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View Prior Art for Claim 00001

A method of preparing a cyclic monomer, comprising:forming a first mixture comprising a precursor compound, bis(pentafluorophenyl) carbonate, and a catalyst; wherein the precursor compound has a structure comprising a) two or more carbons, and b) two functional groups selected from the group consisting of primary amine, secondary amine, thiol group, hydroxyl group, and combinations thereof, and

agitating the first mixture at a temperature effective to form a second mixture comprising the cyclic monomer, the cyclic monomer selected from the group consisting of a cyclic carbonate, a cyclic carbamate, a cyclic urea, a cyclic thiocarbonate, a cyclic thiocarbamate, and a cyclic dithiocarbonate.

#693Cyclic polycarbonate oligomers and methods for their preparation and use

Applies to Claims 1,13,14,15,18,19,3,4,5

Submitted by: Shaojun YaoLast updated: over 2 years ago

Patent/Application # 4644053

Description

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 alkaili metal hydroxides and various amines. The oligomer mixtures may be converted to polycarbonates or their thiol analogs by a method which is particularly adaptable to integration with polycarbonate processing operations.

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