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The Influence of Pigment Selection on Particle Size and Migration Stability in Aqueous Inkjet Inks

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The aqueous pigmented inkjet ink formulator is faced with a large number of potential commercially available grades of organic pigment. This paper presents data that explores the link between the properties of some commercially available organic pigments and (i) the particle size achievable in dispersed form and (ii) the subsequent effects on the stability of the dispersion to particle migration. Different grades of the same organic pigments from several manufacturers were dispersed under equivalent conditions and particle sized using Photon Correlation spectroscopy. Ink jet inks were formulated from these dispersions and the propensity to settling was measured using a Turbiscan stability analyser. The results show a clear correlation between rate of sedimentation and particle size. The effects of particle size are less pronounced as ink viscosity increases. Correlation with the available physical parameters of the pigment powder is not always clear, however the study shows the importance of selection of the appropriate grade of pigment in optimising the achievable particle size. Examples are shown that illustrate the colouristic advantages of reduced particle size.
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Document Type: Research Article

Publication date: 2003-01-01

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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