Abstract: An object is to obtain a white ink which is easy to redisperse and is redispersible by being shaken several tens of times with weak force at most, or alternatively, without being shaken. As a solution, a white ink composition is provided which contains 5.0 to 20.0% by mass of a titanium oxide in an ink composition; 3.0 to 60.0 parts by mass of a solid content of alkali-soluble resin relative to 100 parts by mass of a pigment or pigments in the ink composition, wherein building blocks of the alkali-soluble resin are styrene; stearyl acrylate and/or lauryl acrylate; and acrylic acid, and the alkali-soluble resin has a weight-average molecular weight of 10,000 or more, an acid value of 100 mgKOH/g or more, and a glass transition temperature of 50° C. or more; and a surfactant.

Abstract: A cleaning fluid used in an ink-jet printer ejecting an aqueous ink-jet ink containing a pigment and an alkali-soluble resin, to clean a portion of the ink-jet printer to which the ejected aqueous ink-jet ink is adherent. The cleaning fluid includes a surfactant, an antiseptic, and water. The surfactant is a compound having a polyoxyalkylene skeleton and an HLB of 9-20, and the antiseptic includes a compound having a hydantoin skeleton, the content of which is 0.05-0.3 mass %. The cleaning fluid does not attack nozzle plates made of silicone and has satisfactory storage stability, antiseptic effect, and ability to remove aqueous ink-jet inks.

Abstract: An aqueous inkjet ink composition containing a pigment, an alkali-soluble resin, a surfactant, a water-soluble solvent, colloidal silica, and water, in which the surfactant includes a surfactant having an HLB value equal to or greater than 3 and less than 10 and a surfactant having an HLB value of 10-20 (inclusive), the water-soluble solvent has a boiling point of 170-250° C. (inclusive) at 1 atm, and the percentage of the colloidal silica in the aqueous inkjet ink composition is 0.05-2 mass % (inclusive). The aqueous inkjet ink composition has excellent storage stability, mechanical stability, discharge stability, coating film drying properties, and cissing resistance.

Abstract: An object is to provide a method for storing or transporting an aqueous white ink composition for inkjet that does not cause precipitation of a pigment therein during storage for a long period or transport, and allows the pigment to be easily redispersed even if precipitation occurs. As means for solving the problems, a storing method is provided that includes placing an aqueous white ink composition for inkjet containing titanium oxide and a pigment dispersant in a tank and maintaining the entire aqueous white ink composition for inkjet in the tank at a temperature of ?5 to ?35° C.

Abstract: A primer composition including a resin emulsion, an aggregation accelerator, a surfactant, and water, the surfactant containing one or more of acetylene-based surfactants and silicone-based surfactants, and a nonionic surfactant other than the surfactant, the nonionic surfactant having an HLB value of 10 or above and below 15.5 and having multiple polyoxyalkylene groups, and the proportion of the nonionic surfactant in the primer composition is 3 mass % or below. The primer composition has excellent storage stability and makes it possible to form a primer layer that has excellent transparency and that produces excellent bleeding resistance and printability when a solid image is printed by an aqueous inkjet ink composition.

Abstract: A liquid developer for electrophotography or electrostatic recording is obtained by dispersing, in an insulating solvent, colored resin particles obtained according to the coacervation method from at least a pigment, pigment dispersion agent and binder resin, wherein the insulating solvent has been mixed in such a way that aliphatic hydrocarbon solvent having 11 to 12 carbon atoms accounts for 8.0 to 20.0 percent by mass, and aliphatic hydrocarbon solvent having 17 to 30 carbon atoms accounts for 2.0 to 45.0 percent by mass, and a total of these aliphatic hydrocarbon solvents having 11 to 30 carbon atoms accounts for 99 percent by mass or more, relative to the total mass of insulating solvent, and also in such a way that the viscosity of the insulating solvent at 25° C. becomes 2.0 to 10.0 mPa·s.

Abstract: An object of the present invention is to provide a liquid developer for electrophotography or electrostatic recording, demonstrating good particle uniformity, preservation stability, fixing property, and electrophoretic migration property. To achieve the aforementioned object, the present invention provides a liquid developer that contains colored resin particles granulated by utilizing the coacervation method, from at least an acid carbon black as pigment, binder resin containing acid group-containing resin, basic group-containing pigment dispersion agent, pigment dispersion aid which is an acid pigment derivative and accounts for 0.1 to 10.0 parts by mass per 100 parts by mass of the pigment, and granulating aid, wherein the colored resin particles are dispersed in an insulating solvent by means of a particle dispersion agent.

Abstract: A liquid developer for electrophotography or electrostatic recording includes colored resin particles, which are constituted by at least a pigment, a binder resin containing acid group-containing resin, a basic group-containing pigment dispersion agent, and a granulating aid, with the colored resin particles formed in an insulating solvent by utilizing the coacervation method. A carbodiimide compound having at least one carbodiimide group is used as the granulating aid, with the ratio of the number of active hydrogens in the acid group-containing resin to the number of carbodiimide groups in the carbodiimide compound adjusted to 1:0.01 or more but less than 1:1.00, and the colored resin particles are dispersed in the insulating solvent by a particle dispersion agent. The liquid developer has good uniformity, preservation stability, fixing property, and electrophoretic migration property of particles.

Abstract: A motor current detecting device includes a first wire, an instantaneous current detecting unit, an average electric current detecting unit, and a calculation unit. The first wire is configured and arranged to carry flow of a motor current that has been passed through a motor and a drive current that has been passed through a motor drive unit to drive the motor. The instantaneous current detecting unit is configured and arranged to detect an instantaneous value for a sum of the motor current and the drive current flowing on the first wire. The average electric current detecting unit is configured and arranged to detect an average value of the sum of the motor current and the drive current flowing on the first wire. The calculation unit is configured to calculate the motor current on the basis of the instantaneous value and the average value.

Abstract: The present invention provides a method for producing a liquid developer for electrophotography or electrostatic recording obtained by a coacervation method, which sufficiently maintains the charging property and has good dispersion stability of colored resin particles, as well as a liquid developer obtained by the method. A method for producing a liquid developer by a coacervation method, wherein a colored resin particle is dispersed in an insulating hydrocarbon dispersion medium in the presence of a particle dispersant and an acid group-containing resin, and the particle dispersant is a reaction product of a polyamine compound and a self-condensation product of a hydroxycarboxylic acid.

Abstract: Triggered by a position detection sensor detecting that a rotor is positioned at any one of K predetermined electrical angles, for example, 60°, 180°, and 300°, a voltage vector to be given to a motor is updated. When, for example, the rotation frequency is equal to or higher than a specified value, the predetermined electrical angles is changed into M, for example, into one angle of 60°.

Abstract: A current detecting device includes a current leveling unit, a first wire and a current detecting unit. The current leveling unit is configured to level a drive current that is passed through a motor drive unit to drive a motor. The first wire is configured and arranged to carry flow of a motor current that has been passed through the motor and the drive current that has been leveled by the current leveling unit. The current detecting unit is configured to detect a sum of the motor current flowing on the first wire and the drive current that has been leveled flowing on the first wire.

Abstract: Production process for a liquid developer for use in electrophotograph or electrostatic recording by coacervation method. The process can produce a liquid developer in which a coloring agent (e.g., a pigment) is included completely within a resin particle by distillation of a solvent while retaining the state where the coloring agent is finely dispersed and the resulting colored resin particle is small in particle size with excellent dispersion stability, and excellent optical properties.

Abstract: An object of the present invention is to provide a carbodiimide type compound having high dispersibility and dispersion stability of pigments, fine resin particles, and pigment-resin composite fine particles particularly in a silicone dispersion medium; a pigment dispersion composition and a pigment-resin composite fine particles-containing dispersion composition preferably usable in a wide range of fields such as inks for solvent ink jet, liquid developers, and the like by using the compound; and a liquid developer using such a pigment dispersion composition and/or pigment-resin composite fine particles-containing dispersion composition. The present invention provides a carbodiimide type compound obtained by introducing a polysiloxane chain by reaction of a functional group of a polysiloxane chain-containing compound having the functional group reactive with a carbodiimide group with a carbodiimide group of a carbodiimide compound having a carbodiimide equivalent weight of 100 to 50000.

Abstract: A boot capacitor that functions as an operating power supply for a high-arm-side transistor provided in an inverter has to be charged prior to normal operation of a motor. This operation of charging the boot capacitor is performed at a carrier frequency that is lower than a carrier frequency for the normal operation.

Abstract: Two current threshold values are adopted, which are larger than the upper limit of current of an operating region. When a rotating speed is smaller than a speed threshold value, the current threshold value is adopted as a criterion to judge whether an input current to an inverter is abnormal, and when the rotating speed Rot is larger than that, the other current threshold value is adopted as the criterion.

Abstract: Triggered by a position detection sensor detecting that a rotor is positioned at any one of K predetermined electrical angles, for example, 60°, 180°, and 300°, a voltage vector to be given to a motor is updated. When, for example, the rotation frequency is equal to or higher than a specified value, the predetermined electrical angles is changed into M, for example, into one angle of 60°.

Abstract: The present invention provides a method for producing a liquid developer for electrophotography or electrostatic recording obtained by a coacervation method, which sufficiently maintains the charging property and has good dispersion stability of colored resin particles, as well as a liquid developer obtained by the method. A method for producing a liquid developer by a coacervation method, wherein a colored resin particle is dispersed in an insulating hydrocarbon dispersion medium in the presence of a particle dispersant and an acid group-containing resin, and the particle dispersant is a reaction product of a polyamine compound and a self-condensation product of a hydroxycarboxylic acid.

Abstract: A motor current calculation device includes a first wire, a current detecting unit, a decision unit, and a calculation unit. The first wire is configured and arranged to carry flow of a motor current that has been passed through a motor and a drive current that has been passed through a motor drive unit to drive the motor. The current detecting unit is configured and arranged to detect a sum of the motor current and the drive current flowing through the first wire. The decision unit is configured and arranged to determine a first detection result of the current detecting unit when the motor is not rotating as the drive current. The calculation unit is configured to calculate the motor current by subtracting the drive current determined by the decision unit from a second detection result of the current detecting unit when the motor is rotating.

Abstract: A motor current detecting device includes a first wire, an instantaneous current detecting unit, an average electric current detecting unit, and a calculation unit. The first wire is configured and arranged to carry flow of a motor current that has been passed through a motor and a drive current that has been passed through a motor drive unit to drive the motor. The instantaneous current detecting unit is configured and arranged to detect an instantaneous value for a sum of the motor current and the drive current flowing on the first wire. The average electric current detecting unit is configured and arranged to detect an average value of the sum of the motor current and the drive current flowing on the first wire. The calculation unit is configured to calculate the motor current on the basis of the instantaneous value and the average value.