Heat resistant, neutral colour, antimony-free polyesters and process for their preparation

(-- A summary 57) (correction -- an owner) Subject The method for manufacturing the colorless polyester which does not contain antimony by heat stability, and the product manufactured by this method are offered. Solution means In the existence of 20*120 ppm of ester interchange catalysts, it is performed by the ester interchange and subsequently, After etherification or an ester interchange is completed, phosphoric acid, phosphorous acid and/or phosphonic acid, or those derivatives in etherification or ester interchange batch as a 錯形成 agent, 99% or less of 量加えられ of the equivalent to the amount of 100% and the cobalt used of the equivalent to the ester interchange catalyst used, If it is that it is suitable during the existence of 1*10 ppm of titanium added with the form of a titanium compound, without adding less than cobalt 80ppm of the form of a cobalt compound to a batch, and a polycondensation adding antimony, 1, 000 ppm or less of organic compounds which give a bridge construction structure machine, and the method which will be performed in the existence of 50 ppm or less of fluorescent bleaches if it is that it is suitable.