Process of preparing polycarbonates
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United States of America Patent
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Jul 23, 2002
Grant Date -
Feb 21, 2002
app pub date -
Jul 11, 2001
filing date -
Jul 14, 2000
priority date (Note) -
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Abstract
The present invention relates to a process of preparing polycarbonates and more particularly, to the process of preparing polycarbonates through a melt polymerization reaction of dihydroxyaryl compounds with diarylcarbonate, wherein said melt polymerization is performed in the presence of a mixed catalyst composed of an oxygen (O) or sulfur (S) containing compound having lone-pair electrons and an alkali metal or alkaline earth metal salt in an appropriate ratio at a reduced temperature by accelerating a reaction rate to obtain high quality polycarbonates with higher than 15,000 g/mole of a viscosity average molecular weight and improved color.
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