Electrophotography – Image formation – Development
Patent
1996-02-09
1998-06-30
Ramirez, Nestor R.
Electrophotography
Image formation
Development
399231, 399302, 430109, G03G 1508, G03G 1514
Patent
active
057747717
ABSTRACT:
An image forming method has a developing step of developing an electrostatic latent image by the use of a developer to form a toner image on an electrostatic latent image bearing member, a primary transfer step of transferring the toner image onto an intermediate transfer member to which a voltage is applied, and a secondary transfer step of transferring onto a transfer medium the toner image held on the intermediate transfer member, while a transfer means to which a voltage is applied is pressed against the transfer medium. The developer has a toner. The toner is a black toner having at least i) black toner particles formed of a binder resin with a colorant dispersed therein and ii) an inorganic fine powder. The black toner has the value of shape factor SF-1 of 110<SF-1.ltoreq.180, the value of shape factor SF-2 of 110<SF-2.ltoreq.140, and the value of ratio B/A of 1.0 or less which is the ratio of a value B obtained by subtracting 100 from the value of SF-2 to a value A obtained by subtracting 100 from the value of SF-1.
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Patent Abstracts of Japan, vol. 18, No. 211 (P-1726) of JP 6-011898.
"Polymer Handbook", edited by Brandrup et al., 2nd Ed., published by John Wiley & Sons, p. (III-139) -(III-192).
Karaki Yuki
Kukimoto Tsutomu
Nozawa Keita
Okado Kenji
Ugai Toshiyuki
Canon Kabushiki Kaisha
Ramirez Nestor R.
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