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US 12,275,819 B2Granted
Process for the decomposition of polyether-polyurethane
AssigneeCovestro Intellectual Property GmbH & Co. KG
InventorsLukas Reisky, Gernot Jaeger
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Abstract
A process is provided, by means of which polyurethanes, which have been formed from polyether polyols and aromatic isocyanates, can be decomposed to polyether polyols and aromatic amines.
Claims16
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).
Dependencies are inferred from the claim text.