Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1997-01-13
1998-02-03
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
534803, C09D 1102
Patent
active
057139920
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a recording liquid. More particularly, the present invention relates to a magenta recording liquid which is suitable for ink-jet recording and gives printed characters having especially high water resistance.
BACKGROUND ART
The so-called ink-jet recording method has come into practical use in which droplets of a recording liquid containing a water-soluble dye, e.g., a direct dye or an acid dye, are issued from a minute ejection orifice to conduct recording.
With respect to the recording liquid, it is required to rapidly fix to recording paper for general business use, e.g., paper for electrophotography or other PPCs (plain-paper copiers) and fanfold paper (continuous paper for computers, etc.), to give a print in which the printed characters are of good quality, that is, the printed characters are free of blurring and have clear outlines. In addition, the recording liquid should also have excellent storage stability. Therefore, usable solvents are severely restricted.
With respect to dyes for the recording liquid, on the other hand, they are required, for example, not only to have sufficient solubility in the restricted solvents as described above and be stable even in long-term storage of the recording liquid, but also to give printed images having a high density, excellent water and light resistance, etc. However, it has been difficult to satisfy these many requirements simultaneously.
Although various techniques (e.g., JP-A-61-101574, JP-A-61-101576, JP-A-61-195176, JP-A-61-62562, JP-A-61-247771, JP-A-62-156168, JP-A-63-63765, JP-A-63-295685, JP-A-1-123866, JP-A-2-16171, JP-A-3-122171, JP-A-3-203970, JP-A-4-15327, JP-A-4-279671, etc.) have hence been proposed, all these prior art techniques have failed to sufficiently meet the requirements of the market. (The term "JP-A" as used herein means an "unexamined published Japanese patent application".)
An object of the present invention is to provide a magenta recording liquid which, even when used in ink-jet recording, writing utensils, etc. to conduct recording on plain paper, is satisfactory in print quality and gives recorded images having high density and excellent in light resistance and especially in water resistance, and color tone, and which has satisfactory stability in long-term storage.
DISCLOSURE OF THE INVENTION
The present inventors have found that the above object is accomplished when a specific dye is used as a recording liquid component. The present invention has been achieved based on this finding. The essential aspects of the present invention reside in a recording liquid characterized by comprising an aqueous medium and at least one dye selected from dyes, the free acid forms of which are represented by general formula {I}: ##STR2## (wherein R.sub.1, R.sub.2, and R.sub.3 each independently represents a substituted or unsubstituted alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, a halogen atom, a hydrogen atom, a hydroxyl group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted amino group, a nitro group, a sulfonic ester group, a sulfonyl group, a COOH group, or a carboxylic ester group;
m represents a number of 0, 1, or 2; and
R.sub.4, R.sub.5, R.sub.6, and R.sub.7 each independently represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 1 to 18 carbon atoms, an aryl group, an aralkyl group, an alicyclic group, or a heterocyclic group, and each may have a substituent when not representing a hydrogen atom, provided that at least one of R.sub.4, R.sub.5, R.sub.6, and R.sub.7 represents a group having a COOH group as a substituent).
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is explained below in detail.
The dye for use in the present invention is at least one monoazo dye, the free acid form of which is represented by general formula {I} described above.
Examples of R.sub.1, R.sub.2, and R.sub.3, which each inde
REFERENCES:
patent: 4631085 (1986-12-01), Kawanishi et al.
Hirasa Takashi
Murata Yukichi
Satoh Nobuyoshi
Klemanski Helene
Mitsubishi Chemical Corporation
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