REACTION OF CARBOXYLIC DYES WITH WOOL AND POLYAMIDE - PART III - EFFECT OF THE ACTIVATING AGENT

Dyes containing a carboxylic acid group had been shown to react with w ool and polyamide fibres when activated with ethyl chloroformate (Part s I and II). One of the dyes, 3-aminobenzoic acid -->N,N-dimethylanili ne, was, in this work, activated with other chlorofirmates, so as to i mprove the dyeing conditions. Benzyl chloroformate was found to be a g ood substitute since it is not as volatile as ethyl chloroformate, whi ch suggests that it will be easier to apply in practical dyeing condit ions. The yield of the reaction with cyclohexylamine is similar to the one obtained with ethyl chloroformate, suggesting that the fixation o f the dye on wool or polyamide will be much the same. The fastness res ults are also equivalent. (C) 1998 Elsevier Science Ltd.