Method of producing polycarbonates
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United States of America Patent
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Dec 28, 2004
Grant Date -
N/A
app pub date -
Aug 5, 2002
filing date -
Nov 3, 1999
priority date (Note) -
Expired
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Abstract
A process for the preparation of polycarbonate by the phase boundary process is disclosed. The process entails reacting at least one dihydroxydiarylalkane in the form of its alkali metal salts with phosgene in the heterogeneous phase in the presence of sodium hydroxide solution and an organic solvent. The process is characterized in that the feedstock have but low content of Fe, Cr, Ni, Zn, Ca, Mg, Al metals or homologues thereof, and in that the organic solvent is separated off, and in that the polycarbonate which is obtained is worked up. The resulting polycarbonate is particularly useful in producing transparent shaped articles.
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