Charge Controlling Agent and Toner Using Metal Compound of Cyclic Phenol Sulfide
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
May 8, 2009
filing date -
May 9, 2008
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Abstract
The present invention discloses a charge control agent which comprises a metal compound of a cyclic phenol sulfide of the following formula (1) as an active ingredient: ##STR00001## wherein at least one of several Y is a metal atom. The present invention also discloses a toner which comprises one or more kinds of said metal compound, a coloring agent and a binder resin. The charge control agent of the present invention overcomes disadvantages such as lack of sharpness of first copied images and instability of the quality of the copied images in continuously copying, and it is those applicable to recent high speed printers, which have a quick charging rise time, an excellent environmental stability since the charge amount thereof less varies depending on the changes of temperature and humidity, and a high frictional charge amount. In addition, by using said charge control agent, a toner having a negative electric with high charging performance can be provided.
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