Incremental printing of symbolic information – Ink jet – Medium and processing means
Reexamination Certificate
1999-07-26
2002-08-27
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Medium and processing means
C347S101000
Reexamination Certificate
active
06439713
ABSTRACT:
This invention relates to a powder composition useful for forming an image of a liquid ink on a printing medium. The present invention is also directed to a process for the formation of an image of a liquid ink on a printing medium using the powder composition.
An ink jet printer utilizing a smooth surfaced transfer drum is known (U.S. Pat. No. 4,538,156). With this ink jet printer, an image is formed on the transfer drum by a print head assembly having a number of ink jet nozzles. Thereafter, a printing medium, e.g. paper, is brought in rolling contact with the drum to transfer the image on the drum to the printing. The above ink jet printing method has a problem because the image formed on the transfer drum is apt to spread or deform during its transference to the paper.
To cope with this problem, JP-A-62-92849 proposes evaporating a solvent (water) of the ink of an image before the transference to a paper. This method, however, adversely affects high speed printing. JP-A-H3-55283 proposes cooling an image formed on a transfer drum to increase the viscosity of the ink. This method also adversely affects high speed printing.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a powder composition useful for forming an image of a liquid ink on a printing medium using a transfer medium without causing deformation of the image.
Another object of the present invention is to provide a process for the formation of an image of a liquid ink on a printing medium using a transfer medium without causing deformation of the image.
It is a special object of the present invention to provide an ink jet printing method using a transfer medium, in which deformation of an image is prevented.
In accomplishing the foregoing objects, there is provided in accordance with one aspect of the present invention a powder composition including a powder of a modified polymer having a recurring unit containing at least one carboxyl group, the carboxyl groups of part of the recurring units being in the form of a salt with an aliphatic amine having at least 6 carbon atoms, and a powder of a surfactant.
In another aspect, the present invention provides a process for forming an image-on a printing medium, including the steps of:
(a) applying a powder composition containing a powder of a modified polymer having a recurring unit containing at least one carboxyl group over a surface of a transfer medium to form a layer of the powder, the carboxyl groups of part of the recurring units being in the form of a salt with an aliphatic amine having at least 6 carbon atoms;
(b) forming an image of a liquid ink over the layer, the powder being soluble or swellable in the liquid ink so that the viscosity of the liquid ink increases when contacted with the powder; and
(c) contacting the image on the transfer medium with the printing medium so that the image is transferred to the printing medium.
REFERENCES:
patent: 5190989 (1993-03-01), Himori
patent: 11188858 (1999-07-01), None
Katano Yasuo
Murakami Kakuji
Noguchi Aino
Saito Tadashi
Tanikawa Kiyoshi
Ricoh & Company, Ltd.
Shah Manish S
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