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Developing Smear-Free Pigmented Inks for Thermal Ink Jet

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Particulate or pigmented inks for thermal ink jet applications exhibit great print quality, far superior to dye based inks. In this paper, we present a concept for the development of smear-free pigmented inks by imparting polyurethane resin emulsions into ink jet inks. Inks are prepared by the addition of a polyurethane resin emulsion, and wherein the urethane groups can function as a crosslinking site with carboxyl or hydroxyl functionalities on carbon black colorant or other color pigment surfaces, thereby impart the ink smear resistance, film hardness, and humidity resistance. The addition of polyurethane resin emulsions also develops a list of attributes such as high optical density, good latency, excellent light- and waterfastness, superior black MFLEN, good frequency response, and excellent cool curl and showthrough properties.

Polyurethane resin emulsions useful in ink jet applications are prepared by either processes: (1) polymerizing polyester polyol, polyisocyanate and acid in a solvent, followed by dispersing the mixture in water, or (2) an isocyanate terminated prepolymer is prepared in the melt or in an aprotic solvent, and is subsequently chain extended with a diamine in the water phase in the presence of a neutralizing tertiary amine.

Document Type: Research Article

Publication date: January 1, 2000

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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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