Molecular Design for Coloring/Decoloring Properties in Rewritable Paper Using Leuco Dyes: Effects of Long-chain Alkyl Group

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Printing systems with an information-display function are attracting increasing interest as greater volumes of information become available in digital format. We recently developed a practical rewritable printing system for displaying documents in which the coloring-decoloring reaction cycles are thermally controlled using leuco dyes. This system is composed of leuco dye molecules and acidic developer molecules with long-chain alkyl groups and associative groups; it exhibits colored/decolored states that can be reversed by varying the heat conditions. Since the reversibility property mainly depends on the molecular structure of the developer, we prepared simple developers with different alkyl lengths to investigate the structural effects. We found that controlling the physical properties of the long-chain alkyl group of the developer is the key to achieving both thermal stability of the colored state and rapid erasability.

Document Type: Research Article

Publication date: January 1, 2005

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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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