| abstract |
The invention relates to the reaction of at least one polysiloxane of structure (I), at least one polyisocyanate having at least three NCO groups, at least one (meth) acrylate of structure (II) and a compound that is optionally reactive to isocyanates As for the polyisocyanate adduct which can be obtained, wherein U is one of the groups of (III). m, n, x, and y are considered 0 to 10. And t = 2 to 30, s = 1 to 400, and i is 1 to 5. The radical represented by the letter R is suitable as an organic group. A Si is an OH, NH 2 , or CO 2 H group. And m + n + x + y ≥ 3. The invention also relates to a process for preparing a polyisocyanate adduct and to a radiation curable coating composition comprising at least one radiation curable polymer and at least one polyisocyanate adduct of the invention as a binder. The invention also relates to the use as additives of the polyisocyanate adducts of the invention. |