Bayer Materialscience Ag

Lanxess Deutschland Gmbh

Andreas Frankenau

Wolfgang Ebert

Alexander Meyer

Wilfried Haese

Ulrich Liesenfelder

Hermann Kauth

Alfred Eitel

Bert Ruytinx

Uli Franz

Stefan Moss

Stefaan De Vos

Helmut Einberger

Ricarda Nothelle

Christian Eh

Haakan Jonsson

Stephen Böhmer

An improvement to the phase interface process of preparing aromatic polycarbonate is disclosed. The process is characterized in that the phosgenation is carried out at 0 to 40&#xb0; C., and in that the temperature of the reaction mixture at the time of addition of the catalyst at 10 to 40&#xb0; C., and in that the molar ratio of aromatic dihydroxy compounds to phosgene at 1:1.05 to 1:1.20. The polycarbonate thus produced is characterized in its low content of carbamates, making it particularly suitable for the preparation of optical storage media.

Process for the preparation of polycarbonates

A continuous process for the production of an elastomer-modified thermoplastic is disclosed. The process entails (i) obtaining graft elastomer (D) having residual moisture content of 1 to 50 wt. %, particularly 5 to 50 wt. %, particularly preferably 10 to 40 wt. %, (ii) introducing (D) and thermoplastic resin (B) through an inlet to a reactor operating under conditions calculated to melt (D) and (B) and to remove organic volatile components C) to produce a molten blend, the reactor being equipped with a plurality of kneading bars, that convey a portion of the molten blend towards the reactor inlet.

Process and device for the production of elastomer-modified thermoplastics

Growing community of inventors

Kempen, Germany

Andreas Frankenau