PROCESS FOR FRACTIONATION/CONCENTRATION TO REDUCE THE POLYDISPERSIVITY OF POLYMERS

Methods of reducing the amount of undesirable by-products in the production of polymers are disclosed. The resulting polyetherimides have lower polydispersivity and enhanced thermomechanical properties. In some embodiments, cyclic and low molecular weight linear oligomers are also obtained. L'i...

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Bibliographische Detailangaben
Hauptverfasser:	HOWSON, PAUL, EDWARD, KHOURI, FARID, FOUAD
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G 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 THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	Methods of reducing the amount of undesirable by-products in the production of polymers are disclosed. The resulting polyetherimides have lower polydispersivity and enhanced thermomechanical properties. In some embodiments, cyclic and low molecular weight linear oligomers are also obtained. L'invention concerne des procédés de réduction de la quantité de sous-produits dans la production de polymères. Les polyétherimides obtenues présentent une polydispersivité inférieure et des propriétés thermomécaniques améliorées. Dans certains modes de réalisation, des oligomères linéaires cycliques et à masse moléculaires faible sont également obtenus.