WO2020213733A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2020213733A1
WO2020213733A1 PCT/JP2020/016967 JP2020016967W WO2020213733A1 WO 2020213733 A1 WO2020213733 A1 WO 2020213733A1 JP 2020016967 W JP2020016967 W JP 2020016967W WO 2020213733 A1 WO2020213733 A1 WO 2020213733A1
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WO
WIPO (PCT)
Prior art keywords
absorbent article
sheet
gel lotion
fiber
lotion
Prior art date
Application number
PCT/JP2020/016967
Other languages
English (en)
Japanese (ja)
Inventor
和田　一郎
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019080548A external-priority patent/JP2020174996A/ja
Priority claimed from JP2019080547A external-priority patent/JP7178951B2/ja
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to CN202080030236.3A priority Critical patent/CN113825476B/zh
Publication of WO2020213733A1 publication Critical patent/WO2020213733A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer

Definitions

  • the present invention relates to an absorbent article.
  • An absorbent article having a gel lotion application part on the skin side of the top sheet is known.
  • Patent Document 1 describes an absorbent article including a top sheet, a back sheet, and an absorbent layer arranged between the top sheet and the back sheet, and at least a part of an area in contact with the wearer's skin.
  • an absorbent article having a gel lotion containing a gelling agent such as a styrene elastomer and a lotion such as a hydrocarbon.
  • the absorbent article described in Patent Document 1 applies a lotion that protects the wearer's skin to the wearer's skin by applying a gel lotion to at least a part of the area in contact with the wearer's skin.
  • the body fluid is once absorbed by the absorbent article. Then, the surface treatment agent may be washed away by the body fluid, and the body fluid diffusivity at the time of repeated absorption may not be sufficient.
  • the absorbent article disclosed in Patent Document 1 since the gel lotion has hydrophobicity, it is arranged so as not to inhibit the absorption of the liquid, but it still has the viewpoint of liquid transferability and suppression of liquid return. There was room for improvement.
  • the present invention provides an absorbent article having excellent body fluid diffusivity during repeated absorption even if the components existing on the surface of the absorbent article are washed away by the body fluid absorbed by the absorbent article. Is the first purpose.
  • a second object of the present invention is to provide an absorbent article capable of exerting a lotion function and having an excellent liquid transfer function and liquid return suppressing function.
  • a gel lotion containing a styrene elastomer, a hydrocarbon oil, and a surfactant is applied to at least a part of the fiber sheet arranged on the skin side of the absorbent layer of the absorbent article, and the above-mentioned fibers are applied. It has been found that the above-mentioned problems can be solved by the absorbent article in which the sheet has a high fiber density portion in the region where the gel lotion is applied, and the present invention has been completed.
  • the present invention is an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer arranged between the top sheet and the back sheet.
  • the absorbent article is a region of a fiber sheet selected from the top sheet and a sheet that may be arranged between the top sheet and the absorbent layer, which overlaps with the absorbent layer in the thickness direction.
  • the gel lotion coating portion provided with at least a part thereof, the gel lotion containing a styrene elastomer, a hydrocarbon oil, and a surfactant, and the gel lotion coating portion is provided.
  • the area of the fiber sheet provides an absorbent article with a high fiber density portion where the fiber density is higher than the peripheral portion.
  • the absorbent article of the present invention can exert a lotion function and is excellent in a liquid transfer function and a liquid return suppressing function.
  • FIG. 8 is a plan view of the sanitary napkin 10 according to the embodiment of the present invention.
  • FIG. 9 is an end view of a cross section of the sanitary napkin 10 along line II-II in FIG. FIG.
  • FIG. 10 is an enlarged perspective view of a main part of the liquid permeable sheet 20 in the sanitary napkin 10.
  • FIG. 11 is an enlarged plan view of a main part schematically showing a coated portion of the gel lotion 60 on the liquid permeable sheet 20.
  • FIG. 12 is a schematic view for explaining the thin film portion 610 made of the gel lotion 60.
  • An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer arranged between the top sheet and the back sheet, wherein the absorbent article is described above.
  • the gel lotion is applied to at least a part of the region of the top sheet and the fiber sheet selected from the sheets which may be arranged between the top sheet and the absorption layer in the thickness direction with the absorption layer.
  • the area of the fiber sheet provided with the gel lotion coating portion is provided, the gel lotion contains a styrene elastomer, a hydrocarbon oil, and a surfactant, and the region of the fiber sheet provided with the gel lotion coating portion has a fiber density.
  • the absorbent article of the first aspect of the present invention is at least a part of a region of a fiber sheet selected from a top sheet and a sheet arranged between the top sheet and the absorbent layer, which overlaps with the absorbent layer in the thickness direction. Also provided with a gel lotion application portion to which the gel lotion is applied. Due to the difference in polarity between the hydrocarbon oil and the surfactant contained in this gel lotion, the surfactant easily bleeds out to the surface of the gel lotion, and is absorbed by the action of the bleed-out surfactant. Increases the diffusivity of body fluids absorbed by sex articles.
  • the surfactant is used inside the gel lotion. Supplied from, it bleeds out again to the surface of the gel lotion, thus maintaining fluid diffusivity.
  • the absorbent article of the first aspect of the present invention has a high fiber density portion in which the region of the fiber sheet provided with the gel lotion coating portion has a higher fiber density than the peripheral portion.
  • the surfactant that bleeds out to the surface of the body fluid or gel lotion easily diffuses into the high fiber density portion due to the capillary phenomenon, and the diffusivity of the body fluid is enhanced. Therefore, the absorbable article of the present invention is excellent in body fluid diffusibility during repeated absorption.
  • the gel lotion is applied to the non-skin side surface of the top sheet. Therefore, since the gel lotion is less likely to prevent the permeation of the body fluid in the top sheet, the absorbent article easily absorbs the body fluid from the entire surface of the top sheet. Therefore, the body fluid permeability of the top sheet, which is a property of permeating body fluid, is well maintained.
  • the top sheet has concave portions and convex portions alternately arranged in at least one direction, and the gel on the non-skin side surface of the concave portion is larger than the abundance of the gel lotion on the non-skin side surface of the convex portion.
  • the absorbent article according to the second aspect wherein the amount of lotion is low.
  • the non-skin side surface of the concave portion has a smaller amount of gel lotion than the non-skin side surface of the convex portion, so that the body fluid permeates from the concave portion of the top sheet toward the absorption layer.
  • Cheap Therefore, the body fluid permeability of the top sheet is increased.
  • the top sheet has protrusions and recesses that form a wavy cross-section.
  • the gel lotion is more abundant on the non-skin side surface of the convex portion than on the non-skin side surface of the concave portion, the surfactant bleeding out from the gel lotion on the non-skin side surface of the convex portion is subjected to gravity. Therefore, it easily diffuses into the recesses. As a result, the diffusivity of the body fluid is enhanced not only in the convex portion but also in the concave portion.
  • a convex portion that easily diffuses the body fluid by the action of the gel lotion and a concave portion that easily permeates the body fluid that has moved from the convex portion exist along the orthogonal directions. Since the gel lotion application portion is also arranged along the orthogonal direction, both the body fluid diffusivity during repeated absorption of the absorbent article and the body fluid permeability of the top sheet are enhanced.
  • the absorption layer embossed pattern formed on the surface of the absorption layer intersects the above-mentioned orthogonal direction with the body fluid that has passed through the top sheet and reached the surface of the absorption layer. Since it diffuses along a plurality of directions, the diffusibility of the absorbent article during repeated absorption is enhanced.
  • the convex portion that easily diffuses the body fluid and the concave portion that easily permeates the body fluid that has moved from the convex portion exist in a staggered pattern, so that the absorbent article is repeated. Both the diffusivity of body fluid during absorption and the permeability of body fluid of the top sheet are enhanced.
  • the body fluid in which the recesses are diffused is easily absorbed, so that the body fluid easily permeates the top sheet toward the absorption layer. Therefore, the body fluid diffusibility of the absorbent article during repeated absorption and the body fluid permeability of the top sheet are enhanced.
  • the surfactant from the gel lotion becomes more persistent and sustained-release, and the irritation of the gel lotion to the skin is reduced.
  • the surfactant is more likely to bleed out from the gel lotion, and the body fluid diffusibility of the absorbent article during repeated absorption is enhanced.
  • FIG. 1 is a plan view of the absorbent article 1 according to the first embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1
  • FIG. 3 is a first embodiment of the present invention. It is a perspective view of the top sheet 2 used for the absorbent article 1 in the form.
  • the absorbent article 1 of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other.
  • the "absorbent article" of the present invention is used as, for example, a tape-stopping type disposable diaper, a pants type disposable diaper, a urine absorbing pad, a light incontinence pad, a sanitary pad, a panty liner and the like.
  • the absorbent article of the present invention has a liquid permeable top sheet, a liquid permeable back sheet, and an absorbing layer arranged between the top sheet and the back sheet. Then, as shown in FIGS. 1 and 2, in the absorbent article 1 of the present embodiment, at least a part of the non-skin side surface of the top sheet 2 overlaps with the absorbent layer 4 in the thickness direction T. A gel lotion coating portion 5 coated with a gel lotion is provided along the longitudinal direction L.
  • the region of the top sheet 2 includes a high fiber density portion 8 having a higher fiber density than the peripheral portion.
  • the gel lotion provided in the absorbent article of the present invention contains a surfactant, and this surfactant has a property of easily bleeding out to the surface of the gel lotion together with the hydrocarbon oil.
  • the region of the top sheet 2 is provided with a high fiber density portion 8 having a fiber density higher than that of the peripheral portion in the recess 6 arranged along the longitudinal direction L, whereby the body fluid or the body fluid or , The surfactant bleeding out to the surface of the gel lotion easily diffuses from the non-skin surface side of the convex portion 7 of the top sheet 2 toward the high fiber density portion 8 in the top sheet 2 due to the capillary phenomenon.
  • the high fiber density portion 8 may be, for example, a bottom portion extending in the recess 6 along the longitudinal direction L, or a pressed portion (embossed portion) continuously or intermittently located in the recess 6.
  • the mechanism for increasing the diffusivity of body fluid during repeated absorption by arranging the gel lotion containing a surfactant on the non-skin surface side of the convex portion 7 of the top sheet 2 is as follows.
  • the absorbent article of the present invention is not limited to those that operate by the mechanism described below.
  • the gel lotion extended in the longitudinal direction L has the property of bleeding out the surfactant, and the bleed-out surfactant is topped due to gravity and the difference in fiber density in the top sheet 2.
  • the gel lotion can be automatically widely arranged in the top sheet by diffusing the inside of the sheet 2 toward the high fiber density portion in the width direction.
  • the hydrocarbon-based oil contained in the gel lotion bleeds out in the same manner as the surfactant and also functions as a body fluid slipper-imparting agent, so that the bleed-out hydrocarbon-based oil diffuses in the top sheet 2.
  • the permeability of the body fluid to the absorption layer 4 is also enhanced.
  • the additional surfactant and the hydrocarbon oil are discharged from the inside of the gel lotion. Since it bleeds out continuously, good body fluid absorption and body fluid permeability are maintained even during repeated absorption.
  • the gel lotion contains a styrene-based elastomer, a hydrocarbon-based oil, and a surfactant.
  • the top sheet 2 described later includes a gel lotion coating portion 5 coated with such a gel lotion, and the polarity of the hydrocarbon oil and the surfactant contained in the gel lotion. Because the surfactant easily bleeds out to the surface of the gel lotion, the action of the bleed-out surfactant enhances the diffusibility of the body liquid absorbed by the absorbent article 1.
  • this surfactant is supplied from the inside of the gel lotion to form the gel lotion. It bleeds out to the surface again, so that the fluid diffusivity is maintained.
  • the styrene-based elastomer preferably has a hard segment and a soft segment, a polystyrene block is preferable as the hard segment, and a polyolefin block is preferable as the soft segment.
  • Polystyrene blocks used as hard segments include not only blocks made of styrene homopolymers (ie, polystyrene blocks), but also blocks made of ⁇ -methylstyrene homopolymers (ie, poly- ⁇ -methylstyrene blocks), and styrene. Also included are blocks consisting of copolymers of and ⁇ -methylstyrene.
  • polyolefin block used as the soft segment examples include a block made of a homopolymer of polyolefin (polyethylene block, polypropylene block, polybutylene block, and polybutadiene block), and a block made of a copolymer of polyolefin (ethylene, propylene, butylene). And blocks made of copolymers such as butadiene). In this specification, butadiene is also treated as an olefin-based monomer for convenience. Further, the soft segment also includes a hydrogen adduct of a polybutadiene block and a hydrogen adduct of a block composed of butadiene and a copolymer of ethylene, propylene, butylene and butadiene.
  • the hard segment is arranged at both ends, and one or more kinds of soft segments are arranged between them. Is preferable.
  • styrene-based elastomer examples include the following.
  • SEP Polystyrene-block-poly (ethylene-co-propylene)
  • SEPS Polystyrene-block-poly (ethylene-co-propylene) -block-polystyrene
  • SEBS Polystyrene-block-poly (ethylene-co-butylene) -block-polystyrene
  • SEEPS Polystyrene-block-polyethylene-block-poly (ethylene-co-propylene) -block-polystyrene
  • SEEPS Polystyrene-block-polyethylene-block-poly (ethylene-co-propylene) -block-polystyrene
  • the styrene-based elastomer preferably has a weight average molecular weight of 5,000 or more and 500,000 or less, more preferably 10,000 or more and 400,000 or less, and further preferably 50,000 or more and 300,000 or less.
  • a weight average molecular weight 5,000 or more
  • the styrene-based elastomer can more easily retain the gel structure, and when the weight average molecular weight is 500,000 or less, the gel lotion does not become too hard and the gel. The handling of lotion is improved. The method for measuring the weight average molecular weight will be described later.
  • the polystyrene-based elastomer preferably contains a polystyrene block of 10% by mass or more and 50% by mass or less and a polyolefin block of 50% by mass or more and 90% by mass or less, and more preferably 15% by mass or more and 40.
  • the polystyrene block When the amount of the polystyrene block is 10% by mass or more, the polystyrene block can more easily form the microlayer separation structure described later. When the amount of the polystyrene block is 50% by mass or less, the amount of the polyolefin block that can hold the lotion is kept above a certain level, so that the amount of the hydrocarbon-based oil that can be held tends to be kept above a certain level. In addition, the amount of the polystyrene block microlayer-separated structure increases, the gel lotion formed becomes hard, and the wearing feeling tends to be inferior.
  • the hard segments of the styrene-based elastomer aggregate with each other to form a domain and act as a cross-linking point.
  • the soft segment acts as a network connecting these cross-linking points. Then, when the styrene-based elastomer is mixed with the hydrocarbon-based oil, the soft segment of the styrene-based elastomer retains the hydrocarbon-based oil, while the hard segment remains in the domain formation.
  • the mixture (gel lotion) of the styrene-based elastomer and the hydrocarbon-based oil becomes an elastic body capable of maintaining the shape as a gel to a certain extent.
  • the hydrocarbon-based oil is only retained in the loose mesh of the soft segment of the styrene-based elastomer, and can move to the surface of the gel lotion together with the surfactant described later.
  • the gel lotion in the embodiment of the present invention contains a hydrocarbon-based oil.
  • the "hydrocarbon-based oil” means a compound (hydrocarbon) composed of carbon and hydrogen, which has a constant fluidity at room temperature.
  • examples of the above-mentioned hydrocarbons include chain hydrocarbons, for example, paraffinic hydrocarbons (which do not contain double bonds and triple bonds, also referred to as alkenes) and olefin hydrocarbons (which contain one double bond and also include alkenes).
  • Acetylene-based hydrocarbons (containing one triple bond, also referred to as alkynes), and hydrocarbons containing two or more bonds selected from the group consisting of double and triple bonds, and cyclic hydrocarbons.
  • alkynes include hydrogen, for example, aromatic hydrocarbons and alicyclic hydrocarbons.
  • the hydrocarbon used as the hydrocarbon-based oil it is preferable to use a chain hydrocarbon and an alicyclic hydrocarbon, more preferably a chain hydrocarbon, and a paraffin-based hydrocarbon. It is more preferable to use hydrogen, olefin hydrocarbons, and hydrocarbons containing two or more double bonds (not including triple bonds), and most preferably paraffin hydrocarbons.
  • the chain hydrocarbons include linear hydrocarbons and branched chain hydrocarbons.
  • the hydrocarbon oil according to the embodiment of the present invention preferably has a kinematic viscosity at 40 ° C. of 0.01 mm 2 / s or more and 80 mm 2 / s or less, and preferably has a weight average molecular weight of less than 1,000. ..
  • a certain amount of hydrocarbon-based oil contained in the gel lotion is bleeded out to the surface of the gel lotion together with the surfactant. Then, when the hydrocarbon-based oil bleeding out on the surface of the gel lotion disappears by sliding into the absorption layer together with body fluids such as menstrual blood and urine, the hydrocarbon-based oil newly bleeds out from the gel lotion. This allows the gel lotion to continuously release hydrocarbon oils.
  • the above hydrocarbon-based oil is preferably 50% by mass or more and 100% by mass or less among the lotion components contained in the gel lotion. More preferably, it contains 60% by mass or more and 100% by mass or less, and more preferably 70% by mass or more and 100% by mass or less.
  • the gel lotion contains a surfactant.
  • the surfactant include cationic surfactants, anionic surfactants, nonionic surfactants and the like, but in the embodiment of the present invention, the gel lotion contains a nonionic surfactant. It is preferable to be.
  • the gel lotion contains a nonionic surfactant, the surfactant from the gel lotion becomes more persistent and sustained-release, and the gel lotion stimulates the skin. Sex is reduced.
  • Nonion-based surfactant is not particularly limited, but is an ether-based surfactant such as polyoxyalkylene alkyl ether and polyoxyalkylene alkyl aryl ether; polyglycerin fatty acid ester, sucrose fatty acid ester, and poly.
  • ester-based surfactants such as oxyalkylene fatty acid ester and polyoxyalkylene polyol fatty acid ester can be mentioned, in the embodiment of the present invention, it is preferable that the gel lotion contains an ester-based surfactant.
  • the surfactant preferably has an HLB value of 7 or more and 20 or less, and more preferably 10 or more and 18 or less.
  • the surfactant has an HLB value of 7 or more and 20 or less, the surfactant is more likely to bleed out from the gel lotion, and the body fluid diffusibility of the absorbent article during repeated absorption is enhanced.
  • the ether-based surfactant having an HLB of 7 or more and 20 or less include polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether and the like, and an ester having an HLB of 7 or more and 20 or less.
  • system surfactant examples include polyglycerin fatty acid SL, sucrose fatty acid ester, polyoxyethylene glycerin fatty acid ester (for example, polyoxyethylene glycerin monostearic acid ester, polyoxyethylene glycerin triisostearic acid ester, etc.), and polyoxyethylene sorbitan.
  • Fatty acid esters eg, polyoxyethylene sorbitan monolauric acid ester, polyoxyethylene sorbitan monooleic acid ester, polyoxyethylene sorbitan tetraoleic acid ester, polyoxyethylene sorbitan tetraoleic acid ester, polyoxyethylene sorbitan tetraoleic acid ester, poly Oxyethylene sorbitan tetraisostearic acid ester, etc.
  • polyethylene glycol fatty acid ester etc.
  • ester-based surfactant other than the above-mentioned ester-based surfactant use a ceramica (a surfactant having a glycolipid structure in which a fatty acid is ester-bonded to a hydroxyl group of mannosyl erythritol) manufactured by Toyobo Co., Ltd. You can also.
  • the ester-based surfactant has a fatty acid ester structure, the number of carbon atoms of the fatty acid is preferably 8 or more and 20 or less in order to realize the above 7 or more and 20 or less HLB, and 10 or more and 18 or less. It is more preferable that it is 12 or more and 16 or less.
  • the HLB value takes a value from 0 to 20, and the closer it is to 0, the higher the lipophilicity, and the closer it is to 20, the higher the hydrophilicity.
  • the gel lotion may further contain other lotion components used as lotion components in the production of gel lotions in the art.
  • kinematic viscosity is measured at a test temperature of 40 ° C. using a Canon Fenceke backflow viscometer according to “5. Kinematic viscosity test method” of JIS K 2283: 2000.
  • the weight average molecular weight means a polystyrene-equivalent value determined by gel filtration chromatography (GPC).
  • GPC gel filtration chromatography
  • Examples of the GPC measurement conditions include the following conditions. Model: Hitachi High-Technologies Corporation High Performance Liquid Chromatogram Lachrom Elite Column: Showa Denko Corporation SHODEX KF-801, KF-803 and KF-804 Eluent: THF Flow rate: 1.0 mL / min Drive: 100 ⁇ L Detection: RI (Differential Refractometer)
  • the gel lotion contains a surfactant, preferably 1% by mass or more and 20% by mass or less, more preferably 2% by mass or more and 15% by mass, from the viewpoint of improving the diffusibility of body fluid during repeated absorption. % Or less, more preferably 2% by mass or more and 10% by mass or less.
  • the gel lotion contains styrene-based elastomer and hydrocarbon-based oil, preferably 1 part by mass or more and 30 parts by mass or less and 70 parts by mass, respectively, based on a total of 100 parts by mass.
  • mass or more and 99 parts by mass or less more preferably 2 parts by mass or more and 20 parts by mass or less, 80 parts by mass or more and 98 parts by mass or less, further preferably 3 parts by mass or more and 15 parts by mass or less, and 85 parts by mass or more and 97 parts by mass or less. Include in proportion.
  • the gel lotion formed has sufficient elastic force, and even when body pressure is applied when wearing an absorbent article, the gel lotion The shape is easy to maintain.
  • the ratio of the styrene-based elastomer is 30 parts by mass or less, the elasticity of the formed gel lotion is suppressed from becoming too high, and a feeling of strangeness is less likely to occur when worn.
  • Most of the conventional lotion coating agents employ a method of increasing the viscosity (viscosity) of the active ingredients in order to fix them in a predetermined place.
  • viscosity viscosity
  • the active ingredient is trapped inside the lotion coating agent or the like, and it becomes difficult to exert its function.
  • most of the conventional lotion coating agents are only viscous substances, and when body pressure such as pressure is applied, they are not fixed in a predetermined place but move inside the absorbent article and act on the wearer's skin. There is a problem that is difficult to keep doing.
  • the gel lotion used in the present invention behaves as an elastic body within a range where body pressure or the like is applied. Therefore, even if a high body pressure is applied to the gel lotion, the gel lotion is only elastically deformed and is not pushed between the fibers of the top sheet, etc., and when the body pressure is low, the elasticity is restored and the gel lotion returns to the original position. Therefore, the hydrocarbon-based oils and surfactants contained in the gel lotion can perform their actions at desired positions.
  • the gel lotion used in the present invention may contain other components as long as the effects of the present invention are not impaired.
  • the other components include antioxidants such as BHT (2,6-di-t-butyl-p-cresol), BHA (butylylated hydroxyanisole), and propyl zeoliteate; stilbite, rhombite, and brilliance.
  • BHT 2,6-di-t-butyl-p-cresol
  • BHA butylylated hydroxyanisole
  • propyl zeoliteate stilbite, rhombite, and brilliance.
  • Natural zeolites such as boiled stone, natrolite, stilbite, and somosonite, and synthetic zeolite and the like can be mentioned.
  • the absorbent article of the present invention is a region of the top sheet and the fiber sheet selected from the sheets which may be arranged between the top sheet and the absorbent layer, which overlaps with the absorbent layer in the thickness direction.
  • the absorbent article 1 of the present embodiment is provided with the gel lotion application portion 5 on the non-skin side surface of the top sheet 2.
  • the gel lotion does not easily prevent the permeation of the body fluid in the top sheet 2, so that the absorbent article 1 can apply the body fluid from the entire surface of the top sheet 2. Easy to absorb. Therefore, the body fluid permeability of the top sheet 2, which is a characteristic of permeating body fluid, is well maintained.
  • the concave portions 6 and the convex portions 7 are provided alternately with respect to the width direction W and along the longitudinal direction L.
  • a convex portion is formed on the non-skin side surface of the concave portion 6, and a concave portion is formed on the non-skin side surface of the convex portion 7, and has a wavy cross-sectional shape.
  • the top of the convex portion (non-skin side surface at the bottom of the recess 6) formed on the non-skin side surface of the recess 6 is held in contact with the skin side surface of the absorption layer 4.
  • the top sheet 2 has a convex portion 7 and a concave portion 6 that form a wavy cross section.
  • the abundance of the gel lotion on the non-skin side surface of the concave portion is smaller than the abundance amount of the gel lotion on the non-skin side surface of the convex portion, but in the present embodiment, as will be described later. Since the gel lotion is mainly present on the non-skin side surface of the convex portion 7, the surfactant bleeding out from the gel lotion on the non-skin side surface of the convex portion 7 follows gravity along the width direction W. Therefore, the non-skin side surface of the top sheet 2 is easily diffused into the recess 6. As a result, the diffusivity of the body fluid in the longitudinal direction L is enhanced not only in the convex portion 7 but also in the concave portion 6.
  • the concave portions 6 and the convex portions 7 are arranged alternately with respect to the width direction W and are arranged along the longitudinal direction L.
  • a gel lotion application portion 5 is provided along the longitudinal direction L in the concave portion formed on the non-skin side surface of the convex portion 7.
  • the gel lotion contains a surfactant, but as described above, in the absorbent article 1 of the present embodiment, the body fluid is flowed along the longitudinal direction L by the action of the gel lotion at the convex portion 7.
  • the body fluid moved from the convex portion 7 is easily transmitted in the thickness direction T, but the concave portion 6 and the convex portion 7 are present along the longitudinal direction L, and the gel lotion. Since the coating portion 5 is also arranged along the longitudinal direction L, both the body fluid diffusibility of the absorbent article 1 during repeated absorption and the body fluid permeability of the top sheet 2 are enhanced. Further, since the gel lotion application portion 5 is provided in the concave portion formed on the non-skin side surface of the convex portion 7, the body fluid easily permeates from the concave portion 6 of the top sheet 2 toward the absorption layer 4. , The body fluid permeability of the top sheet 2 is increased.
  • the concave portions and the convex portions are not limited to the mode in which the concave portions and the convex portions are arranged alternately in the width direction W and along the longitudinal direction L, but are alternately arranged in the longitudinal direction L. It may be arranged along the width direction W.
  • the gel lotion application portion 5 is not limited to the embodiment provided only in the concave portion on the non-skin surface side of the convex portion 7, but is a region that overlaps with the absorption layer in the thickness direction.
  • the gel lotion is also present on the non-skin surface side of the concave portion, and the gel on the non-skin surface side of the concave portion is larger than the abundance of the gel lotion on the non-skin surface side of the convex portion.
  • the mode may be such that the abundance of lotion is reduced.
  • the gel lotion application portion is not limited to the mode provided on the non-skin side surface of the top sheet, and the skin side surface or the non-skin side surface of the sheet may be arranged between the top sheet and the absorption layer. It may be provided in.
  • the gel lotion tends not to permeate into the thickness direction T of the top sheet 2 and tends to exist on the surface of the concave portion on the non-skin surface side of the convex portion 7.
  • the gel lotion is not limited to the one provided continuously in the longitudinal direction, and may be provided intermittently along the longitudinal direction.
  • the concave portion and the convex portion can be formed by embossing or gear processing.
  • gear processing a plurality of ridges provided in parallel with each other and a concave groove between adjacent ridges are formed at regular intervals in the roll width direction along the outer peripheral surface.
  • a raw sheet is charged and stretched between a shaping device having a pair of upper and lower stretching rolls configured such that the ridges of one stretching roll mesh with the concave grooves of the other stretching roll. It is given by.
  • the distance between the vertices of the adjacent convex portions is, for example, 2.0 to 5.0 mm.
  • the height difference between the top of the convex portion and the bottom of the concave portion is, for example, 0.2 to 2 mm.
  • the region of the fiber sheet provided with the gel lotion coating portion has a high fiber density portion having a higher fiber density than the peripheral portion.
  • the high fiber density portion 8 having a higher fiber density than the convex portion 7 exists in the concave portion 6 of the top sheet 2 along the longitudinal direction L.
  • the high fiber density portion 8 is, for example, a portion pressed against the concave groove of the other drawing roll by the top of the ridge of one drawing roll in the raw sheet in the above-mentioned embossing or gear processing.
  • the body fluid and the surfactant bleeding out to the surface of the gel lotion are likely to diffuse into the high fiber density portion 8 due to the capillary phenomenon, the diffusivity of the body fluid in the longitudinal direction L is enhanced, and the recess 6 is caused by the capillary phenomenon. Since the body fluid that diffuses into the body fluid is easily absorbed by the high fiber density portion 8, the body fluid easily permeates the top sheet 2 toward the absorption layer 4. Therefore, the body fluid diffusibility of the absorbent article 1 during repeated absorption and the body fluid permeability of the top sheet 2 are enhanced.
  • an absorbent layer is arranged between the top sheet and the back sheet.
  • the type of the absorbent layer is not particularly limited, and may be an absorbent composed of a water-absorbent fiber such as fluff pulp and a highly absorbent polymer.
  • the highly absorbent polymer may be an absorbent sheet held between the non-woven fabrics.
  • the absorption layer 4 may have an absorption layer embossed pattern (not shown) formed on the surface of the absorption layer 4 along one or a plurality of directions intersecting the longitudinal direction L.
  • the absorption layer embossed pattern formed on the surface of the absorption layer 4 crosses the body fluid that has passed through the top sheet 2 and reached the surface of the absorption layer 4 with the longitudinal direction L1.
  • the body fluid diffusibility of the absorbent article 1 during repeated absorption is enhanced.
  • FIG. 4 is a plan view of the absorbent article 1'in the second embodiment of the present invention
  • FIG. 5 is a sectional view taken along line VV of FIG. 4
  • FIG. 6 is a second embodiment of the present invention. It is a perspective view of the top sheet 2'used for the absorbent article 1'in the embodiment.
  • the absorbent article 1'of this embodiment has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to each other.
  • FIG. 4 the absorbent article 1'of this embodiment has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to each other.
  • the plane pattern is different from the absorbent article 1 of the first embodiment of the present invention shown in FIGS. 1 to 3 in that it is a staggered pattern.
  • the absorbent article 1'of the present embodiment includes the gel lotion application portion 5'on the non-skin side surface of the top sheet 2', but as shown in FIG. 6, of the present embodiment.
  • the concave portions 6'and the convex portions 7' are arranged alternately with respect to the width direction W and the width direction W, that is, in a staggered pattern, and the concave portions are formed.
  • a convex portion is formed on the non-skin side surface of 6', and a concave portion is formed on the non-skin side surface of the convex portion 7', and has a wavy cross-sectional shape.
  • the concave portions 6'and the convex portions 7' are arranged in a staggered pattern.
  • a gel lotion application portion 5' is provided in the concave portion formed on the non-skin side surface of the convex portion 7'.
  • the gel lotion contains a surfactant, and as described in the first embodiment, the convex portion 7'and the convex portion 7'that easily diffuse the body fluid in the plane direction by the action of the gel lotion.
  • the concave portion and the convex portion can be formed by embossing or gear processing.
  • the distance between the vertices of the adjacent convex portions is, for example, 2.0 to 5.0 mm.
  • the height difference between the top of the convex portion and the bottom of the concave portion is, for example, 0.2 to 2 mm.
  • the region of the fiber sheet provided with the gel lotion coating portion has a high fiber density portion having a higher fiber density than the peripheral portion.
  • the high fiber density portion 8' which has a higher fiber density than the convex portion 7', exists in the concave portion 6'of the top sheet 2'.
  • the high fiber density portion 8' is pressed against the concave groove of the staggered pattern of the other stretched roll by the top of the staggered pattern of the staggered pattern of the other stretched roll in the raw sheet, for example, in the above embossing or gear machining. It is the part that was made.
  • the body fluid in which the recess 6'diffuses is easily absorbed by the capillary phenomenon, so that the body fluid easily permeates the top sheet 2'toward the absorption layer 4. Therefore, the diffusivity of the absorbent article 1'in the plane direction during repeated absorption and the permeability of the top sheet 2'are enhanced.
  • FIG. 7 is a cross-sectional view of the absorbent article 1 "in the third embodiment of the present invention corresponding to FIG. 2 of the first embodiment.
  • the absorbent article 1" of the present embodiment is a top sheet 2.
  • an absorption layer 4 arranged between the back sheet 3 and the top sheet 2 "and the back sheet 3, and a second sheet 9 is arranged between the top sheet 2" and the absorption layer 4.
  • the top sheet 2 is not provided with the concave portion and the convex portion
  • the second sheet 9 is provided with the concave portion and the convex portion
  • the convex portion of the second sheet 9 is provided on the non-skin side surface.
  • the gel lotion application portion 5 is provided.
  • the concave portions and convex portions arranged on the second sheet 9 are assumed to be concave portions and convex portions arranged along the longitudinal direction L alternately with respect to the width direction W.
  • the concave portion and the convex portion provided in the absorbent article are not limited to such an embodiment, and the concave portion and the convex portion may be arranged alternately along the width direction W with respect to the longitudinal direction L. , W may be arranged alternately with respect to the width direction W, that is, in a staggered pattern.
  • the body fluid permeability of the top sheet 2 is further enhanced, and the body fluid diffusivity during repeated absorption is improved by the second sheet 9. Further, since the gel lotion application portion is provided on the non-skin side surface of the convex portion, it is difficult to prevent the permeation of the body fluid in the second sheet 9, so that the body fluid stays in a part of the second sheet 9.
  • the absorbent article 1 "easily absorbs the body fluid from the entire surface of the top sheet 2" located on the upper layer of the second sheet 9. Therefore, the body fluid diffusivity during repeated absorption of the absorbent article 1 " The body fluid permeability of the top sheet 2 "is maintained well.
  • One aspect (aspect 11) of the present invention is an absorbent article including an absorber and a cloth sheet containing fibers arranged on the skin side of the absorbent body, wherein the cloth sheet is styrene.
  • a gel lotion containing a styrene elastomer, a hydrocarbon, and a surfactant is contained, and at least a part of the gel lotion is arranged as a plurality of thin film portions extending along a plurality of fiber portions constituting the fiber.
  • the absorbent article characterized in that it is made of.
  • the gel lotion is arranged as a predetermined thin film portion.
  • the hydrocarbons constituting the gel lotion impart a lotion function to the wearer's skin
  • the surfactant constituting the gel lotion contributes to thinning the gel lotion and makes the gel lotion hydrophilic. It is something that becomes.
  • the hydrophilized gel lotion has an affinity with a liquid such as a body fluid, and the liquid easily comes into contact with the thin film portion made of the gel lotion, and a part of the surfactant is added to the liquid in contact with the thin film portion. It dissolves and exerts a liquid transfer function that facilitates the transfer of liquid to the absorber.
  • the thin film portion made of gel lotion exerts a liquid return suppressing function of suppressing the liquid of the absorber from returning to the wearer side.
  • This liquid return suppressing function tends to increase as the absorbent article repeatedly absorbs the liquid, so that the surfactant in the thin film portion moves to the liquid and the thin film portion becomes hydrophobic.
  • the absorbent article of this embodiment can impart a lotion function to the wearer's skin by the thin film portion made of a gel lotion, and can exhibit a liquid transfer function and a liquid return suppressing function.
  • each of the plurality of thin film portions extends along the plane direction of the cloth sheet.
  • each of the plurality of thin film portions extends along the plane direction of the fabric sheet, the lotion function and the liquid return suppressing function by the gel lotion can be efficiently exhibited.
  • each of the plurality of thin film portions has the same thickness as the fiber or thinner than the fiber.
  • each of the plurality of thin film portions has a predetermined thickness, the lotion function, the liquid transfer function, and the liquid return suppressing function by the gel lotion can be efficiently exhibited.
  • the fabric sheet is a first fiber portion and a second fiber portion constituting the plurality of fiber portions. There are those that intersect each other at their intersections, and at least a part of the plurality of thin film portions is arranged over the first fiber portion, the intersection, and the second fiber portion.
  • At least a part of the plurality of thin film portions is arranged with the fiber portion in the above-mentioned predetermined relationship, so that the liquid return suppressing function can be more exhibited.
  • At least a part of the plurality of thin film portions has a length a in contact with the first fiber portion and the second fiber portion.
  • the following equations (1) and (2) 0.5a ⁇ c ... (1) 0.5b ⁇ c ... (2) Has a relationship of.
  • At least a part of the plurality of thin film portions is arranged with the fiber portion in the above-mentioned predetermined relationship, so that the liquid return suppressing function can be more exhibited.
  • any of the absorbent articles of aspects 11 to 15 in any of the absorbent articles of aspects 11 to 15, the entire peripheral edge of at least a part of the plurality of thin film portions is on the plurality of fiber portions. Is located in.
  • the absorbent article of this embodiment is arranged in at least a part of the plurality of thin film portions in the above-mentioned predetermined relationship with the fiber portion, it can more exert the liquid return suppressing function.
  • the absorbent article in any of the absorbent articles of aspects 11-16, comprises a liquid permeable sheet having skin and non-skin sides and the fabric.
  • the sheet constitutes the liquid permeable sheet.
  • the lotion function by the gel lotion can be more exhibited.
  • the liquid transfer function is rapidly functioned with respect to the absorbent article, that is, the liquid that has reached the liquid permeable sheet. be able to.
  • the cloth sheet since the cloth sheet constitutes the liquid permeable sheet, the return of the liquid can be suppressed at a position closer to the wearer, so that the liquid return suppressing function is more exhibited. be able to.
  • the amount of gel lotion placed on the non-skin side surface is greater than the amount of gel lotion placed on the skin side surface. ..
  • the amount of gel lotion placed on the non-skin side surface is larger than the amount of gel lotion placed on the skin side surface, so that the liquid that reaches the liquid permeable sheet is liquid by the gel lotion. It is less likely to prevent penetration into the permeable sheet, and the liquid transfer function can be more exerted. Further, in the absorbent article of this embodiment, the gel lotion placed on the non-skin side surface can exert a liquid return suppressing function at a position farther than the wearer, so that excessive body pressure is applied and absorbed. Even if the liquid absorbed by the body returns to the wearer's side, it becomes difficult for the wearer to come into contact with the returned liquid.
  • the liquid permeable sheet in the absorbent article of aspect 17 or 18, comprises a plurality of convex portions and a plurality of concave portions, and the plurality of thin films. At least a part of the portion is arranged in each of the plurality of convex portions.
  • the convex portion that first contacts the liquid that has reached the liquid permeable sheet rapidly exerts the above-mentioned liquid transfer function. can do. Further, since the thin film portion arranged on the convex portion can suppress the return of the liquid at a position closer to the wearer, the liquid return suppressing function can be more exerted.
  • the amount of the gel lotion placed in each of the plurality of protrusions was placed in each of the plurality of recesses. More than the amount of gel lotion.
  • the amount of gel lotion placed in the convex portion is larger than the amount of gel lotion placed in the concave portion, so that in the convex portion that first contacts the liquid that has reached the liquid permeable sheet.
  • the surfactant present in the thin film portion is dissolved in the liquid to rapidly transfer the liquid to the concave portion, and the liquid transferred from the convex portion to the concave portion quickly passes through the concave portion having a small amount of gel lotion. It can be transferred to an absorber, and the above-mentioned liquid transfer function can be more exerted.
  • the thin film portions that are often arranged on the convex portions can suppress the return of the liquid at a position closer to the wearer, the liquid return suppressing function can be more exerted.
  • the fiber density of each of the plurality of recesses is higher than the fiber density of each of the plurality of protrusions.
  • the liquid having the concave portion in the convex portion can be easily drawn in, and the liquid transfer function can be more exhibited. Further, since the liquid returned from the absorber is more likely to be present in the concave portion than in the convex portion, the liquid return suppressing function can be more exerted.
  • each of the plurality of convex portions and each of the plurality of concave portions alternate in a predetermined direction. Is located in.
  • the convex portions and the concave portions are alternately arranged in a predetermined direction, the above-mentioned liquid transfer function and liquid return suppressing function can be more easily exhibited.
  • the plurality of protrusions and the plurality of recesses extend in the first direction, respectively, and They are arranged alternately in a second direction that intersects the first direction.
  • the convex portions and the concave portions are alternately arranged in a predetermined direction, the above-mentioned liquid transfer function and liquid return suppressing function can be more easily exhibited.
  • the various directions and the like used in the present specification are as follows.
  • the "longitudinal direction” refers to the "long direction of a vertically long object (for example, an absorbent article) in a plan view”
  • the "width direction” refers to a “vertically long object in a plan view”.
  • Short length direction refers to "vertical direction to an object placed on a horizontal plane in an unfolded state”
  • these longitudinal, width, and thickness directions are orthogonal to each other.
  • the "planar direction” refers to "the direction in which the plane of a substantially sheet-like object (for example, a cloth sheet) extends in a plan view", and the plane direction and the thickness direction are mutually exclusive. There is an orthogonal relationship.
  • the longitudinal direction of a vertically long object the longitudinal side is relatively proximal to the central axis CW located in the center of the longitudinal object and extending in the width direction. It is referred to as “inward side in the direction”, and "in the longitudinal direction of the vertically long object, the distal side relative to the central axis C W " is referred to as "outward side in the longitudinal direction”.
  • the absorbent article of the present invention is an absorbent article including an absorbent body and a cloth sheet containing fibers arranged on the skin side of the absorbent body, and the cloth sheet is carbonized with a styrene-based elastomer. It contains a gel lotion containing hydrogen and a surfactant, and at least a part of the gel lotion is arranged as a plurality of thin film portions extending along a plurality of fiber portions constituting the fiber. ..
  • the hydrocarbons constituting the gel lotion impart a lotion function to the skin of the wearer, and the surfactant constituting the gel lotion contributes to thinning the gel lotion, and the gel lotion.
  • the gel lotion hydrolyzed by this surfactant has an affinity with a liquid such as a body fluid, and the liquid easily comes into contact with the thin film portion made of the gel lotion, and also has an interface with the liquid in contact with the thin film portion. It is possible to exert a liquid transfer function that facilitates the transfer of the liquid to the absorber by partially dissolving the activator.
  • the thin film portion made of gel lotion can exert a liquid return suppressing function of suppressing the liquid of the absorber from returning to the wearer side.
  • the absorbent article of the present invention can impart a lotion function to the wearer's skin by a thin film portion made of a gel lotion, and can also exhibit a liquid transfer function and a liquid return suppressing function.
  • the fabric sheet is not particularly limited as long as it is arranged on the skin side of the absorbent body, and for example, the liquid permeability of a top sheet or a second sheet used in a general absorbent article is used.
  • the sheet can be mentioned.
  • the type of fabric is not particularly limited, and examples thereof include non-woven fabrics, woven fabrics, and knitted fabrics.
  • the type of the absorbent article to which the present invention is applied is not particularly limited, and is applied to various absorbent articles such as panty liners, (light) incontinence pads, disposable diapers, etc., in addition to the sanitary napkins of the embodiments described later. can do.
  • the sanitary napkin 10 which is an example of the “absorbent article” of the present invention has a longitudinal direction L and a width direction W in a plan view, and both ends of the longitudinal direction L are further formed. It has a vertically long outer shape that protrudes in an arc toward the outside in the longitudinal direction L, and further, both ends of the sanitary napkin 10 in the width direction W are located at substantially the center of the longitudinal direction L. Each has a pair of flap portions extending in a substantially trapezoidal shape toward the outer side in the width direction W.
  • the sanitary napkin 10 as shown in FIG. 9, in the thickness direction T, with specific uneven structure having a convex portion 210 and concave portion 220 will be described later is located relatively skin side T 1 and non-woven fabric a liquid-permeable sheet 20 consisting of; relative to the liquid impervious sheet 30 made of a hydrophobic nonwoven fabric or a resin film located on the non-skin side T 2; absorbent and liquid retaining located between these two sheets
  • the absorbent body 40 having a property and; are provided as the main constituent members.
  • the sanitary napkin 10 is a pair of side sheets 50, 50 located at both ends in the width direction W on the skin side T 1 of the liquid permeable sheet 20; and a non-skin side T 2 of the liquid permeable sheet 30.
  • An adhesive portion for fixing clothes (not shown) arranged on the surface and; are further provided as constituent members.
  • the liquid permeable sheet 20 contains a gel lotion 60 containing a styrene-based elastomer, a hydrocarbon, and a surfactant. Further, at least a part of the gel lotion 60 is arranged as a plurality of thin film portions 610 extending along the plurality of fiber portions of the constituent fibers 2F of the liquid permeable sheet 20. That is, in the present embodiment, the above-mentioned cloth sheet constitutes the liquid permeable sheet 20.
  • the lotion function of the gel lotion 60 can be more effectively exerted, and the body fluid or the like supplied to the liquid permeable sheet 20 can be exerted more effectively.
  • the liquid transfer function can be made to function quickly with respect to the liquid of. Further, in the present embodiment, the return of the liquid transferred to the absorber 40 can be suppressed at a position closer to the wearer by the thin film portion 610 of the gel lotion 60 in the liquid permeable sheet 20, so that the liquid return is suppressed. The function can be exhibited more effectively.
  • the liquid permeable sheet 20 comes into direct contact with the wearer's skin except for a portion overlapping the pair of side sheets 50, 50 in the thickness direction T. It is arranged at a possible position and is composed of a liquid-permeable sheet-like member through which body fluids such as menstrual blood discharged from the wearer can permeate.
  • the outer shape and size of the liquid permeable sheet shall be any outer shape and size according to various uses, etc., as long as the surface of the absorber on the skin side is not exposed. Can be done.
  • the sheet-like member that can be used as a liquid-permeable sheet is provided as long as it has various properties (for example, liquid permeability, touch, flexibility, strength, etc.) that can be used as a liquid-permeable sheet of an absorbent article.
  • properties for example, liquid permeability, touch, flexibility, strength, etc.
  • non-woven fabrics such as air-through non-woven fabrics, spunbonded non-woven fabrics, and point-bonded non-woven fabrics can be preferably used.
  • the non-woven fabric may be hydrophilized.
  • constituent fibers of the non-woven fabric are not particularly limited, and for example, hydrophilic fibers such as cellulose fibers and thermoplastic resin fibers subjected to hydrophilic treatment (for example, olefin resins and polyester resins subjected to hydrophilic treatment) are hydrophilic. Fiber can be mentioned. These fibers may be used alone or in combination of two or more kinds of fibers.
  • the basis weight and thickness of the non-woven fabric are not particularly limited, and examples thereof include a basis weight of 25 g / m 2 to 50 g / m 2 and a thickness of 0.5 mm to 3.0 mm.
  • the basis weight of the non-woven fabric can be measured according to 5.2 of JIS L 1906, and the thickness of the non-woven fabric can be measured by a laser displacement meter (for example, high-precision two-dimensional laser displacement meter LJ-G series manufactured by Keyence Co., Ltd.). (Model: LJ-G030)) can be used for non-contact measurement.
  • the thickness of the non-woven fabric is measured at five different measurement target portions, and the average value thereof is adopted.
  • the recesses 220 have a concavo-convex structure that is alternately arranged along a second direction (in this embodiment, a direction corresponding to the width direction W of the sanitary napkin 10) that intersects the first direction. ing.
  • the body fluid supplied on the liquid permeable sheet 20 is directed in the first direction along the above-mentioned recess 220 (that is, the length of the sanitary napkin 10). while diffusing in the direction L), it can be impregnated into the non-skin side T 2 of the liquid-permeable sheet 20.
  • the gel lotion 60 is arranged along the longitudinal direction L of the sanitary napkin 10 at the convex portion 210, the body fluid is caused to flow along the longitudinal direction L by the action of the gel lotion 60. It is easy to diffuse, and further, in the concave portion 220, the body fluid moved from the convex portion 210 is easily permeated in the thickness direction T.
  • the first direction in which the convex portion and the concave portion of the liquid permeable sheet extend is not limited to the embodiment of the above-described embodiment (that is, the direction corresponding to the longitudinal direction of the absorbent article) and is absorbent. Any direction such as a direction corresponding to the width direction of the article can be adopted.
  • the convex portion and the concave portion are arranged on the entire liquid permeable sheet, but the present invention is not limited to such an arrangement form, and the convex portion and the concave portion are the liquid permeable sheet. It may be arranged only in a predetermined portion of. In this case, the protrusions and recesses are preferably arranged at least in a region overlapping the absorber in the thickness direction.
  • the convex portion and the concave portion of the liquid permeable sheet can be partitioned as follows. That is, when the liquid permeable sheet is placed on the horizontal plane with the non-skin side surface facing downward, the portion having the highest height from the horizontal plane is the top of the convex portion, and the height from the horizontal plane is set. The lowest part is the bottom of the recess, and the thickness d of the entire liquid permeable sheet is bisected (that is, the distance from the top and bottom in the thickness direction is d / 2).
  • the portion protruding upward from the reference horizontal plane is the "convex portion”
  • the portion recessed downward is the "concave portion”.
  • these convex portions and concave portions can be discriminated from the photograph or image by magnifying and observing the cross section of the liquid permeable sheet along the second direction by a magnifying observation means such as a scanning electron microscope.
  • the liquid permeable sheet 20 has a recess and a recess in which the surface of the non-skin side T 2 corresponds to the convex portion 210 and the concave portion 220 of the skin side T 1. It has a concave-convex structure with convex portions, and has a structure in which the internal structure of the convex portions 210 is hollow.
  • the surface structure on the non-skin side of the liquid permeable sheet is not limited to such a structure, for example, a flat structure without unevenness (that is, the internal structure of the convex portion is solid).
  • the surface structure on the non-skin side of the liquid permeable sheet is the above-described embodiment.
  • a concave-convex structure having concave portions and convex portions corresponding to the convex portions and the concave portions on the skin side (that is, a structure in which the internal structure of the convex portions is hollow).
  • the liquid permeable sheet 20 has a high-density portion (not shown) in the concave portion 220 having a fiber density relatively higher than that of the convex portion 210.
  • the liquid permeable sheet has such a high-density portion in the recess, the body fluid supplied to the liquid permeable sheet is easily drawn into the high-density portion by the capillary phenomenon, so that the body fluid is transferred to the absorber. It can be made easier.
  • the magnitude of the density (fiber density) in each portion (convex portion, concave portion, etc.) of the liquid permeable sheet is determined by determining each of the target portions (for example, a size of 1 mm ⁇ 1 mm) for which the magnitude of the density is compared. It can be visually judged from the number of fibers per unit area by magnifying observation at a magnification of about 20 to 100 times by a magnifying observation means such as a scanning electron microscope.
  • the specific structure of the convex portion and the concave portion of the liquid permeable sheet is not particularly limited, and for example, the height of the convex portion (that is, the distance in the thickness direction from the above virtual reference horizontal plane to the top) is 0.1 mm or more. It is within the range of 3.0 mm, the depth of the recess (that is, the distance in the thickness direction from the above virtual reference horizontal plane to the bottom) is within the range of 0.1 mm to 3.0 mm, and further, a plurality of protrusions.
  • the pitch of the portions is in the range of 1.0 mm to 10.0 mm.
  • the width of the convex portion (that is, the length of the portion having the maximum length in the second direction of the convex portion in the second direction) is, for example, in the range of 0.5 mm to 5.0 mm
  • the concave portion (That is, the length of the portion having the maximum length in the second direction of the recess in the second direction) is, for example, in the range of 0.5 mm to 5.0 mm.
  • the width of the convex portion and the width of the concave portion may be the same or different in each of the convex portion and the concave portion.
  • the pitch and width of the convex portion and the concave portion can be measured from a plane image or a cross-sectional image of the non-pressurized non-woven fabric by magnifying and observing it with a magnifying observation means such as a scanning electron microscope. Further, the height, depth, thickness, etc. of the convex portion and the concave portion may be magnified and measured by a magnifying observation means such as a scanning electron microscope in the same manner as the pitch and width described above, but a laser displacement meter is used. It may be measured by a non-contact method.
  • the method of forming the above-mentioned uneven structure on the liquid permeable sheet is not particularly limited, and for example, a gas (for example, air or the like) is continuously applied to one surface of the fiber web before forming the non-woven fabric.
  • a gas for example, air or the like
  • Any shaping method such as a gas blowing method for spraying a gas, a gear processing method using a pair of shaping rolls arranged one above the other, an embossing method, a method using vacuum forming or compression forming can be adopted. ..
  • the gas spraying method, the gear processing method, and the embossing method are preferable because it is easy to form a high-density portion having a high fiber density in the concave portion while shaping the uneven structure.
  • the liquid-permeable sheet is joined to the skin side surface of the liquid-impermeable sheet regardless of whether it is joined to the non-skin side surface of the pair of side sheets, or to the skin side surface or the non-skin side surface of the absorber. Or may be joined to any of them.
  • the joining method is not particularly limited, and any joining means such as a hot melt type adhesive or heat fusion can be adopted.
  • the liquid permeable sheet 20 contains a gel lotion 60 containing a styrene-based elastomer, a hydrocarbon, and a surfactant, and further, the gel lotion 60. As shown in FIG. 10, at least a part thereof is arranged so as to form a plurality of thin film portions 610 extending along the plurality of fiber portions constituting the constituent fibers 2F of the liquid permeable sheet 20.
  • the styrene-based elastomer, a hydrocarbon, gel lotion 60 containing a surfactant is disposed on the liquid-permeable sheet 20 located on the skin side T 1 than the absorbent body 40, at least a part
  • the liquid permeable sheet 20 is provided with the above-mentioned lotion function, liquid transfer function and liquid return suppressing function. It is to be given.
  • the gel lotion 60 permeates the inside from the surface of the liquid permeable sheet 20 (the non-skin side surface in the present embodiment), and in the permeated portion, the figure is shown between the plurality of constituent fibers of the liquid permeable sheet 20.
  • a thin film portion 610 made of a gel lotion 60 as shown in No. 11 is formed.
  • the surfactant contained in the gel lotion 60 acts on the hydrocarbon and arranges it on the surface thereof, so that the surface tension of the hydrocarbon is lowered and the viscosity is increased, so that the gel lotion 60 is liquid permeable. It is easy to form the thin film portion 610 between the constituent fibers of the sheet 20.
  • a plurality of thin film portions 610 are formed on the liquid permeable sheet 20, and the form thereof varies depending on the number and arrangement of constituent fibers involved in the formation of the thin film portion 610, the distance between fibers, and the like.
  • a part of the thin film portion 610 of the plurality of thin film portions 610 has the entire peripheral edge portion arranged on the plurality of fiber portions, and is different.
  • a part of the peripheral portion of the thin film portion 610 of the above is arranged on a plurality of fiber portions.
  • the entire peripheral edge portion of the thin film portion is arranged on the plurality of fiber portions, so that the above-mentioned liquid return suppressing function can be more effectively performed. Can be demonstrated.
  • the liquid permeable sheet (fabric sheet) is formed by the first fiber portion 2F 1 and the second fiber portion 2F 2 constituting the plurality of fiber portions of the constituent fibers. There are those that intersect each other at their intersection CP, and at least a part of the plurality of thin film portions 610 is arranged over the first fiber portion 2F 1 , the intersection CP and the second fiber portion 2F 2.
  • the length a in contact with the first fiber portion 2F 1, the length b in contact with the second fiber portion 2F 2, the first fiber portion 2F 1 and a second fiber portion 2F 2 virtual two between the length c in contact with the bisector L F, it is preferable to have a relationship of the following equation (1) and (2).
  • 0.5a ⁇ c ... (1) 0.5b ⁇ c ... (2) When at least a part of the plurality of thin film portions 610 is arranged with such a predetermined relationship with the fiber portion, the above-mentioned liquid return suppressing function can be more effectively exhibited.
  • each of the plurality of thin film portions has the same thickness as or thinner than the constituent fibers of the liquid permeable sheet (fabric sheet).
  • the lotion function, the liquid transfer function, and the liquid return suppressing function of the gel lotion can be efficiently exhibited.
  • the gel lotion 60 is arranged on the non-skin side surface of the liquid permeable sheet 20 and permeates in the thickness direction T, and the liquid permeable sheet 20
  • the amount of gel lotion placed on the non-skin side is greater than the amount of gel lotion placed on the side of the skin.
  • the gel lotion may be arranged on either the skin side surface or the non-skin side surface of the liquid permeable sheet (fabric sheet), but as in the above embodiment, the liquid If the amount of gel lotion placed on the non-skin side of the permeable sheet is greater than the amount of gel lotion placed on the side of the skin, the gel lotion causes the body fluid that has reached the liquid permeable sheet to enter the liquid permeable sheet.
  • the gel lotion placed on the non-skin side of the liquid permeable sheet is located farther than the wearer, and the above-mentioned liquid transfer function can be more reliably exerted without hindering the penetration into the above-mentioned liquid. Since it can exert a liquid return suppressing function, even if excessive body pressure is applied and the liquid absorbed by the absorber returns to the wearer side, it makes it difficult for the returned body liquid to come into contact with the wearer. be able to.
  • the liquid permeable sheet 20 includes a plurality of convex portions 210 and a plurality of concave portions 220, and at least one of the plurality of thin film portions 610.
  • the portions are arranged on each of the plurality of convex portions 210.
  • the thin film portion 610 made of the gel lotion 60 is arranged on the convex portion 210 of the liquid permeable sheet 20
  • the convex portion 210 that first comes into contact with the body fluid that has reached the liquid permeable sheet 20 is the above-mentioned liquid.
  • the migration function can be demonstrated quickly. Further, since the thin film portion 610 arranged on the convex portion 210 can suppress the return of the body fluid at a position closer to the wearer, the above-mentioned liquid return suppressing function can be more effectively exhibited.
  • the gel lotion 60 is arranged on each of the plurality of convex portions 210 in the liquid permeable sheet 20, and the gel lotion 60 is arranged on each of the plurality of convex portions 210.
  • the amount of gel lotion 60 placed is greater than the amount of gel lotion 60 placed in each of the plurality of recesses 220.
  • the gel lotion may be arranged on any of a plurality of convex portions and concave portions of the liquid permeable sheet (fabric sheet), but as in the above-described embodiment, the plurality of convex portions If the amount of gel lotion placed in each of the portions is greater than the amount of gel lotion placed in each of the plurality of recesses, then in the convex portion that first contacts the body fluid that has reached the fluid permeable sheet, The surfactant present in the thin film portion can be dissolved in the body fluid to rapidly transfer the body fluid to the concave portion, and the body fluid transferred from the convex portion to the concave portion quickly passes through the concave portion having a small amount of gel lotion.
  • the above-mentioned liquid transfer function can be more reliably exerted.
  • the thin film portions arranged in large numbers on the convex portions can suppress the return of body fluid at a position closer to the wearer, the above-mentioned liquid return suppressing function can be more effectively exhibited.
  • the fiber density of each of the plurality of recesses 220 is higher than the fiber density of each of the plurality of convex portions 210, and the liquid permeable sheet 20 is formed in each of the plurality of recesses 220.
  • the above-mentioned high-density portion is formed.
  • the concave portion 220 easily draws in the liquid existing in the convex portion 210 due to the capillary phenomenon, and the above-mentioned liquid transfer function is more reliably exhibited. can do.
  • the body fluid returned from the absorber 40 is more likely to be present in the concave portion 220 than in the convex portion 210, the above-mentioned liquid return suppressing function can be more effectively exhibited.
  • each of the plurality of convex portions 210 and each of the plurality of concave portions 220 are alternately arranged in a predetermined direction (that is, a second direction). Therefore, it becomes easier to exert the above-mentioned liquid transfer function and liquid return suppression function. Further, since the plurality of convex portions 210 and the plurality of concave portions 220 each extend in the first direction (the direction corresponding to the longitudinal direction L of the sanitary napkin 10), the body fluid supplied to the liquid permeable sheet 20. Is easy to diffuse in the first direction, and in particular, the diffusibility of the body fluid repeatedly supplied is excellent, and the above-mentioned liquid transfer function and liquid return suppression function are more easily exhibited.
  • the arrangement form of the plurality of thin film portions made of gel lotion is not particularly limited, but the plurality of thin film portions may extend along the plane direction of the liquid permeable sheet (fabric sheet). preferable.
  • the lotion function and the liquid return suppressing function by the gel lotion can be efficiently exhibited.
  • styrene-based elastomer examples include those having a hard segment and a soft segment.
  • examples of the hard segment include a styrene-based hard segment
  • examples of the soft segment include an olefin-based soft segment.
  • examples of the styrene-based hard segment include polystyrene, poly- ⁇ -methylstyrene, and a copolymer of styrene and ⁇ -methylstyrene.
  • examples of the olefin-based soft segment include homopolymers of polyolefins (for example, polyethylene, polypropylene, polybutylene, polybutadiene, etc.), copolymers of polyolefins, and hydrogen adducts thereof.
  • the arrangement form of the hard segment and the soft segment in the styrene-based elastomer is not particularly limited, but the above-mentioned hard segment may be arranged at both ends of the molecular chain consisting of one or a plurality of types of soft segments. preferable.
  • the styrene-based elastomer functions as an elastic body because a network-like network structure is formed by a plurality of agglomerated domains formed by the interaction of hard segments and soft segments connecting the plurality of agglomerated domains. Can be maintained in a gel state even under temperature conditions near body temperature (about 35 ° C. to about 40 ° C.).
  • a network structure also has a function of retaining hydrocarbons and surfactants so as to be released.
  • styrene-based elastomers include, for example, styrene-ethylene-propylene block copolymer (SEP), styrene-ethylene-propylene-styrene block copolymer (SEPS), and styrene-ethylene-butylene-styrene block common weight.
  • SEP styrene-ethylene-propylene block copolymer
  • SEPS styrene-ethylene-propylene-styrene block copolymer
  • SEEPS coalescence
  • SEEPS coalescence-styrene-ethylene-ethylene-propylene-styrene block copolymer
  • the weight average molecular weight of the styrene-based elastomer is not particularly limited, but is preferably 5,000 to 500,000, more preferably 10,000 or more than 400,000, more preferably 50,000 300, It is 000 or less.
  • the weight average molecular weight is 5,000 or more, the styrene-based elastomer easily retains the gel structure, and when the weight average molecular weight is 500,000 or less, the gel lotion does not become too hard and when the absorbent article is worn. , It can be less likely to cause discomfort or discomfort to the wearer.
  • the weight average molecular weight can be determined by gel permeation chromatography (GPC) measurement under the following conditions using tetrahydrofuran (THF) as a mobile phase and by polystyrene conversion.
  • GPC measurement conditions Model: Hitachi High-Technologies Corporation High Performance Liquid Chromatogram Lachrom Elite Column: Showa Denko SHODEX KF-804 Solvent: THF Flow rate: 1.0 mL / min Drive: 100 ⁇ L Detection: RI (Differential Refractometer)
  • the styrene-based elastomer preferably contains a styrene-based block component of 10% by mass or more and 50% by mass or less and an olefin-based block component of 50% by mass or more and 90% by mass or less, and more preferably 15% by mass or more and 40% by mass.
  • % Or less olefin-based block component is preferably contains a styrene-based block component of 10% by mass or more and 50% by mass or less and an olefin-based block component of 50% by mass or more and 90% by mass or less, and more preferably 15% by mass or more and 40% by mass.
  • the amount of the styrene-based block component is 10% by mass or more, the amount of the hard segment (that is, the styrene-based block component) forming the above-mentioned agglutination domain can be secured to a certain level or more, so that the styrene-based elastomer has a network structure like a network. Is easy to form.
  • the amount of the styrene-based block component is 50% by mass or less, the amount of the olefin-based block component that retains the hydrocarbon or the like can be secured to a certain level or more, so that the amount of the hydrocarbon or the like that can be retained can be increased.
  • the amount of agglomerated domains formed by the hard segment can be limited to a certain level or less, the gel after being applied to the liquid permeable sheet (fabric sheet) does not become too hard, and the absorbent article When worn, it is possible to make it less likely to cause discomfort or discomfort to the wearer.
  • the amount of the styrene-based elastomer contained in the gel lotion is not particularly limited, but is preferably 1 part by mass or more and 30 parts by mass or less with respect to 100 parts by mass in total of the styrene-based elastomer and the hydrocarbon, and more preferably. It is 2 parts by mass or more and 20 parts by mass or less, and more preferably 3 parts by mass or more and 15 parts by mass or less.
  • the blending amount of the styrene-based elastomer is 1 part by mass or more, the gel lotion has sufficient elasticity, so that the shape of the gel lotion can be easily maintained even when body pressure is applied when wearing an absorbent article. .. Further, when the blending amount of the styrene-based elastomer is 30 parts by mass or less, the elasticity of the gel lotion does not become too high, and it is possible to prevent the wearer from causing discomfort or discomfort.
  • hydrocarbon used in the gel lotion has a certain fluidity at room temperature, and when it comes into contact with the skin of the wearer of the absorbent article, it imparts a lotion function to the skin of the wearer.
  • Such hydrocarbons are not particularly limited and may have a linear, branched or cyclic structure and may have a saturated or unsaturated bond. Examples of such hydrocarbons are olefinic hydrocarbons (alkenes containing one double bond), paraffinic hydrocarbons (alkenes containing neither double or triple bonds), acetylene hydrocarbons (triple bonds). Chain hydrocarbons such as alkynes containing one), hydrocarbons containing two or more double and / or triple bonds; cyclic hydrocarbons such as aromatic hydrocarbons and alicyclic hydrocarbons.
  • hydrocarbons it is preferable to use chain hydrocarbons and alicyclic hydrocarbons, more preferably to use chain hydrocarbons, and paraffin-based hydrocarbons, olefin-based hydrocarbons or double bonds. It is more preferable to use a hydrocarbon containing one or more (however, not containing a triple bond), and it is particularly preferable to use a paraffinic hydrocarbon.
  • the chain hydrocarbons include linear hydrocarbons and branched chain hydrocarbons.
  • the kinematic viscosity of the hydrocarbon at 40 ° C. is preferably 0.01 mm 2 / s or more and 80 mm 2 / s or less, and the weight average molecular weight is preferably less than 1,000.
  • the kinematic viscosity is measured at a test temperature of 40 ° C. using a Canon Fenceke backflow viscometer according to “5. Kinematic viscosity test method” of JIS K 2283: 2000.
  • the hydrocarbon contained in the gel lotion bleeds out to the surface of the gel lotion in a certain amount together with the surfactant.
  • a new fixed amount of hydrocarbon bleeds out on the surface of the gel lotion. In this way, the gel lotion can continuously release a certain amount of hydrocarbons.
  • the amount of the hydrocarbon contained in the gel lotion is not particularly limited, but is preferably 70 parts by mass or more and 99 parts by mass or less, more preferably 80 parts by mass, based on 100 parts by mass of the total of the styrene-based elastomer and the hydrocarbon. It is 98 parts by mass or less, more preferably 85 parts by mass or more and 97 parts by mass or less.
  • the hydrocarbon is preferably 50% by mass or more and 100% by mass with respect to the total mass of all the lotion components (that is, the hydrocarbon and other lotion components).
  • the hydrocarbon may be contained in a proportion of 60% by mass or more and 100% by mass or less, more preferably 70% by mass or more and 100% by mass or less.
  • the surfactant used in the gel lotion contributes to the thinning of the gel lotion described above and also makes the gel lotion hydrophilic.
  • this surfactant acts on the hydrocarbon and arranges it on the surface thereof to reduce the surface tension of the hydrocarbon and increase the viscosity. Therefore, the constituent fibers of the liquid permeable sheet (fabric sheet). It is possible to easily form a thin film portion of the gel lotion between them.
  • surfactants examples include cationic surfactants, anionic surfactants, nonionic surfactants and the like.
  • cationic surfactants examples include cationic surfactants, anionic surfactants, nonionic surfactants and the like.
  • nonionic surfactant it is preferable to use a nonionic surfactant.
  • nonionic surfactant when such a nonionic surfactant is used, there is an advantage that the surfactant can be easily continuously released from the gel lotion and the irritation of the gel lotion to the skin can be reduced.
  • the nonionic surfactant is not particularly limited, and for example, an ether-based surfactant such as polyoxyalkylene alkyl ether and polyoxyalkylene alkyl aryl ether; polyglycerin fatty acid ester, sucrose fatty acid ester, and polyoxyalkylene fatty acid ester. , Ether-based surfactants such as polyoxyalkylene polyol fatty acid ester and the like. Among these nonionic surfactants, it is preferable to use an ester-based surfactant from the viewpoint of ease of forming a thin film portion and the like.
  • the surfactant used in the gel lotion is preferably one having an HLB value of 7 or more and 20 or less, and more preferably one having an HLB value of 10 or more and 18 or less.
  • the bleed-out surfactant has the liquid diffusivity of the liquid permeable sheet (fabric sheet) (particularly, the liquid diffusion when the body fluid is repeatedly supplied). There is an advantage that sex) can be improved.
  • surfactant having an HLB value of 7 or more and 20 or less examples include ether-based surfactants such as polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, and polyoxyethylene alkyl phenyl ether; polyglycerin fatty acid SL. , Sucrose fatty acid ester, polyoxyethylene glycerin fatty acid ester (for example, polyoxyethylene glycerin monostearic acid ester, polyoxyethylene glycerin triisostearic acid ester, etc.), polyoxyethylene sorbitan fatty acid ester (for example, polyoxyethylene sorbitan monolauric acid).
  • ether-based surfactants such as polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, and polyoxyethylene alkyl phenyl ether
  • polyglycerin fatty acid SL. Sucrose fatty acid ester, polyoxyethylene glycerin fatty acid ester (for example, polyoxyethylene g
  • ester-based surfactants such as glycol fatty acid esters.
  • ester-based surfactants other than the ester-based surfactants exemplified above include ceramera manufactured by Toyobo Co., Ltd.
  • biosurfactant having a glycolipid structure in which a fatty acid is ester-bonded to a hydroxyl group of mannosyl erythritol can also be used.
  • the ester-based surfactant has a fatty acid ester structure
  • the number of carbon atoms of the fatty acid is preferably 8 or more and 20 or less, preferably 10 or more and 18 or less, in order to realize an HLB value of 7 or more and 20 or less. More preferably, it is more preferably 12 or more and 16 or less.
  • the HLB value is a value indicating the degree of affinity of the surfactant with water and oil, and is "synthesis and application of the surfactant" (Oda, Teramura, Maki Shoten (1957)).
  • Page 501 means the value calculated using the following formula.
  • HLB value [( ⁇ inorganic value) / ( ⁇ organic value)] ⁇ 10
  • the HLB value takes a value from 0 to 20, and the closer it is to 0, the higher the lipophilicity, and the closer it is to 20, the higher the hydrophilicity.
  • the amount of the surfactant contained in the gel lotion is not particularly limited, but is preferably 1 with respect to the mass of the gel lotion (100% by mass) from the viewpoint of ease of forming a thin film portion and liquid diffusivity. It is by mass% or more and 20% by mass or less, more preferably 2% by mass or more and 15% by mass or less, and further preferably 2% by mass or more and 10% by mass or less.
  • the gel lotion used in the present invention may contain other components other than the styrene elastomer, hydrocarbons and surfactants as long as the effects of the present invention are not impaired.
  • Such other components include antioxidants such as, for example, 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), propyl zeoliteate; stilbite, rhombite. , Natural zeolites such as butylatedite, natrolite, stilbite, and somosonite; synthetic zeolites and the like.
  • the absorber 40 is arranged between the liquid permeable sheet 20 and the liquid permeable sheet 30, and the liquid permeable sheet 20 is thickened. It is formed by an absorbent member having a predetermined liquid-absorbing property and liquid-retaining property that can absorb and hold the body fluid that has permeated in the longitudinal direction T. As shown in FIG. 8, the absorber 40 extends over a wide range in the longitudinal direction L of the sanitary napkin 10 in a plan view, and a substantially central portion of the longitudinal direction L is inward in the width direction W. It has a vertically long outer shape that is narrowed toward.
  • the outer shape of the absorber is not limited to such an aspect, and an arbitrary outer shape (for example, rectangular shape, elliptical shape, hourglass shape, etc.) and size according to various uses should be adopted. Can be done.
  • the absorbent member that can be used as an absorber is not particularly limited as long as it can absorb and retain at least a liquid such as a body fluid, and any absorbent member known in the art can be adopted. it can.
  • examples of such an absorbent member include one in which at least one absorbent core made of an absorbent material is covered with a core wrap sheet such as a hydrophilic tissue.
  • examples of the absorbent material constituting the absorbent core include hydrophilic fibers and highly absorbent polymers, and more specifically, cellulosic fibers such as crushed pulp, cotton, rayon, and acetate; acrylic. Granules made of highly absorbent polymers such as sodium acid copolymers; and mixtures of these in any combination.
  • the thickness, basis weight, etc. of the absorber are not particularly limited, and any thickness, basis weight, etc. can be adopted according to the desired absorption performance, flexibility, and the like.
  • the absorber 40 is a liquid-permeable sheet 20 on the skin side surface and a liquid-impermeable sheet 30 on the non-skin side surface, respectively, and any bonding means such as a hot melt type adhesive. It is joined by.
  • the liquid-impermeable sheet 30 is arranged on the non-skin side T 2 of the absorbent body 40, transmission of bodily fluids discharged by the wearer It is formed of a liquid-impermeable sheet-like member that functions to prevent the body fluid from leaking to the wearer's underwear or the like.
  • a liquid-impermeable sheet does not permeate a liquid such as a body fluid, but preferably has a predetermined air permeability.
  • the moisture released from the absorber (specifically, the moisture derived from the body fluid or the like absorbed and retained by the absorber) is impermeable to the liquid. Since it is easy to release the moisture to the outside of the absorbent article through the sex sheet, it is possible to prevent moisture from accumulating inside the absorbent article or between the absorbent article and the wearer's skin surface.
  • the liquid-impermeable sheet-like member that can be used as a liquid-impermeable sheet has various properties that can be used as a liquid-impermeable sheet for absorbent articles (for example, liquid impermeability, flexibility, strength, etc.). It is not particularly limited as long as it has, for example, any hydrophobic thermoplastic resin fiber (for example, polyolefin-based fiber such as polyethylene (PE), polypropylene (PP), polyester-based fiber such as polyethylene terephthalate (PET)). , Various composite fibers such as core-sheath type); Perforated or non-perforated resin film formed of hydrophobic thermoplastic resin such as PE or PP; Non-woven fabric is attached to the resin film. Combined laminate; Any liquid-impermeable sheet such as a laminated non-woven fabric such as polyethylene non-woven fabric can be used.
  • any hydrophobic thermoplastic resin fiber for example, polyolefin-based fiber such as polyethylene (PE), polypropylene (PP), polyester-based
  • the thickness, basis weight, outer shape, etc. of the liquid-impermeable sheet are not particularly limited, and any thickness, basis weight, outer shape, etc. can be adopted according to the desired leakage-proof performance, breathability, strength, etc. ..
  • the absorbent article of the present invention is not limited to the above-mentioned embodiments and the like, and can be appropriately combined, substituted, modified, etc. within a range that does not deviate from the purpose and purpose of the present invention.
  • the ordinal numbers such as “first” and “second” are for distinguishing the items to which the ordinal numbers are attached, and mean the order, priority, importance, etc. of each item. It's not something to do.
  • Example 1 2 parts of SEEPS (manufactured by Kuraray Co., Ltd., Septon 4055, styrene content: 30% by mass, weight average molecular weight: about 250,000) and polysorbate 20 (manufactured by Nichiyu Co., Ltd., raw material trade name: Nonion LT-20, HLB: 16.7) was heated from 0.1 parts by mass to 16.7 parts by mass at about 140 ° C.
  • Pearl Ream EX manufactured by Nichiyu Co., Ltd., liquid isoparaffin, isobutene and n-butene).
  • Example 2 Gel lotion No. In No. 1, as an ester-based surfactant, it was dissolved in triglyceride (Panasate 810S, manufactured by Nichiyu Co., Ltd.) instead of polysorbate 20 (Nonion LT-20, HLB: 16.7, manufactured by Nichiyu Co., Ltd.). , 50% Ceramera (mannosyl erythritol manufactured by Toyo Boseki Co., Ltd., a biosurfactant having a glycolipid structure in which a fatty acid is ester-bonded to a hydroxyl group) was added to liquid rapid paraffin by adding 0.1 parts by mass to 16.7 parts by mass. Gel lotion No. 1 was obtained in the same manner as in Adjustment Example 1 except that it was heated. I got 2.
  • the top sheet (hydrophilic spunbonded non-woven fabric, basis weight 18 g / m 2 ) is alternately formed with concave portions and convex portions extending in the longitudinal direction so that there are 21 convex portions per 7 cm in width. Then, gel lotion No. 2 and No. No. 3 was applied to the back surface of the convex portion with a coating amount of 0.05 g / m / piece.
  • the back surface of the recess of this top sheet is adhered to a second sheet (manufactured by Asahi Kasei Corporation, hydrophilic spunbonded non-woven fabric, basis weight 18 g / m 2 ) by heat embossing to improve the absorption rate and liquid diffusivity of this laminate. It was evaluated by the following method. (1) A load cylinder with a diameter of 7 cm and 200 g is placed on the upper surface of the top sheet, 80 cc of artificial urine is injected into the cylinder, and the required time (seconds) is measured. Measure the fluid diffusion of artificial urine. (2) Ten minutes after the start of injection of artificial urine, the same amount of artificial urine is injected again, and the same measurement as above is performed. (3) Injection is performed 3 times in total (240 cc in total). The results are shown in Table 3.
  • the droplet diameter increased as the concentration of the surfactant added to the gel increased.
  • Gel lotion No. It is considered that the reason why the droplet diameter spreads greatly when a small amount of 2 is added is that the solvent itself easily bleeds out because triglyceride is used as the solvent, and as a result, the droplet diameter of the ceramica is improved.
  • the distilled water diffused along the gel lotion coated in a bead shape. Distilled water also diffused in the width direction of the gel lotion beyond the width of the gel lotion. Therefore, it is considered that the surfactant spread from the gel lotion to the non-woven fabric and the surfactant was bleeded out efficiently. In addition, gel lotion No. No 1 was measured.
  • the gel lotion No. In No. 2 the absorption rate could be maintained in the 10-second range until the third time. It is considered that this is because the liquid diffuses in the top sheet from the 7 cm load cylinder even at the time of the third injection in which the capacity of the absorber becomes full and it becomes difficult to absorb.
  • the liquid diffusion of the top sheet was triggered by the embossed portion of the concave portion among the concave portion and the convex portion extending in the longitudinal direction. It is considered that this is because the fiber density of the embossed portion is high and the capillary force works.
  • no gel lotion (none) or when no ester-based surfactant was added No.
  • the absorption rate dropped to the 20-second range for the third time because it was originally attached to the non-woven fabric. It is probable that the fiber oil (surfactant) was leaked due to repeated injection of artificial urine.
  • Second sheet 10 Sanitary napkin 20 Liquid permeable sheet 210 Convex part 220 Concave 30 Liquid impermeable sheet 40 Absorber 50 Side sheet 60 Gel lotion 610 Thin film part

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Abstract

La présente invention concerne un article absorbant qui démontre une meilleure diffusivité de fluide corporel dans une absorption répétée. De plus, la présente invention concerne un article absorbant qui peut démontrer une fonction de lotion et qui démontre une meilleure fonction de transfert de liquide et une fonction de suppression de retour de liquide. Selon la présente invention, l'article absorbant comprend des sections d'application de lotion de gel (5) dans lesquelles une lotion de gel spécifique est appliquée sur au moins des parties d'une région qui chevauche une couche d'absorption (4) dans une direction d'épaisseur dans une feuille de fibres disposée entre une feuille supérieure (2) et la couche d'absorption (4). La région de la feuille de fibres dans laquelle sont agencées les sections d'application de lotion de gel (5) comprend une section à densité de fibres élevée comportant une densité de fibres plus élevée que celle d'une section périphérique. De plus, selon la présente invention, l'article absorbant comprend une feuille de tissu qui est disposée plus près d'un côté tourné vers la peau qu'un corps d'absorption (40) et qui contient des fibres (2F) ; ladite feuille de tissu comprend une lotion de gel spécifique (60) ; et au moins une partie de la lotion de gel est disposée sous la forme d'une pluralité de parties de membrane mince (610) qui s'étendent le long d'une pluralité de parties de fibre constituant les fibres (2F).
PCT/JP2020/016967 2019-04-19 2020-04-17 Article absorbant WO2020213733A1 (fr)

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