External additive for toner and method for producing the same

G - Physics – 03 – G

Patent

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G03G 9/08 (2006.01)

Patent

CA 2637915

A barium titanate external additive for toner that when blended in especially a color toner, enhances the toner fluidity, electrical properties and other relevant performance, and that in a printer making use of the toner, simultaneously realizes high image density and reduced background fog and retains high image quality even in high temperature high humidity and low temperature low humidity environments. Further, there is provided an industrially advantageous process for producing the same. The external additive for toner is characterized by consisting of a spherical barium titanate having undergone coating treatment with a hydrophobicizing agent.

L'invention concerne un additif externe à base de titanate de baryum pour toner qui, lorsqu'il est mélangé à, en particulier, un toner couleur, améliore la fluidité, les propriétés électriques et autres performances pertinentes du toner, et qui dans une imprimante utilisant ledit toner, permet d'obtenir une densité d'image élevée et un voile de fond réduit et permet de conserver une qualité d'image élevée même dans des environnements à température élevée et humidité élevée et à température faible et humidité faible. L'invention concerne en outre un procédé industriellement avantageux de production dudit additif. L'additif externe pour toner est caractérisé en ce qu'il est constitué d'un titanate de baryum sphérique ayant subi un traitement de revêtement à l'aide d'un agent hydrophobisant.

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