Process for producing substantially linear carbonate polymer

Details Process for producing substantially linear carbonate polymer Process for producing substantially linear carbonate polymer

C - Chemistry, Metallurgy

08

G

402/175

C08G 64/22 (2006.01) C08G 64/02 (2006.01)

Patent

CA 1170395

Abstract of the Disclosure In the preparation of a substantially linear carbonate polymer wherein carbonic dihalide is introduced to a substantially anhydrous solu- tion comprising at least one substituted or unsubstituted l,3-propanediol, the coproduction of cyclic carbonate is reduced by the presence in the solution of a catalytic amount of nitrogen-containing, hydrohalide salt- forming, thermally regenerable organic catalyst. The preferred carbonic dihalide is phosgene and the preferred catalyst is pyridine.

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