Polyisocyanate

Polyisocyanates are prepared by production of an addition product containing an isocyanate reactive group and an isocyanate group by reaction of a diisocyanate with compounds having two isocyanate reactive groups whereby at least one of components have functional groups having different reactivity to opposite functional groups of the other components. Polyisocyanates (I) are prepared by (A) production of an addition product containing an isocyanate reactive group and an isocyanate group by reaction of (A1) a diisocyanate with (A2) compounds having two isocyanate reactive groups whereby at least one of components (A1) or (A2) have functional groups having different reactivity to opposite functional groups of the other components. (B) optionally intermolecular addition reaction of the addition product (A) to form a polyaddition product that contains an isocyanate reactive group and an isocyanate group. (C) reaction of the addition product (A) and /or the polyaddition product from (B) with a di- or polyisocyanate (C1) that is different to (A1). An Independent claim is included for the polyaddition product (B).