Water-soluble tris phenyl bisazo dyes for polyamide fibers

Abstract

Disclosed are tris phenyl bisazo dyes bearing one or two sulfated alkoxycarbonyl or sulfated alkylcarbamyl groups. These dyes impart yellow to red shades to fibers, particularly polyamides, and are especially useful for dyeing polyamide (nylon) carpets, generally giving good fastness to light, ozone, oxides of nitrogen, washing, sublimation, crocking, and the like, and having good leveling, exhaustion, build properties, and stability to variations in dyeing condition such as pH and temperature. The present dyes have the general formula: ##STR1## wherein X is --O--, --NH--, --N(alkyl)--, or --N(aryl)--; Z is selected from straight or branched-chain alkylene, and such alkylene containing one or two internal linkages independently selected from ether, amine and amide; M is H, Na, K, or NH.sub.4 ; n is 1 or 2; R.sub.3 is --OH, alkoxy or --NR.sub.8 R.sub.9, wherein R.sub.8 and R.sub.9 are independently selected from H and alkyl and when either R.sub.4 or R.sub.5 is hydroxy or alkoxy ortho to the azo radical, R.sub.3 is further selected from hydrogen, halogen, alkyl, aryl and acylamido; and R, R.sub.1, R.sub.2, R.sub.4, and R.sub.5 are independently selected from hydrogen, halogen, hydroxyl, alkyl, aryl, alkoxy, and acylamido, with the proviso that when R.sub.3 is neither --OH, alkoxy, nor --NR.sub.8 R.sub.9, one of R.sub.4 and R.sub.5 is either hydroxy or alkoxy ortho to the azo radical. These alkyl, alkylene, alkoxy and aryl moieties may be substituted with a wide variety of substituents known to the art.