Ricoh Company, Ltd.

Other

Fujitsu Corporation

Osamu Uchinokura

Junichi Awamura

Hideki Sugiura

Satoshi Mochizuki

Takahiro Honda

Tomoyuki Ichikawa

Shinya Nakayama

Daisuke Inoue

Satoshi Kojima

Akihiro Kotsugai

Yasuo Asahina

Hisashi Nakajima

Naohiro Watanabe

Tsuneyasu Nagatomo

Hiroshi Yamashita

Yasuaki Iwamoto

Koichi Sakata

Satoshi Ogawa

Daisuke Ito

Akinori Saitoh

Masami Tomita

Masahide Yamada

Masayuki Ishii

Hiroyuki Fushimi

Shinichiro Yagi

Masaki Watanabe

Hiroshi Yamada

Fumihiro Sasaki

Tomomi Suzuki

Tsuyoshi Sugimoto

Toshiki Nanya

Yoshimichi Katagiri

Shigeru Emoto

Takashi Yamamoto

Hiroto Higuchi

Takashi Yoshida

Hitoshi Iwatsuki

Shinichi Kuramoto

Tomio Kondou

Kohki Katoh

Yohichiroh Watanabe

Ryota Inoue

Tsunemi Sugiyama

Naohito Shimota

Takuya Saito

Kazuhiko Umemura

Masashi Nagayama

Mamoru Hozumi

Tomoko Utsumi

Teruki Kusahara

Masakazu Kinoshita

Masae Nakamura

Syouko Satoh

Hachiro Tosaka

Tomoyuki Satoh

Shinya Hanatani

Hachiroh Tosaka

Kiwako Hirohara

Masahiro Ohki

Hyo Shu

Sonoh Matsuoka

Yoshihiro Suguro

Shin-ichi Kuramoto

Ryuuta Yoshida

Yoshimi Mizoguchi

Shoko Sato

Kumi Hasegawa

Satoru Miyamoto

Masaaki Oka

Kohichi Sakata

Tomoki Murayama

Noboru Kuroda

Hidetoshi Noda

Ryuta Chiba

Shohichi Sugimoto

Hitoshi Ueda

Ken Umehara

Kazuhiko Hamazoe

Tsuyoshi Fukushima

Hideyuki Ueda

Tamotsu Kajihara

Naoko Morisawa

Koutaro Kitano

Koshi Sato

Yasuaki Ohta

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 a binder resin which contains a crystalline polyester resin and a non-crystalline polyester resin, wherein the crystalline polyester resin has at least two diffraction peaks in a range of 20&#xb0;&#x3c;2&#x3b8;&#x3c;25&#xb0; as detected by X-ray diffraction measurement, and has a melting point which is 60&#xb0; C. or higher but lower than 80&#xb0; C., and wherein the diffraction peaks each have a half width which is less than 1.0&#xb0;.

Toner containing crystalline polyester

A toner including: a binder resin containing a non-crystalline resin and a crystalline resin; a colorant; and, a releasing agent, wherein the releasing agent has a melting point of 55&#xb0; C. to 80&#xb0; C., and wherein the toner satisfies the following Expressions 1 and 2: (Expression 1): 20,000 Pa&#xb7;s&#x2266;G&#x2266;50,000 Pa&#xb7;s; and (Expression 2): (G/G)/(G/G) 1.00, where Gis a storage modulus, Gis a loss modulus, Gis a storage modulus and Gis a loss modulus, and the storage modulus Gand the loss modulus Gare measured at 80&#xb0; C. when the toner is heated from 70&#xb0; C. to 150&#xb0; C. and the storage modulus Gand the loss modulus Gare measured at 80&#xb0; C. when the toner heated to 150&#xb0; C. is cooled to 70&#xb0; C.

Toner, developer 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: toner base particles each containing a binder resin and a colorant; and an external additive containing inorganic particles and fatty acid metal salt particles, wherein the inorganic particles contain at least hydrophobic silica particles, wherein a liberation ratio Ya of the hydrophobic silica particles from the toner is 1% by mass to 20% by mass, and wherein a libration ratio Yb of the fatty acid metal salt particles from the toner is 30% by mass to 90% by mass.

Toner 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

To provide a toner, containing: a binder resin; a crystalline polyester resin; a colorant; and wax, wherein the toner has a fluidized powder characteristic value of 35% to 45%, and a BET specific surface area of 2.8 m/g to 4 m/g, and wherein the toner has an intensity ratio P2850/P828 of 0.10 to 0.20, where P2850 is an intensity of a peak at 2850 cmwhich is attributed from the wax and the crystalline polyester resin, and P828 is an intensity of a peak at 828 cmwhich is attributed from the binder resin, as measured by total reflectance infrared spectroscopy.

Toner, production method thereof, developer and image forming method

A toner containing toner particles, each toner particle containing: a releasing agent; a colorant; and a binder resin containing at least a crystalline polyester resin and a non-crystalline polyester resin, wherein in the case where a volume average particle diameter of the toner is defined as Dv, the toner contains a group of the toner particles having 4/5 Dv, and a group of the toner particles having 6/5 Dv, and wherein an endothermic value A of the crystalline polyester resin at a first temperature increase in DSC of the toner, an endothermic value B of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particle having 4/5 Dv, and an endothermic value C of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particles having 6/5 Dv satisfy the relation represented by the following formulas:50&#x3c;()&#xd7;100&#x3c;90, and110&#x3c;()&#xd7;100&#x3c;150.

Toner, developer, image forming method and image forming apparatus

A set of toners including yellow, cyan, magenta, and black toner, each of which containing a binder resin containing a crystalline resin and a non-crystalline resin, a releasing agent, and a corresponding coloring agent, wherein the following relationship is satisfied: 0.8&#x3c;EBk/EFc&#x3c;0.95, where EBk represents the amount of heat of melting (mJ/mg) for the black toner and EFc represents the average amount of heat of melting (mJ/mg) of the yellow toner, magenta toner, and cyan toner from 50&#xb0; C. to 100&#xb0; C. at the first temperature rising in differential scanning calorimetry (DSC).

Toner, process cartridge, and image forming apparatus

A toner including a core particle, an inner shell layer covering the core, and an outer shell layer covering the inner shell layer is provided. The core particle includes a resin P. The inner shell layer includes fine particles of a resin A. The outer shell layer includes fine particles of a resin B. The toner satisfies the following formulae (1) to (3):4.5&#x2266;&#xbd;()&#x2212;()&#x2266;14&#x2003;&#x2003;(1)20&#x2266;&#xbd;()&#x2212;()&#x2266;40&#x2003;&#x2003;(2)23.5&#x2266;&#xbd;()&#x2212;()&#x2266;40&#x2003;&#x2003;(3)wherein T&#xbd;(P), T&#xbd;(A), and T&#xbd;(B) represent &#xbd; method temperatures of the resins P, A, and B, respectively, and Tfb(P), Tfb(A), and Tfb(B) represent flow beginning temperatures of the resins P, A, and B, respectively, and wherein the &#xbd; method temperatures and the flow beginning temperatures are measured by a flowtester.

Toner

A toner containing a binder resin, a colorant, and a releasing agent, wherein the colorant contains a mixed crystal of a C. I. PIGMENT YELLOW 185 and a C. I. PIGMENT YELLOW 139, and wherein a mass ratio of the C. I. PIGMENT YELLOW 185 to the C. I. PIGMENT YELLOW 139 (mass of the C. I. PIGMENT YELLOW 185/mass of the C. I. PIGMENT YELLOW 139) in the toner is 95/5 to 50/50.

Toner, developer, and image forming method

A method of manufacturing a toner including forming a wax liquid dispersion in which a wax is dispersed in an organic solvent (A1), mixing an organic layer including the wax liquid dispersion, a binder resin and an organic solvent (A) to form an oil phase and dispersing and emulsifying the oil phase in an aqueous medium to obtain an emulsified liquid dispersion, wherein the aspect ratio average of the wax in the wax liquid dispersion is from 0.3 to 0.7 and the toner includes toner particles satisfying the following relationship (1) in an amount of 20% by number or smaller based on all toner particles: 0.5&#x3c;D2/D1, relationship (1), where D1 represents the major diameter (D1) of the toner and D2 represents the major diameter of the wax.

Method of manufacturing toner

The toner includes a binder resin; a colorant; and a release agent. The first inter-particle force Fp(A) of the toner, which is measured under an environmental condition of 23&#xb0; C. and 60% RH after the toner is pressed for 1 minute at 25&#xb0; C. under a compression stress of 15 kg/cm, is from 1.0&#xd7;10(N) to 1.0&#xd7;10(N). The difference (Fp(B)&#x2212;Fp(A)) between the second inter-particle force Fp(B) of the toner, which is measured under the environmental condition of 23&#xb0; C. and 60% RH after the toner is pressed for 1 minute at 50&#xb0; C. under a compression stress of 15 kg/cm, and the first inter-particle force Fp(A) is 0 (N) to 1.0&#xd7;10(N).

Toner, method for preparing the toner, and image forming method using the toner

A method for producing a toner, including: dispersing toner particles containing at least a binder resin in a first aqueous medium so as to produce an aqueous dispersion; and subjecting the aqueous dispersion to heat treatment, wherein the electric conductivity of the aqueous dispersion after the heat treatment is higher than the electric conductivity of the aqueous dispersion before the heat treatment by 50 &#x3bc;S/cm or less.

Method for producing toner, toner, and image forming method using the same

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Mishima, Japan

Osamu Uchinokura