Armstrong, Kratz, Quintos, Hanson & Brooks, LLP
Color image formation method
In a method for forming a multicolored toner image in accordance with an electrophotographic process, the addition amount of external additives to a non-added toner is 1.5 to 10.0 parts by weight per 100 parts by weight of the non-added toner in each developing step, the aggregation degree of the toner is within the range of 30 to 80%, and the change ratio of the aggregation degree satisfies the relation:0.8≦(initial aggregation degree/aggregation degree after no-load revolution of developing portion for 20 hours)≦1.2. According to this method, it becomes possible to form a high-quality color image while a toner always keeps a stable degree of aggregation and a charge amount.
Fujitsu Limited Ricoh Company, Ltd.
G G
G03G G03G
inventional additional
Masae Masakazu Osamu Hachiro Shin-ichi Takashi Yoshimichi Hiroshi
Nakamura Kinoshita Uchinokura Tosaka Kuramoto Yamamoto Katagiri Yamashita