plicondensazione catalysts for the synthesis of polyethylene terephthalate

摘要

describes a class of catalysts for use in the stage of polycondensation in the synthesis of poly (ethylene terephthalate)consisting of derivatives of metals and non metals in composition with sulphonic acids in mixture with compounds of titanium, such that the final polymer appears to contain a quantity of sulphur as 5 - 60ppm and a quantity of metals between 2 and 100 ppm.