Cooling fabric

Abstract

To improve durability of a cooling sensation of a cooling fabric.SOLUTION: A cooling fabric according to the present invention is characterized in that at least one surface of a fabric 11 knitted or woven with yarn containing a heat storage material carries, by a binder 12, at least one latent heat storage material (paraffin P) and at least one sugar alcohol (xylitol X).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cooling fabric. [Background technology]

[0002] With the recent increase in demand for comfort, textile products using various thermal functional materials have been developed. For example, Patent Document 1 (JP 2014-114528 A) discloses a fabric using a highly thermally conductive cool-to-the-touch fabric. Patent Document 2 (JP 5-156570 A) discloses a fabric in which paraffin, which has the property of absorbing heat when melted (latent heat), is encapsulated in microcapsules and supported on fibers with a binder.

[0003] Patent Document 3 (JP 2004-115964 A) discloses a fabric in which xylitol, which has the property of absorbing heat when melted (negative heat of solution), is supported on fibers with a binder. Patent Document 4 (JP 2020-45400 A) discloses a fabric that uses a latent heat storage material to maintain a cool or warm feeling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-114528 [Patent Document 2] Japanese Patent Application Publication No. 5-156570 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-115964 [Patent Document 4] JP 2020-45400 A DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] The highly thermally conductive cooling fabric of Patent Document 1 feels cool when touched, but after a while the fabric reaches the same temperature as the skin and the feeling of coolness disappears. The paraffin and xylitol of Patent Documents 2 and 3 absorb heat through the action of latent heat associated with a phase change from solid to liquid, or negative heat of solution, but the endothermic reaction (cooling effect) disappears when the solid phase disappears or the moisture disappears. The latent heat storage material of Patent Document 4 also utilizes heat absorption by melting due to a phase change, so like Patent Documents 2 and 3, there is room for improvement in the duration of the cooling sensation.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to improve the cooling sensation durability of a cooling sensation fabric. [Means for solving the problem]

[0007] To achieve the above-mentioned object, the cooling fabric of the present invention is characterized in that at least one type of latent heat storage material and at least one type of sugar alcohol are supported by a binder on at least one surface of a fabric knitted or woven with yarn containing a heat storage material. [Effects of the Invention]

[0008] According to the present invention, the duration of the cool sensation can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] 1(a) and 1(b) are conceptual diagrams of a cooling fabric according to one embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing the mechanism by which the cooling sensation of the cooling fabric lasts. DETAILED DESCRIPTION OF THE INVENTION

[0010] Cooling sensation fabrics according to embodiments of the present invention will be described below with reference to the drawings. Figures 1(a) and (b) are conceptual diagrams of a cooling sensation fabric 10 according to an embodiment of the present invention. The cooling sensation fabric 10 of Figure 1(a) has microcapsules 13 encapsulating paraffin P (a paraffin-based substance), which is a latent heat storage material, and xylitol X, which is a sugar alcohol, supported by a binder 12 on at least one surface of a raw material 11. The cooling sensation fabric 10 of Figure 1(b) has microcapsules 13 encapsulating paraffin P and microcapsules 13 encapsulating xylitol X supported by a binder 12 on at least one surface of a raw material 11.

[0011] The latent heat storage material is not limited to paraffin P (paraffin-based substance), and fatty acids, hydrated salts, etc. can also be used. The sugar alcohol is not limited to xylitol X, and erythritol, sorbitol, dulcitol, etc. can also be used.

[0012] Xylitol X can be kneaded into binder 12 without being encapsulated in microcapsules 13 as shown in Figure 1(a), or it can be encapsulated in microcapsules 13 together with paraffin P as shown in Figure 1(b). When xylitol X is encapsulated in microcapsules 13 as shown in Figure 1(b), the microcapsules 13 can be moisture-permeable. Paraffin P microcapsules 13 can be either moisture-impermeable or moisture-permeable.

[0013] Paraffin P is a type of latent heat storage material, and xylitol X is a type of sugar alcohol. Latent heat storage materials store and release heat by repeatedly changing the phase of the material. They store heat when they melt from a solid to a liquid phase, and release heat when they solidify from the liquid to a solid phase. Sugar alcohols have a negative heat of solution, so they can absorb moisture such as sweat and lower their temperature.

[0014] Fabric woven (knitted or woven) with yarn containing heat storage material can be used for the raw fabric 11. The yarn containing the heat storage material can have a core-sheath structure, with the heat storage material used in the core and synthetic fiber such as polyester used in the sheath.

[0015] Microcapsules are small airtight containers measuring several μm to several hundred μm in size. Capsules are composed of a substance that forms the wall and a core substance that forms the contents. By selecting the wall material and core substance, they can be used for a variety of purposes. In the present invention, they are used to increase the duration of the cooling sensation of fabrics.

[0016] The microcapsules may be commercially available products. Examples of such commercially available products include Prethermo manufactured by Yamato Chemical Industry Co., Ltd. and heat and cold storage microcapsules manufactured by Miki Riken Kogyo Co., Ltd. The composition of the microcapsules is not particularly limited. Compositions such as acrylic, melamine, urethane, and gelatin may be used.

[0017] The peak temperature for heat absorption (melting point) or the peak temperature for heat dissipation (freezing point) of the microcapsules can be set within the range of 20 to 35°C. While the human body temperature is 36 to 37°C, the surface temperature of the hands and feet can be lower, at 32 to 34°C. Therefore, a phase transition material with a peak temperature for heat absorption (melting point) of 20 to 35°C is preferred. A more preferred peak temperature (melting point) is 25 to 32°C.

[0018] If the peak heat absorption temperature is too low, the phase change material will melt before the human body comes into contact with it, and no cooling effect will be achieved even when the human body comes into contact with it.If the peak heat absorption temperature is too high, the phase change material will not melt even when the human body comes into contact with it, and no cooling effect will be achieved.

[0019] ●Mechanism of sustained cooling sensation (1) to (4) in Figure 2 show the mechanism by which the cooling sensation of the cooling sensation fabric 10 in Figure 1(a) lasts. When the temperature around the fabric (skin temperature) rises as shown in (1) ⇒ (2), the paraffin P in the microcapsules 13 held in the raw fabric 11 by the binder 12 absorbs the heat and melts. The heat storage material in the yarn of the raw fabric 11 also absorbs the heat. This reduces the rise in the wearer's surface temperature.

[0020] (2) ⇒ (1) When the skin temperature and fabric temperature drop, the melted paraffin P solidifies again. Xylitol X is readily soluble in water, but its melting point is 93-94°C, so at stages (1) and (2), xylitol X remains in a solid state.

[0021] When the heat around the raw material 11 exceeds the heat storage capacity of the heat storage material of the raw material 11, the wearer begins to sweat. As a result, the moisture evaporating from the wearer's skin and the moisture from sweat absorbs and melts the xylitol X exposed on the surface of the binder 12, as shown in (2) ⇒ (3), and the xylitol X absorbs the heat of fusion. This causes the temperature of the fabric and the temperature of the wearer's skin to drop, as shown in (3) ⇒ (4).

[0022] When the skin temperature drops as shown in (4), the melted paraffin P resolidifies. When the temperature rises again, the re-solidified paraffin P melts again and absorbs heat as shown in (4) ⇒ (3). In this way, the cooling effect can be maintained longer than before.

[0023] Specifically, the set temperature at which heat storage begins for the yarn containing the heat storage material is set to, for example, 27°C, and the melting temperature of the paraffin P is set to, for example, 27°C. When the ambient temperature rises and exceeds 27°C, the paraffin P and the heat storage material undergo an endothermic reaction as shown in (1) ⇒ (2), and the fabric tries to maintain 27°C. When the paraffin P and the heat storage material exceed their allowable capacity (heat storage capacity), the temperature around the raw fabric 11 rises, and the wearer begins to feel hot.

[0024] When the wearer begins to feel hot, sweating becomes active in order to lower their body temperature. As a result, the moisture and sweat evaporating from the skin absorbs and dissolves Xylitol X (as shown in (2) ⇒ (3)), causing an endothermic reaction and lowering the temperature around the source material 11 (as shown in (3) ⇒ (4)).

[0025] When the temperature around the raw material 11 drops and falls below the 27°C set temperature at which the heat storage material starts to store heat and the 27°C set temperature at which the paraffin P melts, the paraffin P solidifies as shown in (4), and the heat storage material releases heat, maintaining the temperature at 27°C. If the heat absorption effect of xylitol X is sufficient, the paraffin P in the microcapsules 13 will all solidify as the temperature drops below 27°C due to sweat. Then, when the temperature begins to rise, the paraffin P will melt again as shown in (4) ⇒ (3), causing an endothermic reaction and prolonging the cooling effect.

[0026] Also, if you sweat and stay wet, your body may get too cold if there is wind or the outside temperature is low. However, with the addition of paraffin P and heat storage material, when the skin temperature drops, the paraffin P and heat storage material dissipate the heat of coagulation, which helps prevent the skin temperature from dropping too low.

[0027] The paraffin P microcapsules 13 in Figure 1(a) and the binder 12 that supports xylitol X in the raw material 11 can be made of materials that gradually wear away with washing. By using such a binder 12, new xylitol X in the binder 12 can be exposed to the surface of the binder 12 with each washing, thereby increasing the durability of the endothermic effect of xylitol X.

[0028] When xylitol X is also encapsulated in microcapsules 13 as shown in Figure 1(b), the microcapsules 13 are moisture-permeable to enable moisture absorption (absorption of heat of fusion) of xylitol X. In this case, the binder 12 may be wash-resistant. In that case, it is preferable that the binder 12 is water-absorbent to facilitate moisture absorption of xylitol X. Furthermore, if the raw fabric 11 using yarn made of heat-storing material has a cool-to-the-touch function, it will feel cool from the very beginning of wearing it.

[0029] The first polymer as a heat storage material The yarn F-1 containing the heat storage material of the present invention can also be obtained by spinning a resin composition containing the first polymer described below (hereinafter sometimes referred to as resin composition (D)).

[0030] Resin composition (D) may contain only the first polymer as a polymer component, or may contain a polymer different from the first polymer. When resin composition (D) contains a polymer different from the first polymer, the polymer may be a second polymer described below. When resin composition (D) contains the first polymer and the second polymer, it is preferable that the content of the first polymer is 30% by weight or more and 99% by weight or less, and the content of the second polymer is 1% by weight or more and 70% by weight or less, where the total amount of the first polymer and the second polymer is 100% by weight.

[0031] The melting enthalpy ΔHm of the first polymer measured by differential scanning calorimetry within a temperature range of 10°C to 60°C is 30 J / g or more, preferably 50 J / g or more, more preferably 60 J / g or more, and even more preferably 70 J / g or more. The upper limit of ΔHm is usually 200 J / g or less. ΔHm is measured according to the method described below. (Differential scanning calorimetry) <Melting peak temperature (Tm, unit: °C), glass transition temperature (Tg, unit: °C), enthalpy of fusion (ΔHm, unit: J / g)>

[0032] Using a differential scanning calorimeter (TA Instruments, DSC Q100), an aluminum pan containing about 10 mg of sample is heated and cooled in a nitrogen atmosphere in the following order of steps (1) to (4). (1) Hold at 200°C for 5 minutes. (2) The temperature is decreased from 200°C to -80°C at a rate of 5°C / min. (3) Keep at -80°C for 5 minutes. (4) The temperature is increased from -80°C to approximately 200°C at a rate of 5°C / min.

[0033] The differential scanning calorimetry curve obtained by the calorimetry in step (4) is taken as the melting curve. The melting curve is analyzed by a method in accordance with JIS K7121-1987 to obtain the melting peak temperature at which the melting endotherm is maximum.

[0034] The glass transition temperature is obtained by analyzing the melting curve according to a method in accordance with JIS K7121-1987. The enthalpy of fusion ΔHm (J / g) is obtained by analyzing the portion of the melting curve within the temperature range of 10 to 60°C according to a method in accordance with JIS K7122-1987.

[0035] For example, the number of structural units B described later in the first polymer and the L 16 By adjusting the number of carbon atoms in the , ΔHm can be set within the above range, and as a result, the heat storage performance of the yarn containing the heat storage material can be adjusted.

[0036] Preferably, the first polymer (one type of first polymer or a mixture of multiple first polymers) has a melting peak temperature Tm in the range of 10 to 60°C, more preferably 10 to 50°C, and even more preferably 10 to 40°C.

[0037] The melting peak temperature is the temperature at the apex of the melting peak obtained by analyzing the melting curve, and can be obtained by the procedure described in the Examples. When there are multiple melting peaks, the temperature at the apex of the melting peak with the largest amount of melting endotherm is taken as the melting peak temperature.

[0038] The first polymer has a molecular weight of more than 2000. The weight-average molecular weight of the first polymer measured by gel permeation chromatography (GPC) using an apparatus equipped with a light scattering detector is preferably 10,000 to 1,000,000, more preferably 50,000 to 750,000, and even more preferably 100,000 to 500,000. In measuring the weight-average molecular weight of the first polymer by gel permeation chromatography, the mobile phase is orthodichlorobenzene and the measurement temperature is 155°C.

[0039] The first polymer may be a polymer having a long-chain alkyl group or a long-chain ether group in the side chain, which may be branched and optionally substituted with a functional group. The polymer is not particularly limited, but examples include a polymer primarily composed of a (meth)acrylate having a long-chain alkyl group or a long-chain ether group in the side chain, which may be branched and optionally substituted with a functional group; a polymer primarily composed of a vinyl ester main chain having a long-chain alkyl group or a long-chain ether group in the side chain, which may be branched and optionally substituted with a functional group; a polymer primarily composed of a vinyl ether main chain having a long-chain alkyl group or a long-chain ether group in the side chain, which may be branched and optionally substituted with a functional group; and a polymer primarily composed of a polyolefin main chain having a long-chain alkyl group or a long-chain ether group in the side chain, which may be branched and optionally substituted with a functional group. The side chain is preferably a long-chain alkyl group, which may be branched and optionally substituted with a functional group, and a polymer primarily composed of a (meth)acrylate or polyolefin main chain is preferred. Examples of the first polymer include polymers described in JP 2015-091903 A, WO 2016 / 098674 A, WO 2017 / 217419 A, WO 2021 / 241432 A, and WO 2022 / 244848 A.

[0040] In one embodiment of the first polymer, the carbon number is 14 or more and 30 or less (C 14 ~ 30The first polymer preferably has a structural unit represented by the following formula (1) (sometimes referred to as structural unit B): [ka]

[0041] In formula (1), R 1 represents a hydrogen atom or a methyl group, L 11 represents a single bond, -CO-O-, -O-CO-, or -O-; L 12 represents a single bond, -CH-, -CH-CH-, -CH-CH-CH-, -CH-CH(OH)-CH-, or -CH-CH(CHOH)-; L 13 represents a single bond, —CO—O—, —O—CO—, —O—, —CO—NH—, —NH—CO—, —CO—NH—CO—NH—, —NH—, or —N(CH3)—; L 16 is C 14 ~ 30 represents an alkyl group represented by the formula: In addition, L 11 , L 12 , and L 13 In each of the horizontally written chemical formulas, the left side corresponds to the upper side of formula (1) (the main chain side of the polymer), and the right side corresponds to the lower side of formula (1) (the terminal side of the side chain of the polymer).

[0042] R 1 is preferably a hydrogen atom. 11 is preferably -CO-O-, -O-CO-, or -O-, more preferably -CO-O- or -O-CO-, and even more preferably -CO-O-. 12 is preferably a single bond, -CH2-, -CH2-CH2-, or -CH2-CH2-CH2-, more preferably a single bond. 13 is preferably a single bond, —O—CO—, —O—, —NH—, or —N(CH 3 )—, and more preferably a single bond.

[0043] L in Equation (1) 16 C is selected so that the composition containing the first polymer has good moldability. 14 ~ 30 C is an alkyl group. 14 ~ 30 The alkyl group of C 14 ~ 30 and C 14 ~ 30 Examples of branched alkyl groups include: L 6 is preferably C 14 ~ 30 and more preferably a straight chain alkyl group of C 14 ~ 24 and more preferably C 16 ~ 22 is a straight chain alkyl group.

[0044] R in Equation (1) 1 , L 11 , L 12 , L 13 The combination is preferably: [ka]

[0045] R in Equation (1) 1 , L 11 , L 12 , L 13 As a combination of 1 is a hydrogen atom, and L 11 , L 12 , and L 13 is a single bond, and L 16 C 14 ~ 30 and R 1 is a hydrogen atom or a methyl group, and L 11 is -CO-O-, and L 2 and L 3 is a single bond, and L 16 C 14 ~ 30A combination of the alkyl groups represented by the formula (I) is also preferred.

[0046] R in Equation (1) 1 , L 11 , L 12 , and L 13 The combination is more preferably: [ka]

[0047] R in Equation (1) 1 , L 11 , L 12 , and L 13 The combinations are more preferably as follows: [ka]

[0048] The structural unit B is preferably n-hexadecene, n-octadecene, n-eicosene, n-docosene, n-tetracosene, n-hexacosene, n-octacosene, n-triacontene, n-dotriacontene, n-tetradecyl acrylate, n-pentadecyl acrylate, n-hexadecyl acrylate, n-heptadecyl acrylate, n-octadecyl acrylate, n-nonadecyl acrylate, or n-eicosyl acrylate. Acrylate, n-heneicosyl acrylate, n-docosyl acrylate, n-tricosyl acrylate, n-tetracosyl acrylate, n-pentacosyl acrylate, n-hexacosyl acrylate, n-heptacosyl acrylate, n-octacosyl acrylate, n-nonacosyl acrylate, n-triacontyl acrylate, n-tetradecyl methacrylate, n-pentadecyl methacrylate, n-hexa The vinyl ester may be derived from decyl methacrylate, n-heptadecyl methacrylate, n-octadecyl methacrylate, n-nonadecyl methacrylate, n-eicosyl methacrylate, n-heneicosyl methacrylate, n-docosyl methacrylate, n-tricosyl methacrylate, n-tetracosyl methacrylate, n-pentacosyl methacrylate, n-hexacosyl methacrylate, n-heptacosyl methacrylate, n-octacosyl methacrylate, n-nonacosyl methacrylate, n-triacontyl methacrylate, n-vinyltetradecylate, n-vinylhexadecylate, n-vinyloctadecylate, n-vinyleicosylate, n-vinyldocosylate, n-tetradecyl vinyl ether, n-hexadecyl vinyl ether, n-octadecyl vinyl ether, n-eicosyl vinyl ether, or n-docosyl vinyl ether.

[0049] The first polymer may have two or more types of structural units B, and may be, for example, a polymer having a structural unit derived from n-hexadecyl acrylate and a structural unit derived from n-octadecyl acrylate.

[0050] The first polymer is preferably a polymer having a structural unit derived from ethylene (sometimes referred to as structural unit A) so that the first polymer has good moldability and spinnability at temperatures equal to or higher than the peak melting temperature. The structural unit A is a structural unit obtained by polymerizing ethylene, and the structural unit A may form a branched structure in the polymer.

[0051] The first polymer is preferably a polymer having a structural unit B represented by formula (1) and a structural unit A derived from ethylene.

[0052] The first polymer may have a structural unit represented by the following formula (2) (sometimes referred to as structural unit C). [ka]

[0053] In formula (2), R 2 represents a hydrogen atom or a methyl group, and L 21 represents a single bond, -CO-O-, -O-CO-, or -O-; L 24 represents a single bond or a C1-8 alkylene group, L 25 represents a hydrogen atom, an epoxy group, —CH(OH)—CHOH, a carboxy group, a hydroxy group, an amino group, or a C1-4 alkylamino group. 1 In each of the horizontally written chemical formulas in the explanation of the chemical structure, the left side corresponds to the upper side of formula (2) (the main chain side of the polymer), and the right side corresponds to the lower side of formula (2) (the terminal side of the side chain of the polymer).

[0054] In equation (2), R 2 is preferably a hydrogen atom. 21 is preferably —CO—O—, —O—CO—, or —O—, more preferably —CO—O— or —O—CO—, and even more preferably —CO—O—.

[0055] In equation (2), L 24Examples of the C1-8 alkylene group as L include a methylene group, an ethylene group, an n-propylene group, a 1-methylethylene group, an n-butylene group, a 1,2-dimethylethylene group, a 1,1-dimethylethylene group, a 2,2-dimethylethylene group, an n-pentylene group, an n-hexylene group, an n-heptalene group, an n-octylene group, and a 2-ethyl-n-hexylene group. 24 is preferably a methylene group, an ethylene group, or an n-propylene group, more preferably a methylene group.

[0056] In equation (2), L 25 Examples of the C1-4 alkylamino group as L include a methylamino group, an ethylamino group, a propylamino group, a butylamino group, a dimethylamino group, and a diethylamino group. 25 is preferably a hydrogen atom, an epoxy group, or CH(OH)-CHOH, and more preferably a hydrogen atom.

[0057] R in Equation (2) 2 , L 21 , L 24 , L 25 The combination is preferably: [ka]

[0058] R in Equation (2) 2 , L 21 , L 24 , L 25 The combination is more preferably: [ka]

[0059] R in Equation (2) 2 , L 21 , L 24 , L 25 The combinations are more preferably as follows: [ka]

[0060] Examples of the structural unit represented by formula (2) include propylene, butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, acrylic acid, methacrylic acid, vinyl alcohol, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, tert-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, and tert-butyl methacrylate. The alkyl acrylates are derived from vinyl formate, vinyl acetate, vinyl propionate, vinyl(n-butylate), vinyl(isobutyrate), methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, sec-butyl vinyl ether, tert-butyl vinyl ether, glycidyl acrylate, glycidyl methacrylate, 2,3-dihydroxypropyl acrylate, 2,3-dihydroxypropyl methacrylate, 3-(dimethylamino)propyl acrylate, and 3-(dimethylamino)propyl methacrylate.

[0061] The first polymer may have two or more types of structural units C, and may be, for example, a polymer having a structural unit derived from methyl acrylate, a structural unit derived from ethyl acrylate, and a structural unit derived from glycidyl methacrylate.

[0062] The method for producing the first polymer is not particularly limited, and it can be produced, for example, by the methods described in WO 2021 / 241432, WO 2022 / 244848, etc.

[0063] Secondary polymer as heat storage material The yarn containing the heat storage material may contain a second polymer that is different from the first polymer. In one embodiment, the melting peak temperature or glass transition temperature of the second polymer is 50 to 180°C, preferably 60 to 120°C, and more preferably 70 to 110°C.

[0064] Examples of the second polymer having a melting peak temperature in the range of 60 to 120°C include high-pressure low-density polyethylene (LDPE), ethylene-α-olefin copolymer, and ethylene-vinyl acetate copolymer (EVA).

[0065] Examples of the second polymer having a glass transition temperature in the range of 60 to 120°C include cyclic olefin polymer (COP), cyclic olefin copolymer (COC), polystyrene (PS), polyvinyl chloride (PVC), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyethylene terephthalate (PET), polyacrylonitrile (PAN), polyamide 6 (PA6), polyamide 66 (PA66), polycarbonate (PC), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK).

[0066] The ethylene-α-olefin copolymer as the second polymer is a copolymer having structural units derived from ethylene and structural units derived from an α-olefin. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4-methyl-1-pentene, and 4-methyl-1-hexene, and these may be used alone or in combination of two or more. The α-olefin is preferably a C4-8 α-olefin, and more preferably 1-butene, 1-hexene, or 1-octene.

[0067] The density of the high-pressure low-density polyethylene (LDPE) and ethylene-α-olefin copolymer as the second polymer is 860 to 960 kg / m 3 .

[0068] In one embodiment, the second polymer has a structural unit A and a structural unit C, where the structural unit A and the structural unit C are as described for the first polymer. The second polymer is preferably a polymer in which the number of structural units A is 0 to 99% and the total number of structural units C is 1 to 100%, relative to 100% in total of the structural units A and C, and more preferably a polymer in which the number of structural units A is 70 to 99% and the total number of structural units C is 1 to 30%.

[0069] Examples of the second polymer include: Acrylic acid polymers, methacrylic acid polymers, vinyl alcohol polymers, methyl acrylate polymers, ethyl acrylate polymers, n-propyl acrylate polymers, n-butyl acrylate polymers, methyl methacrylate polymers, ethyl methacrylate polymers, n-propyl methacrylate polymers, n-butyl methacrylate polymers, vinyl formate polymers, vinyl acetate polymers, vinyl propionate polymers, vinyl (n-butylate) polymers, methyl vinyl ether polymers, ethyl vinyl ether polymers, n-propyl vinyl ether polymers, n-butyl vinyl ether polymers, maleic anhydride polymers, glycidyl acrylate polymers, glycidyl methacrylate polymers, 3-(dimethylamino)propyl acrylate polymers, 3-(dimethylamino)propyl methacrylate polymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene-vinyl alcohol copolymers, ethylene-methyl acrylate copolymers, ethylene- Ethyl acrylate copolymer, ethylene-n-propyl acrylate copolymer, ethylene-n-butyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-n-propyl methacrylate copolymer, ethylene-n-butyl methacrylate copolymer, ethylene-vinyl formate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl propionate copolymer, ethylene-vinyl (n-butylate) copolymer, ethylene-methyl vinyl ether copolymer, ethylene-ethyl vinyl ether copolymer, ethylene-n-propyl vinyl ether copolymer, ethylene-n-butyl vinyl ether copolymer, ethylene-maleic anhydride copolymer, ethylene-glycidyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-3-(dimethylamino)propyl acrylate copolymer, and ethylene-3-(dimethylamino)propyl methacrylate copolymer.

[0070] Preferably, the second polymer is an ethylene-based copolymer, such as an ethylene-unsaturated carboxylic acid copolymer, an ethylene-vinyl alcohol copolymer, an ethylene-unsaturated carboxylic acid ester copolymer, an ethylene-vinyl carboxylate copolymer, or an ethylene-alkyl vinyl ether copolymer. Examples of the ethylene-unsaturated carboxylic acid copolymer include ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, and ethylene-maleic anhydride copolymer.

[0071] Examples of ethylene-unsaturated carboxylic acid ester copolymers include ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-n-propyl acrylate copolymer, ethylene-n-butyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-n-propyl methacrylate copolymer, ethylene-n-butyl methacrylate copolymer, ethylene-glycidyl acrylate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-3-(dimethylamino)propyl acrylate copolymer, and ethylene-3-(dimethylamino)propyl methacrylate copolymer. Examples of ethylene-vinyl carboxylate copolymers include ethylene-vinyl formate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl propionate copolymer, and ethylene-vinyl (n-butylate) copolymer.

[0072] The second polymer is more preferably an ethylene-unsaturated carboxylic acid copolymer or an ethylene-unsaturated carboxylic acid ester copolymer, and even more preferably an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-vinyl alcohol copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-n-propyl acrylate copolymer, an ethylene-n-butyl acrylate copolymer, an ethylene-methyl methacrylate copolymer, an ethylene-ethyl methacrylate copolymer, an ethylene-n-propyl methacrylate copolymer, or an ethylene-n-butyl methacrylate copolymer.

[0073] From the viewpoint of moldability, the second polymer preferably has a melt flow rate (MFR) of 0.1 to 100 g / 10 min, more preferably 0.1 to 30 g / 10 min, measured in accordance with JIS K7210 at a temperature of 190°C under a load of 2.16 kgf.

[0074] The amount of ethylene structural units in the ethylene copolymer resin is preferably 50 to 99% by weight.

[0075] When resin composition (D) contains a polymer different from the first polymer and the polymer different from the first polymer is incompatible with the first polymer, a phase consisting of the first polymer and a phase consisting of the polymer different from the first polymer form a morphology such as a sea-island structure, a cylindrical structure, a lamellar structure, or a co-continuous structure.

[0076] The resin composition (D) may contain known additives as needed, such as inorganic fillers, organic fillers, flame retardants, crosslinking agents, antioxidants, weathering agents, ultraviolet absorbers, heat stabilizers, light stabilizers, lubricants, antiblocking agents, antistatic agents, antifogging agents, anti-dripping agents, crystal nucleating agents, pigments, dyes, adsorbents, metal chlorides, hydrotalcites, aluminates, silicone compounds, antibacterial agents, deodorizers, light-absorbing heat-generating materials, moisture-absorbing heat-generating materials, and far-infrared heat-generating materials.

[0077] The cross-sectional shape of the heat storage material-containing yarn F-1 (hereinafter sometimes referred to as fiber containing resin composition (D)) may be circular, irregular such as polygonal or multi-lobed, or hollow.

[0078] The single fiber fineness of the fiber containing the resin composition (D) is not particularly limited, but is preferably 1 dtex or more from the viewpoint of ease of fiber formation, and is preferably 20 dtex or less from the viewpoint of fiber flexibility.

[0079] Examples of methods for producing fibers containing resin composition (D) include dry spinning, wet spinning, and melt spinning, with melt spinning being preferred. General spinning methods use chips containing resin composition (D) as the raw material and mainly include two steps: spinning and drawing. Examples of spinning methods suitable for producing fibers include a continuous polymerization spinning method in which resin composition (D) is spun continuously from the resin composition (D) production process without chipping, a direct spinning and drawing method (spin-draw method) in which the spinning and drawing steps are performed in one step, a high-speed spinning method that does not require a drawing step, a POY-DTY method in which drawn yarn (DTY) is obtained through a false twisting step after forming a semi-drawn yarn (POY), and a spunbond method. These methods are more streamlined than the general spinning methods.

[0080] In one embodiment, the fiber containing the resin composition (D) may be a composite fiber. The composite fiber is a fiber formed by bonding two or more types of fibers made of different components together within a single yarn. Examples of the composite fiber include a core-sheath composite fiber, a bonded composite fiber, a splittable composite fiber, and an islands-in-the-sea composite fiber.

[0081] The single fiber fineness of the conjugated fiber containing the resin composition (D) is not particularly limited, but is preferably 1 dtex or more from the viewpoint of ease of fiber formation, and is preferably 20 dtex or less from the viewpoint of fiber flexibility.

[0082] The structure of the core-sheath composite fiber may be a core-sheath structure in which resin composition (D) is covered with a material different from resin composition (D) (hereinafter, sometimes referred to as "material (E)"), or a core-sheath structure in which material (E) is covered with resin composition (D), and preferably a core-sheath structure in which resin composition (D) is covered with material (E). Material (E) is preferably the second polymer, and more preferably polypropylene (PP), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyamide 6 (PA6), or polyamide 66 (PA66).

[0083] As a composite fiber having a core-sheath structure in which resin composition (D) is covered with material (E), a composite fiber having an area ratio of the core in the cross section in the fiber diameter direction of 10 to 90% is preferred. From the viewpoint of temperature regulating function, the area ratio of the core is preferably 10% or more, and from the viewpoint of fiber strength, the area ratio of the core is preferably 90% or less. When the core contains polypropylene, from the viewpoint of dyeability of the entire fiber, the area ratio of the core is preferably 20 to 60%.

[0084] Bonded composite fibers generally crimp due to differences in shrinkage rates, etc., but when the composite fiber is crimped spirally, the resin composition (D) may be on the inside of the spiral, or the material (E) may be on the inside of the spiral, and preferably the resin composition (D) is on the inside of the spiral in the bonded composite fiber. The material (E) is preferably the second polymer, and more preferably polypropylene (PP), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyamide 6 (PA6), or polyamide 66 (PA66).

[0085] Regarding the structure of the splittable conjugate fiber, when the splittable conjugate fiber is composed of a central radial fiber and multiple surrounding wedge-shaped fibers, the resin composition (D) may be the central radial fiber, or the material (E) may be the central radial fiber, and preferably the splittable conjugate fiber is the central radial fiber of the resin composition (D). The material (E) is preferably a second polymer, more preferably polypropylene (PP), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyamide 6 (PA6), or polyamide 66 (PA66). The splittable conjugate fiber may be split and opened by chemical treatment to obtain ultrafine fibers.

[0086] Regarding the structure of the islands-in-sea type composite fiber, the resin composition (D) may be the sea fiber, or the material (E) may be the sea fiber. Preferably, the islands-in-sea type composite fiber is the sea fiber. The material (E) is preferably a second polymer, more preferably polypropylene (PP), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyamide 6 (PA6), or polyamide 66 (PA66). In the islands-in-sea type composite fiber, the sea fiber may be removed by chemical treatment to obtain ultrafine fibers composed of a plurality of island fibers.

[0087] Examples of the form of the fiber containing the resin composition (D) include long fibers (multifilament, monofilament) and short fibers (staple). The long fibers (multifilament, monofilament) may be used as they are, or may be false-twisted to form a false-twisted yarn, or may be air-blended to form a blended yarn. The short fibers (staple) may be used as they are, or may be spun to form a spun yarn, or may be blended to form a blended yarn. They may be core-spun yarns in which long fibers are combined with short fibers, or may be twisted to form a doubled-twisted yarn, a twisted yarn, or a covered yarn.

[0088] The fiber containing the resin composition (D) may contain additives such as antioxidants, pigments, dyes, antibacterial agents, deodorizers, antistatic agents, flame retardants, inert fine particles, light-absorbing heat-generating agents, moisture-absorbing heat-generating agents, far-infrared heat-generating agents, ultraviolet absorbers, ultraviolet scattering agents, infrared shielding agents, lubricants, oils, sizing agents, etc. The additives can be added during or after spinning.

[0089] The fabric or cloth containing the fiber containing the resin composition (D) may be any of woven fabric, knitted fabric, and nonwoven fabric. Examples of weaves include plain weave, twill weave, satin weave, and variations thereof, dobby, jacquard, etc. Examples of knitted structures include weft knitting, warp knitting, and variations thereof.

[0090] The fabric or nonwoven fabric containing fibers containing the resin composition (D) is not particularly limited in terms of basis weight, gauge, etc.

[0091] The woven fabric or nonwoven fabric containing fibers containing the resin composition (D) may consist solely of fibers containing the resin composition (D), or may be woven or knitted with other fibers. Other fibers include inorganic fibers such as carbon fiber, inorganic fiber, and metal fiber; refined fibers such as lyocell; regenerated fibers such as rayon, cupra, and polynosic; semi-synthetic fibers such as acetate, triacetate, and promix; synthetic fibers such as acrylic, acrylic fibers, vinylon, vinylidene, polyvinyl chloride, polyethylene, polychlor, aramid, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyamide 6 (PA6), polyamide 66 (PA66), and urethane; natural fibers such as plant fibers such as cotton, cellulosic fibers, and hemp (flax, ramie, hemp, and jute); and animal fibers such as wool, sheep's wool, animal hair (angora, cashmere, mohair, alpaca, camel, and the like), and silk; and feathers such as down and feathers. The proportion of the fiber containing the resin composition (D) is not particularly limited, but is preferably 25 to 100% by weight.

[0092] ● Implementation form (Synthesis Example 1) In an autoclave reactor, ethylene and methyl acrylate were copolymerized using tert-butyl peroxypivalate as a radical polymerization initiator at a reaction temperature of 195°C and a reaction pressure of 160 MPa to synthesize an ethylene-methyl acrylate copolymer (corresponding to a precursor polymer). The MFR of the copolymer measured in accordance with JIS K7210 (temperature 190°C, load 21 N) was 34 g / 10 min.

[0093] The NMR spectrum of the ethylene-methyl acrylate copolymer was measured using a nuclear magnetic resonance spectrometer (AVANCE III 600HDNMR, manufactured by Bruker Biospin) under the conditions shown below. The NMR spectrum determined that the ethylene-methyl acrylate copolymer contained 84.1 mol% of structural units derived from ethylene (ethylene units), and 15.9 mol% of structural units derived from methyl acrylate (methyl acrylate units). Measurement probe: 10mm cryoprobe Measurement solvent: 1,2-dichlorobenzene / 1,1,2,2-tetrachloroethane-d2 = 85 / 15 (volume ratio) mixture Sample concentration: 100 mg / mL Measurement temperature: 135℃ Measurement method: Proton decoupling method Number of times accumulated: 256 Pulse width: 45 degrees Pulse repetition time: 4 seconds Measurement standard: tetramethylsilane

[0094] (Synthesis Example 2) After replacing the inside of a reactor equipped with a stirrer with nitrogen, 30 parts by weight of 1-hexadecanol (manufactured by GODREJ), 63 parts by weight of 1-octadecanol (manufactured by GODREJ), and 0.60 parts by weight of tetraisopropyl orthotitanate (manufactured by Nippon Soda Co., Ltd.) were added to 100 parts by weight of ethylene-methyl acrylate, and the mixture was heated and stirred at an internal temperature of 145°C to 150°C for 4 hours at a minimum pressure of 0.1 kPa to synthesize Polymer A-1 (corresponding to the first polymer), which is an ethylene-n-hexadecyl acrylate-n-octadecyl acrylate-methyl acrylate copolymer. Polymer A-1 contained 84.1 mol% of ethylene units (structural unit A), 13.2 mol% of n-octadecyl acrylate and n-hexadecyl acrylate units (structural unit B), and 2.7 mol% of methyl acrylate units (structural unit C). Furthermore, differential scanning calorimetry revealed that the ΔHm of polymer A-1 was 86 J / g.

[0095] (Production Example 1) The polymer A-1 obtained in Synthesis Example 2 was 73.4 parts by mass, and the second polymer was Acrylate WH206-F (ethylene-methyl methacrylate copolymer, melting peak temperature 86°C, manufactured by Sumitomo Chemical Co., Ltd.) was 23.8 parts by mass. The crosslinking agent was CH-12 (a mixture containing 8% by weight of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane and 92% by weight of polypropylene, manufactured by NOF Corporation) (1-minute half-life temperature: 180°C). The antioxidant was IRGANOX1010 (pentaerythritol tetrakis[3-(3',5'-di-tert-butylperoxy)hexane]) (1-minute half-life temperature: 180°C). 0.1 parts by mass of a copolymer of 1,2-dimethyl-2,3-trimethyl-2,4-trimethyl-2,5-trimethyl-1,2 ... Furthermore, Excellen VL VL700 (linear low-density polyethylene, melting peak temperature 90 ° C., manufactured by Sumitomo Chemical Co., Ltd.) was fed to a single-screw extruder (screw diameter D = 20 mm) as a packaging material, and melt-kneaded at a screw rotation speed of 74.0 Hz, a discharge rate of 8 kg / hr, and a barrel temperature of 190 to 240 ° C. to produce a sheet-shaped packaging material. Next, using a multilayer sheet molding machine equipped with a multilayer die, resin composition D-1 and the packaging material were multilayer extruded at a die temperature of 240 ° C. so that the outer layer / inner layer / outer layer was packaging material / resin composition D-1 / packaging material and the mass ratio of outer layer / inner layer / outer layer was 4.5 / 150 / 4.5, to produce pellets of packaged resin composition D-1.

[0096] Using 30 parts by mass of the resin composition D-1 prepared in Production Example 1 and 70 parts by mass of polyester as material (E), a core-sheath type composite fiber with a sheath of polyester and a core of the resin composition D-1 was spun to obtain yarn F-1 containing a heat storage material. The yarn F-1 containing the heat storage material had a 75 denier-36 filament and a single yarn fineness of 2.1 dtex.

[0097] Example 1 The fabric was knitted using 50% of the yarn F-1 containing the heat storage material, and the rest was general-purpose polyester fiber. Microcapsules containing paraffin and xylitol were applied discretely to one side of the knitted fabric using an acrylic binder to obtain a cooling fabric. The fabric was made in bare jersey, but other weaves are also acceptable.

[0098] Here, "bare jersey" refers to a jersey fabric with polyurethane (a rubber material) knitted into the surface yarn, and is a stretchy material. In industry jargon, "bare" means to stretch and shrink. The structure of "bare jersey" is excellent in stretchability and recovery, and is characterized by a gentle fit that clings to the skin.

[0099] The density of the courses and wells of the fabric is 84 threads / inch and 74 threads / inch. A coarser course and well density improves breathability, but reduces the amount of heat storage material, so the product of the course density per inch and the well density should be between 4,000 and 10,000. The application rate relative to the fabric area was set to 50%. If the product of the course density per inch and the well density is small, it is preferable to adjust the application rate to 80-90%. The microcapsules containing paraffin accounted for 10% of the application amount, and xylitol also accounted for 10% of the application amount. The total application amount, including the binder, was 40 g / m 2 The total amount of coating is 30g / m 2 from 50g / m 2 This is the amount of application when the application rate to the area of ​​the fabric is 50%, and if the application rate changes, the optimal amount of application will also change.

[0100] Example 2 A cooling fabric was obtained by discretely applying microcapsules containing paraffin and xylitol with an acrylic binder to one side of a fabric knitted using 100% of the yarn F-1 containing the heat storage material. The application rate relative to the fabric area was 50%. The microcapsules containing paraffin accounted for 10% of the application amount, and the xylitol accounted for 10% of the application amount. The total application amount, including the binder, was 40 g / m 2 is.

[0101] Comparative Example 1 The fabric used was 50% F-1 yarn containing heat storage material, and the rest was knitted using general-purpose polyester fiber.

[0102] Comparative Example 2 Only fabric knitted using 100% F-1 yarn containing heat storage material was used.

[0103] Comparative Example 3 The fabric used was made by discretely applying microcapsules containing paraffin and xylitol with an acrylic binder to one side of a regular two-way stretch fabric made of nylon and polyurethane. The application rate relative to the fabric area was 50%. The microcapsules accounted for 10% of the application amount, and the xylitol was 10% of the application amount. The application amount was 40 g / m 2 is.

[0104] The cumulative heat consumption was measured for each of the above-mentioned Examples and Comparative Examples. (Measurement of cumulative calorie consumption (index of sustained cooling sensation)) The sustained cooling sensation was evaluated by conducting a contact heat transfer test at Unitika Garment Tech Co., Ltd.

[0105] In the contact heat transfer test, fabric cut into 20cm squares is conditioned in an environment of 20°C and 65% RH, a 5cm square hot plate heated to 30°C is placed on the fabric, electricity is supplied to maintain the hot plate at 30°C, and the cumulative value of the heat consumed (hereinafter sometimes referred to as cumulative heat consumption) is calculated. The cumulative heat consumption is defined as the cumulative value of the heat consumed from 0 to 60 seconds, with the time when the fabric is in contact with the hot plate being 0 seconds. The larger the cumulative heat consumption value, the greater the amount of heat transferred in a certain period of time, and the longer the sustained cooling sensation can be said to be.

[0106] The cumulative heat consumption was 581 J / (m 2 ℃), and Comparative Example 1 was 651 J / (m 2 °C), and Comparative Example 2 is 711 J / (m 2 ° C.), and Example 2 is 738 J / (m 2 ° C.), and Example 1 is 779 J / (m 2 The higher the value, the longer the temperature rise can be suppressed.

[0107] It was found that fabric made of 50% heat-storing material F-1 yarn and coated with paraffin and xylitol was more effective in suppressing temperature rise than fabric made of 100% heat-storing material F-1 yarn and coated with paraffin and xylitol.

[0108] From the above results, it was found that the combination of fabric using thread F-1 containing the heat storage material of the present invention with paraffin and xylitol was much more effective in suppressing temperature rise than the combination of fabric not containing the heat storage material with paraffin and xylitol, and that the fabric using 50% thread F-1 containing the heat storage material used in Comparison Example 1 was more effective in suppressing temperature rise than the fabric used in Comparison Example 3.Therefore, even if paraffin and xylitol were applied to the fabric used in Comparison Example 1 in the same manner as Comparison Example 3, it would normally not be as effective as the fabric using 100% thread F-1 containing the heat storage material used in Comparison Example 2.However, it was found that Example 1 of the combination of the present invention was more effective in suppressing temperature rise than doubling the use ratio of thread F-1 containing the heat storage material.

[0109] The present invention has been specifically described above based on an embodiment, but it goes without saying that the present invention is not limited to the above embodiment and can be modified in various ways within the scope of the technical idea described in the claims. [Explanation of symbols]

[0110] 10: Cooling fabric 11: Wilderness 12: Binder 13: Microcapsules P: Paraffin X: Xylitol

Claims

1. The cooling fabric is characterized in that at least one type of latent heat storage material and at least one type of sugar alcohol are supported by a binder on at least one surface of the fabric knitted or woven with a yarn containing a heat storage material.

2. 2. The cooling fabric according to claim 1, wherein the latent heat storage material is a paraffin-based substance encapsulated in microcapsules.

3. 2. The cooling dough according to claim 1, wherein the sugar alcohol is xylitol, erythritol, sorbitol or dulcitol.

4. The cooling fabric according to any one of claims 1 to 3, characterized in that the yarn containing the heat storage material contains a first polymer having a melting enthalpy (ΔHm) of 30 J / g or more as observed by differential scanning calorimetry in a temperature range of 10°C or more and less than 60°C.

5. The yarn containing the heat storage material is the first polymer; and a second polymer other than the first polymer, the second polymer having a melting peak temperature or glass transition temperature measured by differential scanning calorimetry of 50° C. or higher and 180° C. or lower; When the total amount of the first polymer and the second polymer is taken as 100% by weight, the content of the first polymer is 30% by weight or more and 99% by weight or less, and the content of the second polymer is 1% by weight or more and 70% by weight or less. The cooling fabric according to claim 4.

6. The cooling fabric according to claim 4, wherein the first polymer has a structural unit represented by the following formula (1): 【Chemistry 1】 [(In formula (1), R 1 represents a hydrogen atom or a methyl group, L 11 represents a single bond, —CO—O—, —O—CO—, or —O—; L 12 is a single bond, -CH 2 -, -CH 2 -CH 2 -, -CH 2 -CH 2 -CH 2 -, -CH 2 -CH(OH)-CH 2 - or -CH 2 -CH(CH 2 OH)—, L 13 is a single bond, -CO-O-, -O-CO-, -O-, -CO-NH-, -NH-CO-, -CO-NH-CO-, -NH-CO-NH-, -NH-, or -N(CH 3 )-, L 16 represents an alkyl group having 14 to 30 carbon atoms.

7. The cooling fabric according to claim 5, wherein the first polymer has a structural unit represented by the following formula (1): 【Chemistry 2】 [(In formula (1), R 1 represents a hydrogen atom or a methyl group, L 11 represents a single bond, —CO—O—, —O—CO—, or —O—; L 12 is a single bond, -CH 2 -, -CH 2 -CH 2 -, -CH 2 -CH 2 -CH 2 -, -CH 2 -CH(OH)-CH 2 - or -CH 2 -CH(CH 2 OH)—, L 13 is a single bond, -CO-O-, -O-CO-, -O-, -CO-NH-, -NH-CO-, -CO-NH-CO-, -NH-CO-NH-, -NH-, or -N(CH 3 )-, L 16 represents an alkyl group having 14 to 30 carbon atoms.

8. The cooling fabric according to claim 4, characterized in that the yarn containing the heat storage material includes a core-sheath type composite fiber, and the core component contains the first polymer.

9. The cooling fabric according to claim 8, characterized in that the sheath component of the core-sheath type composite fiber contains a polyester resin or a polyamide resin.

10. A cooling fabric for clothing using the cooling fabric of any one of claims 1 to 3, characterized in that the cooling fabric for clothing is knitted and woven so as to be stretchable by 100% or more in one of the length and width directions and to be stretchable by 80% or more in the other of the length and width directions so as to fit closely to the skin.

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