Ricoh Company, Ltd.

Sanyo Chemical Industries, Ltd.

Yasuaki Iwamoto

Yasuo Asahina

Satoshi Mochizuki

Shinya Nakayama

Hideki Sugiura

Tomoyuki Ichikawa

Hiroto Higuchi

Fumihiro Sasaki

Koichi Sakata

Hiroaki Matsuda

Hiroshi Nakai

Akihiro Kotsugai

Yasutada Shitara

Hisashi Nakajima

Maiko Kondo

Masami Tomita

Yohichiroh Watanabe

Osamu Uchinokura

Kazuhiko Umemura

Masayuki Ishii

Toshiki Nanya

Masanori Suzuki

Naohito Shimota

Minoru Masuda

Masahide Yamashita

Hiroyuki Fushimi

Takahiro Honda

Hiroshi Yamada

Shigeru Emoto

Junichi Awamura

Hiroshi Yamashita

Kazumi Suzuki

Satoshi Kojima

Naohiro Watanabe

Masaki Watanabe

Hitoshi Iwatsuki

Shinichiro Yagi

Tsunemi Sugiyama

Tomomi Suzuki

Kohki Katoh

Mitsuo Aoki

Tomio Kondou

Nobuyasu Makino

Yoshihiro Norikane

Hiroyuki Kishida

Takuya Saito

Tsuneyasu Nagatomo

Tomoko Utsumi

Bing Shu

Kumi Hasegawa

Kazuyuki Yazaki

Ryoichi Ito

Hyo Shu

Nobuhiro Nakayama

Akemi Sugiyama

Kazuhito Watanabe

Tadao Takikawa

Noboru Kuroda

Toshihiko Kinsho

Kenichi Uehara

Hidetoshi Noda

Yoshihiro Sugiyama

Yasushi Nakamura

Mitsuyoshi Izu

Tomotsugu Miyamoto

Kohichi Sakata

Takeshi Takada

Masana Shiba

Satoru Miyamoto

Takayuki Koike

Hiroshi Yaguchi

Shuhei Yahiro

Yasushi Koichi

Keiko Shiraishi

Shinji Ohtani

Yoshihiro Suguro

Tomomi Tamura

Sayuri Kojima

Hiroyuki Yoshikawa

Takahiro Kadota

Yousuke Suzuki

Kayo Makita

Yasuyuki Sanui

Yutaka Yoshida

Hyou Shu

Sayaka Yuasa

Tadao Sanyo Chemical Industries Ltd Takikawa

Hidetoshi Sanyo Chemical Industries Ltd Noda

Toshihiko Sanyo Chemical Industries Ltd Kinsho

Shuhei Sanyo Chemical Industries Ltd Yahiro

Naohito Bell Shine Takehara A-103 Shimota

Tomoyuki Dai6 Sumika Bldg 206 Ichikawa

Koichi Takashimahoncho M's 503 Sakata

A toner, wherein the toner is obtained by washing a toner particle dispersion liquid which is obtained by adding cellulase to a dispersion slurry, and the dispersion slurry is obtained from a dispersion liquid or an emulsion of a toner material-containing oil phase in an aqueous medium, and wherein the dispersion liquid or the emulsion contains a cellulosic dispersion stabilizing agent.

Toner and method for producing toner

An electrostatic image developing toner including: a binder resin; a colorant; and a wax, wherein the intensity ratio of an absorbance at 2,850 cmderived from the wax to an absorbance at 828 cmderived from the binder resin, represented by 'absorbance derived from the wax/absorbance derived from the binder resin', is in the range of 0.1 to 0.5, where the absorbances are measured by FTIR-ATR, and the intensity ratio serves as a value for determining the amount of the wax present within 0.3 &#x3bc;m in depth from surfaces of particles of the toner after the toner has been heated to 140&#xb0; C. and then cooled, and wherein the toner has a storage elastic modulus of 5,000 Pa or greater at 140&#xb0; C.

Electrostatic image developing toner

A toner is provided including a mother toner including a crystalline polyester resin, an amorphous resin, and a wax, and an external additive in an amount of from 0.30 to 0.55 parts by weight based on 100 parts by weight of the mother toner. The toner satisfies the following equation 0.36&#x2266;(2.77&#xd7;C/R+1.97&#xd7;W/R)/X&#x2266;1.85, wherein each of C, W, and R represents a height of an absorbance peak specific to the crystalline polyester resin, the wax, and the amorphous resin, respectively, measured by a FT-IR ATR method, and X represents an amount (parts by weight) of the external additive. An image forming method and apparatus using the toner are also provided.

Image forming method, image forming apparatus, and toner

The present invention provides a toner which includes at least a binder resin, and a colorant, wherein the toner has a concentration of radioactive carbon isotope C-14 of 10.8 pMC or higher.

Toner, developer, and image forming method

A method for manufacturing a toner, including: dissolving or dispersing toner constituents including a resin, a colorant, a release agent, and a graft polymer including a polyolefin resin unit and a vinyl resin unit in a solvent, to prepare a toner constituent liquid; supplying the toner constituent liquid to a retention part configured to retain the toner constituent liquid; discharging the toner constituent liquid from the retention part to a granulation space through plural holes arranged on the retention part, while exciting the toner constituent liquid by a vibration means in contact with a part of the retention part, so that the discharged columnar toner constituent liquid is constricted to form liquid droplets; and converting the liquid droplets into solid toner particles; together with a toner manufactured by the above method.

Method for manufacturing toner and toner

An image forming apparatus including a fixing device to fix a toner image on a recording medium including a heat roller and an oil applicator to apply a silicone oil to the heat roller, having a system speed of from 500 to 1700 mm/sec, and using a toner including a binder resin including a crystalline polyester resin and an amorphous polyester resin; a fatty acid amide compound; and a colorant, wherein a ratio (W/R) of a height (W) of a peak at a wavenumber of 1638 cm, specific to the fatty acid amide compound, to a height (R) of a peak at a wavenumber of 829 cm, specific to the amorphous polyester resin, is from 0.010 to 0.040 in an absorption spectrum obtained by an ATR method (total reflectance method) using a Fourier transform infrared (FT-IR) spectrophotometer.

Image forming apparatus, toner, and process cartridge

A toner that is excellent in low-temperature fixing property, offset resistance, storage stability, charge rising property, charge stability with time and pulverizability and allows for forming high-quality images over a long period of time. The toner contains at least a binder resin, a colorant and a charge controlling agent, wherein the charge controlling agent contains an aromatic oxycarboxylic acid metal compound having a trivalent or more central metal, the binder resin comprises a polyester resin (A) having a softening point Tm (A) of 120&#xb0; C. to 160&#xb0; C. and a polyester resin (B) having a softening point Tm (B) of 80&#xb0; C. to less than 120&#xb0; C., and at least any one of the polyester resins (A) and (B) contains 1,2-propane diol at 65 mol % or more in a divalent alcohol component and can be obtained by condensation polymerizing an alcohol component substantially composed of only an aliphatic alcohol with a carboxylic acid component.

Toner, image forming apparatus using the same, image forming method using the same, and process cartridge

An image forming method including electrostatic image forming step, developing step, transferring step, fixing step and oil application step for applying an oil to a fixing member, wherein the toner includes a binder resin, a colorant and a wax, and the relationship (A2/A1)&#xd7;100&#x3c;200 is satisfied, wherein A1 represents the area of the oil dropped on a pellet of the toner measured 30 seconds after dropping the oil, and A2 represents the area of the dropped oil measured 24 hours after dropping the oil. Alternatively, the relationships (X1&#x2212;X2)&#x3c;0.5 atomic percent, X1&#x3e;1.0 atomic percent, and X2&#x3e;1.0 atomic percent, are satisfied, wherein X1 and X2 represent amounts of Si atoms of the silicone oil measured by subjecting the toner image to X-ray photoelectron spectroscopy at times 5 minutes and 24 hours, respectively, after fixing the toner image.

Electrophotographic image forming method

Provided are image forming apparatuses, image forming methods, and process cartridges using a toner that is excellent in low temperature fixing ability, hot offset resistance, and storage stability, and also generate less odor, and thus that can provide high quality images with superior fixing ability, far from tone change with time, and less likely to occur abnormal images such as density-drop and background smear. The image forming apparatuses comprise a latent electrostatic image bearing member, a charging unit, an exposing unit, a developing unit, a transfer unit, and a fixing unit, wherein the toner comprises a binder resin and a colorant, the binder resin comprises a polyester resin prepared by condensation polymerization between an alcohol component that contains an aliphatic polyvalent alcohol and a carboxylic acid component that contains (meth)acrylic acid-modified rosin.

Image forming apparatus, image forming method and process cartridge

To provide an image forming apparatus including: a latent electrostatic image bearing member; a charging unit configured to charge the surface of the latent electrostatic image bearing member; an exposing unit configured to expose the charged surface of the latent electrostatic image to form a latent electrostatic image thereon; a developing unit configured to develop the latent electrostatic image with a toner to form a visualized image; a transferring unit configured to transfer the visualized image onto a recording medium; and a fixing unit configured to fix the visualized image transferred onto the recording medium, wherein the toner includes a binder resin and a coloring agent, and the binder resin includes a polyester resin obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid modified rosin.

Image forming apparatus, image forming method, and process cartridge

Provided is a toner that comprises a binder resin, a releasing agent, and a colorant, wherein the mass average particle diameter of the toner is 3 &#x3bc;m to 8 &#x3bc;m, the content of particles having a particle diameter of no more than 5 &#x3bc;m is from 60% by number to 90% by number, the binder resin comprises a polyester resin (A) having a softening temperature Tm(A) from no lower than 120&#xb0; C. to no higher than 160&#xb0; C. and a polyester resin (B) having a softening temperature Tm(B) from no lower than 80&#xb0; C. to lower than 120&#xb0; C., and at least one of the polyester resins (A) and (B) is prepared by condensation polymerization between an alcohol component and a carboxylic acid component, and the alcohol component comprises divalent alcohol of 1,2-propanediol in a content of no less than 65% by mole and consists substantially of aliphatic alcohol; and also provided is a developer that comprises the toner and a carrier.

Toner and developer, and image forming apparatus, image forming method and process cartridge

A toner including toner particles including a binder resin, a colorant, and an inorganic particulate material present on a surface of the toner particles. The toner particles have a surface roughness (Ra) of from 1 to 30 nm, a standard deviation of the surface roughness of from 10 to 90 nm and include 1 to 20 convexities per 1 &#x3bc;m, which have a height not less than 10 nm.

Toner, developer, image developer and image forming apparatus

To provide an image forming apparatus, image forming method and process cartridge, which are excellent in low-temperature fixation properties, storage stability, durability and filming resistance, can reduce generation of odor, and are capable of forming an extremely high quality image. The apparatus includes: a latent electrostatic image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a fixing unit; wherein the toner comprises a binder resin and coloring agent, and the binder resin comprises a polyester-based resin (A) and polyester-based resin (B) having a melting point at least 10&#xb0; C. higher than that of the polyester-based resin (A), and at least one of the polyester-based resins (A) and (B) is a resin derived from a (meth)acrylic acid modified rosin and includes a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid modified rosin.

To provide an image forming apparatus including a latent electrostatic image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a fixing unit, wherein the binder resin of a toner comprises a polyester-based resin (A) and a polyester-based resin (B) having a melting point which is at least 10&#xb0; C. higher than that of the polyester-based resin (A), the polyester-based resins (A) is a resin which is derived from a (meth)acrylic acid-modified rosin and which has a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid-modified rosin, and the polyester-based resin (B) is a resin derived from a fumaric acid/maleic acid-modified rosin and has a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing any one of a fumaric acid-modified rosin and a maleic acid-modified rosin.

A toner including a binder resin; and a colorant, wherein a hexafluoroisopropanol (HFIP)-soluble component satisfies the following relationship:2,000 &#x2266;Mn &#x2266;7,000 and 1.5 &#x2266;Mn/Mw &#x2266;10

Toner, developer, image forming apparatus and image forming method

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Numazu, Japan

Yasuaki Iwamoto