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:
Apr. 11, 2017
Filed:
Jul. 25, 2014
Sabic Global Technologies B.v., Bergen op Zoom, NL;
William E. Hollar, Jr., Mount Vernon, IN (US);
Zeljko Kuzeljevic, Evansville, IN (US);
Mohan Khadilkar, Mount Vernon, IN (US);
Donald Paciorkowski, New Harmony, IN (US);
SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom, NL;
Abstract
In an embodiment, a process of purifying a polycarbonate comprises: polymerizing a dihydroxy compound and a carbonate source via an interfacial reaction in the presence of a catalyst to form a product mixture comprising an aqueous phase and an organic phase, wherein the organic phase comprises the polycarbonate, the catalyst, ions, and a solvent having a boiling point T; heating the product mixture to greater than or equal to T; separating the aqueous phase and the organic phase at a temperature greater than or equal to Tto form a separated organic phase and a separated aqueous phase; extracting the catalyst from the separated organic phase; and extracting the ions from the separated organic phase; wherein if a centrifuge is used in the extracting of the catalyst, the extracting of the ions, or both, the process further comprises cooling a stream entering the centrifuge to less than T.