US 11,952,500 B2
Aqueous gravure printing ink
Yuki Ozaki, Izumisano (JP); Yasufumi Ueda, Wakayama (JP); Ryuma Mizushima, Wakayama (JP); and Takuto Matsuzono, Tokyo (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 16/972,419
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Apr. 2, 2019, PCT No. PCT/JP2019/014626
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2019/235048, PCT Pub. Date Dec. 12, 2019.
Claims priority of application No. 2018-110368 (JP), filed on Jun. 8, 2018.
Prior Publication US 2021/0163767 A1, Jun. 3, 2021
Int. Cl. C09D 11/037 (2014.01); C09D 11/107 (2014.01); C09D 11/108 (2014.01); C08K 5/23 (2006.01)
CPC C09D 11/037 (2013.01) [C09D 11/107 (2013.01); C09D 11/108 (2013.01); C08K 5/23 (2013.01)] 13 Claims
 
1. An aqueous gravure ink comprising a pigment, a water-soluble organic solvent, a surfactant and water, in which:
the water-soluble organic solvent comprises a glycol ether having a boiling point of not lower than 100° C. and not higher than 260° C.;
the surfactant comprises a silicone-based surfactant comprising a constitutional unit represented by the following formula (1);
a content of the water-soluble organic solvent in the ink is not less than 1% by mass and not more than 10% by mass; and
a content of water in the ink is not less than 50% by mass and not more than 80% by mass,

OG Complex Work Unit Chemistry
wherein m and n are numbers of respective structural units; a is an integer of not less than 0 and not more than 40; b is an integer of not less than 1 and not more than 40; R is a hydrogen atom or an alkyl group; and a ratio of [(a+b)/(m/n)] is not less than 1.60 and not more than 4.5.