Synthesis Of Novel Dispersants And Their Application In Pigments Dispersing

With the advance of printing technology, especially the emerging of high-speed printer, ink properties, such as high pigment loading, low viscosity, high color strength are desirable. In order to achieve high performance ink, multi-functional novel dispersants have been developed and commercialized.New structures and synthetic methods of fatty amine derivatives and poly (alkylene oxide) amine derivatives have been investigated in this paper. Mannich reaction has been employed for synthesis of such novel dispersants. Fatty amine derivatives were made from 2,3 acid (2-hydro-3-naphtalenecarboxylic acid), paraformaldehyde and fatty amine. Poly (alkylene oxide) amine derivatives were synthesized from DMSS(dimethyl succinylsuccinate), paraformaldehyde and poly (alkylene oxide) amine, including carboxylic acid as catalyst. The structure of such new dispersants has been confirmed by their infrared spectrum and ~1H NMR.Fatty amine derivatives, as dispersant, have been successfully synthesized and incorporated into offset ink formulated by highly rosinated pigment red 57:1 or pigment yellow 13 according to this paper. Poly (alkylene oxide) amine derivatives have been synthesized and applied to both the water based inks containing PR57: 1 as colorants and to the solvent based inks containing PY83. The results have demonstrated that the inclusion of the fatty amine derivatives can greatly improve the dispersibility of highly rosinated pigments and hence increase their color strength. The poly (alkylene oxide) amine derivatives have also showed great improvement in both water-based and solvent-based inks.Based on pigment derivatives, some commercial dispersants, for example, the dispersants derived from diarylide pigment and pathalocyanine pigments have color so the pigments to which they can be applied must be specified. However, the dispersants invented in this paper are colorless and can be used in many different types of pigments.