Liquid catalyst formulation for transesterification processes, especially for the solvent-free production of polycarbonate from diphenol and diaryl carbonate

摘要

A catalyst formulation which is liquid at room temperature contains 28-45 wt.% tetraphenylphosphonium phenolate (TPPP) and 72-55 wt% phenol. An Independent claim is also included for a process for the production of solvent-free, thermoplastic polycarbonates from aromatic diphenols, diaryl carbonates and optionally chain-branching agents and/or mono-phenols, in which the above catalyst formulation is used as the transesterification catalyst in amounts of 10<-1> to 10<-8> mol to 1 mol diphenol.