| abstract |
In a process of preparing aromatic polyesters from (A) aromatic dicarboxylic acids and (B) diphenols by the solid phase polymerization method, the speed of the solid phase polymerization reaction can be enhanced to a marked degree by copolymerizing (C) an aliphatic dihydroxy compound, and in this case the amounts in which the components (B) and (C) are used, based on (A), being 70 - 105 mol % of (B) and 1 - 50 mol % of (C), with the total amount of (B) and (C) corresponding to 100 - 130 mol % of (A). |