Ricoh Company, Ltd.

Kazuyo Mizuno

Akihiko Gotoh

Kazuo Tsubuko

Tsuyoshi Asami

Kazuhiko Umemura

Nobutaka Kinoshita

Makoto Okawara

Akihiro Koseki

An ink composition contains a carrier medium and charged particles containing a coloring agent, which ink composition satisfies at least one condition of condition A or B: condition A that the specific charge quantity of the charged particles is in a range of 10 to 1,000 .mu.C/g with a positive or negative polarity; and condition B that the specific resistance of the ink composition is 10.sup.10 .OMEGA.cm or more; and ink-jet recording methods using the ink composition are proposed.

Ink composition and recording method using the same

A developer for use in electrophotography for developing latent electrostatic images to visible toner images, includes at least two kinds of toner particles with different shapes selected from the group consisting of spherical toner particles, fibrous toner particles and amorphous toner particles, each toner particle containing a coloring agent and a binder resin. There is provided a liquid developer including a toner which is dispersed in a carrier liquid, in which the toner includes at least two kinds of the above-mentioned toner particles with different shapes. An electrophotographic image formation method using the above-mentioned liquid developer is also provided.

Developer for use in electrophotography, and image formation method

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Numazu, Japan

Kazuyo Mizuno