How is Dacron obtained from ethylene glycol and terephthalic acid?

(N/A) Dacron (also known as Terylene) is obtained by the condensation polymerisation of ethylene glycol and terephthalic acid at high temperatures in the presence of a catalyst (zinc acetate-antimony trioxide).
The chemical reaction is as follows:
$n \ HOCH_2-CH_2OH + n \ HOOC-C_6H_4-COOH$ $\xrightarrow{\Delta, \text{catalyst}} -[OCH_2-CH_2-O-CO-C_6H_4-CO]_n- + 2n \ H_2O$