Infrared absorbing fibers, knitted fabrics, or nonwoven fabrics

Abstract

To provide a woven fabric or a nonwoven fabric which include a near infrared absorbable pigment and can provide a desirable designability.SOLUTION: There are disclosed a near infrared absorbable woven fabric or a nonwoven fabric including a near infrared absorbable pigment, wherein the near infrared absorbable woven fabric or the nonwoven fabric is characterized by that the near infrared absorbable pigment includes one kinds or more kinds selected from a group comprising a specified composite tungsten oxide and a tungsten oxide having a Magneli phase, a content of the near infrared absorbable pigment per an area of the near infrared absorbable woven fabric or the nonwoven fabric is 0.05 g / m2 or over and 0.5 g / m2 or under, an L* in CIE1976 color space is 30 or over, and a color difference ΔE in CIE1976 color space between those of the near infrared absorbable woven fabric or the nonwoven fabric and those of the near infrared absorbable woven fabric or the nonwoven fabric when not including the near infrared absorbable pigment is 10 or under.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an infrared absorbing fiber, woven fabric, or nonwoven fabric. [Background technology]

[0002] Textile products that have the property of absorbing light and generating heat are known. For example, infrared absorbing pigments such as carbon black have the property of absorbing infrared light and generating heat, so that heat-generating fibers can be obtained by kneading or coating the pigment into fibers.

[0003] However, fibers containing carbon black as an infrared absorbing pigment have the problem that the color tone becomes extremely dark due to the black color of the carbon black, making it impossible to apply designs with light colors.

[0004] In this regard, Patent Document 1 describes Cs as an infrared absorbing pigment. 0.33 The document describes an infrared absorbing fiber that contains fine particles of a composite tungsten oxide, typically WO3, in which the content of the fine particles is 0.001 to 80% by weight based on the solid content of the fiber.

[0005] The composite tungsten oxide has a lighter color tone than the black color of carbon black, and therefore, textile products containing the composite tungsten oxide have the advantage of greater freedom in design compared to textile products containing carbon black. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2006-132042 A Summary of the Invention [Problem to be solved by the invention]

[0007] Complex tungsten oxides, such as Cs 0.33WO3 (hereinafter referred to as CsWO) exhibits a pale blue-green color that is visible under visible light, and when applied to a light-colored textile product, the color of the resulting textile product may be changed.

[0008] Generally, heat-generating cold weather clothing does not need to be made entirely of heat-generating textile products, but rather uses heat-generating textile products only in the parts of the clothing where heat generation contributes greatly to cold weather protection, with the other parts being made of normal textile products. In this case, if a textile product containing CsWO is used as the heat-generating textile product, a difference in color tone will occur between the parts containing CsWO and the parts not containing CsWO, which may cause design problems. This tendency is noticeable when the color tone of the desired clothing is particularly bright.

[0009] Furthermore, Patent Document 1 presents an unreasonably wide range of CsWO content in the infrared absorbing fiber, from 0.001 to 80% by weight based on the solid content of the fiber, which includes cases in which heat generation is insufficient and cases in which heat generation is excessive when used in cold weather clothing.

[0010] The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to provide a fiber, knitted or woven fabric, or nonwoven fabric that contains an infrared absorbing pigment and has the property of absorbing infrared rays and generating heat, and that can provide a preferable design when applied to clothing such as cold weather clothing. [Means for solving the problem]

[0011] The present invention, which solves the above problems, is as follows.

[0012] <Embodiment 1> An infrared absorbing fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment, L in CIE1976 color space * is 30 or more, and a color difference ΔE in CIE1976 color space between the infrared absorbing fiber, knitted fabric, or nonwoven fabric and a case in which the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less; Infrared absorbing fiber, knitted fabric, or nonwoven fabric. Aspect 2: The L in the CIE1976 color space * The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to embodiment 1, wherein the refractive index is greater than 90 and at least one of the following (i) to (iv) is satisfied: (i) a in the CIE1976 color space * is less than or equal to -10, (ii) a in the CIE1976 color space * is 10 or more, (iii) b in CIE1976 color space * is less than or equal to -10, and (iv) b in CIE1976 color space * is 10 or more. Aspect 3: The L in the CIE1976 color space * 2. The infrared absorbing fiber, knitted fabric, or nonwoven fabric according to claim 1, wherein the refractive index is 90 or less. <<Aspect 4>> The content of the infrared absorbing pigment is The infrared absorbing fiber is present in an amount of 0.01% by mass or more and 0.50% by mass or less based on the total mass of the infrared absorbing fiber, For the infrared absorbing woven or nonwoven fabric, 0.05 g / m per area of ​​the infrared absorbing woven or nonwoven fabric 2 More than 0.50g / m 2 Below is the The infrared absorbing fiber, knitted or woven fabric, or nonwoven fabric according to any one of aspects 1 to 3. Aspect 5: The infrared absorbing pigment is General formula M x W y O z (1) In the formula (1), M is one or more elements selected from the group consisting of H, He, an alkali metal element, an alkaline earth metal element, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; x, y, and z are each a positive number and 0 <x / y≦1であり、かつ2.2≦z / y≦3.0である} A composite tungsten oxide represented by the formula: General formula W y O z (2) {In the formula (2), W is tungsten, O is oxygen, y and z are each a positive number, and 2.45≦z / y≦2.999.} Tungsten oxide having a Magneli phase represented by The infrared absorbing fiber, knitted or woven fabric, or nonwoven fabric according to any one of aspects 1 to 4, comprising one or more selected from the group consisting of: Aspect 6: The infrared absorbing fiber according to any one of Aspects 1 to 5. Aspect 7: An infrared absorbing woven or nonwoven fabric, which is made from the infrared absorbing fiber according to aspect 6. Aspect 8: The fiber is made of the infrared absorbing fiber according to aspect 6 and a fiber that does not contain an infrared absorbing pigment, The fiber not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber. Infrared absorbing woven or nonwoven fabric. Aspect 9: The infrared absorbing woven or nonwoven fabric according to any one of Aspects 1 to 5. Aspect 10: The infrared absorbing textile or nonwoven fabric according to aspect 9, which is composed of infrared absorbing fibers containing an infrared absorbing pigment. <Embodiment 11> The present invention is composed of an infrared absorbing fiber containing an infrared absorbing pigment and a fiber not containing an infrared absorbing pigment, The fiber not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber. 10. The infrared absorbing woven or nonwoven fabric according to claim 9. Aspect 12: An infrared absorbing garment comprising the infrared absorbing woven or nonwoven fabric according to any one of aspects 7 to 11. Aspect 13: The infrared absorbing textile or nonwoven fabric according to any one of aspects 7 to 11 is composed of a textile or nonwoven fabric that does not contain an infrared absorbing pigment, The textile or nonwoven fabric not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing textile or nonwoven fabric. Infrared absorbing clothing. Effect of the Invention

[0013] According to the present invention, there is provided a fiber, knitted fabric, or nonwoven fabric which contains an infrared absorbing pigment and has the property of absorbing infrared rays and generating heat, and which can provide a preferable design when applied to clothing such as cold weather clothing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention is An infrared absorbing fiber, knitted fabric, or nonwoven fabric containing an infrared absorbing pigment, L in CIE1976 color space * is 30 or more, and The color difference ΔE in CIE1976 color space between the infrared absorbing fiber, knitted fabric, or nonwoven fabric and a case in which the infrared absorbing fiber, knitted fabric, or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less.

[0015] The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention further comprises: L in CIE1976 color space * The infrared absorbing fiber, knitted fabric, or nonwoven fabric may have a refractive index of more than 90 and satisfy at least one of the following (i) to (iv): (i) a in the CIE1976 color space * is less than or equal to -10, (ii) a in the CIE1976 color space * is 10 or more, (iii) b in CIE1976 color space * is less than or equal to -10, and (iv) b in CIE1976 color space * is 10 or more.

[0016] The infrared absorbing fiber, knitted fabric, or nonwoven fabric of the present invention may alternatively be L in CIE1976 color space * is less than or equal to 90, The material may be an infrared absorbing fiber, knitted fabric, or nonwoven fabric.

[0017] In this specification, the term "woven fabric" includes both woven fabric and knitted fabric. The term "nonwoven fabric" refers to a sheet-like material made by intertwining fibers, and does not include woven fabric or knitted fabric. Hereinafter, fibers, woven fabrics, and nonwoven fabrics may be collectively referred to as "textile products."

[0018] In this specification, the L in the CIE 1976 color space of the infrared absorbing fiber product is also referred to as * "L" is 30 or more. * The color difference ΔE in the CIE 1976 color space between an infrared absorbing textile product and a textile product not containing the infrared absorbing pigment is sometimes referred to as the "ΔE requirement."

[0019] The color difference ΔE is calculated by dividing the color of the infrared absorbing fiber product in the CIE1976 color space (L * ,a * ,b * ), and the color in the CIE1976 color space when the infrared absorbing fiber product does not contain an infrared absorbing pigment is (L0 * ,a0 * ,b0 * ) is the value expressed by the following formula. ΔE = {(L * -L0 * ) 2 +(a * -a0 * ) 2 +(b * -b0 * ) 2} 1 / 2

[0020] In order to solve the problems of the present invention, the present inventors The color tone of a textile product when it does not contain an infrared absorbing pigment, and The amount of infrared absorbing pigment contained in the infrared absorbing textile product; Change in color tone of a textile product when it contains a predetermined amount of infrared absorbing pigment; Heat generation and properties of textile products containing a specified amount of infrared absorbing pigment The relationship between these factors was examined in detail.

[0021] As a result, we found the following: (1) In the case of dark-toned textile products, the change in color tone between textile products that do not contain infrared absorbing pigments and textile products that do contain them is so small that it is not even an issue. (2) Among textile products with light colors, especially those with light colors, the change in color tone due to the inclusion of infrared absorbing pigments is easier to visually identify in textile products with low saturation than in textile products with bright colors with high saturation; and (3) By including infrared absorbing pigments in light-colored textile products to the extent that the change in color is difficult to discern, the products exhibit comfortable heat generation properties suitable for use as cold weather clothing.

[0022] The present invention has been made based on the above findings.

[0023] In the infrared absorbing fiber product of the present invention, L * When L is 30 or more, the color tone of the textile product is light enough that the inclusion of a significant amount of infrared absorbing pigment can cause a color tone change to become a problem. Therefore, even if a significant amount of infrared absorbing pigment is included, the color tone change is difficult to discern.* Dark color textiles having a color value of less than 30 are excluded from the scope of this invention.

[0024] In the infrared absorbing textile product of the present invention, the color difference ΔE in the CIE 1976 color space between when the product contains an infrared absorbing pigment and when it does not contain an infrared absorbing pigment is 10 or less, which means that the textile product contains the infrared absorbing pigment to a degree that makes it difficult to distinguish a change in color tone. A textile product that satisfies this requirement can have comfortable heat generating properties as cold weather clothing, and at the same time, it can reduce the difference in color tone with parts that do not contain the infrared absorbing pigment, thereby enabling it to exhibit favorable design properties.

[0025] When the brightness of the color tone of the infrared absorbing textile product of the present invention is particularly high, the inclusion of an infrared absorbing pigment makes it easier to visually identify changes in the color tone of the textile product. In view of this, when the brightness of the color tone of the textile product is particularly high, a high saturation is advantageous in terms of making it difficult to visually identify changes in color tone. Therefore, when the brightness of the infrared absorbing textile product of the present invention is particularly high, for example, when the chroma of the textile product is low, the chroma of the textile product is low, and the chroma of the textile product is low, the chroma of the textile product is low. * If is more than 90, the following requirements (i) to (iv) are met: (i) a in the CIE1976 color space * is less than or equal to -10, (ii) a in the CIE1976 color space * is 10 or more, (iii) b in CIE1976 color space * is less than or equal to -10, and (iv) b in CIE1976 color space * is 10 or more It is preferable that at least one of the following conditions is satisfied.

[0026] On the other hand, when the brightness of the infrared absorbing fiber product of the present invention is not particularly high, for example, L * When the value of a is 90 or less, the change in color tone due to the inclusion of an infrared absorbing pigment is not particularly easy to discern visually.* or b * The present invention can be suitably applied regardless of the value of .

[0027] L of textile products in CIE1976 color space * , a * , and b * can be measured by the method described in the Examples below.

[0028] The present invention will be described in detail below.

[0029] Infrared absorbing textile products The infrared absorbing textile product of the present invention is An infrared absorbing textile product comprising an infrared absorbing pigment, L in CIE1976 color space * is 30 or more, and The color difference ΔE in the CIE 1976 color space between the infrared absorbing textile product and an infrared absorbing textile product that does not contain an infrared absorbing pigment is 10 or less.

[0030] The infrared absorbing textile product of the present invention is L in CIE1976 color space * The infrared absorbing fiber product may be an infrared absorbing fiber product having a refractive index of more than 90 and satisfying at least one of the following (i) to (iv): (i) a in the CIE1976 color space * is less than or equal to -10, (ii) a in the CIE1976 color space * is 10 or more, (iii) b in CIE1976 color space * is less than or equal to -10, and (iv) b in CIE1976 color space * is 10 or more.

[0031] The infrared absorbing fiber product of the present invention may be, L in CIE1976 color space * is less than or equal to 90, It may be an infrared absorbing textile product.

[0032] The color difference ΔE in the CIE1976 color space between the infrared absorbing textile product and the infrared absorbing textile product not containing the infrared absorbing pigment is 10 or less. If the ΔE between the two is 10 or less, it becomes difficult to visually distinguish the change in color tone caused by the textile product containing the infrared absorbing pigment. The ΔE value may be 9 or less, 8 or less, 6 or less, 5 or less, or 4 or less. In addition, the ΔE value may be 0 or more, more than 0, 0.5 or more, 1 or more, 2 or more, or 3 or more.

[0033] In infrared absorbing textile products, L in the CIE1976 color space * Even when L exceeds 90, that is, when the color tone of the textile product is particularly bright, if at least one of the above (i) to (iv) is satisfied, it is possible to make it difficult to visually identify the change in color tone caused by the inclusion of the infrared absorbing pigment in the textile product. * When the color difference ΔE is greater than 90, from the viewpoint of making it more difficult to visually distinguish a change in color tone, the color difference ΔE may be 5 or less, 4.5 or less, 4 or less, 3.5 or less, or 3 or less, and may be 0 or more, more than 0, 0.1 or more, 0.2 or more, 0.3 or more, 0.4 or more, or 0.5 or more.

[0034] However, L * When the L value is more than 90, in order to ensure that the color change is difficult to visually identify, the content of the infrared absorbing pigment in the textile product may be limited, and the heat generation may be limited. From this perspective, the L value in the CIE1976 color space of the infrared absorbing textile product * may be 90 or less.

[0035] This L * is appropriately set within the above range depending on the desired color tone of the textile product. For example, in the case of a textile product having a reddish color tone, L * is 90 or less, and may be 80 or less, 70 or less, 60 or less, or 50 or less. In the case of a textile product having a yellowish color tone, L *is 90 or less, and may be 89 or less, 88 or less, 87 or less, or 86 or less. In the case of textile products having a blue-based color tone, L * is 90 or less, and may be 80 or less, 60 or less, or 40 or less.

[0036] L * Even if the value is 90 or less, if the color tone of the textile product is relatively light, for example, L * When L exceeds 80, in order to ensure that the color change is difficult to visually discern, the color difference ΔE may be 8 or less, 7 or less, 6 or less, or 5 or less. * When the color difference ΔE is 80 or less, if the color difference ΔE is 10 or less, it becomes extremely difficult to visually distinguish the change in color tone.

[0037] <fiber> The infrared absorbing textile product of the present invention comprises a fiber and an infrared absorbing pigment.

[0038] The fibers in the infrared absorbing textile product of the present invention may be appropriately selected from, for example, synthetic fibers, semi-synthetic fibers, natural fibers, unbleached fibers, inorganic fibers, and mixed yarns composed of a plurality of these fibers. Among these, synthetic fibers are preferred in consideration of the dispersibility of the infrared absorbing pigment and the heat retention properties of the textile product.

[0039] Examples of synthetic fibers in the present invention include polyester fibers, polyolefin fibers, acrylic fibers, polyamide fibers, polyether ester fibers, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, etc., and any one of these may be appropriately selected for use.

[0040] The polyester fiber may be, for example, a fiber of polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, or the like.

[0041] The polyolefin fibers may be, for example, polyethylene, polypropylene, polystyrene, or the like fibers.

[0042] The acrylic fibers may be, for example, fibers made of polyacrylonitrile, acrylonitrile / vinyl chloride copolymer, or the like.

[0043] The polyamide fibers may be, for example, fibers made of nylon, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, aramid, or the like.

[0044] The fibers of the present invention may have a cross-section of any shape, such as circular, polygonal, flat, hollow, Y-shaped, star-shaped, sheath-core, etc.

[0045] The fibers of the present invention may be either staple or continuous.

[0046] Infrared absorbing pigments It is preferable that the infrared absorbing pigment in the infrared absorbing textile product of the present invention has the properties of absorbing infrared, preferably near-infrared, radiation and emitting heat, has a bright color tone, and does not excessively impair the freedom in terms of design of the infrared absorbing textile product of the present invention.

[0047] Examples of such infrared absorbing pigments include: General formula M x W y O z (1) In the formula (1), M is one or more elements selected from the group consisting of H, He, an alkali metal element, an alkaline earth metal element, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; x, y, and z are each a positive number and 0 <x / y≦1であり、かつ2.2≦z / y≦3.0である} A composite tungsten oxide represented by General formula W y O z (2) {In the formula (2), W is tungsten, O is oxygen, y and z are each a positive number, and 2.45≦z / y≦2.999.} Tungsten oxide having a Magneli phase represented by etc., and one or more of these may be appropriately selected and used.

[0048] Here, the alkali metal elements are elements in Group 1 of the periodic table excluding hydrogen atoms, the alkaline earth metal elements are elements in Group 2 of the periodic table excluding Be and Mg, and the rare earth elements are Sc, Y, and tantanide elements.

[0049] The composite tungsten oxide represented by the general formula (1) contains the element M. As a result, free electrons are generated, and an absorption band derived from these free electrons appears in the near-infrared wavelength region, making it suitable as a material that absorbs near-infrared rays with a wavelength of about 1,000 nm and generates heat.

[0050] If the value of x / y, which indicates the amount of element M added, is greater than 0, a sufficient amount of free electrons are generated and the near-infrared absorbing effect can be obtained sufficiently. The larger the amount of element M added, the greater the supply of free electrons and the greater the near-infrared absorbing effect, but the value of x / y is saturated at about 1. If the value of x / y is 1 or less, it is preferable because it is possible to avoid the generation of an impurity phase in the fine particle-containing layer. The value of x / y is preferably 0.001 or more, 0.2 or more, or 0.30 or more, and this value is preferably 0.85 or less, 0.5 or less, or 0.35 or less. The value of x / y is ideally 0.33.

[0051] In particular, when the element M in the general formula (1) is one or more of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, and Sn, it is preferable from the viewpoint of improving the optical properties and weather resistance as a near-infrared absorbing material, and it is particularly preferable when M is Cs.

[0052] Cs x W y O zWhen (0.25≦x / y≦0.35, 2.2≦z / Y≦3.0), it is preferable that the lattice constants of the a-axis be 7.4060 Å or more and 7.4082 Å or less, and the c-axis be 7.6106 Å or more and 7.6149 Å or less, in terms of optical properties in the near infrared region and weather resistance.

[0053] When the composite tungsten oxide represented by the general formula (1) has a hexagonal crystal structure or is composed of a hexagonal crystal structure, the infrared absorbing material fine particles have improved transmission in the visible light wavelength region and improved absorption in the near infrared wavelength region, which is preferable. When the cations of element M are added and present in the voids of the hexagonal crystal, the transmission in the visible light wavelength region is improved and the absorption in the near infrared wavelength region is improved. Here, generally, when an element M having a large ionic radius is added, a hexagonal crystal is formed. Specifically, when an element having a large ionic radius such as Cs, Rb, K, Tl, In, Ba, Sn, Li, Ca, Sr, or Fe is added, a hexagonal crystal is easily formed. However, it is not limited to these elements, and even if an element other than these elements is added, it is sufficient that the added element M exists in the hexagonal voids formed by the WO6 units.

[0054] When the composite tungsten oxide having a hexagonal crystal structure has a uniform crystal structure, the amount of the additive element M is preferably 0.2 or more and 0.5 or less, more preferably 0.30 or more and 0.35 or less, and ideally 0.33, in terms of the value of x / y. When the value of x / y is 0.33, it is considered that the additive element M is arranged in all of the hexagonal voids.

[0055] It is preferable that the composite tungsten oxide represented by the general formula (1) is treated with a silane coupling agent, since this has excellent dispersibility, near-infrared absorptivity, and transparency in the visible light wavelength region.

[0056] In the tungsten oxide having the Magneli phase represented by the general formula (2), the so-called "Magneli phase" having a composition ratio where the value of z / y satisfies the relationship of 2.45≦z / y≦2.999 is chemically stable and has good absorption characteristics in the near-infrared light wavelength region, and is therefore preferable as a near-infrared absorbing material.

[0057] In general formulas (1) and (2), the value of z / y indicates the level of oxygen content control. Since the z / y value of the composite tungsten oxide represented by general formula (1) satisfies the relationship of 2.2≦z / y≦3.0, in addition to the same oxygen control mechanism as that of the tungsten oxide represented by general formula (2), even when z / y=3.0, free electrons are supplied by adding element M. In general formula (1), it is more preferable that the z / y value satisfies the relationship of 2.45≦z / y≦3.0.

[0058] In addition, due to the raw material compound used in the manufacture of the composite tungsten oxide and tungsten oxide of the present invention, some of the oxygen atoms constituting the composite tungsten oxide and tungsten oxide may be replaced with halogen atoms.However, this does not cause any problem in the implementation of the present invention.Therefore, the composite tungsten oxide and tungsten oxide of the present invention also include the case where some of the oxygen atoms are replaced with halogen atoms.

[0059] The infrared absorbing pigment of the present invention largely absorbs light in the near infrared wavelength region, particularly at wavelengths around 1,000 nm, and therefore the transmitted color tone is often blue to green. However, since this coloring is pale, the infrared absorbing fiber product of the present invention containing the infrared absorbing pigment can provide a desirable design when applied to clothing such as cold weather clothing.

[0060] The content of the infrared absorbing pigment in the infrared absorbing fiber product of the present invention will be described later.

[0061] Infrared absorbing fiber The infrared absorbing fiber product of the present invention includes an infrared absorbing fiber.

[0062] Therefore, the infrared absorbing fiber of the present invention is 1. An infrared absorbing fiber comprising an infrared absorbing pigment, L in CIE1976 color space * is 30 or more, and The color difference ΔE in the CIE 1976 color space between the infrared absorbing fiber and the infrared absorbing fiber not containing the infrared absorbing pigment is 10 or less.

[0063] In this specification, the color of a fiber may be measured when the fiber is woven into a plain weave or tricot fabric.

[0064] The content of the infrared absorbing pigment in the infrared absorbing fiber of the present invention may be 0.01% by mass or more and 0.50% by mass or less, based on the total mass of the infrared absorbing fiber.

[0065] The content of the infrared absorbing pigment suitable for achieving comfortable heat generation while satisfying the ΔE requirement specified in the present invention may be 0.01 mass % or more, 0.05 mass % or more, 0.10 mass % or more, or 0.15 mass % or more, and may be 0.50 mass % or less, 0.40 mass % or less, 0.30 mass % or less, or 0.20 mass % or less, based on the total mass of the infrared absorbing fiber.

[0066] <Method of producing infrared absorbing fiber> The infrared absorbing fiber of the present invention may be produced by any suitable known method or a method with suitable modifications made by those skilled in the art.

[0067] The infrared absorbing fiber of the present invention is, for example, (1) A method in which an infrared absorbing pigment is directly mixed with the raw polymer of synthetic fibers and then spun into yarn; (2) A method in which a master batch is produced by blending an infrared absorbing pigment at a high concentration in a raw polymer of a synthetic fiber, and the master batch is mixed with a diluted polymer that does not contain an infrared absorbing pigment and spun; (3) A method of mixing an infrared absorbing pigment into a dope solution containing a raw material polymer for synthetic fibers and spinning the mixture; (4) A method of attaching an infrared absorbing pigment to at least one of the surface and the interior of a fiber that does not contain an infrared absorbing pigment. It may be produced by such methods.

[0068] The spinning in the above production methods (1), (2), and (3) may be wet spinning using a suitable solvent, or dry spinning such as melt spinning.

[0069] The infrared absorbing fiber of the present invention may contain a colorant such as a suitable pigment or dye in order to impart a desired color tone. The colorant may be added at any time during the production process of the infrared absorbing fiber.

[0070] Application of infrared absorbing fibers The infrared absorbing fibers of the present invention may be used, for example, to apply infrared absorbing textiles or nonwoven fabrics.

[0071] This infrared absorbing textile or nonwoven fabric may be composed only of the infrared absorbing fiber of the present invention, or may be composed of the infrared absorbing fiber of the present invention and other fibers. Here, the other fibers contain infrared absorbing pigments, but the L of the present invention is not limited. * The fiber may be one that does not satisfy at least one of the requirements and the ΔE requirement, or may be one that does not contain an infrared absorbing pigment.

[0072] However, in order to achieve the purpose of the present invention of providing a desirable design when applied to clothing, it is preferable to use, as the other fiber, one having a composition obtained by excluding the infrared absorbing pigment from the infrared absorbing fiber of the present invention.

[0073] That is, the infrared absorbing knitted or woven fabric or nonwoven fabric formed using the infrared absorbing fiber of the present invention has the following properties: Consisting solely of the infrared absorbing fibers of the present invention, or The infrared absorbing fiber of the present invention is composed of a fiber having a structure in which the infrared absorbing pigment is removed from the infrared absorbing fiber. It is preferable that:

[0074] The infrared absorbing fiber of the present invention has a predetermined L *It is sufficient that both the L requirement and the ΔE requirement are satisfied, and the infrared absorbing knitted or nonwoven fabric constructed using the infrared absorbing fiber of the present invention has the L requirement specified in the present invention as a whole. * The requirement and the ΔE requirement may both be satisfied, or at least one of them may not be satisfied.

[0075] The infrared absorbing knitted or woven fabric or nonwoven fabric constructed using the infrared absorbing fiber of the present invention is, for example, It may be woven in plain weave, satin, twill, etc.; It may be a knit such as a chain stitch, a knit stitch, a rib stitch, a double stitch, a regular double stitch, a slip stitch, a tricot, etc.; The nonwoven fabric may be one produced by any suitable method, such as a dry method, a wet method, a spunbond method, a melt-blowing method, a thermal bond method, a chemical bond method, a needle punch method, a spunlace method, a stitch bond method, or a steam jet method.

[0076] <Infrared absorbing knitted or nonwoven fabric> The infrared absorbing fiber product of the present invention includes infrared absorbing knitted or woven fabrics and nonwoven fabrics. Hereinafter, knitted or woven fabrics and nonwoven fabrics may be collectively referred to as "knitted or woven fabrics, etc."

[0077] The infrared absorbing knitted or woven fabric of the present invention is An infrared absorbing textile or the like containing an infrared absorbing pigment, L in CIE1976 color space * is 30 or more, and The color difference ΔE in CIE 1976 color space between the infrared absorbing textile fabric, etc. and a fabric, etc. that does not contain an infrared absorbing pigment is 10 or less.

[0078] The content of the infrared absorbing pigment in the infrared absorbing textile fabric of the present invention is 0.05 g / m per area of ​​the infrared absorbing textile fabric. 2 More than 0.50g / m 2 It may be the following:

[0079] The content of the infrared absorbing pigment suitable for realizing comfortable heat generation while satisfying the ΔE requirement of the present invention may vary depending on the color tone of the infrared absorbing textile fabric, etc. In the case of textile fabrics with bright warm color tones, for example, red and yellow tones, L * The value is relatively large, and the change in color tone caused by the inclusion of infrared absorbing pigment in textiles, etc. tends to be easily discerned by the naked eye. Therefore, the content of infrared absorbing pigment to satisfy the ΔE requirement is limited to an upper limit. In this case, the content of infrared absorbing pigment per area should be 0.01 g / m to achieve comfortable heat generation. 2 More than 0.03g / m 2 More than 0.05g / m 2 More than 0.06g / m 2 More than 0.08g / m 2 More than 0.10g / m 2 or more, or 0.12 g / m 2 or more, and to ensure compliance with the ΔE requirement, 0.50 g / m 2 Below 0.40g / m 2 Below 0.30g / m 2 Below 0.25g / m 2 or less than 0.20 g / m 2 It may be the following:

[0080] The color tone is particularly bright, e.g., L * When the value is more than 80 or more than 90, the content of the infrared absorbing pigment per area is set to 0.30 g / m from the viewpoint of making it more difficult to visually distinguish the color tone change. 2 Below 0.25g / m 2 Below, 0.20g / m 2 Below 0.15g / m 2 Below, 0.12g / m 2 or less than 0.10 g / m 2 It may be the following:

[0081] On the other hand, in the case of darker, cooler colors, such as blue-toned textiles, L *The value is relatively small, and the change in color tone caused by the inclusion of infrared absorbing pigment in textiles tends to be difficult to visually identify. Therefore, even if a relatively large amount of infrared absorbing pigment is included, the ΔE requirement tends to be met. In this case, in order to achieve comfortable heat generation, a value of 0.05 g / m 2 More than 0.06g / m 2 More than 0.08g / m 2 More than 0.10g / m 2 or more, or 0.12 g / m 2 or more, and to ensure compliance with the ΔE requirement, 0.50 g / m 2 Below, 0.48g / m 2 Below, 0.46g / m 2 Below, 0.44g / m 2 Below, 0.42g / m 2 or less than 0.40 g / m 2 It may be the following:

[0082] <Configuration of infrared absorbing knitted fabric, etc.> The infrared absorbing textile fabric of the present invention may be composed only of infrared absorbing fibers containing an infrared absorbing pigment, or may be composed of infrared absorbing fibers containing an infrared absorbing pigment and fibers not containing an infrared absorbing pigment. Here, the fibers not containing an infrared absorbing pigment may have a structure in which the infrared absorbing pigment is removed from the infrared absorbing fibers, or may be composed of a material different from the infrared absorbing fibers.

[0083] However, in order to achieve the purpose of the present invention of providing a preferable design when applied to clothing, it is preferable to use, as the fiber not containing an infrared absorbing pigment, an infrared absorbing fiber having a structure in which the infrared absorbing pigment has been removed.

[0084] That is, the infrared absorbing knitted or woven fabric of the present invention has the following features: Consists solely of infrared absorbing fibers containing infrared absorbing pigments, or The infrared absorbing fiber is composed of an infrared absorbing fiber containing an infrared absorbing pigment and a fiber having a structure in which the infrared absorbing pigment is removed from the infrared absorbing fiber. It is preferable that:

[0085] The infrared absorbing textile fabric of the present invention has the specified L of the present invention as a whole. * It is sufficient that the fibers constituting the infrared absorbing knitted or woven fabric satisfy both the L requirement and the ΔE requirement of the present invention. * The requirement and the ΔE requirement may both be satisfied, or at least one of them may not be satisfied.

[0086] The infrared absorbing knitted or woven fabric of the present invention is made using the above-mentioned fiber, and for example, It may be woven in plain weave, satin, twill, etc.; It may be a knit such as a chain stitch, a knit stitch, a rib stitch, a double stitch, a regular double stitch, a slip stitch, a tricot, etc.; The nonwoven fabric may be manufactured by any suitable means, such as a fleece forming method (e.g., a dry method, a wet method, a spunbond method, a meltblowing method, etc.) or a fleece bonding method (e.g., a thermal bond method, a chemical bond method, a needle punch method, a spunlace method, a stitch bond method, a steam jet method, etc.).

[0087] (Method for producing infrared absorbing knitted fabric) The infrared absorbing textile fabric of the present invention may be produced by any suitable known method or a method with suitable modifications made by those skilled in the art.

[0088] The infrared absorbing textile fabric of the present invention is, for example, (1) A method for obtaining knitted fabrics by knitting infrared absorbing fibers; (2) A method for obtaining a fabric by weaving infrared absorbing fibers, or infrared absorbing fibers and fibers not containing infrared absorbing pigments; (3) A method of obtaining a nonwoven fabric by a suitable means such as a fleece forming method or a fleece bonding method using infrared absorbing fibers, or infrared absorbing fibers and fibers not containing infrared absorbing pigments; (4) A method of applying a coating liquid containing an infrared absorbing pigment to a textile or the like that does not contain an infrared absorbing pigment; It may be produced by such methods.

[0089] The coating liquid used in the method (4) may contain, for example, an infrared absorbing pigment and a suitable solvent, and may further contain a binder polymer or the like, if necessary, in order to improve adhesion between the infrared absorbing pigment and a textile or the like.

[0090] The infrared absorbing textile fabric of the present invention may contain a colorant such as a suitable pigment or dye in order to express a desired color tone. The colorant may be applied at any time during the manufacturing process of the infrared absorbing textile fabric. In particular, in the method (3) using a coating liquid, the colorant may be contained in the coating liquid.

[0091] Infrared absorbing clothing The present invention further provides an infrared absorbing garment.

[0092] The infrared absorbing clothing of the present invention may include an infrared absorbing knitted or woven fabric constituted from the infrared absorbing fiber of the present invention, and may include an infrared absorbing knitted or woven fabric of the present invention.

[0093] The infrared absorbing clothing of the present invention may be composed only of the infrared absorbing woven fabric etc. as described above, or may be composed of the infrared absorbing woven fabric etc. and a woven fabric etc. that does not contain an infrared absorbing pigment.

[0094] The textile fabric etc. that does not contain the infrared absorbing pigment may have a structure in which the infrared absorbing pigment is removed from the infrared absorbing textile fabric etc., or may be made of a different material.

[0095] However, in order to achieve the object of the present invention of providing a preferable design, it is preferable to use a textile fabric, etc. that does not contain an infrared absorbing pigment, which has a structure in which the infrared absorbing pigment has been removed from the infrared absorbing textile fabric, etc.

[0096] That is, the infrared absorbing clothing of the present invention is Consists solely of infrared absorbing textiles, etc., containing infrared absorbing pigments, or The present invention is composed of an infrared absorbing textile fabric containing an infrared absorbing pigment, and a textile fabric having a structure in which the infrared absorbing pigment has been removed from the infrared absorbing textile fabric. It is preferable that:

[0097] The infrared absorbing clothing of the present invention may be produced by a known method using the knitted or woven fabrics as described above. EXAMPLES

[0098] 1. Infrared absorbing knitted fabric In the following Examples and Comparative Examples, the following raw materials were used for sample preparation.

[0099] Infrared absorbing pigments (Cesium Tungsten Oxide) Manufactured by Sumitomo Metal Mining Co., Ltd., "YMS-01A-2", Cs 0.33 Dispersion containing 25% by weight of WO3 and propylene glycol monomethyl ether acetate as a solvent

[0100] Hereinafter, the above infrared absorbing pigment Cs 0.33 WO3 is referred to as "CsWO", and a dispersion containing the CsWO and a solvent is referred to as a "CsWO dispersion".

[0101] (Antimony doped tin oxide) Ishihara Sangyo Kaisha, Ltd., "ATO", 100% solids by weight

[0102] (Carbon Black) CABOT Furnace Black "R400R", solid content 100% by weight

[0103] <Binder polymer> Dainichi Seika Chemicals Co., Ltd., polyurethane resin solution "Rezamin ME-44ELPNS", solid content 30% by weight

[0104] Colored inks Red: Seiko Advance Co., Ltd., "MRJ RX02 510 American Red", solid content 37% by weight Yellow: Seiko Advance Co., Ltd., "MRJ RX02 NC200 Primrose Yellow", solid content 37% by weight Blue: Seiko Advance Co., Ltd., "MRJ RX02 440 Blue", solid content 37% by weight White: Seiko Advance Co., Ltd., "MRJ RX02 120 White", solid content 64% by weight

[0105] Comparative Example r1 (1) Preparation of ink 10.0 parts by weight of red ink (equivalent to 3.70 parts by weight of solid content), 54.0 parts by weight of urethane resin solution (equivalent to 16.20 parts by weight of solid content), and 36.0 parts by weight of methyl ethyl ketone (MEK) were mixed to prepare 100 parts by weight of red base ink with a red ink content of 10% by weight (wet / wet) and a solid content of 19.9% ​​by weight.

[0106] (2) Coating Using a Baker applicator, the ink obtained above was applied to a 100% polyester white fabric (334 μm thick woven fabric, L * 93.6, a * 1.9, b * The mixture was then left to stand at 100°C for 1 minute to remove the solvent, and a reference fabric sample was prepared.

[0107] (3) Evaluation (3-1) Evaluation of photothermal activity An Iwasaki Electric Co., Ltd. lighting eye lamp (model name "PRF250", rated voltage 100V, rated power consumption 250W, color temperature 3,200K, diffused light type) was placed 30cm away from the fabric sample cut into a 7cm x 7cm square, and light was irradiated. The fabric back surface temperature (temperature of the surface opposite to the surface irradiated with light) was measured before light irradiation (0 minutes) and 5 minutes after light irradiation, and the photoheat generation property of the fabric sample was calculated from the difference between the two.

[0108] The photoheating properties of the textile samples obtained here were used as the basis for calculating the photoheating effect of the infrared absorbing pigments in Examples R1 and R2, and Comparative Example r2.

[0109] (3-2) Color Tone Evaluation Using a spectrophotometer manufactured by X-Rite, model name "Spectroeye", the L in the CIE1976 color space was measured for the textile samples obtained above. * , a * , and b * The measurement was performed on a white paper (L * = 94.84, a * = 0.03, b * The test was performed with three layers of 0.44 mm square (0.24 mm thick) placed underneath the fabric sample.

[0110] The L of the fabric sample obtained here * , a * , and b * The value was used as the standard for calculating the color difference ΔE in Examples R1 and R2, and Comparative Example r2.

[0111] The fabric samples obtained here were used as standards for the sensory evaluation of color difference in Examples R1 and R2, and Comparative Example r2.

[0112] Example R1 (1) Preparation of ink An infrared absorbing red ink with a red ink content of 10% by weight (wet / wet) and a CsWO content of 0.15% by weight per ink solid content was prepared by adding 0.12 parts by weight of CsWO dispersion (corresponding to 0.030 parts by weight of CsWO) to 100 parts by weight of a red base ink prepared in the same manner as in Comparative Example r1.

[0113] (2) Coating Except for using the infrared absorbing red ink obtained above, a 100% polyester white fabric (woven fabric) was coated in the same manner as in Comparative Example r1 to prepare a woven fabric sample. Here, the dry weight of the coated ink was calculated from the difference in weight between the fabric before coating and the woven fabric sample after coating, and the content of the infrared absorbing pigment per unit area of ​​the woven fabric sample was calculated from the amount of infrared absorbing pigment contained therein and the area of ​​the coated surface.

[0114] (3) Evaluation (3-1) Evaluation of photothermal effect The obtained textile sample of Example R1 was used to evaluate the photoheating property and color tone in the same manner as in Comparative Example r1. The photoheating effect of the infrared absorbing pigment in the textile sample of Example R1 was calculated by subtracting the photoheating property value of the textile sample of Comparative Example r1 from the photoheating property value of the textile sample.

[0115] (3-2) Evaluation of color difference ΔE L of the fabric sample * , a * , and b * The value of L of the reference fabric sample of Comparative Example r1 * , a * , and b * From the values ​​of these, the color difference ΔE between the woven fabric sample of Example R1 and the standard of Comparative Example r1 was calculated.

[0116] (3-3) Sensory evaluation of color difference White backing paper (L * = 94.84, a * = 0.03, b * The fabric sample obtained in this example and the reference fabric sample obtained in Comparative Example r1 were placed side by side on three layers of woven fabric (fiberglass-like fiber, 0.44 mm diameter, 0.24 mm thick) and examined whether the difference in color tone between the two samples could be visually identified under daylight fluorescent lighting. The test was conducted by six testers and evaluated according to the following criteria. A: No tester (0 testers) could distinguish the difference in color tone between the two samples (good) B: Only one or two testers were able to distinguish the difference in color between the two samples (acceptable). C: Three or more testers were able to distinguish the difference in color tone between the two samples (failure).

[0117] Example R2 and Comparative Example R2 Infrared absorbing red inks were prepared in the same manner as in Example R1, except that the amount of CsWO dispersion added to 100 parts by weight of the red base ink was as shown in Table 1, and then the inks were applied to fabric and evaluated.

[0118] 《Comparative example r3》 Except for the amounts of urethane resin solution, red ink, and MEK used being as shown in Table 1, a red base ink with a red ink content of 30% by weight (wet / wet) and a solid content of 21.6% by weight was prepared in the same manner as in Comparative Example r1, and this was used to apply to fabric and evaluate.

[0119] The photothermal properties of the fabric samples obtained here and L * , a * , and b * The value was used as a criterion for calculating the photoheating effect and color difference ΔE of the infrared absorbing pigment in Examples R3 and R4 and Comparative Example r4.

[0120] The fabric samples obtained here were used as standards for the sensory evaluation of color difference in Examples R3 and R4, and Comparative Example r4.

[0121] Example R3 (1) Preparation of ink An infrared absorbing red ink with a red ink content of 30% by weight (wet / wet) and a CsWO content of 0.15% by weight per ink solid content was prepared by adding 0.13 parts by weight of the CsWO dispersion (corresponding to 0.03 parts by weight of CsWO) to 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example r3. This was used for coating the fabric and evaluation.

[0122] Example R4 and Comparative Example R4 As the red base ink, 100 parts by weight of the red base ink prepared in the same manner as in Comparative Example R3 was used, and the amount of CsWO dispersion added to 100 parts by weight of the red base ink was as shown in Table 1. Except for this, an infrared absorbing red ink was prepared in the same manner as in Example R3, and was used to apply to fabric and evaluate.

[0123] The above results are shown in Table 2.

[0124] [Table 1]

[0125] [Table 2]

[0126] Comparative Example y1, Examples Y1 and Y2, Comparative Examples y2 and y3, Examples Y3 and Y4, and Comparative Example y4 Except for using the same amount of yellow ink instead of the red ink, yellow base inks (Comparative Examples y1 and y3) and infrared absorbing yellow inks (Examples Y1 to Y4, and Comparative Examples y2 and y4) were prepared in the same manner as Comparative Example r1, Examples R1 and R2, Comparative Examples r2 and r3, Examples R3 and R4, and Comparative Example r4, and were used to apply to fabric and evaluate.

[0127] The photothermal properties of the fabric sample obtained in Comparative Example y1, and L * , a * , and b * The value was used as a standard for calculating the photothermal effect and color difference ΔE of the infrared absorbing pigment in Examples Y1 and Y2, and Comparative Example y2. The textile sample obtained in Comparative Example y1 was used as a standard for the sensory evaluation of color difference in Examples Y1 and Y2, and Comparative Example y2.

[0128] The photothermal properties of the fabric sample obtained in Comparative Example y3, as well as L * , a * , and b *The value was used as a standard for calculating the photothermal effect and color difference ΔE of the infrared absorbing pigment in Examples Y3 and Y4, and Comparative Example y4. The textile sample obtained in Comparative Example y3 was used as a standard for the sensory evaluation of color difference in Examples Y3 and Y4, and Comparative Example y4.

[0129] The ink compositions of the above examples and comparative examples are shown in Table 3. The photothermal effect and color tone (L * , a * , and b * The evaluation results of the color difference ΔE are shown in Table 4.

[0130] [Table 3]

[0131] [Table 4]

[0132] Comparative Example b1 and Examples B1 to B4 A blue base ink (Comparative Example b1) and infrared absorbing blue inks (Examples B1 to B4) were prepared in the same manner as in Comparative Example r1, Examples R1 and R2, and Comparative Example r2, except that the same amount of blue ink was used instead of the red ink, and these were used to apply to fabric and evaluate.

[0133] The photothermal properties of the fabric sample obtained in Comparative Example b1 and L * , a * , and b * The value was used as a standard for calculating the photoheating effect of the infrared absorbing pigment and the color difference ΔE in Examples B1 to B4. The woven fabric sample obtained in Comparative Example b1 was used as a standard for the sensory evaluation of the color difference in Examples B1 to B4.

[0134] The ink compositions of the above examples and comparative examples are shown in Table 5. The photothermal effect and color tone (L * , a * , and b* The evaluation results of the color difference ΔE are shown in Table 6.

[0135] [Table 5]

[0136] [Table 6]

[0137] Example R5 An infrared absorbing red ink with a red ink content of 10% by weight (wet / wet) and an ATO content of 1.19% by weight per ink solid content was prepared by adding 0.24 parts by weight of antimony-doped tin oxide (manufactured by Ishihara Sangyo Kaisha, Ltd., solid content 100% by weight) as an infrared absorbing pigment to 100 parts by weight of a red base ink prepared in the same manner as in Comparative Example R1. Except for using this, coating on a fabric and evaluation were performed in the same manner as in Example R1.

[0138] Comparative Example r5 An infrared absorbing red ink with a red ink content of 10% by weight (wet / wet) and a CB content of 0.15% by weight per ink solid content was prepared by adding 0.03 parts by weight of carbon black (CB) (furnace black "R400R" manufactured by CABOT, solid content 100% by weight) as an infrared absorbing pigment to 100 parts by weight of a red base ink prepared in the same manner as in Comparative Example R1. Except for using this, coating on a fabric and evaluation were performed in the same manner as in Example R1.

[0139] In the evaluation of these Examples and Comparative Examples, the fabric sample obtained in Comparative Example r1 was used as the standard fabric sample for the photoheat generation, color difference ΔE, and sensory evaluation.

[0140] The ink formulations of the above examples and comparative examples are shown in Table 7, along with the formulation of Comparative Example r1. In addition, the photothermal effect and color tone (L * , a * , and b *The evaluation results of the color difference ΔE are shown in Table 8 together with the evaluation results of Comparative Example r1.

[0141] [Table 7]

[0142] [Table 8]

[0143] Comparative Examples p1 to p3 and Examples P1 to P3 Except for changing the amounts of each color ink, urethane resin solution, MEK, and CsWO dispersion used as shown in Table 9, the respective color base inks (Comparative Examples p1 to p3) and the respective infrared absorbing color inks (Examples P1 to P3) were prepared in the same manner as in Comparative Example r1 and Example R1, and then used to apply to fabric and perform evaluation.

[0144] In these evaluations, the fabric samples used as the reference for the photoheat generation, color difference ΔE, and sensory evaluation were the sample of Comparative Example p1 for the sample of Example P1, the sample of Comparative Example p2 for the sample of Example P2, and the sample of Comparative Example p3 for the sample of Example P3. The results are shown in Table 10.

[0145] [Table 9]

[0146] [Table 10]

[0147] 2. Infrared absorbing fiber In the following examples and comparative examples, tests were carried out on tricots or woven fabrics made using infrared absorbing fibers containing infrared absorbing pigments. Cesium tungsten oxide (CsWO) was used as the infrared absorbing pigment, and the content in the fiber was set to two levels, 0.11% by weight and 0.52% by weight, to prepare polyethylene terephthalate (PET)-based infrared absorbing fibers and carry out the tests.

[0148] In the following Examples and Comparative Examples, the following raw materials were used for sample preparation.

[0149] Infrared absorbing pigments (Cesium Tungsten Oxide) Sumitomo Metal Mining Co., Ltd., "YMDS-874", Cs 0.33 Dispersion powder containing 3% by weight of WO32 and a dispersant

[0150] Hereinafter, the above infrared absorbing pigment Cs 0.33 WO3 is referred to as "CsWO", and a dispersion containing said CsWO and a dispersant is referred to as "CsWO dispersion".

[0151] <Base resin> Bell Polyester Products Co., Ltd., "Bellpet IP121B", copolymer type polyethylene terephthalate containing isophthalic acid as the third component, intrinsic viscosity = 0.62

[0152] Preparation of CsWO masterbatch 95 parts by weight of the base resin and 5 parts by weight of the CsWO dispersion powder (corresponding to 1.15 parts by weight of CsWO) were kneaded in a twin-screw extruder to obtain a CsWO master batch containing 1.15% by weight of CsWO.

[0153] Comparative Example t1 (1) Spinning Using a multifilament melt spinning apparatus, homo-PET was used as the spinning material and spun for 1 hour under conditions of a spinning temperature of 290°C, an extrusion rate of 4 kg / h, and a take-up speed of 1,500 m / min to obtain a 50 denier 24 filament multifilament fiber.

[0154] (2) Fabric preparation Using 80% by weight of the above multifilament fiber and 20% by weight of polyurethane fiber, a knitted fabric was knitted on a knitting machine with a gauge of 32 and a basis weight of 240 g / m 2 A tricot fabric was produced.

[0155] (3) Evaluation (3-1) Evaluation of photothermal activity Iwasaki Electric Co., Ltd.'s lighting eye lamp (model name "PRF250", rated voltage 100V, rated power consumption 250W, color temperature 3,200K, diffused light type) was placed 30cm away from a tricot fabric sample cut into a 7cm x 7cm square, and light was irradiated. The tricot fabric surface temperatures were measured before (0 minutes) and 5 minutes after light irradiation, and the photoheat generation of the tricot fabric sample was calculated from the difference between the two.

[0156] The photothermal properties of the tricot fabric samples obtained here were used as a standard for calculating the photothermal effect of the infrared absorbing pigments in Example T1 and Comparative Example T2.

[0157] (3-2) Color Tone Evaluation Using a spectrophotometer manufactured by X-Rite, model name "Spectroeye", the tricot fabric sample obtained above was measured in the L range in the CIE1976 color space. * , a * , and b * The measurement was performed on a white paper (L * = 94.84, a * = 0.03, b * The test was performed with three layers of 0.44 mm thick (thickness 0.24 mm) placed underneath the tricot fabric sample.

[0158] The L of the tricot fabric sample obtained here * , a * , and b * The value was used as a standard for calculating the color difference ΔE in Example T1 and Comparative Example T2.

[0159] Example T1 (1) Spinning An infrared absorbing multifilament fiber containing 0.11 wt % CsWO was obtained in the same manner as in Comparative Example t1, except that 9.57 parts by weight of CsWO master batch and 90.43 parts by weight of homo-PET were used as spinning raw materials.

[0160] (2) Fabric preparation An infrared absorbing tricot fabric was produced in the same manner as in Comparative Example t1, except that 80% by weight of the infrared absorbing multifilament fiber and 20% by weight of polyurethane fiber were used. The CsWO content of this infrared absorbing tricot fabric was 0.19 g / m 2 It was.

[0161] (3) Evaluation The obtained infrared absorbing tricot fabric was evaluated in the same manner as in Comparative Example t1.

[0162] Comparative Example t2 As spinning raw materials, 45.25 parts by weight of CsWO master batch and 54.75 parts by weight of homo PET were used, and an infrared absorbing multifilament fiber containing 0.52% by weight of CsWO was obtained in the same manner as in Comparative Example t1. Using the obtained infrared absorbing multifilament fiber, an infrared absorbing tricot fabric was produced and evaluated in the same manner as in Example T1.

[0163] The photothermal effect and color tone (L * , a * , and b * The evaluation results of the color difference ΔE are shown in Table 11.

[0164] [Table 11]

[0165] Comparative Example c1 (1) Spinning Using a multifilament melt spinning apparatus, homo PET was used as the spinning material, and spinning was performed for 1 hour under the conditions of a spinning temperature of 290°C, an extrusion rate of 4 kg / h, and a take-up speed of 1,500 m / min to obtain a 75 denier 24 filament multifilament fiber. Two of these multifilament fibers were twisted together to obtain a two-ply yarn equivalent to 150 denier.

[0166] (2) Fabric production The obtained two-ply yarn was used as the weft, and a polyester / wool blended yarn (250 denier) with a weight ratio of 50:50 was used as the warp. The usage ratio of the weft to the warp was 41:59 by weight, and the fabric was woven in a 3 / 1 twill pattern using a John Hell type loom to produce a fabric with a basis weight of 170 g / m 2 The fabric obtained was 100%.

[0167] (3) Evaluation The fabric obtained here is a 3 / 1 twill weave, so the warp side, where the polyester / wool blended warp yarns are mostly exposed, and the weft side, where the two-ply weft yarns are mostly exposed, form the front and back of the fabric. Therefore, the heat generation properties and color tone of the fabric samples were evaluated on both the warp side and the weft side, respectively.

[0168] (3-1) Evaluation of photothermal activity An Iwasaki Electric Co., Ltd. eye lamp (model name "PRF250", rated voltage 100V, rated power consumption 250W, color temperature 3,200K, diffused light type) was placed 30cm away from the fabric sample cut into a 7cm x 7cm square, and light was irradiated. The fabric backside temperature was measured before (0 minutes) and 5 minutes after light irradiation, and the photoheat generation of the fabric sample was calculated from the difference between the two.

[0169] The photoheating properties of the fabric samples obtained here were used as the basis for calculating the photoheating effect of the infrared absorbing fabrics in Example C1 and Comparative Example c2 for the warp and weft faces, respectively.

[0170] (3-2) Color Tone Evaluation Using a spectrophotometer manufactured by X-Rite, model name "Spectroeye", the L in the CIE1976 color space was measured for the textile samples obtained above. * , a * , and b * The measurement was performed on a white paper (L * = 94.84, a * = 0.03, b * The test was performed with three layers of 0.44 mm square (0.24 mm thick) placed underneath the fabric sample.

[0171] The L of the fabric sample obtained here * , a * , and b * The values ​​were used as the basis for calculating the color difference ΔE in Example C1 and Comparative Example c2 for the warp face and the weft face, respectively.

[0172] Example C1 (1) Spinning A 75 denier 24 filament infrared absorbing multifilament fiber containing 0.11% by weight of CsWO was obtained in the same manner as in Comparative Example c1, except that 9.57 parts by weight of CsWO master batch and 90.43 parts by weight of homo-PET were used as spinning raw materials. Two of these infrared absorbing multifilament fibers were twisted together to obtain an infrared absorbing two-ply yarn equivalent to 150 denier.

[0173] (2) Fabric production As the weft yarn, the infrared absorbing two-ply yarn obtained above was used, and the same procedure as in Comparative Example c1 was repeated to obtain a fabric having a basis weight of 170 g / m. 2 The infrared absorbing fabric had a CsWO content of 0.08 g / m 2 It was.

[0174] (3) Evaluation The obtained infrared absorbing fabric was evaluated in the same manner as in Comparative Example c1.

[0175] Comparative Example c2 An infrared absorbing multifilament fiber containing 0.52% by weight of CsWO was obtained in the same manner as in Comparative Example c1, except that 45.25 parts by weight of CsWO master batch and 54.75 parts by weight of homo-PET were used as spinning raw materials. An infrared absorbing two-ply yarn was produced in the same manner as in Example C1, except that the obtained infrared absorbing multifilament fiber was used, and the yarn was used to produce an infrared absorbing two-ply yarn having a basis weight of 170 g / m 2 The infrared absorbing fabric had a CsWO content of 0.35 g / m 2 It was.

[0176] This infrared absorbing fabric was evaluated in the same manner as in Comparative Example c1.

[0177] The photothermal effect and color tone (L * , a * , and b * The evaluation results of the color difference ΔE are shown in Table 12.

[0178] [Table 12]

Claims

1. An infrared absorbing textile or nonwoven fabric containing an infrared absorbing pigment, The infrared absorbing pigment is General M ｘ W ｙ O ｚ (1) In the formula (1), M is one or more elements selected from the group consisting of H, He, an alkali metal element, an alkaline earth metal element, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; x, y, and z are each a positive number, 0<x / y≦1, and 2.2≦z / y≦3.

0. A composite tungsten oxide represented by the formula: General formula W ｙ O ｚ (2) {In formula (2), W is tungsten, O is oxygen, y and z are each a positive number, and 2.45≦z / y≦2.999.} Tungsten oxide having a Magneli phase represented by comprising one or more selected from the group consisting of The content of the infrared absorbing pigment is 0.05 g / m per area of ​​the infrared absorbing woven or nonwoven fabric. ２ 0.5g / m or more ２ is as follows: L in CIE 1976 color space ＊ is 30 or more, and The color difference ΔE in CIE 1976 color space between the infrared absorbing knitted fabric or nonwoven fabric and a case in which the infrared absorbing knitted fabric or nonwoven fabric does not contain the infrared absorbing pigment is 10 or less. Infrared absorbing woven or nonwoven fabric.

2. The content of the infrared absorbing pigment is 0.05 g / m per area of ​​the infrared absorbing woven or nonwoven fabric. ２ 0.21g / m or more ２ The infrared absorbing knitted or nonwoven fabric according to claim 1, wherein:

3. The L in the CIE 1976 color space ＊ The infrared absorbing knitted or nonwoven fabric according to claim 1 or 2, wherein the infrared absorbing knitted or nonwoven fabric has a refractive index of more than 90 and satisfies at least one of the following (i) to (iv): (i) a in the CIE 1976 color space ＊ is less than or equal to -10; (ii) a in the CIE 1976 color space ＊ is 10 or more, (iii) b in CIE 1976 color space ＊ is less than or equal to -10; and (iv) b in CIE 1976 color space ＊ is 10 or more.

4. The L in the CIE 1976 color space ＊ 3. The infrared absorbing knitted or woven fabric according to claim 1 or 2, wherein the elastic modulus is 90 or less.

5. The infrared absorbing knitted or nonwoven fabric according to any one of claims 1 to 4, which is composed of infrared absorbing fibers containing the infrared absorbing pigment.

6. The infrared absorbing fiber includes the infrared absorbing pigment, and the fiber does not include the infrared absorbing pigment, The fiber not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing fiber. The infrared absorbing woven or nonwoven fabric according to any one of claims 1 to 4.

7. The infrared absorbing knitted or nonwoven fabric according to any one of claims 1 to 6, which is for use in cold weather clothing.

8. An infrared absorbing garment comprising the infrared absorbing knitted or woven fabric or nonwoven fabric according to any one of claims 5 to 7.

9. The present invention is composed of the infrared absorbing woven fabric or nonwoven fabric according to any one of claims 5 to 7, and a woven fabric or nonwoven fabric that does not contain an infrared absorbing pigment, The textile or nonwoven fabric not containing the infrared absorbing pigment has a configuration in which the infrared absorbing pigment is removed from the infrared absorbing textile or nonwoven fabric. Infrared absorbing clothing.

10. 10. The infrared absorbing garment according to claim 8 or 9, which is a cold weather garment.

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