Resin particles, each include amorphous polyester resins, a crystalline polyester resin, and a release agent. The amorphous polyester resins include (i) an amorphous polyester resin including a sulfonic acid salt group-containing polyester resin and (ii) an amorphous polyester resin different from the amorphous polyester resin including the sulfonic acid salt group-containing polyester resin. The sulfonic acid salt group-containing polyester resin has a solubility parameter of from 10 to 13. Each of the resin particles has a core-shell structure including a core layer and a shell layer. The shell layer includes the (i) amorphous polyester resin including the sulfonic acid salt group-containing polyester resin.

A toner is provided. The toner comprises a glittering pigment and a coloring pigment. The glittering pigment is disposed inside the toner. The coloring pigment comprises a yellow pigment comprising an isoindoline pigment.

A powder storage container is provided. The powder storage container includes a container body, a discharge port, a conveyer, a stirrer, a return port, and a partition wall. The container body is configured to contain powder. The powder contained in the container body is dischargeable through the discharge port. The conveyer is configured to convey the powder to the discharge port. The stirrer is configured to stir the powder contained in the container body by rotating. The return port is disposed outside a rotational locus of the stirrer in a radial direction, and the powder conveyed by the conveyer is returnable through the return port toward the stirrer. The partition wall is disposed between the stirrer and the return port with at least a part of the partition wall positioned above the return port.

A developing roller for an electrophotographic image forming apparatus, which conveys a developer, wherein the developing roller includes a developing sleeve and a member that generates a magnetic flux inside the developing sleeve, and the developing sleeve contains an aluminum alloy containing more than 0.6% by mass of silicon.

An image forming method uses a photoreceptor including at least an aluminum substrate, a toner for developing an electrostatic image including toner particles containing at least a binding resin, and a developer bearing member including a member that generates a magnetic flux inside, wherein the aluminum substrate contains silicon, a silicon content of the aluminum substrate is more than 0.6% by mass, and a glass transition point (Tg) of the toner for developing an electrostatic image is in a range of 0 to 45 C.

An image forming system includes, an electrostatic charge image developing toner; and a developing sleeve configured to convey the electrostatic charge image developing toner, wherein a toner particle included in the electrostatic charge image developing toner contains an amorphous polyester, the amorphous polyester is a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol, a content percentage of a structural unit derived from a bisphenol A derivative in the amorphous polyester is 10 mol % or less with respect to all structural units derived from the polyhydric alcohol, and the developing sleeve includes an aluminum alloy including more than 0.6% by mass of silicon.

Methods of coating powder coating compositions, particularly substrate powder coating compositions, and methods of making a substrate container, a portion thereof, or a closure for a container, and powder coating systems.

An external additive for a toner is described. An example external additive comprises tin oxide, aluminum oxide, and a silica-polymer composite.

An electrostatic charge image developing toner includes a carbodiimide compound and a polyester resin prepared by subjecting an alcohol component and a carboxylic acid component to condensation polymerization, wherein the alcohol component includes an aliphatic polyol in an amount of 60 mol % to 100 mol %.

An image forming apparatus includes a rotatable image bearing member, a charging member, a developing unit, a cleaning member, and a supply container. In an accommodating portion of a new developing unit, an initial developer which is a developer in a predetermined amount is filled in advance. The initial developer contains toner particles of which charge polarity is a predetermined polarity, and to the toner particles of the initial developer, lubricant particles of a polarity opposite in charge polarity to the predetermined polarity are externally added. A supply developer which is the developer accommodated in the supply container contains the toner particles. An external addition amount of the lubricant particles to the toner particles in the supply developer is smaller than an external addition amount of the lubricant particles to the toner particles in the initial developer.