Syntheses of bisazo reactive dyes based on 6,6' -methylene-bis-anthranilic acid and their application on various fibres

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:calibri;mso-bidi-theme-font:minor-latin;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Ten bisazo reactive dyes <b>(VIIa-j)</b> have been prepared by coupling diazotised 6,6'-methylene-bis anthranilic acid <b>(III)</b> with various anilino cyanurated coupling components, viz. anilino cyanurated H-acid, Schaffer acid, G-acid, I-acid, K-acid, Tobias acid, N-phenyl J-acid, N-methyl J-acid, Gamma acid and R-acid <b>(VIa-j)</b>, and their dyeing performance on viscose rayon, wool and silk fibres has been assessed. All the dyes gave a wide range of brown to blue shades with very good depth and levelness on each fibre. The purity of <b>VIIa-j</b> was checked by thin layer chromatography. The IR spectra showed all characteristic bands. The percentage dye-bath exhaustion on different fibres was reasonably good and acceptable. The dyed fibres showed fair to very good fastness to light, washing and rubbing.</span>