Patent Number: 6,252,035

Title: Salts of chelating agents as polymerization catalysts

Abstract: The present invention relates to a method for the preparation of polycarbonate comprising preparing a polycarbonate by a melt process by reacting a diphenol and a diaryl carbonate in the presence of a catalytically effective amount of one or more alkali and or alkali earth metal salts of chelating agents. Suitable chelating agents include nitrilotriacetate and EDTA.

Inventors: McCloskey; Patrick Joseph (Watervliet, NY), Burnell; Timothy Brydon (Niskayuna, NY), Smigelski, Jr.; Paul Michael (Schenectady, NY)

Assignee: General Electric Company

International Classification: C08G 64/30 (20060101); C08G 64/00 (20060101); C08G 064/00 ()

Expiration Date: 06/26/2018