METHOD OF FORMING THERMOPLASTIC FOAMS USING NANO-PARTICLES TO CONTROL CELL MORPHOLOGY

A process for making closed-cell, alkenyl aromatic polymer foams using nano- particle nucleation agents to control the cell morphology of the resulting foam includes forming a polymer melt at a temperature above the polymer glas s transition temperature (for crystal polymers) or the polymer melt poi...

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Bibliographische Detailangaben
Hauptverfasser:	BRIENDEL, RAYMOND M, RYND, JOSEPH P, LOH, ROLAND R
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MANUFACTURE OR TREATMENT OF NANOSTRUCTURES MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES METALLURGY NANOTECHNOLOGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	A process for making closed-cell, alkenyl aromatic polymer foams using nano- particle nucleation agents to control the cell morphology of the resulting foam includes forming a polymer melt at a temperature above the polymer glas s transition temperature (for crystal polymers) or the polymer melt point (for amorphous polymers); incorporating selected nano-particles into the polymer melt; incorporating blowing agents into the polymer melt at an elevated pressure; optionally incorporating other additives, such as flame retardants , into the polymer melt; and extruding the polymer melt under conditions sufficient to produce a foam product having a desired cell morphology, characterized by parameters such as reduced average cell size range and/or increased asymmetry of the cells.