Hitachi, Ltd.

Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Ryuichi Shimizu

Tsuneaki Kawanishi

Yasuki Mori

Shigeo Suzuki

Yutaka Ito

Akio Mukoh

Toshikazu Narahara

Hiroyoshi Kokaku

Hirosada Morishita

Takayuki Nakakawaji

Atsushi Kakuta

Shigeki Komatsuzaki

Osamu Isoo

Shigeo Hosaka

Mitsuoshi Shoji

Tooru Hosoda

Disclosed is an electrophotographic photoreceptor in which an organic lubricant is provided on the surface of an organic photoconductive layer or on a protective layer formed on the organic photoconductive layer. Elements of the organic lubricant are partly exposed from the surface of the organic photoconductive layer or the protective layer while the remainder portions of the elements are embedded or fixed by chemical reaction in the surface region of the photoconductive layer or the protective layer so that the exposed portions of the elements of the organic lubricant provides a lubricating surface layer. The lubricating surface layer supresses wear of the photoreceptor thereby enabling the photosensitive layer to withstand a long repeated use without impairing electrophotographic characteristics.

Electrophotographic photoreceptor and method of producing the same

The present invention provides an electrophotographic toner, particularly with a good transferability and a good flowability, which comprises a binder resin and a coloring agent, the binder resin containing a lactone-modified epoxy resin, obtained by subjecting all or a portion of secondary hydroxyl groups of epoxy compounds having hydroxyl groups in the molecules to ring opening polymerization of lactone. The present invention further provides an electrophotographic toner with a good transferability, a good flowability and a good offset resistance and also with a fixability of transferred images, which comprises a binder resin and a coloring aent, the binder resin containing:

Electrophotographic toner comprising lactone-modified epoxy resin

A dark or black print article is ink-jet printed with a white ink composition comprising at least a white pigment having a particle size of less than 3 .mu.m, a solvent and a binder resin with a good print stability. The white ink composition has a good dispersion stability, a good redispersability, and no nozzle clogging.

White ink composition for ink-jet printing

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Hitachiota, Japan

Ryuichi Shimizu