Inkjet printing methods and ink sets
View Patent ↗An inkjet printing method includes, in order, the steps of a) providing to an inkjet printer at least two or more colorless liquids having a different composition and at least one color inkjet ink; b) mixing the color inkjet ink in a controlled amount with the two or more colorless liquids; and c) printing the ink-mixture of the color inkjet ink and the two or more colorless liquids with the inkjet printer onto an ink-receiver.
1. A color inkjet ink set comprising:
two or more colorless liquids having a different composition;
at least one radiation curable color inkjet ink containing a colorant; wherein the colorant is a pigment; and
the two or more colorless liquids and the at least one radiation curable color inkjet ink include a polymerizable compound, and an amount and/or type of the polymerizable compound in at least one of the two or more colorless liquids differs from an amount and/or type of the polymerizable compound in the at least one radiation curable color inkjet ink; wherein
a surface tension of at least one of the two or more colorless liquids differs by more than 3.0 mN/m from a surface tension of the at least one radiation curable color inkjet ink.
2. The color inkjet ink set according to claim 1 , wherein the color inkjet ink set comprises cyan, magenta, yellow, and black inkjet inks.
3. The color inkjet ink set according to claim 1 , wherein the at least one radiation curable color inkjet ink includes a vinyl ether acrylate.
4. A color inkjet ink set comprising:
two or more colorless liquids having a different composition;
at least one radiation curable color inkjet ink containing a colorant; wherein
the colorant is a pigment; and
the two or more colorless liquids and the at least one radiation curable color inkjet ink include a polymerizable compound, and an amount and/or type of the polymerizable compound in at least one of the two or more colorless liquids differs from an amount and/or type of the polymerizable compound in the at least one radiation curable color inkjet ink; wherein
a viscosity of at least one of the two or more colorless liquids differs by more than 5.0 mPa·s at 30° C. and at a shear rate of 100 s-1 from a viscosity of the at least one radiation curable color inkjet ink.
5. The color inkjet ink set according to claim 4 , wherein the color inkjet ink set comprises cyan, magenta, yellow, and black inkjet inks.
6. The color inkjet ink set according to claim 4 , wherein the at least one radiation curable color inkjet ink includes a vinyl ether acrylate.
7. A color inkjet ink set comprising:
two or more colorless liquids having a different composition;
at least one radiation curable color inkjet ink containing a colorant; wherein
the colorant is a pigment; and
the two or more colorless liquids and the at least one radiation curable color inkjet ink include a polymerizable compound, and an amount and/or type of the polymerizable compound in at least one of the two or more colorless liquids differs from an amount and/or type of the polymerizable compound in the at least one radiation curable color inkjet ink; wherein
the two or more colorless liquids and the at least one radiation curable color inkjet ink include an initiator, and an amount and/or type of the initiator in at least one of the two or more colorless liquids differs from an amount and/or type of the initiator in the at least one radiation curable color inkjet ink.
8. The color inkjet ink set according to claim 7 , wherein the color inkjet ink set comprises cyan, magenta, yellow, and black inkjet inks.
9. The color inkjet ink set according to claim 7 , wherein the at least one radiation curable color inkjet ink includes a vinyl ether acrylate.
10. A color inkjet ink set comprising:
two or more colorless liquids having a different composition;
at least one radiation curable color inkjet ink containing a colorant; wherein
the colorant is a pigment; and
the two or more colorless liquids and the at least one radiation curable color inkjet ink include a polymerizable compound, and an amount and/or type of the polymerizable compound in at least one of the two or more colorless liquids differs from an amount and/or type of the polymerizable compound in the at least one radiation curable color inkjet ink; wherein
the two or more colorless liquids and the at least one radiation curable color inkjet ink include a polymerization synergist, and an amount and/or type of the polymerization synergist in at least one of the two or more colorless liquids differs from an amount and/or type of the polymerization synergist in the at least one radiation curable color inkjet ink.
11. The color inkjet ink set according to claim 10 , wherein the color inkjet ink set comprises cyan, magenta, yellow, and black inkjet inks.
12. The color inkjet ink set according to claim 10 , wherein the at least one radiation curable color inkjet ink includes a vinyl ether acrylate.