	US 12,134,680 B2
	Method for crystallizing a polyester comprising at least one 1,4:3,6-dianhydrohexitol unit
Nicolas Jacquel, Pontarlier (FR); René Saint-Loup, Lomme (FR); Audrey Dausque, Houplines (FR); Sébastien Naudin, Coutances (FR); and Nicolas Descamps, Sainghin-en-Melantois (FR)
Assigned to Roquette Freres, Lestrem (FR)
Appl. No. 17/059,948
Filed by ROQUETTE FRERES, Lestrem (FR)
PCT Filed May 29, 2019, PCT No. PCT/FR2019/051282 § 371(c)(1), (2) Date Sep. 8, 2021, PCT Pub. No. WO2019/229394, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 18 54738 (FR), filed on May 31, 2018.
Prior Publication US 2022/0267514 A1, Aug. 25, 2022
Int. Cl. C08G 63/80 (2006.01); C08G 63/672 (2006.01)

CPC C08G 63/80 (2013.01) [C08G 63/672 (2013.01)]

10 Claims

1. A method for crystallizing a polyester comprising at least one 1,4:3,6-dianhydrohexitol unit, and comprising the following steps of:

providing a semi-crystalline polyester comprising at least one 1,4:3,6-dianhydrohexitol unit, and

crystallizing said polyester,

wherein the crystallization step is performed at a pressure at a range of from 600 to 800 mbar absolute and further comprises a step of drying the polyester upstream of the crystallization step so as to obtain a water content in the polyester of less than 0.1%.