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A Novel Pigment Dispersant and Surfactant For Radiation Curable Waterborne Ink Jet Inks

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Abstract:

The development of waterborne radiation curable ink formulations for ink jet applications is challenged by the need for hydrolytic stability. Most conventional waterborne inks are formulated in the basic pH range (pH ≥ 8). In this case, stable waterborne pigment dispersions are formulated with conventional anionic and nonionic pigment dispersants. However, if these same dispersions are used in combination with water-soluble acrylate monomers and oligomers, the basic pH often causes hydrolysis of the acrylic esters. The result is a decrease in pH, changes in viscosity, and poor overall stability. Conversely, if the basic pigment dispersions are added to the acid stable radiation curable monomer and oligomers, the dispersions become unstable, resulting in pigment flocculation and changes in viscosity. To address this dilemma, a novel radiation curable pigment dispersant and a co-functioning surfactant are introduced that yield acid stable pigment dispersions that remain stable when added to the water-soluble acrylate monomers and oligomers. The utilization of these additives is demonstrated in red, yellow, blue and black waterborne radiation curable ink jet formulations.

Document Type: Research Article

Publication date: January 1, 2003

More about this publication?
  • 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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