Canon Kabushiki Kaisha

Yukari Ishibashi

Manabu Ohno

Tetsuhito Kuwashima

Satoshi Matsunaga

Shunji Suzuki

Nobuyuki Okubo

Hiroyuki Suematsu

A toner for developing an electrostatic image is constituted by a composition containing a binder resin component and a coloring agent, wherein the binder resin component contains a low-molecular weight component having a molecular weight of at most 5.times.10.sup.4 and a branching index g' of below 1. The low-molecular weight polymer component is preferably obtained by polymerizing a second monomer in mixture with a prepolymer in the presence of a polymerization initiator comprising a peroxide having a functional group of: ##STR1## and mixed with a high-molecular weight polymer component obtained by polymerization in the presence of a poly-functional polymerization initiator, and a low-molecular weight wax. The resultant toner is characterized by a good balance between the fixability and anti-offset characteristic.

Toner for developing electrostatic image, image forming method and

The invention relates to a magnetic developer comprising a magnetic toner containing at least a binder resin, a magnetic material and a hydrocarbon wax,wherein said magnetic toner has such properties that:

Magnetic developer and recognition method of magnetic-ink character

An image forming apparatus comprising an electrostatic latent image bearing member and a developing apparatus for developing an electrostatic latent image. The developing apparatus comprises a developer container in which a developer is held, and a developer-carrying member for carrying thereon the developer and transporting the developer to a developing zone. The developer-carrying member has a surface layer of a resin containing at least conductive fine particles and a solid lubricant, and the surface layer has in its relative load curve (Abbot's load curve) a cutting depth C.sub.v of not more than 5 .mu.m when a relative load length t.sub.p is 5%; and the developer contains a toner and a fine powder pretreated with a silicone oil or silicone varnish.

Growing community of inventors

Yokohama, Japan

Yukari Ishibashi