WO2023106112A1 - 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 - Google Patents

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 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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English (en)
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/ja

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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). .

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PCT/JP2022/043383 2021-12-08 2022-11-24 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 WO2023106112A1 (ja)

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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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