| abstract |
The present invention relates to blocked polyisocyanates which are the reaction product of polyisocyanate resins prepared from HDI and containing iminooxadiazinedione groups in an amount of at least 20 mol %, based on the total moles of iminooxadiazinedione and isocyanurate groups, with alcohols of formula (I) n ROH (I), n wherein n R represents aliphatic, straight chain or branched, optionally cyclic, optionally substituted (O—R 1 , NR 1 2 ), C 1 -C 6 radicals, preferably C 1 -C 4 radicals, and n R 1 has the same meaning as R. n The present invention also relates to a process for the preparation of blocked polyisocyanates and to their use for the preparation of polyurethane plastics and coatings, preferably for coating substrates. |