Water-dispersible modified polyisocyanates

A water-dispersible modified polyisocyanate comprising a reaction product of a system comprising

• a. a water-dispersible polyisocyanate;
• and
• b. an isocyanate-reactive component;
• wherein the water-dispersible modified polyisocyanate comprises structures of formula I, II and III:
• wherein X is selected from O, S, NR9 and CR10R11;
• wherein R9, R10 and R11 may be identical or different and represent hydrogen or organic groups inert to isocyanate groups;
• and the ratio of moles of the carbon atoms in the carbonyl group of formula I to the sum of moles of the structures of formula II and III calculated according to carbon NMR spectrum is 0.005-0.24;
• and the viscosity of the water-dispersible modified polyisocyanate is 3000 mPa·s to 11000 mPa·s, measured with a MV-DIN rotor in accordance with DIN EN ISO 3219:1994-10 at 23° C. and at a shear rate of 10 s−1,
• wherein the component b) isocyanate-reactive component is one or more of water and compounds having a structure of formula IV:
• wherein Y is selected from O, N, S and O—CO, a is an integer greater than or equal to 1, b is an integer greater than or equal to 2, and R1 is an organic group that is inert to isocyanate groups, and wherein the compound having a structure of formula IV is one or more of polyacids with a molecular weight of 90 g/mol-1000 g/mol, polyamines with a molecular weight of 40 g/mol-1000 g/mol, polythiols with a molecular weight of 40 g/mol-1000 g/mol and low-molecular-weight hydroxy alcohols with a molecular weight of 40 g/mol-1000 g/mol, wherein the low-molecular-weight hydroxy alcohols are one or more of ethylene glycol, propylene glycol, butylene glycol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, 1,10-decanediol, isomeric pentanediols, 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,4-cyclohexylcyclohexanol, 4,4′-(1-methylethylene)dicyclohexanol, 1,1,1-trimethylolethane, 1,2,6-hexanetriol, 1,1,1-trimethylolpropane, 2,2-bis(hydroxymethyl)-1,3-propanediol, 1,2,4-trihydroxycyclohexane, 1,3,5-trihydroxycyclohexane, 1,3,5-tris(2-hydroxyethyl)isocyanurate and neopentyl glycolhydroxypivalate.