MISCHVERFAHREN FUER HOCHVISKOSES SILICON

Blends of thermoplastic polymers (I) and silicone fluids (II) are produced continuously by melting one or more (I) in an extruder; injecting a high viscosity (at least 90,000 centipoise at ambient temp.) silicone fluid; and blending the mixt. during its passage through the extruder. The temp. of ble...

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Bibliographische Detailangaben
Hauptverfasser:	ALAN REED,RANDALL, CHESTER GOLBA JUN.,JOSEPH, MAGNUS LOVGREN,ERIC
Format:	Patent
Sprache:	ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS 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 WORKING-UP
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Beschreibung
Zusammenfassung:	Blends of thermoplastic polymers (I) and silicone fluids (II) are produced continuously by melting one or more (I) in an extruder; injecting a high viscosity (at least 90,000 centipoise at ambient temp.) silicone fluid; and blending the mixt. during its passage through the extruder. The temp. of blending is controlled to achieve the desired dispersion, pref. by controlling the temp. of the polymer melt prior to blending. Injection pref. occurs at a point 1/3 to 1/2 the extruder length downstream from the polymer feed point. Polymer blends having desirable engineering properties and improved lame retardancy (compared with materials produced by prior art processes) are obtd. by a simple and economical process providing a high degree of dispersion with minimal degradation.