Comparison of Fixation Characteristics of New Acid Fixing Reactive Dyes Derived from 5,10 -Phenophosphazine Ring with Commercial Reactive Dyes on Nylon 66 and Wool Substrates

729-733The traditional alkaline reactive dyes were found unsuitable for the continuous dyeing of the polyester/cotton blends. This and other problems lead to the search for the acid fixing reactive dyes. Calcobond and Procion T dyes were thus introduced. However, these series of dyes have suffered diminishing acceptability because of the expensive application conditions. Dyes derived from the 5,10- phenophosphazine ring were accidentally found to form covalent bonds with cellulose at neutral pH earlier. This report ex tends application of these groups of dyes to wool and nylon substrates. The effect of pH on exhaustion and fixation was investigated. The kinetics of dyeing was also studied and compared with some commercial alkaline fixing reactive dyes. The dyes have been established to be acid fixing on wool and nylon. A reaction mechanism has also been proposed