The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2026
Filed:
Feb. 08, 2022
Covestro Deutschland Ag, Leverkusen, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The present invention relates to a method for recovering raw materials (i.e. of polyols and optionally additionally amines) from polyurethane foams, comprising chemolysis. The chemolysis is characterised in that a polyurethane foam is reacted with an alcohol and water in the presence of a catalyst at a temperature of between 130° C. and 195° C., the mass ratio of (total) alcohol and (total) water to the polyurethane foam [i.e. m(alcohol+water)/m(polyurethane foam), where 'm'=mass] being between 0.5 and 2.5, and the mass of the water being between 4.0% and 10% of the mass of the alcohol. The catalyst comprises a metal salt selected from a carbonate, a hydrogen carbonate, an orthophosphate, a monohydrogen orthophosphate, a metaphosphate or a mixture of two or more of said metal salts.