Polymers For The Treatment Of Surfaces

A polymer containing at least one repeating unit of the formula (I) and at least one repeating unit of the formula (II) and, where applicable, further repeating units,

• where
• G1 and G2 independently of one another represent a structural unit which contributes to the polymer backbone,
• A and A4 independently of one another denote a spacer group of a side chain of the polymer or a direct bond,
• A1 denotes a linking group of the catechol radical from formula (I) to the spacer group A or a direct bond,
• A3 denotes a linking group of the group X to the spacer group A4 or a direct bond,
• R2 and R3 independently represent a hydrogen atom, a C1-C4-alkyl group, a C2-C4 hydroxyalkyl group, a C1-C4-alkoxy group, a halogen atom, a sulfonic acid group, a C1-C10-alkylcarbonyloxy group, a C1-C10-alkoxycarbonyl group, a C6-C10-aryloxycarbonyl group, a C6-C10-arylcarbonyloxy group, C2-C10-alkenylcarbonyloxy group, a C2-C10-alkenyloxycarbonyl group, a hydroxyl group,
• an amino group, an ammonium group,
• X represents an amino group —N(R5)(R6) or an ammonio group —N+(R5)(R6)(R7) 1/n Ann-,
• where R5, R6 and R7 each independently represent a hydrogen atom, a C1-C4-alkyl group or a C2-C4 hydroxyalkyl group and 1/n An′ represents an equivalent of an n-valent anion,
• with the proviso that the repeating units of the formula (II) are different from the repeating units of the formula (I) and the molar ratio of the units of the formula (I) to the units of the formula (II) is in the range from 0.5-to-1 to 4-to-1.