Abstract: An image forming apparatus has a photosensitive member configured to transport a developer containing a compound that causes cis-trans isomerization reaction by light absorption to induce phase transition; a first exposure device configured to emit ultraviolet light having a wavelength of 300 nm-400 nm to a developer image; and a pressing member configured to press a recording sheet holding a developer image exposed by the first exposure device thereon. It is possible to achieve conservation of energy during image formation.

Abstract: An image forming apparatus has a photosensitive member configured to transport a developer containing a compound that causes cis-trans isomerization reaction by light absorption to induce phase transition; a first exposure device configured to emit ultraviolet light having a wavelength of 300 nm-400 nm to a developer image; and a pressing member configured to press a recording sheet holding a developer image exposed by the first exposure device thereon. It is possible to achieve conservation of energy during image formation.

Abstract: There is provided a toner, including toner mother particles which contain a binder resin, a colorant, and a wax, wherein a difference between a density of the wax in a solid state and a density of the wax in a liquid state is not less than 0.11 g/cm3; the density of the wax in the liquid state is not more than 0.835 g/cm3; and a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg.

Abstract: There is provided a toner block, which is formed by preparing a toner suspension in which toner particles are dispersed in water so that a water amount is 32.5 to 37% by mass; absorbing water contained in the toner suspension by a water absorptive material which absorbs 0.2 ml of water within 3 minutes to prepare an aggregate of the toner particles containing water of not more than 32.3% by mass; and drying the aggregate, and which has a maximum compressive stress of 80000 to 550000 N/m2 upon collapse.

Abstract: There is provided a toner, including toner mother particles which contain a binder resin, a colorant, and a wax, wherein a difference between a density of the wax in a solid state and a density of the wax in a liquid state is not less than 0.11 g/cm3; the density of the wax in the liquid state is not more than 0.835 g/cm3; and a heat quantity of the wax per unit mass which is obtained from an endothermic peak area at a low temperature side measured by a differential scanning calorimetry is not less than 190 mJ/mg.

Abstract: There is provided a method for producing a toner block. The method includes: preparing a toner suspension in which toner particles are dispersed in water so that the toner suspension is a dilatant fluid; preparing an aggregate of the toner particles in a form of cake by absorbing water contained in the toner suspension by a water absorptive material; and drying the aggregate.

Abstract: Provided is a method for producing a toner having excellent particle size distribution and storage stability. The method set forth in the present specification is a method for producing a toner by aggregating and fusing base microparticles whose main component is a binder resin including anionic groups, wherein an aggregate is produced by aggregating the base microparticles in a base microparticle suspension, in a presence of a non-ionic surfactant such that a surface tension of an aqueous solution thereof is not lower than 45 mN/m at any concentration at or above a critical micelle concentration, and the toner is produced through fusion of the aggregate. According to this method, drops in a glass transition temperature of the toner can be curbed, and the toner having excellent storage stability and good particle size distribution can be obtained.

Abstract: A developing apparatus is described. The developing apparatus includes a transport member including a plurality of electrodes forming a traveling wave electric field by successively applied voltages and a casing storing a toner transported by the transport member, wherein the activity of the toner based on the following measuring method shown in (1) to (3) is not more than 2.

Abstract: There is provided a method for producing a toner block. The method includes: preparing a toner suspension in which toner particles are dispersed in water so that the toner suspension is a dilatant fluid; preparing an aggregate of the toner particles in a form of cake by absorbing water contained in the toner suspension by a water absorptive material; and drying the aggregate.

Abstract: There is provided a toner block, which is formed by preparing a toner suspension in which toner particles are dispersed in water so that a water amount is 32.5 to 37% by mass; absorbing water contained in the toner suspension by a water absorptive material which absorbs 0.2 ml of water within 3 minutes to prepare an aggregate of the toner particles containing water of not more than 32.3% by mass; and drying the aggregate, and which has a maximum compressive stress of 80000 to 550000 N/m2 upon collapse.

Abstract: Provided is a method for producing a toner including the steps of: preparing a resin liquid by mixing at least a binder resin made of polyester resin and a colorant with an ester organic solvent represented by the following general formula (1); dispersing the resin liquid in an aqueous medium to form an emulsion; and removing the ester organic solvent from the emulsion to produce a toner, in which the ester organic solvent before the preparation of the resin liquid contains water in an amount of not less than 1% by weight and up to the saturation solubility at 25° C. to the ester organic solvent: (in which R1 is a hydrogen atom or a methyl group, and R2 is an alkyl group having 1 to 4 carbon atoms).

Abstract: A method for producing a positively chargeable toner is described. The method for producing a positively chargeable toner may include the steps of: mixing and emulsifying a charge-controlling resin having a positive polar group, an organic solvent and an aqueous medium to form an emulsion, and then removing the organic solvent from the emulsion, to thereby form a suspension of the charge-controlling resin having a positive polar group in the range of 5.0×10?5 to 6.0×10?4 mol/g; mixing the suspension of the charge-controlling agent with a suspension of toner base particles containing a binder resin and a colorant, to thereby form a mixture; and heating the mixture containing the suspension of the toner base particles and the suspension of the charge-controlling resin, to thereby fix the charge-controlling resin on the surfaces of the toner base particles.

Abstract: Provided is a method for producing a toner having excellent particle size distribution and storage stability. The method set forth in the present specification is a method for producing a toner by aggregating and fusing base microparticles whose main component is a binder resin including anionic groups, wherein an aggregate is produced by aggregating the base microparticles in a base microparticle suspension, in a presence of a non-ionic surfactant such that a surface tension of an aqueous solution thereof is not lower than 45 mN/m at any concentration at or above a critical micelle concentration, and the toner is produced through fusion of the aggregate. According to this method, drops in a glass transition temperature of the toner can be curbed, and the toner having excellent storage stability and good particle size distribution can be obtained.

Abstract: In a toner production method, a volatile solvent gas is jetted into a dispersion of aggregated resin particles where at least resin particles dispersed in a continuous phase are aggregated. A form of the aggregated resin particles is controlled by jetting the volatile solvent gas into the dispersion of aggregated resin particles. The volatile solvent is removed from the form-controlled aggregated resin particles.

Abstract: The present teachings provide a method for producing a yet superior toner by emulsification aggregation. The method for producing toner by emulsification aggregation comprises the following steps (a) and (b): (a) preparing primary base particles through aggregation and fusion of base microparticles obtained by emulsifying and dispersing a binder resin of the toner; and (b) producing secondary base particles by aggregating the primary base particles with the base microparticles.

Abstract: Provided is a method for producing a toner including the steps of: preparing a resin liquid by mixing at least a binder resin made of polyester resin and a colorant with an ester organic solvent represented by the following general formula (1); dispersing the resin liquid in an aqueous medium to form an emulsion; and removing the ester organic solvent from the emulsion to produce a toner, in which the ester organic solvent before the preparation of the resin liquid contains water in an amount of not less than 1% by weight and up to the saturation solubility at 25° C. to the ester organic solvent. (in which R1 is a hydrogen atom or a methyl group, and R2 is an alkyl group having 1 to 4 carbon atoms).

Abstract: Methods are described for rendering toner particles that are capable of being sufficiently and uniformly charged. The particles may be positively chargeable, non-magnetic, single component toner particles. At least one production method includes emulsifying a charge-controlling agent formed of a synthetic resin in an aqueous medium, the charge-controlling agent having been dissolved in or swollen with an organic solvent; removing the organic solvent; mixing with a suspension of toner base particles containing a binder and a colorant; and heating to fix the charge-controlling agent on the surfaces of the toner base particles. According to at least one method, a positively chargeable non-magnetic single component toner can be produced such that the amount of the charge-controlling agent deposited on the surfaces of the toner base particles falls within a range of 0.2 to 3.0 wt. %, with respect to the total weight of the toner.

Abstract: A method for producing toner is described. In the method for producing a toner, a resin liquid is prepared by mixing at least a binder resin made of polyester resin and a colorant with an organic solvent, the resin liquid is dispersed in an aqueous medium to form an emulsion, and the organic solvent is removed from the emulsion to produce a toner. The organic solvent before preparation of the resin liquid contains 5 to 20 parts by weight of water per 100 parts by weight of the organic solvent.

Abstract: A developing apparatus is described. The developing apparatus includes a transport member including a plurality of electrodes forming a traveling wave electric field by successively applied voltages and a casing storing a toner transported by the transport member, wherein the activity of the toner based on the following measuring method shown in (1) to (3) is not more than 2.

Abstract: A method for producing a toner is described. The method for producing a toner may include the steps of: preparing a resin solution by mixing a binder resin, a colorant and a wax into an organic solvent; preparing an emulsion by heating the resin solution and an aqueous medium to a temperature of not less than a level allowing the wax to dissolve and less than the boiling point of the organic solvent, and mixing the resin solution and the aqueous medium with each other; and preparing a suspension by removing the organic solvent from the emulsion, and aggregating and fusing the suspension.