US 6,982,290 B2
Ink set
Yukihiro Nakano, Wakayama (Japan)
Assigned to Kao Corporation, Tokyo (Japan)
Filed on Dec. 09, 2002, as Appl. No. 10/314,223.
Claims priority of application No. 2001-378393 (JP), filed on Dec. 12, 2001.
Prior Publication US 2003/0125415 A1, Jul. 03, 2003
Int. Cl. C09D 11/10 (2006.01); C08K 9/00 (2006.01); C08K 9/10 (2006.01)
U.S. Cl. 523—160 18 Claims
 
1. An ink set, comprising:
at least two color inks containing water-insoluble colorants for color inks having a different color with each other,
wherein said ink set has at least one combination of two color inks satisfying that the difference in the average particle diameter of the particles contained in the water-insoluble colorant between these two color inks is 63 to 200 nm;
wherein said ink set has comprises a color ink having a lower lightness and a color ink having a lightness higher than the color ink having a lower lightness, and
wherein said ink set has at least one combination of two color inks satisfying that the average particle diameter of particles contained in the water-insoluble colorant used in the color ink having a lower lightness is larger than the average particle diameter of particles contained in the water-insoluble colorant used in the color ink having a lightness higher than the color ink having a lower lightness; and
wherein the water-insoluble colorant is an aqueous dispersion of water-insoluble polymer particles containing a pigment or a hydrophobic dye.