Preparation of siloxane-containing block copolycarbonates by means of reactive extrusion

US9828462B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Alexander Meyer · Mülheim an der Ruhr, DE
• Klaus Horn · Dortmund, DE
• Reiner Rudolf · Leverkusen, DE
• Ulrich Liesenfelder · Bensberg, DE
• Thomas König · Nuremberg, DE

Key dates

• Filing date: Oct 6, 2014
• Grant date: Nov 28, 2017
• Expiry date: Oct 6, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/448
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing polysiloxane-polycarbonate block cocondensates proceeding from specific polycarbonates and hydroxyaryl-terminated polysiloxanes. More particularly, the present invention relates to the preparation of the said block cocondensates by means of a reactive extrusion.