Patent ID: 8871703

Claim:
An aqueous polyester concentrate having a proportion by weight of polyester of 12 to 60%, wherein the polyester is prepared by polymerizing the components selected from the group consisting of 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 the molar ratio of components c) 1,2-propylene glycol to d) ethylene glycol is greater than or equal to 1.70.