Polyesters from terephthalic acid, 2,6-naphthalenedicarboxylic acid and hydroquinone

A wholly aromatic unsubstituted polyester comprising:

• (A) an acid component comprising repeating units of about 35 to 60 mol percent of terephthalic acid and about 65 to 40 mol percent 2,6-naphthalenedicarboxylic acid--together both being at least 90 mol percent--, and
• (B) an aromatic diol component comprising repeating units of at least 90 mol percent hydroquinone
• wherein the total mol percent of acid component and aromatic diol component are each 100 mol percent;
• said polyester being insoluble in pentafluorophenol and having a melting point below about 450.degree. C.