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, or a hydrocarbon group in combination with them, or a fluorine atom; A and B, each independently, is a substituent containing an oxygen atom or a nitrogen atom. 9. The laminated non-woven material according to any one of claims 1 to 8, where the agent for the destruction of the liquid film or compound contains a compound consisting of a siloxane chain, in which the structures represented by any of the following Formulas (1) to (11) are combined randomly way:

where in Formulas (1) to (11) M ¹ , L ¹ , R ²¹ and R ²² denote the following monovalent or polyvalent (divalent or higher valency) group; R ²³ and R ²⁴ denote the following monovalent or polyvalent (divalent or higher valency) group or single bond; M ¹ is a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a group containing a polyoxyalkylene group in combination with them, an erythritol group, a xylitol group, a sorbitol group, a glycerol group, an ethylene glycol group, a hydroxy group, a carboxylic acid group, a mercapto group, an alkoxy group, an amino group, amide group, imino group, phenolic group, sulfonic acid group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetainic group, phosphobetaino th group, an imidazolium betaine karbobetainovuyu group, an epoxy group, a carbinol group, a (meth) acrylic groups or a functional group in combination with them; when M ¹ is a polyvalent group, M ¹ is a group formed by further removing one or more hydrogen atoms from each group or from a functional group; L ¹ denotes a linking group from an ether group, an amino group (the amino group used as L ¹ is represented by> NR ^C (R ^C represents a hydrogen atom or a monovalent group)), an amide group, an ester group, a carbonyl group or a carbonate group ; and R ²¹ , R ²² , R ²³ and R ²⁴ each independently represent an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group in combination with them, or a halogen atom. 10. Laminated non-woven material according to any one of paragraphs. 1-8, where the agent for the destruction of the film of liquid or compound contains polyoxyalkylene-modified silicone. 11. The laminated non-woven material according to claim 10, where the polyoxyalkylene-modified silicone is represented by any of the following Formulas [I] - [IV]:

where R ³¹ denotes an alkyl group; R ³² is a single bond or an alkylene group; a plurality of R ³¹ and a plurality of R ³² may each be the same or different; M ¹¹ is a polyoxyethylene group, a polyoxypropylene group, or a polyoxybutylene group, and m and n are each independently an integer of 1 or more. 12. Laminated non-woven material containing polyoxyalkylene-modified silicone having a structure represented by any of the following Formulas [I] - [IV], and a solubility in water of 0 g or more and 0.025 g or less:

where R ³¹ denotes an alkyl group; R ³² is a single bond or an alkylene group; a plurality of R ³¹ and a plurality of R ³² may each be the same or different; M ¹¹ is a polyoxyethylene group, a polyoxypropylene group, or a polyoxybutylene group; and m and n each independently represent an integer of 1 or more. 13. The laminated non-woven material according to p. 12, containing two layers of fibers located side by side, where one layer of fibers in these two layers of fibers has a degree of hydrophilicity higher than the degree of hydrophilicity of the other layer of fibers, and the laminated nonwoven fabric contains polyoxyalkylene-modified silicone in at least one layer of fibers. 14. Laminated non-woven material according to any one of paragraphs. 10-13, where the additional number of moles of polyoxyalkylene groups of polyoxyalkylene-modified silicone is 1 or more; and 30 or less. 15. Laminated non-woven material according to any one of paragraphs. 10-13, where the additional number of moles of polyoxyalkylene groups of polyoxyalkylene-modified silicone is 3 or more, and 10 or less. 16. The laminated non-woven material according to any one of paragraphs. 1-15, where the spreading coefficient of the agent for destroying a liquid film or a compound for a liquid having a surface tension of 50 mN / m is 9 mN / m or more, the water solubility of the agent for destroying a liquid film or compound is 0 g or more and 0.025 g or less, the surface tension of the agent for destroying the liquid film or compound for the liquid having a surface tension of 50 mN / m is 9 mN / m or less, and the surface tension of the agent for destroying the liquid film or compound is 32 mN / m and whether less. 17. Laminated non-woven material according to any one of paragraphs. 1-16, further comprising an anionic surfactant such as phosphoric acid ester. 18. The laminated non-woven material according to any one of paragraphs. 1-11 and 13-17, where the difference in contact angles for the fibers of the two layers of fibers is 5 degrees or more, and 90 degrees or less. 19. Laminated non-woven material according to any one of paragraphs. 1-11 and 13-17, where the difference in contact angles for the fibers of the two layers of fibers is 15 degrees or more, and 90 degrees or less. 20. Laminated non-woven material according to any one of paragraphs. 1-19, where the distance between the fibers in the laminated non-woven material is 50 μm or more, and 150 μm or less. 21. The laminated non-woven material according to any one of paragraphs. 1-19, where the distance between the fibers in the laminated nonwoven material is 60 μm or more, and 90 μm or less. 22. Laminated non-woven material according to any one of paragraphs. 1-21, where the fineness of the fibers in the laminated non-woven material is 0.5 dtex or more, and 3.3 dtex or less. 23. The laminated non-woven material according to any one of paragraphs. 1-21, where the fineness of the fibers in the laminated non-woven material is 1.0 decitex or more, and 2.4 decitex or less. 24. Laminated non-woven material according to any one of paragraphs. 1-23, containing thermoplastic fibers, where the laminated non-woven material has a first surface and a second surface located on the side opposite to it, and at least the first surface has a convex-concave shape having many of the convex parts protruding on the side of the first surface, and concave parts located between the convex parts. 25. A topsheet for an absorbent article, wherein a laminated nonwoven according to any one of the above items 1-24 is used by applying a surface having a higher degree of hydrophilicity as a side of the surface without contact with the skin. 26. An absorbent article that uses a top sheet for an absorbent article according to claim 25. 27. An absorbent article in which a laminated nonwoven material according to any one of paragraphs 1-24 is used as a top sheet by applying a surface having a higher degree of hydrophilicity as a side of the surface without contact with the skin. 28. The absorbent article of claim 26 or 27, wherein the absorbent article is a sanitary napkin.

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