US 11,898,276 B2
Carbon fiber and method of forming the same
Kun-Yeh Tsai, Kaohsiung (TW); Chia-Chi Hung, Kaohsiung (TW); Wen-Ju Chou, Kaohsiung (TW); Ching-Wen Chen, Kaohsiung (TW); Chia-Chun Hsieh, Kaohsiung (TW); Shi-Jie Lin, Kaohsiung (TW); and Long-Tyan Hwang, Kaohsiung (TW)
Assigned to FORMOSA PLASTICS CORPORATION, Kaohsiung (TW)
Filed by FORMOSA PLASTICS CORPORATION, Kaohsiung (TW)
Filed on May 27, 2022, as Appl. No. 17/827,565.
Claims priority of application No. 110119319 (TW), filed on May 27, 2021.
Prior Publication US 2022/0389624 A1, Dec. 8, 2022
Int. Cl. D01D 5/12 (2006.01); D01D 5/14 (2006.01); D01D 10/02 (2006.01); D02J 1/22 (2006.01); D02J 13/00 (2006.01); D06B 1/00 (2006.01); D06B 3/04 (2006.01); D06M 15/643 (2006.01); D06M 15/70 (2006.01); D01F 9/22 (2006.01); D01D 5/06 (2006.01); D06M 101/28 (2006.01)
CPC D01F 9/22 (2013.01) [D01D 5/06 (2013.01); D02J 1/223 (2013.01); D02J 1/228 (2013.01); D02J 13/005 (2013.01); D06M 15/6436 (2013.01); D06M 2101/28 (2013.01); D06M 2200/40 (2013.01); D10B 2101/12 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of forming a carbon fiber, comprising:
dissolving a polyacrylonitrile copolymer in a solvent to obtain a dope;
performing a spinning process to the dope, thereby obtaining a filament tow;
oiling the filament tow to obtain a filament with oil by using a finishing oil, wherein a surface tension (σ) is in a range of 30 mN/m to 70 mN/m, and the surface tension and a particle size (R) of the finishing oil satisfy following equation:
20<σ+(R/2)0.5<60;
performing a compacting drying process to the filament with oil, thereby obtaining a filament; and
performing a firing process to the filament, thereby obtaining the carbon fiber.