Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same

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United States of America Patent

PATENT NO 10435507
APP PUB NO 20180105644A1
SERIAL NO

15789704

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Abstract

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The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

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Patent Owner(s)

Patent OwnerAddress
COVESTRO DEUTSCHLAND AGLEVERKUSEN GERMANY LEVERKUSEN NORTH RHINE-WESTPHALIA

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bierdel, Michael Leverkusen, DE 29 120
Bruynseels, Frank Sint Gillis, BE 5 12
Kirchhoff, Joerg Cologne, DE 5 7
Koenig, Thomas Leverkusen, DE 36 119
Kohlgrueber, Klemens Kurten, DE 4 12
Rechner, Johann Kempen, DE 63 497
Ruytinx, Bert Halen, BE 8 37
Vaes, Ing Johan Kalmthout, BE 2 12
Vanden, Eynde Johan Zwijnaarde, BE 34 85

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