| 20090054621 | METHOD FOR MAKING POLYETHYLENE GLYCOL CARBONATES - 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. | 02-26-2009 |
