US 12,435,231 B2
Water-based ink for ink-jet recording, ink-jet recording apparatus, ink-jet recording method and ink storing container
Harumitsu Inoue, Toki (JP); and Yuki Okumura, Iwakura (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Mar. 8, 2022, as Appl. No. 17/689,110.
Claims priority of application No. 2021-059640 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0315784 A1, Oct. 6, 2022
Int. Cl. C09D 11/326 (2014.01); B41J 2/175 (2006.01); B41M 5/00 (2006.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01); C09D 11/107 (2014.01); C09D 11/36 (2014.01)
CPC C09D 11/326 (2013.01) [B41J 2/17503 (2013.01); B41M 5/0023 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/107 (2013.01); C09D 11/36 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A water-based ink for ink-jet recording comprising a pigment, resin particles, a solvent and water,
wherein the resin particles are resin particles of an acrylic-based polymer; and
a storage elastic modulus E′ at 25° C. of an ink film, of the water-based ink for ink-jet recording, which is dried and solidified is in the range of 2.1×109 Pa to 7.3×109 Pa,
a glass transition of the resin particles is in a range of 49° C. to 80° C.,
wherein the solvent includes both a diol and glycol ether, the diol is at least one of 1,2-hexanediol and 1,6-hexanediol, and the glycol ether is a combination of dipropylene glycol monopropyl ether and propylene glycol monopropyl ether or a combination of dipropylene glycol monopropyl ether and propylene glycol monobutyl ether, and
blending amounts of A and B satisfy the following condition 0.8≤B/A≤1, with
A: a blending amount (% by weight) of the dipropylene glycol monopropyl ether, and
B: a blending amount (% by weight) of propylene glycol monopropyl ether or propylene glycol monobutyl ether, and with a blending amount of the solvent in a range of 6% by weight to 10% by weight of the water-based ink for ink-jet recording,
whereby the water-based ink for ink-jet recording provides a stable image when a drying mechanism applies, with respect to 1 cm3 of the ink, an amount of heat in a range of 44 J/cm3 to 131 J/cm3.