Abstract: A method for preserving an ink-jet, including a step of: keeping the ink-jet ink in a sealed container having a ratio of water of 1.50 to 5.00 weight % measured with Karl-Fischer method in an inside portion of the sealed container, wherein the ink-jet ink includes a cationic polymerizable monomer and an initiator, and the ink-jet ink is curable by irradiation with an active energy ray.

Abstract: An actinic ray curable ink composition, containing: (a) a photoinitiator; and (b) a photopolymerizable compound, wherein the photoinitiator is an onium compound exhibiting a hydrophobicity value (log P(O/W)) of less than 1.0, P(O/W) being a partition coefficient of the onium compound between 1-octanol and water.

Abstract: Disclosed is an actinic ray curable ink-jet ink composition containing a photopolymerizable compound, a sulfonium salt (compound A) as a photoinitiator, which does not release benzene on actinic ray exposure, and a compound (compound B) as a sensitizing agent selected from the group consisting of (i) a polycyclic aromatic compound having a hydroxyl group, a substituted or unsubstituted aralkyloxy group or a substituted or unsubstituted alkoxy group, (ii) a carbazole derivative, and (iii) a thioxanthone derivative.

Abstract: An active ray curable ink-jet ink composition comprising a photo-induced acid generating agent containing an onium salt which does not generate benzene under active ray radiation, and a photopolymerizable compound containing a compound having an oxetane ring in the molecule.

Abstract: An active ray curable ink jet solventless ink contains: a bifunctional or higher acrylate compound having a structure expressed by general formula (1) in an amount of less than 35% by mass, and a monofunctional acrylate compound in an amount of 65% by mass or more: wherein the general formula (1) is -(—R—O—)n— where, R represents an alkyl group, and n represents an integer of 1 or larger.

Abstract: There is provided an image recording device which is compact, high in image recording efficiency, low in power consumption, and capable of recording a good image even on a recording medium made of a heat shrinkable material. In an image recording device 1 which records an image on a recording medium 4 by irradiating it with ultraviolet rays by an ultraviolet-ray irradiation device 20 to cure an ink, an ultraviolet light source comprises a light emitting diode which generates ultraviolet rays having an emission wavelength peak in a range between 305 and 375 nm and a maximum illuminance in a range between 40 and 1000 mW/cm2 on a surface of the recording medium.

Abstract: An actinic radiation curable composition, comprising a photo-acid generating agent selected from the group consisting of sulfonium represented by General Formulas (I)-(III).

Abstract: Disclosed are an actinic ray curable composition, an actinic ray curable ink, an image recording method, and an ink jet recording apparatus, the actinic ray curable composition containing a photo acid generator, and an oxetane compound I represented by the following formula 1, 1

Abstract: An ink-jet ink comprising a photopolymerizable compound, a photopolymerization initiator and a colorant, wherein the ink has a viscosity of 500 to 50,000 mPa·s at 25° C. and a viscosity of 3 to 30 mPa·s at 80° C.

Abstract: A method for preserving an ink-jet, comprising a step of: keeping the ink-jet ink in a sealed container having a ratio of water of 1.50 to 5.00 weight % measured with Karl-Fischer method in an inside portion of the sealed container, wherein the ink-jet ink comprises a cationic polymerizable monomer and an initiator, and the ink-jet ink is curable by irradiation with an active energy ray.

Abstract: The present invention relates to an ink-jet recording method comprising: jetting an active ray-hardenable ink from an ink-jet head onto a recording material; irradiating the jetted active ray-hardenable ink on the recording material with an active ray; and heating the jetted active ray-hardenable ink on the recording material, wherein the active ray-hardenable ink comprises an oxetane compound having one oxetane ring in the molecule and an oxetane compound having two or more oxetane rings in the molecule as a photo polymerizable compound.

Abstract: A printed mater prepared by jetted ink. The ink is hardened by irradiation of radiation or heat, and the ratio of total thickness of the ink layer to total thickness of the substrate is from 0.40 to 0.05.

Abstract: An ink-jet ink comprising a photopolymerizable compound, a photopolymerization initiator and a colorant, wherein the ink has a viscosity of 500 to 50,000 mPa·s at 25° C. and a viscosity of 3 to 30 mPa·s at 80° C.

Abstract: A silver halide light sensitive photographic material is disclosed, comprising a support and at least one hydrophilic colloid layer including a silver halide emulsion layer, wherein the hydrophilic colloid layer comprises a compound represented by the following formula. An image forming method by use thereof is also disclosed.

Abstract: A silver halide black-and-white photographic light sensitive material is disclosed, comprising a support provided on one side thereof photographic component layers comprising at least two, first and second silver halide emulsion layers and optionally a nonlight-sensitive hydrophilic colloidal layer, the first emulsion layer being provided closer to the support than the second emulsion layer, wherein two or more layers of the component layers, each contains a hydrazine compound; and a molar ratio of a total hydrazine content of all layer(s) closer to the support from the first emulsion layer which include the first emulsion layer to that of all layer(s) farther from the support than the first emulsion layer which include the second emulsion layer is 0.2 to 0.8.

Abstract: A silver halide photographic light-sensitive material comprises a support and provided thereon, a photographic component layer comprising a silver halide emulsion layer and a hydrophilic colloid layer other than the emulsion layer, wherein the photographic component layer contains a hydrazine derivative, a nucleation accelerating agent and polymer latex containing as a protective colloid a hydrophilic polymer having an average number molecular weight of 1,000 to 1,000,000 and having a solubility of not less than 0.1 g in 100 g of water at 20.degree. C., provided that the hydrophilic polymer is not gelatin.

Abstract: An accurately operated automotive power steering system comprises a housing, an input shaft, an output shaft, an angular displacement producing mechanism for producing an angular displacement between the input and output shaft according to the torque applied to the input shaft, a sensor for delivering an output corresponding to the angular displacement, and a motor for rotating the output shaft in response to the output from the sensor. One end surface of the input shaft has a tapering recessed surface at its center. Also, the bottom surface of the hole in the output shaft has a tapering recessed surface. A steel ball is sandwiched between these recessed surfaces. A compressed spring is further provided whose one end bears on the input shaft. The other end bears on the inner surface of the housing. The input shaft is pressed against the output shaft via the steel ball.

Abstract: In an electric power steering apparatus including an input shaft, an output shaft and an electric motor for imparting a steering torque to the output shaft, a torque sensor includes a torsion bar provided between the input shaft and the output shaft. A movable member converts the output of the torsion bar into an axial movement of the same. The axial movement varies an electrostatic capacitance formed between an end of the movable member and an electrode plate held stationary, and the variation of the capacitance is utilized for controlling the electric motor in driving the output shaft.