| abstract |
The invention concerns a method of producing, without using antimony, a polyester from poly(ethylene terephthalate) units. Following esterification, a mixed catalyst consisting of 10 to 75 ppm of lithium and 15 to 80 ppm of germanium is used for polycondensation. The antimony-free polyester thus obtained is suitable for use in the manufacture of bottles, sheeting, film, fibre, filaments and moulded articles. |