Title:
COLOR IMAGE FORMING METHOD
Document Type and Number:
Japanese Patent JP3284728
Kind Code:
B2
Abstract:
PURPOSE: To provide an image forming method capable of outputting full-color images with high brightness and black and white images with low brightness for the images consisting of the black and white images coexisting in the full- color images.
CONSTITUTION: This color image forming method consists of a latent image forming stage, developing stage, transferring and separating stage and fixing stage and comprises executing development in such a manner that the black toner images are formed in the lowermost layer by superposition of four colors of toner images i.e., three kinds of chromatic colors and black. The black toners consists of a resin component and a coloring agent and the resin component contains a polyester resin which does not contain a tetrahydrofurane-insoluble component. The mol.wt. measured by gerpermeation chromatography of the resin component has a weight average mol.wt. (Mw) of 25,000 to 80,000, a number average mol.wt. (Mn) of 2,000 to 10,000 and Mw/Mn≥=10. The temp. at which the apparent melt viscosity of the black toner by a flow tester method attains 1×104 poise is in a range of 120 to 140°C.
Inventors:
Yasuhiro Oda
Masahiko Kubo
Kazuhiro Iwaoka
Hiroshi Sugisaki
Masahiko Kubo
Kazuhiro Iwaoka
Hiroshi Sugisaki
Application Number:
JP1136994A
Publication Date:
May 20, 2002
Filing Date:
January 07, 1994
Export Citation:
Assignee:
Fuji Xerox Co., Ltd
International Classes:
G03G9/087; G03G9/09; G03G13/01; G03G15/01; (IPC1-7): G03G9/087; G03G9/09; G03G13/01; G03G15/01
Domestic Patent References:
| JP5249742A | ||||
| JP1142740A | ||||
| JP3164753A |
Attorney, Agent or Firm:
Go Watanabe