Relations between some Physicochemical Properties of Reactive Dyes and their Behaviour in Padding Processes

Meetings of the Scottish Region, held in the St Enoch Hotel, Glasgow, on 16th February 1965, Mr B. W. Mills in the chair; and of the Manchester Region, held at the Manchester Literary and Philosophical Society on 18th February 1965, Mr F. V. Davis in the chair Experimental results are presented which show that the members of any given range of reactive dyes have a diffusion coefficientDand an exhaustion valueEwhich are roughly in inverse proportion to each other. Metal–complex dyes (1: 1 and 1: 2) and phthalocyanine metal complexes, however, show characteristic deviations in behaviour. The significance ofDandEin the padding, intermediate drying, and fixation of reactive dyes is elucidated. The theory of the padding process is discussed and the relationships betweenDandEand the ending behaviour are demonstrated. A new test for assessing the tendency to ending is described.