Color composition, ink for ink-jet recording and ink-jet...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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C524S086000, C524S091000, C524S094000, C524S100000, C524S104000, C524S556000

Reexamination Certificate

active

06670410

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an aqueous color composition containing an oil-soluble dye, to an ink for ink-jet recording containing the color composition, and to an ink-jet recording method in which the ink is used.
2. Description of the Related Art
In recent years, accompanying the more widespread use of computers, ink-jet printers have come to be widely used for printing on paper, film, cloth and the like, not only in offices but in homes as well. Oil-based inks, aqueous inks, and solid inks are known as inks for ink-jet recording. Among these inks, aqueous inks are advantageous from the standpoints of ease of manufacture, handling, odor, safety, and the like, and thus, aqueous inks are mainly used. However, most aqueous inks use a water-soluble dye which dissolves in a molecular state. Thus, aqueous inks have advantages that transparency and color density thereof are high. However, because these dyes are water-soluble, their water resistance is poor. When printing is carried out on so-called regular paper, problems arise in that bleeding occurs such that printing quality markedly deteriorates, and that light resistance is poor.
In order to overcome the above-described problems, Japanese Patent Applications Laid-Open (JP-A) Nos. 56-157468, 4-18468, 10-110126, 10-195355 and the like, for example, have proposed aqueous inks that utilize a pigment and a dispersed dye.
However, with these aqueous inks, although the water resistance is improved to a certain extent, it is still insufficient. There are further problems, in that storage stability of a dispersion of the pigment and the dispersed dye in the aqueous ink is lacking, it is easy for the ink to become clogged in ink discharge ports, and the like. Moreover, in the case of such aqueous inks, generally, the hue is insufficient, and there are problems with color reproducibility due to insufficient color tone.
On the other hand, JP-A Nos. 58-45272, 6-340835, 7-268254, 7-268257, and 7-268260 propose methods of encapsulating dyes in urethane or polyester dispersion particles. JP-A No. 11-140362 proposes a method of coagulating a latex that has been prepared through polymerization in the presence of a carboxylic acid and a chain transfer agent, along with a colorant. However, these methods are still problematic in that hues of inks for ink-jet recording produced according thereto are not good and thus color reproducibility thereof is poor, and, in addition, the dispersion stability and water resistance of a dye-incorporated polymer dispersion are not always good when the dye concentration of the dispersion is increased to a desired level. Further, JP-A Nos. 9-59552, 9-111163, 9-255887, 10-36728, 11-286637 and the like disclose that the color tone can be improved by using a dye in which an aromatic diamine is coupled to a color photographic coupler. However, in these inventions, there are problems in that there is a tendency for particle diameters or a particle diameter distribution of the dispersion to be large, dispersion stability and suitability for printing are insufficient, and the color tone varies in accordance with the type of image-receiving paper.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a color composition in which the particle diameter of the coloring particulates is small, the dispersion stability is excellent, there is little dependency on paper and excellent color formation and color tone are obtained when printing on freely selected paper, and which has excellent water resistance and light resistance, and which is suitable for an aqueous ink for writing, an aqueous printing ink, an ink for information recording, or the like. Another object of the present invention is to provide an ink for ink-jet recording and an ink-jet recording method which are suitable for thermal, piezoelectric, electric field and acoustic ink-jet systems, with which, when printing or the like is carried out using nozzles or the like, there is little clogging of the nozzle tips, in which there is little dependency on paper and excellent color formation and color tone are obtained when printing on a freely selected paper, and in which water resistance and light resistance are excellent.
The object described above can be achieved by the following means:
A first aspect of the present invention is an ink for ink-jet recording which comprises a color composition prepared by dispersing, in a water-based medium, coloring particulates that contain an oil-soluble dye and a vinyl polymer which is obtained through copolymerization of a monomer represented by general formula (I) as follows:
in which general formula (I): R
11
represents a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, or a chlorine atom; L
1
represents —O—, —COO—, —OCO—, —CONR
12
—, or a substituted or unsubstituted phenylene group; X
1
represents —CH
2
—, —CHR
13
—, —CR
13
R
14
—, —CH
2
CH
2
O—, —CH
2
CHR
13
O—, —CHR
13
CH
2
O—, a substituted or unsubstituted arylene group, or a substituted or unsubstituted cycloalkylene group; q is 2 or more if L
1
is —COO—, and q is 1 or more in other cases; L
2
represents —O—, —CO—, —COO—, —OCO—, —CONR
12
—, —NR
12
CO—, —NR
12
COO—, or —NR
12
CONR
15
—; r is 0 or 1; X
2
represents —CH
2
—, —CH
2
CHR
13
—, —CHR
13
CH
2
—, a substituted or unsubstituted arylene group, or a substituted or unsubstituted cycloalkylene group; s is from 0 to 18; R
12
and R
15
each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; and R
13
and R
14
each independently represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group.
A second aspect of the present invention is a color composition which comprises coloring particulates dispersed in a water-based medium, the coloring particulates containing an oil-soluble dye and a vinyl polymer which is obtained through copolymerization of a monomer represented by the above-described general formula (I).
A third aspect of the present invention is an ink-jet recording method, in which recording is carried out using an ink for ink-jet recording which includes a color composition prepared by dispersing, in a water-based medium, coloring particulates that contain an oil-soluble dye and a vinyl polymer which is obtained through copolymerization of a monomer represented by the above-described general formula (I).
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The color composition, the ink for ink-jet recording, and the ink-jet recording method of the invention are described below.
[Color Composition]
The color composition of the invention is prepared by dispersing coloring particulates, which contain an oil-soluble dye and a vinyl polymer, in a water-based medium.
Oil-soluble Dye
Among oil-soluble dyes which can be used in the present invention, a freely selected dye can be used for a yellow dye. Examples of the yellow dye include aryl- or heterylazo dyes having, as a coupling component thereof, a phenol, a naphthol, an aniline, a pyrazolone, a pyridone, or a closed chain type active methylene compound; azomethine dyes having, as the coupling component thereof, a closed type active methylene compound; methine dyes such as benzylidene dyes, monomethineoxonol dyes, and the like; quinone dyes such as naphthoquinone dyes, anthraquinone dyes, and the like; and the like. Other types of dyes which can be used are quinophthalone dyes, nitro
itroso dyes, acridine dyes, acridinone dyes, and the like.
Among the oil-soluble dyes which can be used in the present invention, a freely selected dye can be used for a magenta dye. Examples of the magenta dye include aryl- or heterylazo dyes having, as the coupling component thereof, a phenol, a naphthol, or an aniline; azomethine dyes having, as the coupling component thereof, a pyrazolone or a pyrazotriazole; methine dyes such as arylidene dyes, styryl dyes, merocyanine dyes, and oxonol dyes; carbonium dyes such as diphenylmethane dyes, triphenylmethane dyes, xanthene

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