Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1998-05-11
2000-06-13
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3172, 106 3175, C09D 1100
Patent
active
060744677
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of manufacturing jet ink and particularly relates to dispersion systems of colored fine particles used for the jet ink.
BACKGROUND ART
There are two types of inks used for ink-jet printing: oily inks and aqueous inks. Since the oily inks have problems due to unpleasant odors and toxicity, aqueous inks are widely used currently.
However, conventional aqueous inks have drawbacks in water proofing and fade-resistance qualities, because it uses water soluble dyes as the coloring agent. Moreover, since the dye is dissolved to its molecular level, the quality of the printing is extremely deteriorated because beard-like bleeding called "feathering" occurs, when printing is performed using ordinary paper which is normally used in offices, for example, for copiers.
Conventionally, so called "aqueous pigment inks" are proposed. Examples of these inks include an ink and a polymer latex which contain carbon black or an organic pigment dispersed in a water-soluble resin used for both the purposes of a binder and of a dispersing medium, and a dispersion-type ink composed of microcapsules involving a colorant agent which is dispersed in a resin dispersion medium.
As an aqueous pigment ink for a ink-jet printer, it is necessary to use fine colorant particles dispersed as finely as possible in an aqueous medium. An example of the aqueous ink of a resin solution type is shown in Japanese Patent No. 2512861, which discloses a method of preparation of an aqueous ink with improved characteristics, comprising the steps of: (1) supplying a pigment and a polymer dispersion agent into a twin roll milling device, (2) obtaining a dispersion product of the pigment and the polymer dispersion agent by milling, and (3) dispersing the dispersion product in an aqueous carrier medium. Japanese Patent Application, First Publication, No. Hei 3-153775 discloses an aqueous ink composition for ink-jet printing comprising (a) a solid mixture of a pigment and a polyacrylate resin containing a carboxyl group, (b) an organic solvent which can be diluted by water, (c) a wetting agent, and (d) water. Although these techniques are effective in pulverizing the pigment into fine particles, the printing operation is often interrupted by an extraordinary emission of ink due to the increase of the viscosity of the ink caused by evaporation of water in the ink, and in the worst cases, the jet nozzle is clogged, and it is observed that the water proof quality of the printed matter is poor.
In general, the resin-dispersion-type aqueous ink is advantageous in the low susceptibility for the viscosity increase by water evaporation. Practically, Japanese Patent Application, First Publication, No. Sho 58-45272 discloses an ink composition including an urethane polymer latex containing dyes, and Japanese Patent Application, First Publication, No. Sho 62-95366 proposes an ink containing a dye packed in polymer particles which are produced by dissolving a polymer and a solvent dye in a water insoluble organic solvent, mixing with a water solution containing a surface active agent and emulsifying the mixture, and after evaporating the solvent, obtaining an ink containing a dye involved in polymer particles. Japanese Patent Application, First Publication, No. Sho 62-254833 proposes a method of making an aqueous dispersion of the colorant by decreasing the surface tension at an interface between the organic solvent and water to less than 10 dyne at the time of the encapsulation process. Japanese Patent Application, First Publication, No. Hei 1-170672 proposes a recording liquid containing the microencapsulated dye. However, the above colorant dispersions are not necessarily sufficient in the dispersion stability and are also not necessarily satisfactory in the emission property of the ink-jet because of high foaming properties due to the effect of the surface active agent used in the encapsulation process.
Japanese Patent Application, First Publication, No. Hei 3-240586 proposes an image forming materi
REFERENCES:
patent: 5556583 (1996-09-01), Tashiro et al.
patent: 5795376 (1998-08-01), Ide
Patent Abstract of Australia No. AU-A-42027/93 dated Feb. 2, 1975. (See PCT Search Report).
Doi Ritsuko
Inoue Sadahiro
Kawai Kazunari
Osawa Norie
Tabayashi Isao
Bell Mark L.
Dainippon Ink and Chemicals Inc.
Faison Veronica F.
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