Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1997-02-21
2001-05-15
Michl, Paul R. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
Reexamination Certificate
active
06232370
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink composition for ink jet recording.
2. Background Art
Ink jet recording is a printing method wherein droplets of an ink composition are ejected and deposited onto a recording medium such as paper. This method has a feature that an image having a high resolution and a high quality can be printed at a high speed with a relatively inexpensive apparatus. In general, the ink composition used in the ink jet recording comprises water as a main component and, added thereto, a colorant and a wetting agent, such as glycerin, for prevention of clogging and other purposes.
Dyes and pigments are generally used as the colorant. The dyes are extensively used by virtue of good water solubility. Good water solubility of the dyes, however, results in deteriorated waterproofness of printed images. On the other hand, the pigments are essentially insoluble in water, realizing prints having excellent waterproofness. The pigments, however, should be stably dispersed in an ink composition and, in some cases, offer prints having inferior scratch resistance to the prints formed by using dyes. Further, printing using an ink composition containing a pigment as a colorant often suffers from uneven printing. The uneven printing refers to a variation in color density in the print derived from localization of a colorant on the paper. Although the uneven printing poses no significant problem in printing of letters of regular size, it is a serious problem in applications where figures, graphs and the like are printed.
SUMMARY OF THE INVENTION
The present inventors have now found that printing of a pigment-based ink composition comprising a pigment in combination with an inorganic oxide colloid by ink jet recording can offer a good image. Further, they have found that a better image can be realized by using the ink composition in combination with a recording head equipped with a nozzle plate which has been treated to render the nozzle plate water-repellent. The present invention has been made based on such novel finding.
Accordingly, an object of the present invention is to provide an ink composition, for ink jet recording, which can realize a good image.
Another object of the present invention is to provide an ink jet recording method which can realize a good image.
The ink composition for ink jet recording according to the present invention comprises at least a pigment, an inorganic oxide colloid, and an aqueous solvent.
The ink jet recording method according to the present invention comprises the steps of: ejecting droplets of an ink composition from a recording head; and depositing the droplets onto a recording medium to perform printing, wherein the above ink composition of the present invention is used as the ink composition.
REFERENCES:
patent: 3976497 (1976-08-01), Clark
patent: 4269760 (1981-05-01), Wakimoto
patent: 4311738 (1982-01-01), Chi
patent: 4411951 (1983-10-01), Barsotti
patent: 4421660 (1983-12-01), Hajna
patent: 4435219 (1984-03-01), Greigger
patent: 4439239 (1984-03-01), Greigger
patent: 4789399 (1988-12-01), Williams
patent: 4935463 (1990-06-01), Stockel
patent: 5318886 (1994-06-01), Saverin
patent: 5439957 (1995-08-01), Takimoto
patent: 5510188 (1996-04-01), Vockler
patent: 5534585 (1996-07-01), Roulstone
patent: 0656406 (1995-06-01), None
patent: 52-154409 (1977-12-01), None
patent: 57-31591 (1982-02-01), None
patent: 59-199780 (1984-11-01), None
patent: 4259590 (1992-09-01), None
patent: 5117562 (1993-05-01), None
patent: 6322306 (1994-11-01), None
patent: 8319442 (1996-12-01), None
patent: 9215648 (1992-09-01), None
Derwent Abstract of Japan of JP 52-154409 of Dec. 22, 1977.
Derwent Abstract of Japan of JP 51-17562 of May 14, 1983.
Patent Abstracts of Japan of JP 4-259290 of Sep. 16, 1992.
Patent Abstracts of Japan of JP 59-199780 of Nov. 12, 1984.
Patent Abstracts of Japan of JP 57-31591 of Feb. 20, 1982.
Patent Abstracts of Japan of JP 6-322306 of Nov. 22, 1994.
Patent Abstracts of Japan of JP of 8-319442 of Dec. 3, 1996.
Kubota Kazuhide
Miyabayashi Toshiyuki
Takemoto Kiyohiko
Watanabe Kazuaki
Ladas & Parry
Michl Paul R.
Seiko Epson Corporation
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