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AssigneeFuji Xerox Co., Ltd.
InventorsHideyuki Akagi, Susumu Saito, Masaru Miura, Takashi Imai, Masayuki Takei, Masanori Ichimura, Michio Take, Satoshi Inoue, Yasuo Yamamoto, Toshiaki Murofushi, Hiroshi Nakazawa, Koji Fukushima
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A toner for developing an electrostatic charge image is disclosed, which is formed by adding and mixing an external additive with toner particles having an average particle size of not larger than 9 .mu.m and comprising at least a colorant and a binder resin, wherein the external additive is fine particles having a particle size of 20 to 80 nm. There is also disclosed a process for preparing the toner which comprises adding external additives to the toner particles and mixing them, wherein the addition and mixing of said external additive are carried out under specific conditions.
A process for preparing a toner for developing an electrostatic charge image, which comprises adding external additives to toner particles having an average particle size of not larger than 9 .mu.m and comprising at least a colorant and a binder resin and mixing them, wherein fine particles (A) having a particle size of 30 to 80 nm as one component of the external additives are added to and mixed with the toner particles such that said fine particles adhere onto the surface of the toner particles;
A toner for developing an eletrostatic charge image, comprising toner particles having at least a colorant and a binder resin, the toner particles having an average particle size of not larger than 9 .mu.m, and inorganic fine particles having a particle size of 30 to 80 nm, the inorganic fine particles being mixed with the toner particles and adhered to the surface of the toner particles in an amount which gives a surface coverage ratio of at least 10% thereby improving toner transferring latitude between toner cloud and unevenness of transfer.
A toner for developing an electrostatic charge, comprising toner particles having at least a colorant and a binder resin, the toner particles having an average particle size of not larger than 9 .mu.m, first inorganic fine particles having a particle size of 5 to 20 nm adhered to the surface of the toner particles, and second inorganic fine particles having a particle size of 30 to 80 nm, the first and second inorganic fine particles being mixed with the toner particles and adhered to the surface of the toner particles in an amount which gives a surface coverage ratio of at least 10% thereby improving toner transferring latitude between toner cloud and unevenness of transfer.
Dependencies are inferred from the claim text.