Polyalkylene glycols comprising a reduced amount of oligomers

Details Polyalkylene glycols comprising a reduced amount of oligomers Polyalkylene glycols comprising a reduced amount of oligomers

C - Chemistry, Metallurgy

08

G

C08G 65/30 (2006.01)

Patent

CA 2637344

Polyalkylene glycol compositions having reduced low molecular weight oligomers are disclosed. Some compositions, particularly polyethylene glycol compositions have a number average molecular weight range from about 3000 to about 10,000 g/mol and have a total oligomer concentration of less than about 400 ppm of all oligomers having a molecular weight of less than or equal to 812 g/mol and a a total oligomer concentration of less than about 50 ppm of all oligomers having a molecular weight of less than or equal to 240 g/mol. Other polyalkylene compositions, particularly polyethylene glycol compositions, are characterized by a total oligomer concentration of less than about 90 ppm of all oligomers having a molecular weight less than or equal to 460 g/mol and are obtained without further processing to remove oligomers having a molecular weight of less than about 460 g/mol. Methods for making such compositions are also disclosed.

La présente invention concerne des préparations de polyalkylène glycols présentant une quantité réduite d'oligomères de masse moléculaire faible. Certaines préparations, en particulier les préparations de polyéthylène glycols, ont une masse moléculaire moyenne en nombre comprise entre environ 3000 et environ 10 000 g/mol, une concentration totale en oligomères inférieure à environ 400 ppm pour tous les oligomères de masse moléculaire inférieure ou égale à 812 g/mol, et une concentration totale en oligomères inférieure à environ 50 ppm pour tous les oligomères de masse moléculaire inférieure ou égale à 240 g/mol. D'autres préparations de polyalkylènes, en particulier des préparations de polyéthylène glycols, sont caractérisées par une concentration totale en oligomères inférieure à environ 90 ppm pour tous les oligomères de masse moléculaire inférieure ou égale à 460 g/mol, et sont obtenues sans autre transformation visant à éliminer les oligomères de masse moléculaire inférieure à environ 460 g/mol. La présente invention concerne également des méthodes d'élaboration de telles préparations.

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