White ink composition and recorded material using the same
The present invention provides a white ink composition that can give a white image having excellent abrasion resistance. The white ink composition according to the invention is a white ink composition containing hollow resin particles and a polyurethane resin characteristically having a glass transition temperature of 50° C. or less.
1. A white ink composition comprising:
hollow resin particles;
a polyurethane resin, wherein the polyurethane resin has a glass transition temperature of 50 degrees C. or less; and
at least one organic solvent selected from alkanediols.
2. The white ink composition according to claim 1 , wherein the polyurethane resin is dispersed as particles in a solvent.
3. The white ink composition according to claim 1 , wherein the amount of the polyurethane resin is 0.5 to 10% by weight.
4. The white ink composition according to claim 1 , wherein the hollow resin particles have an average particle diameter 0.2 to 1.0 um.
5. The white ink composition according to claim 1 , wherein the amount of the hollow resin particles is 5 to 20% by weight.
6. The white ink composition according to claim 1 , further comprising: an acetylene glycol surfactant or a polysiloxane surfactant.
7. The white ink composition according to claim 1 , wherein the white ink composition is applied to an ink-jet recording system.
8. A recorded material having an image formed by using the white ink composition according to claim 1 .
9. The white ink composition according to claim 1 , wherein the organic solvent is selected from 1,2-alkanediols having 4 to 8 carbon atoms.
10. A white ink composition, comprising:
hollow resin particles;
a polyurethane resin, wherein the polyurethane resin is in particle form dispersed in water; and
at least one organic solvent.
11. The white ink composition according to claim 10 , wherein the average particle diameter of the polyurethane resin is in the range between 50 nm and 200 nm.