Process for the preparation of perylene pigments

US6403797B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Charles W. Sandefur · Summerville, US
• Brian Thompson · Goose Creek, US
• Michael J. Greene · Lompoc, US
• Gregory R. Schulz · Fairfax, US

Key dates

• Filing date: Dec 22, 2000
• Grant date: Jun 11, 2002
• Expiry date: Dec 22, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0033
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to a process for preparing perylene pigment compositions by(a) reacting, at a temperature of less than about 25° C., a mixture of(1) a perylene tetracarboxylic compound,(2) at least about 0.1% by weight, relative to the perylene tetracarboxylic compound, of a surfactant of formula (I)  wherein R1, R2, R3, X, Y, Z, and Z′ are defined herein,(3) an equivalent excess, relative to the amount of the perylene tetracarboxylic compound, of ammonia or a primary amine RA—NH2, wherein RA is defined herein, and(4) optionally, a solvent, to form a perylene intermediate;(b) heating the perylene intermediate at a temperature of about 50° C. to about 250° C., optionally in the presence of certain non-pigmentary cyclic anhydrides or imides and/or solvents; and(c) collecting the perylene pigment composition.