Ricoh Company, Ltd.

Suzuka Karato

Tsuyoshi Sugimoto

Hideyuki Santo

Kohsuke Nagata

Koh Ohnuma

Shin Hasegawa

Shinya Nakayama

Hiroshi Yamashita

Hiroshi Yamada

Akinori Saitoh

Yuka Mizoguchi

Shinsuke Nagai

Shizuka Hashida

Takahiro Kadota

Ryuuta Yoshida

Akihiro Takeyama

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 is provided. The toner includes toner particles each comprising a binder resin and plate-like pigment particles. In a cross-section of the toner, the plate-like pigment particles have an average thickness D of 1.0 &#x3bc;m or less and a maximum length L of 5.0 &#x3bc;m or more. In a fixed toner image formed with the toner, the plate-like pigment particles have a maximum width W of 3.0 &#x3bc;m or more. The toner has a circularity of from 0.950 to 0.985.

Toner, method for producing toner, toner storage unit, 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 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

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Shizuoka, Japan

Suzuka Karato