METHOD TO IMPROVE OPTICAL PROPERTIES OF STABILIZED POLYCARBONATE COMPOSITIONS

Methods for producing transparent polycarbonate articles include melting a composition at a temperature of 300 to 390° C., extruding the melted composition to form a strand, cooling the strand of extruded composition, cutting the cooled strand into pellets, drying the pellets at a temperature of 50...

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Bibliographische Detailangaben
Hauptverfasser:	Ehrensbeck, Franklin, Wassmer, Kevin, Gallucci, Robert Russell, Hollar, JR., William E
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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 USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Methods for producing transparent polycarbonate articles include melting a composition at a temperature of 300 to 390° C., extruding the melted composition to form a strand, cooling the strand of extruded composition, cutting the cooled strand into pellets, drying the pellets at a temperature of 50 to 140° C. and injecting molding or extruding the pellets at a temperature of 300 to 380° C. to form an article. The composition can comprise a moisture content of 0.1 to 5 wt. % and a crystalline additive having a melting point of at least 280° C., a heat of fusion greater than or equal to 1.0 Joule/gram (J/g). The composition can be cooled to at least 20° C. below the glass transition temperature of the polycarbonate.