Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1995-03-29
1996-10-01
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 22K, 106 20D, C09D 1102
Patent
active
055607713
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to an ink composition for use in color ink jet printing and more particularly to a yellow ink composition, a magenta ink composition, a solvent system suitable for a color ink composition and a color ink jet printing method using said ink compositions.
2. Background Art
In the "color ink jet printing method" wherein a color image is formed using an ink jet printing method, it is a common technique to use at least a yellow ink, a magenta ink and a cyan ink.
In the color ink jet printing method, ink compositions for respective colors, as such, should first have a good color production property. In particular, it is preferred for a color to be faithfully produced even on plain paper, especially on acid paper.
Furthermore, there is a color ink jet printing method wherein, in addition to three colors (yellow, magenta and cyan), four colors of red, green, blue and black are formed by overprinting the three color ink compositions, i.e., a yellow ink, a magenta ink and a cyan ink, to effect seven colors printing. (Black may be formed by over-printing yellow, magenta and cyan, or alternatively, a black ink may be used.)
In this type of the color ink jet printing method, besides the good color production property of the ink compositions per se, it is important for the color ink compositions to produce faithful color tone of red, green and blue when mixed by overprinting. In general, an ink composition which has a good color production property when used alone cannot be expected to have a good color production property when mixed by overprinting. Furthermore, in many cases, even though a good colors can be realized on coated pater, a poor colors are produced on paper which has a high acidity. For this reason, there is a demand for ink compositions and combinations thereof that can realize the good color production when mixed by overprinting without limiting by properties of recording paper.
Furthermore, the color ink composition for ink jet printing should have properties commonly required for ink jet printing, such as cause neither clogging of nozzles nor a change in composition and properties during storage. In particular, after a printing is suspended for a certain period, it is desirable that the printing start without any troubles such as the deviation of the ink droplets from the ink path and the missing of dots. It is preferable that the "suspending period" that is a period by the time when the deviation of the ink droplets or the missing of dots is observed should be long. An ink composition which has a long "suspending period" is hereinafter referred as an ink composition excellent in intermittent jetting stability.
SUMMARY OF THE INVENTION
The present inventors have now obtained several findings on ink compositions that can satisfy various properties required as an ink composition for color ink jet printing. The present invention has been made based on these findings.
The object of the first aspect of the present invention is to provide a yellow ink composition having excellent color production property.
The object of the second aspect of the present invention is to provide a magenta ink composition having excellent color production property.
The object of the third aspect of the present invention is to provide a cyan ink composition having excellent color production property.
The object of the fourth aspect of the present invention is to provide a solvent system suitable for a color ink composition.
The object of the fifth aspect of the present invention is to provide a color ink jet printing method that can realize a good color printed image using the above ink compositions.
Accordingly, the yellow ink composition according to the first aspect of the present invention comprises C.I.Direct Yellow 86 and C.I. Direct Yellow 132 in a weight ratio of 1:3 to 3:1 and each in an amount of 0.3 to 3.0% by weight based on the ink composition.
The magenta ink composition according to the second aspect of the present invention comprises C
REFERENCES:
patent: 4957553 (1990-09-01), Koike et al.
patent: 5075699 (1991-12-01), Koike et al.
patent: 5108504 (1992-04-01), Johnson et al.
patent: 5261953 (1993-11-01), Vieira et al.
patent: 5395434 (1995-03-01), Tochihara et al.
Hayashi Hiroko
Itano Masaaki
Koike Yoshiyuki
Kubota Kazuhide
Onishi Hiroyuki
Klemanski Helene
Seiko Epson Corporation
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