| 摘要 |
An aromatic polyester having improved heat resistance, hydrolysis resistance and alkali resistance which comprises recurring units of the general formula: <IMAGE> and recurring units of the general formula: <IMAGE> wherein R1 and R2 are an alkyl or alkoxyl group having 1 to 4 carbon atoms, R3, R4, R5 and R6 are the same or different and each is an alkyl or alkoxyl group having 1 to 4 carbon atoms, Cl or Br, x and y are an integer of 1 to 4, z, x', y' and z' are 0 or an integer of 1 to 4, and X is an alkylidene or cycloalkylidene group having 1 to 8 carbon atoms, -O-, -S-, -SO2- or -CO-. |
