Ricoh Company, Ltd.

Syouko Satoh

Daisuke Ito

Daisuke Inoue

Satoshi Kojima

Osamu Uchinokura

Junichi Awamura

Satoshi Ogawa

Takahiro Honda

Tsuneyasu Nagatomo

Teruki Kusahara

Kiwako Hirohara

Masaki Watanabe

Tsuyoshi Sugimoto

Tomomi Suzuki

Hyo Shu

Mamoru Hozumi

Ryuuta Yoshida

Koshi Sato

A toner set, including: a transparent toner including a binder resin a, a releasing agent a and no colorant; and one or more color toners, each including a binder resin b, a colorant b and a releasing agent b, wherein the binder resin a includes a non-crystalline resin &#x3b1; and a crystalline resin &#x3b1;, the binder resin b includes a non-crystalline resin &#x3b2; and a crystalline resin &#x3b2;, the releasing agent a has an average particle diameter as a long diameter of 0.2 &#x3bc;m to 2.0 &#x3bc;m, and there is a relationship of 1&#x3c;A/B&#x3c;1.5, where A is an area of the releasing agent a in a transparent toner cross-section from a surface thereof to a &#x2153;-depth of a volume-average particle diameter, and B is an area of the releasing agent b in a color-toner cross-section from a surface thereof to a &#x2153;-depth of a volume-average particle diameter.

Toner set, developer set, and image forming apparatus

A toner including: toner base particles; and an external additive, the toner base particles each comprising a binder resin and a colorant, wherein the external additive comprises non-spherical particles and spherical particles, wherein the non-spherical particles are each a secondary particle in which spherical primary particles are coalesced together, and wherein the non-spherical particles and the spherical particles in the external additive satisfy a relationship expressed by the following formula (1):3(%)&#x3c;(%)&#x2003;&#x2003;Formula (1) where Ca is greater than 10% but smaller than 20% and Cb is greater than 40% but smaller than 70%, and Ca and Cb are values given by: 

Toner, two-component developer and image forming apparatus

A toner for developing an electrostatic image, including: toner base particles each including a binder resin and a releasing agent; and inorganic fine particles, wherein the toner includes the inorganic fine particles as an external additive on a surface of the toner base particle, wherein the toner base particles have a BET specific surface area of 2.5 m/g to 5.0 m/g, and wherein the inorganic fine particles comprise inorganic fine particles (A) which are each a secondary particle where a plurality of primary particles are coalesced together.

Toner for developing electrostatic image, two-component developer and image forming apparatus

To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A&#x3e;0.165, and has storage elastic modulus (dyne/cm) G'(Tfb) satisfying G&#x2032;(Tfb)&#x2266;1&#xd7;10where Tfb is a flow onset temperature (&#xb0; C.) of the low molecular weight resin component as measured by a capillary rheometer:=|[(1)&#x2212;ln&#x2032;(2)]/(1&#x2212;2)|&#x2003;&#x2003;Formula (1)(where T1 is temperature (&#xb0; C.) at which storage elastic modulus G&#x2032;(r1) is 1&#xd7;10(dyne/cm) and T2 is temperature (&#xb0; C.) at which storage elastic modulus G&#x2032;(r2) is 1&#xd7;10(dyne/cm) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).

Toner for electrostatic charge development

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Miyagi, Japan

Syouko Satoh