Patent ID: 6265523
Filing Date: 2001-07-24
Classification: C08G

Abstract:
A process for producing an aromatic/aliphatic copolycarbonate having a nitrogen content of 9 ppm or lower, which comprises subjecting an aromatic dihydroxy compound represented by the following formula (1), an aliphatic dihydroxy compound represented by the following formula (2), and a carbonic diester to polycondensation under heating and melting, wherein the aliphatic dihydroxy compound having a nitrogen content of 10 ppm or lower is used: ##STR6##(wherein X is ##STR7##wherein R.sub.3 and R.sub.4 each is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a phenyl group, or R.sub.3 and R.sub.4 may be bonded to each other to form a ring; R.sub.1 and R.sub.2 may be the same or different and each is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a halogen atom; and wherein m and n indicate the number of substituent R.sub.1 and R.sub.2 groups, respectively, and each of m and n is an integer in the range of 0 to 4); ##STR8##(wherein R.sub.5, R.sub.6, R.sub.7, and R.sub.8 each is a hydrogen atom or a univalent alkyl group having 1 to 10 carbon atoms).