US 12,031,241 B2
Core-sheath composite fiber for artificial hair, headdress product including same, and production method therefor
Genta Sakamoto, Osaka (JP); Norikazu Yasutomo, Osaka (JP); Hiroshi Fujinaga, Osaka (JP); and Takashi Ogino, Osaka (JP)
Assigned to KANEKA CORPORATION, Osaka (JP)
Filed by KANEKA CORPORATION, Osaka (JP)
Filed on Aug. 4, 2021, as Appl. No. 17/393,698.
Application 17/393,698 is a continuation of application No. PCT/JP2020/001147, filed on Jan. 16, 2020.
Claims priority of application No. 2019-025698 (JP), filed on Feb. 15, 2019.
Prior Publication US 2021/0363667 A1, Nov. 25, 2021
Int. Cl. D01F 8/14 (2006.01); A41G 3/00 (2006.01); D01D 5/10 (2006.01); D01F 1/04 (2006.01); D01F 8/12 (2006.01)
CPC D01F 8/14 (2013.01) [A41G 3/0083 (2013.01); D01D 5/10 (2013.01); D01F 1/04 (2013.01); D01F 8/12 (2013.01); D10B 2331/02 (2013.01); D10B 2331/04 (2013.01); D10B 2401/20 (2013.01); D10B 2503/08 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A core-sheath conjugate fiber for artificial hair comprising a core part and a sheath part,
wherein the core-sheath conjugate fiber for artificial hair is a colored fiber,
a color difference ΔE* between the core-sheath conjugate fiber for artificial hair and the core part is 10 or more, and a color difference ΔE* between the core-sheath conjugate fiber for artificial hair and the sheath part is 10 or more, and
the color difference ΔE* is calculated by the following Equation (1) using CIE1976 (L* a* b*) color space:
ΔE*=[(L*1−L*2)2+(a*1−a*2)2+(b*1−b*2)2]1/2  (1)
where L* represents lightness, a positive value of a* represents chromaticity toward red, a negative value of a* represents chromaticity toward green, a positive value of b* represents chromaticity toward yellow, a negative value of b* represents chromaticity toward blue, L*1, a*1, and b*1 are values for the core-sheath conjugate fiber for artificial hair and the core part, and L*2, a*2, and b*2 are values for the core-sheath conjugate fiber for artificial hair and the sheath part.