Patent · US Active

Device and method for degassing solvent-containing polycarbonate solutions

US8383757B2 · kind B2 · utility

0Cited by

13References

14Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Thomas König · Nuremberg, DE
Klemens Kohlgrüber · Lingen (Ems), DE
René de Cleyn · Brasschaat, BE
Johan Vaes · Kalmthout, BE
Johan Vanden Eynde · Zwijnaarde, BE
Dirk Van Meirvenne · Bang Phra, TH

Key dates

Filing date	May 26, 2010
Grant date	Feb 26, 2013
Priority date	—
Expiry date	May 26, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2105/16
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention relates to an apparatus and a process for devolatilizing solvent-containing polycarbonate solutions. By employing the inventive apparatus, polycarbonates with low residual values of volatile constituents are produced from solvent-containing polymer melts, which improved optical properties, especially yellowness index, with the aid of an apparatus combination of a heatable tubular devolatilizer and a vented extruder.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.