| 主权项 |
1: A water-emulsifiable polyisocyanate, comprising:
an polyisocyanate based on at least one (cyclo)aliphatic diisocyanate, a compound comprising at least two two isocyanate-reactive groups and at least one selected from the group consisting of a thioether group (—S—), a selanyl group (—Se—), a sulfoxide group (—S(═O)—), and a sulfone group (—S(═O)2—), a compound comprising an isocyanate-reactive group and a dispersive group, and optionally a solvent; wherein:
the ratio of NCO groups in the polyisocynate to isocyanate-reactive groups in the compound comprising at least two isocyanate groups and at least one group selected from the group consisting of a thioether group (—S—), a selanyl group (—Se—), a sulfoxide group (—S(═O)—), and a sulfone group (S(═O)2—) and the compound comprising an isocyanate-reactive group and a dispersive group is 5:1 to 100:1,the ethylene oxide group content, calculated as 44 g/mol, based on the sum of the polyisocyanate based on at least one (cyclo)aliphatic diisocyanate, the compound comprising at least two isocyanate groups and at least one group selected from the group consisting of a thioether group (—S—), a selanyl group (—Se—), a sulfoxide group (—S(═O)—), and a sulfone group (—S(═O)2—) and the compound comprising an isocyanate-reactive group and a dispersive group is at least 12 wt. %,the amount of the compound comprising an isocyanate-reactive group and a dispersive group, based on the polyisocyanate based on at least one (cyclo)aliphatic diisocyanate, is at least 5 and up to 25 wt. %, andthe viscosity at 23° C. to DIN EN ISO 3219/A.3 (October 1994) in a cone/plate system with a shear rate of 1000 s−1 is from 2500 mPas to 12 000 mPas. |
