	US 12,247,102 B2
	Process for the preparation of polyamides
Bryan D. Kaushiva, Yorkshire (GB)
Assigned to INV NYLON POLYMERS AMERICAS, LLC
Appl. No. 17/430,459
Filed by INV NYLON POLYMERS AMERICAS, LLC, Wilmington, DE (US)
PCT Filed Feb. 20, 2020, PCT No. PCT/IB2020/051411 § 371(c)(1), (2) Date Aug. 12, 2021, PCT Pub. No. WO2020/170179, PCT Pub. Date Aug. 27, 2020.
Claims priority of provisional application 62/808,320, filed on Feb. 21, 2019.
Prior Publication US 2022/0185961 A1, Jun. 16, 2022
Int. Cl. C08G 69/28 (2006.01); C08G 69/30 (2006.01); C08L 77/06 (2006.01)

CPC C08G 69/28 (2013.01) [C08G 69/30 (2013.01); C08L 77/06 (2013.01); C08J 2377/06 (2013.01)]

13 Claims

1. A process for making at least one of a polyamide or a polyamide salt comprising:

feeding a finely divided solid diacid comprising adipic acid at a temperature below 100° C. to a cascade reactor unit comprising a reaction zone that comprises a plurality of vertically-stacked fluidized bed sections;

fluidizing the finely divided solid diacid in a fluidizing gas; and

reacting the finely divided solid diacid with diamine comprising hexamethylenediamine in the reaction zone to form at least one of the polyamide comprising nylon-6,6 or the polyamide salt comprising a nylon-6,6 salt.