Developer, developer cartridge and image forming apparatus

摘要

A developer contains a resin material, a colorant, and a lubricant. The ratio of a weight part of the lubricant to a weight part of the colorant is in the range of 0.3 to 10.0. The colorant has a mean particle diameter in the range of 20 to 50 nm and a mean aggregate diameter in the range of 20 to 600 nm. The ratio of the weight of the lubricant to the weight of the colorant may be in the range of 0.5 to 5.0. An image forming apparatus incorporates the developer cartridge that holds the developer.