Dyes derived from aminothiophenes .3. Application of some disperse dyes derived from 2-aminothiophenes to hydrophobic fibres

A series of thienyl-2-azo dyes has been milled and the dispersions applied to polyester, nylon and cellulose diacetate by conventional exhaustion dyeing techniques. The colour properties of the dyeings were examined and related to the molecular structure of the colorants. Generally, of the three substrates, polyester was found to be coloured most effectively, the nylon and acetate dyeings had lower colour yields. Although the dyeings were not of standard depth, correlations between dye structure and wash, perspiration and sublimation fastness were identified. Photostability was observed to improve as electron-withdrawing groups were attached to the thiophene ring. (C) 1997 Elsevier Science Ltd.