Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluorine-containing particles. The fluorine-containing particles include a fluorine atom at least in surface layers thereof. The amount of the fluorine-containing particles is at least 0.10 parts by mass and no greater than 0.50 parts by mass relative to 100 parts by mass of the toner mother particles. When ultrasonication is performed, a residual amount ratio of remaining fluorine-containing particles is at least 0% by mass and no greater than 20% by mass relative to the amount of the fluorine-containing particles attached to the toner mother particles before the ultrasonication.

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles or indium tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 0.04 and no greater than 0.46.

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes first external additive particles and fluorine-containing particles. The first external additive particles each include an aluminum oxide particle, a conductive layer covering the aluminum oxide particle, and a single-layer or multilayer protective layer covering the conductive layer. The conductive layer contains antimony tin oxide. The protective layer includes a layer containing a component derived from a titanate coupling agent, or includes an inner layer containing methylol melamine, urethane resin, or aluminum hydroxide and an outer layer containing a component derived from a silane coupling agent. The first external additive particles have a powder specific resistance of no greater than 50 ?·cm.

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluorine-containing particles. The fluorine-containing particles include a fluorine atom at least in surface layers thereof. The amount of the fluorine-containing particles is at least 0.10 parts by mass and no greater than 0.50 parts by mass relative to 100 parts by mass of the toner mother particles. When ultrasonication is performed, a residual amount ratio of remaining fluorine-containing particles is at least 0% by mass and no greater than 20% by mass relative to the amount of the fluorine-containing particles attached to the toner mother particles before the ultrasonication.

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles or indium tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 4% by mass and no greater than 46% by mass.

Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluororesin particles. The fluororesin particles have a number average primary particle diameter of at least 100 nm and no greater than 300 nm. An area ratio of a region of the surface of the toner mother particle that is covered with the fluororesin particles is at least 0.70% and no greater than 2.20% in the surface of the toner mother particle.

Abstract: A toner contains toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive contains titanate compound particles doped with lanthanum and a group 5 element in the periodic table as external additive particles. The amount of the lanthanum is at least 1.50% by mass relative to the total mass of the titanate compound particles. The amount of the group 5 element in the periodic table is at least 0.01% by mass and no greater than 0.60% by mass relative to the total mass of the titanate compound particles.

Abstract: A toner contains toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive contains titanate compound particles doped with lanthanum and a group 5 element in the periodic table as external additive particles. The amount of the lanthanum is at least 1.50% by mass relative to the total mass of the titanate compound particles. The amount of the group 5 element in the periodic table is at least 0.01% by mass and no greater than 0.60% by mass relative to the total mass of the titanate compound particles.

Abstract: A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particle contains a binder resin and a wax. The external additive includes a plurality of antioxidant particles. Each of the antioxidant particles includes a base particle containing an antioxidant and having a surface treated with a surface treatment agent. The surface treatment agent has a first functional group and a second functional group in a molecule thereof. The first functional group has stronger positive chargeability than the base particle. The second functional group has stronger hydrophobicity than the base particle.

Abstract: A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particle contains a binder resin and a wax. The external additive includes a plurality of antioxidant particles. Each of the antioxidant particles includes a base particle containing an antioxidant and having a surface treated with a surface treatment agent. The surface treatment agent has a first functional group and a second functional group in a molecule thereof. The first functional group has stronger positive chargeability than the base particle. The second functional group has stronger hydrophobicity than the base particle.

Abstract: A toner includes a plurality of toner particles (10) each including a toner mother particle (11) and a plurality of external additive particles (12) attached to a surface of the toner mother particle (11). The external additive particles (12) each include a silica particles (12a), a metal hydroxide layer, and a coating layer (12b). The metal hydroxide layer is disposed on a surface of the silica particle (12a). At least a part of the coating layer (12b) is disposed on a surface of the metal hydroxide layer. The coating layer (12b) is made substantially from a nitrogen containing resin.

Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each having a toner core, a shell layer, and needle-like particles. The needle-like particles adhere to a surface of the toner core. The shell layer contains a thermosetting resin and covers the needle-like particles and the toner core. The needle-like particles contain titanium oxide. The needle-like particles have a volume resistivity value of at least 1.0×101 ?·cm and no greater than 1.0×108 ?·cm. The needle-like particles have a number average major-axis diameter of at least 0.2 ?m and no greater than 2.0 ?m. The needle-like particles have a number average minor-axis diameter of at least 0.01 ?m and no greater than 0.10 ?m.

Abstract: Electrostatic latent image developing toner includes at least a binder resin and a releasing agent. In the electrostatic latent image developing toner, a maximum thermal expansion coefficient difference (Swmax?Srmax), which is a difference between a maximum value (Swmax) of a thermal expansion coefficient of the releasing agent and a maximum value (Srmax) of a thermal expansion coefficient of the binder resin, is 1 or more, and a temperature at which the thermal expansion coefficient of the releasing agent reaches a maximum is 60° C. or more to 75° C. or less.

Abstract: A magnetic toner for developing an electrostatic latent image of the present disclosure includes toner particles each having a toner core containing a binder resin and a magnetic powder, and a shell layer coating a surface of the toner core. The shell layer contains a unit derived from a monomer of a thermosetting resin and a unit derived from a thermoplastic resin. The thermosetting resin is one or more resins selected from the group of amino resins consisting of a melamine resin, a urea resin, and a glyoxal resin. The amount of iron eluted from the toner core (iron concentration in a filtrate) measured by a specified method is 10 mg/L or less.

Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each having a toner core, a shell layer, and needle-like particles. The needle-like particles adhere to a surface of the toner core. The shell layer contains a thermosetting resin and covers the needle-like particles and the toner core. The needle-like particles contain titanium oxide. The needle-like particles have a volume resistivity value of at least 1.0×101 ?·cm and no greater than 1.0×108 ?·cm. The needle-like particles have a number average major-axis diameter of at least 0.2 ?m and no greater than 2.0 ?m. The needle-like particles have a number average minor-axis diameter of at least 0.01 ?m and no greater than 0.10 ?m.

Abstract: A magnetic toner for developing an electrostatic latent image of the present disclosure includes toner particles each having a toner core containing a binder resin and a magnetic powder, and a shell layer coating a surface of the toner core. The shell layer contains a unit derived from a monomer of a thermosetting resin and a unit derived from a thermoplastic resin. The thermosetting resin is one or more resins selected from the group of amino resins consisting of a melamine resin, a urea resin, and a glyoxal resin. The amount of iron eluted from the toner core (iron concentration in a filtrate) measured by a specified method is 10 mg/L or less.

Abstract: For electrostatic charge image developing toner including toner base particles including a binder resin and a releasing agent, and an external additive attached to the toner base particles, an ester wax including a carboxylic acid component and an alcohol component each having a specific composition is used as the releasing agent, and an endothermic start temperature of the releasing agent is a predetermined temperature or more.

Abstract: Electrostatic latent image developing toner includes at least a binder resin and a releasing agent. In the electrostatic latent image developing toner, a maximum thermal expansion coefficient difference (Swmax?Srmax), which is a difference between a maximum value (Swmax) of a thermal expansion coefficient of the releasing agent and a maximum value (Srmax) of a thermal expansion coefficient of the binder resin, is 1 or more, and a temperature at which the thermal expansion coefficient of the releasing agent reaches a maximum is 60° C. or more to 75° C. or less.

Abstract: A toner for electrostatic latent image development includes at least a binder resin, a colorant, a charge control agent, and a release agent. The release agent contains a synthetic ester wax and a natural ester wax. When a toner sample is measured by a differential scanning calorimeter in a way that the toner sample is heated from 30° C. to 170° C. at a rate of 10° C./min followed by cooling to 30° C. at a rate of 10° C./min and is then re-heated from 30° C. to 170° C. at a rate of 10° C./min, a fusion-starting temperature TB, a lower endothermic peak temperature T1 derived from one ester wax, an intermediate endothermic peak temperature T2, and a higher endothermic peak temperature T3 derived from another ester wax are respectively a certain temperature, and are observed during the re-heating.

Abstract: A silencer attenuating a noise from a noise source to be ventilated of this invention comprises a machine compartment with a one-dimensional duct configuration whose sectional dimension is sufficiently small in comparison with the wavelength of the noise to be attenuated, a compressor and/or other machinery disposed within the machine compartment, an opening for dissipation of heat as disposed in a wall of the machine compartment and opening in a direction generally perpendicular to the direction of advance of sound within the machine compartment, a vibration pickup for detecting the vibration of the machinery corresponding to the output noise of the machinery, and a control circuit for processing output signals from the vibration pickup to drive a sound generator such as a speaker. The sound generator outputs a controlling signal dependent on the machine noise to cancel the noise about to emerge from the machine compartment.