Canon Kabushiki Kaisha

Toppan Printing Co., Ltd.

Hayato Ida

Junichi Tamura

Takashi Hirasa

Takaho Shibata

Yuya Chimoto

Takeshi Hashimoto

Kentaro Kamae

Ryuji Murayama

Daisuke Yamashita

Ichiro Kanno

Tomoyo Miyakai

Kouichirou Ochi

Kazuhisa Shirayama

Shoji Koike

Kohei Watanabe

Yoshihisa Yamashita

Kazuki Murata

Miki Ueda

Masayuki Hama

Masaharu Miura

Yukihiro Abe

Takashi Matsui

Yasutaka Akashi

Takeshi Ohtsu

Yuzo Tokunaga

Akifumi Matsubara

Akemi Watanabe

Kaoru Yoshida

Hiroyuki Fujikawa

Nozomu Komatsu

Takakuni Kobori

Yuto Onozaki

Yuichi Mizo

Hitoshi Sano

Ryo Natori

Genki Harada

Megumi Shino

Hisasuke Kajihara

Shuichi Tamura

Koh Ishigami

Naoyuki Yamamoto

Kazuhisa Kemmochi

Masayoshi Kato

Keisuke Abe

Yoshiro Tsukada

Wakiko Katsumata

Hiroki Watanabe

Megumi Ikeda

Katsuyuki Hotta

Kenji Muneuchi

A fine particle of a silicon polymer, wherein the fine particle has pores; the total pore volume of the fine particle is 0.35 to 1.00 cm/g; a number-average primary particle diameter of the fine particle is 0.05 to 0.30 μm; the silicon polymer has a siloxane bond and an Si—Rbond; Rrepresents an alkyl group having 1 to 6 carbon atoms; and designating, with reference to a chart obtained bySi-NMR measurement of the fine particle, A as a total peak area corresponding to the silicon polymer, and B as a peak area corresponding to Si—R, A and B satisfy a following formula (1):10.0≤×100≤45.0  (1).

Fine particle, external additive for toners, and toner

Provided is a toner comprising: a toner particle containing a binder resin; and an organic silicon polymer particle on a surface of the toner particle, wherein the binder resin contains a crystalline resin, and when the toner particle is pelletized and a Young's modulus of the toner measured in a micro compression test at 25° C. is represented by TE (MPa) and when one organic silicon polymer particle is separated from the toner and a Young's modulus of the one organic silicon polymer particle measured in a micro compression test at 25° C. is represented by SiE (MPa), TE and SiE satisfies 800≤TE≤2500 and 1.5≤SiE/TE≤10.0.

Toner

A toner that is excellent in low-temperature fixability at the time of high-speed printing, achieves both hot offset resistance and winding resistance, and has such satisfactory durability as not to be liable to cause an image failure even at the time of long-term endurance. The toner includes a toner particle containing a binder resin including a first resin and a second resin, wherein the first resin is a crystalline resin, wherein the second resin is an amorphous resin, wherein, the toner has a domain-matrix structure formed of: a matrix containing the first resin; and domains each containing the second resin, wherein, an endothermic quantity ΔH (J/g) derived from the first resin satisfies a relationship of ΔH≥3, and wherein, in flow tester measurement of the toner, the following relationships are satisfied: T10≥65; T1−T10≤10.

A toner having high rub resistance is provided. A toner including a toner particle containing a binder resin and a calcium carbonate particle, wherein in X-ray diffractometry of the toner particle by CuKα radiation, when the Bragg angle is defined as θ, (i) the calcium carbonate particle has peaks at 2θ of 26.5°±0.5° and 29.5°±0.5°, (ii) a crystallite diameter of crystals thereof attributed to 2θ=29.5°±0.5° is 10 nm or more and 45 nm or less, and (iii) the ratio (a/b) of a peak intensity 'a' at 2θ=26.5°±0.5° to a peak intensity “b” at 2θ=29.5°±0.5° is 0.15 or more and 0.24 or less.

An external additive for toner, wherein the external additive is an organosilicon polymer particle, and defining A (nm) as the number-average particle diameter of primary particles of the external additive measured using a scanning electron microscope, and defining B (nm) as the number-average particle diameter of the external additive measured in accordance with a centrifugal sedimentation method, the A and the B satisfy a following Expression (1):1.5≤≤3.0  (1).

External additive for toner, toner and image forming apparatus

An external additive for toner comprising a particle of a silicon polymer having a siloxane bond and a Si—O—C bond, wherein in an FT-IR spectrum of the external additive obtained by an ATR method, a maximum peak is present in a range of from 1030 cmto 1070 cm, where an average intensity in a range of from 1015 cmto 1025 cmof the spectrum is denoted by A and an average intensity in a range of from 1085 cmto 1095 cmis denoted by B, the A and the B satisfy a following formula (1):

External additive for toner and toner

A toner comprising a toner particle containing a binder resin and an inorganic fine particle, wherein the binder resin contains a crystalline resin, the crystalline resin has a first monomer unit represented by the following formula (1), the inorganic fine particle is at least one inorganic fine particle selected from the group consisting of a particle containing CaCO, a particle containing BaSO, a particle containing MgSiO(OH), and a particle containing AlSiO(OH), the inorganic fine particle is treated with a fatty acid, and a content B of the inorganic fine particle in the toner particle is 1.0 mass % or more to 15.0 mass % or less, wherein Rrepresents a hydrogen atom or a methyl group, and Rrepresents an alkyl group having 18 to 36 carbon atoms.

A toner comprising a toner particle comprising a binder resin, wherein the binder resin comprises a first resin and a second resin, the first resin is a crystalline resin, the second resin is an amorphous resin, in an observation of a cross section of the toner particle with a transmission electron microscope, a matrix-domain structure composed of a matrix comprising the first resin and domains comprising the second resin is present, an area ratio occupied by the matrix in a total area of the matrix and the domains is from 35 area % to 70 area %, a [hydrocarbon group index (Ge)]/[hydrocarbon group index (DIA)] after washing the toner with hexane is 1.10 or more.

Toner and method for producing toner

To provide a toner having both low temperature fixability and hot offset resistance and having excellent scratch resistance of a fixed image. A toner including a toner particle containing a binder resin, a crystalline polyester, and a calcium carbonate particle, in which the crystalline polyester includes a unit derived from an aliphatic diol and a unit derived from an aliphatic dicarboxylic acid, an ester group concentration Ec of the crystalline polyester is 27% by mass or more to 50% by mass or less, a content Ma of the calcium carbonate particle included in the toner particle is 3% by mass or more to 40% by mass or less, and a ratio (Ma/Mc) of the content Ma of the calcium carbonate particle included in the toner particle to a content Mc (% by mass) of the crystalline polyester included in the toner particle is 0.2 or more to 20 or less.

Toner and method for producing the same

A toner comprising a toner particle comprising a binder resin and a release agent, wherein the binder resin comprises a first resin and a second resin; the first resin is a crystalline resin having a melting point Tp of 50° C. to 90° C.; the second resin is an amorphous resin; in a cross section of the toner particle observed by a transmission electron microscope, the cross section of the toner particle has a matrix-domain structure composed of a matrix comprising the first resin and domains comprising the second resin; an area ratio of the matrix comprising the first resin in a total area of the cross section of the toner particle is 35 to 70 area %; and where a longest direction of each of the domains is taken as a longitudinal direction, a standard deviation of an angle of the longitudinal direction of the domains is 25° or less.

Toner and method for manufacturing toner

A fine particle of a silicon polymer having a siloxane group and a silanol group, wherein a moisture adsorption amount of the fine particle at a temperature of 30° C. and a humidity of 80% RH is from 1.0 mg/g to 22.0 mg/g, an amount of the silanol group of the fine particle measured by a titration method using KOH is from 0.012 mmol/g to 0.120 mmol/g, and a number average particle diameter of primary particle of the fine particle is from 0.05 μm to 0.30 μm.

Fine particle, external additive for toner, toner, two-component developer, and method for manufacturing toner

An external additive for toner comprising a particle of a silicon polymer having a siloxane bond and a Si—Rbond, wherein the Rrepresents an alkyl group having from 1 to 6 carbon atoms, in a chart obtained bySi—NMR measurement of the external additive, where a total peak area attributed to the external additive is denoted by A, and a peak area attributed to the Si—Rbond is denoted by B, a following formula (1) is satisfied, and in the chart obtained bySi—NMR measurement of the external additive, where a total peak area attributed to the silicon polymer is denoted by SA, and a peak area attributed to a T unit structure is denoted by S3, a following formula (2) is satisfied;

A toner comprising a toner particle comprising a binder resin and a wax, wherein the binder resin comprises an amorphous polyester resin and a polymer A, contents of the amorphous polyester resin and the polymer A in the binder resin are within specific ranges, the polymer A comprises a first monomer unit in which ester (meth)acrylates comprising 18 to 36 carbon atoms are polymerized, a content ratio of the first monomer unit in the polymer A is within specific range, the toner comprises a matrix-domain structure comprising a matrix comprising the amorphous polyester resin and domains, and the domains comprise a domain A comprising at least 80 mass % of the polymer A and a domain B comprising at least 80 mass % of the wax.

A toner has a toner particle containing a binder resin having a first resin and a second resin. The first resin is a crystalline resin, the second resin is an amorphous resin, and the first resin has a first monomer unit, a second monomer unit and a third monomer unit, each having a specific structure. A content of the first monomer unit a content of the third monomer unit in the first resin, and an SP value of the second monomer unit all satisfy a specific ranges, and the second resin contains at least one vinyl-based resin and/or specific hybrid resin, with a cross section of the toner having a domain-matrix structure formed of a matrix including the first resin and domains including the second resin, a number average diameter of the domains being 0.10 to 2.00 &#x3bc;m.

Toner and two component developer

A toner comprising a toner particle that contains a binder resin and a wax, wherein the binder resin contains an amorphous polyester resin, a polymer A, and a component B, a content of the amorphous polyester resin in the binder resin is at least 50.0 mass %, the polymer A has first monomer units represented by Formula (C) below and second monomer units, Rrepresents a hydrogen atom or a methyl group, R represents a C18 to C36 alkyl group, a content ratio of the first monomer units in the polymer A is from 5.0 mol % to 60.0 mol %, an SP value of the second monomer units is at least 21.00, a content of the polymer A in the binder resin is from 0.10 mass % to 10.00 mass %, and SP values of the amorphous polyester resin, the polymer A, the component B and the wax satisfy specific relationships.

Growing community of inventors

Toride, Japan

Hayato Ida