Processes for producing polycarbonate
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United States of America Patent
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May 21, 2013
Grant Date -
Feb 10, 2011
app pub date -
Dec 10, 2008
filing date -
Dec 13, 2007
priority date (Note) -
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Abstract
A subject for the invention is to provide a polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, reduced birefringence, and excellent transparency. The invention relates to a polycarbonate characterized by being obtained by subjecting one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof to melt polycondensation with a carbonic acid diester, and by having a reduced viscosity of from 0.40 dL/g to 1.70 dL/g and a formic acid content lower than 5 ppm by weight.
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