PROCESS FOR THE PRODUCTION OF ORGANIC POLYISOCYANATES CONTAINING AT LEAST PARTLY BLOCKED ISOCYANATE GROUPS, THE COMPOUNDS OBTAINABLE BY THIS PROCESS AND THEIR USE IN THE PRODUCTION OF POLYURETHANES, STOVING LAQUERS OR AQUEOUS POLYISOCYANATE SOLUTIONS OR DISPERSIONS

摘要

A PROCESS FOR THE PRODUCTION OF ORGANICPOLYISOCYANATES CONTAINING AT LEAST PARTLYBLOCKED ISOCYANATE GROUPS, THE COMPOUNDS OBTAINABLEBY THIS PROCESS AND THEIR USE IN THE PRODUCTIONOF POLYURETHANES, STOVING LACQUERS OR AQUEOUSPOLYISOCYANATE SOLUTIONS OR DISPERSIONSABSTRACT OF THE DISCLOSUREThe present invention relates to a process forthe production of organic polyisocyanates containing atleast partly blocked isocyanate groups characterized inthat specific cyclic dicarbonyl compounds are used asthe blocking agent. The present invention also relatesto the polyisocyanates containing at least partlyblocked isocyanate groups obtainable by this processand to the use of the polyisocyanates containing atleast partly blocked isocyanate groups obtainable bythis process as reactants for isocyanate-reactivecompounds for the production of isocyanate polyadditionproducts.The present invention also relates to the useof polyisocyanates containing at least partly blockedisocyanate groups obtainable by the above process forthe production of aqueous stoving lacquers and to theuse of these polyisocyanates for the production ofaqueous polyisocyanate solutions or dispersions. Theaqueous stoving lacquers and aqueous polyisocyanatesolutions or dispersions are mixed with water in thepresence of a base used in a quantity which issufficient to guarantee the solubility ordispersibility of the polyisocyanates.