Hydrophilically modified polyisocyanates comprising silane and thioallophanate structures

A hydrophilic polyisocyanate composition comprising a polyisocyanate component A) and an emulsifier component B), wherein the polyisocyanate component A) consists of at least one polyisocyanate having silane and thioallophanate structures of the general formula (I)

• in which
• R1, R2 and R3 are identical or different radicals and are each a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series of oxygen, sulfur and nitrogen,
• X is a linear or branched organic radical having at least 2 carbon atoms,
• Y is a linear or branched, aliphatic or cycloaliphatic, an araliphatic or aromatic radical having up to 18 carbon atoms and
• n is an integer from 1 to 20,
• and the emulsifier component B) comprises at least one ionic and/or nonionic emulsifier which is the reaction product of at least one polyisocyanate having silane and thioallophanate structures of the general formula (I) with ionic and/or nonionic compounds bearing groups that are reactive toward isocyanate groups.