Method for making polyethylene glycol carbonates
AssigneeDr. Reddy's Laboratories (Eu) Limited
InventorDaniel E. Verral
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Abstract
A method for making a alkyl polyethylene glycol carbonate by the step of: (a) reacting mono-alkyl polyethylene glycol (MPEG) such as MPEG having an average molecular weight of 20,000 grams per mole and a polydispersity of less than 1.1, a chloroformate such as p-nitrophenyl chloroformate, an aromatic solvent such as toluene and an amine such as tripentyl amine. And, a method for making a multi-armed polyethylene glycol carbonate by the step of: (a) reacting a multi-armed polyethylene glycol having at least one hydroxyl group, a chloroformate, an aromatic solvent and an amine.
Claims17
A method for making a polyalkylene glycol carbonate comprising the step of reacting a hydroxyl functional polyalkylene glycol and a reagent selected from carbonates and chloroformates in the presence of an aromatic solvent and an amine.
Dependencies are inferred from the claim text.