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Proceedings Paper

Metal salts of beta-diketones as charging additives: a mechanistic study
Author(s): Gregg A. Lane
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Paper Abstract

Metal salts of B-diketones such as aluminum acetylacetonate (Al(acac)3) have been found to be potent negative charging additives for liquid electrostatic toners when used in conjunction with surfactant "charge directors". This paper describes the use of these additives and efforts to uncover the mechanism of charging for toners when these salts are used in conjunction with acidic resins. Although pigment interactions were not studied, when pigments were included in the toners the charging results were comparable. Charging of particles in liquid electrostatic toners is not yet fully understood. Fowkes and coworkers have demonstrated that proton exchange is the operative mechanism in charging of carbon black particles in hydrocarbon 1 Results are presented here for a system which does not appear to be charging by an acid/base mechanism. Charging in this system was found to be dependent on the presence of surface ionic species. The chemical nature of these species suggests that charging may be taking place by partitioning of surface ions into surfactant inverse micelles.

Paper Details

Date Published: 1 July 1990
PDF: 8 pages
Proc. SPIE 1253, Hard Copy and Printing Materials, Media, and Processes, (1 July 1990); doi: 10.1117/12.19799
Show Author Affiliations
Gregg A. Lane, DX Imaging (United States)

Published in SPIE Proceedings Vol. 1253:
Hard Copy and Printing Materials, Media, and Processes
Joseph Gaynor, Editor(s)

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