Ink composition capable of realizing images possessing excellent color development and fixation
First Claim
Patent Images
1. An ink composition comprising:
- a first colorant;
a second colorant;
a penetrating agent;
water; and
a water-soluble organic solvent,said first colorant being a pigment which is dispersible and/or dissolvable in water without any dispersant, said second colorant being a pigment dispersion comprising a pigment and a dispersant for dispersing the pigment.
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Abstract
An ink composition is provided which, when printed on recording media, can exhibit excellent color development and fixation, can be stably ejected, and can realize good images. This ink composition comprises a first colorant, a second colorant, a penetrating agent, water, and a water-soluble organic solvent. The first colorant is a pigment which is dispersible and/or dissolvable in water without any dispersant, and the second colorant is a pigment dispersion comprising a pigment and a dispersant for dispersing the pigment.
55 Citations
20 Claims
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1. An ink composition comprising:
- a first colorant;
a second colorant;
a penetrating agent;
water; and
a water-soluble organic solvent,said first colorant being a pigment which is dispersible and/or dissolvable in water without any dispersant, said second colorant being a pigment dispersion comprising a pigment and a dispersant for dispersing the pigment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
wherein 0≦
m+n≦
50; and
R1, R2, R3, and R4 each independently represent an alkyl group.
- a first colorant;
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13. The ink composition according to any one of claims 1 to 12, which is used in an ink jet recording method.
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14. The ink composition according to claim 13, wherein the ink jet recording method comprises the steps of ejecting droplets of the ink composition and depositing the droplets onto a recording medium to perform printing.
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15. A print produced by the recording method according to claim 14.
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16. A color ink set comprising two or more ink compositions selected from the group consisting of black ink, yellow ink, magenta ink, and cyan ink compositions,
said ink compositions each being an ink composition according to any one of claims 1 to 12. -
17. An ink set comprising a first ink composition and a second ink composition, wherein
said first ink composition and said second ink composition each are an ink composition according to any one of claims 1 to 12, and when the first ink composition and the second ink composition are printed on a recording medium under identical printing conditions, the OD value of a print produced by printing the first ink composition on the recording medium is higher than the OD value of a print produced by printing the second ink composition on the recording medium. -
18. An ink set comprising a first ink composition and a second ink composition, wherein
said first ink composition and said second ink composition each are an ink composition according to any one of claims 1 and 3 to 12, and when the content of the colorant in the first ink composition is larger than the content of the colorant in the second ink composition, the weight ratio of the first colorant to the pigment contained in the second colorant in the first ink composition is 1 exclusive: - 1 to 3;
1 while the weight ratio of the first colorant to the pigment contained in the second colorant in the second ink composition is 1;
1 exclusive to 1;
3.
- 1 to 3;
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19. The ink set according to claim 17 or 18, wherein the first ink composition is a yellow ink composition, a magenta ink composition, or a cyan ink composition, while the second ink composition is a light yellow ink composition, a light magenta ink composition, or a light cyan ink composition.
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20. The ink set according to any one of claims 16 to 19, which is used in an ink jet recording method.
Specification