NEW,LINEAR HOMOPOLYESTERS AND COPOLYESTERS BASED ON TEREPHTHALIC ACID AND/OR ISOPHTHALIC ACID

摘要

New homopolyesters and copolyesters are obtained by esterifying 1,3-bis-(hydroxyalkyl)-benzimidazolones and optionally alkanediols with terephthalic acid and/or isophthalic acid or their polyester-forming derivatives in a known manner and subsequently polycondensing the product. The new homopolyesters and copolyesters are distinguished by better mechanical properties than conventional polyalkylene phthalates and are in particular suitable for use as "engineering plastic" materials.