Patent ID: 7737244

Claim:
A process for preparing polyarylate by interfacial polymerization of a bivalent phenol compound and an aromatic dicarboxylic acid or a halide thereof, which comprises a step of adding a cationic catalyst for the phase transition and a nonionic surfactant to a reactor, wherein the cationic catalyst for the phase transition is at least one selected from the group consisting of tertiary amine, quaternary ammonium salt, quaternary arsonium salt, quaternary phosphate, and tertiary sulfonium salt, the nonionic surfactant has an HLB (Hydrophilic Lipophilic Balance) value of 4 to 20, the nonionic surfactant is added in an amount of 1 to 10,000 parts by weight, based on 100 parts by weight of the cationic catalyst for the phase transition, and the total weight of the mixed nonionic surfactant and cationic catalyst for the phase transition is 0.0001 to 10 parts by weight, based on 100 parts by weight of the bivalent phenol compound.