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| Aqueous liquid dye composition of C.I. reactive blue ZI and caprolactam or N-methyl pyrrolidone |
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| Stabilization of tetrazolium salts with cyclodextrins |
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| Light-responsive material containing a dye comprising two cyclodextrin groups |
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Aqueous ink composition for ink-jet recording
| Details |
Inventors: Kawanishi, Toshiyuki; Shimada, Masaru; Murakami, Kakuji; Aruga, Tamotsu; Uemura, Hiroyuki;
Assignee: Ricoh Company, LTD. (Tokyo, JP)
Primary Examiner: Yarbrough; Amelia B.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland, & Maier
An aqueous ink composition for ink-jet recording comprising an aqueous solution of a water-soluble dye of formula (I) and a humectant dissolved in water: ##STR1## wherein R.sup.1 represents ##STR2## wherein R.sup.4 represents an alkyl group or a hydroxyalkyl group; R.sup.2 represents hydrogen, an alkyl group, an acetyl group, an unsubstituted or substituted benzoyl group, an unsubstituted or substituted benzenesulfonyl group, or a substituted 1,3,5-triazine ring; R.sup.3 represents hydrogen, an alkyl group, an alkoxy group, halogen or a sulfonic acid group; M represents hydrogen ion, an alkali metal cation, amine cation or an ammonium ion; and n is an integer of 1, 2 or 3. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An aqueous ink composition according to the present invention comprises a water-soluble dye of the above described formula, water and a humectant.
In the following table 1, there are listed representative examples of the water-soluble dyes having the above formula for use in the present invention:
TABLE 1
______________________________________
##STR5## (1)
##STR6## (2)
##STR7## (3)
##STR8## (4)
##STR9## (5)
##STR10## (6)
##STR11## (7)
##STR12## (8)
##STR13## (9)
##STR14## (10)
##STR15## (11)
##STR16## (12)
##STR17## (13)
##STR18## (14)
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The above dyes can be prepared by a conventional method.
For example, the dye (1) given in Table 1, which is a red water-soluble dye, can be prepared as follows: One mole of 4-nitrobenzoyl chloride is allowed to react with 2 moles of morpholine in dioxane at a temperature below room temperature, so that 4-nitrobenzoylmorpholine (m.
p.
108.
degree.
109.
degree.
C.
) is obtained.
The thus obtained nitro compound is reduced in the presence of a 5%Pd-C catalyst to produce 4-aminobenzoylmorpholine.
This is subjected to diazotization by a conventional method to produce a diazonium compound, which is then coupled with H-acid in an alkaline solution, followed by subjecting it to acidic precipitation, so that the dye (I) in Table 1 is obtained.
In the present invention, it is preferable that the dye be contained in an amount of 0.
1 to 20 parts by weight, more preferably 0.
5 to 6 parts by weight, with respect to 100 parts by weight of the ink composition in order to obtain high printing quality.
The humectant for use in the present invention, which is employed together with water, is for adjusting the physical properties of the ink composition so as to have the desired properties, to control the drying speed of the ink composition and to increase the solubility of the dye employed in the solvent of the ink composition
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