Ricoh Company, Ltd.

Kohsuke Nagata

Tsuyoshi Sugimoto

Shinya Nakayama

Hiroshi Yamada

Hideyuki Santo

Suzuka Amemori

Susumu Chiba

Shinsuke Nagai

Koh Ohnuma

Suzuka Karato

Akinori Saitoh

Daisuke Asahina

Ryuta Chiba

Atsushi Yamamoto

Minoru Masuda

Akihiro Takeyama

Takamasa Hase

Hiroshi Yamashita

Shin Hasegawa

Hiroyuki Takeda

Toyoshi Sawada

Junichi Awamura

Masahide Yamada

Satoyuki Sekiguchi

Keiji Makabe

Tatsuya Morita

Yuka Mizoguchi

Takahiro Kadota

Ryuuta Yoshida

Hideyuki Santoh

Masayuki Ukigaya

A toner is provided. The toner comprises a colorant, a release agent, and a binder resin. The binder resin comprises a crystalline polyester resin and an amorphous polyester resin. The amorphous polyester resin comprises an amorphous polyester resin A and an amorphous polyester resin B. The amorphous polyester resin A comprises an isocyanurate backbone and at least one of urethane bond and urea bond. The amorphous polyester resin B comprises a trimellitic acid backbone and at least one of urethane bond and urea bond.

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

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 toner, including: a colorant; a binder resin; and a releasing agent, wherein the binder resin includes a polyester resin, and the toner satisfies requirements (1) and (2) below: (1): G'(50)&#x2265;3.0&#xd7;10Pa and 1.0&#xd7;10Pa&#x2264;G&#x2032;(60)&#x2264;1.0&#xd7;10Pa, where G&#x2032;(50) is a storage modulus at 50&#xb0; C. of the toner and G&#x2032;(60) is a storage modulus at 60&#xb0; C. of the toner; and (2): a spin-spin relaxation time of the toner at 50&#xb0; C. measured by solid echo method of pulse NMR is 1.0 ms or shorter.

Toner

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 including: a pigment; polyester resin A that is insoluble in tetrahydrofuran (THF); and polyester resin B that is soluble in THF, wherein the toner satisfies requirements (1) to (3) below:

Toner, developer, and image formation device

Toner that includes a polyester resin, fluorine and aluminum. The toner satisfies formulae (1) and (2),1.00&#x2267;&#x2267;0.50&#x2003;&#x2003;(1)0&#x2266;()/&#x2266;0.25&#x2003;&#x2003;(2)

Toner, toner stored unit, image forming apparatus, and image forming method

A polyester resin for a toner, the polyester resin including: 4,000&#x2266;Weight average molecular weight (Mw)&#x2266;25,000&#x2003;&#x2003; Expression (2); and0.5&#x2266;(Amount of the trivalent or higher aliphatic alcohol)&#x2266;6.5&#x2003;&#x2003; Expression (3),

Polyester resin for toner, toner, developer, and image formation device

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 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 toner, wherein the toner has glass transition temperature [Tg1st (toner)] of 20&#xb0; C. to 50&#xb0; C., where the glass transition temperature [Tg1st (toner)] is measured in a first heating in differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has glass transition temperature [Tg2nd (THF insoluble matter)] of &#x2212;40&#xb0; C. to 30&#xb0; C., where the glass transition temperature [Tg2nd (THF insoluble matter)] is measured in a second heating in differential scanning calorimetry (DSC) of the tetrahydrofuran (THF) insoluble matter, wherein the THF insoluble matter has a storage modulus at 100&#xb0; C. [G'(100) (THF insoluble matter)] of 1.0&#xd7;10Pa to 1.0&#xd7;10Pa, and wherein a ratio of a storage modulus of the THF insoluble matter at 40&#xb0; C. [G&#x2032;(40) (THF insoluble matter)] to the storage modulus of the THF insoluble matter at 100&#xb0; C. [G&#x2032;(100) (THF insoluble matter)] is 3.5&#xd7;10 or less.

A toner, including: a polyester resin, wherein the polyester resin includes a diol component and a crosslink component as constituent components thereof, wherein the diol component contains an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more, wherein the crosslink component contains a trihydric or higher aliphatic alcohol, and 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 in differential scanning calorimetry (DSC) of the toner.

To provide a toner for developing an electrostatic image, the toner including toner particles, wherein the toner particles contain: a non-crystalline resin A; and a crystalline resin, wherein the crystalline resin contains a crystalline resin C containing a urethane bond, or a urea bond, or both thereof, and wherein the toner particles each have a sea-island structure, where the resin C is dispersed in the non-crystalline resin on a cross-section of the toner particle.

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Shizuoka, Japan

Kohsuke Nagata