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. 14, 2026
Filed:
Mar. 30, 2020
Covestro Intellectual Property Gmbh & Co. KG, Leverkusen, DE;
Rolf Bachmann, Bergisch Gladbach, DE;
Antonio Ortiz, Duisburg, DE;
Josef Bartholomei, Brüggen, DE;
Marten Voelker, Neuss, DE;
Jan Heijl, Lokeren, BE;
Covestro Intellectual Property GmbH & Co. KG, Leverkusen, DE;
Abstract
The present invention relates to a process for producing polycarbonate according to a phase boundary process, from at least one dihydroxydiaryl alkane, phosgene, at least one catalyst and at least one chain terminator, the process producing polycarbonate with a low proportion of oligomers and a low proportion of Di-chain terminator carbonate. The process according to the invention is characterized in that the chain terminator is added to the reaction system at a designated time.