Desensitizing ink for the printing of self-copying sheets

Abstract From the Canadian patent

New nucleophilic urethanes are described and claimed which are the reaction product of a monoisocyanate a, diisocyanate or a polyisocyanate with a basic alkoxylated amine whose hydroxyl functionality has been adjusted to a value of 0.5 to 2 by etherification esterification and/or reaction with a monoisocyanate. These compounds are particularly used individually or, as a mixture, as neutralizing nucleophilic compositions in desensitizing inks for the printing by dry or humid offset, typographic, or flexoqraphic methods destined, to locally neutralize the electrophilic layer of a chemical pressure sensitive copying set. The disclosed compounds have a better neutralizing power which allows to …