Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2000-09-11
2001-11-27
Dote, Janis L. (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S115000, C430S045320
Reexamination Certificate
active
06322944
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to ink for a liquid electrophotographic color printing system which can print a color image in a single pass manner and, more particularly, to ink for a liquid electrophotographic color printing system which is optimized to reduce the lowering of image density due to wash-off, to obtain a stable over-toned color, and to have a wide reproducible color gamut.
2. Description of the Related Art
In general, a liquid electrophotographic color printing system forms an electrostatic latent image by irradiating laser beams on a photosensitive medium, develops the image using developing devices, and transfers and prints the developed image to a sheet of printing paper through a transfer unit.
Such ink for a liquid electrophotographic color printing system is subject to various drawbacks or disadvantages. The latter include a “washing off” phenomenon and a decrease in the “development vector”. The latter terms (contained in quotation marks) are defined below.
Thus, there is a need in the art to develop an ink for liquid electromagnetic printing which does not suffer from the above disadvantages.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide ink for a liquid electrophotographic color printing system operating in a single pass manner, the ink being selected such that an image change due to wash-off and the development vector falls within the range of tolerable error.
Accordingly, to achieve the above objective, there is provided an ink for a liquid electrophotographic color printing system including a plurality of toners for yellow (Y), magenta (M) and cyan (C). Each toner is provided in a respective one of a plurality of developing devices, and each has a pigment (p) for forming an image having a predetermined color, a binder (b) for binding the pigment on printing paper, a charge controller for imparting electrical properties to the toner, a stabilizer, and a carrier for transferring the toner from the development device to the photoreceptor belt during development. The blending ratio (b/p) of the binder (p) to the pigment (p) of each toner for yellow (Y), magenta (M) and cyan (C) satisfies the following expressions:
b/p
yellow(Y)
=5±1;
b/p
magenta(M)
=7±1;
and
b/p
cyan(C)
=8±1.
REFERENCES:
patent: 5607808 (1997-03-01), Nishizawa et al.
patent: 5652282 (1997-07-01), Baker et al.
patent: 5916718 (1999-06-01), Kellie et al.
American Chemical Society (ACS) File Registry No. 30125-47-4, describing C.I. Pigment Yellow 138, Copyright 2001.
Byeon Seung-young
Kim Yong-Kook
Kim Yu-man
Song In-yong
Bushnell , Esq. Robert E.
Dote Janis L.
Samsung Electronics Co,. Ltd.
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