- Patent Title: Black perylene pigment microparticles, method of producing the same, black pigment composition comprising the same, and method of producing black perylene pigment microparticles having controlled hue and/or chroma
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Application No.: US17606926Application Date: 2019-05-15
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Publication No.: US11834578B2Publication Date: 2023-12-05
- Inventor: Masakazu Enomura , Kazutaka Takeda
- Applicant: M. TECHNIQUE CO., LTD.
- Applicant Address: JP Izumi
- Assignee: M. TECHNIQUE CO., LTD.
- Current Assignee: M. TECHNIQUE CO., LTD.
- Current Assignee Address: JP Izumi
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- International Application: PCT/JP2019/019317 2019.05.15
- International Announcement: WO2020/230293A 2020.11.19
- Date entered country: 2021-10-27
- Main IPC: C09B3/18
- IPC: C09B3/18 ; C09B67/54

Abstract:
The present application provides black perylene pigment microparticles having an average circularity of 0.8 or more which are amorphous; and a method of producing the black perylene pigment microparticles, which comprises a step of mixing a pigment solution in which a black perylene pigment is dissolved and a precipitation solvent for precipitating black perylene pigment microparticles from the pigment solution to form black perylene pigment microparticles, wherein at least one of the pigment solution and the precipitation solvent independently includes a salt of an alkaline earth metal and/or a particle growth inhibitor. The present invention can provide black perylene pigment microparticles having good dispersibility, high concealability and light-shielding property and controlled hue and chroma, and a method of easily producing the same, and the like.
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