Process for treatment of metal surfaces

US7901467B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Wolfgang Ebert · Krefeld, DE
• Rainer Mellis · Aachen, DE
• Alexander Meyer · Mülheim an der Ruhr, DE
• Bert Ruytinx · Halen, BE
• Alexander Karbach · Krefeld, DE
• Delef Michalski-Vollmer · Leverkusen, DE

Key dates

• Filing date: Oct 25, 2007
• Grant date: Mar 8, 2011
• Expiry date: Dec 26, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2069/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for treating the working surfaces of equipment used in the production and processing of polycarbonate is disclosed. The thermal treatment in an oxidative atmosphere results in resin and molded articles having improved optical quality.