Sharp Kabushiki Kaisha Corporation

Masao Suzuki

Satoshi Ogawa

Yoshiaki Akazawa

Hiroshi Onda

Yoshinori Yamamoto

Kiyoshi Toizumi

Masahiko Kubo

Toshihisa Ishida

Tohru Nishikawa

Tadayuki Sawai

Tomoko Toizumi

Kouji Kida

Akio Matsumoto

There is provided a toner which is excellent in temporal stability and environmental stability of charges and which is capable of forming images that contains almost no background fog and has high density even in a long-term use and in use at a high-temperature and high-humid circumstance, and furthermore the toner which is not scattered inside an image forming apparatus and thus causes no contamination inside the apparatus, and there is further provided a method of manufacturing the above toner. An organic boron compound is contained as a charge control agent, a surface CCA concentration per specific surface area of toner falls in a range from 2.1&#xd7;10g/cmto 5.5&#xd7;10g/cm, and a surface CCA concentration is 1.8&#xd7;10g/g or more.

Toner and method of manufacturing the same

An image forming apparatus for forming images with a toner and includes an image forming section, a paper feeding section and an image reading section, in which the non-magnetic toner is as follows: the particle size Dand the particle size Dof the toner satisfy the following formula (1), the particle size Dis from 5 to 8 &#x3bc;m, and the content of the toner particles having a particle size of at most 5 &#x3bc;m is from 15 to 35% by number:0.415&#x2266;()/&#x2266;0.475&#x2003;&#x2003;(1)wherein D, Dand Deach are a particle size where a cumulative volume from the large particle size side in the cumulative volume distribution of the toner particles reaches 10%, 50% and 90%, respectively.

Non-magnetic toner, two-component developer, and image forming apparatus

Provided is a toner not undergoing the effect of change of temperature and humidity, with high charging stability and having good fixing property and releasability. This is an electrophotographic toner containing at least a binder resin, a colorant, a charge controller and a wax in which the binder resin comprises a polyester resin having an aromatic alcohol ingredient, the charge controller comprises an organic bentonite and the wax comprises a non-polar paraffin wax.

Electrophotographic toner

Growing community of inventors

Yamatokoriyama, Japan

Masao Suzuki