Melting-reactive dyes for mass coloration of synthetic fibres¯¯part I: perylene3,4,9,10-tetracarboxylic acid dianhydride in poly(ethyleneterephthalate)

Mass coloration of poly(ethyleneterephthalate) (PET) by using a melt-reacting dye is described, and affords an economical favorable and environmentally friendly method of coloration. Perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTAD) was used as a melting-reactive dye in poly(ethyleneterephthalate) and showed high thermal stability. A chainextending reaction was confirmed by UV¯vis and IR spectroscopic analysis. The effect of the proportion of the added PTAD on the intrinsic viscosity of the polymer was studied, and increasing amounts resulted in increased intrinsic viscosity. The higher viscosity is beneficial to the spinning process. The light fastness of the colored fibres was as high as 7.