Aqueous dispersions containing polyurethanes with carbodiimide groups

An aqueous dispersion suitable for preparing coated textiles, comprising, based on the solids content,

• A) from 10 to 100% by weight of a polyurethane (1) which carries hydrophilic groups which render the polyurethane dispersible in water
• B) optionally, from 5 to 90% by weight of a polymer (B) which is
• B1) a polyurethane (2) different from the polyurethane (1) and composed of
• a2) diisocyanates containing no carbodiimide groups
• b2) diols, of which
• b2.1) from 10 to 100 mol-%, based on the total amount of the diols (b1), have a molecular weight from 500 to 5000 g/mol, and
• b2.2) from 0 to 90 mol-%, based on the total amount of the diols (b2), have a molecular weight of from 60 to 500 g/mol,
• c2) monomers which are chemically different from the monomers (a2) and (b2) and which have at least one isocyanate group or at least one isocyanate-reactive group and which, furthermore, carry at least one hydrophilic group or one potentially hydrophilic group, thereby rendering the polyurethanes dispersible in water,
• d2) optionally, further polyfunctional compounds which are different from the monomers (a2) to (c1) and which have reactive groups which are alcoholic hydroxyls, primary or secondary amino groups or isocyanate groups, and
• e2) optionally, monofunctional compounds which are different from the monomers (a2) to (d2) and which have a reactive group which is an alcoholic hydroxyl, a primary or secondary amino group or an isocyanate group,
• or
• B2) is a polymer prepared by free-radically initiated polymerization (polymer 3) which is composed of
• a3) from 30 to 100 parts by weight of at least one monomer selected from the group consisting of C1- to C20-alkyl(meth)acrylates, vinyl esters of carboxylic acids having up to 20 carbon atoms, ethylenically unsaturated nitrites, vinylaromatic compounds having up to 20 carbon atoms, vinyl halides, and aliphatic hydrocarbons having 2 to 8 carbon atoms and 1 or 2 double bonds (monomers a3), and
• b3) from 0 to 70 parts by weight of other compounds I having at least one ethylenically unsaturated group (monomers b3)
• C) optionally, from 0.1 to 5% by weight of an emulsifier
• D) optionally, from 0.1 to 10% by weight of an amino resin or phenolic resin
• E) optionally, from 1 to 30% by weight of a flame retardant
• F) optionally, from 1 to 70% by weight of a kaolin, and
• G) optionally, from 1 to 30% by weight of an oleophobicizer.