Toner and method for producing the same, and two-component type developer
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United States of America Patent
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Sep 16, 2014
Grant Date -
Apr 25, 2013
app pub date -
Oct 15, 2012
filing date -
Oct 19, 2011
priority date (Note) -
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Abstract
A toner containing toner base particles and an external additive, wherein regions with different tribocharging polarities with respect to a magnetic carrier are present in a domain-matrix structure on the surface of the toner base particles. The island region B has a predetermined height, the external additive has a reverse polarity to the region B in terms of tribocharging polarity to the magnetic carrier, the external additive contains a first external additive having a number-average primary particle size of 80-150 nm and a second external additive having a number-average primary particle size of 10-60 nm, and an average coverage Cb (%) with the first external additive in the region B is 27-100% and a coverage Ca (%) with the first external additive in the sea region A is 12% or less.
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