Terephthalic Acid → 2,6-Naphthalenedicarboxylic acid

Participants

Reaction Steps

The ester exchange reaction was carried out according to a conventional method in a mixture of 100 weight % dimethyl terephthalate, 14 weight % dimethyl naphthalene-2,6-dicarboxylate and 80 weight % ethylene glycol. The resulting mixture was mixed with 0.05 weight % antimony trioxide and gradually heated and evacuated. Polymerization was carried out at 280° C. and 0.5 mmHg. Thus, modified polyester containing a terephthalic acid and naphthalene-2,6-dicarboxylic acid unit (90/10, mol ratio) was obtained. The intrinsic viscosity of the resulting modified polyester was 0.7 cc/g.

Provenance & Evidence