Black ink composition
A black ink composition is provided. The black ink composition includes a dispersive black colorant; less than 1 wt % of a glycol ether compound based on total weight of the black ink composition; a solvent; and water. The black ink composition of the present invention is free of surfactants and has excellent compatibility with a nozzle, and thus provides good smoothness in printing and high-quality image.
1. A black ink composition, comprising:
a dispersive black colorant;
0.1 to 1 wt % of a glycol ether compound based on total weight of the black ink composition;
a solvent; and
water, wherein the black ink composition has no surfactant.
2. The black ink composition of claim 1 , wherein the dispersive black colorant is carbon black.
3. The black ink composition of claim 1 , wherein the glycol ether compound is one selected from the group consisting of ethylene glycol mono-butyl ether, diethylene glycol mono-butyl ether, triethylene glycol mono-butyl ether, triethylene glycol mono-methyl ether, diethylene glycol mono-methyl ether and dipropylene glycol methyl ether.
4. The black ink composition of claim 1 , further comprising a penetrating agent, a moisturizing agent or a combination thereof.
5. The black ink composition of claim 4 , wherein the penetrating agent is at least one of N-methylpyrrolidone and 1,3-butylene glycol.
6. The black ink composition of claim 4 , wherein the moisturizing agent is at least one of glycerine and diethylene glycol.
7. The black ink composition of claim 1 , having a surface tension of 47 to 54 mN/m at room temperature.