Use of anionic polymers that carry urethane and/or urea groups for modifying surfaces

A structure as claimed in any of the preceding claims, where the polymer is obtained from

• a) at least one polyisocyanate,
• b) at least one compound having at least one group reactive toward isocyanate groups and also having at least one group which is anionic or capable of conversion into an anionic group,
• and also, where appropriate, from at least one other compound which differs from b) and has at least one group reactive toward isocyanate groups,
• where component b) has at least one compound having at least one anionic group, or where at least some of the groups capable of conversion into anionic groups in the polymer are present in the form of the products of their reaction with at least one neutralizing agent.

The use of polymers which have urethane groups and/or urea groups, and also anionic groups, where the content of urethane groups and/or urea groups is at least 2 mol/kg of polymer and where the polymer has a content of from 0.5 to 5 mol/kg of anionic groups, and which are obtained from

• a) at least one polyisocyanate,
• b) at least one compound having at least one group reactive toward isocyanate groups and also having at least one group which is anionic or capable of conversion into an anionic group,
• and also, where appropriate, from at least one other compound which differs from b) and has at least one group reactive toward isocyanate groups,
• where component b) has at least one compound having at least one anionic group, or where at least some of the groups capable of conversion into anionic groups in the polymer are present in the form of the products of their reaction with at least one neutralizing agent, for modifying the surface properties of solids.

A process for modifying the surface properties of particulate, linear, sheet-like, or three-dimensional structures, by applying, to the surface of these, an effective amount of a polymer which has urethane groups and/or urea groups, and also anionic groups, where the content of urethane groups and/or urea groups is at least 2 mol/kg of polymer and where the polymer has a content of from 0.5 to 5 mol/kg of anionic groups, and which is obtained from

• a) at least one polyisocyanate,
• b) at least one compound having at least one group reactive toward isocyanate groups and also having at least one group which is anionic or capable of conversion into an anionic group,
• and also, where appropriate, from at least one other compound which differs from b) and has at least one group reactive toward isocyanate groups,
• where component b) has at least one compound having at least one anionic group, or where at least some of the groups capable of conversion into anionic groups in the polymer are present in the form of the products of their reaction with at least one neutralizing agent.

A process for modifying the surface properties of particulate, linear, sheet-like, or three-dimensional structures, by modifying the material of which the structure is composed with an effective amount of a polymer which has urethane groups and/or urea groups, and also anionic groups, where the content of urethane groups and/or urea groups is at least 2 mol/kg of polymer and where the polymer has a content of from 0.5 to 5 mol/kg of anionic groups which is obtained from

• a) at least one polyisocyanate,
• b) at least one compound having at least one group reactive toward isocyanate groups and also having at least one group which is anionic or capable of conversion into an anionic group,
• and also, where appropriate, from at least one other compound which differs from b) and has at least one group reactive toward isocyanate groups,
• where component b) has at least one compound having at least one anionic group, or where at least some of the groups capable of conversion into anionic groups in the polymer are present in the form of the products of their reaction with at least one neutralizing agent, and producing the structure therefrom.