| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polycarbonate which exhibits excellent mechanical strength, heat resistance, a small refractive index, a large Abbe number, small birefringence, and excellent transparency. <P>SOLUTION: The polycarbonate is obtained by melt polycondensation of a dihydroxy compound containing a dihydroxy compound having at least one connecting group represented by the formula: -CH<SB>2</SB>-O- in the molecule with a carbonic diester, wherein the reduced viscosity is 0.40 dl/g or more and 1.70 dl/g or less and the formic acid content is less than 5 ppm by weight. <P>COPYRIGHT: (C)2011,JPO&INPIT |
