Ricoh Company, Ltd.

Hideyuki Santo

Shinya Nakayama

Atsushi Yamamoto

Suzuka Amemori

Masahide Yamada

Yukiko Nakajima

Tsuyoshi Sugimoto

Daiki Yamashita

Kohsuke Nagata

Shingo Sakashita

Akiyoshi Sabu

Hiroshi Yamada

Koh Ohnuma

Suzuka Karato

Shin Hasegawa

Yoshihiro Moriya

Ryuta Chiba

Minoru Masuda

Keiji Makabe

Shinsuke Nagai

Takamasa Hase

Kazumi Suzuki

Akinori Saitoh

Akihiro Takeyama

Mitsuo Aoki

Yukiko Iwasaki

Masashi Nagayama

Shigenori Yaguchi

Yoshitaka Yamauchi

Tsuneyasu Nagatomo

Taichi Nemoto

Daisuke Asahina

Nobuyasu Makino

Tatsuya Morita

Tetsuya Tanaka

Tomoyuki Satoh

Hiroyuki Takeda

Takahiro Kadota

Ryuuta Yoshida

Yoichi Maekawa

Kazunobu Muramatsu

Suzuka Amerori

A toner, including: a polyester resin, wherein the polyester resin has a structure represented by any one of formulas 1) to 3) below: 1) R1-(NHCONH-R2)n-, 2) R1-(NHCOO-R2)n-, and 3) R1-(OCONH-R2)n-, where n is 3 or more, R1 represents an aromatic organic group or an aliphatic organic group, and R2 represents a group derived from a resin that is polyester formed of polycarboxylic acid, polyol, or both thereof; or that is a modified polyester obtained by modifying polyester with isocyanate. 

Toner, toner accommodating unit, and image forming apparatus

Provided is a toner including a crystalline polyester resin including a constitutional unit derived from saturated aliphatic dicarboxylic acid and a constitutional unit derived from saturated aliphatic diol, an amorphous hybrid resin, an amorphous polyester resin, a release agent, and a colorant, wherein the crystalline polyester resin includes a constitutional unit derived from sebacic acid as the constitutional unit derived from the saturated aliphatic dicarboxylic acid, and the amorphous hybrid resin is a composite resin including a polyester-based resin unit and a styrene-based resin unit.

Toner, developer, and image forming apparatus

A layered inorganic mineral including a surface treated with a fluorine-containing compound, where the layered inoganic mineral that can be favorably used for a toner that is excellent in high charging ability, charging stability, and low temperature fixing ability, and that can exhibits high reliability during cleaning.

Layered inorganic mineral, toner, and image forming apparatus

A toner is provided. The toner includes an amorphous resin, a crystalline resin dispersed in the amorphous resin, and a release agent. The toner satisfies the following inequality:&#x3c;0.8where A represents a perimeter of the crystalline resin and B represents a length of a part of the perimeter A of the crystalline resin at which the crystalline resin is in contact with the amorphous resin, A and B being measured from a cross-sectional image of the toner observed with transmission electron microscope.

Toner, toner storage unit, image forming apparatus, and method for manufacturing toner

A toner includes a base particle including a polyester resin and a colorant. A sea-island structure is observed by a transmission electron microscope (TEM) in a cross-sectional image of the toner. The island structure includes the colorant and has an average diameter of from 0.2 &#x3bc;m to 1.0 &#x3bc;m, and the number of the island structure is from 5 to 30.

Toner, developer and developer containing unit

A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

Toner, developer using the toner, image forming apparatus

A toner includes a polyester resin including a polyester resin component A (A) insoluble in tetrahydrofuran; and a polyester resin component B (B) soluble in tetrahydrofuran. The toner has a first glass transition temperature (Tg1st) of from 20&#xb0; C. to 50&#xb0; C., measured at a first temperature rising in differential scanning calorimetry (DSC), and satisfies the following formulae (1) and (2):=1/{/(+273)+/(+273)}&#x2212;273&#x2003;&#x2003;(1)&#x3e;30&#xd7;&#x2003;&#x2003;(2)wherein a and b represent weight ratios of (A) and (B) to a total weight of (A) and (B), and satisfy the equation a+b=1; and TgA, TgB and TgAB represent second glass transition temperatures (Tg2nd), measured at a second temperature rising in differential scanning calorimetry, of (A), (B), and a mixture of (A) and (B), respectively.

Toner, developer, image forming apparatus, and process cartridge

A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20&#xb0; C. to 50&#xb0; C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30&#xb0; C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.

Electrostatic image developing toner, developer, and image forming apparatus

A resin for toner contains a polyhydroxycarboxylic acid skeleton and a rigid skeleton.

Resin for toner, toner using the resin, and development agent using the toner

An image forming apparatus includes: an image bearing member; a charger; an irradiator; a development device having an accommodation unit to accommodate toner to obtain a visible image; a transfer device; and a fixing device to fix the visible image transferred onto a recording medium. The fixing device having a fixing rotation member; and a pressure rotation member to form a nipping portion by contacting the fixing rotation member, wherein the surface pressure of the nipping portion is 1.5 kgf/cmor less, wherein the fixing rotation member has a Martens hardness of 1.0 N/mmor less at 23&#xb0; C., wherein the ratio of the projected area of a single particle of the toner onto the recording medium at 120&#xb0; C. to the projected area of a single particle of the toner onto the recording medium at 23&#xb0; C. is 1.60 or less.

Image forming apparatus

A colorless transparent toner containing a crystalline resin having a urethane bond and/or a urea bond.

Colorless transparent toner, toner set, development agent, image forming apparatus, and printed matter

A development agent containing toner that contains a binder resin having a crystalline resin that has a urethane and/or urea bond in its main chain, a coloring agent, and an organically modified inorganic laminate compound in which organic ions are at least partially substituted for ions present between layers of the organically modified inorganic laminate compound, and toner carrier that contains a core material whose surface is coated with a coating layer having a condensed compound of a melamine resin and/or a guanamine resin and an acrylic resin having a hydroxyl group.

Development agent and image forming apparatus employing same

A toner, including: a crystalline resin containing a urethane bond, a urea bond, or both thereof; and a compound represented by the following General Formula (1), wherein an amount of the compound represented by the General Formula (1) is 0.01% by mass to 0.25% by mass:CHR&#x2003;&#x2003;General Formula (1)

Toner, developer and image forming apparatus

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Kanagawa, Japan

Hideyuki Santo