A process for the preparation of a block oligocarbonate

Details A process for the preparation of a block oligocarbonate A process for the preparation of a block oligocarbonate

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2083923

Mo-3666CIP MD 91-34CIP A PROCESS FOR THE PREPARATION OF A BLOCK OlIGOCARBONATE ABSTRACT OF THE DISCLOSURE A process for preparing a block oligocarbonate is disclosed. The oligocarbonate conforms to R-A-B-A-R or Image where R denotes hydrogen or Image , and where A denotes an aromatic carbonate structure conforming to Image where Ar is an aromatic radical, n is 2-6 and where B is the residue of an aliphatic polyol is disclosed. In the process a high molecular weight aromatic polycarbonate is reacted, in the melt and in the presence of a catalyst, with an aliphatic polyol. The block oligocarbonate is useful as a reactant in a process for the preparation of copolymers.

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