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Aqueous ink composition for ink-jet recording
| Details |
Inventors: Shimada, Masaru; Kawanishi, Toshiyuki; Murakami, Kakuji; Aruga, Tamotsu; Uemura, Hiroyuki;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Yarbrough; Amelia Burgess
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 and R.sup.2 each represent hydrogen, an alkyl group, an alkoxy group, halogen, a carboxyl group or a sulfonic acid group; A represents ##STR2## wherein R.sup.3 represents an alkyl group, a phenyl group, a carbamoyl group or a carboxyl group; R.sup.4 represents an unsubstituted or substituted phenyl group, an unsubstituted or substituted napthyl group, or an unsubstituted or substituted alkyl group; R.sup.5 represents a hydroxyl group or an amino group; R.sup.6 represents a hydroxyl group or an unsubstituted or substituted amino group; M represents hydrogen, an alkali metal cation, amine cation or an ammonium ion; m is an integer of 0 or 1; 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)
##STR19##
(15)
The above dyes can be prepared by a conventional method.
For example, the dye (1) can be prepared by subjecting (4,4'-diamino)terephthalic acid dianilide to diazotization by a conventional method to produce a diazonium compound, which is then coupled with H-acid in an alkaline solution.
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 according to the present invention 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.
Examples of such humectants for use in the aqueous ink according to the present invention are polyhydric alcohols, alkyl ethers of polyhydric alcohols, amine derivatives such as triethanol amine, amides such as dimethylformamide, and nitrogen-containing heterocyclic compounds such as N-methyl-2-pyrrolidone, 2-pyrrolidone and 1,3-dimethyl imidazolidinone.
Specific examples of the polyhydric alcohols are ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol and glycerin
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