| abstract |
The present invention is directed to a polyisocyanate mixture ni) having an NCO content of 5 to 35% by weight and a monomeric diisocyanate content of less than 3% by weight, and prepared from a polyisocyanate adduct, nii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane groups and niii) containing fluorine (calculated as F, AW 19) in an amount of 0.001 to 50% by weight, n nwherein the preceding percentages are based on the solids content of the polyisocyanate mixture and wherein fluorine is incorporated by reacting an isocyanate group with a compound containing two or more carbon atoms, one or more hydroxyl groups and one or more fluorine atoms. n The present invention is also directed to a process for the production of this polyisocyanate mixture and to its use, optionally in blocked form, as an isocyanate component in one- or two-component coating compositions. |