| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing polycarbonate exhibiting excellent mechanical strength, heat resistance, a small refractive index, a large Abbe number, small birefringence, and excellent transparency, and containing a raw material resulting from vegetables, and to provide moldings of the polycarbonate. <P>SOLUTION: The method for producing a polycarbonate comprises a step of reacting a dihydroxy compound containing a dihydroxy compound having at least one connecting group represented by -CH<SB>2</SB>-O- in the molecule with a carbonic diester in the presence of a polymerization catalyst, wherein the content of formic acid in the dihydroxy compound having at least one connecting group represented by -CH<SB>2</SB>-O- in the molecule is less than 20 ppm. The moldings are made of either a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one connecting group represented by -CH<SB>2</SB>-O- in the molecule and which exhibits an Abbe number of 50 or above and a 5% weight loss temperature of 340°C or above, or a composition comprising the polycarbonate. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
