Patent ID: 7368211
Filing Date: 2008-05-06
Classification: G03G

Abstract:
1. A magnetic toner comprising magnetic toner particles containing at least a binder resin and magnetic material particles each containing a titanium compound, wherein: I) a ratio A [mass %] of a mass of moisture adsorbed to the magnetic material particles to a total mass of the magnetic material particles at a temperature of 28° C. and at a relative vapor pressure of 50% is 0.25 to 0.80 [mass %]; II) a difference at an arbitrary relative vapor pressure between a mass of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure at a temperature of 28° C. and a mass of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure at the same temperature is 0.10 mass % or less based on the total mass of the magnetic material particles; and III) a ratio B [mass %] of a mass of the titanium compound in TiO