	US 12,252,617 B2
	Method for producing halogenated zinc phthalocyanine pigment
Keisuke Sakamoto, Sakura (JP); Ayaka Yamaji, Sakura (JP); Kazushi Suzuki, Sakura (JP); Mayumi Tokuoka, Kamisu (JP); and Katsunori Shimada, Sakura (JP)
Assigned to DIC CORPORATION, Tokyo (JP)
Appl. No. 17/296,639
Filed by DIC Corporation, Tokyo (JP)
PCT Filed Apr. 30, 2020, PCT No. PCT/JP2020/018350 § 371(c)(1), (2) Date May 25, 2021, PCT Pub. No. WO2021/220495, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0141091 A1, May 11, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C09B 47/10 (2006.01)

CPC C09B 47/10 (2013.01)

7 Claims

1. A method for producing a halogenated zinc phthalocyanine pigment from a halogenated zinc phthalocyanine crude pigment with a pH of 4.0 or less, comprising:

a pretreatment step of kneading the halogenated zinc phthalocyanine crude pigment along with water to obtain a halogenated zinc phthalocyanine prepigment having a pH of 5.0 or more; and

a micronizing step of kneading the halogenated zinc phthalocyanine prepigment together with a first inorganic salt and an organic solvent, thereby producing the halogenated zinc phthalocyanine pigment.