Title:
TONER FOR REVERSAL DEVELOPMENT
Document Type and Number:
Japanese Patent JP3159655
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a novel toner for reversal development which gives an image having enough image density and little fog and causes no problem even when lots of sheets are printed by incorporating a binder resin, coloring agent and specified plural chromium-contg. dyes and using the chromium contg. dyes in a specified weight ratio and specified relation of the average particle size.
SOLUTION: This toner contains at least a binder resin, coloring agent, chromium-contg. dye (A) expressed by formula I and chromium-contg. dye (B) expressed by formula II. The amts. of the chromium-contg. dye (A) and the chromium-contg. dye (B) are controlled to 50:50 to 95:5 weight ratio, and the average particle size of these dyes satisfies the relation of (average particle size of the dye (A))<(average particle size of the dye (B))≤4μm. Thereby, in a system using reversal development which can not give a high developing potential to a photoreceptor, the triboelectric charges of the toner are stable and enough image density can be obtd. even for lots of sheets are printed. Therefore, long-term printing is possible while fog in the base or fog on the photoreceptor is controlled to a range without problems for practical use.
Inventors:
Takayuki Sano
Application Number:
JP27423496A
Publication Date:
April 23, 2001
Filing Date:
September 24, 1996
Export Citation:
Assignee:
Tomagawa Paper Mill Co., Ltd.
International Classes:
G03G9/097; C09B45/26; C09C1/48; G03G9/09; (IPC1-7): G03G9/097; C09B45/26; C09C1/48; G03G9/09
Domestic Patent References:
| JP8110656A |