Slowly crystallizing polyesters of 2,6-naphthalene-dicarboxylic acid and process for their preparation.

摘要

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.