The dyeing of natural fibres with reactive disperse dyes in supercritical carbon dioxide

This paper describes the dyeing of natural and man-made fibres, in supercritical carbon dioxide, with C.I. Disperse Yellow 23 modified with 2-bromoacrylic acid and 1,3,5-trichloro-2,4,6-triazine as reactive groups. Cotton was dyed using these reactive disperse dyes without any pre-treatment of the fibre; on wool and silk, the colour depth was higher than on cotton. The wash, rub and light fastness of all dyeings was rated at between 4 and 5. A polyester/cotton-fibre blend was also dyed in a one step process.