JP6953855B2 - Functional sheet and its manufacturing method - Google Patents

Description

The present invention relates to a functional sheet, and more particularly to a functional non-woven fabric sheet containing a functional substance that exerts its function by a reaction mediated by water and a method for producing the same.

Functional articles such as sheets and particles that exert their functions by a reaction mediated by water are conventionally known. For example, Patent Document 1 discloses an antibacterial nanofiber non-woven fabric using calcium oxide powder as an antibacterial agent. When water is applied to this non-woven fabric, the calcium oxide powder reacts with water to exhibit alkalinity and exert an antibacterial effect.

However, in the non-woven fabric of Patent Document 1, when water is applied and a lapse of time elapses, the reaction ends and the antibacterial effect may not be exhibited. Then, even if the user continues to use the non-woven fabric, the desired antibacterial effect cannot be obtained.

On the other hand, Patent Document 2 discloses an antibacterial agent sheet using calcium hydroxide as an antibacterial agent. Reference 2 discloses a configuration in which a mixture containing an antibacterial agent, a pH indicator, and an excipient is formed and the surface thereof is coated. Then, we propose a configuration in which the antibacterial effect of the antibacterial agent is visually confirmed by the pH change of the solution due to the pH indicator.

Japanese Unexamined Patent Publication No. 2012-246595 Japanese Unexamined Patent Publication No. 2011-37801

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 having a structure different from that of Patent Document 2, which can easily recognize whether or not the function is being exerted, and which exerts a function by a reaction via water. To do.

Specific embodiments of the present invention for solving the above problems are as follows.
[1] A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is a metal oxide. A functional sheet featuring.
[2] A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is cyclodextrin. A featured functional sheet.
[3] A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is a carbon dioxide gas generator. A functional sheet that features that.
[4 ] Any one of claims 1 to 3 , further comprising a binder, wherein the pH indicator is immobilized on the carrier by the quaternary ammonium salt and the binder. The functional sheet described in the section.
[5] The functional sheet according to claim 4, wherein the binder is a water-insoluble polymer compound.
[ 6 ] The claim is characterized in that the layer contains fibers, and the carrier on which the pH indicator is fixed and the functional substance are retained in the voids formed by the fibers. The functional sheet according to any one of 1 to 5.
[ 7 ] The layer contains a heat-sealing resin, and a part of the carrier on which the pH indicator is fixed is fixed in a state of being coated with the heat-sealing resin. , The functional sheet according to any one of claims 1 to 6.
[ 8 ] The adjacent layer adjacent to the layer contains a heat-sealing resin, and a part of the carrier on which the pH indicator present in the layer is fixed is fixed in a state of being coated with the heat-sealing resin. The functional sheet according to any one of claims 1 to 7, wherein the functional sheet is provided.
[ 9 ] The quaternary ammonium salt is at least one selected from the group consisting of benzylzyl chloride, cetylpyridium chloride, benzethonium chloride, and didecyldimethylammonium salt. The functional sheet according to any one of 8 to 8.
[ 10 ] The functional sheet according to any one of claims 1 to 9 , wherein the carrier for fixing the pH indicator is cellulose and / or a cellulose derivative.
[11 ] The method for manufacturing a functional sheet according to any one of claims 1 to 10.
A step of dissolving the pH indicator and the quaternary ammonium salt in a non-aqueous organic solvent, and
A step of applying the solution obtained by the above step to the carrier, and a step of applying the solution to the carrier.
A method for manufacturing a functional sheet, which comprises.
[ 12 ] The step of forming the carrier into a sheet is further included.
The manufacturing method according to claim 11 , wherein the imparting step is performed before the sheet-forming step.
[ 13 ] The step of forming the carrier into a sheet is further included.
The manufacturing method according to claim 11 , wherein the imparting step is performed after the sheet-forming step.

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 exerts its function due to the reaction through the water, and at that time, the water There is a change in the hydrogen ion concentration in. The pH indicator contained in the functional sheet changes color (color development) or discolors according to the change in the hydrogen ion concentration, thereby changing the color of the functional sheet. The user can visually recognize that the functional sheet is performing its function and that the functional sheet has finished functioning after that by changing the color of the functional sheet.

Therefore, the user can use the functional sheet while the functional sheet is exerting its function, and can easily determine when to end the use of the functional sheet.

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

The configuration of the functional sheet (nonwoven fabric) according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing the configuration of a functional sheet according to an embodiment of the present invention not for a limited purpose but for an exemplary purpose. In the figure, the same reference numerals indicate the same components. Duplicate description may be omitted for the same component.

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

The functional sheet according to the embodiment of the present invention may have a single-layer structure as described above, or may have a two-layer, three-layer, or a multi-layer structure of four or more layers (not shown). .. The functional sheet may contain two or more functional substance-containing layers 100. The other layer 300 is arranged for the purpose of imparting some functionality to the functional sheet, for example, for the purpose of modifying the surface of the functional sheet, for the purpose of imparting strength (rigidity) to the functional sheet, or the like. be able to. For the other layer 300, for example, a sheet such as cloth, non-woven fabric, paper, or film can be used. The other layer 300 may contain a heat-sealing resin. When the functional sheet comprises a plurality of layers 300, these layers 300 may be the same material or different materials.

However, in the functional sheet according to the embodiment of the present invention, the status of whether or not the function is being exerted is visually recognized by the color change of the sheet brought about by the pH indicator contained in the functional substance-containing layer 100. Will be done. Therefore, the functional sheet according to the embodiment of the present invention may have a structure in which the functional substance-containing layer 100 is the outermost layer, or even if the outermost layer is a layer 300 other than the functional substance-containing layer 100. It has a configuration in which 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 can contain a pH indicator I and a functional substance D. Here, the pH indicator I is blended into the functional substance-containing layer in a form fixed on a carrier, as will be described later. That is, the functional substance-containing layer 100 contains, in addition to the pH indicator I and the functional substance D, a carrier on which the pH indicator I is immobilized.

Hereinafter, in the present specification, when referring to the configuration in which "the pH indicator is contained in the functional sheet", unless otherwise specified, "the pH indicator is contained in a form fixed to a carrier". It is assumed that the configuration is intended. When "the pH indicator is contained in a form fixed on the carrier", it goes without saying that the entire amount of the pH indicator contained in the functional sheet may be fixed on the carrier, but not necessarily the whole amount. Does not have to be fixed to the carrier. That is, the functional sheet may contain a pH indicator that is not immobilized on the carrier. The pH indicator I and the functional substance D can each contain one type, and the functional substance D is not limited to this, and a plurality of types are contained in the same layer and / or different layers of the functional sheet. Can be done. The types of the pH indicator I and the 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-sealing resin, an effect promoter, and the like. The fiber, the heat-sealing resin, and the effect accelerator may be one kind or a plurality of kinds, respectively.

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

(First aspect)
FIG. 1D is an example in which the functional substance-containing layer 100 contains the fiber F. In the functional substance-containing layer 110 containing the fiber 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, thereby. Powder falling 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. Further, the functional substance-containing layer 110 containing fibers may contain a heat-sealing resin, an effect accelerator, and the like in addition to the pH indicator I, the functional substance D, and the fibers F. Further, the fiber F itself may be a heat-sealing resin.

In this embodiment, in the functional sheet, the other layer 300 is 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 imparting strength (rigidity). It may have a multi-layer structure (not shown).

However, as described above, whether or not the functional sheet according to the embodiment of the present invention is exerting its function due to the color change of the sheet brought about by the pH indicator contained in the functional substance-containing layer 100. The status is recognized. Therefore, the functional sheet according to this embodiment has a structure in which the functional substance-containing layer 110 containing fibers is the outermost layer, or a layer 300 other than the functional substance-containing layer 110 containing fibers as the outermost layer. Also has a structure in which the color of the functional substance-containing layer 110 containing fibers can be recognized via another layer 300.

(Second aspect)
FIG. 1 (e) shows an example in which the functional substance-containing layer 100 contains the heat-sealing resin A. The functional substance-containing layer 120 containing the heat-sealing resin melts the heat-sealing resin A in the mixture containing the pH indicator I, the functional substance D, and the heat-sealing resin A. It was 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) in a state of being partially coated with the heat-sealing resin A.

In the functional substance-containing layer 120 containing the heat-sealing resin, the pH indicator I and the functional substance D are fixed in a partially coated state when the melted heat-sealing resin A solidifies. This prevents powder from falling off. Further, the heat-sealing resin A is blended in an amount that does not cover the entire pH indicator I and the functional substance D, and the pH indicator I and the functional substance D are coated with the heat-sealing resin A. It has an unfinished part, which guarantees contact and elution with water when using the sheet.

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

In this embodiment, the functional sheet is a layer 300 on one side or both sides of the functional substance-containing layer 120 containing a heat-sealing resin for the purpose of imparting functionality such as surface modification and imparting strength (rigidity). May have a multi-layer structure (not shown) in which is laminated.

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

(Third aspect)
FIG. 1 (f) shows an example in which the layer adjacent to the functional substance-containing layer 100 contains the heat-sealing resin B. In the layer 200 containing the heat-sealing resin B adjacent to the functional substance-containing layer 100, the heat-sealing resin B is arranged on the surface of the functional substance-containing layer 100 to heat the heat-sealing resin B. 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 coated with the heat-sealing resin B. The heat-sealing resin A contained in the layer 120 and the heat-sealing 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-sealing resin B melted in the layer 200 containing the heat-sealing resin B adjacent thereto solidifies. By being fixed, powder falling is prevented. Further, the functional substance D has a portion not covered with the heat-sealing resin B, and contact and elution with water when the sheet is used are guaranteed.

The layer 200 containing the heat-sealing resin B can contain only the heat-sealing resin B. Further, the layer 200 containing the heat-sealing resin B may contain fibers, an effect accelerator, and the like in addition to the heat-sealing resin B. When these other components are contained, the layer 200 containing the heat-sealing resin B is heated by arranging a mixture of the heat-sealing resin B and these other components on the surface of the functional substance-containing layer 100. It can be obtained by melting the heat-sealing resin B.

In detail, the functional sheet of the example shown in FIG. 1 (f) includes a layer 200 containing a heat-sealing resin B, a functional substance-containing layer 100 composed of a pH indicator I and a functional substance D, and a pH indicator. It has a three-layer structure including I, a functional substance D, and a functional substance-containing layer 120 containing a heat-sealing resin A. In the case of this example, the functional substance-containing layer 120 can also contribute to the prevention of powdering of the pH indicator I and the functional substance contained in the functional substance-containing layer 100 positioned as an intermediate layer.

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

Further, although both the layer 100 and the layer 120 are illustrated and described as containing the pH indicator I and the functional substance D, the pH indicator I is contained in only one of the layer 100 and the layer 120. It may be. From the viewpoint of 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 embodiment, the layer 200 containing the heat-sealing resin B may be provided on both sides of the functional substance-containing layer. That is, for example, the configuration (not shown) including the layer 200 containing the heat-sealing resin B, the functional substance-containing layer, and the layer 200 containing the heat-sealing resin B in this order is the present embodiment. The range.

In this embodiment, the functional sheet is an outer surface of a laminated body of a layer 200 containing a functional substance-containing layer and a heat-sealing resin B for the purpose of imparting functionality such as surface modification and imparting strength (rigidity). It may have a multi-layer structure (not shown) in which the other layer 300 is laminated on one side or both sides of the layer. In that case, the other layer 300 adopts a configuration that does not interfere with the visibility 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 one example, FIG. 1 (g) shows a configuration in which another layer 300 containing a heat-sealing resin is laminated on both sides of the functional substance-containing layer 100, and the four sides are heat-sealed. At least one of the other layers 300 has a structure in which the color of the functional substance-containing layer 100 can be recognized 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 arranging the 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 pH indicator I and the functional substance D contained in the functional substance-containing layer 100 from falling off, but for example, a hot melt adhesive. And so on.

Specifically, the functional sheet of the example shown in FIG. 1 (h) is 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. It has a structure in which layers are bonded 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 the heat fusion are formed on the surface of the functional substance-containing layer 100 opposite to the adhesive layer 500. It has a functional substance-containing layer 120 containing the sex resin A. In the functional sheet of the example shown in FIG. 1 (h), the functional substance-containing layer 120 containing the heat-sealing resin A is positioned as an intermediate layer as in the case of the example shown in FIG. 1 (f). It can contribute to the prevention of powder falling off of the pH indicator I and the functional substance D contained in the functional substance-containing layer 100. Further, here, the functional substance-containing layer 100 and the functional substance-containing layer 120 containing the pH indicator I, the functional substance D and the heat-sealing resin A are illustrated and described as separate layers, and these two layers have been illustrated and described. The layers are integrally formed, and the constituent materials, the pH indicator I, the functional substance D, and the heat-sealing resin A, form a single functional substance-containing layer 120 that is unevenly distributed in the thickness direction. The configuration is also included in this aspect. According to this aspect, in particular, when the powdery material is unevenly distributed on one surface side of the functional substance-containing layer 120, the powder removal is effective by arranging the layer 200 adjacent to the surface. Can be prevented.

Further, although the pH indicator I and the functional substance D are illustrated and described as being contained in both the outermost layer 120 and the innermost layer 100, the pH indicator I has been illustrated and described. May be contained in only one of them. From the viewpoint of 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 embodiment of the present invention described above may be formed by embossing. As one example, FIG. 1 (i) shows a structure in which another layer 300 is laminated on both sides of a functional substance-containing layer 120 containing a heat-sealing resin A and laminated by embossing. At least one of the other layers 300 has a structure in which the color of the functional substance-containing layer 100 can be recognized through the other layer 300.

The configuration of the functional sheet of the present invention has been described above with reference to FIGS. 1 (a) to 1 (i). However, these are examples, and other configurations, for example, combinations of the illustrated modes, are also included in the scope of the present invention. For example, the layer shown as the functional substance-containing layer 100 in the drawing may be the functional substance-containing layer 110 containing the fiber F or the functional substance-containing layer 120 containing the heat-sealing resin A, or , Fiber F and heat-sealing resin A may be included in the layer. Similarly, a configuration in which layers are replaced between these layers is included in the scope of the present invention.

The details of the components of the functional sheet according to the present invention will be described below.

<Functional sheet (nonwoven fabric)>
The functional sheet according to the 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 with a quaternary ammonium salt. It is a functional sheet characterized by being contained in the layer in the form of the above.

The "sheet" can also be expressed as a "nonwoven fabric sheet" or simply a "nonwoven fabric". That is, it can be said that the sheet according to the embodiment of the present invention is a non-woven fabric having 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 production method, and is preferably a non-woven 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 the present specification, the layer containing a functional substance is also referred to as a layer containing a functional substance. 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, fibers, a heat-sealing 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 substance>
The functional substance D used in the embodiment of the present invention is a substance that exerts its function in contact with water or a substance that exerts its function by a reaction through water.

Non-limiting examples of functional substances include metal oxides and / or metal hydroxides, cyclodextrins, carbon dioxide generators and the like. Further, not limited to these, a substance that exerts its function in contact with water or a substance that can exert its function by a reaction via water can be used as the functional substance according to the embodiment of the present invention. can.

(Metal oxides and / or metal hydroxides)
(Metal oxide)
The metal oxide that can be used in the embodiment of the present invention is a metal oxide that becomes a strong alkali when it comes into contact with water, preferably a divalent metal oxide, and more preferably Group 2 of the periodic table. It is an oxide of an elemental metal, more preferably a metal oxide represented by MO (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 the application and the desired effect. For example, in applications in 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 embodiments of the present invention is a metal hydroxide that becomes a strong alkali in contact with water, preferably a divalent metal hydroxide, and more preferably a periodic table. Table 2 is a metal hydroxide and a metal hydroxide, more preferably _{a metal hydroxide represented by M (OH) 2} (where M is Mg, Ca, Sr or Ba), and is particularly preferable. Is a hydroxide of alkaline earth metals. As non-limiting examples, 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 the application and the desired effect. For example, in applications in 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.

As described above, the layer containing the metal component is the layer containing the metal oxide and / the metal hydroxide, and the metal component constituting the metal oxide and / the metal hydroxide is the metal oxidation. A metal component that causes a substance and / metal hydroxide to come into contact with water and become a strong alkali. The metal component is preferably a divalent metal, more preferably a metal of a Group 2 element of the periodic table, and even more preferably a metal represented by M (where M is Mg, Ca, Sr or Ba). Yes, particularly preferably alkaline earth metals.

The metal oxides and / or metal hydroxides that can be used in the embodiments of the present invention are used in the form of powders (particles). Metal oxides and / or metal hydroxides in the form of powders (particles) can be obtained by any method known in the art or can be purchased for sale from manufacturers. For example, in the case of calcium oxide, Okhotsk calcium manufactured by Natural Japan Co., Ltd., calcined scallop shell powder manufactured by Unicera Co., Ltd., and the like can be preferably used. Further, for example, in the case of calcium hydroxide, scallow (registered trademark) manufactured by Antibacterial Research Institute Co., Ltd. and sold by Ryoe Chemical Co., Ltd. can be preferably used. In the case of calcium oxide or calcium hydroxide, calcium (calcium carbonate) obtained from scallop shells can be preferably used as the calcium raw material, but the present invention is not limited to this, and shells of other shellfish (for example, oysters). It may be obtained from calcium shells, etc.), animal bones (eg, oyster shells, etc.), minerals, and the like.

The average particle size of the metal oxide and / or metal hydroxide powder (particles) is not limited, but is preferably 1 to 1000 μm, more preferably 2 to 800 μm. If the average particle size is too small, there is a concern that the sheet (nonwoven fabric) may fall off or the work efficiency may decrease due to scattering in the manufacturing process. Further, if the average particle size is too large, it may be difficult to uniformly mix the non-woven fabric with the entire non-woven fabric.

(Cyclodextrin)
Cyclodextrin, also called cyclodextrin or cyclic oligosaccharide, has the ability to incorporate (encapsulate) various molecules as guests into cavities to form inclusion complexes, and the ability to slowly release the incorporated guest molecules. Cyclodextrin The number of glucose groups contained in one molecule is 6 α-cyclodextrin, 7 β-cyclodextrin, and 8 γ-cyclodextrin, all of which are compatible with the functional components to be included. Can be used in consideration of. Cyclodextrin may be chemically modified such as methylation, hydroxylation, and acetylation. In addition, cyclodextrin may have a branch. These cyclodextrins can be used alone or in combination in the embodiments of the present invention.

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

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

Extraction of functional ingredients such as wasabi ingredient, mustard ingredient, chili pepper ingredient, ginger ingredient, lemon ingredient, orange ingredient, grapefruit ingredient, yuzu ingredient, ume ingredient, matcha ingredient, almond ingredient, natural meat flavor, rose, herb, etc. Examples thereof include natural antibacterial agents or fragrances such as ingredients, plant extracts and tea extracts, natural or organic volatile antibacterial agents or fragrances such as l-menthol ingredients, and cosmetic raw materials such as coenzyme Q10 and isoflavone.

In addition to the 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 their derivatives, anti-inflammatory agents, anti-inflammatory agents, hair growth agents, blood circulation promoters, stimulants, hormones, anti-wrinkle agents, anti-aging agents, tightening agents, cold sensation agents, warming agents, wounds Healing promoters, stimulants, painkillers, cell activators, plant / animal / microbial extracts, antipruritics, keratin exfoliating / dissolving agents, antiperspirants, refreshing agents, astringents, fragrances, pigments, coloring agents, anti-inflammatory analgesics Agents, antifungal agents, antihistamines, hypnotic antipruritics, tranquilizers, antihypertensive agents, antihypertensive diuretics, antibiotics, anesthetics, antibacterial agents, antiepileptic agents, coronary vasodilators, crude drugs, adjuvants, wetting agents , Antipruritics, keratin softening and stripping agents, antiseptic and bactericidal agents, fat-soluble substances, deodorant components and other known compounds can be arbitrarily selected according to the application and purpose.

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

(Cyclodextrin with functional ingredients included)
In embodiments of the present invention, cyclodextrin encapsulated with functional ingredients is used in the form of powder (particles). Cyclodextrins in the form of powders (particles) containing functional ingredients can be obtained by any method known in the art or can be purchased from manufacturers for sale. For example, Dixie Ace (a product using cyclodextrin) manufactured by Shiomizu Port Sugar Co., Ltd., CAVAMAX (registered trademark) manufactured by Cyclochem Co., Ltd., and the like can be preferably used. These cyclodextrins in the form of powder (particles) in which the functional component is encapsulated include the cyclodextrin in which the functional component is encapsulated and the cyclodextrin in which the functional component is not encapsulated. Cyclodextrin may be included.

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

(Carbonates and / or bicarbonates)
When used as a cosmetic, the carbonate or bicarbonate can be used without any particular limitation as long as it is of a grade that can be used in cosmetics, and when used for other purposes, no particular grade is specified. For example, sodium carbonate, sodium hydrogencarbonate, sodium sesquicarbonate, potassium carbonate, potassium hydrogencarbonate, 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, preferably in the form of particles, for example. The carbonate and / or bicarbonate may be supported on a carrier such as silica. Further, the carbonate and / or bicarbonate may contain water as water of crystallization. When water of crystallization is contained, the solubility in water is increased 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 deterioration such as hydrolysis and reaction with 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 particles are less likely to fall off, and a good feeling of use can be obtained with an appropriate graininess.

(acid)
As for the acid, when it is used as a cosmetic, it can be used without any particular limitation as long as it is of a grade that can be used in cosmetics, and when it is used for other purposes, no special grade is specified. 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 produce an acid, and the like can be used. Two or more kinds of acids may be used in combination. The acid is a solid composition, preferably in the form of particles, for example. Further, the acid may contain water as water of crystallization. When water of crystallization is contained, the solubility in water is increased 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 deterioration 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 particles are less likely to fall off, and a good feeling of use can be obtained with an appropriate graininess. When the average particle size is reduced, the dissolution rate becomes faster, and the reaction proceeds immediately after wetting with water, so the _{amount of CO 2} gas generated at the initial stage of use increases.

Further, when used on the skin, the graininess can be reduced. On the other hand, when the average particle size is increased, the dissolution gradually progresses when it comes into contact with water, which has the effect of prolonging the duration of carbon dioxide gas generation. In addition, increasing the average particle size has the effect of reducing particle shedding.

<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 a solution and changes its color tone according to the hydrogen ion concentration.

Examples of pH indicators applicable to embodiments of the present invention are methyl violet, thymol blue, congo red, methyl yellow, bromothymol blue (also referred to as bromothymol blue), methyl red, methyl orange, litmus, bromocresol. Synthetic pigments such as purple (also called bromcresol purple), phenol red, phenolphthalein, cresolphthalein, thymolphthalein, alizarin yellow R, and eriochrome black T can be mentioned. 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 and natural dyes are generally known and can be purchased for sale from the manufacturer. In the present specification, the pH indicator is also simply referred to as a dye.

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

<Carrier>
The carrier is a substance that serves as a base for fixing the pH indicator to the functional sheet (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 non-woven fabric sheet is a structure composed of fibers, the pH indicator may be fixed to the non-woven fabric sheet using such fibers as a carrier. Alternatively, the pH indicator may be fixed to the non-woven fabric sheet by using a component other than the fiber, for example, a particulate matter as a carrier, and holding the carrier in the voids in the fiber structure formed by the fiber. Alternatively, it may be both.

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

Pulp is an aggregate of cellulose fibers extracted from wood or other plants by mechanical or chemical treatment. Plants, especially their cell walls, generally contain cellulose and hemicellulose as constituents as water-insoluble polysaccharides. Of these, cellulose is a _{polysaccharide (carbohydrate) represented by the 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 contain cellulose as a main component and consist only of cellulose, or may contain cellulose and hemicellulose.

The pulp may be wood pulp obtained from wood raw materials such as softwood and hardwood, 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 subjecting wood chips to a treatment such as kraft cooking, but the production method is not limited to this, and wood pulp produced by a known method is an embodiment of the present invention. Included in the examples of carriers applicable to the form of.

The microcrystalline cellulose is obtained by hydrolyzing pulp to remove the amorphous region, and the main component is crystalline cellulose.

Ion-exchanged cellulose is obtained by introducing a positively or negatively charged group into cellulose to give it properties as an ion exchanger. Examples of ion-exchanged cellulose include diethylaminoethyl cellulose, carboxymethyl cellulose (CMC), phosphocellulose and the like.

The cellulose derivative is a polymer compound in which cellulose is partially modified. The above-mentioned ion-exchanged cellulose is also a kind of cellulose derivative. Examples of cellulose derivatives include cellulose acetate, carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC) and the like.

Cellulose fibers can be preferably used because they are excellent in texture and appearance when blended in a non-woven fabric. The cellulose fibers may be in the form of long fibers, short fibers, or may be processed into powder. Cellulose fibers having a fiber length of about 0.01 mm to 5 mm can be preferably used. For example, as powdered cellulose manufactured by Rettenmeier, there are products having 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-shaped cellulose fiber may be used as a pretreatment for the dye coating treatment after being cut into a size suitable for the subsequent mechanical treatment and then defibrated.

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

The quaternary ammonium salt is a salt of a quaternary ammonium cation and another anion. The quaternary ammonium cation is a positively charged polyatomic ion represented by the molecular formula NR4 + (in the formula, R is an alkyl group or an aryl group), and is always charged in the solution regardless of the pH of the solution. It is known as a material that is used. It is considered that this quaternary ammonium cation attaches 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 the embodiments of the present invention include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, benzyltrimethylammonium chloride, benzyltriethylammonium chloride, cetylpyridium chloride, Benzalkonium chloride, benzethonium chloride, dialkyldimethylammonium chloride, didecyldimethylammonium chloride, distearyldimethylammonium chloride and the like can be mentioned. Cetylpyridinium chloride, benzethonium chloride, or didecyldimethylammonium chloride can be preferably used. In particular, benzirconium chloride can be preferably used.

<Binder>
Binders are used to anchor the pH indicator to 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 and vinyl chloride resins. Examples thereof include synthetic resins such as vinyl chloride copolymer resin, polyvinyl butyral resin, polyvinyl acetate emulsion, acrylic acid ester copolymer emulsion, vinylidene chloride copolymer emulsion, epoxy resin emulsion, and synthetic rubber latex.

When a binder is used to fix the pH indicator to the carrier, first, the binder is dissolved in a solvent in addition to the pH indicator and the quaternary ammonium salt, and then the pH indicator mixed solution (hereinafter, also referred to as a dye solution) is used. To prepare. The dye solution is then coated on the carrier by methods such as spray coating or dropping. This allows the pH indicator and quaternary ammonium salt to be physically immobilized on 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 often 60 mPa · s or less, more preferably 30 mPa, in a solution prepared with ethanol / toluene (1/1) (w / w) of the binder so that the final concentration is 10% by mass. -It is desirable that it is s or less.

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

(Heat-fused resin)
In the embodiment of the present invention, the heat-sealing resin A is a binder resin that binds the constituent components. Further, the heat-sealing resin has an effect of imparting strength to the functional sheet, and the shape of the functional sheet is easily maintained by containing the heat-sealing resin.

The heat-sealing resin can bind functional substances to each other, functional substances to pH indicators, and pH indicators to each other. When other components are contained, the heat-sealing resin can bind functional substances to each other, functional substances to a pH indicator, or pH indicators to each other and other components. The heat-sealing 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 interfere with the contact and elution of the functional substance with water. It is compounded.

The heat-sealing resin may be in the form of fibers or in the form of particles. The heat-sealing resin is preferably fibrous from the viewpoint of higher strength. The heat-sealing resin may be in the form of a shortcut fiber, for example.

Examples of the heat-sealing resin include 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, and polybutylene succi. Nate and the like can be mentioned.

The heat-sealing resin may be a composite of two or more kinds of resins. For example, it has a core-sheath fiber composed of a core portion and a sheath portion, a side-by-side fiber in which one half and the other half in a cross section perpendicular to the longitudinal direction are made of different resins, and a core and shell made of different resins. Examples include core-shell particles. Above all, the core-sheath fiber is preferable when it is desired to exhibit the performance of the heat-sealing resin while improving the rigidity of the non-woven fabric.

Examples of the core-sheath fiber include a core portion made of polypropylene fiber (melting point 160 ° C.) and a core portion.
Examples thereof include PP / PE composite core-sheath fibers having a sheath portion made of polyethylene (melting point 130 ° C.) formed on the outer periphery of the core portion. As other core-sheath fibers, 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 thereof include low melting point polyamide composite core sheath fiber, polylactic acid / low melting point polylactic acid composite core sheath fiber, polylactic acid / polybutylene succinate composite core sheath fiber and the like. Among the core-sheath fibers, composite core-sheath fibers having a sheath portion made of polyethylene, such as PP / PE composite core-sheath fiber, PET / PE composite core-sheath fiber, and PE / PE composite core-sheath fiber, are preferable.

The heat-sealing resin includes (1) PET heat-sealing fiber, (2) composite core-sheath fiber having a sheath portion made of PET, (3) polyethylene heat-sealing fiber, and (4) polyethylene. At least one selected from the group consisting of composite core-sheath fibers having a sheath portion, (5) EVA heat-sealing fibers, and (6) composite core-sheath fibers having a sheath portion made of EVA is preferable, and polyethylene heat is preferable. More preferably, at least one selected from the group consisting of cohesive fibers and core-sheath fibers having a sheath portion made of polyethylene.

Two or more types of heat-sealing resins may be used in combination. That is, the heat-sealing resins A and B may be the same heat-sealing resin or different heat-sealing resins. As the heat-sealing resin A and the heat-sealing resin B, one type of heat-sealing resin may be used, or a plurality of types of heat-sealing resins may be used in combination. When the functional sheet contains another layer 300 described later, and the other layer 300 contains a heat-sealing resin, the heat-sealing resin contained in the other layer 300 is heat-sealed. It may be the same as or different from the sex 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, and 120, the functional sheet of the present invention can include another layer 300 for the purpose of imparting functionality such as surface modification and imparting strength (rigidity). ..

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

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

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

(Effect promoter)
The functional sheet of the present invention may contain one or more effect promoters depending on the intended use.

Examples of effect promoters include: oil-based bases, moisturizers, feel improvers, surfactants, polymers, thickening / gelling agents, solvents, propellants, antioxidants, reducing agents, oxidizing agents, preservatives. , 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 Accelerators, stimulants, hormones, anti-wrinkles, anti-aging agents, tightening agents, cold sensants, warming agents, wound healing promoters, stimulants, painkillers, cell activators, plant / animal / microbial extracts , Antipruritic, keratin exfoliating / dissolving agent, antibacterial agent, refreshing agent, astringent, enzyme, nucleic acid, fragrance, pigment, colorant, dye, pigment, metal-containing compound, unsaturated monomer, polyhydric alcohol, high Molecular additives, anti-inflammatory analgesics, antifungal agents, antihistamines, hypnotic sedatives, tranquilizers, antihypertensive agents, antihypertensive diuretics, antibiotics, anesthetics, antibacterial agents, antiepileptic agents, coronary vasodilators, crude drugs , Auxiliary agents, wetting agents, thickeners, tackifiers, antipruritic agents, keratin softening release agents, oily raw materials, UV blocking agents, preservatives and bactericides, antioxidants, liquid matrices, fat-soluble substances, high molecular weight carboxylic acids Examples include salts, additives, metal shavings, water-absorbent materials and the like.

The effect accelerator can be blended in the functional substance-containing layers 100, 110, and 120. When the functional sheet has a multi-layer structure including a functional substance-containing layer and another layer, it can be blended in any one or a plurality of layers.

(Heat seal processing)
The heat seal 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 composed of only a pH indicator and a functional substance is used as an intermediate layer, and other layers 300 containing a heat-sealing resin are arranged on both sides thereof. By heat-sealing the four sides, a functional sheet having a multi-layer structure can be formed. At least one of the other layers 300 arranged on both sides of the functional substance-containing layer has a configuration through which the color change of the functional substance-containing layer can be visually recognized by the user. For example, the other layer 300 may be transparent or translucent, and may have a mesh structure having a mesh size so that the constituent material of the functional substance-containing layer does not leak to the outside. ..

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

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

(Embossing)
Embossing is a process in which heat is applied by pressing strongly with a stamp carved with an uneven pattern. This method can also be used for interlayer adhesion of a multilayer structure. In addition, this method can also be used to apply surface treatment such as unevenness to a functional sheet having a single-layer or multi-layer structure.

(Content ratio of ingredients)
The amount of the functional substance compounded in the functional sheet also depends on the application 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 exhibiting 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. Further, from the viewpoint of exhibiting the deodorizing property of the metal (water) oxide, the amount of powder in the total amount of the sheet is preferably 1% by mass or more, and 3% by mass, although it depends on the type of gas to be deodorized. The above is more preferable, 5% by mass or more is further preferable, 8% by mass or more is even more preferable, and 10% by mass or more is particularly preferable. Further, from the viewpoint of preventing the 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, preferably 50% by mass. % Or less, more preferably 40% by mass or less.

(Basis weight)
The basis weight of the functional sheet can be appropriately set according to the application. For example, it is preferably 10~4000g / m ^2, more preferably 30~3000g / m ^2, more preferably 50 to 300 g / m ^2. If the basis weight is too small, it may be difficult to produce a uniform sheet (nonwoven fabric), and if the basis weight is too large, handling during use may be poor.

(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 the dye solution (pH indicator mixed solution) to the carrier, which is applicable to the embodiment of the present invention, will be described.

The methods for applying a dye (pH indicator) to a functional sheet can be broadly divided into the following methods.

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

Further, there is a method of preparing a sheet (nonwoven fabric) and then applying the dye solution to the surface of the sheet (nonwoven fabric). For example, there is a method of coating the surface of a sheet by spraying a dye solution at the time of forming a non-woven fabric sheet. Further, the dye solution may be applied to the carrier (sheet component) by impregnation, not limited to the coating.

<Solvent>
Examples of solvents applicable to prepare 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 binder, etc.) that should be a constituent material of the dye solution, and after coating the dye solution on the carrier, A solvent that can be removed by a method such as vacuum drying is preferable. Alcohols are particularly good, and isopropyl alcohol is even better.

(Mixing amount)
The amount of the dye (pH indicator) to be blended varies depending on the dye used, but the amount in which a clear color change is observed at the time of use is preferable. For example, the blending amount of thymolphthalein is preferably 0.01 to 0.5% (w / w), more preferably 0.02 to 0.1% (w / w) with respect to the weight of the carrier. The carrier referred to here refers to a component (fiber, powder, etc.) of the functional substance-containing layer in which the pH indicator is blended in the functional sheet.

The blending amount of the binder is preferably 3% (w / w) or less, more preferably 2% (w / w) or less, based on the weight of the carrier. If it is blended in an amount of more than 3%, the water repellency of the carrier carrying the dye becomes high, the solution becomes difficult to permeate, and the color development property tends to deteriorate.

The blending amount of the 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 available for sale from manufacturers in the form of aqueous solutions such as 10% aqueous solution and 50% aqueous solution, but the above value is the amount of solid content as benzalkonium chloride. ..

The above-mentioned compounding amount can be optimized according to the compounding amount of each drug. For example, when the binder is blended in an amount of 2% (w / w) based on the weight of the carrier, the blending amount of benzalkonium chloride is 0.1 to 0.5% (w / w) based on the weight of the carrier. ). When no binder is added, the amount of benzalkonium chloride compounded is preferably 0.3 to 2% (w / w) with respect to the weight of the carrier.

That is, a configuration without a binder is also included in the embodiment of the present invention, but by adding a binder, it is possible to reinforce the adhesion of the pH indicator to the carrier, and benzalkonium chloride. The blending amount 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 blended is small, the viscosity of the dye solution becomes high, and uniform mixing with the carrier becomes difficult. On the other hand, if the amount of the solvent is too large, the treatment time in the drying step after mixing the dye solution and the carrier becomes long, which causes an increase in the treatment time and an increase in cost.

(Amount of carrier compounded)
The carrier on which the pH indicator I is immobilized can be blended in the functional substance-containing layers 100, 110, and 120 at an arbitrary ratio. From the viewpoint of 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.

(Manufacturing method of functional sheet)
For example, in a web forming apparatus that employs the airlaid method, a functional substance-containing layer containing a pH indicator and a functional substance is prepared, and when another layer is contained, another layer is added to the functional substance-containing layer. A manufacturing method in which they are laminated separately can be used. As such a method, there is a method in which a heat-sealing resin B such as polyethylene (PE) is arranged on the surface of the functional substance-containing layer, and the heat-sealing resin B is melted by heat and bonded. .. Alternatively, when a functional substance-containing layer (for example, a functional substance-containing layer 120 containing a heat-sealing resin A) is produced by a web forming apparatus adopting an air-laid method, the web becomes the functional substance-containing layer 120. By using the other layer 300 of the present invention for the carrier sheet for transporting the layer, a laminate 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 is formed. A functional sheet having a configuration may be obtained. Further, each layer of the separately prepared functional sheet may be joined by embossing or heat sealing. Further, there is also a method in which an adhesive layer (adhesive layer) is provided on at least one of the joint surfaces of each layer of the functional sheet with a hot melt adhesive such as a thermoplastic resin, and the layers are joined by hot melt processing. In order to prevent the functional substances from coming into contact with water and dissolving during production, in the present invention, these layers are laminated by a dry method (non-aqueous method).

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[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 total amount was increased to 500 g with isopropanol on a mass / mass basis. A mixed solution was prepared by mixing until polyvinyl butyral was completely dissolved, and this was used as a dye solution C1.

<Coating the dye solution on the carrier>
The dye solution C1 was added while stirring the powdered cellulose fibers (fiber length 0.2 mm) with a mixer, and the mixture was stirred until the fibers and the dye solution were uniformly mixed. Then, it was dried in a dryer under the condition of 105 ° C. for 2 hours to remove the solvent, and a powdery dye-coated cellulose fiber (fiber length 0.2 mm) was obtained.

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

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

Next, the defibration shortcut fiber of PE fiber, the defibration shortcut fiber of PET fiber, and the particle mixture of PE powder / calcium oxide / dye-coated cellulose fiber were mixed at a ratio (mass ratio) of 40/40/20. Uniformly mixed by air flow to obtain a web feedstock containing PE / PET / dye-coated cellulose fibers / calcium oxide.

A one-layer non-woven fabric sheet was formed from the web raw material using a web forming apparatus.

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

The color of the sheet before soaking with water was white. The part containing water quickly turned 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 the mixture was prepared with isopropanol so as to be 500 g on a mass / mass basis. Dye solution C2 was prepared by mixing until polyvinyl butyral was completely dissolved.

Other than that, <coating of the dye solution on the carrier> and <sheeting> were performed in the same manner as in Example 1 to form a one-layer non-woven fabric sheet.

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

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

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

<Sheet>
Fibers obtained by defibrating flap pulp and defibrated shortcut fibers obtained by defibrating short-cut polyethylene (PE) heat-sealing fibers and short-cut polyethylene terephthalate (PET) fibers, respectively.

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

Next, the defibrated fiber of fluff pulp, the defibrated shortcut fiber of PE fiber, the defibrated shortcut fiber of PET fiber, and the particle mixture of PE powder and calcium oxide were added to 70/15/15/5. Uniformly mixed by air flow in proportion (mass ratio) to obtain a web feedstock containing fluff pulp / PE / PET / calcium oxide.

A one-layer non-woven fabric sheet was formed from the web raw material using a web forming apparatus.

<Coating the dye solution on the carrier>
The dye solution was sprayed uniformly onto the formed sheet to allow the dye to adhere. As the dye solution to be sprayed, 50 g was used with respect to 100 g of the non-woven fabric sheet. The non-woven fabric after spraying was dried in a dryer under the condition of 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 the color development and pH were confirmed when 5 times the weight of the sheet was impregnated with water.

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

(Confirmation of 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 the dye, which is a color-developing component of the sheet, elutes out of the sheet and moves to the 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 firmly the dye is fixed to the sheet, which is preferable. It is more preferable that the color transfer cannot be confirmed.

No color transfer could 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 the volume was adjusted to 500 g with isopropanol on a mass / mass basis. Dye solution R1 was prepared by mixing until polyvinyl butyral was completely dissolved.

<Coating of the dye solution on the carrier> and <Sheet formation> were carried out in the same manner as in Example 1 to form a one-layer non-woven fabric sheet.

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

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

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

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

[Comparative Example 2]
<Preparation of dye solution>
50 g of a 2% timolephthaline solution, 10 g of a 50% aqueous solution of benzalkonium chloride, and 40 g of polyvinylpyrrolidone, a water-soluble polymer compound, were dissolved in isopropanol, and the mixture was prepared with isopropanol so as to be 500 g on a mass / mass basis. Dye solution R2 was prepared by mixing until polyvinylpyrrolidone was completely dissolved.

<Coating of the dye solution on the carrier> and <Sheet formation> were carried out in the same manner as in Example 1 to form a one-layer non-woven fabric sheet.

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

The color of the sheet before soaking with water was white. The water-containing part quickly turned blue. The pH of the water contained in the sheet at this time was 12.0.

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

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

As described above, in Examples 1 to 3 containing the pH indicator, the functional substance (calcium oxide), and the quaternary ammonium salt, the alkaline pH is exhibited by adding water, and the pH is clear. Color change (color development) was observed. In addition, no color transfer was observed after color development in the case where the binder was not blended as in Example 3.

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

As described above, according to the embodiment of the present invention, the functional substance contained in the functional sheet exerts its function by the reaction mediated by the applied water, and at that time, the hydrogen ion concentration in the water changes. Occurs. The pH indicator contained in the functional sheet changes color (color development) or discolors 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 performing its function. Therefore, the user can use the functional sheet while the functional sheet is performing its function.

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

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

1 Web forming apparatus 30 Web raw material supply means 41 First carrier sheet 51 Second carrier sheet A Heat-sealing resin B Heat-sealing resin D Functional substance F Fiber I pH indicator W Airlaid web 100 Contains functional substance Layer 110 Functional substance-containing layer containing fibers 120 Functional substance-containing layer containing heat-sealing resin A 200 Layer containing heat-sealing resin B 300 Other layers 500 Adhesive layer

Claims (13)

A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is a metal oxide. A functional sheet featuring. A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is cyclodextrin. A featured functional sheet. A layer containing a pH indicator, a functional substance, and a carrier is provided, the pH indicator is fixed to the carrier by a quaternary ammonium salt, and the functional substance is a carbon dioxide gas generating agent. A functional sheet that features that. The invention according to any one of claims 1 to 3 , further comprising a binder, wherein the pH indicator is immobilized on the carrier by the quaternary ammonium salt and the binder. Functional sheet. The functional sheet according to claim 4, wherein the binder is a water-insoluble polymer compound. The layer comprises fibers, a space formed by said fibers, said said carrier pH indicator is fixed, characterized in that said functional material, is held, claims 1-5 The functional sheet according to any one of the above. The layer comprises a heat-sealing resin, and a part of the carrier on which the pH indicator is fixed is fixed in a state of being coated with the heat-sealing resin. The functional sheet according to any one of 1 to 6. The adjacent layer adjacent to the layer contains a heat-sealing resin, and a part of the carrier on which the pH indicator present in the layer is fixed is fixed in a state of being coated with the heat-sealing resin. The functional sheet according to any one of claims 1 to 7 , wherein the functional sheet is characterized by the above. The quaternary ammonium salt is at least one selected from the group consisting of benzylzyl chloride, cetylpyridinium chloride, benzethonium chloride, and didecyldimethylammonium salt, according to claims 1 to 8 . The functional sheet described in any one item. The functional sheet according to any one of claims 1 to 9 , wherein the carrier for fixing the pH indicator is cellulose and / or a cellulose derivative. The method for manufacturing a functional sheet according to any one of claims 1 to 10.
A step of dissolving the pH indicator and the quaternary ammonium salt in a non-aqueous organic solvent, and
A step of applying the solution obtained by the above step to the carrier, and a step of applying the solution to the carrier.
A method for manufacturing a functional sheet, which comprises. The step of forming the carrier into a sheet is further included.
The manufacturing method according to claim 11 , wherein the imparting step is performed before the sheet-forming step. The step of forming the carrier into a sheet is further included.
The manufacturing method according to claim 11 , wherein the imparting step is performed after the sheet-forming step.

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