Low-crystallization-speed polyesters obtained by means of the polycondensation of 2,6-naphthalene-dicarboxy acid with at least one (C₂-C₁₀)-(cyclo)-alkylene glycol in the presence of 0.5-50 mol % of a copolymerizable reactant of general formula:
ROOC-Ar-OOC-Ar'-COO-Ar-COOR (I)
wherein Ar and Ar' stand for aromatic radicals, and R stands for a hydrogen atom or a (C₁-C₄)-alkyl radical, or the OR group is replaced by a halogen.
在 0.5-50 mol % 的通式可共聚反应物存在下,通过 2,6-
萘二
甲酸与至少一种 (C₂-C₁₀)-(环)-亚烷基二醇缩聚而得到的低结晶速度聚酯:
ROOC-Ar-OOC-Ar'-COO-Ar-COOR (I)
其中 Ar 和 Ar'代表芳香基,R 代表氢原子或(C₁-C₄)烷基,或者 OR 基团被卤素取代。