Process for the preparation of oligocarbonates

Details Process for the preparation of oligocarbonates Process for the preparation of oligocarbonates

C - Chemistry, Metallurgy

07

C

260/466.8

C07C 69/96 (2006.01) C08G 18/44 (2006.01) C08G 64/02 (2006.01) C08G 64/30 (2006.01)

Patent

CA 1064956

ABSTRACT OF THE DISCLOSURE A process for the preparation of linear aliphatic polycarbonates having terminal hydroxyl groups is carried out in two stages: (i) in the first stage, the transesterification is carried out in the presence of a basic catalyst at a tempera- ture below 140°C, and (ii) in the second stage, after complete destruction of the basic catalyst, the transesterification is completed in the presence of an acid catalyst at a temperature of between 200 and 250°C. The polycarbonate-diols obtained are useful for the preparation of polyurethane elastomers which are resistant to hydrolysis.

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