Magnetic black toner for electrophotography, magnetic two-component developer for electrophotography containing the same, image forming apparatus, and image forming method

A magnetic two-component developer for electrophotography comprising a toner and a carrier, wherein the toner comprising a binder resin, a magnetic substance, and a pigment, wherein the pigment is at least one of phthalocyanine pigment and Mn containing hematite, and the content ratio of the magnetic substance and the pigment in the toner satisfy the following formulae:

• 10≦A≦30, 0.1≦B≦3, and 5≦C≦40, wherein A denotes the content ratio (mass %) of the magnetic substance in the toner, B denotes the content ratio (mass %) of the phthalocyanine pigment in the toner, and C denotes the content ratio (mass %) of the Mn containing hematite in the toner.

An image forming apparatus comprising a developing unit for developing a electrostatic latent image with a toner to form a toner image, a transfer unit for transferring the toner image onto a recording medium, and a fusing unit for fusing the toner image onto the recording medium, wherein the toner comprising a binder resin, a magnetic substance, and a pigment, wherein the pigment is at least one of phthalocyanine pigment and Mn containing hematite, and the content ratio of the magnetic substance and the pigment in the toner satisfy the following formulae:

• 10≦A≦30, 0.1≦B≦3, and 5≦C≦40, wherein A denotes the content ratio (mass %) of the magnetic substance in the toner, B denotes the content ratio (mass %) of the phthalocyanine pigment in the toner, and C denotes the content ratio (mass %) of the Mn containing hematite in the toner.

An image forming method including a developing process that develops a electrostatic latent image with a toner to form a toner image, a transfer process that transfers the toner image onto a recording medium, and a fusing process that fuses the toner image onto the recording medium, wherein the toner comprising a binder resin, a magnetic substance, and a pigment, wherein the pigment is at least one of phthalocyanine pigment and Mn containing hematite, and the content ratio of the magnetic substance and the pigment in the toner satisfy the following formulae:

• 10≦A≦30, 0.1≦B≦3, and 5≦C≦40, wherein A denotes the content ratio (mass %) of the magnetic substance in the toner, B denotes the content ratio (mass %) of the phthalocyanine pigment in the toner, and C denotes the content ratio (mass %) of the Mn containing hematite in the toner.