METHOD AND APPARATUS FOR PRODUCING THERMOPLASTIC FOAM

Thermoplastic foam is prepared by a continuous process comprising melt mixing thermoplastic resin; pressurizing the resin melt; introducing blowing agent; cooling and depressurizing the resultant gel; and either foaming and forming the gel to form a solid foam or forming the gel to form a foamable c...

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Bibliographische Detailangaben
Hauptverfasser:	HARFMANN,WALTER R.,US, KORB,JEAN C.,FR
Format:	Patent
Sprache:	eng
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:	Thermoplastic foam is prepared by a continuous process comprising melt mixing thermoplastic resin; pressurizing the resin melt; introducing blowing agent; cooling and depressurizing the resultant gel; and either foaming and forming the gel to form a solid foam or forming the gel to form a foamable composition. The process temperature is maintained substantially independently of the flow rate of the resin melt and gel at below that at which substantial degredation of the resin gel occurs. The process has particular application to rubber-modified polystyrene or rubber-modified polyethylene resin foam compositions containing a fire retardant.