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:
Aug. 22, 2023
Filed:
Sep. 15, 2021
Applicant:
Evonik Operations Gmbh, Essen, DE;
Inventors:
Assignee:
Evonik Operations GmbH, Essen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 77/46 (2006.01); C08J 11/26 (2006.01); C08J 11/12 (2006.01); C08G 77/14 (2006.01);
U.S. Cl.
CPC ...
C08G 77/46 (2013.01); C08G 77/14 (2013.01); C08J 11/12 (2013.01); C08J 11/26 (2013.01); C08J 2383/04 (2013.01); C08J 2383/06 (2013.01);
Abstract
Upcycling process for producing acidic, end-equilibrated siloxanes bearing acetoxy groups and having chain lengths of greater than 3 silicon atoms from end-of-life silicones by thermal digestion in an acidic reaction medium comprising acetic anhydride, acetic acid and at least one further Brønsted acid having a pKa of <4, the digestion taking place in a reactor having a volume of at least 1 liter.