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Molecular Structures of Colored Forms of Leuco Dye Colored by Phenolic Developers and the Correlation with Decolorable Toner Properties

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Although the recording system of the leuco dye and phenolic color developer has been employed in practical applications, the basis of colorless-to-coloring thermochromism had not been investigated, which prevented us from controlling the system. We have succeeded in isolating the six colored forms of a leuco dye colored by phenolic color developers and clarified the molecular structures by X-ray crystallography for the first time. It has been revealed that a leuco dye and phenolic developers combined with each other by the hydrogen bond between carboxylate moiety of a leuco dye and OH groups of developers. Correlation with decolorable toner properties and colored-form structures has been revealed; coloring property increases with an increase in the number of hydrogen bonds in colored forms, and erasing property increases with elongating hydrogen bond distance between the leuco dye and developers. Also, a feature of colored forms for toner with both high coloring and erasing properties has been suggested; expansion of hydrogen bond network between colored forms by relatively weak hydrogen bond.

Document Type: Research Article

Publication date: 2008-01-01

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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