Aromatic polyester of 2,6 and/or 2,7 naphthalene dicarboxylic acid

摘要

A linear aromatic polyester comprising, in the polymer molecule, at least 50 mole % of a repeating unit being represented by the formula IN WHICH R1 and R2 are the same or different and represent an alkyl group of 1-3 carbons, n is an integer of 1-6, X is a halogen atom and m is 0, 1 or 2, WITH AN INTRINSIC VISCOSITY OF 0.3 OR MORE WHEN MEASURED AT 35 DEG C. by use of orthochlorophenol as a solvent.