US 12,065,575 B2
Aqueous pigment dispersion liquid, aqueous ink-jet ink, and dry coating
Hiroyuki Shimanaka, Tokyo (JP); Jun Kamabayashi, Tokyo (JP); Sachio Yoshikawa, Tokyo (JP); Toshie Okubo, Tokyo (JP); Lu Tian, Tokyo (JP); and Akifumi Tanaka, Tokyo (JP)
Assigned to Dainischiseika Color & Chemicals Mfg. Co., Ltd., Tokyo (JP)
Appl. No. 18/548,432
Filed by DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Tokyo (JP)
PCT Filed Sep. 16, 2021, PCT No. PCT/JP2021/034091
§ 371(c)(1), (2) Date Aug. 30, 2023,
PCT Pub. No. WO2022/185578, PCT Pub. Date Sep. 9, 2022.
Claims priority of application No. 2021-032900 (JP), filed on Mar. 2, 2021.
Prior Publication US 2024/0101844 A1, Mar. 28, 2024
Int. Cl. C09D 11/326 (2014.01); C09D 11/033 (2014.01)
CPC C09D 11/326 (2013.01) [C09D 11/033 (2013.01)] 10 Claims
 
1. An aqueous pigment dispersion comprising:
a pigment;
water;
a water-soluble organic solvent; and
a polymeric dispersant that disperses the pigment,
wherein the polymeric dispersant is a first polymer
comprising:
a constituent unit (i) derived from at least one material selected from the group consisting of (meth)acrylic acid and itaconic acid, and
a constituent unit (ii) derived from a (meth)acrylate derived from a biological material,
having an acid value in a range from 30 to 250 mgKOH/g,
having a number average molecular weight in a range from 1,000 to 30,000, and
having a polydispersity index (weight average molecular weight/number average molecular weight) in a range of 2.5 or less,
wherein a content of the constituent unit (ii) is in a range of 50% by mass or more relative to the first polymer, and
at least part of carboxy groups of the first polymer are neutralized with an alkali; and
the (meth)acrylate derived from a biological material is at least one material selected from the group consisting of ethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, isobornyl (meth)acrylate, octyl (meth)acrylate, dodecyl (meth)acrylate, and octadecyl (meth)acrylate.