US 12,258,714 B2
Aramid pulp and method for manufacturing the same
Changhee Ko, Seoul (KR); and Namdae Gu, Seoul (KR)
Assigned to KOLON INDUSTRIES, INC., Seoul (KR)
Appl. No. 17/775,899
Filed by KOLON INDUSTRIES, INC., Seoul (KR)
PCT Filed Dec. 24, 2020, PCT No. PCT/KR2020/019048
§ 371(c)(1), (2) Date May 11, 2022,
PCT Pub. No. WO2021/137524, PCT Pub. Date Jul. 8, 2021.
Claims priority of application No. 10-2019-0179689 (KR), filed on Dec. 31, 2019; and application No. 10-2020-0174805 (KR), filed on Dec. 14, 2020.
Prior Publication US 2022/0389660 A1, Dec. 8, 2022
Int. Cl. D21H 13/26 (2006.01); D21C 3/26 (2006.01); D21D 1/20 (2006.01); D21H 17/55 (2006.01)
CPC D21H 13/26 (2013.01) [D21C 3/26 (2013.01); D21D 1/20 (2013.01); D21H 17/55 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for manufacturing an aramid pulp, the method comprising the steps of:
providing an oilless aramid short fiber;
preparing a water dispersion slurry of the oilless aramid short fiber; and
refining the water dispersion slurry,
wherein the oilless aramid short fiber is produced by a method which comprises spinning and coagulating a spinning dope using an aromatic polyamide polymer to produce a multifilament, and
drying and cutting the multifilament, so that the fiber does not contain a spinning oil agent and water,
wherein the step of preparing the water dispersion slurry comprises a step of dissociating the oilless aramid short fiber in water for 10 minutes or more and 120 minutes or less at room temperature to swell the oilless aramid short fiber.