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Aftertreatment of 1:2 Metal Complex Acid Dyes on Conventional and Microfibre Nylon 6.6 with a Commercial Syntan/cation System

Dyeing (2 % owf) were produced on conventional and microfiber nylon 6.6 fabrics using unsulphonated, monosulphonated and disulphonated 1:2 metal complex acid dyes. When subjected to the ISO 105:C06/C2 wash test, the wash fastness behaviour of the dyeings was related to the degree of sulphonation of the dyes. Aftertreatment of the dyeings using a commercial syntan improved the wash fastness of the dyeings whereas the sequential application of a cationic compound to the syntanned dyeings caused further improvement in wash fastness

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