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Studies of the Morphology and Tribocharging Properties of Charge Control Agent (CCA)-Modified Silicas Prepared by the Fluidized Bed Spray Method

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The charging and admix behaviors of a series of surface-modified R972 silicas (modified by two positive charge control agents (CCAs) and nine negative CCAs prepared by the fluidized bed spray process (1:10 wt. ratio of CCA to R972) were studied with unpigmented styrene–butadiene toner (∼9 μm). Concurrent to xerographic measurements, the morphologies of the modified silica samples and the resulting toners were examined by TEM and SEM microscopy, respectively. Results showed that when the CCA was homogeneously distributed in the silica sample, it dominated the charging and admix properties of the resulting toner. Because the actual CCA concentration was only 0.05wt%., the observation clearly demonstrated that the approach of using CCA-modified silicas is one of the most effective ways to impart charging in toner. When the CCA was not distributed homogeneously in the silica sample, the toner resin dominated the charging and admix properties. The inefficacy of the CCA in this case is attributable to a surface area effect. The importance of the physical state or the distribution of the CCA in the silica sample was further illustrated in the case of KTPB (potassium tetraphenylborate)-modified silicas. Although the silica sample prepared by the fluidized bed spray process was inhomogeneous, we were able to homogenize the distribution of KTPB in R972 using a solution-coating technique. The solution-coated KTBP/R972 sample not only showed great enhancement in negative tribo (e.g., from ∼27 to ∼95 μC/g), it also reduced the admix time from 15 to 2 min
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Document Type: Research Article

Publication date: September 1, 1998

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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    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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