STABLE DISPERSE DYESTUFF AND ITS USE FOR THE DYEING OF SYNTHETIC AND HALF-SYNTHETIC FIBRES

摘要

By the slow stepwise heating up of an aqueous suspension of the crystallographically amorphous dye of the formula IMAGE which dye is unstable to dyeing, to a temperature of 90 DEG -100 DEG C. with a halting point at 40 DEG -60 DEG C., this dye can be transformed completely into the crystalline alpha -modification. The novel dye modification can be easily converted, without increase of viscosity, into thinly liquid formulations which are readily pourable, which form no sediment, and which are excellently suitable for producing printing pastes, for example for printing polyester fabric.