| abstract |
Orange to violet biscationic azo dyes having the formula WHERE R1 alkyl R2 alkyl or hydroxyalkyl R3 alkyl, hydroxyalkyl or benzyl OR R2 and R3 together alicyclic ring OR R1, R2, and R3 together pyridinium ring R4 H or Cl W 1,4-naphthylene or R5 and R6 H, alkyl, alkoxy or Cl R7 H, alkyl, alkoxy, Cl, NHCO alkyl or NHCOC6H5 R8 H, Cl, alkyl or alkoxy Y N R9R2R3 or NHCOCH2N R9R2R3, where R9 R1 or H m 0 or 1 N 0 OR 1 Z H when n O and OH when n 1 A anion AND WHERE ALKYL GROUPS CONTAIN 1-4 CARBON ATOMS, ARE PARTICULARLY WELL SUITED FOR DYEING OF BULK CONTINUOUS FILAMENT (BCF) nylon styling carpet, and have good exhaust and lightfastness on acid-modified nylon and excellent reserve on unmodified nylons, at the preferred dyeing pH range of 6-6.5. The dyes are prepared by coupling p-aminophenacylammonium or p-(paminophenylazo)phenacylammonium salts to N,N-disubstituted anilines containing a pendant tertiary amine or quaternary ammonium group attached to the nitrogen atom. |