Ink set comprising dark yellow ink composition
AssigneeSeiko Epson Corporation
InventorsHiroshi Fukumoto, Kazuhiko Kitamura, Miharu Kanaya, Shinichi Kato, Toshiaki Kakutani
Life of this patent
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Abstract
Disclosed is an ink set comprising at least a normal yellow ink composition and a dark yellow ink composition, the lightness of the dark yellow ink composition being lower than that of the normal yellow ink composition. This ink set can realize recorded images having excellent color reproduction and image reproduction.
Claims63
An ink set comprising at least a normal yellow ink composition and a dark yellow ink composition,
- the lightness of the dark yellow ink composition being lower than that of the normal yellow ink composition.
An ink set comprising at least a normal yellow ink composition and a dark yellow ink composition, wherein
- for the dark yellow ink composition, the absolute value of b*/a* in the L*a*b* color system as calculated from the spectral characteristics of a 1000-fold dilution of the dark yellow ink composition with water is not less than 0.83, and the b* value is not less than zero (0) and is smaller than the b* value of the normal yellow ink composition as calculated from the spectral characteristics of a 1000-fold dilution of the normal yellow ink composition with water.
A dark yellow ink composition for use in a recording method at least using two yellow ink compositions of a normal yellow ink composition and a dark yellow ink composition,
- said dark yellow ink composition comprising C.I. Direct Black 195, C.I. Direct Yellow 86, and C.I. Direct Yellow 173 as colorants.
A dark yellow ink composition comprising, as colorants, at least one first colorant selected from the group consisting of compounds represented by formula (I) and (II)
- wherein
- R1, R1′, R2, and R2′ each independently represent CH3 or OCH3;
- and
- A and A′ each independently represent a group having a structure selected from the group consisting of
- wherein
- M represents hydrogen, lithium, sodium, potassium, ammonium, or an organic amine;
- and
- n is an integer of 1 or 2, and at least one second colorant selected from the group consisting of magenta, cyan, and black dyes.
Dependencies are inferred from the claim text.