Ink, method for producing ink, method for printing, and printer
An ink including water, an organic solvent, and a polyurethane resin particle is provided. A rate of content of a compound having a molecular weight of 1,000 or less and having a structure represented by the following general formula (I) in the ink is 10 ppm or less.
1. An ink, comprising:
water;
an organic solvent; and
a polyurethane resin particle containing a polyurethane resin having the structure represented by the following general formula (I),
wherein a rate of content of a compound having a molecular weight of 1,000 or less and having a structure represented by general formula (I) in the ink is 10 ppm or less.
2. The ink according to claim 1 , further comprising a colorant.
3. The ink according to claim 2 , wherein a rate of solid content of the polyurethane resin particle in the ink is 3% by mass or higher, and a solid content ratio between the colorant and the polyurethane resin particle is 1.0:(2.0 to 11.0).
4. The ink according to claim 1 , wherein the ink is used for an impermeable recording medium.
5. A method for producing the ink according to claim 1 , comprising:
adding an alkaline solution to an aqueous dispersion of the polyurethane resin particle, or a mixture of the aqueous dispersion of the polyurethane resin particle and another ink component; and
stirring a mixture resulted in the adding at 20° C. or higher,
wherein the polyurethane resin particle is a water-dispersible polyurethane resin particle.
6. A method for producing the ink according to claim 1 , comprising:
aging an aqueous dispersion of the polyurethane resin particle, or a mixture of the aqueous dispersion of the polyurethane resin particle and another ink component, at 40° C. or lower for 100 days or longer; and
filtering a product resulted in the aging,
wherein the polyurethane resin particle is a water-dispersible polyurethane resin particle.
7. A method for printing, comprising;
discharging the ink according to claim 1 to print an image.
8. A printer, comprising:
ink cartridge storing the ink according to claim 1 ; and
a discharging device configured to discharge the ink.
9. The ink according to claim 1 , wherein the polyurethane resin is obtained by synthesis from a polyol.
10. The ink according to claim 9 , wherein the polyol contains the structure of general formula (I).
11. The ink according to claim 1 , wherein the rate of content of the compound having a molecular weight of 1,000 or less and having the structure represented by general formula (I) in the ink is from 2 ppm to 9 ppm.