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US 12,259,684 B2Granted
Magnetic carrier, two-component developer, and replenishment developer
AssigneeCanon Kabushiki Kaisha
InventorsRyuji Murayama, Hironori Minagawa, Yuto Onozaki, Nobuhiro Yoshida
Life of this patent
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Abstract
A magnetic carrier including: a magnetic core; and a coating resin that coats a surface of the magnetic core, wherein the resin coating layer has a thickness of 50 nm or more, a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and when a surface and a position at a depth of 20 nm from the surface of the magnetic carrier are analyzed by X-ray photoelectron spectroscopy, an amount of silicon element as determined by the analysis has a ratio within a specific range at respective positions.
Claims13
A magnetic carrier comprising:
- a magnetic core;
- and
- a resin coating layer which coats a surface of the magnetic core,
- wherein the resin coating layer has a thickness of 50 nm or more, and
- a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S0 (atomic percentage), S0 is 1.0 or more and 15.0 or less, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a position at a depth of 20 nm from a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S20 (atomic percentage), S20 is 0.0 or more and 5.0 or less.
4 more elements
A two-component developer comprising:
- a magnetic carrier;
- and
- a toner,
- the magnetic carrier comprising:
- a magnetic core;
- and
- a resin coating layer which coats a surface of the magnetic core,
- wherein the resin coating layer has a thickness of 50 nm or more, and
- a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S0 (atomic percentage), S0 is 1.0 or more and 15.0 or less, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a position at a depth of 20 nm from a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S20 (atomic percentage), S20 is 0.0 or more and 5.0 or less.
8 more elements
A replenishment developer comprising:
- a magnetic carrier;
- and
- a toner,
- the magnetic carrier comprising:
- a magnetic core;
- and
- a resin coating layer which coats a surface of the magnetic core,
- wherein the resin coating layer has a thickness of 50 nm or more, and
- a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S0 (atomic percentage), S0 is 1.0 or more and 15.0 or less, and
- when a ratio of an amount of silicon element to a sum total of an amount of nitrogen element, an amount of silicon element, an amount of fluorine element, an amount of carbon element, an amount of titanium element, an amount of strontium element, an amount of tin element, an amount of aluminum element, and an amount of oxygen element as determined when a position at a depth of 20 nm from a surface of the magnetic carrier is analyzed by X-ray photoelectron spectroscopy is denoted by S20 (atomic percentage), S20 is 0.0 or more and 5.0 or less.
8 more elements
Dependencies are inferred from the claim text.