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US 10,852,653 B2Granted
Magnetic carrier, two-component developer, developer for replenishment, and image forming method
AssigneeCanon Kabushiki Kaisha
InventorsRyuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
Life of this patent
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Abstract
A magnetic carrier includes a magnetic carrier particle including a magnetic carrier core particle having an amino group on a surface thereof and a resin covering layer disposed on the surface of the magnetic carrier core particle, in which the resin covering layer contains a vinyl-based copolymer and a trialkoxyalkylsilane.
Claims11
A magnetic carrier, comprising:
- a magnetic carrier particle including:
- a magnetic carrier core particle having an amino group on a surface thereof, and
- a resin covering layer disposed on the surface of the magnetic carrier core particle,
- wherein the resin covering layer contains:
- a vinyl-based copolymer, and
- a compound represented by Formula (1):
- where R1 is a chain alkyl group having 6 to 12 carbon atoms, and each R2 is independently a methyl group or an ethyl group.
4 more elements
A two-component developer, comprising:
- a toner including:
- a toner particle containing:
- a binder resin,
- a colorant, and
- a release agent;
- and
- a magnetic carrier,
- wherein the magnetic carrier includes:
- a magnetic carrier particle including:
- a magnetic carrier core particle having an amino group on a surface thereof, and
- a resin covering layer disposed on the surface of the magnetic carrier core particle, and
- wherein the resin covering layer contains:
- a vinyl-based copolymer, and
- a compound represented by Formula (1):
- where R1 is a chain alkyl group having 6 to 12 carbon atoms, and each R2 is independently a methyl group or an ethyl group.
12 more elements
An image forming method, comprising:
- charging an electrostatic latent image-bearing member;
- forming an electrostatic latent image on a surface of the electrostatic latent image-bearing member;
- developing the electrostatic latent image with a two-component developer to form a toner image;
- transferring the toner image to a transfer material with or without an intermediate transfer member;
- and
- fixing the transferred toner image on the transfer material,
- wherein the two-component developer including:
- a toner including:
- a toner particle containing:
- a binder resin,
- a colorant, and
- a release agent;
- and
- a magnetic carrier,
- wherein the magnetic carrier includes:
- a magnetic carrier particle including:
- a magnetic carrier core particle having an amino group on a surface thereof, and
- a resin covering layer disposed on the surface of the magnetic carrier core particle, and
- wherein the resin covering layer contains:
- a vinyl-based copolymer, and
- a compound represented by Formula (1):
- where R1 is a chain alkyl group having 6 to 12 carbon atoms, and each R2 is independently a methyl group or an ethyl group.
19 more elements
A developer for replenishment for use in an image forming method, the developer comprising:
- a toner including:
- a magnetic carrier for replenishment, and
- a toner particle containing:
- a binder resin,
- a colorant, and
- a release agent,
- the method including:
- charging an electrostatic latent image-bearing member,
- forming an electrostatic latent image on a surface of the electrostatic latent image-bearing member,
- the electrostatic latent image with a two-component developer in a developing unit to form a toner image,
- transferring the toner image to a transfer material with or without an intermediate transfer member, and
- fixing the transferred toner image on the transfer material,
- wherein the developer for replenishment is supplied to the developing unit in response to a decrease in toner concentration of the two-component developer in the developing unit, and an excess of the magnetic carrier in the developing unit is discharged from the developing unit as needed,
- wherein the developer for replenishment contains 2 parts or more by mass and 50 parts or less by mass of the toner per 1 part by mass of the magnetic carrier for replenishment,
- the magnetic carrier for replenishment includes:
- a magnetic carrier particle including:
- a magnetic carrier core particle having an amino group on a surface thereof, and
- a resin covering layer disposed on the surface of the magnetic carrier core particle, and
- the resin covering layer contains:
- a vinyl-based copolymer, and
- a compound represented by Formula (1):
- where R1 is a chain alkyl group having 6 to 12 carbon atoms, and each R2 is independently a methyl group or an ethyl group.
19 more elements
An image forming method, comprising:
- charging an electrostatic latent image-bearing member;
- forming an electrostatic latent image on a surface of the electrostatic latent image-bearing member;
- developing the electrostatic latent image with a two-component developer in a developing unit to form a toner image;
- transferring the toner image to a transfer material with or without an intermediate transfer member;
- and
- fixing the transferred toner image on the transfer material,
- a developer for replenishment being supplied to the developing unit in response to a decrease in toner concentration of the two-component developer in the developing unit, an excess of a magnetic carrier in the developing unit being discharged from the developing unit as needed,
- wherein the developer for replenishment includes:
- a toner including:
- the magnetic carrier for replenishment, and
- a toner particle containing:
- a binder resin,
- a colorant, and
- a release agent,
- the developer for replenishment contains 2 parts or more by mass and 50 parts or less by mass of the toner per 1 part by mass of the magnetic carrier for replenishment,
- the magnetic carrier for replenishment includes:
- a magnetic carrier particle including:
- a magnetic carrier core particle having an amino group on a surface thereof, and
- a resin covering layer disposed on the surface of the magnetic carrier core particle, and
- the resin covering layer contains:
- a vinyl-based copolymer, and
- a compound represented by Formula (1):
- where R1 is a chain alkyl group having 6 to 12 carbon atoms, and each R2 is independently a methyl group or an ethyl group.
20 more elements
Dependencies are inferred from the claim text.