Patent ID: 6596839
Filing Date: 2003-07-22
Classification: C08G

Abstract:
A process for producing a wholly aromatic polyester comprising melt polycondensing by heating an aromatic dicarboxylic acid represented by the following formula (I):HOOCâ€”A1â€”COOHâ€ƒâ€ƒ(I) wherein A1 is a substituted or unsubstituted divalent aromatic group having 6 to 20 carbon atoms, an aromatic diol represented by the following formula (II):HOâ€”A2â€”Xâ€”A3â€”OHâ€ƒâ€ƒ(II) wherein A2 and A3 are each independently a substituted or unsubstituted phenylene group, and X is a group represented by the following formula: wherein R1, R2, R3 and R4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 6 carbon atoms, cycloalkyl group having 5 to 6 carbon atoms, aryl group having 6 to 12 carbon atoms or aralkyl group having 7 to 12 carbon atoms, and q is an integer of 4 to 10, with the proviso that R3's and R4's may be the same or different, and a diaryl carbonate in the presence of at least one catalyst selected from the group consisting of (a) a combination of a pyridine compound represented by the following formula (III): wherein R5 and R6 are each independently a hydrogen atom, alkyl group having 1 to 6 carbon atoms, cycloalkyl group having 5 to 10 carbon atoms, aryl group having 6 to 12 carbon atoms or aralkyl group having 7 to 12 carbon atoms, or R5 and R6 together with a nitrogen atom bonded thereto may be bonded together to form a 5- to 7-membered ring, R7 is an alkyl group having 1 to 6 carbon atoms, cycloalkyl group having 5 to 10 carbon atoms, aryl group having 6 to 12 carbon atoms or aralkyl group having 7 to 12 carbon atoms, and n is an integer of 0 to 4, with the proviso that when n is an integer of 2 to 4, R7's may be the same or different, and an alkali metal carbonate or an alkali metal bicarbonate, (b) a combination of a pyridine compound represented by the above formula (III) and an organic tin compound represented by the following formula (IV): wherein R8 is an alkyl group having 1 to 20 carbon atoms, or unsubstituted or substituted aryl group having 6 to 20 carbon atoms, R9 is an alkyl group having 1 to 20 carbon atoms, or unsubstituted or substituted aryl group having 6 to 20 carbon atoms, R10 is a single bond, alkylene group having 1 to 10 carbon atoms, or unsubstituted or substituted arylene group having 6 to 20 carbon atoms, and p+r+2s=2 or 4, with the proviso that when p+r+2s=2, p=0 or 1, r=0, 1 or 2 and s=0 or 1, and when p+r+2s=4, p=0 to 3, r=0 to 4 and s=0 to 2, and (c) an organic titanium compound represented by the following formula (V):Ti(OR11)4â€ƒâ€ƒ(V) wherein R11 is an alkyl group having 1 to 6 carbon atoms, cycloalkyl group having 5 to 10 carbon atoms, aralkyl group having 7 to 12 carbon atoms or aryl group having 6 to 12 carbon atoms, with the proviso that R11's may be the same or different.