Patent ID: 8871702

Claim:
A polyester prepared by polymerizing components a) at least one sulfo-free aromatic dicarboxylic acid, salt thereof, anhydride thereof, and/or ester thereof, b) optionally at least one sulfo-containing dicarboxylic acid, salt thereof, anhydride thereof, and/or ester thereof, c) 1,2-propylene glycol, d) ethylene glycol, e) at least one compound of the formula (1) R 1 O(CHR 2 CHR 3 O) n H (1) wherein R 1 is a linear or branched, saturated or unsaturated alkyl group having 1 to 22 carbon atoms, R 2 and R 3 are each independently hydrogen or an alkyl group having 1 to 4 carbon atoms, and n is a number from 1 to 50, f) optionally at least one compound of the formula (2) H—(OCH 2 CH 2 ) m —SO 3 X (2) wherein m is a number from 1 to 10 and X is hydrogen or an alkali metal ion, and g) optionally at least one crosslinking polyfunctional compound, with the proviso that at least one of components b) or f) is present, and with the further proviso that the molar ratio of components c) 1,2-propylene glycol to d) ethylene glycol is greater than or equal to 1.70.