Aftertreatment of acid dyes on conventional nylon 6.6 with a commercial syntan/cation system. Part 3: Improvements to the Fixogene AC system

Dyeings (1% owf) were produced on conventional nylon 6.6 fabric using two commercial nonmetallised acid dyes. The fastness of the dyeings to the ISO 105:CO6/C2 wash test over five repetitions was determined. Aftertreatment of the dyeings using a commercial syntan alone improved the wash fastness after five washes, with respect to the non-aftertreated sample, whereas the sequential application of a cationic compound to the syntanned dyeings imparted a further improvement in wash fastness. Yet further improvements to the system could be achieved by varying the cationic agent, the amount of cationic agent applied and the pH of the application system.