	US 12,221,546 B2
	Method for producing halogenated zinc phthalocyanine pigment
Keisuke Sakamoto, Sakura (JP); Ayaka Yamaji, Sakura (JP); Nozomi Shimizu, Sakura (JP); Mayumi Tokuoka, Kamisu (JP); and Katsunori Shimada, Sakura (JP)
Assigned to DIC CORPORATION, Tokyo (JP)
Appl. No. 17/296,647
Filed by DIC Corporation, Tokyo (JP)
PCT Filed Apr. 30, 2020, PCT No. PCT/JP2020/018351 § 371(c)(1), (2) Date May 25, 2021, PCT Pub. No. WO2021/220496, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0147454 A1, May 11, 2023
Int. Cl. C09B 47/10 (2006.01); C07D 487/22 (2006.01); C09B 67/20 (2006.01)

CPC C09B 47/10 (2013.01) [C07D 487/22 (2013.01); C09B 67/0061 (2013.01)]

4 Claims

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

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

a pretreatment step of dry-crushing the halogenated zinc phthalocyanine crude pigment without a water-soluble inorganic salt in an attritor to obtain a prepigment; and

washing the prepigment with water, thereby forming the halogenated zinc phthalocyanine pigment.