Synthesis and dyeing characteristics of 3-amino- 1-arylazo-2- naphthols and 2-amino-1-arylazo-3-naphthols

138-140<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" new="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Eight monoazo disperse dyes, 3-amino-1-arylazo-2-napthols and 2-amino-1-arylazo-3-napthols, were prepared by coupling 3-amino-2-napthol with substituted phenyl diazonium salts in alkaline and acidic conditions and their dyeing performance on polyester and polyamide fibres was assessed. The dyeings had red, red brown, red violet and blue violet shades on polyster and red, red brown and red violet shades on polyamide. The dyes showed good pick-up, poor to good light fastness, moderate to good sublimation fastness, poor to moderate perspiration fastness and excellent rubbing fastness.</span

Synthesis of 2,6-dialkylamino-5-arylazo-3-cyano-4-methylpyridines and their application on synthetic fibres as disperse dyes

132-134<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" new="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Four monoazo disperse dyes, 2,6-dialkylamino-5-arylazo-3-cyano-4-methylpyridines were prepared and their dyeing performance on polyester and polyamide fibres was assessed. The dyeing had bright yellow shades with excellent pick-up and moderate light fastness on both the fibres and moderate sublimation fastness on polyester fibre.</span