| abstract |
The invention refers to a process of colour protection of dyed textile goods to the attack by peroxides, either due to industrial bleaching or peroxide application in the washing machine, such as occurs when the textiles are prebleached or washed with detergents that contain peroxides such as perborates and percarbonates. The most sensitive dyes are reactive and sulphur dyes for cotton. Some dyes belonging to these classes lose colour strength and alter their hue. In this invention a new process of colour protection for dyed goods is revealed, by the application of quenchers, which when applied simultaneously with the peroxide, inhibit the peroxide attack on the dyes present in the textile fibres. The products claimed in this invention to work as efficient quenchers and colour protectors are ascorbic acid, DABCO or 1,4-diaza-2,2,2-biciclooctane and diphenylamine. |