US 12,473,450 B2
Ink set
Teruyuki Fukuda, Wakayama (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 17/999,338
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed May 19, 2021, PCT No. PCT/JP2021/018885
§ 371(c)(1), (2) Date Nov. 18, 2022,
PCT Pub. No. WO2021/235462, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 2020-090062 (JP), filed on May 22, 2020.
Prior Publication US 2023/0183510 A1, Jun. 15, 2023
Int. Cl. C09D 11/40 (2014.01); A45D 33/02 (2006.01); A61K 8/11 (2006.01); A61K 8/19 (2006.01); A61K 8/29 (2006.01); A61Q 1/02 (2006.01); B41J 2/165 (2006.01); C09D 11/322 (2014.01); C08K 3/22 (2006.01)
CPC C09D 11/40 (2013.01) [A45D 33/02 (2013.01); A61K 8/11 (2013.01); A61K 8/19 (2013.01); A61K 8/29 (2013.01); A61Q 1/02 (2013.01); B41J 2/16517 (2013.01); C09D 11/322 (2013.01); A45D 2200/057 (2013.01); A61K 2800/43 (2013.01); A61K 2800/623 (2013.01); C08K 3/22 (2013.01); C08K 2003/2265 (2013.01); C08K 2201/014 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ink set wherein a droplet of ink is ejected in an amount of not less than 100 pL and not more than 5,000 pL, wherein:
the ink set comprises at least two inks comprising an ink A and an ink B; and
the ink set satisfies all of the following conditions 1 to 3 as measured, on a surface of a solid image with a 100% print duty which is printed on a polyester film using the ink A and the ink B, respectively, with respect to coordinates (L*A, a*A, b*A) of the ink A and coordinates (L*B, a*B, b*B) of the ink B in CIE L*a*b* color space,
Condition 1: the coordinate values a*A and a*B are each not less than 5 and not more than 35, and the coordinate values b*A and b*B are each not less than 10 and not more than 40;
Condition 2: a hue angle hA represented by the following formula (II-1) and a hue angle hp represented by the following formula (II-2) are each not less than 40° and not more than 70°,
hA=tan−1(b*A/a*A)  (II-1),
hB=tan−1(b*B/a*B)  (II-2); and
Condition 3: a chroma difference ΔC represented by the following formula (III) is not less than 2 and not more than 20,
ΔC=((a*A−a*B)2+(b*A-b*B)2)0.5  (III).