US 11,885,043 B2
Acrylic fiber for artificial hair, and head decoration product including same
Megumi Yoshikawa, Hyogo (JP); Takao Michinobu, Hyogo (JP); and Takeshi Tanaka, Hyogo (JP)
Assigned to KANEKA CORPORATION, Osaka (JP)
Filed by KANEKA CORPORATION, Osaka (JP)
Filed on Feb. 9, 2021, as Appl. No. 17/171,374.
Application 17/171,374 is a continuation of application No. PCT/JP2019/023108, filed on Jun. 11, 2019.
Claims priority of application No. 2018-156446 (JP), filed on Aug. 23, 2018.
Prior Publication US 2021/0164130 A1, Jun. 3, 2021
Int. Cl. D01D 5/253 (2006.01); D01F 6/38 (2006.01); A41G 3/00 (2006.01)
CPC D01D 5/253 (2013.01) [D01F 6/38 (2013.01); A41G 3/0083 (2013.01); D10B 2503/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An acrylic fiber for artificial hair comprising an acrylic copolymer,
wherein the acrylic fiber has a fiber cross section comprising 2 or more and 4 or less T-shaped protrusions that extend radially from a central portion, and each of the T-shaped protrusions has an arc-shaped upper side that bulges in a direction away from the central portion,
wherein a circumradius of the fiber cross section is 40.0 μm or more and 60.0 μm or less, a distance between adjacent end portions of corresponding upper sides of adjacent T-shaped protrusions is 3.0 μm or more and 60.0 μm or less, and an axial width is 10.0 μm or more, and a torsional rigidity of the acrylic fiber is 0.30 mg·cm2 or more and 2.0 mg·cm2 or less.