	US 12,275,819 B2
	Process for the decomposition of polyether-polyurethane
Lukas Reisky, Cologne (DE); and Gernot Jaeger, Cologne (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 17/619,100
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Aug. 10, 2020, PCT No. PCT/EP2020/072333 § 371(c)(1), (2) Date Dec. 14, 2021, PCT Pub. No. WO2021/032513, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 19192115 (EP), filed on Aug. 16, 2019.
Prior Publication US 2022/0259380 A1, Aug. 18, 2022
Int. Cl. C08G 71/04 (2006.01); C12N 9/80 (2006.01); C12P 13/02 (2006.01)

CPC C08G 71/04 (2013.01) [C12N 9/80 (2013.01); C12P 13/02 (2013.01); C12Y 305/01075 (2013.01)]

16 Claims

1. A process comprising the steps of

a) transurethanizing a polyether polyurethane with at least one low-molecular-weight alcohol having at least 2 hydroxyl groups per molecule and a molecular weight of not more than 500 g/mol, to form polyether polyols and low-molecular-weight urethanes; and

b) enzymatically cleaving the low-molecular-weight urethanes formed in process step a), with liberation of at least one amine and the at least one low-molecular-weight alcohol used in process step a).