Water-based ink composition and ink-jet recording process employing the same
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsHideto Yamazaki, Masaya Fujioka, Shunichi Higashiyama
Life of this patent
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Abstract
A water-based ink composition having an aqueous medium, a dye dissolved therein, and a pH adjuster. The pH adjuster may be any one of the following (1) to (4): (1) triethanolamine and triethanolamine hydrochloride; (2) triethanolamine and hydrochloric acid; (3) tris (hydroxymethyl) aminomethane and tris (hydroxymethyl) aminomethane hydrochloride; and (4) tris (hydroxymethyl) aminomethane and hydrochloric acid; and is used to adjust the pH of the water-based ink composition to a value within the range of from 8 to 10.
Claims16
A water-based ink composition comprising an aqueous medium, a dye dissolved therein, and a pH adjuster;
- wherein said pH adjuster comprises any one of the following (1) to (4):
- (1) triethanolamine and triethanolamine hydrochloride;
- (2) triethanolamine and hydrochloric acid;
- (3) tris(hydroxymethyl)aminomethane and tris(hydroxymethyl)aminomethane hydrochloride;
- and
- (4) tris(hydroxymethyl)aminomethane and hydrochloric acid;
- and the pH of said water-based ink composition is adjusted to a value within the range of from 8 to 10.
An ink-jet recording process carried out by jetting an ink composition to a recording medium in the form of droplets to make a record, wherein;
- said ink composition comprises a water-based ink composition comprising an aqueous medium, a dye dissolved threrein, and a pH adjuster;
- wherein said pH adjuster comprises any one of the following (1) to (4):
- (1) triethanolamine and triethanolamine hydrochloride;
- (2) triethanolamine and hydrochloric acid;
- (3) tris(hydroxymethyl)aminomethane and tris(hydroxymethyl)aminomethane hydrochloride;
- and
- (4) tris(hydroxymethyl)aminomethane and hydrochloric acid;
- and the pH of said water-based ink composition is adjusted to a value within the range of from 8 to 10.
Dependencies are inferred from the claim text.