Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1996-10-11
1997-11-25
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3127, 106 316, C09D 1102
Patent
active
056907214
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording system and more particularly to a water-base dispersion ink composition for an ink jet recording system and a process for producing the same.
2. Background Art
A water-base ink composition used in an ink jet recording system generally contains a dye or a pigment as a colorant. A water-base ink composition containing a dye, in a dissolved state, as a colorant is excellent in anti-clogging property, storage stability and other properties. Prints formed using this ink composition, however, lack in water resistance and light fastness, that is, have low fastness, often posing a problem. On the other hand, an attempt to use a pigment or a hydrophobic dye has been made in order to impart water resistance to prints. This type of ink composition, however, poses a new problem that the pigment or dye as the colorant should be stably dispersed.
Conventional water-base ink compositions using a pigment or a hydrophobic dye include, for example, an oil-base ink composition comprising an oil dye dissolved or dispersed in an organic solvent (Japanese Patent Laid-Open No. 84311/1975), a water-base ink composition comprising a dye, insoluble in water and soluble in a water-soluble organic solvent, dissolved in an aqueous mixed solution of water and a water-soluble organic solvent (Japanese Patent Laid-Open Nos. 59970/1982, 53372/1986, and 162772/1988), an emulsion ink composition comprising a hydrophobic dye dispersed in an oil-in-water emulsion form (Japanese Patent Laid-Open No. 58504/1979), a water-base ink composition with a disperse dye dispersed therein (Japanese Patent Laid-Open Nos. 59108/1975, 4665/1984, and 133076/1985), and a water-base ink composition with a water-insoluble pigment dispersed therein (Japanese Patent Laid-Open Nos. 147859/1981 and 27476/1987).
The presence of a dispersant component is indispensable for many of these ink compositions. Further, in the above ink compositions, the step of grinding or finely dispersing a colorant by a ball mill, a sand mill, or ultrasonic dispersion should be provided in order to realize a stable dispersion system.
SUMMARY OF THE INVENTION
The present inventors have now found that a water-base ink composition having a stable dispersion system can be provided substantially without use of any dispersant component.
Accordingly, an object of the present invention is to provide an ink composition, which substantially needs no dispersant component, and a process for producing the same.
Another object of the present invention is to provide an ink composition, for ink jet recording, having various properties required of ink compositions for an ink jet recording system.
The water-base ink composition of the present invention comprises a water-insoluble colorant, a water-soluble organic solvent, and water, of not more than 1% by weight and being soluble in the water-soluble organic solvent, composition.
The process for producing the ink composition according to the present invention comprises the step of: precipitate fine particles of the colorant, thereby preparing an ink composition with the fine particles of the colorant dispersed therein.
DETAILED DESCRIPTION OF THE INVENTION
Water-insoluble Colorant
In the water-insoluble colorant used in the present invention, the "insoluble in water" means that the solubility in water at 20.degree. C. is not more than about 1% by weight. Preferred examples of the dye or pigment include colorants which are classified, in the art, as oil dyes and disperse dyes or pigments readily soluble in an organic solvent. These colorants may be used alone or as a mixture of two or more.
In the ink composition of the present invention, the colorant is present in a dispersed state. Specifically, the colorant is present as fine particles in the ink composition of the present invention. It is not easy to define the boundary between the dissolution of a substance and the dispersion of the substance. However, in the ink composition of the pre
REFERENCES:
patent: 5492559 (1996-02-01), Oliver et al.
patent: 5514207 (1996-05-01), Fague
patent: 5531816 (1996-07-01), Wickramanayake
Klemanski Helene
Seiko Epson Corporation
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