Polyesters comprising structural units with sulfonate groups, and polyalkoxy ether end groups, detergents, and cleaning agents comprising these and their use

Polyesters, based on all the structural units and end groups in the molecule, comprising

• 4 to 30% by weight of structural units of formula (I) or of formula (II) or of formulae (I) and (II),
• 0.25 to 10% by weight of structural units of formula (III) or of formula (IV) or of formulae (III) and (IV), and
• 0 to 5% by weight of structural units of formula (V)
• Wherein the following structural units represent the formulae (I through VII):
• —CO—R1—CO—O—C2H4—O— (I),
• —CO—R1—CO—O—(C3H6—O)— (II),
• —CO—R2—CO—O—C2H4—O— (III),
• —CO—R2—CO—O—(C3H6—O)— (IV),
• —CO—R3—CO—O—R4—O— (V),
• 50 to 95% by weight of nonionic endgroups of formula (VI), and
• 0 to 5% by weight of nonionic endgroups of formula (VII)
• —CO—(O—C2H4—)n—OR5 (VI),
• —CO—OR6 (VII),
• and wherein further:
• R1 is a divalent aromatic hydrocarbon radical without sulfo groups or without salts of sulfo groups,
• R2 is a divalent aromatic hydrocarbon radical substituted with at least one sulfo group or with the salt of a sulfo group,
• R3 is an alkylene, cycloalkylene or arylene radical,
• R4 is an alkylene or cycloalkylene radical, provided that the structural unit of formula (V) is different from the structural units of formulae (I), (II), (III) and (IV),
• R5 is C1-C6 alkyl, cycloalkyl, aryl or aralkyl,
• R6 is a monovalent organic radical, and
• n is a number between 55 and 500.