Process for preparing poly(alkylene carbonates)

Details Process for preparing poly(alkylene carbonates) Process for preparing poly(alkylene carbonates)

C - Chemistry, Metallurgy

08

G

402/173

C08G 64/02 (2006.01) C08G 64/30 (2006.01) C08G 64/34 (2006.01)

Patent

CA 1268288

ABSTRACT This invention relates to an improved process for the preparation of poly(alkylene carbonate) polymer by the reaction of alkylene oxide with carbon dioxide and/or an alkylene carbonate at an elevated temperature and pressure. The improvement comprises conducting said reaction in the presence of a catalyst mixture comprising an alkaline catalyst and a stannate com- pound. It is preferred to employ either ethylene oxide or propylene oxide because they are generally most reactive and give rise to the fewest by-products. Of these two, ethylene oxide is most preferred. It is also preferred to employ either sodium stannate or potassium stannate as the stannate compound and potassium carbonate, sodium metaborate, potassium 33,205-F hydroxide or potassium metaborate as the alkaline catalyst. 33,205-F

526360

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