Toner, two-component developer, developing device, and image forming apparatus

Abstract

A toner is composed of toner particles which contain at least a binder resin, a colorant, and a release agent. As to particle size distribution and particle number distribution of the toner particles, a volume average particle size of the toner particles is set to be 3.0 mum to 6.0 mum, and a content of 5.0 mum or smaller toner particles is set to be 40% by number while a content of 8.0 mum or larger toner particles is set to be less than 2% by volume. Furthermore, an amount of the release agent in toner particle surface is set to be 0.7% by weight or more and 1.8% by weight or less. And furthermore, the release agent is a petroleum-based release agent.

Description

technical field [0001] The present invention relates to a toner, a two-component developer, a developing device, and an image forming device. Background technique [0002] A toner for developing a latent image can be used in various image forming processes, and as one example, it is known that it can be used in an electrophotographic image forming process. [0003] Electrophotographic image forming devices have been widely used as copiers in the past. Recently, they have excellent adaptability as output devices for computer images created by computers. device etc. An electrophotographic image forming device generally refers to a device that implements the following steps to form a desired image on a recording medium: a charging process that uniformly charges the photosensitive layer on the surface of the photoreceptor drum; Exposure process for forming an electrostatic latent image by projecting the signal light of the original image on the surface; supplying toner for ele...

AI Technical Summary

Problems solved by technology

[0008] In the invention described in Japanese Unexamined Patent Publication No. 7-199520, it is effective for long-term charging stability to make the particle diameter of the charge control agent different between the small particle diameter side and the large particle diameter side of the particle diameter distribution, but when replenishing the toner After that, it is difficult to fully charge the small particle size toner immediately

[0009] In the invention described in JP-A-9-114127, although the particle size distribution is specified as D 50p / D 84p ≤1.45 or 1.25≤Dn50 / Dn25≤1.50, but in the regulation of the particle size distribution, the content of fine powder toner particles with a volume average particle diameter of 4 μm or less is not sufficient, and sufficient fineness and resolution cannot be achieved Image

[0010] In the invention described in Japanese Unexamined Patent Publication No. 2005-234410, since the amount of WAX present near the surface of the toner is high relative to the total components in the toner, which is 2 to 10% by weight, fluidity is reduced; The charging of toner particles cannot be controlled, so the fogging of non-image areas cannot be controlled

In addition, since only the volume average particle diameter is specified, sufficiently high-definition and high-resolution images cannot be obtained, and transferability becomes a major problem in areas where SF-1 is large.

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