MANUFACTURE OF POLYARYLATE RESIN

摘要

PROBLEM TO BE SOLVED: To obtain a resin which has a high molecular weight and little content of a residual polymerization catalyst and shows excellent mechanical properties and electric properties by subjecting a dihydric phenol and an aromatic dicarboxylic acid halide to an interfacial polycondensation reaction by use of a quaternary ammonium salt having a specific number of n-propyl groups or a quaternary phosphonium salt as a polymerization catalyst. SOLUTION: An alkali aqueous solution of a dihydric phenol is prepared as an aqueous phase. To the solution is added a quaternary ammonium salt having 3 to 4 n-propyl groups represented by formula I or a quaternary phosphonium salt represented by formula II as a polymerization catalyst (wherein R1 is an alkyl group having not more than 4 carbon atoms or the like; and X is Cl, Br or the like), the amount thereof being 0.1 to 2.0 mol% of the dihydric phenol. Then an aromatic dicarboxylic acid halide is dissolved in a solvent which is insoluble in water but dissolves a polyarylate resin to produce an organic phase. The organic phase solution is mixed with the aqueous phase solution and the mixture is subjected to an interfacial polycondensation reaction while stirring to produce a high molecular weight polyarylate resin.