Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same
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 relate...
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| creator | Ruytinx, Bert Vaes, Ing. Johan Kirchhoff, Joerg Bruynseels, Frank Vanden Eynde, Johan Bierdel, Michael Koenig, Thomas Rechner, Johann Kohlgrueber, Klemens |
| description | 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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Johan</au><au>Kirchhoff, Joerg</au><au>Bruynseels, Frank</au><au>Vanden Eynde, Johan</au><au>Bierdel, Michael</au><au>Koenig, Thomas</au><au>Rechner, Johann</au><au>Kohlgrueber, Klemens</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same</title><date>2019-10-08</date><risdate>2019</risdate><abstract>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.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS 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 |
| title | 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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