Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
1999-09-15
2001-04-24
Rodee, Christopher (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
Reexamination Certificate
active
06221548
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a toner used for electrophotographic printing, a developer including the toner, and printed matter made by using the developer. More particularly, it relates to a toner and a developer that can produce printed matter having ink printed-like images causing less eyestrain, and such printed matter.
2. Description of the Related Art
Conventionally, publications have been mainly prepared by offset printing, one of planographic printings. In the printing process, a plate having hydrophilic and lipophilic sections is prepared, an ink is applied to the surface of the plate, the ink is transferred to a rubber blanket, then the ink is printed on a paper sheet.
The printing method is advantageous for preparing more than thousands of publications, but not for preparing a small number of publications such as hundreds of publications. This is because preparation of the plate usually costs too much. This is one of the main reasons that make it difficult to republish out-of-print publications even if there is a demand for republishing such publications, since republication needs another set of plates.
One of the solutions of the problem may be preparing such a small number of publications by electrophotographic printing in which toner is used to form an image. However, although the printed matters are well adapted for being read continuously for a relatively short time, reading printed matters prepared by electrophotographic printing continuously for a long time is likely to make the reader's eyes tired.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a toner used in electrophotographic printing for making ink printed-like images or representations including characters and pictures, a developer using the toner, and printed matter prepared by the developer, which can be adapted for being read continuously for a long time period while reducing the fatigue for the readers' eyes.
According to an aspect of the present invention, a toner for making ink printed-like image has main particles. Each main particle comprises 100 parts by weight of binder resin and 1 to 3 parts by weight of black coloring agent dispersed in the binder resin.
According to another aspect of the present invention, a developer for making an ink printed-like image comprises carrier particles and the above-mentioned toner.
According to further aspect of the present invention, the printed matter comprises a printing material and an image formed on the material by the above-mentioned toner.
According to a further aspect of the present invention, the toner for making ink printed-like image has main particles. Each main particle comprises a binder resin and a coloring agent dispersed in the binder resin. An image formed by the toner has a lightness of 20 to 40, a hue (a) of −1.5 to 0.5, and a hue (b) of 1.5 to 6.5.
According to a further aspect of the present invention, the toner for making ink printed-like image has main particles. Each main particle comprises a binder resin and a coloring agent dispersed in the binder resin. The toner in the powder state has a lightness of 15 to 30, a hue (a) of −2.0 to 1.2, and a hue (b) of 0.5 to 5.5.
According to a further aspect of the present invention, the toner for making ink printed-like image has main particles. Each main particle comprises a binder resin and a coloring agent dispersed in the binder resin. The toner has 2.0 to 10.0% reflectance over the range of wavelengths from 400 to 700 nm and 3.0 to 10.0% of reflectance over the range of wavelengths from 580 to 640 nm.
REFERENCES:
patent: 5273853 (1993-12-01), Urano et al.
patent: 5306589 (1994-04-01), Yamamoto et al.
patent: 5314773 (1994-05-01), Kubo et al.
patent: 5759728 (1998-06-01), Hagi et al.
patent: 5804347 (1998-09-01), Inoue et al.
patent: 60-7435 (1985-01-01), None
“Charging Effects of Organic Pigments in Electrophotographic Toners”, Dyes and Pigments 9, pp. 119-127, Macholdt et al., 1988.
Funato Masatomi
Itakura Takayuki
Kato Mamoru
Kowari Akemi
Shiba Hiroaki
Kyocera Mita Corporation
Rodee Christopher
Smith Patent Office
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