	US 12,304,819 B2
	Low-CTE, low-puffing needle coke
Kyohei Hada, Tokyo (JP)
Assigned to NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo (JP)
Appl. No. 17/631,578
Filed by NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo (JP)
PCT Filed Sep. 2, 2020, PCT No. PCT/JP2020/033267 § 371(c)(1), (2) Date Jan. 31, 2022, PCT Pub. No. WO2021/054122, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-168292 (JP), filed on Sep. 17, 2019.
Prior Publication US 2022/0267151 A1, Aug. 25, 2022
Int. Cl. C01B 32/05 (2017.01); C10B 55/00 (2006.01); C10B 57/06 (2006.01)

CPC C01B 32/05 (2017.08) [C10B 55/00 (2013.01); C10B 57/06 (2013.01); C01P 2002/60 (2013.01); C01P 2002/90 (2013.01); C01P 2006/17 (2013.01); C01P 2006/90 (2013.01)]

6 Claims

1. Low CTE and low puffing needle coke, having a CTE-related structure index (NCSIC) expressed by equation (2) of more than 25.0, and a puffing-related structure index (NCSIP) expressed by equation (3) of more than 5.0:

NCSIC=((Lc/d002)+(open pore ratio))/(σ(θ)) [Equation (2)]

wherein Lc represents a crystallite size, d002 represents an interplanar spacing, and σ (θ) represents a standard deviation of average orientational angle;

NCSIP=(open pore amount/closed pore amount)+(HIT/1000)/EIT [Equation (3)]

wherein HIT represents an indentation hardness and EIT represents an indentation elastic modulus.