Polysiloxane-polycarbonate block cocondensates with improved rheological properties

US10035884B2 · 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
• Alexander Karbach · Krefeld, DE

Key dates

• Filing date: Jan 26, 2015
• Grant date: Jul 31, 2018
• Expiry date: Feb 13, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/186
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to polysiloxane-polycarbonate block cocondensates derived from a continuous melt transesterification process comprising polysiloxane blocks of the formula (1) and polycarbonate blocks having recurring units of the formula (2) having improved rheological properties and good mechanical properties as well as to mouldings and extrudates made from these polysiloxane-polycarbonate block cocondensates and wherein the polysiloxane-polycarbonate block cocondensate has a siloxane domain distribution (diameter of siloxane domains) from 200 nm to 1 μm measured by atomic force microscopy and light microscopy which is in the range of 0.01%-2.5%, based on the total number of siloxane domains.