The light stability of azo dyes and azo dyeings I. Light Stability of Dyeings with Reactive and Non-reactive Derivatives, Respectively, of Two Selected Azochromophores

Zs Csepregi, P. Aranyosi, I. Rusznák, L. Töke, J. Frankl, A. Víg

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The light stability of RC-dyed (conventional reactive dyeing) and N-dyed (substantive dyed without subsequent rinsing) cotton fabric dyeings produced with the members of two groups of dyes, viz., 'A'-dye and 'B'-dye groups, respectively, have been studied. The best light stability was achieved in the 'A'-dye group on the sample RC-dyed with A(MCT-VS). N-ethyl substitution on the NH-bridge between the two reactive groups (A(MCT-VS)Et,RC) did not improve the fastness, whereas methoxy substitution on the diazo component (A(MCT-VS)Met,RC) deteriorated the light stability. No detectable difference could be observed in the light stability of RC-dyeings with A(MHT-VS) and A(MCT-VH), but the values achieved were not as good as that obtained with the original bifunctional variety (A(MCT-VS)RC). The light stability of all the RC- or N-dyeings produced with reactive group containing members of the 'A'-group were better than those of N-dyeings produced with A(Chr) and A(MHT-VH), respectively. All the RC- and N-dyeings (except B(Chr)N) of the 'B'-group had identical light stability. No explanation could be found for the good light stability of the B(MHT-VH)N dyeing. RC-dyeings within the 'A'-group are more stable to light than those within the 'B'-group, equatable to the difference in the light stability of the respective chromophores.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalDyes and Pigments
Issue number1
Publication statusPublished - Apr 2 1998



  • Azodyeing
  • Chromophore effect
  • Dye-fibre bonds
  • Light fastness

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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