Ink set and ink jet recording method
a technology of ink jet and recording media, which is applied in the field of ink jet recording method, can solve problems such as deteriorating image quality, and achieve the effect of excellent image reproduction and improved rubbing/scratch resistance of images produced on recording media
Inactive Publication Date: 2005-02-17
SEIKO EPSON CORP
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Benefits of technology
The present inventors have now found that excellent image reproduction, color reproduction, and fixation can be realized in color printed images in which expression of black is necessary, by using a combination of a self-dispersible surface-treated pigment with at least two types of resin particles as a colorant in a black ink composition and using a pigment dispersed with the aid of a polymer as a colorant in a chromatic color ink composition. The present invention has been made based on such finding.
Accordingly, an object of the present invention is to provide an ink set and an ink jet recording method which can realize printing of images having excellent image reproduction, color reproduction, and fixation.
According to the ink set of the present invention, the so-called “white spot” or “color bleeding” which sometimes occurs in printing on plain paper can be prevented. In addition, the rubbing / scratch resistance of images yielded on recording media can be improved. The use of the ink set according to the present invention or the application of the recording method according to the present invention can realize printing of images with excellent image reproduction and color reproduction.
Problems solved by technology
In this case, disadvantageously, the total amount of ink dots sometimes exceeds the ink duty limit value, often leading to deteriorated image quality.
Method used
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The present invention will be further described with reference to the following Examples that are not intended as a limitation of the invention.
Black Ink Compositions
Preparation of Surface Treated Pigment Dispersion
Pigment Dispersion 1
A commercially available carbon black, Color Black S170 (tradename, manufactured by DEGUSSA HULS) (100 g), was mixed into 1 kg of water, and the mixture was ball milled with zirconia beads. Sodium hypochlorite (available chlorine 12%) (1400 g) was added dropwise to the milled undiluted liquid, and a reaction was allowed to proceed while ball milling for 5 hr. The reaction solution was further subjected to wet oxidation by boiling with stirring for 4 hr. The undiluted dispersion thus obtained was filtered through glass fiber filter paper GA-100 (tradename, manufactured by Advantec Toyo Kaisha Ltd.) and was further washed with water. The wet cake was redispersed in 5 kg of water, and the dispersion was desalted and purified by a reverse osmosis ...
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Abstract
Disclosed is an ink set that can realize printing of images having excellent image reproduction, color reproduction, and fixation. The ink set comprises a black ink composition and a chromatic color ink composition, wherein the black ink composition comprises at least a surface-treated pigment dispersible and / or dissolvable in water without any dispersant, resin particles having a film forming temperature below 0° C., resin particles having a film forming temperature of 30° C. or above, and water as a main solvent, and the chromatic color ink composition comprises at least a pigment, a polymer, which includes the pigment and renders the pigment dispersible in the ink composition, and water as a main solvent.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink set having excellent color reproduction, and an ink jet recording method. 2. Background Art Ink jet recording is a printing method wherein droplets of an ink composition are ejected and deposited on recording media, such as paper, to perform printing. The feature of the ink jet recording method is that images having high quality with high resolution can be printed at a high speed by means of a relatively inexpensive apparatus. In recent years, a plurality of chromatic color ink compositions are used for ink jet recording to form a color image. In general, a color image is formed by using three color ink compositions, i.e., a yellow ink composition, a magenta ink composition, and a cyan ink composition, or four color ink compositions, i.e., the above three color ink compositions and additionally a black ink composition, or six color ink compositions, i.e., the above four color ink compo...
Claims
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IPC IPC(8): B41J2/01B41M5/00C09C1/56C09C3/06C09D11/00C09D11/322C09D11/324C09D11/326C09D11/38G01D11/00
CPCY10T428/24802C09D11/40
Inventor ITO, HIROSHIOZAWA, YOSHIYUKI
Owner SEIKO EPSON CORP
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