Water-dispersible polyisocyanate mixtures, a process for their preparation and their use in two-component aqueous compositions

A process for the preparation of a polyisocyanate mixture which

• a) has an average isocyanate functionality of 1.8 to 4.2,
• b) contains 12.0 to 21.5% by weight of (cyclo)aliphatically bound isocyanate groups (calculated as NCO, molecular weight=42),
• c) contains 2 to 20% by weight of ethylene oxide units (calculated as C.sub.2 H.sub.4 O, molecular weight=44) arranged within polyether chains, the polyether chains containing an average of 5.0 to 9.9 ethylene oxide units and
• d) is not prepared from or does not contain 1,6-hexamethylene diisocyanate,
• which comprises reacting at an NCO/OH equivalent ratio of 4:1 to 120:1
• A) a polyisocyanate component having an average isocyanate functionality of 2.1 to 4.4 and containing one or more polyisocyanates other than 1,6-hexamethylene diisocyanate in which all of the isocyanate groups are (cyclo)aliphatically bound with
• B) a monovalent polyalkylene oxide polyether alcohol containing an average of 5.0 to 9.9 ethylene oxide units.

A composition which comprises

• I) a water-dispersible polyisocyanate mixture which
• a) has an average isocyanate functionality of 1.8 to 4.27,
• b) contains 12.0 to 21.5% by weight of (cyclo)aliphatically bound isocyanate groups (calculated as NCO, molecular weight=42),
• c) contains 2 to 20% by weight of ethylene oxide units (calculated as C.sub.2 H.sub.4 O, molecular weight=44) arranged within polyether chains, the polyether chains containing, on average, 5.0 to 9.9 ethylene oxide units and
• d) is not prepared from or does not contain 1,6-hexamethylene diisocyanate and
• II) a water soluble or water-dispersible aqueous resin containing isocyanate reactive groups.