| 摘要 |
<p>A polycarbonate resin obtained by reacting a carbonate raw material with a dihydroxy compound, having: a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) of not more than 2.2:1, calculated as polystyrene, when measured by gel permeation chromatography; and a ratio (Mv/Mn') of a viscosity-average molecular weight (Mv) calculated according to the following formulae, to a number-average molecular weight (Mn') calculated based on the number of molecular ends, of not more than 1.40:1. <DFG> <DF> eta sp/C = eta x (1 + 0.28 eta sp) </DF> <DF> eta = 1.23 x 10<-4> x (Mv)<0.83> </DF> </DFG> wherein eta sp is a specific viscosity of the polycarbonate resin when measured with respect to a methylene chloride solution thereof at 20 DEG C; and C is a concentration of the methylene chloride solution, in the present case, the methylene chloride solution having a polycarbonate resin concentration of 0.6 g/dl is used. The above polycarbonate resin has a molecular weight distribution close to that of monodisperse system, and generates an extremely less amount of volatile components derived from oligomers, upon heat-molding thereof.</p> |
