JP2018102613A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of effectively suppressing an odor of urine or the like caused by absorption of excrement.SOLUTION: An absorbent core 40 of an absorbent article 1 contains highly absorbent polymer, and a skin-facing or non-skin-facing side of the absorbent core 40 has an uneven structure. An end area of a projection 51 in the uneven structure has a polymer absent area 43 where no highly absorbent polymer is present, and the polymer absent area contains a perfume. It is also preferable that the absorbent core 40 is covered by a liquid permeable cover sheet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  In various absorbent articles such as disposable diapers, incontinence pads and sanitary napkins, the absorbent article may be perfumed to mask the odor in order to prevent the odor generated from the absorbed excrement from being perceived. Often done. In order to enhance the effect of masking, it is necessary to increase the fragrance of the fragrance. However, if the fragrance of the fragrance is too strong, it may make the wearer or others feel bad.

  In order to enhance the masking effect by the fragrance, the fragrance is generally applied to the absorbent body in the absorbent article. However, when excrement such as urine absorbed by the absorbent body is mixed with the fragrance, another odor is generated, and the masking effect by the fragrance may be reduced.

  As a conventional technique for suppressing odor generated from excrement absorbed and held in an absorbent article by masking with a fragrance, for example, in Patent Document 1, a water-soluble fragrance that emits a scent by contact with a body fluid is provided with an embossed recess 32. There has been proposed an absorbent article that is disposed in an application range 30 formed on at least a part of the outer peripheral portion of the absorbent body 13 and is not disposed in the central portion of the absorbent body 13. By adopting this configuration, the urination area after the second time is not present in the outer peripheral portion of the absorber 13 instead of emitting a scent when there is excretion that is absorbed and held only in the central part of the absorber for the first time. When the absorption amount of the absorber 13 approaches the allowable amount, the scent is emitted. Therefore, it is described in the same literature that an appropriate diaper exchange time can be known by the scent.

JP 2014-166208 A

  However, the demand for further improvement in the quality of life has been increasing, and the odor control effect required for absorbent articles is also required to be higher than ever. Therefore, the high deodorization suppression effect exceeding the technique of patent document 1 is required.

  Therefore, the subject of this invention exists in improvement of the aromatized absorbent article, and it is providing the absorbent article which can suppress the odor resulting from the absorption of excrement in detail.

The present invention is an absorbent article having a top sheet, a back sheet, and an absorbent core disposed between both sheets,
The absorbent core includes a superabsorbent polymer, and the skin facing surface or the non-skin facing surface of the absorbent core has an uneven structure,
The tip region of the convex portion in the concavo-convex structure has a polymer non-existing region in which the superabsorbent polymer is absent, and provides an absorbent article in which a fragrance is contained in the polymer non-existing region. .

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can suppress effectively odors, such as urine odor resulting from absorption of excrement, is provided.

FIG. 1: is thickness direction sectional drawing when cut along the width direction in the center area along a longitudinal direction which shows one Embodiment of the absorbent article of this invention. FIG. 2 is a perspective view of the absorbent core in the absorbent body of the absorbent article shown in FIG. 1 with its non-skin facing surface facing upward. FIG. 3 is a cross-sectional view in the thickness direction along the width direction in the central region along the longitudinal direction of the absorbent core in the absorbent body of the absorbent article shown in FIG. 1. FIG. 4 (a) is a schematic diagram showing the mechanism by which the target odor molecule activates the olfactory receptor, and FIG. 4 (b) shows the receptor of the target odor molecule by olfactory receptor antagonism. It is a schematic diagram which shows the mechanism by which activation is inhibited.

  Below, this invention is demonstrated, referring drawings based on the preferable embodiment. The absorbent article 1 shown in FIG. 1 includes a top sheet 2 disposed on the skin facing surface side, a back sheet 3 disposed on the non-skin facing surface side, and an absorbent body 4 interposed between both sheets 2 and 3. It has a long shape in one direction having a longitudinal direction and a width direction. The absorbent article 1 includes a three-dimensional gather 5 including a water-repellent sheet 6 and an elastic member 61 fixed to the water-repellent sheet 6 on both sides in the longitudinal direction. The solid gather 5 stands up toward the wearer when worn.

  In this specification, the longitudinal direction of the absorbent article means a direction that coincides with the wearer's front-rear direction when worn. Reference to the width direction of the absorbent article means a direction substantially orthogonal to the longitudinal direction. In FIG. 1, the direction indicated by the symbol Y (Y direction) is the width direction of the absorbent article (absorber, absorbent core, three-dimensional gather). Moreover, in this specification, the thickness direction of an absorbent article is a direction shown by Z in FIG. Further, the skin facing surface is a surface directed to the skin side of the wearer when the absorbent article is worn in the absorbent article, and the non-skin facing surface is the skin side when the absorbent article is worn in the absorbent article. Is the surface facing the opposite side (usually the clothing side).

  The top sheet 2 in the absorbent article 1 is liquid permeable. One side of the top sheet 2 constitutes the skin facing surface of the absorbent article 1. On the other hand, the back sheet 3 has liquid impermeability or liquid impermeability. One surface of the back sheet 3 constitutes a surface on the non-skin facing surface side of the absorbent article 1 directed to the clothing side. The top sheet 2, the back sheet 3, and the absorbent body 4 each have a shape that is long in the same direction as the longitudinal direction of the absorbent article 1.

  An adhesive layer 10 may be provided on the surface of the absorbent article 1 on the back sheet 3 side (non-skin facing surface) depending on the specific application of the absorbent article 1. The pressure-sensitive adhesive layer 10 is used to fix the absorbent article 1 to underwear or another absorbent article when the absorbent article 1 is worn.

  The absorber 4 is sandwiched and fixed between the top sheet 2 and the back sheet 3. Both side portions along the longitudinal direction of the top sheet 2 are wound down to the non-skin facing surface side of the absorbent body 4 and are joined to the absorbent body 4 and / or the back sheet 3 between the absorbent body 4 and the back sheet 3. ing.

  The absorbent body 4 is configured by covering the absorbent core 40 with a liquid-permeable covering sheet 44 made of tissue paper or a water-permeable nonwoven fabric. The covering sheet 44 preferably covers the entire skin facing surface of the absorbent core 40. Moreover, it is preferable that the coating sheet 44 also covers the entire area of the non-skin facing surface of the absorbent core 40. Furthermore, it is preferable that the covering sheet 44 also covers the entire area of the left and right side surfaces of the absorbent core 40. In the embodiment shown in FIG. 1, one covering sheet 44 is used, and the covering sheet 44 covers the skin facing surface, the non-skin facing surface, and both side surfaces of the absorbent core 40. The covering sheet 44 covers the absorbent core 40 so that the left and right side edge regions overlap each other to form an overlapping portion 44A. In the embodiment shown in FIG. 1, the overlapping portion 44 </ b> A is formed on the non-skin facing surface of the absorbent core 40.

  An adhesive (not shown) such as a hot-melt pressure-sensitive adhesive is applied between the covering sheet 44 and the surface sheet 2 of the absorbent body 4 in a pattern such as dots, spirals or stripes. Are joined together. Similarly, an adhesive (not shown) is applied between the cover sheet 44 and the back sheet 3 in the absorbent body 4, thereby bonding them together.

  As shown in FIG. 1, the absorbent article 1 includes a pair of three-dimensional gathers 5 and 5 that stand on the wearer side on both sides along the longitudinal direction. The three-dimensional gathers 5 are arranged on both sides of the absorbent body 4 covered with the top sheet 2. Specifically, a pair of water-repellent sheets 6 and 6 for forming a three-dimensional gather having a constant width is disposed on each of both side portions along the longitudinal direction of the absorbent article 1 over substantially the entire length in the longitudinal direction. Yes. Each water-repellent sheet 6 is folded in two so that a bent portion extending along the longitudinal direction is formed. The water-repellent sheet 6 folded in two has two side edges extending along the longitudinal direction thereof, disposed on the back side of the absorbent body 4 together with the top sheet 2, and joined to the back sheet 3 together with the top sheet 2. Thereby, the fixed end portion 53 of the three-dimensional gather 5 is formed. The free end 62 of the three-dimensional gather 5 is composed of a bent portion of the water-repellent sheet 6 folded in half. The free end 62 side of the three-dimensional gather 5 is folded back toward the outside in the width direction Y along the longitudinal direction. Thereby, the free end part 62 of the three-dimensional gather 5 sees the outer side of the width direction Y, ie, the side edge 1a side of the absorbent article 1, seeing from the centerline (not shown) extended in the longitudinal direction of the absorbent article 1. Come to face.

  In the vicinity of the free end 62 of the three-dimensional gather 5, one or a plurality of elastic members 61 (two in FIG. 1) are arranged to extend in the longitudinal direction. The elastic member 61 is fixed to the water repellent sheet 6 in an extended state. The elastic member 61 is provided over substantially the entire length of the three-dimensional gather 5 in the longitudinal direction.

The absorbent article 1 has a pressing groove 7 formed in the center region in the longitudinal direction with the skin facing surface side being recessed. The compressed grooves 7 extend in the longitudinal direction of the absorbent article 1, and are arranged one by one on both sides of a center line (not shown) that bisects the absorbent article 1 into left and right.
Each pressing groove 7 extends along the longitudinal direction of the absorbent article 1. In the expression of extending along the longitudinal direction, in addition to the case where the compressed groove 7 extends linearly, the compressed groove 7 has an arc shape or other shape, but generally extends in the longitudinal direction. It is also included. The pressing grooves 7 and 7 have a symmetrical shape with respect to the center line. The pressing groove 7 can be formed, for example, in a gentle curved shape (arc shape) that is convex from the outside in the width direction Y toward the center line side. In this case, it is preferable that the position where the compressed grooves 7 and 7 are closest to each other is a central position or a position in the vicinity thereof among positions along the longitudinal direction of the absorbent article 1.

  The pressing grooves 7, 7 can be formed according to a conventional method by embossing such as embossing with or without heat, or ultrasonic embossing. For example, in the manufacturing process of the absorbent article 1, after supplying the topsheet 2 on one surface of the absorbent body 4, a predetermined portion is pushed in a concave shape from the topsheet 2 side to the absorbent body 4 side by embossing (squeezing) Thus, the compressed groove 7 can be formed in the predetermined portion. By forming the compressed groove 7 in this manner, in the compressed groove 7, both the topsheet 2 and the absorbent body 4 are recessed in the compressed groove 7. In the pressing groove 7, the top sheet 2 and the absorber 4 are integrated by heat fusion or the like. The pressing groove 7 includes a large number of deep depressions (relatively deep depressions, high embossing parts) such as rectangles, squares, rhombuses, circles, and crosses in plan view, and shallow depressions (relatively shallow depressions). Or a low embossed portion) may be alternately connected to form a continuous line as a whole, or a large number of depressions may be intermittently arranged.

  FIG. 2 shows a perspective view of the absorbent core 40 in the absorbent body 4 of the absorbent article 1 shown in FIG. The absorbent core 40 shown in the figure is turned upside down and its non-skin facing surface is directed to the upper surface. FIG. 3 shows a cross-sectional view of the absorbent core 40 in the width direction. As shown in FIG. 3, the absorbent core 40 has a first surface 40A and a second surface 40B. 40A of 1st surfaces are skin opposing surfaces, and have faced the surface sheet 2 or the intermediate sheet (not shown) side used as needed. The second surface 40B is the non-skin facing surface side and faces the back sheet 3 side.

  As shown in FIGS. 2 and 3, the absorbent core 40 is adjacent to the high basis weight portion 41 and the high basis weight portion 41 having a relatively high basis weight and a convex shape protruding toward the back sheet 3 side. And a low basis weight portion 42 having a relatively low basis weight and recessed from the back sheet 3 side toward the top sheet 2 side. The high basis weight portion 41 and the low basis weight portion 42 are integrally formed. The absorbent core 40 has an uneven structure on the non-skin facing surface side, and the skin facing surface side is a flat surface. When the non-skin facing surface side of the absorbent core 40 has an uneven structure, the absorbent core 40 is easily deformed flexibly by an external force applied from the width direction of the absorbent core 40. As a result, the fit of the absorbent article 1 is improved. “Integrally molded” means that these parts are integrated without being separated from each other without using a bonding means such as an adhesive or heat fusion, and are integrally formed from the same material. Means that When these parts are integrally molded, the body fluid has continuity that can move smoothly. A manufacturing method of the absorbent core 40 having such a structure is described in, for example, Japanese Patent Application Laid-Open No. 2013-255567.

  The absorptive core 40 is comprised from the liquid absorptive material. As the liquid-absorbing material, the same materials as those conventionally used in the technical field of absorbent articles can be used. For example, various fiber materials as the liquid-absorbing material, specifically, natural fibers such as wood pulp, cotton and hemp; synthetic fibers made of synthetic resins such as polyethylene and polypropylene; semi-synthetic fibers such as acetate and rayon, etc. Can do. These fiber materials can be used singly or in combination of two or more. In the present invention, the absorbent core 40 contains a superabsorbent polymer made of a hydrogel material that has the property of absorbing water and swelling and retaining water. In particular, as shown in FIG. 3, when the layer of the single pulp is formed on the most non-skin facing surface side, that is, the tip region of the convex portion that is the high basis weight portion 41 is composed only of pulp and is high. It is preferable to have the polymer absence region 43 in which the absorbent polymer is absent. In particular, it is preferable to have the polymer non-existing region 43 on the front end surface of the high basis weight portion 41. It is preferable to have the polymer non-existing region 43 on the tip surface of the high basis weight portion 41 because the hardness due to the superabsorbent polymer can be reduced on the non-skin facing surface of the diaper 10. The polymer non-existing region 43 is preferably present on the entire convex surface of the high basis weight portion 41 and the tip surface of the low basis weight portion 42, that is, the entire surface of the uneven structure of the non-skin facing surface. For the same reason, it is preferable that the skin-facing surface, which is a flat surface in the absorbent core 40, also has a polymer non-existing region 45 that is made of only pulp and in which no superabsorbent polymer is present. Furthermore, for the same reason, it is preferable that both side surfaces of the absorbent core 40 have a polymer non-existing region which is composed of only pulp and in which no superabsorbent polymer is present. In short, the absorbent core 40 preferably has a polymer non-existing region over the entire surface thereof. In this case, in the thickness direction Z, a region where the superabsorbent polymer is present and a region where no polymer is present may be present in part. The thickness of the polymer non-existing region is preferably 0.1 mm or more and 1 mm or less inward from the surface. Moreover, the thickness of the polymer non-existing region with respect to the thickness of the convex portion of the absorbent core 40 is preferably 0.01 mm or more, more preferably 0.03 mm or more, and preferably 0.3 mm or less, more preferably 0.2 mm or less. preferable. A manufacturing method of the absorbent core 40 having such a structure is described in, for example, Japanese Patent Application Laid-Open No. 2013-255567.

  As shown in FIG. 2, the plurality of low basis weight portions 42 extend in parallel with the longitudinal direction X of the absorbent core 40. The low basis weight portion 42 has a plurality of the low basis weight portions 42 extending in parallel with the width direction Y of the absorbent core 40. As a result, the low basis weight portion 42 has an orthogonal lattice shape extending in the longitudinal direction and the width direction of the absorbent core 40. And the high basic weight part 41 is located in the lattice formed by the low basic weight part 42. Therefore, each high basic weight part 41 is divided by the low basic weight part 42, and is independent independently. The shapes of the respective high basis weight portions 41 are substantially the same, are rectangular in plan view, and the length in the longitudinal direction X is larger than the length in the width direction Y. On the other hand, regarding the low basic weight part 42, the low basic weight part 42 extends in the longitudinal direction X and the width direction Y of the absorbent core 40 and is connected to each other to form a continuous body. The width of the low basis weight portion 42 extending in the longitudinal direction X of the absorbent core 40 and the width of the low basis weight portion 42 extending in the width direction Y of the absorbent core 40 may be the same or different. Good.

  As described above, the absorbent core 40 has a block structure including a plurality of high basis weight portions 41 having a relatively high basis weight and low basis weight portions 42 having a relatively low basis weight, and The periphery of each high basis weight portion 41 is surrounded by the low basis weight portion 42 over the entire area to form an independent block structure. Further, the outermost periphery of the block structure is surrounded by the low basis weight portion 42. The corners of the low basis weight portion 42 located at the outermost periphery of the block structure are preferably rounded to draw a convex curve toward the outside. The block structure including the high basis weight portion 41 and the low basis weight portion 42 is formed over the entire area in the longitudinal direction X and the entire width direction Y of the absorbent core 40.

  By having a block structure composed of the high basis weight portion 41 and the low basis weight portion 42, the absorbent core 40 becomes flexible in both the longitudinal direction X and the width direction Y, and is absorbed due to that. The sex core 40 tends to follow the shape of the wearer's body. Furthermore, the excreted liquid flows while being guided by the low-thickness portion having a small thickness, so that the diffusibility in the longitudinal direction and the width direction of the absorbent core 40 can be improved.

The lower limit of the basis weight of the low basis weight portion 42 relative to the basis weight of the high basis weight portion 41 is preferably 20% or more, and more preferably 30% or more. The upper limit is preferably 80% or less, and more preferably 70% or less. The lower limit of the basis weight of the high basis weight portion 41 itself is preferably 300 g / m ² or more, and more preferably 350 g / m ² or more. The upper limit is preferably 900 g / m ² or less, more preferably 800 g / m ² or less. Regarding the low basic weight part 42, the lower limit of the basic weight is preferably 100 g / m ² or more, and more preferably 150 g / m ² or more. The upper limit is preferably 500 g / m ² or less, more preferably 400 g / m ² or less. The basis weight is measured according to the method described in paragraph [0027] of JP2013-255567A.

  The high basis weight portion 41 not only has a larger basis weight than the low basis weight portion 42 but also has a larger thickness. The lower limit of the thickness of the low basis weight portion 42 relative to the thickness of the high basis weight portion 41 is preferably 30% or more, and more preferably 40% or more. The upper limit is preferably 90% or less, and more preferably 80% or less. The lower limit of the thickness of the high basis weight portion 41 itself is preferably 2 mm or more, and more preferably 3 mm or more. The upper limit is preferably 8 mm or less, more preferably 7 mm or less. Regarding the low basis weight part 42, the lower limit of the thickness is preferably 1.5 mm or more, and more preferably 2.5 mm or more. The upper limit is preferably 4.5 mm or less, and more preferably 4 mm or less. The thickness of the high basic weight part 41 and the low basic weight part 42 (longitudinal direction X, width direction Y) is measured according to the method of Paragraph [0028] of Unexamined-Japanese-Patent No. 2013-255567.

  Due to the difference between the thickness of the high basis weight portion 41 and the thickness of the low basis weight portion 42, the plurality of convex portions 51 formed of the high basis weight portion 41 on the non-skin facing surface of the absorbent core 40. And the concavo-convex structure which consists of the recessed parts 52X and 52Y which consist of the low basic weight parts 42 is formed. And as shown in FIG. 2, the edge part of the recessed part 52X extended in the longitudinal direction X of the absorbent core 40 has reached the edge 40Y in the longitudinal direction X of the absorbent core 40. As shown in FIG. Further, the end of the recess 52 </ b> Y extending in the width direction Y reaches the side edge 40 </ b> X in the width direction Y of the absorbent core 40.

  The absorbent article 1 contains a fragrance. The position containing the fragrance in the absorbent article 1 is a polymer non-existing region 43 arranged at least in the tip region of the convex portion 51 in the concavo-convex structure formed on the non-skin facing surface of the absorbent core 40. By containing the fragrance in the polymer non-existing region 43 arranged in the tip region of the convex portion 51, the fragrance diffuses throughout the absorbent core 40 through the concave portions 52X and 52Y having a continuous groove structure and absorbed. A perfume spreads over the whole property article 1, and the odor control effect resulting from the perfume becomes remarkable.

  In particular, as shown in FIG. 2, when the end of the recess 52 </ b> X extending in the longitudinal direction X of the absorbent core 40 reaches the edge 40 </ b> Y in the longitudinal direction X of the absorbent core 40, the fragrance is absorbed by the absorbent core 40. This is preferable because it can be sufficiently spread over the entire area in the longitudinal direction X. Similarly, when the end of the recess 52 </ b> Y extending in the width direction Y of the absorbent core 40 reaches the side edge 40 </ b> X in the width direction Y of the absorbent core 40, the fragrance is in the width direction Y of the absorbent core 40. This is preferable because it is sufficient for the entire area.

  By the way, it is known that the superabsorbent polymer has a deodorizing effect, and when a fragrance is present in the vicinity of the superabsorbent polymer, the fragrance is also absorbed by the superabsorbent polymer. The suppression effect of the odor caused by the fragrance may be diminished. However, in this embodiment, since the fragrance is contained in the polymer non-existing regions 43 and 45, the fragrance is hardly absorbed by the superabsorbent polymer, and as a result, the fragrance persists for a long time. There are advantages.

  In addition, since the fragrance is an oily substance, if an adhesive such as a hot melt pressure-sensitive adhesive is present in the vicinity of the fragrance, the stickiness of the adhesive may be adversely affected by the fragrance. However, in the present embodiment, no adhesive is present in the tip region of the convex portion 51, and the adhesive sandwiches the covering sheet 44 and is opposite to the fragrance (that is, the non-skin facing surface rather than the fragrance). Since it is applied to the side), there is an advantage that a decrease in the tackiness of the adhesive is effectively prevented.

  Furthermore, when the back sheet 3 is disposed on the outermost surface of the absorbent article 1 on the non-skin facing surface side, when the back sheet 3 has air permeability, it is generated from the absorbent core 40. There is a possibility that the odor leaks to the outside through the back sheet 3. Odor leakage is particularly perceived when the absorbent article 1 is worn or discarded. However, in this embodiment, since the fragrance | flavor is contained in the non-skin opposing surface side of the absorptive core 40, there also exists an advantage that the odor produced from this absorptive core 40 is suppressed effectively by a fragrance | flavor.

  In the present embodiment, the fragrance is included only in the polymer non-existing region 43 arranged in the tip region of the convex portion 51, but there is no intention to limit the portion containing the fragrance to the tip region of the convex portion 51. It is positioned that it is preferable to include a fragrance at least in the tip region of the convex portion 51. Therefore, in addition to the tip region of the convex portion 51, it is not impeded that the fragrance is included in a portion other than the region of the absorbent core 40. For example, when a polymer non-existing region exists in the recess 52 of the absorbent core 40, a fragrance may be included in the polymer non-existing region in the recess 52.

  As a method of including a fragrance in the absorbent core 40, for example, the fragrance used is diluted in an appropriate solvent (for example, water, ethanol, low-molecular hydrocarbons, polyhydric alcohols, liquid LPG gas, dimethyl ether, etc.). Examples thereof include a method of coating, spraying or impregnating a material or a stock solution itself in a polymer non-existing region.

  The fragrance used in the present invention is not particularly limited as long as the fragrance can be evaporated into the atmosphere at atmospheric pressure, and a normal fragrance that can perceive the fragrance in an environment of normal temperature and pressure is used without particular limitation. The same ones that have been conventionally used in the technical field can be used. For example, as the fragrance, a highly volatile fragrance component having a boiling point of about 250 ° C. or less, or a medium volatile fragrance component having a boiling point of about 250 to about 300 ° C. is preferably used.

  Examples of the highly volatile perfume component include anisole, benzaldehyde, benzyl acetate, benzyl alcohol, benzyl formate, isobornyl acetate, citronellal, citronellol, citronellyl acetate, paracymene, decanal, dihydrolinalool, dihydromyrcenol, dimethylphenyl carbinol, Eucalyptol, 1-carvone, geranial, geraniol, geranyl acetate, geranyl nitrile, neryl acetate, nonyl acetate, linalool, ethyl linalool, linalyl acetate, phenylethyl alcohol, α-pinene, β-pinene, γ-pinene, α- Examples include nonone, β-ionone, γ-ionone, α-terpineol, β-terpineol, terpinyl acetate, tentalome, etc., and these can be used alone or in combination of two or more. You can.

  Examples of the moderately volatile fragrance component include amylcinnamaldehyde, methyl dihydrojasmonate, isoamyl salicylate, β-caryophyllene, cedrene, cedryl methyl ether, cinnamon alcohol, coumarin, dimethylbenzylcarbinyl acetate, isoeugenol, and γ-methyl ionone. , Heliotropin, hexyl salicylate, cis-3-hexenyl salicylate, phenylhexanol, pentalide and the like, and these can be used alone or in combination of two or more.

  As a fragrance, in addition to the above-mentioned highly volatile and medium volatile fragrance components, or in addition to these fragrance components, a fragrance containing a fragrance having a rose, lavender, jasmine, or ylang-ylang fragrance Compositions can also be used. Examples of such a fragrance composition include nerol, lavandulol, jasmar, and cyclopiden, and one of these can be used alone or two or more can be used in combination.

  In addition, the fragrance is a combination of a fragrance material composed of a plurality of fragrances (fragrance composition), such as the above-described fragrance composition alone, natural essential oil, or blended base. "Adjusted" is included. For example, a fragrance composition containing a fragrance having a rose, lavender, jasmine, or ylang ylang-like fragrance can be used as the fragrance.

  In particular, the fragrance preferably contains a substance that inhibits activation of human olfactory receptors due to urine odor components (hereinafter, this substance is also referred to as “antagonist fragrance”). The antagonist is a competitive antagonist that inhibits the action by competing for the binding site, and the antagonist fragrance is the target when the binding site is the olfactory receptor 20 as shown in FIG. When the odor molecule 21 is bound to the olfactory receptor 20 and the receptor 20 is activated to transmit odor information, the target odor molecule 21 together with other molecules 22 is transmitted as shown in FIG. By application, the other molecule 22 is used to inhibit the activation of the receptor for the target odor molecule 21 and consequently to suppress the odor recognized by the individual. . That is, by using an antagonist fragrance, it is possible to achieve odor suppression by olfactory receptor antagonism. As described above, by using the antagonist fragrance, even if the fragrance of the antagonist fragrance itself is not strong, a high urine odor suppressing effect is exhibited.

  Smell suppression by olfactory receptor antagonism is different from the means of masking the target odor by the fragrance of the fragrance, even if it is a means of using other molecules as well Is done. An example of odor suppression by olfactory receptor antagonism is the case of using a substance that inhibits activation of the olfactory receptor, such as an antagonist. Applying a substance that inhibits activation to the receptor of the odor molecule that causes a specific odor inhibits the activation of the receptor to the odor molecule, and consequently suppresses the odor perceived by the individual. can do.

  As urine odor components, p-cresol and 2-methoxy-4-vinylphenol are known as typical ones. It is preferable from the viewpoint of effective odor suppression to suppress the odor of these substances by olfactory receptor antagonism. p-Cresol and 2-methoxy-4-vinylphenol are representative of odor emitted from urine after urination or urine collection or urine that has been scattered and dried, or urine odor emitted from absorbent articles left after use It is a typical one.

  In the present specification, the “urine odor” is preferably an odor emitted from urine after urination or after urine collection. For example, the “urine odor” in the present specification may be a urine odor that is scattered and dried, or a urine odor emitted from an absorbent article that is left after use. Also preferably, the “urine odor” herein is the odor of urine treated with β-glucuronidase or an extract thereof.

  In particular, the antagonistic fragrance is preferably any substance that inhibits the activation of OR9Q2, OR10G4, OR10G7, or OR2W1 as a human olfactory receptor. As a result, the activity against the urine odor component is further suppressed, and the odor finally perceived by the individual can be further suppressed. Of these olfactory receptors, by applying an antagonistic fragrance to OR9Q2 or OR2W1, an odor-inhibiting effect is exhibited specifically with respect to p-cresol. Moreover, by applying an antagonistic fragrance to OR10G4 or OR10G7, the effect of suppressing odor is exhibited specifically with respect to 2-methoxy-4-vinylphenol.

In the present invention, particularly preferred antagonist flavors include the following compounds capable of binding to OR9Q2. These compounds can be used individually by 1 type or in combination of 2 or more types.
3- (4-tert-butylphenyl) propanal (Bourgeonal)
3,7,11-trimethyldodeca-1,6,10-trien-3-ol (Nerolidol)
Methyl cedryl ketone ([1-[(1S, 2R, 5R, 7S) -2,6,6,8-tetramethyltriclo [5.3.1.0 ^1,5 ] undec-8-en-9-yl ] Etherone; Acetyl cedene)
1- (2-tert-butylcyclohexyl) oxybutan-2-ol (Ambercore)
2,2,7,7-tetramethyltricyclo [6.2.1.0 ^1,6 ] undecan-5-one (iso-Longifolaneone)

In the present invention, the following compounds that can bind to OR2W1 are also preferably exemplified as antagonistic perfumes.
(3R, 3aS, 6S, 7R, 8aS)-Octahydro-6methyy-3,6,8,8, -tetramethyl-1H-3a, 7-methanoazuleene (Methyl Cryl Ether)

In the present invention, the following compounds capable of binding to OR10G4 are also preferably exemplified as antagonistic fragrances.
5-methyl-2- (1-methylethyl) -phenol (Thymol)

In the present invention, the following compounds that can bind to OR10G7 are also preferably exemplified as antagonistic fragrances.
・ 2-Methylundecanal (Aldehyde C-12 MNA)
・ Benzoin Siam

  The above-mentioned OR9Q2 antagonist fragrance, OR2W1 antagonist fragrance, OR10G4 antagonist fragrance and OR10G7 antagonist fragrance have been known as fragrance materials until now. It has not been known that it has a function of selectively suppressing urine odor. In the present invention, the fragrance is preferably an antagonist fragrance containing at least one selected from the above-mentioned compounds as an active ingredient.

  All of the above-described antagonistic fragrances for the various olfactory receptors can be purchased and used ("Synthetic fragrance chemistry and product knowledge" augmented revised edition, Motokazu Into, Chemical Industry Daily, 2005 (See the March issue). For example, the OR9Q2 antagonist fragrance can be obtained from Firmenich S. et al. A. , Givaudan S., et al. A. , International Flavors & Fragrances Inc. , SIGMA-ALDRICH Corporation, Takasago International Corporation, Kao Corporation and the like. Alternatively, it is possible to produce the same substance as the commercial product or a composition containing the same by chemical synthesis.

  Moreover, in the absorbent article of this invention, content of a fragrance | flavor is not restrict | limited in particular, According to desired deodorizing performance, absorption performance, etc., it can set suitably. For example, 0.5 mg or more and 100 mg or less of fragrance | flavor can be included per absorbent article. In particular, when an antagonist fragrance is used as the fragrance, a relatively small content of about 0.1 mg or more and 50 mg or less is preferable in that a sufficient urine odor suppressing effect can be obtained.

  Absorbent articles to which the present invention is applied widely include various products used to absorb and retain human excreta. Examples include, but are not limited to, disposable diapers for baby and adults, incontinence pads for light incontinence, auxiliary pads used inside adult disposable diapers, sanitary napkins and panty liners. Absent.

  In the above embodiment, the uneven structure is formed on the non-skin facing surface side of the absorbent core 40. Instead, as shown in FIG. 3, the uneven structure of the absorbent core 40 shown in FIG. You may incorporate in the absorbent article 1 so that it may face the skin opposing surface side. That is, as for the absorptive core 40, the skin opposing surface may have an uneven structure. And the superabsorbent polymer does not exist in the front-end | tip area | region of the convex part in the uneven structure formed in the skin opposing surface, and the fragrance | flavor may be contained in this front-end | tip area | region.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
An absorbent article having a top sheet, a back sheet, and an absorbent core disposed between both sheets,
The absorbent core includes a superabsorbent polymer, and the skin facing surface or the non-skin facing surface of the absorbent core has an uneven structure,
The tip area of the convex part in the concavo-convex structure has a polymer non-existing area where the superabsorbent polymer is absent, and the polymer non-existing area contains a fragrance.

<2>
The concave portion in the concave-convex structure has an orthogonal lattice shape extending in the longitudinal direction and the width direction of the absorbent core,
The end of the recess extending in the longitudinal direction reaches the edge in the longitudinal direction of the absorbent core;
The absorbent article according to <1>, wherein an end of the concave portion extending in the width direction reaches a side edge in the width direction of the absorbent core.

<3>
The absorbent article according to <2>, wherein the polymer-existing region is provided in the recess.
<4>
The absorbent article according to any one of <1> to <3>, wherein the absorbent core is covered with a liquid-permeable covering sheet.
<5>
The absorbent core has the uneven structure on its non-skin facing surface,
The absorbent article according to any one of <1> to <4>, wherein the back sheet has air permeability.
<6>
The absorbent article according to any one of <1> to <5>, wherein the absorbent core includes a fiber material as a liquid-absorbing material.

<7>
The absorbent core has a relatively high basis weight and a high basis weight portion having a convex shape protruding toward the back sheet side;
<1> to <6> having a low basis weight part adjacent to the high basis weight part and having a relatively low basis weight and recessed from the back sheet side toward the top sheet side. The absorbent article of any one.
<8>
The absorbent article according to any one of <1> to <7>, wherein the high basis weight portion and the low basis weight portion of the absorbent core are integrally formed.
<9>
The absorbent article according to <7> or <8>, wherein the polymer non-existing region is present on a convex side surface of the high basis weight portion and a front end surface of the low basis weight portion.
<10>
As for the basic weight of the said low basic weight part with respect to the basic weight of the said high basic weight part, the lower limit becomes like this. Preferably it is 20% or more, More preferably, it is 30% or more, Preferably an upper limit is 80% or less. More preferably 70% or less,
The basis weight of the high basis weight part itself has a lower limit value of preferably 300 g / m ² or more, more preferably 350 g / m ² or more, and an upper limit value of preferably 900 g / m ² or less. Preferably it is 800 g / m ² or less,
As for the basic weight of the low basic weight part itself, the lower limit value of the basic weight is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and the upper limit value is preferably 500 g / m ² or less. The absorbent article according to any one of <7> to <9>, further preferably 400 g / m ² or less.
<11>
The lower limit of the thickness of the low basis weight 42 relative to the thickness of the high basis weight 41 is preferably 30% or more, more preferably 40% or more, and the upper limit is preferably 90% or less. Preferably, it is 80% or less, and the thickness of the high basis weight portion 41 itself has a lower limit value of preferably 2 mm or more, more preferably 3 mm or more, and an upper limit value of preferably 8 mm or less, more preferably. For the low basis weight portion 42, the lower limit value of the thickness is preferably 1.5 mm or more, more preferably 2.5 mm or more, and the upper limit value is preferably 4.5 mm or less. The absorbent article according to any one of <7> to <10>, more preferably 4 mm or less.

<12>
The absorbent article according to any one of <1> to <11>, wherein the polymer non-existing region is present in the entire surface of the uneven structure on the non-skin facing surface.
<13>
The absorbent article according to any one of <1> to <12>, wherein a thickness of the polymer non-existing region in the absorbent core is 0.1 mm or more and 1 mm or less inward from the surface.
<14>
The absorbent article according to any one of <1> to <13>, wherein the fragrance contains a substance that inhibits activation of a human olfactory receptor caused by a urine odor component.
<15>
The absorbent article according to <14>, wherein the fragrance contains a substance that inhibits activation of a human olfactory receptor caused by p-cresol or 2-methoxy-4-vinylphenol.
<16>
The absorbent article according to <14> or <15>, wherein the olfactory receptor is any one of OR9Q2, OR10G4, OR10G7, and OR2W1.

<17>
The fragrance is one selected from the group consisting of Bourgeonal, Nerolidol, Acetyl cedene, Ambercore, iso-Longifoloneone, Methyl Cedryl Ether, Thymol, Aldehyde C-12 MNA, and Benzoin Siam. The absorbent article according to any one of <14> to <16>.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
As an absorbent article, a light incontinence pad 50cc type (trade name: Laurier Sara Pure 50cc) manufactured by Kao Corporation was used. The absorbent core of this absorbent article was removed, and the absorbent core having the structure shown in FIGS. 1 to 3 was disposed instead. This absorbent core was manufactured by the method described in JP2013-255567A. This absorptive core had a basis weight of 400 g / m ² , the tip end region of the convex portion was composed only of pulp, and no superabsorbent polymer was present. Moreover, the skin facing surface which is a flat surface, and the area | region of the vicinity of the absorptive core were also comprised only from the pulp, and the superabsorbent polymer did not exist.
The fragrances shown in Table 1 below were used. This fragrance | flavor was apply | coated to the position of the front-end | tip area | region of the convex part in the said absorptive core. The application was performed on the tip end region of the convex portion existing in the entire area of the absorbent core.

[Example 2]
Absorbent articles produced in the same manner as in Example 1 were used except that the fragrances shown in Table 1 below were used.

[Comparative Examples 1 and 2]
As Comparative Example 1, an absorbent article containing a fragrance was used only inside the absorbent core, that is, in a region containing a superabsorbent polymer. The coating amount of the fragrance was the same as in Example 1. Moreover, the absorbent article which does not contain a fragrance | flavor as the comparative example 2 was used.

[Evaluation]
20 g of human urine was injected into the absorbent articles of each Example and each Comparative Example, and the urine odor was sensoryly evaluated according to the following criteria. The results are shown in Table 1 below.
◎: No urine odor ○: Little urine odor △: Some urine odor ×: Some urine odor

  As is clear from the results shown in Table 1, it can be seen that according to each example, the effect of suppressing odor is higher than in each comparative example.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 4 Absorber 5 Three-dimensional gather 6 Water-repellent sheet 7 Press groove 10 Adhesive layer 40 Absorbent core 41 High basis weight part 42 of absorbent core Low basis weight part 43 of absorbent core , 45 Polymer non-existing area 44 Cover sheet 51 Convex part 52X, 52Y Concave part 61 Elastic member 62 Free end part of three-dimensional gather

Claims (5)

An absorbent article having a top sheet, a back sheet, and an absorbent core disposed between both sheets,
The absorbent core includes a superabsorbent polymer, and the skin facing surface or the non-skin facing surface of the absorbent core has an uneven structure,
The tip area of the convex part in the concavo-convex structure has a polymer non-existing area where the superabsorbent polymer is absent, and the polymer non-existing area contains a fragrance. The concave portion in the concave-convex structure has an orthogonal lattice shape extending in the longitudinal direction and the width direction of the absorbent core,
The end of the recess extending in the longitudinal direction reaches the edge in the longitudinal direction of the absorbent core;
The absorbent article according to claim 1, wherein an end of the recess extending in the width direction reaches a side edge in the width direction of the absorbent core.   The absorptive article according to claim 2 which has said polymer absence field in said crevice.   The absorbent article according to any one of claims 1 to 3, wherein the absorbent core is covered with a liquid-permeable covering sheet. The absorbent core has the uneven structure on its non-skin facing surface,
The absorptive article according to any one of claims 1 to 4 in which said back sheet has air permeability.