POLYESTER HAVING GOOD COLOR TONE

摘要

PROBLEM TO BE SOLVED: To provide a polyester having a good color tone, particularly a polyethylene terephthalate having a good color tone.

SOLUTION: The polyester having a good color tone is produced by using a catalyst stabilization system comprising (1) a polymerization catalyst containing a titanium-containing compound of the formula: (MenO)x-(TiO2)y-(H2O)zand a zinc-containing compound, (2) a color-toning agent containing a compound of formula (II) and a cobalt-containing compound and (3) one or more hindered phenol antioxidants as a stabilizer. The catalyst stabilization system is used for improving the color tone of the polyester.

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