Abstract
Three dimeric-triphenylmethane dyes were designed and synthesised for enhancing the rigidity of triphenylmethane moiety and three water-soluble dyes were prepared from them in order to manufacture water-based inks for high-speed ink-jet printing technology. The geometrical characteristics of the synthesised dyes were investigated by carrying out density functional theory calculations. Because of their highly twisted chemical structures and hydrophilic substituents, the synthesised dyes showed efficiently enhanced water solubility when formulated into water-based inks. All the prepared dyes exhibited superior molar extinction coefficients and photo stability than the commercially available acid blue dye. The prepared water-based inks showed the excellent long-term storage stability by optimising the physical and rheological properties of the inks. Moreover, they exhibited good ejection performance and well-ordered pattern arrays when applied to high-speed inkjet printing tests.
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