Yellow inkjet ink having improved print quality with porous photo media
View Patent ↗The present invention relates to yellow dye-based inkjet inks having improved permanence when jetted onto porous photo media. The inkjet ink includes a mixture of at least two yellow dyes, at least three co-solvents comprising about 18% to about 24% of the composition of the ink by weight, a penetrant, at least one wetting agent, and water.
1. An inkjet ink comprising:
a mixture of at least two yellow dyes;
at least three co-solvents comprising about 18% to about 24% of the composition of the ink by weight; wherein at least three co-solvents are selected from the group consisting of 1,3-propanediol, 1,2-alkanediol, 1,5-pentanediol, triethylene glycol, and dipropylene glycol;
a polymeric dispersant comprising about 0.5% to about 2.0% of the composition of the ink by weight;
a penetrant;
at least one wetting agent comprising about 0.5% to about 1.5% of the composition of the ink by weight, wherein the at least one wetting agent is selected from the group consisting of polyoxyethylene dimethyl siloxanes, fluorosurfactants, and combinations thereof; and
water.
2. The inkjet ink according to claim 1 , wherein the at least two yellow dyes comprise about 3.0% to about 6.0% of the composition of the ink by weight.
3. The inkjet ink according to claim 1 , wherein two of the at least three co-solvents are alkanediols and the third co-solvent is a glycol.
4. The inkjet ink according to claim 1 , further comprising one or more buffers selected from the group consisting of triethanolamine (TEA), N,N-bis(2-hydroxyethyl)tuarine or N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid (BES), and combinations thereof.
5. The inkjet ink according to claim 1 , further comprising a biocide.
6. The inkjet ink according to claim 1 , wherein the penetrant is a 1,2-alkanediol.
7. A method of printing utilizing an inkjet ink, the method being comprised of the steps of:
positioning a porous photo medium substantially adjacent to a printer having a print head retaining an inkjet ink, wherein the inkjet ink is comprised of a mixture of at least two yellow dyes;
at least three co-solvents comprising about 18% to about 24% of the composition of the ink by weight; wherein at least three co-solvents are selected from the group consisting of 1,3 propanediol, 1,2-alkanediol, 1,5-pentanediol, triethylene glycol, and dipropylene glycol;
a polymeric dispersant comprising about 0.5% to about 2.0% of the composition of the ink by weight;
a penetrant;
at least one wetting agent comprising about 0.5% to about 1.5% of the composition of the ink by weight, wherein the at least one wetting agent is selected from the group consisting of polyoxyethylene dimethyl siloxanes, fluorosurfactants, and combinations thereof; and
water;
jetting the inkjet ink from the print head onto a porous photo medium.
8. The method of printing utilizing an inkjet ink according to claim 7 , wherein the mixture of at least two yellow dyes comprises about 3.0% to about 6.0% of the composition of the ink by weight.
9. The method of printing utilizing an inkjet ink according to claim 7 , further comprising one or more buffers selected from the group consisting of triethanolamine (TEA), N,N-bis(2-hydroxyethyl)tuarine or N,N-bis(2-hydroxyethyl)-2-aminoethane sulfonic acid (BES), and combinations thereof.