Method of preparing high molecular weight poly(alkylene...

Details Method of preparing high molecular weight poly(alkylene... Method of preparing high molecular weight poly(alkylene...

C - Chemistry, Metallurgy

07

C

260/386, 402/498

C07C 69/96 (2006.01) C08G 18/44 (2006.01) C08G 64/40 (2006.01)

Patent

CA 1311764

- ? - ABSTRACT The invention is a process for increasing the molecular weight of a poly(alkylene carbonate) polyol which comprises exposing the poly(alkylene carbonate) polyol to elevated temperatures at which dialkylene glycol, trialkylene glycol, or initiator segments, wherein the initiator has about the same or greater volatility as the dialkylene glycol or trialkylene glycol segment, are abstracted from the poly(alkylene carbonate) polyol, at a pressure wherein the dialkylene glycol, trialkylene glycol, or initiator is volatile, and removing the volatile dialkylene glycol, trialkylene glycol, or initiator from the mass of the poly(alkylene carbonate) polyol, under conditions such that the molecular weight of the poly(alkylene carbonate) polyol is increased. 32,577-F

512740

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