| 摘要 |
A process for producing oxybenzoyl copolyesters comprising 3 to 300 of repeating unit of the formula, <IMAGE> (I) <IMAGE> wherein m and n are each 0 or 1, and W is -O-, -SO2-, -S- or -CO-, which comprises reacting a compound of the formula, <IMAGE> (II) wherein R1 is a hydrogen atom, a benzyl, lower alkyl or phenyl group, and Y is a hydrogen atom or a lower alkanoyl group, with a compound of the formula, <IMAGE> (III) wherein X is a halogen atom, in the presence of an aliphatic, alicyclic or aromatic hydrocarbon solvent having a boiling point of 100 DEG to 260 DEG C. under atmospheric pressure to produce bis(carboxyphenyl)phthalate, adding a compound of the formula, <IMAGE> (V) wherein W is -O-, -SO2-, -S- or -CO-, Z is a hydrogen atom or an alkanoyl group, and m and n are each 0 or 1, and optionally a compound of the formula, <IMAGE> (IV) wherein R2 and R3 are each a hydrogen atom, a benzyl, lower alkyl or phenyl group, and carrying out polycondensation with the removal of the solvent and byproducts so that the polycondensation system is made substantially free from the solvent at least at the end of the polycondensation to carry out substantial bulk polycondensation. |
