Canon Kabushiki Kaisha

Canon Finetech Inc.

Yuhei Terui

Katsuyuki Nonaka

Koji Abe

Naoya Isono

Yu Yoshida

Haruko Kubo

Hitoshi Itabashi

Masamichi Sato

Akira Sugiyama

Yasuhiro Hashimoto

Taiji Katsura

Naotaka Ikeda

Shohei Yamashita

Takayuki Toyoda

Tsutomu Shimano

Emi Watanabe

Koji Nishikawa

Masashi Kawamura

Yuki Nishizawa

Kohei Matsuda

Koki Inoue

Junya Asaoka

Yuu Sasano

Tomonori Matsunaga

Noriyoshi Umeda

Shohei Kototani

Yoshihiro Nakagawa

Yasuaki Murai

Satoshi Handa

Hidekazu Fumita

Shota Amano

Takeshi Tsujino

Kenta Katayama

Tomoya Yamamoto

Kenji Aoki

Takeshi Sekiguchi

Toshiaki Takeuchi

Yoshihiro Mitsui

Tsuneyoshi Tominaga

Waka Hasegawa

Kentaro Yamawaki

Yuichiro Hirata

Yasutaka Yagi

Masanori Seki

Go Shindo

Yasukazu Ikami

Kosuke Ikada

Kazunori Hashimoto

Harumi Takada

Shintaro Kawaguchi

Katsuhiro Kojima

Shohei Shibahara

Suzuka Ueno

Junko Chizuwa

Akinobu Saito

The powder adhesive comprises a thermoplastic resin and particles of an aromatic compound, wherein the particles of an aromatic compound are particles of a compound that has an aromatic ring and an azo bond bonded to the aromatic ring, or are particles of a compound comprising a heteroaromatic ring comprising nitrogen atom; the thermoplastic resin comprises an ester group; and, designating Es (mmol/g) as an ester group concentration in the thermoplastic resin, M (mass %) as a content of the aromatic compound particles in the powder adhesive, and N (mmol/g) as a nitrogen atom concentration in the aromatic compound particles, Es is from 1.0 mmol/g to 4.5 mmol/g, M is from 1.0×10mass % to 1.0×10mass %, and N is from 5.0 mmol/g to 15.0 mmol/g.

Powder adhesive and bonded article

An electrophotographic developer set comprising a toner, and a powder adhesive, wherein the powder adhesive comprises a crystalline polyester resin, and a thermoplastic resin other than the crystalline polyester resin; the amount of the crystalline polyester resin in the powder adhesive is 21% by mass or more; the melting point of the crystalline polyester resin is 55° C. to 100° C.; in a viscoelasticity measurement, where Gt'(100) denotes a storage elastic modulus of the toner at 100° C. and Gb′(100) denotes a storage elastic modulus of the powder adhesive at 100° C., Gb′(100) is 1.0×10Pa or less and Gt′(100)/Gb′(100) is 1.2 or more.

Electrophotographic developer set comprising toner and powder adhesive, and method for producing bonded product

A production method of a toner having a toner particle that contains a binder resin and an external additive that is externally added to the toner particle, wherein the production method has a toner particle dispersion step of obtaining a toner particle dispersion by dispersing the toner particle and an inorganic dispersant in an aqueous medium; and an external addition step of externally adding the external additive to the toner particle through addition of the external additive to the toner particle dispersion.

Method for producing a toner

An electrophotographic developer set comprising a toner comprising a thermoplastic resin and a wax, and a powder adhesive comprising a thermoplastic resin and a wax, wherein where Ea (mmol/g) denotes an ester group concentration of the wax contained in the toner, Na (mass %) denotes a content of the wax in the toner, Eb (mmol/g) denotes an ester group concentration of the wax contained in the powder adhesive, and Nb (mass %) denotes a content of the wax in the powder adhesive, the Ea, the Na, the Eb and the Nb satisfy the following formulae: 0.00≤Ea≤2.45, 2.50≤Eb≤3.60, and 0.80≤Nb/Na.

Electrophotographic developer set comprising toner and powder adhesive, method for producing bonded product, and powder adhesive

A hot-melt adhesive comprising a thermoplastic resin and a first crystalline material, wherein when in differential scanning calorimetric measurement of the hot-melt adhesive, Tc (° C.) is a peak temperature of the highest peak of exothermic peaks observed in a temperature reduction process at 10° C./min following heating to 150° C. and Tm (° C.) is a peak temperature of the highest peak of endothermic peaks observed in a temperature increasing process at 10° C./min following the temperature reduction process, Tm−Tc is 20.0 to 70.0° C., and a tetrahydrofuran-soluble matter of the hot-melt adhesive has a weight-average molecular weight Mw, as measured by gel permeation chromatography, of 100,000 to 400,000.

Hot-melt adhesive and method for producing bonded article

A toner comprising a toner particle that contains a binder resin and a wax, wherein the toner particle contains an organosilicon polymer as given by formula (1) below;R&#x2014;SiO&#x2003;&#x2003;(1),in formula (1), Ris an alkyl group having from 1 to 4 carbons; in a cross section of the toner particle observed using a transmission electron microscope, in terms of a distance A from the centroid of the cross section of the toner particle to a contour of the cross section, the organosilicon polymer is present in a region that is not more than 80% of the distance A from the centroid; and an absolute value of a difference between an SP value of the organosilicon polymer and an SP value of the wax is not more than 0.70 (cal/cm).

Toner

A toner having a toner particle including a toner base particle and an organosilicon polymer coating the toner base particle, wherein when S1 (&#x3bc;m) is a total area of a non-coated part not coated with the organosilicon polymer on an outermost surface of the toner particle, S2 (&#x3bc;m) is a total area of a coated part coated with the organosilicon polymer on the outermost surface of the toner particle, and SA1 (&#x3bc;m) is a total of areas of non-coated part domains D1 with an area of not more than 0.10 &#x3bc;min size in the non-coated part not coated with the organosilicon polymer, formulae (1) and (2) below are satisfied.0.45&#x2264;[2/(1+2)]&#x2264;0.65&#x2003;&#x2003;(1)(1/1)&#x2265;0.50&#x2003;&#x2003;(2)

Provided is an electrophotographic developer set having a toner and a powder adhesive, wherein the toner comprises a thermoplastic resin A; the powder adhesive comprises a thermoplastic resin B and a wax A; the wax A has two or more ester groups in the molecule; the thermoplastic resin B has an ester group; and in a viscoelasticity measurement, with Gt'(100) (Pa) being a storage elastic modulus at 100&#xb0; C. of the toner, and Gb&#x2032;(100) (Pa) being a storage elastic modulus at 100&#xb0; C. of the powder adhesive, Gb&#x2032;(100) is 1.00&#xd7;10Pa or less, and Gt&#x2032;(100)/Gb&#x2032;(100) is 1.20 or more, as well as a method for producing a bonded product using the above electrophotographic developer set.

Electrophotographic developer set including toner and powder adhesive, and method for producing bonded product

Provided is a toner containing a toner particle comprising a binder resin and an organosilicon polymer, wherein the organosilicon polymer contains an organosilicon polymer particle, the organosilicon polymer particle has a structure represented by the following formula (1):R&#x2014;SiO&#x2003;&#x2003;(1)in formula (1), Ris a Calkyl group, and in cross-sectional observation of the toner particle by transmission electron microscopy, the organosilicon polymer particle is present in a region extending up to 80% of the distance A from the centroid out of the total distance A from the centroid of the toner particle cross-section to the contour of the cross-section, and the particle diameter of the organosilicon polymer particle is from 10 nm to 200 nm.

A process cartridge includes a seal member contacting an image bearing member upstream in the rotation direction of the image bearing member from a cleaning member and allowing the developer to move from upstream in the rotation direction from the contact part between the seal member and the image bearing to downstream from the contact part while regulating movement from downstream to upstream from the contact part. The developer has surface protrusions containing an organic silicon polymer, wherein either (i) the work function of the seal member is greater than the work function of the developer when the developer has a negative charging polarity and is smaller than the work function of the developer when the developer has a positive charging polarity, or (ii) the absolute value of the difference between the work function of the seal member and the work function of the developer is within a predetermined range.

Process cartridge, image forming apparatus and cleaning apparatus

A image-forming apparatus includes a plurality of process cartridges each having a toner and an image bearing member, and has an intermediate transfer member, wherein the toner comprises a toner particle that contains a toner base particle and a prescribed organosilicon polymer on the surface of the toner base particle, and the organosilicon polymer forms protruded portions on the surface of the toner base particle, for the protrusions having a protrusion height H from 40 nm to 300 nm, the numerical proportion P(D/w) of protruded portions having a ratio of the protrusion diameter D to the protrusion width w in a prescribed range is at least 70 number %, and one of the plurality of process cartridges has a carbon black-containing black toner, and the weight-average particle diameter of this black toner is smaller than that of the toner present in the other process cartridges.

Image-forming apparatus

A toner comprising a toner particle that contains a toner base particle and an organosilicon polymer on a surface of the toner base particle, wherein the organosilicon polymer forms protruded portions with a prescribed structure on the surface of the toner base particle, and in the toner cross section, when the protrusion width w is the length of the segment where a protruded portion and the toner base particle form a continuous interface, the protrusion diameter D is the maximum length of a protruded portion, and the protrusion height H is the length from the peak of the protruded portion to the line along the circumference of the toner base particle surface, the numerical proportion of these protruded portions having a ratio D/w of the protrusion diameter D to the protrusion width w from 0.33 to 0.80, is a least 70 number %.

Toner comprising a surface layer of an organosilicon polymer protrusion

A toner containing a toner particle including a binder resin, a resin A having a pKa of 6.0-9.0, and a pigment having a pKb of 4.0-7.0, wherein the pKa is an acid dissociation constant measured by preparing a resin solution in which 1.0 part by mass of the resin A, 70.0 parts by mass of toluene and 30.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a potassium hydroxide ethanol solution of 0.1 mol/L, and the pKb is a basic dissociation constant measured by preparing a pigment dispersion in which 10.0 parts by mass of the pigment, 140.0 parts by mass of toluene and 60.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a hydrochloric acid ethanol solution of 0.1 mol/L.

Toner and toner manufacturing method

In a toner containing a binder resin, a pigment, a pigment dispersant, and a fixing assistant, the pigment dispersant has a structure represented by formula (1) or a tautomer thereof and a polymer moiety, the binder resin and the fixing assistant satisfy formula (2), and a hydrophobic parameter HP1 of the pigment dispersant and a hydrophobic parameter HP2 of the fixing assistant satisfy formula (3). 

Toner and method for manufacturing the same

Provided is a toner comprising a toner particle containing: a binder resin; a pigment; a resin having an acidic functional group; and a fixing auxiliary agent, wherein the pigment is a pigment having a structure derived from a basic compound, and the binder resin and the fixing auxiliary agent satisfy following Formula (1):()&#x2265;5.0&#xb0; C.&#x2003;&#x2003;Formula (1)and given HP1 as a hydrophobic parameter of the resin having an acidic functional group and HP2 as a hydrophobic parameter of the fixing auxiliary agent, the HP1 is at least 0.60, and following Formula (2) is satisfied:|HP1&#x2212;HP2|&#x2264;0.30&#x2003;&#x2003;Formula (2).

Toner and method for manufacturing toner

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Numazu, Japan

Yuhei Terui