METHOD FOR THE PREPARATION OF POLYCARBONATE WITH REDUCED PHOSGEN EXCESS

The present invention relates to a process for producing polycarbonate according to a phase boundary process, from at least one dihydroxydiaryl alkane, phosgene, at least one catalyst and at least one chain terminator, the process allowing a reduction in the phosgene excess by a specific energy inpu...

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Bibliographische Detailangaben
Hauptverfasser: HEIJL, Jan, MICHELE, Volker, Dr, BACHMANN, Rolf, COCK, Felix
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:The present invention relates to a process for producing polycarbonate according to a phase boundary process, from at least one dihydroxydiaryl alkane, phosgene, at least one catalyst and at least one chain terminator, the process allowing a reduction in the phosgene excess by a specific energy input during the dispersion of the aqueous and organic phases. The process also produces a polycarbonate with a low proportion of oligomers and a low proportion of Di-chain terminator carbonate.