PROCESS FOR PRODUCING EXTRUDED POLYSTYRENE FOAM PRODUCTS WITH CO2 CONTAINING BLOWING AGENTS

PROCESS FOR PRODUCING EXTRUDED POLYSTYRENE FOAM PRODUCTS WITH CO2 CONTAINING BLOWING AGENTS

In one embodiment, the present invention relates to a process for preparing foam board or sheet including the steps of (a) forming a foamable mixture of (1) a major amount of a styrenic polymer having a high melt index, (2) a minor amount of a low melt index styrenic polymer, and (3) a blowing agent...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: CISAR, THOMAS E, MILLER, LARRY M, BREINDEL, RAYMOND M, WEEKLEY, MITCHELL Z
Format: Patent
Sprache:eng ; fre
Schlagworte:
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
GENERAL PROCESSES OF COMPOUNDING
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
WORKING-UP
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Beschreibung
Zusammenfassung:In one embodiment, the present invention relates to a process for preparing foam board or sheet including the steps of (a) forming a foamable mixture of (1) a major amount of a styrenic polymer having a high melt index, (2) a minor amount of a low melt index styrenic polymer, and (3) a blowing agent containing a major amount of carbon dioxide under a pressure sufficient to prevent prefoaming of the mixture, and (b) foaming the mixture into a region of reduced pressure to fo rm a foam product.