Infrared-absorbing fiber, knit fabric, or non-woven fabric

Abstract

Provided is an infrared-absorbing fiber, knit fabric, or non-woven fabric containing an infrared-absorbing pigment, wherein L* in the CIE 1976 color space is at least 30, and the color difference ΔE in the CIE 1976 color space between said infrared-absorbing fiber, knit fabric, or non-woven fabric and an infrared-absorbing fiber, knit fabric, or non-woven fabric containing no infrared-absorbing pigment is at most 10.

1 . An infrared absorbent fiber, knit/woven fabric, or nonwoven fabric comprising an infrared absorbing pigment,
 wherein L* in CIE 1976 color space is 30 or greater, and   a color difference ΔE in the CIE 1976 color space between the infrared absorbent fiber, knit/woven fabric, or nonwoven fabric and the infrared absorbent fiber, knit/woven fabric, or nonwoven fabric not comprising the infrared absorbing pigment is 10 or less.   
     
     
         2 . The infrared absorbent fiber, knit/woven fabric, or nonwoven fabric according to  claim 1 , wherein the L* in the CIE 1976 color space is greater than 90, and at least one of (i) to (iv) below is satisfied:
 (i) a* in the CIE 1976 color space is −10 or less,   (ii) a* in the CIE 1976 color space is 10 or greater,   (iii) b* in the CIE 1976 color space is −10 or less, and   (iv) b* in the CIE 1976 color space is 10 or greater.   
     
     
         3 . The infrared absorbent fiber, knit/woven fabric, or nonwoven fabric according to  claim 1 , wherein the L* in the CIE 1976 color space is 90 or less. 
     
     
         4 . The infrared absorbent fiber, knit/woven fabric, or nonwoven fabric according to  claim 1 ,
 wherein the infrared absorbent fiber has a content of the infrared absorbing pigment of 0.01% by mass or greater and 0.50% by mass or less based on a total mass of the infrared absorbent fiber for, and   the infrared absorbent knit/woven fabric or nonwoven fabric has a content of the infrared absorbing pigment of 0.05 g/m 2  or greater and 0.5 g/m 2  or less per area of the infrared absorbent knit/woven fabric or nonwoven fabric.   
     
     
         5 . The infrared absorbent fiber, knit/woven fabric, or nonwoven fabric according to  claim 1 ,
 wherein the infrared absorbing pigment comprises at least one or more selected from the group consisting of   a composite tungsten oxide, represented by
   general formula M x W y O z   (1)
 
   wherein M is one or more elements selected from the group consisting of H, He, alkali metals, alkaline earth metals, rare earth elements, 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, and   a tungsten oxide having a Magnéli phase, represented by
   general formula W y O z   (2)
 
   wherein W is tungsten; O is oxygen; y and z are each a positive number; and 2.45≤z/y≤2.999.   
     
     
         6 - 13 . (canceled) 
     
     
         14 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 1 . 
     
     
         15 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 2 . 
     
     
         16 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 3 . 
     
     
         17 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 1  and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber. 
 
     
     
         18 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 2  and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber. 
 
     
     
         19 . An infrared absorbent knit/woven fabric or nonwoven fabric, composed of the infrared absorbent fiber according to  claim 3  and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber. 
 
     
     
         20 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 1 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment. 
     
     
         21 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 2 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment. 
     
     
         22 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 3 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment. 
     
     
         23 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 1 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber.   
     
     
         24 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 2 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber.   
     
     
         25 . The infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 3 , composed of the infrared absorbent fiber comprising the infrared absorbing pigment and a fiber free of any infrared absorbing pigment,
 wherein the fiber free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent fiber.   
     
     
         26 . An infrared absorbent clothing, composed of the infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 1 . 
     
     
         27 . An infrared absorbent clothing, composed of the infrared absorbent knit/woven fabric or nonwoven fabric according to  claim 1  and a knit/woven fabric or nonwoven fabric free of any infrared absorbing pigment,
 wherein the knit/woven fabric or nonwoven fabric free of any infrared absorbing pigment is configured such that the infrared absorbing pigment is removed from the infrared absorbent knit/woven fabric or nonwoven fabric.