Patent ID: 8017722
Filing Date: 2011-09-13
Classification: C08G,Y10T

Abstract:
1. A plant-derived component-containing polycarbonate represented by the following formula (3): wherein R 1 -R 4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl, and n is the number of repeating units, produced by a process of melt polycondensation using as the starting materials a diol represented by the following formula (1), having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography: wherein R 1 -R 4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl, and a carbonic acid diester represented by the following formula (2), having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography: wherein R 5 and R 6 are groups selected from among alkyl, cycloalkyl and aryl, and R 5 and R 6 may be the same or different groups, wherein the polycarbonate satisfies at least one of the following (A) and (B): (A) the molar ratio between the total of ends having a structure represented by the following formula (4) and ends having a structure represented by the following formula (5) in the polymer, and diol residues represented by the following formula (6) in the polymer, is 1×10 R 5 in formula (4) and R 6 in formula (5) have the same definitions as in formula (2); R 1 , R 2 , R 3 and R 4 in formula (6) have the same definitions as in formula (1); (B) the molar ratio between the total of ends having a structure represented by the following formula (7) and ends having a structure represented by the following formula (8) in the polymer, and diol residues represented by the following formula (9) in the polymer, is no greater than 1×10 R 5 in formula (7) and R 6 in formula (8) have the same definitions as in formula (2); R 1 , R 2 , R 3 and R 4 in formula (9) have the same definitions as in formula (1).