Amorphous polyamides with a transparent glass transition temperature high

摘要

Amorphous and transparent copolyamides having glass transition temperatures, Tg, greater than 140 DEG C. and improved thermomechanical properties, well adopted for the production of a wide variety of useful shaped articles, contain specified amounts of terephthalic acid, 2-methylpentamethylenediamine and hindered aromatic diamine recurring structural units.