INHIBITOR FOR THE POLYMERIZATION OF A 2- ISOCYANATOALKYL ESTER OF AN ALPHA, BETA- ETHYLENICALLY UNSATURATED CARBOXYLIC ACID

摘要

-11-ABSTRACT OF THE DISCLOSUREThis invention is directed to a process fordistilling a 2-isocyanatoalkyl ester of an .alpha.,.beta.-ethyleni-cally unsaturated carboxylic acid from a liquid mixture.The invention is characterized by distilling theisocyanatoalkyl ester in the presence of an amount ofgaseous nitrogen oxide effective to inhibit the vinylpolymerization of the isocyanatoalkyl ester. Theformation of a popcorn polymer is inhibited by the useof a nitrogen oxide.28,838-F -11-