Abstract: Quaternized azo dyes made by coupling an appropriate diazotized benzenoid base with an N-dialkylaminoalkylene [.alpha.(N-alkylanilino)] m- or p-toluenesulfonamide. Quaternization of the pendant dialkylamino group of the coupling component is carried out before or after coupling. The water soluble quaternary azo dyes are especially useful for coloring acrylic fibers.

Abstract: Water insoluble disperse dyes for aromatic polyester textile material are made by the reaction of an aldehyde intermediate derived from an .alpha.-(N-alkylanilino)m-toluenesulfonamide, typified by .alpha.-(N-ethylanilino)-m-toluenesulfonamide, with a nitrile containing an active methylene group, such as malononitrile. This class of dyes, when appropriately dispersed, produces bright greenish-yellow dyeings on aromatic polyester fabrics with excellent substantivity, outstanding sublimation fastness, and excellent fastness to light. The dyes are applied to polyesters, such as polyethylene terephthalate, by carrier dyeing, pressure dyeing and thermofixation methods.

Abstract: Azo dyes for dyeing polyester fabric are made by coupling an appropriate diazotized amino heterocyclic base into an .alpha.-(N-alkylanilino)-m-toluene sulfonamide, typified by .alpha.-(N-ethyl anilino)-m-toluene sulfonamide. This class of azo dye, when appropriately dispersed, produces dyeings on aromatic polyester fabrics with excellent substantivity, outstanding sublimation fastness, and good fastness to light. The dyes are applied to polyesters, such as polyethylene terephthalate, by carrier dyeing, pressure dyeing, and thermofixation methods.

Abstract: Polyester fibers, particularly poly(ethylene terephthalate), is dyed in bright, fast shades with p,p'"-dihydroxytrisazo compounds.