LINEAR COPOLYESTERS BASED ON TEREPHTHALIC AND/OR ISOPHTHALIC ACID, A PROCESS FOR THEIR FACTURE AND THEIR USE

摘要

Linear copolyesters containing amide groups are obtained by polycondensing certain dicarboxylic acid diamides which are obtained by reacting 1 mol of a N-heterocyclic-aliphatic diamine with 2 mols of terephthalic acid, isophthalic acid or amide-forming derivatives thereof, to a relative viscosity higher than 1.2, with terephthalic acid, isophthalic acid or polyester-forming derivatives and with alkanediols.