Two-step process for the production of thermoplastic polycarbonate

US5767224A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Steffen Kuhling · Meerbusch, DE
• Klaus Schebesta · Leverkusen, DE
• Uwe Hucks · Alpen, DE
• Martin Ullrich · Leverkusen, DE
• Heinrich Schuchardt · Leverkusen, DE
• Rolf Bachmann · Busswil, CH
• Thomas Fischer · Graz, AT
• Klemens Kohlgrüber · Lingen (Ems), DE
• Franz Ferdinand Rhiel · Dormagen, DE
• Gottfried Zaby · Leverkusen, DE

Key dates

• Filing date: Mar 24, 1997
• Grant date: Jun 16, 1998
• Expiry date: Mar 24, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/307
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a two-step melt process for the production of thermoplastic, solvent-free, low-branching polycarbonates with low --OH terminal group content using a self-cleaning high-viscosity reactor.