Patent ID: 7595138

Claim:
A toner comprising an additive and a toner matrix that comprises a binder resin, a colorant, and a wax, wherein the additive contains an inorganic micropowder to whose surface polysiloxane and at least one selected from fatty acids and derivatives thereof are adhered, wherein the at least one selected from fatty acids and derivatives thereof is at least one selected from the following groups (1),(2), (3) and (4): (1) a group of fatty acids consisting of caprylic acid, capric acid, undecylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, montanic acid, lacceric acid, oleic acid, erucic acid, sorbic acid, and linoleic acid; (2) a group of fatty acid esters consisting of a fatty acid pentaerythritol monoester, a fatty acid pentaerythritol triester, and a fatty acid trimethylol propane ester; (3) a group of aliphatic amides consisting of palmitic acid amide, palmitoleic acid amide, stearic acid amide, oleic acid amide, arachidic acid amide, eicosenoic acid amide, behenic acid amide, erucic acid amide, and lignoceric acid amide; and, (4) a group of fatty acid metal salts consisting of salts of at least one fatty acid selected from the group consisting of caprylic acid, capric acid, undecylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, montanic acid, lacceric acid, oleic acid, erucic acid, sorbic acid, and linoleic acid with at least one metal selected from the group consisting of aluminum, zinc, calcium, magnesium, lithium, sodium, lead, and barium, and wherein the inorganic micropowder to whose surface polysiloxane and at least one selected from fatty acids and derivatives thereof are adhered is obtained by the step of: mixing an inorganic micropowder with a solution of the polysiloxane and the at least one selected from fatty acids and derivatives thereof dissolved in an organic solvent and then drying the obtained product.