ULTRA-HIGH PURITY POLYCARBONATES HAVING GOOD INHERENT COLOR AND THERMAL RESISTANCE AND A DEVICE AND A METHOD FOR PRODUCING THE SAME

• Main Authors: KIRCHHOFF JOERG, KOHLGRUEBER KLEMENS, RECHNER JOHANN, VAES JOHAN, RUYTINX BERT, VANDEN EYNDE JOHAN, KOENIG THOMAS, BIERDEL MICHAEL, BRUYNSEELS FRANK
• Format: Patent
• Language: English; Korean
• Published: 14.03.2012
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Aromatic polycarbonate, comprising less than 5 ppm of aromatic chloro compounds, less than 0.5 ppm of dichloromethane, less than 5 ppm of univalent phenol and less than 0.5 ppm of aromatic compound, which is free of chlorine, is new. Independent claims are included for: (1) a device, for degassing of solvent-based polycarbonate melt, comprising a degassing extruder with at least three degassing zones, and a zone, before the degassing zones, for dispersing a stripping agent; and (2) the preparation of the polycarbonate.