| 摘要 |
<p>Organic polyisocyanates having at least two isocyanate groups blocked with CH-azide cyclic ketones have a blocked isocyanate group content (calculated as NCO) of 0.1-20 wt.%. Organic polyisocyanates (I) having at least two isocyanate groups blocked with CH-azide cyclic ketones of formula (1) have a blocked isocyanate group content (calculated as NCO) of 0.1-20 wt.%. X = electron withdrawing group; R1,R2 = H, 1-20C (cyclo)alkyl, 6-24C aryl, 1-20C (cyclo)alkylester or amide, 6-24C aryl ester or amide, mixed 1-24C aliphatic/aromatic groups or a portion of a 4-8 membered ring; and n = 0-5 Independent claims are also included for: (1) a process for the production of organic polyisocyanates (I) by reaction in the presence of a catalyst, whereby 0.8-1.2 moles of the cyclic ketone of formula (1) are added per isocyanate group equivalent; (2) polyurethane resin lacquers containing organic polyisocyanates (I); and (3) coatings containing organic polyisocyanates (I).</p> |
