Process for the coloration of thermoplastic polymers and polycondensates

Abstract

For coloring in the mass and spin dyeing water-insoluble thermoplastic polymers and polycondensates, especially polyesters, nickel complex disazomethine compounds are used consisting of 2 molecules of 2-hydroxy-naphthaldehyde possibly substituted in 6-position by halogen, cyano, carboxy, a carboxylic acid alkyl ester or an optionally substituted carboxylic acid amide group, and 1 molecule of an o-phenylene diamine possibly substituted in 4 and 5-position by non-ionic substituents, the nickel atoms being bound in complex manner to the nitrogen atoms of the phenylene diamine and the oxyen atoms of the hydroxynaphthaldehyde. Disazomethine compounds in which the phenylene diamine radical is unsubstituted if the hydroxynaphthaldehyde radical is not substituted in 6-position are excluded. The coloring compounds can be added to the polymeric material without previous dispersion. They dissolved in said material in molecular disperse form so that generally brilliant and clear colorations are obtained. In spin dyeing the filaments substantially retain their high strength and drawing properties; abrasion and clogging of the nozzles or filters do not occur. The colorations are distinguished by a high color strength as well as by high fastnesses to light and to weather and by a good stability in thermofixation.