Canon Kabushiki Kaisha

Yuichi Mizo

Takeshi Ohtsu

Masaharu Miura

Wakiko Katsumata

Koh Ishigami

Yosuke Iwasaki

Kenta Mitsuiki

Kentaro Kamae

Daisuke Yamashita

Ryuichiro Matsuo

Takakuni Kobori

Takaho Shibata

Hironori Minagawa

Junichi Hagiwara

Daisuke Ito

Junichi Tamura

Hitoshi Sano

Kunihiko Kawakita

Kohji Takenaka

Rei Hijikawa

Hayato Ida

Ryuji Murayama

Ryo Nakajima

Ran Wakayama

Yasushi Tamura

Yutaro Yoshida

Takeshi Ootsu

Katsuyuki Katoh

Yasumori Kanai

A toner classification apparatus comprising a classification rotor, wherein the classification rotor comprises a first vane group containing first vanes and a second vane group containing second vanes, the second vanes have a length shorter than the first vane group; the number of second vanes, which are disposed between two adjacent first vanes, is 1 to 2, independently; each of the first vanes draws first trajectory and each of the second vanes draws second trajectory when the classification rotor rotates, a distance from the center of rotation to an outer circumference side end of the first and second trajectory are defined as L1 and L3, respectively, and a distance from the center of rotation to the center side end of the first and second trajectory are defined as L2 and L4, respectively, L1 to L4 satisfy prescribed relationships, and a toner production method using the toner classification apparatus.

Toner classification apparatus and a toner production method

Toner classification apparatus comprising classification rotor comprising a plurality of vanes extending from rotation center side of classification rotor to outer circumference side of classification rotor; the plurality of vanes are disposed with prescribed gaps established between vanes; gaps form opening facing rotation center region of classification rotor; each of vanes is disposed such that portion of vane away from of center of rotation of classification rotor is located on more upstream side in a direction of rotation of classification rotor than portion of vane closer to center of rotation of classification rotor; each of vanes has elbow; and in a horizontal cross section provided by sectioning classification rotor in a rotational axis perpendicular direction of classification rotor, shape of vane satisfies prescribed formulae, as well as toner production method comprising classification step of carrying out classification process on particles to be classified by using toner classification apparatus.

Toner classification apparatus and toner production method

A toner comprising a toner particle comprising a binder resin including a polyester resin, and a polyolefin resin having a sulfonic acid group, wherein the polyolefin resin having a sulfonic acid group is a polymer in which a vinyl polymer is bonded to a polyolefin, a content ratio of a monomer unit containing a sulfonic acid group in the vinyl polymer is from 1.0 mass % to 20.0 mass %, in a FT-IR spectrum obtained through measurement of a large particle size toner and a small particle size toner resulting from dividing, on a number basis, the toner into two substantially equal parts, a ratio of an intensity of a maximum absorption peak in a range from 1130 cmto 1170 cmwith respect to an intensity of a maximum absorption peak in a range from 1713 cmto 1723 cmexhibits a specific relationship.

Toner

A toner containing a toner particle that contains a binder resin including a polyester resin, and a polyolefin resin having &#x2014;COOM that is a neutralized carboxy group with a monovalent metal ion M, wherein the polyolefin resin having &#x2014;COOM is a polymer in which a vinyl polymer is bonded to a polyolefin, a content of a monomer unit containing &#x2014;COOM in the polyolefin resin having &#x2014;COOM is 1 to 20 mass %, and in a FT-IR spectrum obtained through measurement of a large particle size-side particle group and a small particle size-side particle group obtained by dividing the toner into two substantially equal parts, on a number basis, a ratio of the intensity of a maximum absorption peak in a range from 1545 cmto 1555 cmwith respect to the intensity of a maximum absorption peak in a range from 1713 cmto 1723 cmexhibits a specific relationship.

Toner and method of producing toner

A toner comprises a toner particle and an external additive, the toner satisfies a certain relationship with regard to &#x3c3;l (C/m) and &#x3c3;s (C/m). The toner is divided into two groups i.e. a first group and a second group with inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group. Then, al (C/m) represents an absolute value of average surface charge density of the toner included in the first group, and &#x3c3;s (C/m) represents an absolute value of average surface charge density of the toner included in the second group.

A toner containing a toner particle, in which the toner particle contains a binder resin and a pigment, and As and Al satisfy a specific relation, in a case when the toner is divided into two groups i.e. a first group and a second group with an inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group. Each of As and Al is a change rate of a surface potential of a pellet type molded product obtained by molding each of the toner in the first group and the toner in the second group under specific conditions is observed using a surface potentiometer under a specific conditions.

A toner that is suppressed from deteriorating owing to its long-term use and can maintain high transferability. The toner includes: a toner particle containing an amorphous polyester serving as a binder resin and a polymer A; and inorganic fine particles, wherein the polymer A includes a graft copolymer of a polyolefin and a vinyl-based polymer unit having a carboxylate anion group, and a metal ion having a valence of 2 or more.

A toner includes a toner particle containing a binder resin and a silica fine particle A on a surface of the toner particle, wherein D50 on a number basis of the toner is 3.0 to 6.0 the silica fine particle A is a particle having a particle diameter of 80 to 500 nm, the particle diameter being confirmable by observing the toner with a SEM, and when the average coverage with the silica fine particle A determined by image analysis of a particle group of a small particle diameter side of the toner with a SEM is set to Sand the average coverage with the silica fine particle A determined by image analysis of a particle group of a large particle diameter side of the toner with a scanning electron microscope is set to S, Sis 20 to 70 area %, Sand Ssatisfy S/S&#x2264;0.80.

A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal; the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid; the number of carbon atoms Cof the linear alkyl group, the number of carbon atoms Cof the diol, and the number of carbon atoms Cof the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, satisfy the following relationships; and a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0&#xb0; C. to 55.0&#xb0; C.8&#x2264;C&#x2264;20&#x2003;&#x2003;(1)C/C&#x2265;3.5 and 0&#x2264;|C&#x2212;C|&#x2264;3&#x2003;&#x2003;(2)C/C&#x2265;3.5 and 0&#x2264;|C&#x2212;C|&#x2264;3&#x2003;&#x2003;(3)

Provided is a magenta toner having a magenta toner particle containing a binder resin, a colorant, a wax, a wax dispersant, and a crystalline polyester, wherein the wax dispersant is a graft polymer in which a styrene acrylic resin is grafted to a hydrocarbon compound, and the styrene acrylic resin has a monomer unit having a saturated alicyclic group, the colorant contains C.I. Pigment Red 32, and when observing a cross-section of the magenta toner particle using a transmission electron microscope (TEM), crystals of the crystalline polyester are dispersed in the cross-section, and the number average value of maximum lengths of the crystals is 50 nm or less.

Magenta toner and toner kit

A toner is provided, which is obtained by heat treating a toner particle containing a crystalline polyester resin, an amorphous polyester resin, a hydrocarbon wax and a wax dispersant, wherein the crystalline polyester resin is a hybrid resin having crystalline polyester segments and amorphous vinyl segments, and a mass ratio of crystalline polyester segments and amorphous vinyl segments in the crystalline polyester resin (crystalline segments/amorphous segments) is 70/30 to 98/2.

Toner and method for manufacturing toner

A toner production method including: a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and a pulverizing step of pulverizing the melt-kneaded product. Where the temperature of the melt-kneaded product at the end of the melt-kneading step is Tk (&#xb0; C.), and the softening point of the wax dispersant is Tm (&#xb0; C.), the relationship of &#x2212;18&#x2264;[Tk&#x2212;Tm]&#x2264;10 is satisfied. The wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin. The styrene acrylic polymer has a monomer unit derived from &#x3b1;-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate.

Toner production method and polymer

Provided is a toner including a toner particle containing an amorphous resin, a colorant, a release agent, and a crystalline resin, wherein, when &#x3b7;represents the extensional viscosity of the toner at a Hencky strain at 90&#xb0; C. of 0.01 and &#x3b7;represents the extensional viscosity of the toner at a Hencky strain at 90&#xb0; C. of 0.69, &#x3b7;and &#x3b7;satisfy the relationships of the following formulas (1) and (2):3.0&#xd7;10Pa&#x2264;&#x3b7;&#x2264;2.0&#xd7;10Pa&#x2003;&#x2003;formula (1)2.0&#x2264;[&#x3b7;/&#x3b7;].&#x2003;&#x2003;formula (2)

A toner having a toner particle containing an amorphous resin, a crystalline resin, a colorant, a release agent, and a polymer in which a styrene-acrylic polymer is graft-polymerized on a polyolefin, wherein the amorphous resin contains an amorphous polyester resin A, and the amorphous polyester resin A has a monomer unit derived from polyhydric alcohol and a monomer unit derived from polyhydric carboxylic acid, has, a particular amount of a succinic acid-derived monomer unit in the monomer unit derived from polyhydric carboxylic acid, and has, a particular amount of a monomer unit derived from a propylene oxide adduct on bisphenol A in the monomer unit derived from polyhydric alcohol; and has a particular softening point, a particular solubility parameter, and a particular peak molecular weight.

A toner having a toner particle that is produced through a step of melt-kneading a resin composition containing a binder resin, a colorant, a hydrocarbon wax, and a wax dispersing agent, cooling the obtained kneaded material, pulverizing the obtained cooled material, and heat treating the resulting resin particles, wherein the wax dispersing agent is a polymer provided by graft polymerizing a styrene-acrylic polymer onto a polypropylene, the styrene-acrylic polymer is a polymer having a monomer unit derived from a cycloalkyl (meth)acrylate, and specific relationships are satisfied where Mp(p) is the melting point (&#xb0; C.) of the polypropylene and Mp(w) is the melting point (&#xb0; C.) of the hydrocarbon wax.

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Toride, Japan

Yuichi Mizo