POLYISOCYANATES CONTAINING URETIDIONE AND ALLOPHANATE GROUPS

摘要

Disclosed herein is a liquid, monoallophanate-containing, monouretidione- containing polyisocyanate composition characterized by having (i) an isocyanate functionality of between 2.8 and 6.5, (ii) a free N CO content of 10 % to 47 % by weight, (iii) a viscosity of less than 1000 cp, and (iv) the presence of monouretidione and monoallophanate groups in a molar ratio of said monouretidione groups to said monoallophanate groups of between about 20:1 and about 1:5. Also disclosed i s a process for producing the above compositions, as well as their use, optionally in blocked form in one or two component coating compositions.