	US 12,351,679 B2
	Crystalline polyester resin and manufacturing method thereof
Da-Young Hwang, Gyeonggi-do (KR); Hyun-Woo Oh, Gyeonggi-do (KR); and Yoo Jin Lee, Gyeonggi-do (KR)
Assigned to SK CHEMICALS CO., LTD., Gyeonggi-do (KR)
Appl. No. 18/870,637
Filed by SK CHEMICALS CO., LTD., Gyeonggi-do (KR)
PCT Filed Jul. 16, 2024, PCT No. PCT/KR2024/010194 § 371(c)(1), (2) Date Nov. 29, 2024, PCT Pub. No. WO2025/028855, PCT Pub. Date Feb. 6, 2025.
Claims priority of application No. 10-2023-0099519 (KR), filed on Jul. 31, 2023.
Prior Publication US 2025/0171588 A1, May 29, 2025
Int. Cl. C08G 63/672 (2006.01); C08G 63/90 (2006.01)

CPC C08G 63/672 (2013.01) [C08G 63/90 (2013.01)]

20 Claims

1. A crystalline polyester resin, which comprises a diol repeat unit derived from a diol component; and a dicarboxylic acid repeat unit derived from a dicarboxylic acid component, wherein, when the crystalline polyester resin is analyzed by differential scanning calorimetry (DSC) while the temperature is raised to 280° C. at a scan rate of 10° C./minute, two or more melting temperatures (T_m) appear, and the following Relationship 1 is satisfied:

4<X/Y<70 [Relationship 1]

in Relationship 1, X is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at 200° C. or higher, and Y is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at lower than 200° C.