AROMATIC COPOLYESTERS BASED ON T.-BUTYL-4-HYDROXYBENZOIC ACID CAPABLE OF FORMING OPTICALLY ANISOTROPIC MELTS,THEIR PREPARATION AND ARTICLES MADE THEREFROM

摘要

Novel copolyesters derived from (a) aromatic diols, (b) dicarboxylic acids and (c) aromatic hydroxycarboyxlic acids, in which the aromatic hydroxycarboyxlic acid component (c) comprises 15 to 60 mole % the copolyester and in which t-butyl-4-hydroxybenzoic acid constitutes 25 to 100 mole % of the aromatic hydroxycarboxylic acid component (c), are disclosed. These copolyesters are anisotropic and fabricable in the melt. They generally can be processed using conventional thermoplastic shaping techniques at temperatures below 350 degrees C. into moldings, fibers and films which have outstanding mechanical properties.