Aqueous inkjet primering composition providing both pinning and ink spreading functionality
The present invention relates to a pre-treatment liquid providing improved spreading property when printing an ink-jet image, as well as an ink-jet printing method comprising applying the pre-treatment liquid of the invention on a recording medium prior to printing an ink-jet image and a method of pre-treating a recording medium, comprising pre-treating a recording medium with the pre-treatment liquid of the invention. With the present pre-treatment liquid a combination an improved spreading of the ink on the pre-treated recording medium can be achieved.
1. A pre-treatment liquid comprising
water,
at least one multivalent cationic salt and/or at least one organic acid dissolved in the water, and
at least one copolymer,
wherein the at least one copolymer is a block-copolymer comprising hydrophilic and apolar parts and optionally having at least one hydrophilic end group,
wherein the at least one copolymer comprises ring-containing substituents in the hydrophilic and/or apolar parts.
2. The pre-treatment liquid of claim 1 wherein the at least one copolymer comprises an apolar part comprising at least one aromatic ring.
3. The pre-treatment liquid of claim 1 , wherein the at least one copolymer is nonionic.
4. The pre-treatment liquid of claim 1 , wherein the at least one copolymer further comprises positively charged groups.
5. The pre-treatment liquid of claim 1 , wherein at least one multivalent cationic salt is contained in a concentration of 10 to 30 m % with regard to the pre-treatment liquid.
6. The pre-treatment liquid of claim 1 , wherein the at least one copolymer is contained in a concentration of 0.1 to 25 m % with regard to the pre-treatment liquid.
7. The pre-treatment liquid of claim 1 , wherein the at least one copolymer is a linear polymer.
8. The pre-treatment liquid of claim 1 , further comprising at least one cosolvent and/or at least one surfactant.
9. An ink-jet printing method, comprising:
pre-treating a recording medium with a pre-treatment liquid of claim 1 , and printing an image with at least one ink on the pre-treated recording medium.
10. The ink-jet printing method of claim 9 , wherein the pre-treatment liquid is applied in an amount to achieve a thickness of the deposited wet film of 0.1 to 10 μm.
11. The ink-jet printing method of claim 9 , wherein the pre-treatment liquid is essentially dried on the recording medium before the image is printed.
12. A method of pre-treating a recording medium, comprising pre-treating a recording medium with a pre-treatment liquid of claim 1 .
13. A pre-treatment liquid comprising
water,
at least one multivalent cationic salt and/or at least one organic acid dissolved in the water, and
at least one copolymer,
wherein the at least one copolymer is a block-copolymer comprising hydrophilic and apolar parts and optionally having at least one hydrophilic end group,
wherein the at least one copolymer comprises ring-containing substituents in the hydrophilic and/or apolar parts, wherein the at least one copolymer is a styrene-1-vinylpyrrolidone-block-copolymer with at least one vinylpyrrolidone end group.