IP Library › Granted Patent US 12,480,016
Granted Patent B2
US 12,480,016 · App. 18/547,324 · Granted Nov 25, 2025

Ink kit

Inventors: Hiroyuki Konishi (Osaka, JP); Ryuta Noda (Osaka, JP); Masaki Murakami (Osaka, JP); Masahiro Ueki (Osaka, JP); Satoshi Hirakawa (Osaka, JP)
Assignee: SAKATA INX CORPORATION
C09D11/54C09D11/322C09D11/38
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Quick Facts
Patent No.
US 12,480,016
App. No.
18/547,324
Granted
Nov 25, 2025
Kind
B2
Abstract

An object is to obtain an ink set capable of forming images of excellent image quality even when an acidic atmosphere, arising from use of a volatile acid in a pretreatment solution, is present in the vicinity of ink nozzles, etc. As a solution, an ink set containing a pretreatment solution and an ink composition is provided, wherein: the pretreatment solution contains an organic acid having a boiling point of 120° C. or lower at 1 atmospheric pressure; and the ink composition contains a pigment and an alkali-soluble resin having an acid value of 200 mgKOH/g or higher or crosslinked substance thereof accounting for 1.8% by mass or more in the ink composition, and further contains a water-dispersible resin and water.

Claims (6)

1 . An ink kit for inkjet printing, constituted by a pretreatment solution and an ink composition, wherein:

the pretreatment solution contains an organic acid having a boiling point of 120° C. or lower at 1 atmospheric pressure; and

the ink composition contains an alkali-soluble resin having an acid value of 200 mgKOH/g or higher or crosslinked substance thereof accounting for 1.8% by mass or more in the ink composition, and a pigment, and further contains a water-dispersible resin having an acid value of 20 mgKOH/g or lower by 10.0 to 30.0% by mass in solids content in the ink composition, and water.

2 . The ink kit according to claim 1 , wherein the water-dispersible resin is constituted by an acrylic-based resin and/or styrene acrylic-based resin having an acid value of 15 mgKOH/g or lower.

3 . The ink kit according to claim 1 , made for textile printing.

4 . The ink kit according to claim 1 , wherein the alkali-soluble resin having an acid value of 200 mgKOH/g or higher is such that a ratio, by mass of constituent monomers, of (styrene)/(alkyl ester of radically polymerizable unsaturated carboxylic acid with 8 or more carbon atoms)/((meth)acrylic acid) is (35 to 55)/(25 to 35)/(15 to 35), or that of (alkyl ester of (meth)acrylic acid with fewer than 8 carbon atoms)/(acrylic acid)/(methacrylic acid) is (50 to 70)/(13 to 25)/(15 to 25).

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 22, 2023
From: KONISHI, HIROYUKI; NODA, RYUTA; MURAKAMI, MASAKI; UEKI, MASAHIRO; HIRAKAWA, SATOSHI
To: SAKATA INX CORPORATION
Reel/Frame 064670/0260 →
Priority Claims (1)
JP 2021-026501 · Feb 22, 2021 · national
Continuity (1)
Related Publication 20240124735A1 · Apr 18, 2024
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