Canon Kabushiki Kaisha

Jfe Mineral Company, Ltd.

Tohoku University

Yosuke Iwasaki

Takeshi Hashimoto

Koh Ishigami

Masaharu Miura

Yuichi Mizo

Takeshi Ohtsu

Wakiko Katsumata

Kenta Mitsuiki

Takakuni Kobori

Kentaro Kamae

Ryuichiro Matsuo

Hiroyuki Fujikawa

Daisuke Yamashita

Nozomu Komatsu

Ichiro Kanno

Takaho Shibata

Hitoshi Sano

Hideki Kaneko

Kohji Takenaka

Rei Hijikawa

Ryo Nakajima

Mitsuyoshi Matsushita

Masashi Kawasaki

Keiichiro Nakamura

Yoshiaki Hamano

Tomoteru Fukumura

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 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.

Provided is an aluminum nitride single crystal which is easier to cut than conventional ones. The presently disclosed aluminum nitride single crystalhas a matrix region M constituting a matrix of the aluminum nitride single crystal, and at least one domain region D included in the matrix region M.

Aluminum nitride single crystal

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.

Toner and method for producing toner

A wax dispersant for a toner including a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.

Wax dispersant for toner and toner

The present invention provides a toner that excels in low-temperature fixability and also maintains charging performance, storability, and anti-hot offset property even in long-term image output. The toner comprising a toner particle containing an amorphous polyester resin, a crystalline polyester resin, wax, and a colorant, wherein a weight-average molecular weight (Mw) of the crystalline polyester resin is 5000 to 14,000, and the crystalline polyester resin includes 0.5 mass % to 15.0 mass % of a segment derived from one or more aliphatic compounds selected from the group consisting of aliphatic monocarboxylic acids with a carbon number of 8 to 20 and aliphatic monohydric alcohols with a carbon number of 8 to 20.

Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.

Growing community of inventors

Abiko, Japan

Yosuke Iwasaki