Magnetic toner, image forming method and process cartridge
First Claim
1. A magnetic toner comprising:
- magnetic toner particles containing at least a binder resin and magnetic iron oxide;
wherein the magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal element selected from the group consisting of Mn, Zn, Ni, Cu, Co, Cr, Cd, Al, Sn and Mg, and 0.2 to 0.8% by weight of silicon element based on an iron element;
the ratio (Bsi /ASi)×
100 of the content BSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 20% by weight to the total content ASi of the silicon element present in the magnetic iron oxide is 45 to 85%;
the ratio (Csi /Asi)×
100 of the content CSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 10% by weight to the total content ASi is 35 to 70%; and
the magnetic toner has a weight average particle diameter of 3.5 to 10.0 μ
m, and contains 0 to 30% by volume of magnetic toner particles having a volume particle diameter of 12.7 μ
m or more determined from a volume distribution.
1 Assignment
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Accused Products
Abstract
A magnetic toner includes magnetic toner particles containing at least a binder resin and a magnetic iron oxide. The magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal element selected from the group consisting of Mn, Zn, Ni, Cu, Co, Cr, Cd, Al, Sn and Mg, and 0.2 to 0.8% by weight of silicon element on the basis of an iron element; the ratio (Bsi /ASi)×100 of the content BSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 20% by weight to the total content ASi of the silicon element present in the magnetic iron oxide is 45 to 85%; the ratio (Csi /ASi)×100 of the content CSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 10% by weight to the total content ASi is 35 to 70%; and the magnetic toner has a weight average particle diameter of 3.5 to 10.0 μm, and contains 0 to 30% by volume of magnetic toner particles having a volume particle diameter of 12.7 μm or more determined from a volume distribution.
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Citations
101 Claims
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1. A magnetic toner comprising:
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magnetic toner particles containing at least a binder resin and magnetic iron oxide; wherein the magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal element selected from the group consisting of Mn, Zn, Ni, Cu, Co, Cr, Cd, Al, Sn and Mg, and 0.2 to 0.8% by weight of silicon element based on an iron element;
the ratio (Bsi /ASi)×
100 of the content BSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 20% by weight to the total content ASi of the silicon element present in the magnetic iron oxide is 45 to 85%;
the ratio (Csi /Asi)×
100 of the content CSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 10% by weight to the total content ASi is 35 to 70%; andthe magnetic toner has a weight average particle diameter of 3.5 to 10.0 μ
m, and contains 0 to 30% by volume of magnetic toner particles having a volume particle diameter of 12.7 μ
m or more determined from a volume distribution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An image forming method comprising the steps of:
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charging an electrostatic latent image holding member for holding an electrostatic latent image; forming an electrostatic latent image on the charged electrostatic latent image holding member; and developing the electrostatic latent image on the electrostatic latent image holding member by a magnetic toner to form a toner image; wherein the magnetic toner comprises magnetic toner particles containing at least a binder resin and magnetic iron oxide; the magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal element selected from the group consisting of Mn, Zn, Ni, Cu, Co, Cr, Cd, Al, Sn and Mg, and 0.2 to 0.8% by weight of silicon element on the basis of an iron element; the ratio (Bsi /ASi)×
100 of the content BSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 20% by weight to the total content ASi of the silicon element present in the magnetic iron oxide is 45 to 85%;the ratio (Csi /ASi)×
100 of the content CSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 10% by weight to the total content ASi is 35 to 70%; andthe magnetic toner has a weight average particle diameter of 3.5 to 10.0 μ
m, and contains 0 to 30% by volume of magnetic toner particles having a volume particle diameter of 12.7 μ
m or more determined from a volume distribution. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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67. A process cartridge detachably mountable on a main assembly of an image forming apparatus comprising:
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an electrostatic latent image holding member for holding an electrostatic latent image; and development means comprising a magnetic toner for developing the electrostatic latent image; wherein the magnetic toner comprises magnetic toner particles containing at least a binder resin and magnetic iron oxide; the magnetic iron oxide contains 0.2 to 4.0% by weight of at least one metal element selected from the group consisting of Mn, Zn, Ni, Cu, Co, Cr, Cd, Al, Sn and Mg, and 0.2 to 0.8% by weight of silicon element on the basis of an iron element; the ratio (Bsi /ASi)×
100 of the content BSi of the silicon element present in the magnetic iron oxide up to an iron element solubility of 20% by weight to the total content ASi of the silicon element present in the magnetic iron oxide is 45 to 85%;the ratio (Csi /ASi)×
100 of the content CSi of silicon element present in the magnetic iron oxide up to an iron element solubility of 10% by weight to the total content ASi is 35 to 70%; andthe magnetic toner has a weight average particle diameter of 3.5 to 10.0 μ
m, and contains 0 to 30% by volume of magnetic toner particles having a volume particle diameter of 12.7 μ
m or more determined from a volume distribution. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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Specification