Disperse Dyes Incorporating N–Substituted Carbamate Groups for Transfer Printing of Natural Fibres

Abstract

Disperse dyes of both azo and anthraquinone types containing N–substituted carbamate groups as ‘masked’ isocyanate reactive groups have been synthesised. These dyes have been found to behave like reactive dyes containing free isocyanate groups, when employed for transfer printing of natural fibres. The N–substituted carbamate group in these dyes readily regenerates the isocyanate group during transfer printing, which in turn reacts with amino groups in wool or hydroxy! groups in cellulose. These dyes have, therefore, shown high transferability and fixation on natural fibres.