Canon Kabushiki Kaisha

Maho Tanaka

Kunihiko Nakamura

Kenta Kamikura

Fumiya Hatakeyama

Yusuke Kosaki

Akane Masumoto

Koichi Sato

Yasushi Shimizu

Kimihiro Yoshimura

Katsuyuki Nonaka

Koji Abe

Kenji Onuma

Sara Yoshida

Toshihiko Katakura

Takenori Sueoka

Naoto Kameyama

Hiroshi Tominaga

Akira Watanabe

Shigeki Takishita

Rieko Sakamoto

Keiji Karube

A toner including: a toner particle including a toner base particle containing a binder resin, and an organosilicon condensate present on a surface of the toner base particle, wherein a charge attenuation constant of the toner is 3.5&#xd7;10or more to 1.0&#xd7;10or less.

Toner

A toner having a toner particle having a plurality of fine particles on the surface of a toner base particle, the toner base particle contains a binder resin, wherein a fine particle layer A constituted of a plurality of the fine particles is observed in an EDX mapping image of the constituent elements in a cross section of the toner particle as provided by EDX of the toner particle cross section observed using TEM; a fine particle B, containing a metal compound containing at least one metal element M selected from all the metal elements belonging to Groups 3 to 13, is observed in the fine particle layer A; and the number-average particle diameter D of the fine particle B, the average value H of the thickness of the fine particle layer A, and the standard deviation S on the thickness of the fine particle layer A satisfy prescribed relationships.

Provided is a toner, including a toner particle having: a toner base particle containing a binder resin and a colorant; and protrusion derived from a resin fine particle in a surface of the toner base particle, wherein the protrusion is covered with a condensation product of an organosilicon compound represented by the formula (1), and wherein the resin fine particle is in direct contact with the toner base particle.(R)&#x2014;Si&#x2014;(R)&#x2003;&#x2003;(1)

A toner comprising a toner particle comprising a binder resin, wherein a layer comprising an organosilicon condensate is present on the surface of the toner particle; the layer comprising the organosilicon condensate further comprises a reaction product of a compound comprising at least one metal element selected from all the metal elements belonging to Groups 3 to 13, and a polyhydric acid; in a backscattered electron image of the toner captured at a magnification of 50,000 times by using a scanning electron microscope, an average value of an area of the reaction product is from 10 nmto 5000 nm, and a coefficient of variation of the area of the reaction product is not more than 10.0.

A toner comprising a toner particle that contains a binder resin, wherein the surface of the toner particle has a reaction product of a polyhydric acid and a compound that contains a group 4 element.

Provided is a toner comprising a toner particle including a toner base particle and fine particles present on a surface of the toner base particle, wherein each of the fine particles includes a core fine particle and a condensate of at least one organosilicon compound selected from the group consisting of organosilicon compounds represented by specific structural formulas, the condensate coating the surface of the core fine particle, and in a wettability test of the toner with respect to a methanol/water mixed solvent, a methanol concentration, when a transmittance of light having a wavelength of 780 nm is 50%, is 5.0 to 20.0% by volume: 

Provided is a toner, including a toner particle containing a toner base particle and a fine particle, wherein the fine particle includes a composite particle each having a surface covered with a condensation product of at least one kind of organosilicon compound selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2), wherein the fine particle is stuck in a state of being embedded in a surface of the toner base particle, and wherein a coverage of a composition containing the organosilicon compound with respect to the surface of the toner base particle excluding the fine particle is 0.1% by area or more and 40.0% by area or less: 

There is provided a method of manufacturing a toner including a toner particle containing a binder resin, the method including:

Method of manufacturing toner

A first aspect is a toner production method in which an organosilicon compound is condensed in a surfactant-containing aqueous medium with a specific surface tension, in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle, and a second aspect is a toner production method in which an organosilicon compound is condensed in an aqueous medium which has a surfactant and a specific metal salt and in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle.

Method of producing toner

Provided is a toner that is excellent in development durability and has excellent solid followability even when the amount of the toner in a toner cartridge is small. The toner includes toner particles each having a surface layer containing an organosilicon polymer, in which: the organosilicon polymer includes a siloxane-based polymer having partial structures represented by the following formulae (1) and (2); and in a chart obtained bySi-NMR measurement of a tetrahydrofuran-insoluble matter of the toner particles, an area RT3 of a peak assigned to the partial structure represented by the following formula (1) and an area RfT3 of a peak assigned to the partial structure represented by the following formula (2) satisfy the following formula (3).0.300&#x3e;(3/3)&#x2267;0.010&#x2003;&#x2003;(3)R&#x2014;SiO&#x2003;&#x2003;(1)Rf&#x2014;SiO&#x2003;&#x2003;(2)

A member for electrophotography having a multilayer structure or a single-layer structure, including an outermost layer which satisfies the following A, B and C:

Growing community of inventors

Tokyo, Japan

Maho Tanaka