	US 12,139,615 B2
	Method for producing halogenated zinc phthalocyanine pigment
Keisuke Sakamoto, Sakura (JP); Kentaro Oishi, Sakura (JP); Ryousuke Asami, Sakura (JP); Mayumi Tokuoka, Kamisu (JP); and Katsunori Shimada, Sakura (JP)
Assigned to DIC CORPORATION, Tokyo (JP)
Appl. No. 17/296,656
Filed by DIC Corporation, Tokyo (JP)
PCT Filed Apr. 30, 2020, PCT No. PCT/JP2020/018352 § 371(c)(1), (2) Date May 25, 2021, PCT Pub. No. WO2021/220497, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0144572 A1, May 11, 2023
Int. Cl. C07D 487/22 (2006.01); C09B 47/10 (2006.01); C09B 67/20 (2006.01)

CPC C09B 47/10 (2013.01) [C07D 487/22 (2013.01); C09B 67/0066 (2013.01)]

6 Claims

1. A method for producing a halogenated zinc phthalocyanine pigment from a halogenated zinc phthalocyanine crude pigment, the method comprising:

providing the halogenated zinc phthalocyanine crude pigment synthesized from a compound that generates an acid by reacting with water followed by deposition; and

a pretreatment step of heating the halogenated zinc phthalocyanine crude pigment in water to obtain a halogenated zinc phthalocyanine prepigment having a pH of 5.0 or more.