New black dye for inkjet ink application

Abstract

There are certain performance requirements placed on dye-based colorants for inkjet ink applic ations. These include high color strength and bright shade, long-term storage stability, and high light fastness. Moreover, metal-free derivatives are preferable from an environmental standpoint. Reactive dyes are intrinsically bright, with moderate fastness properties and are less harmful to human. However, this type of dye has poor long-term storage stability, owing to reactive group hydrolysis. This reaction causes dye precipitation, leading to clogging and damage to print head and shade changes problems.In this paper, a modified black dye is discussed. It is derived from Everzol® Black GSP, and demonstrates improved storage stability and color strength. In addition, it is metal-free and resulting prints display improved light fastness. This dye is readily soluble and aqueous solutions shows good printing performance.