Cyclic polycarbonate of thiol analog oligomers

Details Cyclic polycarbonate of thiol analog oligomers Cyclic polycarbonate of thiol analog oligomers

C - Chemistry, Metallurgy

07

D

402/172, 402/349

C07D 323/00 (2006.01) C07D 341/00 (2006.01) C08G 63/62 (1985.01)

Patent

CA 1238914

CYCLIC POLYCARBONATE OR THIOL ANALOG OLIGOMERS ABSTRACT OF TIE DISCLOSURE Cyclic polycarbonate (or thiol analog) oligomer mixtures are prepared by the reaction of bishaloformates or their thio analogs or mixtures thereof with dihydroxy or dimercapto compounds, with alkali metal hydroxides and various amines. The oligomer mixtures may be converted to polycarbonates or their thio analogs by a method which is particularly adaptable to integration with polycarbonate processing operations.

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