JP2019019436A - Functional sheet and method for producing the same - Google Patents

Abstract

To provide a functional sheet that facilitates visual confirmation of whether it is exhibiting its functions.SOLUTION: A functional sheet has a layer 100 containing a pH indicator I, a functional substance D, and a support. The pH indicator I is fixed to the support with quaternary ammonium salt.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a functional sheet, and more particularly to a functional nonwoven sheet containing a functional substance that exhibits a function by a reaction via water and a method for producing the same.

  Functional articles such as sheets and particles that exhibit a function by a reaction via water are conventionally known. For example, Patent Document 1 discloses an antibacterial nanofiber nonwoven fabric using calcium oxide powder as an antibacterial agent. When water is applied to this nonwoven fabric, the calcium oxide powder and water react to exhibit alkalinity and exhibit an antibacterial effect.

  However, in the nonwoven fabric of Patent Document 1, when water is applied and time elapses, the time comes when the reaction ends and the antibacterial effect is not achieved. If it does so, even if a user continues using a nonwoven fabric, a desired antimicrobial effect will no longer be acquired.

  On the other hand, Patent Literature 2 discloses an antibacterial agent sheet using calcium hydroxide as an antibacterial agent. Reference 2 discloses a configuration in which a mixture including an antibacterial agent, a pH indicator, and an excipient is formed and the surface thereof is coated. And the structure which visually confirms the antimicrobial effect of an antimicrobial agent by the pH change of the solution by a pH indicator is proposed.

JP 2012-246595 A JP 2011-37801 A

  The antibacterial agent sheet proposed in Patent Document 2 has a layer of a mixture containing an antibacterial agent, a pH indicator, and an excipient, and a coating layer on the surface thereof.

  An object of the present invention is to provide a functional sheet containing a functional substance that exhibits a function by a reaction via water, which is easily recognizable as to whether or not the function is being performed, having a configuration different from that of Patent Document 2. There is to do.

  An aspect of the present invention for solving the above problems includes a layer containing a pH indicator, a functional substance, and a carrier, and the pH indicator is fixed to the carrier by a quaternary ammonium salt. This is a functional sheet. Another aspect of the present invention includes a layer containing a pH indicator, a functional substance, and a carrier, and the pH indicator is fixed to the carrier by a quaternary ammonium salt and a binder. It is a functional sheet characterized by being made.

  When water is applied to the functional sheet (nonwoven fabric) according to the embodiment of the present invention, the functional substance contained in the functional sheet exhibits a function due to the reaction via the water, and the water Changes occur in the hydrogen ion concentration at. The pH indicator contained in the functional sheet is colored (colored) or discolored in accordance with the change in the hydrogen ion concentration, thereby changing the color of the functional sheet. The user can visually recognize from the color change of the functional sheet that the functional sheet is functioning and that the functional sheet has been fully functional.

  Therefore, the user can use the functional sheet while the functional sheet is functioning, and can easily determine the use end time of the functional sheet.

It is a figure which shows the structural example of the functional sheet which concerns on embodiment of this invention.

  With reference to FIG. 1, the structure of the functional sheet | seat (nonwoven fabric) which concerns on embodiment of this invention is demonstrated. FIG. 1 is a diagram illustrating the configuration of a functional sheet according to an embodiment of the present invention for the purpose of illustration and not for the purpose of limitation. In the drawings, the same reference numerals indicate the same components. For the same component, repeated description may be omitted.

  1 (a) to 1 (c) show functionality including a layer (hereinafter also simply referred to as a functional substance-containing layer) 100 containing a pH indicator I and a functional substance D according to an embodiment of the present invention. Indicates a sheet. FIG. 1A shows a functional sheet composed only of the functional substance-containing layer 100. FIGS. 1B and 1C are functional sheets in which another layer 300 is laminated on one side or both sides of the functional substance-containing layer 100.

  Thus, the functional sheet according to the embodiment of the present invention may have a single-layer structure, or may have a multilayer structure of two layers, three layers, or four or more layers not shown. . The functional sheet may include two or more functional substance-containing layers 100. The other layer 300 is disposed for the purpose of imparting some functionality to the functional sheet, for example, for the purpose of modifying the surface of the functional sheet or for the purpose of imparting strength (rigidity) to the functional sheet. be able to. For the other layer 300, for example, a sheet of cloth, nonwoven fabric, paper, film, or the like can be used. The other layer 300 may contain a heat-fusible resin. When the functional sheet includes a plurality of layers 300, these layers 300 may be the same material or different materials.

  However, the functional sheet according to the embodiment of the present invention visually recognizes the status of whether or not the function is exerted by the color change of the sheet caused by the pH indicator contained in the functional substance-containing layer 100. Is done. Therefore, the functional sheet according to the embodiment of the present invention has a configuration in which the functional substance-containing layer 100 is the outermost layer, or the outermost layer is a layer 300 other than the functional substance-containing layer 100. The color of the functional substance-containing layer 100 can be visually recognized from the outside through the other layer 300.

  The functional substance-containing layer 100 may contain a pH indicator I and a functional substance D. Here, the pH indicator I is blended in the functional substance-containing layer in a form fixed to a carrier, as will be described later. That is, the functional substance-containing layer 100 includes a carrier on which the pH indicator I is fixed in addition to the pH indicator I and the functional substance D.

  Hereinafter, in this specification, when referring to the configuration “the pH indicator is included in the functional sheet”, unless otherwise specified, “the pH indicator is included in a form fixed to a carrier”. It is intended to be configured. When “the pH indicator is contained in a form fixed to a carrier”, the pH indicator compounded in the functional sheet may of course be fixed to the carrier, but the total amount is not necessarily limited. May not be fixed to the carrier. That is, the functional sheet may contain a pH indicator that is not fixed to the carrier. Each of the pH indicator I and the functional substance D can be included in one type, and is not limited to this, and multiple types are included in the same layer and / or different layers of the functional sheet. Can do. The types of pH indicator I and functional substance D will be described later.

  In addition to the pH indicator I and the functional substance D, the functional substance-containing layer 100 may contain fibers, a heat-fusible resin, an effect accelerator, and the like. Each of the fiber, the heat-fusible resin, and the effect accelerator may be one kind or plural kinds.

  As an example of the configuration for preventing pH indicator I and functional substance D from falling off from the functional sheet, specific embodiments as shown in the following first to sixth embodiments will be described.

(First aspect)
FIG. 1D shows an example in which the functional substance-containing layer 100 includes fibers F. In the functional substance-containing layer 110 containing the fibers F, the pH indicator I and the functional substance D are held in the voids formed by the fibers F, that is, the voids in the fiber structure formed by the fibers F. Powder fall is prevented.

  The functional substance-containing layer 110 containing fibers can contain only the pH indicator I, the functional substance D, and the fibers F. In addition to the pH indicator I, the functional substance D, and the fiber F, the functional substance-containing layer 110 containing fibers may contain a heat-fusible resin, an effect accelerator, and the like. Further, the fiber F itself may be a heat-fusible resin.

  In this aspect, the functional sheet has another layer 300 laminated on one side or both sides of the functional substance-containing layer 110 containing fibers for the purpose of imparting functionality such as surface modification and strength (rigidity). It may have a multilayer structure (not shown).

  However, as described above, whether or not the functional sheet according to the embodiment of the present invention is performing its function due to the color change of the sheet caused by the pH indicator contained in the functional substance-containing layer 100. The status is recognized. Therefore, the functional sheet according to this aspect is a configuration in which the functional substance-containing layer 110 containing fibers is the outermost layer, or the outermost layer is another layer 300 other than the functional substance-containing layer 110 containing fibers. In addition, the color of the functional substance-containing layer 110 including fibers can be recognized through the other layer 300.

(Second aspect)
FIG. 1E shows an example in which the functional substance-containing layer 100 includes the heat-fusible resin A. The functional substance-containing layer 120 containing the heat-fusible resin is obtained by melting the heat-fusible resin A in the mixture containing the pH indicator I, the functional substance D, and the heat-fusible resin A. It is obtained. In this example, the pH indicator I and the functional substance D in the functional substance-containing layer are fixed (also referred to as binding or fixing) while being partially covered with the heat-fusible resin A.

  In the functional substance-containing layer 120 containing the heat-fusible resin, the pH indicator I and the functional substance D are fixed in a partially covered state when the molten heat-fusible resin A is solidified. As a result, powder falling is prevented. The heat-fusible resin A is blended in such an amount that does not cover the entire pH indicator I and the functional substance D. The pH indicator I and the functional substance D are covered with the heat-fusible resin A. It has a part that is not made, and contact with water and elution are guaranteed when the sheet is used.

  The functional substance-containing layer 120 containing the heat-fusible resin can contain only the pH indicator I, the functional substance D, and the heat-fusible resin A. In addition to the pH indicator I, the functional substance D, and the heat-fusible resin A, the functional substance-containing layer 120 containing the heat-fusible resin contains fibers, an effect accelerator, and the like. Also good. Further, the heat-fusible resin A itself may be fibrous.

  In this embodiment, the functional sheet is provided with another layer 300 on one side or both sides of the functional substance-containing layer 120 containing the heat-fusible resin, for example, for the purpose of imparting functionality such as surface modification or strength (rigidity). May have a multilayer structure (not shown) laminated.

  However, as described above, whether or not the functional sheet according to the embodiment of the present invention is performing its function due to the color change of the sheet caused by the pH indicator contained in the functional substance-containing layer 100. The status is recognized. Therefore, the functional sheet according to this aspect has a configuration in which the functional substance-containing layer 120 is the outermost layer, or even if the outermost layer is the other layer 300, the functional sheet is functional via the other layer 300. It has a configuration capable of recognizing the color of the substance-containing layer 120. For example, the other layer 300 may have a mesh structure, a thin thickness that can be seen through the lower layer, or a transparent or translucent material.

(Third aspect)
FIG. 1F shows an example in which the layer adjacent to the functional substance-containing layer 100 includes the heat-fusible resin B. The layer 200 containing the heat-fusible resin B adjacent to the functional substance-containing layer 100 is disposed on the surface of the functional substance-containing layer 100 so that the heat-fusible resin B is heated. It was obtained by melting. In this example, the pH indicator I and the functional substance D in the functional substance-containing layer 100 are fixed in a state where a part thereof is covered with the heat-fusible resin B. The heat-fusible resin A contained in the layer 120 and the heat-fusible resin B contained in the layer 200 may be the same resin or different resins.

  The functional substance D contained in the functional substance-containing layer 100 is partially coated when the heat-fusible resin B melted in the layer 200 containing the heat-fusible resin B adjacent thereto is solidified. By being fixed, powder fall-off is prevented. Moreover, the functional substance D has a part which is not coat | covered with the heat-fusible resin B, and the contact and elution with water at the time of sheet | seat use are ensured.

  The layer 200 containing the heat-fusible resin B can contain only the heat-fusible resin B. In addition to the heat-fusible resin B, the layer 200 containing the heat-fusible resin B may contain fibers, an effect accelerator, and the like. When these other components are included, the layer 200 containing the heat-fusible resin B is heated by placing a mixture of the heat-fusible resin B and these other components on the surface of the functional substance-containing layer 100. Can be obtained by melting the heat-fusible resin B.

  In detail, the functional sheet of the example shown in FIG. 1 (f) includes a layer 200 containing a heat-fusible resin B, a functional substance-containing layer 100 composed of a pH indicator I and a functional substance D, and a pH indicator. And a functional substance-containing layer 120 containing the functional substance D and the heat-fusible resin A. In the case of this example, the functional substance-containing layer 120 can also contribute to the prevention of powder falling of the pH indicator I and the functional substance contained in the functional substance-containing layer 100 positioned as the intermediate layer.

  Here, a functional substance-containing layer 100 composed of a pH indicator I and a functional substance D, and a functional substance-containing layer 120 further containing a heat-fusible resin A in addition to the pH indicator I and the functional substance D, Although illustrated and described as separate layers, the two layers are integrally formed, and the constituent materials, pH indicator I, functional substance, and heat-fusible resin A are unevenly distributed in the thickness direction. A configuration in which the one functional substance-containing layer 120 is also included in this embodiment. According to this aspect, in particular, when a powdery material is unevenly distributed on one surface side of the functional substance-containing layer 120, the powder is effectively removed by arranging the layer 200 adjacent to the surface. Can be prevented.

  In addition, although both the layer 100 and the layer 120 are illustrated and described as including the pH indicator I and the functional substance D, the pH indicator I is included in only one of the layer 100 and the layer 120. It may be. From the viewpoint of the visibility of the color change of the functional sheet, the pH indicator I is preferably contained on the outer surface side of the functional sheet.

  In this aspect, the layer 200 containing the heat-fusible resin B may be provided on both surfaces of the functional substance-containing layer. That is, for example, a configuration (not shown) including the layer 200 including the heat-fusible resin B, the functional substance-containing layer, and the layer 200 including the heat-fusible resin B in this order is the configuration of this aspect. It is a range.

  In this embodiment, the functional sheet is formed on the outer surface of the laminate of the functional substance-containing layer and the layer 200 including the heat-fusible resin B for the purpose of imparting functionality such as surface modification and strength (rigidity). You may have the multilayered structure (not shown) by which the other layer 300 was laminated | stacked on the single side | surface or both surfaces. In this case, the other layer 300 is configured so as not to hinder the visual recognition of the color change of the functional sheet.

(Fourth aspect)
The functional sheet according to the embodiment of the present invention described above may be formed by heat sealing. As an example, FIG. 1 (g) shows a configuration in which another layer 300 containing a heat-fusible resin is laminated on both surfaces of the functional substance-containing layer 100 and the four sides are heat-sealed. At least one of the other layers 300 has a configuration capable of recognizing the color of the functional substance-containing layer 100 through the other layer 300.

(Fifth aspect)
FIG. 1H is an example in which an adhesive layer is provided adjacent to the functional substance-containing layer 100. The adhesive layer 500 adjacent to the functional substance-containing layer is obtained by disposing an adhesive layer on the surface of the functional substance-containing layer. The adhesive layer is not particularly limited as long as it is a layer exhibiting an adhesive function so as to prevent the powder of the pH indicator I and the functional substance D contained in the functional substance-containing layer 100 from being removed. For example, a hot melt adhesive Etc.

  In detail, the functional sheet of the example shown in FIG. 1 (h) includes an adhesive layer 500 made of a hot-melt adhesive such as a thermoplastic resin between the functional substance-containing layer 100 and the other layer 300. Between the layers by hot melt processing.

  More specifically, in the functional sheet of the example shown in FIG. 1 (h), the pH indicator I, the functional substance D, and heat fusion are provided on the surface of the functional substance-containing layer 100 opposite to the adhesive layer 500. The functional material-containing layer 120 containing the functional resin A is included. Also in the functional sheet of the example shown in FIG. 1 (h), the functional substance-containing layer 120 containing the heat-fusible resin A is positioned as an intermediate layer as in the case of the example shown in FIG. 1 (f). In addition, the pH indicator I and the functional substance D contained in the functional substance-containing layer 100 can contribute to prevention of powder falling. In addition, although the functional substance-containing layer 100 and the functional substance-containing layer 120 including the pH indicator I, the functional substance D, and the heat-fusible resin A are illustrated and described as separate layers, the two The layers are integrally formed, and the functional material-containing layer 120 of one layer in which the pH indicator I, the functional material D, and the heat-fusible resin A as constituent materials are unevenly distributed in the thickness direction is formed. This configuration is also included in this aspect. According to this aspect, in particular, when a powdery material is unevenly distributed on one surface side of the functional substance-containing layer 120, the powder is effectively removed by arranging the layer 200 adjacent to the surface. Can be prevented.

  Further, although the pH indicator I and the functional substance D are shown and described as being included in both the outermost layer 120 and the inner layer 100, the pH indicator I May be included in only one of them. From the viewpoint of the visibility of the color change of the functional sheet, the pH indicator I is preferably contained on the outer surface side of the functional sheet.

(Sixth aspect)
The functional sheet according to the above-described embodiment of the present invention may be formed by embossing. As an example, FIG. 1 (i) shows a configuration in which another layer 300 is laminated on both surfaces of a functional substance-containing layer 120 containing a heat-fusible resin A, and the layers are bonded together by embossing. At least one of the other layers 300 has a configuration capable of recognizing the color of the functional substance-containing layer 100 through the other layer 300.

  The configuration of the functional sheet of the present invention has been described above with reference to FIGS. However, these are merely examples, and other configurations, for example, combinations of the exemplified embodiments are also included in the scope of the present invention. For example, the layer shown as the functional substance-containing layer 100 in the figure may be the functional substance-containing layer 110 containing the fibers F, or the functional substance-containing layer 120 containing the heat-fusible resin A, or Further, it may be a layer containing both the fiber F and the heat-fusible resin A. Similarly, configurations in which layers are replaced between these layers are included in the scope of the present invention.

  Below, the detail of the component of the functional sheet which concerns on this invention is demonstrated.

<Functional sheet (nonwoven fabric)>
The functional sheet according to an embodiment of the present invention is a functional sheet including a layer containing a pH indicator, a functional substance, and a carrier, and the pH indicator is fixed to the carrier by a quaternary ammonium salt. It is the functional sheet | seat characterized by being contained in the said layer with the formed form.

  The “sheet” can also be expressed as “nonwoven fabric sheet” or simply “nonwoven fabric”. That is, it can also be said that the sheet according to the embodiment of the present invention is a nonwoven fabric provided with a layer containing a pH indicator and a functional substance. In the present specification, the “layer containing a pH indicator and a functional substance” is also simply referred to as a “functional substance-containing layer”. The functional substance-containing layer is provided by a non-aqueous manufacturing method and is preferably a nonwoven fabric.

<Layer containing functional substances>
The functional sheet (nonwoven fabric) of the embodiment of the present invention has a layer containing a functional substance. In this specification, a layer containing a functional substance is also referred to as a functional substance-containing layer. The functional substance contained in the functional substance-containing layer is not limited to one type and may be a plurality of types. In addition to the functional substance, the functional substance-containing layer may contain a pH indicator, a fiber, a heat-fusible resin, an effect accelerator, and the like. When there are a plurality of functional substance-containing layers, the pH indicator is contained in at least one layer, preferably the outermost layer.

<Functional substances>
The functional substance D used in the embodiment of the present invention is a substance that exerts a function by contacting with water or a substance that exhibits a function by a reaction via water.

  Non-limiting examples of functional substances include metal oxides and / or metal hydroxides, cyclodextrins, carbon dioxide generators and the like. In addition, the present invention is not limited thereto, and a substance that exhibits a function in contact with water or a substance that can exhibit a function by a reaction via water may be used as the functional substance according to the embodiment of the present invention. it can.

(Metal oxide and / or metal hydroxide)
(Metal oxide)
The metal oxide that can be used in the embodiment of the present invention is a metal oxide that becomes strong alkali upon contact with water, preferably a divalent metal oxide, more preferably Group 2 of the periodic table. An oxide of an elemental metal, more preferably a metal oxide represented by MO (wherein M is Mg, Ca, Sr or Ba), and particularly preferably an oxide of an alkaline earth metal . As non-limiting examples, magnesium oxide (11.4), calcium oxide (12.7), strontium oxide (13.2), barium oxide (13.4), and manganese oxide (10.6) are preferably used. can do. The numerical value in parentheses after the substance name indicates the value of the acid dissociation constant pKa. The metal oxide to be used can be selected according to a use or a desired effect. For example, in applications that come into contact with food, calcium oxide is preferably used from the viewpoint of safety and the like. These metal oxides can be used alone or in combination.

(Metal hydroxide)
The metal hydroxide that can be used in the embodiment of the present invention is a metal hydroxide that becomes strong alkali upon contact with water, preferably a divalent metal hydroxide, more preferably a periodicity. Table 2 is a metal hydroxide of a group 2 element, more preferably a metal hydroxide represented by M (OH) ₂ (wherein M is Mg, Ca, Sr or Ba), and particularly preferably Is an alkaline earth metal hydroxide. Non-limiting examples include magnesium hydroxide (11.4), calcium hydroxide (12.7), strontium hydroxide (13.2), barium hydroxide (13.4), and manganese hydroxide (10. 6) can be preferably used. The numerical value in parentheses after the substance name indicates the value of the acid dissociation constant pKa. The metal hydroxide to be used can be selected according to a use or a desired effect. For example, in applications that come into contact with food, calcium hydroxide is preferably used from the viewpoint of safety and the like. These metal hydroxides can be used alone or in combination.

  Thus, the layer containing the metal component is a layer containing a metal oxide and / or metal hydroxide, and the metal component constituting the metal oxide and / or metal hydroxide is the metal oxide. The metal component in which the product and / or metal hydroxide comes into contact with water and becomes strong alkali. The metal component is preferably a divalent metal, more preferably a metal of a Group 2 element of the periodic table, and still more preferably a metal represented by M (wherein M is Mg, Ca, Sr or Ba). Yes, particularly preferably an alkaline earth metal.

  The metal oxide and / or metal hydroxide that can be used in the embodiment of the present invention is used in the form of powder (particles). The metal oxide and / or metal hydroxide in the form of powder (particles) can be obtained by any method known in the art, and can be purchased from the manufacturer. For example, in the case of calcium oxide, Okhotsk calcium manufactured by Natural Japan Co., Ltd., scallop shell baked powder manufactured by Unicera Co., Ltd., and the like can be suitably used. For example, in the case of calcium hydroxide, Scarlow (registered trademark) manufactured by Antibacterial Research Institute, Inc. and sold by Hishie Chemical Co., Ltd. can be suitably used. In the case of calcium oxide or calcium hydroxide, calcium (calcium carbonate) obtained from scallop shells can be suitably used as the calcium raw material, but is not limited to this, and shells of other shells (for example, oysters) For example, sea urchin shells), animal bones (for example, sea urchin shells), and minerals.

  The average particle diameter of the metal oxide and / or metal hydroxide powder (particles) is not limited, but is preferably 1-1000 μm, more preferably 2-800 μm. If the average particle size is too small, there are concerns such as dropping off from the sheet (nonwoven fabric) and reduction in work efficiency due to scattering in the production process. Moreover, when the said average particle diameter is too large, it may become difficult to mix | blend uniformly with the whole nonwoven fabric.

(Cyclodextrin)
Cyclodextrins are also called cyclodextrins or cyclic oligosaccharides, and have the ability of incorporating various molecules as cavities into the cavity (inclusion) to form inclusion complexes, and the ability to slowly release the incorporated guest molecules. All of α-cyclodextrin, 7 β-cyclodextrin, and 8 γ-cyclodextrin having 6 glucose groups in one molecule of cyclodextrin are compatible with the functional component to be included. Can be used. The cyclodextrin may be chemically modified such as methylation, hydroxylation, acetylation and the like. Moreover, the cyclodextrin may have a branch. These cyclodextrins can be used alone or in combination in the embodiment of the present invention.

  In the embodiment of the present invention, a cyclodextrin as described above in which a functional component is included can be used. The cyclodextrin used may contain empty cyclodextrin that does not include functional components.

(Functional component included in cyclodextrin)
As the functional component included in the cyclodextrin, various functional components can be used according to the use and purpose of the functional sheet containing cyclodextrin.

  Functional ingredients such as wasabi, mustard, pepper, ginger, lemon, orange, grapefruit, yuzu, ume, green tea, almond, natural meat flavor, rose, herbs, etc. Ingredients, natural product antibacterial agents or fragrances such as plant extracts and tea extracts, natural or organic volatile antibacterial agents or fragrances such as l-menthol components, and cosmetic raw materials such as coenzyme Q10 and isoflavones.

  In addition to those described above, functional ingredients include, for example: medicinal ingredients, moisturizers, feel improvers, antioxidants, reducing agents, oxidizing agents, preservatives, antibacterial agents, pH adjusters, UV absorbers, whitening agents Agents, vitamins and derivatives thereof, anti-inflammatory agents, anti-inflammatory agents, hair growth agents, blood circulation promoters, stimulants, hormones, anti-wrinkle agents, anti-aging agents, squeeze agents, cooling agents, warming agents, wounds Healing accelerant, stimulant relieving agent, analgesic agent, cell activator, plant / animal / microbe extract, antipruritic agent, exfoliating / dissolving agent, antiperspirant, refreshing agent, astringent, fragrance, pigment, coloring agent, anti-inflammatory analgesic Agents, antifungal agents, antihistamines, hypnotic sedatives, tranquilizers, antihypertensive agents, antihypertensive diuretics, antibiotics, anesthetics, antibacterial agents, antiepileptic agents, coronary vasodilators, crude drugs, adjuvants, wetting agents , Antidiarrheal, keratin softening release agent, antiseptic disinfectant, fat-soluble substance, deodorant component, etc. The known compounds can be arbitrarily selected depending on the application and purpose.

  These functional components can be used alone or in combination in a functional sheet containing cyclodextrin.

(Cyclodextrin containing functional ingredients)
In the embodiment of the present invention, the cyclodextrin in which the functional component is included is used in the form of powder (particles). The cyclodextrin in which the functional component is included in the form of powder (particles) can be obtained by any method known in the art, and can also be purchased from a manufacturer. For example, Dexie Ace (product using cyclodextrin) manufactured by Shimizu Minato Sugar Co., Ltd., CAVAMAX (registered trademark) manufactured by Cyclochem, etc. can be suitably used. In these powders (particles), the cyclodextrin in which the functional component is included is not included in addition to the cyclodextrin in which the functional component is included. Of cyclodextrin may be included.

(Carbon dioxide generator)
The carbon dioxide generator is a two-component material that generates carbon dioxide by the reaction between a base and an acid. These materials are preferably formulated in separate layers. The carbon dioxide generator according to the embodiment of the present invention is a combination of a carbonate and / or bicarbonate and a solid acid.

(Carbonate and / or bicarbonate)
As carbonate or bicarbonate, when used as a cosmetic, any grade that can be used in cosmetics can be used without any particular limitation. When used for other purposes, no particular grade is specified. For example, sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, potassium carbonate, potassium bicarbonate, calcium carbonate, magnesium carbonate, magnesium bicarbonate, calcium bicarbonate, or a derivative thereof can be used. Two or more carbonates and / or bicarbonates may be used in combination. The carbonate and / or bicarbonate is a solid composition, for example, preferably in the form of particles. The carbonate and / or bicarbonate may be in a form supported on a support such as silica. The carbonate and / or bicarbonate may contain water as crystal water. When water of crystallization is included, the solubility in water increases and the reactivity is improved. However, from the viewpoint of storage stability, it is preferable that the carbonate layer does not contain water that causes alteration such as hydrolysis and reaction with an acid. As the carbonate or bicarbonate used in the present invention, particles having an average particle diameter of 5 to 5000 μm are preferable. When the average particle size is 5 to 5000 μm, the dropout of the particles is small, and a good feeling of use can be obtained with an appropriate granular feeling.

(acid)
When used as a cosmetic, the acid can be used without particular limitation as long as it is of a grade that can be used in cosmetics, and no special grade is specified when used for other purposes. For example, malonic acid, maleic acid, citric acid, malic acid, tartaric acid, succinic acid, fumaric acid, hyaluronic acid, sodium dihydrogen phosphate or a derivative thereof, a substance that is hydrolyzed to generate an acid, and the like can be used. Two or more acids may be used in combination. The acid is a solid composition, and is preferably in the form of particles, for example. The acid may contain water as crystal water. When water of crystallization is included, the solubility in water increases and the reactivity is improved. However, from the viewpoint of storage stability, it is preferable that the acid layer does not contain water that causes alteration such as hydrolysis and reaction with carbonate. As the acid used in the present invention, particles having an average particle diameter of 5 to 5000 μm are preferable. When the average particle size is 5 to 5000 μm, the dropout of the particles is small, and a good feeling of use can be obtained with an appropriate granular feeling. When the average particle size is reduced, the dissolution rate is increased, and the reaction proceeds immediately after being wetted with water, so that the amount of CO ₂ gas generated in the initial stage of use is increased.

  Moreover, when using it for skin, a granular feeling can be reduced. On the other hand, increasing the average particle size has the effect of extending the duration of carbon dioxide gas generation because dissolution gradually proceeds when contacted with water. In addition, increasing the average particle diameter has the effect of reducing particle dropout.

<PH indicator>
The pH indicator is also referred to as an acid-base indicator and is not particularly limited as long as it is an indicator that reacts with hydrogen ions in the solution and changes color tone according to the hydrogen ion concentration.

  Examples of pH indicators applicable to the embodiments of the present invention include methyl bio red, thymol blue, Congo red, methyl yellow, bromothymol blue (also called bromthymol blue), methyl red, methyl orange, litmus, bromocresol. Synthetic pigments such as purple (also referred to as bromcresol purple), phenol red, phenolphthalein, cresolphthalein, thymolphthalein, alizarin yellow R, eriochrome black T, and the like. In addition, natural pigments such as red cabbage pigment, perilla pigment, purple potato pigment, red radish pigment, purple corn pigment, elderberry pigment, and grape / blueberry pigment can be used.

  These synthetic dyes and natural dyes are generally known and can be purchased from manufacturers. In the present specification, the pH indicator is also simply referred to as a pigment.

  Only one type of pH indicator may be used, but by using a combination of two or more types, it is possible to provide a non-woven fabric product corresponding to a wide range of pH changes. For example, by combining methyl orange and bromothymol blue, the color tone can be changed in the range of pH 2-9.

<Carrier>
A support | carrier is a substance used as the foundation for fixing a pH indicator to a functional sheet | seat (nonwoven fabric). The carrier is also referred to as a carrier or a support. The carrier is also a component of the functional substance-containing layer in which the pH indicator is blended in the functional sheet. For example, when the nonwoven fabric sheet is a structure composed of fibers, the pH indicator may be fixed to the nonwoven fabric sheet using such fibers as a carrier. Alternatively, the pH indicator may be fixed to the non-woven fabric sheet by holding the carrier in the voids in the fiber structure constituted by such a fiber using a component other than the fiber, for example, a particulate substance as the carrier. Alternatively, both may be used.

  Examples of carriers applicable to the embodiments of the present invention include pulps derived from wood, hemp, cotton, Manila hemp, etc., cellulose materials such as cellulose, hemicellulose, microcrystalline cellulose, ion exchange cellulose, nylon, polyester , Synthetic fibers such as acrylic, kaolin, synthetic silica, glass, aluminum silicate, zeolite, fine powders of clay minerals such as bentonite, starch, protein and the like. The shape of the carrier is not particularly limited and may be particulate or fibrous.

Pulp is a collection of cellulose fibers taken from wood or other plants by mechanical or chemical treatment. Plants, particularly their cell walls, generally contain cellulose and hemicellulose as constituents as water-insoluble polysaccharides. Among these, cellulose is a polysaccharide (carbohydrate) represented by a molecular formula (C ₆ H ₁₀ O ₅ ) _n , and hemicellulose is a general term for non-cellulosic polysaccharides. The pulp contains cellulose as a main component and generally contains both cellulose and hemicellulose, but may contain only cellulose. Hereinafter, in the present specification, cellulose and hemicellulose may be collectively referred to as cellulose. That is, in the present specification, for example, the cellulose fiber may be composed mainly of cellulose and composed only of cellulose, or may include cellulose and hemicellulose.

  The pulp may be wood pulp obtained from wood raw materials such as conifers and hardwoods, and may be non-wood pulp made from non-wood raw materials such as herbs such as cotton and hemp. Wood pulp can be obtained, for example, by processing kraft cooking or the like on wood chips, but the production method is not limited to this, and wood pulp produced by a known method can be used to implement the present invention. Examples of carriers that can be applied to these forms are included.

  Microcrystalline cellulose is obtained by hydrolyzing pulp to remove non-crystalline regions, and the main component is crystalline cellulose.

  The ion-exchange cellulose is a product obtained by introducing a positively or negatively charged group into cellulose and imparting properties as an ion exchanger. Examples of ion exchange cellulose include diethylaminoethyl cellulose, carboxymethyl cellulose (CMC), phosphocellulose and the like.

  The cellulose derivative is a polymer compound obtained by partially modifying cellulose. The above ion-exchange cellulose is also a kind of cellulose derivative. Examples of the cellulose derivative include cellulose acetate, carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), hydroxypropylmethylcellulose (HPMC) and the like.

  Cellulose fibers can be preferably used from the viewpoint of excellent formation and appearance when blended with the nonwoven fabric. The cellulose fibers may be long fibers, short fibers, or may be processed into powder. In terms of fiber length, cellulose fibers of about 0.01 mm to 5 mm can be preferably used. For example, powdered cellulose manufactured by Rettenmeier has products with an average fiber length of 18 μm to 2.2 mm, and cellulose fibers having a suitable fiber length can be used.

  Powdered cellulose fibers can be used for dye coating treatment without pretreatment. The sheet-like cellulose fiber may be used after being defibrated after being cut into a size suitable for subsequent mechanical treatment as a pretreatment for the dye coating treatment.

<Quaternary ammonium salt>
The quaternary ammonium salt is added to promote the color development of the pH indicator to clarify the color change and to enhance the adhesion of the pH indicator to the carrier.

  A quaternary ammonium salt is a salt of a quaternary ammonium cation and another anion. The quaternary ammonium cation is a polyatomic ion having a positive charge represented by the molecular formula NR4 + (wherein R is an alkyl group or an aryl group), and is always charged in a solution regardless of the pH of the solution. It is known as a material. This quaternary ammonium cation is considered to attach the pH indicator to the carrier by a chemical bond such as a surface active action or an ionic bond.

  Examples of quaternary ammonium salts applicable to embodiments of the present invention include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, benzyltrimethylammonium chloride, benzyltriethylammonium chloride, cetylpyridium chloride, Examples thereof include benzalkonium chloride, benzethonium chloride, dialkyldimethylammonium chloride, didecyldimethylammonium chloride, distearyldimethylammonium chloride and the like. Cetylpyridinium chloride, benzethonium chloride, or didecyldimethylammonium chloride can be preferably used. In particular, benzylzirconium chloride can be preferably used.

<Binder>
The binder is used to immobilize the pH indicator on the carrier. The binder is preferably one that does not adversely affect the color reaction of the pH indicator. The binder is preferably a water-insoluble polymer compound.

  Examples of binders applicable to the embodiments of the present invention include cellulose derivatives such as nitrocellulose, cellulose acetate, and ethyl cellulose, or polyester resins, alkyd resins, polyurethane resins, epoxy resins, acrylic resins, vinyl chloride resins, Examples thereof include synthetic resins such as vinyl chloride copolymer resins, polyvinyl butyral resins, polyvinyl acetate emulsions, acrylate copolymer emulsions, vinylidene chloride copolymer emulsions, epoxy resin emulsions, and synthetic rubber latexes.

  When a binder is used to fix the pH indicator to the carrier, first, in addition to the pH indicator and the quaternary ammonium salt, the binder is dissolved in a solvent to obtain a pH indicator mixed solution (hereinafter also referred to as a dye solution). To prepare. The dye solution is then coated on the carrier by a method such as spray application or dropping. Thereby, the pH indicator and the quaternary ammonium salt are physically fixed to the carrier.

  Since it is mixed as a component of the dye solution, it is preferably a binder having high solubility in a solvent and low viscosity. The viscosity of the binder is preferably 60 mPa · s or less, more preferably 30 mPa · s, in a solution prepared with ethanol / toluene (1/1) (w / w) so that the final concentration is 10% by mass. -It is desirable that it is below s.

(fiber)
As the fibers F, natural fibers such as pulp, rayon, hemp, cotton, silk, wool, mineral fibers, and synthetic fibers such as polylactic acid, nylon, polyvinyl alcohol (PVA), and polymer-absorbing fibers (SAF) may be used. it can. Since these fibers have water absorbability, they can be blended as a water absorbent material to promote contact and dissolution with functional water when the functional sheet is used. Moreover, a non-water-absorbing fiber can also be used as the fiber of the present invention. The heat-fusible resin described below may be used in the form of fibers. These fibers can be used, for example, in the form of a defibration shortcut fiber. Two or more of these fibers may be used in combination.

(Heat-fusion resin)
In the embodiment of the present invention, the heat-fusible resin A is a binder resin that binds the constituent components. The heat-fusible resin has an effect of imparting strength to the functional sheet, and the functional sheet contains the heat-fusible resin, so that the shape is easily maintained.

  The heat-fusible resin can bind the functional substances, the functional substance and the pH indicator, and the pH indicator. When other components are included, the heat-fusible resin can bind the functional materials to each other, the functional materials and the pH indicator, or the pH indicators to each other. The heat-fusible resins A and B are in such an amount that they do not cover the entire powder (particles) of the functional substance when melted and solidified so as not to prevent the contact and elution of the functional substance with water. Blended.

  The heat-fusible resin may be fibrous or particulate. From the viewpoint of higher strength, the heat-fusible resin is preferably fibrous. The heat-fusible resin may be in the form of a shortcut fiber, for example.

  The heat-fusible resin includes polyethylene (PE), polypropylene, polyethylene terephthalate (PET) such as low melting point polyethylene terephthalate, ethylene / vinyl acetate copolymer (EVA), low melting point polyamide, low melting point polylactic acid, polybutylene succin And the like.

  The heat-fusible resin may be a composite of two or more kinds of resins. For example, a core-sheath fiber composed of a core part and a sheath part, a side-by-side fiber made of a resin in which a half on one side and a half on the other side are different in a cross section perpendicular to the longitudinal direction, and a core and a shell made of different resins Examples include core-shell particles. Among them, a core-sheath fiber is preferable when it is desired to improve the rigidity of the nonwoven fabric while exhibiting the performance of the heat-fusible resin.

As the core-sheath fiber, for example, a core portion made of polypropylene fiber (melting point 160 ° C.),
PP / PE composite core-sheath fiber provided with the sheath part which consists of polyethylene (melting | fusing point 130 degreeC) formed in the outer periphery of this core part is mentioned. Other core sheath fibers include PP / EVA composite core sheath fiber, PET / low melting point PET composite core sheath fiber, high density polyethylene / low density polyethylene composite core sheath fiber, PET / PE composite core sheath fiber, polyamide / Examples include low melting point polyamide composite core-sheath fibers, polylactic acid / low melting point polylactic acid composite core-sheath fibers, and polylactic acid / polybutylene succinate composite core-sheath fibers. Among core-sheath fibers, composite core-sheath fibers having a sheath portion made of polyethylene, such as PP / PE composite core-sheath fibers, PET / PE composite core-sheath fibers, and PE / PE composite core-sheath fibers, are preferable.

  As the heat-fusible resin, (1) PET heat-fusible fiber, (2) composite core-sheath fiber having a sheath portion made of PET, (3) polyethylene heat-fusible fiber, (4) made of polyethylene Preferably, at least one selected from the group consisting of a composite core-sheath fiber provided with a sheath part, (5) EVA heat-fusible fiber, and (6) a composite core-sheath fiber provided with a sheath part made of EVA. More preferred is at least one selected from the group consisting of fusible fibers and core-sheath fibers having a sheath portion made of polyethylene.

  Two or more kinds of heat-fusible resins may be used in combination. That is, the heat-sealable resins A and B may be the same heat-sealable resin or different heat-sealable resins. As the heat-fusible resin A and the heat-fusible resin B, one kind of heat-fusible resin may be used, or plural kinds of heat-fusible resins may be used in combination. When the functional sheet includes another layer 300 to be described later and the other layer 300 includes a heat-fusible resin, the heat-fusible resin included in the other layer 300 is heat-sealed. May be the same as or different from the functional resins A and B, and may be one type or a combination of a plurality of types.

(Other layers)
In addition to the functional substance-containing layers 100, 110, 120, the functional sheet of the present invention can include other layers 300 for the purpose of imparting functionality such as surface modification and strength (rigidity). .

  As the other layer 300, for example, any sheet having a property of passing moisture (water permeability) and / or a property of absorbing moisture (water absorption), such as a nonwoven fabric, cloth, and paper can be used. Moreover, arbitrary films can be used. The other layer 300 may contain a heat-fusible resin. When a film having relatively low water permeability is used on one surface of the functional sheet, it is possible to prevent the functional component from eluting from the surface when the sheet is used. That is, it can promote that the component of a functional substance elutes from the other surface.

  The surface of the other layer 300 that is the outer layer of the functional sheet may be subjected to surface processing such as provision of unevenness or processing such as formation of holes or slits. For example, in applications such as mats for food trays, it is preferable to use a perforated film or a film with slits in which a large number of holes such as a sanitary material surface material are formed on one or both surfaces of the functional sheet. Can do. With such a configuration, the functional substance can be easily eluted by the holes and slits when the sheet is used, and drip from the food can be absorbed into the inner layer of the functional sheet.

  From the viewpoint of the visibility of the color change of the functional sheet, the other layer 300 preferably has a configuration capable of recognizing the color of the functional substance-containing layer through the layer 300. For example, the other layer 300 may have a mesh structure having a mesh size such that the constituent material of the functional substance-containing layer does not leak to the outside. In addition, the other layer 300 may be thin and visible through the lower layer, or may be made of a transparent or translucent material.

(Effect promoter)
In the functional sheet of the present invention, one or more effect promoters can be blended depending on the application.

  Examples of the effect promoter include: oily base, moisturizer, touch improver, surfactant, polymer, thickener / gelator, solvent, propellant, antioxidant, reducing agent, oxidizing agent, preservative , Antibacterial agents, chelating agents, pH adjusters, acids, carbonates, alkalis, powders, inorganic salts, UV absorbers, whitening agents, vitamins and their derivatives, anti-inflammatory agents, anti-inflammatory agents, hair growth agents, blood circulation Accelerator, Stimulant, Hormones, Anti-wrinkle agent, Anti-aging agent, Squeeze agent, Cool sensation agent, Warm sensation agent, Wound healing promoter, Stimulation mitigation agent, Analgesic agent, Cell activator, Plant / Animal / Microbe extract , Antipruritic agent, exfoliating / dissolving agent, antiperspirant, refreshing agent, astringent, enzyme, nucleic acid, fragrance, dye, colorant, dye, pigment, metal-containing compound, unsaturated monomer, polyhydric alcohol, high Molecular additives, anti-inflammatory analgesics, antifungal agents, antihistamines, hypnotic sedatives, tranquilizers, Antihypertensive, Antihypertensive diuretic, Antibiotic, Anesthetic agent, Antibacterial agent, Antiepileptic agent, Coronary vasodilator, Herbal medicine, Adjuvant, Wetting agent, Thickener, Tackifier, Antidiarrheal agent, Keratin softening release agent Oily raw materials, UV blockers, antiseptics, anti-oxidants, liquid matrices, fat-soluble substances, polymeric carboxylates, additives, metal soaps, water-absorbing materials, and the like.

  An effect promoter can be mix | blended with the functional substance content layer 100,110,120. Moreover, when a functional sheet is a multilayer structure containing a functional substance containing layer and another layer, it can mix | blend with any one or several layers of several layers.

(Heat seal processing)
Heat sealing is a method in which heat is applied by a heating means such as a heat sealer to bond the layers. In the embodiment of the present invention, for example, a functional substance-containing layer 100 consisting only of a pH indicator and a functional substance is used as an intermediate layer, and another layer 300 containing a heat-fusible resin is disposed on both sides thereof. A functional sheet having a multilayer structure can be formed by heat-sealing the four sides. At least one of the other layers 300 arranged on both surfaces of the functional substance-containing layer has a configuration that allows the user to visually recognize the color change of the functional substance-containing layer through the other layer 300. For example, the other layer 300 may be transparent, translucent, or may have a mesh structure having a mesh size that prevents the constituent material of the functional substance-containing layer from leaking outside. .

(Adhesive layer)
The method for forming the adhesive layer is not particularly limited, but is preferably an adhesive layer obtained by hot melt processing. Hot melt processing is a processing method in which a thermoplastic resin is melted and extruded to bond the sheets. It can be used for interlayer adhesion when the functional substance-containing layer and other layers are bonded.

  Examples of the thermoplastic resin that can be used for hot-melt processing include ethylene / vinyl acetate copolymer (EVA), and resins generally known as hot-melt adhesives can be used.

(Embossing)
Embossing is a process in which heat is applied with a pressing die carved with uneven patterns. This method can also be used for interlayer adhesion of multilayer structures. Moreover, this method can also be used for surface treatment such as unevenness on a functional sheet having a single layer or a multilayer structure.

(Content ratio of ingredients)
The compounding amount of the functional substance in the functional sheet varies depending on the use and the desired effect.

  For example, when the functional sheet is a metal (water) oxide-containing sheet and the functional substance is a metal (water) oxide, it accounts for the total amount of the sheet from the viewpoint of the antibacterial performance of the metal (water) oxide. The amount of the powder is preferably 0.01% by mass or more, more preferably 0.2% by mass or more, further preferably 0.5% by mass or more, and particularly preferably 1% by mass or more. Moreover, from the viewpoint of exhibiting deodorizing properties of the metal (water) oxide, the amount of powder in the total amount of the sheet is preferably 1% by mass or more, although it depends on the type of gas to be deodorized, preferably 3% by mass. More preferably, it is more preferably 5% by mass or more, still more preferably 8% by mass or more, and particularly preferably 10% by mass or more. From the viewpoint of preventing metal (water) oxide from falling off, the amount of the metal (water) oxide powder in the total amount of the metal (water) oxide-containing sheet is preferably 60% by mass or less, and 50% by mass. % Or less is more preferable, and 40% by mass or less is further preferable.

(Basis weight)
The basis weight of the functional sheet can be appropriately set depending on the application. For example, 10 to 4000 g / m ² is preferable, 30 to 3000 g / m ² is more preferable, and 50 to 300 g / m ² is more preferable. When the basis weight is too small, it may be difficult to produce a uniform sheet (nonwoven fabric), and when the basis weight is too large, handling during use may be deteriorated.

(Formation of functional substance-containing layer)
In the present invention, the functional substance-containing layer is a layer provided by a dry method. The dry method that can be used in the present invention includes any non-aqueous layer forming method that does not use water.

(Method of coating the dye solution on the carrier)
A method of applying a dye solution (pH indicator mixed solution) to a carrier that can be applied to the embodiment of the present invention will be described.

  The method for applying a dye (pH indicator) to a functional sheet is roughly divided into the following methods.

  First, there is a method in which a pigment is supported on a component (for example, cellulose fiber or the like) constituting a layer in which a pH indicator is to be blended in a functional sheet (nonwoven fabric) and then formed into a sheet. For example, there is a method of adding a dye solution while stirring cellulose fibers with a mixer or the like to obtain a fiber having a fiber surface coated with the dye solution.

  There is also a method of applying a dye solution to the surface of a sheet (nonwoven fabric) after preparing the sheet (nonwoven fabric). For example, there is a method of coating the sheet surface by spraying a dye solution at the time of forming the nonwoven sheet. In addition to the coating, the dye solution may be applied to the carrier (sheet constituent element) by impregnation.

<Solvent>
Examples of solvents applicable for preparing a dye solution (pH indicator mixed solution) include non-aqueous solvents (organic solvents) such as aromatic hydrocarbons, aliphatic hydrocarbons, esters, and alcohols. . A uniform dye solution can be prepared by dissolving a drug (pH indicator, quaternary ammonium salt, and optionally a binder, etc.) to be a constituent material of the dye solution, and after coating the dye solution on a carrier, A solvent that can be removed by a technique such as vacuum drying is preferred. In particular, alcohols are preferable, and isopropyl alcohol is more preferable.

(Mixing amount)
The blending amount of the dye (pH indicator) varies depending on the dye to be used, but is preferably such an amount that a clear color change is recognized during use. For example, the amount of thymolphthalein is preferably 0.01 to 0.5% (w / w), more preferably 0.02 to 0.1% (w / w) based on the weight of the carrier. In addition, a support | carrier here refers to the component (fiber, powder, etc.) of the functional substance content layer in which the pH indicator is mix | blended among functional sheets.

  The blending amount of the binder is preferably 3% (w / w) or less, more preferably 2% (w / w) or less with respect to the weight of the carrier. If it is added in an amount of more than 3%, the water repellency of the carrier carrying the dye becomes high, the solution hardly penetrates, and the color developability tends to deteriorate.

  The amount of quaternary ammonium is preferably 0.05 to 5% (w / w), more preferably 0.1 to 2%, based on the weight of the carrier. For example, benzalkonium chloride is commercially available from manufacturers in the form of aqueous solutions such as 10% aqueous solution and 50% aqueous solution, but the above figures are the amount of solid content as benzalkonium chloride .

  Said compounding quantity can be optimized according to the compounding quantity of each chemical | medical agent. For example, when 2% (w / w) of the binder is blended with respect to the weight of the carrier, the blending amount of benzalkonium chloride is 0.1 to 0.5% (w / w) with respect to the weight of the carrier. ). Moreover, when not mix | blending a binder, the compounding quantity of benzalkonium chloride has good 0.3-2% (w / w) with respect to the weight of a support | carrier.

  That is, a configuration in which a binder is not blended is also included in the embodiment of the present invention. However, by blending a binder, adhesion of a pH indicator to a carrier can be reinforced, and benzalkonium chloride A compounding quantity can be reduced.

  The blending amount of the solvent is preferably 10 to 100% (w / w), more preferably 15 to 50% (w / w) with respect to the weight of the carrier. When the amount of the solvent is small, the viscosity of the dye solution becomes high and uniform mixing with the carrier becomes difficult. On the other hand, when the amount of the solvent is too large, the treatment time of the drying step after mixing the dye solution and the carrier becomes long, which causes an increase in treatment time and cost.

(Amount of carrier)
The carrier on which the pH indicator I is fixed can be blended in the functional substance-containing layers 100, 110, 120 at an arbitrary ratio. From the viewpoint of the visibility of the color change of the functional sheet, it is preferable that the color change of the pH indicator I can be clearly confirmed.

(Method for producing functional sheet)
For example, when a functional material-containing layer containing a pH indicator and a functional material is produced in a web forming apparatus that employs an airlaid method, and other layers are included, another layer is added to the functional material-containing layer. A manufacturing method of separately laminating can be used. As such a method, there is a method in which a heat-fusible resin B such as polyethylene (PE) is disposed on the surface of the functional substance-containing layer, and the heat-fusible resin B is melted by heat and bonded. . Alternatively, when a functional substance-containing layer (for example, the functional substance-containing layer 120 including the heat-fusible resin A) is produced by a web forming apparatus that employs the airlaid method, the web that becomes the functional substance-containing layer 120 By using another layer 300 of the present invention as a carrier sheet for transporting the layer, a layered body of the other layer 300 and the functional substance-containing layer 120 is formed, and the layer according to the embodiment of the present invention You may obtain the functional sheet which has a structure. Moreover, you may join each layer of the functional sheet produced separately by embossing or heat seal processing. There is also a method in which an adhesive layer (adhesive layer) is provided on at least one of the bonding surfaces of each layer of the functional sheet with a hot melt adhesive such as a thermoplastic resin, and the layers are bonded by hot melt processing. In order to prevent contact and dissolution of the functional substance with water during production, in the present invention, these laminations are performed by a dry method (non-aqueous system).

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention more concretely, this invention is not limited to a following example.

[Example 1]
<Preparation of dye solution>
50 g of a 2% thymolphthalein solution, 10 g of a 50% benzalkonium chloride aqueous solution and 40 g of polyvinyl butyral were dissolved in isopropanol, and the volume was increased with isopropanol on a mass / mass basis so that the total amount became 500 g. A mixed solution was prepared by mixing until the polyvinyl butyral was completely dissolved, and a dye solution C1 was obtained.

<Coating of dye solution on carrier>
While stirring the powdered cellulose fiber (fiber length: 0.2 mm) with a mixer, the dye solution C1 was added and stirred until the fibers and the dye solution were uniformly mixed. Subsequently, it was made to dry at 105 degreeC for 2 hours conditions with the dryer, the solvent was removed, and the powder-form pigment coating cellulose fiber (fiber length 0.2mm) was obtained.

<Sheet>
Short-cut polyethylene (PE) heat-fusible fiber (hereinafter also referred to as PE fiber) and short-cut polyethylene terephthalate (PET) fiber (hereinafter also referred to as PET fiber) are defibrated, respectively. I got a shortcut fiber.

  Polyethylene (PE) powder (hereinafter also referred to as PE powder), scallop shell baked product (Unisera Corporation scallop shell baked powder; hereinafter also referred to as calcium oxide), and powdered pigment-coated cellulose fiber (fiber length) 0.2 mm) was mixed at a ratio (mass ratio) of 4/1/20 to prepare a powder mixture of PE powder, calcium oxide, and dye-coated cellulose fibers.

  Next, a PE fiber defibration shortcut fiber, a PET fiber defibration shortcut fiber, and a particle mixture of PE powder / calcium oxide / dye-coated cellulose fiber at a ratio (mass ratio) of 40/40/20 The web raw material containing PE / PET / dye-coated cellulose fiber / calcium oxide was obtained by uniformly mixing by air flow.

  Using a web forming apparatus, a non-woven sheet having a single layer structure was formed from the web raw material.

<Evaluation test>
(Confirmation of color development)
The formed sheet was cut into a size of 5 cm × 5 cm square, and color development and pH when water of 5 times the sheet weight was included were confirmed.

  The color of the sheet before including water was white. The part containing water quickly developed blue. The pH of the water contained in the sheet at this time was 12.0.

[Example 2]
<Preparation of dye solution>
50 g of a 2% thymolphthalein solution and 20 g of a 50% benzalkonium chloride aqueous solution were dissolved in isopropanol and diluted with isopropanol on a mass / mass basis so as to be 500 g. The mixture was mixed until the polyvinyl butyral was completely dissolved to prepare a dye solution C2.

  Otherwise, the same method as in Example 1 was used to carry out <coating of the dye solution on the carrier> and <sheeting> to form a single-layer nonwoven fabric sheet.

<Evaluation test>
(Confirmation of color development)
The formed sheet was cut into a size of 5 cm × 5 cm square, and color development and pH when water of 5 times the sheet weight was included were confirmed.

  The color of the sheet before including water was white. The part containing water quickly developed blue. The pH of the water contained in the sheet at this time was 12.0.

[Example 3]
<Preparation of dye solution>
In the same manner as in Example 2, a dye solution C2 was prepared.

<Sheet>
Fibers obtained by defibrating the flap pulp and defibrated shortcut fibers obtained by defibrating each of the shortcut polyethylene (PE) heat-fusible fiber and the shortcut polyethylene terephthalate (PET) fiber were obtained.

  Polyethylene (PE) powder and burned scallop shell (calcium oxide) were mixed at a ratio (mass ratio) of 4/1 to prepare a particle mixture of PE powder and calcium oxide.

  Next, a fluff pulp defibration fiber, a PE fiber defibration shortcut fiber, a PET fiber defibration shortcut fiber, and a particle mixture of PE powder and calcium oxide are prepared as 70/15/15/5. The web raw material containing fluff pulp / PE / PET / calcium oxide was obtained by uniformly mixing at a ratio (mass ratio) by an air flow.

  Using a web forming apparatus, a non-woven sheet having a single layer structure was formed from the web raw material.

<Coating of dye solution on carrier>
The dye solution was uniformly sprayed on the formed sheet by a spray to adhere the dye. As the dye solution to be sprayed, 50 g of 100 g of the nonwoven fabric sheet was used. The non-woven fabric after spray spraying was dried with a dryer at 105 ° C. for 2 hours to remove the solvent.

<Evaluation test>
(Confirmation of color development)
The formed sheet was cut into a size of 5 cm × 5 cm square, and color development and pH when water of 5 times the sheet weight was included were confirmed.

  The color of the sheet before including water was white. The part containing water quickly developed blue. The pH of the water contained in the sheet at this time was 12.0.

(Check color transfer)
Next, the white plastic sheet was wiped with the colored sheet, and the color transfer was visually confirmed. Here, “color transfer” means that a coloring matter that is a coloring component of a sheet elutes out of the sheet and moves to a plastic sheet. The degree of color transfer is an indicator of how firmly the dye is fixed to the sheet. The smaller the degree of color transfer, the more preferable it can be said that the dye is more firmly fixed to the sheet. More preferably, the color transfer cannot be confirmed.

  The color transfer could not be confirmed.

[Comparative Example 1]
<Preparation of dye solution>
50 g of a 2% thymolphthalein solution and 40 g of polyvinyl butyral were dissolved in isopropanol and diluted with isopropanol on a mass / mass basis so as to be 500 g. The mixture was mixed until the polyvinyl butyral was completely dissolved to prepare a dye solution R1.

  <Coating of dye solution on carrier> and <sheeting> were carried out in the same manner as in Example 1 to form a nonwoven sheet having a single layer structure.

<Evaluation test>
(Confirmation of color development)
The formed sheet was cut into a size of 5 cm × 5 cm square, and color development and pH when water of 5 times the sheet weight was included were confirmed.

  The color of the sheet before including water was white. The part containing water quickly developed blue. The pH of the water contained in the sheet at this time was 12.0.

(Check color transfer)
Next, the white plastic sheet was wiped with the colored sheet, and the color transfer was visually confirmed.

  The blue solution eluted from the sheet, and color transfer was confirmed.

[Comparative Example 2]
<Preparation of dye solution>
50 g of a 2% thymolphthalein solution, 10 g of a 50% benzalkonium chloride aqueous solution and 40 g of a water-soluble polymer compound, polyvinylpyrrolidone, were dissolved in isopropanol and diluted with isopropanol on a mass / mass basis to 500 g. The mixture was mixed until the polyvinylpyrrolidone was completely dissolved to prepare a dye solution R2.

<Coating of dye solution on carrier> and <sheeting> were carried out in the same manner as in Example 1 to form a nonwoven sheet having a single layer structure.

<Evaluation test>
(Confirmation of color development)
The formed sheet was cut into a size of 5 cm × 5 cm square, and color development and pH when water of 5 times the sheet weight was included were confirmed.

  The color of the sheet before including water was white. The part containing water quickly developed blue. The pH of the water contained in the sheet at this time was 12.0.

(Check color transfer)
Next, the white plastic sheet was wiped with the colored sheet, and the color transfer was visually confirmed.

  The blue solution eluted from the sheet, and color transfer was confirmed.

  As described above, in Examples 1 to 3 including a pH indicator, a functional substance (calcium oxide), and a quaternary ammonium salt, all exhibit an alkaline pH by adding water, and are clearly Color change (color development) was observed. In addition, as for Example 3 in which no binder was blended, no color transfer after color development was observed.

  On the other hand, in the example in which the quaternary ammonium salt was not blended as in Comparative Example 1, although alkaline pH was exhibited by applying water and a clear color change (color development) was observed, Color transfer was seen. Even in the case where the water-insoluble polymer was not blended and the water-soluble polymer was blended as in Comparative Example 2, a clear color change (color development) was observed, but a color transfer after the color development was observed.

  As described above, according to the embodiment of the present invention, the functional substance contained in the functional sheet exhibits a function due to the reaction via the imparted water, and at that time, the hydrogen ion concentration in the water changes. Arise. The pH indicator contained in the functional sheet is colored (colored) or discolored according to the change in the hydrogen ion concentration, thereby changing the color of the functional sheet. The user can recognize that the functional sheet is functioning. Therefore, the user can use the functional sheet while the functional sheet is functioning.

  The present invention can also be applied to visually recognizing that the functional sheet has performed its function by changing the color of the functional sheet according to the pH change. According to this, the user can easily determine the use end time of the functional sheet.

Hereinafter, preferred embodiments of the present invention will be exemplified.
1. A functional sheet comprising a layer containing a pH indicator, a functional substance, and a carrier, wherein the pH indicator is fixed to the carrier by a quaternary ammonium salt.
2. Further comprising a binder, wherein the pH indicator is fixed to the carrier by the quaternary ammonium salt and the binder. Functional sheet described in 1.
3. The layer includes fibers, and the carrier in which the pH indicator is fixed and the functional substance are held in voids formed by the fibers. Or 2. Functional sheet described in 1.
At this time, the carrier may be a fiber constituting at least a part of the fiber included in the layer. At this time, the pH indicator in a form fixed to the carrier (fiber) and the functional substance may be held in the void formed by the fiber.
4). The layer includes a heat-fusible resin, and a part of the carrier on which the pH indicator is fixed is fixed in a state of being covered with the heat-fusible resin. The functional sheet according to any one of 1 to 3.
5. The adjacent layer adjacent to the layer contains a heat-fusible resin, and is fixed in a state where a part of the carrier to which the pH indicator existing in the layer is fixed is covered with the heat-fusible resin. It is characterized by the following: To 4. The functional sheet in any one of.
6). The quaternary ammonium salt is at least one selected from the group consisting of benzylzirconium chloride, cetylpyridinium chloride, benzethonium chloride, and didecyldimethylammonium salt. To 5. The functional sheet in any one of.
7). The carrier for fixing the pH indicator is cellulose and / or a cellulose derivative. To 6. The functional sheet according to any one of the above.
8). 1. The binder is a water-insoluble polymer compound. To 7. The functional sheet in any one of.
9. The functional substance is a metal oxide and / or a metal hydroxide. To 8. The functional sheet in any one of.
10. The functional substance is cyclodextrin. To 8. The functional sheet in any one of.
11. The functional substance is a carbon dioxide gas generating agent. To 8. The functional sheet in any one of.
12 1. To 11. A method for producing a functional sheet according to any one of
Dissolving the pH indicator, the quaternary ammonium salt, and the binder in a non-aqueous organic solvent;
Applying the solution obtained by the step to the carrier;
A method for producing a functional sheet, comprising:
13. Further comprising the step of forming the carrier into a sheet,
The step of applying is performed before the step of forming the sheet. The manufacturing method as described in.
14 Further comprising the step of forming the carrier into a sheet,
The step of applying is performed after the step of forming the sheet. The manufacturing method as described in.

DESCRIPTION OF SYMBOLS 1 Web forming apparatus 30 Web raw material supply means 41 The 1st carrier sheet 51 The 2nd carrier sheet A The heat sealing resin B The heat sealing resin D Functional substance F Fiber I pH indicator W Airlaid web 100 Functional substance containing Layer 110 Functional material-containing layer 120 containing fibers Functional material-containing layer 200 containing heat-fusible resin A Layer 300 containing heat-fusible resin B Other layers 500 Adhesive layer

Claims (14)

  A functional sheet comprising a layer containing a pH indicator, a functional substance, and a carrier, wherein the pH indicator is fixed to the carrier by a quaternary ammonium salt.   The functional sheet according to claim 1, further comprising a binder, wherein the pH indicator is fixed to the carrier by the quaternary ammonium salt and the binder.   The said layer contains a fiber, The said support | carrier to which the said pH indicator was fix | immobilized and the said functional substance are hold | maintained in the space | gap formed with the said fiber, The said functional substance is characterized by the above-mentioned. Functional sheet described in 1.   The layer includes a heat-fusible resin, and a part of the carrier on which the pH indicator is fixed is fixed in a state of being covered with the heat-fusible resin. The functional sheet according to any one of 1 to 3.   The adjacent layer adjacent to the layer contains a heat-fusible resin, and is fixed in a state where a part of the carrier to which the pH indicator existing in the layer is fixed is covered with the heat-fusible resin. The functional sheet according to any one of claims 1 to 4, wherein the functional sheet is characterized.   The quaternary ammonium salt is at least one selected from the group consisting of benzylzirconium chloride, cetylpyridium chloride, benzethonium chloride, and didecyldimethylammonium salt. The functional sheet according to any one of the above.   The functional sheet according to any one of claims 1 to 6, wherein the carrier for fixing the pH indicator is cellulose and / or a cellulose derivative.   The functional sheet according to any one of claims 2 to 7, wherein the binder is a water-insoluble polymer compound.   The functional sheet according to any one of claims 1 to 8, wherein the functional substance is a metal oxide and / or a metal hydroxide.   The functional sheet according to claim 1, wherein the functional substance is cyclodextrin.   The functional sheet according to any one of claims 1 to 8, wherein the functional substance is a carbon dioxide gas generator. It is a manufacturing method of the functional sheet according to any one of claims 1 to 11,
Dissolving the pH indicator and the quaternary ammonium salt in a non-aqueous organic solvent;
Applying the solution obtained by the step to the carrier;
A method for producing a functional sheet, comprising: Further comprising the step of forming the carrier into a sheet,
The manufacturing method according to claim 12, wherein the applying step is performed before the sheet forming step. Further comprising the step of forming the carrier into a sheet,
The manufacturing method according to claim 12, wherein the applying step is performed after the forming step.

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