Patent ID: 7335410

Claim:
A catalytic composition for the manufacture of polyester, the composition consisting essentially of, as Component I, a carrier substance on which catalytically effective metal compounds are adsorbed and, as Component II (a) one or more phosphonic acid compounds of the formula I wherein two of the groups R 1 , R 2 and R 3 are —H and the third group is —H or C 1-10 -alkyl, C 3-10 -cycloalkyl or C 6-10 -aryl, and R is C 2-10 -alkylene-carboxy, C 3-10 -cycloalkylene-carboxy or C 6-10 -arylene-carboxy, wherein the carboxy group is adjacent to R 1 , and/or b) one or more compounds of formula I wherein R is O and R 1 , R 2 and R 3 are independently tris-trialkylene glycol groups, and, optionally, a suspension agent.