WO2023106112A1 - Indicator for absorbent article, and absorbent article - Google Patents

Indicator for absorbent article, and absorbent article Download PDF

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Publication number
WO2023106112A1
WO2023106112A1 PCT/JP2022/043383 JP2022043383W WO2023106112A1 WO 2023106112 A1 WO2023106112 A1 WO 2023106112A1 JP 2022043383 W JP2022043383 W JP 2022043383W WO 2023106112 A1 WO2023106112 A1 WO 2023106112A1
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Prior art keywords
indicator
urine
specific gravity
mass
color
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PCT/JP2022/043383
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French (fr)
Japanese (ja)
Inventor
裕之 原田
浩之 丹治
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ユニ・チャーム株式会社
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Publication of WO2023106112A1 publication Critical patent/WO2023106112A1/en

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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
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/56—Wetness-indicators or colourants

Definitions

  • the present invention relates to indicators used in absorbent articles such as disposable diapers, and absorbent articles including the same.
  • absorbent articles such as disposable diapers
  • absorbent articles equipped with indicators that can detect the presence or absence of urination and changes in the health condition of the wearer by means of color changes.
  • Patent Document 1 discloses an indicator that improves responsiveness to salt concentration by mixing a surfactant into a pH indicator and converts changes in urine specific gravity into color changes of the pH indicator. .
  • thermoplastic indicator composition adjusted to alkalinity.
  • a water-soluble indicator such as that of Patent Document 1 dissolves in a short period of time when it comes into contact with urine, so there was a risk that it could only detect urine specific gravity in the early stages of urination and could not accurately detect changes in urine specific gravity. Furthermore, such a water-soluble indicator is susceptible to moisture, and thus reacts to moisture during storage before use and becomes discolored, and there is a risk that changes in urine specific gravity cannot be accurately detected during use.
  • thermoplastic indicator composition as in Patent Document 2 in order to address these problems, such a composition lacks reaction stability when in contact with urine. Since each component is mainly blended, the reactivity for detection of urine specific gravity is low, and there is still a risk that changes in urine specific gravity cannot be detected with high accuracy.
  • the present invention provides an indicator for an absorbent article that is difficult to dissolve in water such as urine and humidity and that can accurately detect changes in urine specific gravity, and an absorbent article containing the same. aim.
  • One aspect (aspect 1) of the present invention is an indicator for an absorbent article,
  • the indicator is adjusted to an alkaline appearance color in the initial state before contact with urine, and can change color according to urine specific gravity when in contact with urine, a pH indicator; 20% by mass or more of an aliphatic alcohol that is solid at room temperature; At least one component of a hydrophilic polymer of 10% by mass or more and an amine-based cationic surfactant of 10% by mass or more;
  • An indicator characterized by comprising:
  • the indicator of this aspect 1 depends on the urine specific gravity (i.e., Depending on the concentration of ions such as sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in the urine, the appearance color changes from that on the alkaline side.
  • the wearer of the absorbent article or an assistant thereof can easily recognize the change in the urine specific gravity.
  • the indicator of this aspect 1 contains a predetermined amount of an aliphatic alcohol that is solid at room temperature (20 ° C.), so that it is difficult to dissolve in moisture such as urine and moisture, and the hydrophilic polymer and amine
  • the responsiveness of color change to changes in urine specific gravity upon contact with urine is high, even when the amount of change in urine specific gravity is small. It can be clearly discolored.
  • the indicator of aspect 1 is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
  • the indicator of aspect 1 is characterized in that the aliphatic alcohol has a melting point of higher than 40°C and lower than or equal to 110°C.
  • the indicator of this aspect 2 since the aliphatic alcohol has the above-mentioned specific melting point, when it is applied to a substrate such as a nonwoven fabric or a film in a molten state, cooling and solidification progresses, and the indicator is placed on the substrate. It can be uniformly formed at a precise position. As a result, the indicator of aspect 2 can quickly change color upon contact with sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in urine. In addition, even if the change in color is small, the change in color is easy to visually recognize, so the change in urine specific gravity can be detected more accurately and reliably.
  • sodium ions Na +
  • potassium ions K +
  • Ca 2+ calcium ions
  • Mg 2+ magnesium ions
  • the indicator of aspect 1 or 2 is characterized in that the hydrophilic polymer contains a polyamide.
  • the hydrophilic polymer of the indicator of aspect 3 contains a polyamide, it acts on the shape change of the pH indicator, widens the color change range of the urine specific gravity, and has a strong dissolving action and a fast response speed. there is As a result, the indicator of aspect 3 can accurately detect even a wide range of changes in urine specific gravity.
  • the indicator according to any one of aspects 1 to 3 is characterized in that the amine-based cationic surfactant contains a quaternary ammonium salt.
  • the indicator of aspect 4 since the amine-based cationic surfactant contains a quaternary ammonium salt, it has high surface activity and a faster discoloration rate when it comes into contact with urine. As a result, the indicator of aspect 4 can more accurately detect changes in urine specific gravity.
  • the indicator according to any one of aspects 1 to 4 is characterized in that two or more types of pH indicators are included as the pH indicator.
  • the indicator of this aspect 5 can clearly change color even for urine with a smaller specific gravity difference, so that changes in urine specific gravity can be detected more accurately and reliably. can be detected.
  • the indicator of this aspect 5 can clearly change color even for urine with a smaller specific gravity difference, so that changes in urine specific gravity can be detected more accurately and reliably. can be detected.
  • two or more types of pH indicators with different color change ranges it is possible to widen the detection range of urine specific gravity, increase the degree of color change due to changes in urine specific gravity, and make it easier to see.
  • the indicator of aspect 6 contains the above-mentioned sugar alcohol component, the hydrophilicity is enhanced, and the rate of discoloration upon contact with urine can be increased.
  • the indicator according to any one of aspects 1 to 6 above further comprises at least one component of wax, oil and tackifying resin as a hydrophobic component.
  • the indicator of aspect 7 contains the above-mentioned specific hydrophobic component, it has high fixability to substrates such as nonwoven fabrics and films, and the indicator can be accurately formed at a predetermined position on the substrate. As a result, the indicator of aspect 7 can more accurately and reliably detect changes in urine specific gravity.
  • the indicator according to any one of aspects 1 to 7 is characterized by further containing sodium carbonate as an alkalizing agent.
  • the indicator of this aspect 8 comprises sodium carbonate (Na 2 CO 3 ) as an alkalizing agent, such sodium carbonate in combination with other alkalizing agents such as sodium hydroxide (NaOH) and potassium carbonate (K 2 CO 3 ).
  • Na 2 CO 3 sodium carbonate
  • other alkalizing agents such as sodium hydroxide (NaOH) and potassium carbonate (K 2 CO 3 ).
  • NaOH sodium hydroxide
  • K 2 CO 3 potassium carbonate
  • the indicator in yet another aspect (aspect 9) of the present invention, changes color to blue or green when it comes into contact with low specific gravity urine, and when it comes into contact with high specific gravity urine Characterized by discoloration to yellow or orange.
  • the indicator of this aspect 9 Unlike the color change for detecting the presence or absence of urination (that is, the pH indicator in the indicator changes color from the acidic color to the alkaline color), the indicator of this aspect 9 turns blue when it comes into contact with low specific gravity urine. Or it turns green and turns yellow or orange when it comes into contact with urine with a high specific gravity. In particular, the color change from the initial color before contact with urine to yellow or orange upon contact with urine having a high specific gravity is more easily visible. As a result, the indicator of aspect 9 can more accurately and easily detect changes in urine specific gravity.
  • Yet another aspect (aspect 10) of the present invention is an absorbent article characterized by including the indicator according to any one of aspects 1 to 9 above.
  • the absorbent article of this aspect 10 includes the indicator of any one of the above aspects 1 to 7, and can accurately detect changes in the urine specific gravity of the wearer.
  • the assistant can accurately recognize the change in the wearer's urine specific gravity.
  • the absorbent article of aspect 10 can more accurately ascertain when the wearer, such as an infant, is toilet training and signs of dehydration.
  • the indicator of the present invention is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
  • FIG. 1 is a perspective view of a disposable diaper 1 to which an indicator 5 according to one embodiment of the invention is applied.
  • FIG. 2 is an enlarged end view of a section of the disposable diaper 1 in FIG. 1 taken along line II-II.
  • the indicator of the present invention will be described in detail below using an embodiment applied to a disposable diaper, which is an example of absorbent articles.
  • the relatively proximal side with respect to the wearer's skin surface is defined as the “skin-facing surface.”
  • the “non-skin facing side” refers to the “distal side relative to the wearer's skin surface when the absorbent article is worn”.
  • FIG. 1 is a perspective view of a disposable diaper 1 to which an indicator 5 according to one embodiment of the present invention is applied
  • FIG. 2 is an enlarged end view of a cross section of the disposable diaper 1 along line II-II in FIG. be.
  • the disposable diaper 1 has a front portion located on the lower abdomen of the wearer when worn, a rear portion located on the buttocks of the wearer when worn, and a front portion positioned between the front portion and the rear portion. a middle portion positioned at the crotch portion of the wearer when worn.
  • the disposable diaper 1 is formed by the upper end portion of the front portion and the upper end portion of the rear portion by joining both the left and right ends of the front portion and the left and right ends of the rear portion. It has a pants-type external shape with a waist opening and a pair of leg openings formed on both sides in the left-right direction of the intermediate portion. That is, the disposable diaper 1 is a so-called pants-type disposable diaper.
  • the disposable diaper 1 includes a liquid-permeable topsheet 2 positioned on the skin-facing side in the thickness direction and a liquid-impermeable topsheet 2 positioned on the non-skin-facing side in the thickness direction, similarly to conventional disposable diapers.
  • a permeable backsheet 3 a liquid-absorbent absorbent 4 provided between these two sheets, and a liquid-responsive indicator 5 provided between the absorbent 4 and the backsheet 3.
  • the absorbent body 4 consists of an absorbent core 4A made of a water-absorbent material such as pulp or superabsorbent polymer (SAP), and a core wrap sheet 4B made of a hydrophilic sheet such as tissue covering the entire absorbent core 4A. , is composed of
  • the indicator 5 is obtained by melting an indicator composition containing each component described later, applying it to the skin-facing surface side of the sheet-like substrate forming the backsheet 3, and then cooling it. It is formed by solidifying with
  • the means for forming the indicator is not limited to the above.
  • the sheet-shaped molding is further formed into an absorbent body and a back sheet.
  • the indicator composition is melted and applied to the surface of a sheet-like substrate (for example, a sheet-like substrate different from the sheet-like substrate that forms the back sheet).
  • a laminate formed by further cooling and solidifying it may be placed between the absorbent body and the backsheet.
  • the position where the indicator is arranged is not particularly limited as long as it can be contacted by the wearer's urine and visible from the outer surface of the absorbent article. It can be arranged at any position according to desired visibility and the like.
  • the indicator 5 is positioned substantially in the center of the disposable diaper 1 in the left-right direction and is arranged so as to extend along the front, intermediate and rear surfaces.
  • the placement position of the indicator is not particularly limited, but the indicator is placed in a wide range from at least the middle part corresponding to the crotch part of the wearer to the back part corresponding to the buttocks of the wearer. is preferred.
  • the left-right direction of the disposable diaper 1 corresponds to the width direction of the disposable diaper 1 in the unfolded state, and the direction along the front, intermediate and rear portions corresponds to the longitudinal direction of the disposable diaper 1 in the unfolded state.
  • the indicator 5 used in the disposable diaper 1 of the above-described embodiment is adjusted to have an alkaline appearance color in the initial state before coming into contact with urine, and can change color according to urine specific gravity when coming into contact with urine.
  • a pH indicator 20% by mass or more of an aliphatic alcohol that is solid at room temperature, 10% by mass or more of a hydrophilic polymer, and 10% by mass or more of an amine-based cationic surfactant. and are specific indicators.
  • the indicator 5 of the present embodiment differs from the color change for detecting the presence or absence of urination (that is, the color change from the acidic color of the pH indicator in the indicator to the alkaline color), depending on the urine specific gravity (that is, , the concentration of ions such as Na + , K + , Ca 2+ , and Mg 2+ in the urine), so that the wearer of the disposable diaper 1 or an assistant recognizes the change in urine specific gravity. It's getting easier.
  • the indicator 5 contains a predetermined amount of an aliphatic alcohol that is solid at room temperature (that is, at a temperature of 20° C.), it is difficult to dissolve in moisture such as urine and moisture, and is a hydrophilic polymer and When at least one component among amine-based cationic surfactants is contained in a predetermined amount, the responsiveness of color change to changes in urine specific gravity upon contact with urine is high, and the amount of change in urine specific gravity is small. However, it can be clearly discolored.
  • the indicator 5 is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
  • the disposable diaper 1 including such a unique indicator 5 can accurately detect changes in the urine specific gravity of the wearer, the wearer of the disposable diaper 1 or an assistant (for example, a mother of an infant or Caregivers who care for the wearer, etc.) can accurately recognize changes in the wearer's urine specific gravity. As a result, the disposable diaper 1 including the indicator 5 can more accurately grasp the potty training period of the wearer such as an infant and the signs of dehydration.
  • the constituent members other than the indicator are not particularly limited, and arbitrary constituent members can be used according to the type and application of the absorbent article.
  • the topsheet 2 is arranged at a position on the side facing the skin in the thickness direction of the disposable diaper 1, and is a contact surface that can come into contact with the wearer's skin, that is, the surface facing the skin of the disposable diaper 1. It forms the surface on the face side, and is formed of a liquid-permeable sheet-like member such as a nonwoven fabric.
  • the outer shape, various dimensions, basis weight, etc. of the topsheet are not particularly limited as long as they can be used as the topsheet of an absorbent article, and can be arbitrarily selected depending on the desired liquid permeability, touch, flexibility, strength, etc. External shape, various dimensions, basis weight, etc. can be adopted.
  • the backsheet 3 is arranged at a position on the non-skin facing side in the thickness direction of the disposable diaper 1, and forms the surface of the disposable diaper 1 on the non-skin facing side. It is formed of a liquid-impermeable sheet-like member such as a resin film or a hydrophobic nonwoven fabric that can prevent leakage of excrement such as urine excreted by the wearer of the disposable diaper 1 to the outside of the disposable diaper 1.
  • a liquid-impermeable sheet-like member such as a resin film or a hydrophobic nonwoven fabric that can prevent leakage of excrement such as urine excreted by the wearer of the disposable diaper 1 to the outside of the disposable diaper 1.
  • the outer shape, various dimensions, basis weight, etc. of the backsheet are not particularly limited as long as it can be used as the backsheet of the absorbent article, and any outer shape according to the desired leakproof performance, breathability, strength, etc. , various dimensions, basis weight, and the like can be adopted.
  • the absorber 4 is disposed between the topsheet 2 and the backsheet 3, and is capable of absorbing and retaining excrement such as urine that permeates the topsheet 2. It is formed by an absorbent member having liquid properties.
  • the absorbent member that can be used for the absorbent body is not particularly limited as long as it can absorb and retain excrement such as urine.
  • An absorbent core 4A made of an absorbent material containing at least one, and at least one liquid-permeable core wrap sheet 4B covering the entire outer surface of the absorbent core (for example, tissue or the like made of hydrophilic cellulosic fibers) It is composed by
  • the water-absorbing fibers for example, pulp fibers (for example, pulverized pulp), cotton, rayon, cellulosic fibers such as acetate, and the like can be used.
  • superabsorbent polymer for example, starch-based superabsorbent polymers; granular materials such as synthetic polymer-based superabsorbent polymers (so-called “SAP”) such as sodium acrylate copolymers can be used.
  • SAP synthetic polymer-based superabsorbent polymers
  • the outer shape, various dimensions, basis weight, etc. of the absorbent are not particularly limited as long as they can be used as the absorbent of the absorbent article, and any outer shape according to the desired water absorption, flexibility, strength, etc. A shape, various dimensions, basis weight, etc. can be adopted.
  • the absorbent article to which the indicator of the present invention is applied is not particularly limited as long as it is an absorbent article that absorbs at least urine. It can be applied to various absorbent articles such as diapers and incontinence pads.
  • the indicator of the present invention when the indicator of the present invention is applied to disposable diapers for toilet training of infants, by appropriately visualizing changes in the specific gravity of urine excreted from the infant, the infant's body is ready for potty training. It has the advantage of being able to estimate whether or not.
  • the indicator of the present invention when the indicator of the present invention is applied to disposable diapers for adults, by appropriately visualizing changes in the specific gravity of urine excreted from adult wearers such as care recipients, it is possible to predict dehydration symptoms. has the advantage of being able to detect
  • the indicator of the present invention will be described in more detail below using the indicator 5 of the above-described embodiment.
  • the indicator 5 which is an embodiment of the present invention, is adjusted to an alkaline appearance color in the initial state before contact with urine, and can change color according to the urine specific gravity when it contacts urine.
  • a pH indicator 20% by mass or more of an aliphatic alcohol that is solid at room temperature, 10% by mass or more of a hydrophilic polymer, and 10% by mass or more of an amine-based cationic surfactant. , is included.
  • the indicator 5 In the initial state before contact with urine, the indicator 5 is adjusted to have an alkaline exterior color, but when it comes into contact with urine excreted from the wearer of the disposable diaper 1, the indicator 5 changes color to an acidic exterior color. At this time, the indicator 5 changes color tones depending on the value of the specific gravity of the urine.
  • the degree of coloration of the indicator may be determined by the naked eye, or may be determined by optically measured reflectance or the like.
  • the color tone of the indicator can be determined by comparing the color tone of a standard color tone table (that is, a color sample) prepared in advance with the naked eye.
  • a photographing means such as a digital camera or a smartphone is processed with an image processing program installed on any computer or smartphone.
  • the appearance colors on the alkaline side and the acidic side are determined by the relative pH relationship before and after coloration due to contact with urine. Varies by type. For example, when bromothymol blue is used as the pH indicator, the appearance color on the alkaline side is purple, blue or bluish green, and the appearance color on the acidic side is yellowish green, yellow or orange.
  • the indicator of the present invention can Therefore, when applied to an absorbent article such as a disposable diaper, the wearer of the absorbent article or a person assisting the absorbent article can easily recognize the change in the urine specific gravity.
  • the indicator of the present invention preferably changes color to blue or green when it comes into contact with low specific gravity urine, and changes color to yellow or orange when it comes into contact with high specific gravity urine.
  • Such an indicator turns blue or green when it comes into contact with low specific gravity urine, unlike the color change for detecting the presence or absence of urination, that is, the color change of the pH indicator in the indicator from the acidic color to the alkaline color.
  • the wearer of the absorbent article or its assistant can easily recognize the change in the urine specific gravity.
  • the change in color from the initial color before contact with urine to yellow or orange when it comes into contact with urine having a high specific gravity becomes more visible. This allows such an indicator to more accurately and easily detect changes in urine specific gravity.
  • the means for adjusting the color of the indicator in the initial state before it comes into contact with urine to an alkaline appearance is not particularly limited. agents (for example, some pH adjusters such as bases, salts, buffers, etc.).
  • the pH indicator is not particularly limited as long as it can be used as an indicator for absorbent articles, but a pH indicator whose dissociation is promoted by an increase in ionic strength is preferred.
  • Specific examples of such pH indicators include bromothymol blue (BTB), gentian violet, bromocresol purple, malachite green, thymol blue, methyl yellow, bromophenol blue, congo red, methyl orange, litmus, phenol red.
  • pH indicator chlorophenol red, neutral red, bromocresol green, methyl red, naphtholphthalein, cresol red, cresolphthalein, phenolphthalein, thymolphthalein, and alizarin yellow R.
  • One pH indicator may be used alone, or two or more pH indicators may be used in combination.
  • Preferable pH indicators include bromothymol blue (BTB), bromocresol purple, thymol blue, phenol red, chlorophenol red, bromocresol green and methyl red. These pH indicators are preferred because increased ionic strength promotes dissociation.
  • the indicator of the present invention preferably contains two or more types of pH indicators as pH indicators.
  • two or more types of pH indicators By using a combination of two or more types of pH indicators, even urine with a smaller specific gravity difference can be clearly discolored, so changes in urine specific gravity can be detected more accurately and reliably.
  • two or more types of pH indicators with different color change ranges it is possible to widen the detection range of urine specific gravity, increase the degree of color change due to changes in urine specific gravity, and make it easier to see.
  • a combination of bromothymol blue and other pH indicators is preferable.
  • a combination is used as a pH indicator, there is an advantage that the change in color tone can be increased and the color change range can be expanded.
  • Other pH indicators that can be used in combination with bromothymol blue include, for example, thymol blue, phenol red and methyl red. Among these pH indicators, it is preferable to use methyl red.
  • a combination of bromothymol blue and methyl red can realize a stable and wide-ranging color change (color reaction).
  • the content of the pH indicator contained in the indicator is not particularly limited, and can be appropriately set in consideration of the responsiveness and visibility of the color reaction.
  • a content is, for example, 0.01% by mass to 10.0% by mass, preferably 0.01% by mass to 5.0% by mass, relative to the total mass (100% by mass) of the indicator composition. It is 0 mass %, more preferably 0.05 mass % to 4.0 mass %.
  • the aliphatic alcohol that can be used for the indicator of the present invention is not particularly limited as long as it is solid at room temperature and can be used as an indicator for absorbent articles, for example, has 8 to 34 carbon atoms (C8 to C34). and fatty alcohols such as As for the fatty alcohol, one type of fatty alcohol may be used alone, or two or more types of fatty alcohol may be used in combination.
  • Preferred fatty alcohols include fatty alcohols having a melting point higher than 40° C. and lower than or equal to 110° C. Specific examples include 1-hexadecanol, 1-octadecanol, 1-eicosanol, 1- docosanol, 1-tetracosanol, 1-hexacosanol, 1-octacosanol, 1,12-dodecanediol and the like.
  • the aliphatic alcohol contained in the indicator has such a specific melting point, when the indicator composition is applied in a molten state to a base material such as a nonwoven fabric or a film, cooling and solidification proceeds, and the indicator is removed.
  • the indicator containing the above-mentioned specific fatty alcohol can be quickly dissolved when it comes into contact with sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in urine.
  • Na + sodium ions
  • K + potassium ions
  • Ca 2+ calcium ions
  • Mg 2+ magnesium ions
  • the content of the aliphatic alcohol contained in the indicator is not particularly limited as long as it is 20% by mass or more with respect to the total mass (100% by mass) of the indicator, and it is difficult to dissolve in water such as urine and moisture and visible It can be appropriately set in consideration of the nature and the like.
  • a content is, for example, 20% by mass to 80% by mass, preferably 30% by mass to 60% by mass, relative to the total mass (100% by mass) of the indicator composition.
  • the indicator 5, which is one embodiment of the present invention, contains at least one component of a hydrophilic polymer of 10% by mass or more and an amine-based cationic surfactant of 10% by mass or more as an essential component. .
  • a hydrophilic polymer of 10% by mass or more
  • an amine-based cationic surfactant of 10% by mass or more as an essential component.
  • the hydrophilic polymer that can be used in the indicator of the present invention is not particularly limited as long as it is a polymer having hydrophilicity. , polyacrylic acid, polyacrylamide, maleic anhydride polymer, etc.), polyol (e.g., polyethylene glycol, etc.), polyvinylpyrrolidone, polyvinyl alcohol, polyallylamine, polyethyleneimine, oxazoline-based polymer (e.g., poly (2-oxazoline), poly (2-ethyl-2-oxazoline), poly(2-methyl-2-oxazoline), etc.).
  • the hydrophilic polymer one kind of hydrophilic polymer may be used alone, or two or more kinds of hydrophilic polymers may be used in combination.
  • the hydrophilic polymer excludes the sugar alcohol polymer.
  • the indicator of the present invention preferably contains polyamide as the hydrophilic polymer.
  • the indicator When the indicator contains polyamide as a hydrophilic polymer, it acts on the shape change of the pH indicator, widens the color change range of the urine specific gravity, and has a strong dissolving action and a fast response speed. As a result, the indicator containing polyamide as the hydrophilic polymer can accurately detect a wide range of changes in urine specific gravity.
  • the polyamide preferably has a softening point of 140° C. or lower.
  • the content of the hydrophilic polymer contained in the indicator is not particularly limited as long as it is 10% by mass or more with respect to the total mass (100% by mass) of the indicator, and the responsiveness of the color reaction and visibility are taken into consideration. can be set as appropriate.
  • Such a content is, for example, 10% by mass to 40% by mass, preferably 15% by mass to 30% by mass, relative to the total mass (100% by mass) of the indicator composition.
  • the amine-based cationic surfactant that can be used in the indicator of the present invention is not particularly limited as long as it is an amine-based surfactant having a cationic hydrophilic group. Examples thereof include ionic surfactants, alkylamine salt-type surfactants, and cationic surfactants having a pyridine ring.
  • quaternary ammonium salt-type cationic surfactants include tetramethylammonium chloride, tetramethylammonium hydroxide, tetrabutylammonium chloride, dodecyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, and octyltrimethyl chloride.
  • alkylamine salt-type cationic surfactants include monomethylamine hydrochloride, dimethylamine hydrochloride and trimethylamine hydrochloride.
  • cationic surfactants having a pyridine ring include butylpyridinium chloride, dodecylpyridinium chloride and cetylpyridinium chloride.
  • one type of cationic surfactant may be used alone, or two or more types of cationic surfactants may be used in combination.
  • the indicator of the present invention preferably contains a quaternary ammonium salt as an amine-based cationic surfactant.
  • a quaternary ammonium salt as an amine-based cationic surfactant.
  • the content of the cationic surfactant contained in the indicator is not particularly limited as long as it is 10% by mass or more with respect to the total mass (100% by mass) of the indicator, and the responsiveness and visibility of the color reaction are improved. It can be set as appropriate in consideration of this. Such a content is, for example, 10% by mass to 40% by mass, preferably 15% by mass to 30% by mass, relative to the total mass (100% by mass) of the indicator composition.
  • Indicator 5 which is one embodiment of the present invention further contains a sugar alcohol component as an optional component.
  • the indicator of the present invention further contains, as a sugar alcohol component, at least one of sugar alcohols and sugar alcohol polymers at a compounding ratio of 2.5% by mass or more. is preferred.
  • the sugar alcohol component is not an essential component in the indicator of the present invention, if the indicator contains such a sugar alcohol component, the hydrophilicity of the indicator increases, and the rate of discoloration upon contact with urine can be increased. .
  • Sugar alcohol components that can be used in the indicator of the present invention include sugar alcohols and polymers thereof, specifically glycerin, erythritol, D-threitol, L-threitol, D-arabinitol, L-arabinitol, Examples thereof include sugar alcohols such as xylitol, ribitol, D-iditol, galactitol, mannitol, boremitol and perseitol, and polymers of these sugar alcohols.
  • Preferred sugar alcohol components include glycerin and its polymer polyglycerin.
  • these sugar-alcohol components may be used individually by one type of sugar-alcohol component, and may use two or more types of sugar-alcohol components together.
  • the content of the sugar alcohol component contained in the indicator is not particularly limited as long as it is 2.5% by mass or more relative to the total mass (100% by mass) of the indicator. It can be set as appropriate in consideration of this. Such a content is, for example, 2.5% by mass to 20% by mass, preferably 3.0% by mass to 15.0% by mass, relative to the total mass (100% by mass) of the indicator composition. %.
  • the indicator of the present invention preferably further comprises at least one of waxes, oils and tackifying resins as a hydrophobic component.
  • the hydrophobic component is not an essential component in the indicator of the present invention. The fixability to the material is improved, and the indicator can be accurately formed at a predetermined position on the base material. As a result, an indicator containing such a hydrophobic component can more accurately and reliably detect changes in urine specific gravity.
  • the wax that can be used for the indicator of the present invention is not particularly limited as long as it can act as a plasticizer, and examples include known natural waxes and synthetic waxes.
  • natural waxes include petroleum-derived waxes such as paraffin and microcrystalline wax (microcrystalline wax); animal-derived waxes such as beeswax and spermaceti; plant-derived waxes such as carnauba wax; and waxes derived from minerals.
  • Specific examples of synthetic waxes include polyethylene waxes, Fischer-Tropsch waxes, fatty acid amides, and the like.
  • Preferred waxes include petroleum-derived waxes such as paraffin and microcrystalline waxes.
  • the oil that can be used in the indicator of the present invention is not particularly limited as long as it can act as a plasticizer, and examples include known paraffinic oils, naphthenic oils, and aromatic oils. Preferred oils include naphthenic oils.
  • the tackifying resin that can be used in the indicator of the present invention is not particularly limited as long as it can act as a tackifier, and examples include known natural resins and petroleum-based resins.
  • natural resins include plant-derived resins such as rosin and rosin derivatives, terpenes and modified terpenes.
  • petroleum-based resins include C5-C9 aliphatic or aromatic resins, C5-C9 aliphatic and aromatic copolymer resins, and the like.
  • hydrophobic components one type of hydrophobic component may be used alone, or two or more types of hydrophobic components may be used in combination.
  • the content of the hydrophobic component contained in the indicator is not particularly limited as long as it does not impede the effects of the present invention. % by mass, preferably 1.0% by mass to 20.0% by mass.
  • Indicator 5 which is one embodiment of the present invention further contains an alkalizing agent as an optional component.
  • an alkalizing agent By containing such an alkalizing agent, the indicator 5 is less likely to have unevenness in color tone before and after coloration due to contact with urine, making it easier to visually recognize discoloration.
  • the alkalinizing agent is also used as a means for adjusting the appearance color of the indicator 5 in the initial state before coming into contact with urine to the alkaline side.
  • the alkalizing agent that can be used in the indicator of the present invention is not particularly limited, and examples thereof include known sodium carbonate (Na 2 CO 3 ), sodium hydroxide (NaOH), potassium carbonate (K 2 CO 3 ), and the like. .
  • the indicator of the present invention preferably further contains sodium carbonate as an alkalinizing agent.
  • sodium carbonate mixes more uniformly with other components in the indicator, so it is less likely that uneven discoloration or abnormal discoloration will occur. Even when the is small, the discoloration is easily visible.
  • the indicator containing sodium carbonate as an alkalinizing agent can more accurately and reliably detect changes in urine specific gravity.
  • the indicator of the present invention may further contain optional additive components that can be used in indicators for absorbent articles.
  • additive components include, but are not particularly limited to, antioxidants, light stabilizers, antibacterial agents, fragrances, and the like.
  • the indicator composition composed of the above components is not particularly limited, it can be produced by mixing using any heating and melting means.
  • the indicator of the present invention is not limited to the above-described embodiments and examples described later, and can be appropriately combined, substituted, changed, etc. within the scope of the present invention without departing from the purpose and spirit of the present invention.
  • Example 1 1-docosanol as an aliphatic alcohol, a quaternary ammonium salt as an amine cationic surfactant, a polyamide having a softening point of about 120° C. as a hydrophilic polymer, methyl red as a pH indicator and BTB, sodium carbonate as an alkalizing agent, glycerin as a sugar alcohol component, and naphthenic oil as a hydrophobic component were mixed according to the composition shown in Table 1 below to obtain an indicator composition. Next, this indicator composition was melted, applied to the surface of a sheet-like base material for forming the back sheet of a disposable diaper, and further cooled and solidified to produce an indicator of Example 1.
  • Examples 2-5 Indicators of Examples 2 to 5 were produced in the same manner as in Example 1, except that the compounding ratios and types of various components were changed as shown in Table 1 below.
  • the indicator to be evaluated was linearly coated on a general white leak-proof film (polyethylene film) used for the back sheet of disposable diapers with a width of 6 mm and a coating weight of 20 g/m 2 for discoloration evaluation.
  • a test piece of A filter paper (Advantech qualitative filter paper No. 2 manufactured by Toyo Roshi Kaisha, Ltd. (equivalent to type 2 specified in JIS P 3801 [filter paper (for chemical analysis)])
  • a plurality of types of urine having a urine specific gravity within the range of 1.000 to 1.045 are prepared, and 2 mL of each specific gravity of urine is dropped onto a filter paper placed on the indicator to be evaluated.
  • the filter paper is removed, and whether or not the discoloration of the indicator can be identified is evaluated by comparing with a color sample.
  • the case where the color change due to the difference in urine specific gravity of 0.005 can be identified is indicated as "O" (the difference in urine specific gravity can be accurately detected), and the case where the color change due to the difference in urine specific gravity as 0.010 can be identified as "X”. ” (difference in urine specific gravity cannot be detected with high accuracy).
  • Urine is brought into contact with the indicator to be evaluated, and the color of the indicator after 1 minute (color after discoloration due to urine) and the color of the indicator after 10 minutes are compared using a color sample. Evaluate color identity.
  • ⁇ color change is possible completely within 1 minute, that is, the color change speed is very fast
  • ⁇ within 1 minute
  • the color can be changed almost immediately, that is, the color change speed is fast
  • the case where both colors are similar colors is indicated as " ⁇ ” (the color can be changed more than a certain amount within 1 minute, that is, the color change speed is relatively fast). If the color is different, it is marked as "x" (cannot change color within 1 minute, that is, the speed of color change is slow).
  • Urine is brought into contact with the indicator to be evaluated, and it is evaluated whether or not the color of the indicator (color after discoloration due to urine) after 3 hours can be visually confirmed. If the color of the indicator can be clearly confirmed after 3 hours have passed, it is marked as " ⁇ " (it is very difficult to dissolve in moisture such as urine and moisture), and if the color of the indicator can be confirmed after 3 hours has passed, it is marked as " ⁇ ". ⁇ ” (difficult to dissolve in moisture such as urine and moisture), and when the color of the indicator cannot be confirmed after 3 hours, it is evaluated as “ ⁇ ” (easily soluble in moisture such as urine and moisture). .

Abstract

The present invention provides: an indicator for an absorbent article that does not readily dissolve in moisture such as urine or dampness, said indicator enabling any change in the urine specific gravity to be accurately sensed; and an absorbent article including the indicator.　This indicator for an absorbent article is characterized in: being adjusted to an alkali-side outward color in an initial state that precedes contact with urine; being capable of changing color, upon coming into contact with urine, to a color corresponding to the urine specific gravity; and containing a pH indicator, 20 mass% or more of a fatty alcohol that is solid at room temperature, and 10 mass% or more of a hydrophilic polymer and/or 10 mass% or more of an amine-based cationic surfactant.

Description

吸収性物品用のインジケータ、及びそれを含む吸収性物品Indicator for absorbent article and absorbent article containing same
　本発明は、使い捨ておむつ等の吸収性物品に用いられるインジケータ、及びそれを含む吸収性物品に関する。 The present invention relates to indicators used in absorbent articles such as disposable diapers, and absorbent articles including the same.
　使い捨ておむつ等の吸収性物品においては、排尿の有無や着用者の健康状態の変化などを色の変化により検知可能なインジケータを備えた吸収性物品が知られている。 Among absorbent articles such as disposable diapers, there are known absorbent articles equipped with indicators that can detect the presence or absence of urination and changes in the health condition of the wearer by means of color changes.
　さらに近年においては、尿比重を比色法で測定するインジケータが実用化されており、かかるインジケータは、ｐＨ指示薬や界面活性剤等の、尿比重に応じて呈色し得る成分を含む水溶液によって構成され、フィルム等の基材に浸透させて乾燥したものが使用されている。例えば、特許文献１には、ｐＨ指示薬中に界面活性剤を混合することで、塩濃度に対する応答性を向上させ、尿比重の変化をｐＨ指示薬の呈色変化に変換するインジケータが開示されている。 Furthermore, in recent years, an indicator for measuring urine specific gravity by colorimetry has been put into practical use, and such an indicator is composed of an aqueous solution containing components that can change color according to urine specific gravity, such as pH indicators and surfactants. It is used after being permeated into a base material such as a film and then dried. For example, Patent Document 1 discloses an indicator that improves responsiveness to salt concentration by mixing a surfactant into a pH indicator and converts changes in urine specific gravity into color changes of the pH indicator. .
　また、尿比重の変化に関するものではないものの、同様の原理を用いたインジケータとして、熱可塑性の固体物質からなる尿検知用のインジケータも実用化されている。例えば、特許文献２には、アルカリ性に調整された熱可塑性のインジケータ用組成物が開示されている。 Although not related to changes in urine specific gravity, urine detection indicators made of thermoplastic solid substances have also been put to practical use as indicators using the same principle. For example, US Pat. No. 6,200,008 discloses a thermoplastic indicator composition adjusted to alkalinity.
特開平５－１９６６１６号公報JP-A-5-196616 特表２０１５－５２９１５１号公報Japanese translation of PCT publication No. 2015-529151
　特許文献１のような水溶性のインジケータでは、尿に接触すると短時間で溶出してしまうため、排尿初期の尿比重しか検知できず、尿比重の変化を精度よく検知できない恐れがあった。さらに、このような水溶性のインジケータは、湿気に弱いため、使用前の保管時に湿気に反応して変色してしまい、使用時に尿比重の変化を精度よく検知できない恐れもあった。 A water-soluble indicator such as that of Patent Document 1 dissolves in a short period of time when it comes into contact with urine, so there was a risk that it could only detect urine specific gravity in the early stages of urination and could not accurately detect changes in urine specific gravity. Furthermore, such a water-soluble indicator is susceptible to moisture, and thus reacts to moisture during storage before use and becomes discolored, and there is a risk that changes in urine specific gravity cannot be accurately detected during use.
　なお、これらの問題に対処するために、特許文献２のような熱可塑性のインジケータ用組成物の配合を適用しようとしても、このような組成物は、尿と接触したときの反応の安定性を主眼として各成分が配合されているため、尿比重の検知に関しては反応性が低く、依然として尿比重の変化を精度よく検知できない恐れがある。 It should be noted that even if an attempt is made to apply the formulation of a thermoplastic indicator composition as in Patent Document 2 in order to address these problems, such a composition lacks reaction stability when in contact with urine. Since each component is mainly blended, the reactivity for detection of urine specific gravity is low, and there is still a risk that changes in urine specific gravity cannot be detected with high accuracy.
　そこで、本発明は、尿や湿気等の水分に対して溶解しにくく且つ尿比重の変化を精度よく検知することができる吸収性物品用のインジケータ、及びそれを含む吸収性物品を提供することを目的とする。 Therefore, the present invention provides an indicator for an absorbent article that is difficult to dissolve in water such as urine and humidity and that can accurately detect changes in urine specific gravity, and an absorbent article containing the same. aim.
　本発明の一態様（態様１）は、吸収性物品用のインジケータであって、
　前記インジケータは、尿と接触する前の初期状態においてアルカリ性側の外観色に調整され、尿に接触すると尿比重に応じた色に変色可能であり、
　ｐＨ指示薬と、
　２０質量％以上の、常温で固体の脂肪族アルコールと、
　１０質量％以上の親水性高分子及び１０質量％以上のアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分と、
を含むことを特徴とする、インジケータである。 One aspect (aspect 1) of the present invention is an indicator for an absorbent article,
The indicator is adjusted to an alkaline appearance color in the initial state before contact with urine, and can change color according to urine specific gravity when in contact with urine,
a pH indicator;
20% by mass or more of an aliphatic alcohol that is solid at room temperature;
At least one component of a hydrophilic polymer of 10% by mass or more and an amine-based cationic surfactant of 10% by mass or more;
An indicator characterized by comprising:
　本態様１のインジケータは、排尿の有無を検知するための変色（すなわち、インジケータ中のｐＨ指示薬の酸性側の色からアルカリ性側の色への変色）とは異なり、尿比重に応じて（すなわち、尿中のナトリウムイオン（Ｎａ＋）やカリウムイオン（Ｋ＋）、カルシウムイオン（Ｃａ２＋）、マグネシウムイオン（Ｍｇ２＋）等のイオン濃度に応じて）アルカリ性側の外観色から変色するため、使い捨ておむつ等の吸収性物品に適用したときに、吸収性物品の着用者又はその補助者が尿比重の変化を認識しやすくなっている。 Unlike the color change for detecting the presence or absence of urination (i.e., the color change from the acidic side color of the pH indicator in the indicator to the alkaline side color), the indicator of this aspect 1 depends on the urine specific gravity (i.e., Depending on the concentration of ions such as sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in the urine, the appearance color changes from that on the alkaline side. When applied to an absorbent article such as the absorbent article, the wearer of the absorbent article or an assistant thereof can easily recognize the change in the urine specific gravity.
　そして、本態様１のインジケータは、常温（２０℃）で固体の脂肪族アルコールを所定量含んでいることで、尿や湿気等の水分に対して溶解しにくく、また、親水性高分子及びアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分を所定量含んでいることで、尿と接触した時の尿比重の変化に対する変色の応答性が高く、尿比重の変化量が小さい場合でも明確に変色することができる。 Then, the indicator of this aspect 1 contains a predetermined amount of an aliphatic alcohol that is solid at room temperature (20 ° C.), so that it is difficult to dissolve in moisture such as urine and moisture, and the hydrophilic polymer and amine By containing a predetermined amount of at least one component of the cationic surfactant of the system, the responsiveness of color change to changes in urine specific gravity upon contact with urine is high, even when the amount of change in urine specific gravity is small. It can be clearly discolored.
　以上より、本態様１のインジケータは、尿や湿気等の水分に対して溶解しにくく且つ尿比重の変化を精度よく検知することができる。 As described above, the indicator of aspect 1 is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
　また、本発明の別の態様（態様２）では、上記態様１のインジケータにおいて、前記脂肪族アルコールは、４０℃より高く１１０℃以下の融点を有することを特徴とする。 In another aspect (aspect 2) of the present invention, the indicator of aspect 1 is characterized in that the aliphatic alcohol has a melting point of higher than 40°C and lower than or equal to 110°C.
　本態様２のインジケータは、脂肪族アルコールが上記特定の融点を有するものであるため、溶融状態で不織布やフィルム等の基材に塗工した時に、冷却固化が進行し、インジケータを基材上の的確な位置に均一に形成することができる。これにより、本態様２のインジケータは、尿中のナトリウムイオン（Ｎａ＋）やカリウムイオン（Ｋ＋）、カルシウムイオン（Ｃａ２＋）、マグネシウムイオン（Ｍｇ２＋）と接触した際に素早く変色することができる上、色の変化が小さい場合でも、変色が視認しやすくなっているため、尿比重の変化をより精度よく、より確実に検知することができる。 In the indicator of this aspect 2, since the aliphatic alcohol has the above-mentioned specific melting point, when it is applied to a substrate such as a nonwoven fabric or a film in a molten state, cooling and solidification progresses, and the indicator is placed on the substrate. It can be uniformly formed at a precise position. As a result, the indicator of aspect 2 can quickly change color upon contact with sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in urine. In addition, even if the change in color is small, the change in color is easy to visually recognize, so the change in urine specific gravity can be detected more accurately and reliably.
　本発明の更に別の態様（態様３）では、上記態様１又は２のインジケータにおいて、前記親水性高分子がポリアミドを含むことを特徴とする。 In still another aspect (aspect 3) of the present invention, the indicator of aspect 1 or 2 is characterized in that the hydrophilic polymer contains a polyamide.
　本態様３のインジケータは、親水性高分子がポリアミドを含むものであるため、ｐＨ指示薬の形態変化に作用し、尿比重の変色範囲が広くなっている上、溶解作用が強く、応答速度が速くなっている。これにより、本態様３のインジケータは、幅広い尿比重の変化に対しても精度よく検知することができる。 Since the hydrophilic polymer of the indicator of aspect 3 contains a polyamide, it acts on the shape change of the pH indicator, widens the color change range of the urine specific gravity, and has a strong dissolving action and a fast response speed. there is As a result, the indicator of aspect 3 can accurately detect even a wide range of changes in urine specific gravity.
　本発明の更に別の態様（態様４）では、上記態様１～３のいずれかのインジケータにおいて、前記アミン系の陽イオン界面活性剤が第４級アンモニウム塩を含むことを特徴とする。 In still another aspect (aspect 4) of the present invention, the indicator according to any one of aspects 1 to 3 is characterized in that the amine-based cationic surfactant contains a quaternary ammonium salt.
　本態様４のインジケータは、アミン系の陽イオン界面活性剤が第４級アンモニウム塩を含むものであるため、界面活性能が高く、尿と接触した時の変色速度がより速くなっている。これにより、本態様４のインジケータは、尿比重の変化をより精度よく検知することができる。 In the indicator of aspect 4, since the amine-based cationic surfactant contains a quaternary ammonium salt, it has high surface activity and a faster discoloration rate when it comes into contact with urine. As a result, the indicator of aspect 4 can more accurately detect changes in urine specific gravity.
　本発明の更に別の態様（態様５）では、上記態様１～４のいずれかのインジケータにおいて、前記ｐＨ指示薬として、２種類以上のｐＨ指示薬を含むことを特徴とする。 In still another aspect (aspect 5) of the present invention, the indicator according to any one of aspects 1 to 4 is characterized in that two or more types of pH indicators are included as the pH indicator.
　本態様５のインジケータは、２種類以上のｐＨ指示薬を組み合わせて用いることによって、より小さい比重差の尿に対しても明確に変色することができるので、尿比重の変化をより精度よく、より確実に検知することができる。また、変色域の異なる２種類以上のｐＨ指示薬を組み合わせることで、尿比重の検出範囲を広げることができ、尿比重の変化による色の変色度合いを増加させて、視認しやすくすることができる。 By using a combination of two or more types of pH indicators, the indicator of this aspect 5 can clearly change color even for urine with a smaller specific gravity difference, so that changes in urine specific gravity can be detected more accurately and reliably. can be detected. In addition, by combining two or more types of pH indicators with different color change ranges, it is possible to widen the detection range of urine specific gravity, increase the degree of color change due to changes in urine specific gravity, and make it easier to see.
　本発明の更に別の態様（態様６）では、上記態様１～５のいずれかのインジケータにおいて、糖アルコール成分として、糖アルコール及び糖アルコールの重合体のうちの少なくとも一つの成分を、２．５質量％以上の配合割合で更に含むことを特徴とする。 In still another aspect (aspect 6) of the present invention, in the indicator according to any one of aspects 1 to 5, as the sugar alcohol component, at least one component of sugar alcohol and sugar alcohol polymer is added to 2.5 It is characterized by further containing at a blending ratio of mass % or more.
　本態様６のインジケータは、上記糖アルコール成分を含むため、親水性が高まり、尿と接触したときの変色速度を高くすることができる。 Since the indicator of aspect 6 contains the above-mentioned sugar alcohol component, the hydrophilicity is enhanced, and the rate of discoloration upon contact with urine can be increased.
　本発明の更に別の態様（態様７）では、上記態様１～６のいずれかのインジケータにおいて、疎水性成分として、ワックス、オイル及び粘着付与樹脂のうちの少なくとも一つの成分を更に含むことを特徴とする。 In still another aspect (aspect 7) of the present invention, the indicator according to any one of aspects 1 to 6 above further comprises at least one component of wax, oil and tackifying resin as a hydrophobic component. and
　本態様７のインジケータは、上記特定の疎水性成分を含むものであるため、不織布やフィルム等の基材への定着性が高く、インジケータを基材上の所定の位置に的確に形成することができる。これにより、本態様７のインジケータは、尿比重の変化をより精度よく、より確実に検知することができる。 Since the indicator of aspect 7 contains the above-mentioned specific hydrophobic component, it has high fixability to substrates such as nonwoven fabrics and films, and the indicator can be accurately formed at a predetermined position on the substrate. As a result, the indicator of aspect 7 can more accurately and reliably detect changes in urine specific gravity.
　本発明の更に別の態様（態様８）では、上記態様１～７のいずれかのインジケータにおいて、アルカリ化剤として、炭酸ナトリウムを更に含むことを特徴とする。 In still another aspect (aspect 8) of the present invention, the indicator according to any one of aspects 1 to 7 is characterized by further containing sodium carbonate as an alkalizing agent.
　本態様８のインジケータは、アルカリ化剤として炭酸ナトリウム（Ｎａ２ＣＯ３）を含み、かかる炭酸ナトリウムは、水酸化ナトリウム（ＮａＯＨ）や炭酸カリウム（Ｋ２ＣＯ３）などの他のアルカリ化剤と比べて、インジケータ中の他の成分と均一に混ざることができるため、変色のムラや変色の異常が生じにくく、また、色の変化が小さい場合でも、変色が視認しやすくなっている。これにより、本態様８のインジケータは、尿比重の変化をより精度よく、より確実に検知することができる。 The indicator of this aspect 8 comprises sodium carbonate (Na 2 CO 3 ) as an alkalizing agent, such sodium carbonate in combination with other alkalizing agents such as sodium hydroxide (NaOH) and potassium carbonate (K 2 CO 3 ). In contrast, since it can be uniformly mixed with other components in the indicator, uneven color change and abnormal color change are less likely to occur, and even if the color change is small, the color change is easily visible. As a result, the indicator of aspect 8 can more accurately and reliably detect changes in urine specific gravity.
　本発明の更に別の態様（態様９）では、上記態様１～８のいずれかのインジケータにおいて、前記インジケータは、低比重の尿に接触すると青色又は緑色に変色し、高比重の尿に接触すると黄色又は橙色に変色することを特徴とする。 In yet another aspect (aspect 9) of the present invention, in the indicator according to any one of aspects 1 to 8, the indicator changes color to blue or green when it comes into contact with low specific gravity urine, and when it comes into contact with high specific gravity urine Characterized by discoloration to yellow or orange.
　本態様９のインジケータは、排尿の有無を検知するための変色（すなわち、インジケータ中のｐＨ指示薬の酸性側の色からアルカリ性側の色への変色）とは異なり、低比重の尿に接触すると青色又は緑色に変色し、高比重の尿に接触すると黄色又は橙色に変色するものであるため、使い捨ておむつ等の吸収性物品に適用したときに、吸収性物品の着用者又はその補助者が尿比重の変化を認識しやすく、特に、尿と接触する前の初期状態の色から高比重の尿に接触した時の黄色又は橙色への変色がより視認しやすくなっている。これにより、本態様９のインジケータは、尿比重の変化をより精度よく、より容易に検知することができる。 Unlike the color change for detecting the presence or absence of urination (that is, the pH indicator in the indicator changes color from the acidic color to the alkaline color), the indicator of this aspect 9 turns blue when it comes into contact with low specific gravity urine. Or it turns green and turns yellow or orange when it comes into contact with urine with a high specific gravity. In particular, the color change from the initial color before contact with urine to yellow or orange upon contact with urine having a high specific gravity is more easily visible. As a result, the indicator of aspect 9 can more accurately and easily detect changes in urine specific gravity.
　本発明の更に別の態様（態様１０）は、上記態様１～９のいずれかのインジケータを含むことを特徴とする、吸収性物品である。 Yet another aspect (aspect 10) of the present invention is an absorbent article characterized by including the indicator according to any one of aspects 1 to 9 above.
　本態様１０の吸収性物品は、上記態様１～７のいずれかのインジケータを含むものであり、着用者の尿比重の変化を精度よく検知することができるため、吸収性物品の着用者又はその補助者が着用者の尿比重の変化を的確に認識することができる。これにより、本態様１０の吸収性物品は、幼児等の着用者のトイレトレーニング時期や脱水症状の予兆などをより正確に把握することができる。 The absorbent article of this aspect 10 includes the indicator of any one of the above aspects 1 to 7, and can accurately detect changes in the urine specific gravity of the wearer. The assistant can accurately recognize the change in the wearer's urine specific gravity. As a result, the absorbent article of aspect 10 can more accurately ascertain when the wearer, such as an infant, is toilet training and signs of dehydration.
　本発明のインジケータは、尿や湿気等の水分に対して溶解しにくく且つ尿比重の変化を精度よく検知することができる。 The indicator of the present invention is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
図１は、本発明の一実施形態に係るインジケータ５を適用した使い捨ておむつ１の斜視図である。FIG. 1 is a perspective view of a disposable diaper 1 to which an indicator 5 according to one embodiment of the invention is applied. 図２は、図１における使い捨ておむつ１のＩＩ－ＩＩ線に沿った断面の拡大端面図である。FIG. 2 is an enlarged end view of a section of the disposable diaper 1 in FIG. 1 taken along line II-II.
　以下、本発明のインジケータについて、吸収性物品の一例である使い捨ておむつに適用した実施形態を用いて、詳細に説明する。なお、本明細書では、特に断りのない限り、吸収性物品の厚さ方向において、「吸収性物品の着用時に、着用者の肌面に対して相対的に近位側」を「肌対向面側」といい、「吸収性物品の着用時に、着用者の肌面に対して相対的に遠位側」を「非肌対向面側」という。 The indicator of the present invention will be described in detail below using an embodiment applied to a disposable diaper, which is an example of absorbent articles. In this specification, unless otherwise specified, in the thickness direction of the absorbent article, "when the absorbent article is worn, the relatively proximal side with respect to the wearer's skin surface" is defined as the "skin-facing surface." The "non-skin facing side" refers to the "distal side relative to the wearer's skin surface when the absorbent article is worn".
［使い捨ておむつ］
　図１は、本発明の一実施形態に係るインジケータ５を適用した使い捨ておむつ１の斜視図であり、図２は、図１における使い捨ておむつ１のＩＩ－ＩＩ線に沿った断面の拡大端面図である。 [Disposable diaper]
FIG. 1 is a perspective view of a disposable diaper 1 to which an indicator 5 according to one embodiment of the present invention is applied, and FIG. 2 is an enlarged end view of a cross section of the disposable diaper 1 along line II-II in FIG. be.
　図１に示すように、使い捨ておむつ１は、着用時に着用者の下腹部に位置する前面部と、着用時に着用者の臀部に位置する後面部と、前面部及び後面部の間に位置し且つ着用時に着用者の股下部に位置する中間部と、を備えている。使い捨ておむつ１は、前面部の左右方向の両端部と後面部の左右方向の両端部とが互いに接合されていることで、前面部の上側端部と後面部の上側端部とによって形成されるウエスト開口部と、中間部の左右方向の両側部に形成される一対のレッグ開口部とを備えた、パンツ型の外形形状を有している。すなわち、使い捨ておむつ１は、いわゆるパンツ型の使い捨ておむつである。 As shown in FIG. 1 , the disposable diaper 1 has a front portion located on the lower abdomen of the wearer when worn, a rear portion located on the buttocks of the wearer when worn, and a front portion positioned between the front portion and the rear portion. a middle portion positioned at the crotch portion of the wearer when worn. The disposable diaper 1 is formed by the upper end portion of the front portion and the upper end portion of the rear portion by joining both the left and right ends of the front portion and the left and right ends of the rear portion. It has a pants-type external shape with a waist opening and a pair of leg openings formed on both sides in the left-right direction of the intermediate portion. That is, the disposable diaper 1 is a so-called pants-type disposable diaper.
　図２に示すように、使い捨ておむつ１は、従来の使い捨ておむつと同様に、厚さ方向において肌対向面側に位置する液透過性の表面シート２と、非肌対向面側に位置する液不透過性の裏面シート３と、これら両シートの間に設けられた吸液性の吸収体４と、該吸収体４及び裏面シート３の間に設けられた液応答性のインジケータ５と、を基本構成として備えている。なお、吸収体４は、パルプや高吸収性ポリマー（ＳＡＰ）などの吸水性材料からなる吸収コア４Ａと、該吸収コア４Ａの全体を覆い且つティッシュなどの親水性シートからなるコアラップシート４Ｂと、によって構成されている。 As shown in FIG. 2, the disposable diaper 1 includes a liquid-permeable topsheet 2 positioned on the skin-facing side in the thickness direction and a liquid-impermeable topsheet 2 positioned on the non-skin-facing side in the thickness direction, similarly to conventional disposable diapers. Basically, a permeable backsheet 3, a liquid-absorbent absorbent 4 provided between these two sheets, and a liquid-responsive indicator 5 provided between the absorbent 4 and the backsheet 3. It is provided as a structure. The absorbent body 4 consists of an absorbent core 4A made of a water-absorbent material such as pulp or superabsorbent polymer (SAP), and a core wrap sheet 4B made of a hydrophilic sheet such as tissue covering the entire absorbent core 4A. , is composed of
　本実施形態において、インジケータ５は、後述する各成分を含むインジケータ用組成物を溶融して、裏面シート３を形成するシート状基材の肌対向面側の表面に塗布し、さらにそれを冷却して固化させることによって形成されている。なお、本発明において、インジケータの形成手段はこのようなものに限定されず、例えば、インジケータ用組成物を溶融してシート状に成形した後、さらにそのシート状の成形物を吸収体と裏面シートとの間に配置してもよいし、インジケータ用組成物を溶融してシート状基材（例えば、裏面シートを形成するシート状基材とは別のシート状基材等）の表面に塗布し、さらにそれを冷却して固化させることによって形成された積層体を、吸収体と裏面シートとの間に配置してもよい。 In the present embodiment, the indicator 5 is obtained by melting an indicator composition containing each component described later, applying it to the skin-facing surface side of the sheet-like substrate forming the backsheet 3, and then cooling it. It is formed by solidifying with In the present invention, the means for forming the indicator is not limited to the above. For example, after the indicator composition is melted and molded into a sheet, the sheet-shaped molding is further formed into an absorbent body and a back sheet. Alternatively, the indicator composition is melted and applied to the surface of a sheet-like substrate (for example, a sheet-like substrate different from the sheet-like substrate that forms the back sheet). A laminate formed by further cooling and solidifying it may be placed between the absorbent body and the backsheet.
　本発明において、インジケータが配置される位置は、着用者の尿が接触することができ且つ吸収性物品の外表面から視認できる位置であれば特に制限されず、従来の吸収性物品と同様に、所望の視認性等に応じた任意の位置に配置することができる。 In the present invention, the position where the indicator is arranged is not particularly limited as long as it can be contacted by the wearer's urine and visible from the outer surface of the absorbent article. It can be arranged at any position according to desired visibility and the like.
　なお、上述の実施形態においては、インジケータ５は、使い捨ておむつ１の左右方向の略中央部に位置し且つ前面部、中間部及び後面部に沿う方向に延びるように配置されている。本発明において、インジケータの配置位置は特に限定されないが、インジケータは、少なくとも着用者の股下部に対応する中間部から着用者の臀部に対応する後面部に至るまでの広範囲の領域に配置されていることが好ましい。 In the above-described embodiment, the indicator 5 is positioned substantially in the center of the disposable diaper 1 in the left-right direction and is arranged so as to extend along the front, intermediate and rear surfaces. In the present invention, the placement position of the indicator is not particularly limited, but the indicator is placed in a wide range from at least the middle part corresponding to the crotch part of the wearer to the back part corresponding to the buttocks of the wearer. is preferred.
　なお、使い捨ておむつ１の左右方向は、展開状態の使い捨ておむつ１の幅方向に相当し、前面部、中間部及び後面部に沿う方向は、展開状態の使い捨ておむつ１の長手方向に相当する。 The left-right direction of the disposable diaper 1 corresponds to the width direction of the disposable diaper 1 in the unfolded state, and the direction along the front, intermediate and rear portions corresponds to the longitudinal direction of the disposable diaper 1 in the unfolded state.
　そして、上述の実施形態の使い捨ておむつ１に用いられるインジケータ５は、尿と接触する前の初期状態においてアルカリ性側の外観色に調整され、尿に接触すると尿比重に応じた色に変色可能であり、ｐＨ指示薬と、２０質量％以上の、常温で固体の脂肪族アルコールと、１０質量％以上の親水性高分子及び１０質量％以上のアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分と、を含む、特有のインジケータである。 The indicator 5 used in the disposable diaper 1 of the above-described embodiment is adjusted to have an alkaline appearance color in the initial state before coming into contact with urine, and can change color according to urine specific gravity when coming into contact with urine. , a pH indicator, 20% by mass or more of an aliphatic alcohol that is solid at room temperature, 10% by mass or more of a hydrophilic polymer, and 10% by mass or more of an amine-based cationic surfactant. and are specific indicators.
　本実施形態のインジケータ５は、排尿の有無を検知するための変色（すなわち、インジケータ中のｐＨ指示薬の酸性側の色からアルカリ性側の色への変色）とは異なり、尿比重に応じて（すなわち、尿中のＮａ＋やＫ＋、Ｃａ２＋、Ｍｇ２＋等のイオン濃度に応じて）アルカリ性側の外観色から変色するため、使い捨ておむつ１の着用者又はその補助者が尿比重の変化を認識しやすくなっている。 The indicator 5 of the present embodiment differs from the color change for detecting the presence or absence of urination (that is, the color change from the acidic color of the pH indicator in the indicator to the alkaline color), depending on the urine specific gravity (that is, , the concentration of ions such as Na + , K + , Ca 2+ , and Mg 2+ in the urine), so that the wearer of the disposable diaper 1 or an assistant recognizes the change in urine specific gravity. It's getting easier.
　さらに、インジケータ５は、常温（すなわち、２０℃の温度）で固体の脂肪族アルコールを所定量含んでいることで、尿や湿気等の水分に対して溶解しにくく、また、親水性高分子及びアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分を所定量含んでいることで、尿と接触した時の尿比重の変化に対する変色の応答性が高く、尿比重の変化量が小さい場合でも明確に変色することができる。 Furthermore, since the indicator 5 contains a predetermined amount of an aliphatic alcohol that is solid at room temperature (that is, at a temperature of 20° C.), it is difficult to dissolve in moisture such as urine and moisture, and is a hydrophilic polymer and When at least one component among amine-based cationic surfactants is contained in a predetermined amount, the responsiveness of color change to changes in urine specific gravity upon contact with urine is high, and the amount of change in urine specific gravity is small. However, it can be clearly discolored.
　以上より、インジケータ５は、尿や湿気等の水分に対して溶解しにくく且つ尿比重の変化を精度よく検知することができる。 As described above, the indicator 5 is difficult to dissolve in water such as urine and humidity, and can accurately detect changes in urine specific gravity.
　そして、このような特有のインジケータ５を含む使い捨ておむつ１は、着用者の尿比重の変化を精度よく検知することができるため、使い捨ておむつ１の着用者又はその補助者（例えば、乳児の母親や着用者を介護する介護者等）が着用者の尿比重の変化を的確に認識することができる。これにより、インジケータ５を含む使い捨ておむつ１は、幼児等の着用者のトイレトレーニング時期や脱水症状の予兆などをより正確に把握することができる。 Since the disposable diaper 1 including such a unique indicator 5 can accurately detect changes in the urine specific gravity of the wearer, the wearer of the disposable diaper 1 or an assistant (for example, a mother of an infant or Caregivers who care for the wearer, etc.) can accurately recognize changes in the wearer's urine specific gravity. As a result, the disposable diaper 1 including the indicator 5 can more accurately grasp the potty training period of the wearer such as an infant and the signs of dehydration.
　なお、本発明のインジケータを含む吸収性物品において、インジケータ以外の構成部材については、特に制限されず、吸収性物品の種類や用途等に応じた任意の構成部材を用いることができる。 In addition, in the absorbent article including the indicator of the present invention, the constituent members other than the indicator are not particularly limited, and arbitrary constituent members can be used according to the type and application of the absorbent article.
　例えば、上述の使い捨ておむつ１において表面シート２は、使い捨ておむつ１の厚さ方向において肌対向面側の位置に配置されて、着用者の肌に当接し得る接触面、すなわち使い捨ておむつ１の肌対向面側の表面を形成するものであり、不織布等の液透過性のシート状部材によって形成されている。表面シートの外形形状や各種寸法、坪量等は、吸収性物品の表面シートとして用い得るものであれば特に制限されず、所望の液透過性や肌触り、柔軟性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。 For example, in the disposable diaper 1 described above, the topsheet 2 is arranged at a position on the side facing the skin in the thickness direction of the disposable diaper 1, and is a contact surface that can come into contact with the wearer's skin, that is, the surface facing the skin of the disposable diaper 1. It forms the surface on the face side, and is formed of a liquid-permeable sheet-like member such as a nonwoven fabric. The outer shape, various dimensions, basis weight, etc. of the topsheet are not particularly limited as long as they can be used as the topsheet of an absorbent article, and can be arbitrarily selected depending on the desired liquid permeability, touch, flexibility, strength, etc. External shape, various dimensions, basis weight, etc. can be adopted.
　例えば、上述の使い捨ておむつ１において裏面シート３は、使い捨ておむつ１の厚さ方向において非肌対向面側の位置に配置されて、使い捨ておむつ１の非肌対向面側の表面を形成するものであり、使い捨ておむつ１の着用者から排出された尿等の排泄物が使い捨ておむつ１の外部へ漏出するのを防ぎ得る、樹脂フィルムや疎水性不織布等の液不透過性のシート状部材によって形成されている。裏面シートの外形形状や各種寸法、坪量等は、吸収性物品の裏面シートとして用い得るものであれば特に制限されず、所望の防漏性能や通気性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。 For example, in the disposable diaper 1 described above, the backsheet 3 is arranged at a position on the non-skin facing side in the thickness direction of the disposable diaper 1, and forms the surface of the disposable diaper 1 on the non-skin facing side. It is formed of a liquid-impermeable sheet-like member such as a resin film or a hydrophobic nonwoven fabric that can prevent leakage of excrement such as urine excreted by the wearer of the disposable diaper 1 to the outside of the disposable diaper 1. there is The outer shape, various dimensions, basis weight, etc. of the backsheet are not particularly limited as long as it can be used as the backsheet of the absorbent article, and any outer shape according to the desired leakproof performance, breathability, strength, etc. , various dimensions, basis weight, and the like can be adopted.
　例えば、上述の使い捨ておむつ１において吸収体４は、表面シート２と裏面シート３の間に配置されて、表面シート２を透過してきた尿等の排泄物を吸収して保持し得る、所定の吸液性を備えた吸収性部材によって形成されている。 For example, in the disposable diaper 1 described above, the absorber 4 is disposed between the topsheet 2 and the backsheet 3, and is capable of absorbing and retaining excrement such as urine that permeates the topsheet 2. It is formed by an absorbent member having liquid properties.
　吸収体に用い得る吸収性部材は、尿等の排泄物を吸収して保持し得るものであれば特に制限されず、例えば、上述の使い捨ておむつ１においては、吸水性繊維及び高吸収性ポリマーの少なくとも一方を含む吸収性材料からなる吸収コア４Ａと、該吸収コアの外面全体を被覆する少なくとも１枚の液透過性のコアラップシート４Ｂ（例えば、親水性のセルロース系繊維からなるティッシュ等）とによって構成されている。ここで、吸水性繊維としては、例えば、パルプ繊維（例えば、粉砕パルプ等）、コットン、レーヨン、アセテート等のセルロース系繊維などを用いることができる。また、高吸収性ポリマーとしては、例えば、デンプン系の高吸収性ポリマー；アクリル酸ナトリウムコポリマー等の合成ポリマー系の高吸収性ポリマー（いわゆる「ＳＡＰ」）などの粒状物を用いることができる。 The absorbent member that can be used for the absorbent body is not particularly limited as long as it can absorb and retain excrement such as urine. An absorbent core 4A made of an absorbent material containing at least one, and at least one liquid-permeable core wrap sheet 4B covering the entire outer surface of the absorbent core (for example, tissue or the like made of hydrophilic cellulosic fibers) It is composed by Here, as the water-absorbing fibers, for example, pulp fibers (for example, pulverized pulp), cotton, rayon, cellulosic fibers such as acetate, and the like can be used. Further, as the superabsorbent polymer, for example, starch-based superabsorbent polymers; granular materials such as synthetic polymer-based superabsorbent polymers (so-called “SAP”) such as sodium acrylate copolymers can be used.
　なお、吸収体の外形形状や各種寸法、坪量等は、吸収性物品の吸収体として用い得るものであれば特に制限されず、所望の吸水性や柔軟性、強度等に応じた任意の外形形状や各種寸法、坪量等を採用することができる。 In addition, the outer shape, various dimensions, basis weight, etc. of the absorbent are not particularly limited as long as they can be used as the absorbent of the absorbent article, and any outer shape according to the desired water absorption, flexibility, strength, etc. A shape, various dimensions, basis weight, etc. can be adopted.
　本発明のインジケータが適用される吸収性物品は、少なくとも尿を吸収対象とする吸収性物品であれば特に限定されず、上述の実施形態のパンツ型の使い捨ておむつのほか、例えば、テープ型の使い捨ておむつや失禁パッド等の様々な吸収性物品に適用することができる。 The absorbent article to which the indicator of the present invention is applied is not particularly limited as long as it is an absorbent article that absorbs at least urine. It can be applied to various absorbent articles such as diapers and incontinence pads.
　例えば、本発明のインジケータが、乳幼児のトイレトレーニング用の使い捨ておむつに適用された場合、乳幼児から排出される尿の比重の変化を適切に可視化することで、乳幼児の体がトイレトレーニングの準備が整っているかどうかを推定することができるという利点がある。また、本発明のインジケータが、大人用の使い捨ておむつに適用された場合、被介護者等の大人の着用者から排出される尿の比重の変化を適切に可視化することで、脱水症状の予兆などを検知することができるという利点がある。 For example, when the indicator of the present invention is applied to disposable diapers for toilet training of infants, by appropriately visualizing changes in the specific gravity of urine excreted from the infant, the infant's body is ready for potty training. It has the advantage of being able to estimate whether or not In addition, when the indicator of the present invention is applied to disposable diapers for adults, by appropriately visualizing changes in the specific gravity of urine excreted from adult wearers such as care recipients, it is possible to predict dehydration symptoms. has the advantage of being able to detect
　以下、本発明のインジケータについて、上述の実施形態のインジケータ５を用いて更に詳細に説明する。 The indicator of the present invention will be described in more detail below using the indicator 5 of the above-described embodiment.
［インジケータ］
　本発明の一実施形態であるインジケータ５は、上述のとおり、尿と接触する前の初期状態においてアルカリ性側の外観色に調整され、尿に接触すると尿比重に応じた色に変色可能であり、ｐＨ指示薬と、２０質量％以上の、常温で固体の脂肪族アルコールと、１０質量％以上の親水性高分子及び１０質量％以上のアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分と、を含むものである。 [indicator]
As described above, the indicator 5, which is an embodiment of the present invention, is adjusted to an alkaline appearance color in the initial state before contact with urine, and can change color according to the urine specific gravity when it contacts urine. A pH indicator, 20% by mass or more of an aliphatic alcohol that is solid at room temperature, 10% by mass or more of a hydrophilic polymer, and 10% by mass or more of an amine-based cationic surfactant. , is included.
　インジケータ５は、尿と接触する前の初期状態においてアルカリ性側の外観色に調整されているが、使い捨ておむつ１の着用者から排出される尿に接触すると、酸性側の外観色に変色する。このとき、インジケータ５は、その尿の比重の値に応じて異なる色調に呈色する。 In the initial state before contact with urine, the indicator 5 is adjusted to have an alkaline exterior color, but when it comes into contact with urine excreted from the wearer of the disposable diaper 1, the indicator 5 changes color to an acidic exterior color. At this time, the indicator 5 changes color tones depending on the value of the specific gravity of the urine.
　なお、インジケータの呈色の度合いは、肉眼で判定してもよく、又は光学的に測定した反射率等で判定してもよい。肉眼で呈色の度合いを判定する場合は、例えば、インジケータの色調と、予め作成した標準色調表（すなわち、色見本）などの色調とを、肉眼で比較することによって判定することができる。また、光学的測定で呈色の度合いを判定する場合は、例えば、デジタルカメラやスマートフォン等の撮影手段によって撮影したインジケータの画像を、任意のコンピューターやスマートフォン等にインストールされた画像処理プログラムで処理することによって判定することができる。 It should be noted that the degree of coloration of the indicator may be determined by the naked eye, or may be determined by optically measured reflectance or the like. When determining the degree of coloration with the naked eye, for example, the color tone of the indicator can be determined by comparing the color tone of a standard color tone table (that is, a color sample) prepared in advance with the naked eye. In addition, when determining the degree of coloration by optical measurement, for example, an image of the indicator taken by a photographing means such as a digital camera or a smartphone is processed with an image processing program installed on any computer or smartphone. can be determined by
　インジケータの色調に関し、アルカリ性側及び酸性側の外観色は、尿の接触による呈色前後の相対的なｐＨの関係によって定まるものであり、それぞれの外観色の色調は、インジケータに含まれるｐＨ指示薬の種類によって異なる。例えば、ｐＨ指示薬としてブロモチモールブルーを用いた場合、アルカリ性側の外観色は紫色、青色又は青緑色となり、酸性側の外観色は黄緑色、黄色又は橙色となる。本発明のインジケータは、従来の排尿の有無を検知するための変色（すなわち、インジケータ中のｐＨ指示薬の酸性側の色からアルカリ性側の色への変色）とは異なり、尿比重に応じてアルカリ性側の外観色から酸性側の外観色へ変色するため、使い捨ておむつ等の吸収性物品に適用したときに、吸収性物品の着用者又はその補助者が尿比重の変化を認識しやすくなる。 Regarding the color tone of the indicator, the appearance colors on the alkaline side and the acidic side are determined by the relative pH relationship before and after coloration due to contact with urine. Varies by type. For example, when bromothymol blue is used as the pH indicator, the appearance color on the alkaline side is purple, blue or bluish green, and the appearance color on the acidic side is yellowish green, yellow or orange. Unlike the conventional color change for detecting the presence or absence of urination (that is, the color change of the pH indicator in the indicator from the acidic color to the alkaline color), the indicator of the present invention can Therefore, when applied to an absorbent article such as a disposable diaper, the wearer of the absorbent article or a person assisting the absorbent article can easily recognize the change in the urine specific gravity.
　なお、本発明のインジケータは、低比重の尿に接触すると青色又は緑色に変色し、高比重の尿に接触すると黄色又は橙色に変色するものが好ましい。このようなインジケータは、排尿の有無を検知するための変色、すなわちインジケータ中のｐＨ指示薬の酸性側の色からアルカリ性側の色への変色とは異なり、低比重の尿に接触すると青色又は緑色に変色し、高比重の尿に接触すると黄色又は橙色に変色するので、吸収性物品に適用したときに、吸収性物品の着用者又はその補助者が尿比重の変化を認識しやすく、特に、尿と接触する前の初期状態の色から高比重の尿に接触した時の黄色又は橙色への変色がより視認しやすくなる。これにより、このようなインジケータは、尿比重の変化をより精度よく、より容易に検知することができる。 It should be noted that the indicator of the present invention preferably changes color to blue or green when it comes into contact with low specific gravity urine, and changes color to yellow or orange when it comes into contact with high specific gravity urine. Such an indicator turns blue or green when it comes into contact with low specific gravity urine, unlike the color change for detecting the presence or absence of urination, that is, the color change of the pH indicator in the indicator from the acidic color to the alkaline color. When the absorbent article is applied to the absorbent article, the wearer of the absorbent article or its assistant can easily recognize the change in the urine specific gravity. The change in color from the initial color before contact with urine to yellow or orange when it comes into contact with urine having a high specific gravity becomes more visible. This allows such an indicator to more accurately and easily detect changes in urine specific gravity.
　ここで、尿と接触する前の初期状態のインジケータをアルカリ性側の外観色に調整する手段は、特に限定されないが、例えば、インジケータに含まれるｐＨ指示薬をアルカリ性側の色調に呈色し得るアルカリ化剤（例えば、塩基、塩類、緩衝剤等の一部のｐＨ調整剤など）を含有させることなどが挙げられる。 Here, the means for adjusting the color of the indicator in the initial state before it comes into contact with urine to an alkaline appearance is not particularly limited. agents (for example, some pH adjusters such as bases, salts, buffers, etc.).
（ｐＨ指示薬）
　本発明の一実施形態であるインジケータ５は、ｐＨ指示薬を必須成分として含んでいる。ｐＨ指示薬としては、吸収性物品のインジケータに用い得るものであれば特に限定されないが、イオン強度の増大により解離が促進されるｐＨ指示薬が好ましい。そのようなｐＨ指示薬の具体的な例としては、ブロモチモールブルー（ＢＴＢ）、ゲンチアナバイオレット、ブロモクレゾールパープル、マラカイトグリーン、チモールブルー、メチルイエロー、ブロモフェノールブルー、コンゴーレッド、メチルオレンジ、リトマス、フェノールレッド、クロロフェノールレッド、ニュートラルレッド、ブロモクレゾールグリーン、メチルレッド、ナフトールフタレイン、クレゾールレッド、クレゾールフタレイン、フェノールフタレイン、チモールフタレイン、及びアリザリンイエローＲなどを挙げることができる。これらのｐＨ指示薬は、１種類のｐＨ指示薬を単独で用いてもよく、２種類以上のｐＨ指示薬を併用してもよい。 (pH indicator)
The indicator 5, which is one embodiment of the present invention, contains a pH indicator as an essential component. The pH indicator is not particularly limited as long as it can be used as an indicator for absorbent articles, but a pH indicator whose dissociation is promoted by an increase in ionic strength is preferred. Specific examples of such pH indicators include bromothymol blue (BTB), gentian violet, bromocresol purple, malachite green, thymol blue, methyl yellow, bromophenol blue, congo red, methyl orange, litmus, phenol red. , chlorophenol red, neutral red, bromocresol green, methyl red, naphtholphthalein, cresol red, cresolphthalein, phenolphthalein, thymolphthalein, and alizarin yellow R. One pH indicator may be used alone, or two or more pH indicators may be used in combination.
　好ましいｐＨ指示薬としては、ブロモチモールブルー（ＢＴＢ）、ブロモクレゾールパープル、チモールブルー、フェノールレッド、クロロフェノールレッド、ブロモクレゾールグリーン及びメチルレッドなどが挙げられる。これらのｐＨ指示薬は、イオン強度の増強で解離が促進されるため好ましい。 Preferable pH indicators include bromothymol blue (BTB), bromocresol purple, thymol blue, phenol red, chlorophenol red, bromocresol green and methyl red. These pH indicators are preferred because increased ionic strength promotes dissociation.
　本発明のインジケータにおいては、ｐＨ指示薬として２種類以上のｐＨ指示薬を含むことが好ましい。２種類以上のｐＨ指示薬を組み合わせて用いることで、より小さい比重差の尿に対しても明確に変色することができるので、尿比重の変化をより精度よく、より確実に検知することができる。また、変色域の異なる２種類以上のｐＨ指示薬を組み合わせることで、尿比重の検出範囲を広げることができ、尿比重の変化による色の変色度合いを増加させて、視認しやすくすることができる。 The indicator of the present invention preferably contains two or more types of pH indicators as pH indicators. By using a combination of two or more types of pH indicators, even urine with a smaller specific gravity difference can be clearly discolored, so changes in urine specific gravity can be detected more accurately and reliably. In addition, by combining two or more types of pH indicators with different color change ranges, it is possible to widen the detection range of urine specific gravity, increase the degree of color change due to changes in urine specific gravity, and make it easier to see.
　ｐＨ指示薬として２種類以上のｐＨ指示薬を併用する場合は、ブロモチモールブルーと他のｐＨ指示薬との組み合わせが好ましい。ｐＨ指示薬としてこのような組み合わせを用いると、呈色する際の色調変化を大きくすることができる上、変色域も拡張することができるという利点がある。なお、ブロモチモールブルーと併用し得る他のｐＨ指示薬としては、例えば、チモールブルー、フェノールレッド及びメチルレッドなどが挙げられる。これらのｐＨ指示薬の中でも、メチルレッドを用いることが好ましい。ブロモチモールブルーとメチルレッドの組み合わせは、安定的かつ広範囲の変色（呈色反応）を実現することができる。 When two or more types of pH indicators are used together as pH indicators, a combination of bromothymol blue and other pH indicators is preferable. When such a combination is used as a pH indicator, there is an advantage that the change in color tone can be increased and the color change range can be expanded. Other pH indicators that can be used in combination with bromothymol blue include, for example, thymol blue, phenol red and methyl red. Among these pH indicators, it is preferable to use methyl red. A combination of bromothymol blue and methyl red can realize a stable and wide-ranging color change (color reaction).
　インジケータに含まれるｐＨ指示薬の含有量は、特に限定されず、呈色反応の応答性や視認性などを考慮して適宜設定することができる。そのような含有量としては、インジケータ用組成物の全質量（１００質量％）に対して、例えば、０．０１質量％～１０．０質量％であり、好ましくは０．０１質量％～５．０質量％であり、より好ましくは０．０５質量％～４．０質量％である。ｐＨ指示薬の含有量がこのような範囲内であると、インジケータの応答（呈色）の良好な視認性を確保することができる。 The content of the pH indicator contained in the indicator is not particularly limited, and can be appropriately set in consideration of the responsiveness and visibility of the color reaction. Such a content is, for example, 0.01% by mass to 10.0% by mass, preferably 0.01% by mass to 5.0% by mass, relative to the total mass (100% by mass) of the indicator composition. It is 0 mass %, more preferably 0.05 mass % to 4.0 mass %. When the content of the pH indicator is within such a range, good visibility of the response (coloring) of the indicator can be ensured.
（脂肪族アルコール）
　本発明の一実施形態であるインジケータ５は、インジケータ５の全質量（１００質量％）に対して２０質量％以上の含有量の、常温（２０℃）で固体の脂肪族アルコールを必須成分として含んでいる。このような特定の脂肪族アルコールを含んでいることで、インジケータ５は、尿や湿気等の水分に対して溶解しにくくなっている。 (fatty alcohol)
The indicator 5, which is one embodiment of the present invention, contains as an essential component an aliphatic alcohol that is solid at normal temperature (20 ° C.) with a content of 20% by mass or more relative to the total mass (100% by mass) of the indicator 5. I'm in. Containing such a specific aliphatic alcohol makes the indicator 5 less soluble in moisture such as urine and humidity.
　本発明のインジケータに用い得る脂肪族アルコールとしては、常温で固体であり、吸収性物品のインジケータに用い得るものであれば特に限定されず、例えば、炭素数が８～３４個（Ｃ８～Ｃ３４）の脂肪族アルコールなどが挙げられる。脂肪族アルコールは、１種類の脂肪族アルコールを単独で用いてもよく、２種類以上の脂肪族アルコールを併用してもよい。 The aliphatic alcohol that can be used for the indicator of the present invention is not particularly limited as long as it is solid at room temperature and can be used as an indicator for absorbent articles, for example, has 8 to 34 carbon atoms (C8 to C34). and fatty alcohols such as As for the fatty alcohol, one type of fatty alcohol may be used alone, or two or more types of fatty alcohol may be used in combination.
　好ましい脂肪族アルコールとしては、４０℃より高く１１０℃以下の融点を有する脂肪族アルコールが挙げられ、具体的な例としては、１－ヘキサデカノール、１－オクタデカノール、１－エイコサノール、１－ドコサノール、１－テトラコサノール、１－ヘキサコサノール、１－オクタコサノール、１，１２－ドデカンジオールなどが挙げられる。インジケータに含まれる脂肪族アルコールがこのような特定の融点を有するものであると、インジケータ用組成物を溶融状態で不織布やフィルム等の基材に塗工した時に、冷却固化が進行し、インジケータを基材上の的確な位置に均一に形成することができる。これにより、上記特定の脂肪族アルコールを含むインジケータは、尿中のナトリウムイオン（Ｎａ＋）やカリウムイオン（Ｋ＋）、カルシウムイオン（Ｃａ２＋）、マグネシウムイオン（Ｍｇ２＋）と接触した際に素早く変色することができる上、色の変化が小さい場合でも、変色が視認しやすくなるため、尿比重の変化をより精度よく、より確実に検知することができる。 Preferred fatty alcohols include fatty alcohols having a melting point higher than 40° C. and lower than or equal to 110° C. Specific examples include 1-hexadecanol, 1-octadecanol, 1-eicosanol, 1- docosanol, 1-tetracosanol, 1-hexacosanol, 1-octacosanol, 1,12-dodecanediol and the like. When the aliphatic alcohol contained in the indicator has such a specific melting point, when the indicator composition is applied in a molten state to a base material such as a nonwoven fabric or a film, cooling and solidification proceeds, and the indicator is removed. It can be uniformly formed at a precise position on the substrate. As a result, the indicator containing the above-mentioned specific fatty alcohol can be quickly dissolved when it comes into contact with sodium ions (Na + ), potassium ions (K + ), calcium ions (Ca 2+ ), and magnesium ions (Mg 2+ ) in urine. In addition to being able to change color, even if the change in color is small, the change in color can be easily visually recognized, so changes in urine specific gravity can be detected more accurately and reliably.
　インジケータに含まれる脂肪族アルコールの含有量としては、インジケータの全質量（１００質量％）に対して２０質量％以上であれば特に限定されず、尿や湿気等の水分に対する溶解のしにくさや視認性などを考慮して適宜設定することができる。そのような含有量としては、インジケータ用組成物の全質量（１００質量％）に対して、例えば、２０質量％～８０質量％であり、好ましくは３０質量％～６０質量％である。 The content of the aliphatic alcohol contained in the indicator is not particularly limited as long as it is 20% by mass or more with respect to the total mass (100% by mass) of the indicator, and it is difficult to dissolve in water such as urine and moisture and visible It can be appropriately set in consideration of the nature and the like. Such a content is, for example, 20% by mass to 80% by mass, preferably 30% by mass to 60% by mass, relative to the total mass (100% by mass) of the indicator composition.
（親水性高分子）
　本発明の一実施形態であるインジケータ５は、１０質量％以上の親水性高分子及び１０質量％以上のアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分を、必須成分として含んでいる。このような成分を所定量含んでいることで、インジケータ５は、尿と接触した時の尿比重の変化に対する変色の応答性が高くなり、尿比重の変化量が小さい場合でも明確に変色することができる。 (hydrophilic polymer)
The indicator 5, which is one embodiment of the present invention, contains at least one component of a hydrophilic polymer of 10% by mass or more and an amine-based cationic surfactant of 10% by mass or more as an essential component. . By containing a predetermined amount of such a component, the indicator 5 becomes highly responsive in changing color to changes in urine specific gravity upon contact with urine, and even when the amount of change in urine specific gravity is small, the indicator 5 clearly changes color. can be done.
　本発明のインジケータに用い得る親水性高分子としては、親水性を有する高分子であれば特に限定されず、例えば、ポリアミド、セルロース系ポリマー（例えば、セルロース、セルロース誘導体等）、アクリル系ポリマー（例えば、ポリアクリル酸、ポリアクリルアミド、無水マレイン酸ポリマー等）、ポリオール（例えば、ポリエチレングリコール等）、ポリビニルピロリドン、ポリビニルアルコール、ポリアリルアミン、ポリエチレンイミン、オキサゾリン系ポリマー（例えば、ポリ（２－オキサゾリン）、ポリ（２－エチル－２－オキサゾリン）、ポリ（２－メチル－２－オキサゾリン）等）などが挙げられる。親水性高分子は、１種類の親水性高分子を単独で用いてもよく、２種類以上の親水性高分子を併用してもよい。 The hydrophilic polymer that can be used in the indicator of the present invention is not particularly limited as long as it is a polymer having hydrophilicity. , polyacrylic acid, polyacrylamide, maleic anhydride polymer, etc.), polyol (e.g., polyethylene glycol, etc.), polyvinylpyrrolidone, polyvinyl alcohol, polyallylamine, polyethyleneimine, oxazoline-based polymer (e.g., poly (2-oxazoline), poly (2-ethyl-2-oxazoline), poly(2-methyl-2-oxazoline), etc.). As the hydrophilic polymer, one kind of hydrophilic polymer may be used alone, or two or more kinds of hydrophilic polymers may be used in combination.
　なお、本明細書においては、親水性高分子と後述する糖アルコール成分の糖アルコールの重合体とを区別するため、親水性高分子は糖アルコールの重合体を除くものとする。 In this specification, in order to distinguish between the hydrophilic polymer and the sugar alcohol polymer of the sugar alcohol component described later, the hydrophilic polymer excludes the sugar alcohol polymer.
　本発明のインジケータにおいては、親水性高分子としてポリアミドを含むことが好ましい。インジケータが親水性高分子としてポリアミドを含んでいると、ｐＨ指示薬の形態変化に作用し、尿比重の変色範囲が広くなる上、溶解作用が強く、応答速度が速くなる。これにより、親水性高分子としてポリアミドを含むインジケータは、幅広い尿比重の変化に対しても精度よく検知することができる。なお、ポリアミドは、軟化点が１４０℃以下のものが好適である。 The indicator of the present invention preferably contains polyamide as the hydrophilic polymer. When the indicator contains polyamide as a hydrophilic polymer, it acts on the shape change of the pH indicator, widens the color change range of the urine specific gravity, and has a strong dissolving action and a fast response speed. As a result, the indicator containing polyamide as the hydrophilic polymer can accurately detect a wide range of changes in urine specific gravity. The polyamide preferably has a softening point of 140° C. or lower.
　インジケータに含まれる親水性高分子の含有量としては、インジケータの全質量（１００質量％）に対して１０質量％以上であれば特に限定されず、呈色反応の応答性や視認性などを考慮して適宜設定することができる。そのような含有量としては、インジケータ用組成物の全質量（１００質量％）に対して、例えば、１０質量％～４０質量％であり、好ましくは１５質量％～３０質量％である。 The content of the hydrophilic polymer contained in the indicator is not particularly limited as long as it is 10% by mass or more with respect to the total mass (100% by mass) of the indicator, and the responsiveness of the color reaction and visibility are taken into consideration. can be set as appropriate. Such a content is, for example, 10% by mass to 40% by mass, preferably 15% by mass to 30% by mass, relative to the total mass (100% by mass) of the indicator composition.
（アミン系の陽イオン界面活性剤）
　本発明のインジケータに用い得るアミン系の陽イオン界面活性剤としては、陽イオン性の親水基を有するアミン系の界面活性剤であれば特に限定されず、例えば、第４級アンモニウム塩型の陽イオン界面活性剤やアルキルアミン塩型の界面活性剤、ピリジン環を有する陽イオン界面活性剤などが挙げられる。 (Amine-based cationic surfactant)
The amine-based cationic surfactant that can be used in the indicator of the present invention is not particularly limited as long as it is an amine-based surfactant having a cationic hydrophilic group. Examples thereof include ionic surfactants, alkylamine salt-type surfactants, and cationic surfactants having a pyridine ring.
　第４級アンモニウム塩型の陽イオン界面活性剤の具体的な例としては、塩化テトラメチルアンモニウム、水酸化テトラメチルアンモニウム、塩化テトラブチルアンモニウム、塩化ドデシルジメチルベンジルアンモニウム、塩化アルキルトリメチルアンモニウム、塩化オクチルトリメチルアンモニウム、塩化デシルトリメチルアンモニウム、塩化ドデシルトリメチルアンモニウム、塩化テトラデシルトリメチルアンモニウム、塩化セチルトリメチルアンモニウム、塩化ステアリルトリメチルアンモニウム、臭化アルキルトリメチルアンモニウム、臭化ヘキサデシルトリメチルアンモニウム、塩化ベンジルトリメチルアンモニウム、塩化ベンジルトリエチルアンモニウム、塩化ベンザルコニウム、臭化ベンザルコニウム、塩化ベンゼトニウム、塩化ジアルキルジメチルアンモニウム、塩化ジデシルジメチルアンモニウム及び塩化ジステアリルジメチルアンモニウムなどが挙げられる。 Specific examples of quaternary ammonium salt-type cationic surfactants include tetramethylammonium chloride, tetramethylammonium hydroxide, tetrabutylammonium chloride, dodecyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, and octyltrimethyl chloride. ammonium, decyltrimethylammonium chloride, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, benzyltrimethylammonium chloride, benzyltriethylammonium chloride , benzalkonium chloride, benzalkonium bromide, benzethonium chloride, dialkyldimethylammonium chloride, didecyldimethylammonium chloride and distearyldimethylammonium chloride.
　アルキルアミン塩型の陽イオン界面活性剤の具体的な例としては、モノメチルアミン塩酸塩、ジメチルアミン塩酸塩及びトリメチルアミン塩酸塩などが挙げられる。 Specific examples of alkylamine salt-type cationic surfactants include monomethylamine hydrochloride, dimethylamine hydrochloride and trimethylamine hydrochloride.
　ピリジン環を有する陽イオン界面活性剤の具体的な例としては、例えば、塩化ブチルピリジニウム、塩化ドデシルピリジニウム及び塩化セチルピリジニウムなどが挙げられる。 Specific examples of cationic surfactants having a pyridine ring include butylpyridinium chloride, dodecylpyridinium chloride and cetylpyridinium chloride.
　なお、上記の陽イオン界面活性剤は、１種類の陽イオン界面活性剤を単独で用いてもよく、２種類以上の陽イオン界面活性剤を併用してもよい。 As for the above cationic surfactants, one type of cationic surfactant may be used alone, or two or more types of cationic surfactants may be used in combination.
　本発明のインジケータにおいては、アミン系の陽イオン界面活性剤として第４級アンモニウム塩を含むものが好ましい。アミン系の陽イオン界面活性剤が第４級アンモニウム塩を含むものであると、界面活性能が高く、インジケータが尿と接触した時の変色速度がより速くなる。これにより、陽イオン界面活性剤として第４級アンモニウム塩を含むインジケータは、尿比重の変化をより精度よく検知することができる。 The indicator of the present invention preferably contains a quaternary ammonium salt as an amine-based cationic surfactant. When the amine-based cationic surfactant contains a quaternary ammonium salt, it has a high surface activity, and the color change rate of the indicator becomes faster when it comes into contact with urine. As a result, the indicator containing the quaternary ammonium salt as the cationic surfactant can more accurately detect changes in urine specific gravity.
　インジケータに含まれる陽イオン界面活性剤の含有量としては、インジケータの全質量（１００質量％）に対して１０質量％以上であれば特に限定されず、呈色反応の応答性や視認性などを考慮して適宜設定することができる。そのような含有量としては、インジケータ用組成物の全質量（１００質量％）に対して、例えば、１０質量％～４０質量％であり、好ましくは１５質量％～３０質量％である。 The content of the cationic surfactant contained in the indicator is not particularly limited as long as it is 10% by mass or more with respect to the total mass (100% by mass) of the indicator, and the responsiveness and visibility of the color reaction are improved. It can be set as appropriate in consideration of this. Such a content is, for example, 10% by mass to 40% by mass, preferably 15% by mass to 30% by mass, relative to the total mass (100% by mass) of the indicator composition.
（糖アルコール成分）
　本発明の一実施形態であるインジケータ５は、糖アルコール成分を任意成分として更に含んでいる。この実施形態のように、本発明のインジケータは、糖アルコール成分として、糖アルコール及び糖アルコールの重合体のうちの少なくとも一つの成分を、２．５質量％以上の配合割合で更に含んでいることが好ましい。糖アルコール成分は、本発明のインジケータにおいては必須成分ではないものの、インジケータがこのような糖アルコール成分を含んでいると、親水性が高まり、尿と接触したときの変色速度を高くすることができる。 (sugar alcohol component)
Indicator 5 which is one embodiment of the present invention further contains a sugar alcohol component as an optional component. As in this embodiment, the indicator of the present invention further contains, as a sugar alcohol component, at least one of sugar alcohols and sugar alcohol polymers at a compounding ratio of 2.5% by mass or more. is preferred. Although the sugar alcohol component is not an essential component in the indicator of the present invention, if the indicator contains such a sugar alcohol component, the hydrophilicity of the indicator increases, and the rate of discoloration upon contact with urine can be increased. .
　本発明のインジケータに用い得る糖アルコール成分としては、糖アルコール及びその重合体が挙げられ、具体的には、グリセリン、エリトリトール、Ｄ－トレイトール、Ｌ－トレイトール、Ｄ－アラビニトール、Ｌ－アラビニトール、キシリトール、リビトール、Ｄ－イジトール、ガラクチトール、マンニトール、ボレミトール、ペルセイトールなどの糖アルコール、及びこれら糖アルコールの重合体などが挙げられる。好ましい糖アルコール成分としては、グリセリン、及びその重合体であるポリグリセリンが挙げられる。なお、これらの糖アルコール成分は、１種類の糖アルコール成分を単独で用いてもよく、２種類以上の糖アルコール成分を併用してもよい。 Sugar alcohol components that can be used in the indicator of the present invention include sugar alcohols and polymers thereof, specifically glycerin, erythritol, D-threitol, L-threitol, D-arabinitol, L-arabinitol, Examples thereof include sugar alcohols such as xylitol, ribitol, D-iditol, galactitol, mannitol, boremitol and perseitol, and polymers of these sugar alcohols. Preferred sugar alcohol components include glycerin and its polymer polyglycerin. In addition, these sugar-alcohol components may be used individually by one type of sugar-alcohol component, and may use two or more types of sugar-alcohol components together.
　インジケータに含まれる糖アルコール成分の含有量としては、インジケータの全質量（１００質量％）に対して２．５質量％以上であれば特に限定されず、呈色反応の応答性や視認性などを考慮して適宜設定することができる。そのような含有量としては、インジケータ用組成物の全質量（１００質量％）に対して、例えば、２．５質量％～２０質量％であり、好ましくは３．０質量％～１５．０質量％である。 The content of the sugar alcohol component contained in the indicator is not particularly limited as long as it is 2.5% by mass or more relative to the total mass (100% by mass) of the indicator. It can be set as appropriate in consideration of this. Such a content is, for example, 2.5% by mass to 20% by mass, preferably 3.0% by mass to 15.0% by mass, relative to the total mass (100% by mass) of the indicator composition. %.
（疎水性成分）
　本発明の一実施形態であるインジケータ５は、ワックスやオイル、粘着付与樹脂などの疎水性成分を、可塑剤や粘着付与剤として更に含んでいる。この実施形態のように、本発明のインジケータは、疎水性成分として、ワックス、オイル及び粘着付与樹脂のうちの少なくとも一つの成分を更に含んでいることが好ましい。疎水性成分は、本発明のインジケータにおいては必須成分ではないものの、インジケータがこのような疎水性成分を含んでいると、インジケータ用組成物を不織布やフィルム等の基材に塗布する際に、基材への定着性が高くなり、インジケータを基材上の所定の位置に的確に形成することができる。これにより、このような疎水性成分を含むインジケータは、尿比重の変化をより精度よく、より確実に検知することができる。 (Hydrophobic component)
The indicator 5, which is one embodiment of the present invention, further contains hydrophobic components such as waxes, oils, and tackifier resins as plasticizers and tackifiers. As in this embodiment, the indicator of the present invention preferably further comprises at least one of waxes, oils and tackifying resins as a hydrophobic component. The hydrophobic component is not an essential component in the indicator of the present invention. The fixability to the material is improved, and the indicator can be accurately formed at a predetermined position on the base material. As a result, an indicator containing such a hydrophobic component can more accurately and reliably detect changes in urine specific gravity.
　本発明のインジケータに用い得るワックスとしては、可塑剤として作用し得るものであれば特に限定されず、例えば、公知の天然ワックスや合成ワックスなどが挙げられる。天然ワックスの具体的な例としては、パラフィンや微結晶ワックス（マイクロクリスタリンワックス）等の石油由来ワックス；蜜蝋や鯨蝋等の動物由来ワックス；カルナバ蝋等の植物由来ワックス；モンタンワックスやオゾケライト等の鉱物由来ワックスなどが挙げられる。合成ワックスの具体的な例としては、ポリエチレンワックス、フィッシャー・トロプシュワックス、脂肪酸アミドなどが挙げられる。好ましいワックスとしては、パラフィンや微結晶ワックス等の石油由来ワックスが挙げられる。 The wax that can be used for the indicator of the present invention is not particularly limited as long as it can act as a plasticizer, and examples include known natural waxes and synthetic waxes. Specific examples of natural waxes include petroleum-derived waxes such as paraffin and microcrystalline wax (microcrystalline wax); animal-derived waxes such as beeswax and spermaceti; plant-derived waxes such as carnauba wax; and waxes derived from minerals. Specific examples of synthetic waxes include polyethylene waxes, Fischer-Tropsch waxes, fatty acid amides, and the like. Preferred waxes include petroleum-derived waxes such as paraffin and microcrystalline waxes.
　本発明のインジケータに用い得るオイルとしては、可塑剤として作用し得るものであれば特に限定されず、例えば、公知のパラフィン系オイルやナフテン系オイル、芳香族系オイルなどが挙げられる。好ましいオイルとしては、ナフテン系オイルが挙げられる。 The oil that can be used in the indicator of the present invention is not particularly limited as long as it can act as a plasticizer, and examples include known paraffinic oils, naphthenic oils, and aromatic oils. Preferred oils include naphthenic oils.
　本発明のインジケータに用い得る粘着付与樹脂としては、粘着付与剤として作用し得るものであれば特に限定されず、例えば、公知の天然樹脂や石油系樹脂などが挙げられる。天然樹脂の具体的な例としては、ロジン及びロジン誘導体、テルペン及び変性テルペン等の植物由来樹脂などが挙げられる。石油系樹脂の具体的な例としては、Ｃ５～Ｃ９の脂肪族又は芳香族樹脂、Ｃ５～Ｃ９の脂肪族及び芳香族共重合樹脂などが挙げられる。 The tackifying resin that can be used in the indicator of the present invention is not particularly limited as long as it can act as a tackifier, and examples include known natural resins and petroleum-based resins. Specific examples of natural resins include plant-derived resins such as rosin and rosin derivatives, terpenes and modified terpenes. Specific examples of petroleum-based resins include C5-C9 aliphatic or aromatic resins, C5-C9 aliphatic and aromatic copolymer resins, and the like.
　なお、以上の疎水性成分は、１種類の疎水性成分を単独で用いてもよく、２種類以上の疎水性成分を併用してもよい。 As for the above hydrophobic components, one type of hydrophobic component may be used alone, or two or more types of hydrophobic components may be used in combination.
　インジケータに含まれる疎水性成分の含有量としては、本発明の効果を阻害しない限り特に限定されないが、例えば、インジケータの全質量（１００質量％）に対して、０．１質量％～３０．０質量％であり、好ましくは１．０質量％～２０．０質量％である。 The content of the hydrophobic component contained in the indicator is not particularly limited as long as it does not impede the effects of the present invention. % by mass, preferably 1.0% by mass to 20.0% by mass.
（アルカリ化剤）
　本発明の一実施形態であるインジケータ５は、アルカリ化剤を任意成分として更に含んでいる。このようなアルカリ化剤を含んでいることで、インジケータ５は、尿の接触による呈色前後の色調のムラが生じにくく、変色をより視認しやすくなっている。 (Alkalizing agent)
Indicator 5 which is one embodiment of the present invention further contains an alkalizing agent as an optional component. By containing such an alkalizing agent, the indicator 5 is less likely to have unevenness in color tone before and after coloration due to contact with urine, making it easier to visually recognize discoloration.
　なお、インジケータ５においては、アルカリ化剤は、尿と接触する前の初期状態のインジケータ５をアルカリ性側の外観色に調整する手段としても用いられている。 In addition, in the indicator 5, the alkalinizing agent is also used as a means for adjusting the appearance color of the indicator 5 in the initial state before coming into contact with urine to the alkaline side.
　本発明のインジケータに用い得るアルカリ化剤としては、特に限定されないが、例えば、公知の炭酸ナトリウム（Ｎａ２ＣＯ３）、水酸化ナトリウム（ＮａＯＨ）、炭酸カリウム（Ｋ２ＣＯ３）などが挙げられる。 The alkalizing agent that can be used in the indicator of the present invention is not particularly limited, and examples thereof include known sodium carbonate (Na 2 CO 3 ), sodium hydroxide (NaOH), potassium carbonate (K 2 CO 3 ), and the like. .
　本発明のインジケータにおいては、アルカリ化剤として炭酸ナトリウムを更に含んでいることが好ましい。炭酸ナトリウムは、水酸化ナトリウムや炭酸カリウム等の他のアルカリ化剤と比べて、インジケータ中の他の成分と均一に混ざりやすいため、変色のムラや変色の異常が生じにくく、また、色の変化が小さい場合でも、変色が視認しやすくなる。これにより、アルカリ化剤として炭酸ナトリウムを含むインジケータは、尿比重の変化をより精度よく、より確実に検知することができる。 The indicator of the present invention preferably further contains sodium carbonate as an alkalinizing agent. Compared to other alkalinizing agents such as sodium hydroxide and potassium carbonate, sodium carbonate mixes more uniformly with other components in the indicator, so it is less likely that uneven discoloration or abnormal discoloration will occur. Even when the is small, the discoloration is easily visible. As a result, the indicator containing sodium carbonate as an alkalinizing agent can more accurately and reliably detect changes in urine specific gravity.
（その他の添加成分）
　本発明のインジケータは、吸収性物品用のインジケータに用い得る任意の添加成分を更に含んでいてもよい。そのような添加成分としては、特に限定されないが、例えば、酸化防止剤や光安定化剤、抗菌剤、香料などが挙げられる。 (Other additive ingredients)
The indicator of the present invention may further contain optional additive components that can be used in indicators for absorbent articles. Examples of such additive components include, but are not particularly limited to, antioxidants, light stabilizers, antibacterial agents, fragrances, and the like.
　上記の各成分からなるインジケータ用組成物は、特に限定されないが、任意の加熱溶融手段を用いて混合することにより製造することができる。 Although the indicator composition composed of the above components is not particularly limited, it can be produced by mixing using any heating and melting means.
　本発明のインジケータは、上述した実施形態や後述する実施例等に制限されることなく、本発明の目的、趣旨を逸脱しない範囲内において、適宜組み合わせや代替、変更等が可能である。 The indicator of the present invention is not limited to the above-described embodiments and examples described later, and can be appropriately combined, substituted, changed, etc. within the scope of the present invention without departing from the purpose and spirit of the present invention.
　以下、実施例を例示して本発明を更に具体的に説明するが、本発明はこれら実施例のみに限定されるものではない。 The present invention will be described in more detail below with reference to examples, but the present invention is not limited only to these examples.
実施例１
　脂肪族アルコールとしての１－ドコサノールと、アミン系の陽イオン界面活性剤としての第４級アンモニウム塩と、親水性高分子としての軟化点が約１２０℃のポリアミドと、ｐＨ指示薬としてのメチルレッド及びＢＴＢと、アルカリ化剤としての炭酸ナトリウムと、糖アルコール成分としてのグリセリンと、疎水性成分としてのナフテンオイルとを、下記の表１に示す配合組成で混合し、インジケータ用組成物を得た。次いで、このインジケータ用組成物を溶融して、使い捨ておむつの裏面シート形成用のシート状基材の表面に塗布し、さらにそれを冷却して固化させることによって、実施例１のインジケータを作製した。 Example 1
1-docosanol as an aliphatic alcohol, a quaternary ammonium salt as an amine cationic surfactant, a polyamide having a softening point of about 120° C. as a hydrophilic polymer, methyl red as a pH indicator and BTB, sodium carbonate as an alkalizing agent, glycerin as a sugar alcohol component, and naphthenic oil as a hydrophobic component were mixed according to the composition shown in Table 1 below to obtain an indicator composition. Next, this indicator composition was melted, applied to the surface of a sheet-like base material for forming the back sheet of a disposable diaper, and further cooled and solidified to produce an indicator of Example 1.
実施例２～５
　各種成分の配合比率や種類等を下記の表１に示すように変更したこと以外は、実施例１と同様にして、実施例２～５のインジケータを作製した。 Examples 2-5
Indicators of Examples 2 to 5 were produced in the same manner as in Example 1, except that the compounding ratios and types of various components were changed as shown in Table 1 below.
　実施例１～５のインジケータについて、下記の各種評価方法（すなわち、＜変色性評価＞、＜変色速さ評価＞及び＜排尿後（吸収後）の保持性評価＞）に従って、尿比重の変化に対する反応性を評価した。実施例１～５のインジケータの配合組成及び尿比重の変化に対する反応性の評価結果は、下記の表１に示す。 Regarding the indicators of Examples 1 to 5, according to the following various evaluation methods (that is, <evaluation of discoloration>, <evaluation of discoloration speed> and <evaluation of retention after urination (after absorption)>), changes in urine specific gravity Reactivity was evaluated. Table 1 below shows the composition of the indicators of Examples 1 to 5 and the evaluation results of reactivity to changes in urine specific gravity.
＜変色性評価＞
　使い捨ておむつのバックシートに用いられる一般的な白色の防漏フィルム(ポリエチレンフィルム)に、評価対象のインジケータを６ｍｍ幅、２０ｇ／ｍ２の塗工量で線状に塗工し、変色性評価用の試験片を作製する。
　作製した試験片のインジケータの上にろ紙（東洋濾紙製、アドバンテック定性ろ紙Ｎｏ．２（ＪＩＳ　Ｐ　３８０１［ろ紙（化学分析用）］に規定される２種に相当））を載せる。
　尿比重が１．０００～１．０４５の範囲内にある複数種類の尿を用意し、各比重の尿を評価対象のインジケータの上に載せたろ紙上に２ｍＬ滴下する。
　滴下してから１５分経過後にろ紙を取り除き、インジケータの変色の識別の可否を色見本と比較することによって評価する。０．００５の尿比重の差異の変色を識別可能な場合を「〇」（尿比重の差異を精度よく検知可能）とし、０．０１０の尿比重の差異の変色を識別可能な場合を「×」（尿比重の差異を精度よく検知できない）とする。 <Discoloration evaluation>
The indicator to be evaluated was linearly coated on a general white leak-proof film (polyethylene film) used for the back sheet of disposable diapers with a width of 6 mm and a coating weight of 20 g/m 2 for discoloration evaluation. Prepare a test piece of
A filter paper (Advantech qualitative filter paper No. 2 manufactured by Toyo Roshi Kaisha, Ltd. (equivalent to type 2 specified in JIS P 3801 [filter paper (for chemical analysis)])) is placed on the indicator of the prepared test piece.
A plurality of types of urine having a urine specific gravity within the range of 1.000 to 1.045 are prepared, and 2 mL of each specific gravity of urine is dropped onto a filter paper placed on the indicator to be evaluated.
After 15 minutes have passed since the dropping, the filter paper is removed, and whether or not the discoloration of the indicator can be identified is evaluated by comparing with a color sample. The case where the color change due to the difference in urine specific gravity of 0.005 can be identified is indicated as "O" (the difference in urine specific gravity can be accurately detected), and the case where the color change due to the difference in urine specific gravity as 0.010 can be identified as "X". ” (difference in urine specific gravity cannot be detected with high accuracy).
＜変色速さ評価＞
　尿を評価対象となるインジケータに接触させ、１分経過後のインジケータの色（尿による変色後の色）と、１０分経過後のインジケータの色とを、色見本を用いて比較し、両者の色の同一性を評価する。両者の色が同一である場合を「◎」（１分以内に完全に変色可能、すなわち変色速さが非常に速い）とし、両者の色がほぼ同じである場合を「〇」（１分以内にほぼ変色可能、すなわち変色速さが速い）とし、両者の色が同系色である場合を「△」（１分以内に一定以上変色可能、すなわち変色速さが比較的速い）とし、両者の色が異なる場合を「×」（１分以内に変色できない、すなわち変色速さが遅い）とする。 <Discoloration speed evaluation>
Urine is brought into contact with the indicator to be evaluated, and the color of the indicator after 1 minute (color after discoloration due to urine) and the color of the indicator after 10 minutes are compared using a color sample. Evaluate color identity. When both colors are the same, "◎" (color change is possible completely within 1 minute, that is, the color change speed is very fast), and when both colors are almost the same, "○" (within 1 minute) The color can be changed almost immediately, that is, the color change speed is fast), and the case where both colors are similar colors is indicated as "△" (the color can be changed more than a certain amount within 1 minute, that is, the color change speed is relatively fast). If the color is different, it is marked as "x" (cannot change color within 1 minute, that is, the speed of color change is slow).
＜排尿後（吸収後）の保持性評価＞
　尿を評価対象となるインジケータに接触させ、３時間経過後のインジケータの色（尿による変色後の色）を目視で確認可能かどうかを評価する。３時間経過後のインジケータの色を明確に確認できる場合を「〇」（尿や湿気等の水分に対して非常に溶解しにくい）とし、３時間経過後のインジケータの色を確認できる場合を「△」（尿や湿気等の水分に対して溶解しにくい）とし、３時間経過後のインジケータの色を確認できない場合を「×」（尿や湿気等の水分に対して溶解しやすい）とする。 <Retention evaluation after urination (after absorption)>
Urine is brought into contact with the indicator to be evaluated, and it is evaluated whether or not the color of the indicator (color after discoloration due to urine) after 3 hours can be visually confirmed. If the color of the indicator can be clearly confirmed after 3 hours have passed, it is marked as "○" (it is very difficult to dissolve in moisture such as urine and moisture), and if the color of the indicator can be confirmed after 3 hours has passed, it is marked as "○". △” (difficult to dissolve in moisture such as urine and moisture), and when the color of the indicator cannot be confirmed after 3 hours, it is evaluated as “×” (easily soluble in moisture such as urine and moisture). .
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、実施例１～５のインジケータは、尿比重の変化を精度よく検知することができる上、尿や湿気等の水分に対して溶解しにくいことがわかった。 As shown in Table 1, it was found that the indicators of Examples 1 to 5 were able to accurately detect changes in urine specific gravity and were difficult to dissolve in water such as urine and humidity.
　１　　使い捨ておむつ
　２　　表面シート
　３　　裏面シート
　４　　吸収体
　４Ａ　　吸収コア
　４Ｂ　　コアラップシート
　５　　インジケータ REFERENCE SIGNS LIST 1 disposable diaper 2 topsheet 3 backsheet 4 absorbent body 4A absorbent core 4B core wrap sheet 5 indicator

Claims (10)

  1. 　吸収性物品用のインジケータであって、
    　前記インジケータは、尿と接触する前の初期状態においてアルカリ性側の外観色に調整され、尿に接触すると尿比重に応じた色に変色可能であり、
    　ｐＨ指示薬と、
    　２０質量％以上の、常温で固体の脂肪族アルコールと、
    　１０質量％以上の親水性高分子及び１０質量％以上のアミン系の陽イオン界面活性剤のうちの少なくとも一方の成分と、
    を含むことを特徴とする、インジケータ。     An indicator for an absorbent article, comprising:
    The indicator is adjusted to an alkaline appearance color in the initial state before contact with urine, and can change color according to urine specific gravity when in contact with urine,
    a pH indicator;
    20% by mass or more of an aliphatic alcohol that is solid at room temperature;
    At least one component of a hydrophilic polymer of 10% by mass or more and an amine-based cationic surfactant of 10% by mass or more;
    An indicator comprising:
  2. 　前記脂肪族アルコールは、４０℃より高く１１０℃以下の融点を有することを特徴とする、請求項１に記載のインジケータ。 The indicator according to claim 1, wherein the fatty alcohol has a melting point of higher than 40°C and lower than or equal to 110°C.
  3. 　前記親水性高分子がポリアミドを含むことを特徴とする、請求項１又は２に記載のインジケータ。 The indicator according to claim 1 or 2, wherein the hydrophilic polymer contains polyamide.
  4. 　前記アミン系の陽イオン界面活性剤が第４級アンモニウム塩を含むことを特徴とする、請求項１～３のいずれか一項に記載のインジケータ。 The indicator according to any one of claims 1 to 3, characterized in that the amine-based cationic surfactant contains a quaternary ammonium salt.
  5. 　前記ｐＨ指示薬として、２種類以上のｐＨ指示薬を含むことを特徴とする、請求項１～４のいずれか一項に記載のインジケータ。 The indicator according to any one of claims 1 to 4, characterized in that two or more types of pH indicators are included as the pH indicator.
  6. 　糖アルコール成分として、糖アルコール及び糖アルコールの重合体のうちの少なくとも一つの成分を、２．５質量％以上の配合割合で更に含むことを特徴とする、請求項１～５のいずれか一項に記載のインジケータ。 6. The composition according to any one of claims 1 to 5, further comprising, as the sugar alcohol component, at least one of sugar alcohol and a sugar alcohol polymer in a compounding ratio of 2.5% by mass or more. indicator described in .
  7. 　疎水性成分として、ワックス、オイル及び粘着付与樹脂のうちの少なくとも一つの成分を更に含むことを特徴とする、請求項１～６のいずれか一項に記載のインジケータ。 The indicator according to any one of claims 1 to 6, further comprising at least one of wax, oil and tackifying resin as a hydrophobic component.
  8. 　アルカリ化剤として、炭酸ナトリウムを更に含むことを特徴とする、請求項１～７のいずれか一項に記載のインジケータ。 The indicator according to any one of claims 1 to 7, further comprising sodium carbonate as an alkalizing agent.
  9. 　前記インジケータは、低比重の尿に接触すると青色又は緑色に変色し、高比重の尿に接触すると黄色又は橙色に変色することを特徴とする、請求項１～８のいずれか一項に記載のインジケータ。 The indicator according to any one of claims 1 to 8, characterized in that it turns blue or green when it comes into contact with urine of low specific gravity, and turns yellow or orange when it comes into contact with urine of high specific gravity. indicator.
  10. 　請求項１～９のいずれか一項に記載のインジケータを含むことを特徴とする、吸収性物品。 An absorbent article comprising the indicator according to any one of claims 1 to 9.
PCT/JP2022/043383 2021-12-08 2022-11-24 Indicator for absorbent article, and absorbent article WO2023106112A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052540A1 (en) * 2012-09-26 2014-04-03 The Procter & Gamble Company Liquid-activated formulation with hot melt binding matrix
WO2016022795A1 (en) * 2014-08-07 2016-02-11 The Procter & Gamble Company Wetness indicator with permanent colorant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052540A1 (en) * 2012-09-26 2014-04-03 The Procter & Gamble Company Liquid-activated formulation with hot melt binding matrix
WO2016022795A1 (en) * 2014-08-07 2016-02-11 The Procter & Gamble Company Wetness indicator with permanent colorant

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