Fabric manufacturing method and fabric

Abstract

This invention provides a simple method for manufacturing fabrics in which the pattern changes in response to lactic acid. [Solution] The fabric manufacturing method includes an exposure step of exposing the fabric to monomer A having a boronic acid group and monomer B having a cationic group; a polymerization step of polymerizing monomer A and monomer B and coating the fabric with the polymer product; a coloring step of coloring at least a portion of the polymer-coated area with an anionic dye; and a reaction step of exposing at least a portion of the polymer-coated area to reactive oxygen species.

Description

TECHNICAL FIELD

[0001] The present invention relates to a fabric manufacturing method and a fabric. BACKGROUND ART

[0002] The lactic acid concentration in body fluid serves as an indicator of physical fatigue level and exercise intensity. For this reason, a method of managing training by measuring the lactic acid concentration in body fluid of athletes is widely used. Currently used lactic acid measurement methods involve invasive blood collection, which imposes a heavy burden on subjects and measurement operators and cannot perform continuous measurement. If the lactic acid concentration in sweat can be easily measured non-invasively, it would be useful for health promotion or effective training.

[0003] To reduce the burden on subjects and measurement operators and enable continuous measurement, techniques for estimating blood lactic acid concentration from lactic acid concentration in sweat have been studied. Patent Document 1 discloses a biological information measuring device including a component concentration detection unit provided with a stimulus-responsive gel for calculating the concentration of lactic acid contained in sweat. The stimulus-responsive gel contains polymer chains having boronic acid groups. The bonding between boronic acid groups and lactic acid brings the polymer chains into a dissociated state, so the volume of the stimulus-responsive gel expands. The amount of lactic acid in sweat can be measured by measuring the conductivity of the stimulus-responsive gel that changes as the volume expands.

[0004] Non-patent document 1 discloses a fabric in which polymers are retained by a polymerization reaction in both a lactic acid-responsive portion coated with a monomer solution containing monomers having boronic acid groups and monomers having cationic groups, and a lactic acid-non-responsive portion coated with a monomer solution containing monomers without boronic acid groups and monomers having cationic groups. When an anionic dye is retained on the cationic groups of the lactic acid-responsive portion and the lactic acid-non-responsive portion, when exposed to lactic acid, the anionic dye is removed and decolorized in the lactic acid-responsive portion, while the anionic dye is maintained in the lactic acid-non-responsive portion and hardly discolors. By combining the lactic acid-responsive portion and the lactic acid-non-responsive portion, the pattern changes depending on the lactic acid concentration in the sweat, making it possible to measure the lactic acid concentration in the sweat of a wearer of clothing made from this fabric. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2017-198577 [Non-patent literature]

[0006] [Non-Patent Document 1] Yasumasa Kanekiyo and Risa Sato, Proceedings of the 2023 Annual Meeting of the Textile Institute of Japan, 2Pa17, "Preparation and Characterization of Fabrics with Pattern Changes in Response to Lactic Acid," The Textile Institute of Japan, published June 7, 2023. [Overview of the initiative] [Problems that the invention aims to solve]

[0007] The bio-information measuring device disclosed in Patent Document 1 above may interfere with the wearer's athletic performance, placing an unnecessary burden on them. In the fabric disclosed in Non-Patent Document 1 above, two types of monomer solutions are used to arrange the lactic acid-responsive and non-responsive parts according to the pattern. Therefore, it is necessary to perform a polymerization reaction in the non-responsive parts, mask them, and then perform another polymerization reaction in the lactic acid-responsive parts. As a result, the fabric is complicated and time-consuming to manufacture, and it is not easy to align the two types of patterns, often resulting in pattern misalignment.

[0008] This invention has been made in view of the above circumstances, and aims to provide a method for easily producing a fabric whose pattern changes in response to lactic acid, and a fabric whose pattern changes in response to lactic acid. [Means for solving the problem]

[0009] A fabric manufacturing method according to the first aspect of the present invention is: An exposure step in which the fabric is exposed to a first monomer having a boronic acid group and a second monomer having a cationic group, A polymerization step of polymerizing the first monomer and the second monomer and coating the fabric with the polymer product, A coloring step of coloring at least a portion of the region coated with the polymer with an anionic dye, A reaction step of exposing at least a portion of the region coated with the polymer to reactive oxygen species, Includes.

[0010] In the reaction step, a portion of the colored region colored with the anionic dye is exposed to the reactive oxygen species. It would be acceptable to do so.

[0011] In the reaction step, a portion of the colored region is masked as a response region, and the unmasked portion of the colored region, which is the non-response region, is exposed to the reactive oxygen species. It would be acceptable to do so.

[0012] In the reaction step, a portion of the polymer-coated region different from the colored region colored with the anionic dye is exposed to the active oxygen species, this may be the case.

[0013] In the reaction step, a portion different from the colored region is defined as an adsorption region, a portion other than the adsorption region is masked, and the adsorption region, which is the unmasked portion, is exposed to the active oxygen species, this may be the case.

[0014] The molar ratio of the first monomer to the second monomer is from 1.0 to 15.0, this may be the case.

[0015] The active oxygen species is hydrogen peroxide, this may be the case.

[0016] The fabric according to the second aspect of the present invention includes: a responsive region comprising an anionic dye held by the cationic groups in at least a part of a region coated with a polymer that is a polymerization product obtained by polymerizing a first monomer having a boronic acid group and a second monomer having a cationic group; a non-responsive region comprising the anionic dye held by the cationic groups in at least a part of the polymer-coated region, wherein the boronic acid groups have reacted with active oxygen species; .

[0017] The fabric according to the third aspect of the present invention includes: a responsive region comprising an anionic dye held by the cationic groups in at least a part of a region coated with a polymer that is a polymerization product obtained by polymerizing a first monomer having a boronic acid group and a second monomer having a cationic group; an adsorption region which is arranged at a position not overlapping with the responsive region in the polymer-coated region and in which the boronic acid groups have reacted with active oxygen species; comprising.

Effects of the Invention

[0018] According to the present invention, a fabric whose pattern changes in response to lactic acid can be easily produced. Further, according to the present invention, a fabric whose pattern changes in response to lactic acid is provided.

Brief Description of Drawings

[0019] [Figure 1] It is a diagram showing a fabric according to an embodiment of the present invention. [Figure 2] It is a diagram showing the pattern change of the fabric shown in FIG. 1. [Figure 3] It is a diagram showing a fabric according to another embodiment of the present invention. [Figure 4] It is a diagram showing the pattern change of the fabric shown in FIG. 3. [Figure 5] It is a diagram showing the appearance of a fabric sample in Test Example 1. [Figure 6] It is a diagram showing a schematic view of a stencil according to Example 2. [Figure 7] It is a diagram showing the appearance of a fabric sample in Test Example 2. [Figure 8] It is a diagram showing the appearance of a fabric sample in Example 3.

Mode for Carrying Out the Invention

[0020] Embodiments according to the present invention will be described with reference to the drawings. Note that the present invention is not limited by the following embodiments and the drawings. In the following embodiments, expressions such as "have", "include" or "contain" also encompass the meaning of "consist of" or "be composed of".

[0021] (Embodiment 1) The fabric 10 according to this embodiment will be described with reference to Figure 1. The fabric 10 is not particularly limited as long as it has the property of absorbing not only liquid sweat but also gaseous sweat, and specifically includes fabrics such as cotton, linen, lyocell, rayon, cupro, silk, and wool. The fabric 10 may also include fabrics made of synthetic fibers such as polyester and nylon, and preferably synthetic fibers with enhanced hygroscopicity or water absorption may be used. The fabric 10 is also called a cloth, and includes woven fabrics and cloths. The fabric 10 may also include fabrics made of the above-mentioned multiple types of materials.

[0022] The white fabric 10 comprises a response region 1 and a non-response region 2. The response region 1 has an anionic dye held by the cationic group in at least a portion of the region covered with a polymer, which is a polymerization product obtained by polymerizing a monomer having a boronic acid group (hereinafter also referred to as monomer A) and a monomer having a cationic group (hereinafter also referred to as monomer B). In the fabric 10, the circular region shown in Figure 1 is the region covered with the polymer. Here, it is assumed that the entire region covered with the polymer has an anionic dye. The response region 1 in the fabric 10 is the portion within the circular region shown by the solid line, excluding the X-shaped region shown by the dashed line.

[0023] Monomer A, which has a boronic acid group (-B(OH)2), generates a negative charge when the boronic acid group binds to a lactate ion. Monomer A is not particularly limited as long as it has a boronic acid group. Examples of monomer A include 3-acrylamide phenylboronic acid, vinyl phenylboronic acid, and acryloyloxyphenylboronic acid. Preferably, monomer A is 3-acrylamide phenylboronic acid.

[0024] Monomer B has a positive charge and serves as the adsorption site for the anionic dye. Monomer B is not particularly limited as long as it has a cationic group. Cationic groups include cationic groups and groups that become cationic when ionized. Examples of cationic groups include primary amino groups, secondary amino groups, tertiary amino groups, imino groups, sulfonium groups, oxonium groups, phosphonium groups, as well as diallyldimethylammonium base, (3-methacrylamidopropyl)trimethylammonium base, and quaternary ammonium bases such as [2-(methacryloyloxy)ethyl]trimethylammonium chloride. Examples of monomer B include (3-acrylamidopropyl)trimethylammonium chloride, trimethyl-(methacrylamido)-ammonium chloride, trimethyl-(3-acrylamido-3-dimethylpropyl)-ammonium chloride, and 3-methacrylamidopropyltrimethylammonium chloride. Preferably, monomer B is (3-acrylamidopropyl)trimethylammonium chloride.

[0025] Monomer A and monomer B can be polymerized by known methods. Preferably, a polymerization initiator that generates radicals and serves as the starting point for the polymerization reaction, and a crosslinking agent that crosslinks the polymer to form a three-dimensional network structure are used for the polymerization reaction. The polymerization initiator is not particularly limited as long as it can produce a polymer. Examples of polymerization initiators include inorganic peroxides, organic initiators, redox agents, etc. Preferably, the polymerization initiator is a radical polymerization initiator such as an organic oxide or an azo compound. Specifically, examples of polymerization initiators include benzoyl peroxide, 2,2'-azobis(isobutylamidine)dihydrochloride (AIBA), 4,4'-azobis-4-cyanovaleric acid, azobisisobutyronitonyl (AIBN), and 2,2'-azobis(2-methylpropionamidine)dihydrochloride (AAPH). Preferably, the polymerization initiator generates radicals by irradiation with ultraviolet (UV) light such as AAPH.

[0026] The crosslinking agent is not particularly limited, and known crosslinking agents can be used. For example, examples of crosslinking agents include N,N'-methylenebisacrylamide (Bis), ethylene glycol dimethacrylate (EGDMA), divinylbenzene (DVB), tetraallyloxyethane (TAO), and pentaerythritol triacrylate (PETA). Bis is preferred as the crosslinking agent.

[0027] Anionic dyes have a negative charge and are not particularly limited as long as they are held by a cationic group. Examples of anionic dyes include tripotassium indigotrisulfonate, acid red 18, brilliant blue FCF, and sunset yellow FCF.

[0028] Non-responsive region 2 is a region in which an anionic dye is held by a cationic group in at least a portion of the region coated with the polymer, and in which the boronic acid group has reacted with a reactive oxygen species. As shown in Figure 1, non-responsive region 2 in fabric 10 is an X-shaped region indicated by a dashed line within a circular region.

[0029] The reactive oxygen species are not particularly limited as long as they are substances that selectively react with boronic acid groups to undergo oxidative deboration. Examples of reactive oxygen species include hydrogen peroxide, singlet oxygen, superoxide, and hydroxyl radicals. Preferably, the reactive oxygen species is hydrogen peroxide. For example, the non-responsive region 2 can be provided by exposing a portion of a region coated with a polymer and having an anionic dye held by a cationic group to the reactive oxygen species.

[0030] In response region 1, lactic acid and the boronic acid group bond and acquire a negative charge, causing the anionic dye to detach from the cationic group, and the negative charge generated by the bonding of lactic acid and the boronic acid group then bonds with the cationic group. On the other hand, in non-response region 2, the boronic acid group has already reacted with reactive oxygen species, so the boronic acid group has become a hydroxyl group (-OH) due to oxidative deboration and does not react with lactic acid, thus suppressing the detachment of the anionic dye held by the cationic group. For this reason, in the presence of lactic acid, response region 1 is decolorized, while color remains in non-response region 2.

[0031] As shown in Figure 2, the region containing the anionic dye is the circular region shown in Figure 1; therefore, only this circular region is visible on the fabric 10 before contact with lactic acid. When the fabric 10 comes into contact with lactic acid, decolorization of response region 1 progresses in a concentration-dependent and time-dependent manner, while non-response region 2 is hardly decolorized and retains its color. As a result, after exposure to lactic acid, response region 1 disappears or becomes indistinct, and only non-response region 2 is clearly visible on the fabric 10.

[0032] With fabric 10, by appropriately designing the shapes of the response region 1 and the non-response region 2, any pattern can be displayed in response to lactic acid. By making clothing such as sportswear from fabric 10, lactic acid in sweat can be detected without burdening the wearer.

[0033] The degree to which anionic dyes are detached from cationic groups in response region 1 depends on the concentration of lactic acid. Therefore, by conducting tests using samples containing different concentrations of lactic acid, for example, the difference in brightness or color between response region 1 and non-response region 2 can be quantified, and the correlation (calibration curve) between the difference in brightness or color and the lactic acid concentration can be obtained to estimate the lactic acid concentration in sweat.

[0034] (Embodiment 2) Referring to Figure 3, the differences between the fabric 20 according to this embodiment and the fabric 10 according to Embodiment 1 will be mainly explained. Unless otherwise specified, the fabric 20 can be referred to in Embodiment 1.

[0035] The fabric 20 is a region entirely covered with the polymer described above. The fabric 20 comprises a response region 1 and an adsorption region 3. The response region 1 is the same as the response region 1 in the fabric 10 according to Embodiment 1, except that it is a circular region shown by a solid line in Figure 3. As shown in Figure 3, the adsorption region 3 is located in a position that does not overlap with the response region 1 in the region covered with the polymer. The adsorption region 3 is a region where boronic acid groups have reacted with reactive oxygen species. Unlike the non-response region 2, the adsorption region 3 does not have anionic dyes held by cationic groups. Since the region having anionic dyes is the circular region shown in Figure 3, only this circular region is visible on the fabric 20 before contact with lactic acid.

[0036] Adsorption region 3 is a region where the boronic acid group has already reacted with reactive oxygen species; therefore, the boronic acid group has been converted to a hydroxyl group by oxidative deboration, and the cationic group is positively charged. In the presence of lactic acid, the anionic dye that has been detached from the cationic group in response region 1 binds to the cationic group. As a result, in the presence of lactic acid, decolorization occurs in response region 1, and adsorption region 3 becomes colored.

[0037] As shown in Figure 4, when the fabric 20 comes into contact with lactic acid, decolorization of response region 1 progresses, and adsorption region 3 becomes colored. As a result, after exposure to lactic acid, response region 1 disappears or becomes indistinct, and only adsorption region 3 remains clearly visible on the fabric 20.

[0038] According to fabric 20, by appropriately designing the shapes of response region 1 and adsorption region 3, any pattern can be displayed in response to lactic acid. Since the anionic dye present in response region 1 is used to color adsorption region 3, the consumption of anionic dye can be reduced.

[0039] Although the fabric 20 is provided with a response region 1 and an adsorption region 3, it may also be provided with a non-response region 2 in addition to the response region 1 and the adsorption region 3. By providing the fabric 20 with a response region 1, a non-response region 2, and an adsorption region 3, a variety of patterns that appear in response to lactic acid can be ensured.

[0040] (Embodiment 3) Next, a method for manufacturing fabric according to this embodiment will be described. Unless otherwise specified, the method for manufacturing fabric can be described by referring to Embodiment 1 and Embodiment 2 described above.

[0041] The fabric manufacturing method according to this embodiment includes an exposure step, a polymerization step, a coloring step, and a reaction step. In the exposure step, the fabric is exposed to monomers A and B. The manner of exposure is arbitrary as long as monomers A and B come into contact with the fabric. For example, it is preferable to use a monomer solution containing monomers A and B in the exposure step. For example, when the entire fabric is to be coated with polymer using the monomer solution, the monomer solution may be impregnated into the fabric in the exposure step. Also, when a part of the fabric is to be coated with polymer using the monomer solution, the monomer solution may be dropped onto that area. The amount of monomer solution dropped can be appropriately adjusted according to the type, thickness, size, etc. of the fabric 10, but for example, 0.01 to 1 μL / mm 2 , 0.05~0.5 μL / mm 2 Or 0.1~0.2 μL / mm 2 That is the case.

[0042] The concentrations of monomer A and monomer B in the monomer solution are adjusted as appropriate depending on the type of fabric, etc. For example, the concentration of monomer A in the monomer solution is 400-1500 mM, 500-1200 mM, 600-1000 mM, or 700-900 mM. For example, the concentration of monomer B in the monomer solution is 50-400 mM, 80-350 mM, 100-200 mM, or 150-250 mM.

[0043] When a monomer solution is used, the monomer solution may further contain a polymerization initiator and a crosslinking agent. The concentration of the crosslinking agent in the monomer solution is, for example, 100-800 mM, 200-600 mM, 300-500 mM, or 350-450 mM. The concentration of the polymerization initiator in the monomer solution is, for example, 50-200 mM, 60-150 mM, 70-120 mM, or 80-110 mM. The solvent of the monomer solution is not particularly limited as long as the solute is soluble, but for example, a mixed solvent of methanol and water.

[0044] Preferably, the molar ratio of monomer A to monomer B is 1.0-15.0, 1.0-10.0, 2.0-5.0, 3.5-4.5, 3.8-4.2, or 3.9-4.1. Preferably, the molar ratio of monomer A to monomer B is 4.

[0045] In the polymerization step, monomer A and monomer B are polymerized, and the fabric is coated with the polymer product. The polymerization initiator and crosslinking agent described above are used for the polymerization reaction. For example, the polymerization reaction can be started by irradiating with ultraviolet (UV) light, depending on the polymerization initiator.

[0046] In the coloring step, at least a portion of the polymer-coated area is colored with an anionic dye. The coloring can be carried out in any manner as long as the fabric comes into contact with the anionic dye. For example, a solution containing the anionic dye may be sprayed or dropped onto the fabric, or the fabric may be impregnated with a solution containing the anionic dye. The concentration of the solution containing the anionic dye is not particularly limited, but for example, it may be 0.1 to 50 mM, 0.5 to 30 mM, or 0.8 to 20 mM.

[0047] In the exposure and coloring steps, masking materials with pores of any shape are useful, taking the design into consideration. For example, by covering the fabric with masking material and spraying the masking material with a monomer solution or a solution containing anionic dye, the desired shape of the area can be treated. In the polymerization step, masking materials with light-transmitting portions (transparent portions) of any shape are useful, taking the design into consideration. In the polymerization step, the fabric may be covered with the masking material, and UV light may be irradiated from above the masking material to polymerize monomer A and monomer B.

[0048] In the reaction step, at least a portion of the polymer-coated area is exposed to reactive oxygen species. In the reaction step, a portion of the colored area colored with an anionic dye, such as non-responsive area 2 in the fabric 10, may be exposed to reactive oxygen species. More specifically, in the reaction step, a portion of the colored area may be masked as a responsive area, and the non-responsive area, which is the unmasked portion of the colored area, may be exposed to reactive oxygen species. The exposure of the fabric to reactive oxygen species is not limited in any particular manner as long as the fabric comes into contact with the reactive oxygen species; for example, a solution containing reactive oxygen species may be sprayed, applied, or dropped onto the fabric. The concentration of the solution containing reactive oxygen species is not particularly limited, but for example, it is 200-1000 mM, 300-600 mM, or 400-500 mM. Note that masking means covering a portion of the surface of the fabric 10.

[0049] In the reaction step, a portion of the polymer-coated region that is different from the colored region colored with an anionic dye, such as the adsorption region 3 in the fabric 20, may be exposed to reactive oxygen species. More specifically, in the reaction step, a portion different from the colored region may be treated as the adsorption region, the portion other than the adsorption region may be masked, and the unmasked portion, the adsorption region, may be exposed to reactive oxygen species.

[0050] According to the fabric manufacturing method of this embodiment, any pattern can be designed in a single polymerization reaction without requiring multiple polymerization reactions. Therefore, fabrics whose patterns change in response to lactic acid can be easily manufactured.

[0051] In addition, during the reaction step, a portion of the colored region colored with the anionic dye and a portion of the polymer-coated region that is different from the colored region colored with the anionic dye may be exposed to reactive oxygen species simultaneously or independently.

[0052] Furthermore, the fabric manufacturing method may include a washing step for washing the fabric between the polymerization step and the coloring step, between the coloring step and the reaction step, and after the reaction step. In the washing step, the fabric may be immersed in water and agitated, or the fabric may be exposed to running water. Furthermore, the fabric manufacturing method may include a drying step for drying the fabric between the coloring step and the reaction step, after the washing step, and after the reaction step.

[0053] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples. [Examples]

[0054] (Example 1) Commercially available cotton cloth was cut into 30mm squares, washed with water and acetone, and then dried with a hairdryer. 100 μL of monomer solution was dropped onto the cotton cloth, which was fixed to an acrylic plate with masking material attached to the back. An OHP sheet printed black, excluding a circular light-transmitting area, was used as the masking material.

[0055] The monomer solution is composed of 800 mM 3-acrylamidophenylboronic acid as monomer A having a boronic acid group, 200 mM (3-acrylamidopropyl)trimethylammonium chloride as monomer B having a cationic group, 400 mM Bis as a crosslinking agent, and 90 mM AAPH as a polymerization initiator. The solvent for the monomer solution is methanol and water (volume ratio 3:2).

[0056] [ka]

[0057] The cotton cloth was irradiated with UV light (365 nm) from the masking material side for 3 hours. The cotton cloth was then placed in a screw-top tube filled with water and stirred for 1 hour. After that, the cotton cloth was immersed in an aqueous solution containing 1 mM Acid Red 18 as a dye and stirred for 1 hour, followed by stirring in water for 1 hour, after which it was removed and air-dried. A stencil with X-shaped holes was placed on the cotton cloth, and an aqueous solution containing 450 mM hydrogen peroxide was sprayed on it, after which the cotton cloth was air-dried. The stencil was made by cutting an OHP sheet with holes of the predetermined shape using a cutting machine.

[0058] (Test Example 1) Sodium lactate was neutralized with 0.01 equivalents of hydrochloric acid, sodium chloride was added, and then the solution was appropriately diluted with distilled water to prepare aqueous solutions (artificial sweat solution) with lactate concentrations of 0 mM, 10 mM, 30 mM, or 100 mM and a sodium chloride concentration of 50 mM. The prepared fabric samples were immersed in the artificial sweat solution and stirred in a 25°C incubator for a predetermined time. After that, the fabric samples were removed from the solution and photographed.

[0059] Figure 5 shows photographs of fabric samples. When the fabric samples were immersed in artificial sweat solutions containing lactic acid at various concentrations, the patterns changed from circular to X-shaped. The X-shaped areas exposed to hydrogen peroxide retained their pigment, while the areas not exposed to hydrogen peroxide lost their pigment and became colorless.

[0060] (Example 2) Commercially available cotton cloth was cut into 40mm squares, washed with water and acetone, and then dried with a hairdryer. This cotton cloth was fixed onto an acrylic plate, 190 μL of a monomer solution with the same composition as in Example 1 was dropped onto it, and then UV (365 nm) light was irradiated onto the cotton cloth from the acrylic plate side. After 1 hour, the cotton cloth was removed, placed in a screw-top tube filled with water, stirred for 1 hour, and then air-dried. Stencil S1 shown in Figure 6 was placed on top of this cotton cloth, and colored by spraying with an aqueous solution containing 15 mM acid red 18. This cotton cloth was placed in a screw-top tube filled with water, stirred for 10 minutes, removed, and air-dried. Furthermore, stencil S2 shown in Figure 6 was placed on top of this cotton cloth, sprayed with 450 mM hydrogen peroxide solution, and then air-dried. Stencils S1 and S2 were made by cutting OHP sheets with a cutting machine so that they had holes of the predetermined shape.

[0061] (Test Example 2) Artificial sweat solutions were prepared by neutralizing sodium lactate with 0.01 equivalents of hydrochloric acid, adding sodium chloride, and then diluting with distilled water as appropriate, resulting in a lactate concentration of 0 mM or 100 mM and a sodium chloride concentration of 50 mM. Fabric samples were immersed in the artificial sweat solution and stirred in a 25°C incubator for a predetermined time. After that, the fabric samples were removed from the solution and photographed.

[0062] Figure 7 shows a photograph of a fabric sample. When the fabric sample was immersed in an artificial sweat solution containing lactic acid, the dye remained in the areas that were colored and exposed to hydrogen peroxide. In the areas that were colored but not exposed to hydrogen peroxide, the dye detached and became colorless. In the areas that were not colored but were exposed to hydrogen peroxide, the detached dye was adsorbed and the fabric became colored.

[0063] (Example 3) Commercially available cotton cloth was cut into 30mm squares, washed with water and acetone, and then dried with a hairdryer. 100 μL of monomer solutions with three different compositions, as shown in Table 1 below, were dropped onto the cotton cloth, which had been fixed to an acrylic plate with masking material attached to the back. The solvents for the monomer solutions were methanol and water (volume ratio 3:2). An OHP sheet printed black, excluding a circular light-transmitting area, was used as the masking material.

[0064] [Table 1]

[0065] The cotton cloth was irradiated with UV light (365 nm) from the masking material side for 1 hour, then placed in a screw-top tube filled with water and stirred for 1 hour. After that, the cotton cloth was immersed in an aqueous solution containing 1 mM tripotassium indigotrisulfonate as a dye and stirred for 1 hour, followed by stirring in water for 1 hour, after which it was removed and air-dried.

[0066] Similar to Test Example 2 above, the obtained fabric samples were immersed in an artificial sweat solution with a lactic acid concentration of 100 mM and stirred in a 25°C incubator for a predetermined time. After that, the fabric samples were removed from the solution and photographed.

[0067] Figure 8 shows a photograph of a fabric sample. When the molar ratio of monomer A, which has a boronic acid group, to monomer B, which has a cationic group, was 1.5, the dye was not sufficiently removed even after immersion in a 100 mM lactic acid aqueous solution for 60 minutes. At a molar ratio of 3.0, the removal of the dye was accelerated, and the sample became nearly colorless. Furthermore, at a molar ratio of 4.0, most of the dye was removed in response to lactic acid, resulting in a nearly colorless state.

[0068] This invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the meaning of the invention are considered to be within the scope of the invention. [Industrial applicability]

[0069] This invention is useful for clothing, particularly sportswear. [Explanation of symbols]

[0070] 1. Response area 2 Non-responsive areas 3 Adsorption area 10,20 Fabric

Claims

1. An exposure step in which the fabric is exposed to a first monomer having a boronic acid group and a second monomer having a cationic group, A polymerization step of polymerizing the first monomer and the second monomer and coating the fabric with the polymer product, A coloring step of coloring at least a portion of the region coated with the polymer with an anionic dye, A reaction step of exposing at least a portion of the region coated with the polymer to reactive oxygen species, A method for manufacturing fabric, including [specific details omitted].

2. In the reaction step, a portion of the colored region colored with the anionic dye is exposed to the reactive oxygen species. The method for manufacturing fabric according to claim 1.

3. In the reaction step, a portion of the colored region is masked as a response region, and the unmasked portion of the colored region, which is the non-response region, is exposed to the reactive oxygen species. The method for manufacturing fabric according to claim 2.

4. In the reaction step, a portion of the polymer-coated region that is different from the colored region colored with the anionic dye is exposed to the reactive oxygen species. The method for manufacturing fabric according to claim 1.

5. In the reaction step, a portion different from the colored region is designated as the adsorption region, the portion other than the adsorption region is masked, and the unmasked portion, the adsorption region, is exposed to the reactive oxygen species. The method for manufacturing fabric according to claim 4.

6. The molar ratio of the first monomer to the second monomer is: The range is 1.0 to 15.

0. A method for manufacturing fabric according to any one of claims 1 to 5.

7. The aforementioned reactive oxygen species are It is hydrogen peroxide. A method for manufacturing fabric according to any one of claims 1 to 5.

8. A response region having an anionic dye held by the cationic group in at least a portion of a region coated with a polymer which is a polymerization product obtained by polymerizing a first monomer having a boronic acid group and a second monomer having a cationic group, At least a portion of the region coated with the polymer has the anionic dye held by the cationic group, and the boronic acid group has reacted with a reactive oxygen species in a non-responsive region, A fabric that possesses these properties.

9. A response region having an anionic dye held by the cationic group in at least a portion of a region coated with a polymer which is a polymerization product obtained by polymerizing a first monomer having a boronic acid group and a second monomer having a cationic group, In the region coated with the polymer, an adsorption region is located at a position that does not overlap with the response region, where the boronic acid group has reacted with a reactive oxygen species, A fabric that possesses these properties.

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