Ricoh Company, Ltd.

Mio Kumai

Hideki Sugiura

Hiroshi Gotou

Takashi Watanabe

Tomohiro Inoue

Masayuki Koyano

Azumi Miyaake

Taku Hatakeyama

Kaoru Tadokoro

Sho Oyamatsu

Yuka Mizoguchi

Yuuki Mizutani

Mihoko Matsumoto

Ayano Momose

Yuri Haga

Kaori Miyahara

Takayuki Shimizu

Satoshi Kojima

Hiroki Kobayashi

Hiroki Hagiwara

Hidefumi Nagashima

Kiminori Masuda

Amika Sagara

Maiko Koeda

Hiroki Nakane

An ink contains a water-soluble organic solvent, a glittery pigment having a median size less than 300 nm, and a polycarbonate-based urethane resin.

Ink, image forming method, image forming device, and recorded matter

An ink set comprises black ink having a static surface tension A and yellow ink having a static surface tension B, wherein the static surface tension A is 28.7 mN/m or more and greater than the static surface tension B, wherein the ink set is used in an image forming device including an inkjet head including a nozzle plate including a first nozzle array and a second nozzle array disposed adjacent to the first nozzle array, the first nozzle array including multiple first nozzles configured to discharge the black ink and a second nozzle array including multiple second nozzles configured to discharge the yellow ink wherein each nozzle of the multiple first nozzles and the multiple second nozzles has a cylindrical portion having a length of 25 &#x3bc;m or longer along an axial direction with an opening on an ink discharging side of the nozzle plate.

Ink set and image forming device

A liquid discharge apparatus includes a conveyance path, a liquid discharge head, and a drying device. A medium is to be conveyed on the conveyance path. The liquid discharge head discharges liquid onto the medium conveyed on the conveyance path. The conveyance path includes a switchback path and an ejection path. The switchback path switches back a conveyance direction of the medium onto which the liquid has been discharged. The ejection path conveys the medium onto which the liquid has been discharged to an ejection port. The drying device dries the medium both on the switchback path and on the ejection path.

Liquid discharge apparatus

A liquid discharge apparatus includes a conveyance path, a liquid discharge head, an ejection tray, and a drying device. A medium is conveyed in the conveyance path. The liquid discharge head discharges liquid onto the medium conveyed in the conveyance path. The medium is ejected to the ejection tray. The drying device dries the medium. The conveyance path includes a first bending portion to bend the medium, with a liquid-applied surface of the medium facing inward. The ejection tray includes a second bending portion to bend the medium, with the liquid-applied surface of the medium facing inward. A curvature of the medium bent by the first bending portion is greater than a curvature of the medium bent by the second bending portion. The drying device dries the medium conveyed in the first bending portion.

An ink set comprises black ink having a static surface tension A and yellow ink having a static surface tension B, wherein the static surface tension A is by 0.6 mN/m or more greater than the static surface tension B, wherein the ink set is used in an image forming device including an inkjet head including a nozzle plate including a first nozzle array and a second nozzle array disposed adjacent to the first nozzle array, the first nozzle array including multiple first nozzles configured to discharge the black ink and a second nozzle array including multiple second nozzles configured to discharge the yellow ink, wherein each nozzle of the multiple first nozzles and the multiple second nozzles has a cylindrical portion having a length of 25 &#x3bc;m or longer along an axial direction with an opening on an ink discharging side of the nozzle plate.

An ink includes water, a coloring material, an organic solvent having a solubility parameter of from 8.0 to 13.0, an urethane resin particle and a metal ion, wherein the organic solvent having the solubility parameter of from 8.0 to 13.0 has a proportion of from 10.0% by mass to 30.0% by mass to the ink, where the metal ion is at least one selected from an alkali metal ion and an alkaline earth metal ion, where the metal ion has a proportion of from 4000 mg/L to 8000 mg/L to the ink.

Ink, ink container, recording device, recording set and recording method

An active-energy-ray-curable composition, a cured material of the active-energy-ray-curable composition satisfying a critical load of 5.0 g or more but 25.0 g or less, the critical load being obtained by a continuous loading test method using a variable normal load friction and wear measurement device, the cured material having an average thickness of 10 &#x3bc;m and being formed by coating the active-energy-ray-curable composition on a substrate and by irradiating and curing the active-energy-ray-curable composition with active energy rays having illuminance of 1.5 W/cmand an amount of irradiation of 200 mJ/cm.

Active-energy-ray-curable composition, active-energy-ray-curable ink, two-dimensional or three-dimensional image forming method, two-dimensional or three-dimensional image forming apparatus, and cured material

An active-energy-ray-curable composition including active-energy-ray-polymerizable compounds, wherein the active-energy-ray-polymerizable compounds include a monofunctional monomer, a bifunctional monomer, and a trifunctional monomer, and wherein the monofunctional monomer, the bifunctional monomer, and the trifunctional monomer satisfy conditions (1) and (2) below: (1) [number of functional groups derived from the monofunctional monomer]&#x3e;[number of functional groups derived from the bifunctional monomer]&#x3e;[number of functional groups derived from the trifunctional monomer]; and (2) a standard deviation of functional group ratios is from 0.003 through 0.030, the functional group ratios being expressed by [number of functional groups derived from N-functional monomer]/([number of functional groups derived from the monofunctional monomer]+[number of functional groups derived from the bifunctional monomer]+[number of functional groups derived from the trifunctional monomer]), the N being mono, bi, or tri.

Active-energy-ray-curable composition, active-energy-ray-curable ink, composition stored container, two-dimensional or three-dimensional image forming apparatus, two-dimensional or three-dimensional image forming method, cured material, and structure

Active-energy-ray-curable composition including: monofunctional monomers; and polymerization initiator, cured material of the composition satisfying 0.30&#x2266;D&#x2266;0.85, where D is difference between peak-area-ratios A and B in infrared-ATR and obtained by: the composition is coated on polycarbonate substrate to form coated film having average thickness of 10 &#x3bc;m; the film is irradiated with active energy rays having light quantity of 500 mJ/cmat UV intensity of 1.0 W/cmfor curing; the A is obtained from Formula (1) by infrared-ATR at one portion present from the cured material surface through 1 &#x3bc;m away therefrom toward the substrate, the B is obtained from Formula (1) by infrared-ATR at one portion present from the substrate-cured material interface through 1 &#x3bc;m away therefrom toward the cured material surface,Peak-area (from 1,679 mthrough 1,751 m/peak-area (from 1,096 mthrough 1,130 m)&#x2003;&#x2003;Formula (1), andthe A and B obtained are used to obtain D from Formula (2):=peak-area-ratio&#x2212;peak-area-ratio&#x2003;&#x2003;Formula (2).

Active-energy-ray-curable composition, active-energy-ray-curable ink, composition stored container, image forming method, image forming apparatus, cured material, and image formed matter

A toner, including a binder resin, a release agent, and a colorant, wherein a total amount of hydrocarbon compounds having 33 to 35 carbon atoms in the toner measured by ion attachment mass spectrometry (IAMS) is 40% to 70% in terms of a signal intensity ratio.

Toner, two-component developer, and color-image forming apparatus

Provided is [i] a toner including at least a colorant, a resin, and a releasing agent, wherein a spin-spin relaxation time (t) of the toner at 90&#xb0; C. obtained by Hahn Echo method of pulse NMR analysis is from 1.80 msec to 7.00 msec. Also provided is [ii] a toner according to [i], wherein the spin-spin relaxation time (t) of the toner at 90&#xb0; C. obtained by Hahn Echo method of pulse NMR analysis is from 3.80 msec to 5.90 msec.

Toner and two-component developer

A toner comprised of mother toner particles each including a colorant, a resin A capable of forming a crystalline structure, and a resin B incapable of forming a crystalline structure is provided. The resin A is dispersed in the resin B in the state of phase separation. The long axis of each dispersed particle of the resin A has a length of from 30 to 200 nm and the length ratio of the long axis to the short axis is from 2 to 15. The DSC endothermic quantity attributable to the resin A is from 8 to 20 J/g.

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

A toner, including: a colorant; and a binder resin, wherein a spreadability of the toner under a non-pressurized condition is 1.20 to 2.50, wherein a common logarithm of a storage modulus at 100&#xb0; C. (G') of the toner is 4.0 [log Pa] to 5.0 [log Pa], and wherein a ratio of a loss modulus at 100&#xb0; C. (G&#x2033;) to the storage modulus at 100&#xb0; C. (G&#x2032;) of the toner (G&#x2033;/G&#x2032;=tan &#x3b4;) is 1.1 to 2.2.

Toner, image forming apparatus, process cartridge, and developer

To provide a toner, which contains: a colorant; a resin; and a releasing agent, wherein a spin-spin relaxation time (T2s) originated from a soft component is 0.10 msec to 0.50 msec, where the soft component is obtained with a hard component from an echo signal of the toner by a solid-echo technique of pulsed NMR, and a proportion of a proton intensity of the soft component is 50.0% or lower.

Toner, image forming apparatus, image forming method, process cartridge, and two-component developer

A toner includes an amorphous resin; and a crystalline polyester resin dispersed in the amorphous resin. The crystalline polyester resin has a volume-average particle diameter (Dv) of from 0.07 to 0.20 &#x3bc;m, and a ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) thereof of from 1.00 to 2.25.

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Tokyo, Japan

Mio Kumai