Re-dispersible or re-soluble aqueous ethylenically unsaturated aqueous polyurethane compositions with improved water-resistance

A composition comprising

• (i) at least one polyurethane (1) carrying ethylenically unsaturated groups and COOH groups,
• wherein COOH groups are at least partly in the form of a salt group thereof,
• wherein polyurethane (1) is obtainable-obtained by the reaction of
• at least one polyol (B1) carrying at least one COOH group,
• at least monoalcohol (B2) carrying at least one ethylenically unsaturated group,
• optionally at least polyol (B3) carrying at least one ethylenically unsaturated group and no COOH group,
• at least one polyol (B4) carrying no ethylenically unsaturated group and no COOH group,
• at least one polyisocyanate (A1) carrying at least one ethylenically unsaturated group,
• optionally at least one polyisocyanate (A2) carrying no ethylenically unsaturated group, and
• optionally at least one compound (C1) carrying at least one NH2 group and no OH group,
• wherein the equivalent ratio of ethylenically unsaturated groups of polyisocyanate (A1)/ethylenically unsaturated groups of components (B1), (B2), (B3), (A1) and (C1) is in a range of from 0.20/1.00 to 0.95/1.00, and
• wherein the equivalent ratio of NCO groups of polyisocyanate (A1) and (A2)/OH groups of components (B1), (B2), (B3) and (B4) is in a range of from 1.00/1.00 to 1.50/1.00,
• (ii) water, and
• (iii) optionally at least one compound (2) carrying at least one ethylenically unsaturated group and no COOH group.