Use of siloxanes to increase dye fastness on leather

Amino-functionalised siloxanes have been used to increase the number of act ive sites in leather (and especially suede) available for dye fixation. The use of a second hydrophobic siloxane in conjunction with the amino-functio nalised siloxane, further increases the fastness results. The best results are found for the use of reactive dyes on siloxane pre-treated leather samp les, where washfastness and perspiration fastness results of 4-5 or 5 for a ll fibres on a multifibre staining material for a commercially acceptable b lack are obtained. Wet and dry crock fastness of 3 is reached.