Magnetic carrier, two-component developer, replenishing developer, and method of forming image

A two-component developer comprising:

• a magnetic carrier;
• and
• a toner,
• wherein the magnetic carrier comprises:
• a magnetic particle;
• and
• a coating layer disposed on a surface of the magnetic particle,
• wherein the coating layer comprises at least a resin component containing approximately 70 wt % or more of a polymer comprising an acrylic monomer CA as a component and hydrotalcite CH dispersed in a form of particles having a number-average particle diameter ranging from approximately 0.1 μm or more to approximately 0.6 μm or less,
• a content of the hydrotalcite CH in parts by weight is in a range of approximately 3 parts by weight or more to approximately 30 parts by weight or less based on 100 parts by weight of the resin component, and
• a content of the acrylic monomer unit CA in mol % with respect to a total monomer unit included in the resin component and the content of the hydrotalcite CH in parts by weight satisfy the following relationship:
• 78≦CH×0.38+CA≦99, where 3≦CH≦30.

A replenishing developer used in a two-component developing method in which an electrostatic latent image is developed while the replenishing developer is supplied to a developing device and at least excessive magnetic carriers inside the developing device are discharged from the developing device,

• wherein the replenishing developer is a two-component developer comprising a magnetic carrier and a toner,
• in which the magnetic carrier comprises:
• a magnetic particle;
• and
• a coating layer disposed on a surface of the magnetic particle,
• wherein the coating layer comprises at least a resin component containing approximately 70 wt % or more of a polymer comprising an acrylic monomer CA as a component and hydrotalcite CH dispersed in a form of particles having a number-average particle diameter ranging from approximately 0.1 μm or more to approximately 0.6 μm or less,
• a content of the hydrotalcite CH in parts by weight is in a range of approximately 3 parts by weight or more to approximately 30 parts by weight or less based on 100 parts by weight of the resin component, and
• a content of the acrylic monomer unit CA in mol % with respect to a total monomer unit included in the resin component and the content of the hydrotalcite CH in parts by weight satisfy the following relationship:
• 78≦CH×0.38+CA≦99, where 3≦CH≦30;
• and the two-component developer comprises the magnetic carrier in an amount ranging from approximately 2 parts by weight or more to approximately 50 parts by weight or less based on 100 parts by weight of the toner.

A method of forming an image, the method comprising:

• charging an electrostatic latent image carrier by applying a voltage to a charging member;
• forming an electrostatic latent image on the electrostatic latent image carrier charged in the charging;
• developing the electrostatic latent image by using a two-component developer and forming a toner image on the electrostatic latent image carrier;
• transferring the toner image to a transfer material with or without an intermediate transfer body being disposed therebetween;
• and
• fixing the toner image transferred to the transfer material to the transfer material,
• wherein the two-component developer comprises a magnetic carrier and a toner, in which the magnetic carrier comprises:
• a magnetic particle;
• and
• a coating layer disposed on a surface of the magnetic particle,
• wherein the coating layer comprises at least a resin component containing approximately 70 wt % or more of a polymer comprising an acrylic monomer CA as a component and hydrotalcite CH dispersed in a form of particles having a number-average particle diameter ranging from approximately 0.1 μm or more to approximately 0.6 μm or less,
• a content of the hydrotalcite CH in parts by weight is in a range of approximately 3 parts by weight or more to approximately 30 parts by weight or less based on 100 parts by weight of the resin component, and
• a content of the acrylic monomer unit CA in mol % with respect to a total monomer unit included in the resin component and the content of the hydrotalcite CH in parts by weight satisfy the following relationship:
• 78≦CH×0.38+CA≦99, where 3≦CH≦30.