Process for Manufacturing Polyethylene Terephthalate

摘要

The invention relates to a process for producing a polyester resin, said process comprises the steps of
(i) providing a mixture of terephthalic acid, monoethylene glycol, a polycondensation catalyst which contains antimony, a phosphorous containing stabilizer comprising a compound of the formula (I)
and optionally a colour correction additive containing cobalt ions;
(ii) heating said mixture to a temperature of 220 to 270°C to provide bis-hydroxyethylterephthalic acid ester; and
(iii) performing polycondensation of said bis-hydroxyethylterephthalic acid ester at a temperature of between 280 and 310°C at reduced pressure.