| 摘要 |
PURPOSE:In interfacial polymerization, to obtain a polyester having improved heat resistance and molding properties in high reproducibility, by bringing an alkali aqueous solution of a bisphenol into contact with a solution of an acid chloride in an organic solvent with vigorous stirring in a short time so that the solutions are dispersed rapidly and uniformly. CONSTITUTION:In subjecting a solution of a dicarboxylic acid dihalide shown by the formula I (carbonyl is in m-position and p-position each other; X is halogen) in an organic solvent and an alkali aqueous solution of bisphenol shown by the formula II (OH is in m-position or p-position based on -SO2-) and shown by the formula III (OH is in m-position or p-position based on Y; Y is 1-20C bifunctional hydrocarbon, -O-, etc.; a is 0, or 1; R1-4 are H, or 1-8C hydrocarbon or halogen; when Y is -SO2- and a is L, R1-R4 are not H simultaneously) to interfacial polymerization in a ratio of 0.36-1.06mol of the bisphenol shown by the formula II and 0.04-0.66mol of the bisphenol shown by the formula III based on 1mol of the dihalide (total amount of both the bisphenols is 0.90-1.10mol), polymerization is carried out with vigorous stirring in such a way that the polymerization time tc and the addition time ta satisfy the relationship shown by the equation 0<ta<=1/5tc.
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