Metal salts of beta-diketones as charging additives: a mechanistic study

Gregg A. Lane

doi:10.1117/12.19799

1 July 1990 Metal salts of beta-diketones as charging additives: a mechanistic study

Gregg A. Lane

Proceedings Volume 1253, Hard Copy and Printing Materials, Media, and Processes; (1990) https://doi.org/10.1117/12.19799
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

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.

Citation Download Citation

Gregg A. Lane "Metal salts of beta-diketones as charging additives: a mechanistic study", Proc. SPIE 1253, Hard Copy and Printing Materials, Media, and Processes, (1 July 1990); https://doi.org/10.1117/12.19799

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