Reaction of Aryl Isocyanates With Cotton Cellulose

Abstract

Eleven N-arylcarbamylated celluloses were prepared by a pad-cure treatment of cotton with phenyl N-arylcarbamates as isocyanate generators. Add-ons up to 8.5% were obtained by impregnating the fabric with a dimethylformamide (DMF) solution of the phenyl carbamate and curing at 180-200°C for 4-5 min. The extent and efficiencies of these cotton cellulose reactions were observed by means of add-ons, nitrogen contents, and change in pickup of acid dyes. The activating aryl substituents were dialkylamino, methoxyl, methylthio, and methyl electron-donating (+E) groups. N-pyridylcarbamates were also used. The modified cotton fabrics exhibited improved rot resistance and those containing amine groups had ion-exchange properties.