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US 7,547,498 B2Granted
Toner for developing electrostatic latent images and a production method for the same
AssigneeKonica Minolta Business Technologies, Inc.
InventorsKenji Yamane, Masafumi Uchida, Yasuko Yamauchi
Life of this patent
Estimating the term…
Abstract
A toner for developing electrostatic images which contains an external additive A containing an irregular-shaped metal oxide and having an average value of the feret's horizontal diameter of from 20 nm to 1370 nm, and an external additive B containing a hydrophobic particle having an average value of the feret's horizontal diameter of from 10 nm to 45 nm.
Claims14
A toner for developing electrostatic images comprising:
- an external additive particle having a diameter of primary particle of from 25 nm to 1450 nm and a true density of from 2.5 g/cm3 to 4.8 g/cm3, the external additive particle has a core portion of silica, titania or alumina and the surface of the external additive contains an amorphous silica area and a metal oxide area;,
- wherein the toner contains a toner particle and the toner particle is produced by a process for fixing a resin particle on a mother particle and a glass transition point of the resin particle (Tgs) is higher than a glass transition point of the mother particle (Tgm).
Dependencies are inferred from the claim text.