EXTRUDED FOAMS MADE WITH POLYLACTIDES THAT HAVE HIGH MOLECULAR WEIGHTS AND HIGH INTRINSIC VISCOSITIES

This invention provides an economical process for extruding a PLA resin into a low density foam with a high closed cell content. Excellent quality, low density foam is produced easily and reproducibly. The PLA resin in the foam has a weight average molecular weight of at least 500,000 and an intrins...

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Bibliographische Detailangaben
Hauptverfasser:	NANGERONI, JAMES, RANDALL, JED, RICHARD
Format:	Patent
Sprache:	eng ; fre
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 MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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 WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	This invention provides an economical process for extruding a PLA resin into a low density foam with a high closed cell content. Excellent quality, low density foam is produced easily and reproducibly. The PLA resin in the foam has a weight average molecular weight of at least 500,000 and an intrinsic viscosity of at least 1.4 deciliters/gram. Cette invention porte sur un procédé économique d'extrusion d'une résine de PLA en une mousse de faible densité avec une teneur en alvéoles fermées élevée. Une mousse de faible densité et d'excellente qualité est facilement produite et de façon reproductible. La résine de PLA dans la mousse a une masse moléculaire moyenne en poids d'au moins 500 000 et une viscosité intrinsèque d'au moins 1,4 décilitres/gramme.