Canon Kabushiki Kaisha

Other

Wakashi Iida

Nobuyoshi Sugahara

Makoto Kanbayashi

Hironori Minagawa

Yoshihiro Ogawa

Toru Takahashi

Yojiro Hotta

Tetsuya Ida

Daisuke Tsujimoto

Takayuki Itakura

Tsuyoshi Takiguchi

Masaaki Taya

Yasuhiro Ichikawa

Yuto Onozaki

Kenji Okado

Hiroki Watanabe

Kazuhiko Hayami

Takaaki Kaya

Ryuichiro Matsuo

Minoru Yoshifuku

Hirohide Tanikawa

Nozomu Komatsu

Katsumi Kondo

Ryoichi Fujita

Takaaki Kotaki

Akira Hashimoto

Takaaki Kohtaki

Toshiyuki Ugai

Naohiko Tsuchida

Atsushi Nakano

Yoshinobu Baba

Hiroyuki Fujikawa

Michihisa Magome

Yushi Mikuriya

Kazunori Kato

Shinya Yachi

Kazumi Yoshizaki

Yuji Moriki

Junko Yoshikawa

Kohji Inaba

Nobuyoshi Sugawara

Junko Inaba

HIroki Watanabe

A toner having an adequate storage stability and adequately suppressing an ejected paper adhesion, while achieving improving low-temperature fixability, has a toner particle containing a binder resin and a plasticizer, wherein Tg1 is 53&#xb0; C. or lower and Tg2 is 55&#xb0; C. or higher, in DSC measurement using the toner as a sample, when the following steps (i) to (iii) are performed: (i): the temperature of the toner is raised for the first time at a rate of temperature increase of 10&#xb0; C./min, (ii): after the step (i), the temperature of the toner is lowered at a rate of temperature decrease of 10&#xb0; C./min, (iii): after the step (ii), the temperature of the toner is raised for the second time at a rate of temperature increase of 10&#xb0; C./min, Tg1 represents a glass transition temperature measured at the step (i), and Tg2 represents a glass transition temperature measured at the step (iii).

Toner

A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and in a molecular weight distribution of a THF soluble component of the resin component contained in the resin coating layer, a peak derived from the resin B is present in a molecular weight range of from 1000 to 9500.

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

A magnetic carrier comprising a magnetic carrier core and a resin coating layer formed on the surface of the magnetic carrier core, wherein wherein, Ris H or CH, and X is a structure represented by the following formula (2):&#x2014;(CH)&#x2014;R&#x2014;(CH)&#x2014;OH&#x2003;&#x2003;(2)wherein, Ris a hydrocarbon group being a cyclic structure having 4 to 8 carbon atoms, and m and n are integers of 0 to 4.

Magnetic carrier, two-component developer, replenishment developer, and image forming method

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.

Magnetic carrier, two-component developer, developer for replenishment, and image forming method

A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.

A toner having a toner particle, which contains a binder resin, and inorganic fine particles, the toner being characterized in that the binder resin contains a polyester resin, the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102, the number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm, the dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25&#xb0; C. and 1 MHz, and the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by formula (1) below:CH&#x2014;SiOCH)&#x2003;&#x2003;(1)in formula (1), n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.

A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2&#x3b8;) of 32.00 deg to 32.40 deg in CuK&#x3b1; characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2&#x3b8;) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.

A toner having: a toner particle including a binder resin; and an inorganic fine particle, wherein the inorganic fine particle includes a calcium strontium zirconate fine particle.

Provided is a magnetic carrier comprising a magnetic carrier particle having a magnetic body-dispersed resin carrier core material and a resin coating layer; the core material includes magnetic particles A and B having number average primary particle diameter of ra and rb (&#x3bc;m), respectively, satisfying ra&#x2265;rb; the particles A each include an oxide of at least one nonferrous metal of Mn, Al, Mg, Ti, and Ni; and an iron oxide; M1 represents total content of the nonferrous metal and F1 represents content of an iron of the magnetic carrier particle measured by XRF diffraction, M1/F1 is 0.010 to 0.100; M2 represents total content of the nonferrous metal and F2 represents content of an iron is F2 of the magnetic carrier particle measured by XPS, M2/F2 is 1.0 to 10.0.

A magnetic carrier having a ferrite-type core material and a resin coat layer present on the surface of the ferrite-type core material, wherein the ferrite-type core material contains a magnetic ferrite-type core material particle and an amino group-bearing primer compound; the resin coat layer contains a coating resin A that is a polymer of monomer containing a (meth)acrylate ester having an alicyclic hydrocarbon group; the content of the amino group-bearing primer compound in the ferrite-type core material and the content of the resin coat layer in the magnetic carrier are within the prescribed range.

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

A magnetic carrier according to the present invention includes a magnetic carrier core and a resin covering layer formed on a surface of the magnetic carrier core, wherein the resin covering layer contains a resin component and an inorganic fine particle, the inorganic fine particle contains an oxide of a typical metal element or a carbonate of a typical metal element, a moisture adsorption rate of the inorganic fine particle when allowed to stand in an environment of a temperature of 30&#xb0; C. and a humidity of 80% for 72 hours is 25.0% by mass or less, an electrical conductivity of the inorganic fine particle is 2.0&#xd7;10&#x3bc;S/m or more and 2.5&#xd7;10&#x3bc;S/m or less, and a degree of crystallinity of the inorganic fine particle is 60% or less.

Magnetic carrier

A toner comprises a binder resin, a colorant, and a compound represented by the following general formula [1]: (in the formula, Rto Reach independently represent a group selected from the hydrogen atom, fluorine atom, bromine atom, iodine atom, hydroxy group, acetyl group, aldehyde group, Cto Chydrocarbon groups, and amino group; X represents a group selected from the oxygen atom, sulfur atom, carbonyl group, and &#x2014;CRR&#x2014;; and Rand Reach independently represent a group selected from the hydrogen atom, bromine atom, Cto Chydroxyalkyl groups, hydroxy group, phenyl group, and Cto Chydrocarbon groups).

A magnetic carrier comprising: a magnetic material-dispersed resin carrier core material; and a resin coating layer on the surface of the magnetic material-dispersed resin carrier core material, wherein the magnetic material-dispersed resin carrier core material contains a core material particle containing a magnetic material and a binder resin, and a primer compound having an amino group, the resin coating layer contains a coating resin A, which is a polymer of monomers including at least a (meth)acrylic acid ester having an alicyclic hydrocarbon group, and the content of the primer compound in the magnetic material-dispersed resin carrier core material and the content of the resin coating layer are in specific range.

Magnetic carrier, two-component developer, replenishment developer, and image formation method

Provided is a magnetic carrier, including: a ferrite core particle; and a coating resin, in which: the coating resin has a surface resin layer and a resin composition in the stated order from a surface side thereof; the resin composition contains a resin, and an inorganic particle or carbon black that is subjected to a hydrophilic treatment; the surface resin layer contains a resin, is free of the inorganic particle or the carbon black, and has a thickness of from 0.01 &#x3bc;m or more to 4.00 &#x3bc;m or less; and a moisture percentage change between a moisture percentage when the magnetic carrier is left to stand under an environment of 30&#xb0; C. and 80% RH for 24 hours, and a moisture percentage when the magnetic carrier is left to stand under an environment of 23&#xb0; C. and 5% RH for 24 hours after the standing is 0.030 mass % or less.

Growing community of inventors

Toride, Japan

Wakashi Iida